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ffmpeg / libavcodec / h263dec.c @ bec89a84

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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_version>=500){
132
        //we would have to scan through the whole buf to handle the weird reordering ...
133
        return buf_size; 
134
    }else if(s->flags&CODEC_FLAG_TRUNCATED){
135
        pos -= s->parse_context.last_index;
136
        if(pos<0) pos=0; // padding is not really read so this might be -1
137
        return pos;
138
    }else{
139
        if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
140
        if(pos+10>buf_size) pos=buf_size; // oops ;)
141

    
142
        return pos;
143
    }
144
}
145

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

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

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

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

    
193
            ff_update_block_index(s);
194

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

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

    
210
            if(ret<0){
211
                const int xy= s->mb_x + s->mb_y*s->mb_width;
212
                if(ret==SLICE_END){
213
//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));
214
                    s->error_status_table[xy]|= AC_END;
215
                    if(!s->partitioned_frame)
216
                        s->error_status_table[xy]|= MV_END|DC_END;
217

    
218
                    s->padding_bug_score--;
219
                        
220
                    if(++s->mb_x >= s->mb_width){
221
                        s->mb_x=0;
222
                        ff_draw_horiz_band(s, s->mb_y*16, 16);
223
                        s->mb_y++;
224
                    }
225
                    return 0; 
226
                }else if(ret==SLICE_NOEND){
227
                    fprintf(stderr,"Slice mismatch at MB: %d\n", xy);
228
                    return -1;
229
                }
230
                fprintf(stderr,"Error at MB: %d\n", xy);
231
                s->error_status_table[xy]|= AC_ERROR;
232
                if(!s->partitioned_frame)
233
                    s->error_status_table[xy]|= DC_ERROR|MV_ERROR;
234
    
235
                return -1;
236
            }
237
        }
238
        
239
        ff_draw_horiz_band(s, s->mb_y*16, 16);
240
        
241
        s->mb_x= 0;
242
    }
243
    
244
    assert(s->mb_x==0 && s->mb_y==s->mb_height);
245

    
246
    /* try to detect the padding bug */
247
    if(      s->codec_id==CODEC_ID_MPEG4
248
       &&   (s->workaround_bugs&FF_BUG_AUTODETECT) 
249
       &&    s->gb.size_in_bits - get_bits_count(&s->gb) >=0
250
       &&    s->gb.size_in_bits - get_bits_count(&s->gb) < 48
251
//       &&   !s->resync_marker
252
       &&   !s->data_partitioning){
253
        
254
        const int bits_count= get_bits_count(&s->gb);
255
        const int bits_left = s->gb.size_in_bits - bits_count;
256
        
257
        if(bits_left==0){
258
            s->padding_bug_score+=16;
259
        }else if(bits_left>8){
260
            s->padding_bug_score++;
261
        } else if(bits_left != 1){
262
            int v= show_bits(&s->gb, 8);
263
            v|= 0x7F >> (7-(bits_count&7));
264

    
265
            if(v==0x7F)
266
                s->padding_bug_score--;
267
            else
268
                s->padding_bug_score++;            
269
        }                          
270
    }
271

    
272
    // handle formats which dont have unique end markers
273
    if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
274
        int left= s->gb.size_in_bits - get_bits_count(&s->gb);
275
        int max_extra=7;
276
        
277
        /* no markers in M$ crap */
278
        if(s->msmpeg4_version && s->pict_type==I_TYPE)
279
            max_extra+= 17;
280
        
281
        /* buggy padding but the frame should still end approximately at the bitstream end */
282
        if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_resilience>=3)
283
            max_extra+= 48;
284
        else if((s->workaround_bugs&FF_BUG_NO_PADDING))
285
            max_extra+= 256*256*256*64;
286
        
287
        if(left>max_extra){
288
            fprintf(stderr, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
289
        }
290
        else if(left<0){
291
            fprintf(stderr, "overreading %d bits\n", -left);
292
        }else
293
            s->error_status_table[s->mb_num-1]|= AC_END|MV_END|DC_END;
294
        
