3 * Copyright (c) 2000, 2001 Fabrice Bellard
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of Libav.
8 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
30 #include "libavutil/attributes.h"
31 #include "libavutil/internal.h"
32 #include "libavutil/stereo3d.h"
35 #include "bytestream.h"
36 #include "error_resilience.h"
42 #include "mpeg12data.h"
43 #include "mpegutils.h"
44 #include "mpegvideo.h"
45 #include "mpegvideodata.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? */
66 int closed_gop; /* GOP is closed */
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 MAX_INDEX (64 - 1)
132 #define check_scantable_index(ctx, x) \
134 if ((x) > MAX_INDEX) { \
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_inter(MpegEncContext *s,
142 int16_t *block, int n)
144 int level, 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->inter_matrix;
148 const int qscale = s->qscale;
151 OPEN_READER(re, &s->gb);
153 // special case for first coefficient, no need to add second VLC table
154 UPDATE_CACHE(re, &s->gb);
155 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
156 level = (3 * qscale * quant_matrix[0]) >> 5;
157 level = (level - 1) | 1;
158 if (GET_CACHE(re, &s->gb) & 0x40000000)
162 SKIP_BITS(re, &s->gb, 2);
163 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
166 /* now quantify & encode AC coefficients */
168 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
176 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
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);
201 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
202 level = (level - 1) | 1;
205 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
206 level = (level - 1) | 1;
211 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);
220 check_scantable_index(s, i);
222 s->block_last_index[n] = i;
226 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
227 int16_t *block, int n)
229 int level, i, j, run;
230 RLTable *rl = &ff_rl_mpeg1;
231 uint8_t *const scantable = s->intra_scantable.permutated;
232 const int qscale = s->qscale;
235 OPEN_READER(re, &s->gb);
237 // Special case for first coefficient, no need to add second VLC table.
238 UPDATE_CACHE(re, &s->gb);
239 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
240 level = (3 * qscale) >> 1;
241 level = (level - 1) | 1;
242 if (GET_CACHE(re, &s->gb) & 0x40000000)
246 SKIP_BITS(re, &s->gb, 2);
247 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
251 /* now quantify & encode AC coefficients */
253 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
261 level = ((level * 2 + 1) * qscale) >> 1;
262 level = (level - 1) | 1;
263 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
264 SHOW_SBITS(re, &s->gb, 1);
265 SKIP_BITS(re, &s->gb, 1);
268 run = SHOW_UBITS(re, &s->gb, 6) + 1;
269 LAST_SKIP_BITS(re, &s->gb, 6);
270 UPDATE_CACHE(re, &s->gb);
271 level = SHOW_SBITS(re, &s->gb, 8);
272 SKIP_BITS(re, &s->gb, 8);
274 level = SHOW_UBITS(re, &s->gb, 8) - 256;
275 SKIP_BITS(re, &s->gb, 8);
276 } else if (level == 0) {
277 level = SHOW_UBITS(re, &s->gb, 8);
278 SKIP_BITS(re, &s->gb, 8);
286 level = ((level * 2 + 1) * qscale) >> 1;
287 level = (level - 1) | 1;
290 level = ((level * 2 + 1) * qscale) >> 1;
291 level = (level - 1) | 1;
296 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
298 UPDATE_CACHE(re, &s->gb);
301 LAST_SKIP_BITS(re, &s->gb, 2);
302 CLOSE_READER(re, &s->gb);
305 check_scantable_index(s, i);
307 s->block_last_index[n] = i;
311 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
312 int16_t *block, int n)
314 int level, i, j, run;
315 RLTable *rl = &ff_rl_mpeg1;
316 uint8_t *const scantable = s->intra_scantable.permutated;
317 const uint16_t *quant_matrix;
318 const int qscale = s->qscale;
324 OPEN_READER(re, &s->gb);
327 quant_matrix = s->inter_matrix;
329 quant_matrix = s->chroma_inter_matrix;
331 // Special case for first coefficient, no need to add second VLC table.
332 UPDATE_CACHE(re, &s->gb);
333 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
334 level = (3 * qscale * quant_matrix[0]) >> 5;
335 if (GET_CACHE(re, &s->gb) & 0x40000000)
340 SKIP_BITS(re, &s->gb, 2);
341 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
345 /* now quantify & encode AC coefficients */
347 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
355 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
356 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
357 SHOW_SBITS(re, &s->gb, 1);
358 SKIP_BITS(re, &s->gb, 1);
361 run = SHOW_UBITS(re, &s->gb, 6) + 1;
362 LAST_SKIP_BITS(re, &s->gb, 6);
363 UPDATE_CACHE(re, &s->gb);
364 level = SHOW_SBITS(re, &s->gb, 12);
365 SKIP_BITS(re, &s->gb, 12);
372 level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
375 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
381 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
383 UPDATE_CACHE(re, &s->gb);
386 LAST_SKIP_BITS(re, &s->gb, 2);
387 CLOSE_READER(re, &s->gb);
389 block[63] ^= (mismatch & 1);
391 check_scantable_index(s, i);
393 s->block_last_index[n] = i;
397 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
398 int16_t *block, int n)
400 int level, i, j, run;
401 RLTable *rl = &ff_rl_mpeg1;
402 uint8_t *const scantable = s->intra_scantable.permutated;
403 const int qscale = s->qscale;
404 OPEN_READER(re, &s->gb);
407 // special case for first coefficient, no need to add second VLC table
408 UPDATE_CACHE(re, &s->gb);
409 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
410 level = (3 * qscale) >> 1;
411 if (GET_CACHE(re, &s->gb) & 0x40000000)
415 SKIP_BITS(re, &s->gb, 2);
416 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
420 /* now quantify & encode AC coefficients */
422 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
429 level = ((level * 2 + 1) * qscale) >> 1;
430 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
431 SHOW_SBITS(re, &s->gb, 1);
432 SKIP_BITS(re, &s->gb, 1);
435 run = SHOW_UBITS(re, &s->gb, 6) + 1;
436 LAST_SKIP_BITS(re, &s->gb, 6);
437 UPDATE_CACHE(re, &s->gb);
438 level = SHOW_SBITS(re, &s->gb, 12);
439 SKIP_BITS(re, &s->gb, 12);
446 level = ((-level * 2 + 1) * qscale) >> 1;
449 level = ((level * 2 + 1) * qscale) >> 1;
454 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
456 UPDATE_CACHE(re, &s->gb);
459 LAST_SKIP_BITS(re, &s->gb, 2);
460 CLOSE_READER(re, &s->gb);
462 check_scantable_index(s, i);
464 s->block_last_index[n] = i;
468 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
469 int16_t *block, int n)
471 int level, dc, diff, i, j, run;
474 uint8_t *const scantable = s->intra_scantable.permutated;
475 const uint16_t *quant_matrix;
476 const int qscale = s->qscale;
481 quant_matrix = s->intra_matrix;
484 quant_matrix = s->chroma_intra_matrix;
485 component = (n & 1) + 1;
487 diff = decode_dc(&s->gb, component);
489 return AVERROR_INVALIDDATA;
490 dc = s->last_dc[component];
492 s->last_dc[component] = dc;
493 block[0] = dc << (3 - s->intra_dc_precision);
494 ff_dlog(s->avctx, "dc=%d\n", block[0]);
495 mismatch = block[0] ^ 1;
497 if (s->intra_vlc_format)
503 OPEN_READER(re, &s->gb);
504 /* now quantify & encode AC coefficients */
506 UPDATE_CACHE(re, &s->gb);
507 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
512 } else if (level != 0) {
517 level = (level * qscale * quant_matrix[j]) >> 4;
518 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
519 SHOW_SBITS(re, &s->gb, 1);
520 LAST_SKIP_BITS(re, &s->gb, 1);
523 run = SHOW_UBITS(re, &s->gb, 6) + 1;
524 LAST_SKIP_BITS(re, &s->gb, 6);
525 UPDATE_CACHE(re, &s->gb);
526 level = SHOW_SBITS(re, &s->gb, 12);
527 SKIP_BITS(re, &s->gb, 12);
533 level = (-level * qscale * quant_matrix[j]) >> 4;
536 level = (level * qscale * quant_matrix[j]) >> 4;
543 CLOSE_READER(re, &s->gb);
