f7696989d9
Originally committed as revision 1342 to svn://svn.ffmpeg.org/ffmpeg/trunk
2007 lines
65 KiB
C
2007 lines
65 KiB
C
/*
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* MPEG1 encoder / MPEG2 decoder
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* Copyright (c) 2000,2001 Fabrice Bellard.
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*
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* This library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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 "mpeg12data.h"
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#if 1
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#define PRINT_QP(a, b) {}
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#else
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#define PRINT_QP(a, b) printf(a, b)
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#endif
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/* Start codes. */
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#define SEQ_END_CODE 0x000001b7
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#define SEQ_START_CODE 0x000001b3
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#define GOP_START_CODE 0x000001b8
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#define PICTURE_START_CODE 0x00000100
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#define SLICE_MIN_START_CODE 0x00000101
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#define SLICE_MAX_START_CODE 0x000001af
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#define EXT_START_CODE 0x000001b5
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#define USER_START_CODE 0x000001b2
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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 void mpeg1_encode_block(MpegEncContext *s,
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DCTELEM *block,
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int component);
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static void mpeg1_encode_motion(MpegEncContext *s, int val);
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static void mpeg1_skip_picture(MpegEncContext *s, int pict_num);
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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 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 int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
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static UINT16 mv_penalty[MAX_FCODE+1][MAX_MV*2+1];
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static UINT8 fcode_tab[MAX_MV*2+1];
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static inline int get_bits_diff(MpegEncContext *s){
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int bits,ret;
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bits= get_bit_count(&s->pb);
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ret= bits - s->last_bits;
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s->last_bits=bits;
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return ret;
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}
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static void init_2d_vlc_rl(RLTable *rl)
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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);
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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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static void put_header(MpegEncContext *s, int header)
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{
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align_put_bits(&s->pb);
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put_bits(&s->pb, 16, header>>16);
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put_bits(&s->pb, 16, header&0xFFFF);
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}
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/* put sequence header if needed */
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static void mpeg1_encode_sequence_header(MpegEncContext *s)
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{
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unsigned int vbv_buffer_size;
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unsigned int fps, v;
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int n, i;
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UINT64 time_code;
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float best_aspect_error= 1E10;
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float aspect_ratio= s->avctx->aspect_ratio;
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if(aspect_ratio==0.0) aspect_ratio= s->width / (float)s->height; //pixel aspect 1:1 (VGA)
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if (s->current_picture.key_frame) {
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/* mpeg1 header repeated every gop */
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put_header(s, SEQ_START_CODE);
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/* search closest frame rate */
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{
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int i, dmin, d;
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s->frame_rate_index = 0;
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dmin = 0x7fffffff;
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for(i=1;i<9;i++) {
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d = abs(s->frame_rate - frame_rate_tab[i]);
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if (d < dmin) {
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dmin = d;
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s->frame_rate_index = i;
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}
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}
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}
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put_bits(&s->pb, 12, s->width);
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put_bits(&s->pb, 12, s->height);
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for(i=1; i<15; i++){
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float error= mpeg1_aspect[i] - s->width/(s->height*aspect_ratio);
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error= ABS(error);
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if(error < best_aspect_error){
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best_aspect_error= error;
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s->aspect_ratio_info= i;
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}
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}
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put_bits(&s->pb, 4, s->aspect_ratio_info);
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put_bits(&s->pb, 4, s->frame_rate_index);
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v = s->bit_rate / 400;
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if (v > 0x3ffff)
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v = 0x3ffff;
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put_bits(&s->pb, 18, v);
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put_bits(&s->pb, 1, 1); /* marker */
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if(s->avctx->rc_buffer_size)
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vbv_buffer_size = s->avctx->rc_buffer_size;
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else
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/* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
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vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
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put_bits(&s->pb, 10, (vbv_buffer_size + 16383) / 16384);
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put_bits(&s->pb, 1, 1); /* constrained parameter flag */
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put_bits(&s->pb, 1, 0); /* no custom intra matrix */
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put_bits(&s->pb, 1, 0); /* no custom non intra matrix */
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put_header(s, GOP_START_CODE);
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put_bits(&s->pb, 1, 0); /* do drop frame */
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/* time code : we must convert from the real frame rate to a
