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Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / mpeg12dec.c
1 /*
2 * MPEG-1/2 decoder
3 * Copyright (c) 2000, 2001 Fabrice Bellard
4 * Copyright (c) 2002-2013 Michael Niedermayer <michaelni@gmx.at>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 #define UNCHECKED_BITSTREAM_READER 1
29 #include <inttypes.h>
30
31 #include "libavutil/attributes.h"
32 #include "libavutil/internal.h"
33 #include "libavutil/stereo3d.h"
34
35 #include "avcodec.h"
36 #include "bytestream.h"
37 #include "error_resilience.h"
38 #include "idctdsp.h"
39 #include "internal.h"
40 #include "mpeg_er.h"
41 #include "mpeg12.h"
42 #include "mpeg12data.h"
43 #include "mpegutils.h"
44 #include "mpegvideo.h"
45 #include "thread.h"
46 #include "version.h"
47 #include "vdpau_internal.h"
48 #include "xvmc_internal.h"
49
50 typedef struct Mpeg1Context {
51 MpegEncContext mpeg_enc_ctx;
52 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
53 int repeat_field; /* true if we must repeat the field */
54 AVPanScan pan_scan; /* some temporary storage for the panscan */
55 AVStereo3D stereo3d;
56 int has_stereo3d;
57 uint8_t *a53_caption;
58 int a53_caption_size;
59 uint8_t afd;
60 int has_afd;
61 int slice_count;
62 int save_aspect_info;
63 int save_width, save_height, save_progressive_seq;
64 AVRational frame_rate_ext; /* MPEG-2 specific framerate modificator */
65 int sync; /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
66 int tmpgexs;
67 int first_slice;
68 int extradata_decoded;
69 } Mpeg1Context;
70
71 #define MB_TYPE_ZERO_MV 0x20000000
72
73 static const uint32_t ptype2mb_type[7] = {
74 MB_TYPE_INTRA,
75 MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
76 MB_TYPE_L0,
77 MB_TYPE_L0 | MB_TYPE_CBP,
78 MB_TYPE_QUANT | MB_TYPE_INTRA,
79 MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
80 MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
81 };
82
83 static const uint32_t btype2mb_type[11] = {
84 MB_TYPE_INTRA,
85 MB_TYPE_L1,
86 MB_TYPE_L1 | MB_TYPE_CBP,
87 MB_TYPE_L0,
88 MB_TYPE_L0 | MB_TYPE_CBP,
89 MB_TYPE_L0L1,
90 MB_TYPE_L0L1 | MB_TYPE_CBP,
91 MB_TYPE_QUANT | MB_TYPE_INTRA,
92 MB_TYPE_QUANT | MB_TYPE_L1 | MB_TYPE_CBP,
93 MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
94 MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
95 };
96
97 static const uint8_t non_linear_qscale[32] = {
98 0, 1, 2, 3, 4, 5, 6, 7,
99 8, 10, 12, 14, 16, 18, 20, 22,
100 24, 28, 32, 36, 40, 44, 48, 52,
101 56, 64, 72, 80, 88, 96, 104, 112,
102 };
103
104 /* as H.263, but only 17 codes */
105 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
106 {
107 int code, sign, val, shift;
108
109 code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
110 if (code == 0)
111 return pred;
112 if (code < 0)
113 return 0xffff;
114
115 sign = get_bits1(&s->gb);
116 shift = fcode - 1;
117 val = code;
118 if (shift) {
119 val = (val - 1) << shift;
120 val |= get_bits(&s->gb, shift);
121 val++;
122 }
123 if (sign)
124 val = -val;
125 val += pred;
126
127 /* modulo decoding */
128 return sign_extend(val, 5 + shift);
129 }
130
131 #define check_scantable_index(ctx, x) \
132 do { \
133 if ((x) > 63) { \
134 av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", \
135 ctx->mb_x, ctx->mb_y); \
136 return AVERROR_INVALIDDATA; \
137 } \
138 } while (0)
139
140 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
141 int16_t *block, int n)
142 {
143 int level, dc, diff, i, j, run;
144 int component;
145 RLTable *rl = &ff_rl_mpeg1;
146 uint8_t *const scantable = s->intra_scantable.permutated;
147 const uint16_t *quant_matrix = s->intra_matrix;
148 const int qscale = s->qscale;
149
150 /* DC coefficient */
151 component = (n <= 3 ? 0 : n - 4 + 1);
152 diff = decode_dc(&s->gb, component);
153 if (diff >= 0xffff)
154 return -1;
155 dc = s->last_dc[component];
156 dc += diff;
157 s->last_dc[component] = dc;
158 block[0] = dc * quant_matrix[0];
159 av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
160 i = 0;
161 {
162 OPEN_READER(re, &s->gb);
163 UPDATE_CACHE(re, &s->gb);
164 if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
165 goto end;
166
167 /* now quantify & encode AC coefficients */
168 for (;;) {
169 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
170 TEX_VLC_BITS, 2, 0);
171
172 if (level != 0) {
173 i += run;
174 check_scantable_index(s, i);
175 j = scantable[i];
176 level = (level * qscale * quant_matrix[j]) >> 4;
177 level = (level - 1) | 1;
178 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
179 SHOW_SBITS(re, &s->gb, 1);
180 SKIP_BITS(re, &s->gb, 1);
181 } else {
182 /* escape */
183 run = SHOW_UBITS(re, &s->gb, 6) + 1;
184 LAST_SKIP_BITS(re, &s->gb, 6);
185 UPDATE_CACHE(re, &s->gb);
186 level = SHOW_SBITS(re, &s->gb, 8);
187 SKIP_BITS(re, &s->gb, 8);
188 if (level == -128) {
189 level = SHOW_UBITS(re, &s->gb, 8) - 256;
190 SKIP_BITS(re, &s->gb, 8);
191 } else if (level == 0) {
192 level = SHOW_UBITS(re, &s->gb, 8);
193 SKIP_BITS(re, &s->gb, 8);
194 }
195 i += run;
196 check_scantable_index(s, i);
197 j = scantable[i];
198 if (level < 0) {
199 level = -level;
200 level = (level * qscale * quant_matrix[j]) >> 4;
201 level = (level - 1) | 1;
202 level = -level;
203 } else {
204 level = (level * qscale * quant_matrix[j]) >> 4;
205 level = (level - 1) | 1;
206 }
207 }
208
209 block[j] = level;
210 if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
211 break;
212
213 UPDATE_CACHE(re, &s->gb);
214 }
215 end:
216 LAST_SKIP_BITS(re, &s->gb, 2);
217 CLOSE_READER(re, &s->gb);
218 }
219 s->block_last_index[n] = i;
220 return 0;
221 }
222
223 int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
224 {
225 return mpeg1_decode_block_intra(s, block, n);
226 }
227
228 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
229 int16_t *block, int n)
230 {
231 int level, i, j, run;
232 RLTable *rl = &ff_rl_mpeg1;
233 uint8_t *const scantable = s->intra_scantable.permutated;
234 const uint16_t *quant_matrix = s->inter_matrix;
235 const int qscale = s->qscale;
236
237 {
238 OPEN_READER(re, &s->gb);
239 i = -1;
240 // special case for first coefficient, no need to add second VLC table
241 UPDATE_CACHE(re, &s->gb);
242 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
243 level = (3 * qscale * quant_matrix[0]) >> 5;
244 level = (level - 1) | 1;
245 if (GET_CACHE(re, &s->gb) & 0x40000000)
246 level = -level;
247 block[0] = level;
248 i++;
249 SKIP_BITS(re, &s->gb, 2);
250 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
251 goto end;
252 }
253 /* now quantify & encode AC coefficients */
254 for (;;) {
255 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
256 TEX_VLC_BITS, 2, 0);
257
258 if (level != 0) {
259 i += run;
260 check_scantable_index(s, i);
261 j = scantable[i];
262 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
263 level = (level - 1) | 1;
264 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
265 SHOW_SBITS(re, &s->gb, 1);
266 SKIP_BITS(re, &s->gb, 1);
267 } else {
268 /* escape */
269 run = SHOW_UBITS(re, &s->gb, 6) + 1;
270 LAST_SKIP_BITS(re, &s->gb, 6);
271 UPDATE_CACHE(re, &s->gb);
272 level = SHOW_SBITS(re, &s->gb, 8);
273 SKIP_BITS(re, &s->gb, 8);
274 if (level == -128) {
275 level = SHOW_UBITS(re, &s->gb, 8) - 256;
276 SKIP_BITS(re, &s->gb, 8);
277 } else if (level == 0) {
278 level = SHOW_UBITS(re, &s->gb, 8);
279 SKIP_BITS(re, &s->gb, 8);
280 }
281 i += run;
282 check_scantable_index(s, i);
283 j = scantable[i];
284 if (level < 0) {
285 level = -level;
286 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
287 level = (level - 1) | 1;
288 level = -level;
289 } else {
290 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
291 level = (level - 1) | 1;
292 }
293 }
294
295 block[j] = level;
296 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
297 break;
298 UPDATE_CACHE(re, &s->gb);
299 }
300 end:
301 LAST_SKIP_BITS(re, &s->gb, 2);
302 CLOSE_READER(re, &s->gb);
303 }
304 s->block_last_index[n] = i;
305 return 0;
306 }
307
308 /**
309 * Note: this function can read out of range and crash for corrupt streams.
310 * Changing this would eat up any speed benefits it has.
311 * Do not use "fast" flag if you need the code to be robust.
312 */
313 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
314 int16_t *block, int n)
315 {
316 int level, i, j, run;
317 RLTable *rl = &ff_rl_mpeg1;
318 uint8_t *const scantable = s->intra_scantable.permutated;
319 const int qscale = s->qscale;
320
321 {
322 OPEN_READER(re, &s->gb);
323 i = -1;
324 // Special case for first coefficient, no need to add second VLC table.
325 UPDATE_CACHE(re, &s->gb);
326 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
327 level = (3 * qscale) >> 1;
328 level = (level - 1) | 1;
329 if (GET_CACHE(re, &s->gb) & 0x40000000)
330 level = -level;
331 block[0] = level;
332 i++;
333 SKIP_BITS(re, &s->gb, 2);
334 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
335 goto end;
336 }
337
338 /* now quantify & encode AC coefficients */
339 for (;;) {
340 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
341 TEX_VLC_BITS, 2, 0);
342
343 if (level != 0) {
344 i += run;
345 check_scantable_index(s, i);
346 j = scantable[i];
347 level = ((level * 2 + 1) * qscale) >> 1;
348 level = (level - 1) | 1;
349 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
350 SHOW_SBITS(re, &s->gb, 1);
351 SKIP_BITS(re, &s->gb, 1);
352 } else {
353 /* escape */
354 run = SHOW_UBITS(re, &s->gb, 6) + 1;
355 LAST_SKIP_BITS(re, &s->gb, 6);
356 UPDATE_CACHE(re, &s->gb);
357 level = SHOW_SBITS(re, &s->gb, 8);
358 SKIP_BITS(re, &s->gb, 8);
359 if (level == -128) {
360 level = SHOW_UBITS(re, &s->gb, 8) - 256;
361 SKIP_BITS(re, &s->gb, 8);
362 } else if (level == 0) {
363 level = SHOW_UBITS(re, &s->gb, 8);
364 SKIP_BITS(re, &s->gb, 8);
365 }
366 i += run;
367 check_scantable_index(s, i);
368 j = scantable[i];
369 if (level < 0) {
370 level = -level;
371 level = ((level * 2 + 1) * qscale) >> 1;
372 level = (level - 1) | 1;
373 level = -level;
374 } else {
375 level = ((level * 2 + 1) * qscale) >> 1;
376 level = (level - 1) | 1;
377 }
378 }
379
380 block[j] = level;
381 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
382 break;
383 UPDATE_CACHE(re, &s->gb);
384 }
385 end:
386 LAST_SKIP_BITS(re, &s->gb, 2);
387 CLOSE_READER(re, &s->gb);
388 }
389 s->block_last_index[n] = i;
390 return 0;
391 }
392
393 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
394 int16_t *block, int n)
395 {
396 int level, i, j, run;
397 RLTable *rl = &ff_rl_mpeg1;
398 uint8_t *const scantable = s->intra_scantable.permutated;
399 const uint16_t *quant_matrix;
400 const int qscale = s->qscale;
401 int mismatch;
402
403 mismatch = 1;
404
405 {
406 OPEN_READER(re, &s->gb);
407 i = -1;
408 if (n < 4)
409 quant_matrix = s->inter_matrix;
410 else
411 quant_matrix = s->chroma_inter_matrix;
412
413 // Special case for first coefficient, no need to add second VLC table.
