lavc decoders: work with refcounted frames.
[ffmpeg.git] / libavcodec / mpeg12.c
1 /*
2  * MPEG-1/2 decoder
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of Libav.
7  *
8  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22
23 /**
24  * @file
25  * MPEG-1/2 decoder
26  */
27
28 //#define DEBUG
29 #include "internal.h"
30 #include "avcodec.h"
31 #include "dsputil.h"
32 #include "mpegvideo.h"
33 #include "error_resilience.h"
34 #include "mpeg12.h"
35 #include "mpeg12data.h"
36 #include "mpeg12decdata.h"
37 #include "bytestream.h"
38 #include "vdpau_internal.h"
39 #include "xvmc_internal.h"
40 #include "thread.h"
41
42 //#undef NDEBUG
43 //#include <assert.h>
44
45
46 #define MV_VLC_BITS 9
47 #define MBINCR_VLC_BITS 9
48 #define MB_PAT_VLC_BITS 9
49 #define MB_PTYPE_VLC_BITS 6
50 #define MB_BTYPE_VLC_BITS 6
51
52 static VLC mv_vlc;
53
54 /* as H.263, but only 17 codes */
55 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
56 {
57     int code, sign, val, shift;
58
59     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
60     if (code == 0) {
61         return pred;
62     }
63     if (code < 0) {
64         return 0xffff;
65     }
66
67     sign  = get_bits1(&s->gb);
68     shift = fcode - 1;
69     val   = code;
70     if (shift) {
71         val  = (val - 1) << shift;
72         val |= get_bits(&s->gb, shift);
73         val++;
74     }
75     if (sign)
76         val = -val;
77     val += pred;
78
79     /* modulo decoding */
80     return sign_extend(val, 5 + shift);
81 }
82
83 static inline int mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
84 {
85     int level, dc, diff, i, j, run;
86     int component;
87     RLTable *rl = &ff_rl_mpeg1;
88     uint8_t * const scantable    = s->intra_scantable.permutated;
89     const uint16_t *quant_matrix = s->intra_matrix;
90     const int qscale             = s->qscale;
91
92     /* DC coefficient */
93     component = (n <= 3 ? 0 : n - 4 + 1);
94     diff = decode_dc(&s->gb, component);
95     if (diff >= 0xffff)
96         return -1;
97     dc  = s->last_dc[component];
98     dc += diff;
99     s->last_dc[component] = dc;
100     block[0] = dc * quant_matrix[0];
101     av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
102     i = 0;
103     {
104         OPEN_READER(re, &s->gb);
105         /* now quantify & encode AC coefficients */
106         for (;;) {
107             UPDATE_CACHE(re, &s->gb);
108             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
109
110             if (level == 127) {
111                 break;
112             } else if (level != 0) {
113                 i += run;
114                 j = scantable[i];
115                 level = (level * qscale * quant_matrix[j]) >> 4;
116                 level = (level - 1) | 1;
117                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
118                 LAST_SKIP_BITS(re, &s->gb, 1);
119             } else {
120                 /* escape */
121                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
122                 UPDATE_CACHE(re, &s->gb);
123                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
124                 if (level == -128) {
125                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
126                 } else if (level == 0) {
127                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
128                 }
129                 i += run;
130                 j = scantable[i];
131                 if (level < 0) {
132                     level = -level;
133                     level = (level * qscale * quant_matrix[j]) >> 4;
134                     level = (level - 1) | 1;
135                     level = -level;
136                 } else {
137                     level = (level * qscale * quant_matrix[j]) >> 4;
138                     level = (level - 1) | 1;
139                 }
140             }
141             if (i > 63) {
142                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
143                 return -1;
144             }
145
146             block[j] = level;
147         }
148         CLOSE_READER(re, &s->gb);
149     }
150     s->block_last_index[n] = i;
151    return 0;
152 }
153
154 int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
155 {
156     return mpeg1_decode_block_intra(s, block, n);
157 }
158
159 static inline int mpeg1_decode_block_inter(MpegEncContext *s, int16_t *block, int n)
160 {
161     int level, i, j, run;
162     RLTable *rl = &ff_rl_mpeg1;
163     uint8_t * const scantable    = s->intra_scantable.permutated;
164     const uint16_t *quant_matrix = s->inter_matrix;
165     const int qscale             = s->qscale;
166
167     {
168         OPEN_READER(re, &s->gb);
169         i = -1;
170         // special case for first coefficient, no need to add second VLC table
171         UPDATE_CACHE(re, &s->gb);
172         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
173             level = (3 * qscale * quant_matrix[0]) >> 5;
174             level = (level - 1) | 1;
175             if (GET_CACHE(re, &s->gb) & 0x40000000)
176                 level = -level;
177             block[0] = level;
178             i++;
179             SKIP_BITS(re, &s->gb, 2);
180             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
181                 goto end;
182         }
183         /* now quantify & encode AC coefficients */
184         for (;;) {
185             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
186
187             if (level != 0) {
188                 i += run;
189                 j = scantable[i];
190                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
191                 level = (level - 1) | 1;
192                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
193                 SKIP_BITS(re, &s->gb, 1);
194             } else {
195                 /* escape */
196                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
197                 UPDATE_CACHE(re, &s->gb);
198                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
199                 if (level == -128) {
200                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
201                 } else if (level == 0) {
202                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
203                 }
204                 i += run;
205                 j = scantable[i];
206                 if (level < 0) {
207                     level = -level;
208                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
209                     level = (level - 1) | 1;
210                     level = -level;
211                 } else {
212                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
213                     level = (level - 1) | 1;
214                 }
215             }
216             if (i > 63) {
217                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
218                 return -1;
219             }
220
221             block[j] = level;
222             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
223                 break;
224             UPDATE_CACHE(re, &s->gb);
225         }
226 end:
227         LAST_SKIP_BITS(re, &s->gb, 2);
228         CLOSE_READER(re, &s->gb);
229     }
230     s->block_last_index[n] = i;
231     return 0;
232 }
233
234 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, int16_t *block, int n)
235 {
236     int level, i, j, run;
237     RLTable *rl = &ff_rl_mpeg1;
238     uint8_t * const scantable = s->intra_scantable.permutated;
239     const int qscale          = s->qscale;
240
241     {
242         OPEN_READER(re, &s->gb);
243         i = -1;
244         // special case for first coefficient, no need to add second VLC table
245         UPDATE_CACHE(re, &s->gb);
246         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
247             level = (3 * qscale) >> 1;
248             level = (level - 1) | 1;
249             if (GET_CACHE(re, &s->gb) & 0x40000000)
250                 level = -level;
251             block[0] = level;
252             i++;
253             SKIP_BITS(re, &s->gb, 2);
254             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
255                 goto end;
256         }
257
258         /* now quantify & encode AC coefficients */
259         for (;;) {
260             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
261
262             if (level != 0) {
263                 i += run;
264                 j = scantable[i];
265                 level = ((level * 2 + 1) * qscale) >> 1;
266                 level = (level - 1) | 1;
267                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
268                 SKIP_BITS(re, &s->gb, 1);
269             } else {
270                 /* escape */
271                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
272                 UPDATE_CACHE(re, &s->gb);
273                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
274                 if (level == -128) {
275                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
276                 } else if (level == 0) {
277                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
278                 }
279                 i += run;
280                 j = scantable[i];
281                 if (level < 0) {
282                     level = -level;
283                     level = ((level * 2 + 1) * qscale) >> 1;
284                     level = (level - 1) | 1;
285                     level = -level;
286                 } else {
287                     level = ((level * 2 + 1) * qscale) >> 1;
288                     level = (level - 1) | 1;
289                 }
290             }
291
292             block[j] = level;
293             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
294                 break;
295             UPDATE_CACHE(re, &s->gb);
296         }
297 end:
298         LAST_SKIP_BITS(re, &s->gb, 2);
299         CLOSE_READER(re, &s->gb);
300     }
301     s->block_last_index[n] = i;
302     return 0;
303 }
304
305
306 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, int16_t *block, int n)
307 {
308     int level, i, j, run;
309     RLTable *rl = &ff_rl_mpeg1;
310     uint8_t * const scantable = s->intra_scantable.permutated;
311     const uint16_t *quant_matrix;
312     const int qscale = s->qscale;
313     int mismatch;
314
315     mismatch = 1;
316
317     {
318         OPEN_READER(re, &s->gb);
319         i = -1;
320         if (n < 4)
321             quant_matrix = s->inter_matrix;
322         else
323             quant_matrix = s->chroma_inter_matrix;
324
325         // special case for first coefficient, no need to add second VLC table
326         UPDATE_CACHE(re, &s->gb);
327         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
328             level= (3 * qscale * quant_matrix[0]) >> 5;
329             if (GET_CACHE(re, &s->gb) & 0x40000000)
330                 level = -level;
331             block[0]  = level;
332             mismatch ^= level;
333             i++;
334             SKIP_BITS(re, &s->gb, 2);
335             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
336                 goto end;
337         }
338
339         /* now quantify & encode AC coefficients */
340         for (;;) {
341             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
342
343             if (level != 0) {
344                 i += run;
345                 j = scantable[i];
346                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
347                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
348                 SKIP_BITS(re, &s->gb, 1);
349             } else {
350                 /* escape */
351                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
352                 UPDATE_CACHE(re, &s->gb);
353                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
354
355                 i += run;
356                 j = scantable[i];
357                 if (level < 0) {
358                     level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
359                     level = -level;
360                 } else {
361                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
362                 }
363             }
364             if (i > 63) {
365                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
366                 return -1;
367             }
368
369             mismatch ^= level;
370             block[j]  = level;
371             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
372                 break;
373             UPDATE_CACHE(re, &s->gb);
374         }
375 end:
376         LAST_SKIP_BITS(re, &s->gb, 2);
377         CLOSE_READER(re, &s->gb);
378     }
379     block[63] ^= (mismatch & 1);
380
381     s->block_last_index[n] = i;
382     return 0;
383 }
384
385 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
386                                                     int16_t *block, int n)
387 {
388     int level, i, j, run;
389     RLTable *rl = &ff_rl_mpeg1;
390     uint8_t * const scantable = s->intra_scantable.permutated;
391     const int qscale          = s->qscale;
392     OPEN_READER(re, &s->gb);
393     i = -1;
394
395     // special case for first coefficient, no need to add second VLC table
396     UPDATE_CACHE(re, &s->gb);
397     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
398         level = (3 * qscale) >> 1;
399         if (GET_CACHE(re, &s->gb) & 0x40000000)
400             level = -level;
401         block[0] = level;
402         i++;
403         SKIP_BITS(re, &s->gb, 2);
404         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
405             goto end;
