3 * Copyright (c) 2000, 2001 Fabrice Bellard
4 * Copyright (c) 2002-2013 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
28 #define UNCHECKED_BITSTREAM_READER 1
31 #include "libavutil/attributes.h"
32 #include "libavutil/imgutils.h"
33 #include "libavutil/internal.h"
34 #include "libavutil/stereo3d.h"
37 #include "bytestream.h"
38 #include "error_resilience.h"
43 #include "mpeg12data.h"
44 #include "mpegutils.h"
45 #include "mpegvideo.h"
46 #include "mpegvideodata.h"
50 #include "xvmc_internal.h"
52 typedef struct Mpeg1Context {
53 MpegEncContext mpeg_enc_ctx;
54 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
55 int repeat_field; /* true if we must repeat the field */
56 AVPanScan pan_scan; /* some temporary storage for the panscan */
64 AVRational save_aspect;
65 int save_width, save_height, save_progressive_seq;
66 AVRational frame_rate_ext; /* MPEG-2 specific framerate modificator */
67 int sync; /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
70 int extradata_decoded;
73 #define MB_TYPE_ZERO_MV 0x20000000
75 static const uint32_t ptype2mb_type[7] = {
77 MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
79 MB_TYPE_L0 | MB_TYPE_CBP,
80 MB_TYPE_QUANT | MB_TYPE_INTRA,
81 MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
82 MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
85 static const uint32_t btype2mb_type[11] = {
88 MB_TYPE_L1 | MB_TYPE_CBP,
90 MB_TYPE_L0 | MB_TYPE_CBP,
92 MB_TYPE_L0L1 | MB_TYPE_CBP,
93 MB_TYPE_QUANT | MB_TYPE_INTRA,
94 MB_TYPE_QUANT | MB_TYPE_L1 | MB_TYPE_CBP,
95 MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
96 MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
99 /* as H.263, but only 17 codes */
100 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
102 int code, sign, val, shift;
104 code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
110 sign = get_bits1(&s->gb);
114 val = (val - 1) << shift;
115 val |= get_bits(&s->gb, shift);
122 /* modulo decoding */
123 return sign_extend(val, 5 + shift);
126 #define MAX_INDEX (64 - 1)
127 #define check_scantable_index(ctx, x) \
129 if ((x) > MAX_INDEX) { \
130 av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", \
131 ctx->mb_x, ctx->mb_y); \
132 return AVERROR_INVALIDDATA; \
136 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
137 int16_t *block, int n)
139 int level, i, j, run;
140 RLTable *rl = &ff_rl_mpeg1;
141 uint8_t *const scantable = s->intra_scantable.permutated;
142 const uint16_t *quant_matrix = s->inter_matrix;
143 const int qscale = s->qscale;
146 OPEN_READER(re, &s->gb);
148 // special case for first coefficient, no need to add second VLC table
149 UPDATE_CACHE(re, &s->gb);
150 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
151 level = (3 * qscale * quant_matrix[0]) >> 5;
152 level = (level - 1) | 1;
153 if (GET_CACHE(re, &s->gb) & 0x40000000)
157 SKIP_BITS(re, &s->gb, 2);
158 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
161 /* now quantify & encode AC coefficients */
163 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
171 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
172 level = (level - 1) | 1;
173 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
174 SHOW_SBITS(re, &s->gb, 1);
175 SKIP_BITS(re, &s->gb, 1);
178 run = SHOW_UBITS(re, &s->gb, 6) + 1;
179 LAST_SKIP_BITS(re, &s->gb, 6);
180 UPDATE_CACHE(re, &s->gb);
181 level = SHOW_SBITS(re, &s->gb, 8);
182 SKIP_BITS(re, &s->gb, 8);
184 level = SHOW_UBITS(re, &s->gb, 8) - 256;
185 SKIP_BITS(re, &s->gb, 8);
186 } else if (level == 0) {
187 level = SHOW_UBITS(re, &s->gb, 8);
188 SKIP_BITS(re, &s->gb, 8);
196 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
197 level = (level - 1) | 1;
200 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
201 level = (level - 1) | 1;
206 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
208 UPDATE_CACHE(re, &s->gb);
211 LAST_SKIP_BITS(re, &s->gb, 2);
212 CLOSE_READER(re, &s->gb);
215 check_scantable_index(s, i);
217 s->block_last_index[n] = i;
222 * Note: this function can read out of range and crash for corrupt streams.
223 * Changing this would eat up any speed benefits it has.
224 * Do not use "fast" flag if you need the code to be robust.
226 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
227 int16_t *block, int n)
229 int level, i, j, run;
230 RLTable *rl = &ff_rl_mpeg1;
231 uint8_t *const scantable = s->intra_scantable.permutated;
232 const int qscale = s->qscale;
235 OPEN_READER(re, &s->gb);
237 // Special case for first coefficient, no need to add second VLC table.
238 UPDATE_CACHE(re, &s->gb);
239 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
240 level = (3 * qscale) >> 1;
241 level = (level - 1) | 1;
242 if (GET_CACHE(re, &s->gb) & 0x40000000)
246 SKIP_BITS(re, &s->gb, 2);
247 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
251 /* now quantify & encode AC coefficients */
253 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
261 level = ((level * 2 + 1) * qscale) >> 1;
262 level = (level - 1) | 1;
263 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
264 SHOW_SBITS(re, &s->gb, 1);
265 SKIP_BITS(re, &s->gb, 1);
268 run = SHOW_UBITS(re, &s->gb, 6) + 1;
269 LAST_SKIP_BITS(re, &s->gb, 6);
270 UPDATE_CACHE(re, &s->gb);
271 level = SHOW_SBITS(re, &s->gb, 8);
272 SKIP_BITS(re, &s->gb, 8);
274 level = SHOW_UBITS(re, &s->gb, 8) - 256;
275 SKIP_BITS(re, &s->gb, 8);
276 } else if (level == 0) {
277 level = SHOW_UBITS(re, &s->gb, 8);
278 SKIP_BITS(re, &s->gb, 8);
286 level = ((level * 2 + 1) * qscale) >> 1;
287 level = (level - 1) | 1;
290 level = ((level * 2 + 1) * qscale) >> 1;
291 level = (level - 1) | 1;
296 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
298 UPDATE_CACHE(re, &s->gb);
301 LAST_SKIP_BITS(re, &s->gb, 2);
302 CLOSE_READER(re, &s->gb);
305 check_scantable_index(s, i);
307 s->block_last_index[n] = i;
311 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
312 int16_t *block, int n)
314 int level, i, j, run;
315 RLTable *rl = &ff_rl_mpeg1;
316 uint8_t *const scantable = s->intra_scantable.permutated;
317 const uint16_t *quant_matrix;
318 const int qscale = s->qscale;
324 OPEN_READER(re, &s->gb);
327 quant_matrix = s->inter_matrix;
329 quant_matrix = s->chroma_inter_matrix;
331 // Special case for first coefficient, no need to add second VLC table.
332 UPDATE_CACHE(re, &s->gb);
333 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
334 level = (3 * qscale * quant_matrix[0]) >> 5;
335 if (GET_CACHE(re, &s->gb) & 0x40000000)
340 SKIP_BITS(re, &s->gb, 2);
341 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
345 /* now quantify & encode AC coefficients */
347 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
355 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
356 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
357 SHOW_SBITS(re, &s->gb, 1);
358 SKIP_BITS(re, &s->gb, 1);
361 run = SHOW_UBITS(re, &s->gb, 6) + 1;
362 LAST_SKIP_BITS(re, &s->gb, 6);
363 UPDATE_CACHE(re, &s->gb);
364 level = SHOW_SBITS(re, &s->gb, 12);
365 SKIP_BITS(re, &s->gb, 12);
372 level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
375 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
381 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
383 UPDATE_CACHE(re, &s->gb);
386 LAST_SKIP_BITS(re, &s->gb, 2);
387 CLOSE_READER(re, &s->gb);
389 block[63] ^= (mismatch & 1);
391 check_scantable_index(s, i);
393 s->block_last_index[n] = i;
398 * Note: this function can read out of range and crash for corrupt streams.
399 * Changing this would eat up any speed benefits it has.
400 * Do not use "fast" flag if you need the code to be robust.
