Merge commit '4b1f5e5090abed6c618c8ba380cd7d28d140f867'
[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/internal.h"
33 #include "libavutil/stereo3d.h"
34
35 #include "avcodec.h"
36 #include "bytestream.h"
37 #include "error_resilience.h"
38 #include "idctdsp.h"
39 #include "internal.h"
40 #include "mpeg_er.h"
41 #include "mpeg12.h"
42 #include "mpeg12data.h"
43 #include "mpegutils.h"
44 #include "mpegvideo.h"
45 #include "thread.h"
46 #include "version.h"
47 #include "vdpau_internal.h"
48 #include "xvmc_internal.h"
49
50 typedef struct Mpeg1Context {
51     MpegEncContext mpeg_enc_ctx;
52     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
53     int repeat_field;           /* true if we must repeat the field */
54     AVPanScan pan_scan;         /* some temporary storage for the panscan */
55     AVStereo3D stereo3d;
56     int has_stereo3d;
57     uint8_t *a53_caption;
58     int a53_caption_size;
59     uint8_t afd;
60     int has_afd;
61     int slice_count;
62     int save_aspect_info;
63     int save_width, save_height, save_progressive_seq;
64     AVRational frame_rate_ext;  /* MPEG-2 specific framerate modificator */
65     int sync;                   /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
66     int tmpgexs;
67     int first_slice;
68     int extradata_decoded;
69 } Mpeg1Context;
70
71 #define MB_TYPE_ZERO_MV   0x20000000
72
73 static const uint32_t ptype2mb_type[7] = {
74                     MB_TYPE_INTRA,
75                     MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
76                     MB_TYPE_L0,
77                     MB_TYPE_L0 | MB_TYPE_CBP,
78     MB_TYPE_QUANT | MB_TYPE_INTRA,
79     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
80     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
81 };
82
83 static const uint32_t btype2mb_type[11] = {
84                     MB_TYPE_INTRA,
85                     MB_TYPE_L1,
86                     MB_TYPE_L1   | MB_TYPE_CBP,
87                     MB_TYPE_L0,
88                     MB_TYPE_L0   | MB_TYPE_CBP,
89                     MB_TYPE_L0L1,
90                     MB_TYPE_L0L1 | MB_TYPE_CBP,
91     MB_TYPE_QUANT | MB_TYPE_INTRA,
92     MB_TYPE_QUANT | MB_TYPE_L1   | MB_TYPE_CBP,
93     MB_TYPE_QUANT | MB_TYPE_L0   | MB_TYPE_CBP,
94     MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
95 };
96
97 static const uint8_t non_linear_qscale[32] = {
98      0,  1,  2,  3,  4,  5,   6,   7,
99      8, 10, 12, 14, 16, 18,  20,  22,
100     24, 28, 32, 36, 40, 44,  48,  52,
101     56, 64, 72, 80, 88, 96, 104, 112,
102 };
103
104 /* as H.263, but only 17 codes */
105 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
106 {
107     int code, sign, val, shift;
108
109     code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
110     if (code == 0)
111         return pred;
112     if (code < 0)
113         return 0xffff;
114
115     sign  = get_bits1(&s->gb);
116     shift = fcode - 1;
117     val   = code;
118     if (shift) {
119         val  = (val - 1) << shift;
120         val |= get_bits(&s->gb, shift);
121         val++;
122     }
123     if (sign)
124         val = -val;
125     val += pred;
126
127     /* modulo decoding */
128     return sign_extend(val, 5 + shift);
129 }
130
131 #define check_scantable_index(ctx, x)                                         \
132     do {                                                                      \
133         if ((x) > 63) {                                                       \
134             av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",     \
135                    ctx->mb_x, ctx->mb_y);                                     \
136             return AVERROR_INVALIDDATA;                                       \
137         }                                                                     \
138     } while (0)
139
140 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
141                                            int16_t *block, int n)
142 {
143     int level, dc, diff, i, j, run;
144     int component;
145     RLTable *rl                  = &ff_rl_mpeg1;
146     uint8_t *const scantable     = s->intra_scantable.permutated;
147     const uint16_t *quant_matrix = s->intra_matrix;
148     const int qscale             = s->qscale;
149
150     /* DC coefficient */
151     component = (n <= 3 ? 0 : n - 4 + 1);
152     diff = decode_dc(&s->gb, component);
153     if (diff >= 0xffff)
154         return -1;
155     dc  = s->last_dc[component];
156     dc += diff;
157     s->last_dc[component] = dc;
158     block[0] = dc * quant_matrix[0];
159     av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
160     i = 0;
161     {
162         OPEN_READER(re, &s->gb);
163         UPDATE_CACHE(re, &s->gb);
164         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
165             goto end;
166
167         /* now quantify & encode AC coefficients */
168         for (;;) {
169             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
170                        TEX_VLC_BITS, 2, 0);
171
172             if (level != 0) {
173                 i += run;
174                 check_scantable_index(s, i);
175                 j = scantable[i];
176                 level = (level * qscale * quant_matrix[j]) >> 4;
177                 level = (level - 1) | 1;
178                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
179                         SHOW_SBITS(re, &s->gb, 1);
180                 SKIP_BITS(re, &s->gb, 1);
181             } else {
182                 /* escape */
183                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
184                 LAST_SKIP_BITS(re, &s->gb, 6);
185                 UPDATE_CACHE(re, &s->gb);
186                 level = SHOW_SBITS(re, &s->gb, 8);
187                 SKIP_BITS(re, &s->gb, 8);
188                 if (level == -128) {
189                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
190                     SKIP_BITS(re, &s->gb, 8);
191                 } else if (level == 0) {
192                     level = SHOW_UBITS(re, &s->gb, 8);
193                     SKIP_BITS(re, &s->gb, 8);
194                 }
195                 i += run;
196                 check_scantable_index(s, i);
197                 j = scantable[i];
198                 if (level < 0) {
199                     level = -level;
200                     level = (level * qscale * quant_matrix[j]) >> 4;
201                     level = (level - 1) | 1;
202                     level = -level;
203                 } else {
204                     level = (level * qscale * quant_matrix[j]) >> 4;
205                     level = (level - 1) | 1;
206                 }
207             }
208
209             block[j] = level;
210             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
211                break;
212
213             UPDATE_CACHE(re, &s->gb);
214         }
215 end:
216         LAST_SKIP_BITS(re, &s->gb, 2);
217         CLOSE_READER(re, &s->gb);
218     }
219     s->block_last_index[n] = i;
220     return 0;
221 }
222
223 int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
224 {
225     return mpeg1_decode_block_intra(s, block, n);
226 }
227
228 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
229                                            int16_t *block, int n)
230 {
231     int level, i, j, run;
232     RLTable *rl                  = &ff_rl_mpeg1;
233     uint8_t *const scantable     = s->intra_scantable.permutated;
234     const uint16_t *quant_matrix = s->inter_matrix;
235     const int qscale             = s->qscale;
236
237     {
238         OPEN_READER(re, &s->gb);
239         i = -1;
240         // special case for first coefficient, no need to add second VLC table
241         UPDATE_CACHE(re, &s->gb);
242         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
243             level = (3 * qscale * quant_matrix[0]) >> 5;
244             level = (level - 1) | 1;
245             if (GET_CACHE(re, &s->gb) & 0x40000000)
246                 level = -level;
247             block[0] = level;
248             i++;
249             SKIP_BITS(re, &s->gb, 2);
250             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
251                 goto end;
252         }
253         /* now quantify & encode AC coefficients */
254         for (;;) {
255             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
256                        TEX_VLC_BITS, 2, 0);
257
258             if (level != 0) {
259                 i += run;
260                 check_scantable_index(s, i);
261                 j = scantable[i];
262                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
263                 level = (level - 1) | 1;
264                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
265                         SHOW_SBITS(re, &s->gb, 1);
266                 SKIP_BITS(re, &s->gb, 1);
267             } else {
268                 /* escape */
269                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
270                 LAST_SKIP_BITS(re, &s->gb, 6);
271                 UPDATE_CACHE(re, &s->gb);
272                 level = SHOW_SBITS(re, &s->gb, 8);
273                 SKIP_BITS(re, &s->gb, 8);
274                 if (level == -128) {
275                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
276                     SKIP_BITS(re, &s->gb, 8);
277                 } else if (level == 0) {
278                     level = SHOW_UBITS(re, &s->gb, 8);
279                     SKIP_BITS(re, &s->gb, 8);
280                 }
281                 i += run;
282                 check_scantable_index(s, i);
283                 j = scantable[i];
284                 if (level < 0) {
285                     level = -level;
286                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
287                     level = (level - 1) | 1;
288                     level = -level;
289                 } else {
290                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
291                     level = (level - 1) | 1;
292                 }
293             }
294
295             block[j] = level;
296             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
297                 break;
298             UPDATE_CACHE(re, &s->gb);
299         }
300 end:
301         LAST_SKIP_BITS(re, &s->gb, 2);
302         CLOSE_READER(re, &s->gb);
303     }
304     s->block_last_index[n] = i;
305     return 0;
306 }
307
308 /**
309  * Note: this function can read out of range and crash for corrupt streams.
310  * Changing this would eat up any speed benefits it has.
311  * Do not use "fast" flag if you need the code to be robust.
312  */
313 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
314                                                 int16_t *block, int n)
315 {
316     int level, i, j, run;
317     RLTable *rl              = &ff_rl_mpeg1;
318     uint8_t *const scantable = s->intra_scantable.permutated;
319     const int qscale         = s->qscale;
320
321     {
322         OPEN_READER(re, &s->gb);
323         i = -1;
324         // Special case for first coefficient, no need to add second VLC table.
325         UPDATE_CACHE(re, &s->gb);
326         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
327             level = (3 * qscale) >> 1;
328             level = (level - 1) | 1;
329             if (GET_CACHE(re, &s->gb) & 0x40000000)
330                 level = -level;
331             block[0] = level;
332             i++;
333             SKIP_BITS(re, &s->gb, 2);
334             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
335                 goto end;
336         }
337
338         /* now quantify & encode AC coefficients */
339         for (;;) {
340             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
341                        TEX_VLC_BITS, 2, 0);
342
343             if (level != 0) {
344                 i += run;
345                 check_scantable_index(s, i);
346                 j = scantable[i];
347                 level = ((level * 2 + 1) * qscale) >> 1;
348                 level = (level - 1) | 1;
349                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
350                         SHOW_SBITS(re, &s->gb, 1);
351                 SKIP_BITS(re, &s->gb, 1);
352             } else {
353                 /* escape */
354                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
355                 LAST_SKIP_BITS(re, &s->gb, 6);
356                 UPDATE_CACHE(re, &s->gb);
357                 level = SHOW_SBITS(re, &s->gb, 8);
358                 SKIP_BITS(re, &s->gb, 8);
359                 if (level == -128) {
360                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
361                     SKIP_BITS(re, &s->gb, 8);
362                 } else if (level == 0) {
363                     level = SHOW_UBITS(re, &s->gb, 8);
364                     SKIP_BITS(re, &s->gb, 8);
365                 }
366                 i += run;
367                 check_scantable_index(s, i);
368                 j = scantable[i];
369                 if (level < 0) {
370                     level = -level;
371                     level = ((level * 2 + 1) * qscale) >> 1;
372                     level = (level - 1) | 1;
373                     level = -level;
374                 } else {
375                     level = ((level * 2 + 1) * qscale) >> 1;
376                     level = (level - 1) | 1;
377                 }
378             }
379
380             block[j] = level;
381             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
382                 break;
383             UPDATE_CACHE(re, &s->gb);
384         }
385 end:
386         LAST_SKIP_BITS(re, &s->gb, 2);
387         CLOSE_READER(re, &s->gb);
388     }
389     s->block_last_index[n] = i;
390     return 0;
391 }
392
393 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
394                                                int16_t *block, int n)
395 {
396     int level, i, j, run;
397     RLTable *rl = &ff_rl_mpeg1;
398     uint8_t *const scantable = s->intra_scantable.permutated;
399     const uint16_t *quant_matrix;
400     const int qscale = s->qscale;
401     int mismatch;
402
403     mismatch = 1;
404
405     {
406         OPEN_READER(re, &s->gb);
407         i = -1;
408         if (n < 4)
409             quant_matrix = s->inter_matrix;
410         else
411             quant_matrix = s->chroma_inter_matrix;
412
413         // Special case for first coefficient, no need to add second VLC table.
