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/internal.h"
33 #include "libavutil/stereo3d.h"
36 #include "bytestream.h"
37 #include "error_resilience.h"
42 #include "mpeg12data.h"
43 #include "mpegutils.h"
44 #include "mpegvideo.h"
47 #include "vdpau_internal.h"
48 #include "xvmc_internal.h"
50 typedef struct Mpeg1Context {
51 MpegEncContext mpeg_enc_ctx;
52 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
53 int repeat_field; /* true if we must repeat the field */
54 AVPanScan pan_scan; /* some temporary storage for the panscan */
63 int save_width, save_height, save_progressive_seq;
64 AVRational frame_rate_ext; /* MPEG-2 specific framerate modificator */
65 int sync; /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
68 int extradata_decoded;
71 #define MB_TYPE_ZERO_MV 0x20000000
73 static const uint32_t ptype2mb_type[7] = {
75 MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
77 MB_TYPE_L0 | MB_TYPE_CBP,
78 MB_TYPE_QUANT | MB_TYPE_INTRA,
79 MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
80 MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
83 static const uint32_t btype2mb_type[11] = {
86 MB_TYPE_L1 | MB_TYPE_CBP,
88 MB_TYPE_L0 | MB_TYPE_CBP,
90 MB_TYPE_L0L1 | MB_TYPE_CBP,
91 MB_TYPE_QUANT | MB_TYPE_INTRA,
92 MB_TYPE_QUANT | MB_TYPE_L1 | MB_TYPE_CBP,
93 MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
94 MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
97 static const uint8_t non_linear_qscale[32] = {
98 0, 1, 2, 3, 4, 5, 6, 7,
99 8, 10, 12, 14, 16, 18, 20, 22,
100 24, 28, 32, 36, 40, 44, 48, 52,
101 56, 64, 72, 80, 88, 96, 104, 112,
104 /* as H.263, but only 17 codes */
105 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
107 int code, sign, val, shift;
109 code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
115 sign = get_bits1(&s->gb);
119 val = (val - 1) << shift;
120 val |= get_bits(&s->gb, shift);
127 /* modulo decoding */
128 return sign_extend(val, 5 + shift);
131 #define check_scantable_index(ctx, x) \
134 av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", \
135 ctx->mb_x, ctx->mb_y); \
136 return AVERROR_INVALIDDATA; \
140 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
141 int16_t *block, int n)
143 int level, dc, diff, i, j, run;
145 RLTable *rl = &ff_rl_mpeg1;
146 uint8_t *const scantable = s->intra_scantable.permutated;
147 const uint16_t *quant_matrix = s->intra_matrix;
148 const int qscale = s->qscale;
151 component = (n <= 3 ? 0 : n - 4 + 1);
152 diff = decode_dc(&s->gb, component);
155 dc = s->last_dc[component];
157 s->last_dc[component] = dc;
158 block[0] = dc * quant_matrix[0];
159 av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
162 OPEN_READER(re, &s->gb);
163 UPDATE_CACHE(re, &s->gb);
164 if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
167 /* now quantify & encode AC coefficients */
169 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
174 check_scantable_index(s, i);
176 level = (level * qscale * quant_matrix[j]) >> 4;
177 level = (level - 1) | 1;
178 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
179 SHOW_SBITS(re, &s->gb, 1);
180 SKIP_BITS(re, &s->gb, 1);
183 run = SHOW_UBITS(re, &s->gb, 6) + 1;
184 LAST_SKIP_BITS(re, &s->gb, 6);
185 UPDATE_CACHE(re, &s->gb);
186 level = SHOW_SBITS(re, &s->gb, 8);
187 SKIP_BITS(re, &s->gb, 8);
189 level = SHOW_UBITS(re, &s->gb, 8) - 256;
190 SKIP_BITS(re, &s->gb, 8);
191 } else if (level == 0) {
192 level = SHOW_UBITS(re, &s->gb, 8);
193 SKIP_BITS(re, &s->gb, 8);
196 check_scantable_index(s, i);
200 level = (level * qscale * quant_matrix[j]) >> 4;
201 level = (level - 1) | 1;
204 level = (level * qscale * quant_matrix[j]) >> 4;
205 level = (level - 1) | 1;
210 if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
213 UPDATE_CACHE(re, &s->gb);
216 LAST_SKIP_BITS(re, &s->gb, 2);
217 CLOSE_READER(re, &s->gb);
219 s->block_last_index[n] = i;
223 int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
225 return mpeg1_decode_block_intra(s, block, n);
228 static inline int mpeg1_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 uint16_t *quant_matrix = s->inter_matrix;
235 const int qscale = s->qscale;
238 OPEN_READER(re, &s->gb);
240 // special case for first coefficient, no need to add second VLC table
241 UPDATE_CACHE(re, &s->gb);
242 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
243 level = (3 * qscale * quant_matrix[0]) >> 5;
244 level = (level - 1) | 1;
245 if (GET_CACHE(re, &s->gb) & 0x40000000)
249 SKIP_BITS(re, &s->gb, 2);
250 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],
260 check_scantable_index(s, i);
262 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
263 level = (level - 1) | 1;
264 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
265 SHOW_SBITS(re, &s->gb, 1);
266 SKIP_BITS(re, &s->gb, 1);
269 run = SHOW_UBITS(re, &s->gb, 6) + 1;
270 LAST_SKIP_BITS(re, &s->gb, 6);
271 UPDATE_CACHE(re, &s->gb);
272 level = SHOW_SBITS(re, &s->gb, 8);
273 SKIP_BITS(re, &s->gb, 8);
275 level = SHOW_UBITS(re, &s->gb, 8) - 256;
276 SKIP_BITS(re, &s->gb, 8);
277 } else if (level == 0) {
278 level = SHOW_UBITS(re, &s->gb, 8);
279 SKIP_BITS(re, &s->gb, 8);
282 check_scantable_index(s, i);
286 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
287 level = (level - 1) | 1;
290 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
291 level = (level - 1) | 1;
296 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
298 UPDATE_CACHE(re, &s->gb);
301 LAST_SKIP_BITS(re, &s->gb, 2);
302 CLOSE_READER(re, &s->gb);
304 s->block_last_index[n] = i;
309 * Note: this function can read out of range and crash for corrupt streams.
310 * Changing this would eat up any speed benefits it has.
311 * Do not use "fast" flag if you need the code to be robust.
313 static inline int mpeg1_fast_decode_block_inter(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 int qscale = s->qscale;
322 OPEN_READER(re, &s->gb);
324 // Special case for first coefficient, no need to add second VLC table.
325 UPDATE_CACHE(re, &s->gb);
326 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
327 level = (3 * qscale) >> 1;
328 level = (level - 1) | 1;
329 if (GET_CACHE(re, &s->gb) & 0x40000000)
333 SKIP_BITS(re, &s->gb, 2);
334 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
338 /* now quantify & encode AC coefficients */
340 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
345 check_scantable_index(s, i);
347 level = ((level * 2 + 1) * qscale) >> 1;
348 level = (level - 1) | 1;
349 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
350 SHOW_SBITS(re, &s->gb, 1);
351 SKIP_BITS(re, &s->gb, 1);
354 run = SHOW_UBITS(re, &s->gb, 6) + 1;
355 LAST_SKIP_BITS(re, &s->gb, 6);
356 UPDATE_CACHE(re, &s->gb);
357 level = SHOW_SBITS(re, &s->gb, 8);
358 SKIP_BITS(re, &s->gb, 8);
360 level = SHOW_UBITS(re, &s->gb, 8) - 256;
361 SKIP_BITS(re, &s->gb, 8);
362 } else if (level == 0) {
363 level = SHOW_UBITS(re, &s->gb, 8);
364 SKIP_BITS(re, &s->gb, 8);
367 check_scantable_index(s, i);
371 level = ((level * 2 + 1) * qscale) >> 1;
372 level = (level - 1) | 1;
375 level = ((level * 2 + 1) * qscale) >> 1;
376 level = (level - 1) | 1;
381 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
383 UPDATE_CACHE(re, &s->gb);
386 LAST_SKIP_BITS(re, &s->gb, 2);
387 CLOSE_READER(re, &s->gb);
389 s->block_last_index[n] = i;
393 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
394 int16_t *block, int n)
396 int level, i, j, run;
397 RLTable *rl = &ff_rl_mpeg1;
398 uint8_t *const scantable = s->intra_scantable.permutated;
399 const uint16_t *quant_matrix;
400 const int qscale = s->qscale;
406 OPEN_READER(re, &s->gb);
409 quant_matrix = s->inter_matrix;
411 quant_matrix = s->chroma_inter_matrix;
413 // Special case for first coefficient, no need to add second VLC table.
414 UPDATE_CACHE(re, &s->gb);
415 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
416 level = (3 * qscale * quant_matrix[0]) >> 5;
417 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],
434 check_scantable_index(s, i);
436 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
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);
449 check_scantable_index(s, i);
452 level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
455 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
461 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
463 UPDATE_CACHE(re, &s->gb);
466 LAST_SKIP_BITS(re, &s->gb, 2);
467 CLOSE_READER(re, &s->gb);
469 block[63] ^= (mismatch & 1);
471 s->block_last_index[n] = i;
476 * Note: this function can read out of range and crash for corrupt streams.
