mpeg12: print error for invalid skip cases
[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 "internal.h"
32 #include "avcodec.h"
33 #include "dsputil.h"
34 #include "mpegvideo.h"
35 #include "libavutil/avassert.h"
36 #include "libavutil/timecode.h"
37
38 #include "mpeg12.h"
39 #include "mpeg12data.h"
40 #include "mpeg12decdata.h"
41 #include "bytestream.h"
42 #include "vdpau_internal.h"
43 #include "xvmc_internal.h"
44 #include "thread.h"
45
46
47 #define MV_VLC_BITS 9
48 #define MBINCR_VLC_BITS 9
49 #define MB_PAT_VLC_BITS 9
50 #define MB_PTYPE_VLC_BITS 6
51 #define MB_BTYPE_VLC_BITS 6
52
53 static VLC mv_vlc;
54
55 /* as H.263, but only 17 codes */
56 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
57 {
58     int code, sign, val, shift;
59
60     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
61     if (code == 0) {
62         return pred;
63     }
64     if (code < 0) {
65         return 0xffff;
66     }
67
68     sign  = get_bits1(&s->gb);
69     shift = fcode - 1;
70     val   = code;
71     if (shift) {
72         val  = (val - 1) << shift;
73         val |= get_bits(&s->gb, shift);
74         val++;
75     }
76     if (sign)
77         val = -val;
78     val += pred;
79
80     /* modulo decoding */
81     return sign_extend(val, 5 + shift);
82 }
83
84 static inline int mpeg1_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n)
85 {
86     int level, dc, diff, i, j, run;
87     int component;
88     RLTable *rl = &ff_rl_mpeg1;
89     uint8_t * const scantable    = s->intra_scantable.permutated;
90     const uint16_t *quant_matrix = s->intra_matrix;
91     const int qscale             = s->qscale;
92
93     /* DC coefficient */
94     component = (n <= 3 ? 0 : n - 4 + 1);
95     diff = decode_dc(&s->gb, component);
96     if (diff >= 0xffff)
97         return -1;
98     dc  = s->last_dc[component];
99     dc += diff;
100     s->last_dc[component] = dc;
101     block[0] = dc * quant_matrix[0];
102     av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
103     i = 0;
104     {
105         OPEN_READER(re, &s->gb);
106         /* now quantify & encode AC coefficients */
107         for (;;) {
108             UPDATE_CACHE(re, &s->gb);
109             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
110
111             if (level == 127) {
112                 break;
113             } else if (level != 0) {
114                 i += run;
115                 j = scantable[i];
116                 level = (level * qscale * quant_matrix[j]) >> 4;
117                 level = (level - 1) | 1;
118                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
119                 LAST_SKIP_BITS(re, &s->gb, 1);
120             } else {
121                 /* escape */
122                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
123                 UPDATE_CACHE(re, &s->gb);
124                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
125                 if (level == -128) {
126                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
127                 } else if (level == 0) {
128                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
129                 }
130                 i += run;
131                 j = scantable[i];
132                 if (level < 0) {
133                     level = -level;
134                     level = (level * qscale * quant_matrix[j]) >> 4;
135                     level = (level - 1) | 1;
136                     level = -level;
137                 } else {
138                     level = (level * qscale * quant_matrix[j]) >> 4;
139                     level = (level - 1) | 1;
140                 }
141             }
142             if (i > 63) {
143                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
144                 return -1;
145             }
146
147             block[j] = level;
148         }
149         CLOSE_READER(re, &s->gb);
150     }
151     s->block_last_index[n] = i;
152    return 0;
153 }
154
155 int ff_mpeg1_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n)
156 {
157     return mpeg1_decode_block_intra(s, block, n);
158 }
159
160 static inline int mpeg1_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
161 {
162     int level, i, j, run;
163     RLTable *rl = &ff_rl_mpeg1;
164     uint8_t * const scantable    = s->intra_scantable.permutated;
165     const uint16_t *quant_matrix = s->inter_matrix;
166     const int qscale             = s->qscale;
167
168     {
169         OPEN_READER(re, &s->gb);
170         i = -1;
171         // special case for first coefficient, no need to add second VLC table
172         UPDATE_CACHE(re, &s->gb);
173         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
174             level = (3 * qscale * quant_matrix[0]) >> 5;
175             level = (level - 1) | 1;
176             if (GET_CACHE(re, &s->gb) & 0x40000000)
177                 level = -level;
178             block[0] = level;
179             i++;
180             SKIP_BITS(re, &s->gb, 2);
181             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
182                 goto end;
183         }
184         /* now quantify & encode AC coefficients */
185         for (;;) {
186             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
187
188             if (level != 0) {
189                 i += run;
190                 j = scantable[i];
191                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
192                 level = (level - 1) | 1;
193                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
194                 SKIP_BITS(re, &s->gb, 1);
195             } else {
196                 /* escape */
197                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
198                 UPDATE_CACHE(re, &s->gb);
199                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
200                 if (level == -128) {
201                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
202                 } else if (level == 0) {
203                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
204                 }
205                 i += run;
206                 j = scantable[i];
207                 if (level < 0) {
208                     level = -level;
209                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
210                     level = (level - 1) | 1;
211                     level = -level;
212                 } else {
213                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
214                     level = (level - 1) | 1;
215                 }
216             }
217             if (i > 63) {
218                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
219                 return -1;
220             }
221
222             block[j] = level;
223             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
224                 break;
225             UPDATE_CACHE(re, &s->gb);
226         }
227 end:
228         LAST_SKIP_BITS(re, &s->gb, 2);
229         CLOSE_READER(re, &s->gb);
230     }
231     s->block_last_index[n] = i;
232     return 0;
233 }
234
235 /**
236  * Note: this function can read out of range and crash for corrupt streams.
237  * Changing this would eat up any speed benefits it has.
238  * Do not use "fast" flag if you need the code to be robust.
239  */
240 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
241 {
242     int level, i, j, run;
243     RLTable *rl = &ff_rl_mpeg1;
244     uint8_t * const scantable = s->intra_scantable.permutated;
245     const int qscale          = s->qscale;
246
247     {
248         OPEN_READER(re, &s->gb);
249         i = -1;
250         // special case for first coefficient, no need to add second VLC table
251         UPDATE_CACHE(re, &s->gb);
252         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
253             level = (3 * qscale) >> 1;
254             level = (level - 1) | 1;
255             if (GET_CACHE(re, &s->gb) & 0x40000000)
256                 level = -level;
257             block[0] = level;
258             i++;
259             SKIP_BITS(re, &s->gb, 2);
260             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
261                 goto end;
262         }
263
264         /* now quantify & encode AC coefficients */
265         for (;;) {
266             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
267
268             if (level != 0) {
269                 i += run;
270                 j = scantable[i];
271                 level = ((level * 2 + 1) * qscale) >> 1;
272                 level = (level - 1) | 1;
273                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
274                 SKIP_BITS(re, &s->gb, 1);
275             } else {
276                 /* escape */
277                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
278                 UPDATE_CACHE(re, &s->gb);
279                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
280                 if (level == -128) {
281                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
282                 } else if (level == 0) {
283                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
284                 }
285                 i += run;
286                 j = scantable[i];
287                 if (level < 0) {
288                     level = -level;
289                     level = ((level * 2 + 1) * qscale) >> 1;
290                     level = (level - 1) | 1;
291                     level = -level;
292                 } else {
293                     level = ((level * 2 + 1) * qscale) >> 1;
294                     level = (level - 1) | 1;
295                 }
296             }
297
298             block[j] = level;
299             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
300                 break;
301             UPDATE_CACHE(re, &s->gb);
302         }
303 end:
304         LAST_SKIP_BITS(re, &s->gb, 2);
305         CLOSE_READER(re, &s->gb);
306     }
307     s->block_last_index[n] = i;
308     return 0;
309 }
310
311
312 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n)
313 {
314     int level, i, j, run;
315     RLTable *rl = &ff_rl_mpeg1;
316     uint8_t * const scantable = s->intra_scantable.permutated;
317     const uint16_t *quant_matrix;
318     const int qscale = s->qscale;
319     int mismatch;
320
321     mismatch = 1;
322
323     {
324         OPEN_READER(re, &s->gb);
325         i = -1;
326         if (n < 4)
327             quant_matrix = s->inter_matrix;
328         else
329             quant_matrix = s->chroma_inter_matrix;
330
331         // special case for first coefficient, no need to add second VLC table
332         UPDATE_CACHE(re, &s->gb);
333         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
334             level= (3 * qscale * quant_matrix[0]) >> 5;
335             if (GET_CACHE(re, &s->gb) & 0x40000000)
336                 level = -level;
337             block[0]  = level;
338             mismatch ^= level;
339             i++;
340             SKIP_BITS(re, &s->gb, 2);
341             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
342                 goto end;
343         }
344
345         /* now quantify & encode AC coefficients */
346         for (;;) {
347             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
348
349             if (level != 0) {
350                 i += run;
351                 j = scantable[i];
352                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
353                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
354                 SKIP_BITS(re, &s->gb, 1);
355             } else {
356                 /* escape */
357                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
358                 UPDATE_CACHE(re, &s->gb);
359                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
360
361                 i += run;
362                 j = scantable[i];
363                 if (level < 0) {
364                     level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
365                     level = -level;
366                 } else {
367                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
368                 }
369             }
370             if (i > 63) {
371                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
372                 return -1;
373             }
374
375             mismatch ^= level;
376             block[j]  = level;
377             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
378                 break;
379             UPDATE_CACHE(re, &s->gb);
380         }
381 end:
382         LAST_SKIP_BITS(re, &s->gb, 2);
383         CLOSE_READER(re, &s->gb);
384     }
385     block[63] ^= (mismatch & 1);
386
387     s->block_last_index[n] = i;
388     return 0;
389 }
390
391 /**
392  * Note: this function can read out of range and crash for corrupt streams.
393  * Changing this would eat up any speed benefits it has.
394  * Do not use "fast" flag if you need the code to be robust.