414         UPDATE_CACHE(re, &s->gb);
415         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
416             level = (3 * qscale * quant_matrix[0]) >> 5;
417             if (GET_CACHE(re, &s->gb) & 0x40000000)
418                 level = -level;
419             block[0]  = level;
420             mismatch ^= level;
421             i++;
422             SKIP_BITS(re, &s->gb, 2);
423             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
424                 goto end;
425         }
426
427         /* now quantify & encode AC coefficients */
428         for (;;) {
429             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
430                        TEX_VLC_BITS, 2, 0);
431
432             if (level != 0) {
433                 i += run;
434                 check_scantable_index(s, i);
435                 j = scantable[i];
436                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
437                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
438                         SHOW_SBITS(re, &s->gb, 1);
439                 SKIP_BITS(re, &s->gb, 1);
440             } else {
441                 /* escape */
442                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
443                 LAST_SKIP_BITS(re, &s->gb, 6);
444                 UPDATE_CACHE(re, &s->gb);
445                 level = SHOW_SBITS(re, &s->gb, 12);
446                 SKIP_BITS(re, &s->gb, 12);
447
448                 i += run;
449                 check_scantable_index(s, i);
450                 j = scantable[i];
451                 if (level < 0) {
452                     level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
453                     level = -level;
454                 } else {
455                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
456                 }
457             }
458
459             mismatch ^= level;
460             block[j]  = level;
461             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
462                 break;
463             UPDATE_CACHE(re, &s->gb);
464         }
465 end:
466         LAST_SKIP_BITS(re, &s->gb, 2);
467         CLOSE_READER(re, &s->gb);
468     }
469     block[63] ^= (mismatch & 1);
470
471     s->block_last_index[n] = i;
472     return 0;
473 }
474
475 /**
476  * Note: this function can read out of range and crash for corrupt streams.
477  * Changing this would eat up any speed benefits it has.
478  * Do not use "fast" flag if you need the code to be robust.
479  */
480 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
481                                                     int16_t *block, int n)
482 {
483     int level, i, j, run;
484     RLTable *rl              = &ff_rl_mpeg1;
485     uint8_t *const scantable = s->intra_scantable.permutated;
486     const int qscale         = s->qscale;
487     OPEN_READER(re, &s->gb);
488     i = -1;
489
490     // special case for first coefficient, no need to add second VLC table
491     UPDATE_CACHE(re, &s->gb);
492     if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
493         level = (3 * qscale) >> 1;
494         if (GET_CACHE(re, &s->gb) & 0x40000000)
495             level = -level;
496         block[0] = level;
497         i++;
498         SKIP_BITS(re, &s->gb, 2);
499         if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
500             goto end;
501     }
502
503     /* now quantify & encode AC coefficients */
504     for (;;) {
505         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
506
507         if (level != 0) {
508             i += run;
509             j = scantable[i];
510             level = ((level * 2 + 1) * qscale) >> 1;
511             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
512                     SHOW_SBITS(re, &s->gb, 1);
513             SKIP_BITS(re, &s->gb, 1);
514         } else {
515             /* escape */
516             run = SHOW_UBITS(re, &s->gb, 6) + 1;
517             LAST_SKIP_BITS(re, &s->gb, 6);
518             UPDATE_CACHE(re, &s->gb);
519             level = SHOW_SBITS(re, &s->gb, 12);
520             SKIP_BITS(re, &s->gb, 12);
521
522             i += run;
523             j = scantable[i];
524             if (level < 0) {
525                 level = ((-level * 2 + 1) * qscale) >> 1;
526                 level = -level;
527             } else {
528                 level = ((level * 2 + 1) * qscale) >> 1;
529             }
530         }
531
532         block[j] = level;
533         if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
534             break;
535
536         UPDATE_CACHE(re, &s->gb);
537     }
538 end:
539     LAST_SKIP_BITS(re, &s->gb, 2);
540     CLOSE_READER(re, &s->gb);
541     s->block_last_index[n] = i;
542     return 0;
543 }
544
545 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
546                                            int16_t *block, int n)
547 {
548     int level, dc, diff, i, j, run;
549     int component;
550     RLTable *rl;
551     uint8_t *const scantable = s->intra_scantable.permutated;
552     const uint16_t *quant_matrix;
553     const int qscale = s->qscale;
554     int mismatch;
555
556     /* DC coefficient */
557     if (n < 4) {
558         quant_matrix = s->intra_matrix;
559         component    = 0;
560     } else {
561         quant_matrix = s->chroma_intra_matrix;
562         component    = (n & 1) + 1;
563     }
564     diff = decode_dc(&s->gb, component);
565     if (diff >= 0xffff)
566         return -1;
567     dc  = s->last_dc[component];
568     dc += diff;
569     s->last_dc[component] = dc;
570     block[0] = dc << (3 - s->intra_dc_precision);
571     av_dlog(s->avctx, "dc=%d\n", block[0]);
572     mismatch = block[0] ^ 1;
573     i = 0;
574     if (s->intra_vlc_format)
575         rl = &ff_rl_mpeg2;
576     else
577         rl = &ff_rl_mpeg1;
578
579     {
580         OPEN_READER(re, &s->gb);
581         /* now quantify & encode AC coefficients */
582         for (;;) {
583             UPDATE_CACHE(re, &s->gb);
584             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
585                        TEX_VLC_BITS, 2, 0);
586
587             if (level == 127) {
588                 break;
589             } else if (level != 0) {
590                 i += run;
591                 check_scantable_index(s, i);
592                 j = scantable[i];
593                 level = (level * qscale * quant_matrix[j]) >> 4;
594                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
595                         SHOW_SBITS(re, &s->gb, 1);
596                 LAST_SKIP_BITS(re, &s->gb, 1);
597             } else {
598                 /* escape */
599                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
600                 LAST_SKIP_BITS(re, &s->gb, 6);
601                 UPDATE_CACHE(re, &s->gb);
602                 level = SHOW_SBITS(re, &s->gb, 12);
603                 SKIP_BITS(re, &s->gb, 12);
604                 i += run;
605                 check_scantable_index(s, i);
606                 j = scantable[i];
607                 if (level < 0) {
608                     level = (-level * qscale * quant_matrix[j]) >> 4;
609                     level = -level;
610                 } else {
611                     level = (level * qscale * quant_matrix[j]) >> 4;
612                 }
613             }
614
615             mismatch ^= level;
616             block[j]  = level;
617         }
618         CLOSE_READER(re, &s->gb);
619     }
620     block[63] ^= mismatch & 1;
621
622     s->block_last_index[n] = i;
623     return 0;
624 }
625
626 /**
627  * Note: this function can read out of range and crash for corrupt streams.
628  * Changing this would eat up any speed benefits it has.
629  * Do not use "fast" flag if you need the code to be robust.
630  */
631 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
632                                                 int16_t *block, int n)
633 {
634     int level, dc, diff, i, j, run;
635     int component;
636     RLTable *rl;
637     uint8_t *const scantable = s->intra_scantable.permutated;
638     const uint16_t *quant_matrix;
639     const int qscale = s->qscale;
640
641     /* DC coefficient */
642     if (n < 4) {
643         quant_matrix = s->intra_matrix;
644         component    = 0;
645     } else {
646         quant_matrix = s->chroma_intra_matrix;
647         component    = (n & 1) + 1;
648     }
649     diff = decode_dc(&s->gb, component);
650     if (diff >= 0xffff)
651         return -1;
652     dc = s->last_dc[component];
653     dc += diff;
654     s->last_dc[component] = dc;
655     block[0] = dc << (3 - s->intra_dc_precision);
656     i = 0;
657     if (s->intra_vlc_format)
658         rl = &ff_rl_mpeg2;
659     else
660         rl = &ff_rl_mpeg1;
661
662     {
663         OPEN_READER(re, &s->gb);
664         /* now quantify & encode AC coefficients */
665         for (;;) {
666             UPDATE_CACHE(re, &s->gb);
667             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
668                        TEX_VLC_BITS, 2, 0);
669
670             if (level >= 64 || i > 63) {
671                 break;
672             } else if (level != 0) {
673                 i += run;
674                 j = scantable[i];
675                 level = (level * qscale * quant_matrix[j]) >> 4;
676                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
677                         SHOW_SBITS(re, &s->gb, 1);
678                 LAST_SKIP_BITS(re, &s->gb, 1);
679             } else {
680                 /* escape */
681                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
682                 LAST_SKIP_BITS(re, &s->gb, 6);
683                 UPDATE_CACHE(re, &s->gb);
684                 level = SHOW_SBITS(re, &s->gb, 12);
685                 SKIP_BITS(re, &s->gb, 12);
686                 i += run;
687                 j = scantable[i];
688                 if (level < 0) {
689                     level = (-level * qscale * quant_matrix[j]) >> 4;
690                     level = -level;
691                 } else {
692                     level = (level * qscale * quant_matrix[j]) >> 4;
693                 }
694             }
695
696             block[j] = level;
697         }
698         CLOSE_READER(re, &s->gb);
699     }
700
701     s->block_last_index[n] = i;
702     return 0;
703 }
704
705 /******************************************/
706 /* decoding */
707
708 static inline int get_dmv(MpegEncContext *s)
709 {
710     if (get_bits1(&s->gb))
711         return 1 - (get_bits1(&s->gb) << 1);
712     else
713         return 0;
714 }
715
716 static inline int get_qscale(MpegEncContext *s)
717 {
718     int qscale = get_bits(&s->gb, 5);
719     if (s->q_scale_type)
720         return non_linear_qscale[qscale];
721     else
722         return qscale << 1;
723 }
724
725
726 /* motion type (for MPEG-2) */
727 #define MT_FIELD 1
728 #define MT_FRAME 2
729 #define MT_16X8  2
730 #define MT_DMV   3
731
732 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
733 {
734     int i, j, k, cbp, val, mb_type, motion_type;
735     const int mb_block_count = 4 + (1 << s->chroma_format);
736
737     av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
738
739     av_assert2(s->mb_skipped == 0);
740
741     if (s->mb_skip_run-- != 0) {
742         if (s->pict_type == AV_PICTURE_TYPE_P) {
743             s->mb_skipped = 1;
744             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
745                 MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
746         } else {
747             int mb_type;
748
749             if (s->mb_x)
750                 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
751             else
752                 // FIXME not sure if this is allowed in MPEG at all
753                 mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
754             if (IS_INTRA(mb_type)) {
755                 av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
756                 return -1;
757             }
758             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
759                 mb_type | MB_TYPE_SKIP;
760
761             if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
762                 s->mb_skipped = 1;
763         }
764
765         return 0;
766     }
767
768     switch (s->pict_type) {
769     default:
770     case AV_PICTURE_TYPE_I:
771         if (get_bits1(&s->gb) == 0) {
772             if (get_bits1(&s->gb) == 0) {
773                 av_log(s->avctx, AV_LOG_ERROR,
774                        "invalid mb type in I Frame at %d %d\n",
775                        s->mb_x, s->mb_y);
776                 return -1;
777             }
778             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
779         } else {
780             mb_type = MB_TYPE_INTRA;
781         }
782         break;
783     case AV_PICTURE_TYPE_P:
784         mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
785         if (mb_type < 0) {
786             av_log(s->avctx, AV_LOG_ERROR,
787                    "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
788             return -1;
789         }
790         mb_type = ptype2mb_type[mb_type];
791         break;
792     case AV_PICTURE_TYPE_B:
793         mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
794         if (mb_type < 0) {
795             av_log(s->avctx, AV_LOG_ERROR,
796                    "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
797             return -1;
798         }
799         mb_type = btype2mb_type[mb_type];
800         break;
801     }
802     av_dlog(s->avctx, "mb_type=%x\n", mb_type);
803 //    motion_type = 0; /* avoid warning */
804     if (IS_INTRA(mb_type)) {
805         s->bdsp.clear_blocks(s->block[0]);
806
807         if (!s->chroma_y_shift)
808             s->bdsp.clear_blocks(s->block[6]);
809
810         /* compute DCT type */
811         // FIXME: add an interlaced_dct coded var?
