]> git.sesse.net Git - ffmpeg/blob - libavcodec/mpeg12dec.c
Merge commit 'e89247debd5276d57ce4a26516224204f9541af0'
[ffmpeg] / libavcodec / mpeg12dec.c
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 extradata_decoded;
57 } Mpeg1Context;
58
59 #define MB_TYPE_ZERO_MV   0x20000000
60
61 static const uint32_t ptype2mb_type[7] = {
62                     MB_TYPE_INTRA,
63                     MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
64                     MB_TYPE_L0,
65                     MB_TYPE_L0 | MB_TYPE_CBP,
66     MB_TYPE_QUANT | MB_TYPE_INTRA,
67     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
68     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
69 };
70
71 static const uint32_t btype2mb_type[11] = {
72                     MB_TYPE_INTRA,
73                     MB_TYPE_L1,
74                     MB_TYPE_L1   | MB_TYPE_CBP,
75                     MB_TYPE_L0,
76                     MB_TYPE_L0   | MB_TYPE_CBP,
77                     MB_TYPE_L0L1,
78                     MB_TYPE_L0L1 | MB_TYPE_CBP,
79     MB_TYPE_QUANT | MB_TYPE_INTRA,
80     MB_TYPE_QUANT | MB_TYPE_L1   | MB_TYPE_CBP,
81     MB_TYPE_QUANT | MB_TYPE_L0   | MB_TYPE_CBP,
82     MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
83 };
84
85 static const uint8_t non_linear_qscale[32] = {
86     0, 1, 2, 3, 4, 5, 6, 7,
87     8,10,12,14,16,18,20,22,
88     24,28,32,36,40,44,48,52,
89     56,64,72,80,88,96,104,112,
90 };
91
92 /* as H.263, but only 17 codes */
93 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
94 {
95     int code, sign, val, shift;
96
97     code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
98     if (code == 0) {
99         return pred;
100     }
101     if (code < 0) {
102         return 0xffff;
103     }
104
105     sign  = get_bits1(&s->gb);
106     shift = fcode - 1;
107     val   = code;
108     if (shift) {
109         val  = (val - 1) << shift;
110         val |= get_bits(&s->gb, shift);
111         val++;
112     }
113     if (sign)
114         val = -val;
115     val += pred;
116
117     /* modulo decoding */
118     return sign_extend(val, 5 + shift);
119 }
120
121 static inline int mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
122 {
123     int level, dc, diff, i, j, run;
124     int component;
125     RLTable *rl = &ff_rl_mpeg1;
126     uint8_t * const scantable    = s->intra_scantable.permutated;
127     const uint16_t *quant_matrix = s->intra_matrix;
128     const int qscale             = s->qscale;
129
130     /* DC coefficient */
131     component = (n <= 3 ? 0 : n - 4 + 1);
132     diff = decode_dc(&s->gb, component);
133     if (diff >= 0xffff)
134         return -1;
135     dc  = s->last_dc[component];
136     dc += diff;
137     s->last_dc[component] = dc;
138     block[0] = dc * quant_matrix[0];
139     av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
140     i = 0;
141     {
142         OPEN_READER(re, &s->gb);
143         /* now quantify & encode AC coefficients */
144         for (;;) {
145             UPDATE_CACHE(re, &s->gb);
146             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
147
148             if (level == 127) {
149                 break;
150             } else if (level != 0) {
151                 i += run;
152                 j = scantable[i];
153                 level = (level * qscale * quant_matrix[j]) >> 4;
154                 level = (level - 1) | 1;
155                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
156                 LAST_SKIP_BITS(re, &s->gb, 1);
157             } else {
158                 /* escape */
159                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
160                 UPDATE_CACHE(re, &s->gb);
161                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
162                 if (level == -128) {
163                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
164                 } else if (level == 0) {
165                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
166                 }
167                 i += run;
168                 j = scantable[i];
169                 if (level < 0) {
170                     level = -level;
171                     level = (level * qscale * quant_matrix[j]) >> 4;
172                     level = (level - 1) | 1;
173                     level = -level;
174                 } else {
175                     level = (level * qscale * quant_matrix[j]) >> 4;
176                     level = (level - 1) | 1;
177                 }
178             }
179             if (i > 63) {
180                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
181                 return -1;
182             }
183
184             block[j] = level;
185         }
186         CLOSE_READER(re, &s->gb);
187     }
188     s->block_last_index[n] = i;
189    return 0;
190 }
191
192 int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
193 {
194     return mpeg1_decode_block_intra(s, block, n);
195 }
196
197 static inline int mpeg1_decode_block_inter(MpegEncContext *s, int16_t *block, int n)
198 {
199     int level, i, j, run;
200     RLTable *rl = &ff_rl_mpeg1;
201     uint8_t * const scantable    = s->intra_scantable.permutated;
202     const uint16_t *quant_matrix = s->inter_matrix;
203     const int qscale             = s->qscale;
204
205     {
206         OPEN_READER(re, &s->gb);
207         i = -1;
208         // special case for first coefficient, no need to add second VLC table
209         UPDATE_CACHE(re, &s->gb);
210         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
211             level = (3 * qscale * quant_matrix[0]) >> 5;
212             level = (level - 1) | 1;
213             if (GET_CACHE(re, &s->gb) & 0x40000000)
214                 level = -level;
215             block[0] = level;
216             i++;
217             SKIP_BITS(re, &s->gb, 2);
218             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
219                 goto end;
220         }
221         /* now quantify & encode AC coefficients */
222         for (;;) {
223             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
224
225             if (level != 0) {
226                 i += run;
227                 j = scantable[i];
228                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
229                 level = (level - 1) | 1;
230                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
231                 SKIP_BITS(re, &s->gb, 1);
232             } else {
233                 /* escape */
234                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
235                 UPDATE_CACHE(re, &s->gb);
236                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
237                 if (level == -128) {
238                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
239                 } else if (level == 0) {
240                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
241                 }
242                 i += run;
243                 j = scantable[i];
244                 if (level < 0) {
245                     level = -level;
246                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
247                     level = (level - 1) | 1;
248                     level = -level;
249                 } else {
250                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
251                     level = (level - 1) | 1;
252                 }
253             }
254             if (i > 63) {
255                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
256                 return -1;
257             }
258
259             block[j] = level;
260             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
261                 break;
262             UPDATE_CACHE(re, &s->gb);
263         }
264 end:
265         LAST_SKIP_BITS(re, &s->gb, 2);
266         CLOSE_READER(re, &s->gb);
267     }
268     s->block_last_index[n] = i;
269     return 0;
270 }
271
272 /**
273  * Note: this function can read out of range and crash for corrupt streams.
274  * Changing this would eat up any speed benefits it has.
275  * Do not use "fast" flag if you need the code to be robust.
276  */
277 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, int16_t *block, int n)
278 {
279     int level, i, j, run;
280     RLTable *rl = &ff_rl_mpeg1;
281     uint8_t * const scantable = s->intra_scantable.permutated;
282     const int qscale          = s->qscale;
283
284     {
285         OPEN_READER(re, &s->gb);
286         i = -1;
287         // special case for first coefficient, no need to add second VLC table
288         UPDATE_CACHE(re, &s->gb);
289         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
290             level = (3 * qscale) >> 1;
291             level = (level - 1) | 1;
292             if (GET_CACHE(re, &s->gb) & 0x40000000)
293                 level = -level;
294             block[0] = level;
295             i++;
296             SKIP_BITS(re, &s->gb, 2);
297             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
298                 goto end;
299         }
300
301         /* now quantify & encode AC coefficients */
302         for (;;) {
303             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
304
305             if (level != 0) {
306                 i += run;
307                 j = scantable[i];
308                 level = ((level * 2 + 1) * qscale) >> 1;
309                 level = (level - 1) | 1;
310                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
311                 SKIP_BITS(re, &s->gb, 1);
312             } else {
313                 /* escape */
314                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
315                 UPDATE_CACHE(re, &s->gb);
316                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
317                 if (level == -128) {
318                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
319                 } else if (level == 0) {
320                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
321                 }
322                 i += run;
323                 j = scantable[i];
324                 if (level < 0) {
325                     level = -level;
326                     level = ((level * 2 + 1) * qscale) >> 1;
327                     level = (level - 1) | 1;
328                     level = -level;
329                 } else {
330                     level = ((level * 2 + 1) * qscale) >> 1;
331                     level = (level - 1) | 1;
332                 }
333             }
334
335             block[j] = level;
336             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
337                 break;
338             UPDATE_CACHE(re, &s->gb);
339         }
340 end:
341         LAST_SKIP_BITS(re, &s->gb, 2);
342         CLOSE_READER(re, &s->gb);
343     }
344     s->block_last_index[n] = i;
345     return 0;
346 }
347
348
349 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, int16_t *block, int n)
350 {
351     int level, i, j, run;
352     RLTable *rl = &ff_rl_mpeg1;
353     uint8_t * const scantable = s->intra_scantable.permutated;
354     const uint16_t *quant_matrix;
355     const int qscale = s->qscale;
356     int mismatch;
357
358     mismatch = 1;
359
360     {
361         OPEN_READER(re, &s->gb);
362         i = -1;
363         if (n < 4)
364             quant_matrix = s->inter_matrix;
365         else
366             quant_matrix = s->chroma_inter_matrix;
367
368         // special case for first coefficient, no need to add second VLC table
369         UPDATE_CACHE(re, &s->gb);
370         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
371             level= (3 * qscale * quant_matrix[0]) >> 5;
372             if (GET_CACHE(re, &s->gb) & 0x40000000)
373                 level = -level;
374             block[0]  = level;
375             mismatch ^= level;
376             i++;
377             SKIP_BITS(re, &s->gb, 2);
378             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
379                 goto end;
380         }
381
382         /* now quantify & encode AC coefficients */
383         for (;;) {
384             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
385
386             if (level != 0) {
387                 i += run;
388                 j = scantable[i];
389                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
390                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
391                 SKIP_BITS(re, &s->gb, 1);
392             } else {
393                 /* escape */
394                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
395                 UPDATE_CACHE(re, &s->gb);
396                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
397
398                 i += run;
399                 j = scantable[i];
400                 if (level < 0) {
401                     level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
402                     level = -level;
403                 } else {
404                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
405                 }
406             }
407             if (i > 63) {
408                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
409                 return -1;
410             }
411
412             mismatch ^= level;
413             block[j]  = level;
414             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
415                 break;
416             UPDATE_CACHE(re, &s->gb);
417         }
418 end:
419         LAST_SKIP_BITS(re, &s->gb, 2);
420         CLOSE_READER(re, &s->gb);
421     }
422     block[63] ^= (mismatch & 1);
423
424     s->block_last_index[n] = i;
425     return 0;
426 }
427
428 /**
429  * Note: this function can read out of range and crash for corrupt streams.
