bitstream api. More...

#include "libavutil/avassert.h"
#include "libavutil/qsort.h"
#include "avcodec.h"
#include "internal.h"
#include "mathops.h"
#include "put_bits.h"
#include "vlc.h"

Data Structures
struct	VLCcode

Macros
#define	GET_DATA(v, table, i, wrap, size)

#define	COPY(condition)

Functions
void	avpriv_align_put_bits (PutBitContext *s)
	Pad the bitstream with zeros up to the next byte boundary. More...

void	avpriv_put_string (PutBitContext pb, const char string, int terminate_string)
	Put the string string in the bitstream. More...

void	avpriv_copy_bits (PutBitContext pb, const uint8_t src, int length)
	Copy the content of src to the bitstream. More...

static int	alloc_table (VLC *vlc, int size, int use_static)

static int	compare_vlcspec (const void a, const void b)

static int	build_table (VLC vlc, int table_nb_bits, int nb_codes, VLCcode codes, int flags)
	Build VLC decoding tables suitable for use with get_vlc(). More...

int	ff_init_vlc_sparse (VLC vlc_arg, int nb_bits, int nb_codes, const void bits, int bits_wrap, int bits_size, const void codes, int codes_wrap, int codes_size, const void symbols, int symbols_wrap, int symbols_size, int flags)

void	ff_free_vlc (VLC *vlc)

Variables
const uint8_t	ff_log2_run [41]

Detailed Description

bitstream api.

Definition in file bitstream.c.

Macro Definition Documentation

◆ GET_DATA

#define GET_DATA	(	v,
		table,
		i,
		wrap,
		size
	)

Value:

{                                                           \
    const uint8_t *ptr = (const uint8_t *)table + i * wrap; \
    switch(size) {                                          \
    case 1:                                                 \
        v = *(const uint8_t *)ptr;                          \
        break;                                              \
    case 2:                                                 \
        v = *(const uint16_t *)ptr;                         \
        break;                                              \
    case 4:                                                 \
        v = *(const uint32_t *)ptr;                         \
        break;                                              \
    default:                                                \
        av_assert1(0);                                      \
    }                                                       \
}

Definition at line 91 of file bitstream.c.

◆ COPY

#define COPY ( condition )

Value:

for (i = 0; i < nb_codes; i++) {                                        \
        GET_DATA(buf[j].bits, bits, i, bits_wrap, bits_size);               \
        if (!(condition))                                                   \
            continue;                                                       \
        if (buf[j].bits > 3*nb_bits || buf[j].bits>32) {                    \
            av_log(NULL, AV_LOG_ERROR, "Too long VLC (%d) in init_vlc\n", buf[j].bits);\
            if (!(flags & INIT_VLC_USE_NEW_STATIC))                         \
                av_free(buf);                                               \
            return -1;                                                      \
        }                                                                   \
        GET_DATA(buf[j].code, codes, i, codes_wrap, codes_size);            \
        if (buf[j].code >= (1LL<<buf[j].bits)) {                            \
            av_log(NULL, AV_LOG_ERROR, "Invalid code %"PRIx32" for %d in "  \
                   "init_vlc\n", buf[j].code, i);                           \
            if (!(flags & INIT_VLC_USE_NEW_STATIC))                         \
                av_free(buf);                                               \
            return -1;                                                      \
        }                                                                   \
        if (flags & INIT_VLC_LE)                                            \
            buf[j].code = bitswap_32(buf[j].code);                          \
        else                                                                \
            buf[j].code <<= 32 - buf[j].bits;                               \
        if (symbols)                                                        \
            GET_DATA(buf[j].symbol, symbols, i, symbols_wrap, symbols_size) \
        else                                                                \
            buf[j].symbol = i;                                              \
        j++;                                                                \
    }

Referenced by ff_init_vlc_sparse().

Function Documentation

◆ avpriv_align_put_bits()

void avpriv_align_put_bits ( PutBitContext * s )

Pad the bitstream with zeros up to the next byte boundary.

Definition at line 48 of file bitstream.c.

Referenced by binary_export(), encode_block(), encode_frame(), encode_hq_slice(), encode_parse_info(), encode_picture_header(), encode_picture_ls(), encode_picture_start(), encode_seq_header(), encode_slices(), encode_wavelet_transform(), ff_copy_pce_data(), ff_flv_encode_picture_header(), ff_h261_encode_picture_header(), ff_h263_encode_picture_header(), ff_hevc_encode_nal_vps(), ff_msmpeg4_encode_picture_header(), ff_rv10_encode_picture_header(), flush_put_bits_le(), latm_write_packet(), put_bitstream_info(), put_header(), put_pce(), write_slice_end(), xsub_encode(), and xsub_encode_rle().

◆ avpriv_put_string()

void avpriv_put_string	(	PutBitContext *	pb,
		const char *	string,
		int	terminate_string
	)

Put the string string in the bitstream.

Parameters

terminate_string 0-terminates the written string if value is 1

Definition at line 53 of file bitstream.c.