295
        return 0;
296
    }
297

    
298
    fprintf(stderr, "slice end not reached but screenspace end (%d left %06X)\n", 
299
            s->gb.size_in_bits - get_bits_count(&s->gb),
300
            show_bits(&s->gb, 24));
301
    return -1;
302
}
303

    
304
/**
305
 * finds the end of the current frame in the bitstream.
306
 * @return the position of the first byte of the next frame, or -1
307
 */
308
static int mpeg4_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
309
    ParseContext *pc= &s->parse_context;
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
    for(; i<buf_size; i++){
329
        state= (state<<8) | buf[i];
330
        if((state&0xFFFFFF00) == 0x100){
331
            pc->frame_start_found=0;
332
            pc->state=-1; 
333
            return i-3;
334
        }
335
    }
336
    pc->frame_start_found= vop_found;
337
    pc->state= state;
338
    return -1;
339
}
340

    
341
/**
342
 * draws an line from (ex, ey) -> (sx, sy).
343
 * @param w width of the image
344
 * @param h height of the image
345
 * @param stride stride/linesize of the image
346
 * @param color color of the arrow
347
 */
348
static void draw_line(uint8_t *buf, int sx, int sy, int ex, int ey, int w, int h, int stride, int color){
349
    int t, x, y, f;
350
    
351
    ex= clip(ex, 0, w-1);
352
    ey= clip(ey, 0, h-1);
353
    
354
    buf[sy*stride + sx]+= color;
355
    
356
    if(ABS(ex - sx) > ABS(ey - sy)){
357
        if(sx > ex){
358
            t=sx; sx=ex; ex=t;
359
            t=sy; sy=ey; ey=t;
360
        }
361
        buf+= sx + sy*stride;
362
        ex-= sx;
363
        f= ((ey-sy)<<16)/ex;
364
        for(x= 0; x <= ex; x++){
365
            y= ((x*f) + (1<<15))>>16;
366
            buf[y*stride + x]+= color;
367
        }
368
    }else{
369
        if(sy > ey){
370
            t=sx; sx=ex; ex=t;
371
            t=sy; sy=ey; ey=t;
372
        }
373
        buf+= sx + sy*stride;
374
        ey-= sy;
375
        if(ey) f= ((ex-sx)<<16)/ey;
376
        else   f= 0;
377
        for(y= 0; y <= ey; y++){
378
            x= ((y*f) + (1<<15))>>16;
379
            buf[y*stride + x]+= color;
380
        }
381
    }
382
}
383

    
384
/**
385
 * draws an arrow from (ex, ey) -> (sx, sy).
386
 * @param w width of the image
387
 * @param h height of the image
388
 * @param stride stride/linesize of the image
389
 * @param color color of the arrow
390
 */
391
static void draw_arrow(uint8_t *buf, int sx, int sy, int ex, int ey, int w, int h, int stride, int color){ 
392
    int dx= ex - sx;
393
    int dy= ey - sy;
394
    
395
    if(dx*dx + dy*dy > 3*3){
396
        int rx=  dx + dy;
397
        int ry= -dx + dy;
398
        int length= ff_sqrt((rx*rx + ry*ry)<<8);
399
        
400
        //FIXME subpixel accuracy
401
        rx= ROUNDED_DIV(rx*3<<4, length);
402
        ry= ROUNDED_DIV(ry*3<<4, length);
403
        
404
        draw_line(buf, sx, sy, sx + rx, sy + ry, w, h, stride, color);
405
        draw_line(buf, sx, sy, sx - ry, sy + rx, w, h, stride, color);
406
    }
407
    draw_line(buf, sx, sy, ex, ey, w, h, stride, color);
408
}
409

    
410
int ff_h263_decode_frame(AVCodecContext *avctx, 
411
                             void *data, int *data_size,
412
                             uint8_t *buf, int buf_size)
413
{
414
    MpegEncContext *s = avctx->priv_data;
415
    int ret,i;
416
    AVFrame *pict = data; 
417
    float new_aspect;
418
    