402 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
403 int16_t *block, int n)
405 int level, i, j, run;
406 RLTable *rl = &ff_rl_mpeg1;
407 uint8_t *const scantable = s->intra_scantable.permutated;
408 const int qscale = s->qscale;
409 OPEN_READER(re, &s->gb);
412 // special case for first coefficient, no need to add second VLC table
413 UPDATE_CACHE(re, &s->gb);
414 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
415 level = (3 * qscale) >> 1;
416 if (GET_CACHE(re, &s->gb) & 0x40000000)
420 SKIP_BITS(re, &s->gb, 2);
421 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
425 /* now quantify & encode AC coefficients */
427 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
434 level = ((level * 2 + 1) * qscale) >> 1;
435 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
436 SHOW_SBITS(re, &s->gb, 1);
437 SKIP_BITS(re, &s->gb, 1);
440 run = SHOW_UBITS(re, &s->gb, 6) + 1;
441 LAST_SKIP_BITS(re, &s->gb, 6);
442 UPDATE_CACHE(re, &s->gb);
443 level = SHOW_SBITS(re, &s->gb, 12);
444 SKIP_BITS(re, &s->gb, 12);
451 level = ((-level * 2 + 1) * qscale) >> 1;
454 level = ((level * 2 + 1) * qscale) >> 1;
459 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
462 UPDATE_CACHE(re, &s->gb);
465 LAST_SKIP_BITS(re, &s->gb, 2);
466 CLOSE_READER(re, &s->gb);
468 check_scantable_index(s, i);
470 s->block_last_index[n] = i;
474 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
475 int16_t *block, int n)
477 int level, dc, diff, i, j, run;
480 uint8_t *const scantable = s->intra_scantable.permutated;
481 const uint16_t *quant_matrix;
482 const int qscale = s->qscale;
487 quant_matrix = s->intra_matrix;
490 quant_matrix = s->chroma_intra_matrix;
491 component = (n & 1) + 1;
493 diff = decode_dc(&s->gb, component);
495 return AVERROR_INVALIDDATA;
496 dc = s->last_dc[component];
498 s->last_dc[component] = dc;
499 block[0] = dc * (1 << (3 - s->intra_dc_precision));
500 ff_tlog(s->avctx, "dc=%d\n", block[0]);
501 mismatch = block[0] ^ 1;
503 if (s->intra_vlc_format)
509 OPEN_READER(re, &s->gb);
510 /* now quantify & encode AC coefficients */
512 UPDATE_CACHE(re, &s->gb);
513 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
518 } else if (level != 0) {
523 level = (level * qscale * quant_matrix[j]) >> 4;
524 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
525 SHOW_SBITS(re, &s->gb, 1);
526 LAST_SKIP_BITS(re, &s->gb, 1);
529 run = SHOW_UBITS(re, &s->gb, 6) + 1;
530 LAST_SKIP_BITS(re, &s->gb, 6);
531 UPDATE_CACHE(re, &s->gb);
532 level = SHOW_SBITS(re, &s->gb, 12);
533 SKIP_BITS(re, &s->gb, 12);
539 level = (-level * qscale * quant_matrix[j]) >> 4;
542 level = (level * qscale * quant_matrix[j]) >> 4;
549 CLOSE_READER(re, &s->gb);
551 block[63] ^= mismatch & 1;
553 check_scantable_index(s, i);
555 s->block_last_index[n] = i;
560 * Note: this function can read out of range and crash for corrupt streams.
561 * Changing this would eat up any speed benefits it has.
562 * Do not use "fast" flag if you need the code to be robust.
564 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
565 int16_t *block, int n)
567 int level, dc, diff, i, j, run;
570 uint8_t *const scantable = s->intra_scantable.permutated;
571 const uint16_t *quant_matrix;
572 const int qscale = s->qscale;
576 quant_matrix = s->intra_matrix;
579 quant_matrix = s->chroma_intra_matrix;
580 component = (n & 1) + 1;
582 diff = decode_dc(&s->gb, component);
584 return AVERROR_INVALIDDATA;
585 dc = s->last_dc[component];
587 s->last_dc[component] = dc;
588 block[0] = dc << (3 - s->intra_dc_precision);
590 if (s->intra_vlc_format)
596 OPEN_READER(re, &s->gb);
597 /* now quantify & encode AC coefficients */
599 UPDATE_CACHE(re, &s->gb);
600 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
603 if (level >= 64 || i > 63) {
605 } else if (level != 0) {
608 level = (level * qscale * quant_matrix[j]) >> 4;
609 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
610 SHOW_SBITS(re, &s->gb, 1);
611 LAST_SKIP_BITS(re, &s->gb, 1);
614 run = SHOW_UBITS(re, &s->gb, 6) + 1;
615 LAST_SKIP_BITS(re, &s->gb, 6);
616 UPDATE_CACHE(re, &s->gb);
617 level = SHOW_SBITS(re, &s->gb, 12);
618 SKIP_BITS(re, &s->gb, 12);
622 level = (-level * qscale * quant_matrix[j]) >> 4;
625 level = (level * qscale * quant_matrix[j]) >> 4;
631 CLOSE_READER(re, &s->gb);
634 check_scantable_index(s, i);
636 s->block_last_index[n] = i;
640 /******************************************/
643 static inline int get_dmv(MpegEncContext *s)
645 if (get_bits1(&s->gb))
646 return 1 - (get_bits1(&s->gb) << 1);
651 static inline int get_qscale(MpegEncContext *s)
653 int qscale = get_bits(&s->gb, 5);
655 return ff_mpeg2_non_linear_qscale[qscale];
661 /* motion type (for MPEG-2) */
667 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
669 int i, j, k, cbp, val, mb_type, motion_type;
670 const int mb_block_count = 4 + (1 << s->chroma_format);
673 ff_tlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
675 av_assert2(s->mb_skipped == 0);
677 if (s->mb_skip_run-- != 0) {
678 if (s->pict_type == AV_PICTURE_TYPE_P) {
680 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
681 MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
686 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
688 // FIXME not sure if this is allowed in MPEG at all
689 mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
690 if (IS_INTRA(mb_type)) {
691 av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
692 return AVERROR_INVALIDDATA;
694 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
695 mb_type | MB_TYPE_SKIP;
697 if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
704 switch (s->pict_type) {
706 case AV_PICTURE_TYPE_I:
707 if (get_bits1(&s->gb) == 0) {
708 if (get_bits1(&s->gb) == 0) {
709 av_log(s->avctx, AV_LOG_ERROR,
710 "Invalid mb type in I-frame at %d %d\n",
712 return AVERROR_INVALIDDATA;
714 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
716 mb_type = MB_TYPE_INTRA;
719 case AV_PICTURE_TYPE_P:
720 mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
722 av_log(s->avctx, AV_LOG_ERROR,
723 "Invalid mb type in P-frame at %d %d\n", s->mb_x, s->mb_y);
724 return AVERROR_INVALIDDATA;
726 mb_type = ptype2mb_type[mb_type];
728 case AV_PICTURE_TYPE_B:
729 mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
731 av_log(s->avctx, AV_LOG_ERROR,
732 "Invalid mb type in B-frame at %d %d\n", s->mb_x, s->mb_y);
733 return AVERROR_INVALIDDATA;
735 mb_type = btype2mb_type[mb_type];
738 ff_tlog(s->avctx, "mb_type=%x\n", mb_type);
739 // motion_type = 0; /* avoid warning */
740 if (IS_INTRA(mb_type)) {
741 s->bdsp.clear_blocks(s->block[0]);
743 if (!s->chroma_y_shift)
744 s->bdsp.clear_blocks(s->block[6]);
746 /* compute DCT type */
747 // FIXME: add an interlaced_dct coded var?
