move some code which was executed for every skipped MB so it is only executed
[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             /* compute dct type */
342             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
343                 !s->frame_pred_frame_dct) {
344                 s->interlaced_dct = get_bits1(&s->gb);
345             }
346
347             if (IS_QUANT(mb_type))
348                 s->qscale = get_qscale(s);
349
350             s->mv_dir = MV_DIR_FORWARD;
351             if(s->picture_structure == PICT_FRAME)
352                 s->mv_type = MV_TYPE_16X16;
353             else{
354                 s->mv_type = MV_TYPE_FIELD;
355                 mb_type |= MB_TYPE_INTERLACED;
356                 s->field_select[0][0]= s->picture_structure - 1;
357             }
358             s->last_mv[0][0][0] = 0;
359             s->last_mv[0][0][1] = 0;
360             s->last_mv[0][1][0] = 0;
361             s->last_mv[0][1][1] = 0;
362             s->mv[0][0][0] = 0;
363             s->mv[0][0][1] = 0;
364         }else{
365             assert(mb_type & MB_TYPE_L0L1);
366 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
367             /* get additional motion vector type */
368             if (s->frame_pred_frame_dct)
369                 motion_type = MT_FRAME;
370             else{
371                 motion_type = get_bits(&s->gb, 2);
372             }
373
374             /* compute dct type */
375             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
376                 !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
377                 s->interlaced_dct = get_bits1(&s->gb);
378             }
379
380             if (IS_QUANT(mb_type))
381                 s->qscale = get_qscale(s);
382
383             /* motion vectors */
384             s->mv_dir = 0;
385             for(i=0;i<2;i++) {
386                 if (USES_LIST(mb_type, i)) {
387                     s->mv_dir |= (MV_DIR_FORWARD >> i);
388                     dprintf(s->avctx, "motion_type=%d\n", motion_type);
389                     switch(motion_type) {
390                     case MT_FRAME: /* or MT_16X8 */
391                         if (s->picture_structure == PICT_FRAME) {
392                             /* MT_FRAME */
393                             mb_type |= MB_TYPE_16x16;
394                             s->mv_type = MV_TYPE_16X16;
395                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
396                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
397                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
398                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
399                             /* full_pel: only for mpeg1 */
400                             if (s->full_pel[i]){
401                                 s->mv[i][0][0] <<= 1;
402                                 s->mv[i][0][1] <<= 1;
403                             }
404                         } else {
405                             /* MT_16X8 */
406                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
407                             s->mv_type = MV_TYPE_16X8;
408                             for(j=0;j<2;j++) {
409                                 s->field_select[i][j] = get_bits1(&s->gb);
410                                 for(k=0;k<2;k++) {
411                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
412                                                              s->last_mv[i][j][k]);
413                                     s->last_mv[i][j][k] = val;
414                                     s->mv[i][j][k] = val;
415                                 }
416                             }
417                         }
418                         break;
419                     case MT_FIELD:
420                         s->mv_type = MV_TYPE_FIELD;
421                         if (s->picture_structure == PICT_FRAME) {
422                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
423                             for(j=0;j<2;j++) {
424                                 s->field_select[i][j] = get_bits1(&s->gb);
425                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
426                                                          s->last_mv[i][j][0]);
427                                 s->last_mv[i][j][0] = val;
428                                 s->mv[i][j][0] = val;
429                                 dprintf(s->avctx, "fmx=%d\n", val);
430                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
431                                                          s->last_mv[i][j][1] >> 1);
432                                 s->last_mv[i][j][1] = val << 1;
433                                 s->mv[i][j][1] = val;
434                                 dprintf(s->avctx, "fmy=%d\n", val);
435                             }
436                         } else {
437                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
438                             s->field_select[i][0] = get_bits1(&s->gb);
439                             for(k=0;k<2;k++) {
440                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
441                                                          s->last_mv[i][0][k]);
442                                 s->last_mv[i][0][k] = val;
443                                 s->last_mv[i][1][k] = val;
444                                 s->mv[i][0][k] = val;
445                             }
446                         }
447                         break;
448                     case MT_DMV:
449                         {
450                             int dmx, dmy, mx, my, m;
451
452                             mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
453                                                     s->last_mv[i][0][0]);
454                             s->last_mv[i][0][0] = mx;
455                             s->last_mv[i][1][0] = mx;
456                             dmx = get_dmv(s);
457                             my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
458                                                     s->last_mv[i][0][1] >> 1);
459                             dmy = get_dmv(s);
460                             s->mv_type = MV_TYPE_DMV;
461
462
463                             s->last_mv[i][0][1] = my<<1;
464                             s->last_mv[i][1][1] = my<<1;
465
466                             s->mv[i][0][0] = mx;
467                             s->mv[i][0][1] = my;
468                             s->mv[i][1][0] = mx;//not used
469                             s->mv[i][1][1] = my;//not used
470
471                             if (s->picture_structure == PICT_FRAME) {
472                                 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
473
474                                 //m = 1 + 2 * s->top_field_first;
475                                 m = s->top_field_first ? 1 : 3;
476
477                                 /* top -> top pred */
478                                 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
479                                 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
480                                 m = 4 - m;
481                                 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
482                                 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
483                             } else {
484                                 mb_type |= MB_TYPE_16x16;
485
486                                 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
487                                 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
488                                 if(s->picture_structure == PICT_TOP_FIELD)
489                                     s->mv[i][2][1]--;
490                                 else
491                                     s->mv[i][2][1]++;
492                             }
493                         }
494                         break;
495                     default:
496                         av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
497                         return -1;
498                     }
499                 }
500             }
501         }
502
503         s->mb_intra = 0;
504         if (HAS_CBP(mb_type)) {
505             s->dsp.clear_blocks(s->block[0]);
506
507             if(!s->chroma_y_shift){
508                 s->dsp.clear_blocks(s->block[6]);
509             }
510
511             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
512             if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){
513                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
514                 return -1;
515             }
516             if(mb_block_count > 6){
517                  cbp<<= mb_block_count-6;
518                  cbp |= get_bits(&s->gb, mb_block_count-6);
519             }
520
521 #ifdef HAVE_XVMC
522             //on 1 we memcpy blocks in xvmcvideo
523             if(s->avctx->xvmc_acceleration > 1){
524                 XVMC_pack_pblocks(s,cbp);
525                 if(s->swap_uv){
526                     exchange_uv(s);
527                 }
528             }
529 #endif
530
531             if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
532                 if(s->flags2 & CODEC_FLAG2_FAST){
533                     for(i=0;i<6;i++) {
534                         if(cbp & 32) {
535                             mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
536                         } else {
537                             s->block_last_index[i] = -1;
538                         }
539                         cbp+=cbp;
540                     }
