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1
/*
2
 * utils for libavcodec
3
 * Copyright (c) 2001 Fabrice Bellard.
4
 * Copyright (c) 2003 Michel Bardiaux for the av_log API
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 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
6
 *
7
 * This library is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2 of the License, or (at your option) any later version.
11
 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * 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 this library; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20
 */
21
 
22
/**
23
 * @file utils.c
24
 * utils.
25
 */
26
 
27
#include "avcodec.h"
28
#include "dsputil.h"
29
#include "mpegvideo.h"
30
#include <stdarg.h>
31

    
32
static void avcodec_default_free_buffers(AVCodecContext *s);
33

    
34
void *av_mallocz(unsigned int size)
35
{
36
    void *ptr;
37
    
38
    ptr = av_malloc(size);
39
    if (!ptr)
40
        return NULL;
41
    memset(ptr, 0, size);
42
    return ptr;
43
}
44

    
45
char *av_strdup(const char *s)
46
{
47
    char *ptr;
48
    int len;
49
    len = strlen(s) + 1;
50
    ptr = av_malloc(len);
51
    if (!ptr)
52
        return NULL;
53
    memcpy(ptr, s, len);
54
    return ptr;
55
}
56

    
57
/**
58
 * realloc which does nothing if the block is large enough
59
 */
60
void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size)
61
{
62
    if(min_size < *size) 
63
        return ptr;
64
    
65
    *size= 17*min_size/16 + 32;
66

    
67
    return av_realloc(ptr, *size);
68
}
69

    
70

    
71
static unsigned int last_static = 0;
72
static unsigned int allocated_static = 0;
73
static void** array_static = NULL;
74

    
75
/**
76
 * allocation of static arrays - do not use for normal allocation.
77
 */
78
void *av_mallocz_static(unsigned int size)
79
{
80
    void *ptr = av_mallocz(size);
81

    
82
    if(ptr){ 
83
        array_static =av_fast_realloc(array_static, &allocated_static, sizeof(void*)*(last_static+1));
84
        array_static[last_static++] = ptr;
85
    }
86

    
87
    return ptr;
88
}
89

    
90
/**
91
 * free all static arrays and reset pointers to 0.
92
 */
93
void av_free_static(void)
94
{
95
    while(last_static){
96
        av_freep(&array_static[--last_static]);
97
    }
98
    av_freep(&array_static);
99
}
100

    
101
/**
102
 * Frees memory and sets the pointer to NULL.
103
 * @param arg pointer to the pointer which should be freed
104
 */
105
void av_freep(void *arg)
106
{
107
    void **ptr= (void**)arg;
108
    av_free(*ptr);
109
    *ptr = NULL;
110
}
111

    
112
/* encoder management */
113
AVCodec *first_avcodec;
114

    
115
void register_avcodec(AVCodec *format)
116
{
117
    AVCodec **p;
118
    p = &first_avcodec;
119
    while (*p != NULL) p = &(*p)->next;
120
    *p = format;
121
    format->next = NULL;
122
}
123

    
124
typedef struct InternalBuffer{
125
    int last_pic_num;
126
    uint8_t *base[4];
127
    uint8_t *data[4];
128
    int linesize[4];
129
}InternalBuffer;
130

    
131
#define INTERNAL_BUFFER_SIZE 32
132

    
133
#define ALIGN(x, a) (((x)+(a)-1)&~((a)-1))
134

    
135
void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height){
136
    int w_align= 1;    
137
    int h_align= 1;    
138
    
139
    switch(s->pix_fmt){
140
    case PIX_FMT_YUV420P:
141
    case PIX_FMT_YUV422:
142
    case PIX_FMT_YUV422P:
143
    case PIX_FMT_YUV444P:
144
    case PIX_FMT_GRAY8:
145
    case PIX_FMT_YUVJ420P:
146
    case PIX_FMT_YUVJ422P:
147
    case PIX_FMT_YUVJ444P:
148
        w_align= 16; //FIXME check for non mpeg style codecs and use less alignment
149
        h_align= 16;
150
        break;
151
    case PIX_FMT_YUV411P:
152
        w_align=32;
153
        h_align=8;
154
        break;
155
    case PIX_FMT_YUV410P:
156
        if(s->codec_id == CODEC_ID_SVQ1){
157
            w_align=64;
158
            h_align=64;
159
        }
160
        break;
161
    default:
162
        w_align= 1;
163
        h_align= 1;
164
        break;
165
    }
166

