samer@0: /*
samer@0:  *	AudioSink.java
samer@0:  *
samer@0:  *	Copyright (c) 2000, Samer Abdallah, King's College London.
samer@0:  *	All rights reserved.
samer@0:  *
samer@0:  *	This software is provided AS iS and WITHOUT ANY WARRANTY;
samer@0:  *	without even the implied warranty of MERCHANTABILITY or
samer@0:  *	FITNESS FOR A PARTICULAR PURPOSE.
samer@0:  */
samer@0: 
samer@0: package samer.audio;
samer@0: import samer.tools.*;
samer@0: 
samer@0: /**
samer@0: 	General interface for objects that accept a stream of
samer@0: 	samples.
samer@0: */
samer@0: 
samer@0: public interface AudioSink
samer@0: {
samer@0: 	boolean isOpen();
samer@0: 	void open() throws Exception;
samer@0: 	void close();
samer@0: 	void dispose();
samer@0: 
samer@0: 	/** Return a task which takes samples from the given buffer
samer@0: 	 *  The idea is that the audio sink can choose the right
samer@0: 	 *  kind of writer depending on the format of the audio stream,
samer@0: 	 *  and then handle any conversions automatically.
samer@0: 	 */
samer@0: 	Task writer(double buf[], int off, int len);
samer@0: 	Task writer(float buf[], int off, int len);
samer@0: 
samer@0: 	public static class Util {
samer@0: 		public static void doubleToShort(double[] src, byte [] dst, int off, int n, double k) {
samer@0: 			k*=32768;
samer@0: 			for (int i=0, j=off; j<n+off; j++) {
samer@0: 		 		int y = (int)(k*src[j]);
samer@0: 				dst[i++] = (byte)(y&0xff);
samer@0: 				dst[i++] = (byte)(y>>8);
samer@0: 			}
samer@0: 		}
samer@0: 
samer@0: 		public static void doubletoByte(double [] src, byte[] dst, int off, int n, double k) {
samer@0: 			k*=128;
samer@0: 			for (int i=0, j=off; j<n+off; j++) {
samer@0: 		 		int y = (int)(k*src[j]) + 128;
samer@0: 				dst[i++] = (byte)(y&0xff);
samer@0: 			}
samer@0: 		}
samer@0: 
samer@0: 		public static void floatToShort(float [] src, byte [] dst, int off, int n, float k) {
samer@0: 			k*=32768;
samer@0: 			for (int i=0, j=off; j<n+off; j++) {
samer@0: 		 		int y = (int)(k*src[j]);
samer@0: 				dst[i++] = (byte)(y&0xff);
samer@0: 				dst[i++] = (byte)(y>>8);
samer@0: 			}
samer@0: 		}
samer@0: 
samer@0: 		public static void floatToByte(float [] src, byte [] dst, int off, int n, float k) {
samer@0: 			k*=128;
samer@0: 			for (int i=0, j=off; j<n+off; j++) {
samer@0: 		 		int y = (int)(128.0*src[j]) + 128;
samer@0: 				dst[i++] = (byte)(y&0xff);
samer@0: 			}
samer@0: 		}
samer@0: 
samer@0: 	}
samer@0: }
samer@0: