0e1536f7ab261cf9375c9ef4661f677cc17f7ab9
[ffmpeg.git] / libavcodec / mpeg12.c
1 /*
2  * MPEG-1/2 decoder
3  * Copyright (c) 2000,2001 Fabrice Bellard
4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of Libav.
7  *
8  * Libav is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * Libav is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22
23 /**
24  * @file
25  * MPEG-1/2 decoder
26  */
27
28 //#define DEBUG
29 #include "internal.h"
30 #include "avcodec.h"
31 #include "dsputil.h"
32 #include "mpegvideo.h"
33
34 #include "mpeg12.h"
35 #include "mpeg12data.h"
36 #include "mpeg12decdata.h"
37 #include "bytestream.h"
38 #include "vdpau_internal.h"
39 #include "xvmc_internal.h"
40 #include "thread.h"
41
42 //#undef NDEBUG
43 //#include <assert.h>
44
45
46 #define MV_VLC_BITS 9
47 #define MBINCR_VLC_BITS 9
48 #define MB_PAT_VLC_BITS 9
49 #define MB_PTYPE_VLC_BITS 6
50 #define MB_BTYPE_VLC_BITS 6
51
52 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
53                               DCTELEM *block,
54                               int n);
55 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
56                               DCTELEM *block,
57                               int n);
58 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
59 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
60                                         DCTELEM *block,
61                                         int n);
62 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
63                                     DCTELEM *block,
64                                     int n);
65 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
66 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
67 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
68 static void exchange_uv(MpegEncContext *s);
69
70 static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
71                                            PIX_FMT_XVMC_MPEG2_IDCT,
72                                            PIX_FMT_XVMC_MPEG2_MC,
73                                            PIX_FMT_NONE};
74
75 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
76
77
78 #define INIT_2D_VLC_RL(rl, static_size)\
79 {\
80     static RL_VLC_ELEM rl_vlc_table[static_size];\
81     INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
82              &rl.table_vlc[0][1], 4, 2,\
83              &rl.table_vlc[0][0], 4, 2, static_size);\
84 \
85     rl.rl_vlc[0]= rl_vlc_table;\
86     init_2d_vlc_rl(&rl);\
87 }
88
89 static void init_2d_vlc_rl(RLTable *rl)
90 {
91     int i;
92
93     for(i=0; i<rl->vlc.table_size; i++){
94         int code= rl->vlc.table[i][0];
95         int len = rl->vlc.table[i][1];
96         int level, run;
97
98         if(len==0){ // illegal code
99             run= 65;
100             level= MAX_LEVEL;
101         }else if(len<0){ //more bits needed
102             run= 0;
103             level= code;
104         }else{
105             if(code==rl->n){ //esc
106                 run= 65;
107                 level= 0;
108             }else if(code==rl->n+1){ //eob
109                 run= 0;
110                 level= 127;
111             }else{
112                 run=   rl->table_run  [code] + 1;
113                 level= rl->table_level[code];
114             }
115         }
116         rl->rl_vlc[0][i].len= len;
117         rl->rl_vlc[0][i].level= level;
118         rl->rl_vlc[0][i].run= run;
119     }
120 }
121
122 void ff_mpeg12_common_init(MpegEncContext *s)
123 {
124
125     s->y_dc_scale_table=
126     s->c_dc_scale_table= ff_mpeg2_dc_scale_table[s->intra_dc_precision];
127
128 }
129
130 void ff_mpeg1_clean_buffers(MpegEncContext *s){
131     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
132     s->last_dc[1] = s->last_dc[0];
133     s->last_dc[2] = s->last_dc[0];
134     memset(s->last_mv, 0, sizeof(s->last_mv));
135 }
136
137
138 /******************************************/
139 /* decoding */
140
141 VLC ff_dc_lum_vlc;
142 VLC ff_dc_chroma_vlc;
143
144 static VLC mv_vlc;
145 static VLC mbincr_vlc;
146 static VLC mb_ptype_vlc;
147 static VLC mb_btype_vlc;
148 static VLC mb_pat_vlc;
149
150 av_cold void ff_mpeg12_init_vlcs(void)
151 {
152     static int done = 0;
153
154     if (!done) {
155         done = 1;
156
157         INIT_VLC_STATIC(&ff_dc_lum_vlc, DC_VLC_BITS, 12,
158                  ff_mpeg12_vlc_dc_lum_bits, 1, 1,
159                  ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
160         INIT_VLC_STATIC(&ff_dc_chroma_vlc,  DC_VLC_BITS, 12,
161                  ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
162                  ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
163         INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
164                  &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
165                  &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
166         INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
167                  &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
168                  &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
169         INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
170                  &ff_mpeg12_mbPatTable[0][1], 2, 1,
171                  &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
172
173         INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
174                  &table_mb_ptype[0][1], 2, 1,
175                  &table_mb_ptype[0][0], 2, 1, 64);
176         INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
177                  &table_mb_btype[0][1], 2, 1,
178                  &table_mb_btype[0][0], 2, 1, 64);
179         init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
180         init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
181
182         INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
183         INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
184     }
185 }
186
187 static inline int get_dmv(MpegEncContext *s)
188 {
189     if(get_bits1(&s->gb))
190         return 1 - (get_bits1(&s->gb) << 1);
191     else
192         return 0;
193 }
194
195 static inline int get_qscale(MpegEncContext *s)
196 {
197     int qscale = get_bits(&s->gb, 5);
198     if (s->q_scale_type) {
199         return non_linear_qscale[qscale];
200     } else {
201         return qscale << 1;
202     }
203 }
204
205 /* motion type (for MPEG-2) */
206 #define MT_FIELD 1
207 #define MT_FRAME 2
208 #define MT_16X8  2
209 #define MT_DMV   3
210
211 static int mpeg_decode_mb(MpegEncContext *s,
212                           DCTELEM block[12][64])
213 {
214     int i, j, k, cbp, val, mb_type, motion_type;
215     const int mb_block_count = 4 + (1<< s->chroma_format);
216
217     av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
218
219     assert(s->mb_skipped==0);
220
221     if (s->mb_skip_run-- != 0) {
222         if (s->pict_type == AV_PICTURE_TYPE_P) {
223             s->mb_skipped = 1;
224             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
225         } else {
226             int mb_type;
227
228             if(s->mb_x)
229                 mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
230             else
231                 mb_type= s->current_picture.mb_type[ s->mb_width + (s->mb_y-1)*s->mb_stride - 1]; // FIXME not sure if this is allowed in MPEG at all
232             if(IS_INTRA(mb_type))
233                 return -1;
234
235             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
236                 mb_type | MB_TYPE_SKIP;
237 //            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
238
239             if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
240                 s->mb_skipped = 1;
241         }
242
243         return 0;
244     }
245
246     switch(s->pict_type) {
247     default:
248     case AV_PICTURE_TYPE_I:
249         if (get_bits1(&s->gb) == 0) {
250             if (get_bits1(&s->gb) == 0){
251                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
252                 return -1;
253             }
254             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
255         } else {
256             mb_type = MB_TYPE_INTRA;
257         }
258         break;
259     case AV_PICTURE_TYPE_P:
260         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
261         if (mb_type < 0){
262             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
263             return -1;
264         }
265         mb_type = ptype2mb_type[ mb_type ];
266         break;
267     case AV_PICTURE_TYPE_B:
268         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
269         if (mb_type < 0){
270             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
271             return -1;
272         }
273         mb_type = btype2mb_type[ mb_type ];
274         break;
275     }
276     av_dlog(s->avctx, "mb_type=%x\n", mb_type);
277 //    motion_type = 0; /* avoid warning */
278     if (IS_INTRA(mb_type)) {
279         s->dsp.clear_blocks(s->block[0]);
280
281         if(!s->chroma_y_shift){
282             s->dsp.clear_blocks(s->block[6]);
283         }
284
285         /* compute DCT type */
286         if (s->picture_structure == PICT_FRAME && //FIXME add an interlaced_dct coded var?
