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/* MPEG/WAVE Sound library
(C) 1997 by Jung woo-jae */
// Bitwindow.cc
// It's bit reservior for MPEG layer 3
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "MPEGaudio.h"
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
#define _KEY 0
#else
#define _KEY 3
#endif
int Mpegbitwindow::getbits(int bits)
{
union
{
char store[4];
int current;
}u;
int bi;
if(!bits)return 0;
u.current=0;
bi=(bitindex&7);
// u.store[_KEY]=buffer[(bitindex>>3)&(WINDOWSIZE-1)]<<bi;
u.store[_KEY]=buffer[bitindex>>3]<<bi;
bi=8-bi;
bitindex+=bi;
while(bits)
{
if(!bi)
{
// u.store[_KEY]=buffer[(bitindex>>3)&(WINDOWSIZE-1)];
u.store[_KEY]=buffer[bitindex>>3];
bitindex+=8;
bi=8;
}
if(bits>=bi)
{
u.current<<=bi;
bits-=bi;
bi=0;
}
else
{
u.current<<=bits;
bi-=bits;
bits=0;
}
}
bitindex-=bi;
return (u.current>>8);
}
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