mpegvideo: Move tables to a separate file
[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 "thread.h"
46 #include "version.h"
47 #include "xvmc_internal.h"
48
49 typedef struct Mpeg1Context {
50 MpegEncContext mpeg_enc_ctx;
51 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
52 int repeat_field; /* true if we must repeat the field */
53 AVPanScan pan_scan; /* some temporary storage for the panscan */
54 AVStereo3D stereo3d;
55 int has_stereo3d;
56 uint8_t *a53_caption;
57 int a53_caption_size;
58 uint8_t afd;
59 int has_afd;
60 int slice_count;
61 int save_aspect_info;
62 int save_width, save_height, save_progressive_seq;
63 AVRational frame_rate_ext; /* MPEG-2 specific framerate modificator */
64 int sync; /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
65 int closed_gop; /* GOP is closed */
66 int first_slice;
67 int extradata_decoded;
68 } Mpeg1Context;
69
70 #define MB_TYPE_ZERO_MV 0x20000000
71
72 static const uint32_t ptype2mb_type[7] = {
73 MB_TYPE_INTRA,
74 MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
75 MB_TYPE_L0,
76 MB_TYPE_L0 | MB_TYPE_CBP,
77 MB_TYPE_QUANT | MB_TYPE_INTRA,
78 MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
79 MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
80 };
81
82 static const uint32_t btype2mb_type[11] = {
83 MB_TYPE_INTRA,
84 MB_TYPE_L1,
85 MB_TYPE_L1 | MB_TYPE_CBP,
86 MB_TYPE_L0,
87 MB_TYPE_L0 | MB_TYPE_CBP,
88 MB_TYPE_L0L1,
89 MB_TYPE_L0L1 | MB_TYPE_CBP,
90 MB_TYPE_QUANT | MB_TYPE_INTRA,
91 MB_TYPE_QUANT | MB_TYPE_L1 | MB_TYPE_CBP,
92 MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
93 MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
94 };
95
96 static const uint8_t non_linear_qscale[32] = {
97 0, 1, 2, 3, 4, 5, 6, 7,
98 8, 10, 12, 14, 16, 18, 20, 22,
99 24, 28, 32, 36, 40, 44, 48, 52,
100 56, 64, 72, 80, 88, 96, 104, 112,
101 };
102
103 /* as H.263, but only 17 codes */
104 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
105 {
106 int code, sign, val, shift;
107
108 code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
109 if (code == 0)
110 return pred;
111 if (code < 0)
112 return 0xffff;
113
114 sign = get_bits1(&s->gb);
115 shift = fcode - 1;
116 val = code;
117 if (shift) {
118 val = (val - 1) << shift;
119 val |= get_bits(&s->gb, shift);
120 val++;
121 }
122 if (sign)
123 val = -val;
124 val += pred;
125
126 /* modulo decoding */
127 return sign_extend(val, 5 + shift);
128 }
129
130 #define check_scantable_index(ctx, x) \
131 do { \
132 if ((x) > 63) { \
133 av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", \
134 ctx->mb_x, ctx->mb_y); \
135 return AVERROR_INVALIDDATA; \
136 } \
137 } while (0)
138
139 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
140 int16_t *block, int n)
141 {
142 int level, dc, diff, i, j, run;
143 int component;
144 RLTable *rl = &ff_rl_mpeg1;
145 uint8_t *const scantable = s->intra_scantable.permutated;
146 const uint16_t *quant_matrix = s->intra_matrix;
147 const int qscale = s->qscale;
148
149 /* DC coefficient */
150 component = (n <= 3 ? 0 : n - 4 + 1);
151 diff = decode_dc(&s->gb, component);
152 if (diff >= 0xffff)
153 return AVERROR_INVALIDDATA;
154 dc = s->last_dc[component];
155 dc += diff;
156 s->last_dc[component] = dc;
157 block[0] = dc * quant_matrix[0];
158 ff_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
159 i = 0;
160 {
161 OPEN_READER(re, &s->gb);
162 /* now quantify & encode AC coefficients */
163 for (;;) {
164 UPDATE_CACHE(re, &s->gb);
165 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
166 TEX_VLC_BITS, 2, 0);
167
168 if (level == 127) {
169 break;
170 } else if (level != 0) {
171 i += run;
172 check_scantable_index(s, i);
173 j = scantable[i];
174 level = (level * qscale * quant_matrix[j]) >> 4;
175 level = (level - 1) | 1;
176 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
177 SHOW_SBITS(re, &s->gb, 1);
178 LAST_SKIP_BITS(re, &s->gb, 1);
179 } else {
180 /* escape */
181 run = SHOW_UBITS(re, &s->gb, 6) + 1;
182 LAST_SKIP_BITS(re, &s->gb, 6);
183 UPDATE_CACHE(re, &s->gb);
184 level = SHOW_SBITS(re, &s->gb, 8);
185 SKIP_BITS(re, &s->gb, 8);
186 if (level == -128) {
187 level = SHOW_UBITS(re, &s->gb, 8) - 256;
188 LAST_SKIP_BITS(re, &s->gb, 8);
189 } else if (level == 0) {
190 level = SHOW_UBITS(re, &s->gb, 8);
191 LAST_SKIP_BITS(re, &s->gb, 8);
192 }
193 i += run;
194 check_scantable_index(s, i);
195 j = scantable[i];
196 if (level < 0) {
197 level = -level;
198 level = (level * qscale * quant_matrix[j]) >> 4;
199 level = (level - 1) | 1;
200 level = -level;
201 } else {
202 level = (level * qscale * quant_matrix[j]) >> 4;
203 level = (level - 1) | 1;
204 }
205 }
206
207 block[j] = level;
208 }
209 CLOSE_READER(re, &s->gb);
210 }
211 s->block_last_index[n] = i;
212 return 0;
213 }
214
215 int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
216 {
217 return mpeg1_decode_block_intra(s, block, n);
218 }
219
220 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
221 int16_t *block, int n)
222 {
223 int level, i, j, run;
224 RLTable *rl = &ff_rl_mpeg1;
225 uint8_t *const scantable = s->intra_scantable.permutated;
226 const uint16_t *quant_matrix = s->inter_matrix;
227 const int qscale = s->qscale;
228
229 {
230 OPEN_READER(re, &s->gb);
231 i = -1;
232 // special case for first coefficient, no need to add second VLC table
233 UPDATE_CACHE(re, &s->gb);
234 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
235 level = (3 * qscale * quant_matrix[0]) >> 5;
236 level = (level - 1) | 1;
237 if (GET_CACHE(re, &s->gb) & 0x40000000)
238 level = -level;
239 block[0] = level;
240 i++;
241 SKIP_BITS(re, &s->gb, 2);
242 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
243 goto end;
244 }
245 /* now quantify & encode AC coefficients */
246 for (;;) {
247 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
248 TEX_VLC_BITS, 2, 0);
249
250 if (level != 0) {
251 i += run;
252 check_scantable_index(s, i);
253 j = scantable[i];
254 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
255 level = (level - 1) | 1;
256 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
257 SHOW_SBITS(re, &s->gb, 1);
258 SKIP_BITS(re, &s->gb, 1);
259 } else {
260 /* escape */
261 run = SHOW_UBITS(re, &s->gb, 6) + 1;
262 LAST_SKIP_BITS(re, &s->gb, 6);
263 UPDATE_CACHE(re, &s->gb);
264 level = SHOW_SBITS(re, &s->gb, 8);
265 SKIP_BITS(re, &s->gb, 8);
266 if (level == -128) {
267 level = SHOW_UBITS(re, &s->gb, 8) - 256;
268 SKIP_BITS(re, &s->gb, 8);
269 } else if (level == 0) {
270 level = SHOW_UBITS(re, &s->gb, 8);
271 SKIP_BITS(re, &s->gb, 8);
272 }
273 i += run;
274 check_scantable_index(s, i);
275 j = scantable[i];
276 if (level < 0) {
277 level = -level;
278 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
279 level = (level - 1) | 1;
280 level = -level;
281 } else {
282 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
283 level = (level - 1) | 1;
284 }
285 }
286
287 block[j] = level;
288 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
289 break;
290 UPDATE_CACHE(re, &s->gb);
291 }
292 end:
293 LAST_SKIP_BITS(re, &s->gb, 2);
294 CLOSE_READER(re, &s->gb);
295 }
296 s->block_last_index[n] = i;
297 return 0;
298 }
299
300 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
301 int16_t *block, int n)
302 {
303 int level, i, j, run;
304 RLTable *rl = &ff_rl_mpeg1;
305 uint8_t *const scantable = s->intra_scantable.permutated;
306 const int qscale = s->qscale;
307
308 {
309 OPEN_READER(re, &s->gb);
310 i = -1;
311 // Special case for first coefficient, no need to add second VLC table.
312 UPDATE_CACHE(re, &s->gb);
313 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
314 level = (3 * qscale) >> 1;
315 level = (level - 1) | 1;
316 if (GET_CACHE(re, &s->gb) & 0x40000000)
317 level = -level;
318 block[0] = level;
319 i++;
320 SKIP_BITS(re, &s->gb, 2);
321 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
322 goto end;
323 }
324
325 /* now quantify & encode AC coefficients */
326 for (;;) {
327 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
328 TEX_VLC_BITS, 2, 0);
329
330 if (level != 0) {
331 i += run;
332 check_scantable_index(s, i);
333 j = scantable[i];
334 level = ((level * 2 + 1) * qscale) >> 1;
335 level = (level - 1) | 1;
336 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
337 SHOW_SBITS(re, &s->gb, 1);
338 SKIP_BITS(re, &s->gb, 1);
339 } else {
340 /* escape */
341 run = SHOW_UBITS(re, &s->gb, 6) + 1;
342 LAST_SKIP_BITS(re, &s->gb, 6);
343 UPDATE_CACHE(re, &s->gb);
344 level = SHOW_SBITS(re, &s->gb, 8);
345 SKIP_BITS(re, &s->gb, 8);
346 if (level == -128) {
347 level = SHOW_UBITS(re, &s->gb, 8) - 256;
348 SKIP_BITS(re, &s->gb, 8);
349 } else if (level == 0) {
350 level = SHOW_UBITS(re, &s->gb, 8);
351 SKIP_BITS(re, &s->gb, 8);
352 }
353 i += run;
354 check_scantable_index(s, i);
355 j = scantable[i];
356 if (level < 0) {
357 level = -level;
358 level = ((level * 2 + 1) * qscale) >> 1;
359 level = (level - 1) | 1;
360 level = -level;
361 } else {
362 level = ((level * 2 + 1) * qscale) >> 1;
363 level = (level - 1) | 1;
364 }
365 }
366
367 block[j] = level;
368 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
369 break;
370 UPDATE_CACHE(re, &s->gb);
371 }
372 end:
373 LAST_SKIP_BITS(re, &s->gb, 2);
374 CLOSE_READER(re, &s->gb);
375 }
376 s->block_last_index[n] = i;
377 return 0;
378 }
379
380 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
381 int16_t *block, int n)
382 {
383 int level, i, j, run;
384 RLTable *rl = &ff_rl_mpeg1;
385 uint8_t *const scantable = s->intra_scantable.permutated;
386 const uint16_t *quant_matrix;
387 const int qscale = s->qscale;
388 int mismatch;
389
390 mismatch = 1;
391
392 {
393 OPEN_READER(re, &s->gb);
394 i = -1;
395 if (n < 4)
396 quant_matrix = s->inter_matrix;
397 else
398 quant_matrix = s->chroma_inter_matrix;
399
400 // Special case for first coefficient, no need to add second VLC table.
