Update to MPlayer SVN rev 28800 and FFmpeg SVN rev 17752.
[vaapi:athaifas-mplayer.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 FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22
23 /**
24  * @file libavcodec/mpeg12.c
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_inter(MpegEncContext *s,
52                               DCTELEM *block,
53                               int n);
54 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
55 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
56                                         DCTELEM *block,
57                                         int n);
58 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
59                                     DCTELEM *block,
60                                     int n);
61 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
62 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
63 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
64 static void exchange_uv(MpegEncContext *s);
65
66 static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
67                                            PIX_FMT_XVMC_MPEG2_IDCT,
68                                            PIX_FMT_XVMC_MPEG2_MC,
69                                            PIX_FMT_NONE};
70
71 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
72
73
74 #define INIT_2D_VLC_RL(rl, static_size)\
75 {\
76     static RL_VLC_ELEM rl_vlc_table[static_size];\
77     INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
78              &rl.table_vlc[0][1], 4, 2,\
79              &rl.table_vlc[0][0], 4, 2, static_size);\
80 \
81     rl.rl_vlc[0]= rl_vlc_table;\
82     init_2d_vlc_rl(&rl);\
83 }
84
85 static void init_2d_vlc_rl(RLTable *rl)
86 {
87     int i;
88
89     for(i=0; i<rl->vlc.table_size; i++){
90         int code= rl->vlc.table[i][0];
91         int len = rl->vlc.table[i][1];
92         int level, run;
93
94         if(len==0){ // illegal code
95             run= 65;
96             level= MAX_LEVEL;
97         }else if(len<0){ //more bits needed
98             run= 0;
99             level= code;
100         }else{
101             if(code==rl->n){ //esc
102                 run= 65;
103                 level= 0;
104             }else if(code==rl->n+1){ //eob
105                 run= 0;
106                 level= 127;
107             }else{
108                 run=   rl->table_run  [code] + 1;
109                 level= rl->table_level[code];
110             }
111         }
112         rl->rl_vlc[0][i].len= len;
113         rl->rl_vlc[0][i].level= level;
114         rl->rl_vlc[0][i].run= run;
115     }
116 }
117
118 void ff_mpeg12_common_init(MpegEncContext *s)
119 {
120
121     s->y_dc_scale_table=
122     s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
123
124 }
125
126 void ff_mpeg1_clean_buffers(MpegEncContext *s){
127     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
128     s->last_dc[1] = s->last_dc[0];
129     s->last_dc[2] = s->last_dc[0];
130     memset(s->last_mv, 0, sizeof(s->last_mv));
131 }
132
133
134 /******************************************/
135 /* decoding */
136
137 static VLC mv_vlc;
138 static VLC mbincr_vlc;
139 static VLC mb_ptype_vlc;
140 static VLC mb_btype_vlc;
141 static VLC mb_pat_vlc;
142
143 av_cold void ff_mpeg12_init_vlcs(void)
144 {
145     static int done = 0;
146
147     if (!done) {
148         done = 1;
149
150         INIT_VLC_STATIC(&dc_lum_vlc, DC_VLC_BITS, 12,
151                  ff_mpeg12_vlc_dc_lum_bits, 1, 1,
152                  ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
153         INIT_VLC_STATIC(&dc_chroma_vlc,  DC_VLC_BITS, 12,
154                  ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
155                  ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
156         INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
157                  &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
158                  &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
159         INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
160                  &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
161                  &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
162         INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
163                  &ff_mpeg12_mbPatTable[0][1], 2, 1,
164                  &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
165
166         INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
167                  &table_mb_ptype[0][1], 2, 1,
168                  &table_mb_ptype[0][0], 2, 1, 64);
169         INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
170                  &table_mb_btype[0][1], 2, 1,
171                  &table_mb_btype[0][0], 2, 1, 64);
172         init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
173         init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
174
175         INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
176         INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
177     }
178 }
179
180 static inline int get_dmv(MpegEncContext *s)
181 {
182     if(get_bits1(&s->gb))
183         return 1 - (get_bits1(&s->gb) << 1);
184     else
185         return 0;
186 }
187
188 static inline int get_qscale(MpegEncContext *s)
189 {
190     int qscale = get_bits(&s->gb, 5);
191     if (s->q_scale_type) {
192         return non_linear_qscale[qscale];
193     } else {
194         return qscale << 1;
195     }
196 }
197
198 /* motion type (for MPEG-2) */
199 #define MT_FIELD 1
200 #define MT_FRAME 2
201 #define MT_16X8  2
202 #define MT_DMV   3
203
204 static int mpeg_decode_mb(MpegEncContext *s,
205                           DCTELEM block[12][64])
206 {
207     int i, j, k, cbp, val, mb_type, motion_type;
208     const int mb_block_count = 4 + (1<< s->chroma_format);
209
210     dprintf(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
211
212     assert(s->mb_skipped==0);
213
214     if (s->mb_skip_run-- != 0) {
215         if (s->pict_type == FF_P_TYPE) {
216             s->mb_skipped = 1;
217             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
218         } else {
219             int mb_type;
220
221             if(s->mb_x)
222                 mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
223             else
224                 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
225             if(IS_INTRA(mb_type))
226                 return -1;
227
228             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
229                 mb_type | MB_TYPE_SKIP;
230 //            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
231
232             if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
233                 s->mb_skipped = 1;
234         }
235
236         return 0;
237     }
238
239     switch(s->pict_type) {
240     default:
241     case FF_I_TYPE:
242         if (get_bits1(&s->gb) == 0) {
243             if (get_bits1(&s->gb) == 0){
244                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
245                 return -1;
246             }
247             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
248         } else {
249             mb_type = MB_TYPE_INTRA;
250         }
251         break;
252     case FF_P_TYPE:
253         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
254         if (mb_type < 0){
255             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
256             return -1;
257         }
258         mb_type = ptype2mb_type[ mb_type ];
259         break;
260     case FF_B_TYPE:
261         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
262         if (mb_type < 0){
263             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
264             return -1;
265         }
266         mb_type = btype2mb_type[ mb_type ];
267         break;
268     }
269     dprintf(s->avctx, "mb_type=%x\n", mb_type);
270 //    motion_type = 0; /* avoid warning */
271     if (IS_INTRA(mb_type)) {
272         s->dsp.clear_blocks(s->block[0]);
273
274         if(!s->chroma_y_shift){
275             s->dsp.clear_blocks(s->block[6]);
276         }
277
278         /* compute DCT type */
279         if (s->picture_structure == PICT_FRAME && //FIXME add an interlaced_dct coded var?
280             !s->frame_pred_frame_dct) {
281             s->interlaced_dct = get_bits1(&s->gb);
282         }
283
284         if (IS_QUANT(mb_type))
285             s->qscale = get_qscale(s);
286
287         if (s->concealment_motion_vectors) {
288             /* just parse them */
289             if (s->picture_structure != PICT_FRAME)
290                 skip_bits1(&s->gb); /* field select */
291
292             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
293                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
294             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
295                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
296
297             skip_bits1(&s->gb); /* marker */
298         }else
299             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
300         s->mb_intra = 1;
301         //if 1, we memcpy blocks in xvmcvideo
302         if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
303             ff_xvmc_pack_pblocks(s,-1);//inter are always full blocks
304             if(s->swap_uv){
305                 exchange_uv(s);
306             }
307         }
308
309         if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
310             if(s->flags2 & CODEC_FLAG2_FAST){
311                 for(i=0;i<6;i++) {
312                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
313                 }
314             }else{
315                 for(i=0;i<mb_block_count;i++) {
316                     if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
317                         return -1;
318                 }
319             }
320         } else {
321             for(i=0;i<6;i++) {
322                 if (ff_mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
323                     return -1;
324             }
325         }
326     } else {
327         if (mb_type & MB_TYPE_ZERO_MV){
328             assert(mb_type & MB_TYPE_CBP);
329
330             s->mv_dir = MV_DIR_FORWARD;
331             if(s->picture_structure == PICT_FRAME){
332                 if(!s->frame_pred_frame_dct)
333                     s->interlaced_dct = get_bits1(&s->gb);
334                 s->mv_type = MV_TYPE_16X16;
335             }else{
336                 s->mv_type = MV_TYPE_FIELD;
337                 mb_type |= MB_TYPE_INTERLACED;
338                 s->field_select[0][0]= s->picture_structure - 1;
339             }
340
341             if (IS_QUANT(mb_type))
342                 s->qscale = get_qscale(s);
343
344             s->last_mv[0][0][0] = 0;
345             s->last_mv[0][0][1] = 0;
346             s->last_mv[0][1][0] = 0;
347             s->last_mv[0][1][1] = 0;
348             s->mv[0][0][0] = 0;
349             s->mv[0][0][1] = 0;
350         }else{
351             assert(mb_type & MB_TYPE_L0L1);
352 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
353             /* get additional motion vector type */
354             if (s->frame_pred_frame_dct)
355                 motion_type = MT_FRAME;
356             else{
357                 motion_type = get_bits(&s->gb, 2);
358                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
359                     s->interlaced_dct = get_bits1(&s->gb);
360             }
361
362             if (IS_QUANT(mb_type))
363                 s->qscale = get_qscale(s);
364
365             /* motion vectors */
366             s->mv_dir= (mb_type>>13)&3;
367             dprintf(s->avctx, "motion_type=%d\n", motion_type);
368             switch(motion_type) {
369             case MT_FRAME: /* or MT_16X8 */
