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ffmpeg / libavcodec / h263dec.c @ b317567c

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1
/*
2
 * H.263 decoder
3
 * Copyright (c) 2001 Fabrice Bellard
4
 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5
 *
6
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2.1 of the License, or (at your option) any later version.
12
 *
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 * FFmpeg is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
22

    
23
/**
24
 * @file libavcodec/h263dec.c
25
 * H.263 decoder.
26
 */
27

    
28
#include "internal.h"
29
#include "avcodec.h"
30
#include "dsputil.h"
31
#include "mpegvideo.h"
32
#include "h263.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;
51
    s->height = avctx->coded_height;
52
    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;
58
    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;
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        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->xvid_build= 0;
433
#if 0
434
        if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
435
           && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
436
            s->xvid_build= 0;
437
#endif
438
    }
439

    
440
    if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
441
        if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
442
            s->divx_version= 400; //divx 4
443
    }
444

    
445
    if(s->xvid_build>=0 && s->divx_version>=0){
446
        s->divx_version=
447
        s->divx_build= -1;
448
    }
449

    
450
    if(s->workaround_bugs&FF_BUG_AUTODETECT){
451
        if(s->codec_tag == AV_RL32("XVIX"))
452
            s->workaround_bugs|= FF_BUG_XVID_ILACE;
453

    
454
        if(s->codec_tag == AV_RL32("UMP4")){
455
            s->workaround_bugs|= FF_BUG_UMP4;
456
        }
457

    
458
        if(s->divx_version>=500 && s->divx_build<1814){
459
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
460
        }
461

    
462
        if(s->divx_version>502 && s->divx_build<1814){
463
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
464
        }
465

    
466
        if(s->xvid_build<=3U)
467
            s->padding_bug_score= 256*256*256*64;
468

    
469
        if(s->xvid_build<=1U)
470
            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
471

    
472
        if(s->xvid_build<=12U)
473
            s->workaround_bugs|= FF_BUG_EDGE;
474

    
475
        if(s->xvid_build<=32U)
476
            s->workaround_bugs|= FF_BUG_DC_CLIP;
477

    
478
#define SET_QPEL_FUNC(postfix1, postfix2) \
479
    s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
480
    s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
481
    s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
482

    
483
        if(s->lavc_build<4653U)
484
            s->workaround_bugs|= FF_BUG_STD_QPEL;
485

    
486
        if(s->lavc_build<4655U)
487
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
488

    
489
        if(s->lavc_build<4670U){
490
            s->workaround_bugs|= FF_BUG_EDGE;
491
        }
492

    
493
        if(s->lavc_build<=4712U)
494
            s->workaround_bugs|= FF_BUG_DC_CLIP;
495

    
496
        if(s->divx_version>=0)
497
            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
498
//printf("padding_bug_score: %d\n", s->padding_bug_score);
499
        if(s->divx_version==501 && s->divx_build==20020416)
500
            s->padding_bug_score= 256*256*256*64;
501

    
502
        if(s->divx_version<500U){
503
            s->workaround_bugs|= FF_BUG_EDGE;
504
        }
505

    
506
        if(s->divx_version>=0)
507
            s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
508
#if 0
509
        if(s->divx_version==500)
510
            s->padding_bug_score= 256*256*256*64;
511

512
        /* very ugly XVID padding bug detection FIXME/XXX solve this differently
513
         * Let us hope this at least works.
514
         */
515
        if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1
516
           && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
517
            s->workaround_bugs|= FF_BUG_NO_PADDING;
518

519
        if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok
520
            s->workaround_bugs|= FF_BUG_NO_PADDING;
521
#endif
522
    }
523

    
524
    if(s->workaround_bugs& FF_BUG_STD_QPEL){
525
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
526
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
527
        SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
528
        SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
529
        SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
530
        SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
531

    
532
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
533
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
534
        SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
535
        SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
536
        SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
537
        SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
538
    }
539

    
540
    if(avctx->debug & FF_DEBUG_BUGS)
541
        av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
542
               s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
543
               s->divx_packed ? "p" : "");
544

    
545
#if 0 // dump bits per frame / qp / complexity
546
{
547
    static FILE *f=NULL;
548
    if(!f) f=fopen("rate_qp_cplx.txt", "w");
549
    fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
550
}
551
#endif
552

    
553
#if HAVE_MMX
554
    if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build>=0 && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & FF_MM_MMX)){
555
        avctx->idct_algo= FF_IDCT_XVIDMMX;
556
        avctx->coded_width= 0; // force reinit
557
//        dsputil_init(&s->dsp, avctx);
558
        s->picture_number=0;
559
    }
560
#endif
561

    
562
        /* After H263 & mpeg4 header decode we have the height, width,*/
563
        /* and other parameters. So then we could init the picture   */
564
        /* FIXME: By the way H263 decoder is evolving it should have */
565
        /* an H263EncContext                                         */
566

    
567
    if (   s->width  != avctx->coded_width
568
        || s->height != avctx->coded_height) {
569
        /* H.263 could change picture size any time */
570
        ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
571
        s->parse_context.buffer=0;
572
        MPV_common_end(s);
573
        s->parse_context= pc;
574
    }
575
    if (!s->context_initialized) {
576
        avcodec_set_dimensions(avctx, s->width, s->height);
577