401 UPDATE_CACHE(re, &s->gb);
402 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
403 level = (3 * qscale * quant_matrix[0]) >> 5;
404 if (GET_CACHE(re, &s->gb) & 0x40000000)
405 level = -level;
406 block[0] = level;
407 mismatch ^= level;
408 i++;
409 SKIP_BITS(re, &s->gb, 2);
410 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
411 goto end;
412 }
413
414 /* now quantify & encode AC coefficients */
415 for (;;) {
416 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
417 TEX_VLC_BITS, 2, 0);
418
419 if (level != 0) {
420 i += run;
421 check_scantable_index(s, i);
422 j = scantable[i];
423 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
424 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
425 SHOW_SBITS(re, &s->gb, 1);
426 SKIP_BITS(re, &s->gb, 1);
427 } else {
428 /* escape */
429 run = SHOW_UBITS(re, &s->gb, 6) + 1;
430 LAST_SKIP_BITS(re, &s->gb, 6);
431 UPDATE_CACHE(re, &s->gb);
432 level = SHOW_SBITS(re, &s->gb, 12);
433 SKIP_BITS(re, &s->gb, 12);
434
435 i += run;
436 check_scantable_index(s, i);
437 j = scantable[i];
438 if (level < 0) {
439 level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
440 level = -level;
441 } else {
442 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
443 }
444 }
445
446 mismatch ^= level;
447 block[j] = level;
448 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
449 break;
450 UPDATE_CACHE(re, &s->gb);
451 }
452 end:
453 LAST_SKIP_BITS(re, &s->gb, 2);
454 CLOSE_READER(re, &s->gb);
455 }
456 block[63] ^= (mismatch & 1);
457
458 s->block_last_index[n] = i;
459 return 0;
460 }
461
462 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
463 int16_t *block, int n)
464 {
465 int level, i, j, run;
466 RLTable *rl = &ff_rl_mpeg1;
467 uint8_t *const scantable = s->intra_scantable.permutated;
468 const int qscale = s->qscale;
469 OPEN_READER(re, &s->gb);
470 i = -1;
471
472 // special case for first coefficient, no need to add second VLC table
473 UPDATE_CACHE(re, &s->gb);
474 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
475 level = (3 * qscale) >> 1;
476 if (GET_CACHE(re, &s->gb) & 0x40000000)
477 level = -level;
478 block[0] = level;
479 i++;
480 SKIP_BITS(re, &s->gb, 2);
481 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
482 goto end;
483 }
484
485 /* now quantify & encode AC coefficients */
486 for (;;) {
487 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
488
489 if (level != 0) {
490 i += run;
491 check_scantable_index(s, i);
492 j = scantable[i];
493 level = ((level * 2 + 1) * qscale) >> 1;
494 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
495 SHOW_SBITS(re, &s->gb, 1);
496 SKIP_BITS(re, &s->gb, 1);
497 } else {
498 /* escape */
499 run = SHOW_UBITS(re, &s->gb, 6) + 1;
500 LAST_SKIP_BITS(re, &s->gb, 6);
501 UPDATE_CACHE(re, &s->gb);
502 level = SHOW_SBITS(re, &s->gb, 12);
503 SKIP_BITS(re, &s->gb, 12);
504
505 i += run;
506 check_scantable_index(s, i);
507 j = scantable[i];
508 if (level < 0) {
509 level = ((-level * 2 + 1) * qscale) >> 1;
510 level = -level;
511 } else {
512 level = ((level * 2 + 1) * qscale) >> 1;
513 }
514 }
515
516 block[j] = level;
517 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
518 break;
519 UPDATE_CACHE(re, &s->gb);
520 }
521 end:
522 LAST_SKIP_BITS(re, &s->gb, 2);
523 CLOSE_READER(re, &s->gb);
524 s->block_last_index[n] = i;
525 return 0;
526 }
527
528 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
529 int16_t *block, int n)
530 {
531 int level, dc, diff, i, j, run;
532 int component;
533 RLTable *rl;
534 uint8_t *const scantable = s->intra_scantable.permutated;
535 const uint16_t *quant_matrix;
536 const int qscale = s->qscale;
537 int mismatch;
538
539 /* DC coefficient */
540 if (n < 4) {
541 quant_matrix = s->intra_matrix;
542 component = 0;
543 } else {
544 quant_matrix = s->chroma_intra_matrix;
545 component = (n & 1) + 1;
546 }
547 diff = decode_dc(&s->gb, component);
548 if (diff >= 0xffff)
549 return AVERROR_INVALIDDATA;
550 dc = s->last_dc[component];
551 dc += diff;
552 s->last_dc[component] = dc;
553 block[0] = dc << (3 - s->intra_dc_precision);
554 ff_dlog(s->avctx, "dc=%d\n", block[0]);
555 mismatch = block[0] ^ 1;
556 i = 0;
557 if (s->intra_vlc_format)
558 rl = &ff_rl_mpeg2;
559 else
560 rl = &ff_rl_mpeg1;
561
562 {
563 OPEN_READER(re, &s->gb);
564 /* now quantify & encode AC coefficients */
565 for (;;) {
566 UPDATE_CACHE(re, &s->gb);
567 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
568 TEX_VLC_BITS, 2, 0);
569
570 if (level == 127) {
571 break;
572 } else if (level != 0) {
573 i += run;
574 check_scantable_index(s, i);
575 j = scantable[i];
576 level = (level * qscale * quant_matrix[j]) >> 4;
577 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
578 SHOW_SBITS(re, &s->gb, 1);
579 LAST_SKIP_BITS(re, &s->gb, 1);
580 } else {
581 /* escape */
582 run = SHOW_UBITS(re, &s->gb, 6) + 1;
583 LAST_SKIP_BITS(re, &s->gb, 6);
584 UPDATE_CACHE(re, &s->gb);
585 level = SHOW_SBITS(re, &s->gb, 12);
586 SKIP_BITS(re, &s->gb, 12);
587 i += run;
588 check_scantable_index(s, i);
589 j = scantable[i];
590 if (level < 0) {
591 level = (-level * qscale * quant_matrix[j]) >> 4;
592 level = -level;
593 } else {
594 level = (level * qscale * quant_matrix[j]) >> 4;
595 }
596 }
597
598 mismatch ^= level;
599 block[j] = level;
600 }
601 CLOSE_READER(re, &s->gb);
602 }
603 block[63] ^= mismatch & 1;
604
605 s->block_last_index[n] = i;
606 return 0;
607 }
608
609 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
610 int16_t *block, int n)
611 {
612 int level, dc, diff, i, j, run;
613 int component;
614 RLTable *rl;
615 uint8_t *const scantable = s->intra_scantable.permutated;
616 const uint16_t *quant_matrix;
617 const int qscale = s->qscale;
618
619 /* DC coefficient */
620 if (n < 4) {
621 quant_matrix = s->intra_matrix;
622 component = 0;
623 } else {
624 quant_matrix = s->chroma_intra_matrix;
625 component = (n & 1) + 1;
626 }
627 diff = decode_dc(&s->gb, component);
628 if (diff >= 0xffff)
629 return AVERROR_INVALIDDATA;
630 dc = s->last_dc[component];
631 dc += diff;
632 s->last_dc[component] = dc;
633 block[0] = dc << (3 - s->intra_dc_precision);
634 i = 0;
635 if (s->intra_vlc_format)
636 rl = &ff_rl_mpeg2;
637 else
638 rl = &ff_rl_mpeg1;
639
640 {
641 OPEN_READER(re, &s->gb);
642 /* now quantify & encode AC coefficients */
643 for (;;) {
644 UPDATE_CACHE(re, &s->gb);
645 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
646 TEX_VLC_BITS, 2, 0);
647
648 if (level == 127) {
649 break;
650 } else if (level != 0) {
651 i += run;
652 check_scantable_index(s, i);
653 j = scantable[i];
654 level = (level * qscale * quant_matrix[j]) >> 4;
655 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
656 SHOW_SBITS(re, &s->gb, 1);
657 LAST_SKIP_BITS(re, &s->gb, 1);
658 } else {
659 /* escape */
660 run = SHOW_UBITS(re, &s->gb, 6) + 1;
661 LAST_SKIP_BITS(re, &s->gb, 6);
662 UPDATE_CACHE(re, &s->gb);
663 level = SHOW_SBITS(re, &s->gb, 12);
664 SKIP_BITS(re, &s->gb, 12);
665 i += run;
666 check_scantable_index(s, i);
667 j = scantable[i];
668 if (level < 0) {
669 level = (-level * qscale * quant_matrix[j]) >> 4;
670 level = -level;
671 } else {
672 level = (level * qscale * quant_matrix[j]) >> 4;
673 }
674 }
675
676 block[j] = level;
677 }
678 CLOSE_READER(re, &s->gb);
679 }
680
681 s->block_last_index[n] = i;
682 return 0;
683 }
684
685 /******************************************/
686 /* decoding */
687
688 static inline int get_dmv(MpegEncContext *s)
689 {
690 if (get_bits1(&s->gb))
691 return 1 - (get_bits1(&s->gb) << 1);
692 else
693 return 0;
694 }
695
696 static inline int get_qscale(MpegEncContext *s)
697 {
698 int qscale = get_bits(&s->gb, 5);
699 if (s->q_scale_type)
700 return non_linear_qscale[qscale];
701 else
702 return qscale << 1;
703 }
704
705 /* motion type (for MPEG-2) */
706 #define MT_FIELD 1
707 #define MT_FRAME 2
708 #define MT_16X8 2
709 #define MT_DMV 3
710
711 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
712 {
713 int i, j, k, cbp, val, mb_type, motion_type;
714 const int mb_block_count = 4 + (1 << s->chroma_format);
715 int ret;
716
717 ff_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
718
719 assert(s->mb_skipped == 0);
720
721 if (s->mb_skip_run-- != 0) {
722 if (s->pict_type == AV_PICTURE_TYPE_P) {
723 s->mb_skipped = 1;
724 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
725 MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
726 } else {
727 int mb_type;
728
729 if (s->mb_x)
730 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
731 else
732 // FIXME not sure if this is allowed in MPEG at all
733 mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
734 if (IS_INTRA(mb_type))
735 return AVERROR_INVALIDDATA;
736 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
737 mb_type | MB_TYPE_SKIP;
738 // assert(s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1] & (MB_TYPE_16x16 | MB_TYPE_16x8));
739
740 if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
741 s->mb_skipped = 1;
742 }
743
744 return 0;
745 }
746
747 switch (s->pict_type) {
748 default:
749 case AV_PICTURE_TYPE_I:
750 if (get_bits1(&s->gb) == 0) {
751 if (get_bits1(&s->gb) == 0) {
752 av_log(s->avctx, AV_LOG_ERROR,
753 "invalid mb type in I Frame at %d %d\n",
754 s->mb_x, s->mb_y);
755 return AVERROR_INVALIDDATA;
756 }
757 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
758 } else {
759 mb_type = MB_TYPE_INTRA;
760 }
761 break;
762 case AV_PICTURE_TYPE_P:
763 mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
764 if (mb_type < 0) {
765 av_log(s->avctx, AV_LOG_ERROR,
766 "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
767 return AVERROR_INVALIDDATA;
768 }
769 mb_type = ptype2mb_type[mb_type];
770 break;
771 case AV_PICTURE_TYPE_B:
772 mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
773 if (mb_type < 0) {
774 av_log(s->avctx, AV_LOG_ERROR,
775 "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
776 return AVERROR_INVALIDDATA;
777 }
778 mb_type = btype2mb_type[mb_type];
779 break;
780 }
781 ff_dlog(s->avctx, "mb_type=%x\n", mb_type);
782 // motion_type = 0; /* avoid warning */
783 if (IS_INTRA(mb_type)) {
784 s->bdsp.clear_blocks(s->block[0]);
785
786 if (!s->chroma_y_shift)
787 s->bdsp.clear_blocks(s->block[6]);
788
789 /* compute DCT type */
790 // FIXME: add an interlaced_dct coded var?