748 if (s->picture_structure == PICT_FRAME &&
749 !s->frame_pred_frame_dct)
750 s->interlaced_dct = get_bits1(&s->gb);
752 if (IS_QUANT(mb_type))
753 s->qscale = get_qscale(s);
755 if (s->concealment_motion_vectors) {
756 /* just parse them */
757 if (s->picture_structure != PICT_FRAME)
758 skip_bits1(&s->gb); /* field select */
761 s->last_mv[0][0][0] =
762 s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
763 s->last_mv[0][0][0]);
765 s->last_mv[0][0][1] =
766 s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
767 s->last_mv[0][0][1]);
769 check_marker(s->avctx, &s->gb, "after concealment_motion_vectors");
771 /* reset mv prediction */
772 memset(s->last_mv, 0, sizeof(s->last_mv));
775 // if 1, we memcpy blocks in xvmcvideo
776 if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
777 ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
779 if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
780 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
781 for (i = 0; i < 6; i++)
782 mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
784 for (i = 0; i < mb_block_count; i++)
785 if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
789 for (i = 0; i < 6; i++) {
790 ret = ff_mpeg1_decode_block_intra(&s->gb,
792 s->intra_scantable.permutated,
793 s->last_dc, *s->pblocks[i],
796 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
801 s->block_last_index[i] = ret;
805 if (mb_type & MB_TYPE_ZERO_MV) {
806 av_assert2(mb_type & MB_TYPE_CBP);
808 s->mv_dir = MV_DIR_FORWARD;
809 if (s->picture_structure == PICT_FRAME) {
810 if (s->picture_structure == PICT_FRAME
811 && !s->frame_pred_frame_dct)
812 s->interlaced_dct = get_bits1(&s->gb);
813 s->mv_type = MV_TYPE_16X16;
815 s->mv_type = MV_TYPE_FIELD;
816 mb_type |= MB_TYPE_INTERLACED;
817 s->field_select[0][0] = s->picture_structure - 1;
820 if (IS_QUANT(mb_type))
821 s->qscale = get_qscale(s);
823 s->last_mv[0][0][0] = 0;
824 s->last_mv[0][0][1] = 0;
825 s->last_mv[0][1][0] = 0;
826 s->last_mv[0][1][1] = 0;
830 av_assert2(mb_type & MB_TYPE_L0L1);
831 // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
832 /* get additional motion vector type */
833 if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
834 motion_type = MT_FRAME;
836 motion_type = get_bits(&s->gb, 2);
837 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
838 s->interlaced_dct = get_bits1(&s->gb);
841 if (IS_QUANT(mb_type))
842 s->qscale = get_qscale(s);
845 s->mv_dir = (mb_type >> 13) & 3;
846 ff_tlog(s->avctx, "motion_type=%d\n", motion_type);
847 switch (motion_type) {
848 case MT_FRAME: /* or MT_16X8 */
849 if (s->picture_structure == PICT_FRAME) {
850 mb_type |= MB_TYPE_16x16;
851 s->mv_type = MV_TYPE_16X16;
852 for (i = 0; i < 2; i++) {
853 if (USES_LIST(mb_type, i)) {
856 s->last_mv[i][0][0] =
857 s->last_mv[i][1][0] =
858 mpeg_decode_motion(s, s->mpeg_f_code[i][0],
859 s->last_mv[i][0][0]);
861 s->last_mv[i][0][1] =
862 s->last_mv[i][1][1] =
863 mpeg_decode_motion(s, s->mpeg_f_code[i][1],
864 s->last_mv[i][0][1]);
865 /* full_pel: only for MPEG-1 */
866 if (s->full_pel[i]) {
873 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
874 s->mv_type = MV_TYPE_16X8;
875 for (i = 0; i < 2; i++) {
876 if (USES_LIST(mb_type, i)) {
878 for (j = 0; j < 2; j++) {
879 s->field_select[i][j] = get_bits1(&s->gb);
880 for (k = 0; k < 2; k++) {
881 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
882 s->last_mv[i][j][k]);
883 s->last_mv[i][j][k] = val;
884 s->mv[i][j][k] = val;
892 s->mv_type = MV_TYPE_FIELD;
893 if (s->picture_structure == PICT_FRAME) {
894 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
895 for (i = 0; i < 2; i++) {
896 if (USES_LIST(mb_type, i)) {
897 for (j = 0; j < 2; j++) {
898 s->field_select[i][j] = get_bits1(&s->gb);
899 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
900 s->last_mv[i][j][0]);
901 s->last_mv[i][j][0] = val;
902 s->mv[i][j][0] = val;
903 ff_tlog(s->avctx, "fmx=%d\n", val);
904 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
905 s->last_mv[i][j][1] >> 1);
906 s->last_mv[i][j][1] = 2 * val;
907 s->mv[i][j][1] = val;
908 ff_tlog(s->avctx, "fmy=%d\n", val);
913 av_assert0(!s->progressive_sequence);
914 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
915 for (i = 0; i < 2; i++) {
916 if (USES_LIST(mb_type, i)) {
917 s->field_select[i][0] = get_bits1(&s->gb);
918 for (k = 0; k < 2; k++) {
919 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
920 s->last_mv[i][0][k]);
921 s->last_mv[i][0][k] = val;
922 s->last_mv[i][1][k] = val;
923 s->mv[i][0][k] = val;
930 if (s->progressive_sequence){
931 av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
932 return AVERROR_INVALIDDATA;
934 s->mv_type = MV_TYPE_DMV;
935 for (i = 0; i < 2; i++) {
936 if (USES_LIST(mb_type, i)) {
937 int dmx, dmy, mx, my, m;
938 const int my_shift = s->picture_structure == PICT_FRAME;
940 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
941 s->last_mv[i][0][0]);
942 s->last_mv[i][0][0] = mx;
943 s->last_mv[i][1][0] = mx;
945 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
946 s->last_mv[i][0][1] >> my_shift);
950 s->last_mv[i][0][1] = my * (1 << my_shift);
951 s->last_mv[i][1][1] = my * (1 << my_shift);
955 s->mv[i][1][0] = mx; // not used
956 s->mv[i][1][1] = my; // not used
958 if (s->picture_structure == PICT_FRAME) {
959 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
961 // m = 1 + 2 * s->top_field_first;
962 m = s->top_field_first ? 1 : 3;
964 /* top -> top pred */
965 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
966 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
968 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
969 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
971 mb_type |= MB_TYPE_16x16;
973 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
974 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
975 if (s->picture_structure == PICT_TOP_FIELD)
984 av_log(s->avctx, AV_LOG_ERROR,
985 "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
986 return AVERROR_INVALIDDATA;
991 if (HAS_CBP(mb_type)) {
992 s->bdsp.clear_blocks(s->block[0]);
994 cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
995 if (mb_block_count > 6) {
996 cbp *= 1 << mb_block_count - 6;
997 cbp |= get_bits(&s->gb, mb_block_count - 6);
998 s->bdsp.clear_blocks(s->block[6]);
1001 av_log(s->avctx, AV_LOG_ERROR,
1002 "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
1003 return AVERROR_INVALIDDATA;
1006 // if 1, we memcpy blocks in xvmcvideo
1007 if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1008 ff_xvmc_pack_pblocks(s, cbp);
1010 if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1011 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1012 for (i = 0; i < 6; i++) {
1014 mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1016 s->block_last_index[i] = -1;
1020 cbp <<= 12 - mb_block_count;
1022 for (i = 0; i < mb_block_count; i++) {
1023 if (cbp & (1 << 11)) {
1024 if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1027 s->block_last_index[i] = -1;
1033 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1034 for (i = 0; i < 6; i++) {
1036 mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1038 s->block_last_index[i] = -1;
1042 for (i = 0; i < 6; i++) {
1044 if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1047 s->block_last_index[i] = -1;
1054 for (i = 0; i < 12; i++)
1055 s->block_last_index[i] = -1;
1059 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1064 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1066 Mpeg1Context *s = avctx->priv_data;
1067 MpegEncContext *s2 = &s->mpeg_enc_ctx;
1069 ff_mpv_decode_defaults(s2);
1071 if ( avctx->codec_tag != AV_RL32("VCR2")
1072 && avctx->codec_tag != AV_RL32("BW10"))
1073 avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1074 ff_mpv_decode_init(s2, avctx);
1076 s->mpeg_enc_ctx.avctx = avctx;
1078 /* we need some permutation to store matrices,
1079 * until the decoder sets the real permutation. */
1080 ff_mpv_idct_init(s2);
1081 ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1082 ff_mpeg12_init_vlcs();
1084 s2->chroma_format = 1;
1085 s->mpeg_enc_ctx_allocated = 0;
1086 s->mpeg_enc_ctx.picture_number = 0;
1087 s->repeat_field = 0;
1088 s->mpeg_enc_ctx.codec_id = avctx->codec->id;
1089 avctx->color_range = AVCOL_RANGE_MPEG;
1094 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1095 const AVCodecContext *avctx_from)
1097 Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1098 MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1101 if (avctx == avctx_from ||
1102 !ctx_from->mpeg_enc_ctx_allocated ||
1103 !s1->context_initialized)
1106 err = ff_mpeg_update_thread_context(avctx, avctx_from);
1110 if (!ctx->mpeg_enc_ctx_allocated)
1111 memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1113 if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1114 s->picture_number++;
1120 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1121 const uint8_t *new_perm)
1123 uint16_t temp_matrix[64];
1126 memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1128 for (i = 0; i < 64; i++)
1129 matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1132 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1133 #if CONFIG_MPEG1_XVMC_HWACCEL
1136 #if CONFIG_MPEG1_VDPAU_HWACCEL
1143 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1144 #if CONFIG_MPEG2_XVMC_HWACCEL
1147 #if CONFIG_MPEG2_VDPAU_HWACCEL
1150 #if CONFIG_MPEG2_DXVA2_HWACCEL
1151 AV_PIX_FMT_DXVA2_VLD,
1153 #if CONFIG_MPEG2_D3D11VA_HWACCEL
1154 AV_PIX_FMT_D3D11VA_VLD,
1157 #if CONFIG_MPEG2_VAAPI_HWACCEL
1160 #if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
1161 AV_PIX_FMT_VIDEOTOOLBOX,
1167 static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1172 static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1177 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1179 Mpeg1Context *s1 = avctx->priv_data;
1180 MpegEncContext *s = &s1->mpeg_enc_ctx;
1181 const enum AVPixelFormat *pix_fmts;
1183 if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY))
1184 return AV_PIX_FMT_GRAY8;
1186 if (s->chroma_format < 2)
1187 pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1188 mpeg1_hwaccel_pixfmt_list_420 :
1189 mpeg2_hwaccel_pixfmt_list_420;
1190 else if (s->chroma_format == 2)
1191 pix_fmts = mpeg12_pixfmt_list_422;
1193 pix_fmts = mpeg12_pixfmt_list_444;
1195 return ff_thread_get_format(avctx, pix_fmts);
1198 static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1200 // until then pix_fmt may be changed right after codec init
1202 if (avctx->idct_algo == FF_IDCT_AUTO)
1203 avctx->idct_algo = FF_IDCT_NONE;
1205 if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1206 Mpeg1Context *s1 = avctx->priv_data;
1207 MpegEncContext *s = &s1->mpeg_enc_ctx;
1209 s->pack_pblocks = 1;
1213 /* Call this function when we know all parameters.
