3 * Copyright (c) 2000,2001 Fabrice Bellard.
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
31 #include "mpegvideo.h"
34 #include "mpeg12data.h"
35 #include "mpeg12decdata.h"
36 #include "bytestream.h"
43 #define MBINCR_VLC_BITS 9
44 #define MB_PAT_VLC_BITS 9
45 #define MB_PTYPE_VLC_BITS 6
46 #define MB_BTYPE_VLC_BITS 6
48 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
51 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
54 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
55 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
58 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
61 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
62 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
63 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
64 static void exchange_uv(MpegEncContext *s);
66 extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
67 extern int XVMC_field_end(MpegEncContext *s);
68 extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
69 extern void XVMC_init_block(MpegEncContext *s);//set s->block
71 static const enum PixelFormat pixfmt_yuv_420[]= {PIX_FMT_YUV420P,PIX_FMT_NONE};
72 static const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,PIX_FMT_NONE};
73 static const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,PIX_FMT_NONE};
74 static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
75 PIX_FMT_XVMC_MPEG2_IDCT,
76 PIX_FMT_XVMC_MPEG2_MC,
79 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
82 #define INIT_2D_VLC_RL(rl, static_size)\
84 static RL_VLC_ELEM rl_vlc_table[static_size];\
85 INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
86 &rl.table_vlc[0][1], 4, 2,\
87 &rl.table_vlc[0][0], 4, 2, static_size);\
89 rl.rl_vlc[0]= rl_vlc_table;\
93 static void init_2d_vlc_rl(RLTable *rl)
97 for(i=0; i<rl->vlc.table_size; i++){
98 int code= rl->vlc.table[i][0];
99 int len = rl->vlc.table[i][1];
102 if(len==0){ // illegal code
105 }else if(len<0){ //more bits needed
109 if(code==rl->n){ //esc
112 }else if(code==rl->n+1){ //eob
116 run= rl->table_run [code] + 1;
117 level= rl->table_level[code];
120 rl->rl_vlc[0][i].len= len;
121 rl->rl_vlc[0][i].level= level;
122 rl->rl_vlc[0][i].run= run;
126 void ff_mpeg12_common_init(MpegEncContext *s)
130 s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
134 void ff_mpeg1_clean_buffers(MpegEncContext *s){
135 s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
136 s->last_dc[1] = s->last_dc[0];
137 s->last_dc[2] = s->last_dc[0];
138 memset(s->last_mv, 0, sizeof(s->last_mv));
142 /******************************************/
146 static VLC mbincr_vlc;
147 static VLC mb_ptype_vlc;
148 static VLC mb_btype_vlc;
149 static VLC mb_pat_vlc;
151 av_cold void ff_init_vlcs(void)
158 INIT_VLC_STATIC(&dc_lum_vlc, DC_VLC_BITS, 12,
159 ff_mpeg12_vlc_dc_lum_bits, 1, 1,
160 ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
161 INIT_VLC_STATIC(&dc_chroma_vlc, DC_VLC_BITS, 12,
162 ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
163 ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
164 INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
165 &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
166 &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
167 INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
168 &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
169 &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
170 INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
171 &ff_mpeg12_mbPatTable[0][1], 2, 1,
172 &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
174 INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
175 &table_mb_ptype[0][1], 2, 1,
176 &table_mb_ptype[0][0], 2, 1, 64);
177 INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
178 &table_mb_btype[0][1], 2, 1,
179 &table_mb_btype[0][0], 2, 1, 64);
180 init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
181 init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
183 INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
184 INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
188 static inline int get_dmv(MpegEncContext *s)
190 if(get_bits1(&s->gb))
191 return 1 - (get_bits1(&s->gb) << 1);
196 static inline int get_qscale(MpegEncContext *s)
198 int qscale = get_bits(&s->gb, 5);
199 if (s->q_scale_type) {
200 return non_linear_qscale[qscale];
206 /* motion type (for MPEG-2) */
212 static int mpeg_decode_mb(MpegEncContext *s,
213 DCTELEM block[12][64])
215 int i, j, k, cbp, val, mb_type, motion_type;
216 const int mb_block_count = 4 + (1<< s->chroma_format);
218 dprintf(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
220 assert(s->mb_skipped==0);
222 if (s->mb_skip_run-- != 0) {
223 if (s->pict_type == FF_P_TYPE) {
225 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
230 mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
232 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
233 if(IS_INTRA(mb_type))
236 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
237 mb_type | MB_TYPE_SKIP;
238 // assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
240 if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
247 switch(s->pict_type) {
250 if (get_bits1(&s->gb) == 0) {
251 if (get_bits1(&s->gb) == 0){
252 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
255 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
257 mb_type = MB_TYPE_INTRA;
261 mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
263 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
266 mb_type = ptype2mb_type[ mb_type ];
269 mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
271 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
274 mb_type = btype2mb_type[ mb_type ];
277 dprintf(s->avctx, "mb_type=%x\n", mb_type);
278 // motion_type = 0; /* avoid warning */
279 if (IS_INTRA(mb_type)) {
280 s->dsp.clear_blocks(s->block[0]);
282 if(!s->chroma_y_shift){
283 s->dsp.clear_blocks(s->block[6]);
286 /* compute DCT type */
287 if (s->picture_structure == PICT_FRAME && //FIXME add an interlaced_dct coded var?
