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ffmpeg / libavcodec / h263dec.c @ 70e0c871

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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
 *
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 * 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
#include "vdpau_internal.h"
36

    
37
//#define DEBUG
38
//#define PRINT_FRAME_TIME
39

    
40
av_cold int ff_h263_decode_init(AVCodecContext *avctx)
41
{
42
    MpegEncContext *s = avctx->priv_data;
43

    
44
    s->avctx = avctx;
45
    s->out_format = FMT_H263;
46

    
47
    s->width  = avctx->coded_width;
48
    s->height = avctx->coded_height;
49
    s->workaround_bugs= avctx->workaround_bugs;
50

    
51
    // set defaults
52
    MPV_decode_defaults(s);
53
    s->quant_precision=5;
54
    s->decode_mb= ff_h263_decode_mb;
55
    s->low_delay= 1;
56
    avctx->pix_fmt= avctx->get_format(avctx, avctx->codec->pix_fmts);
57
    s->unrestricted_mv= 1;
58

    
59
    /* select sub codec */
60
    switch(avctx->codec->id) {
61
    case CODEC_ID_H263:
62
        s->unrestricted_mv= 0;
63
        avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
64
        break;
65
    case CODEC_ID_MPEG4:
66
        s->decode_mb= ff_mpeg4_decode_mb;
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        s->time_increment_bits = 4; /* default value for broken headers */
68
        s->h263_pred = 1;
69
        s->low_delay = 0; //default, might be overriden in the vol header during header parsing
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        avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
71
        break;
72
    case CODEC_ID_MSMPEG4V1:
73
        s->h263_msmpeg4 = 1;
74
        s->h263_pred = 1;
75
        s->msmpeg4_version=1;
76
        break;
77
    case CODEC_ID_MSMPEG4V2:
78
        s->h263_msmpeg4 = 1;
79
        s->h263_pred = 1;
80
        s->msmpeg4_version=2;
81
        break;
82
    case CODEC_ID_MSMPEG4V3:
83
        s->h263_msmpeg4 = 1;
84
        s->h263_pred = 1;
85
        s->msmpeg4_version=3;
86
        break;
87
    case CODEC_ID_WMV1:
88
        s->h263_msmpeg4 = 1;
89
        s->h263_pred = 1;
90
        s->msmpeg4_version=4;
91
        break;
92
    case CODEC_ID_WMV2:
93
        s->h263_msmpeg4 = 1;
94
        s->h263_pred = 1;
95
        s->msmpeg4_version=5;
96
        break;
97
    case CODEC_ID_VC1:
98
    case CODEC_ID_WMV3:
99
        s->h263_msmpeg4 = 1;
100
        s->h263_pred = 1;
101
        s->msmpeg4_version=6;
102
        avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
103
        break;
104
    case CODEC_ID_H263I:
105
        break;
106
    case CODEC_ID_FLV1:
107
        s->h263_flv = 1;
108
        break;
109
    default:
110
        return -1;
111
    }
112
    s->codec_id= avctx->codec->id;
113
    avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
114

    
115
    /* for h263, we allocate the images after having read the header */
116
    if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
117
        if (MPV_common_init(s) < 0)
118
            return -1;
119

    
120
    if (CONFIG_MSMPEG4_DECODER && s->h263_msmpeg4)
121
        ff_msmpeg4_decode_init(s);
122
    else
123
        h263_decode_init_vlc(s);
124

    
125
    return 0;
126
}
127

    
128
av_cold int ff_h263_decode_end(AVCodecContext *avctx)
129
{
130
    MpegEncContext *s = avctx->priv_data;
131

    
132
    MPV_common_end(s);
133
    return 0;
134
}
135

    
136
/**
137
 * returns the number of bytes consumed for building the current frame
138
 */
139
static int get_consumed_bytes(MpegEncContext *s, int buf_size){
140
    int pos= (get_bits_count(&s->gb)+7)>>3;
141

