vp9: add mxext versions of the single-block (w=4,npx=8) h/v loopfilters.
[ffmpeg.git] / libavcodec / mpeg12dec.c
1 /*
2  * MPEG-1/2 decoder
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  * Copyright (c) 2002-2013 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22
23 /**
24  * @file
25  * MPEG-1/2 decoder
26  */
27
28 #define UNCHECKED_BITSTREAM_READER 1
29 #include <inttypes.h>
30
31 #include "libavutil/attributes.h"
32 #include "libavutil/imgutils.h"
33 #include "libavutil/internal.h"
34 #include "libavutil/stereo3d.h"
35
36 #include "avcodec.h"
37 #include "bytestream.h"
38 #include "error_resilience.h"
39 #include "idctdsp.h"
40 #include "internal.h"
41 #include "mpeg_er.h"
42 #include "mpeg12.h"
43 #include "mpeg12data.h"
44 #include "mpegutils.h"
45 #include "mpegvideo.h"
46 #include "mpegvideodata.h"
47 #include "profiles.h"
48 #include "thread.h"
49 #include "version.h"
50 #include "vdpau_compat.h"
51 #include "xvmc_internal.h"
52
53 typedef struct Mpeg1Context {
54     MpegEncContext mpeg_enc_ctx;
55     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
56     int repeat_field;           /* true if we must repeat the field */
57     AVPanScan pan_scan;         /* some temporary storage for the panscan */
58     AVStereo3D stereo3d;
59     int has_stereo3d;
60     uint8_t *a53_caption;
61     int a53_caption_size;
62     uint8_t afd;
63     int has_afd;
64     int slice_count;
65     AVRational save_aspect;
66     int save_width, save_height, save_progressive_seq;
67     AVRational frame_rate_ext;  /* MPEG-2 specific framerate modificator */
68     int sync;                   /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
69     int tmpgexs;
70     int first_slice;
71     int extradata_decoded;
72 } Mpeg1Context;
73
74 #define MB_TYPE_ZERO_MV   0x20000000
75
76 static const uint32_t ptype2mb_type[7] = {
77                     MB_TYPE_INTRA,
78                     MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
79                     MB_TYPE_L0,
80                     MB_TYPE_L0 | MB_TYPE_CBP,
81     MB_TYPE_QUANT | MB_TYPE_INTRA,
82     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
83     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
84 };
85
86 static const uint32_t btype2mb_type[11] = {
87                     MB_TYPE_INTRA,
88                     MB_TYPE_L1,
89                     MB_TYPE_L1   | MB_TYPE_CBP,
90                     MB_TYPE_L0,
91                     MB_TYPE_L0   | MB_TYPE_CBP,
92                     MB_TYPE_L0L1,
93                     MB_TYPE_L0L1 | MB_TYPE_CBP,
94     MB_TYPE_QUANT | MB_TYPE_INTRA,
95     MB_TYPE_QUANT | MB_TYPE_L1   | MB_TYPE_CBP,
96     MB_TYPE_QUANT | MB_TYPE_L0   | MB_TYPE_CBP,
97     MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
98 };
99
100 /* as H.263, but only 17 codes */
101 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
102 {
103     int code, sign, val, shift;
104
105     code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
106     if (code == 0)
107         return pred;
108     if (code < 0)
109         return 0xffff;
110
111     sign  = get_bits1(&s->gb);
112     shift = fcode - 1;
113     val   = code;
114     if (shift) {
115         val  = (val - 1) << shift;
116         val |= get_bits(&s->gb, shift);
117         val++;
118     }
119     if (sign)
120         val = -val;
121     val += pred;
122
123     /* modulo decoding */
124     return sign_extend(val, 5 + shift);
125 }
126
127 #define MAX_INDEX (64 - 1)
128 #define check_scantable_index(ctx, x)                                         \
129     do {                                                                      \
130         if ((x) > MAX_INDEX) {                                                \
131             av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",     \
132                    ctx->mb_x, ctx->mb_y);                                     \
133             return AVERROR_INVALIDDATA;                                       \
134         }                                                                     \
135     } while (0)
136
137 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
138                                            int16_t *block, int n)
139 {
140     int level, i, j, run;
141     RLTable *rl                  = &ff_rl_mpeg1;
142     uint8_t *const scantable     = s->intra_scantable.permutated;
143     const uint16_t *quant_matrix = s->inter_matrix;
144     const int qscale             = s->qscale;
145
146     {
147         OPEN_READER(re, &s->gb);
148         i = -1;
149         // special case for first coefficient, no need to add second VLC table
150         UPDATE_CACHE(re, &s->gb);
151         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
152             level = (3 * qscale * quant_matrix[0]) >> 5;
153             level = (level - 1) | 1;
154             if (GET_CACHE(re, &s->gb) & 0x40000000)
155                 level = -level;
156             block[0] = level;
157             i++;
158             SKIP_BITS(re, &s->gb, 2);
159             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
160                 goto end;
161         }
162         /* now quantify & encode AC coefficients */
163         for (;;) {
164             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
165                        TEX_VLC_BITS, 2, 0);
166
167             if (level != 0) {
168                 i += run;
169                 if (i > MAX_INDEX)
170                     break;
171                 j = scantable[i];
172                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
173                 level = (level - 1) | 1;
174                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
175                         SHOW_SBITS(re, &s->gb, 1);
176                 SKIP_BITS(re, &s->gb, 1);
177             } else {
178                 /* escape */
179                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
180                 LAST_SKIP_BITS(re, &s->gb, 6);
181                 UPDATE_CACHE(re, &s->gb);
182                 level = SHOW_SBITS(re, &s->gb, 8);
183                 SKIP_BITS(re, &s->gb, 8);
184                 if (level == -128) {
185                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
186                     SKIP_BITS(re, &s->gb, 8);
187                 } else if (level == 0) {
188                     level = SHOW_UBITS(re, &s->gb, 8);
189                     SKIP_BITS(re, &s->gb, 8);
190                 }
191                 i += run;
192                 if (i > MAX_INDEX)
193                     break;
194                 j = scantable[i];
195                 if (level < 0) {
196                     level = -level;
197                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
198                     level = (level - 1) | 1;
199                     level = -level;
200                 } else {
201                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
202                     level = (level - 1) | 1;
203                 }
204             }
205
206             block[j] = level;
207             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
208                 break;
209             UPDATE_CACHE(re, &s->gb);
210         }
211 end:
212         LAST_SKIP_BITS(re, &s->gb, 2);
213         CLOSE_READER(re, &s->gb);
214     }
215
216     check_scantable_index(s, i);
217
218     s->block_last_index[n] = i;
219     return 0;
220 }
221
222 /**
223  * Note: this function can read out of range and crash for corrupt streams.
224  * Changing this would eat up any speed benefits it has.
225  * Do not use "fast" flag if you need the code to be robust.
226  */
227 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
228                                                 int16_t *block, int n)
229 {
230     int level, i, j, run;
231     RLTable *rl              = &ff_rl_mpeg1;
232     uint8_t *const scantable = s->intra_scantable.permutated;
233     const int qscale         = s->qscale;
234
235     {
236         OPEN_READER(re, &s->gb);
237         i = -1;
238         // Special case for first coefficient, no need to add second VLC table.
239         UPDATE_CACHE(re, &s->gb);
240         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
241             level = (3 * qscale) >> 1;
242             level = (level - 1) | 1;
243             if (GET_CACHE(re, &s->gb) & 0x40000000)
244                 level = -level;
245             block[0] = level;
246             i++;
247             SKIP_BITS(re, &s->gb, 2);
248             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
249                 goto end;
250         }
251
252         /* now quantify & encode AC coefficients */
253         for (;;) {
254             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
255                        TEX_VLC_BITS, 2, 0);
256
257             if (level != 0) {
258                 i += run;
259                 if (i > MAX_INDEX)
260                     break;
261                 j = scantable[i];
262                 level = ((level * 2 + 1) * qscale) >> 1;
263                 level = (level - 1) | 1;
264                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
265                         SHOW_SBITS(re, &s->gb, 1);
266                 SKIP_BITS(re, &s->gb, 1);
267             } else {
268                 /* escape */
269                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
270                 LAST_SKIP_BITS(re, &s->gb, 6);
271                 UPDATE_CACHE(re, &s->gb);
272                 level = SHOW_SBITS(re, &s->gb, 8);
273                 SKIP_BITS(re, &s->gb, 8);
274                 if (level == -128) {
275                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
276                     SKIP_BITS(re, &s->gb, 8);
277                 } else if (level == 0) {
278                     level = SHOW_UBITS(re, &s->gb, 8);
279                     SKIP_BITS(re, &s->gb, 8);
280                 }
281                 i += run;
282                 if (i > MAX_INDEX)
283                     break;
284                 j = scantable[i];
285                 if (level < 0) {
286                     level = -level;
287                     level = ((level * 2 + 1) * qscale) >> 1;
288                     level = (level - 1) | 1;
289                     level = -level;
290                 } else {
291                     level = ((level * 2 + 1) * qscale) >> 1;
292                     level = (level - 1) | 1;
293                 }
294             }
295
296             block[j] = level;
297             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
298                 break;
299             UPDATE_CACHE(re, &s->gb);
300         }
301 end:
302         LAST_SKIP_BITS(re, &s->gb, 2);
303         CLOSE_READER(re, &s->gb);
304     }
305
306     check_scantable_index(s, i);
307
308     s->block_last_index[n] = i;
309     return 0;
310 }
311
312 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
313                                                int16_t *block, int n)
314 {
315     int level, i, j, run;
316     RLTable *rl = &ff_rl_mpeg1;
317     uint8_t *const scantable = s->intra_scantable.permutated;
318     const uint16_t *quant_matrix;
319     const int qscale = s->qscale;
320     int mismatch;
321
322     mismatch = 1;
323
324     {
325         OPEN_READER(re, &s->gb);
326         i = -1;
327         if (n < 4)
328             quant_matrix = s->inter_matrix;
329         else
330             quant_matrix = s->chroma_inter_matrix;
331
332         // Special case for first coefficient, no need to add second VLC table.
333         UPDATE_CACHE(re, &s->gb);
334         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
335             level = (3 * qscale * quant_matrix[0]) >> 5;
336             if (GET_CACHE(re, &s->gb) & 0x40000000)
337                 level = -level;
338             block[0]  = level;
339             mismatch ^= level;
340             i++;
341             SKIP_BITS(re, &s->gb, 2);
342             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
343                 goto end;
344         }
345
346         /* now quantify & encode AC coefficients */
347         for (;;) {
348             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
349                        TEX_VLC_BITS, 2, 0);
350
351             if (level != 0) {
352                 i += run;
353                 if (i > MAX_INDEX)
354                     break;
355                 j = scantable[i];
356                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
357                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
358                         SHOW_SBITS(re, &s->gb, 1);
359                 SKIP_BITS(re, &s->gb, 1);
360             } else {
361                 /* escape */
362                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
363                 LAST_SKIP_BITS(re, &s->gb, 6);
364                 UPDATE_CACHE(re, &s->gb);
365                 level = SHOW_SBITS(re, &s->gb, 12);
366                 SKIP_BITS(re, &s->gb, 12);
367
368                 i += run;
369                 if (i > MAX_INDEX)
370                     break;
371                 j = scantable[i];
372                 if (level < 0) {
373                     level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
374                     level = -level;
375                 } else {
376                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
377                 }
378             }
379
380             mismatch ^= level;
381             block[j]  = level;
382             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
383                 break;
384             UPDATE_CACHE(re, &s->gb);
385         }
386 end:
387         LAST_SKIP_BITS(re, &s->gb, 2);
388         CLOSE_READER(re, &s->gb);
389     }
390     block[63] ^= (mismatch & 1);
391
392     check_scantable_index(s, i);
393
394     s->block_last_index[n] = i;
395     return 0;
396 }
397
398 /**
399  * Note: this function can read out of range and crash for corrupt streams.
400  * Changing this would eat up any speed benefits it has.
401  * Do not use "fast" flag if you need the code to be robust.
