#296 APCO25 Phase II Decoder Implementation (#589)

P25 Phase 2 Decoder implementation.

src/main/java/io/github/dsheirer/audio/AudioModule.java

@@ -1,25 +1,28 @@
 /*
- * ******************************************************************************
- * sdrtrunk
- * Copyright (C) 2014-2019 Dennis Sheirer
  *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
  *
- * This program 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 for more details.
  *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>
- * *****************************************************************************
  */
 package io.github.dsheirer.audio;
 
 import io.github.dsheirer.audio.squelch.SquelchState;
+import io.github.dsheirer.audio.squelch.SquelchStateEvent;
 import io.github.dsheirer.dsp.filter.design.FilterDesignException;
 import io.github.dsheirer.dsp.filter.fir.FIRFilterSpecification;
 import io.github.dsheirer.dsp.filter.fir.real.RealFIRFilter2;
@@ -136,7 +139,7 @@ public class AudioModule extends AbstractAudioModule implements IReusableBufferL
 
 
     @Override
-    public Listener<SquelchState> getSquelchStateListener()
+    public Listener<SquelchStateEvent> getSquelchStateListener()
     {
         return mSquelchStateListener;
     }
@@ -169,7 +172,7 @@ public class AudioModule extends AbstractAudioModule implements IReusableBufferL
     }
 
     @Override
-    public Listener getReusableBufferListener()
+    public Listener<ReusableFloatBuffer> getReusableBufferListener()
     {
         //Redirect received reusable buffers to the receive(buffer) method
         return this;
@@ -178,12 +181,12 @@ public class AudioModule extends AbstractAudioModule implements IReusableBufferL
     /**
      * Wrapper for squelch state listener
      */
-    public class SquelchStateListener implements Listener<SquelchState>
+    public class SquelchStateListener implements Listener<SquelchStateEvent>
     {
         @Override
-        public void receive(SquelchState state)
+        public void receive(SquelchStateEvent event)
         {
-            if(state == SquelchState.SQUELCH && hasAudioPacketListener())
+            if(event.getSquelchState() == SquelchState.SQUELCH && hasAudioPacketListener())
             {
                 ReusableAudioPacket endAudioPacket = mAudioPacketQueue.getEndAudioBuffer();
                 endAudioPacket.resetAttributes();
@@ -192,7 +195,7 @@ public class AudioModule extends AbstractAudioModule implements IReusableBufferL
                 getAudioPacketListener().receive(endAudioPacket);
             }
 
-            mSquelchState = state;
+            mSquelchState = event.getSquelchState();
         }
     }
 }

src/main/java/io/github/dsheirer/audio/codec/mbe/AmbeAudioModule.java

@@ -0,0 +1,59 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.codec.mbe;
+
+import io.github.dsheirer.preference.UserPreferences;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public abstract class AmbeAudioModule extends JmbeAudioModule
+{
+    private static final Logger mLog = LoggerFactory.getLogger(AmbeAudioModule.class);
+    private static final String AMBE_CODEC = "AMBE 3600 x 2450";
+    private static boolean sLibraryStatusLogged = false;
+
+    public AmbeAudioModule(UserPreferences userPreferences)
+    {
+        super(userPreferences);
+
+        if(!sLibraryStatusLogged)
+        {
+            if(getAudioCodec() != null)
+            {
+                mLog.info("AMBE CODEC successfully loaded - P25-2/DMR/NXDN audio will be available");
+            }
+            else
+            {
+                mLog.warn("AMBE CODEC not loaded - P25-2/DMR/NXDN audio will NOT be available");
+            }
+
+            sLibraryStatusLogged = true;
+        }
+    }
+
+    @Override
+    protected String getCodecName()
+    {
+        return AMBE_CODEC;
+    }
+}

src/main/java/io/github/dsheirer/audio/codec/mbe/IEncryptionSyncParameters.java

@@ -0,0 +1,42 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.codec.mbe;
+
+import io.github.dsheirer.identifier.encryption.EncryptionKeyIdentifier;
+
+/**
+ * P25 Encryption Parameters
+ */
+public interface IEncryptionSyncParameters
+{
+    /**
+     * Encryption key identifier
+     */
+    EncryptionKeyIdentifier getEncryptionKey();
+
+    /**
+     * Message Indicator
+     * @return key generator fill values
+     */
+    String getMessageIndicator();
+}

src/main/java/io/github/dsheirer/audio/codec/mbe/ImbeAudioModule.java

@@ -0,0 +1,59 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.codec.mbe;
+
+import io.github.dsheirer.preference.UserPreferences;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public abstract class ImbeAudioModule extends JmbeAudioModule
+{
+    private static final Logger mLog = LoggerFactory.getLogger(ImbeAudioModule.class);
+    private static final String IMBE_CODEC = "IMBE";
+    private static boolean sLibraryStatusLogged = false;
+
+    public ImbeAudioModule(UserPreferences userPreferences)
+    {
+        super(userPreferences);
+
+        if(!sLibraryStatusLogged)
+        {
+            if(getAudioCodec() != null)
+            {
+                mLog.info("JMBE audio conversion library IMBE CODEC successfully loaded - P25-1 audio will be available");
+            }
+            else
+            {
+                mLog.warn("JMBE audio conversion library, IMBE CODEC not loaded - P25-1 audio will NOT be available");
+            }
+
+            sLibraryStatusLogged = true;
+        }
+    }
+
+    @Override
+    protected String getCodecName()
+    {
+        return IMBE_CODEC;
+    }
+}

src/main/java/io/github/dsheirer/audio/codec/mbe/JmbeAudioModule.java

@@ -0,0 +1,248 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.codec.mbe;
+
+import com.google.common.eventbus.Subscribe;
+import io.github.dsheirer.audio.AbstractAudioModule;
+import io.github.dsheirer.eventbus.MyEventBus;
+import io.github.dsheirer.message.IMessage;
+import io.github.dsheirer.message.IMessageListener;
+import io.github.dsheirer.preference.PreferenceType;
+import io.github.dsheirer.preference.UserPreferences;
+import io.github.dsheirer.sample.Listener;
+import io.github.dsheirer.sample.buffer.ReusableAudioPacketQueue;
+import jmbe.iface.IAudioCodec;
+import jmbe.iface.IAudioCodecLibrary;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.lang.reflect.InvocationTargetException;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+
+public abstract class JmbeAudioModule extends AbstractAudioModule implements Listener<IMessage>, IMessageListener
+{
+    private static final Logger mLog = LoggerFactory.getLogger(JmbeAudioModule.class);
+    private static final String JMBE_AUDIO_LIBRARY = "JMBE";
+    private static List<String> mLibraryLoadStatusLogged = new ArrayList<>();
+    private IAudioCodec mAudioCodec;
+    private UserPreferences mUserPreferences;
+    private ReusableAudioPacketQueue mAudioPacketQueue = new ReusableAudioPacketQueue("JmbeAudioModule");
+
+    public JmbeAudioModule(UserPreferences userPreferences)
+    {
+        mUserPreferences = userPreferences;
+        MyEventBus.getEventBus().register(this);
+        loadConverter();
+    }
+
+    protected IAudioCodec getAudioCodec()
+    {
+        return mAudioCodec;
+    }
+
+    /**
+     * Indicates that the JMBE audio library has been loaded and a suitable audio codec is usable (ie non-null)
+     */
+    protected boolean hasAudioCodec()
+    {
+        return getAudioCodec() != null;
+    }
+
+    protected ReusableAudioPacketQueue getAudioPacketQueue()
+    {
+        return mAudioPacketQueue;
+    }
+
+    @Override
+    public Listener<IMessage> getMessageListener()
+    {
+        return this;
+    }
+
+    /**
+     * Receives notifications that the JMBE library preference has been updated via the Guava event bus
+     *
+     * @param preferenceType that was updated
+     */
+    @Subscribe
+    public void preferenceUpdated(PreferenceType preferenceType)
+    {
+        if(preferenceType == PreferenceType.JMBE_LIBRARY)
+        {
+            mLibraryLoadStatusLogged.clear();
+            loadConverter();
+        }
+    }
+
+    /**
+     * Name of the CODEC to use from the JMBE library
+     */
+    protected abstract String getCodecName();
+
+    /**
+     * Loads audio frame processing chain.  Constructs an imbe targetdataline
+     * to receive the raw imbe frames.  Adds an IMBE to 8k PCM format conversion
+     * stream wrapper.  Finally, adds an upsampling (8k to 48k) stream wrapper.
+     */
+    protected void loadConverter()
+    {
+        IAudioCodec audioConverter = null;
+
+        Path path = mUserPreferences.getJmbeLibraryPreference().getPathJmbeLibrary();
+
+        if(path != null)
+        {
+            try
+            {
+                if(!mLibraryLoadStatusLogged.contains(JMBE_AUDIO_LIBRARY))
+                {
+                    mLog.info("Loading JMBE library from [" + path.toString() + "]");
+                }
+
+                URLClassLoader childClassLoader = new URLClassLoader(new URL[]{path.toUri().toURL()},
+                    this.getClass().getClassLoader());
+
+                Class classToLoad = Class.forName("jmbe.JMBEAudioLibrary", true, childClassLoader);
+
+                Object instance = classToLoad.getDeclaredConstructor().newInstance();
+
+                if(instance instanceof IAudioCodecLibrary)
+                {
+                    IAudioCodecLibrary library = (IAudioCodecLibrary)instance;
+
+                    if((library.getMajorVersion() == 1 && library.getMinorVersion() >= 0 &&
+                        library.getBuildVersion() >= 0) || library.getMajorVersion() >= 1)
+                    {
+                        audioConverter = library.getAudioConverter(getCodecName());
+
+                        if(!mLibraryLoadStatusLogged.contains(JMBE_AUDIO_LIBRARY))
+                        {
+                            mLog.info("JMBE audio conversion library loaded: " + library.getVersion());
+                            mLibraryLoadStatusLogged.add(JMBE_AUDIO_LIBRARY);
+                        }
+                    }
+                    else
+                    {
+                        if(!mLibraryLoadStatusLogged.contains(JMBE_AUDIO_LIBRARY))
+                        {
+                            mLog.warn("JMBE library version 1.0.0 or higher is required - found: " + library.getVersion());
+                            mLibraryLoadStatusLogged.add(JMBE_AUDIO_LIBRARY);
+                        }
+                    }
+                }
+                else
+                {
+                    if(!mLibraryLoadStatusLogged.contains(JMBE_AUDIO_LIBRARY))
+                    {
+                        mLog.info("JMBE audio conversion library NOT FOUND");
+                        mLibraryLoadStatusLogged.add(JMBE_AUDIO_LIBRARY);
+                    }
+                }
+            }
+            catch(IllegalArgumentException iae)
+            {
+                if(!mLibraryLoadStatusLogged.contains(JMBE_AUDIO_LIBRARY + getCodecName()))
+                {
+                    mLog.error("Couldn't load JMBE audio conversion library - " + iae.getMessage());
+                    mLibraryLoadStatusLogged.add(JMBE_AUDIO_LIBRARY + getCodecName());
+                }
+            }
+            catch(NoSuchMethodException nsme)
+            {
+                if(!mLibraryLoadStatusLogged.contains(JMBE_AUDIO_LIBRARY))
+                {
+                    mLog.error("Couldn't load JMBE audio conversion library - no such method exception");
+                    mLibraryLoadStatusLogged.add(JMBE_AUDIO_LIBRARY);
+                }
+            }
+            catch(MalformedURLException mue)
+            {
+                if(!mLibraryLoadStatusLogged.contains(JMBE_AUDIO_LIBRARY))
+                {
+                    mLog.error("Couldn't load JMBE audio conversion library from path [" + path + "]");
+                    mLibraryLoadStatusLogged.add(JMBE_AUDIO_LIBRARY);
+                }
+            }
+            catch(ClassNotFoundException e1)
+            {
+                if(!mLibraryLoadStatusLogged.contains(JMBE_AUDIO_LIBRARY))
+                {
+                    mLog.error("Couldn't load JMBE audio conversion library - class not found");
+                    mLibraryLoadStatusLogged.add(JMBE_AUDIO_LIBRARY);
+                }
+            }
+            catch(InvocationTargetException ite)
+            {
+                if(!mLibraryLoadStatusLogged.contains(JMBE_AUDIO_LIBRARY))
+                {
+                    mLog.error("Couldn't load JMBE audio conversion library - invocation target exception", ite);
+                    mLibraryLoadStatusLogged.add(JMBE_AUDIO_LIBRARY);
+                }
+            }
+            catch(InstantiationException e1)
+            {
+                if(!mLibraryLoadStatusLogged.contains(JMBE_AUDIO_LIBRARY))
+                {
+                    mLog.error("Couldn't load JMBE audio conversion library - instantiation exception", e1);
+                    mLibraryLoadStatusLogged.add(JMBE_AUDIO_LIBRARY);
+                }
+            }
+            catch(IllegalAccessException e1)
+            {
+                if(!mLibraryLoadStatusLogged.contains(JMBE_AUDIO_LIBRARY))
+                {
+                    mLog.error("Couldn't load JMBE audio conversion library - security restrictions");
+                    mLibraryLoadStatusLogged.add(JMBE_AUDIO_LIBRARY);
+                }
+            }
+        }
+        else
+        {
+            if(!mLibraryLoadStatusLogged.contains(JMBE_AUDIO_LIBRARY))
+            {
+                mLog.warn("JMBE audio library path is NOT SET in your User Preferences.");
+                mLibraryLoadStatusLogged.add(JMBE_AUDIO_LIBRARY);
+            }
+        }
+
+        if(audioConverter != null)
+        {
+            mAudioCodec = audioConverter;
+        }
+        else
+        {
+            mAudioCodec = null;
+        }
+    }
+
+    @Override
+    public void dispose()
+    {
+        mAudioCodec = null;
+    }
+}