1214 * It may be called in different places for MPEG-1 and MPEG-2. */
1215 static int mpeg_decode_postinit(AVCodecContext *avctx)
1217 Mpeg1Context *s1 = avctx->priv_data;
1218 MpegEncContext *s = &s1->mpeg_enc_ctx;
1219 uint8_t old_permutation[64];
1222 if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1224 AVRational aspect_inv = av_d2q(ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1225 avctx->sample_aspect_ratio = (AVRational) { aspect_inv.den, aspect_inv.num };
1228 if (s->aspect_ratio_info > 1) {
1230 av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1231 (AVRational) { s1->pan_scan.width,
1232 s1->pan_scan.height }),
1233 (AVRational) { s->width, s->height });
1235 /* We ignore the spec here and guess a bit as reality does not
1236 * match the spec, see for example res_change_ffmpeg_aspect.ts
1237 * and sequence-display-aspect.mpg.
1238 * issue1613, 621, 562 */
1239 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1240 (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1241 av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1242 s->avctx->sample_aspect_ratio =
1243 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1244 (AVRational) { s->width, s->height });
1246 s->avctx->sample_aspect_ratio =
1247 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1248 (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1249 // issue1613 4/3 16/9 -> 16/9
1250 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1251 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1252 // s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1253 ff_dlog(avctx, "aspect A %d/%d\n",
1254 ff_mpeg2_aspect[s->aspect_ratio_info].num,
1255 ff_mpeg2_aspect[s->aspect_ratio_info].den);
1256 ff_dlog(avctx, "aspect B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1257 s->avctx->sample_aspect_ratio.den);
1260 s->avctx->sample_aspect_ratio =
1261 ff_mpeg2_aspect[s->aspect_ratio_info];
1265 if (av_image_check_sar(s->width, s->height,
1266 avctx->sample_aspect_ratio) < 0) {
1267 av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
1268 avctx->sample_aspect_ratio.num,
1269 avctx->sample_aspect_ratio.den);
1270 avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
1273 if ((s1->mpeg_enc_ctx_allocated == 0) ||
1274 avctx->coded_width != s->width ||
1275 avctx->coded_height != s->height ||
1276 s1->save_width != s->width ||
1277 s1->save_height != s->height ||
1278 av_cmp_q(s1->save_aspect, s->avctx->sample_aspect_ratio) ||
1279 (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1281 if (s1->mpeg_enc_ctx_allocated) {
1282 ParseContext pc = s->parse_context;
1283 s->parse_context.buffer = 0;
1284 ff_mpv_common_end(s);
1285 s->parse_context = pc;
1286 s1->mpeg_enc_ctx_allocated = 0;
1289 ret = ff_set_dimensions(avctx, s->width, s->height);
1293 if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1294 avctx->rc_max_rate = s->bit_rate;
1295 } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1296 (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1297 avctx->bit_rate = s->bit_rate;
1299 s1->save_aspect = s->avctx->sample_aspect_ratio;
1300 s1->save_width = s->width;
1301 s1->save_height = s->height;
1302 s1->save_progressive_seq = s->progressive_sequence;
1304 /* low_delay may be forced, in this case we will have B-frames
1305 * that behave like P-frames. */
1306 avctx->has_b_frames = !s->low_delay;
1308 if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1310 avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1311 avctx->ticks_per_frame = 1;
1313 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1316 av_reduce(&s->avctx->framerate.num,
1317 &s->avctx->framerate.den,
1318 ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1319 ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1321 avctx->ticks_per_frame = 2;
1323 switch (s->chroma_format) {
1324 case 1: avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; break;
1326 case 3: avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT; break;
1327 default: av_assert0(0);
1331 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1332 setup_hwaccel_for_pixfmt(avctx);
1334 /* Quantization matrices may need reordering
1335 * if DCT permutation is changed. */
1336 memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1338 ff_mpv_idct_init(s);
1339 if ((ret = ff_mpv_common_init(s)) < 0)
1342 quant_matrix_rebuild(s->intra_matrix, old_permutation, s->idsp.idct_permutation);
1343 quant_matrix_rebuild(s->inter_matrix, old_permutation, s->idsp.idct_permutation);
1344 quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1345 quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1347 s1->mpeg_enc_ctx_allocated = 1;
1352 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1355 Mpeg1Context *s1 = avctx->priv_data;
1356 MpegEncContext *s = &s1->mpeg_enc_ctx;
1357 int ref, f_code, vbv_delay;
1359 init_get_bits(&s->gb, buf, buf_size * 8);
1361 ref = get_bits(&s->gb, 10); /* temporal ref */
1362 s->pict_type = get_bits(&s->gb, 3);
1363 if (s->pict_type == 0 || s->pict_type > 3)
1364 return AVERROR_INVALIDDATA;
1366 vbv_delay = get_bits(&s->gb, 16);
1367 s->vbv_delay = vbv_delay;
1368 if (s->pict_type == AV_PICTURE_TYPE_P ||
1369 s->pict_type == AV_PICTURE_TYPE_B) {
1370 s->full_pel[0] = get_bits1(&s->gb);
1371 f_code = get_bits(&s->gb, 3);
1372 if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1373 return AVERROR_INVALIDDATA;
1375 s->mpeg_f_code[0][0] = f_code;
1376 s->mpeg_f_code[0][1] = f_code;
1378 if (s->pict_type == AV_PICTURE_TYPE_B) {
1379 s->full_pel[1] = get_bits1(&s->gb);
1380 f_code = get_bits(&s->gb, 3);
1381 if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1382 return AVERROR_INVALIDDATA;
1384 s->mpeg_f_code[1][0] = f_code;
1385 s->mpeg_f_code[1][1] = f_code;
1387 s->current_picture.f->pict_type = s->pict_type;
1388 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1390 if (avctx->debug & FF_DEBUG_PICT_INFO)
1391 av_log(avctx, AV_LOG_DEBUG,
1392 "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1399 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1401 MpegEncContext *s = &s1->mpeg_enc_ctx;
1402 int horiz_size_ext, vert_size_ext;
1405 skip_bits(&s->gb, 1); /* profile and level esc*/
1406 s->avctx->profile = get_bits(&s->gb, 3);
1407 s->avctx->level = get_bits(&s->gb, 4);
1408 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1409 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1411 if (!s->chroma_format) {
1412 s->chroma_format = 1;
1413 av_log(s->avctx, AV_LOG_WARNING, "Chroma format invalid\n");
1416 horiz_size_ext = get_bits(&s->gb, 2);
1417 vert_size_ext = get_bits(&s->gb, 2);
1418 s->width |= (horiz_size_ext << 12);
1419 s->height |= (vert_size_ext << 12);
1420 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1421 s->bit_rate += (bit_rate_ext << 18) * 400LL;
1422 check_marker(s->avctx, &s->gb, "after bit rate extension");
1423 s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1425 s->low_delay = get_bits1(&s->gb);
1426 if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
1429 s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1430 s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1432 ff_dlog(s->avctx, "sequence extension\n");
1433 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1435 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1436 av_log(s->avctx, AV_LOG_DEBUG,
1437 "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%"PRId64"\n",
1438 s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1439 s->avctx->rc_buffer_size, s->bit_rate);
1442 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1444 MpegEncContext *s = &s1->mpeg_enc_ctx;
1445 int color_description, w, h;
1447 skip_bits(&s->gb, 3); /* video format */
1448 color_description = get_bits1(&s->gb);
1449 if (color_description) {
1450 s->avctx->color_primaries = get_bits(&s->gb, 8);
1451 s->avctx->color_trc = get_bits(&s->gb, 8);
1452 s->avctx->colorspace = get_bits(&s->gb, 8);
1454 w = get_bits(&s->gb, 14);
1455 skip_bits(&s->gb, 1); // marker
1456 h = get_bits(&s->gb, 14);
1457 // remaining 3 bits are zero padding
1459 s1->pan_scan.width = 16 * w;
1460 s1->pan_scan.height = 16 * h;
1462 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1463 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1466 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1468 MpegEncContext *s = &s1->mpeg_enc_ctx;
1472 if (s->progressive_sequence) {
1473 if (s->repeat_first_field) {
1475 if (s->top_field_first)
1479 if (s->picture_structure == PICT_FRAME) {
1481 if (s->repeat_first_field)
1485 for (i = 0; i < nofco; i++) {
1486 s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1487 skip_bits(&s->gb, 1); // marker
1488 s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1489 skip_bits(&s->gb, 1); // marker
1492 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1493 av_log(s->avctx, AV_LOG_DEBUG,
