package de.jarnbjo.util.audio; import java.io.*; import javax.sound.sampled.*; public class FadeableAudioInputStream extends AudioInputStream { private AudioInputStream stream; private boolean fading=false; private double phi=0.0; public FadeableAudioInputStream(AudioInputStream stream) throws IOException { super(stream, stream.getFormat(), -1L); } public void fadeOut() { fading=true; phi=0.0; } public int read(byte[] b) throws IOException { return read(b, 0, b.length); } public int read(byte[] b, int offset, int length) throws IOException { int read=super.read(b, offset, length); //System.out.println("read "+read); if(fading) { int j=0, l=0, r=0; double gain=0.0; for(int i=offset; i<offset+read; i+=4) { j=i; l=((int)b[j++])&0xff; l|=((int)b[j++])<<8; r=((int)b[j++])&0xff; r|=((int)b[j])<<8; if(phi<Math.PI/2) { phi+=0.000015; } gain=Math.cos(phi); //System.out.println("gain "+gain); l=(int)(l*gain); r=(int)(r*gain); j=i; b[j++]=(byte)(l&0xff); b[j++]=(byte)((l>>8)&0xff); b[j++]=(byte)(r&0xff); b[j++]=(byte)((r>>8)&0xff); } } return read; } }