PlaySine.java

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package com.portaudio;
 
import com.portaudio.TestBasic.SineOscillator;
 
public class PlaySine
{
        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;
                }
        }
 
        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();
        }
}