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
24 * @file libavcodec/mpeg12.c
32 #include "mpegvideo.h"
35 #include "mpeg12data.h"
36 #include "mpeg12decdata.h"
37 #include "bytestream.h"
38 #include "vdpau_internal.h"
39 #include "xvmc_internal.h"
46 #define MBINCR_VLC_BITS 9
47 #define MB_PAT_VLC_BITS 9
48 #define MB_PTYPE_VLC_BITS 6
49 #define MB_BTYPE_VLC_BITS 6
51 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
54 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
57 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
58 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
61 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
64 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
65 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
66 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
67 static void exchange_uv(MpegEncContext *s);
69 static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
70 PIX_FMT_XVMC_MPEG2_IDCT,
71 PIX_FMT_XVMC_MPEG2_MC,
74 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
77 #define INIT_2D_VLC_RL(rl, static_size)\
79 static RL_VLC_ELEM rl_vlc_table[static_size];\
80 INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
81 &rl.table_vlc[0][1], 4, 2,\
82 &rl.table_vlc[0][0], 4, 2, static_size);\
84 rl.rl_vlc[0]= rl_vlc_table;\
88 static void init_2d_vlc_rl(RLTable *rl)
92 for(i=0; i<rl->vlc.table_size; i++){
93 int code= rl->vlc.table[i][0];
94 int len = rl->vlc.table[i][1];
97 if(len==0){ // illegal code
100 }else if(len<0){ //more bits needed
104 if(code==rl->n){ //esc
107 }else if(code==rl->n+1){ //eob
111 run= rl->table_run [code] + 1;
112 level= rl->table_level[code];
115 rl->rl_vlc[0][i].len= len;
116 rl->rl_vlc[0][i].level= level;
117 rl->rl_vlc[0][i].run= run;
121 void ff_mpeg12_common_init(MpegEncContext *s)
125 s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
129 void ff_mpeg1_clean_buffers(MpegEncContext *s){
130 s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
131 s->last_dc[1] = s->last_dc[0];
132 s->last_dc[2] = s->last_dc[0];
133 memset(s->last_mv, 0, sizeof(s->last_mv));
137 /******************************************/
141 static VLC mbincr_vlc;
142 static VLC mb_ptype_vlc;
143 static VLC mb_btype_vlc;
144 static VLC mb_pat_vlc;
146 av_cold void ff_mpeg12_init_vlcs(void)
153 INIT_VLC_STATIC(&dc_lum_vlc, DC_VLC_BITS, 12,
154 ff_mpeg12_vlc_dc_lum_bits, 1, 1,
155 ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
156 INIT_VLC_STATIC(&dc_chroma_vlc, DC_VLC_BITS, 12,
157 ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
158 ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
159 INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
160 &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
161 &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
162 INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
163 &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
164 &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
165 INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
166 &ff_mpeg12_mbPatTable[0][1], 2, 1,
167 &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
169 INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
170 &table_mb_ptype[0][1], 2, 1,
171 &table_mb_ptype[0][0], 2, 1, 64);
172 INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
173 &table_mb_btype[0][1], 2, 1,
174 &table_mb_btype[0][0], 2, 1, 64);
175 init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
176 init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
178 INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
179 INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
183 static inline int get_dmv(MpegEncContext *s)
185 if(get_bits1(&s->gb))
186 return 1 - (get_bits1(&s->gb) << 1);
191 static inline int get_qscale(MpegEncContext *s)
193 int qscale = get_bits(&s->gb, 5);
194 if (s->q_scale_type) {
195 return non_linear_qscale[qscale];
201 /* motion type (for MPEG-2) */
207 static int mpeg_decode_mb(MpegEncContext *s,
208 DCTELEM block[12][64])
210 int i, j, k, cbp, val, mb_type, motion_type;
211 const int mb_block_count = 4 + (1<< s->chroma_format);
213 dprintf(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
215 assert(s->mb_skipped==0);
217 if (s->mb_skip_run-- != 0) {
218 if (s->pict_type == FF_P_TYPE) {
220 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
225 mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
227 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
228 if(IS_INTRA(mb_type))
231 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
232 mb_type | MB_TYPE_SKIP;
233 // assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
235 if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
242 switch(s->pict_type) {
245 if (get_bits1(&s->gb) == 0) {
246 if (get_bits1(&s->gb) == 0){
247 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
250 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
252 mb_type = MB_TYPE_INTRA;
256 mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
258 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
261 mb_type = ptype2mb_type[ mb_type ];
264 mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
266 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
269 mb_type = btype2mb_type[ mb_type ];
272 dprintf(s->avctx, "mb_type=%x\n", mb_type);
273 // motion_type = 0; /* avoid warning */
274 if (IS_INTRA(mb_type)) {
275 s->dsp.clear_blocks(s->block[0]);
277 if(!s->chroma_y_shift){
278 s->dsp.clear_blocks(s->block[6]);
281 /* compute DCT type */
282 if (s->picture_structure == PICT_FRAME && //FIXME add an interlaced_dct coded var?
