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ffmpeg / libavcodec / h263dec.c @ c53d2d90

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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 file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2.1 of the License, or (at your option) any later version.
12
 *
13
 * FFmpeg is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * Lesser General Public License for more details.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
19
 * License along with FFmpeg; if not, write to the Free Software
20
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22

    
23
/**
24
 * @file h263dec.c
25
 * H.263 decoder.
26
 */
27

    
28
#include "avcodec.h"
29
#include "dsputil.h"
30
#include "mpegvideo.h"
31

    
32
//#define DEBUG
33
//#define PRINT_FRAME_TIME
34

    
35
int ff_h263_decode_init(AVCodecContext *avctx)
36
{
37
    MpegEncContext *s = avctx->priv_data;
38

    
39
    s->avctx = avctx;
40
    s->out_format = FMT_H263;
41

    
42
    s->width  = avctx->coded_width;
43
    s->height = avctx->coded_height;
44
    s->workaround_bugs= avctx->workaround_bugs;
45

    
46
    // set defaults
47
    MPV_decode_defaults(s);
48
    s->quant_precision=5;
49
    s->decode_mb= ff_h263_decode_mb;
50
    s->low_delay= 1;
51
    avctx->pix_fmt= PIX_FMT_YUV420P;
52
    s->unrestricted_mv= 1;
53

    
54
    /* select sub codec */
55
    switch(avctx->codec->id) {
56
    case CODEC_ID_H263:
57
        s->unrestricted_mv= 0;
58
        break;
59
    case CODEC_ID_MPEG4:
60
        s->decode_mb= ff_mpeg4_decode_mb;
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_VC1:
91
    case CODEC_ID_WMV3:
92
        s->h263_msmpeg4 = 1;
93
        s->h263_pred = 1;
94
        s->msmpeg4_version=6;
95
        break;
96
    case CODEC_ID_H263I:
97
        break;
98
    case CODEC_ID_FLV1:
99
        s->h263_flv = 1;
100
        break;
101
    default:
102
        return -1;
103
    }
104
    s->codec_id= avctx->codec->id;
105

    
106
    /* for h263, we allocate the images after having read the header */
107
    if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
108
        if (MPV_common_init(s) < 0)
109
            return -1;
110

    
111
    if (s->h263_msmpeg4)
112
        ff_msmpeg4_decode_init(s);
113
    else
114
        h263_decode_init_vlc(s);
115

    
116
    return 0;
117
}
118

    
119
int ff_h263_decode_end(AVCodecContext *avctx)
120
{
121
    MpegEncContext *s = avctx->priv_data;
122

    
123
    MPV_common_end(s);
124
    return 0;
125
}
126

    
127
/**
128
 * returns the number of bytes consumed for building the current frame
129
 */
130
static int get_consumed_bytes(MpegEncContext *s, int buf_size){
131
    int pos= (get_bits_count(&s->gb)+7)>>3;
132

    
133
    if(s->divx_packed){
134
        //we would have to scan through the whole buf to handle the weird reordering ...
135
        return buf_size;
136
    }else if(s->flags&CODEC_FLAG_TRUNCATED){
137
        pos -= s->parse_context.last_index;
138
        if(pos<0) pos=0; // padding is not really read so this might be -1
139
        return pos;
140
    }else{
141
        if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
142
        if(pos+10>buf_size) pos=buf_size; // oops ;)
143

    
144
        return pos;
145
    }
146
}
147

    
148
static int decode_slice(MpegEncContext *s){
149
    const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
150
    const int mb_size= 16>>s->avctx->lowres;
151
    s->last_resync_gb= s->gb;
152
    s->first_slice_line= 1;
153

    
154
    s->resync_mb_x= s->mb_x;
155
    s->resync_mb_y= s->mb_y;
156

    
157
    ff_set_qscale(s, s->qscale);
158

    
159
    if(s->partitioned_frame){
160
        const int qscale= s->qscale;
161

    
162
        if(s->codec_id==CODEC_ID_MPEG4){
163
            if(ff_mpeg4_decode_partitions(s) < 0)
164
                return -1;
165
        }
166