541                 }else{
542                     cbp<<= 12-mb_block_count;
543
544                     for(i=0;i<mb_block_count;i++) {
545                         if ( cbp & (1<<11) ) {
546                             if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
547                                 return -1;
548                         } else {
549                             s->block_last_index[i] = -1;
550                         }
551                         cbp+=cbp;
552                     }
553                 }
554             } else {
555                 if(s->flags2 & CODEC_FLAG2_FAST){
556                     for(i=0;i<6;i++) {
557                         if (cbp & 32) {
558                             mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
559                         } else {
560                             s->block_last_index[i] = -1;
561                         }
562                         cbp+=cbp;
563                     }
564                 }else{
565                     for(i=0;i<6;i++) {
566                         if (cbp & 32) {
567                             if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
568                                 return -1;
569                         } else {
570                             s->block_last_index[i] = -1;
571                         }
572                         cbp+=cbp;
573                     }
574                 }
575             }
576         }else{
577             for(i=0;i<12;i++)
578                 s->block_last_index[i] = -1;
579         }
580     }
581
582     s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
583
584     return 0;
585 }
586
587 /* as h263, but only 17 codes */
588 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
589 {
590     int code, sign, val, l, shift;
591
592     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
593     if (code == 0) {
594         return pred;
595     }
596     if (code < 0) {
597         return 0xffff;
598     }
599
600     sign = get_bits1(&s->gb);
601     shift = fcode - 1;
602     val = code;
603     if (shift) {
604         val = (val - 1) << shift;
605         val |= get_bits(&s->gb, shift);
606         val++;
607     }
608     if (sign)
609         val = -val;
610     val += pred;
611
612     /* modulo decoding */
613     l= INT_BIT - 5 - shift;
614     val = (val<<l)>>l;
615     return val;
616 }
617
618 static inline int decode_dc(GetBitContext *gb, int component)
619 {
620     int code, diff;
621
622     if (component == 0) {
623         code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
624     } else {
625         code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
626     }
627     if (code < 0){
628         av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
629         return 0xffff;
630     }
631     if (code == 0) {
632         diff = 0;
633     } else {
634         diff = get_xbits(gb, code);
635     }
636     return diff;
637 }
638
639 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
640                                DCTELEM *block,
641                                int n)
642 {
643     int level, dc, diff, i, j, run;
644     int component;
645     RLTable *rl = &ff_rl_mpeg1;
646     uint8_t * const scantable= s->intra_scantable.permutated;
647     const uint16_t *quant_matrix= s->intra_matrix;
648     const int qscale= s->qscale;
649
650     /* DC coef */
651     component = (n <= 3 ? 0 : n - 4 + 1);
652     diff = decode_dc(&s->gb, component);
653     if (diff >= 0xffff)
654         return -1;
655     dc = s->last_dc[component];
656     dc += diff;
657     s->last_dc[component] = dc;
658     block[0] = dc<<3;
659     dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
660     i = 0;
661     {
662         OPEN_READER(re, &s->gb);
663         /* now quantify & encode AC coefs */
664         for(;;) {
665             UPDATE_CACHE(re, &s->gb);
666             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
667
668             if(level == 127){
669                 break;
670             } else if(level != 0) {
671                 i += run;
672                 j = scantable[i];
673                 level= (level*qscale*quant_matrix[j])>>4;
674                 level= (level-1)|1;
675                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
676                 LAST_SKIP_BITS(re, &s->gb, 1);
677             } else {
678                 /* escape */
679                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
680                 UPDATE_CACHE(re, &s->gb);
681                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
682                 if (level == -128) {
683                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
684                 } else if (level == 0) {
685                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
686                 }
687                 i += run;
688                 j = scantable[i];
689                 if(level<0){
690                     level= -level;
691                     level= (level*qscale*quant_matrix[j])>>4;
692                     level= (level-1)|1;
693                     level= -level;
694                 }else{
695                     level= (level*qscale*quant_matrix[j])>>4;
696                     level= (level-1)|1;
697                 }
698             }
699             if (i > 63){
700                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
701                 return -1;
702             }
703
704             block[j] = level;
705         }
706         CLOSE_READER(re, &s->gb);
707     }
708     s->block_last_index[n] = i;
709    return 0;
710 }
711
712 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
713                                DCTELEM *block,
714                                int n)
715 {
716     int level, i, j, run;
717     RLTable *rl = &ff_rl_mpeg1;
718     uint8_t * const scantable= s->intra_scantable.permutated;
719     const uint16_t *quant_matrix= s->inter_matrix;
720     const int qscale= s->qscale;
721
722     {
723         OPEN_READER(re, &s->gb);
724         i = -1;
725         /* special case for the first coef. no need to add a second vlc table */
726         UPDATE_CACHE(re, &s->gb);
727         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
728             level= (3*qscale*quant_matrix[0])>>5;
729             level= (level-1)|1;
730             if(GET_CACHE(re, &s->gb)&0x40000000)
731                 level= -level;
732             block[0] = level;
733             i++;
734             SKIP_BITS(re, &s->gb, 2);
735             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
736                 goto end;
737         }
738
739         /* now quantify & encode AC coefs */
740         for(;;) {
741             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
742
743             if(level != 0) {
744                 i += run;
745                 j = scantable[i];
746                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
747                 level= (level-1)|1;
748                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
749                 SKIP_BITS(re, &s->gb, 1);
750             } else {
751                 /* escape */
752                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
753                 UPDATE_CACHE(re, &s->gb);
754                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
755                 if (level == -128) {
756                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
757                 } else if (level == 0) {
758                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
759                 }
760                 i += run;
761                 j = scantable[i];
762                 if(level<0){
763                     level= -level;
764                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
765                     level= (level-1)|1;
766                     level= -level;
767                 }else{
768                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
769                     level= (level-1)|1;
770                 }
771             }
772             if (i > 63){
773                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
774                 return -1;
775             }
776
777             block[j] = level;
778             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
779                 break;
780             UPDATE_CACHE(re, &s->gb);
781         }
782 end:
783         LAST_SKIP_BITS(re, &s->gb, 2);
784         CLOSE_READER(re, &s->gb);
785     }
786     s->block_last_index[n] = i;
787     return 0;
788 }
789
790 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
791 {
792     int level, i, j, run;
793     RLTable *rl = &ff_rl_mpeg1;
794     uint8_t * const scantable= s->intra_scantable.permutated;
795     const int qscale= s->qscale;
796
797     {
798         OPEN_READER(re, &s->gb);
799         i = -1;
800         /* special case for the first coef. no need to add a second vlc table */
801         UPDATE_CACHE(re, &s->gb);
802         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
803             level= (3*qscale)>>1;
804             level= (level-1)|1;
805             if(GET_CACHE(re, &s->gb)&0x40000000)
806                 level= -level;
807             block[0] = level;
808             i++;
809             SKIP_BITS(re, &s->gb, 2);
810             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
811                 goto end;
812         }
813
814         /* now quantify & encode AC coefs */
815         for(;;) {
816             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
817
818             if(level != 0) {
819                 i += run;
