lavc: Add an internal wrapper around get_format()
[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 "dsputil.h"
37 #include "error_resilience.h"
38 #include "internal.h"
39 #include "mpeg12.h"
40 #include "mpeg12data.h"
41 #include "mpegutils.h"
42 #include "mpegvideo.h"
43 #include "thread.h"
44 #include "version.h"
45 #include "xvmc_internal.h"
46
47 typedef struct Mpeg1Context {
48 MpegEncContext mpeg_enc_ctx;
49 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
50 int repeat_field; /* true if we must repeat the field */
51 AVPanScan pan_scan; /* some temporary storage for the panscan */
52 AVStereo3D stereo3d;
53 int has_stereo3d;
54 uint8_t *a53_caption;
55 int a53_caption_size;
56 int slice_count;
57 int save_aspect_info;
58 int save_width, save_height, save_progressive_seq;
59 AVRational frame_rate_ext; /* MPEG-2 specific framerate modificator */
60 int sync; /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
61 int closed_gop; /* GOP is closed */
62 int first_slice;
63 int extradata_decoded;
64 } Mpeg1Context;
65
66 #define MB_TYPE_ZERO_MV 0x20000000
67
68 static const uint32_t ptype2mb_type[7] = {
69 MB_TYPE_INTRA,
70 MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
71 MB_TYPE_L0,
72 MB_TYPE_L0 | MB_TYPE_CBP,
73 MB_TYPE_QUANT | MB_TYPE_INTRA,
74 MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
75 MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
76 };
77
78 static const uint32_t btype2mb_type[11] = {
79 MB_TYPE_INTRA,
80 MB_TYPE_L1,
81 MB_TYPE_L1 | MB_TYPE_CBP,
82 MB_TYPE_L0,
83 MB_TYPE_L0 | MB_TYPE_CBP,
84 MB_TYPE_L0L1,
85 MB_TYPE_L0L1 | MB_TYPE_CBP,
86 MB_TYPE_QUANT | MB_TYPE_INTRA,
87 MB_TYPE_QUANT | MB_TYPE_L1 | MB_TYPE_CBP,
88 MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
89 MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
90 };
91
92 static const uint8_t non_linear_qscale[32] = {
93 0, 1, 2, 3, 4, 5, 6, 7,
94 8, 10, 12, 14, 16, 18, 20, 22,
95 24, 28, 32, 36, 40, 44, 48, 52,
96 56, 64, 72, 80, 88, 96, 104, 112,
97 };
98
99 /* as H.263, but only 17 codes */
100 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
101 {
102 int code, sign, val, shift;
103
104 code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
105 if (code == 0)
106 return pred;
107 if (code < 0)
108 return 0xffff;
109
110 sign = get_bits1(&s->gb);
111 shift = fcode - 1;
112 val = code;
113 if (shift) {
114 val = (val - 1) << shift;
115 val |= get_bits(&s->gb, shift);
116 val++;
117 }
118 if (sign)
119 val = -val;
120 val += pred;
121
122 /* modulo decoding */
123 return sign_extend(val, 5 + shift);
124 }
125
126 #define check_scantable_index(ctx, x) \
127 do { \
128 if ((x) > 63) { \
129 av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", \
130 ctx->mb_x, ctx->mb_y); \
131 return AVERROR_INVALIDDATA; \
132 } \
133 } while (0)
134
135 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
136 int16_t *block, int n)
137 {
138 int level, dc, diff, i, j, run;
139 int component;
140 RLTable *rl = &ff_rl_mpeg1;
141 uint8_t *const scantable = s->intra_scantable.permutated;
142 const uint16_t *quant_matrix = s->intra_matrix;
143 const int qscale = s->qscale;
144
145 /* DC coefficient */
146 component = (n <= 3 ? 0 : n - 4 + 1);
147 diff = decode_dc(&s->gb, component);
148 if (diff >= 0xffff)
149 return -1;
150 dc = s->last_dc[component];
151 dc += diff;
152 s->last_dc[component] = dc;
153 block[0] = dc * quant_matrix[0];
154 av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
155 i = 0;
156 {
157 OPEN_READER(re, &s->gb);
158 /* now quantify & encode AC coefficients */
159 for (;;) {
160 UPDATE_CACHE(re, &s->gb);
161 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
162 TEX_VLC_BITS, 2, 0);
163
164 if (level == 127) {
165 break;
166 } else if (level != 0) {
167 i += run;
168 check_scantable_index(s, i);
169 j = scantable[i];
170 level = (level * qscale * quant_matrix[j]) >> 4;
171 level = (level - 1) | 1;
172 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
173 SHOW_SBITS(re, &s->gb, 1);
174 LAST_SKIP_BITS(re, &s->gb, 1);
175 } else {
176 /* escape */
177 run = SHOW_UBITS(re, &s->gb, 6) + 1;
178 LAST_SKIP_BITS(re, &s->gb, 6);
179 UPDATE_CACHE(re, &s->gb);
180 level = SHOW_SBITS(re, &s->gb, 8);
181 SKIP_BITS(re, &s->gb, 8);
182 if (level == -128) {
183 level = SHOW_UBITS(re, &s->gb, 8) - 256;
184 LAST_SKIP_BITS(re, &s->gb, 8);
185 } else if (level == 0) {
186 level = SHOW_UBITS(re, &s->gb, 8);
187 LAST_SKIP_BITS(re, &s->gb, 8);
188 }
189 i += run;
190 check_scantable_index(s, i);
191 j = scantable[i];
192 if (level < 0) {
193 level = -level;
194 level = (level * qscale * quant_matrix[j]) >> 4;
195 level = (level - 1) | 1;
196 level = -level;
197 } else {
198 level = (level * qscale * quant_matrix[j]) >> 4;
199 level = (level - 1) | 1;
200 }
201 }
202
203 block[j] = level;
204 }
205 CLOSE_READER(re, &s->gb);
206 }
207 s->block_last_index[n] = i;
208 return 0;
209 }
210
211 int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
212 {
213 return mpeg1_decode_block_intra(s, block, n);
214 }
215
216 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
217 int16_t *block, int n)
218 {
219 int level, i, j, run;
220 RLTable *rl = &ff_rl_mpeg1;
221 uint8_t *const scantable = s->intra_scantable.permutated;
222 const uint16_t *quant_matrix = s->inter_matrix;
223 const int qscale = s->qscale;
224
225 {
226 OPEN_READER(re, &s->gb);
227 i = -1;
228 // special case for first coefficient, no need to add second VLC table
229 UPDATE_CACHE(re, &s->gb);
230 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
231 level = (3 * qscale * quant_matrix[0]) >> 5;
232 level = (level - 1) | 1;
233 if (GET_CACHE(re, &s->gb) & 0x40000000)
234 level = -level;
235 block[0] = level;
236 i++;
237 SKIP_BITS(re, &s->gb, 2);
238 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
239 goto end;
240 }
241 /* now quantify & encode AC coefficients */
242 for (;;) {
243 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
244 TEX_VLC_BITS, 2, 0);
245
246 if (level != 0) {
247 i += run;
248 check_scantable_index(s, i);
249 j = scantable[i];
250 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
251 level = (level - 1) | 1;
252 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
253 SHOW_SBITS(re, &s->gb, 1);
254 SKIP_BITS(re, &s->gb, 1);
255 } else {
256 /* escape */
257 run = SHOW_UBITS(re, &s->gb, 6) + 1;
258 LAST_SKIP_BITS(re, &s->gb, 6);
259 UPDATE_CACHE(re, &s->gb);
260 level = SHOW_SBITS(re, &s->gb, 8);
261 SKIP_BITS(re, &s->gb, 8);
262 if (level == -128) {
263 level = SHOW_UBITS(re, &s->gb, 8) - 256;
264 SKIP_BITS(re, &s->gb, 8);
265 } else if (level == 0) {
266 level = SHOW_UBITS(re, &s->gb, 8);
267 SKIP_BITS(re, &s->gb, 8);
268 }
269 i += run;
270 check_scantable_index(s, i);
271 j = scantable[i];
272 if (level < 0) {
273 level = -level;
274 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
275 level = (level - 1) | 1;
276 level = -level;
277 } else {
278 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
279 level = (level - 1) | 1;
280 }
281 }
282
283 block[j] = level;
284 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
285 break;
286 UPDATE_CACHE(re, &s->gb);
287 }
288 end:
289 LAST_SKIP_BITS(re, &s->gb, 2);
290 CLOSE_READER(re, &s->gb);
291 }
292 s->block_last_index[n] = i;
293 return 0;
294 }
295
296 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
297 int16_t *block, int n)
298 {
299 int level, i, j, run;
300 RLTable *rl = &ff_rl_mpeg1;
301 uint8_t *const scantable = s->intra_scantable.permutated;
302 const int qscale = s->qscale;
303
304 {
305 OPEN_READER(re, &s->gb);
306 i = -1;
307 // Special case for first coefficient, no need to add second VLC table.
308 UPDATE_CACHE(re, &s->gb);
309 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
310 level = (3 * qscale) >> 1;
311 level = (level - 1) | 1;
312 if (GET_CACHE(re, &s->gb) & 0x40000000)
313 level = -level;
314 block[0] = level;
315 i++;
316 SKIP_BITS(re, &s->gb, 2);
317 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
318 goto end;
319 }
320
321 /* now quantify & encode AC coefficients */
322 for (;;) {
323 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
324 TEX_VLC_BITS, 2, 0);
325
326 if (level != 0) {
327 i += run;
328 check_scantable_index(s, i);
329 j = scantable[i];
330 level = ((level * 2 + 1) * qscale) >> 1;
331 level = (level - 1) | 1;
332 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
333 SHOW_SBITS(re, &s->gb, 1);
334 SKIP_BITS(re, &s->gb, 1);
335 } else {
336 /* escape */
337 run = SHOW_UBITS(re, &s->gb, 6) + 1;
338 LAST_SKIP_BITS(re, &s->gb, 6);
339 UPDATE_CACHE(re, &s->gb);
340 level = SHOW_SBITS(re, &s->gb, 8);
341 SKIP_BITS(re, &s->gb, 8);
342 if (level == -128) {
343 level = SHOW_UBITS(re, &s->gb, 8) - 256;
344 SKIP_BITS(re, &s->gb, 8);
345 } else if (level == 0) {
346 level = SHOW_UBITS(re, &s->gb, 8);
347 SKIP_BITS(re, &s->gb, 8);
348 }
349 i += run;
350 check_scantable_index(s, i);
351 j = scantable[i];
352 if (level < 0) {
353 level = -level;
354 level = ((level * 2 + 1) * qscale) >> 1;
355 level = (level - 1) | 1;
356 level = -level;
357 } else {
358 level = ((level * 2 + 1) * qscale) >> 1;
359 level = (level - 1) | 1;
360 }
361 }
362
363 block[j] = level;
364 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
365 break;
366 UPDATE_CACHE(re, &s->gb);
367 }
368 end:
369 LAST_SKIP_BITS(re, &s->gb, 2);
370 CLOSE_READER(re, &s->gb);
371 }
372 s->block_last_index[n] = i;
373 return 0;
374 }
375
376 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
377 int16_t *block, int n)
378 {
379 int level, i, j, run;
380 RLTable *rl = &ff_rl_mpeg1;
381 uint8_t *const scantable = s->intra_scantable.permutated;
382 const uint16_t *quant_matrix;
383 const int qscale = s->qscale;
384 int mismatch;
385
386 mismatch = 1;
387
388 {
389 OPEN_READER(re, &s->gb);
390 i = -1;
391 if (n < 4)
392 quant_matrix = s->inter_matrix;
393 else
394 quant_matrix = s->chroma_inter_matrix;
395
396 // Special case for first coefficient, no need to add second VLC table.
