merge/simplify 2 if()
[ffmpeg.git] / libavcodec / mpeg12.c
1 /*
2  * MPEG1/2 decoder
3  * Copyright (c) 2000,2001 Fabrice Bellard.
4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22
23 /**
24  * @file mpeg12.c
25  * MPEG1/2 decoder
26  */
27
28 //#define DEBUG
29 #include "avcodec.h"
30 #include "dsputil.h"
31 #include "mpegvideo.h"
32
33 #include "mpeg12.h"
34 #include "mpeg12data.h"
35 #include "mpeg12decdata.h"
36 #include "bytestream.h"
37
38 //#undef NDEBUG
39 //#include <assert.h>
40
41
42 #define DC_VLC_BITS 9
43 #define MV_VLC_BITS 9
44 #define MBINCR_VLC_BITS 9
45 #define MB_PAT_VLC_BITS 9
46 #define MB_PTYPE_VLC_BITS 6
47 #define MB_BTYPE_VLC_BITS 6
48 #define TEX_VLC_BITS 9
49
50 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
51                               DCTELEM *block,
52                               int n);
53 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
54                               DCTELEM *block,
55                               int n);
56 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
57 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
58                                         DCTELEM *block,
59                                         int n);
60 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
61                                     DCTELEM *block,
62                                     int n);
63 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
64 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
65 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
66 static void exchange_uv(MpegEncContext *s);
67
68 extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
69 extern int XVMC_field_end(MpegEncContext *s);
70 extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
71 extern void XVMC_init_block(MpegEncContext *s);//set s->block
72
73 static const enum PixelFormat pixfmt_yuv_420[]= {PIX_FMT_YUV420P,-1};
74 static const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,-1};
75 static const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,-1};
76 static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
77                                            PIX_FMT_XVMC_MPEG2_IDCT,
78                                            PIX_FMT_XVMC_MPEG2_MC,
79                                            -1};
80
81 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
82
83 static void init_2d_vlc_rl(RLTable *rl, int use_static)
84 {
85     int i;
86
87     init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2,
88              &rl->table_vlc[0][1], 4, 2,
89              &rl->table_vlc[0][0], 4, 2, use_static);
90
91     if(use_static)
92         rl->rl_vlc[0]= av_mallocz_static(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
93     else
94         rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
95
96     for(i=0; i<rl->vlc.table_size; i++){
97         int code= rl->vlc.table[i][0];
98         int len = rl->vlc.table[i][1];
99         int level, run;
100
101         if(len==0){ // illegal code
102             run= 65;
103             level= MAX_LEVEL;
104         }else if(len<0){ //more bits needed
105             run= 0;
106             level= code;
107         }else{
108             if(code==rl->n){ //esc
109                 run= 65;
110                 level= 0;
111             }else if(code==rl->n+1){ //eob
112                 run= 0;
113                 level= 127;
114             }else{
115                 run=   rl->table_run  [code] + 1;
116                 level= rl->table_level[code];
117             }
118         }
119         rl->rl_vlc[0][i].len= len;
120         rl->rl_vlc[0][i].level= level;
121         rl->rl_vlc[0][i].run= run;
122     }
123 }
124
125 void ff_mpeg12_common_init(MpegEncContext *s)
126 {
127
128     s->y_dc_scale_table=
129     s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
130
131 }
132
133 void ff_mpeg1_clean_buffers(MpegEncContext *s){
134     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
135     s->last_dc[1] = s->last_dc[0];
136     s->last_dc[2] = s->last_dc[0];
137     memset(s->last_mv, 0, sizeof(s->last_mv));
138 }
139
140
141 /******************************************/
142 /* decoding */
143
144 static VLC dc_lum_vlc;
145 static VLC dc_chroma_vlc;
146 static VLC mv_vlc;
147 static VLC mbincr_vlc;
148 static VLC mb_ptype_vlc;
149 static VLC mb_btype_vlc;
150 static VLC mb_pat_vlc;
151
152 static void init_vlcs(void)
153 {
154     static int done = 0;
155
156     if (!done) {
157         done = 1;
158
159         init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
160                  ff_mpeg12_vlc_dc_lum_bits, 1, 1,
161                  ff_mpeg12_vlc_dc_lum_code, 2, 2, 1);
162         init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12,
163                  ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
164                  ff_mpeg12_vlc_dc_chroma_code, 2, 2, 1);
165         init_vlc(&mv_vlc, MV_VLC_BITS, 17,
166                  &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
167                  &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 1);
168         init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
169                  &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
170                  &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 1);
171         init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
172                  &ff_mpeg12_mbPatTable[0][1], 2, 1,
173                  &ff_mpeg12_mbPatTable[0][0], 2, 1, 1);
174
175         init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
176                  &table_mb_ptype[0][1], 2, 1,
177                  &table_mb_ptype[0][0], 2, 1, 1);
178         init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
179                  &table_mb_btype[0][1], 2, 1,
180                  &table_mb_btype[0][0], 2, 1, 1);
181         init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
182         init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
183
184         init_2d_vlc_rl(&ff_rl_mpeg1, 1);
185         init_2d_vlc_rl(&ff_rl_mpeg2, 1);
186     }
187 }
188
189 static inline int get_dmv(MpegEncContext *s)
190 {
191     if(get_bits1(&s->gb))
192         return 1 - (get_bits1(&s->gb) << 1);
193     else
194         return 0;
195 }
196
197 static inline int get_qscale(MpegEncContext *s)
198 {
199     int qscale = get_bits(&s->gb, 5);
200     if (s->q_scale_type) {
201         return non_linear_qscale[qscale];
202     } else {
203         return qscale << 1;
204     }
205 }
206
207 /* motion type (for mpeg2) */
208 #define MT_FIELD 1
209 #define MT_FRAME 2
210 #define MT_16X8  2
211 #define MT_DMV   3
212
213 static int mpeg_decode_mb(MpegEncContext *s,
214                           DCTELEM block[12][64])
215 {
216     int i, j, k, cbp, val, mb_type, motion_type;
217     const int mb_block_count = 4 + (1<< s->chroma_format);
218
219     dprintf(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
220
221     assert(s->mb_skipped==0);
222
223     if (s->mb_skip_run-- != 0) {
224         if (s->pict_type == P_TYPE) {
225             s->mb_skipped = 1;
226             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
227         } else {
228             int mb_type;
229
230             if(s->mb_x)
231                 mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
232             else
233                 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,
234             if(IS_INTRA(mb_type))
235                 return -1;
236
237             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
238                 mb_type | MB_TYPE_SKIP;
239 //            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
240
241             if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
242                 s->mb_skipped = 1;
243         }
244
245         return 0;
246     }
247
248     switch(s->pict_type) {
249     default:
250     case I_TYPE:
251         if (get_bits1(&s->gb) == 0) {
252             if (get_bits1(&s->gb) == 0){
253                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
254                 return -1;
255             }
256             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
257         } else {
258             mb_type = MB_TYPE_INTRA;
259         }
260         break;
261     case P_TYPE:
262         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
263         if (mb_type < 0){
264             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
265             return -1;
266         }
267         mb_type = ptype2mb_type[ mb_type ];
268         break;
269     case B_TYPE:
270         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
271         if (mb_type < 0){
272             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
273             return -1;
274         }
275         mb_type = btype2mb_type[ mb_type ];
276         break;
277     }
278     dprintf(s->avctx, "mb_type=%x\n", mb_type);
279 //    motion_type = 0; /* avoid warning */
280     if (IS_INTRA(mb_type)) {
281         s->dsp.clear_blocks(s->block[0]);
282
283         if(!s->chroma_y_shift){
284             s->dsp.clear_blocks(s->block[6]);
285         }
286
287         /* compute dct type */
288         if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
289             !s->frame_pred_frame_dct) {
290             s->interlaced_dct = get_bits1(&s->gb);
291         }
292
293         if (IS_QUANT(mb_type))
294             s->qscale = get_qscale(s);
295
296         if (s->concealment_motion_vectors) {
297             /* just parse them */
298             if (s->picture_structure != PICT_FRAME)
299                 skip_bits1(&s->gb); /* field select */
300
301             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
302                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
303             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
304                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
305
306             skip_bits1(&s->gb); /* marker */
307         }else
308             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
309         s->mb_intra = 1;
310 #ifdef HAVE_XVMC
311         //one 1 we memcpy blocks in xvmcvideo
312         if(s->avctx->xvmc_acceleration > 1){
313             XVMC_pack_pblocks(s,-1);//inter are always full blocks
314             if(s->swap_uv){
315                 exchange_uv(s);
316             }
317         }
318 #endif
319
320         if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
321             if(s->flags2 & CODEC_FLAG2_FAST){
322                 for(i=0;i<6;i++) {
323                     mpeg2_fast_decode_block_intra(s, s->pblocks[i], i);
324                 }
325             }else{
326                 for(i=0;i<mb_block_count;i++) {
327                     if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
328                         return -1;
329                 }
330             }
331         } else {
332             for(i=0;i<6;i++) {
333                 if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
334                     return -1;
335             }
336         }
337     } else {
338         if (mb_type & MB_TYPE_ZERO_MV){
339             assert(mb_type & MB_TYPE_CBP);
340
341             s->mv_dir = MV_DIR_FORWARD;
342             if(s->picture_structure == PICT_FRAME){
343                 if(!s->frame_pred_frame_dct)
344                     s->interlaced_dct = get_bits1(&s->gb);
345                 s->mv_type = MV_TYPE_16X16;
346             }else{
347                 s->mv_type = MV_TYPE_FIELD;
