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
29 #include "libavutil/internal.h"
33 #include "mpegvideo.h"
34 #include "error_resilience.h"
36 #include "mpeg12data.h"
37 #include "mpeg12decdata.h"
38 #include "bytestream.h"
39 #include "vdpau_internal.h"
40 #include "xvmc_internal.h"
46 typedef struct Mpeg1Context {
47 MpegEncContext mpeg_enc_ctx;
48 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
49 int repeat_field; /* true if we must repeat the field */
50 AVPanScan pan_scan; /**< some temporary storage for the panscan */
52 int swap_uv;//indicate VCR2
54 int save_width, save_height, save_progressive_seq;
55 AVRational frame_rate_ext; ///< MPEG-2 specific framerate modificator
56 int sync; ///< Did we reach a sync point like a GOP/SEQ/KEYFrame?
57 int closed_gop; ///< GOP is closed
58 int extradata_decoded;
61 /* as H.263, but only 17 codes */
62 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
64 int code, sign, val, shift;
66 code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
74 sign = get_bits1(&s->gb);
78 val = (val - 1) << shift;
79 val |= get_bits(&s->gb, shift);
87 return sign_extend(val, 5 + shift);
90 static inline int mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
92 int level, dc, diff, i, j, run;
94 RLTable *rl = &ff_rl_mpeg1;
95 uint8_t * const scantable = s->intra_scantable.permutated;
96 const uint16_t *quant_matrix = s->intra_matrix;
97 const int qscale = s->qscale;
100 component = (n <= 3 ? 0 : n - 4 + 1);
101 diff = decode_dc(&s->gb, component);
104 dc = s->last_dc[component];
106 s->last_dc[component] = dc;
107 block[0] = dc * quant_matrix[0];
108 av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
111 OPEN_READER(re, &s->gb);
112 /* now quantify & encode AC coefficients */
114 UPDATE_CACHE(re, &s->gb);
115 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
119 } else if (level != 0) {
122 level = (level * qscale * quant_matrix[j]) >> 4;
123 level = (level - 1) | 1;
124 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
125 LAST_SKIP_BITS(re, &s->gb, 1);
128 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
129 UPDATE_CACHE(re, &s->gb);
130 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
132 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
133 } else if (level == 0) {
134 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
140 level = (level * qscale * quant_matrix[j]) >> 4;
141 level = (level - 1) | 1;
144 level = (level * qscale * quant_matrix[j]) >> 4;
145 level = (level - 1) | 1;
149 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
155 CLOSE_READER(re, &s->gb);
157 s->block_last_index[n] = i;
161 int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
163 return mpeg1_decode_block_intra(s, block, n);
166 static inline int mpeg1_decode_block_inter(MpegEncContext *s, int16_t *block, int n)
168 int level, i, j, run;
169 RLTable *rl = &ff_rl_mpeg1;
170 uint8_t * const scantable = s->intra_scantable.permutated;
171 const uint16_t *quant_matrix = s->inter_matrix;
172 const int qscale = s->qscale;
175 OPEN_READER(re, &s->gb);
177 // special case for first coefficient, no need to add second VLC table
178 UPDATE_CACHE(re, &s->gb);
179 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
180 level = (3 * qscale * quant_matrix[0]) >> 5;
181 level = (level - 1) | 1;
182 if (GET_CACHE(re, &s->gb) & 0x40000000)
186 SKIP_BITS(re, &s->gb, 2);
187 if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
190 /* now quantify & encode AC coefficients */
192 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
197 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
198 level = (level - 1) | 1;
199 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
200 SKIP_BITS(re, &s->gb, 1);
203 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
204 UPDATE_CACHE(re, &s->gb);
205 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
207 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
208 } else if (level == 0) {
209 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
215 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
216 level = (level - 1) | 1;
219 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
220 level = (level - 1) | 1;
224 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
229 if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
231 UPDATE_CACHE(re, &s->gb);
234 LAST_SKIP_BITS(re, &s->gb, 2);
235 CLOSE_READER(re, &s->gb);
237 s->block_last_index[n] = i;
241 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, int16_t *block, int n)
243 int level, i, j, run;
244 RLTable *rl = &ff_rl_mpeg1;
245 uint8_t * const scantable = s->intra_scantable.permutated;
246 const int qscale = s->qscale;
249 OPEN_READER(re, &s->gb);
251 // special case for first coefficient, no need to add second VLC table
252 UPDATE_CACHE(re, &s->gb);
253 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
254 level = (3 * qscale) >> 1;
255 level = (level - 1) | 1;
256 if (GET_CACHE(re, &s->gb) & 0x40000000)
260 SKIP_BITS(re, &s->gb, 2);
261 if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
265 /* now quantify & encode AC coefficients */
267 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
272 level = ((level * 2 + 1) * qscale) >> 1;
273 level = (level - 1) | 1;
274 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
275 SKIP_BITS(re, &s->gb, 1);
278 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
279 UPDATE_CACHE(re, &s->gb);
280 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
282 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
283 } else if (level == 0) {
284 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
290 level = ((level * 2 + 1) * qscale) >> 1;
291 level = (level - 1) | 1;
294 level = ((level * 2 + 1) * qscale) >> 1;
295 level = (level - 1) | 1;
300 if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
302 UPDATE_CACHE(re, &s->gb);
305 LAST_SKIP_BITS(re, &s->gb, 2);
306 CLOSE_READER(re, &s->gb);
308 s->block_last_index[n] = i;
313 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, int16_t *block, int n)
315 int level, i, j, run;
316 RLTable *rl = &ff_rl_mpeg1;
317 uint8_t * const scantable = s->intra_scantable.permutated;
318 const uint16_t *quant_matrix;
319 const int qscale = s->qscale;
325 OPEN_READER(re, &s->gb);
328 quant_matrix = s->inter_matrix;
330 quant_matrix = s->chroma_inter_matrix;
332 // special case for first coefficient, no need to add second VLC table
333 UPDATE_CACHE(re, &s->gb);
334 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
335 level= (3 * qscale * quant_matrix[0]) >> 5;
336 if (GET_CACHE(re, &s->gb) & 0x40000000)
341 SKIP_BITS(re, &s->gb, 2);
342 if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
346 /* now quantify & encode AC coefficients */
348 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
353 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
354 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
355 SKIP_BITS(re, &s->gb, 1);
358 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
359 UPDATE_CACHE(re, &s->gb);
360 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
365 level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
368 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
372 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
378 if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
380 UPDATE_CACHE(re, &s->gb);
383 LAST_SKIP_BITS(re, &s->gb, 2);
384 CLOSE_READER(re, &s->gb);
386 block[63] ^= (mismatch & 1);
388 s->block_last_index[n] = i;
392 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
393 int16_t *block, int n)
395 int level, i, j, run;
396 RLTable *rl = &ff_rl_mpeg1;
397 uint8_t * const scantable = s->intra_scantable.permutated;
398 const int qscale = s->qscale;
399 OPEN_READER(re, &s->gb);