545 block[63] ^= mismatch & 1;
547 check_scantable_index(s, i);
549 s->block_last_index[n] = i;
553 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
554 int16_t *block, int n)
556 int level, dc, diff, i, j, run;
559 uint8_t *const scantable = s->intra_scantable.permutated;
560 const uint16_t *quant_matrix;
561 const int qscale = s->qscale;
565 quant_matrix = s->intra_matrix;
568 quant_matrix = s->chroma_intra_matrix;
569 component = (n & 1) + 1;
571 diff = decode_dc(&s->gb, component);
573 return AVERROR_INVALIDDATA;
574 dc = s->last_dc[component];
576 s->last_dc[component] = dc;
577 block[0] = dc << (3 - s->intra_dc_precision);
579 if (s->intra_vlc_format)
585 OPEN_READER(re, &s->gb);
586 /* now quantify & encode AC coefficients */
588 UPDATE_CACHE(re, &s->gb);
589 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
594 } else if (level != 0) {
599 level = (level * qscale * quant_matrix[j]) >> 4;
600 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
601 SHOW_SBITS(re, &s->gb, 1);
602 LAST_SKIP_BITS(re, &s->gb, 1);
605 run = SHOW_UBITS(re, &s->gb, 6) + 1;
606 LAST_SKIP_BITS(re, &s->gb, 6);
607 UPDATE_CACHE(re, &s->gb);
608 level = SHOW_SBITS(re, &s->gb, 12);
609 SKIP_BITS(re, &s->gb, 12);
615 level = (-level * qscale * quant_matrix[j]) >> 4;
618 level = (level * qscale * quant_matrix[j]) >> 4;
624 CLOSE_READER(re, &s->gb);
627 check_scantable_index(s, i);
629 s->block_last_index[n] = i;
633 /******************************************/
636 static inline int get_dmv(MpegEncContext *s)
638 if (get_bits1(&s->gb))
639 return 1 - (get_bits1(&s->gb) << 1);
644 static inline int get_qscale(MpegEncContext *s)
646 int qscale = get_bits(&s->gb, 5);
648 return non_linear_qscale[qscale];
653 /* motion type (for MPEG-2) */
659 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
661 int i, j, k, cbp, val, mb_type, motion_type;
662 const int mb_block_count = 4 + (1 << s->chroma_format);
665 ff_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
667 assert(s->mb_skipped == 0);
669 if (s->mb_skip_run-- != 0) {
670 if (s->pict_type == AV_PICTURE_TYPE_P) {
672 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
673 MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
678 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
680 // FIXME not sure if this is allowed in MPEG at all
681 mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
682 if (IS_INTRA(mb_type))
683 return AVERROR_INVALIDDATA;
684 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
685 mb_type | MB_TYPE_SKIP;
686 // assert(s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1] & (MB_TYPE_16x16 | MB_TYPE_16x8));
688 if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
695 switch (s->pict_type) {
697 case AV_PICTURE_TYPE_I:
698 if (get_bits1(&s->gb) == 0) {
699 if (get_bits1(&s->gb) == 0) {
700 av_log(s->avctx, AV_LOG_ERROR,
701 "Invalid mb type in I-frame at %d %d\n",
703 return AVERROR_INVALIDDATA;
705 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
707 mb_type = MB_TYPE_INTRA;
710 case AV_PICTURE_TYPE_P:
711 mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
713 av_log(s->avctx, AV_LOG_ERROR,
714 "Invalid mb type in P-frame at %d %d\n", s->mb_x, s->mb_y);
715 return AVERROR_INVALIDDATA;
717 mb_type = ptype2mb_type[mb_type];
719 case AV_PICTURE_TYPE_B:
720 mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
722 av_log(s->avctx, AV_LOG_ERROR,
723 "Invalid mb type in B-frame at %d %d\n", s->mb_x, s->mb_y);
724 return AVERROR_INVALIDDATA;
726 mb_type = btype2mb_type[mb_type];
729 ff_dlog(s->avctx, "mb_type=%x\n", mb_type);
730 // motion_type = 0; /* avoid warning */
731 if (IS_INTRA(mb_type)) {
732 s->bdsp.clear_blocks(s->block[0]);
734 if (!s->chroma_y_shift)
735 s->bdsp.clear_blocks(s->block[6]);
737 /* compute DCT type */
738 // FIXME: add an interlaced_dct coded var?
739 if (s->picture_structure == PICT_FRAME &&
740 !s->frame_pred_frame_dct)
741 s->interlaced_dct = get_bits1(&s->gb);
743 if (IS_QUANT(mb_type))
744 s->qscale = get_qscale(s);
746 if (s->concealment_motion_vectors) {
747 /* just parse them */
748 if (s->picture_structure != PICT_FRAME)
749 skip_bits1(&s->gb); /* field select */
752 s->last_mv[0][0][0] =
753 s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
754 s->last_mv[0][0][0]);
756 s->last_mv[0][0][1] =
757 s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
758 s->last_mv[0][0][1]);
760 skip_bits1(&s->gb); /* marker */
762 /* reset mv prediction */
763 memset(s->last_mv, 0, sizeof(s->last_mv));
767 if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
768 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
769 for (i = 0; i < 6; i++)
770 mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
772 for (i = 0; i < mb_block_count; i++)
773 if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
777 for (i = 0; i < 6; i++) {
778 ret = ff_mpeg1_decode_block_intra(&s->gb,
780 s->intra_scantable.permutated,
781 s->last_dc, *s->pblocks[i],
784 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
789 s->block_last_index[i] = ret;
793 if (mb_type & MB_TYPE_ZERO_MV) {
794 assert(mb_type & MB_TYPE_CBP);
796 s->mv_dir = MV_DIR_FORWARD;
797 if (s->picture_structure == PICT_FRAME) {
798 if (!s->frame_pred_frame_dct)
799 s->interlaced_dct = get_bits1(&s->gb);
800 s->mv_type = MV_TYPE_16X16;
802 s->mv_type = MV_TYPE_FIELD;
803 mb_type |= MB_TYPE_INTERLACED;
804 s->field_select[0][0] = s->picture_structure - 1;
807 if (IS_QUANT(mb_type))
808 s->qscale = get_qscale(s);
810 s->last_mv[0][0][0] = 0;
811 s->last_mv[0][0][1] = 0;
812 s->last_mv[0][1][0] = 0;
813 s->last_mv[0][1][1] = 0;
817 assert(mb_type & MB_TYPE_L0L1);
818 // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
819 /* get additional motion vector type */
820 if (s->frame_pred_frame_dct) {
821 motion_type = MT_FRAME;
823 motion_type = get_bits(&s->gb, 2);
824 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
825 s->interlaced_dct = get_bits1(&s->gb);
828 if (IS_QUANT(mb_type))
829 s->qscale = get_qscale(s);
832 s->mv_dir = (mb_type >> 13) & 3;
833 ff_dlog(s->avctx, "motion_type=%d\n", motion_type);
834 switch (motion_type) {
835 case MT_FRAME: /* or MT_16X8 */
836 if (s->picture_structure == PICT_FRAME) {
837 mb_type |= MB_TYPE_16x16;
838 s->mv_type = MV_TYPE_16X16;
839 for (i = 0; i < 2; i++) {
840 if (USES_LIST(mb_type, i)) {
843 s->last_mv[i][0][0] =
844 s->last_mv[i][1][0] =
845 mpeg_decode_motion(s, s->mpeg_f_code[i][0],
846 s->last_mv[i][0][0]);
848 s->last_mv[i][0][1] =
849 s->last_mv[i][1][1] =
850 mpeg_decode_motion(s, s->mpeg_f_code[i][1],
851 s->last_mv[i][0][1]);
852 /* full_pel: only for MPEG-1 */
853 if (s->full_pel[i]) {
854 s->mv[i][0][0] <<= 1;
855 s->mv[i][0][1] <<= 1;
860 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
861 s->mv_type = MV_TYPE_16X8;
862 for (i = 0; i < 2; i++) {
863 if (USES_LIST(mb_type, i)) {
865 for (j = 0; j < 2; j++) {
866 s->field_select[i][j] = get_bits1(&s->gb);
867 for (k = 0; k < 2; k++) {
868 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
869 s->last_mv[i][j][k]);
870 s->last_mv[i][j][k] = val;
871 s->mv[i][j][k] = val;
879 s->mv_type = MV_TYPE_FIELD;
880 if (s->picture_structure == PICT_FRAME) {
881 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
882 for (i = 0; i < 2; i++) {
883 if (USES_LIST(mb_type, i)) {
884 for (j = 0; j < 2; j++) {
885 s->field_select[i][j] = get_bits1(&s->gb);
886 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
887 s->last_mv[i][j][0]);
888 s->last_mv[i][j][0] = val;
889 s->mv[i][j][0] = val;
890 ff_dlog(s->avctx, "fmx=%d\n", val);
891 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
892 s->last_mv[i][j][1] >> 1);
893 s->last_mv[i][j][1] = val << 1;
894 s->mv[i][j][1] = val;