477 * Changing this would eat up any speed benefits it has.
478 * Do not use "fast" flag if you need the code to be robust.
480 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
481 int16_t *block, int n)
483 int level, i, j, run;
484 RLTable *rl = &ff_rl_mpeg1;
485 uint8_t *const scantable = s->intra_scantable.permutated;
486 const int qscale = s->qscale;
487 OPEN_READER(re, &s->gb);
490 // special case for first coefficient, no need to add second VLC table
491 UPDATE_CACHE(re, &s->gb);
492 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
493 level = (3 * qscale) >> 1;
494 if (GET_CACHE(re, &s->gb) & 0x40000000)
498 SKIP_BITS(re, &s->gb, 2);
499 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
503 /* now quantify & encode AC coefficients */
505 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
510 level = ((level * 2 + 1) * qscale) >> 1;
511 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
512 SHOW_SBITS(re, &s->gb, 1);
513 SKIP_BITS(re, &s->gb, 1);
516 run = SHOW_UBITS(re, &s->gb, 6) + 1;
517 LAST_SKIP_BITS(re, &s->gb, 6);
518 UPDATE_CACHE(re, &s->gb);
519 level = SHOW_SBITS(re, &s->gb, 12);
520 SKIP_BITS(re, &s->gb, 12);
525 level = ((-level * 2 + 1) * qscale) >> 1;
528 level = ((level * 2 + 1) * qscale) >> 1;
533 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
536 UPDATE_CACHE(re, &s->gb);
539 LAST_SKIP_BITS(re, &s->gb, 2);
540 CLOSE_READER(re, &s->gb);
541 s->block_last_index[n] = i;
545 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
546 int16_t *block, int n)
548 int level, dc, diff, i, j, run;
551 uint8_t *const scantable = s->intra_scantable.permutated;
552 const uint16_t *quant_matrix;
553 const int qscale = s->qscale;
558 quant_matrix = s->intra_matrix;
561 quant_matrix = s->chroma_intra_matrix;
562 component = (n & 1) + 1;
564 diff = decode_dc(&s->gb, component);
567 dc = s->last_dc[component];
569 s->last_dc[component] = dc;
570 block[0] = dc << (3 - s->intra_dc_precision);
571 av_dlog(s->avctx, "dc=%d\n", block[0]);
572 mismatch = block[0] ^ 1;
574 if (s->intra_vlc_format)
580 OPEN_READER(re, &s->gb);
581 /* now quantify & encode AC coefficients */
583 UPDATE_CACHE(re, &s->gb);
584 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
589 } else if (level != 0) {
591 check_scantable_index(s, i);
593 level = (level * qscale * quant_matrix[j]) >> 4;
594 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
595 SHOW_SBITS(re, &s->gb, 1);
596 LAST_SKIP_BITS(re, &s->gb, 1);
599 run = SHOW_UBITS(re, &s->gb, 6) + 1;
600 LAST_SKIP_BITS(re, &s->gb, 6);
601 UPDATE_CACHE(re, &s->gb);
602 level = SHOW_SBITS(re, &s->gb, 12);
603 SKIP_BITS(re, &s->gb, 12);
605 check_scantable_index(s, i);
608 level = (-level * qscale * quant_matrix[j]) >> 4;
611 level = (level * qscale * quant_matrix[j]) >> 4;
618 CLOSE_READER(re, &s->gb);
620 block[63] ^= mismatch & 1;
622 s->block_last_index[n] = i;
627 * Note: this function can read out of range and crash for corrupt streams.
628 * Changing this would eat up any speed benefits it has.
629 * Do not use "fast" flag if you need the code to be robust.
631 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
632 int16_t *block, int n)
634 int level, dc, diff, i, j, run;
637 uint8_t *const scantable = s->intra_scantable.permutated;
638 const uint16_t *quant_matrix;
639 const int qscale = s->qscale;
643 quant_matrix = s->intra_matrix;
646 quant_matrix = s->chroma_intra_matrix;
647 component = (n & 1) + 1;
649 diff = decode_dc(&s->gb, component);
652 dc = s->last_dc[component];
654 s->last_dc[component] = dc;
655 block[0] = dc << (3 - s->intra_dc_precision);
657 if (s->intra_vlc_format)
663 OPEN_READER(re, &s->gb);
664 /* now quantify & encode AC coefficients */
666 UPDATE_CACHE(re, &s->gb);
667 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
670 if (level >= 64 || i > 63) {
672 } else if (level != 0) {
675 level = (level * qscale * quant_matrix[j]) >> 4;
676 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
677 SHOW_SBITS(re, &s->gb, 1);
678 LAST_SKIP_BITS(re, &s->gb, 1);
681 run = SHOW_UBITS(re, &s->gb, 6) + 1;
682 LAST_SKIP_BITS(re, &s->gb, 6);
683 UPDATE_CACHE(re, &s->gb);
684 level = SHOW_SBITS(re, &s->gb, 12);
685 SKIP_BITS(re, &s->gb, 12);
689 level = (-level * qscale * quant_matrix[j]) >> 4;
692 level = (level * qscale * quant_matrix[j]) >> 4;
698 CLOSE_READER(re, &s->gb);
701 s->block_last_index[n] = i;
705 /******************************************/
708 static inline int get_dmv(MpegEncContext *s)
710 if (get_bits1(&s->gb))
711 return 1 - (get_bits1(&s->gb) << 1);
716 static inline int get_qscale(MpegEncContext *s)
718 int qscale = get_bits(&s->gb, 5);
720 return non_linear_qscale[qscale];
726 /* motion type (for MPEG-2) */
732 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
734 int i, j, k, cbp, val, mb_type, motion_type;
735 const int mb_block_count = 4 + (1 << s->chroma_format);
738 av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
740 av_assert2(s->mb_skipped == 0);
742 if (s->mb_skip_run-- != 0) {
743 if (s->pict_type == AV_PICTURE_TYPE_P) {
745 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
746 MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
751 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
753 // FIXME not sure if this is allowed in MPEG at all
754 mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
755 if (IS_INTRA(mb_type)) {
756 av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
757 return AVERROR_INVALIDDATA;
759 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
760 mb_type | MB_TYPE_SKIP;
762 if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
769 switch (s->pict_type) {
771 case AV_PICTURE_TYPE_I:
772 if (get_bits1(&s->gb) == 0) {
773 if (get_bits1(&s->gb) == 0) {
774 av_log(s->avctx, AV_LOG_ERROR,
775 "invalid mb type in I Frame at %d %d\n",
777 return AVERROR_INVALIDDATA;
779 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
781 mb_type = MB_TYPE_INTRA;
784 case AV_PICTURE_TYPE_P:
785 mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
787 av_log(s->avctx, AV_LOG_ERROR,
788 "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
789 return AVERROR_INVALIDDATA;
791 mb_type = ptype2mb_type[mb_type];
793 case AV_PICTURE_TYPE_B:
794 mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
796 av_log(s->avctx, AV_LOG_ERROR,
797 "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
798 return AVERROR_INVALIDDATA;
800 mb_type = btype2mb_type[mb_type];
803 av_dlog(s->avctx, "mb_type=%x\n", mb_type);
804 // motion_type = 0; /* avoid warning */
805 if (IS_INTRA(mb_type)) {
806 s->bdsp.clear_blocks(s->block[0]);
808 if (!s->chroma_y_shift)
809 s->bdsp.clear_blocks(s->block[6]);
811 /* compute DCT type */
812 // FIXME: add an interlaced_dct coded var?
