966f2e13fe5444ff50d9ea188dca13ea3fae38c0
[libav.git] / libavcodec / mpeg12.c
1 /*
2 * MPEG-1/2 decoder
3 * Copyright (c) 2000, 2001 Fabrice Bellard
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5 *
6 * This file is part of Libav.
7 *
8 * Libav is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * Libav is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 /**
24 * @file
25 * MPEG-1/2 decoder
26 */
27
28 //#define DEBUG
29 #include "internal.h"
30 #include "avcodec.h"
31 #include "dsputil.h"
32 #include "mpegvideo.h"
33
34 #include "mpeg12.h"
35 #include "mpeg12data.h"
36 #include "mpeg12decdata.h"
37 #include "bytestream.h"
38 #include "vdpau_internal.h"
39 #include "xvmc_internal.h"
40 #include "thread.h"
41
42 //#undef NDEBUG
43 //#include <assert.h>
44
45
46 #define MV_VLC_BITS 9
47 #define MBINCR_VLC_BITS 9
48 #define MB_PAT_VLC_BITS 9
49 #define MB_PTYPE_VLC_BITS 6
50 #define MB_BTYPE_VLC_BITS 6
51
52 static VLC mv_vlc;
53
54 /* as H.263, but only 17 codes */
55 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
56 {
57 int code, sign, val, shift;
58
59 code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
60 if (code == 0) {
61 return pred;
62 }
63 if (code < 0) {
64 return 0xffff;
65 }
66
67 sign = get_bits1(&s->gb);
68 shift = fcode - 1;
69 val = code;
70 if (shift) {
71 val = (val - 1) << shift;
72 val |= get_bits(&s->gb, shift);
73 val++;
74 }
75 if (sign)
76 val = -val;
77 val += pred;
78
79 /* modulo decoding */
80 return sign_extend(val, 5 + shift);
81 }
82
83 static inline int mpeg1_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n)
84 {
85 int level, dc, diff, i, j, run;
86 int component;
87 RLTable *rl = &ff_rl_mpeg1;
88 uint8_t * const scantable = s->intra_scantable.permutated;
89 const uint16_t *quant_matrix = s->intra_matrix;
90 const int qscale = s->qscale;
91
92 /* DC coefficient */
93 component = (n <= 3 ? 0 : n - 4 + 1);
94 diff = decode_dc(&s->gb, component);
95 if (diff >= 0xffff)
96 return -1;
97 dc = s->last_dc[component];
98 dc += diff;
99 s->last_dc[component] = dc;
100 block[0] = dc * quant_matrix[0];
101 av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
102 i = 0;
103 {
104 OPEN_READER(re, &s->gb);
105 /* now quantify & encode AC coefficients */
106 for (;;) {
107 UPDATE_CACHE(re, &s->gb);
108 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
109
110 if (level == 127) {
111 break;
112 } else if (level != 0) {
113 i += run;
114 j = scantable[i];
115 level = (level * qscale * quant_matrix[j]) >> 4;
116 level = (level - 1) | 1;
117 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
118 LAST_SKIP_BITS(re, &s->gb, 1);
119 } else {
120 /* escape */
121 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
122 UPDATE_CACHE(re, &s->gb);
123 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
124 if (level == -128) {
125 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
126 } else if (level == 0) {
127 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
128 }
129 i += run;
130 j = scantable[i];
131 if (level < 0) {
132 level = -level;
133 level = (level * qscale * quant_matrix[j]) >> 4;
134 level = (level - 1) | 1;
135 level = -level;
136 } else {
137 level = (level * qscale * quant_matrix[j]) >> 4;
138 level = (level - 1) | 1;
139 }
140 }
141 if (i > 63) {
142 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
143 return -1;
144 }
145
146 block[j] = level;
147 }
148 CLOSE_READER(re, &s->gb);
149 }
150 s->block_last_index[n] = i;
151 return 0;
152 }
153
154 int ff_mpeg1_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n)
155 {
156 return mpeg1_decode_block_intra(s, block, n);
157 }
158
159 static inline int mpeg1_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
160 {
161 int level, i, j, run;
162 RLTable *rl = &ff_rl_mpeg1;
163 uint8_t * const scantable = s->intra_scantable.permutated;
164 const uint16_t *quant_matrix = s->inter_matrix;
165 const int qscale = s->qscale;
166
167 {
168 OPEN_READER(re, &s->gb);
169 i = -1;
170 // special case for first coefficient, no need to add second VLC table
171 UPDATE_CACHE(re, &s->gb);
172 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
173 level = (3 * qscale * quant_matrix[0]) >> 5;
174 level = (level - 1) | 1;
175 if (GET_CACHE(re, &s->gb) & 0x40000000)
176 level = -level;
177 block[0] = level;
178 i++;
179 SKIP_BITS(re, &s->gb, 2);
180 if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
181 goto end;
182 }
183 /* now quantify & encode AC coefficients */
184 for (;;) {
185 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
186
187 if (level != 0) {
188 i += run;
189 j = scantable[i];
190 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
191 level = (level - 1) | 1;
192 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
193 SKIP_BITS(re, &s->gb, 1);
194 } else {
195 /* escape */
196 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
197 UPDATE_CACHE(re, &s->gb);
198 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
199 if (level == -128) {
200 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
201 } else if (level == 0) {
202 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
203 }
204 i += run;
205 j = scantable[i];
206 if (level < 0) {
207 level = -level;
208 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
209 level = (level - 1) | 1;
210 level = -level;
211 } else {
212 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
213 level = (level - 1) | 1;
214 }
215 }
216 if (i > 63) {
217 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
218 return -1;
219 }
220
221 block[j] = level;
222 if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
223 break;
224 UPDATE_CACHE(re, &s->gb);
225 }
226 end:
227 LAST_SKIP_BITS(re, &s->gb, 2);
228 CLOSE_READER(re, &s->gb);
229 }
230 s->block_last_index[n] = i;
231 return 0;
232 }
233
234 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
235 {
236 int level, i, j, run;
237 RLTable *rl = &ff_rl_mpeg1;
238 uint8_t * const scantable = s->intra_scantable.permutated;
239 const int qscale = s->qscale;
240
241 {
242 OPEN_READER(re, &s->gb);
243 i = -1;
244 // special case for first coefficient, no need to add second VLC table
245 UPDATE_CACHE(re, &s->gb);
246 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
247 level = (3 * qscale) >> 1;
248 level = (level - 1) | 1;
249 if (GET_CACHE(re, &s->gb) & 0x40000000)
250 level = -level;
251 block[0] = level;
252 i++;
253 SKIP_BITS(re, &s->gb, 2);
254 if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
255 goto end;
256 }
257
258 /* now quantify & encode AC coefficients */
259 for (;;) {
260 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
261
262 if (level != 0) {
263 i += run;
264 j = scantable[i];
265 level = ((level * 2 + 1) * qscale) >> 1;
266 level = (level - 1) | 1;
267 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
268 SKIP_BITS(re, &s->gb, 1);
269 } else {
270 /* escape */
271 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
272 UPDATE_CACHE(re, &s->gb);
273 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
274 if (level == -128) {
275 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
276 } else if (level == 0) {
277 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
278 }
279 i += run;
280 j = scantable[i];
281 if (level < 0) {
282 level = -level;
283 level = ((level * 2 + 1) * qscale) >> 1;
284 level = (level - 1) | 1;
285 level = -level;
286 } else {
287 level = ((level * 2 + 1) * qscale) >> 1;
288 level = (level - 1) | 1;
289 }
290 }
291
292 block[j] = level;
293 if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
294 break;
295 UPDATE_CACHE(re, &s->gb);
296 }
297 end:
298 LAST_SKIP_BITS(re, &s->gb, 2);
299 CLOSE_READER(re, &s->gb);
300 }
301 s->block_last_index[n] = i;
302 return 0;
303 }
304
305
306 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n)
307 {
308 int level, i, j, run;
309 RLTable *rl = &ff_rl_mpeg1;
310 uint8_t * const scantable = s->intra_scantable.permutated;
311 const uint16_t *quant_matrix;
312 const int qscale = s->qscale;
313 int mismatch;
314
315 mismatch = 1;
316
317 {
318 OPEN_READER(re, &s->gb);
319 i = -1;
320 if (n < 4)
321 quant_matrix = s->inter_matrix;
322 else
323 quant_matrix = s->chroma_inter_matrix;
324
325 // special case for first coefficient, no need to add second VLC table
326 UPDATE_CACHE(re, &s->gb);
327 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
328 level= (3 * qscale * quant_matrix[0]) >> 5;
329 if (GET_CACHE(re, &s->gb) & 0x40000000)
330 level = -level;
331 block[0] = level;
332 mismatch ^= level;
333 i++;
334 SKIP_BITS(re, &s->gb, 2);
335 if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
336 goto end;
337 }
338
339 /* now quantify & encode AC coefficients */
340 for (;;) {
341 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
342
343 if (level != 0) {
344 i += run;
345 j = scantable[i];
346 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
347 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
348 SKIP_BITS(re, &s->gb, 1);
349 } else {
350 /* escape */
351 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
352 UPDATE_CACHE(re, &s->gb);
353 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
354
355 i += run;
356 j = scantable[i];
357 if (level < 0) {
358 level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
359 level = -level;
360 } else {
361 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
362 }
363 }
364 if (i > 63) {
365 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
366 return -1;
367 }
368
369 mismatch ^= level;
370 block[j] = level;
371 if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
372 break;
373 UPDATE_CACHE(re, &s->gb);
374 }
375 end:
376 LAST_SKIP_BITS(re, &s->gb, 2);
377 CLOSE_READER(re, &s->gb);
378 }
379 block[63] ^= (mismatch & 1);
380
381 s->block_last_index[n] = i;
382 return 0;
383 }
384
385 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
386 DCTELEM *block, int n)
387 {
388 int level, i, j, run;
389 RLTable *rl = &ff_rl_mpeg1;
390 uint8_t * const scantable = s->intra_scantable.permutated;
391 const int qscale = s->qscale;
392 OPEN_READER(re, &s->gb);
393 i = -1;
394
395 // special case for first coefficient, no need to add second VLC table
396 UPDATE_CACHE(re, &s->gb);
397 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
398 level = (3 * qscale) >> 1;
399 if (GET_CACHE(re, &s->gb) & 0x40000000)
400 level = -level;
401 block[0] = level;
402 i++;
403 SKIP_BITS(re, &s->gb, 2);
404 if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
405 goto end;
406 }
407
408 /* now quantify & encode AC coefficients */
409 for (;;) {
410 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
411
412 if (level != 0) {
413 i += run;
414 j = scantable[i];
415 level = ((level * 2 + 1) * qscale) >> 1;
