FFmpeg  4.0
avcodec.h
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1 /*
2  * copyright (c) 2001 Fabrice Bellard
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
23 
24 /**
25  * @file
26  * @ingroup libavc
27  * Libavcodec external API header
28  */
29 
30 #include <errno.h>
31 #include "libavutil/samplefmt.h"
32 #include "libavutil/attributes.h"
33 #include "libavutil/avutil.h"
34 #include "libavutil/buffer.h"
35 #include "libavutil/cpu.h"
37 #include "libavutil/dict.h"
38 #include "libavutil/frame.h"
39 #include "libavutil/hwcontext.h"
40 #include "libavutil/log.h"
41 #include "libavutil/pixfmt.h"
42 #include "libavutil/rational.h"
43 
44 #include "version.h"
45 
46 /**
47  * @defgroup libavc libavcodec
48  * Encoding/Decoding Library
49  *
50  * @{
51  *
52  * @defgroup lavc_decoding Decoding
53  * @{
54  * @}
55  *
56  * @defgroup lavc_encoding Encoding
57  * @{
58  * @}
59  *
60  * @defgroup lavc_codec Codecs
61  * @{
62  * @defgroup lavc_codec_native Native Codecs
63  * @{
64  * @}
65  * @defgroup lavc_codec_wrappers External library wrappers
66  * @{
67  * @}
68  * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
69  * @{
70  * @}
71  * @}
72  * @defgroup lavc_internal Internal
73  * @{
74  * @}
75  * @}
76  */
77 
78 /**
79  * @ingroup libavc
80  * @defgroup lavc_encdec send/receive encoding and decoding API overview
81  * @{
82  *
83  * The avcodec_send_packet()/avcodec_receive_frame()/avcodec_send_frame()/
84  * avcodec_receive_packet() functions provide an encode/decode API, which
85  * decouples input and output.
86  *
87  * The API is very similar for encoding/decoding and audio/video, and works as
88  * follows:
89  * - Set up and open the AVCodecContext as usual.
90  * - Send valid input:
91  * - For decoding, call avcodec_send_packet() to give the decoder raw
92  * compressed data in an AVPacket.
93  * - For encoding, call avcodec_send_frame() to give the encoder an AVFrame
94  * containing uncompressed audio or video.
95  * In both cases, it is recommended that AVPackets and AVFrames are
96  * refcounted, or libavcodec might have to copy the input data. (libavformat
97  * always returns refcounted AVPackets, and av_frame_get_buffer() allocates
98  * refcounted AVFrames.)
99  * - Receive output in a loop. Periodically call one of the avcodec_receive_*()
100  * functions and process their output:
101  * - For decoding, call avcodec_receive_frame(). On success, it will return
102  * an AVFrame containing uncompressed audio or video data.
103  * - For encoding, call avcodec_receive_packet(). On success, it will return
104  * an AVPacket with a compressed frame.
105  * Repeat this call until it returns AVERROR(EAGAIN) or an error. The
106  * AVERROR(EAGAIN) return value means that new input data is required to
107  * return new output. In this case, continue with sending input. For each
108  * input frame/packet, the codec will typically return 1 output frame/packet,
109  * but it can also be 0 or more than 1.
110  *
111  * At the beginning of decoding or encoding, the codec might accept multiple
112  * input frames/packets without returning a frame, until its internal buffers
113  * are filled. This situation is handled transparently if you follow the steps
114  * outlined above.
115  *
116  * In theory, sending input can result in EAGAIN - this should happen only if
117  * not all output was received. You can use this to structure alternative decode
118  * or encode loops other than the one suggested above. For example, you could
119  * try sending new input on each iteration, and try to receive output if that
120  * returns EAGAIN.
121  *
122  * End of stream situations. These require "flushing" (aka draining) the codec,
123  * as the codec might buffer multiple frames or packets internally for
124  * performance or out of necessity (consider B-frames).
125  * This is handled as follows:
126  * - Instead of valid input, send NULL to the avcodec_send_packet() (decoding)
127  * or avcodec_send_frame() (encoding) functions. This will enter draining
128  * mode.
129  * - Call avcodec_receive_frame() (decoding) or avcodec_receive_packet()
130  * (encoding) in a loop until AVERROR_EOF is returned. The functions will
131  * not return AVERROR(EAGAIN), unless you forgot to enter draining mode.
132  * - Before decoding can be resumed again, the codec has to be reset with
133  * avcodec_flush_buffers().
134  *
135  * Using the API as outlined above is highly recommended. But it is also
136  * possible to call functions outside of this rigid schema. For example, you can
137  * call avcodec_send_packet() repeatedly without calling
138  * avcodec_receive_frame(). In this case, avcodec_send_packet() will succeed
139  * until the codec's internal buffer has been filled up (which is typically of
140  * size 1 per output frame, after initial input), and then reject input with
141  * AVERROR(EAGAIN). Once it starts rejecting input, you have no choice but to
142  * read at least some output.
143  *
144  * Not all codecs will follow a rigid and predictable dataflow; the only
145  * guarantee is that an AVERROR(EAGAIN) return value on a send/receive call on
146  * one end implies that a receive/send call on the other end will succeed, or
147  * at least will not fail with AVERROR(EAGAIN). In general, no codec will
148  * permit unlimited buffering of input or output.
149  *
150  * This API replaces the following legacy functions:
151  * - avcodec_decode_video2() and avcodec_decode_audio4():
152  * Use avcodec_send_packet() to feed input to the decoder, then use
153  * avcodec_receive_frame() to receive decoded frames after each packet.
154  * Unlike with the old video decoding API, multiple frames might result from
155  * a packet. For audio, splitting the input packet into frames by partially
156  * decoding packets becomes transparent to the API user. You never need to
157  * feed an AVPacket to the API twice (unless it is rejected with AVERROR(EAGAIN) - then
158  * no data was read from the packet).
159  * Additionally, sending a flush/draining packet is required only once.
160  * - avcodec_encode_video2()/avcodec_encode_audio2():
161  * Use avcodec_send_frame() to feed input to the encoder, then use
162  * avcodec_receive_packet() to receive encoded packets.
163  * Providing user-allocated buffers for avcodec_receive_packet() is not
164  * possible.
165  * - The new API does not handle subtitles yet.
166  *
167  * Mixing new and old function calls on the same AVCodecContext is not allowed,
168  * and will result in undefined behavior.
169  *
170  * Some codecs might require using the new API; using the old API will return
171  * an error when calling it. All codecs support the new API.
172  *
173  * A codec is not allowed to return AVERROR(EAGAIN) for both sending and receiving. This
174  * would be an invalid state, which could put the codec user into an endless
175  * loop. The API has no concept of time either: it cannot happen that trying to
176  * do avcodec_send_packet() results in AVERROR(EAGAIN), but a repeated call 1 second
177  * later accepts the packet (with no other receive/flush API calls involved).
178  * The API is a strict state machine, and the passage of time is not supposed
179  * to influence it. Some timing-dependent behavior might still be deemed
180  * acceptable in certain cases. But it must never result in both send/receive
181  * returning EAGAIN at the same time at any point. It must also absolutely be
182  * avoided that the current state is "unstable" and can "flip-flop" between
183  * the send/receive APIs allowing progress. For example, it's not allowed that
184  * the codec randomly decides that it actually wants to consume a packet now
185  * instead of returning a frame, after it just returned AVERROR(EAGAIN) on an
186  * avcodec_send_packet() call.
187  * @}
188  */
189 
190 /**
191  * @defgroup lavc_core Core functions/structures.
192  * @ingroup libavc
193  *
194  * Basic definitions, functions for querying libavcodec capabilities,
195  * allocating core structures, etc.
196  * @{
197  */
198 
199 
200 /**
201  * Identify the syntax and semantics of the bitstream.
202  * The principle is roughly:
203  * Two decoders with the same ID can decode the same streams.
204  * Two encoders with the same ID can encode compatible streams.
205  * There may be slight deviations from the principle due to implementation
206  * details.
207  *
208  * If you add a codec ID to this list, add it so that
209  * 1. no value of an existing codec ID changes (that would break ABI),
210  * 2. it is as close as possible to similar codecs
211  *
212  * After adding new codec IDs, do not forget to add an entry to the codec
213  * descriptor list and bump libavcodec minor version.
214  */
215 enum AVCodecID {
217 
218  /* video codecs */
220  AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
355 #define AV_CODEC_ID_IFF_BYTERUN1 AV_CODEC_ID_IFF_ILBM
393 #define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC
412 
449 
450  /* various PCM "codecs" */
451  AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
483 
488 
489  /* various ADPCM codecs */
521 
532 
533  /* AMR */
536 
537  /* RealAudio codecs*/
540 
541  /* various DPCM codecs */
546 
549 
550  /* audio codecs */
551  AV_CODEC_ID_MP2 = 0x15000,
552  AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
569  AV_CODEC_ID_GSM, ///< as in Berlin toast format
581  AV_CODEC_ID_GSM_MS, /* as found in WAV */
619 
640 
641  /* subtitle codecs */
642  AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
645  AV_CODEC_ID_TEXT, ///< raw UTF-8 text
652 
668 
669  /* other specific kind of codecs (generally used for attachments) */
670  AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
671  AV_CODEC_ID_TTF = 0x18000,
672 
673  AV_CODEC_ID_SCTE_35, ///< Contain timestamp estimated through PCR of program stream.
682 
683 
684  AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
685 
686  AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
687  * stream (only used by libavformat) */
688  AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
689  * stream (only used by libavformat) */
690  AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
691  AV_CODEC_ID_WRAPPED_AVFRAME = 0x21001, ///< Passthrough codec, AVFrames wrapped in AVPacket
692 };
693 
694 /**
695  * This struct describes the properties of a single codec described by an
696  * AVCodecID.
697  * @see avcodec_descriptor_get()
698  */
699 typedef struct AVCodecDescriptor {
700  enum AVCodecID id;
702  /**
703  * Name of the codec described by this descriptor. It is non-empty and
704  * unique for each codec descriptor. It should contain alphanumeric
705  * characters and '_' only.
706  */
707  const char *name;
708  /**
709  * A more descriptive name for this codec. May be NULL.
710  */
711  const char *long_name;
712  /**
713  * Codec properties, a combination of AV_CODEC_PROP_* flags.
714  */
715  int props;
716  /**
717  * MIME type(s) associated with the codec.
718  * May be NULL; if not, a NULL-terminated array of MIME types.
719  * The first item is always non-NULL and is the preferred MIME type.
720  */
721  const char *const *mime_types;
722  /**
723  * If non-NULL, an array of profiles recognized for this codec.
724  * Terminated with FF_PROFILE_UNKNOWN.
725  */
726  const struct AVProfile *profiles;
728 
729 /**
730  * Codec uses only intra compression.
731  * Video and audio codecs only.
732  */
733 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
734 /**
735  * Codec supports lossy compression. Audio and video codecs only.
736  * @note a codec may support both lossy and lossless
737  * compression modes
738  */
739 #define AV_CODEC_PROP_LOSSY (1 << 1)
740 /**
741  * Codec supports lossless compression. Audio and video codecs only.
742  */
743 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
744 /**
745  * Codec supports frame reordering. That is, the coded order (the order in which
746  * the encoded packets are output by the encoders / stored / input to the
747  * decoders) may be different from the presentation order of the corresponding
748  * frames.
749  *
750  * For codecs that do not have this property set, PTS and DTS should always be
751  * equal.
752  */
753 #define AV_CODEC_PROP_REORDER (1 << 3)
754 /**
755  * Subtitle codec is bitmap based
756  * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
757  */
758 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
759 /**
760  * Subtitle codec is text based.
761  * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
762  */
763 #define AV_CODEC_PROP_TEXT_SUB (1 << 17)
764 
765 /**
766  * @ingroup lavc_decoding
767  * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
768  * This is mainly needed because some optimized bitstream readers read
769  * 32 or 64 bit at once and could read over the end.<br>
770  * Note: If the first 23 bits of the additional bytes are not 0, then damaged
771  * MPEG bitstreams could cause overread and segfault.
772  */
773 #define AV_INPUT_BUFFER_PADDING_SIZE 64
774 
775 /**
776  * @ingroup lavc_encoding
777  * minimum encoding buffer size
778  * Used to avoid some checks during header writing.
779  */
780 #define AV_INPUT_BUFFER_MIN_SIZE 16384
781 
782 /**
783  * @ingroup lavc_decoding
784  */
786  /* We leave some space between them for extensions (drop some
787  * keyframes for intra-only or drop just some bidir frames). */
788  AVDISCARD_NONE =-16, ///< discard nothing
789  AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
790  AVDISCARD_NONREF = 8, ///< discard all non reference
791  AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
792  AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
793  AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
794  AVDISCARD_ALL = 48, ///< discard all
795 };
796 
807  AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
808 };
809 
810 /**
811  * @ingroup lavc_encoding
812  */
813 typedef struct RcOverride{
816  int qscale; // If this is 0 then quality_factor will be used instead.
818 } RcOverride;
819 
820 /* encoding support
821  These flags can be passed in AVCodecContext.flags before initialization.
822  Note: Not everything is supported yet.
823 */
824 
825 /**
826  * Allow decoders to produce frames with data planes that are not aligned
827  * to CPU requirements (e.g. due to cropping).
828  */
829 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
830 /**
831  * Use fixed qscale.
832  */
833 #define AV_CODEC_FLAG_QSCALE (1 << 1)
834 /**
835  * 4 MV per MB allowed / advanced prediction for H.263.
836  */
837 #define AV_CODEC_FLAG_4MV (1 << 2)
838 /**
839  * Output even those frames that might be corrupted.
840  */
841 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
842 /**
843  * Use qpel MC.
844  */
845 #define AV_CODEC_FLAG_QPEL (1 << 4)
846 /**
847  * Use internal 2pass ratecontrol in first pass mode.
848  */
849 #define AV_CODEC_FLAG_PASS1 (1 << 9)
850 /**
851  * Use internal 2pass ratecontrol in second pass mode.
852  */
853 #define AV_CODEC_FLAG_PASS2 (1 << 10)
854 /**
855  * loop filter.
856  */
857 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
858 /**
859  * Only decode/encode grayscale.
860  */
861 #define AV_CODEC_FLAG_GRAY (1 << 13)
862 /**
863  * error[?] variables will be set during encoding.
864  */
865 #define AV_CODEC_FLAG_PSNR (1 << 15)
866 /**
867  * Input bitstream might be truncated at a random location
868  * instead of only at frame boundaries.
869  */
870 #define AV_CODEC_FLAG_TRUNCATED (1 << 16)
871 /**
872  * Use interlaced DCT.
873  */
874 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
875 /**
876  * Force low delay.
877  */
878 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
879 /**
880  * Place global headers in extradata instead of every keyframe.
881  */
882 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
883 /**
884  * Use only bitexact stuff (except (I)DCT).
885  */
886 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
887 /* Fx : Flag for H.263+ extra options */
888 /**
889  * H.263 advanced intra coding / MPEG-4 AC prediction
890  */
891 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
892 /**
893  * interlaced motion estimation
894  */
895 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
896 #define AV_CODEC_FLAG_CLOSED_GOP (1U << 31)
897 
898 /**
899  * Allow non spec compliant speedup tricks.
900  */
901 #define AV_CODEC_FLAG2_FAST (1 << 0)
902 /**
903  * Skip bitstream encoding.
904  */
905 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
906 /**
907  * Place global headers at every keyframe instead of in extradata.
908  */
909 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
910 
911 /**
912  * timecode is in drop frame format. DEPRECATED!!!!
913  */
914 #define AV_CODEC_FLAG2_DROP_FRAME_TIMECODE (1 << 13)
915 
916 /**
917  * Input bitstream might be truncated at a packet boundaries
918  * instead of only at frame boundaries.
919  */
920 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
921 /**
922  * Discard cropping information from SPS.
923  */
924 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
925 
926 /**
927  * Show all frames before the first keyframe
928  */
929 #define AV_CODEC_FLAG2_SHOW_ALL (1 << 22)
930 /**
931  * Export motion vectors through frame side data
932  */
933 #define AV_CODEC_FLAG2_EXPORT_MVS (1 << 28)
934 /**
935  * Do not skip samples and export skip information as frame side data
936  */
937 #define AV_CODEC_FLAG2_SKIP_MANUAL (1 << 29)
938 /**
939  * Do not reset ASS ReadOrder field on flush (subtitles decoding)
940  */
941 #define AV_CODEC_FLAG2_RO_FLUSH_NOOP (1 << 30)
942 
943 /* Unsupported options :
944  * Syntax Arithmetic coding (SAC)
945  * Reference Picture Selection
946  * Independent Segment Decoding */
947 /* /Fx */
948 /* codec capabilities */
949 
950 /**
951  * Decoder can use draw_horiz_band callback.
952  */
953 #define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0)
954 /**
955  * Codec uses get_buffer() for allocating buffers and supports custom allocators.
956  * If not set, it might not use get_buffer() at all or use operations that
957  * assume the buffer was allocated by avcodec_default_get_buffer.
958  */
959 #define AV_CODEC_CAP_DR1 (1 << 1)
960 #define AV_CODEC_CAP_TRUNCATED (1 << 3)
961 /**
962  * Encoder or decoder requires flushing with NULL input at the end in order to
963  * give the complete and correct output.
964  *
965  * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
966  * with NULL data. The user can still send NULL data to the public encode
967  * or decode function, but libavcodec will not pass it along to the codec
968  * unless this flag is set.
969  *
970  * Decoders:
971  * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
972  * avpkt->size=0 at the end to get the delayed data until the decoder no longer
973  * returns frames.
974  *
975  * Encoders:
976  * The encoder needs to be fed with NULL data at the end of encoding until the
977  * encoder no longer returns data.
978  *
979  * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
980  * flag also means that the encoder must set the pts and duration for
981  * each output packet. If this flag is not set, the pts and duration will
982  * be determined by libavcodec from the input frame.
983  */
984 #define AV_CODEC_CAP_DELAY (1 << 5)
985 /**
986  * Codec can be fed a final frame with a smaller size.
987  * This can be used to prevent truncation of the last audio samples.
988  */
989 #define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)
990 
991 /**
992  * Codec can output multiple frames per AVPacket
993  * Normally demuxers return one frame at a time, demuxers which do not do
994  * are connected to a parser to split what they return into proper frames.
995  * This flag is reserved to the very rare category of codecs which have a
996  * bitstream that cannot be split into frames without timeconsuming
997  * operations like full decoding. Demuxers carrying such bitstreams thus
998  * may return multiple frames in a packet. This has many disadvantages like
999  * prohibiting stream copy in many cases thus it should only be considered
1000  * as a last resort.
1001  */
1002 #define AV_CODEC_CAP_SUBFRAMES (1 << 8)
1003 /**
1004  * Codec is experimental and is thus avoided in favor of non experimental
1005  * encoders
1006  */
1007 #define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)
1008 /**
1009  * Codec should fill in channel configuration and samplerate instead of container
1010  */
1011 #define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)
1012 /**
1013  * Codec supports frame-level multithreading.
1014  */
1015 #define AV_CODEC_CAP_FRAME_THREADS (1 << 12)
1016 /**
1017  * Codec supports slice-based (or partition-based) multithreading.
1018  */
1019 #define AV_CODEC_CAP_SLICE_THREADS (1 << 13)
1020 /**
1021  * Codec supports changed parameters at any point.
1022  */
1023 #define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)
1024 /**
1025  * Codec supports avctx->thread_count == 0 (auto).
1026  */
1027 #define AV_CODEC_CAP_AUTO_THREADS (1 << 15)
1028 /**
1029  * Audio encoder supports receiving a different number of samples in each call.
1030  */
1031 #define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)
1032 /**
1033  * Decoder is not a preferred choice for probing.
1034  * This indicates that the decoder is not a good choice for probing.
1035  * It could for example be an expensive to spin up hardware decoder,
1036  * or it could simply not provide a lot of useful information about
1037  * the stream.
1038  * A decoder marked with this flag should only be used as last resort
1039  * choice for probing.
1040  */
1041 #define AV_CODEC_CAP_AVOID_PROBING (1 << 17)
1042 /**
1043  * Codec is intra only.
1044  */
1045 #define AV_CODEC_CAP_INTRA_ONLY 0x40000000
1046 /**
1047  * Codec is lossless.
1048  */
1049 #define AV_CODEC_CAP_LOSSLESS 0x80000000
1050 
1051 /**
1052  * Codec is backed by a hardware implementation. Typically used to
1053  * identify a non-hwaccel hardware decoder. For information about hwaccels, use
1054  * avcodec_get_hw_config() instead.
1055  */
1056 #define AV_CODEC_CAP_HARDWARE (1 << 18)
1057 
1058 /**
1059  * Codec is potentially backed by a hardware implementation, but not
1060  * necessarily. This is used instead of AV_CODEC_CAP_HARDWARE, if the
1061  * implementation provides some sort of internal fallback.
1062  */
1063 #define AV_CODEC_CAP_HYBRID (1 << 19)
1064 
1065 /**
1066  * Pan Scan area.
1067  * This specifies the area which should be displayed.
1068  * Note there may be multiple such areas for one frame.
1069  */
1070 typedef struct AVPanScan {
1071  /**
1072  * id
1073  * - encoding: Set by user.
1074  * - decoding: Set by libavcodec.
1075  */
1076  int id;
1077 
1078  /**
1079  * width and height in 1/16 pel
1080  * - encoding: Set by user.
1081  * - decoding: Set by libavcodec.
1082  */
1083  int width;
1084  int height;
1085 
1086  /**
1087  * position of the top left corner in 1/16 pel for up to 3 fields/frames
1088  * - encoding: Set by user.
1089  * - decoding: Set by libavcodec.
1090  */
1091  int16_t position[3][2];
1092 } AVPanScan;
1093 
1094 /**
1095  * This structure describes the bitrate properties of an encoded bitstream. It
1096  * roughly corresponds to a subset the VBV parameters for MPEG-2 or HRD
1097  * parameters for H.264/HEVC.
1098  */
1099 typedef struct AVCPBProperties {
1100  /**
1101  * Maximum bitrate of the stream, in bits per second.
1102  * Zero if unknown or unspecified.
1103  */
1105  /**
1106  * Minimum bitrate of the stream, in bits per second.
1107  * Zero if unknown or unspecified.
1108  */
1110  /**
1111  * Average bitrate of the stream, in bits per second.
1112  * Zero if unknown or unspecified.
1113  */
1115 
1116  /**
1117  * The size of the buffer to which the ratecontrol is applied, in bits.
1118  * Zero if unknown or unspecified.
1119  */
1121 
1122  /**
1123  * The delay between the time the packet this structure is associated with
1124  * is received and the time when it should be decoded, in periods of a 27MHz
1125  * clock.
1126  *
1127  * UINT64_MAX when unknown or unspecified.
1128  */
1129  uint64_t vbv_delay;
1130 } AVCPBProperties;
1131 
1132 /**
1133  * The decoder will keep a reference to the frame and may reuse it later.
1134  */
1135 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
1136 
1137 /**
1138  * @defgroup lavc_packet AVPacket
1139  *
1140  * Types and functions for working with AVPacket.
1141  * @{
1142  */
1144  /**
1145  * An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE
1146  * bytes worth of palette. This side data signals that a new palette is
1147  * present.
1148  */
1150 
1151  /**
1152  * The AV_PKT_DATA_NEW_EXTRADATA is used to notify the codec or the format
1153  * that the extradata buffer was changed and the receiving side should
1154  * act upon it appropriately. The new extradata is embedded in the side
1155  * data buffer and should be immediately used for processing the current
1156  * frame or packet.
1157  */
1159 
1160  /**
1161  * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
1162  * @code
1163  * u32le param_flags
1164  * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
1165  * s32le channel_count
1166  * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
1167  * u64le channel_layout
1168  * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
1169  * s32le sample_rate
1170  * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
1171  * s32le width
1172  * s32le height
1173  * @endcode
1174  */
1176 
1177  /**
1178  * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1179  * structures with info about macroblocks relevant to splitting the
1180  * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1181  * That is, it does not necessarily contain info about all macroblocks,
1182  * as long as the distance between macroblocks in the info is smaller
1183  * than the target payload size.
1184  * Each MB info structure is 12 bytes, and is laid out as follows:
1185  * @code
1186  * u32le bit offset from the start of the packet
1187  * u8 current quantizer at the start of the macroblock
1188  * u8 GOB number
1189  * u16le macroblock address within the GOB
1190  * u8 horizontal MV predictor
1191  * u8 vertical MV predictor
1192  * u8 horizontal MV predictor for block number 3
1193  * u8 vertical MV predictor for block number 3
1194  * @endcode
1195  */
1197 
1198  /**
1199  * This side data should be associated with an audio stream and contains
1200  * ReplayGain information in form of the AVReplayGain struct.
1201  */
1203 
1204  /**
1205  * This side data contains a 3x3 transformation matrix describing an affine
1206  * transformation that needs to be applied to the decoded video frames for
1207  * correct presentation.
1208  *
1209  * See libavutil/display.h for a detailed description of the data.
1210  */
1212 
1213  /**
1214  * This side data should be associated with a video stream and contains
1215  * Stereoscopic 3D information in form of the AVStereo3D struct.
1216  */
1218 
1219  /**
1220  * This side data should be associated with an audio stream and corresponds
1221  * to enum AVAudioServiceType.
1222  */
1224 
1225  /**
1226  * This side data contains quality related information from the encoder.
1227  * @code
1228  * u32le quality factor of the compressed frame. Allowed range is between 1 (good) and FF_LAMBDA_MAX (bad).
1229  * u8 picture type
1230  * u8 error count
1231  * u16 reserved
1232  * u64le[error count] sum of squared differences between encoder in and output
1233  * @endcode
1234  */
1236 
1237  /**
1238  * This side data contains an integer value representing the stream index
1239  * of a "fallback" track. A fallback track indicates an alternate
1240  * track to use when the current track can not be decoded for some reason.
1241  * e.g. no decoder available for codec.
1242  */
1244 
1245  /**
1246  * This side data corresponds to the AVCPBProperties struct.
1247  */
1249 
1250  /**
1251  * Recommmends skipping the specified number of samples
1252  * @code
1253  * u32le number of samples to skip from start of this packet
1254  * u32le number of samples to skip from end of this packet
1255  * u8 reason for start skip
1256  * u8 reason for end skip (0=padding silence, 1=convergence)
1257  * @endcode
1258  */
1260 
1261  /**
1262  * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
1263  * the packet may contain "dual mono" audio specific to Japanese DTV
1264  * and if it is true, recommends only the selected channel to be used.
1265  * @code
1266  * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
1267  * @endcode
1268  */
1270 
1271  /**
1272  * A list of zero terminated key/value strings. There is no end marker for
1273  * the list, so it is required to rely on the side data size to stop.
1274  */
1276 
1277  /**
1278  * Subtitle event position
1279  * @code
1280  * u32le x1
1281  * u32le y1
1282  * u32le x2
1283  * u32le y2
1284  * @endcode
1285  */
1287 
1288  /**
1289  * Data found in BlockAdditional element of matroska container. There is
1290  * no end marker for the data, so it is required to rely on the side data
1291  * size to recognize the end. 8 byte id (as found in BlockAddId) followed
1292  * by data.
1293  */
1295 
1296  /**
1297  * The optional first identifier line of a WebVTT cue.
1298  */
1300 
1301  /**
1302  * The optional settings (rendering instructions) that immediately
1303  * follow the timestamp specifier of a WebVTT cue.
1304  */
1306 
1307  /**
1308  * A list of zero terminated key/value strings. There is no end marker for
1309  * the list, so it is required to rely on the side data size to stop. This
1310  * side data includes updated metadata which appeared in the stream.
1311  */
1313 
1314  /**
1315  * MPEGTS stream ID, this is required to pass the stream ID
1316  * information from the demuxer to the corresponding muxer.
1317  */
1319 
1320  /**
1321  * Mastering display metadata (based on SMPTE-2086:2014). This metadata
1322  * should be associated with a video stream and contains data in the form
1323  * of the AVMasteringDisplayMetadata struct.
1324  */
1326 
1327  /**
1328  * This side data should be associated with a video stream and corresponds
1329  * to the AVSphericalMapping structure.
1330  */
1332 
1333  /**
1334  * Content light level (based on CTA-861.3). This metadata should be
1335  * associated with a video stream and contains data in the form of the
1336  * AVContentLightMetadata struct.
1337  */
1339 
1340  /**
1341  * ATSC A53 Part 4 Closed Captions. This metadata should be associated with
1342  * a video stream. A53 CC bitstream is stored as uint8_t in AVPacketSideData.data.
1343  * The number of bytes of CC data is AVPacketSideData.size.
1344  */
1346 
1347  /**
1348  * This side data is encryption initialization data.
1349  * The format is not part of ABI, use av_encryption_init_info_* methods to
1350  * access.
