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