Merge remote-tracking branch 'dwbuiten/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 #include "libavutil/timecode.h"
37
38 #include "mpeg12.h"
39 #include "mpeg12data.h"
40 #include "mpeg12decdata.h"
41 #include "bytestream.h"
42 #include "vdpau_internal.h"
43 #include "xvmc_internal.h"
44 #include "thread.h"
45
46
47 #define MV_VLC_BITS 9
48 #define MBINCR_VLC_BITS 9
49 #define MB_PAT_VLC_BITS 9
50 #define MB_PTYPE_VLC_BITS 6
51 #define MB_BTYPE_VLC_BITS 6
52
53 static VLC mv_vlc;
54
55 /* as H.263, but only 17 codes */
56 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
57 {
58     int code, sign, val, shift;
59
60     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
61     if (code == 0) {
62         return pred;
63     }
64     if (code < 0) {
65         return 0xffff;
66     }
67
68     sign  = get_bits1(&s->gb);
69     shift = fcode - 1;
70     val   = code;
71     if (shift) {
72         val  = (val - 1) << shift;
73         val |= get_bits(&s->gb, shift);
74         val++;
75     }
76     if (sign)
77         val = -val;
78     val += pred;
79
80     /* modulo decoding */
81     return sign_extend(val, 5 + shift);
82 }
83
84 static inline int mpeg1_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n)
85 {
86     int level, dc, diff, i, j, run;
87     int component;
88     RLTable *rl = &ff_rl_mpeg1;
89     uint8_t * const scantable    = s->intra_scantable.permutated;
90     const uint16_t *quant_matrix = s->intra_matrix;
91     const int qscale             = s->qscale;
92
93     /* DC coefficient */
94     component = (n <= 3 ? 0 : n - 4 + 1);
95     diff = decode_dc(&s->gb, component);
96     if (diff >= 0xffff)
97         return -1;
98     dc  = s->last_dc[component];
99     dc += diff;
100     s->last_dc[component] = dc;
101     block[0] = dc * quant_matrix[0];
102     av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
103     i = 0;
104     {
105         OPEN_READER(re, &s->gb);
106         /* now quantify & encode AC coefficients */
107         for (;;) {
108             UPDATE_CACHE(re, &s->gb);
109             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
110
111             if (level == 127) {
112                 break;
113             } else if (level != 0) {
114                 i += run;
115                 j = scantable[i];
116                 level = (level * qscale * quant_matrix[j]) >> 4;
117                 level = (level - 1) | 1;
118                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
119                 LAST_SKIP_BITS(re, &s->gb, 1);
120             } else {
121                 /* escape */
122                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
123                 UPDATE_CACHE(re, &s->gb);
124                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
125                 if (level == -128) {
126                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
127                 } else if (level == 0) {
128                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
129                 }
130                 i += run;
131                 j = scantable[i];
132                 if (level < 0) {
133                     level = -level;
134                     level = (level * qscale * quant_matrix[j]) >> 4;
135                     level = (level - 1) | 1;
136                     level = -level;
137                 } else {
138                     level = (level * qscale * quant_matrix[j]) >> 4;
139                     level = (level - 1) | 1;
140                 }
141             }
142             if (i > 63) {
143                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
144                 return -1;
145             }
146
147             block[j] = level;
148         }
149         CLOSE_READER(re, &s->gb);
150     }
151     s->block_last_index[n] = i;
152    return 0;
153 }
154
155 int ff_mpeg1_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n)
156 {
157     return mpeg1_decode_block_intra(s, block, n);
158 }
159
160 static inline int mpeg1_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
161 {
162     int level, i, j, run;
163     RLTable *rl = &ff_rl_mpeg1;
164     uint8_t * const scantable    = s->intra_scantable.permutated;
165     const uint16_t *quant_matrix = s->inter_matrix;
166     const int qscale             = s->qscale;
167
168     {
169         OPEN_READER(re, &s->gb);
170         i = -1;
171         // special case for first coefficient, no need to add second VLC table
172         UPDATE_CACHE(re, &s->gb);
173         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
174             level = (3 * qscale * quant_matrix[0]) >> 5;
175             level = (level - 1) | 1;
176             if (GET_CACHE(re, &s->gb) & 0x40000000)
177                 level = -level;
178             block[0] = level;
179             i++;
180             SKIP_BITS(re, &s->gb, 2);
181             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
182                 goto end;
183         }
184         /* now quantify & encode AC coefficients */
185         for (;;) {
186             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
187
188             if (level != 0) {
189                 i += run;
190                 j = scantable[i];
191                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
192                 level = (level - 1) | 1;
193                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
194                 SKIP_BITS(re, &s->gb, 1);
195             } else {
196                 /* escape */
197                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
198                 UPDATE_CACHE(re, &s->gb);
199                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
200                 if (level == -128) {
201                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
202                 } else if (level == 0) {
203                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
204                 }
205                 i += run;
206                 j = scantable[i];
207                 if (level < 0) {
208                     level = -level;
209                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
210                     level = (level - 1) | 1;
211                     level = -level;
212                 } else {
213                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
214                     level = (level - 1) | 1;
215                 }
216             }
217             if (i > 63) {
218                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
219                 return -1;
220             }
221
222             block[j] = level;
223             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
224                 break;
225             UPDATE_CACHE(re, &s->gb);
226         }
227 end:
228         LAST_SKIP_BITS(re, &s->gb, 2);
229         CLOSE_READER(re, &s->gb);
230     }
231     s->block_last_index[n] = i;
232     return 0;
233 }
234
235 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
236 {
237     int level, i, j, run;
238     RLTable *rl = &ff_rl_mpeg1;
239     uint8_t * const scantable = s->intra_scantable.permutated;
240     const int qscale          = s->qscale;
241
242     {
243         OPEN_READER(re, &s->gb);
244         i = -1;
245         // special case for first coefficient, no need to add second VLC table
246         UPDATE_CACHE(re, &s->gb);
247         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
248             level = (3 * qscale) >> 1;
249             level = (level - 1) | 1;
250             if (GET_CACHE(re, &s->gb) & 0x40000000)
251                 level = -level;
252             block[0] = level;
253             i++;
254             SKIP_BITS(re, &s->gb, 2);
255             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
256                 goto end;
257         }
258
259         /* now quantify & encode AC coefficients */
260         for (;;) {
261             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
262
263             if (level != 0) {
264                 i += run;
265                 j = scantable[i];
266                 level = ((level * 2 + 1) * qscale) >> 1;
267                 level = (level - 1) | 1;
268                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
269                 SKIP_BITS(re, &s->gb, 1);
270             } else {
271                 /* escape */
272                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
273                 UPDATE_CACHE(re, &s->gb);
274                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
275                 if (level == -128) {
276                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
277                 } else if (level == 0) {
278                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
279                 }
280                 i += run;
281                 j = scantable[i];
282                 if (level < 0) {
283                     level = -level;
284                     level = ((level * 2 + 1) * qscale) >> 1;
285                     level = (level - 1) | 1;
286                     level = -level;
287                 } else {
288                     level = ((level * 2 + 1) * qscale) >> 1;
289                     level = (level - 1) | 1;
290                 }
291             }
292
293             block[j] = level;
294             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
295                 break;
296             UPDATE_CACHE(re, &s->gb);
297         }
298 end:
299         LAST_SKIP_BITS(re, &s->gb, 2);
300         CLOSE_READER(re, &s->gb);
301     }
302     s->block_last_index[n] = i;
303     return 0;
304 }
305
306
307 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n)
308 {
309     int level, i, j, run;
310     RLTable *rl = &ff_rl_mpeg1;
311     uint8_t * const scantable = s->intra_scantable.permutated;
312     const uint16_t *quant_matrix;
313     const int qscale = s->qscale;
314     int mismatch;
315
316     mismatch = 1;
317
318     {
319         OPEN_READER(re, &s->gb);
320         i = -1;
321         if (n < 4)
322             quant_matrix = s->inter_matrix;
323         else
324             quant_matrix = s->chroma_inter_matrix;
325
326         // special case for first coefficient, no need to add second VLC table
327         UPDATE_CACHE(re, &s->gb);
328         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
329             level= (3 * qscale * quant_matrix[0]) >> 5;
330             if (GET_CACHE(re, &s->gb) & 0x40000000)
331                 level = -level;
332             block[0]  = level;
333             mismatch ^= level;
334             i++;
335             SKIP_BITS(re, &s->gb, 2);
336             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
337                 goto end;
338         }
339
340         /* now quantify & encode AC coefficients */
341         for (;;) {
342             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
343
344             if (level != 0) {
345                 i += run;
346                 j = scantable[i];
347                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
348                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
349                 SKIP_BITS(re, &s->gb, 1);
350             } else {
351                 /* escape */
352                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
353                 UPDATE_CACHE(re, &s->gb);
354                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
355
356                 i += run;
357                 j = scantable[i];
358                 if (level < 0) {
359                     level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
360                     level = -level;
361                 } else {
362                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
363                 }
364             }
365             if (i > 63) {
366                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
367                 return -1;
368             }
369
370             mismatch ^= level;
371             block[j]  = level;
372             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
373                 break;
374             UPDATE_CACHE(re, &s->gb);
375         }
376 end:
377         LAST_SKIP_BITS(re, &s->gb, 2);
378         CLOSE_READER(re, &s->gb);
379     }
380     block[63] ^= (mismatch & 1);
381
382     s->block_last_index[n] = i;
383     return 0;
384 }
385
386 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
387                                                     DCTELEM *block, int n)
388 {
389     int level, i, j, run;
390     RLTable *rl = &ff_rl_mpeg1;
391     uint8_t * const scantable = s->intra_scantable.permutated;
392     const int qscale          = s->qscale;
393     OPEN_READER(re, &s->gb);
394     i = -1;
395
396     // special case for first coefficient, no need to add second VLC table
397     UPDATE_CACHE(re, &s->gb);
398     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
399         level = (3 * qscale) >> 1;
400         if (GET_CACHE(re, &s->gb) & 0x40000000)
401             level = -level;
402         block[0] = level;
403         i++;
404         SKIP_BITS(re, &s->gb, 2);
405         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
406             goto end;
407     }
408
409     /* now quantify & encode AC coefficients */
410     for (;;) {
411         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
412
413         if (level != 0) {
414             i += run;
415             j  = scantable[i];