    
167
    *width = ALIGN(*width , w_align);
168
    *height= ALIGN(*height, h_align);
169
}
170

    
171
int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
172
    int i;
173
    int w= s->width;
174
    int h= s->height;
175
    InternalBuffer *buf;
176
    int *picture_number;
177
    
178
    assert(pic->data[0]==NULL);
179
    assert(INTERNAL_BUFFER_SIZE > s->internal_buffer_count);
180

    
181
    if(s->internal_buffer==NULL){
182
        s->internal_buffer= av_mallocz(INTERNAL_BUFFER_SIZE*sizeof(InternalBuffer));
183
    }
184
#if 0
185
    s->internal_buffer= av_fast_realloc(
186
        s->internal_buffer, 
187
        &s->internal_buffer_size, 
188
        sizeof(InternalBuffer)*FFMAX(99,  s->internal_buffer_count+1)/*FIXME*/
189
        );
190
#endif
191
     
192
    buf= &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
193
    picture_number= &(((InternalBuffer*)s->internal_buffer)[INTERNAL_BUFFER_SIZE-1]).last_pic_num; //FIXME ugly hack
194
    (*picture_number)++;
195
    
196
    if(buf->base[0]){
197
        pic->age= *picture_number - buf->last_pic_num;
198
        buf->last_pic_num= *picture_number;
199
    }else{
200
        int h_chroma_shift, v_chroma_shift;
201
        int s_align, pixel_size;
202
        
203
        avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
204
        
205
        switch(s->pix_fmt){
206
        case PIX_FMT_RGB555:
207
        case PIX_FMT_RGB565:
208
        case PIX_FMT_YUV422:
209
            pixel_size=2;
210
            break;
211
        case PIX_FMT_RGB24:
212
        case PIX_FMT_BGR24:
213
            pixel_size=3;
214
            break;
215
        case PIX_FMT_RGBA32:
216
            pixel_size=4;
217
            break;
218
        default:
219
            pixel_size=1;
220
        }
221

    
222
        avcodec_align_dimensions(s, &w, &h);
223
#if defined(ARCH_POWERPC) || defined(HAVE_MMI) //FIXME some cleaner check
224
        s_align= 16;
225
#else
226
        s_align= 8;
227
#endif
228
            
229
        if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
230
            w+= EDGE_WIDTH*2;
231
            h+= EDGE_WIDTH*2;
232
        }
233
        
234
        buf->last_pic_num= -256*256*256*64;
235

    
236
        for(i=0; i<3; i++){
237
            const int h_shift= i==0 ? 0 : h_chroma_shift;
238
            const int v_shift= i==0 ? 0 : v_chroma_shift;
239

    
240
            //FIXME next ensures that linesize= 2^x uvlinesize, thats needed because some MC code assumes it
241
            buf->linesize[i]= ALIGN(pixel_size*w>>h_shift, s_align<<(h_chroma_shift-h_shift)); 
242

    
243
            buf->base[i]= av_mallocz((buf->linesize[i]*h>>v_shift)+16); //FIXME 16
244
            if(buf->base[i]==NULL) return -1;
245
            memset(buf->base[i], 128, buf->linesize[i]*h>>v_shift);
246
        
247
            if(s->flags&CODEC_FLAG_EMU_EDGE)
248
                buf->data[i] = buf->base[i];
249
            else
250
                buf->data[i] = buf->base[i] + ALIGN((buf->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift), s_align);
251
        }
252
        pic->age= 256*256*256*64;
253
    }
254
    pic->type= FF_BUFFER_TYPE_INTERNAL;
255

