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/imgutils.h"
33 #include "libavutil/internal.h"
34 #include "libavutil/stereo3d.h"
35
36 #include "avcodec.h"
37 #include "bytestream.h"
38 #include "error_resilience.h"
39 #include "hwconfig.h"
40 #include "idctdsp.h"
41 #include "internal.h"
42 #include "mpeg_er.h"
43 #include "mpeg12.h"
44 #include "mpeg12data.h"
45 #include "mpegutils.h"
46 #include "mpegvideo.h"
47 #include "mpegvideodata.h"
48 #include "profiles.h"
49 #include "thread.h"
50 #include "version.h"
51 #include "xvmc_internal.h"
52
53 typedef struct Mpeg1Context {
54 MpegEncContext mpeg_enc_ctx;
55 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
56 int repeat_field; /* true if we must repeat the field */
57 AVPanScan pan_scan; /* some temporary storage for the panscan */
58 AVStereo3D stereo3d;
59 int has_stereo3d;
60 uint8_t *a53_caption;
61 int a53_caption_size;
62 uint8_t afd;
63 int has_afd;
64 int slice_count;
65 AVRational save_aspect;
66 int save_width, save_height, save_progressive_seq;
67 int rc_buffer_size;
68 AVRational frame_rate_ext; /* MPEG-2 specific framerate modificator */
69 int sync; /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
70 int tmpgexs;
71 int first_slice;
72 int extradata_decoded;
73 } Mpeg1Context;
74
75 #define MB_TYPE_ZERO_MV 0x20000000
76
77 static const uint32_t ptype2mb_type[7] = {
78 MB_TYPE_INTRA,
79 MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
80 MB_TYPE_L0,
81 MB_TYPE_L0 | MB_TYPE_CBP,
82 MB_TYPE_QUANT | MB_TYPE_INTRA,
83 MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
84 MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
85 };
86
87 static const uint32_t btype2mb_type[11] = {
88 MB_TYPE_INTRA,
89 MB_TYPE_L1,
90 MB_TYPE_L1 | MB_TYPE_CBP,
91 MB_TYPE_L0,
92 MB_TYPE_L0 | MB_TYPE_CBP,
93 MB_TYPE_L0L1,
94 MB_TYPE_L0L1 | MB_TYPE_CBP,
95 MB_TYPE_QUANT | MB_TYPE_INTRA,
96 MB_TYPE_QUANT | MB_TYPE_L1 | MB_TYPE_CBP,
97 MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
98 MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
99 };
100
101 /* as H.263, but only 17 codes */
mpeg_decode_motion(MpegEncContext * s,int fcode,int pred)102 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
103 {
104 int code, sign, val, shift;
105
106 code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
107 if (code == 0)
108 return pred;
109 if (code < 0)
110 return 0xffff;
111
112 sign = get_bits1(&s->gb);
113 shift = fcode - 1;
114 val = code;
115 if (shift) {
116 val = (val - 1) << shift;
117 val |= get_bits(&s->gb, shift);
118 val++;
119 }
120 if (sign)
121 val = -val;
122 val += pred;
123
124 /* modulo decoding */
125 return sign_extend(val, 5 + shift);
126 }
127
128 #define MAX_INDEX (64 - 1)
129 #define check_scantable_index(ctx, x) \
130 do { \
131 if ((x) > MAX_INDEX) { \
132 av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", \
133 ctx->mb_x, ctx->mb_y); \
134 return AVERROR_INVALIDDATA; \
135 } \
136 } while (0)
137
mpeg1_decode_block_inter(MpegEncContext * s,int16_t * block,int n)138 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
139 int16_t *block, int n)
140 {
141 int level, i, j, run;
142 RLTable *rl = &ff_rl_mpeg1;
143 uint8_t *const scantable = s->intra_scantable.permutated;
144 const uint16_t *quant_matrix = s->inter_matrix;
145 const int qscale = s->qscale;
146
147 {
148 OPEN_READER(re, &s->gb);
149 i = -1;
150 // special case for first coefficient, no need to add second VLC table
151 UPDATE_CACHE(re, &s->gb);
152 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
153 level = (3 * qscale * quant_matrix[0]) >> 5;
154 level = (level - 1) | 1;
155 if (GET_CACHE(re, &s->gb) & 0x40000000)
156 level = -level;
157 block[0] = level;
158 i++;
159 SKIP_BITS(re, &s->gb, 2);
160 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
161 goto end;
162 }
163 /* now quantify & encode AC coefficients */
164 for (;;) {
165 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
166 TEX_VLC_BITS, 2, 0);
167
168 if (level != 0) {
169 i += run;
170 if (i > MAX_INDEX)
171 break;
172 j = scantable[i];
173 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
174 level = (level - 1) | 1;
175 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
176 SHOW_SBITS(re, &s->gb, 1);
177 SKIP_BITS(re, &s->gb, 1);
178 } else {
179 /* escape */
180 run = SHOW_UBITS(re, &s->gb, 6) + 1;
181 LAST_SKIP_BITS(re, &s->gb, 6);
182 UPDATE_CACHE(re, &s->gb);
183 level = SHOW_SBITS(re, &s->gb, 8);
184 SKIP_BITS(re, &s->gb, 8);
185 if (level == -128) {
186 level = SHOW_UBITS(re, &s->gb, 8) - 256;
187 SKIP_BITS(re, &s->gb, 8);
188 } else if (level == 0) {
189 level = SHOW_UBITS(re, &s->gb, 8);
190 SKIP_BITS(re, &s->gb, 8);
191 }
192 i += run;
193 if (i > MAX_INDEX)
194 break;
195 j = scantable[i];
196 if (level < 0) {
197 level = -level;
198 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
199 level = (level - 1) | 1;
200 level = -level;
201 } else {
202 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
203 level = (level - 1) | 1;
204 }
205 }
206
207 block[j] = level;
208 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
209 break;
210 UPDATE_CACHE(re, &s->gb);
211 }
212 end:
213 LAST_SKIP_BITS(re, &s->gb, 2);
214 CLOSE_READER(re, &s->gb);
215 }
216
217 check_scantable_index(s, i);
218
219 s->block_last_index[n] = i;
220 return 0;
221 }
222
223 /**
224 * Changing this would eat up any speed benefits it has.
225 * Do not use "fast" flag if you need the code to be robust.
226 */
mpeg1_fast_decode_block_inter(MpegEncContext * s,int16_t * block,int n)227 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
228 int16_t *block, int n)
229 {
230 int level, i, j, run;
231 RLTable *rl = &ff_rl_mpeg1;
232 uint8_t *const scantable = s->intra_scantable.permutated;
233 const int qscale = s->qscale;
234
235 {
236 OPEN_READER(re, &s->gb);
237 i = -1;
238 // Special case for first coefficient, no need to add second VLC table.
239 UPDATE_CACHE(re, &s->gb);
240 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
241 level = (3 * qscale) >> 1;
242 level = (level - 1) | 1;
243 if (GET_CACHE(re, &s->gb) & 0x40000000)
244 level = -level;
245 block[0] = level;
246 i++;
247 SKIP_BITS(re, &s->gb, 2);
248 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
249 goto end;
250 }
251
252 /* now quantify & encode AC coefficients */
253 for (;;) {
254 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
255 TEX_VLC_BITS, 2, 0);
256
257 if (level != 0) {
258 i += run;
259 if (i > MAX_INDEX)
260 break;
261 j = scantable[i];
262 level = ((level * 2 + 1) * qscale) >> 1;
263 level = (level - 1) | 1;
264 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
265 SHOW_SBITS(re, &s->gb, 1);
266 SKIP_BITS(re, &s->gb, 1);
267 } else {
268 /* escape */
269 run = SHOW_UBITS(re, &s->gb, 6) + 1;
270 LAST_SKIP_BITS(re, &s->gb, 6);
271 UPDATE_CACHE(re, &s->gb);
272 level = SHOW_SBITS(re, &s->gb, 8);
273 SKIP_BITS(re, &s->gb, 8);
274 if (level == -128) {
275 level = SHOW_UBITS(re, &s->gb, 8) - 256;
276 SKIP_BITS(re, &s->gb, 8);
277 } else if (level == 0) {
278 level = SHOW_UBITS(re, &s->gb, 8);
279 SKIP_BITS(re, &s->gb, 8);
280 }
281 i += run;
282 if (i > MAX_INDEX)
283 break;
284 j = scantable[i];
285 if (level < 0) {
286 level = -level;
287 level = ((level * 2 + 1) * qscale) >> 1;
288 level = (level - 1) | 1;
289 level = -level;
290 } else {
291 level = ((level * 2 + 1) * qscale) >> 1;
292 level = (level - 1) | 1;
293 }
294 }
295
296 block[j] = level;
297 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
298 break;
299 UPDATE_CACHE(re, &s->gb);
300 }
301 end:
302 LAST_SKIP_BITS(re, &s->gb, 2);
303 CLOSE_READER(re, &s->gb);
304 }
305
306 check_scantable_index(s, i);
307
308 s->block_last_index[n] = i;
309 return 0;
310 }
311
mpeg2_decode_block_non_intra(MpegEncContext * s,int16_t * block,int n)312 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
313 int16_t *block, int n)
314 {
315 int level, i, j, run;
316 RLTable *rl = &ff_rl_mpeg1;
317 uint8_t *const scantable = s->intra_scantable.permutated;
318 const uint16_t *quant_matrix;
319 const int qscale = s->qscale;
320 int mismatch;
321
322 mismatch = 1;
323
324 {
325 OPEN_READER(re, &s->gb);
326 i = -1;
327 if (n < 4)
328 quant_matrix = s->inter_matrix;
329 else
330 quant_matrix = s->chroma_inter_matrix;
331
332 // Special case for first coefficient, no need to add second VLC table.
333 UPDATE_CACHE(re, &s->gb);
334 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
335 level = (3 * qscale * quant_matrix[0]) >> 5;
336 if (GET_CACHE(re, &s->gb) & 0x40000000)
337 level = -level;
338 block[0] = level;
339 mismatch ^= level;
340 i++;
341 SKIP_BITS(re, &s->gb, 2);
342 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
343 goto end;
344 }
345
346 /* now quantify & encode AC coefficients */
347 for (;;) {
348 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
349 TEX_VLC_BITS, 2, 0);
350
351 if (level != 0) {
352 i += run;
353 if (i > MAX_INDEX)
354 break;
355 j = scantable[i];
356 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
357 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
358 SHOW_SBITS(re, &s->gb, 1);
359 SKIP_BITS(re, &s->gb, 1);
360 } else {
361 /* escape */
362 run = SHOW_UBITS(re, &s->gb, 6) + 1;
363 LAST_SKIP_BITS(re, &s->gb, 6);
364 UPDATE_CACHE(re, &s->gb);
365 level = SHOW_SBITS(re, &s->gb, 12);
366 SKIP_BITS(re, &s->gb, 12);
367
368 i += run;
369 if (i > MAX_INDEX)
370 break;
371 j = scantable[i];
372 if (level < 0) {
373 level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
374 level = -level;
375 } else {
376 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
377 }
378 }
379
380 mismatch ^= level;
381 block[j] = level;
382 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
383 break;
384 UPDATE_CACHE(re, &s->gb);
385 }
386 end:
387 LAST_SKIP_BITS(re, &s->gb, 2);
388 CLOSE_READER(re, &s->gb);
389 }
390 block[63] ^= (mismatch & 1);
391
392 check_scantable_index(s, i);
393
394 s->block_last_index[n] = i;
395 return 0;
396 }
397
398 /**
399 * Changing this would eat up any speed benefits it has.
400 * Do not use "fast" flag if you need the code to be robust.