419
#ifdef PRINT_FRAME_TIME
420
uint64_t time= rdtsc();
421
#endif
422
#ifdef DEBUG
423
    printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
424
    printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
425
#endif
426
    s->flags= avctx->flags;
427

    
428
    *data_size = 0;
429
   
430
   /* no supplementary picture */
431
    if (buf_size == 0) {
432
        return 0;
433
    }
434

    
435
    if(s->flags&CODEC_FLAG_TRUNCATED){
436
        int next;
437
        
438
        if(s->codec_id==CODEC_ID_MPEG4){
439
            next= mpeg4_find_frame_end(s, buf, buf_size);
440
        }else{
441
            fprintf(stderr, "this codec doesnt support truncated bitstreams\n");
442
            return -1;
443
        }
444
        
445
        if( ff_combine_frame(s, next, &buf, &buf_size) < 0 )
446
            return buf_size;
447
    }
448

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

    
457
    if (!s->context_initialized) {
458
        if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
459
            return -1;
460
    }
461
      
462
    /* let's go :-) */
463
    if (s->msmpeg4_version==5) {
464
        ret= ff_wmv2_decode_picture_header(s);
465
    } else if (s->msmpeg4_version) {
466
        ret = msmpeg4_decode_picture_header(s);
467
    } else if (s->h263_pred) {
468
        if(s->avctx->extradata_size && s->picture_number==0){
469
            GetBitContext gb;
470
            
471
            init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
472
            ret = ff_mpeg4_decode_picture_header(s, &gb);
473
        }
474
        ret = ff_mpeg4_decode_picture_header(s, &s->gb);
475

    
476
        if(s->flags& CODEC_FLAG_LOW_DELAY)
477
            s->low_delay=1;
478
    } else if (s->h263_intel) {
479
        ret = intel_h263_decode_picture_header(s);
480
    } else {
481
        ret = h263_decode_picture_header(s);
482
    }
483
    avctx->has_b_frames= !s->low_delay;
484

    
485
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
486
        if(s->padding_bug_score > -2 && !s->data_partitioning)
487
            s->workaround_bugs |=  FF_BUG_NO_PADDING;
488
        else
489
            s->workaround_bugs &= ~FF_BUG_NO_PADDING;
490

    
491
        if(s->avctx->fourcc == ff_get_fourcc("XVIX")) 
492
            s->workaround_bugs|= FF_BUG_XVID_ILACE;
493
#if 0
494
        if(s->avctx->fourcc == ff_get_fourcc("MP4S")) 
495
            s->workaround_bugs|= FF_BUG_AC_VLC;
496
        
497
        if(s->avctx->fourcc == ff_get_fourcc("M4S2")) 
498
            s->workaround_bugs|= FF_BUG_AC_VLC;
499
#endif
500
        if(s->avctx->fourcc == ff_get_fourcc("UMP4")){
501
            s->workaround_bugs|= FF_BUG_UMP4;
502
            s->workaround_bugs|= FF_BUG_AC_VLC;
503
        }
504

    
505
        if(s->divx_version){
506
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
507
        }
508

    
509
        if(s->divx_version>502){
510
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
511
        }
512

    
513
        if(s->avctx->fourcc == ff_get_fourcc("XVID") && s->xvid_build==0)
514
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
515
        
516
        if(s->avctx->fourcc == ff_get_fourcc("XVID") && s->xvid_build==0)
517
            s->padding_bug_score= 256*256*256*64;
518
        
519
        if(s->xvid_build && s->xvid_build<=3)
520
            s->padding_bug_score= 256*256*256*64;
521
        
522
        if(s->xvid_build && s->xvid_build<=1)
523
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
524

    
525
#define SET_QPEL_FUNC(postfix1, postfix2) \
526
    s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
527
    s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
528
    s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
529

    
530
        if(s->lavc_build && s->lavc_build<4653)
531
            s->workaround_bugs|= FF_BUG_STD_QPEL;
532
        
533
        if(s->lavc_build && s->lavc_build<4655)
534
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
535