src/main/java/io/github/dsheirer/audio/codec/mbe/MBECallSequence.java

@@ -0,0 +1,291 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.codec.mbe;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonPropertyOrder;
+import com.fasterxml.jackson.annotation.JsonRootName;
+import io.github.dsheirer.identifier.encryption.EncryptionKey;
+import io.github.dsheirer.module.decode.p25.audio.VoiceFrame;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * MBE Call Sequence containing one or more voice frames with optional encryption parameters and optional from and to
+ * radio identifiers.
+ */
+@JsonRootName("mbe_call")
+@JsonPropertyOrder({"protocol", "call_type", "from", "to", "encrypted", "frames"})
+@JsonInclude(JsonInclude.Include.NON_NULL)
+public class MBECallSequence
+{
+    private String mProtocol;
+    private String mFromIdentifier;
+    private String mToIdentifier;
+    private String mCallType;
+    private String mSystem;
+    private String mSite;
+    private boolean mEncrypted;
+    private List<VoiceFrame> mVoiceFrames = new ArrayList<>();
+    private IEncryptionSyncParameters mTemporaryEncryptionSyncParameters;
+
+    /**
+     * Constructs a call sequence
+     */
+    public MBECallSequence(String protocol)
+    {
+        mProtocol = protocol;
+    }
+
+    public MBECallSequence()
+    {
+        //no-arg constructor for faster jackson deserialization
+    }
+
+    /**
+     * Protocol/format for the voice frames
+     */
+    @JsonProperty("protocol")
+    public String getProtocol()
+    {
+        return mProtocol;
+    }
+
+    public void setProtocol(String protocol)
+    {
+        mProtocol = protocol;
+    }
+
+
+    /**
+     * Indicates if this sequences contains any audio frames
+     */
+    @JsonIgnore
+    public boolean hasAudio()
+    {
+        return mVoiceFrames.size() > 4;
+    }
+
+    /**
+     * Indicates if this call sequence is encrypted
+     */
+    @JsonProperty("encrypted")
+    public boolean isEncrypted()
+    {
+        return mEncrypted;
+    }
+
+    /**
+     * Sets the encrypted status of this call sequence
+     *
+     * @param encrypted status
+     */
+    public void setEncrypted(boolean encrypted)
+    {
+        mEncrypted = encrypted;
+    }
+
+    /**
+     * Sets encryption sync parameters to use with the next sequence of voice frames.  This is usually obtained from the
+     * HDU (phase1) or the PTT (phase2)
+     *
+     * @param encryptionSyncParameters to apply to the next set of voice frames
+     */
+    public void setEncryptionSyncParameters(IEncryptionSyncParameters encryptionSyncParameters)
+    {
+        mTemporaryEncryptionSyncParameters = encryptionSyncParameters;
+    }
+
+    /**
+     * Sets the from radio identifier
+     *
+     * @param from id
+     */
+    public void setFromIdentifier(String from)
+    {
+        if(from != null && !from.isEmpty() && !from.contentEquals("0"))
+        {
+            mFromIdentifier = from;
+        }
+    }
+
+    /**
+     * Radio identifier that originated the call
+     *
+     * @return from id
+     */
+    @JsonProperty("from")
+    public String getFromIdentifier()
+    {
+        return mFromIdentifier;
+    }
+
+    /**
+     * Sets the to radio identifier
+     *
+     * @param to id
+     */
+    public void setToIdentifier(String to)
+    {
+        if(to != null && !to.isEmpty() && !to.contentEquals("0"))
+        {
+            mToIdentifier = to;
+        }
+    }
+
+    /**
+     * Radio identifier that received the call
+     *
+     * @return to id
+     */
+    @JsonProperty("to")
+    public String getToIdentifier()
+    {
+        return mToIdentifier;
+    }
+
+    /**
+     * Call type
+     *
+     * @param type from GROUP, INDIVIDUAL, or TELEPHONE INTERCONNECT
+     */
+    public void setCallType(String type)
+    {
+        mCallType = type;
+    }
+
+    /**
+     * Sets the call type
+     *
+     * @return call type
+     */
+    @JsonProperty("call_type")
+    public String getCallType()
+    {
+        return mCallType;
+    }
+
+    /**
+     * System name defined by the user
+     * @return
+     */
+    @JsonProperty("system")
+    public String getSystem()
+    {
+        return mSystem;
+    }
+
+    /**
+     * Sets the system name
+     * @param system
+     */
+    public void setSystem(String system)
+    {
+        mSystem = system;
+    }
+
+    /**
+     * Site name defined by the user
+     * @return
+     */
+    @JsonProperty("site")
+    public String getSite()
+    {
+        return mSite;
+    }
+
+    /**
+     * Sets the site name
+     * @param site
+     */
+    public void setSite(String site)
+    {
+        mSite = site;
+    }
+
+    /**
+     * Ordered list of voice frames for the call sequence
+     *
+     * @return list of unencrypted or encrypted audio frames
+     */
+    @JsonProperty("frames")
+    public List<VoiceFrame> getVoiceFrames()
+    {
+        return mVoiceFrames;
+    }
+
+    public void setVoiceFrames(List<VoiceFrame> voiceFrames)
+    {
+        mVoiceFrames = voiceFrames;
+    }
+
+    /**
+     * Adds an unencrypted audio frame to this call sequence
+     *
+     * @param timestamp of the audio frame
+     * @param frame of hexadecimal values representing the transmitted audio frame and ecc bits
+     */
+    public void addVoiceFrame(long timestamp, String frame)
+    {
+        if(mTemporaryEncryptionSyncParameters != null)
+        {
+            addEncryptedVoiceFrame(timestamp, frame, mTemporaryEncryptionSyncParameters);
+            mTemporaryEncryptionSyncParameters = null;
+        }
+        else
+        {
+            mVoiceFrames.add(new VoiceFrame(timestamp, frame));
+        }
+    }
+
+    /**
+     * Adds an encrypted audio frame to this call sequence
+     *
+     * @param timestamp of the audio frame
+     * @param frame of hexadecimal values representing the transmitted audio frame and ecc bits
+     * @param parameters identifying the encryption used for the frame
+     */
+    public void addEncryptedVoiceFrame(long timestamp, String frame, IEncryptionSyncParameters parameters)
+    {
+        EncryptionKey encryption = parameters.getEncryptionKey().getValue();
+        addEncryptedVoiceFrame(timestamp, frame, encryption.getAlgorithm(), encryption.getKey(), parameters.getMessageIndicator());
+        setEncrypted(true);
+    }
+
+    /**
+     * Adds an encrypted audio frame to this call sequence
+     *
+     * @param timestamp of the audio frame
+     * @param frame of hexadecimal values representing the transmitted audio frame and ecc bits
+     * @param algorithm identifier for encryption
+     * @param keyid identifying which encryption key was used by the radio which may have multiple keys
+     * @param messageIndicator to seed the key generator
+     */
+    public void addEncryptedVoiceFrame(long timestamp, String frame, int algorithm, int keyid, String messageIndicator)
+    {
+        mVoiceFrames.add(new VoiceFrame(timestamp, frame, algorithm, keyid, messageIndicator));
+    }
+}