416             level = ((level * 2 + 1) * qscale) >> 1;
417             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
418             SKIP_BITS(re, &s->gb, 1);
419         } else {
420             /* escape */
421             run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
422             UPDATE_CACHE(re, &s->gb);
423             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
424
425             i += run;
426             j  = scantable[i];
427             if (level < 0) {
428                 level = ((-level * 2 + 1) * qscale) >> 1;
429                 level = -level;
430             } else {
431                 level = ((level * 2 + 1) * qscale) >> 1;
432             }
433         }
434
435         block[j] = level;
436         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
437             break;
438         UPDATE_CACHE(re, &s->gb);
439     }
440 end:
441     LAST_SKIP_BITS(re, &s->gb, 2);
442     CLOSE_READER(re, &s->gb);
443     s->block_last_index[n] = i;
444     return 0;
445 }
446
447
448 static inline int mpeg2_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n)
449 {
450     int level, dc, diff, i, j, run;
451     int component;
452     RLTable *rl;
453     uint8_t * const scantable = s->intra_scantable.permutated;
454     const uint16_t *quant_matrix;
455     const int qscale = s->qscale;
456     int mismatch;
457
458     /* DC coefficient */
459     if (n < 4) {
460         quant_matrix = s->intra_matrix;
461         component = 0;
462     } else {
463         quant_matrix = s->chroma_intra_matrix;
464         component = (n & 1) + 1;
465     }
466     diff = decode_dc(&s->gb, component);
467     if (diff >= 0xffff)
468         return -1;
469     dc  = s->last_dc[component];
470     dc += diff;
471     s->last_dc[component] = dc;
472     block[0] = dc << (3 - s->intra_dc_precision);
473     av_dlog(s->avctx, "dc=%d\n", block[0]);
474     mismatch = block[0] ^ 1;
475     i = 0;
476     if (s->intra_vlc_format)
477         rl = &ff_rl_mpeg2;
478     else
479         rl = &ff_rl_mpeg1;
480
481     {
482         OPEN_READER(re, &s->gb);
483         /* now quantify & encode AC coefficients */
484         for (;;) {
485             UPDATE_CACHE(re, &s->gb);
486             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
487
488             if (level == 127) {
489                 break;
490             } else if (level != 0) {
491                 i += run;
492                 j  = scantable[i];
493                 level = (level * qscale * quant_matrix[j]) >> 4;
494                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
495                 LAST_SKIP_BITS(re, &s->gb, 1);
496             } else {
497                 /* escape */
498                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
499                 UPDATE_CACHE(re, &s->gb);
500                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
501                 i += run;
502                 j  = scantable[i];
503                 if (level < 0) {
504                     level = (-level * qscale * quant_matrix[j]) >> 4;
505                     level = -level;
506                 } else {
507                     level = (level * qscale * quant_matrix[j]) >> 4;
508                 }
509             }
510             if (i > 63) {
511                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
512                 return -1;
513             }
514
515             mismatch ^= level;
516             block[j]  = level;
517         }
518         CLOSE_READER(re, &s->gb);
519     }
520     block[63] ^= mismatch & 1;
521
522     s->block_last_index[n] = i;
523     return 0;
524 }
525
526 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n)
527 {
528     int level, dc, diff, j, run;
529     int component;
530     RLTable *rl;
531     uint8_t * scantable = s->intra_scantable.permutated;
532     const uint16_t *quant_matrix;
533     const int qscale = s->qscale;
534
535     /* DC coefficient */
536     if (n < 4) {
537         quant_matrix = s->intra_matrix;
538         component = 0;
539     } else {
540         quant_matrix = s->chroma_intra_matrix;
541         component = (n & 1) + 1;
542     }
543     diff = decode_dc(&s->gb, component);
544     if (diff >= 0xffff)
545         return -1;
546     dc = s->last_dc[component];
547     dc += diff;
548     s->last_dc[component] = dc;
549     block[0] = dc << (3 - s->intra_dc_precision);
550     if (s->intra_vlc_format)
551         rl = &ff_rl_mpeg2;
552     else
553         rl = &ff_rl_mpeg1;
554
555     {
556         OPEN_READER(re, &s->gb);
557         /* now quantify & encode AC coefficients */
558         for (;;) {
559             UPDATE_CACHE(re, &s->gb);
560             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
561
562             if (level == 127) {
563                 break;
564             } else if (level != 0) {
565                 scantable += run;
566                 j = *scantable;
567                 level = (level * qscale * quant_matrix[j]) >> 4;
568                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
569                 LAST_SKIP_BITS(re, &s->gb, 1);
570             } else {
571                 /* escape */
572                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
573                 UPDATE_CACHE(re, &s->gb);
574                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
575                 scantable += run;
576                 j = *scantable;
577                 if (level < 0) {
578                     level = (-level * qscale * quant_matrix[j]) >> 4;
579                     level = -level;
580                 } else {
581                     level = (level * qscale * quant_matrix[j]) >> 4;
582                 }
583             }
584
585             block[j] = level;
586         }
587         CLOSE_READER(re, &s->gb);
588     }
589
590     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
591     return 0;
592 }
593
594 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
595
596 #define INIT_2D_VLC_RL(rl, static_size)\
597 {\
598     static RL_VLC_ELEM rl_vlc_table[static_size];\
599     INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
600                     &rl.table_vlc[0][1], 4, 2,\
601                     &rl.table_vlc[0][0], 4, 2, static_size);\
602 \
603     rl.rl_vlc[0] = rl_vlc_table;\
604     init_2d_vlc_rl(&rl);\
605 }
606
607 static void init_2d_vlc_rl(RLTable *rl)
608 {
609     int i;
610
611     for (i = 0; i < rl->vlc.table_size; i++) {
612         int code = rl->vlc.table[i][0];
613         int len  = rl->vlc.table[i][1];
614         int level, run;
615
616         if (len == 0) { // illegal code
617             run   = 65;
618             level = MAX_LEVEL;
619         } else if (len<0) { //more bits needed
620             run   = 0;
621             level = code;
622         } else {
623             if (code == rl->n) { //esc
624                 run   = 65;
625                 level = 0;
626             } else if (code == rl->n+1) { //eob
627                 run   = 0;
628                 level = 127;
629             } else {
630                 run   = rl->table_run  [code] + 1;
631                 level = rl->table_level[code];
632             }
633         }
634         rl->rl_vlc[0][i].len   = len;
635         rl->rl_vlc[0][i].level = level;
636         rl->rl_vlc[0][i].run   = run;
637     }
638 }
639
640 void ff_mpeg12_common_init(MpegEncContext *s)
641 {
642
643     s->y_dc_scale_table =
644     s->c_dc_scale_table = ff_mpeg2_dc_scale_table[s->intra_dc_precision];
645
646 }
647
648 void ff_mpeg1_clean_buffers(MpegEncContext *s)
649 {
650     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
651     s->last_dc[1] = s->last_dc[0];
652     s->last_dc[2] = s->last_dc[0];
653     memset(s->last_mv, 0, sizeof(s->last_mv));
654 }
655
656
657 /******************************************/
658 /* decoding */
659
660 VLC ff_dc_lum_vlc;
661 VLC ff_dc_chroma_vlc;
662
663 static VLC mbincr_vlc;
664 static VLC mb_ptype_vlc;
665 static VLC mb_btype_vlc;
666 static VLC mb_pat_vlc;
667
668 av_cold void ff_mpeg12_init_vlcs(void)
669 {
670     static int done = 0;
671
672     if (!done) {
673         done = 1;
674
675         INIT_VLC_STATIC(&ff_dc_lum_vlc, DC_VLC_BITS, 12,
676                         ff_mpeg12_vlc_dc_lum_bits, 1, 1,
677                         ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
678         INIT_VLC_STATIC(&ff_dc_chroma_vlc,  DC_VLC_BITS, 12,
679                         ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
680                         ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
681         INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
682                         &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
683                         &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
684         INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
685                         &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
686                         &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
687         INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
688                         &ff_mpeg12_mbPatTable[0][1], 2, 1,
689                         &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
690
691         INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
692                         &table_mb_ptype[0][1], 2, 1,
693                         &table_mb_ptype[0][0], 2, 1, 64);
694         INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
695                         &table_mb_btype[0][1], 2, 1,
696                         &table_mb_btype[0][0], 2, 1, 64);
697         ff_init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
698         ff_init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
699
700         INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
701         INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
702     }
703 }
704
705 static inline int get_dmv(MpegEncContext *s)
706 {
707     if (get_bits1(&s->gb))
708         return 1 - (get_bits1(&s->gb) << 1);
709     else
710         return 0;
711 }
712
713 static inline int get_qscale(MpegEncContext *s)
714 {
715     int qscale = get_bits(&s->gb, 5);
716     if (s->q_scale_type) {
717         return non_linear_qscale[qscale];
718     } else {
719         return qscale << 1;
720     }
721 }
722
723 static void exchange_uv(MpegEncContext *s)
724 {
725     DCTELEM (*tmp)[64];
726
727     tmp           = s->pblocks[4];
728     s->pblocks[4] = s->pblocks[5];
729     s->pblocks[5] = tmp;
730 }
731
732 /* motion type (for MPEG-2) */
733 #define MT_FIELD 1
734 #define MT_FRAME 2
735 #define MT_16X8  2
736 #define MT_DMV   3
737
738 static int mpeg_decode_mb(MpegEncContext *s, DCTELEM block[12][64])
739 {
740     int i, j, k, cbp, val, mb_type, motion_type;
741     const int mb_block_count = 4 + (1 << s->chroma_format);
742
743     av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
744
745     av_assert2(s->mb_skipped == 0);
746
747     if (s->mb_skip_run-- != 0) {
748         if (s->pict_type == AV_PICTURE_TYPE_P) {
749             s->mb_skipped = 1;
750             s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride] = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
751         } else {
752             int mb_type;
753
754             if (s->mb_x)
755                 mb_type = s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
756             else
757                 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
758             if (IS_INTRA(mb_type))
759                 return -1;
760             s->current_picture.f.mb_type[s->mb_x + s->mb_y*s->mb_stride] =
761                 mb_type | MB_TYPE_SKIP;
762 //            av_assert2(s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1] & (MB_TYPE_16x16 | MB_TYPE_16x8));
763
764             if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
765                 s->mb_skipped = 1;
766         }
767
768         return 0;
769     }
770
771     switch (s->pict_type) {
772     default:
773     case AV_PICTURE_TYPE_I:
774         if (get_bits1(&s->gb) == 0) {
775             if (get_bits1(&s->gb) == 0) {
776                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
777                 return -1;
778             }
779             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
780         } else {
781             mb_type = MB_TYPE_INTRA;
782         }
783         break;
784     case AV_PICTURE_TYPE_P:
785         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
786         if (mb_type < 0) {
787             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
788             return -1;
789         }
790         mb_type = ptype2mb_type[mb_type];
791         break;
792     case AV_PICTURE_TYPE_B:
793         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
794         if (mb_type < 0) {
795             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
796             return -1;
797         }
798         mb_type = btype2mb_type[mb_type];
799         break;
800     }
801     av_dlog(s->avctx, "mb_type=%x\n", mb_type);
802 //    motion_type = 0; /* avoid warning */
803     if (IS_INTRA(mb_type)) {
804         s->dsp.clear_blocks(s->block[0]);
805
806         if (!s->chroma_y_shift) {
807             s->dsp.clear_blocks(s->block[6]);
808         }
809
810         /* compute DCT type */
811         if (s->picture_structure == PICT_FRAME && // FIXME add an interlaced_dct coded var?