    
536
        if(s->divx_version)
537
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
538
//printf("padding_bug_score: %d\n", s->padding_bug_score);
539
        if(s->divx_version==501 && s->divx_build==20020416)
540
            s->padding_bug_score= 256*256*256*64;
541
#if 0
542
        if(s->divx_version==500)
543
            s->padding_bug_score= 256*256*256*64;
544

545
        /* very ugly XVID padding bug detection FIXME/XXX solve this differently
546
         * lets hope this at least works
547
         */
548
        if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
549
           && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
550
            s->workaround_bugs|= FF_BUG_NO_PADDING;
551
        
552
        if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
553
            s->workaround_bugs|= FF_BUG_NO_PADDING;
554
#endif
555
    }
556
    
557
    if(s->workaround_bugs& FF_BUG_STD_QPEL){
558
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
559
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
560
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
561
        SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
562
        SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
563
        SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
564

    
565
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
566
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
567
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
568
        SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
569
        SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
570
        SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
571
    }
572

    
573
#if 0 // dump bits per frame / qp / complexity
574
{
575
    static FILE *f=NULL;
576
    if(!f) f=fopen("rate_qp_cplx.txt", "w");
577
    fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
578
}
579
#endif
580
       
581
        /* After H263 & mpeg4 header decode we have the height, width,*/
582
        /* and other parameters. So then we could init the picture   */
583
        /* FIXME: By the way H263 decoder is evolving it should have */
584
        /* an H263EncContext                                         */
585
    if(s->aspected_height)
586
        new_aspect= s->aspected_width*s->width / (float)(s->height*s->aspected_height);
587
    else
588
        new_aspect=0;
589
    
590
    if (   s->width != avctx->width || s->height != avctx->height 
591
        || ABS(new_aspect - avctx->aspect_ratio) > 0.001) {
592
        /* H.263 could change picture size any time */
593
        MPV_common_end(s);
594
        s->context_initialized=0;
595
    }
596
    if (!s->context_initialized) {
597
        avctx->width = s->width;
598
        avctx->height = s->height;
599
        avctx->aspect_ratio= new_aspect;
600

    
601
        goto retry;
602
    }
603

    
604
    if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
605
        s->gob_index = ff_h263_get_gob_height(s);
606

    
607
    if(ret==FRAME_SKIPED) return get_consumed_bytes(s, buf_size);
608
    /* skip if the header was thrashed */
609
    if (ret < 0){
610
        fprintf(stderr, "header damaged\n");
611
        return -1;
612
    }
613
    
614
    // for hurry_up==5
615
    s->current_picture.pict_type= s->pict_type;
616
    s->current_picture.key_frame= s->pict_type == I_TYPE;
617

    
618
    /* skip b frames if we dont have reference frames */
619
    if(s->last_picture.data[0]==NULL && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
620
    /* skip b frames if we are in a hurry */
621
    if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
622
    /* skip everything if we are in a hurry>=5 */
623
    if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
624
    
625
    if(s->next_p_frame_damaged){
626
        if(s->pict_type==B_TYPE)
627
            return get_consumed_bytes(s, buf_size);
628
        else
629
            s->next_p_frame_damaged=0;
630
    }
631

    
632
    if(MPV_frame_start(s, avctx) < 0)
633
        return -1;
634

    
635
#ifdef DEBUG
636
    printf("qscale=%d\n", s->qscale);
637
#endif
638

    
639
    if(s->error_resilience)
640
        memset(s->error_status_table, MV_ERROR|AC_ERROR|DC_ERROR|VP_START|AC_END|DC_END|MV_END, s->mb_num*sizeof(uint8_t));
641
    
642
    /* decode each macroblock */
643
    s->block_wrap[0]=
644
    s->block_wrap[1]=
645
    s->block_wrap[2]=
646
    s->block_wrap[3]= s->mb_width*2 + 2;
647
    s->block_wrap[4]=
648
    s->block_wrap[5]= s->mb_width + 2;
649
    s->mb_x=0; 
650
    s->mb_y=0;
651
    