406     }
407
408     /* now quantify & encode AC coefficients */
409     for (;;) {
410         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
411
412         if (level != 0) {
413             i += run;
414             j  = scantable[i];
415             level = ((level * 2 + 1) * qscale) >> 1;
416             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
417             SKIP_BITS(re, &s->gb, 1);
418         } else {
419             /* escape */
420             run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
421             UPDATE_CACHE(re, &s->gb);
422             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
423
424             i += run;
425             j  = scantable[i];
426             if (level < 0) {
427                 level = ((-level * 2 + 1) * qscale) >> 1;
428                 level = -level;
429             } else {
430                 level = ((level * 2 + 1) * qscale) >> 1;
431             }
432         }
433
434         block[j] = level;
435         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
436             break;
437         UPDATE_CACHE(re, &s->gb);
438     }
439 end:
440     LAST_SKIP_BITS(re, &s->gb, 2);
441     CLOSE_READER(re, &s->gb);
442     s->block_last_index[n] = i;
443     return 0;
444 }
445
446
447 static inline int mpeg2_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
448 {
449     int level, dc, diff, i, j, run;
450     int component;
451     RLTable *rl;
452     uint8_t * const scantable = s->intra_scantable.permutated;
453     const uint16_t *quant_matrix;
454     const int qscale = s->qscale;
455     int mismatch;
456
457     /* DC coefficient */
458     if (n < 4) {
459         quant_matrix = s->intra_matrix;
460         component = 0;
461     } else {
462         quant_matrix = s->chroma_intra_matrix;
463         component = (n & 1) + 1;
464     }
465     diff = decode_dc(&s->gb, component);
466     if (diff >= 0xffff)
467         return -1;
468     dc  = s->last_dc[component];
469     dc += diff;
470     s->last_dc[component] = dc;
471     block[0] = dc << (3 - s->intra_dc_precision);
472     av_dlog(s->avctx, "dc=%d\n", block[0]);
473     mismatch = block[0] ^ 1;
474     i = 0;
475     if (s->intra_vlc_format)
476         rl = &ff_rl_mpeg2;
477     else
478         rl = &ff_rl_mpeg1;
479
480     {
481         OPEN_READER(re, &s->gb);
482         /* now quantify & encode AC coefficients */
483         for (;;) {
484             UPDATE_CACHE(re, &s->gb);
485             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
486
487             if (level == 127) {
488                 break;
489             } else if (level != 0) {
490                 i += run;
491                 j  = scantable[i];
492                 level = (level * qscale * quant_matrix[j]) >> 4;
493                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
494                 LAST_SKIP_BITS(re, &s->gb, 1);
495             } else {
496                 /* escape */
497                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
498                 UPDATE_CACHE(re, &s->gb);
499                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
500                 i += run;
501                 j  = scantable[i];
502                 if (level < 0) {
503                     level = (-level * qscale * quant_matrix[j]) >> 4;
504                     level = -level;
505                 } else {
506                     level = (level * qscale * quant_matrix[j]) >> 4;
507                 }
508             }
509             if (i > 63) {
510                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
511                 return -1;
512             }
513
514             mismatch ^= level;
515             block[j]  = level;
516         }
517         CLOSE_READER(re, &s->gb);
518     }
519     block[63] ^= mismatch & 1;
520
521     s->block_last_index[n] = i;
522     return 0;
523 }
524
525 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
526 {
527     int level, dc, diff, j, run;
528     int component;
529     RLTable *rl;
530     uint8_t * scantable = s->intra_scantable.permutated;
531     const uint16_t *quant_matrix;
532     const int qscale = s->qscale;
533
534     /* DC coefficient */
535     if (n < 4) {
536         quant_matrix = s->intra_matrix;
537         component = 0;
538     } else {
539         quant_matrix = s->chroma_intra_matrix;
540         component = (n & 1) + 1;
541     }
542     diff = decode_dc(&s->gb, component);
543     if (diff >= 0xffff)
544         return -1;
545     dc = s->last_dc[component];
546     dc += diff;
547     s->last_dc[component] = dc;
548     block[0] = dc << (3 - s->intra_dc_precision);
549     if (s->intra_vlc_format)
550         rl = &ff_rl_mpeg2;
551     else
552         rl = &ff_rl_mpeg1;
553
554     {
555         OPEN_READER(re, &s->gb);
556         /* now quantify & encode AC coefficients */
557         for (;;) {
558             UPDATE_CACHE(re, &s->gb);
559             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
560
561             if (level == 127) {
562                 break;
563             } else if (level != 0) {
564                 scantable += run;
565                 j = *scantable;
566                 level = (level * qscale * quant_matrix[j]) >> 4;
567                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
568                 LAST_SKIP_BITS(re, &s->gb, 1);
569             } else {
570                 /* escape */
571                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
572                 UPDATE_CACHE(re, &s->gb);
573                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
574                 scantable += run;
575                 j = *scantable;
576                 if (level < 0) {
577                     level = (-level * qscale * quant_matrix[j]) >> 4;
578                     level = -level;
579                 } else {
580                     level = (level * qscale * quant_matrix[j]) >> 4;
581                 }
582             }
583
584             block[j] = level;
585         }
586         CLOSE_READER(re, &s->gb);
587     }
588
589     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
590     return 0;
591 }
592
593 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
594
595 #define INIT_2D_VLC_RL(rl, static_size)\
596 {\
597     static RL_VLC_ELEM rl_vlc_table[static_size];\
598     INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
599                     &rl.table_vlc[0][1], 4, 2,\
600                     &rl.table_vlc[0][0], 4, 2, static_size);\
601 \
602     rl.rl_vlc[0] = rl_vlc_table;\
603     init_2d_vlc_rl(&rl);\
604 }
605
606 static void init_2d_vlc_rl(RLTable *rl)
607 {
608     int i;
609
610     for (i = 0; i < rl->vlc.table_size; i++) {
611         int code = rl->vlc.table[i][0];
612         int len  = rl->vlc.table[i][1];
613         int level, run;
614
615         if (len == 0) { // illegal code
616             run   = 65;
617             level = MAX_LEVEL;
618         } else if (len<0) { //more bits needed
619             run   = 0;
620             level = code;
621         } else {
622             if (code == rl->n) { //esc
623                 run   = 65;
624                 level = 0;
625             } else if (code == rl->n+1) { //eob
626                 run   = 0;
627                 level = 127;
628             } else {
629                 run   = rl->table_run  [code] + 1;
630                 level = rl->table_level[code];
631             }
632         }
633         rl->rl_vlc[0][i].len   = len;
634         rl->rl_vlc[0][i].level = level;
635         rl->rl_vlc[0][i].run   = run;
636     }
637 }
638
639 void ff_mpeg12_common_init(MpegEncContext *s)
640 {
641
642     s->y_dc_scale_table =
643     s->c_dc_scale_table = ff_mpeg2_dc_scale_table[s->intra_dc_precision];
644
645 }
646
647 void ff_mpeg1_clean_buffers(MpegEncContext *s)
648 {
649     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
650     s->last_dc[1] = s->last_dc[0];
651     s->last_dc[2] = s->last_dc[0];
652     memset(s->last_mv, 0, sizeof(s->last_mv));
653 }
654
655
656 /******************************************/
657 /* decoding */
658
659 VLC ff_dc_lum_vlc;
660 VLC ff_dc_chroma_vlc;
661
662 static VLC mbincr_vlc;
663 static VLC mb_ptype_vlc;
664 static VLC mb_btype_vlc;
665 static VLC mb_pat_vlc;
666
667 av_cold void ff_mpeg12_init_vlcs(void)
668 {
669     static int done = 0;
670
671     if (!done) {
672         done = 1;
673
674         INIT_VLC_STATIC(&ff_dc_lum_vlc, DC_VLC_BITS, 12,
675                         ff_mpeg12_vlc_dc_lum_bits, 1, 1,
676                         ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
677         INIT_VLC_STATIC(&ff_dc_chroma_vlc,  DC_VLC_BITS, 12,
678                         ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
679                         ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
680         INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
681                         &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
682                         &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
683         INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
684                         &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
685                         &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
686         INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
687                         &ff_mpeg12_mbPatTable[0][1], 2, 1,
688                         &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
689
690         INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
691                         &table_mb_ptype[0][1], 2, 1,
692                         &table_mb_ptype[0][0], 2, 1, 64);
693         INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
694                         &table_mb_btype[0][1], 2, 1,
695                         &table_mb_btype[0][0], 2, 1, 64);
696         ff_init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
697         ff_init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
698
699         INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
700         INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
701     }
702 }
703
704 static inline int get_dmv(MpegEncContext *s)
705 {
706     if (get_bits1(&s->gb))
707         return 1 - (get_bits1(&s->gb) << 1);
708     else
709         return 0;
710 }
711
712 static inline int get_qscale(MpegEncContext *s)
713 {
714     int qscale = get_bits(&s->gb, 5);
715     if (s->q_scale_type) {
716         return non_linear_qscale[qscale];
717     } else {
718         return qscale << 1;
719     }
720 }
721
722 static void exchange_uv(MpegEncContext *s)
723 {
724     int16_t (*tmp)[64];
725
726     tmp           = s->pblocks[4];
727     s->pblocks[4] = s->pblocks[5];
728     s->pblocks[5] = tmp;
729 }
730
731 /* motion type (for MPEG-2) */
732 #define MT_FIELD 1
733 #define MT_FRAME 2
734 #define MT_16X8  2
735 #define MT_DMV   3
736
737 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
738 {
739     int i, j, k, cbp, val, mb_type, motion_type;
740     const int mb_block_count = 4 + (1 << s->chroma_format);
741
742     av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
743
744     assert(s->mb_skipped == 0);
745
746     if (s->mb_skip_run-- != 0) {
747         if (s->pict_type == AV_PICTURE_TYPE_P) {
748             s->mb_skipped = 1;
749             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
750         } else {
751             int mb_type;
752
753             if (s->mb_x)
754                 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
755             else
756                 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
757             if (IS_INTRA(mb_type))
758                 return -1;
759             s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride] =
760                 mb_type | MB_TYPE_SKIP;
761 //            assert(s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1] & (MB_TYPE_16x16 | MB_TYPE_16x8));
762
763             if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
764                 s->mb_skipped = 1;
765         }
766
767         return 0;
768     }
769
770     switch (s->pict_type) {
771     default:
772     case AV_PICTURE_TYPE_I:
773         if (get_bits1(&s->gb) == 0) {
774             if (get_bits1(&s->gb) == 0) {
775                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
776                 return -1;
777             }
778             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
779         } else {
780             mb_type = MB_TYPE_INTRA;
781         }
782         break;
783     case AV_PICTURE_TYPE_P:
784         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
785         if (mb_type < 0) {
786             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
787             return -1;
788         }
789         mb_type = ptype2mb_type[mb_type];
790         break;
791     case AV_PICTURE_TYPE_B:
792         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
793         if (mb_type < 0) {
794             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
795             return -1;
796         }
797         mb_type = btype2mb_type[mb_type];
798         break;
799     }
800     av_dlog(s->avctx, "mb_type=%x\n", mb_type);
801 //    motion_type = 0; /* avoid warning */
802     if (IS_INTRA(mb_type)) {
803         s->dsp.clear_blocks(s->block[0]);
804
805         if (!s->chroma_y_shift) {
806             s->dsp.clear_blocks(s->block[6]);
807         }
808
809         /* compute DCT type */
810         if (s->picture_structure == PICT_FRAME && // FIXME add an interlaced_dct coded var?