812         if (s->picture_structure == PICT_FRAME &&
813             !s->frame_pred_frame_dct)
814             s->interlaced_dct = get_bits1(&s->gb);
815
816         if (IS_QUANT(mb_type))
817             s->qscale = get_qscale(s);
818
819         if (s->concealment_motion_vectors) {
820             /* just parse them */
821             if (s->picture_structure != PICT_FRAME)
822                 skip_bits1(&s->gb);  /* field select */
823
824             s->mv[0][0][0]      =
825             s->last_mv[0][0][0] =
826             s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
827                                                      s->last_mv[0][0][0]);
828             s->mv[0][0][1]      =
829             s->last_mv[0][0][1] =
830             s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
831                                                      s->last_mv[0][0][1]);
832
833             skip_bits1(&s->gb); /* marker */
834         } else {
835             /* reset mv prediction */
836             memset(s->last_mv, 0, sizeof(s->last_mv));
837         }
838         s->mb_intra = 1;
839         // if 1, we memcpy blocks in xvmcvideo
840         if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
841             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
842
843         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
844             if (s->flags2 & CODEC_FLAG2_FAST) {
845                 for (i = 0; i < 6; i++)
846                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
847             } else {
848                 for (i = 0; i < mb_block_count; i++)
849                     if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
850                         return -1;
851             }
852         } else {
853             for (i = 0; i < 6; i++)
854                 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
855                     return -1;
856         }
857     } else {
858         if (mb_type & MB_TYPE_ZERO_MV) {
859             av_assert2(mb_type & MB_TYPE_CBP);
860
861             s->mv_dir = MV_DIR_FORWARD;
862             if (s->picture_structure == PICT_FRAME) {
863                 if (s->picture_structure == PICT_FRAME
864                     && !s->frame_pred_frame_dct)
865                     s->interlaced_dct = get_bits1(&s->gb);
866                 s->mv_type = MV_TYPE_16X16;
867             } else {
868                 s->mv_type            = MV_TYPE_FIELD;
869                 mb_type              |= MB_TYPE_INTERLACED;
870                 s->field_select[0][0] = s->picture_structure - 1;
871             }
872
873             if (IS_QUANT(mb_type))
874                 s->qscale = get_qscale(s);
875
876             s->last_mv[0][0][0] = 0;
877             s->last_mv[0][0][1] = 0;
878             s->last_mv[0][1][0] = 0;
879             s->last_mv[0][1][1] = 0;
880             s->mv[0][0][0]      = 0;
881             s->mv[0][0][1]      = 0;
882         } else {
883             av_assert2(mb_type & MB_TYPE_L0L1);
884             // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
885             /* get additional motion vector type */
886             if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
887                 motion_type = MT_FRAME;
888             } else {
889                 motion_type = get_bits(&s->gb, 2);
890                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
891                     s->interlaced_dct = get_bits1(&s->gb);
892             }
893
894             if (IS_QUANT(mb_type))
895                 s->qscale = get_qscale(s);
896
897             /* motion vectors */
898             s->mv_dir = (mb_type >> 13) & 3;
899             av_dlog(s->avctx, "motion_type=%d\n", motion_type);
900             switch (motion_type) {
901             case MT_FRAME: /* or MT_16X8 */
902                 if (s->picture_structure == PICT_FRAME) {
903                     mb_type   |= MB_TYPE_16x16;
904                     s->mv_type = MV_TYPE_16X16;
905                     for (i = 0; i < 2; i++) {
906                         if (USES_LIST(mb_type, i)) {
907                             /* MT_FRAME */
908                             s->mv[i][0][0]      =
909                             s->last_mv[i][0][0] =
910                             s->last_mv[i][1][0] =
911                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0],
912                                                    s->last_mv[i][0][0]);
913                             s->mv[i][0][1]      =
914                             s->last_mv[i][0][1] =
915                             s->last_mv[i][1][1] =
916                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1],
917                                                    s->last_mv[i][0][1]);
918                             /* full_pel: only for MPEG-1 */
919                             if (s->full_pel[i]) {
920                                 s->mv[i][0][0] <<= 1;
921                                 s->mv[i][0][1] <<= 1;
922                             }
923                         }
924                     }
925                 } else {
926                     mb_type   |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
927                     s->mv_type = MV_TYPE_16X8;
928                     for (i = 0; i < 2; i++) {
929                         if (USES_LIST(mb_type, i)) {
930                             /* MT_16X8 */
931                             for (j = 0; j < 2; j++) {
932                                 s->field_select[i][j] = get_bits1(&s->gb);
933                                 for (k = 0; k < 2; k++) {
934                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
935                                                              s->last_mv[i][j][k]);
936                                     s->last_mv[i][j][k] = val;
937                                     s->mv[i][j][k]      = val;
938                                 }
939                             }
940                         }
941                     }
942                 }
943                 break;
944             case MT_FIELD:
945                 s->mv_type = MV_TYPE_FIELD;
946                 if (s->picture_structure == PICT_FRAME) {
947                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
948                     for (i = 0; i < 2; i++) {
949                         if (USES_LIST(mb_type, i)) {
950                             for (j = 0; j < 2; j++) {
951                                 s->field_select[i][j] = get_bits1(&s->gb);
952                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
953                                                          s->last_mv[i][j][0]);
954                                 s->last_mv[i][j][0] = val;
955                                 s->mv[i][j][0]      = val;
956                                 av_dlog(s->avctx, "fmx=%d\n", val);
957                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
958                                                          s->last_mv[i][j][1] >> 1);
959                                 s->last_mv[i][j][1] = val << 1;
960                                 s->mv[i][j][1]      = val;
961                                 av_dlog(s->avctx, "fmy=%d\n", val);
962                             }
963                         }
964                     }
965                 } else {
966                     av_assert0(!s->progressive_sequence);
967                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
968                     for (i = 0; i < 2; i++) {
969                         if (USES_LIST(mb_type, i)) {
970                             s->field_select[i][0] = get_bits1(&s->gb);
971                             for (k = 0; k < 2; k++) {
972                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
973                                                          s->last_mv[i][0][k]);
974                                 s->last_mv[i][0][k] = val;
975                                 s->last_mv[i][1][k] = val;
976                                 s->mv[i][0][k]      = val;
977                             }
978                         }
979                     }
980                 }
981                 break;
982             case MT_DMV:
983                 if (s->progressive_sequence){
984                     av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
985                     return -1;
986                 }
987                 s->mv_type = MV_TYPE_DMV;
988                 for (i = 0; i < 2; i++) {
989                     if (USES_LIST(mb_type, i)) {
990                         int dmx, dmy, mx, my, m;
991                         const int my_shift = s->picture_structure == PICT_FRAME;
992
993                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
994                                                 s->last_mv[i][0][0]);
995                         s->last_mv[i][0][0] = mx;
996                         s->last_mv[i][1][0] = mx;
997                         dmx = get_dmv(s);
998                         my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
999                                                  s->last_mv[i][0][1] >> my_shift);
1000                         dmy = get_dmv(s);
1001
1002
1003                         s->last_mv[i][0][1] = my << my_shift;
1004                         s->last_mv[i][1][1] = my << my_shift;
1005
1006                         s->mv[i][0][0] = mx;
1007                         s->mv[i][0][1] = my;
1008                         s->mv[i][1][0] = mx; // not used
1009                         s->mv[i][1][1] = my; // not used
1010
1011                         if (s->picture_structure == PICT_FRAME) {
1012                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1013
1014                             // m = 1 + 2 * s->top_field_first;
1015                             m = s->top_field_first ? 1 : 3;
1016
1017                             /* top -> top pred */
1018                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1019                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1020                             m = 4 - m;
1021                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1022                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1023                         } else {
1024                             mb_type |= MB_TYPE_16x16;
1025
1026                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1027                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1028                             if (s->picture_structure == PICT_TOP_FIELD)
1029                                 s->mv[i][2][1]--;
1030                             else
1031                                 s->mv[i][2][1]++;
1032                         }
1033                     }
1034                 }
1035                 break;
1036             default:
1037                 av_log(s->avctx, AV_LOG_ERROR,
1038                        "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1039                 return -1;
1040             }
1041         }
1042
1043         s->mb_intra = 0;
1044         if (HAS_CBP(mb_type)) {
1045             s->bdsp.clear_blocks(s->block[0]);
1046
1047             cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1048             if (mb_block_count > 6) {
1049                 cbp <<= mb_block_count - 6;
1050                 cbp  |= get_bits(&s->gb, mb_block_count - 6);
1051                 s->bdsp.clear_blocks(s->block[6]);
1052             }
1053             if (cbp <= 0) {
1054                 av_log(s->avctx, AV_LOG_ERROR,
1055                        "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
1056                 return -1;
1057             }
1058
1059             // if 1, we memcpy blocks in xvmcvideo
1060             if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1061                 ff_xvmc_pack_pblocks(s, cbp);
1062
1063             if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1064                 if (s->flags2 & CODEC_FLAG2_FAST) {
1065                     for (i = 0; i < 6; i++) {
1066                         if (cbp & 32)
1067                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1068                         else
1069                             s->block_last_index[i] = -1;
1070                         cbp += cbp;
1071                     }
1072                 } else {
1073                     cbp <<= 12 - mb_block_count;
1074
1075                     for (i = 0; i < mb_block_count; i++) {
1076                         if (cbp & (1 << 11)) {
1077                             if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
1078                                 return -1;
1079                         } else {
1080                             s->block_last_index[i] = -1;
1081                         }
1082                         cbp += cbp;
1083                     }
1084                 }
1085             } else {
1086                 if (s->flags2 & CODEC_FLAG2_FAST) {
1087                     for (i = 0; i < 6; i++) {
1088                         if (cbp & 32)
1089                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1090                         else
1091                             s->block_last_index[i] = -1;
1092                         cbp += cbp;
1093                     }
1094                 } else {
1095                     for (i = 0; i < 6; i++) {
1096                         if (cbp & 32) {
1097                             if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
1098                                 return -1;
1099                         } else {
1100                             s->block_last_index[i] = -1;
1101                         }
1102                         cbp += cbp;
1103                     }
1104                 }
1105             }
1106         } else {
1107             for (i = 0; i < 12; i++)
1108                 s->block_last_index[i] = -1;
1109         }
1110     }
1111
1112     s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1113
1114     return 0;
1115 }
1116
1117 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1118 {
1119     Mpeg1Context *s    = avctx->priv_data;
1120     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1121
1122     ff_mpv_decode_defaults(s2);
1123
1124     s->mpeg_enc_ctx.avctx  = avctx;
1125     s->mpeg_enc_ctx.flags  = avctx->flags;
1126     s->mpeg_enc_ctx.flags2 = avctx->flags2;
1127
1128     /* we need some permutation to store matrices,
1129      * until the decoder sets the real permutation. */
1130     ff_mpv_idct_init(s2);
1131     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1132     ff_mpeg12_init_vlcs();
1133
1134     s->mpeg_enc_ctx_allocated      = 0;
1135     s->mpeg_enc_ctx.picture_number = 0;
1136     s->repeat_field                = 0;
1137     s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1138     avctx->color_range             = AVCOL_RANGE_MPEG;
1139     if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1140         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1141     else
1142         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1143     return 0;
1144 }
1145
1146 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1147                                              const AVCodecContext *avctx_from)
1148 {
1149     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1150     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1151     int err;
1152
1153     if (avctx == avctx_from               ||
1154         !ctx_from->mpeg_enc_ctx_allocated ||
1155         !s1->context_initialized)
1156         return 0;
1157
1158     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1159     if (err)
1160         return err;
1161
1162     if (!ctx->mpeg_enc_ctx_allocated)
1163         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1164
1165     if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1166         s->picture_number++;
1167
1168     return 0;
1169 }
1170
1171 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1172                                  const uint8_t *new_perm)
1173 {
1174     uint16_t temp_matrix[64];
1175     int i;
1176
1177     memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1178
1179     for (i = 0; i < 64; i++)
1180         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1181 }
1182
1183 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1184 #if CONFIG_MPEG1_XVMC_HWACCEL
1185     AV_PIX_FMT_XVMC,
1186 #endif
1187 #if CONFIG_MPEG1_VDPAU_HWACCEL
1188     AV_PIX_FMT_VDPAU_MPEG1,
1189     AV_PIX_FMT_VDPAU,
1190 #endif
1191     AV_PIX_FMT_YUV420P,
1192     AV_PIX_FMT_NONE
1193 };
1194
1195 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1196 #if CONFIG_MPEG2_XVMC_HWACCEL
1197     AV_PIX_FMT_XVMC,
1198 #endif
1199 #if CONFIG_MPEG2_VDPAU_HWACCEL
1200     AV_PIX_FMT_VDPAU_MPEG2,
1201     AV_PIX_FMT_VDPAU,
1202 #endif
1203 #if CONFIG_MPEG2_DXVA2_HWACCEL
1204     AV_PIX_FMT_DXVA2_VLD,
1205 #endif
1206 #if CONFIG_MPEG2_VAAPI_HWACCEL
1207     AV_PIX_FMT_VAAPI_VLD,
1208 #endif
1209     AV_PIX_FMT_YUV420P,
1210     AV_PIX_FMT_NONE
1211 };
1212
1213 static inline int uses_vdpau(AVCodecContext *avctx) {
1214     return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1215 }
1216
1217 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1218 {
1219     Mpeg1Context *s1  = avctx->priv_data;
1220     MpegEncContext *s = &s1->mpeg_enc_ctx;
1221
1222     if (s->chroma_format < 2)
1223         return ff_thread_get_format(avctx,
1224                                 avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1225                                 mpeg1_hwaccel_pixfmt_list_420 :
1226                                 mpeg2_hwaccel_pixfmt_list_420);
1227     else if (s->chroma_format == 2)
1228         return AV_PIX_FMT_YUV422P;
1229     else
1230         return AV_PIX_FMT_YUV444P;
1231 }
1232
1233 static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1234 {
1235     // until then pix_fmt may be changed right after codec init
1236     if (avctx->hwaccel || uses_vdpau(avctx))
1237         if (avctx->idct_algo == FF_IDCT_AUTO)
1238             avctx->idct_algo = FF_IDCT_SIMPLE;
1239
1240     if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1241         Mpeg1Context *s1 = avctx->priv_data;
1242         MpegEncContext *s = &s1->mpeg_enc_ctx;
1243
1244         s->pack_pblocks = 1;
1245 #if FF_API_XVMC
1246         avctx->xvmc_acceleration = 2;
1247 #endif /* FF_API_XVMC */
1248     }
1249 }
1250
1251 /* Call this function when we know all parameters.
1252  * It may be called in different places for MPEG-1 and MPEG-2. */
1253 static int mpeg_decode_postinit(AVCodecContext *avctx)
1254 {
1255     Mpeg1Context *s1  = avctx->priv_data;
1256     MpegEncContext *s = &s1->mpeg_enc_ctx;
1257     uint8_t old_permutation[64];
1258     int ret;
1259
1260     if ((s1->mpeg_enc_ctx_allocated == 0)                   ||
1261         avctx->coded_width       != s->width                ||
1262         avctx->coded_height      != s->height               ||
1263         s1->save_width           != s->width                ||
1264         s1->save_height          != s->height               ||
1265         s1->save_aspect_info     != s->aspect_ratio_info    ||
1266         (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1267         0) {
1268         if (s1->mpeg_enc_ctx_allocated) {
1269             ParseContext pc = s->parse_context;
1270             s->parse_context.buffer = 0;
1271             ff_mpv_common_end(s);
1272             s->parse_context = pc;
1273             s1->mpeg_enc_ctx_allocated = 0;
1274         }
1275
1276         if ((s->width == 0) || (s->height == 0))
1277             return -2;
1278
1279         ret = ff_set_dimensions(avctx, s->width, s->height);
1280         if (ret < 0)
1281             return ret;
1282
1283         if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1284             avctx->rc_max_rate = s->bit_rate;
1285         } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1286                    (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1287             avctx->bit_rate = s->bit_rate;
1288         }
1289         s1->save_aspect_info     = s->aspect_ratio_info;
1290         s1->save_width           = s->width;
1291         s1->save_height          = s->height;
1292         s1->save_progressive_seq = s->progressive_sequence;
1293
1294         /* low_delay may be forced, in this case we will have B-frames
1295          * that behave like P-frames. */
1296         avctx->has_b_frames = !s->low_delay;
1297
1298         if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1299             // MPEG-1 fps
1300             avctx->time_base.den = ff_mpeg12_frame_rate_tab[s->frame_rate_index].num;
1301             avctx->time_base.num = ff_mpeg12_frame_rate_tab[s->frame_rate_index].den;
1302             // MPEG-1 aspect
1303             avctx->sample_aspect_ratio = av_d2q(1.0 / ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1304             avctx->ticks_per_frame     = 1;
1305         } else { // MPEG-2
1306             // MPEG-2 fps
1307             av_reduce(&s->avctx->time_base.den,
1308                       &s->avctx->time_base.num,
1309                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num * 2,
1310                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1311                       1 << 30);
1312             avctx->ticks_per_frame = 2;
1313             // MPEG-2 aspect
1314             if (s->aspect_ratio_info > 1) {
1315                 AVRational dar =
1316                     av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1317                                       (AVRational) { s1->pan_scan.width,
1318                                                      s1->pan_scan.height }),
1319                              (AVRational) { s->width, s->height });
1320
1321                 /* We ignore the spec here and guess a bit as reality does not
1322                  * match the spec, see for example res_change_ffmpeg_aspect.ts
1323                  * and sequence-display-aspect.mpg.
1324                  * issue1613, 621, 562 */
1325                 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1326                     (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1327                      av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1328                     s->avctx->sample_aspect_ratio =
1329                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1330                                  (AVRational) { s->width, s->height });
1331                 } else {
1332                     s->avctx->sample_aspect_ratio =
1333                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1334                                  (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1335 // issue1613 4/3 16/9 -> 16/9
1336 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1337 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1338 //                    s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1339                     av_dlog(avctx, "A %d/%d\n",
1340                             ff_mpeg2_aspect[s->aspect_ratio_info].num,
1341                             ff_mpeg2_aspect[s->aspect_ratio_info].den);
1342                     av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1343                             s->avctx->sample_aspect_ratio.den);
1344                 }
1345             } else {
1346                 s->avctx->sample_aspect_ratio =
1347                     ff_mpeg2_aspect[s->aspect_ratio_info];
1348             }
1349         } // MPEG-2
1350
1351         ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
1352
1353         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1354         setup_hwaccel_for_pixfmt(avctx);
1355
1356         /* Quantization matrices may need reordering
1357          * if DCT permutation is changed. */
1358         memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1359
1360         ff_mpv_idct_init(s);
1361         if (ff_mpv_common_init(s) < 0)
1362             return -2;
1363
1364         quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->idsp.idct_permutation);
1365         quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->idsp.idct_permutation);
1366         quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1367         quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1368
1369         s1->mpeg_enc_ctx_allocated = 1;
1370     }
1371     return 0;
1372 }
1373
1374 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1375                                 int buf_size)
1376 {
1377     Mpeg1Context *s1  = avctx->priv_data;
1378     MpegEncContext *s = &s1->mpeg_enc_ctx;
1379     int ref, f_code, vbv_delay;
1380
1381     init_get_bits(&s->gb, buf, buf_size * 8);
1382
1383     ref = get_bits(&s->gb, 10); /* temporal ref */
1384     s->pict_type = get_bits(&s->gb, 3);
1385     if (s->pict_type == 0 || s->pict_type > 3)
1386         return -1;
1387
1388     vbv_delay = get_bits(&s->gb, 16);
1389     s->vbv_delay = vbv_delay;
1390     if (s->pict_type == AV_PICTURE_TYPE_P ||
1391         s->pict_type == AV_PICTURE_TYPE_B) {
1392         s->full_pel[0] = get_bits1(&s->gb);
1393         f_code = get_bits(&s->gb, 3);
1394         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1395             return -1;
1396         f_code += !f_code;
1397         s->mpeg_f_code[0][0] = f_code;
1398         s->mpeg_f_code[0][1] = f_code;
1399     }
1400     if (s->pict_type == AV_PICTURE_TYPE_B) {
1401         s->full_pel[1] = get_bits1(&s->gb);
1402         f_code = get_bits(&s->gb, 3);
1403         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1404             return -1;
1405         f_code += !f_code;
1406         s->mpeg_f_code[1][0] = f_code;
1407         s->mpeg_f_code[1][1] = f_code;
1408     }
1409     s->current_picture.f->pict_type = s->pict_type;
1410     s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1411
1412     if (avctx->debug & FF_DEBUG_PICT_INFO)
1413         av_log(avctx, AV_LOG_DEBUG,
1414                "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1415
1416     s->y_dc_scale = 8;
1417     s->c_dc_scale = 8;
1418     return 0;
1419 }
1420
1421 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1422 {
1423     MpegEncContext *s = &s1->mpeg_enc_ctx;
1424     int horiz_size_ext, vert_size_ext;
1425     int bit_rate_ext;
1426
1427     skip_bits(&s->gb, 1); /* profile and level esc*/
1428     s->avctx->profile       = get_bits(&s->gb, 3);
1429     s->avctx->level         = get_bits(&s->gb, 4);
1430     s->progressive_sequence = get_bits1(&s->gb);   /* progressive_sequence */
1431     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1432     horiz_size_ext          = get_bits(&s->gb, 2);
1433     vert_size_ext           = get_bits(&s->gb, 2);
1434     s->width  |= (horiz_size_ext << 12);
1435     s->height |= (vert_size_ext  << 12);
1436     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1437     s->bit_rate += (bit_rate_ext << 18) * 400;
1438     skip_bits1(&s->gb); /* marker */
1439     s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1440
1441     s->low_delay = get_bits1(&s->gb);
1442     if (s->flags & CODEC_FLAG_LOW_DELAY)
1443         s->low_delay = 1;
1444
1445     s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1446     s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1447
1448     av_dlog(s->avctx, "sequence extension\n");
1449     s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1450
1451     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1452         av_log(s->avctx, AV_LOG_DEBUG,
1453                "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%d\n",
1454                s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1455                s->avctx->rc_buffer_size, s->bit_rate);
1456 }
1457
1458 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1459 {
1460     MpegEncContext *s = &s1->mpeg_enc_ctx;
1461     int color_description, w, h;
1462
1463     skip_bits(&s->gb, 3); /* video format */
1464     color_description = get_bits1(&s->gb);
1465     if (color_description) {
1466         s->avctx->color_primaries = get_bits(&s->gb, 8);
1467         s->avctx->color_trc       = get_bits(&s->gb, 8);
1468         s->avctx->colorspace      = get_bits(&s->gb, 8);
1469     }
1470     w = get_bits(&s->gb, 14);
1471     skip_bits(&s->gb, 1); // marker
1472     h = get_bits(&s->gb, 14);
1473     // remaining 3 bits are zero padding
1474
1475     s1->pan_scan.width  = 16 * w;
1476     s1->pan_scan.height = 16 * h;
1477
1478     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1479         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1480 }
1481
1482 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1483 {
1484     MpegEncContext *s = &s1->mpeg_enc_ctx;
1485     int i, nofco;
1486
1487     nofco = 1;
1488     if (s->progressive_sequence) {
1489         if (s->repeat_first_field) {
1490             nofco++;
1491             if (s->top_field_first)
1492                 nofco++;
1493         }
1494     } else {
1495         if (s->picture_structure == PICT_FRAME) {
1496             nofco++;
1497             if (s->repeat_first_field)
1498                 nofco++;
1499         }
1500     }
1501     for (i = 0; i < nofco; i++) {
1502         s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1503         skip_bits(&s->gb, 1); // marker
1504         s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1505         skip_bits(&s->gb, 1); // marker
1506     }
1507
1508     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1509         av_log(s->avctx, AV_LOG_DEBUG,
1510                "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1511                s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1512                s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1513                s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1514 }
1515
1516 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1517                        uint16_t matrix1[64], int intra)
1518 {
1519     int i;
1520
1521     for (i = 0; i < 64; i++) {
1522         int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1523         int v = get_bits(&s->gb, 8);
1524         if (v == 0) {
1525             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1526             return -1;
1527         }
1528         if (intra && i == 0 && v != 8) {
1529             av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1530             v = 8; // needed by pink.mpg / issue1046
1531         }
1532         matrix0[j] = v;
1533         if (matrix1)
1534             matrix1[j] = v;
1535     }
1536     return 0;
1537 }
1538
1539 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1540 {
1541     av_dlog(s->avctx, "matrix extension\n");
1542
1543     if (get_bits1(&s->gb))
1544         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1545     if (get_bits1(&s->gb))
1546         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1547     if (get_bits1(&s->gb))
1548         load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1549     if (get_bits1(&s->gb))
1550         load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1551 }
1552
1553 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1554 {
1555     MpegEncContext *s = &s1->mpeg_enc_ctx;
1556
1557     s->full_pel[0]       = s->full_pel[1] = 0;
1558     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1559     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1560     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1561     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1562     if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1563         av_log(s->avctx, AV_LOG_ERROR,
1564                "Missing picture start code, guessing missing values\n");
1565         if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1566             if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1567                 s->pict_type = AV_PICTURE_TYPE_I;
1568             else
1569                 s->pict_type = AV_PICTURE_TYPE_P;
1570         } else
1571             s->pict_type = AV_PICTURE_TYPE_B;
1572         s->current_picture.f->pict_type = s->pict_type;
1573         s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1574     }
1575     s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1576     s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1577     s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1578     s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1579
1580     s->intra_dc_precision         = get_bits(&s->gb, 2);
1581     s->picture_structure          = get_bits(&s->gb, 2);
1582     s->top_field_first            = get_bits1(&s->gb);
1583     s->frame_pred_frame_dct       = get_bits1(&s->gb);
1584     s->concealment_motion_vectors = get_bits1(&s->gb);
1585     s->q_scale_type               = get_bits1(&s->gb);
1586     s->intra_vlc_format           = get_bits1(&s->gb);
1587     s->alternate_scan             = get_bits1(&s->gb);
1588     s->repeat_first_field         = get_bits1(&s->gb);
1589     s->chroma_420_type            = get_bits1(&s->gb);
1590     s->progressive_frame          = get_bits1(&s->gb);
1591
1592     if (s->alternate_scan) {
1593         ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1594         ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1595     } else {
1596         ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1597         ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1598     }
1599
1600     /* composite display not parsed */
1601     av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1602     av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1603     av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1604     av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1605     av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1606     av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1607     av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1608     av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1609     av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1610 }
1611
1612 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1613 {
1614     AVCodecContext *avctx = s->avctx;
1615     Mpeg1Context *s1      = (Mpeg1Context *) s;
1616
1617     /* start frame decoding */
1618     if (s->first_field || s->picture_structure == PICT_FRAME) {
1619         AVFrameSideData *pan_scan;
1620
1621         if (ff_mpv_frame_start(s, avctx) < 0)
1622             return -1;
1623
1624         ff_mpeg_er_frame_start(s);
1625
1626         /* first check if we must repeat the frame */
1627         s->current_picture_ptr->f->repeat_pict = 0;
1628         if (s->repeat_first_field) {
1629             if (s->progressive_sequence) {
1630                 if (s->top_field_first)
1631                     s->current_picture_ptr->f->repeat_pict = 4;
1632                 else
1633                     s->current_picture_ptr->f->repeat_pict = 2;
1634             } else if (s->progressive_frame) {
1635                 s->current_picture_ptr->f->repeat_pict = 1;
1636             }
1637         }
1638
1639         pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1640                                           AV_FRAME_DATA_PANSCAN,
1641                                           sizeof(s1->pan_scan));
1642         if (!pan_scan)
1643             return AVERROR(ENOMEM);
1644         memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1645
1646         if (s1->a53_caption) {
1647             AVFrameSideData *sd = av_frame_new_side_data(
1648                 s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1649                 s1->a53_caption_size);
1650             if (sd)
1651                 memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1652             av_freep(&s1->a53_caption);
1653         }
1654
1655         if (s1->has_stereo3d) {
1656             AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1657             if (!stereo)
1658                 return AVERROR(ENOMEM);
1659
1660             *stereo = s1->stereo3d;
1661             s1->has_stereo3d = 0;
1662         }
1663
1664         if (s1->has_afd) {
1665             AVFrameSideData *sd =
1666                 av_frame_new_side_data(s->current_picture_ptr->f,
1667                                        AV_FRAME_DATA_AFD, 1);
1668             if (!sd)
1669                 return AVERROR(ENOMEM);
1670
1671             *sd->data   = s1->afd;
1672             s1->has_afd = 0;
1673         }
1674
1675         if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1676             ff_thread_finish_setup(avctx);
1677     } else { // second field
1678         int i;
1679
1680         if (!s->current_picture_ptr) {
1681             av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1682             return -1;
1683         }
1684
1685         if (s->avctx->hwaccel &&
1686             (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1687             if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1688                 av_log(avctx, AV_LOG_ERROR,
1689                        "hardware accelerator failed to decode first field\n");
1690         }
1691
1692         for (i = 0; i < 4; i++) {
1693             s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1694             if (s->picture_structure == PICT_BOTTOM_FIELD)
1695                 s->current_picture.f->data[i] +=
1696                     s->current_picture_ptr->f->linesize[i];
1697         }
1698     }
1699
1700     if (avctx->hwaccel) {
1701         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1702             return -1;
1703     }
1704
1705     return 0;
1706 }
1707
1708 #define DECODE_SLICE_ERROR -1
1709 #define DECODE_SLICE_OK     0
1710
1711 /**
1712  * Decode a slice.
1713  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1714  * @return DECODE_SLICE_ERROR if the slice is damaged,
1715  *         DECODE_SLICE_OK if this slice is OK
1716  */
1717 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1718                              const uint8_t **buf, int buf_size)
1719 {
1720     AVCodecContext *avctx = s->avctx;
1721     const int lowres      = s->avctx->lowres;
1722     const int field_pic   = s->picture_structure != PICT_FRAME;
1723
1724     s->resync_mb_x =
1725     s->resync_mb_y = -1;
1726
1727     av_assert0(mb_y < s->mb_height);
1728
1729     init_get_bits(&s->gb, *buf, buf_size * 8);
1730     if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1731         skip_bits(&s->gb, 3);
1732
1733     ff_mpeg1_clean_buffers(s);
1734     s->interlaced_dct = 0;
1735
1736     s->qscale = get_qscale(s);
1737
1738     if (s->qscale == 0) {
1739         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1740         return -1;
1741     }
1742
1743     /* extra slice info */
1744     if (skip_1stop_8data_bits(&s->gb) < 0)
1745         return AVERROR_INVALIDDATA;
1746
1747     s->mb_x = 0;
1748
1749     if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1750         skip_bits1(&s->gb);
1751     } else {
1752         while (get_bits_left(&s->gb) > 0) {
1753             int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1754                                 MBINCR_VLC_BITS, 2);
1755             if (code < 0) {
1756                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1757                 return -1;
1758             }
1759             if (code >= 33) {
1760                 if (code == 33)
1761                     s->mb_x += 33;
1762                 /* otherwise, stuffing, nothing to do */
1763             } else {
1764                 s->mb_x += code;
1765                 break;
1766             }
1767         }
1768     }
1769
1770     if (s->mb_x >= (unsigned) s->mb_width) {
1771         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1772         return -1;
1773     }
1774
1775     if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1776         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1777         int start_code = -1;
1778         buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1779         if (buf_end < *buf + buf_size)
1780             buf_end -= 4;
1781         s->mb_y = mb_y;
1782         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1783             return DECODE_SLICE_ERROR;
1784         *buf = buf_end;
1785         return DECODE_SLICE_OK;
1786     }
1787
1788     s->resync_mb_x = s->mb_x;
1789     s->resync_mb_y = s->mb_y = mb_y;
1790     s->mb_skip_run = 0;
1791     ff_init_block_index(s);
1792
1793     if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1794         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1795             av_log(s->avctx, AV_LOG_DEBUG,
1796                    "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",
1797                    s->qscale,
1798                    s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1799                    s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1800                    s->pict_type  == AV_PICTURE_TYPE_I ? "I" :
1801                    (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1802                    (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1803                    s->progressive_sequence ? "ps"  : "",
1804                    s->progressive_frame    ? "pf"  : "",
1805                    s->alternate_scan       ? "alt" : "",
1806                    s->top_field_first      ? "top" : "",
1807                    s->intra_dc_precision, s->picture_structure,
1808                    s->frame_pred_frame_dct, s->concealment_motion_vectors,
1809                    s->q_scale_type, s->intra_vlc_format,
1810                    s->repeat_first_field, s->chroma_420_type ? "420" : "");
1811         }
1812     }
1813
1814     for (;;) {
1815         // If 1, we memcpy blocks in xvmcvideo.
1816         if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1817             ff_xvmc_init_block(s); // set s->block
1818
1819         if (mpeg_decode_mb(s, s->block) < 0)
1820             return -1;
1821
1822         // Note motion_val is normally NULL unless we want to extract the MVs.
