h264dec.c File Reference

H.264 / AVC / MPEG-4 part10 codec. More...

#include "libavutil/avassert.h"
#include "libavutil/display.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/stereo3d.h"
#include "libavutil/timer.h"
#include "internal.h"
#include "bytestream.h"
#include "cabac.h"
#include "cabac_functions.h"
#include "error_resilience.h"
#include "avcodec.h"
#include "h264.h"
#include "h264dec.h"
#include "h2645_parse.h"
#include "h264data.h"
#include "h264chroma.h"
#include "h264_mvpred.h"
#include "h264_ps.h"
#include "golomb.h"
#include "hwaccel.h"
#include "mathops.h"
#include "me_cmp.h"
#include "mpegutils.h"
#include "profiles.h"
#include "rectangle.h"
#include "thread.h"

Go to the source code of this file.

Macros
#define	UNCHECKED_BITSTREAM_READER   1
#define	OFFSET(x)   offsetof(H264Context, x)
#define	VD   AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM

Functions
int	avpriv_h264_has_num_reorder_frames (AVCodecContext *avctx)
static void	h264_er_decode_mb (void *opaque, int ref, int mv_dir, int mv_type, int(*mv)[2][4][2], int mb_x, int mb_y, int mb_intra, int mb_skipped)
void	ff_h264_draw_horiz_band (const H264Context *h, H264SliceContext *sl, int y, int height)
void	ff_h264_free_tables (H264Context *h)
int	ff_h264_alloc_tables (H264Context *h)
	Allocate tables. More...
int	ff_h264_slice_context_init (H264Context *h, H264SliceContext *sl)
	Init context Allocate buffers which are not shared amongst multiple threads. More...
static int	h264_init_context (AVCodecContext *avctx, H264Context *h)
static av_cold int	h264_decode_end (AVCodecContext *avctx)
static av_cold int	h264_decode_init (AVCodecContext *avctx)
static void	idr (H264Context *h)
	instantaneous decoder refresh. More...
void	ff_h264_flush_change (H264Context *h)
static void	flush_dpb (AVCodecContext *avctx)
static int	get_last_needed_nal (H264Context *h)
static void	debug_green_metadata (const H264SEIGreenMetaData *gm, void *logctx)
static int	decode_nal_units (H264Context *h, const uint8_t *buf, int buf_size)
static int	get_consumed_bytes (int pos, int buf_size)
	Return the number of bytes consumed for building the current frame. More...
static int	output_frame (H264Context *h, AVFrame *dst, H264Picture *srcp)
static int	is_extra (const uint8_t *buf, int buf_size)
static int	finalize_frame (H264Context *h, AVFrame *dst, H264Picture *out, int *got_frame)
static int	send_next_delayed_frame (H264Context *h, AVFrame *dst_frame, int *got_frame, int buf_index)
static int	h264_decode_frame (AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)

Variables
const uint16_t	ff_h264_mb_sizes [4] = { 256, 384, 512, 768 }
static AVOnce	h264_vlc_init = AV_ONCE_INIT
static const AVOption	h264_options []
static const AVClass	h264_class
AVCodec	ff_h264_decoder

Detailed Description

H.264 / AVC / MPEG-4 part10 codec.

Author

Michael Niedermayer micha.nosp@m.elni.nosp@m.@gmx..nosp@m.at

Definition in file h264dec.c.

Macro Definition Documentation

UNCHECKED_BITSTREAM_READER

#define UNCHECKED_BITSTREAM_READER   1

Definition at line 28 of file h264dec.c.

OFFSET

#define OFFSET

(

x

)

offsetof(H264Context, x)

Definition at line 1030 of file h264dec.c.

VD

#define VD   AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM

Definition at line 1031 of file h264dec.c.

Function Documentation

avpriv_h264_has_num_reorder_frames()

int avpriv_h264_has_num_reorder_frames

(

AVCodecContext *

avctx

)

Definition at line 60 of file h264dec.c.

Referenced by ff_exp2fi(), and has_decode_delay_been_guessed().

h264_er_decode_mb()

static void h264_er_decode_mb ( void *  opaque, int  ref, int  mv_dir, int  mv_type, int(*)  mv[2][4][2], int  mb_x, int  mb_y, int  mb_intra, int  mb_skipped  )

static

Definition at line 66 of file h264dec.c.

Referenced by ff_h264_slice_context_init().

ff_h264_draw_horiz_band()

void ff_h264_draw_horiz_band	(	const H264Context *	h,
		H264SliceContext *	sl,
		int	y,
		int	height
	)

Definition at line 102 of file h264dec.c.

Referenced by decode_finish_row(), dxva2_h264_end_frame(), find_start_code(), vaapi_h264_end_frame(), and vdpau_h264_end_frame().

ff_h264_free_tables()

void ff_h264_free_tables

(

H264Context *

h

)

Definition at line 137 of file h264dec.c.

Referenced by ff_h264_alloc_tables(), find_start_code(), flush_dpb(), h264_decode_end(), and h264_slice_header_init().

ff_h264_alloc_tables()

int ff_h264_alloc_tables

(

H264Context *

h

)

Allocate tables.

needs width/height

Definition at line 180 of file h264dec.c.

