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ffmpeg / libavcodec / h263dec.c @ c33d9814

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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
#include "h263_parser.h"
32

    
33
//#define DEBUG
34
//#define PRINT_FRAME_TIME
35

    
36
int ff_h263_decode_init(AVCodecContext *avctx)
37
{
38
    MpegEncContext *s = avctx->priv_data;
39

    
40
    s->avctx = avctx;
41
    s->out_format = FMT_H263;
42

    
43
    s->width  = avctx->coded_width;
44
    s->height = avctx->coded_height;
45
    s->workaround_bugs= avctx->workaround_bugs;
46

    
47
    // set defaults
48
    MPV_decode_defaults(s);
49
    s->quant_precision=5;
50
    s->decode_mb= ff_h263_decode_mb;
51
    s->low_delay= 1;
52
    avctx->pix_fmt= PIX_FMT_YUV420P;
53
    s->unrestricted_mv= 1;
54

    
55
    /* select sub codec */
56
    switch(avctx->codec->id) {
57
    case CODEC_ID_H263:
58
        s->unrestricted_mv= 0;
59
        break;
60
    case CODEC_ID_MPEG4:
61
        s->decode_mb= ff_mpeg4_decode_mb;
62
        s->time_increment_bits = 4; /* default value for broken headers */
63
        s->h263_pred = 1;
64
        s->low_delay = 0; //default, might be overriden in the vol header during header parsing
65
        break;
66
    case CODEC_ID_MSMPEG4V1:
67
        s->h263_msmpeg4 = 1;
68
        s->h263_pred = 1;
69
        s->msmpeg4_version=1;
70
        break;
71
    case CODEC_ID_MSMPEG4V2:
72
        s->h263_msmpeg4 = 1;
73
        s->h263_pred = 1;
74
        s->msmpeg4_version=2;
75
        break;
76
    case CODEC_ID_MSMPEG4V3:
77
        s->h263_msmpeg4 = 1;
78
        s->h263_pred = 1;
79
        s->msmpeg4_version=3;
80
        break;
81
    case CODEC_ID_WMV1:
82
        s->h263_msmpeg4 = 1;
83
        s->h263_pred = 1;
84
        s->msmpeg4_version=4;
85
        break;
86
    case CODEC_ID_WMV2:
87
        s->h263_msmpeg4 = 1;
88
        s->h263_pred = 1;
89
        s->msmpeg4_version=5;
90
        break;
91
    case CODEC_ID_VC1:
92
    case CODEC_ID_WMV3:
93
        s->h263_msmpeg4 = 1;
94
        s->h263_pred = 1;
95
        s->msmpeg4_version=6;
96
        break;
97
    case CODEC_ID_H263I:
98
        break;
99
    case CODEC_ID_FLV1:
100
        s->h263_flv = 1;
101
        break;
102
    default:
103
        return -1;
104
    }
105
    s->codec_id= avctx->codec->id;
106

    
107
    /* for h263, we allocate the images after having read the header */
108
    if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
109
        if (MPV_common_init(s) < 0)
110
            return -1;
111

    
112
    if (s->h263_msmpeg4)
113
        ff_msmpeg4_decode_init(s);
114
    else
115
        h263_decode_init_vlc(s);
116

    
117
    return 0;
118
}
119

    
120
int ff_h263_decode_end(AVCodecContext *avctx)
121
{
122
    MpegEncContext *s = avctx->priv_data;
123

    
124
    MPV_common_end(s);
125
    return 0;
126
}
127

    
128
/**
129
 * returns the number of bytes consumed for building the current frame
130
 */
131
static int get_consumed_bytes(MpegEncContext *s, int buf_size){
132
    int pos= (get_bits_count(&s->gb)+7)>>3;
133

    
134
    if(s->divx_packed){
135
        //we would have to scan through the whole buf to handle the weird reordering ...
136
        return buf_size;
137
    }else if(s->flags&CODEC_FLAG_TRUNCATED){
138
        pos -= s->parse_context.last_index;
139
        if(pos<0) pos=0; // padding is not really read so this might be -1
140
        return pos;
141
    }else{
142
        if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
143
        if(pos+10>buf_size) pos=buf_size; // oops ;)
144

    
145
        return pos;
146
    }
147
}
148

    
149
static int decode_slice(MpegEncContext *s){
150
    const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
151
    const int mb_size= 16>>s->avctx->lowres;
152
    s->last_resync_gb= s->gb;
153
    s->first_slice_line= 1;
154