    
142
    if(s->divx_packed || s->avctx->hwaccel){
143
        //we would have to scan through the whole buf to handle the weird reordering ...
144
        return buf_size;
145
    }else if(s->flags&CODEC_FLAG_TRUNCATED){
146
        pos -= s->parse_context.last_index;
147
        if(pos<0) pos=0; // padding is not really read so this might be -1
148
        return pos;
149
    }else{
150
        if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
151
        if(pos+10>buf_size) pos=buf_size; // oops ;)
152

    
153
        return pos;
154
    }
155
}
156

    
157
static int decode_slice(MpegEncContext *s){
158
    const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
159
    const int mb_size= 16>>s->avctx->lowres;
160
    s->last_resync_gb= s->gb;
161
    s->first_slice_line= 1;
162

    
163
    s->resync_mb_x= s->mb_x;
164
    s->resync_mb_y= s->mb_y;
165

    
166
    ff_set_qscale(s, s->qscale);
167

    
168
    if (s->avctx->hwaccel) {
169
        const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
170
        const uint8_t *end  = ff_h263_find_resync_marker(start + 1, s->gb.buffer_end);
171
        skip_bits_long(&s->gb, 8*(end - start));
172
        return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
173
    }
174

    
175
    if(s->partitioned_frame){
176
        const int qscale= s->qscale;
177

    
178
        if(s->codec_id==CODEC_ID_MPEG4){
179
            if(ff_mpeg4_decode_partitions(s) < 0)
180
                return -1;
181
        }
182

    
183
        /* restore variables which were modified */
184
        s->first_slice_line=1;
185
        s->mb_x= s->resync_mb_x;
186
        s->mb_y= s->resync_mb_y;
187
        ff_set_qscale(s, qscale);
188
    }
189

    
190
    for(; s->mb_y < s->mb_height; s->mb_y++) {
191
        /* per-row end of slice checks */
192
        if(s->msmpeg4_version){
193
            if(s->resync_mb_y + s->slice_height == s->mb_y){
194
                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);
195

    
196
                return 0;
197
            }
198
        }
199

    
200
        if(s->msmpeg4_version==1){
201
            s->last_dc[0]=
202
            s->last_dc[1]=
203
            s->last_dc[2]= 128;
204
        }
205

    
206
        ff_init_block_index(s);
207
        for(; s->mb_x < s->mb_width; s->mb_x++) {
208
            int ret;
209

    
210
            ff_update_block_index(s);
211

    
212
            if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
213
                s->first_slice_line=0;
214
            }
215

    
216
            /* DCT & quantize */
217

    
218
            s->mv_dir = MV_DIR_FORWARD;
219
            s->mv_type = MV_TYPE_16X16;
220
//            s->mb_skipped = 0;
221
//printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
222
            ret= s->decode_mb(s, s->block);
223

    
224
            if (s->pict_type!=FF_B_TYPE)
225
                ff_h263_update_motion_val(s);
226

    
227
            if(ret<0){
228
                const int xy= s->mb_x + s->mb_y*s->mb_stride;
229
                if(ret==SLICE_END){
230
                    MPV_decode_mb(s, s->block);
231
                    if(s->loop_filter)
232
                        ff_h263_loop_filter(s);
233

    
234
//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));
235
                    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);
236

    
237
                    s->padding_bug_score--;
238

    
239
                    if(++s->mb_x >= s->mb_width){
240
                        s->mb_x=0;
241
                        ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
242
                        s->mb_y++;
243
                    }
244
                    return 0;
245
                }else if(ret==SLICE_NOEND){
246
                    av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
247
                    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);
248
                    return -1;
249
                }
250
                av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
251
                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);
252

    
253
                return -1;
254
            }
255

    
256
            MPV_decode_mb(s, s->block);
257
            if(s->loop_filter)
258
                ff_h263_loop_filter(s);
259
        }
260