402 // special case for first coefficient, no need to add second VLC table
403 UPDATE_CACHE(re, &s->gb);
404 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
405 level = (3 * qscale) >> 1;
406 if (GET_CACHE(re, &s->gb) & 0x40000000)
410 SKIP_BITS(re, &s->gb, 2);
411 if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
415 /* now quantify & encode AC coefficients */
417 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
422 level = ((level * 2 + 1) * qscale) >> 1;
423 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
424 SKIP_BITS(re, &s->gb, 1);
427 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
428 UPDATE_CACHE(re, &s->gb);
429 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
434 level = ((-level * 2 + 1) * qscale) >> 1;
437 level = ((level * 2 + 1) * qscale) >> 1;
442 if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
444 UPDATE_CACHE(re, &s->gb);
447 LAST_SKIP_BITS(re, &s->gb, 2);
448 CLOSE_READER(re, &s->gb);
449 s->block_last_index[n] = i;
454 static inline int mpeg2_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
456 int level, dc, diff, i, j, run;
459 uint8_t * const scantable = s->intra_scantable.permutated;
460 const uint16_t *quant_matrix;
461 const int qscale = s->qscale;
466 quant_matrix = s->intra_matrix;
469 quant_matrix = s->chroma_intra_matrix;
470 component = (n & 1) + 1;
472 diff = decode_dc(&s->gb, component);
475 dc = s->last_dc[component];
477 s->last_dc[component] = dc;
478 block[0] = dc << (3 - s->intra_dc_precision);
479 av_dlog(s->avctx, "dc=%d\n", block[0]);
480 mismatch = block[0] ^ 1;
482 if (s->intra_vlc_format)
488 OPEN_READER(re, &s->gb);
489 /* now quantify & encode AC coefficients */
491 UPDATE_CACHE(re, &s->gb);
492 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
496 } else if (level != 0) {
499 level = (level * qscale * quant_matrix[j]) >> 4;
500 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
501 LAST_SKIP_BITS(re, &s->gb, 1);
504 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
505 UPDATE_CACHE(re, &s->gb);
506 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
510 level = (-level * qscale * quant_matrix[j]) >> 4;
513 level = (level * qscale * quant_matrix[j]) >> 4;
517 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
524 CLOSE_READER(re, &s->gb);
526 block[63] ^= mismatch & 1;
528 s->block_last_index[n] = i;
532 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
534 int level, dc, diff, j, run;
537 uint8_t * scantable = s->intra_scantable.permutated;
538 const uint16_t *quant_matrix;
539 const int qscale = s->qscale;
543 quant_matrix = s->intra_matrix;
546 quant_matrix = s->chroma_intra_matrix;
547 component = (n & 1) + 1;
549 diff = decode_dc(&s->gb, component);
552 dc = s->last_dc[component];
554 s->last_dc[component] = dc;
555 block[0] = dc << (3 - s->intra_dc_precision);
556 if (s->intra_vlc_format)
562 OPEN_READER(re, &s->gb);
563 /* now quantify & encode AC coefficients */
565 UPDATE_CACHE(re, &s->gb);
566 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
570 } else if (level != 0) {
573 level = (level * qscale * quant_matrix[j]) >> 4;
574 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
575 LAST_SKIP_BITS(re, &s->gb, 1);
578 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
579 UPDATE_CACHE(re, &s->gb);
580 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
584 level = (-level * qscale * quant_matrix[j]) >> 4;
587 level = (level * qscale * quant_matrix[j]) >> 4;
593 CLOSE_READER(re, &s->gb);
596 s->block_last_index[n] = scantable - s->intra_scantable.permutated;
600 /******************************************/
603 static inline int get_dmv(MpegEncContext *s)
605 if (get_bits1(&s->gb))
606 return 1 - (get_bits1(&s->gb) << 1);
611 static inline int get_qscale(MpegEncContext *s)
613 int qscale = get_bits(&s->gb, 5);
614 if (s->q_scale_type) {
615 return non_linear_qscale[qscale];
621 static void exchange_uv(MpegEncContext *s)
626 s->pblocks[4] = s->pblocks[5];
630 /* motion type (for MPEG-2) */
636 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
638 int i, j, k, cbp, val, mb_type, motion_type;
639 const int mb_block_count = 4 + (1 << s->chroma_format);
641 av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
643 assert(s->mb_skipped == 0);
645 if (s->mb_skip_run-- != 0) {
646 if (s->pict_type == AV_PICTURE_TYPE_P) {
648 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
653 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
655 mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1]; // FIXME not sure if this is allowed in MPEG at all
656 if (IS_INTRA(mb_type))
658 s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride] =
659 mb_type | MB_TYPE_SKIP;
660 // assert(s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1] & (MB_TYPE_16x16 | MB_TYPE_16x8));
662 if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
669 switch (s->pict_type) {
671 case AV_PICTURE_TYPE_I:
672 if (get_bits1(&s->gb) == 0) {
673 if (get_bits1(&s->gb) == 0) {
674 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
677 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
679 mb_type = MB_TYPE_INTRA;
682 case AV_PICTURE_TYPE_P:
683 mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
685 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
688 mb_type = ptype2mb_type[mb_type];
690 case AV_PICTURE_TYPE_B:
691 mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
693 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
696 mb_type = btype2mb_type[mb_type];
699 av_dlog(s->avctx, "mb_type=%x\n", mb_type);
700 // motion_type = 0; /* avoid warning */
701 if (IS_INTRA(mb_type)) {
702 s->dsp.clear_blocks(s->block[0]);
704 if (!s->chroma_y_shift) {
705 s->dsp.clear_blocks(s->block[6]);
708 /* compute DCT type */
709 if (s->picture_structure == PICT_FRAME && // FIXME add an interlaced_dct coded var?
710 !s->frame_pred_frame_dct) {
711 s->interlaced_dct = get_bits1(&s->gb);
714 if (IS_QUANT(mb_type))
715 s->qscale = get_qscale(s);
717 if (s->concealment_motion_vectors) {
718 /* just parse them */
719 if (s->picture_structure != PICT_FRAME)
720 skip_bits1(&s->gb); /* field select */
722 s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
723 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
724 s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
725 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
727 skip_bits1(&s->gb); /* marker */
729 memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
731 // if 1, we memcpy blocks in xvmcvideo
732 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
733 ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
739 if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
740 if (s->flags2 & CODEC_FLAG2_FAST) {
741 for (i = 0; i < 6; i++) {
742 mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
745 for (i = 0; i < mb_block_count; i++) {
746 if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
751 for (i = 0; i < 6; i++) {
752 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
757 if (mb_type & MB_TYPE_ZERO_MV) {
758 assert(mb_type & MB_TYPE_CBP);
760 s->mv_dir = MV_DIR_FORWARD;
761 if (s->picture_structure == PICT_FRAME) {
762 if (!s->frame_pred_frame_dct)
763 s->interlaced_dct = get_bits1(&s->gb);
764 s->mv_type = MV_TYPE_16X16;
766 s->mv_type = MV_TYPE_FIELD;
767 mb_type |= MB_TYPE_INTERLACED;
768 s->field_select[0][0] = s->picture_structure - 1;
771 if (IS_QUANT(mb_type))
772 s->qscale = get_qscale(s);
774 s->last_mv[0][0][0] = 0;
775 s->last_mv[0][0][1] = 0;
776 s->last_mv[0][1][0] = 0;
777 s->last_mv[0][1][1] = 0;
781 assert(mb_type & MB_TYPE_L0L1);
782 // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
783 /* get additional motion vector type */
784 if (s->frame_pred_frame_dct)
785 motion_type = MT_FRAME;
