H.263 decoder. More...

#include <limits.h>
#include "libavutil/attributes.h"
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/mathematics.h"
#include "avcodec.h"
#include "mpegvideo.h"
#include "h263.h"
#include "h263data.h"
#include "internal.h"
#include "mathops.h"
#include "mpegutils.h"
#include "unary.h"
#include "flv.h"
#include "rv10.h"
#include "mpeg4video.h"
#include "mpegvideodata.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

#define	tab_size ((signed)FF_ARRAY_ELEMS(s->direct_scale_mv[0]))

#define	tab_bias (tab_size / 2)

Functions
void	ff_h263_show_pict_info (MpegEncContext *s)
	Print picture info if FF_DEBUG_PICT_INFO is set. More...

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. More...

int	ff_h263_resync (MpegEncContext *s)
	Decode the group of blocks / video packet header / slice header (MPEG-4 Studio). 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)

static void	set_one_direct_mv (MpegEncContext s, Picture p, int i)

static int	set_direct_mv (MpegEncContext *s)

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

H.263 decoder.

Definition in file ituh263dec.c.

Macro Definition Documentation

◆ UNCHECKED_BITSTREAM_READER

#define UNCHECKED_BITSTREAM_READER 1

Definition at line 30 of file ituh263dec.c.

◆ MV_VLC_BITS

#define MV_VLC_BITS 9

Definition at line 54 of file ituh263dec.c.

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

◆ H263_MBTYPE_B_VLC_BITS

#define H263_MBTYPE_B_VLC_BITS 6

Definition at line 55 of file ituh263dec.c.

Referenced by ff_h263_decode_init_vlc(), and ff_h263_decode_mb().

◆ CBPC_B_VLC_BITS

#define CBPC_B_VLC_BITS 3

Definition at line 56 of file ituh263dec.c.

Referenced by ff_h263_decode_init_vlc(), and ff_h263_decode_mb().

◆ tab_size

#define tab_size ((signed)FF_ARRAY_ELEMS(s->direct_scale_mv[0]))

Definition at line 630 of file ituh263dec.c.

Referenced by set_one_direct_mv().

◆ tab_bias

#define tab_bias (tab_size / 2)

Definition at line 631 of file ituh263dec.c.

Referenced by set_one_direct_mv().

Function Documentation

◆ ff_h263_show_pict_info()

void ff_h263_show_pict_info ( MpegEncContext * s )

Print picture info if FF_DEBUG_PICT_INFO is set.

Definition at line 76 of file ituh263dec.c.

Referenced by ff_h263_decode_picture_header(), and ff_intel_h263_decode_picture_header().

◆ ff_h263_decode_init_vlc()

av_cold void ff_h263_decode_init_vlc ( void )

Definition at line 108 of file ituh263dec.c.

Referenced by ff_h263_decode_init(), and rv10_decode_init().

◆ ff_h263_decode_mba()

int ff_h263_decode_mba ( MpegEncContext * s )

Definition at line 139 of file ituh263dec.c.

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

◆ h263_decode_gob_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 157 of file ituh263dec.c.

Referenced by ff_h263_resync().

◆ ff_h263_resync()

int ff_h263_resync ( MpegEncContext * s )

Decode the group of blocks / video packet header / slice header (MPEG-4 Studio).

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

Definition at line 213 of file ituh263dec.c.

Referenced by ff_h263_decode_frame().

◆ ff_h263_decode_motion()

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

Definition at line 270 of file ituh263dec.c.

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

◆ h263p_decode_umotion()

static int h263p_decode_umotion	(	MpegEncContext *	s,
		int	pred
	)

static

Definition at line 308 of file ituh263dec.c.

Referenced by ff_h263_decode_mb(), and preview_obmc().

◆ preview_obmc()

static void preview_obmc ( MpegEncContext * s )

static

read the next MVs for OBMC.

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

Definition at line 338 of file ituh263dec.c.

Referenced by ff_h263_decode_mb().

◆ h263_decode_dquant()

static void h263_decode_dquant ( MpegEncContext * s )

static

Definition at line 430 of file ituh263dec.c.

Referenced by ff_h263_decode_mb().

◆ h263_decode_block()

static int h263_decode_block	(	MpegEncContext *	s,
		int16_t *	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().

◆ h263_skip_b_part()

static int h263_skip_b_part	(	MpegEncContext *	s,
		int	cbp
	)

static

Definition at line 590 of file ituh263dec.c.

Referenced by ff_h263_decode_mb().

◆ h263_get_modb()

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

static

Definition at line 612 of file ituh263dec.c.

Referenced by ff_h263_decode_mb().

◆ set_one_direct_mv()

static void set_one_direct_mv	(	MpegEncContext *	s,
		Picture *	p,
		int	i
	)

inlinestatic

Definition at line 632 of file ituh263dec.c.

Referenced by set_direct_mv().

◆ set_direct_mv()

static int set_direct_mv ( MpegEncContext * s )

static

Returns: the mb_type

Definition at line 660 of file ituh263dec.c.

Referenced by ff_h263_decode_mb().

◆ ff_h263_decode_mb()

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

Definition at line 697 of file ituh263dec.c.

Referenced by ff_h263_decode_init(), and rv10_decode_packet().

◆ ff_h263_decode_picture_header()

int ff_h263_decode_picture_header ( MpegEncContext * s )

Definition at line 999 of file ituh263dec.c.

Referenced by ff_h263_decode_frame().

Variable Documentation

◆ h263_mb_type_b_map

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 58 of file ituh263dec.c.

Referenced by ff_h263_decode_mb().

◆ ff_h263_intra_MCBPC_vlc

VLC ff_h263_intra_MCBPC_vlc

Definition at line 98 of file ituh263dec.c.

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

◆ ff_h263_inter_MCBPC_vlc

VLC ff_h263_inter_MCBPC_vlc

Definition at line 99 of file ituh263dec.c.

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

◆ ff_h263_cbpy_vlc

VLC ff_h263_cbpy_vlc

Definition at line 100 of file ituh263dec.c.

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

◆ mv_vlc

VLC mv_vlc

static

Definition at line 101 of file ituh263dec.c.

◆ h263_mbtype_b_vlc

VLC h263_mbtype_b_vlc

static

Definition at line 102 of file ituh263dec.c.

◆ cbpc_b_vlc

VLC cbpc_b_vlc

static

Definition at line 103 of file ituh263dec.c.

Macros

Functions

Variables

Detailed Description

Macro Definition Documentation

◆ UNCHECKED_BITSTREAM_READER

◆ MV_VLC_BITS

◆ H263_MBTYPE_B_VLC_BITS

◆ CBPC_B_VLC_BITS

◆ tab_size

◆ tab_bias

Function Documentation

◆ ff_h263_show_pict_info()

◆ ff_h263_decode_init_vlc()

◆ ff_h263_decode_mba()

◆ h263_decode_gob_header()

◆ ff_h263_resync()

◆ ff_h263_decode_motion()

◆ h263p_decode_umotion()

◆ preview_obmc()

◆ h263_decode_dquant()

◆ h263_decode_block()

◆ h263_skip_b_part()

◆ h263_get_modb()

◆ set_one_direct_mv()

◆ set_direct_mv()

◆ ff_h263_decode_mb()

◆ ff_h263_decode_picture_header()

Variable Documentation

◆ h263_mb_type_b_map

◆ ff_h263_intra_MCBPC_vlc

◆ ff_h263_inter_MCBPC_vlc

◆ ff_h263_cbpy_vlc

◆ mv_vlc

◆ h263_mbtype_b_vlc

◆ cbpc_b_vlc