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ffmpeg / libavcodec / h263dec.c @ e40f5d3c

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1
/*
2
 * H.263 decoder
3
 * Copyright (c) 2001 Fabrice Bellard.
4
 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5
 *
6
 * This library is free software; you can redistribute it and/or
7
 * modify it under the terms of the GNU Lesser General Public
8
 * License as published by the Free Software Foundation; either
9
 * version 2 of the License, or (at your option) any later version.
10
 *
11
 * This library is distributed in the hope that it will be useful,
12
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14
 * Lesser General Public License for more details.
15
 *
16
 * You should have received a copy of the GNU Lesser General Public
17
 * License along with this library; if not, write to the Free Software
18
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19
 */
20
 
21
/**
22
 * @file h263dec.c
23
 * H.263 decoder.
24
 */
25
 
26
#include "avcodec.h"
27
#include "dsputil.h"
28
#include "mpegvideo.h"
29

    
30
//#define DEBUG
31
//#define PRINT_FRAME_TIME
32

    
33
int ff_h263_decode_init(AVCodecContext *avctx)
34
{
35
    MpegEncContext *s = avctx->priv_data;
36

    
37
    s->avctx = avctx;
38
    s->out_format = FMT_H263;
39

    
40
    s->width = avctx->width;
41
    s->height = avctx->height;
42
    s->workaround_bugs= avctx->workaround_bugs;
43

    
44
    // set defaults
45
    s->quant_precision=5;
46
    s->progressive_sequence=1;
47
    s->decode_mb= ff_h263_decode_mb;
48
    s->low_delay= 1;
49
    avctx->pix_fmt= PIX_FMT_YUV420P;
50
    s->unrestricted_mv= 1;
51

    
52
    /* select sub codec */
53
    switch(avctx->codec->id) {
54
    case CODEC_ID_H263:
55
        s->unrestricted_mv= 0;
56
        break;
57
    case CODEC_ID_MPEG4:
58
        s->decode_mb= ff_mpeg4_decode_mb;
59
        s->time_increment_bits = 4; /* default value for broken headers */
60
        s->h263_pred = 1;
61
        s->low_delay = 0; //default, might be overriden in the vol header during header parsing
62
        break;
63
    case CODEC_ID_MSMPEG4V1:
64
        s->h263_msmpeg4 = 1;
65
        s->h263_pred = 1;
66
        s->msmpeg4_version=1;
67
        break;
68
    case CODEC_ID_MSMPEG4V2:
69
        s->h263_msmpeg4 = 1;
70
        s->h263_pred = 1;
71
        s->msmpeg4_version=2;
72
        break;
73
    case CODEC_ID_MSMPEG4V3:
74
        s->h263_msmpeg4 = 1;
75
        s->h263_pred = 1;
76
        s->msmpeg4_version=3;
77
        break;
78
    case CODEC_ID_WMV1:
79
        s->h263_msmpeg4 = 1;
80
        s->h263_pred = 1;
81
        s->msmpeg4_version=4;
82
        break;
83
    case CODEC_ID_WMV2:
84
        s->h263_msmpeg4 = 1;
85
        s->h263_pred = 1;
86
        s->msmpeg4_version=5;
87
        break;
88
    case CODEC_ID_H263I:
89
        break;
90
    case CODEC_ID_FLV1:
91
        s->h263_flv = 1;
92
        break;
93
    default:
94
        return -1;
95
    }
96
    s->codec_id= avctx->codec->id;
97

    
98
    /* for h263, we allocate the images after having read the header */
99
    if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
100
        if (MPV_common_init(s) < 0)
101
            return -1;
102

    
103
    if (s->h263_msmpeg4)
104
        ff_msmpeg4_decode_init(s);
105
    else
106
        h263_decode_init_vlc(s);
107
    
108
    return 0;
109
}
110

    
111
int ff_h263_decode_end(AVCodecContext *avctx)
112
{
113
    MpegEncContext *s = avctx->priv_data;
114

