Merge commit 'f1e9398621af0bc9d166014e4ce6996bb4f141d0'
[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.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.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
772             else
773                 mb_type = s->current_picture.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.mb_type[s->mb_x + s->mb_y*s->mb_stride] =
779                 mb_type | MB_TYPE_SKIP;
780
781 //            assert(s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1] & (MB_TYPE_16x16 | MB_TYPE_16x8));
782
783             if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
784                 s->mb_skipped = 1;
785         }
786
787         return 0;
788     }
789
790     switch (s->pict_type) {
791     default:
792     case AV_PICTURE_TYPE_I:
793         if (get_bits1(&s->gb) == 0) {
794             if (get_bits1(&s->gb) == 0) {
795                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
796                 return -1;
797             }
798             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
799         } else {
800             mb_type = MB_TYPE_INTRA;
801         }
802         break;
803     case AV_PICTURE_TYPE_P:
804         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
805         if (mb_type < 0) {
806             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
807             return -1;
808         }
809         mb_type = ptype2mb_type[mb_type];
810         break;
811     case AV_PICTURE_TYPE_B:
812         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
813         if (mb_type < 0) {
814             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
815             return -1;
816         }
817         mb_type = btype2mb_type[mb_type];
818         break;
819     }
820     av_dlog(s->avctx, "mb_type=%x\n", mb_type);
821 //    motion_type = 0; /* avoid warning */
822     if (IS_INTRA(mb_type)) {
823         s->dsp.clear_blocks(s->block[0]);
824
825         if (!s->chroma_y_shift) {
826             s->dsp.clear_blocks(s->block[6]);
827         }
828
829         /* compute DCT type */
830         if (s->picture_structure == PICT_FRAME && // FIXME add an interlaced_dct coded var?
831             !s->frame_pred_frame_dct) {
832             s->interlaced_dct = get_bits1(&s->gb);
833         }
834
835         if (IS_QUANT(mb_type))
836             s->qscale = get_qscale(s);
837
838         if (s->concealment_motion_vectors) {
839             /* just parse them */
840             if (s->picture_structure != PICT_FRAME)
841                 skip_bits1(&s->gb); /* field select */
842
843             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
844                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
845             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
846                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
847
848             skip_bits1(&s->gb); /* marker */
849         } else
850             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
851         s->mb_intra = 1;
852         // if 1, we memcpy blocks in xvmcvideo
853         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
854             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
855             if (s->swap_uv) {
856                 exchange_uv(s);
857             }
858         }
859
860         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
861             if (s->flags2 & CODEC_FLAG2_FAST) {
862                 for (i = 0; i < 6; i++) {
863                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
864                 }
865             } else {
866                 for (i = 0; i < mb_block_count; i++) {
867                     if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
868                         return -1;
869                 }
870             }
871         } else {
872             for (i = 0; i < 6; i++) {
873                 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
874                     return -1;
875             }
876         }
877     } else {
878         if (mb_type & MB_TYPE_ZERO_MV) {
879             av_assert2(mb_type & MB_TYPE_CBP);
880
881             s->mv_dir = MV_DIR_FORWARD;
882             if (s->picture_structure == PICT_FRAME) {
883                 if (s->picture_structure == PICT_FRAME
884                     && !s->frame_pred_frame_dct)
885                     s->interlaced_dct = get_bits1(&s->gb);
886                 s->mv_type = MV_TYPE_16X16;
887             } else {
888                 s->mv_type = MV_TYPE_FIELD;
889                 mb_type |= MB_TYPE_INTERLACED;
890                 s->field_select[0][0] = s->picture_structure - 1;
891             }
892
893             if (IS_QUANT(mb_type))
894                 s->qscale = get_qscale(s);
895
896             s->last_mv[0][0][0] = 0;
897             s->last_mv[0][0][1] = 0;
898             s->last_mv[0][1][0] = 0;
899             s->last_mv[0][1][1] = 0;
900             s->mv[0][0][0] = 0;
901             s->mv[0][0][1] = 0;
902         } else {
903             av_assert2(mb_type & MB_TYPE_L0L1);
904             // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
905             /* get additional motion vector type */
906             if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct)
907                 motion_type = MT_FRAME;
908             else {
909                 motion_type = get_bits(&s->gb, 2);
910                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
911                     s->interlaced_dct = get_bits1(&s->gb);
912             }
913
914             if (IS_QUANT(mb_type))
915                 s->qscale = get_qscale(s);
916
917             /* motion vectors */
918             s->mv_dir = (mb_type >> 13) & 3;
919             av_dlog(s->avctx, "motion_type=%d\n", motion_type);
920             switch (motion_type) {
921             case MT_FRAME: /* or MT_16X8 */
922                 if (s->picture_structure == PICT_FRAME) {
923                     mb_type |= MB_TYPE_16x16;
924                     s->mv_type = MV_TYPE_16X16;
925                     for (i = 0; i < 2; i++) {
926                         if (USES_LIST(mb_type, i)) {
927                             /* MT_FRAME */
928                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
929                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
930                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
931                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
932                             /* full_pel: only for MPEG-1 */
933                             if (s->full_pel[i]) {
934                                 s->mv[i][0][0] <<= 1;
935                                 s->mv[i][0][1] <<= 1;
936                             }
937                         }
938                     }
939                 } else {
940                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
941                     s->mv_type = MV_TYPE_16X8;
942                     for (i = 0; i < 2; i++) {
943                         if (USES_LIST(mb_type, i)) {
944                             /* MT_16X8 */
945                             for (j = 0; j < 2; j++) {
946                                 s->field_select[i][j] = get_bits1(&s->gb);
947                                 for (k = 0; k < 2; k++) {
948                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
949                                                              s->last_mv[i][j][k]);
950                                     s->last_mv[i][j][k] = val;
951                                     s->mv[i][j][k]      = val;
952                                 }
953                             }
954                         }
955                     }
956                 }
957                 break;
958             case MT_FIELD:
959                 s->mv_type = MV_TYPE_FIELD;
960                 if (s->picture_structure == PICT_FRAME) {
961                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
962                     for (i = 0; i < 2; i++) {
963                         if (USES_LIST(mb_type, i)) {
964                             for (j = 0; j < 2; j++) {
965                                 s->field_select[i][j] = get_bits1(&s->gb);
966                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
967                                                          s->last_mv[i][j][0]);
968                                 s->last_mv[i][j][0] = val;
969                                 s->mv[i][j][0]      = val;
970                                 av_dlog(s->avctx, "fmx=%d\n", val);
971                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
972                                                          s->last_mv[i][j][1] >> 1);
973                                 s->last_mv[i][j][1] = val << 1;
974                                 s->mv[i][j][1]      = val;
975                                 av_dlog(s->avctx, "fmy=%d\n", val);
976                             }
977                         }
978                     }
979                 } else {
980                     av_assert0(!s->progressive_sequence);
981                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
982                     for (i = 0; i < 2; i++) {
983                         if (USES_LIST(mb_type, i)) {
984                             s->field_select[i][0] = get_bits1(&s->gb);
985                             for (k = 0; k < 2; k++) {
986                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
987                                                          s->last_mv[i][0][k]);
988                                 s->last_mv[i][0][k] = val;
989                                 s->last_mv[i][1][k] = val;
990                                 s->mv[i][0][k]      = val;
991                             }
992                         }
993                     }
994                 }
995                 break;
996             case MT_DMV:
997                 if(s->progressive_sequence){
998                     av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