416 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
417 SKIP_BITS(re, &s->gb, 1);
418 } else {
419 /* escape */
420 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
421 UPDATE_CACHE(re, &s->gb);
422 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
423
424 i += run;
425 j = scantable[i];
426 if (level < 0) {
427 level = ((-level * 2 + 1) * qscale) >> 1;
428 level = -level;
429 } else {
430 level = ((level * 2 + 1) * qscale) >> 1;
431 }
432 }
433
434 block[j] = level;
435 if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
436 break;
437 UPDATE_CACHE(re, &s->gb);
438 }
439 end:
440 LAST_SKIP_BITS(re, &s->gb, 2);
441 CLOSE_READER(re, &s->gb);
442 s->block_last_index[n] = i;
443 return 0;
444 }
445
446
447 static inline int mpeg2_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n)
448 {
449 int level, dc, diff, i, j, run;
450 int component;
451 RLTable *rl;
452 uint8_t * const scantable = s->intra_scantable.permutated;
453 const uint16_t *quant_matrix;
454 const int qscale = s->qscale;
455 int mismatch;
456
457 /* DC coefficient */
458 if (n < 4) {
459 quant_matrix = s->intra_matrix;
460 component = 0;
461 } else {
462 quant_matrix = s->chroma_intra_matrix;
463 component = (n & 1) + 1;
464 }
465 diff = decode_dc(&s->gb, component);
466 if (diff >= 0xffff)
467 return -1;
468 dc = s->last_dc[component];
469 dc += diff;
470 s->last_dc[component] = dc;
471 block[0] = dc << (3 - s->intra_dc_precision);
472 av_dlog(s->avctx, "dc=%d\n", block[0]);
473 mismatch = block[0] ^ 1;
474 i = 0;
475 if (s->intra_vlc_format)
476 rl = &ff_rl_mpeg2;
477 else
478 rl = &ff_rl_mpeg1;
479
480 {
481 OPEN_READER(re, &s->gb);
482 /* now quantify & encode AC coefficients */
483 for (;;) {
484 UPDATE_CACHE(re, &s->gb);
485 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
486
487 if (level == 127) {
488 break;
489 } else if (level != 0) {
490 i += run;
491 j = scantable[i];
492 level = (level * qscale * quant_matrix[j]) >> 4;
493 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
494 LAST_SKIP_BITS(re, &s->gb, 1);
495 } else {
496 /* escape */
497 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
498 UPDATE_CACHE(re, &s->gb);
499 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
500 i += run;
501 j = scantable[i];
502 if (level < 0) {
503 level = (-level * qscale * quant_matrix[j]) >> 4;
504 level = -level;
505 } else {
506 level = (level * qscale * quant_matrix[j]) >> 4;
507 }
508 }
509 if (i > 63) {
510 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
511 return -1;
512 }
513
514 mismatch ^= level;
515 block[j] = level;
516 }
517 CLOSE_READER(re, &s->gb);
518 }
519 block[63] ^= mismatch & 1;
520
521 s->block_last_index[n] = i;
522 return 0;
523 }
524
525 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n)
526 {
527 int level, dc, diff, j, run;
528 int component;
529 RLTable *rl;
530 uint8_t * scantable = s->intra_scantable.permutated;
531 const uint16_t *quant_matrix;
532 const int qscale = s->qscale;
533
534 /* DC coefficient */
535 if (n < 4) {
536 quant_matrix = s->intra_matrix;
537 component = 0;
538 } else {
539 quant_matrix = s->chroma_intra_matrix;
540 component = (n & 1) + 1;
541 }
542 diff = decode_dc(&s->gb, component);
543 if (diff >= 0xffff)
544 return -1;
545 dc = s->last_dc[component];
546 dc += diff;
547 s->last_dc[component] = dc;
548 block[0] = dc << (3 - s->intra_dc_precision);
549 if (s->intra_vlc_format)
550 rl = &ff_rl_mpeg2;
551 else
552 rl = &ff_rl_mpeg1;
553
554 {
555 OPEN_READER(re, &s->gb);
556 /* now quantify & encode AC coefficients */
557 for (;;) {
558 UPDATE_CACHE(re, &s->gb);
559 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
560
561 if (level == 127) {
562 break;
563 } else if (level != 0) {
564 scantable += run;
565 j = *scantable;
566 level = (level * qscale * quant_matrix[j]) >> 4;
567 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
568 LAST_SKIP_BITS(re, &s->gb, 1);
569 } else {
570 /* escape */
571 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
572 UPDATE_CACHE(re, &s->gb);
573 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
574 scantable += run;
575 j = *scantable;
576 if (level < 0) {
577 level = (-level * qscale * quant_matrix[j]) >> 4;
578 level = -level;
579 } else {
580 level = (level * qscale * quant_matrix[j]) >> 4;
581 }
582 }
583
584 block[j] = level;
585 }
586 CLOSE_READER(re, &s->gb);
587 }
588
589 s->block_last_index[n] = scantable - s->intra_scantable.permutated;
590 return 0;
591 }
592
593 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
594
595 #define INIT_2D_VLC_RL(rl, static_size)\
596 {\
597 static RL_VLC_ELEM rl_vlc_table[static_size];\
598 INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
599 &rl.table_vlc[0][1], 4, 2,\
600 &rl.table_vlc[0][0], 4, 2, static_size);\
601 \
602 rl.rl_vlc[0] = rl_vlc_table;\
603 init_2d_vlc_rl(&rl);\
604 }
605
606 static void init_2d_vlc_rl(RLTable *rl)
607 {
608 int i;
609
610 for (i = 0; i < rl->vlc.table_size; i++) {
611 int code = rl->vlc.table[i][0];
612 int len = rl->vlc.table[i][1];
613 int level, run;
614
615 if (len == 0) { // illegal code
616 run = 65;
617 level = MAX_LEVEL;
618 } else if (len<0) { //more bits needed
619 run = 0;
620 level = code;
621 } else {
622 if (code == rl->n) { //esc
623 run = 65;
624 level = 0;
625 } else if (code == rl->n+1) { //eob
626 run = 0;
627 level = 127;
628 } else {
629 run = rl->table_run [code] + 1;
630 level = rl->table_level[code];
631 }
632 }
633 rl->rl_vlc[0][i].len = len;
634 rl->rl_vlc[0][i].level = level;
635 rl->rl_vlc[0][i].run = run;
636 }
637 }
638
639 void ff_mpeg12_common_init(MpegEncContext *s)
640 {
641
642 s->y_dc_scale_table =
643 s->c_dc_scale_table = ff_mpeg2_dc_scale_table[s->intra_dc_precision];
644
645 }
646
647 void ff_mpeg1_clean_buffers(MpegEncContext *s)
648 {
649 s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
650 s->last_dc[1] = s->last_dc[0];
651 s->last_dc[2] = s->last_dc[0];
652 memset(s->last_mv, 0, sizeof(s->last_mv));
653 }
654
655
656 /******************************************/
657 /* decoding */
658
659 VLC ff_dc_lum_vlc;
660 VLC ff_dc_chroma_vlc;
661
662 static VLC mbincr_vlc;
663 static VLC mb_ptype_vlc;
664 static VLC mb_btype_vlc;
665 static VLC mb_pat_vlc;
666
667 av_cold void ff_mpeg12_init_vlcs(void)
668 {
669 static int done = 0;
670
671 if (!done) {
672 done = 1;
673
674 INIT_VLC_STATIC(&ff_dc_lum_vlc, DC_VLC_BITS, 12,
675 ff_mpeg12_vlc_dc_lum_bits, 1, 1,
676 ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
677 INIT_VLC_STATIC(&ff_dc_chroma_vlc, DC_VLC_BITS, 12,
678 ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
679 ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
680 INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
681 &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
682 &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
683 INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
684 &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
685 &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
686 INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
687 &ff_mpeg12_mbPatTable[0][1], 2, 1,
688 &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
689
690 INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
691 &table_mb_ptype[0][1], 2, 1,
692 &table_mb_ptype[0][0], 2, 1, 64);
693 INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
694 &table_mb_btype[0][1], 2, 1,
695 &table_mb_btype[0][0], 2, 1, 64);
696 ff_init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
697 ff_init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
698
699 INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
700 INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
701 }
702 }
703
704 static inline int get_dmv(MpegEncContext *s)
705 {
706 if (get_bits1(&s->gb))
707 return 1 - (get_bits1(&s->gb) << 1);
708 else
709 return 0;
710 }
711
712 static inline int get_qscale(MpegEncContext *s)
713 {
714 int qscale = get_bits(&s->gb, 5);
715 if (s->q_scale_type) {
716 return non_linear_qscale[qscale];
717 } else {
718 return qscale << 1;
719 }
720 }
721
722 static void exchange_uv(MpegEncContext *s)
723 {
724 DCTELEM (*tmp)[64];
725
726 tmp = s->pblocks[4];
727 s->pblocks[4] = s->pblocks[5];
728 s->pblocks[5] = tmp;
729 }
730
731 /* motion type (for MPEG-2) */
732 #define MT_FIELD 1
733 #define MT_FRAME 2
734 #define MT_16X8 2
735 #define MT_DMV 3
736
737 static int mpeg_decode_mb(MpegEncContext *s, DCTELEM block[12][64])
738 {
739 int i, j, k, cbp, val, mb_type, motion_type;
740 const int mb_block_count = 4 + (1 << s->chroma_format);
741
742 av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
743
744 assert(s->mb_skipped == 0);
745
746 if (s->mb_skip_run-- != 0) {
747 if (s->pict_type == AV_PICTURE_TYPE_P) {
748 s->mb_skipped = 1;
749 s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride] = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
750 } else {
751 int mb_type;
752
753 if (s->mb_x)
754 mb_type = s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
755 else
756 mb_type = s->current_picture.f.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1]; // FIXME not sure if this is allowed in MPEG at all
757 if (IS_INTRA(mb_type))
758 return -1;
759 s->current_picture.f.mb_type[s->mb_x + s->mb_y*s->mb_stride] =
760 mb_type | MB_TYPE_SKIP;
761 // assert(s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1] & (MB_TYPE_16x16 | MB_TYPE_16x8));
762
763 if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
764 s->mb_skipped = 1;
765 }
766
767 return 0;
768 }
769
770 switch (s->pict_type) {
771 default:
772 case AV_PICTURE_TYPE_I:
773 if (get_bits1(&s->gb) == 0) {
774 if (get_bits1(&s->gb) == 0) {
775 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
776 return -1;
777 }
778 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
779 } else {
780 mb_type = MB_TYPE_INTRA;
781 }
782 break;
783 case AV_PICTURE_TYPE_P:
784 mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
785 if (mb_type < 0) {
786 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
787 return -1;
788 }
789 mb_type = ptype2mb_type[mb_type];
790 break;
791 case AV_PICTURE_TYPE_B:
792 mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
793 if (mb_type < 0) {
794 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
795 return -1;
796 }
797 mb_type = btype2mb_type[mb_type];
798 break;
799 }
800 av_dlog(s->avctx, "mb_type=%x\n", mb_type);
801 // motion_type = 0; /* avoid warning */
802 if (IS_INTRA(mb_type)) {
803 s->dsp.clear_blocks(s->block[0]);
804
805 if (!s->chroma_y_shift) {
806 s->dsp.clear_blocks(s->block[6]);
807 }
808
809 /* compute DCT type */
810 if (s->picture_structure == PICT_FRAME && // FIXME add an interlaced_dct coded var?
