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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
9
 * License as published by the Free Software Foundation; either
10
 * version 2 of the License, or (at your option) any later version.
11
 *
12
 * This library is distributed in the hope that it will be useful,
13
 * 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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 *
17
 * 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
19
 * 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"
31
#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_YUV422P:
145
    case PIX_FMT_YUV444P:
146
    case PIX_FMT_GRAY8:
147
    case PIX_FMT_YUVJ420P:
148
    case PIX_FMT_YUVJ422P:
149
    case PIX_FMT_YUVJ444P:
150
        w_align= 16; //FIXME check for non mpeg style codecs and use less alignment
151
        h_align= 16;
152
        break;
153
    case PIX_FMT_YUV411P:
154
        w_align=32;
155
        h_align=8;
156
        break;
157
    case PIX_FMT_YUV410P:
158
        if(s->codec_id == CODEC_ID_SVQ1){
159
            w_align=64;
160
            h_align=64;
161
        }
162
        break;
163
    default:
164
        w_align= 1;
165
        h_align= 1;
166
        break;
167
    }
168

    
169
    *width = ALIGN(*width , w_align);
170
    *height= ALIGN(*height, h_align);
171
}
172

    
173
int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
174
    int i;
175
    int w= s->width;
176
    int h= s->height;
177
    InternalBuffer *buf;
178
    int *picture_number;
179
    
180
    assert(pic->data[0]==NULL);
181
    assert(INTERNAL_BUFFER_SIZE > s->internal_buffer_count);
182

    
183
    if(s->internal_buffer==NULL){
184
        s->internal_buffer= av_mallocz(INTERNAL_BUFFER_SIZE*sizeof(InternalBuffer));
185
    }
186
#if 0
187
    s->internal_buffer= av_fast_realloc(
188
        s->internal_buffer, 
189
        &s->internal_buffer_size, 
190
        sizeof(InternalBuffer)*FFMAX(99,  s->internal_buffer_count+1)/*FIXME*/
191
        );
192
#endif
193
     
194
    buf= &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
195
    picture_number= &(((InternalBuffer*)s->internal_buffer)[INTERNAL_BUFFER_SIZE-1]).last_pic_num; //FIXME ugly hack
196
    (*picture_number)++;
197
    
198
    if(buf->base[0]){
199
        pic->age= *picture_number - buf->last_pic_num;
200
        buf->last_pic_num= *picture_number;
201
    }else{
202
        int h_chroma_shift, v_chroma_shift;
203
        int s_align, pixel_size;
204
        
205
        avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
206
        
207
        switch(s->pix_fmt){
208
        case PIX_FMT_RGB555:
209
        case PIX_FMT_RGB565:
210
        case PIX_FMT_YUV422:
211
            pixel_size=2;
212
            break;
213
        case PIX_FMT_RGB24:
214
        case PIX_FMT_BGR24:
215
            pixel_size=3;
216
            break;
217
        case PIX_FMT_RGBA32:
218
            pixel_size=4;
219
            break;
220
        default:
221
            pixel_size=1;
222
        }
223

    
224
        avcodec_align_dimensions(s, &w, &h);
225
#if defined(ARCH_POWERPC) || defined(HAVE_MMI) //FIXME some cleaner check
226
        s_align= 16;
227
#else
228
        s_align= 8;
229
#endif
230
            
231
        if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
232
            w+= EDGE_WIDTH*2;
233
            h+= EDGE_WIDTH*2;
234
        }
235
        
236
        buf->last_pic_num= -256*256*256*64;
237

    
238
        for(i=0; i<3; i++){
239
            const int h_shift= i==0 ? 0 : h_chroma_shift;
240
            const int v_shift= i==0 ? 0 : v_chroma_shift;
241

    
242
            //FIXME next ensures that linesize= 2^x uvlinesize, thats needed because some MC code assumes it
243
            buf->linesize[i]= ALIGN(pixel_size*w>>h_shift, s_align<<(h_chroma_shift-h_shift)); 
244

    
245
            buf->base[i]= av_mallocz((buf->linesize[i]*h>>v_shift)+16); //FIXME 16
246
            if(buf->base[i]==NULL) return -1;
247
            memset(buf->base[i], 128, buf->linesize[i]*h>>v_shift);
248
        
