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"
44 #include "mpeg12data.h"
45 #include "mpegutils.h"
46 #include "mpegvideo.h"
47 #include "mpegvideodata.h"
51 #include "xvmc_internal.h"
53 typedef struct Mpeg1Context {
54 MpegEncContext mpeg_enc_ctx;
55 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
56 int repeat_field; /* true if we must repeat the field */
57 AVPanScan pan_scan; /* some temporary storage for the panscan */
65 AVRational save_aspect;
66 int save_width, save_height, save_progressive_seq;
68 AVRational frame_rate_ext; /* MPEG-2 specific framerate modificator */
69 int sync; /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
72 int extradata_decoded;
75 #define MB_TYPE_ZERO_MV 0x20000000
77 static const uint32_t ptype2mb_type[7] = {
79 MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
81 MB_TYPE_L0 | MB_TYPE_CBP,
82 MB_TYPE_QUANT | MB_TYPE_INTRA,
83 MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
84 MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
87 static const uint32_t btype2mb_type[11] = {
90 MB_TYPE_L1 | MB_TYPE_CBP,
92 MB_TYPE_L0 | MB_TYPE_CBP,
94 MB_TYPE_L0L1 | MB_TYPE_CBP,
95 MB_TYPE_QUANT | MB_TYPE_INTRA,
96 MB_TYPE_QUANT | MB_TYPE_L1 | MB_TYPE_CBP,
97 MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
98 MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
101 /* as H.263, but only 17 codes */
102 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
104 int code, sign, val, shift;
106 code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
112 sign = get_bits1(&s->gb);
116 val = (val - 1) << shift;
117 val |= get_bits(&s->gb, shift);
124 /* modulo decoding */
125 return sign_extend(val, 5 + shift);
128 #define MAX_INDEX (64 - 1)
129 #define check_scantable_index(ctx, x) \
131 if ((x) > MAX_INDEX) { \
132 av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", \
133 ctx->mb_x, ctx->mb_y); \
134 return AVERROR_INVALIDDATA; \
138 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
139 int16_t *block, int n)
141 int level, i, j, run;
142 RLTable *rl = &ff_rl_mpeg1;
143 uint8_t *const scantable = s->intra_scantable.permutated;
144 const uint16_t *quant_matrix = s->inter_matrix;
145 const int qscale = s->qscale;
148 OPEN_READER(re, &s->gb);
150 // special case for first coefficient, no need to add second VLC table
151 UPDATE_CACHE(re, &s->gb);
152 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
153 level = (3 * qscale * quant_matrix[0]) >> 5;
154 level = (level - 1) | 1;
155 if (GET_CACHE(re, &s->gb) & 0x40000000)
159 SKIP_BITS(re, &s->gb, 2);
160 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
163 /* now quantify & encode AC coefficients */
165 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
173 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
174 level = (level - 1) | 1;
175 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
176 SHOW_SBITS(re, &s->gb, 1);
177 SKIP_BITS(re, &s->gb, 1);
180 run = SHOW_UBITS(re, &s->gb, 6) + 1;
181 LAST_SKIP_BITS(re, &s->gb, 6);
182 UPDATE_CACHE(re, &s->gb);
183 level = SHOW_SBITS(re, &s->gb, 8);
184 SKIP_BITS(re, &s->gb, 8);
186 level = SHOW_UBITS(re, &s->gb, 8) - 256;
187 SKIP_BITS(re, &s->gb, 8);
188 } else if (level == 0) {
189 level = SHOW_UBITS(re, &s->gb, 8);
190 SKIP_BITS(re, &s->gb, 8);
198 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
199 level = (level - 1) | 1;
202 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
203 level = (level - 1) | 1;
208 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
210 UPDATE_CACHE(re, &s->gb);
213 LAST_SKIP_BITS(re, &s->gb, 2);
214 CLOSE_READER(re, &s->gb);
217 check_scantable_index(s, i);
219 s->block_last_index[n] = i;
224 * Note: this function can read out of range and crash for corrupt streams.
225 * Changing this would eat up any speed benefits it has.
226 * Do not use "fast" flag if you need the code to be robust.
228 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
229 int16_t *block, int n)
231 int level, i, j, run;
232 RLTable *rl = &ff_rl_mpeg1;
233 uint8_t *const scantable = s->intra_scantable.permutated;
234 const int qscale = s->qscale;
237 OPEN_READER(re, &s->gb);
239 // Special case for first coefficient, no need to add second VLC table.
240 UPDATE_CACHE(re, &s->gb);
241 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
242 level = (3 * qscale) >> 1;
243 level = (level - 1) | 1;
244 if (GET_CACHE(re, &s->gb) & 0x40000000)
248 SKIP_BITS(re, &s->gb, 2);
249 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
253 /* now quantify & encode AC coefficients */
255 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
263 level = ((level * 2 + 1) * qscale) >> 1;
264 level = (level - 1) | 1;
265 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
266 SHOW_SBITS(re, &s->gb, 1);
267 SKIP_BITS(re, &s->gb, 1);
270 run = SHOW_UBITS(re, &s->gb, 6) + 1;
271 LAST_SKIP_BITS(re, &s->gb, 6);
272 UPDATE_CACHE(re, &s->gb);
273 level = SHOW_SBITS(re, &s->gb, 8);
274 SKIP_BITS(re, &s->gb, 8);
276 level = SHOW_UBITS(re, &s->gb, 8) - 256;
277 SKIP_BITS(re, &s->gb, 8);
278 } else if (level == 0) {
279 level = SHOW_UBITS(re, &s->gb, 8);
280 SKIP_BITS(re, &s->gb, 8);
288 level = ((level * 2 + 1) * qscale) >> 1;
289 level = (level - 1) | 1;
292 level = ((level * 2 + 1) * qscale) >> 1;
293 level = (level - 1) | 1;
298 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
300 UPDATE_CACHE(re, &s->gb);
303 LAST_SKIP_BITS(re, &s->gb, 2);
304 CLOSE_READER(re, &s->gb);
307 check_scantable_index(s, i);
309 s->block_last_index[n] = i;
313 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
314 int16_t *block, int n)
316 int level, i, j, run;
317 RLTable *rl = &ff_rl_mpeg1;
318 uint8_t *const scantable = s->intra_scantable.permutated;
319 const uint16_t *quant_matrix;
320 const int qscale = s->qscale;
326 OPEN_READER(re, &s->gb);
329 quant_matrix = s->inter_matrix;
331 quant_matrix = s->chroma_inter_matrix;
333 // Special case for first coefficient, no need to add second VLC table.
334 UPDATE_CACHE(re, &s->gb);
335 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
336 level = (3 * qscale * quant_matrix[0]) >> 5;
337 if (GET_CACHE(re, &s->gb) & 0x40000000)
342 SKIP_BITS(re, &s->gb, 2);
343 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
347 /* now quantify & encode AC coefficients */
349 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
357 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
358 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
359 SHOW_SBITS(re, &s->gb, 1);
360 SKIP_BITS(re, &s->gb, 1);
363 run = SHOW_UBITS(re, &s->gb, 6) + 1;
364 LAST_SKIP_BITS(re, &s->gb, 6);
365 UPDATE_CACHE(re, &s->gb);
366 level = SHOW_SBITS(re, &s->gb, 12);
367 SKIP_BITS(re, &s->gb, 12);
374 level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
377 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
383 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
385 UPDATE_CACHE(re, &s->gb);
388 LAST_SKIP_BITS(re, &s->gb, 2);
389 CLOSE_READER(re, &s->gb);
391 block[63] ^= (mismatch & 1);
393 check_scantable_index(s, i);
395 s->block_last_index[n] = i;
400 * Note: this function can read out of range and crash for corrupt streams.
401 * Changing this would eat up any speed benefits it has.
402 * Do not use "fast" flag if you need the code to be robust.
404 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
405 int16_t *block, int n)
407 int level, i, j, run;
408 RLTable *rl = &ff_rl_mpeg1;
409 uint8_t *const scantable = s->intra_scantable.permutated;
410 const int qscale = s->qscale;
411 OPEN_READER(re, &s->gb);
414 // special case for first coefficient, no need to add second VLC table
415 UPDATE_CACHE(re, &s->gb);
416 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
417 level = (3 * qscale) >> 1;
418 if (GET_CACHE(re, &s->gb) & 0x40000000)
422 SKIP_BITS(re, &s->gb, 2);
423 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
427 /* now quantify & encode AC coefficients */
429 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
436 level = ((level * 2 + 1) * qscale) >> 1;
437 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
438 SHOW_SBITS(re, &s->gb, 1);
439 SKIP_BITS(re, &s->gb, 1);
442 run = SHOW_UBITS(re, &s->gb, 6) + 1;
443 LAST_SKIP_BITS(re, &s->gb, 6);
444 UPDATE_CACHE(re, &s->gb);
445 level = SHOW_SBITS(re, &s->gb, 12);
446 SKIP_BITS(re, &s->gb, 12);
453 level = ((-level * 2 + 1) * qscale) >> 1;
456 level = ((level * 2 + 1) * qscale) >> 1;
461 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
464 UPDATE_CACHE(re, &s->gb);
467 LAST_SKIP_BITS(re, &s->gb, 2);
468 CLOSE_READER(re, &s->gb);
470 check_scantable_index(s, i);
472 s->block_last_index[n] = i;
476 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
477 int16_t *block, int n)
479 int level, dc, diff, i, j, run;
482 uint8_t *const scantable = s->intra_scantable.permutated;
483 const uint16_t *quant_matrix;
484 const int qscale = s->qscale;
489 quant_matrix = s->intra_matrix;
492 quant_matrix = s->chroma_intra_matrix;
493 component = (n & 1) + 1;
495 diff = decode_dc(&s->gb, component);
497 return AVERROR_INVALIDDATA;
498 dc = s->last_dc[component];
500 s->last_dc[component] = dc;
501 block[0] = dc * (1 << (3 - s->intra_dc_precision));
502 ff_tlog(s->avctx, "dc=%d\n", block[0]);
503 mismatch = block[0] ^ 1;
505 if (s->intra_vlc_format)
511 OPEN_READER(re, &s->gb);
512 /* now quantify & encode AC coefficients */
514 UPDATE_CACHE(re, &s->gb);
515 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
520 } else if (level != 0) {
525 level = (level * qscale * quant_matrix[j]) >> 4;
526 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
527 SHOW_SBITS(re, &s->gb, 1);
528 LAST_SKIP_BITS(re, &s->gb, 1);
531 run = SHOW_UBITS(re, &s->gb, 6) + 1;
532 LAST_SKIP_BITS(re, &s->gb, 6);
533 UPDATE_CACHE(re, &s->gb);
534 level = SHOW_SBITS(re, &s->gb, 12);
535 SKIP_BITS(re, &s->gb, 12);
541 level = (-level * qscale * quant_matrix[j]) >> 4;
544 level = (level * qscale * quant_matrix[j]) >> 4;
551 CLOSE_READER(re, &s->gb);
553 block[63] ^= mismatch & 1;
555 check_scantable_index(s, i);
557 s->block_last_index[n] = i;
562 * Note: this function can read out of range and crash for corrupt streams.
