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ffmpeg / libavcodec / h263dec.c @ 5fe061a0

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1
/*
2
 * H263 decoder
3
 * Copyright (c) 2001 Fabrice Bellard.
4
 *
5
 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
7
 * License as published by the Free Software Foundation; either
8
 * version 2 of the License, or (at your option) any later version.
9
 *
10
 * This library is distributed in the hope that it will be useful,
11
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
14
 *
15
 * You should have received a copy of the GNU Lesser General Public
16
 * License along with this library; if not, write to the Free Software
17
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18
 */
19
#include "avcodec.h"
20
#include "dsputil.h"
21
#include "mpegvideo.h"
22

    
23
#if 1
24
#define PRINT_QP(a, b) {}
25
#else
26
#define PRINT_QP(a, b) printf(a, b)
27
#endif
28

    
29
//#define DEBUG
30
//#define PRINT_FRAME_TIME
31
#ifdef PRINT_FRAME_TIME
32
static inline long long rdtsc()
33
{
34
        long long l;
35
        asm volatile(        "rdtsc\n\t"
36
                : "=A" (l)
37
        );
38
//        printf("%d\n", int(l/1000));
39
        return l;
40
}
41
#endif
42

    
43
int ff_h263_decode_init(AVCodecContext *avctx)
44
{
45
    MpegEncContext *s = avctx->priv_data;
46

    
47
    s->avctx = avctx;
48
    s->out_format = FMT_H263;
49

    
50
    s->width = avctx->width;
51
    s->height = avctx->height;
52
    s->workaround_bugs= avctx->workaround_bugs;
53

    
54
    // set defaults
55
    s->quant_precision=5;
56
    s->progressive_sequence=1;
57
    s->decode_mb= ff_h263_decode_mb;
58
    s->low_delay= 1;
59
    avctx->pix_fmt= PIX_FMT_YUV420P;
60

    
61
    /* select sub codec */
62
    switch(avctx->codec->id) {
63
    case CODEC_ID_H263:
64
        s->gob_number = 0;
65
        break;
66
    case CODEC_ID_MPEG4:
67
        s->time_increment_bits = 4; /* default value for broken headers */
68
        s->h263_pred = 1;
69
        s->low_delay = 0; //default, might be overriden in the vol header during header parsing
70
        break;
71
    case CODEC_ID_MSMPEG4V1:
72
        s->h263_msmpeg4 = 1;
73
        s->h263_pred = 1;
74
        s->msmpeg4_version=1;
75
        break;
76
    case CODEC_ID_MSMPEG4V2:
77
        s->h263_msmpeg4 = 1;
78
        s->h263_pred = 1;
79
        s->msmpeg4_version=2;
80
        break;
81
    case CODEC_ID_MSMPEG4V3:
82
        s->h263_msmpeg4 = 1;
83
        s->h263_pred = 1;
84
        s->msmpeg4_version=3;
85
        break;
86
    case CODEC_ID_WMV1:
87
        s->h263_msmpeg4 = 1;
88
        s->h263_pred = 1;
89
        s->msmpeg4_version=4;
90
        break;
91
    case CODEC_ID_WMV2:
92
        s->h263_msmpeg4 = 1;
93
        s->h263_pred = 1;
94
        s->msmpeg4_version=5;
95
        break;
96
    case CODEC_ID_H263I:
97
        s->h263_intel = 1;
98
        break;
99
    default:
100
        return -1;
101
    }
102
    s->codec_id= avctx->codec->id;
103

    
104
    /* for h263, we allocate the images after having read the header */
105
    if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
106
        if (MPV_common_init(s) < 0)
107
            return -1;
108

    
109
    if (s->h263_msmpeg4)
110
        ff_msmpeg4_decode_init(s);
111
    else
112
        h263_decode_init_vlc(s);
113
    
114
    return 0;
115
}
116

    
117
int ff_h263_decode_end(AVCodecContext *avctx)
118
{
119
    MpegEncContext *s = avctx->priv_data;
120