348                 mb_type |= MB_TYPE_INTERLACED;
349                 s->field_select[0][0]= s->picture_structure - 1;
350             }
351
352             if (IS_QUANT(mb_type))
353                 s->qscale = get_qscale(s);
354
355             s->last_mv[0][0][0] = 0;
356             s->last_mv[0][0][1] = 0;
357             s->last_mv[0][1][0] = 0;
358             s->last_mv[0][1][1] = 0;
359             s->mv[0][0][0] = 0;
360             s->mv[0][0][1] = 0;
361         }else{
362             assert(mb_type & MB_TYPE_L0L1);
363 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
364             /* get additional motion vector type */
365             if (s->frame_pred_frame_dct)
366                 motion_type = MT_FRAME;
367             else{
368                 motion_type = get_bits(&s->gb, 2);
369                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
370                     s->interlaced_dct = get_bits1(&s->gb);
371             }
372
373             if (IS_QUANT(mb_type))
374                 s->qscale = get_qscale(s);
375
376             /* motion vectors */
377             s->mv_dir = 0;
378             for(i=0;i<2;i++) {
379                 if (USES_LIST(mb_type, i)) {
380                     s->mv_dir |= (MV_DIR_FORWARD >> i);
381                     dprintf(s->avctx, "motion_type=%d\n", motion_type);
382                     switch(motion_type) {
383                     case MT_FRAME: /* or MT_16X8 */
384                         if (s->picture_structure == PICT_FRAME) {
385                             /* MT_FRAME */
386                             mb_type |= MB_TYPE_16x16;
387                             s->mv_type = MV_TYPE_16X16;
388                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
389                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
390                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
391                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
392                             /* full_pel: only for mpeg1 */
393                             if (s->full_pel[i]){
394                                 s->mv[i][0][0] <<= 1;
395                                 s->mv[i][0][1] <<= 1;
396                             }
397                         } else {
398                             /* MT_16X8 */
399                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
400                             s->mv_type = MV_TYPE_16X8;
401                             for(j=0;j<2;j++) {
402                                 s->field_select[i][j] = get_bits1(&s->gb);
403                                 for(k=0;k<2;k++) {
404                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
405                                                              s->last_mv[i][j][k]);
406                                     s->last_mv[i][j][k] = val;
407                                     s->mv[i][j][k] = val;
408                                 }
409                             }
410                         }
411                         break;
412                     case MT_FIELD:
413                         s->mv_type = MV_TYPE_FIELD;
414                         if (s->picture_structure == PICT_FRAME) {
415                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
416                             for(j=0;j<2;j++) {
417                                 s->field_select[i][j] = get_bits1(&s->gb);
418                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
419                                                          s->last_mv[i][j][0]);
420                                 s->last_mv[i][j][0] = val;
421                                 s->mv[i][j][0] = val;
422                                 dprintf(s->avctx, "fmx=%d\n", val);
423                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
424                                                          s->last_mv[i][j][1] >> 1);
425                                 s->last_mv[i][j][1] = val << 1;
426                                 s->mv[i][j][1] = val;
427                                 dprintf(s->avctx, "fmy=%d\n", val);
428                             }
429                         } else {
430                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
431                             s->field_select[i][0] = get_bits1(&s->gb);
432                             for(k=0;k<2;k++) {
433                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
434                                                          s->last_mv[i][0][k]);
435                                 s->last_mv[i][0][k] = val;
436                                 s->last_mv[i][1][k] = val;
437                                 s->mv[i][0][k] = val;
438                             }
439                         }
440                         break;
441                     case MT_DMV:
442                         {
443                             int dmx, dmy, mx, my, m;
444
445                             mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
446                                                     s->last_mv[i][0][0]);
447                             s->last_mv[i][0][0] = mx;
448                             s->last_mv[i][1][0] = mx;
449                             dmx = get_dmv(s);
450                             my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
451                                                     s->last_mv[i][0][1] >> 1);
452                             dmy = get_dmv(s);
453                             s->mv_type = MV_TYPE_DMV;
454
455
456                             s->last_mv[i][0][1] = my<<1;
457                             s->last_mv[i][1][1] = my<<1;
458
459                             s->mv[i][0][0] = mx;
460                             s->mv[i][0][1] = my;
461                             s->mv[i][1][0] = mx;//not used
462                             s->mv[i][1][1] = my;//not used
463
464                             if (s->picture_structure == PICT_FRAME) {
465                                 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
466
467                                 //m = 1 + 2 * s->top_field_first;
468                                 m = s->top_field_first ? 1 : 3;
469
470                                 /* top -> top pred */
471                                 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
472                                 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
473                                 m = 4 - m;
474                                 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
475                                 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
476                             } else {
477                                 mb_type |= MB_TYPE_16x16;
478
479                                 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
480                                 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
481                                 if(s->picture_structure == PICT_TOP_FIELD)
482                                     s->mv[i][2][1]--;
483                                 else
484                                     s->mv[i][2][1]++;
485                             }
486                         }
487                         break;
488                     default:
489                         av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
490                         return -1;
491                     }
492                 }
493             }
494         }
495
496         s->mb_intra = 0;
497         if (HAS_CBP(mb_type)) {
498             s->dsp.clear_blocks(s->block[0]);
499
500             if(!s->chroma_y_shift){
501                 s->dsp.clear_blocks(s->block[6]);
502             }
503
504             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
505             if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){
506                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
507                 return -1;
508             }
509             if(mb_block_count > 6){
510                  cbp<<= mb_block_count-6;
511                  cbp |= get_bits(&s->gb, mb_block_count-6);
512             }
513
514 #ifdef HAVE_XVMC
515             //on 1 we memcpy blocks in xvmcvideo
516             if(s->avctx->xvmc_acceleration > 1){
517                 XVMC_pack_pblocks(s,cbp);
518                 if(s->swap_uv){
519                     exchange_uv(s);
520                 }
521             }
522 #endif
523
524             if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
525                 if(s->flags2 & CODEC_FLAG2_FAST){
526                     for(i=0;i<6;i++) {
527                         if(cbp & 32) {
528                             mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
529                         } else {
530                             s->block_last_index[i] = -1;
531                         }
532                         cbp+=cbp;
533                     }
534                 }else{
535                     cbp<<= 12-mb_block_count;
536
537                     for(i=0;i<mb_block_count;i++) {
538                         if ( cbp & (1<<11) ) {
539                             if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
540                                 return -1;
541                         } else {
542                             s->block_last_index[i] = -1;
543                         }
544                         cbp+=cbp;
545                     }
546                 }
547             } else {
548                 if(s->flags2 & CODEC_FLAG2_FAST){
549                     for(i=0;i<6;i++) {
550                         if (cbp & 32) {
551                             mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
552                         } else {
553                             s->block_last_index[i] = -1;
554                         }
555                         cbp+=cbp;
556                     }
557                 }else{
558                     for(i=0;i<6;i++) {
559                         if (cbp & 32) {
560                             if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
561                                 return -1;
562                         } else {
563                             s->block_last_index[i] = -1;
564                         }
565                         cbp+=cbp;
566                     }
567                 }
568             }
569         }else{
570             for(i=0;i<12;i++)
571                 s->block_last_index[i] = -1;
572         }
573     }
574
575     s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
576
577     return 0;
578 }
579
580 /* as h263, but only 17 codes */
581 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
582 {
583     int code, sign, val, l, shift;
584
585     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
586     if (code == 0) {
587         return pred;
588     }
589     if (code < 0) {
590         return 0xffff;
591     }
592
593     sign = get_bits1(&s->gb);
594     shift = fcode - 1;
595     val = code;
596     if (shift) {
597         val = (val - 1) << shift;
598         val |= get_bits(&s->gb, shift);
599         val++;
600     }
601     if (sign)
602         val = -val;
603     val += pred;
604
605     /* modulo decoding */
606     l= INT_BIT - 5 - shift;
607     val = (val<<l)>>l;
608     return val;
609 }
610
611 static inline int decode_dc(GetBitContext *gb, int component)
612 {
613     int code, diff;
614
615     if (component == 0) {
