882fdf3d825643daba94364ac1873a8b84c68379
[libav.git] / libavcodec / mpeg12dec.c
1 /*
2 * MPEG-1/2 decoder
3 * Copyright (c) 2000, 2001 Fabrice Bellard
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5 *
6 * This file is part of Libav.
7 *
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.
12 *
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.
17 *
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
21 */
22
23 /**
24 * @file
25 * MPEG-1/2 decoder
26 */
27
28 #include <inttypes.h>
29
30 #include "libavutil/attributes.h"
31 #include "libavutil/internal.h"
32 #include "libavutil/stereo3d.h"
33
34 #include "avcodec.h"
35 #include "bytestream.h"
36 #include "error_resilience.h"
37 #include "idctdsp.h"
38 #include "internal.h"
39 #include "mpeg_er.h"
40 #include "mpeg12.h"
41 #include "mpeg12data.h"
42 #include "mpegutils.h"
43 #include "mpegvideo.h"
44 #include "mpegvideodata.h"
45 #include "profiles.h"
46 #include "thread.h"
47 #include "version.h"
48 #include "xvmc_internal.h"
49
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 */
55 AVStereo3D stereo3d;
56 int has_stereo3d;
57 uint8_t *a53_caption;
58 int a53_caption_size;
59 uint8_t afd;
60 int has_afd;
61 int slice_count;
62 int save_aspect_info;
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 */
67 int first_slice;
68 int extradata_decoded;
69 } Mpeg1Context;
70
71 #define MB_TYPE_ZERO_MV 0x20000000
72
73 static const uint32_t ptype2mb_type[7] = {
74 MB_TYPE_INTRA,
75 MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
76 MB_TYPE_L0,
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,
81 };
82
83 static const uint32_t btype2mb_type[11] = {
84 MB_TYPE_INTRA,
85 MB_TYPE_L1,
86 MB_TYPE_L1 | MB_TYPE_CBP,
87 MB_TYPE_L0,
88 MB_TYPE_L0 | MB_TYPE_CBP,
89 MB_TYPE_L0L1,
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,
95 };
96
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,
102 };
103
104 /* as H.263, but only 17 codes */
105 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
106 {
107 int code, sign, val, shift;
108
109 code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
110 if (code == 0)
111 return pred;
112 if (code < 0)
113 return 0xffff;
114
115 sign = get_bits1(&s->gb);
116 shift = fcode - 1;
117 val = code;
118 if (shift) {
119 val = (val - 1) << shift;
120 val |= get_bits(&s->gb, shift);
121 val++;
122 }
123 if (sign)
124 val = -val;
125 val += pred;
126
127 /* modulo decoding */
128 return sign_extend(val, 5 + shift);
129 }
130
131 #define MAX_INDEX (64 - 1)
132 #define check_scantable_index(ctx, x) \
133 do { \
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; \
138 } \
139 } while (0)
140
141 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
142 int16_t *block, int n)
143 {
144 int level, dc, diff, i, j, run;
145 int component;
146 RLTable *rl = &ff_rl_mpeg1;
147 uint8_t *const scantable = s->intra_scantable.permutated;
148 const uint16_t *quant_matrix = s->intra_matrix;
149 const int qscale = s->qscale;
150
151 /* DC coefficient */
152 component = (n <= 3 ? 0 : n - 4 + 1);
153 diff = decode_dc(&s->gb, component);
154 if (diff >= 0xffff)
155 return AVERROR_INVALIDDATA;
156 dc = s->last_dc[component];
157 dc += diff;
158 s->last_dc[component] = dc;
159 block[0] = dc * quant_matrix[0];
160 ff_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
161 i = 0;
162 {
163 OPEN_READER(re, &s->gb);
164 /* now quantify & encode AC coefficients */
165 for (;;) {
166 UPDATE_CACHE(re, &s->gb);
167 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
168 TEX_VLC_BITS, 2, 0);
169
170 if (level == 127) {
171 break;
172 } else if (level != 0) {
173 i += run;
174 if (i > MAX_INDEX)
175 break;
176 j = scantable[i];
177 level = (level * qscale * quant_matrix[j]) >> 4;
178 level = (level - 1) | 1;
179 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
180 SHOW_SBITS(re, &s->gb, 1);
181 LAST_SKIP_BITS(re, &s->gb, 1);
182 } else {
183 /* escape */
184 run = SHOW_UBITS(re, &s->gb, 6) + 1;
185 LAST_SKIP_BITS(re, &s->gb, 6);
186 UPDATE_CACHE(re, &s->gb);
187 level = SHOW_SBITS(re, &s->gb, 8);
188 SKIP_BITS(re, &s->gb, 8);
189 if (level == -128) {
190 level = SHOW_UBITS(re, &s->gb, 8) - 256;
191 LAST_SKIP_BITS(re, &s->gb, 8);
192 } else if (level == 0) {
193 level = SHOW_UBITS(re, &s->gb, 8);
194 LAST_SKIP_BITS(re, &s->gb, 8);
195 }
196 i += run;
197 if (i > MAX_INDEX)
198 break;
199 j = scantable[i];
200 if (level < 0) {
201 level = -level;
202 level = (level * qscale * quant_matrix[j]) >> 4;
203 level = (level - 1) | 1;
204 level = -level;
205 } else {
206 level = (level * qscale * quant_matrix[j]) >> 4;
207 level = (level - 1) | 1;
208 }
209 }
210
211 block[j] = level;
212 }
213 CLOSE_READER(re, &s->gb);
214 }
215
216 check_scantable_index(s, i);
217
218 s->block_last_index[n] = i;
219 return 0;
220 }
221
222 int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
223 {
224 return mpeg1_decode_block_intra(s, block, n);
225 }
226
227 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
228 int16_t *block, int n)
229 {
230 int level, i, j, run;
231 RLTable *rl = &ff_rl_mpeg1;
232 uint8_t *const scantable = s->intra_scantable.permutated;
233 const uint16_t *quant_matrix = s->inter_matrix;
234 const int qscale = s->qscale;
235
236 {
237 OPEN_READER(re, &s->gb);
238 i = -1;
239 // special case for first coefficient, no need to add second VLC table
240 UPDATE_CACHE(re, &s->gb);
241 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
242 level = (3 * qscale * quant_matrix[0]) >> 5;
243 level = (level - 1) | 1;
244 if (GET_CACHE(re, &s->gb) & 0x40000000)
245 level = -level;
246 block[0] = level;
247 i++;
248 SKIP_BITS(re, &s->gb, 2);
249 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
250 goto end;
251 }
252 /* now quantify & encode AC coefficients */
253 for (;;) {
254 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
255 TEX_VLC_BITS, 2, 0);
256
257 if (level != 0) {
258 i += run;
259 if (i > MAX_INDEX)
260 break;
261 j = scantable[i];
262 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
263 level = (level - 1) | 1;
264 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
265 SHOW_SBITS(re, &s->gb, 1);
266 SKIP_BITS(re, &s->gb, 1);
267 } else {
268 /* escape */
269 run = SHOW_UBITS(re, &s->gb, 6) + 1;
270 LAST_SKIP_BITS(re, &s->gb, 6);
271 UPDATE_CACHE(re, &s->gb);
272 level = SHOW_SBITS(re, &s->gb, 8);
273 SKIP_BITS(re, &s->gb, 8);
274 if (level == -128) {
275 level = SHOW_UBITS(re, &s->gb, 8) - 256;
276 SKIP_BITS(re, &s->gb, 8);
277 } else if (level == 0) {
278 level = SHOW_UBITS(re, &s->gb, 8);
279 SKIP_BITS(re, &s->gb, 8);
280 }
281 i += run;
282 if (i > MAX_INDEX)
283 break;
284 j = scantable[i];
285 if (level < 0) {
286 level = -level;
287 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
288 level = (level - 1) | 1;
289 level = -level;
290 } else {
291 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
292 level = (level - 1) | 1;
293 }
294 }
295
296 block[j] = level;
297 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
298 break;
299 UPDATE_CACHE(re, &s->gb);
300 }
301 end:
302 LAST_SKIP_BITS(re, &s->gb, 2);
303 CLOSE_READER(re, &s->gb);
304 }
305
306 check_scantable_index(s, i);
307
308 s->block_last_index[n] = i;
309 return 0;
310 }
311
312 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
313 int16_t *block, int n)
314 {
315 int level, i, j, run;
316 RLTable *rl = &ff_rl_mpeg1;
317 uint8_t *const scantable = s->intra_scantable.permutated;
318 const int qscale = s->qscale;
319
320 {
321 OPEN_READER(re, &s->gb);
322 i = -1;
323 // Special case for first coefficient, no need to add second VLC table.
324 UPDATE_CACHE(re, &s->gb);
325 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
326 level = (3 * qscale) >> 1;
327 level = (level - 1) | 1;
328 if (GET_CACHE(re, &s->gb) & 0x40000000)
329 level = -level;
330 block[0] = level;
331 i++;
332 SKIP_BITS(re, &s->gb, 2);
333 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
334 goto end;
335 }
336
337 /* now quantify & encode AC coefficients */
338 for (;;) {
339 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
340 TEX_VLC_BITS, 2, 0);
341
342 if (level != 0) {
343 i += run;
344 if (i > MAX_INDEX)
345 break;
346 j = scantable[i];
347 level = ((level * 2 + 1) * qscale) >> 1;
348 level = (level - 1) | 1;
349 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
350 SHOW_SBITS(re, &s->gb, 1);
351 SKIP_BITS(re, &s->gb, 1);
352 } else {
353 /* escape */
354 run = SHOW_UBITS(re, &s->gb, 6) + 1;
355 LAST_SKIP_BITS(re, &s->gb, 6);
356 UPDATE_CACHE(re, &s->gb);
357 level = SHOW_SBITS(re, &s->gb, 8);
358 SKIP_BITS(re, &s->gb, 8);
359 if (level == -128) {
360 level = SHOW_UBITS(re, &s->gb, 8) - 256;
361 SKIP_BITS(re, &s->gb, 8);
362 } else if (level == 0) {
363 level = SHOW_UBITS(re, &s->gb, 8);
364 SKIP_BITS(re, &s->gb, 8);
365 }
366 i += run;
367 if (i > MAX_INDEX)
368 break;
369 j = scantable[i];
370 if (level < 0) {
371 level = -level;
372 level = ((level * 2 + 1) * qscale) >> 1;
373 level = (level - 1) | 1;
374 level = -level;
375 } else {
376 level = ((level * 2 + 1) * qscale) >> 1;
377 level = (level - 1) | 1;
378 }
379 }
380
381 block[j] = level;
382 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
383 break;
384 UPDATE_CACHE(re, &s->gb);
385 }
386 end:
387 LAST_SKIP_BITS(re, &s->gb, 2);
388 CLOSE_READER(re, &s->gb);
389 }
390
391 check_scantable_index(s, i);
392
393 s->block_last_index[n] = i;
394 return 0;
395 }
396
397 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
398 int16_t *block, int n)
399 {
400 int level, i, j, run;
401 RLTable *rl = &ff_rl_mpeg1;
402 uint8_t *const scantable = s->intra_scantable.permutated;
403 const uint16_t *quant_matrix;
404 const int qscale = s->qscale;
405 int mismatch;
406
407 mismatch = 1;
408
409 {
410 OPEN_READER(re, &s->gb);
411 i = -1;
412 if (n < 4)
413 quant_matrix = s->inter_matrix;
414 else
415 quant_matrix = s->chroma_inter_matrix;
416
417 // Special case for first coefficient, no need to add second VLC table.