401 */
mpeg2_fast_decode_block_non_intra(MpegEncContext * s,int16_t * block,int n)402 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
403 int16_t *block, int n)
404 {
405 int level, i, j, run;
406 RLTable *rl = &ff_rl_mpeg1;
407 uint8_t *const scantable = s->intra_scantable.permutated;
408 const int qscale = s->qscale;
409 OPEN_READER(re, &s->gb);
410 i = -1;
411
412 // special case for first coefficient, no need to add second VLC table
413 UPDATE_CACHE(re, &s->gb);
414 if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
415 level = (3 * qscale) >> 1;
416 if (GET_CACHE(re, &s->gb) & 0x40000000)
417 level = -level;
418 block[0] = level;
419 i++;
420 SKIP_BITS(re, &s->gb, 2);
421 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
422 goto end;
423 }
424
425 /* now quantify & encode AC coefficients */
426 for (;;) {
427 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
428
429 if (level != 0) {
430 i += run;
431 if (i > MAX_INDEX)
432 break;
433 j = scantable[i];
434 level = ((level * 2 + 1) * qscale) >> 1;
435 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
436 SHOW_SBITS(re, &s->gb, 1);
437 SKIP_BITS(re, &s->gb, 1);
438 } else {
439 /* escape */
440 run = SHOW_UBITS(re, &s->gb, 6) + 1;
441 LAST_SKIP_BITS(re, &s->gb, 6);
442 UPDATE_CACHE(re, &s->gb);
443 level = SHOW_SBITS(re, &s->gb, 12);
444 SKIP_BITS(re, &s->gb, 12);
445
446 i += run;
447 if (i > MAX_INDEX)
448 break;
449 j = scantable[i];
450 if (level < 0) {
451 level = ((-level * 2 + 1) * qscale) >> 1;
452 level = -level;
453 } else {
454 level = ((level * 2 + 1) * qscale) >> 1;
455 }
456 }
457
458 block[j] = level;
459 if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
460 break;
461
462 UPDATE_CACHE(re, &s->gb);
463 }
464 end:
465 LAST_SKIP_BITS(re, &s->gb, 2);
466 CLOSE_READER(re, &s->gb);
467
468 check_scantable_index(s, i);
469
470 s->block_last_index[n] = i;
471 return 0;
472 }
473
mpeg2_decode_block_intra(MpegEncContext * s,int16_t * block,int n)474 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
475 int16_t *block, int n)
476 {
477 int level, dc, diff, i, j, run;
478 int component;
479 RLTable *rl;
480 uint8_t *const scantable = s->intra_scantable.permutated;
481 const uint16_t *quant_matrix;
482 const int qscale = s->qscale;
483 int mismatch;
484
485 /* DC coefficient */
486 if (n < 4) {
487 quant_matrix = s->intra_matrix;
488 component = 0;
489 } else {
490 quant_matrix = s->chroma_intra_matrix;
491 component = (n & 1) + 1;
492 }
493 diff = decode_dc(&s->gb, component);
494 if (diff >= 0xffff)
495 return AVERROR_INVALIDDATA;
496 dc = s->last_dc[component];
497 dc += diff;
498 s->last_dc[component] = dc;
499 block[0] = dc * (1 << (3 - s->intra_dc_precision));
500 ff_tlog(s->avctx, "dc=%d\n", block[0]);
501 mismatch = block[0] ^ 1;
502 i = 0;
503 if (s->intra_vlc_format)
504 rl = &ff_rl_mpeg2;
505 else
506 rl = &ff_rl_mpeg1;
507
508 {
509 OPEN_READER(re, &s->gb);
510 /* now quantify & encode AC coefficients */
511 for (;;) {
512 UPDATE_CACHE(re, &s->gb);
513 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
514 TEX_VLC_BITS, 2, 0);
515
516 if (level == 127) {
517 break;
518 } else if (level != 0) {
519 i += run;
520 if (i > MAX_INDEX)
521 break;
522 j = scantable[i];
523 level = (level * qscale * quant_matrix[j]) >> 4;
524 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
525 SHOW_SBITS(re, &s->gb, 1);
526 LAST_SKIP_BITS(re, &s->gb, 1);
527 } else {
528 /* escape */
529 run = SHOW_UBITS(re, &s->gb, 6) + 1;
530 LAST_SKIP_BITS(re, &s->gb, 6);
531 UPDATE_CACHE(re, &s->gb);
532 level = SHOW_SBITS(re, &s->gb, 12);
533 SKIP_BITS(re, &s->gb, 12);
534 i += run;
535 if (i > MAX_INDEX)
536 break;
537 j = scantable[i];
538 if (level < 0) {
539 level = (-level * qscale * quant_matrix[j]) >> 4;
540 level = -level;
541 } else {
542 level = (level * qscale * quant_matrix[j]) >> 4;
543 }
544 }
545
546 mismatch ^= level;
547 block[j] = level;
548 }
549 CLOSE_READER(re, &s->gb);
550 }
551 block[63] ^= mismatch & 1;
552
553 check_scantable_index(s, i);
554
555 s->block_last_index[n] = i;
556 return 0;
557 }
558
559 /**
560 * Changing this would eat up any speed benefits it has.
561 * Do not use "fast" flag if you need the code to be robust.
562 */
mpeg2_fast_decode_block_intra(MpegEncContext * s,int16_t * block,int n)563 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
564 int16_t *block, int n)
565 {
566 int level, dc, diff, i, j, run;
567 int component;
568 RLTable *rl;
569 uint8_t *const scantable = s->intra_scantable.permutated;
570 const uint16_t *quant_matrix;
571 const int qscale = s->qscale;
572
573 /* DC coefficient */
574 if (n < 4) {
575 quant_matrix = s->intra_matrix;
576 component = 0;
577 } else {
578 quant_matrix = s->chroma_intra_matrix;
579 component = (n & 1) + 1;
580 }
581 diff = decode_dc(&s->gb, component);
582 if (diff >= 0xffff)
583 return AVERROR_INVALIDDATA;
584 dc = s->last_dc[component];
585 dc += diff;
586 s->last_dc[component] = dc;
587 block[0] = dc * (1 << (3 - s->intra_dc_precision));
588 i = 0;
589 if (s->intra_vlc_format)
590 rl = &ff_rl_mpeg2;
591 else
592 rl = &ff_rl_mpeg1;
593
594 {
595 OPEN_READER(re, &s->gb);
596 /* now quantify & encode AC coefficients */
597 for (;;) {
598 UPDATE_CACHE(re, &s->gb);
599 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
600 TEX_VLC_BITS, 2, 0);
601
602 if (level >= 64 || i > 63) {
603 break;
604 } else if (level != 0) {
605 i += run;
606 j = scantable[i];
607 level = (level * qscale * quant_matrix[j]) >> 4;
608 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
609 SHOW_SBITS(re, &s->gb, 1);
610 LAST_SKIP_BITS(re, &s->gb, 1);
611 } else {
612 /* escape */
613 run = SHOW_UBITS(re, &s->gb, 6) + 1;
614 LAST_SKIP_BITS(re, &s->gb, 6);
615 UPDATE_CACHE(re, &s->gb);
616 level = SHOW_SBITS(re, &s->gb, 12);
617 SKIP_BITS(re, &s->gb, 12);
618 i += run;
619 j = scantable[i];
620 if (level < 0) {
621 level = (-level * qscale * quant_matrix[j]) >> 4;
622 level = -level;
623 } else {
624 level = (level * qscale * quant_matrix[j]) >> 4;
625 }
626 }
627
628 block[j] = level;
629 }
630 CLOSE_READER(re, &s->gb);
631 }
632
633 check_scantable_index(s, i);
634
635 s->block_last_index[n] = i;
636 return 0;
637 }
638
639 /******************************************/
640 /* decoding */
641
get_dmv(MpegEncContext * s)642 static inline int get_dmv(MpegEncContext *s)
643 {
644 if (get_bits1(&s->gb))
645 return 1 - (get_bits1(&s->gb) << 1);
646 else
647 return 0;
648 }
649
650 /* motion type (for MPEG-2) */
651 #define MT_FIELD 1
652 #define MT_FRAME 2
653 #define MT_16X8 2
654 #define MT_DMV 3
655
mpeg_decode_mb(MpegEncContext * s,int16_t block[12][64])656 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
657 {
658 int i, j, k, cbp, val, mb_type, motion_type;
659 const int mb_block_count = 4 + (1 << s->chroma_format);
660 int ret;
661
662 ff_tlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
663
664 av_assert2(s->mb_skipped == 0);
665
666 if (s->mb_skip_run-- != 0) {
667 if (s->pict_type == AV_PICTURE_TYPE_P) {
668 s->mb_skipped = 1;
669 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
670 MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
671 } else {
672 int mb_type;
673
674 if (s->mb_x)
675 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
676 else
677 // FIXME not sure if this is allowed in MPEG at all
678 mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
679 if (IS_INTRA(mb_type)) {
680 av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
681 return AVERROR_INVALIDDATA;
682 }
683 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
684 mb_type | MB_TYPE_SKIP;
685
686 if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
687 s->mb_skipped = 1;
688 }
689
690 return 0;
691 }
692
693 switch (s->pict_type) {
694 default:
695 case AV_PICTURE_TYPE_I:
696 if (get_bits1(&s->gb) == 0) {
697 if (get_bits1(&s->gb) == 0) {
698 av_log(s->avctx, AV_LOG_ERROR,
699 "Invalid mb type in I-frame at %d %d\n",
700 s->mb_x, s->mb_y);
701 return AVERROR_INVALIDDATA;
702 }
703 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
704 } else {
705 mb_type = MB_TYPE_INTRA;
706 }
707 break;
708 case AV_PICTURE_TYPE_P:
709 mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
710 if (mb_type < 0) {
711 av_log(s->avctx, AV_LOG_ERROR,
712 "Invalid mb type in P-frame at %d %d\n", s->mb_x, s->mb_y);
713 return AVERROR_INVALIDDATA;
714 }
715 mb_type = ptype2mb_type[mb_type];
716 break;
717 case AV_PICTURE_TYPE_B:
718 mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
719 if (mb_type < 0) {
720 av_log(s->avctx, AV_LOG_ERROR,
721 "Invalid mb type in B-frame at %d %d\n", s->mb_x, s->mb_y);
722 return AVERROR_INVALIDDATA;
723 }
724 mb_type = btype2mb_type[mb_type];
725 break;
726 }
727 ff_tlog(s->avctx, "mb_type=%x\n", mb_type);
728 // motion_type = 0; /* avoid warning */
729 if (IS_INTRA(mb_type)) {
730 s->bdsp.clear_blocks(s->block[0]);
731
732 if (!s->chroma_y_shift)
733 s->bdsp.clear_blocks(s->block[6]);
734
735 /* compute DCT type */
736 // FIXME: add an interlaced_dct coded var?