563 * Changing this would eat up any speed benefits it has.
564 * Do not use "fast" flag if you need the code to be robust.
566 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
567 int16_t *block, int n)
569 int level, dc, diff, i, j, run;
572 uint8_t *const scantable = s->intra_scantable.permutated;
573 const uint16_t *quant_matrix;
574 const int qscale = s->qscale;
578 quant_matrix = s->intra_matrix;
581 quant_matrix = s->chroma_intra_matrix;
582 component = (n & 1) + 1;
584 diff = decode_dc(&s->gb, component);
586 return AVERROR_INVALIDDATA;
587 dc = s->last_dc[component];
589 s->last_dc[component] = dc;
590 block[0] = dc * (1 << (3 - s->intra_dc_precision));
592 if (s->intra_vlc_format)
598 OPEN_READER(re, &s->gb);
599 /* now quantify & encode AC coefficients */
601 UPDATE_CACHE(re, &s->gb);
602 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
605 if (level >= 64 || i > 63) {
607 } else if (level != 0) {
610 level = (level * qscale * quant_matrix[j]) >> 4;
611 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
612 SHOW_SBITS(re, &s->gb, 1);
613 LAST_SKIP_BITS(re, &s->gb, 1);
616 run = SHOW_UBITS(re, &s->gb, 6) + 1;
617 LAST_SKIP_BITS(re, &s->gb, 6);
618 UPDATE_CACHE(re, &s->gb);
619 level = SHOW_SBITS(re, &s->gb, 12);
620 SKIP_BITS(re, &s->gb, 12);
624 level = (-level * qscale * quant_matrix[j]) >> 4;
627 level = (level * qscale * quant_matrix[j]) >> 4;
633 CLOSE_READER(re, &s->gb);
636 check_scantable_index(s, i);
638 s->block_last_index[n] = i;
642 /******************************************/
645 static inline int get_dmv(MpegEncContext *s)
647 if (get_bits1(&s->gb))
648 return 1 - (get_bits1(&s->gb) << 1);
653 /* motion type (for MPEG-2) */
659 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
661 int i, j, k, cbp, val, mb_type, motion_type;
662 const int mb_block_count = 4 + (1 << s->chroma_format);
665 ff_tlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
667 av_assert2(s->mb_skipped == 0);
669 if (s->mb_skip_run-- != 0) {
670 if (s->pict_type == AV_PICTURE_TYPE_P) {
672 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
673 MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
678 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
680 // FIXME not sure if this is allowed in MPEG at all
681 mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
682 if (IS_INTRA(mb_type)) {
683 av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
684 return AVERROR_INVALIDDATA;
686 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
687 mb_type | MB_TYPE_SKIP;
689 if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
696 switch (s->pict_type) {
698 case AV_PICTURE_TYPE_I:
699 if (get_bits1(&s->gb) == 0) {
700 if (get_bits1(&s->gb) == 0) {
701 av_log(s->avctx, AV_LOG_ERROR,
702 "Invalid mb type in I-frame at %d %d\n",
704 return AVERROR_INVALIDDATA;
706 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
708 mb_type = MB_TYPE_INTRA;
711 case AV_PICTURE_TYPE_P:
712 mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
714 av_log(s->avctx, AV_LOG_ERROR,
715 "Invalid mb type in P-frame at %d %d\n", s->mb_x, s->mb_y);
716 return AVERROR_INVALIDDATA;
718 mb_type = ptype2mb_type[mb_type];
720 case AV_PICTURE_TYPE_B:
721 mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
723 av_log(s->avctx, AV_LOG_ERROR,
724 "Invalid mb type in B-frame at %d %d\n", s->mb_x, s->mb_y);
725 return AVERROR_INVALIDDATA;
727 mb_type = btype2mb_type[mb_type];
730 ff_tlog(s->avctx, "mb_type=%x\n", mb_type);
731 // motion_type = 0; /* avoid warning */
732 if (IS_INTRA(mb_type)) {
733 s->bdsp.clear_blocks(s->block[0]);
735 if (!s->chroma_y_shift)
736 s->bdsp.clear_blocks(s->block[6]);
738 /* compute DCT type */
739 // FIXME: add an interlaced_dct coded var?
740 if (s->picture_structure == PICT_FRAME &&
741 !s->frame_pred_frame_dct)
742 s->interlaced_dct = get_bits1(&s->gb);
744 if (IS_QUANT(mb_type))
745 s->qscale = mpeg_get_qscale(s);
747 if (s->concealment_motion_vectors) {
748 /* just parse them */
749 if (s->picture_structure != PICT_FRAME)
750 skip_bits1(&s->gb); /* field select */
753 s->last_mv[0][0][0] =
754 s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
755 s->last_mv[0][0][0]);
757 s->last_mv[0][0][1] =
758 s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
759 s->last_mv[0][0][1]);
761 check_marker(s->avctx, &s->gb, "after concealment_motion_vectors");
763 /* reset mv prediction */
764 memset(s->last_mv, 0, sizeof(s->last_mv));
767 // if 1, we memcpy blocks in xvmcvideo
768 if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
769 ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
771 if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
772 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
773 for (i = 0; i < 6; i++)
774 mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
776 for (i = 0; i < mb_block_count; i++)
777 if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
781 for (i = 0; i < 6; i++) {
782 ret = ff_mpeg1_decode_block_intra(&s->gb,
784 s->intra_scantable.permutated,
785 s->last_dc, *s->pblocks[i],
788 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
793 s->block_last_index[i] = ret;
797 if (mb_type & MB_TYPE_ZERO_MV) {
798 av_assert2(mb_type & MB_TYPE_CBP);
800 s->mv_dir = MV_DIR_FORWARD;
801 if (s->picture_structure == PICT_FRAME) {
802 if (s->picture_structure == PICT_FRAME
803 && !s->frame_pred_frame_dct)
804 s->interlaced_dct = get_bits1(&s->gb);
805 s->mv_type = MV_TYPE_16X16;
807 s->mv_type = MV_TYPE_FIELD;
808 mb_type |= MB_TYPE_INTERLACED;
809 s->field_select[0][0] = s->picture_structure - 1;
812 if (IS_QUANT(mb_type))
813 s->qscale = mpeg_get_qscale(s);
815 s->last_mv[0][0][0] = 0;
816 s->last_mv[0][0][1] = 0;
817 s->last_mv[0][1][0] = 0;
818 s->last_mv[0][1][1] = 0;
822 av_assert2(mb_type & MB_TYPE_L0L1);
823 // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
824 /* get additional motion vector type */
825 if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
826 motion_type = MT_FRAME;
828 motion_type = get_bits(&s->gb, 2);
829 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
830 s->interlaced_dct = get_bits1(&s->gb);
833 if (IS_QUANT(mb_type))
834 s->qscale = mpeg_get_qscale(s);
837 s->mv_dir = (mb_type >> 13) & 3;
838 ff_tlog(s->avctx, "motion_type=%d\n", motion_type);
839 switch (motion_type) {
840 case MT_FRAME: /* or MT_16X8 */
841 if (s->picture_structure == PICT_FRAME) {
842 mb_type |= MB_TYPE_16x16;
843 s->mv_type = MV_TYPE_16X16;
844 for (i = 0; i < 2; i++) {
845 if (USES_LIST(mb_type, i)) {
848 s->last_mv[i][0][0] =
849 s->last_mv[i][1][0] =
850 mpeg_decode_motion(s, s->mpeg_f_code[i][0],
851 s->last_mv[i][0][0]);
853 s->last_mv[i][0][1] =
854 s->last_mv[i][1][1] =
855 mpeg_decode_motion(s, s->mpeg_f_code[i][1],
856 s->last_mv[i][0][1]);
857 /* full_pel: only for MPEG-1 */
858 if (s->full_pel[i]) {
865 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
866 s->mv_type = MV_TYPE_16X8;
867 for (i = 0; i < 2; i++) {
868 if (USES_LIST(mb_type, i)) {
870 for (j = 0; j < 2; j++) {
871 s->field_select[i][j] = get_bits1(&s->gb);
872 for (k = 0; k < 2; k++) {
873 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
874 s->last_mv[i][j][k]);
875 s->last_mv[i][j][k] = val;
876 s->mv[i][j][k] = val;
884 s->mv_type = MV_TYPE_FIELD;
885 if (s->picture_structure == PICT_FRAME) {
886 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
887 for (i = 0; i < 2; i++) {
888 if (USES_LIST(mb_type, i)) {
889 for (j = 0; j < 2; j++) {
890 s->field_select[i][j] = get_bits1(&s->gb);
891 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
892 s->last_mv[i][j][0]);
893 s->last_mv[i][j][0] = val;
894 s->mv[i][j][0] = val;
895 ff_tlog(s->avctx, "fmx=%d\n", val);
896 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
