Introduce slice threads flag.
[ffmpeg.git] / libavcodec / mpeg12.c
1 /*
2  * MPEG-1/2 decoder
3  * Copyright (c) 2000,2001 Fabrice Bellard
4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of Libav.
7  *
8  * Libav is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * Libav is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22
23 /**
24  * @file
25  * MPEG-1/2 decoder
26  */
27
28 //#define DEBUG
29 #include "internal.h"
30 #include "avcodec.h"
31 #include "dsputil.h"
32 #include "mpegvideo.h"
33
34 #include "mpeg12.h"
35 #include "mpeg12data.h"
36 #include "mpeg12decdata.h"
37 #include "bytestream.h"
38 #include "vdpau_internal.h"
39 #include "xvmc_internal.h"
40
41 //#undef NDEBUG
42 //#include <assert.h>
43
44
45 #define MV_VLC_BITS 9
46 #define MBINCR_VLC_BITS 9
47 #define MB_PAT_VLC_BITS 9
48 #define MB_PTYPE_VLC_BITS 6
49 #define MB_BTYPE_VLC_BITS 6
50
51 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
52                               DCTELEM *block,
53                               int n);
54 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
55                               DCTELEM *block,
56                               int n);
57 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
58 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
59                                         DCTELEM *block,
60                                         int n);
61 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
62                                     DCTELEM *block,
63                                     int n);
64 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
65 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
66 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
67 static void exchange_uv(MpegEncContext *s);
68
69 static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
70                                            PIX_FMT_XVMC_MPEG2_IDCT,
71                                            PIX_FMT_XVMC_MPEG2_MC,
72                                            PIX_FMT_NONE};
73
74 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
75
76
77 #define INIT_2D_VLC_RL(rl, static_size)\
78 {\
79     static RL_VLC_ELEM rl_vlc_table[static_size];\
80     INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
81              &rl.table_vlc[0][1], 4, 2,\
82              &rl.table_vlc[0][0], 4, 2, static_size);\
83 \
84     rl.rl_vlc[0]= rl_vlc_table;\
85     init_2d_vlc_rl(&rl);\
86 }
87
88 static void init_2d_vlc_rl(RLTable *rl)
89 {
90     int i;
91
92     for(i=0; i<rl->vlc.table_size; i++){
93         int code= rl->vlc.table[i][0];
94         int len = rl->vlc.table[i][1];
95         int level, run;
96
97         if(len==0){ // illegal code
98             run= 65;
99             level= MAX_LEVEL;
100         }else if(len<0){ //more bits needed
101             run= 0;
102             level= code;
103         }else{
104             if(code==rl->n){ //esc
105                 run= 65;
106                 level= 0;
107             }else if(code==rl->n+1){ //eob
108                 run= 0;
109                 level= 127;
110             }else{
111                 run=   rl->table_run  [code] + 1;
112                 level= rl->table_level[code];
113             }
114         }
115         rl->rl_vlc[0][i].len= len;
116         rl->rl_vlc[0][i].level= level;
117         rl->rl_vlc[0][i].run= run;
118     }
119 }
120
121 void ff_mpeg12_common_init(MpegEncContext *s)
122 {
123
124     s->y_dc_scale_table=
125     s->c_dc_scale_table= ff_mpeg2_dc_scale_table[s->intra_dc_precision];
126
127 }
128
129 void ff_mpeg1_clean_buffers(MpegEncContext *s){
130     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
131     s->last_dc[1] = s->last_dc[0];
132     s->last_dc[2] = s->last_dc[0];
133     memset(s->last_mv, 0, sizeof(s->last_mv));
134 }
135
136
137 /******************************************/
138 /* decoding */
139
140 VLC ff_dc_lum_vlc;
141 VLC ff_dc_chroma_vlc;
142
143 static VLC mv_vlc;
144 static VLC mbincr_vlc;
145 static VLC mb_ptype_vlc;
146 static VLC mb_btype_vlc;
147 static VLC mb_pat_vlc;
148
149 av_cold void ff_mpeg12_init_vlcs(void)
150 {
151     static int done = 0;
152
153     if (!done) {
154         done = 1;
155
156         INIT_VLC_STATIC(&ff_dc_lum_vlc, DC_VLC_BITS, 12,
157                  ff_mpeg12_vlc_dc_lum_bits, 1, 1,
158                  ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
159         INIT_VLC_STATIC(&ff_dc_chroma_vlc,  DC_VLC_BITS, 12,
160                  ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
161                  ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
162         INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
163                  &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
164                  &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
165         INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
166                  &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
167                  &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
168         INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
169                  &ff_mpeg12_mbPatTable[0][1], 2, 1,
170                  &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
171
172         INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
173                  &table_mb_ptype[0][1], 2, 1,
174                  &table_mb_ptype[0][0], 2, 1, 64);
175         INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
176                  &table_mb_btype[0][1], 2, 1,
177                  &table_mb_btype[0][0], 2, 1, 64);
178         init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
179         init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
180
181         INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
182         INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
183     }
184 }
185
186 static inline int get_dmv(MpegEncContext *s)
187 {
188     if(get_bits1(&s->gb))
189         return 1 - (get_bits1(&s->gb) << 1);
190     else
191         return 0;
192 }
193
194 static inline int get_qscale(MpegEncContext *s)
195 {
196     int qscale = get_bits(&s->gb, 5);
197     if (s->q_scale_type) {
198         return non_linear_qscale[qscale];
199     } else {
200         return qscale << 1;
201     }
202 }
203
204 /* motion type (for MPEG-2) */
205 #define MT_FIELD 1
206 #define MT_FRAME 2
207 #define MT_16X8  2
208 #define MT_DMV   3
209
210 static int mpeg_decode_mb(MpegEncContext *s,
211                           DCTELEM block[12][64])
212 {
213     int i, j, k, cbp, val, mb_type, motion_type;
214     const int mb_block_count = 4 + (1<< s->chroma_format);
215
216     av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
217
218     assert(s->mb_skipped==0);
219
220     if (s->mb_skip_run-- != 0) {
221         if (s->pict_type == FF_P_TYPE) {
222             s->mb_skipped = 1;
223             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
224         } else {
225             int mb_type;
226
227             if(s->mb_x)
228                 mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
229             else
230                 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
231             if(IS_INTRA(mb_type))
232                 return -1;
233
234             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
235                 mb_type | MB_TYPE_SKIP;
236 //            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
237
238             if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
239                 s->mb_skipped = 1;
240         }
241
242         return 0;
243     }
244
245     switch(s->pict_type) {
246     default:
247     case FF_I_TYPE:
248         if (get_bits1(&s->gb) == 0) {
249             if (get_bits1(&s->gb) == 0){
250                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
251                 return -1;
252             }
253             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
254         } else {
255             mb_type = MB_TYPE_INTRA;
256         }
257         break;
258     case FF_P_TYPE:
259         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
260         if (mb_type < 0){
261             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
262             return -1;
263         }
264         mb_type = ptype2mb_type[ mb_type ];
265         break;
266     case FF_B_TYPE:
267         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
268         if (mb_type < 0){
269             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
270             return -1;
271         }
272         mb_type = btype2mb_type[ mb_type ];
273         break;
274     }
275     av_dlog(s->avctx, "mb_type=%x\n", mb_type);
276 //    motion_type = 0; /* avoid warning */
277     if (IS_INTRA(mb_type)) {
278         s->dsp.clear_blocks(s->block[0]);
279
280         if(!s->chroma_y_shift){
281             s->dsp.clear_blocks(s->block[6]);
282         }
283
284         /* compute DCT type */
285         if (s->picture_structure == PICT_FRAME && //FIXME add an interlaced_dct coded var?