src/main/java/io/github/dsheirer/audio/codec/mbe/MBECallSequenceConverter.java

@@ -0,0 +1,122 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.codec.mbe;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import io.github.dsheirer.audio.convert.thumbdv.ThumbDv;
+import io.github.dsheirer.audio.convert.thumbdv.message.response.AmbeResponse;
+import io.github.dsheirer.module.decode.p25.audio.VoiceFrame;
+import io.github.dsheirer.record.wave.AudioPacketWaveRecorder;
+import io.github.dsheirer.record.wave.WaveMetadata;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+/**
+ * Utility for converting MBE call sequences (*.mbe) to PCM wave audio format
+ */
+public class MBECallSequenceConverter
+{
+    private final static Logger mLog = LoggerFactory.getLogger(MBECallSequenceConverter.class);
+
+    public static void convert(Path input, Path output) throws IOException
+    {
+        InputStream inputStream = Files.newInputStream(input);
+        ObjectMapper mapper = new ObjectMapper();
+        MBECallSequence sequence = mapper.readValue(inputStream, MBECallSequence.class);
+        convert(sequence, output);
+    }
+
+    public static void convert(MBECallSequence callSequence, Path outputPath)
+    {
+        if(callSequence == null || callSequence.isEncrypted())
+        {
+            throw new IllegalArgumentException("Cannot decode null or encrypted call sequence");
+        }
+
+        if(callSequence != null && !callSequence.isEncrypted())
+        {
+            ThumbDv.AudioProtocol protocol = ThumbDv.AudioProtocol.P25_PHASE2;
+
+            AudioPacketWaveRecorder recorder = new AudioPacketWaveRecorder(outputPath);
+            recorder.start();
+
+            long delayMillis = 0;
+
+            try(ThumbDv thumbDv = new ThumbDv(protocol, recorder))
+            {
+                thumbDv.start();
+                for(VoiceFrame voiceFrame: callSequence.getVoiceFrames())
+                {
+                    mLog.debug("Frame [" + voiceFrame.getFrame() + "] + Hex [" + AmbeResponse.toHex(voiceFrame.getFrameBytes()) + "]");
+                    thumbDv.decode(voiceFrame.getFrameBytes());
+                    delayMillis += 30;
+                }
+
+                if(delayMillis > 0)
+                {
+                    delayMillis += 1000;
+                    try
+                    {
+                        Thread.sleep(delayMillis);
+                    }
+                    catch(InterruptedException ie)
+                    {
+
+                    }
+                }
+            }
+            catch(IOException ioe)
+            {
+                mLog.error("Error", ioe);
+            }
+
+            recorder.stop(Paths.get(outputPath.toString().replace(".tmp", ".wav")), new WaveMetadata());
+        }
+    }
+
+    public static void main(String[] args)
+    {
+//        String mbe = "/home/denny/SDRTrunk/recordings/20190331085324_154250000_3_TS0_65084_6591007.mbe";
+//        String mbe = "/home/denny/SDRTrunk/recordings/20190331085324_154250000_2_TS1_65035.mbe";
+//
+//        Path input = Paths.get(mbe);
+//        Path output = Paths.get(mbe.replace(".mbe", ".tmp"));
+//
+//        mLog.info("Converting: " + mbe);
+//
+//        try
+//        {
+//            MBECallSequenceConverter.convert(input, output);
+//        }
+//        catch(IOException ioe)
+//        {
+//            mLog.error("Error", ioe);
+//        }
+    }
+}

src/main/java/io/github/dsheirer/audio/codec/mbe/MBECallSequenceReader.java

@@ -0,0 +1,79 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.codec.mbe;
+
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.google.common.base.Joiner;
+import io.github.dsheirer.module.decode.p25.audio.VoiceFrame;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * Reader for MBE call sequence recordings
+ */
+public class MBECallSequenceReader
+{
+    public static List<String> getAudioFrames(Path path) throws IOException
+    {
+        ObjectMapper mapper = new ObjectMapper();
+        Object obj = mapper.readValue(path.toFile(), MBECallSequence.class);
+
+        if(obj instanceof MBECallSequence)
+        {
+            MBECallSequence sequence = (MBECallSequence)obj;
+
+            List<String> audioFrames = new ArrayList<>();
+
+            for(VoiceFrame voiceFrame: sequence.getVoiceFrames())
+            {
+                audioFrames.add(voiceFrame.getFrame());
+            }
+
+            return audioFrames;
+        }
+
+        return Collections.emptyList();
+    }
+
+    public static void main(String[] args)
+    {
+        Path path = Path.of("/home/denny/SDRTrunk/recordings/20190706063149_154250000_7_TS1_65084_6591001.mbe");
+
+        try
+        {
+            List<String> frames = MBECallSequenceReader.getAudioFrames(path);
+
+            Files.writeString(Path.of("/home/denny/SDRTrunk/recordings/mbe_frames.txt"), Joiner.on("\",\n\"").join(frames));
+        }
+        catch(Exception e)
+        {
+            e.printStackTrace();
+        }
+    }
+}

src/main/java/io/github/dsheirer/audio/codec/mbe/MBECallSequenceRecorder.java

@@ -0,0 +1,163 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.codec.mbe;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import io.github.dsheirer.message.IMessage;
+import io.github.dsheirer.message.IMessageListener;
+import io.github.dsheirer.module.Module;
+import io.github.dsheirer.preference.TimestampFormat;
+import io.github.dsheirer.preference.UserPreferences;
+import io.github.dsheirer.sample.Listener;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Date;
+
+/**
+ * Records MBE audio frame call sequences and metadata to a JSON format recording file
+ */
+public abstract class MBECallSequenceRecorder extends Module implements IMessageListener, Listener<IMessage>
+{
+    private final static Logger mLog = LoggerFactory.getLogger(MBECallSequenceRecorder.class);
+
+    protected static final String CALL_TYPE_GROUP = "GROUP";
+    protected static final String CALL_TYPE_INDIVIDUAL = "INDIVIDUAL";
+    protected static final String CALL_TYPE_TELEPHONE_INTERCONNECT = "TELEPHONE INTERCONNECT";
+    protected UserPreferences mUserPreferences;
+    protected long mChannelFrequency;
+    protected String mSystem;
+    protected String mSite;
+    private int mCallNumber = 1;
+
+    /**
+     * Constructs an instance
+     * @param userPreferences to obtain recording directory
+     * @param channelFrequency for the channel to record
+     */
+    public MBECallSequenceRecorder(UserPreferences userPreferences, long channelFrequency, String system, String site)
+    {
+        mUserPreferences = userPreferences;
+        mChannelFrequency = channelFrequency;
+        mSystem = system;
+        mSite = site;
+    }
+
+    @Override
+    public void reset()
+    {
+    }
+
+    @Override
+    public void start()
+    {
+    }
+
+    @Override
+    public void dispose()
+    {
+    }
+
+    /**
+     * Writes an MBE call sequence recording to the recording directory
+     * @param sequence to write
+     */
+    protected void writeCallSequence(MBECallSequence sequence)
+    {
+        writeCallSequence(sequence, null);
+    }
+
+    /**
+     * Writes an MBE call sequence recording to the recording directory.
+     *
+     * @param optionalChannelTag to include in the filename
+     * @param sequence containing voice frames
+     */
+    protected void writeCallSequence(MBECallSequence sequence, String optionalChannelTag)
+    {
+        if(sequence != null && sequence.hasAudio())
+        {
+            sequence.setSystem(mSystem);
+            sequence.setSite(mSite);
+
+            StringBuilder sb = new StringBuilder();
+            sb.append(TimestampFormat.TIMESTAMP_COMPACT.getFormatter().format(new Date(System.currentTimeMillis())));
+            sb.append("_").append(mChannelFrequency);
+            sb.append("_").append(mCallNumber++);
+
+            if(mCallNumber < 1)
+            {
+                mCallNumber = 1;
+            }
+
+            if(optionalChannelTag != null)
+            {
+                sb.append("_").append(optionalChannelTag);
+            }
+
+            if(sequence.getToIdentifier() != null)
+            {
+                sb.append("_").append(sequence.getToIdentifier().replace(":", ""));
+            }
+            if(sequence.getFromIdentifier() != null)
+            {
+                sb.append("_").append(sequence.getFromIdentifier().replace(":", ""));
+            }
+
+            if(sequence.isEncrypted())
+            {
+                sb.append("_encrypted");
+            }
+
+            sb.append(".mbe");
+
+            Path recordingDirectory = mUserPreferences.getDirectoryPreference().getDirectoryRecording();
+            Path filePath = recordingDirectory.resolve(sb.toString());
+
+            try
+            {
+                OutputStream outputStream = Files.newOutputStream(filePath);
+                ObjectMapper mapper = new ObjectMapper();
+                mapper.writerWithDefaultPrettyPrinter().writeValue(outputStream, sequence);
+                outputStream.close();
+            }
+            catch(IOException ioe)
+            {
+                mLog.error("Couldn't write MBE call sequence to path [" + filePath.toString() + "]", ioe);
+            }
+        }
+    }
+
+    /**
+     * Implementation of IMessageListener interface
+     */
+    @Override
+    public Listener<IMessage> getMessageListener()
+    {
+        return this;
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/ThumbDv.java

