svq3: use hpeldsp instead of dsputil for half-pel functions.
[ffmpeg.git] / libavcodec / mpeg12.c
1 /*
2  * MPEG-1/2 decoder
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22
23 /**
24  * @file
25  * MPEG-1/2 decoder
26  */
27
28 #define UNCHECKED_BITSTREAM_READER 1
29
30 //#define DEBUG
31 #include "libavutil/avassert.h"
32 #include "libavutil/timecode.h"
33
34 #include "internal.h"
35 #include "avcodec.h"
36 #include "dsputil.h"
37 #include "mpegvideo.h"
38 #include "error_resilience.h"
39 #include "mpeg12.h"
40 #include "mpeg12data.h"
41 #include "mpeg12decdata.h"
42 #include "bytestream.h"
43 #include "vdpau_internal.h"
44 #include "xvmc_internal.h"
45 #include "thread.h"
46
47
48 #define MV_VLC_BITS 9
49 #define MBINCR_VLC_BITS 9
50 #define MB_PAT_VLC_BITS 9
51 #define MB_PTYPE_VLC_BITS 6
52 #define MB_BTYPE_VLC_BITS 6
53
54 static VLC mv_vlc;
55
56 /* as H.263, but only 17 codes */
57 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
58 {
59     int code, sign, val, shift;
60
61     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
62     if (code == 0) {
63         return pred;
64     }
65     if (code < 0) {
66         return 0xffff;
67     }
68
69     sign  = get_bits1(&s->gb);
70     shift = fcode - 1;
71     val   = code;
72     if (shift) {
73         val  = (val - 1) << shift;
74         val |= get_bits(&s->gb, shift);
75         val++;
76     }
77     if (sign)
78         val = -val;
79     val += pred;
80
81     /* modulo decoding */
82     return sign_extend(val, 5 + shift);
83 }
84
85 static inline int mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
86 {
87     int level, dc, diff, i, j, run;
88     int component;
89     RLTable *rl = &ff_rl_mpeg1;
90     uint8_t * const scantable    = s->intra_scantable.permutated;
91     const uint16_t *quant_matrix = s->intra_matrix;
92     const int qscale             = s->qscale;
93
94     /* DC coefficient */
95     component = (n <= 3 ? 0 : n - 4 + 1);
96     diff = decode_dc(&s->gb, component);
97     if (diff >= 0xffff)
98         return -1;
99     dc  = s->last_dc[component];
100     dc += diff;
101     s->last_dc[component] = dc;
102     block[0] = dc * quant_matrix[0];
103     av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
104     i = 0;
105     {
106         OPEN_READER(re, &s->gb);
107         /* now quantify & encode AC coefficients */
108         for (;;) {
109             UPDATE_CACHE(re, &s->gb);
110             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
111
112             if (level == 127) {
113                 break;
114             } else if (level != 0) {
115                 i += run;
116                 j = scantable[i];
117                 level = (level * qscale * quant_matrix[j]) >> 4;
118                 level = (level - 1) | 1;
119                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
120                 LAST_SKIP_BITS(re, &s->gb, 1);
121             } else {
122                 /* escape */
123                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
124                 UPDATE_CACHE(re, &s->gb);
125                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
126                 if (level == -128) {
127                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
128                 } else if (level == 0) {
129                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
130                 }
131                 i += run;
132                 j = scantable[i];
133                 if (level < 0) {
134                     level = -level;
135                     level = (level * qscale * quant_matrix[j]) >> 4;
136                     level = (level - 1) | 1;
137                     level = -level;
138                 } else {
139                     level = (level * qscale * quant_matrix[j]) >> 4;
140                     level = (level - 1) | 1;
141                 }
142             }
143             if (i > 63) {
144                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
145                 return -1;
146             }
147
148             block[j] = level;
149         }
150         CLOSE_READER(re, &s->gb);
151     }
152     s->block_last_index[n] = i;
153    return 0;
154 }
155
156 int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
157 {
158     return mpeg1_decode_block_intra(s, block, n);
159 }
160
161 static inline int mpeg1_decode_block_inter(MpegEncContext *s, int16_t *block, int n)
162 {
163     int level, i, j, run;
164     RLTable *rl = &ff_rl_mpeg1;
165     uint8_t * const scantable    = s->intra_scantable.permutated;
166     const uint16_t *quant_matrix = s->inter_matrix;
167     const int qscale             = s->qscale;
168
169     {
170         OPEN_READER(re, &s->gb);
171         i = -1;
172         // special case for first coefficient, no need to add second VLC table
173         UPDATE_CACHE(re, &s->gb);
174         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
175             level = (3 * qscale * quant_matrix[0]) >> 5;
176             level = (level - 1) | 1;
177             if (GET_CACHE(re, &s->gb) & 0x40000000)
178                 level = -level;
179             block[0] = level;
180             i++;
181             SKIP_BITS(re, &s->gb, 2);
182             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
183                 goto end;
184         }
185         /* now quantify & encode AC coefficients */
186         for (;;) {
187             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
188
189             if (level != 0) {
190                 i += run;
191                 j = scantable[i];
192                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
193                 level = (level - 1) | 1;
194                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
195                 SKIP_BITS(re, &s->gb, 1);
196             } else {
197                 /* escape */
198                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
199                 UPDATE_CACHE(re, &s->gb);
200                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
201                 if (level == -128) {
202                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
203                 } else if (level == 0) {
204                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
205                 }
206                 i += run;
207                 j = scantable[i];
208                 if (level < 0) {
209                     level = -level;
210                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
211                     level = (level - 1) | 1;
212                     level = -level;
213                 } else {
214                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
215                     level = (level - 1) | 1;
216                 }
217             }
218             if (i > 63) {
219                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
220                 return -1;
221             }
222
223             block[j] = level;
224             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
225                 break;
226             UPDATE_CACHE(re, &s->gb);
227         }
228 end:
229         LAST_SKIP_BITS(re, &s->gb, 2);
230         CLOSE_READER(re, &s->gb);
231     }
232     s->block_last_index[n] = i;
233     return 0;
234 }
235
236 /**
237  * Note: this function can read out of range and crash for corrupt streams.
238  * Changing this would eat up any speed benefits it has.
239  * Do not use "fast" flag if you need the code to be robust.
240  */
241 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, int16_t *block, int n)
242 {
243     int level, i, j, run;
244     RLTable *rl = &ff_rl_mpeg1;
245     uint8_t * const scantable = s->intra_scantable.permutated;
246     const int qscale          = s->qscale;
247
248     {
249         OPEN_READER(re, &s->gb);
250         i = -1;
251         // special case for first coefficient, no need to add second VLC table
252         UPDATE_CACHE(re, &s->gb);
253         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
254             level = (3 * qscale) >> 1;
255             level = (level - 1) | 1;
256             if (GET_CACHE(re, &s->gb) & 0x40000000)
257                 level = -level;
258             block[0] = level;
259             i++;
260             SKIP_BITS(re, &s->gb, 2);
261             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
262                 goto end;
263         }
264
265         /* now quantify & encode AC coefficients */
266         for (;;) {
267             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
268
269             if (level != 0) {
270                 i += run;
271                 j = scantable[i];
272                 level = ((level * 2 + 1) * qscale) >> 1;
273                 level = (level - 1) | 1;
274                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
275                 SKIP_BITS(re, &s->gb, 1);
276             } else {
277                 /* escape */
278                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
279                 UPDATE_CACHE(re, &s->gb);
280                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
281                 if (level == -128) {
282                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
283                 } else if (level == 0) {
284                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
285                 }
286                 i += run;
287                 j = scantable[i];
288                 if (level < 0) {
289                     level = -level;
290                     level = ((level * 2 + 1) * qscale) >> 1;
291                     level = (level - 1) | 1;
292                     level = -level;
293                 } else {
294                     level = ((level * 2 + 1) * qscale) >> 1;
295                     level = (level - 1) | 1;
296                 }
297             }
298
299             block[j] = level;
300             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
301                 break;
302             UPDATE_CACHE(re, &s->gb);
303         }
304 end:
305         LAST_SKIP_BITS(re, &s->gb, 2);
306         CLOSE_READER(re, &s->gb);
307     }
308     s->block_last_index[n] = i;
309     return 0;
310 }
311
312
313 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, int16_t *block, int n)
314 {
315     int level, i, j, run;
316     RLTable *rl = &ff_rl_mpeg1;
317     uint8_t * const scantable = s->intra_scantable.permutated;
318     const uint16_t *quant_matrix;
319     const int qscale = s->qscale;
320     int mismatch;
321
322     mismatch = 1;
323
324     {
325         OPEN_READER(re, &s->gb);
326         i = -1;
327         if (n < 4)
328             quant_matrix = s->inter_matrix;
329         else
330             quant_matrix = s->chroma_inter_matrix;
331
332         // special case for first coefficient, no need to add second VLC table
333         UPDATE_CACHE(re, &s->gb);
334         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
335             level= (3 * qscale * quant_matrix[0]) >> 5;
336             if (GET_CACHE(re, &s->gb) & 0x40000000)
337                 level = -level;
338             block[0]  = level;
339             mismatch ^= level;
340             i++;
341             SKIP_BITS(re, &s->gb, 2);
342             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
343                 goto end;
344         }
345
346         /* now quantify & encode AC coefficients */
347         for (;;) {
348             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
349
350             if (level != 0) {
351                 i += run;
352                 j = scantable[i];
353                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
354                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
355                 SKIP_BITS(re, &s->gb, 1);
356             } else {
357                 /* escape */
358                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
359                 UPDATE_CACHE(re, &s->gb);
360                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
361
362                 i += run;
363                 j = scantable[i];
364                 if (level < 0) {
365                     level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
366                     level = -level;
367                 } else {
368                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
369                 }
370             }
371             if (i > 63) {
372                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
373                 return -1;
374             }
375
376             mismatch ^= level;
377             block[j]  = level;
378             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
379                 break;
380             UPDATE_CACHE(re, &s->gb);
381         }
382 end:
383         LAST_SKIP_BITS(re, &s->gb, 2);
384         CLOSE_READER(re, &s->gb);
385     }
386     block[63] ^= (mismatch & 1);
387
388     s->block_last_index[n] = i;
389     return 0;
390 }
391
392 /**
393  * Note: this function can read out of range and crash for corrupt streams.
394  * Changing this would eat up any speed benefits it has.
395  * Do not use "fast" flag if you need the code to be robust.
