avcodec: Deprecate dtg_active_format field in favor of avframe side-data
[ffmpeg.git] / libavcodec / mpeg12dec.c
1 /*
2  * MPEG-1/2 decoder
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of Libav.
7  *
8  * Libav is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * Libav is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22
23 /**
24  * @file
25  * MPEG-1/2 decoder
26  */
27
28 #include <inttypes.h>
29
30 #include "libavutil/attributes.h"
31 #include "libavutil/internal.h"
32 #include "libavutil/stereo3d.h"
33
34 #include "avcodec.h"
35 #include "bytestream.h"
36 #include "error_resilience.h"
37 #include "idctdsp.h"
38 #include "internal.h"
39 #include "mpeg_er.h"
40 #include "mpeg12.h"
41 #include "mpeg12data.h"
42 #include "mpegutils.h"
43 #include "mpegvideo.h"
44 #include "thread.h"
45 #include "version.h"
46 #include "xvmc_internal.h"
47
48 typedef struct Mpeg1Context {
49     MpegEncContext mpeg_enc_ctx;
50     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
51     int repeat_field;           /* true if we must repeat the field */
52     AVPanScan pan_scan;         /* some temporary storage for the panscan */
53     AVStereo3D stereo3d;
54     int has_stereo3d;
55     uint8_t *a53_caption;
56     int a53_caption_size;
57     uint8_t afd;
58     int has_afd;
59     int slice_count;
60     int save_aspect_info;
61     int save_width, save_height, save_progressive_seq;
62     AVRational frame_rate_ext;  /* MPEG-2 specific framerate modificator */
63     int sync;                   /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
64     int closed_gop;             /* GOP is closed */
65     int first_slice;
66     int extradata_decoded;
67 } Mpeg1Context;
68
69 #define MB_TYPE_ZERO_MV   0x20000000
70
71 static const uint32_t ptype2mb_type[7] = {
72                     MB_TYPE_INTRA,
73                     MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
74                     MB_TYPE_L0,
75                     MB_TYPE_L0 | MB_TYPE_CBP,
76     MB_TYPE_QUANT | MB_TYPE_INTRA,
77     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
78     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
79 };
80
81 static const uint32_t btype2mb_type[11] = {
82                     MB_TYPE_INTRA,
83                     MB_TYPE_L1,
84                     MB_TYPE_L1   | MB_TYPE_CBP,
85                     MB_TYPE_L0,
86                     MB_TYPE_L0   | MB_TYPE_CBP,
87                     MB_TYPE_L0L1,
88                     MB_TYPE_L0L1 | MB_TYPE_CBP,
89     MB_TYPE_QUANT | MB_TYPE_INTRA,
90     MB_TYPE_QUANT | MB_TYPE_L1   | MB_TYPE_CBP,
91     MB_TYPE_QUANT | MB_TYPE_L0   | MB_TYPE_CBP,
92     MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
93 };
94
95 static const uint8_t non_linear_qscale[32] = {
96      0,  1,  2,  3,  4,  5,   6,   7,
97      8, 10, 12, 14, 16, 18,  20,  22,
98     24, 28, 32, 36, 40, 44,  48,  52,
99     56, 64, 72, 80, 88, 96, 104, 112,
100 };
101
102 /* as H.263, but only 17 codes */
103 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
104 {
105     int code, sign, val, shift;
106
107     code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
108     if (code == 0)
109         return pred;
110     if (code < 0)
111         return 0xffff;
112
113     sign  = get_bits1(&s->gb);
114     shift = fcode - 1;
115     val   = code;
116     if (shift) {
117         val  = (val - 1) << shift;
118         val |= get_bits(&s->gb, shift);
119         val++;
120     }
121     if (sign)
122         val = -val;
123     val += pred;
124
125     /* modulo decoding */
126     return sign_extend(val, 5 + shift);
127 }
128
129 #define check_scantable_index(ctx, x)                                         \
130     do {                                                                      \
131         if ((x) > 63) {                                                       \
132             av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",     \
133                    ctx->mb_x, ctx->mb_y);                                     \
134             return AVERROR_INVALIDDATA;                                       \
135         }                                                                     \
136     } while (0)
137
138 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
139                                            int16_t *block, int n)
140 {
141     int level, dc, diff, i, j, run;
142     int component;
143     RLTable *rl                  = &ff_rl_mpeg1;
144     uint8_t *const scantable     = s->intra_scantable.permutated;
145     const uint16_t *quant_matrix = s->intra_matrix;
146     const int qscale             = s->qscale;
147
148     /* DC coefficient */
149     component = (n <= 3 ? 0 : n - 4 + 1);
150     diff = decode_dc(&s->gb, component);
151     if (diff >= 0xffff)
152         return -1;
153     dc  = s->last_dc[component];
154     dc += diff;
155     s->last_dc[component] = dc;
156     block[0] = dc * quant_matrix[0];
157     av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
158     i = 0;
159     {
160         OPEN_READER(re, &s->gb);
161         /* now quantify & encode AC coefficients */
162         for (;;) {
163             UPDATE_CACHE(re, &s->gb);
164             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
165                        TEX_VLC_BITS, 2, 0);
166
167             if (level == 127) {
168                 break;
169             } else if (level != 0) {
170                 i += run;
171                 check_scantable_index(s, i);
172                 j = scantable[i];
173                 level = (level * qscale * quant_matrix[j]) >> 4;
174                 level = (level - 1) | 1;
175                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
176                         SHOW_SBITS(re, &s->gb, 1);
177                 LAST_SKIP_BITS(re, &s->gb, 1);
178             } else {
179                 /* escape */
180                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
181                 LAST_SKIP_BITS(re, &s->gb, 6);
182                 UPDATE_CACHE(re, &s->gb);
183                 level = SHOW_SBITS(re, &s->gb, 8);
184                 SKIP_BITS(re, &s->gb, 8);
185                 if (level == -128) {
186                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
187                     LAST_SKIP_BITS(re, &s->gb, 8);
188                 } else if (level == 0) {
189                     level = SHOW_UBITS(re, &s->gb, 8);
190                     LAST_SKIP_BITS(re, &s->gb, 8);
191                 }
192                 i += run;
193                 check_scantable_index(s, i);
194                 j = scantable[i];
195                 if (level < 0) {
196                     level = -level;
197                     level = (level * qscale * quant_matrix[j]) >> 4;
198                     level = (level - 1) | 1;
199                     level = -level;
200                 } else {
201                     level = (level * qscale * quant_matrix[j]) >> 4;
202                     level = (level - 1) | 1;
203                 }
204             }
205
206             block[j] = level;
207         }
208         CLOSE_READER(re, &s->gb);
209     }
210     s->block_last_index[n] = i;
211     return 0;
212 }
213
214 int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
215 {
216     return mpeg1_decode_block_intra(s, block, n);
217 }
218
219 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
220                                            int16_t *block, int n)
221 {
222     int level, i, j, run;
223     RLTable *rl                  = &ff_rl_mpeg1;
224     uint8_t *const scantable     = s->intra_scantable.permutated;
225     const uint16_t *quant_matrix = s->inter_matrix;
226     const int qscale             = s->qscale;
227
228     {
229         OPEN_READER(re, &s->gb);
230         i = -1;
231         // special case for first coefficient, no need to add second VLC table
232         UPDATE_CACHE(re, &s->gb);
233         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
234             level = (3 * qscale * quant_matrix[0]) >> 5;
235             level = (level - 1) | 1;
236             if (GET_CACHE(re, &s->gb) & 0x40000000)
237                 level = -level;
238             block[0] = level;
239             i++;
240             SKIP_BITS(re, &s->gb, 2);
241             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
242                 goto end;
243         }
244         /* now quantify & encode AC coefficients */
245         for (;;) {
246             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
247                        TEX_VLC_BITS, 2, 0);
248
249             if (level != 0) {
250                 i += run;
251                 check_scantable_index(s, i);
252                 j = scantable[i];
253                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
254                 level = (level - 1) | 1;
255                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
256                         SHOW_SBITS(re, &s->gb, 1);
257                 SKIP_BITS(re, &s->gb, 1);
258             } else {
259                 /* escape */
260                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
261                 LAST_SKIP_BITS(re, &s->gb, 6);
262                 UPDATE_CACHE(re, &s->gb);
263                 level = SHOW_SBITS(re, &s->gb, 8);
264                 SKIP_BITS(re, &s->gb, 8);
265                 if (level == -128) {
266                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
267                     SKIP_BITS(re, &s->gb, 8);
268                 } else if (level == 0) {
269                     level = SHOW_UBITS(re, &s->gb, 8);
270                     SKIP_BITS(re, &s->gb, 8);
271                 }
272                 i += run;
273                 check_scantable_index(s, i);
274                 j = scantable[i];
275                 if (level < 0) {
276                     level = -level;
277                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
278                     level = (level - 1) | 1;
279                     level = -level;
280                 } else {
281                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
282                     level = (level - 1) | 1;
283                 }
284             }
285
286             block[j] = level;
287             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
288                 break;
289             UPDATE_CACHE(re, &s->gb);
290         }
291 end:
292         LAST_SKIP_BITS(re, &s->gb, 2);
293         CLOSE_READER(re, &s->gb);
294     }
295     s->block_last_index[n] = i;
296     return 0;
297 }
298
299 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
300                                                 int16_t *block, int n)
301 {
302     int level, i, j, run;
303     RLTable *rl              = &ff_rl_mpeg1;
304     uint8_t *const scantable = s->intra_scantable.permutated;
305     const int qscale         = s->qscale;
306
307     {
308         OPEN_READER(re, &s->gb);
309         i = -1;
310         // Special case for first coefficient, no need to add second VLC table.
311         UPDATE_CACHE(re, &s->gb);
312         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
313             level = (3 * qscale) >> 1;
314             level = (level - 1) | 1;
315             if (GET_CACHE(re, &s->gb) & 0x40000000)
316                 level = -level;
317             block[0] = level;
318             i++;
319             SKIP_BITS(re, &s->gb, 2);
320             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
321                 goto end;
322         }
323
324         /* now quantify & encode AC coefficients */
325         for (;;) {
326             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
327                        TEX_VLC_BITS, 2, 0);
328
329             if (level != 0) {
330                 i += run;
331                 check_scantable_index(s, i);
332                 j = scantable[i];
333                 level = ((level * 2 + 1) * qscale) >> 1;
334                 level = (level - 1) | 1;
335                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
336                         SHOW_SBITS(re, &s->gb, 1);
337                 SKIP_BITS(re, &s->gb, 1);
338             } else {
339                 /* escape */
340                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
341                 LAST_SKIP_BITS(re, &s->gb, 6);
342                 UPDATE_CACHE(re, &s->gb);
343                 level = SHOW_SBITS(re, &s->gb, 8);
344                 SKIP_BITS(re, &s->gb, 8);
345                 if (level == -128) {
346                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
347                     SKIP_BITS(re, &s->gb, 8);
348                 } else if (level == 0) {
349                     level = SHOW_UBITS(re, &s->gb, 8);
350                     SKIP_BITS(re, &s->gb, 8);
351                 }
352                 i += run;
353                 check_scantable_index(s, i);
354                 j = scantable[i];
355                 if (level < 0) {
356                     level = -level;
357                     level = ((level * 2 + 1) * qscale) >> 1;
358                     level = (level - 1) | 1;
359                     level = -level;
360                 } else {
361                     level = ((level * 2 + 1) * qscale) >> 1;
362                     level = (level - 1) | 1;
363                 }
364             }
365
366             block[j] = level;
367             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
368                 break;
369             UPDATE_CACHE(re, &s->gb);
370         }
371 end:
372         LAST_SKIP_BITS(re, &s->gb, 2);
373         CLOSE_READER(re, &s->gb);
374     }
375     s->block_last_index[n] = i;
376     return 0;
377 }
378
379 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
380                                                int16_t *block, int n)
381 {
382     int level, i, j, run;
383     RLTable *rl = &ff_rl_mpeg1;
384     uint8_t *const scantable = s->intra_scantable.permutated;
385     const uint16_t *quant_matrix;
386     const int qscale = s->qscale;
387     int mismatch;
388
389     mismatch = 1;
390
391     {
392         OPEN_READER(re, &s->gb);
393         i = -1;
394         if (n < 4)
395             quant_matrix = s->inter_matrix;
396         else
397             quant_matrix = s->chroma_inter_matrix;
398
399         // Special case for first coefficient, no need to add second VLC table.