    
155
    s->resync_mb_x= s->mb_x;
156
    s->resync_mb_y= s->mb_y;
157

    
158
    ff_set_qscale(s, s->qscale);
159

    
160
    if(s->partitioned_frame){
161
        const int qscale= s->qscale;
162

    
163
        if(s->codec_id==CODEC_ID_MPEG4){
164
            if(ff_mpeg4_decode_partitions(s) < 0)
165
                return -1;
166
        }
167

    
168
        /* restore variables which were modified */
169
        s->first_slice_line=1;
170
        s->mb_x= s->resync_mb_x;
171
        s->mb_y= s->resync_mb_y;
172
        ff_set_qscale(s, qscale);
173
    }
174

    
175
    for(; s->mb_y < s->mb_height; s->mb_y++) {
176
        /* per-row end of slice checks */
177
        if(s->msmpeg4_version){
178
            if(s->resync_mb_y + s->slice_height == s->mb_y){
179
                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);
180

    
181
                return 0;
182
            }
183
        }
184

    
185
        if(s->msmpeg4_version==1){
186
            s->last_dc[0]=
187
            s->last_dc[1]=
188
            s->last_dc[2]= 128;
189
        }
190

    
191
        ff_init_block_index(s);
192
        for(; s->mb_x < s->mb_width; s->mb_x++) {
193
            int ret;
194

    
195
            ff_update_block_index(s);
196

    
197
            if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
198
                s->first_slice_line=0;
199
            }
200

    
201
            /* DCT & quantize */
202

    
203
            s->mv_dir = MV_DIR_FORWARD;
204
            s->mv_type = MV_TYPE_16X16;
205
//            s->mb_skipped = 0;
206
//printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
207
            ret= s->decode_mb(s, s->block);
208

    
209
            if (s->pict_type!=B_TYPE)
210
                ff_h263_update_motion_val(s);
211

    
212
            if(ret<0){
213
                const int xy= s->mb_x + s->mb_y*s->mb_stride;
214
                if(ret==SLICE_END){
215
                    MPV_decode_mb(s, s->block);
216
                    if(s->loop_filter)
217
                        ff_h263_loop_filter(s);
218

    
219
//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));
220
                    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);
221

    
222
                    s->padding_bug_score--;
223

    
224
                    if(++s->mb_x >= s->mb_width){
225
                        s->mb_x=0;
226
                        ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
227
                        s->mb_y++;
228
                    }
229
                    return 0;
230
                }else if(ret==SLICE_NOEND){
231
                    av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
232
                    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);
233
                    return -1;
234
                }
235
                av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
236
                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);
237

    
238
                return -1;
239
            }
240

    
241
            MPV_decode_mb(s, s->block);
242
            if(s->loop_filter)
243
                ff_h263_loop_filter(s);
244
        }
245

    
246
        ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
247

    
248
        s->mb_x= 0;
249
    }
250

    
251
    assert(s->mb_x==0 && s->mb_y==s->mb_height);
252

    
253
    /* try to detect the padding bug */
254
    if(      s->codec_id==CODEC_ID_MPEG4
255
       &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
256
       &&    s->gb.size_in_bits - get_bits_count(&s->gb) >=0
257
       &&    s->gb.size_in_bits - get_bits_count(&s->gb) < 48
258
//       &&   !s->resync_marker
259
       &&   !s->data_partitioning){
260

    
261
        const int bits_count= get_bits_count(&s->gb);
262
        const int bits_left = s->gb.size_in_bits - bits_count;
263

    
264
        if(bits_left==0){
265
            s->padding_bug_score+=16;
266
        } else if(bits_left != 1){
267
            int v= show_bits(&s->gb, 8);
268
            v|= 0x7F >> (7-(bits_count&7));
269

    
270
            if(v==0x7F && bits_left<=8)
271
                s->padding_bug_score--;
272
            else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
273
                s->padding_bug_score+= 4;
274
            else
275
                s->padding_bug_score++;
276
        }
277
    }
278

    
279
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
280
        if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version || !s->resync_marker)*/)
281
            s->workaround_bugs |=  FF_BUG_NO_PADDING;
282
        else
283
            s->workaround_bugs &= ~FF_BUG_NO_PADDING;
284
    }
285

    
286
    // handle formats which don't have unique end markers
287
    if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
288
        int left= s->gb.size_in_bits - get_bits_count(&s->gb);
289
        int max_extra=7;
290