396  */
397 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
398                                                     int16_t *block, int n)
399 {
400     int level, i, j, run;
401     RLTable *rl = &ff_rl_mpeg1;
402     uint8_t * const scantable = s->intra_scantable.permutated;
403     const int qscale          = s->qscale;
404     OPEN_READER(re, &s->gb);
405     i = -1;
406
407     // special case for first coefficient, no need to add second VLC table
408     UPDATE_CACHE(re, &s->gb);
409     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
410         level = (3 * qscale) >> 1;
411         if (GET_CACHE(re, &s->gb) & 0x40000000)
412             level = -level;
413         block[0] = level;
414         i++;
415         SKIP_BITS(re, &s->gb, 2);
416         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
417             goto end;
418     }
419
420     /* now quantify & encode AC coefficients */
421     for (;;) {
422         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
423
424         if (level != 0) {
425             i += run;
426             j  = scantable[i];
427             level = ((level * 2 + 1) * qscale) >> 1;
428             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
429             SKIP_BITS(re, &s->gb, 1);
430         } else {
431             /* escape */
432             run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
433             UPDATE_CACHE(re, &s->gb);
434             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
435
436             i += run;
437             j  = scantable[i];
438             if (level < 0) {
439                 level = ((-level * 2 + 1) * qscale) >> 1;
440                 level = -level;
441             } else {
442                 level = ((level * 2 + 1) * qscale) >> 1;
443             }
444         }
445
446         block[j] = level;
447         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
448             break;
449         UPDATE_CACHE(re, &s->gb);
450     }
451 end:
452     LAST_SKIP_BITS(re, &s->gb, 2);
453     CLOSE_READER(re, &s->gb);
454     s->block_last_index[n] = i;
455     return 0;
456 }
457
458
459 static inline int mpeg2_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
460 {
461     int level, dc, diff, i, j, run;
462     int component;
463     RLTable *rl;
464     uint8_t * const scantable = s->intra_scantable.permutated;
465     const uint16_t *quant_matrix;
466     const int qscale = s->qscale;
467     int mismatch;
468
469     /* DC coefficient */
470     if (n < 4) {
471         quant_matrix = s->intra_matrix;
472         component = 0;
473     } else {
474         quant_matrix = s->chroma_intra_matrix;
475         component = (n & 1) + 1;
476     }
477     diff = decode_dc(&s->gb, component);
478     if (diff >= 0xffff)
479         return -1;
480     dc  = s->last_dc[component];
481     dc += diff;
482     s->last_dc[component] = dc;
483     block[0] = dc << (3 - s->intra_dc_precision);
484     av_dlog(s->avctx, "dc=%d\n", block[0]);
485     mismatch = block[0] ^ 1;
486     i = 0;
487     if (s->intra_vlc_format)
488         rl = &ff_rl_mpeg2;
489     else
490         rl = &ff_rl_mpeg1;
491
492     {
493         OPEN_READER(re, &s->gb);
494         /* now quantify & encode AC coefficients */
495         for (;;) {
496             UPDATE_CACHE(re, &s->gb);
497             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
498
499             if (level == 127) {
500                 break;
501             } else if (level != 0) {
502                 i += run;
503                 j  = scantable[i];
504                 level = (level * qscale * quant_matrix[j]) >> 4;
505                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
506                 LAST_SKIP_BITS(re, &s->gb, 1);
507             } else {
508                 /* escape */
509                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
510                 UPDATE_CACHE(re, &s->gb);
511                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
512                 i += run;
513                 j  = scantable[i];
514                 if (level < 0) {
515                     level = (-level * qscale * quant_matrix[j]) >> 4;
516                     level = -level;
517                 } else {
518                     level = (level * qscale * quant_matrix[j]) >> 4;
519                 }
520             }
521             if (i > 63) {
522                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
523                 return -1;
524             }
525
526             mismatch ^= level;
527             block[j]  = level;
528         }
529         CLOSE_READER(re, &s->gb);
530     }
531     block[63] ^= mismatch & 1;
532
533     s->block_last_index[n] = i;
534     return 0;
535 }
536
537 /**
538  * Note: this function can read out of range and crash for corrupt streams.
539  * Changing this would eat up any speed benefits it has.
540  * Do not use "fast" flag if you need the code to be robust.
541  */
542 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
543 {
544     int level, dc, diff, j, run;
545     int component;
546     RLTable *rl;
547     uint8_t * scantable = s->intra_scantable.permutated;
548     const uint16_t *quant_matrix;
549     const int qscale = s->qscale;
550
551     /* DC coefficient */
552     if (n < 4) {
553         quant_matrix = s->intra_matrix;
554         component = 0;
555     } else {
556         quant_matrix = s->chroma_intra_matrix;
557         component = (n & 1) + 1;
558     }
559     diff = decode_dc(&s->gb, component);
560     if (diff >= 0xffff)
561         return -1;
562     dc = s->last_dc[component];
563     dc += diff;
564     s->last_dc[component] = dc;
565     block[0] = dc << (3 - s->intra_dc_precision);
566     if (s->intra_vlc_format)
567         rl = &ff_rl_mpeg2;
568     else
569         rl = &ff_rl_mpeg1;
570
571     {
572         OPEN_READER(re, &s->gb);
573         /* now quantify & encode AC coefficients */
574         for (;;) {
575             UPDATE_CACHE(re, &s->gb);
576             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
577
578             if (level == 127) {
579                 break;
580             } else if (level != 0) {
581                 scantable += run;
582                 j = *scantable;
583                 level = (level * qscale * quant_matrix[j]) >> 4;
584                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
585                 LAST_SKIP_BITS(re, &s->gb, 1);
586             } else {
587                 /* escape */
588                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
589                 UPDATE_CACHE(re, &s->gb);
590                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
591                 scantable += run;
592                 j = *scantable;
593                 if (level < 0) {
594                     level = (-level * qscale * quant_matrix[j]) >> 4;
595                     level = -level;
596                 } else {
597                     level = (level * qscale * quant_matrix[j]) >> 4;
598                 }
599             }
600
601             block[j] = level;
602         }
603         CLOSE_READER(re, &s->gb);
604     }
605
606     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
607     return 0;
608 }
609
610 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
611
612 #define INIT_2D_VLC_RL(rl, static_size)\
613 {\
614     static RL_VLC_ELEM rl_vlc_table[static_size];\
615     INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
616                     &rl.table_vlc[0][1], 4, 2,\
617                     &rl.table_vlc[0][0], 4, 2, static_size);\
618 \
619     rl.rl_vlc[0] = rl_vlc_table;\
620     init_2d_vlc_rl(&rl);\
621 }
622
623 static void init_2d_vlc_rl(RLTable *rl)
624 {
625     int i;
626
627     for (i = 0; i < rl->vlc.table_size; i++) {
628         int code = rl->vlc.table[i][0];
629         int len  = rl->vlc.table[i][1];
630         int level, run;
631
632         if (len == 0) { // illegal code
633             run   = 65;
634             level = MAX_LEVEL;
635         } else if (len<0) { //more bits needed
636             run   = 0;
637             level = code;
638         } else {
639             if (code == rl->n) { //esc
640                 run   = 65;
641                 level = 0;
642             } else if (code == rl->n+1) { //eob
643                 run   = 0;
644                 level = 127;
645             } else {
646                 run   = rl->table_run  [code] + 1;
647                 level = rl->table_level[code];
648             }
649         }
650         rl->rl_vlc[0][i].len   = len;
651         rl->rl_vlc[0][i].level = level;
652         rl->rl_vlc[0][i].run   = run;
653     }
654 }
655
656 void ff_mpeg12_common_init(MpegEncContext *s)
657 {
658
659     s->y_dc_scale_table =
660     s->c_dc_scale_table = ff_mpeg2_dc_scale_table[s->intra_dc_precision];
661
662 }
663
664 void ff_mpeg1_clean_buffers(MpegEncContext *s)
665 {
666     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
667     s->last_dc[1] = s->last_dc[0];
668     s->last_dc[2] = s->last_dc[0];
669     memset(s->last_mv, 0, sizeof(s->last_mv));
670 }
671
672
673 /******************************************/
674 /* decoding */
675
676 VLC ff_dc_lum_vlc;
677 VLC ff_dc_chroma_vlc;
678
679 static VLC mbincr_vlc;
680 static VLC mb_ptype_vlc;
681 static VLC mb_btype_vlc;
682 static VLC mb_pat_vlc;
683
684 av_cold void ff_mpeg12_init_vlcs(void)
685 {
686     static int done = 0;
687
688     if (!done) {
689         done = 1;
690
691         INIT_VLC_STATIC(&ff_dc_lum_vlc, DC_VLC_BITS, 12,
692                         ff_mpeg12_vlc_dc_lum_bits, 1, 1,
693                         ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
694         INIT_VLC_STATIC(&ff_dc_chroma_vlc,  DC_VLC_BITS, 12,
695                         ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
696                         ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
697         INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
698                         &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
699                         &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
700         INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
701                         &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
702                         &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
703         INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
704                         &ff_mpeg12_mbPatTable[0][1], 2, 1,
705                         &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
706
707         INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
708                         &table_mb_ptype[0][1], 2, 1,
709                         &table_mb_ptype[0][0], 2, 1, 64);
710         INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
711                         &table_mb_btype[0][1], 2, 1,
712                         &table_mb_btype[0][0], 2, 1, 64);
713         ff_init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
714         ff_init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
715
716         INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
717         INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
718     }
719 }
720
721 static inline int get_dmv(MpegEncContext *s)
722 {
723     if (get_bits1(&s->gb))
724         return 1 - (get_bits1(&s->gb) << 1);
725     else
726         return 0;
727 }
728
729 static inline int get_qscale(MpegEncContext *s)
730 {
731     int qscale = get_bits(&s->gb, 5);
732     if (s->q_scale_type) {
733         return non_linear_qscale[qscale];
734     } else {
735         return qscale << 1;
736     }
737 }
738
739 static void exchange_uv(MpegEncContext *s)
740 {
741     int16_t (*tmp)[64];
742
743     tmp           = s->pblocks[4];
744     s->pblocks[4] = s->pblocks[5];
745     s->pblocks[5] = tmp;
746 }
747
748 /* motion type (for MPEG-2) */
749 #define MT_FIELD 1
750 #define MT_FRAME 2
751 #define MT_16X8  2
752 #define MT_DMV   3
753
754 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
755 {
756     int i, j, k, cbp, val, mb_type, motion_type;
757     const int mb_block_count = 4 + (1 << s->chroma_format);
758
759     av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
760
761     av_assert2(s->mb_skipped == 0);
762
763     if (s->mb_skip_run-- != 0) {
764         if (s->pict_type == AV_PICTURE_TYPE_P) {
765             s->mb_skipped = 1;
766             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
767         } else {
768             int mb_type;
769
770             if (s->mb_x)
771                 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
772             else
773                 mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1]; // FIXME not sure if this is allowed in MPEG at all
774             if (IS_INTRA(mb_type)) {
775                 av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
776                 return -1;
777             }
778             s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride] =
779                 mb_type | MB_TYPE_SKIP;
780
781 //            assert(s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1] & (MB_TYPE_16x16 | MB_TYPE_16x8));
782
783             if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
784                 s->mb_skipped = 1;
785         }
786
787         return 0;
788     }
789
790     switch (s->pict_type) {
791     default:
792     case AV_PICTURE_TYPE_I:
793         if (get_bits1(&s->gb) == 0) {
794             if (get_bits1(&s->gb) == 0) {
795                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
796                 return -1;
797             }
798             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
799         } else {
800             mb_type = MB_TYPE_INTRA;
801         }
802         break;
803     case AV_PICTURE_TYPE_P:
804         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
805         if (mb_type < 0) {
806             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
807             return -1;
808         }
809         mb_type = ptype2mb_type[mb_type];
810         break;
811     case AV_PICTURE_TYPE_B:
812         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
813         if (mb_type < 0) {
814             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
815             return -1;
816         }
817         mb_type = btype2mb_type[mb_type];
818         break;
819     }
820     av_dlog(s->avctx, "mb_type=%x\n", mb_type);
821 //    motion_type = 0; /* avoid warning */
822     if (IS_INTRA(mb_type)) {
823         s->dsp.clear_blocks(s->block[0]);
824
825         if (!s->chroma_y_shift) {
826             s->dsp.clear_blocks(s->block[6]);
827         }
828
829         /* compute DCT type */
830         if (s->picture_structure == PICT_FRAME && // FIXME add an interlaced_dct coded var?
