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 init_get_bits(&s->gb, buf, buf_size*8);
1357 ref = get_bits(&s->gb, 10); /* temporal ref */
1358 s->pict_type = get_bits(&s->gb, 3);
1359 if(s->pict_type == 0 || s->pict_type > 3)
1362 vbv_delay= get_bits(&s->gb, 16);
1363 if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
1364 s->full_pel[0] = get_bits1(&s->gb);
1365 f_code = get_bits(&s->gb, 3);
1366 if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1368 s->mpeg_f_code[0][0] = f_code;
1369 s->mpeg_f_code[0][1] = f_code;
1371 if (s->pict_type == FF_B_TYPE) {
1372 s->full_pel[1] = get_bits1(&s->gb);
1373 f_code = get_bits(&s->gb, 3);
1374 if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1376 s->mpeg_f_code[1][0] = f_code;
1377 s->mpeg_f_code[1][1] = f_code;
1379 s->current_picture.pict_type= s->pict_type;
1380 s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1382 if(avctx->debug & FF_DEBUG_PICT_INFO)
1383 av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1390 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1392 MpegEncContext *s= &s1->mpeg_enc_ctx;
1393 int horiz_size_ext, vert_size_ext;
1396 skip_bits(&s->gb, 1); /* profile and level esc*/
1397 s->avctx->profile= get_bits(&s->gb, 3);
1398 s->avctx->level= get_bits(&s->gb, 4);
1399 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1400 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1401 horiz_size_ext = get_bits(&s->gb, 2);
1402 vert_size_ext = get_bits(&s->gb, 2);
1403 s->width |= (horiz_size_ext << 12);
1404 s->height |= (vert_size_ext << 12);
1405 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1406 s->bit_rate += (bit_rate_ext << 18) * 400;
1407 skip_bits1(&s->gb); /* marker */
1408 s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1410 s->low_delay = get_bits1(&s->gb);
1411 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1413 s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1414 s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1416 dprintf(s->avctx, "sequence extension\n");
1417 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1418 s->avctx->sub_id = 2; /* indicates MPEG-2 found */
1420 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1421 av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1422 s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1426 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1428 MpegEncContext *s= &s1->mpeg_enc_ctx;
1429 int color_description, w, h;
1431 skip_bits(&s->gb, 3); /* video format */
1432 color_description= get_bits1(&s->gb);
1433 if(color_description){
1434 s->avctx->color_primaries= get_bits(&s->gb, 8);
1435 s->avctx->color_trc = get_bits(&s->gb, 8);
1436 s->avctx->colorspace = get_bits(&s->gb, 8);
1438 w= get_bits(&s->gb, 14);
1439 skip_bits(&s->gb, 1); //marker
1440 h= get_bits(&s->gb, 14);
1441 skip_bits(&s->gb, 1); //marker
1443 s1->pan_scan.width= 16*w;
1444 s1->pan_scan.height=16*h;
1446 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1447 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1450 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1452 MpegEncContext *s= &s1->mpeg_enc_ctx;
1456 if(s->progressive_sequence){
1457 if(s->repeat_first_field){
1459 if(s->top_field_first)
1463 if(s->picture_structure == PICT_FRAME){
1465 if(s->repeat_first_field)
1469 for(i=0; i<nofco; i++){
1470 s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1471 skip_bits(&s->gb, 1); //marker
1472 s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1473 skip_bits(&s->gb, 1); //marker
1476 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1477 av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1478 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1479 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1480 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1484 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra){
1487 for(i=0; i<64; i++) {
1488 int j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1489 int v = get_bits(&s->gb, 8);
1491 av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1494 if(intra && i==0 && v!=8){
1495 av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
1496 v= 8; // needed by pink.mpg / issue1046
1505 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1507 dprintf(s->avctx, "matrix extension\n");
1509 if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1510 if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1511 if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL , 1);
1512 if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL , 0);
1515 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1517 MpegEncContext *s= &s1->mpeg_enc_ctx;
1519 s->full_pel[0] = s->full_pel[1] = 0;
1520 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1521 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1522 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1523 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1524 if(!s->pict_type && s1->mpeg_enc_ctx_allocated){
1525 av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1526 if(s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1]==15){
1527 if(s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1528 s->pict_type= FF_I_TYPE;
1530 s->pict_type= FF_P_TYPE;
1532 s->pict_type= FF_B_TYPE;