395  */
396 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
397                                                     DCTELEM *block, int n)
398 {
399     int level, i, j, run;
400     RLTable *rl = &ff_rl_mpeg1;
401     uint8_t * const scantable = s->intra_scantable.permutated;
402     const int qscale          = s->qscale;
403     OPEN_READER(re, &s->gb);
404     i = -1;
405
406     // special case for first coefficient, no need to add second VLC table
407     UPDATE_CACHE(re, &s->gb);
408     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
409         level = (3 * qscale) >> 1;
410         if (GET_CACHE(re, &s->gb) & 0x40000000)
411             level = -level;
412         block[0] = level;
413         i++;
414         SKIP_BITS(re, &s->gb, 2);
415         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
416             goto end;
417     }
418
419     /* now quantify & encode AC coefficients */
420     for (;;) {
421         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
422
423         if (level != 0) {
424             i += run;
425             j  = scantable[i];
426             level = ((level * 2 + 1) * qscale) >> 1;
427             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
428             SKIP_BITS(re, &s->gb, 1);
429         } else {
430             /* escape */
431             run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
432             UPDATE_CACHE(re, &s->gb);
433             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
434
435             i += run;
436             j  = scantable[i];
437             if (level < 0) {
438                 level = ((-level * 2 + 1) * qscale) >> 1;
439                 level = -level;
440             } else {
441                 level = ((level * 2 + 1) * qscale) >> 1;
442             }
443         }
444
445         block[j] = level;
446         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
447             break;
448         UPDATE_CACHE(re, &s->gb);
449     }
450 end:
451     LAST_SKIP_BITS(re, &s->gb, 2);
452     CLOSE_READER(re, &s->gb);
453     s->block_last_index[n] = i;
454     return 0;
455 }
456
457
458 static inline int mpeg2_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n)
459 {
460     int level, dc, diff, i, j, run;
461     int component;
462     RLTable *rl;
463     uint8_t * const scantable = s->intra_scantable.permutated;
464     const uint16_t *quant_matrix;
465     const int qscale = s->qscale;
466     int mismatch;
467
468     /* DC coefficient */
469     if (n < 4) {
470         quant_matrix = s->intra_matrix;
471         component = 0;
472     } else {
473         quant_matrix = s->chroma_intra_matrix;
474         component = (n & 1) + 1;
475     }
476     diff = decode_dc(&s->gb, component);
477     if (diff >= 0xffff)
478         return -1;
479     dc  = s->last_dc[component];
480     dc += diff;
481     s->last_dc[component] = dc;
482     block[0] = dc << (3 - s->intra_dc_precision);
483     av_dlog(s->avctx, "dc=%d\n", block[0]);
484     mismatch = block[0] ^ 1;
485     i = 0;
486     if (s->intra_vlc_format)
487         rl = &ff_rl_mpeg2;
488     else
489         rl = &ff_rl_mpeg1;
490
491     {
492         OPEN_READER(re, &s->gb);
493         /* now quantify & encode AC coefficients */
494         for (;;) {
495             UPDATE_CACHE(re, &s->gb);
496             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
497
498             if (level == 127) {
499                 break;
500             } else if (level != 0) {
501                 i += run;
502                 j  = scantable[i];
503                 level = (level * qscale * quant_matrix[j]) >> 4;
504                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
505                 LAST_SKIP_BITS(re, &s->gb, 1);
506             } else {
507                 /* escape */
508                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
509                 UPDATE_CACHE(re, &s->gb);
510                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
511                 i += run;
512                 j  = scantable[i];
513                 if (level < 0) {
514                     level = (-level * qscale * quant_matrix[j]) >> 4;
515                     level = -level;
516                 } else {
517                     level = (level * qscale * quant_matrix[j]) >> 4;
518                 }
519             }
520             if (i > 63) {
521                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
522                 return -1;
523             }
524
525             mismatch ^= level;
526             block[j]  = level;
527         }
528         CLOSE_READER(re, &s->gb);
529     }
530     block[63] ^= mismatch & 1;
531
532     s->block_last_index[n] = i;
533     return 0;
534 }
535
536 /**
537  * Note: this function can read out of range and crash for corrupt streams.
538  * Changing this would eat up any speed benefits it has.
539  * Do not use "fast" flag if you need the code to be robust.
540  */
541 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n)
542 {
543     int level, dc, diff, j, run;
544     int component;
545     RLTable *rl;
546     uint8_t * scantable = s->intra_scantable.permutated;
547     const uint16_t *quant_matrix;
548     const int qscale = s->qscale;
549
550     /* DC coefficient */
551     if (n < 4) {
552         quant_matrix = s->intra_matrix;
553         component = 0;
554     } else {
555         quant_matrix = s->chroma_intra_matrix;
556         component = (n & 1) + 1;
557     }
558     diff = decode_dc(&s->gb, component);
559     if (diff >= 0xffff)
560         return -1;
561     dc = s->last_dc[component];
562     dc += diff;
563     s->last_dc[component] = dc;
564     block[0] = dc << (3 - s->intra_dc_precision);
565     if (s->intra_vlc_format)
566         rl = &ff_rl_mpeg2;
567     else
568         rl = &ff_rl_mpeg1;
569
570     {
571         OPEN_READER(re, &s->gb);
572         /* now quantify & encode AC coefficients */
573         for (;;) {
574             UPDATE_CACHE(re, &s->gb);
575             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
576
577             if (level == 127) {
578                 break;
579             } else if (level != 0) {
580                 scantable += run;
581                 j = *scantable;
582                 level = (level * qscale * quant_matrix[j]) >> 4;
583                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
584                 LAST_SKIP_BITS(re, &s->gb, 1);
585             } else {
586                 /* escape */
587                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
588                 UPDATE_CACHE(re, &s->gb);
589                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
590                 scantable += run;
591                 j = *scantable;
592                 if (level < 0) {
593                     level = (-level * qscale * quant_matrix[j]) >> 4;
594                     level = -level;
595                 } else {
596                     level = (level * qscale * quant_matrix[j]) >> 4;
597                 }
598             }
599
600             block[j] = level;
601         }
602         CLOSE_READER(re, &s->gb);
603     }
604
605     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
606     return 0;
607 }
608
609 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
610
611 #define INIT_2D_VLC_RL(rl, static_size)\
612 {\
613     static RL_VLC_ELEM rl_vlc_table[static_size];\
614     INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
615                     &rl.table_vlc[0][1], 4, 2,\
616                     &rl.table_vlc[0][0], 4, 2, static_size);\
617 \
618     rl.rl_vlc[0] = rl_vlc_table;\
619     init_2d_vlc_rl(&rl);\
620 }
621
622 static void init_2d_vlc_rl(RLTable *rl)
623 {
624     int i;
625
626     for (i = 0; i < rl->vlc.table_size; i++) {
627         int code = rl->vlc.table[i][0];
628         int len  = rl->vlc.table[i][1];
629         int level, run;
630
631         if (len == 0) { // illegal code
632             run   = 65;
633             level = MAX_LEVEL;
634         } else if (len<0) { //more bits needed
635             run   = 0;
636             level = code;
637         } else {
638             if (code == rl->n) { //esc
639                 run   = 65;
640                 level = 0;
641             } else if (code == rl->n+1) { //eob
642                 run   = 0;
643                 level = 127;
644             } else {
645                 run   = rl->table_run  [code] + 1;
646                 level = rl->table_level[code];
647             }
648         }
649         rl->rl_vlc[0][i].len   = len;
650         rl->rl_vlc[0][i].level = level;
651         rl->rl_vlc[0][i].run   = run;
652     }
653 }
654
655 void ff_mpeg12_common_init(MpegEncContext *s)
656 {
657
658     s->y_dc_scale_table =
659     s->c_dc_scale_table = ff_mpeg2_dc_scale_table[s->intra_dc_precision];
660
661 }
662
663 void ff_mpeg1_clean_buffers(MpegEncContext *s)
664 {
665     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
666     s->last_dc[1] = s->last_dc[0];
667     s->last_dc[2] = s->last_dc[0];
668     memset(s->last_mv, 0, sizeof(s->last_mv));
669 }
670
671
672 /******************************************/
673 /* decoding */
674
675 VLC ff_dc_lum_vlc;
676 VLC ff_dc_chroma_vlc;
677
678 static VLC mbincr_vlc;
679 static VLC mb_ptype_vlc;
680 static VLC mb_btype_vlc;
681 static VLC mb_pat_vlc;
682
683 av_cold void ff_mpeg12_init_vlcs(void)
684 {
685     static int done = 0;
686
687     if (!done) {
688         done = 1;
689
690         INIT_VLC_STATIC(&ff_dc_lum_vlc, DC_VLC_BITS, 12,
691                         ff_mpeg12_vlc_dc_lum_bits, 1, 1,
692                         ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
693         INIT_VLC_STATIC(&ff_dc_chroma_vlc,  DC_VLC_BITS, 12,
694                         ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
695                         ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
696         INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
697                         &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
698                         &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
699         INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
700                         &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
701                         &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
702         INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
703                         &ff_mpeg12_mbPatTable[0][1], 2, 1,
704                         &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
705
706         INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
707                         &table_mb_ptype[0][1], 2, 1,
708                         &table_mb_ptype[0][0], 2, 1, 64);
709         INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
710                         &table_mb_btype[0][1], 2, 1,
711                         &table_mb_btype[0][0], 2, 1, 64);
712         ff_init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
713         ff_init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
714
715         INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
716         INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
717     }
718 }
719
720 static inline int get_dmv(MpegEncContext *s)
721 {
722     if (get_bits1(&s->gb))
723         return 1 - (get_bits1(&s->gb) << 1);
724     else
725         return 0;
726 }
727
728 static inline int get_qscale(MpegEncContext *s)
729 {
730     int qscale = get_bits(&s->gb, 5);
731     if (s->q_scale_type) {
732         return non_linear_qscale[qscale];
733     } else {
734         return qscale << 1;
735     }
736 }
737
738 static void exchange_uv(MpegEncContext *s)
739 {
740     DCTELEM (*tmp)[64];
741
742     tmp           = s->pblocks[4];
743     s->pblocks[4] = s->pblocks[5];
744     s->pblocks[5] = tmp;
745 }
746
747 /* motion type (for MPEG-2) */
748 #define MT_FIELD 1
749 #define MT_FRAME 2
750 #define MT_16X8  2
751 #define MT_DMV   3
752
753 static int mpeg_decode_mb(MpegEncContext *s, DCTELEM block[12][64])
754 {
755     int i, j, k, cbp, val, mb_type, motion_type;
756     const int mb_block_count = 4 + (1 << s->chroma_format);
757
758     av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
759
760     av_assert2(s->mb_skipped == 0);
761
762     if (s->mb_skip_run-- != 0) {
763         if (s->pict_type == AV_PICTURE_TYPE_P) {
764             s->mb_skipped = 1;
765             s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride] = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
766         } else {
767             int mb_type;
768
769             if (s->mb_x)
770                 mb_type = s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
771             else
772                 mb_type = s->current_picture.f.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1]; // FIXME not sure if this is allowed in MPEG at all
773             if (IS_INTRA(mb_type)) {
774                 av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
775                 return -1;
776             }
777             s->current_picture.f.mb_type[s->mb_x + s->mb_y*s->mb_stride] =
778                 mb_type | MB_TYPE_SKIP;
779 //            av_assert2(s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1] & (MB_TYPE_16x16 | MB_TYPE_16x8));
780
781             if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
782                 s->mb_skipped = 1;
783         }
784
785         return 0;
786     }
787
788     switch (s->pict_type) {
789     default:
790     case AV_PICTURE_TYPE_I:
791         if (get_bits1(&s->gb) == 0) {
792             if (get_bits1(&s->gb) == 0) {
793                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
794                 return -1;
795             }
796             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
797         } else {
798             mb_type = MB_TYPE_INTRA;
799         }
800         break;
801     case AV_PICTURE_TYPE_P:
802         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
803         if (mb_type < 0) {
804             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
805             return -1;
806         }
807         mb_type = ptype2mb_type[mb_type];
808         break;
809     case AV_PICTURE_TYPE_B:
810         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
811         if (mb_type < 0) {
812             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
813             return -1;
814         }
815         mb_type = btype2mb_type[mb_type];
816         break;
817     }
818     av_dlog(s->avctx, "mb_type=%x\n", mb_type);
819 //    motion_type = 0; /* avoid warning */
820     if (IS_INTRA(mb_type)) {
821         s->dsp.clear_blocks(s->block[0]);
822
823         if (!s->chroma_y_shift) {
824             s->dsp.clear_blocks(s->block[6]);
825         }
826
827         /* compute DCT type */
828         if (s->picture_structure == PICT_FRAME && // FIXME add an interlaced_dct coded var?