    
167
        /* restore variables which were modified */
168
        s->first_slice_line=1;
169
        s->mb_x= s->resync_mb_x;
170
        s->mb_y= s->resync_mb_y;
171
        ff_set_qscale(s, qscale);
172
    }
173

    
174
    for(; s->mb_y < s->mb_height; s->mb_y++) {
175
        /* per-row end of slice checks */
176
        if(s->msmpeg4_version){
177
            if(s->resync_mb_y + s->slice_height == s->mb_y){
178
                ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
179

    
180
                return 0;
181
            }
182
        }
183

    
184
        if(s->msmpeg4_version==1){
185
            s->last_dc[0]=
186
            s->last_dc[1]=
187
            s->last_dc[2]= 128;
188
        }
189

    
190
        ff_init_block_index(s);
191
        for(; s->mb_x < s->mb_width; s->mb_x++) {
192
            int ret;
193

    
194
            ff_update_block_index(s);
195

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

    
200
            /* DCT & quantize */
201

    
202
            s->mv_dir = MV_DIR_FORWARD;
203
            s->mv_type = MV_TYPE_16X16;
204
//            s->mb_skipped = 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
            if (s->pict_type!=B_TYPE)
209
                ff_h263_update_motion_val(s);
210

    
211
            if(ret<0){
212
                const int xy= s->mb_x + s->mb_y*s->mb_stride;
213
                if(ret==SLICE_END){
214
                    MPV_decode_mb(s, s->block);
215
                    if(s->loop_filter)
216
                        ff_h263_loop_filter(s);
217

    
218
//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));
219
                    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);
220

    
221
                    s->padding_bug_score--;
222

    
223
                    if(++s->mb_x >= s->mb_width){
224
                        s->mb_x=0;
225
                        ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
226
                        s->mb_y++;
227
                    }
228
                    return 0;
229
                }else if(ret==SLICE_NOEND){
230
                    av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
231
                    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);
232
                    return -1;
233
                }
234
                av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
235
                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);
236

    
237
                return -1;
238
            }
239

    
240
            MPV_decode_mb(s, s->block);
241
            if(s->loop_filter)
242
                ff_h263_loop_filter(s);
243
        }
244

    
245
        ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
246

    
247
        s->mb_x= 0;
248
    }
249

    
250
    assert(s->mb_x==0 && s->mb_y==s->mb_height);
251

    
252
    /* try to detect the padding bug */
253
    if(      s->codec_id==CODEC_ID_MPEG4
254
       &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
255
       &&    s->gb.size_in_bits - get_bits_count(&s->gb) >=0
256
       &&    s->gb.size_in_bits - get_bits_count(&s->gb) < 48
257
//       &&   !s->resync_marker
258
       &&   !s->data_partitioning){
259

    
260
        const int bits_count= get_bits_count(&s->gb);
261
        const int bits_left = s->gb.size_in_bits - bits_count;
262

    
263
        if(bits_left==0){
264
            s->padding_bug_score+=16;
265
        } else if(bits_left != 1){
266
            int v= show_bits(&s->gb, 8);
267
            v|= 0x7F >> (7-(bits_count&7));
268

    
269
            if(v==0x7F && bits_left<=8)
270
                s->padding_bug_score--;
271
            else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
272
                s->padding_bug_score+= 4;
273
            else
274
                s->padding_bug_score++;
275
        }
276
    }
277

    
278
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
279
        if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version || !s->resync_marker)*/)
280
            s->workaround_bugs |=  FF_BUG_NO_PADDING;
281
        else
282
            s->workaround_bugs &= ~FF_BUG_NO_PADDING;
283
    }
284

    
285
    // handle formats which don't have unique end markers
286
    if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
287
        int left= s->gb.size_in_bits - get_bits_count(&s->gb);
288
        int max_extra=7;
289

