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"
48 #include "vdpau_internal.h"
49 #include "xvmc_internal.h"
51 typedef struct Mpeg1Context {
52 MpegEncContext mpeg_enc_ctx;
53 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
54 int repeat_field; /* true if we must repeat the field */
55 AVPanScan pan_scan; /* some temporary storage for the panscan */
63 AVRational save_aspect;
64 int save_width, save_height, save_progressive_seq;
65 AVRational frame_rate_ext; /* MPEG-2 specific framerate modificator */
66 int sync; /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
69 int extradata_decoded;
72 #define MB_TYPE_ZERO_MV 0x20000000
74 static const uint32_t ptype2mb_type[7] = {
76 MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
78 MB_TYPE_L0 | MB_TYPE_CBP,
79 MB_TYPE_QUANT | MB_TYPE_INTRA,
80 MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
81 MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
84 static const uint32_t btype2mb_type[11] = {
87 MB_TYPE_L1 | MB_TYPE_CBP,
89 MB_TYPE_L0 | MB_TYPE_CBP,
91 MB_TYPE_L0L1 | MB_TYPE_CBP,
92 MB_TYPE_QUANT | MB_TYPE_INTRA,
93 MB_TYPE_QUANT | MB_TYPE_L1 | MB_TYPE_CBP,
94 MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
95 MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
98 static const uint8_t non_linear_qscale[32] = {
99 0, 1, 2, 3, 4, 5, 6, 7,
100 8, 10, 12, 14, 16, 18, 20, 22,
101 24, 28, 32, 36, 40, 44, 48, 52,
102 56, 64, 72, 80, 88, 96, 104, 112,
105 /* as H.263, but only 17 codes */
106 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
108 int code, sign, val, shift;
110 code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
116 sign = get_bits1(&s->gb);
120 val = (val - 1) << shift;
121 val |= get_bits(&s->gb, shift);
128 /* modulo decoding */
129 return sign_extend(val, 5 + shift);
132 #define check_scantable_index(ctx, x) \
135 av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", \
136 ctx->mb_x, ctx->mb_y); \
137 return AVERROR_INVALIDDATA; \
141 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
142 int16_t *block, int n)
144 int level, dc, diff, i, j, run;
146 RLTable *rl = &ff_rl_mpeg1;
147 uint8_t *const scantable = s->intra_scantable.permutated;
148 const uint16_t *quant_matrix = s->intra_matrix;
149 const int qscale = s->qscale;
152 component = (n <= 3 ? 0 : n - 4 + 1);
153 diff = decode_dc(&s->gb, component);
155 return AVERROR_INVALIDDATA;
156 dc = s->last_dc[component];
158 s->last_dc[component] = dc;
159 block[0] = dc * quant_matrix[0];
160 ff_tlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
163 OPEN_READER(re, &s->gb);
164 UPDATE_CACHE(re, &s->gb);
165 if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
168 /* now quantify & encode AC coefficients */
170 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
175 check_scantable_index(s, i);
177 level = (level * qscale * quant_matrix[j]) >> 4;
178 level = (level - 1) | 1;
179 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
180 SHOW_SBITS(re, &s->gb, 1);
181 SKIP_BITS(re, &s->gb, 1);
184 run = SHOW_UBITS(re, &s->gb, 6) + 1;
185 LAST_SKIP_BITS(re, &s->gb, 6);
186 UPDATE_CACHE(re, &s->gb);
187 level = SHOW_SBITS(re, &s->gb, 8);
188 SKIP_BITS(re, &s->gb, 8);
190 level = SHOW_UBITS(re, &s->gb, 8) - 256;
191 SKIP_BITS(re, &s->gb, 8);
192 } else if (level == 0) {
193 level = SHOW_UBITS(re, &s->gb, 8);
194 SKIP_BITS(re, &s->gb, 8);
197 check_scantable_index(s, i);
201 level = (level * qscale * quant_matrix[j]) >> 4;
202 level = (level - 1) | 1;
205 level = (level * qscale * quant_matrix[j]) >> 4;
206 level = (level - 1) | 1;
211 if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
214 UPDATE_CACHE(re, &s->gb);
217 LAST_SKIP_BITS(re, &s->gb, 2);
218 CLOSE_READER(re, &s->gb);
220 s->block_last_index[n] = i;
224 int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
226 return mpeg1_decode_block_intra(s, block, n);
229 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
230 int16_t *block, int n)
232 int level, i, j, run;
233 RLTable *rl = &ff_rl_mpeg1;
234 uint8_t *const scantable = s->intra_scantable.permutated;
235 const uint16_t *quant_matrix = s->inter_matrix;
236 const int qscale = s->qscale;
239 OPEN_READER(re, &s->gb);
241 // special case for first coefficient, no need to add second VLC table
242 UPDATE_CACHE(re, &s->gb);
243 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
244 level = (3 * qscale * quant_matrix[0]) >> 5;
245 level = (level - 1) | 1;
246 if (GET_CACHE(re, &s->gb) & 0x40000000)
250 SKIP_BITS(re, &s->gb, 2);
251 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
254 /* now quantify & encode AC coefficients */
256 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
261 check_scantable_index(s, i);
263 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
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);
283 check_scantable_index(s, i);
287 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
288 level = (level - 1) | 1;
291 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
292 level = (level - 1) | 1;
297 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
299 UPDATE_CACHE(re, &s->gb);
302 LAST_SKIP_BITS(re, &s->gb, 2);
303 CLOSE_READER(re, &s->gb);
305 s->block_last_index[n] = i;
310 * Note: this function can read out of range and crash for corrupt streams.
311 * Changing this would eat up any speed benefits it has.
312 * Do not use "fast" flag if you need the code to be robust.
314 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
315 int16_t *block, int n)
317 int level, i, j, run;
318 RLTable *rl = &ff_rl_mpeg1;
319 uint8_t *const scantable = s->intra_scantable.permutated;
320 const int qscale = s->qscale;
323 OPEN_READER(re, &s->gb);
325 // Special case for first coefficient, no need to add second VLC table.
326 UPDATE_CACHE(re, &s->gb);
327 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
328 level = (3 * qscale) >> 1;
329 level = (level - 1) | 1;
330 if (GET_CACHE(re, &s->gb) & 0x40000000)
334 SKIP_BITS(re, &s->gb, 2);
335 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
339 /* now quantify & encode AC coefficients */
341 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
346 check_scantable_index(s, i);
348 level = ((level * 2 + 1) * qscale) >> 1;
349 level = (level - 1) | 1;
350 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
351 SHOW_SBITS(re, &s->gb, 1);
352 SKIP_BITS(re, &s->gb, 1);
355 run = SHOW_UBITS(re, &s->gb, 6) + 1;
356 LAST_SKIP_BITS(re, &s->gb, 6);
357 UPDATE_CACHE(re, &s->gb);
358 level = SHOW_SBITS(re, &s->gb, 8);
359 SKIP_BITS(re, &s->gb, 8);
361 level = SHOW_UBITS(re, &s->gb, 8) - 256;
362 SKIP_BITS(re, &s->gb, 8);
363 } else if (level == 0) {
364 level = SHOW_UBITS(re, &s->gb, 8);
365 SKIP_BITS(re, &s->gb, 8);
368 check_scantable_index(s, i);
372 level = ((level * 2 + 1) * qscale) >> 1;
373 level = (level - 1) | 1;
376 level = ((level * 2 + 1) * qscale) >> 1;
377 level = (level - 1) | 1;
382 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
384 UPDATE_CACHE(re, &s->gb);
387 LAST_SKIP_BITS(re, &s->gb, 2);
388 CLOSE_READER(re, &s->gb);
390 s->block_last_index[n] = i;
394 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
395 int16_t *block, int n)
397 int level, i, j, run;
398 RLTable *rl = &ff_rl_mpeg1;
399 uint8_t *const scantable = s->intra_scantable.permutated;
400 const uint16_t *quant_matrix;
401 const int qscale = s->qscale;
407 OPEN_READER(re, &s->gb);
410 quant_matrix = s->inter_matrix;
412 quant_matrix = s->chroma_inter_matrix;
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 * quant_matrix[0]) >> 5;
418 if (GET_CACHE(re, &s->gb) & 0x40000000)
423 SKIP_BITS(re, &s->gb, 2);
424 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
428 /* now quantify & encode AC coefficients */
430 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
435 check_scantable_index(s, i);
437 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
438 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
439 SHOW_SBITS(re, &s->gb, 1);
440 SKIP_BITS(re, &s->gb, 1);
443 run = SHOW_UBITS(re, &s->gb, 6) + 1;
444 LAST_SKIP_BITS(re, &s->gb, 6);
445 UPDATE_CACHE(re, &s->gb);
446 level = SHOW_SBITS(re, &s->gb, 12);
447 SKIP_BITS(re, &s->gb, 12);
450 check_scantable_index(s, i);
453 level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
456 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
462 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
464 UPDATE_CACHE(re, &s->gb);
467 LAST_SKIP_BITS(re, &s->gb, 2);
468 CLOSE_READER(re, &s->gb);
470 block[63] ^= (mismatch & 1);
472 s->block_last_index[n] = i;
477 * Note: this function can read out of range and crash for corrupt streams.
478 * Changing this would eat up any speed benefits it has.