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fake mpeg frame rate in case of low frame rate */
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fps = frame_rate_tab[s->frame_rate_index];
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time_code = (INT64)s->fake_picture_number * FRAME_RATE_BASE;
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s->gop_picture_number = s->fake_picture_number;
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put_bits(&s->pb, 5, (UINT32)((time_code / (fps * 3600)) % 24));
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put_bits(&s->pb, 6, (UINT32)((time_code / (fps * 60)) % 60));
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put_bits(&s->pb, 1, 1);
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put_bits(&s->pb, 6, (UINT32)((time_code / fps) % 60));
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put_bits(&s->pb, 6, (UINT32)((time_code % fps) / FRAME_RATE_BASE));
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put_bits(&s->pb, 1, 1); /* closed gop */
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put_bits(&s->pb, 1, 0); /* broken link */
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}
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if (s->frame_rate < (24 * FRAME_RATE_BASE) && s->picture_number > 0) {
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/* insert empty P pictures to slow down to the desired
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frame rate. Each fake pictures takes about 20 bytes */
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fps = frame_rate_tab[s->frame_rate_index];
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n = (((INT64)s->picture_number * fps) / s->frame_rate) - 1;
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while (s->fake_picture_number < n) {
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mpeg1_skip_picture(s, s->fake_picture_number -
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s->gop_picture_number);
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s->fake_picture_number++;
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}
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}
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}
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/* insert a fake P picture */
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static void mpeg1_skip_picture(MpegEncContext *s, int pict_num)
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{
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unsigned int mb_incr;
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/* mpeg1 picture header */
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put_header(s, PICTURE_START_CODE);
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/* temporal reference */
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put_bits(&s->pb, 10, pict_num & 0x3ff);
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put_bits(&s->pb, 3, P_TYPE);
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put_bits(&s->pb, 16, 0xffff); /* non constant bit rate */
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put_bits(&s->pb, 1, 1); /* integer coordinates */
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put_bits(&s->pb, 3, 1); /* forward_f_code */
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put_bits(&s->pb, 1, 0); /* extra bit picture */
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/* only one slice */
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put_header(s, SLICE_MIN_START_CODE);
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put_bits(&s->pb, 5, 1); /* quantizer scale */
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put_bits(&s->pb, 1, 0); /* slice extra information */
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mb_incr = 1;
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put_bits(&s->pb, mbAddrIncrTable[mb_incr - 1][1],
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mbAddrIncrTable[mb_incr - 1][0]);
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/* empty macroblock */
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put_bits(&s->pb, 3, 1); /* motion only */
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/* zero motion x & y */
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put_bits(&s->pb, 1, 1);
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put_bits(&s->pb, 1, 1);
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/* output a number of empty slice */
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mb_incr = s->mb_width * s->mb_height - 1;
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while (mb_incr > 33) {
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put_bits(&s->pb, 11, 0x008);
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mb_incr -= 33;
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}
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put_bits(&s->pb, mbAddrIncrTable[mb_incr - 1][1],
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mbAddrIncrTable[mb_incr - 1][0]);
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/* empty macroblock */
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put_bits(&s->pb, 3, 1); /* motion only */
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/* zero motion x & y */
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put_bits(&s->pb, 1, 1);
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put_bits(&s->pb, 1, 1);
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}
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static void 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= ff_mpeg1_dc_scale_table;
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}
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void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
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{
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mpeg1_encode_sequence_header(s);
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/* mpeg1 picture header */
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put_header(s, PICTURE_START_CODE);
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/* temporal reference */
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put_bits(&s->pb, 10, (s->fake_picture_number -
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s->gop_picture_number) & 0x3ff);
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s->fake_picture_number++;
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put_bits(&s->pb, 3, s->pict_type);
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put_bits(&s->pb, 16, 0xffff); /* non constant bit rate */
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if (s->pict_type == P_TYPE) {
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put_bits(&s->pb, 1, 0); /* half pel coordinates */
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put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
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}
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put_bits(&s->pb, 1, 0); /* extra bit picture */
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/* only one slice */
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put_header(s, SLICE_MIN_START_CODE);
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put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
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put_bits(&s->pb, 1, 0); /* slice extra information */
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}
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void mpeg1_encode_mb(MpegEncContext *s,
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DCTELEM block[6][64],
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int motion_x, int motion_y)
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{
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int mb_incr, i, cbp, mb_x, mb_y;
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mb_x = s->mb_x;
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mb_y = s->mb_y;
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/* compute cbp */
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cbp = 0;
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for(i=0;i<6;i++) {
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if (s->block_last_index[i] >= 0)
