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ffmpeg / libavcodec / h263dec.c @ 71160c55

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1
/*
2
 * H.263 decoder
3
 * Copyright (c) 2001 Fabrice Bellard.
4
 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5
 *
6
 * This library is free software; you can redistribute it and/or
7
 * modify it under the terms of the GNU Lesser General Public
8
 * License as published by the Free Software Foundation; either
9
 * version 2 of the License, or (at your option) any later version.
10
 *
11
 * This library is distributed in the hope that it will be useful,
12
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14
 * Lesser General Public License for more details.
15
 *
16
 * You should have received a copy of the GNU Lesser General Public
17
 * License along with this library; if not, write to the Free Software
18
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19
 */
20

    
21
/**
22
 * @file h263dec.c
23
 * H.263 decoder.
24
 */
25

    
26
#include "avcodec.h"
27
#include "dsputil.h"
28
#include "mpegvideo.h"
29

    
30
//#define DEBUG
31
//#define PRINT_FRAME_TIME
32

    
33
int ff_h263_decode_init(AVCodecContext *avctx)
34
{
35
    MpegEncContext *s = avctx->priv_data;
36

    
37
    s->avctx = avctx;
38
    s->out_format = FMT_H263;
39

    
40
    s->width  = avctx->coded_width;
41
    s->height = avctx->coded_height;
42
    s->workaround_bugs= avctx->workaround_bugs;
43

    
44
    // set defaults
45
    MPV_decode_defaults(s);
46
    s->quant_precision=5;
47
    s->decode_mb= ff_h263_decode_mb;
48
    s->low_delay= 1;
49
    avctx->pix_fmt= PIX_FMT_YUV420P;
50
    s->unrestricted_mv= 1;
51

    
52
    /* select sub codec */
53
    switch(avctx->codec->id) {
54
    case CODEC_ID_H263:
55
        s->unrestricted_mv= 0;
56
        break;
57
    case CODEC_ID_MPEG4:
58
        s->decode_mb= ff_mpeg4_decode_mb;
59
        s->time_increment_bits = 4; /* default value for broken headers */
60
        s->h263_pred = 1;
61
        s->low_delay = 0; //default, might be overriden in the vol header during header parsing
62
        break;
63
    case CODEC_ID_MSMPEG4V1:
64
        s->h263_msmpeg4 = 1;
65
        s->h263_pred = 1;
66
        s->msmpeg4_version=1;
67
        break;
68
    case CODEC_ID_MSMPEG4V2:
69
        s->h263_msmpeg4 = 1;
70
        s->h263_pred = 1;
71
        s->msmpeg4_version=2;
72
        break;
73
    case CODEC_ID_MSMPEG4V3:
74
        s->h263_msmpeg4 = 1;
75
        s->h263_pred = 1;
76
        s->msmpeg4_version=3;
77
        break;
78
    case CODEC_ID_WMV1:
79
        s->h263_msmpeg4 = 1;
80
        s->h263_pred = 1;
81
        s->msmpeg4_version=4;
82
        break;
83
    case CODEC_ID_WMV2:
84
        s->h263_msmpeg4 = 1;
85
        s->h263_pred = 1;
86
        s->msmpeg4_version=5;
87
        break;
88
    case CODEC_ID_WMV3:
89
        s->h263_msmpeg4 = 1;
90
        s->h263_pred = 1;
91
        s->msmpeg4_version=6;
92
        break;
93
    case CODEC_ID_H263I:
94
        break;
95
    case CODEC_ID_FLV1:
96
        s->h263_flv = 1;
97
        break;
98
    default:
99
        return -1;
100
    }
101
    s->codec_id= avctx->codec->id;
102

    
103
    /* for h263, we allocate the images after having read the header */
104
    if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
105
        if (MPV_common_init(s) < 0)
106
            return -1;
107

    
108
    if (s->h263_msmpeg4)
109
        ff_msmpeg4_decode_init(s);
110
    else
111
        h263_decode_init_vlc(s);
112