811             !s->frame_pred_frame_dct) {
812             s->interlaced_dct = get_bits1(&s->gb);
813         }
814
815         if (IS_QUANT(mb_type))
816             s->qscale = get_qscale(s);
817
818         if (s->concealment_motion_vectors) {
819             /* just parse them */
820             if (s->picture_structure != PICT_FRAME)
821                 skip_bits1(&s->gb); /* field select */
822
823             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
824                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
825             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
826                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
827
828             skip_bits1(&s->gb); /* marker */
829         } else
830             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
831         s->mb_intra = 1;
832         // if 1, we memcpy blocks in xvmcvideo
833         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
834             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
835             if (s->swap_uv) {
836                 exchange_uv(s);
837             }
838         }
839
840         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
841             if (s->flags2 & CODEC_FLAG2_FAST) {
842                 for (i = 0; i < 6; i++) {
843                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
844                 }
845             } else {
846                 for (i = 0; i < mb_block_count; i++) {
847                     if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
848                         return -1;
849                 }
850             }
851         } else {
852             for (i = 0; i < 6; i++) {
853                 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
854                     return -1;
855             }
856         }
857     } else {
858         if (mb_type & MB_TYPE_ZERO_MV) {
859             assert(mb_type & MB_TYPE_CBP);
860
861             s->mv_dir = MV_DIR_FORWARD;
862             if (s->picture_structure == PICT_FRAME) {
863                 if (!s->frame_pred_frame_dct)
864                     s->interlaced_dct = get_bits1(&s->gb);
865                 s->mv_type = MV_TYPE_16X16;
866             } else {
867                 s->mv_type = MV_TYPE_FIELD;
868                 mb_type |= MB_TYPE_INTERLACED;
869                 s->field_select[0][0] = s->picture_structure - 1;
870             }
871
872             if (IS_QUANT(mb_type))
873                 s->qscale = get_qscale(s);
874
875             s->last_mv[0][0][0] = 0;
876             s->last_mv[0][0][1] = 0;
877             s->last_mv[0][1][0] = 0;
878             s->last_mv[0][1][1] = 0;
879             s->mv[0][0][0] = 0;
880             s->mv[0][0][1] = 0;
881         } else {
882             assert(mb_type & MB_TYPE_L0L1);
883             // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
884             /* get additional motion vector type */
885             if (s->frame_pred_frame_dct)
886                 motion_type = MT_FRAME;
887             else {
888                 motion_type = get_bits(&s->gb, 2);
889                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
890                     s->interlaced_dct = get_bits1(&s->gb);
891             }
892
893             if (IS_QUANT(mb_type))
894                 s->qscale = get_qscale(s);
895
896             /* motion vectors */
897             s->mv_dir = (mb_type >> 13) & 3;
898             av_dlog(s->avctx, "motion_type=%d\n", motion_type);
899             switch (motion_type) {
900             case MT_FRAME: /* or MT_16X8 */
901                 if (s->picture_structure == PICT_FRAME) {
902                     mb_type |= MB_TYPE_16x16;
903                     s->mv_type = MV_TYPE_16X16;
904                     for (i = 0; i < 2; i++) {
905                         if (USES_LIST(mb_type, i)) {
906                             /* MT_FRAME */
907                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
908                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
909                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
910                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
911                             /* full_pel: only for MPEG-1 */
912                             if (s->full_pel[i]) {
913                                 s->mv[i][0][0] <<= 1;
914                                 s->mv[i][0][1] <<= 1;
915                             }
916                         }
917                     }
918                 } else {
919                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
920                     s->mv_type = MV_TYPE_16X8;
921                     for (i = 0; i < 2; i++) {
922                         if (USES_LIST(mb_type, i)) {
923                             /* MT_16X8 */
924                             for (j = 0; j < 2; j++) {
925                                 s->field_select[i][j] = get_bits1(&s->gb);
926                                 for (k = 0; k < 2; k++) {
927                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
928                                                              s->last_mv[i][j][k]);
929                                     s->last_mv[i][j][k] = val;
930                                     s->mv[i][j][k]      = val;
931                                 }
932                             }
933                         }
934                     }
935                 }
936                 break;
937             case MT_FIELD:
938                 s->mv_type = MV_TYPE_FIELD;
939                 if (s->picture_structure == PICT_FRAME) {
940                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
941                     for (i = 0; i < 2; i++) {
942                         if (USES_LIST(mb_type, i)) {
943                             for (j = 0; j < 2; j++) {
944                                 s->field_select[i][j] = get_bits1(&s->gb);
945                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
946                                                          s->last_mv[i][j][0]);
947                                 s->last_mv[i][j][0] = val;
948                                 s->mv[i][j][0]      = val;
949                                 av_dlog(s->avctx, "fmx=%d\n", val);
950                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
951                                                          s->last_mv[i][j][1] >> 1);
952                                 s->last_mv[i][j][1] = val << 1;
953                                 s->mv[i][j][1]      = val;
954                                 av_dlog(s->avctx, "fmy=%d\n", val);
955                             }
956                         }
957                     }
958                 } else {
959                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
960                     for (i = 0; i < 2; i++) {
961                         if (USES_LIST(mb_type, i)) {
962                             s->field_select[i][0] = get_bits1(&s->gb);
963                             for (k = 0; k < 2; k++) {
964                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
965                                                          s->last_mv[i][0][k]);
966                                 s->last_mv[i][0][k] = val;
967                                 s->last_mv[i][1][k] = val;
968                                 s->mv[i][0][k]      = val;
969                             }
970                         }
971                     }
972                 }
973                 break;
974             case MT_DMV:
975                 s->mv_type = MV_TYPE_DMV;
976                 for (i = 0; i < 2; i++) {
977                     if (USES_LIST(mb_type, i)) {
978                         int dmx, dmy, mx, my, m;
979                         const int my_shift = s->picture_structure == PICT_FRAME;
980
981                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
982                                                 s->last_mv[i][0][0]);
983                         s->last_mv[i][0][0] = mx;
984                         s->last_mv[i][1][0] = mx;
985                         dmx = get_dmv(s);
986                         my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
987                                                  s->last_mv[i][0][1] >> my_shift);
988                         dmy = get_dmv(s);
989
990
991                         s->last_mv[i][0][1] = my << my_shift;
992                         s->last_mv[i][1][1] = my << my_shift;
993
994                         s->mv[i][0][0] = mx;
995                         s->mv[i][0][1] = my;
996                         s->mv[i][1][0] = mx; // not used
997                         s->mv[i][1][1] = my; // not used
998
999                         if (s->picture_structure == PICT_FRAME) {
1000                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1001
1002                             // m = 1 + 2 * s->top_field_first;
1003                             m = s->top_field_first ? 1 : 3;
1004
1005                             /* top -> top pred */
1006                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1007                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1008                             m = 4 - m;
1009                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1010                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1011                         } else {
1012                             mb_type |= MB_TYPE_16x16;
1013
1014                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1015                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1016                             if (s->picture_structure == PICT_TOP_FIELD)
1017                                 s->mv[i][2][1]--;
1018                             else
1019                                 s->mv[i][2][1]++;
1020                         }
1021                     }
1022                 }
1023                 break;
1024             default:
1025                 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1026                 return -1;
1027             }
1028         }
1029
1030         s->mb_intra = 0;
1031         if (HAS_CBP(mb_type)) {
1032             s->dsp.clear_blocks(s->block[0]);
1033
1034             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1035             if (mb_block_count > 6) {
1036                  cbp <<= mb_block_count - 6;
1037                  cbp  |= get_bits(&s->gb, mb_block_count - 6);
1038                  s->dsp.clear_blocks(s->block[6]);
1039             }
1040             if (cbp <= 0) {
1041                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1042                 return -1;
1043             }
1044
1045             //if 1, we memcpy blocks in xvmcvideo
1046             if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
1047                 ff_xvmc_pack_pblocks(s, cbp);
1048                 if (s->swap_uv) {
1049                     exchange_uv(s);
1050                 }
1051             }
1052
1053             if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1054                 if (s->flags2 & CODEC_FLAG2_FAST) {
1055                     for (i = 0; i < 6; i++) {
1056                         if (cbp & 32) {
1057                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1058                         } else {
1059                             s->block_last_index[i] = -1;
1060                         }
1061                         cbp += cbp;
1062                     }
1063                 } else {
1064                     cbp <<= 12-mb_block_count;
1065
1066                     for (i = 0; i < mb_block_count; i++) {
1067                         if (cbp & (1 << 11)) {
1068                             if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
1069                                 return -1;
1070                         } else {
1071                             s->block_last_index[i] = -1;
1072                         }
1073                         cbp += cbp;
1074                     }
1075                 }
1076             } else {
1077                 if (s->flags2 & CODEC_FLAG2_FAST) {
1078                     for (i = 0; i < 6; i++) {
1079                         if (cbp & 32) {
1080                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1081                         } else {
1082                             s->block_last_index[i] = -1;
1083                         }
1084                         cbp += cbp;
1085                     }
1086                 } else {
1087                     for (i = 0; i < 6; i++) {
1088                         if (cbp & 32) {