249
            if(s->flags&CODEC_FLAG_EMU_EDGE)
250
                buf->data[i] = buf->base[i];
251
            else
252
                buf->data[i] = buf->base[i] + ALIGN((buf->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift), s_align);
253
        }
254
        pic->age= 256*256*256*64;
255
    }
256
    pic->type= FF_BUFFER_TYPE_INTERNAL;
257

    
258
    for(i=0; i<4; i++){
259
        pic->base[i]= buf->base[i];
260
        pic->data[i]= buf->data[i];
261
        pic->linesize[i]= buf->linesize[i];
262
    }
263
    s->internal_buffer_count++;
264

    
265
    return 0;
266
}
267

    
268
void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
269
    int i;
270
    InternalBuffer *buf, *last, temp;
271

    
272
    assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
273
    assert(s->internal_buffer_count);
274

    
275
    buf = NULL; /* avoids warning */
276
    for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
277
        buf= &((InternalBuffer*)s->internal_buffer)[i];
278
        if(buf->data[0] == pic->data[0])
279
            break;
280
    }
281
    assert(i < s->internal_buffer_count);
282
    s->internal_buffer_count--;
283
    last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
284

    
285
    temp= *buf;
286
    *buf= *last;
287
    *last= temp;
288

    
289
    for(i=0; i<3; i++){
290
        pic->data[i]=NULL;
291
//        pic->base[i]=NULL;
292
    }
293
//printf("R%X\n", pic->opaque);
294
}
295

    
296
int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic){
297
    AVFrame temp_pic;
298
    int i;
299

    
300
    /* If no picture return a new buffer */
301
    if(pic->data[0] == NULL) {
302
        /* We will copy from buffer, so must be readable */
303
        pic->buffer_hints |= FF_BUFFER_HINTS_READABLE;
304
        return s->get_buffer(s, pic);
305
    }
306

    
307
    /* If internal buffer type return the same buffer */
308
    if(pic->type == FF_BUFFER_TYPE_INTERNAL)
309
        return 0;
310

    
311
    /*
312
     * Not internal type and reget_buffer not overridden, emulate cr buffer
313
     */
314
    temp_pic = *pic;
315
    for(i = 0; i < 4; i++)
316
        pic->data[i] = pic->base[i] = NULL;
317
    pic->opaque = NULL;
318
    /* Allocate new frame */
319
    if (s->get_buffer(s, pic))
320
        return -1;
321
    /* Copy image data from old buffer to new buffer */
322
    img_copy((AVPicture*)pic, (AVPicture*)&temp_pic, s->pix_fmt, s->width,
323
             s->height);
324
    s->release_buffer(s, &temp_pic); // Release old frame
325
    return 0;
326
}
327

    
328
int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count){
329
    int i;
330

    
331
    for(i=0; i<count; i++){
332
        int r= func(c, arg[i]);
333
        if(ret) ret[i]= r;
334
    }
335
    return 0;
336
}
337

    
338
enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt){
339
    return fmt[0];
340
}
341

    
342
static const char* context_to_name(void* ptr) {
343
    AVCodecContext *avc= ptr;
344

    
345
    if(avc && avc->codec && avc->codec->name)
346
        return avc->codec->name; 
347
    else
348
        return "NULL";
349
}
350

    
351
static AVClass av_codec_context_class = { "AVCodecContext", context_to_name };
352

    
353
void avcodec_get_context_defaults(AVCodecContext *s){
354
    memset(s, 0, sizeof(AVCodecContext));
355

    
356
    s->av_class= &av_codec_context_class;
357
    s->bit_rate= 800*1000;
358
    s->bit_rate_tolerance= s->bit_rate*10;
359
    s->qmin= 2;
360
    s->qmax= 31;
361
    s->mb_qmin= 2;
362
    s->mb_qmax= 31;
363
    s->rc_eq= "tex^qComp";
364
    s->qcompress= 0.5;
365
    s->max_qdiff= 3;
366
    s->b_quant_factor=1.25;
367
    s->b_quant_offset=1.25;
368
    s->i_quant_factor=-0.8;
369
    s->i_quant_offset=0.0;
370
    s->error_concealment= 3;
371
    s->error_resilience= 1;
372
    s->workaround_bugs= FF_BUG_AUTODETECT;
373
    s->frame_rate_base= 1;
374
    s->frame_rate = 25;
375
    s->gop_size= 50;
376
    s->me_method= ME_EPZS;
377
    s->get_buffer= avcodec_default_get_buffer;
378
    s->release_buffer= avcodec_default_release_buffer;
379
    s->get_format= avcodec_default_get_format;
380
    s->execute= avcodec_default_execute;
381
    s->thread_count=1;
382
    s->me_subpel_quality=8;
383
    s->lmin= FF_QP2LAMBDA * s->qmin;
384
    s->lmax= FF_QP2LAMBDA * s->qmax;
385
    s->sample_aspect_ratio= (AVRational){0,1};
386
    s->ildct_cmp= FF_CMP_VSAD;
387
    