286             !s->frame_pred_frame_dct) {
287             s->interlaced_dct = get_bits1(&s->gb);
288         }
289
290         if (IS_QUANT(mb_type))
291             s->qscale = get_qscale(s);
292
293         if (s->concealment_motion_vectors) {
294             /* just parse them */
295             if (s->picture_structure != PICT_FRAME)
296                 skip_bits1(&s->gb); /* field select */
297
298             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
299                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
300             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
301                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
302
303             skip_bits1(&s->gb); /* marker */
304         }else
305             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
306         s->mb_intra = 1;
307         //if 1, we memcpy blocks in xvmcvideo
308         if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
309             ff_xvmc_pack_pblocks(s,-1);//inter are always full blocks
310             if(s->swap_uv){
311                 exchange_uv(s);
312             }
313         }
314
315         if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
316             if(s->flags2 & CODEC_FLAG2_FAST){
317                 for(i=0;i<6;i++) {
318                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
319                 }
320             }else{
321                 for(i=0;i<mb_block_count;i++) {
322                     if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
323                         return -1;
324                 }
325             }
326         } else {
327             for(i=0;i<6;i++) {
328                 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
329                     return -1;
330             }
331         }
332     } else {
333         if (mb_type & MB_TYPE_ZERO_MV){
334             assert(mb_type & MB_TYPE_CBP);
335
336             s->mv_dir = MV_DIR_FORWARD;
337             if(s->picture_structure == PICT_FRAME){
338                 if(!s->frame_pred_frame_dct)
339                     s->interlaced_dct = get_bits1(&s->gb);
340                 s->mv_type = MV_TYPE_16X16;
341             }else{
342                 s->mv_type = MV_TYPE_FIELD;
343                 mb_type |= MB_TYPE_INTERLACED;
344                 s->field_select[0][0]= s->picture_structure - 1;
345             }
346
347             if (IS_QUANT(mb_type))
348                 s->qscale = get_qscale(s);
349
350             s->last_mv[0][0][0] = 0;
351             s->last_mv[0][0][1] = 0;
352             s->last_mv[0][1][0] = 0;
353             s->last_mv[0][1][1] = 0;
354             s->mv[0][0][0] = 0;
355             s->mv[0][0][1] = 0;
356         }else{
357             assert(mb_type & MB_TYPE_L0L1);
358 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
359             /* get additional motion vector type */
360             if (s->frame_pred_frame_dct)
361                 motion_type = MT_FRAME;
362             else{
363                 motion_type = get_bits(&s->gb, 2);
364                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
365                     s->interlaced_dct = get_bits1(&s->gb);
366             }
367
368             if (IS_QUANT(mb_type))
369                 s->qscale = get_qscale(s);
370
371             /* motion vectors */
372             s->mv_dir= (mb_type>>13)&3;
373             av_dlog(s->avctx, "motion_type=%d\n", motion_type);
374             switch(motion_type) {
375             case MT_FRAME: /* or MT_16X8 */
376                 if (s->picture_structure == PICT_FRAME) {
377                     mb_type |= MB_TYPE_16x16;
378                     s->mv_type = MV_TYPE_16X16;
379                     for(i=0;i<2;i++) {
380                         if (USES_LIST(mb_type, i)) {
381                             /* MT_FRAME */
382                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
383                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
384                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
385                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
386                             /* full_pel: only for MPEG-1 */
387                             if (s->full_pel[i]){
388                                 s->mv[i][0][0] <<= 1;
389                                 s->mv[i][0][1] <<= 1;
390                             }
391                         }
392                     }
393                 } else {
394                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
395                     s->mv_type = MV_TYPE_16X8;
396                     for(i=0;i<2;i++) {
397                         if (USES_LIST(mb_type, i)) {
398                             /* MT_16X8 */
399                             for(j=0;j<2;j++) {
400                                 s->field_select[i][j] = get_bits1(&s->gb);
401                                 for(k=0;k<2;k++) {
402                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
403                                                              s->last_mv[i][j][k]);
404                                     s->last_mv[i][j][k] = val;
405                                     s->mv[i][j][k] = val;
406                                 }
407                             }
408                         }
409                     }
410                 }
411                 break;
412             case MT_FIELD:
413                 s->mv_type = MV_TYPE_FIELD;
414                 if (s->picture_structure == PICT_FRAME) {
415                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
416                     for(i=0;i<2;i++) {
417                         if (USES_LIST(mb_type, i)) {
418                             for(j=0;j<2;j++) {
419                                 s->field_select[i][j] = get_bits1(&s->gb);
420                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
421                                                          s->last_mv[i][j][0]);
422                                 s->last_mv[i][j][0] = val;
423                                 s->mv[i][j][0] = val;
424                                 av_dlog(s->avctx, "fmx=%d\n", val);
425                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
426                                                          s->last_mv[i][j][1] >> 1);
427                                 s->last_mv[i][j][1] = val << 1;
428                                 s->mv[i][j][1] = val;
429                                 av_dlog(s->avctx, "fmy=%d\n", val);
430                             }
431                         }
432                     }
433                 } else {
434                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
435                     for(i=0;i<2;i++) {
436                         if (USES_LIST(mb_type, i)) {
437                             s->field_select[i][0] = get_bits1(&s->gb);
438                             for(k=0;k<2;k++) {
439                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
440                                                          s->last_mv[i][0][k]);
441                                 s->last_mv[i][0][k] = val;
442                                 s->last_mv[i][1][k] = val;
443                                 s->mv[i][0][k] = val;
444                             }
445                         }
446                     }
447                 }
448                 break;
449             case MT_DMV:
450                 s->mv_type = MV_TYPE_DMV;
451                 for(i=0;i<2;i++) {
452                     if (USES_LIST(mb_type, i)) {
453                         int dmx, dmy, mx, my, m;
454                         const int my_shift= s->picture_structure == PICT_FRAME;
455
456                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
457                                                 s->last_mv[i][0][0]);
458                         s->last_mv[i][0][0] = mx;
459                         s->last_mv[i][1][0] = mx;
460                         dmx = get_dmv(s);
461                         my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
462                                                 s->last_mv[i][0][1] >> my_shift);
463                         dmy = get_dmv(s);
464
465
466                         s->last_mv[i][0][1] = my<<my_shift;
467                         s->last_mv[i][1][1] = my<<my_shift;
468
469                         s->mv[i][0][0] = mx;
470                         s->mv[i][0][1] = my;
471                         s->mv[i][1][0] = mx;//not used
472                         s->mv[i][1][1] = my;//not used
473
474                         if (s->picture_structure == PICT_FRAME) {
475                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
476
477                             //m = 1 + 2 * s->top_field_first;
478                             m = s->top_field_first ? 1 : 3;
479
480                             /* top -> top pred */
481                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
482                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
483                             m = 4 - m;
484                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
485                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
486                         } else {
487                             mb_type |= MB_TYPE_16x16;
488
489                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
490                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
491                             if(s->picture_structure == PICT_TOP_FIELD)
492                                 s->mv[i][2][1]--;
493                             else
494                                 s->mv[i][2][1]++;
495                         }
496                     }
497                 }
498                 break;
499             default:
500                 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
501                 return -1;
502             }
503         }
504
505         s->mb_intra = 0;
506         if (HAS_CBP(mb_type)) {
507             s->dsp.clear_blocks(s->block[0]);
508
509             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
510             if(mb_block_count > 6){
511                  cbp<<= mb_block_count-6;
512                  cbp |= get_bits(&s->gb, mb_block_count-6);
513                  s->dsp.clear_blocks(s->block[6]);
514             }
515             if (cbp <= 0){
516                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
517                 return -1;
518             }
519
520             //if 1, we memcpy blocks in xvmcvideo
521             if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
522                 ff_xvmc_pack_pblocks(s,cbp);
523                 if(s->swap_uv){
524                     exchange_uv(s);
525                 }
526             }
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 H.263, 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 mpeg1_decode_block_intra(MpegEncContext *s,
616                                DCTELEM *block,
617                                int n)
618 {
619     int level, dc, diff, i, j, run;
620     int component;
621     RLTable *rl = &ff_rl_mpeg1;
622     uint8_t * const scantable= s->intra_scantable.permutated;
623     const uint16_t *quant_matrix= s->intra_matrix;
624     const int qscale= s->qscale;
625
626     /* DC coefficient */
627     component = (n <= 3 ? 0 : n - 4 + 1);
628     diff = decode_dc(&s->gb, component);
629     if (diff >= 0xffff)
630         return -1;
631     dc = s->last_dc[component];
632     dc += diff;
633     s->last_dc[component] = dc;
634     block[0] = dc*quant_matrix[0];
635     av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
636     i = 0;
637     {
638         OPEN_READER(re, &s->gb);
639         /* now quantify & encode AC coefficients */
640         for(;;) {
641             UPDATE_CACHE(re, &s->gb);
642             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
643
644             if(level == 127){
645                 break;
646             } else if(level != 0) {
647                 i += run;
648                 j = scantable[i];
649                 level= (level*qscale*quant_matrix[j])>>4;
650                 level= (level-1)|1;
651                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
652                 LAST_SKIP_BITS(re, &s->gb, 1);
653             } else {
654                 /* escape */
655                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
656                 UPDATE_CACHE(re, &s->gb);
657                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
658                 if (level == -128) {
659                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
660                 } else if (level == 0) {
661                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
662                 }
663                 i += run;
664                 j = scantable[i];
665                 if(level<0){
666                     level= -level;
667                     level= (level*qscale*quant_matrix[j])>>4;
668                     level= (level-1)|1;
669                     level= -level;
670                 }else{
671                     level= (level*qscale*quant_matrix[j])>>4;
672                     level= (level-1)|1;
673                 }
674             }
675             if (i > 63){
676                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
677                 return -1;
678             }
679
680             block[j] = level;
681         }
682         CLOSE_READER(re, &s->gb);
683     }
684     s->block_last_index[n] = i;
685    return 0;
686 }
687
688 int ff_mpeg1_decode_block_intra(MpegEncContext *s,
689                                 DCTELEM *block,
690                                 int n)
691 {
692     return mpeg1_decode_block_intra(s, block, n);
693 }
694
695 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
696                                DCTELEM *block,
697                                int n)
698 {
699     int level, i, j, run;
700     RLTable *rl = &ff_rl_mpeg1;
701     uint8_t * const scantable= s->intra_scantable.permutated;
702     const uint16_t *quant_matrix= s->inter_matrix;
703     const int qscale= s->qscale;
704
705     {
706         OPEN_READER(re, &s->gb);
707         i = -1;
708         // special case for first coefficient, no need to add second VLC table
709         UPDATE_CACHE(re, &s->gb);
710         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
711             level= (3*qscale*quant_matrix[0])>>5;
712             level= (level-1)|1;
713             if(GET_CACHE(re, &s->gb)&0x40000000)
714                 level= -level;
715             block[0] = level;
716             i++;
717             SKIP_BITS(re, &s->gb, 2);
718             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
719                 goto end;
720         }
721         /* now quantify & encode AC coefficients */
722         for(;;) {
723             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
