Statistics
| Branch: | Revision:

ffmpeg / libavcodec / utils.c @ 46b4feec

History | View | Annotate | Download (16.3 KB)

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_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
            int h_shift= i==0 ? 0 : h_chroma_shift;
185
            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

    
249
/**
250
 * allocates a AVCodecContext and set it to defaults.
251
 * this can be deallocated by simply calling free() 
252
 */
253
AVCodecContext *avcodec_alloc_context(void){
254
    AVCodecContext *avctx= av_mallocz(sizeof(AVCodecContext));
255
    
256
    if(avctx==NULL) return NULL;
257
    
258
    avcodec_get_context_defaults(avctx);
259
    
260
    return avctx;
261
}
262

    
263
/**
264
 * allocates a AVPFrame and set it to defaults.
265
 * this can be deallocated by simply calling free() 
266
 */
267
AVFrame *avcodec_alloc_frame(void){
268
    AVFrame *pic= av_mallocz(sizeof(AVFrame));
269
    
270
    return pic;
271
}
272

    
273
int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
274
{
275
    int ret;
276

    
277
    avctx->codec = codec;
278
    avctx->codec_id = codec->id;
279
    avctx->frame_number = 0;
280
    if (codec->priv_data_size > 0) {
281
        avctx->priv_data = av_mallocz(codec->priv_data_size);
282
        if (!avctx->priv_data) 
283
            return -ENOMEM;
284
    } else {
285
        avctx->priv_data = NULL;
286
    }
287
    ret = avctx->codec->init(avctx);
288
    if (ret < 0) {
289
        av_freep(&avctx->priv_data);
290
        return ret;
291
    }
292
    return 0;
293
}
294

    
295
int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size, 
296
                         const short *samples)
297
{
298
    int ret;
299

    
300
    ret = avctx->codec->encode(avctx, buf, buf_size, (void *)samples);
301
    avctx->frame_number++;
302
    return ret;
303
}
304

    
305
int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size, 
306
                         const AVFrame *pict)
307
{
308
    int ret;
309

    
310
    ret = avctx->codec->encode(avctx, buf, buf_size, (void *)pict);
311
    
312
    emms_c(); //needed to avoid a emms_c() call before every return;
313

    
314
    avctx->frame_number++;
315
    return ret;
316
}
317

    
318
/* decode a frame. return -1 if error, otherwise return the number of
319
   bytes used. If no frame could be decompressed, *got_picture_ptr is
320
   zero. Otherwise, it is non zero */
321
int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture, 
322
                         int *got_picture_ptr,
323
                         uint8_t *buf, int buf_size)
324
{
325
    int ret;
326
    
327
    ret = avctx->codec->decode(avctx, picture, got_picture_ptr, 
328
                               buf, buf_size);
329

    
330
    emms_c(); //needed to avoid a emms_c() call before every return;
331
    
332
    if (*got_picture_ptr)                           
333
        avctx->frame_number++;
334
    return ret;
335
}
336

    
337
/* decode an audio frame. return -1 if error, otherwise return the
338
   *number of bytes used. If no frame could be decompressed,
339
   *frame_size_ptr is zero. Otherwise, it is the decompressed frame
340
   *size in BYTES. */
341
int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples, 
342
                         int *frame_size_ptr,
343
                         uint8_t *buf, int buf_size)
344
{
345
    int ret;
346

    
347
    ret = avctx->codec->decode(avctx, samples, frame_size_ptr, 
348
                               buf, buf_size);
349
    avctx->frame_number++;
350
    return ret;
351
}
352

    
353
int avcodec_close(AVCodecContext *avctx)
354
{
355
    if (avctx->codec->close)
356
        avctx->codec->close(avctx);
357
    av_freep(&avctx->priv_data);
358
    avctx->codec = NULL;
359
    return 0;
360
}
361

    
362
AVCodec *avcodec_find_encoder(enum CodecID id)
363
{
364
    AVCodec *p;
365
    p = first_avcodec;
366
    while (p) {
367
        if (p->encode != NULL && p->id == id)
368
            return p;
369
        p = p->next;
370
    }
371
    return NULL;
372
}
373

    
374
AVCodec *avcodec_find_encoder_by_name(const char *name)
375
{
376
    AVCodec *p;
377
    p = first_avcodec;
378
    while (p) {
379
        if (p->encode != NULL && strcmp(name,p->name) == 0)
380
            return p;
381
        p = p->next;
382
    }
383
    return NULL;
384
}
385