479 * Do not use "fast" flag if you need the code to be robust.
481 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
482 int16_t *block, int n)
484 int level, i, j, run;
485 RLTable *rl = &ff_rl_mpeg1;
486 uint8_t *const scantable = s->intra_scantable.permutated;
487 const int qscale = s->qscale;
488 OPEN_READER(re, &s->gb);
491 // special case for first coefficient, no need to add second VLC table
492 UPDATE_CACHE(re, &s->gb);
493 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
494 level = (3 * qscale) >> 1;
495 if (GET_CACHE(re, &s->gb) & 0x40000000)
499 SKIP_BITS(re, &s->gb, 2);
500 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
504 /* now quantify & encode AC coefficients */
506 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
511 level = ((level * 2 + 1) * qscale) >> 1;
512 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
513 SHOW_SBITS(re, &s->gb, 1);
514 SKIP_BITS(re, &s->gb, 1);
517 run = SHOW_UBITS(re, &s->gb, 6) + 1;
518 LAST_SKIP_BITS(re, &s->gb, 6);
519 UPDATE_CACHE(re, &s->gb);
520 level = SHOW_SBITS(re, &s->gb, 12);
521 SKIP_BITS(re, &s->gb, 12);
526 level = ((-level * 2 + 1) * qscale) >> 1;
529 level = ((level * 2 + 1) * qscale) >> 1;
534 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
537 UPDATE_CACHE(re, &s->gb);
540 LAST_SKIP_BITS(re, &s->gb, 2);
541 CLOSE_READER(re, &s->gb);
542 s->block_last_index[n] = i;
546 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
547 int16_t *block, int n)
549 int level, dc, diff, i, j, run;
552 uint8_t *const scantable = s->intra_scantable.permutated;
553 const uint16_t *quant_matrix;
554 const int qscale = s->qscale;
559 quant_matrix = s->intra_matrix;
562 quant_matrix = s->chroma_intra_matrix;
563 component = (n & 1) + 1;
565 diff = decode_dc(&s->gb, component);
567 return AVERROR_INVALIDDATA;
568 dc = s->last_dc[component];
570 s->last_dc[component] = dc;
571 block[0] = dc << (3 - s->intra_dc_precision);
572 ff_tlog(s->avctx, "dc=%d\n", block[0]);
573 mismatch = block[0] ^ 1;
575 if (s->intra_vlc_format)
581 OPEN_READER(re, &s->gb);
582 /* now quantify & encode AC coefficients */
584 UPDATE_CACHE(re, &s->gb);
585 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
590 } else if (level != 0) {
592 check_scantable_index(s, i);
594 level = (level * qscale * quant_matrix[j]) >> 4;
595 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
596 SHOW_SBITS(re, &s->gb, 1);
597 LAST_SKIP_BITS(re, &s->gb, 1);
600 run = SHOW_UBITS(re, &s->gb, 6) + 1;
601 LAST_SKIP_BITS(re, &s->gb, 6);
602 UPDATE_CACHE(re, &s->gb);
603 level = SHOW_SBITS(re, &s->gb, 12);
604 SKIP_BITS(re, &s->gb, 12);
606 check_scantable_index(s, i);
609 level = (-level * qscale * quant_matrix[j]) >> 4;
612 level = (level * qscale * quant_matrix[j]) >> 4;
619 CLOSE_READER(re, &s->gb);
621 block[63] ^= mismatch & 1;
623 s->block_last_index[n] = i;
628 * Note: this function can read out of range and crash for corrupt streams.
629 * Changing this would eat up any speed benefits it has.
630 * Do not use "fast" flag if you need the code to be robust.
632 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
633 int16_t *block, int n)
635 int level, dc, diff, i, j, run;
638 uint8_t *const scantable = s->intra_scantable.permutated;
639 const uint16_t *quant_matrix;
640 const int qscale = s->qscale;
644 quant_matrix = s->intra_matrix;
647 quant_matrix = s->chroma_intra_matrix;
648 component = (n & 1) + 1;
650 diff = decode_dc(&s->gb, component);
652 return AVERROR_INVALIDDATA;
653 dc = s->last_dc[component];
655 s->last_dc[component] = dc;
656 block[0] = dc << (3 - s->intra_dc_precision);
658 if (s->intra_vlc_format)
664 OPEN_READER(re, &s->gb);
665 /* now quantify & encode AC coefficients */
667 UPDATE_CACHE(re, &s->gb);
668 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
671 if (level >= 64 || i > 63) {
673 } else if (level != 0) {
676 level = (level * qscale * quant_matrix[j]) >> 4;
677 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
678 SHOW_SBITS(re, &s->gb, 1);
679 LAST_SKIP_BITS(re, &s->gb, 1);
682 run = SHOW_UBITS(re, &s->gb, 6) + 1;
683 LAST_SKIP_BITS(re, &s->gb, 6);
684 UPDATE_CACHE(re, &s->gb);
685 level = SHOW_SBITS(re, &s->gb, 12);
686 SKIP_BITS(re, &s->gb, 12);
690 level = (-level * qscale * quant_matrix[j]) >> 4;
693 level = (level * qscale * quant_matrix[j]) >> 4;
699 CLOSE_READER(re, &s->gb);
702 s->block_last_index[n] = i;
706 /******************************************/
709 static inline int get_dmv(MpegEncContext *s)
711 if (get_bits1(&s->gb))
712 return 1 - (get_bits1(&s->gb) << 1);
717 static inline int get_qscale(MpegEncContext *s)
719 int qscale = get_bits(&s->gb, 5);
721 return non_linear_qscale[qscale];
727 /* motion type (for MPEG-2) */
733 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
735 int i, j, k, cbp, val, mb_type, motion_type;
736 const int mb_block_count = 4 + (1 << s->chroma_format);
739 ff_tlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
741 av_assert2(s->mb_skipped == 0);
743 if (s->mb_skip_run-- != 0) {
744 if (s->pict_type == AV_PICTURE_TYPE_P) {
746 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
747 MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
752 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
754 // FIXME not sure if this is allowed in MPEG at all
755 mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
756 if (IS_INTRA(mb_type)) {
757 av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
758 return AVERROR_INVALIDDATA;
760 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
761 mb_type | MB_TYPE_SKIP;
763 if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
770 switch (s->pict_type) {
772 case AV_PICTURE_TYPE_I:
773 if (get_bits1(&s->gb) == 0) {
774 if (get_bits1(&s->gb) == 0) {
775 av_log(s->avctx, AV_LOG_ERROR,
776 "invalid mb type in I Frame at %d %d\n",
778 return AVERROR_INVALIDDATA;
780 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
782 mb_type = MB_TYPE_INTRA;
785 case AV_PICTURE_TYPE_P:
786 mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
788 av_log(s->avctx, AV_LOG_ERROR,
789 "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
790 return AVERROR_INVALIDDATA;
792 mb_type = ptype2mb_type[mb_type];
794 case AV_PICTURE_TYPE_B:
795 mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
797 av_log(s->avctx, AV_LOG_ERROR,
798 "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
799 return AVERROR_INVALIDDATA;
801 mb_type = btype2mb_type[mb_type];
804 ff_tlog(s->avctx, "mb_type=%x\n", mb_type);
805 // motion_type = 0; /* avoid warning */
806 if (IS_INTRA(mb_type)) {
807 s->bdsp.clear_blocks(s->block[0]);
809 if (!s->chroma_y_shift)
810 s->bdsp.clear_blocks(s->block[6]);
812 /* compute DCT type */
813 // FIXME: add an interlaced_dct coded var?