    
291
        /* no markers in M$ crap */
292
        if(s->msmpeg4_version && s->pict_type==I_TYPE)
293
            max_extra+= 17;
294

    
295
        /* buggy padding but the frame should still end approximately at the bitstream end */
296
        if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_resilience>=3)
297
            max_extra+= 48;
298
        else if((s->workaround_bugs&FF_BUG_NO_PADDING))
299
            max_extra+= 256*256*256*64;
300

    
301
        if(left>max_extra){
302
            av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
303
        }
304
        else if(left<0){
305
            av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
306
        }else
307
            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);
308

    
309
        return 0;
310
    }
311

    
312
    av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
313
            s->gb.size_in_bits - get_bits_count(&s->gb),
314
            show_bits(&s->gb, 24), s->padding_bug_score);
315

    
316
    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);
317

    
318
    return -1;
319
}
320

    
321
/**
322
 * finds the end of the current frame in the bitstream.
323
 * @return the position of the first byte of the next frame, or -1
324
 */
325
int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
326
    int vop_found, i;
327
    uint32_t state;
328

    
329
    vop_found= pc->frame_start_found;
330
    state= pc->state;
331

    
332
    i=0;
333
    if(!vop_found){
334
        for(i=0; i<buf_size; i++){
335
            state= (state<<8) | buf[i];
336
            if(state == 0x1B6){
337
                i++;
338
                vop_found=1;
339
                break;
340
            }
341
        }
342
    }
343

    
344
    if(vop_found){
345
        /* EOF considered as end of frame */
346
        if (buf_size == 0)
347
            return 0;
348
        for(; i<buf_size; i++){
349
            state= (state<<8) | buf[i];
350
            if((state&0xFFFFFF00) == 0x100){
351
                pc->frame_start_found=0;
352
                pc->state=-1;
353
                return i-3;
354
            }
355
        }
356
    }
357
    pc->frame_start_found= vop_found;
358
    pc->state= state;
359
    return END_NOT_FOUND;
360
}
361

    
362
int ff_h263_decode_frame(AVCodecContext *avctx,
363
                             void *data, int *data_size,
364
                             uint8_t *buf, int buf_size)
365
{
366
    MpegEncContext *s = avctx->priv_data;
367
    int ret;
368
    AVFrame *pict = data;
369

    
370
#ifdef PRINT_FRAME_TIME
371
uint64_t time= rdtsc();
372
#endif
373
#ifdef DEBUG
374
    av_log(avctx, AV_LOG_DEBUG, "*****frame %d size=%d\n", avctx->frame_number, buf_size);
375
    if(buf_size>0)
376
        av_log(avctx, AV_LOG_DEBUG, "bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
377
#endif
378
    s->flags= avctx->flags;
379
    s->flags2= avctx->flags2;
380

    
381
    /* no supplementary picture */
382
    if (buf_size == 0) {
383
        /* special case for last picture */
384
        if (s->low_delay==0 && s->next_picture_ptr) {
385
            *pict= *(AVFrame*)s->next_picture_ptr;
386
            s->next_picture_ptr= NULL;
387

    
388
            *data_size = sizeof(AVFrame);
389
        }
390

    
391
        return 0;
392
    }
393

    
394
    if(s->flags&CODEC_FLAG_TRUNCATED){
395
        int next;
396

    
397
        if(s->codec_id==CODEC_ID_MPEG4){
398
            next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
399
        }else if(s->codec_id==CODEC_ID_H263){
400
            next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
401
        }else{
402
            av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
403
            return -1;
404
        }
405

    
406
        if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
407
            return buf_size;
408
    }
409

    
410

    
411
retry:
412

    
413
    if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
414
        init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
415
    }else
416
        init_get_bits(&s->gb, buf, buf_size*8);
417
    s->bitstream_buffer_size=0;
418

    
419
    if (!s->context_initialized) {
420
        if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
421
            return -1;
422
    }
423

    
424
    //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
425
    if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
426
        int i= ff_find_unused_picture(s, 0);
427
        s->current_picture_ptr= &s->picture[i];
428
    }
429

    
430
    /* let's go :-) */
431
    if (s->msmpeg4_version==5) {
432
        ret= ff_wmv2_decode_picture_header(s);
433
    } else if (s->msmpeg4_version) {
434
        ret = msmpeg4_decode_picture_header(s);
435
    } else if (s->h263_pred) {
436
        if(s->avctx->extradata_size && s->picture_number==0){
437
            GetBitContext gb;
438