812             !s->frame_pred_frame_dct) {
813             s->interlaced_dct = get_bits1(&s->gb);
814         }
815
816         if (IS_QUANT(mb_type))
817             s->qscale = get_qscale(s);
818
819         if (s->concealment_motion_vectors) {
820             /* just parse them */
821             if (s->picture_structure != PICT_FRAME)
822                 skip_bits1(&s->gb); /* field select */
823
824             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
825                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
826             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
827                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
828
829             skip_bits1(&s->gb); /* marker */
830         } else
831             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
832         s->mb_intra = 1;
833         // if 1, we memcpy blocks in xvmcvideo
834         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
835             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
836             if (s->swap_uv) {
837                 exchange_uv(s);
838             }
839         }
840
841         if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
842             if (s->flags2 & CODEC_FLAG2_FAST) {
843                 for (i = 0; i < 6; i++) {
844                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
845                 }
846             } else {
847                 for (i = 0; i < mb_block_count; i++) {
848                     if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
849                         return -1;
850                 }
851             }
852         } else {
853             for (i = 0; i < 6; i++) {
854                 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
855                     return -1;
856             }
857         }
858     } else {
859         if (mb_type & MB_TYPE_ZERO_MV) {
860             av_assert2(mb_type & MB_TYPE_CBP);
861
862             s->mv_dir = MV_DIR_FORWARD;
863             if (s->picture_structure == PICT_FRAME) {
864                 if (!s->frame_pred_frame_dct)
865                     s->interlaced_dct = get_bits1(&s->gb);
866                 s->mv_type = MV_TYPE_16X16;
867             } else {
868                 s->mv_type = MV_TYPE_FIELD;
869                 mb_type |= MB_TYPE_INTERLACED;
870                 s->field_select[0][0] = s->picture_structure - 1;
871             }
872
873             if (IS_QUANT(mb_type))
874                 s->qscale = get_qscale(s);
875
876             s->last_mv[0][0][0] = 0;
877             s->last_mv[0][0][1] = 0;
878             s->last_mv[0][1][0] = 0;
879             s->last_mv[0][1][1] = 0;
880             s->mv[0][0][0] = 0;
881             s->mv[0][0][1] = 0;
882         } else {
883             av_assert2(mb_type & MB_TYPE_L0L1);
884             // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
885             /* get additional motion vector type */
886             if (s->frame_pred_frame_dct)
887                 motion_type = MT_FRAME;
888             else {
889                 motion_type = get_bits(&s->gb, 2);
890                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
891                     s->interlaced_dct = get_bits1(&s->gb);
892             }
893
894             if (IS_QUANT(mb_type))
895                 s->qscale = get_qscale(s);
896
897             /* motion vectors */
898             s->mv_dir = (mb_type >> 13) & 3;
899             av_dlog(s->avctx, "motion_type=%d\n", motion_type);
900             switch (motion_type) {
901             case MT_FRAME: /* or MT_16X8 */
902                 if (s->picture_structure == PICT_FRAME) {
903                     mb_type |= MB_TYPE_16x16;
904                     s->mv_type = MV_TYPE_16X16;
905                     for (i = 0; i < 2; i++) {
906                         if (USES_LIST(mb_type, i)) {
907                             /* MT_FRAME */
908                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
909                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
910                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
911                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
912                             /* full_pel: only for MPEG-1 */
913                             if (s->full_pel[i]) {
914                                 s->mv[i][0][0] <<= 1;
915                                 s->mv[i][0][1] <<= 1;
916                             }
917                         }
918                     }
919                 } else {
920                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
921                     s->mv_type = MV_TYPE_16X8;
922                     for (i = 0; i < 2; i++) {
923                         if (USES_LIST(mb_type, i)) {
924                             /* MT_16X8 */
925                             for (j = 0; j < 2; j++) {
926                                 s->field_select[i][j] = get_bits1(&s->gb);
927                                 for (k = 0; k < 2; k++) {
928                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
929                                                              s->last_mv[i][j][k]);
930                                     s->last_mv[i][j][k] = val;
931                                     s->mv[i][j][k]      = val;
932                                 }
933                             }
934                         }
935                     }
936                 }
937                 break;
938             case MT_FIELD:
939                 s->mv_type = MV_TYPE_FIELD;
940                 if (s->picture_structure == PICT_FRAME) {
941                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
942                     for (i = 0; i < 2; i++) {
943                         if (USES_LIST(mb_type, i)) {
944                             for (j = 0; j < 2; j++) {
945                                 s->field_select[i][j] = get_bits1(&s->gb);
946                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
947                                                          s->last_mv[i][j][0]);
948                                 s->last_mv[i][j][0] = val;
949                                 s->mv[i][j][0]      = val;
950                                 av_dlog(s->avctx, "fmx=%d\n", val);
951                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
952                                                          s->last_mv[i][j][1] >> 1);
953                                 s->last_mv[i][j][1] = val << 1;
954                                 s->mv[i][j][1]      = val;
955                                 av_dlog(s->avctx, "fmy=%d\n", val);
956                             }
957                         }
958                     }
959                 } else {
960                     av_assert0(!s->progressive_sequence);
961                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
962                     for (i = 0; i < 2; i++) {
963                         if (USES_LIST(mb_type, i)) {
964                             s->field_select[i][0] = get_bits1(&s->gb);
965                             for (k = 0; k < 2; k++) {
966                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
967                                                          s->last_mv[i][0][k]);
968                                 s->last_mv[i][0][k] = val;
969                                 s->last_mv[i][1][k] = val;
970                                 s->mv[i][0][k]      = val;
971                             }
972                         }
973                     }
974                 }
975                 break;
976             case MT_DMV:
977                 if(s->progressive_sequence){
978                     av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
979                     return -1;
980                 }
981                 s->mv_type = MV_TYPE_DMV;
982                 for (i = 0; i < 2; i++) {
983                     if (USES_LIST(mb_type, i)) {
984                         int dmx, dmy, mx, my, m;
985                         const int my_shift = s->picture_structure == PICT_FRAME;
986
987                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
988                                                 s->last_mv[i][0][0]);
989                         s->last_mv[i][0][0] = mx;
990                         s->last_mv[i][1][0] = mx;
991                         dmx = get_dmv(s);
992                         my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
993                                                  s->last_mv[i][0][1] >> my_shift);
994                         dmy = get_dmv(s);
995
996
997                         s->last_mv[i][0][1] = my << my_shift;
998                         s->last_mv[i][1][1] = my << my_shift;
999
1000                         s->mv[i][0][0] = mx;
1001                         s->mv[i][0][1] = my;
1002                         s->mv[i][1][0] = mx; // not used
1003                         s->mv[i][1][1] = my; // not used
1004
1005                         if (s->picture_structure == PICT_FRAME) {
1006                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1007
1008                             // m = 1 + 2 * s->top_field_first;
1009                             m = s->top_field_first ? 1 : 3;
1010
1011                             /* top -> top pred */
1012                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1013                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1014                             m = 4 - m;
1015                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1016                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1017                         } else {
1018                             mb_type |= MB_TYPE_16x16;
1019
1020                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1021                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1022                             if (s->picture_structure == PICT_TOP_FIELD)
1023                                 s->mv[i][2][1]--;
1024                             else
1025                                 s->mv[i][2][1]++;
1026                         }
1027                     }
1028                 }
1029                 break;
1030             default:
1031                 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1032                 return -1;
1033             }
1034         }
1035
1036         s->mb_intra = 0;
1037         if (HAS_CBP(mb_type)) {
1038             s->dsp.clear_blocks(s->block[0]);
1039
1040             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1041             if (mb_block_count > 6) {
1042                  cbp <<= mb_block_count - 6;
1043                  cbp  |= get_bits(&s->gb, mb_block_count - 6);
1044                  s->dsp.clear_blocks(s->block[6]);
1045             }
1046             if (cbp <= 0) {
1047                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1048                 return -1;
1049             }
1050
1051             //if 1, we memcpy blocks in xvmcvideo
1052             if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
1053                 ff_xvmc_pack_pblocks(s, cbp);
1054                 if (s->swap_uv) {
1055                     exchange_uv(s);
1056                 }
1057             }
1058
1059             if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
1060                 if (s->flags2 & CODEC_FLAG2_FAST) {
1061                     for (i = 0; i < 6; i++) {
1062                         if (cbp & 32) {
1063                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1064                         } else {
1065                             s->block_last_index[i] = -1;
1066                         }
1067                         cbp += cbp;
1068                     }
1069                 } else {
1070                     cbp <<= 12-mb_block_count;
1071
1072                     for (i = 0; i < mb_block_count; i++) {
1073                         if (cbp & (1 << 11)) {
1074                             if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
1075                                 return -1;
1076                         } else {
1077                             s->block_last_index[i] = -1;
1078                         }
1079                         cbp += cbp;
1080                     }
1081                 }
1082             } else {
1083                 if (s->flags2 & CODEC_FLAG2_FAST) {
1084                     for (i = 0; i < 6; i++) {
1085                         if (cbp & 32) {
1086                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1087                         } else {
1088                             s->block_last_index[i] = -1;
1089                         }
1090                         cbp += cbp;
1091                     }
1092                 } else {
1093                     for (i = 0; i < 6; i++) {
1094                         if (cbp & 32) {
1095                             if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