724
725             if(level != 0) {
726                 i += run;
727                 j = scantable[i];
728                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
729                 level= (level-1)|1;
730                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
731                 SKIP_BITS(re, &s->gb, 1);
732             } else {
733                 /* escape */
734                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
735                 UPDATE_CACHE(re, &s->gb);
736                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
737                 if (level == -128) {
738                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
739                 } else if (level == 0) {
740                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
741                 }
742                 i += run;
743                 j = scantable[i];
744                 if(level<0){
745                     level= -level;
746                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
747                     level= (level-1)|1;
748                     level= -level;
749                 }else{
750                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
751                     level= (level-1)|1;
752                 }
753             }
754             if (i > 63){
755                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
756                 return -1;
757             }
758
759             block[j] = level;
760             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
761                 break;
762             UPDATE_CACHE(re, &s->gb);
763         }
764 end:
765         LAST_SKIP_BITS(re, &s->gb, 2);
766         CLOSE_READER(re, &s->gb);
767     }
768     s->block_last_index[n] = i;
769     return 0;
770 }
771
772 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
773 {
774     int level, i, j, run;
775     RLTable *rl = &ff_rl_mpeg1;
776     uint8_t * const scantable= s->intra_scantable.permutated;
777     const int qscale= s->qscale;
778
779     {
780         OPEN_READER(re, &s->gb);
781         i = -1;
782         // special case for first coefficient, no need to add second VLC table
783         UPDATE_CACHE(re, &s->gb);
784         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
785             level= (3*qscale)>>1;
786             level= (level-1)|1;
787             if(GET_CACHE(re, &s->gb)&0x40000000)
788                 level= -level;
789             block[0] = level;
790             i++;
791             SKIP_BITS(re, &s->gb, 2);
792             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
793                 goto end;
794         }
795
796         /* now quantify & encode AC coefficients */
797         for(;;) {
798             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
799
800             if(level != 0) {
801                 i += run;
802                 j = scantable[i];
803                 level= ((level*2+1)*qscale)>>1;
804                 level= (level-1)|1;
805                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
806                 SKIP_BITS(re, &s->gb, 1);
807             } else {
808                 /* escape */
809                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
810                 UPDATE_CACHE(re, &s->gb);
811                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
812                 if (level == -128) {
813                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
814                 } else if (level == 0) {
815                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
816                 }
817                 i += run;
818                 j = scantable[i];
819                 if(level<0){
820                     level= -level;
821                     level= ((level*2+1)*qscale)>>1;
822                     level= (level-1)|1;
823                     level= -level;
824                 }else{
825                     level= ((level*2+1)*qscale)>>1;
826                     level= (level-1)|1;
827                 }
828             }
829
830             block[j] = level;
831             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
832                 break;
833             UPDATE_CACHE(re, &s->gb);
834         }
835 end:
836         LAST_SKIP_BITS(re, &s->gb, 2);
837         CLOSE_READER(re, &s->gb);
838     }
839     s->block_last_index[n] = i;
840     return 0;
841 }
842
843
844 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
845                                DCTELEM *block,
846                                int n)
847 {
848     int level, i, j, run;
849     RLTable *rl = &ff_rl_mpeg1;
850     uint8_t * const scantable= s->intra_scantable.permutated;
851     const uint16_t *quant_matrix;
852     const int qscale= s->qscale;
853     int mismatch;
854
855     mismatch = 1;
856
857     {
858         OPEN_READER(re, &s->gb);
859         i = -1;
860         if (n < 4)
861             quant_matrix = s->inter_matrix;
862         else
863             quant_matrix = s->chroma_inter_matrix;
864
865         // special case for first coefficient, no need to add second VLC table
866         UPDATE_CACHE(re, &s->gb);
867         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
868             level= (3*qscale*quant_matrix[0])>>5;
869             if(GET_CACHE(re, &s->gb)&0x40000000)
870                 level= -level;
871             block[0] = level;
872             mismatch ^= level;
873             i++;
874             SKIP_BITS(re, &s->gb, 2);
875             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
876                 goto end;
877         }
878
879         /* now quantify & encode AC coefficients */
880         for(;;) {
881             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
882
883             if(level != 0) {
884                 i += run;
885                 j = scantable[i];
886                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
887                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
888                 SKIP_BITS(re, &s->gb, 1);
889             } else {
890                 /* escape */
891                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
892                 UPDATE_CACHE(re, &s->gb);
893                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
894
895                 i += run;
896                 j = scantable[i];
897                 if(level<0){
898                     level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
899                     level= -level;
900                 }else{
901                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
902                 }
903             }
904             if (i > 63){
905                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
906                 return -1;
907             }
908
909             mismatch ^= level;
910             block[j] = level;
911             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
912                 break;
913             UPDATE_CACHE(re, &s->gb);
914         }
915 end:
916         LAST_SKIP_BITS(re, &s->gb, 2);
917         CLOSE_READER(re, &s->gb);
918     }
919     block[63] ^= (mismatch & 1);
920
921     s->block_last_index[n] = i;
922     return 0;
923 }
924
925 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
926                                DCTELEM *block,
927                                int n)
928 {
929     int level, i, j, run;
930     RLTable *rl = &ff_rl_mpeg1;
931     uint8_t * const scantable= s->intra_scantable.permutated;
932     const int qscale= s->qscale;
933     OPEN_READER(re, &s->gb);
934     i = -1;
935
936     // special case for first coefficient, no need to add second VLC table
937     UPDATE_CACHE(re, &s->gb);
938     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
939         level= (3*qscale)>>1;
940         if(GET_CACHE(re, &s->gb)&0x40000000)
941             level= -level;
942         block[0] = level;
943         i++;
944         SKIP_BITS(re, &s->gb, 2);
945         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
946             goto end;
947     }
948
949     /* now quantify & encode AC coefficients */
950     for(;;) {
951         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
952
953         if(level != 0) {
954             i += run;
955             j = scantable[i];
956             level= ((level*2+1)*qscale)>>1;
957             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
958             SKIP_BITS(re, &s->gb, 1);
959         } else {
960             /* escape */
961             run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
962             UPDATE_CACHE(re, &s->gb);
963             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
964
965             i += run;
966             j = scantable[i];
967             if(level<0){
968                 level= ((-level*2+1)*qscale)>>1;
969                 level= -level;
970             }else{
971                 level= ((level*2+1)*qscale)>>1;
972             }
973         }
974
975         block[j] = level;
976         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
977             break;
978         UPDATE_CACHE(re, &s->gb);
979     }
980 end:
981     LAST_SKIP_BITS(re, &s->gb, 2);
982     CLOSE_READER(re, &s->gb);
983     s->block_last_index[n] = i;
984     return 0;
985 }
986
987
988 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
989                                DCTELEM *block,
990                                int n)
991 {
992     int level, dc, diff, i, j, run;
993     int component;
994     RLTable *rl;
995     uint8_t * const scantable= s->intra_scantable.permutated;
996     const uint16_t *quant_matrix;
997     const int qscale= s->qscale;
998     int mismatch;
999
1000     /* DC coefficient */
1001     if (n < 4){
1002         quant_matrix = s->intra_matrix;
1003         component = 0;
1004     }else{
1005         quant_matrix = s->chroma_intra_matrix;
1006         component = (n&1) + 1;
1007     }
1008     diff = decode_dc(&s->gb, component);
1009     if (diff >= 0xffff)
1010         return -1;
1011     dc = s->last_dc[component];
1012     dc += diff;
1013     s->last_dc[component] = dc;
1014     block[0] = dc << (3 - s->intra_dc_precision);
1015     av_dlog(s->avctx, "dc=%d\n", block[0]);
1016     mismatch = block[0] ^ 1;
1017     i = 0;
1018     if (s->intra_vlc_format)
1019         rl = &ff_rl_mpeg2;
1020     else
1021         rl = &ff_rl_mpeg1;
1022
1023     {
1024         OPEN_READER(re, &s->gb);
1025         /* now quantify & encode AC coefficients */
1026         for(;;) {
1027             UPDATE_CACHE(re, &s->gb);
1028             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1029
1030             if(level == 127){
1031                 break;
1032             } else if(level != 0) {
1033                 i += run;
1034                 j = scantable[i];
1035                 level= (level*qscale*quant_matrix[j])>>4;
1036                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1037                 LAST_SKIP_BITS(re, &s->gb, 1);
1038             } else {
1039                 /* escape */
1040                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1041                 UPDATE_CACHE(re, &s->gb);
1042                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1043                 i += run;
1044                 j = scantable[i];
1045                 if(level<0){
1046                     level= (-level*qscale*quant_matrix[j])>>4;
1047                     level= -level;
1048                 }else{
1049                     level= (level*qscale*quant_matrix[j])>>4;
1050                 }
1051             }
1052             if (i > 63){
1053                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1054                 return -1;
1055             }
1056
1057             mismatch^= level;
1058             block[j] = level;
1059         }
1060         CLOSE_READER(re, &s->gb);
1061     }
1062     block[63]^= mismatch&1;
1063
1064     s->block_last_index[n] = i;
1065     return 0;
1066 }
1067
1068 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1069                                DCTELEM *block,
1070                                int n)
1071 {
1072     int level, dc, diff, j, run;
1073     int component;
1074     RLTable *rl;
1075     uint8_t * scantable= s->intra_scantable.permutated;
1076     const uint16_t *quant_matrix;
1077     const int qscale= s->qscale;
1078
1079     /* DC coefficient */
1080     if (n < 4){
1081         quant_matrix = s->intra_matrix;
1082         component = 0;
1083     }else{
1084         quant_matrix = s->chroma_intra_matrix;
1085         component = (n&1) + 1;
1086     }
1087     diff = decode_dc(&s->gb, component);
1088     if (diff >= 0xffff)
1089         return -1;
1090     dc = s->last_dc[component];
1091     dc += diff;
1092     s->last_dc[component] = dc;
1093     block[0] = dc << (3 - s->intra_dc_precision);
1094     if (s->intra_vlc_format)
1095         rl = &ff_rl_mpeg2;
1096     else
1097         rl = &ff_rl_mpeg1;
1098
1099     {
1100         OPEN_READER(re, &s->gb);
1101         /* now quantify & encode AC coefficients */
1102         for(;;) {
1103             UPDATE_CACHE(re, &s->gb);
1104             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1105
1106             if(level == 127){
1107                 break;
1108             } else if(level != 0) {
1109                 scantable += run;
1110                 j = *scantable;
1111                 level= (level*qscale*quant_matrix[j])>>4;
1112                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1113                 LAST_SKIP_BITS(re, &s->gb, 1);
1114             } else {
1115                 /* escape */
1116                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1117                 UPDATE_CACHE(re, &s->gb);
1118                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1119                 scantable += run;
1120                 j = *scantable;
1121                 if(level<0){
1122                     level= (-level*qscale*quant_matrix[j])>>4;
1123                     level= -level;
1124                 }else{
1125                     level= (level*qscale*quant_matrix[j])>>4;
1126                 }
1127             }
1128
1129             block[j] = level;
1130         }
1131         CLOSE_READER(re, &s->gb);
1132     }
1133
1134     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1135     return 0;
1136 }
1137
1138 typedef struct Mpeg1Context {
1139     MpegEncContext mpeg_enc_ctx;
1140     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1141     int repeat_field; /* true if we must repeat the field */
1142     AVPanScan pan_scan;              /**< some temporary storage for the panscan */
1143     int slice_count;
1144     int swap_uv;//indicate VCR2
1145     int save_aspect_info;
1146     int save_width, save_height, save_progressive_seq;
1147     AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
1148     int sync;                        ///< Did we reach a sync point like a GOP/SEQ/KEYFrame?
