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ffmpeg / libavcodec / h263dec.c @ f986c8e2

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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
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 * Lesser General Public License for more details.
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 *
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 * 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
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 */
22

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

    
28
#include "internal.h"
29
#include "avcodec.h"
30
#include "dsputil.h"
31
#include "mpegvideo.h"
32
#include "h263_parser.h"
33
#include "mpeg4video_parser.h"
34
#include "msmpeg4.h"
35

    
36
//#define DEBUG
37
//#define PRINT_FRAME_TIME
38

    
39
av_cold int ff_h263_decode_init(AVCodecContext *avctx)
40
{
41
    MpegEncContext *s = avctx->priv_data;
42

    
43
    s->avctx = avctx;
44
    s->out_format = FMT_H263;
45

    
46
    s->width  = avctx->coded_width;
47
    s->height = avctx->coded_height;
48
    s->workaround_bugs= avctx->workaround_bugs;
49

    
50
    // set defaults
51
    MPV_decode_defaults(s);
52
    s->quant_precision=5;
53
    s->decode_mb= ff_h263_decode_mb;
54
    s->low_delay= 1;
55
    avctx->pix_fmt= avctx->get_format(avctx, avctx->codec->pix_fmts);
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    s->unrestricted_mv= 1;
57

    
58
    /* select sub codec */
59
    switch(avctx->codec->id) {
60
    case CODEC_ID_H263:
61
        s->unrestricted_mv= 0;
62
        break;
63
    case CODEC_ID_MPEG4:
64
        s->decode_mb= ff_mpeg4_decode_mb;
65
        s->time_increment_bits = 4; /* default value for broken headers */
66
        s->h263_pred = 1;
67
        s->low_delay = 0; //default, might be overriden in the vol header during header parsing
68
        break;
69
    case CODEC_ID_MSMPEG4V1:
70
        s->h263_msmpeg4 = 1;
71
        s->h263_pred = 1;
72
        s->msmpeg4_version=1;
73
        break;
74
    case CODEC_ID_MSMPEG4V2:
75
        s->h263_msmpeg4 = 1;
76
        s->h263_pred = 1;
77
        s->msmpeg4_version=2;
78
        break;
79
    case CODEC_ID_MSMPEG4V3:
80
        s->h263_msmpeg4 = 1;
81
        s->h263_pred = 1;
82
        s->msmpeg4_version=3;
83
        break;
84
    case CODEC_ID_WMV1:
85
        s->h263_msmpeg4 = 1;
86
        s->h263_pred = 1;
87
        s->msmpeg4_version=4;
88
        break;
89
    case CODEC_ID_WMV2:
90
        s->h263_msmpeg4 = 1;
91
        s->h263_pred = 1;
92
        s->msmpeg4_version=5;
93
        break;
94
    case CODEC_ID_VC1:
95
    case CODEC_ID_WMV3:
96
        s->h263_msmpeg4 = 1;
97
        s->h263_pred = 1;
98
        s->msmpeg4_version=6;
99
        break;
100
    case CODEC_ID_H263I:
101
        break;
102
    case CODEC_ID_FLV1:
103
        s->h263_flv = 1;
104
        break;
105
    default:
106
        return -1;
107
    }
108
    s->codec_id= avctx->codec->id;
109

    
110
    /* for h263, we allocate the images after having read the header */
111
    if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
112
        if (MPV_common_init(s) < 0)
113
            return -1;
114

    
115
    if (CONFIG_MSMPEG4_DECODER && s->h263_msmpeg4)
116
        ff_msmpeg4_decode_init(s);
117
    else
118
        h263_decode_init_vlc(s);
119

    
120
    return 0;
121
}
122

    
123
av_cold int ff_h263_decode_end(AVCodecContext *avctx)
124
{
125
    MpegEncContext *s = avctx->priv_data;
126

    
127
    MPV_common_end(s);
128
    return 0;
129
}
130

    
131
/**
132
 * returns the number of bytes consumed for building the current frame
133
 */
134
static int get_consumed_bytes(MpegEncContext *s, int buf_size){
135
    int pos= (get_bits_count(&s->gb)+7)>>3;
136

    
137
    if(s->divx_packed || s->avctx->hwaccel){
138
        //we would have to scan through the whole buf to handle the weird reordering ...
139
        return buf_size;
140
    }else if(s->flags&CODEC_FLAG_TRUNCATED){
141
        pos -= s->parse_context.last_index;
142
        if(pos<0) pos=0; // padding is not really read so this might be -1
143
        return pos;
144
    }else{
145
        if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
146
        if(pos+10>buf_size) pos=buf_size; // oops ;)
147