811 !s->frame_pred_frame_dct) {
812 s->interlaced_dct = get_bits1(&s->gb);
813 }
814
815 if (IS_QUANT(mb_type))
816 s->qscale = get_qscale(s);
817
818 if (s->concealment_motion_vectors) {
819 /* just parse them */
820 if (s->picture_structure != PICT_FRAME)
821 skip_bits1(&s->gb); /* field select */
822
823 s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
824 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
825 s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
826 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
827
828 skip_bits1(&s->gb); /* marker */
829 } else
830 memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
831 s->mb_intra = 1;
832 // if 1, we memcpy blocks in xvmcvideo
833 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
834 ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
835 if (s->swap_uv) {
836 exchange_uv(s);
837 }
838 }
839
840 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
841 if (s->flags2 & CODEC_FLAG2_FAST) {
842 for (i = 0; i < 6; i++) {
843 mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
844 }
845 } else {
846 for (i = 0; i < mb_block_count; i++) {
847 if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
848 return -1;
849 }
850 }
851 } else {
852 for (i = 0; i < 6; i++) {
853 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
854 return -1;
855 }
856 }
857 } else {
858 if (mb_type & MB_TYPE_ZERO_MV) {
859 assert(mb_type & MB_TYPE_CBP);
860
861 s->mv_dir = MV_DIR_FORWARD;
862 if (s->picture_structure == PICT_FRAME) {
863 if (!s->frame_pred_frame_dct)
864 s->interlaced_dct = get_bits1(&s->gb);
865 s->mv_type = MV_TYPE_16X16;
866 } else {
867 s->mv_type = MV_TYPE_FIELD;
868 mb_type |= MB_TYPE_INTERLACED;
869 s->field_select[0][0] = s->picture_structure - 1;
870 }
871
872 if (IS_QUANT(mb_type))
873 s->qscale = get_qscale(s);
874
875 s->last_mv[0][0][0] = 0;
876 s->last_mv[0][0][1] = 0;
877 s->last_mv[0][1][0] = 0;
878 s->last_mv[0][1][1] = 0;
879 s->mv[0][0][0] = 0;
880 s->mv[0][0][1] = 0;
881 } else {
882 assert(mb_type & MB_TYPE_L0L1);
883 // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
884 /* get additional motion vector type */
885 if (s->frame_pred_frame_dct)
886 motion_type = MT_FRAME;
887 else {
888 motion_type = get_bits(&s->gb, 2);
889 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
890 s->interlaced_dct = get_bits1(&s->gb);
891 }
892
893 if (IS_QUANT(mb_type))
894 s->qscale = get_qscale(s);
895
896 /* motion vectors */
897 s->mv_dir = (mb_type >> 13) & 3;
898 av_dlog(s->avctx, "motion_type=%d\n", motion_type);
899 switch (motion_type) {
900 case MT_FRAME: /* or MT_16X8 */
901 if (s->picture_structure == PICT_FRAME) {
902 mb_type |= MB_TYPE_16x16;
903 s->mv_type = MV_TYPE_16X16;
904 for (i = 0; i < 2; i++) {
905 if (USES_LIST(mb_type, i)) {
906 /* MT_FRAME */
907 s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
908 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
909 s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
910 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
911 /* full_pel: only for MPEG-1 */
912 if (s->full_pel[i]) {
913 s->mv[i][0][0] <<= 1;
914 s->mv[i][0][1] <<= 1;
915 }
916 }
917 }
918 } else {
919 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
920 s->mv_type = MV_TYPE_16X8;
921 for (i = 0; i < 2; i++) {
922 if (USES_LIST(mb_type, i)) {
923 /* MT_16X8 */
924 for (j = 0; j < 2; j++) {
925 s->field_select[i][j] = get_bits1(&s->gb);
926 for (k = 0; k < 2; k++) {
927 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
928 s->last_mv[i][j][k]);
929 s->last_mv[i][j][k] = val;
930 s->mv[i][j][k] = val;
931 }
932 }
933 }
934 }
935 }
936 break;
937 case MT_FIELD:
938 s->mv_type = MV_TYPE_FIELD;
939 if (s->picture_structure == PICT_FRAME) {
940 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
941 for (i = 0; i < 2; i++) {
942 if (USES_LIST(mb_type, i)) {
943 for (j = 0; j < 2; j++) {
944 s->field_select[i][j] = get_bits1(&s->gb);
945 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
946 s->last_mv[i][j][0]);
947 s->last_mv[i][j][0] = val;
948 s->mv[i][j][0] = val;
949 av_dlog(s->avctx, "fmx=%d\n", val);
950 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
951 s->last_mv[i][j][1] >> 1);
952 s->last_mv[i][j][1] = val << 1;
953 s->mv[i][j][1] = val;
954 av_dlog(s->avctx, "fmy=%d\n", val);
955 }
956 }
957 }
958 } else {
959 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
960 for (i = 0; i < 2; i++) {
961 if (USES_LIST(mb_type, i)) {
962 s->field_select[i][0] = get_bits1(&s->gb);
963 for (k = 0; k < 2; k++) {
964 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
965 s->last_mv[i][0][k]);
966 s->last_mv[i][0][k] = val;
967 s->last_mv[i][1][k] = val;
968 s->mv[i][0][k] = val;
969 }
970 }
971 }
972 }
973 break;
974 case MT_DMV:
975 s->mv_type = MV_TYPE_DMV;
976 for (i = 0; i < 2; i++) {
977 if (USES_LIST(mb_type, i)) {
978 int dmx, dmy, mx, my, m;
979 const int my_shift = s->picture_structure == PICT_FRAME;
980
981 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
982 s->last_mv[i][0][0]);
983 s->last_mv[i][0][0] = mx;
984 s->last_mv[i][1][0] = mx;
985 dmx = get_dmv(s);
986 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
987 s->last_mv[i][0][1] >> my_shift);
988 dmy = get_dmv(s);
989
990
991 s->last_mv[i][0][1] = my << my_shift;
992 s->last_mv[i][1][1] = my << my_shift;
993
994 s->mv[i][0][0] = mx;
995 s->mv[i][0][1] = my;
996 s->mv[i][1][0] = mx; // not used
997 s->mv[i][1][1] = my; // not used
998
999 if (s->picture_structure == PICT_FRAME) {
1000 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1001
1002 // m = 1 + 2 * s->top_field_first;
1003 m = s->top_field_first ? 1 : 3;
1004
1005 /* top -> top pred */
1006 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1007 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1008 m = 4 - m;
1009 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1010 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1011 } else {
1012 mb_type |= MB_TYPE_16x16;
1013
1014 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1015 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1016 if (s->picture_structure == PICT_TOP_FIELD)
1017 s->mv[i][2][1]--;
1018 else
1019 s->mv[i][2][1]++;
1020 }
1021 }
1022 }
1023 break;
1024 default:
1025 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1026 return -1;
1027 }
1028 }
1029
1030 s->mb_intra = 0;
1031 if (HAS_CBP(mb_type)) {
1032 s->dsp.clear_blocks(s->block[0]);
1033
1034 cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1035 if (mb_block_count > 6) {
1036 cbp <<= mb_block_count - 6;
1037 cbp |= get_bits(&s->gb, mb_block_count - 6);
1038 s->dsp.clear_blocks(s->block[6]);
1039 }
1040 if (cbp <= 0) {
1041 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1042 return -1;
1043 }
1044
1045 //if 1, we memcpy blocks in xvmcvideo
1046 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
1047 ff_xvmc_pack_pblocks(s, cbp);
1048 if (s->swap_uv) {
1049 exchange_uv(s);
1050 }
1051 }
1052
1053 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1054 if (s->flags2 & CODEC_FLAG2_FAST) {
1055 for (i = 0; i < 6; i++) {
1056 if (cbp & 32) {
1057 mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1058 } else {
1059 s->block_last_index[i] = -1;
1060 }
1061 cbp += cbp;
1062 }
1063 } else {
1064 cbp <<= 12-mb_block_count;
1065
1066 for (i = 0; i < mb_block_count; i++) {
1067 if (cbp & (1 << 11)) {
1068 if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
1069 return -1;
1070 } else {
1071 s->block_last_index[i] = -1;
1072 }
1073 cbp += cbp;
1074 }
1075 }
1076 } else {
1077 if (s->flags2 & CODEC_FLAG2_FAST) {
1078 for (i = 0; i < 6; i++) {
1079 if (cbp & 32) {
1080 mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1081 } else {
1082 s->block_last_index[i] = -1;
1083 }
1084 cbp += cbp;
1085 }
1086 } else {
1087 for (i = 0; i < 6; i++) {
1088 if (cbp & 32) {
1089 if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
1090 return -1;
1091 } else {
1092 s->block_last_index[i] = -1;
1093 }
1094 cbp += cbp;
1095 }
1096 }
1097 }
1098 } else {
1099 for (i = 0; i < 12; i++)
1100 s->block_last_index[i] = -1;
1101 }
1102 }
1103
1104 s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1105
1106 return 0;
1107 }
1108
1109 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1110 {
1111 Mpeg1Context *s = avctx->priv_data;
1112 MpegEncContext *s2 = &s->mpeg_enc_ctx;
1113 int i;
1114
1115 /* we need some permutation to store matrices,
1116 * until MPV_common_init() sets the real permutation. */
1117 for (i = 0; i < 64; i++)
1118 s2->dsp.idct_permutation[i]=i;
1119
1120 ff_MPV_decode_defaults(s2);
1121
1122 s->mpeg_enc_ctx.avctx = avctx;
1123 s->mpeg_enc_ctx.flags = avctx->flags;
1124 s->mpeg_enc_ctx.flags2 = avctx->flags2;
1125 ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1126 ff_mpeg12_init_vlcs();
1127
1128 s->mpeg_enc_ctx_allocated = 0;
1129 s->mpeg_enc_ctx.picture_number = 0;
1130 s->repeat_field = 0;
1131 s->mpeg_enc_ctx.codec_id = avctx->codec->id;
1132 avctx->color_range = AVCOL_RANGE_MPEG;
1133 if (avctx->codec->id == CODEC_ID_MPEG1VIDEO)
1134 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1135 else
1136 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1137 return 0;
1138 }
1139
1140 static int mpeg_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
1141 {
1142 Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1143 MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1144 int err;
1145
1146 if (avctx == avctx_from || !ctx_from->mpeg_enc_ctx_allocated || !s1->context_initialized)
1147 return 0;
1148