283 !s->frame_pred_frame_dct) {
284 s->interlaced_dct = get_bits1(&s->gb);
287 if (IS_QUANT(mb_type))
288 s->qscale = get_qscale(s);
290 if (s->concealment_motion_vectors) {
291 /* just parse them */
292 if (s->picture_structure != PICT_FRAME)
293 skip_bits1(&s->gb); /* field select */
295 s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
296 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
297 s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
298 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
300 skip_bits1(&s->gb); /* marker */
302 memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
304 //if 1, we memcpy blocks in xvmcvideo
305 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
306 ff_xvmc_pack_pblocks(s,-1);//inter are always full blocks
312 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
313 if(s->flags2 & CODEC_FLAG2_FAST){
315 mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
318 for(i=0;i<mb_block_count;i++) {
319 if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
325 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
330 if (mb_type & MB_TYPE_ZERO_MV){
331 assert(mb_type & MB_TYPE_CBP);
333 s->mv_dir = MV_DIR_FORWARD;
334 if(s->picture_structure == PICT_FRAME){
335 if(!s->frame_pred_frame_dct)
336 s->interlaced_dct = get_bits1(&s->gb);
337 s->mv_type = MV_TYPE_16X16;
339 s->mv_type = MV_TYPE_FIELD;
340 mb_type |= MB_TYPE_INTERLACED;
341 s->field_select[0][0]= s->picture_structure - 1;
344 if (IS_QUANT(mb_type))
345 s->qscale = get_qscale(s);
347 s->last_mv[0][0][0] = 0;
348 s->last_mv[0][0][1] = 0;
349 s->last_mv[0][1][0] = 0;
350 s->last_mv[0][1][1] = 0;
354 assert(mb_type & MB_TYPE_L0L1);
355 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
356 /* get additional motion vector type */
357 if (s->frame_pred_frame_dct)
358 motion_type = MT_FRAME;
360 motion_type = get_bits(&s->gb, 2);
361 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
362 s->interlaced_dct = get_bits1(&s->gb);
365 if (IS_QUANT(mb_type))
366 s->qscale = get_qscale(s);
369 s->mv_dir= (mb_type>>13)&3;
370 dprintf(s->avctx, "motion_type=%d\n", motion_type);
371 switch(motion_type) {
372 case MT_FRAME: /* or MT_16X8 */
373 if (s->picture_structure == PICT_FRAME) {
374 mb_type |= MB_TYPE_16x16;
375 s->mv_type = MV_TYPE_16X16;
377 if (USES_LIST(mb_type, i)) {
379 s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
380 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
381 s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
382 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
383 /* full_pel: only for MPEG-1 */
385 s->mv[i][0][0] <<= 1;
386 s->mv[i][0][1] <<= 1;
391 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
392 s->mv_type = MV_TYPE_16X8;
394 if (USES_LIST(mb_type, i)) {
397 s->field_select[i][j] = get_bits1(&s->gb);
399 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
400 s->last_mv[i][j][k]);
401 s->last_mv[i][j][k] = val;
402 s->mv[i][j][k] = val;
410 s->mv_type = MV_TYPE_FIELD;
411 if (s->picture_structure == PICT_FRAME) {
412 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
414 if (USES_LIST(mb_type, i)) {
416 s->field_select[i][j] = get_bits1(&s->gb);
417 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
418 s->last_mv[i][j][0]);
419 s->last_mv[i][j][0] = val;
420 s->mv[i][j][0] = val;
421 dprintf(s->avctx, "fmx=%d\n", val);
422 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
423 s->last_mv[i][j][1] >> 1);
424 s->last_mv[i][j][1] = val << 1;
425 s->mv[i][j][1] = val;
426 dprintf(s->avctx, "fmy=%d\n", val);
431 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
433 if (USES_LIST(mb_type, i)) {
434 s->field_select[i][0] = get_bits1(&s->gb);
436 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
437 s->last_mv[i][0][k]);
438 s->last_mv[i][0][k] = val;
439 s->last_mv[i][1][k] = val;
440 s->mv[i][0][k] = val;
447 s->mv_type = MV_TYPE_DMV;
449 if (USES_LIST(mb_type, i)) {
450 int dmx, dmy, mx, my, m;
451 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
452 s->last_mv[i][0][0]);
453 s->last_mv[i][0][0] = mx;
454 s->last_mv[i][1][0] = mx;
456 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
457 s->last_mv[i][0][1] >> 1);
461 s->last_mv[i][0][1] = my<<1;
462 s->last_mv[i][1][1] = my<<1;
466 s->mv[i][1][0] = mx;//not used
467 s->mv[i][1][1] = my;//not used
469 if (s->picture_structure == PICT_FRAME) {
470 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
472 //m = 1 + 2 * s->top_field_first;
473 m = s->top_field_first ? 1 : 3;
475 /* top -> top pred */
476 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
477 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
479 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
480 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
482 mb_type |= MB_TYPE_16x16;
484 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
485 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
486 if(s->picture_structure == PICT_TOP_FIELD)
495 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
501 if (HAS_CBP(mb_type)) {
502 s->dsp.clear_blocks(s->block[0]);
504 cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
505 if(mb_block_count > 6){
506 cbp<<= mb_block_count-6;
507 cbp |= get_bits(&s->gb, mb_block_count-6);
508 s->dsp.clear_blocks(s->block[6]);
511 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
515 //if 1, we memcpy blocks in xvmcvideo
516 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
517 ff_xvmc_pack_pblocks(s,cbp);
523 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
524 if(s->flags2 & CODEC_FLAG2_FAST){
527 mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
529 s->block_last_index[i] = -1;
534 cbp<<= 12-mb_block_count;
536 for(i=0;i<mb_block_count;i++) {
537 if ( cbp & (1<<11) ) {
538 if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
541 s->block_last_index[i] = -1;
547 if(s->flags2 & CODEC_FLAG2_FAST){
550 mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
552 s->block_last_index[i] = -1;
559 if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
562 s->block_last_index[i] = -1;
570 s->block_last_index[i] = -1;
574 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
579 /* as H.263, but only 17 codes */
580 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
582 int code, sign, val, l, shift;
584 code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
592 sign = get_bits1(&s->gb);
596 val = (val - 1) << shift;
597 val |= get_bits(&s->gb, shift);
604 /* modulo decoding */
605 l= INT_BIT - 5 - shift;
610 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
614 int level, dc, diff, i, j, run;
616 RLTable *rl = &ff_rl_mpeg1;
617 uint8_t * const scantable= s->intra_scantable.permutated;
618 const uint16_t *quant_matrix= s->intra_matrix;
619 const int qscale= s->qscale;
622 component = (n <= 3 ? 0 : n - 4 + 1);
623 diff = decode_dc(&s->gb, component);
626 dc = s->last_dc[component];
628 s->last_dc[component] = dc;
629 block[0] = dc*quant_matrix[0];
630 dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
633 OPEN_READER(re, &s->gb);
634 /* now quantify & encode AC coefficients */
636 UPDATE_CACHE(re, &s->gb);
637 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
641 } else if(level != 0) {
644 level= (level*qscale*quant_matrix[j])>>4;
646 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
647 LAST_SKIP_BITS(re, &s->gb, 1);
650 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
651 UPDATE_CACHE(re, &s->gb);
652 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
654 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