829             !s->frame_pred_frame_dct) {
830             s->interlaced_dct = get_bits1(&s->gb);
831         }
832
833         if (IS_QUANT(mb_type))
834             s->qscale = get_qscale(s);
835
836         if (s->concealment_motion_vectors) {
837             /* just parse them */
838             if (s->picture_structure != PICT_FRAME)
839                 skip_bits1(&s->gb); /* field select */
840
841             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
842                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
843             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
844                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
845
846             skip_bits1(&s->gb); /* marker */
847         } else
848             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
849         s->mb_intra = 1;
850         // if 1, we memcpy blocks in xvmcvideo
851         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
852             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
853             if (s->swap_uv) {
854                 exchange_uv(s);
855             }
856         }
857
858         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
859             if (s->flags2 & CODEC_FLAG2_FAST) {
860                 for (i = 0; i < 6; i++) {
861                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
862                 }
863             } else {
864                 for (i = 0; i < mb_block_count; i++) {
865                     if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
866                         return -1;
867                 }
868             }
869         } else {
870             for (i = 0; i < 6; i++) {
871                 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
872                     return -1;
873             }
874         }
875     } else {
876         if (mb_type & MB_TYPE_ZERO_MV) {
877             av_assert2(mb_type & MB_TYPE_CBP);
878
879             s->mv_dir = MV_DIR_FORWARD;
880             if (s->picture_structure == PICT_FRAME) {
881                 if (!s->frame_pred_frame_dct)
882                     s->interlaced_dct = get_bits1(&s->gb);
883                 s->mv_type = MV_TYPE_16X16;
884             } else {
885                 s->mv_type = MV_TYPE_FIELD;
886                 mb_type |= MB_TYPE_INTERLACED;
887                 s->field_select[0][0] = s->picture_structure - 1;
888             }
889
890             if (IS_QUANT(mb_type))
891                 s->qscale = get_qscale(s);
892
893             s->last_mv[0][0][0] = 0;
894             s->last_mv[0][0][1] = 0;
895             s->last_mv[0][1][0] = 0;
896             s->last_mv[0][1][1] = 0;
897             s->mv[0][0][0] = 0;
898             s->mv[0][0][1] = 0;
899         } else {
900             av_assert2(mb_type & MB_TYPE_L0L1);
901             // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
902             /* get additional motion vector type */
903             if (s->frame_pred_frame_dct)
904                 motion_type = MT_FRAME;
905             else {
906                 motion_type = get_bits(&s->gb, 2);
907                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
908                     s->interlaced_dct = get_bits1(&s->gb);
909             }
910
911             if (IS_QUANT(mb_type))
912                 s->qscale = get_qscale(s);
913
914             /* motion vectors */
915             s->mv_dir = (mb_type >> 13) & 3;
916             av_dlog(s->avctx, "motion_type=%d\n", motion_type);
917             switch (motion_type) {
918             case MT_FRAME: /* or MT_16X8 */
919                 if (s->picture_structure == PICT_FRAME) {
920                     mb_type |= MB_TYPE_16x16;
921                     s->mv_type = MV_TYPE_16X16;
922                     for (i = 0; i < 2; i++) {
923                         if (USES_LIST(mb_type, i)) {
924                             /* MT_FRAME */
925                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
926                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
927                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
928                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
929                             /* full_pel: only for MPEG-1 */
930                             if (s->full_pel[i]) {
931                                 s->mv[i][0][0] <<= 1;
932                                 s->mv[i][0][1] <<= 1;
933                             }
934                         }
935                     }
936                 } else {
937                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
938                     s->mv_type = MV_TYPE_16X8;
939                     for (i = 0; i < 2; i++) {
940                         if (USES_LIST(mb_type, i)) {
941                             /* MT_16X8 */
942                             for (j = 0; j < 2; j++) {
943                                 s->field_select[i][j] = get_bits1(&s->gb);
944                                 for (k = 0; k < 2; k++) {
945                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
946                                                              s->last_mv[i][j][k]);
947                                     s->last_mv[i][j][k] = val;
948                                     s->mv[i][j][k]      = val;
949                                 }
950                             }
951                         }
952                     }
953                 }
954                 break;
955             case MT_FIELD:
956                 s->mv_type = MV_TYPE_FIELD;
957                 if (s->picture_structure == PICT_FRAME) {
958                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
959                     for (i = 0; i < 2; i++) {
960                         if (USES_LIST(mb_type, i)) {
961                             for (j = 0; j < 2; j++) {
962                                 s->field_select[i][j] = get_bits1(&s->gb);
963                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
964                                                          s->last_mv[i][j][0]);
965                                 s->last_mv[i][j][0] = val;
966                                 s->mv[i][j][0]      = val;
967                                 av_dlog(s->avctx, "fmx=%d\n", val);
968                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
969                                                          s->last_mv[i][j][1] >> 1);
970                                 s->last_mv[i][j][1] = val << 1;
971                                 s->mv[i][j][1]      = val;
972                                 av_dlog(s->avctx, "fmy=%d\n", val);
973                             }
974                         }
975                     }
976                 } else {
977                     av_assert0(!s->progressive_sequence);
978                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
979                     for (i = 0; i < 2; i++) {
980                         if (USES_LIST(mb_type, i)) {
981                             s->field_select[i][0] = get_bits1(&s->gb);
982                             for (k = 0; k < 2; k++) {
983                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
984                                                          s->last_mv[i][0][k]);
985                                 s->last_mv[i][0][k] = val;
986                                 s->last_mv[i][1][k] = val;
987                                 s->mv[i][0][k]      = val;
988                             }
989                         }
990                     }
991                 }
992                 break;
993             case MT_DMV:
994                 if(s->progressive_sequence){
995                     av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
996                     return -1;
997                 }
998                 s->mv_type = MV_TYPE_DMV;
999                 for (i = 0; i < 2; i++) {
1000                     if (USES_LIST(mb_type, i)) {
1001                         int dmx, dmy, mx, my, m;
1002                         const int my_shift = s->picture_structure == PICT_FRAME;
1003
1004                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1005                                                 s->last_mv[i][0][0]);
1006                         s->last_mv[i][0][0] = mx;
1007                         s->last_mv[i][1][0] = mx;
1008                         dmx = get_dmv(s);
1009                         my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1010                                                  s->last_mv[i][0][1] >> my_shift);
1011                         dmy = get_dmv(s);
1012
1013
1014                         s->last_mv[i][0][1] = my << my_shift;
1015                         s->last_mv[i][1][1] = my << my_shift;
1016
1017                         s->mv[i][0][0] = mx;
1018                         s->mv[i][0][1] = my;
1019                         s->mv[i][1][0] = mx; // not used
1020                         s->mv[i][1][1] = my; // not used
1021
1022                         if (s->picture_structure == PICT_FRAME) {
1023                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1024
1025                             // m = 1 + 2 * s->top_field_first;
1026                             m = s->top_field_first ? 1 : 3;
1027
1028                             /* top -> top pred */
1029                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1030                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1031                             m = 4 - m;
1032                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1033                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1034                         } else {
1035                             mb_type |= MB_TYPE_16x16;
1036
1037                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1038                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1039                             if (s->picture_structure == PICT_TOP_FIELD)
1040                                 s->mv[i][2][1]--;
1041                             else
1042                                 s->mv[i][2][1]++;
1043                         }
1044                     }
1045                 }
1046                 break;
1047             default:
1048                 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1049                 return -1;
1050             }
1051         }
1052
1053         s->mb_intra = 0;
1054         if (HAS_CBP(mb_type)) {
1055             s->dsp.clear_blocks(s->block[0]);
1056
1057             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1058             if (mb_block_count > 6) {
1059                  cbp <<= mb_block_count - 6;
1060                  cbp  |= get_bits(&s->gb, mb_block_count - 6);
1061                  s->dsp.clear_blocks(s->block[6]);
1062             }
1063             if (cbp <= 0) {
1064                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1065                 return -1;
1066             }
1067
1068             //if 1, we memcpy blocks in xvmcvideo
1069             if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
1070                 ff_xvmc_pack_pblocks(s, cbp);
1071                 if (s->swap_uv) {
1072                     exchange_uv(s);
1073                 }
1074             }
1075
1076             if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1077                 if (s->flags2 & CODEC_FLAG2_FAST) {
1078                     for (i = 0; i < 6; i++) {
1079                         if (cbp & 32) {
1080                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1081                         } else {
1082                             s->block_last_index[i] = -1;
1083                         }
1084                         cbp += cbp;
1085                     }
1086                 } else {
1087                     cbp <<= 12-mb_block_count;
1088
1089                     for (i = 0; i < mb_block_count; i++) {
1090                         if (cbp & (1 << 11)) {
1091                             if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
1092                                 return -1;
1093                         } else {
1094                             s->block_last_index[i] = -1;
1095                         }
1096                         cbp += cbp;
1097                     }
1098                 }
1099             } else {
1100                 if (s->flags2 & CODEC_FLAG2_FAST) {
1101                     for (i = 0; i < 6; i++) {
1102                         if (cbp & 32) {
1103                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1104                         } else {
1105                             s->block_last_index[i] = -1;
1106                         }
1107                         cbp += cbp;
1108                     }
1109                 } else {
