comparison audio/java/AudioSink.java @ 0:672052bd81f8

Initial partial import.

+/*
+ *	AudioSink.java
+ *
+ *	Copyright (c) 2000, Samer Abdallah, King's College London.
+ *	All rights reserved.
+ *
+ *	This software is provided AS iS and WITHOUT ANY WARRANTY;
+ *	without even the implied warranty of MERCHANTABILITY or
+ *	FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+package samer.audio.alt;
+import  javax.sound.sampled.AudioFormat;
+
+/**
+	General interface for objects that accept a stream of
+	samples.
+*/
+
+public abstract class AudioSink
+{
+	AudioFormat format;
+	double		scale;
+
+	public AudioSink(AudioFormat f) { format=f; }
+	public AudioFormat getFormat() { return format; }
+
+	public double getScale() { return scale; }
+	public void   setScale(double s) { scale=s; }
+
+	public abstract void dispose();
+	public abstract void start();
+	public abstract void stop();
+	public abstract int  bwrite(byte [] bbuf, int offs, int len) throws Exception;
+
+	/** Return a task which takes samples from the given buffer
+	 *  The idea is that the audio sink can choose the right
+	 *  kind of writer depending on the format of the audio stream,
+	 *  and then handle any conversions automatically.
+	 *  Should return the number of samples NOT written.
+	 */
+
+	public Writer writer(int len) { 
+		return new Writer(len,format.getSampleSizeInBits()/8); 
+	}
+
+	public class Writer {
+		byte[]  	bbuf;
+		int		bps;
+		Converter conv;
+
+		public Writer(int len, int bps) {
+			this.bps=bps;
+			bbuf=new byte[len*bps];
+			conv=getConverter(bbuf,bps);
+		}
+
+		public int write(double dbuf[]) throws Exception { return write(dbuf,0,dbuf.length); }
+		public int write(double dbuf[], int off, int len) throws Exception {
+			conv.convert(dbuf,off,len);
+			int rem=len*bps, pos=0;
+			while (rem>0) {
+				int count = bwrite(bbuf, pos, rem);
+				if (count<=0) { return rem; }
+				rem -= count; pos += count;
+			}
+			return 0;
+		}
+	}
+
+	private interface Converter { public void convert(double [] dbuf, int offset, int count); }
+	private Converter getConverter(final byte [] b,final int bps) {
+		switch (bps) {
+			case 1: return new Converter() { public void convert(double[] d,int i, int n) { Util.doubleToByte(d,b,i,n,scale); } };
+			case 2: return new Converter() { public void convert(double[] d,int i, int n) { Util.doubleToShort(d,b,i,n,scale); } };
+			case 3: return new Converter() { public void convert(double[] d,int i, int n) { Util.doubleToMedium(d,b,i,n,scale); } };
+			case 4: return new Converter() { public void convert(double[] d,int i, int n) { Util.doubleToInt(d,b,i,n,scale); } };
+		}
+		throw new Error("Unrecognised sample format");
+	}
+
+	protected static void print(String msg) { System.out.println(msg); }
+}
+