414 UPDATE_CACHE(re, &s->gb);
415 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
416 level = (3 * qscale * quant_matrix[0]) >> 5;
417 if (GET_CACHE(re, &s->gb) & 0x40000000)
418 level = -level;
419 block[0] = level;
420 mismatch ^= level;
421 i++;
422 SKIP_BITS(re, &s->gb, 2);
423 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
424 goto end;
425 }
426
427 /* now quantify & encode AC coefficients */
428 for (;;) {
429 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
430 TEX_VLC_BITS, 2, 0);
431
432 if (level != 0) {
433 i += run;
434 check_scantable_index(s, i);
435 j = scantable[i];
436 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
437 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
438 SHOW_SBITS(re, &s->gb, 1);
439 SKIP_BITS(re, &s->gb, 1);
440 } else {
441 /* escape */
442 run = SHOW_UBITS(re, &s->gb, 6) + 1;
443 LAST_SKIP_BITS(re, &s->gb, 6);
444 UPDATE_CACHE(re, &s->gb);
445 level = SHOW_SBITS(re, &s->gb, 12);
446 SKIP_BITS(re, &s->gb, 12);
447
448 i += run;
449 check_scantable_index(s, i);
450 j = scantable[i];
451 if (level < 0) {
452 level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
453 level = -level;
454 } else {
455 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
456 }
457 }
458
459 mismatch ^= level;
460 block[j] = level;
461 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
462 break;
463 UPDATE_CACHE(re, &s->gb);
464 }
465 end:
466 LAST_SKIP_BITS(re, &s->gb, 2);
467 CLOSE_READER(re, &s->gb);
468 }
469 block[63] ^= (mismatch & 1);
470
471 s->block_last_index[n] = i;
472 return 0;
473 }
474
475 /**
476 * Note: this function can read out of range and crash for corrupt streams.
477 * Changing this would eat up any speed benefits it has.
478 * Do not use "fast" flag if you need the code to be robust.
479 */
480 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
481 int16_t *block, int n)
482 {
483 int level, i, j, run;
484 RLTable *rl = &ff_rl_mpeg1;
485 uint8_t *const scantable = s->intra_scantable.permutated;
486 const int qscale = s->qscale;
487 OPEN_READER(re, &s->gb);
488 i = -1;
489
490 // special case for first coefficient, no need to add second VLC table
491 UPDATE_CACHE(re, &s->gb);
492 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
493 level = (3 * qscale) >> 1;
494 if (GET_CACHE(re, &s->gb) & 0x40000000)
495 level = -level;
496 block[0] = level;
497 i++;
498 SKIP_BITS(re, &s->gb, 2);
499 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
500 goto end;
501 }
502
503 /* now quantify & encode AC coefficients */
504 for (;;) {
505 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
506
507 if (level != 0) {
508 i += run;
509 j = scantable[i];
510 level = ((level * 2 + 1) * qscale) >> 1;
511 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
512 SHOW_SBITS(re, &s->gb, 1);
513 SKIP_BITS(re, &s->gb, 1);
514 } else {
515 /* escape */
516 run = SHOW_UBITS(re, &s->gb, 6) + 1;
517 LAST_SKIP_BITS(re, &s->gb, 6);
518 UPDATE_CACHE(re, &s->gb);
519 level = SHOW_SBITS(re, &s->gb, 12);
520 SKIP_BITS(re, &s->gb, 12);
521
522 i += run;
523 j = scantable[i];
524 if (level < 0) {
525 level = ((-level * 2 + 1) * qscale) >> 1;
526 level = -level;
527 } else {
528 level = ((level * 2 + 1) * qscale) >> 1;
529 }
530 }
531
532 block[j] = level;
533 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
534 break;
535
536 UPDATE_CACHE(re, &s->gb);
537 }
538 end:
539 LAST_SKIP_BITS(re, &s->gb, 2);
540 CLOSE_READER(re, &s->gb);
541 s->block_last_index[n] = i;
542 return 0;
543 }
544
545 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
546 int16_t *block, int n)
547 {
548 int level, dc, diff, i, j, run;
549 int component;
550 RLTable *rl;
551 uint8_t *const scantable = s->intra_scantable.permutated;
552 const uint16_t *quant_matrix;
553 const int qscale = s->qscale;
554 int mismatch;
555
556 /* DC coefficient */
557 if (n < 4) {
558 quant_matrix = s->intra_matrix;
559 component = 0;
560 } else {
561 quant_matrix = s->chroma_intra_matrix;
562 component = (n & 1) + 1;
563 }
564 diff = decode_dc(&s->gb, component);
565 if (diff >= 0xffff)
566 return -1;
567 dc = s->last_dc[component];
568 dc += diff;
569 s->last_dc[component] = dc;
570 block[0] = dc << (3 - s->intra_dc_precision);
571 av_dlog(s->avctx, "dc=%d\n", block[0]);
572 mismatch = block[0] ^ 1;
573 i = 0;
574 if (s->intra_vlc_format)
575 rl = &ff_rl_mpeg2;
576 else
577 rl = &ff_rl_mpeg1;
578
579 {
580 OPEN_READER(re, &s->gb);
581 /* now quantify & encode AC coefficients */
582 for (;;) {
583 UPDATE_CACHE(re, &s->gb);
584 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
585 TEX_VLC_BITS, 2, 0);
586
587 if (level == 127) {
588 break;
589 } else if (level != 0) {
590 i += run;
591 check_scantable_index(s, i);
592 j = scantable[i];
593 level = (level * qscale * quant_matrix[j]) >> 4;
594 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
595 SHOW_SBITS(re, &s->gb, 1);
596 LAST_SKIP_BITS(re, &s->gb, 1);
597 } else {
598 /* escape */
599 run = SHOW_UBITS(re, &s->gb, 6) + 1;
600 LAST_SKIP_BITS(re, &s->gb, 6);
601 UPDATE_CACHE(re, &s->gb);
602 level = SHOW_SBITS(re, &s->gb, 12);
603 SKIP_BITS(re, &s->gb, 12);
604 i += run;
605 check_scantable_index(s, i);
606 j = scantable[i];
607 if (level < 0) {
608 level = (-level * qscale * quant_matrix[j]) >> 4;
609 level = -level;
610 } else {
611 level = (level * qscale * quant_matrix[j]) >> 4;
612 }
613 }
614
615 mismatch ^= level;
616 block[j] = level;
617 }
618 CLOSE_READER(re, &s->gb);
619 }
620 block[63] ^= mismatch & 1;
621
622 s->block_last_index[n] = i;
623 return 0;
624 }
625
626 /**
627 * Note: this function can read out of range and crash for corrupt streams.
628 * Changing this would eat up any speed benefits it has.
629 * Do not use "fast" flag if you need the code to be robust.
630 */
631 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
632 int16_t *block, int n)
633 {
634 int level, dc, diff, i, j, run;
635 int component;
636 RLTable *rl;
637 uint8_t *const scantable = s->intra_scantable.permutated;
638 const uint16_t *quant_matrix;
639 const int qscale = s->qscale;
640
641 /* DC coefficient */
642 if (n < 4) {
643 quant_matrix = s->intra_matrix;
644 component = 0;
645 } else {
646 quant_matrix = s->chroma_intra_matrix;
647 component = (n & 1) + 1;
648 }
649 diff = decode_dc(&s->gb, component);
650 if (diff >= 0xffff)
651 return -1;
652 dc = s->last_dc[component];
653 dc += diff;
654 s->last_dc[component] = dc;
655 block[0] = dc << (3 - s->intra_dc_precision);
656 i = 0;
657 if (s->intra_vlc_format)
658 rl = &ff_rl_mpeg2;
659 else
660 rl = &ff_rl_mpeg1;
661
662 {
663 OPEN_READER(re, &s->gb);
664 /* now quantify & encode AC coefficients */
665 for (;;) {
666 UPDATE_CACHE(re, &s->gb);
667 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
668 TEX_VLC_BITS, 2, 0);
669
670 if (level >= 64 || i > 63) {
671 break;
672 } else if (level != 0) {
673 i += run;
674 j = scantable[i];
675 level = (level * qscale * quant_matrix[j]) >> 4;
676 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
677 SHOW_SBITS(re, &s->gb, 1);
678 LAST_SKIP_BITS(re, &s->gb, 1);
679 } else {
680 /* escape */
681 run = SHOW_UBITS(re, &s->gb, 6) + 1;
682 LAST_SKIP_BITS(re, &s->gb, 6);
683 UPDATE_CACHE(re, &s->gb);
684 level = SHOW_SBITS(re, &s->gb, 12);
685 SKIP_BITS(re, &s->gb, 12);
686 i += run;
687 j = scantable[i];
688 if (level < 0) {
689 level = (-level * qscale * quant_matrix[j]) >> 4;
690 level = -level;
691 } else {
692 level = (level * qscale * quant_matrix[j]) >> 4;
693 }
694 }
695
696 block[j] = level;
697 }
698 CLOSE_READER(re, &s->gb);
699 }
700
701 s->block_last_index[n] = i;
702 return 0;
703 }
704
705 /******************************************/
706 /* decoding */
707
708 static inline int get_dmv(MpegEncContext *s)
709 {
710 if (get_bits1(&s->gb))
711 return 1 - (get_bits1(&s->gb) << 1);
712 else
713 return 0;
714 }
715
716 static inline int get_qscale(MpegEncContext *s)
717 {
718 int qscale = get_bits(&s->gb, 5);
719 if (s->q_scale_type)
720 return non_linear_qscale[qscale];
721 else
722 return qscale << 1;
723 }
724
725
726 /* motion type (for MPEG-2) */
727 #define MT_FIELD 1
728 #define MT_FRAME 2
729 #define MT_16X8 2
730 #define MT_DMV 3
731
732 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
733 {
734 int i, j, k, cbp, val, mb_type, motion_type;
735 const int mb_block_count = 4 + (1 << s->chroma_format);
736 int ret;
737
738 av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
739
740 av_assert2(s->mb_skipped == 0);
741
742 if (s->mb_skip_run-- != 0) {
743 if (s->pict_type == AV_PICTURE_TYPE_P) {
744 s->mb_skipped = 1;
745 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
746 MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
747 } else {
748 int mb_type;
749
750 if (s->mb_x)
751 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
752 else
753 // FIXME not sure if this is allowed in MPEG at all
754 mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
755 if (IS_INTRA(mb_type)) {
756 av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
757 return AVERROR_INVALIDDATA;
758 }
759 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
760 mb_type | MB_TYPE_SKIP;
761
762 if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
763 s->mb_skipped = 1;
764 }
765
766 return 0;
767 }
768
769 switch (s->pict_type) {
770 default:
771 case AV_PICTURE_TYPE_I:
772 if (get_bits1(&s->gb) == 0) {
773 if (get_bits1(&s->gb) == 0) {
774 av_log(s->avctx, AV_LOG_ERROR,
775 "invalid mb type in I Frame at %d %d\n",
776 s->mb_x, s->mb_y);
777 return AVERROR_INVALIDDATA;
778 }
779 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
780 } else {
781 mb_type = MB_TYPE_INTRA;
782 }
783 break;
784 case AV_PICTURE_TYPE_P:
785 mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
786 if (mb_type < 0) {
787 av_log(s->avctx, AV_LOG_ERROR,
788 "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
789 return AVERROR_INVALIDDATA;
790 }
791 mb_type = ptype2mb_type[mb_type];
792 break;
793 case AV_PICTURE_TYPE_B:
794 mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
795 if (mb_type < 0) {
796 av_log(s->avctx, AV_LOG_ERROR,
797 "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
798 return AVERROR_INVALIDDATA;
799 }
800 mb_type = btype2mb_type[mb_type];
801 break;
802 }
803 av_dlog(s->avctx, "mb_type=%x\n", mb_type);
804 // motion_type = 0; /* avoid warning */
805 if (IS_INTRA(mb_type)) {
806 s->bdsp.clear_blocks(s->block[0]);
807
808 if (!s->chroma_y_shift)
809 s->bdsp.clear_blocks(s->block[6]);
810
811 /* compute DCT type */
812 // FIXME: add an interlaced_dct coded var?