400         UPDATE_CACHE(re, &s->gb);
401         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
402             level = (3 * qscale * quant_matrix[0]) >> 5;
403             if (GET_CACHE(re, &s->gb) & 0x40000000)
404                 level = -level;
405             block[0]  = level;
406             mismatch ^= level;
407             i++;
408             SKIP_BITS(re, &s->gb, 2);
409             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
410                 goto end;
411         }
412
413         /* now quantify & encode AC coefficients */
414         for (;;) {
415             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
416                        TEX_VLC_BITS, 2, 0);
417
418             if (level != 0) {
419                 i += run;
420                 check_scantable_index(s, i);
421                 j = scantable[i];
422                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
423                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
424                         SHOW_SBITS(re, &s->gb, 1);
425                 SKIP_BITS(re, &s->gb, 1);
426             } else {
427                 /* escape */
428                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
429                 LAST_SKIP_BITS(re, &s->gb, 6);
430                 UPDATE_CACHE(re, &s->gb);
431                 level = SHOW_SBITS(re, &s->gb, 12);
432                 SKIP_BITS(re, &s->gb, 12);
433
434                 i += run;
435                 check_scantable_index(s, i);
436                 j = scantable[i];
437                 if (level < 0) {
438                     level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
439                     level = -level;
440                 } else {
441                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
442                 }
443             }
444
445             mismatch ^= level;
446             block[j]  = level;
447             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
448                 break;
449             UPDATE_CACHE(re, &s->gb);
450         }
451 end:
452         LAST_SKIP_BITS(re, &s->gb, 2);
453         CLOSE_READER(re, &s->gb);
454     }
455     block[63] ^= (mismatch & 1);
456
457     s->block_last_index[n] = i;
458     return 0;
459 }
460
461 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
462                                                     int16_t *block, int n)
463 {
464     int level, i, j, run;
465     RLTable *rl              = &ff_rl_mpeg1;
466     uint8_t *const scantable = s->intra_scantable.permutated;
467     const int qscale         = s->qscale;
468     OPEN_READER(re, &s->gb);
469     i = -1;
470
471     // special case for first coefficient, no need to add second VLC table
472     UPDATE_CACHE(re, &s->gb);
473     if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
474         level = (3 * qscale) >> 1;
475         if (GET_CACHE(re, &s->gb) & 0x40000000)
476             level = -level;
477         block[0] = level;
478         i++;
479         SKIP_BITS(re, &s->gb, 2);
480         if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
481             goto end;
482     }
483
484     /* now quantify & encode AC coefficients */
485     for (;;) {
486         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
487
488         if (level != 0) {
489             i += run;
490             check_scantable_index(s, i);
491             j = scantable[i];
492             level = ((level * 2 + 1) * qscale) >> 1;
493             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
494                     SHOW_SBITS(re, &s->gb, 1);
495             SKIP_BITS(re, &s->gb, 1);
496         } else {
497             /* escape */
498             run = SHOW_UBITS(re, &s->gb, 6) + 1;
499             LAST_SKIP_BITS(re, &s->gb, 6);
500             UPDATE_CACHE(re, &s->gb);
501             level = SHOW_SBITS(re, &s->gb, 12);
502             SKIP_BITS(re, &s->gb, 12);
503
504             i += run;
505             check_scantable_index(s, i);
506             j = scantable[i];
507             if (level < 0) {
508                 level = ((-level * 2 + 1) * qscale) >> 1;
509                 level = -level;
510             } else {
511                 level = ((level * 2 + 1) * qscale) >> 1;
512             }
513         }
514
515         block[j] = level;
516         if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
517             break;
518         UPDATE_CACHE(re, &s->gb);
519     }
520 end:
521     LAST_SKIP_BITS(re, &s->gb, 2);
522     CLOSE_READER(re, &s->gb);
523     s->block_last_index[n] = i;
524     return 0;
525 }
526
527 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
528                                            int16_t *block, int n)
529 {
530     int level, dc, diff, i, j, run;
531     int component;
532     RLTable *rl;
533     uint8_t *const scantable = s->intra_scantable.permutated;
534     const uint16_t *quant_matrix;
535     const int qscale = s->qscale;
536     int mismatch;
537
538     /* DC coefficient */
539     if (n < 4) {
540         quant_matrix = s->intra_matrix;
541         component    = 0;
542     } else {
543         quant_matrix = s->chroma_intra_matrix;
544         component    = (n & 1) + 1;
545     }
546     diff = decode_dc(&s->gb, component);
547     if (diff >= 0xffff)
548         return -1;
549     dc  = s->last_dc[component];
550     dc += diff;
551     s->last_dc[component] = dc;
552     block[0] = dc << (3 - s->intra_dc_precision);
553     av_dlog(s->avctx, "dc=%d\n", block[0]);
554     mismatch = block[0] ^ 1;
555     i = 0;
556     if (s->intra_vlc_format)
557         rl = &ff_rl_mpeg2;
558     else
559         rl = &ff_rl_mpeg1;
560
561     {
562         OPEN_READER(re, &s->gb);
563         /* now quantify & encode AC coefficients */
564         for (;;) {
565             UPDATE_CACHE(re, &s->gb);
566             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
567                        TEX_VLC_BITS, 2, 0);
568
569             if (level == 127) {
570                 break;
571             } else if (level != 0) {
572                 i += run;
573                 check_scantable_index(s, i);
574                 j = scantable[i];
575                 level = (level * qscale * quant_matrix[j]) >> 4;
576                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
577                         SHOW_SBITS(re, &s->gb, 1);
578                 LAST_SKIP_BITS(re, &s->gb, 1);
579             } else {
580                 /* escape */
581                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
582                 LAST_SKIP_BITS(re, &s->gb, 6);
583                 UPDATE_CACHE(re, &s->gb);
584                 level = SHOW_SBITS(re, &s->gb, 12);
585                 SKIP_BITS(re, &s->gb, 12);
586                 i += run;
587                 check_scantable_index(s, i);
588                 j = scantable[i];
589                 if (level < 0) {
590                     level = (-level * qscale * quant_matrix[j]) >> 4;
591                     level = -level;
592                 } else {
593                     level = (level * qscale * quant_matrix[j]) >> 4;
594                 }
595             }
596
597             mismatch ^= level;
598             block[j]  = level;
599         }
600         CLOSE_READER(re, &s->gb);
601     }
602     block[63] ^= mismatch & 1;
603
604     s->block_last_index[n] = i;
605     return 0;
606 }
607
608 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
609                                                 int16_t *block, int n)
610 {
611     int level, dc, diff, i, j, run;
612     int component;
613     RLTable *rl;
614     uint8_t *const scantable = s->intra_scantable.permutated;
615     const uint16_t *quant_matrix;
616     const int qscale = s->qscale;
617
618     /* DC coefficient */
619     if (n < 4) {
620         quant_matrix = s->intra_matrix;
621         component    = 0;
622     } else {
623         quant_matrix = s->chroma_intra_matrix;
624         component    = (n & 1) + 1;
625     }
626     diff = decode_dc(&s->gb, component);
627     if (diff >= 0xffff)
628         return -1;
629     dc = s->last_dc[component];
630     dc += diff;
631     s->last_dc[component] = dc;
632     block[0] = dc << (3 - s->intra_dc_precision);
633     i = 0;
634     if (s->intra_vlc_format)
635         rl = &ff_rl_mpeg2;
636     else
637         rl = &ff_rl_mpeg1;
638
639     {
640         OPEN_READER(re, &s->gb);
641         /* now quantify & encode AC coefficients */
642         for (;;) {
643             UPDATE_CACHE(re, &s->gb);
644             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
645                        TEX_VLC_BITS, 2, 0);
646
647             if (level == 127) {
648                 break;
649             } else if (level != 0) {
650                 i += run;
651                 check_scantable_index(s, i);
652                 j = scantable[i];
653                 level = (level * qscale * quant_matrix[j]) >> 4;
654                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
655                         SHOW_SBITS(re, &s->gb, 1);
656                 LAST_SKIP_BITS(re, &s->gb, 1);
657             } else {
658                 /* escape */
659                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
660                 LAST_SKIP_BITS(re, &s->gb, 6);
661                 UPDATE_CACHE(re, &s->gb);
662                 level = SHOW_SBITS(re, &s->gb, 12);
663                 SKIP_BITS(re, &s->gb, 12);
664                 i += run;
665                 check_scantable_index(s, i);
666                 j = scantable[i];
667                 if (level < 0) {
668                     level = (-level * qscale * quant_matrix[j]) >> 4;
669                     level = -level;
670                 } else {
671                     level = (level * qscale * quant_matrix[j]) >> 4;
672                 }
673             }
674
675             block[j] = level;
676         }
677         CLOSE_READER(re, &s->gb);
678     }
679
680     s->block_last_index[n] = i;
681     return 0;
682 }
683
684 /******************************************/
685 /* decoding */
686
687 static inline int get_dmv(MpegEncContext *s)
688 {
689     if (get_bits1(&s->gb))
690         return 1 - (get_bits1(&s->gb) << 1);
691     else
692         return 0;
693 }
694
695 static inline int get_qscale(MpegEncContext *s)
696 {
697     int qscale = get_bits(&s->gb, 5);
698     if (s->q_scale_type)
699         return non_linear_qscale[qscale];
700     else
701         return qscale << 1;
702 }
703
704 /* motion type (for MPEG-2) */
705 #define MT_FIELD 1
706 #define MT_FRAME 2
707 #define MT_16X8  2
708 #define MT_DMV   3
709
710 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
711 {
712     int i, j, k, cbp, val, mb_type, motion_type;
713     const int mb_block_count = 4 + (1 << s->chroma_format);
714
715     av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
716
717     assert(s->mb_skipped == 0);
718
719     if (s->mb_skip_run-- != 0) {
720         if (s->pict_type == AV_PICTURE_TYPE_P) {
721             s->mb_skipped = 1;
722             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
723                 MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
724         } else {
725             int mb_type;
726
727             if (s->mb_x)
728                 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
729             else
730                 // FIXME not sure if this is allowed in MPEG at all
731                 mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
732             if (IS_INTRA(mb_type))
733                 return -1;
734             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
735                 mb_type | MB_TYPE_SKIP;
736 //            assert(s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1] & (MB_TYPE_16x16 | MB_TYPE_16x8));
737
738             if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
739                 s->mb_skipped = 1;
740         }
741
742         return 0;
743     }
744
745     switch (s->pict_type) {
746     default:
747     case AV_PICTURE_TYPE_I:
748         if (get_bits1(&s->gb) == 0) {
749             if (get_bits1(&s->gb) == 0) {
750                 av_log(s->avctx, AV_LOG_ERROR,
751                        "invalid mb type in I Frame at %d %d\n",
752                        s->mb_x, s->mb_y);
753                 return -1;
754             }
755             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
756         } else {
757             mb_type = MB_TYPE_INTRA;
758         }
759         break;
760     case AV_PICTURE_TYPE_P:
761         mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
762         if (mb_type < 0) {
763             av_log(s->avctx, AV_LOG_ERROR,
764                    "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
765             return -1;
766         }
767         mb_type = ptype2mb_type[mb_type];
768         break;
769     case AV_PICTURE_TYPE_B:
770         mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
771         if (mb_type < 0) {
772             av_log(s->avctx, AV_LOG_ERROR,
773                    "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
774             return -1;
775         }
776         mb_type = btype2mb_type[mb_type];
777         break;
778     }
779     av_dlog(s->avctx, "mb_type=%x\n", mb_type);
780 //    motion_type = 0; /* avoid warning */
781     if (IS_INTRA(mb_type)) {
782         s->bdsp.clear_blocks(s->block[0]);
783
784         if (!s->chroma_y_shift)
785             s->bdsp.clear_blocks(s->block[6]);
786
787         /* compute DCT type */
788         // FIXME: add an interlaced_dct coded var?