370                 if (s->picture_structure == PICT_FRAME) {
371                     mb_type |= MB_TYPE_16x16;
372                     s->mv_type = MV_TYPE_16X16;
373                     for(i=0;i<2;i++) {
374                         if (USES_LIST(mb_type, i)) {
375                             /* MT_FRAME */
376                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
377                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
378                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
379                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
380                             /* full_pel: only for MPEG-1 */
381                             if (s->full_pel[i]){
382                                 s->mv[i][0][0] <<= 1;
383                                 s->mv[i][0][1] <<= 1;
384                             }
385                         }
386                     }
387                 } else {
388                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
389                     s->mv_type = MV_TYPE_16X8;
390                     for(i=0;i<2;i++) {
391                         if (USES_LIST(mb_type, i)) {
392                             /* MT_16X8 */
393                             for(j=0;j<2;j++) {
394                                 s->field_select[i][j] = get_bits1(&s->gb);
395                                 for(k=0;k<2;k++) {
396                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
397                                                              s->last_mv[i][j][k]);
398                                     s->last_mv[i][j][k] = val;
399                                     s->mv[i][j][k] = val;
400                                 }
401                             }
402                         }
403                     }
404                 }
405                 break;
406             case MT_FIELD:
407                 s->mv_type = MV_TYPE_FIELD;
408                 if (s->picture_structure == PICT_FRAME) {
409                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
410                     for(i=0;i<2;i++) {
411                         if (USES_LIST(mb_type, i)) {
412                             for(j=0;j<2;j++) {
413                                 s->field_select[i][j] = get_bits1(&s->gb);
414                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
415                                                          s->last_mv[i][j][0]);
416                                 s->last_mv[i][j][0] = val;
417                                 s->mv[i][j][0] = val;
418                                 dprintf(s->avctx, "fmx=%d\n", val);
419                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
420                                                          s->last_mv[i][j][1] >> 1);
421                                 s->last_mv[i][j][1] = val << 1;
422                                 s->mv[i][j][1] = val;
423                                 dprintf(s->avctx, "fmy=%d\n", val);
424                             }
425                         }
426                     }
427                 } else {
428                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
429                     for(i=0;i<2;i++) {
430                         if (USES_LIST(mb_type, i)) {
431                             s->field_select[i][0] = get_bits1(&s->gb);
432                             for(k=0;k<2;k++) {
433                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
434                                                          s->last_mv[i][0][k]);
435                                 s->last_mv[i][0][k] = val;
436                                 s->last_mv[i][1][k] = val;
437                                 s->mv[i][0][k] = val;
438                             }
439                         }
440                     }
441                 }
442                 break;
443             case MT_DMV:
444                 s->mv_type = MV_TYPE_DMV;
445                 for(i=0;i<2;i++) {
446                     if (USES_LIST(mb_type, i)) {
447                         int dmx, dmy, mx, my, m;
448                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
449                                                 s->last_mv[i][0][0]);
450                         s->last_mv[i][0][0] = mx;
451                         s->last_mv[i][1][0] = mx;
452                         dmx = get_dmv(s);
453                         my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
454                                                 s->last_mv[i][0][1] >> 1);
455                         dmy = get_dmv(s);
456
457
458                         s->last_mv[i][0][1] = my<<1;
459                         s->last_mv[i][1][1] = my<<1;
460
461                         s->mv[i][0][0] = mx;
462                         s->mv[i][0][1] = my;
463                         s->mv[i][1][0] = mx;//not used
464                         s->mv[i][1][1] = my;//not used
465
466                         if (s->picture_structure == PICT_FRAME) {
467                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
468
469                             //m = 1 + 2 * s->top_field_first;
470                             m = s->top_field_first ? 1 : 3;
471
472                             /* top -> top pred */
473                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
474                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
475                             m = 4 - m;
476                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
477                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
478                         } else {
479                             mb_type |= MB_TYPE_16x16;
480
481                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
482                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
483                             if(s->picture_structure == PICT_TOP_FIELD)
484                                 s->mv[i][2][1]--;
485                             else
486                                 s->mv[i][2][1]++;
487                         }
488                     }
489                 }
490                 break;
491             default:
492                 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
493                 return -1;
494             }
495         }
496
497         s->mb_intra = 0;
498         if (HAS_CBP(mb_type)) {
499             s->dsp.clear_blocks(s->block[0]);
500
501             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
502             if(mb_block_count > 6){
503                  cbp<<= mb_block_count-6;
504                  cbp |= get_bits(&s->gb, mb_block_count-6);
505                  s->dsp.clear_blocks(s->block[6]);
506             }
507             if (cbp <= 0){
508                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
509                 return -1;
510             }
511
512             //if 1, we memcpy blocks in xvmcvideo
513             if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
514                 ff_xvmc_pack_pblocks(s,cbp);
515                 if(s->swap_uv){
516                     exchange_uv(s);
517                 }
518             }
519
520             if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
521                 if(s->flags2 & CODEC_FLAG2_FAST){
522                     for(i=0;i<6;i++) {
523                         if(cbp & 32) {
524                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
525                         } else {
526                             s->block_last_index[i] = -1;
527                         }
528                         cbp+=cbp;
529                     }
530                 }else{
531                     cbp<<= 12-mb_block_count;
532
533                     for(i=0;i<mb_block_count;i++) {
534                         if ( cbp & (1<<11) ) {
535                             if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
536                                 return -1;
537                         } else {
538                             s->block_last_index[i] = -1;
539                         }
540                         cbp+=cbp;
541                     }
542                 }
543             } else {
544                 if(s->flags2 & CODEC_FLAG2_FAST){
545                     for(i=0;i<6;i++) {
546                         if (cbp & 32) {
547                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
548                         } else {
549                             s->block_last_index[i] = -1;
550                         }
551                         cbp+=cbp;
552                     }
553                 }else{
554                     for(i=0;i<6;i++) {
555                         if (cbp & 32) {
556                             if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
557                                 return -1;
558                         } else {
559                             s->block_last_index[i] = -1;
560                         }
561                         cbp+=cbp;
562                     }
563                 }
564             }
565         }else{
566             for(i=0;i<12;i++)
567                 s->block_last_index[i] = -1;
568         }
569     }
570
571     s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
572
573     return 0;
574 }
575
576 /* as H.263, but only 17 codes */
577 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
578 {
579     int code, sign, val, l, shift;
580
581     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
582     if (code == 0) {
583         return pred;
584     }
585     if (code < 0) {
586         return 0xffff;
587     }
588
589     sign = get_bits1(&s->gb);
590     shift = fcode - 1;
591     val = code;
592     if (shift) {
593         val = (val - 1) << shift;
594         val |= get_bits(&s->gb, shift);
595         val++;
596     }
597     if (sign)
598         val = -val;
599     val += pred;
600
601     /* modulo decoding */
602     l= INT_BIT - 5 - shift;
603     val = (val<<l)>>l;
604     return val;
605 }
606
607 inline int ff_mpeg1_decode_block_intra(MpegEncContext *s,
608                                DCTELEM *block,
609                                int n)
610 {
611     int level, dc, diff, i, j, run;
612     int component;
613     RLTable *rl = &ff_rl_mpeg1;
614     uint8_t * const scantable= s->intra_scantable.permutated;
615     const uint16_t *quant_matrix= s->intra_matrix;
616     const int qscale= s->qscale;
617
618     /* DC coefficient */
619     component = (n <= 3 ? 0 : n - 4 + 1);
620     diff = decode_dc(&s->gb, component);
621     if (diff >= 0xffff)
622         return -1;
623     dc = s->last_dc[component];
624     dc += diff;
625     s->last_dc[component] = dc;
626     block[0] = dc*quant_matrix[0];
627     dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
628     i = 0;
629     {
630         OPEN_READER(re, &s->gb);
631         /* now quantify & encode AC coefficients */
632         for(;;) {
633             UPDATE_CACHE(re, &s->gb);
634             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
635
636             if(level == 127){
637                 break;
638             } else if(level != 0) {
639                 i += run;
640                 j = scantable[i];
641                 level= (level*qscale*quant_matrix[j])>>4;
642                 level= (level-1)|1;
643                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
644                 LAST_SKIP_BITS(re, &s->gb, 1);
645             } else {
646                 /* escape */
647                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
648                 UPDATE_CACHE(re, &s->gb);
649                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
650                 if (level == -128) {
