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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
        
161
        switch(s->pix_fmt){
162
        case PIX_FMT_YUV422:
163
            pixel_size=2;
164
            break;
165
        case PIX_FMT_RGB24:
166
        case PIX_FMT_BGR24:
167
            pixel_size=3;
168
            break;
169
        case PIX_FMT_RGBA32:
170
            pixel_size=4;
171
            break;
172
        default:
173
            pixel_size=1;
174
        }
175
        
176
        if(s->codec_id==CODEC_ID_SVQ1) align=63;
177
        else                           align=15;
178
    
179
        w= (width +align)&~align;
180
        h= (height+align)&~align;
181
    
182
        if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
183
            w+= EDGE_WIDTH*2;
184
            h+= EDGE_WIDTH*2;
185
        }
186
        
187
        buf->last_pic_num= -256*256*256*64;
188

    
189
        for(i=0; i<3; i++){
190
            const int h_shift= i==0 ? 0 : h_chroma_shift;
191
            const int v_shift= i==0 ? 0 : v_chroma_shift;
192

    
193
            pic->linesize[i]= pixel_size*w>>h_shift;
194

    
195
            buf->base[i]= av_mallocz((pic->linesize[i]*h>>v_shift)+16); //FIXME 16
196
            if(buf->base[i]==NULL) return -1;
197
            memset(buf->base[i], 128, pic->linesize[i]*h>>v_shift);
198
        
199
            if(s->flags&CODEC_FLAG_EMU_EDGE)
200
                buf->data[i] = buf->base[i];
201
            else
202
                buf->data[i] = buf->base[i] + (pic->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift);
203
        }
204
        pic->age= 256*256*256*64;
205
        pic->type= FF_BUFFER_TYPE_INTERNAL;
206
    }
207

    
208
    for(i=0; i<4; i++){
209
        pic->base[i]= buf->base[i];
210
        pic->data[i]= buf->data[i];
211
    }
212
    s->internal_buffer_count++;
213

    
214
    return 0;
215
}
216

    
217
void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
218
    int i;
219
    InternalBuffer *buf, *last, temp;
220

    
221
    assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
222

    
223
    for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
224
        buf= &((InternalBuffer*)s->internal_buffer)[i];
225
        if(buf->data[0] == pic->data[0])
226
            break;
227
    }
228
    assert(i < s->internal_buffer_count);
229
    s->internal_buffer_count--;
230
    last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
231

    
232
    temp= *buf;
233
    *buf= *last;
234
    *last= temp;
235

    
236
    for(i=0; i<3; i++){
237
        pic->data[i]=NULL;
238
//        pic->base[i]=NULL;
239
    }
240
//printf("R%X\n", pic->opaque);
241
}
242

    
243
enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, enum PixelFormat * fmt){
244
    return fmt[0];
245
}
246

    
247
void avcodec_get_context_defaults(AVCodecContext *s){
248
    s->bit_rate= 800*1000;
249
    s->bit_rate_tolerance= s->bit_rate*10;
250
    s->qmin= 2;
251
    s->qmax= 31;
252
    s->mb_qmin= 2;
253
    s->mb_qmax= 31;
254
    s->rc_eq= "tex^qComp";
255
    s->qcompress= 0.5;
256
    s->max_qdiff= 3;
257
    s->b_quant_factor=1.25;
258
    s->b_quant_offset=1.25;
259
    s->i_quant_factor=-0.8;
260
    s->i_quant_offset=0.0;
261
    s->error_concealment= 3;
262
    s->error_resilience= 1;
263
    s->workaround_bugs= FF_BUG_AUTODETECT;
264
    s->frame_rate_base= 1;
265
    s->frame_rate = 25;
266
    s->gop_size= 50;
267
    s->me_method= ME_EPZS;
268
    s->get_buffer= avcodec_default_get_buffer;
269
    s->release_buffer= avcodec_default_release_buffer;
270
    s->get_format= avcodec_default_get_format;
271
    s->me_subpel_quality=8;
272
    
273
    s->intra_quant_bias= FF_DEFAULT_QUANT_BIAS;
274
    s->inter_quant_bias= FF_DEFAULT_QUANT_BIAS;
275
}
276

    
277
/**
278
 * allocates a AVCodecContext and set it to defaults.
279
 * this can be deallocated by simply calling free() 
280
 */
281
AVCodecContext *avcodec_alloc_context(void){
282
    AVCodecContext *avctx= av_mallocz(sizeof(AVCodecContext));
283
    
