1e11ea798d9f31952de86c86485c6f16f302c410
[ffmpeg.git] / libavcodec / mpeg12.c
1 /*
2  * MPEG-1/2 decoder
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of 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
30 //#define DEBUG
31 #include "libavutil/avassert.h"
32 #include "libavutil/timecode.h"
33
34 #include "internal.h"
35 #include "avcodec.h"
36 #include "dsputil.h"
37 #include "mpegvideo.h"
38 #include "error_resilience.h"
39 #include "mpeg12.h"
40 #include "mpeg12data.h"
41 #include "mpeg12decdata.h"
42 #include "bytestream.h"
43 #include "vdpau_internal.h"
44 #include "xvmc_internal.h"
45 #include "thread.h"
46
47
48 #define MV_VLC_BITS 9
49 #define MBINCR_VLC_BITS 9
50 #define MB_PAT_VLC_BITS 9
51 #define MB_PTYPE_VLC_BITS 6
52 #define MB_BTYPE_VLC_BITS 6
53
54 static VLC mv_vlc;
55
56 /* as H.263, but only 17 codes */
57 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
58 {
59     int code, sign, val, shift;
60
61     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
62     if (code == 0) {
63         return pred;
64     }
65     if (code < 0) {
66         return 0xffff;
67     }
68
69     sign  = get_bits1(&s->gb);
70     shift = fcode - 1;
71     val   = code;
72     if (shift) {
73         val  = (val - 1) << shift;
74         val |= get_bits(&s->gb, shift);
75         val++;
76     }
77     if (sign)
78         val = -val;
79     val += pred;
80
81     /* modulo decoding */
82     return sign_extend(val, 5 + shift);
83 }
84
85 static inline int mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
86 {
87     int level, dc, diff, i, j, run;
88     int component;
89     RLTable *rl = &ff_rl_mpeg1;
90     uint8_t * const scantable    = s->intra_scantable.permutated;
91     const uint16_t *quant_matrix = s->intra_matrix;
92     const int qscale             = s->qscale;
93
94     /* DC coefficient */
95     component = (n <= 3 ? 0 : n - 4 + 1);
96     diff = decode_dc(&s->gb, component);
97     if (diff >= 0xffff)
98         return -1;
99     dc  = s->last_dc[component];
100     dc += diff;
101     s->last_dc[component] = dc;
102     block[0] = dc * quant_matrix[0];
103     av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
104     i = 0;
105     {
106         OPEN_READER(re, &s->gb);
107         /* now quantify & encode AC coefficients */
108         for (;;) {
109             UPDATE_CACHE(re, &s->gb);
110             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
111
112             if (level == 127) {
113                 break;
114             } else if (level != 0) {
115                 i += run;
116                 j = scantable[i];
117                 level = (level * qscale * quant_matrix[j]) >> 4;
118                 level = (level - 1) | 1;
119                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
120                 LAST_SKIP_BITS(re, &s->gb, 1);
121             } else {
122                 /* escape */
123                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
124                 UPDATE_CACHE(re, &s->gb);
125                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
126                 if (level == -128) {
127                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
128                 } else if (level == 0) {
129                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
130                 }
131                 i += run;
132                 j = scantable[i];
133                 if (level < 0) {
134                     level = -level;
135                     level = (level * qscale * quant_matrix[j]) >> 4;
136                     level = (level - 1) | 1;
137                     level = -level;
138                 } else {
139                     level = (level * qscale * quant_matrix[j]) >> 4;
140                     level = (level - 1) | 1;
141                 }
142             }
143             if (i > 63) {
144                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
145                 return -1;
146             }
147
148             block[j] = level;
149         }
150         CLOSE_READER(re, &s->gb);
151     }
152     s->block_last_index[n] = i;
153    return 0;
154 }
155
156 int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
157 {
158     return mpeg1_decode_block_intra(s, block, n);
159 }
160
161 static inline int mpeg1_decode_block_inter(MpegEncContext *s, int16_t *block, int n)
162 {
163     int level, i, j, run;
164     RLTable *rl = &ff_rl_mpeg1;
165     uint8_t * const scantable    = s->intra_scantable.permutated;
166     const uint16_t *quant_matrix = s->inter_matrix;
167     const int qscale             = s->qscale;
168
169     {
170         OPEN_READER(re, &s->gb);
171         i = -1;
172         // special case for first coefficient, no need to add second VLC table
173         UPDATE_CACHE(re, &s->gb);
174         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
175             level = (3 * qscale * quant_matrix[0]) >> 5;
176             level = (level - 1) | 1;
177             if (GET_CACHE(re, &s->gb) & 0x40000000)
178                 level = -level;
179             block[0] = level;
180             i++;
181             SKIP_BITS(re, &s->gb, 2);
182             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
183                 goto end;
184         }
185         /* now quantify & encode AC coefficients */
186         for (;;) {
187             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
188
189             if (level != 0) {
190                 i += run;
191                 j = scantable[i];
192                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
193                 level = (level - 1) | 1;
194                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
195                 SKIP_BITS(re, &s->gb, 1);
196             } else {
197                 /* escape */
198                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
199                 UPDATE_CACHE(re, &s->gb);
200                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
201                 if (level == -128) {
202                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
203                 } else if (level == 0) {
204                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
205                 }
206                 i += run;
207                 j = scantable[i];
208                 if (level < 0) {
209                     level = -level;
210                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
211                     level = (level - 1) | 1;
212                     level = -level;
213                 } else {
214                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
215                     level = (level - 1) | 1;
216                 }
217             }
218             if (i > 63) {
219                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
220                 return -1;
221             }
222
223             block[j] = level;
224             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
225                 break;
226             UPDATE_CACHE(re, &s->gb);
227         }
228 end:
229         LAST_SKIP_BITS(re, &s->gb, 2);
230         CLOSE_READER(re, &s->gb);
231     }
232     s->block_last_index[n] = i;
233     return 0;
234 }
235
236 /**
237  * Note: this function can read out of range and crash for corrupt streams.
238  * Changing this would eat up any speed benefits it has.
239  * Do not use "fast" flag if you need the code to be robust.
240  */
241 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, int16_t *block, int n)
242 {
243     int level, i, j, run;
244     RLTable *rl = &ff_rl_mpeg1;
245     uint8_t * const scantable = s->intra_scantable.permutated;
246     const int qscale          = s->qscale;
247
248     {
249         OPEN_READER(re, &s->gb);
250         i = -1;
251         // special case for first coefficient, no need to add second VLC table
252         UPDATE_CACHE(re, &s->gb);
253         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
254             level = (3 * qscale) >> 1;
255             level = (level - 1) | 1;
256             if (GET_CACHE(re, &s->gb) & 0x40000000)
257                 level = -level;
258             block[0] = level;
259             i++;
260             SKIP_BITS(re, &s->gb, 2);
261             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
262                 goto end;
263         }
264
265         /* now quantify & encode AC coefficients */
266         for (;;) {
267             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
268
269             if (level != 0) {
270                 i += run;
271                 j = scantable[i];
272                 level = ((level * 2 + 1) * qscale) >> 1;
273                 level = (level - 1) | 1;
274                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
275                 SKIP_BITS(re, &s->gb, 1);
276             } else {
277                 /* escape */
278                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
279                 UPDATE_CACHE(re, &s->gb);
280                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
281                 if (level == -128) {
282                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
283                 } else if (level == 0) {
284                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
285                 }
286                 i += run;
287                 j = scantable[i];
288                 if (level < 0) {
289                     level = -level;
290                     level = ((level * 2 + 1) * qscale) >> 1;
291                     level = (level - 1) | 1;
292                     level = -level;
293                 } else {
294                     level = ((level * 2 + 1) * qscale) >> 1;
295                     level = (level - 1) | 1;
296                 }
297             }
298
299             block[j] = level;
300             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
301                 break;
302             UPDATE_CACHE(re, &s->gb);
303         }
304 end:
305         LAST_SKIP_BITS(re, &s->gb, 2);
306         CLOSE_READER(re, &s->gb);
307     }
308     s->block_last_index[n] = i;
309     return 0;
310 }
311
312
313 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, int16_t *block, int n)
314 {
315     int level, i, j, run;
316     RLTable *rl = &ff_rl_mpeg1;
317     uint8_t * const scantable = s->intra_scantable.permutated;
318     const uint16_t *quant_matrix;
319     const int qscale = s->qscale;
320     int mismatch;
321
322     mismatch = 1;
323
324     {
325         OPEN_READER(re, &s->gb);
326         i = -1;
327         if (n < 4)
328             quant_matrix = s->inter_matrix;
329         else
330             quant_matrix = s->chroma_inter_matrix;
331
332         // special case for first coefficient, no need to add second VLC table
333         UPDATE_CACHE(re, &s->gb);
334         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
335             level= (3 * qscale * quant_matrix[0]) >> 5;
336             if (GET_CACHE(re, &s->gb) & 0x40000000)
337                 level = -level;
338             block[0]  = level;
339             mismatch ^= level;
340             i++;
341             SKIP_BITS(re, &s->gb, 2);
342             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
343                 goto end;
344         }
345
346         /* now quantify & encode AC coefficients */
347         for (;;) {
348             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
349
350             if (level != 0) {
351                 i += run;
352                 j = scantable[i];
353                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
354                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
355                 SKIP_BITS(re, &s->gb, 1);
356             } else {
357                 /* escape */
358                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
359                 UPDATE_CACHE(re, &s->gb);
360                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
361
362                 i += run;
363                 j = scantable[i];
364                 if (level < 0) {
365                     level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
366                     level = -level;
367                 } else {
368                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
369                 }
370             }
371             if (i > 63) {
372                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
373                 return -1;
374             }
375
376             mismatch ^= level;
377             block[j]  = level;
378             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
379                 break;
380             UPDATE_CACHE(re, &s->gb);
381         }
382 end:
383         LAST_SKIP_BITS(re, &s->gb, 2);
384         CLOSE_READER(re, &s->gb);
385     }
386     block[63] ^= (mismatch & 1);
387
388     s->block_last_index[n] = i;
389     return 0;
390 }
391
392 /**
393  * Note: this function can read out of range and crash for corrupt streams.
394  * Changing this would eat up any speed benefits it has.
395  * Do not use "fast" flag if you need the code to be robust.