787 motion_type = get_bits(&s->gb, 2);
788 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
789 s->interlaced_dct = get_bits1(&s->gb);
792 if (IS_QUANT(mb_type))
793 s->qscale = get_qscale(s);
796 s->mv_dir = (mb_type >> 13) & 3;
797 av_dlog(s->avctx, "motion_type=%d\n", motion_type);
798 switch (motion_type) {
799 case MT_FRAME: /* or MT_16X8 */
800 if (s->picture_structure == PICT_FRAME) {
801 mb_type |= MB_TYPE_16x16;
802 s->mv_type = MV_TYPE_16X16;
803 for (i = 0; i < 2; i++) {
804 if (USES_LIST(mb_type, i)) {
806 s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
807 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
808 s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
809 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
810 /* full_pel: only for MPEG-1 */
811 if (s->full_pel[i]) {
812 s->mv[i][0][0] <<= 1;
813 s->mv[i][0][1] <<= 1;
818 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
819 s->mv_type = MV_TYPE_16X8;
820 for (i = 0; i < 2; i++) {
821 if (USES_LIST(mb_type, i)) {
823 for (j = 0; j < 2; j++) {
824 s->field_select[i][j] = get_bits1(&s->gb);
825 for (k = 0; k < 2; k++) {
826 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
827 s->last_mv[i][j][k]);
828 s->last_mv[i][j][k] = val;
829 s->mv[i][j][k] = val;
837 s->mv_type = MV_TYPE_FIELD;
838 if (s->picture_structure == PICT_FRAME) {
839 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
840 for (i = 0; i < 2; i++) {
841 if (USES_LIST(mb_type, i)) {
842 for (j = 0; j < 2; j++) {
843 s->field_select[i][j] = get_bits1(&s->gb);
844 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
845 s->last_mv[i][j][0]);
846 s->last_mv[i][j][0] = val;
847 s->mv[i][j][0] = val;
848 av_dlog(s->avctx, "fmx=%d\n", val);
849 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
850 s->last_mv[i][j][1] >> 1);
851 s->last_mv[i][j][1] = val << 1;
852 s->mv[i][j][1] = val;
853 av_dlog(s->avctx, "fmy=%d\n", val);
858 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
859 for (i = 0; i < 2; i++) {
860 if (USES_LIST(mb_type, i)) {
861 s->field_select[i][0] = get_bits1(&s->gb);
862 for (k = 0; k < 2; k++) {
863 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
864 s->last_mv[i][0][k]);
865 s->last_mv[i][0][k] = val;
866 s->last_mv[i][1][k] = val;
867 s->mv[i][0][k] = val;
874 s->mv_type = MV_TYPE_DMV;
875 for (i = 0; i < 2; i++) {
876 if (USES_LIST(mb_type, i)) {
877 int dmx, dmy, mx, my, m;
878 const int my_shift = s->picture_structure == PICT_FRAME;
880 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
881 s->last_mv[i][0][0]);
882 s->last_mv[i][0][0] = mx;
883 s->last_mv[i][1][0] = mx;
885 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
886 s->last_mv[i][0][1] >> my_shift);
890 s->last_mv[i][0][1] = my << my_shift;
891 s->last_mv[i][1][1] = my << my_shift;
895 s->mv[i][1][0] = mx; // not used
896 s->mv[i][1][1] = my; // not used
898 if (s->picture_structure == PICT_FRAME) {
899 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
901 // m = 1 + 2 * s->top_field_first;
902 m = s->top_field_first ? 1 : 3;
904 /* top -> top pred */
905 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
906 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
908 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
909 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
911 mb_type |= MB_TYPE_16x16;
913 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
914 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
915 if (s->picture_structure == PICT_TOP_FIELD)
924 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
930 if (HAS_CBP(mb_type)) {
931 s->dsp.clear_blocks(s->block[0]);
933 cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
934 if (mb_block_count > 6) {
935 cbp <<= mb_block_count - 6;
936 cbp |= get_bits(&s->gb, mb_block_count - 6);
937 s->dsp.clear_blocks(s->block[6]);
940 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
944 //if 1, we memcpy blocks in xvmcvideo
945 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
946 ff_xvmc_pack_pblocks(s, cbp);
952 if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
953 if (s->flags2 & CODEC_FLAG2_FAST) {
954 for (i = 0; i < 6; i++) {
956 mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
958 s->block_last_index[i] = -1;
963 cbp <<= 12-mb_block_count;
965 for (i = 0; i < mb_block_count; i++) {
966 if (cbp & (1 << 11)) {
967 if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
970 s->block_last_index[i] = -1;
976 if (s->flags2 & CODEC_FLAG2_FAST) {
977 for (i = 0; i < 6; i++) {
979 mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
981 s->block_last_index[i] = -1;
986 for (i = 0; i < 6; i++) {
988 if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
991 s->block_last_index[i] = -1;
998 for (i = 0; i < 12; i++)
999 s->block_last_index[i] = -1;
1003 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1008 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1010 Mpeg1Context *s = avctx->priv_data;
1011 MpegEncContext *s2 = &s->mpeg_enc_ctx;
1014 /* we need some permutation to store matrices,
1015 * until MPV_common_init() sets the real permutation. */
1016 for (i = 0; i < 64; i++)
1017 s2->dsp.idct_permutation[i]=i;
1019 ff_MPV_decode_defaults(s2);
1021 s->mpeg_enc_ctx.avctx = avctx;
1022 s->mpeg_enc_ctx.flags = avctx->flags;
1023 s->mpeg_enc_ctx.flags2 = avctx->flags2;
1024 ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1025 ff_mpeg12_init_vlcs();
1027 s->mpeg_enc_ctx_allocated = 0;
1028 s->mpeg_enc_ctx.picture_number = 0;
1029 s->repeat_field = 0;
1030 s->mpeg_enc_ctx.codec_id = avctx->codec->id;
1031 avctx->color_range = AVCOL_RANGE_MPEG;
1032 if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1033 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1035 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1039 static int mpeg_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
1041 Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1042 MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1045 if (avctx == avctx_from || !ctx_from->mpeg_enc_ctx_allocated || !s1->context_initialized)
1048 err = ff_mpeg_update_thread_context(avctx, avctx_from);
1049 if (err) return err;
1051 if (!ctx->mpeg_enc_ctx_allocated)
1052 memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1054 if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1055 s->picture_number++;
1060 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1061 const uint8_t *new_perm)
1063 uint16_t temp_matrix[64];
1066 memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1068 for (i = 0; i < 64; i++) {
1069 matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1073 static const enum AVPixelFormat pixfmt_xvmc_mpg2_420[] = {
1074 AV_PIX_FMT_XVMC_MPEG2_IDCT,
1075 AV_PIX_FMT_XVMC_MPEG2_MC,
1078 static const enum AVPixelFormat mpeg12_hwaccel_pixfmt_list_420[] = {
1079 #if CONFIG_MPEG2_DXVA2_HWACCEL
1080 AV_PIX_FMT_DXVA2_VLD,
1082 #if CONFIG_MPEG2_VAAPI_HWACCEL
1083 AV_PIX_FMT_VAAPI_VLD,
1085 #if CONFIG_MPEG1_VDPAU_HWACCEL | CONFIG_MPEG2_VDPAU_HWACCEL
1092 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1094 Mpeg1Context *s1 = avctx->priv_data;
1095 MpegEncContext *s = &s1->mpeg_enc_ctx;
1097 if (avctx->xvmc_acceleration)
1098 return avctx->get_format(avctx, pixfmt_xvmc_mpg2_420);
1099 else if (avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU) {
1100 if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO)
1101 return AV_PIX_FMT_VDPAU_MPEG1;
1103 return AV_PIX_FMT_VDPAU_MPEG2;
1105 if (s->chroma_format < 2)
1106 return avctx->get_format(avctx, mpeg12_hwaccel_pixfmt_list_420);
1107 else if (s->chroma_format == 2)
1108 return AV_PIX_FMT_YUV422P;
1110 return AV_PIX_FMT_YUV444P;
1114 /* Call this function when we know all parameters.