1351  */
1353 
1354  /**
1355  * This side data contains encryption info for how to decrypt the packet.
1356  * The format is not part of ABI, use av_encryption_info_* methods to access.
1357  */
1359 
1360  /**
1361  * The number of side data types.
1362  * This is not part of the public API/ABI in the sense that it may
1363  * change when new side data types are added.
1364  * This must stay the last enum value.
1365  * If its value becomes huge, some code using it
1366  * needs to be updated as it assumes it to be smaller than other limits.
1367  */
1369 };
1370 
1371 #define AV_PKT_DATA_QUALITY_FACTOR AV_PKT_DATA_QUALITY_STATS //DEPRECATED
1372 
1373 typedef struct AVPacketSideData {
1375  int size;
1378 
1379 /**
1380  * This structure stores compressed data. It is typically exported by demuxers
1381  * and then passed as input to decoders, or received as output from encoders and
1382  * then passed to muxers.
1383  *
1384  * For video, it should typically contain one compressed frame. For audio it may
1385  * contain several compressed frames. Encoders are allowed to output empty
1386  * packets, with no compressed data, containing only side data
1387  * (e.g. to update some stream parameters at the end of encoding).
1388  *
1389  * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1390  * ABI. Thus it may be allocated on stack and no new fields can be added to it
1391  * without libavcodec and libavformat major bump.
1392  *
1393  * The semantics of data ownership depends on the buf field.
1394  * If it is set, the packet data is dynamically allocated and is
1395  * valid indefinitely until a call to av_packet_unref() reduces the
1396  * reference count to 0.
1397  *
1398  * If the buf field is not set av_packet_ref() would make a copy instead
1399  * of increasing the reference count.
1400  *
1401  * The side data is always allocated with av_malloc(), copied by
1402  * av_packet_ref() and freed by av_packet_unref().
1403  *
1404  * @see av_packet_ref
1405  * @see av_packet_unref
1406  */
1407 typedef struct AVPacket {
1408  /**
1409  * A reference to the reference-counted buffer where the packet data is
1410  * stored.
1411  * May be NULL, then the packet data is not reference-counted.
1412  */
1414  /**
1415  * Presentation timestamp in AVStream->time_base units; the time at which
1416  * the decompressed packet will be presented to the user.
1417  * Can be AV_NOPTS_VALUE if it is not stored in the file.
1418  * pts MUST be larger or equal to dts as presentation cannot happen before
1419  * decompression, unless one wants to view hex dumps. Some formats misuse
1420  * the terms dts and pts/cts to mean something different. Such timestamps
1421  * must be converted to true pts/dts before they are stored in AVPacket.
1422  */
1423  int64_t pts;
1424  /**
1425  * Decompression timestamp in AVStream->time_base units; the time at which
1426  * the packet is decompressed.
1427  * Can be AV_NOPTS_VALUE if it is not stored in the file.
1428  */
1429  int64_t dts;
1431  int size;
1433  /**
1434  * A combination of AV_PKT_FLAG values
1435  */
1436  int flags;
1437  /**
1438  * Additional packet data that can be provided by the container.
1439  * Packet can contain several types of side information.
1440  */
1443 
1444  /**
1445  * Duration of this packet in AVStream->time_base units, 0 if unknown.
1446  * Equals next_pts - this_pts in presentation order.
1447  */
1448  int64_t duration;
1449 
1450  int64_t pos; ///< byte position in stream, -1 if unknown
1451 
1452 #if FF_API_CONVERGENCE_DURATION
1453  /**
1454  * @deprecated Same as the duration field, but as int64_t. This was required
1455  * for Matroska subtitles, whose duration values could overflow when the
1456  * duration field was still an int.
1457  */
1460 #endif
1461 } AVPacket;
1462 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1463 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1464 /**
1465  * Flag is used to discard packets which are required to maintain valid
1466  * decoder state but are not required for output and should be dropped
1467  * after decoding.
1468  **/
1469 #define AV_PKT_FLAG_DISCARD 0x0004
1470 /**
1471  * The packet comes from a trusted source.
1472  *
1473  * Otherwise-unsafe constructs such as arbitrary pointers to data
1474  * outside the packet may be followed.
1475  */
1476 #define AV_PKT_FLAG_TRUSTED 0x0008
1477 /**
1478  * Flag is used to indicate packets that contain frames that can
1479  * be discarded by the decoder. I.e. Non-reference frames.
1480  */
1481 #define AV_PKT_FLAG_DISPOSABLE 0x0010
1482 
1483 
1489 };
1490 /**
1491  * @}
1492  */
1493 
1494 struct AVCodecInternal;
1495 
1499  AV_FIELD_TT, //< Top coded_first, top displayed first
1500  AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1501  AV_FIELD_TB, //< Top coded first, bottom displayed first
1502  AV_FIELD_BT, //< Bottom coded first, top displayed first
1503 };
1504 
1505 /**
1506  * main external API structure.
1507  * New fields can be added to the end with minor version bumps.
1508  * Removal, reordering and changes to existing fields require a major
1509  * version bump.
1510  * You can use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1511  * applications.
1512  * The name string for AVOptions options matches the associated command line
1513  * parameter name and can be found in libavcodec/options_table.h
1514  * The AVOption/command line parameter names differ in some cases from the C
1515  * structure field names for historic reasons or brevity.
1516  * sizeof(AVCodecContext) must not be used outside libav*.
1517  */
1518 typedef struct AVCodecContext {
1519  /**
1520  * information on struct for av_log
1521  * - set by avcodec_alloc_context3
1522  */
1525 
1526  enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1527  const struct AVCodec *codec;
1528  enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1529 
1530  /**
1531  * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1532  * This is used to work around some encoder bugs.
1533  * A demuxer should set this to what is stored in the field used to identify the codec.
1534  * If there are multiple such fields in a container then the demuxer should choose the one
1535  * which maximizes the information about the used codec.
1536  * If the codec tag field in a container is larger than 32 bits then the demuxer should
1537  * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1538  * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1539  * first.
1540  * - encoding: Set by user, if not then the default based on codec_id will be used.
1541  * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1542  */
1543  unsigned int codec_tag;
1544 
1545  void *priv_data;
1546 
1547  /**
1548  * Private context used for internal data.
1549  *
1550  * Unlike priv_data, this is not codec-specific. It is used in general
1551  * libavcodec functions.
1552  */
1553  struct AVCodecInternal *internal;
1554 
1555  /**
1556  * Private data of the user, can be used to carry app specific stuff.
1557  * - encoding: Set by user.
1558  * - decoding: Set by user.
1559  */
1560  void *opaque;
1561 
1562  /**
1563  * the average bitrate
1564  * - encoding: Set by user; unused for constant quantizer encoding.
1565  * - decoding: Set by user, may be overwritten by libavcodec
1566  * if this info is available in the stream
1567  */
1568  int64_t bit_rate;
1569 
1570  /**
1571  * number of bits the bitstream is allowed to diverge from the reference.
1572  * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1573  * - encoding: Set by user; unused for constant quantizer encoding.
1574  * - decoding: unused
1575  */
1577 
1578  /**
1579  * Global quality for codecs which cannot change it per frame.
1580  * This should be proportional to MPEG-1/2/4 qscale.
1581  * - encoding: Set by user.
1582  * - decoding: unused
1583  */
1585 
1586  /**
1587  * - encoding: Set by user.
1588  * - decoding: unused
1589  */
1591 #define FF_COMPRESSION_DEFAULT -1
1592 
1593  /**
1594  * AV_CODEC_FLAG_*.
1595  * - encoding: Set by user.
1596  * - decoding: Set by user.
1597  */
1598  int flags;
1599 
1600  /**
1601  * AV_CODEC_FLAG2_*
1602  * - encoding: Set by user.
1603  * - decoding: Set by user.
1604  */
1605  int flags2;
1606 
1607  /**
1608  * some codecs need / can use extradata like Huffman tables.
1609  * MJPEG: Huffman tables
1610  * rv10: additional flags
1611  * MPEG-4: global headers (they can be in the bitstream or here)
1612  * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
1613  * than extradata_size to avoid problems if it is read with the bitstream reader.
1614  * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1615  * - encoding: Set/allocated/freed by libavcodec.
1616  * - decoding: Set/allocated/freed by user.
1617  */
1620 
1621  /**
1622  * This is the fundamental unit of time (in seconds) in terms
1623  * of which frame timestamps are represented. For fixed-fps content,
1624  * timebase should be 1/framerate and timestamp increments should be
1625  * identically 1.
1626  * This often, but not always is the inverse of the frame rate or field rate
1627  * for video. 1/time_base is not the average frame rate if the frame rate is not
1628  * constant.
1629  *
1630  * Like containers, elementary streams also can store timestamps, 1/time_base
1631  * is the unit in which these timestamps are specified.
1632  * As example of such codec time base see ISO/IEC 14496-2:2001(E)
1633  * vop_time_increment_resolution and fixed_vop_rate
1634  * (fixed_vop_rate == 0 implies that it is different from the framerate)
1635  *
1636  * - encoding: MUST be set by user.
1637  * - decoding: the use of this field for decoding is deprecated.
1638  * Use framerate instead.
1639  */
1641 
1642  /**
1643  * For some codecs, the time base is closer to the field rate than the frame rate.
1644  * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1645  * if no telecine is used ...
1646  *
1647  * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1648  */
1650 
1651  /**
1652  * Codec delay.
1653  *
1654  * Encoding: Number of frames delay there will be from the encoder input to
1655  * the decoder output. (we assume the decoder matches the spec)
1656  * Decoding: Number of frames delay in addition to what a standard decoder
1657  * as specified in the spec would produce.
1658  *
1659  * Video:
1660  * Number of frames the decoded output will be delayed relative to the
1661  * encoded input.
1662  *
1663  * Audio:
1664  * For encoding, this field is unused (see initial_padding).
1665  *
1666  * For decoding, this is the number of samples the decoder needs to
1667  * output before the decoder's output is valid. When seeking, you should
1668  * start decoding this many samples prior to your desired seek point.
1669  *
1670  * - encoding: Set by libavcodec.
1671  * - decoding: Set by libavcodec.
1672  */
1673  int delay;
1674 
1675 
1676  /* video only */
1677  /**
1678  * picture width / height.
1679  *
1680  * @note Those fields may not match the values of the last
1681  * AVFrame output by avcodec_decode_video2 due frame
1682  * reordering.
1683  *
1684  * - encoding: MUST be set by user.
1685  * - decoding: May be set by the user before opening the decoder if known e.g.
1686  * from the container. Some decoders will require the dimensions
1687  * to be set by the caller. During decoding, the decoder may
1688  * overwrite those values as required while parsing the data.
1689  */
1691 
1692  /**
1693  * Bitstream width / height, may be different from width/height e.g. when
1694  * the decoded frame is cropped before being output or lowres is enabled.
1695  *
1696  * @note Those field may not match the value of the last
1697  * AVFrame output by avcodec_receive_frame() due frame
1698  * reordering.
1699  *
1700  * - encoding: unused
1701  * - decoding: May be set by the user before opening the decoder if known
1702  * e.g. from the container. During decoding, the decoder may
1703  * overwrite those values as required while parsing the data.
1704  */
1705  int coded_width, coded_height;
1706 
1707  /**
1708  * the number of pictures in a group of pictures, or 0 for intra_only
1709  * - encoding: Set by user.
1710  * - decoding: unused
1711  */
1713 
1714  /**
1715  * Pixel format, see AV_PIX_FMT_xxx.
1716  * May be set by the demuxer if known from headers.
1717  * May be overridden by the decoder if it knows better.
1718  *
1719  * @note This field may not match the value of the last
1720  * AVFrame output by avcodec_receive_frame() due frame
1721  * reordering.
1722  *
1723  * - encoding: Set by user.
1724  * - decoding: Set by user if known, overridden by libavcodec while
1725  * parsing the data.
1726  */
1728 
1729  /**
1730  * If non NULL, 'draw_horiz_band' is called by the libavcodec
1731  * decoder to draw a horizontal band. It improves cache usage. Not
1732  * all codecs can do that. You must check the codec capabilities
1733  * beforehand.
1734  * When multithreading is used, it may be called from multiple threads
1735  * at the same time; threads might draw different parts of the same AVFrame,
1736  * or multiple AVFrames, and there is no guarantee that slices will be drawn
1737  * in order.
1738  * The function is also used by hardware acceleration APIs.
1739  * It is called at least once during frame decoding to pass
1740  * the data needed for hardware render.
1741  * In that mode instead of pixel data, AVFrame points to
1742  * a structure specific to the acceleration API. The application
1743  * reads the structure and can change some fields to indicate progress
1744  * or mark state.
1745  * - encoding: unused
1746  * - decoding: Set by user.
1747  * @param height the height of the slice
1748  * @param y the y position of the slice
1749  * @param type 1->top field, 2->bottom field, 3->frame
1750  * @param offset offset into the AVFrame.data from which the slice should be read
1751  */
1753  const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1754  int y, int type, int height);
1755 
1756  /**
1757  * callback to negotiate the pixelFormat
1758  * @param fmt is the list of formats which are supported by the codec,
1759  * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1760  * The first is always the native one.
1761  * @note The callback may be called again immediately if initialization for
1762  * the selected (hardware-accelerated) pixel format failed.
1763  * @warning Behavior is undefined if the callback returns a value not
1764  * in the fmt list of formats.
1765  * @return the chosen format
1766  * - encoding: unused
1767  * - decoding: Set by user, if not set the native format will be chosen.
1768  */
1769  enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1770 
1771  /**
1772  * maximum number of B-frames between non-B-frames
1773  * Note: The output will be delayed by max_b_frames+1 relative to the input.
1774  * - encoding: Set by user.
1775  * - decoding: unused
1776  */
1778 
1779  /**
1780  * qscale factor between IP and B-frames
1781  * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1782  * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1783  * - encoding: Set by user.
1784  * - decoding: unused
1785  */
1787 
1788 #if FF_API_PRIVATE_OPT
1789  /** @deprecated use encoder private options instead */
1792 #endif
1793 
1794  /**
1795  * qscale offset between IP and B-frames
1796  * - encoding: Set by user.
1797  * - decoding: unused
1798  */
1800 
1801  /**
1802  * Size of the frame reordering buffer in the decoder.
1803  * For MPEG-2 it is 1 IPB or 0 low delay IP.
1804  * - encoding: Set by libavcodec.
1805  * - decoding: Set by libavcodec.
1806  */
1808 
1809 #if FF_API_PRIVATE_OPT
1810  /** @deprecated use encoder private options instead */
1813 #endif
1814 
1815  /**
1816  * qscale factor between P- and I-frames
1817  * If > 0 then the last P-frame quantizer will be used (q = lastp_q * factor + offset).
1818  * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1819  * - encoding: Set by user.
1820  * - decoding: unused
1821  */
1823 
1824  /**
1825  * qscale offset between P and I-frames
1826  * - encoding: Set by user.
1827  * - decoding: unused
1828  */
1830 
1831  /**
1832  * luminance masking (0-> disabled)
1833  * - encoding: Set by user.
1834  * - decoding: unused
1835  */
1837 
1838  /**
1839  * temporary complexity masking (0-> disabled)
1840  * - encoding: Set by user.
1841  * - decoding: unused
1842  */
1844 
1845  /**
1846  * spatial complexity masking (0-> disabled)
1847  * - encoding: Set by user.
1848  * - decoding: unused
1849  */
1851 
1852  /**
1853  * p block masking (0-> disabled)
1854  * - encoding: Set by user.
1855  * - decoding: unused
1856  */
1857  float p_masking;
1858 
1859  /**
1860  * darkness masking (0-> disabled)
1861  * - encoding: Set by user.
1862  * - decoding: unused
1863  */
1865 
1866  /**
1867  * slice count
1868  * - encoding: Set by libavcodec.
1869  * - decoding: Set by user (or 0).
1870  */
1872 
1873 #if FF_API_PRIVATE_OPT
1874  /** @deprecated use encoder private options instead */
1877 #define FF_PRED_LEFT 0
1878 #define FF_PRED_PLANE 1
1879 #define FF_PRED_MEDIAN 2
1880 #endif
1881 
1882  /**
1883  * slice offsets in the frame in bytes
1884  * - encoding: Set/allocated by libavcodec.
1885  * - decoding: Set/allocated by user (or NULL).
1886  */
1888 
1889  /**
1890  * sample aspect ratio (0 if unknown)
1891  * That is the width of a pixel divided by the height of the pixel.
1892  * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1893  * - encoding: Set by user.
1894  * - decoding: Set by libavcodec.
1895  */
1897 
1898  /**
1899  * motion estimation comparison function
1900  * - encoding: Set by user.
1901  * - decoding: unused
1902  */
1903  int me_cmp;
1904  /**
1905  * subpixel motion estimation comparison function
1906  * - encoding: Set by user.
1907  * - decoding: unused
1908  */
1910  /**
1911  * macroblock comparison function (not supported yet)
1912  * - encoding: Set by user.
1913  * - decoding: unused
1914  */
1915  int mb_cmp;
1916  /**
1917  * interlaced DCT comparison function
1918  * - encoding: Set by user.
1919  * - decoding: unused
1920  */
1922 #define FF_CMP_SAD 0
1923 #define FF_CMP_SSE 1
1924 #define FF_CMP_SATD 2
1925 #define FF_CMP_DCT 3
1926 #define FF_CMP_PSNR 4
1927 #define FF_CMP_BIT 5
1928 #define FF_CMP_RD 6
1929 #define FF_CMP_ZERO 7
1930 #define FF_CMP_VSAD 8
1931 #define FF_CMP_VSSE 9
1932 #define FF_CMP_NSSE 10
1933 #define FF_CMP_W53 11
1934 #define FF_CMP_W97 12
1935 #define FF_CMP_DCTMAX 13
1936 #define FF_CMP_DCT264 14
1937 #define FF_CMP_MEDIAN_SAD 15
1938 #define FF_CMP_CHROMA 256
1939 
1940  /**
1941  * ME diamond size & shape
1942  * - encoding: Set by user.
1943  * - decoding: unused
1944  */
1946 
1947  /**
1948  * amount of previous MV predictors (2a+1 x 2a+1 square)
1949  * - encoding: Set by user.
1950  * - decoding: unused
1951  */
1953 
1954 #if FF_API_PRIVATE_OPT
1955  /** @deprecated use encoder private options instead */
1957  int pre_me;
1958 #endif
1959 
1960  /**
1961  * motion estimation prepass comparison function
1962  * - encoding: Set by user.
1963  * - decoding: unused
1964  */
1966 
1967  /**
1968  * ME prepass diamond size & shape
1969  * - encoding: Set by user.
1970  * - decoding: unused
1971  */
1973 
1974  /**
1975  * subpel ME quality
1976  * - encoding: Set by user.
1977  * - decoding: unused
1978  */
1980 
1981  /**
1982  * maximum motion estimation search range in subpel units
1983  * If 0 then no limit.
1984  *
1985  * - encoding: Set by user.
1986  * - decoding: unused
1987  */
1989 
1990  /**
1991  * slice flags
1992  * - encoding: unused
1993  * - decoding: Set by user.
1994  */
1996 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1997 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG-2 field pics)
1998 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1999 
2000  /**
2001  * macroblock decision mode
2002  * - encoding: Set by user.
2003  * - decoding: unused
2004  */
2006 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2007 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2008 #define FF_MB_DECISION_RD 2 ///< rate distortion
2009 
2010  /**
2011  * custom intra quantization matrix
2012  * - encoding: Set by user, can be NULL.
2013  * - decoding: Set by libavcodec.
2014  */
2015  uint16_t *intra_matrix;
2016 
2017  /**
2018  * custom inter quantization matrix
2019  * - encoding: Set by user, can be NULL.
2020  * - decoding: Set by libavcodec.
2021  */
2022  uint16_t *inter_matrix;
2023 
2024 #if FF_API_PRIVATE_OPT
2025  /** @deprecated use encoder private options instead */
2028 
2029  /** @deprecated use encoder private options instead */
2032 #endif
2033 
2034  /**
2035  * precision of the intra DC coefficient - 8
2036  * - encoding: Set by user.
2037  * - decoding: Set by libavcodec
2038  */
2040 
2041  /**
2042  * Number of macroblock rows at the top which are skipped.
2043  * - encoding: unused
2044  * - decoding: Set by user.
2045  */
2047 
2048  /**
2049  * Number of macroblock rows at the bottom which are skipped.
2050  * - encoding: unused
2051  * - decoding: Set by user.
2052  */
2054 
2055  /**
2056  * minimum MB Lagrange multiplier
2057  * - encoding: Set by user.
2058  * - decoding: unused
2059  */
2060  int mb_lmin;
2061 
2062  /**
2063  * maximum MB Lagrange multiplier
2064  * - encoding: Set by user.
2065  * - decoding: unused
2066  */
2067  int mb_lmax;
2068 
2069 #if FF_API_PRIVATE_OPT
2070  /**
2071  * @deprecated use encoder private options instead
2072  */
2075 #endif
2076 
2077  /**
2078  * - encoding: Set by user.
2079  * - decoding: unused
2080  */
2082 
2083 #if FF_API_PRIVATE_OPT
2084  /** @deprecated use encoder private options instead */
2087 #endif
2088 
2089  /**
2090  * minimum GOP size
2091  * - encoding: Set by user.
2092  * - decoding: unused
2093  */
2095 
2096  /**
2097  * number of reference frames
2098  * - encoding: Set by user.
2099  * - decoding: Set by lavc.
2100  */
2101  int refs;
2102 
2103 #if FF_API_PRIVATE_OPT
2104  /** @deprecated use encoder private options instead */
2107 #endif
2108 
2109  /**
2110  * Note: Value depends upon the compare function used for fullpel ME.
2111  * - encoding: Set by user.
2112  * - decoding: unused
2113  */
2115 
2116 #if FF_API_PRIVATE_OPT
2117  /** @deprecated use encoder private options instead */
2120 #endif
2121 
2122  /**
2123  * Chromaticity coordinates of the source primaries.
2124  * - encoding: Set by user
2125  * - decoding: Set by libavcodec
2126  */
2128 
2129  /**
2130  * Color Transfer Characteristic.
2131  * - encoding: Set by user
2132  * - decoding: Set by libavcodec
2133  */
2135 
2136  /**
2137  * YUV colorspace type.
2138  * - encoding: Set by user
2139  * - decoding: Set by libavcodec
2140  */
2142 
2143  /**
2144  * MPEG vs JPEG YUV range.
2145  * - encoding: Set by user
2146  * - decoding: Set by libavcodec
2147  */
2149 
2150  /**
2151  * This defines the location of chroma samples.
2152  * - encoding: Set by user
2153  * - decoding: Set by libavcodec
2154  */
2156 
2157  /**
2158  * Number of slices.
2159  * Indicates number of picture subdivisions. Used for parallelized
2160  * decoding.
2161  * - encoding: Set by user
2162  * - decoding: unused
2163  */
2164  int slices;
2165 
2166  /** Field order
2167  * - encoding: set by libavcodec
2168  * - decoding: Set by user.
2169  */
2171 
2172  /* audio only */
2173  int sample_rate; ///< samples per second
2174  int channels; ///< number of audio channels
2175 
2176  /**
2177  * audio sample format
2178  * - encoding: Set by user.
2179  * - decoding: Set by libavcodec.
2180  */
2181  enum AVSampleFormat sample_fmt; ///< sample format
2182 
2183  /* The following data should not be initialized. */
2184  /**
2185  * Number of samples per channel in an audio frame.
2186  *
2187  * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2188  * except the last must contain exactly frame_size samples per channel.
2189  * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2190  * frame size is not restricted.
2191  * - decoding: may be set by some decoders to indicate constant frame size
2192  */
2194 
2195  /**
2196  * Frame counter, set by libavcodec.
2197  *
2198  * - decoding: total number of frames returned from the decoder so far.
2199  * - encoding: total number of frames passed to the encoder so far.
2200  *
2201  * @note the counter is not incremented if encoding/decoding resulted in
2202  * an error.
2203  */
2205 
2206  /**
2207  * number of bytes per packet if constant and known or 0
2208  * Used by some WAV based audio codecs.
2209  */
2211 
2212  /**
2213  * Audio cutoff bandwidth (0 means "automatic")
2214  * - encoding: Set by user.
2215  * - decoding: unused
2216  */
2217  int cutoff;
2218 
2219  /**
2220  * Audio channel layout.
2221  * - encoding: set by user.
2222  * - decoding: set by user, may be overwritten by libavcodec.
2223  */
2224  uint64_t channel_layout;
2225 
2226  /**
2227  * Request decoder to use this channel layout if it can (0 for default)
2228  * - encoding: unused
2229  * - decoding: Set by user.
2230  */
2232 
2233  /**
2234  * Type of service that the audio stream conveys.
2235  * - encoding: Set by user.
2236  * - decoding: Set by libavcodec.
2237  */
2239 
2240  /**
2241  * desired sample format
2242  * - encoding: Not used.
2243  * - decoding: Set by user.
2244  * Decoder will decode to this format if it can.
2245  */
2247 
2248  /**
2249  * This callback is called at the beginning of each frame to get data
2250  * buffer(s) for it. There may be one contiguous buffer for all the data or
2251  * there may be a buffer per each data plane or anything in between. What
2252  * this means is, you may set however many entries in buf[] you feel necessary.
2253  * Each buffer must be reference-counted using the AVBuffer API (see description
2254  * of buf[] below).
2255  *
2256  * The following fields will be set in the frame before this callback is
2257  * called:
2258  * - format
2259  * - width, height (video only)
2260  * - sample_rate, channel_layout, nb_samples (audio only)
2261  * Their values may differ from the corresponding values in
2262  * AVCodecContext. This callback must use the frame values, not the codec
2263  * context values, to calculate the required buffer size.
2264  *
2265  * This callback must fill the following fields in the frame:
2266  * - data[]
2267  * - linesize[]
2268  * - extended_data:
2269  * * if the data is planar audio with more than 8 channels, then this
2270  * callback must allocate and fill extended_data to contain all pointers
2271  * to all data planes. data[] must hold as many pointers as it can.
2272  * extended_data must be allocated with av_malloc() and will be freed in
2273  * av_frame_unref().
2274  * * otherwise extended_data must point to data
2275  * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2276  * the frame's data and extended_data pointers must be contained in these. That
2277  * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2278  * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2279  * and av_buffer_ref().
2280  * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2281  * this callback and filled with the extra buffers if there are more
2282  * buffers than buf[] can hold. extended_buf will be freed in
2283  * av_frame_unref().
2284  *
2285  * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
2286  * avcodec_default_get_buffer2() instead of providing buffers allocated by
2287  * some other means.
2288  *
2289  * Each data plane must be aligned to the maximum required by the target
2290  * CPU.
2291  *
2292  * @see avcodec_default_get_buffer2()
2293  *
2294  * Video:
2295  *
2296  * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2297  * (read and/or written to if it is writable) later by libavcodec.
2298  *
2299  * avcodec_align_dimensions2() should be used to find the required width and
2300  * height, as they normally need to be rounded up to the next multiple of 16.
2301  *
2302  * Some decoders do not support linesizes changing between frames.
2303  *
2304  * If frame multithreading is used and thread_safe_callbacks is set,
2305  * this callback may be called from a different thread, but not from more
2306  * than one at once. Does not need to be reentrant.
2307  *
2308  * @see avcodec_align_dimensions2()
2309  *
2310  * Audio:
2311  *
2312  * Decoders request a buffer of a particular size by setting
2313  * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2314  * however, utilize only part of the buffer by setting AVFrame.nb_samples
2315  * to a smaller value in the output frame.
2316  *
2317  * As a convenience, av_samples_get_buffer_size() and
2318  * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2319  * functions to find the required data size and to fill data pointers and
2320  * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2321  * since all planes must be the same size.
2322  *
2323  * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2324  *
2325  * - encoding: unused
2326  * - decoding: Set by libavcodec, user can override.
2327  */
2329 
2330  /**
2331  * If non-zero, the decoded audio and video frames returned from
2332  * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2333  * and are valid indefinitely. The caller must free them with
2334  * av_frame_unref() when they are not needed anymore.
2335  * Otherwise, the decoded frames must not be freed by the caller and are
2336  * only valid until the next decode call.
2337  *
2338  * This is always automatically enabled if avcodec_receive_frame() is used.
2339  *
2340  * - encoding: unused
2341  * - decoding: set by the caller before avcodec_open2().
2342  */
2345 
2346  /* - encoding parameters */
2347  float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2348  float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2349 
2350  /**
2351  * minimum quantizer
2352  * - encoding: Set by user.
2353  * - decoding: unused
2354  */
2355  int qmin;
2356 
2357  /**
2358  * maximum quantizer
2359  * - encoding: Set by user.
2360  * - decoding: unused
2361  */
2362  int qmax;
2363 
2364  /**
2365  * maximum quantizer difference between frames
2366  * - encoding: Set by user.
