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ffmpeg / libavcodec / h263dec.c @ 755bfeab

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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
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 * License along with FFmpeg; if not, write to the Free Software
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 * 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);
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    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 that is 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,
386
     * otherwise we cannot store anyting in there */
387
    if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
388
        int i= ff_find_unused_picture(s, 0);
389
        s->current_picture_ptr= &s->picture[i];
390
    }
391

    
392
    /* let's go :-) */
393
    if (ENABLE_WMV2_DECODER && s->msmpeg4_version==5) {
394
        ret= ff_wmv2_decode_picture_header(s);
395
    } else if (ENABLE_MSMPEG4_DECODER && s->msmpeg4_version) {
396
        ret = msmpeg4_decode_picture_header(s);
397
    } else if (s->h263_pred) {
398
        if(s->avctx->extradata_size && s->picture_number==0){
399
            GetBitContext gb;
400

    
401
            init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
402
            ret = ff_mpeg4_decode_picture_header(s, &gb);
403
        }
404
        ret = ff_mpeg4_decode_picture_header(s, &s->gb);
405

    
406
        if(s->flags& CODEC_FLAG_LOW_DELAY)
407
            s->low_delay=1;
408
    } else if (s->codec_id == CODEC_ID_H263I) {
409
        ret = intel_h263_decode_picture_header(s);
410
    } else if (s->h263_flv) {
411
        ret = flv_h263_decode_picture_header(s);
412
    } else {
413
        ret = h263_decode_picture_header(s);
414
    }
415

    
416
    if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
417

    
418
    /* skip if the header was thrashed */
419
    if (ret < 0){
420
        av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
421
        return -1;
422
    }
423

    
424
    avctx->has_b_frames= !s->low_delay;
425

    
426
    if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
427
        if(s->stream_codec_tag == ff_get_fourcc("XVID") ||
428
           s->codec_tag == ff_get_fourcc("XVID") || s->codec_tag == ff_get_fourcc("XVIX") ||
429
           s->codec_tag == ff_get_fourcc("RMP4"))
430
            s->xvid_build= -1;
431
#if 0
432
        if(s->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
433
           && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
434
            s->xvid_build= -1;
435
#endif
436
    }
437

    
438
    if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
439
        if(s->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
440
            s->divx_version= 400; //divx 4
441
    }
442

    
443
    if(s->xvid_build && s->divx_version){
444
        s->divx_version=
445
        s->divx_build= 0;
446
    }
447

    
448
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
449
        if(s->codec_tag == ff_get_fourcc("XVIX"))
450
            s->workaround_bugs|= FF_BUG_XVID_ILACE;
451

    
452
        if(s->codec_tag == ff_get_fourcc("UMP4")){
453
            s->workaround_bugs|= FF_BUG_UMP4;
454
        }
455

    
456
        if(s->divx_version>=500){
457
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
458
        }
459

    
460
        if(s->divx_version>502){
461
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
462
        }
463

    
464
        if(s->xvid_build && s->xvid_build<=3)
465
            s->padding_bug_score= 256*256*256*64;
466

    
467
        if(s->xvid_build && s->xvid_build<=1)
468
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
469

    
470
        if(s->xvid_build && s->xvid_build<=12)
471
            s->workaround_bugs|= FF_BUG_EDGE;
472

    
473
        if(s->xvid_build && s->xvid_build<=32)
474
            s->workaround_bugs|= FF_BUG_DC_CLIP;
475

    
476
#define SET_QPEL_FUNC(postfix1, postfix2) \
477
    s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
478
    s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
479
    s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
480

    
481
        if(s->lavc_build && s->lavc_build<4653)
482
            s->workaround_bugs|= FF_BUG_STD_QPEL;
483

    
484
        if(s->lavc_build && s->lavc_build<4655)
485
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
486

    
487
        if(s->lavc_build && s->lavc_build<4670){
488
            s->workaround_bugs|= FF_BUG_EDGE;
489
        }
490

    
491
        if(s->lavc_build && s->lavc_build<=4712)
492
            s->workaround_bugs|= FF_BUG_DC_CLIP;
493

    
494
        if(s->divx_version)
495
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
496
//printf("padding_bug_score: %d\n", s->padding_bug_score);
497
        if(s->divx_version==501 && s->divx_build==20020416)
498
            s->padding_bug_score= 256*256*256*64;
499

    
500
        if(s->divx_version && s->divx_version<500){
501
            s->workaround_bugs|= FF_BUG_EDGE;
502
        }
503

    
504
        if(s->divx_version)
505
            s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
506
#if 0
507
        if(s->divx_version==500)
508
            s->padding_bug_score= 256*256*256*64;
509

