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ffmpeg / libavcodec / h263dec.c @ 0fd0ef79

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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.
17
 *
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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 "internal.h"
29
#include "avcodec.h"
30
#include "dsputil.h"
31
#include "mpegvideo.h"
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#include "h263.h"
33
#include "h263_parser.h"
34
#include "mpeg4video_parser.h"
35
#include "msmpeg4.h"
36
#include "vdpau_internal.h"
37
#include "flv.h"
38
#include "mpeg4video.h"
39

    
40
//#define DEBUG
41
//#define PRINT_FRAME_TIME
42

    
43
av_cold int ff_h263_decode_init(AVCodecContext *avctx)
44
{
45
    MpegEncContext *s = avctx->priv_data;
46

    
47
    s->avctx = avctx;
48
    s->out_format = FMT_H263;
49

    
50
    s->width  = avctx->coded_width;
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    s->height = avctx->coded_height;
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    s->workaround_bugs= avctx->workaround_bugs;
53

    
54
    // set defaults
55
    MPV_decode_defaults(s);
56
    s->quant_precision=5;
57
    s->decode_mb= ff_h263_decode_mb;
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    s->low_delay= 1;
59
    avctx->pix_fmt= avctx->get_format(avctx, avctx->codec->pix_fmts);
60
    s->unrestricted_mv= 1;
61

    
62
    /* select sub codec */
63
    switch(avctx->codec->id) {
64
    case CODEC_ID_H263:
65
        s->unrestricted_mv= 0;
66
        avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
67
        break;
68
    case CODEC_ID_MPEG4:
69
        break;
70
    case CODEC_ID_MSMPEG4V1:
71
        s->h263_msmpeg4 = 1;
72
        s->h263_pred = 1;
73
        s->msmpeg4_version=1;
74
        break;
75
    case CODEC_ID_MSMPEG4V2:
76
        s->h263_msmpeg4 = 1;
77
        s->h263_pred = 1;
78
        s->msmpeg4_version=2;
79
        break;
80
    case CODEC_ID_MSMPEG4V3:
81
        s->h263_msmpeg4 = 1;
82
        s->h263_pred = 1;
83
        s->msmpeg4_version=3;
84
        break;
85
    case CODEC_ID_WMV1:
86
        s->h263_msmpeg4 = 1;
87
        s->h263_pred = 1;
88
        s->msmpeg4_version=4;
89
        break;
90
    case CODEC_ID_WMV2:
91
        s->h263_msmpeg4 = 1;
92
        s->h263_pred = 1;
93
        s->msmpeg4_version=5;
94
        break;
95
    case CODEC_ID_VC1:
96
    case CODEC_ID_WMV3:
97
        s->h263_msmpeg4 = 1;
98
        s->h263_pred = 1;
99
        s->msmpeg4_version=6;
100
        avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
101
        break;
102
    case CODEC_ID_H263I:
103
        break;
104
    case CODEC_ID_FLV1:
105
        s->h263_flv = 1;
106
        break;
107
    default:
108
        return -1;
109
    }
110
    s->codec_id= avctx->codec->id;
111
    avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
112

    
113
    /* for h263, we allocate the images after having read the header */
114
    if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
115
        if (MPV_common_init(s) < 0)
116
            return -1;
117

    
118
        h263_decode_init_vlc(s);
119

    
120
    return 0;
121
}
122

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

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

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

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

    
148
        return pos;
149
    }
150
}
151

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

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

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

    
163
    if (s->avctx->hwaccel) {
164
        const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
165
        const uint8_t *end  = ff_h263_find_resync_marker(start + 1, s->gb.buffer_end);
166
        skip_bits_long(&s->gb, 8*(end - start));
167
        return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
168
    }
169

    
170
    if(s->partitioned_frame){
171
        const int qscale= s->qscale;
172

    
173
        if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
174
            if(ff_mpeg4_decode_partitions(s) < 0)
175
                return -1;
176
        }
177

    
178
        /* restore variables which were modified */
179
        s->first_slice_line=1;
180
        s->mb_x= s->resync_mb_x;
181
        s->mb_y= s->resync_mb_y;
182
        ff_set_qscale(s, qscale);
183
    }
184

    
185
    for(; s->mb_y < s->mb_height; s->mb_y++) {
186
        /* per-row end of slice checks */
187
        if(s->msmpeg4_version){
188
            if(s->resync_mb_y + s->slice_height == s->mb_y){
189
                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);
190

