ituh263dec.c File Reference

#include "config_components.h"
#include "libavutil/attributes.h"
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/mathematics.h"
#include "libavutil/mem_internal.h"
#include "libavutil/thread.h"
#include "avcodec.h"
#include "mpegvideo.h"
#include "h263.h"
#include "h263data.h"
#include "h263dec.h"
#include "mathops.h"
#include "mpegutils.h"
#include "unary.h"
#include "rv10dec.h"
#include "mpeg4video.h"
#include "mpegvideodata.h"
#include "mpegvideodec.h"
#include "mpeg4videodec.h"
#include "mpeg4videodefs.h"

Go to the source code of this file.

Macros
#define	UNCHECKED_BITSTREAM_READER   1
#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, int h263_plus)
	Print picture info if FF_DEBUG_PICT_INFO is set. More...
static av_cold void	h263_decode_init_vlc (void)
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 void	h263_pred_acdc (MpegEncContext *s, int16_t *block, int n)
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, const MPVPicture *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 int16_t	h263_mb_type_b_map [15]
VLCElem	ff_h263_intra_MCBPC_vlc [72]
VLCElem	ff_h263_inter_MCBPC_vlc [198]
VLCElem	ff_h263_cbpy_vlc [64]
VLCElem	ff_h263_mv_vlc [538]
static VLCElem	h263_mbtype_b_vlc [80]
static VLCElem	cbpc_b_vlc [8]

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.

H263_MBTYPE_B_VLC_BITS

#define H263_MBTYPE_B_VLC_BITS   6

Definition at line 59 of file ituh263dec.c.

CBPC_B_VLC_BITS

#define CBPC_B_VLC_BITS   3

Definition at line 60 of file ituh263dec.c.

tab_size

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

Definition at line 721 of file ituh263dec.c.

tab_bias

#define tab_bias   (tab_size / 2)

Definition at line 722 of file ituh263dec.c.

Function Documentation

ff_h263_show_pict_info()

void ff_h263_show_pict_info	(	MpegEncContext *	s,
		int	h263_plus
	)

Print picture info if FF_DEBUG_PICT_INFO is set.

Definition at line 80 of file ituh263dec.c.

Referenced by ff_h263_decode_picture_header(), and ff_intel_h263_decode_picture_header().

h263_decode_init_vlc()

static av_cold void h263_decode_init_vlc ( void  )

static

Definition at line 112 of file ituh263dec.c.

Referenced by ff_h263_decode_init_vlc().

ff_h263_decode_init_vlc()

av_cold void ff_h263_decode_init_vlc

(

void

)

Definition at line 138 of file ituh263dec.c.

Referenced by ff_h263_decode_init().

ff_h263_decode_mba()

int ff_h263_decode_mba

(

MpegEncContext *

s

)

Definition at line 144 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 162 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 218 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 275 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 313 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 343 of file ituh263dec.c.

Referenced by ff_h263_decode_mb().

h263_decode_dquant()

static void h263_decode_dquant ( MpegEncContext *  s )

static

Definition at line 435 of file ituh263dec.c.

Referenced by ff_h263_decode_mb().

h263_pred_acdc()

static void h263_pred_acdc ( MpegEncContext *  s, int16_t *  block, int  n  )

static

Definition at line 448 of file ituh263dec.c.

Referenced by h263_decode_block().

h263_decode_block()

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

static

Definition at line 535 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 681 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 703 of file ituh263dec.c.

Referenced by ff_h263_decode_mb().

set_one_direct_mv()

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

inlinestatic

Definition at line 723 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 751 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 788 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 1089 of file ituh263dec.c.

Referenced by ff_h263_decode_frame().

Variable Documentation

h263_mb_type_b_map

const int16_t h263_mb_type_b_map[15]

static

Initial value:

= {
    MB_TYPE_DIRECT2 | MB_TYPE_BIDIR_MV,
    MB_TYPE_DIRECT2 | MB_TYPE_BIDIR_MV    | MB_TYPE_CBP,
    MB_TYPE_DIRECT2 | MB_TYPE_BIDIR_MV    | MB_TYPE_CBP | MB_TYPE_QUANT,
                      MB_TYPE_FORWARD_MV                                | MB_TYPE_16x16,
                      MB_TYPE_FORWARD_MV  | MB_TYPE_CBP                 | MB_TYPE_16x16,
                      MB_TYPE_FORWARD_MV  | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
                      MB_TYPE_BACKWARD_MV                               | MB_TYPE_16x16,
                      MB_TYPE_BACKWARD_MV | MB_TYPE_CBP                 | MB_TYPE_16x16,
                      MB_TYPE_BACKWARD_MV | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
                      MB_TYPE_BIDIR_MV                                  | MB_TYPE_16x16,
                      MB_TYPE_BIDIR_MV    | MB_TYPE_CBP                 | MB_TYPE_16x16,
                      MB_TYPE_BIDIR_MV    | 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 62 of file ituh263dec.c.

Referenced by h263_decode_init_vlc().

ff_h263_intra_MCBPC_vlc

VLCElem ff_h263_intra_MCBPC_vlc[72]

Definition at line 103 of file ituh263dec.c.

Referenced by ff_h263_decode_mb(), h263_decode_init_vlc(), mpeg4_decode_mb(), mpeg4_decode_partition_a(), and msmpeg4v12_decode_mb().

ff_h263_inter_MCBPC_vlc

VLCElem ff_h263_inter_MCBPC_vlc[198]

Definition at line 104 of file ituh263dec.c.

Referenced by ff_h263_decode_mb(), h263_decode_init_vlc(), mpeg4_decode_mb(), mpeg4_decode_partition_a(), msmpeg4v12_decode_mb(), and preview_obmc().

ff_h263_cbpy_vlc

VLCElem ff_h263_cbpy_vlc[64]

Definition at line 105 of file ituh263dec.c.

Referenced by ff_h263_decode_mb(), h263_decode_init_vlc(), mpeg4_decode_mb(), mpeg4_decode_partition_b(), msmpeg4v12_decode_mb(), and preview_obmc().

ff_h263_mv_vlc

VLCElem ff_h263_mv_vlc[538]

Definition at line 106 of file ituh263dec.c.

Referenced by ff_h263_decode_motion(), h263_decode_init_vlc(), and msmpeg4v2_decode_motion().

h263_mbtype_b_vlc

VLCElem h263_mbtype_b_vlc[80]

static

Definition at line 107 of file ituh263dec.c.

Referenced by ff_h263_decode_mb(), and h263_decode_init_vlc().

cbpc_b_vlc

VLCElem cbpc_b_vlc[8]

static

Definition at line 108 of file ituh263dec.c.

Referenced by ff_h263_decode_mb(), and h263_decode_init_vlc().