814 if (s->picture_structure == PICT_FRAME &&
815 !s->frame_pred_frame_dct)
816 s->interlaced_dct = get_bits1(&s->gb);
818 if (IS_QUANT(mb_type))
819 s->qscale = get_qscale(s);
821 if (s->concealment_motion_vectors) {
822 /* just parse them */
823 if (s->picture_structure != PICT_FRAME)
824 skip_bits1(&s->gb); /* field select */
827 s->last_mv[0][0][0] =
828 s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
829 s->last_mv[0][0][0]);
831 s->last_mv[0][0][1] =
832 s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
833 s->last_mv[0][0][1]);
835 check_marker(&s->gb, "after concealment_motion_vectors");
837 /* reset mv prediction */
838 memset(s->last_mv, 0, sizeof(s->last_mv));
841 // if 1, we memcpy blocks in xvmcvideo
842 if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
843 ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
845 if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
846 if (s->flags2 & CODEC_FLAG2_FAST) {
847 for (i = 0; i < 6; i++)
848 mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
850 for (i = 0; i < mb_block_count; i++)
851 if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
855 for (i = 0; i < 6; i++)
856 if ((ret = mpeg1_decode_block_intra(s, *s->pblocks[i], i)) < 0)
860 if (mb_type & MB_TYPE_ZERO_MV) {
861 av_assert2(mb_type & MB_TYPE_CBP);
863 s->mv_dir = MV_DIR_FORWARD;
864 if (s->picture_structure == PICT_FRAME) {
865 if (s->picture_structure == PICT_FRAME
866 && !s->frame_pred_frame_dct)
867 s->interlaced_dct = get_bits1(&s->gb);
868 s->mv_type = MV_TYPE_16X16;
870 s->mv_type = MV_TYPE_FIELD;
871 mb_type |= MB_TYPE_INTERLACED;
872 s->field_select[0][0] = s->picture_structure - 1;
875 if (IS_QUANT(mb_type))
876 s->qscale = get_qscale(s);
878 s->last_mv[0][0][0] = 0;
879 s->last_mv[0][0][1] = 0;
880 s->last_mv[0][1][0] = 0;
881 s->last_mv[0][1][1] = 0;
885 av_assert2(mb_type & MB_TYPE_L0L1);
886 // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
887 /* get additional motion vector type */
888 if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
889 motion_type = MT_FRAME;
891 motion_type = get_bits(&s->gb, 2);
892 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
893 s->interlaced_dct = get_bits1(&s->gb);
896 if (IS_QUANT(mb_type))
897 s->qscale = get_qscale(s);
900 s->mv_dir = (mb_type >> 13) & 3;
901 ff_tlog(s->avctx, "motion_type=%d\n", motion_type);
902 switch (motion_type) {
903 case MT_FRAME: /* or MT_16X8 */
904 if (s->picture_structure == PICT_FRAME) {
905 mb_type |= MB_TYPE_16x16;
906 s->mv_type = MV_TYPE_16X16;
907 for (i = 0; i < 2; i++) {
908 if (USES_LIST(mb_type, i)) {
911 s->last_mv[i][0][0] =
912 s->last_mv[i][1][0] =
913 mpeg_decode_motion(s, s->mpeg_f_code[i][0],
914 s->last_mv[i][0][0]);
916 s->last_mv[i][0][1] =
917 s->last_mv[i][1][1] =
918 mpeg_decode_motion(s, s->mpeg_f_code[i][1],
919 s->last_mv[i][0][1]);
920 /* full_pel: only for MPEG-1 */
921 if (s->full_pel[i]) {
922 s->mv[i][0][0] <<= 1;
923 s->mv[i][0][1] <<= 1;
928 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
929 s->mv_type = MV_TYPE_16X8;
930 for (i = 0; i < 2; i++) {
931 if (USES_LIST(mb_type, i)) {
933 for (j = 0; j < 2; j++) {
934 s->field_select[i][j] = get_bits1(&s->gb);
935 for (k = 0; k < 2; k++) {
936 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
937 s->last_mv[i][j][k]);
938 s->last_mv[i][j][k] = val;
939 s->mv[i][j][k] = val;
947 s->mv_type = MV_TYPE_FIELD;
948 if (s->picture_structure == PICT_FRAME) {
949 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
950 for (i = 0; i < 2; i++) {
951 if (USES_LIST(mb_type, i)) {
952 for (j = 0; j < 2; j++) {
953 s->field_select[i][j] = get_bits1(&s->gb);
954 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
955 s->last_mv[i][j][0]);
956 s->last_mv[i][j][0] = val;
957 s->mv[i][j][0] = val;
958 ff_tlog(s->avctx, "fmx=%d\n", val);
959 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
960 s->last_mv[i][j][1] >> 1);
961 s->last_mv[i][j][1] = 2 * val;
962 s->mv[i][j][1] = val;
963 ff_tlog(s->avctx, "fmy=%d\n", val);
968 av_assert0(!s->progressive_sequence);
969 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
970 for (i = 0; i < 2; i++) {
971 if (USES_LIST(mb_type, i)) {
972 s->field_select[i][0] = get_bits1(&s->gb);
973 for (k = 0; k < 2; k++) {
974 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
975 s->last_mv[i][0][k]);
976 s->last_mv[i][0][k] = val;
977 s->last_mv[i][1][k] = val;
978 s->mv[i][0][k] = val;
985 if (s->progressive_sequence){
986 av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
987 return AVERROR_INVALIDDATA;
989 s->mv_type = MV_TYPE_DMV;
990 for (i = 0; i < 2; i++) {
991 if (USES_LIST(mb_type, i)) {
992 int dmx, dmy, mx, my, m;
993 const int my_shift = s->picture_structure == PICT_FRAME;
995 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
996 s->last_mv[i][0][0]);
997 s->last_mv[i][0][0] = mx;
998 s->last_mv[i][1][0] = mx;
1000 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1001 s->last_mv[i][0][1] >> my_shift);
1005 s->last_mv[i][0][1] = my << my_shift;
1006 s->last_mv[i][1][1] = my << my_shift;
1008 s->mv[i][0][0] = mx;
1009 s->mv[i][0][1] = my;
1010 s->mv[i][1][0] = mx; // not used
1011 s->mv[i][1][1] = my; // not used
1013 if (s->picture_structure == PICT_FRAME) {
1014 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1016 // m = 1 + 2 * s->top_field_first;
1017 m = s->top_field_first ? 1 : 3;
1019 /* top -> top pred */
1020 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1021 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1023 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1024 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1026 mb_type |= MB_TYPE_16x16;
1028 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1029 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1030 if (s->picture_structure == PICT_TOP_FIELD)
1039 av_log(s->avctx, AV_LOG_ERROR,
1040 "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1041 return AVERROR_INVALIDDATA;
1046 if (HAS_CBP(mb_type)) {
1047 s->bdsp.clear_blocks(s->block[0]);
1049 cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1050 if (mb_block_count > 6) {
1051 cbp <<= mb_block_count - 6;
1052 cbp |= get_bits(&s->gb, mb_block_count - 6);
1053 s->bdsp.clear_blocks(s->block[6]);
1056 av_log(s->avctx, AV_LOG_ERROR,
1057 "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
1058 return AVERROR_INVALIDDATA;
1061 // if 1, we memcpy blocks in xvmcvideo
1062 if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1063 ff_xvmc_pack_pblocks(s, cbp);
1065 if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1066 if (s->flags2 & CODEC_FLAG2_FAST) {
1067 for (i = 0; i < 6; i++) {
1069 mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1071 s->block_last_index[i] = -1;
1075 cbp <<= 12 - mb_block_count;
1077 for (i = 0; i < mb_block_count; i++) {
1078 if (cbp & (1 << 11)) {
1079 if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1082 s->block_last_index[i] = -1;
1088 if (s->flags2 & CODEC_FLAG2_FAST) {
1089 for (i = 0; i < 6; i++) {
1091 mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1093 s->block_last_index[i] = -1;
1097 for (i = 0; i < 6; i++) {
1099 if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1102 s->block_last_index[i] = -1;
1109 for (i = 0; i < 12; i++)
1110 s->block_last_index[i] = -1;
1114 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1119 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1121 Mpeg1Context *s = avctx->priv_data;
1122 MpegEncContext *s2 = &s->mpeg_enc_ctx;
1124 ff_mpv_decode_defaults(s2);
1126 if ( avctx->codec_tag != AV_RL32("VCR2")
1127 && avctx->codec_tag != AV_RL32("BW10"))
1128 avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1129 ff_mpv_decode_init(s2, avctx);
1131 s->mpeg_enc_ctx.avctx = avctx;
1133 /* we need some permutation to store matrices,
1134 * until the decoder sets the real permutation. */
1135 ff_mpv_idct_init(s2);
1136 ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1137 ff_mpeg12_init_vlcs();
1139 s->mpeg_enc_ctx_allocated = 0;
1140 s->mpeg_enc_ctx.picture_number = 0;
1141 s->repeat_field = 0;
1142 s->mpeg_enc_ctx.codec_id = avctx->codec->id;
1143 avctx->color_range = AVCOL_RANGE_MPEG;
1144 if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1145 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1147 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1151 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1152 const AVCodecContext *avctx_from)
1154 Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1155 MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1158 if (avctx == avctx_from ||
1159 !ctx_from->mpeg_enc_ctx_allocated ||
1160 !s1->context_initialized)
1163 err = ff_mpeg_update_thread_context(avctx, avctx_from);
1167 if (!ctx->mpeg_enc_ctx_allocated)
1168 memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1170 if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1171 s->picture_number++;
1176 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1177 const uint8_t *new_perm)
1179 uint16_t temp_matrix[64];
1182 memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1184 for (i = 0; i < 64; i++)
1185 matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1188 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1189 #if CONFIG_MPEG1_XVMC_HWACCEL
1192 #if CONFIG_MPEG1_VDPAU_HWACCEL
1193 AV_PIX_FMT_VDPAU_MPEG1,
1200 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1201 #if CONFIG_MPEG2_XVMC_HWACCEL
1204 #if CONFIG_MPEG2_VDPAU_HWACCEL
1205 AV_PIX_FMT_VDPAU_MPEG2,
1208 #if CONFIG_MPEG2_DXVA2_HWACCEL
1209 AV_PIX_FMT_DXVA2_VLD,
1211 #if CONFIG_MPEG2_VAAPI_HWACCEL
1212 AV_PIX_FMT_VAAPI_VLD,
1218 static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1223 static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1228 static inline int uses_vdpau(AVCodecContext *avctx) {
1229 return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1232 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1234 Mpeg1Context *s1 = avctx->priv_data;
1235 MpegEncContext *s = &s1->mpeg_enc_ctx;
1236 const enum AVPixelFormat *pix_fmts;
1238 if (CONFIG_GRAY && (avctx->flags & CODEC_FLAG_GRAY))
1239 return AV_PIX_FMT_GRAY8;
1241 if (s->chroma_format < 2)
1242 pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1243 mpeg1_hwaccel_pixfmt_list_420 :
1244 mpeg2_hwaccel_pixfmt_list_420;
1245 else if (s->chroma_format == 2)
1246 pix_fmts = mpeg12_pixfmt_list_422;
1248 pix_fmts = mpeg12_pixfmt_list_444;
1250 return ff_thread_get_format(avctx, pix_fmts);
1253 static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1255 // until then pix_fmt may be changed right after codec init
1256 if (avctx->hwaccel || uses_vdpau(avctx))
1257 if (avctx->idct_algo == FF_IDCT_AUTO)
1258 avctx->idct_algo = FF_IDCT_SIMPLE;
1260 if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1261 Mpeg1Context *s1 = avctx->priv_data;
1262 MpegEncContext *s = &s1->mpeg_enc_ctx;
1264 s->pack_pblocks = 1;
1266 avctx->xvmc_acceleration = 2;
1267 #endif /* FF_API_XVMC */
1271 /* Call this function when we know all parameters.
