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ffmpeg / libavcodec / h263dec.c @ 2912e87a

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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 Libav.
7
 *
8
 * Libav 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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 * Libav 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 Libav; 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;
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    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

    
387
    if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
388
        init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
389
    }else
390
        init_get_bits(&s->gb, buf, buf_size*8);
391
    s->bitstream_buffer_size=0;
392

    
393
    if (!s->context_initialized) {
394
        if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
395
            return -1;
396
    }
397

    
398
    /* We need to set current_picture_ptr before reading the header,
399
     * otherwise we cannot store anyting in there */
400
    if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
401
        int i= ff_find_unused_picture(s, 0);
402
        s->current_picture_ptr= &s->picture[i];
403
    }
404

    
405
    /* let's go :-) */
406
    if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
407
        ret= ff_wmv2_decode_picture_header(s);
408
    } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
409
        ret = msmpeg4_decode_picture_header(s);
410
    } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
411
        if(s->avctx->extradata_size && s->picture_number==0){
412
            GetBitContext gb;
413

    
414
            init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
415
            ret = ff_mpeg4_decode_picture_header(s, &gb);
416
        }
417
        ret = ff_mpeg4_decode_picture_header(s, &s->gb);
418
    } else if (CONFIG_H263I_DECODER && s->codec_id == CODEC_ID_H263I) {
419
        ret = ff_intel_h263_decode_picture_header(s);
420
    } else if (CONFIG_FLV_DECODER && s->h263_flv) {
421
        ret = ff_flv_decode_picture_header(s);
422
    } else {
423
        ret = h263_decode_picture_header(s);
424
    }
425

    
426
    if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
427

    
428
    /* skip if the header was thrashed */
429
    if (ret < 0){
430
        av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
431
        return -1;
432
    }
433

    
434
    avctx->has_b_frames= !s->low_delay;
435

    
436
    if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
437
        if(s->stream_codec_tag == AV_RL32("XVID") ||
438
           s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
439
           s->codec_tag == AV_RL32("RMP4") ||
440
           s->codec_tag == AV_RL32("SIPP")
441
           )
442
            s->xvid_build= 0;
443
#if 0
444
        if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
445
           && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
446
            s->xvid_build= 0;
447
#endif
448
    }
449

    
450
    if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
451
        if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
452
            s->divx_version= 400; //divx 4
453
    }
454

    
455
    if(s->xvid_build>=0 && s->divx_version>=0){
456
        s->divx_version=
457
        s->divx_build= -1;
458
    }
459

    
460
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
461
        if(s->codec_tag == AV_RL32("XVIX"))
462
            s->workaround_bugs|= FF_BUG_XVID_ILACE;
463

    
464
        if(s->codec_tag == AV_RL32("UMP4")){
465
            s->workaround_bugs|= FF_BUG_UMP4;
466
        }
467

    
468
        if(s->divx_version>=500 && s->divx_build<1814){
469
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
470
        }
471

    
472
        if(s->divx_version>502 && s->divx_build<1814){
473
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
474
        }
475

    
476
        if(s->xvid_build<=3U)
477
            s->padding_bug_score= 256*256*256*64;
478

    
479
        if(s->xvid_build<=1U)
480
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
481

    
482
        if(s->xvid_build<=12U)
483
            s->workaround_bugs|= FF_BUG_EDGE;
484

    
485
        if(s->xvid_build<=32U)
486
            s->workaround_bugs|= FF_BUG_DC_CLIP;
487

    
488
#define SET_QPEL_FUNC(postfix1, postfix2) \
489
    s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
490
    s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
491
    s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
492

    
493
        if(s->lavc_build<4653U)
494
            s->workaround_bugs|= FF_BUG_STD_QPEL;
495

    
496
        if(s->lavc_build<4655U)
497
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
498

    
499
        if(s->lavc_build<4670U){
500
            s->workaround_bugs|= FF_BUG_EDGE;
501
        }
502

    
503
        if(s->lavc_build<=4712U)
504
            s->workaround_bugs|= FF_BUG_DC_CLIP;
505

