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1 /*
2  * MPEG-1/2 decoder
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  * Copyright (c) 2002-2013 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22
23 /**
24  * @file
25  * MPEG-1/2 decoder
26  */
27
28 #include "libavutil/attributes.h"
29 #include "libavutil/internal.h"
30 #include "internal.h"
31 #include "avcodec.h"
32 #include "dsputil.h"
33 #include "mpegvideo.h"
34 #include "error_resilience.h"
35 #include "mpeg12.h"
36 #include "mpeg12data.h"
37 #include "bytestream.h"
38 #include "vdpau_internal.h"
39 #include "xvmc_internal.h"
40 #include "thread.h"
41 #include "version.h"
42
43 typedef struct Mpeg1Context {
44     MpegEncContext mpeg_enc_ctx;
45     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
46     int repeat_field; /* true if we must repeat the field */
47     AVPanScan pan_scan;              /**< some temporary storage for the panscan */
48     uint8_t *a53_caption;
49     int a53_caption_size;
50     int slice_count;
51     int save_aspect_info;
52     int save_width, save_height, save_progressive_seq;
53     AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
54     int sync;                        ///< Did we reach a sync point like a GOP/SEQ/KEYFrame?
55     int tmpgexs;
56     int first_slice;
57     int extradata_decoded;
58 } Mpeg1Context;
59
60 #define MB_TYPE_ZERO_MV   0x20000000
61
62 static const uint32_t ptype2mb_type[7] = {
63                     MB_TYPE_INTRA,
64                     MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
65                     MB_TYPE_L0,
66                     MB_TYPE_L0 | MB_TYPE_CBP,
67     MB_TYPE_QUANT | MB_TYPE_INTRA,
68     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
69     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
70 };
71
72 static const uint32_t btype2mb_type[11] = {
73                     MB_TYPE_INTRA,
74                     MB_TYPE_L1,
75                     MB_TYPE_L1   | MB_TYPE_CBP,
76                     MB_TYPE_L0,
77                     MB_TYPE_L0   | MB_TYPE_CBP,
78                     MB_TYPE_L0L1,
79                     MB_TYPE_L0L1 | MB_TYPE_CBP,
80     MB_TYPE_QUANT | MB_TYPE_INTRA,
81     MB_TYPE_QUANT | MB_TYPE_L1   | MB_TYPE_CBP,
82     MB_TYPE_QUANT | MB_TYPE_L0   | MB_TYPE_CBP,
83     MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
84 };
85
86 static const uint8_t non_linear_qscale[32] = {
87     0, 1, 2, 3, 4, 5, 6, 7,
88     8,10,12,14,16,18,20,22,
89     24,28,32,36,40,44,48,52,
90     56,64,72,80,88,96,104,112,
91 };
92
93 /* as H.263, but only 17 codes */
94 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
95 {
96     int code, sign, val, shift;
97
98     code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
99     if (code == 0) {
100         return pred;
101     }
102     if (code < 0) {
103         return 0xffff;
104     }
105
106     sign  = get_bits1(&s->gb);
107     shift = fcode - 1;
108     val   = code;
109     if (shift) {
110         val  = (val - 1) << shift;
111         val |= get_bits(&s->gb, shift);
112         val++;
113     }
114     if (sign)
115         val = -val;
116     val += pred;
117
118     /* modulo decoding */
119     return sign_extend(val, 5 + shift);
120 }
121
122 static inline int mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
123 {
124     int level, dc, diff, i, j, run;
125     int component;
126     RLTable *rl = &ff_rl_mpeg1;
127     uint8_t * const scantable    = s->intra_scantable.permutated;
128     const uint16_t *quant_matrix = s->intra_matrix;
129     const int qscale             = s->qscale;
130
131     /* DC coefficient */
132     component = (n <= 3 ? 0 : n - 4 + 1);
133     diff = decode_dc(&s->gb, component);
134     if (diff >= 0xffff)
135         return -1;
136     dc  = s->last_dc[component];
137     dc += diff;
138     s->last_dc[component] = dc;
139     block[0] = dc * quant_matrix[0];
140     av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
141     i = 0;
142     {
143         OPEN_READER(re, &s->gb);
144         /* now quantify & encode AC coefficients */
145         for (;;) {
146             UPDATE_CACHE(re, &s->gb);
147             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
148
149             if (level == 127) {
150                 break;
151             } else if (level != 0) {
152                 i += run;
153                 j = scantable[i];
154                 level = (level * qscale * quant_matrix[j]) >> 4;
155                 level = (level - 1) | 1;
156                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
157                 LAST_SKIP_BITS(re, &s->gb, 1);
158             } else {
159                 /* escape */
160                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
161                 UPDATE_CACHE(re, &s->gb);
162                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
163                 if (level == -128) {
164                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
165                 } else if (level == 0) {
166                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
167                 }
168                 i += run;
169                 j = scantable[i];
170                 if (level < 0) {
171                     level = -level;
172                     level = (level * qscale * quant_matrix[j]) >> 4;
173                     level = (level - 1) | 1;
174                     level = -level;
175                 } else {
176                     level = (level * qscale * quant_matrix[j]) >> 4;
177                     level = (level - 1) | 1;
178                 }
179             }
180             if (i > 63) {
181                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
182                 return -1;
183             }
184
185             block[j] = level;
186         }
187         CLOSE_READER(re, &s->gb);
188     }
189     s->block_last_index[n] = i;
190    return 0;
191 }
192
193 int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
194 {
195     return mpeg1_decode_block_intra(s, block, n);
196 }
197
198 static inline int mpeg1_decode_block_inter(MpegEncContext *s, int16_t *block, int n)
199 {
200     int level, i, j, run;
201     RLTable *rl = &ff_rl_mpeg1;
202     uint8_t * const scantable    = s->intra_scantable.permutated;
203     const uint16_t *quant_matrix = s->inter_matrix;
204     const int qscale             = s->qscale;
205
206     {
207         OPEN_READER(re, &s->gb);
208         i = -1;
209         // special case for first coefficient, no need to add second VLC table
210         UPDATE_CACHE(re, &s->gb);
211         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
212             level = (3 * qscale * quant_matrix[0]) >> 5;
213             level = (level - 1) | 1;
214             if (GET_CACHE(re, &s->gb) & 0x40000000)
215                 level = -level;
216             block[0] = level;
217             i++;
218             SKIP_BITS(re, &s->gb, 2);
219             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
220                 goto end;
221         }
222         /* now quantify & encode AC coefficients */
223         for (;;) {
224             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
225
226             if (level != 0) {
227                 i += run;
228                 j = scantable[i];
229                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
230                 level = (level - 1) | 1;
231                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
232                 SKIP_BITS(re, &s->gb, 1);
233             } else {
234                 /* escape */
235                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
236                 UPDATE_CACHE(re, &s->gb);
237                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
238                 if (level == -128) {
239                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
240                 } else if (level == 0) {
241                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
242                 }
243                 i += run;
244                 j = scantable[i];
245                 if (level < 0) {
246                     level = -level;
247                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
248                     level = (level - 1) | 1;
249                     level = -level;
250                 } else {
251                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
252                     level = (level - 1) | 1;
253                 }
254             }
255             if (i > 63) {
256                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
257                 return -1;
258             }
259
260             block[j] = level;
261             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
262                 break;
263             UPDATE_CACHE(re, &s->gb);
264         }
265 end:
266         LAST_SKIP_BITS(re, &s->gb, 2);
267         CLOSE_READER(re, &s->gb);
268     }
269     s->block_last_index[n] = i;
270     return 0;
271 }
272
273 /**
274  * Note: this function can read out of range and crash for corrupt streams.
275  * Changing this would eat up any speed benefits it has.
276  * Do not use "fast" flag if you need the code to be robust.
277  */
278 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, int16_t *block, int n)
279 {
280     int level, i, j, run;
281     RLTable *rl = &ff_rl_mpeg1;
282     uint8_t * const scantable = s->intra_scantable.permutated;
283     const int qscale          = s->qscale;
284
285     {
286         OPEN_READER(re, &s->gb);
287         i = -1;
288         // special case for first coefficient, no need to add second VLC table
289         UPDATE_CACHE(re, &s->gb);
290         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
291             level = (3 * qscale) >> 1;
292             level = (level - 1) | 1;
293             if (GET_CACHE(re, &s->gb) & 0x40000000)
294                 level = -level;
295             block[0] = level;
296             i++;
297             SKIP_BITS(re, &s->gb, 2);
298             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
299                 goto end;
300         }
301
302         /* now quantify & encode AC coefficients */
303         for (;;) {
304             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
305
306             if (level != 0) {
307                 i += run;
308                 j = scantable[i];
309                 level = ((level * 2 + 1) * qscale) >> 1;
310                 level = (level - 1) | 1;
311                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
312                 SKIP_BITS(re, &s->gb, 1);
313             } else {
314                 /* escape */
315                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
316                 UPDATE_CACHE(re, &s->gb);
317                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
318                 if (level == -128) {
319                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
320                 } else if (level == 0) {
321                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
322                 }
323                 i += run;
324                 j = scantable[i];
325                 if (level < 0) {
326                     level = -level;
327                     level = ((level * 2 + 1) * qscale) >> 1;
328                     level = (level - 1) | 1;
329                     level = -level;
330                 } else {
331                     level = ((level * 2 + 1) * qscale) >> 1;
332                     level = (level - 1) | 1;
333                 }
334             }
335
336             block[j] = level;
337             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
338                 break;
339             UPDATE_CACHE(re, &s->gb);
340         }
341 end:
342         LAST_SKIP_BITS(re, &s->gb, 2);
343         CLOSE_READER(re, &s->gb);
344     }
345     s->block_last_index[n] = i;
346     return 0;
347 }
348
349
350 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, int16_t *block, int n)
351 {
352     int level, i, j, run;
353     RLTable *rl = &ff_rl_mpeg1;
354     uint8_t * const scantable = s->intra_scantable.permutated;
355     const uint16_t *quant_matrix;
356     const int qscale = s->qscale;
357     int mismatch;
358
359     mismatch = 1;
360
361     {
362         OPEN_READER(re, &s->gb);
363         i = -1;
364         if (n < 4)
365             quant_matrix = s->inter_matrix;
366         else
367             quant_matrix = s->chroma_inter_matrix;
368
369         // special case for first coefficient, no need to add second VLC table
370         UPDATE_CACHE(re, &s->gb);
371         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
372             level= (3 * qscale * quant_matrix[0]) >> 5;
373             if (GET_CACHE(re, &s->gb) & 0x40000000)
374                 level = -level;
375             block[0]  = level;
376             mismatch ^= level;
377             i++;
378             SKIP_BITS(re, &s->gb, 2);
379             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
380                 goto end;
381         }
382
383         /* now quantify & encode AC coefficients */
384         for (;;) {
385             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
386
387             if (level != 0) {
388                 i += run;
389                 j = scantable[i];
390                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
391                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
392                 SKIP_BITS(re, &s->gb, 1);
393             } else {
394                 /* escape */
395                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
396                 UPDATE_CACHE(re, &s->gb);
397                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
398
399                 i += run;
400                 j = scantable[i];
401                 if (level < 0) {
402                     level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
403                     level = -level;
404                 } else {
405                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
406                 }
407             }
408             if (i > 63) {
409                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
410                 return -1;
411             }
412
413             mismatch ^= level;
414             block[j]  = level;
415             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
416                 break;
417             UPDATE_CACHE(re, &s->gb);
418         }
419 end:
420         LAST_SKIP_BITS(re, &s->gb, 2);
421         CLOSE_READER(re, &s->gb);
422     }
423     block[63] ^= (mismatch & 1);
424
425     s->block_last_index[n] = i;
426     return 0;
427 }
428
429 /**
430  * Note: this function can read out of range and crash for corrupt streams.