1115 * It may be called in different places for MPEG-1 and MPEG-2. */
1116 static int mpeg_decode_postinit(AVCodecContext *avctx)
1118 Mpeg1Context *s1 = avctx->priv_data;
1119 MpegEncContext *s = &s1->mpeg_enc_ctx;
1120 uint8_t old_permutation[64];
1122 if ((s1->mpeg_enc_ctx_allocated == 0) ||
1123 avctx->coded_width != s->width ||
1124 avctx->coded_height != s->height ||
1125 s1->save_width != s->width ||
1126 s1->save_height != s->height ||
1127 s1->save_aspect_info != s->aspect_ratio_info ||
1128 s1->save_progressive_seq != s->progressive_sequence ||
1132 if (s1->mpeg_enc_ctx_allocated) {
1133 ParseContext pc = s->parse_context;
1134 s->parse_context.buffer = 0;
1135 ff_MPV_common_end(s);
1136 s->parse_context = pc;
1139 if ((s->width == 0) || (s->height == 0))
1142 avcodec_set_dimensions(avctx, s->width, s->height);
1143 avctx->bit_rate = s->bit_rate;
1144 s1->save_aspect_info = s->aspect_ratio_info;
1145 s1->save_width = s->width;
1146 s1->save_height = s->height;
1147 s1->save_progressive_seq = s->progressive_sequence;
1149 /* low_delay may be forced, in this case we will have B-frames
1150 * that behave like P-frames. */
1151 avctx->has_b_frames = !s->low_delay;
1153 if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1155 avctx->time_base.den = ff_mpeg12_frame_rate_tab[s->frame_rate_index].num;
1156 avctx->time_base.num = ff_mpeg12_frame_rate_tab[s->frame_rate_index].den;
1158 avctx->sample_aspect_ratio = av_d2q(1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1159 avctx->ticks_per_frame=1;
1162 av_reduce(&s->avctx->time_base.den,
1163 &s->avctx->time_base.num,
1164 ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1165 ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1167 avctx->ticks_per_frame = 2;
1169 if (s->aspect_ratio_info > 1) {
1171 av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1172 (AVRational) {s1->pan_scan.width, s1->pan_scan.height}),
1173 (AVRational) {s->width, s->height});
1175 // we ignore the spec here and guess a bit as reality does not match the spec, see for example
1176 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1177 // issue1613, 621, 562
1178 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1179 (av_cmp_q(dar, (AVRational) {4, 3}) && av_cmp_q(dar, (AVRational) {16, 9}))) {
1180 s->avctx->sample_aspect_ratio =
1181 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1182 (AVRational) {s->width, s->height});
1184 s->avctx->sample_aspect_ratio =
1185 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1186 (AVRational) {s1->pan_scan.width, s1->pan_scan.height});
1187 //issue1613 4/3 16/9 -> 16/9
1188 //res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1189 //widescreen-issue562.mpg 4/3 16/9 -> 16/9
1190 // s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1191 av_dlog(avctx, "A %d/%d\n",
1192 ff_mpeg2_aspect[s->aspect_ratio_info].num, ff_mpeg2_aspect[s->aspect_ratio_info].den);
1193 av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1194 s->avctx->sample_aspect_ratio.den);
1197 s->avctx->sample_aspect_ratio =
1198 ff_mpeg2_aspect[s->aspect_ratio_info];
1202 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1203 avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1204 // until then pix_fmt may be changed right after codec init
1205 if (avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT ||
1207 s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)
1208 if (avctx->idct_algo == FF_IDCT_AUTO)
1209 avctx->idct_algo = FF_IDCT_SIMPLE;
1211 /* Quantization matrices may need reordering
1212 * if DCT permutation is changed. */
1213 memcpy(old_permutation, s->dsp.idct_permutation, 64 * sizeof(uint8_t));
1215 if (ff_MPV_common_init(s) < 0)
1218 quant_matrix_rebuild(s->intra_matrix, old_permutation, s->dsp.idct_permutation);
1219 quant_matrix_rebuild(s->inter_matrix, old_permutation, s->dsp.idct_permutation);
1220 quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->dsp.idct_permutation);
1221 quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->dsp.idct_permutation);
1223 s1->mpeg_enc_ctx_allocated = 1;
1228 static int mpeg1_decode_picture(AVCodecContext *avctx,
1229 const uint8_t *buf, int buf_size)
1231 Mpeg1Context *s1 = avctx->priv_data;
1232 MpegEncContext *s = &s1->mpeg_enc_ctx;
1233 int ref, f_code, vbv_delay;
1235 init_get_bits(&s->gb, buf, buf_size*8);
1237 ref = get_bits(&s->gb, 10); /* temporal ref */
1238 s->pict_type = get_bits(&s->gb, 3);
1239 if (s->pict_type == 0 || s->pict_type > 3)
1242 vbv_delay = get_bits(&s->gb, 16);
1243 if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
1244 s->full_pel[0] = get_bits1(&s->gb);
1245 f_code = get_bits(&s->gb, 3);
1246 if (f_code == 0 && (avctx->err_recognition & AV_EF_BITSTREAM))
1248 s->mpeg_f_code[0][0] = f_code;
1249 s->mpeg_f_code[0][1] = f_code;
1251 if (s->pict_type == AV_PICTURE_TYPE_B) {
1252 s->full_pel[1] = get_bits1(&s->gb);
1253 f_code = get_bits(&s->gb, 3);
1254 if (f_code == 0 && (avctx->err_recognition & AV_EF_BITSTREAM))
1256 s->mpeg_f_code[1][0] = f_code;
1257 s->mpeg_f_code[1][1] = f_code;
1259 s->current_picture.f.pict_type = s->pict_type;
1260 s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1262 if (avctx->debug & FF_DEBUG_PICT_INFO)
1263 av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1270 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1272 MpegEncContext *s= &s1->mpeg_enc_ctx;
1273 int horiz_size_ext, vert_size_ext;
1276 skip_bits(&s->gb, 1); /* profile and level esc*/
1277 s->avctx->profile = get_bits(&s->gb, 3);
1278 s->avctx->level = get_bits(&s->gb, 4);
1279 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1280 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1281 horiz_size_ext = get_bits(&s->gb, 2);
1282 vert_size_ext = get_bits(&s->gb, 2);
1283 s->width |= (horiz_size_ext << 12);
1284 s->height |= (vert_size_ext << 12);
1285 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1286 s->bit_rate += (bit_rate_ext << 18) * 400;
1287 skip_bits1(&s->gb); /* marker */
1288 s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1290 s->low_delay = get_bits1(&s->gb);
1291 if (s->flags & CODEC_FLAG_LOW_DELAY)
1294 s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1295 s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1297 av_dlog(s->avctx, "sequence extension\n");
1298 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1300 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1301 av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1302 s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1306 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1308 MpegEncContext *s = &s1->mpeg_enc_ctx;
1309 int color_description, w, h;
1311 skip_bits(&s->gb, 3); /* video format */
1312 color_description = get_bits1(&s->gb);
1313 if (color_description) {
1314 s->avctx->color_primaries = get_bits(&s->gb, 8);
1315 s->avctx->color_trc = get_bits(&s->gb, 8);
1316 s->avctx->colorspace = get_bits(&s->gb, 8);
1318 w = get_bits(&s->gb, 14);
1319 skip_bits(&s->gb, 1); //marker
1320 h = get_bits(&s->gb, 14);
1321 // remaining 3 bits are zero padding
1323 s1->pan_scan.width = 16 * w;
1324 s1->pan_scan.height = 16 * h;
1326 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1327 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1330 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1332 MpegEncContext *s = &s1->mpeg_enc_ctx;
1336 if (s->progressive_sequence) {
1337 if (s->repeat_first_field) {
1339 if (s->top_field_first)
1343 if (s->picture_structure == PICT_FRAME) {
1345 if (s->repeat_first_field)
1349 for (i = 0; i < nofco; i++) {
1350 s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1351 skip_bits(&s->gb, 1); // marker
1352 s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1353 skip_bits(&s->gb, 1); // marker
1356 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1357 av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1358 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1359 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1360 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1363 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra)
