libavcodec/bitstream.c File Reference

bitstream api. More...

#include "avcodec.h"
#include "bitstream.h"

Go to the source code of this file.

Defines
#define	GET_DATA(v, table, i, wrap, size)
Functions
attribute_deprecated	av_alloc_size (2)
	Same as av_mallocz_static(), but does a realloc.
void	align_put_bits (PutBitContext *s)
void	ff_put_string (PutBitContext *pbc, const char *s, int put_zero)
void	ff_copy_bits (PutBitContext *pb, const uint8_t *src, int length)
static int	alloc_table (VLC *vlc, int size, int use_static)
static int	build_table (VLC *vlc, int table_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, uint32_t code_prefix, int n_prefix, int flags)
int	init_vlc_sparse (VLC *vlc, 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	free_vlc (VLC *vlc)
Variables
const uint8_t	ff_log2_run [32]

---

Detailed Description

bitstream api.

Definition in file bitstream.c.

---

Define Documentation

#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;\
    default:\
        v = *(const uint32_t *)ptr;\
        break;\
    }\
}

Definition at line 102 of file bitstream.c.

Referenced by build_table().

---

Function Documentation

void align_put_bits

(

PutBitContext *

s

)

Definition at line 57 of file bitstream.c.

Referenced by encode_block(), encode_frame(), encode_picture_ls(), ff_h261_encode_picture_header(), flush_put_bits(), h264_write_nal_unit(), put_bitstream_info(), put_header(), and write_slice_end().

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

Definition at line 119 of file bitstream.c.

Referenced by build_table(), and mp_decode_layer2().

attribute_deprecated av_alloc_size

(

2

)

Same as av_mallocz_static(), but does a realloc.

Parameters:

[in]	ptr	The block of memory to reallocate.
[in]	size	The requested size.

Returns:

Block of memory of requested size.

Deprecated:

. Code which uses ff_realloc_static is broken/misdesigned and should correctly use static arrays

Definition at line 49 of file bitstream.c.

static int build_table	(	VLC *	vlc,
		int	table_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,
		uint32_t	code_prefix,
		int	n_prefix,
		int	flags
	)			[static]

Definition at line 140 of file bitstream.c.

Referenced by init_vlc_sparse().

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

Definition at line 76 of file bitstream.c.

Referenced by encode_thread(), merge_context_after_encode(), and svq1_encode_plane().

void ff_put_string	(	PutBitContext *	pbc,
		const char *	s,
		int	put_zero
	)

Definition at line 66 of file bitstream.c.

Referenced by jpeg_put_comments().

void free_vlc

(

VLC *

vlc

)

Definition at line 316 of file bitstream.c.

Referenced by cook_decode_close(), decode_end(), dnxhd_decode_close(), dvvideo_init(), ff_mjpeg_decode_dht(), ff_mjpeg_decode_end(), ff_wma_end(), fraps2_decode_plane(), generate_joint_tables(), mimic_decode_end(), mp_decode_frame(), read_huffman_tables(), read_old_huffman_tables(), smacker_decode_header_tree(), smka_decode_frame(), tm2_free_codes(), vorbis_free(), vp3_decode_end(), vp56_free(), and vp6_build_huff_tree().

int init_vlc_sparse	(	VLC *	vlc,
		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 274 of file bitstream.c.

Referenced by build_huff_tree(), ff_ccitt_unpack_init(), generate_joint_tables(), mpc8_decode_init(), rv34_gen_vlc(), and rv40_init_tables().

---

Variable Documentation

const uint8_t ff_log2_run[32]

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
}

Definition at line 33 of file bitstream.c.

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