655 } else if (level == 0) {
656 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
662 level= (level*qscale*quant_matrix[j])>>4;
666 level= (level*qscale*quant_matrix[j])>>4;
671 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
677 CLOSE_READER(re, &s->gb);
679 s->block_last_index[n] = i;
683 int ff_mpeg1_decode_block_intra(MpegEncContext *s,
687 return mpeg1_decode_block_intra(s, block, n);
690 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
694 int level, i, j, run;
695 RLTable *rl = &ff_rl_mpeg1;
696 uint8_t * const scantable= s->intra_scantable.permutated;
697 const uint16_t *quant_matrix= s->inter_matrix;
698 const int qscale= s->qscale;
701 OPEN_READER(re, &s->gb);
703 // special case for first coefficient, no need to add second VLC table
704 UPDATE_CACHE(re, &s->gb);
705 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
706 level= (3*qscale*quant_matrix[0])>>5;
708 if(GET_CACHE(re, &s->gb)&0x40000000)
712 SKIP_BITS(re, &s->gb, 2);
713 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
716 #if MIN_CACHE_BITS < 19
717 UPDATE_CACHE(re, &s->gb);
719 /* now quantify & encode AC coefficients */
721 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
726 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
728 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
729 SKIP_BITS(re, &s->gb, 1);
732 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
733 UPDATE_CACHE(re, &s->gb);
734 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
736 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
737 } else if (level == 0) {
738 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
744 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
748 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
753 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
758 #if MIN_CACHE_BITS < 19
759 UPDATE_CACHE(re, &s->gb);
761 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
763 #if MIN_CACHE_BITS >= 19
764 UPDATE_CACHE(re, &s->gb);
768 LAST_SKIP_BITS(re, &s->gb, 2);
769 CLOSE_READER(re, &s->gb);
771 s->block_last_index[n] = i;
775 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
777 int level, i, j, run;
778 RLTable *rl = &ff_rl_mpeg1;
779 uint8_t * const scantable= s->intra_scantable.permutated;
780 const int qscale= s->qscale;
783 OPEN_READER(re, &s->gb);
785 // special case for first coefficient, no need to add second VLC table
786 UPDATE_CACHE(re, &s->gb);
787 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
788 level= (3*qscale)>>1;
790 if(GET_CACHE(re, &s->gb)&0x40000000)
794 SKIP_BITS(re, &s->gb, 2);
795 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
798 #if MIN_CACHE_BITS < 19
799 UPDATE_CACHE(re, &s->gb);
802 /* now quantify & encode AC coefficients */
804 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
809 level= ((level*2+1)*qscale)>>1;
811 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
812 SKIP_BITS(re, &s->gb, 1);
815 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
816 UPDATE_CACHE(re, &s->gb);
817 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
819 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
820 } else if (level == 0) {
821 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
827 level= ((level*2+1)*qscale)>>1;
831 level= ((level*2+1)*qscale)>>1;
837 #if MIN_CACHE_BITS < 19
838 UPDATE_CACHE(re, &s->gb);
840 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
842 #if MIN_CACHE_BITS >= 19
843 UPDATE_CACHE(re, &s->gb);
847 LAST_SKIP_BITS(re, &s->gb, 2);
848 CLOSE_READER(re, &s->gb);
850 s->block_last_index[n] = i;
855 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
859 int level, i, j, run;
860 RLTable *rl = &ff_rl_mpeg1;
861 uint8_t * const scantable= s->intra_scantable.permutated;
862 const uint16_t *quant_matrix;
863 const int qscale= s->qscale;
869 OPEN_READER(re, &s->gb);
872 quant_matrix = s->inter_matrix;
874 quant_matrix = s->chroma_inter_matrix;
876 // special case for first coefficient, no need to add second VLC table
877 UPDATE_CACHE(re, &s->gb);
878 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
879 level= (3*qscale*quant_matrix[0])>>5;
880 if(GET_CACHE(re, &s->gb)&0x40000000)
885 SKIP_BITS(re, &s->gb, 2);
886 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
889 #if MIN_CACHE_BITS < 19
890 UPDATE_CACHE(re, &s->gb);
893 /* now quantify & encode AC coefficients */
895 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
900 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
901 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
902 SKIP_BITS(re, &s->gb, 1);
905 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
906 UPDATE_CACHE(re, &s->gb);
907 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
912 level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
915 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
919 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
925 #if MIN_CACHE_BITS < 19
926 UPDATE_CACHE(re, &s->gb);
928 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
930 #if MIN_CACHE_BITS >= 19
931 UPDATE_CACHE(re, &s->gb);
935 LAST_SKIP_BITS(re, &s->gb, 2);
936 CLOSE_READER(re, &s->gb);
938 block[63] ^= (mismatch & 1);
940 s->block_last_index[n] = i;
944 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
948 int level, i, j, run;
949 RLTable *rl = &ff_rl_mpeg1;
950 uint8_t * const scantable= s->intra_scantable.permutated;
951 const int qscale= s->qscale;
952 OPEN_READER(re, &s->gb);
955 // special case for first coefficient, no need to add second VLC table
956 UPDATE_CACHE(re, &s->gb);
957 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
958 level= (3*qscale)>>1;
959 if(GET_CACHE(re, &s->gb)&0x40000000)
963 SKIP_BITS(re, &s->gb, 2);
964 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
967 #if MIN_CACHE_BITS < 19
968 UPDATE_CACHE(re, &s->gb);
971 /* now quantify & encode AC coefficients */
973 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
978 level= ((level*2+1)*qscale)>>1;
979 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
980 SKIP_BITS(re, &s->gb, 1);
983 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
984 UPDATE_CACHE(re, &s->gb);
985 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
990 level= ((-level*2+1)*qscale)>>1;
993 level= ((level*2+1)*qscale)>>1;
998 #if MIN_CACHE_BITS < 19
999 UPDATE_CACHE(re, &s->gb);
1001 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1003 #if MIN_CACHE_BITS >=19
1004 UPDATE_CACHE(re, &s->gb);
1008 LAST_SKIP_BITS(re, &s->gb, 2);
1009 CLOSE_READER(re, &s->gb);
1010 s->block_last_index[n] = i;
1015 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1019 int level, dc, diff, i, j, run;
1022 uint8_t * const scantable= s->intra_scantable.permutated;
1023 const uint16_t *quant_matrix;
1024 const int qscale= s->qscale;
1027 /* DC coefficient */
1029 quant_matrix = s->intra_matrix;
1032 quant_matrix = s->chroma_intra_matrix;
1033 component = (n&1) + 1;
1035 diff = decode_dc(&s->gb, component);
1038 dc = s->last_dc[component];
1040 s->last_dc[component] = dc;
1041 block[0] = dc << (3 - s->intra_dc_precision);
1042 dprintf(s->avctx, "dc=%d\n", block[0]);
1043 mismatch = block[0] ^ 1;
1045 if (s->intra_vlc_format)
1051 OPEN_READER(re, &s->gb);
1052 /* now quantify & encode AC coefficients */
1054 UPDATE_CACHE(re, &s->gb);
1055 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1059 } else if(level != 0) {
1062 level= (level*qscale*quant_matrix[j])>>4;
1063 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1064 LAST_SKIP_BITS(re, &s->gb, 1);
1067 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1068 UPDATE_CACHE(re, &s->gb);