    
191
                return 0;
192
            }
193
        }
194

    
195
        if(s->msmpeg4_version==1){
196
            s->last_dc[0]=
197
            s->last_dc[1]=
198
            s->last_dc[2]= 128;
199
        }
200

    
201
        ff_init_block_index(s);
202
        for(; s->mb_x < s->mb_width; s->mb_x++) {
203
            int ret;
204

    
205
            ff_update_block_index(s);
206

    
207
            if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
208
                s->first_slice_line=0;
209
            }
210

    
211
            /* DCT & quantize */
212

    
213
            s->mv_dir = MV_DIR_FORWARD;
214
            s->mv_type = MV_TYPE_16X16;
215
//            s->mb_skipped = 0;
216
//printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
217
            ret= s->decode_mb(s, s->block);
218

    
219
            if (s->pict_type!=FF_B_TYPE)
220
                ff_h263_update_motion_val(s);
221

    
222
            if(ret<0){
223
                const int xy= s->mb_x + s->mb_y*s->mb_stride;
224
                if(ret==SLICE_END){
225
                    MPV_decode_mb(s, s->block);
226
                    if(s->loop_filter)
227
                        ff_h263_loop_filter(s);
228

    
229
//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));
230
                    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);
231

    
232
                    s->padding_bug_score--;
233

    
234
                    if(++s->mb_x >= s->mb_width){
235
                        s->mb_x=0;
236
                        ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
237
                        s->mb_y++;
238
                    }
239
                    return 0;
240
                }else if(ret==SLICE_NOEND){
241
                    av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
242
                    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);
243
                    return -1;
244
                }
245
                av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
246
                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);
247

    
248
                return -1;
249
            }
250

    
251
            MPV_decode_mb(s, s->block);
252
            if(s->loop_filter)
253
                ff_h263_loop_filter(s);
254
        }
255

    
256
        ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
257

    
258
        s->mb_x= 0;
259
    }
260

    
261
    assert(s->mb_x==0 && s->mb_y==s->mb_height);
262

    
263
    /* try to detect the padding bug */
264
    if(      s->codec_id==CODEC_ID_MPEG4
265
       &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
266
       &&    get_bits_left(&s->gb) >=0
267
       &&    get_bits_left(&s->gb) < 48
268
//       &&   !s->resync_marker
269
       &&   !s->data_partitioning){
270

    
271
        const int bits_count= get_bits_count(&s->gb);
272
        const int bits_left = s->gb.size_in_bits - bits_count;
273

    
274
        if(bits_left==0){
275
            s->padding_bug_score+=16;
276
        } else if(bits_left != 1){
277
            int v= show_bits(&s->gb, 8);
278
            v|= 0x7F >> (7-(bits_count&7));
279

    
280
            if(v==0x7F && bits_left<=8)
281
                s->padding_bug_score--;
282
            else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
283
                s->padding_bug_score+= 4;
284
            else
285
                s->padding_bug_score++;
286
        }
287
    }
288

    
289
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
290
        if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/)
291
            s->workaround_bugs |=  FF_BUG_NO_PADDING;
292
        else
293
            s->workaround_bugs &= ~FF_BUG_NO_PADDING;
294
    }
295

    
296
    // handle formats which don't have unique end markers
297
    if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
298
        int left= get_bits_left(&s->gb);
299
        int max_extra=7;
300

    
301
        /* no markers in M$ crap */
302
        if(s->msmpeg4_version && s->pict_type==FF_I_TYPE)
303
            max_extra+= 17;
304

    
305
        /* buggy padding but the frame should still end approximately at the bitstream end */
306
        if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_recognition>=3)
307
            max_extra+= 48;
308
        else if((s->workaround_bugs&FF_BUG_NO_PADDING))
309
            max_extra+= 256*256*256*64;
310

    
311
        if(left>max_extra){
312
            av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
313
        }
314
        else if(left<0){
315
            av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
316
        }else
317
            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);
318

    
319
        return 0;
320
    }
321

    
322
    av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
323
            get_bits_left(&s->gb),
324
            show_bits(&s->gb, 24), s->padding_bug_score);
325

    
326
    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);
327

    
328
    return -1;
329
}
330

    
331
int ff_h263_decode_frame(AVCodecContext *avctx,
332
                             void *data, int *data_size,
333
                             AVPacket *avpkt)
334
{
335
    const uint8_t *buf = avpkt->data;
336
    int buf_size = avpkt->size;
337
    MpegEncContext *s = avctx->priv_data;
338
    int ret;
339
    AVFrame *pict = data;
340