1272 * It may be called in different places for MPEG-1 and MPEG-2. */
1273 static int mpeg_decode_postinit(AVCodecContext *avctx)
1275 Mpeg1Context *s1 = avctx->priv_data;
1276 MpegEncContext *s = &s1->mpeg_enc_ctx;
1277 uint8_t old_permutation[64];
1280 if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1282 avctx->sample_aspect_ratio = av_d2q(1.0 / ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1285 if (s->aspect_ratio_info > 1) {
1287 av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1288 (AVRational) { s1->pan_scan.width,
1289 s1->pan_scan.height }),
1290 (AVRational) { s->width, s->height });
1292 /* We ignore the spec here and guess a bit as reality does not
1293 * match the spec, see for example res_change_ffmpeg_aspect.ts
1294 * and sequence-display-aspect.mpg.
1295 * issue1613, 621, 562 */
1296 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1297 (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1298 av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1299 s->avctx->sample_aspect_ratio =
1300 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1301 (AVRational) { s->width, s->height });
1303 s->avctx->sample_aspect_ratio =
1304 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1305 (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1306 // issue1613 4/3 16/9 -> 16/9
1307 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1308 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1309 // s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1310 ff_dlog(avctx, "aspect A %d/%d\n",
1311 ff_mpeg2_aspect[s->aspect_ratio_info].num,
1312 ff_mpeg2_aspect[s->aspect_ratio_info].den);
1313 ff_dlog(avctx, "aspect B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1314 s->avctx->sample_aspect_ratio.den);
1317 s->avctx->sample_aspect_ratio =
1318 ff_mpeg2_aspect[s->aspect_ratio_info];
1322 if (av_image_check_sar(s->width, s->height,
1323 avctx->sample_aspect_ratio) < 0) {
1324 av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
1325 avctx->sample_aspect_ratio.num,
1326 avctx->sample_aspect_ratio.den);
1327 avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
1330 if ((s1->mpeg_enc_ctx_allocated == 0) ||
1331 avctx->coded_width != s->width ||
1332 avctx->coded_height != s->height ||
1333 s1->save_width != s->width ||
1334 s1->save_height != s->height ||
1335 av_cmp_q(s1->save_aspect, s->avctx->sample_aspect_ratio) ||
1336 (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1338 if (s1->mpeg_enc_ctx_allocated) {
1339 ParseContext pc = s->parse_context;
1340 s->parse_context.buffer = 0;
1341 ff_mpv_common_end(s);
1342 s->parse_context = pc;
1343 s1->mpeg_enc_ctx_allocated = 0;
1346 ret = ff_set_dimensions(avctx, s->width, s->height);
1350 if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1351 avctx->rc_max_rate = s->bit_rate;
1352 } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1353 (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1354 avctx->bit_rate = s->bit_rate;
1356 s1->save_aspect = s->avctx->sample_aspect_ratio;
1357 s1->save_width = s->width;
1358 s1->save_height = s->height;
1359 s1->save_progressive_seq = s->progressive_sequence;
1361 /* low_delay may be forced, in this case we will have B-frames
1362 * that behave like P-frames. */
1363 avctx->has_b_frames = !s->low_delay;
1365 if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1367 avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1368 avctx->ticks_per_frame = 1;
1371 av_reduce(&s->avctx->framerate.num,
1372 &s->avctx->framerate.den,
1373 ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1374 ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1376 avctx->ticks_per_frame = 2;
1379 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1380 setup_hwaccel_for_pixfmt(avctx);
1382 /* Quantization matrices may need reordering
1383 * if DCT permutation is changed. */
1384 memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1386 ff_mpv_idct_init(s);
1387 if ((ret = ff_mpv_common_init(s)) < 0)
1390 quant_matrix_rebuild(s->intra_matrix, old_permutation, s->idsp.idct_permutation);
1391 quant_matrix_rebuild(s->inter_matrix, old_permutation, s->idsp.idct_permutation);
1392 quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1393 quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1395 s1->mpeg_enc_ctx_allocated = 1;
1400 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1403 Mpeg1Context *s1 = avctx->priv_data;
1404 MpegEncContext *s = &s1->mpeg_enc_ctx;
1405 int ref, f_code, vbv_delay;
1407 init_get_bits(&s->gb, buf, buf_size * 8);
1409 ref = get_bits(&s->gb, 10); /* temporal ref */
1410 s->pict_type = get_bits(&s->gb, 3);
1411 if (s->pict_type == 0 || s->pict_type > 3)
1412 return AVERROR_INVALIDDATA;
1414 vbv_delay = get_bits(&s->gb, 16);
1415 s->vbv_delay = vbv_delay;
1416 if (s->pict_type == AV_PICTURE_TYPE_P ||
1417 s->pict_type == AV_PICTURE_TYPE_B) {
1418 s->full_pel[0] = get_bits1(&s->gb);
1419 f_code = get_bits(&s->gb, 3);
1420 if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1421 return AVERROR_INVALIDDATA;
1423 s->mpeg_f_code[0][0] = f_code;
1424 s->mpeg_f_code[0][1] = f_code;
1426 if (s->pict_type == AV_PICTURE_TYPE_B) {
1427 s->full_pel[1] = get_bits1(&s->gb);
1428 f_code = get_bits(&s->gb, 3);
1429 if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1430 return AVERROR_INVALIDDATA;
1432 s->mpeg_f_code[1][0] = f_code;
1433 s->mpeg_f_code[1][1] = f_code;
1435 s->current_picture.f->pict_type = s->pict_type;
1436 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1438 if (avctx->debug & FF_DEBUG_PICT_INFO)
1439 av_log(avctx, AV_LOG_DEBUG,
1440 "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1447 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1449 MpegEncContext *s = &s1->mpeg_enc_ctx;
1450 int horiz_size_ext, vert_size_ext;
1453 skip_bits(&s->gb, 1); /* profile and level esc*/
1454 s->avctx->profile = get_bits(&s->gb, 3);
1455 s->avctx->level = get_bits(&s->gb, 4);
1456 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1457 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1458 horiz_size_ext = get_bits(&s->gb, 2);
1459 vert_size_ext = get_bits(&s->gb, 2);
1460 s->width |= (horiz_size_ext << 12);
1461 s->height |= (vert_size_ext << 12);
1462 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1463 s->bit_rate += (bit_rate_ext << 18) * 400;
1464 check_marker(&s->gb, "after bit rate extension");
1465 s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1467 s->low_delay = get_bits1(&s->gb);
1468 if (s->flags & CODEC_FLAG_LOW_DELAY)
1471 s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1472 s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1474 ff_dlog(s->avctx, "sequence extension\n");
1475 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1477 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1478 av_log(s->avctx, AV_LOG_DEBUG,
1479 "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%d\n",
1480 s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1481 s->avctx->rc_buffer_size, s->bit_rate);
1484 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1486 MpegEncContext *s = &s1->mpeg_enc_ctx;
1487 int color_description, w, h;
1489 skip_bits(&s->gb, 3); /* video format */
1490 color_description = get_bits1(&s->gb);
1491 if (color_description) {
1492 s->avctx->color_primaries = get_bits(&s->gb, 8);
1493 s->avctx->color_trc = get_bits(&s->gb, 8);
1494 s->avctx->colorspace = get_bits(&s->gb, 8);
1496 w = get_bits(&s->gb, 14);
1497 skip_bits(&s->gb, 1); // marker
1498 h = get_bits(&s->gb, 14);
1499 // remaining 3 bits are zero padding
1501 s1->pan_scan.width = 16 * w;
1502 s1->pan_scan.height = 16 * h;
1504 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1505 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1508 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1510 MpegEncContext *s = &s1->mpeg_enc_ctx;
1514 if (s->progressive_sequence) {
1515 if (s->repeat_first_field) {
1517 if (s->top_field_first)
1521 if (s->picture_structure == PICT_FRAME) {
1523 if (s->repeat_first_field)
1527 for (i = 0; i < nofco; i++) {
1528 s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1529 skip_bits(&s->gb, 1); // marker
1530 s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1531 skip_bits(&s->gb, 1); // marker
1534 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1535 av_log(s->avctx, AV_LOG_DEBUG,
1536 "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1537 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1538 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1539 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1542 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1543 uint16_t matrix1[64], int intra)
1547 for (i = 0; i < 64; i++) {