418 UPDATE_CACHE(re, &s->gb);
419 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
420 level = (3 * qscale * quant_matrix[0]) >> 5;
421 if (GET_CACHE(re, &s->gb) & 0x40000000)
422 level = -level;
423 block[0] = level;
424 mismatch ^= level;
425 i++;
426 SKIP_BITS(re, &s->gb, 2);
427 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
428 goto end;
429 }
430
431 /* now quantify & encode AC coefficients */
432 for (;;) {
433 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
434 TEX_VLC_BITS, 2, 0);
435
436 if (level != 0) {
437 i += run;
438 if (i > MAX_INDEX)
439 break;
440 j = scantable[i];
441 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
442 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
443 SHOW_SBITS(re, &s->gb, 1);
444 SKIP_BITS(re, &s->gb, 1);
445 } else {
446 /* escape */
447 run = SHOW_UBITS(re, &s->gb, 6) + 1;
448 LAST_SKIP_BITS(re, &s->gb, 6);
449 UPDATE_CACHE(re, &s->gb);
450 level = SHOW_SBITS(re, &s->gb, 12);
451 SKIP_BITS(re, &s->gb, 12);
452
453 i += run;
454 if (i > MAX_INDEX)
455 break;
456 j = scantable[i];
457 if (level < 0) {
458 level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
459 level = -level;
460 } else {
461 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
462 }
463 }
464
465 mismatch ^= level;
466 block[j] = level;
467 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
468 break;
469 UPDATE_CACHE(re, &s->gb);
470 }
471 end:
472 LAST_SKIP_BITS(re, &s->gb, 2);
473 CLOSE_READER(re, &s->gb);
474 }
475 block[63] ^= (mismatch & 1);
476
477 check_scantable_index(s, i);
478
479 s->block_last_index[n] = i;
480 return 0;
481 }
482
483 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
484 int16_t *block, int n)
485 {
486 int level, i, j, run;
487 RLTable *rl = &ff_rl_mpeg1;
488 uint8_t *const scantable = s->intra_scantable.permutated;
489 const int qscale = s->qscale;
490 OPEN_READER(re, &s->gb);
491 i = -1;
492
493 // special case for first coefficient, no need to add second VLC table
494 UPDATE_CACHE(re, &s->gb);
495 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
496 level = (3 * qscale) >> 1;
497 if (GET_CACHE(re, &s->gb) & 0x40000000)
498 level = -level;
499 block[0] = level;
500 i++;
501 SKIP_BITS(re, &s->gb, 2);
502 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
503 goto end;
504 }
505
506 /* now quantify & encode AC coefficients */
507 for (;;) {
508 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
509
510 if (level != 0) {
511 i += run;
512 if (i > MAX_INDEX)
513 break;
514 j = scantable[i];
515 level = ((level * 2 + 1) * qscale) >> 1;
516 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
517 SHOW_SBITS(re, &s->gb, 1);
518 SKIP_BITS(re, &s->gb, 1);
519 } else {
520 /* escape */
521 run = SHOW_UBITS(re, &s->gb, 6) + 1;
522 LAST_SKIP_BITS(re, &s->gb, 6);
523 UPDATE_CACHE(re, &s->gb);
524 level = SHOW_SBITS(re, &s->gb, 12);
525 SKIP_BITS(re, &s->gb, 12);
526
527 i += run;
528 if (i > MAX_INDEX)
529 break;
530 j = scantable[i];
531 if (level < 0) {
532 level = ((-level * 2 + 1) * qscale) >> 1;
533 level = -level;
534 } else {
535 level = ((level * 2 + 1) * qscale) >> 1;
536 }
537 }
538
539 block[j] = level;
540 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
541 break;
542 UPDATE_CACHE(re, &s->gb);
543 }
544 end:
545 LAST_SKIP_BITS(re, &s->gb, 2);
546 CLOSE_READER(re, &s->gb);
547
548 check_scantable_index(s, i);
549
550 s->block_last_index[n] = i;
551 return 0;
552 }
553
554 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
555 int16_t *block, int n)
556 {
557 int level, dc, diff, i, j, run;
558 int component;
559 RLTable *rl;
560 uint8_t *const scantable = s->intra_scantable.permutated;
561 const uint16_t *quant_matrix;
562 const int qscale = s->qscale;
563 int mismatch;
564
565 /* DC coefficient */
566 if (n < 4) {
567 quant_matrix = s->intra_matrix;
568 component = 0;
569 } else {
570 quant_matrix = s->chroma_intra_matrix;
571 component = (n & 1) + 1;
572 }
573 diff = decode_dc(&s->gb, component);
574 if (diff >= 0xffff)
575 return AVERROR_INVALIDDATA;
576 dc = s->last_dc[component];
577 dc += diff;
578 s->last_dc[component] = dc;
579 block[0] = dc << (3 - s->intra_dc_precision);
580 ff_dlog(s->avctx, "dc=%d\n", block[0]);
581 mismatch = block[0] ^ 1;
582 i = 0;
583 if (s->intra_vlc_format)
584 rl = &ff_rl_mpeg2;
585 else
586 rl = &ff_rl_mpeg1;
587
588 {
589 OPEN_READER(re, &s->gb);
590 /* now quantify & encode AC coefficients */
591 for (;;) {
592 UPDATE_CACHE(re, &s->gb);
593 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
594 TEX_VLC_BITS, 2, 0);
595
596 if (level == 127) {
597 break;
598 } else if (level != 0) {
599 i += run;
600 if (i > MAX_INDEX)
601 break;
602 j = scantable[i];
603 level = (level * qscale * quant_matrix[j]) >> 4;
604 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
605 SHOW_SBITS(re, &s->gb, 1);
606 LAST_SKIP_BITS(re, &s->gb, 1);
607 } else {
608 /* escape */
609 run = SHOW_UBITS(re, &s->gb, 6) + 1;
610 LAST_SKIP_BITS(re, &s->gb, 6);
611 UPDATE_CACHE(re, &s->gb);
612 level = SHOW_SBITS(re, &s->gb, 12);
613 SKIP_BITS(re, &s->gb, 12);
614 i += run;
615 if (i > MAX_INDEX)
616 break;
617 j = scantable[i];
618 if (level < 0) {
619 level = (-level * qscale * quant_matrix[j]) >> 4;
620 level = -level;
621 } else {
622 level = (level * qscale * quant_matrix[j]) >> 4;
623 }
624 }
625
626 mismatch ^= level;
627 block[j] = level;
628 }
629 CLOSE_READER(re, &s->gb);
630 }
631 block[63] ^= mismatch & 1;
632
633 check_scantable_index(s, i);
634
635 s->block_last_index[n] = i;
636 return 0;
637 }
638
639 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
640 int16_t *block, int n)
641 {
642 int level, dc, diff, i, j, run;
643 int component;
644 RLTable *rl;
645 uint8_t *const scantable = s->intra_scantable.permutated;
646 const uint16_t *quant_matrix;
647 const int qscale = s->qscale;
648
649 /* DC coefficient */
650 if (n < 4) {
651 quant_matrix = s->intra_matrix;
652 component = 0;
653 } else {
654 quant_matrix = s->chroma_intra_matrix;
655 component = (n & 1) + 1;
656 }
657 diff = decode_dc(&s->gb, component);
658 if (diff >= 0xffff)
659 return AVERROR_INVALIDDATA;
660 dc = s->last_dc[component];
661 dc += diff;
662 s->last_dc[component] = dc;
663 block[0] = dc << (3 - s->intra_dc_precision);
664 i = 0;
665 if (s->intra_vlc_format)
666 rl = &ff_rl_mpeg2;
667 else
668 rl = &ff_rl_mpeg1;
669
670 {
671 OPEN_READER(re, &s->gb);
672 /* now quantify & encode AC coefficients */
673 for (;;) {
674 UPDATE_CACHE(re, &s->gb);
675 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
676 TEX_VLC_BITS, 2, 0);
677
678 if (level == 127) {
679 break;
680 } else if (level != 0) {
681 i += run;
682 if (i > MAX_INDEX)
683 break;
684 j = scantable[i];
685 level = (level * qscale * quant_matrix[j]) >> 4;
686 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
687 SHOW_SBITS(re, &s->gb, 1);
688 LAST_SKIP_BITS(re, &s->gb, 1);
689 } else {
690 /* escape */
691 run = SHOW_UBITS(re, &s->gb, 6) + 1;
692 LAST_SKIP_BITS(re, &s->gb, 6);
693 UPDATE_CACHE(re, &s->gb);
694 level = SHOW_SBITS(re, &s->gb, 12);
695 SKIP_BITS(re, &s->gb, 12);
696 i += run;
697 if (i > MAX_INDEX)
698 break;
699 j = scantable[i];
700 if (level < 0) {
701 level = (-level * qscale * quant_matrix[j]) >> 4;
702 level = -level;
703 } else {
704 level = (level * qscale * quant_matrix[j]) >> 4;
705 }
706 }
707
708 block[j] = level;
709 }
710 CLOSE_READER(re, &s->gb);
711 }
712
713 check_scantable_index(s, i);
714
715 s->block_last_index[n] = i;
716 return 0;
717 }
718
719 /******************************************/
720 /* decoding */
721
722 static inline int get_dmv(MpegEncContext *s)
723 {
724 if (get_bits1(&s->gb))
725 return 1 - (get_bits1(&s->gb) << 1);
726 else
727 return 0;
728 }
729
730 static inline int get_qscale(MpegEncContext *s)
731 {
732 int qscale = get_bits(&s->gb, 5);
733 if (s->q_scale_type)
734 return non_linear_qscale[qscale];
735 else
736 return qscale << 1;
737 }
738
739 /* motion type (for MPEG-2) */
740 #define MT_FIELD 1
741 #define MT_FRAME 2
742 #define MT_16X8 2
743 #define MT_DMV 3
744
745 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
746 {
747 int i, j, k, cbp, val, mb_type, motion_type;
748 const int mb_block_count = 4 + (1 << s->chroma_format);
749 int ret;
750
751 ff_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
752
753 assert(s->mb_skipped == 0);
754
755 if (s->mb_skip_run-- != 0) {
756 if (s->pict_type == AV_PICTURE_TYPE_P) {
757 s->mb_skipped = 1;
758 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
759 MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
760 } else {
761 int mb_type;
762
763 if (s->mb_x)
764 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
765 else
766 // FIXME not sure if this is allowed in MPEG at all
767 mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
768 if (IS_INTRA(mb_type))
769 return AVERROR_INVALIDDATA;
770 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
771 mb_type | MB_TYPE_SKIP;
772 // assert(s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1] & (MB_TYPE_16x16 | MB_TYPE_16x8));
773
774 if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
775 s->mb_skipped = 1;
776 }
777
778 return 0;
779 }
780
781 switch (s->pict_type) {
782 default:
783 case AV_PICTURE_TYPE_I:
784 if (get_bits1(&s->gb) == 0) {
785 if (get_bits1(&s->gb) == 0) {
786 av_log(s->avctx, AV_LOG_ERROR,
787 "invalid mb type in I Frame at %d %d\n",
788 s->mb_x, s->mb_y);
789 return AVERROR_INVALIDDATA;
790 }
791 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
792 } else {
793 mb_type = MB_TYPE_INTRA;
794 }
795 break;
796 case AV_PICTURE_TYPE_P:
797 mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
798 if (mb_type < 0) {
799 av_log(s->avctx, AV_LOG_ERROR,
800 "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
801 return AVERROR_INVALIDDATA;
802 }
803 mb_type = ptype2mb_type[mb_type];
804 break;
805 case AV_PICTURE_TYPE_B:
806 mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
807 if (mb_type < 0) {
808 av_log(s->avctx, AV_LOG_ERROR,
809 "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
810 return AVERROR_INVALIDDATA;
811 }
812 mb_type = btype2mb_type[mb_type];
813 break;
814 }
815 ff_dlog(s->avctx, "mb_type=%x\n", mb_type);
816 // motion_type = 0; /* avoid warning */
817 if (IS_INTRA(mb_type)) {
818 s->bdsp.clear_blocks(s->block[0]);
819
820 if (!s->chroma_y_shift)
821 s->bdsp.clear_blocks(s->block[6]);
822
823 /* compute DCT type */
824 // FIXME: add an interlaced_dct coded var?