1110                     for (i = 0; i < 6; i++) {
1111                         if (cbp & 32) {
1112                             if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
1113                                 return -1;
1114                         } else {
1115                             s->block_last_index[i] = -1;
1116                         }
1117                         cbp += cbp;
1118                     }
1119                 }
1120             }
1121         } else {
1122             for (i = 0; i < 12; i++)
1123                 s->block_last_index[i] = -1;
1124         }
1125     }
1126
1127     s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1128
1129     return 0;
1130 }
1131
1132 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1133 {
1134     Mpeg1Context *s = avctx->priv_data;
1135     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1136     int i;
1137
1138     /* we need some permutation to store matrices,
1139      * until MPV_common_init() sets the real permutation. */
1140     for (i = 0; i < 64; i++)
1141        s2->dsp.idct_permutation[i]=i;
1142
1143     ff_MPV_decode_defaults(s2);
1144
1145     s->mpeg_enc_ctx.avctx  = avctx;
1146     s->mpeg_enc_ctx.flags  = avctx->flags;
1147     s->mpeg_enc_ctx.flags2 = avctx->flags2;
1148     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1149     ff_mpeg12_init_vlcs();
1150
1151     s->mpeg_enc_ctx_allocated      = 0;
1152     s->mpeg_enc_ctx.picture_number = 0;
1153     s->repeat_field                = 0;
1154     s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1155     avctx->color_range = AVCOL_RANGE_MPEG;
1156     if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1157         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1158     else
1159         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1160     return 0;
1161 }
1162
1163 static int mpeg_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
1164 {
1165     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1166     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1167     int err;
1168
1169     if (avctx == avctx_from || !ctx_from->mpeg_enc_ctx_allocated || !s1->context_initialized)
1170         return 0;
1171
1172     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1173     if (err) return err;
1174
1175     if (!ctx->mpeg_enc_ctx_allocated)
1176         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1177
1178     if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1179         s->picture_number++;
1180
1181     return 0;
1182 }
1183
1184 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1185                                  const uint8_t *new_perm)
1186 {
1187     uint16_t temp_matrix[64];
1188     int i;
1189
1190     memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1191
1192     for (i = 0; i < 64; i++) {
1193         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1194     }
1195 }
1196
1197 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1198 #if CONFIG_MPEG_XVMC_DECODER
1199     AV_PIX_FMT_XVMC_MPEG2_IDCT,
1200     AV_PIX_FMT_XVMC_MPEG2_MC,
1201 #endif
1202 #if CONFIG_MPEG1_VDPAU_HWACCEL
1203     AV_PIX_FMT_VDPAU_MPEG1,
1204 #endif
1205     AV_PIX_FMT_YUV420P,
1206     AV_PIX_FMT_NONE
1207 };
1208
1209 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1210 #if CONFIG_MPEG_XVMC_DECODER
1211     AV_PIX_FMT_XVMC_MPEG2_IDCT,
1212     AV_PIX_FMT_XVMC_MPEG2_MC,
1213 #endif
1214 #if CONFIG_MPEG2_VDPAU_HWACCEL
1215     AV_PIX_FMT_VDPAU_MPEG2,
1216 #endif
1217 #if CONFIG_MPEG2_DXVA2_HWACCEL
1218     AV_PIX_FMT_DXVA2_VLD,
1219 #endif
1220 #if CONFIG_MPEG2_VAAPI_HWACCEL
1221     AV_PIX_FMT_VAAPI_VLD,
1222 #endif
1223     AV_PIX_FMT_YUV420P,
1224     AV_PIX_FMT_NONE
1225 };
1226
1227 static inline int uses_vdpau(AVCodecContext *avctx) {
1228     return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1229 }
1230
1231 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1232 {
1233     Mpeg1Context *s1 = avctx->priv_data;
1234     MpegEncContext *s = &s1->mpeg_enc_ctx;
1235
1236     if(s->chroma_format < 2) {
1237         enum AVPixelFormat res;
1238         res = avctx->get_format(avctx,
1239                                 avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1240                                 mpeg1_hwaccel_pixfmt_list_420 :
1241                                 mpeg2_hwaccel_pixfmt_list_420);
1242         if (res != AV_PIX_FMT_XVMC_MPEG2_IDCT && res != AV_PIX_FMT_XVMC_MPEG2_MC) {
1243             avctx->xvmc_acceleration = 0;
1244         } else if (!avctx->xvmc_acceleration) {
1245             avctx->xvmc_acceleration = 2;
1246         }
1247         return res;
1248     } else if(s->chroma_format == 2)
1249         return AV_PIX_FMT_YUV422P;
1250     else
1251         return AV_PIX_FMT_YUV444P;
1252 }
1253
1254 /* Call this function when we know all parameters.
1255  * It may be called in different places for MPEG-1 and MPEG-2. */
1256 static int mpeg_decode_postinit(AVCodecContext *avctx)
1257 {
1258     Mpeg1Context *s1 = avctx->priv_data;
1259     MpegEncContext *s = &s1->mpeg_enc_ctx;
1260     uint8_t old_permutation[64];
1261
1262     if ((s1->mpeg_enc_ctx_allocated == 0) ||
1263         avctx->coded_width  != s->width   ||
1264         avctx->coded_height != s->height  ||
1265         s1->save_width           != s->width                ||
1266         s1->save_height          != s->height               ||
1267         s1->save_aspect_info     != s->aspect_ratio_info    ||
1268         s1->save_progressive_seq != s->progressive_sequence ||
1269         0)
1270     {
1271
1272         if (s1->mpeg_enc_ctx_allocated) {
1273             ParseContext pc = s->parse_context;
1274             s->parse_context.buffer = 0;
1275             ff_MPV_common_end(s);
1276             s->parse_context = pc;
1277         }
1278
1279         if ((s->width == 0) || (s->height == 0))
1280             return -2;
1281
1282         avcodec_set_dimensions(avctx, s->width, s->height);
1283         if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1284             avctx->rc_max_rate = s->bit_rate;
1285         } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1286                    (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1287             avctx->bit_rate = s->bit_rate;
1288         }
1289         s1->save_aspect_info     = s->aspect_ratio_info;
1290         s1->save_width           = s->width;
1291         s1->save_height          = s->height;
1292         s1->save_progressive_seq = s->progressive_sequence;
1293
1294         /* low_delay may be forced, in this case we will have B-frames
1295          * that behave like P-frames. */
1296         avctx->has_b_frames = !s->low_delay;
1297
1298         if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1299             //MPEG-1 fps
1300             avctx->time_base.den = ff_mpeg12_frame_rate_tab[s->frame_rate_index].num;
1301             avctx->time_base.num = ff_mpeg12_frame_rate_tab[s->frame_rate_index].den;
1302             //MPEG-1 aspect
1303             avctx->sample_aspect_ratio = av_d2q(1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1304             avctx->ticks_per_frame=1;
1305         } else {//MPEG-2
1306         //MPEG-2 fps
1307             av_reduce(&s->avctx->time_base.den,
1308                       &s->avctx->time_base.num,
1309                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1310                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1311                       1 << 30);
1312             avctx->ticks_per_frame = 2;
1313             //MPEG-2 aspect
1314             if (s->aspect_ratio_info > 1) {
1315                 AVRational dar =
1316                     av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1317                                       (AVRational) {s1->pan_scan.width, s1->pan_scan.height}),
1318                              (AVRational) {s->width, s->height});
1319
1320                 // we ignore the spec here and guess a bit as reality does not match the spec, see for example
1321                 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1322                 // issue1613, 621, 562
1323                 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1324                    (av_cmp_q(dar, (AVRational) {4, 3}) && av_cmp_q(dar, (AVRational) {16, 9}))) {
1325                     s->avctx->sample_aspect_ratio =
1326                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1327                                  (AVRational) {s->width, s->height});
1328                 } else {
1329                     s->avctx->sample_aspect_ratio =
1330                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1331                                  (AVRational) {s1->pan_scan.width, s1->pan_scan.height});
1332 //issue1613 4/3 16/9 -> 16/9
1333 //res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1334 //widescreen-issue562.mpg 4/3 16/9 -> 16/9
1335 //                    s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1336                     av_dlog(avctx, "A %d/%d\n",
1337                             ff_mpeg2_aspect[s->aspect_ratio_info].num, ff_mpeg2_aspect[s->aspect_ratio_info].den);
1338                     av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1339                             s->avctx->sample_aspect_ratio.den);
1340                 }
1341             } else {
1342                 s->avctx->sample_aspect_ratio =
1343                     ff_mpeg2_aspect[s->aspect_ratio_info];
1344             }
1345         } // MPEG-2
1346
1347         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1348         avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1349         // until then pix_fmt may be changed right after codec init
1350         if (avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT ||
1351             avctx->hwaccel )
1352             if (avctx->idct_algo == FF_IDCT_AUTO)
1353                 avctx->idct_algo = FF_IDCT_SIMPLE;
1354
1355         /* Quantization matrices may need reordering
1356          * if DCT permutation is changed. */
1357         memcpy(old_permutation, s->dsp.idct_permutation, 64 * sizeof(uint8_t));
1358
1359         if (ff_MPV_common_init(s) < 0)
1360             return -2;
1361
1362         quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->dsp.idct_permutation);
1363         quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->dsp.idct_permutation);
1364         quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->dsp.idct_permutation);
1365         quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->dsp.idct_permutation);
1366
1367         s1->mpeg_enc_ctx_allocated = 1;
1368     }
1369     return 0;
1370 }
1371
1372 static int mpeg1_decode_picture(AVCodecContext *avctx,
1373                                 const uint8_t *buf, int buf_size)
1374 {
1375     Mpeg1Context *s1 = avctx->priv_data;
1376     MpegEncContext *s = &s1->mpeg_enc_ctx;
1377     int ref, f_code, vbv_delay;
1378
1379     init_get_bits(&s->gb, buf, buf_size*8);
1380
1381     ref = get_bits(&s->gb, 10); /* temporal ref */
1382     s->pict_type = get_bits(&s->gb, 3);
1383     if (s->pict_type == 0 || s->pict_type > 3)
1384         return -1;
1385
1386     vbv_delay = get_bits(&s->gb, 16);
1387     s->vbv_delay = vbv_delay;
1388     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
1389         s->full_pel[0] = get_bits1(&s->gb);
1390         f_code = get_bits(&s->gb, 3);
1391         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1392             return -1;
1393         f_code += !f_code;
1394         s->mpeg_f_code[0][0] = f_code;
1395         s->mpeg_f_code[0][1] = f_code;
1396     }
1397     if (s->pict_type == AV_PICTURE_TYPE_B) {
1398         s->full_pel[1] = get_bits1(&s->gb);
1399         f_code = get_bits(&s->gb, 3);
1400         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1401             return -1;
1402         f_code += !f_code;
1403         s->mpeg_f_code[1][0] = f_code;
1404         s->mpeg_f_code[1][1] = f_code;
1405     }
1406     s->current_picture.f.pict_type = s->pict_type;
1407     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1408
1409     if (avctx->debug & FF_DEBUG_PICT_INFO)
1410         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1411
1412     s->y_dc_scale = 8;
1413     s->c_dc_scale = 8;
1414     return 0;
1415 }
1416
1417 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1418 {
1419     MpegEncContext *s= &s1->mpeg_enc_ctx;
1420     int horiz_size_ext, vert_size_ext;
1421     int bit_rate_ext;
1422
1423     skip_bits(&s->gb, 1); /* profile and level esc*/
1424     s->avctx->profile       = get_bits(&s->gb, 3);
1425     s->avctx->level         = get_bits(&s->gb, 4);
1426     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1427     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1428     horiz_size_ext          = get_bits(&s->gb, 2);