    
261
        ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
262

    
263
        s->mb_x= 0;
264
    }
265

    
266
    assert(s->mb_x==0 && s->mb_y==s->mb_height);
267

    
268
    /* try to detect the padding bug */
269
    if(      s->codec_id==CODEC_ID_MPEG4
270
       &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
271
       &&    s->gb.size_in_bits - get_bits_count(&s->gb) >=0
272
       &&    s->gb.size_in_bits - get_bits_count(&s->gb) < 48
273
//       &&   !s->resync_marker
274
       &&   !s->data_partitioning){
275

    
276
        const int bits_count= get_bits_count(&s->gb);
277
        const int bits_left = s->gb.size_in_bits - bits_count;
278

    
279
        if(bits_left==0){
280
            s->padding_bug_score+=16;
281
        } else if(bits_left != 1){
282
            int v= show_bits(&s->gb, 8);
283
            v|= 0x7F >> (7-(bits_count&7));
284

    
285
            if(v==0x7F && bits_left<=8)
286
                s->padding_bug_score--;
287
            else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
288
                s->padding_bug_score+= 4;
289
            else
290
                s->padding_bug_score++;
291
        }
292
    }
293

    
294
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
295
        if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version || !s->resync_marker)*/)
296
            s->workaround_bugs |=  FF_BUG_NO_PADDING;
297
        else
298
            s->workaround_bugs &= ~FF_BUG_NO_PADDING;
299
    }
300

    
301
    // handle formats which don't have unique end markers
302
    if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
303
        int left= s->gb.size_in_bits - get_bits_count(&s->gb);
304
        int max_extra=7;
305

    
306
        /* no markers in M$ crap */
307
        if(s->msmpeg4_version && s->pict_type==FF_I_TYPE)
308
            max_extra+= 17;
309

    
310
        /* buggy padding but the frame should still end approximately at the bitstream end */
311
        if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_recognition>=3)
312
            max_extra+= 48;
313
        else if((s->workaround_bugs&FF_BUG_NO_PADDING))
314
            max_extra+= 256*256*256*64;
315

    
316
        if(left>max_extra){
317
            av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
318
        }
319
        else if(left<0){
320
            av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
321
        }else
322
            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);
323

    
324
        return 0;
325
    }
326

    
327
    av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
328
            s->gb.size_in_bits - get_bits_count(&s->gb),
329
            show_bits(&s->gb, 24), s->padding_bug_score);
330

    
331
    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);
332

    
333
    return -1;
334
}
335

    
336
int ff_h263_decode_frame(AVCodecContext *avctx,
337
                             void *data, int *data_size,
338
                             AVPacket *avpkt)
339
{
340
    const uint8_t *buf = avpkt->data;
341
    int buf_size = avpkt->size;
342
    MpegEncContext *s = avctx->priv_data;
343
    int ret;
344
    AVFrame *pict = data;
345

    
346
#ifdef PRINT_FRAME_TIME
347
uint64_t time= rdtsc();
348
#endif
349
    s->flags= avctx->flags;
350
    s->flags2= avctx->flags2;
351

    
352
    /* no supplementary picture */
353
    if (buf_size == 0) {
354
        /* special case for last picture */
355
        if (s->low_delay==0 && s->next_picture_ptr) {
356
            *pict= *(AVFrame*)s->next_picture_ptr;
357
            s->next_picture_ptr= NULL;
358

    
359
            *data_size = sizeof(AVFrame);
360
        }
361

    
362
        return 0;
363
    }
364

    
365
    if(s->flags&CODEC_FLAG_TRUNCATED){
366
        int next;
367

    
368
        if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
369
            next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
370
        }else if(CONFIG_H263_DECODER && s->codec_id==CODEC_ID_H263){
371
            next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
372
        }else{
373
            av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
374
            return -1;
375
        }
376

    
377
        if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
378
            return buf_size;
379
    }
380

    
381

    
382
retry:
383

    
384
    if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
385
        init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
386
    }else
387
        init_get_bits(&s->gb, buf, buf_size*8);
388
    s->bitstream_buffer_size=0;
389