1149 } Mpeg1Context;
1150
1151 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1152 {
1153     Mpeg1Context *s = avctx->priv_data;
1154     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1155     int i;
1156
1157     /* we need some permutation to store matrices,
1158      * until MPV_common_init() sets the real permutation. */
1159     for(i=0;i<64;i++)
1160        s2->dsp.idct_permutation[i]=i;
1161
1162     MPV_decode_defaults(s2);
1163
1164     s->mpeg_enc_ctx.avctx= avctx;
1165     s->mpeg_enc_ctx.flags= avctx->flags;
1166     s->mpeg_enc_ctx.flags2= avctx->flags2;
1167     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1168     ff_mpeg12_init_vlcs();
1169
1170     s->mpeg_enc_ctx_allocated = 0;
1171     s->mpeg_enc_ctx.picture_number = 0;
1172     s->repeat_field = 0;
1173     s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1174     avctx->color_range= AVCOL_RANGE_MPEG;
1175     if (avctx->codec->id == CODEC_ID_MPEG1VIDEO)
1176         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1177     else
1178         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1179     return 0;
1180 }
1181
1182 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1183                                      const uint8_t *new_perm){
1184     uint16_t temp_matrix[64];
1185     int i;
1186
1187     memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1188
1189     for(i=0;i<64;i++){
1190         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1191     }
1192 }
1193
1194 static enum PixelFormat mpeg_get_pixelformat(AVCodecContext *avctx){
1195     Mpeg1Context *s1 = avctx->priv_data;
1196     MpegEncContext *s = &s1->mpeg_enc_ctx;
1197
1198     if(avctx->xvmc_acceleration)
1199         return avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1200     else if(avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU){
1201         if(avctx->codec_id == CODEC_ID_MPEG1VIDEO)
1202             return PIX_FMT_VDPAU_MPEG1;
1203         else
1204             return PIX_FMT_VDPAU_MPEG2;
1205     }else{
1206         if(s->chroma_format <  2)
1207             return avctx->get_format(avctx,ff_hwaccel_pixfmt_list_420);
1208         else if(s->chroma_format == 2)
1209             return PIX_FMT_YUV422P;
1210         else
1211             return PIX_FMT_YUV444P;
1212     }
1213 }
1214
1215 /* Call this function when we know all parameters.
1216  * It may be called in different places for MPEG-1 and MPEG-2. */
1217 static int mpeg_decode_postinit(AVCodecContext *avctx){
1218     Mpeg1Context *s1 = avctx->priv_data;
1219     MpegEncContext *s = &s1->mpeg_enc_ctx;
1220     uint8_t old_permutation[64];
1221
1222     if (
1223         (s1->mpeg_enc_ctx_allocated == 0)||
1224         avctx->coded_width  != s->width ||
1225         avctx->coded_height != s->height||
1226         s1->save_width != s->width ||
1227         s1->save_height != s->height ||
1228         s1->save_aspect_info != s->aspect_ratio_info||
1229         s1->save_progressive_seq != s->progressive_sequence ||
1230         0)
1231     {
1232
1233         if (s1->mpeg_enc_ctx_allocated) {
1234             ParseContext pc= s->parse_context;
1235             s->parse_context.buffer=0;
1236             MPV_common_end(s);
1237             s->parse_context= pc;
1238         }
1239
1240         if( (s->width == 0 )||(s->height == 0))
1241             return -2;
1242
1243         avcodec_set_dimensions(avctx, s->width, s->height);
1244         avctx->bit_rate = s->bit_rate;
1245         s1->save_aspect_info = s->aspect_ratio_info;
1246         s1->save_width = s->width;
1247         s1->save_height = s->height;
1248         s1->save_progressive_seq = s->progressive_sequence;
1249
1250         /* low_delay may be forced, in this case we will have B-frames
1251          * that behave like P-frames. */
1252         avctx->has_b_frames = !(s->low_delay);
1253
1254         assert((avctx->sub_id==1) == (avctx->codec_id==CODEC_ID_MPEG1VIDEO));
1255         if(avctx->codec_id==CODEC_ID_MPEG1VIDEO){
1256             //MPEG-1 fps
1257             avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1258             avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1259             //MPEG-1 aspect
1260             avctx->sample_aspect_ratio= av_d2q(
1261                     1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1262             avctx->ticks_per_frame=1;
1263         }else{//MPEG-2
1264         //MPEG-2 fps
1265             av_reduce(
1266                 &s->avctx->time_base.den,
1267                 &s->avctx->time_base.num,
1268                 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1269                 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1270                 1<<30);
1271             avctx->ticks_per_frame=2;
1272         //MPEG-2 aspect
1273             if(s->aspect_ratio_info > 1){
1274                 //we ignore the spec here as reality does not match the spec, see for example
1275                 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1276                 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) || 1){
1277                     s->avctx->sample_aspect_ratio=
1278                         av_div_q(
1279                          ff_mpeg2_aspect[s->aspect_ratio_info],
1280                          (AVRational){s->width, s->height}
1281                          );
1282                 }else{
1283                     s->avctx->sample_aspect_ratio=
1284                         av_div_q(
1285                          ff_mpeg2_aspect[s->aspect_ratio_info],
1286                          (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1287                         );
1288                 }
1289             }else{
1290                 s->avctx->sample_aspect_ratio=
1291                     ff_mpeg2_aspect[s->aspect_ratio_info];
1292             }
1293         }//MPEG-2
1294
1295         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1296         avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1297         //until then pix_fmt may be changed right after codec init
1298         if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
1299             avctx->hwaccel ||
1300             s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
1301             if( avctx->idct_algo == FF_IDCT_AUTO )
1302                 avctx->idct_algo = FF_IDCT_SIMPLE;
1303
1304         /* Quantization matrices may need reordering
1305          * if DCT permutation is changed. */
1306         memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1307
1308         if (MPV_common_init(s) < 0)
1309             return -2;
1310
1311         quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
1312         quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
1313         quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1314         quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1315
1316         s1->mpeg_enc_ctx_allocated = 1;
1317     }
1318     return 0;
1319 }
1320
1321 static int mpeg1_decode_picture(AVCodecContext *avctx,
1322                                 const uint8_t *buf, int buf_size)
1323 {
1324     Mpeg1Context *s1 = avctx->priv_data;
1325     MpegEncContext *s = &s1->mpeg_enc_ctx;
1326     int ref, f_code, vbv_delay;
1327
1328     init_get_bits(&s->gb, buf, buf_size*8);
1329
1330     ref = get_bits(&s->gb, 10); /* temporal ref */
1331     s->pict_type = get_bits(&s->gb, 3);
1332     if(s->pict_type == 0 || s->pict_type > 3)
1333         return -1;
1334
1335     vbv_delay= get_bits(&s->gb, 16);
1336     if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
1337         s->full_pel[0] = get_bits1(&s->gb);
1338         f_code = get_bits(&s->gb, 3);
1339         if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1340             return -1;
1341         s->mpeg_f_code[0][0] = f_code;
1342         s->mpeg_f_code[0][1] = f_code;
1343     }
1344     if (s->pict_type == FF_B_TYPE) {
1345         s->full_pel[1] = get_bits1(&s->gb);
1346         f_code = get_bits(&s->gb, 3);
1347         if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1348             return -1;
1349         s->mpeg_f_code[1][0] = f_code;
1350         s->mpeg_f_code[1][1] = f_code;
1351     }
1352     s->current_picture.pict_type= s->pict_type;
1353     s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1354
1355     if(avctx->debug & FF_DEBUG_PICT_INFO)
1356         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1357
1358     s->y_dc_scale = 8;
1359     s->c_dc_scale = 8;
1360     return 0;
1361 }
1362
1363 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1364 {
1365     MpegEncContext *s= &s1->mpeg_enc_ctx;
1366     int horiz_size_ext, vert_size_ext;
1367     int bit_rate_ext;
1368
1369     skip_bits(&s->gb, 1); /* profile and level esc*/
1370     s->avctx->profile= get_bits(&s->gb, 3);
1371     s->avctx->level= get_bits(&s->gb, 4);
1372     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1373     s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1374     horiz_size_ext = get_bits(&s->gb, 2);
1375     vert_size_ext = get_bits(&s->gb, 2);
1376     s->width |= (horiz_size_ext << 12);
1377     s->height |= (vert_size_ext << 12);
1378     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1379     s->bit_rate += (bit_rate_ext << 18) * 400;
1380     skip_bits1(&s->gb); /* marker */
1381     s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1382
1383     s->low_delay = get_bits1(&s->gb);
1384     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1385
1386     s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1387     s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1388
1389     av_dlog(s->avctx, "sequence extension\n");
1390     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1391     s->avctx->sub_id = 2; /* indicates MPEG-2 found */
1392
1393     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1394         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1395                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1396
1397 }
1398
1399 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1400 {
1401     MpegEncContext *s= &s1->mpeg_enc_ctx;
1402     int color_description, w, h;
1403
1404     skip_bits(&s->gb, 3); /* video format */
1405     color_description= get_bits1(&s->gb);
1406     if(color_description){
1407         s->avctx->color_primaries= get_bits(&s->gb, 8);
1408         s->avctx->color_trc      = get_bits(&s->gb, 8);
1409         s->avctx->colorspace     = get_bits(&s->gb, 8);
1410     }
1411     w= get_bits(&s->gb, 14);
1412     skip_bits(&s->gb, 1); //marker
1413     h= get_bits(&s->gb, 14);
1414     // remaining 3 bits are zero padding
1415
1416     s1->pan_scan.width= 16*w;
1417     s1->pan_scan.height=16*h;
1418
1419     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1420         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1421 }