1149 err = ff_mpeg_update_thread_context(avctx, avctx_from);
1150 if (err) return err;
1151
1152 if (!ctx->mpeg_enc_ctx_allocated)
1153 memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1154
1155 if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1156 s->picture_number++;
1157
1158 return 0;
1159 }
1160
1161 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1162 const uint8_t *new_perm)
1163 {
1164 uint16_t temp_matrix[64];
1165 int i;
1166
1167 memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1168
1169 for (i = 0; i < 64; i++) {
1170 matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1171 }
1172 }
1173
1174 static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
1175 PIX_FMT_XVMC_MPEG2_IDCT,
1176 PIX_FMT_XVMC_MPEG2_MC,
1177 PIX_FMT_NONE };
1178
1179 static enum PixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1180 {
1181 Mpeg1Context *s1 = avctx->priv_data;
1182 MpegEncContext *s = &s1->mpeg_enc_ctx;
1183
1184 if (avctx->xvmc_acceleration)
1185 return avctx->get_format(avctx, pixfmt_xvmc_mpg2_420);
1186 else if (avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU) {
1187 if (avctx->codec_id == CODEC_ID_MPEG1VIDEO)
1188 return PIX_FMT_VDPAU_MPEG1;
1189 else
1190 return PIX_FMT_VDPAU_MPEG2;
1191 } else {
1192 if (s->chroma_format < 2)
1193 return avctx->get_format(avctx, ff_hwaccel_pixfmt_list_420);
1194 else if (s->chroma_format == 2)
1195 return PIX_FMT_YUV422P;
1196 else
1197 return PIX_FMT_YUV444P;
1198 }
1199 }
1200
1201 /* Call this function when we know all parameters.
1202 * It may be called in different places for MPEG-1 and MPEG-2. */
1203 static int mpeg_decode_postinit(AVCodecContext *avctx)
1204 {
1205 Mpeg1Context *s1 = avctx->priv_data;
1206 MpegEncContext *s = &s1->mpeg_enc_ctx;
1207 uint8_t old_permutation[64];
1208
1209 if ((s1->mpeg_enc_ctx_allocated == 0) ||
1210 avctx->coded_width != s->width ||
1211 avctx->coded_height != s->height ||
1212 s1->save_width != s->width ||
1213 s1->save_height != s->height ||
1214 s1->save_aspect_info != s->aspect_ratio_info ||
1215 s1->save_progressive_seq != s->progressive_sequence ||
1216 0)
1217 {
1218
1219 if (s1->mpeg_enc_ctx_allocated) {
1220 ParseContext pc = s->parse_context;
1221 s->parse_context.buffer = 0;
1222 ff_MPV_common_end(s);
1223 s->parse_context = pc;
1224 }
1225
1226 if ((s->width == 0) || (s->height == 0))
1227 return -2;
1228
1229 avcodec_set_dimensions(avctx, s->width, s->height);
1230 avctx->bit_rate = s->bit_rate;
1231 s1->save_aspect_info = s->aspect_ratio_info;
1232 s1->save_width = s->width;
1233 s1->save_height = s->height;
1234 s1->save_progressive_seq = s->progressive_sequence;
1235
1236 /* low_delay may be forced, in this case we will have B-frames
1237 * that behave like P-frames. */
1238 avctx->has_b_frames = !s->low_delay;
1239
1240 if (avctx->codec_id == CODEC_ID_MPEG1VIDEO) {
1241 //MPEG-1 fps
1242 avctx->time_base.den = avpriv_frame_rate_tab[s->frame_rate_index].num;
1243 avctx->time_base.num = avpriv_frame_rate_tab[s->frame_rate_index].den;
1244 //MPEG-1 aspect
1245 avctx->sample_aspect_ratio = av_d2q(1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1246 avctx->ticks_per_frame=1;
1247 } else {//MPEG-2
1248 //MPEG-2 fps
1249 av_reduce(&s->avctx->time_base.den,
1250 &s->avctx->time_base.num,
1251 avpriv_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1252 avpriv_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1253 1 << 30);
1254 avctx->ticks_per_frame = 2;
1255 //MPEG-2 aspect
1256 if (s->aspect_ratio_info > 1) {
1257 AVRational dar =
1258 av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1259 (AVRational) {s1->pan_scan.width, s1->pan_scan.height}),
1260 (AVRational) {s->width, s->height});
1261
1262 // we ignore the spec here and guess a bit as reality does not match the spec, see for example
1263 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1264 // issue1613, 621, 562
1265 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1266 (av_cmp_q(dar, (AVRational) {4, 3}) && av_cmp_q(dar, (AVRational) {16, 9}))) {
1267 s->avctx->sample_aspect_ratio =
1268 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1269 (AVRational) {s->width, s->height});
1270 } else {
1271 s->avctx->sample_aspect_ratio =
1272 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1273 (AVRational) {s1->pan_scan.width, s1->pan_scan.height});
1274 //issue1613 4/3 16/9 -> 16/9
1275 //res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1276 //widescreen-issue562.mpg 4/3 16/9 -> 16/9
1277 // s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1278 //av_log(NULL, AV_LOG_ERROR, "A %d/%d\n", ff_mpeg2_aspect[s->aspect_ratio_info].num, ff_mpeg2_aspect[s->aspect_ratio_info].den);
1279 //av_log(NULL, AV_LOG_ERROR, "B %d/%d\n", s->avctx->sample_aspect_ratio.num, s->avctx->sample_aspect_ratio.den);
1280 }
1281 } else {
1282 s->avctx->sample_aspect_ratio =
1283 ff_mpeg2_aspect[s->aspect_ratio_info];
1284 }
1285 } // MPEG-2
1286
1287 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1288 avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1289 // until then pix_fmt may be changed right after codec init
1290 if (avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
1291 avctx->hwaccel ||
1292 s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)
1293 if (avctx->idct_algo == FF_IDCT_AUTO)
1294 avctx->idct_algo = FF_IDCT_SIMPLE;
1295
1296 /* Quantization matrices may need reordering
1297 * if DCT permutation is changed. */
1298 memcpy(old_permutation, s->dsp.idct_permutation, 64 * sizeof(uint8_t));
1299
1300 if (ff_MPV_common_init(s) < 0)
1301 return -2;
1302
1303 quant_matrix_rebuild(s->intra_matrix, old_permutation, s->dsp.idct_permutation);
1304 quant_matrix_rebuild(s->inter_matrix, old_permutation, s->dsp.idct_permutation);
1305 quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->dsp.idct_permutation);
1306 quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->dsp.idct_permutation);
1307
1308 s1->mpeg_enc_ctx_allocated = 1;
1309 }
1310 return 0;
1311 }
1312
1313 static int mpeg1_decode_picture(AVCodecContext *avctx,
1314 const uint8_t *buf, int buf_size)
1315 {
1316 Mpeg1Context *s1 = avctx->priv_data;
1317 MpegEncContext *s = &s1->mpeg_enc_ctx;
1318 int ref, f_code, vbv_delay;
1319
1320 init_get_bits(&s->gb, buf, buf_size*8);
1321
1322 ref = get_bits(&s->gb, 10); /* temporal ref */
1323 s->pict_type = get_bits(&s->gb, 3);
1324 if (s->pict_type == 0 || s->pict_type > 3)
1325 return -1;
1326
1327 vbv_delay = get_bits(&s->gb, 16);
1328 if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
1329 s->full_pel[0] = get_bits1(&s->gb);
1330 f_code = get_bits(&s->gb, 3);
1331 if (f_code == 0 && (avctx->err_recognition & AV_EF_BITSTREAM))
1332 return -1;
1333 s->mpeg_f_code[0][0] = f_code;
1334 s->mpeg_f_code[0][1] = f_code;
1335 }
1336 if (s->pict_type == AV_PICTURE_TYPE_B) {
1337 s->full_pel[1] = get_bits1(&s->gb);
1338 f_code = get_bits(&s->gb, 3);
1339 if (f_code == 0 && (avctx->err_recognition & AV_EF_BITSTREAM))
1340 return -1;
1341 s->mpeg_f_code[1][0] = f_code;
1342 s->mpeg_f_code[1][1] = f_code;
1343 }
1344 s->current_picture.f.pict_type = s->pict_type;
1345 s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1346
1347 if (avctx->debug & FF_DEBUG_PICT_INFO)
1348 av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1349
1350 s->y_dc_scale = 8;
1351 s->c_dc_scale = 8;
1352 return 0;
1353 }
1354
1355 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1356 {
1357 MpegEncContext *s= &s1->mpeg_enc_ctx;
1358 int horiz_size_ext, vert_size_ext;
1359 int bit_rate_ext;
1360
1361 skip_bits(&s->gb, 1); /* profile and level esc*/
1362 s->avctx->profile = get_bits(&s->gb, 3);
1363 s->avctx->level = get_bits(&s->gb, 4);
1364 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1365 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1366 horiz_size_ext = get_bits(&s->gb, 2);
1367 vert_size_ext = get_bits(&s->gb, 2);
1368 s->width |= (horiz_size_ext << 12);
1369 s->height |= (vert_size_ext << 12);
1370 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1371 s->bit_rate += (bit_rate_ext << 18) * 400;
1372 skip_bits1(&s->gb); /* marker */
1373 s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1374
1375 s->low_delay = get_bits1(&s->gb);
1376 if (s->flags & CODEC_FLAG_LOW_DELAY)
1377 s->low_delay = 1;
1378
1379 s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1380 s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1381
1382 av_dlog(s->avctx, "sequence extension\n");
1383 s->codec_id = s->avctx->codec_id = CODEC_ID_MPEG2VIDEO;
1384
1385 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1386 av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1387 s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1388
1389 }
1390
1391 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1392 {
1393 MpegEncContext *s = &s1->mpeg_enc_ctx;
1394 int color_description, w, h;
1395
1396 skip_bits(&s->gb, 3); /* video format */
1397 color_description = get_bits1(&s->gb);
1398 if (color_description) {
1399 s->avctx->color_primaries = get_bits(&s->gb, 8);
1400 s->avctx->color_trc = get_bits(&s->gb, 8);
1401 s->avctx->colorspace = get_bits(&s->gb, 8);
1402 }
1403 w = get_bits(&s->gb, 14);
1404 skip_bits(&s->gb, 1); //marker
1405 h = get_bits(&s->gb, 14);
1406 // remaining 3 bits are zero padding
1407
1408 s1->pan_scan.width = 16 * w;
1409 s1->pan_scan.height = 16 * h;
1410
1411 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1412 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1413 }
1414
1415 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1416 {
1417 MpegEncContext *s = &s1->mpeg_enc_ctx;