    
290
        /* no markers in M$ crap */
291
        if(s->msmpeg4_version && s->pict_type==I_TYPE)
292
            max_extra+= 17;
293

    
294
        /* buggy padding but the frame should still end approximately at the bitstream end */
295
        if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_resilience>=3)
296
            max_extra+= 48;
297
        else if((s->workaround_bugs&FF_BUG_NO_PADDING))
298
            max_extra+= 256*256*256*64;
299

    
300
        if(left>max_extra){
301
            av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
302
        }
303
        else if(left<0){
304
            av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
305
        }else
306
            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);
307

    
308
        return 0;
309
    }
310

    
311
    av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
312
            s->gb.size_in_bits - get_bits_count(&s->gb),
313
            show_bits(&s->gb, 24), s->padding_bug_score);
314

    
315
    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);
316

    
317
    return -1;
318
}
319

    
320
/**
321
 * finds the end of the current frame in the bitstream.
322
 * @return the position of the first byte of the next frame, or -1
323
 */
324
int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
325
    int vop_found, i;
326
    uint32_t state;
327

    
328
    vop_found= pc->frame_start_found;
329
    state= pc->state;
330

    
331
    i=0;
332
    if(!vop_found){
333
        for(i=0; i<buf_size; i++){
334
            state= (state<<8) | buf[i];
335
            if(state == 0x1B6){
336
                i++;
337
                vop_found=1;
338
                break;
339
            }
340
        }
341
    }
342

    
343
    if(vop_found){
344
        /* EOF considered as end of frame */
345
        if (buf_size == 0)
346
            return 0;
347
        for(; i<buf_size; i++){
348
            state= (state<<8) | buf[i];
349
            if((state&0xFFFFFF00) == 0x100){
350
                pc->frame_start_found=0;
351
                pc->state=-1;
352
                return i-3;
353
            }
354
        }
355
    }
356
    pc->frame_start_found= vop_found;
357
    pc->state= state;
358
    return END_NOT_FOUND;
359
}
360

    
361
static int h263_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
362
    int vop_found, i;
363
    uint32_t state;
364

    
365
    vop_found= pc->frame_start_found;
366
    state= pc->state;
367

    
368
    i=0;
369
    if(!vop_found){
370
        for(i=0; i<buf_size; i++){
371
            state= (state<<8) | buf[i];
372
            if(state>>(32-22) == 0x20){
373
                i++;
374
                vop_found=1;
375
                break;
376
            }
377
        }
378
    }
379

    
380
    if(vop_found){
381
      for(; i<buf_size; i++){
382
        state= (state<<8) | buf[i];
383
        if(state>>(32-22) == 0x20){
384
            pc->frame_start_found=0;
385
            pc->state=-1;
386
            return i-3;
387
        }
388
      }
389
    }
390
    pc->frame_start_found= vop_found;
391
    pc->state= state;
392

    
393
    return END_NOT_FOUND;
394
}
395

    
396
#ifdef CONFIG_H263_PARSER
397
static int h263_parse(AVCodecParserContext *s,
398
                           AVCodecContext *avctx,
399
                           const uint8_t **poutbuf, int *poutbuf_size,
400
                           const uint8_t *buf, int buf_size)
401
{
402
    ParseContext *pc = s->priv_data;
403
    int next;
404

    
405
    next= h263_find_frame_end(pc, buf, buf_size);
406

    
407
    if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
408
        *poutbuf = NULL;
409
        *poutbuf_size = 0;
410
        return buf_size;
411
    }
412

    
413
    *poutbuf = buf;
414
    *poutbuf_size = buf_size;
415
    return next;
416
}
417
#endif
418

    
419
int ff_h263_decode_frame(AVCodecContext *avctx,
420
                             void *data, int *data_size,
421
                             uint8_t *buf, int buf_size)
422
{
423
    MpegEncContext *s = avctx->priv_data;
424
    int ret;
425
    AVFrame *pict = data;
426

