avcodec/mpeg12dec: Fix decoding of faulty interlaced mpeg2
[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 "thread.h"
48 #include "version.h"
49 #include "vdpau_compat.h"
50 #include "xvmc_internal.h"
51
52 typedef struct Mpeg1Context {
53     MpegEncContext mpeg_enc_ctx;
54     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
55     int repeat_field;           /* true if we must repeat the field */
56     AVPanScan pan_scan;         /* some temporary storage for the panscan */
57     AVStereo3D stereo3d;
58     int has_stereo3d;
59     uint8_t *a53_caption;
60     int a53_caption_size;
61     uint8_t afd;
62     int has_afd;
63     int slice_count;
64     AVRational save_aspect;
65     int save_width, save_height, save_progressive_seq;
66     AVRational frame_rate_ext;  /* MPEG-2 specific framerate modificator */
67     int sync;                   /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
68     int tmpgexs;
69     int first_slice;
70     int extradata_decoded;
71 } Mpeg1Context;
72
73 #define MB_TYPE_ZERO_MV   0x20000000
74
75 static const uint32_t ptype2mb_type[7] = {
76                     MB_TYPE_INTRA,
77                     MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
78                     MB_TYPE_L0,
79                     MB_TYPE_L0 | MB_TYPE_CBP,
80     MB_TYPE_QUANT | MB_TYPE_INTRA,
81     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
82     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
83 };
84
85 static const uint32_t btype2mb_type[11] = {
86                     MB_TYPE_INTRA,
87                     MB_TYPE_L1,
88                     MB_TYPE_L1   | MB_TYPE_CBP,
89                     MB_TYPE_L0,
90                     MB_TYPE_L0   | MB_TYPE_CBP,
91                     MB_TYPE_L0L1,
92                     MB_TYPE_L0L1 | MB_TYPE_CBP,
93     MB_TYPE_QUANT | MB_TYPE_INTRA,
94     MB_TYPE_QUANT | MB_TYPE_L1   | MB_TYPE_CBP,
95     MB_TYPE_QUANT | MB_TYPE_L0   | MB_TYPE_CBP,
96     MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
97 };
98
99 static const uint8_t non_linear_qscale[32] = {
100      0,  1,  2,  3,  4,  5,   6,   7,
101      8, 10, 12, 14, 16, 18,  20,  22,
102     24, 28, 32, 36, 40, 44,  48,  52,
103     56, 64, 72, 80, 88, 96, 104, 112,
104 };
105
106 /* as H.263, but only 17 codes */
107 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
108 {
109     int code, sign, val, shift;
110
111     code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
112     if (code == 0)
113         return pred;
114     if (code < 0)
115         return 0xffff;
116
117     sign  = get_bits1(&s->gb);
118     shift = fcode - 1;
119     val   = code;
120     if (shift) {
121         val  = (val - 1) << shift;
122         val |= get_bits(&s->gb, shift);
123         val++;
124     }
125     if (sign)
126         val = -val;
127     val += pred;
128
129     /* modulo decoding */
130     return sign_extend(val, 5 + shift);
131 }
132
133 #define check_scantable_index(ctx, x)                                         \
134     do {                                                                      \
135         if ((x) > 63) {                                                       \
136             av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",     \
137                    ctx->mb_x, ctx->mb_y);                                     \
138             return AVERROR_INVALIDDATA;                                       \
139         }                                                                     \
140     } while (0)
141
142 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
143                                            int16_t *block, int n)
144 {
145     int level, dc, diff, i, j, run;
146     int component;
147     RLTable *rl                  = &ff_rl_mpeg1;
148     uint8_t *const scantable     = s->intra_scantable.permutated;
149     const uint16_t *quant_matrix = s->intra_matrix;
150     const int qscale             = s->qscale;
151
152     /* DC coefficient */
153     component = (n <= 3 ? 0 : n - 4 + 1);
154     diff = decode_dc(&s->gb, component);
155     if (diff >= 0xffff)
156         return AVERROR_INVALIDDATA;
157     dc  = s->last_dc[component];
158     dc += diff;
159     s->last_dc[component] = dc;
160     block[0] = dc * quant_matrix[0];
161     ff_tlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
162     i = 0;
163     {
164         OPEN_READER(re, &s->gb);
165         UPDATE_CACHE(re, &s->gb);
166         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
167             goto end;
168
169         /* now quantify & encode AC coefficients */
170         for (;;) {
171             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
172                        TEX_VLC_BITS, 2, 0);
173
174             if (level != 0) {
175                 i += run;
176                 check_scantable_index(s, i);
177                 j = scantable[i];
178                 level = (level * qscale * quant_matrix[j]) >> 4;
179                 level = (level - 1) | 1;
180                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
181                         SHOW_SBITS(re, &s->gb, 1);
182                 SKIP_BITS(re, &s->gb, 1);
183             } else {
184                 /* escape */
185                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
186                 LAST_SKIP_BITS(re, &s->gb, 6);
187                 UPDATE_CACHE(re, &s->gb);
188                 level = SHOW_SBITS(re, &s->gb, 8);
189                 SKIP_BITS(re, &s->gb, 8);
190                 if (level == -128) {
191                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
192                     SKIP_BITS(re, &s->gb, 8);
193                 } else if (level == 0) {
194                     level = SHOW_UBITS(re, &s->gb, 8);
195                     SKIP_BITS(re, &s->gb, 8);
196                 }
197                 i += run;
198                 check_scantable_index(s, i);
199                 j = scantable[i];
200                 if (level < 0) {
201                     level = -level;
202                     level = (level * qscale * quant_matrix[j]) >> 4;
203                     level = (level - 1) | 1;
204                     level = -level;
205                 } else {
206                     level = (level * qscale * quant_matrix[j]) >> 4;
207                     level = (level - 1) | 1;
208                 }
209             }
210
211             block[j] = level;
212             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
213                break;
214
215             UPDATE_CACHE(re, &s->gb);
216         }
217 end:
218         LAST_SKIP_BITS(re, &s->gb, 2);
219         CLOSE_READER(re, &s->gb);
220     }
221     s->block_last_index[n] = i;
222     return 0;
223 }
224
225 int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
226 {
227     return mpeg1_decode_block_intra(s, block, n);
228 }
229
230 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
231                                            int16_t *block, int n)
232 {
233     int level, i, j, run;
234     RLTable *rl                  = &ff_rl_mpeg1;
235     uint8_t *const scantable     = s->intra_scantable.permutated;
236     const uint16_t *quant_matrix = s->inter_matrix;
237     const int qscale             = s->qscale;
238
239     {
240         OPEN_READER(re, &s->gb);
241         i = -1;
242         // special case for first coefficient, no need to add second VLC table
243         UPDATE_CACHE(re, &s->gb);
244         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
245             level = (3 * qscale * quant_matrix[0]) >> 5;
246             level = (level - 1) | 1;
247             if (GET_CACHE(re, &s->gb) & 0x40000000)
248                 level = -level;
249             block[0] = level;
250             i++;
251             SKIP_BITS(re, &s->gb, 2);
252             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
253                 goto end;
254         }
255         /* now quantify & encode AC coefficients */
256         for (;;) {
257             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
258                        TEX_VLC_BITS, 2, 0);
259
260             if (level != 0) {
261                 i += run;
262                 check_scantable_index(s, i);
263                 j = scantable[i];
264                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
265                 level = (level - 1) | 1;
266                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
267                         SHOW_SBITS(re, &s->gb, 1);
268                 SKIP_BITS(re, &s->gb, 1);
269             } else {
270                 /* escape */
271                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
272                 LAST_SKIP_BITS(re, &s->gb, 6);
273                 UPDATE_CACHE(re, &s->gb);
274                 level = SHOW_SBITS(re, &s->gb, 8);
275                 SKIP_BITS(re, &s->gb, 8);
276                 if (level == -128) {
277                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
278                     SKIP_BITS(re, &s->gb, 8);
279                 } else if (level == 0) {
280                     level = SHOW_UBITS(re, &s->gb, 8);
281                     SKIP_BITS(re, &s->gb, 8);
282                 }
283                 i += run;
284                 check_scantable_index(s, i);
285                 j = scantable[i];
286                 if (level < 0) {
287                     level = -level;
288                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
289                     level = (level - 1) | 1;
290                     level = -level;
291                 } else {
292                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
293                     level = (level - 1) | 1;
294                 }
295             }
296
297             block[j] = level;
298             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
299                 break;
300             UPDATE_CACHE(re, &s->gb);
301         }
302 end:
303         LAST_SKIP_BITS(re, &s->gb, 2);
304         CLOSE_READER(re, &s->gb);
305     }
306     s->block_last_index[n] = i;
307     return 0;
308 }
309
310 /**
311  * Note: this function can read out of range and crash for corrupt streams.
312  * Changing this would eat up any speed benefits it has.
313  * Do not use "fast" flag if you need the code to be robust.
314  */
315 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
316                                                 int16_t *block, int n)
317 {
318     int level, i, j, run;
319     RLTable *rl              = &ff_rl_mpeg1;
320     uint8_t *const scantable = s->intra_scantable.permutated;
321     const int qscale         = s->qscale;
322
323     {
324         OPEN_READER(re, &s->gb);
325         i = -1;
326         // Special case for first coefficient, no need to add second VLC table.
327         UPDATE_CACHE(re, &s->gb);
328         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
329             level = (3 * qscale) >> 1;
330             level = (level - 1) | 1;
331             if (GET_CACHE(re, &s->gb) & 0x40000000)
332                 level = -level;
333             block[0] = level;
334             i++;
335             SKIP_BITS(re, &s->gb, 2);
336             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
337                 goto end;
338         }
339
340         /* now quantify & encode AC coefficients */
341         for (;;) {
342             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
343                        TEX_VLC_BITS, 2, 0);
344
345             if (level != 0) {
346                 i += run;
347                 check_scantable_index(s, i);
348                 j = scantable[i];
349                 level = ((level * 2 + 1) * qscale) >> 1;
350                 level = (level - 1) | 1;
351                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
352                         SHOW_SBITS(re, &s->gb, 1);
353                 SKIP_BITS(re, &s->gb, 1);
354             } else {
355                 /* escape */
356                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
357                 LAST_SKIP_BITS(re, &s->gb, 6);
358                 UPDATE_CACHE(re, &s->gb);
359                 level = SHOW_SBITS(re, &s->gb, 8);
360                 SKIP_BITS(re, &s->gb, 8);
361                 if (level == -128) {
362                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
363                     SKIP_BITS(re, &s->gb, 8);
364                 } else if (level == 0) {
365                     level = SHOW_UBITS(re, &s->gb, 8);
366                     SKIP_BITS(re, &s->gb, 8);
367                 }
368                 i += run;
369                 check_scantable_index(s, i);
370                 j = scantable[i];
371                 if (level < 0) {
372                     level = -level;
373                     level = ((level * 2 + 1) * qscale) >> 1;
374                     level = (level - 1) | 1;
375                     level = -level;
376                 } else {
377                     level = ((level * 2 + 1) * qscale) >> 1;
378                     level = (level - 1) | 1;
379                 }
380             }
381
382             block[j] = level;
383             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
384                 break;
385             UPDATE_CACHE(re, &s->gb);
386         }
387 end:
388         LAST_SKIP_BITS(re, &s->gb, 2);
389         CLOSE_READER(re, &s->gb);
390     }
391     s->block_last_index[n] = i;
392     return 0;
393 }
394
395 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
396                                                int16_t *block, int n)
397 {
398     int level, i, j, run;
399     RLTable *rl = &ff_rl_mpeg1;
400     uint8_t *const scantable = s->intra_scantable.permutated;
401     const uint16_t *quant_matrix;
402     const int qscale = s->qscale;
403     int mismatch;
404
405     mismatch = 1;
406
407     {
408         OPEN_READER(re, &s->gb);
409         i = -1;
410         if (n < 4)
411             quant_matrix = s->inter_matrix;
412         else
413             quant_matrix = s->chroma_inter_matrix;
414
415         // Special case for first coefficient, no need to add second VLC table.