737 if (s->picture_structure == PICT_FRAME &&
738 !s->frame_pred_frame_dct)
739 s->interlaced_dct = get_bits1(&s->gb);
740
741 if (IS_QUANT(mb_type))
742 s->qscale = mpeg_get_qscale(s);
743
744 if (s->concealment_motion_vectors) {
745 /* just parse them */
746 if (s->picture_structure != PICT_FRAME)
747 skip_bits1(&s->gb); /* field select */
748
749 s->mv[0][0][0] =
750 s->last_mv[0][0][0] =
751 s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
752 s->last_mv[0][0][0]);
753 s->mv[0][0][1] =
754 s->last_mv[0][0][1] =
755 s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
756 s->last_mv[0][0][1]);
757
758 check_marker(s->avctx, &s->gb, "after concealment_motion_vectors");
759 } else {
760 /* reset mv prediction */
761 memset(s->last_mv, 0, sizeof(s->last_mv));
762 }
763 s->mb_intra = 1;
764 // if 1, we memcpy blocks in xvmcvideo
765 if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
766 ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
767
768 if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
769 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
770 for (i = 0; i < 6; i++)
771 mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
772 } else {
773 for (i = 0; i < mb_block_count; i++)
774 if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
775 return ret;
776 }
777 } else {
778 for (i = 0; i < 6; i++) {
779 ret = ff_mpeg1_decode_block_intra(&s->gb,
780 s->intra_matrix,
781 s->intra_scantable.permutated,
782 s->last_dc, *s->pblocks[i],
783 i, s->qscale);
784 if (ret < 0) {
785 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
786 s->mb_x, s->mb_y);
787 return ret;
788 }
789
790 s->block_last_index[i] = ret;
791 }
792 }
793 } else {
794 if (mb_type & MB_TYPE_ZERO_MV) {
795 av_assert2(mb_type & MB_TYPE_CBP);
796
797 s->mv_dir = MV_DIR_FORWARD;
798 if (s->picture_structure == PICT_FRAME) {
799 if (s->picture_structure == PICT_FRAME
800 && !s->frame_pred_frame_dct)
801 s->interlaced_dct = get_bits1(&s->gb);
802 s->mv_type = MV_TYPE_16X16;
803 } else {
804 s->mv_type = MV_TYPE_FIELD;
805 mb_type |= MB_TYPE_INTERLACED;
806 s->field_select[0][0] = s->picture_structure - 1;
807 }
808
809 if (IS_QUANT(mb_type))
810 s->qscale = mpeg_get_qscale(s);
811
812 s->last_mv[0][0][0] = 0;
813 s->last_mv[0][0][1] = 0;
814 s->last_mv[0][1][0] = 0;
815 s->last_mv[0][1][1] = 0;
816 s->mv[0][0][0] = 0;
817 s->mv[0][0][1] = 0;
818 } else {
819 av_assert2(mb_type & MB_TYPE_L0L1);
820 // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
821 /* get additional motion vector type */
822 if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
823 motion_type = MT_FRAME;
824 } else {
825 motion_type = get_bits(&s->gb, 2);
826 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
827 s->interlaced_dct = get_bits1(&s->gb);
828 }
829
830 if (IS_QUANT(mb_type))
831 s->qscale = mpeg_get_qscale(s);
832
833 /* motion vectors */
834 s->mv_dir = (mb_type >> 13) & 3;
835 ff_tlog(s->avctx, "motion_type=%d\n", motion_type);
836 switch (motion_type) {
837 case MT_FRAME: /* or MT_16X8 */
838 if (s->picture_structure == PICT_FRAME) {
839 mb_type |= MB_TYPE_16x16;
840 s->mv_type = MV_TYPE_16X16;
841 for (i = 0; i < 2; i++) {
842 if (USES_LIST(mb_type, i)) {
843 /* MT_FRAME */
844 s->mv[i][0][0] =
845 s->last_mv[i][0][0] =
846 s->last_mv[i][1][0] =
847 mpeg_decode_motion(s, s->mpeg_f_code[i][0],
848 s->last_mv[i][0][0]);
849 s->mv[i][0][1] =
850 s->last_mv[i][0][1] =
851 s->last_mv[i][1][1] =
852 mpeg_decode_motion(s, s->mpeg_f_code[i][1],
853 s->last_mv[i][0][1]);
854 /* full_pel: only for MPEG-1 */
855 if (s->full_pel[i]) {
856 s->mv[i][0][0] *= 2;
857 s->mv[i][0][1] *= 2;
858 }
859 }
860 }
861 } else {
862 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
863 s->mv_type = MV_TYPE_16X8;
864 for (i = 0; i < 2; i++) {
865 if (USES_LIST(mb_type, i)) {
866 /* MT_16X8 */
867 for (j = 0; j < 2; j++) {
868 s->field_select[i][j] = get_bits1(&s->gb);
869 for (k = 0; k < 2; k++) {
870 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
871 s->last_mv[i][j][k]);
872 s->last_mv[i][j][k] = val;
873 s->mv[i][j][k] = val;
874 }
875 }
876 }
877 }
878 }
879 break;
880 case MT_FIELD:
881 s->mv_type = MV_TYPE_FIELD;
882 if (s->picture_structure == PICT_FRAME) {
883 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
884 for (i = 0; i < 2; i++) {
885 if (USES_LIST(mb_type, i)) {
886 for (j = 0; j < 2; j++) {
887 s->field_select[i][j] = get_bits1(&s->gb);
888 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
889 s->last_mv[i][j][0]);
890 s->last_mv[i][j][0] = val;
891 s->mv[i][j][0] = val;
892 ff_tlog(s->avctx, "fmx=%d\n", val);
893 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
894 s->last_mv[i][j][1] >> 1);
895 s->last_mv[i][j][1] = 2 * val;
896 s->mv[i][j][1] = val;
897 ff_tlog(s->avctx, "fmy=%d\n", val);
898 }
899 }
900 }
901 } else {
902 av_assert0(!s->progressive_sequence);
903 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
904 for (i = 0; i < 2; i++) {
905 if (USES_LIST(mb_type, i)) {
906 s->field_select[i][0] = get_bits1(&s->gb);
907 for (k = 0; k < 2; k++) {
908 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
909 s->last_mv[i][0][k]);
910 s->last_mv[i][0][k] = val;
911 s->last_mv[i][1][k] = val;
912 s->mv[i][0][k] = val;
913 }
914 }
915 }
916 }
917 break;
918 case MT_DMV:
919 if (s->progressive_sequence){
920 av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
921 return AVERROR_INVALIDDATA;
922 }
923 s->mv_type = MV_TYPE_DMV;
924 for (i = 0; i < 2; i++) {
925 if (USES_LIST(mb_type, i)) {
926 int dmx, dmy, mx, my, m;
927 const int my_shift = s->picture_structure == PICT_FRAME;
928
929 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
930 s->last_mv[i][0][0]);
931 s->last_mv[i][0][0] = mx;
932 s->last_mv[i][1][0] = mx;
933 dmx = get_dmv(s);
934 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
935 s->last_mv[i][0][1] >> my_shift);
936 dmy = get_dmv(s);
937
938
939 s->last_mv[i][0][1] = my * (1 << my_shift);
940 s->last_mv[i][1][1] = my * (1 << my_shift);
941
942 s->mv[i][0][0] = mx;
943 s->mv[i][0][1] = my;
944 s->mv[i][1][0] = mx; // not used
945 s->mv[i][1][1] = my; // not used
946
947 if (s->picture_structure == PICT_FRAME) {
948 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
949
950 // m = 1 + 2 * s->top_field_first;
951 m = s->top_field_first ? 1 : 3;
952
953 /* top -> top pred */
954 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
955 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
956 m = 4 - m;
957 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
958 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
959 } else {
960 mb_type |= MB_TYPE_16x16;
961
962 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
963 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
964 if (s->picture_structure == PICT_TOP_FIELD)
965 s->mv[i][2][1]--;
966 else
967 s->mv[i][2][1]++;
968 }
969 }
970 }
971 break;
972 default:
973 av_log(s->avctx, AV_LOG_ERROR,
974 "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
975 return AVERROR_INVALIDDATA;
976 }
977 }
978
979 s->mb_intra = 0;
980 if (HAS_CBP(mb_type)) {
981 s->bdsp.clear_blocks(s->block[0]);
982
983 cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
984 if (mb_block_count > 6) {
985 cbp *= 1 << mb_block_count - 6;
986 cbp |= get_bits(&s->gb, mb_block_count - 6);
987 s->bdsp.clear_blocks(s->block[6]);
988 }
989 if (cbp <= 0) {
990 av_log(s->avctx, AV_LOG_ERROR,
991 "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
992 return AVERROR_INVALIDDATA;
993 }
994
995 // if 1, we memcpy blocks in xvmcvideo
996 if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
997 ff_xvmc_pack_pblocks(s, cbp);
998
999 if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1000 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1001 for (i = 0; i < 6; i++) {
1002 if (cbp & 32)
1003 mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1004 else
1005 s->block_last_index[i] = -1;
1006 cbp += cbp;
1007 }
1008 } else {
1009 cbp <<= 12 - mb_block_count;
1010
1011 for (i = 0; i < mb_block_count; i++) {
1012 if (cbp & (1 << 11)) {
1013 if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1014 return ret;
1015 } else {
1016 s->block_last_index[i] = -1;
1017 }
1018 cbp += cbp;
1019 }
1020 }
1021 } else {
1022 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1023 for (i = 0; i < 6; i++) {
1024 if (cbp & 32)
1025 mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1026 else
1027 s->block_last_index[i] = -1;
1028 cbp += cbp;
1029 }
1030 } else {
1031 for (i = 0; i < 6; i++) {
1032 if (cbp & 32) {
1033 if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1034 return ret;
1035 } else {
1036 s->block_last_index[i] = -1;
1037 }
1038 cbp += cbp;
1039 }
1040 }
1041 }
1042 } else {
1043 for (i = 0; i < 12; i++)
1044 s->block_last_index[i] = -1;
1045 }
1046 }
1047
1048 s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1049
1050 return 0;
1051 }
1052
mpeg_decode_init(AVCodecContext * avctx)1053 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1054 {
1055 Mpeg1Context *s = avctx->priv_data;
1056 MpegEncContext *s2 = &s->mpeg_enc_ctx;
1057
1058 ff_mpv_decode_defaults(s2);
1059
1060 if ( avctx->codec_tag != AV_RL32("VCR2")
1061 && avctx->codec_tag != AV_RL32("BW10"))
1062 avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1063 ff_mpv_decode_init(s2, avctx);
1064
1065 s->mpeg_enc_ctx.avctx = avctx;
1066
1067 /* we need some permutation to store matrices,
1068 * until the decoder sets the real permutation. */
1069 ff_mpv_idct_init(s2);
1070 ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1071 ff_mpeg12_init_vlcs();
1072
1073 s2->chroma_format = 1;
1074 s->mpeg_enc_ctx_allocated = 0;
1075 s->mpeg_enc_ctx.picture_number = 0;
1076 s->repeat_field = 0;
1077 s->mpeg_enc_ctx.codec_id = avctx->codec->id;
1078 avctx->color_range = AVCOL_RANGE_MPEG;
1079 return 0;
1080 }
1081
1082 #if HAVE_THREADS
mpeg_decode_update_thread_context(AVCodecContext * avctx,const AVCodecContext * avctx_from)1083 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1084 const AVCodecContext *avctx_from)
1085 {
1086 Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1087 MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1088 int err;
1089
1090 if (avctx == avctx_from ||
1091 !ctx_from->mpeg_enc_ctx_allocated ||
1092 !s1->context_initialized)
1093 return 0;
1094
1095 err = ff_mpeg_update_thread_context(avctx, avctx_from);
1096 if (err)
1097 return err;
1098
1099 if (!ctx->mpeg_enc_ctx_allocated)
1100 memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1101
1102 if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1103 s->picture_number++;
1104
1105 return 0;
1106 }
1107 #endif
1108
quant_matrix_rebuild(uint16_t * matrix,const uint8_t * old_perm,const uint8_t * new_perm)1109 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1110 const uint8_t *new_perm)
1111 {
1112 uint16_t temp_matrix[64];
1113 int i;
1114
1115 memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1116
1117 for (i = 0; i < 64; i++)
1118 matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1119 }
1120
1121 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1122 #if CONFIG_MPEG1_NVDEC_HWACCEL
1123 AV_PIX_FMT_CUDA,
1124 #endif
1125 #if CONFIG_MPEG1_XVMC_HWACCEL
1126 AV_PIX_FMT_XVMC,
1127 #endif
1128 #if CONFIG_MPEG1_VDPAU_HWACCEL
1129 AV_PIX_FMT_VDPAU,
1130 #endif
1131 AV_PIX_FMT_YUV420P,
1132 AV_PIX_FMT_NONE
1133 };
1134
1135 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1136 #if CONFIG_MPEG2_NVDEC_HWACCEL
1137 AV_PIX_FMT_CUDA,
1138 #endif
1139 #if CONFIG_MPEG2_XVMC_HWACCEL
1140 AV_PIX_FMT_XVMC,
1141 #endif
1142 #if CONFIG_MPEG2_VDPAU_HWACCEL
1143 AV_PIX_FMT_VDPAU,
1144 #endif
1145 #if CONFIG_MPEG2_DXVA2_HWACCEL
1146 AV_PIX_FMT_DXVA2_VLD,
1147 #endif
1148 #if CONFIG_MPEG2_D3D11VA_HWACCEL
1149 AV_PIX_FMT_D3D11VA_VLD,
1150 AV_PIX_FMT_D3D11,
1151 #endif
1152 #if CONFIG_MPEG2_VAAPI_HWACCEL
1153 AV_PIX_FMT_VAAPI,
1154 #endif
1155 #if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
1156 AV_PIX_FMT_VIDEOTOOLBOX,
1157 #endif
1158 AV_PIX_FMT_YUV420P,
1159 AV_PIX_FMT_NONE
1160 };
1161
1162 static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1163 AV_PIX_FMT_YUV422P,
1164 AV_PIX_FMT_NONE
1165 };
1166
1167 static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1168 AV_PIX_FMT_YUV444P,
1169 AV_PIX_FMT_NONE
1170 };
1171
mpeg_get_pixelformat(AVCodecContext * avctx)1172 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1173 {
1174 Mpeg1Context *s1 = avctx->priv_data;
1175 MpegEncContext *s = &s1->mpeg_enc_ctx;
1176 const enum AVPixelFormat *pix_fmts;
1177
1178 if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY))
1179 return AV_PIX_FMT_GRAY8;
1180
1181 if (s->chroma_format < 2)
1182 pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1183 mpeg1_hwaccel_pixfmt_list_420 :
1184 mpeg2_hwaccel_pixfmt_list_420;
1185 else if (s->chroma_format == 2)
1186 pix_fmts = mpeg12_pixfmt_list_422;
1187 else
1188 pix_fmts = mpeg12_pixfmt_list_444;
1189
1190 return ff_thread_get_format(avctx, pix_fmts);
1191 }
1192
setup_hwaccel_for_pixfmt(AVCodecContext * avctx)1193 static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1194 {
1195 // until then pix_fmt may be changed right after codec init
1196 if (avctx->hwaccel)
1197 if (avctx->idct_algo == FF_IDCT_AUTO)
1198 avctx->idct_algo = FF_IDCT_NONE;
1199
1200 if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1201 Mpeg1Context *s1 = avctx->priv_data;
1202 MpegEncContext *s = &s1->mpeg_enc_ctx;
1203
1204 s->pack_pblocks = 1;
1205 }
1206 }
1207
1208 /* Call this function when we know all parameters.
