22659e3142659358d00805eddc502ea019ab7804
[ffmpeg.git] / libavcodec / mpeg12.c
1 /*
2  * MPEG1/2 decoder
3  * Copyright (c) 2000,2001 Fabrice Bellard.
4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22
23 /**
24  * @file mpeg12.c
25  * MPEG1/2 decoder
26  */
27
28 //#define DEBUG
29 #include "avcodec.h"
30 #include "dsputil.h"
31 #include "mpegvideo.h"
32
33 #include "mpeg12.h"
34 #include "mpeg12data.h"
35 #include "mpeg12decdata.h"
36 #include "bytestream.h"
37
38 //#undef NDEBUG
39 //#include <assert.h>
40
41
42 #define DC_VLC_BITS 9
43 #define MV_VLC_BITS 9
44 #define MBINCR_VLC_BITS 9
45 #define MB_PAT_VLC_BITS 9
46 #define MB_PTYPE_VLC_BITS 6
47 #define MB_BTYPE_VLC_BITS 6
48 #define TEX_VLC_BITS 9
49
50 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
51                               DCTELEM *block,
52                               int n);
53 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
54                               DCTELEM *block,
55                               int n);
56 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
57 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
58                                         DCTELEM *block,
59                                         int n);
60 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
61                                     DCTELEM *block,
62                                     int n);
63 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
64 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
65 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
66 static void exchange_uv(MpegEncContext *s);
67
68 extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
69 extern int XVMC_field_end(MpegEncContext *s);
70 extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
71 extern void XVMC_init_block(MpegEncContext *s);//set s->block
72
73 static const enum PixelFormat pixfmt_yuv_420[]= {PIX_FMT_YUV420P,-1};
74 static const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,-1};
75 static const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,-1};
76 static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
77                                            PIX_FMT_XVMC_MPEG2_IDCT,
78                                            PIX_FMT_XVMC_MPEG2_MC,
79                                            -1};
80
81 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
82
83 static void init_2d_vlc_rl(RLTable *rl, int use_static)
84 {
85     int i;
86
87     init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2,
88              &rl->table_vlc[0][1], 4, 2,
89              &rl->table_vlc[0][0], 4, 2, use_static);
90
91     if(use_static)
92         rl->rl_vlc[0]= av_mallocz_static(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
93     else
94         rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
95
96     for(i=0; i<rl->vlc.table_size; i++){
97         int code= rl->vlc.table[i][0];
98         int len = rl->vlc.table[i][1];
99         int level, run;
100
101         if(len==0){ // illegal code
102             run= 65;
103             level= MAX_LEVEL;
104         }else if(len<0){ //more bits needed
105             run= 0;
106             level= code;
107         }else{
108             if(code==rl->n){ //esc
109                 run= 65;
110                 level= 0;
111             }else if(code==rl->n+1){ //eob
112                 run= 0;
113                 level= 127;
114             }else{
115                 run=   rl->table_run  [code] + 1;
116                 level= rl->table_level[code];
117             }
118         }
119         rl->rl_vlc[0][i].len= len;
120         rl->rl_vlc[0][i].level= level;
121         rl->rl_vlc[0][i].run= run;
122     }
123 }
124
125 void ff_mpeg12_common_init(MpegEncContext *s)
126 {
127
128     s->y_dc_scale_table=
129     s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
130
131 }
132
133 void ff_mpeg1_clean_buffers(MpegEncContext *s){
134     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
135     s->last_dc[1] = s->last_dc[0];
136     s->last_dc[2] = s->last_dc[0];
137     memset(s->last_mv, 0, sizeof(s->last_mv));
138 }
139
140
141 /******************************************/
142 /* decoding */
143
144 static VLC dc_lum_vlc;
145 static VLC dc_chroma_vlc;
146 static VLC mv_vlc;
147 static VLC mbincr_vlc;
148 static VLC mb_ptype_vlc;
149 static VLC mb_btype_vlc;
150 static VLC mb_pat_vlc;
151
152 static void init_vlcs(void)
153 {
154     static int done = 0;
155
156     if (!done) {
157         done = 1;
158
159         init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
160                  ff_mpeg12_vlc_dc_lum_bits, 1, 1,
161                  ff_mpeg12_vlc_dc_lum_code, 2, 2, 1);
162         init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12,
163                  ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
164                  ff_mpeg12_vlc_dc_chroma_code, 2, 2, 1);
165         init_vlc(&mv_vlc, MV_VLC_BITS, 17,
166                  &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
167                  &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 1);
168         init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
169                  &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
170                  &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 1);
171         init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
172                  &ff_mpeg12_mbPatTable[0][1], 2, 1,
173                  &ff_mpeg12_mbPatTable[0][0], 2, 1, 1);
174
175         init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
176                  &table_mb_ptype[0][1], 2, 1,
177                  &table_mb_ptype[0][0], 2, 1, 1);
178         init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
179                  &table_mb_btype[0][1], 2, 1,
180                  &table_mb_btype[0][0], 2, 1, 1);
181         init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
182         init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
183
184         init_2d_vlc_rl(&ff_rl_mpeg1, 1);
185         init_2d_vlc_rl(&ff_rl_mpeg2, 1);
186     }
187 }
188
189 static inline int get_dmv(MpegEncContext *s)
190 {
191     if(get_bits1(&s->gb))
192         return 1 - (get_bits1(&s->gb) << 1);
193     else
194         return 0;
195 }
196
197 static inline int get_qscale(MpegEncContext *s)
198 {
199     int qscale = get_bits(&s->gb, 5);
200     if (s->q_scale_type) {
201         return non_linear_qscale[qscale];
202     } else {
203         return qscale << 1;
204     }
205 }
206
207 /* motion type (for mpeg2) */
208 #define MT_FIELD 1
209 #define MT_FRAME 2
210 #define MT_16X8  2
211 #define MT_DMV   3
212
213 static int mpeg_decode_mb(MpegEncContext *s,
214                           DCTELEM block[12][64])
215 {
216     int i, j, k, cbp, val, mb_type, motion_type;
217     const int mb_block_count = 4 + (1<< s->chroma_format);
218
219     dprintf(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
220
221     assert(s->mb_skipped==0);
222
223     if (s->mb_skip_run-- != 0) {
224         if (s->pict_type == P_TYPE) {
225             s->mb_skipped = 1;
226             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
227         } else {
228             int mb_type;
229
230             if(s->mb_x)
231                 mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
232             else
233                 mb_type= s->current_picture.mb_type[ s->mb_width + (s->mb_y-1)*s->mb_stride - 1]; // FIXME not sure if this is allowed in mpeg at all,
234             if(IS_INTRA(mb_type))
235                 return -1;
236
237             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
238                 mb_type | MB_TYPE_SKIP;
239 //            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
240
241             if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
242                 s->mb_skipped = 1;
243         }
244
245         return 0;
246     }
247
248     switch(s->pict_type) {
249     default:
250     case I_TYPE:
251         if (get_bits1(&s->gb) == 0) {
252             if (get_bits1(&s->gb) == 0){
253                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
254                 return -1;
255             }
256             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
257         } else {
258             mb_type = MB_TYPE_INTRA;
259         }
260         break;
261     case P_TYPE:
262         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
263         if (mb_type < 0){
264             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
265             return -1;
266         }
267         mb_type = ptype2mb_type[ mb_type ];
268         break;
269     case B_TYPE:
270         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
271         if (mb_type < 0){
272             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
273             return -1;
274         }
275         mb_type = btype2mb_type[ mb_type ];
276         break;
277     }
278     dprintf(s->avctx, "mb_type=%x\n", mb_type);
279 //    motion_type = 0; /* avoid warning */
280     if (IS_INTRA(mb_type)) {
281         s->dsp.clear_blocks(s->block[0]);
282
283         if(!s->chroma_y_shift){
284             s->dsp.clear_blocks(s->block[6]);
285         }
286
287         /* compute dct type */
288         if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
289             !s->frame_pred_frame_dct) {
290             s->interlaced_dct = get_bits1(&s->gb);
291         }
292
293         if (IS_QUANT(mb_type))
294             s->qscale = get_qscale(s);
295
296         if (s->concealment_motion_vectors) {
297             /* just parse them */
298             if (s->picture_structure != PICT_FRAME)
299                 skip_bits1(&s->gb); /* field select */
300
301             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
302                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
303             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
304                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
305
306             skip_bits1(&s->gb); /* marker */
307         }else
308             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
309         s->mb_intra = 1;
310 #ifdef HAVE_XVMC
311         //one 1 we memcpy blocks in xvmcvideo
312         if(s->avctx->xvmc_acceleration > 1){
313             XVMC_pack_pblocks(s,-1);//inter are always full blocks
314             if(s->swap_uv){
315                 exchange_uv(s);
316             }
317         }
318 #endif
319
320         if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
321             if(s->flags2 & CODEC_FLAG2_FAST){
322                 for(i=0;i<6;i++) {
323                     mpeg2_fast_decode_block_intra(s, s->pblocks[i], i);
324                 }
325             }else{
326                 for(i=0;i<mb_block_count;i++) {
327                     if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
328                         return -1;
329                 }
330             }
331         } else {
332             for(i=0;i<6;i++) {
333                 if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
334                     return -1;
335             }
336         }
337     } else {
338         if (mb_type & MB_TYPE_ZERO_MV){
339             assert(mb_type & MB_TYPE_CBP);
340
341             s->mv_dir = MV_DIR_FORWARD;
342             if(s->picture_structure == PICT_FRAME){
343                 if(!s->frame_pred_frame_dct)
344                     s->interlaced_dct = get_bits1(&s->gb);