897 s->last_mv[i][j][1] >> 1);
898 s->last_mv[i][j][1] = 2 * val;
899 s->mv[i][j][1] = val;
900 ff_tlog(s->avctx, "fmy=%d\n", val);
905 av_assert0(!s->progressive_sequence);
906 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
907 for (i = 0; i < 2; i++) {
908 if (USES_LIST(mb_type, i)) {
909 s->field_select[i][0] = get_bits1(&s->gb);
910 for (k = 0; k < 2; k++) {
911 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
912 s->last_mv[i][0][k]);
913 s->last_mv[i][0][k] = val;
914 s->last_mv[i][1][k] = val;
915 s->mv[i][0][k] = val;
922 if (s->progressive_sequence){
923 av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
924 return AVERROR_INVALIDDATA;
926 s->mv_type = MV_TYPE_DMV;
927 for (i = 0; i < 2; i++) {
928 if (USES_LIST(mb_type, i)) {
929 int dmx, dmy, mx, my, m;
930 const int my_shift = s->picture_structure == PICT_FRAME;
932 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
933 s->last_mv[i][0][0]);
934 s->last_mv[i][0][0] = mx;
935 s->last_mv[i][1][0] = mx;
937 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
938 s->last_mv[i][0][1] >> my_shift);
942 s->last_mv[i][0][1] = my * (1 << my_shift);
943 s->last_mv[i][1][1] = my * (1 << my_shift);
947 s->mv[i][1][0] = mx; // not used
948 s->mv[i][1][1] = my; // not used
950 if (s->picture_structure == PICT_FRAME) {
951 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
953 // m = 1 + 2 * s->top_field_first;
954 m = s->top_field_first ? 1 : 3;
956 /* top -> top pred */
957 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
958 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
960 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
961 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
963 mb_type |= MB_TYPE_16x16;
965 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
966 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
967 if (s->picture_structure == PICT_TOP_FIELD)
976 av_log(s->avctx, AV_LOG_ERROR,
977 "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
978 return AVERROR_INVALIDDATA;
983 if (HAS_CBP(mb_type)) {
984 s->bdsp.clear_blocks(s->block[0]);
986 cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
987 if (mb_block_count > 6) {
988 cbp *= 1 << mb_block_count - 6;
989 cbp |= get_bits(&s->gb, mb_block_count - 6);
990 s->bdsp.clear_blocks(s->block[6]);
993 av_log(s->avctx, AV_LOG_ERROR,
994 "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
995 return AVERROR_INVALIDDATA;
998 // if 1, we memcpy blocks in xvmcvideo
999 if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1000 ff_xvmc_pack_pblocks(s, cbp);
1002 if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1003 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1004 for (i = 0; i < 6; i++) {
1006 mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1008 s->block_last_index[i] = -1;
1012 cbp <<= 12 - mb_block_count;
1014 for (i = 0; i < mb_block_count; i++) {
1015 if (cbp & (1 << 11)) {
1016 if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1019 s->block_last_index[i] = -1;
1025 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1026 for (i = 0; i < 6; i++) {
1028 mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1030 s->block_last_index[i] = -1;
1034 for (i = 0; i < 6; i++) {
1036 if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1039 s->block_last_index[i] = -1;
1046 for (i = 0; i < 12; i++)
1047 s->block_last_index[i] = -1;
1051 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1056 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1058 Mpeg1Context *s = avctx->priv_data;
1059 MpegEncContext *s2 = &s->mpeg_enc_ctx;
1061 ff_mpv_decode_defaults(s2);
1063 if ( avctx->codec_tag != AV_RL32("VCR2")
1064 && avctx->codec_tag != AV_RL32("BW10"))
1065 avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1066 ff_mpv_decode_init(s2, avctx);
1068 s->mpeg_enc_ctx.avctx = avctx;
1070 /* we need some permutation to store matrices,
1071 * until the decoder sets the real permutation. */
1072 ff_mpv_idct_init(s2);
1073 ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1074 ff_mpeg12_init_vlcs();
1076 s2->chroma_format = 1;
1077 s->mpeg_enc_ctx_allocated = 0;
1078 s->mpeg_enc_ctx.picture_number = 0;
1079 s->repeat_field = 0;
1080 s->mpeg_enc_ctx.codec_id = avctx->codec->id;
1081 avctx->color_range = AVCOL_RANGE_MPEG;
1086 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1087 const AVCodecContext *avctx_from)
1089 Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1090 MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1093 if (avctx == avctx_from ||
1094 !ctx_from->mpeg_enc_ctx_allocated ||
1095 !s1->context_initialized)
1098 err = ff_mpeg_update_thread_context(avctx, avctx_from);
1102 if (!ctx->mpeg_enc_ctx_allocated)
1103 memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1105 if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1106 s->picture_number++;
1112 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1113 const uint8_t *new_perm)
1115 uint16_t temp_matrix[64];
1118 memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1120 for (i = 0; i < 64; i++)
1121 matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1124 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1125 #if CONFIG_MPEG1_NVDEC_HWACCEL
1128 #if CONFIG_MPEG1_XVMC_HWACCEL
1131 #if CONFIG_MPEG1_VDPAU_HWACCEL
1138 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1139 #if CONFIG_MPEG2_NVDEC_HWACCEL
1142 #if CONFIG_MPEG2_XVMC_HWACCEL
1145 #if CONFIG_MPEG2_VDPAU_HWACCEL
1148 #if CONFIG_MPEG2_DXVA2_HWACCEL
1149 AV_PIX_FMT_DXVA2_VLD,
1151 #if CONFIG_MPEG2_D3D11VA_HWACCEL
1152 AV_PIX_FMT_D3D11VA_VLD,
1155 #if CONFIG_MPEG2_VAAPI_HWACCEL
1158 #if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
1159 AV_PIX_FMT_VIDEOTOOLBOX,
1165 static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1170 static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1175 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1177 Mpeg1Context *s1 = avctx->priv_data;
1178 MpegEncContext *s = &s1->mpeg_enc_ctx;
1179 const enum AVPixelFormat *pix_fmts;
1181 if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY))
1182 return AV_PIX_FMT_GRAY8;
1184 if (s->chroma_format < 2)
1185 pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1186 mpeg1_hwaccel_pixfmt_list_420 :
1187 mpeg2_hwaccel_pixfmt_list_420;
1188 else if (s->chroma_format == 2)
1189 pix_fmts = mpeg12_pixfmt_list_422;
1191 pix_fmts = mpeg12_pixfmt_list_444;
1193 return ff_thread_get_format(avctx, pix_fmts);
1196 static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1198 // until then pix_fmt may be changed right after codec init
1200 if (avctx->idct_algo == FF_IDCT_AUTO)
1201 avctx->idct_algo = FF_IDCT_NONE;
1203 if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1204 Mpeg1Context *s1 = avctx->priv_data;
1205 MpegEncContext *s = &s1->mpeg_enc_ctx;
1207 s->pack_pblocks = 1;
1211 /* Call this function when we know all parameters.
1212 * It may be called in different places for MPEG-1 and MPEG-2. */
1213 static int mpeg_decode_postinit(AVCodecContext *avctx)
1215 Mpeg1Context *s1 = avctx->priv_data;
1216 MpegEncContext *s = &s1->mpeg_enc_ctx;
1217 uint8_t old_permutation[64];
1220 if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1222 AVRational aspect_inv = av_d2q(ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1223 avctx->sample_aspect_ratio = (AVRational) { aspect_inv.den, aspect_inv.num };
1226 if (s->aspect_ratio_info > 1) {
1228 av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1229 (AVRational) { s1->pan_scan.width,
1230 s1->pan_scan.height }),
1231 (AVRational) { s->width, s->height });
1233 /* We ignore the spec here and guess a bit as reality does not
1234 * match the spec, see for example res_change_ffmpeg_aspect.ts
1235 * and sequence-display-aspect.mpg.