402  */
403 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
404                                                     int16_t *block, int n)
405 {
406     int level, i, j, run;
407     RLTable *rl              = &ff_rl_mpeg1;
408     uint8_t *const scantable = s->intra_scantable.permutated;
409     const int qscale         = s->qscale;
410     OPEN_READER(re, &s->gb);
411     i = -1;
412
413     // special case for first coefficient, no need to add second VLC table
414     UPDATE_CACHE(re, &s->gb);
415     if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
416         level = (3 * qscale) >> 1;
417         if (GET_CACHE(re, &s->gb) & 0x40000000)
418             level = -level;
419         block[0] = level;
420         i++;
421         SKIP_BITS(re, &s->gb, 2);
422         if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
423             goto end;
424     }
425
426     /* now quantify & encode AC coefficients */
427     for (;;) {
428         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
429
430         if (level != 0) {
431             i += run;
432             if (i > MAX_INDEX)
433                 break;
434             j = scantable[i];
435             level = ((level * 2 + 1) * qscale) >> 1;
436             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
437                     SHOW_SBITS(re, &s->gb, 1);
438             SKIP_BITS(re, &s->gb, 1);
439         } else {
440             /* escape */
441             run = SHOW_UBITS(re, &s->gb, 6) + 1;
442             LAST_SKIP_BITS(re, &s->gb, 6);
443             UPDATE_CACHE(re, &s->gb);
444             level = SHOW_SBITS(re, &s->gb, 12);
445             SKIP_BITS(re, &s->gb, 12);
446
447             i += run;
448             if (i > MAX_INDEX)
449                 break;
450             j = scantable[i];
451             if (level < 0) {
452                 level = ((-level * 2 + 1) * qscale) >> 1;
453                 level = -level;
454             } else {
455                 level = ((level * 2 + 1) * qscale) >> 1;
456             }
457         }
458
459         block[j] = level;
460         if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
461             break;
462
463         UPDATE_CACHE(re, &s->gb);
464     }
465 end:
466     LAST_SKIP_BITS(re, &s->gb, 2);
467     CLOSE_READER(re, &s->gb);
468
469     check_scantable_index(s, i);
470
471     s->block_last_index[n] = i;
472     return 0;
473 }
474
475 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
476                                            int16_t *block, int n)
477 {
478     int level, dc, diff, i, j, run;
479     int component;
480     RLTable *rl;
481     uint8_t *const scantable = s->intra_scantable.permutated;
482     const uint16_t *quant_matrix;
483     const int qscale = s->qscale;
484     int mismatch;
485
486     /* DC coefficient */
487     if (n < 4) {
488         quant_matrix = s->intra_matrix;
489         component    = 0;
490     } else {
491         quant_matrix = s->chroma_intra_matrix;
492         component    = (n & 1) + 1;
493     }
494     diff = decode_dc(&s->gb, component);
495     if (diff >= 0xffff)
496         return AVERROR_INVALIDDATA;
497     dc  = s->last_dc[component];
498     dc += diff;
499     s->last_dc[component] = dc;
500     block[0] = dc << (3 - s->intra_dc_precision);
501     ff_tlog(s->avctx, "dc=%d\n", block[0]);
502     mismatch = block[0] ^ 1;
503     i = 0;
504     if (s->intra_vlc_format)
505         rl = &ff_rl_mpeg2;
506     else
507         rl = &ff_rl_mpeg1;
508
509     {
510         OPEN_READER(re, &s->gb);
511         /* now quantify & encode AC coefficients */
512         for (;;) {
513             UPDATE_CACHE(re, &s->gb);
514             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
515                        TEX_VLC_BITS, 2, 0);
516
517             if (level == 127) {
518                 break;
519             } else if (level != 0) {
520                 i += run;
521                 if (i > MAX_INDEX)
522                     break;
523                 j = scantable[i];
524                 level = (level * qscale * quant_matrix[j]) >> 4;
525                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
526                         SHOW_SBITS(re, &s->gb, 1);
527                 LAST_SKIP_BITS(re, &s->gb, 1);
528             } else {
529                 /* escape */
530                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
531                 LAST_SKIP_BITS(re, &s->gb, 6);
532                 UPDATE_CACHE(re, &s->gb);
533                 level = SHOW_SBITS(re, &s->gb, 12);
534                 SKIP_BITS(re, &s->gb, 12);
535                 i += run;
536                 if (i > MAX_INDEX)
537                     break;
538                 j = scantable[i];
539                 if (level < 0) {
540                     level = (-level * qscale * quant_matrix[j]) >> 4;
541                     level = -level;
542                 } else {
543                     level = (level * qscale * quant_matrix[j]) >> 4;
544                 }
545             }
546
547             mismatch ^= level;
548             block[j]  = level;
549         }
550         CLOSE_READER(re, &s->gb);
551     }
552     block[63] ^= mismatch & 1;
553
554     check_scantable_index(s, i);
555
556     s->block_last_index[n] = i;
557     return 0;
558 }
559
560 /**
561  * Note: this function can read out of range and crash for corrupt streams.
562  * Changing this would eat up any speed benefits it has.
563  * Do not use "fast" flag if you need the code to be robust.
564  */
565 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
566                                                 int16_t *block, int n)
567 {
568     int level, dc, diff, i, j, run;
569     int component;
570     RLTable *rl;
571     uint8_t *const scantable = s->intra_scantable.permutated;
572     const uint16_t *quant_matrix;
573     const int qscale = s->qscale;
574
575     /* DC coefficient */
576     if (n < 4) {
577         quant_matrix = s->intra_matrix;
578         component    = 0;
579     } else {
580         quant_matrix = s->chroma_intra_matrix;
581         component    = (n & 1) + 1;
582     }
583     diff = decode_dc(&s->gb, component);
584     if (diff >= 0xffff)
585         return AVERROR_INVALIDDATA;
586     dc = s->last_dc[component];
587     dc += diff;
588     s->last_dc[component] = dc;
589     block[0] = dc << (3 - s->intra_dc_precision);
590     i = 0;
591     if (s->intra_vlc_format)
592         rl = &ff_rl_mpeg2;
593     else
594         rl = &ff_rl_mpeg1;
595
596     {
597         OPEN_READER(re, &s->gb);
598         /* now quantify & encode AC coefficients */
599         for (;;) {
600             UPDATE_CACHE(re, &s->gb);
601             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
602                        TEX_VLC_BITS, 2, 0);
603
604             if (level >= 64 || i > 63) {
605                 break;
606             } else if (level != 0) {
607                 i += run;
608                 j = scantable[i];
609                 level = (level * qscale * quant_matrix[j]) >> 4;
610                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
611                         SHOW_SBITS(re, &s->gb, 1);
612                 LAST_SKIP_BITS(re, &s->gb, 1);
613             } else {
614                 /* escape */
615                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
616                 LAST_SKIP_BITS(re, &s->gb, 6);
617                 UPDATE_CACHE(re, &s->gb);
618                 level = SHOW_SBITS(re, &s->gb, 12);
619                 SKIP_BITS(re, &s->gb, 12);
620                 i += run;
621                 j = scantable[i];
622                 if (level < 0) {
623                     level = (-level * qscale * quant_matrix[j]) >> 4;
624                     level = -level;
625                 } else {
626                     level = (level * qscale * quant_matrix[j]) >> 4;
627                 }
628             }
629
630             block[j] = level;
631         }
632         CLOSE_READER(re, &s->gb);
633     }
634
635     check_scantable_index(s, i);
636
637     s->block_last_index[n] = i;
638     return 0;
639 }
640
641 /******************************************/
642 /* decoding */
643
644 static inline int get_dmv(MpegEncContext *s)
645 {
646     if (get_bits1(&s->gb))
647         return 1 - (get_bits1(&s->gb) << 1);
648     else
649         return 0;
650 }
651
652 static inline int get_qscale(MpegEncContext *s)
653 {
654     int qscale = get_bits(&s->gb, 5);
655     if (s->q_scale_type)
656         return ff_mpeg2_non_linear_qscale[qscale];
657     else
658         return qscale << 1;
659 }
660
661
662 /* motion type (for MPEG-2) */
663 #define MT_FIELD 1
664 #define MT_FRAME 2
665 #define MT_16X8  2
666 #define MT_DMV   3
667
668 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
669 {
670     int i, j, k, cbp, val, mb_type, motion_type;
671     const int mb_block_count = 4 + (1 << s->chroma_format);
672     int ret;
673
674     ff_tlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
675
676     av_assert2(s->mb_skipped == 0);
677
678     if (s->mb_skip_run-- != 0) {
679         if (s->pict_type == AV_PICTURE_TYPE_P) {
680             s->mb_skipped = 1;
681             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
682                 MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
683         } else {
684             int mb_type;
685
686             if (s->mb_x)
687                 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
688             else
689                 // FIXME not sure if this is allowed in MPEG at all
690                 mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
691             if (IS_INTRA(mb_type)) {
692                 av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
693                 return AVERROR_INVALIDDATA;
694             }
695             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
696                 mb_type | MB_TYPE_SKIP;
697
698             if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
699                 s->mb_skipped = 1;
700         }
701
702         return 0;
703     }
704
705     switch (s->pict_type) {
706     default:
707     case AV_PICTURE_TYPE_I:
708         if (get_bits1(&s->gb) == 0) {
709             if (get_bits1(&s->gb) == 0) {
710                 av_log(s->avctx, AV_LOG_ERROR,
711                        "Invalid mb type in I-frame at %d %d\n",
712                        s->mb_x, s->mb_y);
713                 return AVERROR_INVALIDDATA;
714             }
715             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
716         } else {
717             mb_type = MB_TYPE_INTRA;
718         }
719         break;
720     case AV_PICTURE_TYPE_P:
721         mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
722         if (mb_type < 0) {
723             av_log(s->avctx, AV_LOG_ERROR,
724                    "Invalid mb type in P-frame at %d %d\n", s->mb_x, s->mb_y);
725             return AVERROR_INVALIDDATA;
726         }
727         mb_type = ptype2mb_type[mb_type];
728         break;
729     case AV_PICTURE_TYPE_B:
730         mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
731         if (mb_type < 0) {
732             av_log(s->avctx, AV_LOG_ERROR,
733                    "Invalid mb type in B-frame at %d %d\n", s->mb_x, s->mb_y);
734             return AVERROR_INVALIDDATA;
735         }
736         mb_type = btype2mb_type[mb_type];
737         break;
738     }
739     ff_tlog(s->avctx, "mb_type=%x\n", mb_type);
740 //    motion_type = 0; /* avoid warning */
741     if (IS_INTRA(mb_type)) {
742         s->bdsp.clear_blocks(s->block[0]);
743
744         if (!s->chroma_y_shift)
745             s->bdsp.clear_blocks(s->block[6]);
746
747         /* compute DCT type */
748         // FIXME: add an interlaced_dct coded var?