    
113
    return 0;
114
}
115

    
116
int ff_h263_decode_end(AVCodecContext *avctx)
117
{
118
    MpegEncContext *s = avctx->priv_data;
119

    
120
    MPV_common_end(s);
121
    return 0;
122
}
123

    
124
/**
125
 * returns the number of bytes consumed for building the current frame
126
 */
127
static int get_consumed_bytes(MpegEncContext *s, int buf_size){
128
    int pos= (get_bits_count(&s->gb)+7)>>3;
129

    
130
    if(s->divx_packed){
131
        //we would have to scan through the whole buf to handle the weird reordering ...
132
        return buf_size;
133
    }else if(s->flags&CODEC_FLAG_TRUNCATED){
134
        pos -= s->parse_context.last_index;
135
        if(pos<0) pos=0; // padding is not really read so this might be -1
136
        return pos;
137
    }else{
138
        if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
139
        if(pos+10>buf_size) pos=buf_size; // oops ;)
140

    
141
        return pos;
142
    }
143
}
144

    
145
static int decode_slice(MpegEncContext *s){
146
    const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
147
    const int mb_size= 16>>s->avctx->lowres;
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
    ff_set_qscale(s, 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 were modified */
165
        s->first_slice_line=1;
166
        s->mb_x= s->resync_mb_x;
167
        s->mb_y= s->resync_mb_y;
168
        ff_set_qscale(s, qscale);
169
    }
170

    
171
    for(; s->mb_y < s->mb_height; s->mb_y++) {
172
        /* per-row end of slice checks */
173
        if(s->msmpeg4_version){
174
            if(s->resync_mb_y + s->slice_height == s->mb_y){
175
                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);
176

    
177
                return 0;
178
            }
179
        }
180

    
181
        if(s->msmpeg4_version==1){
182
            s->last_dc[0]=
183
            s->last_dc[1]=
184
            s->last_dc[2]= 128;
185
        }
186

    
187
        ff_init_block_index(s);
188
        for(; s->mb_x < s->mb_width; s->mb_x++) {
189
            int ret;
190

    
191
            ff_update_block_index(s);
192

    
193
            if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
194
                s->first_slice_line=0;
195
            }
196

    
197
            /* DCT & quantize */
198

    
199
            s->mv_dir = MV_DIR_FORWARD;
200
            s->mv_type = MV_TYPE_16X16;
201
//            s->mb_skipped = 0;
202
//printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
203
            ret= s->decode_mb(s, s->block);
204

    
205
            if (s->pict_type!=B_TYPE)
206
                ff_h263_update_motion_val(s);
207

    
208
            if(ret<0){
209
                const int xy= s->mb_x + s->mb_y*s->mb_stride;
210
                if(ret==SLICE_END){
211
                    MPV_decode_mb(s, s->block);
212
                    if(s->loop_filter)
213
                        ff_h263_loop_filter(s);
214

    
215
//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));
216
                    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);
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*mb_size, mb_size);
223
                        s->mb_y++;
224
                    }
225
                    return 0;
226
                }else if(ret==SLICE_NOEND){
227
                    av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
228
                    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);
229
                    return -1;
230
                }
231
                av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
232
                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);
233

    
234
                return -1;
235
            }
236

    
237
            MPV_decode_mb(s, s->block);
238
            if(s->loop_filter)
239
                ff_h263_loop_filter(s);
240
        }
241

    
242
        ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
243

    
244
        s->mb_x= 0;
245
    }
246

    
247
    assert(s->mb_x==0 && s->mb_y==s->mb_height);
248

    
249
    /* try to detect the padding bug */
250
    if(      s->codec_id==CODEC_ID_MPEG4
251
       &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
252
       &&    s->gb.size_in_bits - get_bits_count(&s->gb) >=0
253
       &&    s->gb.size_in_bits - get_bits_count(&s->gb) < 48
254
//       &&   !s->resync_marker
255
       &&   !s->data_partitioning){
256