388
    s->intra_quant_bias= FF_DEFAULT_QUANT_BIAS;
389
    s->inter_quant_bias= FF_DEFAULT_QUANT_BIAS;
390
    s->palctrl = NULL;
391
    s->reget_buffer= avcodec_default_reget_buffer;
392
}
393

    
394
/**
395
 * allocates a AVCodecContext and set it to defaults.
396
 * this can be deallocated by simply calling free() 
397
 */
398
AVCodecContext *avcodec_alloc_context(void){
399
    AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
400
    
401
    if(avctx==NULL) return NULL;
402
    
403
    avcodec_get_context_defaults(avctx);
404
    
405
    return avctx;
406
}
407

    
408
void avcodec_get_frame_defaults(AVFrame *pic){
409
    memset(pic, 0, sizeof(AVFrame));
410

    
411
    pic->pts= AV_NOPTS_VALUE;
412
}
413

    
414
/**
415
 * allocates a AVPFrame and set it to defaults.
416
 * this can be deallocated by simply calling free() 
417
 */
418
AVFrame *avcodec_alloc_frame(void){
419
    AVFrame *pic= av_malloc(sizeof(AVFrame));
420
    
421
    if(pic==NULL) return NULL;
422
    
423
    avcodec_get_frame_defaults(pic);
424
    
425
    return pic;
426
}
427

    
428
int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
429
{
430
    int ret;
431

    
432
    if(avctx->codec)
433
        return -1;
434

    
435
    avctx->codec = codec;
436
    avctx->codec_id = codec->id;
437
    avctx->frame_number = 0;
438
    if (codec->priv_data_size > 0) {
439
        avctx->priv_data = av_mallocz(codec->priv_data_size);
440
        if (!avctx->priv_data) 
441
            return -ENOMEM;
442
    } else {
443
        avctx->priv_data = NULL;
444
    }
445
    ret = avctx->codec->init(avctx);
446
    if (ret < 0) {
447
        av_freep(&avctx->priv_data);
448
        return ret;
449
    }
450
    return 0;
451
}
452

    
453
int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size, 
454
                         const short *samples)
455
{
456
    int ret;
457

    
458
    ret = avctx->codec->encode(avctx, buf, buf_size, (void *)samples);
459
    avctx->frame_number++;
460
    return ret;
461
}
462

    
463
int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size, 
464
                         const AVFrame *pict)
465
{
466
    int ret;
467

    
468
    ret = avctx->codec->encode(avctx, buf, buf_size, (void *)pict);
469
    
470
    emms_c(); //needed to avoid a emms_c() call before every return;
471

    
472
    avctx->frame_number++;
473
    return ret;
474
}
475

    
476
/** 
477
 * decode a frame. 
478
 * @param buf bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE larger then the actual read bytes
479
 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
480
 * @param buf_size the size of the buffer in bytes
481
 * @param got_picture_ptr zero if no frame could be decompressed, Otherwise, it is non zero
482
 * @return -1 if error, otherwise return the number of
483
 * bytes used. 
484
 */
485
int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture, 
486
                         int *got_picture_ptr,
487
                         uint8_t *buf, int buf_size)
488
{
489
    int ret;
490
    
491
    *got_picture_ptr= 0;
492
    ret = avctx->codec->decode(avctx, picture, got_picture_ptr, 
493
                               buf, buf_size);
494

    
495
    emms_c(); //needed to avoid a emms_c() call before every return;
496
    
497
    if (*got_picture_ptr)                           
498
        avctx->frame_number++;
499
    return ret;
500
}
501

