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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
5
 * 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
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 * License as published by the Free Software Foundation; either
10
 * version 2 of the License, or (at your option) any later version.
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 *
12
 * 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 "integer.h"
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#include <stdarg.h>
32
#include <limits.h>
33

    
34
static void avcodec_default_free_buffers(AVCodecContext *s);
35

    
36
void *av_mallocz(unsigned int size)
37
{
38
    void *ptr;
39
    
40
    ptr = av_malloc(size);
41
    if (!ptr)
42
        return NULL;
43
    memset(ptr, 0, size);
44
    return ptr;
45
}
46

    
47
char *av_strdup(const char *s)
48
{
49
    char *ptr;
50
    int len;
51
    len = strlen(s) + 1;
52
    ptr = av_malloc(len);
53
    if (!ptr)
54
        return NULL;
55
    memcpy(ptr, s, len);
56
    return ptr;
57
}
58

    
59
/**
60
 * realloc which does nothing if the block is large enough
61
 */
62
void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size)
63
{
64
    if(min_size < *size) 
65
        return ptr;
66
    
67
    *size= 17*min_size/16 + 32;
68

    
69
    return av_realloc(ptr, *size);
70
}
71

    
72

    
73
static unsigned int last_static = 0;
74
static unsigned int allocated_static = 0;
75
static void** array_static = NULL;
76

    
77
/**
78
 * allocation of static arrays - do not use for normal allocation.
79
 */
80
void *av_mallocz_static(unsigned int size)
81
{
82
    void *ptr = av_mallocz(size);
83

    
84
    if(ptr){ 
85
        array_static =av_fast_realloc(array_static, &allocated_static, sizeof(void*)*(last_static+1));
86
        array_static[last_static++] = ptr;
87
    }
88

    
89
    return ptr;
90
}
91

    
92
/**
93
 * free all static arrays and reset pointers to 0.
94
 */
95
void av_free_static(void)
96
{
97
    while(last_static){
98
        av_freep(&array_static[--last_static]);
99
    }
100
    av_freep(&array_static);
101
}
102

    
103
/**
104
 * Frees memory and sets the pointer to NULL.
105
 * @param arg pointer to the pointer which should be freed
106
 */
107
void av_freep(void *arg)
108
{
109
    void **ptr= (void**)arg;
110
    av_free(*ptr);
111
    *ptr = NULL;
112
}
113

    
114
/* encoder management */
115
AVCodec *first_avcodec;
116

    
117
void register_avcodec(AVCodec *format)
118
{
119
    AVCodec **p;
120
    p = &first_avcodec;
121
    while (*p != NULL) p = &(*p)->next;
122
    *p = format;
123
    format->next = NULL;
124
}
125

    
126
typedef struct InternalBuffer{
127
    int last_pic_num;
128
    uint8_t *base[4];
129
    uint8_t *data[4];
130
    int linesize[4];
131
}InternalBuffer;
132

    
133
#define INTERNAL_BUFFER_SIZE 32
134

    
135
#define ALIGN(x, a) (((x)+(a)-1)&~((a)-1))
136

    
137
void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height){
138
    int w_align= 1;    
139
    int h_align= 1;    
140
    
141
    switch(s->pix_fmt){
142
    case PIX_FMT_YUV420P:
143
    case PIX_FMT_YUV422:
144
    case PIX_FMT_UYVY422:
145
    case PIX_FMT_YUV422P:
146
    case PIX_FMT_YUV444P:
147
    case PIX_FMT_GRAY8:
148
    case PIX_FMT_YUVJ420P:
149
    case PIX_FMT_YUVJ422P:
150
    case PIX_FMT_YUVJ444P:
151
        w_align= 16; //FIXME check for non mpeg style codecs and use less alignment
152
        h_align= 16;
153
        break;
154
    case PIX_FMT_YUV411P:
155
        w_align=32;
156
        h_align=8;
157
        break;
158
    case PIX_FMT_YUV410P:
159
        if(s->codec_id == CODEC_ID_SVQ1){
160
            w_align=64;
161
            h_align=64;
162
        }
163
    case PIX_FMT_RGB555:
164
        if(s->codec_id == CODEC_ID_RPZA){
165
            w_align=4;
166
            h_align=4;
167
        }
168
    case PIX_FMT_PAL8:
169
        if(s->codec_id == CODEC_ID_SMC){
170
            w_align=4;
171
            h_align=4;
172
        }
173
        break;
174
    default:
175
        w_align= 1;
176
        h_align= 1;
177
        break;
178
    }
179