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cbp |= 1 << (5 - i);
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}
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/* skip macroblock, except if first or last macroblock of a slice */
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if ((cbp | motion_x | motion_y) == 0 &&
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(!((mb_x | mb_y) == 0 ||
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(mb_x == s->mb_width - 1 && mb_y == s->mb_height - 1)))) {
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s->mb_incr++;
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s->qscale -= s->dquant;
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s->skip_count++;
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s->misc_bits++;
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s->last_bits++;
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} else {
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/* output mb incr */
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mb_incr = s->mb_incr;
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while (mb_incr > 33) {
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put_bits(&s->pb, 11, 0x008);
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mb_incr -= 33;
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}
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put_bits(&s->pb, mbAddrIncrTable[mb_incr - 1][1],
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mbAddrIncrTable[mb_incr - 1][0]);
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if (s->pict_type == I_TYPE) {
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if(s->dquant && cbp){
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put_bits(&s->pb, 2, 1); /* macroblock_type : macroblock_quant = 1 */
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put_bits(&s->pb, 5, s->qscale);
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}else{
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put_bits(&s->pb, 1, 1); /* macroblock_type : macroblock_quant = 0 */
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s->qscale -= s->dquant;
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}
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s->misc_bits+= get_bits_diff(s);
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s->i_count++;
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} else {
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if (s->mb_intra) {
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if(s->dquant && cbp){
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put_bits(&s->pb, 6, 0x01);
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put_bits(&s->pb, 5, s->qscale);
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}else{
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put_bits(&s->pb, 5, 0x03);
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s->qscale -= s->dquant;
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}
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s->misc_bits+= get_bits_diff(s);
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s->i_count++;
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} else {
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if (cbp != 0) {
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if (motion_x == 0 && motion_y == 0) {
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if(s->dquant){
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put_bits(&s->pb, 5, 1); /* macroblock_pattern & quant */
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put_bits(&s->pb, 5, s->qscale);
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}else{
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put_bits(&s->pb, 2, 1); /* macroblock_pattern only */
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}
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s->misc_bits+= get_bits_diff(s);
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put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
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} else {
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if(s->dquant){
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put_bits(&s->pb, 5, 2); /* motion + cbp */
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put_bits(&s->pb, 5, s->qscale);
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}else{
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put_bits(&s->pb, 1, 1); /* motion + cbp */
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}
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s->misc_bits+= get_bits_diff(s);
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mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0]);
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mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1]);
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s->mv_bits+= get_bits_diff(s);
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put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
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}
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} else {
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put_bits(&s->pb, 3, 1); /* motion only */
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mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0]);
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mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1]);
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s->qscale -= s->dquant;
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s->mv_bits+= get_bits_diff(s);
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}
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s->f_count++;
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}
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}
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for(i=0;i<6;i++) {
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if (cbp & (1 << (5 - i))) {
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mpeg1_encode_block(s, block[i], i);
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}
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}
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s->mb_incr = 1;
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if(s->mb_intra)
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s->i_tex_bits+= get_bits_diff(s);
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else
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s->p_tex_bits+= get_bits_diff(s);
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}
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s->last_mv[0][0][0] = motion_x;
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s->last_mv[0][0][1] = motion_y;
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}
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static void mpeg1_encode_motion(MpegEncContext *s, int val)
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{
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int code, bit_size, l, m, bits, range, sign;
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if (val == 0) {
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/* zero vector */
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code = 0;
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put_bits(&s->pb,
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mbMotionVectorTable[0][1],
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mbMotionVectorTable[0][0]);
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} else {
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bit_size = s->f_code - 1;
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range = 1 << bit_size;
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/* modulo encoding */
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l = 16 * range;
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m = 2 * l;
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if (val < -l) {
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val += m;
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} else if (val >= l) {
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val -= m;
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}
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if (val >= 0) {