    
427
#ifdef PRINT_FRAME_TIME
428
uint64_t time= rdtsc();
429
#endif
430
#ifdef DEBUG
431
    av_log(avctx, AV_LOG_DEBUG, "*****frame %d size=%d\n", avctx->frame_number, buf_size);
432
    if(buf_size>0)
433
        av_log(avctx, AV_LOG_DEBUG, "bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
434
#endif
435
    s->flags= avctx->flags;
436
    s->flags2= avctx->flags2;
437

    
438
    /* no supplementary picture */
439
    if (buf_size == 0) {
440
        /* special case for last picture */
441
        if (s->low_delay==0 && s->next_picture_ptr) {
442
            *pict= *(AVFrame*)s->next_picture_ptr;
443
            s->next_picture_ptr= NULL;
444

    
445
            *data_size = sizeof(AVFrame);
446
        }
447

    
448
        return 0;
449
    }
450

    
451
    if(s->flags&CODEC_FLAG_TRUNCATED){
452
        int next;
453

    
454
        if(s->codec_id==CODEC_ID_MPEG4){
455
            next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
456
        }else if(s->codec_id==CODEC_ID_H263){
457
            next= h263_find_frame_end(&s->parse_context, buf, buf_size);
458
        }else{
459
            av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
460
            return -1;
461
        }
462

    
463
        if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
464
            return buf_size;
465
    }
466

    
467

    
468
retry:
469

    
470
    if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
471
        init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
472
    }else
473
        init_get_bits(&s->gb, buf, buf_size*8);
474
    s->bitstream_buffer_size=0;
475

    
476
    if (!s->context_initialized) {
477
        if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
478
            return -1;
479
    }
480

    
481
    //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
482
    if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
483
        int i= ff_find_unused_picture(s, 0);
484
        s->current_picture_ptr= &s->picture[i];
485
    }
486

    
487
    /* let's go :-) */
488
    if (s->msmpeg4_version==5) {
489
        ret= ff_wmv2_decode_picture_header(s);
490
    } else if (s->msmpeg4_version) {
491
        ret = msmpeg4_decode_picture_header(s);
492
    } else if (s->h263_pred) {
493
        if(s->avctx->extradata_size && s->picture_number==0){
494
            GetBitContext gb;
495

    
496
            init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
497
            ret = ff_mpeg4_decode_picture_header(s, &gb);
498
        }
499
        ret = ff_mpeg4_decode_picture_header(s, &s->gb);
500

    
501
        if(s->flags& CODEC_FLAG_LOW_DELAY)
502
            s->low_delay=1;
503
    } else if (s->codec_id == CODEC_ID_H263I) {
504
        ret = intel_h263_decode_picture_header(s);
505
    } else if (s->h263_flv) {
506
        ret = flv_h263_decode_picture_header(s);
507
    } else {
508
        ret = h263_decode_picture_header(s);
509
    }
510

    
511
    if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
512

    
513
    /* skip if the header was thrashed */
514
    if (ret < 0){
515
        av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
516
        return -1;
517
    }
518

    
519
    avctx->has_b_frames= !s->low_delay;
520

    
521
    if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
522
        if(s->stream_codec_tag == ff_get_fourcc("XVID") ||
523
           s->codec_tag == ff_get_fourcc("XVID") || s->codec_tag == ff_get_fourcc("XVIX") ||
524
           s->codec_tag == ff_get_fourcc("RMP4"))
525
            s->xvid_build= -1;
526
#if 0
527
        if(s->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
528
           && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
529
            s->xvid_build= -1;
530
#endif
531
    }
532

    
533
    if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
534
        if(s->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
535
            s->divx_version= 400; //divx 4
536
    }
537

    
538
    if(s->xvid_build && s->divx_version){
539
        s->divx_version=
540
        s->divx_build= 0;
541
    }
542

    
543
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
544
        if(s->codec_tag == ff_get_fourcc("XVIX"))
545
            s->workaround_bugs|= FF_BUG_XVID_ILACE;
546

