JOAL/OpenAL: Adjust build.xml for gluegen-rt + joal jars; Add com.jsyn.devices.openal.ALDevice for JOAL/OpenAL (todo: input)

Adding ALDevice source code for an JOAL/OpenAL AudioDeviceManager.
Input is currently missing, output working and manually tested for low latency.

AudioDeviceFactory has ALDevice added with priority over JPortAudio.
Not sure how to customize this, but this surely can change if desired.

When adding input later on, 'preferJavaSound'
might not be desired anymore?

Note: To enjoy spatial 3D features w/ OpenAL,
the source must be mono only!

+++

Perhaps attach our java-source-zip files to the gluegen-rt.jar and joal.jar
to have API source documentation:
- https://jogamp.org/deployment/archive/rc/v2.5.0-rc-20230523/jar/gluegen-java-src.zip
- https://jogamp.org/deployment/archive/rc/v2.5.0-rc-20230523/jar/joal-java-src.zip

+++

Note: The added libs/gluegen-rt.jar and libs/joal.jar are java only w/o native libs.
Hence one needs to add a either gluegen and joal native library jar files
or just use the full jogamp-fat.jar.

Used version is v2.5.0-rc-20230523

jogamp-fat.jar (* recommended and used in scripts/tests.sh *)
https://jogamp.org/deployment/archive/rc/v2.5.0-rc-20230523/fat/jogamp-fat.jar

All single jar files
https://jogamp.org/deployment/archive/rc/v2.5.0-rc-20230523/jar/

7z archive file of all single files w/o fat
https://jogamp.org/deployment/archive/rc/v2.5.0-rc-20230523/archive/jogamp-all-platforms.7z

4 files changed, 626 insertions, 1 deletions

diff --git a/build.xml b/build.xml
index 24f2d5a..36dcc7d 100644
--- a/build.xml
+++ b/build.xml
@@ -23,9 +23,12 @@
         description="compile the source " >
     <!-- Compile the java code from ${src} into ${build} -->
     <javac target="${java-version}" source="${java-version}"
-        srcdir="${src.dir}" destdir="${build.dir}">
+        srcdir="${src.dir}" destdir="${build.dir}"
+        debug="${javacdebug}" debuglevel="${javacdebuglevel}">
       <classpath>
         <pathelement path="libs/jportaudio.jar"/>
+        <pathelement path="libs/gluegen-rt.jar"/>
+        <pathelement path="libs/joal.jar"/>
       </classpath>
     </javac>
   </target>
diff --git a/scripts/tests.sh b/scripts/tests.sh
new file mode 100755
index 0000000..9580741
--- /dev/null
+++ b/scripts/tests.sh
@@ -0,0 +1,63 @@
+#!/bin/bash
+
+# set -x
+
+#
+# See https://github.com/kcat/openal-soft/blob/master/docs/env-vars.txt
+# export ALSOFT_LOGLEVEL=3
+#
+
+javaexe=`which java`
+
+rm -f java-run.log
