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ffmpeg / libavcodec / h263dec.c @ c40c3482

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1
/*
2
 * H263 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
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18
 */
19
#include "avcodec.h"
20
#include "dsputil.h"
21
#include "mpegvideo.h"
22

    
23
//#define DEBUG
24
//#define PRINT_FRAME_TIME
25
#ifdef PRINT_FRAME_TIME
26
static inline long long rdtsc()
27
{
28
        long long l;
29
        asm volatile(        "rdtsc\n\t"
30
                : "=A" (l)
31
        );
32
//        printf("%d\n", int(l/1000));
33
        return l;
34
}
35
#endif
36

    
37
int ff_h263_decode_init(AVCodecContext *avctx)
38
{
39
    MpegEncContext *s = avctx->priv_data;
40

    
41
    s->avctx = avctx;
42
    s->out_format = FMT_H263;
43

    
44
    s->width = avctx->width;
45
    s->height = avctx->height;
46
    s->workaround_bugs= avctx->workaround_bugs;
47

    
48
    // set defaults
49
    s->quant_precision=5;
50
    s->progressive_sequence=1;
51
    s->decode_mb= ff_h263_decode_mb;
52
    s->low_delay= 1;
53
    avctx->pix_fmt= PIX_FMT_YUV420P;
54

    
55
    /* select sub codec */
56
    switch(avctx->codec->id) {
57
    case CODEC_ID_H263:
58
        s->gob_number = 0;
59
        break;
60
    case CODEC_ID_MPEG4:
61
        s->time_increment_bits = 4; /* default value for broken headers */
62
        s->h263_pred = 1;
63
        s->low_delay = 0; //default, might be overriden in the vol header during header parsing
64
        break;
65
    case CODEC_ID_MSMPEG4V1:
66
        s->h263_msmpeg4 = 1;
67
        s->h263_pred = 1;
68
        s->msmpeg4_version=1;
69
        break;
70
    case CODEC_ID_MSMPEG4V2:
71
        s->h263_msmpeg4 = 1;
72
        s->h263_pred = 1;
73
        s->msmpeg4_version=2;
74
        break;
75
    case CODEC_ID_MSMPEG4V3:
76
        s->h263_msmpeg4 = 1;
77
        s->h263_pred = 1;
78
        s->msmpeg4_version=3;
79
        break;
80
    case CODEC_ID_WMV1:
81
        s->h263_msmpeg4 = 1;
82
        s->h263_pred = 1;
83
        s->msmpeg4_version=4;
84
        break;
85
    case CODEC_ID_WMV2:
86
        s->h263_msmpeg4 = 1;
87
        s->h263_pred = 1;
88
        s->msmpeg4_version=5;
89
        break;
90
    case CODEC_ID_H263I:
91
        s->h263_intel = 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_version>=500){
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
    s->last_resync_gb= s->gb;
142
    s->first_slice_line= 1;
143
        
144
    s->resync_mb_x= s->mb_x;
145
    s->resync_mb_y= s->mb_y;
146

    
147
    s->y_dc_scale= s->y_dc_scale_table[ s->qscale ];
148
    s->c_dc_scale= s->c_dc_scale_table[ 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 where modified */
159
        s->first_slice_line=1;
160
        s->mb_x= s->resync_mb_x;
161
        s->mb_y= s->resync_mb_y;
162
        s->qscale= qscale;
163
        s->y_dc_scale= s->y_dc_scale_table[ s->qscale ];
164
        s->c_dc_scale= s->c_dc_scale_table[ s->qscale ];
165
    }
166

    
167
    for(; s->mb_y < s->mb_height; s->mb_y++) {
168
        /* per-row end of slice checks */
169
        if(s->msmpeg4_version){
170
            if(s->resync_mb_y + s->slice_height == s->mb_y){
171
                const int xy= s->mb_x + s->mb_y*s->mb_width;
172
                s->error_status_table[xy-1]|= AC_END|DC_END|MV_END;
173
                return 0;
174
            }
175
        }
176
        
177
        if(s->msmpeg4_version==1){
178
            s->last_dc[0]=
179
            s->last_dc[1]=
180
            s->last_dc[2]= 128;
181
        }
182
    