1533 s->current_picture.pict_type= s->pict_type;
1534 s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1536 s->intra_dc_precision = get_bits(&s->gb, 2);
1537 s->picture_structure = get_bits(&s->gb, 2);
1538 s->top_field_first = get_bits1(&s->gb);
1539 s->frame_pred_frame_dct = get_bits1(&s->gb);
1540 s->concealment_motion_vectors = get_bits1(&s->gb);
1541 s->q_scale_type = get_bits1(&s->gb);
1542 s->intra_vlc_format = get_bits1(&s->gb);
1543 s->alternate_scan = get_bits1(&s->gb);
1544 s->repeat_first_field = get_bits1(&s->gb);
1545 s->chroma_420_type = get_bits1(&s->gb);
1546 s->progressive_frame = get_bits1(&s->gb);
1548 if(s->picture_structure == PICT_FRAME){
1550 s->v_edge_pos= 16*s->mb_height;
1552 s->first_field ^= 1;
1553 s->v_edge_pos= 8*s->mb_height;
1554 memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1557 if(s->alternate_scan){
1558 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
1559 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
1561 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
1562 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
1565 /* composite display not parsed */
1566 dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1567 dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1568 dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1569 dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1570 dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1571 dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1572 dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1573 dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1574 dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1577 static void exchange_uv(MpegEncContext *s){
1580 tmp = s->pblocks[4];
1581 s->pblocks[4] = s->pblocks[5];
1582 s->pblocks[5] = tmp;
1585 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size){
1586 AVCodecContext *avctx= s->avctx;
1587 Mpeg1Context *s1 = (Mpeg1Context*)s;
1589 /* start frame decoding */
1590 if(s->first_field || s->picture_structure==PICT_FRAME){
1591 if(MPV_frame_start(s, avctx) < 0)
1594 ff_er_frame_start(s);
1596 /* first check if we must repeat the frame */
1597 s->current_picture_ptr->repeat_pict = 0;
1598 if (s->repeat_first_field) {
1599 if (s->progressive_sequence) {
1600 if (s->top_field_first)
1601 s->current_picture_ptr->repeat_pict = 4;
1603 s->current_picture_ptr->repeat_pict = 2;
1604 } else if (s->progressive_frame) {
1605 s->current_picture_ptr->repeat_pict = 1;
1609 *s->current_picture_ptr->pan_scan= s1->pan_scan;
1610 }else{ //second field
1613 if(!s->current_picture_ptr){
1614 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1619 s->current_picture.data[i] = s->current_picture_ptr->data[i];
1620 if(s->picture_structure == PICT_BOTTOM_FIELD){
1621 s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1626 if (avctx->hwaccel) {
1627 if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1631 // MPV_frame_start will call this function too,
1632 // but we need to call it on every field
1633 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1634 if(ff_xvmc_field_start(s,avctx) < 0)
1640 #define DECODE_SLICE_ERROR -1
1641 #define DECODE_SLICE_OK 0
1644 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1645 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1646 * DECODE_SLICE_OK if this slice is ok<br>
1648 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1649 const uint8_t **buf, int buf_size)
1651 MpegEncContext *s = &s1->mpeg_enc_ctx;
1652 AVCodecContext *avctx= s->avctx;
1653 const int field_pic= s->picture_structure != PICT_FRAME;
1654 const int lowres= s->avctx->lowres;
1659 if (mb_y<<field_pic >= s->mb_height){
1660 av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
1664 init_get_bits(&s->gb, *buf, buf_size*8);
1666 ff_mpeg1_clean_buffers(s);
1667 s->interlaced_dct = 0;
1669 s->qscale = get_qscale(s);
1672 av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1676 /* extra slice info */
1677 while (get_bits1(&s->gb) != 0) {
1678 skip_bits(&s->gb, 8);
1684 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1686 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1693 /* otherwise, stuffing, nothing to do */
1699 if(s->mb_x >= (unsigned)s->mb_width){
1700 av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1704 if (avctx->hwaccel) {
1705 const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1706 int start_code = -1;
1707 buf_end = ff_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1708 if (buf_end < *buf + buf_size)
1711 if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1712 return DECODE_SLICE_ERROR;
1714 return DECODE_SLICE_OK;
1717 s->resync_mb_x= s->mb_x;
1718 s->resync_mb_y= s->mb_y= mb_y;
1720 ff_init_block_index(s);
1722 if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1723 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1724 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",
1725 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],
1726 s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")),
1727 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1728 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1729 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1734 //If 1, we memcpy blocks in xvmcvideo.