820                 j = scantable[i];
821                 level= ((level*2+1)*qscale)>>1;
822                 level= (level-1)|1;
823                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
824                 SKIP_BITS(re, &s->gb, 1);
825             } else {
826                 /* escape */
827                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
828                 UPDATE_CACHE(re, &s->gb);
829                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
830                 if (level == -128) {
831                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
832                 } else if (level == 0) {
833                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
834                 }
835                 i += run;
836                 j = scantable[i];
837                 if(level<0){
838                     level= -level;
839                     level= ((level*2+1)*qscale)>>1;
840                     level= (level-1)|1;
841                     level= -level;
842                 }else{
843                     level= ((level*2+1)*qscale)>>1;
844                     level= (level-1)|1;
845                 }
846             }
847
848             block[j] = level;
849             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
850                 break;
851             UPDATE_CACHE(re, &s->gb);
852         }
853 end:
854         LAST_SKIP_BITS(re, &s->gb, 2);
855         CLOSE_READER(re, &s->gb);
856     }
857     s->block_last_index[n] = i;
858     return 0;
859 }
860
861
862 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
863                                DCTELEM *block,
864                                int n)
865 {
866     int level, i, j, run;
867     RLTable *rl = &ff_rl_mpeg1;
868     uint8_t * const scantable= s->intra_scantable.permutated;
869     const uint16_t *quant_matrix;
870     const int qscale= s->qscale;
871     int mismatch;
872
873     mismatch = 1;
874
875     {
876         OPEN_READER(re, &s->gb);
877         i = -1;
878         if (n < 4)
879             quant_matrix = s->inter_matrix;
880         else
881             quant_matrix = s->chroma_inter_matrix;
882
883         /* special case for the first coef. no need to add a second vlc table */
884         UPDATE_CACHE(re, &s->gb);
885         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
886             level= (3*qscale*quant_matrix[0])>>5;
887             if(GET_CACHE(re, &s->gb)&0x40000000)
888                 level= -level;
889             block[0] = level;
890             mismatch ^= level;
891             i++;
892             SKIP_BITS(re, &s->gb, 2);
893             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
894                 goto end;
895         }
896
897         /* now quantify & encode AC coefs */
898         for(;;) {
899             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
900
901             if(level != 0) {
902                 i += run;
903                 j = scantable[i];
904                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
905                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
906                 SKIP_BITS(re, &s->gb, 1);
907             } else {
908                 /* escape */
909                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
910                 UPDATE_CACHE(re, &s->gb);
911                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
912
913                 i += run;
914                 j = scantable[i];
915                 if(level<0){
916                     level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
917                     level= -level;
918                 }else{
919                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
920                 }
921             }
922             if (i > 63){
923                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
924                 return -1;
925             }
926
927             mismatch ^= level;
928             block[j] = level;
929             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
930                 break;
931             UPDATE_CACHE(re, &s->gb);
932         }
933 end:
934         LAST_SKIP_BITS(re, &s->gb, 2);
935         CLOSE_READER(re, &s->gb);
936     }
937     block[63] ^= (mismatch & 1);
938
939     s->block_last_index[n] = i;
940     return 0;
941 }
942
943 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
944                                DCTELEM *block,
945                                int n)
946 {
947     int level, i, j, run;
948     RLTable *rl = &ff_rl_mpeg1;
949     uint8_t * const scantable= s->intra_scantable.permutated;
950     const int qscale= s->qscale;
951     OPEN_READER(re, &s->gb);
952     i = -1;
953
954     /* special case for the first coef. no need to add a second vlc table */
955     UPDATE_CACHE(re, &s->gb);
956     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
957         level= (3*qscale)>>1;
958         if(GET_CACHE(re, &s->gb)&0x40000000)
959             level= -level;
960         block[0] = level;
961         i++;
962         SKIP_BITS(re, &s->gb, 2);
963         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
964             goto end;
965     }
966
967     /* now quantify & encode AC coefs */
968     for(;;) {
969         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
970
971         if(level != 0) {
972             i += run;
973             j = scantable[i];
974             level= ((level*2+1)*qscale)>>1;
975             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
976             SKIP_BITS(re, &s->gb, 1);
977         } else {
978             /* escape */
979             run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
980             UPDATE_CACHE(re, &s->gb);
981             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
982
983             i += run;
984             j = scantable[i];
985             if(level<0){
986                 level= ((-level*2+1)*qscale)>>1;
987                 level= -level;
988             }else{
989                 level= ((level*2+1)*qscale)>>1;
990             }
991         }
992
993         block[j] = level;
994         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
995             break;
996         UPDATE_CACHE(re, &s->gb);
997     }
998 end:
999     LAST_SKIP_BITS(re, &s->gb, 2);
1000     CLOSE_READER(re, &s->gb);
1001     s->block_last_index[n] = i;
1002     return 0;
1003 }
1004
1005
1006 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1007                                DCTELEM *block,
1008                                int n)
1009 {
1010     int level, dc, diff, i, j, run;
1011     int component;
1012     RLTable *rl;
1013     uint8_t * const scantable= s->intra_scantable.permutated;
1014     const uint16_t *quant_matrix;
1015     const int qscale= s->qscale;
1016     int mismatch;
1017
1018     /* DC coef */
1019     if (n < 4){
1020         quant_matrix = s->intra_matrix;
1021         component = 0;
1022     }else{
1023         quant_matrix = s->chroma_intra_matrix;
1024         component = (n&1) + 1;
1025     }
1026     diff = decode_dc(&s->gb, component);
1027     if (diff >= 0xffff)
1028         return -1;
1029     dc = s->last_dc[component];
1030     dc += diff;
1031     s->last_dc[component] = dc;
1032     block[0] = dc << (3 - s->intra_dc_precision);
1033     dprintf(s->avctx, "dc=%d\n", block[0]);
1034     mismatch = block[0] ^ 1;
1035     i = 0;
1036     if (s->intra_vlc_format)
1037         rl = &ff_rl_mpeg2;
1038     else
1039         rl = &ff_rl_mpeg1;
1040
1041     {
1042         OPEN_READER(re, &s->gb);
1043         /* now quantify & encode AC coefs */
1044         for(;;) {
1045             UPDATE_CACHE(re, &s->gb);
1046             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1047
1048             if(level == 127){
1049                 break;
1050             } else if(level != 0) {
1051                 i += run;
1052                 j = scantable[i];
1053                 level= (level*qscale*quant_matrix[j])>>4;
1054                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1055                 LAST_SKIP_BITS(re, &s->gb, 1);
1056             } else {
1057                 /* escape */
1058                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1059                 UPDATE_CACHE(re, &s->gb);
1060                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1061                 i += run;
1062                 j = scantable[i];
1063                 if(level<0){
1064                     level= (-level*qscale*quant_matrix[j])>>4;
1065                     level= -level;
1066                 }else{
1067                     level= (level*qscale*quant_matrix[j])>>4;
1068                 }
1069             }
1070             if (i > 63){
1071                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1072                 return -1;
1073             }
1074
1075             mismatch^= level;
1076             block[j] = level;
1077         }
1078         CLOSE_READER(re, &s->gb);
1079     }
1080     block[63]^= mismatch&1;
1081
1082     s->block_last_index[n] = i;
1083     return 0;
1084 }
1085
1086 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1087                                DCTELEM *block,
1088                                int n)
1089 {
1090     int level, dc, diff, j, run;
1091     int component;
1092     RLTable *rl;
1093     uint8_t * scantable= s->intra_scantable.permutated;
1094     const uint16_t *quant_matrix;
1095     const int qscale= s->qscale;
1096
1097     /* DC coef */
1098     if (n < 4){
1099         quant_matrix = s->intra_matrix;
1100         component = 0;
1101     }else{
1102         quant_matrix = s->chroma_intra_matrix;
