001/* A simple application that demonstrates the use of SoundPlayback
002 by performing simple additive synthesis in real-time.
003
004 Copyright (c) 2000-2014 The Regents of the University of California.
005 All rights reserved.
006 Permission is hereby granted, without written agreement and without
007 license or royalty fees, to use, copy, modify, and distribute this
008 software and its documentation for any purpose, provided that the above
009 copyright notice and the following two paragraphs appear in all copies
010 of this software.
011
012 IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
013 FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
014 ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
015 THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
016 SUCH DAMAGE.
017
018 THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
019 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
020 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
021 PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
022 CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
023 ENHANCEMENTS, OR MODIFICATIONS.
024
025 PT_COPYRIGHT_VERSION_2
026 COPYRIGHTENDKEY
027
028 */
029package ptolemy.media.javasound.demo.Sines;
030
031import ptolemy.media.javasound.SoundPlayback;
032
033////////////////////////////////////////////////////
034
035/** A simple application that demonstrates the use of SoundPlayback.
036 This application synthesizes and plays a simple harmonic
037 signal, using simple additive synthesis. The signal
038 is the some of a few harmonically related sinusoids.
039 @author Brian K. Vogel
040 @version $Id$
041 @since Ptolemy II 1.0
042 @Pt.ProposedRating Red (vogel)
043 @Pt.AcceptedRating Red (vogel)
044 */
045public class Sines {
046    /** Synthesize and play a simple harmonic signal using additive synthesis.
047     *  @param args Not used.
048     */
049    public static void main(String[] args) {
050        // The pitch of the signal to synthesize.
051        double fundamental_Hz = 220;
052
053        float sampleRate = 44100; // in Hz
054        int sampleSizeInBits = 16;
055        int channels = 2; // stereo.
056        int outBufferSize = 4096; // Internal buffer size for playback.
057
058        // Amount of data to read or write from/to the internal buffer
059        // at a time. This should be set smaller than the internal buffer
060        // size!
061        int putSamplesSize = 25;
062
063        // Construct a sound playback object that plays audio
064        //through the computer's speaker.
065        SoundPlayback soundPlayback = new SoundPlayback(sampleRate,
066                sampleSizeInBits, channels, outBufferSize, putSamplesSize);
067
068        // Initialize and begin playback.
069        try {
070            soundPlayback.startPlayback();
071        } catch (Exception ex) {
072            System.err.println(ex);
073        }
074
075        double[][] samplesArray = new double[channels][putSamplesSize];
076
077        // keep track of time, used in calculating the sine wave values.
078        double[] samples = new double[channels];
079
080        try {
081            // Loop forever.
082            while (true) {
083                for (int j = 0; j < channels; j++) {
084                    for (int i = 0; i < putSamplesSize; i++) {
085                        // Generate a harmonic signal.
086                        samplesArray[j][i] = java.lang.Math.sin(fundamental_Hz
087                                * 2 * java.lang.Math.PI * samples[j]) * 0.4
088                                + java.lang.Math.sin(2 * fundamental_Hz * 2
089                                        * java.lang.Math.PI * samples[j]) * 0.3
090                                + java.lang.Math.sin(3 * fundamental_Hz * 2
091                                        * java.lang.Math.PI * samples[j]) * 0.25
092                                + java.lang.Math.sin(4 * fundamental_Hz * 2
093                                        * java.lang.Math.PI * samples[j]) * 0.2;
094
095                        // Increment time.
096                        samples[j] = samples[j] + 1.0 / sampleRate;
097                    }
098                }
099
100                // Play the processed audio samples.
101                soundPlayback.putSamples(samplesArray);
102            }
103        } catch (Exception ex) {
104            System.err.println(ex);
105        }
106    }
107}