288 !s->frame_pred_frame_dct) {
289 s->interlaced_dct = get_bits1(&s->gb);
292 if (IS_QUANT(mb_type))
293 s->qscale = get_qscale(s);
295 if (s->concealment_motion_vectors) {
296 /* just parse them */
297 if (s->picture_structure != PICT_FRAME)
298 skip_bits1(&s->gb); /* field select */
300 s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
301 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
302 s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
303 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
305 skip_bits1(&s->gb); /* marker */
307 memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
310 //if 1, we memcpy blocks in xvmcvideo
311 if(s->avctx->xvmc_acceleration > 1){
312 XVMC_pack_pblocks(s,-1);//inter are always full blocks
319 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
320 if(s->flags2 & CODEC_FLAG2_FAST){
322 mpeg2_fast_decode_block_intra(s, s->pblocks[i], i);
325 for(i=0;i<mb_block_count;i++) {
326 if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
332 if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
337 if (mb_type & MB_TYPE_ZERO_MV){
338 assert(mb_type & MB_TYPE_CBP);
340 s->mv_dir = MV_DIR_FORWARD;
341 if(s->picture_structure == PICT_FRAME){
342 if(!s->frame_pred_frame_dct)
343 s->interlaced_dct = get_bits1(&s->gb);
344 s->mv_type = MV_TYPE_16X16;
346 s->mv_type = MV_TYPE_FIELD;
347 mb_type |= MB_TYPE_INTERLACED;
348 s->field_select[0][0]= s->picture_structure - 1;
351 if (IS_QUANT(mb_type))
352 s->qscale = get_qscale(s);
354 s->last_mv[0][0][0] = 0;
355 s->last_mv[0][0][1] = 0;
356 s->last_mv[0][1][0] = 0;
357 s->last_mv[0][1][1] = 0;
361 assert(mb_type & MB_TYPE_L0L1);
362 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
363 /* get additional motion vector type */
364 if (s->frame_pred_frame_dct)
365 motion_type = MT_FRAME;
367 motion_type = get_bits(&s->gb, 2);
368 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
369 s->interlaced_dct = get_bits1(&s->gb);
372 if (IS_QUANT(mb_type))
373 s->qscale = get_qscale(s);
376 s->mv_dir= (mb_type>>13)&3;
377 dprintf(s->avctx, "motion_type=%d\n", motion_type);
378 switch(motion_type) {
379 case MT_FRAME: /* or MT_16X8 */
380 if (s->picture_structure == PICT_FRAME) {
381 mb_type |= MB_TYPE_16x16;
382 s->mv_type = MV_TYPE_16X16;
384 if (USES_LIST(mb_type, i)) {
386 s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
387 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
388 s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
389 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
390 /* full_pel: only for MPEG-1 */
392 s->mv[i][0][0] <<= 1;
393 s->mv[i][0][1] <<= 1;
398 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
399 s->mv_type = MV_TYPE_16X8;
401 if (USES_LIST(mb_type, i)) {
404 s->field_select[i][j] = get_bits1(&s->gb);
406 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
407 s->last_mv[i][j][k]);
408 s->last_mv[i][j][k] = val;
409 s->mv[i][j][k] = val;
417 s->mv_type = MV_TYPE_FIELD;
418 if (s->picture_structure == PICT_FRAME) {
419 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
421 if (USES_LIST(mb_type, i)) {
423 s->field_select[i][j] = get_bits1(&s->gb);
424 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
425 s->last_mv[i][j][0]);
426 s->last_mv[i][j][0] = val;
427 s->mv[i][j][0] = val;
428 dprintf(s->avctx, "fmx=%d\n", val);
429 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
430 s->last_mv[i][j][1] >> 1);
431 s->last_mv[i][j][1] = val << 1;
432 s->mv[i][j][1] = val;
433 dprintf(s->avctx, "fmy=%d\n", val);
438 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
440 if (USES_LIST(mb_type, i)) {
441 s->field_select[i][0] = get_bits1(&s->gb);
443 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
444 s->last_mv[i][0][k]);
445 s->last_mv[i][0][k] = val;
446 s->last_mv[i][1][k] = val;
447 s->mv[i][0][k] = val;
454 s->mv_type = MV_TYPE_DMV;
456 if (USES_LIST(mb_type, i)) {
457 int dmx, dmy, mx, my, m;
458 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
459 s->last_mv[i][0][0]);
460 s->last_mv[i][0][0] = mx;
461 s->last_mv[i][1][0] = mx;
463 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
464 s->last_mv[i][0][1] >> 1);
468 s->last_mv[i][0][1] = my<<1;
469 s->last_mv[i][1][1] = my<<1;
473 s->mv[i][1][0] = mx;//not used
474 s->mv[i][1][1] = my;//not used
476 if (s->picture_structure == PICT_FRAME) {
477 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
479 //m = 1 + 2 * s->top_field_first;
480 m = s->top_field_first ? 1 : 3;
482 /* top -> top pred */
483 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
484 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
486 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
487 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
489 mb_type |= MB_TYPE_16x16;
491 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
492 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
493 if(s->picture_structure == PICT_TOP_FIELD)
502 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
508 if (HAS_CBP(mb_type)) {
509 s->dsp.clear_blocks(s->block[0]);
511 cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
512 if(mb_block_count > 6){
513 cbp<<= mb_block_count-6;
514 cbp |= get_bits(&s->gb, mb_block_count-6);
515 s->dsp.clear_blocks(s->block[6]);
518 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
523 //if 1, we memcpy blocks in xvmcvideo
524 if(s->avctx->xvmc_acceleration > 1){
525 XVMC_pack_pblocks(s,cbp);
532 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
533 if(s->flags2 & CODEC_FLAG2_FAST){
536 mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
538 s->block_last_index[i] = -1;
543 cbp<<= 12-mb_block_count;
545 for(i=0;i<mb_block_count;i++) {
546 if ( cbp & (1<<11) ) {
547 if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
550 s->block_last_index[i] = -1;
556 if(s->flags2 & CODEC_FLAG2_FAST){
559 mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
561 s->block_last_index[i] = -1;
568 if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
571 s->block_last_index[i] = -1;
579 s->block_last_index[i] = -1;
583 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
588 /* as H.263, but only 17 codes */
589 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
591 int code, sign, val, l, shift;
593 code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
601 sign = get_bits1(&s->gb);
605 val = (val - 1) << shift;
606 val |= get_bits(&s->gb, shift);
613 /* modulo decoding */
614 l= INT_BIT - 5 - shift;
619 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
623 int level, dc, diff, i, j, run;
625 RLTable *rl = &ff_rl_mpeg1;
626 uint8_t * const scantable= s->intra_scantable.permutated;
627 const uint16_t *quant_matrix= s->intra_matrix;
628 const int qscale= s->qscale;
631 component = (n <= 3 ? 0 : n - 4 + 1);
632 diff = decode_dc(&s->gb, component);
635 dc = s->last_dc[component];
637 s->last_dc[component] = dc;
639 dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
642 OPEN_READER(re, &s->gb);
643 /* now quantify & encode AC coefficients */
645 UPDATE_CACHE(re, &s->gb);
646 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