2367  * - decoding: unused
2368  */
2370 
2371  /**
2372  * decoder bitstream buffer size
2373  * - encoding: Set by user.
2374  * - decoding: unused
2375  */
2377 
2378  /**
2379  * ratecontrol override, see RcOverride
2380  * - encoding: Allocated/set/freed by user.
2381  * - decoding: unused
2382  */
2385 
2386  /**
2387  * maximum bitrate
2388  * - encoding: Set by user.
2389  * - decoding: Set by user, may be overwritten by libavcodec.
2390  */
2391  int64_t rc_max_rate;
2392 
2393  /**
2394  * minimum bitrate
2395  * - encoding: Set by user.
2396  * - decoding: unused
2397  */
2398  int64_t rc_min_rate;
2399 
2400  /**
2401  * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2402  * - encoding: Set by user.
2403  * - decoding: unused.
2404  */
2406 
2407  /**
2408  * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2409  * - encoding: Set by user.
2410  * - decoding: unused.
2411  */
2413 
2414  /**
2415  * Number of bits which should be loaded into the rc buffer before decoding starts.
2416  * - encoding: Set by user.
2417  * - decoding: unused
2418  */
2420 
2421 #if FF_API_CODER_TYPE
2422 #define FF_CODER_TYPE_VLC 0
2423 #define FF_CODER_TYPE_AC 1
2424 #define FF_CODER_TYPE_RAW 2
2425 #define FF_CODER_TYPE_RLE 3
2426  /**
2427  * @deprecated use encoder private options instead
2428  */
2431 #endif /* FF_API_CODER_TYPE */
2432 
2433 #if FF_API_PRIVATE_OPT
2434  /** @deprecated use encoder private options instead */
2437 #endif
2438 
2439 #if FF_API_PRIVATE_OPT
2440  /** @deprecated use encoder private options instead */
2443 
2444  /** @deprecated use encoder private options instead */
2447 
2448  /** @deprecated use encoder private options instead */
2451 
2452  /** @deprecated use encoder private options instead */
2455 #endif /* FF_API_PRIVATE_OPT */
2456 
2457  /**
2458  * trellis RD quantization
2459  * - encoding: Set by user.
2460  * - decoding: unused
2461  */
2462  int trellis;
2463 
2464 #if FF_API_PRIVATE_OPT
2465  /** @deprecated use encoder private options instead */
2468 
2469  /** @deprecated use encoder private options instead */
2472 
2473  /** @deprecated use encoder private options instead */
2476 #endif
2477 
2478 #if FF_API_RTP_CALLBACK
2479  /**
2480  * @deprecated unused
2481  */
2482  /* The RTP callback: This function is called */
2483  /* every time the encoder has a packet to send. */
2484  /* It depends on the encoder if the data starts */
2485  /* with a Start Code (it should). H.263 does. */
2486  /* mb_nb contains the number of macroblocks */
2487  /* encoded in the RTP payload. */
2489  void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2490 #endif
2491 
2492 #if FF_API_PRIVATE_OPT
2493  /** @deprecated use encoder private options instead */
2495  int rtp_payload_size; /* The size of the RTP payload: the coder will */
2496  /* do its best to deliver a chunk with size */
2497  /* below rtp_payload_size, the chunk will start */
2498  /* with a start code on some codecs like H.263. */
2499  /* This doesn't take account of any particular */
2500  /* headers inside the transmitted RTP payload. */
2501 #endif
2502 
2503 #if FF_API_STAT_BITS
2504  /* statistics, used for 2-pass encoding */
2506  int mv_bits;
2514  int i_count;
2516  int p_count;
2521 
2522  /** @deprecated this field is unused */
2525 #endif
2526 
2527  /**
2528  * pass1 encoding statistics output buffer
2529  * - encoding: Set by libavcodec.
2530  * - decoding: unused
2531  */
2532  char *stats_out;
2533 
2534  /**
2535  * pass2 encoding statistics input buffer
2536  * Concatenated stuff from stats_out of pass1 should be placed here.
2537  * - encoding: Allocated/set/freed by user.
2538  * - decoding: unused
2539  */
2540  char *stats_in;
2541 
2542  /**
2543  * Work around bugs in encoders which sometimes cannot be detected automatically.
2544  * - encoding: Set by user
2545  * - decoding: Set by user
2546  */
2548 #define FF_BUG_AUTODETECT 1 ///< autodetection
2549 #define FF_BUG_XVID_ILACE 4
2550 #define FF_BUG_UMP4 8
2551 #define FF_BUG_NO_PADDING 16
2552 #define FF_BUG_AMV 32
2553 #define FF_BUG_QPEL_CHROMA 64
2554 #define FF_BUG_STD_QPEL 128
2555 #define FF_BUG_QPEL_CHROMA2 256
2556 #define FF_BUG_DIRECT_BLOCKSIZE 512
2557 #define FF_BUG_EDGE 1024
2558 #define FF_BUG_HPEL_CHROMA 2048
2559 #define FF_BUG_DC_CLIP 4096
2560 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2561 #define FF_BUG_TRUNCATED 16384
2562 #define FF_BUG_IEDGE 32768
2563 
2564  /**
2565  * strictly follow the standard (MPEG-4, ...).
2566  * - encoding: Set by user.
2567  * - decoding: Set by user.
2568  * Setting this to STRICT or higher means the encoder and decoder will
2569  * generally do stupid things, whereas setting it to unofficial or lower
2570  * will mean the encoder might produce output that is not supported by all
2571  * spec-compliant decoders. Decoders don't differentiate between normal,
2572  * unofficial and experimental (that is, they always try to decode things
2573  * when they can) unless they are explicitly asked to behave stupidly
2574  * (=strictly conform to the specs)
2575  */
2577 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2578 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2579 #define FF_COMPLIANCE_NORMAL 0
2580 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2581 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2582 
2583  /**
2584  * error concealment flags
2585  * - encoding: unused
2586  * - decoding: Set by user.
2587  */
2589 #define FF_EC_GUESS_MVS 1
2590 #define FF_EC_DEBLOCK 2
2591 #define FF_EC_FAVOR_INTER 256
2592 
2593  /**
2594  * debug
2595  * - encoding: Set by user.
2596  * - decoding: Set by user.
2597  */
2598  int debug;
2599 #define FF_DEBUG_PICT_INFO 1
2600 #define FF_DEBUG_RC 2
2601 #define FF_DEBUG_BITSTREAM 4
2602 #define FF_DEBUG_MB_TYPE 8
2603 #define FF_DEBUG_QP 16
2604 #if FF_API_DEBUG_MV
2605 /**
2606  * @deprecated this option does nothing
2607  */
2608 #define FF_DEBUG_MV 32
2609 #endif
2610 #define FF_DEBUG_DCT_COEFF 0x00000040
2611 #define FF_DEBUG_SKIP 0x00000080
2612 #define FF_DEBUG_STARTCODE 0x00000100
2613 #define FF_DEBUG_ER 0x00000400
2614 #define FF_DEBUG_MMCO 0x00000800
2615 #define FF_DEBUG_BUGS 0x00001000
2616 #if FF_API_DEBUG_MV
2617 #define FF_DEBUG_VIS_QP 0x00002000
2618 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2619 #endif
2620 #define FF_DEBUG_BUFFERS 0x00008000
2621 #define FF_DEBUG_THREADS 0x00010000
2622 #define FF_DEBUG_GREEN_MD 0x00800000
2623 #define FF_DEBUG_NOMC 0x01000000
2624 
2625 #if FF_API_DEBUG_MV
2626  /**
2627  * debug
2628  * - encoding: Set by user.
2629  * - decoding: Set by user.
2630  */
2631  int debug_mv;
2632 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 // visualize forward predicted MVs of P-frames
2633 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 // visualize forward predicted MVs of B-frames
2634 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 // visualize backward predicted MVs of B-frames
2635 #endif
2636 
2637  /**
2638  * Error recognition; may misdetect some more or less valid parts as errors.
2639  * - encoding: unused
2640  * - decoding: Set by user.
2641  */
2643 
2644 /**
2645  * Verify checksums embedded in the bitstream (could be of either encoded or
2646  * decoded data, depending on the codec) and print an error message on mismatch.
2647  * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2648  * decoder returning an error.
2649  */
2650 #define AV_EF_CRCCHECK (1<<0)
2651 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
2652 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
2653 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
2654 
2655 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
2656 #define AV_EF_CAREFUL (1<<16) ///< consider things that violate the spec, are fast to calculate and have not been seen in the wild as errors
2657 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
2658 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
2659 
2660 
2661  /**
2662  * opaque 64-bit number (generally a PTS) that will be reordered and
2663  * output in AVFrame.reordered_opaque
2664  * - encoding: unused
2665  * - decoding: Set by user.
2666  */
2668 
2669  /**
2670  * Hardware accelerator in use
2671  * - encoding: unused.
2672  * - decoding: Set by libavcodec
2673  */
2674  const struct AVHWAccel *hwaccel;
2675 
2676  /**
2677  * Hardware accelerator context.
2678  * For some hardware accelerators, a global context needs to be
2679  * provided by the user. In that case, this holds display-dependent
2680  * data FFmpeg cannot instantiate itself. Please refer to the
2681  * FFmpeg HW accelerator documentation to know how to fill this
2682  * is. e.g. for VA API, this is a struct vaapi_context.
2683  * - encoding: unused
2684  * - decoding: Set by user
2685  */
2687 
2688  /**
2689  * error
2690  * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
2691  * - decoding: unused
2692  */
2694 
2695  /**
2696  * DCT algorithm, see FF_DCT_* below
2697  * - encoding: Set by user.
2698  * - decoding: unused
2699  */
2701 #define FF_DCT_AUTO 0
2702 #define FF_DCT_FASTINT 1
2703 #define FF_DCT_INT 2
2704 #define FF_DCT_MMX 3
2705 #define FF_DCT_ALTIVEC 5
2706 #define FF_DCT_FAAN 6
2707 
2708  /**
2709  * IDCT algorithm, see FF_IDCT_* below.
2710  * - encoding: Set by user.
2711  * - decoding: Set by user.
2712  */
2714 #define FF_IDCT_AUTO 0
2715 #define FF_IDCT_INT 1
2716 #define FF_IDCT_SIMPLE 2
2717 #define FF_IDCT_SIMPLEMMX 3
2718 #define FF_IDCT_ARM 7
2719 #define FF_IDCT_ALTIVEC 8
2720 #define FF_IDCT_SIMPLEARM 10
2721 #define FF_IDCT_XVID 14
2722 #define FF_IDCT_SIMPLEARMV5TE 16
2723 #define FF_IDCT_SIMPLEARMV6 17
2724 #define FF_IDCT_FAAN 20
2725 #define FF_IDCT_SIMPLENEON 22
2726 #define FF_IDCT_NONE 24 /* Used by XvMC to extract IDCT coefficients with FF_IDCT_PERM_NONE */
2727 #define FF_IDCT_SIMPLEAUTO 128
2728 
2729  /**
2730  * bits per sample/pixel from the demuxer (needed for huffyuv).
2731  * - encoding: Set by libavcodec.
2732  * - decoding: Set by user.
2733  */
2735 
2736  /**
2737  * Bits per sample/pixel of internal libavcodec pixel/sample format.
2738  * - encoding: set by user.
2739  * - decoding: set by libavcodec.
2740  */
2742 
2743 #if FF_API_LOWRES
2744  /**
2745  * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2746  * - encoding: unused
2747  * - decoding: Set by user.
2748  */
2749  int lowres;
2750 #endif
2751 
2752 #if FF_API_CODED_FRAME
2753  /**
2754  * the picture in the bitstream
2755  * - encoding: Set by libavcodec.
2756  * - decoding: unused
2757  *
2758  * @deprecated use the quality factor packet side data instead
2759  */
2761 #endif
2762 
2763  /**
2764  * thread count
2765  * is used to decide how many independent tasks should be passed to execute()
2766  * - encoding: Set by user.
2767  * - decoding: Set by user.
2768  */
2770 
2771  /**
2772  * Which multithreading methods to use.
2773  * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2774  * so clients which cannot provide future frames should not use it.
2775  *
2776  * - encoding: Set by user, otherwise the default is used.
2777  * - decoding: Set by user, otherwise the default is used.
2778  */
2780 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2781 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2782 
2783  /**
2784  * Which multithreading methods are in use by the codec.
2785  * - encoding: Set by libavcodec.
2786  * - decoding: Set by libavcodec.
2787  */
2789 
2790  /**
2791  * Set by the client if its custom get_buffer() callback can be called
2792  * synchronously from another thread, which allows faster multithreaded decoding.
2793  * draw_horiz_band() will be called from other threads regardless of this setting.
2794  * Ignored if the default get_buffer() is used.
2795  * - encoding: Set by user.
2796  * - decoding: Set by user.
2797  */
2799 
2800  /**
2801  * The codec may call this to execute several independent things.
2802  * It will return only after finishing all tasks.
2803  * The user may replace this with some multithreaded implementation,
2804  * the default implementation will execute the parts serially.
2805  * @param count the number of things to execute
2806  * - encoding: Set by libavcodec, user can override.
2807  * - decoding: Set by libavcodec, user can override.
2808  */
2809  int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2810 
2811  /**
2812  * The codec may call this to execute several independent things.
2813  * It will return only after finishing all tasks.
2814  * The user may replace this with some multithreaded implementation,
2815  * the default implementation will execute the parts serially.
2816  * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2817  * @param c context passed also to func
2818  * @param count the number of things to execute
2819  * @param arg2 argument passed unchanged to func
2820  * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2821  * @param func function that will be called count times, with jobnr from 0 to count-1.
2822  * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2823  * two instances of func executing at the same time will have the same threadnr.
2824  * @return always 0 currently, but code should handle a future improvement where when any call to func
2825  * returns < 0 no further calls to func may be done and < 0 is returned.
2826  * - encoding: Set by libavcodec, user can override.
2827  * - decoding: Set by libavcodec, user can override.
2828  */
2829  int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2830 
2831  /**
2832  * noise vs. sse weight for the nsse comparison function
2833  * - encoding: Set by user.
2834  * - decoding: unused
2835  */
2837 
2838  /**
2839  * profile
2840  * - encoding: Set by user.
2841  * - decoding: Set by libavcodec.
2842  */
2843  int profile;
2844 #define FF_PROFILE_UNKNOWN -99
2845 #define FF_PROFILE_RESERVED -100
2846 
2847 #define FF_PROFILE_AAC_MAIN 0
2848 #define FF_PROFILE_AAC_LOW 1
2849 #define FF_PROFILE_AAC_SSR 2
2850 #define FF_PROFILE_AAC_LTP 3
2851 #define FF_PROFILE_AAC_HE 4
2852 #define FF_PROFILE_AAC_HE_V2 28
2853 #define FF_PROFILE_AAC_LD 22
2854 #define FF_PROFILE_AAC_ELD 38
2855 #define FF_PROFILE_MPEG2_AAC_LOW 128
2856 #define FF_PROFILE_MPEG2_AAC_HE 131
2857 
2858 #define FF_PROFILE_DNXHD 0
2859 #define FF_PROFILE_DNXHR_LB 1
2860 #define FF_PROFILE_DNXHR_SQ 2
2861 #define FF_PROFILE_DNXHR_HQ 3
2862 #define FF_PROFILE_DNXHR_HQX 4
2863 #define FF_PROFILE_DNXHR_444 5
2864 
2865 #define FF_PROFILE_DTS 20
2866 #define FF_PROFILE_DTS_ES 30
2867 #define FF_PROFILE_DTS_96_24 40
2868 #define FF_PROFILE_DTS_HD_HRA 50
2869 #define FF_PROFILE_DTS_HD_MA 60
2870 #define FF_PROFILE_DTS_EXPRESS 70
2871 
2872 #define FF_PROFILE_MPEG2_422 0
2873 #define FF_PROFILE_MPEG2_HIGH 1
2874 #define FF_PROFILE_MPEG2_SS 2
2875 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2876 #define FF_PROFILE_MPEG2_MAIN 4
2877 #define FF_PROFILE_MPEG2_SIMPLE 5
2878 
2879 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2880 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2881 
2882 #define FF_PROFILE_H264_BASELINE 66
2883 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2884 #define FF_PROFILE_H264_MAIN 77
2885 #define FF_PROFILE_H264_EXTENDED 88
2886 #define FF_PROFILE_H264_HIGH 100
2887 #define FF_PROFILE_H264_HIGH_10 110
2888 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2889 #define FF_PROFILE_H264_MULTIVIEW_HIGH 118
2890 #define FF_PROFILE_H264_HIGH_422 122
2891 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2892 #define FF_PROFILE_H264_STEREO_HIGH 128
2893 #define FF_PROFILE_H264_HIGH_444 144
2894 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2895 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2896 #define FF_PROFILE_H264_CAVLC_444 44
2897 
2898 #define FF_PROFILE_VC1_SIMPLE 0
2899 #define FF_PROFILE_VC1_MAIN 1
2900 #define FF_PROFILE_VC1_COMPLEX 2
2901 #define FF_PROFILE_VC1_ADVANCED 3
2902 
2903 #define FF_PROFILE_MPEG4_SIMPLE 0
2904 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2905 #define FF_PROFILE_MPEG4_CORE 2
2906 #define FF_PROFILE_MPEG4_MAIN 3
2907 #define FF_PROFILE_MPEG4_N_BIT 4
2908 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2909 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2910 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2911 #define FF_PROFILE_MPEG4_HYBRID 8
2912 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2913 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2914 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2915 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2916 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2917 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2918 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2919 
2920 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 1
2921 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 2
2922 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 32768
2923 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
2924 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
2925 
2926 #define FF_PROFILE_VP9_0 0
2927 #define FF_PROFILE_VP9_1 1
2928 #define FF_PROFILE_VP9_2 2
2929 #define FF_PROFILE_VP9_3 3
2930 
2931 #define FF_PROFILE_HEVC_MAIN 1
2932 #define FF_PROFILE_HEVC_MAIN_10 2
2933 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
2934 #define FF_PROFILE_HEVC_REXT 4
2935 
2936 #define FF_PROFILE_AV1_MAIN 0
2937 #define FF_PROFILE_AV1_HIGH 1
2938 #define FF_PROFILE_AV1_PROFESSIONAL 2
2939 
2940 #define FF_PROFILE_MJPEG_HUFFMAN_BASELINE_DCT 0xc0
2941 #define FF_PROFILE_MJPEG_HUFFMAN_EXTENDED_SEQUENTIAL_DCT 0xc1
2942 #define FF_PROFILE_MJPEG_HUFFMAN_PROGRESSIVE_DCT 0xc2
2943 #define FF_PROFILE_MJPEG_HUFFMAN_LOSSLESS 0xc3
2944 #define FF_PROFILE_MJPEG_JPEG_LS 0xf7
2945 
2946 #define FF_PROFILE_SBC_MSBC 1
2947 
2948  /**
2949  * level
2950  * - encoding: Set by user.
2951  * - decoding: Set by libavcodec.
2952  */
2953  int level;
2954 #define FF_LEVEL_UNKNOWN -99
2955 
2956  /**
2957  * Skip loop filtering for selected frames.
2958  * - encoding: unused
2959  * - decoding: Set by user.
2960  */
2962 
2963  /**
2964  * Skip IDCT/dequantization for selected frames.
2965  * - encoding: unused
2966  * - decoding: Set by user.
2967  */
2969 
2970  /**
2971  * Skip decoding for selected frames.
2972  * - encoding: unused
2973  * - decoding: Set by user.
2974  */
2976 
2977  /**
2978  * Header containing style information for text subtitles.
2979  * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2980  * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2981  * the Format line following. It shouldn't include any Dialogue line.
2982  * - encoding: Set/allocated/freed by user (before avcodec_open2())
2983  * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2984  */
2987 
2988 #if FF_API_VBV_DELAY
2989  /**
2990  * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2991  * Used for compliant TS muxing.
2992  * - encoding: Set by libavcodec.
2993  * - decoding: unused.
2994  * @deprecated this value is now exported as a part of
2995  * AV_PKT_DATA_CPB_PROPERTIES packet side data
2996  */
2998  uint64_t vbv_delay;
2999 #endif
3000 
3001 #if FF_API_SIDEDATA_ONLY_PKT
3002  /**
3003  * Encoding only and set by default. Allow encoders to output packets
3004  * that do not contain any encoded data, only side data.
3005  *
3006  * Some encoders need to output such packets, e.g. to update some stream
3007  * parameters at the end of encoding.
3008  *
3009  * @deprecated this field disables the default behaviour and
3010  * it is kept only for compatibility.
3011  */
3014 #endif
3015 
3016  /**
3017  * Audio only. The number of "priming" samples (padding) inserted by the
3018  * encoder at the beginning of the audio. I.e. this number of leading
3019  * decoded samples must be discarded by the caller to get the original audio
3020  * without leading padding.
3021  *
3022  * - decoding: unused
3023  * - encoding: Set by libavcodec. The timestamps on the output packets are
3024  * adjusted by the encoder so that they always refer to the
3025  * first sample of the data actually contained in the packet,
3026  * including any added padding. E.g. if the timebase is
3027  * 1/samplerate and the timestamp of the first input sample is
3028  * 0, the timestamp of the first output packet will be
3029  * -initial_padding.
3030  */
3032 
3033  /**
3034  * - decoding: For codecs that store a framerate value in the compressed
3035  * bitstream, the decoder may export it here. { 0, 1} when
3036  * unknown.
3037  * - encoding: May be used to signal the framerate of CFR content to an
3038  * encoder.
3039  */
3041 
3042  /**
3043  * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3044  * - encoding: unused.
3045  * - decoding: Set by libavcodec before calling get_format()
3046  */
3048 
3049  /**
3050  * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3051  * - encoding unused.
3052  * - decoding set by user.
3053  */
3055 
3056  /**
3057  * AVCodecDescriptor
3058  * - encoding: unused.
3059  * - decoding: set by libavcodec.
3060  */
3062 
3063 #if !FF_API_LOWRES
3064  /**
3065  * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3066  * - encoding: unused
3067  * - decoding: Set by user.
3068  */
3069  int lowres;
3070 #endif
3071 
3072  /**
3073  * Current statistics for PTS correction.
3074  * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3075  * - encoding: unused
3076  */
3077  int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3078  int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3079  int64_t pts_correction_last_pts; /// PTS of the last frame
3080  int64_t pts_correction_last_dts; /// DTS of the last frame
3081 
3082  /**
3083  * Character encoding of the input subtitles file.
3084  * - decoding: set by user
3085  * - encoding: unused
3086  */
3088 
3089  /**
3090  * Subtitles character encoding mode. Formats or codecs might be adjusting
3091  * this setting (if they are doing the conversion themselves for instance).
3092  * - decoding: set by libavcodec
3093  * - encoding: unused
3094  */
3096 #define FF_SUB_CHARENC_MODE_DO_NOTHING -1 ///< do nothing (demuxer outputs a stream supposed to be already in UTF-8, or the codec is bitmap for instance)
3097 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
3098 #define FF_SUB_CHARENC_MODE_PRE_DECODER 1 ///< the AVPacket data needs to be recoded to UTF-8 before being fed to the decoder, requires iconv
3099 #define FF_SUB_CHARENC_MODE_IGNORE 2 ///< neither convert the subtitles, nor check them for valid UTF-8
3100 
3101  /**
3102  * Skip processing alpha if supported by codec.
3103  * Note that if the format uses pre-multiplied alpha (common with VP6,
3104  * and recommended due to better video quality/compression)
3105  * the image will look as if alpha-blended onto a black background.
3106  * However for formats that do not use pre-multiplied alpha
3107  * there might be serious artefacts (though e.g. libswscale currently
3108  * assumes pre-multiplied alpha anyway).
3109  *
3110  * - decoding: set by user
3111  * - encoding: unused
3112  */
3114 
3115  /**
3116  * Number of samples to skip after a discontinuity
3117  * - decoding: unused
3118  * - encoding: set by libavcodec
3119  */
3121 
3122 #if !FF_API_DEBUG_MV
3123  /**
3124  * debug motion vectors
3125  * - encoding: Set by user.
3126  * - decoding: Set by user.
3127  */
3129 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
3130 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
3131 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
3132 #endif
3133 
3134  /**
3135  * custom intra quantization matrix
3136  * - encoding: Set by user, can be NULL.
3137  * - decoding: unused.
3138  */
3140 
3141  /**
3142  * dump format separator.
3143  * can be ", " or "\n " or anything else
3144  * - encoding: Set by user.
3145  * - decoding: Set by user.
3146  */
3148 
3149  /**
3150  * ',' separated list of allowed decoders.
3151  * If NULL then all are allowed
3152  * - encoding: unused
3153  * - decoding: set by user
3154  */
3156 
3157  /**
3158  * Properties of the stream that gets decoded
3159  * - encoding: unused
3160  * - decoding: set by libavcodec
3161  */
3162  unsigned properties;
3163 #define FF_CODEC_PROPERTY_LOSSLESS 0x00000001
3164 #define FF_CODEC_PROPERTY_CLOSED_CAPTIONS 0x00000002
3165 
3166  /**
3167  * Additional data associated with the entire coded stream.
3168  *
3169  * - decoding: unused
3170  * - encoding: may be set by libavcodec after avcodec_open2().
3171  */
3174 
3175  /**
3176  * A reference to the AVHWFramesContext describing the input (for encoding)
3177  * or output (decoding) frames. The reference is set by the caller and
3178  * afterwards owned (and freed) by libavcodec - it should never be read by
3179  * the caller after being set.
3180  *
3181  * - decoding: This field should be set by the caller from the get_format()
3182  * callback. The previous reference (if any) will always be
3183  * unreffed by libavcodec before the get_format() call.
3184  *
3185  * If the default get_buffer2() is used with a hwaccel pixel
3186  * format, then this AVHWFramesContext will be used for
3187  * allocating the frame buffers.
3188  *
3189  * - encoding: For hardware encoders configured to use a hwaccel pixel
3190  * format, this field should be set by the caller to a reference
3191  * to the AVHWFramesContext describing input frames.
3192  * AVHWFramesContext.format must be equal to
3193  * AVCodecContext.pix_fmt.
3194  *
3195  * This field should be set before avcodec_open2() is called.
3196  */
3198 
3199  /**
3200  * Control the form of AVSubtitle.rects[N]->ass
3201  * - decoding: set by user
3202  * - encoding: unused
3203  */
3205 #define FF_SUB_TEXT_FMT_ASS 0
3206 #if FF_API_ASS_TIMING
3207 #define FF_SUB_TEXT_FMT_ASS_WITH_TIMINGS 1
3208 #endif
3209 
3210  /**
3211  * Audio only. The amount of padding (in samples) appended by the encoder to
3212  * the end of the audio. I.e. this number of decoded samples must be
3213  * discarded by the caller from the end of the stream to get the original
3214  * audio without any trailing padding.
3215  *
3216  * - decoding: unused
3217  * - encoding: unused
3218  */
3220 
3221  /**
3222  * The number of pixels per image to maximally accept.
3223  *
3224  * - decoding: set by user
3225  * - encoding: set by user
3226  */
3227  int64_t max_pixels;
3228 
3229  /**
3230  * A reference to the AVHWDeviceContext describing the device which will
3231  * be used by a hardware encoder/decoder. The reference is set by the
3232  * caller and afterwards owned (and freed) by libavcodec.
3233  *
3234  * This should be used if either the codec device does not require
3235  * hardware frames or any that are used are to be allocated internally by
3236  * libavcodec. If the user wishes to supply any of the frames used as
3237  * encoder input or decoder output then hw_frames_ctx should be used
3238  * instead. When hw_frames_ctx is set in get_format() for a decoder, this
3239  * field will be ignored while decoding the associated stream segment, but
3240  * may again be used on a following one after another get_format() call.
3241  *
3242  * For both encoders and decoders this field should be set before
3243  * avcodec_open2() is called and must not be written to thereafter.
3244  *
3245  * Note that some decoders may require this field to be set initially in
3246  * order to support hw_frames_ctx at all - in that case, all frames
3247  * contexts used must be created on the same device.
3248  */
3250 
3251  /**
3252  * Bit set of AV_HWACCEL_FLAG_* flags, which affect hardware accelerated
3253  * decoding (if active).
3254  * - encoding: unused
3255  * - decoding: Set by user (either before avcodec_open2(), or in the
3256  * AVCodecContext.get_format callback)
3257  */
3259 
3260  /**
3261  * Video decoding only. Certain video codecs support cropping, meaning that
3262  * only a sub-rectangle of the decoded frame is intended for display. This
3263  * option controls how cropping is handled by libavcodec.
3264  *
3265  * When set to 1 (the default), libavcodec will apply cropping internally.
3266  * I.e. it will modify the output frame width/height fields and offset the
3267  * data pointers (only by as much as possible while preserving alignment, or
3268  * by the full amount if the AV_CODEC_FLAG_UNALIGNED flag is set) so that
3269  * the frames output by the decoder refer only to the cropped area. The
3270  * crop_* fields of the output frames will be zero.