345                 s->mv_type = MV_TYPE_16X16;
346             }else{
347                 s->mv_type = MV_TYPE_FIELD;
348                 mb_type |= MB_TYPE_INTERLACED;
349                 s->field_select[0][0]= s->picture_structure - 1;
350             }
351
352             if (IS_QUANT(mb_type))
353                 s->qscale = get_qscale(s);
354
355             s->last_mv[0][0][0] = 0;
356             s->last_mv[0][0][1] = 0;
357             s->last_mv[0][1][0] = 0;
358             s->last_mv[0][1][1] = 0;
359             s->mv[0][0][0] = 0;
360             s->mv[0][0][1] = 0;
361         }else{
362             assert(mb_type & MB_TYPE_L0L1);
363 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
364             /* get additional motion vector type */
365             if (s->frame_pred_frame_dct)
366                 motion_type = MT_FRAME;
367             else{
368                 motion_type = get_bits(&s->gb, 2);
369                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
370                     s->interlaced_dct = get_bits1(&s->gb);
371             }
372
373             if (IS_QUANT(mb_type))
374                 s->qscale = get_qscale(s);
375
376             /* motion vectors */
377             s->mv_dir = 0;
378             dprintf(s->avctx, "motion_type=%d\n", motion_type);
379             switch(motion_type) {
380             case MT_FRAME: /* or MT_16X8 */
381                 for(i=0;i<2;i++) {
382                     if (USES_LIST(mb_type, i)) {
383                         s->mv_dir |= (MV_DIR_FORWARD >> i);
384                         if (s->picture_structure == PICT_FRAME) {
385                             /* MT_FRAME */
386                             mb_type |= MB_TYPE_16x16;
387                             s->mv_type = MV_TYPE_16X16;
388                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
389                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
390                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
391                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
392                             /* full_pel: only for mpeg1 */
393                             if (s->full_pel[i]){
394                                 s->mv[i][0][0] <<= 1;
395                                 s->mv[i][0][1] <<= 1;
396                             }
397                         } else {
398                             /* MT_16X8 */
399                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
400                             s->mv_type = MV_TYPE_16X8;
401                             for(j=0;j<2;j++) {
402                                 s->field_select[i][j] = get_bits1(&s->gb);
403                                 for(k=0;k<2;k++) {
404                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
405                                                              s->last_mv[i][j][k]);
406                                     s->last_mv[i][j][k] = val;
407                                     s->mv[i][j][k] = val;
408                                 }
409                             }
410                         }
411                     }
412                 }
413                 break;
414             case MT_FIELD:
415                 s->mv_type = MV_TYPE_FIELD;
416                 for(i=0;i<2;i++) {
417                     if (USES_LIST(mb_type, i)) {
418                         s->mv_dir |= (MV_DIR_FORWARD >> i);
419                         if (s->picture_structure == PICT_FRAME) {
420                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
421                             for(j=0;j<2;j++) {
422                                 s->field_select[i][j] = get_bits1(&s->gb);
423                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
424                                                          s->last_mv[i][j][0]);
425                                 s->last_mv[i][j][0] = val;
426                                 s->mv[i][j][0] = val;
427                                 dprintf(s->avctx, "fmx=%d\n", val);
428                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
429                                                          s->last_mv[i][j][1] >> 1);
430                                 s->last_mv[i][j][1] = val << 1;
431                                 s->mv[i][j][1] = val;
432                                 dprintf(s->avctx, "fmy=%d\n", val);
433                             }
434                         } else {
435                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
436                             s->field_select[i][0] = get_bits1(&s->gb);
437                             for(k=0;k<2;k++) {
438                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
439                                                          s->last_mv[i][0][k]);
440                                 s->last_mv[i][0][k] = val;
441                                 s->last_mv[i][1][k] = val;
442                                 s->mv[i][0][k] = val;
443                             }
444                         }
445                     }
446                 }
447                 break;
448             case MT_DMV:
449                 s->mv_type = MV_TYPE_DMV;
450                 for(i=0;i<2;i++) {
451                     if (USES_LIST(mb_type, i)) {
452                         int dmx, dmy, mx, my, m;
453                         s->mv_dir |= (MV_DIR_FORWARD >> i);
454                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
455                                                 s->last_mv[i][0][0]);
456                         s->last_mv[i][0][0] = mx;
457                         s->last_mv[i][1][0] = mx;
458                         dmx = get_dmv(s);
459                         my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
460                                                 s->last_mv[i][0][1] >> 1);
461                         dmy = get_dmv(s);
462
463
464                         s->last_mv[i][0][1] = my<<1;
465                         s->last_mv[i][1][1] = my<<1;
466
467                         s->mv[i][0][0] = mx;
468                         s->mv[i][0][1] = my;
469                         s->mv[i][1][0] = mx;//not used
470                         s->mv[i][1][1] = my;//not used
471
472                         if (s->picture_structure == PICT_FRAME) {
473                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
474
475                             //m = 1 + 2 * s->top_field_first;
476                             m = s->top_field_first ? 1 : 3;
477
478                             /* top -> top pred */
479                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
480                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
481                             m = 4 - m;
482                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
483                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
484                         } else {
485                             mb_type |= MB_TYPE_16x16;
486
487                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
488                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
489                             if(s->picture_structure == PICT_TOP_FIELD)
490                                 s->mv[i][2][1]--;
491                             else
492                                 s->mv[i][2][1]++;
493                         }
494                     }
495                 }
496                 break;
497             default:
498                 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
499                 return -1;
500             }
501         }
502
503         s->mb_intra = 0;
504         if (HAS_CBP(mb_type)) {
505             s->dsp.clear_blocks(s->block[0]);
506
507             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
508             if(mb_block_count > 6){
509                  cbp<<= mb_block_count-6;
510                  cbp |= get_bits(&s->gb, mb_block_count-6);
511                  s->dsp.clear_blocks(s->block[6]);
512             }
513             if (cbp <= 0){
514                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
515                 return -1;
516             }
517
518 #ifdef HAVE_XVMC
519             //on 1 we memcpy blocks in xvmcvideo
520             if(s->avctx->xvmc_acceleration > 1){
521                 XVMC_pack_pblocks(s,cbp);
522                 if(s->swap_uv){
523                     exchange_uv(s);
524                 }
525             }
526 #endif
527
528             if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
529                 if(s->flags2 & CODEC_FLAG2_FAST){
530                     for(i=0;i<6;i++) {
531                         if(cbp & 32) {
532                             mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
533                         } else {
534                             s->block_last_index[i] = -1;
535                         }
536                         cbp+=cbp;
537                     }
538                 }else{
539                     cbp<<= 12-mb_block_count;
540
541                     for(i=0;i<mb_block_count;i++) {
542                         if ( cbp & (1<<11) ) {
543                             if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
544                                 return -1;
545                         } else {
546                             s->block_last_index[i] = -1;
547                         }
548                         cbp+=cbp;
549                     }
550                 }
551             } else {
552                 if(s->flags2 & CODEC_FLAG2_FAST){
553                     for(i=0;i<6;i++) {
554                         if (cbp & 32) {
555                             mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
556                         } else {
557                             s->block_last_index[i] = -1;
558                         }
559                         cbp+=cbp;
560                     }
561                 }else{
562                     for(i=0;i<6;i++) {
563                         if (cbp & 32) {
564                             if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
565                                 return -1;
566                         } else {
567                             s->block_last_index[i] = -1;
568                         }
569                         cbp+=cbp;
570                     }
571                 }
572             }
573         }else{
574             for(i=0;i<12;i++)
575                 s->block_last_index[i] = -1;
576         }
577     }
578
579     s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
580
581     return 0;
582 }
583
584 /* as h263, but only 17 codes */
585 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
586 {
587     int code, sign, val, l, shift;
588
589     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
590     if (code == 0) {
591         return pred;
592     }
593     if (code < 0) {
594         return 0xffff;
595     }
596
597     sign = get_bits1(&s->gb);
598     shift = fcode - 1;
599     val = code;
600     if (shift) {
601         val = (val - 1) << shift;
602         val |= get_bits(&s->gb, shift);
603         val++;
604     }
605     if (sign)
606         val = -val;
607     val += pred;
608
609     /* modulo decoding */
610     l= INT_BIT - 5 - shift;
611     val = (val<<l)>>l;
612     return val;
613 }
614
615 static inline int decode_dc(GetBitContext *gb, int component)
616 {
617     int code, diff;
618
619     if (component == 0) {
