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1
/*
2
 * utils for libavcodec
3
 * Copyright (c) 2001 Fabrice Bellard.
4
 *
5
 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
7
 * License as published by the Free Software Foundation; either
8
 * version 2 of the License, or (at your option) any later version.
9
 *
10
 * This library is distributed in the hope that it will be useful,
11
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
14
 *
15
 * You should have received a copy of the GNU Lesser General Public
16
 * License along with this library; if not, write to the Free Software
17
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18
 */
19
 
20
/**
21
 * @file utils.c
22
 * utils.
23
 */
24
 
25
#include "avcodec.h"
26
#include "dsputil.h"
27
#include "mpegvideo.h"
28

    
29
void *av_mallocz(unsigned int size)
30
{
31
    void *ptr;
32
    
33
    ptr = av_malloc(size);
34
    if (!ptr)
35
        return NULL;
36
    memset(ptr, 0, size);
37
    return ptr;
38
}
39

    
40
char *av_strdup(const char *s)
41
{
42
    char *ptr;
43
    int len;
44
    len = strlen(s) + 1;
45
    ptr = av_malloc(len);
46
    if (!ptr)
47
        return NULL;
48
    memcpy(ptr, s, len);
49
    return ptr;
50
}
51

    
52
/**
53
 * realloc which does nothing if the block is large enough
54
 */
55
void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size)
56
{
57
    if(min_size < *size) 
58
        return ptr;
59
    
60
    *size= min_size + 10*1024;
61

    
62
    return av_realloc(ptr, *size);
63
}
64

    
65

    
66
/* allocation of static arrays - do not use for normal allocation */
67
static unsigned int last_static = 0;
68
static char*** array_static = NULL;
69
static const unsigned int grow_static = 64; // ^2
70
void *__av_mallocz_static(void** location, unsigned int size)
71
{
72
    unsigned int l = (last_static + grow_static) & ~(grow_static - 1);
73
    void *ptr = av_mallocz(size);
74
    if (!ptr)
75
        return NULL;
76

    
77
    if (location)
78
    {
79
        if (l > last_static)
80
            array_static = av_realloc(array_static, l);
81
        array_static[last_static++] = (char**) location;
82
        *location = ptr;
83
    }
84
    return ptr;
85
}
86
/* free all static arrays and reset pointers to 0 */
87
void av_free_static()
88
{
89
    if (array_static)
90
    {
91
        unsigned i;
92
        for (i = 0; i < last_static; i++)
93
        {
94
            av_free(*array_static[i]);
95
            *array_static[i] = NULL;
96
        }
97
        av_free(array_static);
98
        array_static = 0;
99
    }
100
    last_static = 0;
101
}
102

    
103
/* cannot call it directly because of 'void **' casting is not automatic */
104
void __av_freep(void **ptr)
105
{
106
    av_free(*ptr);
107
    *ptr = NULL;
108
}
109

    
110
/* encoder management */
111
AVCodec *first_avcodec;
112

    
113
void register_avcodec(AVCodec *format)
114
{
115
    AVCodec **p;
116
    p = &first_avcodec;
117
    while (*p != NULL) p = &(*p)->next;
118
    *p = format;
119
    format->next = NULL;
120
}
121

    
122
typedef struct DefaultPicOpaque{
123
    int last_pic_num;
124
    uint8_t *data[4];
125
}DefaultPicOpaque;
126

    
127
int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
128
    int i;
129
    const int width = s->width;
130
    const int height= s->height;
131
    DefaultPicOpaque *opaque;
132
    
133
    assert(pic->data[0]==NULL);
134
    assert(pic->type==0 || pic->type==FF_BUFFER_TYPE_INTERNAL);
135

    
136
    if(pic->opaque){
137
        opaque= (DefaultPicOpaque *)pic->opaque;
138
        for(i=0; i<3; i++)
139
            pic->data[i]= opaque->data[i];
140

    
141
//    printf("get_buffer %X coded_pic_num:%d last:%d\n", pic->opaque, pic->coded_picture_number, opaque->last_pic_num);    
142
        pic->age= pic->coded_picture_number - opaque->last_pic_num;
143
        opaque->last_pic_num= pic->coded_picture_number;
144
//printf("age: %d %d %d\n", pic->age, c->picture_number, pic->coded_picture_number);
145
    }else{
146
        int align, h_chroma_shift, v_chroma_shift;
147
        int w, h, pixel_size;
148
        