749         if (s->picture_structure == PICT_FRAME &&
750             !s->frame_pred_frame_dct)
751             s->interlaced_dct = get_bits1(&s->gb);
752
753         if (IS_QUANT(mb_type))
754             s->qscale = get_qscale(s);
755
756         if (s->concealment_motion_vectors) {
757             /* just parse them */
758             if (s->picture_structure != PICT_FRAME)
759                 skip_bits1(&s->gb);  /* field select */
760
761             s->mv[0][0][0]      =
762             s->last_mv[0][0][0] =
763             s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
764                                                      s->last_mv[0][0][0]);
765             s->mv[0][0][1]      =
766             s->last_mv[0][0][1] =
767             s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
768                                                      s->last_mv[0][0][1]);
769
770             check_marker(s->avctx, &s->gb, "after concealment_motion_vectors");
771         } else {
772             /* reset mv prediction */
773             memset(s->last_mv, 0, sizeof(s->last_mv));
774         }
775         s->mb_intra = 1;
776         // if 1, we memcpy blocks in xvmcvideo
777         if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
778             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
779
780         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
781             if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
782                 for (i = 0; i < 6; i++)
783                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
784             } else {
785                 for (i = 0; i < mb_block_count; i++)
786                     if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
787                         return ret;
788             }
789         } else {
790             for (i = 0; i < 6; i++) {
791                 ret = ff_mpeg1_decode_block_intra(&s->gb,
792                                                   s->intra_matrix,
793                                                   s->intra_scantable.permutated,
794                                                   s->last_dc, *s->pblocks[i],
795                                                   i, s->qscale);
796                 if (ret < 0) {
797                     av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
798                            s->mb_x, s->mb_y);
799                     return ret;
800                 }
801
802                 s->block_last_index[i] = ret;
803             }
804         }
805     } else {
806         if (mb_type & MB_TYPE_ZERO_MV) {
807             av_assert2(mb_type & MB_TYPE_CBP);
808
809             s->mv_dir = MV_DIR_FORWARD;
810             if (s->picture_structure == PICT_FRAME) {
811                 if (s->picture_structure == PICT_FRAME
812                     && !s->frame_pred_frame_dct)
813                     s->interlaced_dct = get_bits1(&s->gb);
814                 s->mv_type = MV_TYPE_16X16;
815             } else {
816                 s->mv_type            = MV_TYPE_FIELD;
817                 mb_type              |= MB_TYPE_INTERLACED;
818                 s->field_select[0][0] = s->picture_structure - 1;
819             }
820
821             if (IS_QUANT(mb_type))
822                 s->qscale = get_qscale(s);
823
824             s->last_mv[0][0][0] = 0;
825             s->last_mv[0][0][1] = 0;
826             s->last_mv[0][1][0] = 0;
827             s->last_mv[0][1][1] = 0;
828             s->mv[0][0][0]      = 0;
829             s->mv[0][0][1]      = 0;
830         } else {
831             av_assert2(mb_type & MB_TYPE_L0L1);
832             // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
833             /* get additional motion vector type */
834             if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
835                 motion_type = MT_FRAME;
836             } else {
837                 motion_type = get_bits(&s->gb, 2);
838                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
839                     s->interlaced_dct = get_bits1(&s->gb);
840             }
841
842             if (IS_QUANT(mb_type))
843                 s->qscale = get_qscale(s);
844
845             /* motion vectors */
846             s->mv_dir = (mb_type >> 13) & 3;
847             ff_tlog(s->avctx, "motion_type=%d\n", motion_type);
848             switch (motion_type) {
849             case MT_FRAME: /* or MT_16X8 */
850                 if (s->picture_structure == PICT_FRAME) {
851                     mb_type   |= MB_TYPE_16x16;
852                     s->mv_type = MV_TYPE_16X16;
853                     for (i = 0; i < 2; i++) {
854                         if (USES_LIST(mb_type, i)) {
855                             /* MT_FRAME */
856                             s->mv[i][0][0]      =
857                             s->last_mv[i][0][0] =
858                             s->last_mv[i][1][0] =
859                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0],
860                                                    s->last_mv[i][0][0]);
861                             s->mv[i][0][1]      =
862                             s->last_mv[i][0][1] =
863                             s->last_mv[i][1][1] =
864                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1],
865                                                    s->last_mv[i][0][1]);
866                             /* full_pel: only for MPEG-1 */
867                             if (s->full_pel[i]) {
868                                 s->mv[i][0][0] <<= 1;
869                                 s->mv[i][0][1] <<= 1;
870                             }
871                         }
872                     }
873                 } else {
874                     mb_type   |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
875                     s->mv_type = MV_TYPE_16X8;
876                     for (i = 0; i < 2; i++) {
877                         if (USES_LIST(mb_type, i)) {
878                             /* MT_16X8 */
879                             for (j = 0; j < 2; j++) {
880                                 s->field_select[i][j] = get_bits1(&s->gb);
881                                 for (k = 0; k < 2; k++) {
882                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
883                                                              s->last_mv[i][j][k]);
884                                     s->last_mv[i][j][k] = val;
885                                     s->mv[i][j][k]      = val;
886                                 }
887                             }
888                         }
889                     }
890                 }
891                 break;
892             case MT_FIELD:
893                 s->mv_type = MV_TYPE_FIELD;
894                 if (s->picture_structure == PICT_FRAME) {
895                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
896                     for (i = 0; i < 2; i++) {
897                         if (USES_LIST(mb_type, i)) {
898                             for (j = 0; j < 2; j++) {
899                                 s->field_select[i][j] = get_bits1(&s->gb);
900                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
901                                                          s->last_mv[i][j][0]);
902                                 s->last_mv[i][j][0] = val;
903                                 s->mv[i][j][0]      = val;
904                                 ff_tlog(s->avctx, "fmx=%d\n", val);
905                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
906                                                          s->last_mv[i][j][1] >> 1);
907                                 s->last_mv[i][j][1] = 2 * val;
908                                 s->mv[i][j][1]      = val;
909                                 ff_tlog(s->avctx, "fmy=%d\n", val);
910                             }
911                         }
912                     }
913                 } else {
914                     av_assert0(!s->progressive_sequence);
915                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
916                     for (i = 0; i < 2; i++) {
917                         if (USES_LIST(mb_type, i)) {
918                             s->field_select[i][0] = get_bits1(&s->gb);
919                             for (k = 0; k < 2; k++) {
920                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
921                                                          s->last_mv[i][0][k]);
922                                 s->last_mv[i][0][k] = val;
923                                 s->last_mv[i][1][k] = val;
924                                 s->mv[i][0][k]      = val;
925                             }
926                         }
927                     }
928                 }
929                 break;
930             case MT_DMV:
931                 if (s->progressive_sequence){
932                     av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
933                     return AVERROR_INVALIDDATA;
934                 }
935                 s->mv_type = MV_TYPE_DMV;
936                 for (i = 0; i < 2; i++) {
937                     if (USES_LIST(mb_type, i)) {
938                         int dmx, dmy, mx, my, m;
939                         const int my_shift = s->picture_structure == PICT_FRAME;
940
941                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
942                                                 s->last_mv[i][0][0]);
943                         s->last_mv[i][0][0] = mx;
944                         s->last_mv[i][1][0] = mx;
945                         dmx = get_dmv(s);
946                         my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
947                                                  s->last_mv[i][0][1] >> my_shift);
948                         dmy = get_dmv(s);
949
950
951                         s->last_mv[i][0][1] = my << my_shift;
952                         s->last_mv[i][1][1] = my << my_shift;
953
954                         s->mv[i][0][0] = mx;
955                         s->mv[i][0][1] = my;
956                         s->mv[i][1][0] = mx; // not used
957                         s->mv[i][1][1] = my; // not used
958
959                         if (s->picture_structure == PICT_FRAME) {
960                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
961
962                             // m = 1 + 2 * s->top_field_first;
963                             m = s->top_field_first ? 1 : 3;
964
965                             /* top -> top pred */
966                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
967                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
968                             m = 4 - m;
969                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
970                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
971                         } else {
972                             mb_type |= MB_TYPE_16x16;
973
974                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
975                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
976                             if (s->picture_structure == PICT_TOP_FIELD)
977                                 s->mv[i][2][1]--;
978                             else
979                                 s->mv[i][2][1]++;
980                         }
981                     }
982                 }
983                 break;
984             default:
985                 av_log(s->avctx, AV_LOG_ERROR,
986                        "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
987                 return AVERROR_INVALIDDATA;
988             }
989         }
990
991         s->mb_intra = 0;
992         if (HAS_CBP(mb_type)) {
993             s->bdsp.clear_blocks(s->block[0]);
994
995             cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
996             if (mb_block_count > 6) {
997                 cbp <<= mb_block_count - 6;
998                 cbp  |= get_bits(&s->gb, mb_block_count - 6);
999                 s->bdsp.clear_blocks(s->block[6]);
1000             }
1001             if (cbp <= 0) {
1002                 av_log(s->avctx, AV_LOG_ERROR,
1003                        "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
1004                 return AVERROR_INVALIDDATA;
1005             }
1006
1007             // if 1, we memcpy blocks in xvmcvideo
1008             if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1009                 ff_xvmc_pack_pblocks(s, cbp);
1010
1011             if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1012                 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1013                     for (i = 0; i < 6; i++) {
1014                         if (cbp & 32)
1015                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1016                         else
1017                             s->block_last_index[i] = -1;
1018                         cbp += cbp;
1019                     }
1020                 } else {
1021                     cbp <<= 12 - mb_block_count;
1022
1023                     for (i = 0; i < mb_block_count; i++) {
1024                         if (cbp & (1 << 11)) {
1025                             if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1026                                 return ret;
1027                         } else {
1028                             s->block_last_index[i] = -1;
1029                         }
1030                         cbp += cbp;
1031                     }
1032                 }
1033             } else {
1034                 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1035                     for (i = 0; i < 6; i++) {
1036                         if (cbp & 32)
1037                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1038                         else
1039                             s->block_last_index[i] = -1;
1040                         cbp += cbp;
1041                     }
1042                 } else {
1043                     for (i = 0; i < 6; i++) {
1044                         if (cbp & 32) {
1045                             if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1046                                 return ret;
1047                         } else {
1048                             s->block_last_index[i] = -1;
1049                         }
1050                         cbp += cbp;
1051                     }
1052                 }
1053             }
1054         } else {
1055             for (i = 0; i < 12; i++)
1056                 s->block_last_index[i] = -1;
1057         }
1058     }
1059
1060     s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1061
1062     return 0;
1063 }
1064
1065 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1066 {
1067     Mpeg1Context *s    = avctx->priv_data;
1068     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1069
1070     ff_mpv_decode_defaults(s2);
1071
1072     if (   avctx->codec_tag != AV_RL32("VCR2")
1073         && avctx->codec_tag != AV_RL32("BW10"))
1074         avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1075     ff_mpv_decode_init(s2, avctx);
1076
1077     s->mpeg_enc_ctx.avctx  = avctx;
1078
1079     /* we need some permutation to store matrices,
1080      * until the decoder sets the real permutation. */
1081     ff_mpv_idct_init(s2);
1082     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1083     ff_mpeg12_init_vlcs();
1084
1085     s2->chroma_format              = 1;
1086     s->mpeg_enc_ctx_allocated      = 0;
1087     s->mpeg_enc_ctx.picture_number = 0;
1088     s->repeat_field                = 0;
1089     s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1090     avctx->color_range             = AVCOL_RANGE_MPEG;
1091     return 0;
1092 }
1093
1094 #if HAVE_THREADS
1095 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1096                                              const AVCodecContext *avctx_from)
1097 {
1098     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1099     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1100     int err;
1101
1102     if (avctx == avctx_from               ||
1103         !ctx_from->mpeg_enc_ctx_allocated ||
1104         !s1->context_initialized)
1105         return 0;
1106
1107     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1108     if (err)
1109         return err;
1110
1111     if (!ctx->mpeg_enc_ctx_allocated)
1112         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1113
1114     if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1115         s->picture_number++;
1116
1117     return 0;
1118 }
1119 #endif
1120
1121 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1122                                  const uint8_t *new_perm)
1123 {
1124     uint16_t temp_matrix[64];
1125     int i;
1126
1127     memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1128
1129     for (i = 0; i < 64; i++)
1130         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1131 }
1132
1133 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1134 #if CONFIG_MPEG1_XVMC_HWACCEL
1135     AV_PIX_FMT_XVMC,
1136 #endif
1137 #if CONFIG_MPEG1_VDPAU_DECODER && FF_API_VDPAU
1138     AV_PIX_FMT_VDPAU_MPEG1,
1139 #endif
1140 #if CONFIG_MPEG1_VDPAU_HWACCEL
1141     AV_PIX_FMT_VDPAU,
1142 #endif
1143     AV_PIX_FMT_YUV420P,
1144     AV_PIX_FMT_NONE
1145 };
1146
1147 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1148 #if CONFIG_MPEG2_XVMC_HWACCEL
1149     AV_PIX_FMT_XVMC,
1150 #endif
1151 #if CONFIG_MPEG_VDPAU_DECODER && FF_API_VDPAU
1152     AV_PIX_FMT_VDPAU_MPEG2,
1153 #endif
1154 #if CONFIG_MPEG2_VDPAU_HWACCEL
1155     AV_PIX_FMT_VDPAU,
1156 #endif
1157 #if CONFIG_MPEG2_DXVA2_HWACCEL
1158     AV_PIX_FMT_DXVA2_VLD,
1159 #endif
1160 #if CONFIG_MPEG2_D3D11VA_HWACCEL
1161     AV_PIX_FMT_D3D11VA_VLD,
1162 #endif
1163 #if CONFIG_MPEG2_VAAPI_HWACCEL
1164     AV_PIX_FMT_VAAPI,
1165 #endif
1166 #if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
1167     AV_PIX_FMT_VIDEOTOOLBOX,
1168 #endif
1169     AV_PIX_FMT_YUV420P,
1170     AV_PIX_FMT_NONE
1171 };
1172
1173 static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1174     AV_PIX_FMT_YUV422P,
1175     AV_PIX_FMT_NONE
1176 };
1177
1178 static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1179     AV_PIX_FMT_YUV444P,
1180     AV_PIX_FMT_NONE
1181 };
1182
1183 #if FF_API_VDPAU
1184 static inline int uses_vdpau(AVCodecContext *avctx) {
1185     return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1186 }
1187 #endif
1188
1189 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1190 {
1191     Mpeg1Context *s1  = avctx->priv_data;
1192     MpegEncContext *s = &s1->mpeg_enc_ctx;
1193     const enum AVPixelFormat *pix_fmts;
1194
1195     if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY))
1196         return AV_PIX_FMT_GRAY8;
1197
1198     if (s->chroma_format < 2)
1199         pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1200                                 mpeg1_hwaccel_pixfmt_list_420 :
1201                                 mpeg2_hwaccel_pixfmt_list_420;
1202     else if (s->chroma_format == 2)
1203         pix_fmts = mpeg12_pixfmt_list_422;
1204     else
1205         pix_fmts = mpeg12_pixfmt_list_444;
1206
1207     return ff_thread_get_format(avctx, pix_fmts);
1208 }
1209
1210 static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1211 {
1212     // until then pix_fmt may be changed right after codec init
1213     if (avctx->hwaccel
1214 #if FF_API_VDPAU
1215         || uses_vdpau(avctx)
1216 #endif
1217         )
1218         if (avctx->idct_algo == FF_IDCT_AUTO)
1219             avctx->idct_algo = FF_IDCT_SIMPLE;
1220
1221     if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1222         Mpeg1Context *s1 = avctx->priv_data;
1223         MpegEncContext *s = &s1->mpeg_enc_ctx;
1224
1225         s->pack_pblocks = 1;
1226 #if FF_API_XVMC
1227 FF_DISABLE_DEPRECATION_WARNINGS
1228         avctx->xvmc_acceleration = 2;
1229 FF_ENABLE_DEPRECATION_WARNINGS
1230 #endif /* FF_API_XVMC */
1231     }
1232 }
1233
1234 /* Call this function when we know all parameters.
