mirror of https://git.ffmpeg.org/ffmpeg.git
2497 lines
83 KiB
C
2497 lines
83 KiB
C
/*
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* MPEG1/2 decoder
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* Copyright (c) 2000,2001 Fabrice Bellard.
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* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file mpeg12.c
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* MPEG1/2 decoder
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*/
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//#define DEBUG
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#include "avcodec.h"
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#include "dsputil.h"
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#include "mpegvideo.h"
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#include "mpeg12.h"
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#include "mpeg12data.h"
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#include "mpeg12decdata.h"
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#include "bytestream.h"
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//#undef NDEBUG
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//#include <assert.h>
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#define DC_VLC_BITS 9
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#define MV_VLC_BITS 9
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#define MBINCR_VLC_BITS 9
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#define MB_PAT_VLC_BITS 9
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#define MB_PTYPE_VLC_BITS 6
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#define MB_BTYPE_VLC_BITS 6
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#define TEX_VLC_BITS 9
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static inline int mpeg1_decode_block_inter(MpegEncContext *s,
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DCTELEM *block,
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int n);
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static inline int mpeg1_decode_block_intra(MpegEncContext *s,
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DCTELEM *block,
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int n);
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static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
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static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
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DCTELEM *block,
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int n);
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static inline int mpeg2_decode_block_intra(MpegEncContext *s,
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DCTELEM *block,
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int n);
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static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
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static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
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static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
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static void exchange_uv(MpegEncContext *s);
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extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
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extern int XVMC_field_end(MpegEncContext *s);
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extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
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extern void XVMC_init_block(MpegEncContext *s);//set s->block
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static const enum PixelFormat pixfmt_yuv_420[]= {PIX_FMT_YUV420P,-1};
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static const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,-1};
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static const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,-1};
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static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
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PIX_FMT_XVMC_MPEG2_IDCT,
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PIX_FMT_XVMC_MPEG2_MC,
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-1};
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uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
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static void init_2d_vlc_rl(RLTable *rl, int use_static)
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{
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int i;
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init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2,
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&rl->table_vlc[0][1], 4, 2,
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&rl->table_vlc[0][0], 4, 2, use_static);
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if(use_static)
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rl->rl_vlc[0]= av_mallocz_static(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
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else
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rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
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for(i=0; i<rl->vlc.table_size; i++){
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int code= rl->vlc.table[i][0];
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int len = rl->vlc.table[i][1];
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int level, run;
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if(len==0){ // illegal code
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run= 65;
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level= MAX_LEVEL;
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}else if(len<0){ //more bits needed
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run= 0;
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level= code;
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}else{
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if(code==rl->n){ //esc
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run= 65;
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level= 0;
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}else if(code==rl->n+1){ //eob
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run= 0;
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level= 127;
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}else{
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run= rl->table_run [code] + 1;
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level= rl->table_level[code];
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}
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}
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rl->rl_vlc[0][i].len= len;
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rl->rl_vlc[0][i].level= level;
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rl->rl_vlc[0][i].run= run;
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}
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}
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void ff_mpeg12_common_init(MpegEncContext *s)
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{
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s->y_dc_scale_table=
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s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
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}
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void ff_mpeg1_clean_buffers(MpegEncContext *s){
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s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
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s->last_dc[1] = s->last_dc[0];
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s->last_dc[2] = s->last_dc[0];
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memset(s->last_mv, 0, sizeof(s->last_mv));
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}
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/******************************************/
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/* decoding */
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static VLC dc_lum_vlc;
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static VLC dc_chroma_vlc;
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static VLC mv_vlc;
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static VLC mbincr_vlc;
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static VLC mb_ptype_vlc;
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static VLC mb_btype_vlc;
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static VLC mb_pat_vlc;
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static void init_vlcs(void)
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{
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static int done = 0;
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if (!done) {
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done = 1;
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init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
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ff_mpeg12_vlc_dc_lum_bits, 1, 1,
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ff_mpeg12_vlc_dc_lum_code, 2, 2, 1);
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init_vlc(&dc_chroma_vlc, DC_VLC_BITS, 12,
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ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
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ff_mpeg12_vlc_dc_chroma_code, 2, 2, 1);
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init_vlc(&mv_vlc, MV_VLC_BITS, 17,
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&ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
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&ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 1);
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init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
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&ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
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&ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 1);
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init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
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&ff_mpeg12_mbPatTable[0][1], 2, 1,
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&ff_mpeg12_mbPatTable[0][0], 2, 1, 1);
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init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
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&table_mb_ptype[0][1], 2, 1,
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&table_mb_ptype[0][0], 2, 1, 1);
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init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
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&table_mb_btype[0][1], 2, 1,
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&table_mb_btype[0][0], 2, 1, 1);
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init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
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init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