650 } else if(level != 0) {
653 level= (level*qscale*quant_matrix[j])>>4;
655 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
656 LAST_SKIP_BITS(re, &s->gb, 1);
659 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
660 UPDATE_CACHE(re, &s->gb);
661 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
663 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
664 } else if (level == 0) {
665 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
671 level= (level*qscale*quant_matrix[j])>>4;
675 level= (level*qscale*quant_matrix[j])>>4;
680 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
686 CLOSE_READER(re, &s->gb);
688 s->block_last_index[n] = i;
692 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
696 int level, i, j, run;
697 RLTable *rl = &ff_rl_mpeg1;
698 uint8_t * const scantable= s->intra_scantable.permutated;
699 const uint16_t *quant_matrix= s->inter_matrix;
700 const int qscale= s->qscale;
703 OPEN_READER(re, &s->gb);
705 // special case for first coefficient, no need to add second VLC table
706 UPDATE_CACHE(re, &s->gb);
707 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
708 level= (3*qscale*quant_matrix[0])>>5;
710 if(GET_CACHE(re, &s->gb)&0x40000000)
714 SKIP_BITS(re, &s->gb, 2);
715 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
718 #if MIN_CACHE_BITS < 19
719 UPDATE_CACHE(re, &s->gb);
721 /* now quantify & encode AC coefficients */
723 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
728 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
730 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
731 SKIP_BITS(re, &s->gb, 1);
734 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
735 UPDATE_CACHE(re, &s->gb);
736 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
738 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
739 } else if (level == 0) {
740 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
746 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
750 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
755 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
760 #if MIN_CACHE_BITS < 19
761 UPDATE_CACHE(re, &s->gb);
763 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
765 #if MIN_CACHE_BITS >= 19
766 UPDATE_CACHE(re, &s->gb);
770 LAST_SKIP_BITS(re, &s->gb, 2);
771 CLOSE_READER(re, &s->gb);
773 s->block_last_index[n] = i;
777 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
779 int level, i, j, run;
780 RLTable *rl = &ff_rl_mpeg1;
781 uint8_t * const scantable= s->intra_scantable.permutated;
782 const int qscale= s->qscale;
785 OPEN_READER(re, &s->gb);
787 // special case for first coefficient, no need to add second VLC table
788 UPDATE_CACHE(re, &s->gb);
789 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
790 level= (3*qscale)>>1;
792 if(GET_CACHE(re, &s->gb)&0x40000000)
796 SKIP_BITS(re, &s->gb, 2);
797 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
800 #if MIN_CACHE_BITS < 19
801 UPDATE_CACHE(re, &s->gb);
804 /* now quantify & encode AC coefficients */
806 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
811 level= ((level*2+1)*qscale)>>1;
813 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
814 SKIP_BITS(re, &s->gb, 1);
817 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
818 UPDATE_CACHE(re, &s->gb);
819 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
821 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
822 } else if (level == 0) {
823 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
829 level= ((level*2+1)*qscale)>>1;
833 level= ((level*2+1)*qscale)>>1;
839 #if MIN_CACHE_BITS < 19
840 UPDATE_CACHE(re, &s->gb);
842 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
844 #if MIN_CACHE_BITS >= 19
845 UPDATE_CACHE(re, &s->gb);
849 LAST_SKIP_BITS(re, &s->gb, 2);
850 CLOSE_READER(re, &s->gb);
852 s->block_last_index[n] = i;
857 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
861 int level, i, j, run;
862 RLTable *rl = &ff_rl_mpeg1;
863 uint8_t * const scantable= s->intra_scantable.permutated;
864 const uint16_t *quant_matrix;
865 const int qscale= s->qscale;
871 OPEN_READER(re, &s->gb);
874 quant_matrix = s->inter_matrix;
876 quant_matrix = s->chroma_inter_matrix;
878 // special case for first coefficient, no need to add second VLC table
879 UPDATE_CACHE(re, &s->gb);
880 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
881 level= (3*qscale*quant_matrix[0])>>5;
882 if(GET_CACHE(re, &s->gb)&0x40000000)
887 SKIP_BITS(re, &s->gb, 2);
888 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
891 #if MIN_CACHE_BITS < 19
892 UPDATE_CACHE(re, &s->gb);
895 /* now quantify & encode AC coefficients */
897 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
902 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
903 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
904 SKIP_BITS(re, &s->gb, 1);
907 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
908 UPDATE_CACHE(re, &s->gb);
909 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
914 level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
917 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
921 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
927 #if MIN_CACHE_BITS < 19
928 UPDATE_CACHE(re, &s->gb);
930 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
932 #if MIN_CACHE_BITS >= 19
933 UPDATE_CACHE(re, &s->gb);
937 LAST_SKIP_BITS(re, &s->gb, 2);
938 CLOSE_READER(re, &s->gb);
940 block[63] ^= (mismatch & 1);
942 s->block_last_index[n] = i;
946 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
950 int level, i, j, run;
951 RLTable *rl = &ff_rl_mpeg1;
952 uint8_t * const scantable= s->intra_scantable.permutated;
953 const int qscale= s->qscale;
954 OPEN_READER(re, &s->gb);
957 // special case for first coefficient, no need to add second VLC table
958 UPDATE_CACHE(re, &s->gb);
959 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
960 level= (3*qscale)>>1;
961 if(GET_CACHE(re, &s->gb)&0x40000000)
965 SKIP_BITS(re, &s->gb, 2);
966 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
969 #if MIN_CACHE_BITS < 19
970 UPDATE_CACHE(re, &s->gb);
973 /* now quantify & encode AC coefficients */
975 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
980 level= ((level*2+1)*qscale)>>1;
981 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
982 SKIP_BITS(re, &s->gb, 1);
985 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
986 UPDATE_CACHE(re, &s->gb);
987 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
992 level= ((-level*2+1)*qscale)>>1;
995 level= ((level*2+1)*qscale)>>1;
1000 #if MIN_CACHE_BITS < 19
1001 UPDATE_CACHE(re, &s->gb);
1003 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1005 #if MIN_CACHE_BITS >=19
1006 UPDATE_CACHE(re, &s->gb);
1010 LAST_SKIP_BITS(re, &s->gb, 2);
1011 CLOSE_READER(re, &s->gb);
1012 s->block_last_index[n] = i;
1017 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1021 int level, dc, diff, i, j, run;
1024 uint8_t * const scantable= s->intra_scantable.permutated;
1025 const uint16_t *quant_matrix;
1026 const int qscale= s->qscale;
1029 /* DC coefficient */
1031 quant_matrix = s->intra_matrix;
