ituh263dec.c File Reference

H.263 decoder. More...

#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 (H263DecContext *const h, int h263_plus)
	Print picture info if FF_DEBUG_PICT_INFO is set.
static av_cold void	h263_decode_init_vlc (void)
av_cold void	ff_h263_decode_init_vlc (void)
int	ff_h263_decode_mba (H263DecContext *const h)
static int	h263_decode_gob_header (H263DecContext *const h)
	Decode the group of blocks header or slice header.
int	ff_h263_resync (H263DecContext *const h)
	Decode the group of blocks / video packet header / slice header (MPEG-4 Studio).
int	ff_h263_decode_motion (H263DecContext *const h, int pred, int f_code)
static int	h263p_decode_umotion (H263DecContext *const h, int pred)
static void	preview_obmc (H263DecContext *const h)
	read the next MVs for OBMC.
static void	h263_decode_dquant (H263DecContext *const h)
static void	h263_pred_acdc (MpegEncContext *s, int16_t *block, int n)
static int	h263_decode_block (H263DecContext *const h, int16_t block[64], int n, int coded)
static int	h263_skip_b_part (H263DecContext *const h, 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 (H263DecContext *const h)
int	ff_h263_decode_picture_header (H263DecContext *const h)

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.

Referenced by ff_h263_decode_mb(), and h263_decode_init_vlc().

CBPC_B_VLC_BITS

#define CBPC_B_VLC_BITS   3

Definition at line 60 of file ituh263dec.c.

Referenced by ff_h263_decode_mb(), and h263_decode_init_vlc().

tab_size

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

Definition at line 717 of file ituh263dec.c.

Referenced by ff_mpeg4_init_direct_mv(), ff_mpeg4_set_one_direct_mv(), and set_one_direct_mv().

tab_bias

#define tab_bias   (tab_size / 2)

Definition at line 718 of file ituh263dec.c.

Referenced by ff_mpeg4_init_direct_mv(), ff_mpeg4_set_one_direct_mv(), and set_one_direct_mv().

Function Documentation

ff_h263_show_pict_info()

void ff_h263_show_pict_info	(	H263DecContext *const	h,
		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 111 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 136 of file ituh263dec.c.

Referenced by ff_h263_decode_init().

ff_h263_decode_mba()

int ff_h263_decode_mba

(

H263DecContext *const

h

)

Definition at line 142 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 ( H263DecContext *const h )

static

Decode the group of blocks header or slice header.

Returns

<0 if an error occurred

Definition at line 160 of file ituh263dec.c.

Referenced by ff_h263_resync().

ff_h263_resync()

int ff_h263_resync

(

H263DecContext *const

h

)

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 217 of file ituh263dec.c.

Referenced by ff_h263_decode_frame().

ff_h263_decode_motion()

int ff_h263_decode_motion	(	H263DecContext *const	h,
		int	pred,
		int	f_code )

Definition at line 279 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 ( H263DecContext *const h, int pred )

static

Definition at line 317 of file ituh263dec.c.

Referenced by ff_h263_decode_mb(), and preview_obmc().

preview_obmc()

static void preview_obmc ( H263DecContext *const h )

static

read the next MVs for OBMC.

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

Definition at line 347 of file ituh263dec.c.

Referenced by ff_h263_decode_mb().

h263_decode_dquant()

static void h263_decode_dquant ( H263DecContext *const h )

static

Definition at line 436 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 451 of file ituh263dec.c.

Referenced by h263_decode_block().

h263_decode_block()

static int h263_decode_block ( H263DecContext *const h, int16_t block[64], int n, int coded )

static

Definition at line 529 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 ( H263DecContext *const h, int cbp )

static

Definition at line 677 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 699 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 719 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 747 of file ituh263dec.c.

Referenced by ff_h263_decode_mb().

ff_h263_decode_mb()

int ff_h263_decode_mb

(

H263DecContext *const

h

)

Definition at line 784 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

(

H263DecContext *const

h

)

Definition at line 1092 of file ituh263dec.c.

Referenced by ff_h263_decode_init().

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 102 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 103 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 104 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 105 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 106 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 107 of file ituh263dec.c.

Referenced by ff_h263_decode_mb(), and h263_decode_init_vlc().