    
506
        if(s->divx_version>=0)
507
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
508
//printf("padding_bug_score: %d\n", s->padding_bug_score);
509
        if(s->divx_version==501 && s->divx_build==20020416)
510
            s->padding_bug_score= 256*256*256*64;
511

    
512
        if(s->divx_version<500U){
513
            s->workaround_bugs|= FF_BUG_EDGE;
514
        }
515

    
516
        if(s->divx_version>=0)
517
            s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
518
#if 0
519
        if(s->divx_version==500)
520
            s->padding_bug_score= 256*256*256*64;
521

522
        /* very ugly XVID padding bug detection FIXME/XXX solve this differently
523
         * Let us hope this at least works.
524
         */
525
        if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1
526
           && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
527
            s->workaround_bugs|= FF_BUG_NO_PADDING;
528

529
        if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok
530
            s->workaround_bugs|= FF_BUG_NO_PADDING;
531
#endif
532
    }
533

    
534
    if(s->workaround_bugs& FF_BUG_STD_QPEL){
535
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
536
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
537
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
538
        SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
539
        SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
540
        SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
541

    
542
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
543
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
544
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
545
        SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
546
        SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
547
        SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
548
    }
549

    
550
    if(avctx->debug & FF_DEBUG_BUGS)
551
        av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
552
               s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
553
               s->divx_packed ? "p" : "");
554

    
555
#if 0 // dump bits per frame / qp / complexity
556
{
557
    static FILE *f=NULL;
558
    if(!f) f=fopen("rate_qp_cplx.txt", "w");
559
    fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
560
}
561
#endif
562

    
563
#if HAVE_MMX
564
    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)) {
565
        avctx->idct_algo= FF_IDCT_XVIDMMX;
566
        avctx->coded_width= 0; // force reinit
567
//        dsputil_init(&s->dsp, avctx);
568
        s->picture_number=0;
569
    }
570
#endif
571

    
572
        /* After H263 & mpeg4 header decode we have the height, width,*/
573
        /* and other parameters. So then we could init the picture   */
574
        /* FIXME: By the way H263 decoder is evolving it should have */
575
        /* an H263EncContext                                         */
576

    
577
    if (   s->width  != avctx->coded_width
578
        || s->height != avctx->coded_height) {
579
        /* H.263 could change picture size any time */
580
        ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
581
        s->parse_context.buffer=0;
582
        MPV_common_end(s);
583
        s->parse_context= pc;
584
    }
585
    if (!s->context_initialized) {
586
        avcodec_set_dimensions(avctx, s->width, s->height);
587

    
588
        goto retry;
589
    }
590

    
591
    if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P || s->codec_id == CODEC_ID_H263I))
592
        s->gob_index = ff_h263_get_gob_height(s);
593

    
594
    // for hurry_up==5
595
    s->current_picture.pict_type= s->pict_type;
596
    s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
597

    
598
    /* skip B-frames if we don't have reference frames */
599
    if(s->last_picture_ptr==NULL && (s->pict_type==FF_B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
600
    /* skip b frames if we are in a hurry */
601
    if(avctx->hurry_up && s->pict_type==FF_B_TYPE) return get_consumed_bytes(s, buf_size);
602
    if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==FF_B_TYPE)
603
       || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=FF_I_TYPE)
604
       ||  avctx->skip_frame >= AVDISCARD_ALL)
605
        return get_consumed_bytes(s, buf_size);
606
    /* skip everything if we are in a hurry>=5 */
607
    if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
608

    
609
    if(s->next_p_frame_damaged){
610
        if(s->pict_type==FF_B_TYPE)
611
            return get_consumed_bytes(s, buf_size);
612
        else
613
            s->next_p_frame_damaged=0;
614
    }
615

    
616
    if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==FF_B_TYPE){
617
        s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
618
        s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
619
    }else if((!s->no_rounding) || s->pict_type==FF_B_TYPE){
620
        s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
621
        s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
622
    }else{
623
        s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
624
        s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
625
    }
626