999                     return -1;
1000                 }
1001                 s->mv_type = MV_TYPE_DMV;
1002                 for (i = 0; i < 2; i++) {
1003                     if (USES_LIST(mb_type, i)) {
1004                         int dmx, dmy, mx, my, m;
1005                         const int my_shift = s->picture_structure == PICT_FRAME;
1006
1007                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1008                                                 s->last_mv[i][0][0]);
1009                         s->last_mv[i][0][0] = mx;
1010                         s->last_mv[i][1][0] = mx;
1011                         dmx = get_dmv(s);
1012                         my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1013                                                  s->last_mv[i][0][1] >> my_shift);
1014                         dmy = get_dmv(s);
1015
1016
1017                         s->last_mv[i][0][1] = my << my_shift;
1018                         s->last_mv[i][1][1] = my << my_shift;
1019
1020                         s->mv[i][0][0] = mx;
1021                         s->mv[i][0][1] = my;
1022                         s->mv[i][1][0] = mx; // not used
1023                         s->mv[i][1][1] = my; // not used
1024
1025                         if (s->picture_structure == PICT_FRAME) {
1026                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1027
1028                             // m = 1 + 2 * s->top_field_first;
1029                             m = s->top_field_first ? 1 : 3;
1030
1031                             /* top -> top pred */
1032                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1033                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1034                             m = 4 - m;
1035                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1036                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1037                         } else {
1038                             mb_type |= MB_TYPE_16x16;
1039
1040                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1041                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1042                             if (s->picture_structure == PICT_TOP_FIELD)
1043                                 s->mv[i][2][1]--;
1044                             else
1045                                 s->mv[i][2][1]++;
1046                         }
1047                     }
1048                 }
1049                 break;
1050             default:
1051                 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1052                 return -1;
1053             }
1054         }
1055
1056         s->mb_intra = 0;
1057         if (HAS_CBP(mb_type)) {
1058             s->dsp.clear_blocks(s->block[0]);
1059
1060             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1061             if (mb_block_count > 6) {
1062                  cbp <<= mb_block_count - 6;
1063                  cbp  |= get_bits(&s->gb, mb_block_count - 6);
1064                  s->dsp.clear_blocks(s->block[6]);
1065             }
1066             if (cbp <= 0) {
1067                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
1068                 return -1;
1069             }
1070
1071             //if 1, we memcpy blocks in xvmcvideo
1072             if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
1073                 ff_xvmc_pack_pblocks(s, cbp);
1074                 if (s->swap_uv) {
1075                     exchange_uv(s);
1076                 }
1077             }
1078
1079             if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1080                 if (s->flags2 & CODEC_FLAG2_FAST) {
1081                     for (i = 0; i < 6; i++) {
1082                         if (cbp & 32) {
1083                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1084                         } else {
1085                             s->block_last_index[i] = -1;
1086                         }
1087                         cbp += cbp;
1088                     }
1089                 } else {
1090                     cbp <<= 12-mb_block_count;
1091
1092                     for (i = 0; i < mb_block_count; i++) {
1093                         if (cbp & (1 << 11)) {
1094                             if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
1095                                 return -1;
1096                         } else {
1097                             s->block_last_index[i] = -1;
1098                         }
1099                         cbp += cbp;
1100                     }
1101                 }
1102             } else {
1103                 if (s->flags2 & CODEC_FLAG2_FAST) {
1104                     for (i = 0; i < 6; i++) {
1105                         if (cbp & 32) {
1106                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1107                         } else {
1108                             s->block_last_index[i] = -1;
1109                         }
1110                         cbp += cbp;
1111                     }
1112                 } else {
1113                     for (i = 0; i < 6; i++) {
1114                         if (cbp & 32) {
1115                             if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
1116                                 return -1;
1117                         } else {
1118                             s->block_last_index[i] = -1;
1119                         }
1120                         cbp += cbp;
1121                     }
1122                 }
1123             }
1124         } else {
1125             for (i = 0; i < 12; i++)
1126                 s->block_last_index[i] = -1;
1127         }
1128     }
1129
1130     s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1131
1132     return 0;
1133 }
1134
1135 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1136 {
1137     Mpeg1Context *s = avctx->priv_data;
1138     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1139     int i;
1140
1141     /* we need some permutation to store matrices,
1142      * until MPV_common_init() sets the real permutation. */
1143     for (i = 0; i < 64; i++)
1144        s2->dsp.idct_permutation[i]=i;
1145
1146     ff_MPV_decode_defaults(s2);
1147
1148     s->mpeg_enc_ctx.avctx  = avctx;
1149     s->mpeg_enc_ctx.flags  = avctx->flags;
1150     s->mpeg_enc_ctx.flags2 = avctx->flags2;
1151     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1152     ff_mpeg12_init_vlcs();
1153
1154     s->mpeg_enc_ctx_allocated      = 0;
1155     s->mpeg_enc_ctx.picture_number = 0;
1156     s->repeat_field                = 0;
1157     s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1158     avctx->color_range = AVCOL_RANGE_MPEG;
1159     if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1160         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1161     else
1162         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1163     return 0;
1164 }
1165
1166 static int mpeg_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
1167 {
1168     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1169     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1170     int err;
1171
1172     if (avctx == avctx_from || !ctx_from->mpeg_enc_ctx_allocated || !s1->context_initialized)
1173         return 0;
1174
1175     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1176     if (err) return err;
1177
1178     if (!ctx->mpeg_enc_ctx_allocated)
1179         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1180
1181     if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1182         s->picture_number++;
1183
1184     return 0;
1185 }
1186
1187 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1188                                  const uint8_t *new_perm)
1189 {
1190     uint16_t temp_matrix[64];
1191     int i;
1192
1193     memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1194
1195     for (i = 0; i < 64; i++) {
1196         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1197     }
1198 }
1199
1200 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1201 #if CONFIG_MPEG_XVMC_DECODER
1202     AV_PIX_FMT_XVMC_MPEG2_IDCT,
1203     AV_PIX_FMT_XVMC_MPEG2_MC,
1204 #endif
1205 #if CONFIG_MPEG1_VDPAU_HWACCEL
1206     AV_PIX_FMT_VDPAU_MPEG1,
1207 #endif
1208     AV_PIX_FMT_YUV420P,
1209     AV_PIX_FMT_NONE
1210 };
1211
1212 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1213 #if CONFIG_MPEG_XVMC_DECODER
1214     AV_PIX_FMT_XVMC_MPEG2_IDCT,
1215     AV_PIX_FMT_XVMC_MPEG2_MC,
1216 #endif
1217 #if CONFIG_MPEG2_VDPAU_HWACCEL
1218     AV_PIX_FMT_VDPAU_MPEG2,
1219 #endif
1220 #if CONFIG_MPEG2_DXVA2_HWACCEL
1221     AV_PIX_FMT_DXVA2_VLD,
1222 #endif
1223 #if CONFIG_MPEG2_VAAPI_HWACCEL
1224     AV_PIX_FMT_VAAPI_VLD,
1225 #endif
1226     AV_PIX_FMT_YUV420P,
1227     AV_PIX_FMT_NONE
1228 };
1229
1230 static inline int uses_vdpau(AVCodecContext *avctx) {
1231     return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1232 }
1233
1234 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1235 {
1236     Mpeg1Context *s1 = avctx->priv_data;
1237     MpegEncContext *s = &s1->mpeg_enc_ctx;
1238
1239     if(s->chroma_format < 2) {
1240         return 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     } else if(s->chroma_format == 2)
1245         return AV_PIX_FMT_YUV422P;
1246     else
1247         return AV_PIX_FMT_YUV444P;
1248 }
1249
1250 static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1251 {
1252     if (avctx->pix_fmt != AV_PIX_FMT_XVMC_MPEG2_IDCT && avctx->pix_fmt != AV_PIX_FMT_XVMC_MPEG2_MC) {
1253         avctx->xvmc_acceleration = 0;
1254     } else if (!avctx->xvmc_acceleration) {
1255         avctx->xvmc_acceleration = 2;
1256     }
1257     avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1258     // until then pix_fmt may be changed right after codec init
1259     if (avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT ||
1260         avctx->hwaccel || uses_vdpau(avctx))
1261         if (avctx->idct_algo == FF_IDCT_AUTO)
1262             avctx->idct_algo = FF_IDCT_SIMPLE;
1263 }
1264
1265 /* Call this function when we know all parameters.