791 if (s->picture_structure == PICT_FRAME &&
792 !s->frame_pred_frame_dct)
793 s->interlaced_dct = get_bits1(&s->gb);
794
795 if (IS_QUANT(mb_type))
796 s->qscale = get_qscale(s);
797
798 if (s->concealment_motion_vectors) {
799 /* just parse them */
800 if (s->picture_structure != PICT_FRAME)
801 skip_bits1(&s->gb); /* field select */
802
803 s->mv[0][0][0] =
804 s->last_mv[0][0][0] =
805 s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
806 s->last_mv[0][0][0]);
807 s->mv[0][0][1] =
808 s->last_mv[0][0][1] =
809 s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
810 s->last_mv[0][0][1]);
811
812 skip_bits1(&s->gb); /* marker */
813 } else {
814 /* reset mv prediction */
815 memset(s->last_mv, 0, sizeof(s->last_mv));
816 }
817 s->mb_intra = 1;
818 #if FF_API_XVMC
819 FF_DISABLE_DEPRECATION_WARNINGS
820 // if 1, we memcpy blocks in xvmcvideo
821 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
822 ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
823 FF_ENABLE_DEPRECATION_WARNINGS
824 #endif /* FF_API_XVMC */
825
826 if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
827 if (s->avctx->flags2 & CODEC_FLAG2_FAST) {
828 for (i = 0; i < 6; i++)
829 mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
830 } else {
831 for (i = 0; i < mb_block_count; i++)
832 if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
833 return ret;
834 }
835 } else {
836 for (i = 0; i < 6; i++)
837 if ((ret = mpeg1_decode_block_intra(s, *s->pblocks[i], i)) < 0)
838 return ret;
839 }
840 } else {
841 if (mb_type & MB_TYPE_ZERO_MV) {
842 assert(mb_type & MB_TYPE_CBP);
843
844 s->mv_dir = MV_DIR_FORWARD;
845 if (s->picture_structure == PICT_FRAME) {
846 if (!s->frame_pred_frame_dct)
847 s->interlaced_dct = get_bits1(&s->gb);
848 s->mv_type = MV_TYPE_16X16;
849 } else {
850 s->mv_type = MV_TYPE_FIELD;
851 mb_type |= MB_TYPE_INTERLACED;
852 s->field_select[0][0] = s->picture_structure - 1;
853 }
854
855 if (IS_QUANT(mb_type))
856 s->qscale = get_qscale(s);
857
858 s->last_mv[0][0][0] = 0;
859 s->last_mv[0][0][1] = 0;
860 s->last_mv[0][1][0] = 0;
861 s->last_mv[0][1][1] = 0;
862 s->mv[0][0][0] = 0;
863 s->mv[0][0][1] = 0;
864 } else {
865 assert(mb_type & MB_TYPE_L0L1);
866 // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
867 /* get additional motion vector type */
868 if (s->frame_pred_frame_dct) {
869 motion_type = MT_FRAME;
870 } else {
871 motion_type = get_bits(&s->gb, 2);
872 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
873 s->interlaced_dct = get_bits1(&s->gb);
874 }
875
876 if (IS_QUANT(mb_type))
877 s->qscale = get_qscale(s);
878
879 /* motion vectors */
880 s->mv_dir = (mb_type >> 13) & 3;
881 ff_dlog(s->avctx, "motion_type=%d\n", motion_type);
882 switch (motion_type) {
883 case MT_FRAME: /* or MT_16X8 */
884 if (s->picture_structure == PICT_FRAME) {
885 mb_type |= MB_TYPE_16x16;
886 s->mv_type = MV_TYPE_16X16;
887 for (i = 0; i < 2; i++) {
888 if (USES_LIST(mb_type, i)) {
889 /* MT_FRAME */
890 s->mv[i][0][0] =
891 s->last_mv[i][0][0] =
892 s->last_mv[i][1][0] =
893 mpeg_decode_motion(s, s->mpeg_f_code[i][0],
894 s->last_mv[i][0][0]);
895 s->mv[i][0][1] =
896 s->last_mv[i][0][1] =
897 s->last_mv[i][1][1] =
898 mpeg_decode_motion(s, s->mpeg_f_code[i][1],
899 s->last_mv[i][0][1]);
900 /* full_pel: only for MPEG-1 */
901 if (s->full_pel[i]) {
902 s->mv[i][0][0] <<= 1;
903 s->mv[i][0][1] <<= 1;
904 }
905 }
906 }
907 } else {
908 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
909 s->mv_type = MV_TYPE_16X8;
910 for (i = 0; i < 2; i++) {
911 if (USES_LIST(mb_type, i)) {
912 /* MT_16X8 */
913 for (j = 0; j < 2; j++) {
914 s->field_select[i][j] = get_bits1(&s->gb);
915 for (k = 0; k < 2; k++) {
916 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
917 s->last_mv[i][j][k]);
918 s->last_mv[i][j][k] = val;
919 s->mv[i][j][k] = val;
920 }
921 }
922 }
923 }
924 }
925 break;
926 case MT_FIELD:
927 s->mv_type = MV_TYPE_FIELD;
928 if (s->picture_structure == PICT_FRAME) {
929 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
930 for (i = 0; i < 2; i++) {
931 if (USES_LIST(mb_type, i)) {
932 for (j = 0; j < 2; j++) {
933 s->field_select[i][j] = get_bits1(&s->gb);
934 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
935 s->last_mv[i][j][0]);
936 s->last_mv[i][j][0] = val;
937 s->mv[i][j][0] = val;
938 ff_dlog(s->avctx, "fmx=%d\n", val);
939 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
940 s->last_mv[i][j][1] >> 1);
941 s->last_mv[i][j][1] = val << 1;
942 s->mv[i][j][1] = val;
943 ff_dlog(s->avctx, "fmy=%d\n", val);
944 }
945 }
946 }
947 } else {
948 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
949 for (i = 0; i < 2; i++) {
950 if (USES_LIST(mb_type, i)) {
951 s->field_select[i][0] = get_bits1(&s->gb);
952 for (k = 0; k < 2; k++) {
953 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
954 s->last_mv[i][0][k]);
955 s->last_mv[i][0][k] = val;
956 s->last_mv[i][1][k] = val;
957 s->mv[i][0][k] = val;
958 }
959 }
960 }
961 }
962 break;
963 case MT_DMV:
964 s->mv_type = MV_TYPE_DMV;
965 for (i = 0; i < 2; i++) {
966 if (USES_LIST(mb_type, i)) {
967 int dmx, dmy, mx, my, m;
968 const int my_shift = s->picture_structure == PICT_FRAME;
969
970 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
971 s->last_mv[i][0][0]);
972 s->last_mv[i][0][0] = mx;
973 s->last_mv[i][1][0] = mx;
974 dmx = get_dmv(s);
975 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
976 s->last_mv[i][0][1] >> my_shift);
977 dmy = get_dmv(s);
978
979
980 s->last_mv[i][0][1] = my << my_shift;
981 s->last_mv[i][1][1] = my << my_shift;
982
983 s->mv[i][0][0] = mx;
984 s->mv[i][0][1] = my;
985 s->mv[i][1][0] = mx; // not used
986 s->mv[i][1][1] = my; // not used
987
988 if (s->picture_structure == PICT_FRAME) {
989 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
990
991 // m = 1 + 2 * s->top_field_first;
992 m = s->top_field_first ? 1 : 3;
993
994 /* top -> top pred */
995 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
996 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
997 m = 4 - m;
998 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
999 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1000 } else {
1001 mb_type |= MB_TYPE_16x16;
1002
1003 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1004 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1005 if (s->picture_structure == PICT_TOP_FIELD)
1006 s->mv[i][2][1]--;
1007 else
1008 s->mv[i][2][1]++;
1009 }
1010 }
1011 }
1012 break;
1013 default:
1014 av_log(s->avctx, AV_LOG_ERROR,
1015 "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1016 return AVERROR_INVALIDDATA;
1017 }
1018 }
1019
1020 s->mb_intra = 0;
1021 if (HAS_CBP(mb_type)) {
1022 s->bdsp.clear_blocks(s->block[0]);
1023
1024 cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1025 if (mb_block_count > 6) {
1026 cbp <<= mb_block_count - 6;
1027 cbp |= get_bits(&s->gb, mb_block_count - 6);
1028 s->bdsp.clear_blocks(s->block[6]);
1029 }
1030 if (cbp <= 0) {
1031 av_log(s->avctx, AV_LOG_ERROR,
1032 "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1033 return AVERROR_INVALIDDATA;
1034 }
1035
1036 #if FF_API_XVMC
1037 FF_DISABLE_DEPRECATION_WARNINGS
1038 // if 1, we memcpy blocks in xvmcvideo
1039 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1040 ff_xvmc_pack_pblocks(s, cbp);
1041 FF_ENABLE_DEPRECATION_WARNINGS
1042 #endif /* FF_API_XVMC */
1043
1044 if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1045 if (s->avctx->flags2 & CODEC_FLAG2_FAST) {
1046 for (i = 0; i < 6; i++) {
1047 if (cbp & 32)
1048 mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1049 else
1050 s->block_last_index[i] = -1;
1051 cbp += cbp;
1052 }
1053 } else {
1054 cbp <<= 12 - mb_block_count;
1055
1056 for (i = 0; i < mb_block_count; i++) {
1057 if (cbp & (1 << 11)) {
1058 if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1059 return ret;
1060 } else {
1061 s->block_last_index[i] = -1;
1062 }
1063 cbp += cbp;
1064 }
1065 }
1066 } else {
1067 if (s->avctx->flags2 & CODEC_FLAG2_FAST) {
1068 for (i = 0; i < 6; i++) {
1069 if (cbp & 32)
1070 mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1071 else
1072 s->block_last_index[i] = -1;
1073 cbp += cbp;
1074 }
1075 } else {
1076 for (i = 0; i < 6; i++) {
1077 if (cbp & 32) {
1078 if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1079 return ret;
1080 } else {
1081 s->block_last_index[i] = -1;
1082 }
1083 cbp += cbp;
1084 }
1085 }
1086 }
1087 } else {
1088 for (i = 0; i < 12; i++)
1089 s->block_last_index[i] = -1;
1090 }
1091 }
1092
1093 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1094
1095 return 0;
1096 }
1097
1098 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1099 {
1100 Mpeg1Context *s = avctx->priv_data;
1101 MpegEncContext *s2 = &s->mpeg_enc_ctx;
1102
1103 ff_mpv_decode_defaults(s2);
1104
1105 s->mpeg_enc_ctx.avctx = avctx;
1106
1107 /* we need some permutation to store matrices,
1108 * until the decoder sets the real permutation. */
1109 ff_mpv_idct_init(s2);
1110 ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1111 ff_mpeg12_init_vlcs();
1112
1113 s->mpeg_enc_ctx_allocated = 0;
1114 s->mpeg_enc_ctx.picture_number = 0;
1115 s->repeat_field = 0;
1116 s->mpeg_enc_ctx.codec_id = avctx->codec->id;
1117 avctx->color_range = AVCOL_RANGE_MPEG;
1118 if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1119 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1120 else
1121 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1122 return 0;
1123 }
1124
1125 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1126 const AVCodecContext *avctx_from)
1127 {
1128 Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1129 MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1130 int err;
1131
1132 if (avctx == avctx_from ||
1133 !ctx_from->mpeg_enc_ctx_allocated ||
1134 !s1->context_initialized)
1135 return 0;
1136
1137 err = ff_mpeg_update_thread_context(avctx, avctx_from);
1138 if (err)
1139 return err;
1140
1141 if (!ctx->mpeg_enc_ctx_allocated) {
1142 // copy the whole context after the initial MpegEncContext structure
1143 memcpy(ctx, ctx_from, sizeof(*ctx));
1144 memset(&ctx->mpeg_enc_ctx, 0, sizeof(ctx->mpeg_enc_ctx));
1145 }
1146
1147 if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1148 s->picture_number++;
1149
1150 return 0;
1151 }
1152
1153 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1154 const uint8_t *new_perm)
1155 {
1156 uint16_t temp_matrix[64];
1157 int i;
1158
1159 memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1160
1161 for (i = 0; i < 64; i++)
1162 matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1163 }
1164
1165 #if FF_API_XVMC
1166 static const enum AVPixelFormat pixfmt_xvmc_mpg2_420[] = {