+
+function jrun() {
+    #D_ARGS="-Djogamp.debug=all"
+    #D_ARGS="-Djogamp.debug.Bitstream"
+    #D_ARGS="-Djogamp.debug.NativeLibrary=true -Djoal.debug=true"
+    #D_ARGS="-Djogamp.debug.AudioSink"
+    #D_ARGS="-Djogamp.debug.AudioSink -Djoal.debug.AudioSink.trace"
+    #D_ARGS="-Djoal.debug.AudioSink.trace"
+    #D_ARGS="-Djoal.debug=all"
+    #D_ARGS="-Djogamp.debug.JNILibLoader"
+    #D_ARGS="-Djogamp.debug.NativeLibrary=true -Djogamp.debug.JNILibLoader=true"
+    #X_ARGS="-verbose:jni"
+    #X_ARGS="-Xrs"
+
+    # StartFlightRecording: delay=10s,
+    # FlightRecorderOptions: stackdepth=2048
+    # Enable remote connection to jmc: jcmd <PID> ManagementAgent.start jmxremote.authenticate=false jmxremote.ssl=false jmxremote.port=7091
+    # X_ARGS="-XX:+UnlockDiagnosticVMOptions -XX:+DebugNonSafepoints $X_ARGS"
+    # X_ARGS="-XX:FlightRecorderOptions=stackdepth=2048,threadbuffersize=16k $X_ARGS"
+    # X_ARGS="-XX:StartFlightRecording=delay=10s,dumponexit=true,filename=java-run.jfr $X_ARGS"
+
+    for i in dist/lib/jsyn-????????.jar ; do 
+      jsynjar=$i
+    done
+    for i in dist/lib/jsyn-examples-????????.jar ; do 
+      jsynexamplesjar=$i
+    done
+    echo Using jsyn $jsynjar
+    echo Using jsyn-examples $jsynexamplesjar
+
+    #CLASSPATH=libs/gluegen-rt.jar:libs/joal.jar:$jsynjar:$jsynexamplesjar
+    CLASSPATH=libs/jogamp-fat.jar:$jsynjar:$jsynexamplesjar
+
+    echo
+    echo "Test Start: $*"
+    echo
+    echo "$javaexe" $X_ARGS -cp $CLASSPATH $D_ARGS $C_ARG $*
+    "$javaexe" $X_ARGS -cp $CLASSPATH $D_ARGS $C_ARG $*
+    echo
+    echo "Test End: $*"
+    echo
+}
+
+function testnormal() {
+    jrun $* 2>&1 | tee -a java-run.log
+}
+
+testnormal com.jsyn.apps.AboutJSyn
+#testnormal com.jsyn.examples.PlayNotes
+#testnormal com.jsyn.examples.PlayFunction
+
diff --git a/src/main/java/com/jsyn/devices/AudioDeviceFactory.java b/src/main/java/com/jsyn/devices/AudioDeviceFactory.java
index 612c81d..f4e03d4 100644
--- a/src/main/java/com/jsyn/devices/AudioDeviceFactory.java
+++ b/src/main/java/com/jsyn/devices/AudioDeviceFactory.java
@@ -53,14 +53,32 @@ public class AudioDeviceFactory {
     public static AudioDeviceManager createAudioDeviceManager(boolean preferJavaSound) {
         if (preferJavaSound) {
             tryJavaSound();
+            tryOpenAL();
             tryJPortAudio();
         } else {
+            tryOpenAL();
             tryJPortAudio();
             tryJavaSound();
         }
         return instance;
     }
 