    
547
        if(s->codec_tag == ff_get_fourcc("UMP4")){
548
            s->workaround_bugs|= FF_BUG_UMP4;
549
        }
550

    
551
        if(s->divx_version>=500){
552
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
553
        }
554

    
555
        if(s->divx_version>502){
556
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
557
        }
558

    
559
        if(s->xvid_build && s->xvid_build<=3)
560
            s->padding_bug_score= 256*256*256*64;
561

    
562
        if(s->xvid_build && s->xvid_build<=1)
563
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
564

    
565
        if(s->xvid_build && s->xvid_build<=12)
566
            s->workaround_bugs|= FF_BUG_EDGE;
567

    
568
        if(s->xvid_build && s->xvid_build<=32)
569
            s->workaround_bugs|= FF_BUG_DC_CLIP;
570

    
571
#define SET_QPEL_FUNC(postfix1, postfix2) \
572
    s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
573
    s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
574
    s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
575

    
576
        if(s->lavc_build && s->lavc_build<4653)
577
            s->workaround_bugs|= FF_BUG_STD_QPEL;
578

    
579
        if(s->lavc_build && s->lavc_build<4655)
580
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
581

    
582
        if(s->lavc_build && s->lavc_build<4670){
583
            s->workaround_bugs|= FF_BUG_EDGE;
584
        }
585

    
586
        if(s->lavc_build && s->lavc_build<=4712)
587
            s->workaround_bugs|= FF_BUG_DC_CLIP;
588

    
589
        if(s->divx_version)
590
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
591
//printf("padding_bug_score: %d\n", s->padding_bug_score);
592
        if(s->divx_version==501 && s->divx_build==20020416)
593
            s->padding_bug_score= 256*256*256*64;
594

    
595
        if(s->divx_version && s->divx_version<500){
596
            s->workaround_bugs|= FF_BUG_EDGE;
597
        }
598

    
599
        if(s->divx_version)
600
            s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
601
#if 0
602
        if(s->divx_version==500)
603
            s->padding_bug_score= 256*256*256*64;
604

605
        /* very ugly XVID padding bug detection FIXME/XXX solve this differently
606
         * lets hope this at least works
607
         */
608
        if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
609
           && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
610
            s->workaround_bugs|= FF_BUG_NO_PADDING;
611

612
        if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
613
            s->workaround_bugs|= FF_BUG_NO_PADDING;
614
#endif
615
    }
616

    
617
    if(s->workaround_bugs& FF_BUG_STD_QPEL){
618
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
619
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
620
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
621
        SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
622
        SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
623
        SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
624

    
625
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
626
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
627
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
628
        SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
629
        SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
630
        SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
631
    }
632

    
633
    if(avctx->debug & FF_DEBUG_BUGS)
634
        av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
635
               s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
636
               s->divx_packed ? "p" : "");
637

    
638
#if 0 // dump bits per frame / qp / complexity
639
{
640
    static FILE *f=NULL;
641
    if(!f) f=fopen("rate_qp_cplx.txt", "w");
642
    fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
643
}
644
#endif
645

    
646
#if defined(HAVE_MMX) && defined(CONFIG_GPL)
647
    if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & MM_MMX)){
648
        avctx->idct_algo= FF_IDCT_XVIDMMX;
649
        avctx->coded_width= 0; // force reinit
650
//        dsputil_init(&s->dsp, avctx);
651
        s->picture_number=0;
652
    }
653
#endif
654

    
655
        /* After H263 & mpeg4 header decode we have the height, width,*/
656
        /* and other parameters. So then we could init the picture   */
657
        /* FIXME: By the way H263 decoder is evolving it should have */
658
        /* an H263EncContext                                         */
659

