Merge remote-tracking branch 'qatar/master'
[ffmpeg.git] / libavcodec / mpeg12.c
1 /*
2  * MPEG-1/2 decoder
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22
23 /**
24  * @file
25  * MPEG-1/2 decoder
26  */
27
28 #define UNCHECKED_BITSTREAM_READER 1
29
30 //#define DEBUG
31 #include "internal.h"
32 #include "avcodec.h"
33 #include "dsputil.h"
34 #include "mpegvideo.h"
35 #include "libavutil/avassert.h"
36
37 #include "mpeg12.h"
38 #include "mpeg12data.h"
39 #include "mpeg12decdata.h"
40 #include "bytestream.h"
41 #include "vdpau_internal.h"
42 #include "xvmc_internal.h"
43 #include "thread.h"
44
45 //#undef NDEBUG
46 //#include <assert.h>
47
48
49 #define MV_VLC_BITS 9
50 #define MBINCR_VLC_BITS 9
51 #define MB_PAT_VLC_BITS 9
52 #define MB_PTYPE_VLC_BITS 6
53 #define MB_BTYPE_VLC_BITS 6
54
55 static VLC mv_vlc;
56
57 /* as H.263, but only 17 codes */
58 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
59 {
60     int code, sign, val, shift;
61
62     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
63     if (code == 0) {
64         return pred;
65     }
66     if (code < 0) {
67         return 0xffff;
68     }
69
70     sign  = get_bits1(&s->gb);
71     shift = fcode - 1;
72     val   = code;
73     if (shift) {
74         val  = (val - 1) << shift;
75         val |= get_bits(&s->gb, shift);
76         val++;
77     }
78     if (sign)
79         val = -val;
80     val += pred;
81
82     /* modulo decoding */
83     return sign_extend(val, 5 + shift);
84 }
85
86 static inline int mpeg1_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n)
87 {
88     int level, dc, diff, i, j, run;
89     int component;
90     RLTable *rl = &ff_rl_mpeg1;
91     uint8_t * const scantable    = s->intra_scantable.permutated;
92     const uint16_t *quant_matrix = s->intra_matrix;
93     const int qscale             = s->qscale;
94
95     /* DC coefficient */
96     component = (n <= 3 ? 0 : n - 4 + 1);
97     diff = decode_dc(&s->gb, component);
98     if (diff >= 0xffff)
99         return -1;
100     dc  = s->last_dc[component];
101     dc += diff;
102     s->last_dc[component] = dc;
103     block[0] = dc * quant_matrix[0];
104     av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
105     i = 0;
106     {
107         OPEN_READER(re, &s->gb);
108         /* now quantify & encode AC coefficients */
109         for (;;) {
110             UPDATE_CACHE(re, &s->gb);
111             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
112
113             if (level == 127) {
114                 break;
115             } else if (level != 0) {
116                 i += run;
117                 j = scantable[i];
118                 level = (level * qscale * quant_matrix[j]) >> 4;
119                 level = (level - 1) | 1;
120                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
121                 LAST_SKIP_BITS(re, &s->gb, 1);
122             } else {
123                 /* escape */
124                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
125                 UPDATE_CACHE(re, &s->gb);
126                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
127                 if (level == -128) {
128                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
129                 } else if (level == 0) {
130                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
131                 }
132                 i += run;
133                 j = scantable[i];
134                 if (level < 0) {
135                     level = -level;
136                     level = (level * qscale * quant_matrix[j]) >> 4;
137                     level = (level - 1) | 1;
138                     level = -level;
139                 } else {
140                     level = (level * qscale * quant_matrix[j]) >> 4;
141                     level = (level - 1) | 1;
142                 }
143             }
144             if (i > 63) {
145                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
146                 return -1;
147             }
148
149             block[j] = level;
150         }
151         CLOSE_READER(re, &s->gb);
152     }
153     s->block_last_index[n] = i;
154    return 0;
155 }
156
157 int ff_mpeg1_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n)
158 {
159     return mpeg1_decode_block_intra(s, block, n);
160 }
161
162 static inline int mpeg1_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
163 {
164     int level, i, j, run;
165     RLTable *rl = &ff_rl_mpeg1;
166     uint8_t * const scantable    = s->intra_scantable.permutated;
167     const uint16_t *quant_matrix = s->inter_matrix;
168     const int qscale             = s->qscale;
169
170     {
171         OPEN_READER(re, &s->gb);
172         i = -1;
173         // special case for first coefficient, no need to add second VLC table
174         UPDATE_CACHE(re, &s->gb);
175         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
176             level = (3 * qscale * quant_matrix[0]) >> 5;
177             level = (level - 1) | 1;
178             if (GET_CACHE(re, &s->gb) & 0x40000000)
179                 level = -level;
180             block[0] = level;
181             i++;
182             SKIP_BITS(re, &s->gb, 2);
183             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
184                 goto end;
185         }
186         /* now quantify & encode AC coefficients */
187         for (;;) {
188             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
189
190             if (level != 0) {
191                 i += run;
192                 j = scantable[i];
193                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
194                 level = (level - 1) | 1;
195                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
196                 SKIP_BITS(re, &s->gb, 1);
197             } else {
198                 /* escape */
199                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
200                 UPDATE_CACHE(re, &s->gb);
201                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
202                 if (level == -128) {
203                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
204                 } else if (level == 0) {
205                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
206                 }
207                 i += run;
208                 j = scantable[i];
209                 if (level < 0) {
210                     level = -level;
211                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
212                     level = (level - 1) | 1;
213                     level = -level;
214                 } else {
215                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
216                     level = (level - 1) | 1;
217                 }
218             }
219             if (i > 63) {
220                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
221                 return -1;
222             }
223
224             block[j] = level;
225             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
226                 break;
227             UPDATE_CACHE(re, &s->gb);
228         }
229 end:
230         LAST_SKIP_BITS(re, &s->gb, 2);
231         CLOSE_READER(re, &s->gb);
232     }
233     s->block_last_index[n] = i;
234     return 0;
235 }
236
237 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
238 {
239     int level, i, j, run;
240     RLTable *rl = &ff_rl_mpeg1;
241     uint8_t * const scantable = s->intra_scantable.permutated;
242     const int qscale          = s->qscale;
243
244     {
245         OPEN_READER(re, &s->gb);
246         i = -1;
247         // special case for first coefficient, no need to add second VLC table
248         UPDATE_CACHE(re, &s->gb);
249         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
250             level = (3 * qscale) >> 1;
251             level = (level - 1) | 1;
252             if (GET_CACHE(re, &s->gb) & 0x40000000)
253                 level = -level;
254             block[0] = level;
255             i++;
256             SKIP_BITS(re, &s->gb, 2);
257             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
258                 goto end;
259         }
260
261         /* now quantify & encode AC coefficients */
262         for (;;) {
263             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
264
265             if (level != 0) {
266                 i += run;
267                 j = scantable[i];
268                 level = ((level * 2 + 1) * qscale) >> 1;
269                 level = (level - 1) | 1;
270                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
271                 SKIP_BITS(re, &s->gb, 1);
272             } else {
273                 /* escape */
274                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
275                 UPDATE_CACHE(re, &s->gb);
276                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
277                 if (level == -128) {
278                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
279                 } else if (level == 0) {
280                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
281                 }
282                 i += run;
283                 j = scantable[i];
284                 if (level < 0) {
285                     level = -level;
286                     level = ((level * 2 + 1) * qscale) >> 1;
287                     level = (level - 1) | 1;
288                     level = -level;
289                 } else {
290                     level = ((level * 2 + 1) * qscale) >> 1;
291                     level = (level - 1) | 1;
292                 }
293             }
294
295             block[j] = level;
296             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
297                 break;
298             UPDATE_CACHE(re, &s->gb);
299         }
300 end:
301         LAST_SKIP_BITS(re, &s->gb, 2);
302         CLOSE_READER(re, &s->gb);
303     }
304     s->block_last_index[n] = i;
305     return 0;
306 }
307
308
309 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n)
310 {
311     int level, i, j, run;
312     RLTable *rl = &ff_rl_mpeg1;
313     uint8_t * const scantable = s->intra_scantable.permutated;
314     const uint16_t *quant_matrix;
315     const int qscale = s->qscale;
316     int mismatch;
317
318     mismatch = 1;
319
320     {
321         OPEN_READER(re, &s->gb);
322         i = -1;
323         if (n < 4)
324             quant_matrix = s->inter_matrix;
325         else
326             quant_matrix = s->chroma_inter_matrix;
327
328         // special case for first coefficient, no need to add second VLC table
329         UPDATE_CACHE(re, &s->gb);
330         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
331             level= (3 * qscale * quant_matrix[0]) >> 5;
332             if (GET_CACHE(re, &s->gb) & 0x40000000)
333                 level = -level;
334             block[0]  = level;
335             mismatch ^= level;
336             i++;
337             SKIP_BITS(re, &s->gb, 2);
338             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
339                 goto end;
340         }
341
342         /* now quantify & encode AC coefficients */
343         for (;;) {
344             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
345
346             if (level != 0) {
347                 i += run;
348                 j = scantable[i];
349                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
350                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
351                 SKIP_BITS(re, &s->gb, 1);
352             } else {
353                 /* escape */
354                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
355                 UPDATE_CACHE(re, &s->gb);
356                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
357
358                 i += run;
359                 j = scantable[i];
360                 if (level < 0) {
361                     level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
362                     level = -level;
363                 } else {
364                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
365                 }
366             }
367             if (i > 63) {
368                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
369                 return -1;
370             }
371
372             mismatch ^= level;
373             block[j]  = level;
374             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
375                 break;
376             UPDATE_CACHE(re, &s->gb);
377         }
378 end:
379         LAST_SKIP_BITS(re, &s->gb, 2);
380         CLOSE_READER(re, &s->gb);
381     }
382     block[63] ^= (mismatch & 1);
383
384     s->block_last_index[n] = i;
385     return 0;
386 }
387
388 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
389                                                     DCTELEM *block, int n)
390 {
391     int level, i, j, run;
392     RLTable *rl = &ff_rl_mpeg1;
393     uint8_t * const scantable = s->intra_scantable.permutated;
394     const int qscale          = s->qscale;
395     OPEN_READER(re, &s->gb);
396     i = -1;
397
398     // special case for first coefficient, no need to add second VLC table
399     UPDATE_CACHE(re, &s->gb);
400     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
401         level = (3 * qscale) >> 1;
402         if (GET_CACHE(re, &s->gb) & 0x40000000)
403             level = -level;
404         block[0] = level;
405         i++;
406         SKIP_BITS(re, &s->gb, 2);
407         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
408             goto end;
409     }
410
411     /* now quantify & encode AC coefficients */
412     for (;;) {