1494 "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1495 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1496 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1497 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1500 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1501 uint16_t matrix1[64], int intra)
1505 for (i = 0; i < 64; i++) {
1506 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1507 int v = get_bits(&s->gb, 8);
1509 av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1510 return AVERROR_INVALIDDATA;
1512 if (intra && i == 0 && v != 8) {
1513 av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1514 v = 8; // needed by pink.mpg / issue1046
1523 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1525 ff_dlog(s->avctx, "matrix extension\n");
1527 if (get_bits1(&s->gb))
1528 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1529 if (get_bits1(&s->gb))
1530 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1531 if (get_bits1(&s->gb))
1532 load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1533 if (get_bits1(&s->gb))
1534 load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1537 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1539 MpegEncContext *s = &s1->mpeg_enc_ctx;
1541 s->full_pel[0] = s->full_pel[1] = 0;
1542 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1543 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1544 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1545 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1546 if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1547 av_log(s->avctx, AV_LOG_ERROR,
1548 "Missing picture start code, guessing missing values\n");
1549 if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1550 if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1551 s->pict_type = AV_PICTURE_TYPE_I;
1553 s->pict_type = AV_PICTURE_TYPE_P;
1555 s->pict_type = AV_PICTURE_TYPE_B;
1556 s->current_picture.f->pict_type = s->pict_type;
1557 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1559 s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1560 s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1561 s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1562 s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1564 s->intra_dc_precision = get_bits(&s->gb, 2);
1565 s->picture_structure = get_bits(&s->gb, 2);
1566 s->top_field_first = get_bits1(&s->gb);
1567 s->frame_pred_frame_dct = get_bits1(&s->gb);
1568 s->concealment_motion_vectors = get_bits1(&s->gb);
1569 s->q_scale_type = get_bits1(&s->gb);
1570 s->intra_vlc_format = get_bits1(&s->gb);
1571 s->alternate_scan = get_bits1(&s->gb);
1572 s->repeat_first_field = get_bits1(&s->gb);
1573 s->chroma_420_type = get_bits1(&s->gb);
1574 s->progressive_frame = get_bits1(&s->gb);
1576 if (s->alternate_scan) {
1577 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1578 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1580 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1581 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1584 /* composite display not parsed */
1585 ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1586 ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1587 ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1588 ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1589 ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1590 ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1591 ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1592 ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1593 ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1596 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1598 AVCodecContext *avctx = s->avctx;
1599 Mpeg1Context *s1 = (Mpeg1Context *) s;
1602 /* start frame decoding */
1603 if (s->first_field || s->picture_structure == PICT_FRAME) {
1604 AVFrameSideData *pan_scan;
1606 if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1609 ff_mpeg_er_frame_start(s);
1611 /* first check if we must repeat the frame */
1612 s->current_picture_ptr->f->repeat_pict = 0;
1613 if (s->repeat_first_field) {
1614 if (s->progressive_sequence) {
1615 if (s->top_field_first)
1616 s->current_picture_ptr->f->repeat_pict = 4;
1618 s->current_picture_ptr->f->repeat_pict = 2;
1619 } else if (s->progressive_frame) {
1620 s->current_picture_ptr->f->repeat_pict = 1;
1624 pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1625 AV_FRAME_DATA_PANSCAN,
1626 sizeof(s1->pan_scan));
1628 return AVERROR(ENOMEM);
1629 memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1631 if (s1->a53_caption) {
1632 AVFrameSideData *sd = av_frame_new_side_data(
1633 s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1634 s1->a53_caption_size);
1636 memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1637 av_freep(&s1->a53_caption);
1640 if (s1->has_stereo3d) {
1641 AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1643 return AVERROR(ENOMEM);
1645 *stereo = s1->stereo3d;
1646 s1->has_stereo3d = 0;
1650 AVFrameSideData *sd =
1651 av_frame_new_side_data(s->current_picture_ptr->f,
1652 AV_FRAME_DATA_AFD, 1);
1654 return AVERROR(ENOMEM);
1656 *sd->data = s1->afd;
1660 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1661 ff_thread_finish_setup(avctx);
1662 } else { // second field
1665 if (!s->current_picture_ptr) {
1666 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1667 return AVERROR_INVALIDDATA;
1670 if (s->avctx->hwaccel &&
1671 (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1672 if ((ret = s->avctx->hwaccel->end_frame(s->avctx)) < 0) {
1673 av_log(avctx, AV_LOG_ERROR,
1674 "hardware accelerator failed to decode first field\n");
1679 for (i = 0; i < 4; i++) {
1680 s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1681 if (s->picture_structure == PICT_BOTTOM_FIELD)
1682 s->current_picture.f->data[i] +=
1683 s->current_picture_ptr->f->linesize[i];
1687 if (avctx->hwaccel) {
1688 if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1695 #define DECODE_SLICE_ERROR -1
1696 #define DECODE_SLICE_OK 0
1700 * MpegEncContext.mb_y must be set to the MB row from the startcode.
1701 * @return DECODE_SLICE_ERROR if the slice is damaged,
1702 * DECODE_SLICE_OK if this slice is OK
1704 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1705 const uint8_t **buf, int buf_size)
1707 AVCodecContext *avctx = s->avctx;
1708 const int lowres = s->avctx->lowres;
1709 const int field_pic = s->picture_structure != PICT_FRAME;
1713 s->resync_mb_y = -1;
1715 av_assert0(mb_y < s->mb_height);
1717 init_get_bits(&s->gb, *buf, buf_size * 8);
1718 if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1719 skip_bits(&s->gb, 3);
1721 ff_mpeg1_clean_buffers(s);
1722 s->interlaced_dct = 0;
1724 s->qscale = get_qscale(s);
1726 if (s->qscale == 0) {
1727 av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1728 return AVERROR_INVALIDDATA;
1731 /* extra slice info */
1732 if (skip_1stop_8data_bits(&s->gb) < 0)
1733 return AVERROR_INVALIDDATA;
1737 if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1740 while (get_bits_left(&s->gb) > 0) {
1741 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1742 MBINCR_VLC_BITS, 2);
1744 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1745 return AVERROR_INVALIDDATA;
1750 /* otherwise, stuffing, nothing to do */
1758 if (s->mb_x >= (unsigned) s->mb_width) {
1759 av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1760 return AVERROR_INVALIDDATA;
1763 if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1764 const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1765 int start_code = -1;
1766 buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1767 if (buf_end < *buf + buf_size)
1770 if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1771 return DECODE_SLICE_ERROR;
1773 return DECODE_SLICE_OK;
1776 s->resync_mb_x = s->mb_x;
1777 s->resync_mb_y = s->mb_y = mb_y;
1779 ff_init_block_index(s);
1781 if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1782 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1783 av_log(s->avctx, AV_LOG_DEBUG,
1784 "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",
1786 s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1787 s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1788 s->pict_type == AV_PICTURE_TYPE_I ? "I" :
1789 (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1790 (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1791 s->progressive_sequence ? "ps" : "",
1792 s->progressive_frame ? "pf" : "",
1793 s->alternate_scan ? "alt" : "",
1794 s->top_field_first ? "top" : "",
1795 s->intra_dc_precision, s->picture_structure,
1796 s->frame_pred_frame_dct, s->concealment_motion_vectors,
1797 s->q_scale_type, s->intra_vlc_format,
1798 s->repeat_first_field, s->chroma_420_type ? "420" : "");
1803 // If 1, we memcpy blocks in xvmcvideo.
1804 if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1805 ff_xvmc_init_block(s); // set s->block
1807 if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1810 // Note motion_val is normally NULL unless we want to extract the MVs.