397 UPDATE_CACHE(re, &s->gb);
398 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
399 level = (3 * qscale * quant_matrix[0]) >> 5;
400 if (GET_CACHE(re, &s->gb) & 0x40000000)
401 level = -level;
402 block[0] = level;
403 mismatch ^= level;
404 i++;
405 SKIP_BITS(re, &s->gb, 2);
406 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
407 goto end;
408 }
409
410 /* now quantify & encode AC coefficients */
411 for (;;) {
412 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
413 TEX_VLC_BITS, 2, 0);
414
415 if (level != 0) {
416 i += run;
417 check_scantable_index(s, i);
418 j = scantable[i];
419 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
420 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
421 SHOW_SBITS(re, &s->gb, 1);
422 SKIP_BITS(re, &s->gb, 1);
423 } else {
424 /* escape */
425 run = SHOW_UBITS(re, &s->gb, 6) + 1;
426 LAST_SKIP_BITS(re, &s->gb, 6);
427 UPDATE_CACHE(re, &s->gb);
428 level = SHOW_SBITS(re, &s->gb, 12);
429 SKIP_BITS(re, &s->gb, 12);
430
431 i += run;
432 check_scantable_index(s, i);
433 j = scantable[i];
434 if (level < 0) {
435 level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
436 level = -level;
437 } else {
438 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
439 }
440 }
441
442 mismatch ^= level;
443 block[j] = level;
444 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
445 break;
446 UPDATE_CACHE(re, &s->gb);
447 }
448 end:
449 LAST_SKIP_BITS(re, &s->gb, 2);
450 CLOSE_READER(re, &s->gb);
451 }
452 block[63] ^= (mismatch & 1);
453
454 s->block_last_index[n] = i;
455 return 0;
456 }
457
458 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
459 int16_t *block, int n)
460 {
461 int level, i, j, run;
462 RLTable *rl = &ff_rl_mpeg1;
463 uint8_t *const scantable = s->intra_scantable.permutated;
464 const int qscale = s->qscale;
465 OPEN_READER(re, &s->gb);
466 i = -1;
467
468 // special case for first coefficient, no need to add second VLC table
469 UPDATE_CACHE(re, &s->gb);
470 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
471 level = (3 * qscale) >> 1;
472 if (GET_CACHE(re, &s->gb) & 0x40000000)
473 level = -level;
474 block[0] = level;
475 i++;
476 SKIP_BITS(re, &s->gb, 2);
477 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
478 goto end;
479 }
480
481 /* now quantify & encode AC coefficients */
482 for (;;) {
483 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
484
485 if (level != 0) {
486 i += run;
487 check_scantable_index(s, i);
488 j = scantable[i];
489 level = ((level * 2 + 1) * qscale) >> 1;
490 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
491 SHOW_SBITS(re, &s->gb, 1);
492 SKIP_BITS(re, &s->gb, 1);
493 } else {
494 /* escape */
495 run = SHOW_UBITS(re, &s->gb, 6) + 1;
496 LAST_SKIP_BITS(re, &s->gb, 6);
497 UPDATE_CACHE(re, &s->gb);
498 level = SHOW_SBITS(re, &s->gb, 12);
499 SKIP_BITS(re, &s->gb, 12);
500
501 i += run;
502 check_scantable_index(s, i);
503 j = scantable[i];
504 if (level < 0) {
505 level = ((-level * 2 + 1) * qscale) >> 1;
506 level = -level;
507 } else {
508 level = ((level * 2 + 1) * qscale) >> 1;
509 }
510 }
511
512 block[j] = level;
513 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
514 break;
515 UPDATE_CACHE(re, &s->gb);
516 }
517 end:
518 LAST_SKIP_BITS(re, &s->gb, 2);
519 CLOSE_READER(re, &s->gb);
520 s->block_last_index[n] = i;
521 return 0;
522 }
523
524 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
525 int16_t *block, int n)
526 {
527 int level, dc, diff, i, j, run;
528 int component;
529 RLTable *rl;
530 uint8_t *const scantable = s->intra_scantable.permutated;
531 const uint16_t *quant_matrix;
532 const int qscale = s->qscale;
533 int mismatch;
534
535 /* DC coefficient */
536 if (n < 4) {
537 quant_matrix = s->intra_matrix;
538 component = 0;
539 } else {
540 quant_matrix = s->chroma_intra_matrix;
541 component = (n & 1) + 1;
542 }
543 diff = decode_dc(&s->gb, component);
544 if (diff >= 0xffff)
545 return -1;
546 dc = s->last_dc[component];
547 dc += diff;
548 s->last_dc[component] = dc;
549 block[0] = dc << (3 - s->intra_dc_precision);
550 av_dlog(s->avctx, "dc=%d\n", block[0]);
551 mismatch = block[0] ^ 1;
552 i = 0;
553 if (s->intra_vlc_format)
554 rl = &ff_rl_mpeg2;
555 else
556 rl = &ff_rl_mpeg1;
557
558 {
559 OPEN_READER(re, &s->gb);
560 /* now quantify & encode AC coefficients */
561 for (;;) {
562 UPDATE_CACHE(re, &s->gb);
563 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
564 TEX_VLC_BITS, 2, 0);
565
566 if (level == 127) {
567 break;
568 } else if (level != 0) {
569 i += run;
570 check_scantable_index(s, i);
571 j = scantable[i];
572 level = (level * qscale * quant_matrix[j]) >> 4;
573 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
574 SHOW_SBITS(re, &s->gb, 1);
575 LAST_SKIP_BITS(re, &s->gb, 1);
576 } else {
577 /* escape */
578 run = SHOW_UBITS(re, &s->gb, 6) + 1;
579 LAST_SKIP_BITS(re, &s->gb, 6);
580 UPDATE_CACHE(re, &s->gb);
581 level = SHOW_SBITS(re, &s->gb, 12);
582 SKIP_BITS(re, &s->gb, 12);
583 i += run;
584 check_scantable_index(s, i);
585 j = scantable[i];
586 if (level < 0) {
587 level = (-level * qscale * quant_matrix[j]) >> 4;
588 level = -level;
589 } else {
590 level = (level * qscale * quant_matrix[j]) >> 4;
591 }
592 }
593
594 mismatch ^= level;
595 block[j] = level;
596 }
597 CLOSE_READER(re, &s->gb);
598 }
599 block[63] ^= mismatch & 1;
600
601 s->block_last_index[n] = i;
602 return 0;
603 }
604
605 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
606 int16_t *block, int n)
607 {
608 int level, dc, diff, i, j, run;
609 int component;
610 RLTable *rl;
611 uint8_t *const scantable = s->intra_scantable.permutated;
612 const uint16_t *quant_matrix;
613 const int qscale = s->qscale;
614
615 /* DC coefficient */
616 if (n < 4) {
617 quant_matrix = s->intra_matrix;
618 component = 0;
619 } else {
620 quant_matrix = s->chroma_intra_matrix;
621 component = (n & 1) + 1;
622 }
623 diff = decode_dc(&s->gb, component);
624 if (diff >= 0xffff)
625 return -1;
626 dc = s->last_dc[component];
627 dc += diff;
628 s->last_dc[component] = dc;
629 block[0] = dc << (3 - s->intra_dc_precision);
630 i = 0;
631 if (s->intra_vlc_format)
632 rl = &ff_rl_mpeg2;
633 else
634 rl = &ff_rl_mpeg1;
635
636 {
637 OPEN_READER(re, &s->gb);
638 /* now quantify & encode AC coefficients */
639 for (;;) {
640 UPDATE_CACHE(re, &s->gb);
641 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
642 TEX_VLC_BITS, 2, 0);
643
644 if (level == 127) {
645 break;
646 } else if (level != 0) {
647 i += run;
648 check_scantable_index(s, i);
649 j = scantable[i];
650 level = (level * qscale * quant_matrix[j]) >> 4;
651 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
652 SHOW_SBITS(re, &s->gb, 1);
653 LAST_SKIP_BITS(re, &s->gb, 1);
654 } else {
655 /* escape */
656 run = SHOW_UBITS(re, &s->gb, 6) + 1;
657 LAST_SKIP_BITS(re, &s->gb, 6);
658 UPDATE_CACHE(re, &s->gb);
659 level = SHOW_SBITS(re, &s->gb, 12);
660 SKIP_BITS(re, &s->gb, 12);
661 i += run;
662 check_scantable_index(s, i);
663 j = scantable[i];
664 if (level < 0) {
665 level = (-level * qscale * quant_matrix[j]) >> 4;
666 level = -level;
667 } else {
668 level = (level * qscale * quant_matrix[j]) >> 4;
669 }
670 }
671
672 block[j] = level;
673 }
674 CLOSE_READER(re, &s->gb);
675 }
676
677 s->block_last_index[n] = i;
678 return 0;
679 }
680
681 /******************************************/
682 /* decoding */
683
684 static inline int get_dmv(MpegEncContext *s)
685 {
686 if (get_bits1(&s->gb))
687 return 1 - (get_bits1(&s->gb) << 1);
688 else
689 return 0;
690 }
691
692 static inline int get_qscale(MpegEncContext *s)
693 {
694 int qscale = get_bits(&s->gb, 5);
695 if (s->q_scale_type)
696 return non_linear_qscale[qscale];
697 else
698 return qscale << 1;
699 }
700
701 /* motion type (for MPEG-2) */
702 #define MT_FIELD 1
703 #define MT_FRAME 2
704 #define MT_16X8 2
705 #define MT_DMV 3
706
707 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
708 {
709 int i, j, k, cbp, val, mb_type, motion_type;
710 const int mb_block_count = 4 + (1 << s->chroma_format);
711
712 av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
713
714 assert(s->mb_skipped == 0);
715
716 if (s->mb_skip_run-- != 0) {
717 if (s->pict_type == AV_PICTURE_TYPE_P) {
718 s->mb_skipped = 1;
719 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
720 MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
721 } else {
722 int mb_type;
723
724 if (s->mb_x)
725 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
726 else
727 // FIXME not sure if this is allowed in MPEG at all
728 mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
729 if (IS_INTRA(mb_type))
730 return -1;
731 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
732 mb_type | MB_TYPE_SKIP;
733 // assert(s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1] & (MB_TYPE_16x16 | MB_TYPE_16x8));
734
735 if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
736 s->mb_skipped = 1;
737 }
738
739 return 0;
740 }
741
742 switch (s->pict_type) {
743 default:
744 case AV_PICTURE_TYPE_I:
745 if (get_bits1(&s->gb) == 0) {
746 if (get_bits1(&s->gb) == 0) {
747 av_log(s->avctx, AV_LOG_ERROR,
748 "invalid mb type in I Frame at %d %d\n",
749 s->mb_x, s->mb_y);
750 return -1;
751 }
752 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
753 } else {
754 mb_type = MB_TYPE_INTRA;
755 }
756 break;
757 case AV_PICTURE_TYPE_P:
758 mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
759 if (mb_type < 0) {
760 av_log(s->avctx, AV_LOG_ERROR,
761 "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
762 return -1;
763 }
764 mb_type = ptype2mb_type[mb_type];
765 break;
766 case AV_PICTURE_TYPE_B:
767 mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
768 if (mb_type < 0) {
769 av_log(s->avctx, AV_LOG_ERROR,
770 "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
771 return -1;
772 }
773 mb_type = btype2mb_type[mb_type];
774 break;
775 }
776 av_dlog(s->avctx, "mb_type=%x\n", mb_type);
777 // motion_type = 0; /* avoid warning */
778 if (IS_INTRA(mb_type)) {
779 s->dsp.clear_blocks(s->block[0]);
780
781 if (!s->chroma_y_shift)
782 s->dsp.clear_blocks(s->block[6]);
783
784 /* compute DCT type */
785 // FIXME: add an interlaced_dct coded var?