    
390
    if (!s->context_initialized) {
391
        if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
392
            return -1;
393
    }
394

    
395
    /* We need to set current_picture_ptr before reading the header,
396
     * otherwise we cannot store anyting in there */
397
    if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
398
        int i= ff_find_unused_picture(s, 0);
399
        s->current_picture_ptr= &s->picture[i];
400
    }
401

    
402
    /* let's go :-) */
403
    if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
404
        ret= ff_wmv2_decode_picture_header(s);
405
    } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
406
        ret = msmpeg4_decode_picture_header(s);
407
    } else if (s->h263_pred) {
408
        if(s->avctx->extradata_size && s->picture_number==0){
409
            GetBitContext gb;
410

    
411
            init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
412
            ret = ff_mpeg4_decode_picture_header(s, &gb);
413
        }
414
        ret = ff_mpeg4_decode_picture_header(s, &s->gb);
415
    } else if (s->codec_id == CODEC_ID_H263I) {
416
        ret = intel_h263_decode_picture_header(s);
417
    } else if (s->h263_flv) {
418
        ret = flv_h263_decode_picture_header(s);
419
    } else {
420
        ret = h263_decode_picture_header(s);
421
    }
422

    
423
    if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
424

    
425
    /* skip if the header was thrashed */
426
    if (ret < 0){
427
        av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
428
        return -1;
429
    }
430

    
431
    avctx->has_b_frames= !s->low_delay;
432

    
433
    if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
434
        if(s->stream_codec_tag == AV_RL32("XVID") ||
435
           s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
436
           s->codec_tag == AV_RL32("RMP4"))
437
            s->xvid_build= -1;
438
#if 0
439
        if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
440
           && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
441
            s->xvid_build= -1;
442
#endif
443
    }
444

    
445
    if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
446
        if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
447
            s->divx_version= 400; //divx 4
448
    }
449

    
450
    if(s->xvid_build && s->divx_version){
451
        s->divx_version=
452
        s->divx_build= 0;
453
    }
454

    
455
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
456
        if(s->codec_tag == AV_RL32("XVIX"))
457
            s->workaround_bugs|= FF_BUG_XVID_ILACE;
458

    
459
        if(s->codec_tag == AV_RL32("UMP4")){
460
            s->workaround_bugs|= FF_BUG_UMP4;
461
        }
462

    
463
        if(s->divx_version>=500 && s->divx_build<1814){
464
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
465
        }
466

    
467
        if(s->divx_version>502 && s->divx_build<1814){
468
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
469
        }
470

    
471
        if(s->xvid_build && s->xvid_build<=3)
472
            s->padding_bug_score= 256*256*256*64;
473

    
474
        if(s->xvid_build && s->xvid_build<=1)
475
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
476

    
477
        if(s->xvid_build && s->xvid_build<=12)
478
            s->workaround_bugs|= FF_BUG_EDGE;
479

    
480
        if(s->xvid_build && s->xvid_build<=32)
481
            s->workaround_bugs|= FF_BUG_DC_CLIP;
482

    
483
#define SET_QPEL_FUNC(postfix1, postfix2) \
484
    s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
485
    s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
486
    s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
487

    
488
        if(s->lavc_build && s->lavc_build<4653)
489
            s->workaround_bugs|= FF_BUG_STD_QPEL;
490

    
491
        if(s->lavc_build && s->lavc_build<4655)
492
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
493

    
494
        if(s->lavc_build && s->lavc_build<4670){
495
            s->workaround_bugs|= FF_BUG_EDGE;
496
        }
497

    
498
        if(s->lavc_build && s->lavc_build<=4712)
499
            s->workaround_bugs|= FF_BUG_DC_CLIP;
500