895 ff_dlog(s->avctx, "fmy=%d\n", val);
900 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
901 for (i = 0; i < 2; i++) {
902 if (USES_LIST(mb_type, i)) {
903 s->field_select[i][0] = get_bits1(&s->gb);
904 for (k = 0; k < 2; k++) {
905 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
906 s->last_mv[i][0][k]);
907 s->last_mv[i][0][k] = val;
908 s->last_mv[i][1][k] = val;
909 s->mv[i][0][k] = val;
916 s->mv_type = MV_TYPE_DMV;
917 for (i = 0; i < 2; i++) {
918 if (USES_LIST(mb_type, i)) {
919 int dmx, dmy, mx, my, m;
920 const int my_shift = s->picture_structure == PICT_FRAME;
922 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
923 s->last_mv[i][0][0]);
924 s->last_mv[i][0][0] = mx;
925 s->last_mv[i][1][0] = mx;
927 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
928 s->last_mv[i][0][1] >> my_shift);
932 s->last_mv[i][0][1] = my << my_shift;
933 s->last_mv[i][1][1] = my << my_shift;
937 s->mv[i][1][0] = mx; // not used
938 s->mv[i][1][1] = my; // not used
940 if (s->picture_structure == PICT_FRAME) {
941 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
943 // m = 1 + 2 * s->top_field_first;
944 m = s->top_field_first ? 1 : 3;
946 /* top -> top pred */
947 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
948 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
950 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
951 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
953 mb_type |= MB_TYPE_16x16;
955 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
956 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
957 if (s->picture_structure == PICT_TOP_FIELD)
966 av_log(s->avctx, AV_LOG_ERROR,
967 "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
968 return AVERROR_INVALIDDATA;
973 if (HAS_CBP(mb_type)) {
974 s->bdsp.clear_blocks(s->block[0]);
976 cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
977 if (mb_block_count > 6) {
978 cbp <<= mb_block_count - 6;
979 cbp |= get_bits(&s->gb, mb_block_count - 6);
980 s->bdsp.clear_blocks(s->block[6]);
983 av_log(s->avctx, AV_LOG_ERROR,
984 "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
985 return AVERROR_INVALIDDATA;
988 if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
989 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
990 for (i = 0; i < 6; i++) {
992 mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
994 s->block_last_index[i] = -1;
998 cbp <<= 12 - mb_block_count;
1000 for (i = 0; i < mb_block_count; i++) {
1001 if (cbp & (1 << 11)) {
1002 if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1005 s->block_last_index[i] = -1;
1011 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1012 for (i = 0; i < 6; i++) {
1014 mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1016 s->block_last_index[i] = -1;
1020 for (i = 0; i < 6; i++) {
1022 if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1025 s->block_last_index[i] = -1;
1032 for (i = 0; i < 12; i++)
1033 s->block_last_index[i] = -1;
1037 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1042 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1044 Mpeg1Context *s = avctx->priv_data;
1045 MpegEncContext *s2 = &s->mpeg_enc_ctx;
1047 ff_mpv_decode_defaults(s2);
1049 s->mpeg_enc_ctx.avctx = avctx;
1051 /* we need some permutation to store matrices,
1052 * until the decoder sets the real permutation. */
1053 ff_mpv_idct_init(s2);
1054 ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1055 ff_mpeg12_init_vlcs();
1057 s->mpeg_enc_ctx_allocated = 0;
1058 s->mpeg_enc_ctx.picture_number = 0;
1059 s->repeat_field = 0;
1060 s->mpeg_enc_ctx.codec_id = avctx->codec->id;
1061 avctx->color_range = AVCOL_RANGE_MPEG;
1062 if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1063 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1065 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1069 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1070 const AVCodecContext *avctx_from)
1072 Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1073 MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1076 if (avctx == avctx_from ||
1077 !ctx_from->mpeg_enc_ctx_allocated ||
1078 !s1->context_initialized)
1081 err = ff_mpeg_update_thread_context(avctx, avctx_from);
1085 if (!ctx->mpeg_enc_ctx_allocated) {
1086 // copy the whole context after the initial MpegEncContext structure
1087 memcpy(ctx, ctx_from, sizeof(*ctx));
1088 memset(&ctx->mpeg_enc_ctx, 0, sizeof(ctx->mpeg_enc_ctx));
1091 if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1092 s->picture_number++;
1097 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1098 const uint8_t *new_perm)
1100 uint16_t temp_matrix[64];
1103 memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1105 for (i = 0; i < 64; i++)
1106 matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1109 static const enum AVPixelFormat mpeg12_hwaccel_pixfmt_list_420[] = {
1110 #if CONFIG_MPEG2_DXVA2_HWACCEL
1111 AV_PIX_FMT_DXVA2_VLD,
1113 #if CONFIG_MPEG2_D3D11VA_HWACCEL
1114 AV_PIX_FMT_D3D11VA_VLD,
1117 #if CONFIG_MPEG2_VAAPI_HWACCEL
1120 #if CONFIG_MPEG1_VDPAU_HWACCEL | CONFIG_MPEG2_VDPAU_HWACCEL
1127 static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1132 static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1137 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1139 Mpeg1Context *s1 = avctx->priv_data;
1140 MpegEncContext *s = &s1->mpeg_enc_ctx;
1141 const enum AVPixelFormat *pix_fmts;
1143 if (s->chroma_format < 2)
1144 pix_fmts = mpeg12_hwaccel_pixfmt_list_420;
1145 else if (s->chroma_format == 2)
1146 pix_fmts = mpeg12_pixfmt_list_422;
1148 pix_fmts = mpeg12_pixfmt_list_444;
1150 return ff_get_format(avctx, pix_fmts);
1153 /* Call this function when we know all parameters.
1154 * It may be called in different places for MPEG-1 and MPEG-2. */
1155 static int mpeg_decode_postinit(AVCodecContext *avctx)
1157 Mpeg1Context *s1 = avctx->priv_data;
1158 MpegEncContext *s = &s1->mpeg_enc_ctx;
1159 uint8_t old_permutation[64];
1162 if ((s1->mpeg_enc_ctx_allocated == 0) ||
1163 avctx->coded_width != s->width ||
1164 avctx->coded_height != s->height ||
1165 s1->save_width != s->width ||
1166 s1->save_height != s->height ||
1167 s1->save_aspect_info != s->aspect_ratio_info ||
1168 s1->save_progressive_seq != s->progressive_sequence ||
1170 if (s1->mpeg_enc_ctx_allocated) {
1171 ParseContext pc = s->parse_context;
1172 s->parse_context.buffer = 0;
1173 ff_mpv_common_end(s);
1174 s->parse_context = pc;
1177 ret = ff_set_dimensions(avctx, s->width, s->height);
1181 avctx->bit_rate = s->bit_rate;
1182 s1->save_aspect_info = s->aspect_ratio_info;
1183 s1->save_width = s->width;
1184 s1->save_height = s->height;
1185 s1->save_progressive_seq = s->progressive_sequence;
1187 /* low_delay may be forced, in this case we will have B-frames
1188 * that behave like P-frames. */
1189 avctx->has_b_frames = !s->low_delay;
1191 if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1193 avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1195 avctx->sample_aspect_ratio = av_d2q(1.0 / ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1196 avctx->ticks_per_frame = 1;
1199 av_reduce(&s->avctx->framerate.num,
1200 &s->avctx->framerate.den,
1201 ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num * 2,
1202 ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1204 avctx->ticks_per_frame = 2;
1206 if (s->aspect_ratio_info > 1) {
1208 av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1209 (AVRational) { s1->pan_scan.width,
1210 s1->pan_scan.height }),
1211 (AVRational) { s->width, s->height });
1213 /* We ignore the spec here and guess a bit as reality does not
1214 * match the spec, see for example res_change_ffmpeg_aspect.ts
1215 * and sequence-display-aspect.mpg.