1235  * It may be called in different places for MPEG-1 and MPEG-2. */
1236 static int mpeg_decode_postinit(AVCodecContext *avctx)
1237 {
1238     Mpeg1Context *s1  = avctx->priv_data;
1239     MpegEncContext *s = &s1->mpeg_enc_ctx;
1240     uint8_t old_permutation[64];
1241     int ret;
1242
1243     if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1244         // MPEG-1 aspect
1245         avctx->sample_aspect_ratio = av_d2q(1.0 / ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1246     } else { // MPEG-2
1247         // MPEG-2 aspect
1248         if (s->aspect_ratio_info > 1) {
1249             AVRational dar =
1250                 av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1251                                   (AVRational) { s1->pan_scan.width,
1252                                                  s1->pan_scan.height }),
1253                          (AVRational) { s->width, s->height });
1254
1255             /* We ignore the spec here and guess a bit as reality does not
1256              * match the spec, see for example res_change_ffmpeg_aspect.ts
1257              * and sequence-display-aspect.mpg.
1258              * issue1613, 621, 562 */
1259             if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1260                 (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1261                  av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1262                 s->avctx->sample_aspect_ratio =
1263                     av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1264                              (AVRational) { s->width, s->height });
1265             } else {
1266                 s->avctx->sample_aspect_ratio =
1267                     av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1268                              (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1269 // issue1613 4/3 16/9 -> 16/9
1270 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1271 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1272 //                s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1273                 ff_dlog(avctx, "aspect A %d/%d\n",
1274                         ff_mpeg2_aspect[s->aspect_ratio_info].num,
1275                         ff_mpeg2_aspect[s->aspect_ratio_info].den);
1276                 ff_dlog(avctx, "aspect B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1277                         s->avctx->sample_aspect_ratio.den);
1278             }
1279         } else {
1280             s->avctx->sample_aspect_ratio =
1281                 ff_mpeg2_aspect[s->aspect_ratio_info];
1282         }
1283     } // MPEG-2
1284
1285     if (av_image_check_sar(s->width, s->height,
1286                            avctx->sample_aspect_ratio) < 0) {
1287         av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
1288                 avctx->sample_aspect_ratio.num,
1289                 avctx->sample_aspect_ratio.den);
1290         avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
1291     }
1292
1293     if ((s1->mpeg_enc_ctx_allocated == 0)                   ||
1294         avctx->coded_width       != s->width                ||
1295         avctx->coded_height      != s->height               ||
1296         s1->save_width           != s->width                ||
1297         s1->save_height          != s->height               ||
1298         av_cmp_q(s1->save_aspect, s->avctx->sample_aspect_ratio) ||
1299         (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1300         0) {
1301         if (s1->mpeg_enc_ctx_allocated) {
1302             ParseContext pc = s->parse_context;
1303             s->parse_context.buffer = 0;
1304             ff_mpv_common_end(s);
1305             s->parse_context = pc;
1306             s1->mpeg_enc_ctx_allocated = 0;
1307         }
1308
1309         ret = ff_set_dimensions(avctx, s->width, s->height);
1310         if (ret < 0)
1311             return ret;
1312
1313         if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1314             avctx->rc_max_rate = s->bit_rate;
1315         } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1316                    (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1317             avctx->bit_rate = s->bit_rate;
1318         }
1319         s1->save_aspect          = s->avctx->sample_aspect_ratio;
1320         s1->save_width           = s->width;
1321         s1->save_height          = s->height;
1322         s1->save_progressive_seq = s->progressive_sequence;
1323
1324         /* low_delay may be forced, in this case we will have B-frames
1325          * that behave like P-frames. */
1326         avctx->has_b_frames = !s->low_delay;
1327
1328         if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1329             // MPEG-1 fps
1330             avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1331             avctx->ticks_per_frame     = 1;
1332
1333             avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1334         } else { // MPEG-2
1335             // MPEG-2 fps
1336             av_reduce(&s->avctx->framerate.num,
1337                       &s->avctx->framerate.den,
1338                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1339                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1340                       1 << 30);
1341             avctx->ticks_per_frame = 2;
1342
1343             switch (s->chroma_format) {
1344             case 1: avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; break;
1345             case 2:
1346             case 3: avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT; break;
1347             default: av_assert0(0);
1348             }
1349         } // MPEG-2
1350
1351         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1352         setup_hwaccel_for_pixfmt(avctx);
1353
1354         /* Quantization matrices may need reordering
1355          * if DCT permutation is changed. */
1356         memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1357
1358         ff_mpv_idct_init(s);
1359         if ((ret = ff_mpv_common_init(s)) < 0)
1360             return ret;
1361
1362         quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->idsp.idct_permutation);
1363         quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->idsp.idct_permutation);
1364         quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1365         quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1366
1367         s1->mpeg_enc_ctx_allocated = 1;
1368     }
1369     return 0;
1370 }
1371
1372 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1373                                 int buf_size)
1374 {
1375     Mpeg1Context *s1  = avctx->priv_data;
1376     MpegEncContext *s = &s1->mpeg_enc_ctx;
1377     int ref, f_code, vbv_delay;
1378
1379     init_get_bits(&s->gb, buf, buf_size * 8);
1380
1381     ref = get_bits(&s->gb, 10); /* temporal ref */
1382     s->pict_type = get_bits(&s->gb, 3);
1383     if (s->pict_type == 0 || s->pict_type > 3)
1384         return AVERROR_INVALIDDATA;
1385
1386     vbv_delay = get_bits(&s->gb, 16);
1387     s->vbv_delay = vbv_delay;
1388     if (s->pict_type == AV_PICTURE_TYPE_P ||
1389         s->pict_type == AV_PICTURE_TYPE_B) {
1390         s->full_pel[0] = get_bits1(&s->gb);
1391         f_code = get_bits(&s->gb, 3);
1392         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1393             return AVERROR_INVALIDDATA;
1394         f_code += !f_code;
1395         s->mpeg_f_code[0][0] = f_code;
1396         s->mpeg_f_code[0][1] = f_code;
1397     }
1398     if (s->pict_type == AV_PICTURE_TYPE_B) {
1399         s->full_pel[1] = get_bits1(&s->gb);
1400         f_code = get_bits(&s->gb, 3);
1401         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1402             return AVERROR_INVALIDDATA;
1403         f_code += !f_code;
1404         s->mpeg_f_code[1][0] = f_code;
1405         s->mpeg_f_code[1][1] = f_code;
1406     }
1407     s->current_picture.f->pict_type = s->pict_type;
1408     s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1409
1410     if (avctx->debug & FF_DEBUG_PICT_INFO)
1411         av_log(avctx, AV_LOG_DEBUG,
1412                "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1413
1414     s->y_dc_scale = 8;
1415     s->c_dc_scale = 8;
1416     return 0;
1417 }
1418
1419 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1420 {
1421     MpegEncContext *s = &s1->mpeg_enc_ctx;
1422     int horiz_size_ext, vert_size_ext;
1423     int bit_rate_ext;
1424
1425     skip_bits(&s->gb, 1); /* profile and level esc*/
1426     s->avctx->profile       = get_bits(&s->gb, 3);
1427     s->avctx->level         = get_bits(&s->gb, 4);
1428     s->progressive_sequence = get_bits1(&s->gb);   /* progressive_sequence */
1429     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1430
1431     if (!s->chroma_format) {
1432         s->chroma_format = 1;
1433         av_log(s->avctx, AV_LOG_WARNING, "Chroma format invalid\n");
1434     }
1435
1436     horiz_size_ext          = get_bits(&s->gb, 2);
1437     vert_size_ext           = get_bits(&s->gb, 2);
1438     s->width  |= (horiz_size_ext << 12);
1439     s->height |= (vert_size_ext  << 12);
1440     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1441     s->bit_rate += (bit_rate_ext << 18) * 400LL;
1442     check_marker(s->avctx, &s->gb, "after bit rate extension");
1443     s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1444
1445     s->low_delay = get_bits1(&s->gb);
1446     if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
1447         s->low_delay = 1;
1448
1449     s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1450     s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1451
1452     ff_dlog(s->avctx, "sequence extension\n");
1453     s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1454
1455     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1456         av_log(s->avctx, AV_LOG_DEBUG,
1457                "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%"PRId64"\n",
1458                s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1459                s->avctx->rc_buffer_size, s->bit_rate);
1460 }
1461
1462 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1463 {
1464     MpegEncContext *s = &s1->mpeg_enc_ctx;
1465     int color_description, w, h;
1466
1467     skip_bits(&s->gb, 3); /* video format */
1468     color_description = get_bits1(&s->gb);
1469     if (color_description) {
1470         s->avctx->color_primaries = get_bits(&s->gb, 8);
1471         s->avctx->color_trc       = get_bits(&s->gb, 8);
1472         s->avctx->colorspace      = get_bits(&s->gb, 8);
1473     }
1474     w = get_bits(&s->gb, 14);
1475     skip_bits(&s->gb, 1); // marker
1476     h = get_bits(&s->gb, 14);
1477     // remaining 3 bits are zero padding
1478
1479     s1->pan_scan.width  = 16 * w;
1480     s1->pan_scan.height = 16 * h;
1481
1482     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1483         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1484 }
1485
1486 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1487 {
1488     MpegEncContext *s = &s1->mpeg_enc_ctx;
1489     int i, nofco;
1490
1491     nofco = 1;
1492     if (s->progressive_sequence) {
1493         if (s->repeat_first_field) {
1494             nofco++;
1495             if (s->top_field_first)
1496                 nofco++;
1497         }
1498     } else {
1499         if (s->picture_structure == PICT_FRAME) {
1500             nofco++;
1501             if (s->repeat_first_field)
1502                 nofco++;
1503         }
1504     }
1505     for (i = 0; i < nofco; i++) {
1506         s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1507         skip_bits(&s->gb, 1); // marker
1508         s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1509         skip_bits(&s->gb, 1); // marker
1510     }
1511
1512     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1513         av_log(s->avctx, AV_LOG_DEBUG,
1514                "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1515                s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1516                s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1517                s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1518 }
1519
1520 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1521                        uint16_t matrix1[64], int intra)
1522 {