1034 quant_matrix = s->chroma_intra_matrix;
1035 component = (n&1) + 1;
1037 diff = decode_dc(&s->gb, component);
1040 dc = s->last_dc[component];
1042 s->last_dc[component] = dc;
1043 block[0] = dc << (3 - s->intra_dc_precision);
1044 dprintf(s->avctx, "dc=%d\n", block[0]);
1045 mismatch = block[0] ^ 1;
1047 if (s->intra_vlc_format)
1053 OPEN_READER(re, &s->gb);
1054 /* now quantify & encode AC coefficients */
1056 UPDATE_CACHE(re, &s->gb);
1057 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1061 } else if(level != 0) {
1064 level= (level*qscale*quant_matrix[j])>>4;
1065 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1066 LAST_SKIP_BITS(re, &s->gb, 1);
1069 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1070 UPDATE_CACHE(re, &s->gb);
1071 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1075 level= (-level*qscale*quant_matrix[j])>>4;
1078 level= (level*qscale*quant_matrix[j])>>4;
1082 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1089 CLOSE_READER(re, &s->gb);
1091 block[63]^= mismatch&1;
1093 s->block_last_index[n] = i;
1097 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1101 int level, dc, diff, j, run;
1104 uint8_t * scantable= s->intra_scantable.permutated;
1105 const uint16_t *quant_matrix;
1106 const int qscale= s->qscale;
1108 /* DC coefficient */
1110 quant_matrix = s->intra_matrix;
1113 quant_matrix = s->chroma_intra_matrix;
1114 component = (n&1) + 1;
1116 diff = decode_dc(&s->gb, component);
1119 dc = s->last_dc[component];
1121 s->last_dc[component] = dc;
1122 block[0] = dc << (3 - s->intra_dc_precision);
1123 if (s->intra_vlc_format)
1129 OPEN_READER(re, &s->gb);
1130 /* now quantify & encode AC coefficients */
1132 UPDATE_CACHE(re, &s->gb);
1133 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1137 } else if(level != 0) {
1140 level= (level*qscale*quant_matrix[j])>>4;
1141 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1142 LAST_SKIP_BITS(re, &s->gb, 1);
1145 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1146 UPDATE_CACHE(re, &s->gb);
1147 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1151 level= (-level*qscale*quant_matrix[j])>>4;
1154 level= (level*qscale*quant_matrix[j])>>4;
1160 CLOSE_READER(re, &s->gb);
1163 s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1167 typedef struct Mpeg1Context {
1168 MpegEncContext mpeg_enc_ctx;
1169 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1170 int repeat_field; /* true if we must repeat the field */
1171 AVPanScan pan_scan; /** some temporary storage for the panscan */
1173 int swap_uv;//indicate VCR2
1174 int save_aspect_info;
1175 int save_width, save_height;
1176 AVRational frame_rate_ext; ///< MPEG-2 specific framerate modificator
1180 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1182 Mpeg1Context *s = avctx->priv_data;
1183 MpegEncContext *s2 = &s->mpeg_enc_ctx;
1186 /* we need some permutation to store matrices,
1187 * until MPV_common_init() sets the real permutation. */
1189 s2->dsp.idct_permutation[i]=i;
1191 MPV_decode_defaults(s2);
1193 s->mpeg_enc_ctx.avctx= avctx;
1194 s->mpeg_enc_ctx.flags= avctx->flags;
1195 s->mpeg_enc_ctx.flags2= avctx->flags2;
1196 ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1199 s->mpeg_enc_ctx_allocated = 0;
1200 s->mpeg_enc_ctx.picture_number = 0;
1201 s->repeat_field = 0;
1202 s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1206 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1207 const uint8_t *new_perm){
1208 uint16_t temp_matrix[64];
1211 memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1214 matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1218 /* Call this function when we know all parameters.
1219 * It may be called in different places for MPEG-1 and MPEG-2. */
1220 static int mpeg_decode_postinit(AVCodecContext *avctx){
1221 Mpeg1Context *s1 = avctx->priv_data;
1222 MpegEncContext *s = &s1->mpeg_enc_ctx;
1223 uint8_t old_permutation[64];
1226 (s1->mpeg_enc_ctx_allocated == 0)||
1227 avctx->coded_width != s->width ||
1228 avctx->coded_height != s->height||
1229 s1->save_width != s->width ||
1230 s1->save_height != s->height ||
1231 s1->save_aspect_info != s->aspect_ratio_info||
1235 if (s1->mpeg_enc_ctx_allocated) {
1236 ParseContext pc= s->parse_context;
1237 s->parse_context.buffer=0;
1239 s->parse_context= pc;
1242 if( (s->width == 0 )||(s->height == 0))
1245 avcodec_set_dimensions(avctx, s->width, s->height);
1246 avctx->bit_rate = s->bit_rate;
1247 s1->save_aspect_info = s->aspect_ratio_info;
1248 s1->save_width = s->width;
1249 s1->save_height = s->height;
1251 /* low_delay may be forced, in this case we will have B-frames
1252 * that behave like P-frames. */
1253 avctx->has_b_frames = !(s->low_delay);
1255 if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
1257 avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1258 avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1260 avctx->sample_aspect_ratio= av_d2q(
1261 1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1266 &s->avctx->time_base.den,
1267 &s->avctx->time_base.num,
1268 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1269 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1272 if(s->aspect_ratio_info > 1){
1273 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
1274 s->avctx->sample_aspect_ratio=
1276 ff_mpeg2_aspect[s->aspect_ratio_info],
1277 (AVRational){s->width, s->height}
1280 s->avctx->sample_aspect_ratio=
1282 ff_mpeg2_aspect[s->aspect_ratio_info],
1283 (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1287 s->avctx->sample_aspect_ratio=
1288 ff_mpeg2_aspect[s->aspect_ratio_info];
1292 if(avctx->xvmc_acceleration){
1293 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1295 if(s->chroma_format < 2){
1296 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
1298 if(s->chroma_format == 2){
1299 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
1301 if(s->chroma_format > 2){
1302 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
1305 //until then pix_fmt may be changed right after codec init
1306 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
1307 if( avctx->idct_algo == FF_IDCT_AUTO )
1308 avctx->idct_algo = FF_IDCT_SIMPLE;
1310 /* Quantization matrices may need reordering
1311 * if DCT permutation is changed. */
1312 memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1314 if (MPV_common_init(s) < 0)
1317 quant_matrix_rebuild(s->intra_matrix, old_permutation,s->dsp.idct_permutation);
1318 quant_matrix_rebuild(s->inter_matrix, old_permutation,s->dsp.idct_permutation);
1319 quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1320 quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1322 s1->mpeg_enc_ctx_allocated = 1;
1327 static int mpeg1_decode_picture(AVCodecContext *avctx,
1328 const uint8_t *buf, int buf_size)
1330 Mpeg1Context *s1 = avctx->priv_data;
1331 MpegEncContext *s = &s1->mpeg_enc_ctx;
1332 int ref, f_code, vbv_delay;
1334 if(mpeg_decode_postinit(s->avctx) < 0)
1337 init_get_bits(&s->gb, buf, buf_size*8);
1339 ref = get_bits(&s->gb, 10); /* temporal ref */
1340 s->pict_type = get_bits(&s->gb, 3);
1341 if(s->pict_type == 0 || s->pict_type > 3)