    
180
    *width = ALIGN(*width , w_align);
181
    *height= ALIGN(*height, h_align);
182
}
183

    
184
int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
185
    int i;
186
    int w= s->width;
187
    int h= s->height;
188
    InternalBuffer *buf;
189
    int *picture_number;
190
    
191
    assert(pic->data[0]==NULL);
192
    assert(INTERNAL_BUFFER_SIZE > s->internal_buffer_count);
193

    
194
    if(s->internal_buffer==NULL){
195
        s->internal_buffer= av_mallocz(INTERNAL_BUFFER_SIZE*sizeof(InternalBuffer));
196
    }
197
#if 0
198
    s->internal_buffer= av_fast_realloc(
199
        s->internal_buffer, 
200
        &s->internal_buffer_size, 
201
        sizeof(InternalBuffer)*FFMAX(99,  s->internal_buffer_count+1)/*FIXME*/
202
        );
203
#endif
204
     
205
    buf= &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
206
    picture_number= &(((InternalBuffer*)s->internal_buffer)[INTERNAL_BUFFER_SIZE-1]).last_pic_num; //FIXME ugly hack
207
    (*picture_number)++;
208
    
209
    if(buf->base[0]){
210
        pic->age= *picture_number - buf->last_pic_num;
211
        buf->last_pic_num= *picture_number;
212
    }else{
213
        int h_chroma_shift, v_chroma_shift;
214
        int s_align, pixel_size;
215
        
216
        avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
217
        
218
        switch(s->pix_fmt){
219
        case PIX_FMT_RGB555:
220
        case PIX_FMT_RGB565:
221
        case PIX_FMT_YUV422:
222
        case PIX_FMT_UYVY422:
223
            pixel_size=2;
224
            break;
225
        case PIX_FMT_RGB24:
226
        case PIX_FMT_BGR24:
227
            pixel_size=3;
228
            break;
229
        case PIX_FMT_RGBA32:
230
            pixel_size=4;
231
            break;
232
        default:
233
            pixel_size=1;
234
        }
235

    
236
        avcodec_align_dimensions(s, &w, &h);
237
#if defined(ARCH_POWERPC) || defined(HAVE_MMI) //FIXME some cleaner check
238
        s_align= 16;
239
#else
240
        s_align= 8;
241
#endif
242
            
243
        if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
244
            w+= EDGE_WIDTH*2;
245
            h+= EDGE_WIDTH*2;
246
        }
247
        
248
        buf->last_pic_num= -256*256*256*64;
249

    
250
        for(i=0; i<3; i++){
251
            const int h_shift= i==0 ? 0 : h_chroma_shift;
252
            const int v_shift= i==0 ? 0 : v_chroma_shift;
253

    
254
            //FIXME next ensures that linesize= 2^x uvlinesize, thats needed because some MC code assumes it
255
            buf->linesize[i]= ALIGN(pixel_size*w>>h_shift, s_align<<(h_chroma_shift-h_shift)); 
256

    
257
            buf->base[i]= av_mallocz((buf->linesize[i]*h>>v_shift)+16); //FIXME 16
258
            if(buf->base[i]==NULL) return -1;
259
            memset(buf->base[i], 128, buf->linesize[i]*h>>v_shift);
260
        
261
            if(s->flags&CODEC_FLAG_EMU_EDGE)
262
                buf->data[i] = buf->base[i];
263
            else
264
                buf->data[i] = buf->base[i] + ALIGN((buf->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift), s_align);
265
        }
266
        pic->age= 256*256*256*64;
267
    }
268
    pic->type= FF_BUFFER_TYPE_INTERNAL;
269

    
270
    for(i=0; i<4; i++){
271
        pic->base[i]= buf->base[i];
272
        pic->data[i]= buf->data[i];
273
        pic->linesize[i]= buf->linesize[i];
274
    }
275
    s->internal_buffer_count++;
276