1266  * It may be called in different places for MPEG-1 and MPEG-2. */
1267 static int mpeg_decode_postinit(AVCodecContext *avctx)
1268 {
1269     Mpeg1Context *s1 = avctx->priv_data;
1270     MpegEncContext *s = &s1->mpeg_enc_ctx;
1271     uint8_t old_permutation[64];
1272
1273     if ((s1->mpeg_enc_ctx_allocated == 0) ||
1274         avctx->coded_width  != s->width   ||
1275         avctx->coded_height != s->height  ||
1276         s1->save_width           != s->width                ||
1277         s1->save_height          != s->height               ||
1278         s1->save_aspect_info     != s->aspect_ratio_info    ||
1279         s1->save_progressive_seq != s->progressive_sequence ||
1280         0)
1281     {
1282
1283         if (s1->mpeg_enc_ctx_allocated) {
1284             ParseContext pc = s->parse_context;
1285             s->parse_context.buffer = 0;
1286             ff_MPV_common_end(s);
1287             s->parse_context = pc;
1288         }
1289
1290         if ((s->width == 0) || (s->height == 0))
1291             return -2;
1292
1293         avcodec_set_dimensions(avctx, s->width, s->height);
1294         if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1295             avctx->rc_max_rate = s->bit_rate;
1296         } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1297                    (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1298             avctx->bit_rate = s->bit_rate;
1299         }
1300         s1->save_aspect_info     = s->aspect_ratio_info;
1301         s1->save_width           = s->width;
1302         s1->save_height          = s->height;
1303         s1->save_progressive_seq = s->progressive_sequence;
1304
1305         /* low_delay may be forced, in this case we will have B-frames
1306          * that behave like P-frames. */
1307         avctx->has_b_frames = !s->low_delay;
1308
1309         if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1310             //MPEG-1 fps
1311             avctx->time_base.den = ff_mpeg12_frame_rate_tab[s->frame_rate_index].num;
1312             avctx->time_base.num = ff_mpeg12_frame_rate_tab[s->frame_rate_index].den;
1313             //MPEG-1 aspect
1314             avctx->sample_aspect_ratio = av_d2q(1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1315             avctx->ticks_per_frame=1;
1316         } else {//MPEG-2
1317         //MPEG-2 fps
1318             av_reduce(&s->avctx->time_base.den,
1319                       &s->avctx->time_base.num,
1320                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1321                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1322                       1 << 30);
1323             avctx->ticks_per_frame = 2;
1324             //MPEG-2 aspect
1325             if (s->aspect_ratio_info > 1) {
1326                 AVRational dar =
1327                     av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1328                                       (AVRational) {s1->pan_scan.width, s1->pan_scan.height}),
1329                              (AVRational) {s->width, s->height});
1330
1331                 // we ignore the spec here and guess a bit as reality does not match the spec, see for example
1332                 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1333                 // issue1613, 621, 562
1334                 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1335                    (av_cmp_q(dar, (AVRational) {4, 3}) && av_cmp_q(dar, (AVRational) {16, 9}))) {
1336                     s->avctx->sample_aspect_ratio =
1337                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1338                                  (AVRational) {s->width, s->height});
1339                 } else {
1340                     s->avctx->sample_aspect_ratio =
1341                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1342                                  (AVRational) {s1->pan_scan.width, s1->pan_scan.height});
1343 //issue1613 4/3 16/9 -> 16/9
1344 //res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1345 //widescreen-issue562.mpg 4/3 16/9 -> 16/9
1346 //                    s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1347                     av_dlog(avctx, "A %d/%d\n",
1348                             ff_mpeg2_aspect[s->aspect_ratio_info].num, ff_mpeg2_aspect[s->aspect_ratio_info].den);
1349                     av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1350                             s->avctx->sample_aspect_ratio.den);
1351                 }
1352             } else {
1353                 s->avctx->sample_aspect_ratio =
1354                     ff_mpeg2_aspect[s->aspect_ratio_info];
1355             }
1356         } // MPEG-2
1357
1358         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1359         setup_hwaccel_for_pixfmt(avctx);
1360
1361         /* Quantization matrices may need reordering
1362          * if DCT permutation is changed. */
1363         memcpy(old_permutation, s->dsp.idct_permutation, 64 * sizeof(uint8_t));
1364
1365         if (ff_MPV_common_init(s) < 0)
1366             return -2;
1367
1368         quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->dsp.idct_permutation);
1369         quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->dsp.idct_permutation);
1370         quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->dsp.idct_permutation);
1371         quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->dsp.idct_permutation);
1372
1373         s1->mpeg_enc_ctx_allocated = 1;
1374     }
1375     return 0;
1376 }
1377
1378 static int mpeg1_decode_picture(AVCodecContext *avctx,
1379                                 const uint8_t *buf, int buf_size)
1380 {
1381     Mpeg1Context *s1 = avctx->priv_data;
1382     MpegEncContext *s = &s1->mpeg_enc_ctx;
1383     int ref, f_code, vbv_delay;
1384
1385     init_get_bits(&s->gb, buf, buf_size*8);
1386
1387     ref = get_bits(&s->gb, 10); /* temporal ref */
1388     s->pict_type = get_bits(&s->gb, 3);
1389     if (s->pict_type == 0 || s->pict_type > 3)
1390         return -1;
1391
1392     vbv_delay = get_bits(&s->gb, 16);
1393     s->vbv_delay = vbv_delay;
1394     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
1395         s->full_pel[0] = get_bits1(&s->gb);
1396         f_code = get_bits(&s->gb, 3);
1397         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1398             return -1;
1399         f_code += !f_code;
1400         s->mpeg_f_code[0][0] = f_code;
1401         s->mpeg_f_code[0][1] = f_code;
1402     }
1403     if (s->pict_type == AV_PICTURE_TYPE_B) {
1404         s->full_pel[1] = get_bits1(&s->gb);
1405         f_code = get_bits(&s->gb, 3);
1406         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1407             return -1;
1408         f_code += !f_code;
1409         s->mpeg_f_code[1][0] = f_code;
1410         s->mpeg_f_code[1][1] = f_code;
1411     }
1412     s->current_picture.f.pict_type = s->pict_type;
1413     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1414
1415     if (avctx->debug & FF_DEBUG_PICT_INFO)
1416         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1417
1418     s->y_dc_scale = 8;
1419     s->c_dc_scale = 8;
1420     return 0;
1421 }
1422
1423 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1424 {
1425     MpegEncContext *s= &s1->mpeg_enc_ctx;
1426     int horiz_size_ext, vert_size_ext;
1427     int bit_rate_ext;
1428
1429     skip_bits(&s->gb, 1); /* profile and level esc*/
1430     s->avctx->profile       = get_bits(&s->gb, 3);
1431     s->avctx->level         = get_bits(&s->gb, 4);
1432     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1433     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1434     horiz_size_ext          = get_bits(&s->gb, 2);
1435     vert_size_ext           = get_bits(&s->gb, 2);
1436     s->width  |= (horiz_size_ext << 12);
1437     s->height |= (vert_size_ext  << 12);
1438     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1439     s->bit_rate += (bit_rate_ext << 18) * 400;
1440     skip_bits1(&s->gb); /* marker */
1441     s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1442
1443     s->low_delay = get_bits1(&s->gb);
1444     if (s->flags & CODEC_FLAG_LOW_DELAY)
1445         s->low_delay = 1;
1446
1447     s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1448     s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1449
1450     av_dlog(s->avctx, "sequence extension\n");
1451     s->codec_id      = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1452
1453     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1454         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1455                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1456
1457 }
1458
1459 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1460 {
1461     MpegEncContext *s = &s1->mpeg_enc_ctx;
1462     int color_description, w, h;
1463
1464     skip_bits(&s->gb, 3); /* video format */
1465     color_description = get_bits1(&s->gb);
1466     if (color_description) {
1467         s->avctx->color_primaries = get_bits(&s->gb, 8);
1468         s->avctx->color_trc       = get_bits(&s->gb, 8);
1469         s->avctx->colorspace      = get_bits(&s->gb, 8);
1470     }
1471     w = get_bits(&s->gb, 14);
1472     skip_bits(&s->gb, 1); //marker
1473     h = get_bits(&s->gb, 14);
1474     // remaining 3 bits are zero padding
1475
1476     s1->pan_scan.width  = 16 * w;
1477     s1->pan_scan.height = 16 * h;
1478
1479     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1480         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1481 }
1482
1483 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1484 {
1485     MpegEncContext *s = &s1->mpeg_enc_ctx;
1486     int i, nofco;
1487
1488     nofco = 1;
1489     if (s->progressive_sequence) {
1490         if (s->repeat_first_field) {
1491             nofco++;
1492             if (s->top_field_first)
1493                 nofco++;
1494         }
1495     } else {
1496         if (s->picture_structure == PICT_FRAME) {
1497             nofco++;
1498             if (s->repeat_first_field)
1499                 nofco++;
1500         }
1501     }
1502     for (i = 0; i < nofco; i++) {
1503         s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1504         skip_bits(&s->gb, 1); // marker
1505         s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1506         skip_bits(&s->gb, 1); // marker
1507     }
1508