1103         component = (n&1) + 1;
1104     }
1105     diff = decode_dc(&s->gb, component);
1106     if (diff >= 0xffff)
1107         return -1;
1108     dc = s->last_dc[component];
1109     dc += diff;
1110     s->last_dc[component] = dc;
1111     block[0] = dc << (3 - s->intra_dc_precision);
1112     if (s->intra_vlc_format)
1113         rl = &ff_rl_mpeg2;
1114     else
1115         rl = &ff_rl_mpeg1;
1116
1117     {
1118         OPEN_READER(re, &s->gb);
1119         /* now quantify & encode AC coefs */
1120         for(;;) {
1121             UPDATE_CACHE(re, &s->gb);
1122             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1123
1124             if(level == 127){
1125                 break;
1126             } else if(level != 0) {
1127                 scantable += run;
1128                 j = *scantable;
1129                 level= (level*qscale*quant_matrix[j])>>4;
1130                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1131                 LAST_SKIP_BITS(re, &s->gb, 1);
1132             } else {
1133                 /* escape */
1134                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1135                 UPDATE_CACHE(re, &s->gb);
1136                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1137                 scantable += run;
1138                 j = *scantable;
1139                 if(level<0){
1140                     level= (-level*qscale*quant_matrix[j])>>4;
1141                     level= -level;
1142                 }else{
1143                     level= (level*qscale*quant_matrix[j])>>4;
1144                 }
1145             }
1146
1147             block[j] = level;
1148         }
1149         CLOSE_READER(re, &s->gb);
1150     }
1151
1152     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1153     return 0;
1154 }
1155
1156 typedef struct Mpeg1Context {
1157     MpegEncContext mpeg_enc_ctx;
1158     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1159     int repeat_field; /* true if we must repeat the field */
1160     AVPanScan pan_scan; /** some temporary storage for the panscan */
1161     int slice_count;
1162     int swap_uv;//indicate VCR2
1163     int save_aspect_info;
1164     int save_width, save_height;
1165     AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
1166
1167 } Mpeg1Context;
1168
1169 static int mpeg_decode_init(AVCodecContext *avctx)
1170 {
1171     Mpeg1Context *s = avctx->priv_data;
1172     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1173     int i;
1174
1175     //we need some parmutation to store
1176     //matrixes, until MPV_common_init()
1177     //set the real permutatuon
1178     for(i=0;i<64;i++)
1179        s2->dsp.idct_permutation[i]=i;
1180
1181     MPV_decode_defaults(s2);
1182
1183     s->mpeg_enc_ctx.avctx= avctx;
1184     s->mpeg_enc_ctx.flags= avctx->flags;
1185     s->mpeg_enc_ctx.flags2= avctx->flags2;
1186     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1187     init_vlcs();
1188
1189     s->mpeg_enc_ctx_allocated = 0;
1190     s->mpeg_enc_ctx.picture_number = 0;
1191     s->repeat_field = 0;
1192     s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1193     return 0;
1194 }
1195
1196 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1197                                      const uint8_t *new_perm){
1198     uint16_t temp_matrix[64];
1199     int i;
1200
1201     memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1202
1203     for(i=0;i<64;i++){
1204         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1205     }
1206 }
1207
1208 //Call this function when we know all parameters
1209 //it may be called in different places for mpeg1 and mpeg2
1210 static int mpeg_decode_postinit(AVCodecContext *avctx){
1211     Mpeg1Context *s1 = avctx->priv_data;
1212     MpegEncContext *s = &s1->mpeg_enc_ctx;
1213     uint8_t old_permutation[64];
1214
1215     if (
1216         (s1->mpeg_enc_ctx_allocated == 0)||
1217         avctx->coded_width  != s->width ||
1218         avctx->coded_height != s->height||
1219         s1->save_width != s->width ||
1220         s1->save_height != s->height ||
1221         s1->save_aspect_info != s->aspect_ratio_info||
1222         0)
1223     {
1224
1225         if (s1->mpeg_enc_ctx_allocated) {
1226             ParseContext pc= s->parse_context;
1227             s->parse_context.buffer=0;
1228             MPV_common_end(s);
1229             s->parse_context= pc;
1230         }
1231
1232         if( (s->width == 0 )||(s->height == 0))
1233             return -2;
1234
1235         avcodec_set_dimensions(avctx, s->width, s->height);
1236         avctx->bit_rate = s->bit_rate;
1237         s1->save_aspect_info = s->aspect_ratio_info;
1238         s1->save_width = s->width;
1239         s1->save_height = s->height;
1240
1241      //low_delay may be forced, in this case we will have B frames
1242      //that behave like P frames
1243         avctx->has_b_frames = !(s->low_delay);
1244
1245         if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
1246             //mpeg1 fps
1247             avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1248             avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1249             //mpeg1 aspect
1250             avctx->sample_aspect_ratio= av_d2q(
1251                     1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1252
1253         }else{//mpeg2
1254         //mpeg2 fps
1255             av_reduce(
1256                 &s->avctx->time_base.den,
1257                 &s->avctx->time_base.num,
1258                 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1259                 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1260                 1<<30);
1261         //mpeg2 aspect
1262             if(s->aspect_ratio_info > 1){
1263                 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
1264                     s->avctx->sample_aspect_ratio=
1265                         av_div_q(
1266                          ff_mpeg2_aspect[s->aspect_ratio_info],
1267                          (AVRational){s->width, s->height}
1268                          );
1269                 }else{
1270                     s->avctx->sample_aspect_ratio=
1271                         av_div_q(
1272                          ff_mpeg2_aspect[s->aspect_ratio_info],
1273                          (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1274                         );
1275                 }
1276             }else{
1277                 s->avctx->sample_aspect_ratio=
1278                     ff_mpeg2_aspect[s->aspect_ratio_info];
1279             }
1280         }//mpeg2
1281
1282         if(avctx->xvmc_acceleration){
1283             avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1284         }else{
1285             if(s->chroma_format <  2){
1286                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
1287             }else
1288             if(s->chroma_format == 2){
1289                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
1290             }else
1291             if(s->chroma_format >  2){
1292                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
1293             }
1294         }
1295         //until then pix_fmt may be changed right after codec init
1296         if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
1297             if( avctx->idct_algo == FF_IDCT_AUTO )
1298                 avctx->idct_algo = FF_IDCT_SIMPLE;
1299
1300         //quantization matrixes may need reordering
1301         //if dct permutation is changed
1302         memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1303
1304         if (MPV_common_init(s) < 0)
1305             return -2;
1306
1307         quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
1308         quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
1309         quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1310         quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1311
1312         s1->mpeg_enc_ctx_allocated = 1;
1313     }
1314     return 0;
1315 }
1316
1317 static int mpeg1_decode_picture(AVCodecContext *avctx,
1318                                 const uint8_t *buf, int buf_size)
1319 {
1320     Mpeg1Context *s1 = avctx->priv_data;
1321     MpegEncContext *s = &s1->mpeg_enc_ctx;
1322     int ref, f_code, vbv_delay;
1323
1324     if(mpeg_decode_postinit(s->avctx) < 0)
1325        return -2;
1326
1327     init_get_bits(&s->gb, buf, buf_size*8);
1328
1329     ref = get_bits(&s->gb, 10); /* temporal ref */
1330     s->pict_type = get_bits(&s->gb, 3);
1331     if(s->pict_type == 0 || s->pict_type > 3)
1332         return -1;
1333
1334     vbv_delay= get_bits(&s->gb, 16);
1335     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1336         s->full_pel[0] = get_bits1(&s->gb);
1337         f_code = get_bits(&s->gb, 3);
1338         if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1339             return -1;
1340         s->mpeg_f_code[0][0] = f_code;
1341         s->mpeg_f_code[0][1] = f_code;
1342     }
1343     if (s->pict_type == B_TYPE) {
1344         s->full_pel[1] = get_bits1(&s->gb);
1345         f_code = get_bits(&s->gb, 3);
1346         if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1347             return -1;
1348         s->mpeg_f_code[1][0] = f_code;
1349         s->mpeg_f_code[1][1] = f_code;
1350     }
1351     s->current_picture.pict_type= s->pict_type;
1352     s->current_picture.key_frame= s->pict_type == I_TYPE;
1353
1354     if(avctx->debug & FF_DEBUG_PICT_INFO)
1355         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1356
1357     s->y_dc_scale = 8;
1358     s->c_dc_scale = 8;
1359     s->first_slice = 1;
1360     return 0;
1361 }
1362