1216 * issue1613, 621, 562 */
1217 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1218 (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1219 av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1220 s->avctx->sample_aspect_ratio =
1221 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1222 (AVRational) { s->width, s->height });
1224 s->avctx->sample_aspect_ratio =
1225 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1226 (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1227 // issue1613 4/3 16/9 -> 16/9
1228 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1229 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1230 // s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1231 ff_dlog(avctx, "A %d/%d\n",
1232 ff_mpeg2_aspect[s->aspect_ratio_info].num,
1233 ff_mpeg2_aspect[s->aspect_ratio_info].den);
1234 ff_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1235 s->avctx->sample_aspect_ratio.den);
1238 s->avctx->sample_aspect_ratio =
1239 ff_mpeg2_aspect[s->aspect_ratio_info];
1243 ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
1245 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1246 // until then pix_fmt may be changed right after codec init
1247 if (avctx->hwaccel && avctx->idct_algo == FF_IDCT_AUTO)
1248 avctx->idct_algo = FF_IDCT_SIMPLE;
1250 /* Quantization matrices may need reordering
1251 * if DCT permutation is changed. */
1252 memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1254 ff_mpv_idct_init(s);
1255 if ((ret = ff_mpv_common_init(s)) < 0)
1258 quant_matrix_rebuild(s->intra_matrix, old_permutation, s->idsp.idct_permutation);
1259 quant_matrix_rebuild(s->inter_matrix, old_permutation, s->idsp.idct_permutation);
1260 quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1261 quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1263 s1->mpeg_enc_ctx_allocated = 1;
1268 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1271 Mpeg1Context *s1 = avctx->priv_data;
1272 MpegEncContext *s = &s1->mpeg_enc_ctx;
1273 int ref, f_code, vbv_delay;
1275 init_get_bits(&s->gb, buf, buf_size * 8);
1277 ref = get_bits(&s->gb, 10); /* temporal ref */
1278 s->pict_type = get_bits(&s->gb, 3);
1279 if (s->pict_type == 0 || s->pict_type > 3)
1280 return AVERROR_INVALIDDATA;
1282 vbv_delay = get_bits(&s->gb, 16);
1283 if (s->pict_type == AV_PICTURE_TYPE_P ||
1284 s->pict_type == AV_PICTURE_TYPE_B) {
1285 s->full_pel[0] = get_bits1(&s->gb);
1286 f_code = get_bits(&s->gb, 3);
1287 if (f_code == 0 && (avctx->err_recognition & AV_EF_BITSTREAM))
1288 return AVERROR_INVALIDDATA;
1289 s->mpeg_f_code[0][0] = f_code;
1290 s->mpeg_f_code[0][1] = f_code;
1292 if (s->pict_type == AV_PICTURE_TYPE_B) {
1293 s->full_pel[1] = get_bits1(&s->gb);
1294 f_code = get_bits(&s->gb, 3);
1295 if (f_code == 0 && (avctx->err_recognition & AV_EF_BITSTREAM))
1296 return AVERROR_INVALIDDATA;
1297 s->mpeg_f_code[1][0] = f_code;
1298 s->mpeg_f_code[1][1] = f_code;
1300 s->current_picture.f->pict_type = s->pict_type;
1301 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1303 if (avctx->debug & FF_DEBUG_PICT_INFO)
1304 av_log(avctx, AV_LOG_DEBUG,
1305 "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1312 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1314 MpegEncContext *s = &s1->mpeg_enc_ctx;
1315 int horiz_size_ext, vert_size_ext;
1318 skip_bits(&s->gb, 1); /* profile and level esc*/
1319 s->avctx->profile = get_bits(&s->gb, 3);
1320 s->avctx->level = get_bits(&s->gb, 4);
1321 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1322 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1323 horiz_size_ext = get_bits(&s->gb, 2);
1324 vert_size_ext = get_bits(&s->gb, 2);
1325 s->width |= (horiz_size_ext << 12);
1326 s->height |= (vert_size_ext << 12);
1328 bit_rate_ext = get_bits(&s->gb, 12) << 18;
1329 if (bit_rate_ext < INT_MAX / 400 &&
1330 bit_rate_ext * 400 < INT_MAX - s->bit_rate) {
1331 s->bit_rate += bit_rate_ext * 400;
1333 av_log(s->avctx, AV_LOG_WARNING, "Invalid bit rate extension value: %d\n",
1334 bit_rate_ext >> 18);
1338 skip_bits1(&s->gb); /* marker */
1339 s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1341 s->low_delay = get_bits1(&s->gb);
1342 if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
1345 s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1346 s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1348 ff_dlog(s->avctx, "sequence extension\n");
1349 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1351 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1352 av_log(s->avctx, AV_LOG_DEBUG,
1353 "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1354 s->avctx->profile, s->avctx->level,
1355 s->avctx->rc_buffer_size, s->bit_rate);
1358 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1360 MpegEncContext *s = &s1->mpeg_enc_ctx;
1361 int color_description, w, h;
1363 skip_bits(&s->gb, 3); /* video format */
1364 color_description = get_bits1(&s->gb);
1365 if (color_description) {
1366 s->avctx->color_primaries = get_bits(&s->gb, 8);
1367 s->avctx->color_trc = get_bits(&s->gb, 8);
1368 s->avctx->colorspace = get_bits(&s->gb, 8);
1370 w = get_bits(&s->gb, 14);
1371 skip_bits(&s->gb, 1); // marker
1372 h = get_bits(&s->gb, 14);
1373 // remaining 3 bits are zero padding
1375 s1->pan_scan.width = 16 * w;
1376 s1->pan_scan.height = 16 * h;
1378 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1379 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1382 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1384 MpegEncContext *s = &s1->mpeg_enc_ctx;
1388 if (s->progressive_sequence) {
1389 if (s->repeat_first_field) {
1391 if (s->top_field_first)
1395 if (s->picture_structure == PICT_FRAME) {
1397 if (s->repeat_first_field)
1401 for (i = 0; i < nofco; i++) {
1402 s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1403 skip_bits(&s->gb, 1); // marker
1404 s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1405 skip_bits(&s->gb, 1); // marker
1408 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1409 av_log(s->avctx, AV_LOG_DEBUG,
1410 "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1411 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1412 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1413 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1416 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1417 uint16_t matrix1[64], int intra)
1421 for (i = 0; i < 64; i++) {
1422 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1423 int v = get_bits(&s->gb, 8);
1425 av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1426 return AVERROR_INVALIDDATA;
1428 if (intra && i == 0 && v != 8) {
1429 av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
1430 v = 8; // needed by pink.mpg / issue1046
1439 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1441 ff_dlog(s->avctx, "matrix extension\n");
1443 if (get_bits1(&s->gb))
1444 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1445 if (get_bits1(&s->gb))
1446 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1447 if (get_bits1(&s->gb))
1448 load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1449 if (get_bits1(&s->gb))
1450 load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1453 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1455 MpegEncContext *s = &s1->mpeg_enc_ctx;
1457 s->full_pel[0] = s->full_pel[1] = 0;
1458 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1459 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1460 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1461 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1462 if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1463 av_log(s->avctx, AV_LOG_ERROR,