1509     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1510         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1511                s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1512                s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1513                s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1514 }
1515
1516 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra)
1517 {
1518     int i;
1519
1520     for (i = 0; i < 64; i++) {
1521         int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1522         int v = get_bits(&s->gb, 8);
1523         if (v == 0) {
1524             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1525             return -1;
1526         }
1527         if (intra && i == 0 && v != 8) {
1528             av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1529             v = 8; // needed by pink.mpg / issue1046
1530         }
1531         matrix0[j] = v;
1532         if (matrix1)
1533             matrix1[j] = v;
1534     }
1535     return 0;
1536 }
1537
1538 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1539 {
1540     av_dlog(s->avctx, "matrix extension\n");
1541
1542     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1543     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1544     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL           , 1);
1545     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL           , 0);
1546 }
1547
1548 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1549 {
1550     MpegEncContext *s = &s1->mpeg_enc_ctx;
1551
1552     s->full_pel[0] = s->full_pel[1] = 0;
1553     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1554     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1555     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1556     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1557     if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1558         av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1559         if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1560             if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1561                 s->pict_type = AV_PICTURE_TYPE_I;
1562             else
1563                 s->pict_type = AV_PICTURE_TYPE_P;
1564         } else
1565             s->pict_type = AV_PICTURE_TYPE_B;
1566         s->current_picture.f.pict_type = s->pict_type;
1567         s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1568     }
1569     s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1570     s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1571     s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1572     s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1573
1574     s->intra_dc_precision         = get_bits(&s->gb, 2);
1575     s->picture_structure          = get_bits(&s->gb, 2);
1576     s->top_field_first            = get_bits1(&s->gb);
1577     s->frame_pred_frame_dct       = get_bits1(&s->gb);
1578     s->concealment_motion_vectors = get_bits1(&s->gb);
1579     s->q_scale_type               = get_bits1(&s->gb);
1580     s->intra_vlc_format           = get_bits1(&s->gb);
1581     s->alternate_scan             = get_bits1(&s->gb);
1582     s->repeat_first_field         = get_bits1(&s->gb);
1583     s->chroma_420_type            = get_bits1(&s->gb);
1584     s->progressive_frame          = get_bits1(&s->gb);
1585
1586
1587     if (s->alternate_scan) {
1588         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1589         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1590     } else {
1591         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1592         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1593     }
1594
1595     /* composite display not parsed */
1596     av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1597     av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1598     av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1599     av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1600     av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1601     av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1602     av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1603     av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1604     av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1605 }
1606
1607 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1608 {
1609     AVCodecContext *avctx = s->avctx;
1610     Mpeg1Context *s1 = (Mpeg1Context*)s;
1611
1612     /* start frame decoding */
1613     if (s->first_field || s->picture_structure == PICT_FRAME) {
1614         AVFrameSideData *pan_scan;
1615
1616         if (ff_MPV_frame_start(s, avctx) < 0)
1617             return -1;
1618
1619         ff_mpeg_er_frame_start(s);
1620
1621         /* first check if we must repeat the frame */
1622         s->current_picture_ptr->f.repeat_pict = 0;
1623         if (s->repeat_first_field) {
1624             if (s->progressive_sequence) {
1625                 if (s->top_field_first)
1626                     s->current_picture_ptr->f.repeat_pict = 4;
1627                 else
1628                     s->current_picture_ptr->f.repeat_pict = 2;
1629             } else if (s->progressive_frame) {
1630                 s->current_picture_ptr->f.repeat_pict = 1;
1631             }
1632         }
1633
1634         pan_scan = av_frame_new_side_data(&s->current_picture_ptr->f,
1635                                           AV_FRAME_DATA_PANSCAN,
1636                                           sizeof(s1->pan_scan));
1637         if (!pan_scan)
1638             return AVERROR(ENOMEM);
1639         memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1640
1641         if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1642             ff_thread_finish_setup(avctx);
1643     } else { // second field
1644         int i;
1645
1646         if (!s->current_picture_ptr) {
1647             av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1648             return -1;
1649         }
1650
1651         if (s->avctx->hwaccel &&
1652             (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1653             if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1654                 av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode first field\n");
1655         }
1656
1657         for (i = 0; i < 4; i++) {
1658             s->current_picture.f.data[i] = s->current_picture_ptr->f.data[i];
1659             if (s->picture_structure == PICT_BOTTOM_FIELD) {
1660                 s->current_picture.f.data[i] += s->current_picture_ptr->f.linesize[i];
1661             }
1662         }
1663     }
1664
1665     if (avctx->hwaccel) {
1666         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1667             return -1;
1668     }
1669
1670 // MPV_frame_start will call this function too,
1671 // but we need to call it on every field
1672     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1673         if (ff_xvmc_field_start(s, avctx) < 0)
1674             return -1;
1675
1676     return 0;
1677 }
1678
1679 #define DECODE_SLICE_ERROR -1
1680 #define DECODE_SLICE_OK     0
1681
1682 /**
1683  * Decode a slice.
1684  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1685  * @return DECODE_SLICE_ERROR if the slice is damaged,
1686  *         DECODE_SLICE_OK if this slice is OK
1687  */
1688 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1689                              const uint8_t **buf, int buf_size)
1690 {
1691     AVCodecContext *avctx = s->avctx;
1692     const int lowres      = s->avctx->lowres;
1693     const int field_pic   = s->picture_structure != PICT_FRAME;
1694
1695     s->resync_mb_x =
1696     s->resync_mb_y = -1;
1697
1698     av_assert0(mb_y < s->mb_height);
1699
1700     init_get_bits(&s->gb, *buf, buf_size * 8);
1701     if(s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1702         skip_bits(&s->gb, 3);
1703
1704     ff_mpeg1_clean_buffers(s);
1705     s->interlaced_dct = 0;
1706
1707     s->qscale = get_qscale(s);
1708
1709     if (s->qscale == 0) {
1710         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1711         return -1;
1712     }
1713
1714     /* extra slice info */
1715     while (get_bits1(&s->gb) != 0) {
1716         skip_bits(&s->gb, 8);
1717     }
1718
1719     s->mb_x = 0;
1720
1721     if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1722         skip_bits1(&s->gb);
1723     } else {
1724         while (get_bits_left(&s->gb) > 0) {
1725             int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1726             if (code < 0) {
1727                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1728                 return -1;
1729             }
1730             if (code >= 33) {
1731                 if (code == 33) {
1732                     s->mb_x += 33;
1733                 }
1734                 /* otherwise, stuffing, nothing to do */
1735             } else {
1736                 s->mb_x += code;
1737                 break;
1738             }
1739         }
1740     }
1741
1742     if (s->mb_x >= (unsigned)s->mb_width) {
1743         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1744         return -1;
1745     }
1746
1747     if (avctx->hwaccel) {
1748         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1749         int start_code = -1;
1750         buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1751         if (buf_end < *buf + buf_size)
1752             buf_end -= 4;
1753         s->mb_y = mb_y;
1754         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1755             return DECODE_SLICE_ERROR;
1756         *buf = buf_end;
1757         return DECODE_SLICE_OK;
1758     }
1759
1760     s->resync_mb_x = s->mb_x;
1761     s->resync_mb_y = s->mb_y = mb_y;
1762     s->mb_skip_run = 0;
1763     ff_init_block_index(s);
1764
1765     if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1766         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1767              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",
1768                     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],
1769                     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")),
1770                     s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1771                     s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1772                     s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1773         }
1774     }
1775
1776     for (;;) {
1777         // If 1, we memcpy blocks in xvmcvideo.
