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/*
* 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
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