1236 * issue1613, 621, 562 */
1237 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1238 (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1239 av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1240 s->avctx->sample_aspect_ratio =
1241 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1242 (AVRational) { s->width, s->height });
1244 s->avctx->sample_aspect_ratio =
1245 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1246 (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1247 // issue1613 4/3 16/9 -> 16/9
1248 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1249 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1250 // s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1251 ff_dlog(avctx, "aspect A %d/%d\n",
1252 ff_mpeg2_aspect[s->aspect_ratio_info].num,
1253 ff_mpeg2_aspect[s->aspect_ratio_info].den);
1254 ff_dlog(avctx, "aspect B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1255 s->avctx->sample_aspect_ratio.den);
1258 s->avctx->sample_aspect_ratio =
1259 ff_mpeg2_aspect[s->aspect_ratio_info];
1263 if (av_image_check_sar(s->width, s->height,
1264 avctx->sample_aspect_ratio) < 0) {
1265 av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
1266 avctx->sample_aspect_ratio.num,
1267 avctx->sample_aspect_ratio.den);
1268 avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
1271 if ((s1->mpeg_enc_ctx_allocated == 0) ||
1272 avctx->coded_width != s->width ||
1273 avctx->coded_height != s->height ||
1274 s1->save_width != s->width ||
1275 s1->save_height != s->height ||
1276 av_cmp_q(s1->save_aspect, s->avctx->sample_aspect_ratio) ||
1277 (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1279 if (s1->mpeg_enc_ctx_allocated) {
1280 ParseContext pc = s->parse_context;
1281 s->parse_context.buffer = 0;
1282 ff_mpv_common_end(s);
1283 s->parse_context = pc;
1284 s1->mpeg_enc_ctx_allocated = 0;
1287 ret = ff_set_dimensions(avctx, s->width, s->height);
1291 if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1292 avctx->rc_max_rate = s->bit_rate;
1293 } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1294 (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1295 avctx->bit_rate = s->bit_rate;
1297 s1->save_aspect = s->avctx->sample_aspect_ratio;
1298 s1->save_width = s->width;
1299 s1->save_height = s->height;
1300 s1->save_progressive_seq = s->progressive_sequence;
1302 /* low_delay may be forced, in this case we will have B-frames
1303 * that behave like P-frames. */
1304 avctx->has_b_frames = !s->low_delay;
1306 if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1308 avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1309 avctx->ticks_per_frame = 1;
1311 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1314 av_reduce(&s->avctx->framerate.num,
1315 &s->avctx->framerate.den,
1316 ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1317 ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1319 avctx->ticks_per_frame = 2;
1321 switch (s->chroma_format) {
1322 case 1: avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; break;
1324 case 3: avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT; break;
1325 default: av_assert0(0);
1329 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1330 setup_hwaccel_for_pixfmt(avctx);
1332 /* Quantization matrices may need reordering
1333 * if DCT permutation is changed. */
1334 memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1336 ff_mpv_idct_init(s);
1337 if ((ret = ff_mpv_common_init(s)) < 0)
1340 quant_matrix_rebuild(s->intra_matrix, old_permutation, s->idsp.idct_permutation);
1341 quant_matrix_rebuild(s->inter_matrix, old_permutation, s->idsp.idct_permutation);
1342 quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1343 quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1345 s1->mpeg_enc_ctx_allocated = 1;
1350 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1353 Mpeg1Context *s1 = avctx->priv_data;
1354 MpegEncContext *s = &s1->mpeg_enc_ctx;
1355 int ref, f_code, vbv_delay;
1357 init_get_bits(&s->gb, buf, buf_size * 8);
1359 ref = get_bits(&s->gb, 10); /* temporal ref */
1360 s->pict_type = get_bits(&s->gb, 3);
1361 if (s->pict_type == 0 || s->pict_type > 3)
1362 return AVERROR_INVALIDDATA;
1364 vbv_delay = get_bits(&s->gb, 16);
1365 s->vbv_delay = vbv_delay;
1366 if (s->pict_type == AV_PICTURE_TYPE_P ||
1367 s->pict_type == AV_PICTURE_TYPE_B) {
1368 s->full_pel[0] = get_bits1(&s->gb);
1369 f_code = get_bits(&s->gb, 3);
1370 if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1371 return AVERROR_INVALIDDATA;
1373 s->mpeg_f_code[0][0] = f_code;
1374 s->mpeg_f_code[0][1] = f_code;
1376 if (s->pict_type == AV_PICTURE_TYPE_B) {
1377 s->full_pel[1] = get_bits1(&s->gb);
1378 f_code = get_bits(&s->gb, 3);
1379 if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1380 return AVERROR_INVALIDDATA;
1382 s->mpeg_f_code[1][0] = f_code;
1383 s->mpeg_f_code[1][1] = f_code;
1385 s->current_picture.f->pict_type = s->pict_type;
1386 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1388 if (avctx->debug & FF_DEBUG_PICT_INFO)
1389 av_log(avctx, AV_LOG_DEBUG,
1390 "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1397 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1399 MpegEncContext *s = &s1->mpeg_enc_ctx;
1400 int horiz_size_ext, vert_size_ext;
1402 AVCPBProperties *cpb_props;
1404 skip_bits(&s->gb, 1); /* profile and level esc*/
1405 s->avctx->profile = get_bits(&s->gb, 3);
1406 s->avctx->level = get_bits(&s->gb, 4);
1407 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1408 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1410 if (!s->chroma_format) {
1411 s->chroma_format = 1;
1412 av_log(s->avctx, AV_LOG_WARNING, "Chroma format invalid\n");
1415 horiz_size_ext = get_bits(&s->gb, 2);
1416 vert_size_ext = get_bits(&s->gb, 2);
1417 s->width |= (horiz_size_ext << 12);
1418 s->height |= (vert_size_ext << 12);
1419 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1420 s->bit_rate += (bit_rate_ext << 18) * 400LL;
1421 check_marker(s->avctx, &s->gb, "after bit rate extension");
1422 s1->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1424 s->low_delay = get_bits1(&s->gb);
1425 if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
1428 s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1429 s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1431 ff_dlog(s->avctx, "sequence extension\n");
1432 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1434 if (cpb_props = ff_add_cpb_side_data(s->avctx)) {
1435 cpb_props->buffer_size = s1->rc_buffer_size;
1436 if (s->bit_rate != 0x3FFFF*400)
1437 cpb_props->max_bitrate = s->bit_rate;
1440 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1441 av_log(s->avctx, AV_LOG_DEBUG,
1442 "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%"PRId64"\n",
1443 s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1444 s1->rc_buffer_size, s->bit_rate);
1447 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1449 MpegEncContext *s = &s1->mpeg_enc_ctx;
1450 int color_description, w, h;
1452 skip_bits(&s->gb, 3); /* video format */
1453 color_description = get_bits1(&s->gb);
1454 if (color_description) {
1455 s->avctx->color_primaries = get_bits(&s->gb, 8);
1456 s->avctx->color_trc = get_bits(&s->gb, 8);
1457 s->avctx->colorspace = get_bits(&s->gb, 8);
1459 w = get_bits(&s->gb, 14);
1460 skip_bits(&s->gb, 1); // marker
1461 h = get_bits(&s->gb, 14);
1462 // remaining 3 bits are zero padding
1464 s1->pan_scan.width = 16 * w;
1465 s1->pan_scan.height = 16 * h;
1467 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1468 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1471 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1473 MpegEncContext *s = &s1->mpeg_enc_ctx;
1477 if (s->progressive_sequence) {
1478 if (s->repeat_first_field) {
1480 if (s->top_field_first)
1484 if (s->picture_structure == PICT_FRAME) {
1486 if (s->repeat_first_field)
1490 for (i = 0; i < nofco; i++) {
1491 s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1492 skip_bits(&s->gb, 1); // marker
1493 s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1494 skip_bits(&s->gb, 1); // marker
1497 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1498 av_log(s->avctx, AV_LOG_DEBUG,
1499 "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1500 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1501 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1502 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1505 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1506 uint16_t matrix1[64], int intra)
1510 for (i = 0; i < 64; i++) {
1511 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1512 int v = get_bits(&s->gb, 8);
1514 av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1515 return AVERROR_INVALIDDATA;
1517 if (intra && i == 0 && v != 8) {
1518 av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1519 v = 8; // needed by pink.mpg / issue1046
1528 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1530 ff_dlog(s->avctx, "matrix extension\n");
1532 if (get_bits1(&s->gb))
1533 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1534 if (get_bits1(&s->gb))
1535 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1536 if (get_bits1(&s->gb))
1537 load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1538 if (get_bits1(&s->gb))
1539 load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1542 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1544 MpegEncContext *s = &s1->mpeg_enc_ctx;
1546 s->full_pel[0] = s->full_pel[1] = 0;
1547 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1548 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1549 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1550 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1551 if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1552 av_log(s->avctx, AV_LOG_ERROR,
1553 "Missing picture start code, guessing missing values\n");
1554 if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1555 if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1556 s->pict_type = AV_PICTURE_TYPE_I;
1558 s->pict_type = AV_PICTURE_TYPE_P;
1560 s->pict_type = AV_PICTURE_TYPE_B;
1561 s->current_picture.f->pict_type = s->pict_type;
1562 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1564 s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1565 s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1566 s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1567 s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1569 s->intra_dc_precision = get_bits(&s->gb, 2);
1570 s->picture_structure = get_bits(&s->gb, 2);
1571 s->top_field_first = get_bits1(&s->gb);
1572 s->frame_pred_frame_dct = get_bits1(&s->gb);
1573 s->concealment_motion_vectors = get_bits1(&s->gb);
1574 s->q_scale_type = get_bits1(&s->gb);
1575 s->intra_vlc_format = get_bits1(&s->gb);
1576 s->alternate_scan = get_bits1(&s->gb);
1577 s->repeat_first_field = get_bits1(&s->gb);
1578 s->chroma_420_type = get_bits1(&s->gb);
1579 s->progressive_frame = get_bits1(&s->gb);
1581 if (s->alternate_scan) {
1582 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1583 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1585 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1586 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1589 /* composite display not parsed */
1590 ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1591 ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1592 ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1593 ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1594 ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1595 ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1596 ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1597 ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1598 ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1601 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1603 AVCodecContext *avctx = s->avctx;
1604 Mpeg1Context *s1 = (Mpeg1Context *) s;
1607 if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) {
1608 if (s->mb_width * s->mb_height * 11LL / (33 * 2 * 8) > buf_size)
1609 return AVERROR_INVALIDDATA;
1612 /* start frame decoding */
1613 if (s->first_field || s->picture_structure == PICT_FRAME) {
1614 AVFrameSideData *pan_scan;
1616 if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1619 ff_mpeg_er_frame_start(s);
1621 /* first check if we must repeat the frame */
1622 s->current_picture_ptr->f->repeat_pict = 0;
1623 if (s->repeat_first_field) {
1624 if (s->progressive_sequence) {
1625 if (s->top_field_first)
1626 s->current_picture_ptr->f->repeat_pict = 4;
1628 s->current_picture_ptr->f->repeat_pict = 2;
1629 } else if (s->progressive_frame) {
1630 s->current_picture_ptr->f->repeat_pict = 1;
1634 pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1635 AV_FRAME_DATA_PANSCAN,
1636 sizeof(s1->pan_scan));
1638 return AVERROR(ENOMEM);
1639 memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1641 if (s1->a53_caption) {
1642 AVFrameSideData *sd = av_frame_new_side_data(
1643 s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1644 s1->a53_caption_size);
1646 memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1647 av_freep(&s1->a53_caption);
1650 if (s1->has_stereo3d) {
1651 AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1653 return AVERROR(ENOMEM);
1655 *stereo = s1->stereo3d;
1656 s1->has_stereo3d = 0;
1660 AVFrameSideData *sd =
1661 av_frame_new_side_data(s->current_picture_ptr->f,
1662 AV_FRAME_DATA_AFD, 1);
1664 return AVERROR(ENOMEM);
1666 *sd->data = s1->afd;
1670 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1671 ff_thread_finish_setup(avctx);
1672 } else { // second field
1675 if (!s->current_picture_ptr) {
1676 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1677 return AVERROR_INVALIDDATA;
1680 if (s->avctx->hwaccel) {
1681 if ((ret = s->avctx->hwaccel->end_frame(s->avctx)) < 0) {
1682 av_log(avctx, AV_LOG_ERROR,
1683 "hardware accelerator failed to decode first field\n");
1688 for (i = 0; i < 4; i++) {
1689 s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1690 if (s->picture_structure == PICT_BOTTOM_FIELD)
1691 s->current_picture.f->data[i] +=
1692 s->current_picture_ptr->f->linesize[i];
1696 if (avctx->hwaccel) {
1697 if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1704 #define DECODE_SLICE_ERROR -1
1705 #define DECODE_SLICE_OK 0
1709 * MpegEncContext.mb_y must be set to the MB row from the startcode.