    
501
        if(s->divx_version)
502
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
503
//printf("padding_bug_score: %d\n", s->padding_bug_score);
504
        if(s->divx_version==501 && s->divx_build==20020416)
505
            s->padding_bug_score= 256*256*256*64;
506

    
507
        if(s->divx_version && s->divx_version<500){
508
            s->workaround_bugs|= FF_BUG_EDGE;
509
        }
510

    
511
        if(s->divx_version)
512
            s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
513
#if 0
514
        if(s->divx_version==500)
515
            s->padding_bug_score= 256*256*256*64;
516

517
        /* very ugly XVID padding bug detection FIXME/XXX solve this differently
518
         * Let us hope this at least works.
519
         */
520
        if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
521
           && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
522
            s->workaround_bugs|= FF_BUG_NO_PADDING;
523

524
        if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
525
            s->workaround_bugs|= FF_BUG_NO_PADDING;
526
#endif
527
    }
528

    
529
    if(s->workaround_bugs& FF_BUG_STD_QPEL){
530
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
531
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
532
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
533
        SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
534
        SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
535
        SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
536

    
537
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
538
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
539
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
540
        SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
541
        SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
542
        SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
543
    }
544

    
545
    if(avctx->debug & FF_DEBUG_BUGS)
546
        av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
547
               s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
548
               s->divx_packed ? "p" : "");
549

    
550
#if 0 // dump bits per frame / qp / complexity
551
{
552
    static FILE *f=NULL;
553
    if(!f) f=fopen("rate_qp_cplx.txt", "w");
554
    fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
555
}
556
#endif
557

    
558
#if HAVE_MMX
559
    if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & FF_MM_MMX)){
560
        avctx->idct_algo= FF_IDCT_XVIDMMX;
561
        avctx->coded_width= 0; // force reinit
562
//        dsputil_init(&s->dsp, avctx);
563
        s->picture_number=0;
564
    }
565
#endif
566

    
567
        /* After H263 & mpeg4 header decode we have the height, width,*/
568
        /* and other parameters. So then we could init the picture   */
569
        /* FIXME: By the way H263 decoder is evolving it should have */
570
        /* an H263EncContext                                         */
571

    
572
    if (   s->width  != avctx->coded_width
573
        || s->height != avctx->coded_height) {
574
        /* H.263 could change picture size any time */
575
        ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
576
        s->parse_context.buffer=0;
577
        MPV_common_end(s);
578
        s->parse_context= pc;
579
    }
580
    if (!s->context_initialized) {
581
        avcodec_set_dimensions(avctx, s->width, s->height);
582

    
583
        goto retry;
584
    }
585

    
586
    if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P || s->codec_id == CODEC_ID_H263I))
587
        s->gob_index = ff_h263_get_gob_height(s);
588

    
589
    // for hurry_up==5
590
    s->current_picture.pict_type= s->pict_type;
591
    s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
592

    
593
    /* skip B-frames if we don't have reference frames */
594
    if(s->last_picture_ptr==NULL && (s->pict_type==FF_B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
595
    /* skip b frames if we are in a hurry */
596
    if(avctx->hurry_up && s->pict_type==FF_B_TYPE) return get_consumed_bytes(s, buf_size);
597
    if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==FF_B_TYPE)
598
       || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=FF_I_TYPE)
599
       ||  avctx->skip_frame >= AVDISCARD_ALL)
600
        return get_consumed_bytes(s, buf_size);
601
    /* skip everything if we are in a hurry>=5 */
602
    if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
603

    
604
    if(s->next_p_frame_damaged){
605
        if(s->pict_type==FF_B_TYPE)
606
            return get_consumed_bytes(s, buf_size);
607
        else
608
            s->next_p_frame_damaged=0;
609
    }
610

    
611
    if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==FF_B_TYPE){
612
        s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
613
        s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
614
    }else if((!s->no_rounding) || s->pict_type==FF_B_TYPE){
615
        s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
616
        s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
617
    }else{
618
        s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
619
        s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
620
    }
621