    
578
        goto retry;
579
    }
580

    
581
    if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P || s->codec_id == CODEC_ID_H263I))
582
        s->gob_index = ff_h263_get_gob_height(s);
583

    
584
    // for hurry_up==5
585
    s->current_picture.pict_type= s->pict_type;
586
    s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
587

    
588
    /* skip B-frames if we don't have reference frames */
589
    if(s->last_picture_ptr==NULL && (s->pict_type==FF_B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
590
    /* skip b frames if we are in a hurry */
591
    if(avctx->hurry_up && s->pict_type==FF_B_TYPE) return get_consumed_bytes(s, buf_size);
592
    if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==FF_B_TYPE)
593
       || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=FF_I_TYPE)
594
       ||  avctx->skip_frame >= AVDISCARD_ALL)
595
        return get_consumed_bytes(s, buf_size);
596
    /* skip everything if we are in a hurry>=5 */
597
    if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
598

    
599
    if(s->next_p_frame_damaged){
600
        if(s->pict_type==FF_B_TYPE)
601
            return get_consumed_bytes(s, buf_size);
602
        else
603
            s->next_p_frame_damaged=0;
604
    }
605

    
606
    if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==FF_B_TYPE){
607
        s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
608
        s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
609
    }else if((!s->no_rounding) || s->pict_type==FF_B_TYPE){
610
        s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
611
        s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
612
    }else{
613
        s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
614
        s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
615
    }
616

    
617
    if(MPV_frame_start(s, avctx) < 0)
618
        return -1;
619

    
620
    if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
621
        ff_vdpau_mpeg4_decode_picture(s, buf, buf_size);
622
        goto frame_end;
623
    }
624

    
625
    if (avctx->hwaccel) {
626
        if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
627
            return -1;
628
    }
629

    
630
    ff_er_frame_start(s);
631

    
632
    //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
633
    //which is not available before MPV_frame_start()
634
    if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
635
        ret = ff_wmv2_decode_secondary_picture_header(s);
636
        if(ret<0) return ret;
637
        if(ret==1) goto intrax8_decoded;
638
    }
639

    
640
    /* decode each macroblock */
641
    s->mb_x=0;
642
    s->mb_y=0;
643

    
644
    decode_slice(s);
645
    while(s->mb_y<s->mb_height){
646
        if(s->msmpeg4_version){
647
            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)
648
                break;
649
        }else{
650
            if(ff_h263_resync(s)<0)
651
                break;
652
        }
653

    
654
        if(s->msmpeg4_version<4 && s->h263_pred)
655
            ff_mpeg4_clean_buffers(s);
656

    
657
        decode_slice(s);
658
    }
659

    
660
    if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==FF_I_TYPE)
661
        if(!CONFIG_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){
662
            s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
663
        }
664

    
665
    assert(s->bitstream_buffer_size==0);
666
    /* divx 5.01+ bistream reorder stuff */
667
    if(s->codec_id==CODEC_ID_MPEG4 && s->divx_packed){
668
        int current_pos= get_bits_count(&s->gb)>>3;
669
        int startcode_found=0;
670

    
671
        if(buf_size - current_pos > 5){
672
            int i;
673
            for(i=current_pos; i<buf_size-3; i++){
674
                if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
675
                    startcode_found=1;
676
                    break;
677
                }
678
            }
679
        }
680
        if(s->gb.buffer == s->bitstream_buffer && buf_size>7 && s->xvid_build>=0){ //xvid style
681
            startcode_found=1;
682
            current_pos=0;
683
        }
684

    
685
        if(startcode_found){
686
            av_fast_malloc(
687
                &s->bitstream_buffer,
688
                &s->allocated_bitstream_buffer_size,
689
                buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
690
            if (!s->bitstream_buffer)
691
                return AVERROR(ENOMEM);
692
            memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
693
            s->bitstream_buffer_size= buf_size - current_pos;
694
        }
695
    }
696

    
697
intrax8_decoded:
698
    ff_er_frame_end(s);
699

    
700
frame_end:
701
    if (avctx->hwaccel) {
702
        if (avctx->hwaccel->end_frame(avctx) < 0)
703
            return -1;
704
    }
705

    
706
    MPV_frame_end(s);
707

    
708
assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
709
assert(s->current_picture.pict_type == s->pict_type);
710
    if (s->pict_type == FF_B_TYPE || s->low_delay) {
711
        *pict= *(AVFrame*)s->current_picture_ptr;
712
    } else if (s->last_picture_ptr != NULL) {
713
        *pict= *(AVFrame*)s->last_picture_ptr;
714
    }
715

    
716
    if(s->last_picture_ptr || s->low_delay){
717
        *data_size = sizeof(AVFrame);
718
        ff_print_debug_info(s, pict);
719
    }
720

    
721
#ifdef PRINT_FRAME_TIME
722
av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
723
#endif
724

    
725
    return get_consumed_bytes(s, buf_size);
726
}
727

    
728
AVCodec h263_decoder = {
729
    "h263",
730
    CODEC_TYPE_VIDEO,
731
    CODEC_ID_H263,
732
    sizeof(MpegEncContext),
733
    ff_h263_decode_init,
734
    NULL,
735
    ff_h263_decode_end,
736
    ff_h263_decode_frame,
737
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
738
    .flush= ff_mpeg_flush,
739
    .long_name= NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
740
    .pix_fmts= ff_hwaccel_pixfmt_list_420,
741
};