813 if (s->picture_structure == PICT_FRAME &&
814 !s->frame_pred_frame_dct)
815 s->interlaced_dct = get_bits1(&s->gb);
816
817 if (IS_QUANT(mb_type))
818 s->qscale = get_qscale(s);
819
820 if (s->concealment_motion_vectors) {
821 /* just parse them */
822 if (s->picture_structure != PICT_FRAME)
823 skip_bits1(&s->gb); /* field select */
824
825 s->mv[0][0][0] =
826 s->last_mv[0][0][0] =
827 s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
828 s->last_mv[0][0][0]);
829 s->mv[0][0][1] =
830 s->last_mv[0][0][1] =
831 s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
832 s->last_mv[0][0][1]);
833
834 skip_bits1(&s->gb); /* marker */
835 } else {
836 /* reset mv prediction */
837 memset(s->last_mv, 0, sizeof(s->last_mv));
838 }
839 s->mb_intra = 1;
840 // if 1, we memcpy blocks in xvmcvideo
841 if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
842 ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
843
844 if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
845 if (s->flags2 & CODEC_FLAG2_FAST) {
846 for (i = 0; i < 6; i++)
847 mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
848 } else {
849 for (i = 0; i < mb_block_count; i++)
850 if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
851 return ret;
852 }
853 } else {
854 for (i = 0; i < 6; i++)
855 if ((ret = mpeg1_decode_block_intra(s, *s->pblocks[i], i)) < 0)
856 return ret;
857 }
858 } else {
859 if (mb_type & MB_TYPE_ZERO_MV) {
860 av_assert2(mb_type & MB_TYPE_CBP);
861
862 s->mv_dir = MV_DIR_FORWARD;
863 if (s->picture_structure == PICT_FRAME) {
864 if (s->picture_structure == PICT_FRAME
865 && !s->frame_pred_frame_dct)
866 s->interlaced_dct = get_bits1(&s->gb);
867 s->mv_type = MV_TYPE_16X16;
868 } else {
869 s->mv_type = MV_TYPE_FIELD;
870 mb_type |= MB_TYPE_INTERLACED;
871 s->field_select[0][0] = s->picture_structure - 1;
872 }
873
874 if (IS_QUANT(mb_type))
875 s->qscale = get_qscale(s);
876
877 s->last_mv[0][0][0] = 0;
878 s->last_mv[0][0][1] = 0;
879 s->last_mv[0][1][0] = 0;
880 s->last_mv[0][1][1] = 0;
881 s->mv[0][0][0] = 0;
882 s->mv[0][0][1] = 0;
883 } else {
884 av_assert2(mb_type & MB_TYPE_L0L1);
885 // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
886 /* get additional motion vector type */
887 if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
888 motion_type = MT_FRAME;
889 } else {
890 motion_type = get_bits(&s->gb, 2);
891 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
892 s->interlaced_dct = get_bits1(&s->gb);
893 }
894
895 if (IS_QUANT(mb_type))
896 s->qscale = get_qscale(s);
897
898 /* motion vectors */
899 s->mv_dir = (mb_type >> 13) & 3;
900 av_dlog(s->avctx, "motion_type=%d\n", motion_type);
901 switch (motion_type) {
902 case MT_FRAME: /* or MT_16X8 */
903 if (s->picture_structure == PICT_FRAME) {
904 mb_type |= MB_TYPE_16x16;
905 s->mv_type = MV_TYPE_16X16;
906 for (i = 0; i < 2; i++) {
907 if (USES_LIST(mb_type, i)) {
908 /* MT_FRAME */
909 s->mv[i][0][0] =
910 s->last_mv[i][0][0] =
911 s->last_mv[i][1][0] =
912 mpeg_decode_motion(s, s->mpeg_f_code[i][0],
913 s->last_mv[i][0][0]);
914 s->mv[i][0][1] =
915 s->last_mv[i][0][1] =
916 s->last_mv[i][1][1] =
917 mpeg_decode_motion(s, s->mpeg_f_code[i][1],
918 s->last_mv[i][0][1]);
919 /* full_pel: only for MPEG-1 */
920 if (s->full_pel[i]) {
921 s->mv[i][0][0] <<= 1;
922 s->mv[i][0][1] <<= 1;
923 }
924 }
925 }
926 } else {
927 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
928 s->mv_type = MV_TYPE_16X8;
929 for (i = 0; i < 2; i++) {
930 if (USES_LIST(mb_type, i)) {
931 /* MT_16X8 */
932 for (j = 0; j < 2; j++) {
933 s->field_select[i][j] = get_bits1(&s->gb);
934 for (k = 0; k < 2; k++) {
935 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
936 s->last_mv[i][j][k]);
937 s->last_mv[i][j][k] = val;
938 s->mv[i][j][k] = val;
939 }
940 }
941 }
942 }
943 }
944 break;
945 case MT_FIELD:
946 s->mv_type = MV_TYPE_FIELD;
947 if (s->picture_structure == PICT_FRAME) {
948 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
949 for (i = 0; i < 2; i++) {
950 if (USES_LIST(mb_type, i)) {
951 for (j = 0; j < 2; j++) {
952 s->field_select[i][j] = get_bits1(&s->gb);
953 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
954 s->last_mv[i][j][0]);
955 s->last_mv[i][j][0] = val;
956 s->mv[i][j][0] = val;
957 av_dlog(s->avctx, "fmx=%d\n", val);
958 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
959 s->last_mv[i][j][1] >> 1);
960 s->last_mv[i][j][1] = val << 1;
961 s->mv[i][j][1] = val;
962 av_dlog(s->avctx, "fmy=%d\n", val);
963 }
964 }
965 }
966 } else {
967 av_assert0(!s->progressive_sequence);
968 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
969 for (i = 0; i < 2; i++) {
970 if (USES_LIST(mb_type, i)) {
971 s->field_select[i][0] = get_bits1(&s->gb);
972 for (k = 0; k < 2; k++) {
973 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
974 s->last_mv[i][0][k]);
975 s->last_mv[i][0][k] = val;
976 s->last_mv[i][1][k] = val;
977 s->mv[i][0][k] = val;
978 }
979 }
980 }
981 }
982 break;
983 case MT_DMV:
984 if (s->progressive_sequence){
985 av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
986 return AVERROR_INVALIDDATA;
987 }
988 s->mv_type = MV_TYPE_DMV;
989 for (i = 0; i < 2; i++) {
990 if (USES_LIST(mb_type, i)) {
991 int dmx, dmy, mx, my, m;
992 const int my_shift = s->picture_structure == PICT_FRAME;
993
994 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
995 s->last_mv[i][0][0]);
996 s->last_mv[i][0][0] = mx;
997 s->last_mv[i][1][0] = mx;
998 dmx = get_dmv(s);
999 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1000 s->last_mv[i][0][1] >> my_shift);
1001 dmy = get_dmv(s);
1002
1003
1004 s->last_mv[i][0][1] = my << my_shift;
1005 s->last_mv[i][1][1] = my << my_shift;
1006
1007 s->mv[i][0][0] = mx;
1008 s->mv[i][0][1] = my;
1009 s->mv[i][1][0] = mx; // not used
1010 s->mv[i][1][1] = my; // not used
1011
1012 if (s->picture_structure == PICT_FRAME) {
1013 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1014
1015 // m = 1 + 2 * s->top_field_first;
1016 m = s->top_field_first ? 1 : 3;
1017
1018 /* top -> top pred */
1019 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1020 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1021 m = 4 - m;
1022 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1023 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1024 } else {
1025 mb_type |= MB_TYPE_16x16;
1026
1027 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1028 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1029 if (s->picture_structure == PICT_TOP_FIELD)
1030 s->mv[i][2][1]--;
1031 else
1032 s->mv[i][2][1]++;
1033 }
1034 }
1035 }
1036 break;
1037 default:
1038 av_log(s->avctx, AV_LOG_ERROR,
1039 "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1040 return AVERROR_INVALIDDATA;
1041 }
1042 }
1043
1044 s->mb_intra = 0;
1045 if (HAS_CBP(mb_type)) {
1046 s->bdsp.clear_blocks(s->block[0]);
1047
1048 cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1049 if (mb_block_count > 6) {
1050 cbp <<= mb_block_count - 6;
1051 cbp |= get_bits(&s->gb, mb_block_count - 6);
1052 s->bdsp.clear_blocks(s->block[6]);
1053 }
1054 if (cbp <= 0) {
1055 av_log(s->avctx, AV_LOG_ERROR,
1056 "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
1057 return AVERROR_INVALIDDATA;
1058 }
1059
1060 // if 1, we memcpy blocks in xvmcvideo
1061 if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1062 ff_xvmc_pack_pblocks(s, cbp);
1063
1064 if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1065 if (s->flags2 & CODEC_FLAG2_FAST) {
1066 for (i = 0; i < 6; i++) {
1067 if (cbp & 32)
1068 mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1069 else
1070 s->block_last_index[i] = -1;
1071 cbp += cbp;
1072 }
1073 } else {
1074 cbp <<= 12 - mb_block_count;
1075
1076 for (i = 0; i < mb_block_count; i++) {
1077 if (cbp & (1 << 11)) {
1078 if ((ret = mpeg2_decode_block_non_intra(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 } else {
1087 if (s->flags2 & CODEC_FLAG2_FAST) {
1088 for (i = 0; i < 6; i++) {
1089 if (cbp & 32)
1090 mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1091 else
1092 s->block_last_index[i] = -1;
1093 cbp += cbp;
1094 }
1095 } else {
1096 for (i = 0; i < 6; i++) {
1097 if (cbp & 32) {
1098 if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1099 return ret;
1100 } else {
1101 s->block_last_index[i] = -1;
1102 }
1103 cbp += cbp;
1104 }
1105 }
1106 }
1107 } else {
1108 for (i = 0; i < 12; i++)
1109 s->block_last_index[i] = -1;
1110 }
1111 }
1112
1113 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1114
1115 return 0;
1116 }
1117
1118 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1119 {
1120 Mpeg1Context *s = avctx->priv_data;
1121 MpegEncContext *s2 = &s->mpeg_enc_ctx;
1122
1123 ff_mpv_decode_defaults(s2);
1124
1125 if ( avctx->codec_tag != AV_RL32("VCR2")
1126 && avctx->codec_tag != AV_RL32("BW10"))
1127 avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1128 ff_mpv_decode_init(s2, avctx);
1129
1130 s->mpeg_enc_ctx.avctx = avctx;
1131
1132 /* we need some permutation to store matrices,
1133 * until the decoder sets the real permutation. */
1134 ff_mpv_idct_init(s2);
1135 ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1136 ff_mpeg12_init_vlcs();
1137
1138 s->mpeg_enc_ctx_allocated = 0;
1139 s->mpeg_enc_ctx.picture_number = 0;
1140 s->repeat_field = 0;
1141 s->mpeg_enc_ctx.codec_id = avctx->codec->id;
1142 avctx->color_range = AVCOL_RANGE_MPEG;
1143 if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1144 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1145 else
1146 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1147 return 0;
1148 }
1149
1150 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1151 const AVCodecContext *avctx_from)
1152 {
1153 Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1154 MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1155 int err;
1156
1157 if (avctx == avctx_from ||
1158 !ctx_from->mpeg_enc_ctx_allocated ||
1159 !s1->context_initialized)
1160 return 0;
1161
1162 err = ff_mpeg_update_thread_context(avctx, avctx_from);
1163 if (err)
1164 return err;
1165
1166 if (!ctx->mpeg_enc_ctx_allocated)
1167 memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1168
1169 if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1170 s->picture_number++;
1171
1172 return 0;
1173 }
1174
1175 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1176 const uint8_t *new_perm)
1177 {
1178 uint16_t temp_matrix[64];
1179 int i;
1180
1181 memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1182
1183 for (i = 0; i < 64; i++)
1184 matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1185 }
1186
1187 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1188 #if CONFIG_MPEG1_XVMC_HWACCEL