1523     int i;
1524
1525     for (i = 0; i < 64; i++) {
1526         int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1527         int v = get_bits(&s->gb, 8);
1528         if (v == 0) {
1529             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1530             return AVERROR_INVALIDDATA;
1531         }
1532         if (intra && i == 0 && v != 8) {
1533             av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1534             v = 8; // needed by pink.mpg / issue1046
1535         }
1536         matrix0[j] = v;
1537         if (matrix1)
1538             matrix1[j] = v;
1539     }
1540     return 0;
1541 }
1542
1543 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1544 {
1545     ff_dlog(s->avctx, "matrix extension\n");
1546
1547     if (get_bits1(&s->gb))
1548         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1549     if (get_bits1(&s->gb))
1550         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1551     if (get_bits1(&s->gb))
1552         load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1553     if (get_bits1(&s->gb))
1554         load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1555 }
1556
1557 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1558 {
1559     MpegEncContext *s = &s1->mpeg_enc_ctx;
1560
1561     s->full_pel[0]       = s->full_pel[1] = 0;
1562     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1563     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1564     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1565     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1566     if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1567         av_log(s->avctx, AV_LOG_ERROR,
1568                "Missing picture start code, guessing missing values\n");
1569         if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1570             if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1571                 s->pict_type = AV_PICTURE_TYPE_I;
1572             else
1573                 s->pict_type = AV_PICTURE_TYPE_P;
1574         } else
1575             s->pict_type = AV_PICTURE_TYPE_B;
1576         s->current_picture.f->pict_type = s->pict_type;
1577         s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1578     }
1579     s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1580     s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1581     s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1582     s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1583
1584     s->intra_dc_precision         = get_bits(&s->gb, 2);
1585     s->picture_structure          = get_bits(&s->gb, 2);
1586     s->top_field_first            = get_bits1(&s->gb);
1587     s->frame_pred_frame_dct       = get_bits1(&s->gb);
1588     s->concealment_motion_vectors = get_bits1(&s->gb);
1589     s->q_scale_type               = get_bits1(&s->gb);
1590     s->intra_vlc_format           = get_bits1(&s->gb);
1591     s->alternate_scan             = get_bits1(&s->gb);
1592     s->repeat_first_field         = get_bits1(&s->gb);
1593     s->chroma_420_type            = get_bits1(&s->gb);
1594     s->progressive_frame          = get_bits1(&s->gb);
1595
1596     if (s->alternate_scan) {
1597         ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1598         ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1599     } else {
1600         ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1601         ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1602     }
1603
1604     /* composite display not parsed */
1605     ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1606     ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1607     ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1608     ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1609     ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1610     ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1611     ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1612     ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1613     ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1614 }
1615
1616 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1617 {
1618     AVCodecContext *avctx = s->avctx;
1619     Mpeg1Context *s1      = (Mpeg1Context *) s;
1620     int ret;
1621
1622     /* start frame decoding */
1623     if (s->first_field || s->picture_structure == PICT_FRAME) {
1624         AVFrameSideData *pan_scan;
1625
1626         if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1627             return ret;
1628
1629         ff_mpeg_er_frame_start(s);
1630
1631         /* first check if we must repeat the frame */
1632         s->current_picture_ptr->f->repeat_pict = 0;
1633         if (s->repeat_first_field) {
1634             if (s->progressive_sequence) {
1635                 if (s->top_field_first)
1636                     s->current_picture_ptr->f->repeat_pict = 4;
1637                 else
1638                     s->current_picture_ptr->f->repeat_pict = 2;
1639             } else if (s->progressive_frame) {
1640                 s->current_picture_ptr->f->repeat_pict = 1;
1641             }
1642         }
1643
1644         pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1645                                           AV_FRAME_DATA_PANSCAN,
1646                                           sizeof(s1->pan_scan));
1647         if (!pan_scan)
1648             return AVERROR(ENOMEM);
1649         memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1650
1651         if (s1->a53_caption) {
1652             AVFrameSideData *sd = av_frame_new_side_data(
1653                 s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1654                 s1->a53_caption_size);
1655             if (sd)
1656                 memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1657             av_freep(&s1->a53_caption);
1658             avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
1659         }
1660
1661         if (s1->has_stereo3d) {
1662             AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1663             if (!stereo)
1664                 return AVERROR(ENOMEM);
1665
1666             *stereo = s1->stereo3d;
1667             s1->has_stereo3d = 0;
1668         }
1669
1670         if (s1->has_afd) {
1671             AVFrameSideData *sd =
1672                 av_frame_new_side_data(s->current_picture_ptr->f,
1673                                        AV_FRAME_DATA_AFD, 1);
1674             if (!sd)
1675                 return AVERROR(ENOMEM);
1676
1677             *sd->data   = s1->afd;
1678             s1->has_afd = 0;
1679         }
1680
1681         if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1682             ff_thread_finish_setup(avctx);
1683     } else { // second field
1684         int i;
1685
1686         if (!s->current_picture_ptr) {
1687             av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1688             return AVERROR_INVALIDDATA;
1689         }
1690
1691         if (s->avctx->hwaccel &&
1692             (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1693             if ((ret = s->avctx->hwaccel->end_frame(s->avctx)) < 0) {
1694                 av_log(avctx, AV_LOG_ERROR,
1695                        "hardware accelerator failed to decode first field\n");
1696                 return ret;
1697             }
1698         }
1699
1700         for (i = 0; i < 4; i++) {
1701             s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1702             if (s->picture_structure == PICT_BOTTOM_FIELD)
1703                 s->current_picture.f->data[i] +=
1704                     s->current_picture_ptr->f->linesize[i];
1705         }
1706     }
1707
1708     if (avctx->hwaccel) {
1709         if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1710             return ret;
1711     }
1712
1713     return 0;
1714 }
1715
1716 #define DECODE_SLICE_ERROR -1
1717 #define DECODE_SLICE_OK     0
1718
1719 /**
1720  * Decode a slice.
1721  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1722  * @return DECODE_SLICE_ERROR if the slice is damaged,
1723  *         DECODE_SLICE_OK if this slice is OK
1724  */
1725 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1726                              const uint8_t **buf, int buf_size)
1727 {
1728     AVCodecContext *avctx = s->avctx;
1729     const int lowres      = s->avctx->lowres;
1730     const int field_pic   = s->picture_structure != PICT_FRAME;
1731     int ret;
1732
1733     s->resync_mb_x =
1734     s->resync_mb_y = -1;
1735
1736     av_assert0(mb_y < s->mb_height);
1737
1738     init_get_bits(&s->gb, *buf, buf_size * 8);
1739     if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1740         skip_bits(&s->gb, 3);
1741
1742     ff_mpeg1_clean_buffers(s);
1743     s->interlaced_dct = 0;
1744
1745     s->qscale = get_qscale(s);
1746
1747     if (s->qscale == 0) {
1748         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1749         return AVERROR_INVALIDDATA;
1750     }
1751
1752     /* extra slice info */
1753     if (skip_1stop_8data_bits(&s->gb) < 0)
1754         return AVERROR_INVALIDDATA;
1755
1756     s->mb_x = 0;
1757
1758     if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1759         skip_bits1(&s->gb);
1760     } else {
1761         while (get_bits_left(&s->gb) > 0) {
1762             int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1763                                 MBINCR_VLC_BITS, 2);
1764             if (code < 0) {
1765                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1766                 return AVERROR_INVALIDDATA;
1767             }
1768             if (code >= 33) {
1769                 if (code == 33)
1770                     s->mb_x += 33;
1771                 /* otherwise, stuffing, nothing to do */
1772             } else {
1773                 s->mb_x += code;
1774                 break;
1775             }
1776         }
1777     }
1778
1779     if (s->mb_x >= (unsigned) s->mb_width) {
1780         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1781         return AVERROR_INVALIDDATA;
1782     }
1783
1784     if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1785         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1786         int start_code = -1;
1787         buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1788         if (buf_end < *buf + buf_size)
1789             buf_end -= 4;
1790         s->mb_y = mb_y;
1791         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1792             return DECODE_SLICE_ERROR;
1793         *buf = buf_end;
1794         return DECODE_SLICE_OK;
1795     }
1796
1797     s->resync_mb_x = s->mb_x;
1798     s->resync_mb_y = s->mb_y = mb_y;
1799     s->mb_skip_run = 0;
1800     ff_init_block_index(s);
1801
1802     if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1803         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1804             av_log(s->avctx, AV_LOG_DEBUG,
1805                    "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",
1806                    s->qscale,
1807                    s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1808                    s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1809                    s->pict_type  == AV_PICTURE_TYPE_I ? "I" :
1810                    (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1811                    (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1812                    s->progressive_sequence ? "ps"  : "",
1813                    s->progressive_frame    ? "pf"  : "",
1814                    s->alternate_scan       ? "alt" : "",
1815                    s->top_field_first      ? "top" : "",
1816                    s->intra_dc_precision, s->picture_structure,
1817                    s->frame_pred_frame_dct, s->concealment_motion_vectors,
1818                    s->q_scale_type, s->intra_vlc_format,
1819                    s->repeat_first_field, s->chroma_420_type ? "420" : "");
1820         }
1821     }
1822
1823     for (;;) {
1824         // If 1, we memcpy blocks in xvmcvideo.
1825         if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1826             ff_xvmc_init_block(s); // set s->block
1827
1828         if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1829             return ret;
1830
1831         // Note motion_val is normally NULL unless we want to extract the MVs.