825 if (s->picture_structure == PICT_FRAME &&
826 !s->frame_pred_frame_dct)
827 s->interlaced_dct = get_bits1(&s->gb);
828
829 if (IS_QUANT(mb_type))
830 s->qscale = get_qscale(s);
831
832 if (s->concealment_motion_vectors) {
833 /* just parse them */
834 if (s->picture_structure != PICT_FRAME)
835 skip_bits1(&s->gb); /* field select */
836
837 s->mv[0][0][0] =
838 s->last_mv[0][0][0] =
839 s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
840 s->last_mv[0][0][0]);
841 s->mv[0][0][1] =
842 s->last_mv[0][0][1] =
843 s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
844 s->last_mv[0][0][1]);
845
846 skip_bits1(&s->gb); /* marker */
847 } else {
848 /* reset mv prediction */
849 memset(s->last_mv, 0, sizeof(s->last_mv));
850 }
851 s->mb_intra = 1;
852 #if FF_API_XVMC
853 FF_DISABLE_DEPRECATION_WARNINGS
854 // if 1, we memcpy blocks in xvmcvideo
855 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
856 ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
857 FF_ENABLE_DEPRECATION_WARNINGS
858 #endif /* FF_API_XVMC */
859
860 if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
861 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
862 for (i = 0; i < 6; i++)
863 mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
864 } else {
865 for (i = 0; i < mb_block_count; i++)
866 if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
867 return ret;
868 }
869 } else {
870 for (i = 0; i < 6; i++)
871 if ((ret = mpeg1_decode_block_intra(s, *s->pblocks[i], i)) < 0)
872 return ret;
873 }
874 } else {
875 if (mb_type & MB_TYPE_ZERO_MV) {
876 assert(mb_type & MB_TYPE_CBP);
877
878 s->mv_dir = MV_DIR_FORWARD;
879 if (s->picture_structure == PICT_FRAME) {
880 if (!s->frame_pred_frame_dct)
881 s->interlaced_dct = get_bits1(&s->gb);
882 s->mv_type = MV_TYPE_16X16;
883 } else {
884 s->mv_type = MV_TYPE_FIELD;
885 mb_type |= MB_TYPE_INTERLACED;
886 s->field_select[0][0] = s->picture_structure - 1;
887 }
888
889 if (IS_QUANT(mb_type))
890 s->qscale = get_qscale(s);
891
892 s->last_mv[0][0][0] = 0;
893 s->last_mv[0][0][1] = 0;
894 s->last_mv[0][1][0] = 0;
895 s->last_mv[0][1][1] = 0;
896 s->mv[0][0][0] = 0;
897 s->mv[0][0][1] = 0;
898 } else {
899 assert(mb_type & MB_TYPE_L0L1);
900 // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
901 /* get additional motion vector type */
902 if (s->frame_pred_frame_dct) {
903 motion_type = MT_FRAME;
904 } else {
905 motion_type = get_bits(&s->gb, 2);
906 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
907 s->interlaced_dct = get_bits1(&s->gb);
908 }
909
910 if (IS_QUANT(mb_type))
911 s->qscale = get_qscale(s);
912
913 /* motion vectors */
914 s->mv_dir = (mb_type >> 13) & 3;
915 ff_dlog(s->avctx, "motion_type=%d\n", motion_type);
916 switch (motion_type) {
917 case MT_FRAME: /* or MT_16X8 */
918 if (s->picture_structure == PICT_FRAME) {
919 mb_type |= MB_TYPE_16x16;
920 s->mv_type = MV_TYPE_16X16;
921 for (i = 0; i < 2; i++) {
922 if (USES_LIST(mb_type, i)) {
923 /* MT_FRAME */
924 s->mv[i][0][0] =
925 s->last_mv[i][0][0] =
926 s->last_mv[i][1][0] =
927 mpeg_decode_motion(s, s->mpeg_f_code[i][0],
928 s->last_mv[i][0][0]);
929 s->mv[i][0][1] =
930 s->last_mv[i][0][1] =
931 s->last_mv[i][1][1] =
932 mpeg_decode_motion(s, s->mpeg_f_code[i][1],
933 s->last_mv[i][0][1]);
934 /* full_pel: only for MPEG-1 */
935 if (s->full_pel[i]) {
936 s->mv[i][0][0] <<= 1;
937 s->mv[i][0][1] <<= 1;
938 }
939 }
940 }
941 } else {
942 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
943 s->mv_type = MV_TYPE_16X8;
944 for (i = 0; i < 2; i++) {
945 if (USES_LIST(mb_type, i)) {
946 /* MT_16X8 */
947 for (j = 0; j < 2; j++) {
948 s->field_select[i][j] = get_bits1(&s->gb);
949 for (k = 0; k < 2; k++) {
950 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
951 s->last_mv[i][j][k]);
952 s->last_mv[i][j][k] = val;
953 s->mv[i][j][k] = val;
954 }
955 }
956 }
957 }
958 }
959 break;
960 case MT_FIELD:
961 s->mv_type = MV_TYPE_FIELD;
962 if (s->picture_structure == PICT_FRAME) {
963 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
964 for (i = 0; i < 2; i++) {
965 if (USES_LIST(mb_type, i)) {
966 for (j = 0; j < 2; j++) {
967 s->field_select[i][j] = get_bits1(&s->gb);
968 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
969 s->last_mv[i][j][0]);
970 s->last_mv[i][j][0] = val;
971 s->mv[i][j][0] = val;
972 ff_dlog(s->avctx, "fmx=%d\n", val);
973 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
974 s->last_mv[i][j][1] >> 1);
975 s->last_mv[i][j][1] = val << 1;
976 s->mv[i][j][1] = val;
977 ff_dlog(s->avctx, "fmy=%d\n", val);
978 }
979 }
980 }
981 } else {
982 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
983 for (i = 0; i < 2; i++) {
984 if (USES_LIST(mb_type, i)) {
985 s->field_select[i][0] = get_bits1(&s->gb);
986 for (k = 0; k < 2; k++) {
987 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
988 s->last_mv[i][0][k]);
989 s->last_mv[i][0][k] = val;
990 s->last_mv[i][1][k] = val;
991 s->mv[i][0][k] = val;
992 }
993 }
994 }
995 }
996 break;
997 case MT_DMV:
998 s->mv_type = MV_TYPE_DMV;
999 for (i = 0; i < 2; i++) {
1000 if (USES_LIST(mb_type, i)) {
1001 int dmx, dmy, mx, my, m;
1002 const int my_shift = s->picture_structure == PICT_FRAME;
1003
1004 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1005 s->last_mv[i][0][0]);
1006 s->last_mv[i][0][0] = mx;
1007 s->last_mv[i][1][0] = mx;
1008 dmx = get_dmv(s);
1009 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1010 s->last_mv[i][0][1] >> my_shift);
1011 dmy = get_dmv(s);
1012
1013
1014 s->last_mv[i][0][1] = my << my_shift;
1015 s->last_mv[i][1][1] = my << my_shift;
1016
1017 s->mv[i][0][0] = mx;
1018 s->mv[i][0][1] = my;
1019 s->mv[i][1][0] = mx; // not used
1020 s->mv[i][1][1] = my; // not used
1021
1022 if (s->picture_structure == PICT_FRAME) {
1023 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1024
1025 // m = 1 + 2 * s->top_field_first;
1026 m = s->top_field_first ? 1 : 3;
1027
1028 /* top -> top pred */
1029 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1030 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1031 m = 4 - m;
1032 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1033 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1034 } else {
1035 mb_type |= MB_TYPE_16x16;
1036
1037 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1038 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1039 if (s->picture_structure == PICT_TOP_FIELD)
1040 s->mv[i][2][1]--;
1041 else
1042 s->mv[i][2][1]++;
1043 }
1044 }
1045 }
1046 break;
1047 default:
1048 av_log(s->avctx, AV_LOG_ERROR,
1049 "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1050 return AVERROR_INVALIDDATA;
1051 }
1052 }
1053
1054 s->mb_intra = 0;
1055 if (HAS_CBP(mb_type)) {
1056 s->bdsp.clear_blocks(s->block[0]);
1057
1058 cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1059 if (mb_block_count > 6) {
1060 cbp <<= mb_block_count - 6;
1061 cbp |= get_bits(&s->gb, mb_block_count - 6);
1062 s->bdsp.clear_blocks(s->block[6]);
1063 }
1064 if (cbp <= 0) {
1065 av_log(s->avctx, AV_LOG_ERROR,
1066 "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1067 return AVERROR_INVALIDDATA;
1068 }
1069
1070 #if FF_API_XVMC
1071 FF_DISABLE_DEPRECATION_WARNINGS
1072 // if 1, we memcpy blocks in xvmcvideo
1073 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1074 ff_xvmc_pack_pblocks(s, cbp);
1075 FF_ENABLE_DEPRECATION_WARNINGS
1076 #endif /* FF_API_XVMC */
1077
1078 if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1079 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1080 for (i = 0; i < 6; i++) {
1081 if (cbp & 32)
1082 mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1083 else
1084 s->block_last_index[i] = -1;
1085 cbp += cbp;
1086 }
1087 } else {
1088 cbp <<= 12 - mb_block_count;
1089
1090 for (i = 0; i < mb_block_count; i++) {
1091 if (cbp & (1 << 11)) {
1092 if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1093 return ret;
1094 } else {
1095 s->block_last_index[i] = -1;
1096 }
1097 cbp += cbp;
1098 }
1099 }
1100 } else {
1101 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1102 for (i = 0; i < 6; i++) {
1103 if (cbp & 32)
1104 mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1105 else
1106 s->block_last_index[i] = -1;
1107 cbp += cbp;
1108 }
1109 } else {
1110 for (i = 0; i < 6; i++) {
1111 if (cbp & 32) {
1112 if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1113 return ret;
1114 } else {
1115 s->block_last_index[i] = -1;
1116 }
1117 cbp += cbp;
1118 }
1119 }
1120 }
1121 } else {
1122 for (i = 0; i < 12; i++)
1123 s->block_last_index[i] = -1;
1124 }
1125 }
1126
1127 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1128
1129 return 0;
1130 }
1131
1132 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1133 {
1134 Mpeg1Context *s = avctx->priv_data;
1135 MpegEncContext *s2 = &s->mpeg_enc_ctx;
1136
1137 ff_mpv_decode_defaults(s2);
1138
1139 s->mpeg_enc_ctx.avctx = avctx;
1140
1141 /* we need some permutation to store matrices,
1142 * until the decoder sets the real permutation. */
1143 ff_mpv_idct_init(s2);
1144 ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1145 ff_mpeg12_init_vlcs();
1146
1147 s->mpeg_enc_ctx_allocated = 0;
1148 s->mpeg_enc_ctx.picture_number = 0;
1149 s->repeat_field = 0;
1150 s->mpeg_enc_ctx.codec_id = avctx->codec->id;
1151 avctx->color_range = AVCOL_RANGE_MPEG;
1152 if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1153 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1154 else
1155 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1156 return 0;
1157 }
1158
1159 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1160 const AVCodecContext *avctx_from)
1161 {