430  * Changing this would eat up any speed benefits it has.
431  * Do not use "fast" flag if you need the code to be robust.
432  */
433 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
434                                                     int16_t *block, int n)
435 {
436     int level, i, j, run;
437     RLTable *rl = &ff_rl_mpeg1;
438     uint8_t * const scantable = s->intra_scantable.permutated;
439     const int qscale          = s->qscale;
440     OPEN_READER(re, &s->gb);
441     i = -1;
442
443     // special case for first coefficient, no need to add second VLC table
444     UPDATE_CACHE(re, &s->gb);
445     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
446         level = (3 * qscale) >> 1;
447         if (GET_CACHE(re, &s->gb) & 0x40000000)
448             level = -level;
449         block[0] = level;
450         i++;
451         SKIP_BITS(re, &s->gb, 2);
452         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
453             goto end;
454     }
455
456     /* now quantify & encode AC coefficients */
457     for (;;) {
458         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
459
460         if (level != 0) {
461             i += run;
462             j  = scantable[i];
463             level = ((level * 2 + 1) * qscale) >> 1;
464             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
465             SKIP_BITS(re, &s->gb, 1);
466         } else {
467             /* escape */
468             run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
469             UPDATE_CACHE(re, &s->gb);
470             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
471
472             i += run;
473             j  = scantable[i];
474             if (level < 0) {
475                 level = ((-level * 2 + 1) * qscale) >> 1;
476                 level = -level;
477             } else {
478                 level = ((level * 2 + 1) * qscale) >> 1;
479             }
480         }
481
482         block[j] = level;
483         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
484             break;
485         UPDATE_CACHE(re, &s->gb);
486     }
487 end:
488     LAST_SKIP_BITS(re, &s->gb, 2);
489     CLOSE_READER(re, &s->gb);
490     s->block_last_index[n] = i;
491     return 0;
492 }
493
494
495 static inline int mpeg2_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
496 {
497     int level, dc, diff, i, j, run;
498     int component;
499     RLTable *rl;
500     uint8_t * const scantable = s->intra_scantable.permutated;
501     const uint16_t *quant_matrix;
502     const int qscale = s->qscale;
503     int mismatch;
504
505     /* DC coefficient */
506     if (n < 4) {
507         quant_matrix = s->intra_matrix;
508         component = 0;
509     } else {
510         quant_matrix = s->chroma_intra_matrix;
511         component = (n & 1) + 1;
512     }
513     diff = decode_dc(&s->gb, component);
514     if (diff >= 0xffff)
515         return -1;
516     dc  = s->last_dc[component];
517     dc += diff;
518     s->last_dc[component] = dc;
519     block[0] = dc << (3 - s->intra_dc_precision);
520     av_dlog(s->avctx, "dc=%d\n", block[0]);
521     mismatch = block[0] ^ 1;
522     i = 0;
523     if (s->intra_vlc_format)
524         rl = &ff_rl_mpeg2;
525     else
526         rl = &ff_rl_mpeg1;
527
528     {
529         OPEN_READER(re, &s->gb);
530         /* now quantify & encode AC coefficients */
531         for (;;) {
532             UPDATE_CACHE(re, &s->gb);
533             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
534
535             if (level == 127) {
536                 break;
537             } else if (level != 0) {
538                 i += run;
539                 j  = scantable[i];
540                 level = (level * qscale * quant_matrix[j]) >> 4;
541                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
542                 LAST_SKIP_BITS(re, &s->gb, 1);
543             } else {
544                 /* escape */
545                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
546                 UPDATE_CACHE(re, &s->gb);
547                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
548                 i += run;
549                 j  = scantable[i];
550                 if (level < 0) {
551                     level = (-level * qscale * quant_matrix[j]) >> 4;
552                     level = -level;
553                 } else {
554                     level = (level * qscale * quant_matrix[j]) >> 4;
555                 }
556             }
557             if (i > 63) {
558                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
559                 return -1;
560             }
561
562             mismatch ^= level;
563             block[j]  = level;
564         }
565         CLOSE_READER(re, &s->gb);
566     }
567     block[63] ^= mismatch & 1;
568
569     s->block_last_index[n] = i;
570     return 0;
571 }
572
573 /**
574  * Note: this function can read out of range and crash for corrupt streams.
575  * Changing this would eat up any speed benefits it has.
576  * Do not use "fast" flag if you need the code to be robust.
577  */
578 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
579 {
580     int level, dc, diff, j, run;
581     int component;
582     RLTable *rl;
583     uint8_t * scantable = s->intra_scantable.permutated;
584     const uint16_t *quant_matrix;
585     const int qscale = s->qscale;
586
587     /* DC coefficient */
588     if (n < 4) {
589         quant_matrix = s->intra_matrix;
590         component = 0;
591     } else {
592         quant_matrix = s->chroma_intra_matrix;
593         component = (n & 1) + 1;
594     }
595     diff = decode_dc(&s->gb, component);
596     if (diff >= 0xffff)
597         return -1;
598     dc = s->last_dc[component];
599     dc += diff;
600     s->last_dc[component] = dc;
601     block[0] = dc << (3 - s->intra_dc_precision);
602     if (s->intra_vlc_format)
603         rl = &ff_rl_mpeg2;
604     else
605         rl = &ff_rl_mpeg1;
606
607     {
608         OPEN_READER(re, &s->gb);
609         /* now quantify & encode AC coefficients */
610         for (;;) {
611             UPDATE_CACHE(re, &s->gb);
612             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
613
614             if (level == 127) {
615                 break;
616             } else if (level != 0) {
617                 scantable += run;
618                 j = *scantable;
619                 level = (level * qscale * quant_matrix[j]) >> 4;
620                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
621                 LAST_SKIP_BITS(re, &s->gb, 1);
622             } else {
623                 /* escape */
624                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
625                 UPDATE_CACHE(re, &s->gb);
626                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
627                 scantable += run;
628                 j = *scantable;
629                 if (level < 0) {
630                     level = (-level * qscale * quant_matrix[j]) >> 4;
631                     level = -level;
632                 } else {
633                     level = (level * qscale * quant_matrix[j]) >> 4;
634                 }
635             }
636
637             block[j] = level;
638         }
639         CLOSE_READER(re, &s->gb);
640     }
641
642     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
643     return 0;
644 }
645
646 /******************************************/
647 /* decoding */
648
649 static inline int get_dmv(MpegEncContext *s)
650 {
651     if (get_bits1(&s->gb))
652         return 1 - (get_bits1(&s->gb) << 1);
653     else
654         return 0;
655 }
656
657 static inline int get_qscale(MpegEncContext *s)
658 {
659     int qscale = get_bits(&s->gb, 5);
660     if (s->q_scale_type) {
661         return non_linear_qscale[qscale];
662     } else {
663         return qscale << 1;
664     }
665 }
666
667 static void exchange_uv(MpegEncContext *s)
668 {
669     int16_t (*tmp)[64];
670
671     tmp           = s->pblocks[4];
672     s->pblocks[4] = s->pblocks[5];
673     s->pblocks[5] = tmp;
674 }
675
676 /* motion type (for MPEG-2) */
677 #define MT_FIELD 1
678 #define MT_FRAME 2
679 #define MT_16X8  2
680 #define MT_DMV   3
681
682 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
683 {
684     int i, j, k, cbp, val, mb_type, motion_type;
685     const int mb_block_count = 4 + (1 << s->chroma_format);
686
687     av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
688
689     av_assert2(s->mb_skipped == 0);
690
691     if (s->mb_skip_run-- != 0) {
692         if (s->pict_type == AV_PICTURE_TYPE_P) {
693             s->mb_skipped = 1;
694             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
695         } else {
696             int mb_type;
697
698             if (s->mb_x)
699                 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
700             else
701                 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
702             if (IS_INTRA(mb_type)) {
703                 av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
704                 return -1;
705             }
706             s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride] =
707                 mb_type | MB_TYPE_SKIP;
708
709             if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
710                 s->mb_skipped = 1;
711         }
712
713         return 0;
714     }
715
716     switch (s->pict_type) {
717     default:
718     case AV_PICTURE_TYPE_I:
719         if (get_bits1(&s->gb) == 0) {
720             if (get_bits1(&s->gb) == 0) {
721                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
722                 return -1;
723             }
724             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
725         } else {
726             mb_type = MB_TYPE_INTRA;
727         }
728         break;
729     case AV_PICTURE_TYPE_P:
730         mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
731         if (mb_type < 0) {
732             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
733             return -1;
734         }
735         mb_type = ptype2mb_type[mb_type];
736         break;
737     case AV_PICTURE_TYPE_B:
738         mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
739         if (mb_type < 0) {
740             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
741             return -1;
742         }
743         mb_type = btype2mb_type[mb_type];
744         break;
745     }
746     av_dlog(s->avctx, "mb_type=%x\n", mb_type);
747 //    motion_type = 0; /* avoid warning */
748     if (IS_INTRA(mb_type)) {
749         s->dsp.clear_blocks(s->block[0]);
750
751         if (!s->chroma_y_shift) {
752             s->dsp.clear_blocks(s->block[6]);
753         }
754
755         /* compute DCT type */
756         if (s->picture_structure == PICT_FRAME && // FIXME add an interlaced_dct coded var?