    
277
    return 0;
278
}
279

    
280
void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
281
    int i;
282
    InternalBuffer *buf, *last, temp;
283

    
284
    assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
285
    assert(s->internal_buffer_count);
286

    
287
    buf = NULL; /* avoids warning */
288
    for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
289
        buf= &((InternalBuffer*)s->internal_buffer)[i];
290
        if(buf->data[0] == pic->data[0])
291
            break;
292
    }
293
    assert(i < s->internal_buffer_count);
294
    s->internal_buffer_count--;
295
    last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
296

    
297
    temp= *buf;
298
    *buf= *last;
299
    *last= temp;
300

    
301
    for(i=0; i<3; i++){
302
        pic->data[i]=NULL;
303
//        pic->base[i]=NULL;
304
    }
305
//printf("R%X\n", pic->opaque);
306
}
307

    
308
int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic){
309
    AVFrame temp_pic;
310
    int i;
311

    
312
    /* If no picture return a new buffer */
313
    if(pic->data[0] == NULL) {
314
        /* We will copy from buffer, so must be readable */
315
        pic->buffer_hints |= FF_BUFFER_HINTS_READABLE;
316
        return s->get_buffer(s, pic);
317
    }
318

    
319
    /* If internal buffer type return the same buffer */
320
    if(pic->type == FF_BUFFER_TYPE_INTERNAL)
321
        return 0;
322

    
323
    /*
324
     * Not internal type and reget_buffer not overridden, emulate cr buffer
325
     */
326
    temp_pic = *pic;
327
    for(i = 0; i < 4; i++)
328
        pic->data[i] = pic->base[i] = NULL;
329
    pic->opaque = NULL;
330
    /* Allocate new frame */
331
    if (s->get_buffer(s, pic))
332
        return -1;
333
    /* Copy image data from old buffer to new buffer */
334
    img_copy((AVPicture*)pic, (AVPicture*)&temp_pic, s->pix_fmt, s->width,
335
             s->height);
336
    s->release_buffer(s, &temp_pic); // Release old frame
337
    return 0;
338
}
339

    
340
int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count){
341
    int i;
342

    
343
    for(i=0; i<count; i++){
344
        int r= func(c, arg[i]);
345
        if(ret) ret[i]= r;
346
    }
347
    return 0;
348
}
349

    
350
enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt){
351
    return fmt[0];
352
}
353

    
354
static const char* context_to_name(void* ptr) {
355
    AVCodecContext *avc= ptr;
356

    
357
    if(avc && avc->codec && avc->codec->name)
358
        return avc->codec->name; 
359
    else
360
        return "NULL";
361
}
362

    
363
static AVClass av_codec_context_class = { "AVCodecContext", context_to_name };
364

    
365
void avcodec_get_context_defaults(AVCodecContext *s){
366
    memset(s, 0, sizeof(AVCodecContext));
367

    
368
    s->av_class= &av_codec_context_class;
369
    s->bit_rate= 800*1000;
370
    s->bit_rate_tolerance= s->bit_rate*10;
371
    s->qmin= 2;
372
    s->qmax= 31;
373
    s->mb_qmin= 2;
374
    s->mb_qmax= 31;
375
    s->rc_eq= "tex^qComp";
376
    s->qcompress= 0.5;
377
    s->max_qdiff= 3;
378
    s->b_quant_factor=1.25;
379
    s->b_quant_offset=1.25;
380
    s->i_quant_factor=-0.8;
381
    s->i_quant_offset=0.0;
382
    s->error_concealment= 3;
383
    s->error_resilience= 1;
384
    s->workaround_bugs= FF_BUG_AUTODETECT;
385
    s->frame_rate_base= 1;
386
    s->frame_rate = 25;
387
    s->gop_size= 50;
388
    s->me_method= ME_EPZS;
389
    s->get_buffer= avcodec_default_get_buffer;
390
    s->release_buffer= avcodec_default_release_buffer;
391
    s->get_format= avcodec_default_get_format;
392
    s->execute= avcodec_default_execute;
393
    s->thread_count=1;
394
    s->me_subpel_quality=8;
395
    s->lmin= FF_QP2LAMBDA * s->qmin;
396
    s->lmax= FF_QP2LAMBDA * s->qmax;
397
    s->sample_aspect_ratio= (AVRational){0,1};
398
    s->ildct_cmp= FF_CMP_VSAD;
399
    s->profile= FF_PROFILE_UNKNOWN;
400
    s->level= FF_LEVEL_UNKNOWN;
401
    