    
115
    MPV_common_end(s);
116
    return 0;
117
}
118

    
119
/**
120
 * retunrs the number of bytes consumed for building the current frame
121
 */
122
static int get_consumed_bytes(MpegEncContext *s, int buf_size){
123
    int pos= (get_bits_count(&s->gb)+7)>>3;
124
    
125
    if(s->divx_packed){
126
        //we would have to scan through the whole buf to handle the weird reordering ...
127
        return buf_size; 
128
    }else if(s->flags&CODEC_FLAG_TRUNCATED){
129
        pos -= s->parse_context.last_index;
130
        if(pos<0) pos=0; // padding is not really read so this might be -1
131
        return pos;
132
    }else{
133
        if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
134
        if(pos+10>buf_size) pos=buf_size; // oops ;)
135

    
136
        return pos;
137
    }
138
}
139

    
140
static int decode_slice(MpegEncContext *s){
141
    const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
142
    s->last_resync_gb= s->gb;
143
    s->first_slice_line= 1;
144
        
145
    s->resync_mb_x= s->mb_x;
146
    s->resync_mb_y= s->mb_y;
147

    
148
    ff_set_qscale(s, s->qscale);
149
    
150
    if(s->partitioned_frame){
151
        const int qscale= s->qscale;
152

    
153
        if(s->codec_id==CODEC_ID_MPEG4){
154
            if(ff_mpeg4_decode_partitions(s) < 0)
155
                return -1; 
156
        }
157
        
158
        /* restore variables which were modified */
159
        s->first_slice_line=1;
160
        s->mb_x= s->resync_mb_x;
161
        s->mb_y= s->resync_mb_y;
162
        ff_set_qscale(s, qscale);
163
    }
164

    
165
    for(; s->mb_y < s->mb_height; s->mb_y++) {
166
        /* per-row end of slice checks */
167
        if(s->msmpeg4_version){
168
            if(s->resync_mb_y + s->slice_height == s->mb_y){
169
                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);
170

    
171
                return 0;
172
            }
173
        }
174
        
175
        if(s->msmpeg4_version==1){
176
            s->last_dc[0]=
177
            s->last_dc[1]=
178
            s->last_dc[2]= 128;
179
        }
180
    
181
        ff_init_block_index(s);
182
        for(; s->mb_x < s->mb_width; s->mb_x++) {
183
            int ret;
184

    
185
            ff_update_block_index(s);
186

    
187
            if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
188
                s->first_slice_line=0; 
189
            }
190

    
191
            /* DCT & quantize */
192
            s->dsp.clear_blocks(s->block[0]);
193
            
194
            s->mv_dir = MV_DIR_FORWARD;
195
            s->mv_type = MV_TYPE_16X16;
196
//            s->mb_skiped = 0;
197
//printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
198
            ret= s->decode_mb(s, s->block);
199

    
200
            if (s->pict_type!=B_TYPE)
201
                ff_h263_update_motion_val(s);
202

    
203
            if(ret<0){
204
                const int xy= s->mb_x + s->mb_y*s->mb_stride;
205
                if(ret==SLICE_END){
206
                    MPV_decode_mb(s, s->block);
207
                    if(s->loop_filter)
208
                        ff_h263_loop_filter(s);
209

    
210
//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));
211
                    ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
212

    
213
                    s->padding_bug_score--;
214
                        
215
                    if(++s->mb_x >= s->mb_width){
216
                        s->mb_x=0;
217
                        ff_draw_horiz_band(s, s->mb_y*16, 16);
218
                        s->mb_y++;
219
                    }
220
                    return 0; 
221
                }else if(ret==SLICE_NOEND){
222
                    av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
223
                    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)&part_mask);
224
                    return -1;
225
                }
226
                av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
227
                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)&part_mask);
228
    
229
                return -1;
230
            }
231

    
232
            MPV_decode_mb(s, s->block);
233
            if(s->loop_filter)
234
                ff_h263_loop_filter(s);
235
        }
236
        