757             !s->frame_pred_frame_dct) {
758             s->interlaced_dct = get_bits1(&s->gb);
759         }
760
761         if (IS_QUANT(mb_type))
762             s->qscale = get_qscale(s);
763
764         if (s->concealment_motion_vectors) {
765             /* just parse them */
766             if (s->picture_structure != PICT_FRAME)
767                 skip_bits1(&s->gb); /* field select */
768
769             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
770                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
771             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
772                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
773
774             skip_bits1(&s->gb); /* marker */
775         } else
776             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
777         s->mb_intra = 1;
778 #if FF_API_XVMC
779 FF_DISABLE_DEPRECATION_WARNINGS
780         // if 1, we memcpy blocks in xvmcvideo
781         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
782             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
783             if (s->swap_uv) {
784                 exchange_uv(s);
785             }
786         }
787 FF_ENABLE_DEPRECATION_WARNINGS
788 #endif /* FF_API_XVMC */
789
790         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
791             if (s->flags2 & CODEC_FLAG2_FAST) {
792                 for (i = 0; i < 6; i++) {
793                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
794                 }
795             } else {
796                 for (i = 0; i < mb_block_count; i++) {
797                     if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
798                         return -1;
799                 }
800             }
801         } else {
802             for (i = 0; i < 6; i++) {
803                 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
804                     return -1;
805             }
806         }
807     } else {
808         if (mb_type & MB_TYPE_ZERO_MV) {
809             av_assert2(mb_type & MB_TYPE_CBP);
810
811             s->mv_dir = MV_DIR_FORWARD;
812             if (s->picture_structure == PICT_FRAME) {
813                 if (s->picture_structure == PICT_FRAME
814                     && !s->frame_pred_frame_dct)
815                     s->interlaced_dct = get_bits1(&s->gb);
816                 s->mv_type = MV_TYPE_16X16;
817             } else {
818                 s->mv_type = MV_TYPE_FIELD;
819                 mb_type |= MB_TYPE_INTERLACED;
820                 s->field_select[0][0] = s->picture_structure - 1;
821             }
822
823             if (IS_QUANT(mb_type))
824                 s->qscale = get_qscale(s);
825
826             s->last_mv[0][0][0] = 0;
827             s->last_mv[0][0][1] = 0;
828             s->last_mv[0][1][0] = 0;
829             s->last_mv[0][1][1] = 0;
830             s->mv[0][0][0] = 0;
831             s->mv[0][0][1] = 0;
832         } else {
833             av_assert2(mb_type & MB_TYPE_L0L1);
834             // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
835             /* get additional motion vector type */
836             if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct)
837                 motion_type = MT_FRAME;
838             else {
839                 motion_type = get_bits(&s->gb, 2);
840                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
841                     s->interlaced_dct = get_bits1(&s->gb);
842             }
843
844             if (IS_QUANT(mb_type))
845                 s->qscale = get_qscale(s);
846
847             /* motion vectors */
848             s->mv_dir = (mb_type >> 13) & 3;
849             av_dlog(s->avctx, "motion_type=%d\n", motion_type);
850             switch (motion_type) {
851             case MT_FRAME: /* or MT_16X8 */
852                 if (s->picture_structure == PICT_FRAME) {
853                     mb_type |= MB_TYPE_16x16;
854                     s->mv_type = MV_TYPE_16X16;
855                     for (i = 0; i < 2; i++) {
856                         if (USES_LIST(mb_type, i)) {
857                             /* MT_FRAME */
858                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
859                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
860                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
861                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
862                             /* full_pel: only for MPEG-1 */
863                             if (s->full_pel[i]) {
864                                 s->mv[i][0][0] <<= 1;
865                                 s->mv[i][0][1] <<= 1;
866                             }
867                         }
868                     }
869                 } else {
870                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
871                     s->mv_type = MV_TYPE_16X8;
872                     for (i = 0; i < 2; i++) {
873                         if (USES_LIST(mb_type, i)) {
874                             /* MT_16X8 */
875                             for (j = 0; j < 2; j++) {
876                                 s->field_select[i][j] = get_bits1(&s->gb);
877                                 for (k = 0; k < 2; k++) {
878                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
879                                                              s->last_mv[i][j][k]);
880                                     s->last_mv[i][j][k] = val;
881                                     s->mv[i][j][k]      = val;
882                                 }
883                             }
884                         }
885                     }
886                 }
887                 break;
888             case MT_FIELD:
889                 s->mv_type = MV_TYPE_FIELD;
890                 if (s->picture_structure == PICT_FRAME) {
891                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
892                     for (i = 0; i < 2; i++) {
893                         if (USES_LIST(mb_type, i)) {
894                             for (j = 0; j < 2; j++) {
895                                 s->field_select[i][j] = get_bits1(&s->gb);
896                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
897                                                          s->last_mv[i][j][0]);
898                                 s->last_mv[i][j][0] = val;
899                                 s->mv[i][j][0]      = val;
900                                 av_dlog(s->avctx, "fmx=%d\n", val);
901                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
902                                                          s->last_mv[i][j][1] >> 1);
903                                 s->last_mv[i][j][1] = val << 1;
904                                 s->mv[i][j][1]      = val;
905                                 av_dlog(s->avctx, "fmy=%d\n", val);
906                             }
907                         }
908                     }
909                 } else {
910                     av_assert0(!s->progressive_sequence);
911                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
912                     for (i = 0; i < 2; i++) {
913                         if (USES_LIST(mb_type, i)) {
914                             s->field_select[i][0] = get_bits1(&s->gb);
915                             for (k = 0; k < 2; k++) {
916                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
917                                                          s->last_mv[i][0][k]);
918                                 s->last_mv[i][0][k] = val;
919                                 s->last_mv[i][1][k] = val;
920                                 s->mv[i][0][k]      = val;
921                             }
922                         }
923                     }
924                 }
925                 break;
926             case MT_DMV:
927                 if(s->progressive_sequence){
928                     av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
929                     return -1;
930                 }
931                 s->mv_type = MV_TYPE_DMV;
932                 for (i = 0; i < 2; i++) {
933                     if (USES_LIST(mb_type, i)) {
934                         int dmx, dmy, mx, my, m;
935                         const int my_shift = s->picture_structure == PICT_FRAME;
936
937                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
938                                                 s->last_mv[i][0][0]);
939                         s->last_mv[i][0][0] = mx;
940                         s->last_mv[i][1][0] = mx;
941                         dmx = get_dmv(s);
942                         my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
943                                                  s->last_mv[i][0][1] >> my_shift);
944                         dmy = get_dmv(s);
945
946
947                         s->last_mv[i][0][1] = my << my_shift;
948                         s->last_mv[i][1][1] = my << my_shift;
949
950                         s->mv[i][0][0] = mx;
951                         s->mv[i][0][1] = my;
952                         s->mv[i][1][0] = mx; // not used
953                         s->mv[i][1][1] = my; // not used
954
955                         if (s->picture_structure == PICT_FRAME) {
956                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
957
958                             // m = 1 + 2 * s->top_field_first;
959                             m = s->top_field_first ? 1 : 3;
960
961                             /* top -> top pred */
962                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
963                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
964                             m = 4 - m;
965                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
966                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
967                         } else {
968                             mb_type |= MB_TYPE_16x16;
969
970                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
971                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
972                             if (s->picture_structure == PICT_TOP_FIELD)
973                                 s->mv[i][2][1]--;
974                             else
975                                 s->mv[i][2][1]++;
976                         }
977                     }
978                 }
979                 break;
980             default:
981                 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
982                 return -1;
983             }
984         }
985
986         s->mb_intra = 0;
987         if (HAS_CBP(mb_type)) {
988             s->dsp.clear_blocks(s->block[0]);
989
990             cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
991             if (mb_block_count > 6) {
992                  cbp <<= mb_block_count - 6;
993                  cbp  |= get_bits(&s->gb, mb_block_count - 6);
994                  s->dsp.clear_blocks(s->block[6]);
995             }
996             if (cbp <= 0) {
997                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
998                 return -1;
999             }
1000
1001 #if FF_API_XVMC
1002 FF_DISABLE_DEPRECATION_WARNINGS
1003             //if 1, we memcpy blocks in xvmcvideo
1004             if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
1005                 ff_xvmc_pack_pblocks(s, cbp);
1006                 if (s->swap_uv) {
1007                     exchange_uv(s);
1008                 }
1009             }
1010 FF_ENABLE_DEPRECATION_WARNINGS
1011 #endif /* FF_API_XVMC */
1012
1013             if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1014                 if (s->flags2 & CODEC_FLAG2_FAST) {
1015                     for (i = 0; i < 6; i++) {
1016                         if (cbp & 32) {
1017                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1018                         } else {
1019                             s->block_last_index[i] = -1;
1020                         }
1021                         cbp += cbp;
1022                     }
1023                 } else {
1024                     cbp <<= 12-mb_block_count;
1025
1026                     for (i = 0; i < mb_block_count; i++) {
1027                         if (cbp & (1 << 11)) {
1028                             if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
1029                                 return -1;
1030                         } else {
1031                             s->block_last_index[i] = -1;
1032                         }
1033                         cbp += cbp;
1034                     }
1035                 }
1036             } else {
1037                 if (s->flags2 & CODEC_FLAG2_FAST) {
1038                     for (i = 0; i < 6; i++) {
1039                         if (cbp & 32) {
1040                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1041                         } else {
1042                             s->block_last_index[i] = -1;
1043                         }
1044                         cbp += cbp;
1045                     }
1046                 } else {
1047                     for (i = 0; i < 6; i++) {
1048                         if (cbp & 32) {
1049                             if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
1050                                 return -1;
1051                         } else {
1052                             s->block_last_index[i] = -1;
1053                         }
1054                         cbp += cbp;
1055                     }
1056                 }
1057             }
1058         } else {
1059             for (i = 0; i < 12; i++)
1060                 s->block_last_index[i] = -1;
1061         }
1062     }
1063
1064     s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1065
1066     return 0;
1067 }
1068
1069 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1070 {
1071     Mpeg1Context *s = avctx->priv_data;
1072     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1073     int i;
1074
1075     /* we need some permutation to store matrices,
1076      * until MPV_common_init() sets the real permutation. */
1077     for (i = 0; i < 64; i++)
1078        s2->dsp.idct_permutation[i]=i;
1079
1080     ff_MPV_decode_defaults(s2);
1081
1082     s->mpeg_enc_ctx.avctx  = avctx;
1083     s->mpeg_enc_ctx.flags  = avctx->flags;
1084     s->mpeg_enc_ctx.flags2 = avctx->flags2;
1085     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1086     ff_mpeg12_init_vlcs();
1087
1088     s->mpeg_enc_ctx_allocated      = 0;
1089     s->mpeg_enc_ctx.picture_number = 0;
1090     s->repeat_field                = 0;
1091     s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1092     avctx->color_range = AVCOL_RANGE_MPEG;
1093     if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1094         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1095     else
1096         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1097     return 0;
1098 }
1099
1100 static int mpeg_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
1101 {
1102     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1103     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1104     int err;
1105
1106     if (avctx == avctx_from || !ctx_from->mpeg_enc_ctx_allocated || !s1->context_initialized)
1107         return 0;
1108
1109     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1110     if (err) return err;
1111
1112     if (!ctx->mpeg_enc_ctx_allocated)
1113         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1114
1115     if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1116         s->picture_number++;
1117
1118     return 0;
1119 }
1120
1121 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1122                                  const uint8_t *new_perm)
1123 {
1124     uint16_t temp_matrix[64];
1125     int i;
1126
1127     memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1128
1129     for (i = 0; i < 64; i++) {
1130         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1131     }
1132 }
1133
1134 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1135 #if FF_API_XVMC
1136 #if CONFIG_MPEG_XVMC_DECODER
1137     AV_PIX_FMT_XVMC_MPEG2_IDCT,
1138     AV_PIX_FMT_XVMC_MPEG2_MC,
1139 #endif
1140 #endif /* FF_API_XVMC */
1141 #if CONFIG_MPEG1_VDPAU_HWACCEL
1142     AV_PIX_FMT_VDPAU_MPEG1,
1143     AV_PIX_FMT_VDPAU,
1144 #endif
1145     AV_PIX_FMT_YUV420P,
1146     AV_PIX_FMT_NONE
1147 };
1148
1149 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1150 #if FF_API_XVMC
1151 #if CONFIG_MPEG_XVMC_DECODER
1152     AV_PIX_FMT_XVMC_MPEG2_IDCT,
1153     AV_PIX_FMT_XVMC_MPEG2_MC,
1154 #endif
1155 #endif /* FF_API_XVMC */
1156 #if CONFIG_MPEG2_VDPAU_HWACCEL
1157     AV_PIX_FMT_VDPAU_MPEG2,
1158     AV_PIX_FMT_VDPAU,
1159 #endif
1160 #if CONFIG_MPEG2_DXVA2_HWACCEL
1161     AV_PIX_FMT_DXVA2_VLD,
1162 #endif
1163 #if CONFIG_MPEG2_VAAPI_HWACCEL
1164     AV_PIX_FMT_VAAPI_VLD,
1165 #endif
1166     AV_PIX_FMT_YUV420P,
1167     AV_PIX_FMT_NONE
1168 };
1169
1170 static inline int uses_vdpau(AVCodecContext *avctx) {
1171     return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1172 }
1173
1174 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1175 {
1176     Mpeg1Context *s1 = avctx->priv_data;
1177     MpegEncContext *s = &s1->mpeg_enc_ctx;
1178
1179     if(s->chroma_format < 2) {
1180         return ff_thread_get_format(avctx,
1181                                 avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1182                                 mpeg1_hwaccel_pixfmt_list_420 :
1183                                 mpeg2_hwaccel_pixfmt_list_420);
1184     } else if(s->chroma_format == 2)
1185         return AV_PIX_FMT_YUV422P;
1186     else
1187         return AV_PIX_FMT_YUV444P;
1188 }
1189
1190 static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1191 {
1192 #if FF_API_XVMC
1193 FF_DISABLE_DEPRECATION_WARNINGS
1194     if (avctx->pix_fmt != AV_PIX_FMT_XVMC_MPEG2_IDCT && avctx->pix_fmt != AV_PIX_FMT_XVMC_MPEG2_MC) {
1195         avctx->xvmc_acceleration = 0;
1196     } else if (!avctx->xvmc_acceleration) {
1197         avctx->xvmc_acceleration = 2;
1198     }
1199 FF_ENABLE_DEPRECATION_WARNINGS
1200 #endif /* FF_API_XVMC */
1201     avctx->hwaccel = ff_find_hwaccel(avctx);
1202     // until then pix_fmt may be changed right after codec init
1203 #if FF_API_XVMC
1204     if (avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT ||
1205 #else
1206     if (
1207 #endif
1208         avctx->hwaccel || uses_vdpau(avctx))
1209         if (avctx->idct_algo == FF_IDCT_AUTO)
1210             avctx->idct_algo = FF_IDCT_SIMPLE;
1211 }
1212
1213 /* Call this function when we know all parameters.