831             !s->frame_pred_frame_dct) {
832             s->interlaced_dct = get_bits1(&s->gb);
833         }
834
835         if (IS_QUANT(mb_type))
836             s->qscale = get_qscale(s);
837
838         if (s->concealment_motion_vectors) {
839             /* just parse them */
840             if (s->picture_structure != PICT_FRAME)
841                 skip_bits1(&s->gb); /* field select */
842
843             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
844                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
845             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
846                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
847
848             skip_bits1(&s->gb); /* marker */
849         } else
850             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
851         s->mb_intra = 1;
852         // if 1, we memcpy blocks in xvmcvideo
853         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
854             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
855             if (s->swap_uv) {
856                 exchange_uv(s);
857             }
858         }
859
860         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
861             if (s->flags2 & CODEC_FLAG2_FAST) {
862                 for (i = 0; i < 6; i++) {
863                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
864                 }
865             } else {
866                 for (i = 0; i < mb_block_count; i++) {
867                     if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
868                         return -1;
869                 }
870             }
871         } else {
872             for (i = 0; i < 6; i++) {
873                 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
874                     return -1;
875             }
876         }
877     } else {
878         if (mb_type & MB_TYPE_ZERO_MV) {
879             av_assert2(mb_type & MB_TYPE_CBP);
880
881             s->mv_dir = MV_DIR_FORWARD;
882             if (s->picture_structure == PICT_FRAME) {
883                 if (s->picture_structure == PICT_FRAME
884                     && !s->frame_pred_frame_dct)
885                     s->interlaced_dct = get_bits1(&s->gb);
886                 s->mv_type = MV_TYPE_16X16;
887             } else {
888                 s->mv_type = MV_TYPE_FIELD;
889                 mb_type |= MB_TYPE_INTERLACED;
890                 s->field_select[0][0] = s->picture_structure - 1;
891             }
892
893             if (IS_QUANT(mb_type))
894                 s->qscale = get_qscale(s);
895
896             s->last_mv[0][0][0] = 0;
897             s->last_mv[0][0][1] = 0;
898             s->last_mv[0][1][0] = 0;
899             s->last_mv[0][1][1] = 0;
900             s->mv[0][0][0] = 0;
901             s->mv[0][0][1] = 0;
902         } else {
903             av_assert2(mb_type & MB_TYPE_L0L1);
904             // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
905             /* get additional motion vector type */
906             if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct)
907                 motion_type = MT_FRAME;
908             else {
909                 motion_type = get_bits(&s->gb, 2);
910                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
911                     s->interlaced_dct = get_bits1(&s->gb);
912             }
913
914             if (IS_QUANT(mb_type))
915                 s->qscale = get_qscale(s);
916
917             /* motion vectors */
918             s->mv_dir = (mb_type >> 13) & 3;
919             av_dlog(s->avctx, "motion_type=%d\n", motion_type);
920             switch (motion_type) {
921             case MT_FRAME: /* or MT_16X8 */
922                 if (s->picture_structure == PICT_FRAME) {
923                     mb_type |= MB_TYPE_16x16;
924                     s->mv_type = MV_TYPE_16X16;
925                     for (i = 0; i < 2; i++) {
926                         if (USES_LIST(mb_type, i)) {
927                             /* MT_FRAME */
928                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
929                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
930                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
931                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
932                             /* full_pel: only for MPEG-1 */
933                             if (s->full_pel[i]) {
934                                 s->mv[i][0][0] <<= 1;
935                                 s->mv[i][0][1] <<= 1;
936                             }
937                         }
938                     }
939                 } else {
940                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
941                     s->mv_type = MV_TYPE_16X8;
942                     for (i = 0; i < 2; i++) {
943                         if (USES_LIST(mb_type, i)) {
944                             /* MT_16X8 */
945                             for (j = 0; j < 2; j++) {
946                                 s->field_select[i][j] = get_bits1(&s->gb);
947                                 for (k = 0; k < 2; k++) {
948                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
949                                                              s->last_mv[i][j][k]);
950                                     s->last_mv[i][j][k] = val;
951                                     s->mv[i][j][k]      = val;
952                                 }
953                             }
954                         }
955                     }
956                 }
957                 break;
958             case MT_FIELD:
959                 s->mv_type = MV_TYPE_FIELD;
960                 if (s->picture_structure == PICT_FRAME) {
961                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
962                     for (i = 0; i < 2; i++) {
963                         if (USES_LIST(mb_type, i)) {
964                             for (j = 0; j < 2; j++) {
965                                 s->field_select[i][j] = get_bits1(&s->gb);
966                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
967                                                          s->last_mv[i][j][0]);
968                                 s->last_mv[i][j][0] = val;
969                                 s->mv[i][j][0]      = val;
970                                 av_dlog(s->avctx, "fmx=%d\n", val);
971                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
972                                                          s->last_mv[i][j][1] >> 1);
973                                 s->last_mv[i][j][1] = val << 1;
974                                 s->mv[i][j][1]      = val;
975                                 av_dlog(s->avctx, "fmy=%d\n", val);
976                             }
977                         }
978                     }
979                 } else {
980                     av_assert0(!s->progressive_sequence);
981                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
982                     for (i = 0; i < 2; i++) {
983                         if (USES_LIST(mb_type, i)) {
984                             s->field_select[i][0] = get_bits1(&s->gb);
985                             for (k = 0; k < 2; k++) {
986                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
987                                                          s->last_mv[i][0][k]);
988                                 s->last_mv[i][0][k] = val;
989                                 s->last_mv[i][1][k] = val;
990                                 s->mv[i][0][k]      = val;
991                             }
992                         }
993                     }
994                 }
995                 break;
996             case MT_DMV:
997                 if(s->progressive_sequence){
998                     av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
999                     return -1;
1000                 }
1001                 s->mv_type = MV_TYPE_DMV;
1002                 for (i = 0; i < 2; i++) {
1003                     if (USES_LIST(mb_type, i)) {
1004                         int dmx, dmy, mx, my, m;
1005                         const int my_shift = s->picture_structure == PICT_FRAME;
1006
1007                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1008                                                 s->last_mv[i][0][0]);
1009                         s->last_mv[i][0][0] = mx;
1010                         s->last_mv[i][1][0] = mx;
1011                         dmx = get_dmv(s);
1012                         my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1013                                                  s->last_mv[i][0][1] >> my_shift);
1014                         dmy = get_dmv(s);
1015
1016
1017                         s->last_mv[i][0][1] = my << my_shift;
1018                         s->last_mv[i][1][1] = my << my_shift;
1019
1020                         s->mv[i][0][0] = mx;
1021                         s->mv[i][0][1] = my;
1022                         s->mv[i][1][0] = mx; // not used
1023                         s->mv[i][1][1] = my; // not used
1024
1025                         if (s->picture_structure == PICT_FRAME) {
1026                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1027
1028                             // m = 1 + 2 * s->top_field_first;
1029                             m = s->top_field_first ? 1 : 3;
1030
1031                             /* top -> top pred */
1032                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1033                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1034                             m = 4 - m;
1035                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1036                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1037                         } else {
1038                             mb_type |= MB_TYPE_16x16;
1039
1040                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1041                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1042                             if (s->picture_structure == PICT_TOP_FIELD)
1043                                 s->mv[i][2][1]--;
1044                             else
1045                                 s->mv[i][2][1]++;
1046                         }
1047                     }
1048                 }
1049                 break;
1050             default:
1051                 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1052                 return -1;
1053             }
1054         }
1055
1056         s->mb_intra = 0;
1057         if (HAS_CBP(mb_type)) {
1058             s->dsp.clear_blocks(s->block[0]);
1059
1060             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1061             if (mb_block_count > 6) {
1062                  cbp <<= mb_block_count - 6;
1063                  cbp  |= get_bits(&s->gb, mb_block_count - 6);
1064                  s->dsp.clear_blocks(s->block[6]);
1065             }
1066             if (cbp <= 0) {
1067                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
1068                 return -1;
1069             }
1070
1071             //if 1, we memcpy blocks in xvmcvideo
1072             if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
1073                 ff_xvmc_pack_pblocks(s, cbp);
1074                 if (s->swap_uv) {
1075                     exchange_uv(s);
1076                 }
1077             }
1078
1079             if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1080                 if (s->flags2 & CODEC_FLAG2_FAST) {
1081                     for (i = 0; i < 6; i++) {
1082                         if (cbp & 32) {
1083                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1084                         } else {
1085                             s->block_last_index[i] = -1;
1086                         }
1087                         cbp += cbp;
1088                     }
1089                 } else {
1090                     cbp <<= 12-mb_block_count;
1091
1092                     for (i = 0; i < mb_block_count; i++) {
1093                         if (cbp & (1 << 11)) {
1094                             if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
1095                                 return -1;
1096                         } else {
1097                             s->block_last_index[i] = -1;
1098                         }
1099                         cbp += cbp;
1100                     }
1101                 }
1102             } else {
1103                 if (s->flags2 & CODEC_FLAG2_FAST) {
1104                     for (i = 0; i < 6; i++) {
1105                         if (cbp & 32) {
1106                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1107                         } else {
1108                             s->block_last_index[i] = -1;
1109                         }
1110                         cbp += cbp;
1111                     }
1112                 } else {
1113                     for (i = 0; i < 6; i++) {