    
256
    for(i=0; i<4; i++){
257
        pic->base[i]= buf->base[i];
258
        pic->data[i]= buf->data[i];
259
        pic->linesize[i]= buf->linesize[i];
260
    }
261
    s->internal_buffer_count++;
262

    
263
    return 0;
264
}
265

    
266
void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
267
    int i;
268
    InternalBuffer *buf, *last, temp;
269

    
270
    assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
271
    assert(s->internal_buffer_count);
272

    
273
    buf = NULL; /* avoids warning */
274
    for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
275
        buf= &((InternalBuffer*)s->internal_buffer)[i];
276
        if(buf->data[0] == pic->data[0])
277
            break;
278
    }
279
    assert(i < s->internal_buffer_count);
280
    s->internal_buffer_count--;
281
    last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
282

    
283
    temp= *buf;
284
    *buf= *last;
285
    *last= temp;
286

    
287
    for(i=0; i<3; i++){
288
        pic->data[i]=NULL;
289
//        pic->base[i]=NULL;
290
    }
291
//printf("R%X\n", pic->opaque);
292
}
293

    
294
int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic){
295
    AVFrame temp_pic;
296
    int i;
297

    
298
    /* If no picture return a new buffer */
299
    if(pic->data[0] == NULL) {
300
        /* We will copy from buffer, so must be readable */
301
        pic->buffer_hints |= FF_BUFFER_HINTS_READABLE;
302
        return s->get_buffer(s, pic);
303
    }
304

    
305
    /* If internal buffer type return the same buffer */
306
    if(pic->type == FF_BUFFER_TYPE_INTERNAL)
307
        return 0;
308

    
309
    /*
310
     * Not internal type and reget_buffer not overridden, emulate cr buffer
311
     */
312
    temp_pic = *pic;
313
    for(i = 0; i < 4; i++)
314
        pic->data[i] = pic->base[i] = NULL;
315
    pic->opaque = NULL;
316
    /* Allocate new frame */
317
    if (s->get_buffer(s, pic))
318
        return -1;
319
    /* Copy image data from old buffer to new buffer */
320
    img_copy((AVPicture*)pic, (AVPicture*)&temp_pic, s->pix_fmt, s->width,
321
             s->height);
322
    s->release_buffer(s, &temp_pic); // Release old frame
323
    return 0;
324
}
325

    
326
int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count){
327
    int i;
328

    
329
    for(i=0; i<count; i++){
330
        int r= func(c, arg[i]);
331
        if(ret) ret[i]= r;
332
    }
333
    return 0;
334
}
335

    
336
enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt){
337
    return fmt[0];
338
}
339

    
340
static const char* context_to_name(void* ptr) {
341
    AVCodecContext *avc= ptr;
342

    
343
    if(avc && avc->codec && avc->codec->name)
344
        return avc->codec->name; 
345
    else
346
        return "NULL";
347
}
348

    
349
static AVClass av_codec_context_class = { "AVCodecContext", context_to_name };
350

    
351
void avcodec_get_context_defaults(AVCodecContext *s){
352
    memset(s, 0, sizeof(AVCodecContext));
353

    
354
    s->av_class= &av_codec_context_class;
355
    s->bit_rate= 800*1000;
356
    s->bit_rate_tolerance= s->bit_rate*10;
357
    s->qmin= 2;
358
    s->qmax= 31;
359
    s->mb_qmin= 2;
360
    s->mb_qmax= 31;
361
    s->rc_eq= "tex^qComp";
362
    s->qcompress= 0.5;
363
    s->max_qdiff= 3;
364
    s->b_quant_factor=1.25;
365
    s->b_quant_offset=1.25;
366
    s->i_quant_factor=-0.8;
367
    s->i_quant_offset=0.0;
368
    s->error_concealment= 3;
369
    s->error_resilience= 1;
370
    s->workaround_bugs= FF_BUG_AUTODETECT;
371
    s->frame_rate_base= 1;
372
    s->frame_rate = 25;
373
    s->gop_size= 50;
374
    s->me_method= ME_EPZS;
375
    s->get_buffer= avcodec_default_get_buffer;
376
    s->release_buffer= avcodec_default_release_buffer;
377
    s->get_format= avcodec_default_get_format;
378
    s->execute= avcodec_default_execute;
379
    s->thread_count=1;
380
    s->me_subpel_quality=8;
381
    s->lmin= FF_QP2LAMBDA * s->qmin;
382
    s->lmax= FF_QP2LAMBDA * s->qmax;
383
    s->sample_aspect_ratio= (AVRational){0,1};
384
    s->ildct_cmp= FF_CMP_VSAD;
385
    