    
439
            init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
440
            ret = ff_mpeg4_decode_picture_header(s, &gb);
441
        }
442
        ret = ff_mpeg4_decode_picture_header(s, &s->gb);
443

    
444
        if(s->flags& CODEC_FLAG_LOW_DELAY)
445
            s->low_delay=1;
446
    } else if (s->codec_id == CODEC_ID_H263I) {
447
        ret = intel_h263_decode_picture_header(s);
448
    } else if (s->h263_flv) {
449
        ret = flv_h263_decode_picture_header(s);
450
    } else {
451
        ret = h263_decode_picture_header(s);
452
    }
453

    
454
    if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
455

    
456
    /* skip if the header was thrashed */
457
    if (ret < 0){
458
        av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
459
        return -1;
460
    }
461

    
462
    avctx->has_b_frames= !s->low_delay;
463

    
464
    if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
465
        if(s->stream_codec_tag == ff_get_fourcc("XVID") ||
466
           s->codec_tag == ff_get_fourcc("XVID") || s->codec_tag == ff_get_fourcc("XVIX") ||
467
           s->codec_tag == ff_get_fourcc("RMP4"))
468
            s->xvid_build= -1;
469
#if 0
470
        if(s->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
471
           && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
472
            s->xvid_build= -1;
473
#endif
474
    }
475

    
476
    if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
477
        if(s->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
478
            s->divx_version= 400; //divx 4
479
    }
480

    
481
    if(s->xvid_build && s->divx_version){
482
        s->divx_version=
483
        s->divx_build= 0;
484
    }
485

    
486
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
487
        if(s->codec_tag == ff_get_fourcc("XVIX"))
488
            s->workaround_bugs|= FF_BUG_XVID_ILACE;
489

    
490
        if(s->codec_tag == ff_get_fourcc("UMP4")){
491
            s->workaround_bugs|= FF_BUG_UMP4;
492
        }
493

    
494
        if(s->divx_version>=500){
495
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
496
        }
497

    
498
        if(s->divx_version>502){
499
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
500
        }
501

    
502
        if(s->xvid_build && s->xvid_build<=3)
503
            s->padding_bug_score= 256*256*256*64;
504

    
505
        if(s->xvid_build && s->xvid_build<=1)
506
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
507

    
508
        if(s->xvid_build && s->xvid_build<=12)
509
            s->workaround_bugs|= FF_BUG_EDGE;
510

    
511
        if(s->xvid_build && s->xvid_build<=32)
512
            s->workaround_bugs|= FF_BUG_DC_CLIP;
513

    
514
#define SET_QPEL_FUNC(postfix1, postfix2) \
515
    s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
516
    s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
517
    s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
518

    
519
        if(s->lavc_build && s->lavc_build<4653)
520
            s->workaround_bugs|= FF_BUG_STD_QPEL;
521

    
522
        if(s->lavc_build && s->lavc_build<4655)
523
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
524

    
525
        if(s->lavc_build && s->lavc_build<4670){
526
            s->workaround_bugs|= FF_BUG_EDGE;
527
        }
528

    
529
        if(s->lavc_build && s->lavc_build<=4712)
530
            s->workaround_bugs|= FF_BUG_DC_CLIP;
531

    
532
        if(s->divx_version)
533
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
534
//printf("padding_bug_score: %d\n", s->padding_bug_score);
535
        if(s->divx_version==501 && s->divx_build==20020416)
536
            s->padding_bug_score= 256*256*256*64;
537

    
538
        if(s->divx_version && s->divx_version<500){
539
            s->workaround_bugs|= FF_BUG_EDGE;
540
        }
541

    
542
        if(s->divx_version)
543
            s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
544
#if 0
545
        if(s->divx_version==500)
546
            s->padding_bug_score= 256*256*256*64;
547

548
        /* very ugly XVID padding bug detection FIXME/XXX solve this differently
549
         * lets hope this at least works
550
         */
551
        if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
552
           && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
553
            s->workaround_bugs|= FF_BUG_NO_PADDING;
554

555
        if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
556
            s->workaround_bugs|= FF_BUG_NO_PADDING;
557
#endif
558
    }
559

    
560
    if(s->workaround_bugs& FF_BUG_STD_QPEL){
561
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
562
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
563
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
564
        SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
565
        SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
566
        SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
567