1214  * It may be called in different places for MPEG-1 and MPEG-2. */
1215 static int mpeg_decode_postinit(AVCodecContext *avctx)
1216 {
1217     Mpeg1Context *s1 = avctx->priv_data;
1218     MpegEncContext *s = &s1->mpeg_enc_ctx;
1219     uint8_t old_permutation[64];
1220     int ret;
1221
1222     if ((s1->mpeg_enc_ctx_allocated == 0) ||
1223         avctx->coded_width  != s->width   ||
1224         avctx->coded_height != s->height  ||
1225         s1->save_width           != s->width                ||
1226         s1->save_height          != s->height               ||
1227         s1->save_aspect_info     != s->aspect_ratio_info    ||
1228         (s1->save_progressive_seq != s->progressive_sequence && (s->height&31)) ||
1229         0)
1230     {
1231
1232         if (s1->mpeg_enc_ctx_allocated) {
1233             ParseContext pc = s->parse_context;
1234             s->parse_context.buffer = 0;
1235             ff_MPV_common_end(s);
1236             s->parse_context = pc;
1237             s1->mpeg_enc_ctx_allocated = 0;
1238         }
1239
1240         if ((s->width == 0) || (s->height == 0))
1241             return -2;
1242
1243         ret = ff_set_dimensions(avctx, s->width, s->height);
1244         if (ret < 0)
1245             return ret;
1246
1247         if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1248             avctx->rc_max_rate = s->bit_rate;
1249         } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1250                    (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1251             avctx->bit_rate = s->bit_rate;
1252         }
1253         s1->save_aspect_info     = s->aspect_ratio_info;
1254         s1->save_width           = s->width;
1255         s1->save_height          = s->height;
1256         s1->save_progressive_seq = s->progressive_sequence;
1257
1258         /* low_delay may be forced, in this case we will have B-frames
1259          * that behave like P-frames. */
1260         avctx->has_b_frames = !s->low_delay;
1261
1262         if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1263             //MPEG-1 fps
1264             avctx->time_base.den = ff_mpeg12_frame_rate_tab[s->frame_rate_index].num;
1265             avctx->time_base.num = ff_mpeg12_frame_rate_tab[s->frame_rate_index].den;
1266             //MPEG-1 aspect
1267             avctx->sample_aspect_ratio = av_d2q(1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1268             avctx->ticks_per_frame=1;
1269         } else {//MPEG-2
1270         //MPEG-2 fps
1271             av_reduce(&s->avctx->time_base.den,
1272                       &s->avctx->time_base.num,
1273                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1274                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1275                       1 << 30);
1276             avctx->ticks_per_frame = 2;
1277             //MPEG-2 aspect
1278             if (s->aspect_ratio_info > 1) {
1279                 AVRational dar =
1280                     av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1281                                       (AVRational) {s1->pan_scan.width, s1->pan_scan.height}),
1282                              (AVRational) {s->width, s->height});
1283
1284                 // we ignore the spec here and guess a bit as reality does not match the spec, see for example
1285                 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1286                 // issue1613, 621, 562
1287                 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1288                    (av_cmp_q(dar, (AVRational) {4, 3}) && av_cmp_q(dar, (AVRational) {16, 9}))) {
1289                     s->avctx->sample_aspect_ratio =
1290                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1291                                  (AVRational) {s->width, s->height});
1292                 } else {
1293                     s->avctx->sample_aspect_ratio =
1294                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1295                                  (AVRational) {s1->pan_scan.width, s1->pan_scan.height});
1296 //issue1613 4/3 16/9 -> 16/9
1297 //res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1298 //widescreen-issue562.mpg 4/3 16/9 -> 16/9
1299 //                    s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1300                     av_dlog(avctx, "A %d/%d\n",
1301                             ff_mpeg2_aspect[s->aspect_ratio_info].num, ff_mpeg2_aspect[s->aspect_ratio_info].den);
1302                     av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1303                             s->avctx->sample_aspect_ratio.den);
1304                 }
1305             } else {
1306                 s->avctx->sample_aspect_ratio =
1307                     ff_mpeg2_aspect[s->aspect_ratio_info];
1308             }
1309         } // MPEG-2
1310
1311         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1312         setup_hwaccel_for_pixfmt(avctx);
1313
1314         /* Quantization matrices may need reordering
1315          * if DCT permutation is changed. */
1316         memcpy(old_permutation, s->dsp.idct_permutation, 64 * sizeof(uint8_t));
1317
1318         if (ff_MPV_common_init(s) < 0)
1319             return -2;
1320
1321         quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->dsp.idct_permutation);
1322         quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->dsp.idct_permutation);
1323         quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->dsp.idct_permutation);
1324         quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->dsp.idct_permutation);
1325
1326         s1->mpeg_enc_ctx_allocated = 1;
1327     }
1328     return 0;
1329 }
1330
1331 static int mpeg1_decode_picture(AVCodecContext *avctx,
1332                                 const uint8_t *buf, int buf_size)
1333 {
1334     Mpeg1Context *s1 = avctx->priv_data;
1335     MpegEncContext *s = &s1->mpeg_enc_ctx;
1336     int ref, f_code, vbv_delay;
1337
1338     init_get_bits(&s->gb, buf, buf_size*8);
1339
1340     ref = get_bits(&s->gb, 10); /* temporal ref */
1341     s->pict_type = get_bits(&s->gb, 3);
1342     if (s->pict_type == 0 || s->pict_type > 3)
1343         return -1;
1344
1345     vbv_delay = get_bits(&s->gb, 16);
1346     s->vbv_delay = vbv_delay;
1347     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
1348         s->full_pel[0] = get_bits1(&s->gb);
1349         f_code = get_bits(&s->gb, 3);
1350         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1351             return -1;
1352         f_code += !f_code;
1353         s->mpeg_f_code[0][0] = f_code;
1354         s->mpeg_f_code[0][1] = f_code;
1355     }
1356     if (s->pict_type == AV_PICTURE_TYPE_B) {
1357         s->full_pel[1] = get_bits1(&s->gb);
1358         f_code = get_bits(&s->gb, 3);
1359         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1360             return -1;
1361         f_code += !f_code;
1362         s->mpeg_f_code[1][0] = f_code;
1363         s->mpeg_f_code[1][1] = f_code;
1364     }
1365     s->current_picture.f.pict_type = s->pict_type;
1366     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1367
1368     if (avctx->debug & FF_DEBUG_PICT_INFO)
1369         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1370
1371     s->y_dc_scale = 8;
1372     s->c_dc_scale = 8;
1373     return 0;
1374 }
1375
1376 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1377 {
1378     MpegEncContext *s= &s1->mpeg_enc_ctx;
1379     int horiz_size_ext, vert_size_ext;
1380     int bit_rate_ext;
1381
1382     skip_bits(&s->gb, 1); /* profile and level esc*/
1383     s->avctx->profile       = get_bits(&s->gb, 3);
1384     s->avctx->level         = get_bits(&s->gb, 4);
1385     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1386     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1387     horiz_size_ext          = get_bits(&s->gb, 2);
1388     vert_size_ext           = get_bits(&s->gb, 2);
1389     s->width  |= (horiz_size_ext << 12);
1390     s->height |= (vert_size_ext  << 12);
1391     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1392     s->bit_rate += (bit_rate_ext << 18) * 400;
1393     skip_bits1(&s->gb); /* marker */
1394     s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1395
1396     s->low_delay = get_bits1(&s->gb);
1397     if (s->flags & CODEC_FLAG_LOW_DELAY)
1398         s->low_delay = 1;
1399
1400     s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1401     s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1402
1403     av_dlog(s->avctx, "sequence extension\n");
1404     s->codec_id      = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1405
1406     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1407         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%d\n",
1408                s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format, s->avctx->rc_buffer_size, s->bit_rate);
1409
1410 }
1411
1412 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1413 {
1414     MpegEncContext *s = &s1->mpeg_enc_ctx;
1415     int color_description, w, h;
1416
1417     skip_bits(&s->gb, 3); /* video format */
1418     color_description = get_bits1(&s->gb);
1419     if (color_description) {
1420         s->avctx->color_primaries = get_bits(&s->gb, 8);
1421         s->avctx->color_trc       = get_bits(&s->gb, 8);
1422         s->avctx->colorspace      = get_bits(&s->gb, 8);
1423     }
1424     w = get_bits(&s->gb, 14);
1425     skip_bits(&s->gb, 1); //marker
1426     h = get_bits(&s->gb, 14);
1427     // remaining 3 bits are zero padding
1428
1429     s1->pan_scan.width  = 16 * w;
1430     s1->pan_scan.height = 16 * h;
1431
1432     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1433         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1434 }
1435
1436 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1437 {
1438     MpegEncContext *s = &s1->mpeg_enc_ctx;
1439     int i, nofco;
1440
1441     nofco = 1;
1442     if (s->progressive_sequence) {
1443         if (s->repeat_first_field) {
1444             nofco++;
1445             if (s->top_field_first)
1446                 nofco++;
1447         }
1448     } else {
1449         if (s->picture_structure == PICT_FRAME) {
1450             nofco++;
1451             if (s->repeat_first_field)
1452                 nofco++;
1453         }
1454     }
1455     for (i = 0; i < nofco; i++) {
1456         s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1457         skip_bits(&s->gb, 1); // marker
1458         s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1459         skip_bits(&s->gb, 1); // marker
1460     }
1461
1462     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1463         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1464                s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1465                s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1466                s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1467 }
