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ffmpeg / libavcodec / h263dec.c @ 067ff8b1

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1
/*
2
 * H.263 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
 
20
/**
21
 * @file h263dec.c
22
 * H.263 decoder.
23
 */
24
 
25
#include "avcodec.h"
26
#include "dsputil.h"
27
#include "mpegvideo.h"
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_packed){
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
    const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
148
    s->last_resync_gb= s->gb;
149
    s->first_slice_line= 1;
150
        
151
    s->resync_mb_x= s->mb_x;
152
    s->resync_mb_y= s->mb_y;
153

    
154
    s->y_dc_scale= s->y_dc_scale_table[ s->qscale ];
155
    s->c_dc_scale= s->c_dc_scale_table[ s->qscale ];
156
    
157
    if(s->partitioned_frame){
158
        const int qscale= s->qscale;
159

    
160
        if(s->codec_id==CODEC_ID_MPEG4){
161
            if(ff_mpeg4_decode_partitions(s) < 0)
162
                return -1; 
163
        }
164
        
165
        /* restore variables which where modified */
166
        s->first_slice_line=1;
167
        s->mb_x= s->resync_mb_x;
168
        s->mb_y= s->resync_mb_y;
169
        s->qscale= qscale;
170
        s->y_dc_scale= s->y_dc_scale_table[ s->qscale ];
171
        s->c_dc_scale= s->c_dc_scale_table[ s->qscale ];
172
    }
173

    
174
    for(; s->mb_y < s->mb_height; s->mb_y++) {
175
        /* per-row end of slice checks */
176
        if(s->msmpeg4_version){
177
            if(s->resync_mb_y + s->slice_height == s->mb_y){
178
                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);
179

    
180
                return 0;
181
            }
182
        }
183
        
184
        if(s->msmpeg4_version==1){
185
            s->last_dc[0]=
186
            s->last_dc[1]=
187
            s->last_dc[2]= 128;
188
        }
189
    
190
        ff_init_block_index(s);
191
        for(; s->mb_x < s->mb_width; s->mb_x++) {
192
            int ret;
193

    
194
            ff_update_block_index(s);
195

    
196
            if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
197
                s->first_slice_line=0; 
198
            }
199

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

    
211
            if(ret<0){
212
                const int xy= s->mb_x + s->mb_y*s->mb_stride;
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
                    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);
216

    
217
                    s->padding_bug_score--;
218
                        
219
                    if(++s->mb_x >= s->mb_width){
220
                        s->mb_x=0;
221
                        ff_draw_horiz_band(s, s->mb_y*16, 16);
222
                        s->mb_y++;
223
                    }
224
                    return 0; 
225
                }else if(ret==SLICE_NOEND){
226
                    fprintf(stderr,"Slice mismatch at MB: %d\n", xy);
227
                    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);
228
                    return -1;
229
                }
230
                fprintf(stderr,"Error at MB: %d\n", xy);
231
                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);
232
    
233
                return -1;
234
            }
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
            fprintf(stderr, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
287
        }
288
        else if(left<0){
289
            fprintf(stderr, "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
    fprintf(stderr, "slice end not reached but screenspace end (%d left %06X)\n", 
297
            s->gb.size_in_bits - get_bits_count(&s->gb),
298
            show_bits(&s->gb, 24));
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
/**
345
 * draws an line from (ex, ey) -> (sx, sy).
346
 * @param w width of the image
347
 * @param h height of the image
348
 * @param stride stride/linesize of the image
349
 * @param color color of the arrow
350
 */
351
static void draw_line(uint8_t *buf, int sx, int sy, int ex, int ey, int w, int h, int stride, int color){
352
    int t, x, y, f;
353
    
354
    ex= clip(ex, 0, w-1);
355
    ey= clip(ey, 0, h-1);
356
    
357
    buf[sy*stride + sx]+= color;
358
    
359
    if(ABS(ex - sx) > ABS(ey - sy)){
360
        if(sx > ex){
361
            t=sx; sx=ex; ex=t;
362
            t=sy; sy=ey; ey=t;
363
        }
364
        buf+= sx + sy*stride;
365
        ex-= sx;
366
        f= ((ey-sy)<<16)/ex;
367
        for(x= 0; x <= ex; x++){
368
            y= ((x*f) + (1<<15))>>16;
369
            buf[y*stride + x]+= color;
370
        }
371
    }else{
372
        if(sy > ey){
373
            t=sx; sx=ex; ex=t;
374
            t=sy; sy=ey; ey=t;
375
        }
376
        buf+= sx + sy*stride;
377
        ey-= sy;
378
        if(ey) f= ((ex-sx)<<16)/ey;
379
        else   f= 0;
380
        for(y= 0; y <= ey; y++){
381
            x= ((y*f) + (1<<15))>>16;
382
            buf[y*stride + x]+= color;
383
        }
384
    }
385
}
386