1735 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1736 ff_xvmc_init_block(s);//set s->block
1738 if(mpeg_decode_mb(s, s->block) < 0)
1741 if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1742 const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
1743 int xy = s->mb_x*2 + s->mb_y*2*wrap;
1744 int motion_x, motion_y, dir, i;
1745 if(field_pic && !s->first_field)
1749 for(dir=0; dir<2; dir++){
1750 if (s->mb_intra || (dir==1 && s->pict_type != FF_B_TYPE)) {
1751 motion_x = motion_y = 0;
1752 }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1753 motion_x = s->mv[dir][0][0];
1754 motion_y = s->mv[dir][0][1];
1755 } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1756 motion_x = s->mv[dir][i][0];
1757 motion_y = s->mv[dir][i][1];
1760 s->current_picture.motion_val[dir][xy ][0] = motion_x;
1761 s->current_picture.motion_val[dir][xy ][1] = motion_y;
1762 s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1763 s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1764 s->current_picture.ref_index [dir][xy ]=
1765 s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
1766 assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1772 s->dest[0] += 16 >> lowres;
1773 s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1774 s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1776 MPV_decode_mb(s, s->block);
1778 if (++s->mb_x >= s->mb_width) {
1779 const int mb_size= 16>>s->avctx->lowres;
1781 ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
1786 if(s->mb_y<<field_pic >= s->mb_height){
1787 int left= get_bits_left(&s->gb);
1788 int is_d10= s->chroma_format==2 && s->pict_type==FF_I_TYPE && avctx->profile==0 && avctx->level==5
1789 && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1790 && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1792 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1793 || (avctx->error_recognition >= FF_ER_AGGRESSIVE && left>8)){
1794 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1800 ff_init_block_index(s);
1803 /* skip mb handling */
1804 if (s->mb_skip_run == -1) {
1805 /* read increment again */
1808 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1810 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1815 s->mb_skip_run += 33;
1816 }else if(code == 35){
1817 if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1818 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1821 goto eos; /* end of slice */
1823 /* otherwise, stuffing, nothing to do */
1825 s->mb_skip_run += code;
1831 if(s->pict_type == FF_I_TYPE){
1832 av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1839 s->block_last_index[i] = -1;
1840 if(s->picture_structure == PICT_FRAME)
1841 s->mv_type = MV_TYPE_16X16;
1843 s->mv_type = MV_TYPE_FIELD;
1844 if (s->pict_type == FF_P_TYPE) {
1845 /* if P type, zero motion vector is implied */
1846 s->mv_dir = MV_DIR_FORWARD;
1847 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1848 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1849 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1850 s->field_select[0][0]= (s->picture_structure - 1) & 1;
1852 /* if B type, reuse previous vectors and directions */
1853 s->mv[0][0][0] = s->last_mv[0][0][0];
1854 s->mv[0][0][1] = s->last_mv[0][0][1];
1855 s->mv[1][0][0] = s->last_mv[1][0][0];
1856 s->mv[1][0][1] = s->last_mv[1][0][1];
1861 eos: // end of slice
1862 *buf += (get_bits_count(&s->gb)-1)/8;
1863 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1867 static int slice_decode_thread(AVCodecContext *c, void *arg){
1868 MpegEncContext *s= *(void**)arg;
1869 const uint8_t *buf= s->gb.buffer;
1870 int mb_y= s->start_mb_y;
1872 s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
1875 uint32_t start_code;
1878 ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1880 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1881 //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);
1883 if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1884 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);
1886 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);
1889 if(s->mb_y == s->end_mb_y)
1893 buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1894 mb_y= start_code - SLICE_MIN_START_CODE;
1895 if(mb_y < 0 || mb_y >= s->end_mb_y)
1899 return 0; //not reached
1903 * Handles slice ends.