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init_2d_vlc_rl(&ff_rl_mpeg1, 1);
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init_2d_vlc_rl(&ff_rl_mpeg2, 1);
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}
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}
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static inline int get_dmv(MpegEncContext *s)
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{
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if(get_bits1(&s->gb))
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return 1 - (get_bits1(&s->gb) << 1);
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else
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return 0;
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}
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static inline int get_qscale(MpegEncContext *s)
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{
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int qscale = get_bits(&s->gb, 5);
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if (s->q_scale_type) {
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return non_linear_qscale[qscale];
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} else {
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return qscale << 1;
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}
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}
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/* motion type (for mpeg2) */
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#define MT_FIELD 1
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#define MT_FRAME 2
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#define MT_16X8 2
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#define MT_DMV 3
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static int mpeg_decode_mb(MpegEncContext *s,
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DCTELEM block[12][64])
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{
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int i, j, k, cbp, val, mb_type, motion_type;
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const int mb_block_count = 4 + (1<< s->chroma_format);
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dprintf(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
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assert(s->mb_skipped==0);
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if (s->mb_skip_run-- != 0) {
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if (s->pict_type == P_TYPE) {
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s->mb_skipped = 1;
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s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
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} else {
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int mb_type;
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if(s->mb_x)
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mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
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else
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mb_type= s->current_picture.mb_type[ s->mb_width + (s->mb_y-1)*s->mb_stride - 1]; // FIXME not sure if this is allowed in mpeg at all,
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if(IS_INTRA(mb_type))
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return -1;
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s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
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mb_type | MB_TYPE_SKIP;
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// assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
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if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
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s->mb_skipped = 1;
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}
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return 0;
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}
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switch(s->pict_type) {
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default:
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case I_TYPE:
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if (get_bits1(&s->gb) == 0) {
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if (get_bits1(&s->gb) == 0){
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av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
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return -1;
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}
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mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
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} else {
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mb_type = MB_TYPE_INTRA;
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}
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break;
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case P_TYPE:
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mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
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if (mb_type < 0){
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av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
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return -1;
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}
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mb_type = ptype2mb_type[ mb_type ];
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break;
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case B_TYPE:
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mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
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if (mb_type < 0){
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av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
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return -1;
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}
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mb_type = btype2mb_type[ mb_type ];
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break;
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}
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dprintf(s->avctx, "mb_type=%x\n", mb_type);
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// motion_type = 0; /* avoid warning */
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if (IS_INTRA(mb_type)) {
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s->dsp.clear_blocks(s->block[0]);
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if(!s->chroma_y_shift){
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s->dsp.clear_blocks(s->block[6]);
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}
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/* compute dct type */
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if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
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!s->frame_pred_frame_dct) {
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s->interlaced_dct = get_bits1(&s->gb);
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}
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if (IS_QUANT(mb_type))
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s->qscale = get_qscale(s);
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if (s->concealment_motion_vectors) {
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/* just parse them */
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if (s->picture_structure != PICT_FRAME)
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skip_bits1(&s->gb); /* field select */
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s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
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mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
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s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
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mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
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skip_bits1(&s->gb); /* marker */
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}else
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memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
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s->mb_intra = 1;
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#ifdef HAVE_XVMC
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//one 1 we memcpy blocks in xvmcvideo
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if(s->avctx->xvmc_acceleration > 1){
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XVMC_pack_pblocks(s,-1);//inter are always full blocks
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if(s->swap_uv){
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exchange_uv(s);
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}
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}
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#endif
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if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
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if(s->flags2 & CODEC_FLAG2_FAST){
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for(i=0;i<6;i++) {
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mpeg2_fast_decode_block_intra(s, s->pblocks[i], i);
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}
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}else{
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for(i=0;i<mb_block_count;i++) {
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if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
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return -1;
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}
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}
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} else {
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for(i=0;i<6;i++) {
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if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
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return -1;
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}
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}
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} else {
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if (mb_type & MB_TYPE_ZERO_MV){
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assert(mb_type & MB_TYPE_CBP);
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s->mv_dir = MV_DIR_FORWARD;
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if(s->picture_structure == PICT_FRAME){
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if(!s->frame_pred_frame_dct)
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s->interlaced_dct = get_bits1(&s->gb);
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s->mv_type = MV_TYPE_16X16;
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}else{
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s->mv_type = MV_TYPE_FIELD;
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mb_type |= MB_TYPE_INTERLACED;
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s->field_select[0][0]= s->picture_structure - 1;