    
387
/**
388
 * draws an arrow from (ex, ey) -> (sx, sy).
389
 * @param w width of the image
390
 * @param h height of the image
391
 * @param stride stride/linesize of the image
392
 * @param color color of the arrow
393
 */
394
static void draw_arrow(uint8_t *buf, int sx, int sy, int ex, int ey, int w, int h, int stride, int color){ 
395
    int dx= ex - sx;
396
    int dy= ey - sy;
397
    
398
    if(dx*dx + dy*dy > 3*3){
399
        int rx=  dx + dy;
400
        int ry= -dx + dy;
401
        int length= ff_sqrt((rx*rx + ry*ry)<<8);
402
        
403
        //FIXME subpixel accuracy
404
        rx= ROUNDED_DIV(rx*3<<4, length);
405
        ry= ROUNDED_DIV(ry*3<<4, length);
406
        
407
        draw_line(buf, sx, sy, sx + rx, sy + ry, w, h, stride, color);
408
        draw_line(buf, sx, sy, sx - ry, sy + rx, w, h, stride, color);
409
    }
410
    draw_line(buf, sx, sy, ex, ey, w, h, stride, color);
411
}
412

    
413
int ff_h263_decode_frame(AVCodecContext *avctx, 
414
                             void *data, int *data_size,
415
                             uint8_t *buf, int buf_size)
416
{
417
    MpegEncContext *s = avctx->priv_data;
418
    int ret,i;
419
    AVFrame *pict = data; 
420
    float new_aspect;
421
    
422
#ifdef PRINT_FRAME_TIME
423
uint64_t time= rdtsc();
424
#endif
425
#ifdef DEBUG
426
    printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
427
    printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
428
#endif
429
    s->flags= avctx->flags;
430

    
431
    *data_size = 0;
432
   
433
   /* no supplementary picture */
434
    if (buf_size == 0) {
435
        return 0;
436
    }
437

    
438
    if(s->flags&CODEC_FLAG_TRUNCATED){
439
        int next;
440
        
441
        if(s->codec_id==CODEC_ID_MPEG4){
442
            next= mpeg4_find_frame_end(s, buf, buf_size);
443
        }else{
444
            fprintf(stderr, "this codec doesnt support truncated bitstreams\n");
445
            return -1;
446
        }
447
        
448
        if( ff_combine_frame(s, next, &buf, &buf_size) < 0 )
449
            return buf_size;
450
    }
451

    
452
retry:
453
    
454
    if(s->bitstream_buffer_size && buf_size<20){ //divx 5.01+ frame reorder
455
        init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
456
    }else
457
        init_get_bits(&s->gb, buf, buf_size*8);
458
    s->bitstream_buffer_size=0;
459

    
460
    if (!s->context_initialized) {
461
        if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
462
            return -1;
463
    }
464
      
465
    /* let's go :-) */
466
    if (s->msmpeg4_version==5) {
467
        ret= ff_wmv2_decode_picture_header(s);
468
    } else if (s->msmpeg4_version) {
469
        ret = msmpeg4_decode_picture_header(s);
470
    } else if (s->h263_pred) {
471
        if(s->avctx->extradata_size && s->picture_number==0){
472
            GetBitContext gb;
473
            
474
            init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
475
            ret = ff_mpeg4_decode_picture_header(s, &gb);
476
        }
477
        ret = ff_mpeg4_decode_picture_header(s, &s->gb);
478

    
479
        if(s->flags& CODEC_FLAG_LOW_DELAY)
480
            s->low_delay=1;
481
    } else if (s->h263_intel) {
482
        ret = intel_h263_decode_picture_header(s);
483
    } else {
484
        ret = h263_decode_picture_header(s);
485
    }
486
    avctx->has_b_frames= !s->low_delay;
487

    
488
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
489
        if(s->padding_bug_score > -2 && !s->data_partitioning && !s->resync_marker)
490
            s->workaround_bugs |=  FF_BUG_NO_PADDING;
491
        else
492
            s->workaround_bugs &= ~FF_BUG_NO_PADDING;
493

    
494
        if(s->avctx->codec_tag == ff_get_fourcc("XVIX")) 
495
            s->workaround_bugs|= FF_BUG_XVID_ILACE;
496
#if 0
497
        if(s->avctx->codec_tag == ff_get_fourcc("MP4S")) 
498
            s->workaround_bugs|= FF_BUG_AC_VLC;
499
        