651                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
652                 } else if (level == 0) {
653                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
654                 }
655                 i += run;
656                 j = scantable[i];
657                 if(level<0){
658                     level= -level;
659                     level= (level*qscale*quant_matrix[j])>>4;
660                     level= (level-1)|1;
661                     level= -level;
662                 }else{
663                     level= (level*qscale*quant_matrix[j])>>4;
664                     level= (level-1)|1;
665                 }
666             }
667             if (i > 63){
668                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
669                 return -1;
670             }
671
672             block[j] = level;
673         }
674         CLOSE_READER(re, &s->gb);
675     }
676     s->block_last_index[n] = i;
677    return 0;
678 }
679
680 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
681                                DCTELEM *block,
682                                int n)
683 {
684     int level, i, j, run;
685     RLTable *rl = &ff_rl_mpeg1;
686     uint8_t * const scantable= s->intra_scantable.permutated;
687     const uint16_t *quant_matrix= s->inter_matrix;
688     const int qscale= s->qscale;
689
690     {
691         OPEN_READER(re, &s->gb);
692         i = -1;
693         // special case for first coefficient, no need to add second VLC table
694         UPDATE_CACHE(re, &s->gb);
695         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
696             level= (3*qscale*quant_matrix[0])>>5;
697             level= (level-1)|1;
698             if(GET_CACHE(re, &s->gb)&0x40000000)
699                 level= -level;
700             block[0] = level;
701             i++;
702             SKIP_BITS(re, &s->gb, 2);
703             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
704                 goto end;
705         }
706 #if MIN_CACHE_BITS < 19
707         UPDATE_CACHE(re, &s->gb);
708 #endif
709         /* now quantify & encode AC coefficients */
710         for(;;) {
711             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
712
713             if(level != 0) {
714                 i += run;
715                 j = scantable[i];
716                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
717                 level= (level-1)|1;
718                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
719                 SKIP_BITS(re, &s->gb, 1);
720             } else {
721                 /* escape */
722                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
723                 UPDATE_CACHE(re, &s->gb);
724                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
725                 if (level == -128) {
726                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
727                 } else if (level == 0) {
728                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
729                 }
730                 i += run;
731                 j = scantable[i];
732                 if(level<0){
733                     level= -level;
734                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
735                     level= (level-1)|1;
736                     level= -level;
737                 }else{
738                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
739                     level= (level-1)|1;
740                 }
741             }
742             if (i > 63){
743                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
744                 return -1;
745             }
746
747             block[j] = level;
748 #if MIN_CACHE_BITS < 19
749             UPDATE_CACHE(re, &s->gb);
750 #endif
751             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
752                 break;
753 #if MIN_CACHE_BITS >= 19
754             UPDATE_CACHE(re, &s->gb);
755 #endif
756         }
757 end:
758         LAST_SKIP_BITS(re, &s->gb, 2);
759         CLOSE_READER(re, &s->gb);
760     }
761     s->block_last_index[n] = i;
762     return 0;
763 }
764
765 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
766 {
767     int level, i, j, run;
768     RLTable *rl = &ff_rl_mpeg1;
769     uint8_t * const scantable= s->intra_scantable.permutated;
770     const int qscale= s->qscale;
771
772     {
773         OPEN_READER(re, &s->gb);
774         i = -1;
775         // special case for first coefficient, no need to add second VLC table
776         UPDATE_CACHE(re, &s->gb);
777         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
778             level= (3*qscale)>>1;
779             level= (level-1)|1;
780             if(GET_CACHE(re, &s->gb)&0x40000000)
781                 level= -level;
782             block[0] = level;
783             i++;
784             SKIP_BITS(re, &s->gb, 2);
785             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
786                 goto end;
787         }
788 #if MIN_CACHE_BITS < 19
789         UPDATE_CACHE(re, &s->gb);
790 #endif
791
792         /* now quantify & encode AC coefficients */
793         for(;;) {
794             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
795
796             if(level != 0) {
797                 i += run;
798                 j = scantable[i];
799                 level= ((level*2+1)*qscale)>>1;
800                 level= (level-1)|1;
801                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
802                 SKIP_BITS(re, &s->gb, 1);
803             } else {
804                 /* escape */
805                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
806                 UPDATE_CACHE(re, &s->gb);
807                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
808                 if (level == -128) {
809                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
810                 } else if (level == 0) {
811                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
812                 }
813                 i += run;
814                 j = scantable[i];
815                 if(level<0){
816                     level= -level;
817                     level= ((level*2+1)*qscale)>>1;
818                     level= (level-1)|1;
819                     level= -level;
820                 }else{
821                     level= ((level*2+1)*qscale)>>1;
822                     level= (level-1)|1;
823                 }
824             }
825
826             block[j] = level;
827 #if MIN_CACHE_BITS < 19
828             UPDATE_CACHE(re, &s->gb);
829 #endif
830             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
831                 break;
832 #if MIN_CACHE_BITS >= 19
833             UPDATE_CACHE(re, &s->gb);
834 #endif
835         }
836 end:
837         LAST_SKIP_BITS(re, &s->gb, 2);
838         CLOSE_READER(re, &s->gb);
839     }
840     s->block_last_index[n] = i;
841     return 0;
842 }
843
844
845 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
846                                DCTELEM *block,
847                                int n)
848 {
849     int level, i, j, run;
850     RLTable *rl = &ff_rl_mpeg1;
851     uint8_t * const scantable= s->intra_scantable.permutated;
852     const uint16_t *quant_matrix;
853     const int qscale= s->qscale;
854     int mismatch;
855
856     mismatch = 1;
857
858     {
859         OPEN_READER(re, &s->gb);
860         i = -1;
861         if (n < 4)
862             quant_matrix = s->inter_matrix;
863         else
864             quant_matrix = s->chroma_inter_matrix;
865
866         // special case for first coefficient, no need to add second VLC table
867         UPDATE_CACHE(re, &s->gb);
868         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
869             level= (3*qscale*quant_matrix[0])>>5;
870             if(GET_CACHE(re, &s->gb)&0x40000000)
871                 level= -level;
872             block[0] = level;
873             mismatch ^= level;
874             i++;
875             SKIP_BITS(re, &s->gb, 2);
876             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
877                 goto end;
878         }
879 #if MIN_CACHE_BITS < 19
880         UPDATE_CACHE(re, &s->gb);
881 #endif
882
883         /* now quantify & encode AC coefficients */
884         for(;;) {
885             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
886
887             if(level != 0) {
888                 i += run;
889                 j = scantable[i];
890                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
891                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
892                 SKIP_BITS(re, &s->gb, 1);
893             } else {
894                 /* escape */
895                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
896                 UPDATE_CACHE(re, &s->gb);
897                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
898
899                 i += run;
900                 j = scantable[i];
901                 if(level<0){
902                     level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
903                     level= -level;
904                 }else{
905                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
906                 }
907             }
908             if (i > 63){
909                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
910                 return -1;
911             }
912
913             mismatch ^= level;
914             block[j] = level;
915 #if MIN_CACHE_BITS < 19
916             UPDATE_CACHE(re, &s->gb);
917 #endif
918             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
919                 break;
920 #if MIN_CACHE_BITS >= 19
921             UPDATE_CACHE(re, &s->gb);
922 #endif
923         }
924 end:
925         LAST_SKIP_BITS(re, &s->gb, 2);
926         CLOSE_READER(re, &s->gb);
927     }
928     block[63] ^= (mismatch & 1);
929
930     s->block_last_index[n] = i;
931     return 0;
932 }
933
934 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
935                                DCTELEM *block,
936                                int n)
937 {
938     int level, i, j, run;
939     RLTable *rl = &ff_rl_mpeg1;
940     uint8_t * const scantable= s->intra_scantable.permutated;
941     const int qscale= s->qscale;
942     OPEN_READER(re, &s->gb);
943     i = -1;
944
945     // special case for first coefficient, no need to add second VLC table
946     UPDATE_CACHE(re, &s->gb);
947     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
948         level= (3*qscale)>>1;
949         if(GET_CACHE(re, &s->gb)&0x40000000)
950             level= -level;
951         block[0] = level;
952         i++;
953         SKIP_BITS(re, &s->gb, 2);
954         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
955             goto end;
956     }
957 #if MIN_CACHE_BITS < 19
958     UPDATE_CACHE(re, &s->gb);
959 #endif
960
961     /* now quantify & encode AC coefficients */
962     for(;;) {
963         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
964
965         if(level != 0) {
966             i += run;
967             j = scantable[i];
968             level= ((level*2+1)*qscale)>>1;
969             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
970             SKIP_BITS(re, &s->gb, 1);
971         } else {
972             /* escape */
973             run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
974             UPDATE_CACHE(re, &s->gb);
975             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
976
977             i += run;
978             j = scantable[i];
979             if(level<0){
980                 level= ((-level*2+1)*qscale)>>1;
981                 level= -level;
982             }else{