416         UPDATE_CACHE(re, &s->gb);
417         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
418             level = (3 * qscale * quant_matrix[0]) >> 5;
419             if (GET_CACHE(re, &s->gb) & 0x40000000)
420                 level = -level;
421             block[0]  = level;
422             mismatch ^= level;
423             i++;
424             SKIP_BITS(re, &s->gb, 2);
425             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
426                 goto end;
427         }
428
429         /* now quantify & encode AC coefficients */
430         for (;;) {
431             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
432                        TEX_VLC_BITS, 2, 0);
433
434             if (level != 0) {
435                 i += run;
436                 check_scantable_index(s, i);
437                 j = scantable[i];
438                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
439                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
440                         SHOW_SBITS(re, &s->gb, 1);
441                 SKIP_BITS(re, &s->gb, 1);
442             } else {
443                 /* escape */
444                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
445                 LAST_SKIP_BITS(re, &s->gb, 6);
446                 UPDATE_CACHE(re, &s->gb);
447                 level = SHOW_SBITS(re, &s->gb, 12);
448                 SKIP_BITS(re, &s->gb, 12);
449
450                 i += run;
451                 check_scantable_index(s, i);
452                 j = scantable[i];
453                 if (level < 0) {
454                     level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
455                     level = -level;
456                 } else {
457                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
458                 }
459             }
460
461             mismatch ^= level;
462             block[j]  = level;
463             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
464                 break;
465             UPDATE_CACHE(re, &s->gb);
466         }
467 end:
468         LAST_SKIP_BITS(re, &s->gb, 2);
469         CLOSE_READER(re, &s->gb);
470     }
471     block[63] ^= (mismatch & 1);
472
473     s->block_last_index[n] = i;
474     return 0;
475 }
476
477 /**
478  * Note: this function can read out of range and crash for corrupt streams.
479  * Changing this would eat up any speed benefits it has.
480  * Do not use "fast" flag if you need the code to be robust.
481  */
482 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
483                                                     int16_t *block, int n)
484 {
485     int level, i, j, run;
486     RLTable *rl              = &ff_rl_mpeg1;
487     uint8_t *const scantable = s->intra_scantable.permutated;
488     const int qscale         = s->qscale;
489     OPEN_READER(re, &s->gb);
490     i = -1;
491
492     // special case for first coefficient, no need to add second VLC table
493     UPDATE_CACHE(re, &s->gb);
494     if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
495         level = (3 * qscale) >> 1;
496         if (GET_CACHE(re, &s->gb) & 0x40000000)
497             level = -level;
498         block[0] = level;
499         i++;
500         SKIP_BITS(re, &s->gb, 2);
501         if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
502             goto end;
503     }
504
505     /* now quantify & encode AC coefficients */
506     for (;;) {
507         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
508
509         if (level != 0) {
510             i += run;
511             j = scantable[i];
512             level = ((level * 2 + 1) * qscale) >> 1;
513             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
514                     SHOW_SBITS(re, &s->gb, 1);
515             SKIP_BITS(re, &s->gb, 1);
516         } else {
517             /* escape */
518             run = SHOW_UBITS(re, &s->gb, 6) + 1;
519             LAST_SKIP_BITS(re, &s->gb, 6);
520             UPDATE_CACHE(re, &s->gb);
521             level = SHOW_SBITS(re, &s->gb, 12);
522             SKIP_BITS(re, &s->gb, 12);
523
524             i += run;
525             j = scantable[i];
526             if (level < 0) {
527                 level = ((-level * 2 + 1) * qscale) >> 1;
528                 level = -level;
529             } else {
530                 level = ((level * 2 + 1) * qscale) >> 1;
531             }
532         }
533
534         block[j] = level;
535         if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
536             break;
537
538         UPDATE_CACHE(re, &s->gb);
539     }
540 end:
541     LAST_SKIP_BITS(re, &s->gb, 2);
542     CLOSE_READER(re, &s->gb);
543     s->block_last_index[n] = i;
544     return 0;
545 }
546
547 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
548                                            int16_t *block, int n)
549 {
550     int level, dc, diff, i, j, run;
551     int component;
552     RLTable *rl;
553     uint8_t *const scantable = s->intra_scantable.permutated;
554     const uint16_t *quant_matrix;
555     const int qscale = s->qscale;
556     int mismatch;
557
558     /* DC coefficient */
559     if (n < 4) {
560         quant_matrix = s->intra_matrix;
561         component    = 0;
562     } else {
563         quant_matrix = s->chroma_intra_matrix;
564         component    = (n & 1) + 1;
565     }
566     diff = decode_dc(&s->gb, component);
567     if (diff >= 0xffff)
568         return AVERROR_INVALIDDATA;
569     dc  = s->last_dc[component];
570     dc += diff;
571     s->last_dc[component] = dc;
572     block[0] = dc << (3 - s->intra_dc_precision);
573     ff_tlog(s->avctx, "dc=%d\n", block[0]);
574     mismatch = block[0] ^ 1;
575     i = 0;
576     if (s->intra_vlc_format)
577         rl = &ff_rl_mpeg2;
578     else
579         rl = &ff_rl_mpeg1;
580
581     {
582         OPEN_READER(re, &s->gb);
583         /* now quantify & encode AC coefficients */
584         for (;;) {
585             UPDATE_CACHE(re, &s->gb);
586             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
587                        TEX_VLC_BITS, 2, 0);
588
589             if (level == 127) {
590                 break;
591             } else if (level != 0) {
592                 i += run;
593                 check_scantable_index(s, i);
594                 j = scantable[i];
595                 level = (level * qscale * quant_matrix[j]) >> 4;
596                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
597                         SHOW_SBITS(re, &s->gb, 1);
598                 LAST_SKIP_BITS(re, &s->gb, 1);
599             } else {
600                 /* escape */
601                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
602                 LAST_SKIP_BITS(re, &s->gb, 6);
603                 UPDATE_CACHE(re, &s->gb);
604                 level = SHOW_SBITS(re, &s->gb, 12);
605                 SKIP_BITS(re, &s->gb, 12);
606                 i += run;
607                 check_scantable_index(s, i);
608                 j = scantable[i];
609                 if (level < 0) {
610                     level = (-level * qscale * quant_matrix[j]) >> 4;
611                     level = -level;
612                 } else {
613                     level = (level * qscale * quant_matrix[j]) >> 4;
614                 }
615             }
616
617             mismatch ^= level;
618             block[j]  = level;
619         }
620         CLOSE_READER(re, &s->gb);
621     }
622     block[63] ^= mismatch & 1;
623
624     s->block_last_index[n] = i;
625     return 0;
626 }
627
628 /**
629  * Note: this function can read out of range and crash for corrupt streams.
630  * Changing this would eat up any speed benefits it has.
631  * Do not use "fast" flag if you need the code to be robust.
632  */
633 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
634                                                 int16_t *block, int n)
635 {
636     int level, dc, diff, i, j, run;
637     int component;
638     RLTable *rl;
639     uint8_t *const scantable = s->intra_scantable.permutated;
640     const uint16_t *quant_matrix;
641     const int qscale = s->qscale;
642
643     /* DC coefficient */
644     if (n < 4) {
645         quant_matrix = s->intra_matrix;
646         component    = 0;
647     } else {
648         quant_matrix = s->chroma_intra_matrix;
649         component    = (n & 1) + 1;
650     }
651     diff = decode_dc(&s->gb, component);
652     if (diff >= 0xffff)
653         return AVERROR_INVALIDDATA;
654     dc = s->last_dc[component];
655     dc += diff;
656     s->last_dc[component] = dc;
657     block[0] = dc << (3 - s->intra_dc_precision);
658     i = 0;
659     if (s->intra_vlc_format)
660         rl = &ff_rl_mpeg2;
661     else
662         rl = &ff_rl_mpeg1;
663
664     {
665         OPEN_READER(re, &s->gb);
666         /* now quantify & encode AC coefficients */
667         for (;;) {
668             UPDATE_CACHE(re, &s->gb);
669             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
670                        TEX_VLC_BITS, 2, 0);
671
672             if (level >= 64 || i > 63) {
673                 break;
674             } else if (level != 0) {
675                 i += run;
676                 j = scantable[i];
677                 level = (level * qscale * quant_matrix[j]) >> 4;
678                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
679                         SHOW_SBITS(re, &s->gb, 1);
680                 LAST_SKIP_BITS(re, &s->gb, 1);
681             } else {
682                 /* escape */
683                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
684                 LAST_SKIP_BITS(re, &s->gb, 6);
685                 UPDATE_CACHE(re, &s->gb);
686                 level = SHOW_SBITS(re, &s->gb, 12);
687                 SKIP_BITS(re, &s->gb, 12);
688                 i += run;
689                 j = scantable[i];
690                 if (level < 0) {
691                     level = (-level * qscale * quant_matrix[j]) >> 4;
692                     level = -level;
693                 } else {
694                     level = (level * qscale * quant_matrix[j]) >> 4;
695                 }
696             }
697
698             block[j] = level;
699         }
700         CLOSE_READER(re, &s->gb);
701     }
702
703     s->block_last_index[n] = i;
704     return 0;
705 }
706
707 /******************************************/
708 /* decoding */
709
710 static inline int get_dmv(MpegEncContext *s)
711 {
712     if (get_bits1(&s->gb))
713         return 1 - (get_bits1(&s->gb) << 1);
714     else
715         return 0;
716 }
717
718 static inline int get_qscale(MpegEncContext *s)
719 {
720     int qscale = get_bits(&s->gb, 5);
721     if (s->q_scale_type)
722         return non_linear_qscale[qscale];
723     else
724         return qscale << 1;
725 }
726
727
728 /* motion type (for MPEG-2) */
729 #define MT_FIELD 1
730 #define MT_FRAME 2
731 #define MT_16X8  2
732 #define MT_DMV   3
733
734 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
735 {
736     int i, j, k, cbp, val, mb_type, motion_type;
737     const int mb_block_count = 4 + (1 << s->chroma_format);
738     int ret;
739
740     ff_tlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
741
742     av_assert2(s->mb_skipped == 0);
743
744     if (s->mb_skip_run-- != 0) {
745         if (s->pict_type == AV_PICTURE_TYPE_P) {
746             s->mb_skipped = 1;
747             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
748                 MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
749         } else {
750             int mb_type;
751
752             if (s->mb_x)
753                 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
754             else
755                 // FIXME not sure if this is allowed in MPEG at all
756                 mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
757             if (IS_INTRA(mb_type)) {
758                 av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
759                 return AVERROR_INVALIDDATA;
760             }
761             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
762                 mb_type | MB_TYPE_SKIP;
763
764             if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
765                 s->mb_skipped = 1;
766         }
767
768         return 0;
769     }
770
771     switch (s->pict_type) {
772     default:
773     case AV_PICTURE_TYPE_I:
774         if (get_bits1(&s->gb) == 0) {
775             if (get_bits1(&s->gb) == 0) {
776                 av_log(s->avctx, AV_LOG_ERROR,
777                        "invalid mb type in I Frame at %d %d\n",
778                        s->mb_x, s->mb_y);
779                 return AVERROR_INVALIDDATA;
780             }
781             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
782         } else {
783             mb_type = MB_TYPE_INTRA;
784         }
785         break;
786     case AV_PICTURE_TYPE_P:
787         mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
788         if (mb_type < 0) {
789             av_log(s->avctx, AV_LOG_ERROR,
790                    "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
791             return AVERROR_INVALIDDATA;
792         }
793         mb_type = ptype2mb_type[mb_type];
794         break;
795     case AV_PICTURE_TYPE_B:
796         mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
797         if (mb_type < 0) {
798             av_log(s->avctx, AV_LOG_ERROR,
799                    "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
800             return AVERROR_INVALIDDATA;
801         }
802         mb_type = btype2mb_type[mb_type];
803         break;
804     }
805     ff_tlog(s->avctx, "mb_type=%x\n", mb_type);
806 //    motion_type = 0; /* avoid warning */
807     if (IS_INTRA(mb_type)) {
808         s->bdsp.clear_blocks(s->block[0]);
809
810         if (!s->chroma_y_shift)
811             s->bdsp.clear_blocks(s->block[6]);
812
813         /* compute DCT type */
814         // FIXME: add an interlaced_dct coded var?