1167 AV_PIX_FMT_XVMC_MPEG2_IDCT,
1168 AV_PIX_FMT_XVMC_MPEG2_MC,
1169 AV_PIX_FMT_NONE
1170 };
1171 #endif /* FF_API_XVMC */
1172
1173 static const enum AVPixelFormat mpeg12_hwaccel_pixfmt_list_420[] = {
1174 #if CONFIG_MPEG2_DXVA2_HWACCEL
1175 AV_PIX_FMT_DXVA2_VLD,
1176 #endif
1177 #if CONFIG_MPEG2_D3D11VA_HWACCEL
1178 AV_PIX_FMT_D3D11VA_VLD,
1179 #endif
1180 #if CONFIG_MPEG2_VAAPI_HWACCEL
1181 AV_PIX_FMT_VAAPI_VLD,
1182 #endif
1183 #if CONFIG_MPEG1_VDPAU_HWACCEL | CONFIG_MPEG2_VDPAU_HWACCEL
1184 AV_PIX_FMT_VDPAU,
1185 #endif
1186 AV_PIX_FMT_YUV420P,
1187 AV_PIX_FMT_NONE
1188 };
1189
1190 static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1191 AV_PIX_FMT_YUV422P,
1192 AV_PIX_FMT_NONE
1193 };
1194
1195 static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1196 AV_PIX_FMT_YUV444P,
1197 AV_PIX_FMT_NONE
1198 };
1199
1200 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1201 {
1202 Mpeg1Context *s1 = avctx->priv_data;
1203 MpegEncContext *s = &s1->mpeg_enc_ctx;
1204 const enum AVPixelFormat *pix_fmts;
1205
1206 #if FF_API_XVMC
1207 FF_DISABLE_DEPRECATION_WARNINGS
1208 if (avctx->xvmc_acceleration)
1209 return ff_get_format(avctx, pixfmt_xvmc_mpg2_420);
1210 FF_ENABLE_DEPRECATION_WARNINGS
1211 #endif /* FF_API_XVMC */
1212
1213 if (s->chroma_format < 2)
1214 pix_fmts = mpeg12_hwaccel_pixfmt_list_420;
1215 else if (s->chroma_format == 2)
1216 pix_fmts = mpeg12_pixfmt_list_422;
1217 else
1218 pix_fmts = mpeg12_pixfmt_list_444;
1219
1220 return ff_get_format(avctx, pix_fmts);
1221 }
1222
1223 /* Call this function when we know all parameters.
1224 * It may be called in different places for MPEG-1 and MPEG-2. */
1225 static int mpeg_decode_postinit(AVCodecContext *avctx)
1226 {
1227 Mpeg1Context *s1 = avctx->priv_data;
1228 MpegEncContext *s = &s1->mpeg_enc_ctx;
1229 uint8_t old_permutation[64];
1230 int ret;
1231
1232 if ((s1->mpeg_enc_ctx_allocated == 0) ||
1233 avctx->coded_width != s->width ||
1234 avctx->coded_height != s->height ||
1235 s1->save_width != s->width ||
1236 s1->save_height != s->height ||
1237 s1->save_aspect_info != s->aspect_ratio_info ||
1238 s1->save_progressive_seq != s->progressive_sequence ||
1239 0) {
1240 if (s1->mpeg_enc_ctx_allocated) {
1241 ParseContext pc = s->parse_context;
1242 s->parse_context.buffer = 0;
1243 ff_mpv_common_end(s);
1244 s->parse_context = pc;
1245 }
1246
1247 ret = ff_set_dimensions(avctx, s->width, s->height);
1248 if (ret < 0)
1249 return ret;
1250
1251 avctx->bit_rate = s->bit_rate;
1252 s1->save_aspect_info = s->aspect_ratio_info;
1253 s1->save_width = s->width;
1254 s1->save_height = s->height;
1255 s1->save_progressive_seq = s->progressive_sequence;
1256
1257 /* low_delay may be forced, in this case we will have B-frames
1258 * that behave like P-frames. */
1259 avctx->has_b_frames = !s->low_delay;
1260
1261 if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1262 // MPEG-1 fps
1263 avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1264 // MPEG-1 aspect
1265 avctx->sample_aspect_ratio = av_d2q(1.0 / ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1266 avctx->ticks_per_frame = 1;
1267 } else { // MPEG-2
1268 // MPEG-2 fps
1269 av_reduce(&s->avctx->framerate.num,
1270 &s->avctx->framerate.den,
1271 ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num * 2,
1272 ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1273 1 << 30);
1274 avctx->ticks_per_frame = 2;
1275 // MPEG-2 aspect
1276 if (s->aspect_ratio_info > 1) {
1277 AVRational dar =
1278 av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1279 (AVRational) { s1->pan_scan.width,
1280 s1->pan_scan.height }),
1281 (AVRational) { s->width, s->height });
1282
1283 /* We ignore the spec here and guess a bit as reality does not
1284 * match the spec, see for example res_change_ffmpeg_aspect.ts
1285 * and sequence-display-aspect.mpg.
1286 * issue1613, 621, 562 */
1287 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1288 (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1289 av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1290 s->avctx->sample_aspect_ratio =
1291 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1292 (AVRational) { s->width, s->height });
1293 } else {
1294 s->avctx->sample_aspect_ratio =
1295 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1296 (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1297 // issue1613 4/3 16/9 -> 16/9
1298 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1299 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1300 // s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1301 ff_dlog(avctx, "A %d/%d\n",
1302 ff_mpeg2_aspect[s->aspect_ratio_info].num,
1303 ff_mpeg2_aspect[s->aspect_ratio_info].den);
1304 ff_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1305 s->avctx->sample_aspect_ratio.den);
1306 }
1307 } else {
1308 s->avctx->sample_aspect_ratio =
1309 ff_mpeg2_aspect[s->aspect_ratio_info];
1310 }
1311 } // MPEG-2
1312
1313 ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
1314
1315 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1316 // until then pix_fmt may be changed right after codec init
1317 #if FF_API_XVMC
1318 if ((avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT ||
1319 avctx->hwaccel) && avctx->idct_algo == FF_IDCT_AUTO)
1320 #else
1321 if (avctx->hwaccel && avctx->idct_algo == FF_IDCT_AUTO)
1322 #endif /* FF_API_XVMC */
1323 avctx->idct_algo = FF_IDCT_SIMPLE;
1324
1325 /* Quantization matrices may need reordering
1326 * if DCT permutation is changed. */
1327 memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1328
1329 ff_mpv_idct_init(s);
1330 if ((ret = ff_mpv_common_init(s)) < 0)
1331 return ret;
1332
1333 quant_matrix_rebuild(s->intra_matrix, old_permutation, s->idsp.idct_permutation);
1334 quant_matrix_rebuild(s->inter_matrix, old_permutation, s->idsp.idct_permutation);
1335 quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1336 quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1337
1338 s1->mpeg_enc_ctx_allocated = 1;
1339 }
1340 return 0;
1341 }
1342
1343 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1344 int buf_size)
1345 {
1346 Mpeg1Context *s1 = avctx->priv_data;
1347 MpegEncContext *s = &s1->mpeg_enc_ctx;
1348 int ref, f_code, vbv_delay;
1349
1350 init_get_bits(&s->gb, buf, buf_size * 8);
1351
1352 ref = get_bits(&s->gb, 10); /* temporal ref */
1353 s->pict_type = get_bits(&s->gb, 3);
1354 if (s->pict_type == 0 || s->pict_type > 3)
1355 return AVERROR_INVALIDDATA;
1356
1357 vbv_delay = get_bits(&s->gb, 16);
1358 if (s->pict_type == AV_PICTURE_TYPE_P ||
1359 s->pict_type == AV_PICTURE_TYPE_B) {
1360 s->full_pel[0] = get_bits1(&s->gb);
1361 f_code = get_bits(&s->gb, 3);
1362 if (f_code == 0 && (avctx->err_recognition & AV_EF_BITSTREAM))
1363 return AVERROR_INVALIDDATA;
1364 s->mpeg_f_code[0][0] = f_code;
1365 s->mpeg_f_code[0][1] = f_code;
1366 }
1367 if (s->pict_type == AV_PICTURE_TYPE_B) {
1368 s->full_pel[1] = get_bits1(&s->gb);
1369 f_code = get_bits(&s->gb, 3);
1370 if (f_code == 0 && (avctx->err_recognition & AV_EF_BITSTREAM))
1371 return AVERROR_INVALIDDATA;
1372 s->mpeg_f_code[1][0] = f_code;
1373 s->mpeg_f_code[1][1] = f_code;
1374 }
1375 s->current_picture.f->pict_type = s->pict_type;
1376 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1377
1378 if (avctx->debug & FF_DEBUG_PICT_INFO)
1379 av_log(avctx, AV_LOG_DEBUG,
1380 "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1381
1382 s->y_dc_scale = 8;
1383 s->c_dc_scale = 8;
1384 return 0;
1385 }
1386
1387 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1388 {
1389 MpegEncContext *s = &s1->mpeg_enc_ctx;
1390 int horiz_size_ext, vert_size_ext;
1391 int bit_rate_ext;
1392
1393 skip_bits(&s->gb, 1); /* profile and level esc*/
1394 s->avctx->profile = get_bits(&s->gb, 3);
1395 s->avctx->level = get_bits(&s->gb, 4);
1396 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1397 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1398 horiz_size_ext = get_bits(&s->gb, 2);
1399 vert_size_ext = get_bits(&s->gb, 2);
1400 s->width |= (horiz_size_ext << 12);
1401 s->height |= (vert_size_ext << 12);
1402 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1403 s->bit_rate += (bit_rate_ext << 18) * 400;
1404 skip_bits1(&s->gb); /* marker */
1405 s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1406
1407 s->low_delay = get_bits1(&s->gb);
1408 if (s->avctx->flags & CODEC_FLAG_LOW_DELAY)
1409 s->low_delay = 1;
1410
1411 s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1412 s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1413
1414 ff_dlog(s->avctx, "sequence extension\n");
1415 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1416
1417 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1418 av_log(s->avctx, AV_LOG_DEBUG,
1419 "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1420 s->avctx->profile, s->avctx->level,
1421 s->avctx->rc_buffer_size, s->bit_rate);
1422 }
1423
1424 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1425 {
1426 MpegEncContext *s = &s1->mpeg_enc_ctx;
1427 int color_description, w, h;
1428
1429 skip_bits(&s->gb, 3); /* video format */
1430 color_description = get_bits1(&s->gb);
1431 if (color_description) {
1432 s->avctx->color_primaries = get_bits(&s->gb, 8);
1433 s->avctx->color_trc = get_bits(&s->gb, 8);
1434 s->avctx->colorspace = get_bits(&s->gb, 8);
1435 }
1436 w = get_bits(&s->gb, 14);
1437 skip_bits(&s->gb, 1); // marker
1438 h = get_bits(&s->gb, 14);
1439 // remaining 3 bits are zero padding
1440
1441 s1->pan_scan.width = 16 * w;
1442 s1->pan_scan.height = 16 * h;
1443
1444 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1445 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1446 }
1447
1448 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1449 {
1450 MpegEncContext *s = &s1->mpeg_enc_ctx;
1451 int i, nofco;
1452
1453 nofco = 1;
1454 if (s->progressive_sequence) {
1455 if (s->repeat_first_field) {
1456 nofco++;
1457 if (s->top_field_first)
1458 nofco++;
1459 }
1460 } else {
1461 if (s->picture_structure == PICT_FRAME) {
1462 nofco++;
1463 if (s->repeat_first_field)
1464 nofco++;
1465 }
1466 }
1467 for (i = 0; i < nofco; i++) {
1468 s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1469 skip_bits(&s->gb, 1); // marker
1470 s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1471 skip_bits(&s->gb, 1); // marker
1472 }
1473
1474 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1475 av_log(s->avctx, AV_LOG_DEBUG,
1476 "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1477 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1478 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1479 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1480 }