983                 level= ((level*2+1)*qscale)>>1;
984             }
985         }
986
987         block[j] = level;
988 #if MIN_CACHE_BITS < 19
989         UPDATE_CACHE(re, &s->gb);
990 #endif
991         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
992             break;
993 #if MIN_CACHE_BITS >=19
994         UPDATE_CACHE(re, &s->gb);
995 #endif
996     }
997 end:
998     LAST_SKIP_BITS(re, &s->gb, 2);
999     CLOSE_READER(re, &s->gb);
1000     s->block_last_index[n] = i;
1001     return 0;
1002 }
1003
1004
1005 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1006                                DCTELEM *block,
1007                                int n)
1008 {
1009     int level, dc, diff, i, j, run;
1010     int component;
1011     RLTable *rl;
1012     uint8_t * const scantable= s->intra_scantable.permutated;
1013     const uint16_t *quant_matrix;
1014     const int qscale= s->qscale;
1015     int mismatch;
1016
1017     /* DC coefficient */
1018     if (n < 4){
1019         quant_matrix = s->intra_matrix;
1020         component = 0;
1021     }else{
1022         quant_matrix = s->chroma_intra_matrix;
1023         component = (n&1) + 1;
1024     }
1025     diff = decode_dc(&s->gb, component);
1026     if (diff >= 0xffff)
1027         return -1;
1028     dc = s->last_dc[component];
1029     dc += diff;
1030     s->last_dc[component] = dc;
1031     block[0] = dc << (3 - s->intra_dc_precision);
1032     dprintf(s->avctx, "dc=%d\n", block[0]);
1033     mismatch = block[0] ^ 1;
1034     i = 0;
1035     if (s->intra_vlc_format)
1036         rl = &ff_rl_mpeg2;
1037     else
1038         rl = &ff_rl_mpeg1;
1039
1040     {
1041         OPEN_READER(re, &s->gb);
1042         /* now quantify & encode AC coefficients */
1043         for(;;) {
1044             UPDATE_CACHE(re, &s->gb);
1045             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1046
1047             if(level == 127){
1048                 break;
1049             } else if(level != 0) {
1050                 i += run;
1051                 j = scantable[i];
1052                 level= (level*qscale*quant_matrix[j])>>4;
1053                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1054                 LAST_SKIP_BITS(re, &s->gb, 1);
1055             } else {
1056                 /* escape */
1057                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1058                 UPDATE_CACHE(re, &s->gb);
1059                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1060                 i += run;
1061                 j = scantable[i];
1062                 if(level<0){
1063                     level= (-level*qscale*quant_matrix[j])>>4;
1064                     level= -level;
1065                 }else{
1066                     level= (level*qscale*quant_matrix[j])>>4;
1067                 }
1068             }
1069             if (i > 63){
1070                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1071                 return -1;
1072             }
1073
1074             mismatch^= level;
1075             block[j] = level;
1076         }
1077         CLOSE_READER(re, &s->gb);
1078     }
1079     block[63]^= mismatch&1;
1080
1081     s->block_last_index[n] = i;
1082     return 0;
1083 }
1084
1085 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1086                                DCTELEM *block,
1087                                int n)
1088 {
1089     int level, dc, diff, j, run;
1090     int component;
1091     RLTable *rl;
1092     uint8_t * scantable= s->intra_scantable.permutated;
1093     const uint16_t *quant_matrix;
1094     const int qscale= s->qscale;
1095
1096     /* DC coefficient */
1097     if (n < 4){
1098         quant_matrix = s->intra_matrix;
1099         component = 0;
1100     }else{
1101         quant_matrix = s->chroma_intra_matrix;
1102         component = (n&1) + 1;
1103     }
1104     diff = decode_dc(&s->gb, component);
1105     if (diff >= 0xffff)
1106         return -1;
1107     dc = s->last_dc[component];
1108     dc += diff;
1109     s->last_dc[component] = dc;
1110     block[0] = dc << (3 - s->intra_dc_precision);
1111     if (s->intra_vlc_format)
1112         rl = &ff_rl_mpeg2;
1113     else
1114         rl = &ff_rl_mpeg1;
1115
1116     {
1117         OPEN_READER(re, &s->gb);
1118         /* now quantify & encode AC coefficients */
1119         for(;;) {
1120             UPDATE_CACHE(re, &s->gb);
1121             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1122
1123             if(level == 127){
1124                 break;
1125             } else if(level != 0) {
1126                 scantable += run;
1127                 j = *scantable;
1128                 level= (level*qscale*quant_matrix[j])>>4;
1129                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1130                 LAST_SKIP_BITS(re, &s->gb, 1);
1131             } else {
1132                 /* escape */
1133                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1134                 UPDATE_CACHE(re, &s->gb);
1135                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1136                 scantable += run;
1137                 j = *scantable;
1138                 if(level<0){
1139                     level= (-level*qscale*quant_matrix[j])>>4;
1140                     level= -level;
1141                 }else{
1142                     level= (level*qscale*quant_matrix[j])>>4;
1143                 }
1144             }
1145
1146             block[j] = level;
1147         }
1148         CLOSE_READER(re, &s->gb);
1149     }
1150
1151     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1152     return 0;
1153 }
1154
1155 typedef struct Mpeg1Context {
1156     MpegEncContext mpeg_enc_ctx;
1157     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1158     int repeat_field; /* true if we must repeat the field */
1159     AVPanScan pan_scan; /** some temporary storage for the panscan */
1160     int slice_count;
1161     int swap_uv;//indicate VCR2
1162     int save_aspect_info;
1163     int save_width, save_height;
1164     AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
1165
1166 } Mpeg1Context;
1167
1168 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1169 {
1170     Mpeg1Context *s = avctx->priv_data;
1171     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1172     int i;
1173
1174     /* we need some permutation to store matrices,
1175      * until MPV_common_init() sets the real permutation. */
1176     for(i=0;i<64;i++)
1177        s2->dsp.idct_permutation[i]=i;
1178
1179     MPV_decode_defaults(s2);
1180
1181     s->mpeg_enc_ctx.avctx= avctx;
1182     s->mpeg_enc_ctx.flags= avctx->flags;
1183     s->mpeg_enc_ctx.flags2= avctx->flags2;
1184     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1185     ff_mpeg12_init_vlcs();
1186
1187     s->mpeg_enc_ctx_allocated = 0;
1188     s->mpeg_enc_ctx.picture_number = 0;
1189     s->repeat_field = 0;
1190     s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1191     return 0;
1192 }
1193
1194 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1195                                      const uint8_t *new_perm){
1196     uint16_t temp_matrix[64];
1197     int i;
1198
1199     memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1200
1201     for(i=0;i<64;i++){
1202         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1203     }
1204 }
1205
1206 static enum PixelFormat mpeg_get_pixelformat(AVCodecContext *avctx){
1207     Mpeg1Context *s1 = avctx->priv_data;
1208     MpegEncContext *s = &s1->mpeg_enc_ctx;
1209
1210     if(avctx->xvmc_acceleration)
1211         return avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1212     else if(avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU){
1213         if(avctx->codec_id == CODEC_ID_MPEG1VIDEO)
1214             return PIX_FMT_VDPAU_MPEG1;
1215         else
1216             return PIX_FMT_VDPAU_MPEG2;
1217     }else{
1218         if(s->chroma_format <  2)
1219             return avctx->get_format(avctx,ff_hwaccel_pixfmt_list_420);
1220         else if(s->chroma_format == 2)
1221             return PIX_FMT_YUV422P;
1222         else
1223             return PIX_FMT_YUV444P;
1224     }
1225 }
1226
1227 /* Call this function when we know all parameters.
1228  * It may be called in different places for MPEG-1 and MPEG-2. */
1229 static int mpeg_decode_postinit(AVCodecContext *avctx){
1230     Mpeg1Context *s1 = avctx->priv_data;
1231     MpegEncContext *s = &s1->mpeg_enc_ctx;
1232     uint8_t old_permutation[64];
1233
1234     if (
1235         (s1->mpeg_enc_ctx_allocated == 0)||
1236         avctx->coded_width  != s->width ||
1237         avctx->coded_height != s->height||
1238         s1->save_width != s->width ||
1239         s1->save_height != s->height ||
1240         s1->save_aspect_info != s->aspect_ratio_info||
1241         0)
1242     {
1243
1244         if (s1->mpeg_enc_ctx_allocated) {
1245             ParseContext pc= s->parse_context;
1246             s->parse_context.buffer=0;
1247             MPV_common_end(s);
1248             s->parse_context= pc;
1249         }
1250
1251         if( (s->width == 0 )||(s->height == 0))
1252             return -2;
1253
1254         avcodec_set_dimensions(avctx, s->width, s->height);
1255         avctx->bit_rate = s->bit_rate;
1256         s1->save_aspect_info = s->aspect_ratio_info;
1257         s1->save_width = s->width;
1258         s1->save_height = s->height;
1259
1260         /* low_delay may be forced, in this case we will have B-frames
1261          * that behave like P-frames. */
1262         avctx->has_b_frames = !(s->low_delay);
1263
1264         assert((avctx->sub_id==1) == (avctx->codec_id==CODEC_ID_MPEG1VIDEO));
1265         if(avctx->codec_id==CODEC_ID_MPEG1VIDEO){
1266             //MPEG-1 fps
1267             avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1268             avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1269             //MPEG-1 aspect
1270             avctx->sample_aspect_ratio= av_d2q(
1271                     1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1272             avctx->ticks_per_frame=1;
1273         }else{//MPEG-2
1274         //MPEG-2 fps
1275             av_reduce(
1276                 &s->avctx->time_base.den,
1277                 &s->avctx->time_base.num,
1278                 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1279                 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1280                 1<<30);
1281             avctx->ticks_per_frame=2;
1282         //MPEG-2 aspect
1283             if(s->aspect_ratio_info > 1){
1284                 //we ignore the spec here as reality does not match the spec, see for example
1285                 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1286                 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) || 1){
1287                     s->avctx->sample_aspect_ratio=
1288                         av_div_q(
1289                          ff_mpeg2_aspect[s->aspect_ratio_info],
1290                          (AVRational){s->width, s->height}
1291                          );
1292                 }else{
1293                     s->avctx->sample_aspect_ratio=
1294                         av_div_q(
1295                          ff_mpeg2_aspect[s->aspect_ratio_info],
1296                          (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1297                         );
1298                 }
1299             }else{
1300                 s->avctx->sample_aspect_ratio=
1301                     ff_mpeg2_aspect[s->aspect_ratio_info];
1302             }
1303         }//MPEG-2
1304
1305         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1306         avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1307         //until then pix_fmt may be changed right after codec init