1418 int i, nofco;
1419
1420 nofco = 1;
1421 if (s->progressive_sequence) {
1422 if (s->repeat_first_field) {
1423 nofco++;
1424 if (s->top_field_first)
1425 nofco++;
1426 }
1427 } else {
1428 if (s->picture_structure == PICT_FRAME) {
1429 nofco++;
1430 if (s->repeat_first_field)
1431 nofco++;
1432 }
1433 }
1434 for (i = 0; i < nofco; i++) {
1435 s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1436 skip_bits(&s->gb, 1); // marker
1437 s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1438 skip_bits(&s->gb, 1); // marker
1439 }
1440
1441 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1442 av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1443 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1444 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1445 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1446 }
1447
1448 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra)
1449 {
1450 int i;
1451
1452 for (i = 0; i < 64; i++) {
1453 int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1454 int v = get_bits(&s->gb, 8);
1455 if (v == 0) {
1456 av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1457 return -1;
1458 }
1459 if (intra && i == 0 && v != 8) {
1460 av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
1461 v = 8; // needed by pink.mpg / issue1046
1462 }
1463 matrix0[j] = v;
1464 if (matrix1)
1465 matrix1[j] = v;
1466 }
1467 return 0;
1468 }
1469
1470 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1471 {
1472 av_dlog(s->avctx, "matrix extension\n");
1473
1474 if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1475 if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1476 if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL , 1);
1477 if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL , 0);
1478 }
1479
1480 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1481 {
1482 MpegEncContext *s = &s1->mpeg_enc_ctx;
1483
1484 s->full_pel[0] = s->full_pel[1] = 0;
1485 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1486 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1487 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1488 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1489 if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1490 av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1491 if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1492 if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1493 s->pict_type = AV_PICTURE_TYPE_I;
1494 else
1495 s->pict_type = AV_PICTURE_TYPE_P;
1496 } else
1497 s->pict_type = AV_PICTURE_TYPE_B;
1498 s->current_picture.f.pict_type = s->pict_type;
1499 s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1500 }
1501 s->intra_dc_precision = get_bits(&s->gb, 2);
1502 s->picture_structure = get_bits(&s->gb, 2);
1503 s->top_field_first = get_bits1(&s->gb);
1504 s->frame_pred_frame_dct = get_bits1(&s->gb);
1505 s->concealment_motion_vectors = get_bits1(&s->gb);
1506 s->q_scale_type = get_bits1(&s->gb);
1507 s->intra_vlc_format = get_bits1(&s->gb);
1508 s->alternate_scan = get_bits1(&s->gb);
1509 s->repeat_first_field = get_bits1(&s->gb);
1510 s->chroma_420_type = get_bits1(&s->gb);
1511 s->progressive_frame = get_bits1(&s->gb);
1512
1513 if (s->progressive_sequence && !s->progressive_frame) {
1514 s->progressive_frame = 1;
1515 av_log(s->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
1516 }
1517
1518 if (s->picture_structure == 0 || (s->progressive_frame && s->picture_structure != PICT_FRAME)) {
1519 av_log(s->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s->picture_structure);
1520 s->picture_structure = PICT_FRAME;
1521 }
1522
1523 if (s->progressive_sequence && !s->frame_pred_frame_dct) {
1524 av_log(s->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
1525 }
1526
1527 if (s->picture_structure == PICT_FRAME) {
1528 s->first_field = 0;
1529 s->v_edge_pos = 16 * s->mb_height;
1530 } else {
1531 s->first_field ^= 1;
1532 s->v_edge_pos = 8 * s->mb_height;
1533 memset(s->mbskip_table, 0, s->mb_stride * s->mb_height);
1534 }
1535
1536 if (s->alternate_scan) {
1537 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1538 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1539 } else {
1540 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1541 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1542 }
1543
1544 /* composite display not parsed */
1545 av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1546 av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1547 av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1548 av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1549 av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1550 av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1551 av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1552 av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1553 av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1554 }
1555
1556 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1557 {
1558 AVCodecContext *avctx = s->avctx;
1559 Mpeg1Context *s1 = (Mpeg1Context*)s;
1560
1561 /* start frame decoding */
1562 if (s->first_field || s->picture_structure == PICT_FRAME) {
1563 if (ff_MPV_frame_start(s, avctx) < 0)
1564 return -1;
1565
1566 ff_er_frame_start(s);
1567
1568 /* first check if we must repeat the frame */
1569 s->current_picture_ptr->f.repeat_pict = 0;
1570 if (s->repeat_first_field) {
1571 if (s->progressive_sequence) {
1572 if (s->top_field_first)
1573 s->current_picture_ptr->f.repeat_pict = 4;
1574 else
1575 s->current_picture_ptr->f.repeat_pict = 2;
1576 } else if (s->progressive_frame) {
1577 s->current_picture_ptr->f.repeat_pict = 1;
1578 }
1579 }
1580
1581 *s->current_picture_ptr->f.pan_scan = s1->pan_scan;
1582
1583 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1584 ff_thread_finish_setup(avctx);
1585 } else { // second field
1586 int i;
1587
1588 if (!s->current_picture_ptr) {
1589 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1590 return -1;
1591 }
1592
1593 for (i = 0; i < 4; i++) {
1594 s->current_picture.f.data[i] = s->current_picture_ptr->f.data[i];
1595 if (s->picture_structure == PICT_BOTTOM_FIELD) {
1596 s->current_picture.f.data[i] += s->current_picture_ptr->f.linesize[i];
1597 }
1598 }
1599 }
1600
1601 if (avctx->hwaccel) {
1602 if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1603 return -1;
1604 }
1605
1606 // MPV_frame_start will call this function too,
1607 // but we need to call it on every field
1608 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1609 if (ff_xvmc_field_start(s, avctx) < 0)
1610 return -1;
1611
1612 return 0;
1613 }
1614
1615 #define DECODE_SLICE_ERROR -1
1616 #define DECODE_SLICE_OK 0
1617
1618 /**
1619 * Decode a slice.
1620 * MpegEncContext.mb_y must be set to the MB row from the startcode.
1621 * @return DECODE_SLICE_ERROR if the slice is damaged,
1622 * DECODE_SLICE_OK if this slice is OK
1623 */
1624 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1625 const uint8_t **buf, int buf_size)
1626 {
1627 AVCodecContext *avctx = s->avctx;
1628 const int lowres = s->avctx->lowres;
1629 const int field_pic = s->picture_structure != PICT_FRAME;
1630
1631 s->resync_mb_x =
1632 s->resync_mb_y = -1;
1633
1634 assert(mb_y < s->mb_height);
1635
1636 init_get_bits(&s->gb, *buf, buf_size * 8);
1637
1638 ff_mpeg1_clean_buffers(s);
1639 s->interlaced_dct = 0;
1640
1641 s->qscale = get_qscale(s);
1642
1643 if (s->qscale == 0) {
1644 av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1645 return -1;
1646 }
1647
1648 /* extra slice info */
1649 while (get_bits1(&s->gb) != 0) {
1650 skip_bits(&s->gb, 8);
1651 }
1652
1653 s->mb_x = 0;
1654
1655 if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1656 skip_bits1(&s->gb);
1657 } else {
1658 while (get_bits_left(&s->gb) > 0) {
1659 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1660 if (code < 0) {
1661 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1662 return -1;
1663 }
1664 if (code >= 33) {
1665 if (code == 33) {
1666 s->mb_x += 33;
1667 }
1668 /* otherwise, stuffing, nothing to do */
1669 } else {
1670 s->mb_x += code;
1671 break;
1672 }
1673 }
1674 }
1675
1676 if (s->mb_x >= (unsigned)s->mb_width) {
1677 av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1678 return -1;
1679 }
1680
1681 if (avctx->hwaccel) {
1682 const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1683 int start_code = -1;
1684 buf_end = avpriv_mpv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1685 if (buf_end < *buf + buf_size)
1686 buf_end -= 4;
1687 s->mb_y = mb_y;
1688 if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1689 return DECODE_SLICE_ERROR;
1690 *buf = buf_end;
1691 return DECODE_SLICE_OK;
1692 }
1693
1694 s->resync_mb_x = s->mb_x;
1695 s->resync_mb_y = s->mb_y = mb_y;
1696 s->mb_skip_run = 0;
1697 ff_init_block_index(s);
1698
1699 if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1700 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1701 av_log(s->avctx, AV_LOG_DEBUG, "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",
1702 s->qscale, s->mpeg_f_code[0][0], s->mpeg_f_code[0][1], s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1703 s->pict_type == AV_PICTURE_TYPE_I ? "I" : (s->pict_type == AV_PICTURE_TYPE_P ? "P" : (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1704 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1705 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1706 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1707 }
1708 }
1709
1710 for (;;) {
1711 // If 1, we memcpy blocks in xvmcvideo.