813 if (s->picture_structure == PICT_FRAME &&
814 !s->frame_pred_frame_dct)
815 s->interlaced_dct = get_bits1(&s->gb);
817 if (IS_QUANT(mb_type))
818 s->qscale = get_qscale(s);
820 if (s->concealment_motion_vectors) {
821 /* just parse them */
822 if (s->picture_structure != PICT_FRAME)
823 skip_bits1(&s->gb); /* field select */
826 s->last_mv[0][0][0] =
827 s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
828 s->last_mv[0][0][0]);
830 s->last_mv[0][0][1] =
831 s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
832 s->last_mv[0][0][1]);
834 skip_bits1(&s->gb); /* marker */
836 /* reset mv prediction */
837 memset(s->last_mv, 0, sizeof(s->last_mv));
840 // if 1, we memcpy blocks in xvmcvideo
841 if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
842 ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
844 if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
845 if (s->flags2 & CODEC_FLAG2_FAST) {
846 for (i = 0; i < 6; i++)
847 mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
849 for (i = 0; i < mb_block_count; i++)
850 if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
854 for (i = 0; i < 6; i++)
855 if ((ret = mpeg1_decode_block_intra(s, *s->pblocks[i], i)) < 0)
859 if (mb_type & MB_TYPE_ZERO_MV) {
860 av_assert2(mb_type & MB_TYPE_CBP);
862 s->mv_dir = MV_DIR_FORWARD;
863 if (s->picture_structure == PICT_FRAME) {
864 if (s->picture_structure == PICT_FRAME
865 && !s->frame_pred_frame_dct)
866 s->interlaced_dct = get_bits1(&s->gb);
867 s->mv_type = MV_TYPE_16X16;
869 s->mv_type = MV_TYPE_FIELD;
870 mb_type |= MB_TYPE_INTERLACED;
871 s->field_select[0][0] = s->picture_structure - 1;
874 if (IS_QUANT(mb_type))
875 s->qscale = get_qscale(s);
877 s->last_mv[0][0][0] = 0;
878 s->last_mv[0][0][1] = 0;
879 s->last_mv[0][1][0] = 0;
880 s->last_mv[0][1][1] = 0;
884 av_assert2(mb_type & MB_TYPE_L0L1);
885 // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
886 /* get additional motion vector type */
887 if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
888 motion_type = MT_FRAME;
890 motion_type = get_bits(&s->gb, 2);
891 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
892 s->interlaced_dct = get_bits1(&s->gb);
895 if (IS_QUANT(mb_type))
896 s->qscale = get_qscale(s);
899 s->mv_dir = (mb_type >> 13) & 3;
900 av_dlog(s->avctx, "motion_type=%d\n", motion_type);
901 switch (motion_type) {
902 case MT_FRAME: /* or MT_16X8 */
903 if (s->picture_structure == PICT_FRAME) {
904 mb_type |= MB_TYPE_16x16;
905 s->mv_type = MV_TYPE_16X16;
906 for (i = 0; i < 2; i++) {
907 if (USES_LIST(mb_type, i)) {
910 s->last_mv[i][0][0] =
911 s->last_mv[i][1][0] =
912 mpeg_decode_motion(s, s->mpeg_f_code[i][0],
913 s->last_mv[i][0][0]);
915 s->last_mv[i][0][1] =
916 s->last_mv[i][1][1] =
917 mpeg_decode_motion(s, s->mpeg_f_code[i][1],
918 s->last_mv[i][0][1]);
919 /* full_pel: only for MPEG-1 */
920 if (s->full_pel[i]) {
921 s->mv[i][0][0] <<= 1;
922 s->mv[i][0][1] <<= 1;
927 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
928 s->mv_type = MV_TYPE_16X8;
929 for (i = 0; i < 2; i++) {
930 if (USES_LIST(mb_type, i)) {
932 for (j = 0; j < 2; j++) {
933 s->field_select[i][j] = get_bits1(&s->gb);
934 for (k = 0; k < 2; k++) {
935 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
936 s->last_mv[i][j][k]);
937 s->last_mv[i][j][k] = val;
938 s->mv[i][j][k] = val;
946 s->mv_type = MV_TYPE_FIELD;
947 if (s->picture_structure == PICT_FRAME) {
948 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
949 for (i = 0; i < 2; i++) {
950 if (USES_LIST(mb_type, i)) {
951 for (j = 0; j < 2; j++) {
952 s->field_select[i][j] = get_bits1(&s->gb);
953 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
954 s->last_mv[i][j][0]);
955 s->last_mv[i][j][0] = val;
956 s->mv[i][j][0] = val;
957 av_dlog(s->avctx, "fmx=%d\n", val);
958 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
959 s->last_mv[i][j][1] >> 1);
960 s->last_mv[i][j][1] = val << 1;
961 s->mv[i][j][1] = val;
962 av_dlog(s->avctx, "fmy=%d\n", val);
967 av_assert0(!s->progressive_sequence);
968 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
969 for (i = 0; i < 2; i++) {
970 if (USES_LIST(mb_type, i)) {
971 s->field_select[i][0] = get_bits1(&s->gb);
972 for (k = 0; k < 2; k++) {
973 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
974 s->last_mv[i][0][k]);
975 s->last_mv[i][0][k] = val;
976 s->last_mv[i][1][k] = val;
977 s->mv[i][0][k] = val;
984 if (s->progressive_sequence){
985 av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
986 return AVERROR_INVALIDDATA;
988 s->mv_type = MV_TYPE_DMV;
989 for (i = 0; i < 2; i++) {
990 if (USES_LIST(mb_type, i)) {
991 int dmx, dmy, mx, my, m;
992 const int my_shift = s->picture_structure == PICT_FRAME;
994 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
995 s->last_mv[i][0][0]);
996 s->last_mv[i][0][0] = mx;
997 s->last_mv[i][1][0] = mx;
999 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1000 s->last_mv[i][0][1] >> my_shift);
1004 s->last_mv[i][0][1] = my << my_shift;
1005 s->last_mv[i][1][1] = my << my_shift;
1007 s->mv[i][0][0] = mx;
1008 s->mv[i][0][1] = my;
1009 s->mv[i][1][0] = mx; // not used
1010 s->mv[i][1][1] = my; // not used
1012 if (s->picture_structure == PICT_FRAME) {
1013 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1015 // m = 1 + 2 * s->top_field_first;
1016 m = s->top_field_first ? 1 : 3;
1018 /* top -> top pred */
1019 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1020 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1022 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1023 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1025 mb_type |= MB_TYPE_16x16;
1027 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1028 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1029 if (s->picture_structure == PICT_TOP_FIELD)
1038 av_log(s->avctx, AV_LOG_ERROR,
1039 "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1040 return AVERROR_INVALIDDATA;
1045 if (HAS_CBP(mb_type)) {
1046 s->bdsp.clear_blocks(s->block[0]);
1048 cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1049 if (mb_block_count > 6) {
1050 cbp <<= mb_block_count - 6;
1051 cbp |= get_bits(&s->gb, mb_block_count - 6);
1052 s->bdsp.clear_blocks(s->block[6]);
1055 av_log(s->avctx, AV_LOG_ERROR,
1056 "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
1057 return AVERROR_INVALIDDATA;
1060 // if 1, we memcpy blocks in xvmcvideo
1061 if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1062 ff_xvmc_pack_pblocks(s, cbp);
1064 if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1065 if (s->flags2 & CODEC_FLAG2_FAST) {
1066 for (i = 0; i < 6; i++) {
1068 mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1070 s->block_last_index[i] = -1;
1074 cbp <<= 12 - mb_block_count;
1076 for (i = 0; i < mb_block_count; i++) {
1077 if (cbp & (1 << 11)) {
1078 if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1081 s->block_last_index[i] = -1;
1087 if (s->flags2 & CODEC_FLAG2_FAST) {
1088 for (i = 0; i < 6; i++) {
1090 mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1092 s->block_last_index[i] = -1;
1096 for (i = 0; i < 6; i++) {
1098 if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1101 s->block_last_index[i] = -1;
1108 for (i = 0; i < 12; i++)
1109 s->block_last_index[i] = -1;
1113 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1118 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1120 Mpeg1Context *s = avctx->priv_data;
1121 MpegEncContext *s2 = &s->mpeg_enc_ctx;
1123 ff_mpv_decode_defaults(s2);
1125 if ( avctx->codec_tag != AV_RL32("VCR2")
1126 && avctx->codec_tag != AV_RL32("BW10"))
1127 avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1128 ff_mpv_decode_init(s2, avctx);
1130 s->mpeg_enc_ctx.avctx = avctx;
1132 /* we need some permutation to store matrices,
1133 * until the decoder sets the real permutation. */
1134 ff_mpv_idct_init(s2);
1135 ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1136 ff_mpeg12_init_vlcs();
1138 s->mpeg_enc_ctx_allocated = 0;
1139 s->mpeg_enc_ctx.picture_number = 0;
1140 s->repeat_field = 0;
1141 s->mpeg_enc_ctx.codec_id = avctx->codec->id;
1142 avctx->color_range = AVCOL_RANGE_MPEG;
1143 if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1144 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1146 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1150 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1151 const AVCodecContext *avctx_from)
1153 Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1154 MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1157 if (avctx == avctx_from ||
1158 !ctx_from->mpeg_enc_ctx_allocated ||
1159 !s1->context_initialized)
1162 err = ff_mpeg_update_thread_context(avctx, avctx_from);
1166 if (!ctx->mpeg_enc_ctx_allocated)
1167 memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1169 if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1170 s->picture_number++;
1175 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1176 const uint8_t *new_perm)
1178 uint16_t temp_matrix[64];
1181 memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1183 for (i = 0; i < 64; i++)
1184 matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1187 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1188 #if CONFIG_MPEG1_XVMC_HWACCEL
1191 #if CONFIG_MPEG1_VDPAU_HWACCEL
1192 AV_PIX_FMT_VDPAU_MPEG1,
1199 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1200 #if CONFIG_MPEG2_XVMC_HWACCEL
1203 #if CONFIG_MPEG2_VDPAU_HWACCEL
1204 AV_PIX_FMT_VDPAU_MPEG2,
1207 #if CONFIG_MPEG2_DXVA2_HWACCEL
1208 AV_PIX_FMT_DXVA2_VLD,
1210 #if CONFIG_MPEG2_VAAPI_HWACCEL
1211 AV_PIX_FMT_VAAPI_VLD,
1217 static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1222 static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1227 static inline int uses_vdpau(AVCodecContext *avctx) {
1228 return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1231 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1233 Mpeg1Context *s1 = avctx->priv_data;
1234 MpegEncContext *s = &s1->mpeg_enc_ctx;
1235 const enum AVPixelFormat *pix_fmts;
1237 if (s->chroma_format < 2)
1238 pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1239 mpeg1_hwaccel_pixfmt_list_420 :
1240 mpeg2_hwaccel_pixfmt_list_420;
1241 else if (s->chroma_format == 2)
1242 pix_fmts = mpeg12_pixfmt_list_422;
1244 pix_fmts = mpeg12_pixfmt_list_444;
1246 return ff_thread_get_format(avctx, pix_fmts);
1249 static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1251 // until then pix_fmt may be changed right after codec init
1252 if (avctx->hwaccel || uses_vdpau(avctx))
1253 if (avctx->idct_algo == FF_IDCT_AUTO)
1254 avctx->idct_algo = FF_IDCT_SIMPLE;
1256 if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1257 Mpeg1Context *s1 = avctx->priv_data;
1258 MpegEncContext *s = &s1->mpeg_enc_ctx;
1260 s->pack_pblocks = 1;
1262 avctx->xvmc_acceleration = 2;
1263 #endif /* FF_API_XVMC */
1267 /* Call this function when we know all parameters.