@@ -0,0 +1,492 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv;
+
+import com.fazecast.jSerialComm.SerialPort;
+import io.github.dsheirer.audio.convert.thumbdv.message.AmbeMessage;
+import io.github.dsheirer.audio.convert.thumbdv.message.AmbeMessageFactory;
+import io.github.dsheirer.audio.convert.thumbdv.message.VocoderRate;
+import io.github.dsheirer.audio.convert.thumbdv.message.request.AmbeRequest;
+import io.github.dsheirer.audio.convert.thumbdv.message.request.DecodeSpeechRequest;
+import io.github.dsheirer.audio.convert.thumbdv.message.request.EncodeSpeechRequest;
+import io.github.dsheirer.audio.convert.thumbdv.message.request.ResetRequest;
+import io.github.dsheirer.audio.convert.thumbdv.message.request.SetVocoderParametersRequest;
+import io.github.dsheirer.audio.convert.thumbdv.message.request.SetVocoderRequest;
+import io.github.dsheirer.audio.convert.thumbdv.message.response.DecodeSpeechResponse;
+import io.github.dsheirer.audio.convert.thumbdv.message.response.ReadyResponse;
+import io.github.dsheirer.audio.convert.thumbdv.message.response.SetVocoderParameterResponse;
+import io.github.dsheirer.sample.Listener;
+import io.github.dsheirer.sample.buffer.ReusableAudioPacket;
+import io.github.dsheirer.sample.buffer.ReusableAudioPacketQueue;
+import io.github.dsheirer.util.ThreadPool;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.concurrent.LinkedTransferQueue;
+import java.util.concurrent.ScheduledFuture;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Northwest Digital Radio (NWDR) ThumbDv dongle.
+ *
+ * Note: linux users must allow access to the serial port:
+ *
+ * sudo usermod -a -G uucp username
+ * sudo usermod -a -G dialout username
+ * sudo usermod -a -G lock username
+ * sudo usermod -a -G tty username
+ */
+public class ThumbDv implements AutoCloseable
+{
+    private final static Logger mLog = LoggerFactory.getLogger(ThumbDv.class);
+    private static final String PORT_DESCRIPTION = "USB-to-Serial Port (ftdi_sio)";
+    private static final String PORT_DESCRIPTION_FRAGMENT = "USB Serial Port";
+    private static final int BAUD_RATE = 460800;
+    private static final byte PACKET_START = (byte) 0x61;
+
+    public enum AudioProtocol
+    {
+        DMR,
+        DSTAR,
+        NXDN,
+        P25_PHASE2,
+    }
+
+    private SerialPort mSerialPort;
+    private ScheduledFuture mSerialPortReaderHandle;
+    private ScheduledFuture mAudioDecodeProcessorHandle;
+    private LinkedTransferQueue<DecodeSpeechRequest> mDecodeSpeechRequests = new LinkedTransferQueue<>();
+    private AudioProtocol mAudioProtocol;
+    private Listener<ReusableAudioPacket> mAudioPacketListener;
+    private ReusableAudioPacketQueue mReusableAudioPacketQueue = new ReusableAudioPacketQueue("ThumbDv");
+    private boolean mStarted;
+
+    public ThumbDv(AudioProtocol audioProtocol, Listener<ReusableAudioPacket> listener)
+    {
+        mAudioProtocol = audioProtocol;
+        mAudioPacketListener = listener;
+    }
+
+    /**
+     * Enqueues the audio code frame for decoding.  Decoded PCM speech packet will be sent to the registered
+     * audio packet listener.
+     *
+     * @param codecFrame
+     */
+    public void decode(byte[] codecFrame)
+    {
+        if(!mStarted || mSerialPort == null)
+        {
+            throw new IllegalStateException("Must invoke start() method and thumbdv serial device must be available");
+        }
+
+        mDecodeSpeechRequests.offer(new DecodeSpeechRequest(codecFrame));
+    }
+
+    public void close() throws IOException
+    {
+        if(mSerialPortReaderHandle != null)
+        {
+            mSerialPortReaderHandle.cancel(true);
+            mSerialPortReaderHandle = null;
+        }
+
+        if(mSerialPort != null)
+        {
+            mSerialPort.closePort();
+        }
+    }
+
+    public void start() throws IOException
+    {
+        if(mSerialPort == null)
+        {
+            SerialPort[] ports = SerialPort.getCommPorts();
+
+            for(SerialPort port : ports)
+            {
+                mLog.debug("Serial Port Name:" + port.getDescriptivePortName());
+                if(port.getDescriptivePortName().contentEquals(PORT_DESCRIPTION) ||
+                        port.getDescriptivePortName().contains(PORT_DESCRIPTION_FRAGMENT))
+                {
+                    mSerialPort = port;
+                    mSerialPort.setBaudRate(BAUD_RATE);
+                    mSerialPort.openPort(0, 5000, 10000);
+
+                    if(mSerialPort.isOpen())
+                    {
+                        mLog.info("Resetting ThumbDv Device");
+                        send(new ResetRequest());
+
+                        mLog.info("Creating Serial Port Reader");
+                        final Runnable r = new SerialPortReader(mSerialPort.getInputStream());
+                        mLog.info("Starting Serial Port Reader");
+                        mSerialPortReaderHandle = ThreadPool.SCHEDULED.scheduleAtFixedRate(r, 0,
+                                5, TimeUnit.MILLISECONDS);
+
+                        mStarted = true;
+                        mLog.info("Startup complete - awaiting reset response");
+                    }
+                    else
+                    {
+                        mLog.warn("Could not open serial port: " + mSerialPort.getSystemPortName());
+                        throw new IOException("Could not open serial port:" + mSerialPort.getSystemPortName());
+                    }
+
+                    break;
+                }
+            }
+        }
+
+        if(mSerialPort == null)
+        {
+            throw new IOException("ThumbDV serial port not found");
+        }
+
+
+        return;
+    }
+
+    public void send(byte[] message) throws IOException
+    {
+        if(mSerialPort == null)
+        {
+            throw new IOException("ThumbDv must be started before use");
+        }
+
+        int bytesWritten = mSerialPort.writeBytes(message, message.length);
+
+        if(bytesWritten < 0)
+        {
+            throw new IOException("Unable to write message:" + Arrays.toString(message));
+        }
+        else if(bytesWritten != message.length)
+        {
+            throw new IOException("Unable to write message:" + Arrays.toString(message) + " Bytes Written:" + bytesWritten);
+        }
+    }
+
+    /**
+     * Sends the AMBE request message
+     *
+     * @param request message
+     * @throws IOException if there is an error
+     */
+    public void send(AmbeRequest request) throws IOException
+    {
+        send(request.getData());
+    }
+
+    private void receive(byte[] bytes)
+    {
+        AmbeMessage message = AmbeMessageFactory.getMessage(bytes);
+
+        if(message instanceof DecodeSpeechResponse && mAudioPacketListener != null)
+        {
+            float[] samples = ((DecodeSpeechResponse)message).getSamples();
+            ReusableAudioPacket audioPacket = mReusableAudioPacketQueue.getBuffer(samples.length);
+            audioPacket.loadAudioFrom(samples);
+            mAudioPacketListener.receive(audioPacket);
+        }
+        else if(message instanceof ReadyResponse && mAudioDecodeProcessorHandle == null)
+        {
+            if(mAudioDecodeProcessorHandle == null)
+            {
+                try
+                {
+                    switch(mAudioProtocol)
+                    {
+                        case DSTAR:
+                            send(new SetVocoderRequest(VocoderRate.RATE_33));
+                            send(new SetVocoderParametersRequest(0x0130, 0x0763, 0x4000, 0x0000, 0x0000, 0x0048));
+                            break;
+                        case DMR:
+                        case NXDN:
+                        case P25_PHASE2:
+                            send(new SetVocoderRequest(VocoderRate.RATE_33));
+                            send(new SetVocoderParametersRequest(0x0431, 0x0754, 0x2400, 0x0000, 0x0000, 0x6F48));
+                            break;
+                        default:
+                            throw new IllegalStateException("Unrecognized audio protocol:" + mAudioProtocol);
+                    }
+                }
+                catch(IOException ioe)
+                {
+                    mLog.error("Error setting audio protocol vocoder parameters");
+                }
+
+                mLog.info("ThumbDv Reset Complete");
+            }
+            else
+            {
+                mLog.info("ThumbDv Reset Detected");
+            }
+        }
+        else if(message instanceof SetVocoderParameterResponse)
+        {
+            if(((SetVocoderParameterResponse)message).isSuccessful())
+            {
+                mLog.info("Audio vocoder parameters configured for " + mAudioProtocol);
+                //Start the audio frame decode processor
+                mAudioDecodeProcessorHandle = ThreadPool.SCHEDULED.scheduleAtFixedRate(new AudioDecodeProcessor(), 0,
+                        10, TimeUnit.MILLISECONDS);
+            }
+        }
+        else if(message != null)
+        {
+            mLog.debug("RECEIVED:" + message.toString());
+        }
+    }
+
+    /**
+     * Logs the current settings of the serial port.  Note: you must invoke start() before this method so that
+     * the serial port can be discovered and opened.
+     */
+    public void logSerialPort()
+    {
+        if(mSerialPort != null)
+        {
+            StringBuilder sb = new StringBuilder();
+            sb.append("\nPort:\t\t\t").append(mSerialPort.getSystemPortName()).append("\n");
+            sb.append("Name:\t\t\t").append(mSerialPort.getDescriptivePortName()).append("\n");
+            sb.append("Baud Rate:\t\t").append(mSerialPort.getBaudRate()).append("\n");
+            sb.append("Data Bits:\t\t").append(mSerialPort.getNumDataBits()).append("\n");
+            sb.append("Parity Bits:\t").append(mSerialPort.getParity()).append("\n");
+            sb.append("Stop Bits:\t\t").append(mSerialPort.getNumStopBits()).append("\n");
+            sb.append("Flow Control:\t").append(mSerialPort.getFlowControlSettings()).append("\n");
+            sb.append("Is Open:\t\t").append(mSerialPort.isOpen()).append("\n");
+
+            mLog.info(sb.toString());
+        }
+        else
+        {
+            mLog.info("No serial port found");
+        }
+    }
+
+    /**
+     * Processes the audio frame decode queue
+     */
+    public class AudioDecodeProcessor implements Runnable
+    {
+        @Override
+        public void run()
+        {
+            try
+            {
+                DecodeSpeechRequest request = mDecodeSpeechRequests.poll();
+
+                if(request != null)
+                {
+                    try
+                    {
+                        send(request);
+                    }
+                    catch(IOException ioe)
+                    {
+                        mLog.error("Error decoding audio frame", ioe);
+                    }
+
+//                    try
+//                    {
+//                        //Force a 20ms sleep after submitting an audio frame to avoid overflowing the thumbdv
+//                        Thread.sleep(20);
+//                    }
+//                    catch(InterruptedException ie)
+//                    {
+//                        //Do nothing
+//                    }
+                }
+            }
+            catch(Throwable t)
+            {
+                mLog.error("Error", t);
+            }
+        }
+    }
+
+    public class SerialPortReader implements Runnable
+    {
+        private InputStream mInputStream;
+
+        public SerialPortReader(InputStream inputStream)
+        {
+            mInputStream = inputStream;
+        }
+
+        @Override
+        public void run()
+        {
+            try
+            {
+                if(mInputStream != null)
+                {
+                    try
+                    {
+                        while(mInputStream.available() > 0)
+                        {
+                            byte[] buffer = new byte[400];
+
+                            int bytesRead = mInputStream.readNBytes(buffer, 0, 1);
+
+                            if(bytesRead == 1 && buffer[0] == PACKET_START)
+                            {
+                                while(mInputStream.available() < 2)
+                                {
+                                    try
+                                    {
+                                        Thread.sleep(1);
+                                    }
+                                    catch(InterruptedException ie)
+                                    {
+                                    }
+                                }
+
+                                bytesRead = mInputStream.readNBytes(buffer, 1, 2);
+
+                                if(bytesRead == 2)
+                                {
+                                    int length = (0xFF & buffer[1]) << 8;
+                                    length += (0xFF & buffer[2]);
+
+                                    if(0 < length && length < 400)
+                                    {
+                                        length++; //Add a byte for the type byte
+
+                                        while(mInputStream.available() < length)
+                                        {
+                                            try
+                                            {
+                                                Thread.sleep(1);
+                                            }
+                                            catch(InterruptedException ie)
+                                            {
+                                            }
+                                        }
+
+                                        bytesRead = mInputStream.readNBytes(buffer, 3, length);
+
+                                        if(bytesRead == length)
+                                        {
+                                            receive(Arrays.copyOf(buffer, length + 3));
+                                        }
+                                        else
+                                        {
+                                            mLog.debug("Expected [" + length + "] but received [" + bytesRead + "] bytes - " + Arrays.toString(buffer));
+                                        }
+                                    }
+                                    else
+                                    {
+                                        mLog.error("Received packet with unexpected length: " + length);
+                                        //Don't process the buffer ... let the reader read and inspect 1 byte at a time
+                                        //to regain sync on the packet start byte
+                                    }
+                                }
+                                else
+                                {
+                                    mLog.debug("Expected [2] but received [" + bytesRead + "] -- this shouldn't happen");
+                                }
+                            }
+                            else
+                            {
+                                mLog.debug("Unrecognized byte: " + Arrays.toString(buffer));
+                            }
+                        }
+                    }
+                    catch(IOException ioe)
+                    {
+                        mLog.error("Error while reading ThumbDv serial port", ioe);
+                    }
+                }
+            }
+            catch(Throwable t)
+            {
+                mLog.error("Error", t);
+            }
+        }
+    }
+
+    public static void main(String[] args)
+    {
+        mLog.debug("Starting");
+
+        String silence = "BEDDEA821EFD660C08";
+
+        String[] frames = {"0E46122323067C60F8", "0E469433C1067CF1BC", "0E46122B23067C60F8", "0E67162BE08874E2B4",
+                "0E46163BE1067CF1BC", "0E46122B23067C60F8", "0A06163BE00A5C303E", "0E46122B23067C60F8", "0E46163BE1847CE1FC",
+                "0E46122B23067C60F8"};
+
+        List<byte[]> frameData = new ArrayList<>();
+
+        for(String frame : frames)
+        {
+            byte[] bytes = new byte[frame.length() / 2];
+            for(int x = 0; x < frame.length(); x += 2)
+            {
+                String hex = frame.substring(x, x + 2);
+                bytes[x / 2] = (byte) (0xFF & Integer.parseInt(hex, 16));
+            }
+
+            frameData.add(bytes);
+        }
+
+        mLog.debug("Starting thumb dv thread(s)");
+
+        final Listener<ReusableAudioPacket> listener = reusableAudioPacket -> {
+            mLog.info("Got an audio packet!");
+            reusableAudioPacket.decrementUserCount();
+        };
+
+        try(ThumbDv thumbDv = new ThumbDv(AudioProtocol.P25_PHASE2, listener))
+        {
+            thumbDv.start();
+
+            Thread.sleep(6000);
+
+            for(int x = 0; x < 20; x++)
+            {
+                thumbDv.send(new EncodeSpeechRequest(new short[160]));
+                Thread.sleep(20);
+            }
+//            for(byte[] frame : frameData)
+//            {
+//                thumbDv.decode(frame);
+//            }
+
+            while(true);
+        }
+        catch(IOException ioe)
+        {
+            mLog.error("Error", ioe);
+        }
+        catch(InterruptedException e)
+        {
+            e.printStackTrace();
+        }
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/AmbeMessage.java