1069 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1073 level= (-level*qscale*quant_matrix[j])>>4;
1076 level= (level*qscale*quant_matrix[j])>>4;
1080 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1087 CLOSE_READER(re, &s->gb);
1089 block[63]^= mismatch&1;
1091 s->block_last_index[n] = i;
1095 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1099 int level, dc, diff, j, run;
1102 uint8_t * scantable= s->intra_scantable.permutated;
1103 const uint16_t *quant_matrix;
1104 const int qscale= s->qscale;
1106 /* DC coefficient */
1108 quant_matrix = s->intra_matrix;
1111 quant_matrix = s->chroma_intra_matrix;
1112 component = (n&1) + 1;
1114 diff = decode_dc(&s->gb, component);
1117 dc = s->last_dc[component];
1119 s->last_dc[component] = dc;
1120 block[0] = dc << (3 - s->intra_dc_precision);
1121 if (s->intra_vlc_format)
1127 OPEN_READER(re, &s->gb);
1128 /* now quantify & encode AC coefficients */
1130 UPDATE_CACHE(re, &s->gb);
1131 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1135 } else if(level != 0) {
1138 level= (level*qscale*quant_matrix[j])>>4;
1139 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1140 LAST_SKIP_BITS(re, &s->gb, 1);
1143 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1144 UPDATE_CACHE(re, &s->gb);
1145 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1149 level= (-level*qscale*quant_matrix[j])>>4;
1152 level= (level*qscale*quant_matrix[j])>>4;
1158 CLOSE_READER(re, &s->gb);
1161 s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1165 typedef struct Mpeg1Context {
1166 MpegEncContext mpeg_enc_ctx;
1167 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1168 int repeat_field; /* true if we must repeat the field */
1169 AVPanScan pan_scan; /** some temporary storage for the panscan */
1171 int swap_uv;//indicate VCR2
1172 int save_aspect_info;
1173 int save_width, save_height, save_progressive_seq;
1174 AVRational frame_rate_ext; ///< MPEG-2 specific framerate modificator
1178 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1180 Mpeg1Context *s = avctx->priv_data;
1181 MpegEncContext *s2 = &s->mpeg_enc_ctx;
1184 /* we need some permutation to store matrices,
1185 * until MPV_common_init() sets the real permutation. */
1187 s2->dsp.idct_permutation[i]=i;
1189 MPV_decode_defaults(s2);
1191 s->mpeg_enc_ctx.avctx= avctx;
1192 s->mpeg_enc_ctx.flags= avctx->flags;
1193 s->mpeg_enc_ctx.flags2= avctx->flags2;
1194 ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1195 ff_mpeg12_init_vlcs();
1197 s->mpeg_enc_ctx_allocated = 0;
1198 s->mpeg_enc_ctx.picture_number = 0;
1199 s->repeat_field = 0;
1200 s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1201 avctx->color_range= AVCOL_RANGE_MPEG;
1202 if (avctx->codec->id == CODEC_ID_MPEG1VIDEO)
1203 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1205 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1209 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1210 const uint8_t *new_perm){
1211 uint16_t temp_matrix[64];
1214 memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1217 matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1221 static enum PixelFormat mpeg_get_pixelformat(AVCodecContext *avctx){
1222 Mpeg1Context *s1 = avctx->priv_data;
1223 MpegEncContext *s = &s1->mpeg_enc_ctx;
1225 if(avctx->xvmc_acceleration)
1226 return avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1227 else if(avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU){
1228 if(avctx->codec_id == CODEC_ID_MPEG1VIDEO)
1229 return PIX_FMT_VDPAU_MPEG1;
1231 return PIX_FMT_VDPAU_MPEG2;
1233 if(s->chroma_format < 2)
1234 return avctx->get_format(avctx,ff_hwaccel_pixfmt_list_420);
1235 else if(s->chroma_format == 2)
1236 return PIX_FMT_YUV422P;
1238 return PIX_FMT_YUV444P;
1242 /* Call this function when we know all parameters.
1243 * It may be called in different places for MPEG-1 and MPEG-2. */
1244 static int mpeg_decode_postinit(AVCodecContext *avctx){
1245 Mpeg1Context *s1 = avctx->priv_data;
1246 MpegEncContext *s = &s1->mpeg_enc_ctx;
1247 uint8_t old_permutation[64];
1250 (s1->mpeg_enc_ctx_allocated == 0)||
1251 avctx->coded_width != s->width ||
1252 avctx->coded_height != s->height||
1253 s1->save_width != s->width ||
1254 s1->save_height != s->height ||
1255 s1->save_aspect_info != s->aspect_ratio_info||
1256 s1->save_progressive_seq != s->progressive_sequence ||
1260 if (s1->mpeg_enc_ctx_allocated) {
1261 ParseContext pc= s->parse_context;
1262 s->parse_context.buffer=0;
1264 s->parse_context= pc;
1267 if( (s->width == 0 )||(s->height == 0))
1270 avcodec_set_dimensions(avctx, s->width, s->height);
1271 avctx->bit_rate = s->bit_rate;
1272 s1->save_aspect_info = s->aspect_ratio_info;
1273 s1->save_width = s->width;
1274 s1->save_height = s->height;
1275 s1->save_progressive_seq = s->progressive_sequence;
1277 /* low_delay may be forced, in this case we will have B-frames
1278 * that behave like P-frames. */
1279 avctx->has_b_frames = !(s->low_delay);
1281 assert((avctx->sub_id==1) == (avctx->codec_id==CODEC_ID_MPEG1VIDEO));
1282 if(avctx->codec_id==CODEC_ID_MPEG1VIDEO){
1284 avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1285 avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1287 avctx->sample_aspect_ratio= av_d2q(
1288 1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1289 avctx->ticks_per_frame=1;
1293 &s->avctx->time_base.den,
1294 &s->avctx->time_base.num,
1295 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1296 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1298 avctx->ticks_per_frame=2;
1300 if(s->aspect_ratio_info > 1){
1301 //we ignore the spec here as reality does not match the spec, see for example
1302 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1303 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) || 1){
1304 s->avctx->sample_aspect_ratio=
1306 ff_mpeg2_aspect[s->aspect_ratio_info],
1307 (AVRational){s->width, s->height}
1310 s->avctx->sample_aspect_ratio=
1312 ff_mpeg2_aspect[s->aspect_ratio_info],
1313 (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1317 s->avctx->sample_aspect_ratio=
1318 ff_mpeg2_aspect[s->aspect_ratio_info];
1322 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1323 avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1324 //until then pix_fmt may be changed right after codec init
1325 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
1327 s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
1328 if( avctx->idct_algo == FF_IDCT_AUTO )
1329 avctx->idct_algo = FF_IDCT_SIMPLE;
1331 /* Quantization matrices may need reordering
1332 * if DCT permutation is changed. */
1333 memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1335 if (MPV_common_init(s) < 0)
1338 quant_matrix_rebuild(s->intra_matrix, old_permutation,s->dsp.idct_permutation);
1339 quant_matrix_rebuild(s->inter_matrix, old_permutation,s->dsp.idct_permutation);
1340 quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1341 quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1343 s1->mpeg_enc_ctx_allocated = 1;
1348 static int mpeg1_decode_picture(AVCodecContext *avctx,
1349 const uint8_t *buf, int buf_size)
1351 Mpeg1Context *s1 = avctx->priv_data;
1352 MpegEncContext *s = &s1->mpeg_enc_ctx;
1353 int ref, f_code, vbv_delay;
1355 if(mpeg_decode_postinit(s->avctx) < 0)
1358 init_get_bits(&s->gb, buf, buf_size*8);
1360 ref = get_bits(&s->gb, 10); /* temporal ref */
1361 s->pict_type = get_bits(&s->gb, 3);
1362 if(s->pict_type == 0 || s->pict_type > 3)
1365 vbv_delay= get_bits(&s->gb, 16);