3271  *
3272  * When set to 0, the width/height fields of the output frames will be set
3273  * to the coded dimensions and the crop_* fields will describe the cropping
3274  * rectangle. Applying the cropping is left to the caller.
3275  *
3276  * @warning When hardware acceleration with opaque output frames is used,
3277  * libavcodec is unable to apply cropping from the top/left border.
3278  *
3279  * @note when this option is set to zero, the width/height fields of the
3280  * AVCodecContext and output AVFrames have different meanings. The codec
3281  * context fields store display dimensions (with the coded dimensions in
3282  * coded_width/height), while the frame fields store the coded dimensions
3283  * (with the display dimensions being determined by the crop_* fields).
3284  */
3286 
3287  /*
3288  * Video decoding only. Sets the number of extra hardware frames which
3289  * the decoder will allocate for use by the caller. This must be set
3290  * before avcodec_open2() is called.
3291  *
3292  * Some hardware decoders require all frames that they will use for
3293  * output to be defined in advance before decoding starts. For such
3294  * decoders, the hardware frame pool must therefore be of a fixed size.
3295  * The extra frames set here are on top of any number that the decoder
3296  * needs internally in order to operate normally (for example, frames
3297  * used as reference pictures).
3298  */
3300 } AVCodecContext;
3301 
3302 #if FF_API_CODEC_GET_SET
3303 /**
3304  * Accessors for some AVCodecContext fields. These used to be provided for ABI
3305  * compatibility, and do not need to be used anymore.
3306  */
3311 
3316 
3318 unsigned av_codec_get_codec_properties(const AVCodecContext *avctx);
3319 
3320 #if FF_API_LOWRES
3322 int av_codec_get_lowres(const AVCodecContext *avctx);
3324 void av_codec_set_lowres(AVCodecContext *avctx, int val);
3325 #endif
3326 
3328 int av_codec_get_seek_preroll(const AVCodecContext *avctx);
3330 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
3331 
3333 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
3335 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
3336 #endif
3337 
3338 /**
3339  * AVProfile.
3340  */
3341 typedef struct AVProfile {
3342  int profile;
3343  const char *name; ///< short name for the profile
3344 } AVProfile;
3345 
3346 enum {
3347  /**
3348  * The codec supports this format via the hw_device_ctx interface.
3349  *
3350  * When selecting this format, AVCodecContext.hw_device_ctx should
3351  * have been set to a device of the specified type before calling
3352  * avcodec_open2().
3353  */
3355  /**
3356  * The codec supports this format via the hw_frames_ctx interface.
3357  *
3358  * When selecting this format for a decoder,
3359  * AVCodecContext.hw_frames_ctx should be set to a suitable frames
3360  * context inside the get_format() callback. The frames context
3361  * must have been created on a device of the specified type.
3362  */
3364  /**
3365  * The codec supports this format by some internal method.
3366  *
3367  * This format can be selected without any additional configuration -
3368  * no device or frames context is required.
3369  */
3371  /**
3372  * The codec supports this format by some ad-hoc method.
3373  *
3374  * Additional settings and/or function calls are required. See the
3375  * codec-specific documentation for details. (Methods requiring
3376  * this sort of configuration are deprecated and others should be
3377  * used in preference.)
3378  */
3380 };
3381 
3382 typedef struct AVCodecHWConfig {
3383  /**
3384  * A hardware pixel format which the codec can use.
3385  */
3387  /**
3388  * Bit set of AV_CODEC_HW_CONFIG_METHOD_* flags, describing the possible
3389  * setup methods which can be used with this configuration.
3390  */
3391  int methods;
3392  /**
3393  * The device type associated with the configuration.
3394  *
3395  * Must be set for AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX and
3396  * AV_CODEC_HW_CONFIG_METHOD_HW_FRAMES_CTX, otherwise unused.
3397  */
3399 } AVCodecHWConfig;
3400 
3401 typedef struct AVCodecDefault AVCodecDefault;
3402 
3403 struct AVSubtitle;
3404 
3405 /**
3406  * AVCodec.
3407  */
3408 typedef struct AVCodec {
3409  /**
3410  * Name of the codec implementation.
3411  * The name is globally unique among encoders and among decoders (but an
3412  * encoder and a decoder can share the same name).
3413  * This is the primary way to find a codec from the user perspective.
3414  */
3415  const char *name;
3416  /**
3417  * Descriptive name for the codec, meant to be more human readable than name.
3418  * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3419  */
3420  const char *long_name;
3423  /**
3424  * Codec capabilities.
3425  * see AV_CODEC_CAP_*
3426  */
3428  const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3429  const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3430  const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3431  const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3432  const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3433  uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
3434  const AVClass *priv_class; ///< AVClass for the private context
3435  const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3436 
3437  /**
3438  * Group name of the codec implementation.
3439  * This is a short symbolic name of the wrapper backing this codec. A
3440  * wrapper uses some kind of external implementation for the codec, such
3441  * as an external library, or a codec implementation provided by the OS or
3442  * the hardware.
3443  * If this field is NULL, this is a builtin, libavcodec native codec.
3444  * If non-NULL, this will be the suffix in AVCodec.name in most cases
3445  * (usually AVCodec.name will be of the form "<codec_name>_<wrapper_name>").
3446  */
3447  const char *wrapper_name;
3448 
3449  /*****************************************************************
3450  * No fields below this line are part of the public API. They
3451  * may not be used outside of libavcodec and can be changed and
3452  * removed at will.
3453  * New public fields should be added right above.
3454  *****************************************************************
3455  */
3457  struct AVCodec *next;
3458  /**
3459  * @name Frame-level threading support functions
3460  * @{
3461  */
3462  /**
3463  * If defined, called on thread contexts when they are created.
3464  * If the codec allocates writable tables in init(), re-allocate them here.
3465  * priv_data will be set to a copy of the original.
3466  */
3468  /**
3469  * Copy necessary context variables from a previous thread context to the current one.
3470  * If not defined, the next thread will start automatically; otherwise, the codec
3471  * must call ff_thread_finish_setup().
3472  *
3473  * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3474  */
3476  /** @} */
3477 
3478  /**
3479  * Private codec-specific defaults.
3480  */
3482 
3483  /**
3484  * Initialize codec static data, called from avcodec_register().
3485  *
3486  * This is not intended for time consuming operations as it is
3487  * run for every codec regardless of that codec being used.
3488  */
3489  void (*init_static_data)(struct AVCodec *codec);
3490 
3492  int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3493  const struct AVSubtitle *sub);
3494  /**
3495  * Encode data to an AVPacket.
3496  *
3497  * @param avctx codec context
3498  * @param avpkt output AVPacket (may contain a user-provided buffer)
3499  * @param[in] frame AVFrame containing the raw data to be encoded
3500  * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3501  * non-empty packet was returned in avpkt.
3502  * @return 0 on success, negative error code on failure
3503  */
3504  int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3505  int *got_packet_ptr);
3506  int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3507  int (*close)(AVCodecContext *);
3508  /**
3509  * Encode API with decoupled packet/frame dataflow. The API is the
3510  * same as the avcodec_ prefixed APIs (avcodec_send_frame() etc.), except
3511  * that:
3512  * - never called if the codec is closed or the wrong type,
3513  * - if AV_CODEC_CAP_DELAY is not set, drain frames are never sent,
3514  * - only one drain frame is ever passed down,
3515  */
3516  int (*send_frame)(AVCodecContext *avctx, const AVFrame *frame);
3517  int (*receive_packet)(AVCodecContext *avctx, AVPacket *avpkt);
3518 
3519  /**
3520  * Decode API with decoupled packet/frame dataflow. This function is called
3521  * to get one output frame. It should call ff_decode_get_packet() to obtain
3522  * input data.
3523  */
3525  /**
3526  * Flush buffers.
3527  * Will be called when seeking
3528  */
3530  /**
3531  * Internal codec capabilities.
3532  * See FF_CODEC_CAP_* in internal.h
3533  */
3535 
3536  /**
3537  * Decoding only, a comma-separated list of bitstream filters to apply to
3538  * packets before decoding.
3539  */
3540  const char *bsfs;
3541 
3542  /**
3543  * Array of pointers to hardware configurations supported by the codec,
3544  * or NULL if no hardware supported. The array is terminated by a NULL
3545  * pointer.
3546  *
3547  * The user can only access this field via avcodec_get_hw_config().
3548  */
3550 } AVCodec;
3551 
3552 #if FF_API_CODEC_GET_SET
3554 int av_codec_get_max_lowres(const AVCodec *codec);
3555 #endif
3556 
3557 struct MpegEncContext;
3558 
3559 /**
3560  * Retrieve supported hardware configurations for a codec.
3561  *
3562  * Values of index from zero to some maximum return the indexed configuration
3563  * descriptor; all other values return NULL. If the codec does not support
3564  * any hardware configurations then it will always return NULL.
3565  */
3566 const AVCodecHWConfig *avcodec_get_hw_config(const AVCodec *codec, int index);
3567 
3568 /**
3569  * @defgroup lavc_hwaccel AVHWAccel
3570  *
3571  * @note Nothing in this structure should be accessed by the user. At some
3572  * point in future it will not be externally visible at all.
3573  *
3574  * @{
3575  */
3576 typedef struct AVHWAccel {
3577  /**
3578  * Name of the hardware accelerated codec.
3579  * The name is globally unique among encoders and among decoders (but an
3580  * encoder and a decoder can share the same name).
3581  */
3582  const char *name;
3583 
3584  /**
3585  * Type of codec implemented by the hardware accelerator.
3586  *
3587  * See AVMEDIA_TYPE_xxx
3588  */
3590 
3591  /**
3592  * Codec implemented by the hardware accelerator.
3593  *
3594  * See AV_CODEC_ID_xxx
3595  */
3597 
3598  /**
3599  * Supported pixel format.
3600  *
3601  * Only hardware accelerated formats are supported here.
3602  */
3604 
3605  /**
3606  * Hardware accelerated codec capabilities.
3607  * see AV_HWACCEL_CODEC_CAP_*
3608  */
3610 
3611  /*****************************************************************
3612  * No fields below this line are part of the public API. They
3613  * may not be used outside of libavcodec and can be changed and
3614  * removed at will.
3615  * New public fields should be added right above.
3616  *****************************************************************
3617  */
3618 
3619  /**
3620  * Allocate a custom buffer
3621  */
3623 
3624  /**
3625  * Called at the beginning of each frame or field picture.
3626  *
3627  * Meaningful frame information (codec specific) is guaranteed to
3628  * be parsed at this point. This function is mandatory.
3629  *
3630  * Note that buf can be NULL along with buf_size set to 0.
3631  * Otherwise, this means the whole frame is available at this point.
3632  *
3633  * @param avctx the codec context
3634  * @param buf the frame data buffer base
3635  * @param buf_size the size of the frame in bytes
3636  * @return zero if successful, a negative value otherwise
3637  */
3638  int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3639 
3640  /**
3641  * Callback for parameter data (SPS/PPS/VPS etc).
3642  *
3643  * Useful for hardware decoders which keep persistent state about the
3644  * video parameters, and need to receive any changes to update that state.
3645  *
3646  * @param avctx the codec context
3647  * @param type the nal unit type
3648  * @param buf the nal unit data buffer
3649  * @param buf_size the size of the nal unit in bytes
3650  * @return zero if successful, a negative value otherwise
3651  */
3652  int (*decode_params)(AVCodecContext *avctx, int type, const uint8_t *buf, uint32_t buf_size);
3653 
3654  /**
3655  * Callback for each slice.
3656  *
3657  * Meaningful slice information (codec specific) is guaranteed to
3658  * be parsed at this point. This function is mandatory.
3659  * The only exception is XvMC, that works on MB level.
3660  *
3661  * @param avctx the codec context
3662  * @param buf the slice data buffer base
3663  * @param buf_size the size of the slice in bytes
3664  * @return zero if successful, a negative value otherwise
3665  */
3666  int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3667 
3668  /**
3669  * Called at the end of each frame or field picture.
3670  *
3671  * The whole picture is parsed at this point and can now be sent
3672  * to the hardware accelerator. This function is mandatory.
3673  *
3674  * @param avctx the codec context
3675  * @return zero if successful, a negative value otherwise
3676  */
3677  int (*end_frame)(AVCodecContext *avctx);
3678 
3679  /**
3680  * Size of per-frame hardware accelerator private data.
3681  *
3682  * Private data is allocated with av_mallocz() before
3683  * AVCodecContext.get_buffer() and deallocated after
3684  * AVCodecContext.release_buffer().
3685  */
3687 
3688  /**
3689  * Called for every Macroblock in a slice.
3690  *
3691  * XvMC uses it to replace the ff_mpv_reconstruct_mb().
3692  * Instead of decoding to raw picture, MB parameters are
3693  * stored in an array provided by the video driver.
3694  *
3695  * @param s the mpeg context
3696  */
3698 
3699  /**
3700  * Initialize the hwaccel private data.
3701  *
3702  * This will be called from ff_get_format(), after hwaccel and
3703  * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3704  * is allocated.
3705  */
3707 
3708  /**
3709  * Uninitialize the hwaccel private data.
3710  *
3711  * This will be called from get_format() or avcodec_close(), after hwaccel
3712  * and hwaccel_context are already uninitialized.
3713  */
3715 
3716  /**
3717  * Size of the private data to allocate in
3718  * AVCodecInternal.hwaccel_priv_data.
3719  */
3721 
3722  /**
3723  * Internal hwaccel capabilities.
3724  */
3726 
3727  /**
3728  * Fill the given hw_frames context with current codec parameters. Called
3729  * from get_format. Refer to avcodec_get_hw_frames_parameters() for
3730  * details.
3731  *
3732  * This CAN be called before AVHWAccel.init is called, and you must assume
3733  * that avctx->hwaccel_priv_data is invalid.
3734  */
3735  int (*frame_params)(AVCodecContext *avctx, AVBufferRef *hw_frames_ctx);
3736 } AVHWAccel;
3737 
3738 /**
3739  * HWAccel is experimental and is thus avoided in favor of non experimental
3740  * codecs
3741  */
3742 #define AV_HWACCEL_CODEC_CAP_EXPERIMENTAL 0x0200
3743 
3744 /**
3745  * Hardware acceleration should be used for decoding even if the codec level
3746  * used is unknown or higher than the maximum supported level reported by the
3747  * hardware driver.
3748  *
3749  * It's generally a good idea to pass this flag unless you have a specific
3750  * reason not to, as hardware tends to under-report supported levels.
3751  */
3752 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3753 
3754 /**
3755  * Hardware acceleration can output YUV pixel formats with a different chroma
3756  * sampling than 4:2:0 and/or other than 8 bits per component.
3757  */
3758 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
3759 
3760 /**
3761  * Hardware acceleration should still be attempted for decoding when the
3762  * codec profile does not match the reported capabilities of the hardware.
3763  *
3764  * For example, this can be used to try to decode baseline profile H.264
3765  * streams in hardware - it will often succeed, because many streams marked
3766  * as baseline profile actually conform to constrained baseline profile.
3767  *
3768  * @warning If the stream is actually not supported then the behaviour is
3769  * undefined, and may include returning entirely incorrect output
3770  * while indicating success.
3771  */
3772 #define AV_HWACCEL_FLAG_ALLOW_PROFILE_MISMATCH (1 << 2)
3773 
3774 /**
3775  * @}
3776  */
3777 
3778 #if FF_API_AVPICTURE
3779 /**
3780  * @defgroup lavc_picture AVPicture
3781  *
3782  * Functions for working with AVPicture
3783  * @{
3784  */
3785 
3786 /**
3787  * Picture data structure.
3788  *
3789  * Up to four components can be stored into it, the last component is
3790  * alpha.
3791  * @deprecated use AVFrame or imgutils functions instead
3792  */
3793 typedef struct AVPicture {
3795  uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
3797  int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3798 } AVPicture;
3799 
3800 /**
3801  * @}
3802  */
3803 #endif
3804 
3807 
3808  SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3809 
3810  /**
3811  * Plain text, the text field must be set by the decoder and is
3812  * authoritative. ass and pict fields may contain approximations.
3813  */
3815 
3816  /**
3817  * Formatted text, the ass field must be set by the decoder and is
3818  * authoritative. pict and text fields may contain approximations.
3819  */
3821 };
3822 
3823 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3824 
3825 typedef struct AVSubtitleRect {
3826  int x; ///< top left corner of pict, undefined when pict is not set
3827  int y; ///< top left corner of pict, undefined when pict is not set
3828  int w; ///< width of pict, undefined when pict is not set
3829  int h; ///< height of pict, undefined when pict is not set
3830  int nb_colors; ///< number of colors in pict, undefined when pict is not set
3831 
3832 #if FF_API_AVPICTURE
3833  /**
3834  * @deprecated unused
3835  */
3838 #endif
3839  /**
3840  * data+linesize for the bitmap of this subtitle.
3841  * Can be set for text/ass as well once they are rendered.
3842  */
3844  int linesize[4];
3845 
3847 
3848  char *text; ///< 0 terminated plain UTF-8 text
3849 
3850  /**
3851  * 0 terminated ASS/SSA compatible event line.
3852  * The presentation of this is unaffected by the other values in this
3853  * struct.
3854  */
3855  char *ass;
3856 
3857  int flags;
3858 } AVSubtitleRect;
3859 
3860 typedef struct AVSubtitle {
3861  uint16_t format; /* 0 = graphics */
3862  uint32_t start_display_time; /* relative to packet pts, in ms */
3863  uint32_t end_display_time; /* relative to packet pts, in ms */
3864  unsigned num_rects;
3866  int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3867 } AVSubtitle;
3868 
3869 /**
3870  * This struct describes the properties of an encoded stream.
3871  *
3872  * sizeof(AVCodecParameters) is not a part of the public ABI, this struct must
3873  * be allocated with avcodec_parameters_alloc() and freed with
3874  * avcodec_parameters_free().
3875  */
3876 typedef struct AVCodecParameters {
3877  /**
3878  * General type of the encoded data.
3879  */
3881  /**
3882  * Specific type of the encoded data (the codec used).
3883  */
3885  /**
3886  * Additional information about the codec (corresponds to the AVI FOURCC).
3887  */
3888  uint32_t codec_tag;
3889 
3890  /**
3891  * Extra binary data needed for initializing the decoder, codec-dependent.
3892  *
3893  * Must be allocated with av_malloc() and will be freed by
3894  * avcodec_parameters_free(). The allocated size of extradata must be at
3895  * least extradata_size + AV_INPUT_BUFFER_PADDING_SIZE, with the padding
3896  * bytes zeroed.
3897  */
3899  /**
3900  * Size of the extradata content in bytes.
3901  */
3903 
3904  /**
3905  * - video: the pixel format, the value corresponds to enum AVPixelFormat.
3906  * - audio: the sample format, the value corresponds to enum AVSampleFormat.
3907  */
3908  int format;
3909 
3910  /**
3911  * The average bitrate of the encoded data (in bits per second).
3912  */
3913  int64_t bit_rate;
3914 
3915  /**
3916  * The number of bits per sample in the codedwords.
3917  *
3918  * This is basically the bitrate per sample. It is mandatory for a bunch of
3919  * formats to actually decode them. It's the number of bits for one sample in
3920  * the actual coded bitstream.
3921  *
3922  * This could be for example 4 for ADPCM
3923  * For PCM formats this matches bits_per_raw_sample
3924  * Can be 0
3925  */
3927 
3928  /**
3929  * This is the number of valid bits in each output sample. If the
3930  * sample format has more bits, the least significant bits are additional
3931  * padding bits, which are always 0. Use right shifts to reduce the sample
3932  * to its actual size. For example, audio formats with 24 bit samples will
3933  * have bits_per_raw_sample set to 24, and format set to AV_SAMPLE_FMT_S32.
3934  * To get the original sample use "(int32_t)sample >> 8"."
3935  *
3936  * For ADPCM this might be 12 or 16 or similar
3937  * Can be 0
3938  */
3940 
3941  /**
3942  * Codec-specific bitstream restrictions that the stream conforms to.
3943  */
3944  int profile;
3945  int level;
3946 
3947  /**
3948  * Video only. The dimensions of the video frame in pixels.
3949  */
3950  int width;
3951  int height;
3952 
3953  /**
3954  * Video only. The aspect ratio (width / height) which a single pixel
3955  * should have when displayed.
3956  *
3957  * When the aspect ratio is unknown / undefined, the numerator should be
3958  * set to 0 (the denominator may have any value).
3959  */
3961 
3962  /**
3963  * Video only. The order of the fields in interlaced video.
3964  */
3965  enum AVFieldOrder field_order;
3966 
3967  /**
3968  * Video only. Additional colorspace characteristics.
3969  */
3973  enum AVColorSpace color_space;
3974  enum AVChromaLocation chroma_location;
3975 
3976  /**
3977  * Video only. Number of delayed frames.
3978  */
3980 
3981  /**
3982  * Audio only. The channel layout bitmask. May be 0 if the channel layout is
3983  * unknown or unspecified, otherwise the number of bits set must be equal to
3984  * the channels field.
3985  */
3986  uint64_t channel_layout;
3987  /**
3988  * Audio only. The number of audio channels.
3989  */
3991  /**
3992  * Audio only. The number of audio samples per second.
3993  */
3995  /**
3996  * Audio only. The number of bytes per coded audio frame, required by some
3997  * formats.
3998  *
3999  * Corresponds to nBlockAlign in WAVEFORMATEX.
4000  */
4002  /**
4003  * Audio only. Audio frame size, if known. Required by some formats to be static.
4004  */
4006 
4007  /**
4008  * Audio only. The amount of padding (in samples) inserted by the encoder at
4009  * the beginning of the audio. I.e. this number of leading decoded samples
4010  * must be discarded by the caller to get the original audio without leading
4011  * padding.
4012  */
4014  /**
4015  * Audio only. The amount of padding (in samples) appended by the encoder to
4016  * the end of the audio. I.e. this number of decoded samples must be
4017  * discarded by the caller from the end of the stream to get the original
4018  * audio without any trailing padding.
4019  */
4021  /**
4022  * Audio only. Number of samples to skip after a discontinuity.
4023  */
4026 
4027 /**
4028  * Iterate over all registered codecs.
4029  *
4030  * @param opaque a pointer where libavcodec will store the iteration state. Must
4031  * point to NULL to start the iteration.
4032  *
4033  * @return the next registered codec or NULL when the iteration is
4034  * finished
4035  */
4036 const AVCodec *av_codec_iterate(void **opaque);
4037 
4038 #if FF_API_NEXT
4039 /**
4040  * If c is NULL, returns the first registered codec,
4041  * if c is non-NULL, returns the next registered codec after c,
4042  * or NULL if c is the last one.
4043  */
4045 AVCodec *av_codec_next(const AVCodec *c);
4046 #endif
4047 
4048 /**
4049  * Return the LIBAVCODEC_VERSION_INT constant.
4050  */
4051 unsigned avcodec_version(void);
4052 
4053 /**
4054  * Return the libavcodec build-time configuration.
4055  */
4056 const char *avcodec_configuration(void);
4057 
4058 /**
4059  * Return the libavcodec license.
4060  */
4061 const char *avcodec_license(void);
4062 
4063 #if FF_API_NEXT
4064 /**
4065  * Register the codec codec and initialize libavcodec.
4066  *
4067  * @warning either this function or avcodec_register_all() must be called
4068  * before any other libavcodec functions.
4069  *
4070  * @see avcodec_register_all()
4071  */
4073 void avcodec_register(AVCodec *codec);
4074 
4075 /**
4076  * Register all the codecs, parsers and bitstream filters which were enabled at
4077  * configuration time. If you do not call this function you can select exactly
4078  * which formats you want to support, by using the individual registration
4079  * functions.
4080  *
4081  * @see avcodec_register
4082  * @see av_register_codec_parser
4083  * @see av_register_bitstream_filter
4084  */
4086 void avcodec_register_all(void);
4087 #endif
4088 
4089 /**
4090  * Allocate an AVCodecContext and set its fields to default values. The
4091  * resulting struct should be freed with avcodec_free_context().
4092  *
4093  * @param codec if non-NULL, allocate private data and initialize defaults
4094  * for the given codec. It is illegal to then call avcodec_open2()
4095  * with a different codec.
4096  * If NULL, then the codec-specific defaults won't be initialized,
4097  * which may result in suboptimal default settings (this is
4098  * important mainly for encoders, e.g. libx264).
4099  *
4100  * @return An AVCodecContext filled with default values or NULL on failure.
4101  */
4103 
4104 /**
4105  * Free the codec context and everything associated with it and write NULL to
4106  * the provided pointer.
4107  */
4108 void avcodec_free_context(AVCodecContext **avctx);
4109 
4110 #if FF_API_GET_CONTEXT_DEFAULTS
4111 /**
4112  * @deprecated This function should not be used, as closing and opening a codec
4113  * context multiple time is not supported. A new codec context should be
4114  * allocated for each new use.
4115  */
4117 #endif
4118 
4119 /**
4120  * Get the AVClass for AVCodecContext. It can be used in combination with
4121  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4122  *
4123  * @see av_opt_find().
4124  */
4125 const AVClass *avcodec_get_class(void);
4126 
4127 #if FF_API_COPY_CONTEXT
4128 /**
4129  * Get the AVClass for AVFrame. It can be used in combination with
4130  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4131  *
4132  * @see av_opt_find().
4133  */
4134 const AVClass *avcodec_get_frame_class(void);
4135 
4136 /**
4137  * Get the AVClass for AVSubtitleRect. It can be used in combination with
4138  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4139  *
4140  * @see av_opt_find().
4141  */
4143 
4144 /**
4145  * Copy the settings of the source AVCodecContext into the destination
4146  * AVCodecContext. The resulting destination codec context will be
4147  * unopened, i.e. you are required to call avcodec_open2() before you
4148  * can use this AVCodecContext to decode/encode video/audio data.
4149  *
4150  * @param dest target codec context, should be initialized with
4151  * avcodec_alloc_context3(NULL), but otherwise uninitialized
4152  * @param src source codec context
4153  * @return AVERROR() on error (e.g. memory allocation error), 0 on success
4154  *
4155  * @deprecated The semantics of this function are ill-defined and it should not
4156  * be used. If you need to transfer the stream parameters from one codec context
4157  * to another, use an intermediate AVCodecParameters instance and the
4158  * avcodec_parameters_from_context() / avcodec_parameters_to_context()
4159  * functions.
4160  */
4163 #endif
4164 
4165 /**
4166  * Allocate a new AVCodecParameters and set its fields to default values
4167  * (unknown/invalid/0). The returned struct must be freed with
4168  * avcodec_parameters_free().
4169  */
4171 
4172 /**
4173  * Free an AVCodecParameters instance and everything associated with it and
4174  * write NULL to the supplied pointer.
4175  */
4177 
4178 /**
4179  * Copy the contents of src to dst. Any allocated fields in dst are freed and
4180  * replaced with newly allocated duplicates of the corresponding fields in src.
4181  *
4182  * @return >= 0 on success, a negative AVERROR code on failure.
4183  */
4185 
4186 /**
4187  * Fill the parameters struct based on the values from the supplied codec
4188  * context. Any allocated fields in par are freed and replaced with duplicates
4189  * of the corresponding fields in codec.
4190  *
4191  * @return >= 0 on success, a negative AVERROR code on failure
4192  */
4194  const AVCodecContext *codec);
4195 
4196 /**
4197  * Fill the codec context based on the values from the supplied codec
4198  * parameters. Any allocated fields in codec that have a corresponding field in
4199  * par are freed and replaced with duplicates of the corresponding field in par.
4200  * Fields in codec that do not have a counterpart in par are not touched.
4201  *
4202  * @return >= 0 on success, a negative AVERROR code on failure.
4203  */
4205  const AVCodecParameters *par);
4206 
4207 /**
4208  * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
4209  * function the context has to be allocated with avcodec_alloc_context3().
4210  *
4211  * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
4212  * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
4213  * retrieving a codec.
4214  *
4215  * @warning This function is not thread safe!
4216  *
4217  * @note Always call this function before using decoding routines (such as
4218  * @ref avcodec_receive_frame()).
4219  *
4220  * @code
4221  * avcodec_register_all();
4222  * av_dict_set(&opts, "b", "2.5M", 0);
4223  * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
4224  * if (!codec)
4225  * exit(1);
4226  *
4227  * context = avcodec_alloc_context3(codec);
4228  *
4229  * if (avcodec_open2(context, codec, opts) < 0)
4230  * exit(1);
4231  * @endcode
4232  *
4233  * @param avctx The context to initialize.
4234  * @param codec The codec to open this context for. If a non-NULL codec has been
4235  * previously passed to avcodec_alloc_context3() or
4236  * for this context, then this parameter MUST be either NULL or
4237  * equal to the previously passed codec.