1096                                 return -1;
1097                         } else {
1098                             s->block_last_index[i] = -1;
1099                         }
1100                         cbp += cbp;
1101                     }
1102                 }
1103             }
1104         } else {
1105             for (i = 0; i < 12; i++)
1106                 s->block_last_index[i] = -1;
1107         }
1108     }
1109
1110     s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1111
1112     return 0;
1113 }
1114
1115 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1116 {
1117     Mpeg1Context *s = avctx->priv_data;
1118     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1119     int i;
1120
1121     /* we need some permutation to store matrices,
1122      * until MPV_common_init() sets the real permutation. */
1123     for (i = 0; i < 64; i++)
1124        s2->dsp.idct_permutation[i]=i;
1125
1126     ff_MPV_decode_defaults(s2);
1127
1128     s->mpeg_enc_ctx.avctx  = avctx;
1129     s->mpeg_enc_ctx.flags  = avctx->flags;
1130     s->mpeg_enc_ctx.flags2 = avctx->flags2;
1131     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1132     ff_mpeg12_init_vlcs();
1133
1134     s->mpeg_enc_ctx_allocated      = 0;
1135     s->mpeg_enc_ctx.picture_number = 0;
1136     s->repeat_field                = 0;
1137     s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1138     avctx->color_range = AVCOL_RANGE_MPEG;
1139     if (avctx->codec->id == CODEC_ID_MPEG1VIDEO)
1140         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1141     else
1142         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1143     return 0;
1144 }
1145
1146 static int mpeg_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
1147 {
1148     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1149     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1150     int err;
1151
1152     if (avctx == avctx_from || !ctx_from->mpeg_enc_ctx_allocated || !s1->context_initialized)
1153         return 0;
1154
1155     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1156     if (err) return err;
1157
1158     if (!ctx->mpeg_enc_ctx_allocated)
1159         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1160
1161     if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1162         s->picture_number++;
1163
1164     return 0;
1165 }
1166
1167 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1168                                  const uint8_t *new_perm)
1169 {
1170     uint16_t temp_matrix[64];
1171     int i;
1172
1173     memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1174
1175     for (i = 0; i < 64; i++) {
1176         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1177     }
1178 }
1179
1180 static const enum PixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1181 #if CONFIG_MPEG_XVMC_DECODER
1182     PIX_FMT_XVMC_MPEG2_IDCT,
1183     PIX_FMT_XVMC_MPEG2_MC,
1184 #endif
1185 #if CONFIG_MPEG1_VDPAU_HWACCEL
1186     PIX_FMT_VDPAU_MPEG1,
1187 #endif
1188     PIX_FMT_YUV420P,
1189     PIX_FMT_NONE
1190 };
1191
1192 static const enum PixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1193 #if CONFIG_MPEG_XVMC_DECODER
1194     PIX_FMT_XVMC_MPEG2_IDCT,
1195     PIX_FMT_XVMC_MPEG2_MC,
1196 #endif
1197 #if CONFIG_MPEG2_VDPAU_HWACCEL
1198     PIX_FMT_VDPAU_MPEG2,
1199 #endif
1200 #if CONFIG_MPEG2_DXVA2_HWACCEL
1201     PIX_FMT_DXVA2_VLD,
1202 #endif
1203 #if CONFIG_MPEG2_VAAPI_HWACCEL
1204     PIX_FMT_VAAPI_VLD,
1205 #endif
1206     PIX_FMT_YUV420P,
1207     PIX_FMT_NONE
1208 };
1209
1210 static inline int uses_vdpau(AVCodecContext *avctx) {
1211     return avctx->pix_fmt == PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == PIX_FMT_VDPAU_MPEG2;
1212 }
1213
1214 static enum PixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1215 {
1216     Mpeg1Context *s1 = avctx->priv_data;
1217     MpegEncContext *s = &s1->mpeg_enc_ctx;
1218
1219     if(s->chroma_format < 2) {
1220         enum PixelFormat res;
1221         res = avctx->get_format(avctx,
1222                                 avctx->codec_id == CODEC_ID_MPEG1VIDEO ?
1223                                 mpeg1_hwaccel_pixfmt_list_420 :
1224                                 mpeg2_hwaccel_pixfmt_list_420);
1225         if (res != PIX_FMT_XVMC_MPEG2_IDCT && res != PIX_FMT_XVMC_MPEG2_MC) {
1226             avctx->xvmc_acceleration = 0;
1227         } else if (!avctx->xvmc_acceleration) {
1228             avctx->xvmc_acceleration = 2;
1229         }
1230         return res;
1231     } else if(s->chroma_format == 2)
1232         return PIX_FMT_YUV422P;
1233     else
1234         return PIX_FMT_YUV444P;
1235 }
1236
1237 /* Call this function when we know all parameters.
1238  * It may be called in different places for MPEG-1 and MPEG-2. */
1239 static int mpeg_decode_postinit(AVCodecContext *avctx)
1240 {
1241     Mpeg1Context *s1 = avctx->priv_data;
1242     MpegEncContext *s = &s1->mpeg_enc_ctx;
1243     uint8_t old_permutation[64];
1244
1245     if ((s1->mpeg_enc_ctx_allocated == 0) ||
1246         avctx->coded_width  != s->width   ||
1247         avctx->coded_height != s->height  ||
1248         s1->save_width           != s->width                ||
1249         s1->save_height          != s->height               ||
1250         s1->save_aspect_info     != s->aspect_ratio_info    ||
1251         s1->save_progressive_seq != s->progressive_sequence ||
1252         0)
1253     {
1254
1255         if (s1->mpeg_enc_ctx_allocated) {
1256             ParseContext pc = s->parse_context;
1257             s->parse_context.buffer = 0;
1258             ff_MPV_common_end(s);
1259             s->parse_context = pc;
1260         }
1261
1262         if ((s->width == 0) || (s->height == 0))
1263             return -2;
1264
1265         avcodec_set_dimensions(avctx, s->width, s->height);
1266         avctx->bit_rate          = s->bit_rate;
1267         s1->save_aspect_info     = s->aspect_ratio_info;
1268         s1->save_width           = s->width;
1269         s1->save_height          = s->height;
1270         s1->save_progressive_seq = s->progressive_sequence;
1271
1272         /* low_delay may be forced, in this case we will have B-frames
1273          * that behave like P-frames. */
1274         avctx->has_b_frames = !s->low_delay;
1275
1276         if (avctx->codec_id == CODEC_ID_MPEG1VIDEO) {
1277             //MPEG-1 fps
1278             avctx->time_base.den = avpriv_frame_rate_tab[s->frame_rate_index].num;
1279             avctx->time_base.num = avpriv_frame_rate_tab[s->frame_rate_index].den;
1280             //MPEG-1 aspect
1281             avctx->sample_aspect_ratio = av_d2q(1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1282             avctx->ticks_per_frame=1;
1283         } else {//MPEG-2
1284         //MPEG-2 fps
1285             av_reduce(&s->avctx->time_base.den,
1286                       &s->avctx->time_base.num,
1287                       avpriv_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1288                       avpriv_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1289                       1 << 30);
1290             avctx->ticks_per_frame = 2;
1291             //MPEG-2 aspect
1292             if (s->aspect_ratio_info > 1) {
1293                 AVRational dar =
1294                     av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1295                                       (AVRational) {s1->pan_scan.width, s1->pan_scan.height}),
1296                              (AVRational) {s->width, s->height});
1297
1298                 // we ignore the spec here and guess a bit as reality does not match the spec, see for example
1299                 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1300                 // issue1613, 621, 562
1301                 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1302                    (av_cmp_q(dar, (AVRational) {4, 3}) && av_cmp_q(dar, (AVRational) {16, 9}))) {
1303                     s->avctx->sample_aspect_ratio =
1304                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1305                                  (AVRational) {s->width, s->height});
1306                 } else {
1307                     s->avctx->sample_aspect_ratio =
1308                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1309                                  (AVRational) {s1->pan_scan.width, s1->pan_scan.height});
1310 //issue1613 4/3 16/9 -> 16/9
1311 //res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1312 //widescreen-issue562.mpg 4/3 16/9 -> 16/9
1313 //                    s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1314 //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);
1315 //av_log(NULL, AV_LOG_ERROR, "B %d/%d\n", s->avctx->sample_aspect_ratio.num, s->avctx->sample_aspect_ratio.den);
1316                 }
1317             } else {
1318                 s->avctx->sample_aspect_ratio =
1319                     ff_mpeg2_aspect[s->aspect_ratio_info];
1320             }
1321         } // MPEG-2
1322
1323         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1324         avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1325         // until then pix_fmt may be changed right after codec init
1326         if (avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
1327             avctx->hwaccel )
1328             if (avctx->idct_algo == FF_IDCT_AUTO)
1329                 avctx->idct_algo = FF_IDCT_SIMPLE;
1330
1331         /* Quantization matrices may need reordering
1332          * if DCT permutation is changed. */
1333         memcpy(old_permutation, s->dsp.idct_permutation, 64 * sizeof(uint8_t));
1334
1335         if (ff_MPV_common_init(s) < 0)
1336             return -2;
1337
1338         quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->dsp.idct_permutation);
1339         quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->dsp.idct_permutation);
1340         quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->dsp.idct_permutation);
1341         quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->dsp.idct_permutation);
1342
1343         s1->mpeg_enc_ctx_allocated = 1;
1344     }
1345     return 0;
1346 }
1347
1348 static int mpeg1_decode_picture(AVCodecContext *avctx,
1349                                 const uint8_t *buf, int buf_size)
1350 {
1351     Mpeg1Context *s1 = avctx->priv_data;
1352     MpegEncContext *s = &s1->mpeg_enc_ctx;
1353     int ref, f_code, vbv_delay;
1354
1355     init_get_bits(&s->gb, buf, buf_size*8);
1356
1357     ref = get_bits(&s->gb, 10); /* temporal ref */
1358     s->pict_type = get_bits(&s->gb, 3);
1359     if (s->pict_type == 0 || s->pict_type > 3)
1360         return -1;
1361
1362     vbv_delay = get_bits(&s->gb, 16);
1363     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
1364         s->full_pel[0] = get_bits1(&s->gb);
1365         f_code = get_bits(&s->gb, 3);
1366         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1367             return -1;
1368         f_code += !f_code;
1369         s->mpeg_f_code[0][0] = f_code;
1370         s->mpeg_f_code[0][1] = f_code;
1371     }
1372     if (s->pict_type == AV_PICTURE_TYPE_B) {
1373         s->full_pel[1] = get_bits1(&s->gb);
1374         f_code = get_bits(&s->gb, 3);
1375         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1376             return -1;
1377         f_code += !f_code;
1378         s->mpeg_f_code[1][0] = f_code;
1379         s->mpeg_f_code[1][1] = f_code;
1380     }
1381     s->current_picture.f.pict_type = s->pict_type;
1382     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1383
1384     if (avctx->debug & FF_DEBUG_PICT_INFO)
1385         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1386
1387     s->y_dc_scale = 8;
1388     s->c_dc_scale = 8;
1389     return 0;
1390 }
1391
1392 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1393 {
1394     MpegEncContext *s= &s1->mpeg_enc_ctx;
1395     int horiz_size_ext, vert_size_ext;
1396     int bit_rate_ext;
1397
1398     skip_bits(&s->gb, 1); /* profile and level esc*/
1399     s->avctx->profile       = get_bits(&s->gb, 3);
1400     s->avctx->level         = get_bits(&s->gb, 4);
1401     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1402     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1403     horiz_size_ext          = get_bits(&s->gb, 2);
1404     vert_size_ext           = get_bits(&s->gb, 2);
1405     s->width  |= (horiz_size_ext << 12);
1406     s->height |= (vert_size_ext  << 12);
1407     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1408     s->bit_rate += (bit_rate_ext << 18) * 400;
1409     skip_bits1(&s->gb); /* marker */
1410     s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1411
1412     s->low_delay = get_bits1(&s->gb);
1413     if (s->flags & CODEC_FLAG_LOW_DELAY)
1414         s->low_delay = 1;
1415
1416     s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1417     s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1418
1419     av_dlog(s->avctx, "sequence extension\n");
1420     s->codec_id      = s->avctx->codec_id = CODEC_ID_MPEG2VIDEO;
1421