1468
1469 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra)
1470 {
1471     int i;
1472
1473     for (i = 0; i < 64; i++) {
1474         int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1475         int v = get_bits(&s->gb, 8);
1476         if (v == 0) {
1477             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1478             return -1;
1479         }
1480         if (intra && i == 0 && v != 8) {
1481             av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1482             v = 8; // needed by pink.mpg / issue1046
1483         }
1484         matrix0[j] = v;
1485         if (matrix1)
1486             matrix1[j] = v;
1487     }
1488     return 0;
1489 }
1490
1491 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1492 {
1493     av_dlog(s->avctx, "matrix extension\n");
1494
1495     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1496     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1497     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL           , 1);
1498     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL           , 0);
1499 }
1500
1501 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1502 {
1503     MpegEncContext *s = &s1->mpeg_enc_ctx;
1504
1505     s->full_pel[0] = s->full_pel[1] = 0;
1506     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1507     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1508     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1509     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1510     if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1511         av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1512         if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1513             if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1514                 s->pict_type = AV_PICTURE_TYPE_I;
1515             else
1516                 s->pict_type = AV_PICTURE_TYPE_P;
1517         } else
1518             s->pict_type = AV_PICTURE_TYPE_B;
1519         s->current_picture.f.pict_type = s->pict_type;
1520         s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1521     }
1522     s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1523     s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1524     s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1525     s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1526
1527     s->intra_dc_precision         = get_bits(&s->gb, 2);
1528     s->picture_structure          = get_bits(&s->gb, 2);
1529     s->top_field_first            = get_bits1(&s->gb);
1530     s->frame_pred_frame_dct       = get_bits1(&s->gb);
1531     s->concealment_motion_vectors = get_bits1(&s->gb);
1532     s->q_scale_type               = get_bits1(&s->gb);
1533     s->intra_vlc_format           = get_bits1(&s->gb);
1534     s->alternate_scan             = get_bits1(&s->gb);
1535     s->repeat_first_field         = get_bits1(&s->gb);
1536     s->chroma_420_type            = get_bits1(&s->gb);
1537     s->progressive_frame          = get_bits1(&s->gb);
1538
1539
1540     if (s->alternate_scan) {
1541         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1542         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1543     } else {
1544         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1545         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1546     }
1547
1548     /* composite display not parsed */
1549     av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1550     av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1551     av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1552     av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1553     av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1554     av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1555     av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1556     av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1557     av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1558 }
1559
1560 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1561 {
1562     AVCodecContext *avctx = s->avctx;
1563     Mpeg1Context *s1 = (Mpeg1Context*)s;
1564
1565     /* start frame decoding */
1566     if (s->first_field || s->picture_structure == PICT_FRAME) {
1567         AVFrameSideData *pan_scan;
1568
1569         if (ff_MPV_frame_start(s, avctx) < 0)
1570             return -1;
1571
1572         ff_mpeg_er_frame_start(s);
1573
1574         /* first check if we must repeat the frame */
1575         s->current_picture_ptr->f.repeat_pict = 0;
1576         if (s->repeat_first_field) {
1577             if (s->progressive_sequence) {
1578                 if (s->top_field_first)
1579                     s->current_picture_ptr->f.repeat_pict = 4;
1580                 else
1581                     s->current_picture_ptr->f.repeat_pict = 2;
1582             } else if (s->progressive_frame) {
1583                 s->current_picture_ptr->f.repeat_pict = 1;
1584             }
1585         }
1586
1587         pan_scan = av_frame_new_side_data(&s->current_picture_ptr->f,
1588                                           AV_FRAME_DATA_PANSCAN,
1589                                           sizeof(s1->pan_scan));
1590         if (!pan_scan)
1591             return AVERROR(ENOMEM);
1592         memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1593
1594         if (s1->a53_caption) {
1595             AVFrameSideData *sd = av_frame_new_side_data(
1596                 &s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1597                 s1->a53_caption_size);
1598             if (sd)
1599                 memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1600             av_freep(&s1->a53_caption);
1601         }
1602         if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1603             ff_thread_finish_setup(avctx);
1604     } else { // second field
1605         int i;
1606
1607         if (!s->current_picture_ptr) {
1608             av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1609             return -1;
1610         }
1611
1612         if (s->avctx->hwaccel &&
1613             (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1614             if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1615                 av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode first field\n");
1616         }
1617
1618         for (i = 0; i < 4; i++) {
1619             s->current_picture.f.data[i] = s->current_picture_ptr->f.data[i];
1620             if (s->picture_structure == PICT_BOTTOM_FIELD) {
1621                 s->current_picture.f.data[i] += s->current_picture_ptr->f.linesize[i];
1622             }
1623         }
1624     }
1625
1626     if (avctx->hwaccel) {
1627         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1628             return -1;
1629     }
1630
1631 #if FF_API_XVMC
1632 FF_DISABLE_DEPRECATION_WARNINGS
1633 // MPV_frame_start will call this function too,
1634 // but we need to call it on every field
1635     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1636         if (ff_xvmc_field_start(s, avctx) < 0)
1637             return -1;
1638 FF_ENABLE_DEPRECATION_WARNINGS
1639 #endif /* FF_API_XVMC */
1640
1641     return 0;
1642 }
1643
1644 #define DECODE_SLICE_ERROR -1
1645 #define DECODE_SLICE_OK     0
1646
1647 /**
1648  * Decode a slice.
1649  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1650  * @return DECODE_SLICE_ERROR if the slice is damaged,
1651  *         DECODE_SLICE_OK if this slice is OK
1652  */
1653 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1654                              const uint8_t **buf, int buf_size)
1655 {
1656     AVCodecContext *avctx = s->avctx;
1657     const int lowres      = s->avctx->lowres;
1658     const int field_pic   = s->picture_structure != PICT_FRAME;
1659
1660     s->resync_mb_x =
1661     s->resync_mb_y = -1;
1662
1663     av_assert0(mb_y < s->mb_height);
1664
1665     init_get_bits(&s->gb, *buf, buf_size * 8);
1666     if(s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1667         skip_bits(&s->gb, 3);
1668
1669     ff_mpeg1_clean_buffers(s);
1670     s->interlaced_dct = 0;
1671
1672     s->qscale = get_qscale(s);
1673
1674     if (s->qscale == 0) {
1675         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1676         return -1;
1677     }
1678
1679     /* extra slice info */
1680     if (skip_1stop_8data_bits(&s->gb) < 0)
1681         return AVERROR_INVALIDDATA;
1682
1683     s->mb_x = 0;
1684
1685     if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1686         skip_bits1(&s->gb);
1687     } else {
1688         while (get_bits_left(&s->gb) > 0) {
1689             int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1690                                 MBINCR_VLC_BITS, 2);
1691             if (code < 0) {
1692                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1693                 return -1;
1694             }
1695             if (code >= 33) {
1696                 if (code == 33) {
1697                     s->mb_x += 33;
1698                 }
1699                 /* otherwise, stuffing, nothing to do */
1700             } else {
1701                 s->mb_x += code;
1702                 break;
1703             }
1704         }
1705     }
1706
1707     if (s->mb_x >= (unsigned)s->mb_width) {
1708         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1709         return -1;
1710     }
1711
1712     if (avctx->hwaccel) {
1713         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1714         int start_code = -1;
1715         buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1716         if (buf_end < *buf + buf_size)
1717             buf_end -= 4;
1718         s->mb_y = mb_y;
1719         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1720             return DECODE_SLICE_ERROR;
1721         *buf = buf_end;
1722         return DECODE_SLICE_OK;
1723     }
1724
1725     s->resync_mb_x = s->mb_x;
1726     s->resync_mb_y = s->mb_y = mb_y;
1727     s->mb_skip_run = 0;
1728     ff_init_block_index(s);
1729
1730     if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1731         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1732              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",
1733                     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],
1734                     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")),
1735                     s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1736                     s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1737                     s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1738         }
1739     }
1740
1741     for (;;) {
1742 #if FF_API_XVMC
1743 FF_DISABLE_DEPRECATION_WARNINGS
1744         // If 1, we memcpy blocks in xvmcvideo.