1363 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1364 {
1365     MpegEncContext *s= &s1->mpeg_enc_ctx;
1366     int horiz_size_ext, vert_size_ext;
1367     int bit_rate_ext;
1368
1369     skip_bits(&s->gb, 1); /* profil and level esc*/
1370     s->avctx->profile= get_bits(&s->gb, 3);
1371     s->avctx->level= get_bits(&s->gb, 4);
1372     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1373     s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1374     horiz_size_ext = get_bits(&s->gb, 2);
1375     vert_size_ext = get_bits(&s->gb, 2);
1376     s->width |= (horiz_size_ext << 12);
1377     s->height |= (vert_size_ext << 12);
1378     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1379     s->bit_rate += (bit_rate_ext << 18) * 400;
1380     skip_bits1(&s->gb); /* marker */
1381     s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1382
1383     s->low_delay = get_bits1(&s->gb);
1384     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1385
1386     s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1387     s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1388
1389     dprintf(s->avctx, "sequence extension\n");
1390     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1391     s->avctx->sub_id = 2; /* indicates mpeg2 found */
1392
1393     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1394         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1395                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1396
1397 }
1398
1399 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1400 {
1401     MpegEncContext *s= &s1->mpeg_enc_ctx;
1402     int color_description, w, h;
1403
1404     skip_bits(&s->gb, 3); /* video format */
1405     color_description= get_bits1(&s->gb);
1406     if(color_description){
1407         skip_bits(&s->gb, 8); /* color primaries */
1408         skip_bits(&s->gb, 8); /* transfer_characteristics */
1409         skip_bits(&s->gb, 8); /* matrix_coefficients */
1410     }
1411     w= get_bits(&s->gb, 14);
1412     skip_bits(&s->gb, 1); //marker
1413     h= get_bits(&s->gb, 14);
1414     skip_bits(&s->gb, 1); //marker
1415
1416     s1->pan_scan.width= 16*w;
1417     s1->pan_scan.height=16*h;
1418
1419     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1420         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1421 }
1422
1423 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1424 {
1425     MpegEncContext *s= &s1->mpeg_enc_ctx;
1426     int i,nofco;
1427
1428     nofco = 1;
1429     if(s->progressive_sequence){
1430         if(s->repeat_first_field){
1431             nofco++;
1432             if(s->top_field_first)
1433                 nofco++;
1434         }
1435     }else{
1436         if(s->picture_structure == PICT_FRAME){
1437             nofco++;
1438             if(s->repeat_first_field)
1439                 nofco++;
1440         }
1441     }
1442     for(i=0; i<nofco; i++){
1443         s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1444         skip_bits(&s->gb, 1); //marker
1445         s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1446         skip_bits(&s->gb, 1); //marker
1447     }
1448
1449     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1450         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1451             s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1452             s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1453             s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1454         );
1455 }
1456
1457 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1458 {
1459     int i, v, j;
1460
1461     dprintf(s->avctx, "matrix extension\n");
1462
1463     if (get_bits1(&s->gb)) {
1464         for(i=0;i<64;i++) {
1465             v = get_bits(&s->gb, 8);
1466             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1467             s->intra_matrix[j] = v;
1468             s->chroma_intra_matrix[j] = v;
1469         }
1470     }
1471     if (get_bits1(&s->gb)) {
1472         for(i=0;i<64;i++) {
1473             v = get_bits(&s->gb, 8);
1474             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1475             s->inter_matrix[j] = v;
1476             s->chroma_inter_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_intra_matrix[j] = v;
1484         }
1485     }
1486     if (get_bits1(&s->gb)) {
1487         for(i=0;i<64;i++) {
1488             v = get_bits(&s->gb, 8);
1489             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1490             s->chroma_inter_matrix[j] = v;
1491         }
1492     }
1493 }
1494
1495 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1496 {
1497     s->full_pel[0] = s->full_pel[1] = 0;
1498     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1499     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1500     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1501     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1502     s->intra_dc_precision = get_bits(&s->gb, 2);
1503     s->picture_structure = get_bits(&s->gb, 2);
1504     s->top_field_first = get_bits1(&s->gb);
1505     s->frame_pred_frame_dct = get_bits1(&s->gb);
1506     s->concealment_motion_vectors = get_bits1(&s->gb);
1507     s->q_scale_type = get_bits1(&s->gb);
1508     s->intra_vlc_format = get_bits1(&s->gb);
1509     s->alternate_scan = get_bits1(&s->gb);
1510     s->repeat_first_field = get_bits1(&s->gb);
1511     s->chroma_420_type = get_bits1(&s->gb);
1512     s->progressive_frame = get_bits1(&s->gb);
1513
1514     if(s->picture_structure == PICT_FRAME){
1515         s->first_field=0;
1516         s->v_edge_pos= 16*s->mb_height;
1517     }else{
1518         s->first_field ^= 1;
1519         s->v_edge_pos=  8*s->mb_height;
1520         memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1521     }
1522
1523     if(s->alternate_scan){
1524         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
1525         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
1526     }else{
1527         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
1528         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
1529     }
1530
1531     /* composite display not parsed */
1532     dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1533     dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1534     dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1535     dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1536     dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1537     dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1538     dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1539     dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1540     dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1541 }
1542
1543 static void mpeg_decode_extension(AVCodecContext *avctx,
1544                                   const uint8_t *buf, int buf_size)
1545 {
1546     Mpeg1Context *s1 = avctx->priv_data;
1547     MpegEncContext *s = &s1->mpeg_enc_ctx;
1548     int ext_type;
1549
1550     init_get_bits(&s->gb, buf, buf_size*8);
1551
1552     ext_type = get_bits(&s->gb, 4);
1553     switch(ext_type) {
1554     case 0x1:
1555         mpeg_decode_sequence_extension(s1);
1556         break;
1557     case 0x2:
1558         mpeg_decode_sequence_display_extension(s1);
1559         break;
1560     case 0x3:
1561         mpeg_decode_quant_matrix_extension(s);
1562         break;
1563     case 0x7:
1564         mpeg_decode_picture_display_extension(s1);
1565         break;
1566     case 0x8:
1567         mpeg_decode_picture_coding_extension(s);
1568         break;
1569     }
1570 }
1571
1572 static void exchange_uv(MpegEncContext *s){
1573     short * tmp = s->pblocks[4];
1574     s->pblocks[4] = s->pblocks[5];
1575     s->pblocks[5] = tmp;
1576 }
1577
1578 static int mpeg_field_start(MpegEncContext *s){
1579     AVCodecContext *avctx= s->avctx;
1580     Mpeg1Context *s1 = (Mpeg1Context*)s;
1581
1582     /* start frame decoding */
1583     if(s->first_field || s->picture_structure==PICT_FRAME){
1584         if(MPV_frame_start(s, avctx) < 0)
1585             return -1;
1586
1587         ff_er_frame_start(s);
1588
1589         /* first check if we must repeat the frame */
1590         s->current_picture_ptr->repeat_pict = 0;
1591         if (s->repeat_first_field) {
1592             if (s->progressive_sequence) {
1593                 if (s->top_field_first)
1594                     s->current_picture_ptr->repeat_pict = 4;
1595                 else
1596                     s->current_picture_ptr->repeat_pict = 2;
1597             } else if (s->progressive_frame) {
1598                 s->current_picture_ptr->repeat_pict = 1;
1599             }
1600         }
1601
1602         *s->current_picture_ptr->pan_scan= s1->pan_scan;
1603     }else{ //second field
1604             int i;
1605
1606             if(!s->current_picture_ptr){
1607                 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1608                 return -1;
1609             }
1610
1611             for(i=0; i<4; i++){
1612                 s->current_picture.data[i] = s->current_picture_ptr->data[i];
1613                 if(s->picture_structure == PICT_BOTTOM_FIELD){
1614                     s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1615                 }
1616             }
1617     }
1618 #ifdef HAVE_XVMC
1619 // MPV_frame_start will call this function too,
1620 // but we need to call it on every field
1621     if(s->avctx->xvmc_acceleration)
1622          XVMC_field_start(s,avctx);
1623 #endif
1624
1625     return 0;
1626 }
1627
1628 #define DECODE_SLICE_ERROR -1
1629 #define DECODE_SLICE_OK 0
1630
1631 /**