396  */
397 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
398                                                     int16_t *block, int n)
399 {
400     int level, i, j, run;
401     RLTable *rl = &ff_rl_mpeg1;
402     uint8_t * const scantable = s->intra_scantable.permutated;
403     const int qscale          = s->qscale;
404     OPEN_READER(re, &s->gb);
405     i = -1;
406
407     // special case for first coefficient, no need to add second VLC table
408     UPDATE_CACHE(re, &s->gb);
409     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
410         level = (3 * qscale) >> 1;
411         if (GET_CACHE(re, &s->gb) & 0x40000000)
412             level = -level;
413         block[0] = level;
414         i++;
415         SKIP_BITS(re, &s->gb, 2);
416         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
417             goto end;
418     }
419
420     /* now quantify & encode AC coefficients */
421     for (;;) {
422         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
423
424         if (level != 0) {
425             i += run;
426             j  = scantable[i];
427             level = ((level * 2 + 1) * qscale) >> 1;
428             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
429             SKIP_BITS(re, &s->gb, 1);
430         } else {
431             /* escape */
432             run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
433             UPDATE_CACHE(re, &s->gb);
434             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
435
436             i += run;
437             j  = scantable[i];
438             if (level < 0) {
439                 level = ((-level * 2 + 1) * qscale) >> 1;
440                 level = -level;
441             } else {
442                 level = ((level * 2 + 1) * qscale) >> 1;
443             }
444         }
445
446         block[j] = level;
447         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
448             break;
449         UPDATE_CACHE(re, &s->gb);
450     }
451 end:
452     LAST_SKIP_BITS(re, &s->gb, 2);
453     CLOSE_READER(re, &s->gb);
454     s->block_last_index[n] = i;
455     return 0;
456 }
457
458
459 static inline int mpeg2_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
460 {
461     int level, dc, diff, i, j, run;
462     int component;
463     RLTable *rl;
464     uint8_t * const scantable = s->intra_scantable.permutated;
465     const uint16_t *quant_matrix;
466     const int qscale = s->qscale;
467     int mismatch;
468
469     /* DC coefficient */
470     if (n < 4) {
471         quant_matrix = s->intra_matrix;
472         component = 0;
473     } else {
474         quant_matrix = s->chroma_intra_matrix;
475         component = (n & 1) + 1;
476     }
477     diff = decode_dc(&s->gb, component);
478     if (diff >= 0xffff)
479         return -1;
480     dc  = s->last_dc[component];
481     dc += diff;
482     s->last_dc[component] = dc;
483     block[0] = dc << (3 - s->intra_dc_precision);
484     av_dlog(s->avctx, "dc=%d\n", block[0]);
485     mismatch = block[0] ^ 1;
486     i = 0;
487     if (s->intra_vlc_format)
488         rl = &ff_rl_mpeg2;
489     else
490         rl = &ff_rl_mpeg1;
491
492     {
493         OPEN_READER(re, &s->gb);
494         /* now quantify & encode AC coefficients */
495         for (;;) {
496             UPDATE_CACHE(re, &s->gb);
497             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
498
499             if (level == 127) {
500                 break;
501             } else if (level != 0) {
502                 i += run;
503                 j  = scantable[i];
504                 level = (level * qscale * quant_matrix[j]) >> 4;
505                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
506                 LAST_SKIP_BITS(re, &s->gb, 1);
507             } else {
508                 /* escape */
509                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
510                 UPDATE_CACHE(re, &s->gb);
511                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
512                 i += run;
513                 j  = scantable[i];
514                 if (level < 0) {
515                     level = (-level * qscale * quant_matrix[j]) >> 4;
516                     level = -level;
517                 } else {
518                     level = (level * qscale * quant_matrix[j]) >> 4;
519                 }
520             }
521             if (i > 63) {
522                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
523                 return -1;
524             }
525
526             mismatch ^= level;
527             block[j]  = level;
528         }
529         CLOSE_READER(re, &s->gb);
530     }
531     block[63] ^= mismatch & 1;
532
533     s->block_last_index[n] = i;
534     return 0;
535 }
536
537 /**
538  * Note: this function can read out of range and crash for corrupt streams.
539  * Changing this would eat up any speed benefits it has.
540  * Do not use "fast" flag if you need the code to be robust.
541  */
542 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
543 {
544     int level, dc, diff, j, run;
545     int component;
546     RLTable *rl;
547     uint8_t * scantable = s->intra_scantable.permutated;
548     const uint16_t *quant_matrix;
549     const int qscale = s->qscale;
550
551     /* DC coefficient */
552     if (n < 4) {
553         quant_matrix = s->intra_matrix;
554         component = 0;
555     } else {
556         quant_matrix = s->chroma_intra_matrix;
557         component = (n & 1) + 1;
558     }
559     diff = decode_dc(&s->gb, component);
560     if (diff >= 0xffff)
561         return -1;
562     dc = s->last_dc[component];
563     dc += diff;
564     s->last_dc[component] = dc;
565     block[0] = dc << (3 - s->intra_dc_precision);
566     if (s->intra_vlc_format)
567         rl = &ff_rl_mpeg2;
568     else
569         rl = &ff_rl_mpeg1;
570
571     {
572         OPEN_READER(re, &s->gb);
573         /* now quantify & encode AC coefficients */
574         for (;;) {
575             UPDATE_CACHE(re, &s->gb);
576             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
577
578             if (level == 127) {
579                 break;
580             } else if (level != 0) {
581                 scantable += run;
582                 j = *scantable;
583                 level = (level * qscale * quant_matrix[j]) >> 4;
584                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
585                 LAST_SKIP_BITS(re, &s->gb, 1);
586             } else {
587                 /* escape */
588                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
589                 UPDATE_CACHE(re, &s->gb);
590                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
591                 scantable += run;
592                 j = *scantable;
593                 if (level < 0) {
594                     level = (-level * qscale * quant_matrix[j]) >> 4;
595                     level = -level;
596                 } else {
597                     level = (level * qscale * quant_matrix[j]) >> 4;
598                 }
599             }
600
601             block[j] = level;
602         }
603         CLOSE_READER(re, &s->gb);
604     }
605
606     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
607     return 0;
608 }
609
610 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
611
612 #define INIT_2D_VLC_RL(rl, static_size)\
613 {\
614     static RL_VLC_ELEM rl_vlc_table[static_size];\
615     INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
616                     &rl.table_vlc[0][1], 4, 2,\
617                     &rl.table_vlc[0][0], 4, 2, static_size);\
618 \
619     rl.rl_vlc[0] = rl_vlc_table;\
620     init_2d_vlc_rl(&rl);\
621 }
622
623 static void init_2d_vlc_rl(RLTable *rl)
624 {
625     int i;
626
627     for (i = 0; i < rl->vlc.table_size; i++) {
628         int code = rl->vlc.table[i][0];
629         int len  = rl->vlc.table[i][1];
630         int level, run;
631
632         if (len == 0) { // illegal code
633             run   = 65;
634             level = MAX_LEVEL;
635         } else if (len<0) { //more bits needed
636             run   = 0;
637             level = code;
638         } else {
639             if (code == rl->n) { //esc
640                 run   = 65;
641                 level = 0;
642             } else if (code == rl->n+1) { //eob
643                 run   = 0;
644                 level = 127;
645             } else {
646                 run   = rl->table_run  [code] + 1;
647                 level = rl->table_level[code];
648             }
649         }
650         rl->rl_vlc[0][i].len   = len;
651         rl->rl_vlc[0][i].level = level;
652         rl->rl_vlc[0][i].run   = run;
653     }
654 }
655
656 void ff_mpeg12_common_init(MpegEncContext *s)
657 {
658
659     s->y_dc_scale_table =
660     s->c_dc_scale_table = ff_mpeg2_dc_scale_table[s->intra_dc_precision];
661
662 }
663
664 void ff_mpeg1_clean_buffers(MpegEncContext *s)
665 {
666     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
667     s->last_dc[1] = s->last_dc[0];
668     s->last_dc[2] = s->last_dc[0];
669     memset(s->last_mv, 0, sizeof(s->last_mv));
670 }
671
672
673 /******************************************/
674 /* decoding */
675
676 VLC ff_dc_lum_vlc;
677 VLC ff_dc_chroma_vlc;
678
679 static VLC mbincr_vlc;
680 static VLC mb_ptype_vlc;
681 static VLC mb_btype_vlc;
682 static VLC mb_pat_vlc;
683
684 av_cold void ff_mpeg12_init_vlcs(void)
685 {
686     static int done = 0;
687
688     if (!done) {
689         done = 1;
690
691         INIT_VLC_STATIC(&ff_dc_lum_vlc, DC_VLC_BITS, 12,
692                         ff_mpeg12_vlc_dc_lum_bits, 1, 1,
693                         ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
694         INIT_VLC_STATIC(&ff_dc_chroma_vlc,  DC_VLC_BITS, 12,
695                         ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
696                         ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
697         INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
698                         &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
699                         &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
700         INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
701                         &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
702                         &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
703         INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
704                         &ff_mpeg12_mbPatTable[0][1], 2, 1,
705                         &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
706
707         INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
708                         &table_mb_ptype[0][1], 2, 1,
709                         &table_mb_ptype[0][0], 2, 1, 64);
710         INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
711                         &table_mb_btype[0][1], 2, 1,
712                         &table_mb_btype[0][0], 2, 1, 64);
713         ff_init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
714         ff_init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
715
716         INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
717         INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
718     }
719 }
720
721 static inline int get_dmv(MpegEncContext *s)
722 {
723     if (get_bits1(&s->gb))
724         return 1 - (get_bits1(&s->gb) << 1);
725     else
726         return 0;
727 }
728
729 static inline int get_qscale(MpegEncContext *s)
730 {
731     int qscale = get_bits(&s->gb, 5);
732     if (s->q_scale_type) {
733         return non_linear_qscale[qscale];
734     } else {
735         return qscale << 1;
736     }
737 }
738
739 static void exchange_uv(MpegEncContext *s)
740 {
741     int16_t (*tmp)[64];
742
743     tmp           = s->pblocks[4];
744     s->pblocks[4] = s->pblocks[5];
745     s->pblocks[5] = tmp;
746 }
747
748 /* motion type (for MPEG-2) */
749 #define MT_FIELD 1
750 #define MT_FRAME 2
751 #define MT_16X8  2
752 #define MT_DMV   3
753
754 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
755 {
756     int i, j, k, cbp, val, mb_type, motion_type;
757     const int mb_block_count = 4 + (1 << s->chroma_format);
758
759     av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
760
761     av_assert2(s->mb_skipped == 0);
762
763     if (s->mb_skip_run-- != 0) {
764         if (s->pict_type == AV_PICTURE_TYPE_P) {
765             s->mb_skipped = 1;
766             s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride] = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
767         } else {
768             int mb_type;
769
770             if (s->mb_x)
771                 mb_type = s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
772             else
773                 mb_type = s->current_picture.f.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1]; // FIXME not sure if this is allowed in MPEG at all
774             if (IS_INTRA(mb_type)) {
775                 av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
776                 return -1;
777             }
778             s->current_picture.f.mb_type[s->mb_x + s->mb_y*s->mb_stride] =
779                 mb_type | MB_TYPE_SKIP;
780 //            av_assert2(s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1] & (MB_TYPE_16x16 | MB_TYPE_16x8));
781
782             if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
783                 s->mb_skipped = 1;
784         }
785
786         return 0;
787     }
788
789     switch (s->pict_type) {
790     default:
791     case AV_PICTURE_TYPE_I:
792         if (get_bits1(&s->gb) == 0) {
793             if (get_bits1(&s->gb) == 0) {
794                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
795                 return -1;
796             }
797             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
798         } else {
799             mb_type = MB_TYPE_INTRA;
800         }
801         break;
802     case AV_PICTURE_TYPE_P:
803         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
804         if (mb_type < 0) {
805             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
806             return -1;
807         }
808         mb_type = ptype2mb_type[mb_type];
809         break;
810     case AV_PICTURE_TYPE_B:
811         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
812         if (mb_type < 0) {
813             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
814             return -1;
815         }
816         mb_type = btype2mb_type[mb_type];
817         break;
818     }
819     av_dlog(s->avctx, "mb_type=%x\n", mb_type);
820 //    motion_type = 0; /* avoid warning */
821     if (IS_INTRA(mb_type)) {
822         s->dsp.clear_blocks(s->block[0]);
823
824         if (!s->chroma_y_shift) {
825             s->dsp.clear_blocks(s->block[6]);
826         }
827
828         /* compute DCT type */
829         if (s->picture_structure == PICT_FRAME && // FIXME add an interlaced_dct coded var?