    
660
    if (   s->width  != avctx->coded_width
661
        || s->height != avctx->coded_height) {
662
        /* H.263 could change picture size any time */
663
        ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
664
        s->parse_context.buffer=0;
665
        MPV_common_end(s);
666
        s->parse_context= pc;
667
    }
668
    if (!s->context_initialized) {
669
        avcodec_set_dimensions(avctx, s->width, s->height);
670

    
671
        goto retry;
672
    }
673

    
674
    if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
675
        s->gob_index = ff_h263_get_gob_height(s);
676

    
677
    // for hurry_up==5
678
    s->current_picture.pict_type= s->pict_type;
679
    s->current_picture.key_frame= s->pict_type == I_TYPE;
680

    
681
    /* skip B-frames if we don't have reference frames */
682
    if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
683
    /* skip b frames if we are in a hurry */
684
    if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
685
    if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)
686
       || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)
687
       ||  avctx->skip_frame >= AVDISCARD_ALL)
688
        return get_consumed_bytes(s, buf_size);
689
    /* skip everything if we are in a hurry>=5 */
690
    if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
691

    
692
    if(s->next_p_frame_damaged){
693
        if(s->pict_type==B_TYPE)
694
            return get_consumed_bytes(s, buf_size);
695
        else
696
            s->next_p_frame_damaged=0;
697
    }
698

    
699
    if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==B_TYPE){
700
        s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
701
        s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
702
    }else if((!s->no_rounding) || s->pict_type==B_TYPE){
703
        s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
704
        s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
705
    }else{
706
        s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
707
        s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
708
    }
709

    
710
    if(MPV_frame_start(s, avctx) < 0)
711
        return -1;
712

    
713
#ifdef DEBUG
714
    av_log(avctx, AV_LOG_DEBUG, "qscale=%d\n", s->qscale);
715
#endif
716

    
717
    ff_er_frame_start(s);
718

    
719
    //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
720
    //which isnt available before MPV_frame_start()
721
    if (s->msmpeg4_version==5){
722
        if(ff_wmv2_decode_secondary_picture_header(s) < 0)
723
            return -1;
724
    }
725

    
726
    /* decode each macroblock */
727
    s->mb_x=0;
728
    s->mb_y=0;
729

    
730
    decode_slice(s);
731
    while(s->mb_y<s->mb_height){
732
        if(s->msmpeg4_version){
733
            if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
734
                break;
735
        }else{
736
            if(ff_h263_resync(s)<0)
737
                break;
738
        }
739

    
740
        if(s->msmpeg4_version<4 && s->h263_pred)
741
            ff_mpeg4_clean_buffers(s);
742

    
743
        decode_slice(s);
744
    }
745

    
746
    if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
747
        if(msmpeg4_decode_ext_header(s, buf_size) < 0){
748
            s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
749
        }
750

    
751
    /* divx 5.01+ bistream reorder stuff */
752
    if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
753
        int current_pos= get_bits_count(&s->gb)>>3;
754
        int startcode_found=0;
755

    
756
        if(buf_size - current_pos > 5){
757
            int i;
758
            for(i=current_pos; i<buf_size-3; i++){
759
                if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
760
                    startcode_found=1;
761
                    break;
762
                }
763
            }
764
        }
765
        if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
766
            startcode_found=1;
767
            current_pos=0;
768
        }
769

    
770
        if(startcode_found){
771
            s->bitstream_buffer= av_fast_realloc(
772
                s->bitstream_buffer,
773
                &s->allocated_bitstream_buffer_size,
774
                buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
775
            memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
776
            s->bitstream_buffer_size= buf_size - current_pos;
777
        }
778
    }
779

    
780
    ff_er_frame_end(s);
781

    
782
    MPV_frame_end(s);
783

    
784
assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
785
assert(s->current_picture.pict_type == s->pict_type);
786
    if (s->pict_type == B_TYPE || s->low_delay) {
787
        *pict= *(AVFrame*)s->current_picture_ptr;
788
    } else if (s->last_picture_ptr != NULL) {
789
        *pict= *(AVFrame*)s->last_picture_ptr;
790
    }
791