+    private static void tryOpenAL() {
+        if (instance == null) {
+            try {
+                @SuppressWarnings("unchecked")
+                final
+                Class<AudioDeviceManager> clazz = JavaTools.loadClass(
+                        "com.jsyn.devices.openal.ALDevice", true);
+                if (clazz != null) {
+                    instance = clazz.newInstance();
+                }
+            } catch (final Throwable e) {
+                System.err.println("Could not load JOAL/OpenAL device. " + e);
+            }
+        }
+    }
+
     private static void tryJavaSound() {
         if (instance == null) {
             try {
diff --git a/src/main/java/com/jsyn/devices/openal/ALDevice.java b/src/main/java/com/jsyn/devices/openal/ALDevice.java
new file mode 100644
index 0000000..18845f7
--- /dev/null
+++ b/src/main/java/com/jsyn/devices/openal/ALDevice.java
@@ -0,0 +1,541 @@
+/**
+ * Copyright 2013-2023 Gothel Software e.K.
+ * Copyright 2013-2023 JogAmp Community.
+ * Copyright 2009 Phil Burk, Mobileer Inc
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ *    1. Redistributions of source code must retain the above copyright notice, this list of
+ *       conditions and the following disclaimer.
+ *
+ *    2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *       of conditions and the following disclaimer in the documentation and/or other materials
+ *       provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * - AND -
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.jsyn.devices.openal;
+
+import java.nio.ByteBuffer;
+import java.nio.DoubleBuffer;
+import java.util.ArrayList;
+import java.util.List;
+
+import com.jogamp.common.av.AudioFormat;
+import com.jogamp.common.nio.Buffers;
+import com.jogamp.openal.AL;
+import com.jogamp.openal.ALC;
+import com.jogamp.openal.ALCConstants;
+import com.jogamp.openal.ALFactory;
+import com.jogamp.openal.util.ALAudioSink;
+import com.jsyn.devices.AudioDeviceInputStream;
+import com.jsyn.devices.AudioDeviceManager;
+import com.jsyn.devices.AudioDeviceOutputStream;
+
+/**
+ * Use JOAL/OpenAL to access the audio hardware.
+ */
+public class ALDevice implements AudioDeviceManager {
+
+    private static final boolean DEBUG = true;
+    private static final boolean LITTLE_ENDIAN = true;
+    private static final float DEFAULT_LATENCY = 1f/50f; // 50Hz -> 20ms
+
+    @SuppressWarnings("unused")
+    private static final AL al;
+    private static final ALC alc;
+    private static final boolean staticsInitialized;
+
+    private static final List<DeviceInfo> deviceRecords = new ArrayList<DeviceInfo>();
+    private static int defaultInputDeviceID = -1;
+    private static int defaultOutputDeviceID = -1;
+    private static int maxInputChannels = 0;
+    private static int maxOutputChannels = 0;
+
+    static {
+        if( DEBUG ) {
+            System.err.println("ALAudioSink/OpenAL initialization...");
+        }
+        if( ALAudioSink.isInitialized() ) {
+            alc = ALFactory.getALC();
+            al = ALFactory.getAL();
+
+            sniffAvailableMixers();
+            if( DEBUG ) {
+                dumpAvailableMixers();
+            }
+            staticsInitialized = true;
+        } else {
+            alc = null;
+            al = null;
+
+            if( DEBUG ) {
+                System.err.println("ALAudioSink/OpenAL couldn't be initialized");
+            }
+            staticsInitialized = false;
+        }
+    }
+
+    private static class DeviceInfo {
+        String name;
+        boolean isInput;
+        boolean isDefault;
+        int defaultSampleRate; // Hz
+        float latency; // s
+        int outputSourceCount;
+
+        @Override
+        public String toString() {
+            return String.format("AudioDevice: %s, %s, def %b, defSampleRate = %d Hz, latency = %.2f ms, outSourceCount = %d",
+                    name, isInput ? "input" : "output", isDefault, defaultSampleRate, 1000f*latency, outputSourceCount);
+        }
+    }
+
+    private static void dumpAvailableMixers() {
+        for (int i=0; i < deviceRecords.size(); ++i) {
+            final DeviceInfo deviceInfo = deviceRecords.get(i);
+            System.out.printf("%2d: %s%n", i, deviceInfo);
+        }
+    }
+    private static DeviceInfo getDeviceInfo(final int id, final boolean input, final boolean fallBackToDefault) {
+        if( 0 <= id && id < deviceRecords.size() ) {
+            final DeviceInfo di = deviceRecords.get(id);
+            if( di.isInput != input ) {
+                System.err.println("DeviceID "+id+" i/p type mismatch, req input "+input+", but is "+di);
+                return null;
+            }
+            return di;
+        } else if( fallBackToDefault ) {