1481
1482 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1483 uint16_t matrix1[64], int intra)
1484 {
1485 int i;
1486
1487 for (i = 0; i < 64; i++) {
1488 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1489 int v = get_bits(&s->gb, 8);
1490 if (v == 0) {
1491 av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1492 return AVERROR_INVALIDDATA;
1493 }
1494 if (intra && i == 0 && v != 8) {
1495 av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
1496 v = 8; // needed by pink.mpg / issue1046
1497 }
1498 matrix0[j] = v;
1499 if (matrix1)
1500 matrix1[j] = v;
1501 }
1502 return 0;
1503 }
1504
1505 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1506 {
1507 ff_dlog(s->avctx, "matrix extension\n");
1508
1509 if (get_bits1(&s->gb))
1510 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1511 if (get_bits1(&s->gb))
1512 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1513 if (get_bits1(&s->gb))
1514 load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1515 if (get_bits1(&s->gb))
1516 load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1517 }
1518
1519 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1520 {
1521 MpegEncContext *s = &s1->mpeg_enc_ctx;
1522
1523 s->full_pel[0] = s->full_pel[1] = 0;
1524 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1525 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1526 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1527 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1528 if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1529 av_log(s->avctx, AV_LOG_ERROR,
1530 "Missing picture start code, guessing missing values\n");
1531 if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1532 if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1533 s->pict_type = AV_PICTURE_TYPE_I;
1534 else
1535 s->pict_type = AV_PICTURE_TYPE_P;
1536 } else
1537 s->pict_type = AV_PICTURE_TYPE_B;
1538 s->current_picture.f->pict_type = s->pict_type;
1539 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1540 }
1541 s->intra_dc_precision = get_bits(&s->gb, 2);
1542 s->picture_structure = get_bits(&s->gb, 2);
1543 s->top_field_first = get_bits1(&s->gb);
1544 s->frame_pred_frame_dct = get_bits1(&s->gb);
1545 s->concealment_motion_vectors = get_bits1(&s->gb);
1546 s->q_scale_type = get_bits1(&s->gb);
1547 s->intra_vlc_format = get_bits1(&s->gb);
1548 s->alternate_scan = get_bits1(&s->gb);
1549 s->repeat_first_field = get_bits1(&s->gb);
1550 s->chroma_420_type = get_bits1(&s->gb);
1551 s->progressive_frame = get_bits1(&s->gb);
1552
1553 if (s->progressive_sequence && !s->progressive_frame) {
1554 s->progressive_frame = 1;
1555 av_log(s->avctx, AV_LOG_ERROR,
1556 "interlaced frame in progressive sequence, ignoring\n");
1557 }
1558
1559 if (s->picture_structure == 0 ||
1560 (s->progressive_frame && s->picture_structure != PICT_FRAME)) {
1561 av_log(s->avctx, AV_LOG_ERROR,
1562 "picture_structure %d invalid, ignoring\n",
1563 s->picture_structure);
1564 s->picture_structure = PICT_FRAME;
1565 }
1566
1567 if (s->progressive_sequence && !s->frame_pred_frame_dct)
1568 av_log(s->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
1569
1570 if (s->picture_structure == PICT_FRAME) {
1571 s->first_field = 0;
1572 s->v_edge_pos = 16 * s->mb_height;
1573 } else {
1574 s->first_field ^= 1;
1575 s->v_edge_pos = 8 * s->mb_height;
1576 memset(s->mbskip_table, 0, s->mb_stride * s->mb_height);
1577 }
1578
1579 if (s->alternate_scan) {
1580 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1581 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1582 } else {
1583 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1584 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1585 }
1586
1587 /* composite display not parsed */
1588 ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1589 ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1590 ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1591 ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1592 ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1593 ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1594 ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1595 ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1596 ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1597 }
1598
1599 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1600 {
1601 AVCodecContext *avctx = s->avctx;
1602 Mpeg1Context *s1 = (Mpeg1Context *) s;
1603 int ret;
1604
1605 /* start frame decoding */
1606 if (s->first_field || s->picture_structure == PICT_FRAME) {
1607 AVFrameSideData *pan_scan;
1608
1609 if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1610 return ret;
1611
1612 ff_mpeg_er_frame_start(s);
1613
1614 /* first check if we must repeat the frame */
1615 s->current_picture_ptr->f->repeat_pict = 0;
1616 if (s->repeat_first_field) {
1617 if (s->progressive_sequence) {
1618 if (s->top_field_first)
1619 s->current_picture_ptr->f->repeat_pict = 4;
1620 else
1621 s->current_picture_ptr->f->repeat_pict = 2;
1622 } else if (s->progressive_frame) {
1623 s->current_picture_ptr->f->repeat_pict = 1;
1624 }
1625 }
1626
1627 pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1628 AV_FRAME_DATA_PANSCAN,
1629 sizeof(s1->pan_scan));
1630 if (!pan_scan)
1631 return AVERROR(ENOMEM);
1632 memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1633
1634 if (s1->a53_caption) {
1635 AVFrameSideData *sd = av_frame_new_side_data(
1636 s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1637 s1->a53_caption_size);
1638 if (sd)
1639 memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1640 av_freep(&s1->a53_caption);
1641 }
1642
1643 if (s1->has_stereo3d) {
1644 AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1645 if (!stereo)
1646 return AVERROR(ENOMEM);
1647
1648 *stereo = s1->stereo3d;
1649 s1->has_stereo3d = 0;
1650 }
1651
1652 if (s1->has_afd) {
1653 AVFrameSideData *sd =
1654 av_frame_new_side_data(s->current_picture_ptr->f,
1655 AV_FRAME_DATA_AFD, 1);
1656 if (!sd)
1657 return AVERROR(ENOMEM);
1658
1659 *sd->data = s1->afd;
1660 s1->has_afd = 0;
1661 }
1662
1663 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1664 ff_thread_finish_setup(avctx);
1665 } else { // second field
1666 int i;
1667
1668 if (!s->current_picture_ptr) {
1669 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1670 return AVERROR_INVALIDDATA;
1671 }
1672
1673 if (s->avctx->hwaccel &&
1674 (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1675 if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1676 av_log(avctx, AV_LOG_ERROR,
1677 "hardware accelerator failed to decode first field\n");
1678 }
1679
1680 for (i = 0; i < 4; i++) {
1681 s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1682 if (s->picture_structure == PICT_BOTTOM_FIELD)
1683 s->current_picture.f->data[i] +=
1684 s->current_picture_ptr->f->linesize[i];
1685 }
1686 }
1687
1688 if (avctx->hwaccel) {
1689 if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1690 return ret;
1691 }
1692
1693 #if FF_API_XVMC
1694 FF_DISABLE_DEPRECATION_WARNINGS
1695 // ff_mpv_frame_start will call this function too,
1696 // but we need to call it on every field
1697 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1698 if (ff_xvmc_field_start(s, avctx) < 0)
1699 return -1;
1700 FF_ENABLE_DEPRECATION_WARNINGS
1701 #endif /* FF_API_XVMC */
1702
1703 return 0;
1704 }
1705
1706 #define DECODE_SLICE_ERROR -1
1707 #define DECODE_SLICE_OK 0
1708
1709 /**
1710 * Decode a slice.
1711 * MpegEncContext.mb_y must be set to the MB row from the startcode.
1712 * @return DECODE_SLICE_ERROR if the slice is damaged,
1713 * DECODE_SLICE_OK if this slice is OK
1714 */
1715 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1716 const uint8_t **buf, int buf_size)
1717 {
1718 AVCodecContext *avctx = s->avctx;
1719 const int field_pic = s->picture_structure != PICT_FRAME;
1720 int ret;
1721
1722 s->resync_mb_x =
1723 s->resync_mb_y = -1;
1724
1725 assert(mb_y < s->mb_height);
1726
1727 init_get_bits(&s->gb, *buf, buf_size * 8);
1728
1729 ff_mpeg1_clean_buffers(s);
1730 s->interlaced_dct = 0;
1731
1732 s->qscale = get_qscale(s);
1733
1734 if (s->qscale == 0) {
1735 av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1736 return AVERROR_INVALIDDATA;
1737 }
1738
1739 /* extra slice info */
1740 while (get_bits1(&s->gb) != 0)
1741 skip_bits(&s->gb, 8);
1742
1743 s->mb_x = 0;
1744
1745 if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1746 skip_bits1(&s->gb);
1747 } else {
1748 while (get_bits_left(&s->gb) > 0) {
1749 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1750 MBINCR_VLC_BITS, 2);
1751 if (code < 0) {
1752 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1753 return AVERROR_INVALIDDATA;
1754 }
1755 if (code >= 33) {
1756 if (code == 33)
1757 s->mb_x += 33;
1758 /* otherwise, stuffing, nothing to do */
1759 } else {
1760 s->mb_x += code;
1761 break;
1762 }
1763 }
1764 }
1765
1766 if (s->mb_x >= (unsigned) s->mb_width) {
1767 av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1768 return AVERROR_INVALIDDATA;
1769 }
1770
1771 if (avctx->hwaccel) {
1772 const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1773 int start_code = -1;
1774 buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1775 if (buf_end < *buf + buf_size)
1776 buf_end -= 4;
1777 s->mb_y = mb_y;
1778 if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1779 return DECODE_SLICE_ERROR;
1780 *buf = buf_end;
1781 return DECODE_SLICE_OK;
1782 }
1783
1784 s->resync_mb_x = s->mb_x;
1785 s->resync_mb_y = s->mb_y = mb_y;
1786 s->mb_skip_run = 0;
1787 ff_init_block_index(s);
1788
1789 if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1790 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1791 av_log(s->avctx, AV_LOG_DEBUG,
1792 "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",
1793 s->qscale,
1794 s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1795 s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1796 s->pict_type == AV_PICTURE_TYPE_I ? "I" :
1797 (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1798 (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1799 s->progressive_sequence ? "ps" : "",
1800 s->progressive_frame ? "pf" : "",
1801 s->alternate_scan ? "alt" : "",
1802 s->top_field_first ? "top" : "",
1803 s->intra_dc_precision, s->picture_structure,
1804 s->frame_pred_frame_dct, s->concealment_motion_vectors,
1805 s->q_scale_type, s->intra_vlc_format,
1806 s->repeat_first_field, s->chroma_420_type ? "420" : "");
1807 }
1808 }
1809
1810 for (;;) {
1811 #if FF_API_XVMC
1812 FF_DISABLE_DEPRECATION_WARNINGS
1813 // If 1, we memcpy blocks in xvmcvideo.