    
121
    MPV_common_end(s);
122
    return 0;
123
}
124

    
125
/**
126
 * retunrs the number of bytes consumed for building the current frame
127
 */
128
static int get_consumed_bytes(MpegEncContext *s, int buf_size){
129
    int pos= (get_bits_count(&s->gb)+7)>>3;
130
    
131
    if(s->divx_version>=500){
132
        //we would have to scan through the whole buf to handle the weird reordering ...
133
        return buf_size; 
134
    }else if(s->flags&CODEC_FLAG_TRUNCATED){
135
        pos -= s->parse_context.last_index;
136
        if(pos<0) pos=0; // padding is not really read so this might be -1
137
        return pos;
138
    }else{
139
        if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
140
        if(pos+10>buf_size) pos=buf_size; // oops ;)
141

    
142
        return pos;
143
    }
144
}
145

    
146
static int decode_slice(MpegEncContext *s){
147
    s->last_resync_gb= s->gb;
148
    s->first_slice_line= 1;
149
        
150
    s->resync_mb_x= s->mb_x;
151
    s->resync_mb_y= s->mb_y;
152

    
153
    s->y_dc_scale= s->y_dc_scale_table[ s->qscale ];
154
    s->c_dc_scale= s->c_dc_scale_table[ s->qscale ];
155
    
156
    if(s->partitioned_frame){
157
        const int qscale= s->qscale;
158

    
159
        if(s->codec_id==CODEC_ID_MPEG4){
160
            if(ff_mpeg4_decode_partitions(s) < 0)
161
                return -1; 
162
        }
163
        
164
        /* restore variables which where modified */
165
        s->first_slice_line=1;
166
        s->mb_x= s->resync_mb_x;
167
        s->mb_y= s->resync_mb_y;
168
        s->qscale= qscale;
169
        s->y_dc_scale= s->y_dc_scale_table[ s->qscale ];
170
        s->c_dc_scale= s->c_dc_scale_table[ s->qscale ];
171
    }
172

    
173
    for(; s->mb_y < s->mb_height; s->mb_y++) {
174
        /* per-row end of slice checks */
175
        if(s->msmpeg4_version){
176
            if(s->resync_mb_y + s->slice_height == s->mb_y){
177
                const int xy= s->mb_x + s->mb_y*s->mb_width;
178
                s->error_status_table[xy-1]|= AC_END|DC_END|MV_END;
179
                return 0;
180
            }
181
        }
182
        
183
        if(s->msmpeg4_version==1){
184
            s->last_dc[0]=
185
            s->last_dc[1]=
186
            s->last_dc[2]= 128;
187
        }
188
    
189
        ff_init_block_index(s);
190
        for(; s->mb_x < s->mb_width; s->mb_x++) {
191
            int ret;
192

    
193
            ff_update_block_index(s);
194

    
195
            if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
196
                s->first_slice_line=0; 
197
            }
198

    
199
            /* DCT & quantize */
200
            s->dsp.clear_blocks(s->block[0]);
201
            
202
            s->mv_dir = MV_DIR_FORWARD;
203
            s->mv_type = MV_TYPE_16X16;
204
//            s->mb_skiped = 0;
205
//printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
206
            ret= s->decode_mb(s, s->block);
207
            
208
            PRINT_QP("%2d", s->qscale);
209
            MPV_decode_mb(s, s->block);
210

    
211
            if(ret<0){
212
                const int xy= s->mb_x + s->mb_y*s->mb_width;
213
                if(ret==SLICE_END){
214
//printf("%d %d %d %06X\n", s->mb_x, s->mb_y, s->gb.size*8 - get_bits_count(&s->gb), show_bits(&s->gb, 24));
215
                    s->error_status_table[xy]|= AC_END;
216
                    if(!s->partitioned_frame)
217
                        s->error_status_table[xy]|= MV_END|DC_END;
218

    
219
                    s->padding_bug_score--;
220
                        
221
                    if(++s->mb_x >= s->mb_width){
222
                        s->mb_x=0;
223
                        ff_draw_horiz_band(s);
224
                        s->mb_y++;
225
                    }
226
                    return 0; 
227
                }else if(ret==SLICE_NOEND){
228
                    fprintf(stderr,"Slice mismatch at MB: %d\n", xy);
229
                    return -1;
230
                }
231
                fprintf(stderr,"Error at MB: %d\n", xy);
232
                s->error_status_table[xy]|= AC_ERROR;
233
                if(!s->partitioned_frame)
234
                    s->error_status_table[xy]|= DC_ERROR|MV_ERROR;
235
    