789         if (s->picture_structure == PICT_FRAME &&
790             !s->frame_pred_frame_dct)
791             s->interlaced_dct = get_bits1(&s->gb);
792
793         if (IS_QUANT(mb_type))
794             s->qscale = get_qscale(s);
795
796         if (s->concealment_motion_vectors) {
797             /* just parse them */
798             if (s->picture_structure != PICT_FRAME)
799                 skip_bits1(&s->gb);  /* field select */
800
801             s->mv[0][0][0]      =
802             s->last_mv[0][0][0] =
803             s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
804                                                      s->last_mv[0][0][0]);
805             s->mv[0][0][1]      =
806             s->last_mv[0][0][1] =
807             s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
808                                                      s->last_mv[0][0][1]);
809
810             skip_bits1(&s->gb); /* marker */
811         } else {
812             /* reset mv prediction */
813             memset(s->last_mv, 0, sizeof(s->last_mv));
814         }
815         s->mb_intra = 1;
816 #if FF_API_XVMC
817 FF_DISABLE_DEPRECATION_WARNINGS
818         // if 1, we memcpy blocks in xvmcvideo
819         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
820             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
821 FF_ENABLE_DEPRECATION_WARNINGS
822 #endif /* FF_API_XVMC */
823
824         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
825             if (s->flags2 & CODEC_FLAG2_FAST) {
826                 for (i = 0; i < 6; i++)
827                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
828             } else {
829                 for (i = 0; i < mb_block_count; i++)
830                     if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
831                         return -1;
832             }
833         } else {
834             for (i = 0; i < 6; i++)
835                 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
836                     return -1;
837         }
838     } else {
839         if (mb_type & MB_TYPE_ZERO_MV) {
840             assert(mb_type & MB_TYPE_CBP);
841
842             s->mv_dir = MV_DIR_FORWARD;
843             if (s->picture_structure == PICT_FRAME) {
844                 if (!s->frame_pred_frame_dct)
845                     s->interlaced_dct = get_bits1(&s->gb);
846                 s->mv_type = MV_TYPE_16X16;
847             } else {
848                 s->mv_type            = MV_TYPE_FIELD;
849                 mb_type              |= MB_TYPE_INTERLACED;
850                 s->field_select[0][0] = s->picture_structure - 1;
851             }
852
853             if (IS_QUANT(mb_type))
854                 s->qscale = get_qscale(s);
855
856             s->last_mv[0][0][0] = 0;
857             s->last_mv[0][0][1] = 0;
858             s->last_mv[0][1][0] = 0;
859             s->last_mv[0][1][1] = 0;
860             s->mv[0][0][0]      = 0;
861             s->mv[0][0][1]      = 0;
862         } else {
863             assert(mb_type & MB_TYPE_L0L1);
864             // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
865             /* get additional motion vector type */
866             if (s->frame_pred_frame_dct) {
867                 motion_type = MT_FRAME;
868             } else {
869                 motion_type = get_bits(&s->gb, 2);
870                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
871                     s->interlaced_dct = get_bits1(&s->gb);
872             }
873
874             if (IS_QUANT(mb_type))
875                 s->qscale = get_qscale(s);
876
877             /* motion vectors */
878             s->mv_dir = (mb_type >> 13) & 3;
879             av_dlog(s->avctx, "motion_type=%d\n", motion_type);
880             switch (motion_type) {
881             case MT_FRAME: /* or MT_16X8 */
882                 if (s->picture_structure == PICT_FRAME) {
883                     mb_type   |= MB_TYPE_16x16;
884                     s->mv_type = MV_TYPE_16X16;
885                     for (i = 0; i < 2; i++) {
886                         if (USES_LIST(mb_type, i)) {
887                             /* MT_FRAME */
888                             s->mv[i][0][0]      =
889                             s->last_mv[i][0][0] =
890                             s->last_mv[i][1][0] =
891                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0],
892                                                    s->last_mv[i][0][0]);
893                             s->mv[i][0][1]      =
894                             s->last_mv[i][0][1] =
895                             s->last_mv[i][1][1] =
896                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1],
897                                                    s->last_mv[i][0][1]);
898                             /* full_pel: only for MPEG-1 */
899                             if (s->full_pel[i]) {
900                                 s->mv[i][0][0] <<= 1;
901                                 s->mv[i][0][1] <<= 1;
902                             }
903                         }
904                     }
905                 } else {
906                     mb_type   |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
907                     s->mv_type = MV_TYPE_16X8;
908                     for (i = 0; i < 2; i++) {
909                         if (USES_LIST(mb_type, i)) {
910                             /* MT_16X8 */
911                             for (j = 0; j < 2; j++) {
912                                 s->field_select[i][j] = get_bits1(&s->gb);
913                                 for (k = 0; k < 2; k++) {
914                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
915                                                              s->last_mv[i][j][k]);
916                                     s->last_mv[i][j][k] = val;
917                                     s->mv[i][j][k]      = val;
918                                 }
919                             }
920                         }
921                     }
922                 }
923                 break;
924             case MT_FIELD:
925                 s->mv_type = MV_TYPE_FIELD;
926                 if (s->picture_structure == PICT_FRAME) {
927                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
928                     for (i = 0; i < 2; i++) {
929                         if (USES_LIST(mb_type, i)) {
930                             for (j = 0; j < 2; j++) {
931                                 s->field_select[i][j] = get_bits1(&s->gb);
932                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
933                                                          s->last_mv[i][j][0]);
934                                 s->last_mv[i][j][0] = val;
935                                 s->mv[i][j][0]      = val;
936                                 av_dlog(s->avctx, "fmx=%d\n", val);
937                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
938                                                          s->last_mv[i][j][1] >> 1);
939                                 s->last_mv[i][j][1] = val << 1;
940                                 s->mv[i][j][1]      = val;
941                                 av_dlog(s->avctx, "fmy=%d\n", val);
942                             }
943                         }
944                     }
945                 } else {
946                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
947                     for (i = 0; i < 2; i++) {
948                         if (USES_LIST(mb_type, i)) {
949                             s->field_select[i][0] = get_bits1(&s->gb);
950                             for (k = 0; k < 2; k++) {
951                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
952                                                          s->last_mv[i][0][k]);
953                                 s->last_mv[i][0][k] = val;
954                                 s->last_mv[i][1][k] = val;
955                                 s->mv[i][0][k]      = val;
956                             }
957                         }
958                     }
959                 }
960                 break;
961             case MT_DMV:
962                 s->mv_type = MV_TYPE_DMV;
963                 for (i = 0; i < 2; i++) {
964                     if (USES_LIST(mb_type, i)) {
965                         int dmx, dmy, mx, my, m;
966                         const int my_shift = s->picture_structure == PICT_FRAME;
967
968                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
969                                                 s->last_mv[i][0][0]);
970                         s->last_mv[i][0][0] = mx;
971                         s->last_mv[i][1][0] = mx;
972                         dmx = get_dmv(s);
973                         my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
974                                                  s->last_mv[i][0][1] >> my_shift);
975                         dmy = get_dmv(s);
976
977
978                         s->last_mv[i][0][1] = my << my_shift;
979                         s->last_mv[i][1][1] = my << my_shift;
980
981                         s->mv[i][0][0] = mx;
982                         s->mv[i][0][1] = my;
983                         s->mv[i][1][0] = mx; // not used
984                         s->mv[i][1][1] = my; // not used
985
986                         if (s->picture_structure == PICT_FRAME) {
987                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
988
989                             // m = 1 + 2 * s->top_field_first;
990                             m = s->top_field_first ? 1 : 3;
991
992                             /* top -> top pred */
993                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
994                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
995                             m = 4 - m;
996                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
997                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
998                         } else {
999                             mb_type |= MB_TYPE_16x16;
1000
1001                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1002                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1003                             if (s->picture_structure == PICT_TOP_FIELD)
1004                                 s->mv[i][2][1]--;
1005                             else
1006                                 s->mv[i][2][1]++;
1007                         }
1008                     }
1009                 }
1010                 break;
1011             default:
1012                 av_log(s->avctx, AV_LOG_ERROR,
1013                        "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1014                 return -1;
1015             }
1016         }
1017
1018         s->mb_intra = 0;
1019         if (HAS_CBP(mb_type)) {
1020             s->bdsp.clear_blocks(s->block[0]);
1021
1022             cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1023             if (mb_block_count > 6) {
1024                 cbp <<= mb_block_count - 6;
1025                 cbp  |= get_bits(&s->gb, mb_block_count - 6);
1026                 s->bdsp.clear_blocks(s->block[6]);
1027             }
1028             if (cbp <= 0) {
1029                 av_log(s->avctx, AV_LOG_ERROR,
1030                        "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1031                 return -1;
1032             }
1033
1034 #if FF_API_XVMC
1035 FF_DISABLE_DEPRECATION_WARNINGS
1036             // if 1, we memcpy blocks in xvmcvideo
1037             if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1038                 ff_xvmc_pack_pblocks(s, cbp);
1039 FF_ENABLE_DEPRECATION_WARNINGS
1040 #endif /* FF_API_XVMC */
1041
1042             if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1043                 if (s->flags2 & CODEC_FLAG2_FAST) {
1044                     for (i = 0; i < 6; i++) {
1045                         if (cbp & 32)
1046                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1047                         else
1048                             s->block_last_index[i] = -1;
1049                         cbp += cbp;
1050                     }
1051                 } else {
1052                     cbp <<= 12 - mb_block_count;
1053
1054                     for (i = 0; i < mb_block_count; i++) {
1055                         if (cbp & (1 << 11)) {
1056                             if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
1057                                 return -1;
1058                         } else {
1059                             s->block_last_index[i] = -1;
1060                         }
1061                         cbp += cbp;
1062                     }
1063                 }
1064             } else {
1065                 if (s->flags2 & CODEC_FLAG2_FAST) {
1066                     for (i = 0; i < 6; i++) {
1067                         if (cbp & 32)
1068                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1069                         else
1070                             s->block_last_index[i] = -1;
1071                         cbp += cbp;
1072                     }
1073                 } else {
1074                     for (i = 0; i < 6; i++) {
1075                         if (cbp & 32) {
1076                             if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
1077                                 return -1;
1078                         } else {
1079                             s->block_last_index[i] = -1;
1080                         }
1081                         cbp += cbp;
1082                     }
1083                 }
1084             }
1085         } else {
1086             for (i = 0; i < 12; i++)
1087                 s->block_last_index[i] = -1;
1088         }
1089     }
1090
1091     s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1092
1093     return 0;
1094 }
1095