1089                             if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
1090                                 return -1;
1091                         } else {
1092                             s->block_last_index[i] = -1;
1093                         }
1094                         cbp += cbp;
1095                     }
1096                 }
1097             }
1098         } else {
1099             for (i = 0; i < 12; i++)
1100                 s->block_last_index[i] = -1;
1101         }
1102     }
1103
1104     s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1105
1106     return 0;
1107 }
1108
1109 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1110 {
1111     Mpeg1Context *s = avctx->priv_data;
1112     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1113     int i;
1114
1115     /* we need some permutation to store matrices,
1116      * until MPV_common_init() sets the real permutation. */
1117     for (i = 0; i < 64; i++)
1118        s2->dsp.idct_permutation[i]=i;
1119
1120     ff_MPV_decode_defaults(s2);
1121
1122     s->mpeg_enc_ctx.avctx  = avctx;
1123     s->mpeg_enc_ctx.flags  = avctx->flags;
1124     s->mpeg_enc_ctx.flags2 = avctx->flags2;
1125     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1126     ff_mpeg12_init_vlcs();
1127
1128     s->mpeg_enc_ctx_allocated      = 0;
1129     s->mpeg_enc_ctx.picture_number = 0;
1130     s->repeat_field                = 0;
1131     s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1132     avctx->color_range = AVCOL_RANGE_MPEG;
1133     if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1134         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1135     else
1136         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1137     return 0;
1138 }
1139
1140 static int mpeg_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
1141 {
1142     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1143     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1144     int err;
1145
1146     if (avctx == avctx_from || !ctx_from->mpeg_enc_ctx_allocated || !s1->context_initialized)
1147         return 0;
1148
1149     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1150     if (err) return err;
1151
1152     if (!ctx->mpeg_enc_ctx_allocated)
1153         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1154
1155     if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1156         s->picture_number++;
1157
1158     return 0;
1159 }
1160
1161 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1162                                  const uint8_t *new_perm)
1163 {
1164     uint16_t temp_matrix[64];
1165     int i;
1166
1167     memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1168
1169     for (i = 0; i < 64; i++) {
1170         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1171     }
1172 }
1173
1174 static const enum AVPixelFormat pixfmt_xvmc_mpg2_420[] = {
1175     AV_PIX_FMT_XVMC_MPEG2_IDCT,
1176     AV_PIX_FMT_XVMC_MPEG2_MC,
1177     AV_PIX_FMT_NONE };
1178
1179 static const enum AVPixelFormat mpeg12_hwaccel_pixfmt_list_420[] = {
1180 #if CONFIG_MPEG2_DXVA2_HWACCEL
1181     AV_PIX_FMT_DXVA2_VLD,
1182 #endif
1183 #if CONFIG_MPEG2_VAAPI_HWACCEL
1184     AV_PIX_FMT_VAAPI_VLD,
1185 #endif
1186 #if CONFIG_MPEG1_VDPAU_HWACCEL | CONFIG_MPEG2_VDPAU_HWACCEL
1187     AV_PIX_FMT_VDPAU,
1188 #endif
1189     AV_PIX_FMT_YUV420P,
1190     AV_PIX_FMT_NONE
1191 };
1192
1193 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1194 {
1195     Mpeg1Context *s1 = avctx->priv_data;
1196     MpegEncContext *s = &s1->mpeg_enc_ctx;
1197
1198     if (avctx->xvmc_acceleration)
1199         return avctx->get_format(avctx, pixfmt_xvmc_mpg2_420);
1200     else if (avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU) {
1201         if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO)
1202             return AV_PIX_FMT_VDPAU_MPEG1;
1203         else
1204             return AV_PIX_FMT_VDPAU_MPEG2;
1205     } else {
1206         if (s->chroma_format <  2)
1207             return avctx->get_format(avctx, mpeg12_hwaccel_pixfmt_list_420);
1208         else if (s->chroma_format == 2)
1209             return AV_PIX_FMT_YUV422P;
1210         else
1211             return AV_PIX_FMT_YUV444P;
1212     }
1213 }
1214
1215 /* Call this function when we know all parameters.
1216  * It may be called in different places for MPEG-1 and MPEG-2. */
1217 static int mpeg_decode_postinit(AVCodecContext *avctx)
1218 {
1219     Mpeg1Context *s1 = avctx->priv_data;
1220     MpegEncContext *s = &s1->mpeg_enc_ctx;
1221     uint8_t old_permutation[64];
1222
1223     if ((s1->mpeg_enc_ctx_allocated == 0) ||
1224         avctx->coded_width  != s->width   ||
1225         avctx->coded_height != s->height  ||
1226         s1->save_width           != s->width                ||
1227         s1->save_height          != s->height               ||
1228         s1->save_aspect_info     != s->aspect_ratio_info    ||
1229         s1->save_progressive_seq != s->progressive_sequence ||
1230         0)
1231     {
1232
1233         if (s1->mpeg_enc_ctx_allocated) {
1234             ParseContext pc = s->parse_context;
1235             s->parse_context.buffer = 0;
1236             ff_MPV_common_end(s);
1237             s->parse_context = pc;
1238         }
1239
1240         if ((s->width == 0) || (s->height == 0))
1241             return -2;
1242
1243         avcodec_set_dimensions(avctx, s->width, s->height);
1244         avctx->bit_rate          = s->bit_rate;
1245         s1->save_aspect_info     = s->aspect_ratio_info;
1246         s1->save_width           = s->width;
1247         s1->save_height          = s->height;
1248         s1->save_progressive_seq = s->progressive_sequence;
1249
1250         /* low_delay may be forced, in this case we will have B-frames
1251          * that behave like P-frames. */
1252         avctx->has_b_frames = !s->low_delay;
1253
1254         if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1255             //MPEG-1 fps
1256             avctx->time_base.den = ff_mpeg12_frame_rate_tab[s->frame_rate_index].num;
1257             avctx->time_base.num = ff_mpeg12_frame_rate_tab[s->frame_rate_index].den;
1258             //MPEG-1 aspect
1259             avctx->sample_aspect_ratio = av_d2q(1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1260             avctx->ticks_per_frame=1;
1261         } else {//MPEG-2
1262         //MPEG-2 fps
1263             av_reduce(&s->avctx->time_base.den,
1264                       &s->avctx->time_base.num,
1265                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1266                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1267                       1 << 30);
1268             avctx->ticks_per_frame = 2;
1269             //MPEG-2 aspect
1270             if (s->aspect_ratio_info > 1) {
1271                 AVRational dar =
1272                     av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1273                                       (AVRational) {s1->pan_scan.width, s1->pan_scan.height}),
1274                              (AVRational) {s->width, s->height});
1275
1276                 // we ignore the spec here and guess a bit as reality does not match the spec, see for example
1277                 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1278                 // issue1613, 621, 562
1279                 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1280                    (av_cmp_q(dar, (AVRational) {4, 3}) && av_cmp_q(dar, (AVRational) {16, 9}))) {
1281                     s->avctx->sample_aspect_ratio =
1282                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1283                                  (AVRational) {s->width, s->height});
1284                 } else {
1285                     s->avctx->sample_aspect_ratio =
1286                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1287                                  (AVRational) {s1->pan_scan.width, s1->pan_scan.height});
1288 //issue1613 4/3 16/9 -> 16/9
1289 //res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1290 //widescreen-issue562.mpg 4/3 16/9 -> 16/9
1291 //                    s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1292                     av_dlog(avctx, "A %d/%d\n",
1293                             ff_mpeg2_aspect[s->aspect_ratio_info].num, ff_mpeg2_aspect[s->aspect_ratio_info].den);
1294                     av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1295                             s->avctx->sample_aspect_ratio.den);
1296                 }
1297             } else {
1298                 s->avctx->sample_aspect_ratio =
1299                     ff_mpeg2_aspect[s->aspect_ratio_info];
1300             }
1301         } // MPEG-2
1302
1303         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1304         avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1305         // until then pix_fmt may be changed right after codec init
1306         if (avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT ||
1307             avctx->hwaccel                            ||
1308             s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)
1309             if (avctx->idct_algo == FF_IDCT_AUTO)
1310                 avctx->idct_algo = FF_IDCT_SIMPLE;
1311
1312         /* Quantization matrices may need reordering
1313          * if DCT permutation is changed. */
1314         memcpy(old_permutation, s->dsp.idct_permutation, 64 * sizeof(uint8_t));
1315
1316         if (ff_MPV_common_init(s) < 0)
1317             return -2;
1318
1319         quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->dsp.idct_permutation);
1320         quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->dsp.idct_permutation);
1321         quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->dsp.idct_permutation);
1322         quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->dsp.idct_permutation);
1323
1324         s1->mpeg_enc_ctx_allocated = 1;
1325     }
1326     return 0;
1327 }
1328
1329 static int mpeg1_decode_picture(AVCodecContext *avctx,
1330                                 const uint8_t *buf, int buf_size)
1331 {
1332     Mpeg1Context *s1 = avctx->priv_data;
1333     MpegEncContext *s = &s1->mpeg_enc_ctx;
1334     int ref, f_code, vbv_delay;
1335
1336     init_get_bits(&s->gb, buf, buf_size*8);
1337
1338     ref = get_bits(&s->gb, 10); /* temporal ref */
1339     s->pict_type = get_bits(&s->gb, 3);
1340     if (s->pict_type == 0 || s->pict_type > 3)
1341         return -1;
1342
1343     vbv_delay = get_bits(&s->gb, 16);
1344     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
1345         s->full_pel[0] = get_bits1(&s->gb);
1346         f_code = get_bits(&s->gb, 3);
1347         if (f_code == 0 && (avctx->err_recognition & AV_EF_BITSTREAM))
1348             return -1;
1349         s->mpeg_f_code[0][0] = f_code;
1350         s->mpeg_f_code[0][1] = f_code;
1351     }
1352     if (s->pict_type == AV_PICTURE_TYPE_B) {
1353         s->full_pel[1] = get_bits1(&s->gb);
1354         f_code = get_bits(&s->gb, 3);
1355         if (f_code == 0 && (avctx->err_recognition & AV_EF_BITSTREAM))
1356             return -1;
1357         s->mpeg_f_code[1][0] = f_code;
1358         s->mpeg_f_code[1][1] = f_code;
1359     }
1360     s->current_picture.f.pict_type = s->pict_type;
1361     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1362
1363     if (avctx->debug & FF_DEBUG_PICT_INFO)
1364         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1365
1366     s->y_dc_scale = 8;
1367     s->c_dc_scale = 8;
1368     return 0;
1369 }
1370
1371 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1372 {
1373     MpegEncContext *s= &s1->mpeg_enc_ctx;
1374     int horiz_size_ext, vert_size_ext;
1375     int bit_rate_ext;
1376
1377     skip_bits(&s->gb, 1); /* profile and level esc*/
1378     s->avctx->profile       = get_bits(&s->gb, 3);
1379     s->avctx->level         = get_bits(&s->gb, 4);
1380     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1381     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1382     horiz_size_ext          = get_bits(&s->gb, 2);
1383     vert_size_ext           = get_bits(&s->gb, 2);
1384     s->width  |= (horiz_size_ext << 12);
1385     s->height |= (vert_size_ext  << 12);
1386     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1387     s->bit_rate += (bit_rate_ext << 18) * 400;
1388     skip_bits1(&s->gb); /* marker */
1389     s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1390
1391     s->low_delay = get_bits1(&s->gb);
1392     if (s->flags & CODEC_FLAG_LOW_DELAY)
1393         s->low_delay = 1;
1394
1395     s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1396     s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1397