1308         if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
1309             avctx->hwaccel ||
1310             s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
1311             if( avctx->idct_algo == FF_IDCT_AUTO )
1312                 avctx->idct_algo = FF_IDCT_SIMPLE;
1313
1314         /* Quantization matrices may need reordering
1315          * if DCT permutation is changed. */
1316         memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1317
1318         if (MPV_common_init(s) < 0)
1319             return -2;
1320
1321         quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
1322         quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
1323         quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1324         quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1325
1326         s1->mpeg_enc_ctx_allocated = 1;
1327     }
1328     return 0;
1329 }
1330
1331 static int mpeg1_decode_picture(AVCodecContext *avctx,
1332                                 const uint8_t *buf, int buf_size)
1333 {
1334     Mpeg1Context *s1 = avctx->priv_data;
1335     MpegEncContext *s = &s1->mpeg_enc_ctx;
1336     int ref, f_code, vbv_delay;
1337
1338     if(mpeg_decode_postinit(s->avctx) < 0)
1339        return -2;
1340
1341     init_get_bits(&s->gb, buf, buf_size*8);
1342
1343     ref = get_bits(&s->gb, 10); /* temporal ref */
1344     s->pict_type = get_bits(&s->gb, 3);
1345     if(s->pict_type == 0 || s->pict_type > 3)
1346         return -1;
1347
1348     vbv_delay= get_bits(&s->gb, 16);
1349     if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
1350         s->full_pel[0] = get_bits1(&s->gb);
1351         f_code = get_bits(&s->gb, 3);
1352         if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1353             return -1;
1354         s->mpeg_f_code[0][0] = f_code;
1355         s->mpeg_f_code[0][1] = f_code;
1356     }
1357     if (s->pict_type == FF_B_TYPE) {
1358         s->full_pel[1] = get_bits1(&s->gb);
1359         f_code = get_bits(&s->gb, 3);
1360         if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1361             return -1;
1362         s->mpeg_f_code[1][0] = f_code;
1363         s->mpeg_f_code[1][1] = f_code;
1364     }
1365     s->current_picture.pict_type= s->pict_type;
1366     s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1367
1368     if(avctx->debug & FF_DEBUG_PICT_INFO)
1369         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1370
1371     s->y_dc_scale = 8;
1372     s->c_dc_scale = 8;
1373     s->first_slice = 1;
1374     return 0;
1375 }
1376
1377 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1378 {
1379     MpegEncContext *s= &s1->mpeg_enc_ctx;
1380     int horiz_size_ext, vert_size_ext;
1381     int bit_rate_ext;
1382
1383     skip_bits(&s->gb, 1); /* profile and level esc*/
1384     s->avctx->profile= get_bits(&s->gb, 3);
1385     s->avctx->level= get_bits(&s->gb, 4);
1386     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1387     s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1388     horiz_size_ext = get_bits(&s->gb, 2);
1389     vert_size_ext = get_bits(&s->gb, 2);
1390     s->width |= (horiz_size_ext << 12);
1391     s->height |= (vert_size_ext << 12);
1392     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1393     s->bit_rate += (bit_rate_ext << 18) * 400;
1394     skip_bits1(&s->gb); /* marker */
1395     s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1396
1397     s->low_delay = get_bits1(&s->gb);
1398     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1399
1400     s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1401     s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1402
1403     dprintf(s->avctx, "sequence extension\n");
1404     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1405     s->avctx->sub_id = 2; /* indicates MPEG-2 found */
1406
1407     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1408         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1409                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1410
1411 }
1412
1413 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1414 {
1415     MpegEncContext *s= &s1->mpeg_enc_ctx;
1416     int color_description, w, h;
1417
1418     skip_bits(&s->gb, 3); /* video format */
1419     color_description= get_bits1(&s->gb);
1420     if(color_description){
1421         skip_bits(&s->gb, 8); /* color primaries */
1422         skip_bits(&s->gb, 8); /* transfer_characteristics */
1423         skip_bits(&s->gb, 8); /* matrix_coefficients */
1424     }
1425     w= get_bits(&s->gb, 14);
1426     skip_bits(&s->gb, 1); //marker
1427     h= get_bits(&s->gb, 14);
1428     skip_bits(&s->gb, 1); //marker
1429
1430     s1->pan_scan.width= 16*w;
1431     s1->pan_scan.height=16*h;
1432
1433     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1434         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1435 }
1436
1437 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1438 {
1439     MpegEncContext *s= &s1->mpeg_enc_ctx;
1440     int i,nofco;
1441
1442     nofco = 1;
1443     if(s->progressive_sequence){
1444         if(s->repeat_first_field){
1445             nofco++;
1446             if(s->top_field_first)
1447                 nofco++;
1448         }
1449     }else{
1450         if(s->picture_structure == PICT_FRAME){
1451             nofco++;
1452             if(s->repeat_first_field)
1453                 nofco++;
1454         }
1455     }
1456     for(i=0; i<nofco; i++){
1457         s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1458         skip_bits(&s->gb, 1); //marker
1459         s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1460         skip_bits(&s->gb, 1); //marker
1461     }
1462
1463     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1464         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1465             s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1466             s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1467             s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1468         );
1469 }
1470
1471 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1472 {
1473     int i, v, j;
1474
1475     dprintf(s->avctx, "matrix extension\n");
1476
1477     if (get_bits1(&s->gb)) {
1478         for(i=0;i<64;i++) {
1479             v = get_bits(&s->gb, 8);
1480             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1481             s->intra_matrix[j] = v;
1482             s->chroma_intra_matrix[j] = v;
1483         }
1484     }
1485     if (get_bits1(&s->gb)) {
1486         for(i=0;i<64;i++) {
1487             v = get_bits(&s->gb, 8);
1488             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1489             s->inter_matrix[j] = v;
1490             s->chroma_inter_matrix[j] = v;
1491         }
1492     }
1493     if (get_bits1(&s->gb)) {
1494         for(i=0;i<64;i++) {
1495             v = get_bits(&s->gb, 8);
1496             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1497             s->chroma_intra_matrix[j] = v;
1498         }
1499     }
1500     if (get_bits1(&s->gb)) {
1501         for(i=0;i<64;i++) {
1502             v = get_bits(&s->gb, 8);
1503             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1504             s->chroma_inter_matrix[j] = v;
1505         }
1506     }
1507 }
1508
1509 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1510 {
1511     MpegEncContext *s= &s1->mpeg_enc_ctx;
1512
1513     s->full_pel[0] = s->full_pel[1] = 0;
1514     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1515     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1516     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1517     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1518     if(!s->pict_type && s1->mpeg_enc_ctx_allocated){
1519         av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1520         if(s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1]==15){
1521             if(s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1522                 s->pict_type= FF_I_TYPE;
1523             else
1524                 s->pict_type= FF_P_TYPE;
1525         }else
1526             s->pict_type= FF_B_TYPE;
1527         s->current_picture.pict_type= s->pict_type;
1528         s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1529         s->first_slice= 1;
1530     }
1531     s->intra_dc_precision = get_bits(&s->gb, 2);
1532     s->picture_structure = get_bits(&s->gb, 2);
1533     s->top_field_first = get_bits1(&s->gb);
1534     s->frame_pred_frame_dct = get_bits1(&s->gb);
1535     s->concealment_motion_vectors = get_bits1(&s->gb);
1536     s->q_scale_type = get_bits1(&s->gb);
1537     s->intra_vlc_format = get_bits1(&s->gb);
1538     s->alternate_scan = get_bits1(&s->gb);
1539     s->repeat_first_field = get_bits1(&s->gb);
1540     s->chroma_420_type = get_bits1(&s->gb);
1541     s->progressive_frame = get_bits1(&s->gb);
1542
1543     if(s->picture_structure == PICT_FRAME){
1544         s->first_field=0;
1545         s->v_edge_pos= 16*s->mb_height;
1546     }else{
1547         s->first_field ^= 1;
1548         s->v_edge_pos=  8*s->mb_height;
1549         memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1550     }
1551
1552     if(s->alternate_scan){
1553         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
1554         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
1555     }else{
1556         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
1557         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
1558     }
1559
1560     /* composite display not parsed */
1561     dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1562     dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1563     dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1564     dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1565     dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1566     dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1567     dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1568     dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1569     dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1570 }
1571
1572 static void mpeg_decode_extension(AVCodecContext *avctx,
1573                                   const uint8_t *buf, int buf_size)
1574 {
1575     Mpeg1Context *s1 = avctx->priv_data;
1576     MpegEncContext *s = &s1->mpeg_enc_ctx;
1577     int ext_type;
1578
1579     init_get_bits(&s->gb, buf, buf_size*8);
1580
1581     ext_type = get_bits(&s->gb, 4);
1582     switch(ext_type) {
1583     case 0x1:
1584         mpeg_decode_sequence_extension(s1);
1585         break;
1586     case 0x2:
1587         mpeg_decode_sequence_display_extension(s1);
1588         break;
1589     case 0x3:
1590         mpeg_decode_quant_matrix_extension(s);
1591         break;
1592     case 0x7:
1593         mpeg_decode_picture_display_extension(s1);
1594         break;
1595     case 0x8:
1596         mpeg_decode_picture_coding_extension(s1);
1597         break;
1598     }
1599 }
1600
1601 static void exchange_uv(MpegEncContext *s){
1602     DCTELEM (*tmp)[64];
1603
1604     tmp           = s->pblocks[4];
1605     s->pblocks[4] = s->pblocks[5];
1606     s->pblocks[5] = tmp;
1607 }
1608
1609 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size){
1610     AVCodecContext *avctx= s->avctx;
1611     Mpeg1Context *s1 = (Mpeg1Context*)s;
1612
1613     /* start frame decoding */
1614     if(s->first_field || s->picture_structure==PICT_FRAME){
1615         if(MPV_frame_start(s, avctx) < 0)
1616             return -1;
1617
1618         ff_er_frame_start(s);
1619
1620         /* first check if we must repeat the frame */
1621         s->current_picture_ptr->repeat_pict = 0;
1622         if (s->repeat_first_field) {
1623             if (s->progressive_sequence) {