1778         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1779             ff_xvmc_init_block(s); // set s->block
1780
1781         if (mpeg_decode_mb(s, s->block) < 0)
1782             return -1;
1783
1784         if (s->current_picture.motion_val[0] && !s->encoding) { // note motion_val is normally NULL unless we want to extract the MVs
1785             const int wrap = s->b8_stride;
1786             int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1787             int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1788             int motion_x, motion_y, dir, i;
1789
1790             for (i = 0; i < 2; i++) {
1791                 for (dir = 0; dir < 2; dir++) {
1792                     if (s->mb_intra || (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1793                         motion_x = motion_y = 0;
1794                     } else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1795                         motion_x = s->mv[dir][0][0];
1796                         motion_y = s->mv[dir][0][1];
1797                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1798                         motion_x = s->mv[dir][i][0];
1799                         motion_y = s->mv[dir][i][1];
1800                     }
1801
1802                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1803                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1804                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1805                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1806                     s->current_picture.ref_index [dir][b8_xy    ] =
1807                     s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1808                     av_assert2(s->field_select[dir][i] == 0 || s->field_select[dir][i] == 1);
1809                 }
1810                 xy += wrap;
1811                 b8_xy +=2;
1812             }
1813         }
1814
1815         s->dest[0] += 16 >> lowres;
1816         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1817         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1818
1819         ff_MPV_decode_mb(s, s->block);
1820
1821         if (++s->mb_x >= s->mb_width) {
1822             const int mb_size = 16 >> s->avctx->lowres;
1823
1824             ff_mpeg_draw_horiz_band(s, mb_size*(s->mb_y >> field_pic), mb_size);
1825             ff_MPV_report_decode_progress(s);
1826
1827             s->mb_x = 0;
1828             s->mb_y += 1 << field_pic;
1829
1830             if (s->mb_y >= s->mb_height) {
1831                 int left   = get_bits_left(&s->gb);
1832                 int is_d10 = s->chroma_format == 2 && s->pict_type == AV_PICTURE_TYPE_I && avctx->profile == 0 && avctx->level == 5
1833                              && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1834                              && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1835
1836                 if (left >= 32 && !is_d10) {
1837                     GetBitContext gb = s->gb;
1838                     align_get_bits(&gb);
1839                     if (show_bits(&gb, 24) == 0x060E2B) {
1840                         av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1841                         is_d10 = 1;
1842                     }
1843                 }
1844
1845                 if (left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1846                     || ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1847                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1848                     return -1;
1849                 } else
1850                     goto eos;
1851             }
1852
1853             ff_init_block_index(s);
1854         }
1855
1856         /* skip mb handling */
1857         if (s->mb_skip_run == -1) {
1858             /* read increment again */
1859             s->mb_skip_run = 0;
1860             for (;;) {
1861                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1862                 if (code < 0) {
1863                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1864                     return -1;
1865                 }
1866                 if (code >= 33) {
1867                     if (code == 33) {
1868                         s->mb_skip_run += 33;
1869                     } else if (code == 35) {
1870                         if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1871                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1872                             return -1;
1873                         }
1874                         goto eos; /* end of slice */
1875                     }
1876                     /* otherwise, stuffing, nothing to do */
1877                 } else {
1878                     s->mb_skip_run += code;
1879                     break;
1880                 }
1881             }
1882             if (s->mb_skip_run) {
1883                 int i;
1884                 if (s->pict_type == AV_PICTURE_TYPE_I) {
1885                     av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1886                     return -1;
1887                 }
1888
1889                 /* skip mb */
1890                 s->mb_intra = 0;
1891                 for (i = 0; i < 12; i++)
1892                     s->block_last_index[i] = -1;
1893                 if (s->picture_structure == PICT_FRAME)
1894                     s->mv_type = MV_TYPE_16X16;
1895                 else
1896                     s->mv_type = MV_TYPE_FIELD;
1897                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1898                     /* if P type, zero motion vector is implied */
1899                     s->mv_dir             = MV_DIR_FORWARD;
1900                     s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1901                     s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1902                     s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1903                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1904                 } else {
1905                     /* if B type, reuse previous vectors and directions */
1906                     s->mv[0][0][0] = s->last_mv[0][0][0];
1907                     s->mv[0][0][1] = s->last_mv[0][0][1];
1908                     s->mv[1][0][0] = s->last_mv[1][0][0];
1909                     s->mv[1][0][1] = s->last_mv[1][0][1];
1910                 }
1911             }
1912         }
1913     }
1914 eos: // end of slice
1915     *buf += (get_bits_count(&s->gb)-1)/8;
1916     av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1917     return 0;
1918 }
1919
1920 static int slice_decode_thread(AVCodecContext *c, void *arg)
1921 {
1922     MpegEncContext *s   = *(void**)arg;
1923     const uint8_t *buf  = s->gb.buffer;
1924     int mb_y            = s->start_mb_y;
1925     const int field_pic = s->picture_structure != PICT_FRAME;
1926
1927     s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1928
1929     for (;;) {
1930         uint32_t start_code;
1931         int ret;
1932
1933         ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1934         emms_c();
1935         av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1936                 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1937                 s->start_mb_y, s->end_mb_y, s->er.error_count);
1938         if (ret < 0) {
1939             if (c->err_recognition & AV_EF_EXPLODE)
1940                 return ret;
1941             if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1942                 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);
1943         } else {
1944             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);
1945         }
1946
1947         if (s->mb_y == s->end_mb_y)
1948             return 0;
1949
1950         start_code = -1;
1951         buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
1952         mb_y= start_code - SLICE_MIN_START_CODE;
1953         if(s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1954             mb_y += (*buf&0xE0)<<2;
1955         mb_y <<= field_pic;
1956         if (s->picture_structure == PICT_BOTTOM_FIELD)
1957             mb_y++;
1958         if (mb_y < 0 || mb_y >= s->end_mb_y)
1959             return -1;
1960     }
1961 }
1962
1963 /**
1964  * Handle slice ends.
1965  * @return 1 if it seems to be the last slice
1966  */
1967 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1968 {
1969     Mpeg1Context *s1 = avctx->priv_data;
1970     MpegEncContext *s = &s1->mpeg_enc_ctx;
1971
1972     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1973         return 0;
1974
1975     if (s->avctx->hwaccel) {
1976         if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1977             av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1978     }
1979
1980     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1981         ff_xvmc_field_end(s);
1982
1983     /* end of slice reached */
1984     if (/*s->mb_y << field_pic == s->mb_height &&*/ !s->first_field && !s->first_slice) {
1985         /* end of image */
1986
1987         ff_er_frame_end(&s->er);
1988
1989         ff_MPV_frame_end(s);
1990
1991         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
1992             int ret = av_frame_ref(pict, &s->current_picture_ptr->f);
1993             if (ret < 0)
1994                 return ret;
1995             ff_print_debug_info(s, s->current_picture_ptr, pict);
1996             ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
1997         } else {
1998             if (avctx->active_thread_type & FF_THREAD_FRAME)
1999                 s->picture_number++;
2000             /* latency of 1 frame for I- and P-frames */
2001             /* XXX: use another variable than picture_number */
2002             if (s->last_picture_ptr != NULL) {
2003                 int ret = av_frame_ref(pict, &s->last_picture_ptr->f);
2004                 if (ret < 0)
2005                     return ret;
2006                 ff_print_debug_info(s, s->last_picture_ptr, pict);
2007                 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2008             }
2009         }
2010
2011         return 1;
2012     } else {
2013         return 0;
2014     }
2015 }
2016
2017 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2018                                  const uint8_t *buf, int buf_size)
2019 {
2020     Mpeg1Context *s1 = avctx->priv_data;
2021     MpegEncContext *s = &s1->mpeg_enc_ctx;
2022     int width, height;
2023     int i, v, j;
2024
2025     init_get_bits(&s->gb, buf, buf_size*8);
2026
2027     width  = get_bits(&s->gb, 12);
2028     height = get_bits(&s->gb, 12);
2029     if (width == 0 || height == 0) {
2030         av_log(avctx, AV_LOG_WARNING, "Invalid horizontal or vertical size "
2031                "value.\n");
2032         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2033             return AVERROR_INVALIDDATA;
2034     }
2035     s->aspect_ratio_info = get_bits(&s->gb, 4);
2036     if (s->aspect_ratio_info == 0) {
2037         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2038         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2039             return -1;
2040     }
2041     s->frame_rate_index = get_bits(&s->gb, 4);
2042     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2043         return -1;
2044     s->bit_rate = get_bits(&s->gb, 18) * 400;
2045     if (get_bits1(&s->gb) == 0) /* marker */
2046         return -1;
2047     s->width  = width;
2048     s->height = height;
2049
2050     s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2051     skip_bits(&s->gb, 1);
2052
2053     /* get matrix */
2054     if (get_bits1(&s->gb)) {
2055         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2056     } else {
2057         for (i = 0; i < 64; i++) {
2058             j = s->dsp.idct_permutation[i];
2059             v = ff_mpeg1_default_intra_matrix[i];
2060             s->intra_matrix[j]        = v;
2061             s->chroma_intra_matrix[j] = v;
2062         }
2063     }
2064     if (get_bits1(&s->gb)) {
2065         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2066     } else {
2067         for (i = 0; i < 64; i++) {
2068             int j = s->dsp.idct_permutation[i];
2069             v = ff_mpeg1_default_non_intra_matrix[i];
2070             s->inter_matrix[j]        = v;
2071             s->chroma_inter_matrix[j] = v;
2072         }
2073     }
2074
2075     if (show_bits(&s->gb, 23) != 0) {
2076         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2077         return -1;
2078     }
2079
2080     /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2081     s->progressive_sequence = 1;
2082     s->progressive_frame    = 1;
2083     s->picture_structure    = PICT_FRAME;
2084     s->first_field          = 0;
2085     s->frame_pred_frame_dct = 1;
2086     s->chroma_format        = 1;
2087     s->codec_id             = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2088     s->out_format           = FMT_MPEG1;
2089     s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2090     if (s->flags & CODEC_FLAG_LOW_DELAY)
2091         s->low_delay = 1;
2092
2093     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2094         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2095                s->avctx->rc_buffer_size, s->bit_rate);
2096
2097     return 0;
2098 }
2099
2100 static int vcr2_init_sequence(AVCodecContext *avctx)
2101 {
2102     Mpeg1Context *s1 = avctx->priv_data;
2103     MpegEncContext *s = &s1->mpeg_enc_ctx;
2104     int i, v;
2105
2106     /* start new MPEG-1 context decoding */
2107     s->out_format = FMT_MPEG1;
2108     if (s1->mpeg_enc_ctx_allocated) {
2109         ff_MPV_common_end(s);
2110     }
2111     s->width  = avctx->coded_width;
2112     s->height = avctx->coded_height;
2113     avctx->has_b_frames = 0; // true?