1268 * It may be called in different places for MPEG-1 and MPEG-2. */
1269 static int mpeg_decode_postinit(AVCodecContext *avctx)
1271 Mpeg1Context *s1 = avctx->priv_data;
1272 MpegEncContext *s = &s1->mpeg_enc_ctx;
1273 uint8_t old_permutation[64];
1276 if ((s1->mpeg_enc_ctx_allocated == 0) ||
1277 avctx->coded_width != s->width ||
1278 avctx->coded_height != s->height ||
1279 s1->save_width != s->width ||
1280 s1->save_height != s->height ||
1281 s1->save_aspect_info != s->aspect_ratio_info ||
1282 (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1284 if (s1->mpeg_enc_ctx_allocated) {
1285 ParseContext pc = s->parse_context;
1286 s->parse_context.buffer = 0;
1287 ff_mpv_common_end(s);
1288 s->parse_context = pc;
1289 s1->mpeg_enc_ctx_allocated = 0;
1292 if ((s->width == 0) || (s->height == 0))
1295 ret = ff_set_dimensions(avctx, s->width, s->height);
1299 if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1300 avctx->rc_max_rate = s->bit_rate;
1301 } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1302 (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1303 avctx->bit_rate = s->bit_rate;
1305 s1->save_aspect_info = s->aspect_ratio_info;
1306 s1->save_width = s->width;
1307 s1->save_height = s->height;
1308 s1->save_progressive_seq = s->progressive_sequence;
1310 /* low_delay may be forced, in this case we will have B-frames
1311 * that behave like P-frames. */
1312 avctx->has_b_frames = !s->low_delay;
1314 if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1316 avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1318 avctx->sample_aspect_ratio = av_d2q(1.0 / ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1319 avctx->ticks_per_frame = 1;
1322 av_reduce(&s->avctx->framerate.num,
1323 &s->avctx->framerate.den,
1324 ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1325 ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1327 avctx->ticks_per_frame = 2;
1329 if (s->aspect_ratio_info > 1) {
1331 av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1332 (AVRational) { s1->pan_scan.width,
1333 s1->pan_scan.height }),
1334 (AVRational) { s->width, s->height });
1336 /* We ignore the spec here and guess a bit as reality does not
1337 * match the spec, see for example res_change_ffmpeg_aspect.ts
1338 * and sequence-display-aspect.mpg.
1339 * issue1613, 621, 562 */
1340 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1341 (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1342 av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1343 s->avctx->sample_aspect_ratio =
1344 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1345 (AVRational) { s->width, s->height });
1347 s->avctx->sample_aspect_ratio =
1348 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1349 (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1350 // issue1613 4/3 16/9 -> 16/9
1351 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1352 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1353 // s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1354 av_dlog(avctx, "A %d/%d\n",
1355 ff_mpeg2_aspect[s->aspect_ratio_info].num,
1356 ff_mpeg2_aspect[s->aspect_ratio_info].den);
1357 av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1358 s->avctx->sample_aspect_ratio.den);
1361 s->avctx->sample_aspect_ratio =
1362 ff_mpeg2_aspect[s->aspect_ratio_info];
1366 ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
1368 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1369 setup_hwaccel_for_pixfmt(avctx);
1371 /* Quantization matrices may need reordering
1372 * if DCT permutation is changed. */
1373 memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1375 ff_mpv_idct_init(s);
1376 if (ff_mpv_common_init(s) < 0)
1379 quant_matrix_rebuild(s->intra_matrix, old_permutation, s->idsp.idct_permutation);
1380 quant_matrix_rebuild(s->inter_matrix, old_permutation, s->idsp.idct_permutation);
1381 quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1382 quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1384 s1->mpeg_enc_ctx_allocated = 1;
1389 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1392 Mpeg1Context *s1 = avctx->priv_data;
1393 MpegEncContext *s = &s1->mpeg_enc_ctx;
1394 int ref, f_code, vbv_delay;
1396 init_get_bits(&s->gb, buf, buf_size * 8);
1398 ref = get_bits(&s->gb, 10); /* temporal ref */
1399 s->pict_type = get_bits(&s->gb, 3);
1400 if (s->pict_type == 0 || s->pict_type > 3)
1401 return AVERROR_INVALIDDATA;
1403 vbv_delay = get_bits(&s->gb, 16);
1404 s->vbv_delay = vbv_delay;
1405 if (s->pict_type == AV_PICTURE_TYPE_P ||
1406 s->pict_type == AV_PICTURE_TYPE_B) {
1407 s->full_pel[0] = get_bits1(&s->gb);
1408 f_code = get_bits(&s->gb, 3);
1409 if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1410 return AVERROR_INVALIDDATA;
1412 s->mpeg_f_code[0][0] = f_code;
1413 s->mpeg_f_code[0][1] = f_code;
1415 if (s->pict_type == AV_PICTURE_TYPE_B) {
1416 s->full_pel[1] = get_bits1(&s->gb);
1417 f_code = get_bits(&s->gb, 3);
1418 if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1419 return AVERROR_INVALIDDATA;
1421 s->mpeg_f_code[1][0] = f_code;
1422 s->mpeg_f_code[1][1] = f_code;
1424 s->current_picture.f->pict_type = s->pict_type;
1425 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1427 if (avctx->debug & FF_DEBUG_PICT_INFO)
1428 av_log(avctx, AV_LOG_DEBUG,
1429 "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1436 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1438 MpegEncContext *s = &s1->mpeg_enc_ctx;
1439 int horiz_size_ext, vert_size_ext;
1442 skip_bits(&s->gb, 1); /* profile and level esc*/
1443 s->avctx->profile = get_bits(&s->gb, 3);
1444 s->avctx->level = get_bits(&s->gb, 4);
1445 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1446 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1447 horiz_size_ext = get_bits(&s->gb, 2);
1448 vert_size_ext = get_bits(&s->gb, 2);
1449 s->width |= (horiz_size_ext << 12);
1450 s->height |= (vert_size_ext << 12);
1451 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1452 s->bit_rate += (bit_rate_ext << 18) * 400;
1453 skip_bits1(&s->gb); /* marker */
1454 s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1456 s->low_delay = get_bits1(&s->gb);
1457 if (s->flags & CODEC_FLAG_LOW_DELAY)
1460 s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1461 s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1463 av_dlog(s->avctx, "sequence extension\n");
1464 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1466 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1467 av_log(s->avctx, AV_LOG_DEBUG,
1468 "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%d\n",
1469 s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1470 s->avctx->rc_buffer_size, s->bit_rate);
1473 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1475 MpegEncContext *s = &s1->mpeg_enc_ctx;
1476 int color_description, w, h;
1478 skip_bits(&s->gb, 3); /* video format */
1479 color_description = get_bits1(&s->gb);
1480 if (color_description) {
1481 s->avctx->color_primaries = get_bits(&s->gb, 8);
1482 s->avctx->color_trc = get_bits(&s->gb, 8);
1483 s->avctx->colorspace = get_bits(&s->gb, 8);
1485 w = get_bits(&s->gb, 14);
1486 skip_bits(&s->gb, 1); // marker
1487 h = get_bits(&s->gb, 14);
1488 // remaining 3 bits are zero padding
1490 s1->pan_scan.width = 16 * w;
1491 s1->pan_scan.height = 16 * h;
1493 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1494 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1497 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1499 MpegEncContext *s = &s1->mpeg_enc_ctx;
1503 if (s->progressive_sequence) {
1504 if (s->repeat_first_field) {
1506 if (s->top_field_first)
1510 if (s->picture_structure == PICT_FRAME) {
1512 if (s->repeat_first_field)
1516 for (i = 0; i < nofco; i++) {
1517 s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1518 skip_bits(&s->gb, 1); // marker
1519 s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1520 skip_bits(&s->gb, 1); // marker
1523 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1524 av_log(s->avctx, AV_LOG_DEBUG,
1525 "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1526 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1527 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1528 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1531 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1532 uint16_t matrix1[64], int intra)
1536 for (i = 0; i < 64; i++) {
1537 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1538 int v = get_bits(&s->gb, 8);
1540 av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1541 return AVERROR_INVALIDDATA;
