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ffmpeg / libavcodec / h263dec.c @ ce5e49b0

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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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 *
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
25
 * H.263 decoder.
26
 */
27

    
28
#include "libavutil/cpu.h"
29
#include "internal.h"
30
#include "avcodec.h"
31
#include "dsputil.h"
32
#include "mpegvideo.h"
33
#include "h263.h"
34
#include "h263_parser.h"
35
#include "mpeg4video_parser.h"
36
#include "msmpeg4.h"
37
#include "vdpau_internal.h"
38
#include "thread.h"
39
#include "flv.h"
40
#include "mpeg4video.h"
41

    
42
//#define DEBUG
43
//#define PRINT_FRAME_TIME
44

    
45
av_cold int ff_h263_decode_init(AVCodecContext *avctx)
46
{
47
    MpegEncContext *s = avctx->priv_data;
48

    
49
    s->avctx = avctx;
50
    s->out_format = FMT_H263;
51

    
52
    s->width  = avctx->coded_width;
53
    s->height = avctx->coded_height;
54
    s->workaround_bugs= avctx->workaround_bugs;
55

    
56
    // set defaults
57
    MPV_decode_defaults(s);
58
    s->quant_precision=5;
59
    s->decode_mb= ff_h263_decode_mb;
60
    s->low_delay= 1;
61
    avctx->pix_fmt= avctx->get_format(avctx, avctx->codec->pix_fmts);
62
    s->unrestricted_mv= 1;
63

    
64
    /* select sub codec */
65
    switch(avctx->codec->id) {
66
    case CODEC_ID_H263:
67
        s->unrestricted_mv= 0;
68
        avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
69
        break;
70
    case CODEC_ID_MPEG4:
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
        h263_decode_init_vlc(s);
121

    
122
    return 0;
123
}
124

    
125
av_cold int ff_h263_decode_end(AVCodecContext *avctx)
126
{
127
    MpegEncContext *s = avctx->priv_data;
128

    
129
    MPV_common_end(s);
130
    return 0;
131
}
132

    
133
/**
134
 * returns the number of bytes consumed for building the current frame
135
 */
136
static int get_consumed_bytes(MpegEncContext *s, int buf_size){
137
    int pos= (get_bits_count(&s->gb)+7)>>3;
138

    
139
    if(s->divx_packed || s->avctx->hwaccel){
140
        //we would have to scan through the whole buf to handle the weird reordering ...
141
        return buf_size;
142
    }else if(s->flags&CODEC_FLAG_TRUNCATED){
143
        pos -= s->parse_context.last_index;
144
        if(pos<0) pos=0; // padding is not really read so this might be -1
145
        return pos;
146
    }else{
147
        if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
148
        if(pos+10>buf_size) pos=buf_size; // oops ;)
149

    
150
        return pos;
151
    }
152
}
153

    
154
static int decode_slice(MpegEncContext *s){
155
    const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
156
    const int mb_size= 16>>s->avctx->lowres;
157
    s->last_resync_gb= s->gb;
158
    s->first_slice_line= 1;
159

    
160
    s->resync_mb_x= s->mb_x;
161
    s->resync_mb_y= s->mb_y;
162

    
163
    ff_set_qscale(s, s->qscale);
164

    
165
    if (s->avctx->hwaccel) {
166
        const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
167
        const uint8_t *end  = ff_h263_find_resync_marker(start + 1, s->gb.buffer_end);
168
        skip_bits_long(&s->gb, 8*(end - start));
169
        return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
170
    }
171

    
172
    if(s->partitioned_frame){
173
        const int qscale= s->qscale;
174

    
175
        if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
176
            if(ff_mpeg4_decode_partitions(s) < 0)
177
                return -1;
178
        }
179

    
180
        /* restore variables which were modified */
181
        s->first_slice_line=1;
182
        s->mb_x= s->resync_mb_x;
183
        s->mb_y= s->resync_mb_y;
184
        ff_set_qscale(s, qscale);
185
    }
186

    
187
    for(; s->mb_y < s->mb_height; s->mb_y++) {
188
        /* per-row end of slice checks */
189
        if(s->msmpeg4_version){
190
            if(s->resync_mb_y + s->slice_height == s->mb_y){
191
                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);
192

    
193
                return 0;
194
            }
195
        }
196

    
197
        if(s->msmpeg4_version==1){
198
            s->last_dc[0]=
199
            s->last_dc[1]=
200
            s->last_dc[2]= 128;
201
        }
202