786 if (s->picture_structure == PICT_FRAME &&
787 !s->frame_pred_frame_dct)
788 s->interlaced_dct = get_bits1(&s->gb);
789
790 if (IS_QUANT(mb_type))
791 s->qscale = get_qscale(s);
792
793 if (s->concealment_motion_vectors) {
794 /* just parse them */
795 if (s->picture_structure != PICT_FRAME)
796 skip_bits1(&s->gb); /* field select */
797
798 s->mv[0][0][0] =
799 s->last_mv[0][0][0] =
800 s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
801 s->last_mv[0][0][0]);
802 s->mv[0][0][1] =
803 s->last_mv[0][0][1] =
804 s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
805 s->last_mv[0][0][1]);
806
807 skip_bits1(&s->gb); /* marker */
808 } else {
809 /* reset mv prediction */
810 memset(s->last_mv, 0, sizeof(s->last_mv));
811 }
812 s->mb_intra = 1;
813 #if FF_API_XVMC
814 FF_DISABLE_DEPRECATION_WARNINGS
815 // if 1, we memcpy blocks in xvmcvideo
816 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
817 ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
818 FF_ENABLE_DEPRECATION_WARNINGS
819 #endif /* FF_API_XVMC */
820
821 if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
822 if (s->flags2 & CODEC_FLAG2_FAST) {
823 for (i = 0; i < 6; i++)
824 mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
825 } else {
826 for (i = 0; i < mb_block_count; i++)
827 if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
828 return -1;
829 }
830 } else {
831 for (i = 0; i < 6; i++)
832 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
833 return -1;
834 }
835 } else {
836 if (mb_type & MB_TYPE_ZERO_MV) {
837 assert(mb_type & MB_TYPE_CBP);
838
839 s->mv_dir = MV_DIR_FORWARD;
840 if (s->picture_structure == PICT_FRAME) {
841 if (!s->frame_pred_frame_dct)
842 s->interlaced_dct = get_bits1(&s->gb);
843 s->mv_type = MV_TYPE_16X16;
844 } else {
845 s->mv_type = MV_TYPE_FIELD;
846 mb_type |= MB_TYPE_INTERLACED;
847 s->field_select[0][0] = s->picture_structure - 1;
848 }
849
850 if (IS_QUANT(mb_type))
851 s->qscale = get_qscale(s);
852
853 s->last_mv[0][0][0] = 0;
854 s->last_mv[0][0][1] = 0;
855 s->last_mv[0][1][0] = 0;
856 s->last_mv[0][1][1] = 0;
857 s->mv[0][0][0] = 0;
858 s->mv[0][0][1] = 0;
859 } else {
860 assert(mb_type & MB_TYPE_L0L1);
861 // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
862 /* get additional motion vector type */
863 if (s->frame_pred_frame_dct) {
864 motion_type = MT_FRAME;
865 } else {
866 motion_type = get_bits(&s->gb, 2);
867 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
868 s->interlaced_dct = get_bits1(&s->gb);
869 }
870
871 if (IS_QUANT(mb_type))
872 s->qscale = get_qscale(s);
873
874 /* motion vectors */
875 s->mv_dir = (mb_type >> 13) & 3;
876 av_dlog(s->avctx, "motion_type=%d\n", motion_type);
877 switch (motion_type) {
878 case MT_FRAME: /* or MT_16X8 */
879 if (s->picture_structure == PICT_FRAME) {
880 mb_type |= MB_TYPE_16x16;
881 s->mv_type = MV_TYPE_16X16;
882 for (i = 0; i < 2; i++) {
883 if (USES_LIST(mb_type, i)) {
884 /* MT_FRAME */
885 s->mv[i][0][0] =
886 s->last_mv[i][0][0] =
887 s->last_mv[i][1][0] =
888 mpeg_decode_motion(s, s->mpeg_f_code[i][0],
889 s->last_mv[i][0][0]);
890 s->mv[i][0][1] =
891 s->last_mv[i][0][1] =
892 s->last_mv[i][1][1] =
893 mpeg_decode_motion(s, s->mpeg_f_code[i][1],
894 s->last_mv[i][0][1]);
895 /* full_pel: only for MPEG-1 */
896 if (s->full_pel[i]) {
897 s->mv[i][0][0] <<= 1;
898 s->mv[i][0][1] <<= 1;
899 }
900 }
901 }
902 } else {
903 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
904 s->mv_type = MV_TYPE_16X8;
905 for (i = 0; i < 2; i++) {
906 if (USES_LIST(mb_type, i)) {
907 /* MT_16X8 */
908 for (j = 0; j < 2; j++) {
909 s->field_select[i][j] = get_bits1(&s->gb);
910 for (k = 0; k < 2; k++) {
911 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
912 s->last_mv[i][j][k]);
913 s->last_mv[i][j][k] = val;
914 s->mv[i][j][k] = val;
915 }
916 }
917 }
918 }
919 }
920 break;
921 case MT_FIELD:
922 s->mv_type = MV_TYPE_FIELD;
923 if (s->picture_structure == PICT_FRAME) {
924 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
925 for (i = 0; i < 2; i++) {
926 if (USES_LIST(mb_type, i)) {
927 for (j = 0; j < 2; j++) {
928 s->field_select[i][j] = get_bits1(&s->gb);
929 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
930 s->last_mv[i][j][0]);
931 s->last_mv[i][j][0] = val;
932 s->mv[i][j][0] = val;
933 av_dlog(s->avctx, "fmx=%d\n", val);
934 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
935 s->last_mv[i][j][1] >> 1);
936 s->last_mv[i][j][1] = val << 1;
937 s->mv[i][j][1] = val;
938 av_dlog(s->avctx, "fmy=%d\n", val);
939 }
940 }
941 }
942 } else {
943 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
944 for (i = 0; i < 2; i++) {
945 if (USES_LIST(mb_type, i)) {
946 s->field_select[i][0] = get_bits1(&s->gb);
947 for (k = 0; k < 2; k++) {
948 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
949 s->last_mv[i][0][k]);
950 s->last_mv[i][0][k] = val;
951 s->last_mv[i][1][k] = val;
952 s->mv[i][0][k] = val;
953 }
954 }
955 }
956 }
957 break;
958 case MT_DMV:
959 s->mv_type = MV_TYPE_DMV;
960 for (i = 0; i < 2; i++) {
961 if (USES_LIST(mb_type, i)) {
962 int dmx, dmy, mx, my, m;
963 const int my_shift = s->picture_structure == PICT_FRAME;
964
965 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
966 s->last_mv[i][0][0]);
967 s->last_mv[i][0][0] = mx;
968 s->last_mv[i][1][0] = mx;
969 dmx = get_dmv(s);
970 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
971 s->last_mv[i][0][1] >> my_shift);
972 dmy = get_dmv(s);
973
974
975 s->last_mv[i][0][1] = my << my_shift;
976 s->last_mv[i][1][1] = my << my_shift;
977
978 s->mv[i][0][0] = mx;
979 s->mv[i][0][1] = my;
980 s->mv[i][1][0] = mx; // not used
981 s->mv[i][1][1] = my; // not used
982
983 if (s->picture_structure == PICT_FRAME) {
984 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
985
986 // m = 1 + 2 * s->top_field_first;
987 m = s->top_field_first ? 1 : 3;
988
989 /* top -> top pred */
990 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
991 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
992 m = 4 - m;
993 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
994 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
995 } else {
996 mb_type |= MB_TYPE_16x16;
997
998 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
999 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1000 if (s->picture_structure == PICT_TOP_FIELD)
1001 s->mv[i][2][1]--;
1002 else
1003 s->mv[i][2][1]++;
1004 }
1005 }
1006 }
1007 break;
1008 default:
1009 av_log(s->avctx, AV_LOG_ERROR,
1010 "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1011 return -1;
1012 }
1013 }
1014
1015 s->mb_intra = 0;
1016 if (HAS_CBP(mb_type)) {
1017 s->dsp.clear_blocks(s->block[0]);
1018
1019 cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1020 if (mb_block_count > 6) {
1021 cbp <<= mb_block_count - 6;
1022 cbp |= get_bits(&s->gb, mb_block_count - 6);
1023 s->dsp.clear_blocks(s->block[6]);
1024 }
1025 if (cbp <= 0) {
1026 av_log(s->avctx, AV_LOG_ERROR,
1027 "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1028 return -1;
1029 }
1030
1031 #if FF_API_XVMC
1032 FF_DISABLE_DEPRECATION_WARNINGS
1033 // if 1, we memcpy blocks in xvmcvideo
1034 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1035 ff_xvmc_pack_pblocks(s, cbp);
1036 FF_ENABLE_DEPRECATION_WARNINGS
1037 #endif /* FF_API_XVMC */
1038
1039 if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1040 if (s->flags2 & CODEC_FLAG2_FAST) {
1041 for (i = 0; i < 6; i++) {
1042 if (cbp & 32)
1043 mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1044 else
1045 s->block_last_index[i] = -1;
1046 cbp += cbp;
1047 }
1048 } else {
1049 cbp <<= 12 - mb_block_count;
1050
1051 for (i = 0; i < mb_block_count; i++) {
1052 if (cbp & (1 << 11)) {
1053 if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
1054 return -1;
1055 } else {
1056 s->block_last_index[i] = -1;
1057 }
1058 cbp += cbp;
1059 }
1060 }
1061 } else {
1062 if (s->flags2 & CODEC_FLAG2_FAST) {
1063 for (i = 0; i < 6; i++) {
1064 if (cbp & 32)
1065 mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1066 else
1067 s->block_last_index[i] = -1;
1068 cbp += cbp;
1069 }
1070 } else {
1071 for (i = 0; i < 6; i++) {
1072 if (cbp & 32) {
1073 if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
1074 return -1;
1075 } else {
1076 s->block_last_index[i] = -1;
1077 }
1078 cbp += cbp;
1079 }
1080 }
1081 }
1082 } else {
1083 for (i = 0; i < 12; i++)
1084 s->block_last_index[i] = -1;
1085 }
1086 }
1087
1088 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1089
1090 return 0;
1091 }
1092
1093 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1094 {
1095 Mpeg1Context *s = avctx->priv_data;
1096 MpegEncContext *s2 = &s->mpeg_enc_ctx;
1097 int i;
1098
1099 /* we need some permutation to store matrices,
1100 * until MPV_common_init() sets the real permutation. */
1101 for (i = 0; i < 64; i++)
1102 s2->dsp.idct_permutation[i] = i;
1103
1104 ff_MPV_decode_defaults(s2);
1105
1106 s->mpeg_enc_ctx.avctx = avctx;
1107 s->mpeg_enc_ctx.flags = avctx->flags;
1108 s->mpeg_enc_ctx.flags2 = avctx->flags2;
1109 ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1110 ff_mpeg12_init_vlcs();
1111
1112 s->mpeg_enc_ctx_allocated = 0;
1113 s->mpeg_enc_ctx.picture_number = 0;
1114 s->repeat_field = 0;
1115 s->mpeg_enc_ctx.codec_id = avctx->codec->id;
1116 avctx->color_range = AVCOL_RANGE_MPEG;
1117 if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1118 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1119 else