237
        ff_draw_horiz_band(s, s->mb_y*16, 16);
238
        
239
        s->mb_x= 0;
240
    }
241
    
242
    assert(s->mb_x==0 && s->mb_y==s->mb_height);
243

    
244
    /* try to detect the padding bug */
245
    if(      s->codec_id==CODEC_ID_MPEG4
246
       &&   (s->workaround_bugs&FF_BUG_AUTODETECT) 
247
       &&    s->gb.size_in_bits - get_bits_count(&s->gb) >=0
248
       &&    s->gb.size_in_bits - get_bits_count(&s->gb) < 48
249
//       &&   !s->resync_marker
250
       &&   !s->data_partitioning){
251
        
252
        const int bits_count= get_bits_count(&s->gb);
253
        const int bits_left = s->gb.size_in_bits - bits_count;
254
        
255
        if(bits_left==0){
256
            s->padding_bug_score+=16;
257
        }else if(bits_left>8){
258
            s->padding_bug_score++;
259
        } else if(bits_left != 1){
260
            int v= show_bits(&s->gb, 8);
261
            v|= 0x7F >> (7-(bits_count&7));
262

    
263
            if(v==0x7F)
264
                s->padding_bug_score--;
265
            else
266
                s->padding_bug_score++;            
267
        }                          
268
    }
269

    
270
    // handle formats which dont have unique end markers
271
    if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
272
        int left= s->gb.size_in_bits - get_bits_count(&s->gb);
273
        int max_extra=7;
274
        
275
        /* no markers in M$ crap */
276
        if(s->msmpeg4_version && s->pict_type==I_TYPE)
277
            max_extra+= 17;
278
        
279
        /* buggy padding but the frame should still end approximately at the bitstream end */
280
        if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_resilience>=3)
281
            max_extra+= 48;
282
        else if((s->workaround_bugs&FF_BUG_NO_PADDING))
283
            max_extra+= 256*256*256*64;
284
        
285
        if(left>max_extra){
286
            av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
287
        }
288
        else if(left<0){
289
            av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
290
        }else
291
            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);
292
        
293
        return 0;
294
    }
295

    
296
    av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n", 
297
            s->gb.size_in_bits - get_bits_count(&s->gb),
298
            show_bits(&s->gb, 24), s->padding_bug_score);
299
            
300
    ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
301

    
302
    return -1;
303
}
304

    
305
/**
306
 * finds the end of the current frame in the bitstream.
307
 * @return the position of the first byte of the next frame, or -1
308
 */
309
static int mpeg4_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
310
    ParseContext *pc= &s->parse_context;
311
    int vop_found, i;
312
    uint32_t state;
313
    
314
    vop_found= pc->frame_start_found;
315
    state= pc->state;
316
    
317
    i=0;
318
    if(!vop_found){
319
        for(i=0; i<buf_size; i++){
320
            state= (state<<8) | buf[i];
321
            if(state == 0x1B6){
322
                i++;
323
                vop_found=1;
324
                break;
325
            }
326
        }
327
    }
328

    
329
    if(vop_found){    
330
      for(; i<buf_size; i++){
331
        state= (state<<8) | buf[i];
332
        if((state&0xFFFFFF00) == 0x100){
333
            pc->frame_start_found=0;
334
            pc->state=-1; 
335
            return i-3;
336
        }
337
      }
338
    }
339
    pc->frame_start_found= vop_found;
340
    pc->state= state;
341
    return END_NOT_FOUND;
342
}
343

    
344
static int h263_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
345
    ParseContext *pc= &s->parse_context;
346
    int vop_found, i;
347
    uint32_t state;
348
    
349
    vop_found= pc->frame_start_found;
350
    state= pc->state;
351
    
352
    i=0;
353
    if(!vop_found){
354
        for(i=0; i<buf_size; i++){
355
            state= (state<<8) | buf[i];
356
            if(state>>(32-22) == 0x20){
357
                i++;
358
                vop_found=1;
359
                break;
360
            }
361
        }
362
    }
363