815         if (s->picture_structure == PICT_FRAME &&
816             !s->frame_pred_frame_dct)
817             s->interlaced_dct = get_bits1(&s->gb);
818
819         if (IS_QUANT(mb_type))
820             s->qscale = get_qscale(s);
821
822         if (s->concealment_motion_vectors) {
823             /* just parse them */
824             if (s->picture_structure != PICT_FRAME)
825                 skip_bits1(&s->gb);  /* field select */
826
827             s->mv[0][0][0]      =
828             s->last_mv[0][0][0] =
829             s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
830                                                      s->last_mv[0][0][0]);
831             s->mv[0][0][1]      =
832             s->last_mv[0][0][1] =
833             s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
834                                                      s->last_mv[0][0][1]);
835
836             check_marker(&s->gb, "after concealment_motion_vectors");
837         } else {
838             /* reset mv prediction */
839             memset(s->last_mv, 0, sizeof(s->last_mv));
840         }
841         s->mb_intra = 1;
842         // if 1, we memcpy blocks in xvmcvideo
843         if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
844             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
845
846         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
847             if (s->avctx->flags2 & CODEC_FLAG2_FAST) {
848                 for (i = 0; i < 6; i++)
849                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
850             } else {
851                 for (i = 0; i < mb_block_count; i++)
852                     if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
853                         return ret;
854             }
855         } else {
856             for (i = 0; i < 6; i++)
857                 if ((ret = mpeg1_decode_block_intra(s, *s->pblocks[i], i)) < 0)
858                     return ret;
859         }
860     } else {
861         if (mb_type & MB_TYPE_ZERO_MV) {
862             av_assert2(mb_type & MB_TYPE_CBP);
863
864             s->mv_dir = MV_DIR_FORWARD;
865             if (s->picture_structure == PICT_FRAME) {
866                 if (s->picture_structure == PICT_FRAME
867                     && !s->frame_pred_frame_dct)
868                     s->interlaced_dct = get_bits1(&s->gb);
869                 s->mv_type = MV_TYPE_16X16;
870             } else {
871                 s->mv_type            = MV_TYPE_FIELD;
872                 mb_type              |= MB_TYPE_INTERLACED;
873                 s->field_select[0][0] = s->picture_structure - 1;
874             }
875
876             if (IS_QUANT(mb_type))
877                 s->qscale = get_qscale(s);
878
879             s->last_mv[0][0][0] = 0;
880             s->last_mv[0][0][1] = 0;
881             s->last_mv[0][1][0] = 0;
882             s->last_mv[0][1][1] = 0;
883             s->mv[0][0][0]      = 0;
884             s->mv[0][0][1]      = 0;
885         } else {
886             av_assert2(mb_type & MB_TYPE_L0L1);
887             // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
888             /* get additional motion vector type */
889             if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
890                 motion_type = MT_FRAME;
891             } else {
892                 motion_type = get_bits(&s->gb, 2);
893                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
894                     s->interlaced_dct = get_bits1(&s->gb);
895             }
896
897             if (IS_QUANT(mb_type))
898                 s->qscale = get_qscale(s);
899
900             /* motion vectors */
901             s->mv_dir = (mb_type >> 13) & 3;
902             ff_tlog(s->avctx, "motion_type=%d\n", motion_type);
903             switch (motion_type) {
904             case MT_FRAME: /* or MT_16X8 */
905                 if (s->picture_structure == PICT_FRAME) {
906                     mb_type   |= MB_TYPE_16x16;
907                     s->mv_type = MV_TYPE_16X16;
908                     for (i = 0; i < 2; i++) {
909                         if (USES_LIST(mb_type, i)) {
910                             /* MT_FRAME */
911                             s->mv[i][0][0]      =
912                             s->last_mv[i][0][0] =
913                             s->last_mv[i][1][0] =
914                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0],
915                                                    s->last_mv[i][0][0]);
916                             s->mv[i][0][1]      =
917                             s->last_mv[i][0][1] =
918                             s->last_mv[i][1][1] =
919                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1],
920                                                    s->last_mv[i][0][1]);
921                             /* full_pel: only for MPEG-1 */
922                             if (s->full_pel[i]) {
923                                 s->mv[i][0][0] <<= 1;
924                                 s->mv[i][0][1] <<= 1;
925                             }
926                         }
927                     }
928                 } else {
929                     mb_type   |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
930                     s->mv_type = MV_TYPE_16X8;
931                     for (i = 0; i < 2; i++) {
932                         if (USES_LIST(mb_type, i)) {
933                             /* MT_16X8 */
934                             for (j = 0; j < 2; j++) {
935                                 s->field_select[i][j] = get_bits1(&s->gb);
936                                 for (k = 0; k < 2; k++) {
937                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
938                                                              s->last_mv[i][j][k]);
939                                     s->last_mv[i][j][k] = val;
940                                     s->mv[i][j][k]      = val;
941                                 }
942                             }
943                         }
944                     }
945                 }
946                 break;
947             case MT_FIELD:
948                 s->mv_type = MV_TYPE_FIELD;
949                 if (s->picture_structure == PICT_FRAME) {
950                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
951                     for (i = 0; i < 2; i++) {
952                         if (USES_LIST(mb_type, i)) {
953                             for (j = 0; j < 2; j++) {
954                                 s->field_select[i][j] = get_bits1(&s->gb);
955                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
956                                                          s->last_mv[i][j][0]);
957                                 s->last_mv[i][j][0] = val;
958                                 s->mv[i][j][0]      = val;
959                                 ff_tlog(s->avctx, "fmx=%d\n", val);
960                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
961                                                          s->last_mv[i][j][1] >> 1);
962                                 s->last_mv[i][j][1] = 2 * val;
963                                 s->mv[i][j][1]      = val;
964                                 ff_tlog(s->avctx, "fmy=%d\n", val);
965                             }
966                         }
967                     }
968                 } else {
969                     av_assert0(!s->progressive_sequence);
970                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
971                     for (i = 0; i < 2; i++) {
972                         if (USES_LIST(mb_type, i)) {
973                             s->field_select[i][0] = get_bits1(&s->gb);
974                             for (k = 0; k < 2; k++) {
975                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
976                                                          s->last_mv[i][0][k]);
977                                 s->last_mv[i][0][k] = val;
978                                 s->last_mv[i][1][k] = val;
979                                 s->mv[i][0][k]      = val;
980                             }
981                         }
982                     }
983                 }
984                 break;
985             case MT_DMV:
986                 if (s->progressive_sequence){
987                     av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
988                     return AVERROR_INVALIDDATA;
989                 }
990                 s->mv_type = MV_TYPE_DMV;
991                 for (i = 0; i < 2; i++) {
992                     if (USES_LIST(mb_type, i)) {
993                         int dmx, dmy, mx, my, m;
994                         const int my_shift = s->picture_structure == PICT_FRAME;
995
996                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
997                                                 s->last_mv[i][0][0]);
998                         s->last_mv[i][0][0] = mx;
999                         s->last_mv[i][1][0] = mx;
1000                         dmx = get_dmv(s);
1001                         my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1002                                                  s->last_mv[i][0][1] >> my_shift);
1003                         dmy = get_dmv(s);
1004
1005
1006                         s->last_mv[i][0][1] = my << my_shift;
1007                         s->last_mv[i][1][1] = my << my_shift;
1008
1009                         s->mv[i][0][0] = mx;
1010                         s->mv[i][0][1] = my;
1011                         s->mv[i][1][0] = mx; // not used
1012                         s->mv[i][1][1] = my; // not used
1013
1014                         if (s->picture_structure == PICT_FRAME) {
1015                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1016
1017                             // m = 1 + 2 * s->top_field_first;
1018                             m = s->top_field_first ? 1 : 3;
1019
1020                             /* top -> top pred */
1021                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1022                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1023                             m = 4 - m;
1024                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1025                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1026                         } else {
1027                             mb_type |= MB_TYPE_16x16;
1028
1029                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1030                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1031                             if (s->picture_structure == PICT_TOP_FIELD)
1032                                 s->mv[i][2][1]--;
1033                             else
1034                                 s->mv[i][2][1]++;
1035                         }
1036                     }
1037                 }
1038                 break;
1039             default:
1040                 av_log(s->avctx, AV_LOG_ERROR,
1041                        "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1042                 return AVERROR_INVALIDDATA;
1043             }
1044         }
1045
1046         s->mb_intra = 0;
1047         if (HAS_CBP(mb_type)) {
1048             s->bdsp.clear_blocks(s->block[0]);
1049
1050             cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1051             if (mb_block_count > 6) {
1052                 cbp <<= mb_block_count - 6;
1053                 cbp  |= get_bits(&s->gb, mb_block_count - 6);
1054                 s->bdsp.clear_blocks(s->block[6]);
1055             }
1056             if (cbp <= 0) {
1057                 av_log(s->avctx, AV_LOG_ERROR,
1058                        "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
1059                 return AVERROR_INVALIDDATA;
1060             }
1061
1062             // if 1, we memcpy blocks in xvmcvideo
1063             if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1064                 ff_xvmc_pack_pblocks(s, cbp);
1065
1066             if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1067                 if (s->avctx->flags2 & CODEC_FLAG2_FAST) {
1068                     for (i = 0; i < 6; i++) {
1069                         if (cbp & 32)
1070                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1071                         else
1072                             s->block_last_index[i] = -1;
1073                         cbp += cbp;
1074                     }
1075                 } else {
1076                     cbp <<= 12 - mb_block_count;
1077
1078                     for (i = 0; i < mb_block_count; i++) {
1079                         if (cbp & (1 << 11)) {
1080                             if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1081                                 return ret;
1082                         } else {
1083                             s->block_last_index[i] = -1;
1084                         }
1085                         cbp += cbp;
1086                     }
1087                 }
1088             } else {
1089                 if (s->avctx->flags2 & CODEC_FLAG2_FAST) {
1090                     for (i = 0; i < 6; i++) {
1091                         if (cbp & 32)
1092                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1093                         else
1094                             s->block_last_index[i] = -1;
1095                         cbp += cbp;
1096                     }
1097                 } else {
1098                     for (i = 0; i < 6; i++) {
1099                         if (cbp & 32) {
1100                             if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1101                                 return ret;
1102                         } else {
1103                             s->block_last_index[i] = -1;
1104                         }
1105                         cbp += cbp;
1106                     }
1107                 }
1108             }
1109         } else {
1110             for (i = 0; i < 12; i++)
1111                 s->block_last_index[i] = -1;
1112         }
1113     }
1114
1115     s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1116
1117     return 0;
1118 }
1119
1120 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1121 {
1122     Mpeg1Context *s    = avctx->priv_data;
1123     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1124
1125     ff_mpv_decode_defaults(s2);
1126
1127     if (   avctx->codec_tag != AV_RL32("VCR2")
1128         && avctx->codec_tag != AV_RL32("BW10"))
1129         avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1130     ff_mpv_decode_init(s2, avctx);
1131
1132     s->mpeg_enc_ctx.avctx  = avctx;
1133
1134     /* we need some permutation to store matrices,
1135      * until the decoder sets the real permutation. */
1136     ff_mpv_idct_init(s2);
1137     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1138     ff_mpeg12_init_vlcs();
1139
1140     s->mpeg_enc_ctx_allocated      = 0;
1141     s->mpeg_enc_ctx.picture_number = 0;
1142     s->repeat_field                = 0;
1143     s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1144     avctx->color_range             = AVCOL_RANGE_MPEG;
1145     return 0;
1146 }
1147
1148 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1149                                              const AVCodecContext *avctx_from)
1150 {
1151     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1152     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1153     int err;
1154
1155     if (avctx == avctx_from               ||
1156         !ctx_from->mpeg_enc_ctx_allocated ||
1157         !s1->context_initialized)
1158         return 0;
1159
1160     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1161     if (err)
1162         return err;
1163
1164     if (!ctx->mpeg_enc_ctx_allocated)
1165         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1166
1167     if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1168         s->picture_number++;
1169
1170     return 0;
1171 }
1172
1173 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1174                                  const uint8_t *new_perm)
1175 {
1176     uint16_t temp_matrix[64];
1177     int i;
1178
1179     memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1180
1181     for (i = 0; i < 64; i++)
1182         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1183 }
1184
1185 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1186 #if CONFIG_MPEG1_XVMC_HWACCEL
1187     AV_PIX_FMT_XVMC,
1188 #endif
1189 #if CONFIG_MPEG1_VDPAU_HWACCEL
1190     AV_PIX_FMT_VDPAU_MPEG1,
1191     AV_PIX_FMT_VDPAU,
1192 #endif
1193     AV_PIX_FMT_YUV420P,
1194     AV_PIX_FMT_NONE
1195 };
1196
1197 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1198 #if CONFIG_MPEG2_XVMC_HWACCEL
1199     AV_PIX_FMT_XVMC,
1200 #endif
1201 #if CONFIG_MPEG2_VDPAU_HWACCEL
1202     AV_PIX_FMT_VDPAU_MPEG2,
1203     AV_PIX_FMT_VDPAU,
1204 #endif
1205 #if CONFIG_MPEG2_DXVA2_HWACCEL
1206     AV_PIX_FMT_DXVA2_VLD,
1207 #endif
1208 #if CONFIG_MPEG2_D3D11VA_HWACCEL
1209     AV_PIX_FMT_D3D11VA_VLD,
1210 #endif
1211 #if CONFIG_MPEG2_VAAPI_HWACCEL
1212     AV_PIX_FMT_VAAPI_VLD,
1213 #endif
1214     AV_PIX_FMT_YUV420P,
1215     AV_PIX_FMT_NONE
1216 };
1217
1218 static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1219     AV_PIX_FMT_YUV422P,
1220     AV_PIX_FMT_NONE
1221 };
1222
1223 static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1224     AV_PIX_FMT_YUV444P,
1225     AV_PIX_FMT_NONE
1226 };
1227
1228 static inline int uses_vdpau(AVCodecContext *avctx) {
1229     return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1230 }
1231
1232 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1233 {
1234     Mpeg1Context *s1  = avctx->priv_data;
1235     MpegEncContext *s = &s1->mpeg_enc_ctx;
1236     const enum AVPixelFormat *pix_fmts;
1237
1238     if (CONFIG_GRAY && (avctx->flags & CODEC_FLAG_GRAY))
1239         return AV_PIX_FMT_GRAY8;
1240
1241     if (s->chroma_format < 2)
1242         pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1243                                 mpeg1_hwaccel_pixfmt_list_420 :
1244                                 mpeg2_hwaccel_pixfmt_list_420;
1245     else if (s->chroma_format == 2)
1246         pix_fmts = mpeg12_pixfmt_list_422;
1247     else
1248         pix_fmts = mpeg12_pixfmt_list_444;
1249
1250     return ff_thread_get_format(avctx, pix_fmts);
1251 }
1252
1253 static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1254 {
1255     // until then pix_fmt may be changed right after codec init
1256     if (avctx->hwaccel || uses_vdpau(avctx))
1257         if (avctx->idct_algo == FF_IDCT_AUTO)
1258             avctx->idct_algo = FF_IDCT_SIMPLE;
1259
1260     if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1261         Mpeg1Context *s1 = avctx->priv_data;
1262         MpegEncContext *s = &s1->mpeg_enc_ctx;
1263
1264         s->pack_pblocks = 1;
1265 #if FF_API_XVMC
1266         avctx->xvmc_acceleration = 2;
1267 #endif /* FF_API_XVMC */
1268     }
1269 }
1270
1271 /* Call this function when we know all parameters.