1344 vbv_delay= get_bits(&s->gb, 16);
1345 if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
1346 s->full_pel[0] = get_bits1(&s->gb);
1347 f_code = get_bits(&s->gb, 3);
1348 if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1350 s->mpeg_f_code[0][0] = f_code;
1351 s->mpeg_f_code[0][1] = f_code;
1353 if (s->pict_type == FF_B_TYPE) {
1354 s->full_pel[1] = get_bits1(&s->gb);
1355 f_code = get_bits(&s->gb, 3);
1356 if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1358 s->mpeg_f_code[1][0] = f_code;
1359 s->mpeg_f_code[1][1] = f_code;
1361 s->current_picture.pict_type= s->pict_type;
1362 s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1364 if(avctx->debug & FF_DEBUG_PICT_INFO)
1365 av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1373 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1375 MpegEncContext *s= &s1->mpeg_enc_ctx;
1376 int horiz_size_ext, vert_size_ext;
1379 skip_bits(&s->gb, 1); /* profile and level esc*/
1380 s->avctx->profile= get_bits(&s->gb, 3);
1381 s->avctx->level= get_bits(&s->gb, 4);
1382 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1383 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1384 horiz_size_ext = get_bits(&s->gb, 2);
1385 vert_size_ext = get_bits(&s->gb, 2);
1386 s->width |= (horiz_size_ext << 12);
1387 s->height |= (vert_size_ext << 12);
1388 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1389 s->bit_rate += (bit_rate_ext << 18) * 400;
1390 skip_bits1(&s->gb); /* marker */
1391 s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1393 s->low_delay = get_bits1(&s->gb);
1394 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1396 s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1397 s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1399 dprintf(s->avctx, "sequence extension\n");
1400 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1401 s->avctx->sub_id = 2; /* indicates MPEG-2 found */
1403 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1404 av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1405 s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1409 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1411 MpegEncContext *s= &s1->mpeg_enc_ctx;
1412 int color_description, w, h;
1414 skip_bits(&s->gb, 3); /* video format */
1415 color_description= get_bits1(&s->gb);
1416 if(color_description){
1417 skip_bits(&s->gb, 8); /* color primaries */
1418 skip_bits(&s->gb, 8); /* transfer_characteristics */
1419 skip_bits(&s->gb, 8); /* matrix_coefficients */
1421 w= get_bits(&s->gb, 14);
1422 skip_bits(&s->gb, 1); //marker
1423 h= get_bits(&s->gb, 14);
1424 skip_bits(&s->gb, 1); //marker
1426 s1->pan_scan.width= 16*w;
1427 s1->pan_scan.height=16*h;
1429 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1430 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1433 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1435 MpegEncContext *s= &s1->mpeg_enc_ctx;
1439 if(s->progressive_sequence){
1440 if(s->repeat_first_field){
1442 if(s->top_field_first)
1446 if(s->picture_structure == PICT_FRAME){
1448 if(s->repeat_first_field)
1452 for(i=0; i<nofco; i++){
1453 s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1454 skip_bits(&s->gb, 1); //marker
1455 s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1456 skip_bits(&s->gb, 1); //marker
1459 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1460 av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1461 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1462 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1463 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1467 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1471 dprintf(s->avctx, "matrix extension\n");
1473 if (get_bits1(&s->gb)) {
1475 v = get_bits(&s->gb, 8);
1476 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1477 s->intra_matrix[j] = v;
1478 s->chroma_intra_matrix[j] = v;
1481 if (get_bits1(&s->gb)) {
1483 v = get_bits(&s->gb, 8);
1484 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1485 s->inter_matrix[j] = v;
1486 s->chroma_inter_matrix[j] = v;
1489 if (get_bits1(&s->gb)) {
1491 v = get_bits(&s->gb, 8);
1492 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1493 s->chroma_intra_matrix[j] = v;
1496 if (get_bits1(&s->gb)) {
1498 v = get_bits(&s->gb, 8);
1499 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1500 s->chroma_inter_matrix[j] = v;
1505 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1507 s->full_pel[0] = s->full_pel[1] = 0;
1508 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1509 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1510 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1511 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1512 s->intra_dc_precision = get_bits(&s->gb, 2);
1513 s->picture_structure = get_bits(&s->gb, 2);
1514 s->top_field_first = get_bits1(&s->gb);
1515 s->frame_pred_frame_dct = get_bits1(&s->gb);
1516 s->concealment_motion_vectors = get_bits1(&s->gb);
1517 s->q_scale_type = get_bits1(&s->gb);
1518 s->intra_vlc_format = get_bits1(&s->gb);
1519 s->alternate_scan = get_bits1(&s->gb);
1520 s->repeat_first_field = get_bits1(&s->gb);
1521 s->chroma_420_type = get_bits1(&s->gb);
1522 s->progressive_frame = get_bits1(&s->gb);
1524 if(s->picture_structure == PICT_FRAME){
1526 s->v_edge_pos= 16*s->mb_height;
1528 s->first_field ^= 1;
1529 s->v_edge_pos= 8*s->mb_height;
1530 memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1533 if(s->alternate_scan){
1534 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
1535 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
1537 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
1538 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
1541 /* composite display not parsed */
1542 dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1543 dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1544 dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1545 dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1546 dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1547 dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1548 dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1549 dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1550 dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1553 static void mpeg_decode_extension(AVCodecContext *avctx,
1554 const uint8_t *buf, int buf_size)
1556 Mpeg1Context *s1 = avctx->priv_data;
1557 MpegEncContext *s = &s1->mpeg_enc_ctx;
1560 init_get_bits(&s->gb, buf, buf_size*8);
1562 ext_type = get_bits(&s->gb, 4);
1565 mpeg_decode_sequence_extension(s1);
1568 mpeg_decode_sequence_display_extension(s1);
1571 mpeg_decode_quant_matrix_extension(s);
1574 mpeg_decode_picture_display_extension(s1);
1577 mpeg_decode_picture_coding_extension(s);
1582 static void exchange_uv(MpegEncContext *s){
1583 short * tmp = s->pblocks[4];
1584 s->pblocks[4] = s->pblocks[5];
1585 s->pblocks[5] = tmp;
1588 static int mpeg_field_start(MpegEncContext *s){
1589 AVCodecContext *avctx= s->avctx;
1590 Mpeg1Context *s1 = (Mpeg1Context*)s;
1592 /* start frame decoding */