284
    if(avctx==NULL) return NULL;
285
    
286
    avcodec_get_context_defaults(avctx);
287
    
288
    return avctx;
289
}
290

    
291
/**
292
 * allocates a AVPFrame and set it to defaults.
293
 * this can be deallocated by simply calling free() 
294
 */
295
AVFrame *avcodec_alloc_frame(void){
296
    AVFrame *pic= av_mallocz(sizeof(AVFrame));
297
    
298
    return pic;
299
}
300

    
301
int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
302
{
303
    int ret;
304

    
305
    avctx->codec = codec;
306
    avctx->codec_id = codec->id;
307
    avctx->frame_number = 0;
308
    if (codec->priv_data_size > 0) {
309
        avctx->priv_data = av_mallocz(codec->priv_data_size);
310
        if (!avctx->priv_data) 
311
            return -ENOMEM;
312
    } else {
313
        avctx->priv_data = NULL;
314
    }
315
    ret = avctx->codec->init(avctx);
316
    if (ret < 0) {
317
        av_freep(&avctx->priv_data);
318
        return ret;
319
    }
320
    return 0;
321
}
322

    
323
int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size, 
324
                         const short *samples)
325
{
326
    int ret;
327

    
328
    ret = avctx->codec->encode(avctx, buf, buf_size, (void *)samples);
329
    avctx->frame_number++;
330
    return ret;
331
}
332

    
333
int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size, 
334
                         const AVFrame *pict)
335
{
336
    int ret;
337

    
338
    ret = avctx->codec->encode(avctx, buf, buf_size, (void *)pict);
339
    
340
    emms_c(); //needed to avoid a emms_c() call before every return;
341

    
342
    avctx->frame_number++;
343
    return ret;
344
}
345

    
346
/** 
347
 * decode a frame. 
348
 * @param buf bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE larger then the actual read bytes
349
 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
350
 * @param buf_size the size of the buffer in bytes
351
 * @param got_picture_ptr zero if no frame could be decompressed, Otherwise, it is non zero
352
 * @return -1 if error, otherwise return the number of
353
 * bytes used. 
354
 */
355
int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture, 
356
                         int *got_picture_ptr,
357
                         uint8_t *buf, int buf_size)
358
{
359
    int ret;
360
    
361
    ret = avctx->codec->decode(avctx, picture, got_picture_ptr, 
362
                               buf, buf_size);
363

    
364
    emms_c(); //needed to avoid a emms_c() call before every return;
365
    
366
    if (*got_picture_ptr)                           
367
        avctx->frame_number++;
368
    return ret;
369
}
370

    
371
/* decode an audio frame. return -1 if error, otherwise return the
372
   *number of bytes used. If no frame could be decompressed,
373
   *frame_size_ptr is zero. Otherwise, it is the decompressed frame
374
   *size in BYTES. */
375
int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples, 
376
                         int *frame_size_ptr,
377
                         uint8_t *buf, int buf_size)
378
{
379
    int ret;
380

    
381
    ret = avctx->codec->decode(avctx, samples, frame_size_ptr, 
382
                               buf, buf_size);
383
    avctx->frame_number++;
384
    return ret;
385
}
386

    
387
int avcodec_close(AVCodecContext *avctx)
388
{
389
    if (avctx->codec->close)
390
        avctx->codec->close(avctx);
391
    av_freep(&avctx->priv_data);
392
    avctx->codec = NULL;
393
    return 0;
394
}
395

    
396
AVCodec *avcodec_find_encoder(enum CodecID id)
397
{
398
    AVCodec *p;
399
    p = first_avcodec;
400
    while (p) {
401
        if (p->encode != NULL && p->id == id)
402
            return p;
403
        p = p->next;
404
    }
405
    return NULL;
406
}
407

    
408
AVCodec *avcodec_find_encoder_by_name(const char *name)
409
{
410
    AVCodec *p;
411
    p = first_avcodec;
412
    while (p) {
413
        if (p->encode != NULL && strcmp(name,p->name) == 0)
414
            return p;
415
        p = p->next;
416
    }
417
    return NULL;
418
}
419

    
420
AVCodec *avcodec_find_decoder(enum CodecID id)
421
{
422
    AVCodec *p;
423
    p = first_avcodec;
424
    while (p) {
425
        if (p->decode != NULL && p->id == id)
426
            return p;
427
        p = p->next;
428
    }
429
    return NULL;
430
}
431