616         code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
617     } else {
618         code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
619     }
620     if (code < 0){
621         av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
622         return 0xffff;
623     }
624     if (code == 0) {
625         diff = 0;
626     } else {
627         diff = get_xbits(gb, code);
628     }
629     return diff;
630 }
631
632 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
633                                DCTELEM *block,
634                                int n)
635 {
636     int level, dc, diff, i, j, run;
637     int component;
638     RLTable *rl = &ff_rl_mpeg1;
639     uint8_t * const scantable= s->intra_scantable.permutated;
640     const uint16_t *quant_matrix= s->intra_matrix;
641     const int qscale= s->qscale;
642
643     /* DC coef */
644     component = (n <= 3 ? 0 : n - 4 + 1);
645     diff = decode_dc(&s->gb, component);
646     if (diff >= 0xffff)
647         return -1;
648     dc = s->last_dc[component];
649     dc += diff;
650     s->last_dc[component] = dc;
651     block[0] = dc<<3;
652     dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
653     i = 0;
654     {
655         OPEN_READER(re, &s->gb);
656         /* now quantify & encode AC coefs */
657         for(;;) {
658             UPDATE_CACHE(re, &s->gb);
659             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
660
661             if(level == 127){
662                 break;
663             } else if(level != 0) {
664                 i += run;
665                 j = scantable[i];
666                 level= (level*qscale*quant_matrix[j])>>4;
667                 level= (level-1)|1;
668                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
669                 LAST_SKIP_BITS(re, &s->gb, 1);
670             } else {
671                 /* escape */
672                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
673                 UPDATE_CACHE(re, &s->gb);
674                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
675                 if (level == -128) {
676                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
677                 } else if (level == 0) {
678                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
679                 }
680                 i += run;
681                 j = scantable[i];
682                 if(level<0){
683                     level= -level;
684                     level= (level*qscale*quant_matrix[j])>>4;
685                     level= (level-1)|1;
686                     level= -level;
687                 }else{
688                     level= (level*qscale*quant_matrix[j])>>4;
689                     level= (level-1)|1;
690                 }
691             }
692             if (i > 63){
693                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
694                 return -1;
695             }
696
697             block[j] = level;
698         }
699         CLOSE_READER(re, &s->gb);
700     }
701     s->block_last_index[n] = i;
702    return 0;
703 }
704
705 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
706                                DCTELEM *block,
707                                int n)
708 {
709     int level, i, j, run;
710     RLTable *rl = &ff_rl_mpeg1;
711     uint8_t * const scantable= s->intra_scantable.permutated;
712     const uint16_t *quant_matrix= s->inter_matrix;
713     const int qscale= s->qscale;
714
715     {
716         OPEN_READER(re, &s->gb);
717         i = -1;
718         /* special case for the first coef. no need to add a second vlc table */
719         UPDATE_CACHE(re, &s->gb);
720         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
721             level= (3*qscale*quant_matrix[0])>>5;
722             level= (level-1)|1;
723             if(GET_CACHE(re, &s->gb)&0x40000000)
724                 level= -level;
725             block[0] = level;
726             i++;
727             SKIP_BITS(re, &s->gb, 2);
728             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
729                 goto end;
730         }
731
732         /* now quantify & encode AC coefs */
733         for(;;) {
734             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
735
736             if(level != 0) {
737                 i += run;
738                 j = scantable[i];
739                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
740                 level= (level-1)|1;
741                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
742                 SKIP_BITS(re, &s->gb, 1);
743             } else {
744                 /* escape */
745                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
746                 UPDATE_CACHE(re, &s->gb);
747                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
748                 if (level == -128) {
749                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
750                 } else if (level == 0) {
751                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
752                 }
753                 i += run;
754                 j = scantable[i];
755                 if(level<0){
756                     level= -level;
757                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
758                     level= (level-1)|1;
759                     level= -level;
760                 }else{
761                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
762                     level= (level-1)|1;
763                 }
764             }
765             if (i > 63){
766                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
767                 return -1;
768             }
769
770             block[j] = level;
771             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
772                 break;
773             UPDATE_CACHE(re, &s->gb);
774         }
775 end:
776         LAST_SKIP_BITS(re, &s->gb, 2);
777         CLOSE_READER(re, &s->gb);
778     }
779     s->block_last_index[n] = i;
780     return 0;
781 }
782
783 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
784 {
785     int level, i, j, run;
786     RLTable *rl = &ff_rl_mpeg1;
787     uint8_t * const scantable= s->intra_scantable.permutated;
788     const int qscale= s->qscale;
789
790     {
791         OPEN_READER(re, &s->gb);
792         i = -1;
793         /* special case for the first coef. no need to add a second vlc table */
794         UPDATE_CACHE(re, &s->gb);
795         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
796             level= (3*qscale)>>1;
797             level= (level-1)|1;
798             if(GET_CACHE(re, &s->gb)&0x40000000)
799                 level= -level;
800             block[0] = level;
801             i++;
802             SKIP_BITS(re, &s->gb, 2);
803             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
804                 goto end;
805         }
806
807         /* now quantify & encode AC coefs */
808         for(;;) {
809             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
810
811             if(level != 0) {
812                 i += run;
813                 j = scantable[i];
814                 level= ((level*2+1)*qscale)>>1;
815                 level= (level-1)|1;
816                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
817                 SKIP_BITS(re, &s->gb, 1);
818             } else {
819                 /* escape */
820                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
821                 UPDATE_CACHE(re, &s->gb);
822                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
823                 if (level == -128) {
824                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
825                 } else if (level == 0) {
826                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
827                 }
828                 i += run;
829                 j = scantable[i];
830                 if(level<0){
831                     level= -level;
832                     level= ((level*2+1)*qscale)>>1;
833                     level= (level-1)|1;
834                     level= -level;
835                 }else{
836                     level= ((level*2+1)*qscale)>>1;
837                     level= (level-1)|1;
838                 }
839             }
840
841             block[j] = level;
842             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
843                 break;
844             UPDATE_CACHE(re, &s->gb);
845         }
846 end:
847         LAST_SKIP_BITS(re, &s->gb, 2);
848         CLOSE_READER(re, &s->gb);
849     }
850     s->block_last_index[n] = i;
851     return 0;
852 }
853
854
855 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
856                                DCTELEM *block,
857                                int n)
858 {
859     int level, i, j, run;
860     RLTable *rl = &ff_rl_mpeg1;
861     uint8_t * const scantable= s->intra_scantable.permutated;
862     const uint16_t *quant_matrix;
863     const int qscale= s->qscale;
864     int mismatch;
865
866     mismatch = 1;
867
868     {
869         OPEN_READER(re, &s->gb);
870         i = -1;
871         if (n < 4)
872             quant_matrix = s->inter_matrix;
873         else
874             quant_matrix = s->chroma_inter_matrix;
875
876         /* special case for the first coef. no need to add a second vlc table */
877         UPDATE_CACHE(re, &s->gb);
878         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
879             level= (3*qscale*quant_matrix[0])>>5;
880             if(GET_CACHE(re, &s->gb)&0x40000000)
881                 level= -level;
882             block[0] = level;
883             mismatch ^= level;
884             i++;
885             SKIP_BITS(re, &s->gb, 2);
886             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
887                 goto end;
888         }
889
890         /* now quantify & encode AC coefs */
891         for(;;) {
892             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
893
894             if(level != 0) {
895                 i += run;
896                 j = scantable[i];
897                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
898                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
899                 SKIP_BITS(re, &s->gb, 1);
900             } else {
901                 /* escape */
902                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
903                 UPDATE_CACHE(re, &s->gb);
904                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
905
906                 i += run;
907                 j = scantable[i];
908                 if(level<0){
909                     level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
910                     level= -level;
911                 }else{
912                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
913                 }
914             }
915             if (i > 63){
916                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
917                 return -1;
918             }
919
920             mismatch ^= level;
921             block[j] = level;
922             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
923                 break;
924             UPDATE_CACHE(re, &s->gb);
925         }
926 end:
927         LAST_SKIP_BITS(re, &s->gb, 2);
928         CLOSE_READER(re, &s->gb);
929     }
930     block[63] ^= (mismatch & 1);
931
932     s->block_last_index[n] = i;
933     return 0;
934 }
935
