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ffmpeg / libavcodec / h263dec.c @ 8f2ab833

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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

    
397
    *data_size = 0;
398

    
399
    /* no supplementary picture */
400
    if (buf_size == 0) {
401
        /* special case for last picture */
402
        if (s->low_delay==0 && s->next_picture_ptr) {
403
            *pict= *(AVFrame*)s->next_picture_ptr;
404
            s->next_picture_ptr= NULL;
405

    
406
            *data_size = sizeof(AVFrame);
407
        }
408

    
409
        return 0;
410
    }
411

    
412
    if(s->flags&CODEC_FLAG_TRUNCATED){
413
        int next;
414
        
415
        if(s->codec_id==CODEC_ID_MPEG4){
416
            next= mpeg4_find_frame_end(s, buf, buf_size);
417
        }else if(s->codec_id==CODEC_ID_H263){
418
            next= h263_find_frame_end(s, buf, buf_size);
419
        }else{
420
            av_log(s->avctx, AV_LOG_ERROR, "this codec doesnt support truncated bitstreams\n");
421
            return -1;
422
        }
423
        
424
        if( ff_combine_frame(s, next, &buf, &buf_size) < 0 )
425
            return buf_size;
426
    }
427

    
428
retry:
429
    
430
    if(s->bitstream_buffer_size && buf_size<20){ //divx 5.01+ frame reorder
431
        init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
432
    }else
433
        init_get_bits(&s->gb, buf, buf_size*8);
434
    s->bitstream_buffer_size=0;
435

    
436
    if (!s->context_initialized) {
437
        if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
438
            return -1;
439
    }
440
    
441
    //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
442
    if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
443
        int i= ff_find_unused_picture(s, 0);
444
        s->current_picture_ptr= &s->picture[i];
445
    }
446
      
447
    /* let's go :-) */
448
    if (s->msmpeg4_version==5) {
449
        ret= ff_wmv2_decode_picture_header(s);
450
    } else if (s->msmpeg4_version) {
451
        ret = msmpeg4_decode_picture_header(s);
452
    } else if (s->h263_pred) {
453
        if(s->avctx->extradata_size && s->picture_number==0){
454
            GetBitContext gb;
455
            
456
            init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
457
            ret = ff_mpeg4_decode_picture_header(s, &gb);
458
        }
459
        ret = ff_mpeg4_decode_picture_header(s, &s->gb);
460

    
461
        if(s->flags& CODEC_FLAG_LOW_DELAY)
462
            s->low_delay=1;
463
    } else if (s->codec_id == CODEC_ID_H263I) {
464
        ret = intel_h263_decode_picture_header(s);
465
    } else if (s->h263_flv) {
466
        ret = flv_h263_decode_picture_header(s);
467
    } else {
468
        ret = h263_decode_picture_header(s);
469
    }
470
    
471
    if(ret==FRAME_SKIPED) return get_consumed_bytes(s, buf_size);
472

    
473
    /* skip if the header was thrashed */
474
    if (ret < 0){
475
        av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
476
        return -1;
477
    }
478
    
479
    avctx->has_b_frames= !s->low_delay;
480
    
481
    if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
482
        if(s->avctx->stream_codec_tag == ff_get_fourcc("XVID") || 
483
           s->avctx->codec_tag == ff_get_fourcc("XVID") || s->avctx->codec_tag == ff_get_fourcc("XVIX"))
484
            s->xvid_build= -1;
485
#if 0
486
        if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
487
           && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc 
488
            s->xvid_build= -1;
489
#endif
490
    }
491

    
492
    if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
493
        if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
494
            s->divx_version= 400; //divx 4
495
    }
496

    
497
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
498
        s->workaround_bugs &= ~FF_BUG_NO_PADDING;
499
        
500
        if(s->padding_bug_score > -2 && !s->data_partitioning && (s->divx_version || !s->resync_marker))
501
            s->workaround_bugs |=  FF_BUG_NO_PADDING;
502

    
503
        if(s->avctx->codec_tag == ff_get_fourcc("XVIX")) 
504
            s->workaround_bugs|= FF_BUG_XVID_ILACE;
505

    
506
        if(s->avctx->codec_tag == ff_get_fourcc("UMP4")){
507
            s->workaround_bugs|= FF_BUG_UMP4;
508
        }
509

    
510
        if(s->divx_version>=500){
511
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
512
        }
513

    
514
        if(s->divx_version>502){
515
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
516
        }
517

    
518
        if(s->xvid_build && s->xvid_build<=3)
519
            s->padding_bug_score= 256*256*256*64;
520
        
521
        if(s->xvid_build && s->xvid_build<=1)
522
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
523

    
524
        if(s->xvid_build && s->xvid_build<=12)
525
            s->workaround_bugs|= FF_BUG_EDGE;
526

    
527
#define SET_QPEL_FUNC(postfix1, postfix2) \
528
    s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
529
    s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
530
    s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
531