    
257
        const int bits_count= get_bits_count(&s->gb);
258
        const int bits_left = s->gb.size_in_bits - bits_count;
259

    
260
        if(bits_left==0){
261
            s->padding_bug_score+=16;
262
        } else if(bits_left != 1){
263
            int v= show_bits(&s->gb, 8);
264
            v|= 0x7F >> (7-(bits_count&7));
265

    
266
            if(v==0x7F && bits_left<=8)
267
                s->padding_bug_score--;
268
            else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
269
                s->padding_bug_score+= 4;
270
            else
271
                s->padding_bug_score++;
272
        }
273
    }
274

    
275
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
276
        if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version || !s->resync_marker)*/)
277
            s->workaround_bugs |=  FF_BUG_NO_PADDING;
278
        else
279
            s->workaround_bugs &= ~FF_BUG_NO_PADDING;
280
    }
281

    
282
    // handle formats which don't have unique end markers
283
    if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
284
        int left= s->gb.size_in_bits - get_bits_count(&s->gb);
285
        int max_extra=7;
286

    
287
        /* no markers in M$ crap */
288
        if(s->msmpeg4_version && s->pict_type==I_TYPE)
289
            max_extra+= 17;
290

    
291
        /* buggy padding but the frame should still end approximately at the bitstream end */
292
        if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_resilience>=3)
293
            max_extra+= 48;
294
        else if((s->workaround_bugs&FF_BUG_NO_PADDING))
295
            max_extra+= 256*256*256*64;
296

    
297
        if(left>max_extra){
298
            av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
299
        }
300
        else if(left<0){
301
            av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
302
        }else
303
            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);
304

    
305
        return 0;
306
    }
307

    
308
    av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
309
            s->gb.size_in_bits - get_bits_count(&s->gb),
310
            show_bits(&s->gb, 24), s->padding_bug_score);
311

    
312
    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);
313

    
314
    return -1;
315
}
316

    
317
/**
318
 * finds the end of the current frame in the bitstream.
319
 * @return the position of the first byte of the next frame, or -1
320
 */
321
int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
322
    int vop_found, i;
323
    uint32_t state;
324

    
325
    vop_found= pc->frame_start_found;
326
    state= pc->state;
327

    
328
    i=0;
329
    if(!vop_found){
330
        for(i=0; i<buf_size; i++){
331
            state= (state<<8) | buf[i];
332
            if(state == 0x1B6){
333
                i++;
334
                vop_found=1;
335
                break;
336
            }
337
        }
338
    }
339

    
340
    if(vop_found){
341
        /* EOF considered as end of frame */
342
        if (buf_size == 0)
343
            return 0;
344
        for(; i<buf_size; i++){
345
            state= (state<<8) | buf[i];
346
            if((state&0xFFFFFF00) == 0x100){
347
                pc->frame_start_found=0;
348
                pc->state=-1;
349
                return i-3;
350
            }
351
        }
352
    }
353
    pc->frame_start_found= vop_found;
354
    pc->state= state;
355
    return END_NOT_FOUND;
356
}
357

    
358
static int h263_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
359
    int vop_found, i;
360
    uint32_t state;
361

    
362
    vop_found= pc->frame_start_found;
363
    state= pc->state;
364

    
365
    i=0;
366
    if(!vop_found){
367
        for(i=0; i<buf_size; i++){
368
            state= (state<<8) | buf[i];
369
            if(state>>(32-22) == 0x20){
370
                i++;
371
                vop_found=1;
372
                break;
373
            }
374
        }
375
    }
376

    
377
    if(vop_found){
378
      for(; i<buf_size; i++){
379
        state= (state<<8) | buf[i];
380
        if(state>>(32-22) == 0x20){
381
            pc->frame_start_found=0;
382
            pc->state=-1;
383
            return i-3;
384
        }
385
      }
386
    }
387
    pc->frame_start_found= vop_found;
388
    pc->state= state;
389