4238  * @param options A dictionary filled with AVCodecContext and codec-private options.
4239  * On return this object will be filled with options that were not found.
4240  *
4241  * @return zero on success, a negative value on error
4242  * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
4243  * av_dict_set(), av_opt_find().
4244  */
4245 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
4246 
4247 /**
4248  * Close a given AVCodecContext and free all the data associated with it
4249  * (but not the AVCodecContext itself).
4250  *
4251  * Calling this function on an AVCodecContext that hasn't been opened will free
4252  * the codec-specific data allocated in avcodec_alloc_context3() with a non-NULL
4253  * codec. Subsequent calls will do nothing.
4254  *
4255  * @note Do not use this function. Use avcodec_free_context() to destroy a
4256  * codec context (either open or closed). Opening and closing a codec context
4257  * multiple times is not supported anymore -- use multiple codec contexts
4258  * instead.
4259  */
4260 int avcodec_close(AVCodecContext *avctx);
4261 
4262 /**
4263  * Free all allocated data in the given subtitle struct.
4264  *
4265  * @param sub AVSubtitle to free.
4266  */
4267 void avsubtitle_free(AVSubtitle *sub);
4268 
4269 /**
4270  * @}
4271  */
4272 
4273 /**
4274  * @addtogroup lavc_packet
4275  * @{
4276  */
4277 
4278 /**
4279  * Allocate an AVPacket and set its fields to default values. The resulting
4280  * struct must be freed using av_packet_free().
4281  *
4282  * @return An AVPacket filled with default values or NULL on failure.
4283  *
4284  * @note this only allocates the AVPacket itself, not the data buffers. Those
4285  * must be allocated through other means such as av_new_packet.
4286  *
4287  * @see av_new_packet
4288  */
4289 AVPacket *av_packet_alloc(void);
4290 
4291 /**
4292  * Create a new packet that references the same data as src.
4293  *
4294  * This is a shortcut for av_packet_alloc()+av_packet_ref().
4295  *
4296  * @return newly created AVPacket on success, NULL on error.
4297  *
4298  * @see av_packet_alloc
4299  * @see av_packet_ref
4300  */
4302 
4303 /**
4304  * Free the packet, if the packet is reference counted, it will be
4305  * unreferenced first.
4306  *
4307  * @param pkt packet to be freed. The pointer will be set to NULL.
4308  * @note passing NULL is a no-op.
4309  */
4310 void av_packet_free(AVPacket **pkt);
4311 
4312 /**
4313  * Initialize optional fields of a packet with default values.
4314  *
4315  * Note, this does not touch the data and size members, which have to be
4316  * initialized separately.
4317  *
4318  * @param pkt packet
4319  */
4320 void av_init_packet(AVPacket *pkt);
4321 
4322 /**
4323  * Allocate the payload of a packet and initialize its fields with
4324  * default values.
4325  *
4326  * @param pkt packet
4327  * @param size wanted payload size
4328  * @return 0 if OK, AVERROR_xxx otherwise
4329  */
4330 int av_new_packet(AVPacket *pkt, int size);
4331 
4332 /**
4333  * Reduce packet size, correctly zeroing padding
4334  *
4335  * @param pkt packet
4336  * @param size new size
4337  */
4338 void av_shrink_packet(AVPacket *pkt, int size);
4339 
4340 /**
4341  * Increase packet size, correctly zeroing padding
4342  *
4343  * @param pkt packet
4344  * @param grow_by number of bytes by which to increase the size of the packet
4345  */
4346 int av_grow_packet(AVPacket *pkt, int grow_by);
4347 
4348 /**
4349  * Initialize a reference-counted packet from av_malloc()ed data.
4350  *
4351  * @param pkt packet to be initialized. This function will set the data, size,
4352  * buf and destruct fields, all others are left untouched.
4353  * @param data Data allocated by av_malloc() to be used as packet data. If this
4354  * function returns successfully, the data is owned by the underlying AVBuffer.
4355  * The caller may not access the data through other means.
4356  * @param size size of data in bytes, without the padding. I.e. the full buffer
4357  * size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.
4358  *
4359  * @return 0 on success, a negative AVERROR on error
4360  */
4362 
4363 #if FF_API_AVPACKET_OLD_API
4364 /**
4365  * @warning This is a hack - the packet memory allocation stuff is broken. The
4366  * packet is allocated if it was not really allocated.
4367  *
4368  * @deprecated Use av_packet_ref or av_packet_make_refcounted
4369  */
4371 int av_dup_packet(AVPacket *pkt);
4372 /**
4373  * Copy packet, including contents
4374  *
4375  * @return 0 on success, negative AVERROR on fail
4376  *
4377  * @deprecated Use av_packet_ref
4378  */
4380 int av_copy_packet(AVPacket *dst, const AVPacket *src);
4381 
4382 /**
4383  * Copy packet side data
4384  *
4385  * @return 0 on success, negative AVERROR on fail
4386  *
4387  * @deprecated Use av_packet_copy_props
4388  */
4390 int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src);
4391 
4392 /**
4393  * Free a packet.
4394  *
4395  * @deprecated Use av_packet_unref
4396  *
4397  * @param pkt packet to free
4398  */
4400 void av_free_packet(AVPacket *pkt);
4401 #endif
4402 /**
4403  * Allocate new information of a packet.
4404  *
4405  * @param pkt packet
4406  * @param type side information type
4407  * @param size side information size
4408  * @return pointer to fresh allocated data or NULL otherwise
4409  */
4411  int size);
4412 
4413 /**
4414  * Wrap an existing array as a packet side data.
4415  *
4416  * @param pkt packet
4417  * @param type side information type
4418  * @param data the side data array. It must be allocated with the av_malloc()
4419  * family of functions. The ownership of the data is transferred to
4420  * pkt.
4421  * @param size side information size
4422  * @return a non-negative number on success, a negative AVERROR code on
4423  * failure. On failure, the packet is unchanged and the data remains
4424  * owned by the caller.
4425  */
4427  uint8_t *data, size_t size);
4428 
4429 /**
4430  * Shrink the already allocated side data buffer
4431  *
4432  * @param pkt packet
4433  * @param type side information type
4434  * @param size new side information size
4435  * @return 0 on success, < 0 on failure
4436  */
4438  int size);
4439 
4440 /**
4441  * Get side information from packet.
4442  *
4443  * @param pkt packet
4444  * @param type desired side information type
4445  * @param size pointer for side information size to store (optional)
4446  * @return pointer to data if present or NULL otherwise
4447  */
4449  int *size);
4450 
4451 #if FF_API_MERGE_SD_API
4454 
4457 #endif
4458 
4460 
4461 /**
4462  * Pack a dictionary for use in side_data.
4463  *
4464  * @param dict The dictionary to pack.
4465  * @param size pointer to store the size of the returned data
4466  * @return pointer to data if successful, NULL otherwise
4467  */
4469 /**
4470  * Unpack a dictionary from side_data.
4471  *
4472  * @param data data from side_data
4473  * @param size size of the data
4474  * @param dict the metadata storage dictionary
4475  * @return 0 on success, < 0 on failure
4476  */
4477 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
4478 
4479 
4480 /**
4481  * Convenience function to free all the side data stored.
4482  * All the other fields stay untouched.
4483  *
4484  * @param pkt packet
4485  */
4487 
4488 /**
4489  * Setup a new reference to the data described by a given packet
4490  *
4491  * If src is reference-counted, setup dst as a new reference to the
4492  * buffer in src. Otherwise allocate a new buffer in dst and copy the
4493  * data from src into it.
4494  *
4495  * All the other fields are copied from src.
4496  *
4497  * @see av_packet_unref
4498  *
4499  * @param dst Destination packet
4500  * @param src Source packet
4501  *
4502  * @return 0 on success, a negative AVERROR on error.
4503  */
4504 int av_packet_ref(AVPacket *dst, const AVPacket *src);
4505 
4506 /**
4507  * Wipe the packet.
4508  *
4509  * Unreference the buffer referenced by the packet and reset the
4510  * remaining packet fields to their default values.
4511  *
4512  * @param pkt The packet to be unreferenced.
4513  */
4515 
4516 /**
4517  * Move every field in src to dst and reset src.
4518  *
4519  * @see av_packet_unref
4520  *
4521  * @param src Source packet, will be reset
4522  * @param dst Destination packet
4523  */
4525 
4526 /**
4527  * Copy only "properties" fields from src to dst.
4528  *
4529  * Properties for the purpose of this function are all the fields
4530  * beside those related to the packet data (buf, data, size)
4531  *
4532  * @param dst Destination packet
4533  * @param src Source packet
4534  *
4535  * @return 0 on success AVERROR on failure.
4536  */
4537 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
4538 
4539 /**
4540  * Ensure the data described by a given packet is reference counted.
4541  *
4542  * @note This function does not ensure that the reference will be writable.
4543  * Use av_packet_make_writable instead for that purpose.
4544  *
4545  * @see av_packet_ref
4546  * @see av_packet_make_writable
4547  *
4548  * @param pkt packet whose data should be made reference counted.
4549  *
4550  * @return 0 on success, a negative AVERROR on error. On failure, the
4551  * packet is unchanged.
4552  */
4554 
4555 /**
4556  * Create a writable reference for the data described by a given packet,
4557  * avoiding data copy if possible.
4558  *
4559  * @param pkt Packet whose data should be made writable.
4560  *
4561  * @return 0 on success, a negative AVERROR on failure. On failure, the
4562  * packet is unchanged.
4563  */
4565 
4566 /**
4567  * Convert valid timing fields (timestamps / durations) in a packet from one
4568  * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
4569  * ignored.
4570  *
4571  * @param pkt packet on which the conversion will be performed
4572  * @param tb_src source timebase, in which the timing fields in pkt are
4573  * expressed
4574  * @param tb_dst destination timebase, to which the timing fields will be
4575  * converted
4576  */
4577 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
4578 
4579 /**
4580  * @}
4581  */
4582 
4583 /**
4584  * @addtogroup lavc_decoding
4585  * @{
4586  */
4587 
4588 /**
4589  * Find a registered decoder with a matching codec ID.
4590  *
4591  * @param id AVCodecID of the requested decoder
4592  * @return A decoder if one was found, NULL otherwise.
4593  */
4595 
4596 /**
4597  * Find a registered decoder with the specified name.
4598  *
4599  * @param name name of the requested decoder
4600  * @return A decoder if one was found, NULL otherwise.
4601  */
4603 
4604 /**
4605  * The default callback for AVCodecContext.get_buffer2(). It is made public so
4606  * it can be called by custom get_buffer2() implementations for decoders without
4607  * AV_CODEC_CAP_DR1 set.
4608  */
4610 
4611 /**
4612  * Modify width and height values so that they will result in a memory
4613  * buffer that is acceptable for the codec if you do not use any horizontal
4614  * padding.
4615  *
4616  * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4617  */
4619 
4620 /**
4621  * Modify width and height values so that they will result in a memory
4622  * buffer that is acceptable for the codec if you also ensure that all
4623  * line sizes are a multiple of the respective linesize_align[i].
4624  *
4625  * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4626  */
4628  int linesize_align[AV_NUM_DATA_POINTERS]);
4629 
4630 /**
4631  * Converts AVChromaLocation to swscale x/y chroma position.
4632  *
4633  * The positions represent the chroma (0,0) position in a coordinates system
4634  * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4635  *
4636  * @param xpos horizontal chroma sample position
4637  * @param ypos vertical chroma sample position
4638  */
4639 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
4640 
4641 /**
4642  * Converts swscale x/y chroma position to AVChromaLocation.
4643  *
4644  * The positions represent the chroma (0,0) position in a coordinates system
4645  * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4646  *
4647  * @param xpos horizontal chroma sample position
4648  * @param ypos vertical chroma sample position
4649  */
4650 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
4651 
4652 /**
4653  * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4654  *
4655  * Some decoders may support multiple frames in a single AVPacket. Such
4656  * decoders would then just decode the first frame and the return value would be
4657  * less than the packet size. In this case, avcodec_decode_audio4 has to be
4658  * called again with an AVPacket containing the remaining data in order to
4659  * decode the second frame, etc... Even if no frames are returned, the packet
4660  * needs to be fed to the decoder with remaining data until it is completely
4661  * consumed or an error occurs.
4662  *
4663  * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4664  * and output. This means that for some packets they will not immediately
4665  * produce decoded output and need to be flushed at the end of decoding to get
4666  * all the decoded data. Flushing is done by calling this function with packets
4667  * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4668  * returning samples. It is safe to flush even those decoders that are not
4669  * marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
4670  *
4671  * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4672  * larger than the actual read bytes because some optimized bitstream
4673  * readers read 32 or 64 bits at once and could read over the end.
4674  *
4675  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4676  * before packets may be fed to the decoder.
4677  *
4678  * @param avctx the codec context
4679  * @param[out] frame The AVFrame in which to store decoded audio samples.
4680  * The decoder will allocate a buffer for the decoded frame by
4681  * calling the AVCodecContext.get_buffer2() callback.
4682  * When AVCodecContext.refcounted_frames is set to 1, the frame is
4683  * reference counted and the returned reference belongs to the
4684  * caller. The caller must release the frame using av_frame_unref()
4685  * when the frame is no longer needed. The caller may safely write
4686  * to the frame if av_frame_is_writable() returns 1.
4687  * When AVCodecContext.refcounted_frames is set to 0, the returned
4688  * reference belongs to the decoder and is valid only until the
4689  * next call to this function or until closing or flushing the
4690  * decoder. The caller may not write to it.
4691  * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4692  * non-zero. Note that this field being set to zero
4693  * does not mean that an error has occurred. For
4694  * decoders with AV_CODEC_CAP_DELAY set, no given decode
4695  * call is guaranteed to produce a frame.
4696  * @param[in] avpkt The input AVPacket containing the input buffer.
4697  * At least avpkt->data and avpkt->size should be set. Some
4698  * decoders might also require additional fields to be set.
4699  * @return A negative error code is returned if an error occurred during
4700  * decoding, otherwise the number of bytes consumed from the input
4701  * AVPacket is returned.
4702  *
4703 * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
4704  */
4707  int *got_frame_ptr, const AVPacket *avpkt);
4708 
4709 /**
4710  * Decode the video frame of size avpkt->size from avpkt->data into picture.
4711  * Some decoders may support multiple frames in a single AVPacket, such
4712  * decoders would then just decode the first frame.
4713  *
4714  * @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
4715  * the actual read bytes because some optimized bitstream readers read 32 or 64
4716  * bits at once and could read over the end.
4717  *
4718  * @warning The end of the input buffer buf should be set to 0 to ensure that
4719  * no overreading happens for damaged MPEG streams.
4720  *
4721  * @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
4722  * between input and output, these need to be fed with avpkt->data=NULL,
4723  * avpkt->size=0 at the end to return the remaining frames.
4724  *
4725  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4726  * before packets may be fed to the decoder.
4727  *
4728  * @param avctx the codec context
4729  * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4730  * Use av_frame_alloc() to get an AVFrame. The codec will
4731  * allocate memory for the actual bitmap by calling the
4732  * AVCodecContext.get_buffer2() callback.
4733  * When AVCodecContext.refcounted_frames is set to 1, the frame is
4734  * reference counted and the returned reference belongs to the
4735  * caller. The caller must release the frame using av_frame_unref()
4736  * when the frame is no longer needed. The caller may safely write
4737  * to the frame if av_frame_is_writable() returns 1.
4738  * When AVCodecContext.refcounted_frames is set to 0, the returned
4739  * reference belongs to the decoder and is valid only until the
4740  * next call to this function or until closing or flushing the
4741  * decoder. The caller may not write to it.
4742  *
4743  * @param[in] avpkt The input AVPacket containing the input buffer.
4744  * You can create such packet with av_init_packet() and by then setting
4745  * data and size, some decoders might in addition need other fields like
4746  * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4747  * fields possible.
4748  * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4749  * @return On error a negative value is returned, otherwise the number of bytes
4750  * used or zero if no frame could be decompressed.
4751  *
4752  * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
4753  */
4755 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4756  int *got_picture_ptr,
4757  const AVPacket *avpkt);
4758 
4759 /**
4760  * Decode a subtitle message.
4761  * Return a negative value on error, otherwise return the number of bytes used.
4762  * If no subtitle could be decompressed, got_sub_ptr is zero.
4763  * Otherwise, the subtitle is stored in *sub.
4764  * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4765  * simplicity, because the performance difference is expect to be negligible
4766  * and reusing a get_buffer written for video codecs would probably perform badly
4767  * due to a potentially very different allocation pattern.
4768  *
4769  * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4770  * and output. This means that for some packets they will not immediately
4771  * produce decoded output and need to be flushed at the end of decoding to get
4772  * all the decoded data. Flushing is done by calling this function with packets
4773  * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4774  * returning subtitles. It is safe to flush even those decoders that are not
4775  * marked with AV_CODEC_CAP_DELAY, then no subtitles will be returned.
4776  *
4777  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4778  * before packets may be fed to the decoder.
4779  *
4780  * @param avctx the codec context
4781  * @param[out] sub The Preallocated AVSubtitle in which the decoded subtitle will be stored,
4782  * must be freed with avsubtitle_free if *got_sub_ptr is set.
4783  * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4784  * @param[in] avpkt The input AVPacket containing the input buffer.
4785  */
4787  int *got_sub_ptr,
4788  AVPacket *avpkt);
4789 
4790 /**
4791  * Supply raw packet data as input to a decoder.
4792  *
4793  * Internally, this call will copy relevant AVCodecContext fields, which can
4794  * influence decoding per-packet, and apply them when the packet is actually
4795  * decoded. (For example AVCodecContext.skip_frame, which might direct the
4796  * decoder to drop the frame contained by the packet sent with this function.)
4797  *
4798  * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4799  * larger than the actual read bytes because some optimized bitstream
4800  * readers read 32 or 64 bits at once and could read over the end.
4801  *
4802  * @warning Do not mix this API with the legacy API (like avcodec_decode_video2())
4803  * on the same AVCodecContext. It will return unexpected results now
4804  * or in future libavcodec versions.
4805  *
4806  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4807  * before packets may be fed to the decoder.
4808  *
4809  * @param avctx codec context
4810  * @param[in] avpkt The input AVPacket. Usually, this will be a single video
4811  * frame, or several complete audio frames.
4812  * Ownership of the packet remains with the caller, and the
4813  * decoder will not write to the packet. The decoder may create
4814  * a reference to the packet data (or copy it if the packet is
4815  * not reference-counted).
4816  * Unlike with older APIs, the packet is always fully consumed,
4817  * and if it contains multiple frames (e.g. some audio codecs),
4818  * will require you to call avcodec_receive_frame() multiple
4819  * times afterwards before you can send a new packet.
4820  * It can be NULL (or an AVPacket with data set to NULL and
4821  * size set to 0); in this case, it is considered a flush
4822  * packet, which signals the end of the stream. Sending the
4823  * first flush packet will return success. Subsequent ones are
4824  * unnecessary and will return AVERROR_EOF. If the decoder
4825  * still has frames buffered, it will return them after sending
4826  * a flush packet.
4827  *
4828  * @return 0 on success, otherwise negative error code:
4829  * AVERROR(EAGAIN): input is not accepted in the current state - user
4830  * must read output with avcodec_receive_frame() (once
4831  * all output is read, the packet should be resent, and
4832  * the call will not fail with EAGAIN).
4833  * AVERROR_EOF: the decoder has been flushed, and no new packets can
4834  * be sent to it (also returned if more than 1 flush
4835  * packet is sent)
4836  * AVERROR(EINVAL): codec not opened, it is an encoder, or requires flush
4837  * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
4838  * other errors: legitimate decoding errors
4839  */
4840 int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt);
4841 
4842 /**
4843  * Return decoded output data from a decoder.
4844  *
4845  * @param avctx codec context
4846  * @param frame This will be set to a reference-counted video or audio
4847  * frame (depending on the decoder type) allocated by the
4848  * decoder. Note that the function will always call
4849  * av_frame_unref(frame) before doing anything else.
4850  *
4851  * @return
4852  * 0: success, a frame was returned
4853  * AVERROR(EAGAIN): output is not available in this state - user must try
4854  * to send new input
4855  * AVERROR_EOF: the decoder has been fully flushed, and there will be
4856  * no more output frames
4857  * AVERROR(EINVAL): codec not opened, or it is an encoder
4858  * other negative values: legitimate decoding errors
4859  */
4861 
4862 /**
4863  * Supply a raw video or audio frame to the encoder. Use avcodec_receive_packet()
4864  * to retrieve buffered output packets.
4865  *
4866  * @param avctx codec context
4867  * @param[in] frame AVFrame containing the raw audio or video frame to be encoded.
4868  * Ownership of the frame remains with the caller, and the
4869  * encoder will not write to the frame. The encoder may create
4870  * a reference to the frame data (or copy it if the frame is
4871  * not reference-counted).
4872  * It can be NULL, in which case it is considered a flush
4873  * packet. This signals the end of the stream. If the encoder
4874  * still has packets buffered, it will return them after this
4875  * call. Once flushing mode has been entered, additional flush
4876  * packets are ignored, and sending frames will return
4877  * AVERROR_EOF.
4878  *
4879  * For audio:
4880  * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4881  * can have any number of samples.
4882  * If it is not set, frame->nb_samples must be equal to
4883  * avctx->frame_size for all frames except the last.
4884  * The final frame may be smaller than avctx->frame_size.
4885  * @return 0 on success, otherwise negative error code:
4886  * AVERROR(EAGAIN): input is not accepted in the current state - user
4887  * must read output with avcodec_receive_packet() (once
4888  * all output is read, the packet should be resent, and
4889  * the call will not fail with EAGAIN).
4890  * AVERROR_EOF: the encoder has been flushed, and no new frames can
4891  * be sent to it
4892  * AVERROR(EINVAL): codec not opened, refcounted_frames not set, it is a
4893  * decoder, or requires flush
4894  * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
4895  * other errors: legitimate decoding errors
4896  */
4897 int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame);
4898 
4899 /**
4900  * Read encoded data from the encoder.
4901  *
4902  * @param avctx codec context
4903  * @param avpkt This will be set to a reference-counted packet allocated by the
4904  * encoder. Note that the function will always call
4905  * av_frame_unref(frame) before doing anything else.
4906  * @return 0 on success, otherwise negative error code:
4907  * AVERROR(EAGAIN): output is not available in the current state - user
4908  * must try to send input
4909  * AVERROR_EOF: the encoder has been fully flushed, and there will be
4910  * no more output packets
4911  * AVERROR(EINVAL): codec not opened, or it is an encoder
4912  * other errors: legitimate decoding errors
4913  */
4914 int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt);
4915 
4916 /**
4917  * Create and return a AVHWFramesContext with values adequate for hardware
4918  * decoding. This is meant to get called from the get_format callback, and is
4919  * a helper for preparing a AVHWFramesContext for AVCodecContext.hw_frames_ctx.
4920  * This API is for decoding with certain hardware acceleration modes/APIs only.
4921  *
4922  * The returned AVHWFramesContext is not initialized. The caller must do this
4923  * with av_hwframe_ctx_init().
4924  *
4925  * Calling this function is not a requirement, but makes it simpler to avoid
4926  * codec or hardware API specific details when manually allocating frames.
4927  *
4928  * Alternatively to this, an API user can set AVCodecContext.hw_device_ctx,
4929  * which sets up AVCodecContext.hw_frames_ctx fully automatically, and makes
4930  * it unnecessary to call this function or having to care about
4931  * AVHWFramesContext initialization at all.
4932  *
4933  * There are a number of requirements for calling this function:
4934  *
4935  * - It must be called from get_format with the same avctx parameter that was
4936  * passed to get_format. Calling it outside of get_format is not allowed, and
4937  * can trigger undefined behavior.
4938  * - The function is not always supported (see description of return values).
4939  * Even if this function returns successfully, hwaccel initialization could
4940  * fail later. (The degree to which implementations check whether the stream
4941  * is actually supported varies. Some do this check only after the user's
4942  * get_format callback returns.)
4943  * - The hw_pix_fmt must be one of the choices suggested by get_format. If the
4944  * user decides to use a AVHWFramesContext prepared with this API function,
4945  * the user must return the same hw_pix_fmt from get_format.
4946  * - The device_ref passed to this function must support the given hw_pix_fmt.
4947  * - After calling this API function, it is the user's responsibility to
4948  * initialize the AVHWFramesContext (returned by the out_frames_ref parameter),
4949  * and to set AVCodecContext.hw_frames_ctx to it. If done, this must be done
4950  * before returning from get_format (this is implied by the normal
4951  * AVCodecContext.hw_frames_ctx API rules).
4952  * - The AVHWFramesContext parameters may change every time time get_format is
4953  * called. Also, AVCodecContext.hw_frames_ctx is reset before get_format. So
4954  * you are inherently required to go through this process again on every
4955  * get_format call.
4956  * - It is perfectly possible to call this function without actually using
4957  * the resulting AVHWFramesContext. One use-case might be trying to reuse a
4958  * previously initialized AVHWFramesContext, and calling this API function
4959  * only to test whether the required frame parameters have changed.
4960  * - Fields that use dynamically allocated values of any kind must not be set
4961  * by the user unless setting them is explicitly allowed by the documentation.
4962  * If the user sets AVHWFramesContext.free and AVHWFramesContext.user_opaque,
4963  * the new free callback must call the potentially set previous free callback.
4964  * This API call may set any dynamically allocated fields, including the free
4965  * callback.
4966  *
4967  * The function will set at least the following fields on AVHWFramesContext
4968  * (potentially more, depending on hwaccel API):
4969  *
4970  * - All fields set by av_hwframe_ctx_alloc().
4971  * - Set the format field to hw_pix_fmt.
4972  * - Set the sw_format field to the most suited and most versatile format. (An
4973  * implication is that this will prefer generic formats over opaque formats
4974  * with arbitrary restrictions, if possible.)
4975  * - Set the width/height fields to the coded frame size, rounded up to the
4976  * API-specific minimum alignment.
4977  * - Only _if_ the hwaccel requires a pre-allocated pool: set the initial_pool_size
4978  * field to the number of maximum reference surfaces possible with the codec,
4979  * plus 1 surface for the user to work (meaning the user can safely reference
4980  * at most 1 decoded surface at a time), plus additional buffering introduced
4981  * by frame threading. If the hwaccel does not require pre-allocation, the
4982  * field is left to 0, and the decoder will allocate new surfaces on demand
4983  * during decoding.
4984  * - Possibly AVHWFramesContext.hwctx fields, depending on the underlying
4985  * hardware API.
4986  *
4987  * Essentially, out_frames_ref returns the same as av_hwframe_ctx_alloc(), but
4988  * with basic frame parameters set.
4989  *
4990  * The function is stateless, and does not change the AVCodecContext or the
4991  * device_ref AVHWDeviceContext.
4992  *
4993  * @param avctx The context which is currently calling get_format, and which
4994  * implicitly contains all state needed for filling the returned
4995  * AVHWFramesContext properly.
4996  * @param device_ref A reference to the AVHWDeviceContext describing the device
4997  * which will be used by the hardware decoder.
4998  * @param hw_pix_fmt The hwaccel format you are going to return from get_format.
4999  * @param out_frames_ref On success, set to a reference to an _uninitialized_
5000  * AVHWFramesContext, created from the given device_ref.
5001  * Fields will be set to values required for decoding.
5002  * Not changed if an error is returned.
5003  * @return zero on success, a negative value on error. The following error codes
5004  * have special semantics:
5005  * AVERROR(ENOENT): the decoder does not support this functionality. Setup
5006  * is always manual, or it is a decoder which does not
5007  * support setting AVCodecContext.hw_frames_ctx at all,
5008  * or it is a software format.
5009  * AVERROR(EINVAL): it is known that hardware decoding is not supported for
5010  * this configuration, or the device_ref is not supported
5011  * for the hwaccel referenced by hw_pix_fmt.
5012  */
5014  AVBufferRef *device_ref,
5016  AVBufferRef **out_frames_ref);
5017 
5018 
5019 
5020 /**
5021  * @defgroup lavc_parsing Frame parsing
5022  * @{
5023  */
5024 
5027  AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
5028  AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
5029  AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
5030 };
5031 
5032 typedef struct AVCodecParserContext {
5033  void *priv_data;
5035  int64_t frame_offset; /* offset of the current frame */
5036  int64_t cur_offset; /* current offset
5037  (incremented by each av_parser_parse()) */
5038  int64_t next_frame_offset; /* offset of the next frame */
5039  /* video info */
5040  int pict_type; /* XXX: Put it back in AVCodecContext. */
5041  /**
5042  * This field is used for proper frame duration computation in lavf.
5043  * It signals, how much longer the frame duration of the current frame
5044  * is compared to normal frame duration.
5045  *
5046  * frame_duration = (1 + repeat_pict) * time_base
5047  *
5048  * It is used by codecs like H.264 to display telecined material.