936 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
937                                DCTELEM *block,
938                                int n)
939 {
940     int level, i, j, run;
941     RLTable *rl = &ff_rl_mpeg1;
942     uint8_t * const scantable= s->intra_scantable.permutated;
943     const int qscale= s->qscale;
944     OPEN_READER(re, &s->gb);
945     i = -1;
946
947     /* special case for the first coef. no need to add a second vlc table */
948     UPDATE_CACHE(re, &s->gb);
949     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
950         level= (3*qscale)>>1;
951         if(GET_CACHE(re, &s->gb)&0x40000000)
952             level= -level;
953         block[0] = level;
954         i++;
955         SKIP_BITS(re, &s->gb, 2);
956         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
957             goto end;
958     }
959
960     /* now quantify & encode AC coefs */
961     for(;;) {
962         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
963
964         if(level != 0) {
965             i += run;
966             j = scantable[i];
967             level= ((level*2+1)*qscale)>>1;
968             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
969             SKIP_BITS(re, &s->gb, 1);
970         } else {
971             /* escape */
972             run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
973             UPDATE_CACHE(re, &s->gb);
974             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
975
976             i += run;
977             j = scantable[i];
978             if(level<0){
979                 level= ((-level*2+1)*qscale)>>1;
980                 level= -level;
981             }else{
982                 level= ((level*2+1)*qscale)>>1;
983             }
984         }
985
986         block[j] = level;
987         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
988             break;
989         UPDATE_CACHE(re, &s->gb);
990     }
991 end:
992     LAST_SKIP_BITS(re, &s->gb, 2);
993     CLOSE_READER(re, &s->gb);
994     s->block_last_index[n] = i;
995     return 0;
996 }
997
998
999 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1000                                DCTELEM *block,
1001                                int n)
1002 {
1003     int level, dc, diff, i, j, run;
1004     int component;
1005     RLTable *rl;
1006     uint8_t * const scantable= s->intra_scantable.permutated;
1007     const uint16_t *quant_matrix;
1008     const int qscale= s->qscale;
1009     int mismatch;
1010
1011     /* DC coef */
1012     if (n < 4){
1013         quant_matrix = s->intra_matrix;
1014         component = 0;
1015     }else{
1016         quant_matrix = s->chroma_intra_matrix;
1017         component = (n&1) + 1;
1018     }
1019     diff = decode_dc(&s->gb, component);
1020     if (diff >= 0xffff)
1021         return -1;
1022     dc = s->last_dc[component];
1023     dc += diff;
1024     s->last_dc[component] = dc;
1025     block[0] = dc << (3 - s->intra_dc_precision);
1026     dprintf(s->avctx, "dc=%d\n", block[0]);
1027     mismatch = block[0] ^ 1;
1028     i = 0;
1029     if (s->intra_vlc_format)
1030         rl = &ff_rl_mpeg2;
1031     else
1032         rl = &ff_rl_mpeg1;
1033
1034     {
1035         OPEN_READER(re, &s->gb);
1036         /* now quantify & encode AC coefs */
1037         for(;;) {
1038             UPDATE_CACHE(re, &s->gb);
1039             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1040
1041             if(level == 127){
1042                 break;
1043             } else if(level != 0) {
1044                 i += run;
1045                 j = scantable[i];
1046                 level= (level*qscale*quant_matrix[j])>>4;
1047                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1048                 LAST_SKIP_BITS(re, &s->gb, 1);
1049             } else {
1050                 /* escape */
1051                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1052                 UPDATE_CACHE(re, &s->gb);
1053                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1054                 i += run;
1055                 j = scantable[i];
1056                 if(level<0){
1057                     level= (-level*qscale*quant_matrix[j])>>4;
1058                     level= -level;
1059                 }else{
1060                     level= (level*qscale*quant_matrix[j])>>4;
1061                 }
1062             }
1063             if (i > 63){
1064                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1065                 return -1;
1066             }
1067
1068             mismatch^= level;
1069             block[j] = level;
1070         }
1071         CLOSE_READER(re, &s->gb);
1072     }
1073     block[63]^= mismatch&1;
1074
1075     s->block_last_index[n] = i;
1076     return 0;
1077 }
1078
1079 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1080                                DCTELEM *block,
1081                                int n)
1082 {
1083     int level, dc, diff, j, run;
1084     int component;
1085     RLTable *rl;
1086     uint8_t * scantable= s->intra_scantable.permutated;
1087     const uint16_t *quant_matrix;
1088     const int qscale= s->qscale;
1089
1090     /* DC coef */
1091     if (n < 4){
1092         quant_matrix = s->intra_matrix;
1093         component = 0;
1094     }else{
1095         quant_matrix = s->chroma_intra_matrix;
1096         component = (n&1) + 1;
1097     }
1098     diff = decode_dc(&s->gb, component);
1099     if (diff >= 0xffff)
1100         return -1;
1101     dc = s->last_dc[component];
1102     dc += diff;
1103     s->last_dc[component] = dc;
1104     block[0] = dc << (3 - s->intra_dc_precision);
1105     if (s->intra_vlc_format)
1106         rl = &ff_rl_mpeg2;
1107     else
1108         rl = &ff_rl_mpeg1;
1109
1110     {
1111         OPEN_READER(re, &s->gb);
1112         /* now quantify & encode AC coefs */
1113         for(;;) {
1114             UPDATE_CACHE(re, &s->gb);
1115             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1116
1117             if(level == 127){
1118                 break;
1119             } else if(level != 0) {
1120                 scantable += run;
1121                 j = *scantable;
1122                 level= (level*qscale*quant_matrix[j])>>4;
1123                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1124                 LAST_SKIP_BITS(re, &s->gb, 1);
1125             } else {
1126                 /* escape */
1127                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1128                 UPDATE_CACHE(re, &s->gb);
1129                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1130                 scantable += run;
1131                 j = *scantable;
1132                 if(level<0){
1133                     level= (-level*qscale*quant_matrix[j])>>4;
1134                     level= -level;
1135                 }else{
1136                     level= (level*qscale*quant_matrix[j])>>4;
1137                 }
1138             }
1139
1140             block[j] = level;
1141         }
1142         CLOSE_READER(re, &s->gb);
1143     }
1144
1145     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1146     return 0;
1147 }
1148
1149 typedef struct Mpeg1Context {
1150     MpegEncContext mpeg_enc_ctx;
1151     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1152     int repeat_field; /* true if we must repeat the field */
1153     AVPanScan pan_scan; /** some temporary storage for the panscan */
1154     int slice_count;
1155     int swap_uv;//indicate VCR2
1156     int save_aspect_info;
1157     int save_width, save_height;
1158     AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
1159
1160 } Mpeg1Context;
1161
1162 static int mpeg_decode_init(AVCodecContext *avctx)
1163 {
1164     Mpeg1Context *s = avctx->priv_data;
1165     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1166     int i;
1167
1168     //we need some parmutation to store
1169     //matrixes, until MPV_common_init()
1170     //set the real permutatuon
1171     for(i=0;i<64;i++)
1172        s2->dsp.idct_permutation[i]=i;
1173
1174     MPV_decode_defaults(s2);
1175
1176     s->mpeg_enc_ctx.avctx= avctx;
1177     s->mpeg_enc_ctx.flags= avctx->flags;
1178     s->mpeg_enc_ctx.flags2= avctx->flags2;
1179     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1180     init_vlcs();
1181
1182     s->mpeg_enc_ctx_allocated = 0;
1183     s->mpeg_enc_ctx.picture_number = 0;
1184     s->repeat_field = 0;
1185     s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1186     return 0;
1187 }
1188
1189 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1190                                      const uint8_t *new_perm){
1191     uint16_t temp_matrix[64];
1192     int i;
1193
1194     memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1195
1196     for(i=0;i<64;i++){
1197         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1198     }
1199 }
1200
1201 //Call this function when we know all parameters
1202 //it may be called in different places for mpeg1 and mpeg2
1203 static int mpeg_decode_postinit(AVCodecContext *avctx){
1204     Mpeg1Context *s1 = avctx->priv_data;
1205     MpegEncContext *s = &s1->mpeg_enc_ctx;
1206     uint8_t old_permutation[64];
1207
1208     if (
1209         (s1->mpeg_enc_ctx_allocated == 0)||
1210         avctx->coded_width  != s->width ||
1211         avctx->coded_height != s->height||
1212         s1->save_width != s->width ||
1213         s1->save_height != s->height ||
1214         s1->save_aspect_info != s->aspect_ratio_info||
1215         0)
1216     {
1217
1218         if (s1->mpeg_enc_ctx_allocated) {
1219             ParseContext pc= s->parse_context;
1220             s->parse_context.buffer=0;
1221             MPV_common_end(s);
1222             s->parse_context= pc;
1223         }
1224
1225         if( (s->width == 0 )||(s->height == 0))
1226             return -2;
1227
1228         avcodec_set_dimensions(avctx, s->width, s->height);
1229         avctx->bit_rate = s->bit_rate;
1230         s1->save_aspect_info = s->aspect_ratio_info;
1231         s1->save_width = s->width;
1232         s1->save_height = s->height;
1233
1234      //low_delay may be forced, in this case we will have B frames
1235      //that behave like P frames
1236         avctx->has_b_frames = !(s->low_delay);
1237
1238         if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
1239             //mpeg1 fps
1240             avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1241             avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1242             //mpeg1 aspect
1243             avctx->sample_aspect_ratio= av_d2q(
1244                     1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1245
1246         }else{//mpeg2
1247         //mpeg2 fps
1248             av_reduce(
1249                 &s->avctx->time_base.den,
1250                 &s->avctx->time_base.num,
1251                 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1252                 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1253                 1<<30);
1254         //mpeg2 aspect
1255             if(s->aspect_ratio_info > 1){
1256                 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
1257                     s->avctx->sample_aspect_ratio=
1258                         av_div_q(
1259                          ff_mpeg2_aspect[s->aspect_ratio_info],
1260                          (AVRational){s->width, s->height}
1261                          );
1262                 }else{
1263                     s->avctx->sample_aspect_ratio=
1264                         av_div_q(