830             !s->frame_pred_frame_dct) {
831             s->interlaced_dct = get_bits1(&s->gb);
832         }
833
834         if (IS_QUANT(mb_type))
835             s->qscale = get_qscale(s);
836
837         if (s->concealment_motion_vectors) {
838             /* just parse them */
839             if (s->picture_structure != PICT_FRAME)
840                 skip_bits1(&s->gb); /* field select */
841
842             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
843                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
844             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
845                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
846
847             skip_bits1(&s->gb); /* marker */
848         } else
849             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
850         s->mb_intra = 1;
851         // if 1, we memcpy blocks in xvmcvideo
852         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
853             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
854             if (s->swap_uv) {
855                 exchange_uv(s);
856             }
857         }
858
859         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
860             if (s->flags2 & CODEC_FLAG2_FAST) {
861                 for (i = 0; i < 6; i++) {
862                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
863                 }
864             } else {
865                 for (i = 0; i < mb_block_count; i++) {
866                     if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
867                         return -1;
868                 }
869             }
870         } else {
871             for (i = 0; i < 6; i++) {
872                 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
873                     return -1;
874             }
875         }
876     } else {
877         if (mb_type & MB_TYPE_ZERO_MV) {
878             av_assert2(mb_type & MB_TYPE_CBP);
879
880             s->mv_dir = MV_DIR_FORWARD;
881             if (s->picture_structure == PICT_FRAME) {
882                 if (s->picture_structure == PICT_FRAME
883                     && !s->frame_pred_frame_dct)
884                     s->interlaced_dct = get_bits1(&s->gb);
885                 s->mv_type = MV_TYPE_16X16;
886             } else {
887                 s->mv_type = MV_TYPE_FIELD;
888                 mb_type |= MB_TYPE_INTERLACED;
889                 s->field_select[0][0] = s->picture_structure - 1;
890             }
891
892             if (IS_QUANT(mb_type))
893                 s->qscale = get_qscale(s);
894
895             s->last_mv[0][0][0] = 0;
896             s->last_mv[0][0][1] = 0;
897             s->last_mv[0][1][0] = 0;
898             s->last_mv[0][1][1] = 0;
899             s->mv[0][0][0] = 0;
900             s->mv[0][0][1] = 0;
901         } else {
902             av_assert2(mb_type & MB_TYPE_L0L1);
903             // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
904             /* get additional motion vector type */
905             if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct)
906                 motion_type = MT_FRAME;
907             else {
908                 motion_type = get_bits(&s->gb, 2);
909                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
910                     s->interlaced_dct = get_bits1(&s->gb);
911             }
912
913             if (IS_QUANT(mb_type))
914                 s->qscale = get_qscale(s);
915
916             /* motion vectors */
917             s->mv_dir = (mb_type >> 13) & 3;
918             av_dlog(s->avctx, "motion_type=%d\n", motion_type);
919             switch (motion_type) {
920             case MT_FRAME: /* or MT_16X8 */
921                 if (s->picture_structure == PICT_FRAME) {
922                     mb_type |= MB_TYPE_16x16;
923                     s->mv_type = MV_TYPE_16X16;
924                     for (i = 0; i < 2; i++) {
925                         if (USES_LIST(mb_type, i)) {
926                             /* MT_FRAME */
927                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
928                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
929                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
930                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
931                             /* full_pel: only for MPEG-1 */
932                             if (s->full_pel[i]) {
933                                 s->mv[i][0][0] <<= 1;
934                                 s->mv[i][0][1] <<= 1;
935                             }
936                         }
937                     }
938                 } else {
939                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
940                     s->mv_type = MV_TYPE_16X8;
941                     for (i = 0; i < 2; i++) {
942                         if (USES_LIST(mb_type, i)) {
943                             /* MT_16X8 */
944                             for (j = 0; j < 2; j++) {
945                                 s->field_select[i][j] = get_bits1(&s->gb);
946                                 for (k = 0; k < 2; k++) {
947                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
948                                                              s->last_mv[i][j][k]);
949                                     s->last_mv[i][j][k] = val;
950                                     s->mv[i][j][k]      = val;
951                                 }
952                             }
953                         }
954                     }
955                 }
956                 break;
957             case MT_FIELD:
958                 s->mv_type = MV_TYPE_FIELD;
959                 if (s->picture_structure == PICT_FRAME) {
960                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
961                     for (i = 0; i < 2; i++) {
962                         if (USES_LIST(mb_type, i)) {
963                             for (j = 0; j < 2; j++) {
964                                 s->field_select[i][j] = get_bits1(&s->gb);
965                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
966                                                          s->last_mv[i][j][0]);
967                                 s->last_mv[i][j][0] = val;
968                                 s->mv[i][j][0]      = val;
969                                 av_dlog(s->avctx, "fmx=%d\n", val);
970                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
971                                                          s->last_mv[i][j][1] >> 1);
972                                 s->last_mv[i][j][1] = val << 1;
973                                 s->mv[i][j][1]      = val;
974                                 av_dlog(s->avctx, "fmy=%d\n", val);
975                             }
976                         }
977                     }
978                 } else {
979                     av_assert0(!s->progressive_sequence);
980                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
981                     for (i = 0; i < 2; i++) {
982                         if (USES_LIST(mb_type, i)) {
983                             s->field_select[i][0] = get_bits1(&s->gb);
984                             for (k = 0; k < 2; k++) {
985                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
986                                                          s->last_mv[i][0][k]);
987                                 s->last_mv[i][0][k] = val;
988                                 s->last_mv[i][1][k] = val;
989                                 s->mv[i][0][k]      = val;
990                             }
991                         }
992                     }
993                 }
994                 break;
995             case MT_DMV:
996                 if(s->progressive_sequence){
997                     av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
998                     return -1;
999                 }
1000                 s->mv_type = MV_TYPE_DMV;
1001                 for (i = 0; i < 2; i++) {
1002                     if (USES_LIST(mb_type, i)) {
1003                         int dmx, dmy, mx, my, m;
1004                         const int my_shift = s->picture_structure == PICT_FRAME;
1005
1006                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1007                                                 s->last_mv[i][0][0]);
1008                         s->last_mv[i][0][0] = mx;
1009                         s->last_mv[i][1][0] = mx;
1010                         dmx = get_dmv(s);
1011                         my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1012                                                  s->last_mv[i][0][1] >> my_shift);
1013                         dmy = get_dmv(s);
1014
1015
1016                         s->last_mv[i][0][1] = my << my_shift;
1017                         s->last_mv[i][1][1] = my << my_shift;
1018
1019                         s->mv[i][0][0] = mx;
1020                         s->mv[i][0][1] = my;
1021                         s->mv[i][1][0] = mx; // not used
1022                         s->mv[i][1][1] = my; // not used
1023
1024                         if (s->picture_structure == PICT_FRAME) {
1025                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1026
1027                             // m = 1 + 2 * s->top_field_first;
1028                             m = s->top_field_first ? 1 : 3;
1029
1030                             /* top -> top pred */
1031                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1032                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1033                             m = 4 - m;
1034                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1035                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1036                         } else {
1037                             mb_type |= MB_TYPE_16x16;
1038
1039                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1040                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1041                             if (s->picture_structure == PICT_TOP_FIELD)
1042                                 s->mv[i][2][1]--;
1043                             else
1044                                 s->mv[i][2][1]++;
1045                         }
1046                     }
1047                 }
1048                 break;
1049             default:
1050                 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1051                 return -1;
1052             }
1053         }
1054
1055         s->mb_intra = 0;
1056         if (HAS_CBP(mb_type)) {
1057             s->dsp.clear_blocks(s->block[0]);
1058
1059             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1060             if (mb_block_count > 6) {
1061                  cbp <<= mb_block_count - 6;
1062                  cbp  |= get_bits(&s->gb, mb_block_count - 6);
1063                  s->dsp.clear_blocks(s->block[6]);
1064             }
1065             if (cbp <= 0) {
1066                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
1067                 return -1;
1068             }
1069
1070             //if 1, we memcpy blocks in xvmcvideo
1071             if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
1072                 ff_xvmc_pack_pblocks(s, cbp);
1073                 if (s->swap_uv) {
1074                     exchange_uv(s);
1075                 }
1076             }
1077
1078             if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1079                 if (s->flags2 & CODEC_FLAG2_FAST) {
1080                     for (i = 0; i < 6; i++) {
1081                         if (cbp & 32) {
1082                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1083                         } else {
1084                             s->block_last_index[i] = -1;
1085                         }
1086                         cbp += cbp;
1087                     }
1088                 } else {
1089                     cbp <<= 12-mb_block_count;
1090
1091                     for (i = 0; i < mb_block_count; i++) {
1092                         if (cbp & (1 << 11)) {
1093                             if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
1094                                 return -1;
1095                         } else {
1096                             s->block_last_index[i] = -1;
1097                         }
1098                         cbp += cbp;
1099                     }
1100                 }
1101             } else {
1102                 if (s->flags2 & CODEC_FLAG2_FAST) {
1103                     for (i = 0; i < 6; i++) {
1104                         if (cbp & 32) {
1105                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1106                         } else {
1107                             s->block_last_index[i] = -1;
1108                         }
1109                         cbp += cbp;
1110                     }
1111                 } else {
1112                     for (i = 0; i < 6; i++) {
1113                         if (cbp & 32) {
1114                             if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
1115                                 return -1;
1116                         } else {
1117                             s->block_last_index[i] = -1;
1118                         }
1119                         cbp += cbp;
1120                     }
1121                 }
1122             }
1123         } else {
1124             for (i = 0; i < 12; i++)
1125                 s->block_last_index[i] = -1;
1126         }
1127     }
1128
1129     s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1130
1131     return 0;
1132 }
1133
1134 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1135 {
1136     Mpeg1Context *s = avctx->priv_data;
1137     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1138     int i;
1139
1140     /* we need some permutation to store matrices,
1141      * until MPV_common_init() sets the real permutation. */
1142     for (i = 0; i < 64; i++)
1143        s2->dsp.idct_permutation[i]=i;
1144
1145     ff_MPV_decode_defaults(s2);
1146
1147     s->mpeg_enc_ctx.avctx  = avctx;
1148     s->mpeg_enc_ctx.flags  = avctx->flags;
1149     s->mpeg_enc_ctx.flags2 = avctx->flags2;
1150     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1151     ff_mpeg12_init_vlcs();
1152
1153     s->mpeg_enc_ctx_allocated      = 0;
1154     s->mpeg_enc_ctx.picture_number = 0;
1155     s->repeat_field                = 0;
1156     s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1157     avctx->color_range = AVCOL_RANGE_MPEG;
1158     if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1159         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1160     else
1161         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1162     return 0;
1163 }
1164
1165 static int mpeg_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
1166 {
1167     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1168     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1169     int err;
1170
1171     if (avctx == avctx_from || !ctx_from->mpeg_enc_ctx_allocated || !s1->context_initialized)
1172         return 0;
1173
1174     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1175     if (err) return err;
1176
1177     if (!ctx->mpeg_enc_ctx_allocated)
1178         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1179
1180     if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1181         s->picture_number++;
1182
1183     return 0;
1184 }
1185
1186 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1187                                  const uint8_t *new_perm)
1188 {
1189     uint16_t temp_matrix[64];
1190     int i;
1191
1192     memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1193
1194     for (i = 0; i < 64; i++) {
1195         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1196     }
1197 }
1198
1199 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1200 #if CONFIG_MPEG_XVMC_DECODER
1201     AV_PIX_FMT_XVMC_MPEG2_IDCT,
1202     AV_PIX_FMT_XVMC_MPEG2_MC,
1203 #endif
1204 #if CONFIG_MPEG1_VDPAU_HWACCEL
1205     AV_PIX_FMT_VDPAU_MPEG1,
1206 #endif
1207     AV_PIX_FMT_YUV420P,
1208     AV_PIX_FMT_NONE
1209 };
1210
1211 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1212 #if CONFIG_MPEG_XVMC_DECODER
1213     AV_PIX_FMT_XVMC_MPEG2_IDCT,
1214     AV_PIX_FMT_XVMC_MPEG2_MC,
1215 #endif
1216 #if CONFIG_MPEG2_VDPAU_HWACCEL
1217     AV_PIX_FMT_VDPAU_MPEG2,
1218 #endif
1219 #if CONFIG_MPEG2_DXVA2_HWACCEL
1220     AV_PIX_FMT_DXVA2_VLD,
1221 #endif
1222 #if CONFIG_MPEG2_VAAPI_HWACCEL
1223     AV_PIX_FMT_VAAPI_VLD,
1224 #endif
1225     AV_PIX_FMT_YUV420P,
1226     AV_PIX_FMT_NONE
1227 };
1228
1229 static inline int uses_vdpau(AVCodecContext *avctx) {
1230     return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1231 }
1232
1233 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1234 {
1235     Mpeg1Context *s1 = avctx->priv_data;
1236     MpegEncContext *s = &s1->mpeg_enc_ctx;
1237
1238     if(s->chroma_format < 2) {
1239         enum AVPixelFormat res;
1240         res = avctx->get_format(avctx,
1241                                 avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1242                                 mpeg1_hwaccel_pixfmt_list_420 :
1243                                 mpeg2_hwaccel_pixfmt_list_420);
1244         if (res != AV_PIX_FMT_XVMC_MPEG2_IDCT && res != AV_PIX_FMT_XVMC_MPEG2_MC) {
1245             avctx->xvmc_acceleration = 0;
1246         } else if (!avctx->xvmc_acceleration) {
1247             avctx->xvmc_acceleration = 2;
1248         }
1249         return res;
1250     } else if(s->chroma_format == 2)
1251         return AV_PIX_FMT_YUV422P;
1252     else
1253         return AV_PIX_FMT_YUV444P;
1254 }
1255
1256 /* Call this function when we know all parameters.
1257  * It may be called in different places for MPEG-1 and MPEG-2. */
1258 static int mpeg_decode_postinit(AVCodecContext *avctx)
1259 {
1260     Mpeg1Context *s1 = avctx->priv_data;
1261     MpegEncContext *s = &s1->mpeg_enc_ctx;
1262     uint8_t old_permutation[64];
1263
1264     if ((s1->mpeg_enc_ctx_allocated == 0) ||
1265         avctx->coded_width  != s->width   ||
1266         avctx->coded_height != s->height  ||
1267         s1->save_width           != s->width                ||
1268         s1->save_height          != s->height               ||
1269         s1->save_aspect_info     != s->aspect_ratio_info    ||
1270         s1->save_progressive_seq != s->progressive_sequence ||
1271         0)
1272     {
1273
1274         if (s1->mpeg_enc_ctx_allocated) {
1275             ParseContext pc = s->parse_context;
1276             s->parse_context.buffer = 0;
1277             ff_MPV_common_end(s);
1278             s->parse_context = pc;
1279         }
1280
1281         if ((s->width == 0) || (s->height == 0))
1282             return -2;
1283
1284         avcodec_set_dimensions(avctx, s->width, s->height);
1285         if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1286             avctx->rc_max_rate = s->bit_rate;
1287         } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1288                    (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1289             avctx->bit_rate = s->bit_rate;
1290         }
1291         s1->save_aspect_info     = s->aspect_ratio_info;
1292         s1->save_width           = s->width;
1293         s1->save_height          = s->height;
1294         s1->save_progressive_seq = s->progressive_sequence;
1295
1296         /* low_delay may be forced, in this case we will have B-frames
1297          * that behave like P-frames. */
1298         avctx->has_b_frames = !s->low_delay;
1299
1300         if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1301             //MPEG-1 fps
1302             avctx->time_base.den = ff_mpeg12_frame_rate_tab[s->frame_rate_index].num;
1303             avctx->time_base.num = ff_mpeg12_frame_rate_tab[s->frame_rate_index].den;
1304             //MPEG-1 aspect
1305             avctx->sample_aspect_ratio = av_d2q(1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1306             avctx->ticks_per_frame=1;
1307         } else {//MPEG-2
1308         //MPEG-2 fps
1309             av_reduce(&s->avctx->time_base.den,
1310                       &s->avctx->time_base.num,
1311                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1312                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1313                       1 << 30);
1314             avctx->ticks_per_frame = 2;
1315             //MPEG-2 aspect
1316             if (s->aspect_ratio_info > 1) {
1317                 AVRational dar =
1318                     av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1319                                       (AVRational) {s1->pan_scan.width, s1->pan_scan.height}),
1320                              (AVRational) {s->width, s->height});
1321
1322                 // we ignore the spec here and guess a bit as reality does not match the spec, see for example
1323                 // res_change_ffmpeg_aspect.ts 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}) && av_cmp_q(dar, (AVRational) {16, 9}))) {
1327                     s->avctx->sample_aspect_ratio =
1328                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1329                                  (AVRational) {s->width, s->height});
1330                 } else {
1331                     s->avctx->sample_aspect_ratio =
1332                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1333                                  (AVRational) {s1->pan_scan.width, s1->pan_scan.height});
1334 //issue1613 4/3 16/9 -> 16/9
1335 //res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1336 //widescreen-issue562.mpg 4/3 16/9 -> 16/9
1337 //                    s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1338                     av_dlog(avctx, "A %d/%d\n",
1339                             ff_mpeg2_aspect[s->aspect_ratio_info].num, ff_mpeg2_aspect[s->aspect_ratio_info].den);
1340                     av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1341                             s->avctx->sample_aspect_ratio.den);
1342                 }
1343             } else {
1344                 s->avctx->sample_aspect_ratio =
1345                     ff_mpeg2_aspect[s->aspect_ratio_info];
1346             }
1347         } // MPEG-2
1348
1349         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1350         avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1351         // until then pix_fmt may be changed right after codec init
1352         if (avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT ||
1353             avctx->hwaccel || uses_vdpau(avctx))
1354             if (avctx->idct_algo == FF_IDCT_AUTO)
1355                 avctx->idct_algo = FF_IDCT_SIMPLE;
1356
1357         /* Quantization matrices may need reordering
1358          * if DCT permutation is changed. */
1359         memcpy(old_permutation, s->dsp.idct_permutation, 64 * sizeof(uint8_t));
1360
1361         if (ff_MPV_common_init(s) < 0)
1362             return -2;
1363
1364         quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->dsp.idct_permutation);
1365         quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->dsp.idct_permutation);
1366         quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->dsp.idct_permutation);
1367         quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->dsp.idct_permutation);
1368
1369         s1->mpeg_enc_ctx_allocated = 1;
1370     }
1371     return 0;
1372 }
1373
1374 static int mpeg1_decode_picture(AVCodecContext *avctx,
1375                                 const uint8_t *buf, 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 || s->pict_type == AV_PICTURE_TYPE_B) {
1391         s->full_pel[0] = get_bits1(&s->gb);
1392         f_code = get_bits(&s->gb, 3);
1393         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1394             return -1;
1395         f_code += !f_code;
1396         s->mpeg_f_code[0][0] = f_code;
1397         s->mpeg_f_code[0][1] = f_code;
1398     }
1399     if (s->pict_type == AV_PICTURE_TYPE_B) {
1400         s->full_pel[1] = get_bits1(&s->gb);
1401         f_code = get_bits(&s->gb, 3);
1402         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1403             return -1;
1404         f_code += !f_code;
1405         s->mpeg_f_code[1][0] = f_code;
1406         s->mpeg_f_code[1][1] = f_code;
1407     }
1408     s->current_picture.f.pict_type = s->pict_type;
1409     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1410
1411     if (avctx->debug & FF_DEBUG_PICT_INFO)
1412         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1413
1414     s->y_dc_scale = 8;
1415     s->c_dc_scale = 8;
1416     return 0;
1417 }
1418
1419 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1420 {
1421     MpegEncContext *s= &s1->mpeg_enc_ctx;
1422     int horiz_size_ext, vert_size_ext;
1423     int bit_rate_ext;
1424
1425     skip_bits(&s->gb, 1); /* profile and level esc*/
1426     s->avctx->profile       = get_bits(&s->gb, 3);
1427     s->avctx->level         = get_bits(&s->gb, 4);
1428     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1429     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1430     horiz_size_ext          = get_bits(&s->gb, 2);
1431     vert_size_ext           = get_bits(&s->gb, 2);
1432     s->width  |= (horiz_size_ext << 12);
1433     s->height |= (vert_size_ext  << 12);
1434     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1435     s->bit_rate += (bit_rate_ext << 18) * 400;
1436     skip_bits1(&s->gb); /* marker */