431  * Changing this would eat up any speed benefits it has.
432  * Do not use "fast" flag if you need the code to be robust.
433  */
434 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
435                                                     int16_t *block, int n)
436 {
437     int level, i, j, run;
438     RLTable *rl = &ff_rl_mpeg1;
439     uint8_t * const scantable = s->intra_scantable.permutated;
440     const int qscale          = s->qscale;
441     OPEN_READER(re, &s->gb);
442     i = -1;
443
444     // special case for first coefficient, no need to add second VLC table
445     UPDATE_CACHE(re, &s->gb);
446     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
447         level = (3 * qscale) >> 1;
448         if (GET_CACHE(re, &s->gb) & 0x40000000)
449             level = -level;
450         block[0] = level;
451         i++;
452         SKIP_BITS(re, &s->gb, 2);
453         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
454             goto end;
455     }
456
457     /* now quantify & encode AC coefficients */
458     for (;;) {
459         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
460
461         if (level != 0) {
462             i += run;
463             j  = scantable[i];
464             level = ((level * 2 + 1) * qscale) >> 1;
465             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
466             SKIP_BITS(re, &s->gb, 1);
467         } else {
468             /* escape */
469             run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
470             UPDATE_CACHE(re, &s->gb);
471             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
472
473             i += run;
474             j  = scantable[i];
475             if (level < 0) {
476                 level = ((-level * 2 + 1) * qscale) >> 1;
477                 level = -level;
478             } else {
479                 level = ((level * 2 + 1) * qscale) >> 1;
480             }
481         }
482
483         block[j] = level;
484         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
485             break;
486         UPDATE_CACHE(re, &s->gb);
487     }
488 end:
489     LAST_SKIP_BITS(re, &s->gb, 2);
490     CLOSE_READER(re, &s->gb);
491     s->block_last_index[n] = i;
492     return 0;
493 }
494
495
496 static inline int mpeg2_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
497 {
498     int level, dc, diff, i, j, run;
499     int component;
500     RLTable *rl;
501     uint8_t * const scantable = s->intra_scantable.permutated;
502     const uint16_t *quant_matrix;
503     const int qscale = s->qscale;
504     int mismatch;
505
506     /* DC coefficient */
507     if (n < 4) {
508         quant_matrix = s->intra_matrix;
509         component = 0;
510     } else {
511         quant_matrix = s->chroma_intra_matrix;
512         component = (n & 1) + 1;
513     }
514     diff = decode_dc(&s->gb, component);
515     if (diff >= 0xffff)
516         return -1;
517     dc  = s->last_dc[component];
518     dc += diff;
519     s->last_dc[component] = dc;
520     block[0] = dc << (3 - s->intra_dc_precision);
521     av_dlog(s->avctx, "dc=%d\n", block[0]);
522     mismatch = block[0] ^ 1;
523     i = 0;
524     if (s->intra_vlc_format)
525         rl = &ff_rl_mpeg2;
526     else
527         rl = &ff_rl_mpeg1;
528
529     {
530         OPEN_READER(re, &s->gb);
531         /* now quantify & encode AC coefficients */
532         for (;;) {
533             UPDATE_CACHE(re, &s->gb);
534             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
535
536             if (level == 127) {
537                 break;
538             } else if (level != 0) {
539                 i += run;
540                 j  = scantable[i];
541                 level = (level * qscale * quant_matrix[j]) >> 4;
542                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
543                 LAST_SKIP_BITS(re, &s->gb, 1);
544             } else {
545                 /* escape */
546                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
547                 UPDATE_CACHE(re, &s->gb);
548                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
549                 i += run;
550                 j  = scantable[i];
551                 if (level < 0) {
552                     level = (-level * qscale * quant_matrix[j]) >> 4;
553                     level = -level;
554                 } else {
555                     level = (level * qscale * quant_matrix[j]) >> 4;
556                 }
557             }
558             if (i > 63) {
559                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
560                 return -1;
561             }
562
563             mismatch ^= level;
564             block[j]  = level;
565         }
566         CLOSE_READER(re, &s->gb);
567     }
568     block[63] ^= mismatch & 1;
569
570     s->block_last_index[n] = i;
571     return 0;
572 }
573
574 /**
575  * Note: this function can read out of range and crash for corrupt streams.
576  * Changing this would eat up any speed benefits it has.
577  * Do not use "fast" flag if you need the code to be robust.
578  */
579 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
580 {
581     int level, dc, diff, j, run;
582     int component;
583     RLTable *rl;
584     uint8_t * scantable = s->intra_scantable.permutated;
585     const uint16_t *quant_matrix;
586     const int qscale = s->qscale;
587
588     /* DC coefficient */
589     if (n < 4) {
590         quant_matrix = s->intra_matrix;
591         component = 0;
592     } else {
593         quant_matrix = s->chroma_intra_matrix;
594         component = (n & 1) + 1;
595     }
596     diff = decode_dc(&s->gb, component);
597     if (diff >= 0xffff)
598         return -1;
599     dc = s->last_dc[component];
600     dc += diff;
601     s->last_dc[component] = dc;
602     block[0] = dc << (3 - s->intra_dc_precision);
603     if (s->intra_vlc_format)
604         rl = &ff_rl_mpeg2;
605     else
606         rl = &ff_rl_mpeg1;
607
608     {
609         OPEN_READER(re, &s->gb);
610         /* now quantify & encode AC coefficients */
611         for (;;) {
612             UPDATE_CACHE(re, &s->gb);
613             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
614
615             if (level == 127) {
616                 break;
617             } else if (level != 0) {
618                 scantable += run;
619                 j = *scantable;
620                 level = (level * qscale * quant_matrix[j]) >> 4;
621                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
622                 LAST_SKIP_BITS(re, &s->gb, 1);
623             } else {
624                 /* escape */
625                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
626                 UPDATE_CACHE(re, &s->gb);
627                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
628                 scantable += run;
629                 j = *scantable;
630                 if (level < 0) {
631                     level = (-level * qscale * quant_matrix[j]) >> 4;
632                     level = -level;
633                 } else {
634                     level = (level * qscale * quant_matrix[j]) >> 4;
635                 }
636             }
637
638             block[j] = level;
639         }
640         CLOSE_READER(re, &s->gb);
641     }
642
643     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
644     return 0;
645 }
646
647 /******************************************/
648 /* decoding */
649
650 static inline int get_dmv(MpegEncContext *s)
651 {
652     if (get_bits1(&s->gb))
653         return 1 - (get_bits1(&s->gb) << 1);
654     else
655         return 0;
656 }
657
658 static inline int get_qscale(MpegEncContext *s)
659 {
660     int qscale = get_bits(&s->gb, 5);
661     if (s->q_scale_type) {
662         return non_linear_qscale[qscale];
663     } else {
664         return qscale << 1;
665     }
666 }
667
668 static void exchange_uv(MpegEncContext *s)
669 {
670     int16_t (*tmp)[64];
671
672     tmp           = s->pblocks[4];
673     s->pblocks[4] = s->pblocks[5];
674     s->pblocks[5] = tmp;
675 }
676
677 /* motion type (for MPEG-2) */
678 #define MT_FIELD 1
679 #define MT_FRAME 2
680 #define MT_16X8  2
681 #define MT_DMV   3
682
683 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
684 {
685     int i, j, k, cbp, val, mb_type, motion_type;
686     const int mb_block_count = 4 + (1 << s->chroma_format);
687
688     av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
689
690     av_assert2(s->mb_skipped == 0);
691
692     if (s->mb_skip_run-- != 0) {
693         if (s->pict_type == AV_PICTURE_TYPE_P) {
694             s->mb_skipped = 1;
695             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
696         } else {
697             int mb_type;
698
699             if (s->mb_x)
700                 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
701             else
702                 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
703             if (IS_INTRA(mb_type)) {
704                 av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
705                 return -1;
706             }
707             s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride] =
708                 mb_type | MB_TYPE_SKIP;
709
710             if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
711                 s->mb_skipped = 1;
712         }
713
714         return 0;
715     }
716
717     switch (s->pict_type) {
718     default:
719     case AV_PICTURE_TYPE_I:
720         if (get_bits1(&s->gb) == 0) {
721             if (get_bits1(&s->gb) == 0) {
722                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
723                 return -1;
724             }
725             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
726         } else {
727             mb_type = MB_TYPE_INTRA;
728         }
729         break;
730     case AV_PICTURE_TYPE_P:
731         mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
732         if (mb_type < 0) {
733             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
734             return -1;
735         }
736         mb_type = ptype2mb_type[mb_type];
737         break;
738     case AV_PICTURE_TYPE_B:
739         mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
740         if (mb_type < 0) {
741             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
742             return -1;
743         }
744         mb_type = btype2mb_type[mb_type];
745         break;
746     }
747     av_dlog(s->avctx, "mb_type=%x\n", mb_type);
748 //    motion_type = 0; /* avoid warning */
749     if (IS_INTRA(mb_type)) {
750         s->dsp.clear_blocks(s->block[0]);
751
752         if (!s->chroma_y_shift) {
753             s->dsp.clear_blocks(s->block[6]);
754         }
755
756         /* compute DCT type */
757         if (s->picture_structure == PICT_FRAME && // FIXME add an interlaced_dct coded var?