1593 if(s->first_field || s->picture_structure==PICT_FRAME){
1594 if(MPV_frame_start(s, avctx) < 0)
1597 ff_er_frame_start(s);
1599 /* first check if we must repeat the frame */
1600 s->current_picture_ptr->repeat_pict = 0;
1601 if (s->repeat_first_field) {
1602 if (s->progressive_sequence) {
1603 if (s->top_field_first)
1604 s->current_picture_ptr->repeat_pict = 4;
1606 s->current_picture_ptr->repeat_pict = 2;
1607 } else if (s->progressive_frame) {
1608 s->current_picture_ptr->repeat_pict = 1;
1612 *s->current_picture_ptr->pan_scan= s1->pan_scan;
1613 }else{ //second field
1616 if(!s->current_picture_ptr){
1617 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1622 s->current_picture.data[i] = s->current_picture_ptr->data[i];
1623 if(s->picture_structure == PICT_BOTTOM_FIELD){
1624 s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1629 // MPV_frame_start will call this function too,
1630 // but we need to call it on every field
1631 if(s->avctx->xvmc_acceleration)
1632 XVMC_field_start(s,avctx);
1638 #define DECODE_SLICE_ERROR -1
1639 #define DECODE_SLICE_OK 0
1642 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1643 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1644 * DECODE_SLICE_OK if this slice is ok<br>
1646 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1647 const uint8_t **buf, int buf_size)
1649 MpegEncContext *s = &s1->mpeg_enc_ctx;
1650 AVCodecContext *avctx= s->avctx;
1651 const int field_pic= s->picture_structure != PICT_FRAME;
1652 const int lowres= s->avctx->lowres;
1657 if (mb_y<<field_pic >= s->mb_height){
1658 av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
1662 init_get_bits(&s->gb, *buf, buf_size*8);
1664 ff_mpeg1_clean_buffers(s);
1665 s->interlaced_dct = 0;
1667 s->qscale = get_qscale(s);
1670 av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1674 /* extra slice info */
1675 while (get_bits1(&s->gb) != 0) {
1676 skip_bits(&s->gb, 8);
1682 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1684 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1691 /* otherwise, stuffing, nothing to do */
1697 if(s->mb_x >= (unsigned)s->mb_width){
1698 av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1702 s->resync_mb_x= s->mb_x;
1703 s->resync_mb_y= s->mb_y= mb_y;
1705 ff_init_block_index(s);
1707 if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1708 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1709 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",
1710 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],
1711 s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")),
1712 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1713 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1714 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1720 //If 1, we memcpy blocks in xvmcvideo.
1721 if(s->avctx->xvmc_acceleration > 1)
1722 XVMC_init_block(s);//set s->block
1725 if(mpeg_decode_mb(s, s->block) < 0)
1728 if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1729 const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
1730 int xy = s->mb_x*2 + s->mb_y*2*wrap;
1731 int motion_x, motion_y, dir, i;
1732 if(field_pic && !s->first_field)
1736 for(dir=0; dir<2; dir++){
1737 if (s->mb_intra || (dir==1 && s->pict_type != FF_B_TYPE)) {
1738 motion_x = motion_y = 0;
1739 }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1740 motion_x = s->mv[dir][0][0];
1741 motion_y = s->mv[dir][0][1];
1742 } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1743 motion_x = s->mv[dir][i][0];
1744 motion_y = s->mv[dir][i][1];
1747 s->current_picture.motion_val[dir][xy ][0] = motion_x;
1748 s->current_picture.motion_val[dir][xy ][1] = motion_y;
1749 s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1750 s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1751 s->current_picture.ref_index [dir][xy ]=
1752 s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
1753 assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1759 s->dest[0] += 16 >> lowres;
1760 s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1761 s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1763 MPV_decode_mb(s, s->block);
1765 if (++s->mb_x >= s->mb_width) {
1766 const int mb_size= 16>>s->avctx->lowres;
1768 ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
1773 if(s->mb_y<<field_pic >= s->mb_height){
1774 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
1775 int is_d10= s->chroma_format==2 && s->pict_type==FF_I_TYPE && avctx->profile==0 && avctx->level==5
1776 && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1777 && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1779 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1780 || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
1781 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1787 ff_init_block_index(s);
1790 /* skip mb handling */
1791 if (s->mb_skip_run == -1) {
1792 /* read increment again */
1795 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1797 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1802 s->mb_skip_run += 33;
1803 }else if(code == 35){
1804 if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1805 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1808 goto eos; /* end of slice */
1810 /* otherwise, stuffing, nothing to do */
1812 s->mb_skip_run += code;
1818 if(s->pict_type == FF_I_TYPE){
1819 av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1826 s->block_last_index[i] = -1;
1827 if(s->picture_structure == PICT_FRAME)
1828 s->mv_type = MV_TYPE_16X16;
1830 s->mv_type = MV_TYPE_FIELD;
1831 if (s->pict_type == FF_P_TYPE) {
1832 /* if P type, zero motion vector is implied */
1833 s->mv_dir = MV_DIR_FORWARD;
1834 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1835 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1836 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1837 s->field_select[0][0]= s->picture_structure - 1;
1839 /* if B type, reuse previous vectors and directions */
1840 s->mv[0][0][0] = s->last_mv[0][0][0];
1841 s->mv[0][0][1] = s->last_mv[0][0][1];
1842 s->mv[1][0][0] = s->last_mv[1][0][0];
1843 s->mv[1][0][1] = s->last_mv[1][0][1];
1848 eos: // end of slice
1849 *buf += (get_bits_count(&s->gb)-1)/8;
1850 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1854 static int slice_decode_thread(AVCodecContext *c, void *arg){
1855 MpegEncContext *s= arg;
1856 const uint8_t *buf= s->gb.buffer;
1857 int mb_y= s->start_mb_y;
1859 s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
1862 uint32_t start_code;
1865 ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1867 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1868 //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);
1870 if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1871 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);
1873 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);
1876 if(s->mb_y == s->end_mb_y)
1880 buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1881 mb_y= start_code - SLICE_MIN_START_CODE;
1882 if(mb_y < 0 || mb_y >= s->end_mb_y)
1886 return 0; //not reached
1890 * Handles slice ends.
