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ffmpeg / libavcodec / h263dec.c @ 15025553

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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
#include "mpeg4video_parser.h"
33
#include "msmpeg4.h"
34

    
35
//#define DEBUG
36
//#define PRINT_FRAME_TIME
37

    
38
int ff_h263_decode_init(AVCodecContext *avctx)
39
{
40
    MpegEncContext *s = avctx->priv_data;
41

    
42
    s->avctx = avctx;
43
    s->out_format = FMT_H263;
44

    
45
    s->width  = avctx->coded_width;
46
    s->height = avctx->coded_height;
47
    s->workaround_bugs= avctx->workaround_bugs;
48

    
49
    // set defaults
50
    MPV_decode_defaults(s);
51
    s->quant_precision=5;
52
    s->decode_mb= ff_h263_decode_mb;
53
    s->low_delay= 1;
54
    avctx->pix_fmt= PIX_FMT_YUV420P;
55
    s->unrestricted_mv= 1;
56

    
57
    /* select sub codec */
58
    switch(avctx->codec->id) {
59
    case CODEC_ID_H263:
60
        s->unrestricted_mv= 0;
61
        break;
62
    case CODEC_ID_MPEG4:
63
        s->decode_mb= ff_mpeg4_decode_mb;
64
        s->time_increment_bits = 4; /* default value for broken headers */
65
        s->h263_pred = 1;
66
        s->low_delay = 0; //default, might be overriden in the vol header during header parsing
67
        break;
68
    case CODEC_ID_MSMPEG4V1:
69
        s->h263_msmpeg4 = 1;
70
        s->h263_pred = 1;
71
        s->msmpeg4_version=1;
72
        break;
73
    case CODEC_ID_MSMPEG4V2:
74
        s->h263_msmpeg4 = 1;
75
        s->h263_pred = 1;
76
        s->msmpeg4_version=2;
77
        break;
78
    case CODEC_ID_MSMPEG4V3:
79
        s->h263_msmpeg4 = 1;
80
        s->h263_pred = 1;
81
        s->msmpeg4_version=3;
82
        break;
83
    case CODEC_ID_WMV1:
84
        s->h263_msmpeg4 = 1;
85
        s->h263_pred = 1;
86
        s->msmpeg4_version=4;
87
        break;
88
    case CODEC_ID_WMV2:
89
        s->h263_msmpeg4 = 1;
90
        s->h263_pred = 1;
91
        s->msmpeg4_version=5;
92
        break;
93
    case CODEC_ID_VC1:
94
    case CODEC_ID_WMV3:
95
        s->h263_msmpeg4 = 1;
96
        s->h263_pred = 1;
97
        s->msmpeg4_version=6;
98
        break;
99
    case CODEC_ID_H263I:
100
        break;
101
    case CODEC_ID_FLV1:
102
        s->h263_flv = 1;
103
        break;
104
    default:
105
        return -1;
106
    }
107
    s->codec_id= avctx->codec->id;
108

    
109
    /* for h263, we allocate the images after having read the header */
110
    if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
111
        if (MPV_common_init(s) < 0)
112
            return -1;
113

    
114
    if (ENABLE_MSMPEG4_DECODER && s->h263_msmpeg4)
115
        ff_msmpeg4_decode_init(s);
116
    else
117
        h263_decode_init_vlc(s);
118

    
119
    return 0;
120
}
121

    
122
int ff_h263_decode_end(AVCodecContext *avctx)
123
{
124
    MpegEncContext *s = avctx->priv_data;
125

    
126
    MPV_common_end(s);
127
    return 0;
128
}
129

    
130
/**
131
 * returns the number of bytes consumed for building the current frame
132
 */
133
static int get_consumed_bytes(MpegEncContext *s, int buf_size){
134
    int pos= (get_bits_count(&s->gb)+7)>>3;
135

    
136
    if(s->divx_packed){
137
        //we would have to scan through the whole buf to handle the weird reordering ...
138
        return buf_size;
139
    }else if(s->flags&CODEC_FLAG_TRUNCATED){
140
        pos -= s->parse_context.last_index;
141
        if(pos<0) pos=0; // padding is not really read so this might be -1
142
        return pos;
143
    }else{
144
        if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
145
        if(pos+10>buf_size) pos=buf_size; // oops ;)
146