1710 * @return DECODE_SLICE_ERROR if the slice is damaged,
1711 * DECODE_SLICE_OK if this slice is OK
1713 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1714 const uint8_t **buf, int buf_size)
1716 AVCodecContext *avctx = s->avctx;
1717 const int lowres = s->avctx->lowres;
1718 const int field_pic = s->picture_structure != PICT_FRAME;
1722 s->resync_mb_y = -1;
1724 av_assert0(mb_y < s->mb_height);
1726 init_get_bits(&s->gb, *buf, buf_size * 8);
1727 if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1728 skip_bits(&s->gb, 3);
1730 ff_mpeg1_clean_buffers(s);
1731 s->interlaced_dct = 0;
1733 s->qscale = mpeg_get_qscale(s);
1735 if (s->qscale == 0) {
1736 av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1737 return AVERROR_INVALIDDATA;
1740 /* extra slice info */
1741 if (skip_1stop_8data_bits(&s->gb) < 0)
1742 return AVERROR_INVALIDDATA;
1746 if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1749 while (get_bits_left(&s->gb) > 0) {
1750 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1751 MBINCR_VLC_BITS, 2);
1753 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1754 return AVERROR_INVALIDDATA;
1759 /* otherwise, stuffing, nothing to do */
1767 if (s->mb_x >= (unsigned) s->mb_width) {
1768 av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1769 return AVERROR_INVALIDDATA;
1772 if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1773 const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1774 int start_code = -1;
1775 buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1776 if (buf_end < *buf + buf_size)
1779 if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1780 return DECODE_SLICE_ERROR;
1782 return DECODE_SLICE_OK;
1785 s->resync_mb_x = s->mb_x;
1786 s->resync_mb_y = s->mb_y = mb_y;
1788 ff_init_block_index(s);
1790 if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1791 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1792 av_log(s->avctx, AV_LOG_DEBUG,
1793 "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",
1795 s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1796 s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1797 s->pict_type == AV_PICTURE_TYPE_I ? "I" :
1798 (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1799 (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1800 s->progressive_sequence ? "ps" : "",
1801 s->progressive_frame ? "pf" : "",
1802 s->alternate_scan ? "alt" : "",
1803 s->top_field_first ? "top" : "",
1804 s->intra_dc_precision, s->picture_structure,
1805 s->frame_pred_frame_dct, s->concealment_motion_vectors,
1806 s->q_scale_type, s->intra_vlc_format,
1807 s->repeat_first_field, s->chroma_420_type ? "420" : "");
1812 // If 1, we memcpy blocks in xvmcvideo.
1813 if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1814 ff_xvmc_init_block(s); // set s->block
1816 if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1819 // Note motion_val is normally NULL unless we want to extract the MVs.
1820 if (s->current_picture.motion_val[0] && !s->encoding) {
1821 const int wrap = s->b8_stride;
1822 int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1823 int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1824 int motion_x, motion_y, dir, i;
1826 for (i = 0; i < 2; i++) {
1827 for (dir = 0; dir < 2; dir++) {
1829 (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1830 motion_x = motion_y = 0;
1831 } else if (s->mv_type == MV_TYPE_16X16 ||
1832 (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1833 motion_x = s->mv[dir][0][0];
1834 motion_y = s->mv[dir][0][1];
1835 } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1836 motion_x = s->mv[dir][i][0];
1837 motion_y = s->mv[dir][i][1];
1840 s->current_picture.motion_val[dir][xy][0] = motion_x;
1841 s->current_picture.motion_val[dir][xy][1] = motion_y;
1842 s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1843 s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1844 s->current_picture.ref_index [dir][b8_xy] =
1845 s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1846 av_assert2(s->field_select[dir][i] == 0 ||
1847 s->field_select[dir][i] == 1);
1854 s->dest[0] += 16 >> lowres;
1855 s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1856 s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1858 ff_mpv_reconstruct_mb(s, s->block);
1860 if (++s->mb_x >= s->mb_width) {
1861 const int mb_size = 16 >> s->avctx->lowres;
1864 ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1865 ff_mpv_report_decode_progress(s);
1868 s->mb_y += 1 << field_pic;
1870 if (s->mb_y >= s->mb_height) {
1871 int left = get_bits_left(&s->gb);
1872 int is_d10 = s->chroma_format == 2 &&
1873 s->pict_type == AV_PICTURE_TYPE_I &&
1874 avctx->profile == 0 && avctx->level == 5 &&
1875 s->intra_dc_precision == 2 &&
1876 s->q_scale_type == 1 && s->alternate_scan == 0 &&
1877 s->progressive_frame == 0
1878 /* vbv_delay == 0xBBB || 0xE10 */;
1880 if (left >= 32 && !is_d10) {
1881 GetBitContext gb = s->gb;
1882 align_get_bits(&gb);
1883 if (show_bits(&gb, 24) == 0x060E2B) {
1884 av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1887 if (left > 32 && show_bits_long(&gb, 32) == 0x201) {
1888 av_log(avctx, AV_LOG_DEBUG, "skipping m704 alpha (unsupported)\n");
1894 (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1895 ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1896 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X at %d %d\n",
1897 left, left>0 ? show_bits(&s->gb, FFMIN(left, 23)) : 0, s->mb_x, s->mb_y);
1898 return AVERROR_INVALIDDATA;
1902 // There are some files out there which are missing the last slice
1903 // in cases where the slice is completely outside the visible
1904 // area, we detect this here instead of running into the end expecting
1906 left = get_bits_left(&s->gb);
1907 if (s->mb_y >= ((s->height + 15) >> 4) &&
1908 !s->progressive_sequence &&
1911 s->mb_skip_run == -1 &&
1912 (!left || show_bits(&s->gb, left) == 0))
1915 ff_init_block_index(s);
1918 /* skip mb handling */
1919 if (s->mb_skip_run == -1) {
1920 /* read increment again */
1923 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1924 MBINCR_VLC_BITS, 2);
1926 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1927 return AVERROR_INVALIDDATA;
1931 s->mb_skip_run += 33;
1932 } else if (code == 35) {
1933 if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1934 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1935 return AVERROR_INVALIDDATA;
1937 goto eos; /* end of slice */
1939 /* otherwise, stuffing, nothing to do */
1941 s->mb_skip_run += code;
1945 if (s->mb_skip_run) {
1947 if (s->pict_type == AV_PICTURE_TYPE_I) {
1948 av_log(s->avctx, AV_LOG_ERROR,
1949 "skipped MB in I-frame at %d %d\n", s->mb_x, s->mb_y);
1950 return AVERROR_INVALIDDATA;
1955 for (i = 0; i < 12; i++)
1956 s->block_last_index[i] = -1;
1957 if (s->picture_structure == PICT_FRAME)
1958 s->mv_type = MV_TYPE_16X16;
1960 s->mv_type = MV_TYPE_FIELD;
1961 if (s->pict_type == AV_PICTURE_TYPE_P) {
1962 /* if P type, zero motion vector is implied */
1963 s->mv_dir = MV_DIR_FORWARD;
1964 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1965 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1966 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1967 s->field_select[0][0] = (s->picture_structure - 1) & 1;
1969 /* if B type, reuse previous vectors and directions */
1970 s->mv[0][0][0] = s->last_mv[0][0][0];
1971 s->mv[0][0][1] = s->last_mv[0][0][1];
1972 s->mv[1][0][0] = s->last_mv[1][0][0];
1973 s->mv[1][0][1] = s->last_mv[1][0][1];
1974 s->field_select[0][0] = (s->picture_structure - 1) & 1;
1975 s->field_select[1][0] = (s->picture_structure - 1) & 1;
1980 eos: // end of slice
1981 if (get_bits_left(&s->gb) < 0) {
1982 av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1983 return AVERROR_INVALIDDATA;
1985 *buf += (get_bits_count(&s->gb) - 1) / 8;
1986 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);
1990 static int slice_decode_thread(AVCodecContext *c, void *arg)
1992 MpegEncContext *s = *(void **) arg;
1993 const uint8_t *buf = s->gb.buffer;
1994 int mb_y = s->start_mb_y;
1995 const int field_pic = s->picture_structure != PICT_FRAME;
1997 s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
2000 uint32_t start_code;
2003 ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
2005 ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2006 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
2007 s->start_mb_y, s->end_mb_y, s->er.error_count);
2009 if (c->err_recognition & AV_EF_EXPLODE)
2011 if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2012 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2014 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2016 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2017 s->mb_x - 1, s->mb_y,
2018 ER_AC_END | ER_DC_END | ER_MV_END);
2021 if (s->mb_y == s->end_mb_y)
2025 buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2026 if (start_code < SLICE_MIN_START_CODE || start_code > SLICE_MAX_START_CODE)
2027 return AVERROR_INVALIDDATA;
2028 mb_y = start_code - SLICE_MIN_START_CODE;
2029 if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2030 mb_y += (*buf&0xE0)<<2;
2032 if (s->picture_structure == PICT_BOTTOM_FIELD)
2034 if (mb_y >= s->end_mb_y)
2035 return AVERROR_INVALIDDATA;
2040 * Handle slice ends.