2114     s->low_delay = 1;
2115
2116     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2117     setup_hwaccel_for_pixfmt(avctx);
2118
2119     if (ff_MPV_common_init(s) < 0)
2120         return -1;
2121     s1->mpeg_enc_ctx_allocated = 1;
2122
2123     for (i = 0; i < 64; i++) {
2124         int j = s->dsp.idct_permutation[i];
2125         v = ff_mpeg1_default_intra_matrix[i];
2126         s->intra_matrix[j]        = v;
2127         s->chroma_intra_matrix[j] = v;
2128
2129         v = ff_mpeg1_default_non_intra_matrix[i];
2130         s->inter_matrix[j]        = v;
2131         s->chroma_inter_matrix[j] = v;
2132     }
2133
2134     s->progressive_sequence  = 1;
2135     s->progressive_frame     = 1;
2136     s->picture_structure     = PICT_FRAME;
2137     s->first_field           = 0;
2138     s->frame_pred_frame_dct  = 1;
2139     s->chroma_format         = 1;
2140     if (s->codec_tag == AV_RL32("BW10")) {
2141         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2142     } else {
2143         exchange_uv(s); // common init reset pblocks, so we swap them here
2144         s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2145         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2146     }
2147     s1->save_width           = s->width;
2148     s1->save_height          = s->height;
2149     s1->save_progressive_seq = s->progressive_sequence;
2150     return 0;
2151 }
2152
2153
2154 static void mpeg_decode_user_data(AVCodecContext *avctx,
2155                                   const uint8_t *p, int buf_size)
2156 {
2157     Mpeg1Context *s = avctx->priv_data;
2158     const uint8_t *buf_end = p + buf_size;
2159
2160     if(buf_size > 29){
2161         int i;
2162         for(i=0; i<20; i++)
2163             if(!memcmp(p+i, "\0TMPGEXS\0", 9)){
2164                 s->tmpgexs= 1;
2165             }
2166
2167 /*        for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2168             av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2169         }
2170             av_log(avctx, AV_LOG_ERROR, "\n");*/
2171     }
2172
2173     /* we parse the DTG active format information */
2174     if (buf_end - p >= 5 &&
2175         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2176         int flags = p[4];
2177         p += 5;
2178         if (flags & 0x80) {
2179             /* skip event id */
2180             p += 2;
2181         }
2182         if (flags & 0x40) {
2183             if (buf_end - p < 1)
2184                 return;
2185             avctx->dtg_active_format = p[0] & 0x0f;
2186         }
2187     }
2188 }
2189
2190 static void mpeg_decode_gop(AVCodecContext *avctx,
2191                             const uint8_t *buf, int buf_size)
2192 {
2193     Mpeg1Context *s1  = avctx->priv_data;
2194     MpegEncContext *s = &s1->mpeg_enc_ctx;
2195     int broken_link;
2196     int64_t tc;
2197
2198     init_get_bits(&s->gb, buf, buf_size*8);
2199
2200     tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2201
2202     s->closed_gop = get_bits1(&s->gb);
2203     /*broken_link indicate that after editing the
2204       reference frames of the first B-Frames after GOP I-Frame
2205       are missing (open gop)*/
2206     broken_link = get_bits1(&s->gb);
2207
2208     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2209         char tcbuf[AV_TIMECODE_STR_SIZE];
2210         av_timecode_make_mpeg_tc_string(tcbuf, tc);
2211         av_log(s->avctx, AV_LOG_DEBUG,
2212                "GOP (%s) closed_gop=%d broken_link=%d\n",
2213                tcbuf, s->closed_gop, broken_link);
2214     }
2215 }
2216 /**
2217  * Find the end of the current frame in the bitstream.
2218  * @return the position of the first byte of the next frame, or -1
2219  */
2220 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2221 {
2222     int i;
2223     uint32_t state = pc->state;
2224
2225     /* EOF considered as end of frame */
2226     if (buf_size == 0)
2227         return 0;
2228
2229 /*
2230  0  frame start         -> 1/4
2231  1  first_SEQEXT        -> 0/2
2232  2  first field start   -> 3/0
2233  3  second_SEQEXT       -> 2/0
2234  4  searching end
2235 */
2236
2237     for (i = 0; i < buf_size; i++) {
2238         av_assert1(pc->frame_start_found >= 0 && pc->frame_start_found <= 4);
2239         if (pc->frame_start_found & 1) {
2240             if (state == EXT_START_CODE && (buf[i] & 0xF0) != 0x80)
2241                 pc->frame_start_found--;
2242             else if (state == EXT_START_CODE + 2) {
2243                 if ((buf[i] & 3) == 3)
2244                     pc->frame_start_found = 0;
2245                 else
2246                     pc->frame_start_found = (pc->frame_start_found + 1) & 3;
2247             }
2248             state++;
2249         } else {
2250             i = avpriv_find_start_code(buf + i, buf + buf_size, &state) - buf - 1;
2251             if (pc->frame_start_found == 0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE) {
2252                 i++;
2253                 pc->frame_start_found = 4;
2254             }
2255             if (state == SEQ_END_CODE) {
2256                 pc->frame_start_found = 0;
2257                 pc->state=-1;
2258                 return i+1;
2259             }
2260             if (pc->frame_start_found == 2 && state == SEQ_START_CODE)
2261                 pc->frame_start_found = 0;
2262             if (pc->frame_start_found  < 4 && state == EXT_START_CODE)
2263                 pc->frame_start_found++;
2264             if (pc->frame_start_found == 4 && (state & 0xFFFFFF00) == 0x100) {
2265                 if (state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE) {
2266                     pc->frame_start_found = 0;
2267                     pc->state             = -1;
2268                     return i - 3;
2269                 }
2270             }
2271             if (pc->frame_start_found == 0 && s && state == PICTURE_START_CODE) {
2272                 ff_fetch_timestamp(s, i - 3, 1);
2273             }
2274         }
2275     }
2276     pc->state = state;
2277     return END_NOT_FOUND;
2278 }
2279
2280 static int decode_chunks(AVCodecContext *avctx,
2281                          AVFrame *picture, int *got_output,
2282                          const uint8_t *buf, int buf_size)
2283 {
2284     Mpeg1Context *s = avctx->priv_data;
2285     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2286     const uint8_t *buf_ptr = buf;
2287     const uint8_t *buf_end = buf + buf_size;
2288     int ret, input_size;
2289     int last_code = 0;
2290     int picture_start_code_seen = 0;
2291
2292     for (;;) {
2293         /* find next start code */
2294         uint32_t start_code = -1;
2295         buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2296         if (start_code > 0x1ff) {
2297             if (s2->pict_type != AV_PICTURE_TYPE_B || avctx->skip_frame <= AVDISCARD_DEFAULT) {
2298                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2299                     int i;
2300                     av_assert0(avctx->thread_count > 1);
2301
2302                     avctx->execute(avctx, slice_decode_thread,  &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
2303                     for (i = 0; i < s->slice_count; i++)
2304                         s2->er.error_count += s2->thread_context[i]->er.error_count;
2305                 }
2306
2307                 if (CONFIG_VDPAU && uses_vdpau(avctx))
2308                     ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2309
2310                 ret = slice_end(avctx, picture);
2311                 if (ret < 0)
2312                     return ret;
2313                 else if (ret) {
2314                     if (s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2315                         *got_output = 1;
2316                 }
2317             }
2318             s2->pict_type = 0;
2319             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2320         }
2321
2322         input_size = buf_end - buf_ptr;
2323
2324         if (avctx->debug & FF_DEBUG_STARTCODE) {
2325             av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2326         }
2327
2328         /* prepare data for next start code */
2329         switch (start_code) {
2330         case SEQ_START_CODE:
2331             if (last_code == 0) {
2332                 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2333                 if(buf != avctx->extradata)
2334                     s->sync=1;
2335             } else {
2336                 av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2337                 if (avctx->err_recognition & AV_EF_EXPLODE)
2338                     return AVERROR_INVALIDDATA;
2339             }
2340             break;
2341
2342         case PICTURE_START_CODE:
2343             if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2344                /* If it's a frame picture, there can't be more than one picture header.