1632  * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1633  * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1634  *         DECODE_SLICE_OK if this slice is ok<br>
1635  */
1636 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1637                              const uint8_t **buf, int buf_size)
1638 {
1639     MpegEncContext *s = &s1->mpeg_enc_ctx;
1640     AVCodecContext *avctx= s->avctx;
1641     const int field_pic= s->picture_structure != PICT_FRAME;
1642     const int lowres= s->avctx->lowres;
1643
1644     s->resync_mb_x=
1645     s->resync_mb_y= -1;
1646
1647     if (mb_y<<field_pic >= s->mb_height){
1648         av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
1649         return -1;
1650     }
1651
1652     init_get_bits(&s->gb, *buf, buf_size*8);
1653
1654     ff_mpeg1_clean_buffers(s);
1655     s->interlaced_dct = 0;
1656
1657     s->qscale = get_qscale(s);
1658
1659     if(s->qscale == 0){
1660         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1661         return -1;
1662     }
1663
1664     /* extra slice info */
1665     while (get_bits1(&s->gb) != 0) {
1666         skip_bits(&s->gb, 8);
1667     }
1668
1669     s->mb_x=0;
1670
1671     for(;;) {
1672         int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1673         if (code < 0){
1674             av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1675             return -1;
1676         }
1677         if (code >= 33) {
1678             if (code == 33) {
1679                 s->mb_x += 33;
1680             }
1681             /* otherwise, stuffing, nothing to do */
1682         } else {
1683             s->mb_x += code;
1684             break;
1685         }
1686     }
1687     if(s->mb_x >= (unsigned)s->mb_width){
1688         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1689         return -1;
1690     }
1691
1692     s->resync_mb_x= s->mb_x;
1693     s->resync_mb_y= s->mb_y= mb_y;
1694     s->mb_skip_run= 0;
1695     ff_init_block_index(s);
1696
1697     if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1698         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1699              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",
1700                  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],
1701                  s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
1702                  s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1703                  s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1704                  s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1705         }
1706     }
1707
1708     for(;;) {
1709 #ifdef HAVE_XVMC
1710         //one 1 we memcpy blocks in xvmcvideo
1711         if(s->avctx->xvmc_acceleration > 1)
1712             XVMC_init_block(s);//set s->block
1713 #endif
1714
1715         if(mpeg_decode_mb(s, s->block) < 0)
1716             return -1;
1717
1718         if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1719             const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
1720             int xy = s->mb_x*2 + s->mb_y*2*wrap;
1721             int motion_x, motion_y, dir, i;
1722             if(field_pic && !s->first_field)
1723                 xy += wrap/2;
1724
1725             for(i=0; i<2; i++){
1726                 for(dir=0; dir<2; dir++){
1727                     if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
1728                         motion_x = motion_y = 0;
1729                     }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1730                         motion_x = s->mv[dir][0][0];
1731                         motion_y = s->mv[dir][0][1];
1732                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1733                         motion_x = s->mv[dir][i][0];
1734                         motion_y = s->mv[dir][i][1];
1735                     }
1736
1737                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1738                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1739                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1740                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1741                     s->current_picture.ref_index [dir][xy    ]=
1742                     s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
1743                     assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1744                 }
1745                 xy += wrap;
1746             }
1747         }
1748
1749         s->dest[0] += 16 >> lowres;
1750         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1751         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1752
1753         MPV_decode_mb(s, s->block);
1754
1755         if (++s->mb_x >= s->mb_width) {
1756             const int mb_size= 16>>s->avctx->lowres;
1757
1758             ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
1759
1760             s->mb_x = 0;
1761             s->mb_y++;
1762
1763             if(s->mb_y<<field_pic >= s->mb_height){
1764                 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
1765                 int is_d10= s->chroma_format==2 && s->pict_type==I_TYPE && avctx->profile==0 && avctx->level==5
1766                             && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1767                             && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1768
1769                 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1770                    || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
1771                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1772                     return -1;
1773                 }else
1774                     goto eos;
1775             }
1776
1777             ff_init_block_index(s);
1778         }
1779
1780         /* skip mb handling */
1781         if (s->mb_skip_run == -1) {
1782             /* read again increment */
1783             s->mb_skip_run = 0;
1784             for(;;) {
1785                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1786                 if (code < 0){
1787                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1788                     return -1;
1789                 }
1790                 if (code >= 33) {
1791                     if (code == 33) {
1792                         s->mb_skip_run += 33;
1793                     }else if(code == 35){
1794                         if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1795                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1796                             return -1;
1797                         }
1798                         goto eos; /* end of slice */
1799                     }
1800                     /* otherwise, stuffing, nothing to do */
1801                 } else {
1802                     s->mb_skip_run += code;
1803                     break;
1804                 }
1805             }
1806             if(s->mb_skip_run){
1807                 int i;
1808                 if(s->pict_type == I_TYPE){
1809                     av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1810                     return -1;
1811                 }
1812
1813                 /* skip mb */
1814                 s->mb_intra = 0;
1815                 for(i=0;i<12;i++)
1816                     s->block_last_index[i] = -1;
1817                 if(s->picture_structure == PICT_FRAME)
1818                     s->mv_type = MV_TYPE_16X16;
1819                 else
1820                     s->mv_type = MV_TYPE_FIELD;
1821                 if (s->pict_type == P_TYPE) {
1822                     /* if P type, zero motion vector is implied */
1823                     s->mv_dir = MV_DIR_FORWARD;
1824                     s->mv[0][0][0] = s->mv[0][0][1] = 0;
1825                     s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1826                     s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1827                     s->field_select[0][0]= s->picture_structure - 1;
1828                 } else {
1829                     /* if B type, reuse previous vectors and directions */
1830                     s->mv[0][0][0] = s->last_mv[0][0][0];
1831                     s->mv[0][0][1] = s->last_mv[0][0][1];
1832                     s->mv[1][0][0] = s->last_mv[1][0][0];
1833                     s->mv[1][0][1] = s->last_mv[1][0][1];
1834                 }
1835             }
1836         }
1837     }
1838 eos: // end of slice
1839     *buf += get_bits_count(&s->gb)/8 - 1;
1840 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1841     return 0;
1842 }
1843
1844 static int slice_decode_thread(AVCodecContext *c, void *arg){
1845     MpegEncContext *s= arg;
1846     const uint8_t *buf= s->gb.buffer;
1847     int mb_y= s->start_mb_y;
1848
1849     s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
1850
1851     for(;;){
1852         uint32_t start_code;
1853         int ret;
1854
1855         ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1856         emms_c();
1857 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1858 //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);
1859         if(ret < 0){
1860             if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1861                 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);
1862         }else{
1863             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);
1864         }
1865
1866         if(s->mb_y == s->end_mb_y)
1867             return 0;
1868
1869         start_code= -1;
1870         buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1871         mb_y= start_code - SLICE_MIN_START_CODE;
1872         if(mb_y < 0 || mb_y >= s->end_mb_y)
1873             return -1;
1874     }
1875
1876     return 0; //not reached
1877 }
1878
1879 /**
1880  * handles slice ends.