1904 * @return 1 if it seems to be the last slice
1906 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1908 Mpeg1Context *s1 = avctx->priv_data;
1909 MpegEncContext *s = &s1->mpeg_enc_ctx;
1911 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1914 if (s->avctx->hwaccel) {
1915 if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1916 av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1919 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1920 ff_xvmc_field_end(s);
1922 /* end of slice reached */
1923 if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1926 s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1932 if (s->pict_type == FF_B_TYPE || s->low_delay) {
1933 *pict= *(AVFrame*)s->current_picture_ptr;
1934 ff_print_debug_info(s, pict);
1936 s->picture_number++;
1937 /* latency of 1 frame for I- and P-frames */
1938 /* XXX: use another variable than picture_number */
1939 if (s->last_picture_ptr != NULL) {
1940 *pict= *(AVFrame*)s->last_picture_ptr;
1941 ff_print_debug_info(s, pict);
1951 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1952 const uint8_t *buf, int buf_size)
1954 Mpeg1Context *s1 = avctx->priv_data;
1955 MpegEncContext *s = &s1->mpeg_enc_ctx;
1959 init_get_bits(&s->gb, buf, buf_size*8);
1961 width = get_bits(&s->gb, 12);
1962 height = get_bits(&s->gb, 12);
1963 if (width <= 0 || height <= 0)
1965 s->aspect_ratio_info= get_bits(&s->gb, 4);
1966 if (s->aspect_ratio_info == 0) {
1967 av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1968 if (avctx->error_recognition >= FF_ER_COMPLIANT)
1971 s->frame_rate_index = get_bits(&s->gb, 4);
1972 if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1974 s->bit_rate = get_bits(&s->gb, 18) * 400;
1975 if (get_bits1(&s->gb) == 0) /* marker */
1980 s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
1981 skip_bits(&s->gb, 1);
1984 if (get_bits1(&s->gb)) {
1985 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1988 j = s->dsp.idct_permutation[i];
1989 v = ff_mpeg1_default_intra_matrix[i];
1990 s->intra_matrix[j] = v;
1991 s->chroma_intra_matrix[j] = v;
1994 if (get_bits1(&s->gb)) {
1995 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1998 int j= s->dsp.idct_permutation[i];
1999 v = ff_mpeg1_default_non_intra_matrix[i];
2000 s->inter_matrix[j] = v;
2001 s->chroma_inter_matrix[j] = v;
2005 if(show_bits(&s->gb, 23) != 0){
2006 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2010 /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2011 s->progressive_sequence = 1;
2012 s->progressive_frame = 1;
2013 s->picture_structure = PICT_FRAME;
2014 s->frame_pred_frame_dct = 1;
2015 s->chroma_format = 1;
2016 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2017 avctx->sub_id = 1; /* indicates MPEG-1 */
2018 s->out_format = FMT_MPEG1;
2019 s->swap_uv = 0;//AFAIK VCR2 does not have SEQ_HEADER
2020 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2022 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2023 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2024 s->avctx->rc_buffer_size, s->bit_rate);
2029 static int vcr2_init_sequence(AVCodecContext *avctx)
2031 Mpeg1Context *s1 = avctx->priv_data;
2032 MpegEncContext *s = &s1->mpeg_enc_ctx;
2035 /* start new MPEG-1 context decoding */
2036 s->out_format = FMT_MPEG1;
2037 if (s1->mpeg_enc_ctx_allocated) {
2040 s->width = avctx->coded_width;
2041 s->height = avctx->coded_height;
2042 avctx->has_b_frames= 0; //true?