1429     vert_size_ext           = get_bits(&s->gb, 2);
1430     s->width  |= (horiz_size_ext << 12);
1431     s->height |= (vert_size_ext  << 12);
1432     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1433     s->bit_rate += (bit_rate_ext << 18) * 400;
1434     skip_bits1(&s->gb); /* marker */
1435     s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1436
1437     s->low_delay = get_bits1(&s->gb);
1438     if (s->flags & CODEC_FLAG_LOW_DELAY)
1439         s->low_delay = 1;
1440
1441     s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1442     s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1443
1444     av_dlog(s->avctx, "sequence extension\n");
1445     s->codec_id      = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1446
1447     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1448         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1449                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1450
1451 }
1452
1453 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1454 {
1455     MpegEncContext *s = &s1->mpeg_enc_ctx;
1456     int color_description, w, h;
1457
1458     skip_bits(&s->gb, 3); /* video format */
1459     color_description = get_bits1(&s->gb);
1460     if (color_description) {
1461         s->avctx->color_primaries = get_bits(&s->gb, 8);
1462         s->avctx->color_trc       = get_bits(&s->gb, 8);
1463         s->avctx->colorspace      = get_bits(&s->gb, 8);
1464     }
1465     w = get_bits(&s->gb, 14);
1466     skip_bits(&s->gb, 1); //marker
1467     h = get_bits(&s->gb, 14);
1468     // remaining 3 bits are zero padding
1469
1470     s1->pan_scan.width  = 16 * w;
1471     s1->pan_scan.height = 16 * h;
1472
1473     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1474         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1475 }
1476
1477 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1478 {
1479     MpegEncContext *s = &s1->mpeg_enc_ctx;
1480     int i, nofco;
1481
1482     nofco = 1;
1483     if (s->progressive_sequence) {
1484         if (s->repeat_first_field) {
1485             nofco++;
1486             if (s->top_field_first)
1487                 nofco++;
1488         }
1489     } else {
1490         if (s->picture_structure == PICT_FRAME) {
1491             nofco++;
1492             if (s->repeat_first_field)
1493                 nofco++;
1494         }
1495     }
1496     for (i = 0; i < nofco; i++) {
1497         s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1498         skip_bits(&s->gb, 1); // marker
1499         s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1500         skip_bits(&s->gb, 1); // marker
1501     }
1502
1503     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1504         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1505                s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1506                s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1507                s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1508 }
1509
1510 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra)
1511 {
1512     int i;
1513
1514     for (i = 0; i < 64; i++) {
1515         int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1516         int v = get_bits(&s->gb, 8);
1517         if (v == 0) {
1518             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1519             return -1;
1520         }
1521         if (intra && i == 0 && v != 8) {
1522             av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1523             v = 8; // needed by pink.mpg / issue1046
1524         }
1525         matrix0[j] = v;
1526         if (matrix1)
1527             matrix1[j] = v;
1528     }
1529     return 0;
1530 }
1531
1532 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1533 {
1534     av_dlog(s->avctx, "matrix extension\n");
1535
1536     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1537     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1538     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL           , 1);
1539     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL           , 0);
1540 }
1541
1542 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1543 {
1544     MpegEncContext *s = &s1->mpeg_enc_ctx;
1545
1546     s->full_pel[0] = s->full_pel[1] = 0;
1547     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1548     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1549     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1550     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1551     if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1552         av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1553         if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1554             if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1555                 s->pict_type = AV_PICTURE_TYPE_I;
1556             else
1557                 s->pict_type = AV_PICTURE_TYPE_P;
1558         } else
1559             s->pict_type = AV_PICTURE_TYPE_B;
1560         s->current_picture.f.pict_type = s->pict_type;
1561         s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1562     }
1563     s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1564     s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1565     s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1566     s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1567
1568     s->intra_dc_precision         = get_bits(&s->gb, 2);
1569     s->picture_structure          = get_bits(&s->gb, 2);
1570     s->top_field_first            = get_bits1(&s->gb);
1571     s->frame_pred_frame_dct       = get_bits1(&s->gb);
1572     s->concealment_motion_vectors = get_bits1(&s->gb);
1573     s->q_scale_type               = get_bits1(&s->gb);
1574     s->intra_vlc_format           = get_bits1(&s->gb);
1575     s->alternate_scan             = get_bits1(&s->gb);
1576     s->repeat_first_field         = get_bits1(&s->gb);
1577     s->chroma_420_type            = get_bits1(&s->gb);
1578     s->progressive_frame          = get_bits1(&s->gb);
1579
1580
1581     if (s->alternate_scan) {
1582         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1583         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1584     } else {
1585         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1586         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1587     }
1588
1589     /* composite display not parsed */
1590     av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1591     av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1592     av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1593     av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1594     av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1595     av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1596     av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1597     av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1598     av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1599 }
1600
1601 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1602 {
1603     AVCodecContext *avctx = s->avctx;
1604     Mpeg1Context *s1 = (Mpeg1Context*)s;
1605
1606     /* start frame decoding */
1607     if (s->first_field || s->picture_structure == PICT_FRAME) {
1608         if (ff_MPV_frame_start(s, avctx) < 0)
1609             return -1;
1610
1611         ff_er_frame_start(s);
1612
1613         /* first check if we must repeat the frame */
1614         s->current_picture_ptr->f.repeat_pict = 0;
1615         if (s->repeat_first_field) {
1616             if (s->progressive_sequence) {
1617                 if (s->top_field_first)
1618                     s->current_picture_ptr->f.repeat_pict = 4;
1619                 else
1620                     s->current_picture_ptr->f.repeat_pict = 2;
1621             } else if (s->progressive_frame) {
1622                 s->current_picture_ptr->f.repeat_pict = 1;
1623             }
1624         }
1625
1626         *s->current_picture_ptr->f.pan_scan = s1->pan_scan;
1627
1628         if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1629             ff_thread_finish_setup(avctx);
1630     } else { // second field
1631         int i;
1632
1633         if (!s->current_picture_ptr) {
1634             av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1635             return -1;
1636         }
1637
1638         if (s->avctx->hwaccel &&
1639             (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1640             if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1641                 av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode first field\n");
1642         }
1643
1644         for (i = 0; i < 4; i++) {
1645             s->current_picture.f.data[i] = s->current_picture_ptr->f.data[i];
1646             if (s->picture_structure == PICT_BOTTOM_FIELD) {
1647                 s->current_picture.f.data[i] += s->current_picture_ptr->f.linesize[i];
1648             }
1649         }
1650     }
1651
1652     if (avctx->hwaccel) {
1653         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1654             return -1;
1655     }
1656
1657 // MPV_frame_start will call this function too,
1658 // but we need to call it on every field
1659     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1660         if (ff_xvmc_field_start(s, avctx) < 0)
1661             return -1;
1662
1663     return 0;
1664 }
1665
1666 #define DECODE_SLICE_ERROR -1
1667 #define DECODE_SLICE_OK     0
1668
1669 /**
1670  * Decode a slice.
1671  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1672  * @return DECODE_SLICE_ERROR if the slice is damaged,
1673  *         DECODE_SLICE_OK if this slice is OK
1674  */
1675 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1676                              const uint8_t **buf, int buf_size)
1677 {
1678     AVCodecContext *avctx = s->avctx;
1679     const int lowres      = s->avctx->lowres;
1680     const int field_pic   = s->picture_structure != PICT_FRAME;
1681
1682     s->resync_mb_x =
1683     s->resync_mb_y = -1;
1684
1685     av_assert0(mb_y < s->mb_height);
1686
1687     init_get_bits(&s->gb, *buf, buf_size * 8);
1688     if(s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1689         skip_bits(&s->gb, 3);
1690
1691     ff_mpeg1_clean_buffers(s);
1692     s->interlaced_dct = 0;
1693
1694     s->qscale = get_qscale(s);
1695
1696     if (s->qscale == 0) {
1697         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1698         return -1;
1699     }
1700
1701     /* extra slice info */
1702     while (get_bits1(&s->gb) != 0) {
1703         skip_bits(&s->gb, 8);
1704     }
1705
1706     s->mb_x = 0;
1707
1708     if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1709         skip_bits1(&s->gb);
1710     } else {
1711         while (get_bits_left(&s->gb) > 0) {
1712             int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1713             if (code < 0) {
1714                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1715                 return -1;
1716             }
1717             if (code >= 33) {
1718                 if (code == 33) {
1719                     s->mb_x += 33;
1720                 }
1721                 /* otherwise, stuffing, nothing to do */
1722             } else {
1723                 s->mb_x += code;
1724                 break;
1725             }
1726         }
1727     }
1728
1729     if (s->mb_x >= (unsigned)s->mb_width) {
1730         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1731         return -1;
1732     }
1733
1734     if (avctx->hwaccel) {
1735         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1736         int start_code = -1;
1737         buf_end = avpriv_mpv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1738         if (buf_end < *buf + buf_size)
1739             buf_end -= 4;
1740         s->mb_y = mb_y;
1741         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1742             return DECODE_SLICE_ERROR;
1743         *buf = buf_end;
1744         return DECODE_SLICE_OK;
1745     }
1746
1747     s->resync_mb_x = s->mb_x;
1748     s->resync_mb_y = s->mb_y = mb_y;
1749     s->mb_skip_run = 0;
1750     ff_init_block_index(s);
1751
1752     if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1753         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1754              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",
1755                     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],
1756                     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")),
1757                     s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1758                     s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1759                     s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1760         }
1761     }
1762
1763     for (;;) {
1764         // If 1, we memcpy blocks in xvmcvideo.