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val--;
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code = (val >> bit_size) + 1;
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bits = val & (range - 1);
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sign = 0;
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} else {
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val = -val;
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val--;
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code = (val >> bit_size) + 1;
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bits = val & (range - 1);
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sign = 1;
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}
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put_bits(&s->pb,
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mbMotionVectorTable[code][1],
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mbMotionVectorTable[code][0]);
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put_bits(&s->pb, 1, sign);
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if (bit_size > 0) {
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put_bits(&s->pb, bit_size, bits);
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}
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}
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}
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void ff_mpeg1_encode_init(MpegEncContext *s)
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{
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static int done=0;
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common_init(s);
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if(!done){
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int f_code;
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int mv;
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int i;
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done=1;
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init_rl(&rl_mpeg1);
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for(i=0; i<64; i++)
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{
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mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
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mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
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}
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/* build unified dc encoding tables */
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for(i=-255; i<256; i++)
|
|
{
|
|
int adiff, index;
|
|
int bits, code;
|
|
int diff=i;
|
|
|
|
adiff = ABS(diff);
|
|
if(diff<0) diff--;
|
|
index = vlc_dc_table[adiff];
|
|
|
|
bits= vlc_dc_lum_bits[index] + index;
|
|
code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
|
|
mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
|
|
|
|
bits= vlc_dc_chroma_bits[index] + index;
|
|
code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
|
|
mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
|
|
}
|
|
|
|
for(f_code=1; f_code<=MAX_FCODE; f_code++){
|
|
for(mv=-MAX_MV; mv<=MAX_MV; mv++){
|
|
int len;
|
|
|
|
if(mv==0) len= mbMotionVectorTable[0][1];
|
|
else{
|
|
int val, bit_size, range, code;
|
|
|
|
bit_size = s->f_code - 1;
|
|
range = 1 << bit_size;
|
|
|
|
val=mv;
|
|
if (val < 0)
|
|
val = -val;
|
|
val--;
|
|
code = (val >> bit_size) + 1;
|
|
if(code<17){
|
|
len= mbMotionVectorTable[code][1] + 1 + bit_size;
|
|
}else{
|
|
len= mbMotionVectorTable[16][1] + 2 + bit_size;
|
|
}
|
|
}
|
|
|
|
mv_penalty[f_code][mv+MAX_MV]= len;
|
|
}
|
|
}
|
|
|
|
|
|
for(f_code=MAX_FCODE; f_code>0; f_code--){
|
|
for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
|
|
fcode_tab[mv+MAX_MV]= f_code;
|
|
}
|
|
}
|
|
}
|
|
s->mv_penalty= mv_penalty;
|
|
s->fcode_tab= fcode_tab;
|
|
s->min_qcoeff=-255;
|
|
s->max_qcoeff= 255;
|
|
s->intra_quant_bias= 3<<(QUANT_BIAS_SHIFT-3); //(a + x*3/8)/x
|
|
s->inter_quant_bias= 0;
|
|
}
|
|
|
|
static inline void encode_dc(MpegEncContext *s, int diff, int component)
|
|
{
|
|
if (component == 0) {
|
|
put_bits(
|
|
&s->pb,
|
|
mpeg1_lum_dc_uni[diff+255]&0xFF,
|
|
mpeg1_lum_dc_uni[diff+255]>>8);
|
|
} else {
|
|
put_bits(
|
|
&s->pb,
|
|
mpeg1_chr_dc_uni[diff+255]&0xFF,
|
|
mpeg1_chr_dc_uni[diff+255]>>8);
|
|
}
|
|
}
|
|
|
|
static void mpeg1_encode_block(MpegEncContext *s,
|
|
DCTELEM *block,
|
|
int n)
|
|
{
|
|
int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
|
|
int code, component;
|
|
// RLTable *rl = &rl_mpeg1;
|
|
|
|
last_index = s->block_last_index[n];
|
|
|
|
/* DC coef */
|
|
if (s->mb_intra) {
|
|
component = (n <= 3 ? 0 : n - 4 + 1);
|
|
dc = block[0]; /* overflow is impossible */
|
|
diff = dc - s->last_dc[component];
|
|
encode_dc(s, diff, component);
|
|
s->last_dc[component] = dc;
|
|
i = 1;
|
|
} else {
|
|
/* encode the first coefficient : needs to be done here because
|
|
it is handled slightly differently */
|
|
level = block[0];
|
|
if (abs(level) == 1) {
|
|
code = ((UINT32)level >> 31); /* the sign bit */
|
|
put_bits(&s->pb, 2, code | 0x02);
|
|
i = 1;
|
|
} else {
|
|
i = 0;
|
|
last_non_zero = -1;
|
|
goto next_coef;
|
|
}
|
|
}
|
|
|
|
/* now quantify & encode AC coefs */
|
|
last_non_zero = i - 1;
|
|
|
|
for(;i<=last_index;i++) {
|
|
j = s->intra_scantable.permutated[i];
|
|
level = block[j];
|
|
next_coef:
|
|
#if 0
|
|
if (level != 0)
|
|
dprintf("level[%d]=%d\n", i, level);
|
|
#endif
|
|
/* encode using VLC */
|
|
if (level != 0) {
|
|
run = i - last_non_zero - 1;
|
|
|
|
alevel= level;
|
|
MASK_ABS(sign, alevel)
|
|
sign&=1;
|
|
|
|
// code = get_rl_index(rl, 0, run, alevel);
|
|
if (alevel > mpeg1_max_level[0][run])
|
|
code= 111; /*rl->n*/
|
|
else
|
|
code= mpeg1_index_run[0][run] + alevel - 1;
|
|
|
|
if (code < 111 /* rl->n */) {
|
|
/* store the vlc & sign at once */
|
|
put_bits(&s->pb, mpeg1_vlc[code][1]+1, (mpeg1_vlc[code][0]<<1) + sign);
|
|
} else {
|
|
/* escape seems to be pretty rare <5% so i dont optimize it */
|
|
put_bits(&s->pb, mpeg1_vlc[111/*rl->n*/][1], mpeg1_vlc[111/*rl->n*/][0]);
|
|
/* escape: only clip in this case */
|
|
put_bits(&s->pb, 6, run);
|
|
if (alevel < 128) {
|
|
put_bits(&s->pb, 8, level & 0xff);
|
|
} else {
|
|
if (level < 0) {
|
|
put_bits(&s->pb, 16, 0x8001 + level + 255);
|
|
} else {
|
|
put_bits(&s->pb, 16, level & 0xffff);
|
|
}
|
|
}
|
|
}
|
|
last_non_zero = i;
|
|
}
|
|
}
|
|
/* end of block */
|
|
put_bits(&s->pb, 2, 0x2);
|
|
}
|
|
|
|
/******************************************/
|
|
/* decoding */
|
|
|
|
static VLC dc_lum_vlc;
|
|
static VLC dc_chroma_vlc;
|
|
static VLC mv_vlc;
|
|
static VLC mbincr_vlc;
|
|
static VLC mb_ptype_vlc;
|
|
static VLC mb_btype_vlc;
|
|
static VLC mb_pat_vlc;
|
|
|
|
static void init_vlcs(MpegEncContext *s)
|
|
{
|
|
static int done = 0;
|
|
|
|
if (!done) {
|
|
done = 1;
|
|
|
|
init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
|
|
vlc_dc_lum_bits, 1, 1,
|
|
vlc_dc_lum_code, 2, 2);
|
|
init_vlc(&dc_chroma_vlc, DC_VLC_BITS, 12,
|
|
vlc_dc_chroma_bits, 1, 1,
|
|
vlc_dc_chroma_code, 2, 2);
|
|
init_vlc(&mv_vlc, MV_VLC_BITS, 17,
|
|
&mbMotionVectorTable[0][1], 2, 1,
|
|
&mbMotionVectorTable[0][0], 2, 1);
|
|
init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 35,
|
|
&mbAddrIncrTable[0][1], 2, 1,
|
|
&mbAddrIncrTable[0][0], 2, 1);
|
|
init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 63,
|
|
&mbPatTable[0][1], 2, 1,
|
|
&mbPatTable[0][0], 2, 1);
|
|
|
|
init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 32,
|
|
&table_mb_ptype[0][1], 2, 1,
|
|
&table_mb_ptype[0][0], 2, 1);
|
|
init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 32,
|
|
&table_mb_btype[0][1], 2, 1,
|
|
&table_mb_btype[0][0], 2, 1);
|
|
init_rl(&rl_mpeg1);
|
|
init_rl(&rl_mpeg2);
|
|
|
|
init_2d_vlc_rl(&rl_mpeg1);
|
|
init_2d_vlc_rl(&rl_mpeg2);
|
|
}
|
|
}
|
|
|
|
static inline int get_dmv(MpegEncContext *s)
|
|
{
|
|
if(get_bits1(&s->gb))
|
|
return 1 - (get_bits1(&s->gb) << 1);
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static inline int get_qscale(MpegEncContext *s)
|
|
{
|
|
int qscale;
|
|
if (s->mpeg2) {
|
|
if (s->q_scale_type) {
|
|
qscale = non_linear_qscale[get_bits(&s->gb, 5)];
|
|
} else {
|
|
qscale = get_bits(&s->gb, 5) << 1;
|
|
}
|
|
} else {
|
|
/* for mpeg1, we use the generic unquant code */
|
|
qscale = get_bits(&s->gb, 5);
|
|
}
|
|
