You've already forked FFmpeg
mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2025-11-23 21:54:53 +02:00
120 lines
4.0 KiB
C
120 lines
4.0 KiB
C
/*
|
|
* H.263 decoder internal header
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#ifndef AVCODEC_H263DEC_H
|
|
#define AVCODEC_H263DEC_H
|
|
|
|
#include "get_bits.h"
|
|
#include "mpegvideo.h"
|
|
#include "vlc.h"
|
|
#include "libavutil/mem_internal.h"
|
|
|
|
// The defines below define the number of bits that are read at once for
|
|
// reading vlc values. Changing these may improve speed and data cache needs
|
|
// be aware though that decreasing them may need the number of stages that is
|
|
// passed to get_vlc* to be increased.
|
|
#define H263_MV_VLC_BITS 9
|
|
#define INTRA_MCBPC_VLC_BITS 6
|
|
#define INTER_MCBPC_VLC_BITS 7
|
|
#define CBPY_VLC_BITS 6
|
|
#define TEX_VLC_BITS 9
|
|
|
|
extern VLCElem ff_h263_intra_MCBPC_vlc[];
|
|
extern VLCElem ff_h263_inter_MCBPC_vlc[];
|
|
extern VLCElem ff_h263_cbpy_vlc[];
|
|
extern VLCElem ff_h263_mv_vlc[];
|
|
|
|
typedef struct H263DecContext {
|
|
MPVContext c;
|
|
|
|
GetBitContext gb;
|
|
|
|
int mb_num_left; ///< number of MBs left in this video packet (for partitioned slices only)
|
|
|
|
int picture_number;
|
|
|
|
int pb_frame; ///< PB-frame mode (0 = none, 1 = base, 2 = improved)
|
|
|
|
/* motion compensation */
|
|
int h263_long_vectors; ///< use horrible H.263v1 long vector mode
|
|
|
|
/* FLV specific */
|
|
int flv; ///< use flv H.263 header
|
|
|
|
/* H.263 specific */
|
|
int ehc_mode;
|
|
int gob_index;
|
|
|
|
/* H.263+ specific */
|
|
int custom_pcf;
|
|
int umvplus; ///< == H.263+ && unrestricted_mv
|
|
int h263_slice_structured;
|
|
int alt_inter_vlc; ///< alternative inter vlc
|
|
int loop_filter;
|
|
int modified_quant;
|
|
|
|
/* MPEG-4 specific */
|
|
int padding_bug_score; ///< used to detect the VERY common padding bug in MPEG-4
|
|
int skipped_last_frame;
|
|
int divx_packed; ///< divx specific, used to workaround (many) bugs in divx5
|
|
int data_partitioning; ///< data partitioning flag from header
|
|
int partitioned_frame; ///< is current frame partitioned
|
|
|
|
/* MSMPEG4 specific */
|
|
int slice_height; ///< in macroblocks
|
|
|
|
/* RV10 specific */
|
|
int rv10_version; ///< RV10 version: 0 or 3
|
|
int rv10_first_dc_coded[3];
|
|
|
|
int (*decode_header)(struct H263DecContext *const h);
|
|
#define FRAME_SKIPPED 100 ///< Frame is not coded
|
|
|
|
int (*decode_mb)(struct H263DecContext *h);
|
|
#define SLICE_OK 0
|
|
#define SLICE_ERROR -1
|
|
#define SLICE_END -2 ///<end marker found
|
|
#define SLICE_NOEND -3 ///<no end marker or error found but mb count exceeded
|
|
|
|
GetBitContext last_resync_gb; ///< used to search for the next resync marker
|
|
|
|
DECLARE_ALIGNED_32(int16_t, block)[6][64];
|
|
} H263DecContext;
|
|
|
|
int ff_h263_decode_motion(H263DecContext *const h, int pred, int f_code);
|
|
int ff_h263_decode_init(AVCodecContext *avctx);
|
|
int ff_h263_decode_frame(AVCodecContext *avctx, AVFrame *frame,
|
|
int *got_frame, AVPacket *avpkt);
|
|
void ff_h263_decode_init_vlc(void);
|
|
int ff_h263_decode_picture_header(H263DecContext *const h);
|
|
int ff_h263_decode_gob_header(H263DecContext *const h);
|
|
int ff_h263_decode_mba(H263DecContext *const h);
|
|
|
|
/**
|
|
* Print picture info if FF_DEBUG_PICT_INFO is set.
|
|
*/
|
|
void ff_h263_show_pict_info(H263DecContext *const h, int h263_plus);
|
|
|
|
int ff_intel_h263_decode_picture_header(H263DecContext *const h);
|
|
int ff_h263_decode_mb(H263DecContext *const h);
|
|
|
|
int ff_h263_resync(H263DecContext *const h);
|
|
|
|
#endif
|