402
    s->intra_quant_bias= FF_DEFAULT_QUANT_BIAS;
403
    s->inter_quant_bias= FF_DEFAULT_QUANT_BIAS;
404
    s->palctrl = NULL;
405
    s->reget_buffer= avcodec_default_reget_buffer;
406
}
407

    
408
/**
409
 * allocates a AVCodecContext and set it to defaults.
410
 * this can be deallocated by simply calling free() 
411
 */
412
AVCodecContext *avcodec_alloc_context(void){
413
    AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
414
    
415
    if(avctx==NULL) return NULL;
416
    
417
    avcodec_get_context_defaults(avctx);
418
    
419
    return avctx;
420
}
421

    
422
void avcodec_get_frame_defaults(AVFrame *pic){
423
    memset(pic, 0, sizeof(AVFrame));
424

    
425
    pic->pts= AV_NOPTS_VALUE;
426
}
427

    
428
/**
429
 * allocates a AVPFrame and set it to defaults.
430
 * this can be deallocated by simply calling free() 
431
 */
432
AVFrame *avcodec_alloc_frame(void){
433
    AVFrame *pic= av_malloc(sizeof(AVFrame));
434
    
435
    if(pic==NULL) return NULL;
436
    
437
    avcodec_get_frame_defaults(pic);
438
    
439
    return pic;
440
}
441

    
442
int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
443
{
444
    int ret;
445

    
446
    if(avctx->codec)
447
        return -1;
448

    
449
    avctx->codec = codec;
450
    avctx->codec_id = codec->id;
451
    avctx->frame_number = 0;
452
    if (codec->priv_data_size > 0) {
453
        avctx->priv_data = av_mallocz(codec->priv_data_size);
454
        if (!avctx->priv_data) 
455
            return -ENOMEM;
456
    } else {
457
        avctx->priv_data = NULL;
458
    }
459
    ret = avctx->codec->init(avctx);
460
    if (ret < 0) {
461
        av_freep(&avctx->priv_data);
462
        return ret;
463
    }
464
    return 0;
465
}
466

    
467
int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size, 
468
                         const short *samples)
469
{
470
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || samples){
471
        int ret = avctx->codec->encode(avctx, buf, buf_size, (void *)samples);
472
        avctx->frame_number++;
473
        return ret;
474
    }else
475
        return 0;
476
}
477

    
478
int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size, 
479
                         const AVFrame *pict)
480
{
481
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || pict){
482
        int ret = avctx->codec->encode(avctx, buf, buf_size, (void *)pict);
483
        avctx->frame_number++;
484
        emms_c(); //needed to avoid a emms_c() call before every return;
485
    
486
        return ret;
487
    }else
488
        return 0;
489
}
490

    
491
/** 
492
 * decode a frame. 
493
 * @param buf bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE larger then the actual read bytes
494
 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
495
 * @param buf_size the size of the buffer in bytes
496
 * @param got_picture_ptr zero if no frame could be decompressed, Otherwise, it is non zero
497
 * @return -1 if error, otherwise return the number of
498
 * bytes used. 
499
 */
500
int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture, 
501
                         int *got_picture_ptr,
502
                         uint8_t *buf, int buf_size)
503
{
504
    int ret;
505
    
506
    *got_picture_ptr= 0;
507
    ret = avctx->codec->decode(avctx, picture, got_picture_ptr, 
508
                               buf, buf_size);
509

    
510
    emms_c(); //needed to avoid a emms_c() call before every return;
511
    
512
    if (*got_picture_ptr)                           
513
        avctx->frame_number++;
514
    return ret;
515
}
516