1422
1423 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1424 {
1425     MpegEncContext *s= &s1->mpeg_enc_ctx;
1426     int i,nofco;
1427
1428     nofco = 1;
1429     if(s->progressive_sequence){
1430         if(s->repeat_first_field){
1431             nofco++;
1432             if(s->top_field_first)
1433                 nofco++;
1434         }
1435     }else{
1436         if(s->picture_structure == PICT_FRAME){
1437             nofco++;
1438             if(s->repeat_first_field)
1439                 nofco++;
1440         }
1441     }
1442     for(i=0; i<nofco; i++){
1443         s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1444         skip_bits(&s->gb, 1); //marker
1445         s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1446         skip_bits(&s->gb, 1); //marker
1447     }
1448
1449     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1450         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1451             s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1452             s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1453             s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1454         );
1455 }
1456
1457 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra){
1458     int i;
1459
1460     for(i=0; i<64; i++) {
1461         int j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1462         int v = get_bits(&s->gb, 8);
1463         if(v==0){
1464             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1465             return -1;
1466         }
1467         if(intra && i==0 && v!=8){
1468             av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
1469             v= 8; // needed by pink.mpg / issue1046
1470         }
1471         matrix0[j] = v;
1472         if(matrix1)
1473             matrix1[j] = v;
1474     }
1475     return 0;
1476 }
1477
1478 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1479 {
1480     av_dlog(s->avctx, "matrix extension\n");
1481
1482     if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1483     if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1484     if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL           , 1);
1485     if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL           , 0);
1486 }
1487
1488 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1489 {
1490     MpegEncContext *s= &s1->mpeg_enc_ctx;
1491
1492     s->full_pel[0] = s->full_pel[1] = 0;
1493     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1494     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1495     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1496     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1497     if(!s->pict_type && s1->mpeg_enc_ctx_allocated){
1498         av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1499         if(s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1]==15){
1500             if(s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1501                 s->pict_type= FF_I_TYPE;
1502             else
1503                 s->pict_type= FF_P_TYPE;
1504         }else
1505             s->pict_type= FF_B_TYPE;
1506         s->current_picture.pict_type= s->pict_type;
1507         s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1508     }
1509     s->intra_dc_precision = get_bits(&s->gb, 2);
1510     s->picture_structure = get_bits(&s->gb, 2);
1511     s->top_field_first = get_bits1(&s->gb);
1512     s->frame_pred_frame_dct = get_bits1(&s->gb);
1513     s->concealment_motion_vectors = get_bits1(&s->gb);
1514     s->q_scale_type = get_bits1(&s->gb);
1515     s->intra_vlc_format = get_bits1(&s->gb);
1516     s->alternate_scan = get_bits1(&s->gb);
1517     s->repeat_first_field = get_bits1(&s->gb);
1518     s->chroma_420_type = get_bits1(&s->gb);
1519     s->progressive_frame = get_bits1(&s->gb);
1520
1521     if(s->progressive_sequence && !s->progressive_frame){
1522         s->progressive_frame= 1;
1523         av_log(s->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
1524     }
1525
1526     if(s->picture_structure==0 || (s->progressive_frame && s->picture_structure!=PICT_FRAME)){
1527         av_log(s->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s->picture_structure);
1528         s->picture_structure= PICT_FRAME;
1529     }
1530
1531     if(s->progressive_sequence && !s->frame_pred_frame_dct){
1532         av_log(s->avctx, AV_LOG_ERROR, "invalid frame_pred_frame_dct\n");
1533         s->frame_pred_frame_dct= 1;
1534     }
1535
1536     if(s->picture_structure == PICT_FRAME){
1537         s->first_field=0;
1538         s->v_edge_pos= 16*s->mb_height;
1539     }else{
1540         s->first_field ^= 1;
1541         s->v_edge_pos=  8*s->mb_height;
1542         memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1543     }
1544
1545     if(s->alternate_scan){
1546         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
1547         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
1548     }else{
1549         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
1550         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
1551     }
1552
1553     /* composite display not parsed */
1554     av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1555     av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1556     av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1557     av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1558     av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1559     av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1560     av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1561     av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1562     av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1563 }
1564
1565 static void exchange_uv(MpegEncContext *s){
1566     DCTELEM (*tmp)[64];
1567
1568     tmp           = s->pblocks[4];
1569     s->pblocks[4] = s->pblocks[5];
1570     s->pblocks[5] = tmp;
1571 }
1572
1573 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size){
1574     AVCodecContext *avctx= s->avctx;
1575     Mpeg1Context *s1 = (Mpeg1Context*)s;
1576
1577     /* start frame decoding */
1578     if(s->first_field || s->picture_structure==PICT_FRAME){
1579         if(MPV_frame_start(s, avctx) < 0)
1580             return -1;
1581
1582         ff_er_frame_start(s);
1583
1584         /* first check if we must repeat the frame */
1585         s->current_picture_ptr->repeat_pict = 0;
1586         if (s->repeat_first_field) {
1587             if (s->progressive_sequence) {
1588                 if (s->top_field_first)
1589                     s->current_picture_ptr->repeat_pict = 4;
1590                 else
1591                     s->current_picture_ptr->repeat_pict = 2;
1592             } else if (s->progressive_frame) {
1593                 s->current_picture_ptr->repeat_pict = 1;
1594             }
1595         }
1596
1597         *s->current_picture_ptr->pan_scan= s1->pan_scan;
1598     }else{ //second field
1599             int i;
1600
1601             if(!s->current_picture_ptr){
1602                 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1603                 return -1;
1604             }
1605
1606             for(i=0; i<4; i++){
1607                 s->current_picture.data[i] = s->current_picture_ptr->data[i];
1608                 if(s->picture_structure == PICT_BOTTOM_FIELD){
1609                     s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1610                 }
1611             }
1612     }
1613
1614     if (avctx->hwaccel) {
1615         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1616             return -1;
1617     }
1618
1619 // MPV_frame_start will call this function too,
1620 // but we need to call it on every field
1621     if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1622         if(ff_xvmc_field_start(s,avctx) < 0)
1623             return -1;
1624
1625     return 0;
1626 }
1627
1628 #define DECODE_SLICE_ERROR -1
1629 #define DECODE_SLICE_OK 0
1630
1631 /**
1632  * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1633  * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1634  *         DECODE_SLICE_OK if this slice is ok<br>
1635  */
1636 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1637                              const uint8_t **buf, int buf_size)
1638 {
1639     MpegEncContext *s = &s1->mpeg_enc_ctx;
1640     AVCodecContext *avctx= s->avctx;
1641     const int field_pic= s->picture_structure != PICT_FRAME;
1642     const int lowres= s->avctx->lowres;
1643
1644     s->resync_mb_x=
1645     s->resync_mb_y= -1;
1646
1647     assert(mb_y < s->mb_height);
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     if(mb_y==0 && s->codec_tag == AV_RL32("SLIF")){
1669         skip_bits1(&s->gb);
1670     }else{
1671         for(;;) {
1672             int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1673             if (code < 0){
1674                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1675                 return -1;
1676             }
1677             if (code >= 33) {
1678                 if (code == 33) {
1679                     s->mb_x += 33;
1680                 }
1681                 /* otherwise, stuffing, nothing to do */
1682             } else {
1683                 s->mb_x += code;
1684                 break;
1685             }
1686         }
1687     }
1688
1689     if(s->mb_x >= (unsigned)s->mb_width){
1690         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1691         return -1;
1692     }
1693
1694     if (avctx->hwaccel) {
1695         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1696         int start_code = -1;
1697         buf_end = ff_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1698         if (buf_end < *buf + buf_size)
1699             buf_end -= 4;
1700         s->mb_y = mb_y;
1701         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1702             return DECODE_SLICE_ERROR;
1703         *buf = buf_end;
1704         return DECODE_SLICE_OK;
1705     }
1706
1707     s->resync_mb_x= s->mb_x;
1708     s->resync_mb_y= s->mb_y= mb_y;
1709     s->mb_skip_run= 0;
1710     ff_init_block_index(s);
1711
1712     if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1713         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1714              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",
1715                  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],
1716                  s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")),
1717                  s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1718                  s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1719                  s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1720         }
1721     }
1722
1723     for(;;) {
1724         //If 1, we memcpy blocks in xvmcvideo.
