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ffmpeg / libavcodec / h263dec.c @ b1114f18

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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
    MPV_decode_defaults(s);
46
    s->quant_precision=5;
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
int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
310
    int vop_found, i;
311
    uint32_t state;
312
    
313
    vop_found= pc->frame_start_found;
314
    state= pc->state;
315
    
316
    i=0;
317
    if(!vop_found){
318
        for(i=0; i<buf_size; i++){
319
            state= (state<<8) | buf[i];
320
            if(state == 0x1B6){
321
                i++;
322
                vop_found=1;
323
                break;
324
            }
325
        }
326
    }
327

    
328
    if(vop_found){
329
        /* EOF considered as end of frame */
330
        if (buf_size == 0)
331
            return 0;
332
        for(; i<buf_size; i++){
333
            state= (state<<8) | buf[i];
334
            if((state&0xFFFFFF00) == 0x100){
335
                pc->frame_start_found=0;
336
                pc->state=-1; 
337
                return i-3;
338
            }
339
        }
340
    }
341
    pc->frame_start_found= vop_found;
342
    pc->state= state;
343
    return END_NOT_FOUND;
344
}
345

    
346
static int h263_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
347
    int vop_found, i;
348
    uint32_t state;
349
    
350
    vop_found= pc->frame_start_found;
351
    state= pc->state;
352
    
353
    i=0;
354
    if(!vop_found){
355
        for(i=0; i<buf_size; i++){
356
            state= (state<<8) | buf[i];
357
            if(state>>(32-22) == 0x20){
358
                i++;
359
                vop_found=1;
360
                break;
361
            }
362
        }
363
    }
364

    
365
    if(vop_found){    
366
      for(; i<buf_size; i++){
367
        state= (state<<8) | buf[i];
368
        if(state>>(32-22) == 0x20){
369
            pc->frame_start_found=0;
370
            pc->state=-1; 
371
            return i-3;
372
        }
373
      }
374
    }
375
    pc->frame_start_found= vop_found;
376
    pc->state= state;
377
    
378
    return END_NOT_FOUND;
379
}
380

    
381
static int h263_parse(AVCodecParserContext *s,
382
                           AVCodecContext *avctx,
383
                           uint8_t **poutbuf, int *poutbuf_size, 
384
                           const uint8_t *buf, int buf_size)
385
{
386
    ParseContext *pc = s->priv_data;
387
    int next;
388
    
389
    next= h263_find_frame_end(pc, buf, buf_size);
390

    
391
    if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
392
        *poutbuf = NULL;
393
        *poutbuf_size = 0;
394
        return buf_size;
395
    }
396

    
397
    *poutbuf = (uint8_t *)buf;
398
    *poutbuf_size = buf_size;
399
    return next;
400
}
401

    
402
int ff_h263_decode_frame(AVCodecContext *avctx, 
403
                             void *data, int *data_size,
404
                             uint8_t *buf, int buf_size)
405
{
406
    MpegEncContext *s = avctx->priv_data;
407
    int ret;
408
    AVFrame *pict = data; 
409
    
410
#ifdef PRINT_FRAME_TIME
411
uint64_t time= rdtsc();
412
#endif
413
#ifdef DEBUG
414
    printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
415
    printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
416
#endif
417
    s->flags= avctx->flags;
418
    s->flags2= avctx->flags2;
419

    
420
    /* no supplementary picture */
421
    if (buf_size == 0) {
422
        /* special case for last picture */
423
        if (s->low_delay==0 && s->next_picture_ptr) {
424
            *pict= *(AVFrame*)s->next_picture_ptr;
425
            s->next_picture_ptr= NULL;
426

    
427
            *data_size = sizeof(AVFrame);
428
        }
429

    
430
        return 0;
431
    }
432

    
433
    if(s->flags&CODEC_FLAG_TRUNCATED){
434
        int next;
435
        
436
        if(s->codec_id==CODEC_ID_MPEG4){
437
            next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
438
        }else if(s->codec_id==CODEC_ID_H263){
439
            next= h263_find_frame_end(&s->parse_context, buf, buf_size);
440
        }else{
441
            av_log(s->avctx, AV_LOG_ERROR, "this codec doesnt support truncated bitstreams\n");
442
            return -1;
443
        }
444
        
445
        if( ff_combine_frame(&s->parse_context, next, &buf, &buf_size) < 0 )
446
            return buf_size;
447
    }
448

    
449
    
450
retry:
451
    
452
    if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
453
        init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
454
    }else
455
        init_get_bits(&s->gb, buf, buf_size*8);
456
    s->bitstream_buffer_size=0;
457

    
458
    if (!s->context_initialized) {
459
        if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
460
            return -1;
461
    }
462
    