2041 * @return 1 if it seems to be the last slice
2043 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2045 Mpeg1Context *s1 = avctx->priv_data;
2046 MpegEncContext *s = &s1->mpeg_enc_ctx;
2048 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2051 if (s->avctx->hwaccel) {
2052 int ret = s->avctx->hwaccel->end_frame(s->avctx);
2054 av_log(avctx, AV_LOG_ERROR,
2055 "hardware accelerator failed to decode picture\n");
2060 /* end of slice reached */
2061 if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2064 ff_er_frame_end(&s->er);
2066 ff_mpv_frame_end(s);
2068 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2069 int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2072 ff_print_debug_info(s, s->current_picture_ptr, pict);
2073 ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2075 if (avctx->active_thread_type & FF_THREAD_FRAME)
2076 s->picture_number++;
2077 /* latency of 1 frame for I- and P-frames */
2078 /* XXX: use another variable than picture_number */
2079 if (s->last_picture_ptr) {
2080 int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2083 ff_print_debug_info(s, s->last_picture_ptr, pict);
2084 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2094 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2095 const uint8_t *buf, int buf_size)
2097 Mpeg1Context *s1 = avctx->priv_data;
2098 MpegEncContext *s = &s1->mpeg_enc_ctx;
2102 init_get_bits(&s->gb, buf, buf_size * 8);
2104 width = get_bits(&s->gb, 12);
2105 height = get_bits(&s->gb, 12);
2106 if (width == 0 || height == 0) {
2107 av_log(avctx, AV_LOG_WARNING,
2108 "Invalid horizontal or vertical size value.\n");
2109 if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2110 return AVERROR_INVALIDDATA;
2112 s->aspect_ratio_info = get_bits(&s->gb, 4);
2113 if (s->aspect_ratio_info == 0) {
2114 av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2115 if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2116 return AVERROR_INVALIDDATA;
2118 s->frame_rate_index = get_bits(&s->gb, 4);
2119 if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2120 av_log(avctx, AV_LOG_WARNING,
2121 "frame_rate_index %d is invalid\n", s->frame_rate_index);
2122 s->frame_rate_index = 1;
2124 s->bit_rate = get_bits(&s->gb, 18) * 400LL;
2125 if (check_marker(s->avctx, &s->gb, "in sequence header") == 0) {
2126 return AVERROR_INVALIDDATA;
2129 s1->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2130 skip_bits(&s->gb, 1);
2133 if (get_bits1(&s->gb)) {
2134 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2136 for (i = 0; i < 64; i++) {
2137 j = s->idsp.idct_permutation[i];
2138 v = ff_mpeg1_default_intra_matrix[i];
2139 s->intra_matrix[j] = v;
2140 s->chroma_intra_matrix[j] = v;
2143 if (get_bits1(&s->gb)) {
2144 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2146 for (i = 0; i < 64; i++) {
2147 int j = s->idsp.idct_permutation[i];
2148 v = ff_mpeg1_default_non_intra_matrix[i];
2149 s->inter_matrix[j] = v;
2150 s->chroma_inter_matrix[j] = v;
2154 if (show_bits(&s->gb, 23) != 0) {
2155 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2156 return AVERROR_INVALIDDATA;
2162 /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2163 s->progressive_sequence = 1;
2164 s->progressive_frame = 1;
2165 s->picture_structure = PICT_FRAME;
2167 s->frame_pred_frame_dct = 1;
2168 s->chroma_format = 1;
2170 s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2171 s->out_format = FMT_MPEG1;
2172 s->swap_uv = 0; // AFAIK VCR2 does not have SEQ_HEADER
2173 if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2176 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2177 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%"PRId64", aspect_ratio_info: %d \n",
2178 s1->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2183 static int vcr2_init_sequence(AVCodecContext *avctx)
2185 Mpeg1Context *s1 = avctx->priv_data;
2186 MpegEncContext *s = &s1->mpeg_enc_ctx;
2189 /* start new MPEG-1 context decoding */
2190 s->out_format = FMT_MPEG1;
2191 if (s1->mpeg_enc_ctx_allocated) {
2192 ff_mpv_common_end(s);
2193 s1->mpeg_enc_ctx_allocated = 0;
2195 s->width = avctx->coded_width;
2196 s->height = avctx->coded_height;
2197 avctx->has_b_frames = 0; // true?
2200 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2201 setup_hwaccel_for_pixfmt(avctx);
2203 ff_mpv_idct_init(s);
2204 if ((ret = ff_mpv_common_init(s)) < 0)
2206 s1->mpeg_enc_ctx_allocated = 1;
2208 for (i = 0; i < 64; i++) {
2209 int j = s->idsp.idct_permutation[i];
2210 v = ff_mpeg1_default_intra_matrix[i];
2211 s->intra_matrix[j] = v;
2212 s->chroma_intra_matrix[j] = v;
2214 v = ff_mpeg1_default_non_intra_matrix[i];
2215 s->inter_matrix[j] = v;
2216 s->chroma_inter_matrix[j] = v;
2219 s->progressive_sequence = 1;
2220 s->progressive_frame = 1;
2221 s->picture_structure = PICT_FRAME;
2223 s->frame_pred_frame_dct = 1;
2224 s->chroma_format = 1;
2225 if (s->codec_tag == AV_RL32("BW10")) {
2226 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2228 s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2229 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2231 s1->save_width = s->width;
2232 s1->save_height = s->height;
2233 s1->save_progressive_seq = s->progressive_sequence;
2237 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2238 const uint8_t *p, int buf_size)
2240 Mpeg1Context *s1 = avctx->priv_data;
2242 if (buf_size >= 6 &&
2243 p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2244 p[4] == 3 && (p[5] & 0x40)) {
2245 /* extract A53 Part 4 CC data */
2246 int cc_count = p[5] & 0x1f;
2247 if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2248 av_freep(&s1->a53_caption);
2249 s1->a53_caption_size = cc_count * 3;
2250 s1->a53_caption = av_malloc(s1->a53_caption_size);
2251 if (!s1->a53_caption) {
2252 s1->a53_caption_size = 0;
2254 memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2256 avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2259 } else if (buf_size >= 2 &&
2260 p[0] == 0x03 && (p[1]&0x7f) == 0x01) {
2261 /* extract SCTE-20 CC data */
2266 init_get_bits(&gb, p + 2, buf_size - 2);
2267 cc_count = get_bits(&gb, 5);
2269 av_freep(&s1->a53_caption);
2270 s1->a53_caption_size = cc_count * 3;
2271 s1->a53_caption = av_mallocz(s1->a53_caption_size);
2272 if (!s1->a53_caption) {
2273 s1->a53_caption_size = 0;
2275 uint8_t field, cc1, cc2;
2276 uint8_t *cap = s1->a53_caption;
2277 for (i = 0; i < cc_count && get_bits_left(&gb) >= 26; i++) {
2278 skip_bits(&gb, 2); // priority
2279 field = get_bits(&gb, 2);
2280 skip_bits(&gb, 5); // line_offset
2281 cc1 = get_bits(&gb, 8);
2282 cc2 = get_bits(&gb, 8);
2283 skip_bits(&gb, 1); // marker
2285 if (!field) { // forbidden
2286 cap[0] = cap[1] = cap[2] = 0x00;
2288 field = (field == 2 ? 1 : 0);
2289 if (!s1->mpeg_enc_ctx.top_field_first) field = !field;
2290 cap[0] = 0x04 | field;
2291 cap[1] = ff_reverse[cc1];
2292 cap[2] = ff_reverse[cc2];
2297 avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2300 } else if (buf_size >= 11 &&
2301 p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2302 /* extract DVD CC data
2304 * uint32_t user_data_start_code 0x000001B2 (big endian)
2305 * uint16_t user_identifier 0x4343 "CC"
2306 * uint8_t user_data_type_code 0x01
2307 * uint8_t caption_block_size 0xF8
2309 * bit 7 caption_odd_field_first 1=odd field (CC1/CC2) first 0=even field (CC3/CC4) first
2310 * bit 6 caption_filler 0
2311 * bit 5:1 caption_block_count number of caption blocks (pairs of caption words = frames). Most DVDs use 15 per start of GOP.