    
147
        return pos;
148
    }
149
}
150

    
151
static int decode_slice(MpegEncContext *s){
152
    const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
153
    const int mb_size= 16>>s->avctx->lowres;
154
    s->last_resync_gb= s->gb;
155
    s->first_slice_line= 1;
156

    
157
    s->resync_mb_x= s->mb_x;
158
    s->resync_mb_y= s->mb_y;
159

    
160
    ff_set_qscale(s, s->qscale);
161

    
162
    if(s->partitioned_frame){
163
        const int qscale= s->qscale;
164

    
165
        if(s->codec_id==CODEC_ID_MPEG4){
166
            if(ff_mpeg4_decode_partitions(s) < 0)
167
                return -1;
168
        }
169

    
170
        /* restore variables which were modified */
171
        s->first_slice_line=1;
172
        s->mb_x= s->resync_mb_x;
173
        s->mb_y= s->resync_mb_y;
174
        ff_set_qscale(s, qscale);
175
    }
176

    
177
    for(; s->mb_y < s->mb_height; s->mb_y++) {
178
        /* per-row end of slice checks */
179
        if(s->msmpeg4_version){
180
            if(s->resync_mb_y + s->slice_height == s->mb_y){
181
                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);
182

    
183
                return 0;
184
            }
185
        }
186

    
187
        if(s->msmpeg4_version==1){
188
            s->last_dc[0]=
189
            s->last_dc[1]=
190
            s->last_dc[2]= 128;
191
        }
192

    
193
        ff_init_block_index(s);
194
        for(; s->mb_x < s->mb_width; s->mb_x++) {
195
            int ret;
196

    
197
            ff_update_block_index(s);
198

    
199
            if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
200
                s->first_slice_line=0;
201
            }
202

    
203
            /* DCT & quantize */
204

    
205
            s->mv_dir = MV_DIR_FORWARD;
206
            s->mv_type = MV_TYPE_16X16;
207
//            s->mb_skipped = 0;
208
//printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
209
            ret= s->decode_mb(s, s->block);
210

    
211
            if (s->pict_type!=B_TYPE)
212
                ff_h263_update_motion_val(s);
213

    
214
            if(ret<0){
215
                const int xy= s->mb_x + s->mb_y*s->mb_stride;
216
                if(ret==SLICE_END){
217
                    MPV_decode_mb(s, s->block);
218
                    if(s->loop_filter)
219
                        ff_h263_loop_filter(s);
220

    
221
//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));
222
                    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);
223

    
224
                    s->padding_bug_score--;
225

    
226
                    if(++s->mb_x >= s->mb_width){
227
                        s->mb_x=0;
228
                        ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
229
                        s->mb_y++;
230
                    }
231
                    return 0;
232
                }else if(ret==SLICE_NOEND){
233
                    av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
234
                    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);
235
                    return -1;
236
                }
237
                av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
238
                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);
239

    
240
                return -1;
241
            }
242

    
243
            MPV_decode_mb(s, s->block);
244
            if(s->loop_filter)
245
                ff_h263_loop_filter(s);
246
        }
247

    
248
        ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
249

    
250
        s->mb_x= 0;
251
    }
252

    
253
    assert(s->mb_x==0 && s->mb_y==s->mb_height);
254

    
255
    /* try to detect the padding bug */
256
    if(      s->codec_id==CODEC_ID_MPEG4
257
       &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
258
       &&    s->gb.size_in_bits - get_bits_count(&s->gb) >=0
259
       &&    s->gb.size_in_bits - get_bits_count(&s->gb) < 48
260
//       &&   !s->resync_marker
261
       &&   !s->data_partitioning){
262

    
263
        const int bits_count= get_bits_count(&s->gb);
264
        const int bits_left = s->gb.size_in_bits - bits_count;
265

    
266
        if(bits_left==0){
267
            s->padding_bug_score+=16;
268
        } else if(bits_left != 1){
269
            int v= show_bits(&s->gb, 8);
270
            v|= 0x7F >> (7-(bits_count&7));
271

    
272
            if(v==0x7F && bits_left<=8)
273
                s->padding_bug_score--;
274
            else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
275
                s->padding_bug_score+= 4;
276
            else
277
                s->padding_bug_score++;
278
        }
279
    }
280