510
        /* very ugly XVID padding bug detection FIXME/XXX solve this differently
511
         * lets hope this at least works
512
         */
513
        if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
514
           && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
515
            s->workaround_bugs|= FF_BUG_NO_PADDING;
516

517
        if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
518
            s->workaround_bugs|= FF_BUG_NO_PADDING;
519
#endif
520
    }
521

    
522
    if(s->workaround_bugs& FF_BUG_STD_QPEL){
523
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
524
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
525
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
526
        SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
527
        SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
528
        SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
529

    
530
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
531
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
532
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
533
        SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
534
        SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
535
        SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
536
    }
537

    
538
    if(avctx->debug & FF_DEBUG_BUGS)
539
        av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
540
               s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
541
               s->divx_packed ? "p" : "");
542

    
543
#if 0 // dump bits per frame / qp / complexity
544
{
545
    static FILE *f=NULL;
546
    if(!f) f=fopen("rate_qp_cplx.txt", "w");
547
    fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
548
}
549
#endif
550

    
551
#if defined(HAVE_MMX) && defined(CONFIG_GPL)
552
    if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & MM_MMX)){
553
        avctx->idct_algo= FF_IDCT_XVIDMMX;
554
        avctx->coded_width= 0; // force reinit
555
//        dsputil_init(&s->dsp, avctx);
556
        s->picture_number=0;
557
    }
558
#endif
559

    
560
        /* After H263 & mpeg4 header decode we have the height, width,*/
561
        /* and other parameters. So then we could init the picture   */
562
        /* FIXME: By the way H263 decoder is evolving it should have */
563
        /* an H263EncContext                                         */
564

    
565
    if (   s->width  != avctx->coded_width
566
        || s->height != avctx->coded_height) {
567
        /* H.263 could change picture size any time */
568
        ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
569
        s->parse_context.buffer=0;
570
        MPV_common_end(s);
571
        s->parse_context= pc;
572
    }
573
    if (!s->context_initialized) {
574
        avcodec_set_dimensions(avctx, s->width, s->height);
575

    
576
        goto retry;
577
    }
578

    
579
    if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
580
        s->gob_index = ff_h263_get_gob_height(s);
581

    
582
    // for hurry_up==5
583
    s->current_picture.pict_type= s->pict_type;
584
    s->current_picture.key_frame= s->pict_type == I_TYPE;
585

    
586
    /* skip B-frames if we don't have reference frames */
587
    if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
588
    /* skip b frames if we are in a hurry */
589
    if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
590
    if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)
591
       || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)
592
       ||  avctx->skip_frame >= AVDISCARD_ALL)
593
        return get_consumed_bytes(s, buf_size);
594
    /* skip everything if we are in a hurry>=5 */
595
    if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
596

    
597
    if(s->next_p_frame_damaged){
598
        if(s->pict_type==B_TYPE)
599
            return get_consumed_bytes(s, buf_size);
600
        else
601
            s->next_p_frame_damaged=0;
602
    }
603

    
604
    if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==B_TYPE){
605
        s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
606
        s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
607
    }else if((!s->no_rounding) || s->pict_type==B_TYPE){
608
        s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
609
        s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
610
    }else{
611
        s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
612
        s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
613
    }
614

    
615
    if(MPV_frame_start(s, avctx) < 0)
616
        return -1;
617

    
618
#ifdef DEBUG
619
    av_log(avctx, AV_LOG_DEBUG, "qscale=%d\n", s->qscale);
620
#endif
621

    
622
    ff_er_frame_start(s);
623

    
624
    //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
625
    //which is not available before MPV_frame_start()
626
    if (s->msmpeg4_version==5){
627
        if(!ENABLE_WMV2_DECODER || ff_wmv2_decode_secondary_picture_header(s) < 0)
628
            return -1;
629
    }
630

    
631
    /* decode each macroblock */
632
    s->mb_x=0;
633
    s->mb_y=0;
634

    
635
    decode_slice(s);
636
    while(s->mb_y<s->mb_height){
637
        if(s->msmpeg4_version){
638
            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)
639
                break;
640
        }else{
641
            if(ff_h263_resync(s)<0)
642
                break;
643
        }
644

    
645
        if(s->msmpeg4_version<4 && s->h263_pred)
646
            ff_mpeg4_clean_buffers(s);
647

    
648
        decode_slice(s);
649
    }
650

    
651
    if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
652
        if(!ENABLE_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){
653
            s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
654
        }
655

    
656
    /* divx 5.01+ bistream reorder stuff */
657
    if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
658
        int current_pos= get_bits_count(&s->gb)>>3;
659
        int startcode_found=0;
660