1398     av_dlog(s->avctx, "sequence extension\n");
1399     s->codec_id      = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1400
1401     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1402         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1403                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1404
1405 }
1406
1407 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1408 {
1409     MpegEncContext *s = &s1->mpeg_enc_ctx;
1410     int color_description, w, h;
1411
1412     skip_bits(&s->gb, 3); /* video format */
1413     color_description = get_bits1(&s->gb);
1414     if (color_description) {
1415         s->avctx->color_primaries = get_bits(&s->gb, 8);
1416         s->avctx->color_trc       = get_bits(&s->gb, 8);
1417         s->avctx->colorspace      = get_bits(&s->gb, 8);
1418     }
1419     w = get_bits(&s->gb, 14);
1420     skip_bits(&s->gb, 1); //marker
1421     h = get_bits(&s->gb, 14);
1422     // remaining 3 bits are zero padding
1423
1424     s1->pan_scan.width  = 16 * w;
1425     s1->pan_scan.height = 16 * h;
1426
1427     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1428         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1429 }
1430
1431 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1432 {
1433     MpegEncContext *s = &s1->mpeg_enc_ctx;
1434     int i, nofco;
1435
1436     nofco = 1;
1437     if (s->progressive_sequence) {
1438         if (s->repeat_first_field) {
1439             nofco++;
1440             if (s->top_field_first)
1441                 nofco++;
1442         }
1443     } else {
1444         if (s->picture_structure == PICT_FRAME) {
1445             nofco++;
1446             if (s->repeat_first_field)
1447                 nofco++;
1448         }
1449     }
1450     for (i = 0; i < nofco; i++) {
1451         s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1452         skip_bits(&s->gb, 1); // marker
1453         s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1454         skip_bits(&s->gb, 1); // marker
1455     }
1456
1457     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1458         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1459                s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1460                s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1461                s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1462 }
1463
1464 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra)
1465 {
1466     int i;
1467
1468     for (i = 0; i < 64; i++) {
1469         int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1470         int v = get_bits(&s->gb, 8);
1471         if (v == 0) {
1472             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1473             return -1;
1474         }
1475         if (intra && i == 0 && v != 8) {
1476             av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
1477             v = 8; // needed by pink.mpg / issue1046
1478         }
1479         matrix0[j] = v;
1480         if (matrix1)
1481             matrix1[j] = v;
1482     }
1483     return 0;
1484 }
1485
1486 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1487 {
1488     av_dlog(s->avctx, "matrix extension\n");
1489
1490     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1491     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1492     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL           , 1);
1493     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL           , 0);
1494 }
1495
1496 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1497 {
1498     MpegEncContext *s = &s1->mpeg_enc_ctx;
1499
1500     s->full_pel[0] = s->full_pel[1] = 0;
1501     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1502     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1503     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1504     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1505     if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1506         av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1507         if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1508             if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1509                 s->pict_type = AV_PICTURE_TYPE_I;
1510             else
1511                 s->pict_type = AV_PICTURE_TYPE_P;
1512         } else
1513             s->pict_type = AV_PICTURE_TYPE_B;
1514         s->current_picture.f.pict_type = s->pict_type;
1515         s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1516     }
1517     s->intra_dc_precision         = get_bits(&s->gb, 2);
1518     s->picture_structure          = get_bits(&s->gb, 2);
1519     s->top_field_first            = get_bits1(&s->gb);
1520     s->frame_pred_frame_dct       = get_bits1(&s->gb);
1521     s->concealment_motion_vectors = get_bits1(&s->gb);
1522     s->q_scale_type               = get_bits1(&s->gb);
1523     s->intra_vlc_format           = get_bits1(&s->gb);
1524     s->alternate_scan             = get_bits1(&s->gb);
1525     s->repeat_first_field         = get_bits1(&s->gb);
1526     s->chroma_420_type            = get_bits1(&s->gb);
1527     s->progressive_frame          = get_bits1(&s->gb);
1528
1529     if (s->progressive_sequence && !s->progressive_frame) {
1530         s->progressive_frame = 1;
1531         av_log(s->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
1532     }
1533
1534     if (s->picture_structure == 0 || (s->progressive_frame && s->picture_structure != PICT_FRAME)) {
1535         av_log(s->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s->picture_structure);
1536         s->picture_structure = PICT_FRAME;
1537     }
1538
1539     if (s->progressive_sequence && !s->frame_pred_frame_dct) {
1540         av_log(s->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
1541     }
1542
1543     if (s->picture_structure == PICT_FRAME) {
1544         s->first_field = 0;
1545         s->v_edge_pos  = 16 * s->mb_height;
1546     } else {
1547         s->first_field ^= 1;
1548         s->v_edge_pos   = 8 * s->mb_height;
1549         memset(s->mbskip_table, 0, s->mb_stride * s->mb_height);
1550     }
1551
1552     if (s->alternate_scan) {
1553         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1554         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1555     } else {
1556         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1557         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1558     }
1559
1560     /* composite display not parsed */
1561     av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1562     av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1563     av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1564     av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1565     av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1566     av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1567     av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1568     av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1569     av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1570 }
1571
1572 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1573 {
1574     AVCodecContext *avctx = s->avctx;
1575     Mpeg1Context *s1 = (Mpeg1Context*)s;
1576
1577     /* start frame decoding */
1578     if (s->first_field || s->picture_structure == PICT_FRAME) {
1579         AVFrameSideData *pan_scan;
1580
1581         if (ff_MPV_frame_start(s, avctx) < 0)
1582             return -1;
1583
1584         ff_mpeg_er_frame_start(s);
1585
1586         /* first check if we must repeat the frame */
1587         s->current_picture_ptr->f.repeat_pict = 0;
1588         if (s->repeat_first_field) {
1589             if (s->progressive_sequence) {
1590                 if (s->top_field_first)
1591                     s->current_picture_ptr->f.repeat_pict = 4;
1592                 else
1593                     s->current_picture_ptr->f.repeat_pict = 2;
1594             } else if (s->progressive_frame) {
1595                 s->current_picture_ptr->f.repeat_pict = 1;
1596             }
1597         }
1598
1599         pan_scan = av_frame_new_side_data(&s->current_picture_ptr->f,
1600                                           AV_FRAME_DATA_PANSCAN,
1601                                           sizeof(s1->pan_scan));
1602         if (!pan_scan)
1603             return AVERROR(ENOMEM);
1604         memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1605
1606         if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1607             ff_thread_finish_setup(avctx);
1608     } else { // second field
1609         int i;
1610
1611         if (!s->current_picture_ptr) {
1612             av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1613             return -1;
1614         }
1615
1616         if (s->avctx->hwaccel &&
1617             (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1618             if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1619                 av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode first field\n");
1620         }
1621
1622         for (i = 0; i < 4; i++) {
1623             s->current_picture.f.data[i] = s->current_picture_ptr->f.data[i];
1624             if (s->picture_structure == PICT_BOTTOM_FIELD) {
1625                 s->current_picture.f.data[i] += s->current_picture_ptr->f.linesize[i];
1626             }
1627         }
1628     }
1629
1630     if (avctx->hwaccel) {
1631         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1632             return -1;
1633     }
1634
1635 // MPV_frame_start will call this function too,
1636 // but we need to call it on every field
1637     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1638         if (ff_xvmc_field_start(s, avctx) < 0)
1639             return -1;
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 field_pic   = s->picture_structure != PICT_FRAME;
1658
1659     s->resync_mb_x =
1660     s->resync_mb_y = -1;
1661
1662     assert(mb_y < s->mb_height);
1663
1664     init_get_bits(&s->gb, *buf, buf_size * 8);
1665
1666     ff_mpeg1_clean_buffers(s);
1667     s->interlaced_dct = 0;
1668
1669     s->qscale = get_qscale(s);
1670
1671     if (s->qscale == 0) {
1672         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1673         return -1;
1674     }
1675
1676     /* extra slice info */
1677     while (get_bits1(&s->gb) != 0) {
1678         skip_bits(&s->gb, 8);
1679     }
1680
1681     s->mb_x = 0;
1682
1683     if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1684         skip_bits1(&s->gb);
1685     } else {
1686         while (get_bits_left(&s->gb) > 0) {
1687             int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1688             if (code < 0) {
1689                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1690                 return -1;
1691             }
1692             if (code >= 33) {
1693                 if (code == 33) {
1694                     s->mb_x += 33;
1695                 }
1696                 /* otherwise, stuffing, nothing to do */
1697             } else {
1698                 s->mb_x += code;
1699                 break;
1700             }
1701         }
1702     }
1703
1704     if (s->mb_x >= (unsigned)s->mb_width) {
1705         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1706         return -1;
1707     }
1708
1709     if (avctx->hwaccel) {
1710         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1711         int start_code = -1;
1712         buf_end = avpriv_mpv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1713         if (buf_end < *buf + buf_size)
1714             buf_end -= 4;
1715         s->mb_y = mb_y;
1716         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1717             return DECODE_SLICE_ERROR;
1718         *buf = buf_end;
1719         return DECODE_SLICE_OK;
1720     }
1721
1722     s->resync_mb_x = s->mb_x;
1723     s->resync_mb_y = s->mb_y = mb_y;
1724     s->mb_skip_run = 0;
1725     ff_init_block_index(s);
1726
1727     if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1728         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1729              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",
1730                     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],
1731                     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")),
1732                     s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1733                     s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1734                     s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1735         }
1736     }
1737
1738     for (;;) {
1739         // If 1, we memcpy blocks in xvmcvideo.