1725         if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1726             ff_xvmc_init_block(s);//set s->block
1727
1728         if(mpeg_decode_mb(s, s->block) < 0)
1729             return -1;
1730
1731         if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1732             const int wrap = s->b8_stride;
1733             int xy = s->mb_x*2 + s->mb_y*2*wrap;
1734             int b8_xy= 4*(s->mb_x + s->mb_y*s->mb_stride);
1735             int motion_x, motion_y, dir, i;
1736
1737             for(i=0; i<2; i++){
1738                 for(dir=0; dir<2; dir++){
1739                     if (s->mb_intra || (dir==1 && s->pict_type != FF_B_TYPE)) {
1740                         motion_x = motion_y = 0;
1741                     }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1742                         motion_x = s->mv[dir][0][0];
1743                         motion_y = s->mv[dir][0][1];
1744                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1745                         motion_x = s->mv[dir][i][0];
1746                         motion_y = s->mv[dir][i][1];
1747                     }
1748
1749                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1750                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1751                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1752                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1753                     s->current_picture.ref_index [dir][b8_xy    ]=
1754                     s->current_picture.ref_index [dir][b8_xy + 1]= s->field_select[dir][i];
1755                     assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1756                 }
1757                 xy += wrap;
1758                 b8_xy +=2;
1759             }
1760         }
1761
1762         s->dest[0] += 16 >> lowres;
1763         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1764         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1765
1766         MPV_decode_mb(s, s->block);
1767
1768         if (++s->mb_x >= s->mb_width) {
1769             const int mb_size= 16>>s->avctx->lowres;
1770
1771             ff_draw_horiz_band(s, mb_size*(s->mb_y>>field_pic), mb_size);
1772
1773             s->mb_x = 0;
1774             s->mb_y += 1<<field_pic;
1775
1776             if(s->mb_y >= s->mb_height){
1777                 int left= get_bits_left(&s->gb);
1778                 int is_d10= s->chroma_format==2 && s->pict_type==FF_I_TYPE && avctx->profile==0 && avctx->level==5
1779                             && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1780                             && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1781
1782                 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1783                    || (avctx->error_recognition >= FF_ER_AGGRESSIVE && left>8)){
1784                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1785                     return -1;
1786                 }else
1787                     goto eos;
1788             }
1789
1790             ff_init_block_index(s);
1791         }
1792
1793         /* skip mb handling */
1794         if (s->mb_skip_run == -1) {
1795             /* read increment again */
1796             s->mb_skip_run = 0;
1797             for(;;) {
1798                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1799                 if (code < 0){
1800                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1801                     return -1;
1802                 }
1803                 if (code >= 33) {
1804                     if (code == 33) {
1805                         s->mb_skip_run += 33;
1806                     }else if(code == 35){
1807                         if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1808                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1809                             return -1;
1810                         }
1811                         goto eos; /* end of slice */
1812                     }
1813                     /* otherwise, stuffing, nothing to do */
1814                 } else {
1815                     s->mb_skip_run += code;
1816                     break;
1817                 }
1818             }
1819             if(s->mb_skip_run){
1820                 int i;
1821                 if(s->pict_type == FF_I_TYPE){
1822                     av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1823                     return -1;
1824                 }
1825
1826                 /* skip mb */
1827                 s->mb_intra = 0;
1828                 for(i=0;i<12;i++)
1829                     s->block_last_index[i] = -1;
1830                 if(s->picture_structure == PICT_FRAME)
1831                     s->mv_type = MV_TYPE_16X16;
1832                 else
1833                     s->mv_type = MV_TYPE_FIELD;
1834                 if (s->pict_type == FF_P_TYPE) {
1835                     /* if P type, zero motion vector is implied */
1836                     s->mv_dir = MV_DIR_FORWARD;
1837                     s->mv[0][0][0] = s->mv[0][0][1] = 0;
1838                     s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1839                     s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1840                     s->field_select[0][0]= (s->picture_structure - 1) & 1;
1841                 } else {
1842                     /* if B type, reuse previous vectors and directions */
1843                     s->mv[0][0][0] = s->last_mv[0][0][0];
1844                     s->mv[0][0][1] = s->last_mv[0][0][1];
1845                     s->mv[1][0][0] = s->last_mv[1][0][0];
1846                     s->mv[1][0][1] = s->last_mv[1][0][1];
1847                 }
1848             }
1849         }
1850     }
1851 eos: // end of slice
1852     *buf += (get_bits_count(&s->gb)-1)/8;
1853 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1854     return 0;
1855 }
1856
1857 static int slice_decode_thread(AVCodecContext *c, void *arg){
1858     MpegEncContext *s= *(void**)arg;
1859     const uint8_t *buf= s->gb.buffer;
1860     int mb_y= s->start_mb_y;
1861     const int field_pic= s->picture_structure != PICT_FRAME;
1862
1863     s->error_count= (3*(s->end_mb_y - s->start_mb_y)*s->mb_width) >> field_pic;
1864
1865     for(;;){
1866         uint32_t start_code;
1867         int ret;
1868
1869         ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1870         emms_c();
1871 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1872 //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);
1873         if(ret < 0){
1874             if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1875                 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);
1876         }else{
1877             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);
1878         }
1879
1880         if(s->mb_y == s->end_mb_y)
1881             return 0;
1882
1883         start_code= -1;
1884         buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1885         mb_y= (start_code - SLICE_MIN_START_CODE) << field_pic;
1886         if (s->picture_structure == PICT_BOTTOM_FIELD)
1887             mb_y++;
1888         if(mb_y < 0 || mb_y >= s->end_mb_y)
1889             return -1;
1890     }
1891
1892     return 0; //not reached
1893 }
1894
1895 /**
1896  * Handle slice ends.
1897  * @return 1 if it seems to be the last slice
1898  */
1899 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1900 {
1901     Mpeg1Context *s1 = avctx->priv_data;
1902     MpegEncContext *s = &s1->mpeg_enc_ctx;
1903
1904     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1905         return 0;
1906
1907     if (s->avctx->hwaccel) {
1908         if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1909             av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1910     }
1911
1912     if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1913         ff_xvmc_field_end(s);
1914
1915     /* end of slice reached */
1916     if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1917         /* end of image */
1918
1919         s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1920
1921         ff_er_frame_end(s);
1922
1923         MPV_frame_end(s);
1924
1925         if (s->pict_type == FF_B_TYPE || s->low_delay) {
1926             *pict= *(AVFrame*)s->current_picture_ptr;
1927             ff_print_debug_info(s, pict);
1928         } else {
1929             s->picture_number++;
1930             /* latency of 1 frame for I- and P-frames */
1931             /* XXX: use another variable than picture_number */
1932             if (s->last_picture_ptr != NULL) {
1933                 *pict= *(AVFrame*)s->last_picture_ptr;
1934                  ff_print_debug_info(s, pict);
1935             }
1936         }
1937
1938         return 1;
1939     } else {
1940         return 0;
1941     }
1942 }
1943
1944 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1945                                  const uint8_t *buf, int buf_size)
1946 {
1947     Mpeg1Context *s1 = avctx->priv_data;
1948     MpegEncContext *s = &s1->mpeg_enc_ctx;
1949     int width,height;
1950     int i, v, j;
1951
1952     init_get_bits(&s->gb, buf, buf_size*8);
1953
1954     width = get_bits(&s->gb, 12);
1955     height = get_bits(&s->gb, 12);
1956     if (width <= 0 || height <= 0)
1957         return -1;
1958     s->aspect_ratio_info= get_bits(&s->gb, 4);
1959     if (s->aspect_ratio_info == 0) {
1960         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1961         if (avctx->error_recognition >= FF_ER_COMPLIANT)
1962             return -1;
1963     }
1964     s->frame_rate_index = get_bits(&s->gb, 4);
1965     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1966         return -1;
1967     s->bit_rate = get_bits(&s->gb, 18) * 400;
1968     if (get_bits1(&s->gb) == 0) /* marker */
1969         return -1;
1970     s->width = width;
1971     s->height = height;
1972
1973     s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
1974     skip_bits(&s->gb, 1);
1975
1976     /* get matrix */
1977     if (get_bits1(&s->gb)) {
1978         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1979     } else {
1980         for(i=0;i<64;i++) {
1981             j = s->dsp.idct_permutation[i];
1982             v = ff_mpeg1_default_intra_matrix[i];
1983             s->intra_matrix[j] = v;
1984             s->chroma_intra_matrix[j] = v;
1985         }
1986     }
1987     if (get_bits1(&s->gb)) {
1988         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1989     } else {
1990         for(i=0;i<64;i++) {
1991             int j= s->dsp.idct_permutation[i];
1992             v = ff_mpeg1_default_non_intra_matrix[i];
1993             s->inter_matrix[j] = v;
1994             s->chroma_inter_matrix[j] = v;
1995         }
1996     }
1997
1998     if(show_bits(&s->gb, 23) != 0){
1999         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2000         return -1;
2001     }
2002
2003     /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2004     s->progressive_sequence = 1;
2005     s->progressive_frame = 1;
2006     s->picture_structure = PICT_FRAME;
2007     s->frame_pred_frame_dct = 1;
2008     s->chroma_format = 1;
2009     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2010     avctx->sub_id = 1; /* indicates MPEG-1 */
2011     s->out_format = FMT_MPEG1;
2012     s->swap_uv = 0;//AFAIK VCR2 does not have SEQ_HEADER
2013     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2014
2015     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2016         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2017                s->avctx->rc_buffer_size, s->bit_rate);
2018
2019     return 0;
2020 }
2021
2022 static int vcr2_init_sequence(AVCodecContext *avctx)
2023 {
2024     Mpeg1Context *s1 = avctx->priv_data;
2025     MpegEncContext *s = &s1->mpeg_enc_ctx;
2026     int i, v;
2027
2028     /* start new MPEG-1 context decoding */
2029     s->out_format = FMT_MPEG1;
2030     if (s1->mpeg_enc_ctx_allocated) {
2031         MPV_common_end(s);
2032     }
2033     s->width  = avctx->coded_width;
2034     s->height = avctx->coded_height;
2035     avctx->has_b_frames= 0; //true?