    
341
#ifdef PRINT_FRAME_TIME
342
uint64_t time= rdtsc();
343
#endif
344
    s->flags= avctx->flags;
345
    s->flags2= avctx->flags2;
346

    
347
    /* no supplementary picture */
348
    if (buf_size == 0) {
349
        /* special case for last picture */
350
        if (s->low_delay==0 && s->next_picture_ptr) {
351
            *pict= *(AVFrame*)s->next_picture_ptr;
352
            s->next_picture_ptr= NULL;
353

    
354
            *data_size = sizeof(AVFrame);
355
        }
356

    
357
        return 0;
358
    }
359

    
360
    if(s->flags&CODEC_FLAG_TRUNCATED){
361
        int next;
362

    
363
        if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
364
            next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
365
        }else if(CONFIG_H263_DECODER && s->codec_id==CODEC_ID_H263){
366
            next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
367
        }else{
368
            av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
369
            return -1;
370
        }
371

    
372
        if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
373
            return buf_size;
374
    }
375

    
376

    
377
retry:
378

    
379
    if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
380
        init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
381
    }else
382
        init_get_bits(&s->gb, buf, buf_size*8);
383
    s->bitstream_buffer_size=0;
384

    
385
    if (!s->context_initialized) {
386
        if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
387
            return -1;
388
    }
389

    
390
    /* We need to set current_picture_ptr before reading the header,
391
     * otherwise we cannot store anyting in there */
392
    if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
393
        int i= ff_find_unused_picture(s, 0);
394
        s->current_picture_ptr= &s->picture[i];
395
    }
396

    
397
    /* let's go :-) */
398
    if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
399
        ret= ff_wmv2_decode_picture_header(s);
400
    } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
401
        ret = msmpeg4_decode_picture_header(s);
402
    } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
403
        if(s->avctx->extradata_size && s->picture_number==0){
404
            GetBitContext gb;
405

    
406
            init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
407
            ret = ff_mpeg4_decode_picture_header(s, &gb);
408
        }
409
        ret = ff_mpeg4_decode_picture_header(s, &s->gb);
410
    } else if (CONFIG_H263I_DECODER && s->codec_id == CODEC_ID_H263I) {
411
        ret = ff_intel_h263_decode_picture_header(s);
412
    } else if (CONFIG_FLV_DECODER && s->h263_flv) {
413
        ret = ff_flv_decode_picture_header(s);
414
    } else {
415
        ret = h263_decode_picture_header(s);
416
    }
417

    
418
    if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
419

    
420
    /* skip if the header was thrashed */
421
    if (ret < 0){
422
        av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
423
        return -1;
424
    }
425

    
426
    avctx->has_b_frames= !s->low_delay;
427

    
428
    if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
429
        if(s->stream_codec_tag == AV_RL32("XVID") ||
430
           s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
431
           s->codec_tag == AV_RL32("RMP4") ||
432
           s->codec_tag == AV_RL32("SIPP")
433
           )
434
            s->xvid_build= 0;
435
#if 0
436
        if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
437
           && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
438
            s->xvid_build= 0;
439
#endif
440
    }
441

    
442
    if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
443
        if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
444
            s->divx_version= 400; //divx 4
445
    }
446

    
447
    if(s->xvid_build>=0 && s->divx_version>=0){
448
        s->divx_version=
449
        s->divx_build= -1;
450
    }
451

    
452
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
453
        if(s->codec_tag == AV_RL32("XVIX"))
454
            s->workaround_bugs|= FF_BUG_XVID_ILACE;
455

    
456
        if(s->codec_tag == AV_RL32("UMP4")){
457
            s->workaround_bugs|= FF_BUG_UMP4;
458
        }
459

    
460
        if(s->divx_version>=500 && s->divx_build<1814){
461
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
462
        }
463

    
464
        if(s->divx_version>502 && s->divx_build<1814){
465
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
466
        }
467

    
468
        if(s->xvid_build<=3U)
469
            s->padding_bug_score= 256*256*256*64;
470

    
471
        if(s->xvid_build<=1U)
472
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
473

    
474
        if(s->xvid_build<=12U)
475
            s->workaround_bugs|= FF_BUG_EDGE;
476