1367 for (i = 0; i < 64; i++) {
1368 int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1369 int v = get_bits(&s->gb, 8);
1371 av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1374 if (intra && i == 0 && v != 8) {
1375 av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
1376 v = 8; // needed by pink.mpg / issue1046
1385 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1387 av_dlog(s->avctx, "matrix extension\n");
1389 if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1390 if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1391 if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL , 1);
1392 if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL , 0);
1395 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1397 MpegEncContext *s = &s1->mpeg_enc_ctx;
1399 s->full_pel[0] = s->full_pel[1] = 0;
1400 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1401 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1402 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1403 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1404 if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1405 av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1406 if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1407 if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1408 s->pict_type = AV_PICTURE_TYPE_I;
1410 s->pict_type = AV_PICTURE_TYPE_P;
1412 s->pict_type = AV_PICTURE_TYPE_B;
1413 s->current_picture.f.pict_type = s->pict_type;
1414 s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1416 s->intra_dc_precision = get_bits(&s->gb, 2);
1417 s->picture_structure = get_bits(&s->gb, 2);
1418 s->top_field_first = get_bits1(&s->gb);
1419 s->frame_pred_frame_dct = get_bits1(&s->gb);
1420 s->concealment_motion_vectors = get_bits1(&s->gb);
1421 s->q_scale_type = get_bits1(&s->gb);
1422 s->intra_vlc_format = get_bits1(&s->gb);
1423 s->alternate_scan = get_bits1(&s->gb);
1424 s->repeat_first_field = get_bits1(&s->gb);
1425 s->chroma_420_type = get_bits1(&s->gb);
1426 s->progressive_frame = get_bits1(&s->gb);
1428 if (s->progressive_sequence && !s->progressive_frame) {
1429 s->progressive_frame = 1;
1430 av_log(s->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
1433 if (s->picture_structure == 0 || (s->progressive_frame && s->picture_structure != PICT_FRAME)) {
1434 av_log(s->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s->picture_structure);
1435 s->picture_structure = PICT_FRAME;
1438 if (s->progressive_sequence && !s->frame_pred_frame_dct) {
1439 av_log(s->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
1442 if (s->picture_structure == PICT_FRAME) {
1444 s->v_edge_pos = 16 * s->mb_height;
1446 s->first_field ^= 1;
1447 s->v_edge_pos = 8 * s->mb_height;
1448 memset(s->mbskip_table, 0, s->mb_stride * s->mb_height);
1451 if (s->alternate_scan) {
1452 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1453 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1455 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1456 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1459 /* composite display not parsed */
1460 av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1461 av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1462 av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1463 av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1464 av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1465 av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1466 av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1467 av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1468 av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1471 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1473 AVCodecContext *avctx = s->avctx;
1474 Mpeg1Context *s1 = (Mpeg1Context*)s;
1476 /* start frame decoding */
1477 if (s->first_field || s->picture_structure == PICT_FRAME) {
1478 AVFrameSideData *pan_scan;
1480 if (ff_MPV_frame_start(s, avctx) < 0)
1483 ff_mpeg_er_frame_start(s);
1485 /* first check if we must repeat the frame */
1486 s->current_picture_ptr->f.repeat_pict = 0;
1487 if (s->repeat_first_field) {
1488 if (s->progressive_sequence) {
1489 if (s->top_field_first)
1490 s->current_picture_ptr->f.repeat_pict = 4;
1492 s->current_picture_ptr->f.repeat_pict = 2;
1493 } else if (s->progressive_frame) {
1494 s->current_picture_ptr->f.repeat_pict = 1;
1498 pan_scan = av_frame_new_side_data(&s->current_picture_ptr->f,
1499 AV_FRAME_DATA_PANSCAN,
1500 sizeof(s1->pan_scan));
1502 return AVERROR(ENOMEM);
1503 memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1505 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1506 ff_thread_finish_setup(avctx);
1507 } else { // second field
1510 if (!s->current_picture_ptr) {
1511 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1515 if (s->avctx->hwaccel &&
1516 (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1517 if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1518 av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode first field\n");
1521 for (i = 0; i < 4; i++) {
1522 s->current_picture.f.data[i] = s->current_picture_ptr->f.data[i];
1523 if (s->picture_structure == PICT_BOTTOM_FIELD) {
1524 s->current_picture.f.data[i] += s->current_picture_ptr->f.linesize[i];
1529 if (avctx->hwaccel) {
1530 if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1534 // MPV_frame_start will call this function too,
1535 // but we need to call it on every field
1536 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1537 if (ff_xvmc_field_start(s, avctx) < 0)
1543 #define DECODE_SLICE_ERROR -1
1544 #define DECODE_SLICE_OK 0
1548 * MpegEncContext.mb_y must be set to the MB row from the startcode.
1549 * @return DECODE_SLICE_ERROR if the slice is damaged,
1550 * DECODE_SLICE_OK if this slice is OK
1552 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1553 const uint8_t **buf, int buf_size)
1555 AVCodecContext *avctx = s->avctx;
1556 const int field_pic = s->picture_structure != PICT_FRAME;
1559 s->resync_mb_y = -1;
1561 assert(mb_y < s->mb_height);
1563 init_get_bits(&s->gb, *buf, buf_size * 8);
1565 ff_mpeg1_clean_buffers(s);
1566 s->interlaced_dct = 0;
1568 s->qscale = get_qscale(s);
1570 if (s->qscale == 0) {
1571 av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1575 /* extra slice info */
1576 while (get_bits1(&s->gb) != 0) {
1577 skip_bits(&s->gb, 8);
1582 if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1585 while (get_bits_left(&s->gb) > 0) {
1586 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1587 MBINCR_VLC_BITS, 2);
1589 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1596 /* otherwise, stuffing, nothing to do */
1604 if (s->mb_x >= (unsigned)s->mb_width) {
1605 av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1609 if (avctx->hwaccel) {
1610 const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1611 int start_code = -1;
1612 buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1613 if (buf_end < *buf + buf_size)
1616 if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1617 return DECODE_SLICE_ERROR;
1619 return DECODE_SLICE_OK;
1622 s->resync_mb_x = s->mb_x;
1623 s->resync_mb_y = s->mb_y = mb_y;
1625 ff_init_block_index(s);
1627 if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1628 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1629 av_log(s->avctx, AV_LOG_DEBUG, "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",
1630 s->qscale, s->mpeg_f_code[0][0], s->mpeg_f_code[0][1], s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1631 s->pict_type == AV_PICTURE_TYPE_I ? "I" : (s->pict_type == AV_PICTURE_TYPE_P ? "P" : (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1632 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1633 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1634 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1639 // If 1, we memcpy blocks in xvmcvideo.