2045 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2046 avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2048 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel ||
2049 s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
2050 if( avctx->idct_algo == FF_IDCT_AUTO )
2051 avctx->idct_algo = FF_IDCT_SIMPLE;
2053 if (MPV_common_init(s) < 0)
2055 exchange_uv(s);//common init reset pblocks, so we swap them here
2056 s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2057 s1->mpeg_enc_ctx_allocated = 1;
2060 int j= s->dsp.idct_permutation[i];
2061 v = ff_mpeg1_default_intra_matrix[i];
2062 s->intra_matrix[j] = v;
2063 s->chroma_intra_matrix[j] = v;
2065 v = ff_mpeg1_default_non_intra_matrix[i];
2066 s->inter_matrix[j] = v;
2067 s->chroma_inter_matrix[j] = v;
2070 s->progressive_sequence = 1;
2071 s->progressive_frame = 1;
2072 s->picture_structure = PICT_FRAME;
2073 s->frame_pred_frame_dct = 1;
2074 s->chroma_format = 1;
2075 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2076 avctx->sub_id = 2; /* indicates MPEG-2 */
2081 static void mpeg_decode_user_data(AVCodecContext *avctx,
2082 const uint8_t *p, int buf_size)
2084 const uint8_t *buf_end = p+buf_size;
2086 /* we parse the DTG active format information */
2087 if (buf_end - p >= 5 &&
2088 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2096 if (buf_end - p < 1)
2098 avctx->dtg_active_format = p[0] & 0x0f;
2103 static void mpeg_decode_gop(AVCodecContext *avctx,
2104 const uint8_t *buf, int buf_size){
2105 Mpeg1Context *s1 = avctx->priv_data;
2106 MpegEncContext *s = &s1->mpeg_enc_ctx;
2108 int drop_frame_flag;
2109 int time_code_hours, time_code_minutes;
2110 int time_code_seconds, time_code_pictures;
2113 init_get_bits(&s->gb, buf, buf_size*8);
2115 drop_frame_flag = get_bits1(&s->gb);
2117 time_code_hours=get_bits(&s->gb,5);
2118 time_code_minutes = get_bits(&s->gb,6);
2119 skip_bits1(&s->gb);//marker bit
2120 time_code_seconds = get_bits(&s->gb,6);
2121 time_code_pictures = get_bits(&s->gb,6);
2123 s->closed_gop = get_bits1(&s->gb);
2124 /*broken_link indicate that after editing the
2125 reference frames of the first B-Frames after GOP I-Frame
2126 are missing (open gop)*/
2127 broken_link = get_bits1(&s->gb);
2129 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2130 av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2131 time_code_hours, time_code_minutes, time_code_seconds,
2132 time_code_pictures, s->closed_gop, broken_link);
2135 * Finds the end of the current frame in the bitstream.
2136 * @return the position of the first byte of the next frame, or -1
2138 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2141 uint32_t state= pc->state;
2143 /* EOF considered as end of frame */
2148 0 frame start -> 1/4
2149 1 first_SEQEXT -> 0/2
2150 2 first field start -> 3/0
2151 3 second_SEQEXT -> 2/0
2155 for(i=0; i<buf_size; i++){
2156 assert(pc->frame_start_found>=0 && pc->frame_start_found<=4);
2157 if(pc->frame_start_found&1){
2158 if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80)
2159 pc->frame_start_found--;
2160 else if(state == EXT_START_CODE+2){
2161 if((buf[i]&3) == 3) pc->frame_start_found= 0;
2162 else pc->frame_start_found= (pc->frame_start_found+1)&3;
2166 i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2167 if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2169 pc->frame_start_found=4;
2171 if(state == SEQ_END_CODE){
2175 if(pc->frame_start_found==2 && state == SEQ_START_CODE)
2176 pc->frame_start_found= 0;
2177 if(pc->frame_start_found<4 && state == EXT_START_CODE)
2178 pc->frame_start_found++;
2179 if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){
2180 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2181 pc->frame_start_found=0;
2186 if(s && state == PICTURE_START_CODE){
2187 ff_fetch_timestamp(s, i-3, 1);
2192 return END_NOT_FOUND;
2195 static int decode_chunks(AVCodecContext *avctx,
2196 AVFrame *picture, int *data_size,
2197 const uint8_t *buf, int buf_size);
2199 /* handle buffering and image synchronisation */
2200 static int mpeg_decode_frame(AVCodecContext *avctx,
2201 void *data, int *data_size,
2204 const uint8_t *buf = avpkt->data;