1548 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1549 int v = get_bits(&s->gb, 8);
1551 av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1552 return AVERROR_INVALIDDATA;
1554 if (intra && i == 0 && v != 8) {
1555 av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1556 v = 8; // needed by pink.mpg / issue1046
1565 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1567 ff_dlog(s->avctx, "matrix extension\n");
1569 if (get_bits1(&s->gb))
1570 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1571 if (get_bits1(&s->gb))
1572 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1573 if (get_bits1(&s->gb))
1574 load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1575 if (get_bits1(&s->gb))
1576 load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1579 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1581 MpegEncContext *s = &s1->mpeg_enc_ctx;
1583 s->full_pel[0] = s->full_pel[1] = 0;
1584 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1585 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1586 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1587 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1588 if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1589 av_log(s->avctx, AV_LOG_ERROR,
1590 "Missing picture start code, guessing missing values\n");
1591 if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1592 if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1593 s->pict_type = AV_PICTURE_TYPE_I;
1595 s->pict_type = AV_PICTURE_TYPE_P;
1597 s->pict_type = AV_PICTURE_TYPE_B;
1598 s->current_picture.f->pict_type = s->pict_type;
1599 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1601 s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1602 s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1603 s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1604 s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1606 s->intra_dc_precision = get_bits(&s->gb, 2);
1607 s->picture_structure = get_bits(&s->gb, 2);
1608 s->top_field_first = get_bits1(&s->gb);
1609 s->frame_pred_frame_dct = get_bits1(&s->gb);
1610 s->concealment_motion_vectors = get_bits1(&s->gb);
1611 s->q_scale_type = get_bits1(&s->gb);
1612 s->intra_vlc_format = get_bits1(&s->gb);
1613 s->alternate_scan = get_bits1(&s->gb);
1614 s->repeat_first_field = get_bits1(&s->gb);
1615 s->chroma_420_type = get_bits1(&s->gb);
1616 s->progressive_frame = get_bits1(&s->gb);
1618 if (s->alternate_scan) {
1619 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1620 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1622 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1623 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1626 /* composite display not parsed */
1627 ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1628 ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1629 ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1630 ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1631 ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1632 ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1633 ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1634 ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1635 ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1638 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1640 AVCodecContext *avctx = s->avctx;
1641 Mpeg1Context *s1 = (Mpeg1Context *) s;
1644 /* start frame decoding */
1645 if (s->first_field || s->picture_structure == PICT_FRAME) {
1646 AVFrameSideData *pan_scan;
1648 if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1651 ff_mpeg_er_frame_start(s);
1653 /* first check if we must repeat the frame */
1654 s->current_picture_ptr->f->repeat_pict = 0;
1655 if (s->repeat_first_field) {
1656 if (s->progressive_sequence) {
1657 if (s->top_field_first)
1658 s->current_picture_ptr->f->repeat_pict = 4;
1660 s->current_picture_ptr->f->repeat_pict = 2;
1661 } else if (s->progressive_frame) {
1662 s->current_picture_ptr->f->repeat_pict = 1;
1666 pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1667 AV_FRAME_DATA_PANSCAN,
1668 sizeof(s1->pan_scan));
1670 return AVERROR(ENOMEM);
1671 memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1673 if (s1->a53_caption) {
1674 AVFrameSideData *sd = av_frame_new_side_data(
1675 s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1676 s1->a53_caption_size);
1678 memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1679 av_freep(&s1->a53_caption);
1682 if (s1->has_stereo3d) {
1683 AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1685 return AVERROR(ENOMEM);
1687 *stereo = s1->stereo3d;
1688 s1->has_stereo3d = 0;
1692 AVFrameSideData *sd =
1693 av_frame_new_side_data(s->current_picture_ptr->f,
1694 AV_FRAME_DATA_AFD, 1);
1696 return AVERROR(ENOMEM);
1698 *sd->data = s1->afd;
1702 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1703 ff_thread_finish_setup(avctx);
1704 } else { // second field
1707 if (!s->current_picture_ptr) {
1708 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1709 return AVERROR_INVALIDDATA;
1712 if (s->avctx->hwaccel &&
1713 (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1714 if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1715 av_log(avctx, AV_LOG_ERROR,
1716 "hardware accelerator failed to decode first field\n");
1719 for (i = 0; i < 4; i++) {
1720 s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1721 if (s->picture_structure == PICT_BOTTOM_FIELD)
1722 s->current_picture.f->data[i] +=
1723 s->current_picture_ptr->f->linesize[i];
1727 if (avctx->hwaccel) {
1728 if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1735 #define DECODE_SLICE_ERROR -1
1736 #define DECODE_SLICE_OK 0
1740 * MpegEncContext.mb_y must be set to the MB row from the startcode.
1741 * @return DECODE_SLICE_ERROR if the slice is damaged,
1742 * DECODE_SLICE_OK if this slice is OK
1744 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1745 const uint8_t **buf, int buf_size)
1747 AVCodecContext *avctx = s->avctx;
1748 const int lowres = s->avctx->lowres;
1749 const int field_pic = s->picture_structure != PICT_FRAME;
1753 s->resync_mb_y = -1;
1755 av_assert0(mb_y < s->mb_height);
1757 init_get_bits(&s->gb, *buf, buf_size * 8);
1758 if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1759 skip_bits(&s->gb, 3);
1761 ff_mpeg1_clean_buffers(s);
1762 s->interlaced_dct = 0;
1764 s->qscale = get_qscale(s);
1766 if (s->qscale == 0) {
1767 av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1768 return AVERROR_INVALIDDATA;
1771 /* extra slice info */
1772 if (skip_1stop_8data_bits(&s->gb) < 0)
1773 return AVERROR_INVALIDDATA;
1777 if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1780 while (get_bits_left(&s->gb) > 0) {
1781 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1782 MBINCR_VLC_BITS, 2);
1784 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1785 return AVERROR_INVALIDDATA;
1790 /* otherwise, stuffing, nothing to do */
1798 if (s->mb_x >= (unsigned) s->mb_width) {
1799 av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1800 return AVERROR_INVALIDDATA;
1803 if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1804 const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1805 int start_code = -1;
1806 buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1807 if (buf_end < *buf + buf_size)
1810 if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1811 return DECODE_SLICE_ERROR;
1813 return DECODE_SLICE_OK;
1816 s->resync_mb_x = s->mb_x;
1817 s->resync_mb_y = s->mb_y = mb_y;
1819 ff_init_block_index(s);
1821 if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1822 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1823 av_log(s->avctx, AV_LOG_DEBUG,
1824 "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",
1826 s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1827 s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1828 s->pict_type == AV_PICTURE_TYPE_I ? "I" :
1829 (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1830 (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1831 s->progressive_sequence ? "ps" : "",
1832 s->progressive_frame ? "pf" : "",
1833 s->alternate_scan ? "alt" : "",
1834 s->top_field_first ? "top" : "",
1835 s->intra_dc_precision, s->picture_structure,
1836 s->frame_pred_frame_dct, s->concealment_motion_vectors,
1837 s->q_scale_type, s->intra_vlc_format,
1838 s->repeat_first_field, s->chroma_420_type ? "420" : "");
1843 // If 1, we memcpy blocks in xvmcvideo.
1844 if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1845 ff_xvmc_init_block(s); // set s->block
1847 if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1850 // Note motion_val is normally NULL unless we want to extract the MVs.