1814 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1815 ff_xvmc_init_block(s); // set s->block
1816 FF_ENABLE_DEPRECATION_WARNINGS
1817 #endif /* FF_API_XVMC */
1818
1819 if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1820 return ret;
1821
1822 // Note motion_val is normally NULL unless we want to extract the MVs.
1823 if (s->current_picture.motion_val[0] && !s->encoding) {
1824 const int wrap = s->b8_stride;
1825 int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1826 int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1827 int motion_x, motion_y, dir, i;
1828
1829 for (i = 0; i < 2; i++) {
1830 for (dir = 0; dir < 2; dir++) {
1831 if (s->mb_intra ||
1832 (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1833 motion_x = motion_y = 0;
1834 } else if (s->mv_type == MV_TYPE_16X16 ||
1835 (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1836 motion_x = s->mv[dir][0][0];
1837 motion_y = s->mv[dir][0][1];
1838 } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1839 motion_x = s->mv[dir][i][0];
1840 motion_y = s->mv[dir][i][1];
1841 }
1842
1843 s->current_picture.motion_val[dir][xy][0] = motion_x;
1844 s->current_picture.motion_val[dir][xy][1] = motion_y;
1845 s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1846 s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1847 s->current_picture.ref_index [dir][b8_xy] =
1848 s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1849 assert(s->field_select[dir][i] == 0 ||
1850 s->field_select[dir][i] == 1);
1851 }
1852 xy += wrap;
1853 b8_xy += 2;
1854 }
1855 }
1856
1857 s->dest[0] += 16;
1858 s->dest[1] += 16 >> s->chroma_x_shift;
1859 s->dest[2] += 16 >> s->chroma_x_shift;
1860
1861 ff_mpv_decode_mb(s, s->block);
1862
1863 if (++s->mb_x >= s->mb_width) {
1864 const int mb_size = 16;
1865
1866 ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1867 ff_mpv_report_decode_progress(s);
1868
1869 s->mb_x = 0;
1870 s->mb_y += 1 << field_pic;
1871
1872 if (s->mb_y >= s->mb_height) {
1873 int left = get_bits_left(&s->gb);
1874 int is_d10 = s->chroma_format == 2 &&
1875 s->pict_type == AV_PICTURE_TYPE_I &&
1876 avctx->profile == 0 && avctx->level == 5 &&
1877 s->intra_dc_precision == 2 &&
1878 s->q_scale_type == 1 && s->alternate_scan == 0 &&
1879 s->progressive_frame == 0
1880 /* vbv_delay == 0xBBB || 0xE10 */;
1881
1882 if (left < 0 ||
1883 (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1884 ((avctx->err_recognition & AV_EF_BUFFER) && left > 8)) {
1885 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
1886 left, show_bits(&s->gb, FFMIN(left, 23)));
1887 return AVERROR_INVALIDDATA;
1888 } else
1889 goto eos;
1890 }
1891
1892 ff_init_block_index(s);
1893 }
1894
1895 /* skip mb handling */
1896 if (s->mb_skip_run == -1) {
1897 /* read increment again */
1898 s->mb_skip_run = 0;
1899 for (;;) {
1900 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1901 MBINCR_VLC_BITS, 2);
1902 if (code < 0) {
1903 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1904 return AVERROR_INVALIDDATA;
1905 }
1906 if (code >= 33) {
1907 if (code == 33) {
1908 s->mb_skip_run += 33;
1909 } else if (code == 35) {
1910 if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1911 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1912 return AVERROR_INVALIDDATA;
1913 }
1914 goto eos; /* end of slice */
1915 }
1916 /* otherwise, stuffing, nothing to do */
1917 } else {
1918 s->mb_skip_run += code;
1919 break;
1920 }
1921 }
1922 if (s->mb_skip_run) {
1923 int i;
1924 if (s->pict_type == AV_PICTURE_TYPE_I) {
1925 av_log(s->avctx, AV_LOG_ERROR,
1926 "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1927 return AVERROR_INVALIDDATA;
1928 }
1929
1930 /* skip mb */
1931 s->mb_intra = 0;
1932 for (i = 0; i < 12; i++)
1933 s->block_last_index[i] = -1;
1934 if (s->picture_structure == PICT_FRAME)
1935 s->mv_type = MV_TYPE_16X16;
1936 else
1937 s->mv_type = MV_TYPE_FIELD;
1938 if (s->pict_type == AV_PICTURE_TYPE_P) {
1939 /* if P type, zero motion vector is implied */
1940 s->mv_dir = MV_DIR_FORWARD;
1941 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1942 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1943 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1944 s->field_select[0][0] = (s->picture_structure - 1) & 1;
1945 } else {
1946 /* if B type, reuse previous vectors and directions */
1947 s->mv[0][0][0] = s->last_mv[0][0][0];
1948 s->mv[0][0][1] = s->last_mv[0][0][1];
1949 s->mv[1][0][0] = s->last_mv[1][0][0];
1950 s->mv[1][0][1] = s->last_mv[1][0][1];
1951 }
1952 }
1953 }
1954 }
1955 eos: // end of slice
1956 *buf += (get_bits_count(&s->gb) - 1) / 8;
1957 ff_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1958 return 0;
1959 }
1960
1961 static int slice_decode_thread(AVCodecContext *c, void *arg)
1962 {
1963 MpegEncContext *s = *(void **) arg;
1964 const uint8_t *buf = s->gb.buffer;
1965 int mb_y = s->start_mb_y;
1966 const int field_pic = s->picture_structure != PICT_FRAME;
1967
1968 s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1969
1970 for (;;) {
1971 uint32_t start_code;
1972 int ret;
1973
1974 ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1975 emms_c();
1976 ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1977 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1978 s->start_mb_y, s->end_mb_y, s->er.error_count);
1979 if (ret < 0) {
1980 if (c->err_recognition & AV_EF_EXPLODE)
1981 return ret;
1982 if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1983 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1984 s->mb_x, s->mb_y,
1985 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
1986 } else {
1987 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1988 s->mb_x - 1, s->mb_y,
1989 ER_AC_END | ER_DC_END | ER_MV_END);
1990 }
1991
1992 if (s->mb_y == s->end_mb_y)
1993 return 0;
1994
1995 start_code = -1;
1996 buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
1997 mb_y = (start_code - SLICE_MIN_START_CODE) << field_pic;
1998 if (s->picture_structure == PICT_BOTTOM_FIELD)
1999 mb_y++;
2000 if (mb_y < 0 || mb_y >= s->end_mb_y)
2001 return AVERROR_INVALIDDATA;
2002 }
2003 }
2004
2005 /**
2006 * Handle slice ends.
2007 * @return 1 if it seems to be the last slice
2008 */
2009 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2010 {
2011 Mpeg1Context *s1 = avctx->priv_data;
2012 MpegEncContext *s = &s1->mpeg_enc_ctx;
2013
2014 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2015 return 0;
2016
2017 if (s->avctx->hwaccel) {
2018 if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
2019 av_log(avctx, AV_LOG_ERROR,
2020 "hardware accelerator failed to decode picture\n");
2021 }
2022
2023 #if FF_API_XVMC
2024 FF_DISABLE_DEPRECATION_WARNINGS
2025 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
2026 ff_xvmc_field_end(s);
2027 FF_ENABLE_DEPRECATION_WARNINGS
2028 #endif /* FF_API_XVMC */
2029
2030 /* end of slice reached */
2031 if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field) {
2032 /* end of image */
2033
2034 ff_er_frame_end(&s->er);
2035
2036 ff_mpv_frame_end(s);
2037
2038 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2039 int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2040 if (ret < 0)
2041 return ret;
2042 ff_print_debug_info(s, s->current_picture_ptr);
2043 } else {
2044 if (avctx->active_thread_type & FF_THREAD_FRAME)
2045 s->picture_number++;
2046 /* latency of 1 frame for I- and P-frames */
2047 /* XXX: use another variable than picture_number */
2048 if (s->last_picture_ptr) {
2049 int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2050 if (ret < 0)
2051 return ret;
2052 ff_print_debug_info(s, s->last_picture_ptr);
2053 }
2054 }
2055
2056 return 1;
2057 } else {
2058 return 0;
2059 }
2060 }
2061
2062 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2063 const uint8_t *buf, int buf_size)
2064 {
2065 Mpeg1Context *s1 = avctx->priv_data;
2066 MpegEncContext *s = &s1->mpeg_enc_ctx;
2067 int width, height;
2068 int i, v, j;
2069
2070 init_get_bits(&s->gb, buf, buf_size * 8);
2071
2072 width = get_bits(&s->gb, 12);
2073 height = get_bits(&s->gb, 12);
2074 if (width == 0 || height == 0) {
2075 av_log(avctx, AV_LOG_WARNING,
2076 "Invalid horizontal or vertical size value.\n");
2077 if (avctx->err_recognition & AV_EF_BITSTREAM)
2078 return AVERROR_INVALIDDATA;
2079 }
2080 s->aspect_ratio_info = get_bits(&s->gb, 4);
2081 if (s->aspect_ratio_info == 0) {
2082 av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2083 if (avctx->err_recognition & AV_EF_BITSTREAM)
2084 return AVERROR_INVALIDDATA;
2085 }
2086 s->frame_rate_index = get_bits(&s->gb, 4);
2087 if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2088 av_log(avctx, AV_LOG_WARNING,
2089 "frame_rate_index %d is invalid\n", s->frame_rate_index);
2090 return AVERROR_INVALIDDATA;
2091 }
2092 s->bit_rate = get_bits(&s->gb, 18) * 400;
2093 if (get_bits1(&s->gb) == 0) { /* marker */
2094 av_log(avctx, AV_LOG_ERROR, "Marker in sequence header missing\n");
2095 return AVERROR_INVALIDDATA;
2096 }
2097 s->width = width;
2098 s->height = height;
2099
2100 s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2101 skip_bits(&s->gb, 1);
2102
2103 /* get matrix */
2104 if (get_bits1(&s->gb)) {
2105 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2106 } else {
2107 for (i = 0; i < 64; i++) {
2108 j = s->idsp.idct_permutation[i];
2109 v = ff_mpeg1_default_intra_matrix[i];
2110 s->intra_matrix[j] = v;
2111 s->chroma_intra_matrix[j] = v;
2112 }
2113 }
2114 if (get_bits1(&s->gb)) {
2115 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2116 } else {
2117 for (i = 0; i < 64; i++) {
2118 int j = s->idsp.idct_permutation[i];
2119 v = ff_mpeg1_default_non_intra_matrix[i];
2120 s->inter_matrix[j] = v;
2121 s->chroma_inter_matrix[j] = v;
2122 }
2123 }
2124
2125 if (show_bits(&s->gb, 23) != 0) {
2126 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2127 return AVERROR_INVALIDDATA;
2128 }
2129
2130 /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2131 s->progressive_sequence = 1;
2132 s->progressive_frame = 1;
2133 s->picture_structure = PICT_FRAME;
2134 s->frame_pred_frame_dct = 1;
2135 s->chroma_format = 1;
2136 s->codec_id =
2137 s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2138 s->out_format = FMT_MPEG1;
2139 if (s->avctx->flags & CODEC_FLAG_LOW_DELAY)
2140 s->low_delay = 1;
2141
2142 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2143 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2144 s->avctx->rc_buffer_size, s->bit_rate);
2145
2146 return 0;
2147 }
2148
2149 static int vcr2_init_sequence(AVCodecContext *avctx)
2150 {
2151 Mpeg1Context *s1 = avctx->priv_data;
2152 MpegEncContext *s = &s1->mpeg_enc_ctx;
2153 int i, v, ret;
2154
2155 /* start new MPEG-1 context decoding */
2156 s->out_format = FMT_MPEG1;
2157 if (s1->mpeg_enc_ctx_allocated) {
2158 ff_mpv_common_end(s);
2159 }
2160 s->width = avctx->coded_width;
2161 s->height = avctx->coded_height;
2162 avctx->has_b_frames = 0; // true?