    
517
/* decode an audio frame. return -1 if error, otherwise return the
518
   *number of bytes used. If no frame could be decompressed,
519
   *frame_size_ptr is zero. Otherwise, it is the decompressed frame
520
   *size in BYTES. */
521
int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples, 
522
                         int *frame_size_ptr,
523
                         uint8_t *buf, int buf_size)
524
{
525
    int ret;
526

    
527
    *frame_size_ptr= 0;
528
    ret = avctx->codec->decode(avctx, samples, frame_size_ptr, 
529
                               buf, buf_size);
530
    avctx->frame_number++;
531
    return ret;
532
}
533

    
534
int avcodec_close(AVCodecContext *avctx)
535
{
536
    if (avctx->codec->close)
537
        avctx->codec->close(avctx);
538
    avcodec_default_free_buffers(avctx);
539
    av_freep(&avctx->priv_data);
540
    avctx->codec = NULL;
541
    return 0;
542
}
543

    
544
AVCodec *avcodec_find_encoder(enum CodecID id)
545
{
546
    AVCodec *p;
547
    p = first_avcodec;
548
    while (p) {
549
        if (p->encode != NULL && p->id == id)
550
            return p;
551
        p = p->next;
552
    }
553
    return NULL;
554
}
555

    
556
AVCodec *avcodec_find_encoder_by_name(const char *name)
557
{
558
    AVCodec *p;
559
    p = first_avcodec;
560
    while (p) {
561
        if (p->encode != NULL && strcmp(name,p->name) == 0)
562
            return p;
563
        p = p->next;
564
    }
565
    return NULL;
566
}
567

    
568
AVCodec *avcodec_find_decoder(enum CodecID id)
569
{
570
    AVCodec *p;
571
    p = first_avcodec;
572
    while (p) {
573
        if (p->decode != NULL && p->id == id)
574
            return p;
575
        p = p->next;
576
    }
577
    return NULL;
578
}
579

    
580
AVCodec *avcodec_find_decoder_by_name(const char *name)
581
{
582
    AVCodec *p;
583
    p = first_avcodec;
584
    while (p) {
585
        if (p->decode != NULL && strcmp(name,p->name) == 0)
586
            return p;
587
        p = p->next;
588
    }
589
    return NULL;
590
}
591

    
592
static AVCodec *avcodec_find(enum CodecID id)
593
{
594
    AVCodec *p;
595
    p = first_avcodec;
596
    while (p) {
597
        if (p->id == id)
598
            return p;
599
        p = p->next;
600
    }
601
    return NULL;
602
}
603

    
604
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
605
{
606
    const char *codec_name;
607
    AVCodec *p;
608
    char buf1[32];
609
    char channels_str[100];
610
    int bitrate;
611

    
612
    if (encode)
613
        p = avcodec_find_encoder(enc->codec_id);
614
    else
615
        p = avcodec_find_decoder(enc->codec_id);
616

    
617
    if (p) {
618
        codec_name = p->name;
619
        if (!encode && enc->codec_id == CODEC_ID_MP3) {
620
            if (enc->sub_id == 2)
621
                codec_name = "mp2";
622
            else if (enc->sub_id == 1)
623
                codec_name = "mp1";
624
        }
625
    } else if (enc->codec_id == CODEC_ID_MPEG2TS) {
626
        /* fake mpeg2 transport stream codec (currently not
627
           registered) */
628
        codec_name = "mpeg2ts";
629
    } else if (enc->codec_name[0] != '\0') {
630
        codec_name = enc->codec_name;
631
    } else {
632
        /* output avi tags */
633
        if (enc->codec_type == CODEC_TYPE_VIDEO) {
634
            snprintf(buf1, sizeof(buf1), "%c%c%c%c", 
635
                     enc->codec_tag & 0xff,
636
                     (enc->codec_tag >> 8) & 0xff,
637
                     (enc->codec_tag >> 16) & 0xff,
638
                     (enc->codec_tag >> 24) & 0xff);
639
        } else {
640
            snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
641
        }
642
        codec_name = buf1;
643
    }
644