287             !s->frame_pred_frame_dct) {
288             s->interlaced_dct = get_bits1(&s->gb);
289         }
290
291         if (IS_QUANT(mb_type))
292             s->qscale = get_qscale(s);
293
294         if (s->concealment_motion_vectors) {
295             /* just parse them */
296             if (s->picture_structure != PICT_FRAME)
297                 skip_bits1(&s->gb); /* field select */
298
299             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
300                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
301             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
302                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
303
304             skip_bits1(&s->gb); /* marker */
305         }else
306             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
307         s->mb_intra = 1;
308         //if 1, we memcpy blocks in xvmcvideo
309         if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
310             ff_xvmc_pack_pblocks(s,-1);//inter are always full blocks
311             if(s->swap_uv){
312                 exchange_uv(s);
313             }
314         }
315
316         if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
317             if(s->flags2 & CODEC_FLAG2_FAST){
318                 for(i=0;i<6;i++) {
319                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
320                 }
321             }else{
322                 for(i=0;i<mb_block_count;i++) {
323                     if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
324                         return -1;
325                 }
326             }
327         } else {
328             for(i=0;i<6;i++) {
329                 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
330                     return -1;
331             }
332         }
333     } else {
334         if (mb_type & MB_TYPE_ZERO_MV){
335             assert(mb_type & MB_TYPE_CBP);
336
337             s->mv_dir = MV_DIR_FORWARD;
338             if(s->picture_structure == PICT_FRAME){
339                 if(!s->frame_pred_frame_dct)
340                     s->interlaced_dct = get_bits1(&s->gb);
341                 s->mv_type = MV_TYPE_16X16;
342             }else{
343                 s->mv_type = MV_TYPE_FIELD;
344                 mb_type |= MB_TYPE_INTERLACED;
345                 s->field_select[0][0]= s->picture_structure - 1;
346             }
347
348             if (IS_QUANT(mb_type))
349                 s->qscale = get_qscale(s);
350
351             s->last_mv[0][0][0] = 0;
352             s->last_mv[0][0][1] = 0;
353             s->last_mv[0][1][0] = 0;
354             s->last_mv[0][1][1] = 0;
355             s->mv[0][0][0] = 0;
356             s->mv[0][0][1] = 0;
357         }else{
358             assert(mb_type & MB_TYPE_L0L1);
359 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
360             /* get additional motion vector type */
361             if (s->frame_pred_frame_dct)
362                 motion_type = MT_FRAME;
363             else{
364                 motion_type = get_bits(&s->gb, 2);
365                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
366                     s->interlaced_dct = get_bits1(&s->gb);
367             }
368
369             if (IS_QUANT(mb_type))
370                 s->qscale = get_qscale(s);
371
372             /* motion vectors */
373             s->mv_dir= (mb_type>>13)&3;
374             av_dlog(s->avctx, "motion_type=%d\n", motion_type);
375             switch(motion_type) {
376             case MT_FRAME: /* or MT_16X8 */
377                 if (s->picture_structure == PICT_FRAME) {
378                     mb_type |= MB_TYPE_16x16;
379                     s->mv_type = MV_TYPE_16X16;
380                     for(i=0;i<2;i++) {
381                         if (USES_LIST(mb_type, i)) {
382                             /* MT_FRAME */
383                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
384                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
385                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
386                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
387                             /* full_pel: only for MPEG-1 */
388                             if (s->full_pel[i]){
389                                 s->mv[i][0][0] <<= 1;
390                                 s->mv[i][0][1] <<= 1;
391                             }
392                         }
393                     }
394                 } else {
395                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
396                     s->mv_type = MV_TYPE_16X8;
397                     for(i=0;i<2;i++) {
398                         if (USES_LIST(mb_type, i)) {
399                             /* MT_16X8 */
400                             for(j=0;j<2;j++) {
401                                 s->field_select[i][j] = get_bits1(&s->gb);
402                                 for(k=0;k<2;k++) {
403                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
404                                                              s->last_mv[i][j][k]);
405                                     s->last_mv[i][j][k] = val;
406                                     s->mv[i][j][k] = val;
407                                 }
408                             }
409                         }
410                     }
411                 }
412                 break;
413             case MT_FIELD:
414                 s->mv_type = MV_TYPE_FIELD;
415                 if (s->picture_structure == PICT_FRAME) {
416                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
417                     for(i=0;i<2;i++) {
418                         if (USES_LIST(mb_type, i)) {
419                             for(j=0;j<2;j++) {
420                                 s->field_select[i][j] = get_bits1(&s->gb);
421                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
422                                                          s->last_mv[i][j][0]);
423                                 s->last_mv[i][j][0] = val;
424                                 s->mv[i][j][0] = val;
425                                 av_dlog(s->avctx, "fmx=%d\n", val);
426                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
427                                                          s->last_mv[i][j][1] >> 1);
428                                 s->last_mv[i][j][1] = val << 1;
429                                 s->mv[i][j][1] = val;
430                                 av_dlog(s->avctx, "fmy=%d\n", val);
431                             }
432                         }
433                     }
434                 } else {
435                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
436                     for(i=0;i<2;i++) {
437                         if (USES_LIST(mb_type, i)) {
438                             s->field_select[i][0] = get_bits1(&s->gb);
439                             for(k=0;k<2;k++) {
440                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
441                                                          s->last_mv[i][0][k]);
442                                 s->last_mv[i][0][k] = val;
443                                 s->last_mv[i][1][k] = val;
444                                 s->mv[i][0][k] = val;
445                             }
446                         }
447                     }
448                 }
449                 break;
450             case MT_DMV:
451                 s->mv_type = MV_TYPE_DMV;
452                 for(i=0;i<2;i++) {
453                     if (USES_LIST(mb_type, i)) {
454                         int dmx, dmy, mx, my, m;
455                         const int my_shift= s->picture_structure == PICT_FRAME;
456
457                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
458                                                 s->last_mv[i][0][0]);
459                         s->last_mv[i][0][0] = mx;
460                         s->last_mv[i][1][0] = mx;
461                         dmx = get_dmv(s);
462                         my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
463                                                 s->last_mv[i][0][1] >> my_shift);
464                         dmy = get_dmv(s);
465
466
467                         s->last_mv[i][0][1] = my<<my_shift;
468                         s->last_mv[i][1][1] = my<<my_shift;
469
470                         s->mv[i][0][0] = mx;
471                         s->mv[i][0][1] = my;
472                         s->mv[i][1][0] = mx;//not used
473                         s->mv[i][1][1] = my;//not used
474
475                         if (s->picture_structure == PICT_FRAME) {
476                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
477
478                             //m = 1 + 2 * s->top_field_first;
479                             m = s->top_field_first ? 1 : 3;
480
481                             /* top -> top pred */
482                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
483                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
484                             m = 4 - m;
485                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
486                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
487                         } else {
488                             mb_type |= MB_TYPE_16x16;
489
490                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
491                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
492                             if(s->picture_structure == PICT_TOP_FIELD)
493                                 s->mv[i][2][1]--;
494                             else
495                                 s->mv[i][2][1]++;
496                         }
497                     }
498                 }
499                 break;
500             default:
501                 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
502                 return -1;
503             }
504         }
505
506         s->mb_intra = 0;
507         if (HAS_CBP(mb_type)) {
508             s->dsp.clear_blocks(s->block[0]);
509
510             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
511             if(mb_block_count > 6){
512                  cbp<<= mb_block_count-6;
513                  cbp |= get_bits(&s->gb, mb_block_count-6);
514                  s->dsp.clear_blocks(s->block[6]);
515             }
516             if (cbp <= 0){
517                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
518                 return -1;
519             }
520
521             //if 1, we memcpy blocks in xvmcvideo
522             if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
523                 ff_xvmc_pack_pblocks(s,cbp);
524                 if(s->swap_uv){
525                     exchange_uv(s);
526                 }
527             }
528
529             if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
530                 if(s->flags2 & CODEC_FLAG2_FAST){
531                     for(i=0;i<6;i++) {
532                         if(cbp & 32) {
533                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
534                         } else {
535                             s->block_last_index[i] = -1;
536                         }
537                         cbp+=cbp;
538                     }
539                 }else{
540                     cbp<<= 12-mb_block_count;
541
542                     for(i=0;i<mb_block_count;i++) {
543                         if ( cbp & (1<<11) ) {
544                             if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
545                                 return -1;
546                         } else {
547                             s->block_last_index[i] = -1;
548                         }
549                         cbp+=cbp;
550                     }
551                 }
552             } else {
553                 if(s->flags2 & CODEC_FLAG2_FAST){
554                     for(i=0;i<6;i++) {
555                         if (cbp & 32) {
556                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
557                         } else {
558                             s->block_last_index[i] = -1;
559                         }
560                         cbp+=cbp;
561                     }
562                 }else{
563                     for(i=0;i<6;i++) {
564                         if (cbp & 32) {
565                             if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
566                                 return -1;
567                         } else {
568                             s->block_last_index[i] = -1;
569                         }
570                         cbp+=cbp;
571                     }
572                 }
573             }
574         }else{
575             for(i=0;i<12;i++)
576                 s->block_last_index[i] = -1;
577         }
578     }
579
580     s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
581
582     return 0;
583 }
584
585 /* as H.263, but only 17 codes */
586 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
587 {
588     int code, sign, val, l, shift;
589
590     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
591     if (code == 0) {
592         return pred;
593     }
594     if (code < 0) {
595         return 0xffff;
596     }
597
598     sign = get_bits1(&s->gb);
599     shift = fcode - 1;
600     val = code;
601     if (shift) {
602         val = (val - 1) << shift;
603         val |= get_bits(&s->gb, shift);
604         val++;
605     }
606     if (sign)
607         val = -val;
608     val += pred;
609
610     /* modulo decoding */
611     l= INT_BIT - 5 - shift;
612     val = (val<<l)>>l;
613     return val;
614 }
615
616 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
617                                DCTELEM *block,
618                                int n)
619 {
620     int level, dc, diff, i, j, run;
621     int component;
622     RLTable *rl = &ff_rl_mpeg1;
623     uint8_t * const scantable= s->intra_scantable.permutated;
624     const uint16_t *quant_matrix= s->intra_matrix;
625     const int qscale= s->qscale;
626
627     /* DC coefficient */
628     component = (n <= 3 ? 0 : n - 4 + 1);
629     diff = decode_dc(&s->gb, component);
630     if (diff >= 0xffff)
631         return -1;
632     dc = s->last_dc[component];
633     dc += diff;
634     s->last_dc[component] = dc;
635     block[0] = dc*quant_matrix[0];
636     av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
637     i = 0;
638     {
639         OPEN_READER(re, &s->gb);
640         /* now quantify & encode AC coefficients */
641         for(;;) {
642             UPDATE_CACHE(re, &s->gb);
643             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
644
645             if(level == 127){
646                 break;
647             } else if(level != 0) {
648                 i += run;
649                 j = scantable[i];
650                 level= (level*qscale*quant_matrix[j])>>4;
651                 level= (level-1)|1;
652                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
653                 LAST_SKIP_BITS(re, &s->gb, 1);
654             } else {
655                 /* escape */
656                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
657                 UPDATE_CACHE(re, &s->gb);
658                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
659                 if (level == -128) {
660                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
661                 } else if (level == 0) {
662                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
663                 }
664                 i += run;
665                 j = scantable[i];
666                 if(level<0){
667                     level= -level;
668                     level= (level*qscale*quant_matrix[j])>>4;
669                     level= (level-1)|1;
670                     level= -level;
671                 }else{
672                     level= (level*qscale*quant_matrix[j])>>4;
673                     level= (level-1)|1;
674                 }
675             }
676             if (i > 63){
677                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
678                 return -1;
679             }
680
681             block[j] = level;
682         }
683         CLOSE_READER(re, &s->gb);
684     }
685     s->block_last_index[n] = i;
686    return 0;
687 }