1823         if (s->current_picture.motion_val[0] && !s->encoding) {
1824             const int wrap = s->b8_stride;
1825             int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1826             int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1827             int motion_x, motion_y, dir, i;
1828
1829             for (i = 0; i < 2; i++) {
1830                 for (dir = 0; dir < 2; dir++) {
1831                     if (s->mb_intra ||
1832                         (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1833                         motion_x = motion_y = 0;
1834                     } else if (s->mv_type == MV_TYPE_16X16 ||
1835                                (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1836                         motion_x = s->mv[dir][0][0];
1837                         motion_y = s->mv[dir][0][1];
1838                     } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1839                         motion_x = s->mv[dir][i][0];
1840                         motion_y = s->mv[dir][i][1];
1841                     }
1842
1843                     s->current_picture.motion_val[dir][xy][0]     = motion_x;
1844                     s->current_picture.motion_val[dir][xy][1]     = motion_y;
1845                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1846                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1847                     s->current_picture.ref_index [dir][b8_xy]     =
1848                     s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1849                     av_assert2(s->field_select[dir][i] == 0 ||
1850                                s->field_select[dir][i] == 1);
1851                 }
1852                 xy    += wrap;
1853                 b8_xy += 2;
1854             }
1855         }
1856
1857         s->dest[0] += 16 >> lowres;
1858         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1859         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1860
1861         ff_mpv_decode_mb(s, s->block);
1862
1863         if (++s->mb_x >= s->mb_width) {
1864             const int mb_size = 16 >> s->avctx->lowres;
1865
1866             ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1867             ff_mpv_report_decode_progress(s);
1868
1869             s->mb_x  = 0;
1870             s->mb_y += 1 << field_pic;
1871
1872             if (s->mb_y >= s->mb_height) {
1873                 int left   = get_bits_left(&s->gb);
1874                 int is_d10 = s->chroma_format == 2 &&
1875                              s->pict_type == AV_PICTURE_TYPE_I &&
1876                              avctx->profile == 0 && avctx->level == 5 &&
1877                              s->intra_dc_precision == 2 &&
1878                              s->q_scale_type == 1 && s->alternate_scan == 0 &&
1879                              s->progressive_frame == 0
1880                              /* vbv_delay == 0xBBB || 0xE10 */;
1881
1882                 if (left >= 32 && !is_d10) {
1883                     GetBitContext gb = s->gb;
1884                     align_get_bits(&gb);
1885                     if (show_bits(&gb, 24) == 0x060E2B) {
1886                         av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1887                         is_d10 = 1;
1888                     }
1889                 }
1890
1891                 if (left < 0 ||
1892                     (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1893                     ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1894                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
1895                            left, show_bits(&s->gb, FFMIN(left, 23)));
1896                     return -1;
1897                 } else
1898                     goto eos;
1899             }
1900             // There are some files out there which are missing the last slice
1901             // in cases where the slice is completely outside the visible
1902             // area, we detect this here instead of running into the end expecting
1903             // more data
1904             if (s->mb_y >= ((s->height + 15) >> 4) &&
1905                 s->progressive_frame &&
1906                 !s->progressive_sequence &&
1907                 get_bits_left(&s->gb) <= 8 &&
1908                 get_bits_left(&s->gb) >= 0 &&
1909                 s->mb_skip_run == -1 &&
1910                 show_bits(&s->gb, 8) == 0)
1911                 goto eos;
1912
1913             ff_init_block_index(s);
1914         }
1915
1916         /* skip mb handling */
1917         if (s->mb_skip_run == -1) {
1918             /* read increment again */
1919             s->mb_skip_run = 0;
1920             for (;;) {
1921                 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1922                                     MBINCR_VLC_BITS, 2);
1923                 if (code < 0) {
1924                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1925                     return -1;
1926                 }
1927                 if (code >= 33) {
1928                     if (code == 33) {
1929                         s->mb_skip_run += 33;
1930                     } else if (code == 35) {
1931                         if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1932                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1933                             return -1;
1934                         }
1935                         goto eos; /* end of slice */
1936                     }
1937                     /* otherwise, stuffing, nothing to do */
1938                 } else {
1939                     s->mb_skip_run += code;
1940                     break;
1941                 }
1942             }
1943             if (s->mb_skip_run) {
1944                 int i;
1945                 if (s->pict_type == AV_PICTURE_TYPE_I) {
1946                     av_log(s->avctx, AV_LOG_ERROR,
1947                            "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1948                     return -1;
1949                 }
1950
1951                 /* skip mb */
1952                 s->mb_intra = 0;
1953                 for (i = 0; i < 12; i++)
1954                     s->block_last_index[i] = -1;
1955                 if (s->picture_structure == PICT_FRAME)
1956                     s->mv_type = MV_TYPE_16X16;
1957                 else
1958                     s->mv_type = MV_TYPE_FIELD;
1959                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1960                     /* if P type, zero motion vector is implied */
1961                     s->mv_dir             = MV_DIR_FORWARD;
1962                     s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1963                     s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1964                     s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1965                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1966                 } else {
1967                     /* if B type, reuse previous vectors and directions */
1968                     s->mv[0][0][0] = s->last_mv[0][0][0];
1969                     s->mv[0][0][1] = s->last_mv[0][0][1];
1970                     s->mv[1][0][0] = s->last_mv[1][0][0];
1971                     s->mv[1][0][1] = s->last_mv[1][0][1];
1972                 }
1973             }
1974         }
1975     }
1976 eos: // end of slice
1977     if (get_bits_left(&s->gb) < 0) {
1978         av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1979         return AVERROR_INVALIDDATA;
1980     }
1981     *buf += (get_bits_count(&s->gb) - 1) / 8;
1982     av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1983     return 0;
1984 }
1985
1986 static int slice_decode_thread(AVCodecContext *c, void *arg)
1987 {
1988     MpegEncContext *s   = *(void **) arg;
1989     const uint8_t *buf  = s->gb.buffer;
1990     int mb_y            = s->start_mb_y;
1991     const int field_pic = s->picture_structure != PICT_FRAME;
1992
1993     s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1994
1995     for (;;) {
1996         uint32_t start_code;
1997         int ret;
1998
1999         ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
2000         emms_c();
2001         av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2002                 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
2003                 s->start_mb_y, s->end_mb_y, s->er.error_count);
2004         if (ret < 0) {
2005             if (c->err_recognition & AV_EF_EXPLODE)
2006                 return ret;
2007             if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2008                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2009                                 s->mb_x, s->mb_y,
2010                                 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2011         } else {
2012             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2013                             s->mb_x - 1, s->mb_y,
2014                             ER_AC_END | ER_DC_END | ER_MV_END);
2015         }
2016
2017         if (s->mb_y == s->end_mb_y)
2018             return 0;
2019
2020         start_code = -1;
2021         buf        = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2022         mb_y       = start_code - SLICE_MIN_START_CODE;
2023         if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2024             mb_y += (*buf&0xE0)<<2;
2025         mb_y <<= field_pic;
2026         if (s->picture_structure == PICT_BOTTOM_FIELD)
2027             mb_y++;
2028         if (mb_y < 0 || mb_y >= s->end_mb_y)
2029             return -1;
2030     }
2031 }
2032
2033 /**
2034  * Handle slice ends.
2035  * @return 1 if it seems to be the last slice
2036  */
2037 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2038 {
2039     Mpeg1Context *s1  = avctx->priv_data;
2040     MpegEncContext *s = &s1->mpeg_enc_ctx;
2041
2042     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2043         return 0;
2044
2045     if (s->avctx->hwaccel) {
2046         if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
2047             av_log(avctx, AV_LOG_ERROR,
2048                    "hardware accelerator failed to decode picture\n");
2049     }
2050
2051     /* end of slice reached */
2052     if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2053         /* end of image */
2054
2055         ff_er_frame_end(&s->er);
2056
2057         ff_mpv_frame_end(s);
2058
2059         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2060             int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2061             if (ret < 0)
2062                 return ret;
2063             ff_print_debug_info(s, s->current_picture_ptr, pict);
2064             ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2065         } else {
2066             if (avctx->active_thread_type & FF_THREAD_FRAME)
2067                 s->picture_number++;
2068             /* latency of 1 frame for I- and P-frames */
2069             /* XXX: use another variable than picture_number */
2070             if (s->last_picture_ptr) {
2071                 int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2072                 if (ret < 0)
2073                     return ret;
2074                 ff_print_debug_info(s, s->last_picture_ptr, pict);
2075                 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2076             }
2077         }
2078
2079         return 1;
2080     } else {
2081         return 0;
2082     }
2083 }
2084
2085 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2086                                  const uint8_t *buf, int buf_size)
2087 {
2088     Mpeg1Context *s1  = avctx->priv_data;
2089     MpegEncContext *s = &s1->mpeg_enc_ctx;
2090     int width, height;
2091     int i, v, j;
2092
2093     init_get_bits(&s->gb, buf, buf_size * 8);
2094
2095     width  = get_bits(&s->gb, 12);
2096     height = get_bits(&s->gb, 12);
2097     if (width == 0 || height == 0) {
2098         av_log(avctx, AV_LOG_WARNING,
2099                "Invalid horizontal or vertical size value.\n");
2100         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2101             return AVERROR_INVALIDDATA;
2102     }
2103     s->aspect_ratio_info = get_bits(&s->gb, 4);
2104     if (s->aspect_ratio_info == 0) {
2105         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2106         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2107             return -1;
2108     }
2109     s->frame_rate_index = get_bits(&s->gb, 4);
2110     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2111         return -1;
2112     s->bit_rate = get_bits(&s->gb, 18) * 400;
2113     if (get_bits1(&s->gb) == 0) /* marker */
2114         return -1;
2115     s->width  = width;
2116     s->height = height;
2117
2118     s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2119     skip_bits(&s->gb, 1);
2120
2121     /* get matrix */
2122     if (get_bits1(&s->gb)) {
2123         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2124     } else {
2125         for (i = 0; i < 64; i++) {
2126             j = s->idsp.idct_permutation[i];
2127             v = ff_mpeg1_default_intra_matrix[i];
2128             s->intra_matrix[j]        = v;
2129             s->chroma_intra_matrix[j] = v;
2130         }
2131     }
2132     if (get_bits1(&s->gb)) {
2133         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2134     } else {
2135         for (i = 0; i < 64; i++) {
2136             int j = s->idsp.idct_permutation[i];
2137             v = ff_mpeg1_default_non_intra_matrix[i];
2138             s->inter_matrix[j]        = v;
2139             s->chroma_inter_matrix[j] = v;
2140         }
2141     }
2142
2143     if (show_bits(&s->gb, 23) != 0) {
2144         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2145         return -1;
2146     }
2147
2148     /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2149     s->progressive_sequence = 1;
2150     s->progressive_frame    = 1;
2151     s->picture_structure    = PICT_FRAME;
2152     s->first_field          = 0;
2153     s->frame_pred_frame_dct = 1;
2154     s->chroma_format        = 1;
2155     s->codec_id             =
2156     s->avctx->codec_id      = AV_CODEC_ID_MPEG1VIDEO;
2157     s->out_format           = FMT_MPEG1;
2158     s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2159     if (s->flags & CODEC_FLAG_LOW_DELAY)
2160         s->low_delay = 1;
2161
2162     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2163         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2164                s->avctx->rc_buffer_size, s->bit_rate);
2165
2166     return 0;
2167 }
2168
2169 static int vcr2_init_sequence(AVCodecContext *avctx)
2170 {
2171     Mpeg1Context *s1  = avctx->priv_data;
2172     MpegEncContext *s = &s1->mpeg_enc_ctx;
2173     int i, v;
2174
2175     /* start new MPEG-1 context decoding */
2176     s->out_format = FMT_MPEG1;
2177     if (s1->mpeg_enc_ctx_allocated) {
2178         ff_mpv_common_end(s);
2179         s1->mpeg_enc_ctx_allocated = 0;
2180     }
2181     s->width            = avctx->coded_width;
2182     s->height           = avctx->coded_height;
2183     avctx->has_b_frames = 0; // true?
2184     s->low_delay        = 1;
2185
2186     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2187     setup_hwaccel_for_pixfmt(avctx);
2188
2189     ff_mpv_idct_init(s);
2190     if (ff_mpv_common_init(s) < 0)
2191         return -1;
2192     s1->mpeg_enc_ctx_allocated = 1;
2193
2194     for (i = 0; i < 64; i++) {
2195         int j = s->idsp.idct_permutation[i];
2196         v = ff_mpeg1_default_intra_matrix[i];
2197         s->intra_matrix[j]        = v;
2198         s->chroma_intra_matrix[j] = v;
2199
2200         v = ff_mpeg1_default_non_intra_matrix[i];
2201         s->inter_matrix[j]        = v;
2202         s->chroma_inter_matrix[j] = v;
2203     }
2204
2205     s->progressive_sequence  = 1;
2206     s->progressive_frame     = 1;
2207     s->picture_structure     = PICT_FRAME;
2208     s->first_field           = 0;
2209     s->frame_pred_frame_dct  = 1;
2210     s->chroma_format         = 1;
2211     if (s->codec_tag == AV_RL32("BW10")) {
2212         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2213     } else {
2214         s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2215         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2216     }
2217     s1->save_width           = s->width;
2218     s1->save_height          = s->height;
2219     s1->save_progressive_seq = s->progressive_sequence;
2220     return 0;
2221 }
2222
2223 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2224                               const uint8_t *p, int buf_size)
2225 {
2226     Mpeg1Context *s1 = avctx->priv_data;
2227
2228     if (buf_size >= 6 &&
2229         p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2230         p[4] == 3 && (p[5] & 0x40)) {
2231         /* extract A53 Part 4 CC data */
2232         int cc_count = p[5] & 0x1f;
2233         if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2234             av_freep(&s1->a53_caption);
2235             s1->a53_caption_size = cc_count * 3;
2236             s1->a53_caption      = av_malloc(s1->a53_caption_size);
2237             if (s1->a53_caption)
2238                 memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2239         }
2240         return 1;
2241     } else if (buf_size >= 11 &&
2242                p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2243         /* extract DVD CC data */
2244         int cc_count = 0;
2245         int i;
2246         // There is a caption count field in the data, but it is often
2247         // incorect.  So count the number of captions present.