+            return deviceRecords.get(input ? defaultInputDeviceID : defaultOutputDeviceID);
+        }
+        return null;
+    }
+    private static DeviceInfo getDeviceInfo(final int id) {
+        if( 0 <= id && id < deviceRecords.size() ) {
+            return deviceRecords.get(id);
+        }
+        return null;
+    }
+
+    /**
+     * Build device info and determine default devices.
+     */
+    private static void sniffAvailableMixers() {
+        final String defOutDeviceName = alc.alcGetString(null, ALCConstants.ALC_DEFAULT_DEVICE_SPECIFIER);
+        final String defInDeviceName = alc.alcGetString(null, ALCConstants.ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER);
+        {
+            final String[] outDevices = alc.alcGetDeviceSpecifiers();
+            if( null != outDevices ) {
+                for (int i=0; i < outDevices.length; ++i) {
+                    final DeviceInfo di = new DeviceInfo();
+                    di.name = outDevices[i];
+                    di.isInput = false;
+                    enumDevice(di, alc, defOutDeviceName, defInDeviceName);
+                    deviceRecords.add(di);
+                    if( di.isDefault ) {
+                        defaultOutputDeviceID = i;
+                    }
+                }
+            }
+        }
+        {
+            final String[] inDevices = alc.alcGetCaptureDeviceSpecifiers();
+            if( null != inDevices ) {
+                for (int i=0; i < inDevices.length; ++i) {
+                    final DeviceInfo di = new DeviceInfo();
+                    di.name = inDevices[i];
+                    di.isInput = true;
+                    enumDevice(di, alc, defOutDeviceName, defInDeviceName);
+                    deviceRecords.add(di);
+                    if( di.isDefault ) {
+                        defaultInputDeviceID = i;
+                    }
+                }
+            }
+        }
+        maxInputChannels = 1; // FIXME
+    }
+    private static boolean enumDevice(final DeviceInfo di, final ALC alc, final String defOutDeviceName, final String defInDeviceName) {
+        if( di.isInput ) {
+            di.isDefault = di.name.equals(defInDeviceName);
+            di.defaultSampleRate = 44100; // FIXME
+            di.latency = DEFAULT_LATENCY; // FIXME
+            di.outputSourceCount = 0;
+            return true;
+        } else {
+            final ALAudioSink sink;
+            try {
+                sink = new ALAudioSink(di.name);
+            } catch(final Throwable e) {
+                e.printStackTrace();
+                return false;
+            }
+            final AudioFormat nativeFormat = sink.getNativeFormat();
+            di.isDefault = di.name.equals(defOutDeviceName);
+            di.defaultSampleRate = nativeFormat.sampleRate;
+            di.latency = sink.getDefaultLatency();
+            di.outputSourceCount = sink.getSourceCount();
+
+            if( di.isDefault ) {
+                maxOutputChannels = nativeFormat.channelCount;
+            }
+            sink.destroy();
+            return true;
+        }
+    }
+
+    /** 30ms -> 23kB for 48000, stereo, double64 */
+    private double suggestedOutputLatency = 0.030;
+    /** 100ms -> ~30kB for 48000, mono, double64 */
+    private double suggestedInputLatency = 0.100;
+
+    public ALDevice() {
+        if( !staticsInitialized ) {
+            throw new RuntimeException("ALDevice failed to initialize JOAL/OpenAL subsystem.");
+        }
+    }
+
+    private static class ALStream {
+        DeviceInfo di;
+
+        boolean useDouble64SampleType;
+        int bytesPerSample;
+        AudioFormat format;
+
+        /**
+         * @param deviceID device ID
+         * @param sampleRate sampler per second, e.g. 44100
+         * @param channelCount channel count
+         */
+        public ALStream(final int deviceID, final boolean input, final int sampleRate, final int channelCount) {
+            di = getDeviceInfo(deviceID, input, true);
+            if( null == di ) {
+                throw new IllegalArgumentException("Can't load deviceID "+deviceID);
+            }
+        }
+
+        int calculateBufferSize(final double suggestedOutputLatency) {
+            final int numFrames = (int) (suggestedOutputLatency * format.sampleRate);
+            return numFrames * format.channelCount * bytesPerSample;
+        }
+
+    }
+
+    private static ByteBuffer allocate(final int size) {
+        // return ByteBuffer.allocate(size);
+        return Buffers.newDirectByteBuffer(size);
+    }
+
+    private class ALOutputStream extends ALStream implements AudioDeviceOutputStream {
+        ALAudioSink sink;
+        ByteBuffer sampleBuffer = null;
+
+        /**
+         * @param deviceID device ID