1543 if (intra && i == 0 && v != 8) {
1544 av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1545 v = 8; // needed by pink.mpg / issue1046
1554 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1556 av_dlog(s->avctx, "matrix extension\n");
1558 if (get_bits1(&s->gb))
1559 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1560 if (get_bits1(&s->gb))
1561 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1562 if (get_bits1(&s->gb))
1563 load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1564 if (get_bits1(&s->gb))
1565 load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1568 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1570 MpegEncContext *s = &s1->mpeg_enc_ctx;
1572 s->full_pel[0] = s->full_pel[1] = 0;
1573 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1574 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1575 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1576 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1577 if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1578 av_log(s->avctx, AV_LOG_ERROR,
1579 "Missing picture start code, guessing missing values\n");
1580 if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1581 if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1582 s->pict_type = AV_PICTURE_TYPE_I;
1584 s->pict_type = AV_PICTURE_TYPE_P;
1586 s->pict_type = AV_PICTURE_TYPE_B;
1587 s->current_picture.f->pict_type = s->pict_type;
1588 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1590 s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1591 s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1592 s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1593 s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1595 s->intra_dc_precision = get_bits(&s->gb, 2);
1596 s->picture_structure = get_bits(&s->gb, 2);
1597 s->top_field_first = get_bits1(&s->gb);
1598 s->frame_pred_frame_dct = get_bits1(&s->gb);
1599 s->concealment_motion_vectors = get_bits1(&s->gb);
1600 s->q_scale_type = get_bits1(&s->gb);
1601 s->intra_vlc_format = get_bits1(&s->gb);
1602 s->alternate_scan = get_bits1(&s->gb);
1603 s->repeat_first_field = get_bits1(&s->gb);
1604 s->chroma_420_type = get_bits1(&s->gb);
1605 s->progressive_frame = get_bits1(&s->gb);
1607 if (s->alternate_scan) {
1608 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1609 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1611 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1612 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1615 /* composite display not parsed */
1616 av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1617 av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1618 av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1619 av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1620 av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1621 av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1622 av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1623 av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1624 av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1627 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1629 AVCodecContext *avctx = s->avctx;
1630 Mpeg1Context *s1 = (Mpeg1Context *) s;
1633 /* start frame decoding */
1634 if (s->first_field || s->picture_structure == PICT_FRAME) {
1635 AVFrameSideData *pan_scan;
1637 if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1640 ff_mpeg_er_frame_start(s);
1642 /* first check if we must repeat the frame */
1643 s->current_picture_ptr->f->repeat_pict = 0;
1644 if (s->repeat_first_field) {
1645 if (s->progressive_sequence) {
1646 if (s->top_field_first)
1647 s->current_picture_ptr->f->repeat_pict = 4;
1649 s->current_picture_ptr->f->repeat_pict = 2;
1650 } else if (s->progressive_frame) {
1651 s->current_picture_ptr->f->repeat_pict = 1;
1655 pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1656 AV_FRAME_DATA_PANSCAN,
1657 sizeof(s1->pan_scan));
1659 return AVERROR(ENOMEM);
1660 memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1662 if (s1->a53_caption) {
1663 AVFrameSideData *sd = av_frame_new_side_data(
1664 s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1665 s1->a53_caption_size);
1667 memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1668 av_freep(&s1->a53_caption);
1671 if (s1->has_stereo3d) {
1672 AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1674 return AVERROR(ENOMEM);
1676 *stereo = s1->stereo3d;
1677 s1->has_stereo3d = 0;
1681 AVFrameSideData *sd =
1682 av_frame_new_side_data(s->current_picture_ptr->f,
1683 AV_FRAME_DATA_AFD, 1);
1685 return AVERROR(ENOMEM);
1687 *sd->data = s1->afd;
1691 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1692 ff_thread_finish_setup(avctx);
1693 } else { // second field
1696 if (!s->current_picture_ptr) {
1697 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1701 if (s->avctx->hwaccel &&
1702 (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1703 if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1704 av_log(avctx, AV_LOG_ERROR,
1705 "hardware accelerator failed to decode first field\n");
1708 for (i = 0; i < 4; i++) {
1709 s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1710 if (s->picture_structure == PICT_BOTTOM_FIELD)
1711 s->current_picture.f->data[i] +=
1712 s->current_picture_ptr->f->linesize[i];
1716 if (avctx->hwaccel) {
1717 if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1724 #define DECODE_SLICE_ERROR -1
1725 #define DECODE_SLICE_OK 0
1729 * MpegEncContext.mb_y must be set to the MB row from the startcode.
1730 * @return DECODE_SLICE_ERROR if the slice is damaged,
1731 * DECODE_SLICE_OK if this slice is OK
1733 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1734 const uint8_t **buf, int buf_size)
1736 AVCodecContext *avctx = s->avctx;
1737 const int lowres = s->avctx->lowres;
1738 const int field_pic = s->picture_structure != PICT_FRAME;
1742 s->resync_mb_y = -1;
1744 av_assert0(mb_y < s->mb_height);
1746 init_get_bits(&s->gb, *buf, buf_size * 8);
1747 if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1748 skip_bits(&s->gb, 3);
1750 ff_mpeg1_clean_buffers(s);
1751 s->interlaced_dct = 0;
1753 s->qscale = get_qscale(s);
1755 if (s->qscale == 0) {
1756 av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1757 return AVERROR_INVALIDDATA;
1760 /* extra slice info */
1761 if (skip_1stop_8data_bits(&s->gb) < 0)
1762 return AVERROR_INVALIDDATA;
1766 if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1769 while (get_bits_left(&s->gb) > 0) {
1770 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1771 MBINCR_VLC_BITS, 2);
1773 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1774 return AVERROR_INVALIDDATA;
1779 /* otherwise, stuffing, nothing to do */
1787 if (s->mb_x >= (unsigned) s->mb_width) {
1788 av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1789 return AVERROR_INVALIDDATA;
1792 if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1793 const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1794 int start_code = -1;
1795 buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1796 if (buf_end < *buf + buf_size)
1799 if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1800 return DECODE_SLICE_ERROR;
1802 return DECODE_SLICE_OK;
1805 s->resync_mb_x = s->mb_x;
1806 s->resync_mb_y = s->mb_y = mb_y;
1808 ff_init_block_index(s);
1810 if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1811 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1812 av_log(s->avctx, AV_LOG_DEBUG,
1813 "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",
1815 s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1816 s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1817 s->pict_type == AV_PICTURE_TYPE_I ? "I" :
1818 (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1819 (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1820 s->progressive_sequence ? "ps" : "",
1821 s->progressive_frame ? "pf" : "",
1822 s->alternate_scan ? "alt" : "",
1823 s->top_field_first ? "top" : "",
1824 s->intra_dc_precision, s->picture_structure,
1825 s->frame_pred_frame_dct, s->concealment_motion_vectors,
1826 s->q_scale_type, s->intra_vlc_format,
1827 s->repeat_first_field, s->chroma_420_type ? "420" : "");
1832 // If 1, we memcpy blocks in xvmcvideo.
1833 if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1834 ff_xvmc_init_block(s); // set s->block
1836 if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1839 // Note motion_val is normally NULL unless we want to extract the MVs.
