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ffmpeg / libavcodec / h263dec.c @ 1b4580d1

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1
/*
2
 * H.263 decoder
3
 * Copyright (c) 2001 Fabrice Bellard
4
 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5
 *
6
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2.1 of the License, or (at your option) any later version.
12
 *
13
 * FFmpeg is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * Lesser General Public License for more details.
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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
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 "flv.h"
39
#include "mpeg4video.h"
40

    
41
//#define DEBUG
42
//#define PRINT_FRAME_TIME
43

    
44
av_cold int ff_h263_decode_init(AVCodecContext *avctx)
45
{
46
    MpegEncContext *s = avctx->priv_data;
47

    
48
    s->avctx = avctx;
49
    s->out_format = FMT_H263;
50

    
51
    s->width  = avctx->coded_width;
52
    s->height = avctx->coded_height;
53
    s->workaround_bugs= avctx->workaround_bugs;
54

    
55
    // set defaults
56
    MPV_decode_defaults(s);
57
    s->quant_precision=5;
58
    s->decode_mb= ff_h263_decode_mb;
59
    s->low_delay= 1;
60
    avctx->pix_fmt= avctx->get_format(avctx, avctx->codec->pix_fmts);
61
    s->unrestricted_mv= 1;
62

    
63
    /* select sub codec */
64
    switch(avctx->codec->id) {
65
    case CODEC_ID_H263:
66
        s->unrestricted_mv= 0;
67
        avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
68
        break;
69
    case CODEC_ID_MPEG4:
70
        break;
71
    case CODEC_ID_MSMPEG4V1:
72
        s->h263_msmpeg4 = 1;
73
        s->h263_pred = 1;
74
        s->msmpeg4_version=1;
75
        break;
76
    case CODEC_ID_MSMPEG4V2:
77
        s->h263_msmpeg4 = 1;
78
        s->h263_pred = 1;
79
        s->msmpeg4_version=2;
80
        break;
81
    case CODEC_ID_MSMPEG4V3:
82
        s->h263_msmpeg4 = 1;
83
        s->h263_pred = 1;
84
        s->msmpeg4_version=3;
85
        break;
86
    case CODEC_ID_WMV1:
87
        s->h263_msmpeg4 = 1;
88
        s->h263_pred = 1;
89
        s->msmpeg4_version=4;
90
        break;
91
    case CODEC_ID_WMV2:
92
        s->h263_msmpeg4 = 1;
93
        s->h263_pred = 1;
94
        s->msmpeg4_version=5;
95
        break;
96
    case CODEC_ID_VC1:
97
    case CODEC_ID_WMV3:
98
        s->h263_msmpeg4 = 1;
99
        s->h263_pred = 1;
100
        s->msmpeg4_version=6;
101
        avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
102
        break;
103
    case CODEC_ID_H263I:
104
        break;
105
    case CODEC_ID_FLV1:
106
        s->h263_flv = 1;
107
        break;
108
    default:
109
        return -1;
110
    }
111
    s->codec_id= avctx->codec->id;
112
    avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
113

    
114
    /* for h263, we allocate the images after having read the header */
115
    if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
116
        if (MPV_common_init(s) < 0)
117
            return -1;
118

    
119
        h263_decode_init_vlc(s);
120

    
121
    return 0;
122
}
123

    
124
av_cold int ff_h263_decode_end(AVCodecContext *avctx)
125
{
126
    MpegEncContext *s = avctx->priv_data;
127

    
128
    MPV_common_end(s);
129
    return 0;
130
}
131

    
132
/**
133
 * returns the number of bytes consumed for building the current frame
134
 */
135
static int get_consumed_bytes(MpegEncContext *s, int buf_size){
136
    int pos= (get_bits_count(&s->gb)+7)>>3;
137