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}
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if (IS_QUANT(mb_type))
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s->qscale = get_qscale(s);
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s->last_mv[0][0][0] = 0;
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s->last_mv[0][0][1] = 0;
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s->last_mv[0][1][0] = 0;
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s->last_mv[0][1][1] = 0;
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s->mv[0][0][0] = 0;
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s->mv[0][0][1] = 0;
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}else{
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assert(mb_type & MB_TYPE_L0L1);
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//FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
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/* get additional motion vector type */
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if (s->frame_pred_frame_dct)
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motion_type = MT_FRAME;
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else{
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motion_type = get_bits(&s->gb, 2);
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if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
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s->interlaced_dct = get_bits1(&s->gb);
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}
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if (IS_QUANT(mb_type))
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s->qscale = get_qscale(s);
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/* motion vectors */
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s->mv_dir= (mb_type>>13)&3;
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dprintf(s->avctx, "motion_type=%d\n", motion_type);
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switch(motion_type) {
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case MT_FRAME: /* or MT_16X8 */
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if (s->picture_structure == PICT_FRAME) {
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mb_type |= MB_TYPE_16x16;
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s->mv_type = MV_TYPE_16X16;
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for(i=0;i<2;i++) {
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if (USES_LIST(mb_type, i)) {
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/* MT_FRAME */
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s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
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mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
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s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
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mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
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/* full_pel: only for mpeg1 */
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if (s->full_pel[i]){
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s->mv[i][0][0] <<= 1;
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s->mv[i][0][1] <<= 1;
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}
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}
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}
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} else {
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mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
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s->mv_type = MV_TYPE_16X8;
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for(i=0;i<2;i++) {
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if (USES_LIST(mb_type, i)) {
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/* MT_16X8 */
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for(j=0;j<2;j++) {
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s->field_select[i][j] = get_bits1(&s->gb);
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for(k=0;k<2;k++) {
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val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
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s->last_mv[i][j][k]);
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s->last_mv[i][j][k] = val;
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s->mv[i][j][k] = val;
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}
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}
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}
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}
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}
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break;
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case MT_FIELD:
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s->mv_type = MV_TYPE_FIELD;
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if (s->picture_structure == PICT_FRAME) {
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mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
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for(i=0;i<2;i++) {
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if (USES_LIST(mb_type, i)) {
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for(j=0;j<2;j++) {
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s->field_select[i][j] = get_bits1(&s->gb);
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val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
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s->last_mv[i][j][0]);
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s->last_mv[i][j][0] = val;
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s->mv[i][j][0] = val;
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dprintf(s->avctx, "fmx=%d\n", val);
|
|
val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
|
|
s->last_mv[i][j][1] >> 1);
|
|
s->last_mv[i][j][1] = val << 1;
|
|
s->mv[i][j][1] = val;
|
|
dprintf(s->avctx, "fmy=%d\n", val);
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
|
|
for(i=0;i<2;i++) {
|
|
if (USES_LIST(mb_type, i)) {
|
|
s->field_select[i][0] = get_bits1(&s->gb);
|
|
for(k=0;k<2;k++) {
|
|
val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
|
|
s->last_mv[i][0][k]);
|
|
s->last_mv[i][0][k] = val;
|
|
s->last_mv[i][1][k] = val;
|
|
s->mv[i][0][k] = val;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
case MT_DMV:
|
|
s->mv_type = MV_TYPE_DMV;
|
|
for(i=0;i<2;i++) {
|
|
if (USES_LIST(mb_type, i)) {
|
|
int dmx, dmy, mx, my, m;
|
|
mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
|
|
s->last_mv[i][0][0]);
|
|
s->last_mv[i][0][0] = mx;
|
|
s->last_mv[i][1][0] = mx;
|
|
dmx = get_dmv(s);
|
|
my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
|
|
s->last_mv[i][0][1] >> 1);
|
|
dmy = get_dmv(s);
|
|
|
|
|
|
s->last_mv[i][0][1] = my<<1;
|
|
s->last_mv[i][1][1] = my<<1;
|
|
|
|
s->mv[i][0][0] = mx;
|
|
s->mv[i][0][1] = my;
|
|
s->mv[i][1][0] = mx;//not used
|
|
s->mv[i][1][1] = my;//not used
|
|
|
|
if (s->picture_structure == PICT_FRAME) {
|
|
mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
|
|
|
|
//m = 1 + 2 * s->top_field_first;
|
|
m = s->top_field_first ? 1 : 3;
|
|
|
|
/* top -> top pred */
|
|
s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
|
|
s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
|
|
m = 4 - m;
|
|
s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
|
|
s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
|
|
} else {
|
|
mb_type |= MB_TYPE_16x16;
|
|
|
|
s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
|
|
s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
|
|
if(s->picture_structure == PICT_TOP_FIELD)
|
|
s->mv[i][2][1]--;
|
|
else
|
|
s->mv[i][2][1]++;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
s->mb_intra = 0;
|
|
if (HAS_CBP(mb_type)) {
|
|
s->dsp.clear_blocks(s->block[0]);
|
|
|
|
cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
|
|
if(mb_block_count > 6){
|
|
cbp<<= mb_block_count-6;
|
|
cbp |= get_bits(&s->gb, mb_block_count-6);
|
|
s->dsp.clear_blocks(s->block[6]);
|
|
}
|
|
if (cbp <= 0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
|
|
#ifdef HAVE_XVMC
|
|
//on 1 we memcpy blocks in xvmcvideo
|
|
if(s->avctx->xvmc_acceleration > 1){
|
|
XVMC_pack_pblocks(s,cbp);
|
|
if(s->swap_uv){
|
|
exchange_uv(s);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
|
|
if(s->flags2 & CODEC_FLAG2_FAST){
|
|
for(i=0;i<6;i++) {
|
|
if(cbp & 32) {
|
|
mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
|
|
} else {
|
|
s->block_last_index[i] = -1;
|
|
}
|
|
cbp+=cbp;
|
|
}
|
|
}else{
|
|
cbp<<= 12-mb_block_count;
|
|
|
|
for(i=0;i<mb_block_count;i++) {
|
|
if ( cbp & (1<<11) ) {
|
|
if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
|
|
return -1;
|
|
} else {
|
|
s->block_last_index[i] = -1;
|
|
}
|
|
cbp+=cbp;
|
|
}
|
|
}
|
|
} else {
|
|
if(s->flags2 & CODEC_FLAG2_FAST){
|
|
for(i=0;i<6;i++) {
|
|
if (cbp & 32) {
|
|
mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
|
|
} else {
|
|
s->block_last_index[i] = -1;
|
|
}
|
|
cbp+=cbp;
|
|
}
|
|
}else{
|
|
for(i=0;i<6;i++) {
|
|
if (cbp & 32) {
|
|
if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
|
|
return -1;
|
|
} else {
|
|
s->block_last_index[i] = -1;
|
|
}
|
|
cbp+=cbp;
|
|
}
|
|
}
|
|
}
|
|
}else{
|
|
for(i=0;i<12;i++)
|
|
s->block_last_index[i] = -1;
|
|
}
|
|
}
|
|
|
|
s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* as h263, but only 17 codes */
|
|
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
|
|
{
|
|
int code, sign, val, l, shift;
|
|
|
|
code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
|
|
if (code == 0) {
|
|
return pred;
|
|
}
|
|
if (code < 0) {
|
|
return 0xffff;
|
|
}
|
|
|
|
sign = get_bits1(&s->gb);
|
|
shift = fcode - 1;
|
|
val = code;
|
|
if (shift) {
|
|
val = (val - 1) << shift;
|
|
val |= get_bits(&s->gb, shift);
|
|
val++;
|
|
}
|
|
if (sign)
|
|
val = -val;
|
|
val += pred;
|
|
|
|
/* modulo decoding */
|
|
l= INT_BIT - 5 - shift;
|
|
val = (val<<l)>>l;
|
|
return val;
|
|
}
|
|
|
|
static inline int decode_dc(GetBitContext *gb, int component)
|
|
{
|
|
int code, diff;
|
|
|
|
if (component == 0) {
|
|
code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
|
|
} else {
|
|
code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
|
|
}
|
|
if (code < 0){
|
|
av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
|
|
return 0xffff;
|
|
}
|
|
if (code == 0) {
|
|
diff = 0;
|
|
} else {
|
|
diff = get_xbits(gb, code);
|
|
}
|
|
return diff;
|
|
}
|
|
|
|
static inline int mpeg1_decode_block_intra(MpegEncContext *s,
|
|
DCTELEM *block,
|
|
int n)
|
|
{
|
|
int level, dc, diff, i, j, run;
|
|
int component;
|
|
RLTable *rl = &ff_rl_mpeg1;
|
|
uint8_t * const scantable= s->intra_scantable.permutated;
|
|
const uint16_t *quant_matrix= s->intra_matrix;
|
|
const int qscale= s->qscale;
|
|
|
|
/* DC coef */
|
|
component = (n <= 3 ? 0 : n - 4 + 1);
|
|
diff = decode_dc(&s->gb, component);
|
|
if (diff >= 0xffff)
|
|
return -1;
|
|
dc = s->last_dc[component];
|
|
dc += diff;
|
|
s->last_dc[component] = dc;
|
|
block[0] = dc<<3;
|
|
dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
|
|
i = 0;
|
|
{
|
|
OPEN_READER(re, &s->gb);
|
|
/* now quantify & encode AC coefs */
|
|
for(;;) {
|
|
UPDATE_CACHE(re, &s->gb);
|
|
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
|
|
|
|
if(level == 127){