688
689 int ff_mpeg1_decode_block_intra(MpegEncContext *s,
690                                 DCTELEM *block,
691                                 int n)
692 {
693     return mpeg1_decode_block_intra(s, block, n);
694 }
695
696 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
697                                DCTELEM *block,
698                                int n)
699 {
700     int level, i, j, run;
701     RLTable *rl = &ff_rl_mpeg1;
702     uint8_t * const scantable= s->intra_scantable.permutated;
703     const uint16_t *quant_matrix= s->inter_matrix;
704     const int qscale= s->qscale;
705
706     {
707         OPEN_READER(re, &s->gb);
708         i = -1;
709         // special case for first coefficient, no need to add second VLC table
710         UPDATE_CACHE(re, &s->gb);
711         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
712             level= (3*qscale*quant_matrix[0])>>5;
713             level= (level-1)|1;
714             if(GET_CACHE(re, &s->gb)&0x40000000)
715                 level= -level;
716             block[0] = level;
717             i++;
718             SKIP_BITS(re, &s->gb, 2);
719             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
720                 goto end;
721         }
722         /* now quantify & encode AC coefficients */
723         for(;;) {
724             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
725
726             if(level != 0) {
727                 i += run;
728                 j = scantable[i];
729                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
730                 level= (level-1)|1;
731                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
732                 SKIP_BITS(re, &s->gb, 1);
733             } else {
734                 /* escape */
735                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
736                 UPDATE_CACHE(re, &s->gb);
737                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
738                 if (level == -128) {
739                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
740                 } else if (level == 0) {
741                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
742                 }
743                 i += run;
744                 j = scantable[i];
745                 if(level<0){
746                     level= -level;
747                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
748                     level= (level-1)|1;
749                     level= -level;
750                 }else{
751                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
752                     level= (level-1)|1;
753                 }
754             }
755             if (i > 63){
756                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
757                 return -1;
758             }
759
760             block[j] = level;
761             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
762                 break;
763             UPDATE_CACHE(re, &s->gb);
764         }
765 end:
766         LAST_SKIP_BITS(re, &s->gb, 2);
767         CLOSE_READER(re, &s->gb);
768     }
769     s->block_last_index[n] = i;
770     return 0;
771 }
772
773 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
774 {
775     int level, i, j, run;
776     RLTable *rl = &ff_rl_mpeg1;
777     uint8_t * const scantable= s->intra_scantable.permutated;
778     const int qscale= s->qscale;
779
780     {
781         OPEN_READER(re, &s->gb);
782         i = -1;
783         // special case for first coefficient, no need to add second VLC table
784         UPDATE_CACHE(re, &s->gb);
785         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
786             level= (3*qscale)>>1;
787             level= (level-1)|1;
788             if(GET_CACHE(re, &s->gb)&0x40000000)
789                 level= -level;
790             block[0] = level;
791             i++;
792             SKIP_BITS(re, &s->gb, 2);
793             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
794                 goto end;
795         }
796
797         /* now quantify & encode AC coefficients */
798         for(;;) {
799             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
800
801             if(level != 0) {
802                 i += run;
803                 j = scantable[i];
804                 level= ((level*2+1)*qscale)>>1;
805                 level= (level-1)|1;
806                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
807                 SKIP_BITS(re, &s->gb, 1);
808             } else {
809                 /* escape */
810                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
811                 UPDATE_CACHE(re, &s->gb);
812                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
813                 if (level == -128) {
814                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
815                 } else if (level == 0) {
816                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
817                 }
818                 i += run;
819                 j = scantable[i];
820                 if(level<0){
821                     level= -level;
822                     level= ((level*2+1)*qscale)>>1;
823                     level= (level-1)|1;
824                     level= -level;
825                 }else{
826                     level= ((level*2+1)*qscale)>>1;
827                     level= (level-1)|1;
828                 }
829             }
830
831             block[j] = level;
832             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
833                 break;
834             UPDATE_CACHE(re, &s->gb);
835         }
836 end:
837         LAST_SKIP_BITS(re, &s->gb, 2);
838         CLOSE_READER(re, &s->gb);
839     }
840     s->block_last_index[n] = i;
841     return 0;
842 }
843
844
845 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
846                                DCTELEM *block,
847                                int n)
848 {
849     int level, i, j, run;
850     RLTable *rl = &ff_rl_mpeg1;
851     uint8_t * const scantable= s->intra_scantable.permutated;
852     const uint16_t *quant_matrix;
853     const int qscale= s->qscale;
854     int mismatch;
855
856     mismatch = 1;
857
858     {
859         OPEN_READER(re, &s->gb);
860         i = -1;
861         if (n < 4)
862             quant_matrix = s->inter_matrix;
863         else
864             quant_matrix = s->chroma_inter_matrix;
865
866         // special case for first coefficient, no need to add second VLC table
867         UPDATE_CACHE(re, &s->gb);
868         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
869             level= (3*qscale*quant_matrix[0])>>5;
870             if(GET_CACHE(re, &s->gb)&0x40000000)
871                 level= -level;
872             block[0] = level;
873             mismatch ^= level;
874             i++;
875             SKIP_BITS(re, &s->gb, 2);
876             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
877                 goto end;
878         }
879
880         /* now quantify & encode AC coefficients */
881         for(;;) {
882             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
883
884             if(level != 0) {
885                 i += run;
886                 j = scantable[i];
887                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
888                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
889                 SKIP_BITS(re, &s->gb, 1);
890             } else {
891                 /* escape */
892                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
893                 UPDATE_CACHE(re, &s->gb);
894                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
895
896                 i += run;
897                 j = scantable[i];
898                 if(level<0){
899                     level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
900                     level= -level;
901                 }else{
902                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
903                 }
904             }
905             if (i > 63){
906                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
907                 return -1;
908             }
909
910             mismatch ^= level;
911             block[j] = level;
912             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
913                 break;
914             UPDATE_CACHE(re, &s->gb);
915         }
916 end:
917         LAST_SKIP_BITS(re, &s->gb, 2);
918         CLOSE_READER(re, &s->gb);
919     }
920     block[63] ^= (mismatch & 1);
921
922     s->block_last_index[n] = i;
923     return 0;
924 }
925
926 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
927                                DCTELEM *block,
928                                int n)
929 {
930     int level, i, j, run;
931     RLTable *rl = &ff_rl_mpeg1;
932     uint8_t * const scantable= s->intra_scantable.permutated;
933     const int qscale= s->qscale;
934     OPEN_READER(re, &s->gb);
935     i = -1;
936
937     // special case for first coefficient, no need to add second VLC table
938     UPDATE_CACHE(re, &s->gb);
939     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
940         level= (3*qscale)>>1;
941         if(GET_CACHE(re, &s->gb)&0x40000000)
942             level= -level;
943         block[0] = level;
944         i++;
945         SKIP_BITS(re, &s->gb, 2);
946         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
947             goto end;
948     }
949
950     /* now quantify & encode AC coefficients */
951     for(;;) {
952         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
953
954         if(level != 0) {
955             i += run;
956             j = scantable[i];
957             level= ((level*2+1)*qscale)>>1;
958             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
959             SKIP_BITS(re, &s->gb, 1);
960         } else {
961             /* escape */
962             run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
963             UPDATE_CACHE(re, &s->gb);
964             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
965
966             i += run;
967             j = scantable[i];
968             if(level<0){
969                 level= ((-level*2+1)*qscale)>>1;
970                 level= -level;
971             }else{
972                 level= ((level*2+1)*qscale)>>1;
973             }
974         }
975
976         block[j] = level;
977         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
978             break;
979         UPDATE_CACHE(re, &s->gb);
980     }
981 end:
982     LAST_SKIP_BITS(re, &s->gb, 2);
983     CLOSE_READER(re, &s->gb);
984     s->block_last_index[n] = i;
985     return 0;
986 }
987
988
989 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
990                                DCTELEM *block,
991                                int n)
992 {
993     int level, dc, diff, i, j, run;
994     int component;
995     RLTable *rl;
996     uint8_t * const scantable= s->intra_scantable.permutated;
997     const uint16_t *quant_matrix;
998     const int qscale= s->qscale;
999     int mismatch;
1000
1001     /* DC coefficient */
1002     if (n < 4){
1003         quant_matrix = s->intra_matrix;
1004         component = 0;
1005     }else{
1006         quant_matrix = s->chroma_intra_matrix;
1007         component = (n&1) + 1;
1008     }
1009     diff = decode_dc(&s->gb, component);
1010     if (diff >= 0xffff)
1011         return -1;
1012     dc = s->last_dc[component];
1013     dc += diff;
1014     s->last_dc[component] = dc;
1015     block[0] = dc << (3 - s->intra_dc_precision);
1016     av_dlog(s->avctx, "dc=%d\n", block[0]);
1017     mismatch = block[0] ^ 1;
1018     i = 0;
1019     if (s->intra_vlc_format)
1020         rl = &ff_rl_mpeg2;
1021     else
1022         rl = &ff_rl_mpeg1;
1023
1024     {
1025         OPEN_READER(re, &s->gb);
1026         /* now quantify & encode AC coefficients */
1027         for(;;) {
1028             UPDATE_CACHE(re, &s->gb);
1029             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1030
1031             if(level == 127){
1032                 break;
1033             } else if(level != 0) {
1034                 i += run;
1035                 j = scantable[i];
1036                 level= (level*qscale*quant_matrix[j])>>4;
1037                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1038                 LAST_SKIP_BITS(re, &s->gb, 1);
1039             } else {
1040                 /* escape */
1041                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1042                 UPDATE_CACHE(re, &s->gb);
1043                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1044                 i += run;
1045                 j = scantable[i];
1046                 if(level<0){
1047                     level= (-level*qscale*quant_matrix[j])>>4;
1048                     level= -level;
1049                 }else{
1050                     level= (level*qscale*quant_matrix[j])>>4;
1051                 }
1052             }
1053             if (i > 63){
1054                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1055                 return -1;
1056             }
1057
1058             mismatch^= level;
1059             block[j] = level;
1060         }
1061         CLOSE_READER(re, &s->gb);
1062     }
1063     block[63]^= mismatch&1;
1064
1065     s->block_last_index[n] = i;
1066     return 0;
1067 }
1068
1069 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1070                                DCTELEM *block,
1071                                int n)
1072 {
1073     int level, dc, diff, j, run;
1074     int component;
1075     RLTable *rl;
1076     uint8_t * scantable= s->intra_scantable.permutated;
1077     const uint16_t *quant_matrix;
1078     const int qscale= s->qscale;
1079
1080     /* DC coefficient */
1081     if (n < 4){
1082         quant_matrix = s->intra_matrix;
1083         component = 0;
1084     }else{
1085         quant_matrix = s->chroma_intra_matrix;
1086         component = (n&1) + 1;
1087     }
1088     diff = decode_dc(&s->gb, component);
1089     if (diff >= 0xffff)
1090         return -1;
1091     dc = s->last_dc[component];
1092     dc += diff;
1093     s->last_dc[component] = dc;
1094     block[0] = dc << (3 - s->intra_dc_precision);
1095     if (s->intra_vlc_format)
1096         rl = &ff_rl_mpeg2;
1097     else
1098         rl = &ff_rl_mpeg1;
1099
1100     {
1101         OPEN_READER(re, &s->gb);
1102         /* now quantify & encode AC coefficients */
1103         for(;;) {
1104             UPDATE_CACHE(re, &s->gb);
1105             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1106
1107             if(level == 127){
1108                 break;
1109             } else if(level != 0) {
1110                 scantable += run;
1111                 j = *scantable;
1112                 level= (level*qscale*quant_matrix[j])>>4;
1113                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1114                 LAST_SKIP_BITS(re, &s->gb, 1);
1115             } else {
1116                 /* escape */
1117                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1118                 UPDATE_CACHE(re, &s->gb);
1119                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1120                 scantable += run;
1121                 j = *scantable;
1122                 if(level<0){
1123                     level= (-level*qscale*quant_matrix[j])>>4;
1124                     level= -level;
1125                 }else{
1126                     level= (level*qscale*quant_matrix[j])>>4;
1127                 }
1128             }
1129
1130             block[j] = level;
1131         }
1132         CLOSE_READER(re, &s->gb);
1133     }
1134
1135     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1136     return 0;
1137 }
1138
1139 typedef struct Mpeg1Context {
1140     MpegEncContext mpeg_enc_ctx;
1141     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1142     int repeat_field; /* true if we must repeat the field */
1143     AVPanScan pan_scan;              /**< some temporary storage for the panscan */
1144     int slice_count;
1145     int swap_uv;//indicate VCR2
1146     int save_aspect_info;
1147     int save_width, save_height, save_progressive_seq;
1148     AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
1149     int sync;                        ///< Did we reach a sync point like a GOP/SEQ/KEYFrame?
