h263 decoder. More...

#include <limits.h>
#include "libavutil/attributes.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"

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.

av_cold 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.

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.

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, 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 UNCHECKED_BITSTREAM_READER 1

Definition at line 30 of file ituh263dec.c.

#define MV_VLC_BITS 9

Definition at line 48 of file ituh263dec.c.

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

#define H263_MBTYPE_B_VLC_BITS 6

Definition at line 49 of file ituh263dec.c.

Referenced by ff_h263_decode_init_vlc(), and ff_h263_decode_mb().

#define CBPC_B_VLC_BITS 3

Definition at line 50 of file ituh263dec.c.

Referenced by ff_h263_decode_init_vlc(), and ff_h263_decode_mb().

Function Documentation

void ff_h263_show_pict_info ( MpegEncContext * s )

Print picture info if FF_DEBUG_PICT_INFO is set.

Definition at line 70 of file ituh263dec.c.

Referenced by ff_h263_decode_picture_header(), and ff_intel_h263_decode_picture_header().

av_cold void ff_h263_decode_init_vlc ( void )

Definition at line 102 of file ituh263dec.c.

Referenced by ff_h263_decode_init(), and rv10_decode_init().

int ff_h263_decode_mba ( MpegEncContext * s )

Definition at line 133 of file ituh263dec.c.

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

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 151 of file ituh263dec.c.

Referenced by ff_h263_resync().

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

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 208 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 230 of file ituh263dec.c.

Referenced by ff_h263_decode_frame().

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

Definition at line 272 of file ituh263dec.c.

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

static int h263p_decode_umotion	(	MpegEncContext *	s,
		int	pred
	)

static

Definition at line 310 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 336 of file ituh263dec.c.

Referenced by ff_h263_decode_mb().

static void h263_decode_dquant ( MpegEncContext * s )

static

Definition at line 428 of file ituh263dec.c.

Referenced by ff_h263_decode_mb().

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

static

Definition at line 441 of file ituh263dec.c.

Referenced by ff_h263_decode_mb(), and h263_skip_b_part().

static int h263_skip_b_part	(	MpegEncContext *	s,
		int	cbp
	)

static

Definition at line 564 of file ituh263dec.c.

Referenced by ff_h263_decode_mb().

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

static

Definition at line 586 of file ituh263dec.c.

Referenced by ff_h263_decode_mb().

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

Definition at line 604 of file ituh263dec.c.

Referenced by ff_h263_decode_init(), and rv10_decode_packet().

int ff_h263_decode_picture_header ( MpegEncContext * s )

Definition at line 870 of file ituh263dec.c.

Referenced by ff_h263_decode_frame().

Variable Documentation

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,
}