620         code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
621     } else {
622         code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
623     }
624     if (code < 0){
625         av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
626         return 0xffff;
627     }
628     if (code == 0) {
629         diff = 0;
630     } else {
631         diff = get_xbits(gb, code);
632     }
633     return diff;
634 }
635
636 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
637                                DCTELEM *block,
638                                int n)
639 {
640     int level, dc, diff, i, j, run;
641     int component;
642     RLTable *rl = &ff_rl_mpeg1;
643     uint8_t * const scantable= s->intra_scantable.permutated;
644     const uint16_t *quant_matrix= s->intra_matrix;
645     const int qscale= s->qscale;
646
647     /* DC coef */
648     component = (n <= 3 ? 0 : n - 4 + 1);
649     diff = decode_dc(&s->gb, component);
650     if (diff >= 0xffff)
651         return -1;
652     dc = s->last_dc[component];
653     dc += diff;
654     s->last_dc[component] = dc;
655     block[0] = dc<<3;
656     dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
657     i = 0;
658     {
659         OPEN_READER(re, &s->gb);
660         /* now quantify & encode AC coefs */
661         for(;;) {
662             UPDATE_CACHE(re, &s->gb);
663             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
664
665             if(level == 127){
666                 break;
667             } else if(level != 0) {
668                 i += run;
669                 j = scantable[i];
670                 level= (level*qscale*quant_matrix[j])>>4;
671                 level= (level-1)|1;
672                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
673                 LAST_SKIP_BITS(re, &s->gb, 1);
674             } else {
675                 /* escape */
676                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
677                 UPDATE_CACHE(re, &s->gb);
678                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
679                 if (level == -128) {
680                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
681                 } else if (level == 0) {
682                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
683                 }
684                 i += run;
685                 j = scantable[i];
686                 if(level<0){
687                     level= -level;
688                     level= (level*qscale*quant_matrix[j])>>4;
689                     level= (level-1)|1;
690                     level= -level;
691                 }else{
692                     level= (level*qscale*quant_matrix[j])>>4;
693                     level= (level-1)|1;
694                 }
695             }
696             if (i > 63){
697                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
698                 return -1;
699             }
700
701             block[j] = level;
702         }
703         CLOSE_READER(re, &s->gb);
704     }
705     s->block_last_index[n] = i;
706    return 0;
707 }
708
709 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
710                                DCTELEM *block,
711                                int n)
712 {
713     int level, i, j, run;
714     RLTable *rl = &ff_rl_mpeg1;
715     uint8_t * const scantable= s->intra_scantable.permutated;
716     const uint16_t *quant_matrix= s->inter_matrix;
717     const int qscale= s->qscale;
718
719     {
720         OPEN_READER(re, &s->gb);
721         i = -1;
722         /* special case for the first coef. no need to add a second vlc table */
723         UPDATE_CACHE(re, &s->gb);
724         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
725             level= (3*qscale*quant_matrix[0])>>5;
726             level= (level-1)|1;
727             if(GET_CACHE(re, &s->gb)&0x40000000)
728                 level= -level;
729             block[0] = level;
730             i++;
731             SKIP_BITS(re, &s->gb, 2);
732             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
733                 goto end;
734         }
735
736         /* now quantify & encode AC coefs */
737         for(;;) {
738             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
739
740             if(level != 0) {
741                 i += run;
742                 j = scantable[i];
743                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
744                 level= (level-1)|1;
745                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
746                 SKIP_BITS(re, &s->gb, 1);
747             } else {
748                 /* escape */
749                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
750                 UPDATE_CACHE(re, &s->gb);
751                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
752                 if (level == -128) {
753                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
754                 } else if (level == 0) {
755                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
756                 }
757                 i += run;
758                 j = scantable[i];
759                 if(level<0){
760                     level= -level;
761                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
762                     level= (level-1)|1;
763                     level= -level;
764                 }else{
765                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
766                     level= (level-1)|1;
767                 }
768             }
769             if (i > 63){
770                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
771                 return -1;
772             }
773
774             block[j] = level;
775             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
776                 break;
777             UPDATE_CACHE(re, &s->gb);
778         }
779 end:
780         LAST_SKIP_BITS(re, &s->gb, 2);
781         CLOSE_READER(re, &s->gb);
782     }
783     s->block_last_index[n] = i;
784     return 0;
785 }
786
787 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
788 {
789     int level, i, j, run;
790     RLTable *rl = &ff_rl_mpeg1;
791     uint8_t * const scantable= s->intra_scantable.permutated;
792     const int qscale= s->qscale;
793
794     {
795         OPEN_READER(re, &s->gb);
796         i = -1;
797         /* special case for the first coef. no need to add a second vlc table */
798         UPDATE_CACHE(re, &s->gb);
799         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
800             level= (3*qscale)>>1;
801             level= (level-1)|1;
802             if(GET_CACHE(re, &s->gb)&0x40000000)
803                 level= -level;
804             block[0] = level;
805             i++;
806             SKIP_BITS(re, &s->gb, 2);
807             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
808                 goto end;
809         }
810
811         /* now quantify & encode AC coefs */
812         for(;;) {
813             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
814
815             if(level != 0) {
816                 i += run;
817                 j = scantable[i];
818                 level= ((level*2+1)*qscale)>>1;
819                 level= (level-1)|1;
820                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
821                 SKIP_BITS(re, &s->gb, 1);
822             } else {
823                 /* escape */
824                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
825                 UPDATE_CACHE(re, &s->gb);
826                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
827                 if (level == -128) {
828                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
829                 } else if (level == 0) {
830                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
831                 }
832                 i += run;
833                 j = scantable[i];
834                 if(level<0){
835                     level= -level;
836                     level= ((level*2+1)*qscale)>>1;
837                     level= (level-1)|1;
838                     level= -level;
839                 }else{
840                     level= ((level*2+1)*qscale)>>1;
841                     level= (level-1)|1;
842                 }
843             }
844
845             block[j] = level;
846             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
847                 break;
848             UPDATE_CACHE(re, &s->gb);
849         }
850 end:
851         LAST_SKIP_BITS(re, &s->gb, 2);
852         CLOSE_READER(re, &s->gb);
853     }
854     s->block_last_index[n] = i;
855     return 0;
856 }
857
858
859 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
860                                DCTELEM *block,
861                                int n)
862 {
863     int level, i, j, run;
864     RLTable *rl = &ff_rl_mpeg1;
865     uint8_t * const scantable= s->intra_scantable.permutated;
866     const uint16_t *quant_matrix;
867     const int qscale= s->qscale;
868     int mismatch;
869
870     mismatch = 1;
871
872     {
873         OPEN_READER(re, &s->gb);
874         i = -1;
875         if (n < 4)
876             quant_matrix = s->inter_matrix;
877         else
878             quant_matrix = s->chroma_inter_matrix;
879
880         /* special case for the first coef. no need to add a second vlc table */
881         UPDATE_CACHE(re, &s->gb);
882         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
883             level= (3*qscale*quant_matrix[0])>>5;
884             if(GET_CACHE(re, &s->gb)&0x40000000)
885                 level= -level;
886             block[0] = level;
887             mismatch ^= level;
888             i++;
889             SKIP_BITS(re, &s->gb, 2);
890             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
891                 goto end;
892         }
893
894         /* now quantify & encode AC coefs */
895         for(;;) {
896             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
897
898             if(level != 0) {
899                 i += run;
900                 j = scantable[i];
901                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
902                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
903                 SKIP_BITS(re, &s->gb, 1);
904             } else {
905                 /* escape */
906                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
907                 UPDATE_CACHE(re, &s->gb);
908                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
909
910                 i += run;
911                 j = scantable[i];
912                 if(level<0){
913                     level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
914                     level= -level;
915                 }else{
916                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
917                 }
918             }
919             if (i > 63){
920                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
921                 return -1;
922             }
923
924             mismatch ^= level;
925             block[j] = level;
926             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
927                 break;
928             UPDATE_CACHE(re, &s->gb);
929         }
930 end:
931         LAST_SKIP_BITS(re, &s->gb, 2);
932         CLOSE_READER(re, &s->gb);
933     }
934     block[63] ^= (mismatch & 1);
935
936     s->block_last_index[n] = i;
937     return 0;
938 }
939