386
    s->intra_quant_bias= FF_DEFAULT_QUANT_BIAS;
387
    s->inter_quant_bias= FF_DEFAULT_QUANT_BIAS;
388
    s->palctrl = NULL;
389
    s->reget_buffer= avcodec_default_reget_buffer;
390
}
391

    
392
/**
393
 * allocates a AVCodecContext and set it to defaults.
394
 * this can be deallocated by simply calling free() 
395
 */
396
AVCodecContext *avcodec_alloc_context(void){
397
    AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
398
    
399
    if(avctx==NULL) return NULL;
400
    
401
    avcodec_get_context_defaults(avctx);
402
    
403
    return avctx;
404
}
405

    
406
void avcodec_get_frame_defaults(AVFrame *pic){
407
    memset(pic, 0, sizeof(AVFrame));
408

    
409
    pic->pts= AV_NOPTS_VALUE;
410
}
411

    
412
/**
413
 * allocates a AVPFrame and set it to defaults.
414
 * this can be deallocated by simply calling free() 
415
 */
416
AVFrame *avcodec_alloc_frame(void){
417
    AVFrame *pic= av_malloc(sizeof(AVFrame));
418
    
419
    if(pic==NULL) return NULL;
420
    
421
    avcodec_get_frame_defaults(pic);
422
    
423
    return pic;
424
}
425

    
426
int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
427
{
428
    int ret;
429

    
430
    if(avctx->codec)
431
        return -1;
432

    
433
    avctx->codec = codec;
434
    avctx->codec_id = codec->id;
435
    avctx->frame_number = 0;
436
    if (codec->priv_data_size > 0) {
437
        avctx->priv_data = av_mallocz(codec->priv_data_size);
438
        if (!avctx->priv_data) 
439
            return -ENOMEM;
440
    } else {
441
        avctx->priv_data = NULL;
442
    }
443
    ret = avctx->codec->init(avctx);
444
    if (ret < 0) {
445
        av_freep(&avctx->priv_data);
446
        return ret;
447
    }
448
    return 0;
449
}
450

    
451
int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size, 
452
                         const short *samples)
453
{
454
    int ret;
455

    
456
    ret = avctx->codec->encode(avctx, buf, buf_size, (void *)samples);
457
    avctx->frame_number++;
458
    return ret;
459
}
460

    
461
int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size, 
462
                         const AVFrame *pict)
463
{
464
    int ret;
465

    
466
    ret = avctx->codec->encode(avctx, buf, buf_size, (void *)pict);
467
    
468
    emms_c(); //needed to avoid a emms_c() call before every return;
469

    
470
    avctx->frame_number++;
471
    return ret;
472
}
473

    
474
/** 
475
 * decode a frame. 
476
 * @param buf bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE larger then the actual read bytes
477
 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
478
 * @param buf_size the size of the buffer in bytes
479
 * @param got_picture_ptr zero if no frame could be decompressed, Otherwise, it is non zero
480
 * @return -1 if error, otherwise return the number of
481
 * bytes used. 
482
 */
483
int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture, 
484
                         int *got_picture_ptr,
485
                         uint8_t *buf, int buf_size)
486
{
487
    int ret;
488
    
489
    ret = avctx->codec->decode(avctx, picture, got_picture_ptr, 
490
                               buf, buf_size);
491

    
492
    emms_c(); //needed to avoid a emms_c() call before every return;
493
    
494
    if (*got_picture_ptr)                           
495
        avctx->frame_number++;
496
    return ret;
497
}
498