1422     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1423         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1424                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1425
1426 }
1427
1428 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1429 {
1430     MpegEncContext *s = &s1->mpeg_enc_ctx;
1431     int color_description, w, h;
1432
1433     skip_bits(&s->gb, 3); /* video format */
1434     color_description = get_bits1(&s->gb);
1435     if (color_description) {
1436         s->avctx->color_primaries = get_bits(&s->gb, 8);
1437         s->avctx->color_trc       = get_bits(&s->gb, 8);
1438         s->avctx->colorspace      = get_bits(&s->gb, 8);
1439     }
1440     w = get_bits(&s->gb, 14);
1441     skip_bits(&s->gb, 1); //marker
1442     h = get_bits(&s->gb, 14);
1443     // remaining 3 bits are zero padding
1444
1445     s1->pan_scan.width  = 16 * w;
1446     s1->pan_scan.height = 16 * h;
1447
1448     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1449         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1450 }
1451
1452 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1453 {
1454     MpegEncContext *s = &s1->mpeg_enc_ctx;
1455     int i, nofco;
1456
1457     nofco = 1;
1458     if (s->progressive_sequence) {
1459         if (s->repeat_first_field) {
1460             nofco++;
1461             if (s->top_field_first)
1462                 nofco++;
1463         }
1464     } else {
1465         if (s->picture_structure == PICT_FRAME) {
1466             nofco++;
1467             if (s->repeat_first_field)
1468                 nofco++;
1469         }
1470     }
1471     for (i = 0; i < nofco; i++) {
1472         s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1473         skip_bits(&s->gb, 1); // marker
1474         s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1475         skip_bits(&s->gb, 1); // marker
1476     }
1477
1478     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1479         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1480                s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1481                s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1482                s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1483 }
1484
1485 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra)
1486 {
1487     int i;
1488
1489     for (i = 0; i < 64; i++) {
1490         int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1491         int v = get_bits(&s->gb, 8);
1492         if (v == 0) {
1493             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1494             return -1;
1495         }
1496         if (intra && i == 0 && v != 8) {
1497             av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1498             v = 8; // needed by pink.mpg / issue1046
1499         }
1500         matrix0[j] = v;
1501         if (matrix1)
1502             matrix1[j] = v;
1503     }
1504     return 0;
1505 }
1506
1507 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1508 {
1509     av_dlog(s->avctx, "matrix extension\n");
1510
1511     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1512     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1513     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL           , 1);
1514     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL           , 0);
1515 }
1516
1517 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1518 {
1519     MpegEncContext *s = &s1->mpeg_enc_ctx;
1520
1521     s->full_pel[0] = s->full_pel[1] = 0;
1522     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1523     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1524     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1525     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1526     if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1527         av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1528         if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1529             if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1530                 s->pict_type = AV_PICTURE_TYPE_I;
1531             else
1532                 s->pict_type = AV_PICTURE_TYPE_P;
1533         } else
1534             s->pict_type = AV_PICTURE_TYPE_B;
1535         s->current_picture.f.pict_type = s->pict_type;
1536         s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1537     }
1538     s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1539     s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1540     s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1541     s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1542
1543     s->intra_dc_precision         = get_bits(&s->gb, 2);
1544     s->picture_structure          = get_bits(&s->gb, 2);
1545     s->top_field_first            = get_bits1(&s->gb);
1546     s->frame_pred_frame_dct       = get_bits1(&s->gb);
1547     s->concealment_motion_vectors = get_bits1(&s->gb);
1548     s->q_scale_type               = get_bits1(&s->gb);
1549     s->intra_vlc_format           = get_bits1(&s->gb);
1550     s->alternate_scan             = get_bits1(&s->gb);
1551     s->repeat_first_field         = get_bits1(&s->gb);
1552     s->chroma_420_type            = get_bits1(&s->gb);
1553     s->progressive_frame          = get_bits1(&s->gb);
1554
1555     if (s->progressive_sequence && !s->progressive_frame) {
1556         s->progressive_frame = 1;
1557         av_log(s->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
1558     }
1559
1560     if (s->picture_structure == 0 || (s->progressive_frame && s->picture_structure != PICT_FRAME)) {
1561         av_log(s->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s->picture_structure);
1562         s->picture_structure = PICT_FRAME;
1563     }
1564
1565     if (s->progressive_sequence && !s->frame_pred_frame_dct) {
1566         av_log(s->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
1567     }
1568
1569     if (s->picture_structure == PICT_FRAME) {
1570         s->first_field = 0;
1571         s->v_edge_pos  = 16 * s->mb_height;
1572     } else {
1573         s->first_field ^= 1;
1574         s->v_edge_pos   = 8 * s->mb_height;
1575         memset(s->mbskip_table, 0, s->mb_stride * s->mb_height);
1576     }
1577
1578     if (s->alternate_scan) {
1579         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1580         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1581     } else {
1582         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1583         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1584     }
1585
1586     /* composite display not parsed */
1587     av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1588     av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1589     av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1590     av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1591     av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1592     av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1593     av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1594     av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1595     av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1596 }
1597
1598 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1599 {
1600     AVCodecContext *avctx = s->avctx;
1601     Mpeg1Context *s1 = (Mpeg1Context*)s;
1602
1603     /* start frame decoding */
1604     if (s->first_field || s->picture_structure == PICT_FRAME) {
1605         if (ff_MPV_frame_start(s, avctx) < 0)
1606             return -1;
1607
1608         ff_er_frame_start(s);
1609
1610         /* first check if we must repeat the frame */
1611         s->current_picture_ptr->f.repeat_pict = 0;
1612         if (s->repeat_first_field) {
1613             if (s->progressive_sequence) {
1614                 if (s->top_field_first)
1615                     s->current_picture_ptr->f.repeat_pict = 4;
1616                 else
1617                     s->current_picture_ptr->f.repeat_pict = 2;
1618             } else if (s->progressive_frame) {
1619                 s->current_picture_ptr->f.repeat_pict = 1;
1620             }
1621         }
1622
1623         *s->current_picture_ptr->f.pan_scan = s1->pan_scan;
1624
1625         if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1626             ff_thread_finish_setup(avctx);
1627     } else { // second field
1628         int i;
1629
1630         if (!s->current_picture_ptr) {
1631             av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1632             return -1;
1633         }
1634
1635         if (s->avctx->hwaccel &&
1636             (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1637             if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1638                 av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode first field\n");
1639         }
1640
1641         for (i = 0; i < 4; i++) {
1642             s->current_picture.f.data[i] = s->current_picture_ptr->f.data[i];
1643             if (s->picture_structure == PICT_BOTTOM_FIELD) {
1644                 s->current_picture.f.data[i] += s->current_picture_ptr->f.linesize[i];
1645             }
1646         }
1647     }
1648
1649     if (avctx->hwaccel) {
1650         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1651             return -1;
1652     }
1653
1654 // MPV_frame_start will call this function too,
1655 // but we need to call it on every field
1656     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1657         if (ff_xvmc_field_start(s, avctx) < 0)
1658             return -1;
1659
1660     return 0;
1661 }
1662
1663 #define DECODE_SLICE_ERROR -1
1664 #define DECODE_SLICE_OK     0
1665
1666 /**
1667  * Decode a slice.
1668  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1669  * @return DECODE_SLICE_ERROR if the slice is damaged,
1670  *         DECODE_SLICE_OK if this slice is OK
1671  */
1672 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1673                              const uint8_t **buf, int buf_size)
1674 {
1675     AVCodecContext *avctx = s->avctx;
1676     const int lowres      = s->avctx->lowres;
1677     const int field_pic   = s->picture_structure != PICT_FRAME;
1678
1679     s->resync_mb_x =
1680     s->resync_mb_y = -1;
1681
1682     av_assert0(mb_y < s->mb_height);
1683
1684     init_get_bits(&s->gb, *buf, buf_size * 8);
1685     if(s->codec_id != CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1686         skip_bits(&s->gb, 3);
1687
1688     ff_mpeg1_clean_buffers(s);
1689     s->interlaced_dct = 0;
1690
1691     s->qscale = get_qscale(s);
1692
1693     if (s->qscale == 0) {
1694         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1695         return -1;
1696     }
1697
1698     /* extra slice info */
1699     while (get_bits1(&s->gb) != 0) {
1700         skip_bits(&s->gb, 8);
1701     }
1702
1703     s->mb_x = 0;
1704
1705     if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1706         skip_bits1(&s->gb);
1707     } else {
1708         while (get_bits_left(&s->gb) > 0) {
1709             int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1710             if (code < 0) {
1711                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1712                 return -1;
1713             }
1714             if (code >= 33) {
1715                 if (code == 33) {
1716                     s->mb_x += 33;
1717                 }
1718                 /* otherwise, stuffing, nothing to do */
1719             } else {
1720                 s->mb_x += code;
1721                 break;
1722             }
1723         }
1724     }
1725
1726     if (s->mb_x >= (unsigned)s->mb_width) {
1727         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1728         return -1;
1729     }
1730
1731     if (avctx->hwaccel) {
1732         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1733         int start_code = -1;
1734         buf_end = avpriv_mpv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1735         if (buf_end < *buf + buf_size)
1736             buf_end -= 4;
1737         s->mb_y = mb_y;
1738         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1739             return DECODE_SLICE_ERROR;
1740         *buf = buf_end;
1741         return DECODE_SLICE_OK;
1742     }
1743
1744     s->resync_mb_x = s->mb_x;
1745     s->resync_mb_y = s->mb_y = mb_y;
1746     s->mb_skip_run = 0;
1747     ff_init_block_index(s);
1748
1749     if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1750         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1751              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",
1752                     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],
1753                     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")),
1754                     s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1755                     s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1756                     s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1757         }
1758     }
1759
1760     for (;;) {
1761         // If 1, we memcpy blocks in xvmcvideo.