500
        if(s->avctx->codec_tag == ff_get_fourcc("M4S2")) 
501
            s->workaround_bugs|= FF_BUG_AC_VLC;
502
#endif
503
        if(s->avctx->codec_tag == ff_get_fourcc("UMP4")){
504
            s->workaround_bugs|= FF_BUG_UMP4;
505
            s->workaround_bugs|= FF_BUG_AC_VLC;
506
        }
507

    
508
        if(s->divx_version){
509
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
510
        }
511

    
512
        if(s->divx_version>502){
513
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
514
        }
515

    
516
        if(s->avctx->codec_tag == ff_get_fourcc("XVID") && s->xvid_build==0)
517
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
518
        
519
        if(s->avctx->codec_tag == ff_get_fourcc("XVID") && s->xvid_build==0)
520
            s->padding_bug_score= 256*256*256*64;
521
        
522
        if(s->xvid_build && s->xvid_build<=3)
523
            s->padding_bug_score= 256*256*256*64;
524
        
525
        if(s->xvid_build && s->xvid_build<=1)
526
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
527

    
528
#define SET_QPEL_FUNC(postfix1, postfix2) \
529
    s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
530
    s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
531
    s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
532

    
533
        if(s->lavc_build && s->lavc_build<4653)
534
            s->workaround_bugs|= FF_BUG_STD_QPEL;
535
        
536
        if(s->lavc_build && s->lavc_build<4655)
537
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
538

    
539
        if(s->divx_version)
540
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
541
//printf("padding_bug_score: %d\n", s->padding_bug_score);
542
        if(s->divx_version==501 && s->divx_build==20020416)
543
            s->padding_bug_score= 256*256*256*64;
544

    
545
        if(s->divx_version>=500){
546
            s->workaround_bugs|= FF_BUG_EDGE;
547
        }
548

    
549
#if 0
550
        if(s->divx_version==500)
551
            s->padding_bug_score= 256*256*256*64;
552

553
        /* very ugly XVID padding bug detection FIXME/XXX solve this differently
554
         * lets hope this at least works
555
         */
556
        if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
557
           && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
558
            s->workaround_bugs|= FF_BUG_NO_PADDING;
559
        
560
        if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
561
            s->workaround_bugs|= FF_BUG_NO_PADDING;
562
#endif
563
    }
564
    
565
    if(s->workaround_bugs& FF_BUG_STD_QPEL){
566
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
567
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
568
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
569
        SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
570
        SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
571
        SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
572

    
573
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
574
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
575
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
576
        SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
577
        SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
578
        SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
579
    }
580

    
581
#if 0 // dump bits per frame / qp / complexity
582
{
583
    static FILE *f=NULL;
584
    if(!f) f=fopen("rate_qp_cplx.txt", "w");
585
    fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
586
}
587
#endif
588
       
589
        /* After H263 & mpeg4 header decode we have the height, width,*/
590
        /* and other parameters. So then we could init the picture   */
591
        /* FIXME: By the way H263 decoder is evolving it should have */
592
        /* an H263EncContext                                         */
593
    if(s->aspected_height)
594
        new_aspect= s->aspected_width*s->width / (float)(s->height*s->aspected_height);
595
    else
596
        new_aspect=0;
597
    
598
    if (   s->width != avctx->width || s->height != avctx->height 
599
        || ABS(new_aspect - avctx->aspect_ratio) > 0.001) {
600
        /* H.263 could change picture size any time */
601
        MPV_common_end(s);
602
    }
603
    if (!s->context_initialized) {
604
        avctx->width = s->width;
605
        avctx->height = s->height;
606
        avctx->aspect_ratio= new_aspect;
607

    
608
        goto retry;
609
    }
610

    
611
    if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
612
        s->gob_index = ff_h263_get_gob_height(s);
613

    
614
    if(ret==FRAME_SKIPED) return get_consumed_bytes(s, buf_size);
615
    /* skip if the header was thrashed */
616
    if (ret < 0){
617
        fprintf(stderr, "header damaged\n");
618
        return -1;
619
    }
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

    
684
        if(   buf_size - current_pos > 5 
685
           && buf_size - current_pos < BITSTREAM_BUFFER_SIZE){
686
            int i;
687
            int startcode_found=0;
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
            if(startcode_found){
695
                memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
696
                s->bitstream_buffer_size= buf_size - current_pos;
697
            }
698
        }
699
    }
700

    
701
    ff_er_frame_end(s);
702

    
703
    MPV_frame_end(s);
704

    
705
    if((avctx->debug&FF_DEBUG_VIS_MV) && s->last_picture_ptr){
706
        const int shift= 1 + s->quarter_sample;
707
        int mb_y;
708
        uint8_t *ptr= s->last_picture.data[0];
709
        s->low_delay=0; //needed to see the vectors without trashing the buffers
710