    
364
    if(vop_found){    
365
      for(; i<buf_size; i++){
366
        state= (state<<8) | buf[i];
367
        if(state>>(32-22) == 0x20){
368
            pc->frame_start_found=0;
369
            pc->state=-1; 
370
            return i-3;
371
        }
372
      }
373
    }
374
    pc->frame_start_found= vop_found;
375
    pc->state= state;
376
    
377
    return END_NOT_FOUND;
378
}
379

    
380
int ff_h263_decode_frame(AVCodecContext *avctx, 
381
                             void *data, int *data_size,
382
                             uint8_t *buf, int buf_size)
383
{
384
    MpegEncContext *s = avctx->priv_data;
385
    int ret;
386
    AVFrame *pict = data; 
387
    
388
#ifdef PRINT_FRAME_TIME
389
uint64_t time= rdtsc();
390
#endif
391
#ifdef DEBUG
392
    printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
393
    printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
394
#endif
395
    s->flags= avctx->flags;
396
    s->flags2= avctx->flags2;
397

    
398
    *data_size = 0;
399

    
400
    /* no supplementary picture */
401
    if (buf_size == 0) {
402
        /* special case for last picture */
403
        if (s->low_delay==0 && s->next_picture_ptr) {
404
            *pict= *(AVFrame*)s->next_picture_ptr;
405
            s->next_picture_ptr= NULL;
406

    
407
            *data_size = sizeof(AVFrame);
408
        }
409

    
410
        return 0;
411
    }
412

    
413
    if(s->flags&CODEC_FLAG_TRUNCATED){
414
        int next;
415
        
416
        if(s->codec_id==CODEC_ID_MPEG4){
417
            next= mpeg4_find_frame_end(s, buf, buf_size);
418
        }else if(s->codec_id==CODEC_ID_H263){
419
            next= h263_find_frame_end(s, buf, buf_size);
420
        }else{
421
            av_log(s->avctx, AV_LOG_ERROR, "this codec doesnt support truncated bitstreams\n");
422
            return -1;
423
        }
424
        
425
        if( ff_combine_frame(s, next, &buf, &buf_size) < 0 )
426
            return buf_size;
427
    }
428

    
429
    
430
retry:
431
    
432
    if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
433
        init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
434
    }else
435
        init_get_bits(&s->gb, buf, buf_size*8);
436
    s->bitstream_buffer_size=0;
437

    
438
    if (!s->context_initialized) {
439
        if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
440
            return -1;
441
    }
442
    
443
    //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
444
    if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
445
        int i= ff_find_unused_picture(s, 0);
446
        s->current_picture_ptr= &s->picture[i];
447
    }
448
      
449
    /* let's go :-) */
450
    if (s->msmpeg4_version==5) {
451
        ret= ff_wmv2_decode_picture_header(s);
452
    } else if (s->msmpeg4_version) {
453
        ret = msmpeg4_decode_picture_header(s);
454
    } else if (s->h263_pred) {
455
        if(s->avctx->extradata_size && s->picture_number==0){
456
            GetBitContext gb;
457
            
458
            init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
459
            ret = ff_mpeg4_decode_picture_header(s, &gb);
460
        }
461
        ret = ff_mpeg4_decode_picture_header(s, &s->gb);
462

    
463
        if(s->flags& CODEC_FLAG_LOW_DELAY)
464
            s->low_delay=1;
465
    } else if (s->codec_id == CODEC_ID_H263I) {
466
        ret = intel_h263_decode_picture_header(s);
467
    } else if (s->h263_flv) {
468
        ret = flv_h263_decode_picture_header(s);
469
    } else {
470
        ret = h263_decode_picture_header(s);
471
    }
472
    