1832         if (s->current_picture.motion_val[0] && !s->encoding) {
1833             const int wrap = s->b8_stride;
1834             int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1835             int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1836             int motion_x, motion_y, dir, i;
1837
1838             for (i = 0; i < 2; i++) {
1839                 for (dir = 0; dir < 2; dir++) {
1840                     if (s->mb_intra ||
1841                         (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1842                         motion_x = motion_y = 0;
1843                     } else if (s->mv_type == MV_TYPE_16X16 ||
1844                                (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1845                         motion_x = s->mv[dir][0][0];
1846                         motion_y = s->mv[dir][0][1];
1847                     } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1848                         motion_x = s->mv[dir][i][0];
1849                         motion_y = s->mv[dir][i][1];
1850                     }
1851
1852                     s->current_picture.motion_val[dir][xy][0]     = motion_x;
1853                     s->current_picture.motion_val[dir][xy][1]     = motion_y;
1854                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1855                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1856                     s->current_picture.ref_index [dir][b8_xy]     =
1857                     s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1858                     av_assert2(s->field_select[dir][i] == 0 ||
1859                                s->field_select[dir][i] == 1);
1860                 }
1861                 xy    += wrap;
1862                 b8_xy += 2;
1863             }
1864         }
1865
1866         s->dest[0] += 16 >> lowres;
1867         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1868         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1869
1870         ff_mpv_decode_mb(s, s->block);
1871
1872         if (++s->mb_x >= s->mb_width) {
1873             const int mb_size = 16 >> s->avctx->lowres;
1874             int left;
1875
1876             ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1877             ff_mpv_report_decode_progress(s);
1878
1879             s->mb_x  = 0;
1880             s->mb_y += 1 << field_pic;
1881
1882             if (s->mb_y >= s->mb_height) {
1883                 int left   = get_bits_left(&s->gb);
1884                 int is_d10 = s->chroma_format == 2 &&
1885                              s->pict_type == AV_PICTURE_TYPE_I &&
1886                              avctx->profile == 0 && avctx->level == 5 &&
1887                              s->intra_dc_precision == 2 &&
1888                              s->q_scale_type == 1 && s->alternate_scan == 0 &&
1889                              s->progressive_frame == 0
1890                              /* vbv_delay == 0xBBB || 0xE10 */;
1891
1892                 if (left >= 32 && !is_d10) {
1893                     GetBitContext gb = s->gb;
1894                     align_get_bits(&gb);
1895                     if (show_bits(&gb, 24) == 0x060E2B) {
1896                         av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1897                         is_d10 = 1;
1898                     }
1899                     if (left > 32 && show_bits_long(&gb, 32) == 0x201) {
1900                         av_log(avctx, AV_LOG_DEBUG, "skipping m704 alpha (unsupported)\n");
1901                         goto eos;
1902                     }
1903                 }
1904
1905                 if (left < 0 ||
1906                     (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1907                     ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1908                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X at %d %d\n",
1909                            left, left>0 ? show_bits(&s->gb, FFMIN(left, 23)) : 0, s->mb_x, s->mb_y);
1910                     return AVERROR_INVALIDDATA;
1911                 } else
1912                     goto eos;
1913             }
1914             // There are some files out there which are missing the last slice
1915             // in cases where the slice is completely outside the visible
1916             // area, we detect this here instead of running into the end expecting
1917             // more data
1918             left = get_bits_left(&s->gb);
1919             if (s->mb_y >= ((s->height + 15) >> 4) &&
1920                 !s->progressive_sequence &&
1921                 left <= 25 &&
1922                 left >= 0 &&
1923                 s->mb_skip_run == -1 &&
1924                 (!left || show_bits(&s->gb, left) == 0))
1925                 goto eos;
1926
1927             ff_init_block_index(s);
1928         }
1929
1930         /* skip mb handling */
1931         if (s->mb_skip_run == -1) {
1932             /* read increment again */
1933             s->mb_skip_run = 0;
1934             for (;;) {
1935                 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1936                                     MBINCR_VLC_BITS, 2);
1937                 if (code < 0) {
1938                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1939                     return AVERROR_INVALIDDATA;
1940                 }
1941                 if (code >= 33) {
1942                     if (code == 33) {
1943                         s->mb_skip_run += 33;
1944                     } else if (code == 35) {
1945                         if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1946                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1947                             return AVERROR_INVALIDDATA;
1948                         }
1949                         goto eos; /* end of slice */
1950                     }
1951                     /* otherwise, stuffing, nothing to do */
1952                 } else {
1953                     s->mb_skip_run += code;
1954                     break;
1955                 }
1956             }
1957             if (s->mb_skip_run) {
1958                 int i;
1959                 if (s->pict_type == AV_PICTURE_TYPE_I) {
1960                     av_log(s->avctx, AV_LOG_ERROR,
1961                            "skipped MB in I-frame at %d %d\n", s->mb_x, s->mb_y);
1962                     return AVERROR_INVALIDDATA;
1963                 }
1964
1965                 /* skip mb */
1966                 s->mb_intra = 0;
1967                 for (i = 0; i < 12; i++)
1968                     s->block_last_index[i] = -1;
1969                 if (s->picture_structure == PICT_FRAME)
1970                     s->mv_type = MV_TYPE_16X16;
1971                 else
1972                     s->mv_type = MV_TYPE_FIELD;
1973                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1974                     /* if P type, zero motion vector is implied */
1975                     s->mv_dir             = MV_DIR_FORWARD;
1976                     s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1977                     s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1978                     s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1979                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1980                 } else {
1981                     /* if B type, reuse previous vectors and directions */
1982                     s->mv[0][0][0] = s->last_mv[0][0][0];
1983                     s->mv[0][0][1] = s->last_mv[0][0][1];
1984                     s->mv[1][0][0] = s->last_mv[1][0][0];
1985                     s->mv[1][0][1] = s->last_mv[1][0][1];
1986                 }
1987             }
1988         }
1989     }
1990 eos: // end of slice
1991     if (get_bits_left(&s->gb) < 0) {
1992         av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1993         return AVERROR_INVALIDDATA;
1994     }
1995     *buf += (get_bits_count(&s->gb) - 1) / 8;
1996     ff_dlog(s, "Slice start:%d %d  end:%d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1997     return 0;
1998 }
1999
2000 static int slice_decode_thread(AVCodecContext *c, void *arg)
2001 {
2002     MpegEncContext *s   = *(void **) arg;
2003     const uint8_t *buf  = s->gb.buffer;
2004     int mb_y            = s->start_mb_y;
2005     const int field_pic = s->picture_structure != PICT_FRAME;
2006
2007     s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
2008
2009     for (;;) {
2010         uint32_t start_code;
2011         int ret;
2012
2013         ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
2014         emms_c();
2015         ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2016                 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
2017                 s->start_mb_y, s->end_mb_y, s->er.error_count);
2018         if (ret < 0) {
2019             if (c->err_recognition & AV_EF_EXPLODE)
2020                 return ret;
2021             if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2022                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2023                                 s->mb_x, s->mb_y,
2024                                 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2025         } else {
2026             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2027                             s->mb_x - 1, s->mb_y,
2028                             ER_AC_END | ER_DC_END | ER_MV_END);
2029         }
2030
2031         if (s->mb_y == s->end_mb_y)
2032             return 0;
2033
2034         start_code = -1;
2035         buf        = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2036         mb_y       = start_code - SLICE_MIN_START_CODE;
2037         if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2038             mb_y += (*buf&0xE0)<<2;
2039         mb_y <<= field_pic;
2040         if (s->picture_structure == PICT_BOTTOM_FIELD)
2041             mb_y++;
2042         if (mb_y < 0 || mb_y >= s->end_mb_y)
2043             return AVERROR_INVALIDDATA;
2044     }
2045 }
2046
2047 /**
2048  * Handle slice ends.
2049  * @return 1 if it seems to be the last slice
2050  */
2051 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2052 {
2053     Mpeg1Context *s1  = avctx->priv_data;
2054     MpegEncContext *s = &s1->mpeg_enc_ctx;
2055
2056     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2057         return 0;
2058
2059     if (s->avctx->hwaccel) {
2060         int ret = s->avctx->hwaccel->end_frame(s->avctx);
2061         if (ret < 0) {
2062             av_log(avctx, AV_LOG_ERROR,
2063                    "hardware accelerator failed to decode picture\n");
2064             return ret;
2065         }
2066     }
2067
2068     /* end of slice reached */
2069     if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2070         /* end of image */
2071
2072         ff_er_frame_end(&s->er);
2073
2074         ff_mpv_frame_end(s);
2075
2076         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2077             int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2078             if (ret < 0)
2079                 return ret;
2080             ff_print_debug_info(s, s->current_picture_ptr, pict);
2081             ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2082         } else {
2083             if (avctx->active_thread_type & FF_THREAD_FRAME)
2084                 s->picture_number++;
2085             /* latency of 1 frame for I- and P-frames */
2086             /* XXX: use another variable than picture_number */
2087             if (s->last_picture_ptr) {
2088                 int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2089                 if (ret < 0)
2090                     return ret;
2091                 ff_print_debug_info(s, s->last_picture_ptr, pict);
2092                 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2093             }
2094         }
2095
2096         return 1;
2097     } else {
2098         return 0;
2099     }
2100 }
2101
2102 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2103                                  const uint8_t *buf, int buf_size)
2104 {
2105     Mpeg1Context *s1  = avctx->priv_data;
2106     MpegEncContext *s = &s1->mpeg_enc_ctx;
2107     int width, height;
2108     int i, v, j;
2109
2110     init_get_bits(&s->gb, buf, buf_size * 8);
2111
2112     width  = get_bits(&s->gb, 12);
2113     height = get_bits(&s->gb, 12);
2114     if (width == 0 || height == 0) {
2115         av_log(avctx, AV_LOG_WARNING,
2116                "Invalid horizontal or vertical size value.\n");
2117         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2118             return AVERROR_INVALIDDATA;
2119     }
2120     s->aspect_ratio_info = get_bits(&s->gb, 4);
2121     if (s->aspect_ratio_info == 0) {
2122         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2123         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2124             return AVERROR_INVALIDDATA;
2125     }
2126     s->frame_rate_index = get_bits(&s->gb, 4);
2127     if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2128         av_log(avctx, AV_LOG_WARNING,
2129                "frame_rate_index %d is invalid\n", s->frame_rate_index);
2130         s->frame_rate_index = 1;
2131     }
2132     s->bit_rate = get_bits(&s->gb, 18) * 400LL;
2133     if (check_marker(s->avctx, &s->gb, "in sequence header") == 0) {
2134         return AVERROR_INVALIDDATA;
2135     }
2136
2137     s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2138     skip_bits(&s->gb, 1);
2139
2140     /* get matrix */
2141     if (get_bits1(&s->gb)) {
2142         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2143     } else {
2144         for (i = 0; i < 64; i++) {
2145             j = s->idsp.idct_permutation[i];
2146             v = ff_mpeg1_default_intra_matrix[i];
2147             s->intra_matrix[j]        = v;
2148             s->chroma_intra_matrix[j] = v;
2149         }
2150     }
2151     if (get_bits1(&s->gb)) {
2152         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2153     } else {
2154         for (i = 0; i < 64; i++) {
2155             int j = s->idsp.idct_permutation[i];
2156             v = ff_mpeg1_default_non_intra_matrix[i];
2157             s->inter_matrix[j]        = v;
2158             s->chroma_inter_matrix[j] = v;
2159         }
2160     }
2161
2162     if (show_bits(&s->gb, 23) != 0) {
2163         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2164         return AVERROR_INVALIDDATA;
2165     }
2166
2167     s->width  = width;
2168     s->height = height;
2169
2170     /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2171     s->progressive_sequence = 1;
2172     s->progressive_frame    = 1;
2173     s->picture_structure    = PICT_FRAME;
2174     s->first_field          = 0;
2175     s->frame_pred_frame_dct = 1;
2176     s->chroma_format        = 1;
2177     s->codec_id             =
2178     s->avctx->codec_id      = AV_CODEC_ID_MPEG1VIDEO;
2179     s->out_format           = FMT_MPEG1;
2180     s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2181     if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2182         s->low_delay = 1;
2183
2184     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2185         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%"PRId64", aspect_ratio_info: %d \n",
2186                s->avctx->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2187
2188     return 0;
2189 }
2190
2191 static int vcr2_init_sequence(AVCodecContext *avctx)
2192 {
2193     Mpeg1Context *s1  = avctx->priv_data;
2194     MpegEncContext *s = &s1->mpeg_enc_ctx;
2195     int i, v, ret;
2196
2197     /* start new MPEG-1 context decoding */
2198     s->out_format = FMT_MPEG1;
2199     if (s1->mpeg_enc_ctx_allocated) {
2200         ff_mpv_common_end(s);
2201         s1->mpeg_enc_ctx_allocated = 0;
2202     }
2203     s->width            = avctx->coded_width;
2204     s->height           = avctx->coded_height;
2205     avctx->has_b_frames = 0; // true?
2206     s->low_delay        = 1;
2207
2208     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2209     setup_hwaccel_for_pixfmt(avctx);
2210
2211     ff_mpv_idct_init(s);
2212     if ((ret = ff_mpv_common_init(s)) < 0)
2213         return ret;
2214     s1->mpeg_enc_ctx_allocated = 1;
2215
2216     for (i = 0; i < 64; i++) {
2217         int j = s->idsp.idct_permutation[i];
2218         v = ff_mpeg1_default_intra_matrix[i];
2219         s->intra_matrix[j]        = v;
2220         s->chroma_intra_matrix[j] = v;
2221
2222         v = ff_mpeg1_default_non_intra_matrix[i];
2223         s->inter_matrix[j]        = v;
2224         s->chroma_inter_matrix[j] = v;
2225     }
2226
2227     s->progressive_sequence  = 1;
2228     s->progressive_frame     = 1;
2229     s->picture_structure     = PICT_FRAME;
2230     s->first_field           = 0;
2231     s->frame_pred_frame_dct  = 1;
2232     s->chroma_format         = 1;
2233     if (s->codec_tag == AV_RL32("BW10")) {
2234         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2235     } else {
2236         s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2237         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2238     }
2239     s1->save_width           = s->width;
2240     s1->save_height          = s->height;
2241     s1->save_progressive_seq = s->progressive_sequence;
2242     return 0;
2243 }
2244
2245 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2246                               const uint8_t *p, int buf_size)
2247 {
2248     Mpeg1Context *s1 = avctx->priv_data;
2249
2250     if (buf_size >= 6 &&
2251         p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2252         p[4] == 3 && (p[5] & 0x40)) {
2253         /* extract A53 Part 4 CC data */
2254         int cc_count = p[5] & 0x1f;
2255         if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2256             av_freep(&s1->a53_caption);
2257             s1->a53_caption_size = cc_count * 3;
2258             s1->a53_caption      = av_malloc(s1->a53_caption_size);
2259             if (s1->a53_caption)
2260                 memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2261         }
2262         return 1;
2263     } else if (buf_size >= 11 &&
2264                p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2265         /* extract DVD CC data */
2266         int cc_count = 0;
2267         int i;
2268         // There is a caption count field in the data, but it is often
2269         // incorrect.  So count the number of captions present.