1811 if (s->current_picture.motion_val[0] && !s->encoding) {
1812 const int wrap = s->b8_stride;
1813 int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1814 int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1815 int motion_x, motion_y, dir, i;
1817 for (i = 0; i < 2; i++) {
1818 for (dir = 0; dir < 2; dir++) {
1820 (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1821 motion_x = motion_y = 0;
1822 } else if (s->mv_type == MV_TYPE_16X16 ||
1823 (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1824 motion_x = s->mv[dir][0][0];
1825 motion_y = s->mv[dir][0][1];
1826 } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1827 motion_x = s->mv[dir][i][0];
1828 motion_y = s->mv[dir][i][1];
1831 s->current_picture.motion_val[dir][xy][0] = motion_x;
1832 s->current_picture.motion_val[dir][xy][1] = motion_y;
1833 s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1834 s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1835 s->current_picture.ref_index [dir][b8_xy] =
1836 s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1837 av_assert2(s->field_select[dir][i] == 0 ||
1838 s->field_select[dir][i] == 1);
1845 s->dest[0] += 16 >> lowres;
1846 s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1847 s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1849 ff_mpv_reconstruct_mb(s, s->block);
1851 if (++s->mb_x >= s->mb_width) {
1852 const int mb_size = 16 >> s->avctx->lowres;
1855 ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1856 ff_mpv_report_decode_progress(s);
1859 s->mb_y += 1 << field_pic;
1861 if (s->mb_y >= s->mb_height) {
1862 int left = get_bits_left(&s->gb);
1863 int is_d10 = s->chroma_format == 2 &&
1864 s->pict_type == AV_PICTURE_TYPE_I &&
1865 avctx->profile == 0 && avctx->level == 5 &&
1866 s->intra_dc_precision == 2 &&
1867 s->q_scale_type == 1 && s->alternate_scan == 0 &&
1868 s->progressive_frame == 0
1869 /* vbv_delay == 0xBBB || 0xE10 */;
1871 if (left >= 32 && !is_d10) {
1872 GetBitContext gb = s->gb;
1873 align_get_bits(&gb);
1874 if (show_bits(&gb, 24) == 0x060E2B) {
1875 av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1878 if (left > 32 && show_bits_long(&gb, 32) == 0x201) {
1879 av_log(avctx, AV_LOG_DEBUG, "skipping m704 alpha (unsupported)\n");
1885 (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1886 ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1887 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X at %d %d\n",
1888 left, left>0 ? show_bits(&s->gb, FFMIN(left, 23)) : 0, s->mb_x, s->mb_y);
1889 return AVERROR_INVALIDDATA;
1893 // There are some files out there which are missing the last slice
1894 // in cases where the slice is completely outside the visible
1895 // area, we detect this here instead of running into the end expecting
1897 left = get_bits_left(&s->gb);
1898 if (s->mb_y >= ((s->height + 15) >> 4) &&
1899 !s->progressive_sequence &&
1902 s->mb_skip_run == -1 &&
1903 (!left || show_bits(&s->gb, left) == 0))
1906 ff_init_block_index(s);
1909 /* skip mb handling */
1910 if (s->mb_skip_run == -1) {
1911 /* read increment again */
1914 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1915 MBINCR_VLC_BITS, 2);
1917 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1918 return AVERROR_INVALIDDATA;
1922 s->mb_skip_run += 33;
1923 } else if (code == 35) {
1924 if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1925 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1926 return AVERROR_INVALIDDATA;
1928 goto eos; /* end of slice */
1930 /* otherwise, stuffing, nothing to do */
1932 s->mb_skip_run += code;
1936 if (s->mb_skip_run) {
1938 if (s->pict_type == AV_PICTURE_TYPE_I) {
1939 av_log(s->avctx, AV_LOG_ERROR,
1940 "skipped MB in I-frame at %d %d\n", s->mb_x, s->mb_y);
1941 return AVERROR_INVALIDDATA;
1946 for (i = 0; i < 12; i++)
1947 s->block_last_index[i] = -1;
1948 if (s->picture_structure == PICT_FRAME)
1949 s->mv_type = MV_TYPE_16X16;
1951 s->mv_type = MV_TYPE_FIELD;
1952 if (s->pict_type == AV_PICTURE_TYPE_P) {
1953 /* if P type, zero motion vector is implied */
1954 s->mv_dir = MV_DIR_FORWARD;
1955 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1956 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1957 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1958 s->field_select[0][0] = (s->picture_structure - 1) & 1;
1960 /* if B type, reuse previous vectors and directions */
1961 s->mv[0][0][0] = s->last_mv[0][0][0];
1962 s->mv[0][0][1] = s->last_mv[0][0][1];
1963 s->mv[1][0][0] = s->last_mv[1][0][0];
1964 s->mv[1][0][1] = s->last_mv[1][0][1];
1969 eos: // end of slice
1970 if (get_bits_left(&s->gb) < 0) {
1971 av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1972 return AVERROR_INVALIDDATA;
1974 *buf += (get_bits_count(&s->gb) - 1) / 8;
1975 ff_dlog(s, "Slice start:%d %d end:%d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1979 static int slice_decode_thread(AVCodecContext *c, void *arg)
1981 MpegEncContext *s = *(void **) arg;
1982 const uint8_t *buf = s->gb.buffer;
1983 int mb_y = s->start_mb_y;
1984 const int field_pic = s->picture_structure != PICT_FRAME;
1986 s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1989 uint32_t start_code;
1992 ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1994 ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1995 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1996 s->start_mb_y, s->end_mb_y, s->er.error_count);
1998 if (c->err_recognition & AV_EF_EXPLODE)
2000 if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2001 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2003 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2005 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2006 s->mb_x - 1, s->mb_y,
2007 ER_AC_END | ER_DC_END | ER_MV_END);
2010 if (s->mb_y == s->end_mb_y)
2014 buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2015 mb_y = start_code - SLICE_MIN_START_CODE;
2016 if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2017 mb_y += (*buf&0xE0)<<2;
2019 if (s->picture_structure == PICT_BOTTOM_FIELD)
2021 if (mb_y < 0 || mb_y >= s->end_mb_y)
2022 return AVERROR_INVALIDDATA;
2027 * Handle slice ends.
2028 * @return 1 if it seems to be the last slice
2030 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2032 Mpeg1Context *s1 = avctx->priv_data;
2033 MpegEncContext *s = &s1->mpeg_enc_ctx;
2035 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2038 if (s->avctx->hwaccel) {
2039 int ret = s->avctx->hwaccel->end_frame(s->avctx);
2041 av_log(avctx, AV_LOG_ERROR,
2042 "hardware accelerator failed to decode picture\n");
2047 /* end of slice reached */
2048 if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2051 ff_er_frame_end(&s->er);
2053 ff_mpv_frame_end(s);
2055 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2056 int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2059 ff_print_debug_info(s, s->current_picture_ptr, pict);
2060 ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2062 if (avctx->active_thread_type & FF_THREAD_FRAME)
2063 s->picture_number++;
2064 /* latency of 1 frame for I- and P-frames */
2065 /* XXX: use another variable than picture_number */
2066 if (s->last_picture_ptr) {
2067 int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2070 ff_print_debug_info(s, s->last_picture_ptr, pict);
2071 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2081 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2082 const uint8_t *buf, int buf_size)
2084 Mpeg1Context *s1 = avctx->priv_data;
2085 MpegEncContext *s = &s1->mpeg_enc_ctx;
2089 init_get_bits(&s->gb, buf, buf_size * 8);
2091 width = get_bits(&s->gb, 12);
2092 height = get_bits(&s->gb, 12);
2093 if (width == 0 || height == 0) {
2094 av_log(avctx, AV_LOG_WARNING,
2095 "Invalid horizontal or vertical size value.\n");
2096 if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2097 return AVERROR_INVALIDDATA;
2099 s->aspect_ratio_info = get_bits(&s->gb, 4);
2100 if (s->aspect_ratio_info == 0) {
2101 av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2102 if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2103 return AVERROR_INVALIDDATA;
2105 s->frame_rate_index = get_bits(&s->gb, 4);
2106 if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2107 av_log(avctx, AV_LOG_WARNING,
2108 "frame_rate_index %d is invalid\n", s->frame_rate_index);
2109 s->frame_rate_index = 1;
2111 s->bit_rate = get_bits(&s->gb, 18) * 400LL;
2112 if (check_marker(s->avctx, &s->gb, "in sequence header") == 0) {
2113 return AVERROR_INVALIDDATA;
2116 s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2117 skip_bits(&s->gb, 1);
2120 if (get_bits1(&s->gb)) {
2121 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2123 for (i = 0; i < 64; i++) {
2124 j = s->idsp.idct_permutation[i];
2125 v = ff_mpeg1_default_intra_matrix[i];
2126 s->intra_matrix[j] = v;
2127 s->chroma_intra_matrix[j] = v;
2130 if (get_bits1(&s->gb)) {
2131 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2133 for (i = 0; i < 64; i++) {
2134 int j = s->idsp.idct_permutation[i];
2135 v = ff_mpeg1_default_non_intra_matrix[i];
2136 s->inter_matrix[j] = v;
2137 s->chroma_inter_matrix[j] = v;
2141 if (show_bits(&s->gb, 23) != 0) {
2142 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2143 return AVERROR_INVALIDDATA;
2149 /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2150 s->progressive_sequence = 1;
2151 s->progressive_frame = 1;
2152 s->picture_structure = PICT_FRAME;
2154 s->frame_pred_frame_dct = 1;
2155 s->chroma_format = 1;
2157 s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2158 s->out_format = FMT_MPEG1;
2159 s->swap_uv = 0; // AFAIK VCR2 does not have SEQ_HEADER
2160 if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2163 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2164 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%"PRId64", aspect_ratio_info: %d \n",
2165 s->avctx->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2170 static int vcr2_init_sequence(AVCodecContext *avctx)
2172 Mpeg1Context *s1 = avctx->priv_data;
2173 MpegEncContext *s = &s1->mpeg_enc_ctx;
2176 /* start new MPEG-1 context decoding */
2177 s->out_format = FMT_MPEG1;
2178 if (s1->mpeg_enc_ctx_allocated) {
2179 ff_mpv_common_end(s);
2180 s1->mpeg_enc_ctx_allocated = 0;
2182 s->width = avctx->coded_width;
2183 s->height = avctx->coded_height;
2184 avctx->has_b_frames = 0; // true?