1272  * It may be called in different places for MPEG-1 and MPEG-2. */
1273 static int mpeg_decode_postinit(AVCodecContext *avctx)
1274 {
1275     Mpeg1Context *s1  = avctx->priv_data;
1276     MpegEncContext *s = &s1->mpeg_enc_ctx;
1277     uint8_t old_permutation[64];
1278     int ret;
1279
1280     if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1281         // MPEG-1 aspect
1282         avctx->sample_aspect_ratio = av_d2q(1.0 / ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1283     } else { // MPEG-2
1284         // MPEG-2 aspect
1285         if (s->aspect_ratio_info > 1) {
1286             AVRational dar =
1287                 av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1288                                   (AVRational) { s1->pan_scan.width,
1289                                                  s1->pan_scan.height }),
1290                          (AVRational) { s->width, s->height });
1291
1292             /* We ignore the spec here and guess a bit as reality does not
1293              * match the spec, see for example res_change_ffmpeg_aspect.ts
1294              * and sequence-display-aspect.mpg.
1295              * issue1613, 621, 562 */
1296             if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1297                 (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1298                  av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1299                 s->avctx->sample_aspect_ratio =
1300                     av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1301                              (AVRational) { s->width, s->height });
1302             } else {
1303                 s->avctx->sample_aspect_ratio =
1304                     av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1305                              (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1306 // issue1613 4/3 16/9 -> 16/9
1307 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1308 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1309 //                s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1310                 ff_dlog(avctx, "aspect A %d/%d\n",
1311                         ff_mpeg2_aspect[s->aspect_ratio_info].num,
1312                         ff_mpeg2_aspect[s->aspect_ratio_info].den);
1313                 ff_dlog(avctx, "aspect B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1314                         s->avctx->sample_aspect_ratio.den);
1315             }
1316         } else {
1317             s->avctx->sample_aspect_ratio =
1318                 ff_mpeg2_aspect[s->aspect_ratio_info];
1319         }
1320     } // MPEG-2
1321
1322     if (av_image_check_sar(s->width, s->height,
1323                            avctx->sample_aspect_ratio) < 0) {
1324         av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
1325                 avctx->sample_aspect_ratio.num,
1326                 avctx->sample_aspect_ratio.den);
1327         avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
1328     }
1329
1330     if ((s1->mpeg_enc_ctx_allocated == 0)                   ||
1331         avctx->coded_width       != s->width                ||
1332         avctx->coded_height      != s->height               ||
1333         s1->save_width           != s->width                ||
1334         s1->save_height          != s->height               ||
1335         av_cmp_q(s1->save_aspect, s->avctx->sample_aspect_ratio) ||
1336         (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1337         0) {
1338         if (s1->mpeg_enc_ctx_allocated) {
1339             ParseContext pc = s->parse_context;
1340             s->parse_context.buffer = 0;
1341             ff_mpv_common_end(s);
1342             s->parse_context = pc;
1343             s1->mpeg_enc_ctx_allocated = 0;
1344         }
1345
1346         ret = ff_set_dimensions(avctx, s->width, s->height);
1347         if (ret < 0)
1348             return ret;
1349
1350         if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1351             avctx->rc_max_rate = s->bit_rate;
1352         } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1353                    (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1354             avctx->bit_rate = s->bit_rate;
1355         }
1356         s1->save_aspect          = s->avctx->sample_aspect_ratio;
1357         s1->save_width           = s->width;
1358         s1->save_height          = s->height;
1359         s1->save_progressive_seq = s->progressive_sequence;
1360
1361         /* low_delay may be forced, in this case we will have B-frames
1362          * that behave like P-frames. */
1363         avctx->has_b_frames = !s->low_delay;
1364
1365         if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1366             // MPEG-1 fps
1367             avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1368             avctx->ticks_per_frame     = 1;
1369
1370             avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1371         } else { // MPEG-2
1372             // MPEG-2 fps
1373             av_reduce(&s->avctx->framerate.num,
1374                       &s->avctx->framerate.den,
1375                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1376                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1377                       1 << 30);
1378             avctx->ticks_per_frame = 2;
1379
1380             switch (s->chroma_format) {
1381             case 1: avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; break;
1382             case 2:
1383             case 3: avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT; break;
1384             }
1385         } // MPEG-2
1386
1387         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1388         setup_hwaccel_for_pixfmt(avctx);
1389
1390         /* Quantization matrices may need reordering
1391          * if DCT permutation is changed. */
1392         memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1393
1394         ff_mpv_idct_init(s);
1395         if ((ret = ff_mpv_common_init(s)) < 0)
1396             return ret;
1397
1398         quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->idsp.idct_permutation);
1399         quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->idsp.idct_permutation);
1400         quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1401         quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1402
1403         s1->mpeg_enc_ctx_allocated = 1;
1404     }
1405     return 0;
1406 }
1407
1408 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1409                                 int buf_size)
1410 {
1411     Mpeg1Context *s1  = avctx->priv_data;
1412     MpegEncContext *s = &s1->mpeg_enc_ctx;
1413     int ref, f_code, vbv_delay;
1414
1415     init_get_bits(&s->gb, buf, buf_size * 8);
1416
1417     ref = get_bits(&s->gb, 10); /* temporal ref */
1418     s->pict_type = get_bits(&s->gb, 3);
1419     if (s->pict_type == 0 || s->pict_type > 3)
1420         return AVERROR_INVALIDDATA;
1421
1422     vbv_delay = get_bits(&s->gb, 16);
1423     s->vbv_delay = vbv_delay;
1424     if (s->pict_type == AV_PICTURE_TYPE_P ||
1425         s->pict_type == AV_PICTURE_TYPE_B) {
1426         s->full_pel[0] = get_bits1(&s->gb);
1427         f_code = get_bits(&s->gb, 3);
1428         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1429             return AVERROR_INVALIDDATA;
1430         f_code += !f_code;
1431         s->mpeg_f_code[0][0] = f_code;
1432         s->mpeg_f_code[0][1] = f_code;
1433     }
1434     if (s->pict_type == AV_PICTURE_TYPE_B) {
1435         s->full_pel[1] = get_bits1(&s->gb);
1436         f_code = get_bits(&s->gb, 3);
1437         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1438             return AVERROR_INVALIDDATA;
1439         f_code += !f_code;
1440         s->mpeg_f_code[1][0] = f_code;
1441         s->mpeg_f_code[1][1] = f_code;
1442     }
1443     s->current_picture.f->pict_type = s->pict_type;
1444     s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1445
1446     if (avctx->debug & FF_DEBUG_PICT_INFO)
1447         av_log(avctx, AV_LOG_DEBUG,
1448                "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1449
1450     s->y_dc_scale = 8;
1451     s->c_dc_scale = 8;
1452     return 0;
1453 }
1454
1455 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1456 {
1457     MpegEncContext *s = &s1->mpeg_enc_ctx;
1458     int horiz_size_ext, vert_size_ext;
1459     int bit_rate_ext;
1460
1461     skip_bits(&s->gb, 1); /* profile and level esc*/
1462     s->avctx->profile       = get_bits(&s->gb, 3);
1463     s->avctx->level         = get_bits(&s->gb, 4);
1464     s->progressive_sequence = get_bits1(&s->gb);   /* progressive_sequence */
1465     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1466     horiz_size_ext          = get_bits(&s->gb, 2);
1467     vert_size_ext           = get_bits(&s->gb, 2);
1468     s->width  |= (horiz_size_ext << 12);
1469     s->height |= (vert_size_ext  << 12);
1470     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1471     s->bit_rate += (bit_rate_ext << 18) * 400;
1472     check_marker(&s->gb, "after bit rate extension");
1473     s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1474
1475     s->low_delay = get_bits1(&s->gb);
1476     if (s->avctx->flags & CODEC_FLAG_LOW_DELAY)
1477         s->low_delay = 1;
1478
1479     s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1480     s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1481
1482     ff_dlog(s->avctx, "sequence extension\n");
1483     s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1484
1485     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1486         av_log(s->avctx, AV_LOG_DEBUG,
1487                "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%d\n",
1488                s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1489                s->avctx->rc_buffer_size, s->bit_rate);
1490 }
1491
1492 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1493 {
1494     MpegEncContext *s = &s1->mpeg_enc_ctx;
1495     int color_description, w, h;
1496
1497     skip_bits(&s->gb, 3); /* video format */
1498     color_description = get_bits1(&s->gb);
1499     if (color_description) {
1500         s->avctx->color_primaries = get_bits(&s->gb, 8);
1501         s->avctx->color_trc       = get_bits(&s->gb, 8);
1502         s->avctx->colorspace      = get_bits(&s->gb, 8);
1503     }
1504     w = get_bits(&s->gb, 14);
1505     skip_bits(&s->gb, 1); // marker
1506     h = get_bits(&s->gb, 14);
1507     // remaining 3 bits are zero padding
1508
1509     s1->pan_scan.width  = 16 * w;
1510     s1->pan_scan.height = 16 * h;
1511
1512     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1513         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1514 }
1515
1516 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1517 {
1518     MpegEncContext *s = &s1->mpeg_enc_ctx;
1519     int i, nofco;
1520
1521     nofco = 1;
1522     if (s->progressive_sequence) {
1523         if (s->repeat_first_field) {
1524             nofco++;
1525             if (s->top_field_first)
1526                 nofco++;
1527         }
1528     } else {
1529         if (s->picture_structure == PICT_FRAME) {
1530             nofco++;
1531             if (s->repeat_first_field)
1532                 nofco++;
1533         }
1534     }
1535     for (i = 0; i < nofco; i++) {
1536         s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1537         skip_bits(&s->gb, 1); // marker
1538         s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1539         skip_bits(&s->gb, 1); // marker
1540     }
1541
1542     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1543         av_log(s->avctx, AV_LOG_DEBUG,
1544                "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1545                s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1546                s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1547                s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1548 }
1549
1550 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1551                        uint16_t matrix1[64], int intra)
1552 {
1553     int i;
1554
1555     for (i = 0; i < 64; i++) {