1745         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1746             ff_xvmc_init_block(s); // set s->block
1747 FF_ENABLE_DEPRECATION_WARNINGS
1748 #endif /* FF_API_XVMC */
1749
1750         if (mpeg_decode_mb(s, s->block) < 0)
1751             return -1;
1752
1753         if (s->current_picture.motion_val[0] && !s->encoding) { // note motion_val is normally NULL unless we want to extract the MVs
1754             const int wrap = s->b8_stride;
1755             int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1756             int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1757             int motion_x, motion_y, dir, i;
1758
1759             for (i = 0; i < 2; i++) {
1760                 for (dir = 0; dir < 2; dir++) {
1761                     if (s->mb_intra || (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1762                         motion_x = motion_y = 0;
1763                     } else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1764                         motion_x = s->mv[dir][0][0];
1765                         motion_y = s->mv[dir][0][1];
1766                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1767                         motion_x = s->mv[dir][i][0];
1768                         motion_y = s->mv[dir][i][1];
1769                     }
1770
1771                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1772                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1773                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1774                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1775                     s->current_picture.ref_index [dir][b8_xy    ] =
1776                     s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1777                     av_assert2(s->field_select[dir][i] == 0 || s->field_select[dir][i] == 1);
1778                 }
1779                 xy += wrap;
1780                 b8_xy +=2;
1781             }
1782         }
1783
1784         s->dest[0] += 16 >> lowres;
1785         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1786         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1787
1788         ff_MPV_decode_mb(s, s->block);
1789
1790         if (++s->mb_x >= s->mb_width) {
1791             const int mb_size = 16 >> s->avctx->lowres;
1792
1793             ff_mpeg_draw_horiz_band(s, mb_size*(s->mb_y >> field_pic), mb_size);
1794             ff_MPV_report_decode_progress(s);
1795
1796             s->mb_x = 0;
1797             s->mb_y += 1 << field_pic;
1798
1799             if (s->mb_y >= s->mb_height) {
1800                 int left   = get_bits_left(&s->gb);
1801                 int is_d10 = s->chroma_format == 2 && s->pict_type == AV_PICTURE_TYPE_I && avctx->profile == 0 && avctx->level == 5
1802                              && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1803                              && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1804
1805                 if (left >= 32 && !is_d10) {
1806                     GetBitContext gb = s->gb;
1807                     align_get_bits(&gb);
1808                     if (show_bits(&gb, 24) == 0x060E2B) {
1809                         av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1810                         is_d10 = 1;
1811                     }
1812                 }
1813
1814                 if (left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1815                     || ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1816                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1817                     return -1;
1818                 } else
1819                     goto eos;
1820             }
1821
1822             ff_init_block_index(s);
1823         }
1824
1825         /* skip mb handling */
1826         if (s->mb_skip_run == -1) {
1827             /* read increment again */
1828             s->mb_skip_run = 0;
1829             for (;;) {
1830                 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1831                                     MBINCR_VLC_BITS, 2);
1832                 if (code < 0) {
1833                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1834                     return -1;
1835                 }
1836                 if (code >= 33) {
1837                     if (code == 33) {
1838                         s->mb_skip_run += 33;
1839                     } else if (code == 35) {
1840                         if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1841                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1842                             return -1;
1843                         }
1844                         goto eos; /* end of slice */
1845                     }
1846                     /* otherwise, stuffing, nothing to do */
1847                 } else {
1848                     s->mb_skip_run += code;
1849                     break;
1850                 }
1851             }
1852             if (s->mb_skip_run) {
1853                 int i;
1854                 if (s->pict_type == AV_PICTURE_TYPE_I) {
1855                     av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1856                     return -1;
1857                 }
1858
1859                 /* skip mb */
1860                 s->mb_intra = 0;
1861                 for (i = 0; i < 12; i++)
1862                     s->block_last_index[i] = -1;
1863                 if (s->picture_structure == PICT_FRAME)
1864                     s->mv_type = MV_TYPE_16X16;
1865                 else
1866                     s->mv_type = MV_TYPE_FIELD;
1867                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1868                     /* if P type, zero motion vector is implied */
1869                     s->mv_dir             = MV_DIR_FORWARD;
1870                     s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1871                     s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1872                     s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1873                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1874                 } else {
1875                     /* if B type, reuse previous vectors and directions */
1876                     s->mv[0][0][0] = s->last_mv[0][0][0];
1877                     s->mv[0][0][1] = s->last_mv[0][0][1];
1878                     s->mv[1][0][0] = s->last_mv[1][0][0];
1879                     s->mv[1][0][1] = s->last_mv[1][0][1];
1880                 }
1881             }
1882         }
1883     }
1884 eos: // end of slice
1885     *buf += (get_bits_count(&s->gb)-1)/8;
1886     av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1887     return 0;
1888 }
1889
1890 static int slice_decode_thread(AVCodecContext *c, void *arg)
1891 {
1892     MpegEncContext *s   = *(void**)arg;
1893     const uint8_t *buf  = s->gb.buffer;
1894     int mb_y            = s->start_mb_y;
1895     const int field_pic = s->picture_structure != PICT_FRAME;
1896
1897     s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1898
1899     for (;;) {
1900         uint32_t start_code;
1901         int ret;
1902
1903         ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1904         emms_c();
1905         av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1906                 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1907                 s->start_mb_y, s->end_mb_y, s->er.error_count);
1908         if (ret < 0) {
1909             if (c->err_recognition & AV_EF_EXPLODE)
1910                 return ret;
1911             if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1912                 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);
1913         } else {
1914             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);
1915         }
1916
1917         if (s->mb_y == s->end_mb_y)
1918             return 0;
1919
1920         start_code = -1;
1921         buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
1922         mb_y= start_code - SLICE_MIN_START_CODE;
1923         if(s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1924             mb_y += (*buf&0xE0)<<2;
1925         mb_y <<= field_pic;
1926         if (s->picture_structure == PICT_BOTTOM_FIELD)
1927             mb_y++;
1928         if (mb_y < 0 || mb_y >= s->end_mb_y)
1929             return -1;
1930     }
1931 }
1932
1933 /**
1934  * Handle slice ends.
1935  * @return 1 if it seems to be the last slice
1936  */
1937 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1938 {
1939     Mpeg1Context *s1 = avctx->priv_data;
1940     MpegEncContext *s = &s1->mpeg_enc_ctx;
1941
1942     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1943         return 0;
1944
1945     if (s->avctx->hwaccel) {
1946         if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1947             av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1948     }
1949
1950 #if FF_API_XVMC
1951 FF_DISABLE_DEPRECATION_WARNINGS
1952     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1953         ff_xvmc_field_end(s);
1954 FF_ENABLE_DEPRECATION_WARNINGS
1955 #endif /* FF_API_XVMC */
1956
1957     /* end of slice reached */
1958     if (/*s->mb_y << field_pic == s->mb_height &&*/ !s->first_field && !s->first_slice) {
1959         /* end of image */
1960
1961         ff_er_frame_end(&s->er);
1962
1963         ff_MPV_frame_end(s);
1964
1965         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
1966             int ret = av_frame_ref(pict, &s->current_picture_ptr->f);
1967             if (ret < 0)
1968                 return ret;
1969             ff_print_debug_info(s, s->current_picture_ptr, pict);
1970             ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
1971         } else {
1972             if (avctx->active_thread_type & FF_THREAD_FRAME)
1973                 s->picture_number++;
1974             /* latency of 1 frame for I- and P-frames */
1975             /* XXX: use another variable than picture_number */
1976             if (s->last_picture_ptr != NULL) {
1977                 int ret = av_frame_ref(pict, &s->last_picture_ptr->f);
1978                 if (ret < 0)
1979                     return ret;
1980                 ff_print_debug_info(s, s->last_picture_ptr, pict);
1981                 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
1982             }
1983         }
1984
1985         return 1;
1986     } else {
1987         return 0;
1988     }
1989 }
1990
1991 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1992                                  const uint8_t *buf, int buf_size)
1993 {
1994     Mpeg1Context *s1 = avctx->priv_data;
1995     MpegEncContext *s = &s1->mpeg_enc_ctx;
1996     int width, height;
1997     int i, v, j;
1998
1999     init_get_bits(&s->gb, buf, buf_size*8);
2000
2001     width  = get_bits(&s->gb, 12);
2002     height = get_bits(&s->gb, 12);
2003     if (width == 0 || height == 0) {
2004         av_log(avctx, AV_LOG_WARNING, "Invalid horizontal or vertical size "
2005                "value.\n");
2006         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2007             return AVERROR_INVALIDDATA;
2008     }
2009     s->aspect_ratio_info = get_bits(&s->gb, 4);
2010     if (s->aspect_ratio_info == 0) {
2011         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2012         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2013             return -1;
2014     }
2015     s->frame_rate_index = get_bits(&s->gb, 4);
2016     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2017         return -1;
2018     s->bit_rate = get_bits(&s->gb, 18) * 400;
2019     if (get_bits1(&s->gb) == 0) /* marker */
2020         return -1;
2021     s->width  = width;
2022     s->height = height;
2023
2024     s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2025     skip_bits(&s->gb, 1);
2026
2027     /* get matrix */
2028     if (get_bits1(&s->gb)) {
2029         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2030     } else {
2031         for (i = 0; i < 64; i++) {
2032             j = s->dsp.idct_permutation[i];
2033             v = ff_mpeg1_default_intra_matrix[i];
2034             s->intra_matrix[j]        = v;
2035             s->chroma_intra_matrix[j] = v;
2036         }
2037     }
2038     if (get_bits1(&s->gb)) {
2039         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2040     } else {
2041         for (i = 0; i < 64; i++) {
2042             int j = s->dsp.idct_permutation[i];
2043             v = ff_mpeg1_default_non_intra_matrix[i];
2044             s->inter_matrix[j]        = v;
2045             s->chroma_inter_matrix[j] = v;
2046         }
2047     }
2048
2049     if (show_bits(&s->gb, 23) != 0) {
2050         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2051         return -1;
2052     }
2053
2054     /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2055     s->progressive_sequence = 1;
2056     s->progressive_frame    = 1;
2057     s->picture_structure    = PICT_FRAME;
2058     s->first_field          = 0;
2059     s->frame_pred_frame_dct = 1;
2060     s->chroma_format        = 1;
2061     s->codec_id             = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2062     s->out_format           = FMT_MPEG1;
2063     s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2064     if (s->flags & CODEC_FLAG_LOW_DELAY)
2065         s->low_delay = 1;
2066
2067     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2068         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2069                s->avctx->rc_buffer_size, s->bit_rate);
2070
2071     return 0;
2072 }
2073
2074 static int vcr2_init_sequence(AVCodecContext *avctx)
2075 {
2076     Mpeg1Context *s1 = avctx->priv_data;
2077     MpegEncContext *s = &s1->mpeg_enc_ctx;
2078     int i, v;
2079
2080     /* start new MPEG-1 context decoding */
2081     s->out_format = FMT_MPEG1;
2082     if (s1->mpeg_enc_ctx_allocated) {
2083         ff_MPV_common_end(s);
2084         s1->mpeg_enc_ctx_allocated = 0;
2085     }
2086     s->width  = avctx->coded_width;
2087     s->height = avctx->coded_height;
2088     avctx->has_b_frames = 0; // true?