1120 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1121 return 0;
1122 }
1123
1124 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1125 const AVCodecContext *avctx_from)
1126 {
1127 Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1128 MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1129 int err;
1130
1131 if (avctx == avctx_from ||
1132 !ctx_from->mpeg_enc_ctx_allocated ||
1133 !s1->context_initialized)
1134 return 0;
1135
1136 err = ff_mpeg_update_thread_context(avctx, avctx_from);
1137 if (err)
1138 return err;
1139
1140 if (!ctx->mpeg_enc_ctx_allocated)
1141 memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1142
1143 if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1144 s->picture_number++;
1145
1146 return 0;
1147 }
1148
1149 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1150 const uint8_t *new_perm)
1151 {
1152 uint16_t temp_matrix[64];
1153 int i;
1154
1155 memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1156
1157 for (i = 0; i < 64; i++)
1158 matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1159 }
1160
1161 #if FF_API_XVMC
1162 static const enum AVPixelFormat pixfmt_xvmc_mpg2_420[] = {
1163 AV_PIX_FMT_XVMC_MPEG2_IDCT,
1164 AV_PIX_FMT_XVMC_MPEG2_MC,
1165 AV_PIX_FMT_NONE
1166 };
1167 #endif /* FF_API_XVMC */
1168
1169 static const enum AVPixelFormat mpeg12_hwaccel_pixfmt_list_420[] = {
1170 #if CONFIG_MPEG2_DXVA2_HWACCEL
1171 AV_PIX_FMT_DXVA2_VLD,
1172 #endif
1173 #if CONFIG_MPEG2_VAAPI_HWACCEL
1174 AV_PIX_FMT_VAAPI_VLD,
1175 #endif
1176 #if CONFIG_MPEG1_VDPAU_HWACCEL | CONFIG_MPEG2_VDPAU_HWACCEL
1177 AV_PIX_FMT_VDPAU,
1178 #endif
1179 AV_PIX_FMT_YUV420P,
1180 AV_PIX_FMT_NONE
1181 };
1182
1183 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1184 {
1185 Mpeg1Context *s1 = avctx->priv_data;
1186 MpegEncContext *s = &s1->mpeg_enc_ctx;
1187
1188 #if FF_API_XVMC
1189 FF_DISABLE_DEPRECATION_WARNINGS
1190 if (avctx->xvmc_acceleration)
1191 return ff_get_format(avctx, pixfmt_xvmc_mpg2_420);
1192 FF_ENABLE_DEPRECATION_WARNINGS
1193 #endif /* FF_API_XVMC */
1194
1195 if (s->chroma_format < 2)
1196 return ff_get_format(avctx, mpeg12_hwaccel_pixfmt_list_420);
1197 else if (s->chroma_format == 2)
1198 return AV_PIX_FMT_YUV422P;
1199 else
1200 return AV_PIX_FMT_YUV444P;
1201 }
1202
1203 /* Call this function when we know all parameters.
1204 * It may be called in different places for MPEG-1 and MPEG-2. */
1205 static int mpeg_decode_postinit(AVCodecContext *avctx)
1206 {
1207 Mpeg1Context *s1 = avctx->priv_data;
1208 MpegEncContext *s = &s1->mpeg_enc_ctx;
1209 uint8_t old_permutation[64];
1210 int ret;
1211
1212 if ((s1->mpeg_enc_ctx_allocated == 0) ||
1213 avctx->coded_width != s->width ||
1214 avctx->coded_height != s->height ||
1215 s1->save_width != s->width ||
1216 s1->save_height != s->height ||
1217 s1->save_aspect_info != s->aspect_ratio_info ||
1218 s1->save_progressive_seq != s->progressive_sequence ||
1219 0) {
1220 if (s1->mpeg_enc_ctx_allocated) {
1221 ParseContext pc = s->parse_context;
1222 s->parse_context.buffer = 0;
1223 ff_MPV_common_end(s);
1224 s->parse_context = pc;
1225 }
1226
1227 if ((s->width == 0) || (s->height == 0))
1228 return -2;
1229
1230 ret = ff_set_dimensions(avctx, s->width, s->height);
1231 if (ret < 0)
1232 return ret;
1233
1234 avctx->bit_rate = s->bit_rate;
1235 s1->save_aspect_info = s->aspect_ratio_info;
1236 s1->save_width = s->width;
1237 s1->save_height = s->height;
1238 s1->save_progressive_seq = s->progressive_sequence;
1239
1240 /* low_delay may be forced, in this case we will have B-frames
1241 * that behave like P-frames. */
1242 avctx->has_b_frames = !s->low_delay;
1243
1244 if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1245 // MPEG-1 fps
1246 avctx->time_base.den = ff_mpeg12_frame_rate_tab[s->frame_rate_index].num;
1247 avctx->time_base.num = ff_mpeg12_frame_rate_tab[s->frame_rate_index].den;
1248 // MPEG-1 aspect
1249 avctx->sample_aspect_ratio = av_d2q(1.0 / ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1250 avctx->ticks_per_frame = 1;
1251 } else { // MPEG-2
1252 // MPEG-2 fps
1253 av_reduce(&s->avctx->time_base.den,
1254 &s->avctx->time_base.num,
1255 ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num * 2,
1256 ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1257 1 << 30);
1258 avctx->ticks_per_frame = 2;
1259 // MPEG-2 aspect
1260 if (s->aspect_ratio_info > 1) {
1261 AVRational dar =
1262 av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1263 (AVRational) { s1->pan_scan.width,
1264 s1->pan_scan.height }),
1265 (AVRational) { s->width, s->height });
1266
1267 /* We ignore the spec here and guess a bit as reality does not
1268 * match the spec, see for example res_change_ffmpeg_aspect.ts
1269 * and sequence-display-aspect.mpg.
1270 * issue1613, 621, 562 */
1271 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1272 (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1273 av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1274 s->avctx->sample_aspect_ratio =
1275 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1276 (AVRational) { s->width, s->height });
1277 } else {
1278 s->avctx->sample_aspect_ratio =
1279 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1280 (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1281 // issue1613 4/3 16/9 -> 16/9
1282 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1283 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1284 // s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1285 av_dlog(avctx, "A %d/%d\n",
1286 ff_mpeg2_aspect[s->aspect_ratio_info].num,
1287 ff_mpeg2_aspect[s->aspect_ratio_info].den);
1288 av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1289 s->avctx->sample_aspect_ratio.den);
1290 }
1291 } else {
1292 s->avctx->sample_aspect_ratio =
1293 ff_mpeg2_aspect[s->aspect_ratio_info];
1294 }
1295 } // MPEG-2
1296
1297 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1298 avctx->hwaccel = ff_find_hwaccel(avctx);
1299 // until then pix_fmt may be changed right after codec init
1300 #if FF_API_XVMC
1301 if ((avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT ||
1302 avctx->hwaccel) && avctx->idct_algo == FF_IDCT_AUTO)
1303 #else
1304 if (avctx->hwaccel && avctx->idct_algo == FF_IDCT_AUTO)
1305 #endif /* FF_API_XVMC */
1306 avctx->idct_algo = FF_IDCT_SIMPLE;
1307
1308 /* Quantization matrices may need reordering
1309 * if DCT permutation is changed. */
1310 memcpy(old_permutation, s->dsp.idct_permutation, 64 * sizeof(uint8_t));
1311
1312 if (ff_MPV_common_init(s) < 0)
1313 return -2;
1314
1315 quant_matrix_rebuild(s->intra_matrix, old_permutation, s->dsp.idct_permutation);
1316 quant_matrix_rebuild(s->inter_matrix, old_permutation, s->dsp.idct_permutation);
1317 quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->dsp.idct_permutation);
1318 quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->dsp.idct_permutation);
1319
1320 s1->mpeg_enc_ctx_allocated = 1;
1321 }
1322 return 0;
1323 }
1324
1325 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1326 int buf_size)
1327 {
1328 Mpeg1Context *s1 = avctx->priv_data;
1329 MpegEncContext *s = &s1->mpeg_enc_ctx;
1330 int ref, f_code, vbv_delay;
1331
1332 init_get_bits(&s->gb, buf, buf_size * 8);
1333
1334 ref = get_bits(&s->gb, 10); /* temporal ref */
1335 s->pict_type = get_bits(&s->gb, 3);
1336 if (s->pict_type == 0 || s->pict_type > 3)
1337 return -1;
1338
1339 vbv_delay = get_bits(&s->gb, 16);
1340 if (s->pict_type == AV_PICTURE_TYPE_P ||
1341 s->pict_type == AV_PICTURE_TYPE_B) {
1342 s->full_pel[0] = get_bits1(&s->gb);
1343 f_code = get_bits(&s->gb, 3);
1344 if (f_code == 0 && (avctx->err_recognition & AV_EF_BITSTREAM))
1345 return -1;
1346 s->mpeg_f_code[0][0] = f_code;
1347 s->mpeg_f_code[0][1] = f_code;
1348 }
1349 if (s->pict_type == AV_PICTURE_TYPE_B) {
1350 s->full_pel[1] = get_bits1(&s->gb);
1351 f_code = get_bits(&s->gb, 3);
1352 if (f_code == 0 && (avctx->err_recognition & AV_EF_BITSTREAM))
1353 return -1;
1354 s->mpeg_f_code[1][0] = f_code;
1355 s->mpeg_f_code[1][1] = f_code;
1356 }
1357 s->current_picture.f->pict_type = s->pict_type;
1358 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1359
1360 if (avctx->debug & FF_DEBUG_PICT_INFO)
1361 av_log(avctx, AV_LOG_DEBUG,
1362 "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1363
1364 s->y_dc_scale = 8;
1365 s->c_dc_scale = 8;
1366 return 0;
1367 }
1368
1369 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1370 {
1371 MpegEncContext *s = &s1->mpeg_enc_ctx;
1372 int horiz_size_ext, vert_size_ext;
1373 int bit_rate_ext;
1374
1375 skip_bits(&s->gb, 1); /* profile and level esc*/
1376 s->avctx->profile = get_bits(&s->gb, 3);
1377 s->avctx->level = get_bits(&s->gb, 4);
1378 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1379 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1380 horiz_size_ext = get_bits(&s->gb, 2);
1381 vert_size_ext = get_bits(&s->gb, 2);
1382 s->width |= (horiz_size_ext << 12);
1383 s->height |= (vert_size_ext << 12);
1384 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1385 s->bit_rate += (bit_rate_ext << 18) * 400;
1386 skip_bits1(&s->gb); /* marker */
1387 s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1388
1389 s->low_delay = get_bits1(&s->gb);
1390 if (s->flags & CODEC_FLAG_LOW_DELAY)
1391 s->low_delay = 1;
1392
1393 s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1394 s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1395