149
        avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
150
        
151
        switch(s->pix_fmt){
152
        case PIX_FMT_YUV422:
153
            pixel_size=2;
154
            break;
155
        case PIX_FMT_RGB24:
156
        case PIX_FMT_BGR24:
157
            pixel_size=3;
158
            break;
159
        case PIX_FMT_RGBA32:
160
            pixel_size=4;
161
            break;
162
        default:
163
            pixel_size=1;
164
        }
165
        
166
        if(s->codec_id==CODEC_ID_SVQ1) align=63;
167
        else                           align=15;
168
    
169
        w= (width +align)&~align;
170
        h= (height+align)&~align;
171
    
172
        if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
173
            w+= EDGE_WIDTH*2;
174
            h+= EDGE_WIDTH*2;
175
        }
176
        
177
        opaque= av_mallocz(sizeof(DefaultPicOpaque));
178
        if(opaque==NULL) return -1;
179

    
180
        pic->opaque= opaque;
181
        opaque->last_pic_num= -256*256*256*64;
182

    
183
        for(i=0; i<3; i++){
184
            const int h_shift= i==0 ? 0 : h_chroma_shift;
185
            const int v_shift= i==0 ? 0 : v_chroma_shift;
186

    
187
            pic->linesize[i]= pixel_size*w>>h_shift;
188

    
189
            pic->base[i]= av_mallocz((pic->linesize[i]*h>>v_shift)+16); //FIXME 16
190
            if(pic->base[i]==NULL) return -1;
191

    
192
            memset(pic->base[i], 128, pic->linesize[i]*h>>v_shift);
193
        
194
            if(s->flags&CODEC_FLAG_EMU_EDGE)
195
                pic->data[i] = pic->base[i];
196
            else
197
                pic->data[i] = pic->base[i] + (pic->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift);
198
            
199
            opaque->data[i]= pic->data[i];
200
        }
201
        pic->age= 256*256*256*64;
202
        pic->type= FF_BUFFER_TYPE_INTERNAL;
203
    }
204

    
205
    return 0;
206
}
207

    
208
void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
209
    int i;
210
    
211
    assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
212
    
213
    for(i=0; i<3; i++)
214
        pic->data[i]=NULL;
215
//printf("R%X\n", pic->opaque);
216
}
217

    
218
enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, enum PixelFormat * fmt){
219
    return fmt[0];
220
}
221

    
222
void avcodec_get_context_defaults(AVCodecContext *s){
223
    s->bit_rate= 800*1000;
224
    s->bit_rate_tolerance= s->bit_rate*10;
225
    s->qmin= 2;
226
    s->qmax= 31;
227
    s->mb_qmin= 2;
228
    s->mb_qmax= 31;
229
    s->rc_eq= "tex^qComp";
230
    s->qcompress= 0.5;
231
    s->max_qdiff= 3;
232
    s->b_quant_factor=1.25;
233
    s->b_quant_offset=1.25;
234
    s->i_quant_factor=-0.8;
235
    s->i_quant_offset=0.0;
236
    s->error_concealment= 3;
237
    s->error_resilience= 1;
238
    s->workaround_bugs= FF_BUG_AUTODETECT;
239
    s->frame_rate_base= 1;
240
    s->frame_rate = 25;
241
    s->gop_size= 50;
242
    s->me_method= ME_EPZS;
243
    s->get_buffer= avcodec_default_get_buffer;
244
    s->release_buffer= avcodec_default_release_buffer;
245
    s->get_format= avcodec_default_get_format;
246
    s->me_subpel_quality=8;
247
    
248
    s->intra_quant_bias= FF_DEFAULT_QUANT_BIAS;
249
    s->inter_quant_bias= FF_DEFAULT_QUANT_BIAS;
250
}
251

    
252
/**
253
 * allocates a AVCodecContext and set it to defaults.
254
 * this can be deallocated by simply calling free() 
255
 */
256
AVCodecContext *avcodec_alloc_context(void){
257
    AVCodecContext *avctx= av_mallocz(sizeof(AVCodecContext));
258
    