1162 Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1163 MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1164 int err;
1165
1166 if (avctx == avctx_from ||
1167 !ctx_from->mpeg_enc_ctx_allocated ||
1168 !s1->context_initialized)
1169 return 0;
1170
1171 err = ff_mpeg_update_thread_context(avctx, avctx_from);
1172 if (err)
1173 return err;
1174
1175 if (!ctx->mpeg_enc_ctx_allocated) {
1176 // copy the whole context after the initial MpegEncContext structure
1177 memcpy(ctx, ctx_from, sizeof(*ctx));
1178 memset(&ctx->mpeg_enc_ctx, 0, sizeof(ctx->mpeg_enc_ctx));
1179 }
1180
1181 if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1182 s->picture_number++;
1183
1184 return 0;
1185 }
1186
1187 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1188 const uint8_t *new_perm)
1189 {
1190 uint16_t temp_matrix[64];
1191 int i;
1192
1193 memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1194
1195 for (i = 0; i < 64; i++)
1196 matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1197 }
1198
1199 #if FF_API_XVMC
1200 static const enum AVPixelFormat pixfmt_xvmc_mpg2_420[] = {
1201 AV_PIX_FMT_XVMC_MPEG2_IDCT,
1202 AV_PIX_FMT_XVMC_MPEG2_MC,
1203 AV_PIX_FMT_NONE
1204 };
1205 #endif /* FF_API_XVMC */
1206
1207 static const enum AVPixelFormat mpeg12_hwaccel_pixfmt_list_420[] = {
1208 #if CONFIG_MPEG2_DXVA2_HWACCEL
1209 AV_PIX_FMT_DXVA2_VLD,
1210 #endif
1211 #if CONFIG_MPEG2_D3D11VA_HWACCEL
1212 AV_PIX_FMT_D3D11VA_VLD,
1213 #endif
1214 #if CONFIG_MPEG2_VAAPI_HWACCEL
1215 AV_PIX_FMT_VAAPI_VLD,
1216 #endif
1217 #if CONFIG_MPEG1_VDPAU_HWACCEL | CONFIG_MPEG2_VDPAU_HWACCEL
1218 AV_PIX_FMT_VDPAU,
1219 #endif
1220 AV_PIX_FMT_YUV420P,
1221 AV_PIX_FMT_NONE
1222 };
1223
1224 static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1225 AV_PIX_FMT_YUV422P,
1226 AV_PIX_FMT_NONE
1227 };
1228
1229 static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1230 AV_PIX_FMT_YUV444P,
1231 AV_PIX_FMT_NONE
1232 };
1233
1234 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1235 {
1236 Mpeg1Context *s1 = avctx->priv_data;
1237 MpegEncContext *s = &s1->mpeg_enc_ctx;
1238 const enum AVPixelFormat *pix_fmts;
1239
1240 #if FF_API_XVMC
1241 FF_DISABLE_DEPRECATION_WARNINGS
1242 if (avctx->xvmc_acceleration)
1243 return ff_get_format(avctx, pixfmt_xvmc_mpg2_420);
1244 FF_ENABLE_DEPRECATION_WARNINGS
1245 #endif /* FF_API_XVMC */
1246
1247 if (s->chroma_format < 2)
1248 pix_fmts = mpeg12_hwaccel_pixfmt_list_420;
1249 else if (s->chroma_format == 2)
1250 pix_fmts = mpeg12_pixfmt_list_422;
1251 else
1252 pix_fmts = mpeg12_pixfmt_list_444;
1253
1254 return ff_get_format(avctx, pix_fmts);
1255 }
1256
1257 /* Call this function when we know all parameters.
1258 * It may be called in different places for MPEG-1 and MPEG-2. */
1259 static int mpeg_decode_postinit(AVCodecContext *avctx)
1260 {
1261 Mpeg1Context *s1 = avctx->priv_data;
1262 MpegEncContext *s = &s1->mpeg_enc_ctx;
1263 uint8_t old_permutation[64];
1264 int ret;
1265
1266 if ((s1->mpeg_enc_ctx_allocated == 0) ||
1267 avctx->coded_width != s->width ||
1268 avctx->coded_height != s->height ||
1269 s1->save_width != s->width ||
1270 s1->save_height != s->height ||
1271 s1->save_aspect_info != s->aspect_ratio_info ||
1272 s1->save_progressive_seq != s->progressive_sequence ||
1273 0) {
1274 if (s1->mpeg_enc_ctx_allocated) {
1275 ParseContext pc = s->parse_context;
1276 s->parse_context.buffer = 0;
1277 ff_mpv_common_end(s);
1278 s->parse_context = pc;
1279 }
1280
1281 ret = ff_set_dimensions(avctx, s->width, s->height);
1282 if (ret < 0)
1283 return ret;
1284
1285 avctx->bit_rate = s->bit_rate;
1286 s1->save_aspect_info = s->aspect_ratio_info;
1287 s1->save_width = s->width;
1288 s1->save_height = s->height;
1289 s1->save_progressive_seq = s->progressive_sequence;
1290
1291 /* low_delay may be forced, in this case we will have B-frames
1292 * that behave like P-frames. */
1293 avctx->has_b_frames = !s->low_delay;
1294
1295 if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1296 // MPEG-1 fps
1297 avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1298 // MPEG-1 aspect
1299 avctx->sample_aspect_ratio = av_d2q(1.0 / ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1300 avctx->ticks_per_frame = 1;
1301 } else { // MPEG-2
1302 // MPEG-2 fps
1303 av_reduce(&s->avctx->framerate.num,
1304 &s->avctx->framerate.den,
1305 ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num * 2,
1306 ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1307 1 << 30);
1308 avctx->ticks_per_frame = 2;
1309 // MPEG-2 aspect
1310 if (s->aspect_ratio_info > 1) {
1311 AVRational dar =
1312 av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1313 (AVRational) { s1->pan_scan.width,
1314 s1->pan_scan.height }),
1315 (AVRational) { s->width, s->height });
1316
1317 /* We ignore the spec here and guess a bit as reality does not
1318 * match the spec, see for example res_change_ffmpeg_aspect.ts
1319 * and sequence-display-aspect.mpg.
1320 * issue1613, 621, 562 */
1321 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1322 (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1323 av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1324 s->avctx->sample_aspect_ratio =
1325 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1326 (AVRational) { s->width, s->height });
1327 } else {
1328 s->avctx->sample_aspect_ratio =
1329 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1330 (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1331 // issue1613 4/3 16/9 -> 16/9
1332 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1333 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1334 // s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1335 ff_dlog(avctx, "A %d/%d\n",
1336 ff_mpeg2_aspect[s->aspect_ratio_info].num,
1337 ff_mpeg2_aspect[s->aspect_ratio_info].den);
1338 ff_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1339 s->avctx->sample_aspect_ratio.den);
1340 }
1341 } else {
1342 s->avctx->sample_aspect_ratio =
1343 ff_mpeg2_aspect[s->aspect_ratio_info];
1344 }
1345 } // MPEG-2
1346
1347 ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
1348
1349 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1350 // until then pix_fmt may be changed right after codec init
1351 #if FF_API_XVMC
1352 if ((avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT ||
1353 avctx->hwaccel) && avctx->idct_algo == FF_IDCT_AUTO)
1354 #else
1355 if (avctx->hwaccel && avctx->idct_algo == FF_IDCT_AUTO)
1356 #endif /* FF_API_XVMC */
1357 avctx->idct_algo = FF_IDCT_SIMPLE;
1358
1359 /* Quantization matrices may need reordering
1360 * if DCT permutation is changed. */
1361 memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1362
1363 ff_mpv_idct_init(s);
1364 if ((ret = ff_mpv_common_init(s)) < 0)
1365 return ret;
1366
1367 quant_matrix_rebuild(s->intra_matrix, old_permutation, s->idsp.idct_permutation);
1368 quant_matrix_rebuild(s->inter_matrix, old_permutation, s->idsp.idct_permutation);
1369 quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1370 quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1371
1372 s1->mpeg_enc_ctx_allocated = 1;
1373 }
1374 return 0;
1375 }
1376
1377 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1378 int buf_size)
1379 {
1380 Mpeg1Context *s1 = avctx->priv_data;
1381 MpegEncContext *s = &s1->mpeg_enc_ctx;
1382 int ref, f_code, vbv_delay;
1383
1384 init_get_bits(&s->gb, buf, buf_size * 8);
1385
1386 ref = get_bits(&s->gb, 10); /* temporal ref */
1387 s->pict_type = get_bits(&s->gb, 3);
1388 if (s->pict_type == 0 || s->pict_type > 3)
1389 return AVERROR_INVALIDDATA;
1390
1391 vbv_delay = get_bits(&s->gb, 16);
1392 if (s->pict_type == AV_PICTURE_TYPE_P ||
1393 s->pict_type == AV_PICTURE_TYPE_B) {
1394 s->full_pel[0] = get_bits1(&s->gb);
1395 f_code = get_bits(&s->gb, 3);
1396 if (f_code == 0 && (avctx->err_recognition & AV_EF_BITSTREAM))
1397 return AVERROR_INVALIDDATA;
1398 s->mpeg_f_code[0][0] = f_code;
1399 s->mpeg_f_code[0][1] = f_code;
1400 }
1401 if (s->pict_type == AV_PICTURE_TYPE_B) {
1402 s->full_pel[1] = get_bits1(&s->gb);
1403 f_code = get_bits(&s->gb, 3);
1404 if (f_code == 0 && (avctx->err_recognition & AV_EF_BITSTREAM))
1405 return AVERROR_INVALIDDATA;
1406 s->mpeg_f_code[1][0] = f_code;
1407 s->mpeg_f_code[1][1] = f_code;
1408 }
1409 s->current_picture.f->pict_type = s->pict_type;
1410 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1411
1412 if (avctx->debug & FF_DEBUG_PICT_INFO)
1413 av_log(avctx, AV_LOG_DEBUG,
1414 "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1415
1416 s->y_dc_scale = 8;
1417 s->c_dc_scale = 8;
1418 return 0;
1419 }
1420
1421 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1422 {
1423 MpegEncContext *s = &s1->mpeg_enc_ctx;
1424 int horiz_size_ext, vert_size_ext;
1425 int bit_rate_ext;
1426
1427 skip_bits(&s->gb, 1); /* profile and level esc*/
1428 s->avctx->profile = get_bits(&s->gb, 3);
1429 s->avctx->level = get_bits(&s->gb, 4);
1430 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1431 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1432 horiz_size_ext = get_bits(&s->gb, 2);
1433 vert_size_ext = get_bits(&s->gb, 2);
1434 s->width |= (horiz_size_ext << 12);
1435 s->height |= (vert_size_ext << 12);
1436 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1437 s->bit_rate += (bit_rate_ext << 18) * 400;
1438 skip_bits1(&s->gb); /* marker */
1439 s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1440
1441 s->low_delay = get_bits1(&s->gb);
1442 if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
1443 s->low_delay = 1;
1444
1445 s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1446 s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1447