    
138
    if(s->divx_packed || s->avctx->hwaccel){
139
        //we would have to scan through the whole buf to handle the weird reordering ...
140
        return buf_size;
141
    }else if(s->flags&CODEC_FLAG_TRUNCATED){
142
        pos -= s->parse_context.last_index;
143
        if(pos<0) pos=0; // padding is not really read so this might be -1
144
        return pos;
145
    }else{
146
        if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
147
        if(pos+10>buf_size) pos=buf_size; // oops ;)
148

    
149
        return pos;
150
    }
151
}
152

    
153
static int decode_slice(MpegEncContext *s){
154
    const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
155
    const int mb_size= 16>>s->avctx->lowres;
156
    s->last_resync_gb= s->gb;
157
    s->first_slice_line= 1;
158

    
159
    s->resync_mb_x= s->mb_x;
160
    s->resync_mb_y= s->mb_y;
161

    
162
    ff_set_qscale(s, s->qscale);
163

    
164
    if (s->avctx->hwaccel) {
165
        const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
166
        const uint8_t *end  = ff_h263_find_resync_marker(start + 1, s->gb.buffer_end);
167
        skip_bits_long(&s->gb, 8*(end - start));
168
        return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
169
    }
170

    
171
    if(s->partitioned_frame){
172
        const int qscale= s->qscale;
173

    
174
        if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
175
            if(ff_mpeg4_decode_partitions(s) < 0)
176
                return -1;
177
        }
178

    
179
        /* restore variables which were modified */
180
        s->first_slice_line=1;
181
        s->mb_x= s->resync_mb_x;
182
        s->mb_y= s->resync_mb_y;
183
        ff_set_qscale(s, qscale);
184
    }
185

    
186
    for(; s->mb_y < s->mb_height; s->mb_y++) {
187
        /* per-row end of slice checks */
188
        if(s->msmpeg4_version){
189
            if(s->resync_mb_y + s->slice_height == s->mb_y){
190
                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);
191

    
192
                return 0;
193
            }
194
        }
195

    
196
        if(s->msmpeg4_version==1){
197
            s->last_dc[0]=
198
            s->last_dc[1]=
199
            s->last_dc[2]= 128;
200
        }
201

    
202
        ff_init_block_index(s);
203
        for(; s->mb_x < s->mb_width; s->mb_x++) {
204
            int ret;
205

    
206
            ff_update_block_index(s);
207

    
208
            if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
209
                s->first_slice_line=0;
210
            }
211

    
212
            /* DCT & quantize */
213

    
214
            s->mv_dir = MV_DIR_FORWARD;
215
            s->mv_type = MV_TYPE_16X16;
216
//            s->mb_skipped = 0;
217
//printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
218
            ret= s->decode_mb(s, s->block);
219

    
220
            if (s->pict_type!=FF_B_TYPE)
221
                ff_h263_update_motion_val(s);
222

    
223
            if(ret<0){
224
                const int xy= s->mb_x + s->mb_y*s->mb_stride;
225
                if(ret==SLICE_END){
226
                    MPV_decode_mb(s, s->block);
227
                    if(s->loop_filter)
228
                        ff_h263_loop_filter(s);
229

    
230
//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));
231
                    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);
232

    
233
                    s->padding_bug_score--;
234

    
235
                    if(++s->mb_x >= s->mb_width){
236
                        s->mb_x=0;
237
                        ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
238
                        s->mb_y++;
239
                    }
240
                    return 0;
241
                }else if(ret==SLICE_NOEND){
242
                    av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
243
                    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);
244
                    return -1;
245
                }
246
                av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
247
                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);
248

    
249
                return -1;
250
            }
251

    
252
            MPV_decode_mb(s, s->block);
253
            if(s->loop_filter)
254
                ff_h263_loop_filter(s);
255
        }
256

    
257
        ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
258

    
259
        s->mb_x= 0;
260
    }
261

    
262
    assert(s->mb_x==0 && s->mb_y==s->mb_height);
263

    
264
    if(s->codec_id==CODEC_ID_MPEG4
265
       && (s->workaround_bugs&FF_BUG_AUTODETECT)
266
       && get_bits_left(&s->gb) >= 48
267
       && show_bits(&s->gb, 24)==0x4010
268
       && !s->data_partitioning)
269
        s->padding_bug_score+=32;
270