1396 av_dlog(s->avctx, "sequence extension\n");
1397 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1398
1399 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1400 av_log(s->avctx, AV_LOG_DEBUG,
1401 "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1402 s->avctx->profile, s->avctx->level,
1403 s->avctx->rc_buffer_size, s->bit_rate);
1404 }
1405
1406 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1407 {
1408 MpegEncContext *s = &s1->mpeg_enc_ctx;
1409 int color_description, w, h;
1410
1411 skip_bits(&s->gb, 3); /* video format */
1412 color_description = get_bits1(&s->gb);
1413 if (color_description) {
1414 s->avctx->color_primaries = get_bits(&s->gb, 8);
1415 s->avctx->color_trc = get_bits(&s->gb, 8);
1416 s->avctx->colorspace = get_bits(&s->gb, 8);
1417 }
1418 w = get_bits(&s->gb, 14);
1419 skip_bits(&s->gb, 1); // marker
1420 h = get_bits(&s->gb, 14);
1421 // remaining 3 bits are zero padding
1422
1423 s1->pan_scan.width = 16 * w;
1424 s1->pan_scan.height = 16 * h;
1425
1426 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1427 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1428 }
1429
1430 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1431 {
1432 MpegEncContext *s = &s1->mpeg_enc_ctx;
1433 int i, nofco;
1434
1435 nofco = 1;
1436 if (s->progressive_sequence) {
1437 if (s->repeat_first_field) {
1438 nofco++;
1439 if (s->top_field_first)
1440 nofco++;
1441 }
1442 } else {
1443 if (s->picture_structure == PICT_FRAME) {
1444 nofco++;
1445 if (s->repeat_first_field)
1446 nofco++;
1447 }
1448 }
1449 for (i = 0; i < nofco; i++) {
1450 s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1451 skip_bits(&s->gb, 1); // marker
1452 s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1453 skip_bits(&s->gb, 1); // marker
1454 }
1455
1456 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1457 av_log(s->avctx, AV_LOG_DEBUG,
1458 "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1459 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1460 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1461 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1462 }
1463
1464 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1465 uint16_t matrix1[64], int intra)
1466 {
1467 int i;
1468
1469 for (i = 0; i < 64; i++) {
1470 int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1471 int v = get_bits(&s->gb, 8);
1472 if (v == 0) {
1473 av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1474 return -1;
1475 }
1476 if (intra && i == 0 && v != 8) {
1477 av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
1478 v = 8; // needed by pink.mpg / issue1046
1479 }
1480 matrix0[j] = v;
1481 if (matrix1)
1482 matrix1[j] = v;
1483 }
1484 return 0;
1485 }
1486
1487 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1488 {
1489 av_dlog(s->avctx, "matrix extension\n");
1490
1491 if (get_bits1(&s->gb))
1492 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1493 if (get_bits1(&s->gb))
1494 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1495 if (get_bits1(&s->gb))
1496 load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1497 if (get_bits1(&s->gb))
1498 load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1499 }
1500
1501 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1502 {
1503 MpegEncContext *s = &s1->mpeg_enc_ctx;
1504
1505 s->full_pel[0] = s->full_pel[1] = 0;
1506 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1507 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1508 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1509 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1510 if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1511 av_log(s->avctx, AV_LOG_ERROR,
1512 "Missing picture start code, guessing missing values\n");
1513 if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1514 if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1515 s->pict_type = AV_PICTURE_TYPE_I;
1516 else
1517 s->pict_type = AV_PICTURE_TYPE_P;
1518 } else
1519 s->pict_type = AV_PICTURE_TYPE_B;
1520 s->current_picture.f->pict_type = s->pict_type;
1521 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1522 }
1523 s->intra_dc_precision = get_bits(&s->gb, 2);
1524 s->picture_structure = get_bits(&s->gb, 2);
1525 s->top_field_first = get_bits1(&s->gb);
1526 s->frame_pred_frame_dct = get_bits1(&s->gb);
1527 s->concealment_motion_vectors = get_bits1(&s->gb);
1528 s->q_scale_type = get_bits1(&s->gb);
1529 s->intra_vlc_format = get_bits1(&s->gb);
1530 s->alternate_scan = get_bits1(&s->gb);
1531 s->repeat_first_field = get_bits1(&s->gb);
1532 s->chroma_420_type = get_bits1(&s->gb);
1533 s->progressive_frame = get_bits1(&s->gb);
1534
1535 if (s->progressive_sequence && !s->progressive_frame) {
1536 s->progressive_frame = 1;
1537 av_log(s->avctx, AV_LOG_ERROR,
1538 "interlaced frame in progressive sequence, ignoring\n");
1539 }
1540
1541 if (s->picture_structure == 0 ||
1542 (s->progressive_frame && s->picture_structure != PICT_FRAME)) {
1543 av_log(s->avctx, AV_LOG_ERROR,
1544 "picture_structure %d invalid, ignoring\n",
1545 s->picture_structure);
1546 s->picture_structure = PICT_FRAME;
1547 }
1548
1549 if (s->progressive_sequence && !s->frame_pred_frame_dct)
1550 av_log(s->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
1551
1552 if (s->picture_structure == PICT_FRAME) {
1553 s->first_field = 0;
1554 s->v_edge_pos = 16 * s->mb_height;
1555 } else {
1556 s->first_field ^= 1;
1557 s->v_edge_pos = 8 * s->mb_height;
1558 memset(s->mbskip_table, 0, s->mb_stride * s->mb_height);
1559 }
1560
1561 if (s->alternate_scan) {
1562 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1563 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1564 } else {
1565 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1566 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1567 }
1568
1569 /* composite display not parsed */
1570 av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1571 av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1572 av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1573 av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1574 av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1575 av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1576 av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1577 av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1578 av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1579 }
1580
1581 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1582 {
1583 AVCodecContext *avctx = s->avctx;
1584 Mpeg1Context *s1 = (Mpeg1Context *) s;
1585
1586 /* start frame decoding */
1587 if (s->first_field || s->picture_structure == PICT_FRAME) {
1588 AVFrameSideData *pan_scan;
1589
1590 if (ff_MPV_frame_start(s, avctx) < 0)
1591 return -1;
1592
1593 ff_mpeg_er_frame_start(s);
1594
1595 /* first check if we must repeat the frame */
1596 s->current_picture_ptr->f->repeat_pict = 0;
1597 if (s->repeat_first_field) {
1598 if (s->progressive_sequence) {
1599 if (s->top_field_first)
1600 s->current_picture_ptr->f->repeat_pict = 4;
1601 else
1602 s->current_picture_ptr->f->repeat_pict = 2;
1603 } else if (s->progressive_frame) {
1604 s->current_picture_ptr->f->repeat_pict = 1;
1605 }
1606 }
1607
1608 pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1609 AV_FRAME_DATA_PANSCAN,
1610 sizeof(s1->pan_scan));
1611 if (!pan_scan)
1612 return AVERROR(ENOMEM);
1613 memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1614
1615 if (s1->a53_caption) {
1616 AVFrameSideData *sd = av_frame_new_side_data(
1617 s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1618 s1->a53_caption_size);
1619 if (sd)
1620 memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1621 av_freep(&s1->a53_caption);
1622 }
1623
1624 if (s1->has_stereo3d) {
1625 AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1626 if (!stereo)
1627 return AVERROR(ENOMEM);
1628
1629 *stereo = s1->stereo3d;
1630 s1->has_stereo3d = 0;
1631 }
1632 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1633 ff_thread_finish_setup(avctx);
1634 } else { // second field
1635 int i;
1636
1637 if (!s->current_picture_ptr) {
1638 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1639 return -1;
1640 }
1641
1642 if (s->avctx->hwaccel &&
1643 (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1644 if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1645 av_log(avctx, AV_LOG_ERROR,
1646 "hardware accelerator failed to decode first field\n");
1647 }
1648
1649 for (i = 0; i < 4; i++) {
1650 s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1651 if (s->picture_structure == PICT_BOTTOM_FIELD)
1652 s->current_picture.f->data[i] +=
1653 s->current_picture_ptr->f->linesize[i];
1654 }
1655 }
1656
1657 if (avctx->hwaccel) {
1658 if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1659 return -1;
1660 }
1661
1662 #if FF_API_XVMC
1663 FF_DISABLE_DEPRECATION_WARNINGS
1664 // MPV_frame_start will call this function too,
1665 // but we need to call it on every field
1666 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1667 if (ff_xvmc_field_start(s, avctx) < 0)
1668 return -1;
1669 FF_ENABLE_DEPRECATION_WARNINGS
1670 #endif /* FF_API_XVMC */
1671
1672 return 0;
1673 }
1674
1675 #define DECODE_SLICE_ERROR -1
1676 #define DECODE_SLICE_OK 0
1677
1678 /**
1679 * Decode a slice.
1680 * MpegEncContext.mb_y must be set to the MB row from the startcode.