463
    //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
464
    if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
465
        int i= ff_find_unused_picture(s, 0);
466
        s->current_picture_ptr= &s->picture[i];
467
    }
468
      
469
    /* let's go :-) */
470
    if (s->msmpeg4_version==5) {
471
        ret= ff_wmv2_decode_picture_header(s);
472
    } else if (s->msmpeg4_version) {
473
        ret = msmpeg4_decode_picture_header(s);
474
    } else if (s->h263_pred) {
475
        if(s->avctx->extradata_size && s->picture_number==0){
476
            GetBitContext gb;
477
            
478
            init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
479
            ret = ff_mpeg4_decode_picture_header(s, &gb);
480
        }
481
        ret = ff_mpeg4_decode_picture_header(s, &s->gb);
482

    
483
        if(s->flags& CODEC_FLAG_LOW_DELAY)
484
            s->low_delay=1;
485
    } else if (s->codec_id == CODEC_ID_H263I) {
486
        ret = intel_h263_decode_picture_header(s);
487
    } else if (s->h263_flv) {
488
        ret = flv_h263_decode_picture_header(s);
489
    } else {
490
        ret = h263_decode_picture_header(s);
491
    }
492
    
493
    if(ret==FRAME_SKIPED) return get_consumed_bytes(s, buf_size);
494

    
495
    /* skip if the header was thrashed */
496
    if (ret < 0){
497
        av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
498
        return -1;
499
    }
500
    
501
    avctx->has_b_frames= !s->low_delay;
502
    
503
    if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
504
        if(s->avctx->stream_codec_tag == ff_get_fourcc("XVID") || 
505
           s->avctx->codec_tag == ff_get_fourcc("XVID") || s->avctx->codec_tag == ff_get_fourcc("XVIX"))
506
            s->xvid_build= -1;
507
#if 0
508
        if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
509
           && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc 
510
            s->xvid_build= -1;
511
#endif
512
    }
513

    
514
    if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
515
        if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
516
            s->divx_version= 400; //divx 4
517
    }
518

    
519
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
520
        s->workaround_bugs &= ~FF_BUG_NO_PADDING;
521
        
522
        if(s->padding_bug_score > -2 && !s->data_partitioning && (s->divx_version || !s->resync_marker))
523
            s->workaround_bugs |=  FF_BUG_NO_PADDING;
524

    
525
        if(s->avctx->codec_tag == ff_get_fourcc("XVIX")) 
526
            s->workaround_bugs|= FF_BUG_XVID_ILACE;
527

    
528
        if(s->avctx->codec_tag == ff_get_fourcc("UMP4")){
529
            s->workaround_bugs|= FF_BUG_UMP4;
530
        }
531

    
532
        if(s->divx_version>=500){
533
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
534
        }
535

    
536
        if(s->divx_version>502){
537
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
538
        }
539

    
540
        if(s->xvid_build && s->xvid_build<=3)
541
            s->padding_bug_score= 256*256*256*64;
542
        
543
        if(s->xvid_build && s->xvid_build<=1)
544
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
545

    
546
        if(s->xvid_build && s->xvid_build<=12)
547
            s->workaround_bugs|= FF_BUG_EDGE;
548

    
549
        if(s->xvid_build && s->xvid_build<=32)
550
            s->workaround_bugs|= FF_BUG_DC_CLIP;
551

    
552
#define SET_QPEL_FUNC(postfix1, postfix2) \
553
    s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
554
    s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
555
    s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
556

    
557
        if(s->lavc_build && s->lavc_build<4653)
558
            s->workaround_bugs|= FF_BUG_STD_QPEL;
559
        
560
        if(s->lavc_build && s->lavc_build<4655)
561
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
562

    
563
        if(s->lavc_build && s->lavc_build<4670){
564
            s->workaround_bugs|= FF_BUG_EDGE;
565
        }
566
        
567
        if(s->lavc_build && s->lavc_build<=4712)
568
            s->workaround_bugs|= FF_BUG_DC_CLIP;
569

    
570
        if(s->divx_version)
571
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
572
//printf("padding_bug_score: %d\n", s->padding_bug_score);
573
        if(s->divx_version==501 && s->divx_build==20020416)
574
            s->padding_bug_score= 256*256*256*64;
575

    
576
        if(s->divx_version && s->divx_version<500){
577
            s->workaround_bugs|= FF_BUG_EDGE;
578
        }
579
        
580
        if(s->divx_version)
581
            s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
582
#if 0
583
        if(s->divx_version==500)
584
            s->padding_bug_score= 256*256*256*64;
585