1851 if (s->current_picture.motion_val[0] && !s->encoding) {
1852 const int wrap = s->b8_stride;
1853 int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1854 int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1855 int motion_x, motion_y, dir, i;
1857 for (i = 0; i < 2; i++) {
1858 for (dir = 0; dir < 2; dir++) {
1860 (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1861 motion_x = motion_y = 0;
1862 } else if (s->mv_type == MV_TYPE_16X16 ||
1863 (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1864 motion_x = s->mv[dir][0][0];
1865 motion_y = s->mv[dir][0][1];
1866 } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1867 motion_x = s->mv[dir][i][0];
1868 motion_y = s->mv[dir][i][1];
1871 s->current_picture.motion_val[dir][xy][0] = motion_x;
1872 s->current_picture.motion_val[dir][xy][1] = motion_y;
1873 s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1874 s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1875 s->current_picture.ref_index [dir][b8_xy] =
1876 s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1877 av_assert2(s->field_select[dir][i] == 0 ||
1878 s->field_select[dir][i] == 1);
1885 s->dest[0] += 16 >> lowres;
1886 s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1887 s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1889 ff_mpv_decode_mb(s, s->block);
1891 if (++s->mb_x >= s->mb_width) {
1892 const int mb_size = 16 >> s->avctx->lowres;
1894 ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1895 ff_mpv_report_decode_progress(s);
1898 s->mb_y += 1 << field_pic;
1900 if (s->mb_y >= s->mb_height) {
1901 int left = get_bits_left(&s->gb);
1902 int is_d10 = s->chroma_format == 2 &&
1903 s->pict_type == AV_PICTURE_TYPE_I &&
1904 avctx->profile == 0 && avctx->level == 5 &&
1905 s->intra_dc_precision == 2 &&
1906 s->q_scale_type == 1 && s->alternate_scan == 0 &&
1907 s->progressive_frame == 0
1908 /* vbv_delay == 0xBBB || 0xE10 */;
1910 if (left >= 32 && !is_d10) {
1911 GetBitContext gb = s->gb;
1912 align_get_bits(&gb);
1913 if (show_bits(&gb, 24) == 0x060E2B) {
1914 av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1920 (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1921 ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1922 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
1923 left, show_bits(&s->gb, FFMIN(left, 23)));
1924 return AVERROR_INVALIDDATA;
1928 // There are some files out there which are missing the last slice
1929 // in cases where the slice is completely outside the visible
1930 // area, we detect this here instead of running into the end expecting
1932 if (s->mb_y >= ((s->height + 15) >> 4) &&
1933 s->progressive_frame &&
1934 !s->progressive_sequence &&
1935 get_bits_left(&s->gb) <= 8 &&
1936 get_bits_left(&s->gb) >= 0 &&
1937 s->mb_skip_run == -1 &&
1938 show_bits(&s->gb, 8) == 0)
1941 ff_init_block_index(s);
1944 /* skip mb handling */
1945 if (s->mb_skip_run == -1) {
1946 /* read increment again */
1949 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1950 MBINCR_VLC_BITS, 2);
1952 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1953 return AVERROR_INVALIDDATA;
1957 s->mb_skip_run += 33;
1958 } else if (code == 35) {
1959 if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1960 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1961 return AVERROR_INVALIDDATA;
1963 goto eos; /* end of slice */
1965 /* otherwise, stuffing, nothing to do */
1967 s->mb_skip_run += code;
1971 if (s->mb_skip_run) {
1973 if (s->pict_type == AV_PICTURE_TYPE_I) {
1974 av_log(s->avctx, AV_LOG_ERROR,
1975 "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1976 return AVERROR_INVALIDDATA;
1981 for (i = 0; i < 12; i++)
1982 s->block_last_index[i] = -1;
1983 if (s->picture_structure == PICT_FRAME)
1984 s->mv_type = MV_TYPE_16X16;
1986 s->mv_type = MV_TYPE_FIELD;
1987 if (s->pict_type == AV_PICTURE_TYPE_P) {
1988 /* if P type, zero motion vector is implied */
1989 s->mv_dir = MV_DIR_FORWARD;
1990 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1991 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1992 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1993 s->field_select[0][0] = (s->picture_structure - 1) & 1;
1995 /* if B type, reuse previous vectors and directions */
1996 s->mv[0][0][0] = s->last_mv[0][0][0];
1997 s->mv[0][0][1] = s->last_mv[0][0][1];
1998 s->mv[1][0][0] = s->last_mv[1][0][0];
1999 s->mv[1][0][1] = s->last_mv[1][0][1];
2004 eos: // end of slice
2005 if (get_bits_left(&s->gb) < 0) {
2006 av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
2007 return AVERROR_INVALIDDATA;
2009 *buf += (get_bits_count(&s->gb) - 1) / 8;
2010 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);
2014 static int slice_decode_thread(AVCodecContext *c, void *arg)
2016 MpegEncContext *s = *(void **) arg;
2017 const uint8_t *buf = s->gb.buffer;
2018 int mb_y = s->start_mb_y;
2019 const int field_pic = s->picture_structure != PICT_FRAME;
2021 s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
2024 uint32_t start_code;
2027 ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
2029 ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2030 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
2031 s->start_mb_y, s->end_mb_y, s->er.error_count);
2033 if (c->err_recognition & AV_EF_EXPLODE)
2035 if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2036 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2038 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2040 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2041 s->mb_x - 1, s->mb_y,
2042 ER_AC_END | ER_DC_END | ER_MV_END);
2045 if (s->mb_y == s->end_mb_y)
2049 buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2050 mb_y = start_code - SLICE_MIN_START_CODE;
2051 if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2052 mb_y += (*buf&0xE0)<<2;
2054 if (s->picture_structure == PICT_BOTTOM_FIELD)
2056 if (mb_y < 0 || mb_y >= s->end_mb_y)
2057 return AVERROR_INVALIDDATA;
2062 * Handle slice ends.
2063 * @return 1 if it seems to be the last slice
2065 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2067 Mpeg1Context *s1 = avctx->priv_data;
2068 MpegEncContext *s = &s1->mpeg_enc_ctx;
2070 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2073 if (s->avctx->hwaccel) {
2074 if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
2075 av_log(avctx, AV_LOG_ERROR,
2076 "hardware accelerator failed to decode picture\n");
2079 /* end of slice reached */
2080 if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2083 ff_er_frame_end(&s->er);
2085 ff_mpv_frame_end(s);
2087 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2088 int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2091 ff_print_debug_info(s, s->current_picture_ptr, pict);
2092 ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2094 if (avctx->active_thread_type & FF_THREAD_FRAME)
2095 s->picture_number++;
2096 /* latency of 1 frame for I- and P-frames */
2097 /* XXX: use another variable than picture_number */
2098 if (s->last_picture_ptr) {
2099 int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2102 ff_print_debug_info(s, s->last_picture_ptr, pict);
2103 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2113 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2114 const uint8_t *buf, int buf_size)
2116 Mpeg1Context *s1 = avctx->priv_data;
2117 MpegEncContext *s = &s1->mpeg_enc_ctx;
2121 init_get_bits(&s->gb, buf, buf_size * 8);
2123 width = get_bits(&s->gb, 12);
2124 height = get_bits(&s->gb, 12);
2125 if (width == 0 || height == 0) {
2126 av_log(avctx, AV_LOG_WARNING,
2127 "Invalid horizontal or vertical size value.\n");
2128 if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2129 return AVERROR_INVALIDDATA;
2131 s->aspect_ratio_info = get_bits(&s->gb, 4);
2132 if (s->aspect_ratio_info == 0) {
2133 av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2134 if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2135 return AVERROR_INVALIDDATA;
2137 s->frame_rate_index = get_bits(&s->gb, 4);
2138 if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2139 av_log(avctx, AV_LOG_WARNING,
2140 "frame_rate_index %d is invalid\n", s->frame_rate_index);
2141 s->frame_rate_index = 1;
2143 s->bit_rate = get_bits(&s->gb, 18) * 400;
2144 if (check_marker(&s->gb, "in sequence header") == 0) {
2145 return AVERROR_INVALIDDATA;
2150 s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2151 skip_bits(&s->gb, 1);
2154 if (get_bits1(&s->gb)) {
2155 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2157 for (i = 0; i < 64; i++) {
2158 j = s->idsp.idct_permutation[i];
2159 v = ff_mpeg1_default_intra_matrix[i];
2160 s->intra_matrix[j] = v;
2161 s->chroma_intra_matrix[j] = v;
2164 if (get_bits1(&s->gb)) {
2165 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2167 for (i = 0; i < 64; i++) {
2168 int j = s->idsp.idct_permutation[i];
2169 v = ff_mpeg1_default_non_intra_matrix[i];
2170 s->inter_matrix[j] = v;
2171 s->chroma_inter_matrix[j] = v;
2175 if (show_bits(&s->gb, 23) != 0) {
2176 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2177 return AVERROR_INVALIDDATA;
2180 /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2181 s->progressive_sequence = 1;
2182 s->progressive_frame = 1;
2183 s->picture_structure = PICT_FRAME;
2185 s->frame_pred_frame_dct = 1;
2186 s->chroma_format = 1;
2188 s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2189 s->out_format = FMT_MPEG1;
2190 s->swap_uv = 0; // AFAIK VCR2 does not have SEQ_HEADER
2191 if (s->flags & CODEC_FLAG_LOW_DELAY)
2194 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2195 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d, aspect_ratio_info: %d \n",
2196 s->avctx->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2201 static int vcr2_init_sequence(AVCodecContext *avctx)
2203 Mpeg1Context *s1 = avctx->priv_data;
2204 MpegEncContext *s = &s1->mpeg_enc_ctx;
2207 /* start new MPEG-1 context decoding */
2208 s->out_format = FMT_MPEG1;
2209 if (s1->mpeg_enc_ctx_allocated) {
2210 ff_mpv_common_end(s);
2211 s1->mpeg_enc_ctx_allocated = 0;
2213 s->width = avctx->coded_width;
2214 s->height = avctx->coded_height;
2215 avctx->has_b_frames = 0; // true?