413         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
414
415         if (level != 0) {
416             i += run;
417             j  = scantable[i];
418             level = ((level * 2 + 1) * qscale) >> 1;
419             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
420             SKIP_BITS(re, &s->gb, 1);
421         } else {
422             /* escape */
423             run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
424             UPDATE_CACHE(re, &s->gb);
425             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
426
427             i += run;
428             j  = scantable[i];
429             if (level < 0) {
430                 level = ((-level * 2 + 1) * qscale) >> 1;
431                 level = -level;
432             } else {
433                 level = ((level * 2 + 1) * qscale) >> 1;
434             }
435         }
436
437         block[j] = level;
438         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
439             break;
440         UPDATE_CACHE(re, &s->gb);
441     }
442 end:
443     LAST_SKIP_BITS(re, &s->gb, 2);
444     CLOSE_READER(re, &s->gb);
445     s->block_last_index[n] = i;
446     return 0;
447 }
448
449
450 static inline int mpeg2_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n)
451 {
452     int level, dc, diff, i, j, run;
453     int component;
454     RLTable *rl;
455     uint8_t * const scantable = s->intra_scantable.permutated;
456     const uint16_t *quant_matrix;
457     const int qscale = s->qscale;
458     int mismatch;
459
460     /* DC coefficient */
461     if (n < 4) {
462         quant_matrix = s->intra_matrix;
463         component = 0;
464     } else {
465         quant_matrix = s->chroma_intra_matrix;
466         component = (n & 1) + 1;
467     }
468     diff = decode_dc(&s->gb, component);
469     if (diff >= 0xffff)
470         return -1;
471     dc  = s->last_dc[component];
472     dc += diff;
473     s->last_dc[component] = dc;
474     block[0] = dc << (3 - s->intra_dc_precision);
475     av_dlog(s->avctx, "dc=%d\n", block[0]);
476     mismatch = block[0] ^ 1;
477     i = 0;
478     if (s->intra_vlc_format)
479         rl = &ff_rl_mpeg2;
480     else
481         rl = &ff_rl_mpeg1;
482
483     {
484         OPEN_READER(re, &s->gb);
485         /* now quantify & encode AC coefficients */
486         for (;;) {
487             UPDATE_CACHE(re, &s->gb);
488             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
489
490             if (level == 127) {
491                 break;
492             } else if (level != 0) {
493                 i += run;
494                 j  = scantable[i];
495                 level = (level * qscale * quant_matrix[j]) >> 4;
496                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
497                 LAST_SKIP_BITS(re, &s->gb, 1);
498             } else {
499                 /* escape */
500                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
501                 UPDATE_CACHE(re, &s->gb);
502                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
503                 i += run;
504                 j  = scantable[i];
505                 if (level < 0) {
506                     level = (-level * qscale * quant_matrix[j]) >> 4;
507                     level = -level;
508                 } else {
509                     level = (level * qscale * quant_matrix[j]) >> 4;
510                 }
511             }
512             if (i > 63) {
513                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
514                 return -1;
515             }
516
517             mismatch ^= level;
518             block[j]  = level;
519         }
520         CLOSE_READER(re, &s->gb);
521     }
522     block[63] ^= mismatch & 1;
523
524     s->block_last_index[n] = i;
525     return 0;
526 }
527
528 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n)
529 {
530     int level, dc, diff, j, run;
531     int component;
532     RLTable *rl;
533     uint8_t * scantable = s->intra_scantable.permutated;
534     const uint16_t *quant_matrix;
535     const int qscale = s->qscale;
536
537     /* DC coefficient */
538     if (n < 4) {
539         quant_matrix = s->intra_matrix;
540         component = 0;
541     } else {
542         quant_matrix = s->chroma_intra_matrix;
543         component = (n & 1) + 1;
544     }
545     diff = decode_dc(&s->gb, component);
546     if (diff >= 0xffff)
547         return -1;
548     dc = s->last_dc[component];
549     dc += diff;
550     s->last_dc[component] = dc;
551     block[0] = dc << (3 - s->intra_dc_precision);
552     if (s->intra_vlc_format)
553         rl = &ff_rl_mpeg2;
554     else
555         rl = &ff_rl_mpeg1;
556
557     {
558         OPEN_READER(re, &s->gb);
559         /* now quantify & encode AC coefficients */
560         for (;;) {
561             UPDATE_CACHE(re, &s->gb);
562             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
563
564             if (level == 127) {
565                 break;
566             } else if (level != 0) {
567                 scantable += run;
568                 j = *scantable;
569                 level = (level * qscale * quant_matrix[j]) >> 4;
570                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
571                 LAST_SKIP_BITS(re, &s->gb, 1);
572             } else {
573                 /* escape */
574                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
575                 UPDATE_CACHE(re, &s->gb);
576                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
577                 scantable += run;
578                 j = *scantable;
579                 if (level < 0) {
580                     level = (-level * qscale * quant_matrix[j]) >> 4;
581                     level = -level;
582                 } else {
583                     level = (level * qscale * quant_matrix[j]) >> 4;
584                 }
585             }
586
587             block[j] = level;
588         }
589         CLOSE_READER(re, &s->gb);
590     }
591
592     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
593     return 0;
594 }
595
596 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
597
598 #define INIT_2D_VLC_RL(rl, static_size)\
599 {\
600     static RL_VLC_ELEM rl_vlc_table[static_size];\
601     INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
602                     &rl.table_vlc[0][1], 4, 2,\
603                     &rl.table_vlc[0][0], 4, 2, static_size);\
604 \
605     rl.rl_vlc[0] = rl_vlc_table;\
606     init_2d_vlc_rl(&rl);\
607 }
608
609 static void init_2d_vlc_rl(RLTable *rl)
610 {
611     int i;
612
613     for (i = 0; i < rl->vlc.table_size; i++) {
614         int code = rl->vlc.table[i][0];
615         int len  = rl->vlc.table[i][1];
616         int level, run;
617
618         if (len == 0) { // illegal code
619             run   = 65;
620             level = MAX_LEVEL;
621         } else if (len<0) { //more bits needed
622             run   = 0;
623             level = code;
624         } else {
625             if (code == rl->n) { //esc
626                 run   = 65;
627                 level = 0;
628             } else if (code == rl->n+1) { //eob
629                 run   = 0;
630                 level = 127;
631             } else {
632                 run   = rl->table_run  [code] + 1;
633                 level = rl->table_level[code];
634             }
635         }
636         rl->rl_vlc[0][i].len   = len;
637         rl->rl_vlc[0][i].level = level;
638         rl->rl_vlc[0][i].run   = run;
639     }
640 }
641
642 void ff_mpeg12_common_init(MpegEncContext *s)
643 {
644
645     s->y_dc_scale_table =
646     s->c_dc_scale_table = ff_mpeg2_dc_scale_table[s->intra_dc_precision];
647
648 }
649
650 void ff_mpeg1_clean_buffers(MpegEncContext *s)
651 {
652     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
653     s->last_dc[1] = s->last_dc[0];
654     s->last_dc[2] = s->last_dc[0];
655     memset(s->last_mv, 0, sizeof(s->last_mv));
656 }
657
658
659 /******************************************/
660 /* decoding */
661
662 VLC ff_dc_lum_vlc;
663 VLC ff_dc_chroma_vlc;
664
665 static VLC mbincr_vlc;
666 static VLC mb_ptype_vlc;
667 static VLC mb_btype_vlc;
668 static VLC mb_pat_vlc;
669
670 av_cold void ff_mpeg12_init_vlcs(void)
671 {
672     static int done = 0;
673
674     if (!done) {
675         done = 1;
676
677         INIT_VLC_STATIC(&ff_dc_lum_vlc, DC_VLC_BITS, 12,
678                         ff_mpeg12_vlc_dc_lum_bits, 1, 1,
679                         ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
680         INIT_VLC_STATIC(&ff_dc_chroma_vlc,  DC_VLC_BITS, 12,
681                         ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
682                         ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
683         INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
684                         &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
685                         &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
686         INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
687                         &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
688                         &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
689         INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
690                         &ff_mpeg12_mbPatTable[0][1], 2, 1,
691                         &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
692
693         INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
694                         &table_mb_ptype[0][1], 2, 1,
695                         &table_mb_ptype[0][0], 2, 1, 64);
696         INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
697                         &table_mb_btype[0][1], 2, 1,
698                         &table_mb_btype[0][0], 2, 1, 64);
699         init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
700         init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
701
702         INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
703         INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
704     }
705 }
706
707 static inline int get_dmv(MpegEncContext *s)
708 {
709     if (get_bits1(&s->gb))
710         return 1 - (get_bits1(&s->gb) << 1);
711     else
712         return 0;
713 }
714
715 static inline int get_qscale(MpegEncContext *s)
716 {
717     int qscale = get_bits(&s->gb, 5);
718     if (s->q_scale_type) {
719         return non_linear_qscale[qscale];
720     } else {
721         return qscale << 1;
722     }
723 }
724
725 static void exchange_uv(MpegEncContext *s)
726 {
727     DCTELEM (*tmp)[64];
728
729     tmp           = s->pblocks[4];
730     s->pblocks[4] = s->pblocks[5];
731     s->pblocks[5] = tmp;
732 }
733
734 /* motion type (for MPEG-2) */
735 #define MT_FIELD 1
736 #define MT_FRAME 2
737 #define MT_16X8  2
738 #define MT_DMV   3
739
740 static int mpeg_decode_mb(MpegEncContext *s, DCTELEM block[12][64])
741 {
742     int i, j, k, cbp, val, mb_type, motion_type;
743     const int mb_block_count = 4 + (1 << s->chroma_format);
744
745     av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
746
747     assert(s->mb_skipped == 0);
748
749     if (s->mb_skip_run-- != 0) {
750         if (s->pict_type == AV_PICTURE_TYPE_P) {
751             s->mb_skipped = 1;
752             s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride] = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
753         } else {
754             int mb_type;
755
756             if (s->mb_x)
757                 mb_type = s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
758             else
759                 mb_type = s->current_picture.f.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1]; // FIXME not sure if this is allowed in MPEG at all
760             if (IS_INTRA(mb_type))
761                 return -1;
762             s->current_picture.f.mb_type[s->mb_x + s->mb_y*s->mb_stride] =
763                 mb_type | MB_TYPE_SKIP;
764 //            assert(s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1] & (MB_TYPE_16x16 | MB_TYPE_16x8));
765
766             if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
767                 s->mb_skipped = 1;
768         }
769
770         return 0;
771     }
772
773     switch (s->pict_type) {
774     default:
775     case AV_PICTURE_TYPE_I:
776         if (get_bits1(&s->gb) == 0) {
777             if (get_bits1(&s->gb) == 0) {
778                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
779                 return -1;
780             }
781             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
782         } else {
783             mb_type = MB_TYPE_INTRA;
784         }
785         break;
786     case AV_PICTURE_TYPE_P:
787         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
788         if (mb_type < 0) {
789             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
790             return -1;
791         }
792         mb_type = ptype2mb_type[mb_type];
793         break;
794     case AV_PICTURE_TYPE_B:
795         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
796         if (mb_type < 0) {
797             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
798             return -1;
799         }
800         mb_type = btype2mb_type[mb_type];
801         break;
802     }
803     av_dlog(s->avctx, "mb_type=%x\n", mb_type);
804 //    motion_type = 0; /* avoid warning */
805     if (IS_INTRA(mb_type)) {
806         s->dsp.clear_blocks(s->block[0]);
807
808         if (!s->chroma_y_shift) {
809             s->dsp.clear_blocks(s->block[6]);
810         }
811
812         /* compute DCT type */
813         if (s->picture_structure == PICT_FRAME && // FIXME add an interlaced_dct coded var?