1366 if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
1367 s->full_pel[0] = get_bits1(&s->gb);
1368 f_code = get_bits(&s->gb, 3);
1369 if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1371 s->mpeg_f_code[0][0] = f_code;
1372 s->mpeg_f_code[0][1] = f_code;
1374 if (s->pict_type == FF_B_TYPE) {
1375 s->full_pel[1] = get_bits1(&s->gb);
1376 f_code = get_bits(&s->gb, 3);
1377 if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1379 s->mpeg_f_code[1][0] = f_code;
1380 s->mpeg_f_code[1][1] = f_code;
1382 s->current_picture.pict_type= s->pict_type;
1383 s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1385 if(avctx->debug & FF_DEBUG_PICT_INFO)
1386 av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1394 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1396 MpegEncContext *s= &s1->mpeg_enc_ctx;
1397 int horiz_size_ext, vert_size_ext;
1400 skip_bits(&s->gb, 1); /* profile and level esc*/
1401 s->avctx->profile= get_bits(&s->gb, 3);
1402 s->avctx->level= get_bits(&s->gb, 4);
1403 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1404 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1405 horiz_size_ext = get_bits(&s->gb, 2);
1406 vert_size_ext = get_bits(&s->gb, 2);
1407 s->width |= (horiz_size_ext << 12);
1408 s->height |= (vert_size_ext << 12);
1409 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1410 s->bit_rate += (bit_rate_ext << 18) * 400;
1411 skip_bits1(&s->gb); /* marker */
1412 s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1414 s->low_delay = get_bits1(&s->gb);
1415 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1417 s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1418 s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1420 dprintf(s->avctx, "sequence extension\n");
1421 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1422 s->avctx->sub_id = 2; /* indicates MPEG-2 found */
1424 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1425 av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1426 s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1430 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1432 MpegEncContext *s= &s1->mpeg_enc_ctx;
1433 int color_description, w, h;
1435 skip_bits(&s->gb, 3); /* video format */
1436 color_description= get_bits1(&s->gb);
1437 if(color_description){
1438 s->avctx->color_primaries= get_bits(&s->gb, 8);
1439 s->avctx->color_trc = get_bits(&s->gb, 8);
1440 s->avctx->colorspace = get_bits(&s->gb, 8);
1442 w= get_bits(&s->gb, 14);
1443 skip_bits(&s->gb, 1); //marker
1444 h= get_bits(&s->gb, 14);
1445 skip_bits(&s->gb, 1); //marker
1447 s1->pan_scan.width= 16*w;
1448 s1->pan_scan.height=16*h;
1450 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1451 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1454 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1456 MpegEncContext *s= &s1->mpeg_enc_ctx;
1460 if(s->progressive_sequence){
1461 if(s->repeat_first_field){
1463 if(s->top_field_first)
1467 if(s->picture_structure == PICT_FRAME){
1469 if(s->repeat_first_field)
1473 for(i=0; i<nofco; i++){
1474 s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1475 skip_bits(&s->gb, 1); //marker
1476 s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1477 skip_bits(&s->gb, 1); //marker
1480 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1481 av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1482 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1483 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1484 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1488 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra){
1491 for(i=0; i<64; i++) {
1492 int j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1493 int v = get_bits(&s->gb, 8);
1495 av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1498 if(intra && i==0 && v!=8){
1499 av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
1500 v= 8; // needed by pink.mpg / issue1046
1509 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1511 dprintf(s->avctx, "matrix extension\n");
1513 if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1514 if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1515 if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL , 1);
1516 if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL , 0);
1519 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1521 MpegEncContext *s= &s1->mpeg_enc_ctx;
1523 s->full_pel[0] = s->full_pel[1] = 0;
1524 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1525 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1526 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1527 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1528 if(!s->pict_type && s1->mpeg_enc_ctx_allocated){
1529 av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1530 if(s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1]==15){
1531 if(s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1532 s->pict_type= FF_I_TYPE;
1534 s->pict_type= FF_P_TYPE;
1536 s->pict_type= FF_B_TYPE;
1537 s->current_picture.pict_type= s->pict_type;
1538 s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1541 s->intra_dc_precision = get_bits(&s->gb, 2);
1542 s->picture_structure = get_bits(&s->gb, 2);
1543 s->top_field_first = get_bits1(&s->gb);
1544 s->frame_pred_frame_dct = get_bits1(&s->gb);
1545 s->concealment_motion_vectors = get_bits1(&s->gb);
1546 s->q_scale_type = get_bits1(&s->gb);
1547 s->intra_vlc_format = get_bits1(&s->gb);
1548 s->alternate_scan = get_bits1(&s->gb);
1549 s->repeat_first_field = get_bits1(&s->gb);
1550 s->chroma_420_type = get_bits1(&s->gb);
1551 s->progressive_frame = get_bits1(&s->gb);
1553 if(s->picture_structure == PICT_FRAME){
1555 s->v_edge_pos= 16*s->mb_height;
1557 s->first_field ^= 1;
1558 s->v_edge_pos= 8*s->mb_height;
1559 memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1562 if(s->alternate_scan){
1563 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
1564 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
1566 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
1567 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
1570 /* composite display not parsed */
1571 dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1572 dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1573 dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1574 dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1575 dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1576 dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1577 dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1578 dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1579 dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1582 static void mpeg_decode_extension(AVCodecContext *avctx,
1583 const uint8_t *buf, int buf_size)
1585 Mpeg1Context *s1 = avctx->priv_data;
1586 MpegEncContext *s = &s1->mpeg_enc_ctx;
1589 init_get_bits(&s->gb, buf, buf_size*8);
1591 ext_type = get_bits(&s->gb, 4);
1594 mpeg_decode_sequence_extension(s1);
1597 mpeg_decode_sequence_display_extension(s1);
1600 mpeg_decode_quant_matrix_extension(s);
1603 mpeg_decode_picture_display_extension(s1);
1606 mpeg_decode_picture_coding_extension(s1);
1611 static void exchange_uv(MpegEncContext *s){
1614 tmp = s->pblocks[4];
1615 s->pblocks[4] = s->pblocks[5];
1616 s->pblocks[5] = tmp;
1619 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size){
1620 AVCodecContext *avctx= s->avctx;
1621 Mpeg1Context *s1 = (Mpeg1Context*)s;
1623 /* start frame decoding */
1624 if(s->first_field || s->picture_structure==PICT_FRAME){