1150 } Mpeg1Context;
1151
1152 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1153 {
1154     Mpeg1Context *s = avctx->priv_data;
1155     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1156     int i;
1157
1158     /* we need some permutation to store matrices,
1159      * until MPV_common_init() sets the real permutation. */
1160     for(i=0;i<64;i++)
1161        s2->dsp.idct_permutation[i]=i;
1162
1163     MPV_decode_defaults(s2);
1164
1165     s->mpeg_enc_ctx.avctx= avctx;
1166     s->mpeg_enc_ctx.flags= avctx->flags;
1167     s->mpeg_enc_ctx.flags2= avctx->flags2;
1168     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1169     ff_mpeg12_init_vlcs();
1170
1171     s->mpeg_enc_ctx_allocated = 0;
1172     s->mpeg_enc_ctx.picture_number = 0;
1173     s->repeat_field = 0;
1174     s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1175     avctx->color_range= AVCOL_RANGE_MPEG;
1176     if (avctx->codec->id == CODEC_ID_MPEG1VIDEO)
1177         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1178     else
1179         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1180     return 0;
1181 }
1182
1183 static int mpeg_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
1184 {
1185     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1186     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1187     int err;
1188
1189     if(avctx == avctx_from || !ctx_from->mpeg_enc_ctx_allocated || !s1->context_initialized)
1190         return 0;
1191
1192     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1193     if(err) return err;
1194
1195     if(!ctx->mpeg_enc_ctx_allocated)
1196         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1197
1198     if(!(s->pict_type == FF_B_TYPE || s->low_delay))
1199         s->picture_number++;
1200
1201     return 0;
1202 }
1203
1204 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1205                                      const uint8_t *new_perm){
1206     uint16_t temp_matrix[64];
1207     int i;
1208
1209     memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1210
1211     for(i=0;i<64;i++){
1212         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1213     }
1214 }
1215
1216 static enum PixelFormat mpeg_get_pixelformat(AVCodecContext *avctx){
1217     Mpeg1Context *s1 = avctx->priv_data;
1218     MpegEncContext *s = &s1->mpeg_enc_ctx;
1219
1220     if(avctx->xvmc_acceleration)
1221         return avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1222     else if(avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU){
1223         if(avctx->codec_id == CODEC_ID_MPEG1VIDEO)
1224             return PIX_FMT_VDPAU_MPEG1;
1225         else
1226             return PIX_FMT_VDPAU_MPEG2;
1227     }else{
1228         if(s->chroma_format <  2)
1229             return avctx->get_format(avctx,ff_hwaccel_pixfmt_list_420);
1230         else if(s->chroma_format == 2)
1231             return PIX_FMT_YUV422P;
1232         else
1233             return PIX_FMT_YUV444P;
1234     }
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     Mpeg1Context *s1 = avctx->priv_data;
1241     MpegEncContext *s = &s1->mpeg_enc_ctx;
1242     uint8_t old_permutation[64];
1243
1244     if (
1245         (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             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         assert((avctx->sub_id==1) == (avctx->codec_id==CODEC_ID_MPEG1VIDEO));
1277         if(avctx->codec_id==CODEC_ID_MPEG1VIDEO){
1278             //MPEG-1 fps
1279             avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1280             avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1281             //MPEG-1 aspect
1282             avctx->sample_aspect_ratio= av_d2q(
1283                     1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1284             avctx->ticks_per_frame=1;
1285         }else{//MPEG-2
1286         //MPEG-2 fps
1287             av_reduce(
1288                 &s->avctx->time_base.den,
1289                 &s->avctx->time_base.num,
1290                 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1291                 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1292                 1<<30);
1293             avctx->ticks_per_frame=2;
1294         //MPEG-2 aspect
1295             if(s->aspect_ratio_info > 1){
1296                 //we ignore the spec here as reality does not match the spec, see for example
1297                 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1298                 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) || 1){
1299                     s->avctx->sample_aspect_ratio=
1300                         av_div_q(
1301                          ff_mpeg2_aspect[s->aspect_ratio_info],
1302                          (AVRational){s->width, s->height}
1303                          );
1304                 }else{
1305                     s->avctx->sample_aspect_ratio=
1306                         av_div_q(
1307                          ff_mpeg2_aspect[s->aspect_ratio_info],
1308                          (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1309                         );
1310                 }
1311             }else{
1312                 s->avctx->sample_aspect_ratio=
1313                     ff_mpeg2_aspect[s->aspect_ratio_info];
1314             }
1315         }//MPEG-2
1316
1317         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1318         avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1319         //until then pix_fmt may be changed right after codec init
1320         if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
1321             avctx->hwaccel ||
1322             s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
1323             if( avctx->idct_algo == FF_IDCT_AUTO )
1324                 avctx->idct_algo = FF_IDCT_SIMPLE;
1325
1326         /* Quantization matrices may need reordering
1327          * if DCT permutation is changed. */
1328         memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1329
1330         if (MPV_common_init(s) < 0)
1331             return -2;
1332
1333         quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
1334         quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
1335         quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1336         quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1337
1338         s1->mpeg_enc_ctx_allocated = 1;
1339     }
1340     return 0;
1341 }
1342
1343 static int mpeg1_decode_picture(AVCodecContext *avctx,
1344                                 const uint8_t *buf, int buf_size)
1345 {
1346     Mpeg1Context *s1 = avctx->priv_data;
1347     MpegEncContext *s = &s1->mpeg_enc_ctx;
1348     int ref, f_code, vbv_delay;
1349
1350     init_get_bits(&s->gb, buf, buf_size*8);
1351
1352     ref = get_bits(&s->gb, 10); /* temporal ref */
1353     s->pict_type = get_bits(&s->gb, 3);
1354     if(s->pict_type == 0 || s->pict_type > 3)
1355         return -1;
1356
1357     vbv_delay= get_bits(&s->gb, 16);
1358     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
1359         s->full_pel[0] = get_bits1(&s->gb);
1360         f_code = get_bits(&s->gb, 3);
1361         if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1362             return -1;
1363         s->mpeg_f_code[0][0] = f_code;
1364         s->mpeg_f_code[0][1] = f_code;
1365     }
1366     if (s->pict_type == AV_PICTURE_TYPE_B) {
1367         s->full_pel[1] = get_bits1(&s->gb);
1368         f_code = get_bits(&s->gb, 3);
1369         if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1370             return -1;
1371         s->mpeg_f_code[1][0] = f_code;
1372         s->mpeg_f_code[1][1] = f_code;
1373     }
1374     s->current_picture.pict_type= s->pict_type;
1375     s->current_picture.key_frame= s->pict_type == AV_PICTURE_TYPE_I;
1376
1377     if(avctx->debug & FF_DEBUG_PICT_INFO)
1378         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1379
1380     s->y_dc_scale = 8;
1381     s->c_dc_scale = 8;
1382     return 0;
1383 }
1384
1385 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1386 {
1387     MpegEncContext *s= &s1->mpeg_enc_ctx;
1388     int horiz_size_ext, vert_size_ext;
1389     int bit_rate_ext;
1390
1391     skip_bits(&s->gb, 1); /* profile and level esc*/
1392     s->avctx->profile= get_bits(&s->gb, 3);
1393     s->avctx->level= get_bits(&s->gb, 4);
1394     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1395     s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1396     horiz_size_ext = get_bits(&s->gb, 2);
1397     vert_size_ext = get_bits(&s->gb, 2);
1398     s->width |= (horiz_size_ext << 12);
1399     s->height |= (vert_size_ext << 12);
1400     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1401     s->bit_rate += (bit_rate_ext << 18) * 400;
1402     skip_bits1(&s->gb); /* marker */
1403     s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1404
1405     s->low_delay = get_bits1(&s->gb);
1406     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1407
1408     s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1409     s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1410
1411     av_dlog(s->avctx, "sequence extension\n");
1412     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1413     s->avctx->sub_id = 2; /* indicates MPEG-2 found */
1414
1415     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1416         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1417                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1418
1419 }
1420
1421 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1422 {
1423     MpegEncContext *s= &s1->mpeg_enc_ctx;
1424     int color_description, w, h;
1425
1426     skip_bits(&s->gb, 3); /* video format */
1427     color_description= get_bits1(&s->gb);
1428     if(color_description){
1429         s->avctx->color_primaries= get_bits(&s->gb, 8);
1430         s->avctx->color_trc      = get_bits(&s->gb, 8);
1431         s->avctx->colorspace     = get_bits(&s->gb, 8);
1432     }
1433     w= get_bits(&s->gb, 14);
1434     skip_bits(&s->gb, 1); //marker
1435     h= get_bits(&s->gb, 14);
1436     // remaining 3 bits are zero padding
1437
1438     s1->pan_scan.width= 16*w;
1439     s1->pan_scan.height=16*h;
1440
1441     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1442         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1443 }
1444
1445 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1446 {
1447     MpegEncContext *s= &s1->mpeg_enc_ctx;
1448     int i,nofco;
1449
1450     nofco = 1;
1451     if(s->progressive_sequence){
1452         if(s->repeat_first_field){
1453             nofco++;
1454             if(s->top_field_first)
1455                 nofco++;
1456         }
1457     }else{
1458         if(s->picture_structure == PICT_FRAME){
1459             nofco++;
1460             if(s->repeat_first_field)
1461                 nofco++;
1462         }