    
477
        if(s->xvid_build<=32U)
478
            s->workaround_bugs|= FF_BUG_DC_CLIP;
479

    
480
#define SET_QPEL_FUNC(postfix1, postfix2) \
481
    s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
482
    s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
483
    s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
484

    
485
        if(s->lavc_build<4653U)
486
            s->workaround_bugs|= FF_BUG_STD_QPEL;
487

    
488
        if(s->lavc_build<4655U)
489
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
490

    
491
        if(s->lavc_build<4670U){
492
            s->workaround_bugs|= FF_BUG_EDGE;
493
        }
494

    
495
        if(s->lavc_build<=4712U)
496
            s->workaround_bugs|= FF_BUG_DC_CLIP;
497

    
498
        if(s->divx_version>=0)
499
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
500
//printf("padding_bug_score: %d\n", s->padding_bug_score);
501
        if(s->divx_version==501 && s->divx_build==20020416)
502
            s->padding_bug_score= 256*256*256*64;
503

    
504
        if(s->divx_version<500U){
505
            s->workaround_bugs|= FF_BUG_EDGE;
506
        }
507

    
508
        if(s->divx_version>=0)
509
            s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
510
#if 0
511
        if(s->divx_version==500)
512
            s->padding_bug_score= 256*256*256*64;
513

514
        /* very ugly XVID padding bug detection FIXME/XXX solve this differently
515
         * Let us hope this at least works.
516
         */
517
        if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1
518
           && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
519
            s->workaround_bugs|= FF_BUG_NO_PADDING;
520

521
        if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok
522
            s->workaround_bugs|= FF_BUG_NO_PADDING;
523
#endif
524
    }
525

    
526
    if(s->workaround_bugs& FF_BUG_STD_QPEL){
527
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
528
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
529
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
530
        SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
531
        SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
532
        SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
533

    
534
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
535
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
536
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
537
        SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
538
        SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
539
        SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
540
    }
541

    
542
    if(avctx->debug & FF_DEBUG_BUGS)
543
        av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
544
               s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
545
               s->divx_packed ? "p" : "");
546

    
547
#if 0 // dump bits per frame / qp / complexity
548
{
549
    static FILE *f=NULL;
550
    if(!f) f=fopen("rate_qp_cplx.txt", "w");
551
    fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
552
}
553
#endif
554

    
555
#if HAVE_MMX
556
    if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build>=0 && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & FF_MM_MMX)){
557
        avctx->idct_algo= FF_IDCT_XVIDMMX;
558
        avctx->coded_width= 0; // force reinit
559
//        dsputil_init(&s->dsp, avctx);
560
        s->picture_number=0;
561
    }
562
#endif
563

    
564
        /* After H263 & mpeg4 header decode we have the height, width,*/
565
        /* and other parameters. So then we could init the picture   */
566
        /* FIXME: By the way H263 decoder is evolving it should have */
567
        /* an H263EncContext                                         */
568

    
569
    if (   s->width  != avctx->coded_width
570
        || s->height != avctx->coded_height) {
571
        /* H.263 could change picture size any time */
572
        ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
573
        s->parse_context.buffer=0;
574
        MPV_common_end(s);
575
        s->parse_context= pc;
576
    }
577
    if (!s->context_initialized) {
578
        avcodec_set_dimensions(avctx, s->width, s->height);
579

    
580
        goto retry;
581
    }
582

    
583
    if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P || s->codec_id == CODEC_ID_H263I))
584
        s->gob_index = ff_h263_get_gob_height(s);
585

    
586
    // for hurry_up==5
587
    s->current_picture.pict_type= s->pict_type;
588
    s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
589

    
590
    /* skip B-frames if we don't have reference frames */
591
    if(s->last_picture_ptr==NULL && (s->pict_type==FF_B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
592
    /* skip b frames if we are in a hurry */
593
    if(avctx->hurry_up && s->pict_type==FF_B_TYPE) return get_consumed_bytes(s, buf_size);
594
    if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==FF_B_TYPE)
595
       || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=FF_I_TYPE)
596
       ||  avctx->skip_frame >= AVDISCARD_ALL)
597
        return get_consumed_bytes(s, buf_size);
598
    /* skip everything if we are in a hurry>=5 */
599
    if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
600

    
601
    if(s->next_p_frame_damaged){
602
        if(s->pict_type==FF_B_TYPE)
603
            return get_consumed_bytes(s, buf_size);
604
        else
605
            s->next_p_frame_damaged=0;
606
    }
607