1681 * @return DECODE_SLICE_ERROR if the slice is damaged,
1682 * DECODE_SLICE_OK if this slice is OK
1683 */
1684 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1685 const uint8_t **buf, int buf_size)
1686 {
1687 AVCodecContext *avctx = s->avctx;
1688 const int field_pic = s->picture_structure != PICT_FRAME;
1689
1690 s->resync_mb_x =
1691 s->resync_mb_y = -1;
1692
1693 assert(mb_y < s->mb_height);
1694
1695 init_get_bits(&s->gb, *buf, buf_size * 8);
1696
1697 ff_mpeg1_clean_buffers(s);
1698 s->interlaced_dct = 0;
1699
1700 s->qscale = get_qscale(s);
1701
1702 if (s->qscale == 0) {
1703 av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1704 return -1;
1705 }
1706
1707 /* extra slice info */
1708 while (get_bits1(&s->gb) != 0)
1709 skip_bits(&s->gb, 8);
1710
1711 s->mb_x = 0;
1712
1713 if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1714 skip_bits1(&s->gb);
1715 } else {
1716 while (get_bits_left(&s->gb) > 0) {
1717 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1718 MBINCR_VLC_BITS, 2);
1719 if (code < 0) {
1720 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1721 return -1;
1722 }
1723 if (code >= 33) {
1724 if (code == 33)
1725 s->mb_x += 33;
1726 /* otherwise, stuffing, nothing to do */
1727 } else {
1728 s->mb_x += code;
1729 break;
1730 }
1731 }
1732 }
1733
1734 if (s->mb_x >= (unsigned) s->mb_width) {
1735 av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1736 return -1;
1737 }
1738
1739 if (avctx->hwaccel) {
1740 const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1741 int start_code = -1;
1742 buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1743 if (buf_end < *buf + buf_size)
1744 buf_end -= 4;
1745 s->mb_y = mb_y;
1746 if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1747 return DECODE_SLICE_ERROR;
1748 *buf = buf_end;
1749 return DECODE_SLICE_OK;
1750 }
1751
1752 s->resync_mb_x = s->mb_x;
1753 s->resync_mb_y = s->mb_y = mb_y;
1754 s->mb_skip_run = 0;
1755 ff_init_block_index(s);
1756
1757 if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1758 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1759 av_log(s->avctx, AV_LOG_DEBUG,
1760 "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",
1761 s->qscale,
1762 s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1763 s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1764 s->pict_type == AV_PICTURE_TYPE_I ? "I" :
1765 (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1766 (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1767 s->progressive_sequence ? "ps" : "",
1768 s->progressive_frame ? "pf" : "",
1769 s->alternate_scan ? "alt" : "",
1770 s->top_field_first ? "top" : "",
1771 s->intra_dc_precision, s->picture_structure,
1772 s->frame_pred_frame_dct, s->concealment_motion_vectors,
1773 s->q_scale_type, s->intra_vlc_format,
1774 s->repeat_first_field, s->chroma_420_type ? "420" : "");
1775 }
1776 }
1777
1778 for (;;) {
1779 #if FF_API_XVMC
1780 FF_DISABLE_DEPRECATION_WARNINGS
1781 // If 1, we memcpy blocks in xvmcvideo.
1782 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1783 ff_xvmc_init_block(s); // set s->block
1784 FF_ENABLE_DEPRECATION_WARNINGS
1785 #endif /* FF_API_XVMC */
1786
1787 if (mpeg_decode_mb(s, s->block) < 0)
1788 return -1;
1789
1790 // Note motion_val is normally NULL unless we want to extract the MVs.
1791 if (s->current_picture.motion_val[0] && !s->encoding) {
1792 const int wrap = s->b8_stride;
1793 int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1794 int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1795 int motion_x, motion_y, dir, i;
1796
1797 for (i = 0; i < 2; i++) {
1798 for (dir = 0; dir < 2; dir++) {
1799 if (s->mb_intra ||
1800 (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1801 motion_x = motion_y = 0;
1802 } else if (s->mv_type == MV_TYPE_16X16 ||
1803 (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1804 motion_x = s->mv[dir][0][0];
1805 motion_y = s->mv[dir][0][1];
1806 } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1807 motion_x = s->mv[dir][i][0];
1808 motion_y = s->mv[dir][i][1];
1809 }
1810
1811 s->current_picture.motion_val[dir][xy][0] = motion_x;
1812 s->current_picture.motion_val[dir][xy][1] = motion_y;
1813 s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1814 s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1815 s->current_picture.ref_index [dir][b8_xy] =
1816 s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1817 assert(s->field_select[dir][i] == 0 ||
1818 s->field_select[dir][i] == 1);
1819 }
1820 xy += wrap;
1821 b8_xy += 2;
1822 }
1823 }
1824
1825 s->dest[0] += 16;
1826 s->dest[1] += 16 >> s->chroma_x_shift;
1827 s->dest[2] += 16 >> s->chroma_x_shift;
1828
1829 ff_MPV_decode_mb(s, s->block);
1830
1831 if (++s->mb_x >= s->mb_width) {
1832 const int mb_size = 16;
1833
1834 ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1835 ff_MPV_report_decode_progress(s);
1836
1837 s->mb_x = 0;
1838 s->mb_y += 1 << field_pic;
1839
1840 if (s->mb_y >= s->mb_height) {
1841 int left = get_bits_left(&s->gb);
1842 int is_d10 = s->chroma_format == 2 &&
1843 s->pict_type == AV_PICTURE_TYPE_I &&
1844 avctx->profile == 0 && avctx->level == 5 &&
1845 s->intra_dc_precision == 2 &&
1846 s->q_scale_type == 1 && s->alternate_scan == 0 &&
1847 s->progressive_frame == 0
1848 /* vbv_delay == 0xBBB || 0xE10 */;
1849
1850 if (left < 0 ||
1851 (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1852 ((avctx->err_recognition & AV_EF_BUFFER) && left > 8)) {
1853 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
1854 left, show_bits(&s->gb, FFMIN(left, 23)));
1855 return -1;
1856 } else
1857 goto eos;
1858 }
1859
1860 ff_init_block_index(s);
1861 }
1862
1863 /* skip mb handling */
1864 if (s->mb_skip_run == -1) {
1865 /* read increment again */
1866 s->mb_skip_run = 0;
1867 for (;;) {
1868 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1869 MBINCR_VLC_BITS, 2);
1870 if (code < 0) {
1871 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1872 return -1;
1873 }
1874 if (code >= 33) {
1875 if (code == 33) {
1876 s->mb_skip_run += 33;
1877 } else if (code == 35) {
1878 if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1879 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1880 return -1;
1881 }
1882 goto eos; /* end of slice */
1883 }
1884 /* otherwise, stuffing, nothing to do */
1885 } else {
1886 s->mb_skip_run += code;
1887 break;
1888 }
1889 }
1890 if (s->mb_skip_run) {
1891 int i;
1892 if (s->pict_type == AV_PICTURE_TYPE_I) {
1893 av_log(s->avctx, AV_LOG_ERROR,
1894 "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1895 return -1;
1896 }
1897
1898 /* skip mb */
1899 s->mb_intra = 0;
1900 for (i = 0; i < 12; i++)
1901 s->block_last_index[i] = -1;
1902 if (s->picture_structure == PICT_FRAME)
1903 s->mv_type = MV_TYPE_16X16;
1904 else
1905 s->mv_type = MV_TYPE_FIELD;
1906 if (s->pict_type == AV_PICTURE_TYPE_P) {
1907 /* if P type, zero motion vector is implied */
1908 s->mv_dir = MV_DIR_FORWARD;
1909 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1910 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1911 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1912 s->field_select[0][0] = (s->picture_structure - 1) & 1;
1913 } else {
1914 /* if B type, reuse previous vectors and directions */
1915 s->mv[0][0][0] = s->last_mv[0][0][0];
1916 s->mv[0][0][1] = s->last_mv[0][0][1];
1917 s->mv[1][0][0] = s->last_mv[1][0][0];
1918 s->mv[1][0][1] = s->last_mv[1][0][1];
1919 }
1920 }
1921 }
1922 }
1923 eos: // end of slice
1924 *buf += (get_bits_count(&s->gb) - 1) / 8;
1925 av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1926 return 0;
1927 }
1928
1929 static int slice_decode_thread(AVCodecContext *c, void *arg)
1930 {
1931 MpegEncContext *s = *(void **) arg;
1932 const uint8_t *buf = s->gb.buffer;
1933 int mb_y = s->start_mb_y;
1934 const int field_pic = s->picture_structure != PICT_FRAME;
1935
1936 s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1937
1938 for (;;) {
1939 uint32_t start_code;
1940 int ret;
1941
1942 ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1943 emms_c();
1944 av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1945 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1946 s->start_mb_y, s->end_mb_y, s->er.error_count);
1947 if (ret < 0) {
1948 if (c->err_recognition & AV_EF_EXPLODE)
1949 return ret;
1950 if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1951 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1952 s->mb_x, s->mb_y,
1953 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
1954 } else {
1955 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1956 s->mb_x - 1, s->mb_y,
1957 ER_AC_END | ER_DC_END | ER_MV_END);
1958 }
1959
1960 if (s->mb_y == s->end_mb_y)
1961 return 0;
1962
1963 start_code = -1;
1964 buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
1965 mb_y = (start_code - SLICE_MIN_START_CODE) << field_pic;
1966 if (s->picture_structure == PICT_BOTTOM_FIELD)
1967 mb_y++;
1968 if (mb_y < 0 || mb_y >= s->end_mb_y)
1969 return -1;
1970 }
1971 }
1972
1973 /**
1974 * Handle slice ends.
1975 * @return 1 if it seems to be the last slice
1976 */
1977 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1978 {
1979 Mpeg1Context *s1 = avctx->priv_data;
1980 MpegEncContext *s = &s1->mpeg_enc_ctx;
1981
1982 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1983 return 0;
1984
1985 if (s->avctx->hwaccel) {
1986 if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1987 av_log(avctx, AV_LOG_ERROR,
1988 "hardware accelerator failed to decode picture\n");
1989 }
1990
1991 #if FF_API_XVMC
1992 FF_DISABLE_DEPRECATION_WARNINGS
1993 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1994 ff_xvmc_field_end(s);
1995 FF_ENABLE_DEPRECATION_WARNINGS
1996 #endif /* FF_API_XVMC */
1997
1998 /* end of slice reached */
1999 if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field) {
2000 /* end of image */
2001
2002 ff_er_frame_end(&s->er);
2003
2004 ff_MPV_frame_end(s);
2005
2006 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2007 int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2008 if (ret < 0)
2009 return ret;
2010 ff_print_debug_info(s, s->current_picture_ptr);
2011 } else {
2012 if (avctx->active_thread_type & FF_THREAD_FRAME)
2013 s->picture_number++;
2014 /* latency of 1 frame for I- and P-frames */
2015 /* XXX: use another variable than picture_number */
2016 if (s->last_picture_ptr != NULL) {
2017 int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2018 if (ret < 0)
2019 return ret;
2020 ff_print_debug_info(s, s->last_picture_ptr);
2021 }
2022 }
2023
2024 return 1;
2025 } else {
2026 return 0;
2027 }
2028 }
2029
2030 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2031 const uint8_t *buf, int buf_size)
2032 {
2033 Mpeg1Context *s1 = avctx->priv_data;
2034 MpegEncContext *s = &s1->mpeg_enc_ctx;
2035 int width, height;
2036 int i, v, j;
2037
2038 init_get_bits(&s->gb, buf, buf_size * 8);
2039
2040 width = get_bits(&s->gb, 12);
2041 height = get_bits(&s->gb, 12);
2042 if (width == 0 || height == 0) {
2043 av_log(avctx, AV_LOG_WARNING,
2044 "Invalid horizontal or vertical size value.\n");
2045 if (avctx->err_recognition & AV_EF_BITSTREAM)
2046 return AVERROR_INVALIDDATA;
2047 }
2048 s->aspect_ratio_info = get_bits(&s->gb, 4);
2049 if (s->aspect_ratio_info == 0) {
2050 av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2051 if (avctx->err_recognition & AV_EF_BITSTREAM)
2052 return -1;
2053 }
2054 s->frame_rate_index = get_bits(&s->gb, 4);
2055 if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2056 return -1;
2057 s->bit_rate = get_bits(&s->gb, 18) * 400;
2058 if (get_bits1(&s->gb) == 0) /* marker */
2059 return -1;
2060 s->width = width;
2061 s->height = height;
2062
2063 s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2064 skip_bits(&s->gb, 1);
2065
2066 /* get matrix */
2067 if (get_bits1(&s->gb)) {
2068 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2069 } else {
2070 for (i = 0; i < 64; i++) {
2071 j = s->dsp.idct_permutation[i];
2072 v = ff_mpeg1_default_intra_matrix[i];
2073 s->intra_matrix[j] = v;
2074 s->chroma_intra_matrix[j] = v;
2075 }
2076 }
2077 if (get_bits1(&s->gb)) {
2078 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2079 } else {
2080 for (i = 0; i < 64; i++) {
2081 int j = s->dsp.idct_permutation[i];
2082 v = ff_mpeg1_default_non_intra_matrix[i];
2083 s->inter_matrix[j] = v;
2084 s->chroma_inter_matrix[j] = v;
2085 }
2086 }
2087
2088 if (show_bits(&s->gb, 23) != 0) {
2089 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2090 return -1;
2091 }
2092
2093 /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2094 s->progressive_sequence = 1;
2095 s->progressive_frame = 1;
2096 s->picture_structure = PICT_FRAME;
2097 s->frame_pred_frame_dct = 1;
2098 s->chroma_format = 1;
2099 s->codec_id =
2100 s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2101 s->out_format = FMT_MPEG1;
2102 if (s->flags & CODEC_FLAG_LOW_DELAY)
2103 s->low_delay = 1;
2104
2105 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2106 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2107 s->avctx->rc_buffer_size, s->bit_rate);
2108
2109 return 0;
2110 }
2111
2112 static int vcr2_init_sequence(AVCodecContext *avctx)
2113 {
2114 Mpeg1Context *s1 = avctx->priv_data;
2115 MpegEncContext *s = &s1->mpeg_enc_ctx;
2116 int i, v;
2117
2118 /* start new MPEG-1 context decoding */
2119 s->out_format = FMT_MPEG1;
2120 if (s1->mpeg_enc_ctx_allocated) {
2121 ff_MPV_common_end(s);
2122 }
2123 s->width = avctx->coded_width;
2124 s->height = avctx->coded_height;
2125 avctx->has_b_frames = 0; // true?