2312 * bit 0 caption_extra_field_added 1=one additional caption word
2314 * struct caption_field_block {
2316 * bit 7:1 caption_filler 0x7F (all 1s)
2317 * bit 0 caption_field_odd 1=odd field (this is CC1/CC2) 0=even field (this is CC3/CC4)
2318 * uint8_t caption_first_byte
2319 * uint8_t caption_second_byte
2320 * } caption_block[(caption_block_count * 2) + caption_extra_field_added];
2322 * Some DVDs encode caption data for both fields with caption_field_odd=1. The only way to decode the fields
2323 * correctly is to start on the field indicated by caption_odd_field_first and count between odd/even fields.
2324 * Don't assume that the first caption word is the odd field. There do exist MPEG files in the wild that start
2325 * on the even field. There also exist DVDs in the wild that encode an odd field count and the
2326 * caption_extra_field_added/caption_odd_field_first bits change per packet to allow that. */
2329 // There is a caption count field in the data, but it is often
2330 // incorrect. So count the number of captions present.
2331 for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2333 // Transform the DVD format into A53 Part 4 format
2335 av_freep(&s1->a53_caption);
2336 s1->a53_caption_size = cc_count * 6;
2337 s1->a53_caption = av_malloc(s1->a53_caption_size);
2338 if (!s1->a53_caption) {
2339 s1->a53_caption_size = 0;
2341 uint8_t field1 = !!(p[4] & 0x80);
2342 uint8_t *cap = s1->a53_caption;
2344 for (i = 0; i < cc_count; i++) {
2345 cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2348 cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2355 avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2362 static void mpeg_decode_user_data(AVCodecContext *avctx,
2363 const uint8_t *p, int buf_size)
2365 Mpeg1Context *s = avctx->priv_data;
2366 const uint8_t *buf_end = p + buf_size;
2367 Mpeg1Context *s1 = avctx->priv_data;
2371 for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2372 av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2374 av_log(avctx, AV_LOG_ERROR, "\n");
2380 if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2384 /* we parse the DTG active format information */
2385 if (buf_end - p >= 5 &&
2386 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2394 if (buf_end - p < 1)
2397 s1->afd = p[0] & 0x0f;
2399 } else if (buf_end - p >= 6 &&
2400 p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2401 p[4] == 0x03) { // S3D_video_format_length
2402 // the 0x7F mask ignores the reserved_bit value
2403 const uint8_t S3D_video_format_type = p[5] & 0x7F;
2405 if (S3D_video_format_type == 0x03 ||
2406 S3D_video_format_type == 0x04 ||
2407 S3D_video_format_type == 0x08 ||
2408 S3D_video_format_type == 0x23) {
2410 s1->has_stereo3d = 1;
2412 switch (S3D_video_format_type) {
2414 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2417 s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2420 s1->stereo3d.type = AV_STEREO3D_2D;
2423 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2427 } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2432 static void mpeg_decode_gop(AVCodecContext *avctx,
2433 const uint8_t *buf, int buf_size)
2435 Mpeg1Context *s1 = avctx->priv_data;
2436 MpegEncContext *s = &s1->mpeg_enc_ctx;
2440 init_get_bits(&s->gb, buf, buf_size * 8);
2442 tc = s-> timecode_frame_start = get_bits(&s->gb, 25);
2444 #if FF_API_PRIVATE_OPT
2445 FF_DISABLE_DEPRECATION_WARNINGS
2446 avctx->timecode_frame_start = tc;
2447 FF_ENABLE_DEPRECATION_WARNINGS
2450 s->closed_gop = get_bits1(&s->gb);
2451 /* broken_link indicates that after editing the
2452 * reference frames of the first B-Frames after GOP I-Frame
2453 * are missing (open gop) */
2454 broken_link = get_bits1(&s->gb);
2456 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2457 char tcbuf[AV_TIMECODE_STR_SIZE];
2458 av_timecode_make_mpeg_tc_string(tcbuf, tc);
2459 av_log(s->avctx, AV_LOG_DEBUG,
2460 "GOP (%s) closed_gop=%d broken_link=%d\n",
2461 tcbuf, s->closed_gop, broken_link);
2465 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2466 int *got_output, const uint8_t *buf, int buf_size)
2468 Mpeg1Context *s = avctx->priv_data;
2469 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2470 const uint8_t *buf_ptr = buf;
2471 const uint8_t *buf_end = buf + buf_size;
2472 int ret, input_size;
2473 int last_code = 0, skip_frame = 0;
2474 int picture_start_code_seen = 0;
2477 /* find next start code */
2478 uint32_t start_code = -1;
2479 buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2480 if (start_code > 0x1ff) {
2483 (avctx->active_thread_type & FF_THREAD_SLICE) &&
2486 av_assert0(avctx->thread_count > 1);
2488 avctx->execute(avctx, slice_decode_thread,
2489 &s2->thread_context[0], NULL,
2490 s->slice_count, sizeof(void *));
2491 for (i = 0; i < s->slice_count; i++)
2492 s2->er.error_count += s2->thread_context[i]->er.error_count;
2495 ret = slice_end(avctx, picture);
2499 // FIXME: merge with the stuff in mpeg_decode_slice
2500 if (s2->last_picture_ptr || s2->low_delay)
2506 if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2507 return AVERROR_INVALIDDATA;
2509 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2512 input_size = buf_end - buf_ptr;
2514 if (avctx->debug & FF_DEBUG_STARTCODE)
2515 av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2516 start_code, buf_ptr - buf, input_size);
2518 /* prepare data for next start code */
2519 switch (start_code) {
2520 case SEQ_START_CODE:
2521 if (last_code == 0) {
2522 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2523 if (buf != avctx->extradata)
2526 av_log(avctx, AV_LOG_ERROR,
2527 "ignoring SEQ_START_CODE after %X\n", last_code);
2528 if (avctx->err_recognition & AV_EF_EXPLODE)
2529 return AVERROR_INVALIDDATA;
2533 case PICTURE_START_CODE:
2534 if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2535 /* If it's a frame picture, there can't be more than one picture header.
2536 Yet, it does happen and we need to handle it. */
2537 av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2540 picture_start_code_seen = 1;
2542 if (s2->width <= 0 || s2->height <= 0) {
2543 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2544 s2->width, s2->height);
2545 return AVERROR_INVALIDDATA;
2549 s2->intra_dc_precision= 3;
2550 s2->intra_matrix[0]= 1;
2552 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2553 !avctx->hwaccel && s->slice_count) {
2556 avctx->execute(avctx, slice_decode_thread,
2557 s2->thread_context, NULL,
2558 s->slice_count, sizeof(void *));
2559 for (i = 0; i < s->slice_count; i++)
2560 s2->er.error_count += s2->thread_context[i]->er.error_count;
2563 if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2564 ret = mpeg_decode_postinit(avctx);
2566 av_log(avctx, AV_LOG_ERROR,
2567 "mpeg_decode_postinit() failure\n");
2571 /* We have a complete image: we try to decompress it. */
2572 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2575 last_code = PICTURE_START_CODE;
2577 av_log(avctx, AV_LOG_ERROR,
2578 "ignoring pic after %X\n", last_code);
2579 if (avctx->err_recognition & AV_EF_EXPLODE)
2580 return AVERROR_INVALIDDATA;
2583 case EXT_START_CODE:
2584 init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2586 switch (get_bits(&s2->gb, 4)) {
2588 if (last_code == 0) {
2589 mpeg_decode_sequence_extension(s);
2591 av_log(avctx, AV_LOG_ERROR,
2592 "ignoring seq ext after %X\n", last_code);
2593 if (avctx->err_recognition & AV_EF_EXPLODE)
2594 return AVERROR_INVALIDDATA;
2598 mpeg_decode_sequence_display_extension(s);
2601 mpeg_decode_quant_matrix_extension(s2);
2604 mpeg_decode_picture_display_extension(s);
2607 if (last_code == PICTURE_START_CODE) {
2608 mpeg_decode_picture_coding_extension(s);
2610 av_log(avctx, AV_LOG_ERROR,
2611 "ignoring pic cod ext after %X\n", last_code);
2612 if (avctx->err_recognition & AV_EF_EXPLODE)
2613 return AVERROR_INVALIDDATA;
2618 case USER_START_CODE:
2619 mpeg_decode_user_data(avctx, buf_ptr, input_size);
2621 case GOP_START_CODE:
2622 if (last_code == 0) {
2623 s2->first_field = 0;
2624 mpeg_decode_gop(avctx, buf_ptr, input_size);
2627 av_log(avctx, AV_LOG_ERROR,
2628 "ignoring GOP_START_CODE after %X\n", last_code);
2629 if (avctx->err_recognition & AV_EF_EXPLODE)
2630 return AVERROR_INVALIDDATA;
2634 if (start_code >= SLICE_MIN_START_CODE &&
2635 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2636 if (s2->progressive_sequence && !s2->progressive_frame) {
2637 s2->progressive_frame = 1;
2638 av_log(s2->avctx, AV_LOG_ERROR,
2639 "interlaced frame in progressive sequence, ignoring\n");
2642 if (s2->picture_structure == 0 ||