return qscale;
|
|
}
|
|
|
|
/* motion type (for mpeg2) */
|
|
#define MT_FIELD 1
|
|
#define MT_FRAME 2
|
|
#define MT_16X8 2
|
|
#define MT_DMV 3
|
|
|
|
static int mpeg_decode_mb(MpegEncContext *s,
|
|
DCTELEM block[6][64])
|
|
{
|
|
int i, j, k, cbp, val, mb_type, motion_type;
|
|
|
|
dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
|
|
|
|
if (--s->mb_incr != 0) {
|
|
/* skip mb */
|
|
s->mb_intra = 0;
|
|
for(i=0;i<6;i++)
|
|
s->block_last_index[i] = -1;
|
|
s->mv_type = MV_TYPE_16X16;
|
|
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;
|
|
} 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];
|
|
}
|
|
|
|
s->mb_skiped = 1;
|
|
return 0;
|
|
}
|
|
|
|
switch(s->pict_type) {
|
|
default:
|
|
case I_TYPE:
|
|
if (get_bits1(&s->gb) == 0) {
|
|
if (get_bits1(&s->gb) == 0)
|
|
return -1;
|
|
mb_type = MB_QUANT | MB_INTRA;
|
|
} else {
|
|
mb_type = MB_INTRA;
|
|
}
|
|
break;
|
|
case P_TYPE:
|
|
mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
|
|
if (mb_type < 0){
|
|
fprintf(stderr, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
break;
|
|
case B_TYPE:
|
|
mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
|
|
if (mb_type < 0){
|
|
fprintf(stderr, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
break;
|
|
}
|
|
dprintf("mb_type=%x\n", mb_type);
|
|
motion_type = 0; /* avoid warning */
|
|
if (mb_type & (MB_FOR|MB_BACK)) {
|
|
/* get additionnal motion vector type */
|
|
if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct)
|
|
motion_type = MT_FRAME;
|
|
else
|
|
motion_type = get_bits(&s->gb, 2);
|
|
}
|
|
/* compute dct type */
|
|
if (s->picture_structure == PICT_FRAME &&
|
|
!s->frame_pred_frame_dct &&
|
|
(mb_type & (MB_PAT | MB_INTRA))) {
|
|
s->interlaced_dct = get_bits1(&s->gb);
|
|
#ifdef DEBUG
|
|
if (s->interlaced_dct)
|
|
printf("interlaced_dct\n");
|
|
#endif
|
|
} else {
|
|
s->interlaced_dct = 0; /* frame based */
|
|
}
|
|
|
|
if (mb_type & MB_QUANT) {
|
|
s->qscale = get_qscale(s);
|
|
}
|
|
if (mb_type & MB_INTRA) {
|
|
if (s->concealment_motion_vectors) {
|
|
/* just parse them */
|
|
if (s->picture_structure != PICT_FRAME)
|
|
skip_bits1(&s->gb); /* field select */
|
|
mpeg_decode_motion(s, s->mpeg_f_code[0][0], 0);
|
|
mpeg_decode_motion(s, s->mpeg_f_code[0][1], 0);
|
|
}
|
|
s->mb_intra = 1;
|
|
cbp = 0x3f;
|
|
memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
|
|
} else {
|
|
s->mb_intra = 0;
|
|
cbp = 0;
|
|
}
|
|
/* special case of implicit zero motion vector */
|
|
if (s->pict_type == P_TYPE && !(mb_type & MB_FOR)) {
|
|
s->mv_dir = MV_DIR_FORWARD;
|
|
s->mv_type = MV_TYPE_16X16;
|
|
s->last_mv[0][0][0] = 0;
|
|
s->last_mv[0][0][1] = 0;
|
|
s->last_mv[0][1][0] = 0;
|
|
s->last_mv[0][1][1] = 0;
|
|
s->mv[0][0][0] = 0;
|
|
s->mv[0][0][1] = 0;
|
|
} else if (mb_type & (MB_FOR | MB_BACK)) {
|
|
/* motion vectors */
|
|
s->mv_dir = 0;
|
|
for(i=0;i<2;i++) {
|
|
if (mb_type & (MB_FOR >> i)) {
|
|
s->mv_dir |= (MV_DIR_FORWARD >> i);
|
|
dprintf("motion_type=%d\n", motion_type);
|
|
switch(motion_type) {
|
|
case MT_FRAME: /* or MT_16X8 */
|
|
if (s->picture_structure == PICT_FRAME) {
|
|
/* MT_FRAME */
|
|
s->mv_type = MV_TYPE_16X16;
|
|
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;
|
|
/* full_pel: only for mpeg1 */
|
|
if (s->full_pel[i])
|
|
val = val << 1;
|
|
s->mv[i][0][k] = val;
|
|
dprintf("mv%d: %d\n", k, val);
|
|
}
|
|
} else {
|
|
/* MT_16X8 */
|
|
s->mv_type = MV_TYPE_16X8;
|
|
for(j=0;j<2;j++) {
|
|
s->field_select[i][j] = 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][j][k]);
|
|
s->last_mv[i][j][k] = val;
|
|
s->mv[i][j][k] = val;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
case MT_FIELD:
|
|
if (s->picture_structure == PICT_FRAME) {
|
|
s->mv_type = MV_TYPE_FIELD;
|
|
for(j=0;j<2;j++) {
|
|
s->field_select[i][j] = get_bits1(&s->gb);
|
|
val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
|
|
s->last_mv[i][j][0]);
|
|
s->last_mv[i][j][0] = val;
|
|
s->mv[i][j][0] = val;
|
|
dprintf("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("fmy=%d\n", val);
|
|
}
|
|
} else {
|
|
s->mv_type = MV_TYPE_16X16;
|
|
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:
|
|
{
|
|
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->mv_type = MV_TYPE_DMV;
|
|
/* XXX: totally broken */
|
|
if (s->picture_structure == PICT_FRAME) {
|
|
s->last_mv[i][0][1] = my << 1;
|
|
s->last_mv[i][1][1] = my << 1;
|
|
|
|
m = s->top_field_first ? 1 : 3;
|
|
/* top -> top pred */
|
|
s->mv[i][0][0] = mx;
|
|
s->mv[i][0][1] = my << 1;
|
|
s->mv[i][1][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
|
|
s->mv[i][1][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
|
|
m = 4 - m;
|
|
s->mv[i][2][0] = mx;
|
|
s->mv[i][2][1] = my << 1;
|
|
s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
|
|
s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
|
|
} else {
|
|
s->last_mv[i][0][1] = my;
|
|
s->last_mv[i][1][1] = my;
|
|
s->mv[i][0][0] = mx;
|
|
s->mv[i][0][1] = my;
|
|
s->mv[i][1][0] = ((mx + (mx > 0)) >> 1) + dmx;
|
|
s->mv[i][1][1] = ((my + (my > 0)) >> 1) + dmy - 1
|
|
/* + 2 * cur_field */;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if ((mb_type & MB_INTRA) && s->concealment_motion_vectors) {
|
|
skip_bits1(&s->gb); /* marker */
|
|
}
|
|
|
|
if (mb_type & MB_PAT) {
|
|
cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
|
|
if (cbp < 0){
|
|
fprintf(stderr, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
cbp++;
|
|
}
|
|
dprintf("cbp=%x\n", cbp);
|
|
|
|
if (s->mpeg2) {
|
|
if (s->mb_intra) {
|
|
for(i=0;i<6;i++) {
|
|
if (mpeg2_decode_block_intra(s, block[i], i) < 0)
|
|
return -1;
|
|
}
|
|
} else {
|
|
for(i=0;i<6;i++) {
|
|
if (cbp & 32) {
|
|
if (mpeg2_decode_block_non_intra(s, block[i], i) < 0)
|
|
return -1;
|
|
} else {
|
|
s->block_last_index[i] = -1;
|
|
}
|
|
cbp+=cbp;
|
|
}
|
|
}
|
|
} else {
|
|
if (s->mb_intra) {
|
|
for(i=0;i<6;i++) {
|
|
if (mpeg1_decode_block_intra(s, block[i], i) < 0)
|
|
return -1;
|
|
}
|
|
}else{
|
|
for(i=0;i<6;i++) {
|
|
if (cbp & 32) {
|
|
if (mpeg1_decode_block_inter(s, block[i], i) < 0)
|
|
return -1;
|
|
} else {
|
|
s->block_last_index[i] = -1;
|
|
}
|
|
cbp+=cbp;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* as h263, but only 17 codes */
|
|
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
|
|
{
|
|
int code, sign, val, m, l, shift;
|
|
|
|
code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
|
|
if (code < 0) {
|
|
return 0xffff;
|
|
}
|
|
if (code == 0) {
|
|
return pred;
|
|
}
|
|
sign = get_bits1(&s->gb);
|
|
shift = fcode - 1;
|
|
val = (code - 1) << shift;
|
|
if (shift > 0)
|
|
val |= get_bits(&s->gb, shift);
|
|
val++;
|
|
if (sign)
|
|
val = -val;
|
|
val += pred;
|
|
|
|
/* modulo decoding */
|
|
l = (1 << shift) * 16;
|
|
m = 2 * l;
|
|
if (val < -l) {
|
|
val += m;
|
|
} else if (val >= l) {
|
|
val -= m;
|
|
}
|
|
return val;
|
|
}
|
|
|
|
static inline int decode_dc(MpegEncContext *s, int component)
|
|
{
|
|
int code, diff;
|
|
|
|
if (component == 0) {
|
|
code = get_vlc2(&s->gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
|
|
} else {
|
|
code = get_vlc2(&s->gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
|
|
}
|
|
if (code < 0){
|
|
fprintf(stderr, "invalid dc code at %d %d\n", s->mb_x, s->mb_y);
|
|
return 0xffff;
|
|
}
|
|
if (code == 0) {
|
|
diff = 0;
|
|
} else {
|
|
diff = get_bits(&s->gb, code);
|
|
if ((diff & (1 << (code - 1))) == 0)
|
|
diff = (-1 << code) | (diff + 1);
|
|
}
|
|
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 = &rl_mpeg1;
|
|
UINT8 * const scantable= s->intra_scantable.permutated;
|
|
const UINT16 *quant_matrix= s->intra_matrix;
|
|
const int qscale= s->qscale;
|
|
|
|
/* DC coef */
|
|
component = (n <= 3 ? 0 : n - 4 + 1);
|
|
diff = decode_dc(s, component);
|
|
if (diff >= 0xffff)
|
|
return -1;
|
|
dc = s->last_dc[component];
|
|
dc += diff;
|
|
s->last_dc[component] = dc;
|
|
block[0] = dc<<3;
|
|
dprintf("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);
|
|
|
|
if(level == 127){
|
|
break;
|
|
} else if(level != 0) {
|
|
i += run;
|
|
j = scantable[i];
|
|
level= (level*qscale*quant_matrix[j])>>3;
|
|
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])>>3;
|
|
level= (level-1)|1;
|
|
level= -level;
|
|
}else{
|
|
level= (level*qscale*quant_matrix[j])>>3;
|
|
level= (level-1)|1;
|
|
}
|
|
}
|
|
if (i > 63){
|
|
fprintf(stderr, "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 = &rl_mpeg1;
|
|
UINT8 * const scantable= s->intra_scantable.permutated;