    
502
/* decode an audio frame. return -1 if error, otherwise return the
503
   *number of bytes used. If no frame could be decompressed,
504
   *frame_size_ptr is zero. Otherwise, it is the decompressed frame
505
   *size in BYTES. */
506
int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples, 
507
                         int *frame_size_ptr,
508
                         uint8_t *buf, int buf_size)
509
{
510
    int ret;
511

    
512
    *frame_size_ptr= 0;
513
    ret = avctx->codec->decode(avctx, samples, frame_size_ptr, 
514
                               buf, buf_size);
515
    avctx->frame_number++;
516
    return ret;
517
}
518

    
519
int avcodec_close(AVCodecContext *avctx)
520
{
521
    if (avctx->codec->close)
522
        avctx->codec->close(avctx);
523
    avcodec_default_free_buffers(avctx);
524
    av_freep(&avctx->priv_data);
525
    avctx->codec = NULL;
526
    return 0;
527
}
528

    
529
AVCodec *avcodec_find_encoder(enum CodecID id)
530
{
531
    AVCodec *p;
532
    p = first_avcodec;
533
    while (p) {
534
        if (p->encode != NULL && p->id == id)
535
            return p;
536
        p = p->next;
537
    }
538
    return NULL;
539
}
540

    
541
AVCodec *avcodec_find_encoder_by_name(const char *name)
542
{
543
    AVCodec *p;
544
    p = first_avcodec;
545
    while (p) {
546
        if (p->encode != NULL && strcmp(name,p->name) == 0)
547
            return p;
548
        p = p->next;
549
    }
550
    return NULL;
551
}
552

    
553
AVCodec *avcodec_find_decoder(enum CodecID id)
554
{
555
    AVCodec *p;
556
    p = first_avcodec;
557
    while (p) {
558
        if (p->decode != NULL && p->id == id)
559
            return p;
560
        p = p->next;
561
    }
562
    return NULL;
563
}
564

    
565
AVCodec *avcodec_find_decoder_by_name(const char *name)
566
{
567
    AVCodec *p;
568
    p = first_avcodec;
569
    while (p) {
570
        if (p->decode != NULL && strcmp(name,p->name) == 0)
571
            return p;
572
        p = p->next;
573
    }
574
    return NULL;
575
}
576

    
577
static AVCodec *avcodec_find(enum CodecID id)
578
{
579
    AVCodec *p;
580
    p = first_avcodec;
581
    while (p) {
582
        if (p->id == id)
583
            return p;
584
        p = p->next;
585
    }
586
    return NULL;
587
}
588

    
589
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
590
{
591
    const char *codec_name;
592
    AVCodec *p;
593
    char buf1[32];
594
    char channels_str[100];
595
    int bitrate;
596

    
597
    if (encode)
598
        p = avcodec_find_encoder(enc->codec_id);
599
    else
600
        p = avcodec_find_decoder(enc->codec_id);
601

    
602
    if (p) {
603
        codec_name = p->name;
604
        if (!encode && enc->codec_id == CODEC_ID_MP3) {
605
            if (enc->sub_id == 2)
606
                codec_name = "mp2";
607
            else if (enc->sub_id == 1)
608
                codec_name = "mp1";
609
        }
610
    } else if (enc->codec_id == CODEC_ID_MPEG2TS) {
611
        /* fake mpeg2 transport stream codec (currently not
612
           registered) */
613
        codec_name = "mpeg2ts";
614
    } else if (enc->codec_name[0] != '\0') {
615
        codec_name = enc->codec_name;
616
    } else {
617
        /* output avi tags */
618
        if (enc->codec_type == CODEC_TYPE_VIDEO) {
619
            snprintf(buf1, sizeof(buf1), "%c%c%c%c", 
620
                     enc->codec_tag & 0xff,
621
                     (enc->codec_tag >> 8) & 0xff,
622
                     (enc->codec_tag >> 16) & 0xff,
623
                     (enc->codec_tag >> 24) & 0xff);
624
        } else {
625
            snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
626
        }
627
        codec_name = buf1;
628
    }
629