1765         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1766             ff_xvmc_init_block(s); // set s->block
1767
1768         if (mpeg_decode_mb(s, s->block) < 0)
1769             return -1;
1770
1771         if (s->current_picture.f.motion_val[0] && !s->encoding) { // note motion_val is normally NULL unless we want to extract the MVs
1772             const int wrap = s->b8_stride;
1773             int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1774             int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1775             int motion_x, motion_y, dir, i;
1776
1777             for (i = 0; i < 2; i++) {
1778                 for (dir = 0; dir < 2; dir++) {
1779                     if (s->mb_intra || (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1780                         motion_x = motion_y = 0;
1781                     } else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1782                         motion_x = s->mv[dir][0][0];
1783                         motion_y = s->mv[dir][0][1];
1784                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1785                         motion_x = s->mv[dir][i][0];
1786                         motion_y = s->mv[dir][i][1];
1787                     }
1788
1789                     s->current_picture.f.motion_val[dir][xy    ][0] = motion_x;
1790                     s->current_picture.f.motion_val[dir][xy    ][1] = motion_y;
1791                     s->current_picture.f.motion_val[dir][xy + 1][0] = motion_x;
1792                     s->current_picture.f.motion_val[dir][xy + 1][1] = motion_y;
1793                     s->current_picture.f.ref_index [dir][b8_xy    ] =
1794                     s->current_picture.f.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1795                     av_assert2(s->field_select[dir][i] == 0 || s->field_select[dir][i] == 1);
1796                 }
1797                 xy += wrap;
1798                 b8_xy +=2;
1799             }
1800         }
1801
1802         s->dest[0] += 16 >> lowres;
1803         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1804         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1805
1806         ff_MPV_decode_mb(s, s->block);
1807
1808         if (++s->mb_x >= s->mb_width) {
1809             const int mb_size = 16 >> s->avctx->lowres;
1810
1811             ff_draw_horiz_band(s, mb_size*(s->mb_y >> field_pic), mb_size);
1812             ff_MPV_report_decode_progress(s);
1813
1814             s->mb_x = 0;
1815             s->mb_y += 1 << field_pic;
1816
1817             if (s->mb_y >= s->mb_height) {
1818                 int left   = get_bits_left(&s->gb);
1819                 int is_d10 = s->chroma_format == 2 && s->pict_type == AV_PICTURE_TYPE_I && avctx->profile == 0 && avctx->level == 5
1820                              && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1821                              && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1822
1823                 if (left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1824                     || ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1825                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1826                     return -1;
1827                 } else
1828                     goto eos;
1829             }
1830
1831             ff_init_block_index(s);
1832         }
1833
1834         /* skip mb handling */
1835         if (s->mb_skip_run == -1) {
1836             /* read increment again */
1837             s->mb_skip_run = 0;
1838             for (;;) {
1839                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1840                 if (code < 0) {
1841                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1842                     return -1;
1843                 }
1844                 if (code >= 33) {
1845                     if (code == 33) {
1846                         s->mb_skip_run += 33;
1847                     } else if (code == 35) {
1848                         if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1849                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1850                             return -1;
1851                         }
1852                         goto eos; /* end of slice */
1853                     }
1854                     /* otherwise, stuffing, nothing to do */
1855                 } else {
1856                     s->mb_skip_run += code;
1857                     break;
1858                 }
1859             }
1860             if (s->mb_skip_run) {
1861                 int i;
1862                 if (s->pict_type == AV_PICTURE_TYPE_I) {
1863                     av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1864                     return -1;
1865                 }
1866
1867                 /* skip mb */
1868                 s->mb_intra = 0;
1869                 for (i = 0; i < 12; i++)
1870                     s->block_last_index[i] = -1;
1871                 if (s->picture_structure == PICT_FRAME)
1872                     s->mv_type = MV_TYPE_16X16;
1873                 else
1874                     s->mv_type = MV_TYPE_FIELD;
1875                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1876                     /* if P type, zero motion vector is implied */
1877                     s->mv_dir             = MV_DIR_FORWARD;
1878                     s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1879                     s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1880                     s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1881                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1882                 } else {
1883                     /* if B type, reuse previous vectors and directions */
1884                     s->mv[0][0][0] = s->last_mv[0][0][0];
1885                     s->mv[0][0][1] = s->last_mv[0][0][1];
1886                     s->mv[1][0][0] = s->last_mv[1][0][0];
1887                     s->mv[1][0][1] = s->last_mv[1][0][1];
1888                 }
1889             }
1890         }
1891     }
1892 eos: // end of slice
1893     *buf += (get_bits_count(&s->gb)-1)/8;
1894     av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1895     return 0;
1896 }
1897
1898 static int slice_decode_thread(AVCodecContext *c, void *arg)
1899 {
1900     MpegEncContext *s   = *(void**)arg;
1901     const uint8_t *buf  = s->gb.buffer;
1902     int mb_y            = s->start_mb_y;
1903     const int field_pic = s->picture_structure != PICT_FRAME;
1904
1905     s->error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1906
1907     for (;;) {
1908         uint32_t start_code;
1909         int ret;
1910
1911         ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1912         emms_c();
1913         av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1914                 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1915                 s->start_mb_y, s->end_mb_y, s->error_count);
1916         if (ret < 0) {
1917             if (c->err_recognition & AV_EF_EXPLODE)
1918                 return ret;
1919             if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1920                 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
1921         } else {
1922             ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_AC_END | ER_DC_END | ER_MV_END);
1923         }
1924
1925         if (s->mb_y == s->end_mb_y)
1926             return 0;
1927
1928         start_code = -1;
1929         buf = avpriv_mpv_find_start_code(buf, s->gb.buffer_end, &start_code);
1930         mb_y= start_code - SLICE_MIN_START_CODE;
1931         if(s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1932             mb_y += (*buf&0xE0)<<2;
1933         mb_y <<= field_pic;
1934         if (s->picture_structure == PICT_BOTTOM_FIELD)
1935             mb_y++;
1936         if (mb_y < 0 || mb_y >= s->end_mb_y)
1937             return -1;
1938     }
1939 }
1940
1941 /**
1942  * Handle slice ends.
1943  * @return 1 if it seems to be the last slice
1944  */
1945 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1946 {
1947     Mpeg1Context *s1 = avctx->priv_data;
1948     MpegEncContext *s = &s1->mpeg_enc_ctx;
1949
1950     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1951         return 0;
1952
1953     if (s->avctx->hwaccel) {
1954         if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1955             av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1956     }
1957
1958     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1959         ff_xvmc_field_end(s);
1960
1961     /* end of slice reached */
1962     if (/*s->mb_y << field_pic == s->mb_height &&*/ !s->first_field && !s->first_slice) {
1963         /* end of image */
1964
1965         s->current_picture_ptr->f.qscale_type = FF_QSCALE_TYPE_MPEG2;
1966
1967         ff_er_frame_end(s);
1968
1969         ff_MPV_frame_end(s);
1970
1971         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
1972             *pict = s->current_picture_ptr->f;
1973             ff_print_debug_info(s, pict);
1974         } else {
1975             if (avctx->active_thread_type & FF_THREAD_FRAME)
1976                 s->picture_number++;
1977             /* latency of 1 frame for I- and P-frames */
1978             /* XXX: use another variable than picture_number */
1979             if (s->last_picture_ptr != NULL) {
1980                 *pict = s->last_picture_ptr->f;
1981                  ff_print_debug_info(s, pict);
1982             }
1983         }
1984
1985         return 1;
1986     } else {
1987         return 0;
1988     }
1989 }
1990
1991 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1992                                  const uint8_t *buf, int buf_size)
1993 {
1994     Mpeg1Context *s1 = avctx->priv_data;
1995     MpegEncContext *s = &s1->mpeg_enc_ctx;
1996     int width, height;
1997     int i, v, j;
1998
1999     init_get_bits(&s->gb, buf, buf_size*8);
2000
2001     width  = get_bits(&s->gb, 12);
2002     height = get_bits(&s->gb, 12);
2003     if (width <= 0 || height <= 0)
2004         return -1;
2005     s->aspect_ratio_info = get_bits(&s->gb, 4);
2006     if (s->aspect_ratio_info == 0) {
2007         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2008         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2009             return -1;
2010     }
2011     s->frame_rate_index = get_bits(&s->gb, 4);
2012     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2013         return -1;
2014     s->bit_rate = get_bits(&s->gb, 18) * 400;
2015     if (get_bits1(&s->gb) == 0) /* marker */
2016         return -1;
2017     s->width  = width;
2018     s->height = height;
2019
2020     s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2021     skip_bits(&s->gb, 1);
2022
2023     /* get matrix */
2024     if (get_bits1(&s->gb)) {
2025         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2026     } else {
2027         for (i = 0; i < 64; i++) {
2028             j = s->dsp.idct_permutation[i];
2029             v = ff_mpeg1_default_intra_matrix[i];
2030             s->intra_matrix[j]        = v;
2031             s->chroma_intra_matrix[j] = v;
2032         }
2033     }
2034     if (get_bits1(&s->gb)) {
2035         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2036     } else {
2037         for (i = 0; i < 64; i++) {
2038             int j = s->dsp.idct_permutation[i];
2039             v = ff_mpeg1_default_non_intra_matrix[i];
2040             s->inter_matrix[j]        = v;
2041             s->chroma_inter_matrix[j] = v;
2042         }
2043     }
2044
2045     if (show_bits(&s->gb, 23) != 0) {
2046         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2047         return -1;
2048     }
2049
2050     /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2051     s->progressive_sequence = 1;
2052     s->progressive_frame    = 1;
2053     s->picture_structure    = PICT_FRAME;
2054     s->first_field          = 0;
2055     s->frame_pred_frame_dct = 1;
2056     s->chroma_format        = 1;
2057     s->codec_id             = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2058     s->out_format           = FMT_MPEG1;
2059     s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2060     if (s->flags & CODEC_FLAG_LOW_DELAY)
2061         s->low_delay = 1;
2062
2063     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2064         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2065                s->avctx->rc_buffer_size, s->bit_rate);
2066
2067     return 0;
2068 }
2069
2070 static int vcr2_init_sequence(AVCodecContext *avctx)
2071 {
2072     Mpeg1Context *s1 = avctx->priv_data;
2073     MpegEncContext *s = &s1->mpeg_enc_ctx;
2074     int i, v;
2075
2076     /* start new MPEG-1 context decoding */
2077     s->out_format = FMT_MPEG1;
2078     if (s1->mpeg_enc_ctx_allocated) {
2079         ff_MPV_common_end(s);
2080     }
2081     s->width  = avctx->coded_width;
2082     s->height = avctx->coded_height;
2083     avctx->has_b_frames = 0; // true?