+         * @param sampleRate sampler per second, e.g. 44100
+         * @param channelCount channel count
+         */
+        public ALOutputStream(final int deviceID, final int sampleRate, final int channelCount) {
+            super(deviceID, false, sampleRate, channelCount);
+            if( di.isInput ) {
+                throw new RuntimeException("deviceID "+deviceID+", is not an output device: "+di);
+            }
+            sink = new ALAudioSink(di.name);
+            final AudioFormat d64 = new AudioFormat(sampleRate, 8<<3, channelCount, true /* signed */,
+                                                    false /* fixed point */, false /* planar */, LITTLE_ENDIAN);
+            if( sink.isSupported(d64) ) {
+                useDouble64SampleType = true;
+                bytesPerSample = 8;
+                format = d64;
+            } else {
+                useDouble64SampleType = false;
+                bytesPerSample = 2;
+                format = new AudioFormat(sampleRate, bytesPerSample<<3, channelCount, true /* signed */,
+                                         true /* fixed point */, false /* planar */, LITTLE_ENDIAN);
+            }
+            sampleBuffer = allocate(calculateBufferSize(suggestedOutputLatency));
+            if( DEBUG ) {
+                System.err.println("Created: "+sink);
+            }
+        }
+
+        @Override
+        public void start() {
+            final int frameDuration = 10; // ms, observed 1.45 ms/frame
+            if( !sink.init(format, frameDuration,
+                           10 /* ms initial queue, 1 frame, let write() determine actual frameDuration (size in ms) */,
+                           32 /* ms queue growth */,
+                           32 /* ms queue limit */) )
+            {
+                // FIXME: jsyn API may allow to simply return false?
+                throw new RuntimeException("Couldn't initialize ALAudioSink w/ format "+format+", frameDuration "+frameDuration+": "+sink);
+            }
+            sink.play();
+            if( DEBUG ) {
+                System.err.println("Start: "+sink);
+            }
+        }
+
+        final double[] oneDouble = { 0 };
+
+        @Override
+        public void write(final double value) {
+            oneDouble[0] = value;
+            write(oneDouble, 0, 1);
+        }
+
+        @Override
+        public void write(final double[] buffer) {
+            write(buffer, 0, buffer.length);
+        }
+
+        @Override
+        public void write(final double[] buffer, final int start, final int sample_count) {
+            if( sampleBuffer.capacity() < bytesPerSample*sample_count ) {
+                if( DEBUG ) {
+                    System.err.printf("SampleBuffer grow: %d -> %d%n", sampleBuffer.capacity(), bytesPerSample*sample_count);
+                }
+                sampleBuffer = allocate(bytesPerSample*sample_count);
+            }
+
+            if( useDouble64SampleType ) {
+                final DoubleBuffer d64sb = sampleBuffer.asDoubleBuffer();
+                for(int i=0; i<sample_count; ++i) {
+                    d64sb.put( buffer[i + start] );
+                }
+            } else {
+                for(int i=0; i<sample_count; ++i) {
+                    // Offset before casting so that we can avoid using floor().
+                    // Also round by adding 0.5 so that very small signals go to zero.
+                    final double temp = (32767.0 * buffer[i + start]) + 32768.5;
+                    int s16 = ((int) temp) - 32768;
+                    if (s16 > Short.MAX_VALUE) {
+                        s16 = Short.MAX_VALUE;
+                    } else if (s16 < Short.MIN_VALUE) {
+                        s16 = Short.MIN_VALUE;
+                    }
+                    sampleBuffer.put( (byte) ( s16 & 0xff ) );
+                    sampleBuffer.put( (byte) ( ( s16 >>> 8 ) & 0xff ) );
+                }
+            }
+            sampleBuffer.rewind();
+            sink.enqueueData(0 /* pts */, sampleBuffer, sample_count*bytesPerSample);
+            sampleBuffer.clear();
+        }
+
+        @Override
+        public void stop() {
+            if( null != sink ) {
+                if( DEBUG ) {
+                    System.err.println("Stop: "+sink);
+                }
+                sink.destroy();
+                sink = null;
+            } else {
+                new RuntimeException("AudioOutput stop attempted w/o sink")
+                        .printStackTrace();
+            }
+        }
+
+        @Override
+        public double getLatency() {
+            if (null == sink) {
+                return 0.0;
+            }
+            final int numBytes = sink.getQueuedByteCount();
+            final int numSamples = numBytes / (bytesPerSample * format.channelCount);