758             !s->frame_pred_frame_dct) {
759             s->interlaced_dct = get_bits1(&s->gb);
760         }
761
762         if (IS_QUANT(mb_type))
763             s->qscale = get_qscale(s);
764
765         if (s->concealment_motion_vectors) {
766             /* just parse them */
767             if (s->picture_structure != PICT_FRAME)
768                 skip_bits1(&s->gb); /* field select */
769
770             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
771                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
772             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
773                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
774
775             skip_bits1(&s->gb); /* marker */
776         } else
777             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
778         s->mb_intra = 1;
779 #if FF_API_XVMC
780 FF_DISABLE_DEPRECATION_WARNINGS
781         // if 1, we memcpy blocks in xvmcvideo
782         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
783             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
784             if (s->swap_uv) {
785                 exchange_uv(s);
786             }
787         }
788 FF_ENABLE_DEPRECATION_WARNINGS
789 #endif /* FF_API_XVMC */
790
791         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
792             if (s->flags2 & CODEC_FLAG2_FAST) {
793                 for (i = 0; i < 6; i++) {
794                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
795                 }
796             } else {
797                 for (i = 0; i < mb_block_count; i++) {
798                     if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
799                         return -1;
800                 }
801             }
802         } else {
803             for (i = 0; i < 6; i++) {
804                 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
805                     return -1;
806             }
807         }
808     } else {
809         if (mb_type & MB_TYPE_ZERO_MV) {
810             av_assert2(mb_type & MB_TYPE_CBP);
811
812             s->mv_dir = MV_DIR_FORWARD;
813             if (s->picture_structure == PICT_FRAME) {
814                 if (s->picture_structure == PICT_FRAME
815                     && !s->frame_pred_frame_dct)
816                     s->interlaced_dct = get_bits1(&s->gb);
817                 s->mv_type = MV_TYPE_16X16;
818             } else {
819                 s->mv_type = MV_TYPE_FIELD;
820                 mb_type |= MB_TYPE_INTERLACED;
821                 s->field_select[0][0] = s->picture_structure - 1;
822             }
823
824             if (IS_QUANT(mb_type))
825                 s->qscale = get_qscale(s);
826
827             s->last_mv[0][0][0] = 0;
828             s->last_mv[0][0][1] = 0;
829             s->last_mv[0][1][0] = 0;
830             s->last_mv[0][1][1] = 0;
831             s->mv[0][0][0] = 0;
832             s->mv[0][0][1] = 0;
833         } else {
834             av_assert2(mb_type & MB_TYPE_L0L1);
835             // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
836             /* get additional motion vector type */
837             if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct)
838                 motion_type = MT_FRAME;
839             else {
840                 motion_type = get_bits(&s->gb, 2);
841                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
842                     s->interlaced_dct = get_bits1(&s->gb);
843             }
844
845             if (IS_QUANT(mb_type))
846                 s->qscale = get_qscale(s);
847
848             /* motion vectors */
849             s->mv_dir = (mb_type >> 13) & 3;
850             av_dlog(s->avctx, "motion_type=%d\n", motion_type);
851             switch (motion_type) {
852             case MT_FRAME: /* or MT_16X8 */
853                 if (s->picture_structure == PICT_FRAME) {
854                     mb_type |= MB_TYPE_16x16;
855                     s->mv_type = MV_TYPE_16X16;
856                     for (i = 0; i < 2; i++) {
857                         if (USES_LIST(mb_type, i)) {
858                             /* MT_FRAME */
859                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
860                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
861                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
862                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
863                             /* full_pel: only for MPEG-1 */
864                             if (s->full_pel[i]) {
865                                 s->mv[i][0][0] <<= 1;
866                                 s->mv[i][0][1] <<= 1;
867                             }
868                         }
869                     }
870                 } else {
871                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
872                     s->mv_type = MV_TYPE_16X8;
873                     for (i = 0; i < 2; i++) {
874                         if (USES_LIST(mb_type, i)) {
875                             /* MT_16X8 */
876                             for (j = 0; j < 2; j++) {
877                                 s->field_select[i][j] = get_bits1(&s->gb);
878                                 for (k = 0; k < 2; k++) {
879                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
880                                                              s->last_mv[i][j][k]);
881                                     s->last_mv[i][j][k] = val;
882                                     s->mv[i][j][k]      = val;
883                                 }
884                             }
885                         }
886                     }
887                 }
888                 break;
889             case MT_FIELD:
890                 s->mv_type = MV_TYPE_FIELD;
891                 if (s->picture_structure == PICT_FRAME) {
892                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
893                     for (i = 0; i < 2; i++) {
894                         if (USES_LIST(mb_type, i)) {
895                             for (j = 0; j < 2; j++) {
896                                 s->field_select[i][j] = get_bits1(&s->gb);
897                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
898                                                          s->last_mv[i][j][0]);
899                                 s->last_mv[i][j][0] = val;
900                                 s->mv[i][j][0]      = val;
901                                 av_dlog(s->avctx, "fmx=%d\n", val);
902                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
903                                                          s->last_mv[i][j][1] >> 1);
904                                 s->last_mv[i][j][1] = val << 1;
905                                 s->mv[i][j][1]      = val;
906                                 av_dlog(s->avctx, "fmy=%d\n", val);
907                             }
908                         }
909                     }
910                 } else {
911                     av_assert0(!s->progressive_sequence);
912                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
913                     for (i = 0; i < 2; i++) {
914                         if (USES_LIST(mb_type, i)) {
915                             s->field_select[i][0] = get_bits1(&s->gb);
916                             for (k = 0; k < 2; k++) {
917                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
918                                                          s->last_mv[i][0][k]);
919                                 s->last_mv[i][0][k] = val;
920                                 s->last_mv[i][1][k] = val;
921                                 s->mv[i][0][k]      = val;
922                             }
923                         }
924                     }
925                 }
926                 break;
927             case MT_DMV:
928                 if(s->progressive_sequence){
929                     av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
930                     return -1;
931                 }
932                 s->mv_type = MV_TYPE_DMV;
933                 for (i = 0; i < 2; i++) {
934                     if (USES_LIST(mb_type, i)) {
935                         int dmx, dmy, mx, my, m;
936                         const int my_shift = s->picture_structure == PICT_FRAME;
937
938                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
939                                                 s->last_mv[i][0][0]);
940                         s->last_mv[i][0][0] = mx;
941                         s->last_mv[i][1][0] = mx;
942                         dmx = get_dmv(s);
943                         my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
944                                                  s->last_mv[i][0][1] >> my_shift);
945                         dmy = get_dmv(s);
946
947
948                         s->last_mv[i][0][1] = my << my_shift;
949                         s->last_mv[i][1][1] = my << my_shift;
950
951                         s->mv[i][0][0] = mx;
952                         s->mv[i][0][1] = my;
953                         s->mv[i][1][0] = mx; // not used
954                         s->mv[i][1][1] = my; // not used
955
956                         if (s->picture_structure == PICT_FRAME) {
957                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
958
959                             // m = 1 + 2 * s->top_field_first;
960                             m = s->top_field_first ? 1 : 3;
961
962                             /* top -> top pred */
963                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
964                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
965                             m = 4 - m;
966                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
967                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
968                         } else {
969                             mb_type |= MB_TYPE_16x16;
970
971                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
972                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
973                             if (s->picture_structure == PICT_TOP_FIELD)
974                                 s->mv[i][2][1]--;
975                             else
976                                 s->mv[i][2][1]++;
977                         }
978                     }
979                 }
980                 break;
981             default:
982                 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
983                 return -1;
984             }
985         }
986
987         s->mb_intra = 0;
988         if (HAS_CBP(mb_type)) {
989             s->dsp.clear_blocks(s->block[0]);
990
991             cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
992             if (mb_block_count > 6) {
993                  cbp <<= mb_block_count - 6;
994                  cbp  |= get_bits(&s->gb, mb_block_count - 6);
995                  s->dsp.clear_blocks(s->block[6]);
996             }
997             if (cbp <= 0) {
998                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
999                 return -1;
1000             }
1001
1002 #if FF_API_XVMC
1003 FF_DISABLE_DEPRECATION_WARNINGS
1004             //if 1, we memcpy blocks in xvmcvideo
1005             if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
1006                 ff_xvmc_pack_pblocks(s, cbp);
1007                 if (s->swap_uv) {
1008                     exchange_uv(s);
1009                 }
1010             }
1011 FF_ENABLE_DEPRECATION_WARNINGS
1012 #endif /* FF_API_XVMC */
1013
1014             if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1015                 if (s->flags2 & CODEC_FLAG2_FAST) {
1016                     for (i = 0; i < 6; i++) {
1017                         if (cbp & 32) {
1018                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1019                         } else {
1020                             s->block_last_index[i] = -1;
1021                         }
1022                         cbp += cbp;
1023                     }
1024                 } else {
1025                     cbp <<= 12-mb_block_count;
1026
1027                     for (i = 0; i < mb_block_count; i++) {
1028                         if (cbp & (1 << 11)) {
1029                             if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
1030                                 return -1;
1031                         } else {
1032                             s->block_last_index[i] = -1;
1033                         }
1034                         cbp += cbp;
1035                     }
1036                 }
1037             } else {
1038                 if (s->flags2 & CODEC_FLAG2_FAST) {
1039                     for (i = 0; i < 6; i++) {
1040                         if (cbp & 32) {
1041                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1042                         } else {
1043                             s->block_last_index[i] = -1;
1044                         }
1045                         cbp += cbp;
1046                     }
1047                 } else {
1048                     for (i = 0; i < 6; i++) {
1049                         if (cbp & 32) {
1050                             if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
1051                                 return -1;
1052                         } else {
1053                             s->block_last_index[i] = -1;