1740         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1741             ff_xvmc_init_block(s); // set s->block
1742
1743         if (mpeg_decode_mb(s, s->block) < 0)
1744             return -1;
1745
1746         if (s->current_picture.motion_val[0] && !s->encoding) { // note motion_val is normally NULL unless we want to extract the MVs
1747             const int wrap = s->b8_stride;
1748             int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1749             int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1750             int motion_x, motion_y, dir, i;
1751
1752             for (i = 0; i < 2; i++) {
1753                 for (dir = 0; dir < 2; dir++) {
1754                     if (s->mb_intra || (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1755                         motion_x = motion_y = 0;
1756                     } else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1757                         motion_x = s->mv[dir][0][0];
1758                         motion_y = s->mv[dir][0][1];
1759                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1760                         motion_x = s->mv[dir][i][0];
1761                         motion_y = s->mv[dir][i][1];
1762                     }
1763
1764                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1765                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1766                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1767                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1768                     s->current_picture.ref_index [dir][b8_xy    ] =
1769                     s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1770                     assert(s->field_select[dir][i] == 0 || s->field_select[dir][i] == 1);
1771                 }
1772                 xy += wrap;
1773                 b8_xy +=2;
1774             }
1775         }
1776
1777         s->dest[0] += 16;
1778         s->dest[1] += 16 >> s->chroma_x_shift;
1779         s->dest[2] += 16 >> s->chroma_x_shift;
1780
1781         ff_MPV_decode_mb(s, s->block);
1782
1783         if (++s->mb_x >= s->mb_width) {
1784             const int mb_size = 16;
1785
1786             ff_mpeg_draw_horiz_band(s, mb_size*(s->mb_y >> field_pic), mb_size);
1787             ff_MPV_report_decode_progress(s);
1788
1789             s->mb_x = 0;
1790             s->mb_y += 1 << field_pic;
1791
1792             if (s->mb_y >= s->mb_height) {
1793                 int left   = get_bits_left(&s->gb);
1794                 int is_d10 = s->chroma_format == 2 && s->pict_type == AV_PICTURE_TYPE_I && avctx->profile == 0 && avctx->level == 5
1795                              && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1796                              && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1797
1798                 if (left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1799                     || ((avctx->err_recognition & AV_EF_BUFFER) && left > 8)) {
1800                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1801                     return -1;
1802                 } else
1803                     goto eos;
1804             }
1805
1806             ff_init_block_index(s);
1807         }
1808
1809         /* skip mb handling */
1810         if (s->mb_skip_run == -1) {
1811             /* read increment again */
1812             s->mb_skip_run = 0;
1813             for (;;) {
1814                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1815                 if (code < 0) {
1816                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1817                     return -1;
1818                 }
1819                 if (code >= 33) {
1820                     if (code == 33) {
1821                         s->mb_skip_run += 33;
1822                     } else if (code == 35) {
1823                         if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1824                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1825                             return -1;
1826                         }
1827                         goto eos; /* end of slice */
1828                     }
1829                     /* otherwise, stuffing, nothing to do */
1830                 } else {
1831                     s->mb_skip_run += code;
1832                     break;
1833                 }
1834             }
1835             if (s->mb_skip_run) {
1836                 int i;
1837                 if (s->pict_type == AV_PICTURE_TYPE_I) {
1838                     av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1839                     return -1;
1840                 }
1841
1842                 /* skip mb */
1843                 s->mb_intra = 0;
1844                 for (i = 0; i < 12; i++)
1845                     s->block_last_index[i] = -1;
1846                 if (s->picture_structure == PICT_FRAME)
1847                     s->mv_type = MV_TYPE_16X16;
1848                 else
1849                     s->mv_type = MV_TYPE_FIELD;
1850                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1851                     /* if P type, zero motion vector is implied */
1852                     s->mv_dir             = MV_DIR_FORWARD;
1853                     s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1854                     s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1855                     s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1856                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1857                 } else {
1858                     /* if B type, reuse previous vectors and directions */
1859                     s->mv[0][0][0] = s->last_mv[0][0][0];
1860                     s->mv[0][0][1] = s->last_mv[0][0][1];
1861                     s->mv[1][0][0] = s->last_mv[1][0][0];
1862                     s->mv[1][0][1] = s->last_mv[1][0][1];
1863                 }
1864             }
1865         }
1866     }
1867 eos: // end of slice
1868     *buf += (get_bits_count(&s->gb)-1)/8;
1869     av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1870     return 0;
1871 }
1872
1873 static int slice_decode_thread(AVCodecContext *c, void *arg)
1874 {
1875     MpegEncContext *s   = *(void**)arg;
1876     const uint8_t *buf  = s->gb.buffer;
1877     int mb_y            = s->start_mb_y;
1878     const int field_pic = s->picture_structure != PICT_FRAME;
1879
1880     s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1881
1882     for (;;) {
1883         uint32_t start_code;
1884         int ret;
1885
1886         ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1887         emms_c();
1888         av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1889                 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1890                 s->start_mb_y, s->end_mb_y, s->er.error_count);
1891         if (ret < 0) {
1892             if (c->err_recognition & AV_EF_EXPLODE)
1893                 return ret;
1894             if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1895                 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);
1896         } else {
1897             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);
1898         }
1899
1900         if (s->mb_y == s->end_mb_y)
1901             return 0;
1902
1903         start_code = -1;
1904         buf = avpriv_mpv_find_start_code(buf, s->gb.buffer_end, &start_code);
1905         mb_y= (start_code - SLICE_MIN_START_CODE) << field_pic;
1906         if (s->picture_structure == PICT_BOTTOM_FIELD)
1907             mb_y++;
1908         if (mb_y < 0 || mb_y >= s->end_mb_y)
1909             return -1;
1910     }
1911 }
1912
1913 /**
1914  * Handle slice ends.
1915  * @return 1 if it seems to be the last slice
1916  */
1917 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1918 {
1919     Mpeg1Context *s1 = avctx->priv_data;
1920     MpegEncContext *s = &s1->mpeg_enc_ctx;
1921
1922     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1923         return 0;
1924
1925     if (s->avctx->hwaccel) {
1926         if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1927             av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1928     }
1929
1930     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1931         ff_xvmc_field_end(s);
1932
1933     /* end of slice reached */
1934     if (/*s->mb_y << field_pic == s->mb_height &&*/ !s->first_field) {
1935         /* end of image */
1936
1937         ff_er_frame_end(&s->er);
1938
1939         ff_MPV_frame_end(s);
1940
1941         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
1942             int ret = av_frame_ref(pict, &s->current_picture_ptr->f);
1943             if (ret < 0)
1944                 return ret;
1945             ff_print_debug_info(s, s->current_picture_ptr);
1946         } else {
1947             if (avctx->active_thread_type & FF_THREAD_FRAME)
1948                 s->picture_number++;
1949             /* latency of 1 frame for I- and P-frames */
1950             /* XXX: use another variable than picture_number */
1951             if (s->last_picture_ptr != NULL) {
1952                 int ret = av_frame_ref(pict, &s->last_picture_ptr->f);
1953                 if (ret < 0)
1954                     return ret;
1955                 ff_print_debug_info(s, s->last_picture_ptr);
1956             }
1957         }
1958
1959         return 1;
1960     } else {
1961         return 0;
1962     }
1963 }
1964
1965 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1966                                  const uint8_t *buf, int buf_size)
1967 {
1968     Mpeg1Context *s1 = avctx->priv_data;
1969     MpegEncContext *s = &s1->mpeg_enc_ctx;
1970     int width, height;
1971     int i, v, j;
1972
1973     init_get_bits(&s->gb, buf, buf_size*8);
1974
1975     width  = get_bits(&s->gb, 12);
1976     height = get_bits(&s->gb, 12);
1977     if (width <= 0 || height <= 0)
1978         return -1;
1979     s->aspect_ratio_info = get_bits(&s->gb, 4);
1980     if (s->aspect_ratio_info == 0) {
1981         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1982         if (avctx->err_recognition & AV_EF_BITSTREAM)
1983             return -1;
1984     }
1985     s->frame_rate_index = get_bits(&s->gb, 4);
1986     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1987         return -1;
1988     s->bit_rate = get_bits(&s->gb, 18) * 400;
1989     if (get_bits1(&s->gb) == 0) /* marker */
1990         return -1;
1991     s->width  = width;
1992     s->height = height;
1993
1994     s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
1995     skip_bits(&s->gb, 1);
1996
1997     /* get matrix */
1998     if (get_bits1(&s->gb)) {
1999         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2000     } else {
2001         for (i = 0; i < 64; i++) {
2002             j = s->dsp.idct_permutation[i];
2003             v = ff_mpeg1_default_intra_matrix[i];
2004             s->intra_matrix[j]        = v;
2005             s->chroma_intra_matrix[j] = v;
2006         }
2007     }
2008     if (get_bits1(&s->gb)) {
2009         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2010     } else {
2011         for (i = 0; i < 64; i++) {
2012             int j = s->dsp.idct_permutation[i];
2013             v = ff_mpeg1_default_non_intra_matrix[i];
2014             s->inter_matrix[j]        = v;
2015             s->chroma_inter_matrix[j] = v;
2016         }
2017     }
2018
2019     if (show_bits(&s->gb, 23) != 0) {
2020         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2021         return -1;
2022     }
2023
2024     /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2025     s->progressive_sequence = 1;
2026     s->progressive_frame    = 1;
2027     s->picture_structure    = PICT_FRAME;
2028     s->frame_pred_frame_dct = 1;
2029     s->chroma_format        = 1;
2030     s->codec_id             = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2031     s->out_format           = FMT_MPEG1;
2032     s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2033     if (s->flags & CODEC_FLAG_LOW_DELAY)
2034         s->low_delay = 1;
2035
2036     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2037         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2038                s->avctx->rc_buffer_size, s->bit_rate);
2039
2040     return 0;
2041 }
2042
2043 static int vcr2_init_sequence(AVCodecContext *avctx)
2044 {
2045     Mpeg1Context *s1 = avctx->priv_data;
2046     MpegEncContext *s = &s1->mpeg_enc_ctx;
2047     int i, v;
2048
2049     /* start new MPEG-1 context decoding */
2050     s->out_format = FMT_MPEG1;
2051     if (s1->mpeg_enc_ctx_allocated) {
2052         ff_MPV_common_end(s);
2053     }
2054     s->width  = avctx->coded_width;
2055     s->height = avctx->coded_height;
2056     avctx->has_b_frames = 0; // true?