    
386
AVCodec *avcodec_find_decoder(enum CodecID id)
387
{
388
    AVCodec *p;
389
    p = first_avcodec;
390
    while (p) {
391
        if (p->decode != NULL && p->id == id)
392
            return p;
393
        p = p->next;
394
    }
395
    return NULL;
396
}
397

    
398
AVCodec *avcodec_find_decoder_by_name(const char *name)
399
{
400
    AVCodec *p;
401
    p = first_avcodec;
402
    while (p) {
403
        if (p->decode != NULL && strcmp(name,p->name) == 0)
404
            return p;
405
        p = p->next;
406
    }
407
    return NULL;
408
}
409

    
410
AVCodec *avcodec_find(enum CodecID id)
411
{
412
    AVCodec *p;
413
    p = first_avcodec;
414
    while (p) {
415
        if (p->id == id)
416
            return p;
417
        p = p->next;
418
    }
419
    return NULL;
420
}
421

    
422
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
423
{
424
    const char *codec_name;
425
    AVCodec *p;
426
    char buf1[32];
427
    char channels_str[100];
428
    int bitrate;
429

    
430
    if (encode)
431
        p = avcodec_find_encoder(enc->codec_id);
432
    else
433
        p = avcodec_find_decoder(enc->codec_id);
434

    
435
    if (p) {
436
        codec_name = p->name;
437
    } else if (enc->codec_name[0] != '\0') {
438
        codec_name = enc->codec_name;
439
    } else {
440
        /* output avi tags */
441
        if (enc->codec_type == CODEC_TYPE_VIDEO) {
442
            snprintf(buf1, sizeof(buf1), "%c%c%c%c", 
443
                     enc->codec_tag & 0xff,
444
                     (enc->codec_tag >> 8) & 0xff,
445
                     (enc->codec_tag >> 16) & 0xff,
446
                     (enc->codec_tag >> 24) & 0xff);
447
        } else {
448
            snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
449
        }
450
        codec_name = buf1;
451
    }
452

    
453
    switch(enc->codec_type) {
454
    case CODEC_TYPE_VIDEO:
455
        snprintf(buf, buf_size,
456
                 "Video: %s%s",
457
                 codec_name, enc->flags & CODEC_FLAG_HQ ? " (hq)" : "");
458
        if (enc->codec_id == CODEC_ID_RAWVIDEO) {
459
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
460
                     ", %s",
461
                     avcodec_get_pix_fmt_name(enc->pix_fmt));
462
        }
463
        if (enc->width) {
464
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
465
                     ", %dx%d, %0.2f fps",
466
                     enc->width, enc->height, 
467
                     (float)enc->frame_rate / enc->frame_rate_base);
468
        }
469
        if (encode) {
470
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
471
                     ", q=%d-%d", enc->qmin, enc->qmax);
472
        }
473
        bitrate = enc->bit_rate;
474
        break;
475
    case CODEC_TYPE_AUDIO:
476
        snprintf(buf, buf_size,
477
                 "Audio: %s",
478
                 codec_name);
479
        switch (enc->channels) {
480
            case 1:
481
                strcpy(channels_str, "mono");
482
                break;
483
            case 2:
484
                strcpy(channels_str, "stereo");
485
                break;
486
            case 6:
487
                strcpy(channels_str, "5:1");
488
                break;
489
            default:
490
                sprintf(channels_str, "%d channels", enc->channels);
491
                break;
492
        }
493
        if (enc->sample_rate) {
494
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
495
                     ", %d Hz, %s",
496
                     enc->sample_rate,
497
                     channels_str);
498
        }
499
        