1209 * It may be called in different places for MPEG-1 and MPEG-2. */
mpeg_decode_postinit(AVCodecContext * avctx)1210 static int mpeg_decode_postinit(AVCodecContext *avctx)
1211 {
1212 Mpeg1Context *s1 = avctx->priv_data;
1213 MpegEncContext *s = &s1->mpeg_enc_ctx;
1214 uint8_t old_permutation[64];
1215 int ret;
1216
1217 if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1218 // MPEG-1 aspect
1219 AVRational aspect_inv = av_d2q(ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1220 avctx->sample_aspect_ratio = (AVRational) { aspect_inv.den, aspect_inv.num };
1221 } else { // MPEG-2
1222 // MPEG-2 aspect
1223 if (s->aspect_ratio_info > 1) {
1224 AVRational dar =
1225 av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1226 (AVRational) { s1->pan_scan.width,
1227 s1->pan_scan.height }),
1228 (AVRational) { s->width, s->height });
1229
1230 /* We ignore the spec here and guess a bit as reality does not
1231 * match the spec, see for example res_change_ffmpeg_aspect.ts
1232 * and sequence-display-aspect.mpg.
1233 * issue1613, 621, 562 */
1234 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1235 (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1236 av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1237 s->avctx->sample_aspect_ratio =
1238 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1239 (AVRational) { s->width, s->height });
1240 } else {
1241 s->avctx->sample_aspect_ratio =
1242 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1243 (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1244 // issue1613 4/3 16/9 -> 16/9
1245 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1246 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1247 // s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1248 ff_dlog(avctx, "aspect A %d/%d\n",
1249 ff_mpeg2_aspect[s->aspect_ratio_info].num,
1250 ff_mpeg2_aspect[s->aspect_ratio_info].den);
1251 ff_dlog(avctx, "aspect B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1252 s->avctx->sample_aspect_ratio.den);
1253 }
1254 } else {
1255 s->avctx->sample_aspect_ratio =
1256 ff_mpeg2_aspect[s->aspect_ratio_info];
1257 }
1258 } // MPEG-2
1259
1260 if (av_image_check_sar(s->width, s->height,
1261 avctx->sample_aspect_ratio) < 0) {
1262 av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
1263 avctx->sample_aspect_ratio.num,
1264 avctx->sample_aspect_ratio.den);
1265 avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
1266 }
1267
1268 if ((s1->mpeg_enc_ctx_allocated == 0) ||
1269 avctx->coded_width != s->width ||
1270 avctx->coded_height != s->height ||
1271 s1->save_width != s->width ||
1272 s1->save_height != s->height ||
1273 av_cmp_q(s1->save_aspect, s->avctx->sample_aspect_ratio) ||
1274 (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1275 0) {
1276 if (s1->mpeg_enc_ctx_allocated) {
1277 ParseContext pc = s->parse_context;
1278 s->parse_context.buffer = 0;
1279 ff_mpv_common_end(s);
1280 s->parse_context = pc;
1281 s1->mpeg_enc_ctx_allocated = 0;
1282 }
1283
1284 ret = ff_set_dimensions(avctx, s->width, s->height);
1285 if (ret < 0)
1286 return ret;
1287
1288 if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1289 avctx->rc_max_rate = s->bit_rate;
1290 } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1291 (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1292 avctx->bit_rate = s->bit_rate;
1293 }
1294 s1->save_aspect = s->avctx->sample_aspect_ratio;
1295 s1->save_width = s->width;
1296 s1->save_height = s->height;
1297 s1->save_progressive_seq = s->progressive_sequence;
1298
1299 /* low_delay may be forced, in this case we will have B-frames
1300 * that behave like P-frames. */
1301 avctx->has_b_frames = !s->low_delay;
1302
1303 if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1304 // MPEG-1 fps
1305 avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1306 avctx->ticks_per_frame = 1;
1307
1308 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1309 } else { // MPEG-2
1310 // MPEG-2 fps
1311 av_reduce(&s->avctx->framerate.num,
1312 &s->avctx->framerate.den,
1313 ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1314 ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1315 1 << 30);
1316 avctx->ticks_per_frame = 2;
1317
1318 switch (s->chroma_format) {
1319 case 1: avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; break;
1320 case 2:
1321 case 3: avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT; break;
1322 default: av_assert0(0);
1323 }
1324 } // MPEG-2
1325
1326 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1327 setup_hwaccel_for_pixfmt(avctx);
1328
1329 /* Quantization matrices may need reordering
1330 * if DCT permutation is changed. */
1331 memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1332
1333 ff_mpv_idct_init(s);
1334 if ((ret = ff_mpv_common_init(s)) < 0)
1335 return ret;
1336
1337 quant_matrix_rebuild(s->intra_matrix, old_permutation, s->idsp.idct_permutation);
1338 quant_matrix_rebuild(s->inter_matrix, old_permutation, s->idsp.idct_permutation);
1339 quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1340 quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1341
1342 s1->mpeg_enc_ctx_allocated = 1;
1343 }
1344 return 0;
1345 }
1346
mpeg1_decode_picture(AVCodecContext * avctx,const uint8_t * buf,int buf_size)1347 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1348 int buf_size)
1349 {
1350 Mpeg1Context *s1 = avctx->priv_data;
1351 MpegEncContext *s = &s1->mpeg_enc_ctx;
1352 int ref, f_code, vbv_delay;
1353
1354 init_get_bits(&s->gb, buf, buf_size * 8);
1355
1356 ref = get_bits(&s->gb, 10); /* temporal ref */
1357 s->pict_type = get_bits(&s->gb, 3);
1358 if (s->pict_type == 0 || s->pict_type > 3)
1359 return AVERROR_INVALIDDATA;
1360
1361 vbv_delay = get_bits(&s->gb, 16);
1362 s->vbv_delay = vbv_delay;
1363 if (s->pict_type == AV_PICTURE_TYPE_P ||
1364 s->pict_type == AV_PICTURE_TYPE_B) {
1365 s->full_pel[0] = get_bits1(&s->gb);
1366 f_code = get_bits(&s->gb, 3);
1367 if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1368 return AVERROR_INVALIDDATA;
1369 f_code += !f_code;
1370 s->mpeg_f_code[0][0] = f_code;
1371 s->mpeg_f_code[0][1] = f_code;
1372 }
1373 if (s->pict_type == AV_PICTURE_TYPE_B) {
1374 s->full_pel[1] = get_bits1(&s->gb);
1375 f_code = get_bits(&s->gb, 3);
1376 if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1377 return AVERROR_INVALIDDATA;
1378 f_code += !f_code;
1379 s->mpeg_f_code[1][0] = f_code;
1380 s->mpeg_f_code[1][1] = f_code;
1381 }
1382 s->current_picture.f->pict_type = s->pict_type;
1383 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1384
1385 if (avctx->debug & FF_DEBUG_PICT_INFO)
1386 av_log(avctx, AV_LOG_DEBUG,
1387 "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1388
1389 s->y_dc_scale = 8;
1390 s->c_dc_scale = 8;
1391 return 0;
1392 }
1393
mpeg_decode_sequence_extension(Mpeg1Context * s1)1394 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1395 {
1396 MpegEncContext *s = &s1->mpeg_enc_ctx;
1397 int horiz_size_ext, vert_size_ext;
1398 int bit_rate_ext;
1399 AVCPBProperties *cpb_props;
1400
1401 skip_bits(&s->gb, 1); /* profile and level esc*/
1402 s->avctx->profile = get_bits(&s->gb, 3);
1403 s->avctx->level = get_bits(&s->gb, 4);
1404 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1405 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1406
1407 if (!s->chroma_format) {
1408 s->chroma_format = 1;
1409 av_log(s->avctx, AV_LOG_WARNING, "Chroma format invalid\n");
1410 }
1411
1412 horiz_size_ext = get_bits(&s->gb, 2);
1413 vert_size_ext = get_bits(&s->gb, 2);
1414 s->width |= (horiz_size_ext << 12);
1415 s->height |= (vert_size_ext << 12);
1416 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1417 s->bit_rate += (bit_rate_ext << 18) * 400LL;
1418 check_marker(s->avctx, &s->gb, "after bit rate extension");
1419 s1->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1420
1421 s->low_delay = get_bits1(&s->gb);
1422 if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
1423 s->low_delay = 1;
1424
1425 s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1426 s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1427
1428 ff_dlog(s->avctx, "sequence extension\n");
1429 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1430
1431 if (cpb_props = ff_add_cpb_side_data(s->avctx)) {
1432 cpb_props->buffer_size = s1->rc_buffer_size;
1433 if (s->bit_rate != 0x3FFFF*400)
1434 cpb_props->max_bitrate = s->bit_rate;
1435 }
1436
1437 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1438 av_log(s->avctx, AV_LOG_DEBUG,
1439 "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%"PRId64"\n",
1440 s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1441 s1->rc_buffer_size, s->bit_rate);
1442 }
1443
mpeg_decode_sequence_display_extension(Mpeg1Context * s1)1444 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1445 {
1446 MpegEncContext *s = &s1->mpeg_enc_ctx;
1447 int color_description, w, h;
1448
1449 skip_bits(&s->gb, 3); /* video format */
1450 color_description = get_bits1(&s->gb);
1451 if (color_description) {
1452 s->avctx->color_primaries = get_bits(&s->gb, 8);
1453 s->avctx->color_trc = get_bits(&s->gb, 8);
1454 s->avctx->colorspace = get_bits(&s->gb, 8);
1455 }
1456 w = get_bits(&s->gb, 14);
1457 skip_bits(&s->gb, 1); // marker
1458 h = get_bits(&s->gb, 14);
1459 // remaining 3 bits are zero padding
1460
1461 s1->pan_scan.width = 16 * w;
1462 s1->pan_scan.height = 16 * h;
1463
1464 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1465 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1466 }
1467
mpeg_decode_picture_display_extension(Mpeg1Context * s1)1468 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1469 {
1470 MpegEncContext *s = &s1->mpeg_enc_ctx;
1471 int i, nofco;
1472
1473 nofco = 1;
1474 if (s->progressive_sequence) {
1475 if (s->repeat_first_field) {
1476 nofco++;
1477 if (s->top_field_first)
1478 nofco++;
1479 }
1480 } else {
1481 if (s->picture_structure == PICT_FRAME) {
1482 nofco++;
1483 if (s->repeat_first_field)
1484 nofco++;
1485 }
1486 }
1487 for (i = 0; i < nofco; i++) {
1488 s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1489 skip_bits(&s->gb, 1); // marker
1490 s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1491 skip_bits(&s->gb, 1); // marker
1492 }
1493
1494 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1495 av_log(s->avctx, AV_LOG_DEBUG,
1496 "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1497 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1498 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1499 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1500 }
1501
load_matrix(MpegEncContext * s,uint16_t matrix0[64],uint16_t matrix1[64],int intra)1502 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1503 uint16_t matrix1[64], int intra)
1504 {
1505 int i;
1506
1507 for (i = 0; i < 64; i++) {
1508 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1509 int v = get_bits(&s->gb, 8);
1510 if (v == 0) {
1511 av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1512 return AVERROR_INVALIDDATA;
1513 }
1514 if (intra && i == 0 && v != 8) {
1515 av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1516 v = 8; // needed by pink.mpg / issue1046
1517 }
1518 matrix0[j] = v;
1519 if (matrix1)
1520 matrix1[j] = v;
1521 }
1522 return 0;
1523 }
1524
mpeg_decode_quant_matrix_extension(MpegEncContext * s)1525 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1526 {
1527 ff_dlog(s->avctx, "matrix extension\n");
1528
1529 if (get_bits1(&s->gb))
1530 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1531 if (get_bits1(&s->gb))
1532 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1533 if (get_bits1(&s->gb))
1534 load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1535 if (get_bits1(&s->gb))
1536 load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1537 }
1538
mpeg_decode_picture_coding_extension(Mpeg1Context * s1)1539 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1540 {
1541 MpegEncContext *s = &s1->mpeg_enc_ctx;
1542
1543 s->full_pel[0] = s->full_pel[1] = 0;
1544 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1545 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1546 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1547 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1548 if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1549 av_log(s->avctx, AV_LOG_ERROR,
1550 "Missing picture start code, guessing missing values\n");