183
        ff_init_block_index(s);
184
        for(; s->mb_x < s->mb_width; s->mb_x++) {
185
            int ret;
186

    
187
            ff_update_block_index(s);
188

    
189
            if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
190
                s->first_slice_line=0; 
191
            }
192

    
193
            /* DCT & quantize */
194
            s->dsp.clear_blocks(s->block[0]);
195
            
196
            s->mv_dir = MV_DIR_FORWARD;
197
            s->mv_type = MV_TYPE_16X16;
198
//            s->mb_skiped = 0;
199
//printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
200
            ret= s->decode_mb(s, s->block);
201
            
202
            MPV_decode_mb(s, s->block);
203

    
204
            if(ret<0){
205
                const int xy= s->mb_x + s->mb_y*s->mb_width;
206
                if(ret==SLICE_END){
207
//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));
208
                    s->error_status_table[xy]|= AC_END;
209
                    if(!s->partitioned_frame)
210
                        s->error_status_table[xy]|= MV_END|DC_END;
211

    
212
                    s->padding_bug_score--;
213
                        
214
                    if(++s->mb_x >= s->mb_width){
215
                        s->mb_x=0;
216
                        ff_draw_horiz_band(s);
217
                        s->mb_y++;
218
                    }
219
                    return 0; 
220
                }else if(ret==SLICE_NOEND){
221
                    fprintf(stderr,"Slice mismatch at MB: %d\n", xy);
222
                    return -1;
223
                }
224
                fprintf(stderr,"Error at MB: %d\n", xy);
225
                s->error_status_table[xy]|= AC_ERROR;
226
                if(!s->partitioned_frame)
227
                    s->error_status_table[xy]|= DC_ERROR|MV_ERROR;
228
    
229
                return -1;
230
            }
231
        }
232
        
233
        ff_draw_horiz_band(s);
234
        
235
        s->mb_x= 0;
236
    }
237
    
238
    assert(s->mb_x==0 && s->mb_y==s->mb_height);
239

    
240
    /* try to detect the padding bug */
241
    if(      s->codec_id==CODEC_ID_MPEG4
242
       &&   (s->workaround_bugs&FF_BUG_AUTODETECT) 
243
       &&    s->gb.size_in_bits - get_bits_count(&s->gb) >=0
244
       &&    s->gb.size_in_bits - get_bits_count(&s->gb) < 48
245
//       &&   !s->resync_marker
246
       &&   !s->data_partitioning){
247
        
248
        const int bits_count= get_bits_count(&s->gb);
249
        const int bits_left = s->gb.size_in_bits - bits_count;
250
        
251
        if(bits_left==0){
252
            s->padding_bug_score+=16;
253
        }else if(bits_left>8){
254
            s->padding_bug_score++;
255
        } else if(bits_left != 1){
256
            int v= show_bits(&s->gb, 8);
257
            v|= 0x7F >> (7-(bits_count&7));
258

    
259
            if(v==0x7F)
260
                s->padding_bug_score--;
261
            else
262
                s->padding_bug_score++;            
263
        }                          
264
    }
265

    
266
    // handle formats which dont have unique end markers
267
    if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
268
        int left= s->gb.size_in_bits - get_bits_count(&s->gb);
269
        int max_extra=7;
270
        
271
        /* no markers in M$ crap */
272
        if(s->msmpeg4_version && s->pict_type==I_TYPE)
273
            max_extra+= 17;
274
        
275
        /* buggy padding but the frame should still end approximately at the bitstream end */
276
        if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_resilience>=3)
277
            max_extra+= 48;
278
        else if((s->workaround_bugs&FF_BUG_NO_PADDING))
279
            max_extra+= 256*256*256*64;
280
        
281
        if(left>max_extra){
282
            fprintf(stderr, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
283
        }
284
        else if(left<0){
285
            fprintf(stderr, "overreading %d bits\n", -left);
286
        }else
287
            s->error_status_table[s->mb_num-1]|= AC_END|MV_END|DC_END;
288
        