@@ -0,0 +1,44 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message;
+
+/**
+ * AMBE-3000R Message
+ */
+public abstract class AmbeMessage
+{
+    /**
+     * Converts the byte array to a hexadecimal string array
+     */
+    public static String toHex(byte[] data)
+    {
+        StringBuilder sb = new StringBuilder();
+
+        for(byte b: data)
+        {
+            sb.append(String.format("%02X", b));
+        }
+
+        return sb.toString();
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/AmbeMessageFactory.java

@@ -0,0 +1,95 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.response.DecodeSpeechResponse;
+import io.github.dsheirer.audio.convert.thumbdv.message.response.EncodeSpeechResponse;
+import io.github.dsheirer.audio.convert.thumbdv.message.response.GetConfigResponse;
+import io.github.dsheirer.audio.convert.thumbdv.message.response.InitializeCodecResponse;
+import io.github.dsheirer.audio.convert.thumbdv.message.response.ProductIdResponse;
+import io.github.dsheirer.audio.convert.thumbdv.message.response.ReadyResponse;
+import io.github.dsheirer.audio.convert.thumbdv.message.response.SetChannelFormatResponse;
+import io.github.dsheirer.audio.convert.thumbdv.message.response.SetChannelResponse;
+import io.github.dsheirer.audio.convert.thumbdv.message.response.SetPacketModeResponse;
+import io.github.dsheirer.audio.convert.thumbdv.message.response.SetSpeechFormatResponse;
+import io.github.dsheirer.audio.convert.thumbdv.message.response.SetVocoderParameterResponse;
+import io.github.dsheirer.audio.convert.thumbdv.message.response.SetVocoderResponse;
+import io.github.dsheirer.audio.convert.thumbdv.message.response.UnknownResponse;
+import io.github.dsheirer.audio.convert.thumbdv.message.response.VersionResponse;
+
+public class AmbeMessageFactory
+{
+    private static final byte CONTROL_PACKET = (byte)0x00;
+    private static final byte CHANNEL_PACKET = (byte)0x01;
+    private static final byte SPEECH_PACKET = (byte)0x02;
+    private static final int INDEX_PACKET_TYPE = 3;
+    private static final int INDEX_CONTROL_PACKET_TYPE = 4;
+
+
+    public static AmbeMessage getMessage(byte[] data)
+    {
+        if(data != null && data.length >= 5)
+        {
+            if(data[INDEX_PACKET_TYPE] == CONTROL_PACKET)
+            {
+                PacketField packetField = PacketField.fromValue(data[INDEX_CONTROL_PACKET_TYPE]);
+
+                switch(packetField)
+                {
+                    case PKT_CHANNEL_0:
+                        return new SetChannelResponse(data);
+                    case PKT_CHANNEL_FORMAT:
+                        return new SetChannelFormatResponse(data);
+                    case PKT_CODEC_STOP:
+                        return new SetPacketModeResponse(data);
+                    case PKT_GET_CONFIG:
+                        return new GetConfigResponse(data);
+                    case PKT_INIT:
+                        return new InitializeCodecResponse(data);
+                    case PKT_PRODUCT_ID:
+                        return new ProductIdResponse(data);
+                    case PKT_RATE_PARAMETER:
+                        return new SetVocoderParameterResponse(data);
+                    case PKT_RATE_TABLE:
+                        return new SetVocoderResponse(data);
+                    case PKT_READY:
+                        return new ReadyResponse(data);
+                    case PKT_SPEECH_FORMAT:
+                        return new SetSpeechFormatResponse(data);
+                    case PKT_VERSION_STRING:
+                        return new VersionResponse(data);
+                }
+            }
+            else if(data[INDEX_PACKET_TYPE] == CHANNEL_PACKET)
+            {
+                return new EncodeSpeechResponse(data);
+            }
+            else if(data[INDEX_PACKET_TYPE] == SPEECH_PACKET)
+            {
+                return new DecodeSpeechResponse(data);
+            }
+        }
+
+        return new UnknownResponse(data);
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/InitializeOption.java

@@ -0,0 +1,47 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message;
+
+/**
+ * AMBE-3000 Initialization Options
+ */
+public enum InitializeOption
+{
+    ENCODER((byte)0x01),
+    DECODER((byte)0x02),
+    ENCODER_AND_DECODER((byte)0x03),
+    ECHO_CANCELLER((byte)0x04),
+    ENCODER_DECODER_ECHO_CANCELLER((byte)0x07);
+
+    private byte mCode;
+
+    InitializeOption(byte code)
+    {
+        mCode = code;
+    }
+
+    public byte getCode()
+    {
+        return mCode;
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/PacketField.java

@@ -0,0 +1,163 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message;
+
+/**
+ * AMBE-3000R Control Packet Field enumeration
+ */
+public enum PacketField
+{
+    PKT_ENCODER_CMODE((byte)0x05),
+    PKT_DECODER_CMODE((byte)0x06),
+    PKT_RATE_TABLE((byte)0x09),
+    PKT_RATE_PARAMETER((byte)0x0A),
+    PKT_INIT((byte)0x0B),
+    PKT_LOW_POWER((byte)0x10),
+    PKT_CHANNEL_FORMAT((byte)0x15),
+    PKT_SPEECH_FORMAT((byte)0x16),
+    PKT_CODEC_START((byte)0x2A),
+    PKT_CODEC_STOP((byte)0x2B),
+    PKT_PRODUCT_ID((byte)0x30),
+    PKT_VERSION_STRING((byte)0x31),
+    PKT_COMPAND((byte)0x32),
+    PKT_RESET((byte)0x33),
+    PKT_RESET_TO_SOFTWARE_CONFIG((byte)0x34),
+    PKT_HALT((byte)0x35),
+    PKT_GET_CONFIG((byte)0x36),
+    PKT_READ_CONFIG((byte)0x37),
+    PKT_CODEC_CFG((byte)0x38),
+    PKT_READY((byte)0x39),
+    PKT_PARITY_MODE((byte)0x3F),
+    PKT_CHANNEL_0((byte)0x40),
+    PKT_WRITE_I2C((byte)0x44),
+    PKT_CLEAR_CODEC_RESET((byte)0x46),
+    PKT_SET_CODEC_RESET((byte)0x47),
+    PKT_DISCARD_CODEC_SAMPLES((byte)0x48),
+    PKT_DELAY_NUMBER_MICRO_SECONDS((byte)0x49),
+    PKT_DELAY_NUMBER_NANO_SECONDS((byte)0x4A),
+    PKT_GAIN((byte)0x4B),
+    PKT_RTS_THRESHOLD((byte)0x4E),
+
+    //Speech packet values
+    SPEECH_DATA((byte)0x00),
+    CHANNEL_DATA_HARD_SYMBOL((byte)0x01),
+    CMODE((byte)0x02),
+    SAMPLE_COUNT((byte)0x03),
+    TONE((byte)0x08),
+    CHANNEL_DATA_SOFT_SYMBOL((byte)0x17),
+    VOCODER((byte)0x40),
+
+    //Packet Types
+    PACKET_TYPE_CONTROL((byte)0x00),
+    PACKET_TYPE_ENCODE_SPEECH((byte)0x01),
+    PACKET_TYPE_DECODE_SPEECH((byte)0x02),
+
+    UNKNOWN((byte)0x00);
+
+    private byte mCode;
+
+    PacketField(byte code)
+    {
+        mCode = code;
+    }
+
+    /**
+     * Packet type byte code value
+     */
+    public byte getCode()
+    {
+        return mCode;
+    }
+
+    /**
+     * Lookup a packet type from the code byte value
+     */
+    public static PacketField fromValue(byte value)
+    {
+        switch(value)
+        {
+            case (byte)0x05:
+                return PKT_ENCODER_CMODE;
+            case (byte)0x06:
+                return PKT_DECODER_CMODE;
+            case (byte)0x09:
+                return PKT_RATE_TABLE;
+            case (byte)0x0A:
+                return PKT_RATE_PARAMETER;
+            case (byte)0x0B:
+                return PKT_INIT;
+            case (byte)0x10:
+                return PKT_LOW_POWER;
+            case (byte)0x15:
+                return PKT_CHANNEL_FORMAT;
+            case (byte)0x16:
+                return PKT_SPEECH_FORMAT;
+            case (byte)0x2A:
+                return PKT_CODEC_START;
+            case (byte)0x2B:
+                return PKT_CODEC_STOP;
+            case (byte)0x30:
+                return PKT_PRODUCT_ID;
+            case (byte)0x31:
+                return PKT_VERSION_STRING;
+            case (byte)0x32:
+                return PKT_COMPAND;
+            case (byte)0x33:
+                return PKT_RESET;
+            case (byte)0x34:
+                return PKT_RESET_TO_SOFTWARE_CONFIG;
+            case (byte)0x35:
+                return PKT_HALT;
+            case (byte)0x36:
+                return PKT_GET_CONFIG;
+            case (byte)0x37:
+                return PKT_READ_CONFIG;
+            case (byte)0x38:
+                return PKT_CODEC_CFG;
+            case (byte)0x39:
+                return PKT_READY;
+            case (byte)0x3F:
+                return PKT_PARITY_MODE;
+            case (byte)0x40:
+                return PKT_CHANNEL_0;
+            case (byte)0x44:
+                return PKT_WRITE_I2C;
+            case (byte)0x46:
+                return PKT_CLEAR_CODEC_RESET;
+            case (byte)0x47:
+                return PKT_SET_CODEC_RESET;
+            case (byte)0x48:
+                return PKT_DISCARD_CODEC_SAMPLES;
+            case (byte)0x49:
+                return PKT_DELAY_NUMBER_MICRO_SECONDS;
+            case (byte)0x4A:
+                return PKT_DELAY_NUMBER_NANO_SECONDS;
+            case (byte)0x4B:
+                return PKT_GAIN;
+            case (byte)0x4E:
+                return PKT_RTS_THRESHOLD;
+            default:
+                return UNKNOWN;
+        }
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/VocoderRate.java