1463     }
1464     for(i=0; i<nofco; i++){
1465         s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1466         skip_bits(&s->gb, 1); //marker
1467         s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1468         skip_bits(&s->gb, 1); //marker
1469     }
1470
1471     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1472         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1473             s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1474             s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1475             s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1476         );
1477 }
1478
1479 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra){
1480     int i;
1481
1482     for(i=0; i<64; i++) {
1483         int j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1484         int v = get_bits(&s->gb, 8);
1485         if(v==0){
1486             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1487             return -1;
1488         }
1489         if(intra && i==0 && v!=8){
1490             av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
1491             v= 8; // needed by pink.mpg / issue1046
1492         }
1493         matrix0[j] = v;
1494         if(matrix1)
1495             matrix1[j] = v;
1496     }
1497     return 0;
1498 }
1499
1500 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1501 {
1502     av_dlog(s->avctx, "matrix extension\n");
1503
1504     if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1505     if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1506     if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL           , 1);
1507     if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL           , 0);
1508 }
1509
1510 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1511 {
1512     MpegEncContext *s= &s1->mpeg_enc_ctx;
1513
1514     s->full_pel[0] = s->full_pel[1] = 0;
1515     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1516     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1517     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1518     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1519     if(!s->pict_type && s1->mpeg_enc_ctx_allocated){
1520         av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1521         if(s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1]==15){
1522             if(s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1523                 s->pict_type= AV_PICTURE_TYPE_I;
1524             else
1525                 s->pict_type= AV_PICTURE_TYPE_P;
1526         }else
1527             s->pict_type= AV_PICTURE_TYPE_B;
1528         s->current_picture.pict_type= s->pict_type;
1529         s->current_picture.key_frame= s->pict_type == AV_PICTURE_TYPE_I;
1530     }
1531     s->intra_dc_precision = get_bits(&s->gb, 2);
1532     s->picture_structure = get_bits(&s->gb, 2);
1533     s->top_field_first = get_bits1(&s->gb);
1534     s->frame_pred_frame_dct = get_bits1(&s->gb);
1535     s->concealment_motion_vectors = get_bits1(&s->gb);
1536     s->q_scale_type = get_bits1(&s->gb);
1537     s->intra_vlc_format = get_bits1(&s->gb);
1538     s->alternate_scan = get_bits1(&s->gb);
1539     s->repeat_first_field = get_bits1(&s->gb);
1540     s->chroma_420_type = get_bits1(&s->gb);
1541     s->progressive_frame = get_bits1(&s->gb);
1542
1543     if(s->progressive_sequence && !s->progressive_frame){
1544         s->progressive_frame= 1;
1545         av_log(s->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
1546     }
1547
1548     if(s->picture_structure==0 || (s->progressive_frame && s->picture_structure!=PICT_FRAME)){
1549         av_log(s->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s->picture_structure);
1550         s->picture_structure= PICT_FRAME;
1551     }
1552
1553     if(s->progressive_sequence && !s->frame_pred_frame_dct){
1554         av_log(s->avctx, AV_LOG_ERROR, "invalid frame_pred_frame_dct\n");
1555         s->frame_pred_frame_dct= 1;
1556     }
1557
1558     if(s->picture_structure == PICT_FRAME){
1559         s->first_field=0;
1560         s->v_edge_pos= 16*s->mb_height;
1561     }else{
1562         s->first_field ^= 1;
1563         s->v_edge_pos=  8*s->mb_height;
1564         memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1565     }
1566
1567     if(s->alternate_scan){
1568         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
1569         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
1570     }else{
1571         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
1572         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
1573     }
1574
1575     /* composite display not parsed */
1576     av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1577     av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1578     av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1579     av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1580     av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1581     av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1582     av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1583     av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1584     av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1585 }
1586
1587 static void exchange_uv(MpegEncContext *s){
1588     DCTELEM (*tmp)[64];
1589
1590     tmp           = s->pblocks[4];
1591     s->pblocks[4] = s->pblocks[5];
1592     s->pblocks[5] = tmp;
1593 }
1594
1595 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size){
1596     AVCodecContext *avctx= s->avctx;
1597     Mpeg1Context *s1 = (Mpeg1Context*)s;
1598
1599     /* start frame decoding */
1600     if(s->first_field || s->picture_structure==PICT_FRAME){
1601         if(MPV_frame_start(s, avctx) < 0)
1602             return -1;
1603
1604         ff_er_frame_start(s);
1605
1606         /* first check if we must repeat the frame */
1607         s->current_picture_ptr->repeat_pict = 0;
1608         if (s->repeat_first_field) {
1609             if (s->progressive_sequence) {
1610                 if (s->top_field_first)
1611                     s->current_picture_ptr->repeat_pict = 4;
1612                 else
1613                     s->current_picture_ptr->repeat_pict = 2;
1614             } else if (s->progressive_frame) {
1615                 s->current_picture_ptr->repeat_pict = 1;
1616             }
1617         }
1618
1619         *s->current_picture_ptr->pan_scan= s1->pan_scan;
1620
1621         if (HAVE_PTHREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1622             ff_thread_finish_setup(avctx);
1623     }else{ //second field
1624             int i;
1625
1626             if(!s->current_picture_ptr){
1627                 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1628                 return -1;
1629             }
1630
1631             for(i=0; i<4; i++){
1632                 s->current_picture.data[i] = s->current_picture_ptr->data[i];
1633                 if(s->picture_structure == PICT_BOTTOM_FIELD){
1634                     s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1635                 }
1636             }
1637     }
1638
1639     if (avctx->hwaccel) {
1640         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1641             return -1;
1642     }
1643
1644 // MPV_frame_start will call this function too,
1645 // but we need to call it on every field
1646     if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1647         if(ff_xvmc_field_start(s,avctx) < 0)
1648             return -1;
1649
1650     return 0;
1651 }
1652
1653 #define DECODE_SLICE_ERROR -1
1654 #define DECODE_SLICE_OK 0
1655
1656 /**
1657  * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1658  * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1659  *         DECODE_SLICE_OK if this slice is ok<br>
1660  */
1661 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1662                              const uint8_t **buf, int buf_size)
1663 {
1664     MpegEncContext *s = &s1->mpeg_enc_ctx;
1665     AVCodecContext *avctx= s->avctx;
1666     const int field_pic= s->picture_structure != PICT_FRAME;
1667     const int lowres= s->avctx->lowres;
1668
1669     s->resync_mb_x=
1670     s->resync_mb_y= -1;
1671
1672     assert(mb_y < s->mb_height);
1673
1674     init_get_bits(&s->gb, *buf, buf_size*8);
1675
1676     ff_mpeg1_clean_buffers(s);
1677     s->interlaced_dct = 0;
1678
1679     s->qscale = get_qscale(s);
1680
1681     if(s->qscale == 0){
1682         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1683         return -1;
1684     }
1685
1686     /* extra slice info */
1687     while (get_bits1(&s->gb) != 0) {
1688         skip_bits(&s->gb, 8);
1689     }
1690
1691     s->mb_x=0;
1692
1693     if(mb_y==0 && s->codec_tag == AV_RL32("SLIF")){
1694         skip_bits1(&s->gb);
1695     }else{
1696         for(;;) {
1697             int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1698             if (code < 0){
1699                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1700                 return -1;
1701             }
1702             if (code >= 33) {
1703                 if (code == 33) {
1704                     s->mb_x += 33;
1705                 }
1706                 /* otherwise, stuffing, nothing to do */
1707             } else {
1708                 s->mb_x += code;
1709                 break;
1710             }
1711         }
1712     }
1713
1714     if(s->mb_x >= (unsigned)s->mb_width){
1715         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1716         return -1;
1717     }
1718
1719     if (avctx->hwaccel) {
1720         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1721         int start_code = -1;
1722         buf_end = ff_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1723         if (buf_end < *buf + buf_size)
1724             buf_end -= 4;
1725         s->mb_y = mb_y;
1726         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1727             return DECODE_SLICE_ERROR;
1728         *buf = buf_end;
1729         return DECODE_SLICE_OK;
1730     }
1731
1732     s->resync_mb_x= s->mb_x;
1733     s->resync_mb_y= s->mb_y= mb_y;
1734     s->mb_skip_run= 0;
1735     ff_init_block_index(s);
1736
1737     if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1738         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1739              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",
1740                  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],
1741                  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")),
1742                  s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1743                  s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1744                  s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1745         }
1746     }
1747
1748     for(;;) {
1749         //If 1, we memcpy blocks in xvmcvideo.