814             !s->frame_pred_frame_dct) {
815             s->interlaced_dct = get_bits1(&s->gb);
816         }
817
818         if (IS_QUANT(mb_type))
819             s->qscale = get_qscale(s);
820
821         if (s->concealment_motion_vectors) {
822             /* just parse them */
823             if (s->picture_structure != PICT_FRAME)
824                 skip_bits1(&s->gb); /* field select */
825
826             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
827                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
828             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
829                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
830
831             skip_bits1(&s->gb); /* marker */
832         } else
833             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
834         s->mb_intra = 1;
835         // if 1, we memcpy blocks in xvmcvideo
836         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
837             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
838             if (s->swap_uv) {
839                 exchange_uv(s);
840             }
841         }
842
843         if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
844             if (s->flags2 & CODEC_FLAG2_FAST) {
845                 for (i = 0; i < 6; i++) {
846                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
847                 }
848             } else {
849                 for (i = 0; i < mb_block_count; i++) {
850                     if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
851                         return -1;
852                 }
853             }
854         } else {
855             for (i = 0; i < 6; i++) {
856                 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
857                     return -1;
858             }
859         }
860     } else {
861         if (mb_type & MB_TYPE_ZERO_MV) {
862             assert(mb_type & MB_TYPE_CBP);
863
864             s->mv_dir = MV_DIR_FORWARD;
865             if (s->picture_structure == PICT_FRAME) {
866                 if (!s->frame_pred_frame_dct)
867                     s->interlaced_dct = get_bits1(&s->gb);
868                 s->mv_type = MV_TYPE_16X16;
869             } else {
870                 s->mv_type = MV_TYPE_FIELD;
871                 mb_type |= MB_TYPE_INTERLACED;
872                 s->field_select[0][0] = s->picture_structure - 1;
873             }
874
875             if (IS_QUANT(mb_type))
876                 s->qscale = get_qscale(s);
877
878             s->last_mv[0][0][0] = 0;
879             s->last_mv[0][0][1] = 0;
880             s->last_mv[0][1][0] = 0;
881             s->last_mv[0][1][1] = 0;
882             s->mv[0][0][0] = 0;
883             s->mv[0][0][1] = 0;
884         } else {
885             assert(mb_type & MB_TYPE_L0L1);
886             // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
887             /* get additional motion vector type */
888             if (s->frame_pred_frame_dct)
889                 motion_type = MT_FRAME;
890             else {
891                 motion_type = get_bits(&s->gb, 2);
892                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
893                     s->interlaced_dct = get_bits1(&s->gb);
894             }
895
896             if (IS_QUANT(mb_type))
897                 s->qscale = get_qscale(s);
898
899             /* motion vectors */
900             s->mv_dir = (mb_type >> 13) & 3;
901             av_dlog(s->avctx, "motion_type=%d\n", motion_type);
902             switch (motion_type) {
903             case MT_FRAME: /* or MT_16X8 */
904                 if (s->picture_structure == PICT_FRAME) {
905                     mb_type |= MB_TYPE_16x16;
906                     s->mv_type = MV_TYPE_16X16;
907                     for (i = 0; i < 2; i++) {
908                         if (USES_LIST(mb_type, i)) {
909                             /* MT_FRAME */
910                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
911                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
912                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
913                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
914                             /* full_pel: only for MPEG-1 */
915                             if (s->full_pel[i]) {
916                                 s->mv[i][0][0] <<= 1;
917                                 s->mv[i][0][1] <<= 1;
918                             }
919                         }
920                     }
921                 } else {
922                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
923                     s->mv_type = MV_TYPE_16X8;
924                     for (i = 0; i < 2; i++) {
925                         if (USES_LIST(mb_type, i)) {
926                             /* MT_16X8 */
927                             for (j = 0; j < 2; j++) {
928                                 s->field_select[i][j] = get_bits1(&s->gb);
929                                 for (k = 0; k < 2; k++) {
930                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
931                                                              s->last_mv[i][j][k]);
932                                     s->last_mv[i][j][k] = val;
933                                     s->mv[i][j][k]      = val;
934                                 }
935                             }
936                         }
937                     }
938                 }
939                 break;
940             case MT_FIELD:
941                 s->mv_type = MV_TYPE_FIELD;
942                 if (s->picture_structure == PICT_FRAME) {
943                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
944                     for (i = 0; i < 2; i++) {
945                         if (USES_LIST(mb_type, i)) {
946                             for (j = 0; j < 2; j++) {
947                                 s->field_select[i][j] = get_bits1(&s->gb);
948                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
949                                                          s->last_mv[i][j][0]);
950                                 s->last_mv[i][j][0] = val;
951                                 s->mv[i][j][0]      = val;
952                                 av_dlog(s->avctx, "fmx=%d\n", val);
953                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
954                                                          s->last_mv[i][j][1] >> 1);
955                                 s->last_mv[i][j][1] = val << 1;
956                                 s->mv[i][j][1]      = val;
957                                 av_dlog(s->avctx, "fmy=%d\n", val);
958                             }
959                         }
960                     }
961                 } else {
962                     av_assert0(!s->progressive_sequence);
963                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
964                     for (i = 0; i < 2; i++) {
965                         if (USES_LIST(mb_type, i)) {
966                             s->field_select[i][0] = get_bits1(&s->gb);
967                             for (k = 0; k < 2; k++) {
968                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
969                                                          s->last_mv[i][0][k]);
970                                 s->last_mv[i][0][k] = val;
971                                 s->last_mv[i][1][k] = val;
972                                 s->mv[i][0][k]      = val;
973                             }
974                         }
975                     }
976                 }
977                 break;
978             case MT_DMV:
979                 if(s->progressive_sequence){
980                     av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
981                     return -1;
982                 }
983                 s->mv_type = MV_TYPE_DMV;
984                 for (i = 0; i < 2; i++) {
985                     if (USES_LIST(mb_type, i)) {
986                         int dmx, dmy, mx, my, m;
987                         const int my_shift = s->picture_structure == PICT_FRAME;
988
989                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
990                                                 s->last_mv[i][0][0]);
991                         s->last_mv[i][0][0] = mx;
992                         s->last_mv[i][1][0] = mx;
993                         dmx = get_dmv(s);
994                         my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
995                                                  s->last_mv[i][0][1] >> my_shift);
996                         dmy = get_dmv(s);
997
998
999                         s->last_mv[i][0][1] = my << my_shift;
1000                         s->last_mv[i][1][1] = my << my_shift;
1001
1002                         s->mv[i][0][0] = mx;
1003                         s->mv[i][0][1] = my;
1004                         s->mv[i][1][0] = mx; // not used
1005                         s->mv[i][1][1] = my; // not used
1006
1007                         if (s->picture_structure == PICT_FRAME) {
1008                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1009
1010                             // m = 1 + 2 * s->top_field_first;
1011                             m = s->top_field_first ? 1 : 3;
1012
1013                             /* top -> top pred */
1014                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1015                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1016                             m = 4 - m;
1017                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1018                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1019                         } else {
1020                             mb_type |= MB_TYPE_16x16;
1021
1022                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1023                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1024                             if (s->picture_structure == PICT_TOP_FIELD)
1025                                 s->mv[i][2][1]--;
1026                             else
1027                                 s->mv[i][2][1]++;
1028                         }
1029                     }
1030                 }
1031                 break;
1032             default:
1033                 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1034                 return -1;
1035             }
1036         }
1037
1038         s->mb_intra = 0;
1039         if (HAS_CBP(mb_type)) {
1040             s->dsp.clear_blocks(s->block[0]);
1041
1042             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1043             if (mb_block_count > 6) {
1044                  cbp <<= mb_block_count - 6;
1045                  cbp  |= get_bits(&s->gb, mb_block_count - 6);
1046                  s->dsp.clear_blocks(s->block[6]);
1047             }
1048             if (cbp <= 0) {
1049                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1050                 return -1;
1051             }
1052
1053             //if 1, we memcpy blocks in xvmcvideo
1054             if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
1055                 ff_xvmc_pack_pblocks(s, cbp);
1056                 if (s->swap_uv) {
1057                     exchange_uv(s);
1058                 }
1059             }
1060
1061             if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1062                 if (s->flags2 & CODEC_FLAG2_FAST) {
1063                     for (i = 0; i < 6; i++) {
1064                         if (cbp & 32) {
1065                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1066                         } else {
1067                             s->block_last_index[i] = -1;
1068                         }
1069                         cbp += cbp;
1070                     }
1071                 } else {
1072                     cbp <<= 12-mb_block_count;
1073
1074                     for (i = 0; i < mb_block_count; i++) {
1075                         if (cbp & (1 << 11)) {
1076                             if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
1077                                 return -1;
1078                         } else {
1079                             s->block_last_index[i] = -1;
1080                         }
1081                         cbp += cbp;
1082                     }
1083                 }
1084             } else {
1085                 if (s->flags2 & CODEC_FLAG2_FAST) {
1086                     for (i = 0; i < 6; i++) {
1087                         if (cbp & 32) {
1088                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1089                         } else {
1090                             s->block_last_index[i] = -1;
1091                         }
1092                         cbp += cbp;
1093                     }
1094                 } else {
1095                     for (i = 0; i < 6; i++) {