1448 ff_dlog(s->avctx, "sequence extension\n");
1449 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1450
1451 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1452 av_log(s->avctx, AV_LOG_DEBUG,
1453 "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1454 s->avctx->profile, s->avctx->level,
1455 s->avctx->rc_buffer_size, s->bit_rate);
1456 }
1457
1458 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1459 {
1460 MpegEncContext *s = &s1->mpeg_enc_ctx;
1461 int color_description, w, h;
1462
1463 skip_bits(&s->gb, 3); /* video format */
1464 color_description = get_bits1(&s->gb);
1465 if (color_description) {
1466 s->avctx->color_primaries = get_bits(&s->gb, 8);
1467 s->avctx->color_trc = get_bits(&s->gb, 8);
1468 s->avctx->colorspace = get_bits(&s->gb, 8);
1469 }
1470 w = get_bits(&s->gb, 14);
1471 skip_bits(&s->gb, 1); // marker
1472 h = get_bits(&s->gb, 14);
1473 // remaining 3 bits are zero padding
1474
1475 s1->pan_scan.width = 16 * w;
1476 s1->pan_scan.height = 16 * h;
1477
1478 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1479 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1480 }
1481
1482 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1483 {
1484 MpegEncContext *s = &s1->mpeg_enc_ctx;
1485 int i, nofco;
1486
1487 nofco = 1;
1488 if (s->progressive_sequence) {
1489 if (s->repeat_first_field) {
1490 nofco++;
1491 if (s->top_field_first)
1492 nofco++;
1493 }
1494 } else {
1495 if (s->picture_structure == PICT_FRAME) {
1496 nofco++;
1497 if (s->repeat_first_field)
1498 nofco++;
1499 }
1500 }
1501 for (i = 0; i < nofco; i++) {
1502 s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1503 skip_bits(&s->gb, 1); // marker
1504 s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1505 skip_bits(&s->gb, 1); // marker
1506 }
1507
1508 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1509 av_log(s->avctx, AV_LOG_DEBUG,
1510 "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1511 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1512 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1513 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1514 }
1515
1516 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1517 uint16_t matrix1[64], int intra)
1518 {
1519 int i;
1520
1521 for (i = 0; i < 64; i++) {
1522 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1523 int v = get_bits(&s->gb, 8);
1524 if (v == 0) {
1525 av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1526 return AVERROR_INVALIDDATA;
1527 }
1528 if (intra && i == 0 && v != 8) {
1529 av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
1530 v = 8; // needed by pink.mpg / issue1046
1531 }
1532 matrix0[j] = v;
1533 if (matrix1)
1534 matrix1[j] = v;
1535 }
1536 return 0;
1537 }
1538
1539 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1540 {
1541 ff_dlog(s->avctx, "matrix extension\n");
1542
1543 if (get_bits1(&s->gb))
1544 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1545 if (get_bits1(&s->gb))
1546 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1547 if (get_bits1(&s->gb))
1548 load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1549 if (get_bits1(&s->gb))
1550 load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1551 }
1552
1553 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1554 {
1555 MpegEncContext *s = &s1->mpeg_enc_ctx;
1556
1557 s->full_pel[0] = s->full_pel[1] = 0;
1558 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1559 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1560 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1561 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1562 if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1563 av_log(s->avctx, AV_LOG_ERROR,
1564 "Missing picture start code, guessing missing values\n");
1565 if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1566 if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1567 s->pict_type = AV_PICTURE_TYPE_I;
1568 else
1569 s->pict_type = AV_PICTURE_TYPE_P;
1570 } else
1571 s->pict_type = AV_PICTURE_TYPE_B;
1572 s->current_picture.f->pict_type = s->pict_type;
1573 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1574 }
1575 s->intra_dc_precision = get_bits(&s->gb, 2);
1576 s->picture_structure = get_bits(&s->gb, 2);
1577 s->top_field_first = get_bits1(&s->gb);
1578 s->frame_pred_frame_dct = get_bits1(&s->gb);
1579 s->concealment_motion_vectors = get_bits1(&s->gb);
1580 s->q_scale_type = get_bits1(&s->gb);
1581 s->intra_vlc_format = get_bits1(&s->gb);
1582 s->alternate_scan = get_bits1(&s->gb);
1583 s->repeat_first_field = get_bits1(&s->gb);
1584 s->chroma_420_type = get_bits1(&s->gb);
1585 s->progressive_frame = get_bits1(&s->gb);
1586
1587 if (s->progressive_sequence && !s->progressive_frame) {
1588 s->progressive_frame = 1;
1589 av_log(s->avctx, AV_LOG_ERROR,
1590 "interlaced frame in progressive sequence, ignoring\n");
1591 }
1592
1593 if (s->picture_structure == 0 ||
1594 (s->progressive_frame && s->picture_structure != PICT_FRAME)) {
1595 av_log(s->avctx, AV_LOG_ERROR,
1596 "picture_structure %d invalid, ignoring\n",
1597 s->picture_structure);
1598 s->picture_structure = PICT_FRAME;
1599 }
1600
1601 if (s->progressive_sequence && !s->frame_pred_frame_dct)
1602 av_log(s->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
1603
1604 if (s->picture_structure == PICT_FRAME) {
1605 s->first_field = 0;
1606 s->v_edge_pos = 16 * s->mb_height;
1607 } else {
1608 s->first_field ^= 1;
1609 s->v_edge_pos = 8 * s->mb_height;
1610 memset(s->mbskip_table, 0, s->mb_stride * s->mb_height);
1611 }
1612
1613 if (s->alternate_scan) {
1614 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1615 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1616 } else {
1617 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1618 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1619 }
1620
1621 /* composite display not parsed */
1622 ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1623 ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1624 ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1625 ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1626 ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1627 ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1628 ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1629 ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1630 ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1631 }
1632
1633 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1634 {
1635 AVCodecContext *avctx = s->avctx;
1636 Mpeg1Context *s1 = (Mpeg1Context *) s;
1637 int ret;
1638
1639 /* start frame decoding */
1640 if (s->first_field || s->picture_structure == PICT_FRAME) {
1641 AVFrameSideData *pan_scan;
1642
1643 if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1644 return ret;
1645
1646 ff_mpeg_er_frame_start(s);
1647
1648 /* first check if we must repeat the frame */
1649 s->current_picture_ptr->f->repeat_pict = 0;
1650 if (s->repeat_first_field) {
1651 if (s->progressive_sequence) {
1652 if (s->top_field_first)
1653 s->current_picture_ptr->f->repeat_pict = 4;
1654 else
1655 s->current_picture_ptr->f->repeat_pict = 2;
1656 } else if (s->progressive_frame) {
1657 s->current_picture_ptr->f->repeat_pict = 1;
1658 }
1659 }
1660
1661 pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1662 AV_FRAME_DATA_PANSCAN,
1663 sizeof(s1->pan_scan));
1664 if (!pan_scan)
1665 return AVERROR(ENOMEM);
1666 memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1667
1668 if (s1->a53_caption) {
1669 AVFrameSideData *sd = av_frame_new_side_data(
1670 s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1671 s1->a53_caption_size);
1672 if (sd)
1673 memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1674 av_freep(&s1->a53_caption);
1675 }
1676
1677 if (s1->has_stereo3d) {
1678 AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1679 if (!stereo)
1680 return AVERROR(ENOMEM);
1681
1682 *stereo = s1->stereo3d;
1683 s1->has_stereo3d = 0;
1684 }
1685
1686 if (s1->has_afd) {
1687 AVFrameSideData *sd =
1688 av_frame_new_side_data(s->current_picture_ptr->f,
1689 AV_FRAME_DATA_AFD, 1);
1690 if (!sd)
1691 return AVERROR(ENOMEM);
1692
1693 *sd->data = s1->afd;
1694 s1->has_afd = 0;
1695 }
1696
1697 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1698 ff_thread_finish_setup(avctx);
1699 } else { // second field
1700 int i;
1701
1702 if (!s->current_picture_ptr) {
1703 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1704 return AVERROR_INVALIDDATA;
1705 }
1706
1707 if (s->avctx->hwaccel &&
1708 (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1709 if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1710 av_log(avctx, AV_LOG_ERROR,
1711 "hardware accelerator failed to decode first field\n");
1712 }
1713
1714 for (i = 0; i < 4; i++) {
1715 s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1716 if (s->picture_structure == PICT_BOTTOM_FIELD)
1717 s->current_picture.f->data[i] +=
1718 s->current_picture_ptr->f->linesize[i];
1719 }
1720 }
1721
1722 if (avctx->hwaccel) {
1723 if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1724 return ret;
1725 }
1726
1727 #if FF_API_XVMC
1728 FF_DISABLE_DEPRECATION_WARNINGS
1729 // ff_mpv_frame_start will call this function too,
1730 // but we need to call it on every field
1731 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1732 if (ff_xvmc_field_start(s, avctx) < 0)
1733 return -1;
1734 FF_ENABLE_DEPRECATION_WARNINGS
1735 #endif /* FF_API_XVMC */
1736
1737 return 0;
1738 }
1739
1740 #define DECODE_SLICE_ERROR -1
1741 #define DECODE_SLICE_OK 0
1742
1743 /**
1744 * Decode a slice.
1745 * MpegEncContext.mb_y must be set to the MB row from the startcode.