940 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
941                                DCTELEM *block,
942                                int n)
943 {
944     int level, i, j, run;
945     RLTable *rl = &ff_rl_mpeg1;
946     uint8_t * const scantable= s->intra_scantable.permutated;
947     const int qscale= s->qscale;
948     OPEN_READER(re, &s->gb);
949     i = -1;
950
951     /* special case for the first coef. no need to add a second vlc table */
952     UPDATE_CACHE(re, &s->gb);
953     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
954         level= (3*qscale)>>1;
955         if(GET_CACHE(re, &s->gb)&0x40000000)
956             level= -level;
957         block[0] = level;
958         i++;
959         SKIP_BITS(re, &s->gb, 2);
960         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
961             goto end;
962     }
963
964     /* now quantify & encode AC coefs */
965     for(;;) {
966         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
967
968         if(level != 0) {
969             i += run;
970             j = scantable[i];
971             level= ((level*2+1)*qscale)>>1;
972             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
973             SKIP_BITS(re, &s->gb, 1);
974         } else {
975             /* escape */
976             run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
977             UPDATE_CACHE(re, &s->gb);
978             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
979
980             i += run;
981             j = scantable[i];
982             if(level<0){
983                 level= ((-level*2+1)*qscale)>>1;
984                 level= -level;
985             }else{
986                 level= ((level*2+1)*qscale)>>1;
987             }
988         }
989
990         block[j] = level;
991         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
992             break;
993         UPDATE_CACHE(re, &s->gb);
994     }
995 end:
996     LAST_SKIP_BITS(re, &s->gb, 2);
997     CLOSE_READER(re, &s->gb);
998     s->block_last_index[n] = i;
999     return 0;
1000 }
1001
1002
1003 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1004                                DCTELEM *block,
1005                                int n)
1006 {
1007     int level, dc, diff, i, j, run;
1008     int component;
1009     RLTable *rl;
1010     uint8_t * const scantable= s->intra_scantable.permutated;
1011     const uint16_t *quant_matrix;
1012     const int qscale= s->qscale;
1013     int mismatch;
1014
1015     /* DC coef */
1016     if (n < 4){
1017         quant_matrix = s->intra_matrix;
1018         component = 0;
1019     }else{
1020         quant_matrix = s->chroma_intra_matrix;
1021         component = (n&1) + 1;
1022     }
1023     diff = decode_dc(&s->gb, component);
1024     if (diff >= 0xffff)
1025         return -1;
1026     dc = s->last_dc[component];
1027     dc += diff;
1028     s->last_dc[component] = dc;
1029     block[0] = dc << (3 - s->intra_dc_precision);
1030     dprintf(s->avctx, "dc=%d\n", block[0]);
1031     mismatch = block[0] ^ 1;
1032     i = 0;
1033     if (s->intra_vlc_format)
1034         rl = &ff_rl_mpeg2;
1035     else
1036         rl = &ff_rl_mpeg1;
1037
1038     {
1039         OPEN_READER(re, &s->gb);
1040         /* now quantify & encode AC coefs */
1041         for(;;) {
1042             UPDATE_CACHE(re, &s->gb);
1043             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1044
1045             if(level == 127){
1046                 break;
1047             } else if(level != 0) {
1048                 i += run;
1049                 j = scantable[i];
1050                 level= (level*qscale*quant_matrix[j])>>4;
1051                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1052                 LAST_SKIP_BITS(re, &s->gb, 1);
1053             } else {
1054                 /* escape */
1055                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1056                 UPDATE_CACHE(re, &s->gb);
1057                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1058                 i += run;
1059                 j = scantable[i];
1060                 if(level<0){
1061                     level= (-level*qscale*quant_matrix[j])>>4;
1062                     level= -level;
1063                 }else{
1064                     level= (level*qscale*quant_matrix[j])>>4;
1065                 }
1066             }
1067             if (i > 63){
1068                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1069                 return -1;
1070             }
1071
1072             mismatch^= level;
1073             block[j] = level;
1074         }
1075         CLOSE_READER(re, &s->gb);
1076     }
1077     block[63]^= mismatch&1;
1078
1079     s->block_last_index[n] = i;
1080     return 0;
1081 }
1082
1083 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1084                                DCTELEM *block,
1085                                int n)
1086 {
1087     int level, dc, diff, j, run;
1088     int component;
1089     RLTable *rl;
1090     uint8_t * scantable= s->intra_scantable.permutated;
1091     const uint16_t *quant_matrix;
1092     const int qscale= s->qscale;
1093
1094     /* DC coef */
1095     if (n < 4){
1096         quant_matrix = s->intra_matrix;
1097         component = 0;
1098     }else{
1099         quant_matrix = s->chroma_intra_matrix;
1100         component = (n&1) + 1;
1101     }
1102     diff = decode_dc(&s->gb, component);
1103     if (diff >= 0xffff)
1104         return -1;
1105     dc = s->last_dc[component];
1106     dc += diff;
1107     s->last_dc[component] = dc;
1108     block[0] = dc << (3 - s->intra_dc_precision);
1109     if (s->intra_vlc_format)
1110         rl = &ff_rl_mpeg2;
1111     else
1112         rl = &ff_rl_mpeg1;
1113
1114     {
1115         OPEN_READER(re, &s->gb);
1116         /* now quantify & encode AC coefs */
1117         for(;;) {
1118             UPDATE_CACHE(re, &s->gb);
1119             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1120
1121             if(level == 127){
1122                 break;
1123             } else if(level != 0) {
1124                 scantable += run;
1125                 j = *scantable;
1126                 level= (level*qscale*quant_matrix[j])>>4;
1127                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1128                 LAST_SKIP_BITS(re, &s->gb, 1);
1129             } else {
1130                 /* escape */
1131                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1132                 UPDATE_CACHE(re, &s->gb);
1133                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1134                 scantable += run;
1135                 j = *scantable;
1136                 if(level<0){
1137                     level= (-level*qscale*quant_matrix[j])>>4;
1138                     level= -level;
1139                 }else{
1140                     level= (level*qscale*quant_matrix[j])>>4;
1141                 }
1142             }
1143
1144             block[j] = level;
1145         }
1146         CLOSE_READER(re, &s->gb);
1147     }
1148
1149     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1150     return 0;
1151 }
1152
1153 typedef struct Mpeg1Context {
1154     MpegEncContext mpeg_enc_ctx;
1155     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1156     int repeat_field; /* true if we must repeat the field */
1157     AVPanScan pan_scan; /** some temporary storage for the panscan */
1158     int slice_count;
1159     int swap_uv;//indicate VCR2
1160     int save_aspect_info;
1161     int save_width, save_height;
1162     AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
1163
1164 } Mpeg1Context;
1165
1166 static int mpeg_decode_init(AVCodecContext *avctx)
1167 {
1168     Mpeg1Context *s = avctx->priv_data;
1169     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1170     int i;
1171
1172     //we need some parmutation to store
1173     //matrixes, until MPV_common_init()
1174     //set the real permutatuon
1175     for(i=0;i<64;i++)
1176        s2->dsp.idct_permutation[i]=i;
1177
1178     MPV_decode_defaults(s2);
1179
1180     s->mpeg_enc_ctx.avctx= avctx;
1181     s->mpeg_enc_ctx.flags= avctx->flags;
1182     s->mpeg_enc_ctx.flags2= avctx->flags2;
1183     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1184     init_vlcs();
1185
1186     s->mpeg_enc_ctx_allocated = 0;
1187     s->mpeg_enc_ctx.picture_number = 0;
1188     s->repeat_field = 0;
1189     s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1190     return 0;
1191 }
1192
1193 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1194                                      const uint8_t *new_perm){
1195     uint16_t temp_matrix[64];
1196     int i;
1197
1198     memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1199
1200     for(i=0;i<64;i++){
1201         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1202     }
1203 }
1204
1205 //Call this function when we know all parameters
1206 //it may be called in different places for mpeg1 and mpeg2
1207 static int mpeg_decode_postinit(AVCodecContext *avctx){
1208     Mpeg1Context *s1 = avctx->priv_data;
1209     MpegEncContext *s = &s1->mpeg_enc_ctx;
1210     uint8_t old_permutation[64];
1211
1212     if (
1213         (s1->mpeg_enc_ctx_allocated == 0)||
1214         avctx->coded_width  != s->width ||
1215         avctx->coded_height != s->height||
1216         s1->save_width != s->width ||
1217         s1->save_height != s->height ||
1218         s1->save_aspect_info != s->aspect_ratio_info||
1219         0)
1220     {
1221
1222         if (s1->mpeg_enc_ctx_allocated) {
1223             ParseContext pc= s->parse_context;
1224             s->parse_context.buffer=0;
1225             MPV_common_end(s);
1226             s->parse_context= pc;
1227         }
1228
1229         if( (s->width == 0 )||(s->height == 0))
1230             return -2;
1231
1232         avcodec_set_dimensions(avctx, s->width, s->height);
1233         avctx->bit_rate = s->bit_rate;
1234         s1->save_aspect_info = s->aspect_ratio_info;
1235         s1->save_width = s->width;
1236         s1->save_height = s->height;
1237
1238      //low_delay may be forced, in this case we will have B frames
1239      //that behave like P frames
1240         avctx->has_b_frames = !(s->low_delay);
1241
1242         if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
1243             //mpeg1 fps
1244             avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1245             avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1246             //mpeg1 aspect
1247             avctx->sample_aspect_ratio= av_d2q(
1248                     1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1249
1250         }else{//mpeg2
1251         //mpeg2 fps
1252             av_reduce(
1253                 &s->avctx->time_base.den,
1254                 &s->avctx->time_base.num,
1255                 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1256                 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1257                 1<<30);
1258         //mpeg2 aspect
1259             if(s->aspect_ratio_info > 1){
1260                 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
1261                     s->avctx->sample_aspect_ratio=
1262                         av_div_q(
1263                          ff_mpeg2_aspect[s->aspect_ratio_info],
1264                          (AVRational){s->width, s->height}
1265                          );
1266                 }else{
1267                     s->avctx->sample_aspect_ratio=
1268                         av_div_q(