|
|
break;
|
|
} else if(level != 0) {
|
|
i += run;
|
|
j = scantable[i];
|
|
level= (level*qscale*quant_matrix[j])>>4;
|
|
level= (level-1)|1;
|
|
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
|
|
LAST_SKIP_BITS(re, &s->gb, 1);
|
|
} else {
|
|
/* escape */
|
|
run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
|
|
UPDATE_CACHE(re, &s->gb);
|
|
level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
|
|
if (level == -128) {
|
|
level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
|
|
} else if (level == 0) {
|
|
level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
|
|
}
|
|
i += run;
|
|
j = scantable[i];
|
|
if(level<0){
|
|
level= -level;
|
|
level= (level*qscale*quant_matrix[j])>>4;
|
|
level= (level-1)|1;
|
|
level= -level;
|
|
}else{
|
|
level= (level*qscale*quant_matrix[j])>>4;
|
|
level= (level-1)|1;
|
|
}
|
|
}
|
|
if (i > 63){
|
|
av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
|
|
block[j] = level;
|
|
}
|
|
CLOSE_READER(re, &s->gb);
|
|
}
|
|
s->block_last_index[n] = i;
|
|
return 0;
|
|
}
|
|
|
|
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
|
|
DCTELEM *block,
|
|
int n)
|
|
{
|
|
int level, i, j, run;
|
|
RLTable *rl = &ff_rl_mpeg1;
|
|
uint8_t * const scantable= s->intra_scantable.permutated;
|
|
const uint16_t *quant_matrix= s->inter_matrix;
|
|
const int qscale= s->qscale;
|
|
|
|
{
|
|
OPEN_READER(re, &s->gb);
|
|
i = -1;
|
|
/* special case for the first coef. no need to add a second vlc table */
|
|
UPDATE_CACHE(re, &s->gb);
|
|
if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
|
|
level= (3*qscale*quant_matrix[0])>>5;
|
|
level= (level-1)|1;
|
|
if(GET_CACHE(re, &s->gb)&0x40000000)
|
|
level= -level;
|
|
block[0] = level;
|
|
i++;
|
|
SKIP_BITS(re, &s->gb, 2);
|
|
if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
|
|
goto end;
|
|
}
|
|
#if MIN_CACHE_BITS < 19
|
|
UPDATE_CACHE(re, &s->gb);
|
|
#endif
|
|
/* now quantify & encode AC coefs */
|
|
for(;;) {
|
|
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
|
|
|
|
if(level != 0) {
|
|
i += run;
|
|
j = scantable[i];
|
|
level= ((level*2+1)*qscale*quant_matrix[j])>>5;
|
|
level= (level-1)|1;
|
|
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
|
|
SKIP_BITS(re, &s->gb, 1);
|
|
} else {
|
|
/* escape */
|
|
run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
|
|
UPDATE_CACHE(re, &s->gb);
|
|
level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
|
|
if (level == -128) {
|
|
level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
|
|
} else if (level == 0) {
|
|
level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
|
|
}
|
|
i += run;
|
|
j = scantable[i];
|
|
if(level<0){
|
|
level= -level;
|
|
level= ((level*2+1)*qscale*quant_matrix[j])>>5;
|
|
level= (level-1)|1;
|
|
level= -level;
|
|
}else{
|
|
level= ((level*2+1)*qscale*quant_matrix[j])>>5;
|
|
level= (level-1)|1;
|
|
}
|
|
}
|
|
if (i > 63){
|
|
av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
|
|
block[j] = level;
|
|
#if MIN_CACHE_BITS < 19
|
|
UPDATE_CACHE(re, &s->gb);
|
|
#endif
|
|
if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
|
|
break;
|
|
#if MIN_CACHE_BITS >= 19
|
|
UPDATE_CACHE(re, &s->gb);
|
|
#endif
|
|
}
|
|
end:
|
|
LAST_SKIP_BITS(re, &s->gb, 2);
|
|
CLOSE_READER(re, &s->gb);
|
|
}
|
|
s->block_last_index[n] = i;
|
|
return 0;
|
|
}
|
|
|
|
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
|
|
{
|
|
int level, i, j, run;
|
|
RLTable *rl = &ff_rl_mpeg1;
|
|
uint8_t * const scantable= s->intra_scantable.permutated;
|
|
const int qscale= s->qscale;
|
|
|
|
{
|
|
OPEN_READER(re, &s->gb);
|
|
i = -1;
|
|
/* special case for the first coef. no need to add a second vlc table */
|
|
UPDATE_CACHE(re, &s->gb);
|
|
if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
|
|
level= (3*qscale)>>1;
|
|
level= (level-1)|1;
|
|
if(GET_CACHE(re, &s->gb)&0x40000000)
|
|
level= -level;
|
|
block[0] = level;
|
|
i++;
|
|
SKIP_BITS(re, &s->gb, 2);
|
|
if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
|
|
goto end;
|
|
}
|
|
#if MIN_CACHE_BITS < 19
|
|
UPDATE_CACHE(re, &s->gb);
|
|
#endif
|
|
|
|
/* now quantify & encode AC coefs */
|
|
for(;;) {
|
|
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
|
|
|
|
if(level != 0) {
|
|
i += run;
|
|
j = scantable[i];
|
|
level= ((level*2+1)*qscale)>>1;
|
|
level= (level-1)|1;
|
|
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
|
|
SKIP_BITS(re, &s->gb, 1);
|
|
} else {
|
|
/* escape */
|
|
run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
|
|
UPDATE_CACHE(re, &s->gb);
|
|
level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
|
|
if (level == -128) {
|
|
level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
|
|
} else if (level == 0) {
|
|
level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
|
|
}
|
|
i += run;
|
|
j = scantable[i];
|
|
if(level<0){
|
|
level= -level;
|
|
level= ((level*2+1)*qscale)>>1;
|
|
level= (level-1)|1;
|
|
level= -level;
|
|
}else{
|
|
level= ((level*2+1)*qscale)>>1;
|
|
level= (level-1)|1;
|
|
}
|
|
}
|
|
|
|
block[j] = level;
|
|
#if MIN_CACHE_BITS < 19
|
|
UPDATE_CACHE(re, &s->gb);
|
|
#endif
|
|
if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
|
|
break;
|
|
#if MIN_CACHE_BITS >= 19
|
|
UPDATE_CACHE(re, &s->gb);
|
|
#endif
|
|
}
|
|
end:
|
|
LAST_SKIP_BITS(re, &s->gb, 2);
|
|
CLOSE_READER(re, &s->gb);
|
|
}
|
|
s->block_last_index[n] = i;
|
|
return 0;
|
|
}
|
|
|
|
|
|
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
|
|
DCTELEM *block,
|
|
int n)
|
|
{
|
|
int level, i, j, run;
|
|
RLTable *rl = &ff_rl_mpeg1;
|
|
uint8_t * const scantable= s->intra_scantable.permutated;
|
|
const uint16_t *quant_matrix;
|
|
const int qscale= s->qscale;
|
|
int mismatch;
|
|
|
|
mismatch = 1;
|
|
|
|
{
|
|
OPEN_READER(re, &s->gb);
|
|
i = -1;
|
|
if (n < 4)
|
|
quant_matrix = s->inter_matrix;
|
|
else
|
|
quant_matrix = s->chroma_inter_matrix;
|
|
|
|
/* special case for the first coef. no need to add a second vlc table */
|
|
UPDATE_CACHE(re, &s->gb);
|
|
if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
|
|
level= (3*qscale*quant_matrix[0])>>5;
|
|
if(GET_CACHE(re, &s->gb)&0x40000000)
|
|
level= -level;
|
|
block[0] = level;
|
|
mismatch ^= level;
|
|
i++;
|
|
SKIP_BITS(re, &s->gb, 2);
|
|
if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
|
|
goto end;
|
|
}
|
|
#if MIN_CACHE_BITS < 19
|
|
UPDATE_CACHE(re, &s->gb);
|
|
#endif
|
|
|
|
/* now quantify & encode AC coefs */
|
|
for(;;) {
|
|
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
|
|
|
|
if(level != 0) {
|
|
i += run;
|
|
j = scantable[i];
|
|
level= ((level*2+1)*qscale*quant_matrix[j])>>5;
|
|
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
|
|
SKIP_BITS(re, &s->gb, 1);
|
|
} else {
|
|
/* escape */
|
|
run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
|
|
UPDATE_CACHE(re, &s->gb);
|
|
level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
|
|
|
|
i += run;
|
|
j = scantable[i];
|
|
if(level<0){
|
|
level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
|
|
level= -level;
|
|
}else{
|
|
level= ((level*2+1)*qscale*quant_matrix[j])>>5;
|
|
}
|
|
}
|
|
if (i > 63){
|
|
av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
|
|
mismatch ^= level;
|
|
block[j] = level;
|
|
#if MIN_CACHE_BITS < 19
|
|
UPDATE_CACHE(re, &s->gb);
|
|
#endif
|
|
if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
|
|
break;
|
|
#if MIN_CACHE_BITS >= 19
|
|
UPDATE_CACHE(re, &s->gb);
|
|
#endif
|
|
}
|
|
end:
|
|
LAST_SKIP_BITS(re, &s->gb, 2);
|
|
CLOSE_READER(re, &s->gb);
|
|
}
|
|
block[63] ^= (mismatch & 1);
|
|
|
|
s->block_last_index[n] = i;
|
|
return 0;
|
|
}
|
|
|
|
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
|
|
DCTELEM *block,
|
|
int n)
|
|
{
|
|
int level, i, j, run;
|
|
RLTable *rl = &ff_rl_mpeg1;
|
|
uint8_t * const scantable= s->intra_scantable.permutated;
|
|
const int qscale= s->qscale;
|
|
OPEN_READER(re, &s->gb);
|
|
i = -1;
|
|
|
|
/* special case for the first coef. no need to add a second vlc table */
|
|
UPDATE_CACHE(re, &s->gb);
|
|
if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
|
|
level= (3*qscale)>>1;
|
|
if(GET_CACHE(re, &s->gb)&0x40000000)
|
|
level= -level;
|
|
block[0] = level;
|
|
i++;
|
|
SKIP_BITS(re, &s->gb, 2);
|
|
if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
|
|
goto end;
|
|
}
|
|
#if MIN_CACHE_BITS < 19
|
|
UPDATE_CACHE(re, &s->gb);
|
|
#endif
|
|
|
|
/* now quantify & encode AC coefs */
|
|
for(;;) {
|
|
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
|
|
|
|
if(level != 0) {
|
|
i += run;
|
|
j = scantable[i];
|
|
level= ((level*2+1)*qscale)>>1;
|
|
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
|
|
SKIP_BITS(re, &s->gb, 1);
|
|
} else {
|
|
/* escape */
|
|
run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
|
|
UPDATE_CACHE(re, &s->gb);
|
|
level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
|
|
|
|
i += run;
|
|
j = scantable[i];
|
|
if(level<0){
|
|
level= ((-level*2+1)*qscale)>>1;
|
|
level= -level;
|
|
}else{
|
|
level= ((level*2+1)*qscale)>>1;
|
|
}
|
|
}
|
|
|
|
block[j] = level;
|
|
#if MIN_CACHE_BITS < 19
|
|
UPDATE_CACHE(re, &s->gb);
|
|
#endif
|
|
if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
|
|
break;
|
|
#if MIN_CACHE_BITS >=19
|
|
UPDATE_CACHE(re, &s->gb);
|
|
#endif
|
|
}
|
|
end:
|
|
LAST_SKIP_BITS(re, &s->gb, 2);
|
|
CLOSE_READER(re, &s->gb);
|
|
s->block_last_index[n] = i;
|
|
return 0;
|
|
}
|
|
|
|
|
|
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
|
|
DCTELEM *block,
|
|
int n)
|
|
{
|
|
int level, dc, diff, i, j, run;
|
|
int component;
|
|
RLTable *rl;
|
|
uint8_t * const scantable= s->intra_scantable.permutated;
|
|
const uint16_t *quant_matrix;
|
|
const int qscale= s->qscale;
|
|
int mismatch;
|
|
|
|
/* DC coef */
|
|
if (n < 4){
|
|
quant_matrix = s->intra_matrix;
|
|
component = 0;
|
|
}else{
|
|
quant_matrix = s->chroma_intra_matrix;
|
|
component = (n&1) + 1;
|
|
}
|
|
diff = decode_dc(&s->gb, component);
|
|
if (diff >= 0xffff)
|
|
return -1;
|
|
dc = s->last_dc[component];
|
|
dc += diff;
|
|
s->last_dc[component] = dc;
|
|
block[0] = dc << (3 - s->intra_dc_precision);
|
|
dprintf(s->avctx, "dc=%d\n", block[0]);
|
|
mismatch = block[0] ^ 1;
|
|
i = 0;
|
|
if (s->intra_vlc_format)
|
|
rl = &ff_rl_mpeg2;
|
|
else
|
|
rl = &ff_rl_mpeg1;
|
|
|
|
{
|
|
OPEN_READER(re, &s->gb);
|
|
/* now quantify & encode AC coefs */
|
|
for(;;) {
|
|
UPDATE_CACHE(re, &s->gb);
|
|
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
|
|
|
|
if(level == 127){
|
|
break;
|
|
} else if(level != 0) {
|
|
i += run;
|
|
j = scantable[i];
|
|
level= (level*qscale*quant_matrix[j])>>4;
|
|
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
|
|
LAST_SKIP_BITS(re, &s->gb, 1);
|
|
} else {
|
|
/* escape */
|
|
run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
|
|
UPDATE_CACHE(re, &s->gb);
|
|
level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
|
|
i += run;
|
|
j = scantable[i];
|
|
if(level<0){
|
|
level= (-level*qscale*quant_matrix[j])>>4;
|
|
level= -level;
|
|
}else{
|
|
level= (level*qscale*quant_matrix[j])>>4;
|
|
}
|
|
}
|
|
if (i > 63){
|
|
av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
|
|
mismatch^= level;
|
|
block[j] = level;
|
|
}
|
|
CLOSE_READER(re, &s->gb);
|
|
}
|
|
block[63]^= mismatch&1;
|
|
|
|
s->block_last_index[n] = i;
|
|
return 0;
|
|
}
|
|
|
|
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
|
|
DCTELEM *block,
|
|
int n)
|
|
{
|
|
int level, dc, diff, j, run;
|
|
int component;
|
|
RLTable *rl;
|
|
uint8_t * scantable= s->intra_scantable.permutated;
|
|
const uint16_t *quant_matrix;
|
|
