libavcodec/ituh263dec.c File Reference

h263 decoder. More...

#include <limits.h>
#include "libavutil/mathematics.h"
#include "dsputil.h"
#include "avcodec.h"
#include "mpegvideo.h"
#include "h263.h"
#include "mathops.h"
#include "unary.h"
#include "flv.h"
#include "mpeg4video.h"

Go to the source code of this file.

Defines

#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.

void ff_h263_decode_init_vlc (MpegEncContext *s)

int ff_h263_decode_mba (MpegEncContext *s)

static int h263_decode_gob_header (MpegEncContext *s)

Decode the group of blocks header or slice header.

const uint8_t * ff_h263_find_resync_marker (const uint8_t *restrict p, const uint8_t *restrict end)

Find the next resync_marker.

int ff_h263_resync (MpegEncContext *s)

Decode the group of blocks / video packet header.

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.

static void h263_decode_dquant (MpegEncContext *s)

static int h263_decode_block (MpegEncContext *s, DCTELEM *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, DCTELEM 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.

Define Documentation

#define CBPC_B_VLC_BITS 3

Definition at line 54 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 53 of file ituh263dec.c.

Referenced by ff_h263_decode_init_vlc(), and ff_h263_decode_mb().

#define MV_VLC_BITS 9

Definition at line 52 of file ituh263dec.c.

Referenced by ff_h263_decode_init_vlc(), ff_h263_decode_motion(), ff_mpeg12_init_vlcs(), ff_msmpeg4_decode_init(), ff_msmpeg4_decode_motion(), 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 ( MpegEncContext * s )

Definition at line 106 of file ituh263dec.c.

Referenced by ff_h263_decode_init(), and rv10_decode_init().

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

Definition at line 603 of file ituh263dec.c.

Referenced by ff_h263_decode_init(), and rv10_decode_packet().

int ff_h263_decode_mba ( MpegEncContext * s )

Definition at line 138 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 274 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 869 of file ituh263dec.c.

Referenced by ff_h263_decode_frame().

const uint8_t* ff_h263_find_resync_marker	(	const uint8_t *restrict	p,
		const uint8_t *restrict	end
	)

Find the next resync_marker.

Parameters:

	p	pointer to buffer to scan
	end	pointer to the end of the buffer

Returns:: pointer to the next resync_marker, or end if none was found

Definition at line 213 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 232 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 74 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,
		DCTELEM *	block,
		int	n,
		int	coded
	)			`[static]`

Definition at line 443 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 430 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 156 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 585 of file ituh263dec.c.

Referenced by ff_h263_decode_mb().

static int h263_skip_b_part	(	MpegEncContext *	s,
		int	cbp
	)			`[static]`

Definition at line 566 of file ituh263dec.c.

Referenced by ff_h263_decode_mb().

static int h263p_decode_umotion	(	MpegEncContext *	s,
		int	pred
	)			`[static]`

Definition at line 312 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 338 of file ituh263dec.c.

Referenced by ff_h263_decode_mb().

Variable Documentation

VLC cbpc_b_vlc [static]

Definition at line 101 of file ituh263dec.c.

VLC ff_h263_cbpy_vlc

Definition at line 98 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 97 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 96 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,
}

Definition at line 56 of file ituh263dec.c.

Referenced by ff_h263_decode_mb().

VLC h263_mbtype_b_vlc [static]

Definition at line 100 of file ituh263dec.c.

VLC mv_vlc [static]

Definition at line 99 of file ituh263dec.c.


Defines
#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.
void	ff_h263_decode_init_vlc (MpegEncContext *s)
int	ff_h263_decode_mba (MpegEncContext *s)
static int	h263_decode_gob_header (MpegEncContext *s)
	Decode the group of blocks header or slice header.
const uint8_t *	ff_h263_find_resync_marker (const uint8_t restrict p, const uint8_t restrict end)
	Find the next resync_marker.
int	ff_h263_resync (MpegEncContext *s)
	Decode the group of blocks / video packet header.
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.
static void	h263_decode_dquant (MpegEncContext *s)
static int	h263_decode_block (MpegEncContext s, DCTELEM 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, DCTELEM 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