1269                          ff_mpeg2_aspect[s->aspect_ratio_info],
1270                          (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1271                         );
1272                 }
1273             }else{
1274                 s->avctx->sample_aspect_ratio=
1275                     ff_mpeg2_aspect[s->aspect_ratio_info];
1276             }
1277         }//mpeg2
1278
1279         if(avctx->xvmc_acceleration){
1280             avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1281         }else{
1282             if(s->chroma_format <  2){
1283                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
1284             }else
1285             if(s->chroma_format == 2){
1286                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
1287             }else
1288             if(s->chroma_format >  2){
1289                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
1290             }
1291         }
1292         //until then pix_fmt may be changed right after codec init
1293         if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
1294             if( avctx->idct_algo == FF_IDCT_AUTO )
1295                 avctx->idct_algo = FF_IDCT_SIMPLE;
1296
1297         //quantization matrixes may need reordering
1298         //if dct permutation is changed
1299         memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1300
1301         if (MPV_common_init(s) < 0)
1302             return -2;
1303
1304         quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
1305         quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
1306         quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1307         quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1308
1309         s1->mpeg_enc_ctx_allocated = 1;
1310     }
1311     return 0;
1312 }
1313
1314 static int mpeg1_decode_picture(AVCodecContext *avctx,
1315                                 const uint8_t *buf, int buf_size)
1316 {
1317     Mpeg1Context *s1 = avctx->priv_data;
1318     MpegEncContext *s = &s1->mpeg_enc_ctx;
1319     int ref, f_code, vbv_delay;
1320
1321     if(mpeg_decode_postinit(s->avctx) < 0)
1322        return -2;
1323
1324     init_get_bits(&s->gb, buf, buf_size*8);
1325
1326     ref = get_bits(&s->gb, 10); /* temporal ref */
1327     s->pict_type = get_bits(&s->gb, 3);
1328     if(s->pict_type == 0 || s->pict_type > 3)
1329         return -1;
1330
1331     vbv_delay= get_bits(&s->gb, 16);
1332     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1333         s->full_pel[0] = get_bits1(&s->gb);
1334         f_code = get_bits(&s->gb, 3);
1335         if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1336             return -1;
1337         s->mpeg_f_code[0][0] = f_code;
1338         s->mpeg_f_code[0][1] = f_code;
1339     }
1340     if (s->pict_type == B_TYPE) {
1341         s->full_pel[1] = get_bits1(&s->gb);
1342         f_code = get_bits(&s->gb, 3);
1343         if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1344             return -1;
1345         s->mpeg_f_code[1][0] = f_code;
1346         s->mpeg_f_code[1][1] = f_code;
1347     }
1348     s->current_picture.pict_type= s->pict_type;
1349     s->current_picture.key_frame= s->pict_type == I_TYPE;
1350
1351     if(avctx->debug & FF_DEBUG_PICT_INFO)
1352         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1353
1354     s->y_dc_scale = 8;
1355     s->c_dc_scale = 8;
1356     s->first_slice = 1;
1357     return 0;
1358 }
1359
1360 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1361 {
1362     MpegEncContext *s= &s1->mpeg_enc_ctx;
1363     int horiz_size_ext, vert_size_ext;
1364     int bit_rate_ext;
1365
1366     skip_bits(&s->gb, 1); /* profil and level esc*/
1367     s->avctx->profile= get_bits(&s->gb, 3);
1368     s->avctx->level= get_bits(&s->gb, 4);
1369     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1370     s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1371     horiz_size_ext = get_bits(&s->gb, 2);
1372     vert_size_ext = get_bits(&s->gb, 2);
1373     s->width |= (horiz_size_ext << 12);
1374     s->height |= (vert_size_ext << 12);
1375     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1376     s->bit_rate += (bit_rate_ext << 18) * 400;
1377     skip_bits1(&s->gb); /* marker */
1378     s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1379
1380     s->low_delay = get_bits1(&s->gb);
1381     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1382
1383     s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1384     s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1385
1386     dprintf(s->avctx, "sequence extension\n");
1387     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1388     s->avctx->sub_id = 2; /* indicates mpeg2 found */
1389
1390     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1391         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1392                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1393
1394 }
1395
1396 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1397 {
1398     MpegEncContext *s= &s1->mpeg_enc_ctx;
1399     int color_description, w, h;
1400
1401     skip_bits(&s->gb, 3); /* video format */
1402     color_description= get_bits1(&s->gb);
1403     if(color_description){
1404         skip_bits(&s->gb, 8); /* color primaries */
1405         skip_bits(&s->gb, 8); /* transfer_characteristics */
1406         skip_bits(&s->gb, 8); /* matrix_coefficients */
1407     }
1408     w= get_bits(&s->gb, 14);
1409     skip_bits(&s->gb, 1); //marker
1410     h= get_bits(&s->gb, 14);
1411     skip_bits(&s->gb, 1); //marker
1412
1413     s1->pan_scan.width= 16*w;
1414     s1->pan_scan.height=16*h;
1415
1416     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1417         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1418 }
1419
1420 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1421 {
1422     MpegEncContext *s= &s1->mpeg_enc_ctx;
1423     int i,nofco;
1424
1425     nofco = 1;
1426     if(s->progressive_sequence){
1427         if(s->repeat_first_field){
1428             nofco++;
1429             if(s->top_field_first)
1430                 nofco++;
1431         }
1432     }else{
1433         if(s->picture_structure == PICT_FRAME){
1434             nofco++;
1435             if(s->repeat_first_field)
1436                 nofco++;
1437         }
1438     }
1439     for(i=0; i<nofco; i++){
1440         s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1441         skip_bits(&s->gb, 1); //marker
1442         s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1443         skip_bits(&s->gb, 1); //marker
1444     }
1445
1446     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1447         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1448             s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1449             s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1450             s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1451         );
1452 }
1453
1454 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1455 {
1456     int i, v, j;
1457
1458     dprintf(s->avctx, "matrix extension\n");
1459
1460     if (get_bits1(&s->gb)) {
1461         for(i=0;i<64;i++) {
1462             v = get_bits(&s->gb, 8);
1463             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1464             s->intra_matrix[j] = v;
1465             s->chroma_intra_matrix[j] = v;
1466         }
1467     }
1468     if (get_bits1(&s->gb)) {
1469         for(i=0;i<64;i++) {
1470             v = get_bits(&s->gb, 8);
1471             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1472             s->inter_matrix[j] = v;
1473             s->chroma_inter_matrix[j] = v;
1474         }
1475     }
1476     if (get_bits1(&s->gb)) {
1477         for(i=0;i<64;i++) {
1478             v = get_bits(&s->gb, 8);
1479             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1480             s->chroma_intra_matrix[j] = v;
1481         }
1482     }
1483     if (get_bits1(&s->gb)) {
1484         for(i=0;i<64;i++) {
1485             v = get_bits(&s->gb, 8);
1486             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1487             s->chroma_inter_matrix[j] = v;
1488         }
1489     }
1490 }
1491
1492 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1493 {
1494     s->full_pel[0] = s->full_pel[1] = 0;
1495     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1496     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1497     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1498     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1499     s->intra_dc_precision = get_bits(&s->gb, 2);
1500     s->picture_structure = get_bits(&s->gb, 2);
1501     s->top_field_first = get_bits1(&s->gb);
1502     s->frame_pred_frame_dct = get_bits1(&s->gb);
1503     s->concealment_motion_vectors = get_bits1(&s->gb);
1504     s->q_scale_type = get_bits1(&s->gb);
1505     s->intra_vlc_format = get_bits1(&s->gb);
1506     s->alternate_scan = get_bits1(&s->gb);
1507     s->repeat_first_field = get_bits1(&s->gb);
1508     s->chroma_420_type = get_bits1(&s->gb);
1509     s->progressive_frame = get_bits1(&s->gb);
1510
1511     if(s->picture_structure == PICT_FRAME){
1512         s->first_field=0;
1513         s->v_edge_pos= 16*s->mb_height;
1514     }else{
1515         s->first_field ^= 1;
1516         s->v_edge_pos=  8*s->mb_height;
1517         memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1518     }
1519
1520     if(s->alternate_scan){
1521         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
1522         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
1523     }else{
1524         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
1525         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
1526     }
1527
1528     /* composite display not parsed */
1529     dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1530     dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1531     dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1532     dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1533     dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1534     dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1535     dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1536     dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1537     dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1538 }
1539
1540 static void mpeg_decode_extension(AVCodecContext *avctx,
1541                                   const uint8_t *buf, int buf_size)
1542 {
1543     Mpeg1Context *s1 = avctx->priv_data;
1544     MpegEncContext *s = &s1->mpeg_enc_ctx;
1545     int ext_type;
1546
1547     init_get_bits(&s->gb, buf, buf_size*8);
1548
1549     ext_type = get_bits(&s->gb, 4);
1550     switch(ext_type) {
1551     case 0x1:
1552         mpeg_decode_sequence_extension(s1);
1553         break;
1554     case 0x2:
1555         mpeg_decode_sequence_display_extension(s1);
1556         break;
1557     case 0x3:
1558         mpeg_decode_quant_matrix_extension(s);
1559         break;
1560     case 0x7:
1561         mpeg_decode_picture_display_extension(s1);
1562         break;
1563     case 0x8:
1564         mpeg_decode_picture_coding_extension(s);
1565         break;
1566     }
1567 }
1568
1569 static void exchange_uv(MpegEncContext *s){
1570     short * tmp = s->pblocks[4];
1571     s->pblocks[4] = s->pblocks[5];
1572     s->pblocks[5] = tmp;
1573 }
1574
1575 static int mpeg_field_start(MpegEncContext *s){
1576     AVCodecContext *avctx= s->avctx;