    
148
        return pos;
149
    }
150
}
151

    
152
static int decode_slice(MpegEncContext *s){
153
    const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
154
    const int mb_size= 16>>s->avctx->lowres;
155
    s->last_resync_gb= s->gb;
156
    s->first_slice_line= 1;
157

    
158
    s->resync_mb_x= s->mb_x;
159
    s->resync_mb_y= s->mb_y;
160

    
161
    ff_set_qscale(s, s->qscale);
162

    
163
    if (s->avctx->hwaccel)
164
        return 0;
165

    
166
    if(s->partitioned_frame){
167
        const int qscale= s->qscale;
168

    
169
        if(s->codec_id==CODEC_ID_MPEG4){
170
            if(ff_mpeg4_decode_partitions(s) < 0)
171
                return -1;
172
        }
173

    
174
        /* restore variables which were modified */
175
        s->first_slice_line=1;
176
        s->mb_x= s->resync_mb_x;
177
        s->mb_y= s->resync_mb_y;
178
        ff_set_qscale(s, qscale);
179
    }
180

    
181
    for(; s->mb_y < s->mb_height; s->mb_y++) {
182
        /* per-row end of slice checks */
183
        if(s->msmpeg4_version){
184
            if(s->resync_mb_y + s->slice_height == s->mb_y){
185
                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);
186

    
187
                return 0;
188
            }
189
        }
190

    
191
        if(s->msmpeg4_version==1){
192
            s->last_dc[0]=
193
            s->last_dc[1]=
194
            s->last_dc[2]= 128;
195
        }
196

    
197
        ff_init_block_index(s);
198
        for(; s->mb_x < s->mb_width; s->mb_x++) {
199
            int ret;
200

    
201
            ff_update_block_index(s);
202

    
203
            if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
204
                s->first_slice_line=0;
205
            }
206

    
207
            /* DCT & quantize */
208

    
209
            s->mv_dir = MV_DIR_FORWARD;
210
            s->mv_type = MV_TYPE_16X16;
211
//            s->mb_skipped = 0;
212
//printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
213
            ret= s->decode_mb(s, s->block);
214

    
215
            if (s->pict_type!=FF_B_TYPE)
216
                ff_h263_update_motion_val(s);
217

    
218
            if(ret<0){
219
                const int xy= s->mb_x + s->mb_y*s->mb_stride;
220
                if(ret==SLICE_END){
221
                    MPV_decode_mb(s, s->block);
222
                    if(s->loop_filter)
223
                        ff_h263_loop_filter(s);
224

    
225
//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));
226
                    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);
227

    
228
                    s->padding_bug_score--;
229

    
230
                    if(++s->mb_x >= s->mb_width){
231
                        s->mb_x=0;
232
                        ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
233
                        s->mb_y++;
234
                    }
235
                    return 0;
236
                }else if(ret==SLICE_NOEND){
237
                    av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
238
                    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);
239
                    return -1;
240
                }
241
                av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
242
                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);
243

    
244
                return -1;
245
            }
246

    
247
            MPV_decode_mb(s, s->block);
248
            if(s->loop_filter)
249
                ff_h263_loop_filter(s);
250
        }
251

    
252
        ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
253

    
254
        s->mb_x= 0;
255
    }
256

    
257
    assert(s->mb_x==0 && s->mb_y==s->mb_height);
258

    
259
    /* try to detect the padding bug */
260
    if(      s->codec_id==CODEC_ID_MPEG4
261
       &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
262
       &&    s->gb.size_in_bits - get_bits_count(&s->gb) >=0
263
       &&    s->gb.size_in_bits - get_bits_count(&s->gb) < 48
264
//       &&   !s->resync_marker
265
       &&   !s->data_partitioning){
266

    
267
        const int bits_count= get_bits_count(&s->gb);
268
        const int bits_left = s->gb.size_in_bits - bits_count;
269

    
270
        if(bits_left==0){
271
            s->padding_bug_score+=16;
272
        } else if(bits_left != 1){
273
            int v= show_bits(&s->gb, 8);
274
            v|= 0x7F >> (7-(bits_count&7));
275

    
276
            if(v==0x7F && bits_left<=8)
277
                s->padding_bug_score--;
278
            else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
279
                s->padding_bug_score+= 4;
280
            else
281
                s->padding_bug_score++;
282
        }
283
    }
284