const int qscale= s->qscale;
|
|
|
|
/* DC coef */
|
|
if (n < 4){
|
|
quant_matrix = s->intra_matrix;
|
|
component = 0;
|
|
}else{
|
|
quant_matrix = s->chroma_intra_matrix;
|
|
component = (n&1) + 1;
|
|
}
|
|
diff = decode_dc(&s->gb, component);
|
|
if (diff >= 0xffff)
|
|
return -1;
|
|
dc = s->last_dc[component];
|
|
dc += diff;
|
|
s->last_dc[component] = dc;
|
|
block[0] = dc << (3 - s->intra_dc_precision);
|
|
if (s->intra_vlc_format)
|
|
rl = &ff_rl_mpeg2;
|
|
else
|
|
rl = &ff_rl_mpeg1;
|
|
|
|
{
|
|
OPEN_READER(re, &s->gb);
|
|
/* now quantify & encode AC coefs */
|
|
for(;;) {
|
|
UPDATE_CACHE(re, &s->gb);
|
|
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
|
|
|
|
if(level == 127){
|
|
break;
|
|
} else if(level != 0) {
|
|
scantable += run;
|
|
j = *scantable;
|
|
level= (level*qscale*quant_matrix[j])>>4;
|
|
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
|
|
LAST_SKIP_BITS(re, &s->gb, 1);
|
|
} else {
|
|
/* escape */
|
|
run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
|
|
UPDATE_CACHE(re, &s->gb);
|
|
level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
|
|
scantable += run;
|
|
j = *scantable;
|
|
if(level<0){
|
|
level= (-level*qscale*quant_matrix[j])>>4;
|
|
level= -level;
|
|
}else{
|
|
level= (level*qscale*quant_matrix[j])>>4;
|
|
}
|
|
}
|
|
|
|
block[j] = level;
|
|
}
|
|
CLOSE_READER(re, &s->gb);
|
|
}
|
|
|
|
s->block_last_index[n] = scantable - s->intra_scantable.permutated;
|
|
return 0;
|
|
}
|
|
|
|
typedef struct Mpeg1Context {
|
|
MpegEncContext mpeg_enc_ctx;
|
|
int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
|
|
int repeat_field; /* true if we must repeat the field */
|
|
AVPanScan pan_scan; /** some temporary storage for the panscan */
|
|
int slice_count;
|
|
int swap_uv;//indicate VCR2
|
|
int save_aspect_info;
|
|
int save_width, save_height;
|
|
AVRational frame_rate_ext; ///< MPEG-2 specific framerate modificator
|
|
|
|
} Mpeg1Context;
|
|
|
|
static int mpeg_decode_init(AVCodecContext *avctx)
|
|
{
|
|
Mpeg1Context *s = avctx->priv_data;
|
|
MpegEncContext *s2 = &s->mpeg_enc_ctx;
|
|
int i;
|
|
|
|
//we need some parmutation to store
|
|
//matrixes, until MPV_common_init()
|
|
//set the real permutatuon
|
|
for(i=0;i<64;i++)
|
|
s2->dsp.idct_permutation[i]=i;
|
|
|
|
MPV_decode_defaults(s2);
|
|
|
|
s->mpeg_enc_ctx.avctx= avctx;
|
|
s->mpeg_enc_ctx.flags= avctx->flags;
|
|
s->mpeg_enc_ctx.flags2= avctx->flags2;
|
|
ff_mpeg12_common_init(&s->mpeg_enc_ctx);
|
|
init_vlcs();
|
|
|
|
s->mpeg_enc_ctx_allocated = 0;
|
|
s->mpeg_enc_ctx.picture_number = 0;
|
|
s->repeat_field = 0;
|
|
s->mpeg_enc_ctx.codec_id= avctx->codec->id;
|
|
return 0;
|
|
}
|
|
|
|
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
|
|
const uint8_t *new_perm){
|
|
uint16_t temp_matrix[64];
|
|
int i;
|
|
|
|
memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
|
|
|
|
for(i=0;i<64;i++){
|
|
matrix[new_perm[i]] = temp_matrix[old_perm[i]];
|
|
}
|
|
}
|
|
|
|
//Call this function when we know all parameters
|
|
//it may be called in different places for mpeg1 and mpeg2
|
|
static int mpeg_decode_postinit(AVCodecContext *avctx){
|
|
Mpeg1Context *s1 = avctx->priv_data;
|
|
MpegEncContext *s = &s1->mpeg_enc_ctx;
|
|
uint8_t old_permutation[64];
|
|
|
|
if (
|
|
(s1->mpeg_enc_ctx_allocated == 0)||
|
|
avctx->coded_width != s->width ||
|
|
avctx->coded_height != s->height||
|
|
s1->save_width != s->width ||
|
|
s1->save_height != s->height ||
|
|
s1->save_aspect_info != s->aspect_ratio_info||
|
|
0)
|
|
{
|
|
|
|
if (s1->mpeg_enc_ctx_allocated) {
|
|
ParseContext pc= s->parse_context;
|
|
s->parse_context.buffer=0;
|
|
MPV_common_end(s);
|
|
s->parse_context= pc;
|
|
}
|
|
|
|
if( (s->width == 0 )||(s->height == 0))
|
|
return -2;
|
|
|
|
avcodec_set_dimensions(avctx, s->width, s->height);
|
|
avctx->bit_rate = s->bit_rate;
|
|
s1->save_aspect_info = s->aspect_ratio_info;
|
|
s1->save_width = s->width;
|
|
s1->save_height = s->height;
|
|
|
|
//low_delay may be forced, in this case we will have B frames
|
|
//that behave like P frames
|
|
avctx->has_b_frames = !(s->low_delay);
|
|
|
|
if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
|
|
//mpeg1 fps
|
|
avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
|
|
avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
|
|
//mpeg1 aspect
|
|
avctx->sample_aspect_ratio= av_d2q(
|
|
1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
|
|
|
|
}else{//mpeg2
|
|
//mpeg2 fps
|
|
av_reduce(
|
|
&s->avctx->time_base.den,
|
|
&s->avctx->time_base.num,
|
|
ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
|
|
ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
|
|
1<<30);
|
|
//mpeg2 aspect
|
|
if(s->aspect_ratio_info > 1){
|
|
if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
|
|
s->avctx->sample_aspect_ratio=
|
|
av_div_q(
|
|
ff_mpeg2_aspect[s->aspect_ratio_info],
|
|
(AVRational){s->width, s->height}
|
|
);
|
|
}else{
|
|
s->avctx->sample_aspect_ratio=
|
|
av_div_q(
|
|
ff_mpeg2_aspect[s->aspect_ratio_info],
|
|
(AVRational){s1->pan_scan.width, s1->pan_scan.height}
|
|
);
|
|
}
|
|
}else{
|
|
s->avctx->sample_aspect_ratio=
|
|
ff_mpeg2_aspect[s->aspect_ratio_info];
|
|
}
|
|
}//mpeg2
|
|
|
|
if(avctx->xvmc_acceleration){
|
|
avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
|
|
}else{
|
|
if(s->chroma_format < 2){
|
|
avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
|
|
}else
|
|
if(s->chroma_format == 2){
|
|
avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
|
|
}else
|
|
if(s->chroma_format > 2){
|
|
avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
|
|
}
|
|
}
|
|
//until then pix_fmt may be changed right after codec init
|
|
if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
|
|
if( avctx->idct_algo == FF_IDCT_AUTO )
|
|
avctx->idct_algo = FF_IDCT_SIMPLE;
|
|
|
|
//quantization matrixes may need reordering
|
|
//if dct permutation is changed
|
|
memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
|
|
|
|
if (MPV_common_init(s) < 0)
|
|
return -2;
|
|
|
|
quant_matrix_rebuild(s->intra_matrix, old_permutation,s->dsp.idct_permutation);
|
|
quant_matrix_rebuild(s->inter_matrix, old_permutation,s->dsp.idct_permutation);
|
|
quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
|
|
quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
|
|
|
|
s1->mpeg_enc_ctx_allocated = 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int mpeg1_decode_picture(AVCodecContext *avctx,
|
|
const uint8_t *buf, int buf_size)
|
|
{
|
|
Mpeg1Context *s1 = avctx->priv_data;
|
|
MpegEncContext *s = &s1->mpeg_enc_ctx;
|
|
int ref, f_code, vbv_delay;
|
|
|
|
if(mpeg_decode_postinit(s->avctx) < 0)
|
|
return -2;
|
|
|
|
init_get_bits(&s->gb, buf, buf_size*8);
|
|
|
|
ref = get_bits(&s->gb, 10); /* temporal ref */
|
|
s->pict_type = get_bits(&s->gb, 3);
|
|
if(s->pict_type == 0 || s->pict_type > 3)
|
|
return -1;
|
|
|
|
vbv_delay= get_bits(&s->gb, 16);
|
|
if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
|
|
s->full_pel[0] = get_bits1(&s->gb);
|
|
f_code = get_bits(&s->gb, 3);
|
|
if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
|
|
return -1;
|
|
s->mpeg_f_code[0][0] = f_code;
|
|
s->mpeg_f_code[0][1] = f_code;
|
|
}
|
|
if (s->pict_type == B_TYPE) {
|
|
s->full_pel[1] = get_bits1(&s->gb);
|
|
f_code = get_bits(&s->gb, 3);
|
|
if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
|
|
return -1;
|
|
s->mpeg_f_code[1][0] = f_code;
|
|
s->mpeg_f_code[1][1] = f_code;
|
|
}
|
|
s->current_picture.pict_type= s->pict_type;
|
|
s->current_picture.key_frame= s->pict_type == I_TYPE;
|
|
|
|
if(avctx->debug & FF_DEBUG_PICT_INFO)
|
|
av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
|
|
|
|
s->y_dc_scale = 8;
|
|
s->c_dc_scale = 8;
|
|
s->first_slice = 1;
|
|
return 0;
|
|
}
|
|
|
|
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
|
|
{
|
|
MpegEncContext *s= &s1->mpeg_enc_ctx;
|
|
int horiz_size_ext, vert_size_ext;
|
|
int bit_rate_ext;
|
|
|
|
skip_bits(&s->gb, 1); /* profil and level esc*/
|
|
s->avctx->profile= get_bits(&s->gb, 3);
|
|
s->avctx->level= get_bits(&s->gb, 4);
|
|
s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
|
|
s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
|
|
horiz_size_ext = get_bits(&s->gb, 2);
|
|
vert_size_ext = get_bits(&s->gb, 2);
|
|
s->width |= (horiz_size_ext << 12);
|
|
s->height |= (vert_size_ext << 12);
|
|
bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
|
|
s->bit_rate += (bit_rate_ext << 18) * 400;
|
|
skip_bits1(&s->gb); /* marker */
|
|
s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
|
|
|
|
s->low_delay = get_bits1(&s->gb);
|
|
if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
|
|
|
|
s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
|
|
s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
|
|
|
|
dprintf(s->avctx, "sequence extension\n");
|
|
s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
|
|
s->avctx->sub_id = 2; /* indicates mpeg2 found */
|
|
|
|
if(s->avctx->debug & FF_DEBUG_PICT_INFO)
|
|
av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
|
|
s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
|
|
|
|
}
|
|
|
|
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
|
|
{
|
|
MpegEncContext *s= &s1->mpeg_enc_ctx;
|
|
int color_description, w, h;
|
|
|
|
skip_bits(&s->gb, 3); /* video format */
|
|
color_description= get_bits1(&s->gb);
|
|
if(color_description){
|
|
skip_bits(&s->gb, 8); /* color primaries */
|
|
skip_bits(&s->gb, 8); /* transfer_characteristics */
|
|
skip_bits(&s->gb, 8); /* matrix_coefficients */
|
|
}
|
|
w= get_bits(&s->gb, 14);
|
|
skip_bits(&s->gb, 1); //marker
|
|
h= get_bits(&s->gb, 14);
|
|
skip_bits(&s->gb, 1); //marker
|
|
|
|
s1->pan_scan.width= 16*w;
|
|
s1->pan_scan.height=16*h;
|
|
|
|
if(s->avctx->debug & FF_DEBUG_PICT_INFO)
|
|
av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
|
|
}
|
|
|
|
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
|
|
{
|
|
MpegEncContext *s= &s1->mpeg_enc_ctx;
|
|
int i,nofco;
|
|
|
|
nofco = 1;
|
|
if(s->progressive_sequence){
|
|
if(s->repeat_first_field){
|
|
nofco++;
|
|
if(s->top_field_first)
|
|
nofco++;
|
|
}
|
|
}else{
|
|
if(s->picture_structure == PICT_FRAME){
|
|
nofco++;
|
|
if(s->repeat_first_field)
|
|
nofco++;
|
|
}
|
|
}
|
|
for(i=0; i<nofco; i++){
|
|
s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
|
|
skip_bits(&s->gb, 1); //marker
|
|
s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
|
|
skip_bits(&s->gb, 1); //marker
|
|
}
|
|
|
|
if(s->avctx->debug & FF_DEBUG_PICT_INFO)
|
|
av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
|
|
s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
|
|
s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
|
|
s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
|
|
);
|
|
}
|
|
|
|
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
|
|
{
|
|
int i, v, j;
|
|
|
|
dprintf(s->avctx, "matrix extension\n");
|
|
|
|
if (get_bits1(&s->gb)) {
|
|
for(i=0;i<64;i++) {
|
|
v = get_bits(&s->gb, 8);
|
|
j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
|
|
s->intra_matrix[j] = v;
|
|
s->chroma_intra_matrix[j] = v;
|
|
}
|
|
}
|
|
if (get_bits1(&s->gb)) {
|
|
for(i=0;i<64;i++) {
|
|
v = get_bits(&s->gb, 8);
|
|
j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
|
|
s->inter_matrix[j] = v;
|
|
s->chroma_inter_matrix[j] = v;
|
|
}
|
|
}
|
|
if (get_bits1(&s->gb)) {
|
|
for(i=0;i<64;i++) {
|
|
v = get_bits(&s->gb, 8);
|
|
j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
|
|
s->chroma_intra_matrix[j] = v;
|
|
}
|
|
}
|
|
if (get_bits1(&s->gb)) {
|
|
for(i=0;i<64;i++) {
|
|
v = get_bits(&s->gb, 8);