2126 s->low_delay = 1;
2127
2128 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2129 avctx->hwaccel = ff_find_hwaccel(avctx);
2130
2131 #if FF_API_XVMC
2132 if ((avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel) &&
2133 avctx->idct_algo == FF_IDCT_AUTO)
2134 #else
2135 if (avctx->hwaccel && avctx->idct_algo == FF_IDCT_AUTO)
2136 #endif /* FF_API_XVMC */
2137 avctx->idct_algo = FF_IDCT_SIMPLE;
2138
2139 if (ff_MPV_common_init(s) < 0)
2140 return -1;
2141 s1->mpeg_enc_ctx_allocated = 1;
2142
2143 for (i = 0; i < 64; i++) {
2144 int j = s->dsp.idct_permutation[i];
2145 v = ff_mpeg1_default_intra_matrix[i];
2146 s->intra_matrix[j] = v;
2147 s->chroma_intra_matrix[j] = v;
2148
2149 v = ff_mpeg1_default_non_intra_matrix[i];
2150 s->inter_matrix[j] = v;
2151 s->chroma_inter_matrix[j] = v;
2152 }
2153
2154 s->progressive_sequence = 1;
2155 s->progressive_frame = 1;
2156 s->picture_structure = PICT_FRAME;
2157 s->frame_pred_frame_dct = 1;
2158 s->chroma_format = 1;
2159 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2160 s1->save_width = s->width;
2161 s1->save_height = s->height;
2162 s1->save_progressive_seq = s->progressive_sequence;
2163 return 0;
2164 }
2165
2166 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2167 const uint8_t *p, int buf_size)
2168 {
2169 Mpeg1Context *s1 = avctx->priv_data;
2170
2171 if (buf_size >= 6 &&
2172 p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2173 p[4] == 3 && (p[5] & 0x40)) {
2174 /* extract A53 Part 4 CC data */
2175 int cc_count = p[5] & 0x1f;
2176 if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2177 av_freep(&s1->a53_caption);
2178 s1->a53_caption_size = cc_count * 3;
2179 s1->a53_caption = av_malloc(s1->a53_caption_size);
2180 if (s1->a53_caption)
2181 memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2182 }
2183 return 1;
2184 } else if (buf_size >= 11 &&
2185 p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2186 /* extract DVD CC data */
2187 int cc_count = 0;
2188 int i;
2189 // There is a caption count field in the data, but it is often
2190 // incorect. So count the number of captions present.
2191 for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2192 cc_count++;
2193 // Transform the DVD format into A53 Part 4 format
2194 if (cc_count > 0) {
2195 av_freep(&s1->a53_caption);
2196 s1->a53_caption_size = cc_count * 6;
2197 s1->a53_caption = av_malloc(s1->a53_caption_size);
2198 if (s1->a53_caption) {
2199 uint8_t field1 = !!(p[4] & 0x80);
2200 uint8_t *cap = s1->a53_caption;
2201 p += 5;
2202 for (i = 0; i < cc_count; i++) {
2203 cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2204 cap[1] = p[1];
2205 cap[2] = p[2];
2206 cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2207 cap[4] = p[4];
2208 cap[5] = p[5];
2209 cap += 6;
2210 p += 6;
2211 }
2212 }
2213 }
2214 return 1;
2215 }
2216 return 0;
2217 }
2218
2219 static void mpeg_decode_user_data(AVCodecContext *avctx,
2220 const uint8_t *p, int buf_size)
2221 {
2222 const uint8_t *buf_end = p + buf_size;
2223
2224 /* we parse the DTG active format information */
2225 if (buf_end - p >= 5 &&
2226 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2227 int flags = p[4];
2228 p += 5;
2229 if (flags & 0x80) {
2230 /* skip event id */
2231 p += 2;
2232 }
2233 if (flags & 0x40) {
2234 if (buf_end - p < 1)
2235 return;
2236 avctx->dtg_active_format = p[0] & 0x0f;
2237 }
2238 } else if (buf_end - p >= 6 &&
2239 p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2240 p[4] == 0x03) { // S3D_video_format_length
2241 // the 0x7F mask ignores the reserved_bit value
2242 const uint8_t S3D_video_format_type = p[5] & 0x7F;
2243
2244 if (S3D_video_format_type == 0x03 ||
2245 S3D_video_format_type == 0x04 ||
2246 S3D_video_format_type == 0x08 ||
2247 S3D_video_format_type == 0x23) {
2248 Mpeg1Context *s1 = avctx->priv_data;
2249
2250 s1->has_stereo3d = 1;
2251
2252 switch (S3D_video_format_type) {
2253 case 0x03:
2254 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2255 break;
2256 case 0x04:
2257 s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2258 break;
2259 case 0x08:
2260 s1->stereo3d.type = AV_STEREO3D_2D;
2261 break;
2262 case 0x23:
2263 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2264 break;
2265 }
2266 }
2267 } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2268 return;
2269 }
2270 }
2271
2272 static void mpeg_decode_gop(AVCodecContext *avctx,
2273 const uint8_t *buf, int buf_size)
2274 {
2275 Mpeg1Context *s1 = avctx->priv_data;
2276 MpegEncContext *s = &s1->mpeg_enc_ctx;
2277
2278 int time_code_hours, time_code_minutes;
2279 int time_code_seconds, time_code_pictures;
2280 int broken_link;
2281
2282 init_get_bits(&s->gb, buf, buf_size * 8);
2283
2284 skip_bits1(&s->gb); /* drop_frame_flag */
2285
2286 time_code_hours = get_bits(&s->gb, 5);
2287 time_code_minutes = get_bits(&s->gb, 6);
2288 skip_bits1(&s->gb); // marker bit
2289 time_code_seconds = get_bits(&s->gb, 6);
2290 time_code_pictures = get_bits(&s->gb, 6);
2291
2292 s1->closed_gop = get_bits1(&s->gb);
2293 /* broken_link indicate that after editing the
2294 * reference frames of the first B-Frames after GOP I-Frame
2295 * are missing (open gop) */
2296 broken_link = get_bits1(&s->gb);
2297
2298 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2299 av_log(s->avctx, AV_LOG_DEBUG,
2300 "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2301 time_code_hours, time_code_minutes, time_code_seconds,
2302 time_code_pictures, s1->closed_gop, broken_link);
2303 }
2304
2305 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2306 int *got_output, const uint8_t *buf, int buf_size)
2307 {
2308 Mpeg1Context *s = avctx->priv_data;
2309 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2310 const uint8_t *buf_ptr = buf;
2311 const uint8_t *buf_end = buf + buf_size;
2312 int ret, input_size;
2313 int last_code = 0, skip_frame = 0;
2314
2315 for (;;) {
2316 /* find next start code */
2317 uint32_t start_code = -1;
2318 buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2319 if (start_code > 0x1ff) {
2320 if (!skip_frame) {
2321 if (HAVE_THREADS &&
2322 (avctx->active_thread_type & FF_THREAD_SLICE) &&
2323 !avctx->hwaccel) {
2324 int i;
2325
2326 avctx->execute(avctx, slice_decode_thread,
2327 &s2->thread_context[0], NULL,
2328 s->slice_count, sizeof(void *));
2329 for (i = 0; i < s->slice_count; i++)
2330 s2->er.error_count += s2->thread_context[i]->er.error_count;
2331 }
2332
2333 ret = slice_end(avctx, picture);
2334 if (ret < 0)
2335 return ret;
2336 else if (ret) {
2337 // FIXME: merge with the stuff in mpeg_decode_slice
2338 if (s2->last_picture_ptr || s2->low_delay)
2339 *got_output = 1;
2340 }
2341 }
2342 s2->pict_type = 0;
2343 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2344 }
2345
2346 input_size = buf_end - buf_ptr;
2347
2348 if (avctx->debug & FF_DEBUG_STARTCODE)
2349 av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %td left %d\n",
2350 start_code, buf_ptr - buf, input_size);
2351
2352 /* prepare data for next start code */
2353 switch (start_code) {
2354 case SEQ_START_CODE:
2355 if (last_code == 0) {
2356 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2357 s->sync = 1;
2358 } else {
2359 av_log(avctx, AV_LOG_ERROR,
2360 "ignoring SEQ_START_CODE after %X\n", last_code);
2361 if (avctx->err_recognition & AV_EF_EXPLODE)
2362 return AVERROR_INVALIDDATA;
2363 }
2364 break;
2365
2366 case PICTURE_START_CODE:
2367 if (s2->width <= 0 || s2->height <= 0) {
2368 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2369 s2->width, s2->height);
2370 return AVERROR_INVALIDDATA;
2371 }
2372
2373 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2374 !avctx->hwaccel && s->slice_count) {
2375 int i;
2376
2377 avctx->execute(avctx, slice_decode_thread,
2378 s2->thread_context, NULL,
2379 s->slice_count, sizeof(void *));
2380 for (i = 0; i < s->slice_count; i++)
2381 s2->er.error_count += s2->thread_context[i]->er.error_count;
2382 s->slice_count = 0;
2383 }
2384 if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2385 ret = mpeg_decode_postinit(avctx);
2386 if (ret < 0) {
2387 av_log(avctx, AV_LOG_ERROR,
2388 "mpeg_decode_postinit() failure\n");
2389 return ret;
2390 }
2391
2392 /* We have a complete image: we try to decompress it. */
2393 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2394 s2->pict_type = 0;
2395 s->first_slice = 1;
2396 last_code = PICTURE_START_CODE;
2397 } else {
2398 av_log(avctx, AV_LOG_ERROR,
2399 "ignoring pic after %X\n", last_code);
2400 if (avctx->err_recognition & AV_EF_EXPLODE)
2401 return AVERROR_INVALIDDATA;
2402 }
2403 break;
2404 case EXT_START_CODE:
2405 init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2406
2407 switch (get_bits(&s2->gb, 4)) {
2408 case 0x1:
2409 if (last_code == 0) {
2410 mpeg_decode_sequence_extension(s);
2411 } else {
2412 av_log(avctx, AV_LOG_ERROR,
2413 "ignoring seq ext after %X\n", last_code);
2414 if (avctx->err_recognition & AV_EF_EXPLODE)
2415 return AVERROR_INVALIDDATA;
2416 }
2417 break;
2418 case 0x2:
2419 mpeg_decode_sequence_display_extension(s);