1437     s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1438
1439     s->low_delay = get_bits1(&s->gb);
1440     if (s->flags & CODEC_FLAG_LOW_DELAY)
1441         s->low_delay = 1;
1442
1443     s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1444     s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1445
1446     av_dlog(s->avctx, "sequence extension\n");
1447     s->codec_id      = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1448
1449     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1450         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1451                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1452
1453 }
1454
1455 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1456 {
1457     MpegEncContext *s = &s1->mpeg_enc_ctx;
1458     int color_description, w, h;
1459
1460     skip_bits(&s->gb, 3); /* video format */
1461     color_description = get_bits1(&s->gb);
1462     if (color_description) {
1463         s->avctx->color_primaries = get_bits(&s->gb, 8);
1464         s->avctx->color_trc       = get_bits(&s->gb, 8);
1465         s->avctx->colorspace      = get_bits(&s->gb, 8);
1466     }
1467     w = get_bits(&s->gb, 14);
1468     skip_bits(&s->gb, 1); //marker
1469     h = get_bits(&s->gb, 14);
1470     // remaining 3 bits are zero padding
1471
1472     s1->pan_scan.width  = 16 * w;
1473     s1->pan_scan.height = 16 * h;
1474
1475     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1476         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1477 }
1478
1479 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1480 {
1481     MpegEncContext *s = &s1->mpeg_enc_ctx;
1482     int i, nofco;
1483
1484     nofco = 1;
1485     if (s->progressive_sequence) {
1486         if (s->repeat_first_field) {
1487             nofco++;
1488             if (s->top_field_first)
1489                 nofco++;
1490         }
1491     } else {
1492         if (s->picture_structure == PICT_FRAME) {
1493             nofco++;
1494             if (s->repeat_first_field)
1495                 nofco++;
1496         }
1497     }
1498     for (i = 0; i < nofco; i++) {
1499         s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1500         skip_bits(&s->gb, 1); // marker
1501         s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1502         skip_bits(&s->gb, 1); // marker
1503     }
1504
1505     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1506         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1507                s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1508                s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1509                s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1510 }
1511
1512 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra)
1513 {
1514     int i;
1515
1516     for (i = 0; i < 64; i++) {
1517         int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1518         int v = get_bits(&s->gb, 8);
1519         if (v == 0) {
1520             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1521             return -1;
1522         }
1523         if (intra && i == 0 && v != 8) {
1524             av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1525             v = 8; // needed by pink.mpg / issue1046
1526         }
1527         matrix0[j] = v;
1528         if (matrix1)
1529             matrix1[j] = v;
1530     }
1531     return 0;
1532 }
1533
1534 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1535 {
1536     av_dlog(s->avctx, "matrix extension\n");
1537
1538     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1539     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1540     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL           , 1);
1541     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL           , 0);
1542 }
1543
1544 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1545 {
1546     MpegEncContext *s = &s1->mpeg_enc_ctx;
1547
1548     s->full_pel[0] = s->full_pel[1] = 0;
1549     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1550     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1551     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1552     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1553     if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1554         av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1555         if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1556             if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1557                 s->pict_type = AV_PICTURE_TYPE_I;
1558             else
1559                 s->pict_type = AV_PICTURE_TYPE_P;
1560         } else
1561             s->pict_type = AV_PICTURE_TYPE_B;
1562         s->current_picture.f.pict_type = s->pict_type;
1563         s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1564     }
1565     s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1566     s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1567     s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1568     s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1569
1570     s->intra_dc_precision         = get_bits(&s->gb, 2);
1571     s->picture_structure          = get_bits(&s->gb, 2);
1572     s->top_field_first            = get_bits1(&s->gb);
1573     s->frame_pred_frame_dct       = get_bits1(&s->gb);
1574     s->concealment_motion_vectors = get_bits1(&s->gb);
1575     s->q_scale_type               = get_bits1(&s->gb);
1576     s->intra_vlc_format           = get_bits1(&s->gb);
1577     s->alternate_scan             = get_bits1(&s->gb);
1578     s->repeat_first_field         = get_bits1(&s->gb);
1579     s->chroma_420_type            = get_bits1(&s->gb);
1580     s->progressive_frame          = get_bits1(&s->gb);
1581
1582
1583     if (s->alternate_scan) {
1584         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1585         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1586     } else {
1587         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1588         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1589     }
1590
1591     /* composite display not parsed */
1592     av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1593     av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1594     av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1595     av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1596     av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1597     av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1598     av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1599     av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1600     av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1601 }
1602
1603 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1604 {
1605     AVCodecContext *avctx = s->avctx;
1606     Mpeg1Context *s1 = (Mpeg1Context*)s;
1607
1608     /* start frame decoding */
1609     if (s->first_field || s->picture_structure == PICT_FRAME) {
1610         if (ff_MPV_frame_start(s, avctx) < 0)
1611             return -1;
1612
1613         ff_mpeg_er_frame_start(s);
1614
1615         /* first check if we must repeat the frame */
1616         s->current_picture_ptr->f.repeat_pict = 0;
1617         if (s->repeat_first_field) {
1618             if (s->progressive_sequence) {
1619                 if (s->top_field_first)
1620                     s->current_picture_ptr->f.repeat_pict = 4;
1621                 else
1622                     s->current_picture_ptr->f.repeat_pict = 2;
1623             } else if (s->progressive_frame) {
1624                 s->current_picture_ptr->f.repeat_pict = 1;
1625             }
1626         }
1627
1628         *s->current_picture_ptr->f.pan_scan = s1->pan_scan;
1629
1630         if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1631             ff_thread_finish_setup(avctx);
1632     } else { // second field
1633         int i;
1634
1635         if (!s->current_picture_ptr) {
1636             av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1637             return -1;
1638         }
1639
1640         if (s->avctx->hwaccel &&
1641             (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1642             if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1643                 av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode first field\n");
1644         }
1645
1646         for (i = 0; i < 4; i++) {
1647             s->current_picture.f.data[i] = s->current_picture_ptr->f.data[i];
1648             if (s->picture_structure == PICT_BOTTOM_FIELD) {
1649                 s->current_picture.f.data[i] += s->current_picture_ptr->f.linesize[i];
1650             }
1651         }
1652     }
1653
1654     if (avctx->hwaccel) {
1655         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1656             return -1;
1657     }
1658
1659 // MPV_frame_start will call this function too,
1660 // but we need to call it on every field
1661     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1662         if (ff_xvmc_field_start(s, avctx) < 0)
1663             return -1;
1664
1665     return 0;
1666 }
1667
1668 #define DECODE_SLICE_ERROR -1
1669 #define DECODE_SLICE_OK     0
1670
1671 /**
1672  * Decode a slice.
1673  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1674  * @return DECODE_SLICE_ERROR if the slice is damaged,
1675  *         DECODE_SLICE_OK if this slice is OK
1676  */
1677 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1678                              const uint8_t **buf, int buf_size)
1679 {
1680     AVCodecContext *avctx = s->avctx;
1681     const int lowres      = s->avctx->lowres;
1682     const int field_pic   = s->picture_structure != PICT_FRAME;
1683
1684     s->resync_mb_x =
1685     s->resync_mb_y = -1;
1686
1687     av_assert0(mb_y < s->mb_height);
1688
1689     init_get_bits(&s->gb, *buf, buf_size * 8);
1690     if(s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1691         skip_bits(&s->gb, 3);
1692
1693     ff_mpeg1_clean_buffers(s);
1694     s->interlaced_dct = 0;
1695
1696     s->qscale = get_qscale(s);
1697
1698     if (s->qscale == 0) {
1699         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1700         return -1;
1701     }
1702
1703     /* extra slice info */
1704     while (get_bits1(&s->gb) != 0) {
1705         skip_bits(&s->gb, 8);
1706     }
1707
1708     s->mb_x = 0;
1709
1710     if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1711         skip_bits1(&s->gb);
1712     } else {
1713         while (get_bits_left(&s->gb) > 0) {
1714             int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1715             if (code < 0) {
1716                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1717                 return -1;
1718             }
1719             if (code >= 33) {
1720                 if (code == 33) {
1721                     s->mb_x += 33;
1722                 }
1723                 /* otherwise, stuffing, nothing to do */
1724             } else {
1725                 s->mb_x += code;
1726                 break;
1727             }
1728         }
1729     }
1730
1731     if (s->mb_x >= (unsigned)s->mb_width) {
1732         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1733         return -1;
1734     }
1735
1736     if (avctx->hwaccel) {
1737         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1738         int start_code = -1;
1739         buf_end = avpriv_mpv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1740         if (buf_end < *buf + buf_size)
1741             buf_end -= 4;
1742         s->mb_y = mb_y;
1743         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1744             return DECODE_SLICE_ERROR;
1745         *buf = buf_end;
1746         return DECODE_SLICE_OK;
1747     }
1748
1749     s->resync_mb_x = s->mb_x;
1750     s->resync_mb_y = s->mb_y = mb_y;
1751     s->mb_skip_run = 0;
1752     ff_init_block_index(s);
1753
1754     if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1755         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1756              av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%2d%2d%2d%2d %s %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n",
1757                     s->qscale, s->mpeg_f_code[0][0], s->mpeg_f_code[0][1], s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1758                     s->pict_type == AV_PICTURE_TYPE_I ? "I" : (s->pict_type == AV_PICTURE_TYPE_P ? "P" : (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1759                     s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1760                     s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1761                     s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1762         }
1763     }
1764
1765     for (;;) {
1766         // If 1, we memcpy blocks in xvmcvideo.