1577     Mpeg1Context *s1 = (Mpeg1Context*)s;
1578
1579     /* start frame decoding */
1580     if(s->first_field || s->picture_structure==PICT_FRAME){
1581         if(MPV_frame_start(s, avctx) < 0)
1582             return -1;
1583
1584         ff_er_frame_start(s);
1585
1586         /* first check if we must repeat the frame */
1587         s->current_picture_ptr->repeat_pict = 0;
1588         if (s->repeat_first_field) {
1589             if (s->progressive_sequence) {
1590                 if (s->top_field_first)
1591                     s->current_picture_ptr->repeat_pict = 4;
1592                 else
1593                     s->current_picture_ptr->repeat_pict = 2;
1594             } else if (s->progressive_frame) {
1595                 s->current_picture_ptr->repeat_pict = 1;
1596             }
1597         }
1598
1599         *s->current_picture_ptr->pan_scan= s1->pan_scan;
1600     }else{ //second field
1601             int i;
1602
1603             if(!s->current_picture_ptr){
1604                 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1605                 return -1;
1606             }
1607
1608             for(i=0; i<4; i++){
1609                 s->current_picture.data[i] = s->current_picture_ptr->data[i];
1610                 if(s->picture_structure == PICT_BOTTOM_FIELD){
1611                     s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1612                 }
1613             }
1614     }
1615 #ifdef HAVE_XVMC
1616 // MPV_frame_start will call this function too,
1617 // but we need to call it on every field
1618     if(s->avctx->xvmc_acceleration)
1619          XVMC_field_start(s,avctx);
1620 #endif
1621
1622     return 0;
1623 }
1624
1625 #define DECODE_SLICE_ERROR -1
1626 #define DECODE_SLICE_OK 0
1627
1628 /**
1629  * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1630  * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1631  *         DECODE_SLICE_OK if this slice is ok<br>
1632  */
1633 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1634                              const uint8_t **buf, int buf_size)
1635 {
1636     MpegEncContext *s = &s1->mpeg_enc_ctx;
1637     AVCodecContext *avctx= s->avctx;
1638     const int field_pic= s->picture_structure != PICT_FRAME;
1639     const int lowres= s->avctx->lowres;
1640
1641     s->resync_mb_x=
1642     s->resync_mb_y= -1;
1643
1644     if (mb_y<<field_pic >= s->mb_height){
1645         av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
1646         return -1;
1647     }
1648
1649     init_get_bits(&s->gb, *buf, buf_size*8);
1650
1651     ff_mpeg1_clean_buffers(s);
1652     s->interlaced_dct = 0;
1653
1654     s->qscale = get_qscale(s);
1655
1656     if(s->qscale == 0){
1657         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1658         return -1;
1659     }
1660
1661     /* extra slice info */
1662     while (get_bits1(&s->gb) != 0) {
1663         skip_bits(&s->gb, 8);
1664     }
1665
1666     s->mb_x=0;
1667
1668     for(;;) {
1669         int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1670         if (code < 0){
1671             av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1672             return -1;
1673         }
1674         if (code >= 33) {
1675             if (code == 33) {
1676                 s->mb_x += 33;
1677             }
1678             /* otherwise, stuffing, nothing to do */
1679         } else {
1680             s->mb_x += code;
1681             break;
1682         }
1683     }
1684     if(s->mb_x >= (unsigned)s->mb_width){
1685         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1686         return -1;
1687     }
1688
1689     s->resync_mb_x= s->mb_x;
1690     s->resync_mb_y= s->mb_y= mb_y;
1691     s->mb_skip_run= 0;
1692     ff_init_block_index(s);
1693
1694     if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1695         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1696              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",
1697                  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],
1698                  s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
1699                  s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1700                  s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1701                  s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1702         }
1703     }
1704
1705     for(;;) {
1706 #ifdef HAVE_XVMC
1707         //one 1 we memcpy blocks in xvmcvideo
1708         if(s->avctx->xvmc_acceleration > 1)
1709             XVMC_init_block(s);//set s->block
1710 #endif
1711
1712         if(mpeg_decode_mb(s, s->block) < 0)
1713             return -1;
1714
1715         if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1716             const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
1717             int xy = s->mb_x*2 + s->mb_y*2*wrap;
1718             int motion_x, motion_y, dir, i;
1719             if(field_pic && !s->first_field)
1720                 xy += wrap/2;
1721
1722             for(i=0; i<2; i++){
1723                 for(dir=0; dir<2; dir++){
1724                     if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
1725                         motion_x = motion_y = 0;
1726                     }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1727                         motion_x = s->mv[dir][0][0];
1728                         motion_y = s->mv[dir][0][1];
1729                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1730                         motion_x = s->mv[dir][i][0];
1731                         motion_y = s->mv[dir][i][1];
1732                     }
1733
1734                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1735                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1736                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1737                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1738                     s->current_picture.ref_index [dir][xy    ]=
1739                     s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
1740                     assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1741                 }
1742                 xy += wrap;
1743             }
1744         }
1745
1746         s->dest[0] += 16 >> lowres;
1747         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1748         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1749
1750         MPV_decode_mb(s, s->block);
1751
1752         if (++s->mb_x >= s->mb_width) {
1753             const int mb_size= 16>>s->avctx->lowres;
1754
1755             ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
1756
1757             s->mb_x = 0;
1758             s->mb_y++;
1759
1760             if(s->mb_y<<field_pic >= s->mb_height){
1761                 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
1762                 int is_d10= s->chroma_format==2 && s->pict_type==I_TYPE && avctx->profile==0 && avctx->level==5
1763                             && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1764                             && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1765
1766                 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1767                    || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
1768                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1769                     return -1;
1770                 }else
1771                     goto eos;
1772             }
1773
1774             ff_init_block_index(s);
1775         }
1776
1777         /* skip mb handling */
1778         if (s->mb_skip_run == -1) {
1779             /* read again increment */
1780             s->mb_skip_run = 0;
1781             for(;;) {
1782                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1783                 if (code < 0){
1784                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1785                     return -1;
1786                 }
1787                 if (code >= 33) {
1788                     if (code == 33) {
1789                         s->mb_skip_run += 33;
1790                     }else if(code == 35){
1791                         if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1792                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1793                             return -1;
1794                         }
1795                         goto eos; /* end of slice */
1796                     }
1797                     /* otherwise, stuffing, nothing to do */
1798                 } else {
1799                     s->mb_skip_run += code;
1800                     break;
1801                 }
1802             }
1803             if(s->mb_skip_run){
1804                 int i;
1805                 if(s->pict_type == I_TYPE){
1806                     av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1807                     return -1;
1808                 }
1809
1810                 /* skip mb */
1811                 s->mb_intra = 0;
1812                 for(i=0;i<12;i++)
1813                     s->block_last_index[i] = -1;
1814                 if(s->picture_structure == PICT_FRAME)
1815                     s->mv_type = MV_TYPE_16X16;
1816                 else
1817                     s->mv_type = MV_TYPE_FIELD;
1818                 if (s->pict_type == P_TYPE) {
1819                     /* if P type, zero motion vector is implied */
1820                     s->mv_dir = MV_DIR_FORWARD;
1821                     s->mv[0][0][0] = s->mv[0][0][1] = 0;
1822                     s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1823                     s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1824                     s->field_select[0][0]= s->picture_structure - 1;
1825                 } else {
1826                     /* if B type, reuse previous vectors and directions */
1827                     s->mv[0][0][0] = s->last_mv[0][0][0];
1828                     s->mv[0][0][1] = s->last_mv[0][0][1];
1829                     s->mv[1][0][0] = s->last_mv[1][0][0];
1830                     s->mv[1][0][1] = s->last_mv[1][0][1];
1831                 }
1832             }
1833         }
1834     }
1835 eos: // end of slice
1836     *buf += get_bits_count(&s->gb)/8 - 1;
1837 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1838     return 0;
1839 }
1840
1841 static int slice_decode_thread(AVCodecContext *c, void *arg){
1842     MpegEncContext *s= arg;
1843     const uint8_t *buf= s->gb.buffer;
1844     int mb_y= s->start_mb_y;
1845
1846     s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
1847
1848     for(;;){
1849         uint32_t start_code;
1850         int ret;
1851
1852         ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1853         emms_c();
1854 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1855 //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);
1856         if(ret < 0){
1857             if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1858                 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);
1859         }else{
1860             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);
1861         }
1862
1863         if(s->mb_y == s->end_mb_y)
1864             return 0;
1865
1866         start_code= -1;
1867         buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1868         mb_y= start_code - SLICE_MIN_START_CODE;
1869         if(mb_y < 0 || mb_y >= s->end_mb_y)
1870             return -1;
1871     }
1872
1873     return 0; //not reached
1874 }
1875
1876 /**
1877  * handles slice ends.