    
661
        if(buf_size - current_pos > 5){
662
            int i;
663
            for(i=current_pos; i<buf_size-3; i++){
664
                if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
665
                    startcode_found=1;
666
                    break;
667
                }
668
            }
669
        }
670
        if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
671
            startcode_found=1;
672
            current_pos=0;
673
        }
674

    
675
        if(startcode_found){
676
            s->bitstream_buffer= av_fast_realloc(
677
                s->bitstream_buffer,
678
                &s->allocated_bitstream_buffer_size,
679
                buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
680
            memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
681
            s->bitstream_buffer_size= buf_size - current_pos;
682
        }
683
    }
684

    
685
    ff_er_frame_end(s);
686

    
687
    MPV_frame_end(s);
688

    
689
assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
690
assert(s->current_picture.pict_type == s->pict_type);
691
    if (s->pict_type == B_TYPE || s->low_delay) {
692
        *pict= *(AVFrame*)s->current_picture_ptr;
693
    } else if (s->last_picture_ptr != NULL) {
694
        *pict= *(AVFrame*)s->last_picture_ptr;
695
    }
696

    
697
    if(s->last_picture_ptr || s->low_delay){
698
        *data_size = sizeof(AVFrame);
699
        ff_print_debug_info(s, pict);
700
    }
701

    
702
    /* Return the Picture timestamp as the frame number */
703
    /* we substract 1 because it is added on utils.c    */
704
    avctx->frame_number = s->picture_number - 1;
705

    
706
#ifdef PRINT_FRAME_TIME
707
av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
708
#endif
709

    
710
    return get_consumed_bytes(s, buf_size);
711
}
712

    
713
AVCodec mpeg4_decoder = {
714
    "mpeg4",
715
    CODEC_TYPE_VIDEO,
716
    CODEC_ID_MPEG4,
717
    sizeof(MpegEncContext),
718
    ff_h263_decode_init,
719
    NULL,
720
    ff_h263_decode_end,
721
    ff_h263_decode_frame,
722
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
723
    .flush= ff_mpeg_flush,
724
};
725

    
726
AVCodec h263_decoder = {
727
    "h263",
728
    CODEC_TYPE_VIDEO,
729
    CODEC_ID_H263,
730
    sizeof(MpegEncContext),
731
    ff_h263_decode_init,
732
    NULL,
733
    ff_h263_decode_end,
734
    ff_h263_decode_frame,
735
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
736
    .flush= ff_mpeg_flush,
737
};
738

    
739
AVCodec msmpeg4v1_decoder = {
740
    "msmpeg4v1",
741
    CODEC_TYPE_VIDEO,
742
    CODEC_ID_MSMPEG4V1,
743
    sizeof(MpegEncContext),
744
    ff_h263_decode_init,
745
    NULL,
746
    ff_h263_decode_end,
747
    ff_h263_decode_frame,
748
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
749
};
750

    
751
AVCodec msmpeg4v2_decoder = {
752
    "msmpeg4v2",
753
    CODEC_TYPE_VIDEO,
754
    CODEC_ID_MSMPEG4V2,
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,
761
};
762

    
763
AVCodec msmpeg4v3_decoder = {
764
    "msmpeg4",
765
    CODEC_TYPE_VIDEO,
766
    CODEC_ID_MSMPEG4V3,
767
    sizeof(MpegEncContext),
768
    ff_h263_decode_init,
769
    NULL,
770
    ff_h263_decode_end,
771
    ff_h263_decode_frame,
772
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
773
};
774

    
775
AVCodec wmv1_decoder = {
776
    "wmv1",
777
    CODEC_TYPE_VIDEO,
778
    CODEC_ID_WMV1,
779
    sizeof(MpegEncContext),
780
    ff_h263_decode_init,
781
    NULL,
782
    ff_h263_decode_end,
783
    ff_h263_decode_frame,
784
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
785
};
786

    
787
AVCodec h263i_decoder = {
788
    "h263i",
789
    CODEC_TYPE_VIDEO,
790
    CODEC_ID_H263I,
791
    sizeof(MpegEncContext),
792
    ff_h263_decode_init,
793
    NULL,
794
    ff_h263_decode_end,
795
    ff_h263_decode_frame,
796
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
797
};
798

    
799
AVCodec flv_decoder = {
800
    "flv",
801
    CODEC_TYPE_VIDEO,
802
    CODEC_ID_FLV1,
803
    sizeof(MpegEncContext),
804
    ff_h263_decode_init,
805
    NULL,
806
    ff_h263_decode_end,
807
    ff_h263_decode_frame,
808
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
809
};