1712 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1713 ff_xvmc_init_block(s); // set s->block
1714
1715 if (mpeg_decode_mb(s, s->block) < 0)
1716 return -1;
1717
1718 if (s->current_picture.f.motion_val[0] && !s->encoding) { // note motion_val is normally NULL unless we want to extract the MVs
1719 const int wrap = s->b8_stride;
1720 int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1721 int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1722 int motion_x, motion_y, dir, i;
1723
1724 for (i = 0; i < 2; i++) {
1725 for (dir = 0; dir < 2; dir++) {
1726 if (s->mb_intra || (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1727 motion_x = motion_y = 0;
1728 } else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1729 motion_x = s->mv[dir][0][0];
1730 motion_y = s->mv[dir][0][1];
1731 } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1732 motion_x = s->mv[dir][i][0];
1733 motion_y = s->mv[dir][i][1];
1734 }
1735
1736 s->current_picture.f.motion_val[dir][xy ][0] = motion_x;
1737 s->current_picture.f.motion_val[dir][xy ][1] = motion_y;
1738 s->current_picture.f.motion_val[dir][xy + 1][0] = motion_x;
1739 s->current_picture.f.motion_val[dir][xy + 1][1] = motion_y;
1740 s->current_picture.f.ref_index [dir][b8_xy ] =
1741 s->current_picture.f.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1742 assert(s->field_select[dir][i] == 0 || s->field_select[dir][i] == 1);
1743 }
1744 xy += wrap;
1745 b8_xy +=2;
1746 }
1747 }
1748
1749 s->dest[0] += 16 >> lowres;
1750 s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1751 s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1752
1753 ff_MPV_decode_mb(s, s->block);
1754
1755 if (++s->mb_x >= s->mb_width) {
1756 const int mb_size = 16 >> s->avctx->lowres;
1757
1758 ff_draw_horiz_band(s, mb_size*(s->mb_y >> field_pic), mb_size);
1759 ff_MPV_report_decode_progress(s);
1760
1761 s->mb_x = 0;
1762 s->mb_y += 1 << field_pic;
1763
1764 if (s->mb_y >= s->mb_height) {
1765 int left = get_bits_left(&s->gb);
1766 int is_d10 = s->chroma_format == 2 && s->pict_type == AV_PICTURE_TYPE_I && avctx->profile == 0 && avctx->level == 5
1767 && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1768 && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1769
1770 if (left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1771 || ((avctx->err_recognition & AV_EF_BUFFER) && left > 8)) {
1772 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1773 return -1;
1774 } else
1775 goto eos;
1776 }
1777
1778 ff_init_block_index(s);
1779 }
1780
1781 /* skip mb handling */
1782 if (s->mb_skip_run == -1) {
1783 /* read increment again */
1784 s->mb_skip_run = 0;
1785 for (;;) {
1786 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1787 if (code < 0) {
1788 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1789 return -1;
1790 }
1791 if (code >= 33) {
1792 if (code == 33) {
1793 s->mb_skip_run += 33;
1794 } else if (code == 35) {
1795 if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1796 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1797 return -1;
1798 }
1799 goto eos; /* end of slice */
1800 }
1801 /* otherwise, stuffing, nothing to do */
1802 } else {
1803 s->mb_skip_run += code;
1804 break;
1805 }
1806 }
1807 if (s->mb_skip_run) {
1808 int i;
1809 if (s->pict_type == AV_PICTURE_TYPE_I) {
1810 av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1811 return -1;
1812 }
1813
1814 /* skip mb */
1815 s->mb_intra = 0;
1816 for (i = 0; i < 12; i++)
1817 s->block_last_index[i] = -1;
1818 if (s->picture_structure == PICT_FRAME)
1819 s->mv_type = MV_TYPE_16X16;
1820 else
1821 s->mv_type = MV_TYPE_FIELD;
1822 if (s->pict_type == AV_PICTURE_TYPE_P) {
1823 /* if P type, zero motion vector is implied */
1824 s->mv_dir = MV_DIR_FORWARD;
1825 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1826 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1827 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1828 s->field_select[0][0] = (s->picture_structure - 1) & 1;
1829 } else {
1830 /* if B type, reuse previous vectors and directions */
1831 s->mv[0][0][0] = s->last_mv[0][0][0];
1832 s->mv[0][0][1] = s->last_mv[0][0][1];
1833 s->mv[1][0][0] = s->last_mv[1][0][0];
1834 s->mv[1][0][1] = s->last_mv[1][0][1];
1835 }
1836 }
1837 }
1838 }
1839 eos: // end of slice
1840 *buf += (get_bits_count(&s->gb)-1)/8;
1841 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1842 return 0;
1843 }
1844
1845 static int slice_decode_thread(AVCodecContext *c, void *arg)
1846 {
1847 MpegEncContext *s = *(void**)arg;
1848 const uint8_t *buf = s->gb.buffer;
1849 int mb_y = s->start_mb_y;
1850 const int field_pic = s->picture_structure != PICT_FRAME;
1851
1852 s->error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1853
1854 for (;;) {
1855 uint32_t start_code;
1856 int ret;
1857
1858 ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1859 emms_c();
1860 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1861 //ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, s->start_mb_y, s->end_mb_y, s->error_count);
1862 if (ret < 0) {
1863 if (c->err_recognition & AV_EF_EXPLODE)
1864 return ret;
1865 if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1866 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
1867 } else {
1868 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_AC_END | ER_DC_END | ER_MV_END);
1869 }
1870
1871 if (s->mb_y == s->end_mb_y)
1872 return 0;
1873
1874 start_code = -1;
1875 buf = avpriv_mpv_find_start_code(buf, s->gb.buffer_end, &start_code);
1876 mb_y= (start_code - SLICE_MIN_START_CODE) << field_pic;
1877 if (s->picture_structure == PICT_BOTTOM_FIELD)
1878 mb_y++;
1879 if (mb_y < 0 || mb_y >= s->end_mb_y)
1880 return -1;
1881 }
1882 }
1883
1884 /**
1885 * Handle slice ends.
1886 * @return 1 if it seems to be the last slice
1887 */
1888 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1889 {
1890 Mpeg1Context *s1 = avctx->priv_data;
1891 MpegEncContext *s = &s1->mpeg_enc_ctx;
1892
1893 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1894 return 0;
1895
1896 if (s->avctx->hwaccel) {
1897 if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1898 av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1899 }
1900
1901 if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1902 ff_xvmc_field_end(s);
1903
1904 /* end of slice reached */
1905 if (/*s->mb_y << field_pic == s->mb_height &&*/ !s->first_field) {
1906 /* end of image */
1907
1908 s->current_picture_ptr->f.qscale_type = FF_QSCALE_TYPE_MPEG2;
1909
1910 ff_er_frame_end(s);
1911
1912 ff_MPV_frame_end(s);
1913
1914 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
1915 *pict = s->current_picture_ptr->f;
1916 ff_print_debug_info(s, pict);
1917 } else {
1918 if (avctx->active_thread_type & FF_THREAD_FRAME)
1919 s->picture_number++;
1920 /* latency of 1 frame for I- and P-frames */
1921 /* XXX: use another variable than picture_number */
1922 if (s->last_picture_ptr != NULL) {
1923 *pict = s->last_picture_ptr->f;
1924 ff_print_debug_info(s, pict);
1925 }
1926 }
1927
1928 return 1;
1929 } else {
1930 return 0;
1931 }
1932 }
1933
1934 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1935 const uint8_t *buf, int buf_size)
1936 {
1937 Mpeg1Context *s1 = avctx->priv_data;
1938 MpegEncContext *s = &s1->mpeg_enc_ctx;
1939 int width, height;
1940 int i, v, j;
1941
1942 init_get_bits(&s->gb, buf, buf_size*8);
1943
1944 width = get_bits(&s->gb, 12);
1945 height = get_bits(&s->gb, 12);
1946 if (width <= 0 || height <= 0)
1947 return -1;
1948 s->aspect_ratio_info = get_bits(&s->gb, 4);
1949 if (s->aspect_ratio_info == 0) {
1950 av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1951 if (avctx->err_recognition & AV_EF_BITSTREAM)
1952 return -1;
1953 }
1954 s->frame_rate_index = get_bits(&s->gb, 4);
1955 if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1956 return -1;
1957 s->bit_rate = get_bits(&s->gb, 18) * 400;
1958 if (get_bits1(&s->gb) == 0) /* marker */
1959 return -1;
1960 s->width = width;
1961 s->height = height;
1962
1963 s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
1964 skip_bits(&s->gb, 1);
1965
1966 /* get matrix */
1967 if (get_bits1(&s->gb)) {
1968 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1969 } else {
1970 for (i = 0; i < 64; i++) {
1971 j = s->dsp.idct_permutation[i];
1972 v = ff_mpeg1_default_intra_matrix[i];
1973 s->intra_matrix[j] = v;
1974 s->chroma_intra_matrix[j] = v;
1975 }
1976 }
1977 if (get_bits1(&s->gb)) {
1978 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1979 } else {
1980 for (i = 0; i < 64; i++) {
1981 int j = s->dsp.idct_permutation[i];
1982 v = ff_mpeg1_default_non_intra_matrix[i];
1983 s->inter_matrix[j] = v;
1984 s->chroma_inter_matrix[j] = v;
1985 }
1986 }
1987
1988 if (show_bits(&s->gb, 23) != 0) {
1989 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
1990 return -1;
1991 }
1992
1993 /* we set MPEG-2 parameters so that it emulates MPEG-1 */
1994 s->progressive_sequence = 1;
1995 s->progressive_frame = 1;
1996 s->picture_structure = PICT_FRAME;
1997 s->frame_pred_frame_dct = 1;
1998 s->chroma_format = 1;
1999 s->codec_id = s->avctx->codec_id = CODEC_ID_MPEG1VIDEO;
2000 s->out_format = FMT_MPEG1;
2001 s->swap_uv = 0; // AFAIK VCR2 does not have SEQ_HEADER
2002 if (s->flags & CODEC_FLAG_LOW_DELAY)
2003 s->low_delay = 1;
2004
2005 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2006 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2007 s->avctx->rc_buffer_size, s->bit_rate);
2008
2009 return 0;
2010 }
2011
2012 static int vcr2_init_sequence(AVCodecContext *avctx)
2013 {
2014 Mpeg1Context *s1 = avctx->priv_data;
2015 MpegEncContext *s = &s1->mpeg_enc_ctx;
2016 int i, v;
2017
2018 /* start new MPEG-1 context decoding */
2019 s->out_format = FMT_MPEG1;
2020 if (s1->mpeg_enc_ctx_allocated) {
2021 ff_MPV_common_end(s);
2022 }
2023 s->width = avctx->coded_width;
2024 s->height = avctx->coded_height;
2025 avctx->has_b_frames = 0; // true?