1625 if(MPV_frame_start(s, avctx) < 0)
1628 ff_er_frame_start(s);
1630 /* first check if we must repeat the frame */
1631 s->current_picture_ptr->repeat_pict = 0;
1632 if (s->repeat_first_field) {
1633 if (s->progressive_sequence) {
1634 if (s->top_field_first)
1635 s->current_picture_ptr->repeat_pict = 4;
1637 s->current_picture_ptr->repeat_pict = 2;
1638 } else if (s->progressive_frame) {
1639 s->current_picture_ptr->repeat_pict = 1;
1643 *s->current_picture_ptr->pan_scan= s1->pan_scan;
1644 }else{ //second field
1647 if(!s->current_picture_ptr){
1648 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1653 s->current_picture.data[i] = s->current_picture_ptr->data[i];
1654 if(s->picture_structure == PICT_BOTTOM_FIELD){
1655 s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1660 if (avctx->hwaccel) {
1661 if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1665 // MPV_frame_start will call this function too,
1666 // but we need to call it on every field
1667 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1668 if(ff_xvmc_field_start(s,avctx) < 0)
1674 #define DECODE_SLICE_ERROR -1
1675 #define DECODE_SLICE_OK 0
1678 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1679 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1680 * DECODE_SLICE_OK if this slice is ok<br>
1682 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1683 const uint8_t **buf, int buf_size)
1685 MpegEncContext *s = &s1->mpeg_enc_ctx;
1686 AVCodecContext *avctx= s->avctx;
1687 const int field_pic= s->picture_structure != PICT_FRAME;
1688 const int lowres= s->avctx->lowres;
1693 if (mb_y<<field_pic >= s->mb_height){
1694 av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
1698 init_get_bits(&s->gb, *buf, buf_size*8);
1700 ff_mpeg1_clean_buffers(s);
1701 s->interlaced_dct = 0;
1703 s->qscale = get_qscale(s);
1706 av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1710 /* extra slice info */
1711 while (get_bits1(&s->gb) != 0) {
1712 skip_bits(&s->gb, 8);
1718 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1720 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1727 /* otherwise, stuffing, nothing to do */
1733 if(s->mb_x >= (unsigned)s->mb_width){
1734 av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1738 if (avctx->hwaccel) {
1739 const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1740 int start_code = -1;
1741 buf_end = ff_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1742 if (buf_end < *buf + buf_size)
1745 if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1746 return DECODE_SLICE_ERROR;
1748 return DECODE_SLICE_OK;
1751 s->resync_mb_x= s->mb_x;
1752 s->resync_mb_y= s->mb_y= mb_y;
1754 ff_init_block_index(s);
1756 if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1757 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1758 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",
1759 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],
1760 s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")),
1761 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1762 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1763 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1768 //If 1, we memcpy blocks in xvmcvideo.
1769 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1770 ff_xvmc_init_block(s);//set s->block
1772 if(mpeg_decode_mb(s, s->block) < 0)
1775 if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1776 const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
1777 int xy = s->mb_x*2 + s->mb_y*2*wrap;
1778 int motion_x, motion_y, dir, i;
1779 if(field_pic && !s->first_field)
1783 for(dir=0; dir<2; dir++){
1784 if (s->mb_intra || (dir==1 && s->pict_type != FF_B_TYPE)) {
1785 motion_x = motion_y = 0;
1786 }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1787 motion_x = s->mv[dir][0][0];
1788 motion_y = s->mv[dir][0][1];
1789 } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1790 motion_x = s->mv[dir][i][0];
1791 motion_y = s->mv[dir][i][1];
1794 s->current_picture.motion_val[dir][xy ][0] = motion_x;
1795 s->current_picture.motion_val[dir][xy ][1] = motion_y;
1796 s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1797 s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1798 s->current_picture.ref_index [dir][xy ]=
1799 s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
1800 assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1806 s->dest[0] += 16 >> lowres;
1807 s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1808 s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1810 MPV_decode_mb(s, s->block);
1812 if (++s->mb_x >= s->mb_width) {
1813 const int mb_size= 16>>s->avctx->lowres;
1815 ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
1820 if(s->mb_y<<field_pic >= s->mb_height){
1821 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
1822 int is_d10= s->chroma_format==2 && s->pict_type==FF_I_TYPE && avctx->profile==0 && avctx->level==5
1823 && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1824 && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1826 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1827 || (avctx->error_recognition >= FF_ER_AGGRESSIVE && left>8)){
1828 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1834 ff_init_block_index(s);
1837 /* skip mb handling */
1838 if (s->mb_skip_run == -1) {
1839 /* read increment again */
1842 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1844 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1849 s->mb_skip_run += 33;
1850 }else if(code == 35){
1851 if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1852 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1855 goto eos; /* end of slice */
1857 /* otherwise, stuffing, nothing to do */
1859 s->mb_skip_run += code;
1865 if(s->pict_type == FF_I_TYPE){
1866 av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1873 s->block_last_index[i] = -1;
1874 if(s->picture_structure == PICT_FRAME)
1875 s->mv_type = MV_TYPE_16X16;
1877 s->mv_type = MV_TYPE_FIELD;
1878 if (s->pict_type == FF_P_TYPE) {
1879 /* if P type, zero motion vector is implied */
1880 s->mv_dir = MV_DIR_FORWARD;
1881 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1882 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1883 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1884 s->field_select[0][0]= s->picture_structure - 1;
1886 /* if B type, reuse previous vectors and directions */
1887 s->mv[0][0][0] = s->last_mv[0][0][0];
1888 s->mv[0][0][1] = s->last_mv[0][0][1];
1889 s->mv[1][0][0] = s->last_mv[1][0][0];
1890 s->mv[1][0][1] = s->last_mv[1][0][1];
1895 eos: // end of slice
1896 *buf += (get_bits_count(&s->gb)-1)/8;
1897 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1901 static int slice_decode_thread(AVCodecContext *c, void *arg){
1902 MpegEncContext *s= *(void**)arg;
1903 const uint8_t *buf= s->gb.buffer;
1904 int mb_y= s->start_mb_y;
1906 s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
1909 uint32_t start_code;
1912 ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1914 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1915 //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);
1917 if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1918 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);
1920 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);
1923 if(s->mb_y == s->end_mb_y)
1927 buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1928 mb_y= start_code - SLICE_MIN_START_CODE;
1929 if(mb_y < 0 || mb_y >= s->end_mb_y)
1933 return 0; //not reached
1937 * Handles slice ends.