1189 AV_PIX_FMT_XVMC,
1190 #endif
1191 #if CONFIG_MPEG1_VDPAU_HWACCEL
1192 AV_PIX_FMT_VDPAU_MPEG1,
1193 AV_PIX_FMT_VDPAU,
1194 #endif
1195 AV_PIX_FMT_YUV420P,
1196 AV_PIX_FMT_NONE
1197 };
1198
1199 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1200 #if CONFIG_MPEG2_XVMC_HWACCEL
1201 AV_PIX_FMT_XVMC,
1202 #endif
1203 #if CONFIG_MPEG2_VDPAU_HWACCEL
1204 AV_PIX_FMT_VDPAU_MPEG2,
1205 AV_PIX_FMT_VDPAU,
1206 #endif
1207 #if CONFIG_MPEG2_DXVA2_HWACCEL
1208 AV_PIX_FMT_DXVA2_VLD,
1209 #endif
1210 #if CONFIG_MPEG2_VAAPI_HWACCEL
1211 AV_PIX_FMT_VAAPI_VLD,
1212 #endif
1213 AV_PIX_FMT_YUV420P,
1214 AV_PIX_FMT_NONE
1215 };
1216
1217 static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1218 AV_PIX_FMT_YUV422P,
1219 AV_PIX_FMT_NONE
1220 };
1221
1222 static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1223 AV_PIX_FMT_YUV444P,
1224 AV_PIX_FMT_NONE
1225 };
1226
1227 static inline int uses_vdpau(AVCodecContext *avctx) {
1228 return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1229 }
1230
1231 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1232 {
1233 Mpeg1Context *s1 = avctx->priv_data;
1234 MpegEncContext *s = &s1->mpeg_enc_ctx;
1235 const enum AVPixelFormat *pix_fmts;
1236
1237 if (s->chroma_format < 2)
1238 pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1239 mpeg1_hwaccel_pixfmt_list_420 :
1240 mpeg2_hwaccel_pixfmt_list_420;
1241 else if (s->chroma_format == 2)
1242 pix_fmts = mpeg12_pixfmt_list_422;
1243 else
1244 pix_fmts = mpeg12_pixfmt_list_444;
1245
1246 return ff_thread_get_format(avctx, pix_fmts);
1247 }
1248
1249 static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1250 {
1251 // until then pix_fmt may be changed right after codec init
1252 if (avctx->hwaccel || uses_vdpau(avctx))
1253 if (avctx->idct_algo == FF_IDCT_AUTO)
1254 avctx->idct_algo = FF_IDCT_SIMPLE;
1255
1256 if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1257 Mpeg1Context *s1 = avctx->priv_data;
1258 MpegEncContext *s = &s1->mpeg_enc_ctx;
1259
1260 s->pack_pblocks = 1;
1261 #if FF_API_XVMC
1262 avctx->xvmc_acceleration = 2;
1263 #endif /* FF_API_XVMC */
1264 }
1265 }
1266
1267 /* Call this function when we know all parameters.
1268 * It may be called in different places for MPEG-1 and MPEG-2. */
1269 static int mpeg_decode_postinit(AVCodecContext *avctx)
1270 {
1271 Mpeg1Context *s1 = avctx->priv_data;
1272 MpegEncContext *s = &s1->mpeg_enc_ctx;
1273 uint8_t old_permutation[64];
1274 int ret;
1275
1276 if ((s1->mpeg_enc_ctx_allocated == 0) ||
1277 avctx->coded_width != s->width ||
1278 avctx->coded_height != s->height ||
1279 s1->save_width != s->width ||
1280 s1->save_height != s->height ||
1281 s1->save_aspect_info != s->aspect_ratio_info ||
1282 (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1283 0) {
1284 if (s1->mpeg_enc_ctx_allocated) {
1285 ParseContext pc = s->parse_context;
1286 s->parse_context.buffer = 0;
1287 ff_mpv_common_end(s);
1288 s->parse_context = pc;
1289 s1->mpeg_enc_ctx_allocated = 0;
1290 }
1291
1292 if ((s->width == 0) || (s->height == 0))
1293 return -2;
1294
1295 ret = ff_set_dimensions(avctx, s->width, s->height);
1296 if (ret < 0)
1297 return ret;
1298
1299 if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1300 avctx->rc_max_rate = s->bit_rate;
1301 } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1302 (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1303 avctx->bit_rate = s->bit_rate;
1304 }
1305 s1->save_aspect_info = s->aspect_ratio_info;
1306 s1->save_width = s->width;
1307 s1->save_height = s->height;
1308 s1->save_progressive_seq = s->progressive_sequence;
1309
1310 /* low_delay may be forced, in this case we will have B-frames
1311 * that behave like P-frames. */
1312 avctx->has_b_frames = !s->low_delay;
1313
1314 if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1315 // MPEG-1 fps
1316 avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1317 // MPEG-1 aspect
1318 avctx->sample_aspect_ratio = av_d2q(1.0 / ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1319 avctx->ticks_per_frame = 1;
1320 } else { // MPEG-2
1321 // MPEG-2 fps
1322 av_reduce(&s->avctx->framerate.num,
1323 &s->avctx->framerate.den,
1324 ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1325 ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1326 1 << 30);
1327 avctx->ticks_per_frame = 2;
1328 // MPEG-2 aspect
1329 if (s->aspect_ratio_info > 1) {
1330 AVRational dar =
1331 av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1332 (AVRational) { s1->pan_scan.width,
1333 s1->pan_scan.height }),
1334 (AVRational) { s->width, s->height });
1335
1336 /* We ignore the spec here and guess a bit as reality does not
1337 * match the spec, see for example res_change_ffmpeg_aspect.ts
1338 * and sequence-display-aspect.mpg.
1339 * issue1613, 621, 562 */
1340 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1341 (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1342 av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1343 s->avctx->sample_aspect_ratio =
1344 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1345 (AVRational) { s->width, s->height });
1346 } else {
1347 s->avctx->sample_aspect_ratio =
1348 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1349 (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1350 // issue1613 4/3 16/9 -> 16/9
1351 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1352 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1353 // s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1354 av_dlog(avctx, "A %d/%d\n",
1355 ff_mpeg2_aspect[s->aspect_ratio_info].num,
1356 ff_mpeg2_aspect[s->aspect_ratio_info].den);
1357 av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1358 s->avctx->sample_aspect_ratio.den);
1359 }
1360 } else {
1361 s->avctx->sample_aspect_ratio =
1362 ff_mpeg2_aspect[s->aspect_ratio_info];
1363 }
1364 } // MPEG-2
1365
1366 ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
1367
1368 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1369 setup_hwaccel_for_pixfmt(avctx);
1370
1371 /* Quantization matrices may need reordering
1372 * if DCT permutation is changed. */
1373 memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1374
1375 ff_mpv_idct_init(s);
1376 if (ff_mpv_common_init(s) < 0)
1377 return -2;
1378
1379 quant_matrix_rebuild(s->intra_matrix, old_permutation, s->idsp.idct_permutation);
1380 quant_matrix_rebuild(s->inter_matrix, old_permutation, s->idsp.idct_permutation);
1381 quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1382 quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1383
1384 s1->mpeg_enc_ctx_allocated = 1;
1385 }
1386 return 0;
1387 }
1388
1389 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1390 int buf_size)
1391 {
1392 Mpeg1Context *s1 = avctx->priv_data;
1393 MpegEncContext *s = &s1->mpeg_enc_ctx;
1394 int ref, f_code, vbv_delay;
1395
1396 init_get_bits(&s->gb, buf, buf_size * 8);
1397
1398 ref = get_bits(&s->gb, 10); /* temporal ref */
1399 s->pict_type = get_bits(&s->gb, 3);
1400 if (s->pict_type == 0 || s->pict_type > 3)
1401 return AVERROR_INVALIDDATA;
1402
1403 vbv_delay = get_bits(&s->gb, 16);
1404 s->vbv_delay = vbv_delay;
1405 if (s->pict_type == AV_PICTURE_TYPE_P ||
1406 s->pict_type == AV_PICTURE_TYPE_B) {
1407 s->full_pel[0] = get_bits1(&s->gb);
1408 f_code = get_bits(&s->gb, 3);
1409 if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1410 return AVERROR_INVALIDDATA;
1411 f_code += !f_code;
1412 s->mpeg_f_code[0][0] = f_code;
1413 s->mpeg_f_code[0][1] = f_code;
1414 }
1415 if (s->pict_type == AV_PICTURE_TYPE_B) {
1416 s->full_pel[1] = get_bits1(&s->gb);
1417 f_code = get_bits(&s->gb, 3);
1418 if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1419 return AVERROR_INVALIDDATA;
1420 f_code += !f_code;
1421 s->mpeg_f_code[1][0] = f_code;
1422 s->mpeg_f_code[1][1] = f_code;
1423 }
1424 s->current_picture.f->pict_type = s->pict_type;
1425 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1426
1427 if (avctx->debug & FF_DEBUG_PICT_INFO)
1428 av_log(avctx, AV_LOG_DEBUG,
1429 "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1430
1431 s->y_dc_scale = 8;
1432 s->c_dc_scale = 8;
1433 return 0;
1434 }
1435
1436 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1437 {
1438 MpegEncContext *s = &s1->mpeg_enc_ctx;
1439 int horiz_size_ext, vert_size_ext;
1440 int bit_rate_ext;
1441
1442 skip_bits(&s->gb, 1); /* profile and level esc*/
1443 s->avctx->profile = get_bits(&s->gb, 3);
1444 s->avctx->level = get_bits(&s->gb, 4);
1445 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1446 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1447 horiz_size_ext = get_bits(&s->gb, 2);
1448 vert_size_ext = get_bits(&s->gb, 2);
1449 s->width |= (horiz_size_ext << 12);
1450 s->height |= (vert_size_ext << 12);
1451 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1452 s->bit_rate += (bit_rate_ext << 18) * 400;
1453 skip_bits1(&s->gb); /* marker */
1454 s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1455
1456 s->low_delay = get_bits1(&s->gb);
1457 if (s->flags & CODEC_FLAG_LOW_DELAY)
1458 s->low_delay = 1;
1459
1460 s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1461 s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1462
1463 av_dlog(s->avctx, "sequence extension\n");
1464 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1465
1466 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1467 av_log(s->avctx, AV_LOG_DEBUG,
1468 "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%d\n",
1469 s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1470 s->avctx->rc_buffer_size, s->bit_rate);
1471 }
1472
1473 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1474 {
1475 MpegEncContext *s = &s1->mpeg_enc_ctx;
1476 int color_description, w, h;
1477
1478 skip_bits(&s->gb, 3); /* video format */
1479 color_description = get_bits1(&s->gb);
1480 if (color_description) {
1481 s->avctx->color_primaries = get_bits(&s->gb, 8);
1482 s->avctx->color_trc = get_bits(&s->gb, 8);
1483 s->avctx->colorspace = get_bits(&s->gb, 8);
1484 }
1485 w = get_bits(&s->gb, 14);
1486 skip_bits(&s->gb, 1); // marker
1487 h = get_bits(&s->gb, 14);
1488 // remaining 3 bits are zero padding
1489
1490 s1->pan_scan.width = 16 * w;
1491 s1->pan_scan.height = 16 * h;
1492
1493 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1494 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1495 }
1496
1497 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1498 {
1499 MpegEncContext *s = &s1->mpeg_enc_ctx;
1500 int i, nofco;
1501
1502 nofco = 1;
1503 if (s->progressive_sequence) {
1504 if (s->repeat_first_field) {
1505 nofco++;
1506 if (s->top_field_first)
1507 nofco++;
1508 }
1509 } else {
1510 if (s->picture_structure == PICT_FRAME) {