259
    if(avctx==NULL) return NULL;
260
    
261
    avcodec_get_context_defaults(avctx);
262
    
263
    return avctx;
264
}
265

    
266
/**
267
 * allocates a AVPFrame and set it to defaults.
268
 * this can be deallocated by simply calling free() 
269
 */
270
AVFrame *avcodec_alloc_frame(void){
271
    AVFrame *pic= av_mallocz(sizeof(AVFrame));
272
    
273
    return pic;
274
}
275

    
276
int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
277
{
278
    int ret;
279

    
280
    avctx->codec = codec;
281
    avctx->codec_id = codec->id;
282
    avctx->frame_number = 0;
283
    if (codec->priv_data_size > 0) {
284
        avctx->priv_data = av_mallocz(codec->priv_data_size);
285
        if (!avctx->priv_data) 
286
            return -ENOMEM;
287
    } else {
288
        avctx->priv_data = NULL;
289
    }
290
    ret = avctx->codec->init(avctx);
291
    if (ret < 0) {
292
        av_freep(&avctx->priv_data);
293
        return ret;
294
    }
295
    return 0;
296
}
297

    
298
int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size, 
299
                         const short *samples)
300
{
301
    int ret;
302

    
303
    ret = avctx->codec->encode(avctx, buf, buf_size, (void *)samples);
304
    avctx->frame_number++;
305
    return ret;
306
}
307

    
308
int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size, 
309
                         const AVFrame *pict)
310
{
311
    int ret;
312

    
313
    ret = avctx->codec->encode(avctx, buf, buf_size, (void *)pict);
314
    
315
    emms_c(); //needed to avoid a emms_c() call before every return;
316

    
317
    avctx->frame_number++;
318
    return ret;
319
}
320

    
321
/* decode a frame. return -1 if error, otherwise return the number of
322
   bytes used. If no frame could be decompressed, *got_picture_ptr is
323
   zero. Otherwise, it is non zero */
324
int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture, 
325
                         int *got_picture_ptr,
326
                         uint8_t *buf, int buf_size)
327
{
328
    int ret;
329
    
330
    ret = avctx->codec->decode(avctx, picture, got_picture_ptr, 
331
                               buf, buf_size);
332

    
333
    emms_c(); //needed to avoid a emms_c() call before every return;
334
    
335
    if (*got_picture_ptr)                           
336
        avctx->frame_number++;
337
    return ret;
338
}
339

    
340
/* decode an audio frame. return -1 if error, otherwise return the
341
   *number of bytes used. If no frame could be decompressed,
342
   *frame_size_ptr is zero. Otherwise, it is the decompressed frame
343
   *size in BYTES. */
344
int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples, 
345
                         int *frame_size_ptr,
346
                         uint8_t *buf, int buf_size)
347
{
348
    int ret;
349

    
350
    ret = avctx->codec->decode(avctx, samples, frame_size_ptr, 
351
                               buf, buf_size);
352
    avctx->frame_number++;
353
    return ret;
354
}
355

    
356
int avcodec_close(AVCodecContext *avctx)
357
{
358
    if (avctx->codec->close)
359
        avctx->codec->close(avctx);
360
    av_freep(&avctx->priv_data);
361
    avctx->codec = NULL;
362
    return 0;
363
}
364

    
365
AVCodec *avcodec_find_encoder(enum CodecID id)
366
{
367
    AVCodec *p;
368
    p = first_avcodec;
369
    while (p) {
370
        if (p->encode != NULL && p->id == id)
371
            return p;
372
        p = p->next;
373
    }
374
    return NULL;
375
}
376

    
377
AVCodec *avcodec_find_encoder_by_name(const char *name)
378
{
379
    AVCodec *p;
380
    p = first_avcodec;
381
    while (p) {
382
        if (p->encode != NULL && strcmp(name,p->name) == 0)
383
            return p;
384
        p = p->next;
385
    }
386
    return NULL;
387
}
388