2187 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2188 setup_hwaccel_for_pixfmt(avctx);
2190 ff_mpv_idct_init(s);
2191 if ((ret = ff_mpv_common_init(s)) < 0)
2193 s1->mpeg_enc_ctx_allocated = 1;
2195 for (i = 0; i < 64; i++) {
2196 int j = s->idsp.idct_permutation[i];
2197 v = ff_mpeg1_default_intra_matrix[i];
2198 s->intra_matrix[j] = v;
2199 s->chroma_intra_matrix[j] = v;
2201 v = ff_mpeg1_default_non_intra_matrix[i];
2202 s->inter_matrix[j] = v;
2203 s->chroma_inter_matrix[j] = v;
2206 s->progressive_sequence = 1;
2207 s->progressive_frame = 1;
2208 s->picture_structure = PICT_FRAME;
2210 s->frame_pred_frame_dct = 1;
2211 s->chroma_format = 1;
2212 if (s->codec_tag == AV_RL32("BW10")) {
2213 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2215 s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2216 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2218 s1->save_width = s->width;
2219 s1->save_height = s->height;
2220 s1->save_progressive_seq = s->progressive_sequence;
2224 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2225 const uint8_t *p, int buf_size)
2227 Mpeg1Context *s1 = avctx->priv_data;
2229 if (buf_size >= 6 &&
2230 p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2231 p[4] == 3 && (p[5] & 0x40)) {
2232 /* extract A53 Part 4 CC data */
2233 int cc_count = p[5] & 0x1f;
2234 if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2235 av_freep(&s1->a53_caption);
2236 s1->a53_caption_size = cc_count * 3;
2237 s1->a53_caption = av_malloc(s1->a53_caption_size);
2238 if (s1->a53_caption)
2239 memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2240 avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2243 } else if (buf_size >= 11 &&
2244 p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2245 /* extract DVD CC data
2247 * uint32_t user_data_start_code 0x000001B2 (big endian)
2248 * uint16_t user_identifier 0x4343 "CC"
2249 * uint8_t user_data_type_code 0x01
2250 * uint8_t caption_block_size 0xF8
2252 * bit 7 caption_odd_field_first 1=odd field (CC1/CC2) first 0=even field (CC3/CC4) first
2253 * bit 6 caption_filler 0
2254 * bit 5:1 caption_block_count number of caption blocks (pairs of caption words = frames). Most DVDs use 15 per start of GOP.
2255 * bit 0 caption_extra_field_added 1=one additional caption word
2257 * struct caption_field_block {
2259 * bit 7:1 caption_filler 0x7F (all 1s)
2260 * bit 0 caption_field_odd 1=odd field (this is CC1/CC2) 0=even field (this is CC3/CC4)
2261 * uint8_t caption_first_byte
2262 * uint8_t caption_second_byte
2263 * } caption_block[(caption_block_count * 2) + caption_extra_field_added];
2265 * Some DVDs encode caption data for both fields with caption_field_odd=1. The only way to decode the fields
2266 * correctly is to start on the field indicated by caption_odd_field_first and count between odd/even fields.
2267 * Don't assume that the first caption word is the odd field. There do exist MPEG files in the wild that start
2268 * on the even field. There also exist DVDs in the wild that encode an odd field count and the
2269 * caption_extra_field_added/caption_odd_field_first bits change per packet to allow that. */
2272 // There is a caption count field in the data, but it is often
2273 // incorrect. So count the number of captions present.
2274 for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2276 // Transform the DVD format into A53 Part 4 format
2278 av_freep(&s1->a53_caption);
2279 s1->a53_caption_size = cc_count * 6;
2280 s1->a53_caption = av_malloc(s1->a53_caption_size);
2281 if (s1->a53_caption) {
2282 uint8_t field1 = !!(p[4] & 0x80);
2283 uint8_t *cap = s1->a53_caption;
2285 for (i = 0; i < cc_count; i++) {
2286 cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2289 cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2296 avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2303 static void mpeg_decode_user_data(AVCodecContext *avctx,
2304 const uint8_t *p, int buf_size)
2306 Mpeg1Context *s = avctx->priv_data;
2307 const uint8_t *buf_end = p + buf_size;
2308 Mpeg1Context *s1 = avctx->priv_data;
2312 for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2313 av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2315 av_log(avctx, AV_LOG_ERROR, "\n");
2321 if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2325 /* we parse the DTG active format information */
2326 if (buf_end - p >= 5 &&
2327 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2335 if (buf_end - p < 1)
2338 s1->afd = p[0] & 0x0f;
2340 } else if (buf_end - p >= 6 &&
2341 p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2342 p[4] == 0x03) { // S3D_video_format_length
2343 // the 0x7F mask ignores the reserved_bit value
2344 const uint8_t S3D_video_format_type = p[5] & 0x7F;
2346 if (S3D_video_format_type == 0x03 ||
2347 S3D_video_format_type == 0x04 ||
2348 S3D_video_format_type == 0x08 ||
2349 S3D_video_format_type == 0x23) {
2351 s1->has_stereo3d = 1;
2353 switch (S3D_video_format_type) {
2355 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2358 s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2361 s1->stereo3d.type = AV_STEREO3D_2D;
2364 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2368 } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2373 static void mpeg_decode_gop(AVCodecContext *avctx,
2374 const uint8_t *buf, int buf_size)
2376 Mpeg1Context *s1 = avctx->priv_data;
2377 MpegEncContext *s = &s1->mpeg_enc_ctx;
2381 init_get_bits(&s->gb, buf, buf_size * 8);
2383 tc = s-> timecode_frame_start = get_bits(&s->gb, 25);
2385 #if FF_API_PRIVATE_OPT
2386 FF_DISABLE_DEPRECATION_WARNINGS
2387 avctx->timecode_frame_start = tc;
2388 FF_ENABLE_DEPRECATION_WARNINGS
2391 s->closed_gop = get_bits1(&s->gb);
2392 /* broken_link indicates that after editing the
2393 * reference frames of the first B-Frames after GOP I-Frame
2394 * are missing (open gop) */
2395 broken_link = get_bits1(&s->gb);
2397 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2398 char tcbuf[AV_TIMECODE_STR_SIZE];
2399 av_timecode_make_mpeg_tc_string(tcbuf, tc);
2400 av_log(s->avctx, AV_LOG_DEBUG,
2401 "GOP (%s) closed_gop=%d broken_link=%d\n",
2402 tcbuf, s->closed_gop, broken_link);
2406 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2407 int *got_output, const uint8_t *buf, int buf_size)
2409 Mpeg1Context *s = avctx->priv_data;
2410 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2411 const uint8_t *buf_ptr = buf;
2412 const uint8_t *buf_end = buf + buf_size;
2413 int ret, input_size;
2414 int last_code = 0, skip_frame = 0;
2415 int picture_start_code_seen = 0;
2418 /* find next start code */
2419 uint32_t start_code = -1;
2420 buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2421 if (start_code > 0x1ff) {
2424 (avctx->active_thread_type & FF_THREAD_SLICE) &&
2427 av_assert0(avctx->thread_count > 1);
2429 avctx->execute(avctx, slice_decode_thread,
2430 &s2->thread_context[0], NULL,
2431 s->slice_count, sizeof(void *));
2432 for (i = 0; i < s->slice_count; i++)
2433 s2->er.error_count += s2->thread_context[i]->er.error_count;
2436 ret = slice_end(avctx, picture);
2440 // FIXME: merge with the stuff in mpeg_decode_slice
2441 if (s2->last_picture_ptr || s2->low_delay)
2447 if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2448 return AVERROR_INVALIDDATA;
2450 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2453 input_size = buf_end - buf_ptr;
2455 if (avctx->debug & FF_DEBUG_STARTCODE)
2456 av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2457 start_code, buf_ptr - buf, input_size);
2459 /* prepare data for next start code */
2460 switch (start_code) {
2461 case SEQ_START_CODE:
2462 if (last_code == 0) {
2463 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2464 if (buf != avctx->extradata)
2467 av_log(avctx, AV_LOG_ERROR,
2468 "ignoring SEQ_START_CODE after %X\n", last_code);
2469 if (avctx->err_recognition & AV_EF_EXPLODE)
2470 return AVERROR_INVALIDDATA;
2474 case PICTURE_START_CODE:
2475 if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2476 /* If it's a frame picture, there can't be more than one picture header.