1114                         if (cbp & 32) {
1115                             if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
1116                                 return -1;
1117                         } else {
1118                             s->block_last_index[i] = -1;
1119                         }
1120                         cbp += cbp;
1121                     }
1122                 }
1123             }
1124         } else {
1125             for (i = 0; i < 12; i++)
1126                 s->block_last_index[i] = -1;
1127         }
1128     }
1129
1130     s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1131
1132     return 0;
1133 }
1134
1135 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1136 {
1137     Mpeg1Context *s = avctx->priv_data;
1138     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1139     int i;
1140
1141     /* we need some permutation to store matrices,
1142      * until MPV_common_init() sets the real permutation. */
1143     for (i = 0; i < 64; i++)
1144        s2->dsp.idct_permutation[i]=i;
1145
1146     ff_MPV_decode_defaults(s2);
1147
1148     s->mpeg_enc_ctx.avctx  = avctx;
1149     s->mpeg_enc_ctx.flags  = avctx->flags;
1150     s->mpeg_enc_ctx.flags2 = avctx->flags2;
1151     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1152     ff_mpeg12_init_vlcs();
1153
1154     s->mpeg_enc_ctx_allocated      = 0;
1155     s->mpeg_enc_ctx.picture_number = 0;
1156     s->repeat_field                = 0;
1157     s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1158     avctx->color_range = AVCOL_RANGE_MPEG;
1159     if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1160         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1161     else
1162         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1163     return 0;
1164 }
1165
1166 static int mpeg_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
1167 {
1168     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1169     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1170     int err;
1171
1172     if (avctx == avctx_from || !ctx_from->mpeg_enc_ctx_allocated || !s1->context_initialized)
1173         return 0;
1174
1175     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1176     if (err) return err;
1177
1178     if (!ctx->mpeg_enc_ctx_allocated)
1179         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1180
1181     if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1182         s->picture_number++;
1183
1184     return 0;
1185 }
1186
1187 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1188                                  const uint8_t *new_perm)
1189 {
1190     uint16_t temp_matrix[64];
1191     int i;
1192
1193     memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1194
1195     for (i = 0; i < 64; i++) {
1196         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1197     }
1198 }
1199
1200 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1201 #if CONFIG_MPEG_XVMC_DECODER
1202     AV_PIX_FMT_XVMC_MPEG2_IDCT,
1203     AV_PIX_FMT_XVMC_MPEG2_MC,
1204 #endif
1205 #if CONFIG_MPEG1_VDPAU_HWACCEL
1206     AV_PIX_FMT_VDPAU_MPEG1,
1207 #endif
1208     AV_PIX_FMT_YUV420P,
1209     AV_PIX_FMT_NONE
1210 };
1211
1212 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1213 #if CONFIG_MPEG_XVMC_DECODER
1214     AV_PIX_FMT_XVMC_MPEG2_IDCT,
1215     AV_PIX_FMT_XVMC_MPEG2_MC,
1216 #endif
1217 #if CONFIG_MPEG2_VDPAU_HWACCEL
1218     AV_PIX_FMT_VDPAU_MPEG2,
1219 #endif
1220 #if CONFIG_MPEG2_DXVA2_HWACCEL
1221     AV_PIX_FMT_DXVA2_VLD,
1222 #endif
1223 #if CONFIG_MPEG2_VAAPI_HWACCEL
1224     AV_PIX_FMT_VAAPI_VLD,
1225 #endif
1226     AV_PIX_FMT_YUV420P,
1227     AV_PIX_FMT_NONE
1228 };
1229
1230 static inline int uses_vdpau(AVCodecContext *avctx) {
1231     return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1232 }
1233
1234 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1235 {
1236     Mpeg1Context *s1 = avctx->priv_data;
1237     MpegEncContext *s = &s1->mpeg_enc_ctx;
1238
1239     if(s->chroma_format < 2) {
1240         enum AVPixelFormat res;
1241         res = avctx->get_format(avctx,
1242                                 avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1243                                 mpeg1_hwaccel_pixfmt_list_420 :
1244                                 mpeg2_hwaccel_pixfmt_list_420);
1245         if (res != AV_PIX_FMT_XVMC_MPEG2_IDCT && res != AV_PIX_FMT_XVMC_MPEG2_MC) {
1246             avctx->xvmc_acceleration = 0;
1247         } else if (!avctx->xvmc_acceleration) {
1248             avctx->xvmc_acceleration = 2;
1249         }
1250         return res;
1251     } else if(s->chroma_format == 2)
1252         return AV_PIX_FMT_YUV422P;
1253     else
1254         return AV_PIX_FMT_YUV444P;
1255 }
1256
1257 /* Call this function when we know all parameters.
1258  * It may be called in different places for MPEG-1 and MPEG-2. */
1259 static int mpeg_decode_postinit(AVCodecContext *avctx)
1260 {
1261     Mpeg1Context *s1 = avctx->priv_data;
1262     MpegEncContext *s = &s1->mpeg_enc_ctx;
1263     uint8_t old_permutation[64];
1264
1265     if ((s1->mpeg_enc_ctx_allocated == 0) ||
1266         avctx->coded_width  != s->width   ||
1267         avctx->coded_height != s->height  ||
1268         s1->save_width           != s->width                ||
1269         s1->save_height          != s->height               ||
1270         s1->save_aspect_info     != s->aspect_ratio_info    ||
1271         s1->save_progressive_seq != s->progressive_sequence ||
1272         0)
1273     {
1274
1275         if (s1->mpeg_enc_ctx_allocated) {
1276             ParseContext pc = s->parse_context;
1277             s->parse_context.buffer = 0;
1278             ff_MPV_common_end(s);
1279             s->parse_context = pc;
1280         }
1281
1282         if ((s->width == 0) || (s->height == 0))
1283             return -2;
1284
1285         avcodec_set_dimensions(avctx, s->width, s->height);
1286         if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1287             avctx->rc_max_rate = s->bit_rate;
1288         } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1289                    (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1290             avctx->bit_rate = s->bit_rate;
1291         }
1292         s1->save_aspect_info     = s->aspect_ratio_info;
1293         s1->save_width           = s->width;
1294         s1->save_height          = s->height;
1295         s1->save_progressive_seq = s->progressive_sequence;
1296
1297         /* low_delay may be forced, in this case we will have B-frames
1298          * that behave like P-frames. */
1299         avctx->has_b_frames = !s->low_delay;
1300
1301         if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1302             //MPEG-1 fps
1303             avctx->time_base.den = ff_mpeg12_frame_rate_tab[s->frame_rate_index].num;
1304             avctx->time_base.num = ff_mpeg12_frame_rate_tab[s->frame_rate_index].den;
1305             //MPEG-1 aspect
1306             avctx->sample_aspect_ratio = av_d2q(1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1307             avctx->ticks_per_frame=1;
1308         } else {//MPEG-2
1309         //MPEG-2 fps
1310             av_reduce(&s->avctx->time_base.den,
1311                       &s->avctx->time_base.num,
1312                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1313                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1314                       1 << 30);
1315             avctx->ticks_per_frame = 2;
1316             //MPEG-2 aspect
1317             if (s->aspect_ratio_info > 1) {
1318                 AVRational dar =
1319                     av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1320                                       (AVRational) {s1->pan_scan.width, s1->pan_scan.height}),
1321                              (AVRational) {s->width, s->height});
1322
1323                 // we ignore the spec here and guess a bit as reality does not match the spec, see for example
1324                 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1325                 // issue1613, 621, 562
1326                 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1327                    (av_cmp_q(dar, (AVRational) {4, 3}) && av_cmp_q(dar, (AVRational) {16, 9}))) {
1328                     s->avctx->sample_aspect_ratio =
1329                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1330                                  (AVRational) {s->width, s->height});
1331                 } else {
1332                     s->avctx->sample_aspect_ratio =
1333                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1334                                  (AVRational) {s1->pan_scan.width, s1->pan_scan.height});
1335 //issue1613 4/3 16/9 -> 16/9
1336 //res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1337 //widescreen-issue562.mpg 4/3 16/9 -> 16/9
1338 //                    s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1339                     av_dlog(avctx, "A %d/%d\n",
1340                             ff_mpeg2_aspect[s->aspect_ratio_info].num, ff_mpeg2_aspect[s->aspect_ratio_info].den);
1341                     av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1342                             s->avctx->sample_aspect_ratio.den);
1343                 }
1344             } else {
1345                 s->avctx->sample_aspect_ratio =
1346                     ff_mpeg2_aspect[s->aspect_ratio_info];
1347             }
1348         } // MPEG-2
1349
1350         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1351         avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1352         // until then pix_fmt may be changed right after codec init
1353         if (avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT ||
1354             avctx->hwaccel || uses_vdpau(avctx))
1355             if (avctx->idct_algo == FF_IDCT_AUTO)
1356                 avctx->idct_algo = FF_IDCT_SIMPLE;
1357
1358         /* Quantization matrices may need reordering
1359          * if DCT permutation is changed. */
1360         memcpy(old_permutation, s->dsp.idct_permutation, 64 * sizeof(uint8_t));
1361
1362         if (ff_MPV_common_init(s) < 0)
1363             return -2;
1364
1365         quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->dsp.idct_permutation);
1366         quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->dsp.idct_permutation);
1367         quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->dsp.idct_permutation);
1368         quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->dsp.idct_permutation);
1369
1370         s1->mpeg_enc_ctx_allocated = 1;
1371     }
1372     return 0;
1373 }
1374
1375 static int mpeg1_decode_picture(AVCodecContext *avctx,
1376                                 const uint8_t *buf, int buf_size)
1377 {
1378     Mpeg1Context *s1 = avctx->priv_data;
1379     MpegEncContext *s = &s1->mpeg_enc_ctx;
1380     int ref, f_code, vbv_delay;
1381
1382     init_get_bits(&s->gb, buf, buf_size*8);
1383
1384     ref = get_bits(&s->gb, 10); /* temporal ref */
1385     s->pict_type = get_bits(&s->gb, 3);
1386     if (s->pict_type == 0 || s->pict_type > 3)
1387         return -1;
1388
1389     vbv_delay = get_bits(&s->gb, 16);
1390     s->vbv_delay = vbv_delay;
1391     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
1392         s->full_pel[0] = get_bits1(&s->gb);
1393         f_code = get_bits(&s->gb, 3);
1394         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1395             return -1;
1396         f_code += !f_code;
1397         s->mpeg_f_code[0][0] = f_code;
1398         s->mpeg_f_code[0][1] = f_code;
1399     }
1400     if (s->pict_type == AV_PICTURE_TYPE_B) {
1401         s->full_pel[1] = get_bits1(&s->gb);
1402         f_code = get_bits(&s->gb, 3);
1403         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1404             return -1;
1405         f_code += !f_code;
1406         s->mpeg_f_code[1][0] = f_code;
1407         s->mpeg_f_code[1][1] = f_code;
1408     }
1409     s->current_picture.f.pict_type = s->pict_type;
1410     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1411
1412     if (avctx->debug & FF_DEBUG_PICT_INFO)
1413         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1414
1415     s->y_dc_scale = 8;
1416     s->c_dc_scale = 8;
1417     return 0;
1418 }
1419
1420 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1421 {
1422     MpegEncContext *s= &s1->mpeg_enc_ctx;
1423     int horiz_size_ext, vert_size_ext;
1424     int bit_rate_ext;
1425
1426     skip_bits(&s->gb, 1); /* profile and level esc*/
1427     s->avctx->profile       = get_bits(&s->gb, 3);
1428     s->avctx->level         = get_bits(&s->gb, 4);
1429     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1430     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1431     horiz_size_ext          = get_bits(&s->gb, 2);
1432     vert_size_ext           = get_bits(&s->gb, 2);
1433     s->width  |= (horiz_size_ext << 12);
1434     s->height |= (vert_size_ext  << 12);