236
                return -1;
237
            }
238
        }
239
        
240
        ff_draw_horiz_band(s);
241
        
242
        PRINT_QP("%s", "\n");
243
        
244
        s->mb_x= 0;
245
    }
246
    
247
    assert(s->mb_x==0 && s->mb_y==s->mb_height);
248

    
249
    /* try to detect the padding bug */
250
    if(      s->codec_id==CODEC_ID_MPEG4
251
       &&   (s->workaround_bugs&FF_BUG_AUTODETECT) 
252
       &&    s->gb.size*8 - get_bits_count(&s->gb) >=0
253
       &&    s->gb.size*8 - get_bits_count(&s->gb) < 48
254
//       &&   !s->resync_marker
255
       &&   !s->data_partitioning){
256
        
257
        const int bits_count= get_bits_count(&s->gb);
258
        const int bits_left = s->gb.size*8 - bits_count;
259
        
260
        if(bits_left==0 || bits_left>8){
261
            s->padding_bug_score++;
262
        } else if(bits_left != 1){
263
            int v= show_bits(&s->gb, 8);
264
            v|= 0x7F >> (7-(bits_count&7));
265

    
266
            if(v==0x7F)
267
                s->padding_bug_score--;
268
            else
269
                s->padding_bug_score++;            
270
        }
271
        
272
        if(s->padding_bug_score > -2)
273
            s->workaround_bugs |=  FF_BUG_NO_PADDING;
274
        else
275
            s->workaround_bugs &= ~FF_BUG_NO_PADDING;
276
    }
277

    
278
    // handle formats which dont have unique end markers
279
    if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
280
        int left= s->gb.size*8 - get_bits_count(&s->gb);
281
        int max_extra=7;
282
        
283
        /* no markers in M$ crap */
284
        if(s->msmpeg4_version && s->pict_type==I_TYPE)
285
            max_extra+= 17;
286
        
287
        /* buggy padding but the frame should still end approximately at the bitstream end */
288
        if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_resilience>=3)
289
            max_extra+= 48;
290
        else if((s->workaround_bugs&FF_BUG_NO_PADDING))
291
            max_extra+= 256*256*256*64;
292
        
293
        if(left>max_extra){
294
            fprintf(stderr, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
295
        }
296
        else if(left<0){
297
            fprintf(stderr, "overreading %d bits\n", -left);
298
        }else
299
            s->error_status_table[s->mb_num-1]|= AC_END|MV_END|DC_END;
300
        
301
        return 0;
302
    }
303

    
304
    fprintf(stderr, "slice end not reached but screenspace end (%d left %06X)\n", 
305
            s->gb.size*8 - get_bits_count(&s->gb),
306
            show_bits(&s->gb, 24));
307
    return -1;
308
}
309

    
310
/**
311
 * finds the end of the current frame in the bitstream.
312
 * @return the position of the first byte of the next frame, or -1
313
 */
314
static int mpeg4_find_frame_end(MpegEncContext *s, UINT8 *buf, int buf_size){
315
    ParseContext *pc= &s->parse_context;
316
    int vop_found, i;
317
    uint32_t state;
318
    
319
    vop_found= pc->frame_start_found;
320
    state= pc->state;
321
    
322
    i=0;
323
    if(!vop_found){
324
        for(i=0; i<buf_size; i++){
325
            state= (state<<8) | buf[i];
326
            if(state == 0x1B6){
327
                i++;
328
                vop_found=1;
329
                break;
330
            }
331
        }
332
    }
333
    
334
    for(; i<buf_size; i++){
335
        state= (state<<8) | buf[i];
336
        if((state&0xFFFFFF00) == 0x100){
337
            pc->frame_start_found=0;
338
            pc->state=-1; 
339
            return i-3;
340
        }
341
    }
342
    pc->frame_start_found= vop_found;
343
    pc->state= state;
344
    return -1;
345
}
346