2345                   Yet, it does happen and we need to handle it. */
2346                av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2347                break;
2348             }
2349             picture_start_code_seen = 1;
2350
2351             if (s2->width <= 0 || s2->height <= 0) {
2352                 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2353                        s2->width, s2->height);
2354                 return AVERROR_INVALIDDATA;
2355             }
2356
2357             if(s->tmpgexs){
2358                 s2->intra_dc_precision= 3;
2359                 s2->intra_matrix[0]= 1;
2360             }
2361             if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) && s->slice_count) {
2362                 int i;
2363
2364                 avctx->execute(avctx, slice_decode_thread,
2365                                s2->thread_context, NULL,
2366                                s->slice_count, sizeof(void*));
2367                 for (i = 0; i < s->slice_count; i++)
2368                     s2->er.error_count += s2->thread_context[i]->er.error_count;
2369                 s->slice_count = 0;
2370             }
2371             if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2372                 ret = mpeg_decode_postinit(avctx);
2373                 if (ret < 0) {
2374                     av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
2375                     return ret;
2376                 }
2377
2378                 /* we have a complete image: we try to decompress it */
2379                 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2380                     s2->pict_type = 0;
2381                 s2->first_slice = 1;
2382                 last_code = PICTURE_START_CODE;
2383             } else {
2384                 av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
2385                 if (avctx->err_recognition & AV_EF_EXPLODE)
2386                     return AVERROR_INVALIDDATA;
2387             }
2388             break;
2389         case EXT_START_CODE:
2390             init_get_bits(&s2->gb, buf_ptr, input_size*8);
2391
2392             switch (get_bits(&s2->gb, 4)) {
2393             case 0x1:
2394                 if (last_code == 0) {
2395                 mpeg_decode_sequence_extension(s);
2396                 } else {
2397                     av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
2398                     if (avctx->err_recognition & AV_EF_EXPLODE)
2399                         return AVERROR_INVALIDDATA;
2400                 }
2401                 break;
2402             case 0x2:
2403                 mpeg_decode_sequence_display_extension(s);
2404                 break;
2405             case 0x3:
2406                 mpeg_decode_quant_matrix_extension(s2);
2407                 break;
2408             case 0x7:
2409                 mpeg_decode_picture_display_extension(s);
2410                 break;
2411             case 0x8:
2412                 if (last_code == PICTURE_START_CODE) {
2413                     mpeg_decode_picture_coding_extension(s);
2414                 } else {
2415                     av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
2416                     if (avctx->err_recognition & AV_EF_EXPLODE)
2417                         return AVERROR_INVALIDDATA;
2418                 }
2419                 break;
2420             }
2421             break;
2422         case USER_START_CODE:
2423             mpeg_decode_user_data(avctx, buf_ptr, input_size);
2424             break;
2425         case GOP_START_CODE:
2426             if (last_code == 0) {
2427                 s2->first_field=0;
2428                 mpeg_decode_gop(avctx, buf_ptr, input_size);
2429                 s->sync=1;
2430             } else {
2431                 av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
2432                 if (avctx->err_recognition & AV_EF_EXPLODE)
2433                     return AVERROR_INVALIDDATA;
2434             }
2435             break;
2436         default:
2437             if (start_code >= SLICE_MIN_START_CODE &&
2438                 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2439
2440                 if (s2->progressive_sequence && !s2->progressive_frame) {
2441                     s2->progressive_frame = 1;
2442                     av_log(s2->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
2443                 }
2444
2445                 if (s2->picture_structure == 0 || (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2446                     av_log(s2->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s2->picture_structure);
2447                     s2->picture_structure = PICT_FRAME;
2448                 }
2449
2450                 if (s2->progressive_sequence && !s2->frame_pred_frame_dct) {
2451                     av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2452                 }
2453
2454                 if (s2->picture_structure == PICT_FRAME) {
2455                     s2->first_field = 0;
2456                     s2->v_edge_pos  = 16 * s2->mb_height;
2457                 } else {
2458                     s2->first_field ^= 1;
2459                     s2->v_edge_pos   = 8 * s2->mb_height;
2460                     memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2461                 }
2462             }
2463             if (start_code >= SLICE_MIN_START_CODE &&
2464                 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2465                 const int field_pic = s2->picture_structure != PICT_FRAME;
2466                 int mb_y = start_code - SLICE_MIN_START_CODE;
2467                 last_code = SLICE_MIN_START_CODE;
2468                 if(s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2469                     mb_y += (*buf_ptr&0xE0)<<2;
2470
2471                 mb_y <<= field_pic;
2472                 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2473                     mb_y++;
2474
2475                 if (mb_y >= s2->mb_height) {
2476                     av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2477                     return -1;
2478                 }
2479
2480                 if (s2->last_picture_ptr == NULL) {
2481                 /* Skip B-frames if we do not have reference frames and gop is not closed */
2482                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
2483                         if (!s2->closed_gop)
2484                             break;
2485                     }
2486                 }
2487                 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
2488                     s->sync=1;
2489                 if (s2->next_picture_ptr == NULL) {
2490                 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2491                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) break;
2492                 }
2493                 if ((avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type == AV_PICTURE_TYPE_B) ||
2494                     (avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type != AV_PICTURE_TYPE_I) ||
2495                      avctx->skip_frame >= AVDISCARD_ALL)
2496                     break;
2497
2498                 if (!s->mpeg_enc_ctx_allocated)
2499                     break;
2500
2501                 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2502                     if (mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2503                         break;
2504                 }
2505
2506                 if (!s2->pict_type) {
2507                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2508                     if (avctx->err_recognition & AV_EF_EXPLODE)
2509                         return AVERROR_INVALIDDATA;
2510                     break;
2511                 }
2512
2513                 if (s2->first_slice) {
2514                     s2->first_slice = 0;
2515                     if (mpeg_field_start(s2, buf, buf_size) < 0)
2516                         return -1;
2517                 }
2518                 if (!s2->current_picture_ptr) {
2519                     av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2520                     return AVERROR_INVALIDDATA;
2521                 }
2522
2523                 if (uses_vdpau(avctx)) {
2524                     s->slice_count++;
2525                     break;
2526                 }
2527
2528                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2529                     int threshold = (s2->mb_height * s->slice_count +
2530                                      s2->slice_context_count / 2) /
2531                                     s2->slice_context_count;
2532                     av_assert0(avctx->thread_count > 1);
2533                     if (threshold <= mb_y) {
2534                         MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2535
2536                         thread_context->start_mb_y = mb_y;
2537                         thread_context->end_mb_y   = s2->mb_height;
2538                         if (s->slice_count) {
2539                             s2->thread_context[s->slice_count-1]->end_mb_y = mb_y;
2540                             ret = ff_update_duplicate_context(thread_context,