1878  * @return 1 if it seems to be the last slice of
1879  */
1880 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1881 {
1882     Mpeg1Context *s1 = avctx->priv_data;
1883     MpegEncContext *s = &s1->mpeg_enc_ctx;
1884
1885     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1886         return 0;
1887
1888 #ifdef HAVE_XVMC
1889     if(s->avctx->xvmc_acceleration)
1890         XVMC_field_end(s);
1891 #endif
1892     /* end of slice reached */
1893     if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1894         /* end of image */
1895
1896         s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1897
1898         ff_er_frame_end(s);
1899
1900         MPV_frame_end(s);
1901
1902         if (s->pict_type == B_TYPE || s->low_delay) {
1903             *pict= *(AVFrame*)s->current_picture_ptr;
1904             ff_print_debug_info(s, pict);
1905         } else {
1906             s->picture_number++;
1907             /* latency of 1 frame for I and P frames */
1908             /* XXX: use another variable than picture_number */
1909             if (s->last_picture_ptr != NULL) {
1910                 *pict= *(AVFrame*)s->last_picture_ptr;
1911                  ff_print_debug_info(s, pict);
1912             }
1913         }
1914
1915         return 1;
1916     } else {
1917         return 0;
1918     }
1919 }
1920
1921 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1922                                  const uint8_t *buf, int buf_size)
1923 {
1924     Mpeg1Context *s1 = avctx->priv_data;
1925     MpegEncContext *s = &s1->mpeg_enc_ctx;
1926     int width,height;
1927     int i, v, j;
1928
1929     init_get_bits(&s->gb, buf, buf_size*8);
1930
1931     width = get_bits(&s->gb, 12);
1932     height = get_bits(&s->gb, 12);
1933     if (width <= 0 || height <= 0 ||
1934         (width % 2) != 0 || (height % 2) != 0)
1935         return -1;
1936     s->aspect_ratio_info= get_bits(&s->gb, 4);
1937     if (s->aspect_ratio_info == 0)
1938         return -1;
1939     s->frame_rate_index = get_bits(&s->gb, 4);
1940     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1941         return -1;
1942     s->bit_rate = get_bits(&s->gb, 18) * 400;
1943     if (get_bits1(&s->gb) == 0) /* marker */
1944         return -1;
1945     s->width = width;
1946     s->height = height;
1947
1948     s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
1949     skip_bits(&s->gb, 1);
1950
1951     /* get matrix */
1952     if (get_bits1(&s->gb)) {
1953         for(i=0;i<64;i++) {
1954             v = get_bits(&s->gb, 8);
1955             if(v==0){
1956                 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
1957                 return -1;
1958             }
1959             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1960             s->intra_matrix[j] = v;
1961             s->chroma_intra_matrix[j] = v;
1962         }
1963 #ifdef DEBUG
1964         dprintf(s->avctx, "intra matrix present\n");
1965         for(i=0;i<64;i++)
1966             dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
1967         dprintf(s->avctx, "\n");
1968 #endif
1969     } else {
1970         for(i=0;i<64;i++) {
1971             j = s->dsp.idct_permutation[i];
1972             v = ff_mpeg1_default_intra_matrix[i];
1973             s->intra_matrix[j] = v;
1974             s->chroma_intra_matrix[j] = v;
1975         }
1976     }
1977     if (get_bits1(&s->gb)) {
1978         for(i=0;i<64;i++) {
1979             v = get_bits(&s->gb, 8);
1980             if(v==0){
1981                 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
1982                 return -1;
1983             }
1984             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1985             s->inter_matrix[j] = v;
1986             s->chroma_inter_matrix[j] = v;
1987         }
1988 #ifdef DEBUG
1989         dprintf(s->avctx, "non intra matrix present\n");
1990         for(i=0;i<64;i++)
1991             dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
1992         dprintf(s->avctx, "\n");
1993 #endif
1994     } else {
1995         for(i=0;i<64;i++) {
1996             int j= s->dsp.idct_permutation[i];
1997             v = ff_mpeg1_default_non_intra_matrix[i];
1998             s->inter_matrix[j] = v;
1999             s->chroma_inter_matrix[j] = v;
2000         }
2001     }
2002
2003     if(show_bits(&s->gb, 23) != 0){
2004         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2005         return -1;
2006     }
2007
2008     /* we set mpeg2 parameters so that it emulates mpeg1 */
2009     s->progressive_sequence = 1;
2010     s->progressive_frame = 1;
2011     s->picture_structure = PICT_FRAME;
2012     s->frame_pred_frame_dct = 1;
2013     s->chroma_format = 1;
2014     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2015     avctx->sub_id = 1; /* indicates mpeg1 */
2016     s->out_format = FMT_MPEG1;
2017     s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2018     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2019
2020     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2021         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2022                s->avctx->rc_buffer_size, s->bit_rate);
2023
2024     return 0;
2025 }
2026
2027 static int vcr2_init_sequence(AVCodecContext *avctx)
2028 {
2029     Mpeg1Context *s1 = avctx->priv_data;
2030     MpegEncContext *s = &s1->mpeg_enc_ctx;
2031     int i, v;
2032
2033     /* start new mpeg1 context decoding */
2034     s->out_format = FMT_MPEG1;
2035     if (s1->mpeg_enc_ctx_allocated) {
2036         MPV_common_end(s);
2037     }
2038     s->width  = avctx->coded_width;
2039     s->height = avctx->coded_height;
2040     avctx->has_b_frames= 0; //true?
2041     s->low_delay= 1;
2042
2043     if(avctx->xvmc_acceleration){
2044         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2045     }else{
2046         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2047     }
2048
2049     if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2050         if( avctx->idct_algo == FF_IDCT_AUTO )
2051             avctx->idct_algo = FF_IDCT_SIMPLE;
2052
2053     if (MPV_common_init(s) < 0)
2054         return -1;
2055     exchange_uv(s);//common init reset pblocks, so we swap them here
2056     s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2057     s1->mpeg_enc_ctx_allocated = 1;
2058
2059     for(i=0;i<64;i++) {
2060         int j= s->dsp.idct_permutation[i];
2061         v = ff_mpeg1_default_intra_matrix[i];
2062         s->intra_matrix[j] = v;
2063         s->chroma_intra_matrix[j] = v;
2064
2065         v = ff_mpeg1_default_non_intra_matrix[i];
2066         s->inter_matrix[j] = v;
2067         s->chroma_inter_matrix[j] = v;
2068     }
2069
2070     s->progressive_sequence = 1;
2071     s->progressive_frame = 1;
2072     s->picture_structure = PICT_FRAME;
2073     s->frame_pred_frame_dct = 1;
2074     s->chroma_format = 1;
2075     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2076     avctx->sub_id = 2; /* indicates mpeg2 */
2077     return 0;
2078 }
2079
2080
2081 static void mpeg_decode_user_data(AVCodecContext *avctx,
2082                                   const uint8_t *buf, int buf_size)
2083 {
2084     const uint8_t *p;
2085     int len, flags;
2086     p = buf;
2087     len = buf_size;
2088
2089     /* we parse the DTG active format information */
2090     if (len >= 5 &&
2091         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2092         flags = p[4];
2093         p += 5;
2094         len -= 5;
2095         if (flags & 0x80) {
2096             /* skip event id */
2097             if (len < 2)
2098                 return;
2099             p += 2;
2100             len -= 2;
2101         }
2102         if (flags & 0x40) {
2103             if (len < 1)
2104                 return;
2105             avctx->dtg_active_format = p[0] & 0x0f;
2106         }
2107     }
2108 }
2109
2110 static void mpeg_decode_gop(AVCodecContext *avctx,
2111                             const uint8_t *buf, int buf_size){
2112     Mpeg1Context *s1 = avctx->priv_data;
2113     MpegEncContext *s = &s1->mpeg_enc_ctx;
2114
2115     int drop_frame_flag;
2116     int time_code_hours, time_code_minutes;
2117     int time_code_seconds, time_code_pictures;
2118     int broken_link;
2119
2120     init_get_bits(&s->gb, buf, buf_size*8);
2121
2122     drop_frame_flag = get_bits1(&s->gb);
2123
2124     time_code_hours=get_bits(&s->gb,5);
2125     time_code_minutes = get_bits(&s->gb,6);
2126     skip_bits1(&s->gb);//marker bit
2127     time_code_seconds = get_bits(&s->gb,6);
2128     time_code_pictures = get_bits(&s->gb,6);
2129
2130     /*broken_link indicate that after editing the
2131       reference frames of the first B-Frames after GOP I-Frame
2132       are missing (open gop)*/
2133     broken_link = get_bits1(&s->gb);
2134
2135     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2136         av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
2137             time_code_hours, time_code_minutes, time_code_seconds,
2138             time_code_pictures, broken_link);
2139 }
2140 /**
2141  * finds the end of the current frame in the bitstream.