    
281
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
282
        if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version || !s->resync_marker)*/)
283
            s->workaround_bugs |=  FF_BUG_NO_PADDING;
284
        else
285
            s->workaround_bugs &= ~FF_BUG_NO_PADDING;
286
    }
287

    
288
    // handle formats which don't have unique end markers
289
    if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
290
        int left= s->gb.size_in_bits - get_bits_count(&s->gb);
291
        int max_extra=7;
292

    
293
        /* no markers in M$ crap */
294
        if(s->msmpeg4_version && s->pict_type==I_TYPE)
295
            max_extra+= 17;
296

    
297
        /* buggy padding but the frame should still end approximately at the bitstream end */
298
        if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_resilience>=3)
299
            max_extra+= 48;
300
        else if((s->workaround_bugs&FF_BUG_NO_PADDING))
301
            max_extra+= 256*256*256*64;
302

    
303
        if(left>max_extra){
304
            av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
305
        }
306
        else if(left<0){
307
            av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
308
        }else
309
            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);
310

    
311
        return 0;
312
    }
313

    
314
    av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
315
            s->gb.size_in_bits - get_bits_count(&s->gb),
316
            show_bits(&s->gb, 24), s->padding_bug_score);
317

    
318
    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);
319

    
320
    return -1;
321
}
322

    
323
int ff_h263_decode_frame(AVCodecContext *avctx,
324
                             void *data, int *data_size,
325
                             uint8_t *buf, int buf_size)
326
{
327
    MpegEncContext *s = avctx->priv_data;
328
    int ret;
329
    AVFrame *pict = data;
330

    
331
#ifdef PRINT_FRAME_TIME
332
uint64_t time= rdtsc();
333
#endif
334
#ifdef DEBUG
335
    av_log(avctx, AV_LOG_DEBUG, "*****frame %d size=%d\n", avctx->frame_number, buf_size);
336
    if(buf_size>0)
337
        av_log(avctx, AV_LOG_DEBUG, "bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
338
#endif
339
    s->flags= avctx->flags;
340
    s->flags2= avctx->flags2;
341

    
342
    /* no supplementary picture */
343
    if (buf_size == 0) {
344
        /* special case for last picture */
345
        if (s->low_delay==0 && s->next_picture_ptr) {
346
            *pict= *(AVFrame*)s->next_picture_ptr;
347
            s->next_picture_ptr= NULL;
348

    
349
            *data_size = sizeof(AVFrame);
350
        }
351

    
352
        return 0;
353
    }
354

    
355
    if(s->flags&CODEC_FLAG_TRUNCATED){
356
        int next;
357

    
358
        if(s->codec_id==CODEC_ID_MPEG4){
359
            next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
360
        }else if(s->codec_id==CODEC_ID_H263){
361
            next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
362
        }else{
363
            av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
364
            return -1;
365
        }
366

    
367
        if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
368
            return buf_size;
369
    }
370

    
371

    
372
retry:
373

    
374
    if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
375
        init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
376
    }else
377
        init_get_bits(&s->gb, buf, buf_size*8);
378
    s->bitstream_buffer_size=0;
379

    
380
    if (!s->context_initialized) {
381
        if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
382
            return -1;
383
    }
384

    
385
    //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
386
    if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
387
        int i= ff_find_unused_picture(s, 0);
388
        s->current_picture_ptr= &s->picture[i];
389
    }
390

    
391
    /* let's go :-) */
392
    if (ENABLE_WMV2_DECODER && s->msmpeg4_version==5) {
393
        ret= ff_wmv2_decode_picture_header(s);
394
    } else if (ENABLE_MSMPEG4_DECODER && s->msmpeg4_version) {
395
        ret = msmpeg4_decode_picture_header(s);
396
    } else if (s->h263_pred) {
397
        if(s->avctx->extradata_size && s->picture_number==0){
398
            GetBitContext gb;
399

    
400
            init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
401
            ret = ff_mpeg4_decode_picture_header(s, &gb);
402
        }
403
        ret = ff_mpeg4_decode_picture_header(s, &s->gb);
404