1435     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1436     s->bit_rate += (bit_rate_ext << 18) * 400;
1437     skip_bits1(&s->gb); /* marker */
1438     s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1439
1440     s->low_delay = get_bits1(&s->gb);
1441     if (s->flags & CODEC_FLAG_LOW_DELAY)
1442         s->low_delay = 1;
1443
1444     s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1445     s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1446
1447     av_dlog(s->avctx, "sequence extension\n");
1448     s->codec_id      = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1449
1450     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1451         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1452                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1453
1454 }
1455
1456 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1457 {
1458     MpegEncContext *s = &s1->mpeg_enc_ctx;
1459     int color_description, w, h;
1460
1461     skip_bits(&s->gb, 3); /* video format */
1462     color_description = get_bits1(&s->gb);
1463     if (color_description) {
1464         s->avctx->color_primaries = get_bits(&s->gb, 8);
1465         s->avctx->color_trc       = get_bits(&s->gb, 8);
1466         s->avctx->colorspace      = get_bits(&s->gb, 8);
1467     }
1468     w = get_bits(&s->gb, 14);
1469     skip_bits(&s->gb, 1); //marker
1470     h = get_bits(&s->gb, 14);
1471     // remaining 3 bits are zero padding
1472
1473     s1->pan_scan.width  = 16 * w;
1474     s1->pan_scan.height = 16 * h;
1475
1476     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1477         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1478 }
1479
1480 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1481 {
1482     MpegEncContext *s = &s1->mpeg_enc_ctx;
1483     int i, nofco;
1484
1485     nofco = 1;
1486     if (s->progressive_sequence) {
1487         if (s->repeat_first_field) {
1488             nofco++;
1489             if (s->top_field_first)
1490                 nofco++;
1491         }
1492     } else {
1493         if (s->picture_structure == PICT_FRAME) {
1494             nofco++;
1495             if (s->repeat_first_field)
1496                 nofco++;
1497         }
1498     }
1499     for (i = 0; i < nofco; i++) {
1500         s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1501         skip_bits(&s->gb, 1); // marker
1502         s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1503         skip_bits(&s->gb, 1); // marker
1504     }
1505
1506     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1507         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1508                s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1509                s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1510                s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1511 }
1512
1513 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra)
1514 {
1515     int i;
1516
1517     for (i = 0; i < 64; i++) {
1518         int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1519         int v = get_bits(&s->gb, 8);
1520         if (v == 0) {
1521             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1522             return -1;
1523         }
1524         if (intra && i == 0 && v != 8) {
1525             av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1526             v = 8; // needed by pink.mpg / issue1046
1527         }
1528         matrix0[j] = v;
1529         if (matrix1)
1530             matrix1[j] = v;
1531     }
1532     return 0;
1533 }
1534
1535 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1536 {
1537     av_dlog(s->avctx, "matrix extension\n");
1538
1539     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1540     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1541     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL           , 1);
1542     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL           , 0);
1543 }
1544
1545 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1546 {
1547     MpegEncContext *s = &s1->mpeg_enc_ctx;
1548
1549     s->full_pel[0] = s->full_pel[1] = 0;
1550     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1551     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1552     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1553     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1554     if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1555         av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1556         if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1557             if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1558                 s->pict_type = AV_PICTURE_TYPE_I;
1559             else
1560                 s->pict_type = AV_PICTURE_TYPE_P;
1561         } else
1562             s->pict_type = AV_PICTURE_TYPE_B;
1563         s->current_picture.f.pict_type = s->pict_type;
1564         s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1565     }
1566     s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1567     s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1568     s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1569     s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1570
1571     s->intra_dc_precision         = get_bits(&s->gb, 2);
1572     s->picture_structure          = get_bits(&s->gb, 2);
1573     s->top_field_first            = get_bits1(&s->gb);
1574     s->frame_pred_frame_dct       = get_bits1(&s->gb);
1575     s->concealment_motion_vectors = get_bits1(&s->gb);
1576     s->q_scale_type               = get_bits1(&s->gb);
1577     s->intra_vlc_format           = get_bits1(&s->gb);
1578     s->alternate_scan             = get_bits1(&s->gb);
1579     s->repeat_first_field         = get_bits1(&s->gb);
1580     s->chroma_420_type            = get_bits1(&s->gb);
1581     s->progressive_frame          = get_bits1(&s->gb);
1582
1583
1584     if (s->alternate_scan) {
1585         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1586         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1587     } else {
1588         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1589         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1590     }
1591
1592     /* composite display not parsed */
1593     av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1594     av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1595     av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1596     av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1597     av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1598     av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1599     av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1600     av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1601     av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1602 }
1603
1604 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1605 {
1606     AVCodecContext *avctx = s->avctx;
1607     Mpeg1Context *s1 = (Mpeg1Context*)s;
1608
1609     /* start frame decoding */
1610     if (s->first_field || s->picture_structure == PICT_FRAME) {
1611         AVFrameSideData *pan_scan;
1612
1613         if (ff_MPV_frame_start(s, avctx) < 0)
1614             return -1;
1615
1616         ff_mpeg_er_frame_start(s);
1617
1618         /* first check if we must repeat the frame */
1619         s->current_picture_ptr->f.repeat_pict = 0;
1620         if (s->repeat_first_field) {
1621             if (s->progressive_sequence) {
1622                 if (s->top_field_first)
1623                     s->current_picture_ptr->f.repeat_pict = 4;
1624                 else
1625                     s->current_picture_ptr->f.repeat_pict = 2;
1626             } else if (s->progressive_frame) {
1627                 s->current_picture_ptr->f.repeat_pict = 1;
1628             }
1629         }
1630
1631         pan_scan = av_frame_new_side_data(&s->current_picture_ptr->f,
1632                                           AV_FRAME_DATA_PANSCAN,
1633                                           sizeof(s1->pan_scan));
1634         if (!pan_scan)
1635             return AVERROR(ENOMEM);
1636         memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1637
1638         if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1639             ff_thread_finish_setup(avctx);
1640     } else { // second field
1641         int i;
1642
1643         if (!s->current_picture_ptr) {
1644             av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1645             return -1;
1646         }
1647
1648         if (s->avctx->hwaccel &&
1649             (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1650             if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1651                 av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode first field\n");
1652         }
1653
1654         for (i = 0; i < 4; i++) {
1655             s->current_picture.f.data[i] = s->current_picture_ptr->f.data[i];
1656             if (s->picture_structure == PICT_BOTTOM_FIELD) {
1657                 s->current_picture.f.data[i] += s->current_picture_ptr->f.linesize[i];
1658             }
1659         }
1660     }
1661
1662     if (avctx->hwaccel) {
1663         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1664             return -1;
1665     }
1666
1667 // MPV_frame_start will call this function too,
1668 // but we need to call it on every field
1669     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1670         if (ff_xvmc_field_start(s, avctx) < 0)
1671             return -1;
1672
1673     return 0;
1674 }
1675
1676 #define DECODE_SLICE_ERROR -1
1677 #define DECODE_SLICE_OK     0
1678
1679 /**
1680  * Decode a slice.
1681  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1682  * @return DECODE_SLICE_ERROR if the slice is damaged,
1683  *         DECODE_SLICE_OK if this slice is OK
1684  */
1685 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1686                              const uint8_t **buf, int buf_size)
1687 {
1688     AVCodecContext *avctx = s->avctx;
1689     const int lowres      = s->avctx->lowres;
1690     const int field_pic   = s->picture_structure != PICT_FRAME;
1691
1692     s->resync_mb_x =
1693     s->resync_mb_y = -1;
1694
1695     av_assert0(mb_y < s->mb_height);
1696
1697     init_get_bits(&s->gb, *buf, buf_size * 8);
1698     if(s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1699         skip_bits(&s->gb, 3);
1700
1701     ff_mpeg1_clean_buffers(s);
1702     s->interlaced_dct = 0;
1703
1704     s->qscale = get_qscale(s);
1705
1706     if (s->qscale == 0) {
1707         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1708         return -1;
1709     }
1710
1711     /* extra slice info */
1712     while (get_bits1(&s->gb) != 0) {
1713         skip_bits(&s->gb, 8);
1714     }
1715
1716     s->mb_x = 0;
1717
1718     if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1719         skip_bits1(&s->gb);
1720     } else {
1721         while (get_bits_left(&s->gb) > 0) {
1722             int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1723             if (code < 0) {
1724                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1725                 return -1;
1726             }
1727             if (code >= 33) {
1728                 if (code == 33) {
1729                     s->mb_x += 33;
1730                 }
1731                 /* otherwise, stuffing, nothing to do */
1732             } else {
1733                 s->mb_x += code;
1734                 break;
1735             }
1736         }
1737     }
1738
1739     if (s->mb_x >= (unsigned)s->mb_width) {
1740         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1741         return -1;
1742     }
1743
1744     if (avctx->hwaccel) {
1745         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1746         int start_code = -1;
1747         buf_end = avpriv_mpv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1748         if (buf_end < *buf + buf_size)
1749             buf_end -= 4;
1750         s->mb_y = mb_y;
1751         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1752             return DECODE_SLICE_ERROR;
1753         *buf = buf_end;
1754         return DECODE_SLICE_OK;
1755     }
1756
1757     s->resync_mb_x = s->mb_x;
1758     s->resync_mb_y = s->mb_y = mb_y;
1759     s->mb_skip_run = 0;
1760     ff_init_block_index(s);
1761
1762     if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1763         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1764              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",
1765                     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],
1766                     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")),
1767                     s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1768                     s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1769                     s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1770         }
1771     }
1772
1773     for (;;) {
1774         // If 1, we memcpy blocks in xvmcvideo.