2248         for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2249             cc_count++;
2250         // Transform the DVD format into A53 Part 4 format
2251         if (cc_count > 0) {
2252             av_freep(&s1->a53_caption);
2253             s1->a53_caption_size = cc_count * 6;
2254             s1->a53_caption      = av_malloc(s1->a53_caption_size);
2255             if (s1->a53_caption) {
2256                 uint8_t field1 = !!(p[4] & 0x80);
2257                 uint8_t *cap = s1->a53_caption;
2258                 p += 5;
2259                 for (i = 0; i < cc_count; i++) {
2260                     cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2261                     cap[1] = p[1];
2262                     cap[2] = p[2];
2263                     cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2264                     cap[4] = p[4];
2265                     cap[5] = p[5];
2266                     cap += 6;
2267                     p += 6;
2268                 }
2269             }
2270         }
2271         return 1;
2272     }
2273     return 0;
2274 }
2275
2276 static void mpeg_decode_user_data(AVCodecContext *avctx,
2277                                   const uint8_t *p, int buf_size)
2278 {
2279     Mpeg1Context *s = avctx->priv_data;
2280     const uint8_t *buf_end = p + buf_size;
2281     Mpeg1Context *s1 = avctx->priv_data;
2282
2283     if (buf_size > 29){
2284         int i;
2285         for(i=0; i<20; i++)
2286             if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2287                 s->tmpgexs= 1;
2288             }
2289
2290 /*        for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2291             av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2292         }
2293             av_log(avctx, AV_LOG_ERROR, "\n");*/
2294     }
2295
2296     /* we parse the DTG active format information */
2297     if (buf_end - p >= 5 &&
2298         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2299         int flags = p[4];
2300         p += 5;
2301         if (flags & 0x80) {
2302             /* skip event id */
2303             p += 2;
2304         }
2305         if (flags & 0x40) {
2306             if (buf_end - p < 1)
2307                 return;
2308 #if FF_API_AFD
2309 FF_DISABLE_DEPRECATION_WARNINGS
2310             avctx->dtg_active_format = p[0] & 0x0f;
2311 FF_ENABLE_DEPRECATION_WARNINGS
2312 #endif /* FF_API_AFD */
2313             s1->has_afd = 1;
2314             s1->afd     = p[0] & 0x0f;
2315         }
2316     } else if (buf_end - p >= 6 &&
2317                p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2318                p[4] == 0x03) { // S3D_video_format_length
2319         // the 0x7F mask ignores the reserved_bit value
2320         const uint8_t S3D_video_format_type = p[5] & 0x7F;
2321
2322         if (S3D_video_format_type == 0x03 ||
2323             S3D_video_format_type == 0x04 ||
2324             S3D_video_format_type == 0x08 ||
2325             S3D_video_format_type == 0x23) {
2326
2327             s1->has_stereo3d = 1;
2328
2329             switch (S3D_video_format_type) {
2330             case 0x03:
2331                 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2332                 break;
2333             case 0x04:
2334                 s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2335                 break;
2336             case 0x08:
2337                 s1->stereo3d.type = AV_STEREO3D_2D;
2338                 break;
2339             case 0x23:
2340                 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2341                 break;
2342             }
2343         }
2344     } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2345         return;
2346     }
2347 }
2348
2349 static void mpeg_decode_gop(AVCodecContext *avctx,
2350                             const uint8_t *buf, int buf_size)
2351 {
2352     Mpeg1Context *s1  = avctx->priv_data;
2353     MpegEncContext *s = &s1->mpeg_enc_ctx;
2354     int broken_link;
2355     int64_t tc;
2356
2357     init_get_bits(&s->gb, buf, buf_size * 8);
2358
2359     tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2360
2361     s->closed_gop = get_bits1(&s->gb);
2362     /* broken_link indicate that after editing the
2363      * reference frames of the first B-Frames after GOP I-Frame
2364      * are missing (open gop) */
2365     broken_link = get_bits1(&s->gb);
2366
2367     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2368         char tcbuf[AV_TIMECODE_STR_SIZE];
2369         av_timecode_make_mpeg_tc_string(tcbuf, tc);
2370         av_log(s->avctx, AV_LOG_DEBUG,
2371                "GOP (%s) closed_gop=%d broken_link=%d\n",
2372                tcbuf, s->closed_gop, broken_link);
2373     }
2374 }
2375
2376 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2377                          int *got_output, const uint8_t *buf, int buf_size)
2378 {
2379     Mpeg1Context *s = avctx->priv_data;
2380     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2381     const uint8_t *buf_ptr = buf;
2382     const uint8_t *buf_end = buf + buf_size;
2383     int ret, input_size;
2384     int last_code = 0, skip_frame = 0;
2385     int picture_start_code_seen = 0;
2386
2387     for (;;) {
2388         /* find next start code */
2389         uint32_t start_code = -1;
2390         buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2391         if (start_code > 0x1ff) {
2392             if (!skip_frame) {
2393                 if (HAVE_THREADS &&
2394                     (avctx->active_thread_type & FF_THREAD_SLICE) &&
2395                     !avctx->hwaccel) {
2396                     int i;
2397                     av_assert0(avctx->thread_count > 1);
2398
2399                     avctx->execute(avctx, slice_decode_thread,
2400                                    &s2->thread_context[0], NULL,
2401                                    s->slice_count, sizeof(void *));
2402                     for (i = 0; i < s->slice_count; i++)
2403                         s2->er.error_count += s2->thread_context[i]->er.error_count;
2404                 }
2405
2406                 if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
2407                     && uses_vdpau(avctx))
2408                     ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2409
2410                 ret = slice_end(avctx, picture);
2411                 if (ret < 0)
2412                     return ret;
2413                 else if (ret) {
2414                     // FIXME: merge with the stuff in mpeg_decode_slice
2415                     if (s2->last_picture_ptr || s2->low_delay)
2416                         *got_output = 1;
2417                 }
2418             }
2419             s2->pict_type = 0;
2420
2421             if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2422                 return AVERROR_INVALIDDATA;
2423
2424             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2425         }
2426
2427         input_size = buf_end - buf_ptr;
2428
2429         if (avctx->debug & FF_DEBUG_STARTCODE)
2430             av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2431                    start_code, buf_ptr - buf, input_size);
2432
2433         /* prepare data for next start code */
2434         switch (start_code) {
2435         case SEQ_START_CODE:
2436             if (last_code == 0) {
2437                 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2438                 if (buf != avctx->extradata)
2439                     s->sync = 1;
2440             } else {
2441                 av_log(avctx, AV_LOG_ERROR,
2442                        "ignoring SEQ_START_CODE after %X\n", last_code);
2443                 if (avctx->err_recognition & AV_EF_EXPLODE)
2444                     return AVERROR_INVALIDDATA;
2445             }
2446             break;
2447
2448         case PICTURE_START_CODE:
2449             if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2450                /* If it's a frame picture, there can't be more than one picture header.
2451                   Yet, it does happen and we need to handle it. */
2452                av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2453                break;
2454             }
2455             picture_start_code_seen = 1;
2456
2457             if (s2->width <= 0 || s2->height <= 0) {
2458                 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2459                        s2->width, s2->height);
2460                 return AVERROR_INVALIDDATA;
2461             }
2462
2463             if (s->tmpgexs){
2464                 s2->intra_dc_precision= 3;
2465                 s2->intra_matrix[0]= 1;
2466             }
2467             if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2468                 !avctx->hwaccel && s->slice_count) {
2469                 int i;
2470
2471                 avctx->execute(avctx, slice_decode_thread,
2472                                s2->thread_context, NULL,
2473                                s->slice_count, sizeof(void *));
2474                 for (i = 0; i < s->slice_count; i++)
2475                     s2->er.error_count += s2->thread_context[i]->er.error_count;
2476                 s->slice_count = 0;
2477             }
2478             if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2479                 ret = mpeg_decode_postinit(avctx);
2480                 if (ret < 0) {
2481                     av_log(avctx, AV_LOG_ERROR,
2482                            "mpeg_decode_postinit() failure\n");
2483                     return ret;
2484                 }
2485
2486                 /* We have a complete image: we try to decompress it. */
2487                 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2488                     s2->pict_type = 0;
2489                 s->first_slice = 1;
2490                 last_code      = PICTURE_START_CODE;
2491             } else {
2492                 av_log(avctx, AV_LOG_ERROR,
2493                        "ignoring pic after %X\n", last_code);
2494                 if (avctx->err_recognition & AV_EF_EXPLODE)
2495                     return AVERROR_INVALIDDATA;
2496             }
2497             break;
2498         case EXT_START_CODE:
2499             init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2500
2501             switch (get_bits(&s2->gb, 4)) {
2502             case 0x1:
2503                 if (last_code == 0) {
2504                     mpeg_decode_sequence_extension(s);
2505                 } else {
2506                     av_log(avctx, AV_LOG_ERROR,
2507                            "ignoring seq ext after %X\n", last_code);
2508                     if (avctx->err_recognition & AV_EF_EXPLODE)
2509                         return AVERROR_INVALIDDATA;
2510                 }
2511                 break;
2512             case 0x2:
2513                 mpeg_decode_sequence_display_extension(s);
2514                 break;
2515             case 0x3:
2516                 mpeg_decode_quant_matrix_extension(s2);
2517                 break;
2518             case 0x7:
2519                 mpeg_decode_picture_display_extension(s);
2520                 break;
2521             case 0x8:
2522                 if (last_code == PICTURE_START_CODE) {
2523                     mpeg_decode_picture_coding_extension(s);
2524                 } else {
2525                     av_log(avctx, AV_LOG_ERROR,
2526                            "ignoring pic cod ext after %X\n", last_code);
2527                     if (avctx->err_recognition & AV_EF_EXPLODE)
2528                         return AVERROR_INVALIDDATA;
2529                 }
2530                 break;
2531             }
2532             break;
2533         case USER_START_CODE:
2534             mpeg_decode_user_data(avctx, buf_ptr, input_size);
2535             break;
2536         case GOP_START_CODE:
2537             if (last_code == 0) {
2538                 s2->first_field = 0;
2539                 mpeg_decode_gop(avctx, buf_ptr, input_size);
2540                 s->sync = 1;
2541             } else {
2542                 av_log(avctx, AV_LOG_ERROR,
2543                        "ignoring GOP_START_CODE after %X\n", last_code);
2544                 if (avctx->err_recognition & AV_EF_EXPLODE)
2545                     return AVERROR_INVALIDDATA;
2546             }
2547             break;
2548         default:
2549             if (start_code >= SLICE_MIN_START_CODE &&
2550                 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2551                 if (s2->progressive_sequence && !s2->progressive_frame) {
2552                     s2->progressive_frame = 1;
2553                     av_log(s2->avctx, AV_LOG_ERROR,
2554                            "interlaced frame in progressive sequence, ignoring\n");
2555                 }
2556
2557                 if (s2->picture_structure == 0 ||
2558                     (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2559                     av_log(s2->avctx, AV_LOG_ERROR,
2560                            "picture_structure %d invalid, ignoring\n",
2561                            s2->picture_structure);
2562                     s2->picture_structure = PICT_FRAME;
2563                 }
2564
2565                 if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2566                     av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2567
2568                 if (s2->picture_structure == PICT_FRAME) {
2569                     s2->first_field = 0;
2570                     s2->v_edge_pos  = 16 * s2->mb_height;
2571                 } else {
2572                     s2->first_field ^= 1;
2573                     s2->v_edge_pos   = 8 * s2->mb_height;
2574                     memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2575                 }
2576             }
2577             if (start_code >= SLICE_MIN_START_CODE &&
2578                 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2579                 const int field_pic = s2->picture_structure != PICT_FRAME;
2580                 int mb_y = start_code - SLICE_MIN_START_CODE;