1640 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1641 ff_xvmc_init_block(s); // set s->block
1643 if (mpeg_decode_mb(s, s->block) < 0)
1646 if (s->current_picture.motion_val[0] && !s->encoding) { // note motion_val is normally NULL unless we want to extract the MVs
1647 const int wrap = s->b8_stride;
1648 int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1649 int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1650 int motion_x, motion_y, dir, i;
1652 for (i = 0; i < 2; i++) {
1653 for (dir = 0; dir < 2; dir++) {
1654 if (s->mb_intra || (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1655 motion_x = motion_y = 0;
1656 } else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1657 motion_x = s->mv[dir][0][0];
1658 motion_y = s->mv[dir][0][1];
1659 } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1660 motion_x = s->mv[dir][i][0];
1661 motion_y = s->mv[dir][i][1];
1664 s->current_picture.motion_val[dir][xy ][0] = motion_x;
1665 s->current_picture.motion_val[dir][xy ][1] = motion_y;
1666 s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1667 s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1668 s->current_picture.ref_index [dir][b8_xy ] =
1669 s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1670 assert(s->field_select[dir][i] == 0 || s->field_select[dir][i] == 1);
1678 s->dest[1] += 16 >> s->chroma_x_shift;
1679 s->dest[2] += 16 >> s->chroma_x_shift;
1681 ff_MPV_decode_mb(s, s->block);
1683 if (++s->mb_x >= s->mb_width) {
1684 const int mb_size = 16;
1686 ff_mpeg_draw_horiz_band(s, mb_size*(s->mb_y >> field_pic), mb_size);
1687 ff_MPV_report_decode_progress(s);
1690 s->mb_y += 1 << field_pic;
1692 if (s->mb_y >= s->mb_height) {
1693 int left = get_bits_left(&s->gb);
1694 int is_d10 = s->chroma_format == 2 && s->pict_type == AV_PICTURE_TYPE_I && avctx->profile == 0 && avctx->level == 5
1695 && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1696 && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1698 if (left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1699 || ((avctx->err_recognition & AV_EF_BUFFER) && left > 8)) {
1700 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1706 ff_init_block_index(s);
1709 /* skip mb handling */
1710 if (s->mb_skip_run == -1) {
1711 /* read increment again */
1714 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1715 MBINCR_VLC_BITS, 2);
1717 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1722 s->mb_skip_run += 33;
1723 } else if (code == 35) {
1724 if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1725 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1728 goto eos; /* end of slice */
1730 /* otherwise, stuffing, nothing to do */
1732 s->mb_skip_run += code;
1736 if (s->mb_skip_run) {
1738 if (s->pict_type == AV_PICTURE_TYPE_I) {
1739 av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1745 for (i = 0; i < 12; i++)
1746 s->block_last_index[i] = -1;
1747 if (s->picture_structure == PICT_FRAME)
1748 s->mv_type = MV_TYPE_16X16;
1750 s->mv_type = MV_TYPE_FIELD;
1751 if (s->pict_type == AV_PICTURE_TYPE_P) {
1752 /* if P type, zero motion vector is implied */
1753 s->mv_dir = MV_DIR_FORWARD;
1754 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1755 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1756 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1757 s->field_select[0][0] = (s->picture_structure - 1) & 1;
1759 /* if B type, reuse previous vectors and directions */
1760 s->mv[0][0][0] = s->last_mv[0][0][0];
1761 s->mv[0][0][1] = s->last_mv[0][0][1];
1762 s->mv[1][0][0] = s->last_mv[1][0][0];
1763 s->mv[1][0][1] = s->last_mv[1][0][1];
1768 eos: // end of slice
1769 *buf += (get_bits_count(&s->gb)-1)/8;
1770 av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1774 static int slice_decode_thread(AVCodecContext *c, void *arg)
1776 MpegEncContext *s = *(void**)arg;
1777 const uint8_t *buf = s->gb.buffer;
1778 int mb_y = s->start_mb_y;
1779 const int field_pic = s->picture_structure != PICT_FRAME;
1781 s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1784 uint32_t start_code;
1787 ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1789 av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1790 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1791 s->start_mb_y, s->end_mb_y, s->er.error_count);
1793 if (c->err_recognition & AV_EF_EXPLODE)
1795 if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1796 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
1798 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_AC_END | ER_DC_END | ER_MV_END);
1801 if (s->mb_y == s->end_mb_y)
1805 buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
1806 mb_y= (start_code - SLICE_MIN_START_CODE) << field_pic;
1807 if (s->picture_structure == PICT_BOTTOM_FIELD)
1809 if (mb_y < 0 || mb_y >= s->end_mb_y)
1815 * Handle slice ends.
1816 * @return 1 if it seems to be the last slice
1818 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1820 Mpeg1Context *s1 = avctx->priv_data;
1821 MpegEncContext *s = &s1->mpeg_enc_ctx;
1823 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1826 if (s->avctx->hwaccel) {
1827 if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1828 av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1831 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1832 ff_xvmc_field_end(s);
1834 /* end of slice reached */
1835 if (/*s->mb_y << field_pic == s->mb_height &&*/ !s->first_field) {
1838 ff_er_frame_end(&s->er);
1840 ff_MPV_frame_end(s);
1842 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
1843 int ret = av_frame_ref(pict, &s->current_picture_ptr->f);
1846 ff_print_debug_info(s, s->current_picture_ptr);
1848 if (avctx->active_thread_type & FF_THREAD_FRAME)
1849 s->picture_number++;
1850 /* latency of 1 frame for I- and P-frames */
1851 /* XXX: use another variable than picture_number */
1852 if (s->last_picture_ptr != NULL) {
1853 int ret = av_frame_ref(pict, &s->last_picture_ptr->f);
1856 ff_print_debug_info(s, s->last_picture_ptr);
1866 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1867 const uint8_t *buf, int buf_size)
1869 Mpeg1Context *s1 = avctx->priv_data;
1870 MpegEncContext *s = &s1->mpeg_enc_ctx;
1874 init_get_bits(&s->gb, buf, buf_size*8);
1876 width = get_bits(&s->gb, 12);
1877 height = get_bits(&s->gb, 12);
1878 if (width == 0 || height == 0) {
1879 av_log(avctx, AV_LOG_WARNING, "Invalid horizontal or vertical size "
1881 if (avctx->err_recognition & AV_EF_BITSTREAM)
1882 return AVERROR_INVALIDDATA;
1884 s->aspect_ratio_info = get_bits(&s->gb, 4);
1885 if (s->aspect_ratio_info == 0) {
1886 av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1887 if (avctx->err_recognition & AV_EF_BITSTREAM)
1890 s->frame_rate_index = get_bits(&s->gb, 4);
1891 if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1893 s->bit_rate = get_bits(&s->gb, 18) * 400;
1894 if (get_bits1(&s->gb) == 0) /* marker */
1899 s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
1900 skip_bits(&s->gb, 1);
1903 if (get_bits1(&s->gb)) {
1904 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1906 for (i = 0; i < 64; i++) {
1907 j = s->dsp.idct_permutation[i];
1908 v = ff_mpeg1_default_intra_matrix[i];
1909 s->intra_matrix[j] = v;
1910 s->chroma_intra_matrix[j] = v;
1913 if (get_bits1(&s->gb)) {
1914 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1916 for (i = 0; i < 64; i++) {
1917 int j = s->dsp.idct_permutation[i];
1918 v = ff_mpeg1_default_non_intra_matrix[i];
1919 s->inter_matrix[j] = v;
1920 s->chroma_inter_matrix[j] = v;
1924 if (show_bits(&s->gb, 23) != 0) {
1925 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
1929 /* we set MPEG-2 parameters so that it emulates MPEG-1 */
1930 s->progressive_sequence = 1;
1931 s->progressive_frame = 1;
1932 s->picture_structure = PICT_FRAME;
1933 s->frame_pred_frame_dct = 1;
1934 s->chroma_format = 1;
1935 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
1936 s->out_format = FMT_MPEG1;
1937 s->swap_uv = 0; // AFAIK VCR2 does not have SEQ_HEADER
1938 if (s->flags & CODEC_FLAG_LOW_DELAY)
1941 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1942 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
1943 s->avctx->rc_buffer_size, s->bit_rate);
1948 static int vcr2_init_sequence(AVCodecContext *avctx)
1950 Mpeg1Context *s1 = avctx->priv_data;
1951 MpegEncContext *s = &s1->mpeg_enc_ctx;
1954 /* start new MPEG-1 context decoding */
1955 s->out_format = FMT_MPEG1;
1956 if (s1->mpeg_enc_ctx_allocated) {
1957 ff_MPV_common_end(s);
1959 s->width = avctx->coded_width;
1960 s->height = avctx->coded_height;
1961 avctx->has_b_frames = 0; // true?