1511 nofco++;
1512 if (s->repeat_first_field)
1513 nofco++;
1514 }
1515 }
1516 for (i = 0; i < nofco; i++) {
1517 s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1518 skip_bits(&s->gb, 1); // marker
1519 s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1520 skip_bits(&s->gb, 1); // marker
1521 }
1522
1523 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1524 av_log(s->avctx, AV_LOG_DEBUG,
1525 "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1526 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1527 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1528 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1529 }
1530
1531 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1532 uint16_t matrix1[64], int intra)
1533 {
1534 int i;
1535
1536 for (i = 0; i < 64; i++) {
1537 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1538 int v = get_bits(&s->gb, 8);
1539 if (v == 0) {
1540 av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1541 return AVERROR_INVALIDDATA;
1542 }
1543 if (intra && i == 0 && v != 8) {
1544 av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1545 v = 8; // needed by pink.mpg / issue1046
1546 }
1547 matrix0[j] = v;
1548 if (matrix1)
1549 matrix1[j] = v;
1550 }
1551 return 0;
1552 }
1553
1554 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1555 {
1556 av_dlog(s->avctx, "matrix extension\n");
1557
1558 if (get_bits1(&s->gb))
1559 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1560 if (get_bits1(&s->gb))
1561 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1562 if (get_bits1(&s->gb))
1563 load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1564 if (get_bits1(&s->gb))
1565 load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1566 }
1567
1568 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1569 {
1570 MpegEncContext *s = &s1->mpeg_enc_ctx;
1571
1572 s->full_pel[0] = s->full_pel[1] = 0;
1573 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1574 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1575 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1576 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1577 if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1578 av_log(s->avctx, AV_LOG_ERROR,
1579 "Missing picture start code, guessing missing values\n");
1580 if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1581 if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1582 s->pict_type = AV_PICTURE_TYPE_I;
1583 else
1584 s->pict_type = AV_PICTURE_TYPE_P;
1585 } else
1586 s->pict_type = AV_PICTURE_TYPE_B;
1587 s->current_picture.f->pict_type = s->pict_type;
1588 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1589 }
1590 s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1591 s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1592 s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1593 s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1594
1595 s->intra_dc_precision = get_bits(&s->gb, 2);
1596 s->picture_structure = get_bits(&s->gb, 2);
1597 s->top_field_first = get_bits1(&s->gb);
1598 s->frame_pred_frame_dct = get_bits1(&s->gb);
1599 s->concealment_motion_vectors = get_bits1(&s->gb);
1600 s->q_scale_type = get_bits1(&s->gb);
1601 s->intra_vlc_format = get_bits1(&s->gb);
1602 s->alternate_scan = get_bits1(&s->gb);
1603 s->repeat_first_field = get_bits1(&s->gb);
1604 s->chroma_420_type = get_bits1(&s->gb);
1605 s->progressive_frame = get_bits1(&s->gb);
1606
1607 if (s->alternate_scan) {
1608 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1609 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1610 } else {
1611 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1612 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1613 }
1614
1615 /* composite display not parsed */
1616 av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1617 av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1618 av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1619 av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1620 av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1621 av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1622 av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1623 av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1624 av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1625 }
1626
1627 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1628 {
1629 AVCodecContext *avctx = s->avctx;
1630 Mpeg1Context *s1 = (Mpeg1Context *) s;
1631 int ret;
1632
1633 /* start frame decoding */
1634 if (s->first_field || s->picture_structure == PICT_FRAME) {
1635 AVFrameSideData *pan_scan;
1636
1637 if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1638 return ret;
1639
1640 ff_mpeg_er_frame_start(s);
1641
1642 /* first check if we must repeat the frame */
1643 s->current_picture_ptr->f->repeat_pict = 0;
1644 if (s->repeat_first_field) {
1645 if (s->progressive_sequence) {
1646 if (s->top_field_first)
1647 s->current_picture_ptr->f->repeat_pict = 4;
1648 else
1649 s->current_picture_ptr->f->repeat_pict = 2;
1650 } else if (s->progressive_frame) {
1651 s->current_picture_ptr->f->repeat_pict = 1;
1652 }
1653 }
1654
1655 pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1656 AV_FRAME_DATA_PANSCAN,
1657 sizeof(s1->pan_scan));
1658 if (!pan_scan)
1659 return AVERROR(ENOMEM);
1660 memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1661
1662 if (s1->a53_caption) {
1663 AVFrameSideData *sd = av_frame_new_side_data(
1664 s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1665 s1->a53_caption_size);
1666 if (sd)
1667 memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1668 av_freep(&s1->a53_caption);
1669 }
1670
1671 if (s1->has_stereo3d) {
1672 AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1673 if (!stereo)
1674 return AVERROR(ENOMEM);
1675
1676 *stereo = s1->stereo3d;
1677 s1->has_stereo3d = 0;
1678 }
1679
1680 if (s1->has_afd) {
1681 AVFrameSideData *sd =
1682 av_frame_new_side_data(s->current_picture_ptr->f,
1683 AV_FRAME_DATA_AFD, 1);
1684 if (!sd)
1685 return AVERROR(ENOMEM);
1686
1687 *sd->data = s1->afd;
1688 s1->has_afd = 0;
1689 }
1690
1691 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1692 ff_thread_finish_setup(avctx);
1693 } else { // second field
1694 int i;
1695
1696 if (!s->current_picture_ptr) {
1697 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1698 return -1;
1699 }
1700
1701 if (s->avctx->hwaccel &&
1702 (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1703 if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1704 av_log(avctx, AV_LOG_ERROR,
1705 "hardware accelerator failed to decode first field\n");
1706 }
1707
1708 for (i = 0; i < 4; i++) {
1709 s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1710 if (s->picture_structure == PICT_BOTTOM_FIELD)
1711 s->current_picture.f->data[i] +=
1712 s->current_picture_ptr->f->linesize[i];
1713 }
1714 }
1715
1716 if (avctx->hwaccel) {
1717 if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1718 return ret;
1719 }
1720
1721 return 0;
1722 }
1723
1724 #define DECODE_SLICE_ERROR -1
1725 #define DECODE_SLICE_OK 0
1726
1727 /**
1728 * Decode a slice.
1729 * MpegEncContext.mb_y must be set to the MB row from the startcode.
1730 * @return DECODE_SLICE_ERROR if the slice is damaged,
1731 * DECODE_SLICE_OK if this slice is OK
1732 */
1733 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1734 const uint8_t **buf, int buf_size)
1735 {
1736 AVCodecContext *avctx = s->avctx;
1737 const int lowres = s->avctx->lowres;
1738 const int field_pic = s->picture_structure != PICT_FRAME;
1739 int ret;
1740
1741 s->resync_mb_x =
1742 s->resync_mb_y = -1;
1743
1744 av_assert0(mb_y < s->mb_height);
1745
1746 init_get_bits(&s->gb, *buf, buf_size * 8);
1747 if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1748 skip_bits(&s->gb, 3);
1749
1750 ff_mpeg1_clean_buffers(s);
1751 s->interlaced_dct = 0;
1752
1753 s->qscale = get_qscale(s);
1754
1755 if (s->qscale == 0) {
1756 av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1757 return AVERROR_INVALIDDATA;
1758 }
1759
1760 /* extra slice info */
1761 if (skip_1stop_8data_bits(&s->gb) < 0)
1762 return AVERROR_INVALIDDATA;
1763
1764 s->mb_x = 0;
1765
1766 if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1767 skip_bits1(&s->gb);
1768 } else {
1769 while (get_bits_left(&s->gb) > 0) {
1770 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1771 MBINCR_VLC_BITS, 2);
1772 if (code < 0) {
1773 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1774 return AVERROR_INVALIDDATA;
1775 }
1776 if (code >= 33) {
1777 if (code == 33)
1778 s->mb_x += 33;
1779 /* otherwise, stuffing, nothing to do */
1780 } else {
1781 s->mb_x += code;
1782 break;
1783 }
1784 }
1785 }
1786
1787 if (s->mb_x >= (unsigned) s->mb_width) {
1788 av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1789 return AVERROR_INVALIDDATA;
1790 }
1791
1792 if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1793 const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1794 int start_code = -1;
1795 buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1796 if (buf_end < *buf + buf_size)
1797 buf_end -= 4;
1798 s->mb_y = mb_y;
1799 if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1800 return DECODE_SLICE_ERROR;
1801 *buf = buf_end;
1802 return DECODE_SLICE_OK;
1803 }
1804
1805 s->resync_mb_x = s->mb_x;
1806 s->resync_mb_y = s->mb_y = mb_y;
1807 s->mb_skip_run = 0;
1808 ff_init_block_index(s);
1809
1810 if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1811 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1812 av_log(s->avctx, AV_LOG_DEBUG,
1813 "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",
1814 s->qscale,
1815 s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1816 s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1817 s->pict_type == AV_PICTURE_TYPE_I ? "I" :
1818 (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1819 (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1820 s->progressive_sequence ? "ps" : "",
1821 s->progressive_frame ? "pf" : "",
1822 s->alternate_scan ? "alt" : "",
1823 s->top_field_first ? "top" : "",
1824 s->intra_dc_precision, s->picture_structure,
1825 s->frame_pred_frame_dct, s->concealment_motion_vectors,
1826 s->q_scale_type, s->intra_vlc_format,
1827 s->repeat_first_field, s->chroma_420_type ? "420" : "");
1828 }
1829 }
1830
1831 for (;;) {
1832 // If 1, we memcpy blocks in xvmcvideo.
1833 if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1834 ff_xvmc_init_block(s); // set s->block
1835
1836 if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1837 return ret;
1838
1839 // Note motion_val is normally NULL unless we want to extract the MVs.