1762         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1763             ff_xvmc_init_block(s); // set s->block
1764
1765         if (mpeg_decode_mb(s, s->block) < 0)
1766             return -1;
1767
1768         if (s->current_picture.f.motion_val[0] && !s->encoding) { // note motion_val is normally NULL unless we want to extract the MVs
1769             const int wrap = s->b8_stride;
1770             int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1771             int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1772             int motion_x, motion_y, dir, i;
1773
1774             for (i = 0; i < 2; i++) {
1775                 for (dir = 0; dir < 2; dir++) {
1776                     if (s->mb_intra || (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1777                         motion_x = motion_y = 0;
1778                     } else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1779                         motion_x = s->mv[dir][0][0];
1780                         motion_y = s->mv[dir][0][1];
1781                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1782                         motion_x = s->mv[dir][i][0];
1783                         motion_y = s->mv[dir][i][1];
1784                     }
1785
1786                     s->current_picture.f.motion_val[dir][xy    ][0] = motion_x;
1787                     s->current_picture.f.motion_val[dir][xy    ][1] = motion_y;
1788                     s->current_picture.f.motion_val[dir][xy + 1][0] = motion_x;
1789                     s->current_picture.f.motion_val[dir][xy + 1][1] = motion_y;
1790                     s->current_picture.f.ref_index [dir][b8_xy    ] =
1791                     s->current_picture.f.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1792                     av_assert2(s->field_select[dir][i] == 0 || s->field_select[dir][i] == 1);
1793                 }
1794                 xy += wrap;
1795                 b8_xy +=2;
1796             }
1797         }
1798
1799         s->dest[0] += 16 >> lowres;
1800         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1801         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1802
1803         ff_MPV_decode_mb(s, s->block);
1804
1805         if (++s->mb_x >= s->mb_width) {
1806             const int mb_size = 16 >> s->avctx->lowres;
1807
1808             ff_draw_horiz_band(s, mb_size*(s->mb_y >> field_pic), mb_size);
1809             ff_MPV_report_decode_progress(s);
1810
1811             s->mb_x = 0;
1812             s->mb_y += 1 << field_pic;
1813
1814             if (s->mb_y >= s->mb_height) {
1815                 int left   = get_bits_left(&s->gb);
1816                 int is_d10 = s->chroma_format == 2 && s->pict_type == AV_PICTURE_TYPE_I && avctx->profile == 0 && avctx->level == 5
1817                              && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1818                              && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1819
1820                 if (left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1821                     || ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1822                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1823                     return -1;
1824                 } else
1825                     goto eos;
1826             }
1827
1828             ff_init_block_index(s);
1829         }
1830
1831         /* skip mb handling */
1832         if (s->mb_skip_run == -1) {
1833             /* read increment again */
1834             s->mb_skip_run = 0;
1835             for (;;) {
1836                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1837                 if (code < 0) {
1838                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1839                     return -1;
1840                 }
1841                 if (code >= 33) {
1842                     if (code == 33) {
1843                         s->mb_skip_run += 33;
1844                     } else if (code == 35) {
1845                         if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1846                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1847                             return -1;
1848                         }
1849                         goto eos; /* end of slice */
1850                     }
1851                     /* otherwise, stuffing, nothing to do */
1852                 } else {
1853                     s->mb_skip_run += code;
1854                     break;
1855                 }
1856             }
1857             if (s->mb_skip_run) {
1858                 int i;
1859                 if (s->pict_type == AV_PICTURE_TYPE_I) {
1860                     av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1861                     return -1;
1862                 }
1863
1864                 /* skip mb */
1865                 s->mb_intra = 0;
1866                 for (i = 0; i < 12; i++)
1867                     s->block_last_index[i] = -1;
1868                 if (s->picture_structure == PICT_FRAME)
1869                     s->mv_type = MV_TYPE_16X16;
1870                 else
1871                     s->mv_type = MV_TYPE_FIELD;
1872                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1873                     /* if P type, zero motion vector is implied */
1874                     s->mv_dir             = MV_DIR_FORWARD;
1875                     s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1876                     s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1877                     s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1878                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1879                 } else {
1880                     /* if B type, reuse previous vectors and directions */
1881                     s->mv[0][0][0] = s->last_mv[0][0][0];
1882                     s->mv[0][0][1] = s->last_mv[0][0][1];
1883                     s->mv[1][0][0] = s->last_mv[1][0][0];
1884                     s->mv[1][0][1] = s->last_mv[1][0][1];
1885                 }
1886             }
1887         }
1888     }
1889 eos: // end of slice
1890     *buf += (get_bits_count(&s->gb)-1)/8;
1891 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1892     return 0;
1893 }
1894
1895 static int slice_decode_thread(AVCodecContext *c, void *arg)
1896 {
1897     MpegEncContext *s   = *(void**)arg;
1898     const uint8_t *buf  = s->gb.buffer;
1899     int mb_y            = s->start_mb_y;
1900     const int field_pic = s->picture_structure != PICT_FRAME;
1901
1902     s->error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1903
1904     for (;;) {
1905         uint32_t start_code;
1906         int ret;
1907
1908         ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1909         emms_c();
1910 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1911 //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);
1912         if (ret < 0) {
1913             if (c->err_recognition & AV_EF_EXPLODE)
1914                 return ret;
1915             if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1916                 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);
1917         } else {
1918             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);
1919         }
1920
1921         if (s->mb_y == s->end_mb_y)
1922             return 0;
1923
1924         start_code = -1;
1925         buf = avpriv_mpv_find_start_code(buf, s->gb.buffer_end, &start_code);
1926         mb_y= start_code - SLICE_MIN_START_CODE;
1927         if(s->codec_id != CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1928             mb_y += (*buf&0xE0)<<2;
1929         mb_y <<= field_pic;
1930         if (s->picture_structure == PICT_BOTTOM_FIELD)
1931             mb_y++;
1932         if (mb_y < 0 || mb_y >= s->end_mb_y)
1933             return -1;
1934     }
1935 }
1936
1937 /**
1938  * Handle slice ends.
1939  * @return 1 if it seems to be the last slice
1940  */
1941 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1942 {
1943     Mpeg1Context *s1 = avctx->priv_data;
1944     MpegEncContext *s = &s1->mpeg_enc_ctx;
1945
1946     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1947         return 0;
1948
1949     if (s->avctx->hwaccel) {
1950         if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1951             av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1952     }
1953
1954     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1955         ff_xvmc_field_end(s);
1956
1957     /* end of slice reached */
1958     if (/*s->mb_y << field_pic == s->mb_height &&*/ !s->first_field && !s->first_slice) {
1959         /* end of image */
1960
1961         s->current_picture_ptr->f.qscale_type = FF_QSCALE_TYPE_MPEG2;
1962
1963         ff_er_frame_end(s);
1964
1965         ff_MPV_frame_end(s);
1966
1967         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
1968             *pict = s->current_picture_ptr->f;
1969             ff_print_debug_info(s, pict);
1970         } else {
1971             if (avctx->active_thread_type & FF_THREAD_FRAME)
1972                 s->picture_number++;
1973             /* latency of 1 frame for I- and P-frames */
1974             /* XXX: use another variable than picture_number */
1975             if (s->last_picture_ptr != NULL) {
1976                 *pict = s->last_picture_ptr->f;
1977                  ff_print_debug_info(s, pict);
1978             }
1979         }
1980
1981         return 1;
1982     } else {
1983         return 0;
1984     }
1985 }
1986
1987 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1988                                  const uint8_t *buf, int buf_size)
1989 {
1990     Mpeg1Context *s1 = avctx->priv_data;
1991     MpegEncContext *s = &s1->mpeg_enc_ctx;
1992     int width, height;
1993     int i, v, j;
1994
1995     init_get_bits(&s->gb, buf, buf_size*8);
1996
1997     width  = get_bits(&s->gb, 12);
1998     height = get_bits(&s->gb, 12);
1999     if (width <= 0 || height <= 0)
2000         return -1;
2001     s->aspect_ratio_info = get_bits(&s->gb, 4);
2002     if (s->aspect_ratio_info == 0) {
2003         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2004         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2005             return -1;
2006     }
2007     s->frame_rate_index = get_bits(&s->gb, 4);
2008     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2009         return -1;
2010     s->bit_rate = get_bits(&s->gb, 18) * 400;
2011     if (get_bits1(&s->gb) == 0) /* marker */
2012         return -1;
2013     s->width  = width;
2014     s->height = height;
2015
2016     s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2017     skip_bits(&s->gb, 1);
2018
2019     /* get matrix */
2020     if (get_bits1(&s->gb)) {
2021         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2022     } else {
2023         for (i = 0; i < 64; i++) {
2024             j = s->dsp.idct_permutation[i];
2025             v = ff_mpeg1_default_intra_matrix[i];
2026             s->intra_matrix[j]        = v;
2027             s->chroma_intra_matrix[j] = v;
2028         }
2029     }
2030     if (get_bits1(&s->gb)) {
2031         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2032     } else {
2033         for (i = 0; i < 64; i++) {
2034             int j = s->dsp.idct_permutation[i];
2035             v = ff_mpeg1_default_non_intra_matrix[i];
2036             s->inter_matrix[j]        = v;
2037             s->chroma_inter_matrix[j] = v;
2038         }
2039     }
2040
2041     if (show_bits(&s->gb, 23) != 0) {
2042         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2043         return -1;
2044     }
2045
2046     /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2047     s->progressive_sequence = 1;
2048     s->progressive_frame    = 1;
2049     s->picture_structure    = PICT_FRAME;
2050     s->first_field          = 0;
2051     s->frame_pred_frame_dct = 1;
2052     s->chroma_format        = 1;
2053     s->codec_id             = s->avctx->codec_id = CODEC_ID_MPEG1VIDEO;
2054     s->out_format           = FMT_MPEG1;
2055     s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2056     if (s->flags & CODEC_FLAG_LOW_DELAY)
2057         s->low_delay = 1;
2058
2059     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2060         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2061                s->avctx->rc_buffer_size, s->bit_rate);
2062
2063     return 0;
2064 }
2065
2066 static int vcr2_init_sequence(AVCodecContext *avctx)
2067 {
2068     Mpeg1Context *s1 = avctx->priv_data;
2069     MpegEncContext *s = &s1->mpeg_enc_ctx;
2070     int i, v;
2071
2072     /* start new MPEG-1 context decoding */
2073     s->out_format = FMT_MPEG1;
2074     if (s1->mpeg_enc_ctx_allocated) {
2075         ff_MPV_common_end(s);
2076     }
2077     s->width  = avctx->coded_width;
2078     s->height = avctx->coded_height;
2079     avctx->has_b_frames = 0; // true?