    
532
        if(s->lavc_build && s->lavc_build<4653)
533
            s->workaround_bugs|= FF_BUG_STD_QPEL;
534
        
535
        if(s->lavc_build && s->lavc_build<4655)
536
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
537

    
538
        if(s->lavc_build && s->lavc_build<4670){
539
            s->workaround_bugs|= FF_BUG_EDGE;
540
        }
541

    
542
        if(s->divx_version)
543
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
544
//printf("padding_bug_score: %d\n", s->padding_bug_score);
545
        if(s->divx_version==501 && s->divx_build==20020416)
546
            s->padding_bug_score= 256*256*256*64;
547

    
548
        if(s->divx_version && s->divx_version<500){
549
            s->workaround_bugs|= FF_BUG_EDGE;
550
        }
551
        
552
#if 0
553
        if(s->divx_version==500)
554
            s->padding_bug_score= 256*256*256*64;
555

556
        /* very ugly XVID padding bug detection FIXME/XXX solve this differently
557
         * lets hope this at least works
558
         */
559
        if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
560
           && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
561
            s->workaround_bugs|= FF_BUG_NO_PADDING;
562
        
563
        if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
564
            s->workaround_bugs|= FF_BUG_NO_PADDING;
565
#endif
566
    }
567
    
568
    if(s->workaround_bugs& FF_BUG_STD_QPEL){
569
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
570
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
571
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
572
        SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
573
        SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
574
        SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
575

    
576
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
577
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
578
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
579
        SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
580
        SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
581
        SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
582
    }
583

    
584
    if(avctx->debug & FF_DEBUG_BUGS)
585
        av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n", 
586
               s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
587
               s->divx_packed ? "p" : "");
588
    
589
#if 0 // dump bits per frame / qp / complexity
590
{
591
    static FILE *f=NULL;
592
    if(!f) f=fopen("rate_qp_cplx.txt", "w");
593
    fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
594
}
595
#endif
596
       
597
        /* After H263 & mpeg4 header decode we have the height, width,*/
598
        /* and other parameters. So then we could init the picture   */
599
        /* FIXME: By the way H263 decoder is evolving it should have */
600
        /* an H263EncContext                                         */
601
    
602
    if (   s->width != avctx->width || s->height != avctx->height) {
603
        /* H.263 could change picture size any time */
604
        ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
605
        s->parse_context.buffer=0;
606
        MPV_common_end(s);
607
        s->parse_context= pc;
608
    }
609
    if (!s->context_initialized) {
610
        avctx->width = s->width;
611
        avctx->height = s->height;
612

    
613
        goto retry;
614
    }
615

    
616
    if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
617
        s->gob_index = ff_h263_get_gob_height(s);
618
    
619
    // for hurry_up==5
620
    s->current_picture.pict_type= s->pict_type;
621
    s->current_picture.key_frame= s->pict_type == I_TYPE;
622

    
623
    /* skip b frames if we dont have reference frames */
624
    if(s->last_picture_ptr==NULL && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
625
    /* skip b frames if we are in a hurry */
626
    if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
627
    /* skip everything if we are in a hurry>=5 */
628
    if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
629
    
630
    if(s->next_p_frame_damaged){
631
        if(s->pict_type==B_TYPE)
632
            return get_consumed_bytes(s, buf_size);
633
        else
634
            s->next_p_frame_damaged=0;
635
    }
636

    
637
    if(MPV_frame_start(s, avctx) < 0)
638
        return -1;
639

    
640
#ifdef DEBUG
641
    printf("qscale=%d\n", s->qscale);
642
#endif
643

    
644
    ff_er_frame_start(s);
645
    
646
    //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
647
    //which isnt available before MPV_frame_start()
648
    if (s->msmpeg4_version==5){
649
        if(ff_wmv2_decode_secondary_picture_header(s) < 0)
650
            return -1;
651
    }
652

    
653
    /* decode each macroblock */
654
    s->mb_x=0; 
655
    s->mb_y=0;
656
    
657
    decode_slice(s);
658
    while(s->mb_y<s->mb_height){
659
        if(s->msmpeg4_version){
660
            if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
661
                break;
662
        }else{
663
            if(ff_h263_resync(s)<0)
664
                break;
665
        }
666
        
667
        if(s->msmpeg4_version<4 && s->h263_pred)
668
            ff_mpeg4_clean_buffers(s);
669

    
670
        decode_slice(s);
671
    }
672

    
673
    if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
674
        if(msmpeg4_decode_ext_header(s, buf_size) < 0){
675
            s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
676
        }
677
    
678
    /* divx 5.01+ bistream reorder stuff */
679
    if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
680
        int current_pos= get_bits_count(&s->gb)>>3;
681