1840 if (s->current_picture.motion_val[0] && !s->encoding) {
1841 const int wrap = s->b8_stride;
1842 int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1843 int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1844 int motion_x, motion_y, dir, i;
1846 for (i = 0; i < 2; i++) {
1847 for (dir = 0; dir < 2; dir++) {
1849 (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1850 motion_x = motion_y = 0;
1851 } else if (s->mv_type == MV_TYPE_16X16 ||
1852 (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1853 motion_x = s->mv[dir][0][0];
1854 motion_y = s->mv[dir][0][1];
1855 } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1856 motion_x = s->mv[dir][i][0];
1857 motion_y = s->mv[dir][i][1];
1860 s->current_picture.motion_val[dir][xy][0] = motion_x;
1861 s->current_picture.motion_val[dir][xy][1] = motion_y;
1862 s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1863 s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1864 s->current_picture.ref_index [dir][b8_xy] =
1865 s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1866 av_assert2(s->field_select[dir][i] == 0 ||
1867 s->field_select[dir][i] == 1);
1874 s->dest[0] += 16 >> lowres;
1875 s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1876 s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1878 ff_mpv_decode_mb(s, s->block);
1880 if (++s->mb_x >= s->mb_width) {
1881 const int mb_size = 16 >> s->avctx->lowres;
1883 ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1884 ff_mpv_report_decode_progress(s);
1887 s->mb_y += 1 << field_pic;
1889 if (s->mb_y >= s->mb_height) {
1890 int left = get_bits_left(&s->gb);
1891 int is_d10 = s->chroma_format == 2 &&
1892 s->pict_type == AV_PICTURE_TYPE_I &&
1893 avctx->profile == 0 && avctx->level == 5 &&
1894 s->intra_dc_precision == 2 &&
1895 s->q_scale_type == 1 && s->alternate_scan == 0 &&
1896 s->progressive_frame == 0
1897 /* vbv_delay == 0xBBB || 0xE10 */;
1899 if (left >= 32 && !is_d10) {
1900 GetBitContext gb = s->gb;
1901 align_get_bits(&gb);
1902 if (show_bits(&gb, 24) == 0x060E2B) {
1903 av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1909 (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1910 ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1911 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
1912 left, show_bits(&s->gb, FFMIN(left, 23)));
1917 // There are some files out there which are missing the last slice
1918 // in cases where the slice is completely outside the visible
1919 // area, we detect this here instead of running into the end expecting
1921 if (s->mb_y >= ((s->height + 15) >> 4) &&
1922 s->progressive_frame &&
1923 !s->progressive_sequence &&
1924 get_bits_left(&s->gb) <= 8 &&
1925 get_bits_left(&s->gb) >= 0 &&
1926 s->mb_skip_run == -1 &&
1927 show_bits(&s->gb, 8) == 0)
1930 ff_init_block_index(s);
1933 /* skip mb handling */
1934 if (s->mb_skip_run == -1) {
1935 /* read increment again */
1938 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1939 MBINCR_VLC_BITS, 2);
1941 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1942 return AVERROR_INVALIDDATA;
1946 s->mb_skip_run += 33;
1947 } else if (code == 35) {
1948 if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1949 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1952 goto eos; /* end of slice */
1954 /* otherwise, stuffing, nothing to do */
1956 s->mb_skip_run += code;
1960 if (s->mb_skip_run) {
1962 if (s->pict_type == AV_PICTURE_TYPE_I) {
1963 av_log(s->avctx, AV_LOG_ERROR,
1964 "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1965 return AVERROR_INVALIDDATA;
1970 for (i = 0; i < 12; i++)
1971 s->block_last_index[i] = -1;
1972 if (s->picture_structure == PICT_FRAME)
1973 s->mv_type = MV_TYPE_16X16;
1975 s->mv_type = MV_TYPE_FIELD;
1976 if (s->pict_type == AV_PICTURE_TYPE_P) {
1977 /* if P type, zero motion vector is implied */
1978 s->mv_dir = MV_DIR_FORWARD;
1979 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1980 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1981 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1982 s->field_select[0][0] = (s->picture_structure - 1) & 1;
1984 /* if B type, reuse previous vectors and directions */
1985 s->mv[0][0][0] = s->last_mv[0][0][0];
1986 s->mv[0][0][1] = s->last_mv[0][0][1];
1987 s->mv[1][0][0] = s->last_mv[1][0][0];
1988 s->mv[1][0][1] = s->last_mv[1][0][1];
1993 eos: // end of slice
1994 if (get_bits_left(&s->gb) < 0) {
1995 av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1996 return AVERROR_INVALIDDATA;
1998 *buf += (get_bits_count(&s->gb) - 1) / 8;
1999 av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2003 static int slice_decode_thread(AVCodecContext *c, void *arg)
2005 MpegEncContext *s = *(void **) arg;
2006 const uint8_t *buf = s->gb.buffer;
2007 int mb_y = s->start_mb_y;
2008 const int field_pic = s->picture_structure != PICT_FRAME;
2010 s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
2013 uint32_t start_code;
2016 ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
2018 av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2019 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
2020 s->start_mb_y, s->end_mb_y, s->er.error_count);
2022 if (c->err_recognition & AV_EF_EXPLODE)
2024 if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2025 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2027 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2029 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2030 s->mb_x - 1, s->mb_y,
2031 ER_AC_END | ER_DC_END | ER_MV_END);
2034 if (s->mb_y == s->end_mb_y)
2038 buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2039 mb_y = start_code - SLICE_MIN_START_CODE;
2040 if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2041 mb_y += (*buf&0xE0)<<2;
2043 if (s->picture_structure == PICT_BOTTOM_FIELD)
2045 if (mb_y < 0 || mb_y >= s->end_mb_y)
2051 * Handle slice ends.
2052 * @return 1 if it seems to be the last slice
2054 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2056 Mpeg1Context *s1 = avctx->priv_data;
2057 MpegEncContext *s = &s1->mpeg_enc_ctx;
2059 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2062 if (s->avctx->hwaccel) {
2063 if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
2064 av_log(avctx, AV_LOG_ERROR,
2065 "hardware accelerator failed to decode picture\n");
2068 /* end of slice reached */
2069 if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2072 ff_er_frame_end(&s->er);
2074 ff_mpv_frame_end(s);
2076 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2077 int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2080 ff_print_debug_info(s, s->current_picture_ptr, pict);
2081 ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2083 if (avctx->active_thread_type & FF_THREAD_FRAME)
2084 s->picture_number++;
2085 /* latency of 1 frame for I- and P-frames */
2086 /* XXX: use another variable than picture_number */
2087 if (s->last_picture_ptr) {
2088 int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2091 ff_print_debug_info(s, s->last_picture_ptr, pict);
2092 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2102 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2103 const uint8_t *buf, int buf_size)
2105 Mpeg1Context *s1 = avctx->priv_data;
2106 MpegEncContext *s = &s1->mpeg_enc_ctx;
2110 init_get_bits(&s->gb, buf, buf_size * 8);
2112 width = get_bits(&s->gb, 12);
2113 height = get_bits(&s->gb, 12);
2114 if (width == 0 || height == 0) {
2115 av_log(avctx, AV_LOG_WARNING,
2116 "Invalid horizontal or vertical size value.\n");
2117 if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2118 return AVERROR_INVALIDDATA;
2120 s->aspect_ratio_info = get_bits(&s->gb, 4);
2121 if (s->aspect_ratio_info == 0) {
2122 av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2123 if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2124 return AVERROR_INVALIDDATA;
2126 s->frame_rate_index = get_bits(&s->gb, 4);
2127 if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2128 av_log(avctx, AV_LOG_WARNING, "frame_rate_index %d is invalid\n", s->frame_rate_index);
2129 s->frame_rate_index = 1;
2131 s->bit_rate = get_bits(&s->gb, 18) * 400;
2132 if (get_bits1(&s->gb) == 0) { /* marker */
2133 av_log(avctx, AV_LOG_ERROR, "Marker in sequence header missing\n");
2134 return AVERROR_INVALIDDATA;
2139 s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2140 skip_bits(&s->gb, 1);
2143 if (get_bits1(&s->gb)) {
2144 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2146 for (i = 0; i < 64; i++) {
2147 j = s->idsp.idct_permutation[i];
2148 v = ff_mpeg1_default_intra_matrix[i];
2149 s->intra_matrix[j] = v;
2150 s->chroma_intra_matrix[j] = v;
2153 if (get_bits1(&s->gb)) {
2154 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2156 for (i = 0; i < 64; i++) {
2157 int j = s->idsp.idct_permutation[i];
2158 v = ff_mpeg1_default_non_intra_matrix[i];
2159 s->inter_matrix[j] = v;
2160 s->chroma_inter_matrix[j] = v;
2164 if (show_bits(&s->gb, 23) != 0) {
2165 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2166 return AVERROR_INVALIDDATA;
2169 /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2170 s->progressive_sequence = 1;
2171 s->progressive_frame = 1;
2172 s->picture_structure = PICT_FRAME;
2174 s->frame_pred_frame_dct = 1;
2175 s->chroma_format = 1;
2177 s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2178 s->out_format = FMT_MPEG1;
2179 s->swap_uv = 0; // AFAIK VCR2 does not have SEQ_HEADER
2180 if (s->flags & CODEC_FLAG_LOW_DELAY)
2183 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2184 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d, aspect_ratio_info: %d \n",
2185 s->avctx->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2190 static int vcr2_init_sequence(AVCodecContext *avctx)
2192 Mpeg1Context *s1 = avctx->priv_data;
2193 MpegEncContext *s = &s1->mpeg_enc_ctx;
2197 /* start new MPEG-1 context decoding */
2198 s->out_format = FMT_MPEG1;
2199 if (s1->mpeg_enc_ctx_allocated) {
2200 ff_mpv_common_end(s);
2201 s1->mpeg_enc_ctx_allocated = 0;
2203 s->width = avctx->coded_width;
2204 s->height = avctx->coded_height;
2205 avctx->has_b_frames = 0; // true?
2208 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2209 setup_hwaccel_for_pixfmt(avctx);
2211 ff_mpv_idct_init(s);
2212 if ((ret = ff_mpv_common_init(s)) < 0)
2214 s1->mpeg_enc_ctx_allocated = 1;
2216 for (i = 0; i < 64; i++) {
2217 int j = s->idsp.idct_permutation[i];
2218 v = ff_mpeg1_default_intra_matrix[i];
2219 s->intra_matrix[j] = v;
2220 s->chroma_intra_matrix[j] = v;
2222 v = ff_mpeg1_default_non_intra_matrix[i];
2223 s->inter_matrix[j] = v;
2224 s->chroma_inter_matrix[j] = v;
2227 s->progressive_sequence = 1;
2228 s->progressive_frame = 1;
2229 s->picture_structure = PICT_FRAME;
2231 s->frame_pred_frame_dct = 1;
2232 s->chroma_format = 1;
2233 if (s->codec_tag == AV_RL32("BW10")) {
2234 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2236 s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2237 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2239 s1->save_width = s->width;
2240 s1->save_height = s->height;
2241 s1->save_progressive_seq = s->progressive_sequence;
2245 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2246 const uint8_t *p, int buf_size)
2248 Mpeg1Context *s1 = avctx->priv_data;
2250 if (buf_size >= 6 &&
2251 p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2252 p[4] == 3 && (p[5] & 0x40)) {
2253 /* extract A53 Part 4 CC data */
2254 int cc_count = p[5] & 0x1f;
2255 if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2256 av_freep(&s1->a53_caption);
2257 s1->a53_caption_size = cc_count * 3;
2258 s1->a53_caption = av_malloc(s1->a53_caption_size);
2259 if (s1->a53_caption)
2260 memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2263 } else if (buf_size >= 11 &&
2264 p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2265 /* extract DVD CC data */
2268 // There is a caption count field in the data, but it is often
2269 // incorect. So count the number of captions present.
