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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(void)
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 InternalBuffer{
123
    int last_pic_num;
124
    uint8_t *base[4];
125
    uint8_t *data[4];
126
}InternalBuffer;
127

    
128
#define INTERNAL_BUFFER_SIZE 32
129

    
130
int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
131
    int i;
132
    const int width = s->width;
133
    const int height= s->height;
134
    InternalBuffer *buf;
135
    
136
    assert(pic->data[0]==NULL);
137
    assert(INTERNAL_BUFFER_SIZE > s->internal_buffer_count);
138

    
139
    if(s->internal_buffer==NULL){
140
        s->internal_buffer= av_mallocz(INTERNAL_BUFFER_SIZE*sizeof(InternalBuffer));
141
    }
142
#if 0
143
    s->internal_buffer= av_fast_realloc(
144
        s->internal_buffer, 
145
        &s->internal_buffer_size, 
146
        sizeof(InternalBuffer)*FFMAX(99,  s->internal_buffer_count+1)/*FIXME*/
147
        );
148
#endif
149
     
150
    buf= &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
151

    
152
    if(buf->base[0]){
153
        pic->age= pic->coded_picture_number - buf->last_pic_num;
154
        buf->last_pic_num= pic->coded_picture_number;
155
    }else{
156
        int align, h_chroma_shift, v_chroma_shift;
157
        int w, h, pixel_size;
158
        
159
        avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
160
        switch(s->pix_fmt){
161
        case PIX_FMT_RGB555:
162
        case PIX_FMT_RGB565:
163
        case PIX_FMT_YUV422:
164
            pixel_size=2;
165
            break;
166
        case PIX_FMT_RGB24:
167
        case PIX_FMT_BGR24:
168
            pixel_size=3;
169
            break;
170
        case PIX_FMT_RGBA32:
171
            pixel_size=4;
172
            break;
173
        default:
174
            pixel_size=1;
175
        }
176
        
177
        if(s->codec_id==CODEC_ID_SVQ1) align=63;
178
        else                           align=15;
179
    
180
        w= (width +align)&~align;
181
        h= (height+align)&~align;
182
    
183
        if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
184
            w+= EDGE_WIDTH*2;
185
            h+= EDGE_WIDTH*2;
186
        }
187
        
188
        buf->last_pic_num= -256*256*256*64;
189

    
190
        for(i=0; i<3; i++){
191
            const int h_shift= i==0 ? 0 : h_chroma_shift;
192
            const int v_shift= i==0 ? 0 : v_chroma_shift;
193

    
194
            pic->linesize[i]= pixel_size*w>>h_shift;
195

    
196
            buf->base[i]= av_mallocz((pic->linesize[i]*h>>v_shift)+16); //FIXME 16
197
            if(buf->base[i]==NULL) return -1;
198
            memset(buf->base[i], 128, pic->linesize[i]*h>>v_shift);
199
        
200
            if(s->flags&CODEC_FLAG_EMU_EDGE)
201
                buf->data[i] = buf->base[i];
202
            else
203
                buf->data[i] = buf->base[i] + (pic->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift);
204
        }
205
        pic->age= 256*256*256*64;
206
        pic->type= FF_BUFFER_TYPE_INTERNAL;
207
    }
208

    
209
    for(i=0; i<4; i++){
210
        pic->base[i]= buf->base[i];
211
        pic->data[i]= buf->data[i];
212
    }
213
    s->internal_buffer_count++;
214

    
215
    return 0;
216
}
217

    
218
void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
219
    int i;
220
    InternalBuffer *buf, *last, temp;
221

    
222
    assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
223
    assert(s->internal_buffer_count);
224

    
225
    for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
226
        buf= &((InternalBuffer*)s->internal_buffer)[i];
227
        if(buf->data[0] == pic->data[0])
228
            break;
229
    }
230
    assert(i < s->internal_buffer_count);
231
    s->internal_buffer_count--;
232
    last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
233

    
234
    temp= *buf;
235
    *buf= *last;
236
    *last= temp;
237

    
238
    for(i=0; i<3; i++){
239
        pic->data[i]=NULL;
240
//        pic->base[i]=NULL;
241
    }
242
//printf("R%X\n", pic->opaque);
243
}
244

    
245
enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, enum PixelFormat * fmt){
246
    return fmt[0];
247
}
248