2163 s->low_delay = 1;
2164
2165 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2166
2167 #if FF_API_XVMC
2168 if ((avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel) &&
2169 avctx->idct_algo == FF_IDCT_AUTO)
2170 #else
2171 if (avctx->hwaccel && avctx->idct_algo == FF_IDCT_AUTO)
2172 #endif /* FF_API_XVMC */
2173 avctx->idct_algo = FF_IDCT_SIMPLE;
2174
2175 ff_mpv_idct_init(s);
2176 if ((ret = ff_mpv_common_init(s)) < 0)
2177 return ret;
2178 s1->mpeg_enc_ctx_allocated = 1;
2179
2180 for (i = 0; i < 64; i++) {
2181 int j = s->idsp.idct_permutation[i];
2182 v = ff_mpeg1_default_intra_matrix[i];
2183 s->intra_matrix[j] = v;
2184 s->chroma_intra_matrix[j] = v;
2185
2186 v = ff_mpeg1_default_non_intra_matrix[i];
2187 s->inter_matrix[j] = v;
2188 s->chroma_inter_matrix[j] = v;
2189 }
2190
2191 s->progressive_sequence = 1;
2192 s->progressive_frame = 1;
2193 s->picture_structure = PICT_FRAME;
2194 s->frame_pred_frame_dct = 1;
2195 s->chroma_format = 1;
2196 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2197 s1->save_width = s->width;
2198 s1->save_height = s->height;
2199 s1->save_progressive_seq = s->progressive_sequence;
2200 return 0;
2201 }
2202
2203 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2204 const uint8_t *p, int buf_size)
2205 {
2206 Mpeg1Context *s1 = avctx->priv_data;
2207
2208 if (buf_size >= 6 &&
2209 p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2210 p[4] == 3 && (p[5] & 0x40)) {
2211 /* extract A53 Part 4 CC data */
2212 int cc_count = p[5] & 0x1f;
2213 if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2214 av_freep(&s1->a53_caption);
2215 s1->a53_caption_size = cc_count * 3;
2216 s1->a53_caption = av_malloc(s1->a53_caption_size);
2217 if (s1->a53_caption)
2218 memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2219 }
2220 return 1;
2221 } else if (buf_size >= 11 &&
2222 p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2223 /* extract DVD CC data */
2224 int cc_count = 0;
2225 int i;
2226 // There is a caption count field in the data, but it is often
2227 // incorect. So count the number of captions present.
2228 for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2229 cc_count++;
2230 // Transform the DVD format into A53 Part 4 format
2231 if (cc_count > 0) {
2232 av_freep(&s1->a53_caption);
2233 s1->a53_caption_size = cc_count * 6;
2234 s1->a53_caption = av_malloc(s1->a53_caption_size);
2235 if (s1->a53_caption) {
2236 uint8_t field1 = !!(p[4] & 0x80);
2237 uint8_t *cap = s1->a53_caption;
2238 p += 5;
2239 for (i = 0; i < cc_count; i++) {
2240 cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2241 cap[1] = p[1];
2242 cap[2] = p[2];
2243 cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2244 cap[4] = p[4];
2245 cap[5] = p[5];
2246 cap += 6;
2247 p += 6;
2248 }
2249 }
2250 }
2251 return 1;
2252 }
2253 return 0;
2254 }
2255
2256 static void mpeg_decode_user_data(AVCodecContext *avctx,
2257 const uint8_t *p, int buf_size)
2258 {
2259 const uint8_t *buf_end = p + buf_size;
2260 Mpeg1Context *s1 = avctx->priv_data;
2261
2262 /* we parse the DTG active format information */
2263 if (buf_end - p >= 5 &&
2264 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2265 int flags = p[4];
2266 p += 5;
2267 if (flags & 0x80) {
2268 /* skip event id */
2269 p += 2;
2270 }
2271 if (flags & 0x40) {
2272 if (buf_end - p < 1)
2273 return;
2274 #if FF_API_AFD
2275 FF_DISABLE_DEPRECATION_WARNINGS
2276 avctx->dtg_active_format = p[0] & 0x0f;
2277 FF_ENABLE_DEPRECATION_WARNINGS
2278 #endif /* FF_API_AFD */
2279 s1->has_afd = 1;
2280 s1->afd = p[0] & 0x0f;
2281 }
2282 } else if (buf_end - p >= 6 &&
2283 p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2284 p[4] == 0x03) { // S3D_video_format_length
2285 // the 0x7F mask ignores the reserved_bit value
2286 const uint8_t S3D_video_format_type = p[5] & 0x7F;
2287
2288 if (S3D_video_format_type == 0x03 ||
2289 S3D_video_format_type == 0x04 ||
2290 S3D_video_format_type == 0x08 ||
2291 S3D_video_format_type == 0x23) {
2292
2293 s1->has_stereo3d = 1;
2294
2295 switch (S3D_video_format_type) {
2296 case 0x03:
2297 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2298 break;
2299 case 0x04:
2300 s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2301 break;
2302 case 0x08:
2303 s1->stereo3d.type = AV_STEREO3D_2D;
2304 break;
2305 case 0x23:
2306 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2307 break;
2308 }
2309 }
2310 } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2311 return;
2312 }
2313 }
2314
2315 static void mpeg_decode_gop(AVCodecContext *avctx,
2316 const uint8_t *buf, int buf_size)
2317 {
2318 Mpeg1Context *s1 = avctx->priv_data;
2319 MpegEncContext *s = &s1->mpeg_enc_ctx;
2320
2321 int time_code_hours, time_code_minutes;
2322 int time_code_seconds, time_code_pictures;
2323 int broken_link;
2324
2325 init_get_bits(&s->gb, buf, buf_size * 8);
2326
2327 skip_bits1(&s->gb); /* drop_frame_flag */
2328
2329 time_code_hours = get_bits(&s->gb, 5);
2330 time_code_minutes = get_bits(&s->gb, 6);
2331 skip_bits1(&s->gb); // marker bit
2332 time_code_seconds = get_bits(&s->gb, 6);
2333 time_code_pictures = get_bits(&s->gb, 6);
2334
2335 s1->closed_gop = get_bits1(&s->gb);
2336 /* broken_link indicate that after editing the
2337 * reference frames of the first B-Frames after GOP I-Frame
2338 * are missing (open gop) */
2339 broken_link = get_bits1(&s->gb);
2340
2341 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2342 av_log(s->avctx, AV_LOG_DEBUG,
2343 "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2344 time_code_hours, time_code_minutes, time_code_seconds,
2345 time_code_pictures, s1->closed_gop, broken_link);
2346 }
2347
2348 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2349 int *got_output, const uint8_t *buf, int buf_size)
2350 {
2351 Mpeg1Context *s = avctx->priv_data;
2352 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2353 const uint8_t *buf_ptr = buf;
2354 const uint8_t *buf_end = buf + buf_size;
2355 int ret, input_size;
2356 int last_code = 0, skip_frame = 0;
2357
2358 for (;;) {
2359 /* find next start code */
2360 uint32_t start_code = -1;
2361 buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2362 if (start_code > 0x1ff) {
2363 if (!skip_frame) {
2364 if (HAVE_THREADS &&
2365 (avctx->active_thread_type & FF_THREAD_SLICE) &&
2366 !avctx->hwaccel) {
2367 int i;
2368
2369 avctx->execute(avctx, slice_decode_thread,
2370 &s2->thread_context[0], NULL,
2371 s->slice_count, sizeof(void *));
2372 for (i = 0; i < s->slice_count; i++)
2373 s2->er.error_count += s2->thread_context[i]->er.error_count;
2374 }
2375
2376 ret = slice_end(avctx, picture);
2377 if (ret < 0)
2378 return ret;
2379 else if (ret) {
2380 // FIXME: merge with the stuff in mpeg_decode_slice
2381 if (s2->last_picture_ptr || s2->low_delay)
2382 *got_output = 1;
2383 }
2384 }
2385 s2->pict_type = 0;
2386 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2387 }
2388
2389 input_size = buf_end - buf_ptr;
2390
2391 if (avctx->debug & FF_DEBUG_STARTCODE)
2392 av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %td left %d\n",
2393 start_code, buf_ptr - buf, input_size);
2394
2395 /* prepare data for next start code */
2396 switch (start_code) {
2397 case SEQ_START_CODE:
2398 if (last_code == 0) {
2399 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2400 s->sync = 1;
2401 } else {
2402 av_log(avctx, AV_LOG_ERROR,
2403 "ignoring SEQ_START_CODE after %X\n", last_code);
2404 if (avctx->err_recognition & AV_EF_EXPLODE)
2405 return AVERROR_INVALIDDATA;
2406 }
2407 break;
2408
2409 case PICTURE_START_CODE:
2410 if (s2->width <= 0 || s2->height <= 0) {
2411 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2412 s2->width, s2->height);
2413 return AVERROR_INVALIDDATA;
2414 }
2415
2416 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2417 !avctx->hwaccel && s->slice_count) {
2418 int i;
2419
2420 avctx->execute(avctx, slice_decode_thread,
2421 s2->thread_context, NULL,
2422 s->slice_count, sizeof(void *));
2423 for (i = 0; i < s->slice_count; i++)
2424 s2->er.error_count += s2->thread_context[i]->er.error_count;
2425 s->slice_count = 0;
2426 }
2427 if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2428 ret = mpeg_decode_postinit(avctx);
2429 if (ret < 0) {
2430 av_log(avctx, AV_LOG_ERROR,
2431 "mpeg_decode_postinit() failure\n");
2432 return ret;
2433 }
2434
2435 /* We have a complete image: we try to decompress it. */
2436 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2437 s2->pict_type = 0;
2438 s->first_slice = 1;
2439 last_code = PICTURE_START_CODE;
2440 } else {
2441 av_log(avctx, AV_LOG_ERROR,
2442 "ignoring pic after %X\n", last_code);
2443 if (avctx->err_recognition & AV_EF_EXPLODE)
2444 return AVERROR_INVALIDDATA;
2445 }
2446 break;
2447 case EXT_START_CODE:
2448 init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2449
2450 switch (get_bits(&s2->gb, 4)) {
2451 case 0x1:
2452 if (last_code == 0) {
2453 mpeg_decode_sequence_extension(s);
2454 } else {
2455 av_log(avctx, AV_LOG_ERROR,
2456 "ignoring seq ext after %X\n", last_code);
2457 if (avctx->err_recognition & AV_EF_EXPLODE)
2458 return AVERROR_INVALIDDATA;
2459 }
2460 break;