1624                 if (s->top_field_first)
1625                     s->current_picture_ptr->repeat_pict = 4;
1626                 else
1627                     s->current_picture_ptr->repeat_pict = 2;
1628             } else if (s->progressive_frame) {
1629                 s->current_picture_ptr->repeat_pict = 1;
1630             }
1631         }
1632
1633         *s->current_picture_ptr->pan_scan= s1->pan_scan;
1634     }else{ //second field
1635             int i;
1636
1637             if(!s->current_picture_ptr){
1638                 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1639                 return -1;
1640             }
1641
1642             for(i=0; i<4; i++){
1643                 s->current_picture.data[i] = s->current_picture_ptr->data[i];
1644                 if(s->picture_structure == PICT_BOTTOM_FIELD){
1645                     s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1646                 }
1647             }
1648     }
1649
1650     if (avctx->hwaccel) {
1651         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1652             return -1;
1653     }
1654
1655 // MPV_frame_start will call this function too,
1656 // but we need to call it on every field
1657     if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1658         if(ff_xvmc_field_start(s,avctx) < 0)
1659             return -1;
1660
1661     return 0;
1662 }
1663
1664 #define DECODE_SLICE_ERROR -1
1665 #define DECODE_SLICE_OK 0
1666
1667 /**
1668  * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1669  * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1670  *         DECODE_SLICE_OK if this slice is ok<br>
1671  */
1672 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1673                              const uint8_t **buf, int buf_size)
1674 {
1675     MpegEncContext *s = &s1->mpeg_enc_ctx;
1676     AVCodecContext *avctx= s->avctx;
1677     const int field_pic= s->picture_structure != PICT_FRAME;
1678     const int lowres= s->avctx->lowres;
1679
1680     s->resync_mb_x=
1681     s->resync_mb_y= -1;
1682
1683     if (mb_y<<field_pic >= s->mb_height){
1684         av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
1685         return -1;
1686     }
1687
1688     init_get_bits(&s->gb, *buf, buf_size*8);
1689
1690     ff_mpeg1_clean_buffers(s);
1691     s->interlaced_dct = 0;
1692
1693     s->qscale = get_qscale(s);
1694
1695     if(s->qscale == 0){
1696         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1697         return -1;
1698     }
1699
1700     /* extra slice info */
1701     while (get_bits1(&s->gb) != 0) {
1702         skip_bits(&s->gb, 8);
1703     }
1704
1705     s->mb_x=0;
1706
1707     if (avctx->hwaccel) {
1708         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1709         int start_code = -1;
1710         buf_end = ff_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1711         if (buf_end < *buf + buf_size)
1712             buf_end -= 4;
1713         s->mb_y = mb_y;
1714         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1715             return DECODE_SLICE_ERROR;
1716         *buf = buf_end;
1717         return DECODE_SLICE_OK;
1718     }
1719
1720     for(;;) {
1721         int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1722         if (code < 0){
1723             av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1724             return -1;
1725         }
1726         if (code >= 33) {
1727             if (code == 33) {
1728                 s->mb_x += 33;
1729             }
1730             /* otherwise, stuffing, nothing to do */
1731         } else {
1732             s->mb_x += code;
1733             break;
1734         }
1735     }
1736     if(s->mb_x >= (unsigned)s->mb_width){
1737         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1738         return -1;
1739     }
1740
1741     s->resync_mb_x= s->mb_x;
1742     s->resync_mb_y= s->mb_y= mb_y;
1743     s->mb_skip_run= 0;
1744     ff_init_block_index(s);
1745
1746     if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1747         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1748              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",
1749                  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],
1750                  s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")),
1751                  s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1752                  s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1753                  s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1754         }
1755     }
1756
1757     for(;;) {
1758         //If 1, we memcpy blocks in xvmcvideo.
1759         if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1760             ff_xvmc_init_block(s);//set s->block
1761
1762         if(mpeg_decode_mb(s, s->block) < 0)
1763             return -1;
1764
1765         if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1766             const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
1767             int xy = s->mb_x*2 + s->mb_y*2*wrap;
1768             int motion_x, motion_y, dir, i;
1769             if(field_pic && !s->first_field)
1770                 xy += wrap/2;
1771
1772             for(i=0; i<2; i++){
1773                 for(dir=0; dir<2; dir++){
1774                     if (s->mb_intra || (dir==1 && s->pict_type != FF_B_TYPE)) {
1775                         motion_x = motion_y = 0;
1776                     }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1777                         motion_x = s->mv[dir][0][0];
1778                         motion_y = s->mv[dir][0][1];
1779                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1780                         motion_x = s->mv[dir][i][0];
1781                         motion_y = s->mv[dir][i][1];
1782                     }
1783
1784                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1785                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1786                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1787                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1788                     s->current_picture.ref_index [dir][xy    ]=
1789                     s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
1790                     assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1791                 }
1792                 xy += wrap;
1793             }
1794         }
1795
1796         s->dest[0] += 16 >> lowres;
1797         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1798         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1799
1800         MPV_decode_mb(s, s->block);
1801
1802         if (++s->mb_x >= s->mb_width) {
1803             const int mb_size= 16>>s->avctx->lowres;
1804
1805             ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
1806
1807             s->mb_x = 0;
1808             s->mb_y++;
1809
1810             if(s->mb_y<<field_pic >= s->mb_height){
1811                 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
1812                 int is_d10= s->chroma_format==2 && s->pict_type==FF_I_TYPE && avctx->profile==0 && avctx->level==5
1813                             && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1814                             && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1815
1816                 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1817                    || (avctx->error_recognition >= FF_ER_AGGRESSIVE && left>8)){
1818                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1819                     return -1;
1820                 }else
1821                     goto eos;
1822             }
1823
1824             ff_init_block_index(s);
1825         }
1826
1827         /* skip mb handling */
1828         if (s->mb_skip_run == -1) {
1829             /* read increment again */
1830             s->mb_skip_run = 0;
1831             for(;;) {
1832                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1833                 if (code < 0){
1834                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1835                     return -1;
1836                 }
1837                 if (code >= 33) {
1838                     if (code == 33) {
1839                         s->mb_skip_run += 33;
1840                     }else if(code == 35){
1841                         if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1842                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1843                             return -1;
1844                         }
1845                         goto eos; /* end of slice */
1846                     }
1847                     /* otherwise, stuffing, nothing to do */
1848                 } else {
1849                     s->mb_skip_run += code;
1850                     break;
1851                 }
1852             }
1853             if(s->mb_skip_run){
1854                 int i;
1855                 if(s->pict_type == FF_I_TYPE){
1856                     av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1857                     return -1;
1858                 }
1859
1860                 /* skip mb */
1861                 s->mb_intra = 0;
1862                 for(i=0;i<12;i++)
1863                     s->block_last_index[i] = -1;
1864                 if(s->picture_structure == PICT_FRAME)
1865                     s->mv_type = MV_TYPE_16X16;
1866                 else
1867                     s->mv_type = MV_TYPE_FIELD;
1868                 if (s->pict_type == FF_P_TYPE) {
1869                     /* if P type, zero motion vector is implied */
1870                     s->mv_dir = MV_DIR_FORWARD;
1871                     s->mv[0][0][0] = s->mv[0][0][1] = 0;
1872                     s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1873                     s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1874                     s->field_select[0][0]= s->picture_structure - 1;
1875                 } else {
1876                     /* if B type, reuse previous vectors and directions */
1877                     s->mv[0][0][0] = s->last_mv[0][0][0];
1878                     s->mv[0][0][1] = s->last_mv[0][0][1];
1879                     s->mv[1][0][0] = s->last_mv[1][0][0];
1880                     s->mv[1][0][1] = s->last_mv[1][0][1];
1881                 }
1882             }
1883         }
1884     }
1885 eos: // end of slice
1886     *buf += (get_bits_count(&s->gb)-1)/8;
1887 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1888     return 0;
1889 }
1890
1891 static int slice_decode_thread(AVCodecContext *c, void *arg){
1892     MpegEncContext *s= *(void**)arg;
1893     const uint8_t *buf= s->gb.buffer;
1894     int mb_y= s->start_mb_y;
1895
1896     s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
1897
1898     for(;;){
1899         uint32_t start_code;
1900         int ret;
1901
1902         ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1903         emms_c();
1904 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1905 //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);
1906         if(ret < 0){
1907             if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1908                 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);
1909         }else{
1910             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);
1911         }
1912
1913         if(s->mb_y == s->end_mb_y)
1914             return 0;
1915
1916         start_code= -1;
1917         buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1918         mb_y= start_code - SLICE_MIN_START_CODE;
1919         if(mb_y < 0 || mb_y >= s->end_mb_y)
1920             return -1;
1921     }
1922
1923     return 0; //not reached
1924 }
1925
1926 /**
1927  * Handles slice ends.
