Macros | Functions | Variables
ituh263dec.c File Reference

h263 decoder. More...

#include <limits.h>
#include "libavutil/internal.h"
#include "libavutil/mathematics.h"
#include "avcodec.h"
#include "mpegvideo.h"
#include "h263.h"
#include "mathops.h"
#include "unary.h"
#include "flv.h"
#include "mpeg4video.h"
Include dependency graph for ituh263dec.c:

Go to the source code of this file.

Macros

#define UNCHECKED_BITSTREAM_READER   1
 
#define MV_VLC_BITS   9
 
#define H263_MBTYPE_B_VLC_BITS   6
 
#define CBPC_B_VLC_BITS   3
 

Functions

void ff_h263_show_pict_info (MpegEncContext *s)
 Print picture info if FF_DEBUG_PICT_INFO is set. More...
 
void ff_h263_decode_init_vlc (void)
 
int ff_h263_decode_mba (MpegEncContext *s)
 
static int h263_decode_gob_header (MpegEncContext *s)
 Decode the group of blocks header or slice header. More...
 
const uint8_t * ff_h263_find_resync_marker (MpegEncContext *s, const uint8_t *av_restrict p, const uint8_t *av_restrict end)
 Find the next resync_marker. More...
 
int ff_h263_resync (MpegEncContext *s)
 Decode the group of blocks / video packet header. More...
 
int ff_h263_decode_motion (MpegEncContext *s, int pred, int f_code)
 
static int h263p_decode_umotion (MpegEncContext *s, int pred)
 
static void preview_obmc (MpegEncContext *s)
 read the next MVs for OBMC. More...
 
static void h263_decode_dquant (MpegEncContext *s)
 
static int h263_decode_block (MpegEncContext *s, int16_t *block, int n, int coded)
 
static int h263_skip_b_part (MpegEncContext *s, int cbp)
 
static int h263_get_modb (GetBitContext *gb, int pb_frame, int *cbpb)
 
int ff_h263_decode_mb (MpegEncContext *s, int16_t block[6][64])
 
int ff_h263_decode_picture_header (MpegEncContext *s)
 

Variables

static const int h263_mb_type_b_map [15]
 
VLC ff_h263_intra_MCBPC_vlc
 
VLC ff_h263_inter_MCBPC_vlc
 
VLC ff_h263_cbpy_vlc
 
static VLC mv_vlc
 
static VLC h263_mbtype_b_vlc
 
static VLC cbpc_b_vlc
 

Detailed Description

h263 decoder.

Definition in file ituh263dec.c.

Macro Definition Documentation

#define CBPC_B_VLC_BITS   3

Definition at line 51 of file ituh263dec.c.

Referenced by ff_h263_decode_init_vlc(), and ff_h263_decode_mb().

#define H263_MBTYPE_B_VLC_BITS   6

Definition at line 50 of file ituh263dec.c.

Referenced by ff_h263_decode_init_vlc(), and ff_h263_decode_mb().

#define MV_VLC_BITS   9

Definition at line 49 of file ituh263dec.c.

Referenced by ff_h263_decode_init_vlc(), ff_h263_decode_motion(), ff_mpeg12_init_vlcs(), and mpeg_decode_motion().

#define UNCHECKED_BITSTREAM_READER   1

Definition at line 30 of file ituh263dec.c.

Function Documentation

void ff_h263_decode_init_vlc ( void  )

Definition at line 103 of file ituh263dec.c.

Referenced by ff_h263_decode_init(), and rv10_decode_init().

int ff_h263_decode_mb ( MpegEncContext *  s,
int16_t  block[6][64] 
)

Definition at line 605 of file ituh263dec.c.

Referenced by ff_h263_decode_init(), and rv10_decode_packet().

int ff_h263_decode_mba ( MpegEncContext *  s)

Definition at line 134 of file ituh263dec.c.

Referenced by ff_h263_decode_picture_header(), h263_decode_gob_header(), and rv20_decode_picture_header().

int ff_h263_decode_motion ( MpegEncContext *  s,
int  pred,
int  f_code 
)

Definition at line 273 of file ituh263dec.c.

Referenced by ff_h263_decode_mb(), mpeg4_decode_mb(), mpeg4_decode_partition_a(), and preview_obmc().

int ff_h263_decode_picture_header ( MpegEncContext *  s)

Definition at line 871 of file ituh263dec.c.

Referenced by ff_h263_decode_frame().

const uint8_t* ff_h263_find_resync_marker ( MpegEncContext *  s,
const uint8_t *av_restrict  p,
const uint8_t *av_restrict  end 
)

Find the next resync_marker.

Parameters
ppointer to buffer to scan
endpointer to the end of the buffer
Returns
pointer to the next resync_marker, or end if none was found

Definition at line 209 of file ituh263dec.c.

int ff_h263_resync ( MpegEncContext *  s)

Decode the group of blocks / video packet header.