1840 if (s->current_picture.motion_val[0] && !s->encoding) {
1841 const int wrap = s->b8_stride;
1842 int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1843 int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1844 int motion_x, motion_y, dir, i;
1845
1846 for (i = 0; i < 2; i++) {
1847 for (dir = 0; dir < 2; dir++) {
1848 if (s->mb_intra ||
1849 (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1850 motion_x = motion_y = 0;
1851 } else if (s->mv_type == MV_TYPE_16X16 ||
1852 (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1853 motion_x = s->mv[dir][0][0];
1854 motion_y = s->mv[dir][0][1];
1855 } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1856 motion_x = s->mv[dir][i][0];
1857 motion_y = s->mv[dir][i][1];
1858 }
1859
1860 s->current_picture.motion_val[dir][xy][0] = motion_x;
1861 s->current_picture.motion_val[dir][xy][1] = motion_y;
1862 s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1863 s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1864 s->current_picture.ref_index [dir][b8_xy] =
1865 s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1866 av_assert2(s->field_select[dir][i] == 0 ||
1867 s->field_select[dir][i] == 1);
1868 }
1869 xy += wrap;
1870 b8_xy += 2;
1871 }
1872 }
1873
1874 s->dest[0] += 16 >> lowres;
1875 s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1876 s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1877
1878 ff_mpv_decode_mb(s, s->block);
1879
1880 if (++s->mb_x >= s->mb_width) {
1881 const int mb_size = 16 >> s->avctx->lowres;
1882
1883 ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1884 ff_mpv_report_decode_progress(s);
1885
1886 s->mb_x = 0;
1887 s->mb_y += 1 << field_pic;
1888
1889 if (s->mb_y >= s->mb_height) {
1890 int left = get_bits_left(&s->gb);
1891 int is_d10 = s->chroma_format == 2 &&
1892 s->pict_type == AV_PICTURE_TYPE_I &&
1893 avctx->profile == 0 && avctx->level == 5 &&
1894 s->intra_dc_precision == 2 &&
1895 s->q_scale_type == 1 && s->alternate_scan == 0 &&
1896 s->progressive_frame == 0
1897 /* vbv_delay == 0xBBB || 0xE10 */;
1898
1899 if (left >= 32 && !is_d10) {
1900 GetBitContext gb = s->gb;
1901 align_get_bits(&gb);
1902 if (show_bits(&gb, 24) == 0x060E2B) {
1903 av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1904 is_d10 = 1;
1905 }
1906 }
1907
1908 if (left < 0 ||
1909 (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1910 ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1911 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
1912 left, show_bits(&s->gb, FFMIN(left, 23)));
1913 return -1;
1914 } else
1915 goto eos;
1916 }
1917 // There are some files out there which are missing the last slice
1918 // in cases where the slice is completely outside the visible
1919 // area, we detect this here instead of running into the end expecting
1920 // more data
1921 if (s->mb_y >= ((s->height + 15) >> 4) &&
1922 s->progressive_frame &&
1923 !s->progressive_sequence &&
1924 get_bits_left(&s->gb) <= 8 &&
1925 get_bits_left(&s->gb) >= 0 &&
1926 s->mb_skip_run == -1 &&
1927 show_bits(&s->gb, 8) == 0)
1928 goto eos;
1929
1930 ff_init_block_index(s);
1931 }
1932
1933 /* skip mb handling */
1934 if (s->mb_skip_run == -1) {
1935 /* read increment again */
1936 s->mb_skip_run = 0;
1937 for (;;) {
1938 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1939 MBINCR_VLC_BITS, 2);
1940 if (code < 0) {
1941 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1942 return AVERROR_INVALIDDATA;
1943 }
1944 if (code >= 33) {
1945 if (code == 33) {
1946 s->mb_skip_run += 33;
1947 } else if (code == 35) {
1948 if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1949 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1950 return -1;
1951 }
1952 goto eos; /* end of slice */
1953 }
1954 /* otherwise, stuffing, nothing to do */
1955 } else {
1956 s->mb_skip_run += code;
1957 break;
1958 }
1959 }
1960 if (s->mb_skip_run) {
1961 int i;
1962 if (s->pict_type == AV_PICTURE_TYPE_I) {
1963 av_log(s->avctx, AV_LOG_ERROR,
1964 "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1965 return AVERROR_INVALIDDATA;
1966 }
1967
1968 /* skip mb */
1969 s->mb_intra = 0;
1970 for (i = 0; i < 12; i++)
1971 s->block_last_index[i] = -1;
1972 if (s->picture_structure == PICT_FRAME)
1973 s->mv_type = MV_TYPE_16X16;
1974 else
1975 s->mv_type = MV_TYPE_FIELD;
1976 if (s->pict_type == AV_PICTURE_TYPE_P) {
1977 /* if P type, zero motion vector is implied */
1978 s->mv_dir = MV_DIR_FORWARD;
1979 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1980 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1981 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1982 s->field_select[0][0] = (s->picture_structure - 1) & 1;
1983 } else {
1984 /* if B type, reuse previous vectors and directions */
1985 s->mv[0][0][0] = s->last_mv[0][0][0];
1986 s->mv[0][0][1] = s->last_mv[0][0][1];
1987 s->mv[1][0][0] = s->last_mv[1][0][0];
1988 s->mv[1][0][1] = s->last_mv[1][0][1];
1989 }
1990 }
1991 }
1992 }
1993 eos: // end of slice
1994 if (get_bits_left(&s->gb) < 0) {
1995 av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1996 return AVERROR_INVALIDDATA;
1997 }
1998 *buf += (get_bits_count(&s->gb) - 1) / 8;
1999 av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2000 return 0;
2001 }
2002
2003 static int slice_decode_thread(AVCodecContext *c, void *arg)
2004 {
2005 MpegEncContext *s = *(void **) arg;
2006 const uint8_t *buf = s->gb.buffer;
2007 int mb_y = s->start_mb_y;
2008 const int field_pic = s->picture_structure != PICT_FRAME;
2009
2010 s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
2011
2012 for (;;) {
2013 uint32_t start_code;
2014 int ret;
2015
2016 ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
2017 emms_c();
2018 av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2019 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
2020 s->start_mb_y, s->end_mb_y, s->er.error_count);
2021 if (ret < 0) {
2022 if (c->err_recognition & AV_EF_EXPLODE)
2023 return ret;
2024 if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2025 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2026 s->mb_x, s->mb_y,
2027 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2028 } else {
2029 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2030 s->mb_x - 1, s->mb_y,
2031 ER_AC_END | ER_DC_END | ER_MV_END);
2032 }
2033
2034 if (s->mb_y == s->end_mb_y)
2035 return 0;
2036
2037 start_code = -1;
2038 buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2039 mb_y = start_code - SLICE_MIN_START_CODE;
2040 if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2041 mb_y += (*buf&0xE0)<<2;
2042 mb_y <<= field_pic;
2043 if (s->picture_structure == PICT_BOTTOM_FIELD)
2044 mb_y++;
2045 if (mb_y < 0 || mb_y >= s->end_mb_y)
2046 return -1;
2047 }
2048 }
2049
2050 /**
2051 * Handle slice ends.
2052 * @return 1 if it seems to be the last slice
2053 */
2054 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2055 {
2056 Mpeg1Context *s1 = avctx->priv_data;
2057 MpegEncContext *s = &s1->mpeg_enc_ctx;
2058
2059 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2060 return 0;
2061
2062 if (s->avctx->hwaccel) {
2063 if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
2064 av_log(avctx, AV_LOG_ERROR,
2065 "hardware accelerator failed to decode picture\n");
2066 }
2067
2068 /* end of slice reached */
2069 if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2070 /* end of image */
2071
2072 ff_er_frame_end(&s->er);
2073
2074 ff_mpv_frame_end(s);
2075
2076 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2077 int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2078 if (ret < 0)
2079 return ret;
2080 ff_print_debug_info(s, s->current_picture_ptr, pict);
2081 ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2082 } else {
2083 if (avctx->active_thread_type & FF_THREAD_FRAME)
2084 s->picture_number++;
2085 /* latency of 1 frame for I- and P-frames */
2086 /* XXX: use another variable than picture_number */
2087 if (s->last_picture_ptr) {
2088 int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2089 if (ret < 0)
2090 return ret;
2091 ff_print_debug_info(s, s->last_picture_ptr, pict);
2092 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2093 }
2094 }
2095
2096 return 1;
2097 } else {
2098 return 0;
2099 }
2100 }
2101
2102 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2103 const uint8_t *buf, int buf_size)
2104 {
2105 Mpeg1Context *s1 = avctx->priv_data;
2106 MpegEncContext *s = &s1->mpeg_enc_ctx;
2107 int width, height;
2108 int i, v, j;
2109
2110 init_get_bits(&s->gb, buf, buf_size * 8);
2111
2112 width = get_bits(&s->gb, 12);
2113 height = get_bits(&s->gb, 12);
2114 if (width == 0 || height == 0) {
2115 av_log(avctx, AV_LOG_WARNING,
2116 "Invalid horizontal or vertical size value.\n");
2117 if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2118 return AVERROR_INVALIDDATA;
2119 }
2120 s->aspect_ratio_info = get_bits(&s->gb, 4);
2121 if (s->aspect_ratio_info == 0) {
2122 av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2123 if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2124 return AVERROR_INVALIDDATA;
2125 }
2126 s->frame_rate_index = get_bits(&s->gb, 4);
2127 if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2128 av_log(avctx, AV_LOG_WARNING, "frame_rate_index %d is invalid\n", s->frame_rate_index);
2129 s->frame_rate_index = 1;
2130 }
2131 s->bit_rate = get_bits(&s->gb, 18) * 400;
2132 if (get_bits1(&s->gb) == 0) { /* marker */
2133 av_log(avctx, AV_LOG_ERROR, "Marker in sequence header missing\n");
2134 return AVERROR_INVALIDDATA;
2135 }
2136 s->width = width;
2137 s->height = height;
2138
2139 s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2140 skip_bits(&s->gb, 1);
2141
2142 /* get matrix */
2143 if (get_bits1(&s->gb)) {
2144 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2145 } else {
2146 for (i = 0; i < 64; i++) {
2147 j = s->idsp.idct_permutation[i];
2148 v = ff_mpeg1_default_intra_matrix[i];
2149 s->intra_matrix[j] = v;
2150 s->chroma_intra_matrix[j] = v;
2151 }
2152 }
2153 if (get_bits1(&s->gb)) {
2154 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2155 } else {
2156 for (i = 0; i < 64; i++) {
2157 int j = s->idsp.idct_permutation[i];
2158 v = ff_mpeg1_default_non_intra_matrix[i];
2159 s->inter_matrix[j] = v;
2160 s->chroma_inter_matrix[j] = v;
2161 }
2162 }
2163
2164 if (show_bits(&s->gb, 23) != 0) {
2165 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2166 return AVERROR_INVALIDDATA;
2167 }
2168
2169 /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2170 s->progressive_sequence = 1;
2171 s->progressive_frame = 1;
2172 s->picture_structure = PICT_FRAME;
2173 s->first_field = 0;
2174 s->frame_pred_frame_dct = 1;
2175 s->chroma_format = 1;
2176 s->codec_id =
2177 s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2178 s->out_format = FMT_MPEG1;
2179 s->swap_uv = 0; // AFAIK VCR2 does not have SEQ_HEADER
2180 if (s->flags & CODEC_FLAG_LOW_DELAY)
2181 s->low_delay = 1;
2182
2183 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2184 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d, aspect_ratio_info: %d \n",
2185 s->avctx->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2186
2187 return 0;
2188 }
2189
2190 static int vcr2_init_sequence(AVCodecContext *avctx)
2191 {
2192 Mpeg1Context *s1 = avctx->priv_data;
2193 MpegEncContext *s = &s1->mpeg_enc_ctx;
2194 int i, v;
2195 int ret;
2196
2197 /* start new MPEG-1 context decoding */
2198 s->out_format = FMT_MPEG1;
2199 if (s1->mpeg_enc_ctx_allocated) {
2200 ff_mpv_common_end(s);
2201 s1->mpeg_enc_ctx_allocated = 0;
2202 }
2203 s->width = avctx->coded_width;
2204 s->height = avctx->coded_height;
2205 avctx->has_b_frames = 0; // true?