    
285
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
286
        if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version || !s->resync_marker)*/)
287
            s->workaround_bugs |=  FF_BUG_NO_PADDING;
288
        else
289
            s->workaround_bugs &= ~FF_BUG_NO_PADDING;
290
    }
291

    
292
    // handle formats which don't have unique end markers
293
    if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
294
        int left= s->gb.size_in_bits - get_bits_count(&s->gb);
295
        int max_extra=7;
296

    
297
        /* no markers in M$ crap */
298
        if(s->msmpeg4_version && s->pict_type==FF_I_TYPE)
299
            max_extra+= 17;
300

    
301
        /* buggy padding but the frame should still end approximately at the bitstream end */
302
        if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_recognition>=3)
303
            max_extra+= 48;
304
        else if((s->workaround_bugs&FF_BUG_NO_PADDING))
305
            max_extra+= 256*256*256*64;
306

    
307
        if(left>max_extra){
308
            av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
309
        }
310
        else if(left<0){
311
            av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
312
        }else
313
            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);
314

    
315
        return 0;
316
    }
317

    
318
    av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
319
            s->gb.size_in_bits - get_bits_count(&s->gb),
320
            show_bits(&s->gb, 24), s->padding_bug_score);
321

    
322
    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);
323

    
324
    return -1;
325
}
326

    
327
int ff_h263_decode_frame(AVCodecContext *avctx,
328
                             void *data, int *data_size,
329
                             const uint8_t *buf, int buf_size)
330
{
331
    MpegEncContext *s = avctx->priv_data;
332
    int ret;
333
    AVFrame *pict = data;
334

    
335
#ifdef PRINT_FRAME_TIME
336
uint64_t time= rdtsc();
337
#endif
338
#ifdef DEBUG
339
    av_log(avctx, AV_LOG_DEBUG, "*****frame %d size=%d\n", avctx->frame_number, buf_size);
340
    if(buf_size>0)
341
        av_log(avctx, AV_LOG_DEBUG, "bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
342
#endif
343
    s->flags= avctx->flags;
344
    s->flags2= avctx->flags2;
345

    
346
    /* no supplementary picture */
347
    if (buf_size == 0) {
348
        /* special case for last picture */
349
        if (s->low_delay==0 && s->next_picture_ptr) {
350
            *pict= *(AVFrame*)s->next_picture_ptr;
351
            s->next_picture_ptr= NULL;
352

    
353
            *data_size = sizeof(AVFrame);
354
        }
355

    
356
        return 0;
357
    }
358

    
359
    if(s->flags&CODEC_FLAG_TRUNCATED){
360
        int next;
361

    
362
        if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
363
            next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
364
        }else if(CONFIG_H263_DECODER && s->codec_id==CODEC_ID_H263){
365
            next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
366
        }else{
367
            av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
368
            return -1;
369
        }
370

    
371
        if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
372
            return buf_size;
373
    }
374

    
375

    
376
retry:
377

    
378
    if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
379
        init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
380
    }else
381
        init_get_bits(&s->gb, buf, buf_size*8);
382
    s->bitstream_buffer_size=0;
383

    
384
    if (!s->context_initialized) {
385
        if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
386
            return -1;
387
    }
388

    
389
    /* We need to set current_picture_ptr before reading the header,
390
     * otherwise we cannot store anyting in there */
391
    if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
392
        int i= ff_find_unused_picture(s, 0);
393
        s->current_picture_ptr= &s->picture[i];
394
    }
395

    
396
    /* let's go :-) */
397
    if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
398
        ret= ff_wmv2_decode_picture_header(s);
399
    } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
400
        ret = msmpeg4_decode_picture_header(s);
401
    } else if (s->h263_pred) {
402
        if(s->avctx->extradata_size && s->picture_number==0){
403
            GetBitContext gb;
404

    
405
            init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
406
            ret = ff_mpeg4_decode_picture_header(s, &gb);
407
        }
408
        ret = ff_mpeg4_decode_picture_header(s, &s->gb);
409
    } else if (s->codec_id == CODEC_ID_H263I) {
410
        ret = intel_h263_decode_picture_header(s);
411
    } else if (s->h263_flv) {
412
        ret = flv_h263_decode_picture_header(s);
413
    } else {
414
        ret = h263_decode_picture_header(s);
415
    }
416