    
271
    /* try to detect the padding bug */
272
    if(      s->codec_id==CODEC_ID_MPEG4
273
       &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
274
       &&    get_bits_left(&s->gb) >=0
275
       &&    get_bits_left(&s->gb) < 48
276
//       &&   !s->resync_marker
277
       &&   !s->data_partitioning){
278

    
279
        const int bits_count= get_bits_count(&s->gb);
280
        const int bits_left = s->gb.size_in_bits - bits_count;
281

    
282
        if(bits_left==0){
283
            s->padding_bug_score+=16;
284
        } else if(bits_left != 1){
285
            int v= show_bits(&s->gb, 8);
286
            v|= 0x7F >> (7-(bits_count&7));
287

    
288
            if(v==0x7F && bits_left<=8)
289
                s->padding_bug_score--;
290
            else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
291
                s->padding_bug_score+= 4;
292
            else
293
                s->padding_bug_score++;
294
        }
295
    }
296

    
297
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
298
        if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/)
299
            s->workaround_bugs |=  FF_BUG_NO_PADDING;
300
        else
301
            s->workaround_bugs &= ~FF_BUG_NO_PADDING;
302
    }
303

    
304
    // handle formats which don't have unique end markers
305
    if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
306
        int left= get_bits_left(&s->gb);
307
        int max_extra=7;
308

    
309
        /* no markers in M$ crap */
310
        if(s->msmpeg4_version && s->pict_type==FF_I_TYPE)
311
            max_extra+= 17;
312

    
313
        /* buggy padding but the frame should still end approximately at the bitstream end */
314
        if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_recognition>=3)
315
            max_extra+= 48;
316
        else if((s->workaround_bugs&FF_BUG_NO_PADDING))
317
            max_extra+= 256*256*256*64;
318

    
319
        if(left>max_extra){
320
            av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
321
        }
322
        else if(left<0){
323
            av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
324
        }else
325
            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);
326

    
327
        return 0;
328
    }
329

    
330
    av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
331
            get_bits_left(&s->gb),
332
            show_bits(&s->gb, 24), s->padding_bug_score);
333

    
334
    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);
335

    
336
    return -1;
337
}
338

    
339
int ff_h263_decode_frame(AVCodecContext *avctx,
340
                             void *data, int *data_size,
341
                             AVPacket *avpkt)
342
{
343
    const uint8_t *buf = avpkt->data;
344
    int buf_size = avpkt->size;
345
    MpegEncContext *s = avctx->priv_data;
346
    int ret;
347
    AVFrame *pict = data;
348

    
349
#ifdef PRINT_FRAME_TIME
350
uint64_t time= rdtsc();
351
#endif
352
    s->flags= avctx->flags;
353
    s->flags2= avctx->flags2;
354

    
355
    /* no supplementary picture */
356
    if (buf_size == 0) {
357
        /* special case for last picture */
358
        if (s->low_delay==0 && s->next_picture_ptr) {
359
            *pict= *(AVFrame*)s->next_picture_ptr;
360
            s->next_picture_ptr= NULL;
361

    
362
            *data_size = sizeof(AVFrame);
363
        }
364

    
365
        return 0;
366
    }
367

    
368
    if(s->flags&CODEC_FLAG_TRUNCATED){
369
        int next;
370

    
371
        if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
372
            next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
373
        }else if(CONFIG_H263_DECODER && s->codec_id==CODEC_ID_H263){
374
            next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
375
        }else{
376
            av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
377
            return -1;
378
        }
379

    
380
        if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
381
            return buf_size;
382
    }
383

    
384

    
385
retry:
386
    if(s->divx_packed && s->xvid_build>=0 && s->bitstream_buffer_size){
387
        int i;
388
        for(i=0; i<buf_size-3; i++){
389
            if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1){
390
                if(buf[i+3]==0xB0)
391
                    s->bitstream_buffer_size=0;
392
                break;
393
            }
394
        }
395
    }
396