1054                         }
1055                         cbp += cbp;
1056                     }
1057                 }
1058             }
1059         } else {
1060             for (i = 0; i < 12; i++)
1061                 s->block_last_index[i] = -1;
1062         }
1063     }
1064
1065     s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1066
1067     return 0;
1068 }
1069
1070 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1071 {
1072     Mpeg1Context *s = avctx->priv_data;
1073     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1074     int i;
1075
1076     /* we need some permutation to store matrices,
1077      * until MPV_common_init() sets the real permutation. */
1078     for (i = 0; i < 64; i++)
1079        s2->dsp.idct_permutation[i]=i;
1080
1081     ff_MPV_decode_defaults(s2);
1082
1083     s->mpeg_enc_ctx.avctx  = avctx;
1084     s->mpeg_enc_ctx.flags  = avctx->flags;
1085     s->mpeg_enc_ctx.flags2 = avctx->flags2;
1086     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1087     ff_mpeg12_init_vlcs();
1088
1089     s->mpeg_enc_ctx_allocated      = 0;
1090     s->mpeg_enc_ctx.picture_number = 0;
1091     s->repeat_field                = 0;
1092     s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1093     avctx->color_range = AVCOL_RANGE_MPEG;
1094     if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1095         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1096     else
1097         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1098     return 0;
1099 }
1100
1101 static int mpeg_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
1102 {
1103     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1104     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1105     int err;
1106
1107     if (avctx == avctx_from || !ctx_from->mpeg_enc_ctx_allocated || !s1->context_initialized)
1108         return 0;
1109
1110     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1111     if (err) return err;
1112
1113     if (!ctx->mpeg_enc_ctx_allocated)
1114         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1115
1116     if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1117         s->picture_number++;
1118
1119     return 0;
1120 }
1121
1122 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1123                                  const uint8_t *new_perm)
1124 {
1125     uint16_t temp_matrix[64];
1126     int i;
1127
1128     memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1129
1130     for (i = 0; i < 64; i++) {
1131         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1132     }
1133 }
1134
1135 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1136 #if FF_API_XVMC
1137 #if CONFIG_MPEG_XVMC_DECODER
1138     AV_PIX_FMT_XVMC_MPEG2_IDCT,
1139     AV_PIX_FMT_XVMC_MPEG2_MC,
1140 #endif
1141 #endif /* FF_API_XVMC */
1142 #if CONFIG_MPEG1_VDPAU_HWACCEL
1143     AV_PIX_FMT_VDPAU_MPEG1,
1144     AV_PIX_FMT_VDPAU,
1145 #endif
1146     AV_PIX_FMT_YUV420P,
1147     AV_PIX_FMT_NONE
1148 };
1149
1150 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1151 #if FF_API_XVMC
1152 #if CONFIG_MPEG_XVMC_DECODER
1153     AV_PIX_FMT_XVMC_MPEG2_IDCT,
1154     AV_PIX_FMT_XVMC_MPEG2_MC,
1155 #endif
1156 #endif /* FF_API_XVMC */
1157 #if CONFIG_MPEG2_VDPAU_HWACCEL
1158     AV_PIX_FMT_VDPAU_MPEG2,
1159     AV_PIX_FMT_VDPAU,
1160 #endif
1161 #if CONFIG_MPEG2_DXVA2_HWACCEL
1162     AV_PIX_FMT_DXVA2_VLD,
1163 #endif
1164 #if CONFIG_MPEG2_VAAPI_HWACCEL
1165     AV_PIX_FMT_VAAPI_VLD,
1166 #endif
1167     AV_PIX_FMT_YUV420P,
1168     AV_PIX_FMT_NONE
1169 };
1170
1171 static inline int uses_vdpau(AVCodecContext *avctx) {
1172     return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1173 }
1174
1175 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1176 {
1177     Mpeg1Context *s1 = avctx->priv_data;
1178     MpegEncContext *s = &s1->mpeg_enc_ctx;
1179
1180     if(s->chroma_format < 2) {
1181         return ff_thread_get_format(avctx,
1182                                 avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1183                                 mpeg1_hwaccel_pixfmt_list_420 :
1184                                 mpeg2_hwaccel_pixfmt_list_420);
1185     } else if(s->chroma_format == 2)
1186         return AV_PIX_FMT_YUV422P;
1187     else
1188         return AV_PIX_FMT_YUV444P;
1189 }
1190
1191 static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1192 {
1193 #if FF_API_XVMC
1194 FF_DISABLE_DEPRECATION_WARNINGS
1195     if (avctx->pix_fmt != AV_PIX_FMT_XVMC_MPEG2_IDCT && avctx->pix_fmt != AV_PIX_FMT_XVMC_MPEG2_MC) {
1196         avctx->xvmc_acceleration = 0;
1197     } else if (!avctx->xvmc_acceleration) {
1198         avctx->xvmc_acceleration = 2;
1199     }
1200 FF_ENABLE_DEPRECATION_WARNINGS
1201 #endif /* FF_API_XVMC */
1202     avctx->hwaccel = ff_find_hwaccel(avctx);
1203     // until then pix_fmt may be changed right after codec init
1204 #if FF_API_XVMC
1205     if (avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT ||
1206 #else
1207     if (
1208 #endif
1209         avctx->hwaccel || uses_vdpau(avctx))
1210         if (avctx->idct_algo == FF_IDCT_AUTO)
1211             avctx->idct_algo = FF_IDCT_SIMPLE;
1212 }
1213
1214 /* Call this function when we know all parameters.
1215  * It may be called in different places for MPEG-1 and MPEG-2. */
1216 static int mpeg_decode_postinit(AVCodecContext *avctx)
1217 {
1218     Mpeg1Context *s1 = avctx->priv_data;
1219     MpegEncContext *s = &s1->mpeg_enc_ctx;
1220     uint8_t old_permutation[64];
1221     int ret;
1222
1223     if ((s1->mpeg_enc_ctx_allocated == 0) ||
1224         avctx->coded_width  != s->width   ||
1225         avctx->coded_height != s->height  ||
1226         s1->save_width           != s->width                ||
1227         s1->save_height          != s->height               ||
1228         s1->save_aspect_info     != s->aspect_ratio_info    ||
1229         (s1->save_progressive_seq != s->progressive_sequence && (s->height&31)) ||
1230         0)
1231     {
1232
1233         if (s1->mpeg_enc_ctx_allocated) {
1234             ParseContext pc = s->parse_context;
1235             s->parse_context.buffer = 0;
1236             ff_MPV_common_end(s);
1237             s->parse_context = pc;
1238             s1->mpeg_enc_ctx_allocated = 0;
1239         }
1240
1241         if ((s->width == 0) || (s->height == 0))
1242             return -2;
1243
1244         ret = ff_set_dimensions(avctx, s->width, s->height);
1245         if (ret < 0)
1246             return ret;
1247
1248         if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1249             avctx->rc_max_rate = s->bit_rate;
1250         } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1251                    (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1252             avctx->bit_rate = s->bit_rate;
1253         }
1254         s1->save_aspect_info     = s->aspect_ratio_info;
1255         s1->save_width           = s->width;
1256         s1->save_height          = s->height;
1257         s1->save_progressive_seq = s->progressive_sequence;
1258
1259         /* low_delay may be forced, in this case we will have B-frames
1260          * that behave like P-frames. */
1261         avctx->has_b_frames = !s->low_delay;
1262
1263         if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1264             //MPEG-1 fps
1265             avctx->time_base.den = ff_mpeg12_frame_rate_tab[s->frame_rate_index].num;
1266             avctx->time_base.num = ff_mpeg12_frame_rate_tab[s->frame_rate_index].den;
1267             //MPEG-1 aspect
1268             avctx->sample_aspect_ratio = av_d2q(1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1269             avctx->ticks_per_frame=1;
1270         } else {//MPEG-2
1271         //MPEG-2 fps
1272             av_reduce(&s->avctx->time_base.den,
1273                       &s->avctx->time_base.num,
1274                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1275                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1276                       1 << 30);
1277             avctx->ticks_per_frame = 2;
1278             //MPEG-2 aspect
1279             if (s->aspect_ratio_info > 1) {
1280                 AVRational dar =
1281                     av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1282                                       (AVRational) {s1->pan_scan.width, s1->pan_scan.height}),
1283                              (AVRational) {s->width, s->height});
1284
1285                 // we ignore the spec here and guess a bit as reality does not match the spec, see for example
1286                 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1287                 // issue1613, 621, 562
1288                 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1289                    (av_cmp_q(dar, (AVRational) {4, 3}) && av_cmp_q(dar, (AVRational) {16, 9}))) {
1290                     s->avctx->sample_aspect_ratio =
1291                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1292                                  (AVRational) {s->width, s->height});
1293                 } else {
1294                     s->avctx->sample_aspect_ratio =
1295                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1296                                  (AVRational) {s1->pan_scan.width, s1->pan_scan.height});
1297 //issue1613 4/3 16/9 -> 16/9
1298 //res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1299 //widescreen-issue562.mpg 4/3 16/9 -> 16/9
1300 //                    s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1301                     av_dlog(avctx, "A %d/%d\n",
1302                             ff_mpeg2_aspect[s->aspect_ratio_info].num, ff_mpeg2_aspect[s->aspect_ratio_info].den);
1303                     av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1304                             s->avctx->sample_aspect_ratio.den);
1305                 }
1306             } else {
1307                 s->avctx->sample_aspect_ratio =
1308                     ff_mpeg2_aspect[s->aspect_ratio_info];
1309             }
1310         } // MPEG-2
1311
1312         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1313         setup_hwaccel_for_pixfmt(avctx);
1314
1315         /* Quantization matrices may need reordering
1316          * if DCT permutation is changed. */
1317         memcpy(old_permutation, s->dsp.idct_permutation, 64 * sizeof(uint8_t));
1318
1319         if (ff_MPV_common_init(s) < 0)
1320             return -2;
1321
1322         quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->dsp.idct_permutation);
1323         quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->dsp.idct_permutation);
1324         quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->dsp.idct_permutation);
1325         quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->dsp.idct_permutation);
1326
1327         s1->mpeg_enc_ctx_allocated = 1;
1328     }
1329     return 0;
1330 }
1331
1332 static int mpeg1_decode_picture(AVCodecContext *avctx,
1333                                 const uint8_t *buf, int buf_size)
1334 {
1335     Mpeg1Context *s1 = avctx->priv_data;
1336     MpegEncContext *s = &s1->mpeg_enc_ctx;
1337     int ref, f_code, vbv_delay;
1338
1339     init_get_bits(&s->gb, buf, buf_size*8);
1340
1341     ref = get_bits(&s->gb, 10); /* temporal ref */
1342     s->pict_type = get_bits(&s->gb, 3);
1343     if (s->pict_type == 0 || s->pict_type > 3)
1344         return -1;
1345
1346     vbv_delay = get_bits(&s->gb, 16);
1347     s->vbv_delay = vbv_delay;
1348     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
1349         s->full_pel[0] = get_bits1(&s->gb);
1350         f_code = get_bits(&s->gb, 3);
1351         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1352             return -1;
1353         f_code += !f_code;
1354         s->mpeg_f_code[0][0] = f_code;
1355         s->mpeg_f_code[0][1] = f_code;
1356     }
1357     if (s->pict_type == AV_PICTURE_TYPE_B) {
1358         s->full_pel[1] = get_bits1(&s->gb);
1359         f_code = get_bits(&s->gb, 3);
1360         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1361             return -1;
1362         f_code += !f_code;
1363         s->mpeg_f_code[1][0] = f_code;
1364         s->mpeg_f_code[1][1] = f_code;
1365     }
1366     s->current_picture.f.pict_type = s->pict_type;
1367     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1368
1369     if (avctx->debug & FF_DEBUG_PICT_INFO)
1370         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1371
1372     s->y_dc_scale = 8;
1373     s->c_dc_scale = 8;
1374     return 0;
1375 }
1376
1377 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1378 {
1379     MpegEncContext *s= &s1->mpeg_enc_ctx;
1380     int horiz_size_ext, vert_size_ext;
1381     int bit_rate_ext;
1382
1383     skip_bits(&s->gb, 1); /* profile and level esc*/
1384     s->avctx->profile       = get_bits(&s->gb, 3);
1385     s->avctx->level         = get_bits(&s->gb, 4);
1386     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1387     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1388     horiz_size_ext          = get_bits(&s->gb, 2);
1389     vert_size_ext           = get_bits(&s->gb, 2);
1390     s->width  |= (horiz_size_ext << 12);
1391     s->height |= (vert_size_ext  << 12);
1392     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1393     s->bit_rate += (bit_rate_ext << 18) * 400;
1394     skip_bits1(&s->gb); /* marker */
1395     s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1396
1397     s->low_delay = get_bits1(&s->gb);