|
|
j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
|
|
s->chroma_inter_matrix[j] = v;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
|
|
{
|
|
s->full_pel[0] = s->full_pel[1] = 0;
|
|
s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
|
|
s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
|
|
s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
|
|
s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
|
|
s->intra_dc_precision = get_bits(&s->gb, 2);
|
|
s->picture_structure = get_bits(&s->gb, 2);
|
|
s->top_field_first = get_bits1(&s->gb);
|
|
s->frame_pred_frame_dct = get_bits1(&s->gb);
|
|
s->concealment_motion_vectors = get_bits1(&s->gb);
|
|
s->q_scale_type = get_bits1(&s->gb);
|
|
s->intra_vlc_format = get_bits1(&s->gb);
|
|
s->alternate_scan = get_bits1(&s->gb);
|
|
s->repeat_first_field = get_bits1(&s->gb);
|
|
s->chroma_420_type = get_bits1(&s->gb);
|
|
s->progressive_frame = get_bits1(&s->gb);
|
|
|
|
if(s->picture_structure == PICT_FRAME){
|
|
s->first_field=0;
|
|
s->v_edge_pos= 16*s->mb_height;
|
|
}else{
|
|
s->first_field ^= 1;
|
|
s->v_edge_pos= 8*s->mb_height;
|
|
memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
|
|
}
|
|
|
|
if(s->alternate_scan){
|
|
ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
|
|
ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
|
|
}else{
|
|
ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
|
|
ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
|
|
}
|
|
|
|
/* composite display not parsed */
|
|
dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
|
|
dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
|
|
dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
|
|
dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
|
|
dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
|
|
dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
|
|
dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
|
|
dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
|
|
dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
|
|
}
|
|
|
|
static void mpeg_decode_extension(AVCodecContext *avctx,
|
|
const uint8_t *buf, int buf_size)
|
|
{
|
|
Mpeg1Context *s1 = avctx->priv_data;
|
|
MpegEncContext *s = &s1->mpeg_enc_ctx;
|
|
int ext_type;
|
|
|
|
init_get_bits(&s->gb, buf, buf_size*8);
|
|
|
|
ext_type = get_bits(&s->gb, 4);
|
|
switch(ext_type) {
|
|
case 0x1:
|
|
mpeg_decode_sequence_extension(s1);
|
|
break;
|
|
case 0x2:
|
|
mpeg_decode_sequence_display_extension(s1);
|
|
break;
|
|
case 0x3:
|
|
mpeg_decode_quant_matrix_extension(s);
|
|
break;
|
|
case 0x7:
|
|
mpeg_decode_picture_display_extension(s1);
|
|
break;
|
|
case 0x8:
|
|
mpeg_decode_picture_coding_extension(s);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void exchange_uv(MpegEncContext *s){
|
|
short * tmp = s->pblocks[4];
|
|
s->pblocks[4] = s->pblocks[5];
|
|
s->pblocks[5] = tmp;
|
|
}
|
|
|
|
static int mpeg_field_start(MpegEncContext *s){
|
|
AVCodecContext *avctx= s->avctx;
|
|
Mpeg1Context *s1 = (Mpeg1Context*)s;
|
|
|
|
/* start frame decoding */
|
|
if(s->first_field || s->picture_structure==PICT_FRAME){
|
|
if(MPV_frame_start(s, avctx) < 0)
|
|
return -1;
|
|
|
|
ff_er_frame_start(s);
|
|
|
|
/* first check if we must repeat the frame */
|
|
s->current_picture_ptr->repeat_pict = 0;
|
|
if (s->repeat_first_field) {
|
|
if (s->progressive_sequence) {
|
|
if (s->top_field_first)
|
|
s->current_picture_ptr->repeat_pict = 4;
|
|
else
|
|
s->current_picture_ptr->repeat_pict = 2;
|
|
} else if (s->progressive_frame) {
|
|
s->current_picture_ptr->repeat_pict = 1;
|
|
}
|
|
}
|
|
|
|
*s->current_picture_ptr->pan_scan= s1->pan_scan;
|
|
}else{ //second field
|
|
int i;
|
|
|
|
if(!s->current_picture_ptr){
|
|
av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
|
|
return -1;
|
|
}
|
|
|
|
for(i=0; i<4; i++){
|
|
s->current_picture.data[i] = s->current_picture_ptr->data[i];
|
|
if(s->picture_structure == PICT_BOTTOM_FIELD){
|
|
s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
|
|
}
|
|
}
|
|
}
|
|
#ifdef HAVE_XVMC
|
|
// MPV_frame_start will call this function too,
|
|
// but we need to call it on every field
|
|
if(s->avctx->xvmc_acceleration)
|
|
XVMC_field_start(s,avctx);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define DECODE_SLICE_ERROR -1
|
|
#define DECODE_SLICE_OK 0
|
|
|
|
/**
|
|
* decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
|
|
* @return DECODE_SLICE_ERROR if the slice is damaged<br>
|
|
* DECODE_SLICE_OK if this slice is ok<br>
|
|
*/
|
|
static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
|
|
const uint8_t **buf, int buf_size)
|
|
{
|
|
MpegEncContext *s = &s1->mpeg_enc_ctx;
|
|
AVCodecContext *avctx= s->avctx;
|
|
const int field_pic= s->picture_structure != PICT_FRAME;
|
|
const int lowres= s->avctx->lowres;
|
|
|
|
s->resync_mb_x=
|
|
s->resync_mb_y= -1;
|
|
|
|
if (mb_y<<field_pic >= s->mb_height){
|
|
av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
|
|
return -1;
|
|
}
|
|
|
|
init_get_bits(&s->gb, *buf, buf_size*8);
|
|
|
|
ff_mpeg1_clean_buffers(s);
|
|
s->interlaced_dct = 0;
|
|
|
|
s->qscale = get_qscale(s);
|
|
|
|
if(s->qscale == 0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
|
|
return -1;
|
|
}
|
|
|
|
/* extra slice info */
|
|
while (get_bits1(&s->gb) != 0) {
|
|
skip_bits(&s->gb, 8);
|
|
}
|
|
|
|
s->mb_x=0;
|
|
|
|
for(;;) {
|
|
int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
|
|
if (code < 0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
|
|
return -1;
|
|
}
|
|
if (code >= 33) {
|
|
if (code == 33) {
|
|
s->mb_x += 33;
|
|
}
|
|
/* otherwise, stuffing, nothing to do */
|
|
} else {
|
|
s->mb_x += code;
|
|
break;
|
|
}
|
|
}
|
|
if(s->mb_x >= (unsigned)s->mb_width){
|
|
av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
|
|
return -1;
|
|
}
|
|
|
|
s->resync_mb_x= s->mb_x;
|
|
s->resync_mb_y= s->mb_y= mb_y;
|
|
s->mb_skip_run= 0;
|
|
ff_init_block_index(s);
|
|
|
|
if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
|
|
if(s->avctx->debug&FF_DEBUG_PICT_INFO){
|
|
av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%2d%2d%2d%2d %s %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n",
|
|
s->qscale, s->mpeg_f_code[0][0],s->mpeg_f_code[0][1],s->mpeg_f_code[1][0],s->mpeg_f_code[1][1],
|
|
s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
|
|
s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
|
|
s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
|
|
s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
|
|
}
|
|
}
|
|
|
|
for(;;) {
|
|
#ifdef HAVE_XVMC
|
|
//one 1 we memcpy blocks in xvmcvideo
|
|
if(s->avctx->xvmc_acceleration > 1)
|
|
XVMC_init_block(s);//set s->block
|
|
#endif
|
|
|
|
if(mpeg_decode_mb(s, s->block) < 0)
|
|
return -1;
|
|
|
|
if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
|
|
const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
|
|
int xy = s->mb_x*2 + s->mb_y*2*wrap;
|
|
int motion_x, motion_y, dir, i;
|
|
if(field_pic && !s->first_field)
|
|
xy += wrap/2;
|
|
|
|
for(i=0; i<2; i++){
|
|
for(dir=0; dir<2; dir++){
|
|
if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
|
|
motion_x = motion_y = 0;
|
|
}else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
|
|
motion_x = s->mv[dir][0][0];
|
|
motion_y = s->mv[dir][0][1];
|
|
} else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
|
|
motion_x = s->mv[dir][i][0];
|
|
motion_y = s->mv[dir][i][1];
|
|
}
|
|
|
|
s->current_picture.motion_val[dir][xy ][0] = motion_x;
|
|
s->current_picture.motion_val[dir][xy ][1] = motion_y;
|
|
s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
|
|
s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
|
|
s->current_picture.ref_index [dir][xy ]=
|
|
s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
|
|
assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
|
|
}
|
|
xy += wrap;
|
|
}
|
|
}
|
|
|
|
s->dest[0] += 16 >> lowres;
|
|
s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
|
|
s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
|
|
|
|
MPV_decode_mb(s, s->block);
|
|
|
|
if (++s->mb_x >= s->mb_width) {
|
|
const int mb_size= 16>>s->avctx->lowres;
|
|
|
|
ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
|
|
|
|
s->mb_x = 0;
|
|
s->mb_y++;
|
|
|
|
if(s->mb_y<<field_pic >= s->mb_height){
|
|
int left= s->gb.size_in_bits - get_bits_count(&s->gb);
|
|
int is_d10= s->chroma_format==2 && s->pict_type==I_TYPE && avctx->profile==0 && avctx->level==5
|
|
&& s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
|
|
&& s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
|
|
|
|
if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
|
|
|| (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
|
|
av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
|
|
return -1;
|
|
}else
|
|
goto eos;
|
|
}
|
|
|
|
ff_init_block_index(s);
|
|
}
|
|
|
|
/* skip mb handling */
|
|
if (s->mb_skip_run == -1) {
|
|
/* read again increment */
|
|
s->mb_skip_run = 0;
|
|
for(;;) {
|
|
int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
|
|
if (code < 0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
|
|
return -1;
|
|
}
|
|
if (code >= 33) {
|
|
if (code == 33) {
|
|
s->mb_skip_run += 33;
|
|
}else if(code == 35){
|
|
if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
|
|
return -1;
|
|
}
|
|
goto eos; /* end of slice */
|
|
}
|
|
/* otherwise, stuffing, nothing to do */
|
|
} else {
|
|
s->mb_skip_run += code;
|
|
break;
|
|
}
|
|
}
|
|
if(s->mb_skip_run){
|
|
int i;
|
|
if(s->pict_type == I_TYPE){
|
|
av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
|
|
/* skip mb */
|
|
s->mb_intra = 0;
|
|
for(i=0;i<12;i++)
|
|
s->block_last_index[i] = -1;
|
|
if(s->picture_structure == PICT_FRAME)
|
|
s->mv_type = MV_TYPE_16X16;
|
|
else
|
|
s->mv_type = MV_TYPE_FIELD;
|
|
if (s->pict_type == P_TYPE) {
|
|
/* if P type, zero motion vector is implied */
|
|
s->mv_dir = MV_DIR_FORWARD;
|
|
s->mv[0][0][0] = s->mv[0][0][1] = 0;
|
|
s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
|
|
s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
|
|
s->field_select[0][0]= s->picture_structure - 1;
|
|
} else {
|
|
/* if B type, reuse previous vectors and directions */
|
|
s->mv[0][0][0] = s->last_mv[0][0][0];
|
|
s->mv[0][0][1] = s->last_mv[0][0][1];
|
|
s->mv[1][0][0] = s->last_mv[1][0][0];
|
|
s->mv[1][0][1] = s->last_mv[1][0][1];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
eos: // end of slice
|
|
*buf += (get_bits_count(&s->gb)-1)/8;
|
|
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
|
|
return 0;
|
|
}
|
|
|
|
static int slice_decode_thread(AVCodecContext *c, void *arg){
|
|
MpegEncContext *s= arg;
|
|
const uint8_t *buf= s->gb.buffer;
|
|
int mb_y= s->start_mb_y;
|
|
|
|
s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
|
|
|
|
for(;;){
|
|
uint32_t start_code;
|
|
int ret;
|
|
|
|
ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
|
|
emms_c();
|
|
//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
|
|
//ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, s->start_mb_y, s->end_mb_y, s->error_count);
|
|
if(ret < 0){
|
|
if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
|
|
ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
|
|
}else{
|
|
ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
|
|
}
|
|
|
|
if(s->mb_y == s->end_mb_y)
|
|
return 0;
|
|
|
|
start_code= -1;
|
|
buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
|
|
mb_y= start_code - SLICE_MIN_START_CODE;
|
|
if(mb_y < 0 || mb_y >= s->end_mb_y)
|
|
return -1;
|
|
}
|
|
|
|
return 0; //not reached
|
|
}
|
|
|
|
/**
|
|
* handles slice ends.