652
    decode_slice(s);
653
    s->error_status_table[0]|= VP_START;
654
    while(s->mb_y<s->mb_height && s->gb.size_in_bits - get_bits_count(&s->gb)>16){
655
        if(s->msmpeg4_version){
656
            if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0)
657
                break;
658
        }else{
659
            if(ff_h263_resync(s)<0)
660
                break;
661
        }
662
        
663
        if(s->msmpeg4_version<4 && s->h263_pred)
664
            ff_mpeg4_clean_buffers(s);
665

    
666
        decode_slice(s);
667

    
668
        s->error_status_table[s->resync_mb_x + s->resync_mb_y*s->mb_width]|= VP_START;
669
    }
670

    
671
    if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
672
        if(msmpeg4_decode_ext_header(s, buf_size) < 0){
673
            s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
674
        }
675
    
676
    /* divx 5.01+ bistream reorder stuff */
677
    if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_version>=500){
678
        int current_pos= get_bits_count(&s->gb)>>3;
679

    
680
        if(   buf_size - current_pos > 5 
681
           && buf_size - current_pos < BITSTREAM_BUFFER_SIZE){
682
            int i;
683
            int startcode_found=0;
684
            for(i=current_pos; i<buf_size-3; i++){
685
                if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
686
                    startcode_found=1;
687
                    break;
688
                }
689
            }
690
            if(startcode_found){
691
                memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
692
                s->bitstream_buffer_size= buf_size - current_pos;
693
            }
694
        }
695
    }
696

    
697
    if(s->error_resilience){
698
        int error=0, num_end_markers=0;
699
        for(i=0; i<s->mb_num; i++){
700
            int status= s->error_status_table[i];
701
#if 0
702
            if(i%s->mb_width == 0) printf("\n");
703
            printf("%2X ", status); 
704
#endif
705
            if(status==0) continue;
706

    
707
            if(status&(DC_ERROR|AC_ERROR|MV_ERROR))
708
                error=1;
709
            if(status&VP_START){
710
                if(num_end_markers) 
711
                    error=1;
712
                num_end_markers=3;
713
            }
714
            if(status&AC_END)
715
                num_end_markers--;
716
            if(status&DC_END)
717
                num_end_markers--;
718
            if(status&MV_END)
719
                num_end_markers--;
720
        }
721
        if(num_end_markers || error){
722
            fprintf(stderr, "concealing errors\n");
723
            ff_error_resilience(s);
724
        }
725
    }
726

    
727
    MPV_frame_end(s);
728

    
729
    if((avctx->debug&FF_DEBUG_VIS_MV) && s->last_picture.data[0]){
730
        const int shift= 1 + s->quarter_sample;
731
        int mb_y;
732
        uint8_t *ptr= s->last_picture.data[0];
733
        s->low_delay=0; //needed to see the vectors without trashing the buffers
734

    
735
        for(mb_y=0; mb_y<s->mb_height; mb_y++){
736
            int mb_x;
737
            for(mb_x=0; mb_x<s->mb_width; mb_x++){
738
                const int mb_index= mb_x + mb_y*s->mb_width;
739
                if(s->co_located_type_table[mb_index] == MV_TYPE_8X8){
740
                    int i;
741
                    for(i=0; i<4; i++){
742
                        int sx= mb_x*16 + 4 + 8*(i&1);
743
                        int sy= mb_y*16 + 4 + 8*(i>>1);
744
                        int xy= 1 + mb_x*2 + (i&1) + (mb_y*2 + 1 + (i>>1))*(s->mb_width*2 + 2);
745
                        int mx= (s->motion_val[xy][0]>>shift) + sx;
746
                        int my= (s->motion_val[xy][1]>>shift) + sy;
747
                        draw_arrow(ptr, sx, sy, mx, my, s->width, s->height, s->linesize, 100);
748
                    }
749
                }else{
750
                    int sx= mb_x*16 + 8;
751
                    int sy= mb_y*16 + 8;
752
                    int xy= 1 + mb_x*2 + (mb_y*2 + 1)*(s->mb_width*2 + 2);
753
                    int mx= (s->motion_val[xy][0]>>shift) + sx;
754
                    int my= (s->motion_val[xy][1]>>shift) + sy;
755
                    draw_arrow(ptr, sx, sy, mx, my, s->width, s->height, s->linesize, 100);
756
                }
757
                s->mbskip_table[mb_index]=0;
758
            }
759
        }
760
    }
761