1096 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1097 {
1098     Mpeg1Context *s    = avctx->priv_data;
1099     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1100     int i;
1101
1102     /* we need some permutation to store matrices,
1103      * until MPV_common_init() sets the real permutation. */
1104     for (i = 0; i < 64; i++)
1105         s2->idsp.idct_permutation[i] = i;
1106
1107     ff_MPV_decode_defaults(s2);
1108
1109     s->mpeg_enc_ctx.avctx  = avctx;
1110     s->mpeg_enc_ctx.flags  = avctx->flags;
1111     s->mpeg_enc_ctx.flags2 = avctx->flags2;
1112     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1113     ff_mpeg12_init_vlcs();
1114
1115     s->mpeg_enc_ctx_allocated      = 0;
1116     s->mpeg_enc_ctx.picture_number = 0;
1117     s->repeat_field                = 0;
1118     s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1119     avctx->color_range             = AVCOL_RANGE_MPEG;
1120     if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1121         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1122     else
1123         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1124     return 0;
1125 }
1126
1127 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1128                                              const AVCodecContext *avctx_from)
1129 {
1130     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1131     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1132     int err;
1133
1134     if (avctx == avctx_from               ||
1135         !ctx_from->mpeg_enc_ctx_allocated ||
1136         !s1->context_initialized)
1137         return 0;
1138
1139     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1140     if (err)
1141         return err;
1142
1143     if (!ctx->mpeg_enc_ctx_allocated)
1144         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1145
1146     if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1147         s->picture_number++;
1148
1149     return 0;
1150 }
1151
1152 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1153                                  const uint8_t *new_perm)
1154 {
1155     uint16_t temp_matrix[64];
1156     int i;
1157
1158     memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1159
1160     for (i = 0; i < 64; i++)
1161         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1162 }
1163
1164 #if FF_API_XVMC
1165 static const enum AVPixelFormat pixfmt_xvmc_mpg2_420[] = {
1166     AV_PIX_FMT_XVMC_MPEG2_IDCT,
1167     AV_PIX_FMT_XVMC_MPEG2_MC,
1168     AV_PIX_FMT_NONE
1169 };
1170 #endif /* FF_API_XVMC */
1171
1172 static const enum AVPixelFormat mpeg12_hwaccel_pixfmt_list_420[] = {
1173 #if CONFIG_MPEG2_DXVA2_HWACCEL
1174     AV_PIX_FMT_DXVA2_VLD,
1175 #endif
1176 #if CONFIG_MPEG2_VAAPI_HWACCEL
1177     AV_PIX_FMT_VAAPI_VLD,
1178 #endif
1179 #if CONFIG_MPEG1_VDPAU_HWACCEL | CONFIG_MPEG2_VDPAU_HWACCEL
1180     AV_PIX_FMT_VDPAU,
1181 #endif
1182     AV_PIX_FMT_YUV420P,
1183     AV_PIX_FMT_NONE
1184 };
1185
1186 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1187 {
1188     Mpeg1Context *s1  = avctx->priv_data;
1189     MpegEncContext *s = &s1->mpeg_enc_ctx;
1190
1191 #if FF_API_XVMC
1192 FF_DISABLE_DEPRECATION_WARNINGS
1193     if (avctx->xvmc_acceleration)
1194         return ff_get_format(avctx, pixfmt_xvmc_mpg2_420);
1195 FF_ENABLE_DEPRECATION_WARNINGS
1196 #endif /* FF_API_XVMC */
1197
1198     if (s->chroma_format < 2)
1199         return ff_get_format(avctx, mpeg12_hwaccel_pixfmt_list_420);
1200     else if (s->chroma_format == 2)
1201         return AV_PIX_FMT_YUV422P;
1202     else
1203         return AV_PIX_FMT_YUV444P;
1204 }
1205
1206 /* Call this function when we know all parameters.
1207  * It may be called in different places for MPEG-1 and MPEG-2. */
1208 static int mpeg_decode_postinit(AVCodecContext *avctx)
1209 {
1210     Mpeg1Context *s1  = avctx->priv_data;
1211     MpegEncContext *s = &s1->mpeg_enc_ctx;
1212     uint8_t old_permutation[64];
1213     int ret;
1214
1215     if ((s1->mpeg_enc_ctx_allocated == 0)                   ||
1216         avctx->coded_width       != s->width                ||
1217         avctx->coded_height      != s->height               ||
1218         s1->save_width           != s->width                ||
1219         s1->save_height          != s->height               ||
1220         s1->save_aspect_info     != s->aspect_ratio_info    ||
1221         s1->save_progressive_seq != s->progressive_sequence ||
1222         0) {
1223         if (s1->mpeg_enc_ctx_allocated) {
1224             ParseContext pc = s->parse_context;
1225             s->parse_context.buffer = 0;
1226             ff_MPV_common_end(s);
1227             s->parse_context = pc;
1228         }
1229
1230         if ((s->width == 0) || (s->height == 0))
1231             return -2;
1232
1233         ret = ff_set_dimensions(avctx, s->width, s->height);
1234         if (ret < 0)
1235             return ret;
1236
1237         avctx->bit_rate          = s->bit_rate;
1238         s1->save_aspect_info     = s->aspect_ratio_info;
1239         s1->save_width           = s->width;
1240         s1->save_height          = s->height;
1241         s1->save_progressive_seq = s->progressive_sequence;
1242
1243         /* low_delay may be forced, in this case we will have B-frames
1244          * that behave like P-frames. */
1245         avctx->has_b_frames = !s->low_delay;
1246
1247         if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1248             // MPEG-1 fps
1249             avctx->time_base.den = ff_mpeg12_frame_rate_tab[s->frame_rate_index].num;
1250             avctx->time_base.num = ff_mpeg12_frame_rate_tab[s->frame_rate_index].den;
1251             // MPEG-1 aspect
1252             avctx->sample_aspect_ratio = av_d2q(1.0 / ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1253             avctx->ticks_per_frame     = 1;
1254         } else { // MPEG-2
1255             // MPEG-2 fps
1256             av_reduce(&s->avctx->time_base.den,
1257                       &s->avctx->time_base.num,
1258                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num * 2,
1259                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1260                       1 << 30);
1261             avctx->ticks_per_frame = 2;
1262             // MPEG-2 aspect
1263             if (s->aspect_ratio_info > 1) {
1264                 AVRational dar =
1265                     av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1266                                       (AVRational) { s1->pan_scan.width,
1267                                                      s1->pan_scan.height }),
1268                              (AVRational) { s->width, s->height });
1269
1270                 /* We ignore the spec here and guess a bit as reality does not
1271                  * match the spec, see for example res_change_ffmpeg_aspect.ts
1272                  * and sequence-display-aspect.mpg.
1273                  * issue1613, 621, 562 */
1274                 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1275                     (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1276                      av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1277                     s->avctx->sample_aspect_ratio =
1278                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1279                                  (AVRational) { s->width, s->height });
1280                 } else {
1281                     s->avctx->sample_aspect_ratio =
1282                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1283                                  (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1284 // issue1613 4/3 16/9 -> 16/9
1285 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1286 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1287 //                    s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1288                     av_dlog(avctx, "A %d/%d\n",
1289                             ff_mpeg2_aspect[s->aspect_ratio_info].num,
1290                             ff_mpeg2_aspect[s->aspect_ratio_info].den);
1291                     av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1292                             s->avctx->sample_aspect_ratio.den);
1293                 }
1294             } else {
1295                 s->avctx->sample_aspect_ratio =
1296                     ff_mpeg2_aspect[s->aspect_ratio_info];
1297             }
1298         } // MPEG-2
1299
1300         ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
1301
1302         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1303         // until then pix_fmt may be changed right after codec init
1304 #if FF_API_XVMC
1305         if ((avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT ||
1306              avctx->hwaccel) && avctx->idct_algo == FF_IDCT_AUTO)
1307 #else
1308         if (avctx->hwaccel && avctx->idct_algo == FF_IDCT_AUTO)
1309 #endif /* FF_API_XVMC */
1310             avctx->idct_algo = FF_IDCT_SIMPLE;
1311
1312         /* Quantization matrices may need reordering
1313          * if DCT permutation is changed. */
1314         memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1315
1316         if (ff_MPV_common_init(s) < 0)
1317             return -2;
1318
1319         quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->idsp.idct_permutation);
1320         quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->idsp.idct_permutation);
1321         quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1322         quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1323
1324         s1->mpeg_enc_ctx_allocated = 1;
1325     }
1326     return 0;
1327 }
1328
1329 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1330                                 int buf_size)
1331 {
1332     Mpeg1Context *s1  = avctx->priv_data;
1333     MpegEncContext *s = &s1->mpeg_enc_ctx;
1334     int ref, f_code, vbv_delay;
1335
1336     init_get_bits(&s->gb, buf, buf_size * 8);
1337
1338     ref = get_bits(&s->gb, 10); /* temporal ref */
1339     s->pict_type = get_bits(&s->gb, 3);
1340     if (s->pict_type == 0 || s->pict_type > 3)
1341         return -1;
1342
1343     vbv_delay = get_bits(&s->gb, 16);
1344     if (s->pict_type == AV_PICTURE_TYPE_P ||
1345         s->pict_type == AV_PICTURE_TYPE_B) {
1346         s->full_pel[0] = get_bits1(&s->gb);
1347         f_code = get_bits(&s->gb, 3);
1348         if (f_code == 0 && (avctx->err_recognition & AV_EF_BITSTREAM))
1349             return -1;
1350         s->mpeg_f_code[0][0] = f_code;
1351         s->mpeg_f_code[0][1] = f_code;
1352     }
1353     if (s->pict_type == AV_PICTURE_TYPE_B) {
1354         s->full_pel[1] = get_bits1(&s->gb);
1355         f_code = get_bits(&s->gb, 3);
1356         if (f_code == 0 && (avctx->err_recognition & AV_EF_BITSTREAM))
1357             return -1;
1358         s->mpeg_f_code[1][0] = f_code;
1359         s->mpeg_f_code[1][1] = f_code;
1360     }
1361     s->current_picture.f->pict_type = s->pict_type;
1362     s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1363
1364     if (avctx->debug & FF_DEBUG_PICT_INFO)
1365         av_log(avctx, AV_LOG_DEBUG,
1366                "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1367
1368     s->y_dc_scale = 8;
1369     s->c_dc_scale = 8;
1370     return 0;
1371 }
1372
1373 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1374 {
1375     MpegEncContext *s = &s1->mpeg_enc_ctx;
1376     int horiz_size_ext, vert_size_ext;
1377     int bit_rate_ext;
1378
1379     skip_bits(&s->gb, 1); /* profile and level esc*/
1380     s->avctx->profile       = get_bits(&s->gb, 3);
1381     s->avctx->level         = get_bits(&s->gb, 4);
1382     s->progressive_sequence = get_bits1(&s->gb);   /* progressive_sequence */
1383     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1384     horiz_size_ext          = get_bits(&s->gb, 2);
1385     vert_size_ext           = get_bits(&s->gb, 2);
1386     s->width  |= (horiz_size_ext << 12);
1387     s->height |= (vert_size_ext  << 12);
1388     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1389     s->bit_rate += (bit_rate_ext << 18) * 400;
1390     skip_bits1(&s->gb); /* marker */
1391     s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1392
1393     s->low_delay = get_bits1(&s->gb);
1394     if (s->flags & CODEC_FLAG_LOW_DELAY)
1395         s->low_delay = 1;
1396
1397     s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1398     s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1399
1400     av_dlog(s->avctx, "sequence extension\n");
1401     s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1402
1403     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1404         av_log(s->avctx, AV_LOG_DEBUG,
1405                "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1406                s->avctx->profile, s->avctx->level,
1407                s->avctx->rc_buffer_size, s->bit_rate);
1408 }
1409
1410 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1411 {
1412     MpegEncContext *s = &s1->mpeg_enc_ctx;
1413     int color_description, w, h;
1414
1415     skip_bits(&s->gb, 3); /* video format */
1416     color_description = get_bits1(&s->gb);
1417     if (color_description) {
1418         s->avctx->color_primaries = get_bits(&s->gb, 8);
1419         s->avctx->color_trc       = get_bits(&s->gb, 8);
1420         s->avctx->colorspace      = get_bits(&s->gb, 8);
1421     }
1422     w = get_bits(&s->gb, 14);
1423     skip_bits(&s->gb, 1); // marker
1424     h = get_bits(&s->gb, 14);
1425     // remaining 3 bits are zero padding
1426
1427     s1->pan_scan.width  = 16 * w;
1428     s1->pan_scan.height = 16 * h;
1429
1430     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1431         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1432 }
1433
1434 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1435 {
1436     MpegEncContext *s = &s1->mpeg_enc_ctx;
1437     int i, nofco;
1438
1439     nofco = 1;
1440     if (s->progressive_sequence) {