1556         int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1557         int v = get_bits(&s->gb, 8);
1558         if (v == 0) {
1559             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1560             return AVERROR_INVALIDDATA;
1561         }
1562         if (intra && i == 0 && v != 8) {
1563             av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1564             v = 8; // needed by pink.mpg / issue1046
1565         }
1566         matrix0[j] = v;
1567         if (matrix1)
1568             matrix1[j] = v;
1569     }
1570     return 0;
1571 }
1572
1573 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1574 {
1575     ff_dlog(s->avctx, "matrix extension\n");
1576
1577     if (get_bits1(&s->gb))
1578         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1579     if (get_bits1(&s->gb))
1580         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1581     if (get_bits1(&s->gb))
1582         load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1583     if (get_bits1(&s->gb))
1584         load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1585 }
1586
1587 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1588 {
1589     MpegEncContext *s = &s1->mpeg_enc_ctx;
1590
1591     s->full_pel[0]       = s->full_pel[1] = 0;
1592     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1593     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1594     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1595     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1596     if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1597         av_log(s->avctx, AV_LOG_ERROR,
1598                "Missing picture start code, guessing missing values\n");
1599         if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1600             if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1601                 s->pict_type = AV_PICTURE_TYPE_I;
1602             else
1603                 s->pict_type = AV_PICTURE_TYPE_P;
1604         } else
1605             s->pict_type = AV_PICTURE_TYPE_B;
1606         s->current_picture.f->pict_type = s->pict_type;
1607         s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1608     }
1609     s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1610     s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1611     s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1612     s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1613
1614     s->intra_dc_precision         = get_bits(&s->gb, 2);
1615     s->picture_structure          = get_bits(&s->gb, 2);
1616     s->top_field_first            = get_bits1(&s->gb);
1617     s->frame_pred_frame_dct       = get_bits1(&s->gb);
1618     s->concealment_motion_vectors = get_bits1(&s->gb);
1619     s->q_scale_type               = get_bits1(&s->gb);
1620     s->intra_vlc_format           = get_bits1(&s->gb);
1621     s->alternate_scan             = get_bits1(&s->gb);
1622     s->repeat_first_field         = get_bits1(&s->gb);
1623     s->chroma_420_type            = get_bits1(&s->gb);
1624     s->progressive_frame          = get_bits1(&s->gb);
1625
1626     if (s->alternate_scan) {
1627         ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1628         ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1629     } else {
1630         ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1631         ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1632     }
1633
1634     /* composite display not parsed */
1635     ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1636     ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1637     ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1638     ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1639     ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1640     ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1641     ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1642     ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1643     ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1644 }
1645
1646 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1647 {
1648     AVCodecContext *avctx = s->avctx;
1649     Mpeg1Context *s1      = (Mpeg1Context *) s;
1650     int ret;
1651
1652     /* start frame decoding */
1653     if (s->first_field || s->picture_structure == PICT_FRAME) {
1654         AVFrameSideData *pan_scan;
1655
1656         if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1657             return ret;
1658
1659         ff_mpeg_er_frame_start(s);
1660
1661         /* first check if we must repeat the frame */
1662         s->current_picture_ptr->f->repeat_pict = 0;
1663         if (s->repeat_first_field) {
1664             if (s->progressive_sequence) {
1665                 if (s->top_field_first)
1666                     s->current_picture_ptr->f->repeat_pict = 4;
1667                 else
1668                     s->current_picture_ptr->f->repeat_pict = 2;
1669             } else if (s->progressive_frame) {
1670                 s->current_picture_ptr->f->repeat_pict = 1;
1671             }
1672         }
1673
1674         pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1675                                           AV_FRAME_DATA_PANSCAN,
1676                                           sizeof(s1->pan_scan));
1677         if (!pan_scan)
1678             return AVERROR(ENOMEM);
1679         memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1680
1681         if (s1->a53_caption) {
1682             AVFrameSideData *sd = av_frame_new_side_data(
1683                 s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1684                 s1->a53_caption_size);
1685             if (sd)
1686                 memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1687             av_freep(&s1->a53_caption);
1688         }
1689
1690         if (s1->has_stereo3d) {
1691             AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1692             if (!stereo)
1693                 return AVERROR(ENOMEM);
1694
1695             *stereo = s1->stereo3d;
1696             s1->has_stereo3d = 0;
1697         }
1698
1699         if (s1->has_afd) {
1700             AVFrameSideData *sd =
1701                 av_frame_new_side_data(s->current_picture_ptr->f,
1702                                        AV_FRAME_DATA_AFD, 1);
1703             if (!sd)
1704                 return AVERROR(ENOMEM);
1705
1706             *sd->data   = s1->afd;
1707             s1->has_afd = 0;
1708         }
1709
1710         if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1711             ff_thread_finish_setup(avctx);
1712     } else { // second field
1713         int i;
1714
1715         if (!s->current_picture_ptr) {
1716             av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1717             return AVERROR_INVALIDDATA;
1718         }
1719
1720         if (s->avctx->hwaccel &&
1721             (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1722             if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1723                 av_log(avctx, AV_LOG_ERROR,
1724                        "hardware accelerator failed to decode first field\n");
1725         }
1726
1727         for (i = 0; i < 4; i++) {
1728             s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1729             if (s->picture_structure == PICT_BOTTOM_FIELD)
1730                 s->current_picture.f->data[i] +=
1731                     s->current_picture_ptr->f->linesize[i];
1732         }
1733     }
1734
1735     if (avctx->hwaccel) {
1736         if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1737             return ret;
1738     }
1739
1740     return 0;
1741 }
1742
1743 #define DECODE_SLICE_ERROR -1
1744 #define DECODE_SLICE_OK     0
1745
1746 /**
1747  * Decode a slice.
1748  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1749  * @return DECODE_SLICE_ERROR if the slice is damaged,
1750  *         DECODE_SLICE_OK if this slice is OK
1751  */
1752 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1753                              const uint8_t **buf, int buf_size)
1754 {
1755     AVCodecContext *avctx = s->avctx;
1756     const int lowres      = s->avctx->lowres;
1757     const int field_pic   = s->picture_structure != PICT_FRAME;
1758     int ret;
1759
1760     s->resync_mb_x =
1761     s->resync_mb_y = -1;
1762
1763     av_assert0(mb_y < s->mb_height);
1764
1765     init_get_bits(&s->gb, *buf, buf_size * 8);
1766     if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1767         skip_bits(&s->gb, 3);
1768
1769     ff_mpeg1_clean_buffers(s);
1770     s->interlaced_dct = 0;
1771
1772     s->qscale = get_qscale(s);
1773
1774     if (s->qscale == 0) {
1775         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1776         return AVERROR_INVALIDDATA;
1777     }
1778
1779     /* extra slice info */
1780     if (skip_1stop_8data_bits(&s->gb) < 0)
1781         return AVERROR_INVALIDDATA;
1782
1783     s->mb_x = 0;
1784
1785     if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1786         skip_bits1(&s->gb);
1787     } else {
1788         while (get_bits_left(&s->gb) > 0) {
1789             int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1790                                 MBINCR_VLC_BITS, 2);
1791             if (code < 0) {
1792                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1793                 return AVERROR_INVALIDDATA;
1794             }
1795             if (code >= 33) {
1796                 if (code == 33)
1797                     s->mb_x += 33;
1798                 /* otherwise, stuffing, nothing to do */
1799             } else {
1800                 s->mb_x += code;
1801                 break;
1802             }
1803         }
1804     }
1805
1806     if (s->mb_x >= (unsigned) s->mb_width) {
1807         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1808         return AVERROR_INVALIDDATA;
1809     }
1810
1811     if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1812         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1813         int start_code = -1;
1814         buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1815         if (buf_end < *buf + buf_size)
1816             buf_end -= 4;
1817         s->mb_y = mb_y;
1818         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1819             return DECODE_SLICE_ERROR;
1820         *buf = buf_end;
1821         return DECODE_SLICE_OK;
1822     }
1823
1824     s->resync_mb_x = s->mb_x;
1825     s->resync_mb_y = s->mb_y = mb_y;
1826     s->mb_skip_run = 0;
1827     ff_init_block_index(s);
1828
1829     if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1830         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1831             av_log(s->avctx, AV_LOG_DEBUG,
1832                    "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",
1833                    s->qscale,
1834                    s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1835                    s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1836                    s->pict_type  == AV_PICTURE_TYPE_I ? "I" :
1837                    (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1838                    (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1839                    s->progressive_sequence ? "ps"  : "",
1840                    s->progressive_frame    ? "pf"  : "",
1841                    s->alternate_scan       ? "alt" : "",
1842                    s->top_field_first      ? "top" : "",
1843                    s->intra_dc_precision, s->picture_structure,
1844                    s->frame_pred_frame_dct, s->concealment_motion_vectors,
1845                    s->q_scale_type, s->intra_vlc_format,
1846                    s->repeat_first_field, s->chroma_420_type ? "420" : "");
1847         }
1848     }
1849
1850     for (;;) {
1851         // If 1, we memcpy blocks in xvmcvideo.
1852         if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1853             ff_xvmc_init_block(s); // set s->block
1854
1855         if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1856             return ret;
1857
1858         // Note motion_val is normally NULL unless we want to extract the MVs.