    
568
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
569
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
570
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
571
        SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
572
        SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
573
        SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
574
    }
575

    
576
    if(avctx->debug & FF_DEBUG_BUGS)
577
        av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
578
               s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
579
               s->divx_packed ? "p" : "");
580

    
581
#if 0 // dump bits per frame / qp / complexity
582
{
583
    static FILE *f=NULL;
584
    if(!f) f=fopen("rate_qp_cplx.txt", "w");
585
    fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
586
}
587
#endif
588

    
589
#if defined(HAVE_MMX) && defined(CONFIG_GPL)
590
    if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & MM_MMX)){
591
        avctx->idct_algo= FF_IDCT_XVIDMMX;
592
        avctx->coded_width= 0; // force reinit
593
//        dsputil_init(&s->dsp, avctx);
594
        s->picture_number=0;
595
    }
596
#endif
597

    
598
        /* After H263 & mpeg4 header decode we have the height, width,*/
599
        /* and other parameters. So then we could init the picture   */
600
        /* FIXME: By the way H263 decoder is evolving it should have */
601
        /* an H263EncContext                                         */
602

    
603
    if (   s->width  != avctx->coded_width
604
        || s->height != avctx->coded_height) {
605
        /* H.263 could change picture size any time */
606
        ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
607
        s->parse_context.buffer=0;
608
        MPV_common_end(s);
609
        s->parse_context= pc;
610
    }
611
    if (!s->context_initialized) {
612
        avcodec_set_dimensions(avctx, s->width, s->height);
613

    
614
        goto retry;
615
    }
616

    
617
    if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
618
        s->gob_index = ff_h263_get_gob_height(s);
619

    
620
    // for hurry_up==5
621
    s->current_picture.pict_type= s->pict_type;
622
    s->current_picture.key_frame= s->pict_type == I_TYPE;
623

    
624
    /* skip B-frames if we don't have reference frames */
625
    if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
626
    /* skip b frames if we are in a hurry */
627
    if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
628
    if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)
629
       || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)
630
       ||  avctx->skip_frame >= AVDISCARD_ALL)
631
        return get_consumed_bytes(s, buf_size);
632
    /* skip everything if we are in a hurry>=5 */
633
    if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
634

    
635
    if(s->next_p_frame_damaged){
636
        if(s->pict_type==B_TYPE)
637
            return get_consumed_bytes(s, buf_size);
638
        else
639
            s->next_p_frame_damaged=0;
640
    }
641

    
642
    if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==B_TYPE){
643
        s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
644
        s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
645
    }else if((!s->no_rounding) || s->pict_type==B_TYPE){
646
        s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
647
        s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
648
    }else{
649
        s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
650
        s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
651
    }
652

    
653
    if(MPV_frame_start(s, avctx) < 0)
654
        return -1;
655

    
656
#ifdef DEBUG
657
    av_log(avctx, AV_LOG_DEBUG, "qscale=%d\n", s->qscale);
658
#endif
659

    
660
    ff_er_frame_start(s);
661

    
662
    //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
663
    //which isnt available before MPV_frame_start()
664
    if (s->msmpeg4_version==5){
665
        if(ff_wmv2_decode_secondary_picture_header(s) < 0)
666
            return -1;
667
    }
668

    
669
    /* decode each macroblock */
670
    s->mb_x=0;
671
    s->mb_y=0;
672

    
673
    decode_slice(s);
674
    while(s->mb_y<s->mb_height){
675
        if(s->msmpeg4_version){
676
            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)
677
                break;
678
        }else{
679
            if(ff_h263_resync(s)<0)
680
                break;
681
        }
682

    
683
        if(s->msmpeg4_version<4 && s->h263_pred)
684
            ff_mpeg4_clean_buffers(s);
685

    
686
        decode_slice(s);
687
    }
688

    
689
    if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
690
        if(msmpeg4_decode_ext_header(s, buf_size) < 0){
691
            s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
692
        }
693

    
694
    /* divx 5.01+ bistream reorder stuff */
695
    if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
696
        int current_pos= get_bits_count(&s->gb)>>3;
697
        int startcode_found=0;
698

    
699
        if(buf_size - current_pos > 5){
700
            int i;
701
            for(i=current_pos; i<buf_size-3; i++){
702
                if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
703
                    startcode_found=1;
704
                    break;
705
                }
706
            }
707
        }
708
        if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
709
            startcode_found=1;
710
            current_pos=0;
711
        }
712