    
622
    if(MPV_frame_start(s, avctx) < 0)
623
        return -1;
624

    
625
    if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
626
        ff_vdpau_mpeg4_decode_picture(s, buf, buf_size);
627
        goto frame_end;
628
    }
629

    
630
    if (avctx->hwaccel) {
631
        if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
632
            return -1;
633
    }
634

    
635
    ff_er_frame_start(s);
636

    
637
    //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
638
    //which is not available before MPV_frame_start()
639
    if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
640
        ret = ff_wmv2_decode_secondary_picture_header(s);
641
        if(ret<0) return ret;
642
        if(ret==1) goto intrax8_decoded;
643
    }
644

    
645
    /* decode each macroblock */
646
    s->mb_x=0;
647
    s->mb_y=0;
648

    
649
    decode_slice(s);
650
    while(s->mb_y<s->mb_height){
651
        if(s->msmpeg4_version){
652
            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)
653
                break;
654
        }else{
655
            if(ff_h263_resync(s)<0)
656
                break;
657
        }
658

    
659
        if(s->msmpeg4_version<4 && s->h263_pred)
660
            ff_mpeg4_clean_buffers(s);
661

    
662
        decode_slice(s);
663
    }
664

    
665
    if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==FF_I_TYPE)
666
        if(!CONFIG_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){
667
            s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
668
        }
669

    
670
    /* divx 5.01+ bistream reorder stuff */
671
    if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
672
        int current_pos= get_bits_count(&s->gb)>>3;
673
        int startcode_found=0;
674

    
675
        if(buf_size - current_pos > 5){
676
            int i;
677
            for(i=current_pos; i<buf_size-3; i++){
678
                if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
679
                    startcode_found=1;
680
                    break;
681
                }
682
            }
683
        }
684
        if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
685
            startcode_found=1;
686
            current_pos=0;
687
        }
688

    
689
        if(startcode_found){
690
            av_fast_malloc(
691
                &s->bitstream_buffer,
692
                &s->allocated_bitstream_buffer_size,
693
                buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
694
            if (!s->bitstream_buffer)
695
                return AVERROR(ENOMEM);
696
            memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
697
            s->bitstream_buffer_size= buf_size - current_pos;
698
        }
699
    }
700

    
701
intrax8_decoded:
702
    ff_er_frame_end(s);
703

    
704
frame_end:
705
    if (avctx->hwaccel) {
706
        if (avctx->hwaccel->end_frame(avctx) < 0)
707
            return -1;
708
    }
709

    
710
    MPV_frame_end(s);
711

    
712
assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
713
assert(s->current_picture.pict_type == s->pict_type);
714
    if (s->pict_type == FF_B_TYPE || s->low_delay) {
715
        *pict= *(AVFrame*)s->current_picture_ptr;
716
    } else if (s->last_picture_ptr != NULL) {
717
        *pict= *(AVFrame*)s->last_picture_ptr;
718
    }
719

    
720
    if(s->last_picture_ptr || s->low_delay){
721
        *data_size = sizeof(AVFrame);
722
        ff_print_debug_info(s, pict);
723
    }
724

    
725
#ifdef PRINT_FRAME_TIME
726
av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
727
#endif
728

    
729
    return get_consumed_bytes(s, buf_size);
730
}
731

    
732
AVCodec mpeg4_decoder = {
733
    "mpeg4",
734
    CODEC_TYPE_VIDEO,
735
    CODEC_ID_MPEG4,
736
    sizeof(MpegEncContext),
737
    ff_h263_decode_init,
738
    NULL,
739
    ff_h263_decode_end,
740
    ff_h263_decode_frame,
741
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
742
    .flush= ff_mpeg_flush,
743
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
744
    .pix_fmts= ff_hwaccel_pixfmt_list_420,
745
};
746