1891 * @return 1 if it seems to be the last slice
1893 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1895 Mpeg1Context *s1 = avctx->priv_data;
1896 MpegEncContext *s = &s1->mpeg_enc_ctx;
1898 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1902 if(s->avctx->xvmc_acceleration)
1905 /* end of slice reached */
1906 if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1909 s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1915 if (s->pict_type == FF_B_TYPE || s->low_delay) {
1916 *pict= *(AVFrame*)s->current_picture_ptr;
1917 ff_print_debug_info(s, pict);
1919 s->picture_number++;
1920 /* latency of 1 frame for I- and P-frames */
1921 /* XXX: use another variable than picture_number */
1922 if (s->last_picture_ptr != NULL) {
1923 *pict= *(AVFrame*)s->last_picture_ptr;
1924 ff_print_debug_info(s, pict);
1934 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1935 const uint8_t *buf, int buf_size)
1937 Mpeg1Context *s1 = avctx->priv_data;
1938 MpegEncContext *s = &s1->mpeg_enc_ctx;
1942 init_get_bits(&s->gb, buf, buf_size*8);
1944 width = get_bits(&s->gb, 12);
1945 height = get_bits(&s->gb, 12);
1946 if (width <= 0 || height <= 0)
1948 s->aspect_ratio_info= get_bits(&s->gb, 4);
1949 if (s->aspect_ratio_info == 0) {
1950 av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1951 if (avctx->error_resilience >= FF_ER_COMPLIANT)
1954 s->frame_rate_index = get_bits(&s->gb, 4);
1955 if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1957 s->bit_rate = get_bits(&s->gb, 18) * 400;
1958 if (get_bits1(&s->gb) == 0) /* marker */
1963 s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
1964 skip_bits(&s->gb, 1);
1967 if (get_bits1(&s->gb)) {
1969 v = get_bits(&s->gb, 8);
1971 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
1974 j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1975 s->intra_matrix[j] = v;
1976 s->chroma_intra_matrix[j] = v;
1979 dprintf(s->avctx, "intra matrix present\n");
1981 dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
1982 dprintf(s->avctx, "\n");
1986 j = s->dsp.idct_permutation[i];
1987 v = ff_mpeg1_default_intra_matrix[i];
1988 s->intra_matrix[j] = v;
1989 s->chroma_intra_matrix[j] = v;
1992 if (get_bits1(&s->gb)) {
1994 v = get_bits(&s->gb, 8);
1996 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
1999 j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2000 s->inter_matrix[j] = v;
2001 s->chroma_inter_matrix[j] = v;
2004 dprintf(s->avctx, "non-intra matrix present\n");
2006 dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2007 dprintf(s->avctx, "\n");
2011 int j= s->dsp.idct_permutation[i];
2012 v = ff_mpeg1_default_non_intra_matrix[i];
2013 s->inter_matrix[j] = v;
2014 s->chroma_inter_matrix[j] = v;
2018 if(show_bits(&s->gb, 23) != 0){
2019 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2023 /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2024 s->progressive_sequence = 1;
2025 s->progressive_frame = 1;
2026 s->picture_structure = PICT_FRAME;
2027 s->frame_pred_frame_dct = 1;
2028 s->chroma_format = 1;
2029 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2030 avctx->sub_id = 1; /* indicates MPEG-1 */
2031 s->out_format = FMT_MPEG1;
2032 s->swap_uv = 0;//AFAIK VCR2 does not have SEQ_HEADER
2033 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2035 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2036 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2037 s->avctx->rc_buffer_size, s->bit_rate);
2042 static int vcr2_init_sequence(AVCodecContext *avctx)
2044 Mpeg1Context *s1 = avctx->priv_data;
2045 MpegEncContext *s = &s1->mpeg_enc_ctx;
2048 /* start new MPEG-1 context decoding */
2049 s->out_format = FMT_MPEG1;
2050 if (s1->mpeg_enc_ctx_allocated) {
2053 s->width = avctx->coded_width;
2054 s->height = avctx->coded_height;
2055 avctx->has_b_frames= 0; //true?
2058 if(avctx->xvmc_acceleration){
2059 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2061 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2064 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2065 if( avctx->idct_algo == FF_IDCT_AUTO )
2066 avctx->idct_algo = FF_IDCT_SIMPLE;
2068 if (MPV_common_init(s) < 0)
2070 exchange_uv(s);//common init reset pblocks, so we swap them here
2071 s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2072 s1->mpeg_enc_ctx_allocated = 1;
2075 int j= s->dsp.idct_permutation[i];
2076 v = ff_mpeg1_default_intra_matrix[i];
2077 s->intra_matrix[j] = v;
2078 s->chroma_intra_matrix[j] = v;
2080 v = ff_mpeg1_default_non_intra_matrix[i];
2081 s->inter_matrix[j] = v;
2082 s->chroma_inter_matrix[j] = v;
2085 s->progressive_sequence = 1;
2086 s->progressive_frame = 1;
2087 s->picture_structure = PICT_FRAME;
2088 s->frame_pred_frame_dct = 1;
2089 s->chroma_format = 1;
2090 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2091 avctx->sub_id = 2; /* indicates MPEG-2 */
2096 static void mpeg_decode_user_data(AVCodecContext *avctx,
2097 const uint8_t *buf, int buf_size)
2104 /* we parse the DTG active format information */
2106 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2120 avctx->dtg_active_format = p[0] & 0x0f;
2125 static void mpeg_decode_gop(AVCodecContext *avctx,
2126 const uint8_t *buf, int buf_size){
2127 Mpeg1Context *s1 = avctx->priv_data;
2128 MpegEncContext *s = &s1->mpeg_enc_ctx;
2130 int drop_frame_flag;
2131 int time_code_hours, time_code_minutes;
2132 int time_code_seconds, time_code_pictures;
2133 int closed_gop, broken_link;
2135 init_get_bits(&s->gb, buf, buf_size*8);
2137 drop_frame_flag = get_bits1(&s->gb);
2139 time_code_hours=get_bits(&s->gb,5);
2140 time_code_minutes = get_bits(&s->gb,6);
2141 skip_bits1(&s->gb);//marker bit
2142 time_code_seconds = get_bits(&s->gb,6);
2143 time_code_pictures = get_bits(&s->gb,6);
2145 closed_gop = get_bits1(&s->gb);
2146 /*broken_link indicate that after editing the
2147 reference frames of the first B-Frames after GOP I-Frame
2148 are missing (open gop)*/
2149 broken_link = get_bits1(&s->gb);
2151 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2152 av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2153 time_code_hours, time_code_minutes, time_code_seconds,
2154 time_code_pictures, closed_gop, broken_link);
2157 * Finds the end of the current frame in the bitstream.