1859         if (s->current_picture.motion_val[0] && !s->encoding) {
1860             const int wrap = s->b8_stride;
1861             int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1862             int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1863             int motion_x, motion_y, dir, i;
1864
1865             for (i = 0; i < 2; i++) {
1866                 for (dir = 0; dir < 2; dir++) {
1867                     if (s->mb_intra ||
1868                         (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1869                         motion_x = motion_y = 0;
1870                     } else if (s->mv_type == MV_TYPE_16X16 ||
1871                                (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1872                         motion_x = s->mv[dir][0][0];
1873                         motion_y = s->mv[dir][0][1];
1874                     } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1875                         motion_x = s->mv[dir][i][0];
1876                         motion_y = s->mv[dir][i][1];
1877                     }
1878
1879                     s->current_picture.motion_val[dir][xy][0]     = motion_x;
1880                     s->current_picture.motion_val[dir][xy][1]     = motion_y;
1881                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1882                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1883                     s->current_picture.ref_index [dir][b8_xy]     =
1884                     s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1885                     av_assert2(s->field_select[dir][i] == 0 ||
1886                                s->field_select[dir][i] == 1);
1887                 }
1888                 xy    += wrap;
1889                 b8_xy += 2;
1890             }
1891         }
1892
1893         s->dest[0] += 16 >> lowres;
1894         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1895         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1896
1897         ff_mpv_decode_mb(s, s->block);
1898
1899         if (++s->mb_x >= s->mb_width) {
1900             const int mb_size = 16 >> s->avctx->lowres;
1901
1902             ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1903             ff_mpv_report_decode_progress(s);
1904
1905             s->mb_x  = 0;
1906             s->mb_y += 1 << field_pic;
1907
1908             if (s->mb_y >= s->mb_height) {
1909                 int left   = get_bits_left(&s->gb);
1910                 int is_d10 = s->chroma_format == 2 &&
1911                              s->pict_type == AV_PICTURE_TYPE_I &&
1912                              avctx->profile == 0 && avctx->level == 5 &&
1913                              s->intra_dc_precision == 2 &&
1914                              s->q_scale_type == 1 && s->alternate_scan == 0 &&
1915                              s->progressive_frame == 0
1916                              /* vbv_delay == 0xBBB || 0xE10 */;
1917
1918                 if (left >= 32 && !is_d10) {
1919                     GetBitContext gb = s->gb;
1920                     align_get_bits(&gb);
1921                     if (show_bits(&gb, 24) == 0x060E2B) {
1922                         av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1923                         is_d10 = 1;
1924                     }
1925                 }
1926
1927                 if (left < 0 ||
1928                     (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1929                     ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1930                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
1931                            left, show_bits(&s->gb, FFMIN(left, 23)));
1932                     return AVERROR_INVALIDDATA;
1933                 } else
1934                     goto eos;
1935             }
1936             // There are some files out there which are missing the last slice
1937             // in cases where the slice is completely outside the visible
1938             // area, we detect this here instead of running into the end expecting
1939             // more data
1940             if (s->mb_y >= ((s->height + 15) >> 4) &&
1941                 !s->progressive_sequence &&
1942                 get_bits_left(&s->gb) <= 8 &&
1943                 get_bits_left(&s->gb) >= 0 &&
1944                 s->mb_skip_run == -1 &&
1945                 show_bits(&s->gb, 8) == 0)
1946                 goto eos;
1947
1948             ff_init_block_index(s);
1949         }
1950
1951         /* skip mb handling */
1952         if (s->mb_skip_run == -1) {
1953             /* read increment again */
1954             s->mb_skip_run = 0;
1955             for (;;) {
1956                 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1957                                     MBINCR_VLC_BITS, 2);
1958                 if (code < 0) {
1959                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1960                     return AVERROR_INVALIDDATA;
1961                 }
1962                 if (code >= 33) {
1963                     if (code == 33) {
1964                         s->mb_skip_run += 33;
1965                     } else if (code == 35) {
1966                         if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1967                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1968                             return AVERROR_INVALIDDATA;
1969                         }
1970                         goto eos; /* end of slice */
1971                     }
1972                     /* otherwise, stuffing, nothing to do */
1973                 } else {
1974                     s->mb_skip_run += code;
1975                     break;
1976                 }
1977             }
1978             if (s->mb_skip_run) {
1979                 int i;
1980                 if (s->pict_type == AV_PICTURE_TYPE_I) {
1981                     av_log(s->avctx, AV_LOG_ERROR,
1982                            "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1983                     return AVERROR_INVALIDDATA;
1984                 }
1985
1986                 /* skip mb */
1987                 s->mb_intra = 0;
1988                 for (i = 0; i < 12; i++)
1989                     s->block_last_index[i] = -1;
1990                 if (s->picture_structure == PICT_FRAME)
1991                     s->mv_type = MV_TYPE_16X16;
1992                 else
1993                     s->mv_type = MV_TYPE_FIELD;
1994                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1995                     /* if P type, zero motion vector is implied */
1996                     s->mv_dir             = MV_DIR_FORWARD;
1997                     s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1998                     s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1999                     s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
2000                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
2001                 } else {
2002                     /* if B type, reuse previous vectors and directions */
2003                     s->mv[0][0][0] = s->last_mv[0][0][0];
2004                     s->mv[0][0][1] = s->last_mv[0][0][1];
2005                     s->mv[1][0][0] = s->last_mv[1][0][0];
2006                     s->mv[1][0][1] = s->last_mv[1][0][1];
2007                 }
2008             }
2009         }
2010     }
2011 eos: // end of slice
2012     if (get_bits_left(&s->gb) < 0) {
2013         av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
2014         return AVERROR_INVALIDDATA;
2015     }
2016     *buf += (get_bits_count(&s->gb) - 1) / 8;
2017     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);
2018     return 0;
2019 }
2020
2021 static int slice_decode_thread(AVCodecContext *c, void *arg)
2022 {
2023     MpegEncContext *s   = *(void **) arg;
2024     const uint8_t *buf  = s->gb.buffer;
2025     int mb_y            = s->start_mb_y;
2026     const int field_pic = s->picture_structure != PICT_FRAME;
2027
2028     s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
2029
2030     for (;;) {
2031         uint32_t start_code;
2032         int ret;
2033
2034         ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
2035         emms_c();
2036         ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2037                 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
2038                 s->start_mb_y, s->end_mb_y, s->er.error_count);
2039         if (ret < 0) {
2040             if (c->err_recognition & AV_EF_EXPLODE)
2041                 return ret;
2042             if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2043                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2044                                 s->mb_x, s->mb_y,
2045                                 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2046         } else {
2047             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2048                             s->mb_x - 1, s->mb_y,
2049                             ER_AC_END | ER_DC_END | ER_MV_END);
2050         }
2051
2052         if (s->mb_y == s->end_mb_y)
2053             return 0;
2054
2055         start_code = -1;
2056         buf        = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2057         mb_y       = start_code - SLICE_MIN_START_CODE;
2058         if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2059             mb_y += (*buf&0xE0)<<2;
2060         mb_y <<= field_pic;
2061         if (s->picture_structure == PICT_BOTTOM_FIELD)
2062             mb_y++;
2063         if (mb_y < 0 || mb_y >= s->end_mb_y)
2064             return AVERROR_INVALIDDATA;
2065     }
2066 }
2067
2068 /**
2069  * Handle slice ends.
2070  * @return 1 if it seems to be the last slice
2071  */
2072 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2073 {
2074     Mpeg1Context *s1  = avctx->priv_data;
2075     MpegEncContext *s = &s1->mpeg_enc_ctx;
2076
2077     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2078         return 0;
2079
2080     if (s->avctx->hwaccel) {
2081         if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
2082             av_log(avctx, AV_LOG_ERROR,
2083                    "hardware accelerator failed to decode picture\n");
2084     }
2085
2086     /* end of slice reached */
2087     if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2088         /* end of image */
2089
2090         ff_er_frame_end(&s->er);
2091
2092         ff_mpv_frame_end(s);
2093
2094         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2095             int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2096             if (ret < 0)
2097                 return ret;
2098             ff_print_debug_info(s, s->current_picture_ptr, pict);
2099             ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2100         } else {
2101             if (avctx->active_thread_type & FF_THREAD_FRAME)
2102                 s->picture_number++;
2103             /* latency of 1 frame for I- and P-frames */
2104             /* XXX: use another variable than picture_number */
2105             if (s->last_picture_ptr) {
2106                 int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2107                 if (ret < 0)
2108                     return ret;
2109                 ff_print_debug_info(s, s->last_picture_ptr, pict);
2110                 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2111             }
2112         }
2113
2114         return 1;
2115     } else {
2116         return 0;
2117     }
2118 }
2119
2120 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2121                                  const uint8_t *buf, int buf_size)
2122 {
2123     Mpeg1Context *s1  = avctx->priv_data;
2124     MpegEncContext *s = &s1->mpeg_enc_ctx;
2125     int width, height;
2126     int i, v, j;
2127
2128     init_get_bits(&s->gb, buf, buf_size * 8);
2129
2130     width  = get_bits(&s->gb, 12);
2131     height = get_bits(&s->gb, 12);
2132     if (width == 0 || height == 0) {
2133         av_log(avctx, AV_LOG_WARNING,
2134                "Invalid horizontal or vertical size value.\n");
2135         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2136             return AVERROR_INVALIDDATA;
2137     }
2138     s->aspect_ratio_info = get_bits(&s->gb, 4);
2139     if (s->aspect_ratio_info == 0) {
2140         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2141         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2142             return AVERROR_INVALIDDATA;
2143     }
2144     s->frame_rate_index = get_bits(&s->gb, 4);
2145     if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2146         av_log(avctx, AV_LOG_WARNING,
2147                "frame_rate_index %d is invalid\n", s->frame_rate_index);
2148         s->frame_rate_index = 1;
2149     }
2150     s->bit_rate = get_bits(&s->gb, 18) * 400;
2151     if (check_marker(&s->gb, "in sequence header") == 0) {
2152         return AVERROR_INVALIDDATA;
2153     }
2154     s->width  = width;
2155     s->height = height;
2156
2157     s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2158     skip_bits(&s->gb, 1);
2159
2160     /* get matrix */
2161     if (get_bits1(&s->gb)) {
2162         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2163     } else {
2164         for (i = 0; i < 64; i++) {
2165             j = s->idsp.idct_permutation[i];
2166             v = ff_mpeg1_default_intra_matrix[i];
2167             s->intra_matrix[j]        = v;
2168             s->chroma_intra_matrix[j] = v;
2169         }
2170     }
2171     if (get_bits1(&s->gb)) {
2172         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2173     } else {
2174         for (i = 0; i < 64; i++) {
2175             int j = s->idsp.idct_permutation[i];
2176             v = ff_mpeg1_default_non_intra_matrix[i];
2177             s->inter_matrix[j]        = v;
2178             s->chroma_inter_matrix[j] = v;
2179         }
2180     }
2181
2182     if (show_bits(&s->gb, 23) != 0) {
2183         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2184         return AVERROR_INVALIDDATA;
2185     }
2186
2187     /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2188     s->progressive_sequence = 1;
2189     s->progressive_frame    = 1;
2190     s->picture_structure    = PICT_FRAME;
2191     s->first_field          = 0;
2192     s->frame_pred_frame_dct = 1;
2193     s->chroma_format        = 1;
2194     s->codec_id             =
2195     s->avctx->codec_id      = AV_CODEC_ID_MPEG1VIDEO;
2196     s->out_format           = FMT_MPEG1;
2197     s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2198     if (s->avctx->flags & CODEC_FLAG_LOW_DELAY)
2199         s->low_delay = 1;
2200
2201     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2202         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d, aspect_ratio_info: %d \n",
2203                s->avctx->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2204
2205     return 0;
2206 }
2207
2208 static int vcr2_init_sequence(AVCodecContext *avctx)
2209 {
2210     Mpeg1Context *s1  = avctx->priv_data;
2211     MpegEncContext *s = &s1->mpeg_enc_ctx;
2212     int i, v, ret;
2213
2214     /* start new MPEG-1 context decoding */
2215     s->out_format = FMT_MPEG1;
2216     if (s1->mpeg_enc_ctx_allocated) {
2217         ff_mpv_common_end(s);
2218         s1->mpeg_enc_ctx_allocated = 0;
2219     }
2220     s->width            = avctx->coded_width;
2221     s->height           = avctx->coded_height;
2222     avctx->has_b_frames = 0; // true?