|
|
* @return 1 if it seems to be the last slice of
|
|
*/
|
|
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
|
|
{
|
|
Mpeg1Context *s1 = avctx->priv_data;
|
|
MpegEncContext *s = &s1->mpeg_enc_ctx;
|
|
|
|
if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
|
|
return 0;
|
|
|
|
#ifdef HAVE_XVMC
|
|
if(s->avctx->xvmc_acceleration)
|
|
XVMC_field_end(s);
|
|
#endif
|
|
/* end of slice reached */
|
|
if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
|
|
/* end of image */
|
|
|
|
s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
|
|
|
|
ff_er_frame_end(s);
|
|
|
|
MPV_frame_end(s);
|
|
|
|
if (s->pict_type == B_TYPE || s->low_delay) {
|
|
*pict= *(AVFrame*)s->current_picture_ptr;
|
|
ff_print_debug_info(s, pict);
|
|
} else {
|
|
s->picture_number++;
|
|
/* latency of 1 frame for I and P frames */
|
|
/* XXX: use another variable than picture_number */
|
|
if (s->last_picture_ptr != NULL) {
|
|
*pict= *(AVFrame*)s->last_picture_ptr;
|
|
ff_print_debug_info(s, pict);
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static int mpeg1_decode_sequence(AVCodecContext *avctx,
|
|
const uint8_t *buf, int buf_size)
|
|
{
|
|
Mpeg1Context *s1 = avctx->priv_data;
|
|
MpegEncContext *s = &s1->mpeg_enc_ctx;
|
|
int width,height;
|
|
int i, v, j;
|
|
|
|
init_get_bits(&s->gb, buf, buf_size*8);
|
|
|
|
width = get_bits(&s->gb, 12);
|
|
height = get_bits(&s->gb, 12);
|
|
if (width <= 0 || height <= 0 ||
|
|
(width % 2) != 0 || (height % 2) != 0)
|
|
return -1;
|
|
s->aspect_ratio_info= get_bits(&s->gb, 4);
|
|
if (s->aspect_ratio_info == 0)
|
|
return -1;
|
|
s->frame_rate_index = get_bits(&s->gb, 4);
|
|
if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
|
|
return -1;
|
|
s->bit_rate = get_bits(&s->gb, 18) * 400;
|
|
if (get_bits1(&s->gb) == 0) /* marker */
|
|
return -1;
|
|
s->width = width;
|
|
s->height = height;
|
|
|
|
s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
|
|
skip_bits(&s->gb, 1);
|
|
|
|
/* get matrix */
|
|
if (get_bits1(&s->gb)) {
|
|
for(i=0;i<64;i++) {
|
|
v = get_bits(&s->gb, 8);
|
|
if(v==0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
|
|
return -1;
|
|
}
|
|
j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
|
|
s->intra_matrix[j] = v;
|
|
s->chroma_intra_matrix[j] = v;
|
|
}
|
|
#ifdef DEBUG
|
|
dprintf(s->avctx, "intra matrix present\n");
|
|
for(i=0;i<64;i++)
|
|
dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
|
|
dprintf(s->avctx, "\n");
|
|
#endif
|
|
} else {
|
|
for(i=0;i<64;i++) {
|
|
j = s->dsp.idct_permutation[i];
|
|
v = ff_mpeg1_default_intra_matrix[i];
|
|
s->intra_matrix[j] = v;
|
|
s->chroma_intra_matrix[j] = v;
|
|
}
|
|
}
|
|
if (get_bits1(&s->gb)) {
|
|
for(i=0;i<64;i++) {
|
|
v = get_bits(&s->gb, 8);
|
|
if(v==0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
|
|
return -1;
|
|
}
|
|
j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
|
|
s->inter_matrix[j] = v;
|
|
s->chroma_inter_matrix[j] = v;
|
|
}
|
|
#ifdef DEBUG
|
|
dprintf(s->avctx, "non intra matrix present\n");
|
|
for(i=0;i<64;i++)
|
|
dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
|
|
dprintf(s->avctx, "\n");
|
|
#endif
|
|
} else {
|
|
for(i=0;i<64;i++) {
|
|
int j= s->dsp.idct_permutation[i];
|
|
v = ff_mpeg1_default_non_intra_matrix[i];
|
|
s->inter_matrix[j] = v;
|
|
s->chroma_inter_matrix[j] = v;
|
|
}
|
|
}
|
|
|
|
if(show_bits(&s->gb, 23) != 0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
|
|
return -1;
|
|
}
|
|
|
|
/* we set mpeg2 parameters so that it emulates mpeg1 */
|
|
s->progressive_sequence = 1;
|
|
s->progressive_frame = 1;
|
|
s->picture_structure = PICT_FRAME;
|
|
s->frame_pred_frame_dct = 1;
|
|
s->chroma_format = 1;
|
|
s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
|
|
avctx->sub_id = 1; /* indicates mpeg1 */
|
|
s->out_format = FMT_MPEG1;
|
|
s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
|
|
if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
|
|
|
|
if(s->avctx->debug & FF_DEBUG_PICT_INFO)
|
|
av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
|
|
s->avctx->rc_buffer_size, s->bit_rate);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vcr2_init_sequence(AVCodecContext *avctx)
|
|
{
|
|
Mpeg1Context *s1 = avctx->priv_data;
|
|
MpegEncContext *s = &s1->mpeg_enc_ctx;
|
|
int i, v;
|
|
|
|
/* start new mpeg1 context decoding */
|
|
s->out_format = FMT_MPEG1;
|
|
if (s1->mpeg_enc_ctx_allocated) {
|
|
MPV_common_end(s);
|
|
}
|
|
s->width = avctx->coded_width;
|
|
s->height = avctx->coded_height;
|
|
avctx->has_b_frames= 0; //true?
|
|
s->low_delay= 1;
|
|
|
|
if(avctx->xvmc_acceleration){
|
|
avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
|
|
}else{
|
|
avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
|
|
}
|
|
|
|
if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
|
|
if( avctx->idct_algo == FF_IDCT_AUTO )
|
|
avctx->idct_algo = FF_IDCT_SIMPLE;
|
|
|
|
if (MPV_common_init(s) < 0)
|
|
return -1;
|
|
exchange_uv(s);//common init reset pblocks, so we swap them here
|
|
s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
|
|
s1->mpeg_enc_ctx_allocated = 1;
|
|
|
|
for(i=0;i<64;i++) {
|
|
int j= s->dsp.idct_permutation[i];
|
|
v = ff_mpeg1_default_intra_matrix[i];
|
|
s->intra_matrix[j] = v;
|
|
s->chroma_intra_matrix[j] = v;
|
|
|
|
v = ff_mpeg1_default_non_intra_matrix[i];
|
|
s->inter_matrix[j] = v;
|
|
s->chroma_inter_matrix[j] = v;
|
|
}
|
|
|
|
s->progressive_sequence = 1;
|
|
s->progressive_frame = 1;
|
|
s->picture_structure = PICT_FRAME;
|
|
s->frame_pred_frame_dct = 1;
|
|
s->chroma_format = 1;
|
|
s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
|
|
avctx->sub_id = 2; /* indicates mpeg2 */
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void mpeg_decode_user_data(AVCodecContext *avctx,
|
|
const uint8_t *buf, int buf_size)
|
|
{
|
|
const uint8_t *p;
|
|
int len, flags;
|
|
p = buf;
|
|
len = buf_size;
|
|
|
|
/* we parse the DTG active format information */
|
|
if (len >= 5 &&
|
|
p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
|
|
flags = p[4];
|
|
p += 5;
|
|
len -= 5;
|
|
if (flags & 0x80) {
|
|
/* skip event id */
|
|
if (len < 2)
|
|
return;
|
|
p += 2;
|
|
len -= 2;
|
|
}
|
|
if (flags & 0x40) {
|
|
if (len < 1)
|
|
return;
|
|
avctx->dtg_active_format = p[0] & 0x0f;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void mpeg_decode_gop(AVCodecContext *avctx,
|
|
const uint8_t *buf, int buf_size){
|
|
Mpeg1Context *s1 = avctx->priv_data;
|
|
MpegEncContext *s = &s1->mpeg_enc_ctx;
|
|
|
|
int drop_frame_flag;
|
|
int time_code_hours, time_code_minutes;
|
|
int time_code_seconds, time_code_pictures;
|
|
int broken_link;
|
|
|
|
init_get_bits(&s->gb, buf, buf_size*8);
|
|
|
|
drop_frame_flag = get_bits1(&s->gb);
|
|
|
|
time_code_hours=get_bits(&s->gb,5);
|
|
time_code_minutes = get_bits(&s->gb,6);
|
|
skip_bits1(&s->gb);//marker bit
|
|
time_code_seconds = get_bits(&s->gb,6);
|
|
time_code_pictures = get_bits(&s->gb,6);
|
|
|
|
/*broken_link indicate that after editing the
|
|
reference frames of the first B-Frames after GOP I-Frame
|
|
are missing (open gop)*/
|
|
broken_link = get_bits1(&s->gb);
|
|
|
|
if(s->avctx->debug & FF_DEBUG_PICT_INFO)
|
|
av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
|
|
time_code_hours, time_code_minutes, time_code_seconds,
|
|
time_code_pictures, broken_link);
|
|
}
|
|
/**
|
|
* finds the end of the current frame in the bitstream.