1767         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1768             ff_xvmc_init_block(s); // set s->block
1769
1770         if (mpeg_decode_mb(s, s->block) < 0)
1771             return -1;
1772
1773         if (s->current_picture.f.motion_val[0] && !s->encoding) { // note motion_val is normally NULL unless we want to extract the MVs
1774             const int wrap = s->b8_stride;
1775             int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1776             int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1777             int motion_x, motion_y, dir, i;
1778
1779             for (i = 0; i < 2; i++) {
1780                 for (dir = 0; dir < 2; dir++) {
1781                     if (s->mb_intra || (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1782                         motion_x = motion_y = 0;
1783                     } else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1784                         motion_x = s->mv[dir][0][0];
1785                         motion_y = s->mv[dir][0][1];
1786                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1787                         motion_x = s->mv[dir][i][0];
1788                         motion_y = s->mv[dir][i][1];
1789                     }
1790
1791                     s->current_picture.f.motion_val[dir][xy    ][0] = motion_x;
1792                     s->current_picture.f.motion_val[dir][xy    ][1] = motion_y;
1793                     s->current_picture.f.motion_val[dir][xy + 1][0] = motion_x;
1794                     s->current_picture.f.motion_val[dir][xy + 1][1] = motion_y;
1795                     s->current_picture.f.ref_index [dir][b8_xy    ] =
1796                     s->current_picture.f.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1797                     av_assert2(s->field_select[dir][i] == 0 || s->field_select[dir][i] == 1);
1798                 }
1799                 xy += wrap;
1800                 b8_xy +=2;
1801             }
1802         }
1803
1804         s->dest[0] += 16 >> lowres;
1805         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1806         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1807
1808         ff_MPV_decode_mb(s, s->block);
1809
1810         if (++s->mb_x >= s->mb_width) {
1811             const int mb_size = 16 >> s->avctx->lowres;
1812
1813             ff_mpeg_draw_horiz_band(s, mb_size*(s->mb_y >> field_pic), mb_size);
1814             ff_MPV_report_decode_progress(s);
1815
1816             s->mb_x = 0;
1817             s->mb_y += 1 << field_pic;
1818
1819             if (s->mb_y >= s->mb_height) {
1820                 int left   = get_bits_left(&s->gb);
1821                 int is_d10 = s->chroma_format == 2 && s->pict_type == AV_PICTURE_TYPE_I && avctx->profile == 0 && avctx->level == 5
1822                              && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1823                              && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1824
1825                 if (left >= 32 && !is_d10) {
1826                     GetBitContext gb = s->gb;
1827                     align_get_bits(&gb);
1828                     if (show_bits(&gb, 24) == 0x060E2B) {
1829                         av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1830                         is_d10 = 1;
1831                     }
1832                 }
1833
1834                 if (left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1835                     || ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1836                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1837                     return -1;
1838                 } else
1839                     goto eos;
1840             }
1841
1842             ff_init_block_index(s);
1843         }
1844
1845         /* skip mb handling */
1846         if (s->mb_skip_run == -1) {
1847             /* read increment again */
1848             s->mb_skip_run = 0;
1849             for (;;) {
1850                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1851                 if (code < 0) {
1852                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1853                     return -1;
1854                 }
1855                 if (code >= 33) {
1856                     if (code == 33) {
1857                         s->mb_skip_run += 33;
1858                     } else if (code == 35) {
1859                         if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1860                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1861                             return -1;
1862                         }
1863                         goto eos; /* end of slice */
1864                     }
1865                     /* otherwise, stuffing, nothing to do */
1866                 } else {
1867                     s->mb_skip_run += code;
1868                     break;
1869                 }
1870             }
1871             if (s->mb_skip_run) {
1872                 int i;
1873                 if (s->pict_type == AV_PICTURE_TYPE_I) {
1874                     av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1875                     return -1;
1876                 }
1877
1878                 /* skip mb */
1879                 s->mb_intra = 0;
1880                 for (i = 0; i < 12; i++)
1881                     s->block_last_index[i] = -1;
1882                 if (s->picture_structure == PICT_FRAME)
1883                     s->mv_type = MV_TYPE_16X16;
1884                 else
1885                     s->mv_type = MV_TYPE_FIELD;
1886                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1887                     /* if P type, zero motion vector is implied */
1888                     s->mv_dir             = MV_DIR_FORWARD;
1889                     s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1890                     s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1891                     s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1892                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1893                 } else {
1894                     /* if B type, reuse previous vectors and directions */
1895                     s->mv[0][0][0] = s->last_mv[0][0][0];
1896                     s->mv[0][0][1] = s->last_mv[0][0][1];
1897                     s->mv[1][0][0] = s->last_mv[1][0][0];
1898                     s->mv[1][0][1] = s->last_mv[1][0][1];
1899                 }
1900             }
1901         }
1902     }
1903 eos: // end of slice
1904     *buf += (get_bits_count(&s->gb)-1)/8;
1905     av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1906     return 0;
1907 }
1908
1909 static int slice_decode_thread(AVCodecContext *c, void *arg)
1910 {
1911     MpegEncContext *s   = *(void**)arg;
1912     const uint8_t *buf  = s->gb.buffer;
1913     int mb_y            = s->start_mb_y;
1914     const int field_pic = s->picture_structure != PICT_FRAME;
1915
1916     s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1917
1918     for (;;) {
1919         uint32_t start_code;
1920         int ret;
1921
1922         ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1923         emms_c();
1924         av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1925                 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1926                 s->start_mb_y, s->end_mb_y, s->er.error_count);
1927         if (ret < 0) {
1928             if (c->err_recognition & AV_EF_EXPLODE)
1929                 return ret;
1930             if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1931                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
1932         } else {
1933             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_AC_END | ER_DC_END | ER_MV_END);
1934         }
1935
1936         if (s->mb_y == s->end_mb_y)
1937             return 0;
1938
1939         start_code = -1;
1940         buf = avpriv_mpv_find_start_code(buf, s->gb.buffer_end, &start_code);
1941         mb_y= start_code - SLICE_MIN_START_CODE;
1942         if(s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1943             mb_y += (*buf&0xE0)<<2;
1944         mb_y <<= field_pic;
1945         if (s->picture_structure == PICT_BOTTOM_FIELD)
1946             mb_y++;
1947         if (mb_y < 0 || mb_y >= s->end_mb_y)
1948             return -1;
1949     }
1950 }
1951
1952 /**
1953  * Handle slice ends.
1954  * @return 1 if it seems to be the last slice
1955  */
1956 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1957 {
1958     Mpeg1Context *s1 = avctx->priv_data;
1959     MpegEncContext *s = &s1->mpeg_enc_ctx;
1960
1961     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1962         return 0;
1963
1964     if (s->avctx->hwaccel) {
1965         if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1966             av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1967     }
1968
1969     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1970         ff_xvmc_field_end(s);
1971
1972     /* end of slice reached */
1973     if (/*s->mb_y << field_pic == s->mb_height &&*/ !s->first_field && !s->first_slice) {
1974         /* end of image */
1975
1976         s->current_picture_ptr->f.qscale_type = FF_QSCALE_TYPE_MPEG2;
1977
1978         ff_er_frame_end(&s->er);
1979
1980         ff_MPV_frame_end(s);
1981
1982         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
1983             *pict = s->current_picture_ptr->f;
1984             ff_print_debug_info(s, pict);
1985         } else {
1986             if (avctx->active_thread_type & FF_THREAD_FRAME)
1987                 s->picture_number++;
1988             /* latency of 1 frame for I- and P-frames */
1989             /* XXX: use another variable than picture_number */
1990             if (s->last_picture_ptr != NULL) {
1991                 *pict = s->last_picture_ptr->f;
1992                  ff_print_debug_info(s, pict);
1993             }
1994         }
1995
1996         return 1;
1997     } else {
1998         return 0;
1999     }
2000 }
2001
2002 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2003                                  const uint8_t *buf, int buf_size)
2004 {
2005     Mpeg1Context *s1 = avctx->priv_data;
2006     MpegEncContext *s = &s1->mpeg_enc_ctx;
2007     int width, height;
2008     int i, v, j;
2009
2010     init_get_bits(&s->gb, buf, buf_size*8);
2011
2012     width  = get_bits(&s->gb, 12);
2013     height = get_bits(&s->gb, 12);
2014     s->aspect_ratio_info = get_bits(&s->gb, 4);
2015     if (s->aspect_ratio_info == 0) {
2016         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2017         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2018             return -1;
2019     }
2020     s->frame_rate_index = get_bits(&s->gb, 4);
2021     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2022         return -1;
2023     s->bit_rate = get_bits(&s->gb, 18) * 400;
2024     if (get_bits1(&s->gb) == 0) /* marker */
2025         return -1;
2026     s->width  = width;
2027     s->height = height;
2028
2029     s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2030     skip_bits(&s->gb, 1);
2031
2032     /* get matrix */
2033     if (get_bits1(&s->gb)) {
2034         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2035     } else {
2036         for (i = 0; i < 64; i++) {
2037             j = s->dsp.idct_permutation[i];
2038             v = ff_mpeg1_default_intra_matrix[i];
2039             s->intra_matrix[j]        = v;
2040             s->chroma_intra_matrix[j] = v;
2041         }
2042     }
2043     if (get_bits1(&s->gb)) {
2044         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2045     } else {
2046         for (i = 0; i < 64; i++) {
2047             int j = s->dsp.idct_permutation[i];
2048             v = ff_mpeg1_default_non_intra_matrix[i];
2049             s->inter_matrix[j]        = v;
2050             s->chroma_inter_matrix[j] = v;
2051         }
2052     }
2053
2054     if (show_bits(&s->gb, 23) != 0) {
2055         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2056         return -1;
2057     }
2058
2059     /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2060     s->progressive_sequence = 1;
2061     s->progressive_frame    = 1;
2062     s->picture_structure    = PICT_FRAME;
2063     s->first_field          = 0;
2064     s->frame_pred_frame_dct = 1;
2065     s->chroma_format        = 1;
2066     s->codec_id             = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2067     s->out_format           = FMT_MPEG1;
2068     s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2069     if (s->flags & CODEC_FLAG_LOW_DELAY)
2070         s->low_delay = 1;
2071
2072     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2073         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2074                s->avctx->rc_buffer_size, s->bit_rate);
2075
2076     return 0;
2077 }
2078
2079 static int vcr2_init_sequence(AVCodecContext *avctx)
2080 {
2081     Mpeg1Context *s1 = avctx->priv_data;
2082     MpegEncContext *s = &s1->mpeg_enc_ctx;
2083     int i, v;
2084
2085     /* start new MPEG-1 context decoding */
2086     s->out_format = FMT_MPEG1;
2087     if (s1->mpeg_enc_ctx_allocated) {
2088         ff_MPV_common_end(s);
2089     }
2090     s->width  = avctx->coded_width;
2091     s->height = avctx->coded_height;
2092     avctx->has_b_frames = 0; // true?