    
389
AVCodec *avcodec_find_decoder(enum CodecID id)
390
{
391
    AVCodec *p;
392
    p = first_avcodec;
393
    while (p) {
394
        if (p->decode != NULL && p->id == id)
395
            return p;
396
        p = p->next;
397
    }
398
    return NULL;
399
}
400

    
401
AVCodec *avcodec_find_decoder_by_name(const char *name)
402
{
403
    AVCodec *p;
404
    p = first_avcodec;
405
    while (p) {
406
        if (p->decode != NULL && strcmp(name,p->name) == 0)
407
            return p;
408
        p = p->next;
409
    }
410
    return NULL;
411
}
412

    
413
AVCodec *avcodec_find(enum CodecID id)
414
{
415
    AVCodec *p;
416
    p = first_avcodec;
417
    while (p) {
418
        if (p->id == id)
419
            return p;
420
        p = p->next;
421
    }
422
    return NULL;
423
}
424

    
425
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
426
{
427
    const char *codec_name;
428
    AVCodec *p;
429
    char buf1[32];
430
    char channels_str[100];
431
    int bitrate;
432

    
433
    if (encode)
434
        p = avcodec_find_encoder(enc->codec_id);
435
    else
436
        p = avcodec_find_decoder(enc->codec_id);
437

    
438
    if (p) {
439
        codec_name = p->name;
440
    } else if (enc->codec_name[0] != '\0') {
441
        codec_name = enc->codec_name;
442
    } else {
443
        /* output avi tags */
444
        if (enc->codec_type == CODEC_TYPE_VIDEO) {
445
            snprintf(buf1, sizeof(buf1), "%c%c%c%c", 
446
                     enc->codec_tag & 0xff,
447
                     (enc->codec_tag >> 8) & 0xff,
448
                     (enc->codec_tag >> 16) & 0xff,
449
                     (enc->codec_tag >> 24) & 0xff);
450
        } else {
451
            snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
452
        }
453
        codec_name = buf1;
454
    }
455

    
456
    switch(enc->codec_type) {
457
    case CODEC_TYPE_VIDEO:
458
        snprintf(buf, buf_size,
459
                 "Video: %s%s",
460
                 codec_name, enc->flags & CODEC_FLAG_HQ ? " (hq)" : "");
461
        if (enc->codec_id == CODEC_ID_RAWVIDEO) {
462
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
463
                     ", %s",
464
                     avcodec_get_pix_fmt_name(enc->pix_fmt));
465
        }
466
        if (enc->width) {
467
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
468
                     ", %dx%d, %0.2f fps",
469
                     enc->width, enc->height, 
470
                     (float)enc->frame_rate / enc->frame_rate_base);
471
        }
472
        if (encode) {
473
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
474
                     ", q=%d-%d", enc->qmin, enc->qmax);
475
        }
476
        bitrate = enc->bit_rate;
477
        break;
478
    case CODEC_TYPE_AUDIO:
479
        snprintf(buf, buf_size,
480
                 "Audio: %s",
481
                 codec_name);
482
        switch (enc->channels) {
483
            case 1:
484
                strcpy(channels_str, "mono");
485
                break;
486
            case 2:
487
                strcpy(channels_str, "stereo");
488
                break;
489
            case 6:
490
                strcpy(channels_str, "5:1");
491
                break;
492
            default:
493
                sprintf(channels_str, "%d channels", enc->channels);
494
                break;
495
        }
496
        if (enc->sample_rate) {
497
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
498
                     ", %d Hz, %s",
499
                     enc->sample_rate,
500
                     channels_str);
501
        }
502
        
503
        /* for PCM codecs, compute bitrate directly */
504
        switch(enc->codec_id) {
505
        case CODEC_ID_PCM_S16LE:
506
        case CODEC_ID_PCM_S16BE:
507
        case CODEC_ID_PCM_U16LE:
508
        case CODEC_ID_PCM_U16BE:
509
            bitrate = enc->sample_rate * enc->channels * 16;
510
            break;
511
        case CODEC_ID_PCM_S8:
512
        case CODEC_ID_PCM_U8:
513
        case CODEC_ID_PCM_ALAW:
514
        case CODEC_ID_PCM_MULAW:
515
            bitrate = enc->sample_rate * enc->channels * 8;
516
            break;
517
        default:
518
            bitrate = enc->bit_rate;
519
            break;
520
        }
521
        break;
522
    default:
523
        av_abort();
524
    }
525
    if (encode) {
526
        if (enc->flags & CODEC_FLAG_PASS1)
527
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
528
                     ", pass 1");
529
        if (enc->flags & CODEC_FLAG_PASS2)
530
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
531
                     ", pass 2");
532
    }
533
    if (bitrate != 0) {
534
        snprintf(buf + strlen(buf), buf_size - strlen(buf), 
535
                 ", %d kb/s", bitrate / 1000);
536
    }
537
}
538