    
405
        if(s->flags& CODEC_FLAG_LOW_DELAY)
406
            s->low_delay=1;
407
    } else if (s->codec_id == CODEC_ID_H263I) {
408
        ret = intel_h263_decode_picture_header(s);
409
    } else if (s->h263_flv) {
410
        ret = flv_h263_decode_picture_header(s);
411
    } else {
412
        ret = h263_decode_picture_header(s);
413
    }
414

    
415
    if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
416

    
417
    /* skip if the header was thrashed */
418
    if (ret < 0){
419
        av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
420
        return -1;
421
    }
422

    
423
    avctx->has_b_frames= !s->low_delay;
424

    
425
    if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
426
        if(s->stream_codec_tag == ff_get_fourcc("XVID") ||
427
           s->codec_tag == ff_get_fourcc("XVID") || s->codec_tag == ff_get_fourcc("XVIX") ||
428
           s->codec_tag == ff_get_fourcc("RMP4"))
429
            s->xvid_build= -1;
430
#if 0
431
        if(s->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
432
           && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
433
            s->xvid_build= -1;
434
#endif
435
    }
436

    
437
    if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
438
        if(s->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
439
            s->divx_version= 400; //divx 4
440
    }
441

    
442
    if(s->xvid_build && s->divx_version){
443
        s->divx_version=
444
        s->divx_build= 0;
445
    }
446

    
447
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
448
        if(s->codec_tag == ff_get_fourcc("XVIX"))
449
            s->workaround_bugs|= FF_BUG_XVID_ILACE;
450

    
451
        if(s->codec_tag == ff_get_fourcc("UMP4")){
452
            s->workaround_bugs|= FF_BUG_UMP4;
453
        }
454

    
455
        if(s->divx_version>=500){
456
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
457
        }
458

    
459
        if(s->divx_version>502){
460
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
461
        }
462

    
463
        if(s->xvid_build && s->xvid_build<=3)
464
            s->padding_bug_score= 256*256*256*64;
465

    
466
        if(s->xvid_build && s->xvid_build<=1)
467
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
468

    
469
        if(s->xvid_build && s->xvid_build<=12)
470
            s->workaround_bugs|= FF_BUG_EDGE;
471

    
472
        if(s->xvid_build && s->xvid_build<=32)
473
            s->workaround_bugs|= FF_BUG_DC_CLIP;
474

    
475
#define SET_QPEL_FUNC(postfix1, postfix2) \
476
    s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
477
    s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
478
    s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
479

    
480
        if(s->lavc_build && s->lavc_build<4653)
481
            s->workaround_bugs|= FF_BUG_STD_QPEL;
482

    
483
        if(s->lavc_build && s->lavc_build<4655)
484
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
485

    
486
        if(s->lavc_build && s->lavc_build<4670){
487
            s->workaround_bugs|= FF_BUG_EDGE;
488
        }
489

    
490
        if(s->lavc_build && s->lavc_build<=4712)
491
            s->workaround_bugs|= FF_BUG_DC_CLIP;
492

    
493
        if(s->divx_version)
494
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
495
//printf("padding_bug_score: %d\n", s->padding_bug_score);
496
        if(s->divx_version==501 && s->divx_build==20020416)
497
            s->padding_bug_score= 256*256*256*64;
498

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

    
503
        if(s->divx_version)
504
            s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
505
#if 0
506
        if(s->divx_version==500)
507
            s->padding_bug_score= 256*256*256*64;
508

509
        /* very ugly XVID padding bug detection FIXME/XXX solve this differently
510
         * lets hope this at least works
511
         */
512
        if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
513
           && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
514
            s->workaround_bugs|= FF_BUG_NO_PADDING;
515

516
        if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
517
            s->workaround_bugs|= FF_BUG_NO_PADDING;
518
#endif
519
    }
520

    
521
    if(s->workaround_bugs& FF_BUG_STD_QPEL){
522
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
523
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
524
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
525
        SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
526
        SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
527
        SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
528

    
529
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
530
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
531
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
532
        SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
533
        SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
534
        SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
535
    }
536

    
537
    if(avctx->debug & FF_DEBUG_BUGS)
538
        av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
539
               s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
540
               s->divx_packed ? "p" : "");
541

    
542
#if 0 // dump bits per frame / qp / complexity
543
{
544
    static FILE *f=NULL;
545
    if(!f) f=fopen("rate_qp_cplx.txt", "w");
546
    fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
547
}
548
#endif
549

