Sines.java example

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ptii-master
/* A simple application that demonstrates the use of SoundPlayback
 by performing simple additive synthesis in real-time.

 Copyright (c) 2000-2005 The Regents of the University of California.
 All rights reserved.
 Permission is hereby granted, without written agreement and without
 license or royalty fees, to use, copy, modify, and distribute this
 software and its documentation for any purpose, provided that the above
 copyright notice and the following two paragraphs appear in all copies
 of this software.

 IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
 FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
 THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
 SUCH DAMAGE.

 THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
 PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
 CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
 ENHANCEMENTS, OR MODIFICATIONS.

 PT_COPYRIGHT_VERSION_2
 COPYRIGHTENDKEY

 */
package ptolemy.media.javasound.demo.Sines;

import ptolemy.media.javasound.SoundPlayback;

////////////////////////////////////////////////////

/** A simple application that demonstrates the use of SoundPlayback.
 This application synthesizes and plays a simple harmonic
 signal, using simple additive synthesis. The signal
 is the some of a few harmonically related sinusoids.
 @author Brian K. Vogel
 @version $Id$
 @since Ptolemy II 1.0
 @Pt.ProposedRating Red (vogel)
 @Pt.AcceptedRating Red (vogel)
 */
public class Sines {
    public static void main(String[] args) {
        // The pitch of the signal to synthesize.
        double fundamental_Hz = 220;

        float sampleRate = 44100; // in Hz
        int sampleSizeInBits = 16;
        int channels = 2; // stereo.
        int outBufferSize = 4096; // Internal buffer size for playback.

        // Amount of data to read or write from/to the internal buffer
        // at a time. This should be set smaller than the internal buffer
        // size!
        int putSamplesSize = 25;

        // Construct a sound playback object that plays audio
        //through the computer's speaker.
        SoundPlayback soundPlayback = new SoundPlayback(sampleRate,
                sampleSizeInBits, channels, outBufferSize, putSamplesSize);

        // Initialize and begin playback.
        try {
            soundPlayback.startPlayback();
        } catch (Exception ex) {
            System.err.println(ex);
        }

        double[][] samplesArray = new double[channels][putSamplesSize];

        // keep track of time, used in calculating the sine wave values.
        double[] samples = new double[channels];

        try {
            // Loop forever.
            while (true) {
                for (int j = 0; j < channels; j++) {
                    for (int i = 0; i < putSamplesSize; i++) {
                        // Generate a harmonic signal.
                        samplesArray[j][i] = (java.lang.Math.sin(fundamental_Hz
                                * 2 * java.lang.Math.PI * samples[j]) * 0.4)
                                + (java.lang.Math.sin(2 * fundamental_Hz * 2
                                        * java.lang.Math.PI * samples[j]) * 0.3)
                                + (java.lang.Math.sin(3 * fundamental_Hz * 2
                                        * java.lang.Math.PI * samples[j]) * 0.25)
                                + (java.lang.Math.sin(4 * fundamental_Hz * 2
                                        * java.lang.Math.PI * samples[j]) * 0.2);

                        // Increment time.
                        samples[j] = samples[j] + (1.0 / sampleRate);
                    }
                }

                // Play the processed audio samples.
                soundPlayback.putSamples(samplesArray);
            }
        } catch (Exception ex) {
            System.err.println(ex);
        }
    }
}