500
        /* for PCM codecs, compute bitrate directly */
501
        switch(enc->codec_id) {
502
        case CODEC_ID_PCM_S16LE:
503
        case CODEC_ID_PCM_S16BE:
504
        case CODEC_ID_PCM_U16LE:
505
        case CODEC_ID_PCM_U16BE:
506
            bitrate = enc->sample_rate * enc->channels * 16;
507
            break;
508
        case CODEC_ID_PCM_S8:
509
        case CODEC_ID_PCM_U8:
510
        case CODEC_ID_PCM_ALAW:
511
        case CODEC_ID_PCM_MULAW:
512
            bitrate = enc->sample_rate * enc->channels * 8;
513
            break;
514
        default:
515
            bitrate = enc->bit_rate;
516
            break;
517
        }
518
        break;
519
    default:
520
        av_abort();
521
    }
522
    if (encode) {
523
        if (enc->flags & CODEC_FLAG_PASS1)
524
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
525
                     ", pass 1");
526
        if (enc->flags & CODEC_FLAG_PASS2)
527
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
528
                     ", pass 2");
529
    }
530
    if (bitrate != 0) {
531
        snprintf(buf + strlen(buf), buf_size - strlen(buf), 
532
                 ", %d kb/s", bitrate / 1000);
533
    }
534
}
535

    
536
unsigned avcodec_version( void )
537
{
538
  return LIBAVCODEC_VERSION_INT;
539
}
540

    
541
unsigned avcodec_build( void )
542
{
543
  return LIBAVCODEC_BUILD;
544
}
545

    
546
/* must be called before any other functions */
547
void avcodec_init(void)
548
{
549
    static int inited = 0;
550

    
551
    if (inited != 0)
552
        return;
553
    inited = 1;
554

    
555
    //dsputil_init();
556
}
557

    
558
/* this can be called after seeking and before trying to decode the next keyframe */
559
void avcodec_flush_buffers(AVCodecContext *avctx)
560
{
561
    int i;
562
    MpegEncContext *s = avctx->priv_data;
563
    
564
    switch(avctx->codec_id){
565
    case CODEC_ID_MPEG1VIDEO:
566
    case CODEC_ID_H263:
567
    case CODEC_ID_RV10:
568
    case CODEC_ID_MJPEG:
569
    case CODEC_ID_MJPEGB:
570
    case CODEC_ID_MPEG4:
571
    case CODEC_ID_MSMPEG4V1:
572
    case CODEC_ID_MSMPEG4V2:
573
    case CODEC_ID_MSMPEG4V3:
574
    case CODEC_ID_WMV1:
575
    case CODEC_ID_WMV2:
576
    case CODEC_ID_H263P:
577
    case CODEC_ID_H263I:
578
    case CODEC_ID_SVQ1:
579
        for(i=0; i<MAX_PICTURE_COUNT; i++){
580
           if(s->picture[i].data[0] && (   s->picture[i].type == FF_BUFFER_TYPE_INTERNAL
581
                                        || s->picture[i].type == FF_BUFFER_TYPE_USER))
582
            avctx->release_buffer(avctx, (AVFrame*)&s->picture[i]);
583
        }
584
        s->last_picture_ptr = s->next_picture_ptr = NULL;
585
        break;
586
    default:
587
        //FIXME
588
        break;
589
    }
590
}
591

    
592
int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
593
    int exact=1, sign=0;
594
    int64_t gcd, larger;
595

    
596
    assert(den != 0);
597

    
598
    if(den < 0){
599
        den= -den;
600
        nom= -nom;
601
    }
602
    
603
    if(nom < 0){
604
        nom= -nom;
605
        sign= 1;
606
    }
607
    
608
    for(;;){ //note is executed 1 or 2 times 
609
        gcd = ff_gcd(nom, den);
610
        nom /= gcd;
611
        den /= gcd;
612
    
613
        larger= FFMAX(nom, den);
614
    
615
        if(larger > max){
616
            int64_t div= (larger + max - 1) / max;
617
            nom =  (nom + div/2)/div;
618
            den =  (den + div/2)/div;
619
            exact=0;
620
        }else 
621
            break;
622
    }
623
    
624
    if(sign) nom= -nom;
625
    
626
    *dst_nom = nom;
627
    *dst_den = den;
628
    
629
    return exact;
630
}
631

    
632
int64_t av_rescale(int64_t a, int b, int c){
633
    uint64_t h, l;
634
    assert(c > 0);
635
    assert(b >=0);
636
    
637
    if(a<0) return -av_rescale(-a, b, c);
638
    
639
    h= a>>32;
640
    if(h==0) return a*b/c;
641
    
642
    l= a&0xFFFFFFFF;
643
    l *= b;
644
    h *= b;
645

    
646
    l += (h%c)<<32;
647

    
648
    return ((h/c)<<32) + l/c;
649
}