Referenced by encode_frame(), encode_parse_info(), flush_put_bits_le(), jpeg_put_comments(), mpeg4_encode_vol_header(), and put_pce().

◆ avpriv_copy_bits()

void avpriv_copy_bits	(	PutBitContext *	pb,
		const uint8_t *	src,
		int	length
	)

Copy the content of src to the bitstream.

Parameters

length the number of bits of src to copy

Definition at line 64 of file bitstream.c.

Referenced by copy_bits(), encode_thread(), ff_mpeg4_merge_partitions(), flush_put_bits_le(), latm_write_frame_header(), latm_write_packet(), merge_context_after_encode(), save_bits(), and svq1_encode_plane().

◆ alloc_table()

static int alloc_table	(	VLC *	vlc,
		int	size,
		int	use_static
	)

static

Definition at line 110 of file bitstream.c.

Referenced by build_table(), and mp_decode_layer2().

◆ compare_vlcspec()

static int compare_vlcspec	(	const void *	a,
		const void *	b
	)

static

Definition at line 138 of file bitstream.c.

Referenced by ff_init_vlc_sparse().

◆ build_table()

static int build_table	(	VLC *	vlc,
		int	table_nb_bits,
		int	nb_codes,
		VLCcode *	codes,
		int	flags
	)

static

Build VLC decoding tables suitable for use with get_vlc().

Parameters

vlc	the context to be initialized
table_nb_bits	max length of vlc codes to store directly in this table (Longer codes are delegated to subtables.)
nb_codes	number of elements in codes[]
codes	descriptions of the vlc codes These must be ordered such that codes going into the same subtable are contiguous. Sorting by VLCcode.code is sufficient, though not necessary.

Definition at line 157 of file bitstream.c.

Referenced by ff_init_vlc_sparse().

◆ ff_init_vlc_sparse()

int ff_init_vlc_sparse	(	VLC *	vlc_arg,
		int	nb_bits,
		int	nb_codes,
		const void *	bits,
		int	bits_wrap,
		int	bits_size,
		const void *	codes,
		int	codes_wrap,
		int	codes_size,
		const void *	symbols,
		int	symbols_wrap,
		int	symbols_size,
		int	flags
	)

Definition at line 268 of file bitstream.c.

Referenced by build_canonical_huff(), build_huff(), build_huff10(), build_huff_tree(), build_vlc(), clv_decode_init(), ff_atrac3p_init_vlcs(), ff_ccitt_unpack_init(), generate_joint_tables(), huff_build(), huff_build10(), huff_build12(), init_ralf_vlc(), init_vlcs(), mpc8_decode_init(), mss4_init_vlc(), on2avc_decode_init(), read_code_table(), rv34_gen_vlc(), and rv40_init_tables().

◆ ff_free_vlc()

void ff_free_vlc ( VLC * vlc )

Definition at line 354 of file bitstream.c.

Referenced by build_vlc(), cfhd_close(), clv_decode_end(), cook_decode_close(), decode_argb_frame(), decode_close(), decode_end(), decode_plane(), decode_plane10(), decode_rgb24_frame(), decode_rle(), decode_yuv_frame(), dnxhd_decode_close(), dnxhd_init_vlc(), ff_dvvideo_init(), ff_ivi_dec_huff_desc(), ff_ivi_decode_close(), ff_mjpeg_decode_dht(), ff_mjpeg_decode_end(), ff_wma_end(), fraps2_decode_plane(), free_vlcs(), generate_joint_tables(), hq_hqa_decode_close(), hqx_decode_close(), huff_build(), huff_build10(), huff_build12(), image_ctx_free(), ivi_free_buffers(), jpg_free_context(), magy_decode_end(), mimic_decode_end(), mp_decode_frame(), mss4_free_vlcs(), on2avc_free_vlcs(), read_huffman_code_normal(), read_huffman_tables(), read_old_huffman_tables(), smacker_decode_header_tree(), smka_decode_frame(), tm2_free_codes(), vorbis_free(), vp3_decode_end(), vp6_build_huff_tree(), and vp6_decode_free_context().

Variable Documentation

◆ ff_log2_run

const uint8_t ff_log2_run[41]

Initial value:

={
 0, 0, 0, 0, 1, 1, 1, 1,
 2, 2, 2, 2, 3, 3, 3, 3,
 4, 4, 5, 5, 6, 6, 7, 7,
 8, 9,10,11,12,13,14,15,
16,17,18,19,20,21,22,23,
24,
}

Definition at line 39 of file bitstream.c.

Referenced by decode_line(), encode_line(), ls_decode_line(), ls_encode_line(), and ls_encode_run().

Data Structures

Macros

Functions

Variables

Detailed Description

Macro Definition Documentation

◆ GET_DATA

◆ COPY

Function Documentation

◆ avpriv_align_put_bits()

◆ avpriv_put_string()

◆ avpriv_copy_bits()

◆ alloc_table()

◆ compare_vlcspec()

◆ build_table()

◆ ff_init_vlc_sparse()

◆ ff_free_vlc()

Variable Documentation

◆ ff_log2_run