2093     s->low_delay = 1;
2094
2095     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2096     avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2097
2098     if (avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel || uses_vdpau(avctx))
2099         if (avctx->idct_algo == FF_IDCT_AUTO)
2100             avctx->idct_algo = FF_IDCT_SIMPLE;
2101
2102     if (ff_MPV_common_init(s) < 0)
2103         return -1;
2104     s1->mpeg_enc_ctx_allocated = 1;
2105
2106     for (i = 0; i < 64; i++) {
2107         int j = s->dsp.idct_permutation[i];
2108         v = ff_mpeg1_default_intra_matrix[i];
2109         s->intra_matrix[j]        = v;
2110         s->chroma_intra_matrix[j] = v;
2111
2112         v = ff_mpeg1_default_non_intra_matrix[i];
2113         s->inter_matrix[j]        = v;
2114         s->chroma_inter_matrix[j] = v;
2115     }
2116
2117     s->progressive_sequence  = 1;
2118     s->progressive_frame     = 1;
2119     s->picture_structure     = PICT_FRAME;
2120     s->first_field           = 0;
2121     s->frame_pred_frame_dct  = 1;
2122     s->chroma_format         = 1;
2123     if (s->codec_tag == AV_RL32("BW10")) {
2124         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2125     } else {
2126         exchange_uv(s); // common init reset pblocks, so we swap them here
2127         s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2128         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2129     }
2130     s1->save_width           = s->width;
2131     s1->save_height          = s->height;
2132     s1->save_progressive_seq = s->progressive_sequence;
2133     return 0;
2134 }
2135
2136
2137 static void mpeg_decode_user_data(AVCodecContext *avctx,
2138                                   const uint8_t *p, int buf_size)
2139 {
2140     Mpeg1Context *s = avctx->priv_data;
2141     const uint8_t *buf_end = p + buf_size;
2142
2143     if(buf_size > 29){
2144         int i;
2145         for(i=0; i<20; i++)
2146             if(!memcmp(p+i, "\0TMPGEXS\0", 9)){
2147                 s->tmpgexs= 1;
2148             }
2149
2150 /*        for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2151             av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2152         }
2153             av_log(avctx, AV_LOG_ERROR, "\n");*/
2154     }
2155
2156     /* we parse the DTG active format information */
2157     if (buf_end - p >= 5 &&
2158         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2159         int flags = p[4];
2160         p += 5;
2161         if (flags & 0x80) {
2162             /* skip event id */
2163             p += 2;
2164         }
2165         if (flags & 0x40) {
2166             if (buf_end - p < 1)
2167                 return;
2168             avctx->dtg_active_format = p[0] & 0x0f;
2169         }
2170     }
2171 }
2172
2173 static void mpeg_decode_gop(AVCodecContext *avctx,
2174                             const uint8_t *buf, int buf_size)
2175 {
2176     Mpeg1Context *s1  = avctx->priv_data;
2177     MpegEncContext *s = &s1->mpeg_enc_ctx;
2178     int broken_link;
2179     int64_t tc;
2180
2181     init_get_bits(&s->gb, buf, buf_size*8);
2182
2183     tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2184
2185     s->closed_gop = get_bits1(&s->gb);
2186     /*broken_link indicate that after editing the
2187       reference frames of the first B-Frames after GOP I-Frame
2188       are missing (open gop)*/
2189     broken_link = get_bits1(&s->gb);
2190
2191     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2192         char tcbuf[AV_TIMECODE_STR_SIZE];
2193         av_timecode_make_mpeg_tc_string(tcbuf, tc);
2194         av_log(s->avctx, AV_LOG_DEBUG,
2195                "GOP (%s) closed_gop=%d broken_link=%d\n",
2196                tcbuf, s->closed_gop, broken_link);
2197     }
2198 }
2199 /**
2200  * Find the end of the current frame in the bitstream.
2201  * @return the position of the first byte of the next frame, or -1
2202  */
2203 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2204 {
2205     int i;
2206     uint32_t state = pc->state;
2207
2208     /* EOF considered as end of frame */
2209     if (buf_size == 0)
2210         return 0;
2211
2212 /*
2213  0  frame start         -> 1/4
2214  1  first_SEQEXT        -> 0/2
2215  2  first field start   -> 3/0
2216  3  second_SEQEXT       -> 2/0
2217  4  searching end
2218 */
2219
2220     for (i = 0; i < buf_size; i++) {
2221         av_assert1(pc->frame_start_found >= 0 && pc->frame_start_found <= 4);
2222         if (pc->frame_start_found & 1) {
2223             if (state == EXT_START_CODE && (buf[i] & 0xF0) != 0x80)
2224                 pc->frame_start_found--;
2225             else if (state == EXT_START_CODE + 2) {
2226                 if ((buf[i] & 3) == 3)
2227                     pc->frame_start_found = 0;
2228                 else
2229                     pc->frame_start_found = (pc->frame_start_found + 1) & 3;
2230             }
2231             state++;
2232         } else {
2233             i = avpriv_mpv_find_start_code(buf + i, buf + buf_size, &state) - buf - 1;
2234             if (pc->frame_start_found == 0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE) {
2235                 i++;
2236                 pc->frame_start_found = 4;
2237             }
2238             if (state == SEQ_END_CODE) {
2239                 pc->frame_start_found = 0;
2240                 pc->state=-1;
2241                 return i+1;
2242             }
2243             if (pc->frame_start_found == 2 && state == SEQ_START_CODE)
2244                 pc->frame_start_found = 0;
2245             if (pc->frame_start_found  < 4 && state == EXT_START_CODE)
2246                 pc->frame_start_found++;
2247             if (pc->frame_start_found == 4 && (state & 0xFFFFFF00) == 0x100) {
2248                 if (state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE) {
2249                     pc->frame_start_found = 0;
2250                     pc->state             = -1;
2251                     return i - 3;
2252                 }
2253             }
2254             if (pc->frame_start_found == 0 && s && state == PICTURE_START_CODE) {
2255                 ff_fetch_timestamp(s, i - 3, 1);
2256             }
2257         }
2258     }
2259     pc->state = state;
2260     return END_NOT_FOUND;
2261 }
2262
2263 static int decode_chunks(AVCodecContext *avctx,
2264                          AVFrame *picture, int *got_output,
2265                          const uint8_t *buf, int buf_size)
2266 {
2267     Mpeg1Context *s = avctx->priv_data;
2268     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2269     const uint8_t *buf_ptr = buf;
2270     const uint8_t *buf_end = buf + buf_size;
2271     int ret, input_size;
2272     int last_code = 0;
2273     int picture_start_code_seen = 0;
2274
2275     for (;;) {
2276         /* find next start code */
2277         uint32_t start_code = -1;
2278         buf_ptr = avpriv_mpv_find_start_code(buf_ptr, buf_end, &start_code);
2279         if (start_code > 0x1ff) {
2280             if (s2->pict_type != AV_PICTURE_TYPE_B || avctx->skip_frame <= AVDISCARD_DEFAULT) {
2281                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2282                     int i;
2283                     av_assert0(avctx->thread_count > 1);
2284
2285                     avctx->execute(avctx, slice_decode_thread,  &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
2286                     for (i = 0; i < s->slice_count; i++)
2287                         s2->er.error_count += s2->thread_context[i]->er.error_count;
2288                 }
2289
2290                 if (CONFIG_VDPAU && uses_vdpau(avctx))
2291                     ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2292
2293
2294                 if (slice_end(avctx, picture)) {
2295                     if (s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2296                         *got_output = 1;
2297                 }
2298             }
2299             s2->pict_type = 0;
2300             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2301         }
2302
2303         input_size = buf_end - buf_ptr;
2304
2305         if (avctx->debug & FF_DEBUG_STARTCODE) {
2306             av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2307         }
2308
2309         /* prepare data for next start code */
2310         switch (start_code) {
2311         case SEQ_START_CODE:
2312             if (last_code == 0) {
2313                 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2314                 if(buf != avctx->extradata)
2315                     s->sync=1;
2316             } else {
2317                 av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2318                 if (avctx->err_recognition & AV_EF_EXPLODE)
2319                     return AVERROR_INVALIDDATA;
2320             }
2321             break;
2322
2323         case PICTURE_START_CODE:
2324             if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2325                /* If it's a frame picture, there can't be more than one picture header.
2326                   Yet, it does happen and we need to handle it. */
2327                av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2328                break;
2329             }
2330             picture_start_code_seen = 1;
2331
2332             if (s2->width <= 0 || s2->height <= 0) {
2333                 av_log(avctx, AV_LOG_ERROR, "%dx%d is invalid\n", s2->width, s2->height);
2334                 return AVERROR_INVALIDDATA;
2335             }
2336
2337             if(s->tmpgexs){
2338                 s2->intra_dc_precision= 3;
2339                 s2->intra_matrix[0]= 1;
2340             }
2341             if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) && s->slice_count) {
2342                 int i;
2343
2344                 avctx->execute(avctx, slice_decode_thread,
2345                                s2->thread_context, NULL,
2346                                s->slice_count, sizeof(void*));
2347                 for (i = 0; i < s->slice_count; i++)
2348                     s2->er.error_count += s2->thread_context[i]->er.error_count;
2349                 s->slice_count = 0;
2350             }
2351             if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2352                 ret = mpeg_decode_postinit(avctx);
2353                 if (ret < 0) {
2354                     av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
2355                     return ret;
2356                 }
2357
2358                 /* we have a complete image: we try to decompress it */
2359                 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2360                     s2->pict_type = 0;
2361                 s2->first_slice = 1;
2362                 last_code = PICTURE_START_CODE;
2363             } else {
2364                 av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
2365                 if (avctx->err_recognition & AV_EF_EXPLODE)
2366                     return AVERROR_INVALIDDATA;
2367             }
2368             break;
2369         case EXT_START_CODE:
2370             init_get_bits(&s2->gb, buf_ptr, input_size*8);
2371
2372             switch (get_bits(&s2->gb, 4)) {
2373             case 0x1:
2374                 if (last_code == 0) {
2375                 mpeg_decode_sequence_extension(s);
2376                 } else {
2377                     av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
2378                     if (avctx->err_recognition & AV_EF_EXPLODE)
2379                         return AVERROR_INVALIDDATA;
2380                 }
2381                 break;
2382             case 0x2:
2383                 mpeg_decode_sequence_display_extension(s);
2384                 break;
2385             case 0x3:
2386                 mpeg_decode_quant_matrix_extension(s2);
2387                 break;
2388             case 0x7:
2389                 mpeg_decode_picture_display_extension(s);
2390                 break;
2391             case 0x8:
2392                 if (last_code == PICTURE_START_CODE) {
2393                     mpeg_decode_picture_coding_extension(s);
2394                 } else {
2395                     av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
2396                     if (avctx->err_recognition & AV_EF_EXPLODE)
2397                         return AVERROR_INVALIDDATA;
2398                 }
2399                 break;
2400             }
2401             break;
2402         case USER_START_CODE:
2403             mpeg_decode_user_data(avctx, buf_ptr, input_size);
2404             break;
2405         case GOP_START_CODE:
2406             if (last_code == 0) {
2407                 s2->first_field=0;
2408                 mpeg_decode_gop(avctx, buf_ptr, input_size);
2409                 s->sync=1;
2410             } else {
2411                 av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
2412                 if (avctx->err_recognition & AV_EF_EXPLODE)
2413                     return AVERROR_INVALIDDATA;
2414             }
2415             break;
2416         default:
2417             if (start_code >= SLICE_MIN_START_CODE &&
2418                 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2419
2420                 if (s2->progressive_sequence && !s2->progressive_frame) {
2421                     s2->progressive_frame = 1;
2422                     av_log(s2->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
2423                 }
2424
2425                 if (s2->picture_structure == 0 || (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2426                     av_log(s2->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s2->picture_structure);
2427                     s2->picture_structure = PICT_FRAME;