289
        return 0;
290
    }
291

    
292
    fprintf(stderr, "slice end not reached but screenspace end (%d left %06X)\n", 
293
            s->gb.size_in_bits - get_bits_count(&s->gb),
294
            show_bits(&s->gb, 24));
295
    return -1;
296
}
297

    
298
/**
299
 * finds the end of the current frame in the bitstream.
300
 * @return the position of the first byte of the next frame, or -1
301
 */
302
static int mpeg4_find_frame_end(MpegEncContext *s, UINT8 *buf, int buf_size){
303
    ParseContext *pc= &s->parse_context;
304
    int vop_found, i;
305
    uint32_t state;
306
    
307
    vop_found= pc->frame_start_found;
308
    state= pc->state;
309
    
310
    i=0;
311
    if(!vop_found){
312
        for(i=0; i<buf_size; i++){
313
            state= (state<<8) | buf[i];
314
            if(state == 0x1B6){
315
                i++;
316
                vop_found=1;
317
                break;
318
            }
319
        }
320
    }
321
    
322
    for(; i<buf_size; i++){
323
        state= (state<<8) | buf[i];
324
        if((state&0xFFFFFF00) == 0x100){
325
            pc->frame_start_found=0;
326
            pc->state=-1; 
327
            return i-3;
328
        }
329
    }
330
    pc->frame_start_found= vop_found;
331
    pc->state= state;
332
    return -1;
333
}
334

    
335
/**
336
 * draws an line from (ex, ey) -> (sx, sy).
337
 * @param w width of the image
338
 * @param h height of the image
339
 * @param stride stride/linesize of the image
340
 * @param color color of the arrow
341
 */
342
static void draw_line(uint8_t *buf, int sx, int sy, int ex, int ey, int w, int h, int stride, int color){
343
    int t, x, y, f;
344
    
345
    ex= clip(ex, 0, w-1);
346
    ey= clip(ey, 0, h-1);
347
    
348
    buf[sy*stride + sx]+= color;
349
    
350
    if(ABS(ex - sx) > ABS(ey - sy)){
351
        if(sx > ex){
352
            t=sx; sx=ex; ex=t;
353
            t=sy; sy=ey; ey=t;
354
        }
355
        buf+= sx + sy*stride;
356
        ex-= sx;
357
        f= ((ey-sy)<<16)/ex;
358
        for(x= 0; x <= ex; x++){
359
            y= ((x*f) + (1<<15))>>16;
360
            buf[y*stride + x]+= color;
361
        }
362
    }else{
363
        if(sy > ey){
364
            t=sx; sx=ex; ex=t;
365
            t=sy; sy=ey; ey=t;
366
        }
367
        buf+= sx + sy*stride;
368
        ey-= sy;
369
        if(ey) f= ((ex-sx)<<16)/ey;
370
        else   f= 0;
371
        for(y= 0; y <= ey; y++){
372
            x= ((y*f) + (1<<15))>>16;
373
            buf[y*stride + x]+= color;
374
        }
375
    }
376
}
377

    
378
/**
379
 * draws an arrow from (ex, ey) -> (sx, sy).
380
 * @param w width of the image
381
 * @param h height of the image
382
 * @param stride stride/linesize of the image
383
 * @param color color of the arrow
384
 */
385
static void draw_arrow(uint8_t *buf, int sx, int sy, int ex, int ey, int w, int h, int stride, int color){ 
386
    int dx= ex - sx;
387
    int dy= ey - sy;
388
    
389
    if(dx*dx + dy*dy > 3*3){
390
        int rx=  dx + dy;
391
        int ry= -dx + dy;
392
        int length= ff_sqrt((rx*rx + ry*ry)<<8);
393
        
394
        //FIXME subpixel accuracy
395
        rx= ROUNDED_DIV(rx*3<<4, length);
396
        ry= ROUNDED_DIV(ry*3<<4, length);
397
        
398
        draw_line(buf, sx, sy, sx + rx, sy + ry, w, h, stride, color);
399
        draw_line(buf, sx, sy, sx - ry, sy + rx, w, h, stride, color);
400
    }
401
    draw_line(buf, sx, sy, ex, ey, w, h, stride, color);
402
}
403