5049  */
5050  int repeat_pict; /* XXX: Put it back in AVCodecContext. */
5051  int64_t pts; /* pts of the current frame */
5052  int64_t dts; /* dts of the current frame */
5053 
5054  /* private data */
5055  int64_t last_pts;
5056  int64_t last_dts;
5058 
5059 #define AV_PARSER_PTS_NB 4
5061  int64_t cur_frame_offset[AV_PARSER_PTS_NB];
5062  int64_t cur_frame_pts[AV_PARSER_PTS_NB];
5063  int64_t cur_frame_dts[AV_PARSER_PTS_NB];
5064 
5065  int flags;
5066 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
5067 #define PARSER_FLAG_ONCE 0x0002
5068 /// Set if the parser has a valid file offset
5069 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
5070 #define PARSER_FLAG_USE_CODEC_TS 0x1000
5071 
5072  int64_t offset; ///< byte offset from starting packet start
5073  int64_t cur_frame_end[AV_PARSER_PTS_NB];
5074 
5075  /**
5076  * Set by parser to 1 for key frames and 0 for non-key frames.
5077  * It is initialized to -1, so if the parser doesn't set this flag,
5078  * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
5079  * will be used.
5080  */
5082 
5083 #if FF_API_CONVERGENCE_DURATION
5084  /**
5085  * @deprecated unused
5086  */
5089 #endif
5090 
5091  // Timestamp generation support:
5092  /**
5093  * Synchronization point for start of timestamp generation.
5094  *
5095  * Set to >0 for sync point, 0 for no sync point and <0 for undefined
5096  * (default).
5097  *
5098  * For example, this corresponds to presence of H.264 buffering period
5099  * SEI message.
5100  */
5102 
5103  /**
5104  * Offset of the current timestamp against last timestamp sync point in
5105  * units of AVCodecContext.time_base.
5106  *
5107  * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
5108  * contain a valid timestamp offset.
5109  *
5110  * Note that the timestamp of sync point has usually a nonzero
5111  * dts_ref_dts_delta, which refers to the previous sync point. Offset of
5112  * the next frame after timestamp sync point will be usually 1.
5113  *
5114  * For example, this corresponds to H.264 cpb_removal_delay.
5115  */
5117 
5118  /**
5119  * Presentation delay of current frame in units of AVCodecContext.time_base.
5120  *
5121  * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
5122  * contain valid non-negative timestamp delta (presentation time of a frame
5123  * must not lie in the past).
5124  *
5125  * This delay represents the difference between decoding and presentation
5126  * time of the frame.
5127  *
5128  * For example, this corresponds to H.264 dpb_output_delay.
5129  */
5131 
5132  /**
5133  * Position of the packet in file.
5134  *
5135  * Analogous to cur_frame_pts/dts
5136  */
5137  int64_t cur_frame_pos[AV_PARSER_PTS_NB];
5138 
5139  /**
5140  * Byte position of currently parsed frame in stream.
5141  */
5142  int64_t pos;
5143 
5144  /**
5145  * Previous frame byte position.
5146  */
5147  int64_t last_pos;
5148 
5149  /**
5150  * Duration of the current frame.
5151  * For audio, this is in units of 1 / AVCodecContext.sample_rate.
5152  * For all other types, this is in units of AVCodecContext.time_base.
5153  */
5155 
5156  enum AVFieldOrder field_order;
5157 
5158  /**
5159  * Indicate whether a picture is coded as a frame, top field or bottom field.
5160  *
5161  * For example, H.264 field_pic_flag equal to 0 corresponds to
5162  * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
5163  * equal to 1 and bottom_field_flag equal to 0 corresponds to
5164  * AV_PICTURE_STRUCTURE_TOP_FIELD.
5165  */
5166  enum AVPictureStructure picture_structure;
5167 
5168  /**
5169  * Picture number incremented in presentation or output order.
5170  * This field may be reinitialized at the first picture of a new sequence.
5171  *
5172  * For example, this corresponds to H.264 PicOrderCnt.
5173  */
5175 
5176  /**
5177  * Dimensions of the decoded video intended for presentation.
5178  */
5179  int width;
5180  int height;
5181 
5182  /**
5183  * Dimensions of the coded video.
5184  */
5187 
5188  /**
5189  * The format of the coded data, corresponds to enum AVPixelFormat for video
5190  * and for enum AVSampleFormat for audio.
5191  *
5192  * Note that a decoder can have considerable freedom in how exactly it
5193  * decodes the data, so the format reported here might be different from the
5194  * one returned by a decoder.
5195  */
5196  int format;
5198 
5199 typedef struct AVCodecParser {
5200  int codec_ids[5]; /* several codec IDs are permitted */
5202  int (*parser_init)(AVCodecParserContext *s);
5203  /* This callback never returns an error, a negative value means that
5204  * the frame start was in a previous packet. */
5205  int (*parser_parse)(AVCodecParserContext *s,
5206  AVCodecContext *avctx,
5207  const uint8_t **poutbuf, int *poutbuf_size,
5208  const uint8_t *buf, int buf_size);
5209  void (*parser_close)(AVCodecParserContext *s);
5210  int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
5212 } AVCodecParser;
5213 
5214 /**
5215  * Iterate over all registered codec parsers.
5216  *
5217  * @param opaque a pointer where libavcodec will store the iteration state. Must
5218  * point to NULL to start the iteration.
5219  *
5220  * @return the next registered codec parser or NULL when the iteration is
5221  * finished
5222  */
5223 const AVCodecParser *av_parser_iterate(void **opaque);
5224 
5227 
5231 
5232 /**
5233  * Parse a packet.
5234  *
5235  * @param s parser context.
5236  * @param avctx codec context.
5237  * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
5238  * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
5239  * @param buf input buffer.
5240  * @param buf_size buffer size in bytes without the padding. I.e. the full buffer
5241  size is assumed to be buf_size + AV_INPUT_BUFFER_PADDING_SIZE.
5242  To signal EOF, this should be 0 (so that the last frame
5243  can be output).
5244  * @param pts input presentation timestamp.
5245  * @param dts input decoding timestamp.
5246  * @param pos input byte position in stream.
5247  * @return the number of bytes of the input bitstream used.
5248  *
5249  * Example:
5250  * @code
5251  * while(in_len){
5252  * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
5253  * in_data, in_len,
5254  * pts, dts, pos);
5255  * in_data += len;
5256  * in_len -= len;
5257  *
5258  * if(size)
5259  * decode_frame(data, size);
5260  * }
5261  * @endcode
5262  */
5264  AVCodecContext *avctx,
5265  uint8_t **poutbuf, int *poutbuf_size,
5266  const uint8_t *buf, int buf_size,
5267  int64_t pts, int64_t dts,
5268  int64_t pos);
5269 
5270 /**
5271  * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
5272  * @deprecated use AVBitStreamFilter
5273  */
5275  AVCodecContext *avctx,
5276  uint8_t **poutbuf, int *poutbuf_size,
5277  const uint8_t *buf, int buf_size, int keyframe);
5279 
5280 /**
5281  * @}
5282  * @}
5283  */
5284 
5285 /**
5286  * @addtogroup lavc_encoding
5287  * @{
5288  */
5289 
5290 /**
5291  * Find a registered encoder with a matching codec ID.
5292  *
5293  * @param id AVCodecID of the requested encoder
5294  * @return An encoder if one was found, NULL otherwise.
5295  */
5297 
5298 /**
5299  * Find a registered encoder with the specified name.
5300  *
5301  * @param name name of the requested encoder
5302  * @return An encoder if one was found, NULL otherwise.
5303  */
5305 
5306 /**
5307  * Encode a frame of audio.
5308  *
5309  * Takes input samples from frame and writes the next output packet, if
5310  * available, to avpkt. The output packet does not necessarily contain data for
5311  * the most recent frame, as encoders can delay, split, and combine input frames
5312  * internally as needed.
5313  *
5314  * @param avctx codec context
5315  * @param avpkt output AVPacket.
5316  * The user can supply an output buffer by setting
5317  * avpkt->data and avpkt->size prior to calling the
5318  * function, but if the size of the user-provided data is not
5319  * large enough, encoding will fail. If avpkt->data and
5320  * avpkt->size are set, avpkt->destruct must also be set. All
5321  * other AVPacket fields will be reset by the encoder using
5322  * av_init_packet(). If avpkt->data is NULL, the encoder will
5323  * allocate it. The encoder will set avpkt->size to the size
5324  * of the output packet.
5325  *
5326  * If this function fails or produces no output, avpkt will be
5327  * freed using av_packet_unref().
5328  * @param[in] frame AVFrame containing the raw audio data to be encoded.
5329  * May be NULL when flushing an encoder that has the
5330  * AV_CODEC_CAP_DELAY capability set.
5331  * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
5332  * can have any number of samples.
5333  * If it is not set, frame->nb_samples must be equal to
5334  * avctx->frame_size for all frames except the last.
5335  * The final frame may be smaller than avctx->frame_size.
5336  * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
5337  * output packet is non-empty, and to 0 if it is
5338  * empty. If the function returns an error, the
5339  * packet can be assumed to be invalid, and the
5340  * value of got_packet_ptr is undefined and should
5341  * not be used.
5342  * @return 0 on success, negative error code on failure
5343  *
5344  * @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead
5345  */
5347 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
5348  const AVFrame *frame, int *got_packet_ptr);
5349 
5350 /**
5351  * Encode a frame of video.
5352  *
5353  * Takes input raw video data from frame and writes the next output packet, if
5354  * available, to avpkt. The output packet does not necessarily contain data for
5355  * the most recent frame, as encoders can delay and reorder input frames
5356  * internally as needed.
5357  *
5358  * @param avctx codec context
5359  * @param avpkt output AVPacket.
5360  * The user can supply an output buffer by setting
5361  * avpkt->data and avpkt->size prior to calling the
5362  * function, but if the size of the user-provided data is not
5363  * large enough, encoding will fail. All other AVPacket fields
5364  * will be reset by the encoder using av_init_packet(). If
5365  * avpkt->data is NULL, the encoder will allocate it.
5366  * The encoder will set avpkt->size to the size of the
5367  * output packet. The returned data (if any) belongs to the
5368  * caller, he is responsible for freeing it.
5369  *
5370  * If this function fails or produces no output, avpkt will be
5371  * freed using av_packet_unref().
5372  * @param[in] frame AVFrame containing the raw video data to be encoded.
5373  * May be NULL when flushing an encoder that has the
5374  * AV_CODEC_CAP_DELAY capability set.
5375  * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
5376  * output packet is non-empty, and to 0 if it is
5377  * empty. If the function returns an error, the
5378  * packet can be assumed to be invalid, and the
5379  * value of got_packet_ptr is undefined and should
5380  * not be used.
5381  * @return 0 on success, negative error code on failure
5382  *
5383  * @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead
5384  */
5386 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
5387  const AVFrame *frame, int *got_packet_ptr);
5388 
5389 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
5390  const AVSubtitle *sub);
5391 
5392 
5393 /**
5394  * @}
5395  */
5396 
5397 #if FF_API_AVPICTURE
5398 /**
5399  * @addtogroup lavc_picture
5400  * @{
5401  */
5402 
5403 /**
5404  * @deprecated unused
5405  */
5407 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
5408 
5409 /**
5410  * @deprecated unused
5411  */
5413 void avpicture_free(AVPicture *picture);
5414 
5415 /**
5416  * @deprecated use av_image_fill_arrays() instead.
5417  */
5419 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
5420  enum AVPixelFormat pix_fmt, int width, int height);
5421 
5422 /**
5423  * @deprecated use av_image_copy_to_buffer() instead.
5424  */
5427  int width, int height,
5428  unsigned char *dest, int dest_size);
5429 
5430 /**
5431  * @deprecated use av_image_get_buffer_size() instead.
5432  */
5435 
5436 /**
5437  * @deprecated av_image_copy() instead.
5438  */
5440 void av_picture_copy(AVPicture *dst, const AVPicture *src,
5441  enum AVPixelFormat pix_fmt, int width, int height);
5442 
5443 /**
5444  * @deprecated unused
5445  */
5447 int av_picture_crop(AVPicture *dst, const AVPicture *src,
5448  enum AVPixelFormat pix_fmt, int top_band, int left_band);
5449 
5450 /**
5451  * @deprecated unused
5452  */
5454 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
5455  int padtop, int padbottom, int padleft, int padright, int *color);
5456 
5457 /**
5458  * @}
5459  */
5460 #endif
5461 
5462 /**
5463  * @defgroup lavc_misc Utility functions
5464  * @ingroup libavc
5465  *
5466  * Miscellaneous utility functions related to both encoding and decoding
5467  * (or neither).
5468  * @{
5469  */
5470 
5471 /**
5472  * @defgroup lavc_misc_pixfmt Pixel formats
5473  *
5474  * Functions for working with pixel formats.
5475  * @{
5476  */
5477 
5478 #if FF_API_GETCHROMA
5479 /**
5480  * @deprecated Use av_pix_fmt_get_chroma_sub_sample
5481  */
5482 
5484 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
5485 #endif
5486 
5487 /**
5488  * Return a value representing the fourCC code associated to the
5489  * pixel format pix_fmt, or 0 if no associated fourCC code can be
5490  * found.
5491  */
5493 
5494 /**
5495  * @deprecated see av_get_pix_fmt_loss()
5496  */
5497 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
5498  int has_alpha);
5499 
5500 /**
5501  * Find the best pixel format to convert to given a certain source pixel
5502  * format. When converting from one pixel format to another, information loss
5503  * may occur. For example, when converting from RGB24 to GRAY, the color
5504  * information will be lost. Similarly, other losses occur when converting from
5505  * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
5506  * the given pixel formats should be used to suffer the least amount of loss.
5507  * The pixel formats from which it chooses one, are determined by the
5508  * pix_fmt_list parameter.
5509  *
5510  *
5511  * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
5512  * @param[in] src_pix_fmt source pixel format
5513  * @param[in] has_alpha Whether the source pixel format alpha channel is used.
5514  * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
5515  * @return The best pixel format to convert to or -1 if none was found.
5516  */
5517 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
5518  enum AVPixelFormat src_pix_fmt,
5519  int has_alpha, int *loss_ptr);
5520 
5521 /**
5522  * @deprecated see av_find_best_pix_fmt_of_2()
5523  */
5524 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
5525  enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
5526 
5528 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
5529  enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
5530 
5532 
5533 /**
5534  * @}
5535  */
5536 
5537 #if FF_API_TAG_STRING
5538 /**
5539  * Put a string representing the codec tag codec_tag in buf.
5540  *
5541  * @param buf buffer to place codec tag in
5542  * @param buf_size size in bytes of buf
5543  * @param codec_tag codec tag to assign
5544  * @return the length of the string that would have been generated if
5545  * enough space had been available, excluding the trailing null
5546  *
5547  * @deprecated see av_fourcc_make_string() and av_fourcc2str().
5548  */
5550 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
5551 #endif
5552 
5553 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
5554 
5555 /**
5556  * Return a name for the specified profile, if available.
5557  *
5558  * @param codec the codec that is searched for the given profile
5559  * @param profile the profile value for which a name is requested
5560  * @return A name for the profile if found, NULL otherwise.
5561  */
5562 const char *av_get_profile_name(const AVCodec *codec, int profile);
5563 
5564 /**
5565  * Return a name for the specified profile, if available.
5566  *
5567  * @param codec_id the ID of the codec to which the requested profile belongs
5568  * @param profile the profile value for which a name is requested
5569  * @return A name for the profile if found, NULL otherwise.
5570  *
5571  * @note unlike av_get_profile_name(), which searches a list of profiles
5572  * supported by a specific decoder or encoder implementation, this
5573  * function searches the list of profiles from the AVCodecDescriptor
5574  */
5575 const char *avcodec_profile_name(enum AVCodecID codec_id, int profile);
5576 
5577 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
5578 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
5579 //FIXME func typedef
5580 
5581 /**
5582  * Fill AVFrame audio data and linesize pointers.
5583  *
5584  * The buffer buf must be a preallocated buffer with a size big enough
5585  * to contain the specified samples amount. The filled AVFrame data
5586  * pointers will point to this buffer.
5587  *
5588  * AVFrame extended_data channel pointers are allocated if necessary for
5589  * planar audio.
5590  *
5591  * @param frame the AVFrame
5592  * frame->nb_samples must be set prior to calling the
5593  * function. This function fills in frame->data,
5594  * frame->extended_data, frame->linesize[0].
5595  * @param nb_channels channel count
5596  * @param sample_fmt sample format
5597  * @param buf buffer to use for frame data
5598  * @param buf_size size of buffer
5599  * @param align plane size sample alignment (0 = default)
5600  * @return >=0 on success, negative error code on failure
5601  * @todo return the size in bytes required to store the samples in
5602  * case of success, at the next libavutil bump
5603  */
5605  enum AVSampleFormat sample_fmt, const uint8_t *buf,
5606  int buf_size, int align);
5607 
5608 /**
5609  * Reset the internal decoder state / flush internal buffers. Should be called
5610  * e.g. when seeking or when switching to a different stream.
5611  *
5612  * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
5613  * this invalidates the frames previously returned from the decoder. When
5614  * refcounted frames are used, the decoder just releases any references it might
5615  * keep internally, but the caller's reference remains valid.
5616  */
5618 
5619 /**
5620  * Return codec bits per sample.
5621  *
5622  * @param[in] codec_id the codec
5623  * @return Number of bits per sample or zero if unknown for the given codec.
5624  */
5626 
5627 /**
5628  * Return the PCM codec associated with a sample format.
5629  * @param be endianness, 0 for little, 1 for big,
5630  * -1 (or anything else) for native
5631  * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
5632  */
5633 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
5634 
5635 /**
5636  * Return codec bits per sample.
5637  * Only return non-zero if the bits per sample is exactly correct, not an
5638  * approximation.
5639  *
5640  * @param[in] codec_id the codec
5641  * @return Number of bits per sample or zero if unknown for the given codec.
5642  */
5644 
5645 /**
5646  * Return audio frame duration.
5647  *
5648  * @param avctx codec context
5649  * @param frame_bytes size of the frame, or 0 if unknown
5650  * @return frame duration, in samples, if known. 0 if not able to
5651  * determine.
5652  */
5653 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
5654 
5655 /**
5656  * This function is the same as av_get_audio_frame_duration(), except it works
5657  * with AVCodecParameters instead of an AVCodecContext.
5658  */
5659 int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes);
5660 
5661 #if FF_API_OLD_BSF
5663  void *priv_data;
5664  const struct AVBitStreamFilter *filter;
5667  /**
5668  * Internal default arguments, used if NULL is passed to av_bitstream_filter_filter().
5669  * Not for access by library users.
5670  */
5671  char *args;
5673 #endif
5674 
5675 typedef struct AVBSFInternal AVBSFInternal;
5676 
5677 /**
5678  * The bitstream filter state.
5679  *
5680  * This struct must be allocated with av_bsf_alloc() and freed with
5681  * av_bsf_free().
5682  *
5683  * The fields in the struct will only be changed (by the caller or by the
5684  * filter) as described in their documentation, and are to be considered
5685  * immutable otherwise.
5686  */
5687 typedef struct AVBSFContext {
5688  /**
5689  * A class for logging and AVOptions
5690  */
5692 
5693  /**
5694  * The bitstream filter this context is an instance of.
5695  */
5696  const struct AVBitStreamFilter *filter;
5697 
5698  /**
5699  * Opaque libavcodec internal data. Must not be touched by the caller in any
5700  * way.
5701  */
5702  AVBSFInternal *internal;
5703 
5704  /**
5705  * Opaque filter-specific private data. If filter->priv_class is non-NULL,
5706  * this is an AVOptions-enabled struct.
5707  */
5708  void *priv_data;
5709 
5710  /**
5711  * Parameters of the input stream. This field is allocated in
5712  * av_bsf_alloc(), it needs to be filled by the caller before
5713  * av_bsf_init().
5714  */
5716 
5717  /**
5718  * Parameters of the output stream. This field is allocated in
5719  * av_bsf_alloc(), it is set by the filter in av_bsf_init().
5720  */
5722 
5723  /**
5724  * The timebase used for the timestamps of the input packets. Set by the
5725  * caller before av_bsf_init().
5726  */
5728 
5729  /**
5730  * The timebase used for the timestamps of the output packets. Set by the
5731  * filter in av_bsf_init().
5732  */
5734 } AVBSFContext;
5735 
5736 typedef struct AVBitStreamFilter {
5737  const char *name;
5738 
5739  /**
5740  * A list of codec ids supported by the filter, terminated by
5741  * AV_CODEC_ID_NONE.
5742  * May be NULL, in that case the bitstream filter works with any codec id.
5743  */
5744  const enum AVCodecID *codec_ids;
5745 
5746  /**
5747  * A class for the private data, used to declare bitstream filter private
5748  * AVOptions. This field is NULL for bitstream filters that do not declare
5749  * any options.
5750  *
5751  * If this field is non-NULL, the first member of the filter private data
5752  * must be a pointer to AVClass, which will be set by libavcodec generic
5753  * code to this class.
5754  */
5756 
5757  /*****************************************************************
5758  * No fields below this line are part of the public API. They
5759  * may not be used outside of libavcodec and can be changed and
5760  * removed at will.
5761  * New public fields should be added right above.
5762  *****************************************************************
5763  */
5764 
5768  void (*close)(AVBSFContext *ctx);
5770 
5771 #if FF_API_OLD_BSF
5772 /**
5773  * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5774  * is deprecated. Use the new bitstream filtering API (using AVBSFContext).
5775  */
5778 /**
5779  * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5780  * is deprecated. Use av_bsf_get_by_name(), av_bsf_alloc(), and av_bsf_init()
5781  * from the new bitstream filtering API (using AVBSFContext).
5782  */
5785 /**
5786  * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5787  * is deprecated. Use av_bsf_send_packet() and av_bsf_receive_packet() from the
5788  * new bitstream filtering API (using AVBSFContext).
5789  */
5792  AVCodecContext *avctx, const char *args,
5793  uint8_t **poutbuf, int *poutbuf_size,
5794  const uint8_t *buf, int buf_size, int keyframe);
5795 /**
5796  * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5797  * is deprecated. Use av_bsf_free() from the new bitstream filtering API (using
5798  * AVBSFContext).
5799  */
5802 /**
5803  * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5804  * is deprecated. Use av_bsf_iterate() from the new bitstream filtering API (using
5805  * AVBSFContext).
5806  */
5809 #endif
5810 
5811 /**
5812  * @return a bitstream filter with the specified name or NULL if no such
5813  * bitstream filter exists.
5814  */
5815 const AVBitStreamFilter *av_bsf_get_by_name(const char *name);
5816 
5817 /**
5818  * Iterate over all registered bitstream filters.
5819  *
5820  * @param opaque a pointer where libavcodec will store the iteration state. Must
5821  * point to NULL to start the iteration.
5822  *
5823  * @return the next registered bitstream filter or NULL when the iteration is
5824  * finished
5825  */
5826 const AVBitStreamFilter *av_bsf_iterate(void **opaque);
5827 #if FF_API_NEXT
5829 const AVBitStreamFilter *av_bsf_next(void **opaque);
5830 #endif
5831 
5832 /**
5833  * Allocate a context for a given bitstream filter. The caller must fill in the
5834  * context parameters as described in the documentation and then call
5835  * av_bsf_init() before sending any data to the filter.
5836  *
5837  * @param filter the filter for which to allocate an instance.
5838  * @param ctx a pointer into which the pointer to the newly-allocated context
5839  * will be written. It must be freed with av_bsf_free() after the
5840  * filtering is done.
5841  *
5842  * @return 0 on success, a negative AVERROR code on failure
5843  */
5845 
5846 /**
5847  * Prepare the filter for use, after all the parameters and options have been
5848  * set.
5849  */
5851 
5852 /**
5853  * Submit a packet for filtering.
5854  *
5855  * After sending each packet, the filter must be completely drained by calling
5856  * av_bsf_receive_packet() repeatedly until it returns AVERROR(EAGAIN) or
5857  * AVERROR_EOF.
5858  *
5859  * @param pkt the packet to filter. The bitstream filter will take ownership of
5860  * the packet and reset the contents of pkt. pkt is not touched if an error occurs.
5861  * This parameter may be NULL, which signals the end of the stream (i.e. no more
5862  * packets will be sent). That will cause the filter to output any packets it
5863  * may have buffered internally.
5864  *
5865  * @return 0 on success, a negative AVERROR on error.
5866  */
5868 
5869 /**
5870  * Retrieve a filtered packet.
5871  *
5872  * @param[out] pkt this struct will be filled with the contents of the filtered
5873  * packet. It is owned by the caller and must be freed using
5874  * av_packet_unref() when it is no longer needed.
5875  * This parameter should be "clean" (i.e. freshly allocated
5876  * with av_packet_alloc() or unreffed with av_packet_unref())
5877  * when this function is called. If this function returns
5878  * successfully, the contents of pkt will be completely
5879  * overwritten by the returned data. On failure, pkt is not
5880  * touched.
5881  *
5882  * @return 0 on success. AVERROR(EAGAIN) if more packets need to be sent to the
5883  * filter (using av_bsf_send_packet()) to get more output. AVERROR_EOF if there
5884  * will be no further output from the filter. Another negative AVERROR value if
5885  * an error occurs.
5886  *
5887  * @note one input packet may result in several output packets, so after sending
5888  * a packet with av_bsf_send_packet(), this function needs to be called
5889  * repeatedly until it stops returning 0. It is also possible for a filter to
5890  * output fewer packets than were sent to it, so this function may return
5891  * AVERROR(EAGAIN) immediately after a successful av_bsf_send_packet() call.
5892  */
5894 
5895 /**
5896  * Free a bitstream filter context and everything associated with it; write NULL
5897  * into the supplied pointer.
5898  */
5899 void av_bsf_free(AVBSFContext **ctx);
5900 
5901 /**
5902  * Get the AVClass for AVBSFContext. It can be used in combination with
5903  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
5904  *
5905  * @see av_opt_find().
5906  */
5907 const AVClass *av_bsf_get_class(void);
5908 
5909 /**
5910  * Structure for chain/list of bitstream filters.
5911  * Empty list can be allocated by av_bsf_list_alloc().
5912  */
5913 typedef struct AVBSFList AVBSFList;
5914 
5915 /**
5916  * Allocate empty list of bitstream filters.
5917  * The list must be later freed by av_bsf_list_free()
5918  * or finalized by av_bsf_list_finalize().
5919  *
5920  * @return Pointer to @ref AVBSFList on success, NULL in case of failure
5921  */
5923 
5924 /**
5925  * Free list of bitstream filters.
5926  *
5927  * @param lst Pointer to pointer returned by av_bsf_list_alloc()
5928  */
5929 void av_bsf_list_free(AVBSFList **lst);
5930 
5931 /**
5932  * Append bitstream filter to the list of bitstream filters.
5933  *
5934  * @param lst List to append to
5935  * @param bsf Filter context to be appended
5936  *
5937  * @return >=0 on success, negative AVERROR in case of failure
5938  */
5939 int av_bsf_list_append(AVBSFList *lst, AVBSFContext *bsf);
5940 
5941 /**
5942  * Construct new bitstream filter context given it's name and options
5943  * and append it to the list of bitstream filters.
5944  *
5945  * @param lst List to append to
5946  * @param bsf_name Name of the bitstream filter
5947  * @param options Options for the bitstream filter, can be set to NULL
5948  *
5949  * @return >=0 on success, negative AVERROR in case of failure
5950  */
5951 int av_bsf_list_append2(AVBSFList *lst, const char * bsf_name, AVDictionary **options);
5952 /**
5953  * Finalize list of bitstream filters.
5954  *
5955  * This function will transform @ref AVBSFList to single @ref AVBSFContext,
5956  * so the whole chain of bitstream filters can be treated as single filter
5957  * freshly allocated by av_bsf_alloc().
5958  * If the call is successful, @ref AVBSFList structure is freed and lst
5959  * will be set to NULL. In case of failure, caller is responsible for
5960  * freeing the structure by av_bsf_list_free()
5961  *
5962  * @param lst Filter list structure to be transformed
5963  * @param[out] bsf Pointer to be set to newly created @ref AVBSFContext structure
5964  * representing the chain of bitstream filters
5965  *
5966  * @return >=0 on success, negative AVERROR in case of failure
5967  */
5968 int av_bsf_list_finalize(AVBSFList **lst, AVBSFContext **bsf);
5969 
5970 /**
5971  * Parse string describing list of bitstream filters and create single
5972  * @ref AVBSFContext describing the whole chain of bitstream filters.
5973  * Resulting @ref AVBSFContext can be treated as any other @ref AVBSFContext freshly
5974  * allocated by av_bsf_alloc().