2142  * @return the position of the first byte of the next frame, or -1
2143  */
2144 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2145 {
2146     int i;
2147     uint32_t state= pc->state;
2148
2149     i=0;
2150     if(!pc->frame_start_found){
2151         for(i=0; i<buf_size; i++){
2152             i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2153             if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2154                 i++;
2155                 pc->frame_start_found=1;
2156                 break;
2157             }
2158         }
2159     }
2160
2161     if(pc->frame_start_found){
2162         /* EOF considered as end of frame */
2163         if (buf_size == 0)
2164             return 0;
2165         for(; i<buf_size; i++){
2166             i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2167             if((state&0xFFFFFF00) == 0x100){
2168                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2169                     pc->frame_start_found=0;
2170                     pc->state=-1;
2171                     return i-3;
2172                 }
2173             }
2174         }
2175     }
2176     pc->state= state;
2177     return END_NOT_FOUND;
2178 }
2179
2180 /* handle buffering and image synchronisation */
2181 static int mpeg_decode_frame(AVCodecContext *avctx,
2182                              void *data, int *data_size,
2183                              uint8_t *buf, int buf_size)
2184 {
2185     Mpeg1Context *s = avctx->priv_data;
2186     const uint8_t *buf_end;
2187     const uint8_t *buf_ptr;
2188     uint32_t start_code;
2189     int ret, input_size;
2190     AVFrame *picture = data;
2191     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2192     dprintf(avctx, "fill_buffer\n");
2193
2194     if (buf_size == 0) {
2195         /* special case for last picture */
2196         if (s2->low_delay==0 && s2->next_picture_ptr) {
2197             *picture= *(AVFrame*)s2->next_picture_ptr;
2198             s2->next_picture_ptr= NULL;
2199
2200             *data_size = sizeof(AVFrame);
2201         }
2202         return 0;
2203     }
2204
2205     if(s2->flags&CODEC_FLAG_TRUNCATED){
2206         int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
2207
2208         if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2209             return buf_size;
2210     }
2211
2212     buf_ptr = buf;
2213     buf_end = buf + buf_size;
2214
2215 #if 0
2216     if (s->repeat_field % 2 == 1) {
2217         s->repeat_field++;
2218         //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2219         //        s2->picture_number, s->repeat_field);
2220         if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2221             *data_size = sizeof(AVPicture);
2222             goto the_end;
2223         }
2224     }
2225 #endif
2226
2227     if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2228         vcr2_init_sequence(avctx);
2229
2230     s->slice_count= 0;
2231
2232     for(;;) {
2233         /* find start next code */
2234         start_code = -1;
2235         buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2236         if (start_code > 0x1ff){
2237             if(s2->pict_type != B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2238                 if(avctx->thread_count > 1){
2239                     int i;
2240
2241                     avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
2242                     for(i=0; i<s->slice_count; i++)
2243                         s2->error_count += s2->thread_context[i]->error_count;
2244                 }
2245                 if (slice_end(avctx, picture)) {
2246                     if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2247                         *data_size = sizeof(AVPicture);
2248                 }
2249             }
2250             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2251         }
2252
2253         input_size = buf_end - buf_ptr;
2254
2255         if(avctx->debug & FF_DEBUG_STARTCODE){
2256             av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
2257         }
2258
2259         /* prepare data for next start code */
2260         switch(start_code) {
2261         case SEQ_START_CODE:
2262             mpeg1_decode_sequence(avctx, buf_ptr,
2263                                     input_size);
2264             break;
2265
2266         case PICTURE_START_CODE:
2267             /* we have a complete image : we try to decompress it */
2268             mpeg1_decode_picture(avctx,
2269                                     buf_ptr, input_size);
2270             break;
2271         case EXT_START_CODE:
2272             mpeg_decode_extension(avctx,
2273                                     buf_ptr, input_size);
2274             break;
2275         case USER_START_CODE:
2276             mpeg_decode_user_data(avctx,
2277                                     buf_ptr, input_size);
2278             break;
2279         case GOP_START_CODE:
2280             s2->first_field=0;
2281             mpeg_decode_gop(avctx,
2282                                     buf_ptr, input_size);
2283             break;
2284         default:
2285             if (start_code >= SLICE_MIN_START_CODE &&
2286                 start_code <= SLICE_MAX_START_CODE) {
2287                 int mb_y= start_code - SLICE_MIN_START_CODE;
2288
2289                 if(s2->last_picture_ptr==NULL){
2290                 /* Skip B-frames if we do not have reference frames. */
2291                     if(s2->pict_type==B_TYPE) break;
2292                 /* Skip P-frames if we do not have reference frame no valid header. */
2293 //                    if(s2->pict_type==P_TYPE && s2->first_field && !s2->first_slice) break;
2294                 }
2295                 /* Skip B-frames if we are in a hurry. */
2296                 if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2297                 if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==B_TYPE)
2298                     ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=I_TYPE)
2299                     || avctx->skip_frame >= AVDISCARD_ALL)
2300                     break;
2301                 /* Skip everything if we are in a hurry>=5. */
2302                 if(avctx->hurry_up>=5) break;
2303
2304                 if (!s->mpeg_enc_ctx_allocated) break;
2305
2306                 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2307                     if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2308                         break;
2309                 }
2310
2311                 if(s2->first_slice){
2312                     s2->first_slice=0;
2313                             if(mpeg_field_start(s2) < 0)
2314                         return -1;
2315                     }
2316                 if(!s2->current_picture_ptr){
2317                     av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2318                     return -1;
2319                 }
2320
2321                 if(avctx->thread_count > 1){
2322                     int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2323                     if(threshold <= mb_y){
2324                         MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2325
2326                         thread_context->start_mb_y= mb_y;
2327                         thread_context->end_mb_y  = s2->mb_height;
2328                         if(s->slice_count){
2329                             s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2330                             ff_update_duplicate_context(thread_context, s2);
2331                         }
2332                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2333                         s->slice_count++;
2334                     }
2335                     buf_ptr += 2; //FIXME add minimum num of bytes per slice
2336                 }else{
2337                     ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2338                     emms_c();
2339
2340                     if(ret < 0){
2341                         if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2342                             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);
2343                     }else{
2344                         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);
2345                     }
2346                 }
2347             }
2348             break;
2349         }
2350     }
2351 }
2352
2353 static int mpeg_decode_end(AVCodecContext *avctx)
2354 {
2355     Mpeg1Context *s = avctx->priv_data;
2356
2357     if (s->mpeg_enc_ctx_allocated)
2358         MPV_common_end(&s->mpeg_enc_ctx);
2359     return 0;
2360 }
2361
2362 AVCodec mpeg1video_decoder = {
2363     "mpeg1video",
2364     CODEC_TYPE_VIDEO,
2365     CODEC_ID_MPEG1VIDEO,
2366     sizeof(Mpeg1Context),
2367     mpeg_decode_init,
2368     NULL,
2369     mpeg_decode_end,
2370     mpeg_decode_frame,
2371     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2372     .flush= ff_mpeg_flush,
2373 };
2374
2375 AVCodec mpeg2video_decoder = {
2376     "mpeg2video",
2377     CODEC_TYPE_VIDEO,
2378     CODEC_ID_MPEG2VIDEO,
2379     sizeof(Mpeg1Context),
2380     mpeg_decode_init,
2381     NULL,
2382     mpeg_decode_end,
2383     mpeg_decode_frame,
2384     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2385     .flush= ff_mpeg_flush,
2386 };
2387
2388 //legacy decoder
2389 AVCodec mpegvideo_decoder = {
2390     "mpegvideo",
2391     CODEC_TYPE_VIDEO,
2392     CODEC_ID_MPEG2VIDEO,
2393     sizeof(Mpeg1Context),
2394     mpeg_decode_init,
2395     NULL,
2396     mpeg_decode_end,
2397     mpeg_decode_frame,
2398     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2399     .flush= ff_mpeg_flush,
2400 };
2401
2402 #ifdef HAVE_XVMC
2403 static int mpeg_mc_decode_init(AVCodecContext *avctx){
2404     Mpeg1Context *s;
2405
2406     if( avctx->thread_count > 1)
2407         return -1;
2408     if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2409         return -1;
2410     if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2411         dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2412     }
2413     mpeg_decode_init(avctx);
2414     s = avctx->priv_data;
2415
2416     avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2417     avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2418
2419     return 0;
2420 }
2421
2422 AVCodec mpeg_xvmc_decoder = {
2423     "mpegvideo_xvmc",
2424     CODEC_TYPE_VIDEO,
2425     CODEC_ID_MPEG2VIDEO_XVMC,
2426     sizeof(Mpeg1Context),
2427     mpeg_mc_decode_init,
2428     NULL,
2429     mpeg_decode_end,
2430     mpeg_decode_frame,
2431     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2432     .flush= ff_mpeg_flush,
2433 };
2434
2435 #endif
2436
2437 /* this is ugly i know, but the alternative is too make
2438    hundreds of vars global and prefix them with ff_mpeg1_
2439    which is far uglier. */
2440 #include "mdec.c"