1441         if (s->repeat_first_field) {
1442             nofco++;
1443             if (s->top_field_first)
1444                 nofco++;
1445         }
1446     } else {
1447         if (s->picture_structure == PICT_FRAME) {
1448             nofco++;
1449             if (s->repeat_first_field)
1450                 nofco++;
1451         }
1452     }
1453     for (i = 0; i < nofco; i++) {
1454         s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1455         skip_bits(&s->gb, 1); // marker
1456         s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1457         skip_bits(&s->gb, 1); // marker
1458     }
1459
1460     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1461         av_log(s->avctx, AV_LOG_DEBUG,
1462                "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1463                s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1464                s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1465                s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1466 }
1467
1468 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1469                        uint16_t matrix1[64], int intra)
1470 {
1471     int i;
1472
1473     for (i = 0; i < 64; i++) {
1474         int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1475         int v = get_bits(&s->gb, 8);
1476         if (v == 0) {
1477             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1478             return -1;
1479         }
1480         if (intra && i == 0 && v != 8) {
1481             av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
1482             v = 8; // needed by pink.mpg / issue1046
1483         }
1484         matrix0[j] = v;
1485         if (matrix1)
1486             matrix1[j] = v;
1487     }
1488     return 0;
1489 }
1490
1491 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1492 {
1493     av_dlog(s->avctx, "matrix extension\n");
1494
1495     if (get_bits1(&s->gb))
1496         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1497     if (get_bits1(&s->gb))
1498         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1499     if (get_bits1(&s->gb))
1500         load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1501     if (get_bits1(&s->gb))
1502         load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1503 }
1504
1505 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1506 {
1507     MpegEncContext *s = &s1->mpeg_enc_ctx;
1508
1509     s->full_pel[0]       = s->full_pel[1] = 0;
1510     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1511     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1512     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1513     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1514     if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1515         av_log(s->avctx, AV_LOG_ERROR,
1516                "Missing picture start code, guessing missing values\n");
1517         if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1518             if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1519                 s->pict_type = AV_PICTURE_TYPE_I;
1520             else
1521                 s->pict_type = AV_PICTURE_TYPE_P;
1522         } else
1523             s->pict_type = AV_PICTURE_TYPE_B;
1524         s->current_picture.f->pict_type = s->pict_type;
1525         s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1526     }
1527     s->intra_dc_precision         = get_bits(&s->gb, 2);
1528     s->picture_structure          = get_bits(&s->gb, 2);
1529     s->top_field_first            = get_bits1(&s->gb);
1530     s->frame_pred_frame_dct       = get_bits1(&s->gb);
1531     s->concealment_motion_vectors = get_bits1(&s->gb);
1532     s->q_scale_type               = get_bits1(&s->gb);
1533     s->intra_vlc_format           = get_bits1(&s->gb);
1534     s->alternate_scan             = get_bits1(&s->gb);
1535     s->repeat_first_field         = get_bits1(&s->gb);
1536     s->chroma_420_type            = get_bits1(&s->gb);
1537     s->progressive_frame          = get_bits1(&s->gb);
1538
1539     if (s->progressive_sequence && !s->progressive_frame) {
1540         s->progressive_frame = 1;
1541         av_log(s->avctx, AV_LOG_ERROR,
1542                "interlaced frame in progressive sequence, ignoring\n");
1543     }
1544
1545     if (s->picture_structure == 0 ||
1546         (s->progressive_frame && s->picture_structure != PICT_FRAME)) {
1547         av_log(s->avctx, AV_LOG_ERROR,
1548                "picture_structure %d invalid, ignoring\n",
1549                s->picture_structure);
1550         s->picture_structure = PICT_FRAME;
1551     }
1552
1553     if (s->progressive_sequence && !s->frame_pred_frame_dct)
1554         av_log(s->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
1555
1556     if (s->picture_structure == PICT_FRAME) {
1557         s->first_field = 0;
1558         s->v_edge_pos  = 16 * s->mb_height;
1559     } else {
1560         s->first_field ^= 1;
1561         s->v_edge_pos   = 8 * s->mb_height;
1562         memset(s->mbskip_table, 0, s->mb_stride * s->mb_height);
1563     }
1564
1565     if (s->alternate_scan) {
1566         ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1567         ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1568     } else {
1569         ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1570         ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1571     }
1572
1573     /* composite display not parsed */
1574     av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1575     av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1576     av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1577     av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1578     av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1579     av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1580     av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1581     av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1582     av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1583 }
1584
1585 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1586 {
1587     AVCodecContext *avctx = s->avctx;
1588     Mpeg1Context *s1      = (Mpeg1Context *) s;
1589
1590     /* start frame decoding */
1591     if (s->first_field || s->picture_structure == PICT_FRAME) {
1592         AVFrameSideData *pan_scan;
1593
1594         if (ff_MPV_frame_start(s, avctx) < 0)
1595             return -1;
1596
1597         ff_mpeg_er_frame_start(s);
1598
1599         /* first check if we must repeat the frame */
1600         s->current_picture_ptr->f->repeat_pict = 0;
1601         if (s->repeat_first_field) {
1602             if (s->progressive_sequence) {
1603                 if (s->top_field_first)
1604                     s->current_picture_ptr->f->repeat_pict = 4;
1605                 else
1606                     s->current_picture_ptr->f->repeat_pict = 2;
1607             } else if (s->progressive_frame) {
1608                 s->current_picture_ptr->f->repeat_pict = 1;
1609             }
1610         }
1611
1612         pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1613                                           AV_FRAME_DATA_PANSCAN,
1614                                           sizeof(s1->pan_scan));
1615         if (!pan_scan)
1616             return AVERROR(ENOMEM);
1617         memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1618
1619         if (s1->a53_caption) {
1620             AVFrameSideData *sd = av_frame_new_side_data(
1621                 s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1622                 s1->a53_caption_size);
1623             if (sd)
1624                 memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1625             av_freep(&s1->a53_caption);
1626         }
1627
1628         if (s1->has_stereo3d) {
1629             AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1630             if (!stereo)
1631                 return AVERROR(ENOMEM);
1632
1633             *stereo = s1->stereo3d;
1634             s1->has_stereo3d = 0;
1635         }
1636
1637         if (s1->has_afd) {
1638             AVFrameSideData *sd =
1639                 av_frame_new_side_data(s->current_picture_ptr->f,
1640                                        AV_FRAME_DATA_AFD, 1);
1641             if (!sd)
1642                 return AVERROR(ENOMEM);
1643
1644             *sd->data   = s1->afd;
1645             s1->has_afd = 0;
1646         }
1647
1648         if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1649             ff_thread_finish_setup(avctx);
1650     } else { // second field
1651         int i;
1652
1653         if (!s->current_picture_ptr) {
1654             av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1655             return -1;
1656         }
1657
1658         if (s->avctx->hwaccel &&
1659             (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1660             if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1661                 av_log(avctx, AV_LOG_ERROR,
1662                        "hardware accelerator failed to decode first field\n");
1663         }
1664
1665         for (i = 0; i < 4; i++) {
1666             s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1667             if (s->picture_structure == PICT_BOTTOM_FIELD)
1668                 s->current_picture.f->data[i] +=
1669                     s->current_picture_ptr->f->linesize[i];
1670         }
1671     }
1672
1673     if (avctx->hwaccel) {
1674         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1675             return -1;
1676     }
1677
1678 #if FF_API_XVMC
1679 FF_DISABLE_DEPRECATION_WARNINGS
1680 // MPV_frame_start will call this function too,
1681 // but we need to call it on every field
1682     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1683         if (ff_xvmc_field_start(s, avctx) < 0)
1684             return -1;
1685 FF_ENABLE_DEPRECATION_WARNINGS
1686 #endif /* FF_API_XVMC */
1687
1688     return 0;
1689 }
1690
1691 #define DECODE_SLICE_ERROR -1
1692 #define DECODE_SLICE_OK     0
1693
1694 /**
1695  * Decode a slice.
1696  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1697  * @return DECODE_SLICE_ERROR if the slice is damaged,
1698  *         DECODE_SLICE_OK if this slice is OK
1699  */
1700 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1701                              const uint8_t **buf, int buf_size)
1702 {
1703     AVCodecContext *avctx = s->avctx;
1704     const int field_pic   = s->picture_structure != PICT_FRAME;
1705
1706     s->resync_mb_x =
1707     s->resync_mb_y = -1;
1708
1709     assert(mb_y < s->mb_height);
1710
1711     init_get_bits(&s->gb, *buf, buf_size * 8);
1712
1713     ff_mpeg1_clean_buffers(s);
1714     s->interlaced_dct = 0;
1715
1716     s->qscale = get_qscale(s);
1717
1718     if (s->qscale == 0) {
1719         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1720         return -1;
1721     }
1722
1723     /* extra slice info */
1724     while (get_bits1(&s->gb) != 0)
1725         skip_bits(&s->gb, 8);
1726
1727     s->mb_x = 0;
1728
1729     if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1730         skip_bits1(&s->gb);
1731     } else {
1732         while (get_bits_left(&s->gb) > 0) {
1733             int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1734                                 MBINCR_VLC_BITS, 2);
1735             if (code < 0) {
1736                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1737                 return -1;
1738             }
1739             if (code >= 33) {
1740                 if (code == 33)
1741                     s->mb_x += 33;
1742                 /* otherwise, stuffing, nothing to do */
1743             } else {
1744                 s->mb_x += code;
1745                 break;
1746             }
1747         }
1748     }
1749
1750     if (s->mb_x >= (unsigned) s->mb_width) {
1751         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1752         return -1;
1753     }
1754
1755     if (avctx->hwaccel) {
1756         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1757         int start_code = -1;
1758         buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1759         if (buf_end < *buf + buf_size)
1760             buf_end -= 4;
1761         s->mb_y = mb_y;
1762         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1763             return DECODE_SLICE_ERROR;
1764         *buf = buf_end;
1765         return DECODE_SLICE_OK;
1766     }
1767
1768     s->resync_mb_x = s->mb_x;
1769     s->resync_mb_y = s->mb_y = mb_y;
1770     s->mb_skip_run = 0;
1771     ff_init_block_index(s);
1772
1773     if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1774         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1775             av_log(s->avctx, AV_LOG_DEBUG,
1776                    "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",
1777                    s->qscale,
1778                    s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1779                    s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1780                    s->pict_type  == AV_PICTURE_TYPE_I ? "I" :
1781                    (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1782                    (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1783                    s->progressive_sequence ? "ps"  : "",
1784                    s->progressive_frame    ? "pf"  : "",
1785                    s->alternate_scan       ? "alt" : "",
1786                    s->top_field_first      ? "top" : "",
1787                    s->intra_dc_precision, s->picture_structure,
1788                    s->frame_pred_frame_dct, s->concealment_motion_vectors,
1789                    s->q_scale_type, s->intra_vlc_format,
1790                    s->repeat_first_field, s->chroma_420_type ? "420" : "");
1791         }
1792     }
1793
1794     for (;;) {
1795 #if FF_API_XVMC
1796 FF_DISABLE_DEPRECATION_WARNINGS
1797         // If 1, we memcpy blocks in xvmcvideo.