1265                          ff_mpeg2_aspect[s->aspect_ratio_info],
1266                          (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1267                         );
1268                 }
1269             }else{
1270                 s->avctx->sample_aspect_ratio=
1271                     ff_mpeg2_aspect[s->aspect_ratio_info];
1272             }
1273         }//mpeg2
1274
1275         if(avctx->xvmc_acceleration){
1276             avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1277         }else{
1278             if(s->chroma_format <  2){
1279                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
1280             }else
1281             if(s->chroma_format == 2){
1282                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
1283             }else
1284             if(s->chroma_format >  2){
1285                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
1286             }
1287         }
1288         //until then pix_fmt may be changed right after codec init
1289         if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
1290             if( avctx->idct_algo == FF_IDCT_AUTO )
1291                 avctx->idct_algo = FF_IDCT_SIMPLE;
1292
1293         //quantization matrixes may need reordering
1294         //if dct permutation is changed
1295         memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1296
1297         if (MPV_common_init(s) < 0)
1298             return -2;
1299
1300         quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
1301         quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
1302         quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1303         quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1304
1305         s1->mpeg_enc_ctx_allocated = 1;
1306     }
1307     return 0;
1308 }
1309
1310 static int mpeg1_decode_picture(AVCodecContext *avctx,
1311                                 const uint8_t *buf, int buf_size)
1312 {
1313     Mpeg1Context *s1 = avctx->priv_data;
1314     MpegEncContext *s = &s1->mpeg_enc_ctx;
1315     int ref, f_code, vbv_delay;
1316
1317     if(mpeg_decode_postinit(s->avctx) < 0)
1318        return -2;
1319
1320     init_get_bits(&s->gb, buf, buf_size*8);
1321
1322     ref = get_bits(&s->gb, 10); /* temporal ref */
1323     s->pict_type = get_bits(&s->gb, 3);
1324     if(s->pict_type == 0 || s->pict_type > 3)
1325         return -1;
1326
1327     vbv_delay= get_bits(&s->gb, 16);
1328     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1329         s->full_pel[0] = get_bits1(&s->gb);
1330         f_code = get_bits(&s->gb, 3);
1331         if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1332             return -1;
1333         s->mpeg_f_code[0][0] = f_code;
1334         s->mpeg_f_code[0][1] = f_code;
1335     }
1336     if (s->pict_type == B_TYPE) {
1337         s->full_pel[1] = get_bits1(&s->gb);
1338         f_code = get_bits(&s->gb, 3);
1339         if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1340             return -1;
1341         s->mpeg_f_code[1][0] = f_code;
1342         s->mpeg_f_code[1][1] = f_code;
1343     }
1344     s->current_picture.pict_type= s->pict_type;
1345     s->current_picture.key_frame= s->pict_type == I_TYPE;
1346
1347     if(avctx->debug & FF_DEBUG_PICT_INFO)
1348         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1349
1350     s->y_dc_scale = 8;
1351     s->c_dc_scale = 8;
1352     s->first_slice = 1;
1353     return 0;
1354 }
1355
1356 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1357 {
1358     MpegEncContext *s= &s1->mpeg_enc_ctx;
1359     int horiz_size_ext, vert_size_ext;
1360     int bit_rate_ext;
1361
1362     skip_bits(&s->gb, 1); /* profil and level esc*/
1363     s->avctx->profile= get_bits(&s->gb, 3);
1364     s->avctx->level= get_bits(&s->gb, 4);
1365     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1366     s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1367     horiz_size_ext = get_bits(&s->gb, 2);
1368     vert_size_ext = get_bits(&s->gb, 2);
1369     s->width |= (horiz_size_ext << 12);
1370     s->height |= (vert_size_ext << 12);
1371     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1372     s->bit_rate += (bit_rate_ext << 18) * 400;
1373     skip_bits1(&s->gb); /* marker */
1374     s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1375
1376     s->low_delay = get_bits1(&s->gb);
1377     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1378
1379     s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1380     s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1381
1382     dprintf(s->avctx, "sequence extension\n");
1383     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1384     s->avctx->sub_id = 2; /* indicates mpeg2 found */
1385
1386     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1387         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1388                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1389
1390 }
1391
1392 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1393 {
1394     MpegEncContext *s= &s1->mpeg_enc_ctx;
1395     int color_description, w, h;
1396
1397     skip_bits(&s->gb, 3); /* video format */
1398     color_description= get_bits1(&s->gb);
1399     if(color_description){
1400         skip_bits(&s->gb, 8); /* color primaries */
1401         skip_bits(&s->gb, 8); /* transfer_characteristics */
1402         skip_bits(&s->gb, 8); /* matrix_coefficients */
1403     }
1404     w= get_bits(&s->gb, 14);
1405     skip_bits(&s->gb, 1); //marker
1406     h= get_bits(&s->gb, 14);
1407     skip_bits(&s->gb, 1); //marker
1408
1409     s1->pan_scan.width= 16*w;
1410     s1->pan_scan.height=16*h;
1411
1412     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1413         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1414 }
1415
1416 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1417 {
1418     MpegEncContext *s= &s1->mpeg_enc_ctx;
1419     int i,nofco;
1420
1421     nofco = 1;
1422     if(s->progressive_sequence){
1423         if(s->repeat_first_field){
1424             nofco++;
1425             if(s->top_field_first)
1426                 nofco++;
1427         }
1428     }else{
1429         if(s->picture_structure == PICT_FRAME){
1430             nofco++;
1431             if(s->repeat_first_field)
1432                 nofco++;
1433         }
1434     }
1435     for(i=0; i<nofco; i++){
1436         s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1437         skip_bits(&s->gb, 1); //marker
1438         s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1439         skip_bits(&s->gb, 1); //marker
1440     }
1441
1442     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1443         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1444             s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1445             s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1446             s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1447         );
1448 }
1449
1450 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1451 {
1452     int i, v, j;
1453
1454     dprintf(s->avctx, "matrix extension\n");
1455
1456     if (get_bits1(&s->gb)) {
1457         for(i=0;i<64;i++) {
1458             v = get_bits(&s->gb, 8);
1459             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1460             s->intra_matrix[j] = v;
1461             s->chroma_intra_matrix[j] = v;
1462         }
1463     }
1464     if (get_bits1(&s->gb)) {
1465         for(i=0;i<64;i++) {
1466             v = get_bits(&s->gb, 8);
1467             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1468             s->inter_matrix[j] = v;
1469             s->chroma_inter_matrix[j] = v;
1470         }
1471     }
1472     if (get_bits1(&s->gb)) {
1473         for(i=0;i<64;i++) {
1474             v = get_bits(&s->gb, 8);
1475             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1476             s->chroma_intra_matrix[j] = v;
1477         }
1478     }
1479     if (get_bits1(&s->gb)) {
1480         for(i=0;i<64;i++) {
1481             v = get_bits(&s->gb, 8);
1482             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1483             s->chroma_inter_matrix[j] = v;
1484         }
1485     }
1486 }
1487
1488 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1489 {
1490     s->full_pel[0] = s->full_pel[1] = 0;
1491     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1492     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1493     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1494     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1495     s->intra_dc_precision = get_bits(&s->gb, 2);
1496     s->picture_structure = get_bits(&s->gb, 2);
1497     s->top_field_first = get_bits1(&s->gb);
1498     s->frame_pred_frame_dct = get_bits1(&s->gb);
1499     s->concealment_motion_vectors = get_bits1(&s->gb);
1500     s->q_scale_type = get_bits1(&s->gb);
1501     s->intra_vlc_format = get_bits1(&s->gb);
1502     s->alternate_scan = get_bits1(&s->gb);
1503     s->repeat_first_field = get_bits1(&s->gb);
1504     s->chroma_420_type = get_bits1(&s->gb);
1505     s->progressive_frame = get_bits1(&s->gb);
1506
1507     if(s->picture_structure == PICT_FRAME){
1508         s->first_field=0;
1509         s->v_edge_pos= 16*s->mb_height;
1510     }else{
1511         s->first_field ^= 1;
1512         s->v_edge_pos=  8*s->mb_height;
1513         memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1514     }
1515
1516     if(s->alternate_scan){
1517         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
1518         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
1519     }else{
1520         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
1521         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
1522     }
1523
1524     /* composite display not parsed */
1525     dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1526     dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1527     dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1528     dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1529     dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1530     dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1531     dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1532     dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1533     dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1534 }
1535
1536 static void mpeg_decode_extension(AVCodecContext *avctx,
1537                                   const uint8_t *buf, int buf_size)
1538 {
1539     Mpeg1Context *s1 = avctx->priv_data;
1540     MpegEncContext *s = &s1->mpeg_enc_ctx;
1541     int ext_type;
1542
1543     init_get_bits(&s->gb, buf, buf_size*8);
1544
1545     ext_type = get_bits(&s->gb, 4);
1546     switch(ext_type) {
1547     case 0x1:
1548         mpeg_decode_sequence_extension(s1);
1549         break;
1550     case 0x2:
1551         mpeg_decode_sequence_display_extension(s1);
1552         break;
1553     case 0x3:
1554         mpeg_decode_quant_matrix_extension(s);
1555         break;
1556     case 0x7:
1557         mpeg_decode_picture_display_extension(s1);
1558         break;
1559     case 0x8:
1560         mpeg_decode_picture_coding_extension(s);
1561         break;
1562     }
1563 }
1564
1565 static void exchange_uv(MpegEncContext *s){
1566     short * tmp = s->pblocks[4];
1567     s->pblocks[4] = s->pblocks[5];
1568     s->pblocks[5] = tmp;
1569 }
1570
1571 static int mpeg_field_start(MpegEncContext *s){
1572     AVCodecContext *avctx= s->avctx;