1398     if (s->flags & CODEC_FLAG_LOW_DELAY)
1399         s->low_delay = 1;
1400
1401     s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1402     s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1403
1404     av_dlog(s->avctx, "sequence extension\n");
1405     s->codec_id      = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1406
1407     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1408         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%d\n",
1409                s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format, s->avctx->rc_buffer_size, s->bit_rate);
1410
1411 }
1412
1413 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1414 {
1415     MpegEncContext *s = &s1->mpeg_enc_ctx;
1416     int color_description, w, h;
1417
1418     skip_bits(&s->gb, 3); /* video format */
1419     color_description = get_bits1(&s->gb);
1420     if (color_description) {
1421         s->avctx->color_primaries = get_bits(&s->gb, 8);
1422         s->avctx->color_trc       = get_bits(&s->gb, 8);
1423         s->avctx->colorspace      = get_bits(&s->gb, 8);
1424     }
1425     w = get_bits(&s->gb, 14);
1426     skip_bits(&s->gb, 1); //marker
1427     h = get_bits(&s->gb, 14);
1428     // remaining 3 bits are zero padding
1429
1430     s1->pan_scan.width  = 16 * w;
1431     s1->pan_scan.height = 16 * h;
1432
1433     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1434         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1435 }
1436
1437 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1438 {
1439     MpegEncContext *s = &s1->mpeg_enc_ctx;
1440     int i, nofco;
1441
1442     nofco = 1;
1443     if (s->progressive_sequence) {
1444         if (s->repeat_first_field) {
1445             nofco++;
1446             if (s->top_field_first)
1447                 nofco++;
1448         }
1449     } else {
1450         if (s->picture_structure == PICT_FRAME) {
1451             nofco++;
1452             if (s->repeat_first_field)
1453                 nofco++;
1454         }
1455     }
1456     for (i = 0; i < nofco; i++) {
1457         s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1458         skip_bits(&s->gb, 1); // marker
1459         s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1460         skip_bits(&s->gb, 1); // marker
1461     }
1462
1463     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1464         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1465                s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1466                s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1467                s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1468 }
1469
1470 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra)
1471 {
1472     int i;
1473
1474     for (i = 0; i < 64; i++) {
1475         int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1476         int v = get_bits(&s->gb, 8);
1477         if (v == 0) {
1478             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1479             return -1;
1480         }
1481         if (intra && i == 0 && v != 8) {
1482             av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1483             v = 8; // needed by pink.mpg / issue1046
1484         }
1485         matrix0[j] = v;
1486         if (matrix1)
1487             matrix1[j] = v;
1488     }
1489     return 0;
1490 }
1491
1492 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1493 {
1494     av_dlog(s->avctx, "matrix extension\n");
1495
1496     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1497     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1498     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL           , 1);
1499     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL           , 0);
1500 }
1501
1502 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1503 {
1504     MpegEncContext *s = &s1->mpeg_enc_ctx;
1505
1506     s->full_pel[0] = s->full_pel[1] = 0;
1507     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1508     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1509     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1510     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1511     if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1512         av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1513         if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1514             if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1515                 s->pict_type = AV_PICTURE_TYPE_I;
1516             else
1517                 s->pict_type = AV_PICTURE_TYPE_P;
1518         } else
1519             s->pict_type = AV_PICTURE_TYPE_B;
1520         s->current_picture.f.pict_type = s->pict_type;
1521         s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1522     }
1523     s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1524     s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1525     s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1526     s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1527
1528     s->intra_dc_precision         = get_bits(&s->gb, 2);
1529     s->picture_structure          = get_bits(&s->gb, 2);
1530     s->top_field_first            = get_bits1(&s->gb);
1531     s->frame_pred_frame_dct       = get_bits1(&s->gb);
1532     s->concealment_motion_vectors = get_bits1(&s->gb);
1533     s->q_scale_type               = get_bits1(&s->gb);
1534     s->intra_vlc_format           = get_bits1(&s->gb);
1535     s->alternate_scan             = get_bits1(&s->gb);
1536     s->repeat_first_field         = get_bits1(&s->gb);
1537     s->chroma_420_type            = get_bits1(&s->gb);
1538     s->progressive_frame          = get_bits1(&s->gb);
1539
1540
1541     if (s->alternate_scan) {
1542         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1543         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1544     } else {
1545         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1546         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1547     }
1548
1549     /* composite display not parsed */
1550     av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1551     av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1552     av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1553     av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1554     av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1555     av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1556     av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1557     av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1558     av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1559 }
1560
1561 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1562 {
1563     AVCodecContext *avctx = s->avctx;
1564     Mpeg1Context *s1 = (Mpeg1Context*)s;
1565
1566     /* start frame decoding */
1567     if (s->first_field || s->picture_structure == PICT_FRAME) {
1568         AVFrameSideData *pan_scan;
1569
1570         if (ff_MPV_frame_start(s, avctx) < 0)
1571             return -1;
1572
1573         ff_mpeg_er_frame_start(s);
1574
1575         /* first check if we must repeat the frame */
1576         s->current_picture_ptr->f.repeat_pict = 0;
1577         if (s->repeat_first_field) {
1578             if (s->progressive_sequence) {
1579                 if (s->top_field_first)
1580                     s->current_picture_ptr->f.repeat_pict = 4;
1581                 else
1582                     s->current_picture_ptr->f.repeat_pict = 2;
1583             } else if (s->progressive_frame) {
1584                 s->current_picture_ptr->f.repeat_pict = 1;
1585             }
1586         }
1587
1588         pan_scan = av_frame_new_side_data(&s->current_picture_ptr->f,
1589                                           AV_FRAME_DATA_PANSCAN,
1590                                           sizeof(s1->pan_scan));
1591         if (!pan_scan)
1592             return AVERROR(ENOMEM);
1593         memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1594
1595         if (s1->a53_caption) {
1596             AVFrameSideData *sd = av_frame_new_side_data(
1597                 &s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1598                 s1->a53_caption_size);
1599             if (sd)
1600                 memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1601             av_freep(&s1->a53_caption);
1602         }
1603         if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1604             ff_thread_finish_setup(avctx);
1605     } else { // second field
1606         int i;
1607
1608         if (!s->current_picture_ptr) {
1609             av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1610             return -1;
1611         }
1612
1613         if (s->avctx->hwaccel &&
1614             (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1615             if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1616                 av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode first field\n");
1617         }
1618
1619         for (i = 0; i < 4; i++) {
1620             s->current_picture.f.data[i] = s->current_picture_ptr->f.data[i];
1621             if (s->picture_structure == PICT_BOTTOM_FIELD) {
1622                 s->current_picture.f.data[i] += s->current_picture_ptr->f.linesize[i];
1623             }
1624         }
1625     }
1626
1627     if (avctx->hwaccel) {
1628         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1629             return -1;
1630     }
1631
1632 #if FF_API_XVMC
1633 FF_DISABLE_DEPRECATION_WARNINGS
1634 // MPV_frame_start will call this function too,
1635 // but we need to call it on every field
1636     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1637         if (ff_xvmc_field_start(s, avctx) < 0)
1638             return -1;
1639 FF_ENABLE_DEPRECATION_WARNINGS
1640 #endif /* FF_API_XVMC */
1641
1642     return 0;
1643 }
1644
1645 #define DECODE_SLICE_ERROR -1
1646 #define DECODE_SLICE_OK     0
1647
1648 /**
1649  * Decode a slice.
1650  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1651  * @return DECODE_SLICE_ERROR if the slice is damaged,
1652  *         DECODE_SLICE_OK if this slice is OK
1653  */
1654 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1655                              const uint8_t **buf, int buf_size)
1656 {
1657     AVCodecContext *avctx = s->avctx;
1658     const int lowres      = s->avctx->lowres;
1659     const int field_pic   = s->picture_structure != PICT_FRAME;
1660
1661     s->resync_mb_x =
1662     s->resync_mb_y = -1;
1663
1664     av_assert0(mb_y < s->mb_height);
1665
1666     init_get_bits(&s->gb, *buf, buf_size * 8);
1667     if(s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1668         skip_bits(&s->gb, 3);
1669
1670     ff_mpeg1_clean_buffers(s);
1671     s->interlaced_dct = 0;
1672
1673     s->qscale = get_qscale(s);
1674
1675     if (s->qscale == 0) {
1676         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1677         return -1;
1678     }
1679
1680     /* extra slice info */
1681     if (skip_1stop_8data_bits(&s->gb) < 0)
1682         return AVERROR_INVALIDDATA;
1683
1684     s->mb_x = 0;
1685
1686     if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1687         skip_bits1(&s->gb);
1688     } else {
1689         while (get_bits_left(&s->gb) > 0) {
1690             int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1691                                 MBINCR_VLC_BITS, 2);
1692             if (code < 0) {
1693                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1694                 return -1;
1695             }
1696             if (code >= 33) {
1697                 if (code == 33) {
1698                     s->mb_x += 33;
1699                 }
1700                 /* otherwise, stuffing, nothing to do */
1701             } else {
1702                 s->mb_x += code;
1703                 break;
1704             }
1705         }
1706     }
1707
1708     if (s->mb_x >= (unsigned)s->mb_width) {
1709         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1710         return -1;
1711     }
1712
1713     if (avctx->hwaccel) {
1714         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1715         int start_code = -1;
1716         buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1717         if (buf_end < *buf + buf_size)
1718             buf_end -= 4;
1719         s->mb_y = mb_y;
1720         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1721             return DECODE_SLICE_ERROR;
1722         *buf = buf_end;
1723         return DECODE_SLICE_OK;
1724     }
1725
1726     s->resync_mb_x = s->mb_x;
1727     s->resync_mb_y = s->mb_y = mb_y;
1728     s->mb_skip_run = 0;
1729     ff_init_block_index(s);
1730
1731     if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1732         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1733              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",
1734                     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],
1735                     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")),
1736                     s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1737                     s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1738                     s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1739         }
1740     }
1741
1742     for (;;) {
1743 #if FF_API_XVMC
1744 FF_DISABLE_DEPRECATION_WARNINGS
1745         // If 1, we memcpy blocks in xvmcvideo.