2036     s->low_delay= 1;
2037
2038     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2039     avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2040
2041     if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel ||
2042         s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
2043         if( avctx->idct_algo == FF_IDCT_AUTO )
2044             avctx->idct_algo = FF_IDCT_SIMPLE;
2045
2046     if (MPV_common_init(s) < 0)
2047         return -1;
2048     exchange_uv(s);//common init reset pblocks, so we swap them here
2049     s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2050     s1->mpeg_enc_ctx_allocated = 1;
2051
2052     for(i=0;i<64;i++) {
2053         int j= s->dsp.idct_permutation[i];
2054         v = ff_mpeg1_default_intra_matrix[i];
2055         s->intra_matrix[j] = v;
2056         s->chroma_intra_matrix[j] = v;
2057
2058         v = ff_mpeg1_default_non_intra_matrix[i];
2059         s->inter_matrix[j] = v;
2060         s->chroma_inter_matrix[j] = v;
2061     }
2062
2063     s->progressive_sequence = 1;
2064     s->progressive_frame = 1;
2065     s->picture_structure = PICT_FRAME;
2066     s->frame_pred_frame_dct = 1;
2067     s->chroma_format = 1;
2068     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2069     avctx->sub_id = 2; /* indicates MPEG-2 */
2070     s1->save_width           = s->width;
2071     s1->save_height          = s->height;
2072     s1->save_progressive_seq = s->progressive_sequence;
2073     return 0;
2074 }
2075
2076
2077 static void mpeg_decode_user_data(AVCodecContext *avctx,
2078                                   const uint8_t *p, int buf_size)
2079 {
2080     const uint8_t *buf_end = p+buf_size;
2081
2082     /* we parse the DTG active format information */
2083     if (buf_end - p >= 5 &&
2084         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2085         int flags = p[4];
2086         p += 5;
2087         if (flags & 0x80) {
2088             /* skip event id */
2089             p += 2;
2090         }
2091         if (flags & 0x40) {
2092             if (buf_end - p < 1)
2093                 return;
2094             avctx->dtg_active_format = p[0] & 0x0f;
2095         }
2096     }
2097 }
2098
2099 static void mpeg_decode_gop(AVCodecContext *avctx,
2100                             const uint8_t *buf, int buf_size){
2101     Mpeg1Context *s1 = avctx->priv_data;
2102     MpegEncContext *s = &s1->mpeg_enc_ctx;
2103
2104     int drop_frame_flag;
2105     int time_code_hours, time_code_minutes;
2106     int time_code_seconds, time_code_pictures;
2107     int broken_link;
2108
2109     init_get_bits(&s->gb, buf, buf_size*8);
2110
2111     drop_frame_flag = get_bits1(&s->gb);
2112
2113     time_code_hours=get_bits(&s->gb,5);
2114     time_code_minutes = get_bits(&s->gb,6);
2115     skip_bits1(&s->gb);//marker bit
2116     time_code_seconds = get_bits(&s->gb,6);
2117     time_code_pictures = get_bits(&s->gb,6);
2118
2119     s->closed_gop = get_bits1(&s->gb);
2120     /*broken_link indicate that after editing the
2121       reference frames of the first B-Frames after GOP I-Frame
2122       are missing (open gop)*/
2123     broken_link = get_bits1(&s->gb);
2124
2125     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2126         av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2127             time_code_hours, time_code_minutes, time_code_seconds,
2128             time_code_pictures, s->closed_gop, broken_link);
2129 }
2130 /**
2131  * Find the end of the current frame in the bitstream.
2132  * @return the position of the first byte of the next frame, or -1
2133  */
2134 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2135 {
2136     int i;
2137     uint32_t state= pc->state;
2138
2139     /* EOF considered as end of frame */
2140     if (buf_size == 0)
2141         return 0;
2142
2143 /*
2144  0  frame start         -> 1/4
2145  1  first_SEQEXT        -> 0/2
2146  2  first field start   -> 3/0
2147  3  second_SEQEXT       -> 2/0
2148  4  searching end
2149 */
2150
2151     for(i=0; i<buf_size; i++){
2152         assert(pc->frame_start_found>=0 && pc->frame_start_found<=4);
2153         if(pc->frame_start_found&1){
2154             if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80)
2155                 pc->frame_start_found--;
2156             else if(state == EXT_START_CODE+2){
2157                 if((buf[i]&3) == 3) pc->frame_start_found= 0;
2158                 else                pc->frame_start_found= (pc->frame_start_found+1)&3;
2159             }
2160             state++;
2161         }else{
2162             i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2163             if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2164                 i++;
2165                 pc->frame_start_found=4;
2166             }
2167             if(state == SEQ_END_CODE){
2168                 pc->state=-1;
2169                 return i+1;
2170             }
2171             if(pc->frame_start_found==2 && state == SEQ_START_CODE)
2172                 pc->frame_start_found= 0;
2173             if(pc->frame_start_found<4 && state == EXT_START_CODE)
2174                 pc->frame_start_found++;
2175             if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){
2176                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2177                     pc->frame_start_found=0;
2178                     pc->state=-1;
2179                     return i-3;
2180                 }
2181             }
2182             if(pc->frame_start_found == 0 && s && state == PICTURE_START_CODE){
2183                 ff_fetch_timestamp(s, i-3, 1);
2184             }
2185         }
2186     }
2187     pc->state= state;
2188     return END_NOT_FOUND;
2189 }
2190
2191 static int decode_chunks(AVCodecContext *avctx,
2192                              AVFrame *picture, int *data_size,
2193                              const uint8_t *buf, int buf_size);
2194
2195 /* handle buffering and image synchronisation */
2196 static int mpeg_decode_frame(AVCodecContext *avctx,
2197                              void *data, int *data_size,
2198                              AVPacket *avpkt)
2199 {
2200     const uint8_t *buf = avpkt->data;
2201     int buf_size = avpkt->size;
2202     Mpeg1Context *s = avctx->priv_data;
2203     AVFrame *picture = data;
2204     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2205     av_dlog(avctx, "fill_buffer\n");
2206
2207     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2208         /* special case for last picture */
2209         if (s2->low_delay==0 && s2->next_picture_ptr) {
2210             *picture= *(AVFrame*)s2->next_picture_ptr;
2211             s2->next_picture_ptr= NULL;
2212
2213             *data_size = sizeof(AVFrame);
2214         }
2215         return buf_size;
2216     }
2217
2218     if(s2->flags&CODEC_FLAG_TRUNCATED){
2219         int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2220
2221         if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2222             return buf_size;
2223     }
2224
2225 #if 0
2226     if (s->repeat_field % 2 == 1) {
2227         s->repeat_field++;
2228         //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2229         //        s2->picture_number, s->repeat_field);
2230         if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2231             *data_size = sizeof(AVPicture);
2232             goto the_end;
2233         }
2234     }
2235 #endif
2236
2237     if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == AV_RL32("VCR2"))
2238         vcr2_init_sequence(avctx);
2239
2240     s->slice_count= 0;
2241
2242     if(avctx->extradata && !avctx->frame_number)
2243         decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2244
2245     return decode_chunks(avctx, picture, data_size, buf, buf_size);
2246 }
2247
2248 static int decode_chunks(AVCodecContext *avctx,
2249                              AVFrame *picture, int *data_size,
2250                              const uint8_t *buf, int buf_size)
2251 {
2252     Mpeg1Context *s = avctx->priv_data;
2253     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2254     const uint8_t *buf_ptr = buf;
2255     const uint8_t *buf_end = buf + buf_size;
2256     int ret, input_size;
2257     int last_code= 0;
2258
2259     for(;;) {
2260         /* find next start code */
2261         uint32_t start_code = -1;
2262         buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2263         if (start_code > 0x1ff){
2264             if(s2->pict_type != FF_B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2265                 if(avctx->thread_count > 1){
2266                     int i;
2267
2268                     avctx->execute(avctx, slice_decode_thread,  &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
2269                     for(i=0; i<s->slice_count; i++)
2270                         s2->error_count += s2->thread_context[i]->error_count;
2271                 }
2272
2273                 if (CONFIG_MPEG_VDPAU_DECODER && avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)
2274                     ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2275
2276                 if (slice_end(avctx, picture)) {
2277                     if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2278                         *data_size = sizeof(AVPicture);
2279                 }
2280             }
2281             s2->pict_type= 0;
2282             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2283         }
2284
2285         input_size = buf_end - buf_ptr;
2286
2287         if(avctx->debug & FF_DEBUG_STARTCODE){
2288             av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2289         }
2290
2291         /* prepare data for next start code */
2292         switch(start_code) {
2293         case SEQ_START_CODE:
2294             if(last_code == 0){
2295             mpeg1_decode_sequence(avctx, buf_ptr,
2296                                     input_size);
2297                 s->sync=1;
2298             }else{
2299                 av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2300             }
2301             break;
2302
2303         case PICTURE_START_CODE:
2304             if (HAVE_THREADS && (avctx->active_thread_type&FF_THREAD_SLICE) && s->slice_count) {
2305                 int i;
2306
2307                 avctx->execute(avctx, slice_decode_thread,
2308                                s2->thread_context, NULL,
2309                                s->slice_count, sizeof(void*));
2310                 for (i = 0; i < s->slice_count; i++)
2311                     s2->error_count += s2->thread_context[i]->error_count;
2312                 s->slice_count = 0;
2313             }
2314             if(last_code == 0 || last_code == SLICE_MIN_START_CODE){
2315             if(mpeg_decode_postinit(avctx) < 0){
2316                 av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
2317                 return -1;
2318             }