2428                 }
2429
2430                 if (s2->progressive_sequence && !s2->frame_pred_frame_dct) {
2431                     av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2432                 }
2433
2434                 if (s2->picture_structure == PICT_FRAME) {
2435                     s2->first_field = 0;
2436                     s2->v_edge_pos  = 16 * s2->mb_height;
2437                 } else {
2438                     s2->first_field ^= 1;
2439                     s2->v_edge_pos   = 8 * s2->mb_height;
2440                     memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2441                 }
2442             }
2443             if (start_code >= SLICE_MIN_START_CODE &&
2444                 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2445                 const int field_pic = s2->picture_structure != PICT_FRAME;
2446                 int mb_y = start_code - SLICE_MIN_START_CODE;
2447                 last_code = SLICE_MIN_START_CODE;
2448                 if(s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2449                     mb_y += (*buf_ptr&0xE0)<<2;
2450
2451                 mb_y <<= field_pic;
2452                 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2453                     mb_y++;
2454
2455                 if (mb_y >= s2->mb_height) {
2456                     av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2457                     return -1;
2458                 }
2459
2460                 if (s2->last_picture_ptr == NULL) {
2461                 /* Skip B-frames if we do not have reference frames and gop is not closed */
2462                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
2463                         if (!s2->closed_gop)
2464                             break;
2465                     }
2466                 }
2467                 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
2468                     s->sync=1;
2469                 if (s2->next_picture_ptr == NULL) {
2470                 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2471                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) break;
2472                 }
2473                 if ((avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type == AV_PICTURE_TYPE_B) ||
2474                     (avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type != AV_PICTURE_TYPE_I) ||
2475                      avctx->skip_frame >= AVDISCARD_ALL)
2476                     break;
2477
2478                 if (!s->mpeg_enc_ctx_allocated)
2479                     break;
2480
2481                 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2482                     if (mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2483                         break;
2484                 }
2485
2486                 if (!s2->pict_type) {
2487                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2488                     if (avctx->err_recognition & AV_EF_EXPLODE)
2489                         return AVERROR_INVALIDDATA;
2490                     break;
2491                 }
2492
2493                 if (s2->first_slice) {
2494                     s2->first_slice = 0;
2495                     if (mpeg_field_start(s2, buf, buf_size) < 0)
2496                         return -1;
2497                 }
2498                 if (!s2->current_picture_ptr) {
2499                     av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2500                     return AVERROR_INVALIDDATA;
2501                 }
2502
2503                 if (uses_vdpau(avctx)) {
2504                     s->slice_count++;
2505                     break;
2506                 }
2507
2508                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2509                     int threshold = (s2->mb_height * s->slice_count +
2510                                      s2->slice_context_count / 2) /
2511                                     s2->slice_context_count;
2512                     av_assert0(avctx->thread_count > 1);
2513                     if (threshold <= mb_y) {
2514                         MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2515
2516                         thread_context->start_mb_y = mb_y;
2517                         thread_context->end_mb_y   = s2->mb_height;
2518                         if (s->slice_count) {
2519                             s2->thread_context[s->slice_count-1]->end_mb_y = mb_y;
2520                             ret = ff_update_duplicate_context(thread_context,
2521                                                               s2);
2522                             if (ret < 0)
2523                                 return ret;
2524                         }
2525                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2526                         s->slice_count++;
2527                     }
2528                     buf_ptr += 2; // FIXME add minimum number of bytes per slice
2529                 } else {
2530                     ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2531                     emms_c();
2532
2533                     if (ret < 0) {
2534                         if (avctx->err_recognition & AV_EF_EXPLODE)
2535                             return ret;
2536                         if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2537                             ff_er_add_slice(&s2->er, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2538                     } else {
2539                         ff_er_add_slice(&s2->er, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x-1, s2->mb_y, ER_AC_END | ER_DC_END | ER_MV_END);
2540                     }
2541                 }
2542             }
2543             break;
2544         }
2545     }
2546 }
2547
2548 static int mpeg_decode_frame(AVCodecContext *avctx,
2549                              void *data, int *got_output,
2550                              AVPacket *avpkt)
2551 {
2552     const uint8_t *buf = avpkt->data;
2553     int ret;
2554     int buf_size = avpkt->size;
2555     Mpeg1Context *s = avctx->priv_data;
2556     AVFrame *picture = data;
2557     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2558     av_dlog(avctx, "fill_buffer\n");
2559
2560     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2561         /* special case for last picture */
2562         if (s2->low_delay == 0 && s2->next_picture_ptr) {
2563             *picture = s2->next_picture_ptr->f;
2564             s2->next_picture_ptr = NULL;
2565
2566             *got_output = 1;
2567         }
2568         return buf_size;
2569     }
2570
2571     if (s2->flags & CODEC_FLAG_TRUNCATED) {
2572         int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2573
2574         if (ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0)
2575             return buf_size;
2576     }
2577
2578     s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2579     if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2580                                            || s2->codec_tag == AV_RL32("BW10")
2581                                           ))
2582         vcr2_init_sequence(avctx);
2583
2584     s->slice_count = 0;
2585
2586     if (avctx->extradata && !s->extradata_decoded) {
2587         ret = decode_chunks(avctx, picture, got_output, avctx->extradata, avctx->extradata_size);
2588         if(*got_output) {
2589             av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2590             *got_output = 0;
2591         }
2592         s->extradata_decoded = 1;
2593         if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2594             s2->current_picture_ptr = NULL;
2595             return ret;
2596         }
2597     }
2598
2599     ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2600     if (ret<0 || *got_output)
2601         s2->current_picture_ptr = NULL;
2602
2603     return ret;
2604 }
2605
2606
2607 static void flush(AVCodecContext *avctx)
2608 {
2609     Mpeg1Context *s = avctx->priv_data;
2610
2611     s->sync=0;
2612
2613     ff_mpeg_flush(avctx);
2614 }
2615
2616 static int mpeg_decode_end(AVCodecContext *avctx)
2617 {
2618     Mpeg1Context *s = avctx->priv_data;
2619
2620     if (s->mpeg_enc_ctx_allocated)
2621         ff_MPV_common_end(&s->mpeg_enc_ctx);
2622     return 0;
2623 }
2624
2625 static const AVProfile mpeg2_video_profiles[] = {
2626     { FF_PROFILE_MPEG2_422,          "4:2:2"              },
2627     { FF_PROFILE_MPEG2_HIGH,         "High"               },
2628     { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
2629     { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
2630     { FF_PROFILE_MPEG2_MAIN,         "Main"               },
2631     { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
2632     { FF_PROFILE_RESERVED,           "Reserved"           },
2633     { FF_PROFILE_RESERVED,           "Reserved"           },
2634     { FF_PROFILE_UNKNOWN },
2635 };
2636
2637
2638 AVCodec ff_mpeg1video_decoder = {
2639     .name                  = "mpeg1video",
2640     .type                  = AVMEDIA_TYPE_VIDEO,
2641     .id                    = AV_CODEC_ID_MPEG1VIDEO,
2642     .priv_data_size        = sizeof(Mpeg1Context),
2643     .init                  = mpeg_decode_init,
2644     .close                 = mpeg_decode_end,
2645     .decode                = mpeg_decode_frame,
2646     .capabilities          = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2647                              CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2648                              CODEC_CAP_SLICE_THREADS,
2649     .flush                 = flush,
2650     .max_lowres            = 3,
2651     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2652     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2653 };
2654
2655 AVCodec ff_mpeg2video_decoder = {
2656     .name           = "mpeg2video",
2657     .type           = AVMEDIA_TYPE_VIDEO,
2658     .id             = AV_CODEC_ID_MPEG2VIDEO,
2659     .priv_data_size = sizeof(Mpeg1Context),
2660     .init           = mpeg_decode_init,
2661     .close          = mpeg_decode_end,
2662     .decode         = mpeg_decode_frame,
2663     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2664                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2665                       CODEC_CAP_SLICE_THREADS,
2666     .flush          = flush,
2667     .max_lowres     = 3,
2668     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2669     .profiles       = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2670 };
2671
2672 //legacy decoder
2673 AVCodec ff_mpegvideo_decoder = {
2674     .name           = "mpegvideo",
2675     .type           = AVMEDIA_TYPE_VIDEO,
2676     .id             = AV_CODEC_ID_MPEG2VIDEO,
2677     .priv_data_size = sizeof(Mpeg1Context),
2678     .init           = mpeg_decode_init,
2679     .close          = mpeg_decode_end,
2680     .decode         = mpeg_decode_frame,
2681     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2682     .flush          = flush,
2683     .max_lowres     = 3,
2684     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2685 };
2686
2687 #if CONFIG_MPEG_XVMC_DECODER
2688 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2689 {
2690     if (avctx->active_thread_type & FF_THREAD_SLICE)
2691         return -1;
2692     if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2693         return -1;
2694     if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2695         av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2696     }
2697     mpeg_decode_init(avctx);
2698
2699     avctx->pix_fmt           = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2700     avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2701
2702     return 0;
2703 }
2704
2705 AVCodec ff_mpeg_xvmc_decoder = {
2706     .name           = "mpegvideo_xvmc",
2707     .type           = AVMEDIA_TYPE_VIDEO,
2708     .id             = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2709     .priv_data_size = sizeof(Mpeg1Context),
2710     .init           = mpeg_mc_decode_init,
2711     .close          = mpeg_decode_end,
2712     .decode         = mpeg_decode_frame,
2713     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2714                       CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2715     .flush          = flush,
2716     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2717 };
2718
2719 #endif
2720
2721 #if CONFIG_MPEG_VDPAU_DECODER
2722 AVCodec ff_mpeg_vdpau_decoder = {
2723     .name           = "mpegvideo_vdpau",
2724     .type           = AVMEDIA_TYPE_VIDEO,
2725     .id             = AV_CODEC_ID_MPEG2VIDEO,
2726     .priv_data_size = sizeof(Mpeg1Context),
2727     .init           = mpeg_decode_init,
2728     .close          = mpeg_decode_end,
2729     .decode         = mpeg_decode_frame,
2730     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2731                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2732     .flush          = flush,
2733     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2734 };
2735 #endif
2736
2737 #if CONFIG_MPEG1_VDPAU_DECODER
2738 AVCodec ff_mpeg1_vdpau_decoder = {
2739     .name           = "mpeg1video_vdpau",
2740     .type           = AVMEDIA_TYPE_VIDEO,
2741     .id             = AV_CODEC_ID_MPEG1VIDEO,
2742     .priv_data_size = sizeof(Mpeg1Context),
2743     .init           = mpeg_decode_init,
2744     .close          = mpeg_decode_end,
2745     .decode         = mpeg_decode_frame,
2746     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2747                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2748     .flush          = flush,
2749     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2750 };
2751 #endif