1746         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1747             ff_xvmc_init_block(s); // set s->block
1748 FF_ENABLE_DEPRECATION_WARNINGS
1749 #endif /* FF_API_XVMC */
1750
1751         if (mpeg_decode_mb(s, s->block) < 0)
1752             return -1;
1753
1754         if (s->current_picture.motion_val[0] && !s->encoding) { // note motion_val is normally NULL unless we want to extract the MVs
1755             const int wrap = s->b8_stride;
1756             int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1757             int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1758             int motion_x, motion_y, dir, i;
1759
1760             for (i = 0; i < 2; i++) {
1761                 for (dir = 0; dir < 2; dir++) {
1762                     if (s->mb_intra || (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1763                         motion_x = motion_y = 0;
1764                     } else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1765                         motion_x = s->mv[dir][0][0];
1766                         motion_y = s->mv[dir][0][1];
1767                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1768                         motion_x = s->mv[dir][i][0];
1769                         motion_y = s->mv[dir][i][1];
1770                     }
1771
1772                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1773                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1774                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1775                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1776                     s->current_picture.ref_index [dir][b8_xy    ] =
1777                     s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1778                     av_assert2(s->field_select[dir][i] == 0 || s->field_select[dir][i] == 1);
1779                 }
1780                 xy += wrap;
1781                 b8_xy +=2;
1782             }
1783         }
1784
1785         s->dest[0] += 16 >> lowres;
1786         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1787         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1788
1789         ff_MPV_decode_mb(s, s->block);
1790
1791         if (++s->mb_x >= s->mb_width) {
1792             const int mb_size = 16 >> s->avctx->lowres;
1793
1794             ff_mpeg_draw_horiz_band(s, mb_size*(s->mb_y >> field_pic), mb_size);
1795             ff_MPV_report_decode_progress(s);
1796
1797             s->mb_x = 0;
1798             s->mb_y += 1 << field_pic;
1799
1800             if (s->mb_y >= s->mb_height) {
1801                 int left   = get_bits_left(&s->gb);
1802                 int is_d10 = s->chroma_format == 2 && s->pict_type == AV_PICTURE_TYPE_I && avctx->profile == 0 && avctx->level == 5
1803                              && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1804                              && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1805
1806                 if (left >= 32 && !is_d10) {
1807                     GetBitContext gb = s->gb;
1808                     align_get_bits(&gb);
1809                     if (show_bits(&gb, 24) == 0x060E2B) {
1810                         av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1811                         is_d10 = 1;
1812                     }
1813                 }
1814
1815                 if (left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1816                     || ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1817                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1818                     return -1;
1819                 } else
1820                     goto eos;
1821             }
1822
1823             ff_init_block_index(s);
1824         }
1825
1826         /* skip mb handling */
1827         if (s->mb_skip_run == -1) {
1828             /* read increment again */
1829             s->mb_skip_run = 0;
1830             for (;;) {
1831                 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1832                                     MBINCR_VLC_BITS, 2);
1833                 if (code < 0) {
1834                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1835                     return -1;
1836                 }
1837                 if (code >= 33) {
1838                     if (code == 33) {
1839                         s->mb_skip_run += 33;
1840                     } else if (code == 35) {
1841                         if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1842                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1843                             return -1;
1844                         }
1845                         goto eos; /* end of slice */
1846                     }
1847                     /* otherwise, stuffing, nothing to do */
1848                 } else {
1849                     s->mb_skip_run += code;
1850                     break;
1851                 }
1852             }
1853             if (s->mb_skip_run) {
1854                 int i;
1855                 if (s->pict_type == AV_PICTURE_TYPE_I) {
1856                     av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1857                     return -1;
1858                 }
1859
1860                 /* skip mb */
1861                 s->mb_intra = 0;
1862                 for (i = 0; i < 12; i++)
1863                     s->block_last_index[i] = -1;
1864                 if (s->picture_structure == PICT_FRAME)
1865                     s->mv_type = MV_TYPE_16X16;
1866                 else
1867                     s->mv_type = MV_TYPE_FIELD;
1868                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1869                     /* if P type, zero motion vector is implied */
1870                     s->mv_dir             = MV_DIR_FORWARD;
1871                     s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1872                     s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1873                     s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1874                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1875                 } else {
1876                     /* if B type, reuse previous vectors and directions */
1877                     s->mv[0][0][0] = s->last_mv[0][0][0];
1878                     s->mv[0][0][1] = s->last_mv[0][0][1];
1879                     s->mv[1][0][0] = s->last_mv[1][0][0];
1880                     s->mv[1][0][1] = s->last_mv[1][0][1];
1881                 }
1882             }
1883         }
1884     }
1885 eos: // end of slice
1886     *buf += (get_bits_count(&s->gb)-1)/8;
1887     av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1888     return 0;
1889 }
1890
1891 static int slice_decode_thread(AVCodecContext *c, void *arg)
1892 {
1893     MpegEncContext *s   = *(void**)arg;
1894     const uint8_t *buf  = s->gb.buffer;
1895     int mb_y            = s->start_mb_y;
1896     const int field_pic = s->picture_structure != PICT_FRAME;
1897
1898     s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1899
1900     for (;;) {
1901         uint32_t start_code;
1902         int ret;
1903
1904         ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1905         emms_c();
1906         av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1907                 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1908                 s->start_mb_y, s->end_mb_y, s->er.error_count);
1909         if (ret < 0) {
1910             if (c->err_recognition & AV_EF_EXPLODE)
1911                 return ret;
1912             if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1913                 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);
1914         } else {
1915             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);
1916         }
1917
1918         if (s->mb_y == s->end_mb_y)
1919             return 0;
1920
1921         start_code = -1;
1922         buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
1923         mb_y= start_code - SLICE_MIN_START_CODE;
1924         if(s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1925             mb_y += (*buf&0xE0)<<2;
1926         mb_y <<= field_pic;
1927         if (s->picture_structure == PICT_BOTTOM_FIELD)
1928             mb_y++;
1929         if (mb_y < 0 || mb_y >= s->end_mb_y)
1930             return -1;
1931     }
1932 }
1933
1934 /**
1935  * Handle slice ends.
1936  * @return 1 if it seems to be the last slice
1937  */
1938 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1939 {
1940     Mpeg1Context *s1 = avctx->priv_data;
1941     MpegEncContext *s = &s1->mpeg_enc_ctx;
1942
1943     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1944         return 0;
1945
1946     if (s->avctx->hwaccel) {
1947         if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1948             av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1949     }
1950
1951 #if FF_API_XVMC
1952 FF_DISABLE_DEPRECATION_WARNINGS
1953     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1954         ff_xvmc_field_end(s);
1955 FF_ENABLE_DEPRECATION_WARNINGS
1956 #endif /* FF_API_XVMC */
1957
1958     /* end of slice reached */
1959     if (/*s->mb_y << field_pic == s->mb_height &&*/ !s->first_field && !s1->first_slice) {
1960         /* end of image */
1961
1962         ff_er_frame_end(&s->er);
1963
1964         ff_MPV_frame_end(s);
1965
1966         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
1967             int ret = av_frame_ref(pict, &s->current_picture_ptr->f);
1968             if (ret < 0)
1969                 return ret;
1970             ff_print_debug_info(s, s->current_picture_ptr, pict);
1971             ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
1972         } else {
1973             if (avctx->active_thread_type & FF_THREAD_FRAME)
1974                 s->picture_number++;
1975             /* latency of 1 frame for I- and P-frames */
1976             /* XXX: use another variable than picture_number */
1977             if (s->last_picture_ptr != NULL) {
1978                 int ret = av_frame_ref(pict, &s->last_picture_ptr->f);
1979                 if (ret < 0)
1980                     return ret;
1981                 ff_print_debug_info(s, s->last_picture_ptr, pict);
1982                 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
1983             }
1984         }
1985
1986         return 1;
1987     } else {
1988         return 0;
1989     }
1990 }
1991
1992 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1993                                  const uint8_t *buf, int buf_size)
1994 {
1995     Mpeg1Context *s1 = avctx->priv_data;
1996     MpegEncContext *s = &s1->mpeg_enc_ctx;
1997     int width, height;
1998     int i, v, j;
1999
2000     init_get_bits(&s->gb, buf, buf_size*8);
2001
2002     width  = get_bits(&s->gb, 12);
2003     height = get_bits(&s->gb, 12);
2004     if (width == 0 || height == 0) {
2005         av_log(avctx, AV_LOG_WARNING, "Invalid horizontal or vertical size "
2006                "value.\n");
2007         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2008             return AVERROR_INVALIDDATA;
2009     }
2010     s->aspect_ratio_info = get_bits(&s->gb, 4);
2011     if (s->aspect_ratio_info == 0) {
2012         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2013         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2014             return -1;
2015     }
2016     s->frame_rate_index = get_bits(&s->gb, 4);
2017     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2018         return -1;
2019     s->bit_rate = get_bits(&s->gb, 18) * 400;
2020     if (get_bits1(&s->gb) == 0) /* marker */
2021         return -1;
2022     s->width  = width;
2023     s->height = height;
2024
2025     s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2026     skip_bits(&s->gb, 1);
2027
2028     /* get matrix */
2029     if (get_bits1(&s->gb)) {
2030         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2031     } else {
2032         for (i = 0; i < 64; i++) {
2033             j = s->dsp.idct_permutation[i];
2034             v = ff_mpeg1_default_intra_matrix[i];
2035             s->intra_matrix[j]        = v;
2036             s->chroma_intra_matrix[j] = v;
2037         }
2038     }
2039     if (get_bits1(&s->gb)) {
2040         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2041     } else {
2042         for (i = 0; i < 64; i++) {
2043             int j = s->dsp.idct_permutation[i];
2044             v = ff_mpeg1_default_non_intra_matrix[i];
2045             s->inter_matrix[j]        = v;
2046             s->chroma_inter_matrix[j] = v;
2047         }
2048     }
2049
2050     if (show_bits(&s->gb, 23) != 0) {
2051         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2052         return -1;
2053     }
2054
2055     /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2056     s->progressive_sequence = 1;
2057     s->progressive_frame    = 1;
2058     s->picture_structure    = PICT_FRAME;
2059     s->first_field          = 0;
2060     s->frame_pred_frame_dct = 1;
2061     s->chroma_format        = 1;
2062     s->codec_id             = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2063     s->out_format           = FMT_MPEG1;
2064     s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2065     if (s->flags & CODEC_FLAG_LOW_DELAY)
2066         s->low_delay = 1;
2067
2068     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2069         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2070                s->avctx->rc_buffer_size, s->bit_rate);
2071
2072     return 0;
2073 }
2074
2075 static int vcr2_init_sequence(AVCodecContext *avctx)
2076 {
2077     Mpeg1Context *s1 = avctx->priv_data;
2078     MpegEncContext *s = &s1->mpeg_enc_ctx;
2079     int i, v;
2080
2081     /* start new MPEG-1 context decoding */
2082     s->out_format = FMT_MPEG1;
2083     if (s1->mpeg_enc_ctx_allocated) {
2084         ff_MPV_common_end(s);
2085         s1->mpeg_enc_ctx_allocated = 0;
2086     }
2087     s->width  = avctx->coded_width;
2088     s->height = avctx->coded_height;
2089     avctx->has_b_frames = 0; // true?