1775         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1776             ff_xvmc_init_block(s); // set s->block
1777
1778         if (mpeg_decode_mb(s, s->block) < 0)
1779             return -1;
1780
1781         if (s->current_picture.motion_val[0] && !s->encoding) { // note motion_val is normally NULL unless we want to extract the MVs
1782             const int wrap = s->b8_stride;
1783             int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1784             int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1785             int motion_x, motion_y, dir, i;
1786
1787             for (i = 0; i < 2; i++) {
1788                 for (dir = 0; dir < 2; dir++) {
1789                     if (s->mb_intra || (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1790                         motion_x = motion_y = 0;
1791                     } else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1792                         motion_x = s->mv[dir][0][0];
1793                         motion_y = s->mv[dir][0][1];
1794                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1795                         motion_x = s->mv[dir][i][0];
1796                         motion_y = s->mv[dir][i][1];
1797                     }
1798
1799                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1800                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1801                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1802                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1803                     s->current_picture.ref_index [dir][b8_xy    ] =
1804                     s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1805                     av_assert2(s->field_select[dir][i] == 0 || s->field_select[dir][i] == 1);
1806                 }
1807                 xy += wrap;
1808                 b8_xy +=2;
1809             }
1810         }
1811
1812         s->dest[0] += 16 >> lowres;
1813         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1814         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1815
1816         ff_MPV_decode_mb(s, s->block);
1817
1818         if (++s->mb_x >= s->mb_width) {
1819             const int mb_size = 16 >> s->avctx->lowres;
1820
1821             ff_mpeg_draw_horiz_band(s, mb_size*(s->mb_y >> field_pic), mb_size);
1822             ff_MPV_report_decode_progress(s);
1823
1824             s->mb_x = 0;
1825             s->mb_y += 1 << field_pic;
1826
1827             if (s->mb_y >= s->mb_height) {
1828                 int left   = get_bits_left(&s->gb);
1829                 int is_d10 = s->chroma_format == 2 && s->pict_type == AV_PICTURE_TYPE_I && avctx->profile == 0 && avctx->level == 5
1830                              && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1831                              && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1832
1833                 if (left >= 32 && !is_d10) {
1834                     GetBitContext gb = s->gb;
1835                     align_get_bits(&gb);
1836                     if (show_bits(&gb, 24) == 0x060E2B) {
1837                         av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1838                         is_d10 = 1;
1839                     }
1840                 }
1841
1842                 if (left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1843                     || ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1844                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1845                     return -1;
1846                 } else
1847                     goto eos;
1848             }
1849
1850             ff_init_block_index(s);
1851         }
1852
1853         /* skip mb handling */
1854         if (s->mb_skip_run == -1) {
1855             /* read increment again */
1856             s->mb_skip_run = 0;
1857             for (;;) {
1858                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1859                 if (code < 0) {
1860                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1861                     return -1;
1862                 }
1863                 if (code >= 33) {
1864                     if (code == 33) {
1865                         s->mb_skip_run += 33;
1866                     } else if (code == 35) {
1867                         if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1868                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1869                             return -1;
1870                         }
1871                         goto eos; /* end of slice */
1872                     }
1873                     /* otherwise, stuffing, nothing to do */
1874                 } else {
1875                     s->mb_skip_run += code;
1876                     break;
1877                 }
1878             }
1879             if (s->mb_skip_run) {
1880                 int i;
1881                 if (s->pict_type == AV_PICTURE_TYPE_I) {
1882                     av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1883                     return -1;
1884                 }
1885
1886                 /* skip mb */
1887                 s->mb_intra = 0;
1888                 for (i = 0; i < 12; i++)
1889                     s->block_last_index[i] = -1;
1890                 if (s->picture_structure == PICT_FRAME)
1891                     s->mv_type = MV_TYPE_16X16;
1892                 else
1893                     s->mv_type = MV_TYPE_FIELD;
1894                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1895                     /* if P type, zero motion vector is implied */
1896                     s->mv_dir             = MV_DIR_FORWARD;
1897                     s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1898                     s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1899                     s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1900                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1901                 } else {
1902                     /* if B type, reuse previous vectors and directions */
1903                     s->mv[0][0][0] = s->last_mv[0][0][0];
1904                     s->mv[0][0][1] = s->last_mv[0][0][1];
1905                     s->mv[1][0][0] = s->last_mv[1][0][0];
1906                     s->mv[1][0][1] = s->last_mv[1][0][1];
1907                 }
1908             }
1909         }
1910     }
1911 eos: // end of slice
1912     *buf += (get_bits_count(&s->gb)-1)/8;
1913     av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1914     return 0;
1915 }
1916
1917 static int slice_decode_thread(AVCodecContext *c, void *arg)
1918 {
1919     MpegEncContext *s   = *(void**)arg;
1920     const uint8_t *buf  = s->gb.buffer;
1921     int mb_y            = s->start_mb_y;
1922     const int field_pic = s->picture_structure != PICT_FRAME;
1923
1924     s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1925
1926     for (;;) {
1927         uint32_t start_code;
1928         int ret;
1929
1930         ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1931         emms_c();
1932         av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1933                 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1934                 s->start_mb_y, s->end_mb_y, s->er.error_count);
1935         if (ret < 0) {
1936             if (c->err_recognition & AV_EF_EXPLODE)
1937                 return ret;
1938             if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1939                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
1940         } else {
1941             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_AC_END | ER_DC_END | ER_MV_END);
1942         }
1943
1944         if (s->mb_y == s->end_mb_y)
1945             return 0;
1946
1947         start_code = -1;
1948         buf = avpriv_mpv_find_start_code(buf, s->gb.buffer_end, &start_code);
1949         mb_y= start_code - SLICE_MIN_START_CODE;
1950         if(s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1951             mb_y += (*buf&0xE0)<<2;
1952         mb_y <<= field_pic;
1953         if (s->picture_structure == PICT_BOTTOM_FIELD)
1954             mb_y++;
1955         if (mb_y < 0 || mb_y >= s->end_mb_y)
1956             return -1;
1957     }
1958 }
1959
1960 /**
1961  * Handle slice ends.
1962  * @return 1 if it seems to be the last slice
1963  */
1964 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1965 {
1966     Mpeg1Context *s1 = avctx->priv_data;
1967     MpegEncContext *s = &s1->mpeg_enc_ctx;
1968
1969     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1970         return 0;
1971
1972     if (s->avctx->hwaccel) {
1973         if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1974             av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1975     }
1976
1977     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1978         ff_xvmc_field_end(s);
1979
1980     /* end of slice reached */
1981     if (/*s->mb_y << field_pic == s->mb_height &&*/ !s->first_field && !s->first_slice) {
1982         /* end of image */
1983
1984         ff_er_frame_end(&s->er);
1985
1986         ff_MPV_frame_end(s);
1987
1988         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
1989             int ret = av_frame_ref(pict, &s->current_picture_ptr->f);
1990             if (ret < 0)
1991                 return ret;
1992             ff_print_debug_info(s, s->current_picture_ptr, pict);
1993         } else {
1994             if (avctx->active_thread_type & FF_THREAD_FRAME)
1995                 s->picture_number++;
1996             /* latency of 1 frame for I- and P-frames */
1997             /* XXX: use another variable than picture_number */
1998             if (s->last_picture_ptr != NULL) {
1999                 int ret = av_frame_ref(pict, &s->last_picture_ptr->f);
2000                 if (ret < 0)
2001                     return ret;
2002                 ff_print_debug_info(s, s->last_picture_ptr, pict);
2003             }
2004         }
2005
2006         return 1;
2007     } else {
2008         return 0;
2009     }
2010 }
2011
2012 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2013                                  const uint8_t *buf, int buf_size)
2014 {
2015     Mpeg1Context *s1 = avctx->priv_data;
2016     MpegEncContext *s = &s1->mpeg_enc_ctx;
2017     int width, height;
2018     int i, v, j;
2019
2020     init_get_bits(&s->gb, buf, buf_size*8);
2021
2022     width  = get_bits(&s->gb, 12);
2023     height = get_bits(&s->gb, 12);
2024     s->aspect_ratio_info = get_bits(&s->gb, 4);
2025     if (s->aspect_ratio_info == 0) {
2026         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2027         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2028             return -1;
2029     }
2030     s->frame_rate_index = get_bits(&s->gb, 4);
2031     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2032         return -1;
2033     s->bit_rate = get_bits(&s->gb, 18) * 400;
2034     if (get_bits1(&s->gb) == 0) /* marker */
2035         return -1;
2036     s->width  = width;
2037     s->height = height;
2038
2039     s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2040     skip_bits(&s->gb, 1);
2041
2042     /* get matrix */
2043     if (get_bits1(&s->gb)) {
2044         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2045     } else {
2046         for (i = 0; i < 64; i++) {
2047             j = s->dsp.idct_permutation[i];
2048             v = ff_mpeg1_default_intra_matrix[i];
2049             s->intra_matrix[j]        = v;
2050             s->chroma_intra_matrix[j] = v;
2051         }
2052     }
2053     if (get_bits1(&s->gb)) {
2054         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2055     } else {
2056         for (i = 0; i < 64; i++) {
2057             int j = s->dsp.idct_permutation[i];
2058             v = ff_mpeg1_default_non_intra_matrix[i];
2059             s->inter_matrix[j]        = v;
2060             s->chroma_inter_matrix[j] = v;
2061         }
2062     }
2063
2064     if (show_bits(&s->gb, 23) != 0) {
2065         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2066         return -1;
2067     }
2068
2069     /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2070     s->progressive_sequence = 1;
2071     s->progressive_frame    = 1;
2072     s->picture_structure    = PICT_FRAME;
2073     s->first_field          = 0;
2074     s->frame_pred_frame_dct = 1;
2075     s->chroma_format        = 1;
2076     s->codec_id             = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2077     s->out_format           = FMT_MPEG1;
2078     s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2079     if (s->flags & CODEC_FLAG_LOW_DELAY)
2080         s->low_delay = 1;
2081
2082     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2083         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2084                s->avctx->rc_buffer_size, s->bit_rate);
2085
2086     return 0;
2087 }
2088
2089 static int vcr2_init_sequence(AVCodecContext *avctx)
2090 {
2091     Mpeg1Context *s1 = avctx->priv_data;
2092     MpegEncContext *s = &s1->mpeg_enc_ctx;
2093     int i, v;
2094
2095     /* start new MPEG-1 context decoding */
2096     s->out_format = FMT_MPEG1;
2097     if (s1->mpeg_enc_ctx_allocated) {
2098         ff_MPV_common_end(s);
2099     }
2100     s->width  = avctx->coded_width;
2101     s->height = avctx->coded_height;
2102     avctx->has_b_frames = 0; // true?