2026 s->low_delay = 1;
2027
2028 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2029 avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2030
2031 if (avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel ||
2032 s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)
2033 if (avctx->idct_algo == FF_IDCT_AUTO)
2034 avctx->idct_algo = FF_IDCT_SIMPLE;
2035
2036 if (ff_MPV_common_init(s) < 0)
2037 return -1;
2038 exchange_uv(s); // common init reset pblocks, so we swap them here
2039 s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2040 s1->mpeg_enc_ctx_allocated = 1;
2041
2042 for (i = 0; i < 64; i++) {
2043 int j = s->dsp.idct_permutation[i];
2044 v = ff_mpeg1_default_intra_matrix[i];
2045 s->intra_matrix[j] = v;
2046 s->chroma_intra_matrix[j] = v;
2047
2048 v = ff_mpeg1_default_non_intra_matrix[i];
2049 s->inter_matrix[j] = v;
2050 s->chroma_inter_matrix[j] = v;
2051 }
2052
2053 s->progressive_sequence = 1;
2054 s->progressive_frame = 1;
2055 s->picture_structure = PICT_FRAME;
2056 s->frame_pred_frame_dct = 1;
2057 s->chroma_format = 1;
2058 s->codec_id = s->avctx->codec_id = CODEC_ID_MPEG2VIDEO;
2059 s1->save_width = s->width;
2060 s1->save_height = s->height;
2061 s1->save_progressive_seq = s->progressive_sequence;
2062 return 0;
2063 }
2064
2065
2066 static void mpeg_decode_user_data(AVCodecContext *avctx,
2067 const uint8_t *p, int buf_size)
2068 {
2069 const uint8_t *buf_end = p + buf_size;
2070
2071 /* we parse the DTG active format information */
2072 if (buf_end - p >= 5 &&
2073 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2074 int flags = p[4];
2075 p += 5;
2076 if (flags & 0x80) {
2077 /* skip event id */
2078 p += 2;
2079 }
2080 if (flags & 0x40) {
2081 if (buf_end - p < 1)
2082 return;
2083 avctx->dtg_active_format = p[0] & 0x0f;
2084 }
2085 }
2086 }
2087
2088 static void mpeg_decode_gop(AVCodecContext *avctx,
2089 const uint8_t *buf, int buf_size)
2090 {
2091 Mpeg1Context *s1 = avctx->priv_data;
2092 MpegEncContext *s = &s1->mpeg_enc_ctx;
2093
2094 int time_code_hours, time_code_minutes;
2095 int time_code_seconds, time_code_pictures;
2096 int broken_link;
2097
2098 init_get_bits(&s->gb, buf, buf_size*8);
2099
2100 skip_bits1(&s->gb); /* drop_frame_flag */
2101
2102 time_code_hours = get_bits(&s->gb, 5);
2103 time_code_minutes = get_bits(&s->gb, 6);
2104 skip_bits1(&s->gb); // marker bit
2105 time_code_seconds = get_bits(&s->gb, 6);
2106 time_code_pictures = get_bits(&s->gb, 6);
2107
2108 s1->closed_gop = get_bits1(&s->gb);
2109 /*broken_link indicate that after editing the
2110 reference frames of the first B-Frames after GOP I-Frame
2111 are missing (open gop)*/
2112 broken_link = get_bits1(&s->gb);
2113
2114 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2115 av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2116 time_code_hours, time_code_minutes, time_code_seconds,
2117 time_code_pictures, s1->closed_gop, broken_link);
2118 }
2119 /**
2120 * Find the end of the current frame in the bitstream.
2121 * @return the position of the first byte of the next frame, or -1
2122 */
2123 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2124 {
2125 int i;
2126 uint32_t state = pc->state;
2127
2128 /* EOF considered as end of frame */
2129 if (buf_size == 0)
2130 return 0;
2131
2132 /*
2133 0 frame start -> 1/4
2134 1 first_SEQEXT -> 0/2
2135 2 first field start -> 3/0
2136 3 second_SEQEXT -> 2/0
2137 4 searching end
2138 */
2139
2140 for (i = 0; i < buf_size; i++) {
2141 assert(pc->frame_start_found >= 0 && pc->frame_start_found <= 4);
2142 if (pc->frame_start_found & 1) {
2143 if (state == EXT_START_CODE && (buf[i] & 0xF0) != 0x80)
2144 pc->frame_start_found--;
2145 else if (state == EXT_START_CODE + 2) {
2146 if ((buf[i] & 3) == 3)
2147 pc->frame_start_found = 0;
2148 else
2149 pc->frame_start_found = (pc->frame_start_found + 1) & 3;
2150 }
2151 state++;
2152 } else {
2153 i = avpriv_mpv_find_start_code(buf + i, buf + buf_size, &state) - buf - 1;
2154 if (pc->frame_start_found == 0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE) {
2155 i++;
2156 pc->frame_start_found = 4;
2157 }
2158 if (state == SEQ_END_CODE) {
2159 pc->state=-1;
2160 return i+1;
2161 }
2162 if (pc->frame_start_found == 2 && state == SEQ_START_CODE)
2163 pc->frame_start_found = 0;
2164 if (pc->frame_start_found < 4 && state == EXT_START_CODE)
2165 pc->frame_start_found++;
2166 if (pc->frame_start_found == 4 && (state & 0xFFFFFF00) == 0x100) {
2167 if (state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE) {
2168 pc->frame_start_found = 0;
2169 pc->state = -1;
2170 return i - 3;
2171 }
2172 }
2173 if (pc->frame_start_found == 0 && s && state == PICTURE_START_CODE) {
2174 ff_fetch_timestamp(s, i - 3, 1);
2175 }
2176 }
2177 }
2178 pc->state = state;
2179 return END_NOT_FOUND;
2180 }
2181
2182 static int decode_chunks(AVCodecContext *avctx,
2183 AVFrame *picture, int *data_size,
2184 const uint8_t *buf, int buf_size);
2185
2186 /* handle buffering and image synchronisation */
2187 static int mpeg_decode_frame(AVCodecContext *avctx,
2188 void *data, int *data_size,
2189 AVPacket *avpkt)
2190 {
2191 const uint8_t *buf = avpkt->data;
2192 int buf_size = avpkt->size;
2193 Mpeg1Context *s = avctx->priv_data;
2194 AVFrame *picture = data;
2195 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2196 av_dlog(avctx, "fill_buffer\n");
2197
2198 if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2199 /* special case for last picture */
2200 if (s2->low_delay == 0 && s2->next_picture_ptr) {
2201 *picture = s2->next_picture_ptr->f;
2202 s2->next_picture_ptr = NULL;
2203
2204 *data_size = sizeof(AVFrame);
2205 }
2206 return buf_size;
2207 }
2208
2209 if (s2->flags & CODEC_FLAG_TRUNCATED) {
2210 int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2211
2212 if (ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0)
2213 return buf_size;
2214 }
2215
2216 if (s->mpeg_enc_ctx_allocated == 0 && avctx->codec_tag == AV_RL32("VCR2"))
2217 vcr2_init_sequence(avctx);
2218
2219 s->slice_count = 0;
2220
2221 if (avctx->extradata && !avctx->frame_number) {
2222 int ret = decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2223 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
2224 return ret;
2225 }
2226
2227 return decode_chunks(avctx, picture, data_size, buf, buf_size);
2228 }
2229
2230 static int decode_chunks(AVCodecContext *avctx,
2231 AVFrame *picture, int *data_size,
2232 const uint8_t *buf, int buf_size)
2233 {
2234 Mpeg1Context *s = avctx->priv_data;
2235 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2236 const uint8_t *buf_ptr = buf;
2237 const uint8_t *buf_end = buf + buf_size;
2238 int ret, input_size;
2239 int last_code = 0;
2240
2241 for (;;) {
2242 /* find next start code */
2243 uint32_t start_code = -1;
2244 buf_ptr = avpriv_mpv_find_start_code(buf_ptr, buf_end, &start_code);
2245 if (start_code > 0x1ff) {
2246 if (s2->pict_type != AV_PICTURE_TYPE_B || avctx->skip_frame <= AVDISCARD_DEFAULT) {
2247 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2248 int i;
2249
2250 avctx->execute(avctx, slice_decode_thread, &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
2251 for (i = 0; i < s->slice_count; i++)
2252 s2->error_count += s2->thread_context[i]->error_count;
2253 }
2254
2255 if (CONFIG_MPEG_VDPAU_DECODER && avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)
2256 ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2257
2258 if (slice_end(avctx, picture)) {
2259 if (s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2260 *data_size = sizeof(AVPicture);
2261 }
2262 }
2263 s2->pict_type = 0;
2264 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2265 }
2266
2267 input_size = buf_end - buf_ptr;
2268
2269 if (avctx->debug & FF_DEBUG_STARTCODE) {
2270 av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2271 }
2272
2273 /* prepare data for next start code */
2274 switch (start_code) {
2275 case SEQ_START_CODE:
2276 if (last_code == 0) {
2277 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2278 s->sync=1;
2279 } else {
2280 av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2281 if (avctx->err_recognition & AV_EF_EXPLODE)
2282 return AVERROR_INVALIDDATA;
2283 }
2284 break;
2285
2286 case PICTURE_START_CODE:
2287 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) && s->slice_count) {
2288 int i;
2289
2290 avctx->execute(avctx, slice_decode_thread,
2291 s2->thread_context, NULL,
2292 s->slice_count, sizeof(void*));
2293 for (i = 0; i < s->slice_count; i++)
2294 s2->error_count += s2->thread_context[i]->error_count;
2295 s->slice_count = 0;
2296 }
2297 if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2298 ret = mpeg_decode_postinit(avctx);
2299 if (ret < 0) {