5975  *
5976  * @param str String describing chain of bitstream filters in format
5977  * `bsf1[=opt1=val1:opt2=val2][,bsf2]`
5978  * @param[out] bsf Pointer to be set to newly created @ref AVBSFContext structure
5979  * representing the chain of bitstream filters
5980  *
5981  * @return >=0 on success, negative AVERROR in case of failure
5982  */
5983 int av_bsf_list_parse_str(const char *str, AVBSFContext **bsf);
5984 
5985 /**
5986  * Get null/pass-through bitstream filter.
5987  *
5988  * @param[out] bsf Pointer to be set to new instance of pass-through bitstream filter
5989  *
5990  * @return
5991  */
5993 
5994 /* memory */
5995 
5996 /**
5997  * Same behaviour av_fast_malloc but the buffer has additional
5998  * AV_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
5999  *
6000  * In addition the whole buffer will initially and after resizes
6001  * be 0-initialized so that no uninitialized data will ever appear.
6002  */
6003 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
6004 
6005 /**
6006  * Same behaviour av_fast_padded_malloc except that buffer will always
6007  * be 0-initialized after call.
6008  */
6009 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
6010 
6011 /**
6012  * Encode extradata length to a buffer. Used by xiph codecs.
6013  *
6014  * @param s buffer to write to; must be at least (v/255+1) bytes long
6015  * @param v size of extradata in bytes
6016  * @return number of bytes written to the buffer.
6017  */
6018 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
6019 
6020 #if FF_API_USER_VISIBLE_AVHWACCEL
6021 /**
6022  * Register the hardware accelerator hwaccel.
6023  *
6024  * @deprecated This function doesn't do anything.
6025  */
6027 void av_register_hwaccel(AVHWAccel *hwaccel);
6028 
6029 /**
6030  * If hwaccel is NULL, returns the first registered hardware accelerator,
6031  * if hwaccel is non-NULL, returns the next registered hardware accelerator
6032  * after hwaccel, or NULL if hwaccel is the last one.
6033  *
6034  * @deprecated AVHWaccel structures contain no user-serviceable parts, so
6035  * this function should not be used.
6036  */
6038 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
6039 #endif
6040 
6041 #if FF_API_LOCKMGR
6042 /**
6043  * Lock operation used by lockmgr
6044  *
6045  * @deprecated Deprecated together with av_lockmgr_register().
6046  */
6047 enum AVLockOp {
6048  AV_LOCK_CREATE, ///< Create a mutex
6049  AV_LOCK_OBTAIN, ///< Lock the mutex
6050  AV_LOCK_RELEASE, ///< Unlock the mutex
6051  AV_LOCK_DESTROY, ///< Free mutex resources
6052 };
6053 
6054 /**
6055  * Register a user provided lock manager supporting the operations
6056  * specified by AVLockOp. The "mutex" argument to the function points
6057  * to a (void *) where the lockmgr should store/get a pointer to a user
6058  * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
6059  * value left by the last call for all other ops. If the lock manager is
6060  * unable to perform the op then it should leave the mutex in the same
6061  * state as when it was called and return a non-zero value. However,
6062  * when called with AV_LOCK_DESTROY the mutex will always be assumed to
6063  * have been successfully destroyed. If av_lockmgr_register succeeds
6064  * it will return a non-negative value, if it fails it will return a
6065  * negative value and destroy all mutex and unregister all callbacks.
6066  * av_lockmgr_register is not thread-safe, it must be called from a
6067  * single thread before any calls which make use of locking are used.
6068  *
6069  * @param cb User defined callback. av_lockmgr_register invokes calls
6070  * to this callback and the previously registered callback.
6071  * The callback will be used to create more than one mutex
6072  * each of which must be backed by its own underlying locking
6073  * mechanism (i.e. do not use a single static object to
6074  * implement your lock manager). If cb is set to NULL the
6075  * lockmgr will be unregistered.
6076  *
6077  * @deprecated This function does nothing, and always returns 0. Be sure to
6078  * build with thread support to get basic thread safety.
6079  */
6081 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
6082 #endif
6083 
6084 /**
6085  * Get the type of the given codec.
6086  */
6088 
6089 /**
6090  * Get the name of a codec.
6091  * @return a static string identifying the codec; never NULL
6092  */
6093 const char *avcodec_get_name(enum AVCodecID id);
6094 
6095 /**
6096  * @return a positive value if s is open (i.e. avcodec_open2() was called on it
6097  * with no corresponding avcodec_close()), 0 otherwise.
6098  */
6100 
6101 /**
6102  * @return a non-zero number if codec is an encoder, zero otherwise
6103  */
6104 int av_codec_is_encoder(const AVCodec *codec);
6105 
6106 /**
6107  * @return a non-zero number if codec is a decoder, zero otherwise
6108  */
6109 int av_codec_is_decoder(const AVCodec *codec);
6110 
6111 /**
6112  * @return descriptor for given codec ID or NULL if no descriptor exists.
6113  */
6115 
6116 /**
6117  * Iterate over all codec descriptors known to libavcodec.
6118  *
6119  * @param prev previous descriptor. NULL to get the first descriptor.
6120  *
6121  * @return next descriptor or NULL after the last descriptor
6122  */
6124 
6125 /**
6126  * @return codec descriptor with the given name or NULL if no such descriptor
6127  * exists.
6128  */
6130 
6131 /**
6132  * Allocate a CPB properties structure and initialize its fields to default
6133  * values.
6134  *
6135  * @param size if non-NULL, the size of the allocated struct will be written
6136  * here. This is useful for embedding it in side data.
6137  *
6138  * @return the newly allocated struct or NULL on failure
6139  */
6141 
6142 /**
6143  * @}
6144  */
6145 
6146 #endif /* AVCODEC_AVCODEC_H */
codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it ...
Definition: avcodec.h:684
int caps_internal
Internal hwaccel capabilities.
Definition: avcodec.h:3725
attribute_deprecated int av_packet_split_side_data(AVPacket *pkt)
Definition: avpacket.c:434
void av_bsf_free(AVBSFContext **ctx)
Free a bitstream filter context and everything associated with it; write NULL into the supplied point...
Definition: bsf.c:35
const struct AVCodec * codec
Definition: avcodec.h:1527
AVRational framerate
Definition: avcodec.h:3040
const char const char void * val
Definition: avisynth_c.h:771
discard all frames except keyframes
Definition: avcodec.h:793
AVSideDataParamChangeFlags
Definition: avcodec.h:1484
const AVCodecDescriptor * codec_descriptor
AVCodecDescriptor.
Definition: avcodec.h:3061
const char * s
Definition: avisynth_c.h:768
const AVClass * priv_class
A class for the private data, used to declare bitstream filter private AVOptions. ...
Definition: avcodec.h:5755
static enum AVPixelFormat pix_fmt
AVCodecParameters * par_out
Parameters of the output stream.
Definition: avcodec.h:5721
#define AV_NUM_DATA_POINTERS
Definition: frame.h:219
AVPacketSideDataType
Definition: avcodec.h:1143
static AVMutex mutex
Definition: log.c:44
int64_t pts_correction_num_faulty_dts
Number of incorrect PTS values so far.
Definition: avcodec.h:3078
A list of zero terminated key/value strings.
Definition: avcodec.h:1312
int size
This structure describes decoded (raw) audio or video data.
Definition: frame.h:218
The optional first identifier line of a WebVTT cue.
Definition: avcodec.h:1299
int avcodec_default_execute2(AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2, int, int), void *arg, int *ret, int count)
AVCodec * avcodec_find_encoder(enum AVCodecID id)
Find a registered encoder with a matching codec ID.
Definition: allcodecs.c:857
int x
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:3826
int dct_algo
DCT algorithm, see FF_DCT_* below.
Definition: avcodec.h:2700
A dummy id pointing at the start of audio codecs.
Definition: avcodec.h:451
static void flush(AVCodecContext *avctx)
int apply_cropping
Video decoding only.
Definition: avcodec.h:3285
const struct AVCodecHWConfigInternal ** hw_configs
Array of pointers to hardware configurations supported by the codec, or NULL if no hardware supported...
Definition: avcodec.h:3549
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:1705
int capabilities
Hardware accelerated codec capabilities.
Definition: avcodec.h:3609
const char * fmt
Definition: avisynth_c.h:769
attribute_deprecated void av_register_codec_parser(AVCodecParser *parser)
Definition: parser.c:114
float qblur
amount of qscale smoothing over time (0.0-1.0)
Definition: avcodec.h:2348
Unlock the mutex.
Definition: avcodec.h:6050
static int init_thread_copy(AVCodecContext *avctx)
Definition: tta.c:392
int64_t bit_rate
the average bitrate
Definition: avcodec.h:1568
static void draw_horiz_band(AVCodecContext *ctx, const AVFrame *fr, int offset[4], int slice_position, int type, int height)
Definition: api-band-test.c:36
The codec supports this format by some internal method.
Definition: avcodec.h:3370
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1450
void av_shrink_packet(AVPacket *pkt, int size)
Reduce packet size, correctly zeroing padding.
Definition: avpacket.c:101
attribute_deprecated AVCodec * av_codec_next(const AVCodec *c)
If c is NULL, returns the first registered codec, if c is non-NULL, returns the next registered codec...
Definition: allcodecs.c:810
Subtitle event position.
Definition: avcodec.h:1286
int64_t next_frame_offset
Definition: avcodec.h:5038
const char * desc
Definition: nvenc.c:65
int id
id
Definition: avcodec.h:1076
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
static int decode_slice(AVCodecContext *c, void *arg)
Definition: ffv1dec.c:246
int max_bitrate
Maximum bitrate of the stream, in bits per second.
Definition: avcodec.h:1104
int max_b_frames
maximum number of B-frames between non-B-frames Note: The output will be delayed by max_b_frames+1 re...
Definition: avcodec.h:1777
AVRational sample_aspect_ratio
Video only.
Definition: avcodec.h:3960
int rc_initial_buffer_occupancy
Number of bits which should be loaded into the rc buffer before decoding starts.
Definition: avcodec.h:2419
Dummy codec for streams containing only metadata information.
Definition: avcodec.h:690
int height
Definition: avcodec.h:1084
int width
Dimensions of the decoded video intended for presentation.
Definition: avcodec.h:5179
int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt)
Read encoded data from the encoder.
Definition: encode.c:420
attribute_deprecated int frame_skip_cmp
Definition: avcodec.h:2454
This side data should be associated with a video stream and contains Stereoscopic 3D information in f...
Definition: avcodec.h:1217
const char * avcodec_configuration(void)
Return the libavcodec build-time configuration.
Definition: utils.c:1402
ATSC A53 Part 4 Closed Captions.
Definition: avcodec.h:1345
attribute_deprecated int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe)
const struct AVBitStreamFilter * filter
The bitstream filter this context is an instance of.
Definition: avcodec.h:5696
int qscale
Definition: avcodec.h:816
attribute_deprecated const AVBitStreamFilter * av_bsf_next(void **opaque)
attribute_deprecated int av_picture_crop(AVPicture *dst, const AVPicture *src, enum AVPixelFormat pix_fmt, int top_band, int left_band)
Definition: imgconvert.c:107
The bitstream filter state.
Definition: avcodec.h:5687
int nb_colors
number of colors in pict, undefined when pict is not set
Definition: avcodec.h:3830
int size
Definition: avcodec.h:1431
int mb_lmin
minimum MB Lagrange multiplier
Definition: avcodec.h:2060
const char * avcodec_license(void)
Return the libavcodec license.
Definition: utils.c:1407
const AVBitStreamFilter * av_bsf_get_by_name(const char *name)
int coded_width
Dimensions of the coded video.
Definition: avcodec.h:5185
This side data contains an integer value representing the stream index of a "fallback" track...
Definition: avcodec.h:1243
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...
Definition: avcodec.h:1896
Structure for chain/list of bitstream filters.
Definition: bsf.c:394
attribute_deprecated int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Encode a frame of audio.
Definition: encode.c:118
enum AVMediaType codec_type
Definition: rtp.c:37
Convenience header that includes libavutil&#39;s core.
attribute_deprecated int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, const AVPacket *avpkt)
Decode the audio frame of size avpkt->size from avpkt->data into frame.
Definition: decode.c:833
Contain timestamp estimated through PCR of program stream.
Definition: avcodec.h:673
unsigned num_rects
Definition: avcodec.h:3864
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
Definition: utils.c:70
A dummy ID pointing at the start of various fake codecs.
Definition: avcodec.h:670
color_range
char * stats_in
pass2 encoding statistics input buffer Concatenated stuff from stats_out of pass1 should be placed he...
Definition: avcodec.h:2540
int ildct_cmp
interlaced DCT comparison function
Definition: avcodec.h:1921
discard all non intra frames
Definition: avcodec.h:792
int duration
Duration of the current frame.
Definition: avcodec.h:5154
discard all
Definition: avcodec.h:794
attribute_deprecated void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
Definition: imgconvert.c:38
static AVPacket pkt
static CopyRet receive_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame)
Definition: crystalhd.c:560
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:2741
attribute_deprecated int av_lockmgr_register(int(*cb)(void **mutex, enum AVLockOp op))
Register a user provided lock manager supporting the operations specified by AVLockOp.
Definition: utils.c:1770
int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos)
Converts AVChromaLocation to swscale x/y chroma position.
Definition: utils.c:349
int dts_ref_dts_delta
Offset of the current timestamp against last timestamp sync point in units of AVCodecContext.time_base.
Definition: avcodec.h:5116
int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub, int *got_sub_ptr, AVPacket *avpkt)
Decode a subtitle message.
Definition: decode.c:998
const struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:2674
int av_bsf_get_null_filter(AVBSFContext **bsf)
Get null/pass-through bitstream filter.
Definition: bsf.c:544
int trailing_padding
Audio only.
Definition: avcodec.h:4020
void * priv_data
Opaque filter-specific private data.
Definition: avcodec.h:5708
Picture data structure.
Definition: avcodec.h:3793
#define src
Definition: vp8dsp.c:254
int profile
profile
Definition: avcodec.h:2843
const AVCodec * av_codec_iterate(void **opaque)
Iterate over all registered codecs.
Definition: allcodecs.c:775
An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of structures with info about macroblo...
Definition: avcodec.h:1196
AVCodec.
Definition: avcodec.h:3408
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:2210
attribute_deprecated int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright, int *color)
Definition: imgconvert.c:138
float i_quant_offset
qscale offset between P and I-frames
Definition: avcodec.h:1829
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
attribute_deprecated int av_codec_get_seek_preroll(const AVCodecContext *avctx)
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3876
int av_bsf_init(AVBSFContext *ctx)
Prepare the filter for use, after all the parameters and options have been set.
Definition: bsf.c:134
AVLockOp
Lock operation used by lockmgr.
Definition: avcodec.h:6047
attribute_deprecated AVPicture pict
Definition: avcodec.h:3837
AVColorTransferCharacteristic
Color Transfer Characteristic.
Definition: pixfmt.h:444
int min_bitrate
Minimum bitrate of the stream, in bits per second.
Definition: avcodec.h:1109
char * text
0 terminated plain UTF-8 text
Definition: avcodec.h:3848
attribute_deprecated int frame_skip_exp
Definition: avcodec.h:2450
attribute_deprecated int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height)
Definition: avpicture.c:57
Macro definitions for various function/variable attributes.
const AVBitStreamFilter * av_bsf_iterate(void **opaque)
Iterate over all registered bitstream filters.
int frame_size
Audio only.
Definition: avcodec.h:4005
Mastering display metadata (based on SMPTE-2086:2014).
Definition: avcodec.h:1325
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1640
int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt, int has_alpha)
Definition: imgconvert.c:47
int av_codec_is_decoder(const AVCodec *codec)
Definition: utils.c:99
AVSubtitleRect ** rects
Definition: avcodec.h:3865
enum AVAudioServiceType audio_service_type
Type of service that the audio stream conveys.
Definition: avcodec.h:2238
const AVCodecDescriptor * avcodec_descriptor_next(const AVCodecDescriptor *prev)
Iterate over all codec descriptors known to libavcodec.
Definition: codec_desc.c:3141
void av_bsf_list_free(AVBSFList **lst)
Free list of bitstream filters.
Definition: bsf.c:404
int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels, enum AVSampleFormat sample_fmt, const uint8_t *buf, int buf_size, int align)
Fill AVFrame audio data and linesize pointers.
Definition: utils.c:372
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:2975
static HEVCFrame * alloc_frame(HEVCContext *s)
Definition: hevc_refs.c:82
const AVClass * avcodec_get_class(void)
Get the AVClass for AVCodecContext.
Definition: options.c:294
int av_codec_is_encoder(const AVCodec *codec)
Definition: utils.c:94
uint64_t vbv_delay
The delay between the time the packet this structure is associated with is received and the time when...
Definition: avcodec.h:1129
int av_bsf_alloc(const AVBitStreamFilter *filter, AVBSFContext **ctx)
Allocate a context for a given bitstream filter.
Definition: bsf.c:81
void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
Modify width and height values so that they will result in a memory buffer that is acceptable for the...
Definition: utils.c:334
int w
width of pict, undefined when pict is not set
Definition: avcodec.h:3828
attribute_deprecated int mv_bits
Definition: avcodec.h:2506
float p_masking
p block masking (0-> disabled)
Definition: avcodec.h:1857
AVCodecParserContext * parser
Definition: avcodec.h:5665
attribute_deprecated const AVBitStreamFilter * av_bitstream_filter_next(const AVBitStreamFilter *f)
Public dictionary API.
static double cb(void *priv, double x, double y)
Definition: vf_geq.c:112
int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt)
Retrieve a filtered packet.
Definition: bsf.c:201
static void filter(int16_t *output, ptrdiff_t out_stride, int16_t *low, ptrdiff_t low_stride, int16_t *high, ptrdiff_t high_stride, int len, int clip)
Definition: cfhd.c:114
attribute_deprecated int side_data_only_packets
Encoding only and set by default.
Definition: avcodec.h:3013
int bit_rate_tolerance
number of bits the bitstream is allowed to diverge from the reference.
Definition: avcodec.h:1576
int mb_lmax
maximum MB Lagrange multiplier
Definition: avcodec.h:2067
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
Definition: avpacket.c:62
enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
Definition: decode.c:1087
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:2181
Lock the mutex.
Definition: avcodec.h:6049
uint8_t
void * hwaccel_context
Hardware accelerator context.
Definition: avcodec.h:2686
int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict)
Unpack a dictionary from side_data.
Definition: avpacket.c:517
int width
Video only.
Definition: avcodec.h:3950
int av_parser_change(AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe)
Definition: parser.c:274
static av_cold int uninit(AVCodecContext *avctx)
Definition: crystalhd.c:279
attribute_deprecated int av_packet_merge_side_data(AVPacket *pkt)
Definition: avpacket.c:399
int subtitle_header_size
Definition: avcodec.h:2986
AVCodecParameters * avcodec_parameters_alloc(void)
Allocate a new AVCodecParameters and set its fields to default values (unknown/invalid/0).
Definition: utils.c:1982
int me_range
maximum motion estimation search range in subpel units If 0 then no limit.
Definition: avcodec.h:1988
attribute_deprecated int i_count
Definition: avcodec.h:2514
AVColorSpace
YUV colorspace type.
Definition: pixfmt.h:473
unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt)
Return a value representing the fourCC code associated to the pixel format pix_fmt, or 0 if no associated fourCC code can be found.
Definition: raw.c:298
uint16_t * chroma_intra_matrix
custom intra quantization matrix
Definition: avcodec.h:3139
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1448
This side data contains a 3x3 transformation matrix describing an affine transformation that needs to...
Definition: avcodec.h:1211
float b_quant_factor
qscale factor between IP and B-frames If > 0 then the last P-frame quantizer will be used (q= lastp_q...
Definition: avcodec.h:1786
int trailing_padding
Audio only.
Definition: avcodec.h:3219
int pre_dia_size
ME prepass diamond size & shape.
Definition: avcodec.h:1972
int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size)
Initialize a reference-counted packet from av_malloc()ed data.
Definition: avpacket.c:152
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1618
const AVClass * av_class
information on struct for av_log
Definition: avcodec.h:1523
int me_cmp
motion estimation comparison function
Definition: avcodec.h:1903
int avcodec_parameters_to_context(AVCodecContext *codec, const AVCodecParameters *par)
Fill the codec context based on the values from the supplied codec parameters.
Definition: utils.c:2078
static AVFrame * frame
struct AVCodecParser * next
Definition: avcodec.h:5211
int initial_padding
Audio only.
Definition: avcodec.h:4013
const char data[16]
Definition: mxf.c:90
const char * name
Definition: avcodec.h:5737
#define height
uint8_t * data
Definition: avcodec.h:1430
This side data is encryption initialization data.
Definition: avcodec.h:1352
attribute_deprecated int context_model
Definition: avcodec.h:2436
void av_packet_move_ref(AVPacket *dst, AVPacket *src)
Move every field in src to dst and reset src.
Definition: avpacket.c:647
static int flags
Definition: log.c:55
uint8_t * data
Definition: avcodec.h:1374
attribute_deprecated void avcodec_register(AVCodec *codec)
Register the codec codec and initialize libavcodec.
Definition: allcodecs.c:805
int lowres
low resolution decoding, 1-> 1/2 size, 2->1/4 size
Definition: avcodec.h:2749
attribute_deprecated int av_codec_get_max_lowres(const AVCodec *codec)
Definition: utils.c:480
AVColorRange
MPEG vs JPEG YUV range.
Definition: pixfmt.h:496
const AVClass * avcodec_get_frame_class(void)
Get the AVClass for AVFrame.
Definition: options.c:321
int buffer_size
The size of the buffer to which the ratecontrol is applied, in bits.
Definition: avcodec.h:1120
int h
height of pict, undefined when pict is not set
Definition: avcodec.h:3829
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2734
float lumi_masking
luminance masking (0-> disabled)
Definition: avcodec.h:1836
char * stats_out
pass1 encoding statistics output buffer
Definition: avcodec.h:2532
AVColorPrimaries
Chromaticity coordinates of the source primaries.
Definition: pixfmt.h:420
AVCPBProperties * av_cpb_properties_alloc(size_t *size)
Allocate a CPB properties structure and initialize its fields to default values.
Definition: utils.c:1922
struct AVBitStreamFilterContext * next
Definition: avcodec.h:5666
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:2155
attribute_deprecated int frame_skip_threshold
Definition: avcodec.h:2442
attribute_deprecated void av_codec_set_seek_preroll(AVCodecContext *avctx, int val)
uint64_t channel_layout
Audio only.
Definition: avcodec.h:3986
float quality_factor
Definition: avcodec.h:817
attribute_deprecated void avcodec_register_all(void)
Register all the codecs, parsers and bitstream filters which were enabled at configuration time...
Definition: allcodecs.c:820
int av_packet_ref(AVPacket *dst, const AVPacket *src)
Setup a new reference to the data described by a given packet.
Definition: avpacket.c:601
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3913
AVCodec * avcodec_find_encoder_by_name(const char *name)
Find a registered encoder with the specified name.
Definition: allcodecs.c:885
attribute_deprecated int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src)
Copy packet side data.
Definition: avpacket.c:226
void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height, int linesize_align[AV_NUM_DATA_POINTERS])
Modify width and height values so that they will result in a memory buffer that is acceptable for the...
Definition: utils.c:154
attribute_deprecated int avpicture_fill(AVPicture *picture, const uint8_t *ptr, enum AVPixelFormat pix_fmt, int width, int height)
Definition: avpicture.c:37
int av_packet_make_writable(AVPacket *pkt)
Create a writable reference for the data described by a given packet, avoiding data copy if possible...
Definition: avpacket.c:673
attribute_deprecated int skip_count
Definition: avcodec.h:2518
attribute_deprecated void av_register_hwaccel(AVHWAccel *hwaccel)
Register the hardware accelerator hwaccel.
Definition: utils.c:1764
MPEGTS stream ID, this is required to pass the stream ID information from the demuxer to the correspo...
Definition: avcodec.h:1318
int slice_count
slice count
Definition: avcodec.h:1871
Libavcodec version macros.
int avcodec_close(AVCodecContext *avctx)
Close a given AVCodecContext and free all the data associated with it (but not the AVCodecContext its...
Definition: utils.c:1061
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:86
AVRational pkt_timebase
Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
Definition: avcodec.h:3054
const uint64_t * channel_layouts
array of support channel layouts, or NULL if unknown. array is terminated by 0
Definition: avcodec.h:3432
const AVCodecDefault * defaults
Private codec-specific defaults.
Definition: avcodec.h:3481
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:215
attribute_deprecated unsigned av_codec_get_codec_properties(const AVCodecContext *avctx)
Definition: utils.c:475
int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src)
Copy the contents of src to dst.
Definition: utils.c:2003
static int get_format(AVCodecContext *avctx, const enum AVPixelFormat *pix_fmts)
Definition: qsvdec.c:51
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:1495
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:1807
An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE bytes worth of palette...
Definition: avcodec.h:1149
AVPacket * av_packet_clone(const AVPacket *src)
Create a new packet that references the same data as src.
Definition: avpacket.c:634
int64_t pos
Byte position of currently parsed frame in stream.
Definition: avcodec.h:5142
Create a mutex.
Definition: avcodec.h:6048
void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst)
Convert valid timing fields (timestamps / durations) in a packet from one timebase to another...
Definition: avpacket.c:694
int priv_data_size
Definition: avcodec.h:5201
struct AVCodecParser * parser
Definition: avcodec.h:5034
AVAudioServiceType
Definition: avcodec.h:797
int y
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:3827
discard all bidirectional frames
Definition: avcodec.h:791
An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
Definition: avcodec.h:1175
uint8_t * av_packet_get_side_data(const AVPacket *pkt, enum AVPacketSideDataType type, int *size)
Get side information from packet.
Definition: avpacket.c:350
enum AVCodecID * codec_ids
A list of codec ids supported by the filter, terminated by AV_CODEC_ID_NONE.
Definition: avcodec.h:5744
int me_sub_cmp
subpixel motion estimation comparison function
Definition: avcodec.h:1909
void av_packet_free_side_data(AVPacket *pkt)
Convenience function to free all the side data stored.
Definition: avpacket.c:270
attribute_deprecated uint64_t vbv_delay
VBV delay coded in the last frame (in periods of a 27 MHz clock).
Definition: avcodec.h:2998
int qmax
maximum quantizer
Definition: avcodec.h:2362
enum AVSampleFormat request_sample_fmt
desired sample format
Definition: avcodec.h:2246
int skip_alpha
Skip processing alpha if supported by codec.
Definition: avcodec.h:3113
int64_t pts_correction_last_pts
Number of incorrect DTS values so far.
Definition: avcodec.h:3079
int active_thread_type
Which multithreading methods are in use by the codec.
Definition: avcodec.h:2788
int methods
Bit set of AV_CODEC_HW_CONFIG_METHOD_* flags, describing the possible setup methods which can be used...
Definition: avcodec.h:3391
attribute_deprecated int av_dup_packet(AVPacket *pkt)
Definition: avpacket.c:251
int avcodec_is_open(AVCodecContext *s)
Definition: utils.c:1861
int error_concealment
error concealment flags
Definition: avcodec.h:2588
int video_delay
Video only.
Definition: avcodec.h:3979
int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
Return decoded output data from a decoder.
Definition: decode.c:709
int capabilities
Codec capabilities.
Definition: avcodec.h:3427
int initial_padding
Audio only.
Definition: avcodec.h:3031
attribute_deprecated AVCodecParser * av_parser_next(const AVCodecParser *c)
Definition: parser.c:93
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:552
attribute_deprecated AVBitStreamFilterContext * av_bitstream_filter_init(const char *name)
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: avcodec.h:1413
const char * arg
Definition: jacosubdec.c:66
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:1598
enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
Find the best pixel format to convert to given a certain source pixel format.
Definition: imgconvert.c:66
uint16_t width
Definition: gdv.c:47
AVRational time_base_in
The timebase used for the timestamps of the input packets.
Definition: avcodec.h:5727
int log_level_offset
Definition: avcodec.h:1524
enum AVHWDeviceType device_type
Definition: hwcontext_qsv.c:76
enum AVMediaType avcodec_get_type(enum AVCodecID codec_id)
Get the type of the given codec.
Definition: codec_desc.c:3160
const char * name
Name of the codec implementation.
Definition: avcodec.h:3415
float i_quant_factor
qscale factor between P- and I-frames If > 0 then the last P-frame quantizer will be used (q = lastp_...
Definition: avcodec.h:1822
int side_data_elems
Definition: avcodec.h:1442
int width
width and height in 1/16 pel
Definition: avcodec.h:1083
int64_t max_pixels
The number of pixels per image to maximally accept.
Definition: avcodec.h:3227
int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size)
Shrink the already allocated side data buffer.
Definition: avpacket.c:542
const struct AVProfile * profiles
If non-NULL, an array of profiles recognized for this codec.
Definition: avcodec.h:726
const char * long_name
A more descriptive name for this codec.