1938 * @return 1 if it seems to be the last slice
1940 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1942 Mpeg1Context *s1 = avctx->priv_data;
1943 MpegEncContext *s = &s1->mpeg_enc_ctx;
1945 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1948 if (s->avctx->hwaccel) {
1949 if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1950 av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1953 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1954 ff_xvmc_field_end(s);
1956 /* end of slice reached */
1957 if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1960 s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1966 if (s->pict_type == FF_B_TYPE || s->low_delay) {
1967 *pict= *(AVFrame*)s->current_picture_ptr;
1968 ff_print_debug_info(s, pict);
1970 s->picture_number++;
1971 /* latency of 1 frame for I- and P-frames */
1972 /* XXX: use another variable than picture_number */
1973 if (s->last_picture_ptr != NULL) {
1974 *pict= *(AVFrame*)s->last_picture_ptr;
1975 ff_print_debug_info(s, pict);
1985 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1986 const uint8_t *buf, int buf_size)
1988 Mpeg1Context *s1 = avctx->priv_data;
1989 MpegEncContext *s = &s1->mpeg_enc_ctx;
1993 init_get_bits(&s->gb, buf, buf_size*8);
1995 width = get_bits(&s->gb, 12);
1996 height = get_bits(&s->gb, 12);
1997 if (width <= 0 || height <= 0)
1999 s->aspect_ratio_info= get_bits(&s->gb, 4);
2000 if (s->aspect_ratio_info == 0) {
2001 av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2002 if (avctx->error_recognition >= FF_ER_COMPLIANT)
2005 s->frame_rate_index = get_bits(&s->gb, 4);
2006 if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2008 s->bit_rate = get_bits(&s->gb, 18) * 400;
2009 if (get_bits1(&s->gb) == 0) /* marker */
2014 s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2015 skip_bits(&s->gb, 1);
2018 if (get_bits1(&s->gb)) {
2019 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2022 j = s->dsp.idct_permutation[i];
2023 v = ff_mpeg1_default_intra_matrix[i];
2024 s->intra_matrix[j] = v;
2025 s->chroma_intra_matrix[j] = v;
2028 if (get_bits1(&s->gb)) {
2029 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2032 int j= s->dsp.idct_permutation[i];
2033 v = ff_mpeg1_default_non_intra_matrix[i];
2034 s->inter_matrix[j] = v;
2035 s->chroma_inter_matrix[j] = v;
2039 if(show_bits(&s->gb, 23) != 0){
2040 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2044 /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2045 s->progressive_sequence = 1;
2046 s->progressive_frame = 1;
2047 s->picture_structure = PICT_FRAME;
2048 s->frame_pred_frame_dct = 1;
2049 s->chroma_format = 1;
2050 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2051 avctx->sub_id = 1; /* indicates MPEG-1 */
2052 s->out_format = FMT_MPEG1;
2053 s->swap_uv = 0;//AFAIK VCR2 does not have SEQ_HEADER
2054 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2056 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2057 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2058 s->avctx->rc_buffer_size, s->bit_rate);
2063 static int vcr2_init_sequence(AVCodecContext *avctx)
2065 Mpeg1Context *s1 = avctx->priv_data;
2066 MpegEncContext *s = &s1->mpeg_enc_ctx;
2069 /* start new MPEG-1 context decoding */
2070 s->out_format = FMT_MPEG1;
2071 if (s1->mpeg_enc_ctx_allocated) {
2074 s->width = avctx->coded_width;
2075 s->height = avctx->coded_height;
2076 avctx->has_b_frames= 0; //true?
2079 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2080 avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2082 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel ||
2083 s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
2084 if( avctx->idct_algo == FF_IDCT_AUTO )
2085 avctx->idct_algo = FF_IDCT_SIMPLE;
2087 if (MPV_common_init(s) < 0)
2089 exchange_uv(s);//common init reset pblocks, so we swap them here
2090 s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2091 s1->mpeg_enc_ctx_allocated = 1;
2094 int j= s->dsp.idct_permutation[i];
2095 v = ff_mpeg1_default_intra_matrix[i];
2096 s->intra_matrix[j] = v;
2097 s->chroma_intra_matrix[j] = v;
2099 v = ff_mpeg1_default_non_intra_matrix[i];
2100 s->inter_matrix[j] = v;
2101 s->chroma_inter_matrix[j] = v;
2104 s->progressive_sequence = 1;
2105 s->progressive_frame = 1;
2106 s->picture_structure = PICT_FRAME;
2107 s->frame_pred_frame_dct = 1;
2108 s->chroma_format = 1;
2109 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2110 avctx->sub_id = 2; /* indicates MPEG-2 */
2115 static void mpeg_decode_user_data(AVCodecContext *avctx,
2116 const uint8_t *buf, int buf_size)
2123 /* we parse the DTG active format information */
2125 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2139 avctx->dtg_active_format = p[0] & 0x0f;
2144 static void mpeg_decode_gop(AVCodecContext *avctx,
2145 const uint8_t *buf, int buf_size){
2146 Mpeg1Context *s1 = avctx->priv_data;
2147 MpegEncContext *s = &s1->mpeg_enc_ctx;
2149 int drop_frame_flag;
2150 int time_code_hours, time_code_minutes;
2151 int time_code_seconds, time_code_pictures;
2154 init_get_bits(&s->gb, buf, buf_size*8);
2156 drop_frame_flag = get_bits1(&s->gb);
2158 time_code_hours=get_bits(&s->gb,5);
2159 time_code_minutes = get_bits(&s->gb,6);
2160 skip_bits1(&s->gb);//marker bit
2161 time_code_seconds = get_bits(&s->gb,6);
2162 time_code_pictures = get_bits(&s->gb,6);
2164 s->closed_gop = get_bits1(&s->gb);
2165 /*broken_link indicate that after editing the
2166 reference frames of the first B-Frames after GOP I-Frame
2167 are missing (open gop)*/
2168 broken_link = get_bits1(&s->gb);
2170 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2171 av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2172 time_code_hours, time_code_minutes, time_code_seconds,
2173 time_code_pictures, s->closed_gop, broken_link);
2176 * Finds the end of the current frame in the bitstream.