2205 int buf_size = avpkt->size;
2206 Mpeg1Context *s = avctx->priv_data;
2207 AVFrame *picture = data;
2208 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2209 dprintf(avctx, "fill_buffer\n");
2211 if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2212 /* special case for last picture */
2213 if (s2->low_delay==0 && s2->next_picture_ptr) {
2214 *picture= *(AVFrame*)s2->next_picture_ptr;
2215 s2->next_picture_ptr= NULL;
2217 *data_size = sizeof(AVFrame);
2222 if(s2->flags&CODEC_FLAG_TRUNCATED){
2223 int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2225 if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2230 if (s->repeat_field % 2 == 1) {
2232 //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2233 // s2->picture_number, s->repeat_field);
2234 if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2235 *data_size = sizeof(AVPicture);
2241 if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == AV_RL32("VCR2"))
2242 vcr2_init_sequence(avctx);
2246 if(avctx->extradata && !avctx->frame_number)
2247 decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2249 return decode_chunks(avctx, picture, data_size, buf, buf_size);
2252 static int decode_chunks(AVCodecContext *avctx,
2253 AVFrame *picture, int *data_size,
2254 const uint8_t *buf, int buf_size)
2256 Mpeg1Context *s = avctx->priv_data;
2257 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2258 const uint8_t *buf_ptr = buf;
2259 const uint8_t *buf_end = buf + buf_size;
2260 int ret, input_size;
2264 /* find next start code */
2265 uint32_t start_code = -1;
2266 buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2267 if (start_code > 0x1ff){
2268 if(s2->pict_type != FF_B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2269 if(avctx->thread_count > 1){
2272 avctx->execute(avctx, slice_decode_thread, &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
2273 for(i=0; i<s->slice_count; i++)
2274 s2->error_count += s2->thread_context[i]->error_count;
2277 if (CONFIG_MPEG_VDPAU_DECODER && avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)
2278 ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2280 if (slice_end(avctx, picture)) {
2281 if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2282 *data_size = sizeof(AVPicture);
2286 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2289 input_size = buf_end - buf_ptr;
2291 if(avctx->debug & FF_DEBUG_STARTCODE){
2292 av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2295 /* prepare data for next start code */
2296 switch(start_code) {
2297 case SEQ_START_CODE:
2299 mpeg1_decode_sequence(avctx, buf_ptr,
2302 av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2306 case PICTURE_START_CODE:
2307 if(last_code == 0 || last_code == SLICE_MIN_START_CODE){
2308 if(mpeg_decode_postinit(avctx) < 0){
2309 av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
2313 /* we have a complete image: we try to decompress it */
2314 if(mpeg1_decode_picture(avctx,
2315 buf_ptr, input_size) < 0)
2317 s2->first_slice = 1;
2318 last_code= PICTURE_START_CODE;
2320 av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
2323 case EXT_START_CODE:
2324 init_get_bits(&s2->gb, buf_ptr, input_size*8);
2326 switch(get_bits(&s2->gb, 4)) {
2329 mpeg_decode_sequence_extension(s);
2331 av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
2335 mpeg_decode_sequence_display_extension(s);
2338 mpeg_decode_quant_matrix_extension(s2);
2341 mpeg_decode_picture_display_extension(s);
2344 if(last_code == PICTURE_START_CODE){
2345 mpeg_decode_picture_coding_extension(s);
2347 av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
2352 case USER_START_CODE:
2353 mpeg_decode_user_data(avctx,
2354 buf_ptr, input_size);
2356 case GOP_START_CODE:
2359 mpeg_decode_gop(avctx,
2360 buf_ptr, input_size);
2362 av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
2366 if (start_code >= SLICE_MIN_START_CODE &&
2367 start_code <= SLICE_MAX_START_CODE && last_code!=0) {
2368 int mb_y= start_code - SLICE_MIN_START_CODE;
2369 last_code= SLICE_MIN_START_CODE;
2371 if(s2->last_picture_ptr==NULL){
2372 /* Skip B-frames if we do not have reference frames and gop is not closed */