2300 av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
2301 return ret;
2302 }
2303
2304 /* we have a complete image: we try to decompress it */
2305 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2306 s2->pict_type = 0;
2307 s2->first_slice = 1;
2308 last_code = PICTURE_START_CODE;
2309 } else {
2310 av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
2311 if (avctx->err_recognition & AV_EF_EXPLODE)
2312 return AVERROR_INVALIDDATA;
2313 }
2314 break;
2315 case EXT_START_CODE:
2316 init_get_bits(&s2->gb, buf_ptr, input_size*8);
2317
2318 switch (get_bits(&s2->gb, 4)) {
2319 case 0x1:
2320 if (last_code == 0) {
2321 mpeg_decode_sequence_extension(s);
2322 } else {
2323 av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
2324 if (avctx->err_recognition & AV_EF_EXPLODE)
2325 return AVERROR_INVALIDDATA;
2326 }
2327 break;
2328 case 0x2:
2329 mpeg_decode_sequence_display_extension(s);
2330 break;
2331 case 0x3:
2332 mpeg_decode_quant_matrix_extension(s2);
2333 break;
2334 case 0x7:
2335 mpeg_decode_picture_display_extension(s);
2336 break;
2337 case 0x8:
2338 if (last_code == PICTURE_START_CODE) {
2339 mpeg_decode_picture_coding_extension(s);
2340 } else {
2341 av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
2342 if (avctx->err_recognition & AV_EF_EXPLODE)
2343 return AVERROR_INVALIDDATA;
2344 }
2345 break;
2346 }
2347 break;
2348 case USER_START_CODE:
2349 mpeg_decode_user_data(avctx, buf_ptr, input_size);
2350 break;
2351 case GOP_START_CODE:
2352 if (last_code == 0) {
2353 s2->first_field=0;
2354 mpeg_decode_gop(avctx, buf_ptr, input_size);
2355 s->sync=1;
2356 } else {
2357 av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
2358 if (avctx->err_recognition & AV_EF_EXPLODE)
2359 return AVERROR_INVALIDDATA;
2360 }
2361 break;
2362 default:
2363 if (start_code >= SLICE_MIN_START_CODE &&
2364 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2365 const int field_pic = s2->picture_structure != PICT_FRAME;
2366 int mb_y = (start_code - SLICE_MIN_START_CODE) << field_pic;
2367 last_code = SLICE_MIN_START_CODE;
2368
2369 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2370 mb_y++;
2371
2372 if (mb_y >= s2->mb_height) {
2373 av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2374 return -1;
2375 }
2376
2377 if (s2->last_picture_ptr == NULL) {
2378 /* Skip B-frames if we do not have reference frames and gop is not closed */
2379 if (s2->pict_type == AV_PICTURE_TYPE_B) {
2380 if (!s->closed_gop)
2381 break;
2382 }
2383 }
2384 if (s2->pict_type == AV_PICTURE_TYPE_I)
2385 s->sync=1;
2386 if (s2->next_picture_ptr == NULL) {
2387 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2388 if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) break;
2389 }
2390 if ((avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type == AV_PICTURE_TYPE_B) ||
2391 (avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type != AV_PICTURE_TYPE_I) ||
2392 avctx->skip_frame >= AVDISCARD_ALL)
2393 break;
2394
2395 if (!s->mpeg_enc_ctx_allocated)
2396 break;
2397
2398 if (s2->codec_id == CODEC_ID_MPEG2VIDEO) {
2399 if (mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2400 break;
2401 }
2402
2403 if (!s2->pict_type) {
2404 av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2405 if (avctx->err_recognition & AV_EF_EXPLODE)
2406 return AVERROR_INVALIDDATA;
2407 break;
2408 }
2409
2410 if (s2->first_slice) {
2411 s2->first_slice = 0;
2412 if (mpeg_field_start(s2, buf, buf_size) < 0)
2413 return -1;
2414 }
2415 if (!s2->current_picture_ptr) {
2416 av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2417 return AVERROR_INVALIDDATA;
2418 }
2419
2420 if (avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU) {
2421 s->slice_count++;
2422 break;
2423 }
2424
2425 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2426 int threshold = (s2->mb_height * s->slice_count +
2427 s2->slice_context_count / 2) /
2428 s2->slice_context_count;
2429 if (threshold <= mb_y) {
2430 MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2431
2432 thread_context->start_mb_y = mb_y;
2433 thread_context->end_mb_y = s2->mb_height;
2434 if (s->slice_count) {
2435 s2->thread_context[s->slice_count-1]->end_mb_y = mb_y;
2436 ff_update_duplicate_context(thread_context, s2);
2437 }
2438 init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2439 s->slice_count++;
2440 }
2441 buf_ptr += 2; // FIXME add minimum number of bytes per slice
2442 } else {
2443 ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2444 emms_c();
2445
2446 if (ret < 0) {
2447 if (avctx->err_recognition & AV_EF_EXPLODE)
2448 return ret;
2449 if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2450 ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2451 } else {
2452 ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x-1, s2->mb_y, ER_AC_END | ER_DC_END | ER_MV_END);
2453 }
2454 }
2455 }
2456 break;
2457 }
2458 }
2459 }
2460
2461 static void flush(AVCodecContext *avctx)
2462 {
2463 Mpeg1Context *s = avctx->priv_data;
2464
2465 s->sync=0;
2466 s->closed_gop = 0;
2467
2468 ff_mpeg_flush(avctx);
2469 }
2470
2471 static int mpeg_decode_end(AVCodecContext *avctx)
2472 {
2473 Mpeg1Context *s = avctx->priv_data;
2474
2475 if (s->mpeg_enc_ctx_allocated)
2476 ff_MPV_common_end(&s->mpeg_enc_ctx);
2477 return 0;
2478 }
2479
2480 static const AVProfile mpeg2_video_profiles[] = {
2481 { FF_PROFILE_MPEG2_422, "4:2:2" },
2482 { FF_PROFILE_MPEG2_HIGH, "High" },
2483 { FF_PROFILE_MPEG2_SS, "Spatially Scalable" },
2484 { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable" },
2485 { FF_PROFILE_MPEG2_MAIN, "Main" },
2486 { FF_PROFILE_MPEG2_SIMPLE, "Simple" },
2487 { FF_PROFILE_RESERVED, "Reserved" },
2488 { FF_PROFILE_RESERVED, "Reserved" },
2489 { FF_PROFILE_UNKNOWN },
2490 };
2491
2492
2493 AVCodec ff_mpeg1video_decoder = {
2494 .name = "mpeg1video",
2495 .type = AVMEDIA_TYPE_VIDEO,
2496 .id = CODEC_ID_MPEG1VIDEO,
2497 .priv_data_size = sizeof(Mpeg1Context),
2498 .init = mpeg_decode_init,
2499 .close = mpeg_decode_end,
2500 .decode = mpeg_decode_frame,
2501 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2502 .flush = flush,
2503 .max_lowres = 3,
2504 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2505 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2506 };
2507
2508 AVCodec ff_mpeg2video_decoder = {
2509 .name = "mpeg2video",
2510 .type = AVMEDIA_TYPE_VIDEO,
2511 .id = CODEC_ID_MPEG2VIDEO,
2512 .priv_data_size = sizeof(Mpeg1Context),
2513 .init = mpeg_decode_init,
2514 .close = mpeg_decode_end,
2515 .decode = mpeg_decode_frame,
2516 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2517 .flush = flush,
2518 .max_lowres = 3,
2519 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2520 .profiles = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2521 };
2522
2523 #if CONFIG_MPEG_XVMC_DECODER
2524 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2525 {
2526 if (avctx->active_thread_type & FF_THREAD_SLICE)
2527 return -1;
2528 if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2529 return -1;
2530 if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2531 av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2532 }
2533 mpeg_decode_init(avctx);
2534
2535 avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2536 avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2537
2538 return 0;
2539 }
2540
2541 AVCodec ff_mpeg_xvmc_decoder = {
2542 .name = "mpegvideo_xvmc",
2543 .type = AVMEDIA_TYPE_VIDEO,
2544 .id = CODEC_ID_MPEG2VIDEO_XVMC,
2545 .priv_data_size = sizeof(Mpeg1Context),
2546 .init = mpeg_mc_decode_init,
2547 .close = mpeg_decode_end,
2548 .decode = mpeg_decode_frame,
2549 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2550 .flush = flush,
2551 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2552 };
2553
2554 #endif
2555
2556 #if CONFIG_MPEG_VDPAU_DECODER
2557 AVCodec ff_mpeg_vdpau_decoder = {
2558 .name = "mpegvideo_vdpau",
2559 .type = AVMEDIA_TYPE_VIDEO,
2560 .id = CODEC_ID_MPEG2VIDEO,
2561 .priv_data_size = sizeof(Mpeg1Context),
2562 .init = mpeg_decode_init,
2563 .close = mpeg_decode_end,
2564 .decode = mpeg_decode_frame,
2565 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2566 .flush = flush,
2567 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2568 };
2569 #endif
2570
2571 #if CONFIG_MPEG1_VDPAU_DECODER
2572 AVCodec ff_mpeg1_vdpau_decoder = {
2573 .name = "mpeg1video_vdpau",
2574 .type = AVMEDIA_TYPE_VIDEO,
2575 .id = CODEC_ID_MPEG1VIDEO,
2576 .priv_data_size = sizeof(Mpeg1Context),
2577 .init = mpeg_decode_init,
2578 .close = mpeg_decode_end,
2579 .decode = mpeg_decode_frame,
2580 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2581 .flush = flush,
2582 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2583 };
2584 #endif