    
203
        ff_init_block_index(s);
204
        for(; s->mb_x < s->mb_width; s->mb_x++) {
205
            int ret;
206

    
207
            ff_update_block_index(s);
208

    
209
            if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
210
                s->first_slice_line=0;
211
            }
212

    
213
            /* DCT & quantize */
214

    
215
            s->mv_dir = MV_DIR_FORWARD;
216
            s->mv_type = MV_TYPE_16X16;
217
//            s->mb_skipped = 0;
218
//printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
219
            ret= s->decode_mb(s, s->block);
220

    
221
            if (s->pict_type!=AV_PICTURE_TYPE_B)
222
                ff_h263_update_motion_val(s);
223

    
224
            if(ret<0){
225
                const int xy= s->mb_x + s->mb_y*s->mb_stride;
226
                if(ret==SLICE_END){
227
                    MPV_decode_mb(s, s->block);
228
                    if(s->loop_filter)
229
                        ff_h263_loop_filter(s);
230

    
231
//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));
232
                    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);
233

    
234
                    s->padding_bug_score--;
235

    
236
                    if(++s->mb_x >= s->mb_width){
237
                        s->mb_x=0;
238
                        ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
239
                        MPV_report_decode_progress(s);
240
                        s->mb_y++;
241
                    }
242
                    return 0;
243
                }else if(ret==SLICE_NOEND){
244
                    av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
245
                    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);
246
                    return -1;
247
                }
248
                av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
249
                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);
250

    
251
                return -1;
252
            }
253

    
254
            MPV_decode_mb(s, s->block);
255
            if(s->loop_filter)
256
                ff_h263_loop_filter(s);
257
        }
258

    
259
        ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
260
        MPV_report_decode_progress(s);
261

    
262
        s->mb_x= 0;
263
    }
264

    
265
    assert(s->mb_x==0 && s->mb_y==s->mb_height);
266

    
267
    if(s->codec_id==CODEC_ID_MPEG4
268
       && (s->workaround_bugs&FF_BUG_AUTODETECT)
269
       && get_bits_left(&s->gb) >= 48
270
       && show_bits(&s->gb, 24)==0x4010
271
       && !s->data_partitioning)
272
        s->padding_bug_score+=32;
273

    
274
    /* try to detect the padding bug */
275
    if(      s->codec_id==CODEC_ID_MPEG4
276
       &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
277
       &&    get_bits_left(&s->gb) >=0
278
       &&    get_bits_left(&s->gb) < 48
279
//       &&   !s->resync_marker
280
       &&   !s->data_partitioning){
281

    
282
        const int bits_count= get_bits_count(&s->gb);
283
        const int bits_left = s->gb.size_in_bits - bits_count;
284

    
285
        if(bits_left==0){
286
            s->padding_bug_score+=16;
287
        } else if(bits_left != 1){
288
            int v= show_bits(&s->gb, 8);
289
            v|= 0x7F >> (7-(bits_count&7));
290

    
291
            if(v==0x7F && bits_left<=8)
292
                s->padding_bug_score--;
293
            else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
294
                s->padding_bug_score+= 4;
295
            else
296
                s->padding_bug_score++;
297
        }
298
    }
299

    
300
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
301
        if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/)
302
            s->workaround_bugs |=  FF_BUG_NO_PADDING;
303
        else
304
            s->workaround_bugs &= ~FF_BUG_NO_PADDING;
305
    }
306

    
307
    // handle formats which don't have unique end markers
308
    if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
309
        int left= get_bits_left(&s->gb);
310
        int max_extra=7;
311

    
312
        /* no markers in M$ crap */
313
        if(s->msmpeg4_version && s->pict_type==AV_PICTURE_TYPE_I)
314
            max_extra+= 17;
315

    
316
        /* buggy padding but the frame should still end approximately at the bitstream end */
317
        if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_recognition>=3)
318
            max_extra+= 48;
319
        else if((s->workaround_bugs&FF_BUG_NO_PADDING))
320
            max_extra+= 256*256*256*64;
321

    
322
        if(left>max_extra){
323
            av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
324
        }
325
        else if(left<0){
326
            av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
327
        }else
328
            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);
329

    
330
        return 0;
331
    }
332

    
333
    av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
334
            get_bits_left(&s->gb),
335
            show_bits(&s->gb, 24), s->padding_bug_score);
336