|
|
const UINT16 *quant_matrix= s->inter_matrix;
|
|
const int qscale= s->qscale;
|
|
|
|
{
|
|
int v;
|
|
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);
|
|
v= SHOW_UBITS(re, &s->gb, 2);
|
|
if (v & 2) {
|
|
LAST_SKIP_BITS(re, &s->gb, 2);
|
|
level= (3*qscale*quant_matrix[0])>>4;
|
|
level= (level-1)|1;
|
|
if(v&1)
|
|
level= -level;
|
|
block[0] = level;
|
|
i++;
|
|
}
|
|
|
|
/* 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);
|
|
|
|
if(level == 127){
|
|
break;
|
|
} else if(level != 0) {
|
|
i += run;
|
|
j = scantable[i];
|
|
level= ((level*2+1)*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*2+1)*qscale*quant_matrix[j])>>4;
|
|
level= (level-1)|1;
|
|
level= -level;
|
|
}else{
|
|
level= ((level*2+1)*qscale*quant_matrix[j])>>4;
|
|
level= (level-1)|1;
|
|
}
|
|
}
|
|
if (i > 63){
|
|
fprintf(stderr, "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;
|
|
}
|
|
|
|
/* Also does unquantization here, since I will never support mpeg2
|
|
encoding */
|
|
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
|
|
DCTELEM *block,
|
|
int n)
|
|
{
|
|
int level, i, j, run;
|
|
RLTable *rl = &rl_mpeg1;
|
|
UINT8 * const scantable= s->intra_scantable.permutated;
|
|
const UINT16 *quant_matrix;
|
|
const int qscale= s->qscale;
|
|
int mismatch;
|
|
|
|
mismatch = 1;
|
|
|
|
{
|
|
int v;
|
|
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);
|
|
v= SHOW_UBITS(re, &s->gb, 2);
|
|
if (v & 2) {
|
|
LAST_SKIP_BITS(re, &s->gb, 2);
|
|
level= (3*qscale*quant_matrix[0])>>5;
|
|
if(v&1)
|
|
level= -level;
|
|
block[0] = level;
|
|
mismatch ^= level;
|
|
i++;
|
|
}
|
|
|
|
/* 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);
|
|
|
|
if(level == 127){
|
|
break;
|
|
} else 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);
|
|
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*2+1)*qscale*quant_matrix[j])>>5;
|
|
level= -level;
|
|
}else{
|
|
level= ((level*2+1)*qscale*quant_matrix[j])>>5;
|
|
}
|
|
}
|
|
if (i > 63){
|
|
fprintf(stderr, "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_decode_block_intra(MpegEncContext *s,
|
|
DCTELEM *block,
|
|
int n)
|
|
{
|
|
int level, dc, diff, i, j, run;
|
|
int component;
|
|
RLTable *rl;
|
|
UINT8 * const scantable= s->intra_scantable.permutated;
|
|
const UINT16 *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 - 3;
|
|
}
|
|
diff = decode_dc(s, 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("dc=%d\n", block[0]);
|
|
mismatch = block[0] ^ 1;
|
|
i = 0;
|
|
if (s->intra_vlc_format)
|
|
rl = &rl_mpeg2;
|
|
else
|
|
rl = &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);
|
|
|
|
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){
|
|
fprintf(stderr, "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;
|
|
}
|
|
|
|
/* compressed picture size */
|
|
#define PICTURE_BUFFER_SIZE 100000
|
|
|
|
typedef struct Mpeg1Context {
|
|
MpegEncContext mpeg_enc_ctx;
|
|
UINT32 header_state;
|
|
int start_code; /* current start code */
|
|
UINT8 buffer[PICTURE_BUFFER_SIZE];
|
|
UINT8 *buf_ptr;
|
|
int buffer_size;
|
|
int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
|
|
int repeat_field; /* true if we must repeat the field */
|
|
} Mpeg1Context;
|
|
|
|
static int mpeg_decode_init(AVCodecContext *avctx)
|
|
{
|
|
Mpeg1Context *s = avctx->priv_data;
|
|
|
|
s->mpeg_enc_ctx.flags= avctx->flags;
|
|
common_init(&s->mpeg_enc_ctx);
|
|
init_vlcs(&s->mpeg_enc_ctx);
|
|
|
|
s->header_state = 0xff;
|
|
s->mpeg_enc_ctx_allocated = 0;
|
|
s->buffer_size = PICTURE_BUFFER_SIZE;
|
|
s->start_code = -1;
|
|
s->buf_ptr = s->buffer;
|
|
s->mpeg_enc_ctx.picture_number = 0;
|
|
s->repeat_field = 0;
|
|
s->mpeg_enc_ctx.codec_id= avctx->codec->id;
|
|
return 0;
|
|
}
|
|
|
|
/* return the 8 bit start code value and update the search
|
|
state. Return -1 if no start code found */
|
|
static int find_start_code(UINT8 **pbuf_ptr, UINT8 *buf_end,
|
|
UINT32 *header_state)
|
|
{
|
|
UINT8 *buf_ptr;
|
|
unsigned int state, v;
|
|
int val;
|
|
|
|
state = *header_state;
|
|
buf_ptr = *pbuf_ptr;
|
|
while (buf_ptr < buf_end) {
|
|
v = *buf_ptr++;
|
|
if (state == 0x000001) {
|
|
state = ((state << 8) | v) & 0xffffff;
|
|
val = state;
|
|
goto found;
|
|
}
|
|
state = ((state << 8) | v) & 0xffffff;
|
|
}
|
|
val = -1;
|
|
found:
|
|
*pbuf_ptr = buf_ptr;
|
|
*header_state = state;
|
|
return val;
|
|
}
|
|
|
|
static int mpeg1_decode_picture(AVCodecContext *avctx,
|
|
UINT8 *buf, int buf_size)
|
|
{
|
|
Mpeg1Context *s1 = avctx->priv_data;
|
|
MpegEncContext *s = &s1->mpeg_enc_ctx;
|
|
int ref, f_code;
|
|
|
|
init_get_bits(&s->gb, buf, buf_size);
|
|
|
|
ref = get_bits(&s->gb, 10); /* temporal ref */
|
|
s->pict_type = get_bits(&s->gb, 3);
|
|
dprintf("pict_type=%d number=%d\n", s->pict_type, s->picture_number);
|
|
|
|
skip_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)
|
|
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)
|
|
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;
|
|
|
|
s->y_dc_scale = 8;
|
|
s->c_dc_scale = 8;
|
|
s->first_slice = 1;
|
|
return 0;
|
|
}
|
|
|
|
static void mpeg_decode_sequence_extension(MpegEncContext *s)
|
|
{
|
|
int horiz_size_ext, vert_size_ext;
|
|
int bit_rate_ext, vbv_buf_ext;
|
|
int frame_rate_ext_n, frame_rate_ext_d;
|
|
float aspect;
|
|
|
|
skip_bits(&s->gb, 8); /* profil and level */
|
|
s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
|
|
skip_bits(&s->gb, 2); /* chroma_format */
|
|
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 = ((s->bit_rate / 400) | (bit_rate_ext << 12)) * 400;
|
|
skip_bits1(&s->gb); /* marker */
|
|
vbv_buf_ext = get_bits(&s->gb, 8);
|
|
s->low_delay = get_bits1(&s->gb);
|
|
frame_rate_ext_n = get_bits(&s->gb, 2);
|
|
frame_rate_ext_d = get_bits(&s->gb, 5);
|
|
if (frame_rate_ext_d >= 1)
|
|
s->frame_rate = (s->frame_rate * frame_rate_ext_n) / frame_rate_ext_d;
|
|
dprintf("sequence extension\n");
|
|
s->mpeg2 = 1;
|
|
s->avctx->sub_id = 2; /* indicates mpeg2 found */
|
|
|
|
aspect= mpeg2_aspect[s->aspect_ratio_info];
|
|
if(aspect>0.0) s->avctx->aspect_ratio= s->width/(aspect*s->height);
|
|
else if(aspect<0.0) s->avctx->aspect_ratio= -1.0/aspect;
|
|
}
|
|
|
|
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
|
|
{
|
|
int i, v, j;
|
|
|
|
dprintf("matrix extension\n");
|
|
|
|
if (get_bits1(&s->gb)) {
|
|
for(i=0;i<64;i++) {
|
|
v = get_bits(&s->gb, 8);
|
|
j= s->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->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->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->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->alternate_scan){
|
|
ff_init_scantable(s, &s->inter_scantable , ff_alternate_vertical_scan);
|
|
ff_init_scantable(s, &s->intra_scantable , ff_alternate_vertical_scan);
|
|
ff_init_scantable(s, &s->intra_h_scantable, ff_alternate_vertical_scan);
|
|
ff_init_scantable(s, &s->intra_v_scantable, ff_alternate_vertical_scan);
|
|
}else{
|
|
ff_init_scantable(s, &s->inter_scantable , ff_zigzag_direct);
|
|
ff_init_scantable(s, &s->intra_scantable , ff_zigzag_direct);
|
|
ff_init_scantable(s, &s->intra_h_scantable, ff_alternate_horizontal_scan);
|
|
ff_init_scantable(s, &s->intra_v_scantable, ff_alternate_vertical_scan);
|
|
}
|
|
|
|
/* composite display not parsed */
|
|
dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
|
|
dprintf("picture_structure=%d\n", s->picture_structure);
|
|
dprintf("top field first=%d\n", s->top_field_first);
|
|
dprintf("repeat first field=%d\n", s->repeat_first_field);
|
|
dprintf("conceal=%d\n", s->concealment_motion_vectors);
|
|
dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
|
|
dprintf("alternate_scan=%d\n", s->alternate_scan);
|
|
dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
|
|
dprintf("progressive_frame=%d\n", s->progressive_frame);
|
|
}
|
|
|
|
static void mpeg_decode_extension(AVCodecContext *avctx,
|
|
UINT8 *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);
|
|
|
|
ext_type = get_bits(&s->gb, 4);
|
|
switch(ext_type) {
|
|
case 0x1:
|
|
/* sequence ext */
|
|
mpeg_decode_sequence_extension(s);
|
|
break;
|
|
case 0x3:
|
|
/* quant matrix extension */
|
|
mpeg_decode_quant_matrix_extension(s);
|
|
break;
|
|
case 0x8:
|
|
/* picture extension */
|
|
mpeg_decode_picture_coding_extension(s);
|
|
break;
|
|
}
|
|
}
|
|
|
|
#define DECODE_SLICE_FATAL_ERROR -2
|
|
#define DECODE_SLICE_ERROR -1
|
|
#define DECODE_SLICE_OK 0
|
|
#define DECODE_SLICE_EOP 1
|
|
|
|
/**
|
|
* decodes a slice.