1551 if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1552 if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1553 s->pict_type = AV_PICTURE_TYPE_I;
1554 else
1555 s->pict_type = AV_PICTURE_TYPE_P;
1556 } else
1557 s->pict_type = AV_PICTURE_TYPE_B;
1558 s->current_picture.f->pict_type = s->pict_type;
1559 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1560 }
1561 s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1562 s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1563 s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1564 s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1565
1566 s->intra_dc_precision = get_bits(&s->gb, 2);
1567 s->picture_structure = get_bits(&s->gb, 2);
1568 s->top_field_first = get_bits1(&s->gb);
1569 s->frame_pred_frame_dct = get_bits1(&s->gb);
1570 s->concealment_motion_vectors = get_bits1(&s->gb);
1571 s->q_scale_type = get_bits1(&s->gb);
1572 s->intra_vlc_format = get_bits1(&s->gb);
1573 s->alternate_scan = get_bits1(&s->gb);
1574 s->repeat_first_field = get_bits1(&s->gb);
1575 s->chroma_420_type = get_bits1(&s->gb);
1576 s->progressive_frame = get_bits1(&s->gb);
1577
1578 if (s->alternate_scan) {
1579 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1580 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1581 } else {
1582 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1583 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1584 }
1585
1586 /* composite display not parsed */
1587 ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1588 ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1589 ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1590 ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1591 ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1592 ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1593 ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1594 ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1595 ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1596 }
1597
mpeg_field_start(MpegEncContext * s,const uint8_t * buf,int buf_size)1598 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1599 {
1600 AVCodecContext *avctx = s->avctx;
1601 Mpeg1Context *s1 = (Mpeg1Context *) s;
1602 int ret;
1603
1604 if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) {
1605 if (s->mb_width * s->mb_height * 11LL / (33 * 2 * 8) > buf_size)
1606 return AVERROR_INVALIDDATA;
1607 }
1608
1609 /* start frame decoding */
1610 if (s->first_field || s->picture_structure == PICT_FRAME) {
1611 AVFrameSideData *pan_scan;
1612
1613 if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1614 return ret;
1615
1616 ff_mpeg_er_frame_start(s);
1617
1618 /* first check if we must repeat the frame */
1619 s->current_picture_ptr->f->repeat_pict = 0;
1620 if (s->repeat_first_field) {
1621 if (s->progressive_sequence) {
1622 if (s->top_field_first)
1623 s->current_picture_ptr->f->repeat_pict = 4;
1624 else
1625 s->current_picture_ptr->f->repeat_pict = 2;
1626 } else if (s->progressive_frame) {
1627 s->current_picture_ptr->f->repeat_pict = 1;
1628 }
1629 }
1630
1631 pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1632 AV_FRAME_DATA_PANSCAN,
1633 sizeof(s1->pan_scan));
1634 if (!pan_scan)
1635 return AVERROR(ENOMEM);
1636 memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1637
1638 if (s1->a53_caption) {
1639 AVFrameSideData *sd = av_frame_new_side_data(
1640 s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1641 s1->a53_caption_size);
1642 if (sd)
1643 memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1644 av_freep(&s1->a53_caption);
1645 }
1646
1647 if (s1->has_stereo3d) {
1648 AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1649 if (!stereo)
1650 return AVERROR(ENOMEM);
1651
1652 *stereo = s1->stereo3d;
1653 s1->has_stereo3d = 0;
1654 }
1655
1656 if (s1->has_afd) {
1657 AVFrameSideData *sd =
1658 av_frame_new_side_data(s->current_picture_ptr->f,
1659 AV_FRAME_DATA_AFD, 1);
1660 if (!sd)
1661 return AVERROR(ENOMEM);
1662
1663 *sd->data = s1->afd;
1664 s1->has_afd = 0;
1665 }
1666
1667 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1668 ff_thread_finish_setup(avctx);
1669 } else { // second field
1670 int i;
1671
1672 if (!s->current_picture_ptr) {
1673 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1674 return AVERROR_INVALIDDATA;
1675 }
1676
1677 if (s->avctx->hwaccel) {
1678 if ((ret = s->avctx->hwaccel->end_frame(s->avctx)) < 0) {
1679 av_log(avctx, AV_LOG_ERROR,
1680 "hardware accelerator failed to decode first field\n");
1681 return ret;
1682 }
1683 }
1684
1685 for (i = 0; i < 4; i++) {
1686 s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1687 if (s->picture_structure == PICT_BOTTOM_FIELD)
1688 s->current_picture.f->data[i] +=
1689 s->current_picture_ptr->f->linesize[i];
1690 }
1691 }
1692
1693 if (avctx->hwaccel) {
1694 if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1695 return ret;
1696 }
1697
1698 return 0;
1699 }
1700
1701 #define DECODE_SLICE_ERROR -1
1702 #define DECODE_SLICE_OK 0
1703
1704 /**
1705 * Decode a slice.
1706 * MpegEncContext.mb_y must be set to the MB row from the startcode.
1707 * @return DECODE_SLICE_ERROR if the slice is damaged,
1708 * DECODE_SLICE_OK if this slice is OK
1709 */
mpeg_decode_slice(MpegEncContext * s,int mb_y,const uint8_t ** buf,int buf_size)1710 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1711 const uint8_t **buf, int buf_size)
1712 {
1713 AVCodecContext *avctx = s->avctx;
1714 const int lowres = s->avctx->lowres;
1715 const int field_pic = s->picture_structure != PICT_FRAME;
1716 int ret;
1717
1718 s->resync_mb_x =
1719 s->resync_mb_y = -1;
1720
1721 av_assert0(mb_y < s->mb_height);
1722
1723 init_get_bits(&s->gb, *buf, buf_size * 8);
1724 if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1725 skip_bits(&s->gb, 3);
1726
1727 ff_mpeg1_clean_buffers(s);
1728 s->interlaced_dct = 0;
1729
1730 s->qscale = mpeg_get_qscale(s);
1731
1732 if (s->qscale == 0) {
1733 av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1734 return AVERROR_INVALIDDATA;
1735 }
1736
1737 /* extra slice info */
1738 if (skip_1stop_8data_bits(&s->gb) < 0)
1739 return AVERROR_INVALIDDATA;
1740
1741 s->mb_x = 0;
1742
1743 if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1744 skip_bits1(&s->gb);
1745 } else {
1746 while (get_bits_left(&s->gb) > 0) {
1747 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1748 MBINCR_VLC_BITS, 2);
1749 if (code < 0) {
1750 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1751 return AVERROR_INVALIDDATA;
1752 }
1753 if (code >= 33) {
1754 if (code == 33)
1755 s->mb_x += 33;
1756 /* otherwise, stuffing, nothing to do */
1757 } else {
1758 s->mb_x += code;
1759 break;
1760 }
1761 }
1762 }
1763
1764 if (s->mb_x >= (unsigned) s->mb_width) {
1765 av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1766 return AVERROR_INVALIDDATA;
1767 }
1768
1769 if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1770 const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1771 int start_code = -1;
1772 buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1773 if (buf_end < *buf + buf_size)
1774 buf_end -= 4;
1775 s->mb_y = mb_y;
1776 if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1777 return DECODE_SLICE_ERROR;
1778 *buf = buf_end;
1779 return DECODE_SLICE_OK;
1780 }
1781
1782 s->resync_mb_x = s->mb_x;
1783 s->resync_mb_y = s->mb_y = mb_y;
1784 s->mb_skip_run = 0;
1785 ff_init_block_index(s);
1786
1787 if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1788 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1789 av_log(s->avctx, AV_LOG_DEBUG,
1790 "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",
1791 s->qscale,
1792 s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1793 s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1794 s->pict_type == AV_PICTURE_TYPE_I ? "I" :
1795 (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1796 (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1797 s->progressive_sequence ? "ps" : "",
1798 s->progressive_frame ? "pf" : "",
1799 s->alternate_scan ? "alt" : "",
1800 s->top_field_first ? "top" : "",
1801 s->intra_dc_precision, s->picture_structure,
1802 s->frame_pred_frame_dct, s->concealment_motion_vectors,
1803 s->q_scale_type, s->intra_vlc_format,
1804 s->repeat_first_field, s->chroma_420_type ? "420" : "");
1805 }
1806 }
1807
1808 for (;;) {
1809 // If 1, we memcpy blocks in xvmcvideo.
1810 if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1811 ff_xvmc_init_block(s); // set s->block
1812
1813 if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1814 return ret;
1815
1816 // Note motion_val is normally NULL unless we want to extract the MVs.
1817 if (s->current_picture.motion_val[0] && !s->encoding) {
1818 const int wrap = s->b8_stride;
1819 int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1820 int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1821 int motion_x, motion_y, dir, i;
1822
1823 for (i = 0; i < 2; i++) {
1824 for (dir = 0; dir < 2; dir++) {
1825 if (s->mb_intra ||
1826 (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1827 motion_x = motion_y = 0;
1828 } else if (s->mv_type == MV_TYPE_16X16 ||
1829 (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1830 motion_x = s->mv[dir][0][0];
1831 motion_y = s->mv[dir][0][1];
1832 } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1833 motion_x = s->mv[dir][i][0];
1834 motion_y = s->mv[dir][i][1];
1835 }
1836
1837 s->current_picture.motion_val[dir][xy][0] = motion_x;
1838 s->current_picture.motion_val[dir][xy][1] = motion_y;
1839 s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1840 s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1841 s->current_picture.ref_index [dir][b8_xy] =
1842 s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1843 av_assert2(s->field_select[dir][i] == 0 ||
1844 s->field_select[dir][i] == 1);
1845 }
1846 xy += wrap;
1847 b8_xy += 2;
1848 }
1849 }
1850
1851 s->dest[0] += 16 >> lowres;
1852 s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1853 s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1854
1855 ff_mpv_reconstruct_mb(s, s->block);
1856
1857 if (++s->mb_x >= s->mb_width) {
1858 const int mb_size = 16 >> s->avctx->lowres;
1859 int left;
1860
1861 ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1862 ff_mpv_report_decode_progress(s);
1863
1864 s->mb_x = 0;
1865 s->mb_y += 1 << field_pic;
1866
1867 if (s->mb_y >= s->mb_height) {
1868 int left = get_bits_left(&s->gb);
1869 int is_d10 = s->chroma_format == 2 &&
1870 s->pict_type == AV_PICTURE_TYPE_I &&
1871 avctx->profile == 0 && avctx->level == 5 &&
1872 s->intra_dc_precision == 2 &&
1873 s->q_scale_type == 1 && s->alternate_scan == 0 &&
1874 s->progressive_frame == 0
1875 /* vbv_delay == 0xBBB || 0xE10 */;
1876
1877 if (left >= 32 && !is_d10) {
1878 GetBitContext gb = s->gb;
1879 align_get_bits(&gb);
1880 if (show_bits(&gb, 24) == 0x060E2B) {
1881 av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1882 is_d10 = 1;
1883 }
1884 if (left > 32 && show_bits_long(&gb, 32) == 0x201) {
1885 av_log(avctx, AV_LOG_DEBUG, "skipping m704 alpha (unsupported)\n");
1886 goto eos;
1887 }
1888 }
1889
1890 if (left < 0 ||
1891 (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1892 ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1893 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X at %d %d\n",
1894 left, left>0 ? show_bits(&s->gb, FFMIN(left, 23)) : 0, s->mb_x, s->mb_y);
1895 return AVERROR_INVALIDDATA;
1896 } else
1897 goto eos;
1898 }
1899 // There are some files out there which are missing the last slice
1900 // in cases where the slice is completely outside the visible
1901 // area, we detect this here instead of running into the end expecting
1902 // more data
1903 left = get_bits_left(&s->gb);
1904 if (s->mb_y >= ((s->height + 15) >> 4) &&
1905 !s->progressive_sequence &&
1906 left <= 25 &&
1907 left >= 0 &&
1908 s->mb_skip_run == -1 &&
1909 (!left || show_bits(&s->gb, left) == 0))
1910 goto eos;
1911
1912 ff_init_block_index(s);
1913 }
1914
1915 /* skip mb handling */
1916 if (s->mb_skip_run == -1) {
1917 /* read increment again */
1918 s->mb_skip_run = 0;
1919 for (;;) {
1920 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1921 MBINCR_VLC_BITS, 2);
1922 if (code < 0) {
1923 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1924 return AVERROR_INVALIDDATA;
1925 }
1926 if (code >= 33) {
1927 if (code == 33) {
1928 s->mb_skip_run += 33;
