Songdb java version, source. only 1.5 compatible

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7101 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 62 insertions, 0 deletions

diff --git a/songdbj/de/jarnbjo/util/audio/FadeableAudioInputStream.java b/songdbj/de/jarnbjo/util/audio/FadeableAudioInputStream.java
new file mode 100644
index 0000000..4916102
--- /dev/null
+++ b/songdbj/de/jarnbjo/util/audio/FadeableAudioInputStream.java
@@ -0,0 +1,62 @@
+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;
+   }
+
+}
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