2420 break;
2421 case 0x3:
2422 mpeg_decode_quant_matrix_extension(s2);
2423 break;
2424 case 0x7:
2425 mpeg_decode_picture_display_extension(s);
2426 break;
2427 case 0x8:
2428 if (last_code == PICTURE_START_CODE) {
2429 mpeg_decode_picture_coding_extension(s);
2430 } else {
2431 av_log(avctx, AV_LOG_ERROR,
2432 "ignoring pic cod ext after %X\n", last_code);
2433 if (avctx->err_recognition & AV_EF_EXPLODE)
2434 return AVERROR_INVALIDDATA;
2435 }
2436 break;
2437 }
2438 break;
2439 case USER_START_CODE:
2440 mpeg_decode_user_data(avctx, buf_ptr, input_size);
2441 break;
2442 case GOP_START_CODE:
2443 if (last_code == 0) {
2444 s2->first_field = 0;
2445 mpeg_decode_gop(avctx, buf_ptr, input_size);
2446 s->sync = 1;
2447 } else {
2448 av_log(avctx, AV_LOG_ERROR,
2449 "ignoring GOP_START_CODE after %X\n", last_code);
2450 if (avctx->err_recognition & AV_EF_EXPLODE)
2451 return AVERROR_INVALIDDATA;
2452 }
2453 break;
2454 default:
2455 if (start_code >= SLICE_MIN_START_CODE &&
2456 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2457 const int field_pic = s2->picture_structure != PICT_FRAME;
2458 int mb_y = (start_code - SLICE_MIN_START_CODE) << field_pic;
2459 last_code = SLICE_MIN_START_CODE;
2460
2461 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2462 mb_y++;
2463
2464 if (mb_y >= s2->mb_height) {
2465 av_log(s2->avctx, AV_LOG_ERROR,
2466 "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2467 return -1;
2468 }
2469
2470 if (s2->last_picture_ptr == NULL) {
2471 /* Skip B-frames if we do not have reference frames and
2472 * GOP is not closed. */
2473 if (s2->pict_type == AV_PICTURE_TYPE_B) {
2474 if (!s->closed_gop) {
2475 skip_frame = 1;
2476 break;
2477 }
2478 }
2479 }
2480 if (s2->pict_type == AV_PICTURE_TYPE_I)
2481 s->sync = 1;
2482 if (s2->next_picture_ptr == NULL) {
2483 /* Skip P-frames if we do not have a reference frame or
2484 * we have an invalid header. */
2485 if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2486 skip_frame = 1;
2487 break;
2488 }
2489 }
2490 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2491 s2->pict_type == AV_PICTURE_TYPE_B) ||
2492 (avctx->skip_frame >= AVDISCARD_NONKEY &&
2493 s2->pict_type != AV_PICTURE_TYPE_I) ||
2494 avctx->skip_frame >= AVDISCARD_ALL) {
2495 skip_frame = 1;
2496 break;
2497 }
2498
2499 if (!s->mpeg_enc_ctx_allocated)
2500 break;
2501
2502 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2503 if (mb_y < avctx->skip_top ||
2504 mb_y >= s2->mb_height - avctx->skip_bottom)
2505 break;
2506 }
2507
2508 if (!s2->pict_type) {
2509 av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2510 if (avctx->err_recognition & AV_EF_EXPLODE)
2511 return AVERROR_INVALIDDATA;
2512 break;
2513 }
2514
2515 if (s->first_slice) {
2516 skip_frame = 0;
2517 s->first_slice = 0;
2518 if (mpeg_field_start(s2, buf, buf_size) < 0)
2519 return -1;
2520 }
2521 if (!s2->current_picture_ptr) {
2522 av_log(avctx, AV_LOG_ERROR,
2523 "current_picture not initialized\n");
2524 return AVERROR_INVALIDDATA;
2525 }
2526
2527 if (HAVE_THREADS &&
2528 (avctx->active_thread_type & FF_THREAD_SLICE) &&
2529 !avctx->hwaccel) {
2530 int threshold = (s2->mb_height * s->slice_count +
2531 s2->slice_context_count / 2) /
2532 s2->slice_context_count;
2533 if (threshold <= mb_y) {
2534 MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2535
2536 thread_context->start_mb_y = mb_y;
2537 thread_context->end_mb_y = s2->mb_height;
2538 if (s->slice_count) {
2539 s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2540 ret = ff_update_duplicate_context(thread_context, s2);
2541 if (ret < 0)
2542 return ret;
2543 }
2544 init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2545 s->slice_count++;
2546 }
2547 buf_ptr += 2; // FIXME add minimum number of bytes per slice
2548 } else {
2549 ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2550 emms_c();
2551
2552 if (ret < 0) {
2553 if (avctx->err_recognition & AV_EF_EXPLODE)
2554 return ret;
2555 if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2556 ff_er_add_slice(&s2->er, s2->resync_mb_x,
2557 s2->resync_mb_y, s2->mb_x, s2->mb_y,
2558 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2559 } else {
2560 ff_er_add_slice(&s2->er, s2->resync_mb_x,
2561 s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2562 ER_AC_END | ER_DC_END | ER_MV_END);
2563 }
2564 }
2565 }
2566 break;
2567 }
2568 }
2569 }
2570
2571 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2572 int *got_output, AVPacket *avpkt)
2573 {
2574 const uint8_t *buf = avpkt->data;
2575 int buf_size = avpkt->size;
2576 Mpeg1Context *s = avctx->priv_data;
2577 AVFrame *picture = data;
2578 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2579 av_dlog(avctx, "fill_buffer\n");
2580
2581 if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2582 /* special case for last picture */
2583 if (s2->low_delay == 0 && s2->next_picture_ptr) {
2584 int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2585 if (ret < 0)
2586 return ret;
2587
2588 s2->next_picture_ptr = NULL;
2589
2590 *got_output = 1;
2591 }
2592 return buf_size;
2593 }
2594
2595 if (s2->flags & CODEC_FLAG_TRUNCATED) {
2596 int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2597 buf_size, NULL);
2598
2599 if (ff_combine_frame(&s2->parse_context, next,
2600 (const uint8_t **) &buf, &buf_size) < 0)
2601 return buf_size;
2602 }
2603
2604 if (s->mpeg_enc_ctx_allocated == 0 && avctx->codec_tag == AV_RL32("VCR2"))
2605 vcr2_init_sequence(avctx);
2606
2607 s->slice_count = 0;
2608
2609 if (avctx->extradata && !s->extradata_decoded) {
2610 int ret = decode_chunks(avctx, picture, got_output,
2611 avctx->extradata, avctx->extradata_size);
2612 s->extradata_decoded = 1;
2613 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
2614 return ret;
2615 }
2616
2617 return decode_chunks(avctx, picture, got_output, buf, buf_size);
2618 }
2619
2620 static void flush(AVCodecContext *avctx)
2621 {
2622 Mpeg1Context *s = avctx->priv_data;
2623
2624 s->sync = 0;
2625 s->closed_gop = 0;
2626
2627 ff_mpeg_flush(avctx);
2628 }
2629
2630 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2631 {
2632 Mpeg1Context *s = avctx->priv_data;
2633
2634 if (s->mpeg_enc_ctx_allocated)
2635 ff_MPV_common_end(&s->mpeg_enc_ctx);
2636 av_freep(&s->a53_caption);
2637 return 0;
2638 }
2639
2640 static const AVProfile mpeg2_video_profiles[] = {
2641 { FF_PROFILE_MPEG2_422, "4:2:2" },
2642 { FF_PROFILE_MPEG2_HIGH, "High" },
2643 { FF_PROFILE_MPEG2_SS, "Spatially Scalable" },
2644 { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable" },
2645 { FF_PROFILE_MPEG2_MAIN, "Main" },
2646 { FF_PROFILE_MPEG2_SIMPLE, "Simple" },
2647 { FF_PROFILE_RESERVED, "Reserved" },
2648 { FF_PROFILE_RESERVED, "Reserved" },
2649 { FF_PROFILE_UNKNOWN },
2650 };
2651
2652 AVCodec ff_mpeg1video_decoder = {
2653 .name = "mpeg1video",
2654 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2655 .type = AVMEDIA_TYPE_VIDEO,
2656 .id = AV_CODEC_ID_MPEG1VIDEO,
2657 .priv_data_size = sizeof(Mpeg1Context),
2658 .init = mpeg_decode_init,
2659 .close = mpeg_decode_end,
2660 .decode = mpeg_decode_frame,
2661 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2662 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2663 CODEC_CAP_SLICE_THREADS,
2664 .flush = flush,
2665 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2666 };
2667
2668 AVCodec ff_mpeg2video_decoder = {
2669 .name = "mpeg2video",
2670 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2671 .type = AVMEDIA_TYPE_VIDEO,
2672 .id = AV_CODEC_ID_MPEG2VIDEO,
2673 .priv_data_size = sizeof(Mpeg1Context),
2674 .init = mpeg_decode_init,
2675 .close = mpeg_decode_end,
2676 .decode = mpeg_decode_frame,
2677 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2678 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2679 CODEC_CAP_SLICE_THREADS,
2680 .flush = flush,
2681 .profiles = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2682 };
2683
2684 #if FF_API_XVMC
2685 #if CONFIG_MPEG_XVMC_DECODER
2686 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2687 {
2688 if (avctx->active_thread_type & FF_THREAD_SLICE)
2689 return -1;
2690 if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2691 return -1;
2692 if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2693 av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2694 }
2695 mpeg_decode_init(avctx);
2696
2697 avctx->pix_fmt = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2698 avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2699
2700 return 0;
2701 }
2702
2703 AVCodec ff_mpeg_xvmc_decoder = {
2704 .name = "mpegvideo_xvmc",
2705 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2706 .type = AVMEDIA_TYPE_VIDEO,
2707 .id = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2708 .priv_data_size = sizeof(Mpeg1Context),
2709 .init = mpeg_mc_decode_init,
2710 .close = mpeg_decode_end,
2711 .decode = mpeg_decode_frame,
2712 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2713 CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2714 .flush = flush,
2715 };
2716
2717 #endif
2718 #endif /* FF_API_XVMC */