    
432
AVCodec *avcodec_find_decoder_by_name(const char *name)
433
{
434
    AVCodec *p;
435
    p = first_avcodec;
436
    while (p) {
437
        if (p->decode != NULL && strcmp(name,p->name) == 0)
438
            return p;
439
        p = p->next;
440
    }
441
    return NULL;
442
}
443

    
444
AVCodec *avcodec_find(enum CodecID id)
445
{
446
    AVCodec *p;
447
    p = first_avcodec;
448
    while (p) {
449
        if (p->id == id)
450
            return p;
451
        p = p->next;
452
    }
453
    return NULL;
454
}
455

    
456
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
457
{
458
    const char *codec_name;
459
    AVCodec *p;
460
    char buf1[32];
461
    char channels_str[100];
462
    int bitrate;
463

    
464
    if (encode)
465
        p = avcodec_find_encoder(enc->codec_id);
466
    else
467
        p = avcodec_find_decoder(enc->codec_id);
468

    
469
    if (p) {
470
        codec_name = p->name;
471
    } else if (enc->codec_name[0] != '\0') {
472
        codec_name = enc->codec_name;
473
    } else {
474
        /* output avi tags */
475
        if (enc->codec_type == CODEC_TYPE_VIDEO) {
476
            snprintf(buf1, sizeof(buf1), "%c%c%c%c", 
477
                     enc->codec_tag & 0xff,
478
                     (enc->codec_tag >> 8) & 0xff,
479
                     (enc->codec_tag >> 16) & 0xff,
480
                     (enc->codec_tag >> 24) & 0xff);
481
        } else {
482
            snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
483
        }
484
        codec_name = buf1;
485
    }
486

    
487
    switch(enc->codec_type) {
488
    case CODEC_TYPE_VIDEO:
489
        snprintf(buf, buf_size,
490
                 "Video: %s%s",
491
                 codec_name, enc->flags & CODEC_FLAG_HQ ? " (hq)" : "");
492
        if (enc->codec_id == CODEC_ID_RAWVIDEO) {
493
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
494
                     ", %s",
495
                     avcodec_get_pix_fmt_name(enc->pix_fmt));
496
        }
497
        if (enc->width) {
498
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
499
                     ", %dx%d, %0.2f fps",
500
                     enc->width, enc->height, 
501
                     (float)enc->frame_rate / enc->frame_rate_base);
502
        }
503
        if (encode) {
504
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
505
                     ", q=%d-%d", enc->qmin, enc->qmax);
506
        }
507
        bitrate = enc->bit_rate;
508
        break;
509
    case CODEC_TYPE_AUDIO:
510
        snprintf(buf, buf_size,
511
                 "Audio: %s",
512
                 codec_name);
513
        switch (enc->channels) {
514
            case 1:
515
                strcpy(channels_str, "mono");
516
                break;
517
            case 2:
518
                strcpy(channels_str, "stereo");
519
                break;
520
            case 6:
521
                strcpy(channels_str, "5:1");
522
                break;
523
            default:
524
                sprintf(channels_str, "%d channels", enc->channels);
525
                break;
526
        }
527
        if (enc->sample_rate) {
528
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
529
                     ", %d Hz, %s",
530
                     enc->sample_rate,
531
                     channels_str);
532
        }
533
        
534
        /* for PCM codecs, compute bitrate directly */
535
        switch(enc->codec_id) {
536
        case CODEC_ID_PCM_S16LE:
537
        case CODEC_ID_PCM_S16BE:
538
        case CODEC_ID_PCM_U16LE:
539
        case CODEC_ID_PCM_U16BE:
540
            bitrate = enc->sample_rate * enc->channels * 16;
541
            break;
542
        case CODEC_ID_PCM_S8:
543
        case CODEC_ID_PCM_U8:
544
        case CODEC_ID_PCM_ALAW:
545
        case CODEC_ID_PCM_MULAW:
546
            bitrate = enc->sample_rate * enc->channels * 8;
547
            break;
548
        default:
549
            bitrate = enc->bit_rate;
550
            break;
551
        }
552
        break;
553
    default:
554
        av_abort();
555
    }
556
    if (encode) {
557
        if (enc->flags & CODEC_FLAG_PASS1)
558
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
559
                     ", pass 1");
560
        if (enc->flags & CODEC_FLAG_PASS2)
561
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
562
                     ", pass 2");
563
    }
564
    if (bitrate != 0) {
565
        snprintf(buf + strlen(buf), buf_size - strlen(buf), 
566
                 ", %d kb/s", bitrate / 1000);
567
    }
568
}
569