1746 * @return DECODE_SLICE_ERROR if the slice is damaged,
1747 * DECODE_SLICE_OK if this slice is OK
1748 */
1749 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1750 const uint8_t **buf, int buf_size)
1751 {
1752 AVCodecContext *avctx = s->avctx;
1753 const int field_pic = s->picture_structure != PICT_FRAME;
1754 int ret;
1755
1756 s->resync_mb_x =
1757 s->resync_mb_y = -1;
1758
1759 assert(mb_y < s->mb_height);
1760
1761 init_get_bits(&s->gb, *buf, buf_size * 8);
1762
1763 ff_mpeg1_clean_buffers(s);
1764 s->interlaced_dct = 0;
1765
1766 s->qscale = get_qscale(s);
1767
1768 if (s->qscale == 0) {
1769 av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1770 return AVERROR_INVALIDDATA;
1771 }
1772
1773 /* extra slice info */
1774 while (get_bits1(&s->gb) != 0)
1775 skip_bits(&s->gb, 8);
1776
1777 s->mb_x = 0;
1778
1779 if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1780 skip_bits1(&s->gb);
1781 } else {
1782 while (get_bits_left(&s->gb) > 0) {
1783 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1784 MBINCR_VLC_BITS, 2);
1785 if (code < 0) {
1786 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1787 return AVERROR_INVALIDDATA;
1788 }
1789 if (code >= 33) {
1790 if (code == 33)
1791 s->mb_x += 33;
1792 /* otherwise, stuffing, nothing to do */
1793 } else {
1794 s->mb_x += code;
1795 break;
1796 }
1797 }
1798 }
1799
1800 if (s->mb_x >= (unsigned) s->mb_width) {
1801 av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1802 return AVERROR_INVALIDDATA;
1803 }
1804
1805 if (avctx->hwaccel) {
1806 const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1807 int start_code = -1;
1808 buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1809 if (buf_end < *buf + buf_size)
1810 buf_end -= 4;
1811 s->mb_y = mb_y;
1812 if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1813 return DECODE_SLICE_ERROR;
1814 *buf = buf_end;
1815 return DECODE_SLICE_OK;
1816 }
1817
1818 s->resync_mb_x = s->mb_x;
1819 s->resync_mb_y = s->mb_y = mb_y;
1820 s->mb_skip_run = 0;
1821 ff_init_block_index(s);
1822
1823 if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1824 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1825 av_log(s->avctx, AV_LOG_DEBUG,
1826 "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",
1827 s->qscale,
1828 s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1829 s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1830 s->pict_type == AV_PICTURE_TYPE_I ? "I" :
1831 (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1832 (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1833 s->progressive_sequence ? "ps" : "",
1834 s->progressive_frame ? "pf" : "",
1835 s->alternate_scan ? "alt" : "",
1836 s->top_field_first ? "top" : "",
1837 s->intra_dc_precision, s->picture_structure,
1838 s->frame_pred_frame_dct, s->concealment_motion_vectors,
1839 s->q_scale_type, s->intra_vlc_format,
1840 s->repeat_first_field, s->chroma_420_type ? "420" : "");
1841 }
1842 }
1843
1844 for (;;) {
1845 #if FF_API_XVMC
1846 FF_DISABLE_DEPRECATION_WARNINGS
1847 // If 1, we memcpy blocks in xvmcvideo.
1848 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1849 ff_xvmc_init_block(s); // set s->block
1850 FF_ENABLE_DEPRECATION_WARNINGS
1851 #endif /* FF_API_XVMC */
1852
1853 if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1854 return ret;
1855
1856 // Note motion_val is normally NULL unless we want to extract the MVs.
1857 if (s->current_picture.motion_val[0] && !s->encoding) {
1858 const int wrap = s->b8_stride;
1859 int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1860 int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1861 int motion_x, motion_y, dir, i;
1862
1863 for (i = 0; i < 2; i++) {
1864 for (dir = 0; dir < 2; dir++) {
1865 if (s->mb_intra ||
1866 (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1867 motion_x = motion_y = 0;
1868 } else if (s->mv_type == MV_TYPE_16X16 ||
1869 (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1870 motion_x = s->mv[dir][0][0];
1871 motion_y = s->mv[dir][0][1];
1872 } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1873 motion_x = s->mv[dir][i][0];
1874 motion_y = s->mv[dir][i][1];
1875 }
1876
1877 s->current_picture.motion_val[dir][xy][0] = motion_x;
1878 s->current_picture.motion_val[dir][xy][1] = motion_y;
1879 s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1880 s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1881 s->current_picture.ref_index [dir][b8_xy] =
1882 s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1883 assert(s->field_select[dir][i] == 0 ||
1884 s->field_select[dir][i] == 1);
1885 }
1886 xy += wrap;
1887 b8_xy += 2;
1888 }
1889 }
1890
1891 s->dest[0] += 16;
1892 s->dest[1] += 16 >> s->chroma_x_shift;
1893 s->dest[2] += 16 >> s->chroma_x_shift;
1894
1895 ff_mpv_decode_mb(s, s->block);
1896
1897 if (++s->mb_x >= s->mb_width) {
1898 const int mb_size = 16;
1899
1900 ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1901 ff_mpv_report_decode_progress(s);
1902
1903 s->mb_x = 0;
1904 s->mb_y += 1 << field_pic;
1905
1906 if (s->mb_y >= s->mb_height) {
1907 int left = get_bits_left(&s->gb);
1908 int is_d10 = s->chroma_format == 2 &&
1909 s->pict_type == AV_PICTURE_TYPE_I &&
1910 avctx->profile == 0 && avctx->level == 5 &&
1911 s->intra_dc_precision == 2 &&
1912 s->q_scale_type == 1 && s->alternate_scan == 0 &&
1913 s->progressive_frame == 0
1914 /* vbv_delay == 0xBBB || 0xE10 */;
1915
1916 if (left < 0 ||
1917 (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1918 ((avctx->err_recognition & AV_EF_BUFFER) && left > 8)) {
1919 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
1920 left, show_bits(&s->gb, FFMIN(left, 23)));
1921 return AVERROR_INVALIDDATA;
1922 } else
1923 goto eos;
1924 }
1925
1926 ff_init_block_index(s);
1927 }
1928
1929 /* skip mb handling */
1930 if (s->mb_skip_run == -1) {
1931 /* read increment again */
1932 s->mb_skip_run = 0;
1933 for (;;) {
1934 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1935 MBINCR_VLC_BITS, 2);
1936 if (code < 0) {
1937 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1938 return AVERROR_INVALIDDATA;
1939 }
1940 if (code >= 33) {
1941 if (code == 33) {
1942 s->mb_skip_run += 33;
1943 } else if (code == 35) {
1944 if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1945 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1946 return AVERROR_INVALIDDATA;
1947 }
1948 goto eos; /* end of slice */
1949 }
1950 /* otherwise, stuffing, nothing to do */
1951 } else {
1952 s->mb_skip_run += code;
1953 break;
1954 }
1955 }
1956 if (s->mb_skip_run) {
1957 int i;
1958 if (s->pict_type == AV_PICTURE_TYPE_I) {
1959 av_log(s->avctx, AV_LOG_ERROR,
1960 "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1961 return AVERROR_INVALIDDATA;
1962 }
1963
1964 /* skip mb */
1965 s->mb_intra = 0;
1966 for (i = 0; i < 12; i++)
1967 s->block_last_index[i] = -1;
1968 if (s->picture_structure == PICT_FRAME)
1969 s->mv_type = MV_TYPE_16X16;
1970 else
1971 s->mv_type = MV_TYPE_FIELD;
1972 if (s->pict_type == AV_PICTURE_TYPE_P) {
1973 /* if P type, zero motion vector is implied */
1974 s->mv_dir = MV_DIR_FORWARD;
1975 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1976 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1977 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1978 s->field_select[0][0] = (s->picture_structure - 1) & 1;
1979 } else {
1980 /* if B type, reuse previous vectors and directions */
1981 s->mv[0][0][0] = s->last_mv[0][0][0];
1982 s->mv[0][0][1] = s->last_mv[0][0][1];
1983 s->mv[1][0][0] = s->last_mv[1][0][0];
1984 s->mv[1][0][1] = s->last_mv[1][0][1];
1985 }
1986 }
1987 }
1988 }
1989 eos: // end of slice
1990 *buf += (get_bits_count(&s->gb) - 1) / 8;
1991 ff_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1992 return 0;
1993 }
1994
1995 static int slice_decode_thread(AVCodecContext *c, void *arg)
1996 {
1997 MpegEncContext *s = *(void **) arg;
1998 const uint8_t *buf = s->gb.buffer;
1999 int mb_y = s->start_mb_y;
2000 const int field_pic = s->picture_structure != PICT_FRAME;
2001
2002 s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
2003
2004 for (;;) {
2005 uint32_t start_code;
2006 int ret;
2007
2008 ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
2009 emms_c();
2010 ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2011 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
2012 s->start_mb_y, s->end_mb_y, s->er.error_count);
2013 if (ret < 0) {
2014 if (c->err_recognition & AV_EF_EXPLODE)
2015 return ret;
2016 if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2017 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2018 s->mb_x, s->mb_y,
2019 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2020 } else {
2021 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2022 s->mb_x - 1, s->mb_y,
2023 ER_AC_END | ER_DC_END | ER_MV_END);
2024 }
2025
2026 if (s->mb_y == s->end_mb_y)
2027 return 0;
2028
2029 start_code = -1;
2030 buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2031 mb_y = (start_code - SLICE_MIN_START_CODE) << field_pic;
2032 if (s->picture_structure == PICT_BOTTOM_FIELD)
2033 mb_y++;
2034 if (mb_y < 0 || mb_y >= s->end_mb_y)
2035 return AVERROR_INVALIDDATA;
2036 }
2037 }
2038
2039 /**
2040 * Handle slice ends.
2041 * @return 1 if it seems to be the last slice
2042 */
2043 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2044 {
2045 Mpeg1Context *s1 = avctx->priv_data;
2046 MpegEncContext *s = &s1->mpeg_enc_ctx;
2047
2048 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2049 return 0;
2050
2051 if (s->avctx->hwaccel) {
2052 if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
2053 av_log(avctx, AV_LOG_ERROR,
2054 "hardware accelerator failed to decode picture\n");
2055 }
2056
2057 #if FF_API_XVMC
2058 FF_DISABLE_DEPRECATION_WARNINGS
2059 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
2060 ff_xvmc_field_end(s);
2061 FF_ENABLE_DEPRECATION_WARNINGS
2062 #endif /* FF_API_XVMC */
2063
2064 /* end of slice reached */
2065 if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field) {
2066 /* end of image */
2067
2068 ff_er_frame_end(&s->er);
2069
2070 ff_mpv_frame_end(s);
2071
2072 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2073 int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2074 if (ret < 0)
2075 return ret;
2076 ff_print_debug_info(s, s->current_picture_ptr);
2077 } else {
2078 if (avctx->active_thread_type & FF_THREAD_FRAME)
2079 s->picture_number++;
2080 /* latency of 1 frame for I- and P-frames */
2081 /* XXX: use another variable than picture_number */
2082 if (s->last_picture_ptr) {
2083 int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2084 if (ret < 0)
2085 return ret;
2086 ff_print_debug_info(s, s->last_picture_ptr);
2087 }
2088 }
2089
2090 return 1;
2091 } else {
2092 return 0;
2093 }
2094 }
2095
2096 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2097 const uint8_t *buf, int buf_size)
2098 {
2099 Mpeg1Context *s1 = avctx->priv_data;
2100 MpegEncContext *s = &s1->mpeg_enc_ctx;
2101 int width, height;
2102 int i, v, j;
2103
2104 init_get_bits(&s->gb, buf, buf_size * 8);
2105
2106 width = get_bits(&s->gb, 12);
2107 height = get_bits(&s->gb, 12);
2108 if (width == 0 || height == 0) {
2109 av_log(avctx, AV_LOG_WARNING,
2110 "Invalid horizontal or vertical size value.\n");
2111 if (avctx->err_recognition & AV_EF_BITSTREAM)
2112 return AVERROR_INVALIDDATA;
2113 }
2114 s->aspect_ratio_info = get_bits(&s->gb, 4);
2115 if (s->aspect_ratio_info == 0) {
2116 av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2117 if (avctx->err_recognition & AV_EF_BITSTREAM)
2118 return AVERROR_INVALIDDATA;
2119 }
2120 s->frame_rate_index = get_bits(&s->gb, 4);
2121 if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2122 av_log(avctx, AV_LOG_WARNING,
2123 "frame_rate_index %d is invalid\n", s->frame_rate_index);
2124 return AVERROR_INVALIDDATA;
2125 }
2126 s->bit_rate = get_bits(&s->gb, 18) * 400;
2127 if (get_bits1(&s->gb) == 0) { /* marker */
2128 av_log(avctx, AV_LOG_ERROR, "Marker in sequence header missing\n");
2129 return AVERROR_INVALIDDATA;
2130 }
2131 s->width = width;
2132 s->height = height;
2133
2134 s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2135 skip_bits(&s->gb, 1);
2136
2137 /* get matrix */
2138 if (get_bits1(&s->gb)) {
2139 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2140 } else {
2141 for (i = 0; i < 64; i++) {
2142 j = s->idsp.idct_permutation[i];
2143 v = ff_mpeg1_default_intra_matrix[i];
2144 s->intra_matrix[j] = v;
2145 s->chroma_intra_matrix[j] = v;
2146 }
2147 }
2148 if (get_bits1(&s->gb)) {
2149 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2150 } else {
2151 for (i = 0; i < 64; i++) {
2152 int j = s->idsp.idct_permutation[i];
2153 v = ff_mpeg1_default_non_intra_matrix[i];
2154 s->inter_matrix[j] = v;
2155 s->chroma_inter_matrix[j] = v;
2156 }
2157 }
2158
2159 if (show_bits(&s->gb, 23) != 0) {
2160 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2161 return AVERROR_INVALIDDATA;
2162 }
2163
2164 /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2165 s->progressive_sequence = 1;
2166 s->progressive_frame = 1;
2167 s->picture_structure = PICT_FRAME;
2168 s->frame_pred_frame_dct = 1;
2169 s->chroma_format = 1;
2170 s->codec_id =
2171 s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2172 s->out_format = FMT_MPEG1;
2173 if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2174 s->low_delay = 1;
2175
2176 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2177 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2178 s->avctx->rc_buffer_size, s->bit_rate);
2179
2180 return 0;
2181 }
2182
2183 static int vcr2_init_sequence(AVCodecContext *avctx)
2184 {
2185 Mpeg1Context *s1 = avctx->priv_data;
2186 MpegEncContext *s = &s1->mpeg_enc_ctx;
2187 int i, v, ret;
2188
2189 /* start new MPEG-1 context decoding */
2190 s->out_format = FMT_MPEG1;
2191 if (s1->mpeg_enc_ctx_allocated) {
2192 ff_mpv_common_end(s);
2193 }
2194 s->width = avctx->coded_width;
2195 s->height = avctx->coded_height;
2196 avctx->has_b_frames = 0; // true?