1096                         if (cbp & 32) {
1097                             if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
1098                                 return -1;
1099                         } else {
1100                             s->block_last_index[i] = -1;
1101                         }
1102                         cbp += cbp;
1103                     }
1104                 }
1105             }
1106         } else {
1107             for (i = 0; i < 12; i++)
1108                 s->block_last_index[i] = -1;
1109         }
1110     }
1111
1112     s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1113
1114     return 0;
1115 }
1116
1117 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1118 {
1119     Mpeg1Context *s = avctx->priv_data;
1120     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1121     int i;
1122
1123     /* we need some permutation to store matrices,
1124      * until MPV_common_init() sets the real permutation. */
1125     for (i = 0; i < 64; i++)
1126        s2->dsp.idct_permutation[i]=i;
1127
1128     MPV_decode_defaults(s2);
1129
1130     s->mpeg_enc_ctx.avctx  = avctx;
1131     s->mpeg_enc_ctx.flags  = avctx->flags;
1132     s->mpeg_enc_ctx.flags2 = avctx->flags2;
1133     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1134     ff_mpeg12_init_vlcs();
1135
1136     s->mpeg_enc_ctx_allocated      = 0;
1137     s->mpeg_enc_ctx.picture_number = 0;
1138     s->repeat_field                = 0;
1139     s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1140     avctx->color_range = AVCOL_RANGE_MPEG;
1141     if (avctx->codec->id == CODEC_ID_MPEG1VIDEO)
1142         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1143     else
1144         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1145     return 0;
1146 }
1147
1148 static int mpeg_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
1149 {
1150     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1151     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1152     int err;
1153
1154     if (avctx == avctx_from || !ctx_from->mpeg_enc_ctx_allocated || !s1->context_initialized)
1155         return 0;
1156
1157     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1158     if (err) return err;
1159
1160     if (!ctx->mpeg_enc_ctx_allocated)
1161         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1162
1163     if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1164         s->picture_number++;
1165
1166     return 0;
1167 }
1168
1169 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1170                                  const uint8_t *new_perm)
1171 {
1172     uint16_t temp_matrix[64];
1173     int i;
1174
1175     memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1176
1177     for (i = 0; i < 64; i++) {
1178         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1179     }
1180 }
1181
1182 static const enum PixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1183 #if CONFIG_MPEG_XVMC_DECODER
1184     PIX_FMT_XVMC_MPEG2_IDCT,
1185     PIX_FMT_XVMC_MPEG2_MC,
1186 #endif
1187 #if CONFIG_MPEG1_VDPAU_HWACCEL
1188     PIX_FMT_VDPAU_MPEG1,
1189 #endif
1190     PIX_FMT_YUV420P,
1191     PIX_FMT_NONE
1192 };
1193
1194 static const enum PixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1195 #if CONFIG_MPEG_XVMC_DECODER
1196     PIX_FMT_XVMC_MPEG2_IDCT,
1197     PIX_FMT_XVMC_MPEG2_MC,
1198 #endif
1199 #if CONFIG_MPEG2_VDPAU_HWACCEL
1200     PIX_FMT_VDPAU_MPEG2,
1201 #endif
1202 #if CONFIG_MPEG2_DXVA2_HWACCEL
1203     PIX_FMT_DXVA2_VLD,
1204 #endif
1205 #if CONFIG_MPEG2_VAAPI_HWACCEL
1206     PIX_FMT_VAAPI_VLD,
1207 #endif
1208     PIX_FMT_YUV420P,
1209     PIX_FMT_NONE
1210 };
1211
1212 static inline int uses_vdpau(AVCodecContext *avctx) {
1213     return avctx->pix_fmt == PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == PIX_FMT_VDPAU_MPEG2;
1214 }
1215
1216 static enum PixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1217 {
1218     Mpeg1Context *s1 = avctx->priv_data;
1219     MpegEncContext *s = &s1->mpeg_enc_ctx;
1220
1221     if(s->chroma_format < 2) {
1222         enum PixelFormat res;
1223         res = avctx->get_format(avctx,
1224                                 avctx->codec_id == CODEC_ID_MPEG1VIDEO ?
1225                                 mpeg1_hwaccel_pixfmt_list_420 :
1226                                 mpeg2_hwaccel_pixfmt_list_420);
1227         if (res != PIX_FMT_XVMC_MPEG2_IDCT && res != PIX_FMT_XVMC_MPEG2_MC) {
1228             avctx->xvmc_acceleration = 0;
1229         } else if (!avctx->xvmc_acceleration) {
1230             avctx->xvmc_acceleration = 2;
1231         }
1232         return res;
1233     } else if(s->chroma_format == 2)
1234         return PIX_FMT_YUV422P;
1235     else
1236         return PIX_FMT_YUV444P;
1237 }
1238
1239 /* Call this function when we know all parameters.
1240  * It may be called in different places for MPEG-1 and MPEG-2. */
1241 static int mpeg_decode_postinit(AVCodecContext *avctx)
1242 {
1243     Mpeg1Context *s1 = avctx->priv_data;
1244     MpegEncContext *s = &s1->mpeg_enc_ctx;
1245     uint8_t old_permutation[64];
1246
1247     if ((s1->mpeg_enc_ctx_allocated == 0) ||
1248         avctx->coded_width  != s->width   ||
1249         avctx->coded_height != s->height  ||
1250         s1->save_width           != s->width                ||
1251         s1->save_height          != s->height               ||
1252         s1->save_aspect_info     != s->aspect_ratio_info    ||
1253         s1->save_progressive_seq != s->progressive_sequence ||
1254         0)
1255     {
1256
1257         if (s1->mpeg_enc_ctx_allocated) {
1258             ParseContext pc = s->parse_context;
1259             s->parse_context.buffer = 0;
1260             MPV_common_end(s);
1261             s->parse_context = pc;
1262         }
1263
1264         if ((s->width == 0) || (s->height == 0))
1265             return -2;
1266
1267         avcodec_set_dimensions(avctx, s->width, s->height);
1268         avctx->bit_rate          = s->bit_rate;
1269         s1->save_aspect_info     = s->aspect_ratio_info;
1270         s1->save_width           = s->width;
1271         s1->save_height          = s->height;
1272         s1->save_progressive_seq = s->progressive_sequence;
1273
1274         /* low_delay may be forced, in this case we will have B-frames
1275          * that behave like P-frames. */
1276         avctx->has_b_frames = !s->low_delay;
1277
1278         assert((avctx->sub_id == 1) == (avctx->codec_id == CODEC_ID_MPEG1VIDEO));
1279         if (avctx->codec_id == CODEC_ID_MPEG1VIDEO) {
1280             //MPEG-1 fps
1281             avctx->time_base.den = avpriv_frame_rate_tab[s->frame_rate_index].num;
1282             avctx->time_base.num = avpriv_frame_rate_tab[s->frame_rate_index].den;
1283             //MPEG-1 aspect
1284             avctx->sample_aspect_ratio = av_d2q(1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1285             avctx->ticks_per_frame=1;
1286         } else {//MPEG-2
1287         //MPEG-2 fps
1288             av_reduce(&s->avctx->time_base.den,
1289                       &s->avctx->time_base.num,
1290                       avpriv_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1291                       avpriv_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1292                       1 << 30);
1293             avctx->ticks_per_frame = 2;
1294             //MPEG-2 aspect
1295             if (s->aspect_ratio_info > 1) {
1296                 AVRational dar =
1297                     av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1298                                       (AVRational) {s1->pan_scan.width, s1->pan_scan.height}),
1299                              (AVRational) {s->width, s->height});
1300
1301                 // we ignore the spec here and guess a bit as reality does not match the spec, see for example
1302                 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1303                 // issue1613, 621, 562
1304                 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1305                    (av_cmp_q(dar, (AVRational) {4, 3}) && av_cmp_q(dar, (AVRational) {16, 9}))) {
1306                     s->avctx->sample_aspect_ratio =
1307                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1308                                  (AVRational) {s->width, s->height});
1309                 } else {
1310                     s->avctx->sample_aspect_ratio =
1311                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1312                                  (AVRational) {s1->pan_scan.width, s1->pan_scan.height});
1313 //issue1613 4/3 16/9 -> 16/9
1314 //res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1315 //widescreen-issue562.mpg 4/3 16/9 -> 16/9
1316 //                    s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1317 //av_log(NULL, AV_LOG_ERROR, "A %d/%d\n", ff_mpeg2_aspect[s->aspect_ratio_info].num, ff_mpeg2_aspect[s->aspect_ratio_info].den);
1318 //av_log(NULL, AV_LOG_ERROR, "B %d/%d\n", s->avctx->sample_aspect_ratio.num, s->avctx->sample_aspect_ratio.den);
1319                 }
1320             } else {
1321                 s->avctx->sample_aspect_ratio =
1322                     ff_mpeg2_aspect[s->aspect_ratio_info];
1323             }
1324         } // MPEG-2
1325
1326         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1327         avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1328         // until then pix_fmt may be changed right after codec init
1329         if (avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
1330             avctx->hwaccel )
1331             if (avctx->idct_algo == FF_IDCT_AUTO)
1332                 avctx->idct_algo = FF_IDCT_SIMPLE;
1333
1334         /* Quantization matrices may need reordering
1335          * if DCT permutation is changed. */
1336         memcpy(old_permutation, s->dsp.idct_permutation, 64 * sizeof(uint8_t));
1337
1338         if (MPV_common_init(s) < 0)
1339             return -2;
1340
1341         quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->dsp.idct_permutation);
1342         quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->dsp.idct_permutation);
1343         quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->dsp.idct_permutation);
1344         quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->dsp.idct_permutation);
1345
1346         s1->mpeg_enc_ctx_allocated = 1;
1347     }
1348     return 0;
1349 }
1350
1351 static int mpeg1_decode_picture(AVCodecContext *avctx,
1352                                 const uint8_t *buf, int buf_size)
1353 {
1354     Mpeg1Context *s1 = avctx->priv_data;
1355     MpegEncContext *s = &s1->mpeg_enc_ctx;
1356     int ref, f_code, vbv_delay;
1357
1358     init_get_bits(&s->gb, buf, buf_size*8);
1359
1360     ref = get_bits(&s->gb, 10); /* temporal ref */
1361     s->pict_type = get_bits(&s->gb, 3);
1362     if (s->pict_type == 0 || s->pict_type > 3)
1363         return -1;
1364
1365     vbv_delay = get_bits(&s->gb, 16);
1366     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
1367         s->full_pel[0] = get_bits1(&s->gb);
1368         f_code = get_bits(&s->gb, 3);
1369         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1370             return -1;
1371         s->mpeg_f_code[0][0] = f_code;
1372         s->mpeg_f_code[0][1] = f_code;
1373     }
1374     if (s->pict_type == AV_PICTURE_TYPE_B) {
1375         s->full_pel[1] = get_bits1(&s->gb);
1376         f_code = get_bits(&s->gb, 3);
1377         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1378             return -1;
1379         s->mpeg_f_code[1][0] = f_code;
1380         s->mpeg_f_code[1][1] = f_code;
1381     }
1382     s->current_picture.f.pict_type = s->pict_type;
1383     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1384
1385     if (avctx->debug & FF_DEBUG_PICT_INFO)
1386         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1387
1388     s->y_dc_scale = 8;
1389     s->c_dc_scale = 8;
1390     return 0;
1391 }
1392
1393 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1394 {
1395     MpegEncContext *s= &s1->mpeg_enc_ctx;
1396     int horiz_size_ext, vert_size_ext;
1397     int bit_rate_ext;
1398
1399     skip_bits(&s->gb, 1); /* profile and level esc*/
1400     s->avctx->profile       = get_bits(&s->gb, 3);
1401     s->avctx->level         = get_bits(&s->gb, 4);
1402     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1403     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1404     horiz_size_ext          = get_bits(&s->gb, 2);
1405     vert_size_ext           = get_bits(&s->gb, 2);
1406     s->width  |= (horiz_size_ext << 12);
1407     s->height |= (vert_size_ext  << 12);
1408     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1409     s->bit_rate += (bit_rate_ext << 18) * 400;
1410     skip_bits1(&s->gb); /* marker */
1411     s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1412