1881  * @return 1 if it seems to be the last slice of
1882  */
1883 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1884 {
1885     Mpeg1Context *s1 = avctx->priv_data;
1886     MpegEncContext *s = &s1->mpeg_enc_ctx;
1887
1888     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1889         return 0;
1890
1891 #ifdef HAVE_XVMC
1892     if(s->avctx->xvmc_acceleration)
1893         XVMC_field_end(s);
1894 #endif
1895     /* end of slice reached */
1896     if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1897         /* end of image */
1898
1899         s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1900
1901         ff_er_frame_end(s);
1902
1903         MPV_frame_end(s);
1904
1905         if (s->pict_type == B_TYPE || s->low_delay) {
1906             *pict= *(AVFrame*)s->current_picture_ptr;
1907             ff_print_debug_info(s, pict);
1908         } else {
1909             s->picture_number++;
1910             /* latency of 1 frame for I and P frames */
1911             /* XXX: use another variable than picture_number */
1912             if (s->last_picture_ptr != NULL) {
1913                 *pict= *(AVFrame*)s->last_picture_ptr;
1914                  ff_print_debug_info(s, pict);
1915             }
1916         }
1917
1918         return 1;
1919     } else {
1920         return 0;
1921     }
1922 }
1923
1924 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1925                                  const uint8_t *buf, int buf_size)
1926 {
1927     Mpeg1Context *s1 = avctx->priv_data;
1928     MpegEncContext *s = &s1->mpeg_enc_ctx;
1929     int width,height;
1930     int i, v, j;
1931
1932     init_get_bits(&s->gb, buf, buf_size*8);
1933
1934     width = get_bits(&s->gb, 12);
1935     height = get_bits(&s->gb, 12);
1936     if (width <= 0 || height <= 0 ||
1937         (width % 2) != 0 || (height % 2) != 0)
1938         return -1;
1939     s->aspect_ratio_info= get_bits(&s->gb, 4);
1940     if (s->aspect_ratio_info == 0)
1941         return -1;
1942     s->frame_rate_index = get_bits(&s->gb, 4);
1943     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1944         return -1;
1945     s->bit_rate = get_bits(&s->gb, 18) * 400;
1946     if (get_bits1(&s->gb) == 0) /* marker */
1947         return -1;
1948     s->width = width;
1949     s->height = height;
1950
1951     s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
1952     skip_bits(&s->gb, 1);
1953
1954     /* get matrix */
1955     if (get_bits1(&s->gb)) {
1956         for(i=0;i<64;i++) {
1957             v = get_bits(&s->gb, 8);
1958             if(v==0){
1959                 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
1960                 return -1;
1961             }
1962             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1963             s->intra_matrix[j] = v;
1964             s->chroma_intra_matrix[j] = v;
1965         }
1966 #ifdef DEBUG
1967         dprintf(s->avctx, "intra matrix present\n");
1968         for(i=0;i<64;i++)
1969             dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
1970         dprintf(s->avctx, "\n");
1971 #endif
1972     } else {
1973         for(i=0;i<64;i++) {
1974             j = s->dsp.idct_permutation[i];
1975             v = ff_mpeg1_default_intra_matrix[i];
1976             s->intra_matrix[j] = v;
1977             s->chroma_intra_matrix[j] = v;
1978         }
1979     }
1980     if (get_bits1(&s->gb)) {
1981         for(i=0;i<64;i++) {
1982             v = get_bits(&s->gb, 8);
1983             if(v==0){
1984                 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
1985                 return -1;
1986             }
1987             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1988             s->inter_matrix[j] = v;
1989             s->chroma_inter_matrix[j] = v;
1990         }
1991 #ifdef DEBUG
1992         dprintf(s->avctx, "non intra matrix present\n");
1993         for(i=0;i<64;i++)
1994             dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
1995         dprintf(s->avctx, "\n");
1996 #endif
1997     } else {
1998         for(i=0;i<64;i++) {
1999             int j= s->dsp.idct_permutation[i];
2000             v = ff_mpeg1_default_non_intra_matrix[i];
2001             s->inter_matrix[j] = v;
2002             s->chroma_inter_matrix[j] = v;
2003         }
2004     }
2005
2006     if(show_bits(&s->gb, 23) != 0){
2007         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2008         return -1;
2009     }
2010
2011     /* we set mpeg2 parameters so that it emulates mpeg1 */
2012     s->progressive_sequence = 1;
2013     s->progressive_frame = 1;
2014     s->picture_structure = PICT_FRAME;
2015     s->frame_pred_frame_dct = 1;
2016     s->chroma_format = 1;
2017     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2018     avctx->sub_id = 1; /* indicates mpeg1 */
2019     s->out_format = FMT_MPEG1;
2020     s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2021     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2022
2023     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2024         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2025                s->avctx->rc_buffer_size, s->bit_rate);
2026
2027     return 0;
2028 }
2029
2030 static int vcr2_init_sequence(AVCodecContext *avctx)
2031 {
2032     Mpeg1Context *s1 = avctx->priv_data;
2033     MpegEncContext *s = &s1->mpeg_enc_ctx;
2034     int i, v;
2035
2036     /* start new mpeg1 context decoding */
2037     s->out_format = FMT_MPEG1;
2038     if (s1->mpeg_enc_ctx_allocated) {
2039         MPV_common_end(s);
2040     }
2041     s->width  = avctx->coded_width;
2042     s->height = avctx->coded_height;
2043     avctx->has_b_frames= 0; //true?
2044     s->low_delay= 1;
2045
2046     if(avctx->xvmc_acceleration){
2047         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2048     }else{
2049         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2050     }
2051
2052     if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2053         if( avctx->idct_algo == FF_IDCT_AUTO )
2054             avctx->idct_algo = FF_IDCT_SIMPLE;
2055
2056     if (MPV_common_init(s) < 0)
2057         return -1;
2058     exchange_uv(s);//common init reset pblocks, so we swap them here
2059     s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2060     s1->mpeg_enc_ctx_allocated = 1;
2061
2062     for(i=0;i<64;i++) {
2063         int j= s->dsp.idct_permutation[i];
2064         v = ff_mpeg1_default_intra_matrix[i];
2065         s->intra_matrix[j] = v;
2066         s->chroma_intra_matrix[j] = v;
2067
2068         v = ff_mpeg1_default_non_intra_matrix[i];
2069         s->inter_matrix[j] = v;
2070         s->chroma_inter_matrix[j] = v;
2071     }
2072
2073     s->progressive_sequence = 1;
2074     s->progressive_frame = 1;
2075     s->picture_structure = PICT_FRAME;
2076     s->frame_pred_frame_dct = 1;
2077     s->chroma_format = 1;
2078     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2079     avctx->sub_id = 2; /* indicates mpeg2 */
2080     return 0;
2081 }
2082
2083
2084 static void mpeg_decode_user_data(AVCodecContext *avctx,
2085                                   const uint8_t *buf, int buf_size)
2086 {
2087     const uint8_t *p;
2088     int len, flags;
2089     p = buf;
2090     len = buf_size;
2091
2092     /* we parse the DTG active format information */
2093     if (len >= 5 &&
2094         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2095         flags = p[4];
2096         p += 5;
2097         len -= 5;
2098         if (flags & 0x80) {
2099             /* skip event id */
2100             if (len < 2)
2101                 return;
2102             p += 2;
2103             len -= 2;
2104         }
2105         if (flags & 0x40) {
2106             if (len < 1)
2107                 return;
2108             avctx->dtg_active_format = p[0] & 0x0f;
2109         }
2110     }
2111 }
2112
2113 static void mpeg_decode_gop(AVCodecContext *avctx,
2114                             const uint8_t *buf, int buf_size){
2115     Mpeg1Context *s1 = avctx->priv_data;
2116     MpegEncContext *s = &s1->mpeg_enc_ctx;
2117
2118     int drop_frame_flag;
2119     int time_code_hours, time_code_minutes;
2120     int time_code_seconds, time_code_pictures;
2121     int broken_link;
2122
2123     init_get_bits(&s->gb, buf, buf_size*8);
2124
2125     drop_frame_flag = get_bits1(&s->gb);
2126
2127     time_code_hours=get_bits(&s->gb,5);
2128     time_code_minutes = get_bits(&s->gb,6);
2129     skip_bits1(&s->gb);//marker bit
2130     time_code_seconds = get_bits(&s->gb,6);
2131     time_code_pictures = get_bits(&s->gb,6);
2132
2133     /*broken_link indicate that after editing the
2134       reference frames of the first B-Frames after GOP I-Frame
2135       are missing (open gop)*/
2136     broken_link = get_bits1(&s->gb);
2137
2138     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2139         av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
2140             time_code_hours, time_code_minutes, time_code_seconds,
2141             time_code_pictures, broken_link);
2142 }
2143 /**
2144  * finds the end of the current frame in the bitstream.