    
249
void avcodec_get_context_defaults(AVCodecContext *s){
250
    s->bit_rate= 800*1000;
251
    s->bit_rate_tolerance= s->bit_rate*10;
252
    s->qmin= 2;
253
    s->qmax= 31;
254
    s->mb_qmin= 2;
255
    s->mb_qmax= 31;
256
    s->rc_eq= "tex^qComp";
257
    s->qcompress= 0.5;
258
    s->max_qdiff= 3;
259
    s->b_quant_factor=1.25;
260
    s->b_quant_offset=1.25;
261
    s->i_quant_factor=-0.8;
262
    s->i_quant_offset=0.0;
263
    s->error_concealment= 3;
264
    s->error_resilience= 1;
265
    s->workaround_bugs= FF_BUG_AUTODETECT;
266
    s->frame_rate_base= 1;
267
    s->frame_rate = 25;
268
    s->gop_size= 50;
269
    s->me_method= ME_EPZS;
270
    s->get_buffer= avcodec_default_get_buffer;
271
    s->release_buffer= avcodec_default_release_buffer;
272
    s->get_format= avcodec_default_get_format;
273
    s->me_subpel_quality=8;
274
    
275
    s->intra_quant_bias= FF_DEFAULT_QUANT_BIAS;
276
    s->inter_quant_bias= FF_DEFAULT_QUANT_BIAS;
277
}
278

    
279
/**
280
 * allocates a AVCodecContext and set it to defaults.
281
 * this can be deallocated by simply calling free() 
282
 */
283
AVCodecContext *avcodec_alloc_context(void){
284
    AVCodecContext *avctx= av_mallocz(sizeof(AVCodecContext));
285
    
286
    if(avctx==NULL) return NULL;
287
    
288
    avcodec_get_context_defaults(avctx);
289
    
290
    return avctx;
291
}
292

    
293
/**
294
 * allocates a AVPFrame and set it to defaults.
295
 * this can be deallocated by simply calling free() 
296
 */
297
AVFrame *avcodec_alloc_frame(void){
298
    AVFrame *pic= av_mallocz(sizeof(AVFrame));
299
    
300
    return pic;
301
}
302

    
303
int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
304
{
305
    int ret;
306

    
307
    avctx->codec = codec;
308
    avctx->codec_id = codec->id;
309
    avctx->frame_number = 0;
310
    if (codec->priv_data_size > 0) {
311
        avctx->priv_data = av_mallocz(codec->priv_data_size);
312
        if (!avctx->priv_data) 
313
            return -ENOMEM;
314
    } else {
315
        avctx->priv_data = NULL;
316
    }
317
    ret = avctx->codec->init(avctx);
318
    if (ret < 0) {
319
        av_freep(&avctx->priv_data);
320
        return ret;
321
    }
322
    return 0;
323
}
324

    
325
int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size, 
326
                         const short *samples)
327
{
328
    int ret;
329

    
330
    ret = avctx->codec->encode(avctx, buf, buf_size, (void *)samples);
331
    avctx->frame_number++;
332
    return ret;
333
}
334

    
335
int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size, 
336
                         const AVFrame *pict)
337
{
338
    int ret;
339

    
340
    ret = avctx->codec->encode(avctx, buf, buf_size, (void *)pict);
341
    
342
    emms_c(); //needed to avoid a emms_c() call before every return;
343

    
344
    avctx->frame_number++;
345
    return ret;
346
}
347

    
348
/** 
349
 * decode a frame. 
350
 * @param buf bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE larger then the actual read bytes
351
 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
352
 * @param buf_size the size of the buffer in bytes
353
 * @param got_picture_ptr zero if no frame could be decompressed, Otherwise, it is non zero
354
 * @return -1 if error, otherwise return the number of
355
 * bytes used. 
356
 */
357
int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture, 
358
                         int *got_picture_ptr,
359
                         uint8_t *buf, int buf_size)
360
{
361
    int ret;
362
    
363
    ret = avctx->codec->decode(avctx, picture, got_picture_ptr, 
364
                               buf, buf_size);
365

    
366
    emms_c(); //needed to avoid a emms_c() call before every return;
367
    
368
    if (*got_picture_ptr)                           
369
        avctx->frame_number++;
370
    return ret;
371
}
372

    
373
/* decode an audio frame. return -1 if error, otherwise return the
374
   *number of bytes used. If no frame could be decompressed,
375
   *frame_size_ptr is zero. Otherwise, it is the decompressed frame
376
   *size in BYTES. */
377
int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples, 
378
                         int *frame_size_ptr,
379
                         uint8_t *buf, int buf_size)
380
{
381
    int ret;
382

    
383
    ret = avctx->codec->decode(avctx, samples, frame_size_ptr, 
384
                               buf, buf_size);
385
    avctx->frame_number++;
386
    return ret;
387
}
388