    
499
/* decode an audio frame. return -1 if error, otherwise return the
500
   *number of bytes used. If no frame could be decompressed,
501
   *frame_size_ptr is zero. Otherwise, it is the decompressed frame
502
   *size in BYTES. */
503
int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples, 
504
                         int *frame_size_ptr,
505
                         uint8_t *buf, int buf_size)
506
{
507
    int ret;
508

    
509
    ret = avctx->codec->decode(avctx, samples, frame_size_ptr, 
510
                               buf, buf_size);
511
    avctx->frame_number++;
512
    return ret;
513
}
514

    
515
int avcodec_close(AVCodecContext *avctx)
516
{
517
    if (avctx->codec->close)
518
        avctx->codec->close(avctx);
519
    avcodec_default_free_buffers(avctx);
520
    av_freep(&avctx->priv_data);
521
    avctx->codec = NULL;
522
    return 0;
523
}
524

    
525
AVCodec *avcodec_find_encoder(enum CodecID id)
526
{
527
    AVCodec *p;
528
    p = first_avcodec;
529
    while (p) {
530
        if (p->encode != NULL && p->id == id)
531
            return p;
532
        p = p->next;
533
    }
534
    return NULL;
535
}
536

    
537
AVCodec *avcodec_find_encoder_by_name(const char *name)
538
{
539
    AVCodec *p;
540
    p = first_avcodec;
541
    while (p) {
542
        if (p->encode != NULL && strcmp(name,p->name) == 0)
543
            return p;
544
        p = p->next;
545
    }
546
    return NULL;
547
}
548

    
549
AVCodec *avcodec_find_decoder(enum CodecID id)
550
{
551
    AVCodec *p;
552
    p = first_avcodec;
553
    while (p) {
554
        if (p->decode != NULL && p->id == id)
555
            return p;
556
        p = p->next;
557
    }
558
    return NULL;
559
}
560

    
561
AVCodec *avcodec_find_decoder_by_name(const char *name)
562
{
563
    AVCodec *p;
564
    p = first_avcodec;
565
    while (p) {
566
        if (p->decode != NULL && strcmp(name,p->name) == 0)
567
            return p;
568
        p = p->next;
569
    }
570
    return NULL;
571
}
572

    
573
AVCodec *avcodec_find(enum CodecID id)
574
{
575
    AVCodec *p;
576
    p = first_avcodec;
577
    while (p) {
578
        if (p->id == id)
579
            return p;
580
        p = p->next;
581
    }
582
    return NULL;
583
}
584

    
585
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
586
{
587
    const char *codec_name;
588
    AVCodec *p;
589
    char buf1[32];
590
    char channels_str[100];
591
    int bitrate;
592

    
593
    if (encode)
594
        p = avcodec_find_encoder(enc->codec_id);
595
    else
596
        p = avcodec_find_decoder(enc->codec_id);
597

    
598
    if (p) {
599
        codec_name = p->name;
600
        if (!encode && enc->codec_id == CODEC_ID_MP3) {
601
            if (enc->sub_id == 2)
602
                codec_name = "mp2";
603
            else if (enc->sub_id == 1)
604
                codec_name = "mp1";
605
        }
606
    } else if (enc->codec_id == CODEC_ID_MPEG2TS) {
607
        /* fake mpeg2 transport stream codec (currently not
608
           registered) */
609
        codec_name = "mpeg2ts";
610
    } else if (enc->codec_name[0] != '\0') {
611
        codec_name = enc->codec_name;
612
    } else {
613
        /* output avi tags */
614
        if (enc->codec_type == CODEC_TYPE_VIDEO) {
615
            snprintf(buf1, sizeof(buf1), "%c%c%c%c", 
616
                     enc->codec_tag & 0xff,
617
                     (enc->codec_tag >> 8) & 0xff,
618
                     (enc->codec_tag >> 16) & 0xff,
619
                     (enc->codec_tag >> 24) & 0xff);
620
        } else {
621
            snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
622
        }
623
        codec_name = buf1;
624
    }
625