    
337
    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);
338

    
339
    return -1;
340
}
341

    
342
int ff_h263_decode_frame(AVCodecContext *avctx,
343
                             void *data, int *data_size,
344
                             AVPacket *avpkt)
345
{
346
    const uint8_t *buf = avpkt->data;
347
    int buf_size = avpkt->size;
348
    MpegEncContext *s = avctx->priv_data;
349
    int ret;
350
    AVFrame *pict = data;
351

    
352
#ifdef PRINT_FRAME_TIME
353
uint64_t time= rdtsc();
354
#endif
355
    s->flags= avctx->flags;
356
    s->flags2= avctx->flags2;
357

    
358
    /* no supplementary picture */
359
    if (buf_size == 0) {
360
        /* special case for last picture */
361
        if (s->low_delay==0 && s->next_picture_ptr) {
362
            *pict= *(AVFrame*)s->next_picture_ptr;
363
            s->next_picture_ptr= NULL;
364

    
365
            *data_size = sizeof(AVFrame);
366
        }
367

    
368
        return 0;
369
    }
370

    
371
    if(s->flags&CODEC_FLAG_TRUNCATED){
372
        int next;
373

    
374
        if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
375
            next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
376
        }else if(CONFIG_H263_DECODER && s->codec_id==CODEC_ID_H263){
377
            next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
378
        }else{
379
            av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
380
            return -1;
381
        }
382

    
383
        if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
384
            return buf_size;
385
    }
386

    
387

    
388
retry:
389
    if(s->divx_packed && s->xvid_build>=0 && s->bitstream_buffer_size){
390
        int i;
391
        for(i=0; i<buf_size-3; i++){
392
            if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1){
393
                if(buf[i+3]==0xB0){
394
                    av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
395
                    s->bitstream_buffer_size=0;
396
                }
397
                break;
398
            }
399
        }
400
    }
401

    
402
    if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
403
        init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
404
    }else
405
        init_get_bits(&s->gb, buf, buf_size*8);
406
    s->bitstream_buffer_size=0;
407

    
408
    if (!s->context_initialized) {
409
        if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
410
            return -1;
411
    }
412

    
413
    /* We need to set current_picture_ptr before reading the header,
414
     * otherwise we cannot store anyting in there */
415
    if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
416
        int i= ff_find_unused_picture(s, 0);
417
        s->current_picture_ptr= &s->picture[i];
418
    }
419

    
420
    /* let's go :-) */
421
    if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
422
        ret= ff_wmv2_decode_picture_header(s);
423
    } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
424
        ret = msmpeg4_decode_picture_header(s);
425
    } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
426
        if(s->avctx->extradata_size && s->picture_number==0){
427
            GetBitContext gb;
428

    
429
            init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
430
            ret = ff_mpeg4_decode_picture_header(s, &gb);
431
        }
432
        ret = ff_mpeg4_decode_picture_header(s, &s->gb);
433
    } else if (CONFIG_H263I_DECODER && s->codec_id == CODEC_ID_H263I) {
434
        ret = ff_intel_h263_decode_picture_header(s);
435
    } else if (CONFIG_FLV_DECODER && s->h263_flv) {
436
        ret = ff_flv_decode_picture_header(s);
437
    } else {
438
        ret = h263_decode_picture_header(s);
439
    }
440

    
441
    if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
442

    
443
    /* skip if the header was thrashed */
444
    if (ret < 0){
445
        av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
446
        return -1;
447
    }
448

    
449
    avctx->has_b_frames= !s->low_delay;
450

    
451
    if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
452
        if(s->stream_codec_tag == AV_RL32("XVID") ||
453
           s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
454
           s->codec_tag == AV_RL32("RMP4") ||
455
           s->codec_tag == AV_RL32("SIPP")
456
           )
457
            s->xvid_build= 0;
458
#if 0
459
        if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
460
           && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
461
            s->xvid_build= 0;
462
#endif
463
    }
464

    
465
    if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
466
        if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
467
            s->divx_version= 400; //divx 4
468
    }
469

    
470
    if(s->xvid_build>=0 && s->divx_version>=0){
471
        s->divx_version=
472
        s->divx_build= -1;
473
    }
474

    
475
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
476
        if(s->codec_tag == AV_RL32("XVIX"))
477
            s->workaround_bugs|= FF_BUG_XVID_ILACE;
478

    
479
        if(s->codec_tag == AV_RL32("UMP4")){
480
            s->workaround_bugs|= FF_BUG_UMP4;
481
        }
482

    
483
        if(s->divx_version>=500 && s->divx_build<1814){
484
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
485
        }
486

    
487
        if(s->divx_version>502 && s->divx_build<1814){
488
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
489
        }
490