2197 s->low_delay = 1;
2198
2199 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2200
2201 #if FF_API_XVMC
2202 if ((avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel) &&
2203 avctx->idct_algo == FF_IDCT_AUTO)
2204 #else
2205 if (avctx->hwaccel && avctx->idct_algo == FF_IDCT_AUTO)
2206 #endif /* FF_API_XVMC */
2207 avctx->idct_algo = FF_IDCT_SIMPLE;
2208
2209 ff_mpv_idct_init(s);
2210 if ((ret = ff_mpv_common_init(s)) < 0)
2211 return ret;
2212 s1->mpeg_enc_ctx_allocated = 1;
2213
2214 for (i = 0; i < 64; i++) {
2215 int j = s->idsp.idct_permutation[i];
2216 v = ff_mpeg1_default_intra_matrix[i];
2217 s->intra_matrix[j] = v;
2218 s->chroma_intra_matrix[j] = v;
2219
2220 v = ff_mpeg1_default_non_intra_matrix[i];
2221 s->inter_matrix[j] = v;
2222 s->chroma_inter_matrix[j] = v;
2223 }
2224
2225 s->progressive_sequence = 1;
2226 s->progressive_frame = 1;
2227 s->picture_structure = PICT_FRAME;
2228 s->frame_pred_frame_dct = 1;
2229 s->chroma_format = 1;
2230 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2231 s1->save_width = s->width;
2232 s1->save_height = s->height;
2233 s1->save_progressive_seq = s->progressive_sequence;
2234 return 0;
2235 }
2236
2237 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2238 const uint8_t *p, int buf_size)
2239 {
2240 Mpeg1Context *s1 = avctx->priv_data;
2241
2242 if (buf_size >= 6 &&
2243 p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2244 p[4] == 3 && (p[5] & 0x40)) {
2245 /* extract A53 Part 4 CC data */
2246 int cc_count = p[5] & 0x1f;
2247 if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2248 av_freep(&s1->a53_caption);
2249 s1->a53_caption_size = cc_count * 3;
2250 s1->a53_caption = av_malloc(s1->a53_caption_size);
2251 if (s1->a53_caption)
2252 memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2253 }
2254 return 1;
2255 } else if (buf_size >= 11 &&
2256 p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2257 /* extract DVD CC data */
2258 int cc_count = 0;
2259 int i;
2260 // There is a caption count field in the data, but it is often
2261 // incorect. So count the number of captions present.
2262 for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2263 cc_count++;
2264 // Transform the DVD format into A53 Part 4 format
2265 if (cc_count > 0) {
2266 av_freep(&s1->a53_caption);
2267 s1->a53_caption_size = cc_count * 6;
2268 s1->a53_caption = av_malloc(s1->a53_caption_size);
2269 if (s1->a53_caption) {
2270 uint8_t field1 = !!(p[4] & 0x80);
2271 uint8_t *cap = s1->a53_caption;
2272 p += 5;
2273 for (i = 0; i < cc_count; i++) {
2274 cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2275 cap[1] = p[1];
2276 cap[2] = p[2];
2277 cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2278 cap[4] = p[4];
2279 cap[5] = p[5];
2280 cap += 6;
2281 p += 6;
2282 }
2283 }
2284 }
2285 return 1;
2286 }
2287 return 0;
2288 }
2289
2290 static void mpeg_decode_user_data(AVCodecContext *avctx,
2291 const uint8_t *p, int buf_size)
2292 {
2293 const uint8_t *buf_end = p + buf_size;
2294 Mpeg1Context *s1 = avctx->priv_data;
2295
2296 /* we parse the DTG active format information */
2297 if (buf_end - p >= 5 &&
2298 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2299 int flags = p[4];
2300 p += 5;
2301 if (flags & 0x80) {
2302 /* skip event id */
2303 p += 2;
2304 }
2305 if (flags & 0x40) {
2306 if (buf_end - p < 1)
2307 return;
2308 #if FF_API_AFD
2309 FF_DISABLE_DEPRECATION_WARNINGS
2310 avctx->dtg_active_format = p[0] & 0x0f;
2311 FF_ENABLE_DEPRECATION_WARNINGS
2312 #endif /* FF_API_AFD */
2313 s1->has_afd = 1;
2314 s1->afd = p[0] & 0x0f;
2315 }
2316 } else if (buf_end - p >= 6 &&
2317 p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2318 p[4] == 0x03) { // S3D_video_format_length
2319 // the 0x7F mask ignores the reserved_bit value
2320 const uint8_t S3D_video_format_type = p[5] & 0x7F;
2321
2322 if (S3D_video_format_type == 0x03 ||
2323 S3D_video_format_type == 0x04 ||
2324 S3D_video_format_type == 0x08 ||
2325 S3D_video_format_type == 0x23) {
2326
2327 s1->has_stereo3d = 1;
2328
2329 switch (S3D_video_format_type) {
2330 case 0x03:
2331 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2332 break;
2333 case 0x04:
2334 s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2335 break;
2336 case 0x08:
2337 s1->stereo3d.type = AV_STEREO3D_2D;
2338 break;
2339 case 0x23:
2340 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2341 break;
2342 }
2343 }
2344 } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2345 return;
2346 }
2347 }
2348
2349 static void mpeg_decode_gop(AVCodecContext *avctx,
2350 const uint8_t *buf, int buf_size)
2351 {
2352 Mpeg1Context *s1 = avctx->priv_data;
2353 MpegEncContext *s = &s1->mpeg_enc_ctx;
2354
2355 int time_code_hours, time_code_minutes;
2356 int time_code_seconds, time_code_pictures;
2357 int broken_link;
2358
2359 init_get_bits(&s->gb, buf, buf_size * 8);
2360
2361 skip_bits1(&s->gb); /* drop_frame_flag */
2362
2363 time_code_hours = get_bits(&s->gb, 5);
2364 time_code_minutes = get_bits(&s->gb, 6);
2365 skip_bits1(&s->gb); // marker bit
2366 time_code_seconds = get_bits(&s->gb, 6);
2367 time_code_pictures = get_bits(&s->gb, 6);
2368
2369 s1->closed_gop = get_bits1(&s->gb);
2370 /* broken_link indicate that after editing the
2371 * reference frames of the first B-Frames after GOP I-Frame
2372 * are missing (open gop) */
2373 broken_link = get_bits1(&s->gb);
2374
2375 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2376 av_log(s->avctx, AV_LOG_DEBUG,
2377 "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2378 time_code_hours, time_code_minutes, time_code_seconds,
2379 time_code_pictures, s1->closed_gop, broken_link);
2380 }
2381
2382 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2383 int *got_output, const uint8_t *buf, int buf_size)
2384 {
2385 Mpeg1Context *s = avctx->priv_data;
2386 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2387 const uint8_t *buf_ptr = buf;
2388 const uint8_t *buf_end = buf + buf_size;
2389 int ret, input_size;
2390 int last_code = 0, skip_frame = 0;
2391
2392 for (;;) {
2393 /* find next start code */
2394 uint32_t start_code = -1;
2395 buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2396 if (start_code > 0x1ff) {
2397 if (!skip_frame) {
2398 if (HAVE_THREADS &&
2399 (avctx->active_thread_type & FF_THREAD_SLICE) &&
2400 !avctx->hwaccel) {
2401 int i;
2402
2403 avctx->execute(avctx, slice_decode_thread,
2404 &s2->thread_context[0], NULL,
2405 s->slice_count, sizeof(void *));
2406 for (i = 0; i < s->slice_count; i++)
2407 s2->er.error_count += s2->thread_context[i]->er.error_count;
2408 }
2409
2410 ret = slice_end(avctx, picture);
2411 if (ret < 0)
2412 return ret;
2413 else if (ret) {
2414 // FIXME: merge with the stuff in mpeg_decode_slice
2415 if (s2->last_picture_ptr || s2->low_delay)
2416 *got_output = 1;
2417 }
2418 }
2419 s2->pict_type = 0;
2420 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2421 }
2422
2423 input_size = buf_end - buf_ptr;
2424
2425 if (avctx->debug & FF_DEBUG_STARTCODE)
2426 av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %td left %d\n",
2427 start_code, buf_ptr - buf, input_size);
2428
2429 /* prepare data for next start code */
2430 switch (start_code) {
2431 case SEQ_START_CODE:
2432 if (last_code == 0) {
2433 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2434 s->sync = 1;
2435 } else {
2436 av_log(avctx, AV_LOG_ERROR,
2437 "ignoring SEQ_START_CODE after %X\n", last_code);
2438 if (avctx->err_recognition & AV_EF_EXPLODE)
2439 return AVERROR_INVALIDDATA;
2440 }
2441 break;
2442
2443 case PICTURE_START_CODE:
2444 if (s2->width <= 0 || s2->height <= 0) {
2445 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2446 s2->width, s2->height);
2447 return AVERROR_INVALIDDATA;
2448 }
2449
2450 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2451 !avctx->hwaccel && s->slice_count) {
2452 int i;
2453
2454 avctx->execute(avctx, slice_decode_thread,
2455 s2->thread_context, NULL,
2456 s->slice_count, sizeof(void *));
2457 for (i = 0; i < s->slice_count; i++)
2458 s2->er.error_count += s2->thread_context[i]->er.error_count;
2459 s->slice_count = 0;
2460 }
2461 if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2462 ret = mpeg_decode_postinit(avctx);
2463 if (ret < 0) {
2464 av_log(avctx, AV_LOG_ERROR,
2465 "mpeg_decode_postinit() failure\n");
2466 return ret;
2467 }
2468
2469 /* We have a complete image: we try to decompress it. */
2470 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2471 s2->pict_type = 0;
2472 s->first_slice = 1;
2473 last_code = PICTURE_START_CODE;
2474 } else {
2475 av_log(avctx, AV_LOG_ERROR,
2476 "ignoring pic after %X\n", last_code);
2477 if (avctx->err_recognition & AV_EF_EXPLODE)
2478 return AVERROR_INVALIDDATA;
2479 }
2480 break;
2481 case EXT_START_CODE:
2482 init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2483
2484 switch (get_bits(&s2->gb, 4)) {
2485 case 0x1:
2486 if (last_code == 0) {
2487 mpeg_decode_sequence_extension(s);