2145  * @return the position of the first byte of the next frame, or -1
2146  */
2147 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2148 {
2149     int i;
2150     uint32_t state= pc->state;
2151
2152     i=0;
2153     if(!pc->frame_start_found){
2154         for(i=0; i<buf_size; i++){
2155             i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2156             if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2157                 i++;
2158                 pc->frame_start_found=1;
2159                 break;
2160             }
2161         }
2162     }
2163
2164     if(pc->frame_start_found){
2165         /* EOF considered as end of frame */
2166         if (buf_size == 0)
2167             return 0;
2168         for(; i<buf_size; i++){
2169             i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2170             if((state&0xFFFFFF00) == 0x100){
2171                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2172                     pc->frame_start_found=0;
2173                     pc->state=-1;
2174                     return i-3;
2175                 }
2176             }
2177         }
2178     }
2179     pc->state= state;
2180     return END_NOT_FOUND;
2181 }
2182
2183 /* handle buffering and image synchronisation */
2184 static int mpeg_decode_frame(AVCodecContext *avctx,
2185                              void *data, int *data_size,
2186                              uint8_t *buf, int buf_size)
2187 {
2188     Mpeg1Context *s = avctx->priv_data;
2189     const uint8_t *buf_end;
2190     const uint8_t *buf_ptr;
2191     uint32_t start_code;
2192     int ret, input_size;
2193     AVFrame *picture = data;
2194     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2195     dprintf(avctx, "fill_buffer\n");
2196
2197     if (buf_size == 0) {
2198         /* special case for last picture */
2199         if (s2->low_delay==0 && s2->next_picture_ptr) {
2200             *picture= *(AVFrame*)s2->next_picture_ptr;
2201             s2->next_picture_ptr= NULL;
2202
2203             *data_size = sizeof(AVFrame);
2204         }
2205         return 0;
2206     }
2207
2208     if(s2->flags&CODEC_FLAG_TRUNCATED){
2209         int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
2210
2211         if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2212             return buf_size;
2213     }
2214
2215     buf_ptr = buf;
2216     buf_end = buf + buf_size;
2217
2218 #if 0
2219     if (s->repeat_field % 2 == 1) {
2220         s->repeat_field++;
2221         //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2222         //        s2->picture_number, s->repeat_field);
2223         if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2224             *data_size = sizeof(AVPicture);
2225             goto the_end;
2226         }
2227     }
2228 #endif
2229
2230     if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2231         vcr2_init_sequence(avctx);
2232
2233     s->slice_count= 0;
2234
2235     for(;;) {
2236         /* find start next code */
2237         start_code = -1;
2238         buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2239         if (start_code > 0x1ff){
2240             if(s2->pict_type != B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2241                 if(avctx->thread_count > 1){
2242                     int i;
2243
2244                     avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
2245                     for(i=0; i<s->slice_count; i++)
2246                         s2->error_count += s2->thread_context[i]->error_count;
2247                 }
2248                 if (slice_end(avctx, picture)) {
2249                     if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2250                         *data_size = sizeof(AVPicture);
2251                 }
2252             }
2253             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2254         }
2255
2256         input_size = buf_end - buf_ptr;
2257
2258         if(avctx->debug & FF_DEBUG_STARTCODE){
2259             av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
2260         }
2261
2262         /* prepare data for next start code */
2263         switch(start_code) {
2264         case SEQ_START_CODE:
2265             mpeg1_decode_sequence(avctx, buf_ptr,
2266                                     input_size);
2267             break;
2268
2269         case PICTURE_START_CODE:
2270             /* we have a complete image : we try to decompress it */
2271             mpeg1_decode_picture(avctx,
2272                                     buf_ptr, input_size);
2273             break;
2274         case EXT_START_CODE:
2275             mpeg_decode_extension(avctx,
2276                                     buf_ptr, input_size);
2277             break;
2278         case USER_START_CODE:
2279             mpeg_decode_user_data(avctx,
2280                                     buf_ptr, input_size);
2281             break;
2282         case GOP_START_CODE:
2283             s2->first_field=0;
2284             mpeg_decode_gop(avctx,
2285                                     buf_ptr, input_size);
2286             break;
2287         default:
2288             if (start_code >= SLICE_MIN_START_CODE &&
2289                 start_code <= SLICE_MAX_START_CODE) {
2290                 int mb_y= start_code - SLICE_MIN_START_CODE;
2291
2292                 if(s2->last_picture_ptr==NULL){
2293                 /* Skip B-frames if we do not have reference frames. */
2294                     if(s2->pict_type==B_TYPE) break;
2295                 /* Skip P-frames if we do not have reference frame no valid header. */
2296 //                    if(s2->pict_type==P_TYPE && s2->first_field && !s2->first_slice) break;
2297                 }
2298                 /* Skip B-frames if we are in a hurry. */
2299                 if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2300                 if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==B_TYPE)
2301                     ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=I_TYPE)
2302                     || avctx->skip_frame >= AVDISCARD_ALL)
2303                     break;
2304                 /* Skip everything if we are in a hurry>=5. */
2305                 if(avctx->hurry_up>=5) break;
2306
2307                 if (!s->mpeg_enc_ctx_allocated) break;
2308
2309                 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2310                     if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2311                         break;
2312                 }
2313
2314                 if(s2->first_slice){
2315                     s2->first_slice=0;
2316                             if(mpeg_field_start(s2) < 0)
2317                         return -1;
2318                     }
2319                 if(!s2->current_picture_ptr){
2320                     av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2321                     return -1;
2322                 }
2323
2324                 if(avctx->thread_count > 1){
2325                     int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2326                     if(threshold <= mb_y){
2327                         MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2328
2329                         thread_context->start_mb_y= mb_y;
2330                         thread_context->end_mb_y  = s2->mb_height;
2331                         if(s->slice_count){
2332                             s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2333                             ff_update_duplicate_context(thread_context, s2);
2334                         }
2335                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2336                         s->slice_count++;
2337                     }
2338                     buf_ptr += 2; //FIXME add minimum num of bytes per slice
2339                 }else{
2340                     ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2341                     emms_c();
2342
2343                     if(ret < 0){
2344                         if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2345                             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);
2346                     }else{
2347                         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);
2348                     }
2349                 }
2350             }
2351             break;
2352         }
2353     }
2354 }
2355
2356 static int mpeg_decode_end(AVCodecContext *avctx)
2357 {
2358     Mpeg1Context *s = avctx->priv_data;
2359
2360     if (s->mpeg_enc_ctx_allocated)
2361         MPV_common_end(&s->mpeg_enc_ctx);
2362     return 0;
2363 }
2364
2365 AVCodec mpeg1video_decoder = {
2366     "mpeg1video",
2367     CODEC_TYPE_VIDEO,
2368     CODEC_ID_MPEG1VIDEO,
2369     sizeof(Mpeg1Context),
2370     mpeg_decode_init,
2371     NULL,
2372     mpeg_decode_end,
2373     mpeg_decode_frame,
2374     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2375     .flush= ff_mpeg_flush,
2376 };
2377
2378 AVCodec mpeg2video_decoder = {
2379     "mpeg2video",
2380     CODEC_TYPE_VIDEO,
2381     CODEC_ID_MPEG2VIDEO,
2382     sizeof(Mpeg1Context),
2383     mpeg_decode_init,
2384     NULL,
2385     mpeg_decode_end,
2386     mpeg_decode_frame,
2387     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2388     .flush= ff_mpeg_flush,
2389 };
2390
2391 //legacy decoder
2392 AVCodec mpegvideo_decoder = {
2393     "mpegvideo",
2394     CODEC_TYPE_VIDEO,
2395     CODEC_ID_MPEG2VIDEO,
2396     sizeof(Mpeg1Context),
2397     mpeg_decode_init,
2398     NULL,
2399     mpeg_decode_end,
2400     mpeg_decode_frame,
2401     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2402     .flush= ff_mpeg_flush,
2403 };
2404
2405 #ifdef HAVE_XVMC
2406 static int mpeg_mc_decode_init(AVCodecContext *avctx){
2407     Mpeg1Context *s;
2408
2409     if( avctx->thread_count > 1)
2410         return -1;
2411     if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2412         return -1;
2413     if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2414         dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2415     }
2416     mpeg_decode_init(avctx);
2417     s = avctx->priv_data;
2418
2419     avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2420     avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2421
2422     return 0;
2423 }
2424
2425 AVCodec mpeg_xvmc_decoder = {
2426     "mpegvideo_xvmc",
2427     CODEC_TYPE_VIDEO,
2428     CODEC_ID_MPEG2VIDEO_XVMC,
2429     sizeof(Mpeg1Context),
2430     mpeg_mc_decode_init,
2431     NULL,
2432     mpeg_decode_end,
2433     mpeg_decode_frame,
2434     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2435     .flush= ff_mpeg_flush,
2436 };
2437
2438 #endif
2439
2440 /* this is ugly i know, but the alternative is too make
2441    hundreds of vars global and prefix them with ff_mpeg1_
2442    which is far uglier. */
2443 #include "mdec.c"