    
491
        if(s->xvid_build<=3U)
492
            s->padding_bug_score= 256*256*256*64;
493

    
494
        if(s->xvid_build<=1U)
495
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
496

    
497
        if(s->xvid_build<=12U)
498
            s->workaround_bugs|= FF_BUG_EDGE;
499

    
500
        if(s->xvid_build<=32U)
501
            s->workaround_bugs|= FF_BUG_DC_CLIP;
502

    
503
#define SET_QPEL_FUNC(postfix1, postfix2) \
504
    s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
505
    s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
506
    s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
507

    
508
        if(s->lavc_build<4653U)
509
            s->workaround_bugs|= FF_BUG_STD_QPEL;
510

    
511
        if(s->lavc_build<4655U)
512
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
513

    
514
        if(s->lavc_build<4670U){
515
            s->workaround_bugs|= FF_BUG_EDGE;
516
        }
517

    
518
        if(s->lavc_build<=4712U)
519
            s->workaround_bugs|= FF_BUG_DC_CLIP;
520

    
521
        if(s->divx_version>=0)
522
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
523
//printf("padding_bug_score: %d\n", s->padding_bug_score);
524
        if(s->divx_version==501 && s->divx_build==20020416)
525
            s->padding_bug_score= 256*256*256*64;
526

    
527
        if(s->divx_version<500U){
528
            s->workaround_bugs|= FF_BUG_EDGE;
529
        }
530

    
531
        if(s->divx_version>=0)
532
            s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
533
#if 0
534
        if(s->divx_version==500)
535
            s->padding_bug_score= 256*256*256*64;
536

537
        /* very ugly XVID padding bug detection FIXME/XXX solve this differently
538
         * Let us hope this at least works.
539
         */
540
        if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1
541
           && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
542
            s->workaround_bugs|= FF_BUG_NO_PADDING;
543

544
        if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok
545
            s->workaround_bugs|= FF_BUG_NO_PADDING;
546
#endif
547
    }
548

    
549
    if(s->workaround_bugs& FF_BUG_STD_QPEL){
550
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
551
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
552
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
553
        SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
554
        SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
555
        SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
556

    
557
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
558
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
559
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
560
        SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
561
        SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
562
        SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
563
    }
564

    
565
    if(avctx->debug & FF_DEBUG_BUGS)
566
        av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
567
               s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
568
               s->divx_packed ? "p" : "");
569

    
570
#if HAVE_MMX
571
    if (s->codec_id == CODEC_ID_MPEG4 && s->xvid_build>=0 && avctx->idct_algo == FF_IDCT_AUTO && (av_get_cpu_flags() & AV_CPU_FLAG_MMX)) {
572
        avctx->idct_algo= FF_IDCT_XVIDMMX;
573
        avctx->coded_width= 0; // force reinit
574
//        dsputil_init(&s->dsp, avctx);
575
        s->picture_number=0;
576
    }
577
#endif
578

    
579
        /* After H263 & mpeg4 header decode we have the height, width,*/
580
        /* and other parameters. So then we could init the picture   */
581
        /* FIXME: By the way H263 decoder is evolving it should have */
582
        /* an H263EncContext                                         */
583

    
584
    if (   s->width  != avctx->coded_width
585
        || s->height != avctx->coded_height) {
586
        /* H.263 could change picture size any time */
587
        ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
588
        s->parse_context.buffer=0;
589
        MPV_common_end(s);
590
        s->parse_context= pc;
591
    }
592
    if (!s->context_initialized) {
593
        avcodec_set_dimensions(avctx, s->width, s->height);
594

    
595
        goto retry;
596
    }
597

    
598
    if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P || s->codec_id == CODEC_ID_H263I))
599
        s->gob_index = ff_h263_get_gob_height(s);
600

    
601
    // for skipping the frame
602
    s->current_picture.pict_type= s->pict_type;
603
    s->current_picture.key_frame= s->pict_type == AV_PICTURE_TYPE_I;
604

    
605
    /* skip B-frames if we don't have reference frames */
606
    if(s->last_picture_ptr==NULL && (s->pict_type==AV_PICTURE_TYPE_B || s->dropable)) return get_consumed_bytes(s, buf_size);
607
    if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==AV_PICTURE_TYPE_B)
608
       || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=AV_PICTURE_TYPE_I)
609
       ||  avctx->skip_frame >= AVDISCARD_ALL)
610
        return get_consumed_bytes(s, buf_size);
611