2218 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2219 setup_hwaccel_for_pixfmt(avctx);
2221 ff_mpv_idct_init(s);
2222 if ((ret = ff_mpv_common_init(s)) < 0)
2224 s1->mpeg_enc_ctx_allocated = 1;
2226 for (i = 0; i < 64; i++) {
2227 int j = s->idsp.idct_permutation[i];
2228 v = ff_mpeg1_default_intra_matrix[i];
2229 s->intra_matrix[j] = v;
2230 s->chroma_intra_matrix[j] = v;
2232 v = ff_mpeg1_default_non_intra_matrix[i];
2233 s->inter_matrix[j] = v;
2234 s->chroma_inter_matrix[j] = v;
2237 s->progressive_sequence = 1;
2238 s->progressive_frame = 1;
2239 s->picture_structure = PICT_FRAME;
2241 s->frame_pred_frame_dct = 1;
2242 s->chroma_format = 1;
2243 if (s->codec_tag == AV_RL32("BW10")) {
2244 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2246 s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2247 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2249 s1->save_width = s->width;
2250 s1->save_height = s->height;
2251 s1->save_progressive_seq = s->progressive_sequence;
2255 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2256 const uint8_t *p, int buf_size)
2258 Mpeg1Context *s1 = avctx->priv_data;
2260 if (buf_size >= 6 &&
2261 p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2262 p[4] == 3 && (p[5] & 0x40)) {
2263 /* extract A53 Part 4 CC data */
2264 int cc_count = p[5] & 0x1f;
2265 if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2266 av_freep(&s1->a53_caption);
2267 s1->a53_caption_size = cc_count * 3;
2268 s1->a53_caption = av_malloc(s1->a53_caption_size);
2269 if (s1->a53_caption)
2270 memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2273 } else if (buf_size >= 11 &&
2274 p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2275 /* extract DVD CC data */
2278 // There is a caption count field in the data, but it is often
2279 // incorect. So count the number of captions present.
2280 for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2282 // Transform the DVD format into A53 Part 4 format
2284 av_freep(&s1->a53_caption);
2285 s1->a53_caption_size = cc_count * 6;
2286 s1->a53_caption = av_malloc(s1->a53_caption_size);
2287 if (s1->a53_caption) {
2288 uint8_t field1 = !!(p[4] & 0x80);
2289 uint8_t *cap = s1->a53_caption;
2291 for (i = 0; i < cc_count; i++) {
2292 cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2295 cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2308 static void mpeg_decode_user_data(AVCodecContext *avctx,
2309 const uint8_t *p, int buf_size)
2311 Mpeg1Context *s = avctx->priv_data;
2312 const uint8_t *buf_end = p + buf_size;
2313 Mpeg1Context *s1 = avctx->priv_data;
2317 for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2318 av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2320 av_log(avctx, AV_LOG_ERROR, "\n");
2326 if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2330 /* we parse the DTG active format information */
2331 if (buf_end - p >= 5 &&
2332 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2340 if (buf_end - p < 1)
2343 FF_DISABLE_DEPRECATION_WARNINGS
2344 avctx->dtg_active_format = p[0] & 0x0f;
2345 FF_ENABLE_DEPRECATION_WARNINGS
2346 #endif /* FF_API_AFD */
2348 s1->afd = p[0] & 0x0f;
2350 } else if (buf_end - p >= 6 &&
2351 p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2352 p[4] == 0x03) { // S3D_video_format_length
2353 // the 0x7F mask ignores the reserved_bit value
2354 const uint8_t S3D_video_format_type = p[5] & 0x7F;
2356 if (S3D_video_format_type == 0x03 ||
2357 S3D_video_format_type == 0x04 ||
2358 S3D_video_format_type == 0x08 ||
2359 S3D_video_format_type == 0x23) {
2361 s1->has_stereo3d = 1;
2363 switch (S3D_video_format_type) {
2365 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2368 s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2371 s1->stereo3d.type = AV_STEREO3D_2D;
2374 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2378 } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2383 static void mpeg_decode_gop(AVCodecContext *avctx,
2384 const uint8_t *buf, int buf_size)
2386 Mpeg1Context *s1 = avctx->priv_data;
2387 MpegEncContext *s = &s1->mpeg_enc_ctx;
2391 init_get_bits(&s->gb, buf, buf_size * 8);
2393 tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2395 s->closed_gop = get_bits1(&s->gb);
2396 /* broken_link indicate that after editing the
2397 * reference frames of the first B-Frames after GOP I-Frame
2398 * are missing (open gop) */
2399 broken_link = get_bits1(&s->gb);
2401 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2402 char tcbuf[AV_TIMECODE_STR_SIZE];
2403 av_timecode_make_mpeg_tc_string(tcbuf, tc);
2404 av_log(s->avctx, AV_LOG_DEBUG,
2405 "GOP (%s) closed_gop=%d broken_link=%d\n",
2406 tcbuf, s->closed_gop, broken_link);
2410 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2411 int *got_output, const uint8_t *buf, int buf_size)
2413 Mpeg1Context *s = avctx->priv_data;
2414 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2415 const uint8_t *buf_ptr = buf;
2416 const uint8_t *buf_end = buf + buf_size;
2417 int ret, input_size;
2418 int last_code = 0, skip_frame = 0;
2419 int picture_start_code_seen = 0;
2422 /* find next start code */
2423 uint32_t start_code = -1;
2424 buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2425 if (start_code > 0x1ff) {
2428 (avctx->active_thread_type & FF_THREAD_SLICE) &&
2431 av_assert0(avctx->thread_count > 1);
2433 avctx->execute(avctx, slice_decode_thread,
2434 &s2->thread_context[0], NULL,
2435 s->slice_count, sizeof(void *));
2436 for (i = 0; i < s->slice_count; i++)
2437 s2->er.error_count += s2->thread_context[i]->er.error_count;
2440 if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
2441 && uses_vdpau(avctx))
2442 ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2444 ret = slice_end(avctx, picture);
2448 // FIXME: merge with the stuff in mpeg_decode_slice
2449 if (s2->last_picture_ptr || s2->low_delay)
2455 if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2456 return AVERROR_INVALIDDATA;
2458 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2461 input_size = buf_end - buf_ptr;
2463 if (avctx->debug & FF_DEBUG_STARTCODE)
2464 av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2465 start_code, buf_ptr - buf, input_size);
2467 /* prepare data for next start code */
2468 switch (start_code) {
2469 case SEQ_START_CODE:
2470 if (last_code == 0) {
2471 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2472 if (buf != avctx->extradata)
2475 av_log(avctx, AV_LOG_ERROR,
2476 "ignoring SEQ_START_CODE after %X\n", last_code);
2477 if (avctx->err_recognition & AV_EF_EXPLODE)
2478 return AVERROR_INVALIDDATA;
2482 case PICTURE_START_CODE:
2483 if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2484 /* If it's a frame picture, there can't be more than one picture header.
2485 Yet, it does happen and we need to handle it. */
2486 av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2489 picture_start_code_seen = 1;
2491 if (s2->width <= 0 || s2->height <= 0) {
2492 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2493 s2->width, s2->height);
2494 return AVERROR_INVALIDDATA;
2498 s2->intra_dc_precision= 3;
2499 s2->intra_matrix[0]= 1;
2501 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2502 !avctx->hwaccel && s->slice_count) {
2505 avctx->execute(avctx, slice_decode_thread,
2506 s2->thread_context, NULL,
2507 s->slice_count, sizeof(void *));
2508 for (i = 0; i < s->slice_count; i++)
2509 s2->er.error_count += s2->thread_context[i]->er.error_count;
2512 if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2513 ret = mpeg_decode_postinit(avctx);
2515 av_log(avctx, AV_LOG_ERROR,
2516 "mpeg_decode_postinit() failure\n");
2520 /* We have a complete image: we try to decompress it. */
2521 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2524 last_code = PICTURE_START_CODE;
2526 av_log(avctx, AV_LOG_ERROR,
2527 "ignoring pic after %X\n", last_code);
2528 if (avctx->err_recognition & AV_EF_EXPLODE)
2529 return AVERROR_INVALIDDATA;
2532 case EXT_START_CODE:
2533 init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2535 switch (get_bits(&s2->gb, 4)) {
2537 if (last_code == 0) {
2538 mpeg_decode_sequence_extension(s);
2540 av_log(avctx, AV_LOG_ERROR,
2541 "ignoring seq ext after %X\n", last_code);
2542 if (avctx->err_recognition & AV_EF_EXPLODE)
2543 return AVERROR_INVALIDDATA;
2547 mpeg_decode_sequence_display_extension(s);
2550 mpeg_decode_quant_matrix_extension(s2);
2553 mpeg_decode_picture_display_extension(s);
2556 if (last_code == PICTURE_START_CODE) {
2557 mpeg_decode_picture_coding_extension(s);
2559 av_log(avctx, AV_LOG_ERROR,
2560 "ignoring pic cod ext after %X\n", last_code);
2561 if (avctx->err_recognition & AV_EF_EXPLODE)
2562 return AVERROR_INVALIDDATA;
2567 case USER_START_CODE:
2568 mpeg_decode_user_data(avctx, buf_ptr, input_size);
2570 case GOP_START_CODE:
2571 if (last_code == 0) {
2572 s2->first_field = 0;
2573 mpeg_decode_gop(avctx, buf_ptr, input_size);
2576 av_log(avctx, AV_LOG_ERROR,
2577 "ignoring GOP_START_CODE after %X\n", last_code);
2578 if (avctx->err_recognition & AV_EF_EXPLODE)
2579 return AVERROR_INVALIDDATA;
2583 if (start_code >= SLICE_MIN_START_CODE &&
2584 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2585 if (s2->progressive_sequence && !s2->progressive_frame) {
2586 s2->progressive_frame = 1;
2587 av_log(s2->avctx, AV_LOG_ERROR,
2588 "interlaced frame in progressive sequence, ignoring\n");