    
347
int ff_h263_decode_frame(AVCodecContext *avctx, 
348
                             void *data, int *data_size,
349
                             UINT8 *buf, int buf_size)
350
{
351
    MpegEncContext *s = avctx->priv_data;
352
    int ret,i;
353
    AVFrame *pict = data; 
354
    float new_aspect;
355
    
356
#ifdef PRINT_FRAME_TIME
357
uint64_t time= rdtsc();
358
#endif
359
#ifdef DEBUG
360
    printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
361
    printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
362
#endif
363
    s->flags= avctx->flags;
364

    
365
    *data_size = 0;
366
   
367
   /* no supplementary picture */
368
    if (buf_size == 0) {
369
        return 0;
370
    }
371
    
372
    if(s->flags&CODEC_FLAG_TRUNCATED){
373
        int next;
374
        ParseContext *pc= &s->parse_context;
375
        
376
        pc->last_index= pc->index;
377

    
378
        if(s->codec_id==CODEC_ID_MPEG4){
379
            next= mpeg4_find_frame_end(s, buf, buf_size);
380
        }else{
381
            fprintf(stderr, "this codec doesnt support truncated bitstreams\n");
382
            return -1;
383
        }
384
        if(next==-1){
385
            if(buf_size + FF_INPUT_BUFFER_PADDING_SIZE + pc->index > pc->buffer_size){
386
                pc->buffer_size= buf_size + pc->index + 10*1024;
387
                pc->buffer= realloc(pc->buffer, pc->buffer_size);
388
            }
389

    
390
            memcpy(&pc->buffer[pc->index], buf, buf_size);
391
            pc->index += buf_size;
392
            return buf_size;
393
        }
394

    
395
        if(pc->index){
396
            if(next + FF_INPUT_BUFFER_PADDING_SIZE + pc->index > pc->buffer_size){
397
                pc->buffer_size= next + pc->index + 10*1024;
398
                pc->buffer= realloc(pc->buffer, pc->buffer_size);
399
            }
400

    
401
            memcpy(&pc->buffer[pc->index], buf, next + FF_INPUT_BUFFER_PADDING_SIZE );
402
            pc->index = 0;
403
            buf= pc->buffer;
404
            buf_size= pc->last_index + next;
405
        }
406
    }
407

    
408
retry:
409
    
410
    if(s->bitstream_buffer_size && buf_size<20){ //divx 5.01+ frame reorder
411
        init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size);
412
    }else
413
        init_get_bits(&s->gb, buf, buf_size);
414
    s->bitstream_buffer_size=0;
415

    
416
    if (!s->context_initialized) {
417
        if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
418
            return -1;
419
    }
420
      
421
    /* let's go :-) */
422
    if (s->msmpeg4_version==5) {
423
        ret= ff_wmv2_decode_picture_header(s);
424
    } else if (s->msmpeg4_version) {
425
        ret = msmpeg4_decode_picture_header(s);
426
    } else if (s->h263_pred) {
427
        if(s->avctx->extradata_size && s->picture_number==0){
428
            GetBitContext gb;
429
            
430
            init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size);
431
            ret = ff_mpeg4_decode_picture_header(s, &gb);
432
        }
433
        ret = ff_mpeg4_decode_picture_header(s, &s->gb);
434

    
435
        if(s->flags& CODEC_FLAG_LOW_DELAY)
436
            s->low_delay=1;
437
    } else if (s->h263_intel) {
438
        ret = intel_h263_decode_picture_header(s);
439
    } else {
440
        ret = h263_decode_picture_header(s);
441
    }
442
    avctx->has_b_frames= !s->low_delay;
443

    
444
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
445
        if(s->avctx->fourcc == ff_get_fourcc("XVIX")) 
446
            s->workaround_bugs|= FF_BUG_XVID_ILACE;
447
#if 0
448
        if(s->avctx->fourcc == ff_get_fourcc("MP4S")) 
449
            s->workaround_bugs|= FF_BUG_AC_VLC;
450
        