    
389
int avcodec_close(AVCodecContext *avctx)
390
{
391
    if (avctx->codec->close)
392
        avctx->codec->close(avctx);
393
    av_freep(&avctx->priv_data);
394
    avctx->codec = NULL;
395
    return 0;
396
}
397

    
398
AVCodec *avcodec_find_encoder(enum CodecID id)
399
{
400
    AVCodec *p;
401
    p = first_avcodec;
402
    while (p) {
403
        if (p->encode != NULL && p->id == id)
404
            return p;
405
        p = p->next;
406
    }
407
    return NULL;
408
}
409

    
410
AVCodec *avcodec_find_encoder_by_name(const char *name)
411
{
412
    AVCodec *p;
413
    p = first_avcodec;
414
    while (p) {
415
        if (p->encode != NULL && strcmp(name,p->name) == 0)
416
            return p;
417
        p = p->next;
418
    }
419
    return NULL;
420
}
421

    
422
AVCodec *avcodec_find_decoder(enum CodecID id)
423
{
424
    AVCodec *p;
425
    p = first_avcodec;
426
    while (p) {
427
        if (p->decode != NULL && p->id == id)
428
            return p;
429
        p = p->next;
430
    }
431
    return NULL;
432
}
433

    
434
AVCodec *avcodec_find_decoder_by_name(const char *name)
435
{
436
    AVCodec *p;
437
    p = first_avcodec;
438
    while (p) {
439
        if (p->decode != NULL && strcmp(name,p->name) == 0)
440
            return p;
441
        p = p->next;
442
    }
443
    return NULL;
444
}
445

    
446
AVCodec *avcodec_find(enum CodecID id)
447
{
448
    AVCodec *p;
449
    p = first_avcodec;
450
    while (p) {
451
        if (p->id == id)
452
            return p;
453
        p = p->next;
454
    }
455
    return NULL;
456
}
457

    
458
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
459
{
460
    const char *codec_name;
461
    AVCodec *p;
462
    char buf1[32];
463
    char channels_str[100];
464
    int bitrate;
465

    
466
    if (encode)
467
        p = avcodec_find_encoder(enc->codec_id);
468
    else
469
        p = avcodec_find_decoder(enc->codec_id);
470

    
471
    if (p) {
472
        codec_name = p->name;
473
    } else if (enc->codec_name[0] != '\0') {
474
        codec_name = enc->codec_name;
475
    } else {
476
        /* output avi tags */
477
        if (enc->codec_type == CODEC_TYPE_VIDEO) {
478
            snprintf(buf1, sizeof(buf1), "%c%c%c%c", 
479
                     enc->codec_tag & 0xff,
480
                     (enc->codec_tag >> 8) & 0xff,
481
                     (enc->codec_tag >> 16) & 0xff,
482
                     (enc->codec_tag >> 24) & 0xff);
483
        } else {
484
            snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
485
        }
486
        codec_name = buf1;
487
    }
488

    
489
    switch(enc->codec_type) {
490
    case CODEC_TYPE_VIDEO:
491
        snprintf(buf, buf_size,
492
                 "Video: %s%s",
493
                 codec_name, enc->mb_decision ? " (hq)" : "");
494
        if (enc->codec_id == CODEC_ID_RAWVIDEO) {
495
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
496
                     ", %s",
497
                     avcodec_get_pix_fmt_name(enc->pix_fmt));
498
        }
499
        if (enc->width) {
500
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
501
                     ", %dx%d, %0.2f fps",
502
                     enc->width, enc->height, 
503
                     (float)enc->frame_rate / enc->frame_rate_base);
504
        }
505
        if (encode) {
506
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
507
                     ", q=%d-%d", enc->qmin, enc->qmax);
508
        }
509
        bitrate = enc->bit_rate;
510
        break;
511
    case CODEC_TYPE_AUDIO:
512
        snprintf(buf, buf_size,
513
                 "Audio: %s",
514
                 codec_name);
515
        switch (enc->channels) {
516
            case 1:
517
                strcpy(channels_str, "mono");
518
                break;
519
            case 2:
520
                strcpy(channels_str, "stereo");
521
                break;
522
            case 6:
523
                strcpy(channels_str, "5:1");
524
                break;
525
            default:
526
                sprintf(channels_str, "%d channels", enc->channels);
527
                break;
528
        }
529
        if (enc->sample_rate) {
530
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
531
                     ", %d Hz, %s",
532
                     enc->sample_rate,
533
                     channels_str);
534
        }
535
        