1413     s->low_delay = get_bits1(&s->gb);
1414     if (s->flags & CODEC_FLAG_LOW_DELAY)
1415         s->low_delay = 1;
1416
1417     s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1418     s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1419
1420     av_dlog(s->avctx, "sequence extension\n");
1421     s->codec_id      = s->avctx->codec_id = CODEC_ID_MPEG2VIDEO;
1422     s->avctx->sub_id = 2; /* indicates MPEG-2 found */
1423
1424     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1425         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1426                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1427
1428 }
1429
1430 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1431 {
1432     MpegEncContext *s = &s1->mpeg_enc_ctx;
1433     int color_description, w, h;
1434
1435     skip_bits(&s->gb, 3); /* video format */
1436     color_description = get_bits1(&s->gb);
1437     if (color_description) {
1438         s->avctx->color_primaries = get_bits(&s->gb, 8);
1439         s->avctx->color_trc       = get_bits(&s->gb, 8);
1440         s->avctx->colorspace      = get_bits(&s->gb, 8);
1441     }
1442     w = get_bits(&s->gb, 14);
1443     skip_bits(&s->gb, 1); //marker
1444     h = get_bits(&s->gb, 14);
1445     // remaining 3 bits are zero padding
1446
1447     s1->pan_scan.width  = 16 * w;
1448     s1->pan_scan.height = 16 * h;
1449
1450     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1451         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1452 }
1453
1454 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1455 {
1456     MpegEncContext *s = &s1->mpeg_enc_ctx;
1457     int i, nofco;
1458
1459     nofco = 1;
1460     if (s->progressive_sequence) {
1461         if (s->repeat_first_field) {
1462             nofco++;
1463             if (s->top_field_first)
1464                 nofco++;
1465         }
1466     } else {
1467         if (s->picture_structure == PICT_FRAME) {
1468             nofco++;
1469             if (s->repeat_first_field)
1470                 nofco++;
1471         }
1472     }
1473     for (i = 0; i < nofco; i++) {
1474         s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1475         skip_bits(&s->gb, 1); // marker
1476         s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1477         skip_bits(&s->gb, 1); // marker
1478     }
1479
1480     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1481         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1482                s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1483                s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1484                s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1485 }
1486
1487 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra)
1488 {
1489     int i;
1490
1491     for (i = 0; i < 64; i++) {
1492         int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1493         int v = get_bits(&s->gb, 8);
1494         if (v == 0) {
1495             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1496             return -1;
1497         }
1498         if (intra && i == 0 && v != 8) {
1499             av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
1500             v = 8; // needed by pink.mpg / issue1046
1501         }
1502         matrix0[j] = v;
1503         if (matrix1)
1504             matrix1[j] = v;
1505     }
1506     return 0;
1507 }
1508
1509 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1510 {
1511     av_dlog(s->avctx, "matrix extension\n");
1512
1513     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1514     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1515     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL           , 1);
1516     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL           , 0);
1517 }
1518
1519 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1520 {
1521     MpegEncContext *s = &s1->mpeg_enc_ctx;
1522
1523     s->full_pel[0] = s->full_pel[1] = 0;
1524     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1525     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1526     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1527     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1528     if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1529         av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1530         if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1531             if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1532                 s->pict_type = AV_PICTURE_TYPE_I;
1533             else
1534                 s->pict_type = AV_PICTURE_TYPE_P;
1535         } else
1536             s->pict_type = AV_PICTURE_TYPE_B;
1537         s->current_picture.f.pict_type = s->pict_type;
1538         s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1539     }
1540     s->intra_dc_precision         = get_bits(&s->gb, 2);
1541     s->picture_structure          = get_bits(&s->gb, 2);
1542     s->top_field_first            = get_bits1(&s->gb);
1543     s->frame_pred_frame_dct       = get_bits1(&s->gb);
1544     s->concealment_motion_vectors = get_bits1(&s->gb);
1545     s->q_scale_type               = get_bits1(&s->gb);
1546     s->intra_vlc_format           = get_bits1(&s->gb);
1547     s->alternate_scan             = get_bits1(&s->gb);
1548     s->repeat_first_field         = get_bits1(&s->gb);
1549     s->chroma_420_type            = get_bits1(&s->gb);
1550     s->progressive_frame          = get_bits1(&s->gb);
1551
1552     if (s->progressive_sequence && !s->progressive_frame) {
1553         s->progressive_frame = 1;
1554         av_log(s->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
1555     }
1556
1557     if (s->picture_structure == 0 || (s->progressive_frame && s->picture_structure != PICT_FRAME)) {
1558         av_log(s->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s->picture_structure);
1559         s->picture_structure = PICT_FRAME;
1560     }
1561
1562     if (s->progressive_sequence && !s->frame_pred_frame_dct) {
1563         av_log(s->avctx, AV_LOG_ERROR, "invalid frame_pred_frame_dct\n");
1564     }
1565
1566     if (s->picture_structure == PICT_FRAME) {
1567         s->first_field = 0;
1568         s->v_edge_pos  = 16 * s->mb_height;
1569     } else {
1570         s->first_field ^= 1;
1571         s->v_edge_pos   = 8 * s->mb_height;
1572         memset(s->mbskip_table, 0, s->mb_stride * s->mb_height);
1573     }
1574
1575     if (s->alternate_scan) {
1576         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1577         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1578     } else {
1579         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1580         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1581     }
1582
1583     /* composite display not parsed */
1584     av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1585     av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1586     av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1587     av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1588     av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1589     av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1590     av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1591     av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1592     av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1593 }
1594
1595 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1596 {
1597     AVCodecContext *avctx = s->avctx;
1598     Mpeg1Context *s1 = (Mpeg1Context*)s;
1599
1600     /* start frame decoding */
1601     if (s->first_field || s->picture_structure == PICT_FRAME) {
1602         if (MPV_frame_start(s, avctx) < 0)
1603             return -1;
1604
1605         ff_er_frame_start(s);
1606
1607         /* first check if we must repeat the frame */
1608         s->current_picture_ptr->f.repeat_pict = 0;
1609         if (s->repeat_first_field) {
1610             if (s->progressive_sequence) {
1611                 if (s->top_field_first)
1612                     s->current_picture_ptr->f.repeat_pict = 4;
1613                 else
1614                     s->current_picture_ptr->f.repeat_pict = 2;
1615             } else if (s->progressive_frame) {
1616                 s->current_picture_ptr->f.repeat_pict = 1;
1617             }
1618         }
1619
1620         *s->current_picture_ptr->f.pan_scan = s1->pan_scan;
1621
1622         if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1623             ff_thread_finish_setup(avctx);
1624     } else { // second field
1625         int i;
1626
1627         if (!s->current_picture_ptr) {
1628             av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1629             return -1;
1630         }
1631
1632         for (i = 0; i < 4; i++) {
1633             s->current_picture.f.data[i] = s->current_picture_ptr->f.data[i];
1634             if (s->picture_structure == PICT_BOTTOM_FIELD) {
1635                 s->current_picture.f.data[i] += s->current_picture_ptr->f.linesize[i];
1636             }
1637         }
1638     }
1639
1640     if (avctx->hwaccel) {
1641         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1642             return -1;
1643     }
1644
1645 // MPV_frame_start will call this function too,
1646 // but we need to call it on every field
1647     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1648         if (ff_xvmc_field_start(s, avctx) < 0)
1649             return -1;
1650
1651     return 0;
1652 }
1653
1654 #define DECODE_SLICE_ERROR -1
1655 #define DECODE_SLICE_OK     0
1656
1657 /**
1658  * Decode a slice.
1659  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1660  * @return DECODE_SLICE_ERROR if the slice is damaged,
1661  *         DECODE_SLICE_OK if this slice is OK
1662  */
1663 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1664                              const uint8_t **buf, int buf_size)
1665 {
1666     AVCodecContext *avctx = s->avctx;
1667     const int lowres      = s->avctx->lowres;
1668     const int field_pic   = s->picture_structure != PICT_FRAME;
1669
1670     s->resync_mb_x =
1671     s->resync_mb_y = -1;
1672
1673     assert(mb_y < s->mb_height);
1674
1675     init_get_bits(&s->gb, *buf, buf_size * 8);
1676
1677     ff_mpeg1_clean_buffers(s);
1678     s->interlaced_dct = 0;
1679
1680     s->qscale = get_qscale(s);
1681
1682     if (s->qscale == 0) {
1683         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1684         return -1;
1685     }
1686
1687     /* extra slice info */
1688     while (get_bits1(&s->gb) != 0) {
1689         skip_bits(&s->gb, 8);
1690     }
1691
1692     s->mb_x = 0;
1693
1694     if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1695         skip_bits1(&s->gb);
1696     } else {
1697         while (get_bits_left(&s->gb) > 0) {
1698             int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1699             if (code < 0) {
1700                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1701                 return -1;
1702             }
1703             if (code >= 33) {
1704                 if (code == 33) {
1705                     s->mb_x += 33;
1706                 }
1707                 /* otherwise, stuffing, nothing to do */
1708             } else {
1709                 s->mb_x += code;
1710                 break;
1711             }
1712         }
1713     }
1714
1715     if (s->mb_x >= (unsigned)s->mb_width) {
1716         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1717         return -1;
1718     }
1719
1720     if (avctx->hwaccel) {
1721         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1722         int start_code = -1;
1723         buf_end = avpriv_mpv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1724         if (buf_end < *buf + buf_size)
1725             buf_end -= 4;
1726         s->mb_y = mb_y;
1727         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1728             return DECODE_SLICE_ERROR;
1729         *buf = buf_end;
1730         return DECODE_SLICE_OK;
1731     }
1732
1733     s->resync_mb_x = s->mb_x;
1734     s->resync_mb_y = s->mb_y = mb_y;
1735     s->mb_skip_run = 0;
1736     ff_init_block_index(s);
1737
1738     if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1739         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1740              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",
1741                     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],
1742                     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")),
1743                     s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1744                     s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1745                     s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1746         }
1747     }
1748
1749     for (;;) {
1750         // If 1, we memcpy blocks in xvmcvideo.