    
626
    switch(enc->codec_type) {
627
    case CODEC_TYPE_VIDEO:
628
        snprintf(buf, buf_size,
629
                 "Video: %s%s",
630
                 codec_name, enc->mb_decision ? " (hq)" : "");
631
        if (enc->codec_id == CODEC_ID_RAWVIDEO) {
632
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
633
                     ", %s",
634
                     avcodec_get_pix_fmt_name(enc->pix_fmt));
635
        }
636
        if (enc->width) {
637
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
638
                     ", %dx%d, %0.2f fps",
639
                     enc->width, enc->height, 
640
                     (float)enc->frame_rate / enc->frame_rate_base);
641
        }
642
        if (encode) {
643
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
644
                     ", q=%d-%d", enc->qmin, enc->qmax);
645
        }
646
        bitrate = enc->bit_rate;
647
        break;
648
    case CODEC_TYPE_AUDIO:
649
        snprintf(buf, buf_size,
650
                 "Audio: %s",
651
                 codec_name);
652
        switch (enc->channels) {
653
            case 1:
654
                strcpy(channels_str, "mono");
655
                break;
656
            case 2:
657
                strcpy(channels_str, "stereo");
658
                break;
659
            case 6:
660
                strcpy(channels_str, "5:1");
661
                break;
662
            default:
663
                sprintf(channels_str, "%d channels", enc->channels);
664
                break;
665
        }
666
        if (enc->sample_rate) {
667
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
668
                     ", %d Hz, %s",
669
                     enc->sample_rate,
670
                     channels_str);
671
        }
672
        
673
        /* for PCM codecs, compute bitrate directly */
674
        switch(enc->codec_id) {
675
        case CODEC_ID_PCM_S16LE:
676
        case CODEC_ID_PCM_S16BE:
677
        case CODEC_ID_PCM_U16LE:
678
        case CODEC_ID_PCM_U16BE:
679
            bitrate = enc->sample_rate * enc->channels * 16;
680
            break;
681
        case CODEC_ID_PCM_S8:
682
        case CODEC_ID_PCM_U8:
683
        case CODEC_ID_PCM_ALAW:
684
        case CODEC_ID_PCM_MULAW:
685
            bitrate = enc->sample_rate * enc->channels * 8;
686
            break;
687
        default:
688
            bitrate = enc->bit_rate;
689
            break;
690
        }
691
        break;
692
    case CODEC_TYPE_DATA:
693
        snprintf(buf, buf_size, "Data: %s", codec_name);
694
        bitrate = enc->bit_rate;
695
        break;
696
    default:
697
        av_abort();
698
    }
699
    if (encode) {
700
        if (enc->flags & CODEC_FLAG_PASS1)
701
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
702
                     ", pass 1");
703
        if (enc->flags & CODEC_FLAG_PASS2)
704
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
705
                     ", pass 2");
706
    }
707
    if (bitrate != 0) {
708
        snprintf(buf + strlen(buf), buf_size - strlen(buf), 
709
                 ", %d kb/s", bitrate / 1000);
710
    }
711
}
712

    
713
unsigned avcodec_version( void )
714
{
715
  return LIBAVCODEC_VERSION_INT;
716
}
717

    
718
unsigned avcodec_build( void )
719
{
720
  return LIBAVCODEC_BUILD;
721
}
722

    
723
/* must be called before any other functions */
724
void avcodec_init(void)
725
{
726
    static int inited = 0;
727

    
728
    if (inited != 0)
729
        return;
730
    inited = 1;
731

    
732
    dsputil_static_init();
733
}
734

    
735
/**
736
 * Flush buffers, should be called when seeking or when swicthing to a different stream.
737
 */
738
void avcodec_flush_buffers(AVCodecContext *avctx)
739
{
740
    if(avctx->codec->flush)
741
        avctx->codec->flush(avctx);
742
}
743

    
744
static void avcodec_default_free_buffers(AVCodecContext *s){
745
    int i, j;
746

    
747
    if(s->internal_buffer==NULL) return;
748
    
749
    for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
750
        InternalBuffer *buf= &((InternalBuffer*)s->internal_buffer)[i];
751
        for(j=0; j<4; j++){
752
            av_freep(&buf->base[j]);
753
            buf->data[j]= NULL;
754
        }
755
    }
756
    av_freep(&s->internal_buffer);
757
    