1464 "Missing picture start code, guessing missing values\n");
1465 if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1466 if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1467 s->pict_type = AV_PICTURE_TYPE_I;
1469 s->pict_type = AV_PICTURE_TYPE_P;
1471 s->pict_type = AV_PICTURE_TYPE_B;
1472 s->current_picture.f->pict_type = s->pict_type;
1473 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1475 s->intra_dc_precision = get_bits(&s->gb, 2);
1476 s->picture_structure = get_bits(&s->gb, 2);
1477 s->top_field_first = get_bits1(&s->gb);
1478 s->frame_pred_frame_dct = get_bits1(&s->gb);
1479 s->concealment_motion_vectors = get_bits1(&s->gb);
1480 s->q_scale_type = get_bits1(&s->gb);
1481 s->intra_vlc_format = get_bits1(&s->gb);
1482 s->alternate_scan = get_bits1(&s->gb);
1483 s->repeat_first_field = get_bits1(&s->gb);
1484 s->chroma_420_type = get_bits1(&s->gb);
1485 s->progressive_frame = get_bits1(&s->gb);
1487 if (s->progressive_sequence && !s->progressive_frame) {
1488 s->progressive_frame = 1;
1489 av_log(s->avctx, AV_LOG_ERROR,
1490 "interlaced frame in progressive sequence, ignoring\n");
1493 if (s->picture_structure == 0 ||
1494 (s->progressive_frame && s->picture_structure != PICT_FRAME)) {
1495 av_log(s->avctx, AV_LOG_ERROR,
1496 "picture_structure %d invalid, ignoring\n",
1497 s->picture_structure);
1498 s->picture_structure = PICT_FRAME;
1501 if (s->progressive_sequence && !s->frame_pred_frame_dct)
1502 av_log(s->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
1504 if (s->picture_structure == PICT_FRAME) {
1505 s->v_edge_pos = 16 * s->mb_height;
1507 s->v_edge_pos = 8 * s->mb_height;
1508 memset(s->mbskip_table, 0, s->mb_stride * s->mb_height);
1511 if (s->alternate_scan) {
1512 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1513 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1515 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1516 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1519 /* composite display not parsed */
1520 ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1521 ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1522 ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1523 ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1524 ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1525 ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1526 ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1527 ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1528 ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1531 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1533 AVCodecContext *avctx = s->avctx;
1534 Mpeg1Context *s1 = (Mpeg1Context *) s;
1537 if (s->picture_structure == PICT_FRAME)
1540 s->first_field ^= 1;
1542 /* start frame decoding */
1543 if (s->first_field || s->picture_structure == PICT_FRAME) {
1544 AVFrameSideData *pan_scan;
1546 if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1549 ff_mpeg_er_frame_start(s);
1551 /* first check if we must repeat the frame */
1552 s->current_picture_ptr->f->repeat_pict = 0;
1553 if (s->repeat_first_field) {
1554 if (s->progressive_sequence) {
1555 if (s->top_field_first)
1556 s->current_picture_ptr->f->repeat_pict = 4;
1558 s->current_picture_ptr->f->repeat_pict = 2;
1559 } else if (s->progressive_frame) {
1560 s->current_picture_ptr->f->repeat_pict = 1;
1564 pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1565 AV_FRAME_DATA_PANSCAN,
1566 sizeof(s1->pan_scan));
1568 return AVERROR(ENOMEM);
1569 memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1571 if (s1->a53_caption) {
1572 AVFrameSideData *sd = av_frame_new_side_data(
1573 s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1574 s1->a53_caption_size);
1576 memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1577 av_freep(&s1->a53_caption);
1580 if (s1->has_stereo3d) {
1581 AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1583 return AVERROR(ENOMEM);
1585 *stereo = s1->stereo3d;
1586 s1->has_stereo3d = 0;
1590 AVFrameSideData *sd =
1591 av_frame_new_side_data(s->current_picture_ptr->f,
1592 AV_FRAME_DATA_AFD, 1);
1594 return AVERROR(ENOMEM);
1596 *sd->data = s1->afd;
1600 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1601 ff_thread_finish_setup(avctx);
1602 } else { // second field
1605 if (!s->current_picture_ptr) {
1606 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1607 return AVERROR_INVALIDDATA;
1610 if (s->avctx->hwaccel &&
1611 (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1612 if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1613 av_log(avctx, AV_LOG_ERROR,
1614 "hardware accelerator failed to decode first field\n");
1617 for (i = 0; i < 4; i++) {
1618 s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1619 if (s->picture_structure == PICT_BOTTOM_FIELD)
1620 s->current_picture.f->data[i] +=
1621 s->current_picture_ptr->f->linesize[i];
1625 if (avctx->hwaccel) {
1626 if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1633 #define DECODE_SLICE_ERROR -1
1634 #define DECODE_SLICE_OK 0
1638 * MpegEncContext.mb_y must be set to the MB row from the startcode.
1639 * @return DECODE_SLICE_ERROR if the slice is damaged,
1640 * DECODE_SLICE_OK if this slice is OK
1642 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1643 const uint8_t **buf, int buf_size)
1645 AVCodecContext *avctx = s->avctx;
1646 const int field_pic = s->picture_structure != PICT_FRAME;
1650 s->resync_mb_y = -1;
1652 assert(mb_y < s->mb_height);
1654 init_get_bits(&s->gb, *buf, buf_size * 8);
1656 ff_mpeg1_clean_buffers(s);
1657 s->interlaced_dct = 0;
1659 s->qscale = get_qscale(s);
1661 if (s->qscale == 0) {
1662 av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1663 return AVERROR_INVALIDDATA;
1666 /* extra slice info */
1667 while (get_bits1(&s->gb) != 0)
1668 skip_bits(&s->gb, 8);
1672 if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1675 while (get_bits_left(&s->gb) > 0) {
1676 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1677 MBINCR_VLC_BITS, 2);
1679 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1680 return AVERROR_INVALIDDATA;
1685 /* otherwise, stuffing, nothing to do */
1693 if (s->mb_x >= (unsigned) s->mb_width) {
1694 av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1695 return AVERROR_INVALIDDATA;
1698 if (avctx->hwaccel) {
1699 const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1700 int start_code = -1;
1701 buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1702 if (buf_end < *buf + buf_size)
1705 if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1706 return DECODE_SLICE_ERROR;
1708 return DECODE_SLICE_OK;
1711 s->resync_mb_x = s->mb_x;
1712 s->resync_mb_y = s->mb_y = mb_y;
1714 ff_init_block_index(s);
1716 if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1717 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1718 av_log(s->avctx, AV_LOG_DEBUG,
1719 "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",
1721 s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1722 s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1723 s->pict_type == AV_PICTURE_TYPE_I ? "I" :
1724 (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1725 (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1726 s->progressive_sequence ? "ps" : "",
1727 s->progressive_frame ? "pf" : "",
1728 s->alternate_scan ? "alt" : "",
1729 s->top_field_first ? "top" : "",
1730 s->intra_dc_precision, s->picture_structure,
1731 s->frame_pred_frame_dct, s->concealment_motion_vectors,
1732 s->q_scale_type, s->intra_vlc_format,
1733 s->repeat_first_field, s->chroma_420_type ? "420" : "");
1738 if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1741 // Note motion_val is normally NULL unless we want to extract the MVs.