    
404
int ff_h263_decode_frame(AVCodecContext *avctx, 
405
                             void *data, int *data_size,
406
                             UINT8 *buf, int buf_size)
407
{
408
    MpegEncContext *s = avctx->priv_data;
409
    int ret,i;
410
    AVFrame *pict = data; 
411
    float new_aspect;
412
    
413
#ifdef PRINT_FRAME_TIME
414
uint64_t time= rdtsc();
415
#endif
416
#ifdef DEBUG
417
    printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
418
    printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
419
#endif
420
    s->flags= avctx->flags;
421

    
422
    *data_size = 0;
423
   
424
   /* no supplementary picture */
425
    if (buf_size == 0) {
426
        return 0;
427
    }
428

    
429
    if(s->flags&CODEC_FLAG_TRUNCATED){
430
        int next;
431
        
432
        if(s->codec_id==CODEC_ID_MPEG4){
433
            next= mpeg4_find_frame_end(s, buf, buf_size);
434
        }else{
435
            fprintf(stderr, "this codec doesnt support truncated bitstreams\n");
436
            return -1;
437
        }
438
        
439
        if( ff_combine_frame(s, next, &buf, &buf_size) < 0 )
440
            return buf_size;
441
    }
442

    
443
retry:
444
    
445
    if(s->bitstream_buffer_size && buf_size<20){ //divx 5.01+ frame reorder
446
        init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
447
    }else
448
        init_get_bits(&s->gb, buf, buf_size*8);
449
    s->bitstream_buffer_size=0;
450

    
451
    if (!s->context_initialized) {
452
        if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
453
            return -1;
454
    }
455
      
456
    /* let's go :-) */
457
    if (s->msmpeg4_version==5) {
458
        ret= ff_wmv2_decode_picture_header(s);
459
    } else if (s->msmpeg4_version) {
460
        ret = msmpeg4_decode_picture_header(s);
461
    } else if (s->h263_pred) {
462
        if(s->avctx->extradata_size && s->picture_number==0){
463
            GetBitContext gb;
464
            
465
            init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
466
            ret = ff_mpeg4_decode_picture_header(s, &gb);
467
        }
468
        ret = ff_mpeg4_decode_picture_header(s, &s->gb);
469

    
470
        if(s->flags& CODEC_FLAG_LOW_DELAY)
471
            s->low_delay=1;
472
    } else if (s->h263_intel) {
473
        ret = intel_h263_decode_picture_header(s);
474
    } else {
475
        ret = h263_decode_picture_header(s);
476
    }
477
    avctx->has_b_frames= !s->low_delay;
478

    
479
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
480
        if(s->padding_bug_score > -2 && !s->data_partitioning)
481
            s->workaround_bugs |=  FF_BUG_NO_PADDING;
482
        else
483
            s->workaround_bugs &= ~FF_BUG_NO_PADDING;
484

    
485
        if(s->avctx->fourcc == ff_get_fourcc("XVIX")) 
486
            s->workaround_bugs|= FF_BUG_XVID_ILACE;
487
#if 0
488
        if(s->avctx->fourcc == ff_get_fourcc("MP4S")) 
489
            s->workaround_bugs|= FF_BUG_AC_VLC;
490
        
491
        if(s->avctx->fourcc == ff_get_fourcc("M4S2")) 
492
            s->workaround_bugs|= FF_BUG_AC_VLC;
493
#endif
494
        if(s->avctx->fourcc == ff_get_fourcc("UMP4")){
495
            s->workaround_bugs|= FF_BUG_UMP4;
496
            s->workaround_bugs|= FF_BUG_AC_VLC;
497
        }
498

    
499
        if(s->divx_version){
500
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
501
        }
502

    
503
        if(s->divx_version>502){
504
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
505
        }
506

    
507
        if(s->avctx->fourcc == ff_get_fourcc("XVID") && s->xvid_build==0)
508
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
509
        
510
        if(s->avctx->fourcc == ff_get_fourcc("XVID") && s->xvid_build==0)
511
            s->padding_bug_score= 256*256*256*64;
512
        
513
        if(s->xvid_build && s->xvid_build<=3)
514
            s->padding_bug_score= 256*256*256*64;
515
        