2158 * @return the position of the first byte of the next frame, or -1
2160 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2163 uint32_t state= pc->state;
2165 /* EOF considered as end of frame */
2170 0 frame start -> 1/4
2171 1 first_SEQEXT -> 0/2
2172 2 first field start -> 3/0
2173 3 second_SEQEXT -> 2/0
2177 for(i=0; i<buf_size; i++){
2178 assert(pc->frame_start_found>=0 && pc->frame_start_found<=4);
2179 if(pc->frame_start_found&1){
2180 if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80)
2181 pc->frame_start_found--;
2182 else if(state == EXT_START_CODE+2){
2183 if((buf[i]&3) == 3) pc->frame_start_found= 0;
2184 else pc->frame_start_found= (pc->frame_start_found+1)&3;
2188 i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2189 if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2191 pc->frame_start_found=4;
2193 if(state == SEQ_END_CODE){
2197 if(pc->frame_start_found==2 && state == SEQ_START_CODE)
2198 pc->frame_start_found= 0;
2199 if(pc->frame_start_found<4 && state == EXT_START_CODE)
2200 pc->frame_start_found++;
2201 if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){
2202 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2203 pc->frame_start_found=0;
2211 return END_NOT_FOUND;
2214 static int decode_chunks(AVCodecContext *avctx,
2215 AVFrame *picture, int *data_size,
2216 const uint8_t *buf, int buf_size);
2218 /* handle buffering and image synchronisation */
2219 static int mpeg_decode_frame(AVCodecContext *avctx,
2220 void *data, int *data_size,
2221 const uint8_t *buf, int buf_size)
2223 Mpeg1Context *s = avctx->priv_data;
2224 AVFrame *picture = data;
2225 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2226 dprintf(avctx, "fill_buffer\n");
2228 if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2229 /* special case for last picture */
2230 if (s2->low_delay==0 && s2->next_picture_ptr) {
2231 *picture= *(AVFrame*)s2->next_picture_ptr;
2232 s2->next_picture_ptr= NULL;
2234 *data_size = sizeof(AVFrame);
2239 if(s2->flags&CODEC_FLAG_TRUNCATED){
2240 int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
2242 if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2247 if (s->repeat_field % 2 == 1) {
2249 //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2250 // s2->picture_number, s->repeat_field);
2251 if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2252 *data_size = sizeof(AVPicture);
2258 if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2259 vcr2_init_sequence(avctx);
2263 if(avctx->extradata && !avctx->frame_number)
2264 decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2266 return decode_chunks(avctx, picture, data_size, buf, buf_size);
2269 static int decode_chunks(AVCodecContext *avctx,
2270 AVFrame *picture, int *data_size,
2271 const uint8_t *buf, int buf_size)
2273 Mpeg1Context *s = avctx->priv_data;
2274 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2275 const uint8_t *buf_ptr = buf;
2276 const uint8_t *buf_end = buf + buf_size;
2277 int ret, input_size;
2280 /* find next start code */
2281 uint32_t start_code = -1;
2282 buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2283 if (start_code > 0x1ff){
2284 if(s2->pict_type != FF_B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2285 if(avctx->thread_count > 1){
2288 avctx->execute(avctx, slice_decode_thread, (void**)&(s2->thread_context[0]), NULL, s->slice_count);
2289 for(i=0; i<s->slice_count; i++)
2290 s2->error_count += s2->thread_context[i]->error_count;
2292 if (slice_end(avctx, picture)) {
2293 if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2294 *data_size = sizeof(AVPicture);
2297 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2300 input_size = buf_end - buf_ptr;
2302 if(avctx->debug & FF_DEBUG_STARTCODE){
2303 av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2306 /* prepare data for next start code */
2307 switch(start_code) {
2308 case SEQ_START_CODE:
2309 mpeg1_decode_sequence(avctx, buf_ptr,
2313 case PICTURE_START_CODE:
2314 /* we have a complete image: we try to decompress it */
2315 mpeg1_decode_picture(avctx,
2316 buf_ptr, input_size);
2318 case EXT_START_CODE:
2319 mpeg_decode_extension(avctx,
2320 buf_ptr, input_size);
2322 case USER_START_CODE:
2323 mpeg_decode_user_data(avctx,
2324 buf_ptr, input_size);
2326 case GOP_START_CODE:
2328 mpeg_decode_gop(avctx,
2329 buf_ptr, input_size);
2332 if (start_code >= SLICE_MIN_START_CODE &&
2333 start_code <= SLICE_MAX_START_CODE) {
2334 int mb_y= start_code - SLICE_MIN_START_CODE;
2336 if(s2->last_picture_ptr==NULL){
2337 /* Skip B-frames if we do not have reference frames. */
2338 if(s2->pict_type==FF_B_TYPE) break;
2340 if(s2->next_picture_ptr==NULL){
2341 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2342 if(s2->pict_type==FF_P_TYPE && (s2->first_field || s2->picture_structure==PICT_FRAME)) break;
2344 /* Skip B-frames if we are in a hurry. */
2345 if(avctx->hurry_up && s2->pict_type==FF_B_TYPE) break;
2346 if( (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==FF_B_TYPE)
2347 ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=FF_I_TYPE)
2348 || avctx->skip_frame >= AVDISCARD_ALL)
2350 /* Skip everything if we are in a hurry>=5. */
2351 if(avctx->hurry_up>=5) break;
2353 if (!s->mpeg_enc_ctx_allocated) break;
2355 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2356 if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2360 if(s2->first_slice){
2362 if(mpeg_field_start(s2) < 0)
2365 if(!s2->current_picture_ptr){
2366 av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2370 if(avctx->thread_count > 1){
2371 int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2372 if(threshold <= mb_y){
2373 MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2375 thread_context->start_mb_y= mb_y;
2376 thread_context->end_mb_y = s2->mb_height;
2378 s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2379 ff_update_duplicate_context(thread_context, s2);
2381 init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2384 buf_ptr += 2; //FIXME add minimum number of bytes per slice
2386 ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2390 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2391 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);
2393 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);
2402 static int mpeg_decode_end(AVCodecContext *avctx)
2404 Mpeg1Context *s = avctx->priv_data;
2406 if (s->mpeg_enc_ctx_allocated)
2407 MPV_common_end(&s->mpeg_enc_ctx);
2411 AVCodec mpeg1video_decoder = {
2414 CODEC_ID_MPEG1VIDEO,
2415 sizeof(Mpeg1Context),
2420 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2421 .flush= ff_mpeg_flush,
2422 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2425 AVCodec mpeg2video_decoder = {
2428 CODEC_ID_MPEG2VIDEO,
2429 sizeof(Mpeg1Context),
2434 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2435 .flush= ff_mpeg_flush,
2436 .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2440 AVCodec mpegvideo_decoder = {
2443 CODEC_ID_MPEG2VIDEO,
2444 sizeof(Mpeg1Context),
2449 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2450 .flush= ff_mpeg_flush,
2451 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2455 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx){
2458 if( avctx->thread_count > 1)
2460 if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2462 if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2463 dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2465 mpeg_decode_init(avctx);
2466 s = avctx->priv_data;
2468 avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2469 avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2474 AVCodec mpeg_xvmc_decoder = {
2477 CODEC_ID_MPEG2VIDEO_XVMC,
2478 sizeof(Mpeg1Context),
2479 mpeg_mc_decode_init,
2483 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2484 .flush= ff_mpeg_flush,
2485 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video XvMC (X-Video Motion Compensation)"),