1929 } else if (code == 35) {
1930 if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1931 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1932 return AVERROR_INVALIDDATA;
1933 }
1934 goto eos; /* end of slice */
1935 }
1936 /* otherwise, stuffing, nothing to do */
1937 } else {
1938 s->mb_skip_run += code;
1939 break;
1940 }
1941 }
1942 if (s->mb_skip_run) {
1943 int i;
1944 if (s->pict_type == AV_PICTURE_TYPE_I) {
1945 av_log(s->avctx, AV_LOG_ERROR,
1946 "skipped MB in I-frame at %d %d\n", s->mb_x, s->mb_y);
1947 return AVERROR_INVALIDDATA;
1948 }
1949
1950 /* skip mb */
1951 s->mb_intra = 0;
1952 for (i = 0; i < 12; i++)
1953 s->block_last_index[i] = -1;
1954 if (s->picture_structure == PICT_FRAME)
1955 s->mv_type = MV_TYPE_16X16;
1956 else
1957 s->mv_type = MV_TYPE_FIELD;
1958 if (s->pict_type == AV_PICTURE_TYPE_P) {
1959 /* if P type, zero motion vector is implied */
1960 s->mv_dir = MV_DIR_FORWARD;
1961 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1962 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1963 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1964 s->field_select[0][0] = (s->picture_structure - 1) & 1;
1965 } else {
1966 /* if B type, reuse previous vectors and directions */
1967 s->mv[0][0][0] = s->last_mv[0][0][0];
1968 s->mv[0][0][1] = s->last_mv[0][0][1];
1969 s->mv[1][0][0] = s->last_mv[1][0][0];
1970 s->mv[1][0][1] = s->last_mv[1][0][1];
1971 s->field_select[0][0] = (s->picture_structure - 1) & 1;
1972 s->field_select[1][0] = (s->picture_structure - 1) & 1;
1973 }
1974 }
1975 }
1976 }
1977 eos: // end of slice
1978 if (get_bits_left(&s->gb) < 0) {
1979 av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1980 return AVERROR_INVALIDDATA;
1981 }
1982 *buf += (get_bits_count(&s->gb) - 1) / 8;
1983 ff_dlog(s, "Slice start:%d %d end:%d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1984 return 0;
1985 }
1986
slice_decode_thread(AVCodecContext * c,void * arg)1987 static int slice_decode_thread(AVCodecContext *c, void *arg)
1988 {
1989 MpegEncContext *s = *(void **) arg;
1990 const uint8_t *buf = s->gb.buffer;
1991 int mb_y = s->start_mb_y;
1992 const int field_pic = s->picture_structure != PICT_FRAME;
1993
1994 s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1995
1996 for (;;) {
1997 uint32_t start_code;
1998 int ret;
1999
2000 ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
2001 emms_c();
2002 ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2003 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
2004 s->start_mb_y, s->end_mb_y, s->er.error_count);
2005 if (ret < 0) {
2006 if (c->err_recognition & AV_EF_EXPLODE)
2007 return ret;
2008 if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2009 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2010 s->mb_x, s->mb_y,
2011 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2012 } else {
2013 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2014 s->mb_x - 1, s->mb_y,
2015 ER_AC_END | ER_DC_END | ER_MV_END);
2016 }
2017
2018 if (s->mb_y == s->end_mb_y)
2019 return 0;
2020
2021 start_code = -1;
2022 buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2023 if (start_code < SLICE_MIN_START_CODE || start_code > SLICE_MAX_START_CODE)
2024 return AVERROR_INVALIDDATA;
2025 mb_y = start_code - SLICE_MIN_START_CODE;
2026 if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2027 mb_y += (*buf&0xE0)<<2;
2028 mb_y <<= field_pic;
2029 if (s->picture_structure == PICT_BOTTOM_FIELD)
2030 mb_y++;
2031 if (mb_y >= s->end_mb_y)
2032 return AVERROR_INVALIDDATA;
2033 }
2034 }
2035
2036 /**
2037 * Handle slice ends.
2038 * @return 1 if it seems to be the last slice
2039 */
slice_end(AVCodecContext * avctx,AVFrame * pict)2040 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2041 {
2042 Mpeg1Context *s1 = avctx->priv_data;
2043 MpegEncContext *s = &s1->mpeg_enc_ctx;
2044
2045 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2046 return 0;
2047
2048 if (s->avctx->hwaccel) {
2049 int ret = s->avctx->hwaccel->end_frame(s->avctx);
2050 if (ret < 0) {
2051 av_log(avctx, AV_LOG_ERROR,
2052 "hardware accelerator failed to decode picture\n");
2053 return ret;
2054 }
2055 }
2056
2057 /* end of slice reached */
2058 if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2059 /* end of image */
2060
2061 ff_er_frame_end(&s->er);
2062
2063 ff_mpv_frame_end(s);
2064
2065 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2066 int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2067 if (ret < 0)
2068 return ret;
2069 ff_print_debug_info(s, s->current_picture_ptr, pict);
2070 ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2071 } else {
2072 if (avctx->active_thread_type & FF_THREAD_FRAME)
2073 s->picture_number++;
2074 /* latency of 1 frame for I- and P-frames */
2075 /* XXX: use another variable than picture_number */
2076 if (s->last_picture_ptr) {
2077 int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2078 if (ret < 0)
2079 return ret;
2080 ff_print_debug_info(s, s->last_picture_ptr, pict);
2081 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2082 }
2083 }
2084
2085 return 1;
2086 } else {
2087 return 0;
2088 }
2089 }
2090
mpeg1_decode_sequence(AVCodecContext * avctx,const uint8_t * buf,int buf_size)2091 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2092 const uint8_t *buf, int buf_size)
2093 {
2094 Mpeg1Context *s1 = avctx->priv_data;
2095 MpegEncContext *s = &s1->mpeg_enc_ctx;
2096 int width, height;
2097 int i, v, j;
2098
2099 init_get_bits(&s->gb, buf, buf_size * 8);
2100
2101 width = get_bits(&s->gb, 12);
2102 height = get_bits(&s->gb, 12);
2103 if (width == 0 || height == 0) {
2104 av_log(avctx, AV_LOG_WARNING,
2105 "Invalid horizontal or vertical size value.\n");
2106 if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2107 return AVERROR_INVALIDDATA;
2108 }
2109 s->aspect_ratio_info = get_bits(&s->gb, 4);
2110 if (s->aspect_ratio_info == 0) {
2111 av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2112 if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2113 return AVERROR_INVALIDDATA;
2114 }
2115 s->frame_rate_index = get_bits(&s->gb, 4);
2116 if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2117 av_log(avctx, AV_LOG_WARNING,
2118 "frame_rate_index %d is invalid\n", s->frame_rate_index);
2119 s->frame_rate_index = 1;
2120 }
2121 s->bit_rate = get_bits(&s->gb, 18) * 400LL;
2122 if (check_marker(s->avctx, &s->gb, "in sequence header") == 0) {
2123 return AVERROR_INVALIDDATA;
2124 }
2125
2126 s1->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2127 skip_bits(&s->gb, 1);
2128
2129 /* get matrix */
2130 if (get_bits1(&s->gb)) {
2131 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2132 } else {
2133 for (i = 0; i < 64; i++) {
2134 j = s->idsp.idct_permutation[i];
2135 v = ff_mpeg1_default_intra_matrix[i];
2136 s->intra_matrix[j] = v;
2137 s->chroma_intra_matrix[j] = v;
2138 }
2139 }
2140 if (get_bits1(&s->gb)) {
2141 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2142 } else {
2143 for (i = 0; i < 64; i++) {
2144 int j = s->idsp.idct_permutation[i];
2145 v = ff_mpeg1_default_non_intra_matrix[i];
2146 s->inter_matrix[j] = v;
2147 s->chroma_inter_matrix[j] = v;
2148 }
2149 }
2150
2151 if (show_bits(&s->gb, 23) != 0) {
2152 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2153 return AVERROR_INVALIDDATA;
2154 }
2155
2156 s->width = width;
2157 s->height = height;
2158
2159 /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2160 s->progressive_sequence = 1;
2161 s->progressive_frame = 1;
2162 s->picture_structure = PICT_FRAME;
2163 s->first_field = 0;
2164 s->frame_pred_frame_dct = 1;
2165 s->chroma_format = 1;
2166 s->codec_id =
2167 s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2168 s->out_format = FMT_MPEG1;
2169 s->swap_uv = 0; // AFAIK VCR2 does not have SEQ_HEADER
2170 if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2171 s->low_delay = 1;
2172
2173 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2174 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%"PRId64", aspect_ratio_info: %d \n",
2175 s1->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2176
2177 return 0;
2178 }
2179
vcr2_init_sequence(AVCodecContext * avctx)2180 static int vcr2_init_sequence(AVCodecContext *avctx)
2181 {
2182 Mpeg1Context *s1 = avctx->priv_data;
2183 MpegEncContext *s = &s1->mpeg_enc_ctx;
2184 int i, v, ret;
2185
2186 /* start new MPEG-1 context decoding */
2187 s->out_format = FMT_MPEG1;
2188 if (s1->mpeg_enc_ctx_allocated) {
2189 ff_mpv_common_end(s);
2190 s1->mpeg_enc_ctx_allocated = 0;
2191 }
2192 s->width = avctx->coded_width;
2193 s->height = avctx->coded_height;
2194 avctx->has_b_frames = 0; // true?
2195 s->low_delay = 1;
2196
2197 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2198 setup_hwaccel_for_pixfmt(avctx);
2199
2200 ff_mpv_idct_init(s);
2201 if ((ret = ff_mpv_common_init(s)) < 0)
2202 return ret;
2203 s1->mpeg_enc_ctx_allocated = 1;
2204
2205 for (i = 0; i < 64; i++) {
2206 int j = s->idsp.idct_permutation[i];
2207 v = ff_mpeg1_default_intra_matrix[i];
2208 s->intra_matrix[j] = v;
2209 s->chroma_intra_matrix[j] = v;
2210
2211 v = ff_mpeg1_default_non_intra_matrix[i];
2212 s->inter_matrix[j] = v;
2213 s->chroma_inter_matrix[j] = v;
2214 }
2215
2216 s->progressive_sequence = 1;
2217 s->progressive_frame = 1;
2218 s->picture_structure = PICT_FRAME;
2219 s->first_field = 0;
2220 s->frame_pred_frame_dct = 1;
2221 s->chroma_format = 1;
2222 if (s->codec_tag == AV_RL32("BW10")) {
2223 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2224 } else {
2225 s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2226 s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2227 }
2228 s1->save_width = s->width;
2229 s1->save_height = s->height;
2230 s1->save_progressive_seq = s->progressive_sequence;
2231 return 0;
2232 }
2233
mpeg_decode_a53_cc(AVCodecContext * avctx,const uint8_t * p,int buf_size)2234 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2235 const uint8_t *p, int buf_size)
2236 {
2237 Mpeg1Context *s1 = avctx->priv_data;
2238
2239 if (buf_size >= 6 &&
2240 p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2241 p[4] == 3 && (p[5] & 0x40)) {
2242 /* extract A53 Part 4 CC data */
2243 int cc_count = p[5] & 0x1f;
2244 if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2245 av_freep(&s1->a53_caption);
2246 s1->a53_caption_size = cc_count * 3;
2247 s1->a53_caption = av_malloc(s1->a53_caption_size);
2248 if (!s1->a53_caption) {
2249 s1->a53_caption_size = 0;
2250 } else {
2251 memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2252 }
2253 avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2254 }
2255 return 1;
2256 } else if (buf_size >= 2 &&
2257 p[0] == 0x03 && (p[1]&0x7f) == 0x01) {
2258 /* extract SCTE-20 CC data */
2259 GetBitContext gb;
2260 int cc_count = 0;
2261 int i;
2262
2263 init_get_bits(&gb, p + 2, buf_size - 2);
2264 cc_count = get_bits(&gb, 5);
2265 if (cc_count > 0) {
2266 av_freep(&s1->a53_caption);
2267 s1->a53_caption_size = cc_count * 3;
2268 s1->a53_caption = av_mallocz(s1->a53_caption_size);
2269 if (!s1->a53_caption) {
2270 s1->a53_caption_size = 0;
2271 } else {
2272 uint8_t field, cc1, cc2;
2273 uint8_t *cap = s1->a53_caption;
2274 for (i = 0; i < cc_count && get_bits_left(&gb) >= 26; i++) {
2275 skip_bits(&gb, 2); // priority
2276 field = get_bits(&gb, 2);
2277 skip_bits(&gb, 5); // line_offset
2278 cc1 = get_bits(&gb, 8);
2279 cc2 = get_bits(&gb, 8);
2280 skip_bits(&gb, 1); // marker
2281
2282 if (!field) { // forbidden
2283 cap[0] = cap[1] = cap[2] = 0x00;
2284 } else {
2285 field = (field == 2 ? 1 : 0);
2286 if (!s1->mpeg_enc_ctx.top_field_first) field = !field;
2287 cap[0] = 0x04 | field;
2288 cap[1] = ff_reverse[cc1];
2289 cap[2] = ff_reverse[cc2];
2290 }
2291 cap += 3;
2292 }
2293 }
2294 avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2295 }
2296 return 1;
2297 } else if (buf_size >= 11 &&
2298 p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2299 /* extract DVD CC data
2300 *
2301 * uint32_t user_data_start_code 0x000001B2 (big endian)
2302 * uint16_t user_identifier 0x4343 "CC"
2303 * uint8_t user_data_type_code 0x01
2304 * uint8_t caption_block_size 0xF8
2305 * uint8_t
2306 * bit 7 caption_odd_field_first 1=odd field (CC1/CC2) first 0=even field (CC3/CC4) first
2307 * bit 6 caption_filler 0
2308 * bit 5:1 caption_block_count number of caption blocks (pairs of caption words = frames). Most DVDs use 15 per start of GOP.