2084     s->low_delay = 1;
2085
2086     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2087     avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2088
2089     if( avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel )
2090         if (avctx->idct_algo == FF_IDCT_AUTO)
2091             avctx->idct_algo = FF_IDCT_SIMPLE;
2092
2093     if (ff_MPV_common_init(s) < 0)
2094         return -1;
2095     s1->mpeg_enc_ctx_allocated = 1;
2096
2097     for (i = 0; i < 64; i++) {
2098         int j = s->dsp.idct_permutation[i];
2099         v = ff_mpeg1_default_intra_matrix[i];
2100         s->intra_matrix[j]        = v;
2101         s->chroma_intra_matrix[j] = v;
2102
2103         v = ff_mpeg1_default_non_intra_matrix[i];
2104         s->inter_matrix[j]        = v;
2105         s->chroma_inter_matrix[j] = v;
2106     }
2107
2108     s->progressive_sequence  = 1;
2109     s->progressive_frame     = 1;
2110     s->picture_structure     = PICT_FRAME;
2111     s->first_field           = 0;
2112     s->frame_pred_frame_dct  = 1;
2113     s->chroma_format         = 1;
2114     if (s->codec_tag == AV_RL32("BW10")) {
2115         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2116     } else {
2117         exchange_uv(s); // common init reset pblocks, so we swap them here
2118         s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2119         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2120     }
2121     s1->save_width           = s->width;
2122     s1->save_height          = s->height;
2123     s1->save_progressive_seq = s->progressive_sequence;
2124     return 0;
2125 }
2126
2127
2128 static void mpeg_decode_user_data(AVCodecContext *avctx,
2129                                   const uint8_t *p, int buf_size)
2130 {
2131     Mpeg1Context *s = avctx->priv_data;
2132     const uint8_t *buf_end = p + buf_size;
2133
2134     if(buf_size > 29){
2135         int i;
2136         for(i=0; i<20; i++)
2137             if(!memcmp(p+i, "\0TMPGEXS\0", 9)){
2138                 s->tmpgexs= 1;
2139             }
2140
2141 /*        for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2142             av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2143         }
2144             av_log(avctx, AV_LOG_ERROR, "\n");*/
2145     }
2146
2147     /* we parse the DTG active format information */
2148     if (buf_end - p >= 5 &&
2149         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2150         int flags = p[4];
2151         p += 5;
2152         if (flags & 0x80) {
2153             /* skip event id */
2154             p += 2;
2155         }
2156         if (flags & 0x40) {
2157             if (buf_end - p < 1)
2158                 return;
2159             avctx->dtg_active_format = p[0] & 0x0f;
2160         }
2161     }
2162 }
2163
2164 static void mpeg_decode_gop(AVCodecContext *avctx,
2165                             const uint8_t *buf, int buf_size)
2166 {
2167     Mpeg1Context *s1  = avctx->priv_data;
2168     MpegEncContext *s = &s1->mpeg_enc_ctx;
2169     int broken_link;
2170     int64_t tc;
2171
2172     init_get_bits(&s->gb, buf, buf_size*8);
2173
2174     tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2175
2176     s->closed_gop = get_bits1(&s->gb);
2177     /*broken_link indicate that after editing the
2178       reference frames of the first B-Frames after GOP I-Frame
2179       are missing (open gop)*/
2180     broken_link = get_bits1(&s->gb);
2181
2182     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2183         char tcbuf[AV_TIMECODE_STR_SIZE];
2184         av_timecode_make_mpeg_tc_string(tcbuf, tc);
2185         av_log(s->avctx, AV_LOG_DEBUG,
2186                "GOP (%s) closed_gop=%d broken_link=%d\n",
2187                tcbuf, s->closed_gop, broken_link);
2188     }
2189 }
2190 /**
2191  * Find the end of the current frame in the bitstream.
2192  * @return the position of the first byte of the next frame, or -1
2193  */
2194 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2195 {
2196     int i;
2197     uint32_t state = pc->state;
2198
2199     /* EOF considered as end of frame */
2200     if (buf_size == 0)
2201         return 0;
2202
2203 /*
2204  0  frame start         -> 1/4
2205  1  first_SEQEXT        -> 0/2
2206  2  first field start   -> 3/0
2207  3  second_SEQEXT       -> 2/0
2208  4  searching end
2209 */
2210
2211     for (i = 0; i < buf_size; i++) {
2212         av_assert1(pc->frame_start_found >= 0 && pc->frame_start_found <= 4);
2213         if (pc->frame_start_found & 1) {
2214             if (state == EXT_START_CODE && (buf[i] & 0xF0) != 0x80)
2215                 pc->frame_start_found--;
2216             else if (state == EXT_START_CODE + 2) {
2217                 if ((buf[i] & 3) == 3)
2218                     pc->frame_start_found = 0;
2219                 else
2220                     pc->frame_start_found = (pc->frame_start_found + 1) & 3;
2221             }
2222             state++;
2223         } else {
2224             i = avpriv_mpv_find_start_code(buf + i, buf + buf_size, &state) - buf - 1;
2225             if (pc->frame_start_found == 0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE) {
2226                 i++;
2227                 pc->frame_start_found = 4;
2228             }
2229             if (state == SEQ_END_CODE) {
2230                 pc->frame_start_found = 0;
2231                 pc->state=-1;
2232                 return i+1;
2233             }
2234             if (pc->frame_start_found == 2 && state == SEQ_START_CODE)
2235                 pc->frame_start_found = 0;
2236             if (pc->frame_start_found  < 4 && state == EXT_START_CODE)
2237                 pc->frame_start_found++;
2238             if (pc->frame_start_found == 4 && (state & 0xFFFFFF00) == 0x100) {
2239                 if (state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE) {
2240                     pc->frame_start_found = 0;
2241                     pc->state             = -1;
2242                     return i - 3;
2243                 }
2244             }
2245             if (pc->frame_start_found == 0 && s && state == PICTURE_START_CODE) {
2246                 ff_fetch_timestamp(s, i - 3, 1);
2247             }
2248         }
2249     }
2250     pc->state = state;
2251     return END_NOT_FOUND;
2252 }
2253
2254 static int decode_chunks(AVCodecContext *avctx,
2255                          AVFrame *picture, int *got_output,
2256                          const uint8_t *buf, int buf_size)
2257 {
2258     Mpeg1Context *s = avctx->priv_data;
2259     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2260     const uint8_t *buf_ptr = buf;
2261     const uint8_t *buf_end = buf + buf_size;
2262     int ret, input_size;
2263     int last_code = 0;
2264
2265     for (;;) {
2266         /* find next start code */
2267         uint32_t start_code = -1;
2268         buf_ptr = avpriv_mpv_find_start_code(buf_ptr, buf_end, &start_code);
2269         if (start_code > 0x1ff) {
2270             if (s2->pict_type != AV_PICTURE_TYPE_B || avctx->skip_frame <= AVDISCARD_DEFAULT) {
2271                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2272                     int i;
2273                     av_assert0(avctx->thread_count > 1);
2274
2275                     avctx->execute(avctx, slice_decode_thread,  &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
2276                     for (i = 0; i < s->slice_count; i++)
2277                         s2->error_count += s2->thread_context[i]->error_count;
2278                 }
2279
2280                 if (CONFIG_VDPAU && uses_vdpau(avctx))
2281                     ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2282
2283
2284                 if (slice_end(avctx, picture)) {
2285                     if (s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2286                         *got_output = 1;
2287                 }
2288             }
2289             s2->pict_type = 0;
2290             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2291         }
2292
2293         input_size = buf_end - buf_ptr;
2294
2295         if (avctx->debug & FF_DEBUG_STARTCODE) {
2296             av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2297         }
2298
2299         /* prepare data for next start code */
2300         switch (start_code) {
2301         case SEQ_START_CODE:
2302             if (last_code == 0) {
2303                 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2304                 if(buf != avctx->extradata)
2305                     s->sync=1;
2306             } else {
2307                 av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2308                 if (avctx->err_recognition & AV_EF_EXPLODE)
2309                     return AVERROR_INVALIDDATA;
2310             }
2311             break;
2312
2313         case PICTURE_START_CODE:
2314             if(s->tmpgexs){
2315                 s2->intra_dc_precision= 3;
2316                 s2->intra_matrix[0]= 1;
2317             }
2318             if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) && s->slice_count) {
2319                 int i;
2320
2321                 avctx->execute(avctx, slice_decode_thread,
2322                                s2->thread_context, NULL,
2323                                s->slice_count, sizeof(void*));
2324                 for (i = 0; i < s->slice_count; i++)
2325                     s2->error_count += s2->thread_context[i]->error_count;
2326                 s->slice_count = 0;
2327             }
2328             if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2329                 ret = mpeg_decode_postinit(avctx);
2330                 if (ret < 0) {
2331                     av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
2332                     return ret;
2333                 }
2334
2335                 /* we have a complete image: we try to decompress it */
2336                 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2337                     s2->pict_type = 0;
2338                 s2->first_slice = 1;
2339                 last_code = PICTURE_START_CODE;
2340             } else {
2341                 av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
2342                 if (avctx->err_recognition & AV_EF_EXPLODE)
2343                     return AVERROR_INVALIDDATA;
2344             }
2345             break;
2346         case EXT_START_CODE:
2347             init_get_bits(&s2->gb, buf_ptr, input_size*8);
2348
2349             switch (get_bits(&s2->gb, 4)) {
2350             case 0x1:
2351                 if (last_code == 0) {
2352                 mpeg_decode_sequence_extension(s);
2353                 } else {
2354                     av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
2355                     if (avctx->err_recognition & AV_EF_EXPLODE)
2356                         return AVERROR_INVALIDDATA;
2357                 }
2358                 break;
2359             case 0x2:
2360                 mpeg_decode_sequence_display_extension(s);
2361                 break;
2362             case 0x3:
2363                 mpeg_decode_quant_matrix_extension(s2);
2364                 break;
2365             case 0x7:
2366                 mpeg_decode_picture_display_extension(s);
2367                 break;
2368             case 0x8:
2369                 if (last_code == PICTURE_START_CODE) {
2370                     mpeg_decode_picture_coding_extension(s);
2371                 } else {
2372                     av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
2373                     if (avctx->err_recognition & AV_EF_EXPLODE)
2374                         return AVERROR_INVALIDDATA;
2375                 }
2376                 break;
2377             }
2378             break;
2379         case USER_START_CODE:
2380             mpeg_decode_user_data(avctx, buf_ptr, input_size);
2381             break;
2382         case GOP_START_CODE:
2383             if (last_code == 0) {
2384                 s2->first_field=0;
2385                 mpeg_decode_gop(avctx, buf_ptr, input_size);
2386                 s->sync=1;
2387             } else {
2388                 av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
2389                 if (avctx->err_recognition & AV_EF_EXPLODE)
2390                     return AVERROR_INVALIDDATA;
2391             }
2392             break;
2393         default:
2394             if (start_code >= SLICE_MIN_START_CODE &&
2395                 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2396
2397                 if (s2->progressive_sequence && !s2->progressive_frame) {
2398                     s2->progressive_frame = 1;
2399                     av_log(s2->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
2400                 }
2401
2402                 if (s2->picture_structure == 0 || (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2403                     av_log(s2->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s2->picture_structure);
2404                     s2->picture_structure = PICT_FRAME;
2405                 }
2406
2407                 if (s2->progressive_sequence && !s2->frame_pred_frame_dct) {
2408                     av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2409                 }
2410
2411                 if (s2->picture_structure == PICT_FRAME) {
2412                     s2->first_field = 0;