    
390
    return END_NOT_FOUND;
391
}
392

    
393
static int h263_parse(AVCodecParserContext *s,
394
                           AVCodecContext *avctx,
395
                           uint8_t **poutbuf, int *poutbuf_size,
396
                           const uint8_t *buf, int buf_size)
397
{
398
    ParseContext *pc = s->priv_data;
399
    int next;
400

    
401
    next= h263_find_frame_end(pc, buf, buf_size);
402

    
403
    if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
404
        *poutbuf = NULL;
405
        *poutbuf_size = 0;
406
        return buf_size;
407
    }
408

    
409
    *poutbuf = (uint8_t *)buf;
410
    *poutbuf_size = buf_size;
411
    return next;
412
}
413

    
414
int ff_h263_decode_frame(AVCodecContext *avctx,
415
                             void *data, int *data_size,
416
                             uint8_t *buf, int buf_size)
417
{
418
    MpegEncContext *s = avctx->priv_data;
419
    int ret;
420
    AVFrame *pict = data;
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
    s->flags2= avctx->flags2;
431

    
432
    /* no supplementary picture */
433
    if (buf_size == 0) {
434
        /* special case for last picture */
435
        if (s->low_delay==0 && s->next_picture_ptr) {
436
            *pict= *(AVFrame*)s->next_picture_ptr;
437
            s->next_picture_ptr= NULL;
438

    
439
            *data_size = sizeof(AVFrame);
440
        }
441

    
442
        return 0;
443
    }
444

    
445
    if(s->flags&CODEC_FLAG_TRUNCATED){
446
        int next;
447

    
448
        if(s->codec_id==CODEC_ID_MPEG4){
449
            next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
450
        }else if(s->codec_id==CODEC_ID_H263){
451
            next= h263_find_frame_end(&s->parse_context, buf, buf_size);
452
        }else{
453
            av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
454
            return -1;
455
        }
456

    
457
        if( ff_combine_frame(&s->parse_context, next, &buf, &buf_size) < 0 )
458
            return buf_size;
459
    }
460

    
461

    
462
retry:
463

    
464
    if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
465
        init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
466
    }else
467
        init_get_bits(&s->gb, buf, buf_size*8);
468
    s->bitstream_buffer_size=0;
469

    
470
    if (!s->context_initialized) {
471
        if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
472
            return -1;
473
    }
474

    
475
    //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
476
    if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
477
        int i= ff_find_unused_picture(s, 0);
478
        s->current_picture_ptr= &s->picture[i];
479
    }
480

    
481
    /* let's go :-) */
482
    if (s->msmpeg4_version==5) {
483
        ret= ff_wmv2_decode_picture_header(s);
484
    } else if (s->msmpeg4_version) {
485
        ret = msmpeg4_decode_picture_header(s);
486
    } else if (s->h263_pred) {
487
        if(s->avctx->extradata_size && s->picture_number==0){
488
            GetBitContext gb;
489

    
490
            init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
491
            ret = ff_mpeg4_decode_picture_header(s, &gb);
492
        }
493
        ret = ff_mpeg4_decode_picture_header(s, &s->gb);
494

    
495
        if(s->flags& CODEC_FLAG_LOW_DELAY)
496
            s->low_delay=1;
497
    } else if (s->codec_id == CODEC_ID_H263I) {
498
        ret = intel_h263_decode_picture_header(s);
499
    } else if (s->h263_flv) {
500
        ret = flv_h263_decode_picture_header(s);
501
    } else {
502
        ret = h263_decode_picture_header(s);
503
    }
504

    
505
    if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
506

    
507
    /* skip if the header was thrashed */
508
    if (ret < 0){
509
        av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
510
        return -1;
511
    }
512

    
513
    avctx->has_b_frames= !s->low_delay;
514

    
515
    if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
516
        if(s->avctx->stream_codec_tag == ff_get_fourcc("XVID") ||
517
           s->avctx->codec_tag == ff_get_fourcc("XVID") || s->avctx->codec_tag == ff_get_fourcc("XVIX"))
518
            s->xvid_build= -1;
519
#if 0
520
        if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
521
           && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
522
            s->xvid_build= -1;
523
#endif
524
    }
525

    
526
    if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
527
        if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
528
            s->divx_version= 400; //divx 4
529
    }
530

    
531
    if(s->xvid_build && s->divx_version){
532
        s->divx_version=
533
        s->divx_build= 0;
534
    }
535

    
536
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
537
        if(s->avctx->codec_tag == ff_get_fourcc("XVIX"))
538
            s->workaround_bugs|= FF_BUG_XVID_ILACE;
539

    
540
        if(s->avctx->codec_tag == ff_get_fourcc("UMP4")){
541
            s->workaround_bugs|= FF_BUG_UMP4;
542
        }
543

    
544
        if(s->divx_version>=500){
545
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
546
        }
547

    
548
        if(s->divx_version>502){
549
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
550
        }
551

    
552
        if(s->xvid_build && s->xvid_build<=3)
553
            s->padding_bug_score= 256*256*256*64;
554

    
555
        if(s->xvid_build && s->xvid_build<=1)
556
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
557

    
558
        if(s->xvid_build && s->xvid_build<=12)
559
            s->workaround_bugs|= FF_BUG_EDGE;
560

    
561
        if(s->xvid_build && s->xvid_build<=32)
562
            s->workaround_bugs|= FF_BUG_DC_CLIP;
563

    
564
#define SET_QPEL_FUNC(postfix1, postfix2) \
565
    s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
566
    s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
567
    s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
568

    
569
        if(s->lavc_build && s->lavc_build<4653)
570
            s->workaround_bugs|= FF_BUG_STD_QPEL;
571

    
572
        if(s->lavc_build && s->lavc_build<4655)
573
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
574

    
575
        if(s->lavc_build && s->lavc_build<4670){
576
            s->workaround_bugs|= FF_BUG_EDGE;
577
        }
578

    
579
        if(s->lavc_build && s->lavc_build<=4712)
580
            s->workaround_bugs|= FF_BUG_DC_CLIP;
581

    
582
        if(s->divx_version)
583
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
584
//printf("padding_bug_score: %d\n", s->padding_bug_score);
585
        if(s->divx_version==501 && s->divx_build==20020416)
586
            s->padding_bug_score= 256*256*256*64;
587

    
588
        if(s->divx_version && s->divx_version<500){
589
            s->workaround_bugs|= FF_BUG_EDGE;
590
        }
591

    
592
        if(s->divx_version)
593
            s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
594
#if 0
595
        if(s->divx_version==500)
596
            s->padding_bug_score= 256*256*256*64;
597

598
        /* very ugly XVID padding bug detection FIXME/XXX solve this differently
599
         * lets hope this at least works
600
         */
601
        if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
602
           && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
603
            s->workaround_bugs|= FF_BUG_NO_PADDING;
604

605
        if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
606
            s->workaround_bugs|= FF_BUG_NO_PADDING;
607
#endif
608
    }
609

    
610
    if(s->workaround_bugs& FF_BUG_STD_QPEL){
611
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
612
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
613
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
614
        SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
615
        SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
616
        SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
617

    
618
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
619
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
620
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
621
        SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
622
        SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
623
        SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
624
    }
625

    
626
    if(avctx->debug & FF_DEBUG_BUGS)
627
        av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
628
               s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
629
               s->divx_packed ? "p" : "");
630

    
631
#if 0 // dump bits per frame / qp / complexity
632
{
633
    static FILE *f=NULL;
634
    if(!f) f=fopen("rate_qp_cplx.txt", "w");
635
    fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
636
}
637
#endif
638

    
639
#if defined(HAVE_MMX) && defined(CONFIG_GPL)
640
    if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & MM_MMX) && !(s->flags&CODEC_FLAG_BITEXACT)){
641
        avctx->idct_algo= FF_IDCT_XVIDMMX;
642
        avctx->coded_width= 0; // force reinit
643
//        dsputil_init(&s->dsp, avctx);
644
        s->picture_number=0;
645
    }
646
#endif
647

    
648
        /* After H263 & mpeg4 header decode we have the height, width,*/
649
        /* and other parameters. So then we could init the picture   */
650
        /* FIXME: By the way H263 decoder is evolving it should have */
651
        /* an H263EncContext                                         */
652

    
653
    if (   s->width  != avctx->coded_width
654
        || s->height != avctx->coded_height) {
655
        /* H.263 could change picture size any time */
656
        ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
657
        s->parse_context.buffer=0;
658
        MPV_common_end(s);
659
        s->parse_context= pc;
660
    }
661
    if (!s->context_initialized) {
662
        avcodec_set_dimensions(avctx, s->width, s->height);
663

    
664
        goto retry;
665
    }
666

    
667
    if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
668
        s->gob_index = ff_h263_get_gob_height(s);
669

    
670
    // for hurry_up==5
671
    s->current_picture.pict_type= s->pict_type;
672
    s->current_picture.key_frame= s->pict_type == I_TYPE;
673

    
674
    /* skip B-frames if we don't have reference frames */
675
    if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
676
    /* skip b frames if we are in a hurry */
677
    if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
678
    if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)
679
       || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)
680
       ||  avctx->skip_frame >= AVDISCARD_ALL)
681
        return get_consumed_bytes(s, buf_size);
682
    /* skip everything if we are in a hurry>=5 */
683
    if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
684

    
685
    if(s->next_p_frame_damaged){
686
        if(s->pict_type==B_TYPE)
687
            return get_consumed_bytes(s, buf_size);
688
        else
689
            s->next_p_frame_damaged=0;
690
    }
691

    
692
    if(MPV_frame_start(s, avctx) < 0)
693
        return -1;
694

    
695
#ifdef DEBUG
696
    printf("qscale=%d\n", s->qscale);
697
#endif
698

    
699
    ff_er_frame_start(s);
700

    
701
    //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
702
    //which isnt available before MPV_frame_start()
703
    if (s->msmpeg4_version==5){
704
        if(ff_wmv2_decode_secondary_picture_header(s) < 0)
705
            return -1;
706
    }
707

    
708
    /* decode each macroblock */
709
    s->mb_x=0;
710
    s->mb_y=0;
711

    
712
    decode_slice(s);
713
    while(s->mb_y<s->mb_height){
714
        if(s->msmpeg4_version){
715
            if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
716
                break;
717
        }else{
718
            if(ff_h263_resync(s)<0)
719
                break;
720
        }
721

    
722
        if(s->msmpeg4_version<4 && s->h263_pred)
723
            ff_mpeg4_clean_buffers(s);
724

    
725
        decode_slice(s);
726
    }
727

    
728
    if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
729
        if(msmpeg4_decode_ext_header(s, buf_size) < 0){
730
            s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
731
        }
732

    
733
    /* divx 5.01+ bistream reorder stuff */
734
    if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
735
        int current_pos= get_bits_count(&s->gb)>>3;
736
        int startcode_found=0;
737

    
738
        if(buf_size - current_pos > 5){
739
            int i;
740
            for(i=current_pos; i<buf_size-3; i++){
741
                if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
742
                    startcode_found=1;
743
                    break;
744
                }
745
            }
746
        }
747
        if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
748
            startcode_found=1;
749
            current_pos=0;
750
        }
751

    
752
        if(startcode_found){
753
            s->bitstream_buffer= av_fast_realloc(
754
                s->bitstream_buffer,
755
                &s->allocated_bitstream_buffer_size,
756
                buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
757
            memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
758
            s->bitstream_buffer_size= buf_size - current_pos;
759
        }
760
    }
761

    
762
    ff_er_frame_end(s);
763

    
764
    MPV_frame_end(s);
765

    
766
assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
767
assert(s->current_picture.pict_type == s->pict_type);
768
    if(s->pict_type==B_TYPE || s->low_delay){
769
        *pict= *(AVFrame*)&s->current_picture;
770
        ff_print_debug_info(s, pict);
771
    } else {
772
        *pict= *(AVFrame*)&s->last_picture;
773
        if(pict)
774
            ff_print_debug_info(s, pict);
775
    }
776

    
777
    /* Return the Picture timestamp as the frame number */
778
    /* we substract 1 because it is added on utils.c    */
779
    avctx->frame_number = s->picture_number - 1;
780

    
781
    /* don't output the last pic after seeking */
782
    if(s->last_picture_ptr || s->low_delay)
783
        *data_size = sizeof(AVFrame);
784
#ifdef PRINT_FRAME_TIME
785
printf("%Ld\n", rdtsc()-time);
786
#endif
787

    
788
    return get_consumed_bytes(s, buf_size);
789
}
790

    
791
AVCodec mpeg4_decoder = {
792
    "mpeg4",
793
    CODEC_TYPE_VIDEO,
794
    CODEC_ID_MPEG4,
795
    sizeof(MpegEncContext),
796
    ff_h263_decode_init,
797
    NULL,
798
    ff_h263_decode_end,
799
    ff_h263_decode_frame,
800
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
801
    .flush= ff_mpeg_flush,
802
};
803

    
804
AVCodec h263_decoder = {
805
    "h263",
806
    CODEC_TYPE_VIDEO,
807
    CODEC_ID_H263,
808
    sizeof(MpegEncContext),
809
    ff_h263_decode_init,
810
    NULL,
811
    ff_h263_decode_end,
812
    ff_h263_decode_frame,
813
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
814
    .flush= ff_mpeg_flush,
815
};
816

    
817
AVCodec msmpeg4v1_decoder = {
818
    "msmpeg4v1",
819
    CODEC_TYPE_VIDEO,
820
    CODEC_ID_MSMPEG4V1,
821
    sizeof(MpegEncContext),
822
    ff_h263_decode_init,
823
    NULL,
824
    ff_h263_decode_end,
825
    ff_h263_decode_frame,
826
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
827
};
828

    
829
AVCodec msmpeg4v2_decoder = {
830
    "msmpeg4v2",
831
    CODEC_TYPE_VIDEO,
832
    CODEC_ID_MSMPEG4V2,
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
};
840

    
841
AVCodec msmpeg4v3_decoder = {
842
    "msmpeg4",
843
    CODEC_TYPE_VIDEO,
844
    CODEC_ID_MSMPEG4V3,
845
    sizeof(MpegEncContext),
846
    ff_h263_decode_init,
847
    NULL,
848
    ff_h263_decode_end,
849
    ff_h263_decode_frame,
850
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
851
};
852

    
853
AVCodec wmv1_decoder = {
854
    "wmv1",
855
    CODEC_TYPE_VIDEO,
856
    CODEC_ID_WMV1,
857
    sizeof(MpegEncContext),
858
    ff_h263_decode_init,
859
    NULL,
860
    ff_h263_decode_end,
861
    ff_h263_decode_frame,
862
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
863
};
864

    
865
AVCodec h263i_decoder = {
866
    "h263i",
867
    CODEC_TYPE_VIDEO,
868
    CODEC_ID_H263I,
869
    sizeof(MpegEncContext),
870
    ff_h263_decode_init,
871
    NULL,
872
    ff_h263_decode_end,
873
    ff_h263_decode_frame,
874
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
875
};
876

    
877
AVCodec flv_decoder = {
878
    "flv",
879
    CODEC_TYPE_VIDEO,
880
    CODEC_ID_FLV1,
881
    sizeof(MpegEncContext),
882
    ff_h263_decode_init,
883
    NULL,
884
    ff_h263_decode_end,
885
    ff_h263_decode_frame,
886
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
887
};
888

    
889
AVCodecParser h263_parser = {
890
    { CODEC_ID_H263 },
891
    sizeof(ParseContext),
892
    NULL,
893
    h263_parse,
894
    ff_parse_close,
895
};