Definition: avcodec.h:711
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
void avcodec_parameters_free(AVCodecParameters **par)
Free an AVCodecParameters instance and everything associated with it and write NULL to the supplied p...
Definition: utils.c:1992
int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes)
This function is the same as av_get_audio_frame_duration(), except it works with AVCodecParameters in...
Definition: utils.c:1709
attribute_deprecated int64_t timecode_frame_start
Definition: avcodec.h:2475
attribute_deprecated int b_sensitivity
Definition: avcodec.h:2119
int priv_data_size
Size of the private data to allocate in AVCodecInternal.hwaccel_priv_data.
Definition: avcodec.h:3720
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1436
reference-counted frame API
const AVCodecDescriptor * avcodec_descriptor_get(enum AVCodecID id)
Definition: codec_desc.c:3135
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:2224
static char * split(char *message, char delim)
Definition: af_channelmap.c:81
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3902
The codec supports this format by some ad-hoc method.
Definition: avcodec.h:3379
uint32_t end_display_time
Definition: avcodec.h:3863
int64_t pts
Same as packet pts, in AV_TIME_BASE.
Definition: avcodec.h:3866
int rc_buffer_size
decoder bitstream buffer size
Definition: avcodec.h:2376
attribute_deprecated int av_copy_packet(AVPacket *dst, const AVPacket *src)
Copy packet, including contents.
Definition: avpacket.c:262
int props
Codec properties, a combination of AV_CODEC_PROP_* flags.
Definition: avcodec.h:715
int intra_dc_precision
precision of the intra DC coefficient - 8
Definition: avcodec.h:2039
int64_t rc_min_rate
minimum bitrate
Definition: avcodec.h:2398
Not part of ABI.
Definition: avcodec.h:807
int refs
number of reference frames
Definition: avcodec.h:2101
int av_bsf_list_append(AVBSFList *lst, AVBSFContext *bsf)
Append bitstream filter to the list of bitstream filters.
Definition: bsf.c:417
int block_align
Audio only.
Definition: avcodec.h:4001
A bitmap, pict will be set.
Definition: avcodec.h:3808
int av_packet_copy_props(AVPacket *dst, const AVPacket *src)
Copy only "properties" fields from src to dst.
Definition: avpacket.c:558
int rc_override_count
ratecontrol override, see RcOverride
Definition: avcodec.h:2383
const AVClass * av_bsf_get_class(void)
Get the AVClass for AVBSFContext.
Definition: bsf.c:76
audio channel layout utility functions
enum AVPixelFormat * pix_fmts
array of supported pixel formats, or NULL if unknown, array is terminated by -1
Definition: avcodec.h:3429
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2642
const char * name
Name of the hardware accelerated codec.
Definition: avcodec.h:3582
AVPacketSideData * coded_side_data
Additional data associated with the entire coded stream.
Definition: avcodec.h:3172
attribute_deprecated int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt, int width, int height, unsigned char *dest, int dest_size)
Definition: avpicture.c:44
int av_get_exact_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:1413
attribute_deprecated int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)
Copy the settings of the source AVCodecContext into the destination AVCodecContext.
Definition: options.c:215
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:156
int av_parser_parse2(AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int64_t pts, int64_t dts, int64_t pos)
Parse a packet.
Definition: parser.c:205
This side data contains quality related information from the encoder.
Definition: avcodec.h:1235
int av_bsf_list_append2(AVBSFList *lst, const char *bsf_name, AVDictionary **options)
Construct new bitstream filter context given it&#39;s name and options and append it to the list of bitst...
Definition: bsf.c:422
int width
picture width / height.
Definition: avcodec.h:1690
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:2713
AVBufferRef * hw_frames_ctx
A reference to the AVHWFramesContext describing the input (for encoding) or output (decoding) frames...
Definition: avcodec.h:3197
int64_t offset
byte offset from starting packet start
Definition: avcodec.h:5072
attribute_deprecated void av_bitstream_filter_close(AVBitStreamFilterContext *bsf)
AVRational time_base_out
The timebase used for the timestamps of the output packets.
Definition: avcodec.h:5733
int priv_data_size
Definition: avcodec.h:3456
int profile
Definition: avcodec.h:3342
int av_packet_make_refcounted(AVPacket *pkt)
Ensure the data described by a given packet is reference counted.
Definition: avpacket.c:655
attribute_deprecated int noise_reduction
Definition: avcodec.h:2031
This side data should be associated with a video stream and corresponds to the AVSphericalMapping str...
Definition: avcodec.h:1331
int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt)
Submit a packet for filtering.
Definition: bsf.c:175
const char AVS_Value args
Definition: avisynth_c.h:780
float rc_max_available_vbv_use
Ratecontrol attempt to use, at maximum, of what can be used without an underflow. ...
Definition: avcodec.h:2405
float rc_min_vbv_overflow_use
Ratecontrol attempt to use, at least, times the amount needed to prevent a vbv overflow.
Definition: avcodec.h:2412
static int decode_mb(ASV1Context *a, int16_t block[6][64])
Definition: asvdec.c:164
static const struct ColorPrimaries color_primaries[AVCOL_PRI_NB]
AVFormatContext * ctx
Definition: movenc.c:48
void av_parser_close(AVCodecParserContext *s)
Definition: parser.c:309
attribute_deprecated int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height)
Definition: avpicture.c:52
int start_frame
Definition: avcodec.h:814
attribute_deprecated int frame_skip_factor
Definition: avcodec.h:2446
uint16_t format
Definition: avcodec.h:3861
const AVClass * avcodec_get_subtitle_rect_class(void)
Get the AVClass for AVSubtitleRect.
Definition: options.c:346
int level
level
Definition: avcodec.h:2953
const AVClass * av_class
A class for logging and AVOptions.
Definition: avcodec.h:5691
const AVProfile * profiles
array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN} ...
Definition: avcodec.h:3435
int64_t reordered_opaque
opaque 64-bit number (generally a PTS) that will be reordered and output in AVFrame.reordered_opaque
Definition: avcodec.h:2667
int ticks_per_frame
For some codecs, the time base is closer to the field rate than the frame rate.
Definition: avcodec.h:1649
const char * bsfs
Decoding only, a comma-separated list of bitstream filters to apply to packets before decoding...
Definition: avcodec.h:3540
int skip_top
Number of macroblock rows at the top which are skipped.
Definition: avcodec.h:2046
enum AVCodecID codec_id
Definition: vaapi_decode.c:362
int mb_decision
macroblock decision mode
Definition: avcodec.h:2005
int last_predictor_count
amount of previous MV predictors (2a+1 x 2a+1 square)
Definition: avcodec.h:1952
int max_qdiff
maximum quantizer difference between frames
Definition: avcodec.h:2369
Passthrough codec, AVFrames wrapped in AVPacket.
Definition: avcodec.h:691
char * sub_charenc
DTS of the last frame.
Definition: avcodec.h:3087
attribute_deprecated int coder_type
Definition: avcodec.h:2430
preferred ID for MPEG-1/2 video decoding
Definition: avcodec.h:220
const AVCodecDescriptor * avcodec_descriptor_get_by_name(const char *name)
Definition: codec_desc.c:3150
static void error(const char *err)
RcOverride * rc_override
Definition: avcodec.h:2384
int64_t last_pos
Previous frame byte position.
Definition: avcodec.h:5147
const char * avcodec_get_name(enum AVCodecID id)
Get the name of a codec.
Definition: utils.c:1127
attribute_deprecated const AVCodecDescriptor * av_codec_get_codec_descriptor(const AVCodecContext *avctx)
int thread_count
thread count is used to decide how many independent tasks should be passed to execute() ...
Definition: avcodec.h:2769
int sub_charenc_mode
Subtitles character encoding mode.
Definition: avcodec.h:3095
attribute_deprecated int max_prediction_order
Definition: avcodec.h:2471
void avcodec_flush_buffers(AVCodecContext *avctx)
Reset the internal decoder state / flush internal buffers.
Definition: decode.c:1946
FAKE codec to indicate a MPEG-4 Systems stream (only used by libavformat)
Definition: avcodec.h:688
const AVS_VideoInfo int align
Definition: avisynth_c.h:795
attribute_deprecated int i_tex_bits
Definition: avcodec.h:2510
enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
Definition: imgconvert.c:54
attribute_deprecated enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
Definition: imgconvert.c:60
Content light level (based on CTA-861.3).
Definition: avcodec.h:1338
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
Supply raw packet data as input to a decoder.
Definition: decode.c:642
int(* update_thread_context)(AVCodecContext *dst, const AVCodecContext *src)
Copy necessary context variables from a previous thread context to the current one.
Definition: avcodec.h:3475
const char * av_get_profile_name(const AVCodec *codec, int profile)
Return a name for the specified profile, if available.
Definition: utils.c:1362
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:2193
int pts_dts_delta
Presentation delay of current frame in units of AVCodecContext.time_base.
Definition: avcodec.h:5130
attribute_deprecated int misc_bits
Definition: avcodec.h:2520
int(* execute2)(struct AVCodecContext *c, int(*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count)
The codec may call this to execute several independent things.
Definition: avcodec.h:2829
const char * long_name
Descriptive name for the codec, meant to be more human readable than name.
Definition: avcodec.h:3420
This structure describes the bitrate properties of an encoded bitstream.
Definition: avcodec.h:1099
AVBSFList * av_bsf_list_alloc(void)
Allocate empty list of bitstream filters.
Definition: bsf.c:399
The AV_PKT_DATA_NEW_EXTRADATA is used to notify the codec or the format that the extradata buffer was...
Definition: avcodec.h:1158
int bidir_refine
Definition: avcodec.h:2081
attribute_deprecated AVHWAccel * av_hwaccel_next(const AVHWAccel *hwaccel)
If hwaccel is NULL, returns the first registered hardware accelerator, if hwaccel is non-NULL...
Definition: utils.c:1759
AVCodecParserContext * av_parser_init(int codec_id)
Definition: parser.c:119
int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags)
The default callback for AVCodecContext.get_buffer2().
Definition: decode.c:1629
const char * wrapper_name
Group name of the codec implementation.
Definition: avcodec.h:3447
attribute_deprecated int mpeg_quant
Definition: avcodec.h:1812
const AVRational * supported_framerates
array of supported framerates, or NULL if any, array is terminated by {0,0}
Definition: avcodec.h:3428
A list of zero terminated key/value strings.
Definition: avcodec.h:1275
attribute_deprecated int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture, int *got_picture_ptr, const AVPacket *avpkt)
Decode the video frame of size avpkt->size from avpkt->data into picture.
Definition: decode.c:826
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
attribute_deprecated int scenechange_threshold
Definition: avcodec.h:2027
void avcodec_free_context(AVCodecContext **avctx)
Free the codec context and everything associated with it and write NULL to the provided pointer...
Definition: options.c:171
typedef void(RENAME(mix_any_func_type))
enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be)
Return the PCM codec associated with a sample format.
Definition: utils.c:1473
int compression_level
Definition: avcodec.h:1590
int seek_preroll
Number of samples to skip after a discontinuity.
Definition: avcodec.h:3120
attribute_deprecated int prediction_method
Definition: avcodec.h:1876
int sample_rate
samples per second
Definition: avcodec.h:2173
enum AVDiscard skip_idct
Skip IDCT/dequantization for selected frames.
Definition: avcodec.h:2968
attribute_deprecated int b_frame_strategy
Definition: avcodec.h:1791
const AVCodecParser * av_parser_iterate(void **opaque)
Iterate over all registered codec parsers.
Definition: parser.c:103
attribute_deprecated uint16_t * av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx)
Plain text, the text field must be set by the decoder and is authoritative.
Definition: avcodec.h:3814
int debug
debug
Definition: avcodec.h:2598
const AVCodecHWConfig * avcodec_get_hw_config(const AVCodec *codec, int index)
Retrieve supported hardware configurations for a codec.
Definition: utils.c:1747
main external API structure.
Definition: avcodec.h:1518
attribute_deprecated void av_codec_set_pkt_timebase(AVCodecContext *avctx, AVRational val)
AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
Definition: allcodecs.c:862
uint8_t * av_packet_pack_dictionary(AVDictionary *dict, int *size)
Pack a dictionary for use in side_data.
Definition: avpacket.c:482
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:592
int qmin
minimum quantizer
Definition: avcodec.h:2355
void avsubtitle_free(AVSubtitle *sub)
Free all allocated data in the given subtitle struct.
Definition: utils.c:1042
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> (&#39;D&#39;<<24) + (&#39;C&#39;<<16) + (&#39;B&#39;<<8) + &#39;A&#39;).
Definition: avcodec.h:1543
static void encode(AVCodecContext *ctx, AVFrame *frame, AVPacket *pkt, FILE *output)
Definition: encode_audio.c:95
int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame)
Supply a raw video or audio frame to the encoder.
Definition: encode.c:390
float spatial_cplx_masking
spatial complexity masking (0-> disabled)
Definition: avcodec.h:1850
void * buf
Definition: avisynth_c.h:690
Data found in BlockAdditional element of matroska container.
Definition: avcodec.h:1294
attribute_deprecated int header_bits
Definition: avcodec.h:2508
int extradata_size
Definition: avcodec.h:1619
unsigned int av_xiphlacing(unsigned char *s, unsigned int v)
Encode extradata length to a buffer.
Definition: utils.c:1726
struct AVCodec * next
Definition: avcodec.h:3457
uint16_t * intra_matrix
custom intra quantization matrix
Definition: avcodec.h:2015
int nb_coded_side_data
Definition: avcodec.h:3173
int slice_flags
slice flags
Definition: avcodec.h:1995
int(* func)(AVBPrint *dst, const char *in, const char *arg)
Definition: jacosubdec.c:67
Describe the class of an AVClass context structure.
Definition: log.h:67
int(* get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags)
This callback is called at the beginning of each frame to get data buffer(s) for it.
Definition: avcodec.h:2328
int index
Definition: gxfenc.c:89
enum AVColorSpace colorspace
YUV colorspace type.
Definition: avcodec.h:2141
Rational number (pair of numerator and denominator).
Definition: rational.h:58
attribute_deprecated int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Encode a frame of video.
Definition: encode.c:260
enum AVColorTransferCharacteristic color_trc
Color Transfer Characteristic.
Definition: avcodec.h:2134
const char * name
short name for the profile
Definition: avcodec.h:3343
int avcodec_parameters_from_context(AVCodecParameters *par, const AVCodecContext *codec)
Fill the parameters struct based on the values from the supplied codec context.
Definition: utils.c:2021
attribute_deprecated void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc)
AVFieldOrder
Definition: avcodec.h:1496
Recommmends skipping the specified number of samples.
Definition: avcodec.h:1259
int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type, uint8_t *data, size_t size)
Wrap an existing array as a packet side data.
Definition: avpacket.c:295
int sub_text_format
Control the form of AVSubtitle.rects[N]->ass.
Definition: avcodec.h:3204
AVMediaType
Definition: avutil.h:199
attribute_deprecated AVRational av_codec_get_pkt_timebase(const AVCodecContext *avctx)
Accessors for some AVCodecContext fields.
discard useless packets like 0 size packets in avi
Definition: avcodec.h:789
refcounted data buffer API
attribute_deprecated int av_codec_get_lowres(const AVCodecContext *avctx)
attribute_deprecated int brd_scale
Definition: avcodec.h:2086
char * codec_whitelist
&#39;,&#39; separated list of allowed decoders.
Definition: avcodec.h:3155
const char * name
Name of the codec described by this descriptor.
Definition: avcodec.h:707
int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
Definition: utils.c:538
attribute_deprecated int chromaoffset
Definition: avcodec.h:2106
float b_quant_offset
qscale offset between IP and B-frames
Definition: avcodec.h:1799
This side data contains encryption info for how to decrypt the packet.
Definition: avcodec.h:1358
#define AV_PARSER_PTS_NB
Definition: avcodec.h:5059
int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes)
Return audio frame duration.
Definition: utils.c:1700
float qcompress
amount of qscale change between easy & hard scenes (0.0-1.0)
Definition: avcodec.h:2347
attribute_deprecated int refcounted_frames
If non-zero, the decoded audio and video frames returned from avcodec_decode_video2() and avcodec_dec...
Definition: avcodec.h:2344
attribute_deprecated int p_tex_bits
Definition: avcodec.h:2512
uint16_t * inter_matrix
custom inter quantization matrix
Definition: avcodec.h:2022
int end_frame
Definition: avcodec.h:815
mfxU16 profile
Definition: qsvenc.c:44
attribute_deprecated int64_t convergence_duration
Definition: avcodec.h:5088
int seek_preroll
Audio only.
Definition: avcodec.h:4024
This struct describes the properties of a single codec described by an AVCodecID. ...
Definition: avcodec.h:699
float dark_masking
darkness masking (0-> disabled)
Definition: avcodec.h:1864
int global_quality
Global quality for codecs which cannot change it per frame.
Definition: avcodec.h:1584
static int64_t pts
int skip_bottom
Number of macroblock rows at the bottom which are skipped.
Definition: avcodec.h:2053
AVCodec * avcodec_find_decoder_by_name(const char *name)
Find a registered decoder with the specified name.
Definition: allcodecs.c:890
This side data should be associated with an audio stream and contains ReplayGain information in form ...
Definition: avcodec.h:1202
int output_picture_number
Picture number incremented in presentation or output order.
Definition: avcodec.h:5174
float temporal_cplx_masking
temporary complexity masking (0-> disabled)
Definition: avcodec.h:1843
int bits_per_raw_sample
This is the number of valid bits in each output sample.
Definition: avcodec.h:3939
Pan Scan area.
Definition: avcodec.h:1070
const AVClass * priv_class
AVClass for the private context.
Definition: avcodec.h:3434
MpegEncContext.
Definition: mpegvideo.h:81
struct AVCodecContext * avctx
Definition: mpegvideo.h:98
int gop_size
the number of pictures in a group of pictures, or 0 for intra_only
Definition: avcodec.h:1712
int sample_rate
Audio only.
Definition: avcodec.h:3994
enum AVMediaType type
Definition: avcodec.h:701
uint8_t max_lowres
maximum value for lowres supported by the decoder
Definition: avcodec.h:3433
A reference to a data buffer.
Definition: buffer.h:81
discard all non reference
Definition: avcodec.h:790
static int op(uint8_t **dst, const uint8_t *dst_end, GetByteContext *gb, int pixel, int count, int *x, int width, int linesize)
Perform decode operation.
Definition: anm.c:78
int extra_hw_frames
Definition: avcodec.h:3299
An AV_PKT_DATA_JP_DUALMONO side data packet indicates that the packet may contain "dual mono" audio s...
Definition: avcodec.h:1269
AVPacketSideData * side_data
Additional packet data that can be provided by the container.
Definition: avcodec.h:1441
int
attribute_deprecated int64_t convergence_duration
Definition: avcodec.h:1459
int mb_cmp
macroblock comparison function (not supported yet)
Definition: avcodec.h:1915
int av_bsf_list_parse_str(const char *str, AVBSFContext **bsf)
Parse string describing list of bitstream filters and create single AVBSFContext describing the whole...
Definition: bsf.c:506
int avcodec_get_hw_frames_parameters(AVCodecContext *avctx, AVBufferRef *device_ref, enum AVPixelFormat hw_pix_fmt, AVBufferRef **out_frames_ref)
Create and return a AVHWFramesContext with values adequate for hardware decoding. ...
Definition: decode.c:1201
static enum AVPixelFormat hw_pix_fmt
Definition: hw_decode.c:44
const OptionDef options[]
Definition: ffmpeg_opt.c:3292
enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos)
Converts swscale x/y chroma position to AVChromaLocation.
Definition: utils.c:361
Free mutex resources.
Definition: avcodec.h:6051
Utilties for rational number calculation.
attribute_deprecated void avpicture_free(AVPicture *picture)
Definition: avpicture.c:70
raw UTF-8 text
Definition: avcodec.h:645
attribute_deprecated int rtp_payload_size
Definition: avcodec.h:2495
int nsse_weight
noise vs.
Definition: avcodec.h:2836
static double c[64]
int profile
Codec-specific bitstream restrictions that the stream conforms to.
Definition: avcodec.h:3944
static enum AVCodecID codec_ids[]
uint32_t start_display_time
Definition: avcodec.h:3862
void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_padded_malloc except that buffer will always be 0-initialized after call...
Definition: utils.c:82
int(* encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size, const struct AVSubtitle *sub)
Definition: avcodec.h:3492
AVProfile.
Definition: avcodec.h:3341
attribute_deprecated AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:2760
int workaround_bugs
Work around bugs in encoders which sometimes cannot be detected automatically.
Definition: avcodec.h:2547
static const uint64_t c2
Definition: murmur3.c:50
int av_grow_packet(AVPacket *pkt, int grow_by)
Increase packet size, correctly zeroing padding.
Definition: avpacket.c:109
int caps_internal
Internal codec capabilities.
Definition: avcodec.h:3534
unsigned properties
Properties of the stream that gets decoded.
Definition: avcodec.h:3162
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
Definition: avpacket.c:33
enum AVDiscard skip_loop_filter
Skip loop filtering for selected frames.
Definition: avcodec.h:2961
int thread_safe_callbacks
Set by the client if its custom get_buffer() callback can be called synchronously from another thread...
Definition: avcodec.h:2798
int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec)
Definition: options.c:150
AVPictureStructure
Definition: avcodec.h:5025
attribute_deprecated void av_picture_copy(AVPicture *dst, const AVPicture *src, enum AVPixelFormat pix_fmt, int width, int height)
Definition: avpicture.c:75
int trellis
trellis RD quantization
Definition: avcodec.h:2462
The optional settings (rendering instructions) that immediately follow the timestamp specifier of a W...
Definition: avcodec.h:1305
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
Definition: utils.c:1167
static int lowres
Definition: ffplay.c:331
int slices
Number of slices.
Definition: avcodec.h:2164
void * priv_data
Definition: avcodec.h:1545
int cutoff
Audio cutoff bandwidth (0 means "automatic")
Definition: avcodec.h:2217
attribute_deprecated size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag)
Put a string representing the codec tag codec_tag in buf.
Definition: utils.c:1147
FAKE codec to indicate a raw MPEG-2 TS stream (only used by libavformat)
Definition: avcodec.h:686
Formatted text, the ass field must be set by the decoder and is authoritative.
Definition: avcodec.h:3820
int64_t frame_offset
Definition: avcodec.h:5035
enum AVCodecID id
Definition: avcodec.h:700
pixel format definitions
AVHWDeviceType
Definition: hwcontext.h:27
int dia_size
ME diamond size & shape.
Definition: avcodec.h:1945
uint8_t * dump_separator
dump format separator.
Definition: avcodec.h:3147
attribute_deprecated int frame_bits
Definition: avcodec.h:2524
attribute_deprecated int me_penalty_compensation
Definition: avcodec.h:2074
attribute_deprecated int min_prediction_order
Definition: avcodec.h:2467
as in Berlin toast format
Definition: avcodec.h:569
The codec supports this format via the hw_frames_ctx interface.
Definition: avcodec.h:3363
int avg_bitrate
Average bitrate of the stream, in bits per second.
Definition: avcodec.h:1114
char * args
Internal default arguments, used if NULL is passed to av_bitstream_filter_filter().
Definition: avcodec.h:5671
int channels
number of audio channels
Definition: avcodec.h:2174
int frame_priv_data_size
Size of per-frame hardware accelerator private data.
Definition: avcodec.h:3686
const int * supported_samplerates
array of supported audio samplerates, or NULL if unknown, array is terminated by 0 ...
Definition: avcodec.h:3430
int format
The format of the coded data, corresponds to enum AVPixelFormat for video and for enum AVSampleFormat...
Definition: avcodec.h:5196
unsigned avcodec_version(void)
Return the LIBAVCODEC_VERSION_INT constant.
Definition: utils.c:1390
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
Definition: avpacket.c:51
char * ass
0 terminated ASS/SSA compatible event line.
Definition: avcodec.h:3855
This side data corresponds to the AVCPBProperties struct.
Definition: avcodec.h:1248
attribute_deprecated int p_count
Definition: avcodec.h:2516
attribute_deprecated void(* rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb)
Definition: avcodec.h:2489
int mv0_threshold
Note: Value depends upon the compare function used for fullpel ME.
Definition: avcodec.h:2114
int flags2
AV_CODEC_FLAG2_*.
Definition: avcodec.h:1605
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:3926
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3898
AVDiscard
Definition: avcodec.h:785
attribute_deprecated void av_register_bitstream_filter(AVBitStreamFilter *bsf)
attribute_deprecated void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val)
int channels
Audio only.
Definition: avcodec.h:3990
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1429
const struct AVBitStreamFilter * filter
Definition: avcodec.h:5664
int64_t pts_correction_last_dts
PTS of the last frame.
Definition: avcodec.h:3080
const char * av_packet_side_data_name(enum AVPacketSideDataType type)
Definition: avpacket.c:367
int * slice_offset
slice offsets in the frame in bytes
Definition: avcodec.h:1887
int frame_number
Frame counter, set by libavcodec.
Definition: avcodec.h:2204
attribute_deprecated void av_free_packet(AVPacket *pkt)
Free a packet.
Definition: avpacket.c:281
int repeat_pict
This field is used for proper frame duration computation in lavf.
Definition: avcodec.h:5050
void INT64 INT64 count
Definition: avisynth_c.h:690
int64_t pts_correction_num_faulty_pts
Current statistics for PTS correction.
Definition: avcodec.h:3077
enum AVFieldOrder field_order
Field order.
Definition: avcodec.h:2170
void(* init_static_data)(struct AVCodec *codec)
Initialize codec static data, called from avcodec_register().
Definition: avcodec.h:3489
AVChromaLocation
Location of chroma samples.
Definition: pixfmt.h:518
int hwaccel_flags
Bit set of AV_HWACCEL_FLAG_* flags, which affect hardware accelerated decoding (if active)...
Definition: avcodec.h:3258
enum AVSampleFormat * sample_fmts
array of supported sample formats, or NULL if unknown, array is terminated by -1
Definition: avcodec.h:3431
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3888
int nb_channels
uint8_t * av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size)
Allocate new information of a packet.
Definition: avpacket.c:329
int debug_mv
debug motion vectors
Definition: avcodec.h:3128
int stream_index
Definition: avcodec.h:1432
const char *const * mime_types
MIME type(s) associated with the codec.
Definition: avcodec.h:721
AVBufferRef * hw_device_ctx
A reference to the AVHWDeviceContext describing the device which will be used by a hardware encoder/d...
Definition: avcodec.h:3249
uint64_t request_channel_layout
Request decoder to use this channel layout if it can (0 for default)
Definition: avcodec.h:2231
int me_pre_cmp
motion estimation prepass comparison function
Definition: avcodec.h:1965
The number of side data types.
Definition: avcodec.h:1368
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
The codec supports this format via the hw_device_ctx interface.
Definition: avcodec.h:3354
This structure stores compressed data.
Definition: avcodec.h:1407
const char * avcodec_profile_name(enum AVCodecID codec_id, int profile)
Return a name for the specified profile, if available.
Definition: utils.c:1375
AVCodecParameters * par_in
Parameters of the input stream.
Definition: avcodec.h:5715
int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size, const AVSubtitle *sub)
Definition: encode.c:345
int key_frame
Set by parser to 1 for key frames and 0 for non-key frames.
Definition: avcodec.h:5081
int delay
Codec delay.
Definition: avcodec.h:1673
int me_subpel_quality
subpel ME quality
Definition: avcodec.h:1979
int strict_std_compliance
strictly follow the standard (MPEG-4, ...).
Definition: avcodec.h:2576
int dts_sync_point
Synchronization point for start of timestamp generation.
Definition: avcodec.h:5101
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1423
enum AVPixelFormat sw_pix_fmt
Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:3047
A dummy ID pointing at the start of subtitle codecs.
Definition: avcodec.h:642
void * opaque
Private data of the user, can be used to carry app specific stuff.
Definition: avcodec.h:1560
int thread_type
Which multithreading methods to use.
Definition: avcodec.h:2779
AVSubtitleType
Definition: avcodec.h:3805
int avcodec_default_execute(AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2), void *arg, int *ret, int count, int size)
Definition: utils.c:431
int av_bsf_list_finalize(AVBSFList **lst, AVBSFContext **bsf)
Finalize list of bitstream filters.
Definition: bsf.c:451
discard nothing
Definition: avcodec.h:788
attribute_deprecated void av_codec_set_lowres(AVCodecContext *avctx, int val)
int64_t rc_max_rate
maximum bitrate
Definition: avcodec.h:2391
attribute_deprecated int pre_me
Definition: avcodec.h:1957
This side data should be associated with an audio stream and corresponds to enum AVAudioServiceType.
Definition: avcodec.h:1223
uint8_t * subtitle_header
Header containing style information for text subtitles.
Definition: avcodec.h:2985
int keyint_min
minimum GOP size
Definition: avcodec.h:2094