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/*
* This checks for the VBR Header defined by Xing(tm)
*/
#include "mpg123.h"
static unsigned long get32bits(unsigned char *buf) {
unsigned long ret = 0;
ret = (((unsigned long) buf[0]) << 24) |
(((unsigned long) buf[1]) << 16) |
(((unsigned long) buf[2]) << 8) |
((unsigned long) buf[3]) ;
return ret;
}
int getVBRHeader(struct vbrHeader *head,unsigned char *buf, struct frame *fr)
{
int ssize;
if(fr->lay != 3)
return 0;
if(fr->lsf)
ssize = (fr->stereo == 1) ? 9 : 17;
else
ssize = (fr->stereo == 1) ? 17 : 32;
buf += ssize;
if(( buf[0] != 'X' ) || ( buf[1] != 'i' ) ||
( buf[2] != 'n' ) || ( buf[3] != 'g' ) )
return 0;
buf+=4;
head->flags = get32bits(buf);
buf+=4;
if(head->flags & VBR_FRAMES_FLAG) {
head->frames = get32bits(buf);
buf += 4;
}
if(head->flags & VBR_BYTES_FLAG) {
head->bytes = get32bits(buf);
buf += 4;
}
if(head->flags & VBR_TOC_FLAG) {
memcpy(head->toc,buf,100);
buf += 100;
}
if(head->flags & VBR_SCALE_FLAG) {
head->scale = get32bits(buf);
buf += 4;
}
fprintf(stderr,"Found XING %04lx\n",head->flags);
return 1;
}
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