2270         for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2271             cc_count++;
2272         // Transform the DVD format into A53 Part 4 format
2273         if (cc_count > 0) {
2274             av_freep(&s1->a53_caption);
2275             s1->a53_caption_size = cc_count * 6;
2276             s1->a53_caption      = av_malloc(s1->a53_caption_size);
2277             if (s1->a53_caption) {
2278                 uint8_t field1 = !!(p[4] & 0x80);
2279                 uint8_t *cap = s1->a53_caption;
2280                 p += 5;
2281                 for (i = 0; i < cc_count; i++) {
2282                     cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2283                     cap[1] = p[1];
2284                     cap[2] = p[2];
2285                     cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2286                     cap[4] = p[4];
2287                     cap[5] = p[5];
2288                     cap += 6;
2289                     p += 6;
2290                 }
2291             }
2292         }
2293         return 1;
2294     }
2295     return 0;
2296 }
2297
2298 static void mpeg_decode_user_data(AVCodecContext *avctx,
2299                                   const uint8_t *p, int buf_size)
2300 {
2301     Mpeg1Context *s = avctx->priv_data;
2302     const uint8_t *buf_end = p + buf_size;
2303     Mpeg1Context *s1 = avctx->priv_data;
2304
2305 #if 0
2306     int i;
2307     for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2308         av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2309     }
2310     av_log(avctx, AV_LOG_ERROR, "\n");
2311 #endif
2312
2313     if (buf_size > 29){
2314         int i;
2315         for(i=0; i<20; i++)
2316             if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2317                 s->tmpgexs= 1;
2318             }
2319     }
2320     /* we parse the DTG active format information */
2321     if (buf_end - p >= 5 &&
2322         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2323         int flags = p[4];
2324         p += 5;
2325         if (flags & 0x80) {
2326             /* skip event id */
2327             p += 2;
2328         }
2329         if (flags & 0x40) {
2330             if (buf_end - p < 1)
2331                 return;
2332 #if FF_API_AFD
2333 FF_DISABLE_DEPRECATION_WARNINGS
2334             avctx->dtg_active_format = p[0] & 0x0f;
2335 FF_ENABLE_DEPRECATION_WARNINGS
2336 #endif /* FF_API_AFD */
2337             s1->has_afd = 1;
2338             s1->afd     = p[0] & 0x0f;
2339         }
2340     } else if (buf_end - p >= 6 &&
2341                p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2342                p[4] == 0x03) { // S3D_video_format_length
2343         // the 0x7F mask ignores the reserved_bit value
2344         const uint8_t S3D_video_format_type = p[5] & 0x7F;
2345
2346         if (S3D_video_format_type == 0x03 ||
2347             S3D_video_format_type == 0x04 ||
2348             S3D_video_format_type == 0x08 ||
2349             S3D_video_format_type == 0x23) {
2350
2351             s1->has_stereo3d = 1;
2352
2353             switch (S3D_video_format_type) {
2354             case 0x03:
2355                 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2356                 break;
2357             case 0x04:
2358                 s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2359                 break;
2360             case 0x08:
2361                 s1->stereo3d.type = AV_STEREO3D_2D;
2362                 break;
2363             case 0x23:
2364                 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2365                 break;
2366             }
2367         }
2368     } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2369         return;
2370     }
2371 }
2372
2373 static void mpeg_decode_gop(AVCodecContext *avctx,
2374                             const uint8_t *buf, int buf_size)
2375 {
2376     Mpeg1Context *s1  = avctx->priv_data;
2377     MpegEncContext *s = &s1->mpeg_enc_ctx;
2378     int broken_link;
2379     int64_t tc;
2380
2381     init_get_bits(&s->gb, buf, buf_size * 8);
2382
2383     tc = s-> timecode_frame_start = get_bits(&s->gb, 25);
2384
2385 #if FF_API_PRIVATE_OPT
2386 FF_DISABLE_DEPRECATION_WARNINGS
2387     avctx->timecode_frame_start = tc;
2388 FF_ENABLE_DEPRECATION_WARNINGS
2389 #endif
2390
2391     s->closed_gop = get_bits1(&s->gb);
2392     /* broken_link indicate that after editing the
2393      * reference frames of the first B-Frames after GOP I-Frame
2394      * are missing (open gop) */
2395     broken_link = get_bits1(&s->gb);
2396
2397     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2398         char tcbuf[AV_TIMECODE_STR_SIZE];
2399         av_timecode_make_mpeg_tc_string(tcbuf, tc);
2400         av_log(s->avctx, AV_LOG_DEBUG,
2401                "GOP (%s) closed_gop=%d broken_link=%d\n",
2402                tcbuf, s->closed_gop, broken_link);
2403     }
2404 }
2405
2406 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2407                          int *got_output, const uint8_t *buf, int buf_size)
2408 {
2409     Mpeg1Context *s = avctx->priv_data;
2410     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2411     const uint8_t *buf_ptr = buf;
2412     const uint8_t *buf_end = buf + buf_size;
2413     int ret, input_size;
2414     int last_code = 0, skip_frame = 0;
2415     int picture_start_code_seen = 0;
2416
2417     for (;;) {
2418         /* find next start code */
2419         uint32_t start_code = -1;
2420         buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2421         if (start_code > 0x1ff) {
2422             if (!skip_frame) {
2423                 if (HAVE_THREADS &&
2424                     (avctx->active_thread_type & FF_THREAD_SLICE) &&
2425                     !avctx->hwaccel) {
2426                     int i;
2427                     av_assert0(avctx->thread_count > 1);
2428
2429                     avctx->execute(avctx, slice_decode_thread,
2430                                    &s2->thread_context[0], NULL,
2431                                    s->slice_count, sizeof(void *));
2432                     for (i = 0; i < s->slice_count; i++)
2433                         s2->er.error_count += s2->thread_context[i]->er.error_count;
2434                 }
2435
2436 #if FF_API_VDPAU
2437                 if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
2438                     && uses_vdpau(avctx))
2439                     ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2440 #endif
2441
2442                 ret = slice_end(avctx, picture);
2443                 if (ret < 0)
2444                     return ret;
2445                 else if (ret) {
2446                     // FIXME: merge with the stuff in mpeg_decode_slice
2447                     if (s2->last_picture_ptr || s2->low_delay)
2448                         *got_output = 1;
2449                 }
2450             }
2451             s2->pict_type = 0;
2452
2453             if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2454                 return AVERROR_INVALIDDATA;
2455
2456             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2457         }
2458
2459         input_size = buf_end - buf_ptr;
2460
2461         if (avctx->debug & FF_DEBUG_STARTCODE)
2462             av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2463                    start_code, buf_ptr - buf, input_size);
2464
2465         /* prepare data for next start code */
2466         switch (start_code) {
2467         case SEQ_START_CODE:
2468             if (last_code == 0) {
2469                 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2470                 if (buf != avctx->extradata)
2471                     s->sync = 1;
2472             } else {
2473                 av_log(avctx, AV_LOG_ERROR,
2474                        "ignoring SEQ_START_CODE after %X\n", last_code);
2475                 if (avctx->err_recognition & AV_EF_EXPLODE)
2476                     return AVERROR_INVALIDDATA;
2477             }
2478             break;
2479
2480         case PICTURE_START_CODE:
2481             if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2482                /* If it's a frame picture, there can't be more than one picture header.
2483                   Yet, it does happen and we need to handle it. */
2484                av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2485                break;
2486             }
2487             picture_start_code_seen = 1;
2488
2489             if (s2->width <= 0 || s2->height <= 0) {
2490                 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2491                        s2->width, s2->height);
2492                 return AVERROR_INVALIDDATA;
2493             }
2494
2495             if (s->tmpgexs){
2496                 s2->intra_dc_precision= 3;
2497                 s2->intra_matrix[0]= 1;
2498             }
2499             if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2500                 !avctx->hwaccel && s->slice_count) {
2501                 int i;
2502
2503                 avctx->execute(avctx, slice_decode_thread,
2504                                s2->thread_context, NULL,
2505                                s->slice_count, sizeof(void *));
2506                 for (i = 0; i < s->slice_count; i++)
2507                     s2->er.error_count += s2->thread_context[i]->er.error_count;
2508                 s->slice_count = 0;
2509             }
2510             if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2511                 ret = mpeg_decode_postinit(avctx);
2512                 if (ret < 0) {
2513                     av_log(avctx, AV_LOG_ERROR,
2514                            "mpeg_decode_postinit() failure\n");
2515                     return ret;
2516                 }
2517
2518                 /* We have a complete image: we try to decompress it. */
2519                 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2520                     s2->pict_type = 0;
2521                 s->first_slice = 1;
2522                 last_code      = PICTURE_START_CODE;
2523             } else {
2524                 av_log(avctx, AV_LOG_ERROR,
2525                        "ignoring pic after %X\n", last_code);
2526                 if (avctx->err_recognition & AV_EF_EXPLODE)
2527                     return AVERROR_INVALIDDATA;
2528             }
2529             break;
2530         case EXT_START_CODE:
2531             init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2532
2533             switch (get_bits(&s2->gb, 4)) {
2534             case 0x1:
2535                 if (last_code == 0) {
2536                     mpeg_decode_sequence_extension(s);
2537                 } else {
2538                     av_log(avctx, AV_LOG_ERROR,
2539                            "ignoring seq ext after %X\n", last_code);
2540                     if (avctx->err_recognition & AV_EF_EXPLODE)
2541                         return AVERROR_INVALIDDATA;
2542                 }
2543                 break;
2544             case 0x2:
2545                 mpeg_decode_sequence_display_extension(s);
2546                 break;
2547             case 0x3:
2548                 mpeg_decode_quant_matrix_extension(s2);
2549                 break;
2550             case 0x7:
2551                 mpeg_decode_picture_display_extension(s);
2552                 break;
2553             case 0x8:
2554                 if (last_code == PICTURE_START_CODE) {
2555                     mpeg_decode_picture_coding_extension(s);
2556                 } else {
2557                     av_log(avctx, AV_LOG_ERROR,
2558                            "ignoring pic cod ext after %X\n", last_code);
2559                     if (avctx->err_recognition & AV_EF_EXPLODE)
2560                         return AVERROR_INVALIDDATA;
2561                 }
2562                 break;
2563             }
2564             break;
2565         case USER_START_CODE:
2566             mpeg_decode_user_data(avctx, buf_ptr, input_size);
2567             break;
2568         case GOP_START_CODE:
2569             if (last_code == 0) {
2570                 s2->first_field = 0;
2571                 mpeg_decode_gop(avctx, buf_ptr, input_size);
2572                 s->sync = 1;
2573             } else {
2574                 av_log(avctx, AV_LOG_ERROR,
2575                        "ignoring GOP_START_CODE after %X\n", last_code);
2576                 if (avctx->err_recognition & AV_EF_EXPLODE)
2577                     return AVERROR_INVALIDDATA;
2578             }
2579             break;
2580         default:
2581             if (start_code >= SLICE_MIN_START_CODE &&
2582                 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2583                 if (s2->progressive_sequence && !s2->progressive_frame) {
2584                     s2->progressive_frame = 1;
2585                     av_log(s2->avctx, AV_LOG_ERROR,
2586                            "interlaced frame in progressive sequence, ignoring\n");
2587                 }
2588
2589                 if (s2->picture_structure == 0 ||
2590                     (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2591                     av_log(s2->avctx, AV_LOG_ERROR,
2592                            "picture_structure %d invalid, ignoring\n",
2593                            s2->picture_structure);
2594                     s2->picture_structure = PICT_FRAME;
2595                 }
2596
2597                 if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2598                     av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2599
2600                 if (s2->picture_structure == PICT_FRAME) {
2601                     s2->first_field = 0;
2602                     s2->v_edge_pos  = 16 * s2->mb_height;
2603                 } else {
2604                     s2->first_field ^= 1;
2605                     s2->v_edge_pos   = 8 * s2->mb_height;
2606                     memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2607                 }
2608             }
2609             if (start_code >= SLICE_MIN_START_CODE &&
2610                 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2611                 const int field_pic = s2->picture_structure != PICT_FRAME;
2612                 int mb_y = start_code - SLICE_MIN_START_CODE;