2103     s->low_delay = 1;
2104
2105     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2106     avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2107
2108     if (avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel || uses_vdpau(avctx))
2109         if (avctx->idct_algo == FF_IDCT_AUTO)
2110             avctx->idct_algo = FF_IDCT_SIMPLE;
2111
2112     if (ff_MPV_common_init(s) < 0)
2113         return -1;
2114     s1->mpeg_enc_ctx_allocated = 1;
2115
2116     for (i = 0; i < 64; i++) {
2117         int j = s->dsp.idct_permutation[i];
2118         v = ff_mpeg1_default_intra_matrix[i];
2119         s->intra_matrix[j]        = v;
2120         s->chroma_intra_matrix[j] = v;
2121
2122         v = ff_mpeg1_default_non_intra_matrix[i];
2123         s->inter_matrix[j]        = v;
2124         s->chroma_inter_matrix[j] = v;
2125     }
2126
2127     s->progressive_sequence  = 1;
2128     s->progressive_frame     = 1;
2129     s->picture_structure     = PICT_FRAME;
2130     s->first_field           = 0;
2131     s->frame_pred_frame_dct  = 1;
2132     s->chroma_format         = 1;
2133     if (s->codec_tag == AV_RL32("BW10")) {
2134         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2135     } else {
2136         exchange_uv(s); // common init reset pblocks, so we swap them here
2137         s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2138         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2139     }
2140     s1->save_width           = s->width;
2141     s1->save_height          = s->height;
2142     s1->save_progressive_seq = s->progressive_sequence;
2143     return 0;
2144 }
2145
2146
2147 static void mpeg_decode_user_data(AVCodecContext *avctx,
2148                                   const uint8_t *p, int buf_size)
2149 {
2150     Mpeg1Context *s = avctx->priv_data;
2151     const uint8_t *buf_end = p + buf_size;
2152
2153     if(buf_size > 29){
2154         int i;
2155         for(i=0; i<20; i++)
2156             if(!memcmp(p+i, "\0TMPGEXS\0", 9)){
2157                 s->tmpgexs= 1;
2158             }
2159
2160 /*        for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2161             av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2162         }
2163             av_log(avctx, AV_LOG_ERROR, "\n");*/
2164     }
2165
2166     /* we parse the DTG active format information */
2167     if (buf_end - p >= 5 &&
2168         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2169         int flags = p[4];
2170         p += 5;
2171         if (flags & 0x80) {
2172             /* skip event id */
2173             p += 2;
2174         }
2175         if (flags & 0x40) {
2176             if (buf_end - p < 1)
2177                 return;
2178             avctx->dtg_active_format = p[0] & 0x0f;
2179         }
2180     }
2181 }
2182
2183 static void mpeg_decode_gop(AVCodecContext *avctx,
2184                             const uint8_t *buf, int buf_size)
2185 {
2186     Mpeg1Context *s1  = avctx->priv_data;
2187     MpegEncContext *s = &s1->mpeg_enc_ctx;
2188     int broken_link;
2189     int64_t tc;
2190
2191     init_get_bits(&s->gb, buf, buf_size*8);
2192
2193     tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2194
2195     s->closed_gop = get_bits1(&s->gb);
2196     /*broken_link indicate that after editing the
2197       reference frames of the first B-Frames after GOP I-Frame
2198       are missing (open gop)*/
2199     broken_link = get_bits1(&s->gb);
2200
2201     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2202         char tcbuf[AV_TIMECODE_STR_SIZE];
2203         av_timecode_make_mpeg_tc_string(tcbuf, tc);
2204         av_log(s->avctx, AV_LOG_DEBUG,
2205                "GOP (%s) closed_gop=%d broken_link=%d\n",
2206                tcbuf, s->closed_gop, broken_link);
2207     }
2208 }
2209 /**
2210  * Find the end of the current frame in the bitstream.
2211  * @return the position of the first byte of the next frame, or -1
2212  */
2213 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2214 {
2215     int i;
2216     uint32_t state = pc->state;
2217
2218     /* EOF considered as end of frame */
2219     if (buf_size == 0)
2220         return 0;
2221
2222 /*
2223  0  frame start         -> 1/4
2224  1  first_SEQEXT        -> 0/2
2225  2  first field start   -> 3/0
2226  3  second_SEQEXT       -> 2/0
2227  4  searching end
2228 */
2229
2230     for (i = 0; i < buf_size; i++) {
2231         av_assert1(pc->frame_start_found >= 0 && pc->frame_start_found <= 4);
2232         if (pc->frame_start_found & 1) {
2233             if (state == EXT_START_CODE && (buf[i] & 0xF0) != 0x80)
2234                 pc->frame_start_found--;
2235             else if (state == EXT_START_CODE + 2) {
2236                 if ((buf[i] & 3) == 3)
2237                     pc->frame_start_found = 0;
2238                 else
2239                     pc->frame_start_found = (pc->frame_start_found + 1) & 3;
2240             }
2241             state++;
2242         } else {
2243             i = avpriv_mpv_find_start_code(buf + i, buf + buf_size, &state) - buf - 1;
2244             if (pc->frame_start_found == 0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE) {
2245                 i++;
2246                 pc->frame_start_found = 4;
2247             }
2248             if (state == SEQ_END_CODE) {
2249                 pc->frame_start_found = 0;
2250                 pc->state=-1;
2251                 return i+1;
2252             }
2253             if (pc->frame_start_found == 2 && state == SEQ_START_CODE)
2254                 pc->frame_start_found = 0;
2255             if (pc->frame_start_found  < 4 && state == EXT_START_CODE)
2256                 pc->frame_start_found++;
2257             if (pc->frame_start_found == 4 && (state & 0xFFFFFF00) == 0x100) {
2258                 if (state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE) {
2259                     pc->frame_start_found = 0;
2260                     pc->state             = -1;
2261                     return i - 3;
2262                 }
2263             }
2264             if (pc->frame_start_found == 0 && s && state == PICTURE_START_CODE) {
2265                 ff_fetch_timestamp(s, i - 3, 1);
2266             }
2267         }
2268     }
2269     pc->state = state;
2270     return END_NOT_FOUND;
2271 }
2272
2273 static int decode_chunks(AVCodecContext *avctx,
2274                          AVFrame *picture, int *got_output,
2275                          const uint8_t *buf, int buf_size)
2276 {
2277     Mpeg1Context *s = avctx->priv_data;
2278     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2279     const uint8_t *buf_ptr = buf;
2280     const uint8_t *buf_end = buf + buf_size;
2281     int ret, input_size;
2282     int last_code = 0;
2283     int picture_start_code_seen = 0;
2284
2285     for (;;) {
2286         /* find next start code */
2287         uint32_t start_code = -1;
2288         buf_ptr = avpriv_mpv_find_start_code(buf_ptr, buf_end, &start_code);
2289         if (start_code > 0x1ff) {
2290             if (s2->pict_type != AV_PICTURE_TYPE_B || avctx->skip_frame <= AVDISCARD_DEFAULT) {
2291                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2292                     int i;
2293                     av_assert0(avctx->thread_count > 1);
2294
2295                     avctx->execute(avctx, slice_decode_thread,  &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
2296                     for (i = 0; i < s->slice_count; i++)
2297                         s2->er.error_count += s2->thread_context[i]->er.error_count;
2298                 }
2299
2300                 if (CONFIG_VDPAU && uses_vdpau(avctx))
2301                     ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2302
2303                 ret = slice_end(avctx, picture);
2304                 if (ret < 0)
2305                     return ret;
2306                 else if (ret) {
2307                     if (s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2308                         *got_output = 1;
2309                 }
2310             }
2311             s2->pict_type = 0;
2312             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2313         }
2314
2315         input_size = buf_end - buf_ptr;
2316
2317         if (avctx->debug & FF_DEBUG_STARTCODE) {
2318             av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2319         }
2320
2321         /* prepare data for next start code */
2322         switch (start_code) {
2323         case SEQ_START_CODE:
2324             if (last_code == 0) {
2325                 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2326                 if(buf != avctx->extradata)
2327                     s->sync=1;
2328             } else {
2329                 av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2330                 if (avctx->err_recognition & AV_EF_EXPLODE)
2331                     return AVERROR_INVALIDDATA;
2332             }
2333             break;
2334
2335         case PICTURE_START_CODE:
2336             if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2337                /* If it's a frame picture, there can't be more than one picture header.
2338                   Yet, it does happen and we need to handle it. */
2339                av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2340                break;
2341             }
2342             picture_start_code_seen = 1;
2343
2344             if (s2->width <= 0 || s2->height <= 0) {
2345                 av_log(avctx, AV_LOG_ERROR, "%dx%d is invalid\n", s2->width, s2->height);
2346                 return AVERROR_INVALIDDATA;
2347             }
2348
2349             if(s->tmpgexs){
2350                 s2->intra_dc_precision= 3;
2351                 s2->intra_matrix[0]= 1;
2352             }
2353             if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) && s->slice_count) {
2354                 int i;
2355
2356                 avctx->execute(avctx, slice_decode_thread,
2357                                s2->thread_context, NULL,
2358                                s->slice_count, sizeof(void*));
2359                 for (i = 0; i < s->slice_count; i++)
2360                     s2->er.error_count += s2->thread_context[i]->er.error_count;
2361                 s->slice_count = 0;
2362             }
2363             if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2364                 ret = mpeg_decode_postinit(avctx);
2365                 if (ret < 0) {
2366                     av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
2367                     return ret;
2368                 }
2369
2370                 /* we have a complete image: we try to decompress it */
2371                 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2372                     s2->pict_type = 0;
2373                 s2->first_slice = 1;
2374                 last_code = PICTURE_START_CODE;
2375             } else {
2376                 av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
2377                 if (avctx->err_recognition & AV_EF_EXPLODE)
2378                     return AVERROR_INVALIDDATA;
2379             }
2380             break;
2381         case EXT_START_CODE:
2382             init_get_bits(&s2->gb, buf_ptr, input_size*8);
2383
2384             switch (get_bits(&s2->gb, 4)) {
2385             case 0x1:
2386                 if (last_code == 0) {
2387                 mpeg_decode_sequence_extension(s);
2388                 } else {
2389                     av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
2390                     if (avctx->err_recognition & AV_EF_EXPLODE)
2391                         return AVERROR_INVALIDDATA;
2392                 }
2393                 break;
2394             case 0x2:
2395                 mpeg_decode_sequence_display_extension(s);
2396                 break;
2397             case 0x3:
2398                 mpeg_decode_quant_matrix_extension(s2);
2399                 break;
2400             case 0x7:
2401                 mpeg_decode_picture_display_extension(s);
2402                 break;
2403             case 0x8:
2404                 if (last_code == PICTURE_START_CODE) {
2405                     mpeg_decode_picture_coding_extension(s);
2406                 } else {
2407                     av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
2408                     if (avctx->err_recognition & AV_EF_EXPLODE)
2409                         return AVERROR_INVALIDDATA;
2410                 }
2411                 break;
2412             }
2413             break;
2414         case USER_START_CODE:
2415             mpeg_decode_user_data(avctx, buf_ptr, input_size);
2416             break;
2417         case GOP_START_CODE:
2418             if (last_code == 0) {
2419                 s2->first_field=0;
2420                 mpeg_decode_gop(avctx, buf_ptr, input_size);
2421                 s->sync=1;
2422             } else {
2423                 av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
2424                 if (avctx->err_recognition & AV_EF_EXPLODE)
2425                     return AVERROR_INVALIDDATA;
2426             }
2427             break;
2428         default:
2429             if (start_code >= SLICE_MIN_START_CODE &&
2430                 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2431
2432                 if (s2->progressive_sequence && !s2->progressive_frame) {
2433                     s2->progressive_frame = 1;
2434                     av_log(s2->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
2435                 }
2436
2437                 if (s2->picture_structure == 0 || (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2438                     av_log(s2->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s2->picture_structure);
2439                     s2->picture_structure = PICT_FRAME;