    
711
        for(mb_y=0; mb_y<s->mb_height; mb_y++){
712
            int mb_x;
713
            for(mb_x=0; mb_x<s->mb_width; mb_x++){
714
                const int mb_index= mb_x + mb_y*s->mb_stride;
715
                if(IS_8X8(s->current_picture.mb_type[mb_index])){
716
                    int i;
717
                    for(i=0; i<4; i++){
718
                        int sx= mb_x*16 + 4 + 8*(i&1);
719
                        int sy= mb_y*16 + 4 + 8*(i>>1);
720
                        int xy= 1 + mb_x*2 + (i&1) + (mb_y*2 + 1 + (i>>1))*(s->mb_width*2 + 2);
721
                        int mx= (s->motion_val[xy][0]>>shift) + sx;
722
                        int my= (s->motion_val[xy][1]>>shift) + sy;
723
                        draw_arrow(ptr, sx, sy, mx, my, s->width, s->height, s->linesize, 100);
724
                    }
725
                }else{
726
                    int sx= mb_x*16 + 8;
727
                    int sy= mb_y*16 + 8;
728
                    int xy= 1 + mb_x*2 + (mb_y*2 + 1)*(s->mb_width*2 + 2);
729
                    int mx= (s->motion_val[xy][0]>>shift) + sx;
730
                    int my= (s->motion_val[xy][1]>>shift) + sy;
731
                    draw_arrow(ptr, sx, sy, mx, my, s->width, s->height, s->linesize, 100);
732
                }
733
                s->mbskip_table[mb_index]=0;
734
            }
735
        }
736
    }
737

    
738
    if(s->pict_type==B_TYPE || s->low_delay){
739
        *pict= *(AVFrame*)&s->current_picture;
740
        ff_print_debug_info(s, s->current_picture_ptr);
741
    } else {
742
        *pict= *(AVFrame*)&s->last_picture;
743
        ff_print_debug_info(s, s->last_picture_ptr);
744
    }
745

    
746
    /* Return the Picture timestamp as the frame number */
747
    /* we substract 1 because it is added on utils.c    */
748
    avctx->frame_number = s->picture_number - 1;
749

    
750
    /* dont output the last pic after seeking */
751
    if(s->last_picture_ptr || s->low_delay)
752
        *data_size = sizeof(AVFrame);
753
#ifdef PRINT_FRAME_TIME
754
printf("%Ld\n", rdtsc()-time);
755
#endif
756
    return get_consumed_bytes(s, buf_size);
757
}
758

    
759
static const AVOption mpeg4_decoptions[] =
760
{
761
    AVOPTION_SUB(avoptions_workaround_bug),
762
    AVOPTION_END()
763
};
764

    
765
AVCodec mpeg4_decoder = {
766
    "mpeg4",
767
    CODEC_TYPE_VIDEO,
768
    CODEC_ID_MPEG4,
769
    sizeof(MpegEncContext),
770
    ff_h263_decode_init,
771
    NULL,
772
    ff_h263_decode_end,
773
    ff_h263_decode_frame,
774
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
775
    .options = mpeg4_decoptions,
776
};
777

    
778
AVCodec h263_decoder = {
779
    "h263",
780
    CODEC_TYPE_VIDEO,
781
    CODEC_ID_H263,
782
    sizeof(MpegEncContext),
783
    ff_h263_decode_init,
784
    NULL,
785
    ff_h263_decode_end,
786
    ff_h263_decode_frame,
787
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
788
};
789

    
790
AVCodec msmpeg4v1_decoder = {
791
    "msmpeg4v1",
792
    CODEC_TYPE_VIDEO,
793
    CODEC_ID_MSMPEG4V1,
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,
800
    mpeg4_decoptions,
801
};
802

    
803
AVCodec msmpeg4v2_decoder = {
804
    "msmpeg4v2",
805
    CODEC_TYPE_VIDEO,
806
    CODEC_ID_MSMPEG4V2,
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 msmpeg4v3_decoder = {
817
    "msmpeg4",
818
    CODEC_TYPE_VIDEO,
819
    CODEC_ID_MSMPEG4V3,
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
    .options = mpeg4_decoptions,
827
};
828

    
829
AVCodec wmv1_decoder = {
830
    "wmv1",
831
    CODEC_TYPE_VIDEO,
832
    CODEC_ID_WMV1,
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
    mpeg4_decoptions,
840
};
841

    
842
AVCodec h263i_decoder = {
843
    "h263i",
844
    CODEC_TYPE_VIDEO,
845
    CODEC_ID_H263I,
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