@@ -0,0 +1,129 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message;
+
+public enum VocoderRate
+{
+    //AMBE-1000 Standard Rates
+    RATE_0((byte)0x00, 2400,0),
+    RATE_1((byte)0x01, 3600,0),
+    RATE_2((byte)0x02, 3600,1200),
+    RATE_3((byte)0x03, 4800,0),
+    RATE_4((byte)0x04, 9600,0),
+    RATE_5((byte)0x05, 2350,50),
+    RATE_6((byte)0x06, 4850,4750),
+    RATE_7((byte)0x07, 4550,250),
+    RATE_8((byte)0x08, 3100,1700),
+    RATE_9((byte)0x09, 4400,2800),
+    RATE_10((byte)0x0A, 4150,2250),
+    RATE_11((byte)0x0B, 3350,250),
+    RATE_12((byte)0x0C, 7750,250),
+    RATE_13((byte)0x0D, 4650,3350),
+    RATE_14((byte)0x0E, 3750,250),
+    RATE_15((byte)0x0F, 4000,0),
+
+    //AMBE-2000 Standard Rates
+    RATE_16((byte)0x10, 3600,0),
+    RATE_17((byte)0x11, 4000,0),
+    RATE_18((byte)0x12, 4800,0),
+    RATE_19((byte)0x13, 6400,0),
+    RATE_20((byte)0x14, 8000,0),
+    RATE_21((byte)0x15, 9600,0),
+    RATE_22((byte)0x16, 2400,1600),
+    RATE_23((byte)0x17, 3600,1200),
+    RATE_24((byte)0x18, 4000,800),
+    RATE_25((byte)0x19, 2400,2400),
+    RATE_26((byte)0x1A, 4000,2400),
+    RATE_27((byte)0x1B, 4400,2800), //Is this compatible with APCO25 Phase 1?
+    RATE_28((byte)0x1C, 4000,4000),
+    RATE_29((byte)0x1D, 2400,7200),
+    RATE_30((byte)0x1E, 3600,6000),
+    RATE_31((byte)0x1F, 2000,0),
+    RATE_32((byte)0x20, 3600,2800),
+
+    //AMBE-3000 Standard Rates (AMBE+2)
+    RATE_33((byte)0x21, 2450,1150), //APCO25 HR (Phase 2), DMR, NXDN, DSTAR
+    RATE_34((byte)0x22, 2450,0),
+    RATE_35((byte)0x23, 2250,1150),
+    RATE_36((byte)0x24, 2250,0),
+    RATE_37((byte)0x25, 2400,0),
+    RATE_38((byte)0x26, 3000,0),
+    RATE_39((byte)0x27, 3600,0),
+    RATE_40((byte)0x28, 4000,0),
+    RATE_41((byte)0x29, 4400,0),
+    RATE_42((byte)0x2A, 4800,0),
+    RATE_43((byte)0x2B, 6400,0),
+    RATE_44((byte)0x2C, 7200,0),
+    RATE_45((byte)0x2D, 8000,0),
+    RATE_46((byte)0x2E, 9600,0),
+    RATE_47((byte)0x2F, 2450,250),
+    RATE_48((byte)0x30, 3350,250),
+    RATE_49((byte)0x31, 3750,250),
+    RATE_50((byte)0x32, 4550,250),
+    RATE_51((byte)0x33, 2450,1950),
+    RATE_52((byte)0x34, 2450,2350),
+    RATE_53((byte)0x35, 2450,3550),
+    RATE_54((byte)0x36, 2450,4750),
+    RATE_55((byte)0x37, 2600,1400),
+    RATE_56((byte)0x38, 3600,1200),
+    RATE_57((byte)0x39, 4000,800),
+    RATE_58((byte)0x3A, 4000,2400),
+    RATE_59((byte)0x3B, 4400,2800), //Is this compatible with APCO25 Phase 1?
+    RATE_60((byte)0x3C, 4000,4000),
+    RATE_61((byte)0x3D, 3600,6000);
+
+    private byte mCode;
+    private int mSpeechRate;
+    private int mFecRate;
+    
+    VocoderRate(byte code, int speechRate, int fecRate)
+    {
+        mCode = code;
+        mSpeechRate = speechRate;
+        mFecRate = fecRate;
+    }
+
+    /**
+     * Byte code value for the vocoder rate
+     */
+    public byte getCode()
+    {
+        return mCode;
+    }
+
+    /**
+     * Speech rate in bits per second (bps)
+     */
+    public int getSpeechRate()
+    {
+        return mSpeechRate;
+    }
+
+    /**
+     * Forward Error Correction rate in bits per second (bps)
+     */
+    public int getFecRate()
+    {
+        return mFecRate;
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/request/AmbeRequest.java

@@ -0,0 +1,67 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.request;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.AmbeMessage;
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+/**
+ * AMBE-3000R Request Packet
+ */
+public abstract class AmbeRequest extends AmbeMessage
+{
+    private static final byte PACKET_START_BYTE = (byte)0x61;
+    protected static final int PACKET_TYPE_INDEX = 3;
+    protected static final int PAYLOAD_START_INDEX = 4;
+
+    public abstract PacketField getType();
+    public abstract byte[] getData();
+
+    /**
+     * Creates a byte array of the specified length plus 4 packet header bytes with packet start, length and control
+     * bytes filled in.
+     *
+     * @param length of the message (not including the 4 byte packet header)
+     * @return byte array with packet header pre-filled.
+     */
+    protected byte[] createMessage(int length, PacketField type)
+    {
+        byte[] data = new byte[length + 4];
+
+        data[0] = PACKET_START_BYTE;
+        data[1] = (byte)((length >> 8 & 0xFF));
+        data[2] = (byte)(length & 0xFF);
+
+        if(type == PacketField.PACKET_TYPE_ENCODE_SPEECH || type == PacketField.PACKET_TYPE_DECODE_SPEECH)
+        {
+            data[PACKET_TYPE_INDEX] = type.getCode();
+        }
+        else
+        {
+            data[PACKET_TYPE_INDEX] = PacketField.PACKET_TYPE_CONTROL.getCode();
+            data[PAYLOAD_START_INDEX] = type.getCode();
+        }
+
+        return data;
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/request/DecodeSpeechRequest.java

@@ -0,0 +1,108 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.request;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+import io.github.dsheirer.audio.convert.thumbdv.message.VocoderRate;
+
+/**
+ * Decode speech request, used to request decode of an encoded audio frame.
+ */
+public class DecodeSpeechRequest extends AmbeRequest
+{
+    private static final int CHANNEL_DATA_IDENTIFIER_INDEX = 4;
+    private static final byte SAMPLE_COUNT = (byte)(0xFF & 160);  //8 kHz Audio sample count for 20ms frame
+
+    private byte[] mAudioFrame;
+    private VocoderRate mVocoderRate;
+
+    /**
+     * Constructs an audio frame decode request using the specified vocoder rate.
+     * @param audioFrame of encoded audio samples
+     * @param vocoderRate to use when decoding
+     */
+    public DecodeSpeechRequest(byte[] audioFrame, VocoderRate vocoderRate)
+    {
+        mAudioFrame = audioFrame;
+        mVocoderRate = vocoderRate;
+    }
+
+    /**
+     * Constructs an audio frame decode request using the current vocoder rate.
+     * @param audioFrame of encoded audio samples
+     */
+    public DecodeSpeechRequest(byte[] audioFrame)
+    {
+        this(audioFrame, null);
+    }
+
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PACKET_TYPE_ENCODE_SPEECH;
+    }
+
+    private boolean hasVocoderRate()
+    {
+        return mVocoderRate != null;
+    }
+
+    @Override
+    public byte[] getData()
+    {
+        if(hasVocoderRate())
+        {
+            int length = mAudioFrame.length + 9;
+
+            byte[] data = createMessage(length, getType());
+            int offset = CHANNEL_DATA_IDENTIFIER_INDEX;
+
+            data[offset++] = PacketField.VOCODER.getCode();
+            data[offset++] = mVocoderRate.getCode();
+
+            data[offset++] = PacketField.CHANNEL_DATA_HARD_SYMBOL.getCode();
+            data[offset++] = (byte)(0xFF & (mAudioFrame.length * 8));
+            System.arraycopy(mAudioFrame, 0, data, offset, mAudioFrame.length);
+            offset += mAudioFrame.length;
+            data[offset++] = PacketField.SAMPLE_COUNT.getCode();
+            data[offset++] = (byte)0xA0;
+            data[offset++] = (byte)0x02;
+            data[offset++] = (byte)0x00;
+            data[offset] = (byte)0x00;
+
+            return data;
+        }
+        else
+        {
+            int length = mAudioFrame.length + 2;
+            byte[] data = createMessage(length, getType());
+
+            int offset = CHANNEL_DATA_IDENTIFIER_INDEX;
+            data[offset++] = PacketField.CHANNEL_DATA_HARD_SYMBOL.getCode();
+            data[offset++] = (byte)(0xFF & (mAudioFrame.length * 8));
+            System.arraycopy(mAudioFrame, 0, data, offset, mAudioFrame.length);
+
+            return data;
+        }
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/request/EncodeSpeechRequest.java

@@ -0,0 +1,88 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.request;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+public class EncodeSpeechRequest extends AmbeRequest
+{
+    private static final int CHANNEL_IDENTIFIER_INDEX = 4;
+    private static final int SPEECH_DATA_IDENTIFIER_INDEX = 5;
+    private static final int SAMPLE_COUNT_INDEX = 6;
+    private static final int SPEECH_DATA_START_INDEX = 7;
+
+    private short[] mSamples;
+
+    public EncodeSpeechRequest(short[] samples)
+    {
+        mSamples = samples;
+    }
+
+    public EncodeSpeechRequest(float[] samples)
+    {
+        mSamples = new short[samples.length];
+
+        for(int x = 0; x < samples.length; x++)
+        {
+            if(samples[x] > 1.0f)
+            {
+                mSamples[x] = Short.MAX_VALUE;
+            }
+            else if(samples[x] < -1.0f)
+            {
+                mSamples[x] = Short.MIN_VALUE;
+            }
+            else
+            {
+                mSamples[x] = (short)(samples[x] * Short.MAX_VALUE);
+            }
+        }
+    }
+
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PACKET_TYPE_DECODE_SPEECH;
+    }
+
+    @Override
+    public byte[] getData()
+    {
+        int length = (mSamples.length * 2) + 3;
+        byte[] data = createMessage(length, getType());
+
+        data[CHANNEL_IDENTIFIER_INDEX] = PacketField.PKT_CHANNEL_0.getCode();
+        data[SPEECH_DATA_IDENTIFIER_INDEX] = (byte)0x00;
+        data[SAMPLE_COUNT_INDEX] = (byte)(0xFF & mSamples.length);
+
+        int pointer = SPEECH_DATA_START_INDEX;
+
+        for(short sample: mSamples)
+        {
+            data[pointer++] = (byte)((sample >> 8 & 0xFF));
+            data[pointer++] = (byte)(sample & 0xFF);
+        }
+
+        return data;
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/request/GetConfigRequest.java