|
|
* @return the position of the first byte of the next frame, or -1
|
|
*/
|
|
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
|
|
{
|
|
int i;
|
|
uint32_t state= pc->state;
|
|
|
|
/* EOF considered as end of frame */
|
|
if (buf_size == 0)
|
|
return 0;
|
|
|
|
/*
|
|
0 frame start -> 1/4
|
|
1 first_SEQEXT -> 0/2
|
|
2 first field start -> 3/0
|
|
3 second_SEQEXT -> 2/0
|
|
4 searching end
|
|
*/
|
|
|
|
for(i=0; i<buf_size; i++){
|
|
assert(pc->frame_start_found>=0 && pc->frame_start_found<=4);
|
|
if(pc->frame_start_found&1){
|
|
if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80)
|
|
pc->frame_start_found--;
|
|
else if(state == EXT_START_CODE+2){
|
|
if((buf[i]&3) == 3) pc->frame_start_found= 0;
|
|
else pc->frame_start_found= (pc->frame_start_found+1)&3;
|
|
}
|
|
state++;
|
|
}else{
|
|
i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
|
|
if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
|
|
i++;
|
|
pc->frame_start_found=4;
|
|
}
|
|
if(state == SEQ_END_CODE){
|
|
pc->state=-1;
|
|
return i+1;
|
|
}
|
|
if(pc->frame_start_found==2 && state == SEQ_START_CODE)
|
|
pc->frame_start_found= 0;
|
|
if(pc->frame_start_found<4 && state == EXT_START_CODE)
|
|
pc->frame_start_found++;
|
|
if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){
|
|
if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
|
|
pc->frame_start_found=0;
|
|
pc->state=-1;
|
|
return i-3;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
pc->state= state;
|
|
return END_NOT_FOUND;
|
|
}
|
|
|
|
/* handle buffering and image synchronisation */
|
|
static int mpeg_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
const uint8_t *buf, int buf_size)
|
|
{
|
|
Mpeg1Context *s = avctx->priv_data;
|
|
const uint8_t *buf_end;
|
|
const uint8_t *buf_ptr;
|
|
uint32_t start_code;
|
|
int ret, input_size;
|
|
AVFrame *picture = data;
|
|
MpegEncContext *s2 = &s->mpeg_enc_ctx;
|
|
dprintf(avctx, "fill_buffer\n");
|
|
|
|
if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
|
|
/* special case for last picture */
|
|
if (s2->low_delay==0 && s2->next_picture_ptr) {
|
|
*picture= *(AVFrame*)s2->next_picture_ptr;
|
|
s2->next_picture_ptr= NULL;
|
|
|
|
*data_size = sizeof(AVFrame);
|
|
}
|
|
return buf_size;
|
|
}
|
|
|
|
if(s2->flags&CODEC_FLAG_TRUNCATED){
|
|
int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
|
|
|
|
if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
|
|
return buf_size;
|
|
}
|
|
|
|
buf_ptr = buf;
|
|
buf_end = buf + buf_size;
|
|
|
|
#if 0
|
|
if (s->repeat_field % 2 == 1) {
|
|
s->repeat_field++;
|
|
//fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
|
|
// s2->picture_number, s->repeat_field);
|
|
if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
|
|
*data_size = sizeof(AVPicture);
|
|
goto the_end;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
|
|
vcr2_init_sequence(avctx);
|
|
|
|
s->slice_count= 0;
|
|
|
|
for(;;) {
|
|
/* find start next code */
|
|
start_code = -1;
|
|
buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
|
|
if (start_code > 0x1ff){
|
|
if(s2->pict_type != B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
|
|
if(avctx->thread_count > 1){
|
|
int i;
|
|
|
|
avctx->execute(avctx, slice_decode_thread, (void**)&(s2->thread_context[0]), NULL, s->slice_count);
|
|
for(i=0; i<s->slice_count; i++)
|
|
s2->error_count += s2->thread_context[i]->error_count;
|
|
}
|
|
if (slice_end(avctx, picture)) {
|
|
if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
|
|
*data_size = sizeof(AVPicture);
|
|
}
|
|
}
|
|
return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
|
|
}
|
|
|
|
input_size = buf_end - buf_ptr;
|
|
|
|
if(avctx->debug & FF_DEBUG_STARTCODE){
|
|
av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
|
|
}
|
|
|
|
/* prepare data for next start code */
|
|
switch(start_code) {
|
|
case SEQ_START_CODE:
|
|
mpeg1_decode_sequence(avctx, buf_ptr,
|
|
input_size);
|
|
break;
|
|
|
|
case PICTURE_START_CODE:
|
|
/* we have a complete image : we try to decompress it */
|
|
mpeg1_decode_picture(avctx,
|
|
buf_ptr, input_size);
|
|
break;
|
|
case EXT_START_CODE:
|
|
mpeg_decode_extension(avctx,
|
|
buf_ptr, input_size);
|
|
break;
|
|
case USER_START_CODE:
|
|
mpeg_decode_user_data(avctx,
|
|
buf_ptr, input_size);
|
|
break;
|
|
case GOP_START_CODE:
|
|
s2->first_field=0;
|
|
mpeg_decode_gop(avctx,
|
|
buf_ptr, input_size);
|
|
break;
|
|
default:
|
|
if (start_code >= SLICE_MIN_START_CODE &&
|
|
start_code <= SLICE_MAX_START_CODE) {
|
|
int mb_y= start_code - SLICE_MIN_START_CODE;
|
|
|
|
if(s2->last_picture_ptr==NULL){
|
|
/* Skip B-frames if we do not have reference frames. */
|
|
if(s2->pict_type==B_TYPE) break;
|
|
}
|
|
if(s2->next_picture_ptr==NULL){
|
|
/* Skip P-frames if we do not have reference frame no valid header. */
|
|
if(s2->pict_type==P_TYPE && (s2->first_field || s2->picture_structure==PICT_FRAME)) break;
|
|
}
|
|
/* Skip B-frames if we are in a hurry. */
|
|
if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
|
|
if( (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==B_TYPE)
|
|
||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=I_TYPE)
|
|
|| avctx->skip_frame >= AVDISCARD_ALL)
|
|
break;
|
|
/* Skip everything if we are in a hurry>=5. */
|
|
if(avctx->hurry_up>=5) break;
|
|
|
|
if (!s->mpeg_enc_ctx_allocated) break;
|
|
|
|
if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
|
|
if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
|
|
break;
|
|
}
|
|
|
|
if(s2->first_slice){
|
|
s2->first_slice=0;
|
|
if(mpeg_field_start(s2) < 0)
|
|
return -1;
|
|
}
|
|
if(!s2->current_picture_ptr){
|
|
av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
|
|
return -1;
|
|
}
|
|
|
|
if(avctx->thread_count > 1){
|
|
int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
|
|
if(threshold <= mb_y){
|
|
MpegEncContext *thread_context= s2->thread_context[s->slice_count];
|
|
|
|
thread_context->start_mb_y= mb_y;
|
|
thread_context->end_mb_y = s2->mb_height;
|
|
if(s->slice_count){
|
|
s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
|
|
ff_update_duplicate_context(thread_context, s2);
|
|
}
|
|
init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
|
|
s->slice_count++;
|
|
}
|
|
buf_ptr += 2; //FIXME add minimum num of bytes per slice
|
|
}else{
|
|
ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
|
|
emms_c();
|
|
|
|
if(ret < 0){
|
|
if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
|
|
ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
|
|
}else{
|
|
ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x-1, s2->mb_y, AC_END|DC_END|MV_END);
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int mpeg_decode_end(AVCodecContext *avctx)
|
|
{
|
|
Mpeg1Context *s = avctx->priv_data;
|
|
|
|
if (s->mpeg_enc_ctx_allocated)
|
|
MPV_common_end(&s->mpeg_enc_ctx);
|
|
return 0;
|
|
}
|
|
|
|
AVCodec mpeg1video_decoder = {
|
|
"mpeg1video",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_MPEG1VIDEO,
|
|
sizeof(Mpeg1Context),
|
|
mpeg_decode_init,
|
|
NULL,
|
|
mpeg_decode_end,
|
|
mpeg_decode_frame,
|
|
CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
|
|
.flush= ff_mpeg_flush,
|
|
};
|
|
|
|
AVCodec mpeg2video_decoder = {
|
|
"mpeg2video",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_MPEG2VIDEO,
|
|
sizeof(Mpeg1Context),
|
|
mpeg_decode_init,
|
|
NULL,
|
|
mpeg_decode_end,
|
|
mpeg_decode_frame,
|
|
CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
|
|
.flush= ff_mpeg_flush,
|
|
};
|
|
|
|
//legacy decoder
|
|
AVCodec mpegvideo_decoder = {
|
|
"mpegvideo",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_MPEG2VIDEO,
|
|
sizeof(Mpeg1Context),
|
|
mpeg_decode_init,
|
|
NULL,
|
|
mpeg_decode_end,
|
|
mpeg_decode_frame,
|
|
CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
|
|
.flush= ff_mpeg_flush,
|
|
};
|
|
|
|
#ifdef HAVE_XVMC
|
|
static int mpeg_mc_decode_init(AVCodecContext *avctx){
|
|
Mpeg1Context *s;
|
|
|
|
if( avctx->thread_count > 1)
|
|
return -1;
|
|
if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
|
|
return -1;
|
|
if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
|
|
dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
|
|
}
|
|
mpeg_decode_init(avctx);
|
|
s = avctx->priv_data;
|
|
|
|
avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
|
|
avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec mpeg_xvmc_decoder = {
|
|
"mpegvideo_xvmc",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_MPEG2VIDEO_XVMC,
|
|
sizeof(Mpeg1Context),
|
|
mpeg_mc_decode_init,
|
|
NULL,
|
|
mpeg_decode_end,
|
|
mpeg_decode_frame,
|
|
CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
|
|
.flush= ff_mpeg_flush,
|
|
};
|
|
|
|
#endif
|
|
|
|
/* this is ugly i know, but the alternative is too make
|
|
hundreds of vars global and prefix them with ff_mpeg1_
|
|
which is far uglier. */
|
|
#include "mdec.c"
|