2090     s->low_delay = 1;
2091
2092     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2093     setup_hwaccel_for_pixfmt(avctx);
2094
2095     if (ff_MPV_common_init(s) < 0)
2096         return -1;
2097     s1->mpeg_enc_ctx_allocated = 1;
2098
2099     for (i = 0; i < 64; i++) {
2100         int j = s->dsp.idct_permutation[i];
2101         v = ff_mpeg1_default_intra_matrix[i];
2102         s->intra_matrix[j]        = v;
2103         s->chroma_intra_matrix[j] = v;
2104
2105         v = ff_mpeg1_default_non_intra_matrix[i];
2106         s->inter_matrix[j]        = v;
2107         s->chroma_inter_matrix[j] = v;
2108     }
2109
2110     s->progressive_sequence  = 1;
2111     s->progressive_frame     = 1;
2112     s->picture_structure     = PICT_FRAME;
2113     s->first_field           = 0;
2114     s->frame_pred_frame_dct  = 1;
2115     s->chroma_format         = 1;
2116     if (s->codec_tag == AV_RL32("BW10")) {
2117         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2118     } else {
2119         s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2120         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2121     }
2122     s1->save_width           = s->width;
2123     s1->save_height          = s->height;
2124     s1->save_progressive_seq = s->progressive_sequence;
2125     return 0;
2126 }
2127
2128
2129 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2130                               const uint8_t *p, int buf_size)
2131 {
2132     Mpeg1Context *s1 = avctx->priv_data;
2133
2134     if (buf_size >= 6 &&
2135         p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2136         p[4] == 3 && (p[5] & 0x40)) {
2137         /* extract A53 Part 4 CC data */
2138         int cc_count = p[5] & 0x1f;
2139         if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2140             av_freep(&s1->a53_caption);
2141             s1->a53_caption_size = cc_count * 3;
2142             s1->a53_caption = av_malloc(s1->a53_caption_size);
2143             if (s1->a53_caption) {
2144                 memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2145             }
2146         }
2147         return 1;
2148     } else if (buf_size >= 11 &&
2149         p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2150         /* extract DVD CC data */
2151         int cc_count = 0;
2152         int i;
2153         // There is a caption count field in the data, but it is often
2154         // incorect.  So count the number of captions present.
2155         for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2156             cc_count++;
2157         // Transform the DVD format into A53 Part 4 format
2158         if (cc_count > 0) {
2159             av_freep(&s1->a53_caption);
2160             s1->a53_caption_size = cc_count * 6;
2161             s1->a53_caption = av_malloc(s1->a53_caption_size);
2162             if (s1->a53_caption) {
2163                 uint8_t field1 = !!(p[4] & 0x80);
2164                 uint8_t *cap = s1->a53_caption;
2165                 p += 5;
2166                 for (i = 0; i < cc_count; i++) {
2167                     cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2168                     cap[1] = p[1];
2169                     cap[2] = p[2];
2170                     cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2171                     cap[4] = p[4];
2172                     cap[5] = p[5];
2173                     cap += 6;
2174                     p += 6;
2175                 }
2176             }
2177         }
2178         return 1;
2179     }
2180     return 0;
2181 }
2182
2183 static void mpeg_decode_user_data(AVCodecContext *avctx,
2184                                   const uint8_t *p, int buf_size)
2185 {
2186     Mpeg1Context *s = avctx->priv_data;
2187     const uint8_t *buf_end = p + buf_size;
2188
2189     if(buf_size > 29){
2190         int i;
2191         for(i=0; i<20; i++)
2192             if(!memcmp(p+i, "\0TMPGEXS\0", 9)){
2193                 s->tmpgexs= 1;
2194             }
2195
2196 /*        for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2197             av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2198         }
2199             av_log(avctx, AV_LOG_ERROR, "\n");*/
2200     }
2201
2202     /* we parse the DTG active format information */
2203     if (buf_end - p >= 5 &&
2204         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2205         int flags = p[4];
2206         p += 5;
2207         if (flags & 0x80) {
2208             /* skip event id */
2209             p += 2;
2210         }
2211         if (flags & 0x40) {
2212             if (buf_end - p < 1)
2213                 return;
2214             avctx->dtg_active_format = p[0] & 0x0f;
2215         }
2216     } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2217         return;
2218     }
2219 }
2220
2221 static void mpeg_decode_gop(AVCodecContext *avctx,
2222                             const uint8_t *buf, int buf_size)
2223 {
2224     Mpeg1Context *s1  = avctx->priv_data;
2225     MpegEncContext *s = &s1->mpeg_enc_ctx;
2226     int broken_link;
2227     int64_t tc;
2228
2229     init_get_bits(&s->gb, buf, buf_size*8);
2230
2231     tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2232
2233     s->closed_gop = get_bits1(&s->gb);
2234     /*broken_link indicate that after editing the
2235       reference frames of the first B-Frames after GOP I-Frame
2236       are missing (open gop)*/
2237     broken_link = get_bits1(&s->gb);
2238
2239     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2240         char tcbuf[AV_TIMECODE_STR_SIZE];
2241         av_timecode_make_mpeg_tc_string(tcbuf, tc);
2242         av_log(s->avctx, AV_LOG_DEBUG,
2243                "GOP (%s) closed_gop=%d broken_link=%d\n",
2244                tcbuf, s->closed_gop, broken_link);
2245     }
2246 }
2247
2248 static int decode_chunks(AVCodecContext *avctx,
2249                          AVFrame *picture, int *got_output,
2250                          const uint8_t *buf, int buf_size)
2251 {
2252     Mpeg1Context *s = avctx->priv_data;
2253     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2254     const uint8_t *buf_ptr = buf;
2255     const uint8_t *buf_end = buf + buf_size;
2256     int ret, input_size;
2257     int last_code = 0, skip_frame = 0;
2258     int picture_start_code_seen = 0;
2259
2260     for (;;) {
2261         /* find next start code */
2262         uint32_t start_code = -1;
2263         buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2264         if (start_code > 0x1ff) {
2265             if (!skip_frame) {
2266                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2267                     !avctx->hwaccel) {
2268                     int i;
2269                     av_assert0(avctx->thread_count > 1);
2270
2271                     avctx->execute(avctx, slice_decode_thread,  &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
2272                     for (i = 0; i < s->slice_count; i++)
2273                         s2->er.error_count += s2->thread_context[i]->er.error_count;
2274                 }
2275
2276                 if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
2277                     && uses_vdpau(avctx))
2278                     ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2279
2280                 ret = slice_end(avctx, picture);
2281                 if (ret < 0)
2282                     return ret;
2283                 else if (ret) {
2284                     if (s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2285                         *got_output = 1;
2286                 }
2287             }
2288             s2->pict_type = 0;
2289
2290             if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2291                 return AVERROR_INVALIDDATA;
2292
2293             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2294         }
2295
2296         input_size = buf_end - buf_ptr;
2297
2298         if (avctx->debug & FF_DEBUG_STARTCODE) {
2299             av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2300         }
2301
2302         /* prepare data for next start code */
2303         switch (start_code) {
2304         case SEQ_START_CODE:
2305             if (last_code == 0) {
2306                 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2307                 if(buf != avctx->extradata)
2308                     s->sync=1;
2309             } else {
2310                 av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2311                 if (avctx->err_recognition & AV_EF_EXPLODE)
2312                     return AVERROR_INVALIDDATA;
2313             }
2314             break;
2315
2316         case PICTURE_START_CODE:
2317             if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2318                /* If it's a frame picture, there can't be more than one picture header.
2319                   Yet, it does happen and we need to handle it. */
2320                av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2321                break;
2322             }
2323             picture_start_code_seen = 1;
2324
2325             if (s2->width <= 0 || s2->height <= 0) {
2326                 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2327                        s2->width, s2->height);
2328                 return AVERROR_INVALIDDATA;
2329             }
2330
2331             if(s->tmpgexs){
2332                 s2->intra_dc_precision= 3;
2333                 s2->intra_matrix[0]= 1;
2334             }
2335             if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2336                 !avctx->hwaccel && s->slice_count) {
2337                 int i;
2338
2339                 avctx->execute(avctx, slice_decode_thread,
2340                                s2->thread_context, NULL,
2341                                s->slice_count, sizeof(void*));
2342                 for (i = 0; i < s->slice_count; i++)
2343                     s2->er.error_count += s2->thread_context[i]->er.error_count;
2344                 s->slice_count = 0;
2345             }
2346             if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2347                 ret = mpeg_decode_postinit(avctx);
2348                 if (ret < 0) {
2349                     av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
2350                     return ret;
2351                 }
2352
2353                 /* we have a complete image: we try to decompress it */
2354                 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2355                     s2->pict_type = 0;
2356                 s->first_slice = 1;
2357                 last_code = PICTURE_START_CODE;
2358             } else {
2359                 av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
2360                 if (avctx->err_recognition & AV_EF_EXPLODE)
2361                     return AVERROR_INVALIDDATA;
2362             }
2363             break;
2364         case EXT_START_CODE:
2365             init_get_bits(&s2->gb, buf_ptr, input_size*8);
2366
2367             switch (get_bits(&s2->gb, 4)) {
2368             case 0x1:
2369                 if (last_code == 0) {
2370                 mpeg_decode_sequence_extension(s);
2371                 } else {
2372                     av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
2373                     if (avctx->err_recognition & AV_EF_EXPLODE)
2374                         return AVERROR_INVALIDDATA;
2375                 }
2376                 break;
2377             case 0x2:
2378                 mpeg_decode_sequence_display_extension(s);
2379                 break;
2380             case 0x3:
2381                 mpeg_decode_quant_matrix_extension(s2);
2382                 break;
2383             case 0x7:
2384                 mpeg_decode_picture_display_extension(s);
2385                 break;
2386             case 0x8:
2387                 if (last_code == PICTURE_START_CODE) {
2388                     mpeg_decode_picture_coding_extension(s);
2389                 } else {
2390                     av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
2391                     if (avctx->err_recognition & AV_EF_EXPLODE)
2392                         return AVERROR_INVALIDDATA;
2393                 }
2394                 break;
2395             }
2396             break;
2397         case USER_START_CODE:
2398             mpeg_decode_user_data(avctx, buf_ptr, input_size);
2399             break;
2400         case GOP_START_CODE:
2401             if (last_code == 0) {
2402                 s2->first_field=0;
2403                 mpeg_decode_gop(avctx, buf_ptr, input_size);
2404                 s->sync=1;
2405             } else {
2406                 av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
2407                 if (avctx->err_recognition & AV_EF_EXPLODE)
2408                     return AVERROR_INVALIDDATA;
2409             }
2410             break;
2411         default:
2412             if (start_code >= SLICE_MIN_START_CODE &&
2413                 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2414
2415                 if (s2->progressive_sequence && !s2->progressive_frame) {
2416                     s2->progressive_frame = 1;
2417                     av_log(s2->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
2418                 }
2419
2420                 if (s2->picture_structure == 0 || (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2421                     av_log(s2->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s2->picture_structure);
2422                     s2->picture_structure = PICT_FRAME;
2423                 }
2424
2425                 if (s2->progressive_sequence && !s2->frame_pred_frame_dct) {