2541                                                               s2);
2542                             if (ret < 0)
2543                                 return ret;
2544                         }
2545                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2546                         s->slice_count++;
2547                     }
2548                     buf_ptr += 2; // FIXME add minimum number of bytes per slice
2549                 } else {
2550                     ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2551                     emms_c();
2552
2553                     if (ret < 0) {
2554                         if (avctx->err_recognition & AV_EF_EXPLODE)
2555                             return ret;
2556                         if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2557                             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);
2558                     } else {
2559                         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);
2560                     }
2561                 }
2562             }
2563             break;
2564         }
2565     }
2566 }
2567
2568 static int mpeg_decode_frame(AVCodecContext *avctx,
2569                              void *data, int *got_output,
2570                              AVPacket *avpkt)
2571 {
2572     const uint8_t *buf = avpkt->data;
2573     int ret;
2574     int buf_size = avpkt->size;
2575     Mpeg1Context *s = avctx->priv_data;
2576     AVFrame *picture = data;
2577     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2578     av_dlog(avctx, "fill_buffer\n");
2579
2580     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2581         /* special case for last picture */
2582         if (s2->low_delay == 0 && s2->next_picture_ptr) {
2583             int ret = av_frame_ref(picture, &s2->next_picture_ptr->f);
2584             if (ret < 0)
2585                 return ret;
2586
2587             s2->next_picture_ptr = NULL;
2588
2589             *got_output = 1;
2590         }
2591         return buf_size;
2592     }
2593
2594     if (s2->flags & CODEC_FLAG_TRUNCATED) {
2595         int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2596
2597         if (ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0)
2598             return buf_size;
2599     }
2600
2601     s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2602     if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2603                                            || s2->codec_tag == AV_RL32("BW10")
2604                                           ))
2605         vcr2_init_sequence(avctx);
2606
2607     s->slice_count = 0;
2608
2609     if (avctx->extradata && !s->extradata_decoded) {
2610         ret = decode_chunks(avctx, picture, got_output, avctx->extradata, avctx->extradata_size);
2611         if(*got_output) {
2612             av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2613             *got_output = 0;
2614         }
2615         s->extradata_decoded = 1;
2616         if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2617             s2->current_picture_ptr = NULL;
2618             return ret;
2619         }
2620     }
2621
2622     ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2623     if (ret<0 || *got_output)
2624         s2->current_picture_ptr = NULL;
2625
2626     return ret;
2627 }
2628
2629
2630 static void flush(AVCodecContext *avctx)
2631 {
2632     Mpeg1Context *s = avctx->priv_data;
2633
2634     s->sync=0;
2635
2636     ff_mpeg_flush(avctx);
2637 }
2638
2639 static int mpeg_decode_end(AVCodecContext *avctx)
2640 {
2641     Mpeg1Context *s = avctx->priv_data;
2642
2643     if (s->mpeg_enc_ctx_allocated)
2644         ff_MPV_common_end(&s->mpeg_enc_ctx);
2645     return 0;
2646 }
2647
2648 static const AVProfile mpeg2_video_profiles[] = {
2649     { FF_PROFILE_MPEG2_422,          "4:2:2"              },
2650     { FF_PROFILE_MPEG2_HIGH,         "High"               },
2651     { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
2652     { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
2653     { FF_PROFILE_MPEG2_MAIN,         "Main"               },
2654     { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
2655     { FF_PROFILE_RESERVED,           "Reserved"           },
2656     { FF_PROFILE_RESERVED,           "Reserved"           },
2657     { FF_PROFILE_UNKNOWN },
2658 };
2659
2660
2661 AVCodec ff_mpeg1video_decoder = {
2662     .name                  = "mpeg1video",
2663     .type                  = AVMEDIA_TYPE_VIDEO,
2664     .id                    = AV_CODEC_ID_MPEG1VIDEO,
2665     .priv_data_size        = sizeof(Mpeg1Context),
2666     .init                  = mpeg_decode_init,
2667     .close                 = mpeg_decode_end,
2668     .decode                = mpeg_decode_frame,
2669     .capabilities          = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2670                              CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2671                              CODEC_CAP_SLICE_THREADS,
2672     .flush                 = flush,
2673     .max_lowres            = 3,
2674     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2675     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2676 };
2677
2678 AVCodec ff_mpeg2video_decoder = {
2679     .name           = "mpeg2video",
2680     .type           = AVMEDIA_TYPE_VIDEO,
2681     .id             = AV_CODEC_ID_MPEG2VIDEO,
2682     .priv_data_size = sizeof(Mpeg1Context),
2683     .init           = mpeg_decode_init,
2684     .close          = mpeg_decode_end,
2685     .decode         = mpeg_decode_frame,
2686     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2687                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2688                       CODEC_CAP_SLICE_THREADS,
2689     .flush          = flush,
2690     .max_lowres     = 3,
2691     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2692     .profiles       = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2693 };
2694
2695 //legacy decoder
2696 AVCodec ff_mpegvideo_decoder = {
2697     .name           = "mpegvideo",
2698     .type           = AVMEDIA_TYPE_VIDEO,
2699     .id             = AV_CODEC_ID_MPEG2VIDEO,
2700     .priv_data_size = sizeof(Mpeg1Context),
2701     .init           = mpeg_decode_init,
2702     .close          = mpeg_decode_end,
2703     .decode         = mpeg_decode_frame,
2704     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2705     .flush          = flush,
2706     .max_lowres     = 3,
2707     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2708 };
2709
2710 #if CONFIG_MPEG_XVMC_DECODER
2711 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2712 {
2713     if (avctx->active_thread_type & FF_THREAD_SLICE)
2714         return -1;
2715     if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2716         return -1;
2717     if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2718         av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2719     }
2720     mpeg_decode_init(avctx);
2721
2722     avctx->pix_fmt           = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2723     avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2724
2725     return 0;
2726 }
2727
2728 AVCodec ff_mpeg_xvmc_decoder = {
2729     .name           = "mpegvideo_xvmc",
2730     .type           = AVMEDIA_TYPE_VIDEO,
2731     .id             = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2732     .priv_data_size = sizeof(Mpeg1Context),
2733     .init           = mpeg_mc_decode_init,
2734     .close          = mpeg_decode_end,
2735     .decode         = mpeg_decode_frame,
2736     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2737                       CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2738     .flush          = flush,
2739     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2740 };
2741
2742 #endif
2743
2744 #if CONFIG_MPEG_VDPAU_DECODER
2745 AVCodec ff_mpeg_vdpau_decoder = {
2746     .name           = "mpegvideo_vdpau",
2747     .type           = AVMEDIA_TYPE_VIDEO,
2748     .id             = AV_CODEC_ID_MPEG2VIDEO,
2749     .priv_data_size = sizeof(Mpeg1Context),
2750     .init           = mpeg_decode_init,
2751     .close          = mpeg_decode_end,
2752     .decode         = mpeg_decode_frame,
2753     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2754                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2755     .flush          = flush,
2756     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2757 };
2758 #endif
2759
2760 #if CONFIG_MPEG1_VDPAU_DECODER
2761 AVCodec ff_mpeg1_vdpau_decoder = {
2762     .name           = "mpeg1video_vdpau",
2763     .type           = AVMEDIA_TYPE_VIDEO,
2764     .id             = AV_CODEC_ID_MPEG1VIDEO,
2765     .priv_data_size = sizeof(Mpeg1Context),
2766     .init           = mpeg_decode_init,
2767     .close          = mpeg_decode_end,
2768     .decode         = mpeg_decode_frame,
2769     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2770                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2771     .flush          = flush,
2772     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2773 };
2774 #endif