    
550
#if defined(HAVE_MMX) && defined(CONFIG_GPL)
551
    if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & MM_MMX)){
552
        avctx->idct_algo= FF_IDCT_XVIDMMX;
553
        avctx->coded_width= 0; // force reinit
554
//        dsputil_init(&s->dsp, avctx);
555
        s->picture_number=0;
556
    }
557
#endif
558

    
559
        /* After H263 & mpeg4 header decode we have the height, width,*/
560
        /* and other parameters. So then we could init the picture   */
561
        /* FIXME: By the way H263 decoder is evolving it should have */
562
        /* an H263EncContext                                         */
563

    
564
    if (   s->width  != avctx->coded_width
565
        || s->height != avctx->coded_height) {
566
        /* H.263 could change picture size any time */
567
        ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
568
        s->parse_context.buffer=0;
569
        MPV_common_end(s);
570
        s->parse_context= pc;
571
    }
572
    if (!s->context_initialized) {
573
        avcodec_set_dimensions(avctx, s->width, s->height);
574

    
575
        goto retry;
576
    }
577

    
578
    if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
579
        s->gob_index = ff_h263_get_gob_height(s);
580

    
581
    // for hurry_up==5
582
    s->current_picture.pict_type= s->pict_type;
583
    s->current_picture.key_frame= s->pict_type == I_TYPE;
584

    
585
    /* skip B-frames if we don't have reference frames */
586
    if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
587
    /* skip b frames if we are in a hurry */
588
    if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
589
    if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)
590
       || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)
591
       ||  avctx->skip_frame >= AVDISCARD_ALL)
592
        return get_consumed_bytes(s, buf_size);
593
    /* skip everything if we are in a hurry>=5 */
594
    if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
595

    
596
    if(s->next_p_frame_damaged){
597
        if(s->pict_type==B_TYPE)
598
            return get_consumed_bytes(s, buf_size);
599
        else
600
            s->next_p_frame_damaged=0;
601
    }
602

    
603
    if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==B_TYPE){
604
        s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
605
        s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
606
    }else if((!s->no_rounding) || s->pict_type==B_TYPE){
607
        s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
608
        s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
609
    }else{
610
        s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
611
        s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
612
    }
613

    
614
    if(MPV_frame_start(s, avctx) < 0)
615
        return -1;
616

    
617
#ifdef DEBUG
618
    av_log(avctx, AV_LOG_DEBUG, "qscale=%d\n", s->qscale);
619
#endif
620

    
621
    ff_er_frame_start(s);
622

    
623
    //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
624
    //which isnt available before MPV_frame_start()
625
    if (s->msmpeg4_version==5){
626
        if(!ENABLE_WMV2_DECODER || ff_wmv2_decode_secondary_picture_header(s) < 0)
627
            return -1;
628
    }
629

    
630
    /* decode each macroblock */
631
    s->mb_x=0;
632
    s->mb_y=0;
633

    
634
    decode_slice(s);
635
    while(s->mb_y<s->mb_height){
636
        if(s->msmpeg4_version){
637
            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)
638
                break;
639
        }else{
640
            if(ff_h263_resync(s)<0)
641
                break;
642
        }
643

    
644
        if(s->msmpeg4_version<4 && s->h263_pred)
645
            ff_mpeg4_clean_buffers(s);
646

    
647
        decode_slice(s);
648
    }
649

    
650
    if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
651
        if(!ENABLE_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){
652
            s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
653
        }
654

    
655
    /* divx 5.01+ bistream reorder stuff */
656
    if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
657
        int current_pos= get_bits_count(&s->gb)>>3;
658
        int startcode_found=0;
659

    
660
        if(buf_size - current_pos > 5){
661
            int i;
662
            for(i=current_pos; i<buf_size-3; i++){
663
                if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
664
                    startcode_found=1;
665
                    break;
666
                }
667
            }
668
        }
669
        if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
670
            startcode_found=1;
671
            current_pos=0;
672
        }
673

    
674
        if(startcode_found){
675
            s->bitstream_buffer= av_fast_realloc(
676
                s->bitstream_buffer,
677
                &s->allocated_bitstream_buffer_size,
678
                buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
679
            memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
680
            s->bitstream_buffer_size= buf_size - current_pos;
681
        }
682
    }
683