2426                     av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2427                 }
2428
2429                 if (s2->picture_structure == PICT_FRAME) {
2430                     s2->first_field = 0;
2431                     s2->v_edge_pos  = 16 * s2->mb_height;
2432                 } else {
2433                     s2->first_field ^= 1;
2434                     s2->v_edge_pos   = 8 * s2->mb_height;
2435                     memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2436                 }
2437             }
2438             if (start_code >= SLICE_MIN_START_CODE &&
2439                 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2440                 const int field_pic = s2->picture_structure != PICT_FRAME;
2441                 int mb_y = start_code - SLICE_MIN_START_CODE;
2442                 last_code = SLICE_MIN_START_CODE;
2443                 if(s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2444                     mb_y += (*buf_ptr&0xE0)<<2;
2445
2446                 mb_y <<= field_pic;
2447                 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2448                     mb_y++;
2449
2450                 if (buf_end - buf_ptr < 2) {
2451                     av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2452                     return AVERROR_INVALIDDATA;
2453                 }
2454
2455                 if (mb_y >= s2->mb_height) {
2456                     av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2457                     return -1;
2458                 }
2459
2460                 if (s2->last_picture_ptr == NULL) {
2461                 /* Skip B-frames if we do not have reference frames and gop is not closed */
2462                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
2463                         if (!s2->closed_gop) {
2464                             skip_frame = 1;
2465                             break;
2466                         }
2467                     }
2468                 }
2469                 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
2470                     s->sync=1;
2471                 if (s2->next_picture_ptr == NULL) {
2472                 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2473                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2474                         skip_frame = 1;
2475                         break;
2476                     }
2477                 }
2478                 if ((avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type == AV_PICTURE_TYPE_B) ||
2479                     (avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type != AV_PICTURE_TYPE_I) ||
2480                      avctx->skip_frame >= AVDISCARD_ALL) {
2481                     skip_frame = 1;
2482                     break;
2483                 }
2484
2485                 if (!s->mpeg_enc_ctx_allocated)
2486                     break;
2487
2488                 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2489                     if (mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2490                         break;
2491                 }
2492
2493                 if (!s2->pict_type) {
2494                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2495                     if (avctx->err_recognition & AV_EF_EXPLODE)
2496                         return AVERROR_INVALIDDATA;
2497                     break;
2498                 }
2499
2500                 if (s->first_slice) {
2501                     skip_frame = 0;
2502                     s->first_slice = 0;
2503                     if (mpeg_field_start(s2, buf, buf_size) < 0)
2504                         return -1;
2505                 }
2506                 if (!s2->current_picture_ptr) {
2507                     av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2508                     return AVERROR_INVALIDDATA;
2509                 }
2510
2511                 if (uses_vdpau(avctx)) {
2512                     s->slice_count++;
2513                     break;
2514                 }
2515
2516                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2517                     !avctx->hwaccel) {
2518                     int threshold = (s2->mb_height * s->slice_count +
2519                                      s2->slice_context_count / 2) /
2520                                     s2->slice_context_count;
2521                     av_assert0(avctx->thread_count > 1);
2522                     if (threshold <= mb_y) {
2523                         MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2524
2525                         thread_context->start_mb_y = mb_y;
2526                         thread_context->end_mb_y   = s2->mb_height;
2527                         if (s->slice_count) {
2528                             s2->thread_context[s->slice_count-1]->end_mb_y = mb_y;
2529                             ret = ff_update_duplicate_context(thread_context,
2530                                                               s2);
2531                             if (ret < 0)
2532                                 return ret;
2533                         }
2534                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2535                         s->slice_count++;
2536                     }
2537                     buf_ptr += 2; // FIXME add minimum number of bytes per slice
2538                 } else {
2539                     ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2540                     emms_c();
2541
2542                     if (ret < 0) {
2543                         if (avctx->err_recognition & AV_EF_EXPLODE)
2544                             return ret;
2545                         if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2546                             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);
2547                     } else {
2548                         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);
2549                     }
2550                 }
2551             }
2552             break;
2553         }
2554     }
2555 }
2556
2557 static int mpeg_decode_frame(AVCodecContext *avctx,
2558                              void *data, int *got_output,
2559                              AVPacket *avpkt)
2560 {
2561     const uint8_t *buf = avpkt->data;
2562     int ret;
2563     int buf_size = avpkt->size;
2564     Mpeg1Context *s = avctx->priv_data;
2565     AVFrame *picture = data;
2566     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2567     av_dlog(avctx, "fill_buffer\n");
2568
2569     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2570         /* special case for last picture */
2571         if (s2->low_delay == 0 && s2->next_picture_ptr) {
2572             int ret = av_frame_ref(picture, &s2->next_picture_ptr->f);
2573             if (ret < 0)
2574                 return ret;
2575
2576             s2->next_picture_ptr = NULL;
2577
2578             *got_output = 1;
2579         }
2580         return buf_size;
2581     }
2582
2583     if (s2->flags & CODEC_FLAG_TRUNCATED) {
2584         int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2585
2586         if (ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0)
2587             return buf_size;
2588     }
2589
2590     s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2591     if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2592                                            || s2->codec_tag == AV_RL32("BW10")
2593                                           ))
2594         vcr2_init_sequence(avctx);
2595
2596     s->slice_count = 0;
2597
2598     if (avctx->extradata && !s->extradata_decoded) {
2599         ret = decode_chunks(avctx, picture, got_output, avctx->extradata, avctx->extradata_size);
2600         if(*got_output) {
2601             av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2602             *got_output = 0;
2603         }
2604         s->extradata_decoded = 1;
2605         if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2606             s2->current_picture_ptr = NULL;
2607             return ret;
2608         }
2609     }
2610
2611     ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2612     if (ret<0 || *got_output)
2613         s2->current_picture_ptr = NULL;
2614
2615     return ret;
2616 }
2617
2618
2619 static void flush(AVCodecContext *avctx)
2620 {
2621     Mpeg1Context *s = avctx->priv_data;
2622
2623     s->sync=0;
2624
2625     ff_mpeg_flush(avctx);
2626 }
2627
2628 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2629 {
2630     Mpeg1Context *s = avctx->priv_data;
2631
2632     if (s->mpeg_enc_ctx_allocated)
2633         ff_MPV_common_end(&s->mpeg_enc_ctx);
2634     av_freep(&s->a53_caption);
2635     return 0;
2636 }
2637
2638 static const AVProfile mpeg2_video_profiles[] = {
2639     { FF_PROFILE_MPEG2_422,          "4:2:2"              },
2640     { FF_PROFILE_MPEG2_HIGH,         "High"               },
2641     { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
2642     { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
2643     { FF_PROFILE_MPEG2_MAIN,         "Main"               },
2644     { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
2645     { FF_PROFILE_RESERVED,           "Reserved"           },
2646     { FF_PROFILE_RESERVED,           "Reserved"           },
2647     { FF_PROFILE_UNKNOWN },
2648 };
2649
2650
2651 AVCodec ff_mpeg1video_decoder = {
2652     .name                  = "mpeg1video",
2653     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2654     .type                  = AVMEDIA_TYPE_VIDEO,
2655     .id                    = AV_CODEC_ID_MPEG1VIDEO,
2656     .priv_data_size        = sizeof(Mpeg1Context),
2657     .init                  = mpeg_decode_init,
2658     .close                 = mpeg_decode_end,
2659     .decode                = mpeg_decode_frame,
2660     .capabilities          = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2661                              CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2662                              CODEC_CAP_SLICE_THREADS,
2663     .flush                 = flush,
2664     .max_lowres            = 3,
2665     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2666 };
2667
2668 AVCodec ff_mpeg2video_decoder = {
2669     .name           = "mpeg2video",
2670     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2671     .type           = AVMEDIA_TYPE_VIDEO,
2672     .id             = AV_CODEC_ID_MPEG2VIDEO,
2673     .priv_data_size = sizeof(Mpeg1Context),
2674     .init           = mpeg_decode_init,
2675     .close          = mpeg_decode_end,
2676     .decode         = mpeg_decode_frame,
2677     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2678                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2679                       CODEC_CAP_SLICE_THREADS,
2680     .flush          = flush,
2681     .max_lowres     = 3,
2682     .profiles       = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2683 };
2684
2685 //legacy decoder
2686 AVCodec ff_mpegvideo_decoder = {
2687     .name           = "mpegvideo",
2688     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2689     .type           = AVMEDIA_TYPE_VIDEO,
2690     .id             = AV_CODEC_ID_MPEG2VIDEO,
2691     .priv_data_size = sizeof(Mpeg1Context),
2692     .init           = mpeg_decode_init,
2693     .close          = mpeg_decode_end,
2694     .decode         = mpeg_decode_frame,
2695     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2696     .flush          = flush,
2697     .max_lowres     = 3,
2698 };
2699
2700 #if FF_API_XVMC
2701 #if CONFIG_MPEG_XVMC_DECODER
2702 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2703 {
2704     if (avctx->active_thread_type & FF_THREAD_SLICE)
2705         return -1;
2706     if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2707         return -1;
2708     if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2709         av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2710     }
2711     mpeg_decode_init(avctx);
2712
2713     avctx->pix_fmt           = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2714     avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2715
2716     return 0;
2717 }
2718
2719 AVCodec ff_mpeg_xvmc_decoder = {
2720     .name           = "mpegvideo_xvmc",
2721     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
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 };
2732
2733 #endif
2734 #endif /* FF_API_XVMC */
2735
2736 #if CONFIG_MPEG_VDPAU_DECODER
2737 AVCodec ff_mpeg_vdpau_decoder = {
2738     .name           = "mpegvideo_vdpau",
2739     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2740     .type           = AVMEDIA_TYPE_VIDEO,
2741     .id             = AV_CODEC_ID_MPEG2VIDEO,
2742     .priv_data_size = sizeof(Mpeg1Context),
2743     .init           = mpeg_decode_init,
2744     .close          = mpeg_decode_end,
2745     .decode         = mpeg_decode_frame,
2746     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2747                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2748     .flush          = flush,
2749 };
2750 #endif
2751
2752 #if CONFIG_MPEG1_VDPAU_DECODER
2753 AVCodec ff_mpeg1_vdpau_decoder = {
2754     .name           = "mpeg1video_vdpau",
2755     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2756     .type           = AVMEDIA_TYPE_VIDEO,
2757     .id             = AV_CODEC_ID_MPEG1VIDEO,
2758     .priv_data_size = sizeof(Mpeg1Context),
2759     .init           = mpeg_decode_init,
2760     .close          = mpeg_decode_end,
2761     .decode         = mpeg_decode_frame,
2762     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2763                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2764     .flush          = flush,
2765 };
2766 #endif