2581                 last_code = SLICE_MIN_START_CODE;
2582                 if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2583                     mb_y += (*buf_ptr&0xE0)<<2;
2584
2585                 mb_y <<= field_pic;
2586                 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2587                     mb_y++;
2588
2589                 if (buf_end - buf_ptr < 2) {
2590                     av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2591                     return AVERROR_INVALIDDATA;
2592                 }
2593
2594                 if (mb_y >= s2->mb_height) {
2595                     av_log(s2->avctx, AV_LOG_ERROR,
2596                            "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2597                     return -1;
2598                 }
2599
2600                 if (!s2->last_picture_ptr) {
2601                     /* Skip B-frames if we do not have reference frames and
2602                      * GOP is not closed. */
2603                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
2604                         if (!s2->closed_gop) {
2605                             skip_frame = 1;
2606                             break;
2607                         }
2608                     }
2609                 }
2610                 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
2611                     s->sync = 1;
2612                 if (!s2->next_picture_ptr) {
2613                     /* Skip P-frames if we do not have a reference frame or
2614                      * we have an invalid header. */
2615                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2616                         skip_frame = 1;
2617                         break;
2618                     }
2619                 }
2620                 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2621                      s2->pict_type == AV_PICTURE_TYPE_B) ||
2622                     (avctx->skip_frame >= AVDISCARD_NONKEY &&
2623                      s2->pict_type != AV_PICTURE_TYPE_I) ||
2624                     avctx->skip_frame >= AVDISCARD_ALL) {
2625                     skip_frame = 1;
2626                     break;
2627                 }
2628
2629                 if (!s->mpeg_enc_ctx_allocated)
2630                     break;
2631
2632                 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2633                     if (mb_y < avctx->skip_top ||
2634                         mb_y >= s2->mb_height - avctx->skip_bottom)
2635                         break;
2636                 }
2637
2638                 if (!s2->pict_type) {
2639                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2640                     if (avctx->err_recognition & AV_EF_EXPLODE)
2641                         return AVERROR_INVALIDDATA;
2642                     break;
2643                 }
2644
2645                 if (s->first_slice) {
2646                     skip_frame     = 0;
2647                     s->first_slice = 0;
2648                     if (mpeg_field_start(s2, buf, buf_size) < 0)
2649                         return -1;
2650                 }
2651                 if (!s2->current_picture_ptr) {
2652                     av_log(avctx, AV_LOG_ERROR,
2653                            "current_picture not initialized\n");
2654                     return AVERROR_INVALIDDATA;
2655                 }
2656
2657                 if (uses_vdpau(avctx)) {
2658                     s->slice_count++;
2659                     break;
2660                 }
2661
2662                 if (HAVE_THREADS &&
2663                     (avctx->active_thread_type & FF_THREAD_SLICE) &&
2664                     !avctx->hwaccel) {
2665                     int threshold = (s2->mb_height * s->slice_count +
2666                                      s2->slice_context_count / 2) /
2667                                     s2->slice_context_count;
2668                     av_assert0(avctx->thread_count > 1);
2669                     if (threshold <= mb_y) {
2670                         MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2671
2672                         thread_context->start_mb_y = mb_y;
2673                         thread_context->end_mb_y   = s2->mb_height;
2674                         if (s->slice_count) {
2675                             s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2676                             ret = ff_update_duplicate_context(thread_context, s2);
2677                             if (ret < 0)
2678                                 return ret;
2679                         }
2680                         init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2681                         s->slice_count++;
2682                     }
2683                     buf_ptr += 2; // FIXME add minimum number of bytes per slice
2684                 } else {
2685                     ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2686                     emms_c();
2687
2688                     if (ret < 0) {
2689                         if (avctx->err_recognition & AV_EF_EXPLODE)
2690                             return ret;
2691                         if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2692                             ff_er_add_slice(&s2->er, s2->resync_mb_x,
2693                                             s2->resync_mb_y, s2->mb_x, s2->mb_y,
2694                                             ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2695                     } else {
2696                         ff_er_add_slice(&s2->er, s2->resync_mb_x,
2697                                         s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2698                                         ER_AC_END | ER_DC_END | ER_MV_END);
2699                     }
2700                 }
2701             }
2702             break;
2703         }
2704     }
2705 }
2706
2707 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2708                              int *got_output, AVPacket *avpkt)
2709 {
2710     const uint8_t *buf = avpkt->data;
2711     int ret;
2712     int buf_size = avpkt->size;
2713     Mpeg1Context *s = avctx->priv_data;
2714     AVFrame *picture = data;
2715     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2716
2717     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2718         /* special case for last picture */
2719         if (s2->low_delay == 0 && s2->next_picture_ptr) {
2720             int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2721             if (ret < 0)
2722                 return ret;
2723
2724             s2->next_picture_ptr = NULL;
2725
2726             *got_output = 1;
2727         }
2728         return buf_size;
2729     }
2730
2731     if (s2->flags & CODEC_FLAG_TRUNCATED) {
2732         int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2733                                            buf_size, NULL);
2734
2735         if (ff_combine_frame(&s2->parse_context, next,
2736                              (const uint8_t **) &buf, &buf_size) < 0)
2737             return buf_size;
2738     }
2739
2740     s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2741     if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2742                                            || s2->codec_tag == AV_RL32("BW10")
2743                                           ))
2744         vcr2_init_sequence(avctx);
2745
2746     s->slice_count = 0;
2747
2748     if (avctx->extradata && !s->extradata_decoded) {
2749         ret = decode_chunks(avctx, picture, got_output,
2750                             avctx->extradata, avctx->extradata_size);
2751         if (*got_output) {
2752             av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2753             *got_output = 0;
2754         }
2755         s->extradata_decoded = 1;
2756         if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2757             s2->current_picture_ptr = NULL;
2758             return ret;
2759         }
2760     }
2761
2762     ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2763     if (ret<0 || *got_output)
2764         s2->current_picture_ptr = NULL;
2765
2766     return ret;
2767 }
2768
2769 static void flush(AVCodecContext *avctx)
2770 {
2771     Mpeg1Context *s = avctx->priv_data;
2772
2773     s->sync       = 0;
2774
2775     ff_mpeg_flush(avctx);
2776 }
2777
2778 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2779 {
2780     Mpeg1Context *s = avctx->priv_data;
2781
2782     if (s->mpeg_enc_ctx_allocated)
2783         ff_mpv_common_end(&s->mpeg_enc_ctx);
2784     av_freep(&s->a53_caption);
2785     return 0;
2786 }
2787
2788 static const AVProfile mpeg2_video_profiles[] = {
2789     { FF_PROFILE_MPEG2_422,          "4:2:2"              },
2790     { FF_PROFILE_MPEG2_HIGH,         "High"               },
2791     { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
2792     { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
2793     { FF_PROFILE_MPEG2_MAIN,         "Main"               },
2794     { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
2795     { FF_PROFILE_RESERVED,           "Reserved"           },
2796     { FF_PROFILE_RESERVED,           "Reserved"           },
2797     { FF_PROFILE_UNKNOWN                                  },
2798 };
2799
2800 AVCodec ff_mpeg1video_decoder = {
2801     .name                  = "mpeg1video",
2802     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2803     .type                  = AVMEDIA_TYPE_VIDEO,
2804     .id                    = AV_CODEC_ID_MPEG1VIDEO,
2805     .priv_data_size        = sizeof(Mpeg1Context),
2806     .init                  = mpeg_decode_init,
2807     .close                 = mpeg_decode_end,
2808     .decode                = mpeg_decode_frame,
2809     .capabilities          = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2810                              CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2811                              CODEC_CAP_SLICE_THREADS,
2812     .flush                 = flush,
2813     .max_lowres            = 3,
2814     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2815 };
2816
2817 AVCodec ff_mpeg2video_decoder = {
2818     .name           = "mpeg2video",
2819     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2820     .type           = AVMEDIA_TYPE_VIDEO,
2821     .id             = AV_CODEC_ID_MPEG2VIDEO,
2822     .priv_data_size = sizeof(Mpeg1Context),
2823     .init           = mpeg_decode_init,
2824     .close          = mpeg_decode_end,
2825     .decode         = mpeg_decode_frame,
2826     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2827                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2828                       CODEC_CAP_SLICE_THREADS,
2829     .flush          = flush,
2830     .max_lowres     = 3,
2831     .profiles       = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2832 };
2833
2834 //legacy decoder
2835 AVCodec ff_mpegvideo_decoder = {
2836     .name           = "mpegvideo",
2837     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2838     .type           = AVMEDIA_TYPE_VIDEO,
2839     .id             = AV_CODEC_ID_MPEG2VIDEO,
2840     .priv_data_size = sizeof(Mpeg1Context),
2841     .init           = mpeg_decode_init,
2842     .close          = mpeg_decode_end,
2843     .decode         = mpeg_decode_frame,
2844     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2845     .flush          = flush,
2846     .max_lowres     = 3,
2847 };
2848
2849 #if FF_API_XVMC
2850 #if CONFIG_MPEG_XVMC_DECODER
2851 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2852 {
2853     if (avctx->active_thread_type & FF_THREAD_SLICE)
2854         return -1;
2855     if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2856         return -1;
2857     if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2858         av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2859     }
2860     mpeg_decode_init(avctx);
2861
2862     avctx->pix_fmt           = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2863     avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2864
2865     return 0;
2866 }
2867
2868 AVCodec ff_mpeg_xvmc_decoder = {
2869     .name           = "mpegvideo_xvmc",
2870     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2871     .type           = AVMEDIA_TYPE_VIDEO,
2872     .id             = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2873     .priv_data_size = sizeof(Mpeg1Context),
2874     .init           = mpeg_mc_decode_init,
2875     .close          = mpeg_decode_end,
2876     .decode         = mpeg_decode_frame,
2877     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2878                       CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2879     .flush          = flush,
2880 };
2881
2882 #endif
2883 #endif /* FF_API_XVMC */
2884
2885 #if CONFIG_MPEG_VDPAU_DECODER
2886 AVCodec ff_mpeg_vdpau_decoder = {
2887     .name           = "mpegvideo_vdpau",
2888     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2889     .type           = AVMEDIA_TYPE_VIDEO,
2890     .id             = AV_CODEC_ID_MPEG2VIDEO,
2891     .priv_data_size = sizeof(Mpeg1Context),
2892     .init           = mpeg_decode_init,
2893     .close          = mpeg_decode_end,
2894     .decode         = mpeg_decode_frame,
2895     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2896                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2897     .flush          = flush,
2898 };
2899 #endif
2900
2901 #if CONFIG_MPEG1_VDPAU_DECODER
2902 AVCodec ff_mpeg1_vdpau_decoder = {
2903     .name           = "mpeg1video_vdpau",
2904     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2905     .type           = AVMEDIA_TYPE_VIDEO,
2906     .id             = AV_CODEC_ID_MPEG1VIDEO,
2907     .priv_data_size = sizeof(Mpeg1Context),
2908     .init           = mpeg_decode_init,
2909     .close          = mpeg_decode_end,
2910     .decode         = mpeg_decode_frame,
2911     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2912                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2913     .flush          = flush,
2914 };
2915 #endif