586
        /* very ugly XVID padding bug detection FIXME/XXX solve this differently
587
         * lets hope this at least works
588
         */
589
        if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
590
           && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
591
            s->workaround_bugs|= FF_BUG_NO_PADDING;
592
        
593
        if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
594
            s->workaround_bugs|= FF_BUG_NO_PADDING;
595
#endif
596
    }
597
    
598
    if(s->workaround_bugs& FF_BUG_STD_QPEL){
599
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
600
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
601
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
602
        SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
603
        SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
604
        SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
605

    
606
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
607
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
608
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
609
        SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
610
        SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
611
        SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
612
    }
613

    
614
    if(avctx->debug & FF_DEBUG_BUGS)
615
        av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n", 
616
               s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
617
               s->divx_packed ? "p" : "");
618
    
619
#if 0 // dump bits per frame / qp / complexity
620
{
621
    static FILE *f=NULL;
622
    if(!f) f=fopen("rate_qp_cplx.txt", "w");
623
    fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
624
}
625
#endif
626

    
627
#ifdef HAVE_MMX
628
    if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & MM_MMX) && !(s->flags&CODEC_FLAG_BITEXACT)){
629
        avctx->idct_algo= FF_IDCT_LIBMPEG2MMX;
630
        avctx->width= 0; // force reinit
631
    }
632
#endif
633

    
634
        /* After H263 & mpeg4 header decode we have the height, width,*/
635
        /* and other parameters. So then we could init the picture   */
636
        /* FIXME: By the way H263 decoder is evolving it should have */
637
        /* an H263EncContext                                         */
638
    
639
    if (   s->width != avctx->width || s->height != avctx->height) {
640
        /* H.263 could change picture size any time */
641
        ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
642
        s->parse_context.buffer=0;
643
        MPV_common_end(s);
644
        s->parse_context= pc;
645
    }
646
    if (!s->context_initialized) {
647
        avctx->width = s->width;
648
        avctx->height = s->height;
649

    
650
        goto retry;
651
    }
652

    
653
    if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
654
        s->gob_index = ff_h263_get_gob_height(s);
655
    
656
    // for hurry_up==5
657
    s->current_picture.pict_type= s->pict_type;
658
    s->current_picture.key_frame= s->pict_type == I_TYPE;
659

    
660
    /* skip b frames if we dont have reference frames */
661
    if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
662
    /* skip b frames if we are in a hurry */
663
    if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
664
    /* skip everything if we are in a hurry>=5 */
665
    if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
666
    
667
    if(s->next_p_frame_damaged){
668
        if(s->pict_type==B_TYPE)
669
            return get_consumed_bytes(s, buf_size);
670
        else
671
            s->next_p_frame_damaged=0;
672
    }
673

    
674
    if(MPV_frame_start(s, avctx) < 0)
675
        return -1;
676

    
677
#ifdef DEBUG
678
    printf("qscale=%d\n", s->qscale);
679
#endif
680

    
681
    ff_er_frame_start(s);
682
    
683
    //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
684
    //which isnt available before MPV_frame_start()
685
    if (s->msmpeg4_version==5){
686
        if(ff_wmv2_decode_secondary_picture_header(s) < 0)
687
            return -1;
688
    }
689

    
690
    /* decode each macroblock */
691
    s->mb_x=0; 
692
    s->mb_y=0;
693
    
694
    decode_slice(s);
695
    while(s->mb_y<s->mb_height){
696
        if(s->msmpeg4_version){
697
            if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
698
                break;
699
        }else{
700
            if(ff_h263_resync(s)<0)
701
                break;
702
        }
703
        
704
        if(s->msmpeg4_version<4 && s->h263_pred)
705
            ff_mpeg4_clean_buffers(s);
706

    
707
        decode_slice(s);
708
    }
709

    
710
    if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
711
        if(msmpeg4_decode_ext_header(s, buf_size) < 0){
712
            s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
713
        }
714
    
715
    /* divx 5.01+ bistream reorder stuff */
716
    if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
717
        int current_pos= get_bits_count(&s->gb)>>3;
718
        int startcode_found=0;
719

    
720
        if(   buf_size - current_pos > 5 
721
           && buf_size - current_pos < BITSTREAM_BUFFER_SIZE){
722
            int i;
723
            for(i=current_pos; i<buf_size-3; i++){
724
                if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
725
                    startcode_found=1;
726
                    break;
727
                }
728
            }
729
        }
730
        if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
731
            startcode_found=1;
732
            current_pos=0;
733
        }
734

    
735
        if(startcode_found){
736
            memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
737
            s->bitstream_buffer_size= buf_size - current_pos;
738
        }
739
    }
740