2223     s->low_delay        = 1;
2224
2225     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2226     setup_hwaccel_for_pixfmt(avctx);
2227
2228     ff_mpv_idct_init(s);
2229     if ((ret = ff_mpv_common_init(s)) < 0)
2230         return ret;
2231     s1->mpeg_enc_ctx_allocated = 1;
2232
2233     for (i = 0; i < 64; i++) {
2234         int j = s->idsp.idct_permutation[i];
2235         v = ff_mpeg1_default_intra_matrix[i];
2236         s->intra_matrix[j]        = v;
2237         s->chroma_intra_matrix[j] = v;
2238
2239         v = ff_mpeg1_default_non_intra_matrix[i];
2240         s->inter_matrix[j]        = v;
2241         s->chroma_inter_matrix[j] = v;
2242     }
2243
2244     s->progressive_sequence  = 1;
2245     s->progressive_frame     = 1;
2246     s->picture_structure     = PICT_FRAME;
2247     s->first_field           = 0;
2248     s->frame_pred_frame_dct  = 1;
2249     s->chroma_format         = 1;
2250     if (s->codec_tag == AV_RL32("BW10")) {
2251         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2252     } else {
2253         s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2254         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2255     }
2256     s1->save_width           = s->width;
2257     s1->save_height          = s->height;
2258     s1->save_progressive_seq = s->progressive_sequence;
2259     return 0;
2260 }
2261
2262 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2263                               const uint8_t *p, int buf_size)
2264 {
2265     Mpeg1Context *s1 = avctx->priv_data;
2266
2267     if (buf_size >= 6 &&
2268         p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2269         p[4] == 3 && (p[5] & 0x40)) {
2270         /* extract A53 Part 4 CC data */
2271         int cc_count = p[5] & 0x1f;
2272         if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2273             av_freep(&s1->a53_caption);
2274             s1->a53_caption_size = cc_count * 3;
2275             s1->a53_caption      = av_malloc(s1->a53_caption_size);
2276             if (s1->a53_caption)
2277                 memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2278         }
2279         return 1;
2280     } else if (buf_size >= 11 &&
2281                p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2282         /* extract DVD CC data */
2283         int cc_count = 0;
2284         int i;
2285         // There is a caption count field in the data, but it is often
2286         // incorect.  So count the number of captions present.
2287         for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2288             cc_count++;
2289         // Transform the DVD format into A53 Part 4 format
2290         if (cc_count > 0) {
2291             av_freep(&s1->a53_caption);
2292             s1->a53_caption_size = cc_count * 6;
2293             s1->a53_caption      = av_malloc(s1->a53_caption_size);
2294             if (s1->a53_caption) {
2295                 uint8_t field1 = !!(p[4] & 0x80);
2296                 uint8_t *cap = s1->a53_caption;
2297                 p += 5;
2298                 for (i = 0; i < cc_count; i++) {
2299                     cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2300                     cap[1] = p[1];
2301                     cap[2] = p[2];
2302                     cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2303                     cap[4] = p[4];
2304                     cap[5] = p[5];
2305                     cap += 6;
2306                     p += 6;
2307                 }
2308             }
2309         }
2310         return 1;
2311     }
2312     return 0;
2313 }
2314
2315 static void mpeg_decode_user_data(AVCodecContext *avctx,
2316                                   const uint8_t *p, int buf_size)
2317 {
2318     Mpeg1Context *s = avctx->priv_data;
2319     const uint8_t *buf_end = p + buf_size;
2320     Mpeg1Context *s1 = avctx->priv_data;
2321
2322 #if 0
2323     int i;
2324     for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2325         av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2326     }
2327     av_log(avctx, AV_LOG_ERROR, "\n");
2328 #endif
2329
2330     if (buf_size > 29){
2331         int i;
2332         for(i=0; i<20; i++)
2333             if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2334                 s->tmpgexs= 1;
2335             }
2336     }
2337     /* we parse the DTG active format information */
2338     if (buf_end - p >= 5 &&
2339         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2340         int flags = p[4];
2341         p += 5;
2342         if (flags & 0x80) {
2343             /* skip event id */
2344             p += 2;
2345         }
2346         if (flags & 0x40) {
2347             if (buf_end - p < 1)
2348                 return;
2349 #if FF_API_AFD
2350 FF_DISABLE_DEPRECATION_WARNINGS
2351             avctx->dtg_active_format = p[0] & 0x0f;
2352 FF_ENABLE_DEPRECATION_WARNINGS
2353 #endif /* FF_API_AFD */
2354             s1->has_afd = 1;
2355             s1->afd     = p[0] & 0x0f;
2356         }
2357     } else if (buf_end - p >= 6 &&
2358                p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2359                p[4] == 0x03) { // S3D_video_format_length
2360         // the 0x7F mask ignores the reserved_bit value
2361         const uint8_t S3D_video_format_type = p[5] & 0x7F;
2362
2363         if (S3D_video_format_type == 0x03 ||
2364             S3D_video_format_type == 0x04 ||
2365             S3D_video_format_type == 0x08 ||
2366             S3D_video_format_type == 0x23) {
2367
2368             s1->has_stereo3d = 1;
2369
2370             switch (S3D_video_format_type) {
2371             case 0x03:
2372                 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2373                 break;
2374             case 0x04:
2375                 s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2376                 break;
2377             case 0x08:
2378                 s1->stereo3d.type = AV_STEREO3D_2D;
2379                 break;
2380             case 0x23:
2381                 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2382                 break;
2383             }
2384         }
2385     } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2386         return;
2387     }
2388 }
2389
2390 static void mpeg_decode_gop(AVCodecContext *avctx,
2391                             const uint8_t *buf, int buf_size)
2392 {
2393     Mpeg1Context *s1  = avctx->priv_data;
2394     MpegEncContext *s = &s1->mpeg_enc_ctx;
2395     int broken_link;
2396     int64_t tc;
2397
2398     init_get_bits(&s->gb, buf, buf_size * 8);
2399
2400     tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2401
2402     s->closed_gop = get_bits1(&s->gb);
2403     /* broken_link indicate that after editing the
2404      * reference frames of the first B-Frames after GOP I-Frame
2405      * are missing (open gop) */
2406     broken_link = get_bits1(&s->gb);
2407
2408     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2409         char tcbuf[AV_TIMECODE_STR_SIZE];
2410         av_timecode_make_mpeg_tc_string(tcbuf, tc);
2411         av_log(s->avctx, AV_LOG_DEBUG,
2412                "GOP (%s) closed_gop=%d broken_link=%d\n",
2413                tcbuf, s->closed_gop, broken_link);
2414     }
2415 }
2416
2417 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2418                          int *got_output, const uint8_t *buf, int buf_size)
2419 {
2420     Mpeg1Context *s = avctx->priv_data;
2421     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2422     const uint8_t *buf_ptr = buf;
2423     const uint8_t *buf_end = buf + buf_size;
2424     int ret, input_size;
2425     int last_code = 0, skip_frame = 0;
2426     int picture_start_code_seen = 0;
2427
2428     for (;;) {
2429         /* find next start code */
2430         uint32_t start_code = -1;
2431         buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2432         if (start_code > 0x1ff) {
2433             if (!skip_frame) {
2434                 if (HAVE_THREADS &&
2435                     (avctx->active_thread_type & FF_THREAD_SLICE) &&
2436                     !avctx->hwaccel) {
2437                     int i;
2438                     av_assert0(avctx->thread_count > 1);
2439
2440                     avctx->execute(avctx, slice_decode_thread,
2441                                    &s2->thread_context[0], NULL,
2442                                    s->slice_count, sizeof(void *));
2443                     for (i = 0; i < s->slice_count; i++)
2444                         s2->er.error_count += s2->thread_context[i]->er.error_count;
2445                 }
2446
2447                 if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
2448                     && uses_vdpau(avctx))
2449                     ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2450
2451                 ret = slice_end(avctx, picture);
2452                 if (ret < 0)
2453                     return ret;
2454                 else if (ret) {
2455                     // FIXME: merge with the stuff in mpeg_decode_slice
2456                     if (s2->last_picture_ptr || s2->low_delay)
2457                         *got_output = 1;
2458                 }
2459             }
2460             s2->pict_type = 0;
2461
2462             if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2463                 return AVERROR_INVALIDDATA;
2464
2465             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2466         }
2467
2468         input_size = buf_end - buf_ptr;
2469
2470         if (avctx->debug & FF_DEBUG_STARTCODE)
2471             av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2472                    start_code, buf_ptr - buf, input_size);
2473
2474         /* prepare data for next start code */
2475         switch (start_code) {
2476         case SEQ_START_CODE:
2477             if (last_code == 0) {
2478                 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2479                 if (buf != avctx->extradata)
2480                     s->sync = 1;
2481             } else {
2482                 av_log(avctx, AV_LOG_ERROR,
2483                        "ignoring SEQ_START_CODE after %X\n", last_code);
2484                 if (avctx->err_recognition & AV_EF_EXPLODE)
2485                     return AVERROR_INVALIDDATA;
2486             }
2487             break;
2488
2489         case PICTURE_START_CODE:
2490             if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2491                /* If it's a frame picture, there can't be more than one picture header.
2492                   Yet, it does happen and we need to handle it. */
2493                av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2494                break;
2495             }
2496             picture_start_code_seen = 1;
2497
2498             if (s2->width <= 0 || s2->height <= 0) {
2499                 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2500                        s2->width, s2->height);
2501                 return AVERROR_INVALIDDATA;
2502             }
2503
2504             if (s->tmpgexs){
2505                 s2->intra_dc_precision= 3;
2506                 s2->intra_matrix[0]= 1;
2507             }
2508             if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2509                 !avctx->hwaccel && s->slice_count) {
2510                 int i;
2511
2512                 avctx->execute(avctx, slice_decode_thread,
2513                                s2->thread_context, NULL,
2514                                s->slice_count, sizeof(void *));
2515                 for (i = 0; i < s->slice_count; i++)
2516                     s2->er.error_count += s2->thread_context[i]->er.error_count;
2517                 s->slice_count = 0;
2518             }
2519             if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2520                 ret = mpeg_decode_postinit(avctx);
2521                 if (ret < 0) {
2522                     av_log(avctx, AV_LOG_ERROR,
2523                            "mpeg_decode_postinit() failure\n");
2524                     return ret;
2525                 }
2526
2527                 /* We have a complete image: we try to decompress it. */
2528                 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2529                     s2->pict_type = 0;
2530                 s->first_slice = 1;
2531                 last_code      = PICTURE_START_CODE;
2532             } else {
2533                 av_log(avctx, AV_LOG_ERROR,
2534                        "ignoring pic after %X\n", last_code);
2535                 if (avctx->err_recognition & AV_EF_EXPLODE)
2536                     return AVERROR_INVALIDDATA;
2537             }
2538             break;
2539         case EXT_START_CODE:
2540             init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2541
2542             switch (get_bits(&s2->gb, 4)) {
2543             case 0x1:
2544                 if (last_code == 0) {
2545                     mpeg_decode_sequence_extension(s);
2546                 } else {
2547                     av_log(avctx, AV_LOG_ERROR,
2548                            "ignoring seq ext after %X\n", last_code);
2549                     if (avctx->err_recognition & AV_EF_EXPLODE)
2550                         return AVERROR_INVALIDDATA;
2551                 }
2552                 break;
2553             case 0x2:
2554                 mpeg_decode_sequence_display_extension(s);
2555                 break;
2556             case 0x3:
2557                 mpeg_decode_quant_matrix_extension(s2);
2558                 break;
2559             case 0x7:
2560                 mpeg_decode_picture_display_extension(s);
2561                 break;
2562             case 0x8:
2563                 if (last_code == PICTURE_START_CODE) {
2564                     mpeg_decode_picture_coding_extension(s);
2565                 } else {
2566                     av_log(avctx, AV_LOG_ERROR,
2567                            "ignoring pic cod ext after %X\n", last_code);
2568                     if (avctx->err_recognition & AV_EF_EXPLODE)
2569                         return AVERROR_INVALIDDATA;
2570                 }
2571                 break;
2572             }
2573             break;
2574         case USER_START_CODE:
2575             mpeg_decode_user_data(avctx, buf_ptr, input_size);
2576             break;
2577         case GOP_START_CODE:
2578             if (last_code == 0) {
2579                 s2->first_field = 0;
2580                 mpeg_decode_gop(avctx, buf_ptr, input_size);
2581                 s->sync = 1;
2582             } else {
2583                 av_log(avctx, AV_LOG_ERROR,
2584                        "ignoring GOP_START_CODE after %X\n", last_code);
2585                 if (avctx->err_recognition & AV_EF_EXPLODE)
2586                     return AVERROR_INVALIDDATA;
2587             }
2588             break;
2589         default:
2590             if (start_code >= SLICE_MIN_START_CODE &&
2591                 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2592                 if (s2->progressive_sequence && !s2->progressive_frame) {
2593                     s2->progressive_frame = 1;
2594                     av_log(s2->avctx, AV_LOG_ERROR,
2595                            "interlaced frame in progressive sequence, ignoring\n");
2596                 }
2597
2598                 if (s2->picture_structure == 0 ||