2206 s->low_delay = 1;
2207
2208 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2209 setup_hwaccel_for_pixfmt(avctx);
2210
2211 ff_mpv_idct_init(s);
2212 if ((ret = ff_mpv_common_init(s)) < 0)
2213 return ret;
2214 s1->mpeg_enc_ctx_allocated = 1;
2215
2216 for (i = 0; i < 64; i++) {
2217 int j = s->idsp.idct_permutation[i];
2218 v = ff_mpeg1_default_intra_matrix[i];
2219 s->intra_matrix[j] = v;
2220 s->chroma_intra_matrix[j] = v;
2221
2222 v = ff_mpeg1_default_non_intra_matrix[i];
2223 s->inter_matrix[j] = v;
2224 s->chroma_inter_matrix[j] = v;
2225 }
2226
2227 s->progressive_sequence = 1;
2228 s->progressive_frame = 1;
2229 s->picture_structure = PICT_FRAME;
2230 s->first_field = 0;
2231 s->frame_pred_frame_dct = 1;
2232 s->chroma_format = 1;
2233 if (s->codec_tag == AV_RL32("BW10")) {
2234 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2235 } else {
2236 s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2237 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2238 }
2239 s1->save_width = s->width;
2240 s1->save_height = s->height;
2241 s1->save_progressive_seq = s->progressive_sequence;
2242 return 0;
2243 }
2244
2245 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2246 const uint8_t *p, int buf_size)
2247 {
2248 Mpeg1Context *s1 = avctx->priv_data;
2249
2250 if (buf_size >= 6 &&
2251 p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2252 p[4] == 3 && (p[5] & 0x40)) {
2253 /* extract A53 Part 4 CC data */
2254 int cc_count = p[5] & 0x1f;
2255 if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2256 av_freep(&s1->a53_caption);
2257 s1->a53_caption_size = cc_count * 3;
2258 s1->a53_caption = av_malloc(s1->a53_caption_size);
2259 if (s1->a53_caption)
2260 memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2261 }
2262 return 1;
2263 } else if (buf_size >= 11 &&
2264 p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2265 /* extract DVD CC data */
2266 int cc_count = 0;
2267 int i;
2268 // There is a caption count field in the data, but it is often
2269 // incorect. So count the number of captions present.
2270 for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2271 cc_count++;
2272 // Transform the DVD format into A53 Part 4 format
2273 if (cc_count > 0) {
2274 av_freep(&s1->a53_caption);
2275 s1->a53_caption_size = cc_count * 6;
2276 s1->a53_caption = av_malloc(s1->a53_caption_size);
2277 if (s1->a53_caption) {
2278 uint8_t field1 = !!(p[4] & 0x80);
2279 uint8_t *cap = s1->a53_caption;
2280 p += 5;
2281 for (i = 0; i < cc_count; i++) {
2282 cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2283 cap[1] = p[1];
2284 cap[2] = p[2];
2285 cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2286 cap[4] = p[4];
2287 cap[5] = p[5];
2288 cap += 6;
2289 p += 6;
2290 }
2291 }
2292 }
2293 return 1;
2294 }
2295 return 0;
2296 }
2297
2298 static void mpeg_decode_user_data(AVCodecContext *avctx,
2299 const uint8_t *p, int buf_size)
2300 {
2301 Mpeg1Context *s = avctx->priv_data;
2302 const uint8_t *buf_end = p + buf_size;
2303 Mpeg1Context *s1 = avctx->priv_data;
2304
2305 if (buf_size > 29){
2306 int i;
2307 for(i=0; i<20; i++)
2308 if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2309 s->tmpgexs= 1;
2310 }
2311
2312 /* for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2313 av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2314 }
2315 av_log(avctx, AV_LOG_ERROR, "\n");*/
2316 }
2317
2318 /* we parse the DTG active format information */
2319 if (buf_end - p >= 5 &&
2320 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2321 int flags = p[4];
2322 p += 5;
2323 if (flags & 0x80) {
2324 /* skip event id */
2325 p += 2;
2326 }
2327 if (flags & 0x40) {
2328 if (buf_end - p < 1)
2329 return;
2330 #if FF_API_AFD
2331 FF_DISABLE_DEPRECATION_WARNINGS
2332 avctx->dtg_active_format = p[0] & 0x0f;
2333 FF_ENABLE_DEPRECATION_WARNINGS
2334 #endif /* FF_API_AFD */
2335 s1->has_afd = 1;
2336 s1->afd = p[0] & 0x0f;
2337 }
2338 } else if (buf_end - p >= 6 &&
2339 p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2340 p[4] == 0x03) { // S3D_video_format_length
2341 // the 0x7F mask ignores the reserved_bit value
2342 const uint8_t S3D_video_format_type = p[5] & 0x7F;
2343
2344 if (S3D_video_format_type == 0x03 ||
2345 S3D_video_format_type == 0x04 ||
2346 S3D_video_format_type == 0x08 ||
2347 S3D_video_format_type == 0x23) {
2348
2349 s1->has_stereo3d = 1;
2350
2351 switch (S3D_video_format_type) {
2352 case 0x03:
2353 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2354 break;
2355 case 0x04:
2356 s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2357 break;
2358 case 0x08:
2359 s1->stereo3d.type = AV_STEREO3D_2D;
2360 break;
2361 case 0x23:
2362 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2363 break;
2364 }
2365 }
2366 } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2367 return;
2368 }
2369 }
2370
2371 static void mpeg_decode_gop(AVCodecContext *avctx,
2372 const uint8_t *buf, int buf_size)
2373 {
2374 Mpeg1Context *s1 = avctx->priv_data;
2375 MpegEncContext *s = &s1->mpeg_enc_ctx;
2376 int broken_link;
2377 int64_t tc;
2378
2379 init_get_bits(&s->gb, buf, buf_size * 8);
2380
2381 tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2382
2383 s->closed_gop = get_bits1(&s->gb);
2384 /* broken_link indicate that after editing the
2385 * reference frames of the first B-Frames after GOP I-Frame
2386 * are missing (open gop) */
2387 broken_link = get_bits1(&s->gb);
2388
2389 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2390 char tcbuf[AV_TIMECODE_STR_SIZE];
2391 av_timecode_make_mpeg_tc_string(tcbuf, tc);
2392 av_log(s->avctx, AV_LOG_DEBUG,
2393 "GOP (%s) closed_gop=%d broken_link=%d\n",
2394 tcbuf, s->closed_gop, broken_link);
2395 }
2396 }
2397
2398 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2399 int *got_output, const uint8_t *buf, int buf_size)
2400 {
2401 Mpeg1Context *s = avctx->priv_data;
2402 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2403 const uint8_t *buf_ptr = buf;
2404 const uint8_t *buf_end = buf + buf_size;
2405 int ret, input_size;
2406 int last_code = 0, skip_frame = 0;
2407 int picture_start_code_seen = 0;
2408
2409 for (;;) {
2410 /* find next start code */
2411 uint32_t start_code = -1;
2412 buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2413 if (start_code > 0x1ff) {
2414 if (!skip_frame) {
2415 if (HAVE_THREADS &&
2416 (avctx->active_thread_type & FF_THREAD_SLICE) &&
2417 !avctx->hwaccel) {
2418 int i;
2419 av_assert0(avctx->thread_count > 1);
2420
2421 avctx->execute(avctx, slice_decode_thread,
2422 &s2->thread_context[0], NULL,
2423 s->slice_count, sizeof(void *));
2424 for (i = 0; i < s->slice_count; i++)
2425 s2->er.error_count += s2->thread_context[i]->er.error_count;
2426 }
2427
2428 if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
2429 && uses_vdpau(avctx))
2430 ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2431
2432 ret = slice_end(avctx, picture);
2433 if (ret < 0)
2434 return ret;
2435 else if (ret) {
2436 // FIXME: merge with the stuff in mpeg_decode_slice
2437 if (s2->last_picture_ptr || s2->low_delay)
2438 *got_output = 1;
2439 }
2440 }
2441 s2->pict_type = 0;
2442
2443 if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2444 return AVERROR_INVALIDDATA;
2445
2446 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2447 }
2448
2449 input_size = buf_end - buf_ptr;
2450
2451 if (avctx->debug & FF_DEBUG_STARTCODE)
2452 av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2453 start_code, buf_ptr - buf, input_size);
2454
2455 /* prepare data for next start code */
2456 switch (start_code) {
2457 case SEQ_START_CODE:
2458 if (last_code == 0) {
2459 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2460 if (buf != avctx->extradata)
2461 s->sync = 1;
2462 } else {
2463 av_log(avctx, AV_LOG_ERROR,
2464 "ignoring SEQ_START_CODE after %X\n", last_code);
2465 if (avctx->err_recognition & AV_EF_EXPLODE)
2466 return AVERROR_INVALIDDATA;
2467 }
2468 break;
2469
2470 case PICTURE_START_CODE:
2471 if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2472 /* If it's a frame picture, there can't be more than one picture header.
2473 Yet, it does happen and we need to handle it. */
2474 av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2475 break;
2476 }
2477 picture_start_code_seen = 1;
2478
2479 if (s2->width <= 0 || s2->height <= 0) {
2480 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2481 s2->width, s2->height);
2482 return AVERROR_INVALIDDATA;
2483 }
2484
2485 if (s->tmpgexs){
2486 s2->intra_dc_precision= 3;
2487 s2->intra_matrix[0]= 1;
2488 }
2489 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2490 !avctx->hwaccel && s->slice_count) {
2491 int i;
2492
2493 avctx->execute(avctx, slice_decode_thread,
2494 s2->thread_context, NULL,
2495 s->slice_count, sizeof(void *));
2496 for (i = 0; i < s->slice_count; i++)
2497 s2->er.error_count += s2->thread_context[i]->er.error_count;
2498 s->slice_count = 0;
2499 }
2500 if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2501 ret = mpeg_decode_postinit(avctx);
2502 if (ret < 0) {
2503 av_log(avctx, AV_LOG_ERROR,
2504 "mpeg_decode_postinit() failure\n");
2505 return ret;
2506 }
2507
2508 /* We have a complete image: we try to decompress it. */
2509 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2510 s2->pict_type = 0;
2511 s->first_slice = 1;
2512 last_code = PICTURE_START_CODE;
2513 } else {
2514 av_log(avctx, AV_LOG_ERROR,
2515 "ignoring pic after %X\n", last_code);
2516 if (avctx->err_recognition & AV_EF_EXPLODE)
2517 return AVERROR_INVALIDDATA;
2518 }
2519 break;
2520 case EXT_START_CODE:
2521 init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2522
2523 switch (get_bits(&s2->gb, 4)) {
2524 case 0x1:
2525 if (last_code == 0) {
2526 mpeg_decode_sequence_extension(s);
2527 } else {
2528 av_log(avctx, AV_LOG_ERROR,
2529 "ignoring seq ext after %X\n", last_code);
2530 if (avctx->err_recognition & AV_EF_EXPLODE)
2531 return AVERROR_INVALIDDATA;
2532 }
2533 break;
2534 case 0x2:
2535 mpeg_decode_sequence_display_extension(s);
2536 break;
2537 case 0x3:
2538 mpeg_decode_quant_matrix_extension(s2);
2539 break;
2540 case 0x7:
2541 mpeg_decode_picture_display_extension(s);
2542 break;
2543 case 0x8:
2544 if (last_code == PICTURE_START_CODE) {
2545 mpeg_decode_picture_coding_extension(s);
2546 } else {
2547 av_log(avctx, AV_LOG_ERROR,
2548 "ignoring pic cod ext after %X\n", last_code);
2549 if (avctx->err_recognition & AV_EF_EXPLODE)
2550 return AVERROR_INVALIDDATA;
2551 }
2552 break;
2553 }
2554 break;
2555 case USER_START_CODE:
2556 mpeg_decode_user_data(avctx, buf_ptr, input_size);
2557 break;
2558 case GOP_START_CODE:
2559 if (last_code == 0) {
2560 s2->first_field = 0;
2561 mpeg_decode_gop(avctx, buf_ptr, input_size);
2562 s->sync = 1;
2563 } else {
2564 av_log(avctx, AV_LOG_ERROR,
2565 "ignoring GOP_START_CODE after %X\n", last_code);
2566 if (avctx->err_recognition & AV_EF_EXPLODE)
2567 return AVERROR_INVALIDDATA;
2568 }
2569 break;
2570 default:
2571 if (start_code >= SLICE_MIN_START_CODE &&
2572 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2573 if (s2->progressive_sequence && !s2->progressive_frame) {
2574 s2->progressive_frame = 1;