@@ -0,0 +1,43 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.request;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+/**
+ * Get configuration request packet
+ */
+public class GetConfigRequest extends AmbeRequest
+{
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PKT_GET_CONFIG;
+    }
+
+    @Override
+    public byte[] getData()
+    {
+        return createMessage(1, getType());
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/request/InitializeCodecRequest.java

@@ -0,0 +1,54 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.request;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.InitializeOption;
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+/**
+ * Initialize CODEC request packet
+ */
+public class InitializeCodecRequest extends AmbeRequest
+{
+    private static final int INITIALIZE_OPTION_INDEX = 5;
+    private InitializeOption mInitializeOption;
+
+    public InitializeCodecRequest(InitializeOption option)
+    {
+        mInitializeOption = option;
+    }
+
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PKT_INIT;
+    }
+
+    @Override
+    public byte[] getData()
+    {
+        byte[] data = createMessage(2, getType());
+        data[INITIALIZE_OPTION_INDEX] = mInitializeOption.getCode();
+        return data;
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/request/ProductIdRequest.java

@@ -0,0 +1,43 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.request;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+/**
+ * Product ID request packet
+ */
+public class ProductIdRequest extends AmbeRequest
+{
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PKT_PRODUCT_ID;
+    }
+
+    @Override
+    public byte[] getData()
+    {
+        return createMessage(1, getType());
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/request/ResetRequest.java

@@ -0,0 +1,43 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.request;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+/**
+ * Reset request packet
+ */
+public class ResetRequest extends AmbeRequest
+{
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PKT_RESET;
+    }
+
+    @Override
+    public byte[] getData()
+    {
+        return createMessage(1, getType());
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/request/SetChannelFormatRequest.java

@@ -0,0 +1,48 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.request;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+/**
+ * Set channel format request packet
+ */
+public class SetChannelFormatRequest extends AmbeRequest
+{
+    private static final int FORMAT_INDEX = 5;
+    private static final byte FORMAT = (byte)0x00;
+
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PKT_CHANNEL_FORMAT;
+    }
+
+    @Override
+    public byte[] getData()
+    {
+        byte[] data = createMessage(2, getType());
+        data[FORMAT_INDEX] = FORMAT;
+        return data;
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/request/SetChannelRequest.java

@@ -0,0 +1,43 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.request;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+/**
+ * Set channel request packet
+ */
+public class SetChannelRequest extends AmbeRequest
+{
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PKT_CHANNEL_0;
+    }
+
+    @Override
+    public byte[] getData()
+    {
+        return createMessage(1, getType());
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/request/SetPacketModeRequest.java

@@ -0,0 +1,43 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.request;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+/**
+ * Packet mode (versus CODEC mode) request packet
+ */
+public class SetPacketModeRequest extends AmbeRequest
+{
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PKT_CODEC_STOP;
+    }
+
+    @Override
+    public byte[] getData()
+    {
+        return createMessage(1, getType());
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/request/SetSpeechFormatRequest.java

@@ -0,0 +1,48 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.request;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+/**
+ * Set speech format request packet
+ */
+public class SetSpeechFormatRequest extends AmbeRequest
+{
+    private static final int FORMAT_INDEX = 5;
+    private static final byte FORMAT = (byte)0x00;
+
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PKT_SPEECH_FORMAT;
+    }
+
+    @Override
+    public byte[] getData()
+    {
+        byte[] data = createMessage(2, getType());
+        data[FORMAT_INDEX] = FORMAT;
+        return data;
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/request/SetVocoderParametersRequest.java

@@ -0,0 +1,74 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.request;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+/**
+ * Set Vocoder parameters request packet
+ */
+public class SetVocoderParametersRequest extends AmbeRequest
+{
+    private int mWord0;
+    private int mWord1;
+    private int mWord2;
+    private int mWord3;
+    private int mWord4;
+    private int mWord5;
+
+    public SetVocoderParametersRequest(int word0, int word1, int word2, int word3, int word4, int word5)
+    {
+        mWord0 = word0;
+        mWord1 = word1;
+        mWord2 = word2;
+        mWord3 = word3;
+        mWord4 = word4;
+        mWord5 = word5;
+    }
+
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PKT_RATE_PARAMETER;
+    }
+
+    @Override
+    public byte[] getData()
+    {
+        byte[] data = createMessage(14, getType());
+        data[PAYLOAD_START_INDEX + 1] = (byte)(mWord0 >> 8 & 0xFF);
+        data[PAYLOAD_START_INDEX + 2] = (byte)(mWord0 & 0xFF);
+        data[PAYLOAD_START_INDEX + 3] = (byte)(mWord1 >> 8 & 0xFF);
+        data[PAYLOAD_START_INDEX + 4] = (byte)(mWord1 & 0xFF);
+        data[PAYLOAD_START_INDEX + 5] = (byte)(mWord2 >> 8 & 0xFF);
+        data[PAYLOAD_START_INDEX + 6] = (byte)(mWord2 & 0xFF);
+        data[PAYLOAD_START_INDEX + 7] = (byte)(mWord3 >> 8 & 0xFF);
+        data[PAYLOAD_START_INDEX + 8] = (byte)(mWord3 & 0xFF);
+        data[PAYLOAD_START_INDEX + 9] = (byte)(mWord4 >> 8 & 0xFF);
+        data[PAYLOAD_START_INDEX + 10] = (byte)(mWord4 & 0xFF);
+        data[PAYLOAD_START_INDEX + 11] = (byte)(mWord5 >> 8 & 0xFF);
+        data[PAYLOAD_START_INDEX + 12] = (byte)(mWord5 & 0xFF);
+
+        return data;
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/request/SetVocoderRequest.java

@@ -0,0 +1,53 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.request;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+import io.github.dsheirer.audio.convert.thumbdv.message.VocoderRate;
+
+/**
+ * Set Vocoder Rate request packet
+ */
+public class SetVocoderRequest extends AmbeRequest
+{
+    private VocoderRate mVocoderRate;
+
+    public SetVocoderRequest(VocoderRate rate)
+    {
+        mVocoderRate = rate;
+    }
+
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PKT_RATE_TABLE;
+    }
+
+    @Override
+    public byte[] getData()
+    {
+        byte[] data = createMessage(2, getType());
+        data[PAYLOAD_START_INDEX + 1] = mVocoderRate.getCode();
+        return data;
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/request/VersionRequest.java

@@ -0,0 +1,43 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.request;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+/**
+ * Version string request packet
+ */
+public class VersionRequest extends AmbeRequest
+{
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PKT_VERSION_STRING;
+    }
+
+    @Override
+    public byte[] getData()
+    {
+        return createMessage(1, getType());
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/response/AmbeResponse.java

@@ -0,0 +1,63 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.response;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.AmbeMessage;
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+import java.util.Arrays;
+
+/**
+ * AMBE-3000R Response Packet
+ */
+public abstract class AmbeResponse extends AmbeMessage
+{
+    protected static final int PAYLOAD_START_INDEX = 5;
+    private byte[] mMessage;
+
+    protected AmbeResponse(byte[] message)
+    {
+        mMessage = message;
+    }
+
+    /**
+     * Control packet type
+     */
+    public abstract PacketField getType();
+
+    /**
+     * Received message bytes
+     */
+    protected byte[] getMessage()
+    {
+        return mMessage;
+    }
+
+    /**
+     * Payload of the packet (does not include the packet header)
+     */
+    protected byte[] getPayload()
+    {
+        return Arrays.copyOfRange(getMessage(), PAYLOAD_START_INDEX, getMessage().length);
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/response/DecodeSpeechResponse.java

@@ -0,0 +1,59 @@
+/*******************************************************************************
+ * sdr-trunk
+ * Copyright (C) 2014-2019 Dennis Sheirer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
+ * License as published by  the Free Software Foundation, either version 3 of the License, or  (at your option) any
+ * later version.
+ *
+ * This program 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 for more details.
+ *
+ * You should have received a copy of the GNU General Public License  along with this program.
+ * If not, see <http://www.gnu.org/licenses/>
+ *
+ ******************************************************************************/
+
+package io.github.dsheirer.audio.convert.thumbdv.message.response;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+import io.github.dsheirer.sample.ConversionUtils;
+
+import java.util.Arrays;
+
+/**
+ * Decode speech response
+ */
+public class DecodeSpeechResponse extends AmbeResponse
+{
+    public DecodeSpeechResponse(byte[] message)
+    {
+        super(message);
+    }
+
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PACKET_TYPE_DECODE_SPEECH;
+    }
+
+
+    /**
+     * Payload of the packet (does not include the packet header)
+     */
+    protected byte[] getPayload()
+    {
+        return Arrays.copyOfRange(getMessage(), PAYLOAD_START_INDEX + 1, getMessage().length);
+    }
+
+    public float[] getSamples()
+    {
+        return ConversionUtils.convertFromSigned16BitSamples(getPayload());
+    }
+
+    @Override
+    public String toString()
+    {
+        return "DECODED SPEECH: SAMPLE COUNT:" + getSamples().length + " " + toHex(getPayload());
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/response/EncodeSpeechResponse.java

@@ -0,0 +1,59 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.response;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+import java.util.Arrays;
+
+/**
+ * Encode speech response
+ */
+public class EncodeSpeechResponse extends AmbeResponse
+{
+    public EncodeSpeechResponse(byte[] message)
+    {
+        super(message);
+    }
+
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PACKET_TYPE_ENCODE_SPEECH;
+    }
+
+
+    /**
+     * Payload of the packet (does not include the packet header)
+     */
+    protected byte[] getPayload()
+    {
+        return Arrays.copyOfRange(getMessage(), PAYLOAD_START_INDEX + 1, getMessage().length);
+    }
+
+    @Override
+    public String toString()
+    {
+        return "ENCODED SPEECH: " + toHex(getPayload()) + " " + Arrays.toString(getMessage());
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/response/GetConfigResponse.java

@@ -0,0 +1,49 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.response;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+/**
+ * Get configuration response
+ */
+public class GetConfigResponse extends AmbeResponse
+{
+    public GetConfigResponse(byte[] message)
+    {
+        super(message);
+    }
+
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PKT_GET_CONFIG;
+    }
+
+
+    @Override
+    public String toString()
+    {
+        return "CONFIGURATION: " + toHex(getPayload());
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/response/InitializeCodecResponse.java

@@ -0,0 +1,58 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.response;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+/**
+ * Initialize CODEC response
+ */
+public class InitializeCodecResponse extends AmbeResponse
+{
+    public InitializeCodecResponse(byte[] message)
+    {
+        super(message);
+    }
+
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PKT_INIT;
+    }
+
+    /**
+     * Success / fail
+     */
+    public boolean isSuccessful()
+    {
+        byte[] payload = getPayload();
+
+        return payload != null && payload.length ==1 && payload[0] == 0;
+    }
+
+    @Override
+    public String toString()
+    {
+        return "INITIALIZE CODEC " + (isSuccessful() ? "SUCCESSFUL" : "**FAILED**");
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/response/ProductIdResponse.java