1798         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1799             ff_xvmc_init_block(s); // set s->block
1800 FF_ENABLE_DEPRECATION_WARNINGS
1801 #endif /* FF_API_XVMC */
1802
1803         if (mpeg_decode_mb(s, s->block) < 0)
1804             return -1;
1805
1806         // Note motion_val is normally NULL unless we want to extract the MVs.
1807         if (s->current_picture.motion_val[0] && !s->encoding) {
1808             const int wrap = s->b8_stride;
1809             int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1810             int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1811             int motion_x, motion_y, dir, i;
1812
1813             for (i = 0; i < 2; i++) {
1814                 for (dir = 0; dir < 2; dir++) {
1815                     if (s->mb_intra ||
1816                         (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1817                         motion_x = motion_y = 0;
1818                     } else if (s->mv_type == MV_TYPE_16X16 ||
1819                                (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1820                         motion_x = s->mv[dir][0][0];
1821                         motion_y = s->mv[dir][0][1];
1822                     } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1823                         motion_x = s->mv[dir][i][0];
1824                         motion_y = s->mv[dir][i][1];
1825                     }
1826
1827                     s->current_picture.motion_val[dir][xy][0]     = motion_x;
1828                     s->current_picture.motion_val[dir][xy][1]     = motion_y;
1829                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1830                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1831                     s->current_picture.ref_index [dir][b8_xy]     =
1832                     s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1833                     assert(s->field_select[dir][i] == 0 ||
1834                            s->field_select[dir][i] == 1);
1835                 }
1836                 xy    += wrap;
1837                 b8_xy += 2;
1838             }
1839         }
1840
1841         s->dest[0] += 16;
1842         s->dest[1] += 16 >> s->chroma_x_shift;
1843         s->dest[2] += 16 >> s->chroma_x_shift;
1844
1845         ff_MPV_decode_mb(s, s->block);
1846
1847         if (++s->mb_x >= s->mb_width) {
1848             const int mb_size = 16;
1849
1850             ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1851             ff_MPV_report_decode_progress(s);
1852
1853             s->mb_x  = 0;
1854             s->mb_y += 1 << field_pic;
1855
1856             if (s->mb_y >= s->mb_height) {
1857                 int left   = get_bits_left(&s->gb);
1858                 int is_d10 = s->chroma_format == 2 &&
1859                              s->pict_type == AV_PICTURE_TYPE_I &&
1860                              avctx->profile == 0 && avctx->level == 5 &&
1861                              s->intra_dc_precision == 2 &&
1862                              s->q_scale_type == 1 && s->alternate_scan == 0 &&
1863                              s->progressive_frame == 0
1864                              /* vbv_delay == 0xBBB || 0xE10 */;
1865
1866                 if (left < 0 ||
1867                     (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1868                     ((avctx->err_recognition & AV_EF_BUFFER) && left > 8)) {
1869                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
1870                            left, show_bits(&s->gb, FFMIN(left, 23)));
1871                     return -1;
1872                 } else
1873                     goto eos;
1874             }
1875
1876             ff_init_block_index(s);
1877         }
1878
1879         /* skip mb handling */
1880         if (s->mb_skip_run == -1) {
1881             /* read increment again */
1882             s->mb_skip_run = 0;
1883             for (;;) {
1884                 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1885                                     MBINCR_VLC_BITS, 2);
1886                 if (code < 0) {
1887                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1888                     return -1;
1889                 }
1890                 if (code >= 33) {
1891                     if (code == 33) {
1892                         s->mb_skip_run += 33;
1893                     } else if (code == 35) {
1894                         if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1895                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1896                             return -1;
1897                         }
1898                         goto eos; /* end of slice */
1899                     }
1900                     /* otherwise, stuffing, nothing to do */
1901                 } else {
1902                     s->mb_skip_run += code;
1903                     break;
1904                 }
1905             }
1906             if (s->mb_skip_run) {
1907                 int i;
1908                 if (s->pict_type == AV_PICTURE_TYPE_I) {
1909                     av_log(s->avctx, AV_LOG_ERROR,
1910                            "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1911                     return -1;
1912                 }
1913
1914                 /* skip mb */
1915                 s->mb_intra = 0;
1916                 for (i = 0; i < 12; i++)
1917                     s->block_last_index[i] = -1;
1918                 if (s->picture_structure == PICT_FRAME)
1919                     s->mv_type = MV_TYPE_16X16;
1920                 else
1921                     s->mv_type = MV_TYPE_FIELD;
1922                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1923                     /* if P type, zero motion vector is implied */
1924                     s->mv_dir             = MV_DIR_FORWARD;
1925                     s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1926                     s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1927                     s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1928                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1929                 } else {
1930                     /* if B type, reuse previous vectors and directions */
1931                     s->mv[0][0][0] = s->last_mv[0][0][0];
1932                     s->mv[0][0][1] = s->last_mv[0][0][1];
1933                     s->mv[1][0][0] = s->last_mv[1][0][0];
1934                     s->mv[1][0][1] = s->last_mv[1][0][1];
1935                 }
1936             }
1937         }
1938     }
1939 eos: // end of slice
1940     *buf += (get_bits_count(&s->gb) - 1) / 8;
1941     av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1942     return 0;
1943 }
1944
1945 static int slice_decode_thread(AVCodecContext *c, void *arg)
1946 {
1947     MpegEncContext *s   = *(void **) arg;
1948     const uint8_t *buf  = s->gb.buffer;
1949     int mb_y            = s->start_mb_y;
1950     const int field_pic = s->picture_structure != PICT_FRAME;
1951
1952     s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1953
1954     for (;;) {
1955         uint32_t start_code;
1956         int ret;
1957
1958         ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1959         emms_c();
1960         av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1961                 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1962                 s->start_mb_y, s->end_mb_y, s->er.error_count);
1963         if (ret < 0) {
1964             if (c->err_recognition & AV_EF_EXPLODE)
1965                 return ret;
1966             if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1967                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1968                                 s->mb_x, s->mb_y,
1969                                 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
1970         } else {
1971             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1972                             s->mb_x - 1, s->mb_y,
1973                             ER_AC_END | ER_DC_END | ER_MV_END);
1974         }
1975
1976         if (s->mb_y == s->end_mb_y)
1977             return 0;
1978
1979         start_code = -1;
1980         buf        = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
1981         mb_y       = (start_code - SLICE_MIN_START_CODE) << field_pic;
1982         if (s->picture_structure == PICT_BOTTOM_FIELD)
1983             mb_y++;
1984         if (mb_y < 0 || mb_y >= s->end_mb_y)
1985             return -1;
1986     }
1987 }
1988
1989 /**
1990  * Handle slice ends.
1991  * @return 1 if it seems to be the last slice
1992  */
1993 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1994 {
1995     Mpeg1Context *s1  = avctx->priv_data;
1996     MpegEncContext *s = &s1->mpeg_enc_ctx;
1997
1998     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1999         return 0;
2000
2001     if (s->avctx->hwaccel) {
2002         if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
2003             av_log(avctx, AV_LOG_ERROR,
2004                    "hardware accelerator failed to decode picture\n");
2005     }
2006
2007 #if FF_API_XVMC
2008 FF_DISABLE_DEPRECATION_WARNINGS
2009     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
2010         ff_xvmc_field_end(s);
2011 FF_ENABLE_DEPRECATION_WARNINGS
2012 #endif /* FF_API_XVMC */
2013
2014     /* end of slice reached */
2015     if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field) {
2016         /* end of image */
2017
2018         ff_er_frame_end(&s->er);
2019
2020         ff_MPV_frame_end(s);
2021
2022         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2023             int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2024             if (ret < 0)
2025                 return ret;
2026             ff_print_debug_info(s, s->current_picture_ptr);
2027         } else {
2028             if (avctx->active_thread_type & FF_THREAD_FRAME)
2029                 s->picture_number++;
2030             /* latency of 1 frame for I- and P-frames */
2031             /* XXX: use another variable than picture_number */
2032             if (s->last_picture_ptr != NULL) {
2033                 int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2034                 if (ret < 0)
2035                     return ret;
2036                 ff_print_debug_info(s, s->last_picture_ptr);
2037             }
2038         }
2039
2040         return 1;
2041     } else {
2042         return 0;
2043     }
2044 }
2045
2046 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2047                                  const uint8_t *buf, int buf_size)
2048 {
2049     Mpeg1Context *s1  = avctx->priv_data;
2050     MpegEncContext *s = &s1->mpeg_enc_ctx;
2051     int width, height;
2052     int i, v, j;
2053
2054     init_get_bits(&s->gb, buf, buf_size * 8);
2055
2056     width  = get_bits(&s->gb, 12);
2057     height = get_bits(&s->gb, 12);
2058     if (width == 0 || height == 0) {
2059         av_log(avctx, AV_LOG_WARNING,
2060                "Invalid horizontal or vertical size value.\n");
2061         if (avctx->err_recognition & AV_EF_BITSTREAM)
2062             return AVERROR_INVALIDDATA;
2063     }
2064     s->aspect_ratio_info = get_bits(&s->gb, 4);
2065     if (s->aspect_ratio_info == 0) {
2066         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2067         if (avctx->err_recognition & AV_EF_BITSTREAM)
2068             return -1;
2069     }
2070     s->frame_rate_index = get_bits(&s->gb, 4);
2071     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2072         return -1;
2073     s->bit_rate = get_bits(&s->gb, 18) * 400;
2074     if (get_bits1(&s->gb) == 0) /* marker */
2075         return -1;
2076     s->width  = width;
2077     s->height = height;
2078
2079     s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2080     skip_bits(&s->gb, 1);
2081
2082     /* get matrix */
2083     if (get_bits1(&s->gb)) {
2084         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2085     } else {
2086         for (i = 0; i < 64; i++) {
2087             j = s->idsp.idct_permutation[i];
2088             v = ff_mpeg1_default_intra_matrix[i];
2089             s->intra_matrix[j]        = v;
2090             s->chroma_intra_matrix[j] = v;
2091         }
2092     }
2093     if (get_bits1(&s->gb)) {
2094         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2095     } else {
2096         for (i = 0; i < 64; i++) {
2097             int j = s->idsp.idct_permutation[i];
2098             v = ff_mpeg1_default_non_intra_matrix[i];
2099             s->inter_matrix[j]        = v;
2100             s->chroma_inter_matrix[j] = v;
2101         }
2102     }
2103
2104     if (show_bits(&s->gb, 23) != 0) {
2105         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2106         return -1;
2107     }
2108
2109     /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2110     s->progressive_sequence = 1;
2111     s->progressive_frame    = 1;
2112     s->picture_structure    = PICT_FRAME;
2113     s->frame_pred_frame_dct = 1;
2114     s->chroma_format        = 1;
2115     s->codec_id             =
2116     s->avctx->codec_id      = AV_CODEC_ID_MPEG1VIDEO;
2117     s->out_format           = FMT_MPEG1;
2118     if (s->flags & CODEC_FLAG_LOW_DELAY)
2119         s->low_delay = 1;
2120
2121     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2122         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2123                s->avctx->rc_buffer_size, s->bit_rate);
2124
2125     return 0;
2126 }
2127
2128 static int vcr2_init_sequence(AVCodecContext *avctx)
2129 {
2130     Mpeg1Context *s1  = avctx->priv_data;
2131     MpegEncContext *s = &s1->mpeg_enc_ctx;
2132     int i, v;
2133
2134     /* start new MPEG-1 context decoding */
2135     s->out_format = FMT_MPEG1;
2136     if (s1->mpeg_enc_ctx_allocated) {
2137         ff_MPV_common_end(s);
2138     }
2139     s->width            = avctx->coded_width;
2140     s->height           = avctx->coded_height;
2141     avctx->has_b_frames = 0; // true?