    
608
    if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==FF_B_TYPE){
609
        s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
610
        s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
611
    }else if((!s->no_rounding) || s->pict_type==FF_B_TYPE){
612
        s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
613
        s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
614
    }else{
615
        s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
616
        s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
617
    }
618

    
619
    if(MPV_frame_start(s, avctx) < 0)
620
        return -1;
621

    
622
    if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
623
        ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
624
        goto frame_end;
625
    }
626

    
627
    if (avctx->hwaccel) {
628
        if (avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer) < 0)
629
            return -1;
630
    }
631

    
632
    ff_er_frame_start(s);
633

    
634
    //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
635
    //which is not available before MPV_frame_start()
636
    if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
637
        ret = ff_wmv2_decode_secondary_picture_header(s);
638
        if(ret<0) return ret;
639
        if(ret==1) goto intrax8_decoded;
640
    }
641

    
642
    /* decode each macroblock */
643
    s->mb_x=0;
644
    s->mb_y=0;
645

    
646
    decode_slice(s);
647
    while(s->mb_y<s->mb_height){
648
        if(s->msmpeg4_version){
649
            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)
650
                break;
651
        }else{
652
            if(ff_h263_resync(s)<0)
653
                break;
654
        }
655

    
656
        if(s->msmpeg4_version<4 && s->h263_pred)
657
            ff_mpeg4_clean_buffers(s);
658

    
659
        decode_slice(s);
660
    }
661

    
662
    if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==FF_I_TYPE)
663
        if(!CONFIG_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){
664
            s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
665
        }
666

    
667
    assert(s->bitstream_buffer_size==0);
668
frame_end:
669
    /* divx 5.01+ bistream reorder stuff */
670
    if(s->codec_id==CODEC_ID_MPEG4 && s->divx_packed){
671
        int current_pos= get_bits_count(&s->gb)>>3;
672
        int startcode_found=0;
673

    
674
        if(buf_size - current_pos > 5){
675
            int i;
676
            for(i=current_pos; i<buf_size-3; i++){
677
                if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
678
                    startcode_found=1;
679
                    break;
680
                }
681
            }
682
        }
683
        if(s->gb.buffer == s->bitstream_buffer && buf_size>7 && s->xvid_build>=0){ //xvid style
684
            startcode_found=1;
685
            current_pos=0;
686
        }
687

    
688
        if(startcode_found){
689
            av_fast_malloc(
690
                &s->bitstream_buffer,
691
                &s->allocated_bitstream_buffer_size,
692
                buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
693
            if (!s->bitstream_buffer)
694
                return AVERROR(ENOMEM);
695
            memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
696
            s->bitstream_buffer_size= buf_size - current_pos;
697
        }
698
    }
699

    
700
intrax8_decoded:
701
    ff_er_frame_end(s);
702

    
703
    if (avctx->hwaccel) {
704
        if (avctx->hwaccel->end_frame(avctx) < 0)
705
            return -1;
706
    }
707

    
708
    MPV_frame_end(s);
709

    
710
assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
711
assert(s->current_picture.pict_type == s->pict_type);
712
    if (s->pict_type == FF_B_TYPE || s->low_delay) {
713
        *pict= *(AVFrame*)s->current_picture_ptr;
714
    } else if (s->last_picture_ptr != NULL) {
715
        *pict= *(AVFrame*)s->last_picture_ptr;
716
    }
717

    
718
    if(s->last_picture_ptr || s->low_delay){
719
        *data_size = sizeof(AVFrame);
720
        ff_print_debug_info(s, pict);
721
    }
722

    
723
#ifdef PRINT_FRAME_TIME
724
av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
725
#endif
726

    
727
    return get_consumed_bytes(s, buf_size);
728
}
729

    
730
AVCodec h263_decoder = {
731
    "h263",
732
    AVMEDIA_TYPE_VIDEO,
733
    CODEC_ID_H263,
734
    sizeof(MpegEncContext),
735
    ff_h263_decode_init,
736
    NULL,
737
    ff_h263_decode_end,
738
    ff_h263_decode_frame,
739
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
740
    .flush= ff_mpeg_flush,
741
    .max_lowres= 3,
742
    .long_name= NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
743
    .pix_fmts= ff_hwaccel_pixfmt_list_420,
744
};