1742 if (s->current_picture.motion_val[0] && !s->encoding) {
1743 const int wrap = s->b8_stride;
1744 int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1745 int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1746 int motion_x, motion_y, dir, i;
1748 for (i = 0; i < 2; i++) {
1749 for (dir = 0; dir < 2; dir++) {
1751 (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1752 motion_x = motion_y = 0;
1753 } else if (s->mv_type == MV_TYPE_16X16 ||
1754 (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1755 motion_x = s->mv[dir][0][0];
1756 motion_y = s->mv[dir][0][1];
1757 } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1758 motion_x = s->mv[dir][i][0];
1759 motion_y = s->mv[dir][i][1];
1762 s->current_picture.motion_val[dir][xy][0] = motion_x;
1763 s->current_picture.motion_val[dir][xy][1] = motion_y;
1764 s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1765 s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1766 s->current_picture.ref_index [dir][b8_xy] =
1767 s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1768 assert(s->field_select[dir][i] == 0 ||
1769 s->field_select[dir][i] == 1);
1777 s->dest[1] += 16 >> s->chroma_x_shift;
1778 s->dest[2] += 16 >> s->chroma_x_shift;
1780 ff_mpv_decode_mb(s, s->block);
1782 if (++s->mb_x >= s->mb_width) {
1783 const int mb_size = 16;
1785 ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1786 ff_mpv_report_decode_progress(s);
1789 s->mb_y += 1 << field_pic;
1791 if (s->mb_y >= s->mb_height) {
1792 int left = get_bits_left(&s->gb);
1793 int is_d10 = s->chroma_format == 2 &&
1794 s->pict_type == AV_PICTURE_TYPE_I &&
1795 avctx->profile == 0 && avctx->level == 5 &&
1796 s->intra_dc_precision == 2 &&
1797 s->q_scale_type == 1 && s->alternate_scan == 0 &&
1798 s->progressive_frame == 0
1799 /* vbv_delay == 0xBBB || 0xE10 */;
1802 (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1803 ((avctx->err_recognition & AV_EF_BUFFER) && left > 8)) {
1804 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
1805 left, show_bits(&s->gb, FFMIN(left, 23)));
1806 return AVERROR_INVALIDDATA;
1811 ff_init_block_index(s);
1814 /* skip mb handling */
1815 if (s->mb_skip_run == -1) {
1816 /* read increment again */
1819 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1820 MBINCR_VLC_BITS, 2);
1822 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1823 return AVERROR_INVALIDDATA;
1827 s->mb_skip_run += 33;
1828 } else if (code == 35) {
1829 if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1830 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1831 return AVERROR_INVALIDDATA;
1833 goto eos; /* end of slice */
1835 /* otherwise, stuffing, nothing to do */
1837 s->mb_skip_run += code;
1841 if (s->mb_skip_run) {
1843 if (s->pict_type == AV_PICTURE_TYPE_I) {
1844 av_log(s->avctx, AV_LOG_ERROR,
1845 "skipped MB in I-frame at %d %d\n", s->mb_x, s->mb_y);
1846 return AVERROR_INVALIDDATA;
1851 for (i = 0; i < 12; i++)
1852 s->block_last_index[i] = -1;
1853 if (s->picture_structure == PICT_FRAME)
1854 s->mv_type = MV_TYPE_16X16;
1856 s->mv_type = MV_TYPE_FIELD;
1857 if (s->pict_type == AV_PICTURE_TYPE_P) {
1858 /* if P type, zero motion vector is implied */
1859 s->mv_dir = MV_DIR_FORWARD;
1860 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1861 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1862 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1863 s->field_select[0][0] = (s->picture_structure - 1) & 1;
1865 /* if B type, reuse previous vectors and directions */
1866 s->mv[0][0][0] = s->last_mv[0][0][0];
1867 s->mv[0][0][1] = s->last_mv[0][0][1];
1868 s->mv[1][0][0] = s->last_mv[1][0][0];
1869 s->mv[1][0][1] = s->last_mv[1][0][1];
1874 eos: // end of slice
1875 *buf += (get_bits_count(&s->gb) - 1) / 8;
1876 ff_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1880 static int slice_decode_thread(AVCodecContext *c, void *arg)
1882 MpegEncContext *s = *(void **) arg;
1883 const uint8_t *buf = s->gb.buffer;
1884 int mb_y = s->start_mb_y;
1885 const int field_pic = s->picture_structure != PICT_FRAME;
1887 s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1890 uint32_t start_code;
1893 ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1895 ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1896 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1897 s->start_mb_y, s->end_mb_y, s->er.error_count);
1899 if (c->err_recognition & AV_EF_EXPLODE)
1901 if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1902 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1904 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
1906 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1907 s->mb_x - 1, s->mb_y,
1908 ER_AC_END | ER_DC_END | ER_MV_END);
1911 if (s->mb_y == s->end_mb_y)
1915 buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
1916 mb_y = (start_code - SLICE_MIN_START_CODE) << field_pic;
1917 if (s->picture_structure == PICT_BOTTOM_FIELD)
1919 if (mb_y < 0 || mb_y >= s->end_mb_y)
1920 return AVERROR_INVALIDDATA;
1925 * Handle slice ends.
1926 * @return 1 if it seems to be the last slice
1928 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1930 Mpeg1Context *s1 = avctx->priv_data;
1931 MpegEncContext *s = &s1->mpeg_enc_ctx;
1933 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1936 if (s->avctx->hwaccel) {
1937 if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1938 av_log(avctx, AV_LOG_ERROR,
1939 "hardware accelerator failed to decode picture\n");
1942 /* end of slice reached */
1943 if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field) {
1946 ff_er_frame_end(&s->er);
1948 ff_mpv_frame_end(s);
1950 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
1951 int ret = av_frame_ref(pict, s->current_picture_ptr->f);
1954 ff_print_debug_info(s, s->current_picture_ptr);
1956 if (avctx->active_thread_type & FF_THREAD_FRAME)
1957 s->picture_number++;
1958 /* latency of 1 frame for I- and P-frames */
1959 /* XXX: use another variable than picture_number */
1960 if (s->last_picture_ptr) {
1961 int ret = av_frame_ref(pict, s->last_picture_ptr->f);
1964 ff_print_debug_info(s, s->last_picture_ptr);
1974 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1975 const uint8_t *buf, int buf_size)
1977 Mpeg1Context *s1 = avctx->priv_data;
1978 MpegEncContext *s = &s1->mpeg_enc_ctx;
1982 init_get_bits(&s->gb, buf, buf_size * 8);
1984 width = get_bits(&s->gb, 12);
1985 height = get_bits(&s->gb, 12);
1986 if (width == 0 || height == 0) {
1987 av_log(avctx, AV_LOG_WARNING,
1988 "Invalid horizontal or vertical size value.\n");
1989 if (avctx->err_recognition & AV_EF_BITSTREAM)
1990 return AVERROR_INVALIDDATA;
1992 s->aspect_ratio_info = get_bits(&s->gb, 4);
1993 if (s->aspect_ratio_info == 0) {
1994 av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1995 if (avctx->err_recognition & AV_EF_BITSTREAM)
1996 return AVERROR_INVALIDDATA;
1998 s->frame_rate_index = get_bits(&s->gb, 4);
1999 if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2000 av_log(avctx, AV_LOG_WARNING,
2001 "frame_rate_index %d is invalid\n", s->frame_rate_index);
2002 return AVERROR_INVALIDDATA;
2004 s->bit_rate = get_bits(&s->gb, 18) * 400;
2005 if (get_bits1(&s->gb) == 0) { /* marker */
2006 av_log(avctx, AV_LOG_ERROR, "Marker in sequence header missing\n");
2007 return AVERROR_INVALIDDATA;
2012 s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2013 skip_bits(&s->gb, 1);
2016 if (get_bits1(&s->gb)) {
2017 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2019 for (i = 0; i < 64; i++) {
2020 j = s->idsp.idct_permutation[i];
2021 v = ff_mpeg1_default_intra_matrix[i];
2022 s->intra_matrix[j] = v;
2023 s->chroma_intra_matrix[j] = v;
2026 if (get_bits1(&s->gb)) {
2027 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2029 for (i = 0; i < 64; i++) {
2030 int j = s->idsp.idct_permutation[i];
2031 v = ff_mpeg1_default_non_intra_matrix[i];
2032 s->inter_matrix[j] = v;
2033 s->chroma_inter_matrix[j] = v;
2037 if (show_bits(&s->gb, 23) != 0) {
2038 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2039 return AVERROR_INVALIDDATA;
2042 /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2043 s->progressive_sequence = 1;
2044 s->progressive_frame = 1;
2045 s->picture_structure = PICT_FRAME;
2046 s->frame_pred_frame_dct = 1;
2047 s->chroma_format = 1;
2049 s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2050 s->out_format = FMT_MPEG1;
2051 if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2054 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2055 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2056 s->avctx->rc_buffer_size, s->bit_rate);
2061 static int vcr2_init_sequence(AVCodecContext *avctx)
2063 Mpeg1Context *s1 = avctx->priv_data;
2064 MpegEncContext *s = &s1->mpeg_enc_ctx;
2067 /* start new MPEG-1 context decoding */
2068 s->out_format = FMT_MPEG1;
2069 if (s1->mpeg_enc_ctx_allocated) {
2070 ff_mpv_common_end(s);
2072 s->width = avctx->coded_width;
2073 s->height = avctx->coded_height;
2074 avctx->has_b_frames = 0; // true?