    
612
    if(s->next_p_frame_damaged){
613
        if(s->pict_type==AV_PICTURE_TYPE_B)
614
            return get_consumed_bytes(s, buf_size);
615
        else
616
            s->next_p_frame_damaged=0;
617
    }
618

    
619
    if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==AV_PICTURE_TYPE_B){
620
        s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
621
        s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
622
    }else if((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){
623
        s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
624
        s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
625
    }else{
626
        s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
627
        s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
628
    }
629

    
630
    if(MPV_frame_start(s, avctx) < 0)
631
        return -1;
632

    
633
    if (!s->divx_packed) ff_thread_finish_setup(avctx);
634

    
635
    if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
636
        ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
637
        goto frame_end;
638
    }
639

    
640
    if (avctx->hwaccel) {
641
        if (avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer) < 0)
642
            return -1;
643
    }
644

    
645
    ff_er_frame_start(s);
646

    
647
    //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
648
    //which is not available before MPV_frame_start()
649
    if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
650
        ret = ff_wmv2_decode_secondary_picture_header(s);
651
        if(ret<0) return ret;
652
        if(ret==1) goto intrax8_decoded;
653
    }
654

    
655
    /* decode each macroblock */
656
    s->mb_x=0;
657
    s->mb_y=0;
658

    
659
    decode_slice(s);
660
    while(s->mb_y<s->mb_height){
661
        if(s->msmpeg4_version){
662
            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)
663
                break;
664
        }else{
665
            if(ff_h263_resync(s)<0)
666
                break;
667
        }
668

    
669
        if(s->msmpeg4_version<4 && s->h263_pred)
670
            ff_mpeg4_clean_buffers(s);
671

    
672
        decode_slice(s);
673
    }
674

    
675
    if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==AV_PICTURE_TYPE_I)
676
        if(!CONFIG_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){
677
            s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
678
        }
679

    
680
    assert(s->bitstream_buffer_size==0);
681
frame_end:
682
    /* divx 5.01+ bistream reorder stuff */
683
    if(s->codec_id==CODEC_ID_MPEG4 && s->divx_packed){
684
        int current_pos= get_bits_count(&s->gb)>>3;
685
        int startcode_found=0;
686

    
687
        if(buf_size - current_pos > 5){
688
            int i;
689
            for(i=current_pos; i<buf_size-3; i++){
690
                if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
691
                    startcode_found=1;
692
                    break;
693
                }
694
            }
695
        }
696
        if(s->gb.buffer == s->bitstream_buffer && buf_size>7 && s->xvid_build>=0){ //xvid style
697
            startcode_found=1;
698
            current_pos=0;
699
        }
700

    
701
        if(startcode_found){
702
            av_fast_malloc(
703
                &s->bitstream_buffer,
704
                &s->allocated_bitstream_buffer_size,
705
                buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
706
            if (!s->bitstream_buffer)
707
                return AVERROR(ENOMEM);
708
            memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
709
            s->bitstream_buffer_size= buf_size - current_pos;
710
        }
711
    }
712

    
713
intrax8_decoded:
714
    ff_er_frame_end(s);
715

    
716
    if (avctx->hwaccel) {
717
        if (avctx->hwaccel->end_frame(avctx) < 0)
718
            return -1;
719
    }
720

    
721
    MPV_frame_end(s);
722

    
723
assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
724
assert(s->current_picture.pict_type == s->pict_type);
725
    if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
726
        *pict= *(AVFrame*)s->current_picture_ptr;
727
    } else if (s->last_picture_ptr != NULL) {
728
        *pict= *(AVFrame*)s->last_picture_ptr;
729
    }
730

    
731
    if(s->last_picture_ptr || s->low_delay){
732
        *data_size = sizeof(AVFrame);
733
        ff_print_debug_info(s, pict);
734
    }
735

    
736
#ifdef PRINT_FRAME_TIME
737
av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
738
#endif
739

    
740
    return get_consumed_bytes(s, buf_size);
741
}
742

    
743
AVCodec ff_h263_decoder = {
744
    "h263",
745
    AVMEDIA_TYPE_VIDEO,
746
    CODEC_ID_H263,
747
    sizeof(MpegEncContext),
748
    ff_h263_decode_init,
749
    NULL,
750
    ff_h263_decode_end,
751
    ff_h263_decode_frame,
752
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
753
    .flush= ff_mpeg_flush,
754
    .max_lowres= 3,
755
    .long_name= NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
756
    .pix_fmts= ff_hwaccel_pixfmt_list_420,
757
};