2270 for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2272 // Transform the DVD format into A53 Part 4 format
2274 av_freep(&s1->a53_caption);
2275 s1->a53_caption_size = cc_count * 6;
2276 s1->a53_caption = av_malloc(s1->a53_caption_size);
2277 if (s1->a53_caption) {
2278 uint8_t field1 = !!(p[4] & 0x80);
2279 uint8_t *cap = s1->a53_caption;
2281 for (i = 0; i < cc_count; i++) {
2282 cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2285 cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2298 static void mpeg_decode_user_data(AVCodecContext *avctx,
2299 const uint8_t *p, int buf_size)
2301 Mpeg1Context *s = avctx->priv_data;
2302 const uint8_t *buf_end = p + buf_size;
2303 Mpeg1Context *s1 = avctx->priv_data;
2308 if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2312 /* for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2313 av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2315 av_log(avctx, AV_LOG_ERROR, "\n");*/
2318 /* we parse the DTG active format information */
2319 if (buf_end - p >= 5 &&
2320 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2328 if (buf_end - p < 1)
2331 FF_DISABLE_DEPRECATION_WARNINGS
2332 avctx->dtg_active_format = p[0] & 0x0f;
2333 FF_ENABLE_DEPRECATION_WARNINGS
2334 #endif /* FF_API_AFD */
2336 s1->afd = p[0] & 0x0f;
2338 } else if (buf_end - p >= 6 &&
2339 p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2340 p[4] == 0x03) { // S3D_video_format_length
2341 // the 0x7F mask ignores the reserved_bit value
2342 const uint8_t S3D_video_format_type = p[5] & 0x7F;
2344 if (S3D_video_format_type == 0x03 ||
2345 S3D_video_format_type == 0x04 ||
2346 S3D_video_format_type == 0x08 ||
2347 S3D_video_format_type == 0x23) {
2349 s1->has_stereo3d = 1;
2351 switch (S3D_video_format_type) {
2353 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2356 s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2359 s1->stereo3d.type = AV_STEREO3D_2D;
2362 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2366 } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2371 static void mpeg_decode_gop(AVCodecContext *avctx,
2372 const uint8_t *buf, int buf_size)
2374 Mpeg1Context *s1 = avctx->priv_data;
2375 MpegEncContext *s = &s1->mpeg_enc_ctx;
2379 init_get_bits(&s->gb, buf, buf_size * 8);
2381 tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2383 s->closed_gop = get_bits1(&s->gb);
2384 /* broken_link indicate that after editing the
2385 * reference frames of the first B-Frames after GOP I-Frame
2386 * are missing (open gop) */
2387 broken_link = get_bits1(&s->gb);
2389 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2390 char tcbuf[AV_TIMECODE_STR_SIZE];
2391 av_timecode_make_mpeg_tc_string(tcbuf, tc);
2392 av_log(s->avctx, AV_LOG_DEBUG,
2393 "GOP (%s) closed_gop=%d broken_link=%d\n",
2394 tcbuf, s->closed_gop, broken_link);
2398 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2399 int *got_output, const uint8_t *buf, int buf_size)
2401 Mpeg1Context *s = avctx->priv_data;
2402 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2403 const uint8_t *buf_ptr = buf;
2404 const uint8_t *buf_end = buf + buf_size;
2405 int ret, input_size;
2406 int last_code = 0, skip_frame = 0;
2407 int picture_start_code_seen = 0;
2410 /* find next start code */
2411 uint32_t start_code = -1;
2412 buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2413 if (start_code > 0x1ff) {
2416 (avctx->active_thread_type & FF_THREAD_SLICE) &&
2419 av_assert0(avctx->thread_count > 1);
2421 avctx->execute(avctx, slice_decode_thread,
2422 &s2->thread_context[0], NULL,
2423 s->slice_count, sizeof(void *));
2424 for (i = 0; i < s->slice_count; i++)
2425 s2->er.error_count += s2->thread_context[i]->er.error_count;
2428 if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
2429 && uses_vdpau(avctx))
2430 ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2432 ret = slice_end(avctx, picture);
2436 // FIXME: merge with the stuff in mpeg_decode_slice
2437 if (s2->last_picture_ptr || s2->low_delay)
2443 if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2444 return AVERROR_INVALIDDATA;
2446 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2449 input_size = buf_end - buf_ptr;
2451 if (avctx->debug & FF_DEBUG_STARTCODE)
2452 av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2453 start_code, buf_ptr - buf, input_size);
2455 /* prepare data for next start code */
2456 switch (start_code) {
2457 case SEQ_START_CODE:
2458 if (last_code == 0) {
2459 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2460 if (buf != avctx->extradata)
2463 av_log(avctx, AV_LOG_ERROR,
2464 "ignoring SEQ_START_CODE after %X\n", last_code);
2465 if (avctx->err_recognition & AV_EF_EXPLODE)
2466 return AVERROR_INVALIDDATA;
2470 case PICTURE_START_CODE:
2471 if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2472 /* If it's a frame picture, there can't be more than one picture header.
2473 Yet, it does happen and we need to handle it. */
2474 av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2477 picture_start_code_seen = 1;
2479 if (s2->width <= 0 || s2->height <= 0) {
2480 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2481 s2->width, s2->height);
2482 return AVERROR_INVALIDDATA;
2486 s2->intra_dc_precision= 3;
2487 s2->intra_matrix[0]= 1;
2489 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2490 !avctx->hwaccel && s->slice_count) {
2493 avctx->execute(avctx, slice_decode_thread,
2494 s2->thread_context, NULL,
2495 s->slice_count, sizeof(void *));
2496 for (i = 0; i < s->slice_count; i++)
2497 s2->er.error_count += s2->thread_context[i]->er.error_count;
2500 if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2501 ret = mpeg_decode_postinit(avctx);
2503 av_log(avctx, AV_LOG_ERROR,
2504 "mpeg_decode_postinit() failure\n");
2508 /* We have a complete image: we try to decompress it. */
2509 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2512 last_code = PICTURE_START_CODE;
2514 av_log(avctx, AV_LOG_ERROR,
2515 "ignoring pic after %X\n", last_code);
2516 if (avctx->err_recognition & AV_EF_EXPLODE)
2517 return AVERROR_INVALIDDATA;
2520 case EXT_START_CODE:
2521 init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2523 switch (get_bits(&s2->gb, 4)) {
2525 if (last_code == 0) {
2526 mpeg_decode_sequence_extension(s);
2528 av_log(avctx, AV_LOG_ERROR,
2529 "ignoring seq ext after %X\n", last_code);
2530 if (avctx->err_recognition & AV_EF_EXPLODE)
2531 return AVERROR_INVALIDDATA;
2535 mpeg_decode_sequence_display_extension(s);
2538 mpeg_decode_quant_matrix_extension(s2);
2541 mpeg_decode_picture_display_extension(s);
2544 if (last_code == PICTURE_START_CODE) {
2545 mpeg_decode_picture_coding_extension(s);
2547 av_log(avctx, AV_LOG_ERROR,
2548 "ignoring pic cod ext after %X\n", last_code);
2549 if (avctx->err_recognition & AV_EF_EXPLODE)
2550 return AVERROR_INVALIDDATA;
2555 case USER_START_CODE:
2556 mpeg_decode_user_data(avctx, buf_ptr, input_size);
2558 case GOP_START_CODE:
2559 if (last_code == 0) {
2560 s2->first_field = 0;
2561 mpeg_decode_gop(avctx, buf_ptr, input_size);
2564 av_log(avctx, AV_LOG_ERROR,
2565 "ignoring GOP_START_CODE after %X\n", last_code);
2566 if (avctx->err_recognition & AV_EF_EXPLODE)
2567 return AVERROR_INVALIDDATA;
2571 if (start_code >= SLICE_MIN_START_CODE &&
2572 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2573 if (s2->progressive_sequence && !s2->progressive_frame) {
2574 s2->progressive_frame = 1;
2575 av_log(s2->avctx, AV_LOG_ERROR,
2576 "interlaced frame in progressive sequence, ignoring\n");
2579 if (s2->picture_structure == 0 ||
2580 (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2581 av_log(s2->avctx, AV_LOG_ERROR,
2582 "picture_structure %d invalid, ignoring\n",
2583 s2->picture_structure);
2584 s2->picture_structure = PICT_FRAME;
2587 if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2588 av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2590 if (s2->picture_structure == PICT_FRAME) {
2591 s2->first_field = 0;
2592 s2->v_edge_pos = 16 * s2->mb_height;
2594 s2->first_field ^= 1;
2595 s2->v_edge_pos = 8 * s2->mb_height;
2596 memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2599 if (start_code >= SLICE_MIN_START_CODE &&
2600 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2601 const int field_pic = s2->picture_structure != PICT_FRAME;
2602 int mb_y = start_code - SLICE_MIN_START_CODE;
2603 last_code = SLICE_MIN_START_CODE;
2604 if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2605 mb_y += (*buf_ptr&0xE0)<<2;