1573     Mpeg1Context *s1 = (Mpeg1Context*)s;
1574
1575     /* start frame decoding */
1576     if(s->first_field || s->picture_structure==PICT_FRAME){
1577         if(MPV_frame_start(s, avctx) < 0)
1578             return -1;
1579
1580         ff_er_frame_start(s);
1581
1582         /* first check if we must repeat the frame */
1583         s->current_picture_ptr->repeat_pict = 0;
1584         if (s->repeat_first_field) {
1585             if (s->progressive_sequence) {
1586                 if (s->top_field_first)
1587                     s->current_picture_ptr->repeat_pict = 4;
1588                 else
1589                     s->current_picture_ptr->repeat_pict = 2;
1590             } else if (s->progressive_frame) {
1591                 s->current_picture_ptr->repeat_pict = 1;
1592             }
1593         }
1594
1595         *s->current_picture_ptr->pan_scan= s1->pan_scan;
1596     }else{ //second field
1597             int i;
1598
1599             if(!s->current_picture_ptr){
1600                 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1601                 return -1;
1602             }
1603
1604             for(i=0; i<4; i++){
1605                 s->current_picture.data[i] = s->current_picture_ptr->data[i];
1606                 if(s->picture_structure == PICT_BOTTOM_FIELD){
1607                     s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1608                 }
1609             }
1610     }
1611 #ifdef HAVE_XVMC
1612 // MPV_frame_start will call this function too,
1613 // but we need to call it on every field
1614     if(s->avctx->xvmc_acceleration)
1615          XVMC_field_start(s,avctx);
1616 #endif
1617
1618     return 0;
1619 }
1620
1621 #define DECODE_SLICE_ERROR -1
1622 #define DECODE_SLICE_OK 0
1623
1624 /**
1625  * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1626  * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1627  *         DECODE_SLICE_OK if this slice is ok<br>
1628  */
1629 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1630                              const uint8_t **buf, int buf_size)
1631 {
1632     MpegEncContext *s = &s1->mpeg_enc_ctx;
1633     AVCodecContext *avctx= s->avctx;
1634     const int field_pic= s->picture_structure != PICT_FRAME;
1635     const int lowres= s->avctx->lowres;
1636
1637     s->resync_mb_x=
1638     s->resync_mb_y= -1;
1639
1640     if (mb_y<<field_pic >= s->mb_height){
1641         av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
1642         return -1;
1643     }
1644
1645     init_get_bits(&s->gb, *buf, buf_size*8);
1646
1647     ff_mpeg1_clean_buffers(s);
1648     s->interlaced_dct = 0;
1649
1650     s->qscale = get_qscale(s);
1651
1652     if(s->qscale == 0){
1653         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1654         return -1;
1655     }
1656
1657     /* extra slice info */
1658     while (get_bits1(&s->gb) != 0) {
1659         skip_bits(&s->gb, 8);
1660     }
1661
1662     s->mb_x=0;
1663
1664     for(;;) {
1665         int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1666         if (code < 0){
1667             av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1668             return -1;
1669         }
1670         if (code >= 33) {
1671             if (code == 33) {
1672                 s->mb_x += 33;
1673             }
1674             /* otherwise, stuffing, nothing to do */
1675         } else {
1676             s->mb_x += code;
1677             break;
1678         }
1679     }
1680     if(s->mb_x >= (unsigned)s->mb_width){
1681         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1682         return -1;
1683     }
1684
1685     s->resync_mb_x= s->mb_x;
1686     s->resync_mb_y= s->mb_y= mb_y;
1687     s->mb_skip_run= 0;
1688     ff_init_block_index(s);
1689
1690     if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1691         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1692              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",
1693                  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],
1694                  s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
1695                  s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1696                  s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1697                  s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1698         }
1699     }
1700
1701     for(;;) {
1702 #ifdef HAVE_XVMC
1703         //one 1 we memcpy blocks in xvmcvideo
1704         if(s->avctx->xvmc_acceleration > 1)
1705             XVMC_init_block(s);//set s->block
1706 #endif
1707
1708         if(mpeg_decode_mb(s, s->block) < 0)
1709             return -1;
1710
1711         if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1712             const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
1713             int xy = s->mb_x*2 + s->mb_y*2*wrap;
1714             int motion_x, motion_y, dir, i;
1715             if(field_pic && !s->first_field)
1716                 xy += wrap/2;
1717
1718             for(i=0; i<2; i++){
1719                 for(dir=0; dir<2; dir++){
1720                     if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
1721                         motion_x = motion_y = 0;
1722                     }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1723                         motion_x = s->mv[dir][0][0];
1724                         motion_y = s->mv[dir][0][1];
1725                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1726                         motion_x = s->mv[dir][i][0];
1727                         motion_y = s->mv[dir][i][1];
1728                     }
1729
1730                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1731                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1732                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1733                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1734                     s->current_picture.ref_index [dir][xy    ]=
1735                     s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
1736                     assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1737                 }
1738                 xy += wrap;
1739             }
1740         }
1741
1742         s->dest[0] += 16 >> lowres;
1743         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1744         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1745
1746         MPV_decode_mb(s, s->block);
1747
1748         if (++s->mb_x >= s->mb_width) {
1749             const int mb_size= 16>>s->avctx->lowres;
1750
1751             ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
1752
1753             s->mb_x = 0;
1754             s->mb_y++;
1755
1756             if(s->mb_y<<field_pic >= s->mb_height){
1757                 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
1758                 int is_d10= s->chroma_format==2 && s->pict_type==I_TYPE && avctx->profile==0 && avctx->level==5
1759                             && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1760                             && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1761
1762                 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1763                    || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
1764                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1765                     return -1;
1766                 }else
1767                     goto eos;
1768             }
1769
1770             ff_init_block_index(s);
1771         }
1772
1773         /* skip mb handling */
1774         if (s->mb_skip_run == -1) {
1775             /* read again increment */
1776             s->mb_skip_run = 0;
1777             for(;;) {
1778                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1779                 if (code < 0){
1780                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1781                     return -1;
1782                 }
1783                 if (code >= 33) {
1784                     if (code == 33) {
1785                         s->mb_skip_run += 33;
1786                     }else if(code == 35){
1787                         if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1788                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1789                             return -1;
1790                         }
1791                         goto eos; /* end of slice */
1792                     }
1793                     /* otherwise, stuffing, nothing to do */
1794                 } else {
1795                     s->mb_skip_run += code;
1796                     break;
1797                 }
1798             }
1799             if(s->mb_skip_run){
1800                 int i;
1801                 if(s->pict_type == I_TYPE){
1802                     av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1803                     return -1;
1804                 }
1805
1806                 /* skip mb */
1807                 s->mb_intra = 0;
1808                 for(i=0;i<12;i++)
1809                     s->block_last_index[i] = -1;
1810                 if(s->picture_structure == PICT_FRAME)
1811                     s->mv_type = MV_TYPE_16X16;
1812                 else
1813                     s->mv_type = MV_TYPE_FIELD;
1814                 if (s->pict_type == P_TYPE) {
1815                     /* if P type, zero motion vector is implied */
1816                     s->mv_dir = MV_DIR_FORWARD;
1817                     s->mv[0][0][0] = s->mv[0][0][1] = 0;
1818                     s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1819                     s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1820                     s->field_select[0][0]= s->picture_structure - 1;
1821                 } else {
1822                     /* if B type, reuse previous vectors and directions */
1823                     s->mv[0][0][0] = s->last_mv[0][0][0];
1824                     s->mv[0][0][1] = s->last_mv[0][0][1];
1825                     s->mv[1][0][0] = s->last_mv[1][0][0];
1826                     s->mv[1][0][1] = s->last_mv[1][0][1];
1827                 }
1828             }
1829         }
1830     }
1831 eos: // end of slice
1832     *buf += get_bits_count(&s->gb)/8 - 1;
1833 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1834     return 0;
1835 }
1836
1837 static int slice_decode_thread(AVCodecContext *c, void *arg){
1838     MpegEncContext *s= arg;
1839     const uint8_t *buf= s->gb.buffer;
1840     int mb_y= s->start_mb_y;
1841
1842     s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
1843
1844     for(;;){
1845         uint32_t start_code;
1846         int ret;
1847
1848         ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1849         emms_c();
1850 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1851 //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);
1852         if(ret < 0){
1853             if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1854                 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);
1855         }else{
1856             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);
1857         }
1858
1859         if(s->mb_y == s->end_mb_y)
1860             return 0;
1861
1862         start_code= -1;
1863         buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1864         mb_y= start_code - SLICE_MIN_START_CODE;
1865         if(mb_y < 0 || mb_y >= s->end_mb_y)
1866             return -1;
1867     }
1868
1869     return 0; //not reached
1870 }
1871
1872 /**
1873  * handles slice ends.