473
    if(ret==FRAME_SKIPED) return get_consumed_bytes(s, buf_size);
474

    
475
    /* skip if the header was thrashed */
476
    if (ret < 0){
477
        av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
478
        return -1;
479
    }
480
    
481
    avctx->has_b_frames= !s->low_delay;
482
    
483
    if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
484
        if(s->avctx->stream_codec_tag == ff_get_fourcc("XVID") || 
485
           s->avctx->codec_tag == ff_get_fourcc("XVID") || s->avctx->codec_tag == ff_get_fourcc("XVIX"))
486
            s->xvid_build= -1;
487
#if 0
488
        if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
489
           && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc 
490
            s->xvid_build= -1;
491
#endif
492
    }
493

    
494
    if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
495
        if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
496
            s->divx_version= 400; //divx 4
497
    }
498

    
499
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
500
        s->workaround_bugs &= ~FF_BUG_NO_PADDING;
501
        
502
        if(s->padding_bug_score > -2 && !s->data_partitioning && (s->divx_version || !s->resync_marker))
503
            s->workaround_bugs |=  FF_BUG_NO_PADDING;
504

    
505
        if(s->avctx->codec_tag == ff_get_fourcc("XVIX")) 
506
            s->workaround_bugs|= FF_BUG_XVID_ILACE;
507

    
508
        if(s->avctx->codec_tag == ff_get_fourcc("UMP4")){
509
            s->workaround_bugs|= FF_BUG_UMP4;
510
        }
511

    
512
        if(s->divx_version>=500){
513
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
514
        }
515

    
516
        if(s->divx_version>502){
517
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
518
        }
519

    
520
        if(s->xvid_build && s->xvid_build<=3)
521
            s->padding_bug_score= 256*256*256*64;
522
        
523
        if(s->xvid_build && s->xvid_build<=1)
524
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
525

    
526
        if(s->xvid_build && s->xvid_build<=12)
527
            s->workaround_bugs|= FF_BUG_EDGE;
528

    
529
#define SET_QPEL_FUNC(postfix1, postfix2) \
530
    s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
531
    s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
532
    s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
533

    
534
        if(s->lavc_build && s->lavc_build<4653)
535
            s->workaround_bugs|= FF_BUG_STD_QPEL;
536
        
537
        if(s->lavc_build && s->lavc_build<4655)
538
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
539

    
540
        if(s->lavc_build && s->lavc_build<4670){
541
            s->workaround_bugs|= FF_BUG_EDGE;
542
        }
543

    
544
        if(s->divx_version)
545
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
546
//printf("padding_bug_score: %d\n", s->padding_bug_score);
547
        if(s->divx_version==501 && s->divx_build==20020416)
548
            s->padding_bug_score= 256*256*256*64;
549

    
550
        if(s->divx_version && s->divx_version<500){
551
            s->workaround_bugs|= FF_BUG_EDGE;
552
        }
553
        
554
#if 0
555
        if(s->divx_version==500)
556
            s->padding_bug_score= 256*256*256*64;
557

558
        /* very ugly XVID padding bug detection FIXME/XXX solve this differently
559
         * lets hope this at least works
560
         */
561
        if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
562
           && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
563
            s->workaround_bugs|= FF_BUG_NO_PADDING;
564
        
565
        if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
566
            s->workaround_bugs|= FF_BUG_NO_PADDING;
567
#endif
568
    }
569
    
570
    if(s->workaround_bugs& FF_BUG_STD_QPEL){
571
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
572
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
573
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
574
        SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
575
        SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
576
        SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
577

    
578
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
579
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
580
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
581
        SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
582
        SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
583
        SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
584
    }
585

    
586
    if(avctx->debug & FF_DEBUG_BUGS)
587
        av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n", 
588
               s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
589
               s->divx_packed ? "p" : "");
590
    
591
#if 0 // dump bits per frame / qp / complexity
592
{
593
    static FILE *f=NULL;
594
    if(!f) f=fopen("rate_qp_cplx.txt", "w");
595
    fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
596
}
597
#endif
598
       