2488 } else {
2489 av_log(avctx, AV_LOG_ERROR,
2490 "ignoring seq ext after %X\n", last_code);
2491 if (avctx->err_recognition & AV_EF_EXPLODE)
2492 return AVERROR_INVALIDDATA;
2493 }
2494 break;
2495 case 0x2:
2496 mpeg_decode_sequence_display_extension(s);
2497 break;
2498 case 0x3:
2499 mpeg_decode_quant_matrix_extension(s2);
2500 break;
2501 case 0x7:
2502 mpeg_decode_picture_display_extension(s);
2503 break;
2504 case 0x8:
2505 if (last_code == PICTURE_START_CODE) {
2506 mpeg_decode_picture_coding_extension(s);
2507 } else {
2508 av_log(avctx, AV_LOG_ERROR,
2509 "ignoring pic cod ext after %X\n", last_code);
2510 if (avctx->err_recognition & AV_EF_EXPLODE)
2511 return AVERROR_INVALIDDATA;
2512 }
2513 break;
2514 }
2515 break;
2516 case USER_START_CODE:
2517 mpeg_decode_user_data(avctx, buf_ptr, input_size);
2518 break;
2519 case GOP_START_CODE:
2520 if (last_code == 0) {
2521 s2->first_field = 0;
2522 mpeg_decode_gop(avctx, buf_ptr, input_size);
2523 s->sync = 1;
2524 } else {
2525 av_log(avctx, AV_LOG_ERROR,
2526 "ignoring GOP_START_CODE after %X\n", last_code);
2527 if (avctx->err_recognition & AV_EF_EXPLODE)
2528 return AVERROR_INVALIDDATA;
2529 }
2530 break;
2531 default:
2532 if (start_code >= SLICE_MIN_START_CODE &&
2533 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2534 const int field_pic = s2->picture_structure != PICT_FRAME;
2535 int mb_y = (start_code - SLICE_MIN_START_CODE) << field_pic;
2536 last_code = SLICE_MIN_START_CODE;
2537
2538 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2539 mb_y++;
2540
2541 if (mb_y >= s2->mb_height) {
2542 av_log(s2->avctx, AV_LOG_ERROR,
2543 "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2544 return AVERROR_INVALIDDATA;
2545 }
2546
2547 if (!s2->last_picture_ptr) {
2548 /* Skip B-frames if we do not have reference frames and
2549 * GOP is not closed. */
2550 if (s2->pict_type == AV_PICTURE_TYPE_B) {
2551 if (!s->closed_gop) {
2552 skip_frame = 1;
2553 break;
2554 }
2555 }
2556 }
2557 if (s2->pict_type == AV_PICTURE_TYPE_I)
2558 s->sync = 1;
2559 if (!s2->next_picture_ptr) {
2560 /* Skip P-frames if we do not have a reference frame or
2561 * we have an invalid header. */
2562 if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2563 skip_frame = 1;
2564 break;
2565 }
2566 }
2567 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2568 s2->pict_type == AV_PICTURE_TYPE_B) ||
2569 (avctx->skip_frame >= AVDISCARD_NONKEY &&
2570 s2->pict_type != AV_PICTURE_TYPE_I) ||
2571 avctx->skip_frame >= AVDISCARD_ALL) {
2572 skip_frame = 1;
2573 break;
2574 }
2575
2576 if (!s->mpeg_enc_ctx_allocated)
2577 break;
2578
2579 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2580 if (mb_y < avctx->skip_top ||
2581 mb_y >= s2->mb_height - avctx->skip_bottom)
2582 break;
2583 }
2584
2585 if (!s2->pict_type) {
2586 av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2587 if (avctx->err_recognition & AV_EF_EXPLODE)
2588 return AVERROR_INVALIDDATA;
2589 break;
2590 }
2591
2592 if (s->first_slice) {
2593 skip_frame = 0;
2594 s->first_slice = 0;
2595 if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2596 return ret;
2597 }
2598 if (!s2->current_picture_ptr) {
2599 av_log(avctx, AV_LOG_ERROR,
2600 "current_picture not initialized\n");
2601 return AVERROR_INVALIDDATA;
2602 }
2603
2604 if (HAVE_THREADS &&
2605 (avctx->active_thread_type & FF_THREAD_SLICE) &&
2606 !avctx->hwaccel) {
2607 int threshold = (s2->mb_height * s->slice_count +
2608 s2->slice_context_count / 2) /
2609 s2->slice_context_count;
2610 if (threshold <= mb_y) {
2611 MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2612
2613 thread_context->start_mb_y = mb_y;
2614 thread_context->end_mb_y = s2->mb_height;
2615 if (s->slice_count) {
2616 s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2617 ret = ff_update_duplicate_context(thread_context, s2);
2618 if (ret < 0)
2619 return ret;
2620 }
2621 init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2622 s->slice_count++;
2623 }
2624 buf_ptr += 2; // FIXME add minimum number of bytes per slice
2625 } else {
2626 ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2627 emms_c();
2628
2629 if (ret < 0) {
2630 if (avctx->err_recognition & AV_EF_EXPLODE)
2631 return ret;
2632 if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2633 ff_er_add_slice(&s2->er, s2->resync_mb_x,
2634 s2->resync_mb_y, s2->mb_x, s2->mb_y,
2635 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2636 } else {
2637 ff_er_add_slice(&s2->er, s2->resync_mb_x,
2638 s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2639 ER_AC_END | ER_DC_END | ER_MV_END);
2640 }
2641 }
2642 }
2643 break;
2644 }
2645 }
2646 }
2647
2648 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2649 int *got_output, AVPacket *avpkt)
2650 {
2651 const uint8_t *buf = avpkt->data;
2652 int buf_size = avpkt->size;
2653 Mpeg1Context *s = avctx->priv_data;
2654 AVFrame *picture = data;
2655 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2656 ff_dlog(avctx, "fill_buffer\n");
2657
2658 if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2659 /* special case for last picture */
2660 if (s2->low_delay == 0 && s2->next_picture_ptr) {
2661 int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2662 if (ret < 0)
2663 return ret;
2664
2665 s2->next_picture_ptr = NULL;
2666
2667 *got_output = 1;
2668 }
2669 return buf_size;
2670 }
2671
2672 if (s2->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
2673 int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2674 buf_size, NULL);
2675
2676 if (ff_combine_frame(&s2->parse_context, next,
2677 (const uint8_t **) &buf, &buf_size) < 0)
2678 return buf_size;
2679 }
2680
2681 if (s->mpeg_enc_ctx_allocated == 0 && avctx->codec_tag == AV_RL32("VCR2"))
2682 vcr2_init_sequence(avctx);
2683
2684 s->slice_count = 0;
2685
2686 if (avctx->extradata && !s->extradata_decoded) {
2687 int ret = decode_chunks(avctx, picture, got_output,
2688 avctx->extradata, avctx->extradata_size);
2689 s->extradata_decoded = 1;
2690 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
2691 return ret;
2692 }
2693
2694 return decode_chunks(avctx, picture, got_output, buf, buf_size);
2695 }
2696
2697 static void flush(AVCodecContext *avctx)
2698 {
2699 Mpeg1Context *s = avctx->priv_data;
2700
2701 s->sync = 0;
2702 s->closed_gop = 0;
2703
2704 ff_mpeg_flush(avctx);
2705 }
2706
2707 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2708 {
2709 Mpeg1Context *s = avctx->priv_data;
2710
2711 if (s->mpeg_enc_ctx_allocated)
2712 ff_mpv_common_end(&s->mpeg_enc_ctx);
2713 av_freep(&s->a53_caption);
2714 return 0;
2715 }
2716
2717 AVCodec ff_mpeg1video_decoder = {
2718 .name = "mpeg1video",
2719 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2720 .type = AVMEDIA_TYPE_VIDEO,
2721 .id = AV_CODEC_ID_MPEG1VIDEO,
2722 .priv_data_size = sizeof(Mpeg1Context),
2723 .init = mpeg_decode_init,
2724 .close = mpeg_decode_end,
2725 .decode = mpeg_decode_frame,
2726 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2727 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2728 AV_CODEC_CAP_SLICE_THREADS,
2729 .flush = flush,
2730 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2731 };
2732
2733 AVCodec ff_mpeg2video_decoder = {
2734 .name = "mpeg2video",
2735 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2736 .type = AVMEDIA_TYPE_VIDEO,
2737 .id = AV_CODEC_ID_MPEG2VIDEO,
2738 .priv_data_size = sizeof(Mpeg1Context),
2739 .init = mpeg_decode_init,
2740 .close = mpeg_decode_end,
2741 .decode = mpeg_decode_frame,
2742 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2743 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2744 AV_CODEC_CAP_SLICE_THREADS,
2745 .flush = flush,
2746 .profiles = NULL_IF_CONFIG_SMALL(ff_mpeg2_video_profiles),
2747 };
2748
2749 #if FF_API_XVMC
2750 #if CONFIG_MPEG_XVMC_DECODER
2751 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2752 {
2753 if (avctx->active_thread_type & FF_THREAD_SLICE)
2754 return -1;
2755 if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2756 return -1;
2757 if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2758 ff_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2759 }
2760 mpeg_decode_init(avctx);
2761
2762 avctx->pix_fmt = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2763 avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2764
2765 return 0;
2766 }
2767
2768 AVCodec ff_mpeg_xvmc_decoder = {
2769 .name = "mpegvideo_xvmc",
2770 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2771 .type = AVMEDIA_TYPE_VIDEO,
2772 .id = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2773 .priv_data_size = sizeof(Mpeg1Context),
2774 .init = mpeg_mc_decode_init,
2775 .close = mpeg_decode_end,
2776 .decode = mpeg_decode_frame,
2777 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2778 AV_CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL |
2779 AV_CODEC_CAP_DELAY,
2780 .flush = flush,
2781 };
2782
2783 #endif
2784 #endif /* FF_API_XVMC */