2080     s->low_delay = 1;
2081
2082     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2083     avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2084
2085     if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel )
2086         if (avctx->idct_algo == FF_IDCT_AUTO)
2087             avctx->idct_algo = FF_IDCT_SIMPLE;
2088
2089     if (ff_MPV_common_init(s) < 0)
2090         return -1;
2091     s1->mpeg_enc_ctx_allocated = 1;
2092
2093     for (i = 0; i < 64; i++) {
2094         int j = s->dsp.idct_permutation[i];
2095         v = ff_mpeg1_default_intra_matrix[i];
2096         s->intra_matrix[j]        = v;
2097         s->chroma_intra_matrix[j] = v;
2098
2099         v = ff_mpeg1_default_non_intra_matrix[i];
2100         s->inter_matrix[j]        = v;
2101         s->chroma_inter_matrix[j] = v;
2102     }
2103
2104     s->progressive_sequence  = 1;
2105     s->progressive_frame     = 1;
2106     s->picture_structure     = PICT_FRAME;
2107     s->first_field           = 0;
2108     s->frame_pred_frame_dct  = 1;
2109     s->chroma_format         = 1;
2110     if (s->codec_tag == AV_RL32("BW10")) {
2111         s->codec_id              = s->avctx->codec_id = CODEC_ID_MPEG1VIDEO;
2112     } else {
2113         exchange_uv(s); // common init reset pblocks, so we swap them here
2114         s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2115         s->codec_id              = s->avctx->codec_id = CODEC_ID_MPEG2VIDEO;
2116     }
2117     s1->save_width           = s->width;
2118     s1->save_height          = s->height;
2119     s1->save_progressive_seq = s->progressive_sequence;
2120     return 0;
2121 }
2122
2123
2124 static void mpeg_decode_user_data(AVCodecContext *avctx,
2125                                   const uint8_t *p, int buf_size)
2126 {
2127     Mpeg1Context *s = avctx->priv_data;
2128     const uint8_t *buf_end = p + buf_size;
2129
2130     if(buf_size > 29){
2131         int i;
2132         for(i=0; i<20; i++)
2133             if(!memcmp(p+i, "\0TMPGEXS\0", 9)){
2134                 s->tmpgexs= 1;
2135             }
2136
2137 /*        for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2138             av_log(0,0, "%c", p[i]);
2139         }
2140             av_log(0,0, "\n");*/
2141     }
2142
2143     /* we parse the DTG active format information */
2144     if (buf_end - p >= 5 &&
2145         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2146         int flags = p[4];
2147         p += 5;
2148         if (flags & 0x80) {
2149             /* skip event id */
2150             p += 2;
2151         }
2152         if (flags & 0x40) {
2153             if (buf_end - p < 1)
2154                 return;
2155             avctx->dtg_active_format = p[0] & 0x0f;
2156         }
2157     }
2158 }
2159
2160 static void mpeg_decode_gop(AVCodecContext *avctx,
2161                             const uint8_t *buf, int buf_size)
2162 {
2163     Mpeg1Context *s1  = avctx->priv_data;
2164     MpegEncContext *s = &s1->mpeg_enc_ctx;
2165     int broken_link;
2166     int64_t tc;
2167
2168     init_get_bits(&s->gb, buf, buf_size*8);
2169
2170     tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2171
2172     s->closed_gop = get_bits1(&s->gb);
2173     /*broken_link indicate that after editing the
2174       reference frames of the first B-Frames after GOP I-Frame
2175       are missing (open gop)*/
2176     broken_link = get_bits1(&s->gb);
2177
2178     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2179         char tcbuf[AV_TIMECODE_STR_SIZE];
2180         av_timecode_make_mpeg_tc_string(tcbuf, tc);
2181         av_log(s->avctx, AV_LOG_DEBUG,
2182                "GOP (%s) closed_gop=%d broken_link=%d\n",
2183                tcbuf, s->closed_gop, broken_link);
2184     }
2185 }
2186 /**
2187  * Find the end of the current frame in the bitstream.
2188  * @return the position of the first byte of the next frame, or -1
2189  */
2190 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2191 {
2192     int i;
2193     uint32_t state = pc->state;
2194
2195     /* EOF considered as end of frame */
2196     if (buf_size == 0)
2197         return 0;
2198
2199 /*
2200  0  frame start         -> 1/4
2201  1  first_SEQEXT        -> 0/2
2202  2  first field start   -> 3/0
2203  3  second_SEQEXT       -> 2/0
2204  4  searching end
2205 */
2206
2207     for (i = 0; i < buf_size; i++) {
2208         av_assert1(pc->frame_start_found >= 0 && pc->frame_start_found <= 4);
2209         if (pc->frame_start_found & 1) {
2210             if (state == EXT_START_CODE && (buf[i] & 0xF0) != 0x80)
2211                 pc->frame_start_found--;
2212             else if (state == EXT_START_CODE + 2) {
2213                 if ((buf[i] & 3) == 3)
2214                     pc->frame_start_found = 0;
2215                 else
2216                     pc->frame_start_found = (pc->frame_start_found + 1) & 3;
2217             }
2218             state++;
2219         } else {
2220             i = avpriv_mpv_find_start_code(buf + i, buf + buf_size, &state) - buf - 1;
2221             if (pc->frame_start_found == 0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE) {
2222                 i++;
2223                 pc->frame_start_found = 4;
2224             }
2225             if (state == SEQ_END_CODE) {
2226                 pc->frame_start_found = 0;
2227                 pc->state=-1;
2228                 return i+1;
2229             }
2230             if (pc->frame_start_found == 2 && state == SEQ_START_CODE)
2231                 pc->frame_start_found = 0;
2232             if (pc->frame_start_found  < 4 && state == EXT_START_CODE)
2233                 pc->frame_start_found++;
2234             if (pc->frame_start_found == 4 && (state & 0xFFFFFF00) == 0x100) {
2235                 if (state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE) {
2236                     pc->frame_start_found = 0;
2237                     pc->state             = -1;
2238                     return i - 3;
2239                 }
2240             }
2241             if (pc->frame_start_found == 0 && s && state == PICTURE_START_CODE) {
2242                 ff_fetch_timestamp(s, i - 3, 1);
2243             }
2244         }
2245     }
2246     pc->state = state;
2247     return END_NOT_FOUND;
2248 }
2249
2250 static int decode_chunks(AVCodecContext *avctx,
2251                          AVFrame *picture, int *data_size,
2252                          const uint8_t *buf, int buf_size);
2253
2254 /* handle buffering and image synchronisation */
2255 static int mpeg_decode_frame(AVCodecContext *avctx,
2256                              void *data, int *data_size,
2257                              AVPacket *avpkt)
2258 {
2259     const uint8_t *buf = avpkt->data;
2260     int buf_size = avpkt->size;
2261     Mpeg1Context *s = avctx->priv_data;
2262     AVFrame *picture = data;
2263     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2264     av_dlog(avctx, "fill_buffer\n");
2265
2266     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2267         /* special case for last picture */
2268         if (s2->low_delay == 0 && s2->next_picture_ptr) {
2269             *picture = s2->next_picture_ptr->f;
2270             s2->next_picture_ptr = NULL;
2271
2272             *data_size = sizeof(AVFrame);
2273         }
2274         return buf_size;
2275     }
2276
2277     if (s2->flags & CODEC_FLAG_TRUNCATED) {
2278         int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2279
2280         if (ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0)
2281             return buf_size;
2282     }
2283
2284     s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2285     if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2286                                            || s2->codec_tag == AV_RL32("BW10")
2287                                           ))
2288         vcr2_init_sequence(avctx);
2289
2290     s->slice_count = 0;
2291
2292     if (avctx->extradata && !s->parsed_extra) {
2293         int ret = decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2294         if(*data_size) {
2295             av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2296             *data_size = 0;
2297         }
2298         s->parsed_extra = 1;
2299         if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
2300             return ret;
2301     }
2302
2303     return decode_chunks(avctx, picture, data_size, buf, buf_size);
2304 }
2305
2306 static int decode_chunks(AVCodecContext *avctx,
2307                          AVFrame *picture, int *data_size,
2308                          const uint8_t *buf, int buf_size)
2309 {
2310     Mpeg1Context *s = avctx->priv_data;
2311     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2312     const uint8_t *buf_ptr = buf;
2313     const uint8_t *buf_end = buf + buf_size;
2314     int ret, input_size;
2315     int last_code = 0;
2316
2317     for (;;) {
2318         /* find next start code */
2319         uint32_t start_code = -1;
2320         buf_ptr = avpriv_mpv_find_start_code(buf_ptr, buf_end, &start_code);
2321         if (start_code > 0x1ff) {
2322             if (s2->pict_type != AV_PICTURE_TYPE_B || avctx->skip_frame <= AVDISCARD_DEFAULT) {
2323                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2324                     int i;
2325                     av_assert0(avctx->thread_count > 1);
2326
2327                     avctx->execute(avctx, slice_decode_thread,  &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
2328                     for (i = 0; i < s->slice_count; i++)
2329                         s2->error_count += s2->thread_context[i]->error_count;
2330                 }
2331
2332                 if (CONFIG_VDPAU && uses_vdpau(avctx))
2333                     ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2334
2335
2336                 if (slice_end(avctx, picture)) {
2337                     if (s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2338                         *data_size = sizeof(AVPicture);
2339                 }
2340             }
2341             s2->pict_type = 0;
2342             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2343         }
2344
2345         input_size = buf_end - buf_ptr;
2346
2347         if (avctx->debug & FF_DEBUG_STARTCODE) {
2348             av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2349         }
2350
2351         /* prepare data for next start code */
2352         switch (start_code) {
2353         case SEQ_START_CODE:
2354             if (last_code == 0) {
2355                 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2356                 if(buf != avctx->extradata)
2357                     s->sync=1;
2358             } else {
2359                 av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2360                 if (avctx->err_recognition & AV_EF_EXPLODE)
2361                     return AVERROR_INVALIDDATA;
2362             }
2363             break;
2364
2365         case PICTURE_START_CODE:
2366             if(s->tmpgexs){
2367                 s2->intra_dc_precision= 3;
2368                 s2->intra_matrix[0]= 1;
2369             }
2370             if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) && s->slice_count) {
2371                 int i;
2372
2373                 avctx->execute(avctx, slice_decode_thread,
2374                                s2->thread_context, NULL,
2375                                s->slice_count, sizeof(void*));
2376                 for (i = 0; i < s->slice_count; i++)
2377                     s2->error_count += s2->thread_context[i]->error_count;
2378                 s->slice_count = 0;
2379             }
2380             if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2381                 ret = mpeg_decode_postinit(avctx);
2382                 if (ret < 0) {
2383                     av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
2384                     return ret;
2385                 }
2386
2387                 /* we have a complete image: we try to decompress it */
2388                 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2389                     s2->pict_type = 0;
2390                 s2->first_slice = 1;
2391                 last_code = PICTURE_START_CODE;
2392             } else {
2393                 av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
2394                 if (avctx->err_recognition & AV_EF_EXPLODE)
2395                     return AVERROR_INVALIDDATA;
2396             }
2397             break;
2398         case EXT_START_CODE:
2399             init_get_bits(&s2->gb, buf_ptr, input_size*8);