@@ -0,0 +1,56 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.response;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+/**
+ * Product ID Response
+ */
+public class ProductIdResponse extends AmbeResponse
+{
+    public ProductIdResponse(byte[] message)
+    {
+        super(message);
+    }
+
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PKT_PRODUCT_ID;
+    }
+
+    /**
+     * Product ID string
+     */
+    public String getProductId()
+    {
+        return new String(getPayload()).trim();
+    }
+
+    @Override
+    public String toString()
+    {
+        return "PRODUCT ID:" + getProductId();
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/response/ReadyResponse.java

@@ -0,0 +1,50 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.response;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+import java.util.Arrays;
+
+/**
+ * Ready response
+ */
+public class ReadyResponse extends AmbeResponse
+{
+    public ReadyResponse(byte[] message)
+    {
+        super(message);
+    }
+
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PKT_READY;
+    }
+
+    @Override
+    public String toString()
+    {
+        return "READY" + Arrays.toString(getMessage());
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/response/ResetResponse.java

@@ -0,0 +1,57 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.response;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+/**
+ * Reset response
+ */
+public class ResetResponse extends AmbeResponse
+{
+    public ResetResponse(byte[] message)
+    {
+        super(message);
+    }
+
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PKT_RESET;
+    }
+
+    /**
+     * Success indicator
+     */
+    public boolean isSuccessful()
+    {
+        byte[] payload = getPayload();
+        return payload != null && payload.length ==1 && payload[0] == 0;
+    }
+
+    @Override
+    public String toString()
+    {
+        return "RESET " + (isSuccessful() ? "SUCCESSFUL" : "**FAILED**");
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/response/SetChannelFormatResponse.java

@@ -0,0 +1,58 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.response;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+/**
+ * Set channel format response
+ */
+public class SetChannelFormatResponse extends AmbeResponse
+{
+    public SetChannelFormatResponse(byte[] message)
+    {
+        super(message);
+    }
+
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PKT_CHANNEL_FORMAT;
+    }
+
+    /**
+     * Success or fail
+     */
+    public boolean isSuccessful()
+    {
+        byte[] payload = getPayload();
+
+        return payload != null && payload.length ==1 && payload[0] == 0;
+    }
+
+    @Override
+    public String toString()
+    {
+        return "SET CHANNEL FORMAT " + (isSuccessful() ? "SUCCESSFUL" : "**FAILED**");
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/response/SetChannelResponse.java

@@ -0,0 +1,57 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.response;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+/**
+ * Set Vocoder rate response
+ */
+public class SetChannelResponse extends AmbeResponse
+{
+    public SetChannelResponse(byte[] message)
+    {
+        super(message);
+    }
+
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PKT_CHANNEL_0;
+    }
+
+    /**
+     * Success indicator
+     */
+    public boolean isSuccessful()
+    {
+        byte[] payload = getPayload();
+        return payload != null && payload.length ==1 && payload[0] == 0;
+    }
+
+    @Override
+    public String toString()
+    {
+        return "SET CHANNEL 0 " + (isSuccessful() ? "SUCCESSFUL" : "**FAILED**");
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/response/SetPacketModeResponse.java

@@ -0,0 +1,58 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.response;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+/**
+ * Set packet mode response
+ */
+public class SetPacketModeResponse extends AmbeResponse
+{
+    public SetPacketModeResponse(byte[] message)
+    {
+        super(message);
+    }
+
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PKT_CODEC_STOP;
+    }
+
+    /**
+     * Success or fail
+     */
+    public boolean isSuccessful()
+    {
+        byte[] payload = getPayload();
+
+        return payload != null && payload.length ==1 && payload[0] == 0;
+    }
+
+    @Override
+    public String toString()
+    {
+        return "SET PACKET MODE " + (isSuccessful() ? "SUCCESSFUL" : "**FAILED**");
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/response/SetSpeechFormatResponse.java

@@ -0,0 +1,58 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.response;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+/**
+ * Set speech format response
+ */
+public class SetSpeechFormatResponse extends AmbeResponse
+{
+    public SetSpeechFormatResponse(byte[] message)
+    {
+        super(message);
+    }
+
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PKT_SPEECH_FORMAT;
+    }
+
+    /**
+     * Success or fail
+     */
+    public boolean isSuccessful()
+    {
+        byte[] payload = getPayload();
+
+        return payload != null && payload.length ==1 && payload[0] == 0;
+    }
+
+    @Override
+    public String toString()
+    {
+        return "SET SPEECH FORMAT " + (isSuccessful() ? "SUCCESSFUL" : "**FAILED**");
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/response/SetVocoderParameterResponse.java

@@ -0,0 +1,65 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.response;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+/**
+ * Set Vocoder parameter response
+ */
+public class SetVocoderParameterResponse extends AmbeResponse
+{
+    public SetVocoderParameterResponse(byte[] message)
+    {
+        super(message);
+    }
+
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PKT_RATE_PARAMETER;
+    }
+
+    /**
+     * Success indicator
+     */
+    public boolean isSuccessful()
+    {
+        byte[] payload = getPayload();
+
+        return payload != null && payload.length ==3 && payload[0] == 0;
+    }
+
+    @Override
+    public String toString()
+    {
+        if(isSuccessful())
+        {
+            return "SET VOCODER RATE SUCCESSFUL";
+        }
+        else
+        {
+            return "SET VOCODER RATE **FAILED** - RESPONSE:" + toHex(getPayload());
+        }
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/response/SetVocoderResponse.java

@@ -0,0 +1,58 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.response;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+/**
+ * Set Vocoder rate response
+ */
+public class SetVocoderResponse extends AmbeResponse
+{
+    public SetVocoderResponse(byte[] message)
+    {
+        super(message);
+    }
+
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PKT_RATE_TABLE;
+    }
+
+    /**
+     * Success indicator
+     */
+    public boolean isSuccessful()
+    {
+        byte[] payload = getPayload();
+
+        return payload != null && payload.length ==1 && payload[0] == 0;
+    }
+
+    @Override
+    public String toString()
+    {
+        return "SET VOCODER RATE " + (isSuccessful() ? "SUCCESSFUL" : "**FAILED**");
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/response/UnknownResponse.java

@@ -0,0 +1,50 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.response;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+import java.util.Arrays;
+
+/**
+ * Unknown Response Message
+ */
+public class UnknownResponse extends AmbeResponse
+{
+    public UnknownResponse(byte[] message)
+    {
+        super(message);
+    }
+
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.UNKNOWN;
+    }
+
+    @Override
+    public String toString()
+    {
+        return "UNKNOWN MESSAGE:" + Arrays.toString(getMessage());
+    }
+}

src/main/java/io/github/dsheirer/audio/convert/thumbdv/message/response/VersionResponse.java

@@ -0,0 +1,56 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.convert.thumbdv.message.response;
+
+import io.github.dsheirer.audio.convert.thumbdv.message.PacketField;
+
+/**
+ * Version Response
+ */
+public class VersionResponse extends AmbeResponse
+{
+    public VersionResponse(byte[] message)
+    {
+        super(message);
+    }
+
+    @Override
+    public PacketField getType()
+    {
+        return PacketField.PKT_VERSION_STRING;
+    }
+
+    /**
+     * Version string
+     */
+    public String getVersion()
+    {
+        return new String(getPayload()).trim();
+    }
+
+    @Override
+    public String toString()
+    {
+        return "VERSION:" + getVersion();
+    }
+}

src/main/java/io/github/dsheirer/audio/playback/AudioOutput.java

@@ -1,21 +1,23 @@
 /*
- * ******************************************************************************
- * sdrtrunk
- * Copyright (C) 2014-2019 Dennis Sheirer
  *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
  *
- * This program 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 for more details.
  *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>
- * *****************************************************************************
  */
 package io.github.dsheirer.audio.playback;
 
@@ -54,7 +56,7 @@ public abstract class AudioOutput implements Listener<ReusableAudioPacket>, Line
     private LinkedTransferQueue<ReusableAudioPacket> mBuffer = new LinkedTransferQueue<>();
     private int mBufferStartThreshold;
     private int mBufferStopThreshold;
-    private static IdentifierCollection EMPTY_IDENTIFIER_COLLECTION = new IdentifierCollection();
+    private static IdentifierCollection EMPTY_IDENTIFIER_COLLECTION = new IdentifierCollection(0);
     static
     {
         EMPTY_IDENTIFIER_COLLECTION.setUpdated(true);

src/main/java/io/github/dsheirer/audio/squelch/ISquelchStateListener.java

@@ -1,8 +1,30 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
 package io.github.dsheirer.audio.squelch;
 
 import io.github.dsheirer.sample.Listener;
 
 public interface ISquelchStateListener
 {
-	public Listener<SquelchState> getSquelchStateListener();
+	Listener<SquelchStateEvent> getSquelchStateListener();
 }

src/main/java/io/github/dsheirer/audio/squelch/ISquelchStateProvider.java

@@ -1,9 +1,32 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
 package io.github.dsheirer.audio.squelch;
 
 import io.github.dsheirer.sample.Listener;
 
 public interface ISquelchStateProvider
 {
-	public void setSquelchStateListener( Listener<SquelchState> listener );
-	public void removeSquelchStateListener();
+    void setSquelchStateListener(Listener<SquelchStateEvent> listener);
+
+    void removeSquelchStateListener();
 }

src/main/java/io/github/dsheirer/audio/squelch/SquelchStateEvent.java

@@ -0,0 +1,72 @@
+/*
+ *
+ *  * ******************************************************************************
+ *  * Copyright (C) 2014-2019 Dennis Sheirer
+ *  *
+ *  * This program is free software: you can redistribute it and/or modify
+ *  * it under the terms of the GNU General Public License as published by
+ *  * the Free Software Foundation, either version 3 of the License, or
+ *  * (at your option) any later version.
+ *  *
+ *  * This program 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 for more details.
+ *  *
+ *  * You should have received a copy of the GNU General Public License
+ *  * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *  * *****************************************************************************
+ *
+ *
+ */
+
+package io.github.dsheirer.audio.squelch;
+
+/**
+ * Squelch state change event
+ */
+public class SquelchStateEvent
+{
+    private SquelchState mSquelchState;
+    private int mTimeslot;
+
+    public SquelchStateEvent(SquelchState squelchState, int timeslot)
+    {
+        mSquelchState = squelchState;
+        mTimeslot = timeslot;
+    }
+
+    public SquelchState getSquelchState()
+    {
+        return mSquelchState;
+    }
+
+    /**
+     * Timeslot associated with the squelch state
+     */
+    public int getTimeslot()
+    {
+        return mTimeslot;
+    }
+
+    /**
+     * Creates a squelch state event with a default timeslot of 0
+     * @param squelchState for the event
+     * @return event
+     */
+    public static SquelchStateEvent create(SquelchState squelchState)
+    {
+        return new SquelchStateEvent(squelchState, 0);
+    }
+
+    /**
+     * Creates a squelch state event for the specified timeslot
+     * @param squelchState for the event
+     * @param timeslot that the event applies to
+     * @return event
+     */
+    public static SquelchStateEvent create(SquelchState squelchState, int timeslot)
+    {
+        return new SquelchStateEvent(squelchState, timeslot);
+    }
+}