1751         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1752             ff_xvmc_init_block(s); // set s->block
1753
1754         if (mpeg_decode_mb(s, s->block) < 0)
1755             return -1;
1756
1757         if (s->current_picture.f.motion_val[0] && !s->encoding) { // note motion_val is normally NULL unless we want to extract the MVs
1758             const int wrap = s->b8_stride;
1759             int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1760             int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1761             int motion_x, motion_y, dir, i;
1762
1763             for (i = 0; i < 2; i++) {
1764                 for (dir = 0; dir < 2; dir++) {
1765                     if (s->mb_intra || (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1766                         motion_x = motion_y = 0;
1767                     } else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1768                         motion_x = s->mv[dir][0][0];
1769                         motion_y = s->mv[dir][0][1];
1770                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1771                         motion_x = s->mv[dir][i][0];
1772                         motion_y = s->mv[dir][i][1];
1773                     }
1774
1775                     s->current_picture.f.motion_val[dir][xy    ][0] = motion_x;
1776                     s->current_picture.f.motion_val[dir][xy    ][1] = motion_y;
1777                     s->current_picture.f.motion_val[dir][xy + 1][0] = motion_x;
1778                     s->current_picture.f.motion_val[dir][xy + 1][1] = motion_y;
1779                     s->current_picture.f.ref_index [dir][b8_xy    ] =
1780                     s->current_picture.f.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1781                     assert(s->field_select[dir][i] == 0 || s->field_select[dir][i] == 1);
1782                 }
1783                 xy += wrap;
1784                 b8_xy +=2;
1785             }
1786         }
1787
1788         s->dest[0] += 16 >> lowres;
1789         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1790         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1791
1792         MPV_decode_mb(s, s->block);
1793
1794         if (++s->mb_x >= s->mb_width) {
1795             const int mb_size = 16 >> s->avctx->lowres;
1796
1797             ff_draw_horiz_band(s, mb_size*(s->mb_y >> field_pic), mb_size);
1798             MPV_report_decode_progress(s);
1799
1800             s->mb_x = 0;
1801             s->mb_y += 1 << field_pic;
1802
1803             if (s->mb_y >= s->mb_height) {
1804                 int left   = get_bits_left(&s->gb);
1805                 int is_d10 = s->chroma_format == 2 && s->pict_type == AV_PICTURE_TYPE_I && avctx->profile == 0 && avctx->level == 5
1806                              && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1807                              && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1808
1809                 if (left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1810                     || ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1811                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1812                     return -1;
1813                 } else
1814                     goto eos;
1815             }
1816
1817             ff_init_block_index(s);
1818         }
1819
1820         /* skip mb handling */
1821         if (s->mb_skip_run == -1) {
1822             /* read increment again */
1823             s->mb_skip_run = 0;
1824             for (;;) {
1825                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1826                 if (code < 0) {
1827                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1828                     return -1;
1829                 }
1830                 if (code >= 33) {
1831                     if (code == 33) {
1832                         s->mb_skip_run += 33;
1833                     } else if (code == 35) {
1834                         if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1835                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1836                             return -1;
1837                         }
1838                         goto eos; /* end of slice */
1839                     }
1840                     /* otherwise, stuffing, nothing to do */
1841                 } else {
1842                     s->mb_skip_run += code;
1843                     break;
1844                 }
1845             }
1846             if (s->mb_skip_run) {
1847                 int i;
1848                 if (s->pict_type == AV_PICTURE_TYPE_I) {
1849                     av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1850                     return -1;
1851                 }
1852
1853                 /* skip mb */
1854                 s->mb_intra = 0;
1855                 for (i = 0; i < 12; i++)
1856                     s->block_last_index[i] = -1;
1857                 if (s->picture_structure == PICT_FRAME)
1858                     s->mv_type = MV_TYPE_16X16;
1859                 else
1860                     s->mv_type = MV_TYPE_FIELD;
1861                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1862                     /* if P type, zero motion vector is implied */
1863                     s->mv_dir             = MV_DIR_FORWARD;
1864                     s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1865                     s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1866                     s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1867                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1868                 } else {
1869                     /* if B type, reuse previous vectors and directions */
1870                     s->mv[0][0][0] = s->last_mv[0][0][0];
1871                     s->mv[0][0][1] = s->last_mv[0][0][1];
1872                     s->mv[1][0][0] = s->last_mv[1][0][0];
1873                     s->mv[1][0][1] = s->last_mv[1][0][1];
1874                 }
1875             }
1876         }
1877     }
1878 eos: // end of slice
1879     *buf += (get_bits_count(&s->gb)-1)/8;
1880 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1881     return 0;
1882 }
1883
1884 static int slice_decode_thread(AVCodecContext *c, void *arg)
1885 {
1886     MpegEncContext *s   = *(void**)arg;
1887     const uint8_t *buf  = s->gb.buffer;
1888     int mb_y            = s->start_mb_y;
1889     const int field_pic = s->picture_structure != PICT_FRAME;
1890
1891     s->error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1892
1893     for (;;) {
1894         uint32_t start_code;
1895         int ret;
1896
1897         ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1898         emms_c();
1899 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1900 //ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, s->start_mb_y, s->end_mb_y, s->error_count);
1901         if (ret < 0) {
1902             if (c->err_recognition & AV_EF_EXPLODE)
1903                 return ret;
1904             if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1905                 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
1906         } else {
1907             ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_AC_END | ER_DC_END | ER_MV_END);
1908         }
1909
1910         if (s->mb_y == s->end_mb_y)
1911             return 0;
1912
1913         start_code = -1;
1914         buf = avpriv_mpv_find_start_code(buf, s->gb.buffer_end, &start_code);
1915         mb_y= (start_code - SLICE_MIN_START_CODE) << field_pic;
1916         if (s->picture_structure == PICT_BOTTOM_FIELD)
1917             mb_y++;
1918         if (mb_y < 0 || mb_y >= s->end_mb_y)
1919             return -1;
1920     }
1921 }
1922
1923 /**
1924  * Handle slice ends.
1925  * @return 1 if it seems to be the last slice
1926  */
1927 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1928 {
1929     Mpeg1Context *s1 = avctx->priv_data;
1930     MpegEncContext *s = &s1->mpeg_enc_ctx;
1931
1932     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1933         return 0;
1934
1935     if (s->avctx->hwaccel) {
1936         if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1937             av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1938     }
1939
1940     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1941         ff_xvmc_field_end(s);
1942
1943     /* end of slice reached */
1944     if (/*s->mb_y << field_pic == s->mb_height &&*/ !s->first_field && !s->first_slice) {
1945         /* end of image */
1946
1947         s->current_picture_ptr->f.qscale_type = FF_QSCALE_TYPE_MPEG2;
1948
1949         ff_er_frame_end(s);
1950
1951         MPV_frame_end(s);
1952
1953         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
1954             *pict = *(AVFrame*)s->current_picture_ptr;
1955             ff_print_debug_info(s, pict);
1956         } else {
1957             if (avctx->active_thread_type & FF_THREAD_FRAME)
1958                 s->picture_number++;
1959             /* latency of 1 frame for I- and P-frames */
1960             /* XXX: use another variable than picture_number */
1961             if (s->last_picture_ptr != NULL) {
1962                 *pict = *(AVFrame*)s->last_picture_ptr;
1963                  ff_print_debug_info(s, pict);
1964             }
1965         }
1966
1967         return 1;
1968     } else {
1969         return 0;
1970     }
1971 }
1972
1973 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1974                                  const uint8_t *buf, int buf_size)
1975 {
1976     Mpeg1Context *s1 = avctx->priv_data;
1977     MpegEncContext *s = &s1->mpeg_enc_ctx;
1978     int width, height;
1979     int i, v, j;
1980
1981     init_get_bits(&s->gb, buf, buf_size*8);
1982
1983     width  = get_bits(&s->gb, 12);
1984     height = get_bits(&s->gb, 12);
1985     if (width <= 0 || height <= 0)
1986         return -1;
1987     s->aspect_ratio_info = get_bits(&s->gb, 4);
1988     if (s->aspect_ratio_info == 0) {
1989         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1990         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
1991             return -1;
1992     }
1993     s->frame_rate_index = get_bits(&s->gb, 4);
1994     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1995         return -1;
1996     s->bit_rate = get_bits(&s->gb, 18) * 400;
1997     if (get_bits1(&s->gb) == 0) /* marker */
1998         return -1;
1999     s->width  = width;
2000     s->height = height;
2001
2002     s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2003     skip_bits(&s->gb, 1);
2004
2005     /* get matrix */
2006     if (get_bits1(&s->gb)) {
2007         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2008     } else {
2009         for (i = 0; i < 64; i++) {
2010             j = s->dsp.idct_permutation[i];
2011             v = ff_mpeg1_default_intra_matrix[i];
2012             s->intra_matrix[j]        = v;
2013             s->chroma_intra_matrix[j] = v;
2014         }
2015     }
2016     if (get_bits1(&s->gb)) {
2017         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2018     } else {
2019         for (i = 0; i < 64; i++) {
2020             int j = s->dsp.idct_permutation[i];
2021             v = ff_mpeg1_default_non_intra_matrix[i];
2022             s->inter_matrix[j]        = v;
2023             s->chroma_inter_matrix[j] = v;
2024         }
2025     }
2026
2027     if (show_bits(&s->gb, 23) != 0) {
2028         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2029         return -1;
2030     }
2031
2032     /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2033     s->progressive_sequence = 1;
2034     s->progressive_frame    = 1;
2035     s->picture_structure    = PICT_FRAME;
2036     s->first_field          = 0;
2037     s->frame_pred_frame_dct = 1;
2038     s->chroma_format        = 1;
2039     s->codec_id             = s->avctx->codec_id = CODEC_ID_MPEG1VIDEO;
2040     avctx->sub_id           = 1; /* indicates MPEG-1 */
2041     s->out_format           = FMT_MPEG1;
2042     s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2043     if (s->flags & CODEC_FLAG_LOW_DELAY)
2044         s->low_delay = 1;
2045
2046     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2047         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2048                s->avctx->rc_buffer_size, s->bit_rate);
2049
2050     return 0;
2051 }
2052
2053 static int vcr2_init_sequence(AVCodecContext *avctx)
2054 {
2055     Mpeg1Context *s1 = avctx->priv_data;
2056     MpegEncContext *s = &s1->mpeg_enc_ctx;
2057     int i, v;
2058
2059     /* start new MPEG-1 context decoding */
2060     s->out_format = FMT_MPEG1;
2061     if (s1->mpeg_enc_ctx_allocated) {
2062         MPV_common_end(s);
2063     }
2064     s->width  = avctx->coded_width;
2065     s->height = avctx->coded_height;
2066     avctx->has_b_frames = 0; // true?