    
570
unsigned avcodec_version( void )
571
{
572
  return LIBAVCODEC_VERSION_INT;
573
}
574

    
575
unsigned avcodec_build( void )
576
{
577
  return LIBAVCODEC_BUILD;
578
}
579

    
580
/* must be called before any other functions */
581
void avcodec_init(void)
582
{
583
    static int inited = 0;
584

    
585
    if (inited != 0)
586
        return;
587
    inited = 1;
588

    
589
    dsputil_static_init();
590
}
591

    
592
/* this can be called after seeking and before trying to decode the next keyframe */
593
void avcodec_flush_buffers(AVCodecContext *avctx)
594
{
595
    int i;
596
    MpegEncContext *s = avctx->priv_data;
597
    
598
    switch(avctx->codec_id){
599
    case CODEC_ID_MPEG1VIDEO:
600
    case CODEC_ID_H263:
601
    case CODEC_ID_RV10:
602
//    case CODEC_ID_MJPEG:
603
//    case CODEC_ID_MJPEGB:
604
    case CODEC_ID_MPEG4:
605
    case CODEC_ID_MSMPEG4V1:
606
    case CODEC_ID_MSMPEG4V2:
607
    case CODEC_ID_MSMPEG4V3:
608
    case CODEC_ID_WMV1:
609
    case CODEC_ID_WMV2:
610
    case CODEC_ID_H263P:
611
    case CODEC_ID_H263I:
612
    case CODEC_ID_SVQ1:
613
        for(i=0; i<MAX_PICTURE_COUNT; i++){
614
           if(s->picture[i].data[0] && (   s->picture[i].type == FF_BUFFER_TYPE_INTERNAL
615
                                        || s->picture[i].type == FF_BUFFER_TYPE_USER))
616
            avctx->release_buffer(avctx, (AVFrame*)&s->picture[i]);
617
        }
618
        s->last_picture_ptr = s->next_picture_ptr = NULL;
619
        break;
620
    default:
621
        //FIXME
622
        break;
623
    }
624
}
625

    
626
void avcodec_default_free_buffers(AVCodecContext *s){
627
    int i, j;
628

    
629
    if(s->internal_buffer==NULL) return;
630
    
631
    for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
632
        InternalBuffer *buf= &((InternalBuffer*)s->internal_buffer)[i];
633
        for(j=0; j<4; j++){
634
            av_freep(&buf->base[j]);
635
            buf->data[j]= NULL;
636
        }
637
    }
638
    av_freep(&s->internal_buffer);
639
    
640
    s->internal_buffer_count=0;
641
}
642

    
643
char av_get_pict_type_char(int pict_type){
644
    switch(pict_type){
645
    case I_TYPE: return 'I'; 
646
    case P_TYPE: return 'P'; 
647
    case B_TYPE: return 'B'; 
648
    case S_TYPE: return 'S'; 
649
    case SI_TYPE:return 'i'; 
650
    case SP_TYPE:return 'p'; 
651
    default:     return '?';
652
    }
653
}
654

    
655
int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
656
    int exact=1, sign=0;
657
    int64_t gcd, larger;
658

    
659
    assert(den != 0);
660

    
661
    if(den < 0){
662
        den= -den;
663
        nom= -nom;
664
    }
665
    
666
    if(nom < 0){
667
        nom= -nom;
668
        sign= 1;
669
    }
670
    
671
    for(;;){ //note is executed 1 or 2 times 
672
        gcd = ff_gcd(nom, den);
673
        nom /= gcd;
674
        den /= gcd;
675
    
676
        larger= FFMAX(nom, den);
677
    
678
        if(larger > max){
679
            int64_t div= (larger + max - 1) / max;
680
            nom =  (nom + div/2)/div;
681
            den =  (den + div/2)/div;
682
            exact=0;
683
        }else 
684
            break;
685
    }
686
    
687
    if(sign) nom= -nom;
688
    
689
    *dst_nom = nom;
690
    *dst_den = den;
691
    
692
    return exact;
693
}
694

    
695
int64_t av_rescale(int64_t a, int b, int c){
696
    uint64_t h, l;
697
    assert(c > 0);
698
    assert(b >=0);
699
    
700
    if(a<0) return -av_rescale(-a, b, c);
701
    
702
    h= a>>32;
703
    if(h==0) return a*b/c;
704
    
705
    l= a&0xFFFFFFFF;
706
    l *= b;
707
    h *= b;
708

    
709
    l += (h%c)<<32;
710

    
711
    return ((h/c)<<32) + l/c;
712
}