    
684
    ff_er_frame_end(s);
685

    
686
    MPV_frame_end(s);
687

    
688
assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
689
assert(s->current_picture.pict_type == s->pict_type);
690
    if (s->pict_type == B_TYPE || s->low_delay) {
691
        *pict= *(AVFrame*)s->current_picture_ptr;
692
    } else if (s->last_picture_ptr != NULL) {
693
        *pict= *(AVFrame*)s->last_picture_ptr;
694
    }
695

    
696
    if(s->last_picture_ptr || s->low_delay){
697
        *data_size = sizeof(AVFrame);
698
        ff_print_debug_info(s, pict);
699
    }
700

    
701
    /* Return the Picture timestamp as the frame number */
702
    /* we substract 1 because it is added on utils.c    */
703
    avctx->frame_number = s->picture_number - 1;
704

    
705
#ifdef PRINT_FRAME_TIME
706
av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
707
#endif
708

    
709
    return get_consumed_bytes(s, buf_size);
710
}
711

    
712
AVCodec mpeg4_decoder = {
713
    "mpeg4",
714
    CODEC_TYPE_VIDEO,
715
    CODEC_ID_MPEG4,
716
    sizeof(MpegEncContext),
717
    ff_h263_decode_init,
718
    NULL,
719
    ff_h263_decode_end,
720
    ff_h263_decode_frame,
721
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
722
    .flush= ff_mpeg_flush,
723
};
724

    
725
AVCodec h263_decoder = {
726
    "h263",
727
    CODEC_TYPE_VIDEO,
728
    CODEC_ID_H263,
729
    sizeof(MpegEncContext),
730
    ff_h263_decode_init,
731
    NULL,
732
    ff_h263_decode_end,
733
    ff_h263_decode_frame,
734
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
735
    .flush= ff_mpeg_flush,
736
};
737

    
738
AVCodec msmpeg4v1_decoder = {
739
    "msmpeg4v1",
740
    CODEC_TYPE_VIDEO,
741
    CODEC_ID_MSMPEG4V1,
742
    sizeof(MpegEncContext),
743
    ff_h263_decode_init,
744
    NULL,
745
    ff_h263_decode_end,
746
    ff_h263_decode_frame,
747
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
748
};
749

    
750
AVCodec msmpeg4v2_decoder = {
751
    "msmpeg4v2",
752
    CODEC_TYPE_VIDEO,
753
    CODEC_ID_MSMPEG4V2,
754
    sizeof(MpegEncContext),
755
    ff_h263_decode_init,
756
    NULL,
757
    ff_h263_decode_end,
758
    ff_h263_decode_frame,
759
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
760
};
761

    
762
AVCodec msmpeg4v3_decoder = {
763
    "msmpeg4",
764
    CODEC_TYPE_VIDEO,
765
    CODEC_ID_MSMPEG4V3,
766
    sizeof(MpegEncContext),
767
    ff_h263_decode_init,
768
    NULL,
769
    ff_h263_decode_end,
770
    ff_h263_decode_frame,
771
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
772
};
773

    
774
AVCodec wmv1_decoder = {
775
    "wmv1",
776
    CODEC_TYPE_VIDEO,
777
    CODEC_ID_WMV1,
778
    sizeof(MpegEncContext),
779
    ff_h263_decode_init,
780
    NULL,
781
    ff_h263_decode_end,
782
    ff_h263_decode_frame,
783
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
784
};
785

    
786
AVCodec h263i_decoder = {
787
    "h263i",
788
    CODEC_TYPE_VIDEO,
789
    CODEC_ID_H263I,
790
    sizeof(MpegEncContext),
791
    ff_h263_decode_init,
792
    NULL,
793
    ff_h263_decode_end,
794
    ff_h263_decode_frame,
795
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
796
};
797

    
798
AVCodec flv_decoder = {
799
    "flv",
800
    CODEC_TYPE_VIDEO,
801
    CODEC_ID_FLV1,
802
    sizeof(MpegEncContext),
803
    ff_h263_decode_init,
804
    NULL,
805
    ff_h263_decode_end,
806
    ff_h263_decode_frame,
807
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
808
};