2142     s->low_delay        = 1;
2143
2144     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2145
2146 #if FF_API_XVMC
2147     if ((avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel) &&
2148         avctx->idct_algo == FF_IDCT_AUTO)
2149 #else
2150     if (avctx->hwaccel && avctx->idct_algo == FF_IDCT_AUTO)
2151 #endif /* FF_API_XVMC */
2152         avctx->idct_algo = FF_IDCT_SIMPLE;
2153
2154     if (ff_MPV_common_init(s) < 0)
2155         return -1;
2156     s1->mpeg_enc_ctx_allocated = 1;
2157
2158     for (i = 0; i < 64; i++) {
2159         int j = s->idsp.idct_permutation[i];
2160         v = ff_mpeg1_default_intra_matrix[i];
2161         s->intra_matrix[j]        = v;
2162         s->chroma_intra_matrix[j] = v;
2163
2164         v = ff_mpeg1_default_non_intra_matrix[i];
2165         s->inter_matrix[j]        = v;
2166         s->chroma_inter_matrix[j] = v;
2167     }
2168
2169     s->progressive_sequence  = 1;
2170     s->progressive_frame     = 1;
2171     s->picture_structure     = PICT_FRAME;
2172     s->frame_pred_frame_dct  = 1;
2173     s->chroma_format         = 1;
2174     s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2175     s1->save_width           = s->width;
2176     s1->save_height          = s->height;
2177     s1->save_progressive_seq = s->progressive_sequence;
2178     return 0;
2179 }
2180
2181 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2182                               const uint8_t *p, int buf_size)
2183 {
2184     Mpeg1Context *s1 = avctx->priv_data;
2185
2186     if (buf_size >= 6 &&
2187         p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2188         p[4] == 3 && (p[5] & 0x40)) {
2189         /* extract A53 Part 4 CC data */
2190         int cc_count = p[5] & 0x1f;
2191         if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2192             av_freep(&s1->a53_caption);
2193             s1->a53_caption_size = cc_count * 3;
2194             s1->a53_caption      = av_malloc(s1->a53_caption_size);
2195             if (s1->a53_caption)
2196                 memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2197         }
2198         return 1;
2199     } else if (buf_size >= 11 &&
2200                p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2201         /* extract DVD CC data */
2202         int cc_count = 0;
2203         int i;
2204         // There is a caption count field in the data, but it is often
2205         // incorect.  So count the number of captions present.
2206         for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2207             cc_count++;
2208         // Transform the DVD format into A53 Part 4 format
2209         if (cc_count > 0) {
2210             av_freep(&s1->a53_caption);
2211             s1->a53_caption_size = cc_count * 6;
2212             s1->a53_caption      = av_malloc(s1->a53_caption_size);
2213             if (s1->a53_caption) {
2214                 uint8_t field1 = !!(p[4] & 0x80);
2215                 uint8_t *cap = s1->a53_caption;
2216                 p += 5;
2217                 for (i = 0; i < cc_count; i++) {
2218                     cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2219                     cap[1] = p[1];
2220                     cap[2] = p[2];
2221                     cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2222                     cap[4] = p[4];
2223                     cap[5] = p[5];
2224                     cap += 6;
2225                     p += 6;
2226                 }
2227             }
2228         }
2229         return 1;
2230     }
2231     return 0;
2232 }
2233
2234 static void mpeg_decode_user_data(AVCodecContext *avctx,
2235                                   const uint8_t *p, int buf_size)
2236 {
2237     const uint8_t *buf_end = p + buf_size;
2238     Mpeg1Context *s1 = avctx->priv_data;
2239
2240     /* we parse the DTG active format information */
2241     if (buf_end - p >= 5 &&
2242         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2243         int flags = p[4];
2244         p += 5;
2245         if (flags & 0x80) {
2246             /* skip event id */
2247             p += 2;
2248         }
2249         if (flags & 0x40) {
2250             if (buf_end - p < 1)
2251                 return;
2252 #if FF_API_AFD
2253             avctx->dtg_active_format = p[0] & 0x0f;
2254 #endif /* FF_API_AFD */
2255             s1->has_afd = 1;
2256             s1->afd     = p[0] & 0x0f;
2257         }
2258     } else if (buf_end - p >= 6 &&
2259                p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2260                p[4] == 0x03) { // S3D_video_format_length
2261         // the 0x7F mask ignores the reserved_bit value
2262         const uint8_t S3D_video_format_type = p[5] & 0x7F;
2263
2264         if (S3D_video_format_type == 0x03 ||
2265             S3D_video_format_type == 0x04 ||
2266             S3D_video_format_type == 0x08 ||
2267             S3D_video_format_type == 0x23) {
2268
2269             s1->has_stereo3d = 1;
2270
2271             switch (S3D_video_format_type) {
2272             case 0x03:
2273                 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2274                 break;
2275             case 0x04:
2276                 s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2277                 break;
2278             case 0x08:
2279                 s1->stereo3d.type = AV_STEREO3D_2D;
2280                 break;
2281             case 0x23:
2282                 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2283                 break;
2284             }
2285         }
2286     } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2287         return;
2288     }
2289 }
2290
2291 static void mpeg_decode_gop(AVCodecContext *avctx,
2292                             const uint8_t *buf, int buf_size)
2293 {
2294     Mpeg1Context *s1  = avctx->priv_data;
2295     MpegEncContext *s = &s1->mpeg_enc_ctx;
2296
2297     int time_code_hours, time_code_minutes;
2298     int time_code_seconds, time_code_pictures;
2299     int broken_link;
2300
2301     init_get_bits(&s->gb, buf, buf_size * 8);
2302
2303     skip_bits1(&s->gb); /* drop_frame_flag */
2304
2305     time_code_hours   = get_bits(&s->gb, 5);
2306     time_code_minutes = get_bits(&s->gb, 6);
2307     skip_bits1(&s->gb); // marker bit
2308     time_code_seconds  = get_bits(&s->gb, 6);
2309     time_code_pictures = get_bits(&s->gb, 6);
2310
2311     s1->closed_gop = get_bits1(&s->gb);
2312     /* broken_link indicate that after editing the
2313      * reference frames of the first B-Frames after GOP I-Frame
2314      * are missing (open gop) */
2315     broken_link = get_bits1(&s->gb);
2316
2317     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2318         av_log(s->avctx, AV_LOG_DEBUG,
2319                "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2320                time_code_hours, time_code_minutes, time_code_seconds,
2321                time_code_pictures, s1->closed_gop, broken_link);
2322 }
2323
2324 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2325                          int *got_output, const uint8_t *buf, int buf_size)
2326 {
2327     Mpeg1Context *s = avctx->priv_data;
2328     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2329     const uint8_t *buf_ptr = buf;
2330     const uint8_t *buf_end = buf + buf_size;
2331     int ret, input_size;
2332     int last_code = 0, skip_frame = 0;
2333
2334     for (;;) {
2335         /* find next start code */
2336         uint32_t start_code = -1;
2337         buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2338         if (start_code > 0x1ff) {
2339             if (!skip_frame) {
2340                 if (HAVE_THREADS &&
2341                     (avctx->active_thread_type & FF_THREAD_SLICE) &&
2342                     !avctx->hwaccel) {
2343                     int i;
2344
2345                     avctx->execute(avctx, slice_decode_thread,
2346                                    &s2->thread_context[0], NULL,
2347                                    s->slice_count, sizeof(void *));
2348                     for (i = 0; i < s->slice_count; i++)
2349                         s2->er.error_count += s2->thread_context[i]->er.error_count;
2350                 }
2351
2352                 ret = slice_end(avctx, picture);
2353                 if (ret < 0)
2354                     return ret;
2355                 else if (ret) {
2356                     // FIXME: merge with the stuff in mpeg_decode_slice
2357                     if (s2->last_picture_ptr || s2->low_delay)
2358                         *got_output = 1;
2359                 }
2360             }
2361             s2->pict_type = 0;
2362             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2363         }
2364
2365         input_size = buf_end - buf_ptr;
2366
2367         if (avctx->debug & FF_DEBUG_STARTCODE)
2368             av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %td left %d\n",
2369                    start_code, buf_ptr - buf, input_size);
2370
2371         /* prepare data for next start code */
2372         switch (start_code) {
2373         case SEQ_START_CODE:
2374             if (last_code == 0) {
2375                 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2376                 s->sync = 1;
2377             } else {
2378                 av_log(avctx, AV_LOG_ERROR,
2379                        "ignoring SEQ_START_CODE after %X\n", last_code);
2380                 if (avctx->err_recognition & AV_EF_EXPLODE)
2381                     return AVERROR_INVALIDDATA;
2382             }
2383             break;
2384
2385         case PICTURE_START_CODE:
2386             if (s2->width <= 0 || s2->height <= 0) {
2387                 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2388                        s2->width, s2->height);
2389                 return AVERROR_INVALIDDATA;
2390             }
2391
2392             if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2393                 !avctx->hwaccel && s->slice_count) {
2394                 int i;
2395
2396                 avctx->execute(avctx, slice_decode_thread,
2397                                s2->thread_context, NULL,
2398                                s->slice_count, sizeof(void *));
2399                 for (i = 0; i < s->slice_count; i++)
2400                     s2->er.error_count += s2->thread_context[i]->er.error_count;
2401                 s->slice_count = 0;
2402             }
2403             if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2404                 ret = mpeg_decode_postinit(avctx);
2405                 if (ret < 0) {
2406                     av_log(avctx, AV_LOG_ERROR,
2407                            "mpeg_decode_postinit() failure\n");
2408                     return ret;
2409                 }
2410
2411                 /* We have a complete image: we try to decompress it. */
2412                 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2413                     s2->pict_type = 0;
2414                 s->first_slice = 1;
2415                 last_code      = PICTURE_START_CODE;
2416             } else {
2417                 av_log(avctx, AV_LOG_ERROR,
2418                        "ignoring pic after %X\n", last_code);
2419                 if (avctx->err_recognition & AV_EF_EXPLODE)
2420                     return AVERROR_INVALIDDATA;
2421             }
2422             break;
2423         case EXT_START_CODE:
2424             init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2425
2426             switch (get_bits(&s2->gb, 4)) {
2427             case 0x1:
2428                 if (last_code == 0) {
2429                     mpeg_decode_sequence_extension(s);
2430                 } else {
2431                     av_log(avctx, AV_LOG_ERROR,
2432                            "ignoring seq ext after %X\n", last_code);
2433                     if (avctx->err_recognition & AV_EF_EXPLODE)
2434                         return AVERROR_INVALIDDATA;
2435                 }
2436                 break;
2437             case 0x2:
2438                 mpeg_decode_sequence_display_extension(s);
2439                 break;
2440             case 0x3:
2441                 mpeg_decode_quant_matrix_extension(s2);
2442                 break;
2443             case 0x7:
2444                 mpeg_decode_picture_display_extension(s);
2445                 break;
2446             case 0x8:
2447                 if (last_code == PICTURE_START_CODE) {
2448                     mpeg_decode_picture_coding_extension(s);