1928  * @return 1 if it seems to be the last slice
1929  */
1930 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1931 {
1932     Mpeg1Context *s1 = avctx->priv_data;
1933     MpegEncContext *s = &s1->mpeg_enc_ctx;
1934
1935     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1936         return 0;
1937
1938     if (s->avctx->hwaccel) {
1939         if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1940             av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1941     }
1942
1943     if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1944         ff_xvmc_field_end(s);
1945
1946     /* end of slice reached */
1947     if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1948         /* end of image */
1949
1950         s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1951
1952         ff_er_frame_end(s);
1953
1954         MPV_frame_end(s);
1955
1956         if (s->pict_type == FF_B_TYPE || s->low_delay) {
1957             *pict= *(AVFrame*)s->current_picture_ptr;
1958             ff_print_debug_info(s, pict);
1959         } else {
1960             s->picture_number++;
1961             /* latency of 1 frame for I- and P-frames */
1962             /* XXX: use another variable than picture_number */
1963             if (s->last_picture_ptr != NULL) {
1964                 *pict= *(AVFrame*)s->last_picture_ptr;
1965                  ff_print_debug_info(s, pict);
1966             }
1967         }
1968
1969         return 1;
1970     } else {
1971         return 0;
1972     }
1973 }
1974
1975 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1976                                  const uint8_t *buf, int buf_size)
1977 {
1978     Mpeg1Context *s1 = avctx->priv_data;
1979     MpegEncContext *s = &s1->mpeg_enc_ctx;
1980     int width,height;
1981     int i, v, j;
1982
1983     init_get_bits(&s->gb, buf, buf_size*8);
1984
1985     width = get_bits(&s->gb, 12);
1986     height = get_bits(&s->gb, 12);
1987     if (width <= 0 || height <= 0)
1988         return -1;
1989     s->aspect_ratio_info= get_bits(&s->gb, 4);
1990     if (s->aspect_ratio_info == 0) {
1991         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1992         if (avctx->error_recognition >= FF_ER_COMPLIANT)
1993             return -1;
1994     }
1995     s->frame_rate_index = get_bits(&s->gb, 4);
1996     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1997         return -1;
1998     s->bit_rate = get_bits(&s->gb, 18) * 400;
1999     if (get_bits1(&s->gb) == 0) /* marker */
2000         return -1;
2001     s->width = width;
2002     s->height = height;
2003
2004     s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2005     skip_bits(&s->gb, 1);
2006
2007     /* get matrix */
2008     if (get_bits1(&s->gb)) {
2009         for(i=0;i<64;i++) {
2010             v = get_bits(&s->gb, 8);
2011             if(v==0){
2012                 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
2013                 return -1;
2014             }
2015             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2016             s->intra_matrix[j] = v;
2017             s->chroma_intra_matrix[j] = v;
2018         }
2019 #ifdef DEBUG
2020         dprintf(s->avctx, "intra matrix present\n");
2021         for(i=0;i<64;i++)
2022             dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
2023         dprintf(s->avctx, "\n");
2024 #endif
2025     } else {
2026         for(i=0;i<64;i++) {
2027             j = s->dsp.idct_permutation[i];
2028             v = ff_mpeg1_default_intra_matrix[i];
2029             s->intra_matrix[j] = v;
2030             s->chroma_intra_matrix[j] = v;
2031         }
2032     }
2033     if (get_bits1(&s->gb)) {
2034         for(i=0;i<64;i++) {
2035             v = get_bits(&s->gb, 8);
2036             if(v==0){
2037                 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2038                 return -1;
2039             }
2040             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2041             s->inter_matrix[j] = v;
2042             s->chroma_inter_matrix[j] = v;
2043         }
2044 #ifdef DEBUG
2045         dprintf(s->avctx, "non-intra matrix present\n");
2046         for(i=0;i<64;i++)
2047             dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2048         dprintf(s->avctx, "\n");
2049 #endif
2050     } else {
2051         for(i=0;i<64;i++) {
2052             int j= s->dsp.idct_permutation[i];
2053             v = ff_mpeg1_default_non_intra_matrix[i];
2054             s->inter_matrix[j] = v;
2055             s->chroma_inter_matrix[j] = v;
2056         }
2057     }
2058
2059     if(show_bits(&s->gb, 23) != 0){
2060         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2061         return -1;
2062     }
2063
2064     /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2065     s->progressive_sequence = 1;
2066     s->progressive_frame = 1;
2067     s->picture_structure = PICT_FRAME;
2068     s->frame_pred_frame_dct = 1;
2069     s->chroma_format = 1;
2070     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2071     avctx->sub_id = 1; /* indicates MPEG-1 */
2072     s->out_format = FMT_MPEG1;
2073     s->swap_uv = 0;//AFAIK VCR2 does not have SEQ_HEADER
2074     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2075
2076     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2077         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2078                s->avctx->rc_buffer_size, s->bit_rate);
2079
2080     return 0;
2081 }
2082
2083 static int vcr2_init_sequence(AVCodecContext *avctx)
2084 {
2085     Mpeg1Context *s1 = avctx->priv_data;
2086     MpegEncContext *s = &s1->mpeg_enc_ctx;
2087     int i, v;
2088
2089     /* start new MPEG-1 context decoding */
2090     s->out_format = FMT_MPEG1;
2091     if (s1->mpeg_enc_ctx_allocated) {
2092         MPV_common_end(s);
2093     }
2094     s->width  = avctx->coded_width;
2095     s->height = avctx->coded_height;
2096     avctx->has_b_frames= 0; //true?
2097     s->low_delay= 1;
2098
2099     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2100     avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2101
2102     if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel ||
2103         s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
2104         if( avctx->idct_algo == FF_IDCT_AUTO )
2105             avctx->idct_algo = FF_IDCT_SIMPLE;
2106
2107     if (MPV_common_init(s) < 0)
2108         return -1;
2109     exchange_uv(s);//common init reset pblocks, so we swap them here
2110     s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2111     s1->mpeg_enc_ctx_allocated = 1;
2112
2113     for(i=0;i<64;i++) {
2114         int j= s->dsp.idct_permutation[i];
2115         v = ff_mpeg1_default_intra_matrix[i];
2116         s->intra_matrix[j] = v;
2117         s->chroma_intra_matrix[j] = v;
2118
2119         v = ff_mpeg1_default_non_intra_matrix[i];
2120         s->inter_matrix[j] = v;
2121         s->chroma_inter_matrix[j] = v;
2122     }
2123
2124     s->progressive_sequence = 1;
2125     s->progressive_frame = 1;
2126     s->picture_structure = PICT_FRAME;
2127     s->frame_pred_frame_dct = 1;
2128     s->chroma_format = 1;
2129     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2130     avctx->sub_id = 2; /* indicates MPEG-2 */
2131     return 0;
2132 }
2133
2134
2135 static void mpeg_decode_user_data(AVCodecContext *avctx,
2136                                   const uint8_t *buf, int buf_size)
2137 {
2138     const uint8_t *p;
2139     int len, flags;
2140     p = buf;
2141     len = buf_size;
2142
2143     /* we parse the DTG active format information */
2144     if (len >= 5 &&
2145         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2146         flags = p[4];
2147         p += 5;
2148         len -= 5;
2149         if (flags & 0x80) {
2150             /* skip event id */
2151             if (len < 2)
2152                 return;
2153             p += 2;
2154             len -= 2;
2155         }
2156         if (flags & 0x40) {
2157             if (len < 1)
2158                 return;
2159             avctx->dtg_active_format = p[0] & 0x0f;
2160         }
2161     }
2162 }
2163
2164 static void mpeg_decode_gop(AVCodecContext *avctx,
2165                             const uint8_t *buf, int buf_size){
2166     Mpeg1Context *s1 = avctx->priv_data;
2167     MpegEncContext *s = &s1->mpeg_enc_ctx;
2168
2169     int drop_frame_flag;
2170     int time_code_hours, time_code_minutes;
2171     int time_code_seconds, time_code_pictures;
2172     int closed_gop, broken_link;
2173
2174     init_get_bits(&s->gb, buf, buf_size*8);
2175
2176     drop_frame_flag = get_bits1(&s->gb);
2177
2178     time_code_hours=get_bits(&s->gb,5);
2179     time_code_minutes = get_bits(&s->gb,6);
2180     skip_bits1(&s->gb);//marker bit
2181     time_code_seconds = get_bits(&s->gb,6);
2182     time_code_pictures = get_bits(&s->gb,6);
2183
2184     closed_gop  = get_bits1(&s->gb);
2185     /*broken_link indicate that after editing the
2186       reference frames of the first B-Frames after GOP I-Frame
2187       are missing (open gop)*/
2188     broken_link = get_bits1(&s->gb);
2189
2190     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2191         av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2192             time_code_hours, time_code_minutes, time_code_seconds,
2193             time_code_pictures, closed_gop, broken_link);
2194 }
2195 /**
2196  * Finds the end of the current frame in the bitstream.