Referenced by h264_slice_header_init().

ff_h264_slice_context_init()

int ff_h264_slice_context_init	(	H264Context *	h,
		H264SliceContext *	sl
	)

Init context Allocate buffers which are not shared amongst multiple threads.

Definition at line 238 of file h264dec.c.

Referenced by find_start_code(), and h264_slice_header_init().

h264_init_context()

static int h264_init_context ( AVCodecContext *  avctx, H264Context *  h  )

static

Definition at line 303 of file h264dec.c.

Referenced by h264_decode_init().

h264_decode_end()

static av_cold int h264_decode_end ( AVCodecContext *  avctx )

static

Definition at line 358 of file h264dec.c.

Referenced by h264_decode_init().

h264_decode_init()

static av_cold int h264_decode_init ( AVCodecContext *  avctx )

static

Definition at line 392 of file h264dec.c.

idr()

static void idr ( H264Context *  h )

static

instantaneous decoder refresh.

Definition at line 470 of file h264dec.c.

Referenced by decode_nal_units(), ff_h264_flush_change(), and h264_probe().

ff_h264_flush_change()

void ff_h264_flush_change

(

H264Context *

h

)

Definition at line 483 of file h264dec.c.

Referenced by find_start_code(), flush_dpb(), h264_decode_init(), and h264_init_ps().

flush_dpb()

static void flush_dpb ( AVCodecContext *  avctx )

static

Definition at line 509 of file h264dec.c.

get_last_needed_nal()

static int get_last_needed_nal ( H264Context *  h )

static

Definition at line 530 of file h264dec.c.

Referenced by decode_nal_units().

debug_green_metadata()

static void debug_green_metadata ( const H264SEIGreenMetaData *  gm, void *  logctx  )

static

Definition at line 572 of file h264dec.c.

Referenced by decode_nal_units().

decode_nal_units()

static int decode_nal_units ( H264Context *  h, const uint8_t *  buf, int  buf_size  )

static

< number of NALs that need decoding before the next frame thread starts

Definition at line 600 of file h264dec.c.

Referenced by h264_decode_frame().

get_consumed_bytes()

static int get_consumed_bytes ( int  pos, int  buf_size  )

static

Return the number of bytes consumed for building the current frame.

Definition at line 826 of file h264dec.c.

Referenced by h264_decode_frame().

output_frame()

static int output_frame ( H264Context *  h, AVFrame *  dst, H264Picture *  srcp  )

static

Examples:

transcode_aac.c.

Definition at line 836 of file h264dec.c.

Referenced by deint_vaapi_filter_frame(), finalize_frame(), load_encode_and_write(), misc_vaapi_filter_frame(), procamp_vaapi_filter_frame(), and scale_vaapi_filter_frame().

is_extra()

static int is_extra ( const uint8_t *  buf, int  buf_size  )

static

Definition at line 853 of file h264dec.c.

Referenced by h264_decode_frame().

finalize_frame()

static int finalize_frame ( H264Context *  h, AVFrame *  dst, H264Picture *  out, int *  got_frame  )

static

Definition at line 875 of file h264dec.c.

Referenced by h264_decode_frame(), and send_next_delayed_frame().

send_next_delayed_frame()

static int send_next_delayed_frame ( H264Context *  h, AVFrame *  dst_frame, int *  got_frame, int  buf_index  )

static

Definition at line 925 of file h264dec.c.

Referenced by h264_decode_frame().

h264_decode_frame()

static int h264_decode_frame ( AVCodecContext *  avctx, void *  data, int *  got_frame, AVPacket *  avpkt  )

static

Definition at line 958 of file h264dec.c.

Variable Documentation

ff_h264_mb_sizes

const uint16_t ff_h264_mb_sizes[4] = { 256, 384, 512, 768 }

Definition at line 58 of file h264dec.c.

Referenced by ff_h264_decode_mb_cabac(), ff_h264_decode_mb_cavlc(), and hl_decode_mb().

h264_vlc_init

AVOnce h264_vlc_init = AV_ONCE_INIT

static

Definition at line 390 of file h264dec.c.

h264_options

const AVOption h264_options[]

static

Initial value:

= {
    { "is_avc", "is avc", OFFSET(is_avc), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0 },
    { "nal_length_size", "nal_length_size", OFFSET(nal_length_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 4, 0 },
    { "enable_er", "Enable error resilience on damaged frames (unsafe)", OFFSET(enable_er), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, VD },
    { "x264_build", "Assume this x264 version if no x264 version found in any SEI", OFFSET(x264_build), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, VD },
    { NULL },
}

Definition at line 1032 of file h264dec.c.

h264_class

const AVClass h264_class

static

Initial value:

= {
    .class_name = "H264 Decoder",
    .item_name  = av_default_item_name,
    .option     = h264_options,
    .version    = LIBAVUTIL_VERSION_INT,
}

Definition at line 1040 of file h264dec.c.

ff_h264_decoder

AVCodec ff_h264_decoder

Definition at line 1047 of file h264dec.c.