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