1750         if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1751             ff_xvmc_init_block(s);//set s->block
1752
1753         if(mpeg_decode_mb(s, s->block) < 0)
1754             return -1;
1755
1756         if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1757             const int wrap = s->b8_stride;
1758             int xy = s->mb_x*2 + s->mb_y*2*wrap;
1759             int b8_xy= 4*(s->mb_x + s->mb_y*s->mb_stride);
1760             int motion_x, motion_y, dir, i;
1761
1762             for(i=0; i<2; i++){
1763                 for(dir=0; dir<2; dir++){
1764                     if (s->mb_intra || (dir==1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1765                         motion_x = motion_y = 0;
1766                     }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1767                         motion_x = s->mv[dir][0][0];
1768                         motion_y = s->mv[dir][0][1];
1769                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1770                         motion_x = s->mv[dir][i][0];
1771                         motion_y = s->mv[dir][i][1];
1772                     }
1773
1774                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1775                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1776                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1777                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1778                     s->current_picture.ref_index [dir][b8_xy    ]=
1779                     s->current_picture.ref_index [dir][b8_xy + 1]= s->field_select[dir][i];
1780                     assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1781                 }
1782                 xy += wrap;
1783                 b8_xy +=2;
1784             }
1785         }
1786
1787         s->dest[0] += 16 >> lowres;
1788         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1789         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1790
1791         MPV_decode_mb(s, s->block);
1792
1793         if (++s->mb_x >= s->mb_width) {
1794             const int mb_size= 16>>s->avctx->lowres;
1795
1796             ff_draw_horiz_band(s, mb_size*(s->mb_y>>field_pic), mb_size);
1797             MPV_report_decode_progress(s);
1798
1799             s->mb_x = 0;
1800             s->mb_y += 1<<field_pic;
1801
1802             if(s->mb_y >= s->mb_height){
1803                 int left= get_bits_left(&s->gb);
1804                 int is_d10= s->chroma_format==2 && s->pict_type==AV_PICTURE_TYPE_I && avctx->profile==0 && avctx->level==5
1805                             && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1806                             && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1807
1808                 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1809                    || (avctx->error_recognition >= FF_ER_AGGRESSIVE && left>8)){
1810                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1811                     return -1;
1812                 }else
1813                     goto eos;
1814             }
1815
1816             ff_init_block_index(s);
1817         }
1818
1819         /* skip mb handling */
1820         if (s->mb_skip_run == -1) {
1821             /* read increment again */
1822             s->mb_skip_run = 0;
1823             for(;;) {
1824                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1825                 if (code < 0){
1826                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1827                     return -1;
1828                 }
1829                 if (code >= 33) {
1830                     if (code == 33) {
1831                         s->mb_skip_run += 33;
1832                     }else if(code == 35){
1833                         if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1834                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1835                             return -1;
1836                         }
1837                         goto eos; /* end of slice */
1838                     }
1839                     /* otherwise, stuffing, nothing to do */
1840                 } else {
1841                     s->mb_skip_run += code;
1842                     break;
1843                 }
1844             }
1845             if(s->mb_skip_run){
1846                 int i;
1847                 if(s->pict_type == AV_PICTURE_TYPE_I){
1848                     av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1849                     return -1;
1850                 }
1851
1852                 /* skip mb */
1853                 s->mb_intra = 0;
1854                 for(i=0;i<12;i++)
1855                     s->block_last_index[i] = -1;
1856                 if(s->picture_structure == PICT_FRAME)
1857                     s->mv_type = MV_TYPE_16X16;
1858                 else
1859                     s->mv_type = MV_TYPE_FIELD;
1860                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1861                     /* if P type, zero motion vector is implied */
1862                     s->mv_dir = MV_DIR_FORWARD;
1863                     s->mv[0][0][0] = s->mv[0][0][1] = 0;
1864                     s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1865                     s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1866                     s->field_select[0][0]= (s->picture_structure - 1) & 1;
1867                 } else {
1868                     /* if B type, reuse previous vectors and directions */
1869                     s->mv[0][0][0] = s->last_mv[0][0][0];
1870                     s->mv[0][0][1] = s->last_mv[0][0][1];
1871                     s->mv[1][0][0] = s->last_mv[1][0][0];
1872                     s->mv[1][0][1] = s->last_mv[1][0][1];
1873                 }
1874             }
1875         }
1876     }
1877 eos: // end of slice
1878     *buf += (get_bits_count(&s->gb)-1)/8;
1879 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1880     return 0;
1881 }
1882
1883 static int slice_decode_thread(AVCodecContext *c, void *arg){
1884     MpegEncContext *s= *(void**)arg;
1885     const uint8_t *buf= s->gb.buffer;
1886     int mb_y= s->start_mb_y;
1887     const int field_pic= s->picture_structure != PICT_FRAME;
1888
1889     s->error_count= (3*(s->end_mb_y - s->start_mb_y)*s->mb_width) >> field_pic;
1890
1891     for(;;){
1892         uint32_t start_code;
1893         int ret;
1894
1895         ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1896         emms_c();
1897 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1898 //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);
1899         if(ret < 0){
1900             if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1901                 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
1902         }else{
1903             ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
1904         }
1905
1906         if(s->mb_y == s->end_mb_y)
1907             return 0;
1908
1909         start_code= -1;
1910         buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1911         mb_y= (start_code - SLICE_MIN_START_CODE) << field_pic;
1912         if (s->picture_structure == PICT_BOTTOM_FIELD)
1913             mb_y++;
1914         if(mb_y < 0 || mb_y >= s->end_mb_y)
1915             return -1;
1916     }
1917
1918     return 0; //not reached
1919 }
1920
1921 /**
1922  * Handle slice ends.
1923  * @return 1 if it seems to be the last slice
1924  */
1925 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1926 {
1927     Mpeg1Context *s1 = avctx->priv_data;
1928     MpegEncContext *s = &s1->mpeg_enc_ctx;
1929
1930     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1931         return 0;
1932
1933     if (s->avctx->hwaccel) {
1934         if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1935             av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1936     }
1937
1938     if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1939         ff_xvmc_field_end(s);
1940
1941     /* end of slice reached */
1942     if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1943         /* end of image */
1944
1945         s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1946
1947         ff_er_frame_end(s);
1948
1949         MPV_frame_end(s);
1950
1951         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
1952             *pict= *(AVFrame*)s->current_picture_ptr;
1953             ff_print_debug_info(s, pict);
1954         } else {
1955             if (avctx->active_thread_type & FF_THREAD_FRAME)
1956                 s->picture_number++;
1957             /* latency of 1 frame for I- and P-frames */
1958             /* XXX: use another variable than picture_number */
1959             if (s->last_picture_ptr != NULL) {
1960                 *pict= *(AVFrame*)s->last_picture_ptr;
1961                  ff_print_debug_info(s, pict);
1962             }
1963         }
1964
1965         return 1;
1966     } else {
1967         return 0;
1968     }
1969 }
1970
1971 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1972                                  const uint8_t *buf, int buf_size)
1973 {
1974     Mpeg1Context *s1 = avctx->priv_data;
1975     MpegEncContext *s = &s1->mpeg_enc_ctx;
1976     int width,height;
1977     int i, v, j;
1978
1979     init_get_bits(&s->gb, buf, buf_size*8);
1980
1981     width = get_bits(&s->gb, 12);
1982     height = get_bits(&s->gb, 12);
1983     if (width <= 0 || height <= 0)
1984         return -1;
1985     s->aspect_ratio_info= get_bits(&s->gb, 4);
1986     if (s->aspect_ratio_info == 0) {
1987         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1988         if (avctx->error_recognition >= FF_ER_COMPLIANT)
1989             return -1;
1990     }
1991     s->frame_rate_index = get_bits(&s->gb, 4);
1992     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1993         return -1;
1994     s->bit_rate = get_bits(&s->gb, 18) * 400;
1995     if (get_bits1(&s->gb) == 0) /* marker */
1996         return -1;
1997     s->width = width;
1998     s->height = height;
1999
2000     s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2001     skip_bits(&s->gb, 1);
2002
2003     /* get matrix */
2004     if (get_bits1(&s->gb)) {
2005         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2006     } else {
2007         for(i=0;i<64;i++) {
2008             j = s->dsp.idct_permutation[i];
2009             v = ff_mpeg1_default_intra_matrix[i];
2010             s->intra_matrix[j] = v;
2011             s->chroma_intra_matrix[j] = v;
2012         }
2013     }
2014     if (get_bits1(&s->gb)) {
2015         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2016     } else {
2017         for(i=0;i<64;i++) {
2018             int j= s->dsp.idct_permutation[i];
2019             v = ff_mpeg1_default_non_intra_matrix[i];
2020             s->inter_matrix[j] = v;
2021             s->chroma_inter_matrix[j] = v;
2022         }
2023     }
2024
2025     if(show_bits(&s->gb, 23) != 0){
2026         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2027         return -1;
2028     }
2029
2030     /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2031     s->progressive_sequence = 1;
2032     s->progressive_frame = 1;
2033     s->picture_structure = PICT_FRAME;
2034     s->frame_pred_frame_dct = 1;
2035     s->chroma_format = 1;
2036     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2037     avctx->sub_id = 1; /* indicates MPEG-1 */
2038     s->out_format = FMT_MPEG1;
2039     s->swap_uv = 0;//AFAIK VCR2 does not have SEQ_HEADER
2040     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2041
2042     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2043         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2044                s->avctx->rc_buffer_size, s->bit_rate);
2045
2046     return 0;
2047 }
2048
2049 static int vcr2_init_sequence(AVCodecContext *avctx)
2050 {
2051     Mpeg1Context *s1 = avctx->priv_data;
2052     MpegEncContext *s = &s1->mpeg_enc_ctx;
2053     int i, v;
2054
2055     /* start new MPEG-1 context decoding */
2056     s->out_format = FMT_MPEG1;
2057     if (s1->mpeg_enc_ctx_allocated) {
2058         MPV_common_end(s);
2059     }
2060     s->width  = avctx->coded_width;
2061     s->height = avctx->coded_height;
2062     avctx->has_b_frames= 0; //true?