    
645
    switch(enc->codec_type) {
646
    case CODEC_TYPE_VIDEO:
647
        snprintf(buf, buf_size,
648
                 "Video: %s%s",
649
                 codec_name, enc->mb_decision ? " (hq)" : "");
650
        if (enc->codec_id == CODEC_ID_RAWVIDEO) {
651
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
652
                     ", %s",
653
                     avcodec_get_pix_fmt_name(enc->pix_fmt));
654
        }
655
        if (enc->width) {
656
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
657
                     ", %dx%d, %0.2f fps",
658
                     enc->width, enc->height, 
659
                     (float)enc->frame_rate / enc->frame_rate_base);
660
        }
661
        if (encode) {
662
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
663
                     ", q=%d-%d", enc->qmin, enc->qmax);
664
        }
665
        bitrate = enc->bit_rate;
666
        break;
667
    case CODEC_TYPE_AUDIO:
668
        snprintf(buf, buf_size,
669
                 "Audio: %s",
670
                 codec_name);
671
        switch (enc->channels) {
672
            case 1:
673
                strcpy(channels_str, "mono");
674
                break;
675
            case 2:
676
                strcpy(channels_str, "stereo");
677
                break;
678
            case 6:
679
                strcpy(channels_str, "5:1");
680
                break;
681
            default:
682
                sprintf(channels_str, "%d channels", enc->channels);
683
                break;
684
        }
685
        if (enc->sample_rate) {
686
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
687
                     ", %d Hz, %s",
688
                     enc->sample_rate,
689
                     channels_str);
690
        }
691
        
692
        /* for PCM codecs, compute bitrate directly */
693
        switch(enc->codec_id) {
694
        case CODEC_ID_PCM_S16LE:
695
        case CODEC_ID_PCM_S16BE:
696
        case CODEC_ID_PCM_U16LE:
697
        case CODEC_ID_PCM_U16BE:
698
            bitrate = enc->sample_rate * enc->channels * 16;
699
            break;
700
        case CODEC_ID_PCM_S8:
701
        case CODEC_ID_PCM_U8:
702
        case CODEC_ID_PCM_ALAW:
703
        case CODEC_ID_PCM_MULAW:
704
            bitrate = enc->sample_rate * enc->channels * 8;
705
            break;
706
        default:
707
            bitrate = enc->bit_rate;
708
            break;
709
        }
710
        break;
711
    case CODEC_TYPE_DATA:
712
        snprintf(buf, buf_size, "Data: %s", codec_name);
713
        bitrate = enc->bit_rate;
714
        break;
715
    default:
716
        av_abort();
717
    }
718
    if (encode) {
719
        if (enc->flags & CODEC_FLAG_PASS1)
720
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
721
                     ", pass 1");
722
        if (enc->flags & CODEC_FLAG_PASS2)
723
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
724
                     ", pass 2");
725
    }
726
    if (bitrate != 0) {
727
        snprintf(buf + strlen(buf), buf_size - strlen(buf), 
728
                 ", %d kb/s", bitrate / 1000);
729
    }
730
}
731

    
732
unsigned avcodec_version( void )
733
{
734
  return LIBAVCODEC_VERSION_INT;
735
}
736

    
737
unsigned avcodec_build( void )
738
{
739
  return LIBAVCODEC_BUILD;
740
}
741

    
742
/* must be called before any other functions */
743
void avcodec_init(void)
744
{
745
    static int inited = 0;
746

    
747
    if (inited != 0)
748
        return;
749
    inited = 1;
750

    
751
    dsputil_static_init();
752
}
753

    
754
/**
755
 * Flush buffers, should be called when seeking or when swicthing to a different stream.
756
 */
757
void avcodec_flush_buffers(AVCodecContext *avctx)
758
{
759
    if(avctx->codec->flush)
760
        avctx->codec->flush(avctx);
761
}
762

    
763
static void avcodec_default_free_buffers(AVCodecContext *s){
764
    int i, j;
765

    
766
    if(s->internal_buffer==NULL) return;
767
    
768
    for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
769
        InternalBuffer *buf= &((InternalBuffer*)s->internal_buffer)[i];
770
        for(j=0; j<4; j++){
771
            av_freep(&buf->base[j]);
772
            buf->data[j]= NULL;
773
        }
774
    }
775
    av_freep(&s->internal_buffer);
776
    