2077 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2079 if (avctx->hwaccel && avctx->idct_algo == FF_IDCT_AUTO)
2080 avctx->idct_algo = FF_IDCT_SIMPLE;
2082 ff_mpv_idct_init(s);
2083 if ((ret = ff_mpv_common_init(s)) < 0)
2085 s1->mpeg_enc_ctx_allocated = 1;
2087 for (i = 0; i < 64; i++) {
2088 int j = s->idsp.idct_permutation[i];
2089 v = ff_mpeg1_default_intra_matrix[i];
2090 s->intra_matrix[j] = v;
2091 s->chroma_intra_matrix[j] = v;
2093 v = ff_mpeg1_default_non_intra_matrix[i];
2094 s->inter_matrix[j] = v;
2095 s->chroma_inter_matrix[j] = v;
2098 s->progressive_sequence = 1;
2099 s->progressive_frame = 1;
2100 s->picture_structure = PICT_FRAME;
2101 s->frame_pred_frame_dct = 1;
2102 s->chroma_format = 1;
2103 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2104 s1->save_width = s->width;
2105 s1->save_height = s->height;
2106 s1->save_progressive_seq = s->progressive_sequence;
2110 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2111 const uint8_t *p, int buf_size)
2113 Mpeg1Context *s1 = avctx->priv_data;
2115 if (buf_size >= 6 &&
2116 p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2117 p[4] == 3 && (p[5] & 0x40)) {
2118 /* extract A53 Part 4 CC data */
2119 int cc_count = p[5] & 0x1f;
2120 if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2121 av_freep(&s1->a53_caption);
2122 s1->a53_caption_size = cc_count * 3;
2123 s1->a53_caption = av_malloc(s1->a53_caption_size);
2124 if (s1->a53_caption)
2125 memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2128 } else if (buf_size >= 11 &&
2129 p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2130 /* extract DVD CC data */
2133 // There is a caption count field in the data, but it is often
2134 // incorrect. So count the number of captions present.
2135 for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2137 // Transform the DVD format into A53 Part 4 format
2139 av_freep(&s1->a53_caption);
2140 s1->a53_caption_size = cc_count * 6;
2141 s1->a53_caption = av_malloc(s1->a53_caption_size);
2142 if (s1->a53_caption) {
2143 uint8_t field1 = !!(p[4] & 0x80);
2144 uint8_t *cap = s1->a53_caption;
2146 for (i = 0; i < cc_count; i++) {
2147 cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2150 cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2163 static void mpeg_decode_user_data(AVCodecContext *avctx,
2164 const uint8_t *p, int buf_size)
2166 const uint8_t *buf_end = p + buf_size;
2167 Mpeg1Context *s1 = avctx->priv_data;
2169 /* we parse the DTG active format information */
2170 if (buf_end - p >= 5 &&
2171 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2179 if (buf_end - p < 1)
2182 s1->afd = p[0] & 0x0f;
2184 } else if (buf_end - p >= 6 &&
2185 p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2186 p[4] == 0x03) { // S3D_video_format_length
2187 // the 0x7F mask ignores the reserved_bit value
2188 const uint8_t S3D_video_format_type = p[5] & 0x7F;
2190 if (S3D_video_format_type == 0x03 ||
2191 S3D_video_format_type == 0x04 ||
2192 S3D_video_format_type == 0x08 ||
2193 S3D_video_format_type == 0x23) {
2195 s1->has_stereo3d = 1;
2197 switch (S3D_video_format_type) {
2199 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2202 s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2205 s1->stereo3d.type = AV_STEREO3D_2D;
2208 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2212 } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2217 static void mpeg_decode_gop(AVCodecContext *avctx,
2218 const uint8_t *buf, int buf_size)
2220 Mpeg1Context *s1 = avctx->priv_data;
2221 MpegEncContext *s = &s1->mpeg_enc_ctx;
2223 int time_code_hours, time_code_minutes;
2224 int time_code_seconds, time_code_pictures;
2227 init_get_bits(&s->gb, buf, buf_size * 8);
2229 skip_bits1(&s->gb); /* drop_frame_flag */
2231 time_code_hours = get_bits(&s->gb, 5);
2232 time_code_minutes = get_bits(&s->gb, 6);
2233 skip_bits1(&s->gb); // marker bit
2234 time_code_seconds = get_bits(&s->gb, 6);
2235 time_code_pictures = get_bits(&s->gb, 6);
2237 s1->closed_gop = get_bits1(&s->gb);
2238 /* broken_link indicate that after editing the
2239 * reference frames of the first B-Frames after GOP I-Frame
2240 * are missing (open gop) */
2241 broken_link = get_bits1(&s->gb);
2243 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2244 av_log(s->avctx, AV_LOG_DEBUG,
2245 "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2246 time_code_hours, time_code_minutes, time_code_seconds,
2247 time_code_pictures, s1->closed_gop, broken_link);
2250 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2251 int *got_output, const uint8_t *buf, int buf_size)
2253 Mpeg1Context *s = avctx->priv_data;
2254 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2255 const uint8_t *buf_ptr = buf;
2256 const uint8_t *buf_end = buf + buf_size;
2257 int ret, input_size;
2258 int last_code = 0, skip_frame = 0;
2261 /* find next start code */
2262 uint32_t start_code = -1;
2263 buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2264 if (start_code > 0x1ff) {
2267 (avctx->active_thread_type & FF_THREAD_SLICE) &&
2271 avctx->execute(avctx, slice_decode_thread,
2272 &s2->thread_context[0], NULL,
2273 s->slice_count, sizeof(void *));
2274 for (i = 0; i < s->slice_count; i++)
2275 s2->er.error_count += s2->thread_context[i]->er.error_count;
2278 ret = slice_end(avctx, picture);
2282 // FIXME: merge with the stuff in mpeg_decode_slice
2283 if (s2->last_picture_ptr || s2->low_delay)
2288 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2291 input_size = buf_end - buf_ptr;
2293 if (avctx->debug & FF_DEBUG_STARTCODE)
2294 av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %td left %d\n",
2295 start_code, buf_ptr - buf, input_size);
2297 /* prepare data for next start code */
2298 switch (start_code) {
2299 case SEQ_START_CODE:
2300 if (last_code == 0) {
2301 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2304 av_log(avctx, AV_LOG_ERROR,
2305 "ignoring SEQ_START_CODE after %X\n", last_code);
2306 if (avctx->err_recognition & AV_EF_EXPLODE)
2307 return AVERROR_INVALIDDATA;
2311 case PICTURE_START_CODE:
2312 if (s2->width <= 0 || s2->height <= 0) {
2313 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2314 s2->width, s2->height);
2315 return AVERROR_INVALIDDATA;
2318 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2319 !avctx->hwaccel && s->slice_count) {
2322 avctx->execute(avctx, slice_decode_thread,
2323 s2->thread_context, NULL,
2324 s->slice_count, sizeof(void *));
2325 for (i = 0; i < s->slice_count; i++)
2326 s2->er.error_count += s2->thread_context[i]->er.error_count;
2329 if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2330 ret = mpeg_decode_postinit(avctx);
2332 av_log(avctx, AV_LOG_ERROR,
2333 "mpeg_decode_postinit() failure\n");
2337 /* We have a complete image: we try to decompress it. */
2338 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2341 last_code = PICTURE_START_CODE;
2343 av_log(avctx, AV_LOG_ERROR,
2344 "ignoring pic after %X\n", last_code);
2345 if (avctx->err_recognition & AV_EF_EXPLODE)
2346 return AVERROR_INVALIDDATA;
2349 case EXT_START_CODE:
2350 init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2352 switch (get_bits(&s2->gb, 4)) {
2354 if (last_code == 0) {
2355 mpeg_decode_sequence_extension(s);
2357 av_log(avctx, AV_LOG_ERROR,
2358 "ignoring seq ext after %X\n", last_code);
2359 if (avctx->err_recognition & AV_EF_EXPLODE)
2360 return AVERROR_INVALIDDATA;
2364 mpeg_decode_sequence_display_extension(s);
2367 mpeg_decode_quant_matrix_extension(s2);
2370 mpeg_decode_picture_display_extension(s);
2373 if (last_code == PICTURE_START_CODE) {
2374 mpeg_decode_picture_coding_extension(s);
2376 av_log(avctx, AV_LOG_ERROR,
2377 "ignoring pic cod ext after %X\n", last_code);
2378 if (avctx->err_recognition & AV_EF_EXPLODE)
2379 return AVERROR_INVALIDDATA;
2384 case USER_START_CODE:
2385 mpeg_decode_user_data(avctx, buf_ptr, input_size);
2387 case GOP_START_CODE:
2388 if (last_code == 0) {
2389 s2->first_field = 0;
2390 mpeg_decode_gop(avctx, buf_ptr, input_size);
2393 av_log(avctx, AV_LOG_ERROR,
2394 "ignoring GOP_START_CODE after %X\n", last_code);
2395 if (avctx->err_recognition & AV_EF_EXPLODE)
2396 return AVERROR_INVALIDDATA;
2400 if (start_code >= SLICE_MIN_START_CODE &&
2401 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2402 const int field_pic = s2->picture_structure != PICT_FRAME;
2403 int mb_y = (start_code - SLICE_MIN_START_CODE) << field_pic;
2404 last_code = SLICE_MIN_START_CODE;
2406 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2409 if (mb_y >= s2->mb_height) {
2410 av_log(s2->avctx, AV_LOG_ERROR,
2411 "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2412 return AVERROR_INVALIDDATA;
2415 if (!s2->last_picture_ptr) {
2416 /* Skip B-frames if we do not have reference frames and
2417 * GOP is not closed. */
2418 if (s2->pict_type == AV_PICTURE_TYPE_B) {
2419 if (!s->closed_gop) {
2425 if (s2->pict_type == AV_PICTURE_TYPE_I)
2427 if (!s2->next_picture_ptr) {
2428 /* Skip P-frames if we do not have a reference frame or
2429 * we have an invalid header. */
2430 if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2435 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2436 s2->pict_type == AV_PICTURE_TYPE_B) ||
2437 (avctx->skip_frame >= AVDISCARD_NONKEY &&
2438 s2->pict_type != AV_PICTURE_TYPE_I) ||
2439 avctx->skip_frame >= AVDISCARD_ALL) {
2444 if (!s->mpeg_enc_ctx_allocated)
2447 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2448 if (mb_y < avctx->skip_top ||
2449 mb_y >= s2->mb_height - avctx->skip_bottom)
2453 if (!s2->pict_type) {
2454 av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2455 if (avctx->err_recognition & AV_EF_EXPLODE)
2456 return AVERROR_INVALIDDATA;
2460 if (s->first_slice) {
2463 if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2466 if (!s2->current_picture_ptr) {
2467 av_log(avctx, AV_LOG_ERROR,
2468 "current_picture not initialized\n");
2469 return AVERROR_INVALIDDATA;
2473 (avctx->active_thread_type & FF_THREAD_SLICE) &&
2475 int threshold = (s2->mb_height * s->slice_count +
2476 s2->slice_context_count / 2) /
2477 s2->slice_context_count;
2478 if (threshold <= mb_y) {
2479 MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2481 thread_context->start_mb_y = mb_y;
2482 thread_context->end_mb_y = s2->mb_height;
2483 if (s->slice_count) {
2484 s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2485 ret = ff_update_duplicate_context(thread_context, s2);
2489 init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2492 buf_ptr += 2; // FIXME add minimum number of bytes per slice
2494 ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2498 if (avctx->err_recognition & AV_EF_EXPLODE)
2500 if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2501 ff_er_add_slice(&s2->er, s2->resync_mb_x,
2502 s2->resync_mb_y, s2->mb_x, s2->mb_y,
2503 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2505 ff_er_add_slice(&s2->er, s2->resync_mb_x,
2506 s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2507 ER_AC_END | ER_DC_END | ER_MV_END);
2516 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2517 int *got_output, AVPacket *avpkt)
2519 const uint8_t *buf = avpkt->data;
2520 int buf_size = avpkt->size;
2521 Mpeg1Context *s = avctx->priv_data;
2522 AVFrame *picture = data;
2523 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2524 ff_dlog(avctx, "fill_buffer\n");
2526 if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2527 /* special case for last picture */
2528 if (s2->low_delay == 0 && s2->next_picture_ptr) {
2529 int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2533 s2->next_picture_ptr = NULL;
2540 if (s2->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
2541 int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2544 if (ff_combine_frame(&s2->parse_context, next,
2545 (const uint8_t **) &buf, &buf_size) < 0)
2549 if (s->mpeg_enc_ctx_allocated == 0 && avctx->codec_tag == AV_RL32("VCR2"))
2550 vcr2_init_sequence(avctx);
2554 if (avctx->extradata && !s->extradata_decoded) {
2555 int ret = decode_chunks(avctx, picture, got_output,
2556 avctx->extradata, avctx->extradata_size);
2557 s->extradata_decoded = 1;
2558 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
2562 return decode_chunks(avctx, picture, got_output, buf, buf_size);
2565 static void flush(AVCodecContext *avctx)
2567 Mpeg1Context *s = avctx->priv_data;
2572 ff_mpeg_flush(avctx);
2575 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2577 Mpeg1Context *s = avctx->priv_data;
2579 if (s->mpeg_enc_ctx_allocated)
2580 ff_mpv_common_end(&s->mpeg_enc_ctx);
2581 av_freep(&s->a53_caption);
2585 AVCodec ff_mpeg1video_decoder = {
2586 .name = "mpeg1video",
2587 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2588 .type = AVMEDIA_TYPE_VIDEO,
2589 .id = AV_CODEC_ID_MPEG1VIDEO,
2590 .priv_data_size = sizeof(Mpeg1Context),
2591 .init = mpeg_decode_init,
2592 .close = mpeg_decode_end,
2593 .decode = mpeg_decode_frame,
2594 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2595 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2596 AV_CODEC_CAP_SLICE_THREADS,
2598 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context),
2599 .hw_configs = (const AVCodecHWConfigInternal*[]) {
2600 #if CONFIG_MPEG1_VDPAU_HWACCEL
2601 HWACCEL_VDPAU(mpeg1),
2607 AVCodec ff_mpeg2video_decoder = {
2608 .name = "mpeg2video",
2609 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2610 .type = AVMEDIA_TYPE_VIDEO,
2611 .id = AV_CODEC_ID_MPEG2VIDEO,
2612 .priv_data_size = sizeof(Mpeg1Context),
2613 .init = mpeg_decode_init,
2614 .close = mpeg_decode_end,
2615 .decode = mpeg_decode_frame,
2616 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2617 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2618 AV_CODEC_CAP_SLICE_THREADS,
2620 .profiles = NULL_IF_CONFIG_SMALL(ff_mpeg2_video_profiles),
2621 .hw_configs = (const AVCodecHWConfigInternal*[]) {
2622 #if CONFIG_MPEG2_DXVA2_HWACCEL
2623 HWACCEL_DXVA2(mpeg2),
2625 #if CONFIG_MPEG2_D3D11VA_HWACCEL
2626 HWACCEL_D3D11VA(mpeg2),
2628 #if CONFIG_MPEG2_D3D11VA2_HWACCEL
2629 HWACCEL_D3D11VA2(mpeg2),
2631 #if CONFIG_MPEG2_VAAPI_HWACCEL
2632 HWACCEL_VAAPI(mpeg2),
2634 #if CONFIG_MPEG2_VDPAU_HWACCEL
2635 HWACCEL_VDPAU(mpeg2),