758
    s->internal_buffer_count=0;
759
}
760

    
761
char av_get_pict_type_char(int pict_type){
762
    switch(pict_type){
763
    case I_TYPE: return 'I'; 
764
    case P_TYPE: return 'P'; 
765
    case B_TYPE: return 'B'; 
766
    case S_TYPE: return 'S'; 
767
    case SI_TYPE:return 'i'; 
768
    case SP_TYPE:return 'p'; 
769
    default:     return '?';
770
    }
771
}
772

    
773
int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
774
    int exact=1, sign=0;
775
    int64_t gcd;
776

    
777
    assert(den != 0);
778

    
779
    if(den < 0)
780
        return av_reduce(dst_nom, dst_den, -nom, -den, max);
781
    
782
    sign= nom < 0;
783
    nom= ABS(nom);
784
    
785
    gcd = ff_gcd(nom, den);
786
    nom /= gcd;
787
    den /= gcd;
788
    
789
    if(nom > max || den > max){
790
        AVRational a0={0,1}, a1={1,0};
791
        exact=0;
792

    
793
        for(;;){
794
            int64_t x= nom / den;
795
            int64_t a2n= x*a1.num + a0.num;
796
            int64_t a2d= x*a1.den + a0.den;
797

    
798
            if(a2n > max || a2d > max) break;
799

    
800
            nom %= den;
801
        
802
            a0= a1;
803
            a1= (AVRational){a2n, a2d};
804
            if(nom==0) break;
805
            x= nom; nom=den; den=x;
806
        }
807
        nom= a1.num;
808
        den= a1.den;
809
    }
810
    
811
    assert(ff_gcd(nom, den) == 1);
812
    
813
    *dst_nom = sign ? -nom : nom;
814
    *dst_den = den;
815
    
816
    return exact;
817
}
818

    
819
int64_t av_rescale(int64_t a, int b, int c){
820
    uint64_t h, l;
821
    assert(c > 0);
822
    assert(b >=0);
823
    
824
    if(a<0) return -av_rescale(-a, b, c);
825
    
826
    h= a>>32;
827
    if(h==0) return a*b/c;
828
    
829
    l= a&0xFFFFFFFF;
830
    l *= b;
831
    h *= b;
832

    
833
    l += (h%c)<<32;
834

    
835
    return ((h/c)<<32) + l/c;
836
}
837

    
838
/* av_log API */
839

    
840
static int av_log_level = AV_LOG_DEBUG;
841

    
842
static void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl)
843
{
844
    static int print_prefix=1;
845
    AVClass* avc= ptr ? *(AVClass**)ptr : NULL;
846
    if(level>av_log_level)
847
        return;
848
#undef fprintf
849
    if(print_prefix && avc) {
850
            fprintf(stderr, "[%s @ %p]", avc->item_name(ptr), avc);
851
    }
852
#define fprintf please_use_av_log
853
        
854
    print_prefix= strstr(fmt, "\n") != NULL;
855
        
856
    vfprintf(stderr, fmt, vl);
857
}
858

    
859
static void (*av_log_callback)(void*, int, const char*, va_list) = av_log_default_callback;
860

    
861
void av_log(void* avcl, int level, const char *fmt, ...)
862
{
863
    va_list vl;
864
    va_start(vl, fmt);
865
    av_vlog(avcl, level, fmt, vl);
866
    va_end(vl);
867
}
868

    
869
void av_vlog(void* avcl, int level, const char *fmt, va_list vl)
870
{
871
    av_log_callback(avcl, level, fmt, vl);
872
}
873

    
874
int av_log_get_level(void)
875
{
876
    return av_log_level;
877
}
878

    
879
void av_log_set_level(int level)
880
{
881
    av_log_level = level;
882
}
883

    
884
void av_log_set_callback(void (*callback)(void*, int, const char*, va_list))
885
{
886
    av_log_callback = callback;
887
}
888