    
539
unsigned avcodec_version( void )
540
{
541
  return LIBAVCODEC_VERSION_INT;
542
}
543

    
544
unsigned avcodec_build( void )
545
{
546
  return LIBAVCODEC_BUILD;
547
}
548

    
549
/* must be called before any other functions */
550
void avcodec_init(void)
551
{
552
    static int inited = 0;
553

    
554
    if (inited != 0)
555
        return;
556
    inited = 1;
557

    
558
    //dsputil_init();
559
}
560

    
561
/* this can be called after seeking and before trying to decode the next keyframe */
562
void avcodec_flush_buffers(AVCodecContext *avctx)
563
{
564
    int i;
565
    MpegEncContext *s = avctx->priv_data;
566
    
567
    switch(avctx->codec_id){
568
    case CODEC_ID_MPEG1VIDEO:
569
    case CODEC_ID_H263:
570
    case CODEC_ID_RV10:
571
    case CODEC_ID_MJPEG:
572
    case CODEC_ID_MJPEGB:
573
    case CODEC_ID_MPEG4:
574
    case CODEC_ID_MSMPEG4V1:
575
    case CODEC_ID_MSMPEG4V2:
576
    case CODEC_ID_MSMPEG4V3:
577
    case CODEC_ID_WMV1:
578
    case CODEC_ID_WMV2:
579
    case CODEC_ID_H263P:
580
    case CODEC_ID_H263I:
581
    case CODEC_ID_SVQ1:
582
        for(i=0; i<MAX_PICTURE_COUNT; i++){
583
           if(s->picture[i].data[0] && (   s->picture[i].type == FF_BUFFER_TYPE_INTERNAL
584
                                        || s->picture[i].type == FF_BUFFER_TYPE_USER))
585
            avctx->release_buffer(avctx, (AVFrame*)&s->picture[i]);
586
        }
587
        s->last_picture_ptr = s->next_picture_ptr = NULL;
588
        break;
589
    default:
590
        //FIXME
591
        break;
592
    }
593
}
594

    
595
int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
596
    int exact=1, sign=0;
597
    int64_t gcd, larger;
598

    
599
    assert(den != 0);
600

    
601
    if(den < 0){
602
        den= -den;
603
        nom= -nom;
604
    }
605
    
606
    if(nom < 0){
607
        nom= -nom;
608
        sign= 1;
609
    }
610
    
611
    for(;;){ //note is executed 1 or 2 times 
612
        gcd = ff_gcd(nom, den);
613
        nom /= gcd;
614
        den /= gcd;
615
    
616
        larger= FFMAX(nom, den);
617
    
618
        if(larger > max){
619
            int64_t div= (larger + max - 1) / max;
620
            nom =  (nom + div/2)/div;
621
            den =  (den + div/2)/div;
622
            exact=0;
623
        }else 
624
            break;
625
    }
626
    
627
    if(sign) nom= -nom;
628
    
629
    *dst_nom = nom;
630
    *dst_den = den;
631
    
632
    return exact;
633
}
634

    
635
int64_t av_rescale(int64_t a, int b, int c){
636
    uint64_t h, l;
637
    assert(c > 0);
638
    assert(b >=0);
639
    
640
    if(a<0) return -av_rescale(-a, b, c);
641
    
642
    h= a>>32;
643
    if(h==0) return a*b/c;
644
    
645
    l= a&0xFFFFFFFF;
646
    l *= b;
647
    h *= b;
648

    
649
    l += (h%c)<<32;
650

    
651
    return ((h/c)<<32) + l/c;
652
}