    
741
    ff_er_frame_end(s);
742

    
743
    MPV_frame_end(s);
744

    
745
assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
746
assert(s->current_picture.pict_type == s->pict_type);
747
    if(s->pict_type==B_TYPE || s->low_delay){
748
        *pict= *(AVFrame*)&s->current_picture;
749
        ff_print_debug_info(s, pict);
750
    } else {
751
        *pict= *(AVFrame*)&s->last_picture;
752
        if(pict)
753
            ff_print_debug_info(s, pict);
754
    }
755

    
756
    /* Return the Picture timestamp as the frame number */
757
    /* we substract 1 because it is added on utils.c    */
758
    avctx->frame_number = s->picture_number - 1;
759

    
760
    /* dont output the last pic after seeking */
761
    if(s->last_picture_ptr || s->low_delay)
762
        *data_size = sizeof(AVFrame);
763
#ifdef PRINT_FRAME_TIME
764
printf("%Ld\n", rdtsc()-time);
765
#endif
766

    
767
    return get_consumed_bytes(s, buf_size);
768
}
769

    
770
static const AVOption mpeg4_decoptions[] =
771
{
772
    AVOPTION_SUB(avoptions_workaround_bug),
773
    AVOPTION_END()
774
};
775

    
776
AVCodec mpeg4_decoder = {
777
    "mpeg4",
778
    CODEC_TYPE_VIDEO,
779
    CODEC_ID_MPEG4,
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 | CODEC_CAP_TRUNCATED,
786
    .options = mpeg4_decoptions,
787
    .flush= ff_mpeg_flush,
788
};
789

    
790
AVCodec h263_decoder = {
791
    "h263",
792
    CODEC_TYPE_VIDEO,
793
    CODEC_ID_H263,
794
    sizeof(MpegEncContext),
795
    ff_h263_decode_init,
796
    NULL,
797
    ff_h263_decode_end,
798
    ff_h263_decode_frame,
799
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
800
    .flush= ff_mpeg_flush,
801
};
802

    
803
AVCodec msmpeg4v1_decoder = {
804
    "msmpeg4v1",
805
    CODEC_TYPE_VIDEO,
806
    CODEC_ID_MSMPEG4V1,
807
    sizeof(MpegEncContext),
808
    ff_h263_decode_init,
809
    NULL,
810
    ff_h263_decode_end,
811
    ff_h263_decode_frame,
812
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
813
    mpeg4_decoptions,
814
};
815

    
816
AVCodec msmpeg4v2_decoder = {
817
    "msmpeg4v2",
818
    CODEC_TYPE_VIDEO,
819
    CODEC_ID_MSMPEG4V2,
820
    sizeof(MpegEncContext),
821
    ff_h263_decode_init,
822
    NULL,
823
    ff_h263_decode_end,
824
    ff_h263_decode_frame,
825
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
826
    mpeg4_decoptions,
827
};
828

    
829
AVCodec msmpeg4v3_decoder = {
830
    "msmpeg4",
831
    CODEC_TYPE_VIDEO,
832
    CODEC_ID_MSMPEG4V3,
833
    sizeof(MpegEncContext),
834
    ff_h263_decode_init,
835
    NULL,
836
    ff_h263_decode_end,
837
    ff_h263_decode_frame,
838
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
839
    .options = mpeg4_decoptions,
840
};
841

    
842
AVCodec wmv1_decoder = {
843
    "wmv1",
844
    CODEC_TYPE_VIDEO,
845
    CODEC_ID_WMV1,
846
    sizeof(MpegEncContext),
847
    ff_h263_decode_init,
848
    NULL,
849
    ff_h263_decode_end,
850
    ff_h263_decode_frame,
851
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
852
    mpeg4_decoptions,
853
};
854

    
855
AVCodec h263i_decoder = {
856
    "h263i",
857
    CODEC_TYPE_VIDEO,
858
    CODEC_ID_H263I,
859
    sizeof(MpegEncContext),
860
    ff_h263_decode_init,
861
    NULL,
862
    ff_h263_decode_end,
863
    ff_h263_decode_frame,
864
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
865
    mpeg4_decoptions,
866
};
867

    
868
AVCodec flv_decoder = {
869
    "flv",
870
    CODEC_TYPE_VIDEO,
871
    CODEC_ID_FLV1,
872
    sizeof(MpegEncContext),
873
    ff_h263_decode_init,
874
    NULL,
875
    ff_h263_decode_end,
876
    ff_h263_decode_frame,
877
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
878
};
879

    
880
AVCodecParser h263_parser = {
881
    { CODEC_ID_H263 },
882
    sizeof(ParseContext),
883
    NULL,
884
    h263_parse,
885
    ff_parse_close,
886
};