2057     s->low_delay = 1;
2058
2059     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2060     avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2061
2062     if (avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel ||
2063         s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)
2064         if (avctx->idct_algo == FF_IDCT_AUTO)
2065             avctx->idct_algo = FF_IDCT_SIMPLE;
2066
2067     if (ff_MPV_common_init(s) < 0)
2068         return -1;
2069     exchange_uv(s); // common init reset pblocks, so we swap them here
2070     s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2071     s1->mpeg_enc_ctx_allocated = 1;
2072
2073     for (i = 0; i < 64; i++) {
2074         int j = s->dsp.idct_permutation[i];
2075         v = ff_mpeg1_default_intra_matrix[i];
2076         s->intra_matrix[j]        = v;
2077         s->chroma_intra_matrix[j] = v;
2078
2079         v = ff_mpeg1_default_non_intra_matrix[i];
2080         s->inter_matrix[j]        = v;
2081         s->chroma_inter_matrix[j] = v;
2082     }
2083
2084     s->progressive_sequence  = 1;
2085     s->progressive_frame     = 1;
2086     s->picture_structure     = PICT_FRAME;
2087     s->frame_pred_frame_dct  = 1;
2088     s->chroma_format         = 1;
2089     s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2090     s1->save_width           = s->width;
2091     s1->save_height          = s->height;
2092     s1->save_progressive_seq = s->progressive_sequence;
2093     return 0;
2094 }
2095
2096
2097 static void mpeg_decode_user_data(AVCodecContext *avctx,
2098                                   const uint8_t *p, int buf_size)
2099 {
2100     const uint8_t *buf_end = p + buf_size;
2101
2102     /* we parse the DTG active format information */
2103     if (buf_end - p >= 5 &&
2104         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2105         int flags = p[4];
2106         p += 5;
2107         if (flags & 0x80) {
2108             /* skip event id */
2109             p += 2;
2110         }
2111         if (flags & 0x40) {
2112             if (buf_end - p < 1)
2113                 return;
2114             avctx->dtg_active_format = p[0] & 0x0f;
2115         }
2116     }
2117 }
2118
2119 static void mpeg_decode_gop(AVCodecContext *avctx,
2120                             const uint8_t *buf, int buf_size)
2121 {
2122     Mpeg1Context *s1  = avctx->priv_data;
2123     MpegEncContext *s = &s1->mpeg_enc_ctx;
2124
2125     int time_code_hours, time_code_minutes;
2126     int time_code_seconds, time_code_pictures;
2127     int broken_link;
2128
2129     init_get_bits(&s->gb, buf, buf_size*8);
2130
2131     skip_bits1(&s->gb); /* drop_frame_flag */
2132
2133     time_code_hours   = get_bits(&s->gb, 5);
2134     time_code_minutes = get_bits(&s->gb, 6);
2135     skip_bits1(&s->gb); // marker bit
2136     time_code_seconds  = get_bits(&s->gb, 6);
2137     time_code_pictures = get_bits(&s->gb, 6);
2138
2139     s1->closed_gop = get_bits1(&s->gb);
2140     /*broken_link indicate that after editing the
2141       reference frames of the first B-Frames after GOP I-Frame
2142       are missing (open gop)*/
2143     broken_link = get_bits1(&s->gb);
2144
2145     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2146         av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2147                time_code_hours, time_code_minutes, time_code_seconds,
2148                time_code_pictures, s1->closed_gop, broken_link);
2149 }
2150 /**
2151  * Find the end of the current frame in the bitstream.
2152  * @return the position of the first byte of the next frame, or -1
2153  */
2154 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2155 {
2156     int i;
2157     uint32_t state = pc->state;
2158
2159     /* EOF considered as end of frame */
2160     if (buf_size == 0)
2161         return 0;
2162
2163 /*
2164  0  frame start         -> 1/4
2165  1  first_SEQEXT        -> 0/2
2166  2  first field start   -> 3/0
2167  3  second_SEQEXT       -> 2/0
2168  4  searching end
2169 */
2170
2171     for (i = 0; i < buf_size; i++) {
2172         assert(pc->frame_start_found >= 0 && pc->frame_start_found <= 4);
2173         if (pc->frame_start_found & 1) {
2174             if (state == EXT_START_CODE && (buf[i] & 0xF0) != 0x80)
2175                 pc->frame_start_found--;
2176             else if (state == EXT_START_CODE + 2) {
2177                 if ((buf[i] & 3) == 3)
2178                     pc->frame_start_found = 0;
2179                 else
2180                     pc->frame_start_found = (pc->frame_start_found + 1) & 3;
2181             }
2182             state++;
2183         } else {
2184             i = avpriv_mpv_find_start_code(buf + i, buf + buf_size, &state) - buf - 1;
2185             if (pc->frame_start_found == 0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE) {
2186                 i++;
2187                 pc->frame_start_found = 4;
2188             }
2189             if (state == SEQ_END_CODE) {
2190                 pc->frame_start_found = 0;
2191                 pc->state=-1;
2192                 return i+1;
2193             }
2194             if (pc->frame_start_found == 2 && state == SEQ_START_CODE)
2195                 pc->frame_start_found = 0;
2196             if (pc->frame_start_found  < 4 && state == EXT_START_CODE)
2197                 pc->frame_start_found++;
2198             if (pc->frame_start_found == 4 && (state & 0xFFFFFF00) == 0x100) {
2199                 if (state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE) {
2200                     pc->frame_start_found = 0;
2201                     pc->state             = -1;
2202                     return i - 3;
2203                 }
2204             }
2205             if (pc->frame_start_found == 0 && s && state == PICTURE_START_CODE) {
2206                 ff_fetch_timestamp(s, i - 3, 1);
2207             }
2208         }
2209     }
2210     pc->state = state;
2211     return END_NOT_FOUND;
2212 }
2213
2214 static int decode_chunks(AVCodecContext *avctx,
2215                          AVFrame *picture, int *got_output,
2216                          const uint8_t *buf, int buf_size)
2217 {
2218     Mpeg1Context *s = avctx->priv_data;
2219     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2220     const uint8_t *buf_ptr = buf;
2221     const uint8_t *buf_end = buf + buf_size;
2222     int ret, input_size;
2223     int last_code = 0;
2224
2225     for (;;) {
2226         /* find next start code */
2227         uint32_t start_code = -1;
2228         buf_ptr = avpriv_mpv_find_start_code(buf_ptr, buf_end, &start_code);
2229         if (start_code > 0x1ff) {
2230             if (s2->pict_type != AV_PICTURE_TYPE_B || avctx->skip_frame <= AVDISCARD_DEFAULT) {
2231                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2232                     int i;
2233
2234                     avctx->execute(avctx, slice_decode_thread,  &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
2235                     for (i = 0; i < s->slice_count; i++)
2236                         s2->er.error_count += s2->thread_context[i]->er.error_count;
2237                 }
2238
2239                 if (CONFIG_MPEG_VDPAU_DECODER && avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)
2240                     ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2241
2242                 ret = slice_end(avctx, picture);
2243                 if (ret < 0)
2244                     return ret;
2245                 else if (ret) {
2246                     if (s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2247                         *got_output = 1;
2248                 }
2249             }
2250             s2->pict_type = 0;
2251             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2252         }
2253
2254         input_size = buf_end - buf_ptr;
2255
2256         if (avctx->debug & FF_DEBUG_STARTCODE) {
2257             av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2258         }
2259
2260         /* prepare data for next start code */
2261         switch (start_code) {
2262         case SEQ_START_CODE:
2263             if (last_code == 0) {
2264                 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2265                 s->sync=1;
2266             } else {
2267                 av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2268                 if (avctx->err_recognition & AV_EF_EXPLODE)
2269                     return AVERROR_INVALIDDATA;
2270             }
2271             break;
2272
2273         case PICTURE_START_CODE:
2274             if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) && s->slice_count) {
2275                 int i;
2276
2277                 avctx->execute(avctx, slice_decode_thread,
2278                                s2->thread_context, NULL,
2279                                s->slice_count, sizeof(void*));
2280                 for (i = 0; i < s->slice_count; i++)
2281                     s2->er.error_count += s2->thread_context[i]->er.error_count;
2282                 s->slice_count = 0;
2283             }
2284             if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2285                 ret = mpeg_decode_postinit(avctx);
2286                 if (ret < 0) {
2287                     av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
2288                     return ret;
2289                 }
2290
2291                 /* we have a complete image: we try to decompress it */
2292                 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2293                     s2->pict_type = 0;
2294                 s2->first_slice = 1;
2295                 last_code = PICTURE_START_CODE;
2296             } else {
2297                 av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
2298                 if (avctx->err_recognition & AV_EF_EXPLODE)
2299                     return AVERROR_INVALIDDATA;
2300             }
2301             break;
2302         case EXT_START_CODE:
2303             init_get_bits(&s2->gb, buf_ptr, input_size*8);
2304
2305             switch (get_bits(&s2->gb, 4)) {
2306             case 0x1:
2307                 if (last_code == 0) {
2308                 mpeg_decode_sequence_extension(s);
2309                 } else {
2310                     av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
2311                     if (avctx->err_recognition & AV_EF_EXPLODE)
2312                         return AVERROR_INVALIDDATA;
2313                 }
2314                 break;
2315             case 0x2:
2316                 mpeg_decode_sequence_display_extension(s);
2317                 break;
2318             case 0x3:
2319                 mpeg_decode_quant_matrix_extension(s2);
2320                 break;
2321             case 0x7:
2322                 mpeg_decode_picture_display_extension(s);
2323                 break;
2324             case 0x8:
2325                 if (last_code == PICTURE_START_CODE) {
2326                     mpeg_decode_picture_coding_extension(s);
2327                 } else {
2328                     av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
2329                     if (avctx->err_recognition & AV_EF_EXPLODE)
2330                         return AVERROR_INVALIDDATA;
2331                 }
2332                 break;
2333             }
2334             break;
2335         case USER_START_CODE:
2336             mpeg_decode_user_data(avctx, buf_ptr, input_size);
2337             break;
2338         case GOP_START_CODE:
2339             if (last_code == 0) {
2340                 s2->first_field=0;
2341                 mpeg_decode_gop(avctx, buf_ptr, input_size);
2342                 s->sync=1;
2343             } else {
2344                 av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
2345                 if (avctx->err_recognition & AV_EF_EXPLODE)
2346                     return AVERROR_INVALIDDATA;