    
762

    
763
    if(s->pict_type==B_TYPE || s->low_delay){
764
        *pict= *(AVFrame*)&s->current_picture;
765
    } else {
766
        *pict= *(AVFrame*)&s->last_picture;
767
    }
768

    
769
    if(avctx->debug&FF_DEBUG_QP){
770
        int8_t *qtab= pict->qscale_table;
771
        int x,y;
772
        
773
        for(y=0; y<s->mb_height; y++){
774
            for(x=0; x<s->mb_width; x++){
775
                printf("%2d ", qtab[x + y*s->mb_width]);
776
            }
777
            printf("\n");
778
        }
779
        printf("\n");
780
    }
781

    
782
    /* Return the Picture timestamp as the frame number */
783
    /* we substract 1 because it is added on utils.c    */
784
    avctx->frame_number = s->picture_number - 1;
785

    
786
    /* dont output the last pic after seeking */
787
    if(s->last_picture.data[0] || s->low_delay)
788
        *data_size = sizeof(AVFrame);
789
#ifdef PRINT_FRAME_TIME
790
printf("%Ld\n", rdtsc()-time);
791
#endif
792
    return get_consumed_bytes(s, buf_size);
793
}
794

    
795
AVCodec mpeg4_decoder = {
796
    "mpeg4",
797
    CODEC_TYPE_VIDEO,
798
    CODEC_ID_MPEG4,
799
    sizeof(MpegEncContext),
800
    ff_h263_decode_init,
801
    NULL,
802
    ff_h263_decode_end,
803
    ff_h263_decode_frame,
804
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
805
};
806

    
807
AVCodec h263_decoder = {
808
    "h263",
809
    CODEC_TYPE_VIDEO,
810
    CODEC_ID_H263,
811
    sizeof(MpegEncContext),
812
    ff_h263_decode_init,
813
    NULL,
814
    ff_h263_decode_end,
815
    ff_h263_decode_frame,
816
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
817
};
818

    
819
AVCodec msmpeg4v1_decoder = {
820
    "msmpeg4v1",
821
    CODEC_TYPE_VIDEO,
822
    CODEC_ID_MSMPEG4V1,
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
};
830

    
831
AVCodec msmpeg4v2_decoder = {
832
    "msmpeg4v2",
833
    CODEC_TYPE_VIDEO,
834
    CODEC_ID_MSMPEG4V2,
835
    sizeof(MpegEncContext),
836
    ff_h263_decode_init,
837
    NULL,
838
    ff_h263_decode_end,
839
    ff_h263_decode_frame,
840
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
841
};
842

    
843
AVCodec msmpeg4v3_decoder = {
844
    "msmpeg4",
845
    CODEC_TYPE_VIDEO,
846
    CODEC_ID_MSMPEG4V3,
847
    sizeof(MpegEncContext),
848
    ff_h263_decode_init,
849
    NULL,
850
    ff_h263_decode_end,
851
    ff_h263_decode_frame,
852
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
853
};
854

    
855
AVCodec wmv1_decoder = {
856
    "wmv1",
857
    CODEC_TYPE_VIDEO,
858
    CODEC_ID_WMV1,
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
};
866

    
867
AVCodec h263i_decoder = {
868
    "h263i",
869
    CODEC_TYPE_VIDEO,
870
    CODEC_ID_H263I,
871
    sizeof(MpegEncContext),
872
    ff_h263_decode_init,
873
    NULL,
874
    ff_h263_decode_end,
875
    ff_h263_decode_frame,
876
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
877
};
878