1964 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1965 avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1967 if (avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel ||
1968 s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)
1969 if (avctx->idct_algo == FF_IDCT_AUTO)
1970 avctx->idct_algo = FF_IDCT_SIMPLE;
1972 if (ff_MPV_common_init(s) < 0)
1974 exchange_uv(s); // common init reset pblocks, so we swap them here
1975 s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
1976 s1->mpeg_enc_ctx_allocated = 1;
1978 for (i = 0; i < 64; i++) {
1979 int j = s->dsp.idct_permutation[i];
1980 v = ff_mpeg1_default_intra_matrix[i];
1981 s->intra_matrix[j] = v;
1982 s->chroma_intra_matrix[j] = v;
1984 v = ff_mpeg1_default_non_intra_matrix[i];
1985 s->inter_matrix[j] = v;
1986 s->chroma_inter_matrix[j] = v;
1989 s->progressive_sequence = 1;
1990 s->progressive_frame = 1;
1991 s->picture_structure = PICT_FRAME;
1992 s->frame_pred_frame_dct = 1;
1993 s->chroma_format = 1;
1994 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1995 s1->save_width = s->width;
1996 s1->save_height = s->height;
1997 s1->save_progressive_seq = s->progressive_sequence;
2002 static void mpeg_decode_user_data(AVCodecContext *avctx,
2003 const uint8_t *p, int buf_size)
2005 const uint8_t *buf_end = p + buf_size;
2007 /* we parse the DTG active format information */
2008 if (buf_end - p >= 5 &&
2009 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2017 if (buf_end - p < 1)
2019 avctx->dtg_active_format = p[0] & 0x0f;
2024 static void mpeg_decode_gop(AVCodecContext *avctx,
2025 const uint8_t *buf, int buf_size)
2027 Mpeg1Context *s1 = avctx->priv_data;
2028 MpegEncContext *s = &s1->mpeg_enc_ctx;
2030 int time_code_hours, time_code_minutes;
2031 int time_code_seconds, time_code_pictures;
2034 init_get_bits(&s->gb, buf, buf_size*8);
2036 skip_bits1(&s->gb); /* drop_frame_flag */
2038 time_code_hours = get_bits(&s->gb, 5);
2039 time_code_minutes = get_bits(&s->gb, 6);
2040 skip_bits1(&s->gb); // marker bit
2041 time_code_seconds = get_bits(&s->gb, 6);
2042 time_code_pictures = get_bits(&s->gb, 6);
2044 s1->closed_gop = get_bits1(&s->gb);
2045 /*broken_link indicate that after editing the
2046 reference frames of the first B-Frames after GOP I-Frame
2047 are missing (open gop)*/
2048 broken_link = get_bits1(&s->gb);
2050 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2051 av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2052 time_code_hours, time_code_minutes, time_code_seconds,
2053 time_code_pictures, s1->closed_gop, broken_link);
2056 static int decode_chunks(AVCodecContext *avctx,
2057 AVFrame *picture, int *got_output,
2058 const uint8_t *buf, int buf_size)
2060 Mpeg1Context *s = avctx->priv_data;
2061 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2062 const uint8_t *buf_ptr = buf;
2063 const uint8_t *buf_end = buf + buf_size;
2064 int ret, input_size;
2068 /* find next start code */
2069 uint32_t start_code = -1;
2070 buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2071 if (start_code > 0x1ff) {
2072 if (s2->pict_type != AV_PICTURE_TYPE_B || avctx->skip_frame <= AVDISCARD_DEFAULT) {
2073 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2076 avctx->execute(avctx, slice_decode_thread, &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
2077 for (i = 0; i < s->slice_count; i++)
2078 s2->er.error_count += s2->thread_context[i]->er.error_count;
2081 if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
2082 && avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)
2083 ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2085 ret = slice_end(avctx, picture);
2089 if (s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2094 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2097 input_size = buf_end - buf_ptr;
2099 if (avctx->debug & FF_DEBUG_STARTCODE) {
2100 av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2103 /* prepare data for next start code */
2104 switch (start_code) {
2105 case SEQ_START_CODE:
2106 if (last_code == 0) {
2107 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2110 av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2111 if (avctx->err_recognition & AV_EF_EXPLODE)
2112 return AVERROR_INVALIDDATA;
2116 case PICTURE_START_CODE:
2117 if (s2->width <= 0 || s2->height <= 0) {
2118 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2119 s2->width, s2->height);
2120 return AVERROR_INVALIDDATA;
2123 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) && s->slice_count) {
2126 avctx->execute(avctx, slice_decode_thread,
2127 s2->thread_context, NULL,
2128 s->slice_count, sizeof(void*));
2129 for (i = 0; i < s->slice_count; i++)
2130 s2->er.error_count += s2->thread_context[i]->er.error_count;
2133 if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2134 ret = mpeg_decode_postinit(avctx);
2136 av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
2140 /* we have a complete image: we try to decompress it */
2141 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2143 s2->first_slice = 1;
2144 last_code = PICTURE_START_CODE;
2146 av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
2147 if (avctx->err_recognition & AV_EF_EXPLODE)
2148 return AVERROR_INVALIDDATA;
2151 case EXT_START_CODE:
2152 init_get_bits(&s2->gb, buf_ptr, input_size*8);
2154 switch (get_bits(&s2->gb, 4)) {
2156 if (last_code == 0) {
2157 mpeg_decode_sequence_extension(s);
2159 av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
2160 if (avctx->err_recognition & AV_EF_EXPLODE)
2161 return AVERROR_INVALIDDATA;
2165 mpeg_decode_sequence_display_extension(s);
2168 mpeg_decode_quant_matrix_extension(s2);
2171 mpeg_decode_picture_display_extension(s);
2174 if (last_code == PICTURE_START_CODE) {
2175 mpeg_decode_picture_coding_extension(s);
2177 av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
2178 if (avctx->err_recognition & AV_EF_EXPLODE)
2179 return AVERROR_INVALIDDATA;
2184 case USER_START_CODE:
2185 mpeg_decode_user_data(avctx, buf_ptr, input_size);
2187 case GOP_START_CODE:
2188 if (last_code == 0) {
2190 mpeg_decode_gop(avctx, buf_ptr, input_size);
2193 av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
2194 if (avctx->err_recognition & AV_EF_EXPLODE)
2195 return AVERROR_INVALIDDATA;
2199 if (start_code >= SLICE_MIN_START_CODE &&
2200 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2201 const int field_pic = s2->picture_structure != PICT_FRAME;
2202 int mb_y = (start_code - SLICE_MIN_START_CODE) << field_pic;
2203 last_code = SLICE_MIN_START_CODE;
2205 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2208 if (mb_y >= s2->mb_height) {
2209 av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2213 if (s2->last_picture_ptr == NULL) {
2214 /* Skip B-frames if we do not have reference frames and gop is not closed */
2215 if (s2->pict_type == AV_PICTURE_TYPE_B) {
2220 if (s2->pict_type == AV_PICTURE_TYPE_I)
2222 if (s2->next_picture_ptr == NULL) {