451
        if(s->avctx->fourcc == ff_get_fourcc("M4S2")) 
452
            s->workaround_bugs|= FF_BUG_AC_VLC;
453
#endif
454
        if(s->avctx->fourcc == ff_get_fourcc("UMP4")){
455
            s->workaround_bugs|= FF_BUG_UMP4;
456
            s->workaround_bugs|= FF_BUG_AC_VLC;
457
        }
458

    
459
        if(s->divx_version){
460
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
461
        }
462

    
463
        if(s->avctx->fourcc == ff_get_fourcc("XVID") && s->xvid_build==0)
464
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
465
        
466
        if(s->avctx->fourcc == ff_get_fourcc("XVID") && s->xvid_build==0)
467
            s->padding_bug_score= 256*256*256*64;
468
        
469
        if(s->xvid_build && s->xvid_build<=3)
470
            s->padding_bug_score= 256*256*256*64;
471
        
472
        if(s->xvid_build && s->xvid_build<=1)
473
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
474

    
475
//printf("padding_bug_score: %d\n", s->padding_bug_score);
476
#if 0
477
        if(s->divx_version==500)
478
            s->workaround_bugs|= FF_BUG_NO_PADDING;
479

480
        /* very ugly XVID padding bug detection FIXME/XXX solve this differently
481
         * lets hope this at least works
482
         */
483
        if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
484
           && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
485
            s->workaround_bugs|= FF_BUG_NO_PADDING;
486
        
487
        if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
488
            s->workaround_bugs|= FF_BUG_NO_PADDING;
489
#endif
490
    }
491
    
492

    
493
#if 0 // dump bits per frame / qp / complexity
494
{
495
    static FILE *f=NULL;
496
    if(!f) f=fopen("rate_qp_cplx.txt", "w");
497
    fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
498
}
499
#endif
500
       
501
        /* After H263 & mpeg4 header decode we have the height, width,*/
502
        /* and other parameters. So then we could init the picture   */
503
        /* FIXME: By the way H263 decoder is evolving it should have */
504
        /* an H263EncContext                                         */
505
    if(s->aspected_height)
506
        new_aspect= s->aspected_width*s->width / (float)(s->height*s->aspected_height);
507
    else
508
        new_aspect=0;
509
    
510
    if (   s->width != avctx->width || s->height != avctx->height 
511
        || ABS(new_aspect - avctx->aspect_ratio) > 0.001) {
512
        /* H.263 could change picture size any time */
513
        MPV_common_end(s);
514
        s->context_initialized=0;
515
    }
516
    if (!s->context_initialized) {
517
        avctx->width = s->width;
518
        avctx->height = s->height;
519
        avctx->aspect_ratio= new_aspect;
520

    
521
        goto retry;
522
    }
523

    
524
    if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
525
        s->gob_index = ff_h263_get_gob_height(s);
526

    
527
    if(ret==FRAME_SKIPED) return get_consumed_bytes(s, buf_size);
528
    /* skip if the header was thrashed */
529
    if (ret < 0){
530
        fprintf(stderr, "header damaged\n");
531
        return -1;
532
    }
533
    
534
    // for hurry_up==5
535
    s->current_picture.pict_type= s->pict_type;
536
    s->current_picture.key_frame= s->pict_type == I_TYPE;
537

    
538
    /* skip b frames if we dont have reference frames */
539
    if(s->last_picture.data[0]==NULL && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
540
    /* skip b frames if we are in a hurry */
541
    if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
542
    /* skip everything if we are in a hurry>=5 */
543
    if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
544
    
545
    if(s->next_p_frame_damaged){
546
        if(s->pict_type==B_TYPE)
547
            return get_consumed_bytes(s, buf_size);
548
        else
549
            s->next_p_frame_damaged=0;
550
    }
551

    
552
    if(MPV_frame_start(s, avctx) < 0)
553
        return -1;
554

    
555
#ifdef DEBUG
556
    printf("qscale=%d\n", s->qscale);
557
#endif
558

    
559
    if(s->error_resilience)
560
        memset(s->error_status_table, MV_ERROR|AC_ERROR|DC_ERROR|VP_START|AC_END|DC_END|MV_END, s->mb_num*sizeof(UINT8));
561
    