2400
2401             switch (get_bits(&s2->gb, 4)) {
2402             case 0x1:
2403                 if (last_code == 0) {
2404                 mpeg_decode_sequence_extension(s);
2405                 } else {
2406                     av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
2407                     if (avctx->err_recognition & AV_EF_EXPLODE)
2408                         return AVERROR_INVALIDDATA;
2409                 }
2410                 break;
2411             case 0x2:
2412                 mpeg_decode_sequence_display_extension(s);
2413                 break;
2414             case 0x3:
2415                 mpeg_decode_quant_matrix_extension(s2);
2416                 break;
2417             case 0x7:
2418                 mpeg_decode_picture_display_extension(s);
2419                 break;
2420             case 0x8:
2421                 if (last_code == PICTURE_START_CODE) {
2422                     mpeg_decode_picture_coding_extension(s);
2423                 } else {
2424                     av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
2425                     if (avctx->err_recognition & AV_EF_EXPLODE)
2426                         return AVERROR_INVALIDDATA;
2427                 }
2428                 break;
2429             }
2430             break;
2431         case USER_START_CODE:
2432             mpeg_decode_user_data(avctx, buf_ptr, input_size);
2433             break;
2434         case GOP_START_CODE:
2435             if (last_code == 0) {
2436                 s2->first_field=0;
2437                 mpeg_decode_gop(avctx, buf_ptr, input_size);
2438                 s->sync=1;
2439             } else {
2440                 av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
2441                 if (avctx->err_recognition & AV_EF_EXPLODE)
2442                     return AVERROR_INVALIDDATA;
2443             }
2444             break;
2445         default:
2446             if (start_code >= SLICE_MIN_START_CODE &&
2447                 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2448                 const int field_pic = s2->picture_structure != PICT_FRAME;
2449                 int mb_y = start_code - SLICE_MIN_START_CODE;
2450                 last_code = SLICE_MIN_START_CODE;
2451                 if(s2->codec_id != CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2452                     mb_y += (*buf_ptr&0xE0)<<2;
2453
2454                 mb_y <<= field_pic;
2455                 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2456                     mb_y++;
2457
2458                 if (mb_y >= s2->mb_height) {
2459                     av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2460                     return -1;
2461                 }
2462
2463                 if (s2->last_picture_ptr == NULL) {
2464                 /* Skip B-frames if we do not have reference frames and gop is not closed */
2465                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
2466                         if (!s2->closed_gop)
2467                             break;
2468                     }
2469                 }
2470                 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
2471                     s->sync=1;
2472                 if (s2->next_picture_ptr == NULL) {
2473                 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2474                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) break;
2475                 }
2476                 if ((avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type == AV_PICTURE_TYPE_B) ||
2477                     (avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type != AV_PICTURE_TYPE_I) ||
2478                      avctx->skip_frame >= AVDISCARD_ALL)
2479                     break;
2480
2481                 if (!s->mpeg_enc_ctx_allocated)
2482                     break;
2483
2484                 if (s2->codec_id == CODEC_ID_MPEG2VIDEO) {
2485                     if (mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2486                         break;
2487                 }
2488
2489                 if (!s2->pict_type) {
2490                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2491                     if (avctx->err_recognition & AV_EF_EXPLODE)
2492                         return AVERROR_INVALIDDATA;
2493                     break;
2494                 }
2495
2496                 if (s2->first_slice) {
2497                     s2->first_slice = 0;
2498                     if (mpeg_field_start(s2, buf, buf_size) < 0)
2499                         return -1;
2500                 }
2501                 if (!s2->current_picture_ptr) {
2502                     av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2503                     return AVERROR_INVALIDDATA;
2504                 }
2505
2506                 if (uses_vdpau(avctx)) {
2507                     s->slice_count++;
2508                     break;
2509                 }
2510
2511                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2512                     int threshold = (s2->mb_height * s->slice_count +
2513                                      s2->slice_context_count / 2) /
2514                                     s2->slice_context_count;
2515                     av_assert0(avctx->thread_count > 1);
2516                     if (threshold <= mb_y) {
2517                         MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2518
2519                         thread_context->start_mb_y = mb_y;
2520                         thread_context->end_mb_y   = s2->mb_height;
2521                         if (s->slice_count) {
2522                             s2->thread_context[s->slice_count-1]->end_mb_y = mb_y;
2523                             ff_update_duplicate_context(thread_context, s2);
2524                         }
2525                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2526                         s->slice_count++;
2527                     }
2528                     buf_ptr += 2; // FIXME add minimum number of bytes per slice
2529                 } else {
2530                     ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2531                     emms_c();
2532
2533                     if (ret < 0) {
2534                         if (avctx->err_recognition & AV_EF_EXPLODE)
2535                             return ret;
2536                         if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2537                             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);
2538                     } else {
2539                         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);
2540                     }
2541                 }
2542             }
2543             break;
2544         }
2545     }
2546 }
2547
2548 static void flush(AVCodecContext *avctx)
2549 {
2550     Mpeg1Context *s = avctx->priv_data;
2551
2552     s->sync=0;
2553
2554     ff_mpeg_flush(avctx);
2555 }
2556
2557 static int mpeg_decode_end(AVCodecContext *avctx)
2558 {
2559     Mpeg1Context *s = avctx->priv_data;
2560
2561     if (s->mpeg_enc_ctx_allocated)
2562         ff_MPV_common_end(&s->mpeg_enc_ctx);
2563     return 0;
2564 }
2565
2566 static const AVProfile mpeg2_video_profiles[] = {
2567     { FF_PROFILE_MPEG2_422,          "4:2:2"              },
2568     { FF_PROFILE_MPEG2_HIGH,         "High"               },
2569     { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
2570     { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
2571     { FF_PROFILE_MPEG2_MAIN,         "Main"               },
2572     { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
2573     { FF_PROFILE_RESERVED,           "Reserved"           },
2574     { FF_PROFILE_RESERVED,           "Reserved"           },
2575     { FF_PROFILE_UNKNOWN },
2576 };
2577
2578
2579 AVCodec ff_mpeg1video_decoder = {
2580     .name                  = "mpeg1video",
2581     .type                  = AVMEDIA_TYPE_VIDEO,
2582     .id                    = CODEC_ID_MPEG1VIDEO,
2583     .priv_data_size        = sizeof(Mpeg1Context),
2584     .init                  = mpeg_decode_init,
2585     .close                 = mpeg_decode_end,
2586     .decode                = mpeg_decode_frame,
2587     .capabilities          = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2588                              CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2589                              CODEC_CAP_SLICE_THREADS,
2590     .flush                 = flush,
2591     .max_lowres            = 3,
2592     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2593     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2594 };
2595
2596 AVCodec ff_mpeg2video_decoder = {
2597     .name           = "mpeg2video",
2598     .type           = AVMEDIA_TYPE_VIDEO,
2599     .id             = CODEC_ID_MPEG2VIDEO,
2600     .priv_data_size = sizeof(Mpeg1Context),
2601     .init           = mpeg_decode_init,
2602     .close          = mpeg_decode_end,
2603     .decode         = mpeg_decode_frame,
2604     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2605                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2606                       CODEC_CAP_SLICE_THREADS,
2607     .flush          = flush,
2608     .max_lowres     = 3,
2609     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2610     .profiles       = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2611 };
2612
2613 //legacy decoder
2614 AVCodec ff_mpegvideo_decoder = {
2615     .name           = "mpegvideo",
2616     .type           = AVMEDIA_TYPE_VIDEO,
2617     .id             = CODEC_ID_MPEG2VIDEO,
2618     .priv_data_size = sizeof(Mpeg1Context),
2619     .init           = mpeg_decode_init,
2620     .close          = mpeg_decode_end,
2621     .decode         = mpeg_decode_frame,
2622     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2623     .flush          = flush,
2624     .max_lowres     = 3,
2625     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2626 };
2627
2628 #if CONFIG_MPEG_XVMC_DECODER
2629 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2630 {
2631     if (avctx->active_thread_type & FF_THREAD_SLICE)
2632         return -1;
2633     if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2634         return -1;
2635     if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2636         av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2637     }
2638     mpeg_decode_init(avctx);
2639
2640     avctx->pix_fmt           = PIX_FMT_XVMC_MPEG2_IDCT;
2641     avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2642
2643     return 0;
2644 }
2645
2646 AVCodec ff_mpeg_xvmc_decoder = {
2647     .name           = "mpegvideo_xvmc",
2648     .type           = AVMEDIA_TYPE_VIDEO,
2649     .id             = CODEC_ID_MPEG2VIDEO_XVMC,
2650     .priv_data_size = sizeof(Mpeg1Context),
2651     .init           = mpeg_mc_decode_init,
2652     .close          = mpeg_decode_end,
2653     .decode         = mpeg_decode_frame,
2654     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2655                       CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2656     .flush          = flush,
2657     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2658 };
2659
2660 #endif
2661
2662 #if CONFIG_MPEG_VDPAU_DECODER
2663 AVCodec ff_mpeg_vdpau_decoder = {
2664     .name           = "mpegvideo_vdpau",
2665     .type           = AVMEDIA_TYPE_VIDEO,
2666     .id             = CODEC_ID_MPEG2VIDEO,
2667     .priv_data_size = sizeof(Mpeg1Context),
2668     .init           = mpeg_decode_init,
2669     .close          = mpeg_decode_end,
2670     .decode         = mpeg_decode_frame,
2671     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2672                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2673     .flush          = flush,
2674     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2675 };
2676 #endif
2677
2678 #if CONFIG_MPEG1_VDPAU_DECODER
2679 AVCodec ff_mpeg1_vdpau_decoder = {
2680     .name           = "mpeg1video_vdpau",
2681     .type           = AVMEDIA_TYPE_VIDEO,
2682     .id             = CODEC_ID_MPEG1VIDEO,
2683     .priv_data_size = sizeof(Mpeg1Context),
2684     .init           = mpeg_decode_init,
2685     .close          = mpeg_decode_end,
2686     .decode         = mpeg_decode_frame,
2687     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2688                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2689     .flush          = flush,
2690     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2691 };
2692 #endif