2223 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2224 if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) break;
2226 if ((avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type == AV_PICTURE_TYPE_B) ||
2227 (avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type != AV_PICTURE_TYPE_I) ||
2228 avctx->skip_frame >= AVDISCARD_ALL)
2231 if (!s->mpeg_enc_ctx_allocated)
2234 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2235 if (mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2239 if (!s2->pict_type) {
2240 av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2241 if (avctx->err_recognition & AV_EF_EXPLODE)
2242 return AVERROR_INVALIDDATA;
2246 if (s2->first_slice) {
2247 s2->first_slice = 0;
2248 if (mpeg_field_start(s2, buf, buf_size) < 0)
2251 if (!s2->current_picture_ptr) {
2252 av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2253 return AVERROR_INVALIDDATA;
2256 if (avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU) {
2261 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2262 int threshold = (s2->mb_height * s->slice_count +
2263 s2->slice_context_count / 2) /
2264 s2->slice_context_count;
2265 if (threshold <= mb_y) {
2266 MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2268 thread_context->start_mb_y = mb_y;
2269 thread_context->end_mb_y = s2->mb_height;
2270 if (s->slice_count) {
2271 s2->thread_context[s->slice_count-1]->end_mb_y = mb_y;
2272 ret = ff_update_duplicate_context(thread_context,
2277 init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2280 buf_ptr += 2; // FIXME add minimum number of bytes per slice
2282 ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2286 if (avctx->err_recognition & AV_EF_EXPLODE)
2288 if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2289 ff_er_add_slice(&s2->er, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2291 ff_er_add_slice(&s2->er, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x-1, s2->mb_y, ER_AC_END | ER_DC_END | ER_MV_END);
2300 static int mpeg_decode_frame(AVCodecContext *avctx,
2301 void *data, int *got_output,
2304 const uint8_t *buf = avpkt->data;
2305 int buf_size = avpkt->size;
2306 Mpeg1Context *s = avctx->priv_data;
2307 AVFrame *picture = data;
2308 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2309 av_dlog(avctx, "fill_buffer\n");
2311 if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2312 /* special case for last picture */
2313 if (s2->low_delay == 0 && s2->next_picture_ptr) {
2314 int ret = av_frame_ref(picture, &s2->next_picture_ptr->f);
2318 s2->next_picture_ptr = NULL;
2325 if (s2->flags & CODEC_FLAG_TRUNCATED) {
2326 int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2328 if (ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0)
2332 if (s->mpeg_enc_ctx_allocated == 0 && avctx->codec_tag == AV_RL32("VCR2"))
2333 vcr2_init_sequence(avctx);
2337 if (avctx->extradata && !s->extradata_decoded) {
2338 int ret = decode_chunks(avctx, picture, got_output, avctx->extradata, avctx->extradata_size);
2339 s->extradata_decoded = 1;
2340 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
2344 return decode_chunks(avctx, picture, got_output, buf, buf_size);
2348 static void flush(AVCodecContext *avctx)
2350 Mpeg1Context *s = avctx->priv_data;
2355 ff_mpeg_flush(avctx);
2358 static int mpeg_decode_end(AVCodecContext *avctx)
2360 Mpeg1Context *s = avctx->priv_data;
2362 if (s->mpeg_enc_ctx_allocated)
2363 ff_MPV_common_end(&s->mpeg_enc_ctx);
2367 static const AVProfile mpeg2_video_profiles[] = {
2368 { FF_PROFILE_MPEG2_422, "4:2:2" },
2369 { FF_PROFILE_MPEG2_HIGH, "High" },
2370 { FF_PROFILE_MPEG2_SS, "Spatially Scalable" },
2371 { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable" },
2372 { FF_PROFILE_MPEG2_MAIN, "Main" },
2373 { FF_PROFILE_MPEG2_SIMPLE, "Simple" },
2374 { FF_PROFILE_RESERVED, "Reserved" },
2375 { FF_PROFILE_RESERVED, "Reserved" },
2376 { FF_PROFILE_UNKNOWN },
2380 AVCodec ff_mpeg1video_decoder = {
2381 .name = "mpeg1video",
2382 .type = AVMEDIA_TYPE_VIDEO,
2383 .id = AV_CODEC_ID_MPEG1VIDEO,
2384 .priv_data_size = sizeof(Mpeg1Context),
2385 .init = mpeg_decode_init,
2386 .close = mpeg_decode_end,
2387 .decode = mpeg_decode_frame,
2388 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2389 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2390 CODEC_CAP_SLICE_THREADS,
2392 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2393 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2396 AVCodec ff_mpeg2video_decoder = {
2397 .name = "mpeg2video",
2398 .type = AVMEDIA_TYPE_VIDEO,
2399 .id = AV_CODEC_ID_MPEG2VIDEO,
2400 .priv_data_size = sizeof(Mpeg1Context),
2401 .init = mpeg_decode_init,
2402 .close = mpeg_decode_end,
2403 .decode = mpeg_decode_frame,
2404 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2405 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2406 CODEC_CAP_SLICE_THREADS,
2408 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2409 .profiles = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2412 #if CONFIG_MPEG_XVMC_DECODER
2413 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2415 if (avctx->active_thread_type & FF_THREAD_SLICE)
2417 if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2419 if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2420 av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2422 mpeg_decode_init(avctx);
2424 avctx->pix_fmt = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2425 avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2430 AVCodec ff_mpeg_xvmc_decoder = {
2431 .name = "mpegvideo_xvmc",
2432 .type = AVMEDIA_TYPE_VIDEO,
2433 .id = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2434 .priv_data_size = sizeof(Mpeg1Context),
2435 .init = mpeg_mc_decode_init,
2436 .close = mpeg_decode_end,
2437 .decode = mpeg_decode_frame,
2438 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2439 CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2441 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2446 #if CONFIG_MPEG_VDPAU_DECODER
2447 AVCodec ff_mpeg_vdpau_decoder = {
2448 .name = "mpegvideo_vdpau",
2449 .type = AVMEDIA_TYPE_VIDEO,
2450 .id = AV_CODEC_ID_MPEG2VIDEO,
2451 .priv_data_size = sizeof(Mpeg1Context),
2452 .init = mpeg_decode_init,
2453 .close = mpeg_decode_end,
2454 .decode = mpeg_decode_frame,
2455 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2456 CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2458 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2462 #if CONFIG_MPEG1_VDPAU_DECODER
2463 AVCodec ff_mpeg1_vdpau_decoder = {
2464 .name = "mpeg1video_vdpau",
2465 .type = AVMEDIA_TYPE_VIDEO,
2466 .id = AV_CODEC_ID_MPEG1VIDEO,
2467 .priv_data_size = sizeof(Mpeg1Context),
2468 .init = mpeg_decode_init,
2469 .close = mpeg_decode_end,
2470 .decode = mpeg_decode_frame,
2471 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2472 CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2474 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),