2599                     (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2600                     av_log(s2->avctx, AV_LOG_ERROR,
2601                            "picture_structure %d invalid, ignoring\n",
2602                            s2->picture_structure);
2603                     s2->picture_structure = PICT_FRAME;
2604                 }
2605
2606                 if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2607                     av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2608
2609                 if (s2->picture_structure == PICT_FRAME) {
2610                     s2->first_field = 0;
2611                     s2->v_edge_pos  = 16 * s2->mb_height;
2612                 } else {
2613                     s2->first_field ^= 1;
2614                     s2->v_edge_pos   = 8 * s2->mb_height;
2615                     memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2616                 }
2617             }
2618             if (start_code >= SLICE_MIN_START_CODE &&
2619                 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2620                 const int field_pic = s2->picture_structure != PICT_FRAME;
2621                 int mb_y = start_code - SLICE_MIN_START_CODE;
2622                 last_code = SLICE_MIN_START_CODE;
2623                 if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2624                     mb_y += (*buf_ptr&0xE0)<<2;
2625
2626                 mb_y <<= field_pic;
2627                 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2628                     mb_y++;
2629
2630                 if (buf_end - buf_ptr < 2) {
2631                     av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2632                     return AVERROR_INVALIDDATA;
2633                 }
2634
2635                 if (mb_y >= s2->mb_height) {
2636                     av_log(s2->avctx, AV_LOG_ERROR,
2637                            "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2638                     return AVERROR_INVALIDDATA;
2639                 }
2640
2641                 if (!s2->last_picture_ptr) {
2642                     /* Skip B-frames if we do not have reference frames and
2643                      * GOP is not closed. */
2644                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
2645                         if (!s2->closed_gop) {
2646                             skip_frame = 1;
2647                             break;
2648                         }
2649                     }
2650                 }
2651                 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->avctx->flags2 & CODEC_FLAG2_SHOW_ALL))
2652                     s->sync = 1;
2653                 if (!s2->next_picture_ptr) {
2654                     /* Skip P-frames if we do not have a reference frame or
2655                      * we have an invalid header. */
2656                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2657                         skip_frame = 1;
2658                         break;
2659                     }
2660                 }
2661                 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2662                      s2->pict_type == AV_PICTURE_TYPE_B) ||
2663                     (avctx->skip_frame >= AVDISCARD_NONKEY &&
2664                      s2->pict_type != AV_PICTURE_TYPE_I) ||
2665                     avctx->skip_frame >= AVDISCARD_ALL) {
2666                     skip_frame = 1;
2667                     break;
2668                 }
2669
2670                 if (!s->mpeg_enc_ctx_allocated)
2671                     break;
2672
2673                 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2674                     if (mb_y < avctx->skip_top ||
2675                         mb_y >= s2->mb_height - avctx->skip_bottom)
2676                         break;
2677                 }
2678
2679                 if (!s2->pict_type) {
2680                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2681                     if (avctx->err_recognition & AV_EF_EXPLODE)
2682                         return AVERROR_INVALIDDATA;
2683                     break;
2684                 }
2685
2686                 if (s->first_slice) {
2687                     skip_frame     = 0;
2688                     s->first_slice = 0;
2689                     if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2690                         return ret;
2691                 }
2692                 if (!s2->current_picture_ptr) {
2693                     av_log(avctx, AV_LOG_ERROR,
2694                            "current_picture not initialized\n");
2695                     return AVERROR_INVALIDDATA;
2696                 }
2697
2698                 if (uses_vdpau(avctx)) {
2699                     s->slice_count++;
2700                     break;
2701                 }
2702
2703                 if (HAVE_THREADS &&
2704                     (avctx->active_thread_type & FF_THREAD_SLICE) &&
2705                     !avctx->hwaccel) {
2706                     int threshold = (s2->mb_height * s->slice_count +
2707                                      s2->slice_context_count / 2) /
2708                                     s2->slice_context_count;
2709                     av_assert0(avctx->thread_count > 1);
2710                     if (threshold <= mb_y) {
2711                         MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2712
2713                         thread_context->start_mb_y = mb_y;
2714                         thread_context->end_mb_y   = s2->mb_height;
2715                         if (s->slice_count) {
2716                             s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2717                             ret = ff_update_duplicate_context(thread_context, s2);
2718                             if (ret < 0)
2719                                 return ret;
2720                         }
2721                         init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2722                         s->slice_count++;
2723                     }
2724                     buf_ptr += 2; // FIXME add minimum number of bytes per slice
2725                 } else {
2726                     ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2727                     emms_c();
2728
2729                     if (ret < 0) {
2730                         if (avctx->err_recognition & AV_EF_EXPLODE)
2731                             return ret;
2732                         if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2733                             ff_er_add_slice(&s2->er, s2->resync_mb_x,
2734                                             s2->resync_mb_y, s2->mb_x, s2->mb_y,
2735                                             ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2736                     } else {
2737                         ff_er_add_slice(&s2->er, s2->resync_mb_x,
2738                                         s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2739                                         ER_AC_END | ER_DC_END | ER_MV_END);
2740                     }
2741                 }
2742             }
2743             break;
2744         }
2745     }
2746 }
2747
2748 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2749                              int *got_output, AVPacket *avpkt)
2750 {
2751     const uint8_t *buf = avpkt->data;
2752     int ret;
2753     int buf_size = avpkt->size;
2754     Mpeg1Context *s = avctx->priv_data;
2755     AVFrame *picture = data;
2756     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2757
2758     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2759         /* special case for last picture */
2760         if (s2->low_delay == 0 && s2->next_picture_ptr) {
2761             int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2762             if (ret < 0)
2763                 return ret;
2764
2765             s2->next_picture_ptr = NULL;
2766
2767             *got_output = 1;
2768         }
2769         return buf_size;
2770     }
2771
2772     if (s2->avctx->flags & CODEC_FLAG_TRUNCATED) {
2773         int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2774                                            buf_size, NULL);
2775
2776         if (ff_combine_frame(&s2->parse_context, next,
2777                              (const uint8_t **) &buf, &buf_size) < 0)
2778             return buf_size;
2779     }
2780
2781     s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2782     if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2783                                            || s2->codec_tag == AV_RL32("BW10")
2784                                           ))
2785         vcr2_init_sequence(avctx);
2786
2787     s->slice_count = 0;
2788
2789     if (avctx->extradata && !s->extradata_decoded) {
2790         ret = decode_chunks(avctx, picture, got_output,
2791                             avctx->extradata, avctx->extradata_size);
2792         if (*got_output) {
2793             av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2794             *got_output = 0;
2795         }
2796         s->extradata_decoded = 1;
2797         if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2798             s2->current_picture_ptr = NULL;
2799             return ret;
2800         }
2801     }
2802
2803     ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2804     if (ret<0 || *got_output)
2805         s2->current_picture_ptr = NULL;
2806
2807     return ret;
2808 }
2809
2810 static void flush(AVCodecContext *avctx)
2811 {
2812     Mpeg1Context *s = avctx->priv_data;
2813
2814     s->sync       = 0;
2815
2816     ff_mpeg_flush(avctx);
2817 }
2818
2819 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2820 {
2821     Mpeg1Context *s = avctx->priv_data;
2822
2823     if (s->mpeg_enc_ctx_allocated)
2824         ff_mpv_common_end(&s->mpeg_enc_ctx);
2825     av_freep(&s->a53_caption);
2826     return 0;
2827 }
2828
2829 static const AVProfile mpeg2_video_profiles[] = {
2830     { FF_PROFILE_MPEG2_422,          "4:2:2"              },
2831     { FF_PROFILE_MPEG2_HIGH,         "High"               },
2832     { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
2833     { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
2834     { FF_PROFILE_MPEG2_MAIN,         "Main"               },
2835     { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
2836     { FF_PROFILE_RESERVED,           "Reserved"           },
2837     { FF_PROFILE_RESERVED,           "Reserved"           },
2838     { FF_PROFILE_UNKNOWN                                  },
2839 };
2840
2841 AVCodec ff_mpeg1video_decoder = {
2842     .name                  = "mpeg1video",
2843     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2844     .type                  = AVMEDIA_TYPE_VIDEO,
2845     .id                    = AV_CODEC_ID_MPEG1VIDEO,
2846     .priv_data_size        = sizeof(Mpeg1Context),
2847     .init                  = mpeg_decode_init,
2848     .close                 = mpeg_decode_end,
2849     .decode                = mpeg_decode_frame,
2850     .capabilities          = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2851                              CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2852                              CODEC_CAP_SLICE_THREADS,
2853     .flush                 = flush,
2854     .max_lowres            = 3,
2855     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2856 };
2857
2858 AVCodec ff_mpeg2video_decoder = {
2859     .name           = "mpeg2video",
2860     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2861     .type           = AVMEDIA_TYPE_VIDEO,
2862     .id             = AV_CODEC_ID_MPEG2VIDEO,
2863     .priv_data_size = sizeof(Mpeg1Context),
2864     .init           = mpeg_decode_init,
2865     .close          = mpeg_decode_end,
2866     .decode         = mpeg_decode_frame,
2867     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2868                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2869                       CODEC_CAP_SLICE_THREADS,
2870     .flush          = flush,
2871     .max_lowres     = 3,
2872     .profiles       = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2873 };
2874
2875 //legacy decoder
2876 AVCodec ff_mpegvideo_decoder = {
2877     .name           = "mpegvideo",
2878     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2879     .type           = AVMEDIA_TYPE_VIDEO,
2880     .id             = AV_CODEC_ID_MPEG2VIDEO,
2881     .priv_data_size = sizeof(Mpeg1Context),
2882     .init           = mpeg_decode_init,
2883     .close          = mpeg_decode_end,
2884     .decode         = mpeg_decode_frame,
2885     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2886     .flush          = flush,
2887     .max_lowres     = 3,
2888 };
2889
2890 #if FF_API_XVMC
2891 #if CONFIG_MPEG_XVMC_DECODER
2892 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2893 {
2894     if (avctx->active_thread_type & FF_THREAD_SLICE)
2895         return -1;
2896     if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2897         return -1;
2898     if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2899         ff_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2900     }
2901     mpeg_decode_init(avctx);
2902
2903     avctx->pix_fmt           = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2904     avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2905
2906     return 0;
2907 }
2908
2909 AVCodec ff_mpeg_xvmc_decoder = {
2910     .name           = "mpegvideo_xvmc",
2911     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2912     .type           = AVMEDIA_TYPE_VIDEO,
2913     .id             = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2914     .priv_data_size = sizeof(Mpeg1Context),
2915     .init           = mpeg_mc_decode_init,
2916     .close          = mpeg_decode_end,
2917     .decode         = mpeg_decode_frame,
2918     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2919                       CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2920     .flush          = flush,
2921 };
2922
2923 #endif
2924 #endif /* FF_API_XVMC */
2925
2926 #if CONFIG_MPEG_VDPAU_DECODER
2927 AVCodec ff_mpeg_vdpau_decoder = {
2928     .name           = "mpegvideo_vdpau",
2929     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2930     .type           = AVMEDIA_TYPE_VIDEO,
2931     .id             = AV_CODEC_ID_MPEG2VIDEO,
2932     .priv_data_size = sizeof(Mpeg1Context),
2933     .init           = mpeg_decode_init,
2934     .close          = mpeg_decode_end,
2935     .decode         = mpeg_decode_frame,
2936     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2937                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2938     .flush          = flush,
2939 };
2940 #endif
2941
2942 #if CONFIG_MPEG1_VDPAU_DECODER
2943 AVCodec ff_mpeg1_vdpau_decoder = {
2944     .name           = "mpeg1video_vdpau",
2945     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2946     .type           = AVMEDIA_TYPE_VIDEO,
2947     .id             = AV_CODEC_ID_MPEG1VIDEO,
2948     .priv_data_size = sizeof(Mpeg1Context),
2949     .init           = mpeg_decode_init,
2950     .close          = mpeg_decode_end,
2951     .decode         = mpeg_decode_frame,
2952     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2953                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2954     .flush          = flush,
2955 };
2956 #endif