516
        if(s->xvid_build && s->xvid_build<=1)
517
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
518

    
519
#define SET_QPEL_FUNC(postfix1, postfix2) \
520
    s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
521
    s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
522
    s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
523

    
524
        if(s->lavc_build && s->lavc_build<4653)
525
            s->workaround_bugs|= FF_BUG_STD_QPEL;
526
        
527
        if(s->lavc_build && s->lavc_build<4655)
528
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
529

    
530
        if(s->divx_version)
531
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
532
//printf("padding_bug_score: %d\n", s->padding_bug_score);
533
#if 0
534
        if(s->divx_version==500)
535
            s->workaround_bugs|= FF_BUG_NO_PADDING;
536

537
        /* very ugly XVID padding bug detection FIXME/XXX solve this differently
538
         * lets hope this at least works
539
         */
540
        if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
541
           && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
542
            s->workaround_bugs|= FF_BUG_NO_PADDING;
543
        
544
        if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
545
            s->workaround_bugs|= FF_BUG_NO_PADDING;
546
#endif
547
    }
548
    
549
    if(s->workaround_bugs& FF_BUG_STD_QPEL){
550
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
551
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
552
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
553
        SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
554
        SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
555
        SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
556

    
557
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
558
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
559
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
560
        SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
561
        SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
562
        SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
563
    }
564

    
565
#if 0 // dump bits per frame / qp / complexity
566
{
567
    static FILE *f=NULL;
568
    if(!f) f=fopen("rate_qp_cplx.txt", "w");
569
    fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
570
}
571
#endif
572
       
573
        /* After H263 & mpeg4 header decode we have the height, width,*/
574
        /* and other parameters. So then we could init the picture   */
575
        /* FIXME: By the way H263 decoder is evolving it should have */
576
        /* an H263EncContext                                         */
577
    if(s->aspected_height)
578
        new_aspect= s->aspected_width*s->width / (float)(s->height*s->aspected_height);
579
    else
580
        new_aspect=0;
581
    
582
    if (   s->width != avctx->width || s->height != avctx->height 
583
        || ABS(new_aspect - avctx->aspect_ratio) > 0.001) {
584
        /* H.263 could change picture size any time */
585
        MPV_common_end(s);
586
        s->context_initialized=0;
587
    }
588
    if (!s->context_initialized) {
589
        avctx->width = s->width;
590
        avctx->height = s->height;
591
        avctx->aspect_ratio= new_aspect;
592

    
593
        goto retry;
594
    }
595

    
596
    if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
597
        s->gob_index = ff_h263_get_gob_height(s);
598

    
599
    if(ret==FRAME_SKIPED) return get_consumed_bytes(s, buf_size);
600
    /* skip if the header was thrashed */
601
    if (ret < 0){
602
        fprintf(stderr, "header damaged\n");
603
        return -1;
604
    }
605
    
606
    // for hurry_up==5
607
    s->current_picture.pict_type= s->pict_type;
608
    s->current_picture.key_frame= s->pict_type == I_TYPE;
609

    
610
    /* skip b frames if we dont have reference frames */
611
    if(s->last_picture.data[0]==NULL && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
612
    /* skip b frames if we are in a hurry */
613
    if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
614
    /* skip everything if we are in a hurry>=5 */
615
    if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
616
    
617
    if(s->next_p_frame_damaged){
618
        if(s->pict_type==B_TYPE)
619
            return get_consumed_bytes(s, buf_size);
620
        else
621
            s->next_p_frame_damaged=0;
622
    }
623

    
624
    if(MPV_frame_start(s, avctx) < 0)
625
        return -1;
626

    
627
#ifdef DEBUG
628
    printf("qscale=%d\n", s->qscale);
629
#endif
630

    
631
    if(s->error_resilience)
632
        memset(s->error_status_table, MV_ERROR|AC_ERROR|DC_ERROR|VP_START|AC_END|DC_END|MV_END, s->mb_num*sizeof(UINT8));
633
    
