Add example of calling JPortAudio.

diff --git a/bindings/java/jportaudio/jtests/com/portaudio/PlaySine.java b/bindings/java/jportaudio/jtests/com/portaudio/PlaySine.java
new file mode 100644 (file)
index 0000000..ec2cb97
--- /dev/null
+++ b/bindings/java/jportaudio/jtests/com/portaudio/PlaySine.java
@@ -0,0 +1,89 @@
+
+/** @file
+ @ingroup bindings_java
+
+ @brief Example that shows how to play sine waves using JPortAudio.
+*/
+package com.portaudio;
+
+import com.portaudio.TestBasic.SineOscillator;
+
+public class PlaySine
+{
+       /**
+        * Write a sine wave to the stream.
+        * @param stream
+        * @param framesPerBuffer
+        * @param numFrames
+        * @param sampleRate
+        */
+       private void writeSineData( BlockingStream stream, int framesPerBuffer,
+                       int numFrames, int sampleRate )
+       {
+               float[] buffer = new float[framesPerBuffer * 2];
+               SineOscillator osc1 = new SineOscillator( 200.0, sampleRate );
+               SineOscillator osc2 = new SineOscillator( 300.0, sampleRate );
+               int framesLeft = numFrames;
+               while( framesLeft > 0 )
+               {
+                       int index = 0;
+                       int framesToWrite = (framesLeft > framesPerBuffer) ? framesPerBuffer
+                                       : framesLeft;
+                       for( int j = 0; j < framesToWrite; j++ )
+                       {
+                               buffer[index++] = (float) osc1.next();
+                               buffer[index++] = (float) osc2.next();
+                       }
+                       stream.write( buffer, framesToWrite );
+                       framesLeft -= framesToWrite;
+               }
+       }
+
+       /**
+        * Create a stream on the default device then play sine waves.
+        */
+       public void play()
+       {
+               PortAudio.initialize();
+
+               // Get the default device and setup the stream parameters.
+               int deviceId = PortAudio.getDefaultOutputDevice();
+               DeviceInfo deviceInfo = PortAudio.getDeviceInfo( deviceId );
+               double sampleRate = deviceInfo.defaultSampleRate;
+               System.out.println( "  deviceId    = " + deviceId );
+               System.out.println( "  sampleRate  = " + sampleRate );
+               System.out.println( "  device name = " + deviceInfo.name );
+
+               StreamParameters streamParameters = new StreamParameters();
+               streamParameters.channelCount = 2;
+               streamParameters.device = deviceId;
+               streamParameters.suggestedLatency = deviceInfo.defaultLowOutputLatency;
+               System.out.println( "  suggestedLatency = "
+                               + streamParameters.suggestedLatency );
+
+               int framesPerBuffer = 256;
+               int flags = 0;
+               
+               // Open a stream for output.
+               BlockingStream stream = PortAudio.openStream( null, streamParameters,
+                               (int) sampleRate, framesPerBuffer, flags );
+
+               int numFrames = (int) (sampleRate * 4); // enough for 4 seconds
+
+               stream.start();
+
+               writeSineData( stream, framesPerBuffer, numFrames, (int) sampleRate );
+
+               stream.stop();
+               stream.close();
+
+               PortAudio.terminate();
+               System.out.println( "JPortAudio test complete." );
+       }
+
+       public static void main( String[] args )
+       {
+               PlaySine player = new PlaySine();
+               player.play();
+       }
+}