2067     s->low_delay = 1;
2068
2069     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2070     avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2071
2072     if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel )
2073         if (avctx->idct_algo == FF_IDCT_AUTO)
2074             avctx->idct_algo = FF_IDCT_SIMPLE;
2075
2076     if (MPV_common_init(s) < 0)
2077         return -1;
2078     s1->mpeg_enc_ctx_allocated = 1;
2079
2080     for (i = 0; i < 64; i++) {
2081         int j = s->dsp.idct_permutation[i];
2082         v = ff_mpeg1_default_intra_matrix[i];
2083         s->intra_matrix[j]        = v;
2084         s->chroma_intra_matrix[j] = v;
2085
2086         v = ff_mpeg1_default_non_intra_matrix[i];
2087         s->inter_matrix[j]        = v;
2088         s->chroma_inter_matrix[j] = v;
2089     }
2090
2091     s->progressive_sequence  = 1;
2092     s->progressive_frame     = 1;
2093     s->picture_structure     = PICT_FRAME;
2094     s->first_field           = 0;
2095     s->frame_pred_frame_dct  = 1;
2096     s->chroma_format         = 1;
2097     if (s->codec_tag == AV_RL32("BW10")) {
2098         s->codec_id              = s->avctx->codec_id = CODEC_ID_MPEG1VIDEO;
2099         avctx->sub_id            = 1; /* indicates MPEG-1 */
2100     } else {
2101         exchange_uv(s); // common init reset pblocks, so we swap them here
2102         s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2103         s->codec_id              = s->avctx->codec_id = CODEC_ID_MPEG2VIDEO;
2104         avctx->sub_id            = 2; /* indicates MPEG-2 */
2105     }
2106     s1->save_width           = s->width;
2107     s1->save_height          = s->height;
2108     s1->save_progressive_seq = s->progressive_sequence;
2109     return 0;
2110 }
2111
2112
2113 static void mpeg_decode_user_data(AVCodecContext *avctx,
2114                                   const uint8_t *p, int buf_size)
2115 {
2116     Mpeg1Context *s = avctx->priv_data;
2117     const uint8_t *buf_end = p + buf_size;
2118
2119     if(buf_size > 29){
2120         int i;
2121         for(i=0; i<20; i++)
2122             if(!memcmp(p+i, "\0TMPGEXS\0", 9)){
2123                 s->tmpgexs= 1;
2124             }
2125
2126 /*        for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2127             av_log(0,0, "%c", p[i]);
2128         }
2129             av_log(0,0, "\n");*/
2130     }
2131
2132     /* we parse the DTG active format information */
2133     if (buf_end - p >= 5 &&
2134         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2135         int flags = p[4];
2136         p += 5;
2137         if (flags & 0x80) {
2138             /* skip event id */
2139             p += 2;
2140         }
2141         if (flags & 0x40) {
2142             if (buf_end - p < 1)
2143                 return;
2144             avctx->dtg_active_format = p[0] & 0x0f;
2145         }
2146     }
2147 }
2148
2149 static void mpeg_decode_gop(AVCodecContext *avctx,
2150                             const uint8_t *buf, int buf_size)
2151 {
2152     Mpeg1Context *s1  = avctx->priv_data;
2153     MpegEncContext *s = &s1->mpeg_enc_ctx;
2154     int broken_link;
2155     int64_t tc;
2156
2157     init_get_bits(&s->gb, buf, buf_size*8);
2158
2159     tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2160
2161     s->closed_gop = get_bits1(&s->gb);
2162     /*broken_link indicate that after editing the
2163       reference frames of the first B-Frames after GOP I-Frame
2164       are missing (open gop)*/
2165     broken_link = get_bits1(&s->gb);
2166
2167     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2168         int time_code_hours    = tc>>19 & 0x1f;
2169         int time_code_minutes  = tc>>13 & 0x3f;
2170         int time_code_seconds  = tc>>6  & 0x3f;
2171         int drop_frame_flag    = tc     & 1<<24;
2172         int time_code_pictures = tc     & 0x3f;
2173         av_log(s->avctx, AV_LOG_DEBUG, "GOP (%02d:%02d:%02d%c%02d) closed_gop=%d broken_link=%d\n",
2174                time_code_hours, time_code_minutes, time_code_seconds,
2175                drop_frame_flag ? ';' : ':',
2176                time_code_pictures, s->closed_gop, broken_link);
2177     }
2178 }
2179 /**
2180  * Find the end of the current frame in the bitstream.
2181  * @return the position of the first byte of the next frame, or -1
2182  */
2183 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2184 {
2185     int i;
2186     uint32_t state = pc->state;
2187
2188     /* EOF considered as end of frame */
2189     if (buf_size == 0)
2190         return 0;
2191
2192 /*
2193  0  frame start         -> 1/4
2194  1  first_SEQEXT        -> 0/2
2195  2  first field start   -> 3/0
2196  3  second_SEQEXT       -> 2/0
2197  4  searching end
2198 */
2199
2200     for (i = 0; i < buf_size; i++) {
2201         assert(pc->frame_start_found >= 0 && pc->frame_start_found <= 4);
2202         if (pc->frame_start_found & 1) {
2203             if (state == EXT_START_CODE && (buf[i] & 0xF0) != 0x80)
2204                 pc->frame_start_found--;
2205             else if (state == EXT_START_CODE + 2) {
2206                 if ((buf[i] & 3) == 3)
2207                     pc->frame_start_found = 0;
2208                 else
2209                     pc->frame_start_found = (pc->frame_start_found + 1) & 3;
2210             }
2211             state++;
2212         } else {
2213             i = avpriv_mpv_find_start_code(buf + i, buf + buf_size, &state) - buf - 1;
2214             if (pc->frame_start_found == 0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE) {
2215                 i++;
2216                 pc->frame_start_found = 4;
2217             }
2218             if (state == SEQ_END_CODE) {
2219                 pc->state=-1;
2220                 return i+1;
2221             }
2222             if (pc->frame_start_found == 2 && state == SEQ_START_CODE)
2223                 pc->frame_start_found = 0;
2224             if (pc->frame_start_found  < 4 && state == EXT_START_CODE)
2225                 pc->frame_start_found++;
2226             if (pc->frame_start_found == 4 && (state & 0xFFFFFF00) == 0x100) {
2227                 if (state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE) {
2228                     pc->frame_start_found = 0;
2229                     pc->state             = -1;
2230                     return i - 3;
2231                 }
2232             }
2233             if (pc->frame_start_found == 0 && s && state == PICTURE_START_CODE) {
2234                 ff_fetch_timestamp(s, i - 3, 1);
2235             }
2236         }
2237     }
2238     pc->state = state;
2239     return END_NOT_FOUND;
2240 }
2241
2242 static int decode_chunks(AVCodecContext *avctx,
2243                          AVFrame *picture, int *data_size,
2244                          const uint8_t *buf, int buf_size);
2245
2246 /* handle buffering and image synchronisation */
2247 static int mpeg_decode_frame(AVCodecContext *avctx,
2248                              void *data, int *data_size,
2249                              AVPacket *avpkt)
2250 {
2251     const uint8_t *buf = avpkt->data;
2252     int buf_size = avpkt->size;
2253     Mpeg1Context *s = avctx->priv_data;
2254     AVFrame *picture = data;
2255     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2256     av_dlog(avctx, "fill_buffer\n");
2257
2258     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2259         /* special case for last picture */
2260         if (s2->low_delay == 0 && s2->next_picture_ptr) {
2261             *picture = *(AVFrame*)s2->next_picture_ptr;
2262             s2->next_picture_ptr = NULL;
2263
2264             *data_size = sizeof(AVFrame);
2265         }
2266         return buf_size;
2267     }
2268
2269     if (s2->flags & CODEC_FLAG_TRUNCATED) {
2270         int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2271
2272         if (ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0)
2273             return buf_size;
2274     }
2275
2276     s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2277     if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2278                                            || s2->codec_tag == AV_RL32("BW10")
2279                                           ))
2280         vcr2_init_sequence(avctx);
2281
2282     s->slice_count = 0;
2283
2284     if (avctx->extradata && !avctx->frame_number) {
2285         int ret = decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2286         if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
2287             return ret;
2288     }
2289
2290     return decode_chunks(avctx, picture, data_size, buf, buf_size);
2291 }
2292
2293 static int decode_chunks(AVCodecContext *avctx,
2294                          AVFrame *picture, int *data_size,
2295                          const uint8_t *buf, int buf_size)
2296 {
2297     Mpeg1Context *s = avctx->priv_data;
2298     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2299     const uint8_t *buf_ptr = buf;
2300     const uint8_t *buf_end = buf + buf_size;
2301     int ret, input_size;
2302     int last_code = 0;
2303
2304     for (;;) {
2305         /* find next start code */
2306         uint32_t start_code = -1;
2307         buf_ptr = avpriv_mpv_find_start_code(buf_ptr, buf_end, &start_code);
2308         if (start_code > 0x1ff) {
2309             if (s2->pict_type != AV_PICTURE_TYPE_B || avctx->skip_frame <= AVDISCARD_DEFAULT) {
2310                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2311                     int i;
2312                     av_assert0(avctx->thread_count > 1);
2313
2314                     avctx->execute(avctx, slice_decode_thread,  &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
2315                     for (i = 0; i < s->slice_count; i++)
2316                         s2->error_count += s2->thread_context[i]->error_count;
2317                 }
2318
2319                 if (CONFIG_VDPAU && uses_vdpau(avctx))
2320                     ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2321
2322
2323                 if (slice_end(avctx, picture)) {
2324                     if (s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2325                         *data_size = sizeof(AVPicture);
2326                 }
2327             }
2328             s2->pict_type = 0;
2329             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2330         }
2331
2332         input_size = buf_end - buf_ptr;
2333
2334         if (avctx->debug & FF_DEBUG_STARTCODE) {
2335             av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2336         }
2337
2338         /* prepare data for next start code */
2339         switch (start_code) {
2340         case SEQ_START_CODE:
2341             if (last_code == 0) {
2342                 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2343                 if(buf != avctx->extradata)
2344                     s->sync=1;
2345             } else {
2346                 av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2347                 if (avctx->err_recognition & AV_EF_EXPLODE)
2348                     return AVERROR_INVALIDDATA;
2349             }
2350             break;
2351
2352         case PICTURE_START_CODE:
2353             if(s->tmpgexs){
2354                 s2->intra_dc_precision= 3;
2355                 s2->intra_matrix[0]= 1;
2356             }
2357             if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) && s->slice_count) {
2358                 int i;
2359
2360                 avctx->execute(avctx, slice_decode_thread,
2361                                s2->thread_context, NULL,
2362                                s->slice_count, sizeof(void*));
2363                 for (i = 0; i < s->slice_count; i++)
2364                     s2->error_count += s2->thread_context[i]->error_count;
2365                 s->slice_count = 0;
2366             }
2367             if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2368                 ret = mpeg_decode_postinit(avctx);
2369                 if (ret < 0) {
2370                     av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
2371                     return ret;
2372                 }
2373
2374                 /* we have a complete image: we try to decompress it */
2375                 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2376                     s2->pict_type = 0;