1874  * @return 1 if it seems to be the last slice of
1875  */
1876 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1877 {
1878     Mpeg1Context *s1 = avctx->priv_data;
1879     MpegEncContext *s = &s1->mpeg_enc_ctx;
1880
1881     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1882         return 0;
1883
1884 #ifdef HAVE_XVMC
1885     if(s->avctx->xvmc_acceleration)
1886         XVMC_field_end(s);
1887 #endif
1888     /* end of slice reached */
1889     if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1890         /* end of image */
1891
1892         s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1893
1894         ff_er_frame_end(s);
1895
1896         MPV_frame_end(s);
1897
1898         if (s->pict_type == B_TYPE || s->low_delay) {
1899             *pict= *(AVFrame*)s->current_picture_ptr;
1900             ff_print_debug_info(s, pict);
1901         } else {
1902             s->picture_number++;
1903             /* latency of 1 frame for I and P frames */
1904             /* XXX: use another variable than picture_number */
1905             if (s->last_picture_ptr != NULL) {
1906                 *pict= *(AVFrame*)s->last_picture_ptr;
1907                  ff_print_debug_info(s, pict);
1908             }
1909         }
1910
1911         return 1;
1912     } else {
1913         return 0;
1914     }
1915 }
1916
1917 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1918                                  const uint8_t *buf, int buf_size)
1919 {
1920     Mpeg1Context *s1 = avctx->priv_data;
1921     MpegEncContext *s = &s1->mpeg_enc_ctx;
1922     int width,height;
1923     int i, v, j;
1924
1925     init_get_bits(&s->gb, buf, buf_size*8);
1926
1927     width = get_bits(&s->gb, 12);
1928     height = get_bits(&s->gb, 12);
1929     if (width <= 0 || height <= 0 ||
1930         (width % 2) != 0 || (height % 2) != 0)
1931         return -1;
1932     s->aspect_ratio_info= get_bits(&s->gb, 4);
1933     if (s->aspect_ratio_info == 0)
1934         return -1;
1935     s->frame_rate_index = get_bits(&s->gb, 4);
1936     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1937         return -1;
1938     s->bit_rate = get_bits(&s->gb, 18) * 400;
1939     if (get_bits1(&s->gb) == 0) /* marker */
1940         return -1;
1941     s->width = width;
1942     s->height = height;
1943
1944     s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
1945     skip_bits(&s->gb, 1);
1946
1947     /* get matrix */
1948     if (get_bits1(&s->gb)) {
1949         for(i=0;i<64;i++) {
1950             v = get_bits(&s->gb, 8);
1951             if(v==0){
1952                 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
1953                 return -1;
1954             }
1955             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1956             s->intra_matrix[j] = v;
1957             s->chroma_intra_matrix[j] = v;
1958         }
1959 #ifdef DEBUG
1960         dprintf(s->avctx, "intra matrix present\n");
1961         for(i=0;i<64;i++)
1962             dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
1963         dprintf(s->avctx, "\n");
1964 #endif
1965     } else {
1966         for(i=0;i<64;i++) {
1967             j = s->dsp.idct_permutation[i];
1968             v = ff_mpeg1_default_intra_matrix[i];
1969             s->intra_matrix[j] = v;
1970             s->chroma_intra_matrix[j] = v;
1971         }
1972     }
1973     if (get_bits1(&s->gb)) {
1974         for(i=0;i<64;i++) {
1975             v = get_bits(&s->gb, 8);
1976             if(v==0){
1977                 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
1978                 return -1;
1979             }
1980             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1981             s->inter_matrix[j] = v;
1982             s->chroma_inter_matrix[j] = v;
1983         }
1984 #ifdef DEBUG
1985         dprintf(s->avctx, "non intra matrix present\n");
1986         for(i=0;i<64;i++)
1987             dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
1988         dprintf(s->avctx, "\n");
1989 #endif
1990     } else {
1991         for(i=0;i<64;i++) {
1992             int j= s->dsp.idct_permutation[i];
1993             v = ff_mpeg1_default_non_intra_matrix[i];
1994             s->inter_matrix[j] = v;
1995             s->chroma_inter_matrix[j] = v;
1996         }
1997     }
1998
1999     if(show_bits(&s->gb, 23) != 0){
2000         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2001         return -1;
2002     }
2003
2004     /* we set mpeg2 parameters so that it emulates mpeg1 */
2005     s->progressive_sequence = 1;
2006     s->progressive_frame = 1;
2007     s->picture_structure = PICT_FRAME;
2008     s->frame_pred_frame_dct = 1;
2009     s->chroma_format = 1;
2010     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2011     avctx->sub_id = 1; /* indicates mpeg1 */
2012     s->out_format = FMT_MPEG1;
2013     s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2014     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2015
2016     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2017         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2018                s->avctx->rc_buffer_size, s->bit_rate);
2019
2020     return 0;
2021 }
2022
2023 static int vcr2_init_sequence(AVCodecContext *avctx)
2024 {
2025     Mpeg1Context *s1 = avctx->priv_data;
2026     MpegEncContext *s = &s1->mpeg_enc_ctx;
2027     int i, v;
2028
2029     /* start new mpeg1 context decoding */
2030     s->out_format = FMT_MPEG1;
2031     if (s1->mpeg_enc_ctx_allocated) {
2032         MPV_common_end(s);
2033     }
2034     s->width  = avctx->coded_width;
2035     s->height = avctx->coded_height;
2036     avctx->has_b_frames= 0; //true?
2037     s->low_delay= 1;
2038
2039     if(avctx->xvmc_acceleration){
2040         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2041     }else{
2042         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2043     }
2044
2045     if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2046         if( avctx->idct_algo == FF_IDCT_AUTO )
2047             avctx->idct_algo = FF_IDCT_SIMPLE;
2048
2049     if (MPV_common_init(s) < 0)
2050         return -1;
2051     exchange_uv(s);//common init reset pblocks, so we swap them here
2052     s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2053     s1->mpeg_enc_ctx_allocated = 1;
2054
2055     for(i=0;i<64;i++) {
2056         int j= s->dsp.idct_permutation[i];
2057         v = ff_mpeg1_default_intra_matrix[i];
2058         s->intra_matrix[j] = v;
2059         s->chroma_intra_matrix[j] = v;
2060
2061         v = ff_mpeg1_default_non_intra_matrix[i];
2062         s->inter_matrix[j] = v;
2063         s->chroma_inter_matrix[j] = v;
2064     }
2065
2066     s->progressive_sequence = 1;
2067     s->progressive_frame = 1;
2068     s->picture_structure = PICT_FRAME;
2069     s->frame_pred_frame_dct = 1;
2070     s->chroma_format = 1;
2071     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2072     avctx->sub_id = 2; /* indicates mpeg2 */
2073     return 0;
2074 }
2075
2076
2077 static void mpeg_decode_user_data(AVCodecContext *avctx,
2078                                   const uint8_t *buf, int buf_size)
2079 {
2080     const uint8_t *p;
2081     int len, flags;
2082     p = buf;
2083     len = buf_size;
2084
2085     /* we parse the DTG active format information */
2086     if (len >= 5 &&
2087         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2088         flags = p[4];
2089         p += 5;
2090         len -= 5;
2091         if (flags & 0x80) {
2092             /* skip event id */
2093             if (len < 2)
2094                 return;
2095             p += 2;
2096             len -= 2;
2097         }
2098         if (flags & 0x40) {
2099             if (len < 1)
2100                 return;
2101             avctx->dtg_active_format = p[0] & 0x0f;
2102         }
2103     }
2104 }
2105
2106 static void mpeg_decode_gop(AVCodecContext *avctx,
2107                             const uint8_t *buf, int buf_size){
2108     Mpeg1Context *s1 = avctx->priv_data;
2109     MpegEncContext *s = &s1->mpeg_enc_ctx;
2110
2111     int drop_frame_flag;
2112     int time_code_hours, time_code_minutes;
2113     int time_code_seconds, time_code_pictures;
2114     int broken_link;
2115
2116     init_get_bits(&s->gb, buf, buf_size*8);
2117
2118     drop_frame_flag = get_bits1(&s->gb);
2119
2120     time_code_hours=get_bits(&s->gb,5);
2121     time_code_minutes = get_bits(&s->gb,6);
2122     skip_bits1(&s->gb);//marker bit
2123     time_code_seconds = get_bits(&s->gb,6);
2124     time_code_pictures = get_bits(&s->gb,6);
2125
2126     /*broken_link indicate that after editing the
2127       reference frames of the first B-Frames after GOP I-Frame
2128       are missing (open gop)*/
2129     broken_link = get_bits1(&s->gb);
2130
2131     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2132         av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
2133             time_code_hours, time_code_minutes, time_code_seconds,
2134             time_code_pictures, broken_link);
2135 }
2136 /**
2137  * finds the end of the current frame in the bitstream.