2449                 } else {
2450                     av_log(avctx, AV_LOG_ERROR,
2451                            "ignoring pic cod ext after %X\n", last_code);
2452                     if (avctx->err_recognition & AV_EF_EXPLODE)
2453                         return AVERROR_INVALIDDATA;
2454                 }
2455                 break;
2456             }
2457             break;
2458         case USER_START_CODE:
2459             mpeg_decode_user_data(avctx, buf_ptr, input_size);
2460             break;
2461         case GOP_START_CODE:
2462             if (last_code == 0) {
2463                 s2->first_field = 0;
2464                 mpeg_decode_gop(avctx, buf_ptr, input_size);
2465                 s->sync = 1;
2466             } else {
2467                 av_log(avctx, AV_LOG_ERROR,
2468                        "ignoring GOP_START_CODE after %X\n", last_code);
2469                 if (avctx->err_recognition & AV_EF_EXPLODE)
2470                     return AVERROR_INVALIDDATA;
2471             }
2472             break;
2473         default:
2474             if (start_code >= SLICE_MIN_START_CODE &&
2475                 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2476                 const int field_pic = s2->picture_structure != PICT_FRAME;
2477                 int mb_y = (start_code - SLICE_MIN_START_CODE) << field_pic;
2478                 last_code = SLICE_MIN_START_CODE;
2479
2480                 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2481                     mb_y++;
2482
2483                 if (mb_y >= s2->mb_height) {
2484                     av_log(s2->avctx, AV_LOG_ERROR,
2485                            "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2486                     return -1;
2487                 }
2488
2489                 if (s2->last_picture_ptr == NULL) {
2490                     /* Skip B-frames if we do not have reference frames and
2491                      * GOP is not closed. */
2492                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
2493                         if (!s->closed_gop) {
2494                             skip_frame = 1;
2495                             break;
2496                         }
2497                     }
2498                 }
2499                 if (s2->pict_type == AV_PICTURE_TYPE_I)
2500                     s->sync = 1;
2501                 if (s2->next_picture_ptr == NULL) {
2502                     /* Skip P-frames if we do not have a reference frame or
2503                      * we have an invalid header. */
2504                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2505                         skip_frame = 1;
2506                         break;
2507                     }
2508                 }
2509                 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2510                      s2->pict_type == AV_PICTURE_TYPE_B) ||
2511                     (avctx->skip_frame >= AVDISCARD_NONKEY &&
2512                      s2->pict_type != AV_PICTURE_TYPE_I) ||
2513                     avctx->skip_frame >= AVDISCARD_ALL) {
2514                     skip_frame = 1;
2515                     break;
2516                 }
2517
2518                 if (!s->mpeg_enc_ctx_allocated)
2519                     break;
2520
2521                 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2522                     if (mb_y < avctx->skip_top ||
2523                         mb_y >= s2->mb_height - avctx->skip_bottom)
2524                         break;
2525                 }
2526
2527                 if (!s2->pict_type) {
2528                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2529                     if (avctx->err_recognition & AV_EF_EXPLODE)
2530                         return AVERROR_INVALIDDATA;
2531                     break;
2532                 }
2533
2534                 if (s->first_slice) {
2535                     skip_frame     = 0;
2536                     s->first_slice = 0;
2537                     if (mpeg_field_start(s2, buf, buf_size) < 0)
2538                         return -1;
2539                 }
2540                 if (!s2->current_picture_ptr) {
2541                     av_log(avctx, AV_LOG_ERROR,
2542                            "current_picture not initialized\n");
2543                     return AVERROR_INVALIDDATA;
2544                 }
2545
2546                 if (HAVE_THREADS &&
2547                     (avctx->active_thread_type & FF_THREAD_SLICE) &&
2548                     !avctx->hwaccel) {
2549                     int threshold = (s2->mb_height * s->slice_count +
2550                                      s2->slice_context_count / 2) /
2551                                     s2->slice_context_count;
2552                     if (threshold <= mb_y) {
2553                         MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2554
2555                         thread_context->start_mb_y = mb_y;
2556                         thread_context->end_mb_y   = s2->mb_height;
2557                         if (s->slice_count) {
2558                             s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2559                             ret = ff_update_duplicate_context(thread_context, s2);
2560                             if (ret < 0)
2561                                 return ret;
2562                         }
2563                         init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2564                         s->slice_count++;
2565                     }
2566                     buf_ptr += 2; // FIXME add minimum number of bytes per slice
2567                 } else {
2568                     ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2569                     emms_c();
2570
2571                     if (ret < 0) {
2572                         if (avctx->err_recognition & AV_EF_EXPLODE)
2573                             return ret;
2574                         if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2575                             ff_er_add_slice(&s2->er, s2->resync_mb_x,
2576                                             s2->resync_mb_y, s2->mb_x, s2->mb_y,
2577                                             ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2578                     } else {
2579                         ff_er_add_slice(&s2->er, s2->resync_mb_x,
2580                                         s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2581                                         ER_AC_END | ER_DC_END | ER_MV_END);
2582                     }
2583                 }
2584             }
2585             break;
2586         }
2587     }
2588 }
2589
2590 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2591                              int *got_output, AVPacket *avpkt)
2592 {
2593     const uint8_t *buf = avpkt->data;
2594     int buf_size = avpkt->size;
2595     Mpeg1Context *s = avctx->priv_data;
2596     AVFrame *picture = data;
2597     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2598     av_dlog(avctx, "fill_buffer\n");
2599
2600     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2601         /* special case for last picture */
2602         if (s2->low_delay == 0 && s2->next_picture_ptr) {
2603             int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2604             if (ret < 0)
2605                 return ret;
2606
2607             s2->next_picture_ptr = NULL;
2608
2609             *got_output = 1;
2610         }
2611         return buf_size;
2612     }
2613
2614     if (s2->flags & CODEC_FLAG_TRUNCATED) {
2615         int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2616                                            buf_size, NULL);
2617
2618         if (ff_combine_frame(&s2->parse_context, next,
2619                              (const uint8_t **) &buf, &buf_size) < 0)
2620             return buf_size;
2621     }
2622
2623     if (s->mpeg_enc_ctx_allocated == 0 && avctx->codec_tag == AV_RL32("VCR2"))
2624         vcr2_init_sequence(avctx);
2625
2626     s->slice_count = 0;
2627
2628     if (avctx->extradata && !s->extradata_decoded) {
2629         int ret = decode_chunks(avctx, picture, got_output,
2630                                 avctx->extradata, avctx->extradata_size);
2631         s->extradata_decoded = 1;
2632         if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
2633             return ret;
2634     }
2635
2636     return decode_chunks(avctx, picture, got_output, buf, buf_size);
2637 }
2638
2639 static void flush(AVCodecContext *avctx)
2640 {
2641     Mpeg1Context *s = avctx->priv_data;
2642
2643     s->sync       = 0;
2644     s->closed_gop = 0;
2645
2646     ff_mpeg_flush(avctx);
2647 }
2648
2649 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2650 {
2651     Mpeg1Context *s = avctx->priv_data;
2652
2653     if (s->mpeg_enc_ctx_allocated)
2654         ff_MPV_common_end(&s->mpeg_enc_ctx);
2655     av_freep(&s->a53_caption);
2656     return 0;
2657 }
2658
2659 static const AVProfile mpeg2_video_profiles[] = {
2660     { FF_PROFILE_MPEG2_422,          "4:2:2"              },
2661     { FF_PROFILE_MPEG2_HIGH,         "High"               },
2662     { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
2663     { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
2664     { FF_PROFILE_MPEG2_MAIN,         "Main"               },
2665     { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
2666     { FF_PROFILE_RESERVED,           "Reserved"           },
2667     { FF_PROFILE_RESERVED,           "Reserved"           },
2668     { FF_PROFILE_UNKNOWN                                  },
2669 };
2670
2671 AVCodec ff_mpeg1video_decoder = {
2672     .name                  = "mpeg1video",
2673     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2674     .type                  = AVMEDIA_TYPE_VIDEO,
2675     .id                    = AV_CODEC_ID_MPEG1VIDEO,
2676     .priv_data_size        = sizeof(Mpeg1Context),
2677     .init                  = mpeg_decode_init,
2678     .close                 = mpeg_decode_end,
2679     .decode                = mpeg_decode_frame,
2680     .capabilities          = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2681                              CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2682                              CODEC_CAP_SLICE_THREADS,
2683     .flush                 = flush,
2684     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2685 };
2686
2687 AVCodec ff_mpeg2video_decoder = {
2688     .name           = "mpeg2video",
2689     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2690     .type           = AVMEDIA_TYPE_VIDEO,
2691     .id             = AV_CODEC_ID_MPEG2VIDEO,
2692     .priv_data_size = sizeof(Mpeg1Context),
2693     .init           = mpeg_decode_init,
2694     .close          = mpeg_decode_end,
2695     .decode         = mpeg_decode_frame,
2696     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2697                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2698                       CODEC_CAP_SLICE_THREADS,
2699     .flush          = flush,
2700     .profiles       = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2701 };
2702
2703 #if FF_API_XVMC
2704 #if CONFIG_MPEG_XVMC_DECODER
2705 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2706 {
2707     if (avctx->active_thread_type & FF_THREAD_SLICE)
2708         return -1;
2709     if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2710         return -1;
2711     if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2712         av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2713     }
2714     mpeg_decode_init(avctx);
2715
2716     avctx->pix_fmt           = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2717     avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2718
2719     return 0;
2720 }
2721
2722 AVCodec ff_mpeg_xvmc_decoder = {
2723     .name           = "mpegvideo_xvmc",
2724     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2725     .type           = AVMEDIA_TYPE_VIDEO,
2726     .id             = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2727     .priv_data_size = sizeof(Mpeg1Context),
2728     .init           = mpeg_mc_decode_init,
2729     .close          = mpeg_decode_end,
2730     .decode         = mpeg_decode_frame,
2731     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2732                       CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2733     .flush          = flush,
2734 };
2735
2736 #endif
2737 #endif /* FF_API_XVMC */