2319
2320             /* we have a complete image: we try to decompress it */
2321             if(mpeg1_decode_picture(avctx,
2322                                     buf_ptr, input_size) < 0)
2323                 s2->pict_type=0;
2324                 s2->first_slice = 1;
2325             last_code= PICTURE_START_CODE;
2326             }else{
2327                 av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
2328             }
2329             break;
2330         case EXT_START_CODE:
2331             init_get_bits(&s2->gb, buf_ptr, input_size*8);
2332
2333             switch(get_bits(&s2->gb, 4)) {
2334             case 0x1:
2335                 if(last_code == 0){
2336                 mpeg_decode_sequence_extension(s);
2337                 }else{
2338                     av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
2339                 }
2340                 break;
2341             case 0x2:
2342                 mpeg_decode_sequence_display_extension(s);
2343                 break;
2344             case 0x3:
2345                 mpeg_decode_quant_matrix_extension(s2);
2346                 break;
2347             case 0x7:
2348                 mpeg_decode_picture_display_extension(s);
2349                 break;
2350             case 0x8:
2351                 if(last_code == PICTURE_START_CODE){
2352                 mpeg_decode_picture_coding_extension(s);
2353                 }else{
2354                     av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
2355                 }
2356                 break;
2357             }
2358             break;
2359         case USER_START_CODE:
2360             mpeg_decode_user_data(avctx,
2361                                     buf_ptr, input_size);
2362             break;
2363         case GOP_START_CODE:
2364             if(last_code == 0){
2365             s2->first_field=0;
2366             mpeg_decode_gop(avctx,
2367                                     buf_ptr, input_size);
2368                 s->sync=1;
2369             }else{
2370                 av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
2371             }
2372             break;
2373         default:
2374             if (start_code >= SLICE_MIN_START_CODE &&
2375                 start_code <= SLICE_MAX_START_CODE && last_code!=0) {
2376                 const int field_pic= s2->picture_structure != PICT_FRAME;
2377                 int mb_y= (start_code - SLICE_MIN_START_CODE) << field_pic;
2378                 last_code= SLICE_MIN_START_CODE;
2379
2380                 if(s2->picture_structure == PICT_BOTTOM_FIELD)
2381                     mb_y++;
2382
2383                 if (mb_y >= s2->mb_height){
2384                     av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2385                     return -1;
2386                 }
2387
2388                 if(s2->last_picture_ptr==NULL){
2389                 /* Skip B-frames if we do not have reference frames and gop is not closed */
2390                     if(s2->pict_type==FF_B_TYPE){
2391                         if(!s2->closed_gop)
2392                             break;
2393                     }
2394                 }
2395                 if(s2->pict_type==FF_I_TYPE)
2396                     s->sync=1;
2397                 if(s2->next_picture_ptr==NULL){
2398                 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2399                     if(s2->pict_type==FF_P_TYPE && !s->sync) break;
2400                 }
2401 #if FF_API_HURRY_UP
2402                 /* Skip B-frames if we are in a hurry. */
2403                 if(avctx->hurry_up && s2->pict_type==FF_B_TYPE) break;
2404 #endif
2405                 if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==FF_B_TYPE)
2406                     ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=FF_I_TYPE)
2407                     || avctx->skip_frame >= AVDISCARD_ALL)
2408                     break;
2409 #if FF_API_HURRY_UP
2410                 /* Skip everything if we are in a hurry>=5. */
2411                 if(avctx->hurry_up>=5) break;
2412 #endif
2413
2414                 if (!s->mpeg_enc_ctx_allocated) break;
2415
2416                 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2417                     if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2418                         break;
2419                 }
2420
2421                 if(!s2->pict_type){
2422                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2423                     break;
2424                 }
2425
2426                 if(s2->first_slice){
2427                     s2->first_slice=0;
2428                     if(mpeg_field_start(s2, buf, buf_size) < 0)
2429                         return -1;
2430                 }
2431                 if(!s2->current_picture_ptr){
2432                     av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2433                     return -1;
2434                 }
2435
2436                 if (avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU) {
2437                     s->slice_count++;
2438                     break;
2439                 }
2440
2441                 if(avctx->thread_count > 1){
2442                     int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2443                     if(threshold <= mb_y){
2444                         MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2445
2446                         thread_context->start_mb_y= mb_y;
2447                         thread_context->end_mb_y  = s2->mb_height;
2448                         if(s->slice_count){
2449                             s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2450                             ff_update_duplicate_context(thread_context, s2);
2451                         }
2452                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2453                         s->slice_count++;
2454                     }
2455                     buf_ptr += 2; //FIXME add minimum number of bytes per slice
2456                 }else{
2457                     ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2458                     emms_c();
2459
2460                     if(ret < 0){
2461                         if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2462                             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);
2463                     }else{
2464                         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);
2465                     }
2466                 }
2467             }
2468             break;
2469         }
2470     }
2471 }
2472
2473 static void flush(AVCodecContext *avctx){
2474     Mpeg1Context *s = avctx->priv_data;
2475
2476     s->sync=0;
2477
2478     ff_mpeg_flush(avctx);
2479 }
2480
2481 static int mpeg_decode_end(AVCodecContext *avctx)
2482 {
2483     Mpeg1Context *s = avctx->priv_data;
2484
2485     if (s->mpeg_enc_ctx_allocated)
2486         MPV_common_end(&s->mpeg_enc_ctx);
2487     return 0;
2488 }
2489
2490 static const AVProfile mpeg2_video_profiles[] = {
2491     { FF_PROFILE_MPEG2_422,          "4:2:2"              },
2492     { FF_PROFILE_MPEG2_HIGH,         "High"               },
2493     { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
2494     { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
2495     { FF_PROFILE_MPEG2_MAIN,         "Main"               },
2496     { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
2497     { FF_PROFILE_RESERVED,           "Reserved"           },
2498     { FF_PROFILE_RESERVED,           "Reserved"           },
2499 };
2500
2501
2502 AVCodec ff_mpeg1video_decoder = {
2503     "mpeg1video",
2504     AVMEDIA_TYPE_VIDEO,
2505     CODEC_ID_MPEG1VIDEO,
2506     sizeof(Mpeg1Context),
2507     mpeg_decode_init,
2508     NULL,
2509     mpeg_decode_end,
2510     mpeg_decode_frame,
2511     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2512     .flush= flush,
2513     .max_lowres= 3,
2514     .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2515 };
2516
2517 AVCodec ff_mpeg2video_decoder = {
2518     "mpeg2video",
2519     AVMEDIA_TYPE_VIDEO,
2520     CODEC_ID_MPEG2VIDEO,
2521     sizeof(Mpeg1Context),
2522     mpeg_decode_init,
2523     NULL,
2524     mpeg_decode_end,
2525     mpeg_decode_frame,
2526     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2527     .flush= flush,
2528     .max_lowres= 3,
2529     .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2530     .profiles = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2531 };
2532
2533 //legacy decoder
2534 AVCodec ff_mpegvideo_decoder = {
2535     "mpegvideo",
2536     AVMEDIA_TYPE_VIDEO,
2537     CODEC_ID_MPEG2VIDEO,
2538     sizeof(Mpeg1Context),
2539     mpeg_decode_init,
2540     NULL,
2541     mpeg_decode_end,
2542     mpeg_decode_frame,
2543     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2544     .flush= flush,
2545     .max_lowres= 3,
2546     .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2547 };
2548
2549 #if CONFIG_MPEG_XVMC_DECODER
2550 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx){
2551     if( avctx->thread_count > 1)
2552         return -1;
2553     if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2554         return -1;
2555     if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2556         av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2557     }
2558     mpeg_decode_init(avctx);
2559
2560     avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2561     avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2562
2563     return 0;
2564 }
2565
2566 AVCodec ff_mpeg_xvmc_decoder = {
2567     "mpegvideo_xvmc",
2568     AVMEDIA_TYPE_VIDEO,
2569     CODEC_ID_MPEG2VIDEO_XVMC,
2570     sizeof(Mpeg1Context),
2571     mpeg_mc_decode_init,
2572     NULL,
2573     mpeg_decode_end,
2574     mpeg_decode_frame,
2575     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2576     .flush= flush,
2577     .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2578 };
2579
2580 #endif
2581
2582 #if CONFIG_MPEG_VDPAU_DECODER
2583 AVCodec ff_mpeg_vdpau_decoder = {
2584     "mpegvideo_vdpau",
2585     AVMEDIA_TYPE_VIDEO,
2586     CODEC_ID_MPEG2VIDEO,
2587     sizeof(Mpeg1Context),
2588     mpeg_decode_init,
2589     NULL,
2590     mpeg_decode_end,
2591     mpeg_decode_frame,
2592     CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2593     .flush= flush,
2594     .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2595 };
2596 #endif
2597
2598 #if CONFIG_MPEG1_VDPAU_DECODER
2599 AVCodec ff_mpeg1_vdpau_decoder = {
2600     "mpeg1video_vdpau",
2601     AVMEDIA_TYPE_VIDEO,
2602     CODEC_ID_MPEG1VIDEO,
2603     sizeof(Mpeg1Context),
2604     mpeg_decode_init,
2605     NULL,
2606     mpeg_decode_end,
2607     mpeg_decode_frame,
2608     CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2609     .flush= flush,
2610     .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2611 };
2612 #endif
2613