2575 av_log(s2->avctx, AV_LOG_ERROR,
2576 "interlaced frame in progressive sequence, ignoring\n");
2577 }
2578
2579 if (s2->picture_structure == 0 ||
2580 (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2581 av_log(s2->avctx, AV_LOG_ERROR,
2582 "picture_structure %d invalid, ignoring\n",
2583 s2->picture_structure);
2584 s2->picture_structure = PICT_FRAME;
2585 }
2586
2587 if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2588 av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2589
2590 if (s2->picture_structure == PICT_FRAME) {
2591 s2->first_field = 0;
2592 s2->v_edge_pos = 16 * s2->mb_height;
2593 } else {
2594 s2->first_field ^= 1;
2595 s2->v_edge_pos = 8 * s2->mb_height;
2596 memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2597 }
2598 }
2599 if (start_code >= SLICE_MIN_START_CODE &&
2600 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2601 const int field_pic = s2->picture_structure != PICT_FRAME;
2602 int mb_y = start_code - SLICE_MIN_START_CODE;
2603 last_code = SLICE_MIN_START_CODE;
2604 if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2605 mb_y += (*buf_ptr&0xE0)<<2;
2606
2607 mb_y <<= field_pic;
2608 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2609 mb_y++;
2610
2611 if (buf_end - buf_ptr < 2) {
2612 av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2613 return AVERROR_INVALIDDATA;
2614 }
2615
2616 if (mb_y >= s2->mb_height) {
2617 av_log(s2->avctx, AV_LOG_ERROR,
2618 "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2619 return AVERROR_INVALIDDATA;
2620 }
2621
2622 if (!s2->last_picture_ptr) {
2623 /* Skip B-frames if we do not have reference frames and
2624 * GOP is not closed. */
2625 if (s2->pict_type == AV_PICTURE_TYPE_B) {
2626 if (!s2->closed_gop) {
2627 skip_frame = 1;
2628 break;
2629 }
2630 }
2631 }
2632 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
2633 s->sync = 1;
2634 if (!s2->next_picture_ptr) {
2635 /* Skip P-frames if we do not have a reference frame or
2636 * we have an invalid header. */
2637 if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2638 skip_frame = 1;
2639 break;
2640 }
2641 }
2642 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2643 s2->pict_type == AV_PICTURE_TYPE_B) ||
2644 (avctx->skip_frame >= AVDISCARD_NONKEY &&
2645 s2->pict_type != AV_PICTURE_TYPE_I) ||
2646 avctx->skip_frame >= AVDISCARD_ALL) {
2647 skip_frame = 1;
2648 break;
2649 }
2650
2651 if (!s->mpeg_enc_ctx_allocated)
2652 break;
2653
2654 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2655 if (mb_y < avctx->skip_top ||
2656 mb_y >= s2->mb_height - avctx->skip_bottom)
2657 break;
2658 }
2659
2660 if (!s2->pict_type) {
2661 av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2662 if (avctx->err_recognition & AV_EF_EXPLODE)
2663 return AVERROR_INVALIDDATA;
2664 break;
2665 }
2666
2667 if (s->first_slice) {
2668 skip_frame = 0;
2669 s->first_slice = 0;
2670 if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2671 return ret;
2672 }
2673 if (!s2->current_picture_ptr) {
2674 av_log(avctx, AV_LOG_ERROR,
2675 "current_picture not initialized\n");
2676 return AVERROR_INVALIDDATA;
2677 }
2678
2679 if (uses_vdpau(avctx)) {
2680 s->slice_count++;
2681 break;
2682 }
2683
2684 if (HAVE_THREADS &&
2685 (avctx->active_thread_type & FF_THREAD_SLICE) &&
2686 !avctx->hwaccel) {
2687 int threshold = (s2->mb_height * s->slice_count +
2688 s2->slice_context_count / 2) /
2689 s2->slice_context_count;
2690 av_assert0(avctx->thread_count > 1);
2691 if (threshold <= mb_y) {
2692 MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2693
2694 thread_context->start_mb_y = mb_y;
2695 thread_context->end_mb_y = s2->mb_height;
2696 if (s->slice_count) {
2697 s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2698 ret = ff_update_duplicate_context(thread_context, s2);
2699 if (ret < 0)
2700 return ret;
2701 }
2702 init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2703 s->slice_count++;
2704 }
2705 buf_ptr += 2; // FIXME add minimum number of bytes per slice
2706 } else {
2707 ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2708 emms_c();
2709
2710 if (ret < 0) {
2711 if (avctx->err_recognition & AV_EF_EXPLODE)
2712 return ret;
2713 if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2714 ff_er_add_slice(&s2->er, s2->resync_mb_x,
2715 s2->resync_mb_y, s2->mb_x, s2->mb_y,
2716 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2717 } else {
2718 ff_er_add_slice(&s2->er, s2->resync_mb_x,
2719 s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2720 ER_AC_END | ER_DC_END | ER_MV_END);
2721 }
2722 }
2723 }
2724 break;
2725 }
2726 }
2727 }
2728
2729 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2730 int *got_output, AVPacket *avpkt)
2731 {
2732 const uint8_t *buf = avpkt->data;
2733 int ret;
2734 int buf_size = avpkt->size;
2735 Mpeg1Context *s = avctx->priv_data;
2736 AVFrame *picture = data;
2737 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2738
2739 if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2740 /* special case for last picture */
2741 if (s2->low_delay == 0 && s2->next_picture_ptr) {
2742 int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2743 if (ret < 0)
2744 return ret;
2745
2746 s2->next_picture_ptr = NULL;
2747
2748 *got_output = 1;
2749 }
2750 return buf_size;
2751 }
2752
2753 if (s2->flags & CODEC_FLAG_TRUNCATED) {
2754 int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2755 buf_size, NULL);
2756
2757 if (ff_combine_frame(&s2->parse_context, next,
2758 (const uint8_t **) &buf, &buf_size) < 0)
2759 return buf_size;
2760 }
2761
2762 s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2763 if (s->mpeg_enc_ctx_allocated == 0 && ( s2->codec_tag == AV_RL32("VCR2")
2764 || s2->codec_tag == AV_RL32("BW10")
2765 ))
2766 vcr2_init_sequence(avctx);
2767
2768 s->slice_count = 0;
2769
2770 if (avctx->extradata && !s->extradata_decoded) {
2771 ret = decode_chunks(avctx, picture, got_output,
2772 avctx->extradata, avctx->extradata_size);
2773 if (*got_output) {
2774 av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2775 *got_output = 0;
2776 }
2777 s->extradata_decoded = 1;
2778 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2779 s2->current_picture_ptr = NULL;
2780 return ret;
2781 }
2782 }
2783
2784 ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2785 if (ret<0 || *got_output)
2786 s2->current_picture_ptr = NULL;
2787
2788 return ret;
2789 }
2790
2791 static void flush(AVCodecContext *avctx)
2792 {
2793 Mpeg1Context *s = avctx->priv_data;
2794
2795 s->sync = 0;
2796
2797 ff_mpeg_flush(avctx);
2798 }
2799
2800 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2801 {
2802 Mpeg1Context *s = avctx->priv_data;
2803
2804 if (s->mpeg_enc_ctx_allocated)
2805 ff_mpv_common_end(&s->mpeg_enc_ctx);
2806 av_freep(&s->a53_caption);
2807 return 0;
2808 }
2809
2810 static const AVProfile mpeg2_video_profiles[] = {
2811 { FF_PROFILE_MPEG2_422, "4:2:2" },
2812 { FF_PROFILE_MPEG2_HIGH, "High" },
2813 { FF_PROFILE_MPEG2_SS, "Spatially Scalable" },
2814 { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable" },
2815 { FF_PROFILE_MPEG2_MAIN, "Main" },
2816 { FF_PROFILE_MPEG2_SIMPLE, "Simple" },
2817 { FF_PROFILE_RESERVED, "Reserved" },
2818 { FF_PROFILE_RESERVED, "Reserved" },
2819 { FF_PROFILE_UNKNOWN },
2820 };
2821
2822 AVCodec ff_mpeg1video_decoder = {
2823 .name = "mpeg1video",
2824 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2825 .type = AVMEDIA_TYPE_VIDEO,
2826 .id = AV_CODEC_ID_MPEG1VIDEO,
2827 .priv_data_size = sizeof(Mpeg1Context),
2828 .init = mpeg_decode_init,
2829 .close = mpeg_decode_end,
2830 .decode = mpeg_decode_frame,
2831 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2832 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2833 CODEC_CAP_SLICE_THREADS,
2834 .flush = flush,
2835 .max_lowres = 3,
2836 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2837 };
2838
2839 AVCodec ff_mpeg2video_decoder = {
2840 .name = "mpeg2video",
2841 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2842 .type = AVMEDIA_TYPE_VIDEO,
2843 .id = AV_CODEC_ID_MPEG2VIDEO,
2844 .priv_data_size = sizeof(Mpeg1Context),
2845 .init = mpeg_decode_init,
2846 .close = mpeg_decode_end,
2847 .decode = mpeg_decode_frame,
2848 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2849 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2850 CODEC_CAP_SLICE_THREADS,
2851 .flush = flush,
2852 .max_lowres = 3,
2853 .profiles = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2854 };
2855
2856 //legacy decoder
2857 AVCodec ff_mpegvideo_decoder = {
2858 .name = "mpegvideo",
2859 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2860 .type = AVMEDIA_TYPE_VIDEO,
2861 .id = AV_CODEC_ID_MPEG2VIDEO,
2862 .priv_data_size = sizeof(Mpeg1Context),
2863 .init = mpeg_decode_init,
2864 .close = mpeg_decode_end,
2865 .decode = mpeg_decode_frame,
2866 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2867 .flush = flush,
2868 .max_lowres = 3,
2869 };
2870
2871 #if FF_API_XVMC
2872 #if CONFIG_MPEG_XVMC_DECODER
2873 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2874 {
2875 if (avctx->active_thread_type & FF_THREAD_SLICE)
2876 return -1;
2877 if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2878 return -1;
2879 if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2880 av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2881 }
2882 mpeg_decode_init(avctx);
2883
2884 avctx->pix_fmt = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2885 avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2886
2887 return 0;
2888 }
2889
2890 AVCodec ff_mpeg_xvmc_decoder = {
2891 .name = "mpegvideo_xvmc",
2892 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2893 .type = AVMEDIA_TYPE_VIDEO,
2894 .id = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2895 .priv_data_size = sizeof(Mpeg1Context),
2896 .init = mpeg_mc_decode_init,
2897 .close = mpeg_decode_end,
2898 .decode = mpeg_decode_frame,
2899 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2900 CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2901 .flush = flush,
2902 };
2903
2904 #endif
2905 #endif /* FF_API_XVMC */
2906
2907 #if CONFIG_MPEG_VDPAU_DECODER
2908 AVCodec ff_mpeg_vdpau_decoder = {
2909 .name = "mpegvideo_vdpau",
2910 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2911 .type = AVMEDIA_TYPE_VIDEO,
2912 .id = AV_CODEC_ID_MPEG2VIDEO,
2913 .priv_data_size = sizeof(Mpeg1Context),
2914 .init = mpeg_decode_init,
2915 .close = mpeg_decode_end,
2916 .decode = mpeg_decode_frame,
2917 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2918 CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2919 .flush = flush,
2920 };
2921 #endif
2922
2923 #if CONFIG_MPEG1_VDPAU_DECODER
2924 AVCodec ff_mpeg1_vdpau_decoder = {
2925 .name = "mpeg1video_vdpau",
2926 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2927 .type = AVMEDIA_TYPE_VIDEO,
2928 .id = AV_CODEC_ID_MPEG1VIDEO,
2929 .priv_data_size = sizeof(Mpeg1Context),
2930 .init = mpeg_decode_init,
2931 .close = mpeg_decode_end,
2932 .decode = mpeg_decode_frame,
2933 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2934 CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2935 .flush = flush,
2936 };
2937 #endif
ffmpeg Piment Noir Debian package repository