    
682
        if(   buf_size - current_pos > 5 
683
           && buf_size - current_pos < BITSTREAM_BUFFER_SIZE){
684
            int i;
685
            int startcode_found=0;
686
            for(i=current_pos; i<buf_size-3; i++){
687
                if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
688
                    startcode_found=1;
689
                    break;
690
                }
691
            }
692
            if(startcode_found){
693
                memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
694
                s->bitstream_buffer_size= buf_size - current_pos;
695
            }
696
        }
697
    }
698

    
699
    ff_er_frame_end(s);
700

    
701
    MPV_frame_end(s);
702

    
703
assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
704
assert(s->current_picture.pict_type == s->pict_type);
705
    if(s->pict_type==B_TYPE || s->low_delay){
706
        *pict= *(AVFrame*)&s->current_picture;
707
        ff_print_debug_info(s, pict);
708
    } else {
709
        *pict= *(AVFrame*)&s->last_picture;
710
        ff_print_debug_info(s, pict);
711
    }
712

    
713
    /* Return the Picture timestamp as the frame number */
714
    /* we substract 1 because it is added on utils.c    */
715
    avctx->frame_number = s->picture_number - 1;
716

    
717
    /* dont output the last pic after seeking */
718
    if(s->last_picture_ptr || s->low_delay)
719
        *data_size = sizeof(AVFrame);
720
#ifdef PRINT_FRAME_TIME
721
printf("%Ld\n", rdtsc()-time);
722
#endif
723

    
724
    return get_consumed_bytes(s, buf_size);
725
}
726

    
727
static const AVOption mpeg4_decoptions[] =
728
{
729
    AVOPTION_SUB(avoptions_workaround_bug),
730
    AVOPTION_END()
731
};
732

    
733
AVCodec mpeg4_decoder = {
734
    "mpeg4",
735
    CODEC_TYPE_VIDEO,
736
    CODEC_ID_MPEG4,
737
    sizeof(MpegEncContext),
738
    ff_h263_decode_init,
739
    NULL,
740
    ff_h263_decode_end,
741
    ff_h263_decode_frame,
742
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
743
    .options = mpeg4_decoptions,
744
    .flush= ff_mpeg_flush,
745
};
746

    
747
AVCodec h263_decoder = {
748
    "h263",
749
    CODEC_TYPE_VIDEO,
750
    CODEC_ID_H263,
751
    sizeof(MpegEncContext),
752
    ff_h263_decode_init,
753
    NULL,
754
    ff_h263_decode_end,
755
    ff_h263_decode_frame,
756
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
757
    .flush= ff_mpeg_flush,
758
};
759

    
760
AVCodec msmpeg4v1_decoder = {
761
    "msmpeg4v1",
762
    CODEC_TYPE_VIDEO,
763
    CODEC_ID_MSMPEG4V1,
764
    sizeof(MpegEncContext),
765
    ff_h263_decode_init,
766
    NULL,
767
    ff_h263_decode_end,
768
    ff_h263_decode_frame,
769
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
770
    mpeg4_decoptions,
771
};
772

    
773
AVCodec msmpeg4v2_decoder = {
774
    "msmpeg4v2",
775
    CODEC_TYPE_VIDEO,
776
    CODEC_ID_MSMPEG4V2,
777
    sizeof(MpegEncContext),
778
    ff_h263_decode_init,
779
    NULL,
780
    ff_h263_decode_end,
781
    ff_h263_decode_frame,
782
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
783
    mpeg4_decoptions,
784
};
785

    
786
AVCodec msmpeg4v3_decoder = {
787
    "msmpeg4",
788
    CODEC_TYPE_VIDEO,
789
    CODEC_ID_MSMPEG4V3,
790
    sizeof(MpegEncContext),
791
    ff_h263_decode_init,
792
    NULL,
793
    ff_h263_decode_end,
794
    ff_h263_decode_frame,
795
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
796
    .options = mpeg4_decoptions,
797
};
798

    
799
AVCodec wmv1_decoder = {
800
    "wmv1",
801
    CODEC_TYPE_VIDEO,
802
    CODEC_ID_WMV1,
803
    sizeof(MpegEncContext),
804
    ff_h263_decode_init,
805
    NULL,
806
    ff_h263_decode_end,
807
    ff_h263_decode_frame,
808
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
809
    mpeg4_decoptions,
810
};
811

    
812
AVCodec h263i_decoder = {
813
    "h263i",
814
    CODEC_TYPE_VIDEO,
815
    CODEC_ID_H263I,
816
    sizeof(MpegEncContext),
817
    ff_h263_decode_init,
818
    NULL,
819
    ff_h263_decode_end,
820
    ff_h263_decode_frame,
821
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
822
    mpeg4_decoptions,
823
};
824

    
825
AVCodec flv_decoder = {
826
    "flv",
827
    CODEC_TYPE_VIDEO,
828
    CODEC_ID_FLV1,
829
    sizeof(MpegEncContext),
830
    ff_h263_decode_init,
831
    NULL,
832
    ff_h263_decode_end,
833
    ff_h263_decode_frame,
834
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
835
};