    
747
AVCodec h263_decoder = {
748
    "h263",
749
    CODEC_TYPE_VIDEO,
750
    CODEC_ID_H263,
751
    sizeof(MpegEncContext),
752
    ff_h263_decode_init,
753
    NULL,
754
    ff_h263_decode_end,
755
    ff_h263_decode_frame,
756
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
757
    .flush= ff_mpeg_flush,
758
    .long_name= NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
759
    .pix_fmts= ff_hwaccel_pixfmt_list_420,
760
};
761

    
762
AVCodec msmpeg4v1_decoder = {
763
    "msmpeg4v1",
764
    CODEC_TYPE_VIDEO,
765
    CODEC_ID_MSMPEG4V1,
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
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"),
773
    .pix_fmts= ff_pixfmt_list_420,
774
};
775

    
776
AVCodec msmpeg4v2_decoder = {
777
    "msmpeg4v2",
778
    CODEC_TYPE_VIDEO,
779
    CODEC_ID_MSMPEG4V2,
780
    sizeof(MpegEncContext),
781
    ff_h263_decode_init,
782
    NULL,
783
    ff_h263_decode_end,
784
    ff_h263_decode_frame,
785
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
786
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"),
787
    .pix_fmts= ff_pixfmt_list_420,
788
};
789

    
790
AVCodec msmpeg4v3_decoder = {
791
    "msmpeg4",
792
    CODEC_TYPE_VIDEO,
793
    CODEC_ID_MSMPEG4V3,
794
    sizeof(MpegEncContext),
795
    ff_h263_decode_init,
796
    NULL,
797
    ff_h263_decode_end,
798
    ff_h263_decode_frame,
799
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
800
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"),
801
    .pix_fmts= ff_pixfmt_list_420,
802
};
803

    
804
AVCodec wmv1_decoder = {
805
    "wmv1",
806
    CODEC_TYPE_VIDEO,
807
    CODEC_ID_WMV1,
808
    sizeof(MpegEncContext),
809
    ff_h263_decode_init,
810
    NULL,
811
    ff_h263_decode_end,
812
    ff_h263_decode_frame,
813
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
814
    .long_name= NULL_IF_CONFIG_SMALL("Windows Media Video 7"),
815
    .pix_fmts= ff_pixfmt_list_420,
816
};
817

    
818
AVCodec h263i_decoder = {
819
    "h263i",
820
    CODEC_TYPE_VIDEO,
821
    CODEC_ID_H263I,
822
    sizeof(MpegEncContext),
823
    ff_h263_decode_init,
824
    NULL,
825
    ff_h263_decode_end,
826
    ff_h263_decode_frame,
827
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
828
    .long_name = NULL_IF_CONFIG_SMALL("Intel H.263"),
829
    .pix_fmts= ff_pixfmt_list_420,
830
};
831

    
832
AVCodec flv_decoder = {
833
    "flv",
834
    CODEC_TYPE_VIDEO,
835
    CODEC_ID_FLV1,
836
    sizeof(MpegEncContext),
837
    ff_h263_decode_init,
838
    NULL,
839
    ff_h263_decode_end,
840
    ff_h263_decode_frame,
841
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
842
    .long_name= NULL_IF_CONFIG_SMALL("Flash Video (FLV) / Sorenson Spark / Sorenson H.263"),
843
    .pix_fmts= ff_pixfmt_list_420,
844
};
845

    
846
#if CONFIG_MPEG4_VDPAU_DECODER
847
AVCodec mpeg4_vdpau_decoder = {
848
    "mpeg4_vdpau",
849
    CODEC_TYPE_VIDEO,
850
    CODEC_ID_MPEG4,
851
    sizeof(MpegEncContext),
852
    ff_h263_decode_init,
853
    NULL,
854
    ff_h263_decode_end,
855
    ff_h263_decode_frame,
856
    CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_HWACCEL_VDPAU,
857
    .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
858
    .pix_fmts= (const enum PixelFormat[]){PIX_FMT_VDPAU_MPEG4, PIX_FMT_NONE},
859
};
860
#endif