2138  * @return the position of the first byte of the next frame, or -1
2139  */
2140 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2141 {
2142     int i;
2143     uint32_t state= pc->state;
2144
2145     i=0;
2146     if(!pc->frame_start_found){
2147         for(i=0; i<buf_size; i++){
2148             i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2149             if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2150                 i++;
2151                 pc->frame_start_found=1;
2152                 break;
2153             }
2154         }
2155     }
2156
2157     if(pc->frame_start_found){
2158         /* EOF considered as end of frame */
2159         if (buf_size == 0)
2160             return 0;
2161         for(; i<buf_size; i++){
2162             i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2163             if((state&0xFFFFFF00) == 0x100){
2164                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2165                     pc->frame_start_found=0;
2166                     pc->state=-1;
2167                     return i-3;
2168                 }
2169             }
2170         }
2171     }
2172     pc->state= state;
2173     return END_NOT_FOUND;
2174 }
2175
2176 /* handle buffering and image synchronisation */
2177 static int mpeg_decode_frame(AVCodecContext *avctx,
2178                              void *data, int *data_size,
2179                              uint8_t *buf, int buf_size)
2180 {
2181     Mpeg1Context *s = avctx->priv_data;
2182     const uint8_t *buf_end;
2183     const uint8_t *buf_ptr;
2184     uint32_t start_code;
2185     int ret, input_size;
2186     AVFrame *picture = data;
2187     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2188     dprintf(avctx, "fill_buffer\n");
2189
2190     if (buf_size == 0) {
2191         /* special case for last picture */
2192         if (s2->low_delay==0 && s2->next_picture_ptr) {
2193             *picture= *(AVFrame*)s2->next_picture_ptr;
2194             s2->next_picture_ptr= NULL;
2195
2196             *data_size = sizeof(AVFrame);
2197         }
2198         return 0;
2199     }
2200
2201     if(s2->flags&CODEC_FLAG_TRUNCATED){
2202         int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
2203
2204         if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2205             return buf_size;
2206     }
2207
2208     buf_ptr = buf;
2209     buf_end = buf + buf_size;
2210
2211 #if 0
2212     if (s->repeat_field % 2 == 1) {
2213         s->repeat_field++;
2214         //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2215         //        s2->picture_number, s->repeat_field);
2216         if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2217             *data_size = sizeof(AVPicture);
2218             goto the_end;
2219         }
2220     }
2221 #endif
2222
2223     if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2224         vcr2_init_sequence(avctx);
2225
2226     s->slice_count= 0;
2227
2228     for(;;) {
2229         /* find start next code */
2230         start_code = -1;
2231         buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2232         if (start_code > 0x1ff){
2233             if(s2->pict_type != B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2234                 if(avctx->thread_count > 1){
2235                     int i;
2236
2237                     avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
2238                     for(i=0; i<s->slice_count; i++)
2239                         s2->error_count += s2->thread_context[i]->error_count;
2240                 }
2241                 if (slice_end(avctx, picture)) {
2242                     if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2243                         *data_size = sizeof(AVPicture);
2244                 }
2245             }
2246             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2247         }
2248
2249         input_size = buf_end - buf_ptr;
2250
2251         if(avctx->debug & FF_DEBUG_STARTCODE){
2252             av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
2253         }
2254
2255         /* prepare data for next start code */
2256         switch(start_code) {
2257         case SEQ_START_CODE:
2258             mpeg1_decode_sequence(avctx, buf_ptr,
2259                                     input_size);
2260             break;
2261
2262         case PICTURE_START_CODE:
2263             /* we have a complete image : we try to decompress it */
2264             mpeg1_decode_picture(avctx,
2265                                     buf_ptr, input_size);
2266             break;
2267         case EXT_START_CODE:
2268             mpeg_decode_extension(avctx,
2269                                     buf_ptr, input_size);
2270             break;
2271         case USER_START_CODE:
2272             mpeg_decode_user_data(avctx,
2273                                     buf_ptr, input_size);
2274             break;
2275         case GOP_START_CODE:
2276             s2->first_field=0;
2277             mpeg_decode_gop(avctx,
2278                                     buf_ptr, input_size);
2279             break;
2280         default:
2281             if (start_code >= SLICE_MIN_START_CODE &&
2282                 start_code <= SLICE_MAX_START_CODE) {
2283                 int mb_y= start_code - SLICE_MIN_START_CODE;
2284
2285                 if(s2->last_picture_ptr==NULL){
2286                 /* Skip B-frames if we do not have reference frames. */
2287                     if(s2->pict_type==B_TYPE) break;
2288                 /* Skip P-frames if we do not have reference frame no valid header. */
2289 //                    if(s2->pict_type==P_TYPE && s2->first_field && !s2->first_slice) break;
2290                 }
2291                 /* Skip B-frames if we are in a hurry. */
2292                 if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2293                 if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==B_TYPE)
2294                     ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=I_TYPE)
2295                     || avctx->skip_frame >= AVDISCARD_ALL)
2296                     break;
2297                 /* Skip everything if we are in a hurry>=5. */
2298                 if(avctx->hurry_up>=5) break;
2299
2300                 if (!s->mpeg_enc_ctx_allocated) break;
2301
2302                 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2303                     if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2304                         break;
2305                 }
2306
2307                 if(s2->first_slice){
2308                     s2->first_slice=0;
2309                             if(mpeg_field_start(s2) < 0)
2310                         return -1;
2311                     }
2312                 if(!s2->current_picture_ptr){
2313                     av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2314                     return -1;
2315                 }
2316
2317                 if(avctx->thread_count > 1){
2318                     int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2319                     if(threshold <= mb_y){
2320                         MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2321
2322                         thread_context->start_mb_y= mb_y;
2323                         thread_context->end_mb_y  = s2->mb_height;
2324                         if(s->slice_count){
2325                             s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2326                             ff_update_duplicate_context(thread_context, s2);
2327                         }
2328                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2329                         s->slice_count++;
2330                     }
2331                     buf_ptr += 2; //FIXME add minimum num of bytes per slice
2332                 }else{
2333                     ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2334                     emms_c();
2335
2336                     if(ret < 0){
2337                         if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2338                             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);
2339                     }else{
2340                         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);
2341                     }
2342                 }
2343             }
2344             break;
2345         }
2346     }
2347 }
2348
2349 static int mpeg_decode_end(AVCodecContext *avctx)
2350 {
2351     Mpeg1Context *s = avctx->priv_data;
2352
2353     if (s->mpeg_enc_ctx_allocated)
2354         MPV_common_end(&s->mpeg_enc_ctx);
2355     return 0;
2356 }
2357
2358 AVCodec mpeg1video_decoder = {
2359     "mpeg1video",
2360     CODEC_TYPE_VIDEO,
2361     CODEC_ID_MPEG1VIDEO,
2362     sizeof(Mpeg1Context),
2363     mpeg_decode_init,
2364     NULL,
2365     mpeg_decode_end,
2366     mpeg_decode_frame,
2367     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2368     .flush= ff_mpeg_flush,
2369 };
2370
2371 AVCodec mpeg2video_decoder = {
2372     "mpeg2video",
2373     CODEC_TYPE_VIDEO,
2374     CODEC_ID_MPEG2VIDEO,
2375     sizeof(Mpeg1Context),
2376     mpeg_decode_init,
2377     NULL,
2378     mpeg_decode_end,
2379     mpeg_decode_frame,
2380     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2381     .flush= ff_mpeg_flush,
2382 };
2383
2384 //legacy decoder
2385 AVCodec mpegvideo_decoder = {
2386     "mpegvideo",
2387     CODEC_TYPE_VIDEO,
2388     CODEC_ID_MPEG2VIDEO,
2389     sizeof(Mpeg1Context),
2390     mpeg_decode_init,
2391     NULL,
2392     mpeg_decode_end,
2393     mpeg_decode_frame,
2394     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2395     .flush= ff_mpeg_flush,
2396 };
2397
2398 #ifdef HAVE_XVMC
2399 static int mpeg_mc_decode_init(AVCodecContext *avctx){
2400     Mpeg1Context *s;
2401
2402     if( avctx->thread_count > 1)
2403         return -1;
2404     if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2405         return -1;
2406     if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2407         dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2408     }
2409     mpeg_decode_init(avctx);
2410     s = avctx->priv_data;
2411
2412     avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2413     avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2414
2415     return 0;
2416 }
2417
2418 AVCodec mpeg_xvmc_decoder = {
2419     "mpegvideo_xvmc",
2420     CODEC_TYPE_VIDEO,
2421     CODEC_ID_MPEG2VIDEO_XVMC,
2422     sizeof(Mpeg1Context),
2423     mpeg_mc_decode_init,
2424     NULL,
2425     mpeg_decode_end,
2426     mpeg_decode_frame,
2427     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2428     .flush= ff_mpeg_flush,
2429 };
2430
2431 #endif
2432
2433 /* this is ugly i know, but the alternative is too make
2434    hundreds of vars global and prefix them with ff_mpeg1_
2435    which is far uglier. */
2436 #include "mdec.c"