2413                     s2->v_edge_pos  = 16 * s2->mb_height;
2414                 } else {
2415                     s2->first_field ^= 1;
2416                     s2->v_edge_pos   = 8 * s2->mb_height;
2417                     memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2418                 }
2419             }
2420             if (start_code >= SLICE_MIN_START_CODE &&
2421                 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2422                 const int field_pic = s2->picture_structure != PICT_FRAME;
2423                 int mb_y = start_code - SLICE_MIN_START_CODE;
2424                 last_code = SLICE_MIN_START_CODE;
2425                 if(s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2426                     mb_y += (*buf_ptr&0xE0)<<2;
2427
2428                 mb_y <<= field_pic;
2429                 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2430                     mb_y++;
2431
2432                 if (mb_y >= s2->mb_height) {
2433                     av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2434                     return -1;
2435                 }
2436
2437                 if (s2->last_picture_ptr == NULL) {
2438                 /* Skip B-frames if we do not have reference frames and gop is not closed */
2439                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
2440                         if (!s2->closed_gop)
2441                             break;
2442                     }
2443                 }
2444                 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
2445                     s->sync=1;
2446                 if (s2->next_picture_ptr == NULL) {
2447                 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2448                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) break;
2449                 }
2450                 if ((avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type == AV_PICTURE_TYPE_B) ||
2451                     (avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type != AV_PICTURE_TYPE_I) ||
2452                      avctx->skip_frame >= AVDISCARD_ALL)
2453                     break;
2454
2455                 if (!s->mpeg_enc_ctx_allocated)
2456                     break;
2457
2458                 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2459                     if (mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2460                         break;
2461                 }
2462
2463                 if (!s2->pict_type) {
2464                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2465                     if (avctx->err_recognition & AV_EF_EXPLODE)
2466                         return AVERROR_INVALIDDATA;
2467                     break;
2468                 }
2469
2470                 if (s2->first_slice) {
2471                     s2->first_slice = 0;
2472                     if (mpeg_field_start(s2, buf, buf_size) < 0)
2473                         return -1;
2474                 }
2475                 if (!s2->current_picture_ptr) {
2476                     av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2477                     return AVERROR_INVALIDDATA;
2478                 }
2479
2480                 if (uses_vdpau(avctx)) {
2481                     s->slice_count++;
2482                     break;
2483                 }
2484
2485                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2486                     int threshold = (s2->mb_height * s->slice_count +
2487                                      s2->slice_context_count / 2) /
2488                                     s2->slice_context_count;
2489                     av_assert0(avctx->thread_count > 1);
2490                     if (threshold <= mb_y) {
2491                         MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2492
2493                         thread_context->start_mb_y = mb_y;
2494                         thread_context->end_mb_y   = s2->mb_height;
2495                         if (s->slice_count) {
2496                             s2->thread_context[s->slice_count-1]->end_mb_y = mb_y;
2497                             ret = ff_update_duplicate_context(thread_context,
2498                                                               s2);
2499                             if (ret < 0)
2500                                 return ret;
2501                         }
2502                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2503                         s->slice_count++;
2504                     }
2505                     buf_ptr += 2; // FIXME add minimum number of bytes per slice
2506                 } else {
2507                     ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2508                     emms_c();
2509
2510                     if (ret < 0) {
2511                         if (avctx->err_recognition & AV_EF_EXPLODE)
2512                             return ret;
2513                         if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2514                             ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2515                     } else {
2516                         ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x-1, s2->mb_y, ER_AC_END | ER_DC_END | ER_MV_END);
2517                     }
2518                 }
2519             }
2520             break;
2521         }
2522     }
2523 }
2524
2525 static int mpeg_decode_frame(AVCodecContext *avctx,
2526                              void *data, int *got_output,
2527                              AVPacket *avpkt)
2528 {
2529     const uint8_t *buf = avpkt->data;
2530     int ret;
2531     int buf_size = avpkt->size;
2532     Mpeg1Context *s = avctx->priv_data;
2533     AVFrame *picture = data;
2534     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2535     av_dlog(avctx, "fill_buffer\n");
2536
2537     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2538         /* special case for last picture */
2539         if (s2->low_delay == 0 && s2->next_picture_ptr) {
2540             *picture = s2->next_picture_ptr->f;
2541             s2->next_picture_ptr = NULL;
2542
2543             *got_output = 1;
2544         }
2545         return buf_size;
2546     }
2547
2548     if (s2->flags & CODEC_FLAG_TRUNCATED) {
2549         int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2550
2551         if (ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0)
2552             return buf_size;
2553     }
2554
2555     s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2556     if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2557                                            || s2->codec_tag == AV_RL32("BW10")
2558                                           ))
2559         vcr2_init_sequence(avctx);
2560
2561     s->slice_count = 0;
2562
2563     if (avctx->extradata && !s->extradata_decoded) {
2564         ret = decode_chunks(avctx, picture, got_output, avctx->extradata, avctx->extradata_size);
2565         if(*got_output) {
2566             av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2567             *got_output = 0;
2568         }
2569         s->extradata_decoded = 1;
2570         if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2571             s2->current_picture_ptr = NULL;
2572             return ret;
2573         }
2574     }
2575
2576     ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2577     if (ret<0 || *got_output)
2578         s2->current_picture_ptr = NULL;
2579
2580     return ret;
2581 }
2582
2583
2584 static void flush(AVCodecContext *avctx)
2585 {
2586     Mpeg1Context *s = avctx->priv_data;
2587
2588     s->sync=0;
2589
2590     ff_mpeg_flush(avctx);
2591 }
2592
2593 static int mpeg_decode_end(AVCodecContext *avctx)
2594 {
2595     Mpeg1Context *s = avctx->priv_data;
2596
2597     if (s->mpeg_enc_ctx_allocated)
2598         ff_MPV_common_end(&s->mpeg_enc_ctx);
2599     return 0;
2600 }
2601
2602 static const AVProfile mpeg2_video_profiles[] = {
2603     { FF_PROFILE_MPEG2_422,          "4:2:2"              },
2604     { FF_PROFILE_MPEG2_HIGH,         "High"               },
2605     { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
2606     { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
2607     { FF_PROFILE_MPEG2_MAIN,         "Main"               },
2608     { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
2609     { FF_PROFILE_RESERVED,           "Reserved"           },
2610     { FF_PROFILE_RESERVED,           "Reserved"           },
2611     { FF_PROFILE_UNKNOWN },
2612 };
2613
2614
2615 AVCodec ff_mpeg1video_decoder = {
2616     .name                  = "mpeg1video",
2617     .type                  = AVMEDIA_TYPE_VIDEO,
2618     .id                    = AV_CODEC_ID_MPEG1VIDEO,
2619     .priv_data_size        = sizeof(Mpeg1Context),
2620     .init                  = mpeg_decode_init,
2621     .close                 = mpeg_decode_end,
2622     .decode                = mpeg_decode_frame,
2623     .capabilities          = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2624                              CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2625                              CODEC_CAP_SLICE_THREADS,
2626     .flush                 = flush,
2627     .max_lowres            = 3,
2628     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2629     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2630 };
2631
2632 AVCodec ff_mpeg2video_decoder = {
2633     .name           = "mpeg2video",
2634     .type           = AVMEDIA_TYPE_VIDEO,
2635     .id             = AV_CODEC_ID_MPEG2VIDEO,
2636     .priv_data_size = sizeof(Mpeg1Context),
2637     .init           = mpeg_decode_init,
2638     .close          = mpeg_decode_end,
2639     .decode         = mpeg_decode_frame,
2640     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2641                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2642                       CODEC_CAP_SLICE_THREADS,
2643     .flush          = flush,
2644     .max_lowres     = 3,
2645     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2646     .profiles       = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2647 };
2648
2649 //legacy decoder
2650 AVCodec ff_mpegvideo_decoder = {
2651     .name           = "mpegvideo",
2652     .type           = AVMEDIA_TYPE_VIDEO,
2653     .id             = AV_CODEC_ID_MPEG2VIDEO,
2654     .priv_data_size = sizeof(Mpeg1Context),
2655     .init           = mpeg_decode_init,
2656     .close          = mpeg_decode_end,
2657     .decode         = mpeg_decode_frame,
2658     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2659     .flush          = flush,
2660     .max_lowres     = 3,
2661     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2662 };
2663
2664 #if CONFIG_MPEG_XVMC_DECODER
2665 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2666 {
2667     if (avctx->active_thread_type & FF_THREAD_SLICE)
2668         return -1;
2669     if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2670         return -1;
2671     if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2672         av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2673     }
2674     mpeg_decode_init(avctx);
2675
2676     avctx->pix_fmt           = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2677     avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2678
2679     return 0;
2680 }
2681
2682 AVCodec ff_mpeg_xvmc_decoder = {
2683     .name           = "mpegvideo_xvmc",
2684     .type           = AVMEDIA_TYPE_VIDEO,
2685     .id             = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2686     .priv_data_size = sizeof(Mpeg1Context),
2687     .init           = mpeg_mc_decode_init,
2688     .close          = mpeg_decode_end,
2689     .decode         = mpeg_decode_frame,
2690     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2691                       CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2692     .flush          = flush,
2693     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2694 };
2695
2696 #endif
2697
2698 #if CONFIG_MPEG_VDPAU_DECODER
2699 AVCodec ff_mpeg_vdpau_decoder = {
2700     .name           = "mpegvideo_vdpau",
2701     .type           = AVMEDIA_TYPE_VIDEO,
2702     .id             = AV_CODEC_ID_MPEG2VIDEO,
2703     .priv_data_size = sizeof(Mpeg1Context),
2704     .init           = mpeg_decode_init,
2705     .close          = mpeg_decode_end,
2706     .decode         = mpeg_decode_frame,
2707     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2708                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2709     .flush          = flush,
2710     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2711 };
2712 #endif
2713
2714 #if CONFIG_MPEG1_VDPAU_DECODER
2715 AVCodec ff_mpeg1_vdpau_decoder = {
2716     .name           = "mpeg1video_vdpau",
2717     .type           = AVMEDIA_TYPE_VIDEO,
2718     .id             = AV_CODEC_ID_MPEG1VIDEO,
2719     .priv_data_size = sizeof(Mpeg1Context),
2720     .init           = mpeg_decode_init,
2721     .close          = mpeg_decode_end,
2722     .decode         = mpeg_decode_frame,
2723     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2724                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2725     .flush          = flush,
2726     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2727 };
2728 #endif