2089     s->low_delay = 1;
2090
2091     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2092     setup_hwaccel_for_pixfmt(avctx);
2093
2094     if (ff_MPV_common_init(s) < 0)
2095         return -1;
2096     s1->mpeg_enc_ctx_allocated = 1;
2097
2098     for (i = 0; i < 64; i++) {
2099         int j = s->dsp.idct_permutation[i];
2100         v = ff_mpeg1_default_intra_matrix[i];
2101         s->intra_matrix[j]        = v;
2102         s->chroma_intra_matrix[j] = v;
2103
2104         v = ff_mpeg1_default_non_intra_matrix[i];
2105         s->inter_matrix[j]        = v;
2106         s->chroma_inter_matrix[j] = v;
2107     }
2108
2109     s->progressive_sequence  = 1;
2110     s->progressive_frame     = 1;
2111     s->picture_structure     = PICT_FRAME;
2112     s->first_field           = 0;
2113     s->frame_pred_frame_dct  = 1;
2114     s->chroma_format         = 1;
2115     if (s->codec_tag == AV_RL32("BW10")) {
2116         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2117     } else {
2118         s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2119         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2120     }
2121     s1->save_width           = s->width;
2122     s1->save_height          = s->height;
2123     s1->save_progressive_seq = s->progressive_sequence;
2124     return 0;
2125 }
2126
2127
2128 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2129                               const uint8_t *p, int buf_size)
2130 {
2131     Mpeg1Context *s1 = avctx->priv_data;
2132
2133     if (buf_size >= 6 &&
2134         p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2135         p[4] == 3 && (p[5] & 0x40)) {
2136         /* extract A53 Part 4 CC data */
2137         int cc_count = p[5] & 0x1f;
2138         if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2139             av_freep(&s1->a53_caption);
2140             s1->a53_caption_size = cc_count * 3;
2141             s1->a53_caption = av_malloc(s1->a53_caption_size);
2142             if (s1->a53_caption) {
2143                 memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2144             }
2145         }
2146         return 1;
2147     } else if (buf_size >= 11 &&
2148         p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2149         /* extract DVD CC data */
2150         int cc_count = 0;
2151         int i;
2152         // There is a caption count field in the data, but it is often
2153         // incorect.  So count the number of captions present.
2154         for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2155             cc_count++;
2156         // Transform the DVD format into A53 Part 4 format
2157         if (cc_count > 0) {
2158             av_freep(&s1->a53_caption);
2159             s1->a53_caption_size = cc_count * 6;
2160             s1->a53_caption = av_malloc(s1->a53_caption_size);
2161             if (s1->a53_caption) {
2162                 uint8_t field1 = !!(p[4] & 0x80);
2163                 uint8_t *cap = s1->a53_caption;
2164                 p += 5;
2165                 for (i = 0; i < cc_count; i++) {
2166                     cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2167                     cap[1] = p[1];
2168                     cap[2] = p[2];
2169                     cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2170                     cap[4] = p[4];
2171                     cap[5] = p[5];
2172                     cap += 6;
2173                     p += 6;
2174                 }
2175             }
2176         }
2177         return 1;
2178     }
2179     return 0;
2180 }
2181
2182 static void mpeg_decode_user_data(AVCodecContext *avctx,
2183                                   const uint8_t *p, int buf_size)
2184 {
2185     Mpeg1Context *s = avctx->priv_data;
2186     const uint8_t *buf_end = p + buf_size;
2187
2188     if(buf_size > 29){
2189         int i;
2190         for(i=0; i<20; i++)
2191             if(!memcmp(p+i, "\0TMPGEXS\0", 9)){
2192                 s->tmpgexs= 1;
2193             }
2194
2195 /*        for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2196             av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2197         }
2198             av_log(avctx, AV_LOG_ERROR, "\n");*/
2199     }
2200
2201     /* we parse the DTG active format information */
2202     if (buf_end - p >= 5 &&
2203         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2204         int flags = p[4];
2205         p += 5;
2206         if (flags & 0x80) {
2207             /* skip event id */
2208             p += 2;
2209         }
2210         if (flags & 0x40) {
2211             if (buf_end - p < 1)
2212                 return;
2213             avctx->dtg_active_format = p[0] & 0x0f;
2214         }
2215     } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2216         return;
2217     }
2218 }
2219
2220 static void mpeg_decode_gop(AVCodecContext *avctx,
2221                             const uint8_t *buf, int buf_size)
2222 {
2223     Mpeg1Context *s1  = avctx->priv_data;
2224     MpegEncContext *s = &s1->mpeg_enc_ctx;
2225     int broken_link;
2226     int64_t tc;
2227
2228     init_get_bits(&s->gb, buf, buf_size*8);
2229
2230     tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2231
2232     s->closed_gop = get_bits1(&s->gb);
2233     /*broken_link indicate that after editing the
2234       reference frames of the first B-Frames after GOP I-Frame
2235       are missing (open gop)*/
2236     broken_link = get_bits1(&s->gb);
2237
2238     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2239         char tcbuf[AV_TIMECODE_STR_SIZE];
2240         av_timecode_make_mpeg_tc_string(tcbuf, tc);
2241         av_log(s->avctx, AV_LOG_DEBUG,
2242                "GOP (%s) closed_gop=%d broken_link=%d\n",
2243                tcbuf, s->closed_gop, broken_link);
2244     }
2245 }
2246
2247 static int decode_chunks(AVCodecContext *avctx,
2248                          AVFrame *picture, int *got_output,
2249                          const uint8_t *buf, int buf_size)
2250 {
2251     Mpeg1Context *s = avctx->priv_data;
2252     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2253     const uint8_t *buf_ptr = buf;
2254     const uint8_t *buf_end = buf + buf_size;
2255     int ret, input_size;
2256     int last_code = 0, skip_frame = 0;
2257     int picture_start_code_seen = 0;
2258
2259     for (;;) {
2260         /* find next start code */
2261         uint32_t start_code = -1;
2262         buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2263         if (start_code > 0x1ff) {
2264             if (!skip_frame) {
2265                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2266                     !avctx->hwaccel) {
2267                     int i;
2268                     av_assert0(avctx->thread_count > 1);
2269
2270                     avctx->execute(avctx, slice_decode_thread,  &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
2271                     for (i = 0; i < s->slice_count; i++)
2272                         s2->er.error_count += s2->thread_context[i]->er.error_count;
2273                 }
2274
2275                 if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
2276                     && uses_vdpau(avctx))
2277                     ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2278
2279                 ret = slice_end(avctx, picture);
2280                 if (ret < 0)
2281                     return ret;
2282                 else if (ret) {
2283                     if (s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2284                         *got_output = 1;
2285                 }
2286             }
2287             s2->pict_type = 0;
2288
2289             if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2290                 return AVERROR_INVALIDDATA;
2291
2292             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2293         }
2294
2295         input_size = buf_end - buf_ptr;
2296
2297         if (avctx->debug & FF_DEBUG_STARTCODE) {
2298             av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2299         }
2300
2301         /* prepare data for next start code */
2302         switch (start_code) {
2303         case SEQ_START_CODE:
2304             if (last_code == 0) {
2305                 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2306                 if(buf != avctx->extradata)
2307                     s->sync=1;
2308             } else {
2309                 av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2310                 if (avctx->err_recognition & AV_EF_EXPLODE)
2311                     return AVERROR_INVALIDDATA;
2312             }
2313             break;
2314
2315         case PICTURE_START_CODE:
2316             if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2317                /* If it's a frame picture, there can't be more than one picture header.
2318                   Yet, it does happen and we need to handle it. */
2319                av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2320                break;
2321             }
2322             picture_start_code_seen = 1;
2323
2324             if (s2->width <= 0 || s2->height <= 0) {
2325                 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2326                        s2->width, s2->height);
2327                 return AVERROR_INVALIDDATA;
2328             }
2329
2330             if(s->tmpgexs){
2331                 s2->intra_dc_precision= 3;
2332                 s2->intra_matrix[0]= 1;
2333             }
2334             if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2335                 !avctx->hwaccel && s->slice_count) {
2336                 int i;
2337
2338                 avctx->execute(avctx, slice_decode_thread,
2339                                s2->thread_context, NULL,
2340                                s->slice_count, sizeof(void*));
2341                 for (i = 0; i < s->slice_count; i++)
2342                     s2->er.error_count += s2->thread_context[i]->er.error_count;
2343                 s->slice_count = 0;
2344             }
2345             if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2346                 ret = mpeg_decode_postinit(avctx);
2347                 if (ret < 0) {
2348                     av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
2349                     return ret;
2350                 }
2351
2352                 /* we have a complete image: we try to decompress it */
2353                 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2354                     s2->pict_type = 0;
2355                 s2->first_slice = 1;
2356                 last_code = PICTURE_START_CODE;
2357             } else {
2358                 av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
2359                 if (avctx->err_recognition & AV_EF_EXPLODE)
2360                     return AVERROR_INVALIDDATA;
2361             }
2362             break;
2363         case EXT_START_CODE:
2364             init_get_bits(&s2->gb, buf_ptr, input_size*8);
2365
2366             switch (get_bits(&s2->gb, 4)) {
2367             case 0x1:
2368                 if (last_code == 0) {
2369                 mpeg_decode_sequence_extension(s);
2370                 } else {
2371                     av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
2372                     if (avctx->err_recognition & AV_EF_EXPLODE)
2373                         return AVERROR_INVALIDDATA;
2374                 }
2375                 break;
2376             case 0x2:
2377                 mpeg_decode_sequence_display_extension(s);
2378                 break;
2379             case 0x3:
2380                 mpeg_decode_quant_matrix_extension(s2);
2381                 break;
2382             case 0x7:
2383                 mpeg_decode_picture_display_extension(s);
2384                 break;
2385             case 0x8:
2386                 if (last_code == PICTURE_START_CODE) {
2387                     mpeg_decode_picture_coding_extension(s);
2388                 } else {
2389                     av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
2390                     if (avctx->err_recognition & AV_EF_EXPLODE)
2391                         return AVERROR_INVALIDDATA;
2392                 }
2393                 break;
2394             }
2395             break;
2396         case USER_START_CODE:
2397             mpeg_decode_user_data(avctx, buf_ptr, input_size);
2398             break;
2399         case GOP_START_CODE:
2400             if (last_code == 0) {
2401                 s2->first_field=0;
2402                 mpeg_decode_gop(avctx, buf_ptr, input_size);
2403                 s->sync=1;
2404             } else {
2405                 av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
2406                 if (avctx->err_recognition & AV_EF_EXPLODE)
2407                     return AVERROR_INVALIDDATA;
2408             }
2409             break;
2410         default:
2411             if (start_code >= SLICE_MIN_START_CODE &&
2412                 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2413
2414                 if (s2->progressive_sequence && !s2->progressive_frame) {
2415                     s2->progressive_frame = 1;
2416                     av_log(s2->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
2417                 }
2418
2419                 if (s2->picture_structure == 0 || (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2420                     av_log(s2->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s2->picture_structure);
2421                     s2->picture_structure = PICT_FRAME;
2422                 }
2423
2424                 if (s2->progressive_sequence && !s2->frame_pred_frame_dct) {
2425                     av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2426                 }
2427
2428                 if (s2->picture_structure == PICT_FRAME) {
2429                     s2->first_field = 0;
2430                     s2->v_edge_pos  = 16 * s2->mb_height;