2613                 last_code = SLICE_MIN_START_CODE;
2614                 if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2615                     mb_y += (*buf_ptr&0xE0)<<2;
2616
2617                 mb_y <<= field_pic;
2618                 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2619                     mb_y++;
2620
2621                 if (buf_end - buf_ptr < 2) {
2622                     av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2623                     return AVERROR_INVALIDDATA;
2624                 }
2625
2626                 if (mb_y >= s2->mb_height) {
2627                     av_log(s2->avctx, AV_LOG_ERROR,
2628                            "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2629                     return AVERROR_INVALIDDATA;
2630                 }
2631
2632                 if (!s2->last_picture_ptr) {
2633                     /* Skip B-frames if we do not have reference frames and
2634                      * GOP is not closed. */
2635                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
2636                         if (!s2->closed_gop) {
2637                             skip_frame = 1;
2638                             break;
2639                         }
2640                     }
2641                 }
2642                 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL))
2643                     s->sync = 1;
2644                 if (!s2->next_picture_ptr) {
2645                     /* Skip P-frames if we do not have a reference frame or
2646                      * we have an invalid header. */
2647                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2648                         skip_frame = 1;
2649                         break;
2650                     }
2651                 }
2652                 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2653                      s2->pict_type == AV_PICTURE_TYPE_B) ||
2654                     (avctx->skip_frame >= AVDISCARD_NONKEY &&
2655                      s2->pict_type != AV_PICTURE_TYPE_I) ||
2656                     avctx->skip_frame >= AVDISCARD_ALL) {
2657                     skip_frame = 1;
2658                     break;
2659                 }
2660
2661                 if (!s->mpeg_enc_ctx_allocated)
2662                     break;
2663
2664                 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2665                     if (mb_y < avctx->skip_top ||
2666                         mb_y >= s2->mb_height - avctx->skip_bottom)
2667                         break;
2668                 }
2669
2670                 if (!s2->pict_type) {
2671                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2672                     if (avctx->err_recognition & AV_EF_EXPLODE)
2673                         return AVERROR_INVALIDDATA;
2674                     break;
2675                 }
2676
2677                 if (s->first_slice) {
2678                     skip_frame     = 0;
2679                     s->first_slice = 0;
2680                     if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2681                         return ret;
2682                 }
2683                 if (!s2->current_picture_ptr) {
2684                     av_log(avctx, AV_LOG_ERROR,
2685                            "current_picture not initialized\n");
2686                     return AVERROR_INVALIDDATA;
2687                 }
2688
2689 #if FF_API_VDPAU
2690                 if (uses_vdpau(avctx)) {
2691                     s->slice_count++;
2692                     break;
2693                 }
2694 #endif
2695
2696                 if (HAVE_THREADS &&
2697                     (avctx->active_thread_type & FF_THREAD_SLICE) &&
2698                     !avctx->hwaccel) {
2699                     int threshold = (s2->mb_height * s->slice_count +
2700                                      s2->slice_context_count / 2) /
2701                                     s2->slice_context_count;
2702                     av_assert0(avctx->thread_count > 1);
2703                     if (threshold <= mb_y) {
2704                         MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2705
2706                         thread_context->start_mb_y = mb_y;
2707                         thread_context->end_mb_y   = s2->mb_height;
2708                         if (s->slice_count) {
2709                             s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2710                             ret = ff_update_duplicate_context(thread_context, s2);
2711                             if (ret < 0)
2712                                 return ret;
2713                         }
2714                         init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2715                         s->slice_count++;
2716                     }
2717                     buf_ptr += 2; // FIXME add minimum number of bytes per slice
2718                 } else {
2719                     ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2720                     emms_c();
2721
2722                     if (ret < 0) {
2723                         if (avctx->err_recognition & AV_EF_EXPLODE)
2724                             return ret;
2725                         if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2726                             ff_er_add_slice(&s2->er, s2->resync_mb_x,
2727                                             s2->resync_mb_y, s2->mb_x, s2->mb_y,
2728                                             ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2729                     } else {
2730                         ff_er_add_slice(&s2->er, s2->resync_mb_x,
2731                                         s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2732                                         ER_AC_END | ER_DC_END | ER_MV_END);
2733                     }
2734                 }
2735             }
2736             break;
2737         }
2738     }
2739 }
2740
2741 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2742                              int *got_output, AVPacket *avpkt)
2743 {
2744     const uint8_t *buf = avpkt->data;
2745     int ret;
2746     int buf_size = avpkt->size;
2747     Mpeg1Context *s = avctx->priv_data;
2748     AVFrame *picture = data;
2749     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2750
2751     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2752         /* special case for last picture */
2753         if (s2->low_delay == 0 && s2->next_picture_ptr) {
2754             int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2755             if (ret < 0)
2756                 return ret;
2757
2758             s2->next_picture_ptr = NULL;
2759
2760             *got_output = 1;
2761         }
2762         return buf_size;
2763     }
2764
2765     if (s2->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
2766         int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2767                                            buf_size, NULL);
2768
2769         if (ff_combine_frame(&s2->parse_context, next,
2770                              (const uint8_t **) &buf, &buf_size) < 0)
2771             return buf_size;
2772     }
2773
2774     s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2775     if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2776                                            || s2->codec_tag == AV_RL32("BW10")
2777                                           ))
2778         vcr2_init_sequence(avctx);
2779
2780     s->slice_count = 0;
2781
2782     if (avctx->extradata && !s->extradata_decoded) {
2783         ret = decode_chunks(avctx, picture, got_output,
2784                             avctx->extradata, avctx->extradata_size);
2785         if (*got_output) {
2786             av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2787             *got_output = 0;
2788         }
2789         s->extradata_decoded = 1;
2790         if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2791             s2->current_picture_ptr = NULL;
2792             return ret;
2793         }
2794     }
2795
2796     ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2797     if (ret<0 || *got_output) {
2798         s2->current_picture_ptr = NULL;
2799
2800         if (s2->timecode_frame_start != -1 && *got_output) {
2801             AVFrameSideData *tcside = av_frame_new_side_data(picture,
2802                                                              AV_FRAME_DATA_GOP_TIMECODE,
2803                                                              sizeof(int64_t));
2804             if (!tcside)
2805                 return AVERROR(ENOMEM);
2806             memcpy(tcside->data, &s2->timecode_frame_start, sizeof(int64_t));
2807
2808             s2->timecode_frame_start = -1;
2809         }
2810     }
2811
2812     return ret;
2813 }
2814
2815 static void flush(AVCodecContext *avctx)
2816 {
2817     Mpeg1Context *s = avctx->priv_data;
2818
2819     s->sync       = 0;
2820
2821     ff_mpeg_flush(avctx);
2822 }
2823
2824 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2825 {
2826     Mpeg1Context *s = avctx->priv_data;
2827
2828     if (s->mpeg_enc_ctx_allocated)
2829         ff_mpv_common_end(&s->mpeg_enc_ctx);
2830     av_freep(&s->a53_caption);
2831     return 0;
2832 }
2833
2834 AVCodec ff_mpeg1video_decoder = {
2835     .name                  = "mpeg1video",
2836     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2837     .type                  = AVMEDIA_TYPE_VIDEO,
2838     .id                    = AV_CODEC_ID_MPEG1VIDEO,
2839     .priv_data_size        = sizeof(Mpeg1Context),
2840     .init                  = mpeg_decode_init,
2841     .close                 = mpeg_decode_end,
2842     .decode                = mpeg_decode_frame,
2843     .capabilities          = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2844                              AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2845                              AV_CODEC_CAP_SLICE_THREADS,
2846     .flush                 = flush,
2847     .max_lowres            = 3,
2848     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2849 };
2850
2851 AVCodec ff_mpeg2video_decoder = {
2852     .name           = "mpeg2video",
2853     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2854     .type           = AVMEDIA_TYPE_VIDEO,
2855     .id             = AV_CODEC_ID_MPEG2VIDEO,
2856     .priv_data_size = sizeof(Mpeg1Context),
2857     .init           = mpeg_decode_init,
2858     .close          = mpeg_decode_end,
2859     .decode         = mpeg_decode_frame,
2860     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2861                       AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2862                       AV_CODEC_CAP_SLICE_THREADS,
2863     .flush          = flush,
2864     .max_lowres     = 3,
2865     .profiles       = NULL_IF_CONFIG_SMALL(ff_mpeg2_video_profiles),
2866 };
2867
2868 //legacy decoder
2869 AVCodec ff_mpegvideo_decoder = {
2870     .name           = "mpegvideo",
2871     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2872     .type           = AVMEDIA_TYPE_VIDEO,
2873     .id             = AV_CODEC_ID_MPEG2VIDEO,
2874     .priv_data_size = sizeof(Mpeg1Context),
2875     .init           = mpeg_decode_init,
2876     .close          = mpeg_decode_end,
2877     .decode         = mpeg_decode_frame,
2878     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
2879     .flush          = flush,
2880     .max_lowres     = 3,
2881 };
2882
2883 #if FF_API_XVMC
2884 #if CONFIG_MPEG_XVMC_DECODER
2885 FF_DISABLE_DEPRECATION_WARNINGS
2886 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2887 {
2888     if (avctx->active_thread_type & FF_THREAD_SLICE)
2889         return -1;
2890     if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2891         return -1;
2892     if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2893         ff_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2894     }
2895     mpeg_decode_init(avctx);
2896
2897     avctx->pix_fmt           = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2898     avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2899
2900     return 0;
2901 }
2902
2903 AVCodec ff_mpeg_xvmc_decoder = {
2904     .name           = "mpegvideo_xvmc",
2905     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2906     .type           = AVMEDIA_TYPE_VIDEO,
2907     .id             = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2908     .priv_data_size = sizeof(Mpeg1Context),
2909     .init           = mpeg_mc_decode_init,
2910     .close          = mpeg_decode_end,
2911     .decode         = mpeg_decode_frame,
2912     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2913                       AV_CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL |
2914                       AV_CODEC_CAP_DELAY,
2915     .flush          = flush,
2916 };
2917 FF_ENABLE_DEPRECATION_WARNINGS
2918 #endif
2919 #endif /* FF_API_XVMC */
2920
2921 #if CONFIG_MPEG_VDPAU_DECODER && FF_API_VDPAU
2922 AVCodec ff_mpeg_vdpau_decoder = {
2923     .name           = "mpegvideo_vdpau",
2924     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2925     .type           = AVMEDIA_TYPE_VIDEO,
2926     .id             = AV_CODEC_ID_MPEG2VIDEO,
2927     .priv_data_size = sizeof(Mpeg1Context),
2928     .init           = mpeg_decode_init,
2929     .close          = mpeg_decode_end,
2930     .decode         = mpeg_decode_frame,
2931     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED |
2932                       AV_CODEC_CAP_HWACCEL_VDPAU | AV_CODEC_CAP_DELAY,
2933     .flush          = flush,
2934 };
2935 #endif
2936
2937 #if CONFIG_MPEG1_VDPAU_DECODER && FF_API_VDPAU
2938 AVCodec ff_mpeg1_vdpau_decoder = {
2939     .name           = "mpeg1video_vdpau",
2940     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2941     .type           = AVMEDIA_TYPE_VIDEO,
2942     .id             = AV_CODEC_ID_MPEG1VIDEO,
2943     .priv_data_size = sizeof(Mpeg1Context),
2944     .init           = mpeg_decode_init,
2945     .close          = mpeg_decode_end,
2946     .decode         = mpeg_decode_frame,
2947     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED |
2948                       AV_CODEC_CAP_HWACCEL_VDPAU | AV_CODEC_CAP_DELAY,
2949     .flush          = flush,
2950 };
2951 #endif