2197  * @return the position of the first byte of the next frame, or -1
2198  */
2199 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2200 {
2201     int i;
2202     uint32_t state= pc->state;
2203
2204     /* EOF considered as end of frame */
2205     if (buf_size == 0)
2206         return 0;
2207
2208 /*
2209  0  frame start         -> 1/4
2210  1  first_SEQEXT        -> 0/2
2211  2  first field start   -> 3/0
2212  3  second_SEQEXT       -> 2/0
2213  4  searching end
2214 */
2215
2216     for(i=0; i<buf_size; i++){
2217         assert(pc->frame_start_found>=0 && pc->frame_start_found<=4);
2218         if(pc->frame_start_found&1){
2219             if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80)
2220                 pc->frame_start_found--;
2221             else if(state == EXT_START_CODE+2){
2222                 if((buf[i]&3) == 3) pc->frame_start_found= 0;
2223                 else                pc->frame_start_found= (pc->frame_start_found+1)&3;
2224             }
2225             state++;
2226         }else{
2227             i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2228             if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2229                 i++;
2230                 pc->frame_start_found=4;
2231             }
2232             if(state == SEQ_END_CODE){
2233                 pc->state=-1;
2234                 return i+1;
2235             }
2236             if(pc->frame_start_found==2 && state == SEQ_START_CODE)
2237                 pc->frame_start_found= 0;
2238             if(pc->frame_start_found<4 && state == EXT_START_CODE)
2239                 pc->frame_start_found++;
2240             if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){
2241                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2242                     pc->frame_start_found=0;
2243                     pc->state=-1;
2244                     return i-3;
2245                 }
2246             }
2247             if(s && state == PICTURE_START_CODE){
2248                 ff_fetch_timestamp(s, i-4, 1);
2249             }
2250         }
2251     }
2252     pc->state= state;
2253     return END_NOT_FOUND;
2254 }
2255
2256 static int decode_chunks(AVCodecContext *avctx,
2257                              AVFrame *picture, int *data_size,
2258                              const uint8_t *buf, int buf_size);
2259
2260 /* handle buffering and image synchronisation */
2261 static int mpeg_decode_frame(AVCodecContext *avctx,
2262                              void *data, int *data_size,
2263                              const uint8_t *buf, int buf_size)
2264 {
2265     Mpeg1Context *s = avctx->priv_data;
2266     AVFrame *picture = data;
2267     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2268     dprintf(avctx, "fill_buffer\n");
2269
2270     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2271         /* special case for last picture */
2272         if (s2->low_delay==0 && s2->next_picture_ptr) {
2273             *picture= *(AVFrame*)s2->next_picture_ptr;
2274             s2->next_picture_ptr= NULL;
2275
2276             *data_size = sizeof(AVFrame);
2277         }
2278         return buf_size;
2279     }
2280
2281     if(s2->flags&CODEC_FLAG_TRUNCATED){
2282         int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2283
2284         if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2285             return buf_size;
2286     }
2287
2288 #if 0
2289     if (s->repeat_field % 2 == 1) {
2290         s->repeat_field++;
2291         //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2292         //        s2->picture_number, s->repeat_field);
2293         if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2294             *data_size = sizeof(AVPicture);
2295             goto the_end;
2296         }
2297     }
2298 #endif
2299
2300     if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == AV_RL32("VCR2"))
2301         vcr2_init_sequence(avctx);
2302
2303     s->slice_count= 0;
2304
2305     if(avctx->extradata && !avctx->frame_number)
2306         decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2307
2308     return decode_chunks(avctx, picture, data_size, buf, buf_size);
2309 }
2310
2311 static int decode_chunks(AVCodecContext *avctx,
2312                              AVFrame *picture, int *data_size,
2313                              const uint8_t *buf, int buf_size)
2314 {
2315     Mpeg1Context *s = avctx->priv_data;
2316     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2317     const uint8_t *buf_ptr = buf;
2318     const uint8_t *buf_end = buf + buf_size;
2319     int ret, input_size;
2320
2321     for(;;) {
2322         /* find next start code */
2323         uint32_t start_code = -1;
2324         buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2325         if (start_code > 0x1ff){
2326             if(s2->pict_type != FF_B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2327                 if(avctx->thread_count > 1){
2328                     int i;
2329
2330                     avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count, sizeof(void*));
2331                     for(i=0; i<s->slice_count; i++)
2332                         s2->error_count += s2->thread_context[i]->error_count;
2333                 }
2334
2335                 if (CONFIG_MPEG_VDPAU_DECODER && avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)
2336                     ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2337
2338                 if (slice_end(avctx, picture)) {
2339                     if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2340                         *data_size = sizeof(AVPicture);
2341                 }
2342             }
2343             s2->pict_type= 0;
2344             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2345         }
2346
2347         input_size = buf_end - buf_ptr;
2348
2349         if(avctx->debug & FF_DEBUG_STARTCODE){
2350             av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2351         }
2352
2353         /* prepare data for next start code */
2354         switch(start_code) {
2355         case SEQ_START_CODE:
2356             mpeg1_decode_sequence(avctx, buf_ptr,
2357                                     input_size);
2358             break;
2359
2360         case PICTURE_START_CODE:
2361             /* we have a complete image: we try to decompress it */
2362             if(mpeg1_decode_picture(avctx,
2363                                     buf_ptr, input_size) < 0)
2364                 s2->pict_type=0;
2365             break;
2366         case EXT_START_CODE:
2367             mpeg_decode_extension(avctx,
2368                                     buf_ptr, input_size);
2369             break;
2370         case USER_START_CODE:
2371             mpeg_decode_user_data(avctx,
2372                                     buf_ptr, input_size);
2373             break;
2374         case GOP_START_CODE:
2375             s2->first_field=0;
2376             mpeg_decode_gop(avctx,
2377                                     buf_ptr, input_size);
2378             break;
2379         default:
2380             if (start_code >= SLICE_MIN_START_CODE &&
2381                 start_code <= SLICE_MAX_START_CODE) {
2382                 int mb_y= start_code - SLICE_MIN_START_CODE;
2383
2384                 if(s2->last_picture_ptr==NULL){
2385                 /* Skip B-frames if we do not have reference frames. */
2386                     if(s2->pict_type==FF_B_TYPE) break;
2387                 }
2388                 if(s2->next_picture_ptr==NULL){
2389                 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2390                     if(s2->pict_type==FF_P_TYPE && (s2->first_field || s2->picture_structure==PICT_FRAME)) break;
2391                 }
2392                 /* Skip B-frames if we are in a hurry. */
2393                 if(avctx->hurry_up && s2->pict_type==FF_B_TYPE) break;
2394                 if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==FF_B_TYPE)
2395                     ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=FF_I_TYPE)
2396                     || avctx->skip_frame >= AVDISCARD_ALL)
2397                     break;
2398                 /* Skip everything if we are in a hurry>=5. */
2399                 if(avctx->hurry_up>=5) break;
2400
2401                 if (!s->mpeg_enc_ctx_allocated) break;
2402
2403                 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2404                     if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2405                         break;
2406                 }
2407
2408                 if(!s2->pict_type){
2409                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2410                     break;
2411                 }
2412
2413                 if(s2->first_slice){
2414                     s2->first_slice=0;
2415                     if(mpeg_field_start(s2, buf, buf_size) < 0)
2416                         return -1;
2417                 }
2418                 if(!s2->current_picture_ptr){
2419                     av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2420                     return -1;
2421                 }
2422
2423                 if (avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU) {
2424                     s->slice_count++;
2425                     break;
2426                 }
2427
2428                 if(avctx->thread_count > 1){
2429                     int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2430                     if(threshold <= mb_y){
2431                         MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2432
2433                         thread_context->start_mb_y= mb_y;
2434                         thread_context->end_mb_y  = s2->mb_height;
2435                         if(s->slice_count){
2436                             s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2437                             ff_update_duplicate_context(thread_context, s2);
2438                         }
2439                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2440                         s->slice_count++;
2441                     }
2442                     buf_ptr += 2; //FIXME add minimum number of bytes per slice
2443                 }else{
2444                     ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2445                     emms_c();
2446
2447                     if(ret < 0){
2448                         if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2449                             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);
2450                     }else{
2451                         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);
2452                     }
2453                 }
2454             }
2455             break;
2456         }
2457     }
2458 }
2459
2460 static int mpeg_decode_end(AVCodecContext *avctx)
2461 {
2462     Mpeg1Context *s = avctx->priv_data;
2463
2464     if (s->mpeg_enc_ctx_allocated)
2465         MPV_common_end(&s->mpeg_enc_ctx);
2466     return 0;
2467 }
2468
2469 AVCodec mpeg1video_decoder = {
2470     "mpeg1video",
2471     CODEC_TYPE_VIDEO,
2472     CODEC_ID_MPEG1VIDEO,
2473     sizeof(Mpeg1Context),
2474     mpeg_decode_init,
2475     NULL,
2476     mpeg_decode_end,
2477     mpeg_decode_frame,
2478     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2479     .flush= ff_mpeg_flush,
2480     .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2481 };
2482
2483 AVCodec mpeg2video_decoder = {
2484     "mpeg2video",
2485     CODEC_TYPE_VIDEO,
2486     CODEC_ID_MPEG2VIDEO,
2487     sizeof(Mpeg1Context),
2488     mpeg_decode_init,
2489     NULL,
2490     mpeg_decode_end,
2491     mpeg_decode_frame,
2492     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2493     .flush= ff_mpeg_flush,
2494     .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2495 };
2496
2497 //legacy decoder
2498 AVCodec mpegvideo_decoder = {
2499     "mpegvideo",
2500     CODEC_TYPE_VIDEO,
2501     CODEC_ID_MPEG2VIDEO,
2502     sizeof(Mpeg1Context),
2503     mpeg_decode_init,
2504     NULL,
2505     mpeg_decode_end,
2506     mpeg_decode_frame,
2507     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2508     .flush= ff_mpeg_flush,
2509     .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2510 };
2511
2512 #if CONFIG_MPEG_XVMC_DECODER
2513 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx){
2514     if( avctx->thread_count > 1)
2515         return -1;
2516     if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2517         return -1;
2518     if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2519         dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2520     }
2521     mpeg_decode_init(avctx);
2522
2523     avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2524     avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2525
2526     return 0;
2527 }
2528
2529 AVCodec mpeg_xvmc_decoder = {
2530     "mpegvideo_xvmc",
2531     CODEC_TYPE_VIDEO,
2532     CODEC_ID_MPEG2VIDEO_XVMC,
2533     sizeof(Mpeg1Context),
2534     mpeg_mc_decode_init,
2535     NULL,
2536     mpeg_decode_end,
2537     mpeg_decode_frame,
2538     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2539     .flush= ff_mpeg_flush,
2540     .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2541 };
2542
2543 #endif
2544
2545 #if CONFIG_MPEG_VDPAU_DECODER
2546 AVCodec mpeg_vdpau_decoder = {
2547     "mpegvideo_vdpau",
2548     CODEC_TYPE_VIDEO,
2549     CODEC_ID_MPEG2VIDEO,
2550     sizeof(Mpeg1Context),
2551     mpeg_decode_init,
2552     NULL,
2553     mpeg_decode_end,
2554     mpeg_decode_frame,
2555     CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2556     .flush= ff_mpeg_flush,
2557     .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2558 };
2559 #endif
2560
2561 #if CONFIG_MPEG1_VDPAU_DECODER
2562 AVCodec mpeg1_vdpau_decoder = {
2563     "mpeg1video_vdpau",
2564     CODEC_TYPE_VIDEO,
2565     CODEC_ID_MPEG1VIDEO,
2566     sizeof(Mpeg1Context),
2567     mpeg_decode_init,
2568     NULL,
2569     mpeg_decode_end,
2570     mpeg_decode_frame,
2571     CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2572     .flush= ff_mpeg_flush,
2573     .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2574 };
2575 #endif
2576