    
630
    switch(enc->codec_type) {
631
    case CODEC_TYPE_VIDEO:
632
        snprintf(buf, buf_size,
633
                 "Video: %s%s",
634
                 codec_name, enc->mb_decision ? " (hq)" : "");
635
        if (enc->codec_id == CODEC_ID_RAWVIDEO) {
636
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
637
                     ", %s",
638
                     avcodec_get_pix_fmt_name(enc->pix_fmt));
639
        }
640
        if (enc->width) {
641
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
642
                     ", %dx%d, %0.2f fps",
643
                     enc->width, enc->height, 
644
                     (float)enc->frame_rate / enc->frame_rate_base);
645
        }
646
        if (encode) {
647
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
648
                     ", q=%d-%d", enc->qmin, enc->qmax);
649
        }
650
        bitrate = enc->bit_rate;
651
        break;
652
    case CODEC_TYPE_AUDIO:
653
        snprintf(buf, buf_size,
654
                 "Audio: %s",
655
                 codec_name);
656
        switch (enc->channels) {
657
            case 1:
658
                strcpy(channels_str, "mono");
659
                break;
660
            case 2:
661
                strcpy(channels_str, "stereo");
662
                break;
663
            case 6:
664
                strcpy(channels_str, "5:1");
665
                break;
666
            default:
667
                sprintf(channels_str, "%d channels", enc->channels);
668
                break;
669
        }
670
        if (enc->sample_rate) {
671
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
672
                     ", %d Hz, %s",
673
                     enc->sample_rate,
674
                     channels_str);
675
        }
676
        
677
        /* for PCM codecs, compute bitrate directly */
678
        switch(enc->codec_id) {
679
        case CODEC_ID_PCM_S16LE:
680
        case CODEC_ID_PCM_S16BE:
681
        case CODEC_ID_PCM_U16LE:
682
        case CODEC_ID_PCM_U16BE:
683
            bitrate = enc->sample_rate * enc->channels * 16;
684
            break;
685
        case CODEC_ID_PCM_S8:
686
        case CODEC_ID_PCM_U8:
687
        case CODEC_ID_PCM_ALAW:
688
        case CODEC_ID_PCM_MULAW:
689
            bitrate = enc->sample_rate * enc->channels * 8;
690
            break;
691
        default:
692
            bitrate = enc->bit_rate;
693
            break;
694
        }
695
        break;
696
    case CODEC_TYPE_DATA:
697
        snprintf(buf, buf_size, "Data: %s", codec_name);
698
        bitrate = enc->bit_rate;
699
        break;
700
    default:
701
        av_abort();
702
    }
703
    if (encode) {
704
        if (enc->flags & CODEC_FLAG_PASS1)
705
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
706
                     ", pass 1");
707
        if (enc->flags & CODEC_FLAG_PASS2)
708
            snprintf(buf + strlen(buf), buf_size - strlen(buf),
709
                     ", pass 2");
710
    }
711
    if (bitrate != 0) {
712
        snprintf(buf + strlen(buf), buf_size - strlen(buf), 
713
                 ", %d kb/s", bitrate / 1000);
714
    }
715
}
716

    
717
unsigned avcodec_version( void )
718
{
719
  return LIBAVCODEC_VERSION_INT;
720
}
721

    
722
unsigned avcodec_build( void )
723
{
724
  return LIBAVCODEC_BUILD;
725
}
726

    
727
/* must be called before any other functions */
728
void avcodec_init(void)
729
{
730
    static int inited = 0;
731

    
732
    if (inited != 0)
733
        return;
734
    inited = 1;
735

    
736
    dsputil_static_init();
737
}
738

    
739
/**
740
 * Flush buffers, should be called when seeking or when swicthing to a different stream.
741
 */
742
void avcodec_flush_buffers(AVCodecContext *avctx)
743
{
744
    if(avctx->codec->flush)
745
        avctx->codec->flush(avctx);
746
}
747

    
748
static void avcodec_default_free_buffers(AVCodecContext *s){
749
    int i, j;
750

    
751
    if(s->internal_buffer==NULL) return;
752
    
753
    for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
754
        InternalBuffer *buf= &((InternalBuffer*)s->internal_buffer)[i];
755
        for(j=0; j<4; j++){
756
            av_freep(&buf->base[j]);
757
            buf->data[j]= NULL;
758
        }
759
    }
760
    av_freep(&s->internal_buffer);
761
    