2309 * bit 0 caption_extra_field_added 1=one additional caption word
2310 *
2311 * struct caption_field_block {
2312 * uint8_t
2313 * bit 7:1 caption_filler 0x7F (all 1s)
2314 * bit 0 caption_field_odd 1=odd field (this is CC1/CC2) 0=even field (this is CC3/CC4)
2315 * uint8_t caption_first_byte
2316 * uint8_t caption_second_byte
2317 * } caption_block[(caption_block_count * 2) + caption_extra_field_added];
2318 *
2319 * Some DVDs encode caption data for both fields with caption_field_odd=1. The only way to decode the fields
2320 * correctly is to start on the field indicated by caption_odd_field_first and count between odd/even fields.
2321 * Don't assume that the first caption word is the odd field. There do exist MPEG files in the wild that start
2322 * on the even field. There also exist DVDs in the wild that encode an odd field count and the
2323 * caption_extra_field_added/caption_odd_field_first bits change per packet to allow that. */
2324 int cc_count = 0;
2325 int i;
2326 // There is a caption count field in the data, but it is often
2327 // incorrect. So count the number of captions present.
2328 for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2329 cc_count++;
2330 // Transform the DVD format into A53 Part 4 format
2331 if (cc_count > 0) {
2332 av_freep(&s1->a53_caption);
2333 s1->a53_caption_size = cc_count * 6;
2334 s1->a53_caption = av_malloc(s1->a53_caption_size);
2335 if (!s1->a53_caption) {
2336 s1->a53_caption_size = 0;
2337 } else {
2338 uint8_t field1 = !!(p[4] & 0x80);
2339 uint8_t *cap = s1->a53_caption;
2340 p += 5;
2341 for (i = 0; i < cc_count; i++) {
2342 cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2343 cap[1] = p[1];
2344 cap[2] = p[2];
2345 cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2346 cap[4] = p[4];
2347 cap[5] = p[5];
2348 cap += 6;
2349 p += 6;
2350 }
2351 }
2352 avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2353 }
2354 return 1;
2355 }
2356 return 0;
2357 }
2358
mpeg_decode_user_data(AVCodecContext * avctx,const uint8_t * p,int buf_size)2359 static void mpeg_decode_user_data(AVCodecContext *avctx,
2360 const uint8_t *p, int buf_size)
2361 {
2362 Mpeg1Context *s = avctx->priv_data;
2363 const uint8_t *buf_end = p + buf_size;
2364 Mpeg1Context *s1 = avctx->priv_data;
2365
2366 #if 0
2367 int i;
2368 for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2369 av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2370 }
2371 av_log(avctx, AV_LOG_ERROR, "\n");
2372 #endif
2373
2374 if (buf_size > 29){
2375 int i;
2376 for(i=0; i<20; i++)
2377 if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2378 s->tmpgexs= 1;
2379 }
2380 }
2381 /* we parse the DTG active format information */
2382 if (buf_end - p >= 5 &&
2383 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2384 int flags = p[4];
2385 p += 5;
2386 if (flags & 0x80) {
2387 /* skip event id */
2388 p += 2;
2389 }
2390 if (flags & 0x40) {
2391 if (buf_end - p < 1)
2392 return;
2393 s1->has_afd = 1;
2394 s1->afd = p[0] & 0x0f;
2395 }
2396 } else if (buf_end - p >= 6 &&
2397 p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2398 p[4] == 0x03) { // S3D_video_format_length
2399 // the 0x7F mask ignores the reserved_bit value
2400 const uint8_t S3D_video_format_type = p[5] & 0x7F;
2401
2402 if (S3D_video_format_type == 0x03 ||
2403 S3D_video_format_type == 0x04 ||
2404 S3D_video_format_type == 0x08 ||
2405 S3D_video_format_type == 0x23) {
2406
2407 s1->has_stereo3d = 1;
2408
2409 switch (S3D_video_format_type) {
2410 case 0x03:
2411 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2412 break;
2413 case 0x04:
2414 s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2415 break;
2416 case 0x08:
2417 s1->stereo3d.type = AV_STEREO3D_2D;
2418 break;
2419 case 0x23:
2420 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2421 break;
2422 }
2423 }
2424 } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2425 return;
2426 }
2427 }
2428
mpeg_decode_gop(AVCodecContext * avctx,const uint8_t * buf,int buf_size)2429 static void mpeg_decode_gop(AVCodecContext *avctx,
2430 const uint8_t *buf, int buf_size)
2431 {
2432 Mpeg1Context *s1 = avctx->priv_data;
2433 MpegEncContext *s = &s1->mpeg_enc_ctx;
2434 int broken_link;
2435 int64_t tc;
2436
2437 init_get_bits(&s->gb, buf, buf_size * 8);
2438
2439 tc = s-> timecode_frame_start = get_bits(&s->gb, 25);
2440
2441 #if FF_API_PRIVATE_OPT
2442 FF_DISABLE_DEPRECATION_WARNINGS
2443 avctx->timecode_frame_start = tc;
2444 FF_ENABLE_DEPRECATION_WARNINGS
2445 #endif
2446
2447 s->closed_gop = get_bits1(&s->gb);
2448 /* broken_link indicates that after editing the
2449 * reference frames of the first B-Frames after GOP I-Frame
2450 * are missing (open gop) */
2451 broken_link = get_bits1(&s->gb);
2452
2453 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2454 char tcbuf[AV_TIMECODE_STR_SIZE];
2455 av_timecode_make_mpeg_tc_string(tcbuf, tc);
2456 av_log(s->avctx, AV_LOG_DEBUG,
2457 "GOP (%s) closed_gop=%d broken_link=%d\n",
2458 tcbuf, s->closed_gop, broken_link);
2459 }
2460 }
2461
decode_chunks(AVCodecContext * avctx,AVFrame * picture,int * got_output,const uint8_t * buf,int buf_size)2462 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2463 int *got_output, const uint8_t *buf, int buf_size)
2464 {
2465 Mpeg1Context *s = avctx->priv_data;
2466 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2467 const uint8_t *buf_ptr = buf;
2468 const uint8_t *buf_end = buf + buf_size;
2469 int ret, input_size;
2470 int last_code = 0, skip_frame = 0;
2471 int picture_start_code_seen = 0;
2472
2473 for (;;) {
2474 /* find next start code */
2475 uint32_t start_code = -1;
2476 buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2477 if (start_code > 0x1ff) {
2478 if (!skip_frame) {
2479 if (HAVE_THREADS &&
2480 (avctx->active_thread_type & FF_THREAD_SLICE) &&
2481 !avctx->hwaccel) {
2482 int i;
2483 av_assert0(avctx->thread_count > 1);
2484
2485 avctx->execute(avctx, slice_decode_thread,
2486 &s2->thread_context[0], NULL,
2487 s->slice_count, sizeof(void *));
2488 for (i = 0; i < s->slice_count; i++)
2489 s2->er.error_count += s2->thread_context[i]->er.error_count;
2490 }
2491
2492 ret = slice_end(avctx, picture);
2493 if (ret < 0)
2494 return ret;
2495 else if (ret) {
2496 // FIXME: merge with the stuff in mpeg_decode_slice
2497 if (s2->last_picture_ptr || s2->low_delay || s2->pict_type == AV_PICTURE_TYPE_B)
2498 *got_output = 1;
2499 }
2500 }
2501 s2->pict_type = 0;
2502
2503 if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2504 return AVERROR_INVALIDDATA;
2505
2506 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2507 }
2508
2509 input_size = buf_end - buf_ptr;
2510
2511 if (avctx->debug & FF_DEBUG_STARTCODE)
2512 av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2513 start_code, buf_ptr - buf, input_size);
2514
2515 /* prepare data for next start code */
2516 switch (start_code) {
2517 case SEQ_START_CODE:
2518 if (last_code == 0) {
2519 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2520 if (buf != avctx->extradata)
2521 s->sync = 1;
2522 } else {
2523 av_log(avctx, AV_LOG_ERROR,
2524 "ignoring SEQ_START_CODE after %X\n", last_code);
2525 if (avctx->err_recognition & AV_EF_EXPLODE)
2526 return AVERROR_INVALIDDATA;
2527 }
2528 break;
2529
2530 case PICTURE_START_CODE:
2531 if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2532 /* If it's a frame picture, there can't be more than one picture header.