2477 Yet, it does happen and we need to handle it. */
2478 av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2481 picture_start_code_seen = 1;
2483 if (s2->width <= 0 || s2->height <= 0) {
2484 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2485 s2->width, s2->height);
2486 return AVERROR_INVALIDDATA;
2490 s2->intra_dc_precision= 3;
2491 s2->intra_matrix[0]= 1;
2493 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2494 !avctx->hwaccel && s->slice_count) {
2497 avctx->execute(avctx, slice_decode_thread,
2498 s2->thread_context, NULL,
2499 s->slice_count, sizeof(void *));
2500 for (i = 0; i < s->slice_count; i++)
2501 s2->er.error_count += s2->thread_context[i]->er.error_count;
2504 if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2505 ret = mpeg_decode_postinit(avctx);
2507 av_log(avctx, AV_LOG_ERROR,
2508 "mpeg_decode_postinit() failure\n");
2512 /* We have a complete image: we try to decompress it. */
2513 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2516 last_code = PICTURE_START_CODE;
2518 av_log(avctx, AV_LOG_ERROR,
2519 "ignoring pic after %X\n", last_code);
2520 if (avctx->err_recognition & AV_EF_EXPLODE)
2521 return AVERROR_INVALIDDATA;
2524 case EXT_START_CODE:
2525 init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2527 switch (get_bits(&s2->gb, 4)) {
2529 if (last_code == 0) {
2530 mpeg_decode_sequence_extension(s);
2532 av_log(avctx, AV_LOG_ERROR,
2533 "ignoring seq ext after %X\n", last_code);
2534 if (avctx->err_recognition & AV_EF_EXPLODE)
2535 return AVERROR_INVALIDDATA;
2539 mpeg_decode_sequence_display_extension(s);
2542 mpeg_decode_quant_matrix_extension(s2);
2545 mpeg_decode_picture_display_extension(s);
2548 if (last_code == PICTURE_START_CODE) {
2549 mpeg_decode_picture_coding_extension(s);
2551 av_log(avctx, AV_LOG_ERROR,
2552 "ignoring pic cod ext after %X\n", last_code);
2553 if (avctx->err_recognition & AV_EF_EXPLODE)
2554 return AVERROR_INVALIDDATA;
2559 case USER_START_CODE:
2560 mpeg_decode_user_data(avctx, buf_ptr, input_size);
2562 case GOP_START_CODE:
2563 if (last_code == 0) {
2564 s2->first_field = 0;
2565 mpeg_decode_gop(avctx, buf_ptr, input_size);
2568 av_log(avctx, AV_LOG_ERROR,
2569 "ignoring GOP_START_CODE after %X\n", last_code);
2570 if (avctx->err_recognition & AV_EF_EXPLODE)
2571 return AVERROR_INVALIDDATA;
2575 if (start_code >= SLICE_MIN_START_CODE &&
2576 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2577 if (s2->progressive_sequence && !s2->progressive_frame) {
2578 s2->progressive_frame = 1;
2579 av_log(s2->avctx, AV_LOG_ERROR,
2580 "interlaced frame in progressive sequence, ignoring\n");
2583 if (s2->picture_structure == 0 ||
2584 (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2585 av_log(s2->avctx, AV_LOG_ERROR,
2586 "picture_structure %d invalid, ignoring\n",
2587 s2->picture_structure);
2588 s2->picture_structure = PICT_FRAME;
2591 if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2592 av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2594 if (s2->picture_structure == PICT_FRAME) {
2595 s2->first_field = 0;
2596 s2->v_edge_pos = 16 * s2->mb_height;
2598 s2->first_field ^= 1;
2599 s2->v_edge_pos = 8 * s2->mb_height;
2600 memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2603 if (start_code >= SLICE_MIN_START_CODE &&
2604 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2605 const int field_pic = s2->picture_structure != PICT_FRAME;
2606 int mb_y = start_code - SLICE_MIN_START_CODE;
2607 last_code = SLICE_MIN_START_CODE;
2608 if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2609 mb_y += (*buf_ptr&0xE0)<<2;
2612 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2615 if (buf_end - buf_ptr < 2) {
2616 av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2617 return AVERROR_INVALIDDATA;
2620 if (mb_y >= s2->mb_height) {
2621 av_log(s2->avctx, AV_LOG_ERROR,
2622 "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2623 return AVERROR_INVALIDDATA;
2626 if (!s2->last_picture_ptr) {
2627 /* Skip B-frames if we do not have reference frames and
2628 * GOP is not closed. */
2629 if (s2->pict_type == AV_PICTURE_TYPE_B) {
2630 if (!s2->closed_gop) {
2632 av_log(s2->avctx, AV_LOG_DEBUG,
2633 "Skipping B slice due to open GOP\n");
2638 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL))
2640 if (!s2->next_picture_ptr) {
2641 /* Skip P-frames if we do not have a reference frame or
2642 * we have an invalid header. */
2643 if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2645 av_log(s2->avctx, AV_LOG_DEBUG,
2646 "Skipping P slice due to !sync\n");
2650 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2651 s2->pict_type == AV_PICTURE_TYPE_B) ||
2652 (avctx->skip_frame >= AVDISCARD_NONKEY &&
2653 s2->pict_type != AV_PICTURE_TYPE_I) ||
2654 avctx->skip_frame >= AVDISCARD_ALL) {
2659 if (!s->mpeg_enc_ctx_allocated)
2662 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2663 if (mb_y < avctx->skip_top ||
2664 mb_y >= s2->mb_height - avctx->skip_bottom)
2668 if (!s2->pict_type) {
2669 av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2670 if (avctx->err_recognition & AV_EF_EXPLODE)
2671 return AVERROR_INVALIDDATA;
2675 if (s->first_slice) {
2678 if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2681 if (!s2->current_picture_ptr) {
2682 av_log(avctx, AV_LOG_ERROR,
2683 "current_picture not initialized\n");
2684 return AVERROR_INVALIDDATA;
2688 (avctx->active_thread_type & FF_THREAD_SLICE) &&
2690 int threshold = (s2->mb_height * s->slice_count +
2691 s2->slice_context_count / 2) /
2692 s2->slice_context_count;
2693 av_assert0(avctx->thread_count > 1);
2694 if (threshold <= mb_y) {
2695 MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2697 thread_context->start_mb_y = mb_y;
2698 thread_context->end_mb_y = s2->mb_height;
2699 if (s->slice_count) {
2700 s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2701 ret = ff_update_duplicate_context(thread_context, s2);
2705 init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2708 buf_ptr += 2; // FIXME add minimum number of bytes per slice
2710 ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2714 if (avctx->err_recognition & AV_EF_EXPLODE)
2716 if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2717 ff_er_add_slice(&s2->er, s2->resync_mb_x,
2718 s2->resync_mb_y, s2->mb_x, s2->mb_y,
2719 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2721 ff_er_add_slice(&s2->er, s2->resync_mb_x,
2722 s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2723 ER_AC_END | ER_DC_END | ER_MV_END);
2732 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2733 int *got_output, AVPacket *avpkt)
2735 const uint8_t *buf = avpkt->data;
2737 int buf_size = avpkt->size;
2738 Mpeg1Context *s = avctx->priv_data;
2739 AVFrame *picture = data;
2740 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2742 if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2743 /* special case for last picture */
2744 if (s2->low_delay == 0 && s2->next_picture_ptr) {
2745 int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2749 s2->next_picture_ptr = NULL;
2756 if (s2->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
2757 int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2760 if (ff_combine_frame(&s2->parse_context, next,
2761 (const uint8_t **) &buf, &buf_size) < 0)
2765 s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2766 if (s->mpeg_enc_ctx_allocated == 0 && ( s2->codec_tag == AV_RL32("VCR2")
2767 || s2->codec_tag == AV_RL32("BW10")
2769 vcr2_init_sequence(avctx);
2773 if (avctx->extradata && !s->extradata_decoded) {
2774 ret = decode_chunks(avctx, picture, got_output,
2775 avctx->extradata, avctx->extradata_size);
2777 av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2778 av_frame_unref(picture);
2781 s->extradata_decoded = 1;
2782 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2783 s2->current_picture_ptr = NULL;
2788 ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2789 if (ret<0 || *got_output) {
2790 s2->current_picture_ptr = NULL;
2792 if (s2->timecode_frame_start != -1 && *got_output) {
2793 AVFrameSideData *tcside = av_frame_new_side_data(picture,
2794 AV_FRAME_DATA_GOP_TIMECODE,
2797 return AVERROR(ENOMEM);
2798 memcpy(tcside->data, &s2->timecode_frame_start, sizeof(int64_t));
2800 s2->timecode_frame_start = -1;
2807 static void flush(AVCodecContext *avctx)
2809 Mpeg1Context *s = avctx->priv_data;
2813 ff_mpeg_flush(avctx);
2816 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2818 Mpeg1Context *s = avctx->priv_data;
2820 if (s->mpeg_enc_ctx_allocated)
2821 ff_mpv_common_end(&s->mpeg_enc_ctx);
2822 av_freep(&s->a53_caption);
2826 AVCodec ff_mpeg1video_decoder = {
2827 .name = "mpeg1video",
2828 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2829 .type = AVMEDIA_TYPE_VIDEO,
2830 .id = AV_CODEC_ID_MPEG1VIDEO,
2831 .priv_data_size = sizeof(Mpeg1Context),
2832 .init = mpeg_decode_init,
2833 .close = mpeg_decode_end,
2834 .decode = mpeg_decode_frame,
2835 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2836 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2837 AV_CODEC_CAP_SLICE_THREADS,
2838 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2841 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2844 AVCodec ff_mpeg2video_decoder = {
2845 .name = "mpeg2video",
2846 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2847 .type = AVMEDIA_TYPE_VIDEO,
2848 .id = AV_CODEC_ID_MPEG2VIDEO,
2849 .priv_data_size = sizeof(Mpeg1Context),
2850 .init = mpeg_decode_init,
2851 .close = mpeg_decode_end,
2852 .decode = mpeg_decode_frame,
2853 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2854 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2855 AV_CODEC_CAP_SLICE_THREADS,
2856 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2859 .profiles = NULL_IF_CONFIG_SMALL(ff_mpeg2_video_profiles),
2863 AVCodec ff_mpegvideo_decoder = {
2864 .name = "mpegvideo",
2865 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2866 .type = AVMEDIA_TYPE_VIDEO,
2867 .id = AV_CODEC_ID_MPEG2VIDEO,
2868 .priv_data_size = sizeof(Mpeg1Context),
2869 .init = mpeg_decode_init,
2870 .close = mpeg_decode_end,
2871 .decode = mpeg_decode_frame,
2872 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
2873 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,