599
        /* After H263 & mpeg4 header decode we have the height, width,*/
600
        /* and other parameters. So then we could init the picture   */
601
        /* FIXME: By the way H263 decoder is evolving it should have */
602
        /* an H263EncContext                                         */
603
    
604
    if (   s->width != avctx->width || s->height != avctx->height) {
605
        /* H.263 could change picture size any time */
606
        ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
607
        s->parse_context.buffer=0;
608
        MPV_common_end(s);
609
        s->parse_context= pc;
610
    }
611
    if (!s->context_initialized) {
612
        avctx->width = s->width;
613
        avctx->height = s->height;
614

    
615
        goto retry;
616
    }
617

    
618
    if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
619
        s->gob_index = ff_h263_get_gob_height(s);
620
    
621
    // for hurry_up==5
622
    s->current_picture.pict_type= s->pict_type;
623
    s->current_picture.key_frame= s->pict_type == I_TYPE;
624

    
625
    /* skip b frames if we dont have reference frames */
626
    if(s->last_picture_ptr==NULL && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
627
    /* skip b frames if we are in a hurry */
628
    if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
629
    /* skip everything if we are in a hurry>=5 */
630
    if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
631
    
632
    if(s->next_p_frame_damaged){
633
        if(s->pict_type==B_TYPE)
634
            return get_consumed_bytes(s, buf_size);
635
        else
636
            s->next_p_frame_damaged=0;
637
    }
638

    
639
    if(MPV_frame_start(s, avctx) < 0)
640
        return -1;
641

    
642
#ifdef DEBUG
643
    printf("qscale=%d\n", s->qscale);
644
#endif
645

    
646
    ff_er_frame_start(s);
647
    
648
    //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
649
    //which isnt available before MPV_frame_start()
650
    if (s->msmpeg4_version==5){
651
        if(ff_wmv2_decode_secondary_picture_header(s) < 0)
652
            return -1;
653
    }
654

    
655
    /* decode each macroblock */
656
    s->mb_x=0; 
657
    s->mb_y=0;
658
    
659
    decode_slice(s);
660
    while(s->mb_y<s->mb_height){
661
        if(s->msmpeg4_version){
662
            if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
663
                break;
664
        }else{
665
            if(ff_h263_resync(s)<0)
666
                break;
667
        }
668
        
669
        if(s->msmpeg4_version<4 && s->h263_pred)
670
            ff_mpeg4_clean_buffers(s);
671

    
672
        decode_slice(s);
673
    }
674

    
675
    if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
676
        if(msmpeg4_decode_ext_header(s, buf_size) < 0){
677
            s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
678
        }
679
    
680
    /* divx 5.01+ bistream reorder stuff */
681
    if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
682
        int current_pos= get_bits_count(&s->gb)>>3;
683
        int startcode_found=0;
684

    
685
        if(   buf_size - current_pos > 5 
686
           && buf_size - current_pos < BITSTREAM_BUFFER_SIZE){
687
            int i;
688
            for(i=current_pos; i<buf_size-3; i++){
689
                if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
690
                    startcode_found=1;
691
                    break;
692
                }
693
            }
694
        }
695
        if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
696
            startcode_found=1;
697
            current_pos=0;
698
        }
699

    
700
        if(startcode_found){
701
            memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
702
            s->bitstream_buffer_size= buf_size - current_pos;
703
        }
704
    }
705

    
706
    ff_er_frame_end(s);
707

    
708
    MPV_frame_end(s);
709

    
710
assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
711
assert(s->current_picture.pict_type == s->pict_type);
712
    if(s->pict_type==B_TYPE || s->low_delay){
713
        *pict= *(AVFrame*)&s->current_picture;
714
        ff_print_debug_info(s, pict);
715
    } else {
716
        *pict= *(AVFrame*)&s->last_picture;
717
        ff_print_debug_info(s, pict);
718
    }
719