2643 (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2644 av_log(s2->avctx, AV_LOG_ERROR,
2645 "picture_structure %d invalid, ignoring\n",
2646 s2->picture_structure);
2647 s2->picture_structure = PICT_FRAME;
2650 if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2651 av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2653 if (s2->picture_structure == PICT_FRAME) {
2654 s2->first_field = 0;
2655 s2->v_edge_pos = 16 * s2->mb_height;
2657 s2->first_field ^= 1;
2658 s2->v_edge_pos = 8 * s2->mb_height;
2659 memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2662 if (start_code >= SLICE_MIN_START_CODE &&
2663 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2664 const int field_pic = s2->picture_structure != PICT_FRAME;
2665 int mb_y = start_code - SLICE_MIN_START_CODE;
2666 last_code = SLICE_MIN_START_CODE;
2667 if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2668 mb_y += (*buf_ptr&0xE0)<<2;
2671 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2674 if (buf_end - buf_ptr < 2) {
2675 av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2676 return AVERROR_INVALIDDATA;
2679 if (mb_y >= s2->mb_height) {
2680 av_log(s2->avctx, AV_LOG_ERROR,
2681 "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2682 return AVERROR_INVALIDDATA;
2685 if (!s2->last_picture_ptr) {
2686 /* Skip B-frames if we do not have reference frames and
2687 * GOP is not closed. */
2688 if (s2->pict_type == AV_PICTURE_TYPE_B) {
2689 if (!s2->closed_gop) {
2691 av_log(s2->avctx, AV_LOG_DEBUG,
2692 "Skipping B slice due to open GOP\n");
2697 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL))
2699 if (!s2->next_picture_ptr) {
2700 /* Skip P-frames if we do not have a reference frame or
2701 * we have an invalid header. */
2702 if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2704 av_log(s2->avctx, AV_LOG_DEBUG,
2705 "Skipping P slice due to !sync\n");
2709 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2710 s2->pict_type == AV_PICTURE_TYPE_B) ||
2711 (avctx->skip_frame >= AVDISCARD_NONKEY &&
2712 s2->pict_type != AV_PICTURE_TYPE_I) ||
2713 avctx->skip_frame >= AVDISCARD_ALL) {
2718 if (!s->mpeg_enc_ctx_allocated)
2721 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2722 if (mb_y < avctx->skip_top ||
2723 mb_y >= s2->mb_height - avctx->skip_bottom)
2727 if (!s2->pict_type) {
2728 av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2729 if (avctx->err_recognition & AV_EF_EXPLODE)
2730 return AVERROR_INVALIDDATA;
2734 if (s->first_slice) {
2737 if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2740 if (!s2->current_picture_ptr) {
2741 av_log(avctx, AV_LOG_ERROR,
2742 "current_picture not initialized\n");
2743 return AVERROR_INVALIDDATA;
2747 (avctx->active_thread_type & FF_THREAD_SLICE) &&
2749 int threshold = (s2->mb_height * s->slice_count +
2750 s2->slice_context_count / 2) /
2751 s2->slice_context_count;
2752 av_assert0(avctx->thread_count > 1);
2753 if (threshold <= mb_y) {
2754 MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2756 thread_context->start_mb_y = mb_y;
2757 thread_context->end_mb_y = s2->mb_height;
2758 if (s->slice_count) {
2759 s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2760 ret = ff_update_duplicate_context(thread_context, s2);
2764 init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2767 buf_ptr += 2; // FIXME add minimum number of bytes per slice
2769 ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2773 if (avctx->err_recognition & AV_EF_EXPLODE)
2775 if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2776 ff_er_add_slice(&s2->er, s2->resync_mb_x,
2777 s2->resync_mb_y, s2->mb_x, s2->mb_y,
2778 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2780 ff_er_add_slice(&s2->er, s2->resync_mb_x,
2781 s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2782 ER_AC_END | ER_DC_END | ER_MV_END);
2791 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2792 int *got_output, AVPacket *avpkt)
2794 const uint8_t *buf = avpkt->data;
2796 int buf_size = avpkt->size;
2797 Mpeg1Context *s = avctx->priv_data;
2798 AVFrame *picture = data;
2799 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2801 if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2802 /* special case for last picture */
2803 if (s2->low_delay == 0 && s2->next_picture_ptr) {
2804 int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2808 s2->next_picture_ptr = NULL;
2815 if (s2->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
2816 int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2819 if (ff_combine_frame(&s2->parse_context, next,
2820 (const uint8_t **) &buf, &buf_size) < 0)
2824 s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2825 if (s->mpeg_enc_ctx_allocated == 0 && ( s2->codec_tag == AV_RL32("VCR2")
2826 || s2->codec_tag == AV_RL32("BW10")
2828 vcr2_init_sequence(avctx);
2832 if (avctx->extradata && !s->extradata_decoded) {
2833 ret = decode_chunks(avctx, picture, got_output,
2834 avctx->extradata, avctx->extradata_size);
2836 av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2837 av_frame_unref(picture);
2840 s->extradata_decoded = 1;
2841 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2842 s2->current_picture_ptr = NULL;
2847 ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2848 if (ret<0 || *got_output) {
2849 s2->current_picture_ptr = NULL;
2851 if (s2->timecode_frame_start != -1 && *got_output) {
2852 AVFrameSideData *tcside = av_frame_new_side_data(picture,
2853 AV_FRAME_DATA_GOP_TIMECODE,
2856 return AVERROR(ENOMEM);
2857 memcpy(tcside->data, &s2->timecode_frame_start, sizeof(int64_t));
2859 s2->timecode_frame_start = -1;
2866 static void flush(AVCodecContext *avctx)
2868 Mpeg1Context *s = avctx->priv_data;
2872 ff_mpeg_flush(avctx);
2875 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2877 Mpeg1Context *s = avctx->priv_data;
2879 if (s->mpeg_enc_ctx_allocated)
2880 ff_mpv_common_end(&s->mpeg_enc_ctx);
2881 av_freep(&s->a53_caption);
2885 AVCodec ff_mpeg1video_decoder = {
2886 .name = "mpeg1video",
2887 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2888 .type = AVMEDIA_TYPE_VIDEO,
2889 .id = AV_CODEC_ID_MPEG1VIDEO,
2890 .priv_data_size = sizeof(Mpeg1Context),
2891 .init = mpeg_decode_init,
2892 .close = mpeg_decode_end,
2893 .decode = mpeg_decode_frame,
2894 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2895 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2896 AV_CODEC_CAP_SLICE_THREADS,
2897 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2900 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context),
2901 .hw_configs = (const AVCodecHWConfigInternal*[]) {
2902 #if CONFIG_MPEG1_NVDEC_HWACCEL
2903 HWACCEL_NVDEC(mpeg1),
2905 #if CONFIG_MPEG1_VDPAU_HWACCEL
2906 HWACCEL_VDPAU(mpeg1),
2908 #if CONFIG_MPEG1_VIDEOTOOLBOX_HWACCEL
2909 HWACCEL_VIDEOTOOLBOX(mpeg1),
2911 #if CONFIG_MPEG1_XVMC_HWACCEL
2912 HWACCEL_XVMC(mpeg1),
2918 AVCodec ff_mpeg2video_decoder = {
2919 .name = "mpeg2video",
2920 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2921 .type = AVMEDIA_TYPE_VIDEO,
2922 .id = AV_CODEC_ID_MPEG2VIDEO,
2923 .priv_data_size = sizeof(Mpeg1Context),
2924 .init = mpeg_decode_init,
2925 .close = mpeg_decode_end,
2926 .decode = mpeg_decode_frame,
2927 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2928 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2929 AV_CODEC_CAP_SLICE_THREADS,
2930 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2933 .profiles = NULL_IF_CONFIG_SMALL(ff_mpeg2_video_profiles),
2934 .hw_configs = (const AVCodecHWConfigInternal*[]) {
2935 #if CONFIG_MPEG2_DXVA2_HWACCEL
2936 HWACCEL_DXVA2(mpeg2),
2938 #if CONFIG_MPEG2_D3D11VA_HWACCEL
2939 HWACCEL_D3D11VA(mpeg2),
2941 #if CONFIG_MPEG2_D3D11VA2_HWACCEL
2942 HWACCEL_D3D11VA2(mpeg2),
2944 #if CONFIG_MPEG2_NVDEC_HWACCEL
2945 HWACCEL_NVDEC(mpeg2),
2947 #if CONFIG_MPEG2_VAAPI_HWACCEL
2948 HWACCEL_VAAPI(mpeg2),
2950 #if CONFIG_MPEG2_VDPAU_HWACCEL
2951 HWACCEL_VDPAU(mpeg2),
2953 #if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
2954 HWACCEL_VIDEOTOOLBOX(mpeg2),
2956 #if CONFIG_MPEG2_XVMC_HWACCEL
2957 HWACCEL_XVMC(mpeg2),
2964 AVCodec ff_mpegvideo_decoder = {
2965 .name = "mpegvideo",
2966 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2967 .type = AVMEDIA_TYPE_VIDEO,
2968 .id = AV_CODEC_ID_MPEG2VIDEO,
2969 .priv_data_size = sizeof(Mpeg1Context),
2970 .init = mpeg_decode_init,
2971 .close = mpeg_decode_end,
2972 .decode = mpeg_decode_frame,
2973 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
2974 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,