work in progress

src/sample/ConversionUtils.java

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+package sample;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.ShortBuffer;
+
+import sample.complex.ComplexBuffer;
+import sample.real.RealBuffer;
+
+/**
+ * Utilities for converting to/from signed 16-bit sample byte arrays and float buffers
+ */
+public class ConversionUtils
+{
+    public static float[] convertFromSigned16BitSamples( byte[] bytes )
+    {
+    	return convertFromSigned16BitSamples( ByteBuffer.wrap( bytes ) );
+    }
+
+    /**
+     * Converts the byte buffer containing 16-bit samples into a float array
+     */
+    public static float[] convertFromSigned16BitSamples( ByteBuffer buffer )
+    {
+    	ShortBuffer byteBuffer = 
+    			buffer.order( ByteOrder.LITTLE_ENDIAN ).asShortBuffer();
+    	
+    	float[] samples = new float[ buffer.limit() / 2 ];
+    	
+    	for( int x = 0; x < samples.length; x++ )
+    	{
+    		samples[ x ] = (float)byteBuffer.get() / 32767.0f;
+    	}
+
+    	return samples;
+    }
+
+    /**
+     * Converts the float samples into a little-endian 16-bit sample byte buffer.
+     * @param samples - float array of sample data
+     * @return - little-endian 16-bit sample byte buffer
+     */
+    public static ByteBuffer convertToSigned16BitSamples( float[] samples )
+    {
+		ByteBuffer converted = ByteBuffer.allocate( samples.length * 2 );
+		converted.order( ByteOrder.LITTLE_ENDIAN );
+
+		for( float sample: samples )
+		{
+			converted.putShort( (short)( sample * Short.MAX_VALUE ) );
+		}
+		
+		return converted;
+    }
+    
+	/**
+	 * Converts the float samples in a complex buffer to a little endian 16-bit
+	 * buffer
+	 */
+	public static ByteBuffer convertToSigned16BitSamples( ComplexBuffer buffer )
+	{
+		return convertToSigned16BitSamples( buffer.getSamples() );
+	}
+
+	/**
+	 * Converts the float samples in a complex buffer to a little endian 16-bit
+	 * buffer
+	 */
+	public static ByteBuffer convertToSigned16BitSamples( RealBuffer buffer )
+	{
+		return convertToSigned16BitSamples( buffer.getSamples() );
+	}
+}