    
792
    if(s->last_picture_ptr || s->low_delay){
793
        *data_size = sizeof(AVFrame);
794
        ff_print_debug_info(s, pict);
795
    }
796

    
797
    /* Return the Picture timestamp as the frame number */
798
    /* we substract 1 because it is added on utils.c    */
799
    avctx->frame_number = s->picture_number - 1;
800

    
801
#ifdef PRINT_FRAME_TIME
802
av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
803
#endif
804

    
805
    return get_consumed_bytes(s, buf_size);
806
}
807

    
808
AVCodec mpeg4_decoder = {
809
    "mpeg4",
810
    CODEC_TYPE_VIDEO,
811
    CODEC_ID_MPEG4,
812
    sizeof(MpegEncContext),
813
    ff_h263_decode_init,
814
    NULL,
815
    ff_h263_decode_end,
816
    ff_h263_decode_frame,
817
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
818
    .flush= ff_mpeg_flush,
819
};
820

    
821
AVCodec h263_decoder = {
822
    "h263",
823
    CODEC_TYPE_VIDEO,
824
    CODEC_ID_H263,
825
    sizeof(MpegEncContext),
826
    ff_h263_decode_init,
827
    NULL,
828
    ff_h263_decode_end,
829
    ff_h263_decode_frame,
830
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
831
    .flush= ff_mpeg_flush,
832
};
833

    
834
AVCodec msmpeg4v1_decoder = {
835
    "msmpeg4v1",
836
    CODEC_TYPE_VIDEO,
837
    CODEC_ID_MSMPEG4V1,
838
    sizeof(MpegEncContext),
839
    ff_h263_decode_init,
840
    NULL,
841
    ff_h263_decode_end,
842
    ff_h263_decode_frame,
843
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
844
};
845

    
846
AVCodec msmpeg4v2_decoder = {
847
    "msmpeg4v2",
848
    CODEC_TYPE_VIDEO,
849
    CODEC_ID_MSMPEG4V2,
850
    sizeof(MpegEncContext),
851
    ff_h263_decode_init,
852
    NULL,
853
    ff_h263_decode_end,
854
    ff_h263_decode_frame,
855
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
856
};
857

    
858
AVCodec msmpeg4v3_decoder = {
859
    "msmpeg4",
860
    CODEC_TYPE_VIDEO,
861
    CODEC_ID_MSMPEG4V3,
862
    sizeof(MpegEncContext),
863
    ff_h263_decode_init,
864
    NULL,
865
    ff_h263_decode_end,
866
    ff_h263_decode_frame,
867
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
868
};
869

    
870
AVCodec wmv1_decoder = {
871
    "wmv1",
872
    CODEC_TYPE_VIDEO,
873
    CODEC_ID_WMV1,
874
    sizeof(MpegEncContext),
875
    ff_h263_decode_init,
876
    NULL,
877
    ff_h263_decode_end,
878
    ff_h263_decode_frame,
879
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
880
};
881

    
882
AVCodec h263i_decoder = {
883
    "h263i",
884
    CODEC_TYPE_VIDEO,
885
    CODEC_ID_H263I,
886
    sizeof(MpegEncContext),
887
    ff_h263_decode_init,
888
    NULL,
889
    ff_h263_decode_end,
890
    ff_h263_decode_frame,
891
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
892
};
893

    
894
AVCodec flv_decoder = {
895
    "flv",
896
    CODEC_TYPE_VIDEO,
897
    CODEC_ID_FLV1,
898
    sizeof(MpegEncContext),
899
    ff_h263_decode_init,
900
    NULL,
901
    ff_h263_decode_end,
902
    ff_h263_decode_frame,
903
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
904
};
905

    
906
#ifdef CONFIG_H263_PARSER
907
AVCodecParser h263_parser = {
908
    { CODEC_ID_H263 },
909
    sizeof(ParseContext),
910
    NULL,
911
    h263_parse,
912
    ff_parse_close,
913
};
914
#endif