|
|
* @return DECODE_SLICE_FATAL_ERROR if a non recoverable error occured<br>
|
|
* DECODE_SLICE_ERROR if the slice is damaged<br>
|
|
* DECODE_SLICE_OK if this slice is ok<br>
|
|
* DECODE_SLICE_EOP if the end of the picture is reached
|
|
*/
|
|
static int mpeg_decode_slice(AVCodecContext *avctx,
|
|
AVFrame *pict,
|
|
int start_code,
|
|
UINT8 *buf, int buf_size)
|
|
{
|
|
Mpeg1Context *s1 = avctx->priv_data;
|
|
MpegEncContext *s = &s1->mpeg_enc_ctx;
|
|
int ret;
|
|
|
|
start_code = (start_code - 1) & 0xff;
|
|
if (start_code >= s->mb_height){
|
|
fprintf(stderr, "slice below image (%d >= %d)\n", start_code, s->mb_height);
|
|
return DECODE_SLICE_ERROR;
|
|
}
|
|
s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
|
|
s->last_dc[1] = s->last_dc[0];
|
|
s->last_dc[2] = s->last_dc[0];
|
|
memset(s->last_mv, 0, sizeof(s->last_mv));
|
|
/* start frame decoding */
|
|
if (s->first_slice) {
|
|
s->first_slice = 0;
|
|
if(MPV_frame_start(s, avctx) < 0)
|
|
return DECODE_SLICE_FATAL_ERROR;
|
|
|
|
if(s->avctx->debug&FF_DEBUG_PICT_INFO){
|
|
printf("qp:%d fc:%d%d%d%d %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 ? "pro" :"", 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" :"");
|
|
}
|
|
}
|
|
|
|
init_get_bits(&s->gb, buf, buf_size);
|
|
|
|
s->qscale = get_qscale(s);
|
|
/* 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)
|
|
return -1; /* error = end of slice, but empty slice is bad or?*/
|
|
if (code >= 33) {
|
|
if (code == 33) {
|
|
s->mb_x += 33;
|
|
}
|
|
/* otherwise, stuffing, nothing to do */
|
|
} else {
|
|
s->mb_x += code;
|
|
break;
|
|
}
|
|
}
|
|
s->mb_y = start_code;
|
|
s->mb_incr= 1;
|
|
|
|
for(;;) {
|
|
s->dsp.clear_blocks(s->block[0]);
|
|
|
|
ret = mpeg_decode_mb(s, s->block);
|
|
dprintf("ret=%d\n", ret);
|
|
if (ret < 0)
|
|
return -1;
|
|
|
|
MPV_decode_mb(s, s->block);
|
|
|
|
if (++s->mb_x >= s->mb_width) {
|
|
ff_draw_horiz_band(s);
|
|
|
|
s->mb_x = 0;
|
|
s->mb_y++;
|
|
PRINT_QP("%s", "\n");
|
|
}
|
|
PRINT_QP("%2d", s->qscale);
|
|
|
|
/* skip mb handling */
|
|
if (s->mb_incr == 0) {
|
|
/* read again increment */
|
|
s->mb_incr = 1;
|
|
for(;;) {
|
|
int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
|
|
if (code < 0)
|
|
goto eos; /* error = end of slice */
|
|
if (code >= 33) {
|
|
if (code == 33) {
|
|
s->mb_incr += 33;
|
|
}
|
|
/* otherwise, stuffing, nothing to do */
|
|
} else {
|
|
s->mb_incr += code;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if(s->mb_y >= s->mb_height){
|
|
fprintf(stderr, "slice too long\n");
|
|
return DECODE_SLICE_ERROR;
|
|
}
|
|
}
|
|
eos: //end of slice
|
|
|
|
emms_c();
|
|
|
|
/* end of slice reached */
|
|
if (/*s->mb_x == 0 &&*/
|
|
s->mb_y == s->mb_height) {
|
|
/* end of image */
|
|
|
|
if(s->mpeg2)
|
|
s->qscale >>=1;
|
|
|
|
MPV_frame_end(s);
|
|
|
|
if (s->pict_type == B_TYPE || s->low_delay) {
|
|
*pict= *(AVFrame*)&s->current_picture;
|
|
} else {
|
|
s->picture_number++;
|
|
/* latency of 1 frame for I and P frames */
|
|
/* XXX: use another variable than picture_number */
|
|
if (s->last_picture.data[0] == NULL) {
|
|
return DECODE_SLICE_OK;
|
|
} else {
|
|
*pict= *(AVFrame*)&s->last_picture;
|
|
}
|
|
}
|
|
return DECODE_SLICE_EOP;
|
|
} else {
|
|
return DECODE_SLICE_OK;
|
|
}
|
|
}
|
|
|
|
static int mpeg1_decode_sequence(AVCodecContext *avctx,
|
|
UINT8 *buf, int buf_size)
|
|
{
|
|
Mpeg1Context *s1 = avctx->priv_data;
|
|
MpegEncContext *s = &s1->mpeg_enc_ctx;
|
|
int width, height, i, v, j;
|
|
float aspect;
|
|
|
|
init_get_bits(&s->gb, buf, buf_size);
|
|
|
|
width = get_bits(&s->gb, 12);
|
|
height = get_bits(&s->gb, 12);
|
|
s->aspect_ratio_info= get_bits(&s->gb, 4);
|
|
if(!s->mpeg2){
|
|
aspect= mpeg1_aspect[s->aspect_ratio_info];
|
|
if(aspect!=0.0) avctx->aspect_ratio= width/(aspect*height);
|
|
}
|
|
|
|
s->frame_rate_index = get_bits(&s->gb, 4);
|
|
if (s->frame_rate_index == 0)
|
|
return -1;
|
|
s->bit_rate = get_bits(&s->gb, 18) * 400;
|
|
if (get_bits1(&s->gb) == 0) /* marker */
|
|
return -1;
|
|
if (width <= 0 || height <= 0 ||
|
|
(width % 2) != 0 || (height % 2) != 0)
|
|
return -1;
|
|
if (width != s->width ||
|
|
height != s->height) {
|
|
/* start new mpeg1 context decoding */
|
|
s->out_format = FMT_MPEG1;
|
|
if (s1->mpeg_enc_ctx_allocated) {
|
|
MPV_common_end(s);
|
|
}
|
|
s->width = width;
|
|
s->height = height;
|
|
avctx->has_b_frames= 1;
|
|
s->avctx = avctx;
|
|
avctx->width = width;
|
|
avctx->height = height;
|
|
if (s->frame_rate_index >= 9) {
|
|
/* at least give a valid frame rate (some old mpeg1 have this) */
|
|
avctx->frame_rate = 25 * FRAME_RATE_BASE;
|
|
} else {
|
|
avctx->frame_rate = frame_rate_tab[s->frame_rate_index];
|
|
}
|
|
s->frame_rate = avctx->frame_rate;
|
|
avctx->bit_rate = s->bit_rate;
|
|
|
|
if (MPV_common_init(s) < 0)
|
|
return -1;
|
|
s1->mpeg_enc_ctx_allocated = 1;
|
|
}
|
|
|
|
skip_bits(&s->gb, 10); /* vbv_buffer_size */
|
|
skip_bits(&s->gb, 1);
|
|
|
|