2591 if (s2->picture_structure == 0 ||
2592 (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2593 av_log(s2->avctx, AV_LOG_ERROR,
2594 "picture_structure %d invalid, ignoring\n",
2595 s2->picture_structure);
2596 s2->picture_structure = PICT_FRAME;
2599 if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2600 av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2602 if (s2->picture_structure == PICT_FRAME) {
2603 s2->first_field = 0;
2604 s2->v_edge_pos = 16 * s2->mb_height;
2606 s2->first_field ^= 1;
2607 s2->v_edge_pos = 8 * s2->mb_height;
2608 memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2611 if (start_code >= SLICE_MIN_START_CODE &&
2612 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2613 const int field_pic = s2->picture_structure != PICT_FRAME;
2614 int mb_y = start_code - SLICE_MIN_START_CODE;
2615 last_code = SLICE_MIN_START_CODE;
2616 if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2617 mb_y += (*buf_ptr&0xE0)<<2;
2620 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2623 if (buf_end - buf_ptr < 2) {
2624 av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2625 return AVERROR_INVALIDDATA;
2628 if (mb_y >= s2->mb_height) {
2629 av_log(s2->avctx, AV_LOG_ERROR,
2630 "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2631 return AVERROR_INVALIDDATA;
2634 if (!s2->last_picture_ptr) {
2635 /* Skip B-frames if we do not have reference frames and
2636 * GOP is not closed. */
2637 if (s2->pict_type == AV_PICTURE_TYPE_B) {
2638 if (!s2->closed_gop) {
2644 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
2646 if (!s2->next_picture_ptr) {
2647 /* Skip P-frames if we do not have a reference frame or
2648 * we have an invalid header. */
2649 if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2654 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2655 s2->pict_type == AV_PICTURE_TYPE_B) ||
2656 (avctx->skip_frame >= AVDISCARD_NONKEY &&
2657 s2->pict_type != AV_PICTURE_TYPE_I) ||
2658 avctx->skip_frame >= AVDISCARD_ALL) {
2663 if (!s->mpeg_enc_ctx_allocated)
2666 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2667 if (mb_y < avctx->skip_top ||
2668 mb_y >= s2->mb_height - avctx->skip_bottom)
2672 if (!s2->pict_type) {
2673 av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2674 if (avctx->err_recognition & AV_EF_EXPLODE)
2675 return AVERROR_INVALIDDATA;
2679 if (s->first_slice) {
2682 if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2685 if (!s2->current_picture_ptr) {
2686 av_log(avctx, AV_LOG_ERROR,
2687 "current_picture not initialized\n");
2688 return AVERROR_INVALIDDATA;
2691 if (uses_vdpau(avctx)) {
2697 (avctx->active_thread_type & FF_THREAD_SLICE) &&
2699 int threshold = (s2->mb_height * s->slice_count +
2700 s2->slice_context_count / 2) /
2701 s2->slice_context_count;
2702 av_assert0(avctx->thread_count > 1);
2703 if (threshold <= mb_y) {
2704 MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2706 thread_context->start_mb_y = mb_y;
2707 thread_context->end_mb_y = s2->mb_height;
2708 if (s->slice_count) {
2709 s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2710 ret = ff_update_duplicate_context(thread_context, s2);
2714 init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2717 buf_ptr += 2; // FIXME add minimum number of bytes per slice
2719 ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2723 if (avctx->err_recognition & AV_EF_EXPLODE)
2725 if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2726 ff_er_add_slice(&s2->er, s2->resync_mb_x,
2727 s2->resync_mb_y, s2->mb_x, s2->mb_y,
2728 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2730 ff_er_add_slice(&s2->er, s2->resync_mb_x,
2731 s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2732 ER_AC_END | ER_DC_END | ER_MV_END);
2741 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2742 int *got_output, AVPacket *avpkt)
2744 const uint8_t *buf = avpkt->data;
2746 int buf_size = avpkt->size;
2747 Mpeg1Context *s = avctx->priv_data;
2748 AVFrame *picture = data;
2749 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2751 if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2752 /* special case for last picture */
2753 if (s2->low_delay == 0 && s2->next_picture_ptr) {
2754 int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2758 s2->next_picture_ptr = NULL;
2765 if (s2->flags & CODEC_FLAG_TRUNCATED) {
2766 int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2769 if (ff_combine_frame(&s2->parse_context, next,
2770 (const uint8_t **) &buf, &buf_size) < 0)
2774 s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2775 if (s->mpeg_enc_ctx_allocated == 0 && ( s2->codec_tag == AV_RL32("VCR2")
2776 || s2->codec_tag == AV_RL32("BW10")
2778 vcr2_init_sequence(avctx);
2782 if (avctx->extradata && !s->extradata_decoded) {
2783 ret = decode_chunks(avctx, picture, got_output,
2784 avctx->extradata, avctx->extradata_size);
2786 av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2789 s->extradata_decoded = 1;
2790 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2791 s2->current_picture_ptr = NULL;
2796 ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2797 if (ret<0 || *got_output)
2798 s2->current_picture_ptr = NULL;
2803 static void flush(AVCodecContext *avctx)
2805 Mpeg1Context *s = avctx->priv_data;
2809 ff_mpeg_flush(avctx);
2812 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2814 Mpeg1Context *s = avctx->priv_data;
2816 if (s->mpeg_enc_ctx_allocated)
2817 ff_mpv_common_end(&s->mpeg_enc_ctx);
2818 av_freep(&s->a53_caption);
2822 static const AVProfile mpeg2_video_profiles[] = {
2823 { FF_PROFILE_MPEG2_422, "4:2:2" },
2824 { FF_PROFILE_MPEG2_HIGH, "High" },
2825 { FF_PROFILE_MPEG2_SS, "Spatially Scalable" },
2826 { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable" },
2827 { FF_PROFILE_MPEG2_MAIN, "Main" },
2828 { FF_PROFILE_MPEG2_SIMPLE, "Simple" },
2829 { FF_PROFILE_RESERVED, "Reserved" },
2830 { FF_PROFILE_RESERVED, "Reserved" },
2831 { FF_PROFILE_UNKNOWN },
2834 AVCodec ff_mpeg1video_decoder = {
2835 .name = "mpeg1video",
2836 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2837 .type = AVMEDIA_TYPE_VIDEO,
2838 .id = AV_CODEC_ID_MPEG1VIDEO,
2839 .priv_data_size = sizeof(Mpeg1Context),
2840 .init = mpeg_decode_init,
2841 .close = mpeg_decode_end,
2842 .decode = mpeg_decode_frame,
2843 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2844 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2845 CODEC_CAP_SLICE_THREADS,
2848 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2851 AVCodec ff_mpeg2video_decoder = {
2852 .name = "mpeg2video",
2853 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2854 .type = AVMEDIA_TYPE_VIDEO,
2855 .id = AV_CODEC_ID_MPEG2VIDEO,
2856 .priv_data_size = sizeof(Mpeg1Context),
2857 .init = mpeg_decode_init,
2858 .close = mpeg_decode_end,
2859 .decode = mpeg_decode_frame,
2860 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2861 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2862 CODEC_CAP_SLICE_THREADS,
2865 .profiles = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2869 AVCodec ff_mpegvideo_decoder = {
2870 .name = "mpegvideo",
2871 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2872 .type = AVMEDIA_TYPE_VIDEO,
2873 .id = AV_CODEC_ID_MPEG2VIDEO,
2874 .priv_data_size = sizeof(Mpeg1Context),
2875 .init = mpeg_decode_init,
2876 .close = mpeg_decode_end,
2877 .decode = mpeg_decode_frame,
2878 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2884 #if CONFIG_MPEG_XVMC_DECODER
2885 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2887 if (avctx->active_thread_type & FF_THREAD_SLICE)
2889 if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2891 if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2892 ff_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2894 mpeg_decode_init(avctx);
2896 avctx->pix_fmt = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2897 avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2902 AVCodec ff_mpeg_xvmc_decoder = {
2903 .name = "mpegvideo_xvmc",
2904 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2905 .type = AVMEDIA_TYPE_VIDEO,
2906 .id = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2907 .priv_data_size = sizeof(Mpeg1Context),
2908 .init = mpeg_mc_decode_init,
2909 .close = mpeg_decode_end,
2910 .decode = mpeg_decode_frame,
2911 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2912 CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2917 #endif /* FF_API_XVMC */
2919 #if CONFIG_MPEG_VDPAU_DECODER
2920 AVCodec ff_mpeg_vdpau_decoder = {
2921 .name = "mpegvideo_vdpau",
2922 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2923 .type = AVMEDIA_TYPE_VIDEO,
2924 .id = AV_CODEC_ID_MPEG2VIDEO,
2925 .priv_data_size = sizeof(Mpeg1Context),
2926 .init = mpeg_decode_init,
2927 .close = mpeg_decode_end,
2928 .decode = mpeg_decode_frame,
2929 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2930 CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2935 #if CONFIG_MPEG1_VDPAU_DECODER
2936 AVCodec ff_mpeg1_vdpau_decoder = {
2937 .name = "mpeg1video_vdpau",
2938 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2939 .type = AVMEDIA_TYPE_VIDEO,
2940 .id = AV_CODEC_ID_MPEG1VIDEO,
2941 .priv_data_size = sizeof(Mpeg1Context),
2942 .init = mpeg_decode_init,
2943 .close = mpeg_decode_end,
2944 .decode = mpeg_decode_frame,
2945 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2946 CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,