777
    s->internal_buffer_count=0;
778
}
779

    
780
char av_get_pict_type_char(int pict_type){
781
    switch(pict_type){
782
    case I_TYPE: return 'I'; 
783
    case P_TYPE: return 'P'; 
784
    case B_TYPE: return 'B'; 
785
    case S_TYPE: return 'S'; 
786
    case SI_TYPE:return 'i'; 
787
    case SP_TYPE:return 'p'; 
788
    default:     return '?';
789
    }
790
}
791

    
792
int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
793
    AVRational a0={0,1}, a1={1,0};
794
    int sign= (nom<0) ^ (den<0);
795
    int64_t gcd= ff_gcd(ABS(nom), ABS(den));
796

    
797
    nom = ABS(nom)/gcd;
798
    den = ABS(den)/gcd;
799
    if(nom<=max && den<=max){
800
        a1= (AVRational){nom, den};
801
        den=0;
802
    }
803
    
804
    while(den){
805
        int64_t x       = nom / den;
806
        int64_t next_den= nom - den*x;
807
        int64_t a2n= x*a1.num + a0.num;
808
        int64_t a2d= x*a1.den + a0.den;
809

    
810
        if(a2n > max || a2d > max) break;
811

    
812
        a0= a1;
813
        a1= (AVRational){a2n, a2d};
814
        nom= den;
815
        den= next_den;
816
    }
817
    assert(ff_gcd(a1.num, a1.den) == 1);
818
    
819
    *dst_nom = sign ? -a1.num : a1.num;
820
    *dst_den = a1.den;
821
    
822
    return den==0;
823
}
824

    
825
int64_t av_rescale(int64_t a, int64_t b, int64_t c){
826
    AVInteger ai, ci;
827
    assert(c > 0);
828
    assert(b >=0);
829
    
830
    if(a<0) return -av_rescale(-a, b, c);
831
    
832
    if(b<=INT_MAX && c<=INT_MAX){
833
        if(a<=INT_MAX)
834
            return (a * b + c/2)/c;
835
        else
836
            return a/c*b + (a%c*b + c/2)/c;
837
    }
838
    
839
    ai= av_mul_i(av_int2i(a), av_int2i(b));
840
    ci= av_int2i(c);
841
    ai= av_add_i(ai, av_shr_i(ci,1));
842
    
843
    return av_i2int(av_div_i(ai, ci));
844
}
845

    
846
/* av_log API */
847

    
848
static int av_log_level = AV_LOG_DEBUG;
849

    
850
static void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl)
851
{
852
    static int print_prefix=1;
853
    AVClass* avc= ptr ? *(AVClass**)ptr : NULL;
854
    if(level>av_log_level)
855
        return;
856
#undef fprintf
857
    if(print_prefix && avc) {
858
            fprintf(stderr, "[%s @ %p]", avc->item_name(ptr), avc);
859
    }
860
#define fprintf please_use_av_log
861
        
862
    print_prefix= strstr(fmt, "\n") != NULL;
863
        
864
    vfprintf(stderr, fmt, vl);
865
}
866

    
867
static void (*av_log_callback)(void*, int, const char*, va_list) = av_log_default_callback;
868

    
869
void av_log(void* avcl, int level, const char *fmt, ...)
870
{
871
    va_list vl;
872
    va_start(vl, fmt);
873
    av_vlog(avcl, level, fmt, vl);
874
    va_end(vl);
875
}
876

    
877
void av_vlog(void* avcl, int level, const char *fmt, va_list vl)
878
{
879
    av_log_callback(avcl, level, fmt, vl);
880
}
881

    
882
int av_log_get_level(void)
883
{
884
    return av_log_level;
885
}
886

    
887
void av_log_set_level(int level)
888
{
889
    av_log_level = level;
890
}
891

    
892
void av_log_set_callback(void (*callback)(void*, int, const char*, va_list))
893
{
894
    av_log_callback = callback;
895
}
896

    
897
#if !defined(HAVE_PTHREADS) && !defined(HAVE_W32THREADS)
898
int avcodec_thread_init(AVCodecContext *s, int thread_count){
899
    return -1;
900
}
901
#endif