2063     s->low_delay= 1;
2064
2065     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2066     avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2067
2068     if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel ||
2069         s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
2070         if( avctx->idct_algo == FF_IDCT_AUTO )
2071             avctx->idct_algo = FF_IDCT_SIMPLE;
2072
2073     if (MPV_common_init(s) < 0)
2074         return -1;
2075     exchange_uv(s);//common init reset pblocks, so we swap them here
2076     s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2077     s1->mpeg_enc_ctx_allocated = 1;
2078
2079     for(i=0;i<64;i++) {
2080         int j= s->dsp.idct_permutation[i];
2081         v = ff_mpeg1_default_intra_matrix[i];
2082         s->intra_matrix[j] = v;
2083         s->chroma_intra_matrix[j] = v;
2084
2085         v = ff_mpeg1_default_non_intra_matrix[i];
2086         s->inter_matrix[j] = v;
2087         s->chroma_inter_matrix[j] = v;
2088     }
2089
2090     s->progressive_sequence = 1;
2091     s->progressive_frame = 1;
2092     s->picture_structure = PICT_FRAME;
2093     s->frame_pred_frame_dct = 1;
2094     s->chroma_format = 1;
2095     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2096     avctx->sub_id = 2; /* indicates MPEG-2 */
2097     s1->save_width           = s->width;
2098     s1->save_height          = s->height;
2099     s1->save_progressive_seq = s->progressive_sequence;
2100     return 0;
2101 }
2102
2103
2104 static void mpeg_decode_user_data(AVCodecContext *avctx,
2105                                   const uint8_t *p, int buf_size)
2106 {
2107     const uint8_t *buf_end = p+buf_size;
2108
2109     /* we parse the DTG active format information */
2110     if (buf_end - p >= 5 &&
2111         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2112         int flags = p[4];
2113         p += 5;
2114         if (flags & 0x80) {
2115             /* skip event id */
2116             p += 2;
2117         }
2118         if (flags & 0x40) {
2119             if (buf_end - p < 1)
2120                 return;
2121             avctx->dtg_active_format = p[0] & 0x0f;
2122         }
2123     }
2124 }
2125
2126 static void mpeg_decode_gop(AVCodecContext *avctx,
2127                             const uint8_t *buf, int buf_size){
2128     Mpeg1Context *s1 = avctx->priv_data;
2129     MpegEncContext *s = &s1->mpeg_enc_ctx;
2130
2131     int time_code_hours, time_code_minutes;
2132     int time_code_seconds, time_code_pictures;
2133     int broken_link;
2134
2135     init_get_bits(&s->gb, buf, buf_size*8);
2136
2137     skip_bits1(&s->gb); /* drop_frame_flag */
2138
2139     time_code_hours=get_bits(&s->gb,5);
2140     time_code_minutes = get_bits(&s->gb,6);
2141     skip_bits1(&s->gb);//marker bit
2142     time_code_seconds = get_bits(&s->gb,6);
2143     time_code_pictures = get_bits(&s->gb,6);
2144
2145     s->closed_gop = get_bits1(&s->gb);
2146     /*broken_link indicate that after editing the
2147       reference frames of the first B-Frames after GOP I-Frame
2148       are missing (open gop)*/
2149     broken_link = get_bits1(&s->gb);
2150
2151     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2152         av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2153             time_code_hours, time_code_minutes, time_code_seconds,
2154             time_code_pictures, s->closed_gop, broken_link);
2155 }
2156 /**
2157  * Find the end of the current frame in the bitstream.
2158  * @return the position of the first byte of the next frame, or -1
2159  */
2160 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2161 {
2162     int i;
2163     uint32_t state= pc->state;
2164
2165     /* EOF considered as end of frame */
2166     if (buf_size == 0)
2167         return 0;
2168
2169 /*
2170  0  frame start         -> 1/4
2171  1  first_SEQEXT        -> 0/2
2172  2  first field start   -> 3/0
2173  3  second_SEQEXT       -> 2/0
2174  4  searching end
2175 */
2176
2177     for(i=0; i<buf_size; i++){
2178         assert(pc->frame_start_found>=0 && pc->frame_start_found<=4);
2179         if(pc->frame_start_found&1){
2180             if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80)
2181                 pc->frame_start_found--;
2182             else if(state == EXT_START_CODE+2){
2183                 if((buf[i]&3) == 3) pc->frame_start_found= 0;
2184                 else                pc->frame_start_found= (pc->frame_start_found+1)&3;
2185             }
2186             state++;
2187         }else{
2188             i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2189             if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2190                 i++;
2191                 pc->frame_start_found=4;
2192             }
2193             if(state == SEQ_END_CODE){
2194                 pc->state=-1;
2195                 return i+1;
2196             }
2197             if(pc->frame_start_found==2 && state == SEQ_START_CODE)
2198                 pc->frame_start_found= 0;
2199             if(pc->frame_start_found<4 && state == EXT_START_CODE)
2200                 pc->frame_start_found++;
2201             if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){
2202                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2203                     pc->frame_start_found=0;
2204                     pc->state=-1;
2205                     return i-3;
2206                 }
2207             }
2208             if(pc->frame_start_found == 0 && s && state == PICTURE_START_CODE){
2209                 ff_fetch_timestamp(s, i-3, 1);
2210             }
2211         }
2212     }
2213     pc->state= state;
2214     return END_NOT_FOUND;
2215 }
2216
2217 static int decode_chunks(AVCodecContext *avctx,
2218                              AVFrame *picture, int *data_size,
2219                              const uint8_t *buf, int buf_size);
2220
2221 /* handle buffering and image synchronisation */
2222 static int mpeg_decode_frame(AVCodecContext *avctx,
2223                              void *data, int *data_size,
2224                              AVPacket *avpkt)
2225 {
2226     const uint8_t *buf = avpkt->data;
2227     int buf_size = avpkt->size;
2228     Mpeg1Context *s = avctx->priv_data;
2229     AVFrame *picture = data;
2230     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2231     av_dlog(avctx, "fill_buffer\n");
2232
2233     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2234         /* special case for last picture */
2235         if (s2->low_delay==0 && s2->next_picture_ptr) {
2236             *picture= *(AVFrame*)s2->next_picture_ptr;
2237             s2->next_picture_ptr= NULL;
2238
2239             *data_size = sizeof(AVFrame);
2240         }
2241         return buf_size;
2242     }
2243
2244     if(s2->flags&CODEC_FLAG_TRUNCATED){
2245         int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2246
2247         if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2248             return buf_size;
2249     }
2250
2251 #if 0
2252     if (s->repeat_field % 2 == 1) {
2253         s->repeat_field++;
2254         //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2255         //        s2->picture_number, s->repeat_field);
2256         if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2257             *data_size = sizeof(AVPicture);
2258             goto the_end;
2259         }
2260     }
2261 #endif
2262
2263     if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == AV_RL32("VCR2"))
2264         vcr2_init_sequence(avctx);
2265
2266     s->slice_count= 0;
2267
2268     if(avctx->extradata && !avctx->frame_number)
2269         decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2270
2271     return decode_chunks(avctx, picture, data_size, buf, buf_size);
2272 }
2273
2274 static int decode_chunks(AVCodecContext *avctx,
2275                              AVFrame *picture, int *data_size,
2276                              const uint8_t *buf, int buf_size)
2277 {
2278     Mpeg1Context *s = avctx->priv_data;
2279     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2280     const uint8_t *buf_ptr = buf;
2281     const uint8_t *buf_end = buf + buf_size;
2282     int ret, input_size;
2283     int last_code= 0;
2284
2285     for(;;) {
2286         /* find next start code */
2287         uint32_t start_code = -1;
2288         buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2289         if (start_code > 0x1ff){
2290             if(s2->pict_type != AV_PICTURE_TYPE_B || avctx->skip_frame <= AVDISCARD_DEFAULT){
2291                 if(HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)){
2292                     int i;
2293
2294                     avctx->execute(avctx, slice_decode_thread,  &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
2295                     for(i=0; i<s->slice_count; i++)
2296                         s2->error_count += s2->thread_context[i]->error_count;
2297                 }
2298
2299                 if (CONFIG_MPEG_VDPAU_DECODER && avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)
2300                     ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2301
2302                 if (slice_end(avctx, picture)) {
2303                     if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2304                         *data_size = sizeof(AVPicture);
2305                 }
2306             }
2307             s2->pict_type= 0;
2308             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2309         }
2310
2311         input_size = buf_end - buf_ptr;
2312
2313         if(avctx->debug & FF_DEBUG_STARTCODE){
2314             av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2315         }
2316
2317         /* prepare data for next start code */
2318         switch(start_code) {
2319         case SEQ_START_CODE:
2320             if(last_code == 0){
2321             mpeg1_decode_sequence(avctx, buf_ptr,
2322                                     input_size);
2323                 s->sync=1;
2324             }else{
2325                 av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2326             }
2327             break;
2328
2329         case PICTURE_START_CODE:
2330             if (HAVE_THREADS && (avctx->active_thread_type&FF_THREAD_SLICE) && s->slice_count) {
2331                 int i;
2332
2333                 avctx->execute(avctx, slice_decode_thread,
2334                                s2->thread_context, NULL,
2335                                s->slice_count, sizeof(void*));
2336                 for (i = 0; i < s->slice_count; i++)
2337                     s2->error_count += s2->thread_context[i]->error_count;
2338                 s->slice_count = 0;
2339             }
2340             if(last_code == 0 || last_code == SLICE_MIN_START_CODE){
2341             if(mpeg_decode_postinit(avctx) < 0){
2342                 av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