2177 * @return the position of the first byte of the next frame, or -1
2179 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2182 uint32_t state= pc->state;
2184 /* EOF considered as end of frame */
2189 0 frame start -> 1/4
2190 1 first_SEQEXT -> 0/2
2191 2 first field start -> 3/0
2192 3 second_SEQEXT -> 2/0
2196 for(i=0; i<buf_size; i++){
2197 assert(pc->frame_start_found>=0 && pc->frame_start_found<=4);
2198 if(pc->frame_start_found&1){
2199 if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80)
2200 pc->frame_start_found--;
2201 else if(state == EXT_START_CODE+2){
2202 if((buf[i]&3) == 3) pc->frame_start_found= 0;
2203 else pc->frame_start_found= (pc->frame_start_found+1)&3;
2207 i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2208 if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2210 pc->frame_start_found=4;
2212 if(state == SEQ_END_CODE){
2216 if(pc->frame_start_found==2 && state == SEQ_START_CODE)
2217 pc->frame_start_found= 0;
2218 if(pc->frame_start_found<4 && state == EXT_START_CODE)
2219 pc->frame_start_found++;
2220 if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){
2221 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2222 pc->frame_start_found=0;
2227 if(s && state == PICTURE_START_CODE){
2228 ff_fetch_timestamp(s, i-3, 1);
2233 return END_NOT_FOUND;
2236 static int decode_chunks(AVCodecContext *avctx,
2237 AVFrame *picture, int *data_size,
2238 const uint8_t *buf, int buf_size);
2240 /* handle buffering and image synchronisation */
2241 static int mpeg_decode_frame(AVCodecContext *avctx,
2242 void *data, int *data_size,
2245 const uint8_t *buf = avpkt->data;
2246 int buf_size = avpkt->size;
2247 Mpeg1Context *s = avctx->priv_data;
2248 AVFrame *picture = data;
2249 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2250 dprintf(avctx, "fill_buffer\n");
2252 if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2253 /* special case for last picture */
2254 if (s2->low_delay==0 && s2->next_picture_ptr) {
2255 *picture= *(AVFrame*)s2->next_picture_ptr;
2256 s2->next_picture_ptr= NULL;
2258 *data_size = sizeof(AVFrame);
2263 if(s2->flags&CODEC_FLAG_TRUNCATED){
2264 int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2266 if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2271 if (s->repeat_field % 2 == 1) {
2273 //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2274 // s2->picture_number, s->repeat_field);
2275 if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2276 *data_size = sizeof(AVPicture);
2282 if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == AV_RL32("VCR2"))
2283 vcr2_init_sequence(avctx);
2287 if(avctx->extradata && !avctx->frame_number)
2288 decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2290 return decode_chunks(avctx, picture, data_size, buf, buf_size);
2293 static int decode_chunks(AVCodecContext *avctx,
2294 AVFrame *picture, int *data_size,
2295 const uint8_t *buf, int buf_size)
2297 Mpeg1Context *s = avctx->priv_data;
2298 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2299 const uint8_t *buf_ptr = buf;
2300 const uint8_t *buf_end = buf + buf_size;
2301 int ret, input_size;
2304 /* find next start code */
2305 uint32_t start_code = -1;
2306 buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2307 if (start_code > 0x1ff){
2308 if(s2->pict_type != FF_B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2309 if(avctx->thread_count > 1){
2312 avctx->execute(avctx, slice_decode_thread, (void**)&(s2->thread_context[0]), NULL, s->slice_count, sizeof(void*));
2313 for(i=0; i<s->slice_count; i++)
2314 s2->error_count += s2->thread_context[i]->error_count;
2317 if (CONFIG_MPEG_VDPAU_DECODER && avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)
2318 ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2320 if (slice_end(avctx, picture)) {
2321 if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2322 *data_size = sizeof(AVPicture);
2326 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2329 input_size = buf_end - buf_ptr;
2331 if(avctx->debug & FF_DEBUG_STARTCODE){
2332 av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2335 /* prepare data for next start code */
2336 switch(start_code) {
2337 case SEQ_START_CODE:
2338 mpeg1_decode_sequence(avctx, buf_ptr,
2342 case PICTURE_START_CODE:
2343 /* we have a complete image: we try to decompress it */
2344 if(mpeg1_decode_picture(avctx,
2345 buf_ptr, input_size) < 0)
2348 case EXT_START_CODE:
2349 mpeg_decode_extension(avctx,
2350 buf_ptr, input_size);
2352 case USER_START_CODE:
2353 mpeg_decode_user_data(avctx,
2354 buf_ptr, input_size);
2356 case GOP_START_CODE:
2358 mpeg_decode_gop(avctx,
2359 buf_ptr, input_size);
2362 if (start_code >= SLICE_MIN_START_CODE &&
2363 start_code <= SLICE_MAX_START_CODE) {
2364 int mb_y= start_code - SLICE_MIN_START_CODE;
2366 if(s2->last_picture_ptr==NULL){
2367 /* Skip B-frames if we do not have reference frames and gop is not closed */
2368 if(s2->pict_type==FF_B_TYPE){
2372 /* Allocate a dummy frame */
2373 i= ff_find_unused_picture(s2, 0);
2374 s2->last_picture_ptr= &s2->picture[i];
2375 if(ff_alloc_picture(s2, s2->last_picture_ptr, 0) < 0)
2379 if(s2->next_picture_ptr==NULL){
2380 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2381 if(s2->pict_type==FF_P_TYPE && (s2->first_field || s2->picture_structure==PICT_FRAME)) break;
2383 /* Skip B-frames if we are in a hurry. */
2384 if(avctx->hurry_up && s2->pict_type==FF_B_TYPE) break;
2385 if( (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==FF_B_TYPE)
2386 ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=FF_I_TYPE)
2387 || avctx->skip_frame >= AVDISCARD_ALL)
2389 /* Skip everything if we are in a hurry>=5. */
2390 if(avctx->hurry_up>=5) break;
2392 if (!s->mpeg_enc_ctx_allocated) break;
2394 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2395 if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2400 av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2404 if(s2->first_slice){
2406 if(mpeg_field_start(s2, buf, buf_size) < 0)
2409 if(!s2->current_picture_ptr){
2410 av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2414 if (avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU) {
2419 if(avctx->thread_count > 1){
2420 int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2421 if(threshold <= mb_y){
2422 MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2424 thread_context->start_mb_y= mb_y;
2425 thread_context->end_mb_y = s2->mb_height;
2427 s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2428 ff_update_duplicate_context(thread_context, s2);
2430 init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2433 buf_ptr += 2; //FIXME add minimum number of bytes per slice
2435 ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2439 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2440 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);
2442 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);
2451 static int mpeg_decode_end(AVCodecContext *avctx)
2453 Mpeg1Context *s = avctx->priv_data;
2455 if (s->mpeg_enc_ctx_allocated)
2456 MPV_common_end(&s->mpeg_enc_ctx);
2460 AVCodec mpeg1video_decoder = {
2463 CODEC_ID_MPEG1VIDEO,
2464 sizeof(Mpeg1Context),
2469 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2470 .flush= ff_mpeg_flush,
2471 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2474 AVCodec mpeg2video_decoder = {
2477 CODEC_ID_MPEG2VIDEO,
2478 sizeof(Mpeg1Context),
2483 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2484 .flush= ff_mpeg_flush,
2485 .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2489 AVCodec mpegvideo_decoder = {
2492 CODEC_ID_MPEG2VIDEO,
2493 sizeof(Mpeg1Context),
2498 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2499 .flush= ff_mpeg_flush,
2500 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2503 #if CONFIG_MPEG_XVMC_DECODER
2504 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx){
2505 if( avctx->thread_count > 1)
2507 if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2509 if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2510 dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2512 mpeg_decode_init(avctx);
2514 avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2515 avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2520 AVCodec mpeg_xvmc_decoder = {
2523 CODEC_ID_MPEG2VIDEO_XVMC,
2524 sizeof(Mpeg1Context),
2525 mpeg_mc_decode_init,
2529 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2530 .flush= ff_mpeg_flush,
2531 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2536 #if CONFIG_MPEG_VDPAU_DECODER
2537 AVCodec mpeg_vdpau_decoder = {
2540 CODEC_ID_MPEG2VIDEO,
2541 sizeof(Mpeg1Context),
2546 CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2547 .flush= ff_mpeg_flush,
2548 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2552 #if CONFIG_MPEG1_VDPAU_DECODER
2553 AVCodec mpeg1_vdpau_decoder = {
2556 CODEC_ID_MPEG1VIDEO,
2557 sizeof(Mpeg1Context),
2562 CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2563 .flush= ff_mpeg_flush,
2564 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),