    
417
    if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
418

    
419
    /* skip if the header was thrashed */
420
    if (ret < 0){
421
        av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
422
        return -1;
423
    }
424

    
425
    avctx->has_b_frames= !s->low_delay;
426

    
427
    if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
428
        if(s->stream_codec_tag == AV_RL32("XVID") ||
429
           s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
430
           s->codec_tag == AV_RL32("RMP4"))
431
            s->xvid_build= -1;
432
#if 0
433
        if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
434
           && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
435
            s->xvid_build= -1;
436
#endif
437
    }
438

    
439
    if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
440
        if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
441
            s->divx_version= 400; //divx 4
442
    }
443

    
444
    if(s->xvid_build && s->divx_version){
445
        s->divx_version=
446
        s->divx_build= 0;
447
    }
448

    
449
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
450
        if(s->codec_tag == AV_RL32("XVIX"))
451
            s->workaround_bugs|= FF_BUG_XVID_ILACE;
452

    
453
        if(s->codec_tag == AV_RL32("UMP4")){
454
            s->workaround_bugs|= FF_BUG_UMP4;
455
        }
456

    
457
        if(s->divx_version>=500 && s->divx_build<1814){
458
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
459
        }
460

    
461
        if(s->divx_version>502 && s->divx_build<1814){
462
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
463
        }
464

    
465
        if(s->xvid_build && s->xvid_build<=3)
466
            s->padding_bug_score= 256*256*256*64;
467

    
468
        if(s->xvid_build && s->xvid_build<=1)
469
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
470

    
471
        if(s->xvid_build && s->xvid_build<=12)
472
            s->workaround_bugs|= FF_BUG_EDGE;
473

    
474
        if(s->xvid_build && s->xvid_build<=32)
475
            s->workaround_bugs|= FF_BUG_DC_CLIP;
476

    
477
#define SET_QPEL_FUNC(postfix1, postfix2) \
478
    s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
479
    s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
480
    s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
481

    
482
        if(s->lavc_build && s->lavc_build<4653)
483
            s->workaround_bugs|= FF_BUG_STD_QPEL;
484

    
485
        if(s->lavc_build && s->lavc_build<4655)
486
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
487

    
488
        if(s->lavc_build && s->lavc_build<4670){
489
            s->workaround_bugs|= FF_BUG_EDGE;
490
        }
491

    
492
        if(s->lavc_build && s->lavc_build<=4712)
493
            s->workaround_bugs|= FF_BUG_DC_CLIP;
494

    
495
        if(s->divx_version)
496
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
497
//printf("padding_bug_score: %d\n", s->padding_bug_score);
498
        if(s->divx_version==501 && s->divx_build==20020416)
499
            s->padding_bug_score= 256*256*256*64;
500

    
501
        if(s->divx_version && s->divx_version<500){
502
            s->workaround_bugs|= FF_BUG_EDGE;
503
        }
504

    
505
        if(s->divx_version)
506
            s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
507
#if 0
508
        if(s->divx_version==500)
509
            s->padding_bug_score= 256*256*256*64;
510

511
        /* very ugly XVID padding bug detection FIXME/XXX solve this differently
512
         * Let us hope this at least works.
513
         */
514
        if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
515
           && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
516
            s->workaround_bugs|= FF_BUG_NO_PADDING;
517

518
        if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
519
            s->workaround_bugs|= FF_BUG_NO_PADDING;
520
#endif
521
    }
522

    
523
    if(s->workaround_bugs& FF_BUG_STD_QPEL){
524
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
525
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
526
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
527
        SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
528
        SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
529
        SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
530

    
531
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
532
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
533
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
534
        SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
535
        SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
536
        SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
537
    }
538

    
539
    if(avctx->debug & FF_DEBUG_BUGS)
540
        av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
541
               s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
542
               s->divx_packed ? "p" : "");
543

    
544
#if 0 // dump bits per frame / qp / complexity
545
{
546
    static FILE *f=NULL;
547
    if(!f) f=fopen("rate_qp_cplx.txt", "w");
548
    fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
549
}
550
#endif
551

    
552
#if HAVE_MMX
553
    if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & FF_MM_MMX)){
554
        avctx->idct_algo= FF_IDCT_XVIDMMX;
555
        avctx->coded_width= 0; // force reinit
556
//        dsputil_init(&s->dsp, avctx);
557
        s->picture_number=0;
558
    }
559
#endif
560