634
    /* decode each macroblock */
635
    s->block_wrap[0]=
636
    s->block_wrap[1]=
637
    s->block_wrap[2]=
638
    s->block_wrap[3]= s->mb_width*2 + 2;
639
    s->block_wrap[4]=
640
    s->block_wrap[5]= s->mb_width + 2;
641
    s->mb_x=0; 
642
    s->mb_y=0;
643
    
644
    decode_slice(s);
645
    s->error_status_table[0]|= VP_START;
646
    while(s->mb_y<s->mb_height && s->gb.size_in_bits - get_bits_count(&s->gb)>16){
647
        if(s->msmpeg4_version){
648
            if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0)
649
                break;
650
        }else{
651
            if(ff_h263_resync(s)<0)
652
                break;
653
        }
654
        
655
        if(s->msmpeg4_version<4 && s->h263_pred)
656
            ff_mpeg4_clean_buffers(s);
657

    
658
        decode_slice(s);
659

    
660
        s->error_status_table[s->resync_mb_x + s->resync_mb_y*s->mb_width]|= VP_START;
661
    }
662

    
663
    if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
664
        if(msmpeg4_decode_ext_header(s, buf_size) < 0){
665
            s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
666
        }
667
    
668
    /* divx 5.01+ bistream reorder stuff */
669
    if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_version>=500){
670
        int current_pos= get_bits_count(&s->gb)>>3;
671

    
672
        if(   buf_size - current_pos > 5 
673
           && buf_size - current_pos < BITSTREAM_BUFFER_SIZE){
674
            int i;
675
            int startcode_found=0;
676
            for(i=current_pos; i<buf_size-3; i++){
677
                if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
678
                    startcode_found=1;
679
                    break;
680
                }
681
            }
682
            if(startcode_found){
683
                memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
684
                s->bitstream_buffer_size= buf_size - current_pos;
685
            }
686
        }
687
    }
688

    
689
    if(s->error_resilience){
690
        int error=0, num_end_markers=0;
691
        for(i=0; i<s->mb_num; i++){
692
            int status= s->error_status_table[i];
693
#if 0
694
            if(i%s->mb_width == 0) printf("\n");
695
            printf("%2X ", status); 
696
#endif
697
            if(status==0) continue;
698

    
699
            if(status&(DC_ERROR|AC_ERROR|MV_ERROR))
700
                error=1;
701
            if(status&VP_START){
702
                if(num_end_markers) 
703
                    error=1;
704
                num_end_markers=3;
705
            }
706
            if(status&AC_END)
707
                num_end_markers--;
708
            if(status&DC_END)
709
                num_end_markers--;
710
            if(status&MV_END)
711
                num_end_markers--;
712
        }
713
        if(num_end_markers || error){
714
            fprintf(stderr, "concealing errors\n");
715
            ff_error_resilience(s);
716
        }
717
    }
718

    
719
    MPV_frame_end(s);
720

    
721
    if((avctx->debug&FF_DEBUG_VIS_MV) && s->last_picture.data[0]){
722
        const int shift= 1 + s->quarter_sample;
723
        int mb_y;
724
        uint8_t *ptr= s->last_picture.data[0];
725
        s->low_delay=0; //needed to see the vectors without trashing the buffers
726

    
727
        for(mb_y=0; mb_y<s->mb_height; mb_y++){
728
            int mb_x;
729
            for(mb_x=0; mb_x<s->mb_width; mb_x++){
730
                const int mb_index= mb_x + mb_y*s->mb_width;
731
                if(s->co_located_type_table[mb_index] == MV_TYPE_8X8){
732
                    int i;
733
                    for(i=0; i<4; i++){
734
                        int sx= mb_x*16 + 4 + 8*(i&1);
735
                        int sy= mb_y*16 + 4 + 8*(i>>1);
736
                        int xy= 1 + mb_x*2 + (i&1) + (mb_y*2 + 1 + (i>>1))*(s->mb_width*2 + 2);
737
                        int mx= (s->motion_val[xy][0]>>shift) + sx;
738
                        int my= (s->motion_val[xy][1]>>shift) + sy;
739
                        draw_arrow(ptr, sx, sy, mx, my, s->width, s->height, s->linesize, 100);
740
                    }
741
                }else{
742
                    int sx= mb_x*16 + 8;
743
                    int sy= mb_y*16 + 8;
744
                    int xy= 1 + mb_x*2 + (mb_y*2 + 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
                s->mbskip_table[mb_index]=0;
750
            }
751
        }
752
    }
753