    
397
    if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
398
        init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
399
    }else
400
        init_get_bits(&s->gb, buf, buf_size*8);
401
    s->bitstream_buffer_size=0;
402

    
403
    if (!s->context_initialized) {
404
        if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
405
            return -1;
406
    }
407

    
408
    /* We need to set current_picture_ptr before reading the header,
409
     * otherwise we cannot store anyting in there */
410
    if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
411
        int i= ff_find_unused_picture(s, 0);
412
        s->current_picture_ptr= &s->picture[i];
413
    }
414

    
415
    /* let's go :-) */
416
    if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
417
        ret= ff_wmv2_decode_picture_header(s);
418
    } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
419
        ret = msmpeg4_decode_picture_header(s);
420
    } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
421
        if(s->avctx->extradata_size && s->picture_number==0){
422
            GetBitContext gb;
423

    
424
            init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
425
            ret = ff_mpeg4_decode_picture_header(s, &gb);
426
        }
427
        ret = ff_mpeg4_decode_picture_header(s, &s->gb);
428
    } else if (CONFIG_H263I_DECODER && s->codec_id == CODEC_ID_H263I) {
429
        ret = ff_intel_h263_decode_picture_header(s);
430
    } else if (CONFIG_FLV_DECODER && s->h263_flv) {
431
        ret = ff_flv_decode_picture_header(s);
432
    } else {
433
        ret = h263_decode_picture_header(s);
434
    }
435

    
436
    if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
437

    
438
    /* skip if the header was thrashed */
439
    if (ret < 0){
440
        av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
441
        return -1;
442
    }
443

    
444
    avctx->has_b_frames= !s->low_delay;
445

    
446
    if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
447
        if(s->stream_codec_tag == AV_RL32("XVID") ||
448
           s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
449
           s->codec_tag == AV_RL32("RMP4") ||
450
           s->codec_tag == AV_RL32("SIPP")
451
           )
452
            s->xvid_build= 0;
453
#if 0
454
        if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
455
           && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
456
            s->xvid_build= 0;
457
#endif
458
    }
459

    
460
    if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
461
        if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
462
            s->divx_version= 400; //divx 4
463
    }
464

    
465
    if(s->xvid_build>=0 && s->divx_version>=0){
466
        s->divx_version=
467
        s->divx_build= -1;
468
    }
469

    
470
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
471
        if(s->codec_tag == AV_RL32("XVIX"))
472
            s->workaround_bugs|= FF_BUG_XVID_ILACE;
473

    
474
        if(s->codec_tag == AV_RL32("UMP4")){
475
            s->workaround_bugs|= FF_BUG_UMP4;
476
        }
477

    
478
        if(s->divx_version>=500 && s->divx_build<1814){
479
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
480
        }
481

    
482
        if(s->divx_version>502 && s->divx_build<1814){
483
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
484
        }
485

    
486
        if(s->xvid_build<=3U)
487
            s->padding_bug_score= 256*256*256*64;
488

    
489
        if(s->xvid_build<=1U)
490
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
491

    
492
        if(s->xvid_build<=12U)
493
            s->workaround_bugs|= FF_BUG_EDGE;
494

    
495
        if(s->xvid_build<=32U)
496
            s->workaround_bugs|= FF_BUG_DC_CLIP;
497

    
498
#define SET_QPEL_FUNC(postfix1, postfix2) \
499
    s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
500
    s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
501
    s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
502

    
503
        if(s->lavc_build<4653U)
504
            s->workaround_bugs|= FF_BUG_STD_QPEL;
505

    
506
        if(s->lavc_build<4655U)
507
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
508

    
509
        if(s->lavc_build<4670U){
510
            s->workaround_bugs|= FF_BUG_EDGE;
511
        }
512

    
513
        if(s->lavc_build<=4712U)
514
            s->workaround_bugs|= FF_BUG_DC_CLIP;
515