    
561
        /* After H263 & mpeg4 header decode we have the height, width,*/
562
        /* and other parameters. So then we could init the picture   */
563
        /* FIXME: By the way H263 decoder is evolving it should have */
564
        /* an H263EncContext                                         */
565

    
566
    if (   s->width  != avctx->coded_width
567
        || s->height != avctx->coded_height) {
568
        /* H.263 could change picture size any time */
569
        ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
570
        s->parse_context.buffer=0;
571
        MPV_common_end(s);
572
        s->parse_context= pc;
573
    }
574
    if (!s->context_initialized) {
575
        avcodec_set_dimensions(avctx, s->width, s->height);
576

    
577
        goto retry;
578
    }
579

    
580
    if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P || s->codec_id == CODEC_ID_H263I))
581
        s->gob_index = ff_h263_get_gob_height(s);
582

    
583
    // for hurry_up==5
584
    s->current_picture.pict_type= s->pict_type;
585
    s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
586

    
587
    /* skip B-frames if we don't have reference frames */
588
    if(s->last_picture_ptr==NULL && (s->pict_type==FF_B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
589
    /* skip b frames if we are in a hurry */
590
    if(avctx->hurry_up && s->pict_type==FF_B_TYPE) return get_consumed_bytes(s, buf_size);
591
    if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==FF_B_TYPE)
592
       || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=FF_I_TYPE)
593
       ||  avctx->skip_frame >= AVDISCARD_ALL)
594
        return get_consumed_bytes(s, buf_size);
595
    /* skip everything if we are in a hurry>=5 */
596
    if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
597

    
598
    if(s->next_p_frame_damaged){
599
        if(s->pict_type==FF_B_TYPE)
600
            return get_consumed_bytes(s, buf_size);
601
        else
602
            s->next_p_frame_damaged=0;
603
    }
604

    
605
    if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==FF_B_TYPE){
606
        s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
607
        s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
608
    }else if((!s->no_rounding) || s->pict_type==FF_B_TYPE){
609
        s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
610
        s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
611
    }else{
612
        s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
613
        s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
614
    }
615

    
616
    if(MPV_frame_start(s, avctx) < 0)
617
        return -1;
618

    
619
#ifdef DEBUG
620
    av_log(avctx, AV_LOG_DEBUG, "qscale=%d\n", s->qscale);
621
#endif
622

    
623
    ff_er_frame_start(s);
624

    
625
    //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
626
    //which is not available before MPV_frame_start()
627
    if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
628
        ret = ff_wmv2_decode_secondary_picture_header(s);
629
        if(ret<0) return ret;
630
        if(ret==1) goto intrax8_decoded;
631
    }
632

    
633
    /* decode each macroblock */
634
    s->mb_x=0;
635
    s->mb_y=0;
636

    
637
    decode_slice(s);
638
    while(s->mb_y<s->mb_height){
639
        if(s->msmpeg4_version){
640
            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)
641
                break;
642
        }else{
643
            if(ff_h263_resync(s)<0)
644
                break;
645
        }
646

    
647
        if(s->msmpeg4_version<4 && s->h263_pred)
648
            ff_mpeg4_clean_buffers(s);
649

    
650
        decode_slice(s);
651
    }
652

    
653
    if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==FF_I_TYPE)
654
        if(!CONFIG_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){
655
            s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
656
        }
657

    
658
    /* divx 5.01+ bistream reorder stuff */
659
    if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
660
        int current_pos= get_bits_count(&s->gb)>>3;
661
        int startcode_found=0;
662

    
663
        if(buf_size - current_pos > 5){
664
            int i;
665
            for(i=current_pos; i<buf_size-3; i++){
666
                if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
667
                    startcode_found=1;
668
                    break;
669
                }
670
            }
671
        }
672
        if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
673
            startcode_found=1;
674
            current_pos=0;
675
        }
676

    
677
        if(startcode_found){
678
            s->bitstream_buffer= av_fast_realloc(
679
                s->bitstream_buffer,
680
                &s->allocated_bitstream_buffer_size,
681
                buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
682
            memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
683
            s->bitstream_buffer_size= buf_size - current_pos;
684
        }
685
    }
686

    
687
intrax8_decoded:
688
    ff_er_frame_end(s);
689

    
690
    if (avctx->hwaccel) {
691
        if (avctx->hwaccel->end_frame(avctx) < 0)
692
            return -1;
693
    }
694