2347             }
2348             break;
2349         default:
2350             if (start_code >= SLICE_MIN_START_CODE &&
2351                 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2352                 const int field_pic = s2->picture_structure != PICT_FRAME;
2353                 int mb_y = (start_code - SLICE_MIN_START_CODE) << field_pic;
2354                 last_code = SLICE_MIN_START_CODE;
2355
2356                 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2357                     mb_y++;
2358
2359                 if (mb_y >= s2->mb_height) {
2360                     av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2361                     return -1;
2362                 }
2363
2364                 if (s2->last_picture_ptr == NULL) {
2365                 /* Skip B-frames if we do not have reference frames and gop is not closed */
2366                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
2367                         if (!s->closed_gop)
2368                             break;
2369                     }
2370                 }
2371                 if (s2->pict_type == AV_PICTURE_TYPE_I)
2372                     s->sync=1;
2373                 if (s2->next_picture_ptr == NULL) {
2374                 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2375                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) break;
2376                 }
2377                 if ((avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type == AV_PICTURE_TYPE_B) ||
2378                     (avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type != AV_PICTURE_TYPE_I) ||
2379                      avctx->skip_frame >= AVDISCARD_ALL)
2380                     break;
2381
2382                 if (!s->mpeg_enc_ctx_allocated)
2383                     break;
2384
2385                 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2386                     if (mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2387                         break;
2388                 }
2389
2390                 if (!s2->pict_type) {
2391                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2392                     if (avctx->err_recognition & AV_EF_EXPLODE)
2393                         return AVERROR_INVALIDDATA;
2394                     break;
2395                 }
2396
2397                 if (s2->first_slice) {
2398                     s2->first_slice = 0;
2399                     if (mpeg_field_start(s2, buf, buf_size) < 0)
2400                         return -1;
2401                 }
2402                 if (!s2->current_picture_ptr) {
2403                     av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2404                     return AVERROR_INVALIDDATA;
2405                 }
2406
2407                 if (avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU) {
2408                     s->slice_count++;
2409                     break;
2410                 }
2411
2412                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2413                     int threshold = (s2->mb_height * s->slice_count +
2414                                      s2->slice_context_count / 2) /
2415                                     s2->slice_context_count;
2416                     if (threshold <= mb_y) {
2417                         MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2418
2419                         thread_context->start_mb_y = mb_y;
2420                         thread_context->end_mb_y   = s2->mb_height;
2421                         if (s->slice_count) {
2422                             s2->thread_context[s->slice_count-1]->end_mb_y = mb_y;
2423                             ret = ff_update_duplicate_context(thread_context,
2424                                                               s2);
2425                             if (ret < 0)
2426                                 return ret;
2427                         }
2428                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2429                         s->slice_count++;
2430                     }
2431                     buf_ptr += 2; // FIXME add minimum number of bytes per slice
2432                 } else {
2433                     ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2434                     emms_c();
2435
2436                     if (ret < 0) {
2437                         if (avctx->err_recognition & AV_EF_EXPLODE)
2438                             return ret;
2439                         if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2440                             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);
2441                     } else {
2442                         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);
2443                     }
2444                 }
2445             }
2446             break;
2447         }
2448     }
2449 }
2450
2451 static int mpeg_decode_frame(AVCodecContext *avctx,
2452                              void *data, int *got_output,
2453                              AVPacket *avpkt)
2454 {
2455     const uint8_t *buf = avpkt->data;
2456     int buf_size = avpkt->size;
2457     Mpeg1Context *s = avctx->priv_data;
2458     AVFrame *picture = data;
2459     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2460     av_dlog(avctx, "fill_buffer\n");
2461
2462     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2463         /* special case for last picture */
2464         if (s2->low_delay == 0 && s2->next_picture_ptr) {
2465             int ret = av_frame_ref(picture, &s2->next_picture_ptr->f);
2466             if (ret < 0)
2467                 return ret;
2468
2469             s2->next_picture_ptr = NULL;
2470
2471             *got_output = 1;
2472         }
2473         return buf_size;
2474     }
2475
2476     if (s2->flags & CODEC_FLAG_TRUNCATED) {
2477         int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2478
2479         if (ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0)
2480             return buf_size;
2481     }
2482
2483     if (s->mpeg_enc_ctx_allocated == 0 && avctx->codec_tag == AV_RL32("VCR2"))
2484         vcr2_init_sequence(avctx);
2485
2486     s->slice_count = 0;
2487
2488     if (avctx->extradata && !s->extradata_decoded) {
2489         int ret = decode_chunks(avctx, picture, got_output, avctx->extradata, avctx->extradata_size);
2490         s->extradata_decoded = 1;
2491         if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
2492             return ret;
2493     }
2494
2495     return decode_chunks(avctx, picture, got_output, buf, buf_size);
2496 }
2497
2498
2499 static void flush(AVCodecContext *avctx)
2500 {
2501     Mpeg1Context *s = avctx->priv_data;
2502
2503     s->sync=0;
2504     s->closed_gop = 0;
2505
2506     ff_mpeg_flush(avctx);
2507 }
2508
2509 static int mpeg_decode_end(AVCodecContext *avctx)
2510 {
2511     Mpeg1Context *s = avctx->priv_data;
2512
2513     if (s->mpeg_enc_ctx_allocated)
2514         ff_MPV_common_end(&s->mpeg_enc_ctx);
2515     return 0;
2516 }
2517
2518 static const AVProfile mpeg2_video_profiles[] = {
2519     { FF_PROFILE_MPEG2_422,          "4:2:2"              },
2520     { FF_PROFILE_MPEG2_HIGH,         "High"               },
2521     { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
2522     { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
2523     { FF_PROFILE_MPEG2_MAIN,         "Main"               },
2524     { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
2525     { FF_PROFILE_RESERVED,           "Reserved"           },
2526     { FF_PROFILE_RESERVED,           "Reserved"           },
2527     { FF_PROFILE_UNKNOWN },
2528 };
2529
2530
2531 AVCodec ff_mpeg1video_decoder = {
2532     .name                  = "mpeg1video",
2533     .type                  = AVMEDIA_TYPE_VIDEO,
2534     .id                    = AV_CODEC_ID_MPEG1VIDEO,
2535     .priv_data_size        = sizeof(Mpeg1Context),
2536     .init                  = mpeg_decode_init,
2537     .close                 = mpeg_decode_end,
2538     .decode                = mpeg_decode_frame,
2539     .capabilities          = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2540                              CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2541                              CODEC_CAP_SLICE_THREADS,
2542     .flush                 = flush,
2543     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2544     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2545 };
2546
2547 AVCodec ff_mpeg2video_decoder = {
2548     .name           = "mpeg2video",
2549     .type           = AVMEDIA_TYPE_VIDEO,
2550     .id             = AV_CODEC_ID_MPEG2VIDEO,
2551     .priv_data_size = sizeof(Mpeg1Context),
2552     .init           = mpeg_decode_init,
2553     .close          = mpeg_decode_end,
2554     .decode         = mpeg_decode_frame,
2555     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2556                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2557                       CODEC_CAP_SLICE_THREADS,
2558     .flush          = flush,
2559     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2560     .profiles       = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2561 };
2562
2563 #if CONFIG_MPEG_XVMC_DECODER
2564 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2565 {
2566     if (avctx->active_thread_type & FF_THREAD_SLICE)
2567         return -1;
2568     if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2569         return -1;
2570     if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2571         av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2572     }
2573     mpeg_decode_init(avctx);
2574
2575     avctx->pix_fmt           = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2576     avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2577
2578     return 0;
2579 }
2580
2581 AVCodec ff_mpeg_xvmc_decoder = {
2582     .name           = "mpegvideo_xvmc",
2583     .type           = AVMEDIA_TYPE_VIDEO,
2584     .id             = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2585     .priv_data_size = sizeof(Mpeg1Context),
2586     .init           = mpeg_mc_decode_init,
2587     .close          = mpeg_decode_end,
2588     .decode         = mpeg_decode_frame,
2589     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2590                       CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2591     .flush          = flush,
2592     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2593 };
2594
2595 #endif
2596
2597 #if CONFIG_MPEG_VDPAU_DECODER
2598 AVCodec ff_mpeg_vdpau_decoder = {
2599     .name           = "mpegvideo_vdpau",
2600     .type           = AVMEDIA_TYPE_VIDEO,
2601     .id             = AV_CODEC_ID_MPEG2VIDEO,
2602     .priv_data_size = sizeof(Mpeg1Context),
2603     .init           = mpeg_decode_init,
2604     .close          = mpeg_decode_end,
2605     .decode         = mpeg_decode_frame,
2606     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2607                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2608     .flush          = flush,
2609     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2610 };
2611 #endif
2612
2613 #if CONFIG_MPEG1_VDPAU_DECODER
2614 AVCodec ff_mpeg1_vdpau_decoder = {
2615     .name           = "mpeg1video_vdpau",
2616     .type           = AVMEDIA_TYPE_VIDEO,
2617     .id             = AV_CODEC_ID_MPEG1VIDEO,
2618     .priv_data_size = sizeof(Mpeg1Context),
2619     .init           = mpeg_decode_init,
2620     .close          = mpeg_decode_end,
2621     .decode         = mpeg_decode_frame,
2622     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2623                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2624     .flush          = flush,
2625     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2626 };
2627 #endif