536
        /* for PCM codecs, compute bitrate directly */
537
        switch(enc->codec_id) {
538
        case CODEC_ID_PCM_S16LE:
539
        case CODEC_ID_PCM_S16BE:
540
        case CODEC_ID_PCM_U16LE:
541
        case CODEC_ID_PCM_U16BE:
542
            bitrate = enc->sample_rate * enc->channels * 16;
543
            break;
544
        case CODEC_ID_PCM_S8:
545
        case CODEC_ID_PCM_U8:
546
        case CODEC_ID_PCM_ALAW:
547
        case CODEC_ID_PCM_MULAW:
548
            bitrate = enc->sample_rate * enc->channels * 8;
549
            break;
550
        default:
551
            bitrate = enc->bit_rate;
552
            break;
553
        }
554
        break;
555
    default:
556
        av_abort();
557
    }
558
    if (encode) {
559
        if (enc->flags & CODEC_FLAG_PASS1)
560
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
561
                     ", pass 1");
562
        if (enc->flags & CODEC_FLAG_PASS2)
563
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
564
                     ", pass 2");
565
    }
566
    if (bitrate != 0) {
567
        snprintf(buf + strlen(buf), buf_size - strlen(buf), 
568
                 ", %d kb/s", bitrate / 1000);
569
    }
570
}
571

    
572
unsigned avcodec_version( void )
573
{
574
  return LIBAVCODEC_VERSION_INT;
575
}
576

    
577
unsigned avcodec_build( void )
578
{
579
  return LIBAVCODEC_BUILD;
580
}
581

    
582
/* must be called before any other functions */
583
void avcodec_init(void)
584
{
585
    static int inited = 0;
586

    
587
    if (inited != 0)
588
        return;
589
    inited = 1;
590

    
591
    dsputil_static_init();
592
}
593

    
594
/**
595
 * Flush buffers, should be called when seeking or when swicthing to a different stream.
596
 */
597
void avcodec_flush_buffers(AVCodecContext *avctx)
598
{
599
    if(avctx->codec->flush)
600
        avctx->codec->flush(avctx);
601
}
602

    
603
void avcodec_default_free_buffers(AVCodecContext *s){
604
    int i, j;
605

    
606
    if(s->internal_buffer==NULL) return;
607
    
608
    for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
609
        InternalBuffer *buf= &((InternalBuffer*)s->internal_buffer)[i];
610
        for(j=0; j<4; j++){
611
            av_freep(&buf->base[j]);
612
            buf->data[j]= NULL;
613
        }
614
    }
615
    av_freep(&s->internal_buffer);
616
    
617
    s->internal_buffer_count=0;
618
}
619

    
620
char av_get_pict_type_char(int pict_type){
621
    switch(pict_type){
622
    case I_TYPE: return 'I'; 
623
    case P_TYPE: return 'P'; 
624
    case B_TYPE: return 'B'; 
625
    case S_TYPE: return 'S'; 
626
    case SI_TYPE:return 'i'; 
627
    case SP_TYPE:return 'p'; 
628
    default:     return '?';
629
    }
630
}
631

    
632
int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
633
    int exact=1, sign=0;
634
    int64_t gcd, larger;
635

    
636
    assert(den != 0);
637

    
638
    if(den < 0){
639
        den= -den;
640
        nom= -nom;
641
    }
642
    
643
    if(nom < 0){
644
        nom= -nom;
645
        sign= 1;
646
    }
647
    
648
    for(;;){ //note is executed 1 or 2 times 
649
        gcd = ff_gcd(nom, den);
650
        nom /= gcd;
651
        den /= gcd;
652
    
653
        larger= FFMAX(nom, den);
654
    
655
        if(larger > max){
656
            int64_t div= (larger + max - 1) / max;
657
            nom =  (nom + div/2)/div;
658
            den =  (den + div/2)/div;
659
            exact=0;
660
        }else 
661
            break;
662
    }
663
    
664
    if(sign) nom= -nom;
665
    
666
    *dst_nom = nom;
667
    *dst_den = den;
668
    
669
    return exact;
670
}
671

    
672
int64_t av_rescale(int64_t a, int b, int c){
673
    uint64_t h, l;
674
    assert(c > 0);
675
    assert(b >=0);
676
    
677
    if(a<0) return -av_rescale(-a, b, c);
678
    
679
    h= a>>32;
680
    if(h==0) return a*b/c;
681
    
682
    l= a&0xFFFFFFFF;
683
    l *= b;
684
    h *= b;
685

    
686
    l += (h%c)<<32;
687

    
688
    return ((h/c)<<32) + l/c;
689
}