2377                 s2->first_slice = 1;
2378                 last_code = PICTURE_START_CODE;
2379             } else {
2380                 av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
2381                 if (avctx->err_recognition & AV_EF_EXPLODE)
2382                     return AVERROR_INVALIDDATA;
2383             }
2384             break;
2385         case EXT_START_CODE:
2386             init_get_bits(&s2->gb, buf_ptr, input_size*8);
2387
2388             switch (get_bits(&s2->gb, 4)) {
2389             case 0x1:
2390                 if (last_code == 0) {
2391                 mpeg_decode_sequence_extension(s);
2392                 } else {
2393                     av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
2394                     if (avctx->err_recognition & AV_EF_EXPLODE)
2395                         return AVERROR_INVALIDDATA;
2396                 }
2397                 break;
2398             case 0x2:
2399                 mpeg_decode_sequence_display_extension(s);
2400                 break;
2401             case 0x3:
2402                 mpeg_decode_quant_matrix_extension(s2);
2403                 break;
2404             case 0x7:
2405                 mpeg_decode_picture_display_extension(s);
2406                 break;
2407             case 0x8:
2408                 if (last_code == PICTURE_START_CODE) {
2409                     mpeg_decode_picture_coding_extension(s);
2410                 } else {
2411                     av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
2412                     if (avctx->err_recognition & AV_EF_EXPLODE)
2413                         return AVERROR_INVALIDDATA;
2414                 }
2415                 break;
2416             }
2417             break;
2418         case USER_START_CODE:
2419             mpeg_decode_user_data(avctx, buf_ptr, input_size);
2420             break;
2421         case GOP_START_CODE:
2422             if (last_code == 0) {
2423                 s2->first_field=0;
2424                 mpeg_decode_gop(avctx, buf_ptr, input_size);
2425                 s->sync=1;
2426             } else {
2427                 av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
2428                 if (avctx->err_recognition & AV_EF_EXPLODE)
2429                     return AVERROR_INVALIDDATA;
2430             }
2431             break;
2432         default:
2433             if (start_code >= SLICE_MIN_START_CODE &&
2434                 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2435                 const int field_pic = s2->picture_structure != PICT_FRAME;
2436                 int mb_y = (start_code - SLICE_MIN_START_CODE) << field_pic;
2437                 last_code = SLICE_MIN_START_CODE;
2438
2439                 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2440                     mb_y++;
2441
2442                 if (mb_y >= s2->mb_height) {
2443                     av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2444                     return -1;
2445                 }
2446
2447                 if (s2->last_picture_ptr == NULL) {
2448                 /* Skip B-frames if we do not have reference frames and gop is not closed */
2449                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
2450                         if (!s2->closed_gop)
2451                             break;
2452                     }
2453                 }
2454                 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
2455                     s->sync=1;
2456                 if (s2->next_picture_ptr == NULL) {
2457                 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2458                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) break;
2459                 }
2460                 if ((avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type == AV_PICTURE_TYPE_B) ||
2461                     (avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type != AV_PICTURE_TYPE_I) ||
2462                      avctx->skip_frame >= AVDISCARD_ALL)
2463                     break;
2464
2465                 if (!s->mpeg_enc_ctx_allocated)
2466                     break;
2467
2468                 if (s2->codec_id == CODEC_ID_MPEG2VIDEO) {
2469                     if (mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2470                         break;
2471                 }
2472
2473                 if (!s2->pict_type) {
2474                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2475                     if (avctx->err_recognition & AV_EF_EXPLODE)
2476                         return AVERROR_INVALIDDATA;
2477                     break;
2478                 }
2479
2480                 if (s2->first_slice) {
2481                     s2->first_slice = 0;
2482                     if (mpeg_field_start(s2, buf, buf_size) < 0)
2483                         return -1;
2484                 }
2485                 if (!s2->current_picture_ptr) {
2486                     av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2487                     return AVERROR_INVALIDDATA;
2488                 }
2489
2490                 if (uses_vdpau(avctx)) {
2491                     s->slice_count++;
2492                     break;
2493                 }
2494
2495                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2496                     int threshold = (s2->mb_height * s->slice_count +
2497                                      s2->slice_context_count / 2) /
2498                                     s2->slice_context_count;
2499                     av_assert0(avctx->thread_count > 1);
2500                     if (threshold <= mb_y) {
2501                         MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2502
2503                         thread_context->start_mb_y = mb_y;
2504                         thread_context->end_mb_y   = s2->mb_height;
2505                         if (s->slice_count) {
2506                             s2->thread_context[s->slice_count-1]->end_mb_y = mb_y;
2507                             ff_update_duplicate_context(thread_context, s2);
2508                         }
2509                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2510                         s->slice_count++;
2511                     }
2512                     buf_ptr += 2; // FIXME add minimum number of bytes per slice
2513                 } else {
2514                     ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2515                     emms_c();
2516
2517                     if (ret < 0) {
2518                         if (avctx->err_recognition & AV_EF_EXPLODE)
2519                             return ret;
2520                         if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2521                             ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2522                     } else {
2523                         ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x-1, s2->mb_y, ER_AC_END | ER_DC_END | ER_MV_END);
2524                     }
2525                 }
2526             }
2527             break;
2528         }
2529     }
2530 }
2531
2532 static void flush(AVCodecContext *avctx)
2533 {
2534     Mpeg1Context *s = avctx->priv_data;
2535
2536     s->sync=0;
2537
2538     ff_mpeg_flush(avctx);
2539 }
2540
2541 static int mpeg_decode_end(AVCodecContext *avctx)
2542 {
2543     Mpeg1Context *s = avctx->priv_data;
2544
2545     if (s->mpeg_enc_ctx_allocated)
2546         MPV_common_end(&s->mpeg_enc_ctx);
2547     return 0;
2548 }
2549
2550 static const AVProfile mpeg2_video_profiles[] = {
2551     { FF_PROFILE_MPEG2_422,          "4:2:2"              },
2552     { FF_PROFILE_MPEG2_HIGH,         "High"               },
2553     { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
2554     { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
2555     { FF_PROFILE_MPEG2_MAIN,         "Main"               },
2556     { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
2557     { FF_PROFILE_RESERVED,           "Reserved"           },
2558     { FF_PROFILE_RESERVED,           "Reserved"           },
2559     { FF_PROFILE_UNKNOWN },
2560 };
2561
2562
2563 AVCodec ff_mpeg1video_decoder = {
2564     .name           = "mpeg1video",
2565     .type           = AVMEDIA_TYPE_VIDEO,
2566     .id             = CODEC_ID_MPEG1VIDEO,
2567     .priv_data_size = sizeof(Mpeg1Context),
2568     .init           = mpeg_decode_init,
2569     .close          = mpeg_decode_end,
2570     .decode         = mpeg_decode_frame,
2571     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2572     .flush          = flush,
2573     .max_lowres     = 3,
2574     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2575     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2576 };
2577
2578 AVCodec ff_mpeg2video_decoder = {
2579     .name           = "mpeg2video",
2580     .type           = AVMEDIA_TYPE_VIDEO,
2581     .id             = CODEC_ID_MPEG2VIDEO,
2582     .priv_data_size = sizeof(Mpeg1Context),
2583     .init           = mpeg_decode_init,
2584     .close          = mpeg_decode_end,
2585     .decode         = mpeg_decode_frame,
2586     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2587     .flush          = flush,
2588     .max_lowres     = 3,
2589     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2590     .profiles       = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2591 };
2592
2593 //legacy decoder
2594 AVCodec ff_mpegvideo_decoder = {
2595     .name           = "mpegvideo",
2596     .type           = AVMEDIA_TYPE_VIDEO,
2597     .id             = CODEC_ID_MPEG2VIDEO,
2598     .priv_data_size = sizeof(Mpeg1Context),
2599     .init           = mpeg_decode_init,
2600     .close          = mpeg_decode_end,
2601     .decode         = mpeg_decode_frame,
2602     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2603     .flush          = flush,
2604     .max_lowres     = 3,
2605     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2606 };
2607
2608 #if CONFIG_MPEG_XVMC_DECODER
2609 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2610 {
2611     if (avctx->active_thread_type & FF_THREAD_SLICE)
2612         return -1;
2613     if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2614         return -1;
2615     if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2616         av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2617     }
2618     mpeg_decode_init(avctx);
2619
2620     avctx->pix_fmt           = PIX_FMT_XVMC_MPEG2_IDCT;
2621     avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2622
2623     return 0;
2624 }
2625
2626 AVCodec ff_mpeg_xvmc_decoder = {
2627     .name           = "mpegvideo_xvmc",
2628     .type           = AVMEDIA_TYPE_VIDEO,
2629     .id             = CODEC_ID_MPEG2VIDEO_XVMC,
2630     .priv_data_size = sizeof(Mpeg1Context),
2631     .init           = mpeg_mc_decode_init,
2632     .close          = mpeg_decode_end,
2633     .decode         = mpeg_decode_frame,
2634     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2635     .flush          = flush,
2636     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2637 };
2638
2639 #endif
2640
2641 #if CONFIG_MPEG_VDPAU_DECODER
2642 AVCodec ff_mpeg_vdpau_decoder = {
2643     .name           = "mpegvideo_vdpau",
2644     .type           = AVMEDIA_TYPE_VIDEO,
2645     .id             = CODEC_ID_MPEG2VIDEO,
2646     .priv_data_size = sizeof(Mpeg1Context),
2647     .init           = mpeg_decode_init,
2648     .close          = mpeg_decode_end,
2649     .decode         = mpeg_decode_frame,
2650     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2651     .flush          = flush,
2652     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2653 };
2654 #endif
2655
2656 #if CONFIG_MPEG1_VDPAU_DECODER
2657 AVCodec ff_mpeg1_vdpau_decoder = {
2658     .name           = "mpeg1video_vdpau",
2659     .type           = AVMEDIA_TYPE_VIDEO,
2660     .id             = CODEC_ID_MPEG1VIDEO,
2661     .priv_data_size = sizeof(Mpeg1Context),
2662     .init           = mpeg_decode_init,
2663     .close          = mpeg_decode_end,
2664     .decode         = mpeg_decode_frame,
2665     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2666     .flush          = flush,
2667     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2668 };
2669 #endif
2670