Java example source code file (ProgramAndBankChange.java)

This example Java source code file (ProgramAndBankChange.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

audio, audioinputstream, exception, ioexception, midi, midichannel, modeloscillatorstream, modelperformer, patch, programandbankchange, runtimeexception, simpleinstrument, softsynthesizer, sound, voicestatus

The ProgramAndBankChange.java Java example source code

/*
 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/* @test
   @summary Test SoftChannel program and bank change */

import java.io.IOException;

import javax.sound.midi.*;
import javax.sound.sampled.*;

import com.sun.media.sound.*;

public class ProgramAndBankChange {

    private static SimpleInstrument generateTestInstrument(Patch patch) {
        ModelOscillator osc = new ModelOscillator() {
            public float getAttenuation() {
                return 0;
            }

            public int getChannels() {
                return 1;
            }

            public ModelOscillatorStream open(float samplerate) {
                return new ModelOscillatorStream() {
                    public void close() throws IOException {
                    }

                    public void noteOff(int velocity) {
                    }

                    public void noteOn(MidiChannel channel, VoiceStatus voice,
                            int noteNumber, int velocity) {
                    }

                    public int read(float[][] buffer, int offset, int len)
                            throws IOException {
                        return len;
                    }

                    public void setPitch(float ipitch) {
                    }
                };
            }
        };
        ModelPerformer performer = new ModelPerformer();
        performer.getOscillators().add(osc);
        SimpleInstrument testinstrument = new SimpleInstrument();
        testinstrument.setPatch(patch);
        testinstrument.add(performer);
        return testinstrument;
    }

    private static void assertTrue(boolean value) throws Exception {
        if (!value)
            throw new RuntimeException("assertTrue fails!");
    }

    private static void testProgramAndBank(SoftSynthesizer soft,
            AudioInputStream stream, Patch patch) throws Exception {

        int program = patch.getProgram();
        int bank = patch.getBank();

        MidiChannel channel = soft.getChannels()[0];
        byte[] buff = new byte[2048];

        channel.programChange(bank, program);
        channel.noteOn(64, 64);
        stream.read(buff, 0, buff.length);

        int foundprogram = -1;
        int foundbank = -1;
        VoiceStatus[] vstatus = soft.getVoiceStatus();
        for (int i = 0; i < vstatus.length; i++) {
            if (vstatus[i].active) {
                foundprogram = vstatus[i].program;
                foundbank = vstatus[i].bank;
                break;
            }
        }

        assertTrue(foundprogram == program);
        assertTrue(foundbank == bank);

        channel.noteOn(64, 0);
        stream.read(buff, 0, buff.length);

        channel = soft.getChannels()[1];
        // Send MSB Bank
        channel.controlChange(0x00, bank / 128);
        // Send LSB Bank
        channel.controlChange(0x20, bank % 128);
        // Send Program Change
        channel.programChange(program);
        channel.noteOn(64, 64);
        stream.read(buff, 0, buff.length);

        foundprogram = -1;
        foundbank = -1;
        vstatus = soft.getVoiceStatus();
        for (int i = 0; i < vstatus.length; i++) {
            if (vstatus[i].active) {
                foundprogram = vstatus[i].program;
                foundbank = vstatus[i].bank;
                break;
            }
        }
        assertTrue(foundprogram == program);
        assertTrue(foundbank == bank);
        channel.noteOn(64, 0);
        stream.read(buff, 0, buff.length);
    }

    public static void main(String[] args) throws Exception {
        SoftSynthesizer soft = new SoftSynthesizer();
        AudioInputStream stream = soft.openStream(null, null);
        soft.unloadAllInstruments(soft.getDefaultSoundbank());

        soft.loadInstrument(generateTestInstrument(new Patch(0, 0)));
        soft.loadInstrument(generateTestInstrument(new Patch(7, 0)));
        soft.loadInstrument(generateTestInstrument(new Patch(20, 10)));
        soft.loadInstrument(generateTestInstrument(new Patch(3678, 15)));
        soft.loadInstrument(generateTestInstrument(new Patch(4678, 15)));

        testProgramAndBank(soft, stream, new Patch(0, 0));
        testProgramAndBank(soft, stream, new Patch(7, 0));
        testProgramAndBank(soft, stream, new Patch(20, 10));
        testProgramAndBank(soft, stream, new Patch(3678, 15));
        testProgramAndBank(soft, stream, new Patch(4678, 15));

        soft.close();
    }
}