2440                 }
2441
2442                 if (s2->progressive_sequence && !s2->frame_pred_frame_dct) {
2443                     av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2444                 }
2445
2446                 if (s2->picture_structure == PICT_FRAME) {
2447                     s2->first_field = 0;
2448                     s2->v_edge_pos  = 16 * s2->mb_height;
2449                 } else {
2450                     s2->first_field ^= 1;
2451                     s2->v_edge_pos   = 8 * s2->mb_height;
2452                     memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2453                 }
2454             }
2455             if (start_code >= SLICE_MIN_START_CODE &&
2456                 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2457                 const int field_pic = s2->picture_structure != PICT_FRAME;
2458                 int mb_y = start_code - SLICE_MIN_START_CODE;
2459                 last_code = SLICE_MIN_START_CODE;
2460                 if(s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2461                     mb_y += (*buf_ptr&0xE0)<<2;
2462
2463                 mb_y <<= field_pic;
2464                 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2465                     mb_y++;
2466
2467                 if (mb_y >= s2->mb_height) {
2468                     av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2469                     return -1;
2470                 }
2471
2472                 if (s2->last_picture_ptr == NULL) {
2473                 /* Skip B-frames if we do not have reference frames and gop is not closed */
2474                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
2475                         if (!s2->closed_gop)
2476                             break;
2477                     }
2478                 }
2479                 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
2480                     s->sync=1;
2481                 if (s2->next_picture_ptr == NULL) {
2482                 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2483                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) break;
2484                 }
2485                 if ((avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type == AV_PICTURE_TYPE_B) ||
2486                     (avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type != AV_PICTURE_TYPE_I) ||
2487                      avctx->skip_frame >= AVDISCARD_ALL)
2488                     break;
2489
2490                 if (!s->mpeg_enc_ctx_allocated)
2491                     break;
2492
2493                 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2494                     if (mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2495                         break;
2496                 }
2497
2498                 if (!s2->pict_type) {
2499                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2500                     if (avctx->err_recognition & AV_EF_EXPLODE)
2501                         return AVERROR_INVALIDDATA;
2502                     break;
2503                 }
2504
2505                 if (s2->first_slice) {
2506                     s2->first_slice = 0;
2507                     if (mpeg_field_start(s2, buf, buf_size) < 0)
2508                         return -1;
2509                 }
2510                 if (!s2->current_picture_ptr) {
2511                     av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2512                     return AVERROR_INVALIDDATA;
2513                 }
2514
2515                 if (uses_vdpau(avctx)) {
2516                     s->slice_count++;
2517                     break;
2518                 }
2519
2520                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2521                     int threshold = (s2->mb_height * s->slice_count +
2522                                      s2->slice_context_count / 2) /
2523                                     s2->slice_context_count;
2524                     av_assert0(avctx->thread_count > 1);
2525                     if (threshold <= mb_y) {
2526                         MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2527
2528                         thread_context->start_mb_y = mb_y;
2529                         thread_context->end_mb_y   = s2->mb_height;
2530                         if (s->slice_count) {
2531                             s2->thread_context[s->slice_count-1]->end_mb_y = mb_y;
2532                             ret = ff_update_duplicate_context(thread_context,
2533                                                               s2);
2534                             if (ret < 0)
2535                                 return ret;
2536                         }
2537                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2538                         s->slice_count++;
2539                     }
2540                     buf_ptr += 2; // FIXME add minimum number of bytes per slice
2541                 } else {
2542                     ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2543                     emms_c();
2544
2545                     if (ret < 0) {
2546                         if (avctx->err_recognition & AV_EF_EXPLODE)
2547                             return ret;
2548                         if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2549                             ff_er_add_slice(&s2->er, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2550                     } else {
2551                         ff_er_add_slice(&s2->er, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x-1, s2->mb_y, ER_AC_END | ER_DC_END | ER_MV_END);
2552                     }
2553                 }
2554             }
2555             break;
2556         }
2557     }
2558 }
2559
2560 static int mpeg_decode_frame(AVCodecContext *avctx,
2561                              void *data, int *got_output,
2562                              AVPacket *avpkt)
2563 {
2564     const uint8_t *buf = avpkt->data;
2565     int ret;
2566     int buf_size = avpkt->size;
2567     Mpeg1Context *s = avctx->priv_data;
2568     AVFrame *picture = data;
2569     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2570     av_dlog(avctx, "fill_buffer\n");
2571
2572     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2573         /* special case for last picture */
2574         if (s2->low_delay == 0 && s2->next_picture_ptr) {
2575             int ret = av_frame_ref(picture, &s2->next_picture_ptr->f);
2576             if (ret < 0)
2577                 return ret;
2578
2579             s2->next_picture_ptr = NULL;
2580
2581             *got_output = 1;
2582         }
2583         return buf_size;
2584     }
2585
2586     if (s2->flags & CODEC_FLAG_TRUNCATED) {
2587         int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2588
2589         if (ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0)
2590             return buf_size;
2591     }
2592
2593     s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2594     if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2595                                            || s2->codec_tag == AV_RL32("BW10")
2596                                           ))
2597         vcr2_init_sequence(avctx);
2598
2599     s->slice_count = 0;
2600
2601     if (avctx->extradata && !s->extradata_decoded) {
2602         ret = decode_chunks(avctx, picture, got_output, avctx->extradata, avctx->extradata_size);
2603         if(*got_output) {
2604             av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2605             *got_output = 0;
2606         }
2607         s->extradata_decoded = 1;
2608         if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2609             s2->current_picture_ptr = NULL;
2610             return ret;
2611         }
2612     }
2613
2614     ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2615     if (ret<0 || *got_output)
2616         s2->current_picture_ptr = NULL;
2617
2618     return ret;
2619 }
2620
2621
2622 static void flush(AVCodecContext *avctx)
2623 {
2624     Mpeg1Context *s = avctx->priv_data;
2625
2626     s->sync=0;
2627
2628     ff_mpeg_flush(avctx);
2629 }
2630
2631 static int mpeg_decode_end(AVCodecContext *avctx)
2632 {
2633     Mpeg1Context *s = avctx->priv_data;
2634
2635     if (s->mpeg_enc_ctx_allocated)
2636         ff_MPV_common_end(&s->mpeg_enc_ctx);
2637     return 0;
2638 }
2639
2640 static const AVProfile mpeg2_video_profiles[] = {
2641     { FF_PROFILE_MPEG2_422,          "4:2:2"              },
2642     { FF_PROFILE_MPEG2_HIGH,         "High"               },
2643     { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
2644     { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
2645     { FF_PROFILE_MPEG2_MAIN,         "Main"               },
2646     { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
2647     { FF_PROFILE_RESERVED,           "Reserved"           },
2648     { FF_PROFILE_RESERVED,           "Reserved"           },
2649     { FF_PROFILE_UNKNOWN },
2650 };
2651
2652
2653 AVCodec ff_mpeg1video_decoder = {
2654     .name                  = "mpeg1video",
2655     .type                  = AVMEDIA_TYPE_VIDEO,
2656     .id                    = AV_CODEC_ID_MPEG1VIDEO,
2657     .priv_data_size        = sizeof(Mpeg1Context),
2658     .init                  = mpeg_decode_init,
2659     .close                 = mpeg_decode_end,
2660     .decode                = mpeg_decode_frame,
2661     .capabilities          = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2662                              CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2663                              CODEC_CAP_SLICE_THREADS,
2664     .flush                 = flush,
2665     .max_lowres            = 3,
2666     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2667     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2668 };
2669
2670 AVCodec ff_mpeg2video_decoder = {
2671     .name           = "mpeg2video",
2672     .type           = AVMEDIA_TYPE_VIDEO,
2673     .id             = AV_CODEC_ID_MPEG2VIDEO,
2674     .priv_data_size = sizeof(Mpeg1Context),
2675     .init           = mpeg_decode_init,
2676     .close          = mpeg_decode_end,
2677     .decode         = mpeg_decode_frame,
2678     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2679                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2680                       CODEC_CAP_SLICE_THREADS,
2681     .flush          = flush,
2682     .max_lowres     = 3,
2683     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2684     .profiles       = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2685 };
2686
2687 //legacy decoder
2688 AVCodec ff_mpegvideo_decoder = {
2689     .name           = "mpegvideo",
2690     .type           = AVMEDIA_TYPE_VIDEO,
2691     .id             = AV_CODEC_ID_MPEG2VIDEO,
2692     .priv_data_size = sizeof(Mpeg1Context),
2693     .init           = mpeg_decode_init,
2694     .close          = mpeg_decode_end,
2695     .decode         = mpeg_decode_frame,
2696     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2697     .flush          = flush,
2698     .max_lowres     = 3,
2699     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2700 };
2701
2702 #if CONFIG_MPEG_XVMC_DECODER
2703 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2704 {
2705     if (avctx->active_thread_type & FF_THREAD_SLICE)
2706         return -1;
2707     if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2708         return -1;
2709     if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2710         av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2711     }
2712     mpeg_decode_init(avctx);
2713
2714     avctx->pix_fmt           = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2715     avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2716
2717     return 0;
2718 }
2719
2720 AVCodec ff_mpeg_xvmc_decoder = {
2721     .name           = "mpegvideo_xvmc",
2722     .type           = AVMEDIA_TYPE_VIDEO,
2723     .id             = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2724     .priv_data_size = sizeof(Mpeg1Context),
2725     .init           = mpeg_mc_decode_init,
2726     .close          = mpeg_decode_end,
2727     .decode         = mpeg_decode_frame,
2728     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2729                       CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2730     .flush          = flush,
2731     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2732 };
2733
2734 #endif
2735
2736 #if CONFIG_MPEG_VDPAU_DECODER
2737 AVCodec ff_mpeg_vdpau_decoder = {
2738     .name           = "mpegvideo_vdpau",
2739     .type           = AVMEDIA_TYPE_VIDEO,
2740     .id             = AV_CODEC_ID_MPEG2VIDEO,
2741     .priv_data_size = sizeof(Mpeg1Context),
2742     .init           = mpeg_decode_init,
2743     .close          = mpeg_decode_end,
2744     .decode         = mpeg_decode_frame,
2745     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2746                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2747     .flush          = flush,
2748     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2749 };
2750 #endif
2751
2752 #if CONFIG_MPEG1_VDPAU_DECODER
2753 AVCodec ff_mpeg1_vdpau_decoder = {
2754     .name           = "mpeg1video_vdpau",
2755     .type           = AVMEDIA_TYPE_VIDEO,
2756     .id             = AV_CODEC_ID_MPEG1VIDEO,
2757     .priv_data_size = sizeof(Mpeg1Context),
2758     .init           = mpeg_decode_init,
2759     .close          = mpeg_decode_end,
2760     .decode         = mpeg_decode_frame,
2761     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2762                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2763     .flush          = flush,
2764     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2765 };
2766 #endif