2431                 } else {
2432                     s2->first_field ^= 1;
2433                     s2->v_edge_pos   = 8 * s2->mb_height;
2434                     memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2435                 }
2436             }
2437             if (start_code >= SLICE_MIN_START_CODE &&
2438                 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2439                 const int field_pic = s2->picture_structure != PICT_FRAME;
2440                 int mb_y = start_code - SLICE_MIN_START_CODE;
2441                 last_code = SLICE_MIN_START_CODE;
2442                 if(s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2443                     mb_y += (*buf_ptr&0xE0)<<2;
2444
2445                 mb_y <<= field_pic;
2446                 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2447                     mb_y++;
2448
2449                 if (buf_end - buf_ptr < 2) {
2450                     av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2451                     return AVERROR_INVALIDDATA;
2452                 }
2453
2454                 if (mb_y >= s2->mb_height) {
2455                     av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2456                     return -1;
2457                 }
2458
2459                 if (s2->last_picture_ptr == NULL) {
2460                 /* Skip B-frames if we do not have reference frames and gop is not closed */
2461                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
2462                         if (!s2->closed_gop) {
2463                             skip_frame = 1;
2464                             break;
2465                         }
2466                     }
2467                 }
2468                 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
2469                     s->sync=1;
2470                 if (s2->next_picture_ptr == NULL) {
2471                 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2472                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2473                         skip_frame = 1;
2474                         break;
2475                     }
2476                 }
2477                 if ((avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type == AV_PICTURE_TYPE_B) ||
2478                     (avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type != AV_PICTURE_TYPE_I) ||
2479                      avctx->skip_frame >= AVDISCARD_ALL) {
2480                     skip_frame = 1;
2481                     break;
2482                 }
2483
2484                 if (!s->mpeg_enc_ctx_allocated)
2485                     break;
2486
2487                 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2488                     if (mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2489                         break;
2490                 }
2491
2492                 if (!s2->pict_type) {
2493                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2494                     if (avctx->err_recognition & AV_EF_EXPLODE)
2495                         return AVERROR_INVALIDDATA;
2496                     break;
2497                 }
2498
2499                 if (s2->first_slice) {
2500                     skip_frame = 0;
2501                     s2->first_slice = 0;
2502                     if (mpeg_field_start(s2, buf, buf_size) < 0)
2503                         return -1;
2504                 }
2505                 if (!s2->current_picture_ptr) {
2506                     av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2507                     return AVERROR_INVALIDDATA;
2508                 }
2509
2510                 if (uses_vdpau(avctx)) {
2511                     s->slice_count++;
2512                     break;
2513                 }
2514
2515                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2516                     !avctx->hwaccel) {
2517                     int threshold = (s2->mb_height * s->slice_count +
2518                                      s2->slice_context_count / 2) /
2519                                     s2->slice_context_count;
2520                     av_assert0(avctx->thread_count > 1);
2521                     if (threshold <= mb_y) {
2522                         MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2523
2524                         thread_context->start_mb_y = mb_y;
2525                         thread_context->end_mb_y   = s2->mb_height;
2526                         if (s->slice_count) {
2527                             s2->thread_context[s->slice_count-1]->end_mb_y = mb_y;
2528                             ret = ff_update_duplicate_context(thread_context,
2529                                                               s2);
2530                             if (ret < 0)
2531                                 return ret;
2532                         }
2533                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2534                         s->slice_count++;
2535                     }
2536                     buf_ptr += 2; // FIXME add minimum number of bytes per slice
2537                 } else {
2538                     ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2539                     emms_c();
2540
2541                     if (ret < 0) {
2542                         if (avctx->err_recognition & AV_EF_EXPLODE)
2543                             return ret;
2544                         if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2545                             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);
2546                     } else {
2547                         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);
2548                     }
2549                 }
2550             }
2551             break;
2552         }
2553     }
2554 }
2555
2556 static int mpeg_decode_frame(AVCodecContext *avctx,
2557                              void *data, int *got_output,
2558                              AVPacket *avpkt)
2559 {
2560     const uint8_t *buf = avpkt->data;
2561     int ret;
2562     int buf_size = avpkt->size;
2563     Mpeg1Context *s = avctx->priv_data;
2564     AVFrame *picture = data;
2565     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2566     av_dlog(avctx, "fill_buffer\n");
2567
2568     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2569         /* special case for last picture */
2570         if (s2->low_delay == 0 && s2->next_picture_ptr) {
2571             int ret = av_frame_ref(picture, &s2->next_picture_ptr->f);
2572             if (ret < 0)
2573                 return ret;
2574
2575             s2->next_picture_ptr = NULL;
2576
2577             *got_output = 1;
2578         }
2579         return buf_size;
2580     }
2581
2582     if (s2->flags & CODEC_FLAG_TRUNCATED) {
2583         int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2584
2585         if (ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0)
2586             return buf_size;
2587     }
2588
2589     s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2590     if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2591                                            || s2->codec_tag == AV_RL32("BW10")
2592                                           ))
2593         vcr2_init_sequence(avctx);
2594
2595     s->slice_count = 0;
2596
2597     if (avctx->extradata && !s->extradata_decoded) {
2598         ret = decode_chunks(avctx, picture, got_output, avctx->extradata, avctx->extradata_size);
2599         if(*got_output) {
2600             av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2601             *got_output = 0;
2602         }
2603         s->extradata_decoded = 1;
2604         if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2605             s2->current_picture_ptr = NULL;
2606             return ret;
2607         }
2608     }
2609
2610     ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2611     if (ret<0 || *got_output)
2612         s2->current_picture_ptr = NULL;
2613
2614     return ret;
2615 }
2616
2617
2618 static void flush(AVCodecContext *avctx)
2619 {
2620     Mpeg1Context *s = avctx->priv_data;
2621
2622     s->sync=0;
2623
2624     ff_mpeg_flush(avctx);
2625 }
2626
2627 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2628 {
2629     Mpeg1Context *s = avctx->priv_data;
2630
2631     if (s->mpeg_enc_ctx_allocated)
2632         ff_MPV_common_end(&s->mpeg_enc_ctx);
2633     av_freep(&s->a53_caption);
2634     return 0;
2635 }
2636
2637 static const AVProfile mpeg2_video_profiles[] = {
2638     { FF_PROFILE_MPEG2_422,          "4:2:2"              },
2639     { FF_PROFILE_MPEG2_HIGH,         "High"               },
2640     { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
2641     { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
2642     { FF_PROFILE_MPEG2_MAIN,         "Main"               },
2643     { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
2644     { FF_PROFILE_RESERVED,           "Reserved"           },
2645     { FF_PROFILE_RESERVED,           "Reserved"           },
2646     { FF_PROFILE_UNKNOWN },
2647 };
2648
2649
2650 AVCodec ff_mpeg1video_decoder = {
2651     .name                  = "mpeg1video",
2652     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2653     .type                  = AVMEDIA_TYPE_VIDEO,
2654     .id                    = AV_CODEC_ID_MPEG1VIDEO,
2655     .priv_data_size        = sizeof(Mpeg1Context),
2656     .init                  = mpeg_decode_init,
2657     .close                 = mpeg_decode_end,
2658     .decode                = mpeg_decode_frame,
2659     .capabilities          = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2660                              CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2661                              CODEC_CAP_SLICE_THREADS,
2662     .flush                 = flush,
2663     .max_lowres            = 3,
2664     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2665 };
2666
2667 AVCodec ff_mpeg2video_decoder = {
2668     .name           = "mpeg2video",
2669     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2670     .type           = AVMEDIA_TYPE_VIDEO,
2671     .id             = AV_CODEC_ID_MPEG2VIDEO,
2672     .priv_data_size = sizeof(Mpeg1Context),
2673     .init           = mpeg_decode_init,
2674     .close          = mpeg_decode_end,
2675     .decode         = mpeg_decode_frame,
2676     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2677                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2678                       CODEC_CAP_SLICE_THREADS,
2679     .flush          = flush,
2680     .max_lowres     = 3,
2681     .profiles       = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2682 };
2683
2684 //legacy decoder
2685 AVCodec ff_mpegvideo_decoder = {
2686     .name           = "mpegvideo",
2687     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2688     .type           = AVMEDIA_TYPE_VIDEO,
2689     .id             = AV_CODEC_ID_MPEG2VIDEO,
2690     .priv_data_size = sizeof(Mpeg1Context),
2691     .init           = mpeg_decode_init,
2692     .close          = mpeg_decode_end,
2693     .decode         = mpeg_decode_frame,
2694     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2695     .flush          = flush,
2696     .max_lowres     = 3,
2697 };
2698
2699 #if FF_API_XVMC
2700 #if CONFIG_MPEG_XVMC_DECODER
2701 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2702 {
2703     if (avctx->active_thread_type & FF_THREAD_SLICE)
2704         return -1;
2705     if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2706         return -1;
2707     if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2708         av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2709     }
2710     mpeg_decode_init(avctx);
2711
2712     avctx->pix_fmt           = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2713     avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2714
2715     return 0;
2716 }
2717
2718 AVCodec ff_mpeg_xvmc_decoder = {
2719     .name           = "mpegvideo_xvmc",
2720     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2721     .type           = AVMEDIA_TYPE_VIDEO,
2722     .id             = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2723     .priv_data_size = sizeof(Mpeg1Context),
2724     .init           = mpeg_mc_decode_init,
2725     .close          = mpeg_decode_end,
2726     .decode         = mpeg_decode_frame,
2727     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2728                       CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2729     .flush          = flush,
2730 };
2731
2732 #endif
2733 #endif /* FF_API_XVMC */
2734
2735 #if CONFIG_MPEG_VDPAU_DECODER
2736 AVCodec ff_mpeg_vdpau_decoder = {
2737     .name           = "mpegvideo_vdpau",
2738     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2739     .type           = AVMEDIA_TYPE_VIDEO,
2740     .id             = AV_CODEC_ID_MPEG2VIDEO,
2741     .priv_data_size = sizeof(Mpeg1Context),
2742     .init           = mpeg_decode_init,
2743     .close          = mpeg_decode_end,
2744     .decode         = mpeg_decode_frame,
2745     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2746                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2747     .flush          = flush,
2748 };
2749 #endif
2750
2751 #if CONFIG_MPEG1_VDPAU_DECODER
2752 AVCodec ff_mpeg1_vdpau_decoder = {
2753     .name           = "mpeg1video_vdpau",
2754     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2755     .type           = AVMEDIA_TYPE_VIDEO,
2756     .id             = AV_CODEC_ID_MPEG1VIDEO,
2757     .priv_data_size = sizeof(Mpeg1Context),
2758     .init           = mpeg_decode_init,
2759     .close          = mpeg_decode_end,
2760     .decode         = mpeg_decode_frame,
2761     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2762                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2763     .flush          = flush,
2764 };
2765 #endif