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bitstream.c File Reference

bitstream api. More...

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

Go to the source code of this file.

Data Structures

struct  VLCcode


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


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 av_always_inline uint32_t bitswap_32 (uint32_t x)
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)


const uint8_t ff_log2_run [41]

Detailed Description

bitstream api.

Definition in file bitstream.c.

Macro Definition Documentation

#define GET_DATA (   v,
{ \
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; \
} \
ptrdiff_t size
Definition: opengl_enc.c:101
static const struct endianess table[]
#define wrap(func)
Definition: neontest.h:65

Definition at line 92 of file bitstream.c.

#define COPY (   condition)
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);\
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 %x for %d in init_vlc\n", buf[j].code, i);\
return -1; \
} \
buf[j].code = bitswap_32(buf[j].code); \
buf[j].code <<= 32 - buf[j].bits; \
if (symbols) \
GET_DATA(buf[j].symbol, symbols, i, symbols_wrap, symbols_size) \
buf[j].symbol = i; \
j++; \
#define NULL
Definition: coverity.c:32
#define GET_DATA(v, table, i, wrap, size)
Definition: bitstream.c:92
uint8_t bits
Definition: crc.c:296
static av_always_inline uint32_t bitswap_32(uint32_t x)
Definition: bitstream.c:129
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define INIT_VLC_LE
Definition: vlc.h:54
void * buf
Definition: avisynth_c.h:553
static int flags
Definition: cpu.c:47
if(ret< 0)
Definition: vf_mcdeint.c:282
Definition: vlc.h:55
#define av_free(p)

Referenced by ff_init_vlc_sparse().

Function Documentation

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

Put the string string in the bitstream.

terminate_string0-terminates the written string if value is 1

Definition at line 54 of file bitstream.c.

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

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

Copy the content of src to the bitstream.

lengththe number of bits of src to copy

Definition at line 65 of file bitstream.c.

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

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

Definition at line 109 of file bitstream.c.

Referenced by build_table(), and mp_decode_layer2().

static av_always_inline uint32_t bitswap_32 ( uint32_t  x)

Definition at line 129 of file bitstream.c.

Referenced by build_table().

static int compare_vlcspec ( const void a,
const void b 

Definition at line 145 of file bitstream.c.

Referenced by ff_init_vlc_sparse().

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().

vlcthe context to be initialized
table_nb_bitsmax length of vlc codes to store directly in this table (Longer codes are delegated to subtables.)
nb_codesnumber of elements in codes[]
codesdescriptions 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 164 of file bitstream.c.

Referenced by 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 
void ff_free_vlc ( VLC vlc)

Variable Documentation

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,

Definition at line 40 of file bitstream.c.

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