    
627
    if(MPV_frame_start(s, avctx) < 0)
628
        return -1;
629

    
630
    if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
631
        ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
632
        goto frame_end;
633
    }
634

    
635
    if (avctx->hwaccel) {
636
        if (avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer) < 0)
637
            return -1;
638
    }
639

    
640
    ff_er_frame_start(s);
641

    
642
    //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
643
    //which is not available before MPV_frame_start()
644
    if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
645
        ret = ff_wmv2_decode_secondary_picture_header(s);
646
        if(ret<0) return ret;
647
        if(ret==1) goto intrax8_decoded;
648
    }
649

    
650
    /* decode each macroblock */
651
    s->mb_x=0;
652
    s->mb_y=0;
653

    
654
    decode_slice(s);
655
    while(s->mb_y<s->mb_height){
656
        if(s->msmpeg4_version){
657
            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)
658
                break;
659
        }else{
660
            if(ff_h263_resync(s)<0)
661
                break;
662
        }
663

    
664
        if(s->msmpeg4_version<4 && s->h263_pred)
665
            ff_mpeg4_clean_buffers(s);
666

    
667
        decode_slice(s);
668
    }
669

    
670
    if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==FF_I_TYPE)
671
        if(!CONFIG_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){
672
            s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
673
        }
674

    
675
    assert(s->bitstream_buffer_size==0);
676
frame_end:
677
    /* divx 5.01+ bistream reorder stuff */
678
    if(s->codec_id==CODEC_ID_MPEG4 && s->divx_packed){
679
        int current_pos= get_bits_count(&s->gb)>>3;
680
        int startcode_found=0;
681

    
682
        if(buf_size - current_pos > 5){
683
            int i;
684
            for(i=current_pos; i<buf_size-3; i++){
685
                if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
686
                    startcode_found=1;
687
                    break;
688
                }
689
            }
690
        }
691
        if(s->gb.buffer == s->bitstream_buffer && buf_size>7 && s->xvid_build>=0){ //xvid style
692
            startcode_found=1;
693
            current_pos=0;
694
        }
695

    
696
        if(startcode_found){
697
            av_fast_malloc(
698
                &s->bitstream_buffer,
699
                &s->allocated_bitstream_buffer_size,
700
                buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
701
            if (!s->bitstream_buffer)
702
                return AVERROR(ENOMEM);
703
            memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
704
            s->bitstream_buffer_size= buf_size - current_pos;
705
        }
706
    }
707

    
708
intrax8_decoded:
709
    ff_er_frame_end(s);
710

    
711
    if (avctx->hwaccel) {
712
        if (avctx->hwaccel->end_frame(avctx) < 0)
713
            return -1;
714
    }
715

    
716
    MPV_frame_end(s);
717

    
718
assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
719
assert(s->current_picture.pict_type == s->pict_type);
720
    if (s->pict_type == FF_B_TYPE || s->low_delay) {
721
        *pict= *(AVFrame*)s->current_picture_ptr;
722
    } else if (s->last_picture_ptr != NULL) {
723
        *pict= *(AVFrame*)s->last_picture_ptr;
724
    }
725

    
726
    if(s->last_picture_ptr || s->low_delay){
727
        *data_size = sizeof(AVFrame);
728
        ff_print_debug_info(s, pict);
729
    }
730

    
731
#ifdef PRINT_FRAME_TIME
732
av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
733
#endif
734

    
735
    return get_consumed_bytes(s, buf_size);
736
}
737

    
738
AVCodec ff_h263_decoder = {
739
    "h263",
740
    AVMEDIA_TYPE_VIDEO,
741
    CODEC_ID_H263,
742
    sizeof(MpegEncContext),
743
    ff_h263_decode_init,
744
    NULL,
745
    ff_h263_decode_end,
746
    ff_h263_decode_frame,
747
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
748
    .flush= ff_mpeg_flush,
749
    .max_lowres= 3,
750
    .long_name= NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
751
    .pix_fmts= ff_hwaccel_pixfmt_list_420,
752
};