    
754

    
755
    if(s->pict_type==B_TYPE || s->low_delay){
756
        *pict= *(AVFrame*)&s->current_picture;
757
    } else {
758
        *pict= *(AVFrame*)&s->last_picture;
759
    }
760

    
761
    if(avctx->debug&FF_DEBUG_QP){
762
        int8_t *qtab= pict->qscale_table;
763
        int x,y;
764
        
765
        for(y=0; y<s->mb_height; y++){
766
            for(x=0; x<s->mb_width; x++){
767
                printf("%2d ", qtab[x + y*s->mb_width]);
768
            }
769
            printf("\n");
770
        }
771
        printf("\n");
772
    }
773

    
774
    /* Return the Picture timestamp as the frame number */
775
    /* we substract 1 because it is added on utils.c    */
776
    avctx->frame_number = s->picture_number - 1;
777

    
778
    /* dont output the last pic after seeking */
779
    if(s->last_picture.data[0] || s->low_delay)
780
        *data_size = sizeof(AVFrame);
781
#ifdef PRINT_FRAME_TIME
782
printf("%Ld\n", rdtsc()-time);
783
#endif
784
    return get_consumed_bytes(s, buf_size);
785
}
786

    
787
AVCodec mpeg4_decoder = {
788
    "mpeg4",
789
    CODEC_TYPE_VIDEO,
790
    CODEC_ID_MPEG4,
791
    sizeof(MpegEncContext),
792
    ff_h263_decode_init,
793
    NULL,
794
    ff_h263_decode_end,
795
    ff_h263_decode_frame,
796
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
797
};
798

    
799
AVCodec h263_decoder = {
800
    "h263",
801
    CODEC_TYPE_VIDEO,
802
    CODEC_ID_H263,
803
    sizeof(MpegEncContext),
804
    ff_h263_decode_init,
805
    NULL,
806
    ff_h263_decode_end,
807
    ff_h263_decode_frame,
808
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
809
};
810

    
811
AVCodec msmpeg4v1_decoder = {
812
    "msmpeg4v1",
813
    CODEC_TYPE_VIDEO,
814
    CODEC_ID_MSMPEG4V1,
815
    sizeof(MpegEncContext),
816
    ff_h263_decode_init,
817
    NULL,
818
    ff_h263_decode_end,
819
    ff_h263_decode_frame,
820
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
821
};
822

    
823
AVCodec msmpeg4v2_decoder = {
824
    "msmpeg4v2",
825
    CODEC_TYPE_VIDEO,
826
    CODEC_ID_MSMPEG4V2,
827
    sizeof(MpegEncContext),
828
    ff_h263_decode_init,
829
    NULL,
830
    ff_h263_decode_end,
831
    ff_h263_decode_frame,
832
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
833
};
834

    
835
AVCodec msmpeg4v3_decoder = {
836
    "msmpeg4",
837
    CODEC_TYPE_VIDEO,
838
    CODEC_ID_MSMPEG4V3,
839
    sizeof(MpegEncContext),
840
    ff_h263_decode_init,
841
    NULL,
842
    ff_h263_decode_end,
843
    ff_h263_decode_frame,
844
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
845
};
846

    
847
AVCodec wmv1_decoder = {
848
    "wmv1",
849
    CODEC_TYPE_VIDEO,
850
    CODEC_ID_WMV1,
851
    sizeof(MpegEncContext),
852
    ff_h263_decode_init,
853
    NULL,
854
    ff_h263_decode_end,
855
    ff_h263_decode_frame,
856
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
857
};
858

    
859
AVCodec h263i_decoder = {
860
    "h263i",
861
    CODEC_TYPE_VIDEO,
862
    CODEC_ID_H263I,
863
    sizeof(MpegEncContext),
864
    ff_h263_decode_init,
865
    NULL,
866
    ff_h263_decode_end,
867
    ff_h263_decode_frame,
868
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
869
};
870