562
    /* decode each macroblock */
563
    s->block_wrap[0]=
564
    s->block_wrap[1]=
565
    s->block_wrap[2]=
566
    s->block_wrap[3]= s->mb_width*2 + 2;
567
    s->block_wrap[4]=
568
    s->block_wrap[5]= s->mb_width + 2;
569
    s->mb_x=0; 
570
    s->mb_y=0;
571
    
572
    decode_slice(s);
573
    s->error_status_table[0]|= VP_START;
574
    while(s->mb_y<s->mb_height && s->gb.size*8 - get_bits_count(&s->gb)>16){
575
        if(s->msmpeg4_version){
576
            if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0)
577
                break;
578
        }else{
579
            if(ff_h263_resync(s)<0)
580
                break;
581
        }
582
        
583
        if(s->msmpeg4_version!=4 && s->h263_pred)
584
            ff_mpeg4_clean_buffers(s);
585

    
586
        decode_slice(s);
587

    
588
        s->error_status_table[s->resync_mb_x + s->resync_mb_y*s->mb_width]|= VP_START;
589
    }
590

    
591
    if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
592
        if(msmpeg4_decode_ext_header(s, buf_size) < 0){
593
            s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
594
        }
595
    
596
    /* divx 5.01+ bistream reorder stuff */
597
    if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_version>=500){
598
        int current_pos= get_bits_count(&s->gb)>>3;
599

    
600
        if(   buf_size - current_pos > 5 
601
           && buf_size - current_pos < BITSTREAM_BUFFER_SIZE){
602
            int i;
603
            int startcode_found=0;
604
            for(i=current_pos; i<buf_size-3; i++){
605
                if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
606
                    startcode_found=1;
607
                    break;
608
                }
609
            }
610
            if(startcode_found){
611
                memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
612
                s->bitstream_buffer_size= buf_size - current_pos;
613
            }
614
        }
615
    }
616

    
617
    if(s->error_resilience){
618
        int error=0, num_end_markers=0;
619
        for(i=0; i<s->mb_num; i++){
620
            int status= s->error_status_table[i];
621
#if 0
622
            if(i%s->mb_width == 0) printf("\n");
623
            printf("%2X ", status); 
624
#endif
625
            if(status==0) continue;
626

    
627
            if(status&(DC_ERROR|AC_ERROR|MV_ERROR))
628
                error=1;
629
            if(status&VP_START){
630
                if(num_end_markers) 
631
                    error=1;
632
                num_end_markers=3;
633
            }
634
            if(status&AC_END)
635
                num_end_markers--;
636
            if(status&DC_END)
637
                num_end_markers--;
638
            if(status&MV_END)
639
                num_end_markers--;
640
        }
641
        if(num_end_markers || error){
642
            fprintf(stderr, "concealing errors\n");
643
            ff_error_resilience(s);
644
        }
645
    }
646

    
647
    MPV_frame_end(s);
648
#if 0 //dirty show MVs, we should export the MV tables and write a filter to show them
649
{
650
  int mb_y;
651
  s->has_b_frames=1;
652
  for(mb_y=0; mb_y<s->mb_height; mb_y++){
653
    int mb_x;
654
    int y= mb_y*16 + 8;
655
    for(mb_x=0; mb_x<s->mb_width; mb_x++){
656
      int x= mb_x*16 + 8;
657
      uint8_t *ptr= s->last_picture.data[0];
658
      int xy= 1 + mb_x*2 + (mb_y*2 + 1)*(s->mb_width*2 + 2);
659
      int mx= (s->motion_val[xy][0]>>1) + x;
660
      int my= (s->motion_val[xy][1]>>1) + y;
661
      int i;
662
      int max;
663

664
      if(mx<0) mx=0;
665
      if(my<0) my=0;
666
      if(mx>=s->width)  mx= s->width -1;
667
      if(my>=s->height) my= s->height-1;
668
      max= ABS(mx-x);
669
      if(ABS(my-y) > max) max= ABS(my-y);
670
      /* the ugliest linedrawing routine ... */
671
      for(i=0; i<max; i++){
672
        int x1= x + (mx-x)*i/max;
673
        int y1= y + (my-y)*i/max;
674
        ptr[y1*s->linesize + x1]+=100;
675
      }
676
      ptr[y*s->linesize + x]+=100;
677
      s->mbskip_table[mb_x + mb_y*s->mb_width]=0;
678
    }
679
  }
680

