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