762
    s->internal_buffer_count=0;
763
}
764

    
765
char av_get_pict_type_char(int pict_type){
766
    switch(pict_type){
767
    case I_TYPE: return 'I'; 
768
    case P_TYPE: return 'P'; 
769
    case B_TYPE: return 'B'; 
770
    case S_TYPE: return 'S'; 
771
    case SI_TYPE:return 'i'; 
772
    case SP_TYPE:return 'p'; 
773
    default:     return '?';
774
    }
775
}
776

    
777
int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
778
    int exact=1, sign=0;
779
    int64_t gcd;
780

    
781
    assert(den != 0);
782

    
783
    if(den < 0)
784
        return av_reduce(dst_nom, dst_den, -nom, -den, max);
785
    
786
    sign= nom < 0;
787
    nom= ABS(nom);
788
    
789
    gcd = ff_gcd(nom, den);
790
    nom /= gcd;
791
    den /= gcd;
792
    
793
    if(nom > max || den > max){
794
        AVRational a0={0,1}, a1={1,0};
795
        exact=0;
796

    
797
        for(;;){
798
            int64_t x= nom / den;
799
            int64_t a2n= x*a1.num + a0.num;
800
            int64_t a2d= x*a1.den + a0.den;
801

    
802
            if(a2n > max || a2d > max) break;
803

    
804
            nom %= den;
805
        
806
            a0= a1;
807
            a1= (AVRational){a2n, a2d};
808
            if(nom==0) break;
809
            x= nom; nom=den; den=x;
810
        }
811
        nom= a1.num;
812
        den= a1.den;
813
    }
814
    
815
    assert(ff_gcd(nom, den) == 1);
816
    
817
    *dst_nom = sign ? -nom : nom;
818
    *dst_den = den;
819
    
820
    return exact;
821
}
822

    
823
int64_t av_rescale(int64_t a, int64_t b, int64_t c){
824
    AVInteger ai, ci;
825
    assert(c > 0);
826
    assert(b >=0);
827
    
828
    if(a<0) return -av_rescale(-a, b, c);
829
    
830
    if(b<=INT_MAX && c<=INT_MAX){
831
        if(a<=INT_MAX)
832
            return (a * b + c/2)/c;
833
        else
834
            return a/c*b + (a%c*b + c/2)/c;
835
    }
836
    
837
    ai= av_mul_i(av_int2i(a), av_int2i(b));
838
    ci= av_int2i(c);
839
    ai= av_add_i(ai, av_shr_i(ci,1));
840
    
841
    return av_i2int(av_div_i(ai, ci));
842
}
843

    
844
/* av_log API */
845

    
846
static int av_log_level = AV_LOG_DEBUG;
847

    
848
static void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl)
849
{
850
    static int print_prefix=1;
851
    AVClass* avc= ptr ? *(AVClass**)ptr : NULL;
852
    if(level>av_log_level)
853
        return;
854
#undef fprintf
855
    if(print_prefix && avc) {
856
            fprintf(stderr, "[%s @ %p]", avc->item_name(ptr), avc);
857
    }
858
#define fprintf please_use_av_log
859
        
860
    print_prefix= strstr(fmt, "\n") != NULL;
861
        
862
    vfprintf(stderr, fmt, vl);
863
}
864

    
865
static void (*av_log_callback)(void*, int, const char*, va_list) = av_log_default_callback;
866

    
867
void av_log(void* avcl, int level, const char *fmt, ...)
868
{
869
    va_list vl;
870
    va_start(vl, fmt);
871
    av_vlog(avcl, level, fmt, vl);
872
    va_end(vl);
873
}
874

    
875
void av_vlog(void* avcl, int level, const char *fmt, va_list vl)
876
{
877
    av_log_callback(avcl, level, fmt, vl);
878
}
879

    
880
int av_log_get_level(void)
881
{
882
    return av_log_level;
883
}
884

    
885
void av_log_set_level(int level)
886
{
887
    av_log_level = level;
888
}
889

    
890
void av_log_set_callback(void (*callback)(void*, int, const char*, va_list))
891
{
892
    av_log_callback = callback;
893
}
894

    
895
#if !defined(HAVE_PTHREADS) && !defined(HAVE_W32THREADS)
896
int avcodec_thread_init(AVCodecContext *s, int thread_count){
897
    return -1;
898
}
899
#endif