2373 if(s2->pict_type==FF_B_TYPE){
2377 /* Allocate a dummy frame */
2378 i= ff_find_unused_picture(s2, 0);
2379 s2->last_picture_ptr= &s2->picture[i];
2380 if(ff_alloc_picture(s2, s2->last_picture_ptr, 0) < 0)
2384 if(s2->next_picture_ptr==NULL){
2385 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2386 if(s2->pict_type==FF_P_TYPE && (s2->first_field || s2->picture_structure==PICT_FRAME)) break;
2388 /* Skip B-frames if we are in a hurry. */
2389 if(avctx->hurry_up && s2->pict_type==FF_B_TYPE) break;
2390 if( (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==FF_B_TYPE)
2391 ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=FF_I_TYPE)
2392 || avctx->skip_frame >= AVDISCARD_ALL)
2394 /* Skip everything if we are in a hurry>=5. */
2395 if(avctx->hurry_up>=5) break;
2397 if (!s->mpeg_enc_ctx_allocated) break;
2399 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2400 if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2405 av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2409 if(s2->first_slice){
2411 if(mpeg_field_start(s2, buf, buf_size) < 0)
2414 if(!s2->current_picture_ptr){
2415 av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2419 if (avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU) {
2424 if(avctx->thread_count > 1){
2425 int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2426 if(threshold <= mb_y){
2427 MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2429 thread_context->start_mb_y= mb_y;
2430 thread_context->end_mb_y = s2->mb_height;
2432 s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2433 ff_update_duplicate_context(thread_context, s2);
2435 init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2438 buf_ptr += 2; //FIXME add minimum number of bytes per slice
2440 ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2444 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2445 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);
2447 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);
2456 static int mpeg_decode_end(AVCodecContext *avctx)
2458 Mpeg1Context *s = avctx->priv_data;
2460 if (s->mpeg_enc_ctx_allocated)
2461 MPV_common_end(&s->mpeg_enc_ctx);
2465 AVCodec mpeg1video_decoder = {
2468 CODEC_ID_MPEG1VIDEO,
2469 sizeof(Mpeg1Context),
2474 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2475 .flush= ff_mpeg_flush,
2476 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2479 AVCodec mpeg2video_decoder = {
2482 CODEC_ID_MPEG2VIDEO,
2483 sizeof(Mpeg1Context),
2488 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2489 .flush= ff_mpeg_flush,
2490 .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2494 AVCodec mpegvideo_decoder = {
2497 CODEC_ID_MPEG2VIDEO,
2498 sizeof(Mpeg1Context),
2503 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2504 .flush= ff_mpeg_flush,
2505 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2508 #if CONFIG_MPEG_XVMC_DECODER
2509 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx){
2510 if( avctx->thread_count > 1)
2512 if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2514 if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2515 dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2517 mpeg_decode_init(avctx);
2519 avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2520 avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2525 AVCodec mpeg_xvmc_decoder = {
2528 CODEC_ID_MPEG2VIDEO_XVMC,
2529 sizeof(Mpeg1Context),
2530 mpeg_mc_decode_init,
2534 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2535 .flush= ff_mpeg_flush,
2536 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2541 #if CONFIG_MPEG_VDPAU_DECODER
2542 AVCodec mpeg_vdpau_decoder = {
2545 CODEC_ID_MPEG2VIDEO,
2546 sizeof(Mpeg1Context),
2551 CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2552 .flush= ff_mpeg_flush,
2553 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2557 #if CONFIG_MPEG1_VDPAU_DECODER
2558 AVCodec mpeg1_vdpau_decoder = {
2561 CODEC_ID_MPEG1VIDEO,
2562 sizeof(Mpeg1Context),
2567 CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2568 .flush= ff_mpeg_flush,
2569 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),