    
516
        if(s->divx_version>=0)
517
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
518
//printf("padding_bug_score: %d\n", s->padding_bug_score);
519
        if(s->divx_version==501 && s->divx_build==20020416)
520
            s->padding_bug_score= 256*256*256*64;
521

    
522
        if(s->divx_version<500U){
523
            s->workaround_bugs|= FF_BUG_EDGE;
524
        }
525

    
526
        if(s->divx_version>=0)
527
            s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
528
#if 0
529
        if(s->divx_version==500)
530
            s->padding_bug_score= 256*256*256*64;
531

532
        /* very ugly XVID padding bug detection FIXME/XXX solve this differently
533
         * Let us hope this at least works.
534
         */
535
        if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1
536
           && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
537
            s->workaround_bugs|= FF_BUG_NO_PADDING;
538

539
        if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok
540
            s->workaround_bugs|= FF_BUG_NO_PADDING;
541
#endif
542
    }
543

    
544
    if(s->workaround_bugs& FF_BUG_STD_QPEL){
545
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
546
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
547
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
548
        SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
549
        SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
550
        SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
551

    
552
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
553
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
554
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
555
        SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
556
        SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
557
        SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
558
    }
559

    
560
    if(avctx->debug & FF_DEBUG_BUGS)
561
        av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
562
               s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
563
               s->divx_packed ? "p" : "");
564

    
565
#if 0 // dump bits per frame / qp / complexity
566
{
567
    static FILE *f=NULL;
568
    if(!f) f=fopen("rate_qp_cplx.txt", "w");
569
    fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
570
}
571
#endif
572

    
573
#if HAVE_MMX
574
    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)) {
575
        avctx->idct_algo= FF_IDCT_XVIDMMX;
576
        avctx->coded_width= 0; // force reinit
577
//        dsputil_init(&s->dsp, avctx);
578
        s->picture_number=0;
579
    }
580
#endif
581

    
582
        /* After H263 & mpeg4 header decode we have the height, width,*/
583
        /* and other parameters. So then we could init the picture   */
584
        /* FIXME: By the way H263 decoder is evolving it should have */
585
        /* an H263EncContext                                         */
586

    
587
    if (   s->width  != avctx->coded_width
588
        || s->height != avctx->coded_height) {
589
        /* H.263 could change picture size any time */
590
        ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
591
        s->parse_context.buffer=0;
592
        MPV_common_end(s);
593
        s->parse_context= pc;
594
    }
595
    if (!s->context_initialized) {
596
        avcodec_set_dimensions(avctx, s->width, s->height);
597

    
598
        goto retry;
599
    }
600

    
601
    if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P || s->codec_id == CODEC_ID_H263I))
602
        s->gob_index = ff_h263_get_gob_height(s);
603

    
604
    // for hurry_up==5
605
    s->current_picture.pict_type= s->pict_type;
606
    s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
607

    
608
    /* skip B-frames if we don't have reference frames */
609
    if(s->last_picture_ptr==NULL && (s->pict_type==FF_B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
610
    /* skip b frames if we are in a hurry */
611
    if(avctx->hurry_up && s->pict_type==FF_B_TYPE) return get_consumed_bytes(s, buf_size);
612
    if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==FF_B_TYPE)
613
       || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=FF_I_TYPE)
614
       ||  avctx->skip_frame >= AVDISCARD_ALL)
615
        return get_consumed_bytes(s, buf_size);
616
    /* skip everything if we are in a hurry>=5 */
617
    if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
618

    
619
    if(s->next_p_frame_damaged){
620
        if(s->pict_type==FF_B_TYPE)
621
            return get_consumed_bytes(s, buf_size);
622
        else
623
            s->next_p_frame_damaged=0;
624
    }
625

    
626
    if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==FF_B_TYPE){
627
        s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
628
        s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
629
    }else if((!s->no_rounding) || s->pict_type==FF_B_TYPE){
630
        s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
631
        s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
632
    }else{
633
        s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
634
        s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
635
    }
636