+            return ((double) numSamples) / format.sampleRate;
+        }
+
+        @Override
+        public void close() {
+            if( null != sink ) {
+                sink.destroy();
+            }
+        }
+    }
+
+    private class ALInputStream extends ALStream implements AudioDeviceInputStream {
+        public ALInputStream(final int deviceID, final int sampleRate, final int channelCount) {
+            super(deviceID, true, sampleRate, channelCount);
+            if( !di.isInput ) {
+                throw new RuntimeException("deviceID "+deviceID+", is not an input device: "+di);
+            }
+            throw new RuntimeException("Input not yet supported; Requested "+di);
+        }
+
+        @Override
+        public void start() {
+            throw new RuntimeException("Input not yet supported; Requested "+di);
+        }
+
+        final double[] oneDouble = { 0 };
+
+        @Override
+        public double read() {
+            read(oneDouble, 0, 1);
+            return oneDouble[0];
+        }
+
+        @Override
+        public int read(final double[] buffer) {
+            return read(buffer, 0, buffer.length);
+        }
+
+        @Override
+        public int read(final double[] buffer, final int start, final int count) {
+            throw new RuntimeException("Input not yet supported; Requested "+di);
+        }
+
+        @Override
+        public void stop() {
+        }
+
+        @Override
+        public double getLatency() {
+            return suggestedInputLatency;
+        }
+
+        @Override
+        public int available() {
+            return 0;
+        }
+
+        @Override
+        public void close() {
+        }
+
+    }
+
+    /**
+     * {@inheritDoc}
+     * <p>
+     * Original API doc parameter names were misleading (wrong), i.e. 'frameRate' was used for actual
+     * 'sampleRate', e.g. 44100 not 'frames/second'.
+     * </p>
+     * @param deviceID device ID
+     * @param sampleRate sampler per second, e.g. 44100
+     * @param channelCount channel count
+     */
+    @Override
+    public AudioDeviceOutputStream createOutputStream(final int deviceID, final int sampleRate, final int channelCount) {
+        return new ALOutputStream(deviceID, sampleRate, channelCount);
+    }
+
+    /**
+     * {@inheritDoc}
+     * <p>
+     * Original API doc parameter names were misleading (wrong), i.e. 'frameRate' was used for actual
+     * 'sampleRate', e.g. 44100 not 'frames/second'.
+     * </p>
+     * @param deviceID device ID
+     * @param sampleRate sampler per second, e.g. 44100
+     * @param channelCount channel count
+     */
+    @Override
+    public AudioDeviceInputStream createInputStream(final int deviceID, final int sampleRate, final int channelCount) {
+        return new ALInputStream(deviceID, sampleRate, channelCount);
+    }
+
+    @Override
+    public double getDefaultHighInputLatency(final int deviceID) {
+        return 3 * getDefaultLowInputLatency(deviceID);
+    }
+
+    @Override
+    public double getDefaultHighOutputLatency(final int deviceID) {
+        return 3 * getDefaultLowOutputLatency(deviceID);
+    }
+
+    @Override
+    public int getDefaultInputDeviceID() {
+        return defaultInputDeviceID;
+    }
+
+    @Override
+    public int getDefaultOutputDeviceID() {
+        return defaultOutputDeviceID;
+    }
+
+    @Override
+    public double getDefaultLowInputLatency(final int deviceID) {
+        final DeviceInfo di = getDeviceInfo(deviceID);
+        if( null != di ) {
+            return di.latency;
+        } else {
+            return DEFAULT_LATENCY;
+        }
+    }
+
+    @Override
+    public double getDefaultLowOutputLatency(final int deviceID) {
+        final DeviceInfo di = getDeviceInfo(deviceID);
+        if( null != di ) {
+            return di.latency;
+        } else {
+            return DEFAULT_LATENCY;
+        }
+    }
+
+    @Override
+    public int getDeviceCount() {
+        return deviceRecords.size();
+    }
+
+    @Override
+    public String getDeviceName(final int deviceID) {
+        return deviceRecords.get(deviceID).name;
+    }
+
+    @Override
+    public int getMaxInputChannels(final int deviceID) {
+        return maxInputChannels;
+    }
+
+    @Override
+    public int getMaxOutputChannels(final int deviceID) {
+        return maxOutputChannels;
+    }
+
+    @Override
+    public int setSuggestedOutputLatency(final double latency) {
+        suggestedOutputLatency = latency;
+        return 0;
+    }
+
+    @Override
+    public int setSuggestedInputLatency(final double latency) {
+        suggestedInputLatency = latency;
+        return 0;
+    }
+
+    @Override
+    public String getName() {
+        return "JOAL/OpenAL";
+    }
+
+}