681
}
682
#endif
683

    
684
    if(s->pict_type==B_TYPE || s->low_delay){
685
        *pict= *(AVFrame*)&s->current_picture;
686
    } else {
687
        *pict= *(AVFrame*)&s->last_picture;
688
    }
689

    
690
    if(avctx->debug&FF_DEBUG_QP){
691
        int8_t *qtab= pict->qscale_table;
692
        int x,y;
693
        
694
        for(y=0; y<s->mb_height; y++){
695
            for(x=0; x<s->mb_width; x++){
696
                printf("%2d ", qtab[x + y*s->mb_width]);
697
            }
698
            printf("\n");
699
        }
700
        printf("\n");
701
    }
702

    
703
    /* Return the Picture timestamp as the frame number */
704
    /* we substract 1 because it is added on utils.c    */
705
    avctx->frame_number = s->picture_number - 1;
706

    
707
    /* dont output the last pic after seeking */
708
    if(s->last_picture.data[0] || s->low_delay)
709
        *data_size = sizeof(AVFrame);
710
#ifdef PRINT_FRAME_TIME
711
printf("%Ld\n", rdtsc()-time);
712
#endif
713
    return get_consumed_bytes(s, buf_size);
714
}
715

    
716
AVCodec mpeg4_decoder = {
717
    "mpeg4",
718
    CODEC_TYPE_VIDEO,
719
    CODEC_ID_MPEG4,
720
    sizeof(MpegEncContext),
721
    ff_h263_decode_init,
722
    NULL,
723
    ff_h263_decode_end,
724
    ff_h263_decode_frame,
725
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
726
};
727

    
728
AVCodec h263_decoder = {
729
    "h263",
730
    CODEC_TYPE_VIDEO,
731
    CODEC_ID_H263,
732
    sizeof(MpegEncContext),
733
    ff_h263_decode_init,
734
    NULL,
735
    ff_h263_decode_end,
736
    ff_h263_decode_frame,
737
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
738
};
739

    
740
AVCodec msmpeg4v1_decoder = {
741
    "msmpeg4v1",
742
    CODEC_TYPE_VIDEO,
743
    CODEC_ID_MSMPEG4V1,
744
    sizeof(MpegEncContext),
745
    ff_h263_decode_init,
746
    NULL,
747
    ff_h263_decode_end,
748
    ff_h263_decode_frame,
749
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
750
};
751

    
752
AVCodec msmpeg4v2_decoder = {
753
    "msmpeg4v2",
754
    CODEC_TYPE_VIDEO,
755
    CODEC_ID_MSMPEG4V2,
756
    sizeof(MpegEncContext),
757
    ff_h263_decode_init,
758
    NULL,
759
    ff_h263_decode_end,
760
    ff_h263_decode_frame,
761
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
762
};
763

    
764
AVCodec msmpeg4v3_decoder = {
765
    "msmpeg4",
766
    CODEC_TYPE_VIDEO,
767
    CODEC_ID_MSMPEG4V3,
768
    sizeof(MpegEncContext),
769
    ff_h263_decode_init,
770
    NULL,
771
    ff_h263_decode_end,
772
    ff_h263_decode_frame,
773
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
774
};
775

    
776
AVCodec wmv1_decoder = {
777
    "wmv1",
778
    CODEC_TYPE_VIDEO,
779
    CODEC_ID_WMV1,
780
    sizeof(MpegEncContext),
781
    ff_h263_decode_init,
782
    NULL,
783
    ff_h263_decode_end,
784
    ff_h263_decode_frame,
785
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
786
};
787

    
788
AVCodec h263i_decoder = {
789
    "h263i",
790
    CODEC_TYPE_VIDEO,
791
    CODEC_ID_H263I,
792
    sizeof(MpegEncContext),
793
    ff_h263_decode_init,
794
    NULL,
795
    ff_h263_decode_end,
796
    ff_h263_decode_frame,
797
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
798
};
799