2608 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2611 if (buf_end - buf_ptr < 2) {
2612 av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2613 return AVERROR_INVALIDDATA;
2616 if (mb_y >= s2->mb_height) {
2617 av_log(s2->avctx, AV_LOG_ERROR,
2618 "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2619 return AVERROR_INVALIDDATA;
2622 if (!s2->last_picture_ptr) {
2623 /* Skip B-frames if we do not have reference frames and
2624 * GOP is not closed. */
2625 if (s2->pict_type == AV_PICTURE_TYPE_B) {
2626 if (!s2->closed_gop) {
2632 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
2634 if (!s2->next_picture_ptr) {
2635 /* Skip P-frames if we do not have a reference frame or
2636 * we have an invalid header. */
2637 if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2642 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2643 s2->pict_type == AV_PICTURE_TYPE_B) ||
2644 (avctx->skip_frame >= AVDISCARD_NONKEY &&
2645 s2->pict_type != AV_PICTURE_TYPE_I) ||
2646 avctx->skip_frame >= AVDISCARD_ALL) {
2651 if (!s->mpeg_enc_ctx_allocated)
2654 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2655 if (mb_y < avctx->skip_top ||
2656 mb_y >= s2->mb_height - avctx->skip_bottom)
2660 if (!s2->pict_type) {
2661 av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2662 if (avctx->err_recognition & AV_EF_EXPLODE)
2663 return AVERROR_INVALIDDATA;
2667 if (s->first_slice) {
2670 if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2673 if (!s2->current_picture_ptr) {
2674 av_log(avctx, AV_LOG_ERROR,
2675 "current_picture not initialized\n");
2676 return AVERROR_INVALIDDATA;
2679 if (uses_vdpau(avctx)) {
2685 (avctx->active_thread_type & FF_THREAD_SLICE) &&
2687 int threshold = (s2->mb_height * s->slice_count +
2688 s2->slice_context_count / 2) /
2689 s2->slice_context_count;
2690 av_assert0(avctx->thread_count > 1);
2691 if (threshold <= mb_y) {
2692 MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2694 thread_context->start_mb_y = mb_y;
2695 thread_context->end_mb_y = s2->mb_height;
2696 if (s->slice_count) {
2697 s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2698 ret = ff_update_duplicate_context(thread_context, s2);
2702 init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2705 buf_ptr += 2; // FIXME add minimum number of bytes per slice
2707 ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2711 if (avctx->err_recognition & AV_EF_EXPLODE)
2713 if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2714 ff_er_add_slice(&s2->er, s2->resync_mb_x,
2715 s2->resync_mb_y, s2->mb_x, s2->mb_y,
2716 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2718 ff_er_add_slice(&s2->er, s2->resync_mb_x,
2719 s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2720 ER_AC_END | ER_DC_END | ER_MV_END);
2729 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2730 int *got_output, AVPacket *avpkt)
2732 const uint8_t *buf = avpkt->data;
2734 int buf_size = avpkt->size;
2735 Mpeg1Context *s = avctx->priv_data;
2736 AVFrame *picture = data;
2737 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2739 if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2740 /* special case for last picture */
2741 if (s2->low_delay == 0 && s2->next_picture_ptr) {
2742 int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2746 s2->next_picture_ptr = NULL;
2753 if (s2->flags & CODEC_FLAG_TRUNCATED) {
2754 int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2757 if (ff_combine_frame(&s2->parse_context, next,
2758 (const uint8_t **) &buf, &buf_size) < 0)
2762 s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2763 if (s->mpeg_enc_ctx_allocated == 0 && ( s2->codec_tag == AV_RL32("VCR2")
2764 || s2->codec_tag == AV_RL32("BW10")
2766 vcr2_init_sequence(avctx);
2770 if (avctx->extradata && !s->extradata_decoded) {
2771 ret = decode_chunks(avctx, picture, got_output,
2772 avctx->extradata, avctx->extradata_size);
2774 av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2777 s->extradata_decoded = 1;
2778 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2779 s2->current_picture_ptr = NULL;
2784 ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2785 if (ret<0 || *got_output)
2786 s2->current_picture_ptr = NULL;
2791 static void flush(AVCodecContext *avctx)
2793 Mpeg1Context *s = avctx->priv_data;
2797 ff_mpeg_flush(avctx);
2800 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2802 Mpeg1Context *s = avctx->priv_data;
2804 if (s->mpeg_enc_ctx_allocated)
2805 ff_mpv_common_end(&s->mpeg_enc_ctx);
2806 av_freep(&s->a53_caption);
2810 static const AVProfile mpeg2_video_profiles[] = {
2811 { FF_PROFILE_MPEG2_422, "4:2:2" },
2812 { FF_PROFILE_MPEG2_HIGH, "High" },
2813 { FF_PROFILE_MPEG2_SS, "Spatially Scalable" },
2814 { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable" },
2815 { FF_PROFILE_MPEG2_MAIN, "Main" },
2816 { FF_PROFILE_MPEG2_SIMPLE, "Simple" },
2817 { FF_PROFILE_RESERVED, "Reserved" },
2818 { FF_PROFILE_RESERVED, "Reserved" },
2819 { FF_PROFILE_UNKNOWN },
2822 AVCodec ff_mpeg1video_decoder = {
2823 .name = "mpeg1video",
2824 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2825 .type = AVMEDIA_TYPE_VIDEO,
2826 .id = AV_CODEC_ID_MPEG1VIDEO,
2827 .priv_data_size = sizeof(Mpeg1Context),
2828 .init = mpeg_decode_init,
2829 .close = mpeg_decode_end,
2830 .decode = mpeg_decode_frame,
2831 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2832 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2833 CODEC_CAP_SLICE_THREADS,
2836 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2839 AVCodec ff_mpeg2video_decoder = {
2840 .name = "mpeg2video",
2841 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2842 .type = AVMEDIA_TYPE_VIDEO,
2843 .id = AV_CODEC_ID_MPEG2VIDEO,
2844 .priv_data_size = sizeof(Mpeg1Context),
2845 .init = mpeg_decode_init,
2846 .close = mpeg_decode_end,
2847 .decode = mpeg_decode_frame,
2848 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2849 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2850 CODEC_CAP_SLICE_THREADS,
2853 .profiles = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2857 AVCodec ff_mpegvideo_decoder = {
2858 .name = "mpegvideo",
2859 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2860 .type = AVMEDIA_TYPE_VIDEO,
2861 .id = AV_CODEC_ID_MPEG2VIDEO,
2862 .priv_data_size = sizeof(Mpeg1Context),
2863 .init = mpeg_decode_init,
2864 .close = mpeg_decode_end,
2865 .decode = mpeg_decode_frame,
2866 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2872 #if CONFIG_MPEG_XVMC_DECODER
2873 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2875 if (avctx->active_thread_type & FF_THREAD_SLICE)
2877 if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2879 if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2880 av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2882 mpeg_decode_init(avctx);
2884 avctx->pix_fmt = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2885 avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2890 AVCodec ff_mpeg_xvmc_decoder = {
2891 .name = "mpegvideo_xvmc",
2892 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2893 .type = AVMEDIA_TYPE_VIDEO,
2894 .id = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2895 .priv_data_size = sizeof(Mpeg1Context),
2896 .init = mpeg_mc_decode_init,
2897 .close = mpeg_decode_end,
2898 .decode = mpeg_decode_frame,
2899 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2900 CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2905 #endif /* FF_API_XVMC */
2907 #if CONFIG_MPEG_VDPAU_DECODER
2908 AVCodec ff_mpeg_vdpau_decoder = {
2909 .name = "mpegvideo_vdpau",
2910 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2911 .type = AVMEDIA_TYPE_VIDEO,
2912 .id = AV_CODEC_ID_MPEG2VIDEO,
2913 .priv_data_size = sizeof(Mpeg1Context),
2914 .init = mpeg_decode_init,
2915 .close = mpeg_decode_end,
2916 .decode = mpeg_decode_frame,
2917 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2918 CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2923 #if CONFIG_MPEG1_VDPAU_DECODER
2924 AVCodec ff_mpeg1_vdpau_decoder = {
2925 .name = "mpeg1video_vdpau",
2926 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2927 .type = AVMEDIA_TYPE_VIDEO,
2928 .id = AV_CODEC_ID_MPEG1VIDEO,
2929 .priv_data_size = sizeof(Mpeg1Context),
2930 .init = mpeg_decode_init,
2931 .close = mpeg_decode_end,
2932 .decode = mpeg_decode_frame,
2933 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2934 CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,