/* get matrix */
|
|
if (get_bits1(&s->gb)) {
|
|
for(i=0;i<64;i++) {
|
|
v = get_bits(&s->gb, 8);
|
|
j = s->intra_scantable.permutated[i];
|
|
s->intra_matrix[j] = v;
|
|
s->chroma_intra_matrix[j] = v;
|
|
}
|
|
#ifdef DEBUG
|
|
dprintf("intra matrix present\n");
|
|
for(i=0;i<64;i++)
|
|
dprintf(" %d", s->intra_matrix[s->intra_scantable.permutated[i]]);
|
|
printf("\n");
|
|
#endif
|
|
} else {
|
|
for(i=0;i<64;i++) {
|
|
int j= s->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);
|
|
j = s->intra_scantable.permutated[i];
|
|
s->inter_matrix[j] = v;
|
|
s->chroma_inter_matrix[j] = v;
|
|
}
|
|
#ifdef DEBUG
|
|
dprintf("non intra matrix present\n");
|
|
for(i=0;i<64;i++)
|
|
dprintf(" %d", s->inter_matrix[s->intra_scantable.permutated[i]]);
|
|
printf("\n");
|
|
#endif
|
|
} else {
|
|
for(i=0;i<64;i++) {
|
|
int j= s->idct_permutation[i];
|
|
v = ff_mpeg1_default_non_intra_matrix[i];
|
|
s->inter_matrix[j] = v;
|
|
s->chroma_inter_matrix[j] = v;
|
|
}
|
|
}
|
|
|
|
/* 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->mpeg2 = 0;
|
|
avctx->sub_id = 1; /* indicates mpeg1 */
|
|
return 0;
|
|
}
|
|
|
|
/* handle buffering and image synchronisation */
|
|
static int mpeg_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
UINT8 *buf, int buf_size)
|
|
{
|
|
Mpeg1Context *s = avctx->priv_data;
|
|
UINT8 *buf_end, *buf_ptr, *buf_start;
|
|
int len, start_code_found, ret, code, start_code, input_size;
|
|
AVFrame *picture = data;
|
|
MpegEncContext *s2 = &s->mpeg_enc_ctx;
|
|
|
|
dprintf("fill_buffer\n");
|
|
|
|
*data_size = 0;
|
|
|
|
/* special case for last picture */
|
|
if (buf_size == 0) {
|
|
if (s2->picture_number > 0) {
|
|
*picture= *(AVFrame*)&s2->next_picture;
|
|
|
|
*data_size = sizeof(AVFrame);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
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
|
|
while (buf_ptr < buf_end) {
|
|
buf_start = buf_ptr;
|
|
/* find start next code */
|
|
code = find_start_code(&buf_ptr, buf_end, &s->header_state);
|
|
if (code >= 0) {
|
|
start_code_found = 1;
|
|
} else {
|
|
start_code_found = 0;
|
|
}
|
|
/* copy to buffer */
|
|
len = buf_ptr - buf_start;
|
|
if (len + (s->buf_ptr - s->buffer) > s->buffer_size) {
|
|
/* data too big : flush */
|
|
s->buf_ptr = s->buffer;
|
|
if (start_code_found)
|
|
s->start_code = code;
|
|
} else {
|
|
memcpy(s->buf_ptr, buf_start, len);
|
|
s->buf_ptr += len;
|
|
if( (!(s2->flags&CODEC_FLAG_TRUNCATED)) && (!start_code_found)
|
|
&& s->buf_ptr+4<s->buffer+s->buffer_size){
|
|
start_code_found= 1;
|
|
code= 0x1FF;
|
|
s->header_state=0xFF;
|
|
s->buf_ptr[0]=0;
|
|
s->buf_ptr[1]=0;
|
|
s->buf_ptr[2]=1;
|
|
s->buf_ptr[3]=0xFF;
|
|
s->buf_ptr+=4;
|
|
}
|
|
if (start_code_found) {
|
|
/* prepare data for next start code */
|
|
input_size = s->buf_ptr - s->buffer;
|
|
start_code = s->start_code;
|
|
s->buf_ptr = s->buffer;
|
|
s->start_code = code;
|
|
switch(start_code) {
|
|
case SEQ_START_CODE:
|
|
mpeg1_decode_sequence(avctx, s->buffer,
|
|
input_size);
|
|
break;
|
|
|
|
case PICTURE_START_CODE:
|
|
/* we have a complete image : we try to decompress it */
|
|
mpeg1_decode_picture(avctx,
|
|
s->buffer, input_size);
|
|
break;
|
|
case EXT_START_CODE:
|
|
mpeg_decode_extension(avctx,
|
|
s->buffer, input_size);
|
|
break;
|
|
default:
|
|
if (start_code >= SLICE_MIN_START_CODE &&
|
|
start_code <= SLICE_MAX_START_CODE) {
|
|
|
|
/* skip b frames if we dont have reference frames */
|
|
if(s2->last_picture.data[0]==NULL && s2->pict_type==B_TYPE) break;
|
|
/* skip b frames if we are in a hurry */
|
|
if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
|
|
/* skip everything if we are in a hurry>=5 */
|
|
if(avctx->hurry_up>=5) break;
|
|
|
|
ret = mpeg_decode_slice(avctx, picture,
|
|
start_code, s->buffer, input_size);
|
|
if (ret == DECODE_SLICE_EOP) {
|
|
/* got a picture: exit */
|
|
/* first check if we must repeat the frame */
|
|
avctx->repeat_pict = 0;
|
|
#if 0
|
|
if (s2->progressive_frame && s2->repeat_first_field) {
|
|
//fprintf(stderr,"\nRepeat this frame: %d! pict: %d",avctx->frame_number,s2->picture_number);
|
|
//s2->repeat_first_field = 0;
|
|
//s2->progressive_frame = 0;
|
|
if (++s->repeat_field > 2)
|
|
s->repeat_field = 0;
|
|
avctx->repeat_pict = 1;
|
|
}
|
|
#endif
|
|
if (s2->repeat_first_field) {
|
|
if (s2->progressive_sequence) {
|
|
if (s2->top_field_first)
|
|
avctx->repeat_pict = 4;
|
|
else
|
|
avctx->repeat_pict = 2;
|
|
} else if (s2->progressive_frame) {
|
|
avctx->repeat_pict = 1;
|
|
}
|
|
}
|
|
*data_size = sizeof(AVPicture);
|
|
goto the_end;
|
|
}else if(ret<0){
|
|
fprintf(stderr,"Error while decoding slice\n");
|
|
if(ret==DECODE_SLICE_FATAL_ERROR) return -1;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
the_end:
|
|
return buf_ptr - buf;
|
|
}
|
|
|
|
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 mpeg_decoder = {
|
|
"mpegvideo",
|
|
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,
|
|
};
|