2533 Yet, it does happen and we need to handle it. */
2534 av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2535 break;
2536 }
2537 picture_start_code_seen = 1;
2538
2539 if (s2->width <= 0 || s2->height <= 0) {
2540 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2541 s2->width, s2->height);
2542 return AVERROR_INVALIDDATA;
2543 }
2544
2545 if (s->tmpgexs){
2546 s2->intra_dc_precision= 3;
2547 s2->intra_matrix[0]= 1;
2548 }
2549 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2550 !avctx->hwaccel && s->slice_count) {
2551 int i;
2552
2553 avctx->execute(avctx, slice_decode_thread,
2554 s2->thread_context, NULL,
2555 s->slice_count, sizeof(void *));
2556 for (i = 0; i < s->slice_count; i++)
2557 s2->er.error_count += s2->thread_context[i]->er.error_count;
2558 s->slice_count = 0;
2559 }
2560 if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2561 ret = mpeg_decode_postinit(avctx);
2562 if (ret < 0) {
2563 av_log(avctx, AV_LOG_ERROR,
2564 "mpeg_decode_postinit() failure\n");
2565 return ret;
2566 }
2567
2568 /* We have a complete image: we try to decompress it. */
2569 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2570 s2->pict_type = 0;
2571 s->first_slice = 1;
2572 last_code = PICTURE_START_CODE;
2573 } else {
2574 av_log(avctx, AV_LOG_ERROR,
2575 "ignoring pic after %X\n", last_code);
2576 if (avctx->err_recognition & AV_EF_EXPLODE)
2577 return AVERROR_INVALIDDATA;
2578 }
2579 break;
2580 case EXT_START_CODE:
2581 init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2582
2583 switch (get_bits(&s2->gb, 4)) {
2584 case 0x1:
2585 if (last_code == 0) {
2586 mpeg_decode_sequence_extension(s);
2587 } else {
2588 av_log(avctx, AV_LOG_ERROR,
2589 "ignoring seq ext after %X\n", last_code);
2590 if (avctx->err_recognition & AV_EF_EXPLODE)
2591 return AVERROR_INVALIDDATA;
2592 }
2593 break;
2594 case 0x2:
2595 mpeg_decode_sequence_display_extension(s);
2596 break;
2597 case 0x3:
2598 mpeg_decode_quant_matrix_extension(s2);
2599 break;
2600 case 0x7:
2601 mpeg_decode_picture_display_extension(s);
2602 break;
2603 case 0x8:
2604 if (last_code == PICTURE_START_CODE) {
2605 mpeg_decode_picture_coding_extension(s);
2606 } else {
2607 av_log(avctx, AV_LOG_ERROR,
2608 "ignoring pic cod ext after %X\n", last_code);
2609 if (avctx->err_recognition & AV_EF_EXPLODE)
2610 return AVERROR_INVALIDDATA;
2611 }
2612 break;
2613 }
2614 break;
2615 case USER_START_CODE:
2616 mpeg_decode_user_data(avctx, buf_ptr, input_size);
2617 break;
2618 case GOP_START_CODE:
2619 if (last_code == 0) {
2620 s2->first_field = 0;
2621 mpeg_decode_gop(avctx, buf_ptr, input_size);
2622 s->sync = 1;
2623 } else {
2624 av_log(avctx, AV_LOG_ERROR,
2625 "ignoring GOP_START_CODE after %X\n", last_code);
2626 if (avctx->err_recognition & AV_EF_EXPLODE)
2627 return AVERROR_INVALIDDATA;
2628 }
2629 break;
2630 default:
2631 if (start_code >= SLICE_MIN_START_CODE &&
2632 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2633 if (s2->progressive_sequence && !s2->progressive_frame) {
2634 s2->progressive_frame = 1;
2635 av_log(s2->avctx, AV_LOG_ERROR,
2636 "interlaced frame in progressive sequence, ignoring\n");
2637 }
2638
2639 if (s2->picture_structure == 0 ||
2640 (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2641 av_log(s2->avctx, AV_LOG_ERROR,
2642 "picture_structure %d invalid, ignoring\n",
2643 s2->picture_structure);
2644 s2->picture_structure = PICT_FRAME;
2645 }
2646
2647 if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2648 av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2649
2650 if (s2->picture_structure == PICT_FRAME) {
2651 s2->first_field = 0;
2652 s2->v_edge_pos = 16 * s2->mb_height;
2653 } else {
2654 s2->first_field ^= 1;
2655 s2->v_edge_pos = 8 * s2->mb_height;
2656 memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2657 }
2658 }
2659 if (start_code >= SLICE_MIN_START_CODE &&
2660 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2661 const int field_pic = s2->picture_structure != PICT_FRAME;
2662 int mb_y = start_code - SLICE_MIN_START_CODE;
2663 last_code = SLICE_MIN_START_CODE;
2664 if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2665 mb_y += (*buf_ptr&0xE0)<<2;
2666
2667 mb_y <<= field_pic;
2668 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2669 mb_y++;
2670
2671 if (buf_end - buf_ptr < 2) {
2672 av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2673 return AVERROR_INVALIDDATA;
2674 }
2675
2676 if (mb_y >= s2->mb_height) {
2677 av_log(s2->avctx, AV_LOG_ERROR,
2678 "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2679 return AVERROR_INVALIDDATA;
2680 }
2681
2682 if (!s2->last_picture_ptr) {
2683 /* Skip B-frames if we do not have reference frames and
2684 * GOP is not closed. */
2685 if (s2->pict_type == AV_PICTURE_TYPE_B) {
2686 if (!s2->closed_gop) {
2687 skip_frame = 1;
2688 av_log(s2->avctx, AV_LOG_DEBUG,
2689 "Skipping B slice due to open GOP\n");
2690 break;
2691 }
2692 }
2693 }
2694 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL))
2695 s->sync = 1;
2696 if (!s2->next_picture_ptr) {
2697 /* Skip P-frames if we do not have a reference frame or
2698 * we have an invalid header. */
2699 if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2700 skip_frame = 1;
2701 av_log(s2->avctx, AV_LOG_DEBUG,
2702 "Skipping P slice due to !sync\n");
2703 break;
2704 }
2705 }
2706 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2707 s2->pict_type == AV_PICTURE_TYPE_B) ||
2708 (avctx->skip_frame >= AVDISCARD_NONKEY &&
2709 s2->pict_type != AV_PICTURE_TYPE_I) ||
2710 avctx->skip_frame >= AVDISCARD_ALL) {
2711 skip_frame = 1;
2712 break;
2713 }
2714
2715 if (!s->mpeg_enc_ctx_allocated)
2716 break;
2717
2718 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2719 if (mb_y < avctx->skip_top ||
2720 mb_y >= s2->mb_height - avctx->skip_bottom)
2721 break;
2722 }
2723
2724 if (!s2->pict_type) {
2725 av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2726 if (avctx->err_recognition & AV_EF_EXPLODE)
2727 return AVERROR_INVALIDDATA;
2728 break;
2729 }
2730
2731 if (s->first_slice) {
2732 skip_frame = 0;
2733 s->first_slice = 0;
2734 if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2735 return ret;
2736 }
2737 if (!s2->current_picture_ptr) {
2738 av_log(avctx, AV_LOG_ERROR,
2739 "current_picture not initialized\n");
2740 return AVERROR_INVALIDDATA;
2741 }
2742
2743 if (HAVE_THREADS &&
2744 (avctx->active_thread_type & FF_THREAD_SLICE) &&
2745 !avctx->hwaccel) {
2746 int threshold = (s2->mb_height * s->slice_count +
2747 s2->slice_context_count / 2) /
2748 s2->slice_context_count;
2749 av_assert0(avctx->thread_count > 1);
2750 if (threshold <= mb_y) {
2751 MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2752
2753 thread_context->start_mb_y = mb_y;
2754 thread_context->end_mb_y = s2->mb_height;
2755 if (s->slice_count) {
2756 s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2757 ret = ff_update_duplicate_context(thread_context, s2);
2758 if (ret < 0)
2759 return ret;
2760 }
2761 init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2762 s->slice_count++;
2763 }
2764 buf_ptr += 2; // FIXME add minimum number of bytes per slice
2765 } else {
2766 ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2767 emms_c();
2768
2769 if (ret < 0) {
2770 if (avctx->err_recognition & AV_EF_EXPLODE)
2771 return ret;
2772 if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2773 ff_er_add_slice(&s2->er, s2->resync_mb_x,
2774 s2->resync_mb_y, s2->mb_x, s2->mb_y,
2775 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2776 } else {
2777 ff_er_add_slice(&s2->er, s2->resync_mb_x,
2778 s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2779 ER_AC_END | ER_DC_END | ER_MV_END);
2780 }
2781 }
2782 }
2783 break;
2784 }
2785 }
2786 }
2787
mpeg_decode_frame(AVCodecContext * avctx,void * data,int * got_output,AVPacket * avpkt)2788 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2789 int *got_output, AVPacket *avpkt)
2790 {
2791 const uint8_t *buf = avpkt->data;
2792 int ret;
2793 int buf_size = avpkt->size;
2794 Mpeg1Context *s = avctx->priv_data;
2795 AVFrame *picture = data;
2796 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2797
2798 if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2799 /* special case for last picture */
2800 if (s2->low_delay == 0 && s2->next_picture_ptr) {
2801 int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2802 if (ret < 0)
2803 return ret;
2804
2805 s2->next_picture_ptr = NULL;
2806
2807 *got_output = 1;
2808 }
2809 return buf_size;
2810 }
2811
2812 if (s2->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
2813 int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2814 buf_size, NULL);
2815
2816 if (ff_combine_frame(&s2->parse_context, next,
2817 (const uint8_t **) &buf, &buf_size) < 0)
2818 return buf_size;
2819 }
2820
2821 s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2822 if (s->mpeg_enc_ctx_allocated == 0 && ( s2->codec_tag == AV_RL32("VCR2")
2823 || s2->codec_tag == AV_RL32("BW10")
2824 ))
2825 vcr2_init_sequence(avctx);
2826
2827 s->slice_count = 0;
2828
2829 if (avctx->extradata && !s->extradata_decoded) {
2830 ret = decode_chunks(avctx, picture, got_output,
2831 avctx->extradata, avctx->extradata_size);
2832 if (*got_output) {
2833 av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2834 av_frame_unref(picture);
2835 *got_output = 0;
2836 }
2837 s->extradata_decoded = 1;
2838 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2839 s2->current_picture_ptr = NULL;
2840 return ret;
2841 }
2842 }
2843
2844 ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2845 if (ret<0 || *got_output) {
2846 s2->current_picture_ptr = NULL;
2847
2848 if (s2->timecode_frame_start != -1 && *got_output) {
2849 AVFrameSideData *tcside = av_frame_new_side_data(picture,
2850 AV_FRAME_DATA_GOP_TIMECODE,
2851 sizeof(int64_t));
2852 if (!tcside)
2853 return AVERROR(ENOMEM);
2854 memcpy(tcside->data, &s2->timecode_frame_start, sizeof(int64_t));
2855
2856 s2->timecode_frame_start = -1;
2857 }
2858 }
2859
2860 return ret;
2861 }
2862
flush(AVCodecContext * avctx)2863 static void flush(AVCodecContext *avctx)
2864 {
2865 Mpeg1Context *s = avctx->priv_data;
2866
2867 s->sync = 0;
2868
2869 ff_mpeg_flush(avctx);
2870 }
2871
mpeg_decode_end(AVCodecContext * avctx)2872 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2873 {
2874 Mpeg1Context *s = avctx->priv_data;
2875
2876 if (s->mpeg_enc_ctx_allocated)
2877 ff_mpv_common_end(&s->mpeg_enc_ctx);
2878 av_freep(&s->a53_caption);
2879 return 0;
2880 }
2881
2882 AVCodec ff_mpeg1video_decoder = {
2883 .name = "mpeg1video",
2884 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2885 .type = AVMEDIA_TYPE_VIDEO,
2886 .id = AV_CODEC_ID_MPEG1VIDEO,
2887 .priv_data_size = sizeof(Mpeg1Context),
2888 .init = mpeg_decode_init,
2889 .close = mpeg_decode_end,
2890 .decode = mpeg_decode_frame,
2891 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2892 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2893 AV_CODEC_CAP_SLICE_THREADS,
2894 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2895 .flush = flush,
2896 .max_lowres = 3,
2897 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context),
2898 .hw_configs = (const AVCodecHWConfigInternal*[]) {
2899 #if CONFIG_MPEG1_NVDEC_HWACCEL
2900 HWACCEL_NVDEC(mpeg1),
2901 #endif
2902 #if CONFIG_MPEG1_VDPAU_HWACCEL
2903 HWACCEL_VDPAU(mpeg1),
2904 #endif
2905 #if CONFIG_MPEG1_VIDEOTOOLBOX_HWACCEL
2906 HWACCEL_VIDEOTOOLBOX(mpeg1),
2907 #endif
2908 #if CONFIG_MPEG1_XVMC_HWACCEL
2909 HWACCEL_XVMC(mpeg1),
2910 #endif
2911 NULL
2912 },
2913 };
2914
2915 AVCodec ff_mpeg2video_decoder = {
2916 .name = "mpeg2video",
2917 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2918 .type = AVMEDIA_TYPE_VIDEO,
2919 .id = AV_CODEC_ID_MPEG2VIDEO,
2920 .priv_data_size = sizeof(Mpeg1Context),
2921 .init = mpeg_decode_init,
2922 .close = mpeg_decode_end,
2923 .decode = mpeg_decode_frame,
2924 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2925 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2926 AV_CODEC_CAP_SLICE_THREADS,
2927 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2928 .flush = flush,
2929 .max_lowres = 3,
2930 .profiles = NULL_IF_CONFIG_SMALL(ff_mpeg2_video_profiles),
2931 .hw_configs = (const AVCodecHWConfigInternal*[]) {
2932 #if CONFIG_MPEG2_DXVA2_HWACCEL
2933 HWACCEL_DXVA2(mpeg2),
2934 #endif
2935 #if CONFIG_MPEG2_D3D11VA_HWACCEL
2936 HWACCEL_D3D11VA(mpeg2),
2937 #endif
2938 #if CONFIG_MPEG2_D3D11VA2_HWACCEL
2939 HWACCEL_D3D11VA2(mpeg2),
2940 #endif
2941 #if CONFIG_MPEG2_NVDEC_HWACCEL
2942 HWACCEL_NVDEC(mpeg2),
2943 #endif
2944 #if CONFIG_MPEG2_VAAPI_HWACCEL
2945 HWACCEL_VAAPI(mpeg2),
2946 #endif
2947 #if CONFIG_MPEG2_VDPAU_HWACCEL
2948 HWACCEL_VDPAU(mpeg2),
2949 #endif
2950 #if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
2951 HWACCEL_VIDEOTOOLBOX(mpeg2),
2952 #endif
2953 #if CONFIG_MPEG2_XVMC_HWACCEL
2954 HWACCEL_XVMC(mpeg2),
2955 #endif
2956 NULL
2957 },
2958 };
2959
2960 //legacy decoder
2961 AVCodec ff_mpegvideo_decoder = {
2962 .name = "mpegvideo",
2963 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2964 .type = AVMEDIA_TYPE_VIDEO,
2965 .id = AV_CODEC_ID_MPEG2VIDEO,
2966 .priv_data_size = sizeof(Mpeg1Context),
2967 .init = mpeg_decode_init,
2968 .close = mpeg_decode_end,
2969 .decode = mpeg_decode_frame,
2970 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
2971 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2972 .flush = flush,
2973 .max_lowres = 3,
2974 };
2975