    
695
    MPV_frame_end(s);
696

    
697
assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
698
assert(s->current_picture.pict_type == s->pict_type);
699
    if (s->pict_type == FF_B_TYPE || s->low_delay) {
700
        *pict= *(AVFrame*)s->current_picture_ptr;
701
    } else if (s->last_picture_ptr != NULL) {
702
        *pict= *(AVFrame*)s->last_picture_ptr;
703
    }
704

    
705
    if(s->last_picture_ptr || s->low_delay){
706
        *data_size = sizeof(AVFrame);
707
        ff_print_debug_info(s, pict);
708
    }
709

    
710
    /* Return the Picture timestamp as the frame number */
711
    /* we subtract 1 because it is added on utils.c     */
712
    avctx->frame_number = s->picture_number - 1;
713

    
714
#ifdef PRINT_FRAME_TIME
715
av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
716
#endif
717

    
718
    return get_consumed_bytes(s, buf_size);
719
}
720

    
721
AVCodec mpeg4_decoder = {
722
    "mpeg4",
723
    CODEC_TYPE_VIDEO,
724
    CODEC_ID_MPEG4,
725
    sizeof(MpegEncContext),
726
    ff_h263_decode_init,
727
    NULL,
728
    ff_h263_decode_end,
729
    ff_h263_decode_frame,
730
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
731
    .flush= ff_mpeg_flush,
732
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
733
    .pix_fmts= ff_pixfmt_list_420,
734
};
735

    
736
AVCodec h263_decoder = {
737
    "h263",
738
    CODEC_TYPE_VIDEO,
739
    CODEC_ID_H263,
740
    sizeof(MpegEncContext),
741
    ff_h263_decode_init,
742
    NULL,
743
    ff_h263_decode_end,
744
    ff_h263_decode_frame,
745
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
746
    .flush= ff_mpeg_flush,
747
    .long_name= NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998"),
748
    .pix_fmts= ff_pixfmt_list_420,
749
};
750

    
751
AVCodec msmpeg4v1_decoder = {
752
    "msmpeg4v1",
753
    CODEC_TYPE_VIDEO,
754
    CODEC_ID_MSMPEG4V1,
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
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"),
762
    .pix_fmts= ff_pixfmt_list_420,
763
};
764

    
765
AVCodec msmpeg4v2_decoder = {
766
    "msmpeg4v2",
767
    CODEC_TYPE_VIDEO,
768
    CODEC_ID_MSMPEG4V2,
769
    sizeof(MpegEncContext),
770
    ff_h263_decode_init,
771
    NULL,
772
    ff_h263_decode_end,
773
    ff_h263_decode_frame,
774
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
775
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"),
776
    .pix_fmts= ff_pixfmt_list_420,
777
};
778

    
779
AVCodec msmpeg4v3_decoder = {
780
    "msmpeg4",
781
    CODEC_TYPE_VIDEO,
782
    CODEC_ID_MSMPEG4V3,
783
    sizeof(MpegEncContext),
784
    ff_h263_decode_init,
785
    NULL,
786
    ff_h263_decode_end,
787
    ff_h263_decode_frame,
788
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
789
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"),
790
    .pix_fmts= ff_pixfmt_list_420,
791
};
792

    
793
AVCodec wmv1_decoder = {
794
    "wmv1",
795
    CODEC_TYPE_VIDEO,
796
    CODEC_ID_WMV1,
797
    sizeof(MpegEncContext),
798
    ff_h263_decode_init,
799
    NULL,
800
    ff_h263_decode_end,
801
    ff_h263_decode_frame,
802
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
803
    .long_name= NULL_IF_CONFIG_SMALL("Windows Media Video 7"),
804
    .pix_fmts= ff_pixfmt_list_420,
805
};
806

    
807
AVCodec h263i_decoder = {
808
    "h263i",
809
    CODEC_TYPE_VIDEO,
810
    CODEC_ID_H263I,
811
    sizeof(MpegEncContext),
812
    ff_h263_decode_init,
813
    NULL,
814
    ff_h263_decode_end,
815
    ff_h263_decode_frame,
816
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
817
    .long_name = NULL_IF_CONFIG_SMALL("Intel H.263"),
818
    .pix_fmts= ff_pixfmt_list_420,
819
};
820

    
821
AVCodec flv_decoder = {
822
    "flv",
823
    CODEC_TYPE_VIDEO,
824
    CODEC_ID_FLV1,
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,
831
    .long_name= NULL_IF_CONFIG_SMALL("Flash Video"),
832
    .pix_fmts= ff_pixfmt_list_420,
833
};