2343                 return -1;
2344             }
2345
2346             /* we have a complete image: we try to decompress it */
2347             if(mpeg1_decode_picture(avctx,
2348                                     buf_ptr, input_size) < 0)
2349                 s2->pict_type=0;
2350                 s2->first_slice = 1;
2351             last_code= PICTURE_START_CODE;
2352             }else{
2353                 av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
2354             }
2355             break;
2356         case EXT_START_CODE:
2357             init_get_bits(&s2->gb, buf_ptr, input_size*8);
2358
2359             switch(get_bits(&s2->gb, 4)) {
2360             case 0x1:
2361                 if(last_code == 0){
2362                 mpeg_decode_sequence_extension(s);
2363                 }else{
2364                     av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
2365                 }
2366                 break;
2367             case 0x2:
2368                 mpeg_decode_sequence_display_extension(s);
2369                 break;
2370             case 0x3:
2371                 mpeg_decode_quant_matrix_extension(s2);
2372                 break;
2373             case 0x7:
2374                 mpeg_decode_picture_display_extension(s);
2375                 break;
2376             case 0x8:
2377                 if(last_code == PICTURE_START_CODE){
2378                 mpeg_decode_picture_coding_extension(s);
2379                 }else{
2380                     av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
2381                 }
2382                 break;
2383             }
2384             break;
2385         case USER_START_CODE:
2386             mpeg_decode_user_data(avctx,
2387                                     buf_ptr, input_size);
2388             break;
2389         case GOP_START_CODE:
2390             if(last_code == 0){
2391             s2->first_field=0;
2392             mpeg_decode_gop(avctx,
2393                                     buf_ptr, input_size);
2394                 s->sync=1;
2395             }else{
2396                 av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
2397             }
2398             break;
2399         default:
2400             if (start_code >= SLICE_MIN_START_CODE &&
2401                 start_code <= SLICE_MAX_START_CODE && last_code!=0) {
2402                 const int field_pic= s2->picture_structure != PICT_FRAME;
2403                 int mb_y= (start_code - SLICE_MIN_START_CODE) << field_pic;
2404                 last_code= SLICE_MIN_START_CODE;
2405
2406                 if(s2->picture_structure == PICT_BOTTOM_FIELD)
2407                     mb_y++;
2408
2409                 if (mb_y >= s2->mb_height){
2410                     av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2411                     return -1;
2412                 }
2413
2414                 if(s2->last_picture_ptr==NULL){
2415                 /* Skip B-frames if we do not have reference frames and gop is not closed */
2416                     if(s2->pict_type==AV_PICTURE_TYPE_B){
2417                         if(!s2->closed_gop)
2418                             break;
2419                     }
2420                 }
2421                 if(s2->pict_type==AV_PICTURE_TYPE_I)
2422                     s->sync=1;
2423                 if(s2->next_picture_ptr==NULL){
2424                 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2425                     if(s2->pict_type==AV_PICTURE_TYPE_P && !s->sync) break;
2426                 }
2427                 if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==AV_PICTURE_TYPE_B)
2428                     ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=AV_PICTURE_TYPE_I)
2429                     || avctx->skip_frame >= AVDISCARD_ALL)
2430                     break;
2431
2432                 if (!s->mpeg_enc_ctx_allocated) break;
2433
2434                 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2435                     if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2436                         break;
2437                 }
2438
2439                 if(!s2->pict_type){
2440                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2441                     break;
2442                 }
2443
2444                 if(s2->first_slice){
2445                     s2->first_slice=0;
2446                     if(mpeg_field_start(s2, buf, buf_size) < 0)
2447                         return -1;
2448                 }
2449                 if(!s2->current_picture_ptr){
2450                     av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2451                     return -1;
2452                 }
2453
2454                 if (avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU) {
2455                     s->slice_count++;
2456                     break;
2457                 }
2458
2459                 if(HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)){
2460                     int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2461                     if(threshold <= mb_y){
2462                         MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2463
2464                         thread_context->start_mb_y= mb_y;
2465                         thread_context->end_mb_y  = s2->mb_height;
2466                         if(s->slice_count){
2467                             s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2468                             ff_update_duplicate_context(thread_context, s2);
2469                         }
2470                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2471                         s->slice_count++;
2472                     }
2473                     buf_ptr += 2; //FIXME add minimum number of bytes per slice
2474                 }else{
2475                     ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2476                     emms_c();
2477
2478                     if(ret < 0){
2479                         if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2480                             ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
2481                     }else{
2482                         ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x-1, s2->mb_y, AC_END|DC_END|MV_END);
2483                     }
2484                 }
2485             }
2486             break;
2487         }
2488     }
2489 }
2490
2491 static void flush(AVCodecContext *avctx){
2492     Mpeg1Context *s = avctx->priv_data;
2493
2494     s->sync=0;
2495
2496     ff_mpeg_flush(avctx);
2497 }
2498
2499 static int mpeg_decode_end(AVCodecContext *avctx)
2500 {
2501     Mpeg1Context *s = avctx->priv_data;
2502
2503     if (s->mpeg_enc_ctx_allocated)
2504         MPV_common_end(&s->mpeg_enc_ctx);
2505     return 0;
2506 }
2507
2508 static const AVProfile mpeg2_video_profiles[] = {
2509     { FF_PROFILE_MPEG2_422,          "4:2:2"              },
2510     { FF_PROFILE_MPEG2_HIGH,         "High"               },
2511     { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
2512     { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
2513     { FF_PROFILE_MPEG2_MAIN,         "Main"               },
2514     { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
2515     { FF_PROFILE_RESERVED,           "Reserved"           },
2516     { FF_PROFILE_RESERVED,           "Reserved"           },
2517     { FF_PROFILE_UNKNOWN },
2518 };
2519
2520
2521 AVCodec ff_mpeg1video_decoder = {
2522     "mpeg1video",
2523     AVMEDIA_TYPE_VIDEO,
2524     CODEC_ID_MPEG1VIDEO,
2525     sizeof(Mpeg1Context),
2526     mpeg_decode_init,
2527     NULL,
2528     mpeg_decode_end,
2529     mpeg_decode_frame,
2530     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2531     .flush= flush,
2532     .max_lowres= 3,
2533     .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2534     .update_thread_context= ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2535 };
2536
2537 AVCodec ff_mpeg2video_decoder = {
2538     "mpeg2video",
2539     AVMEDIA_TYPE_VIDEO,
2540     CODEC_ID_MPEG2VIDEO,
2541     sizeof(Mpeg1Context),
2542     mpeg_decode_init,
2543     NULL,
2544     mpeg_decode_end,
2545     mpeg_decode_frame,
2546     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2547     .flush= flush,
2548     .max_lowres= 3,
2549     .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2550     .profiles = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2551 };
2552
2553 //legacy decoder
2554 AVCodec ff_mpegvideo_decoder = {
2555     "mpegvideo",
2556     AVMEDIA_TYPE_VIDEO,
2557     CODEC_ID_MPEG2VIDEO,
2558     sizeof(Mpeg1Context),
2559     mpeg_decode_init,
2560     NULL,
2561     mpeg_decode_end,
2562     mpeg_decode_frame,
2563     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2564     .flush= flush,
2565     .max_lowres= 3,
2566     .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2567 };
2568
2569 #if CONFIG_MPEG_XVMC_DECODER
2570 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx){
2571     if( avctx->active_thread_type & FF_THREAD_SLICE )
2572         return -1;
2573     if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2574         return -1;
2575     if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2576         av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2577     }
2578     mpeg_decode_init(avctx);
2579
2580     avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2581     avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2582
2583     return 0;
2584 }
2585
2586 AVCodec ff_mpeg_xvmc_decoder = {
2587     "mpegvideo_xvmc",
2588     AVMEDIA_TYPE_VIDEO,
2589     CODEC_ID_MPEG2VIDEO_XVMC,
2590     sizeof(Mpeg1Context),
2591     mpeg_mc_decode_init,
2592     NULL,
2593     mpeg_decode_end,
2594     mpeg_decode_frame,
2595     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2596     .flush= flush,
2597     .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2598 };
2599
2600 #endif
2601
2602 #if CONFIG_MPEG_VDPAU_DECODER
2603 AVCodec ff_mpeg_vdpau_decoder = {
2604     "mpegvideo_vdpau",
2605     AVMEDIA_TYPE_VIDEO,
2606     CODEC_ID_MPEG2VIDEO,
2607     sizeof(Mpeg1Context),
2608     mpeg_decode_init,
2609     NULL,
2610     mpeg_decode_end,
2611     mpeg_decode_frame,
2612     CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2613     .flush= flush,
2614     .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2615 };
2616 #endif
2617
2618 #if CONFIG_MPEG1_VDPAU_DECODER
2619 AVCodec ff_mpeg1_vdpau_decoder = {
2620     "mpeg1video_vdpau",
2621     AVMEDIA_TYPE_VIDEO,
2622     CODEC_ID_MPEG1VIDEO,
2623     sizeof(Mpeg1Context),
2624     mpeg_decode_init,
2625     NULL,
2626     mpeg_decode_end,
2627     mpeg_decode_frame,
2628     CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2629     .flush= flush,
2630     .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2631 };
2632 #endif
2633