2461 case 0x2:
2462 mpeg_decode_sequence_display_extension(s);
2463 break;
2464 case 0x3:
2465 mpeg_decode_quant_matrix_extension(s2);
2466 break;
2467 case 0x7:
2468 mpeg_decode_picture_display_extension(s);
2469 break;
2470 case 0x8:
2471 if (last_code == PICTURE_START_CODE) {
2472 mpeg_decode_picture_coding_extension(s);
2473 } else {
2474 av_log(avctx, AV_LOG_ERROR,
2475 "ignoring pic cod ext after %X\n", last_code);
2476 if (avctx->err_recognition & AV_EF_EXPLODE)
2477 return AVERROR_INVALIDDATA;
2478 }
2479 break;
2480 }
2481 break;
2482 case USER_START_CODE:
2483 mpeg_decode_user_data(avctx, buf_ptr, input_size);
2484 break;
2485 case GOP_START_CODE:
2486 if (last_code == 0) {
2487 s2->first_field = 0;
2488 mpeg_decode_gop(avctx, buf_ptr, input_size);
2489 s->sync = 1;
2490 } else {
2491 av_log(avctx, AV_LOG_ERROR,
2492 "ignoring GOP_START_CODE after %X\n", last_code);
2493 if (avctx->err_recognition & AV_EF_EXPLODE)
2494 return AVERROR_INVALIDDATA;
2495 }
2496 break;
2497 default:
2498 if (start_code >= SLICE_MIN_START_CODE &&
2499 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2500 const int field_pic = s2->picture_structure != PICT_FRAME;
2501 int mb_y = (start_code - SLICE_MIN_START_CODE) << field_pic;
2502 last_code = SLICE_MIN_START_CODE;
2503
2504 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2505 mb_y++;
2506
2507 if (mb_y >= s2->mb_height) {
2508 av_log(s2->avctx, AV_LOG_ERROR,
2509 "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2510 return AVERROR_INVALIDDATA;
2511 }
2512
2513 if (!s2->last_picture_ptr) {
2514 /* Skip B-frames if we do not have reference frames and
2515 * GOP is not closed. */
2516 if (s2->pict_type == AV_PICTURE_TYPE_B) {
2517 if (!s->closed_gop) {
2518 skip_frame = 1;
2519 break;
2520 }
2521 }
2522 }
2523 if (s2->pict_type == AV_PICTURE_TYPE_I)
2524 s->sync = 1;
2525 if (!s2->next_picture_ptr) {
2526 /* Skip P-frames if we do not have a reference frame or
2527 * we have an invalid header. */
2528 if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2529 skip_frame = 1;
2530 break;
2531 }
2532 }
2533 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2534 s2->pict_type == AV_PICTURE_TYPE_B) ||
2535 (avctx->skip_frame >= AVDISCARD_NONKEY &&
2536 s2->pict_type != AV_PICTURE_TYPE_I) ||
2537 avctx->skip_frame >= AVDISCARD_ALL) {
2538 skip_frame = 1;
2539 break;
2540 }
2541
2542 if (!s->mpeg_enc_ctx_allocated)
2543 break;
2544
2545 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2546 if (mb_y < avctx->skip_top ||
2547 mb_y >= s2->mb_height - avctx->skip_bottom)
2548 break;
2549 }
2550
2551 if (!s2->pict_type) {
2552 av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2553 if (avctx->err_recognition & AV_EF_EXPLODE)
2554 return AVERROR_INVALIDDATA;
2555 break;
2556 }
2557
2558 if (s->first_slice) {
2559 skip_frame = 0;
2560 s->first_slice = 0;
2561 if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2562 return ret;
2563 }
2564 if (!s2->current_picture_ptr) {
2565 av_log(avctx, AV_LOG_ERROR,
2566 "current_picture not initialized\n");
2567 return AVERROR_INVALIDDATA;
2568 }
2569
2570 if (HAVE_THREADS &&
2571 (avctx->active_thread_type & FF_THREAD_SLICE) &&
2572 !avctx->hwaccel) {
2573 int threshold = (s2->mb_height * s->slice_count +
2574 s2->slice_context_count / 2) /
2575 s2->slice_context_count;
2576 if (threshold <= mb_y) {
2577 MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2578
2579 thread_context->start_mb_y = mb_y;
2580 thread_context->end_mb_y = s2->mb_height;
2581 if (s->slice_count) {
2582 s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2583 ret = ff_update_duplicate_context(thread_context, s2);
2584 if (ret < 0)
2585 return ret;
2586 }
2587 init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2588 s->slice_count++;
2589 }
2590 buf_ptr += 2; // FIXME add minimum number of bytes per slice
2591 } else {
2592 ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2593 emms_c();
2594
2595 if (ret < 0) {
2596 if (avctx->err_recognition & AV_EF_EXPLODE)
2597 return ret;
2598 if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2599 ff_er_add_slice(&s2->er, s2->resync_mb_x,
2600 s2->resync_mb_y, s2->mb_x, s2->mb_y,
2601 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2602 } else {
2603 ff_er_add_slice(&s2->er, s2->resync_mb_x,
2604 s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2605 ER_AC_END | ER_DC_END | ER_MV_END);
2606 }
2607 }
2608 }
2609 break;
2610 }
2611 }
2612 }
2613
2614 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2615 int *got_output, AVPacket *avpkt)
2616 {
2617 const uint8_t *buf = avpkt->data;
2618 int buf_size = avpkt->size;
2619 Mpeg1Context *s = avctx->priv_data;
2620 AVFrame *picture = data;
2621 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2622 ff_dlog(avctx, "fill_buffer\n");
2623
2624 if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2625 /* special case for last picture */
2626 if (s2->low_delay == 0 && s2->next_picture_ptr) {
2627 int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2628 if (ret < 0)
2629 return ret;
2630
2631 s2->next_picture_ptr = NULL;
2632
2633 *got_output = 1;
2634 }
2635 return buf_size;
2636 }
2637
2638 if (s2->avctx->flags & CODEC_FLAG_TRUNCATED) {
2639 int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2640 buf_size, NULL);
2641
2642 if (ff_combine_frame(&s2->parse_context, next,
2643 (const uint8_t **) &buf, &buf_size) < 0)
2644 return buf_size;
2645 }
2646
2647 if (s->mpeg_enc_ctx_allocated == 0 && avctx->codec_tag == AV_RL32("VCR2"))
2648 vcr2_init_sequence(avctx);
2649
2650 s->slice_count = 0;
2651
2652 if (avctx->extradata && !s->extradata_decoded) {
2653 int ret = decode_chunks(avctx, picture, got_output,
2654 avctx->extradata, avctx->extradata_size);
2655 s->extradata_decoded = 1;
2656 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
2657 return ret;
2658 }
2659
2660 return decode_chunks(avctx, picture, got_output, buf, buf_size);
2661 }
2662
2663 static void flush(AVCodecContext *avctx)
2664 {
2665 Mpeg1Context *s = avctx->priv_data;
2666
2667 s->sync = 0;
2668 s->closed_gop = 0;
2669
2670 ff_mpeg_flush(avctx);
2671 }
2672
2673 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2674 {
2675 Mpeg1Context *s = avctx->priv_data;
2676
2677 if (s->mpeg_enc_ctx_allocated)
2678 ff_mpv_common_end(&s->mpeg_enc_ctx);
2679 av_freep(&s->a53_caption);
2680 return 0;
2681 }
2682
2683 static const AVProfile mpeg2_video_profiles[] = {
2684 { FF_PROFILE_MPEG2_422, "4:2:2" },
2685 { FF_PROFILE_MPEG2_HIGH, "High" },
2686 { FF_PROFILE_MPEG2_SS, "Spatially Scalable" },
2687 { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable" },
2688 { FF_PROFILE_MPEG2_MAIN, "Main" },
2689 { FF_PROFILE_MPEG2_SIMPLE, "Simple" },
2690 { FF_PROFILE_RESERVED, "Reserved" },
2691 { FF_PROFILE_RESERVED, "Reserved" },
2692 { FF_PROFILE_UNKNOWN },
2693 };
2694
2695 AVCodec ff_mpeg1video_decoder = {
2696 .name = "mpeg1video",
2697 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2698 .type = AVMEDIA_TYPE_VIDEO,
2699 .id = AV_CODEC_ID_MPEG1VIDEO,
2700 .priv_data_size = sizeof(Mpeg1Context),
2701 .init = mpeg_decode_init,
2702 .close = mpeg_decode_end,
2703 .decode = mpeg_decode_frame,
2704 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2705 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2706 CODEC_CAP_SLICE_THREADS,
2707 .flush = flush,
2708 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2709 };
2710
2711 AVCodec ff_mpeg2video_decoder = {
2712 .name = "mpeg2video",
2713 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2714 .type = AVMEDIA_TYPE_VIDEO,
2715 .id = AV_CODEC_ID_MPEG2VIDEO,
2716 .priv_data_size = sizeof(Mpeg1Context),
2717 .init = mpeg_decode_init,
2718 .close = mpeg_decode_end,
2719 .decode = mpeg_decode_frame,
2720 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2721 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2722 CODEC_CAP_SLICE_THREADS,
2723 .flush = flush,
2724 .profiles = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2725 };
2726
2727 #if FF_API_XVMC
2728 #if CONFIG_MPEG_XVMC_DECODER
2729 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2730 {
2731 if (avctx->active_thread_type & FF_THREAD_SLICE)
2732 return -1;
2733 if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2734 return -1;
2735 if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2736 ff_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2737 }
2738 mpeg_decode_init(avctx);
2739
2740 avctx->pix_fmt = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2741 avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2742
2743 return 0;
2744 }
2745
2746 AVCodec ff_mpeg_xvmc_decoder = {
2747 .name = "mpegvideo_xvmc",
2748 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2749 .type = AVMEDIA_TYPE_VIDEO,
2750 .id = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2751 .priv_data_size = sizeof(Mpeg1Context),
2752 .init = mpeg_mc_decode_init,
2753 .close = mpeg_decode_end,
2754 .decode = mpeg_decode_frame,
2755 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2756 CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2757 .flush = flush,
2758 };
2759
2760 #endif
2761 #endif /* FF_API_XVMC */