    
713
        if(startcode_found){
714
            s->bitstream_buffer= av_fast_realloc(
715
                s->bitstream_buffer,
716
                &s->allocated_bitstream_buffer_size,
717
                buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
718
            memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
719
            s->bitstream_buffer_size= buf_size - current_pos;
720
        }
721
    }
722

    
723
    ff_er_frame_end(s);
724

    
725
    MPV_frame_end(s);
726

    
727
assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
728
assert(s->current_picture.pict_type == s->pict_type);
729
    if (s->pict_type == B_TYPE || s->low_delay) {
730
        *pict= *(AVFrame*)s->current_picture_ptr;
731
    } else if (s->last_picture_ptr != NULL) {
732
        *pict= *(AVFrame*)s->last_picture_ptr;
733
    }
734

    
735
    if(s->last_picture_ptr || s->low_delay){
736
        *data_size = sizeof(AVFrame);
737
        ff_print_debug_info(s, pict);
738
    }
739

    
740
    /* Return the Picture timestamp as the frame number */
741
    /* we substract 1 because it is added on utils.c    */
742
    avctx->frame_number = s->picture_number - 1;
743

    
744
#ifdef PRINT_FRAME_TIME
745
av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
746
#endif
747

    
748
    return get_consumed_bytes(s, buf_size);
749
}
750

    
751
AVCodec mpeg4_decoder = {
752
    "mpeg4",
753
    CODEC_TYPE_VIDEO,
754
    CODEC_ID_MPEG4,
755
    sizeof(MpegEncContext),
756
    ff_h263_decode_init,
757
    NULL,
758
    ff_h263_decode_end,
759
    ff_h263_decode_frame,
760
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
761
    .flush= ff_mpeg_flush,
762
};
763

    
764
AVCodec h263_decoder = {
765
    "h263",
766
    CODEC_TYPE_VIDEO,
767
    CODEC_ID_H263,
768
    sizeof(MpegEncContext),
769
    ff_h263_decode_init,
770
    NULL,
771
    ff_h263_decode_end,
772
    ff_h263_decode_frame,
773
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
774
    .flush= ff_mpeg_flush,
775
};
776

    
777
AVCodec msmpeg4v1_decoder = {
778
    "msmpeg4v1",
779
    CODEC_TYPE_VIDEO,
780
    CODEC_ID_MSMPEG4V1,
781
    sizeof(MpegEncContext),
782
    ff_h263_decode_init,
783
    NULL,
784
    ff_h263_decode_end,
785
    ff_h263_decode_frame,
786
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
787
};
788

    
789
AVCodec msmpeg4v2_decoder = {
790
    "msmpeg4v2",
791
    CODEC_TYPE_VIDEO,
792
    CODEC_ID_MSMPEG4V2,
793
    sizeof(MpegEncContext),
794
    ff_h263_decode_init,
795
    NULL,
796
    ff_h263_decode_end,
797
    ff_h263_decode_frame,
798
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
799
};
800

    
801
AVCodec msmpeg4v3_decoder = {
802
    "msmpeg4",
803
    CODEC_TYPE_VIDEO,
804
    CODEC_ID_MSMPEG4V3,
805
    sizeof(MpegEncContext),
806
    ff_h263_decode_init,
807
    NULL,
808
    ff_h263_decode_end,
809
    ff_h263_decode_frame,
810
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
811
};
812

    
813
AVCodec wmv1_decoder = {
814
    "wmv1",
815
    CODEC_TYPE_VIDEO,
816
    CODEC_ID_WMV1,
817
    sizeof(MpegEncContext),
818
    ff_h263_decode_init,
819
    NULL,
820
    ff_h263_decode_end,
821
    ff_h263_decode_frame,
822
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
823
};
824

    
825
AVCodec h263i_decoder = {
826
    "h263i",
827
    CODEC_TYPE_VIDEO,
828
    CODEC_ID_H263I,
829
    sizeof(MpegEncContext),
830
    ff_h263_decode_init,
831
    NULL,
832
    ff_h263_decode_end,
833
    ff_h263_decode_frame,
834
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
835
};
836

    
837
AVCodec flv_decoder = {
838
    "flv",
839
    CODEC_TYPE_VIDEO,
840
    CODEC_ID_FLV1,
841
    sizeof(MpegEncContext),
842
    ff_h263_decode_init,
843
    NULL,
844
    ff_h263_decode_end,
845
    ff_h263_decode_frame,
846
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
847
};