Returns
bit position of the resync_marker, or <0 if none was found

Definition at line 231 of file ituh263dec.c.

Referenced by ff_h263_decode_frame().

void ff_h263_show_pict_info ( MpegEncContext *  s)

Print picture info if FF_DEBUG_PICT_INFO is set.

Definition at line 71 of file ituh263dec.c.

Referenced by ff_h263_decode_picture_header(), and ff_intel_h263_decode_picture_header().

static int h263_decode_block ( MpegEncContext *  s,
int16_t *  block,
int  n,
int  coded 
)
static

Definition at line 442 of file ituh263dec.c.

Referenced by ff_h263_decode_mb(), and h263_skip_b_part().

static void h263_decode_dquant ( MpegEncContext *  s)
static

Definition at line 429 of file ituh263dec.c.

Referenced by ff_h263_decode_mb().

static int h263_decode_gob_header ( MpegEncContext *  s)
static

Decode the group of blocks header or slice header.

Returns
<0 if an error occurred

Definition at line 152 of file ituh263dec.c.

Referenced by ff_h263_resync().

static int h263_get_modb ( GetBitContext *  gb,
int  pb_frame,
int *  cbpb 
)
static

Definition at line 587 of file ituh263dec.c.

Referenced by ff_h263_decode_mb().

static int h263_skip_b_part ( MpegEncContext *  s,
int  cbp 
)
static

Definition at line 565 of file ituh263dec.c.

Referenced by ff_h263_decode_mb().

static int h263p_decode_umotion ( MpegEncContext *  s,
int  pred 
)
static

Definition at line 311 of file ituh263dec.c.

Referenced by ff_h263_decode_mb(), and preview_obmc().

static void preview_obmc ( MpegEncContext *  s)
static

read the next MVs for OBMC.

yes this is a ugly hack, feel free to send a patch :)

Definition at line 337 of file ituh263dec.c.

Referenced by ff_h263_decode_mb().

Variable Documentation

VLC cbpc_b_vlc
static

Definition at line 98 of file ituh263dec.c.

VLC ff_h263_cbpy_vlc

Definition at line 95 of file ituh263dec.c.

Referenced by mpeg4_decode_mb(), mpeg4_decode_partition_b(), and msmpeg4v12_decode_mb().

VLC ff_h263_inter_MCBPC_vlc

Definition at line 94 of file ituh263dec.c.

Referenced by mpeg4_decode_mb(), mpeg4_decode_partition_a(), and msmpeg4v12_decode_mb().

VLC ff_h263_intra_MCBPC_vlc

Definition at line 93 of file ituh263dec.c.

Referenced by mpeg4_decode_mb(), mpeg4_decode_partition_a(), and msmpeg4v12_decode_mb().

const int h263_mb_type_b_map[15]
static
Initial value:
= {
MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
MB_TYPE_DIRECT2 | MB_TYPE_L0L1 | MB_TYPE_CBP,
MB_TYPE_DIRECT2 | MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_QUANT,
MB_TYPE_L0 | MB_TYPE_16x16,
MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_16x16,
MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
MB_TYPE_L1 | MB_TYPE_16x16,
MB_TYPE_L1 | MB_TYPE_CBP | MB_TYPE_16x16,
MB_TYPE_L1 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
MB_TYPE_L0L1 | MB_TYPE_16x16,
MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_16x16,
MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
0,
MB_TYPE_INTRA4x4 | MB_TYPE_CBP,
MB_TYPE_INTRA4x4 | MB_TYPE_CBP | MB_TYPE_QUANT,
}
MB_TYPE_INTRA4x4
#define MB_TYPE_INTRA4x4
Definition: libavcodec/avcodec.h:837
MB_TYPE_QUANT
#define MB_TYPE_QUANT
Definition: libavcodec/avcodec.h:856
MB_TYPE_DIRECT2
#define MB_TYPE_DIRECT2
Definition: libavcodec/avcodec.h:845
MB_TYPE_L0L1
#define MB_TYPE_L0L1
Definition: libavcodec/avcodec.h:855
MB_TYPE_L1
#define MB_TYPE_L1
Definition: libavcodec/avcodec.h:854
MB_TYPE_16x16
#define MB_TYPE_16x16
Definition: libavcodec/avcodec.h:840
MB_TYPE_CBP
#define MB_TYPE_CBP
Definition: libavcodec/avcodec.h:857
MB_TYPE_L0
#define MB_TYPE_L0
Definition: libavcodec/avcodec.h:853

Definition at line 53 of file ituh263dec.c.

Referenced by ff_h263_decode_mb().

VLC h263_mbtype_b_vlc
static

Definition at line 97 of file ituh263dec.c.

VLC mv_vlc
static

Definition at line 96 of file ituh263dec.c.

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