    
720
    /* Return the Picture timestamp as the frame number */
721
    /* we substract 1 because it is added on utils.c    */
722
    avctx->frame_number = s->picture_number - 1;
723

    
724
    /* dont output the last pic after seeking */
725
    if(s->last_picture_ptr || s->low_delay)
726
        *data_size = sizeof(AVFrame);
727
#ifdef PRINT_FRAME_TIME
728
printf("%Ld\n", rdtsc()-time);
729
#endif
730

    
731
    return get_consumed_bytes(s, buf_size);
732
}
733

    
734
static const AVOption mpeg4_decoptions[] =
735
{
736
    AVOPTION_SUB(avoptions_workaround_bug),
737
    AVOPTION_END()
738
};
739

    
740
AVCodec mpeg4_decoder = {
741
    "mpeg4",
742
    CODEC_TYPE_VIDEO,
743
    CODEC_ID_MPEG4,
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 | CODEC_CAP_TRUNCATED,
750
    .options = mpeg4_decoptions,
751
    .flush= ff_mpeg_flush,
752
};
753

    
754
AVCodec h263_decoder = {
755
    "h263",
756
    CODEC_TYPE_VIDEO,
757
    CODEC_ID_H263,
758
    sizeof(MpegEncContext),
759
    ff_h263_decode_init,
760
    NULL,
761
    ff_h263_decode_end,
762
    ff_h263_decode_frame,
763
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
764
    .flush= ff_mpeg_flush,
765
};
766

    
767
AVCodec msmpeg4v1_decoder = {
768
    "msmpeg4v1",
769
    CODEC_TYPE_VIDEO,
770
    CODEC_ID_MSMPEG4V1,
771
    sizeof(MpegEncContext),
772
    ff_h263_decode_init,
773
    NULL,
774
    ff_h263_decode_end,
775
    ff_h263_decode_frame,
776
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
777
    mpeg4_decoptions,
778
};
779

    
780
AVCodec msmpeg4v2_decoder = {
781
    "msmpeg4v2",
782
    CODEC_TYPE_VIDEO,
783
    CODEC_ID_MSMPEG4V2,
784
    sizeof(MpegEncContext),
785
    ff_h263_decode_init,
786
    NULL,
787
    ff_h263_decode_end,
788
    ff_h263_decode_frame,
789
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
790
    mpeg4_decoptions,
791
};
792

    
793
AVCodec msmpeg4v3_decoder = {
794
    "msmpeg4",
795
    CODEC_TYPE_VIDEO,
796
    CODEC_ID_MSMPEG4V3,
797
    sizeof(MpegEncContext),
798
    ff_h263_decode_init,
799
    NULL,
800
    ff_h263_decode_end,
801
    ff_h263_decode_frame,
802
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
803
    .options = mpeg4_decoptions,
804
};
805

    
806
AVCodec wmv1_decoder = {
807
    "wmv1",
808
    CODEC_TYPE_VIDEO,
809
    CODEC_ID_WMV1,
810
    sizeof(MpegEncContext),
811
    ff_h263_decode_init,
812
    NULL,
813
    ff_h263_decode_end,
814
    ff_h263_decode_frame,
815
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
816
    mpeg4_decoptions,
817
};
818

    
819
AVCodec h263i_decoder = {
820
    "h263i",
821
    CODEC_TYPE_VIDEO,
822
    CODEC_ID_H263I,
823
    sizeof(MpegEncContext),
824
    ff_h263_decode_init,
825
    NULL,
826
    ff_h263_decode_end,
827
    ff_h263_decode_frame,
828
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
829
    mpeg4_decoptions,
830
};
831

    
832
AVCodec flv_decoder = {
833
    "flv",
834
    CODEC_TYPE_VIDEO,
835
    CODEC_ID_FLV1,
836
    sizeof(MpegEncContext),
837
    ff_h263_decode_init,
838
    NULL,
839
    ff_h263_decode_end,
840
    ff_h263_decode_frame,
841
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
842
};