    
637
    if(MPV_frame_start(s, avctx) < 0)
638
        return -1;
639

    
640
    if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
641
        ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
642
        goto frame_end;
643
    }
644

    
645
    if (avctx->hwaccel) {
646
        if (avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer) < 0)
647
            return -1;
648
    }
649

    
650
    ff_er_frame_start(s);
651

    
652
    //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
653
    //which is not available before MPV_frame_start()
654
    if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
655
        ret = ff_wmv2_decode_secondary_picture_header(s);
656
        if(ret<0) return ret;
657
        if(ret==1) goto intrax8_decoded;
658
    }
659

    
660
    /* decode each macroblock */
661
    s->mb_x=0;
662
    s->mb_y=0;
663

    
664
    decode_slice(s);
665
    while(s->mb_y<s->mb_height){
666
        if(s->msmpeg4_version){
667
            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)
668
                break;
669
        }else{
670
            if(ff_h263_resync(s)<0)
671
                break;
672
        }
673

    
674
        if(s->msmpeg4_version<4 && s->h263_pred)
675
            ff_mpeg4_clean_buffers(s);
676

    
677
        decode_slice(s);
678
    }
679

    
680
    if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==FF_I_TYPE)
681
        if(!CONFIG_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){
682
            s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
683
        }
684

    
685
    assert(s->bitstream_buffer_size==0);
686
frame_end:
687
    /* divx 5.01+ bistream reorder stuff */
688
    if(s->codec_id==CODEC_ID_MPEG4 && s->divx_packed){
689
        int current_pos= get_bits_count(&s->gb)>>3;
690
        int startcode_found=0;
691

    
692
        if(buf_size - current_pos > 5){
693
            int i;
694
            for(i=current_pos; i<buf_size-3; i++){
695
                if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
696
                    startcode_found=1;
697
                    break;
698
                }
699
            }
700
        }
701
        if(s->gb.buffer == s->bitstream_buffer && buf_size>7 && s->xvid_build>=0){ //xvid style
702
            startcode_found=1;
703
            current_pos=0;
704
        }
705

    
706
        if(startcode_found){
707
            av_fast_malloc(
708
                &s->bitstream_buffer,
709
                &s->allocated_bitstream_buffer_size,
710
                buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
711
            if (!s->bitstream_buffer)
712
                return AVERROR(ENOMEM);
713
            memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
714
            s->bitstream_buffer_size= buf_size - current_pos;
715
        }
716
    }
717

    
718
intrax8_decoded:
719
    ff_er_frame_end(s);
720

    
721
    if (avctx->hwaccel) {
722
        if (avctx->hwaccel->end_frame(avctx) < 0)
723
            return -1;
724
    }
725

    
726
    MPV_frame_end(s);
727

    
728
assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
729
assert(s->current_picture.pict_type == s->pict_type);
730
    if (s->pict_type == FF_B_TYPE || s->low_delay) {
731
        *pict= *(AVFrame*)s->current_picture_ptr;
732
    } else if (s->last_picture_ptr != NULL) {
733
        *pict= *(AVFrame*)s->last_picture_ptr;
734
    }
735

    
736
    if(s->last_picture_ptr || s->low_delay){
737
        *data_size = sizeof(AVFrame);
738
        ff_print_debug_info(s, pict);
739
    }
740

    
741
#ifdef PRINT_FRAME_TIME
742
av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
743
#endif
744

    
745
    return get_consumed_bytes(s, buf_size);
746
}
747

    
748
AVCodec ff_h263_decoder = {
749
    "h263",
750
    AVMEDIA_TYPE_VIDEO,
751
    CODEC_ID_H263,
752
    sizeof(MpegEncContext),
753
    ff_h263_decode_init,
754
    NULL,
755
    ff_h263_decode_end,
756
    ff_h263_decode_frame,
757
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
758
    .flush= ff_mpeg_flush,
759
    .max_lowres= 3,
760
    .long_name= NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
761
    .pix_fmts= ff_hwaccel_pixfmt_list_420,
762
};