P25 audio decoder integration.

Auto-discovers the jmbe ( https://github.com/DSheirer/jmbe ) library at startup and provides decode P25 Phase 1 audio

src/audio/AudioOutputImpl.java

@@ -30,12 +30,11 @@ import org.slf4j.LoggerFactory;
 import sample.real.RealSampleListener;
 import buffer.FloatSampleBufferAssembler;
 
-public class AudioOutput implements RealSampleListener, 
-									SquelchListener,
-									AudioTypeListener
+public class AudioOutputImpl implements RealSampleListener, 
+	SquelchListener, IAudioTypeListener, IAudioOutput
 {
 	private final static Logger mLog = 
-			LoggerFactory.getLogger( AudioOutput.class );
+			LoggerFactory.getLogger( AudioOutputImpl.class );
 	private static final int sAUDIO_BLOCK_SIZE = 24000;
 	
     private static final AudioFormat sAUDIO_FORMAT = 
@@ -54,7 +53,7 @@ public class AudioOutput implements RealSampleListener,
 	private boolean mEnabled = false;
 	private SquelchState mSquelchState = SquelchState.SQUELCH;
 	
-	public AudioOutput( String channelName )
+	public AudioOutputImpl( String channelName )
 	{
 		try
         {
@@ -75,11 +74,13 @@ public class AudioOutput implements RealSampleListener,
 		mSquelchState = state;
     }
 	
+	@Override
 	public void setAudioPlaybackEnabled( boolean enabled )
 	{
 		mEnabled = enabled;
 	}
 	
+	@Override
 	public void dispose()
 	{
 		mOutput.stop();

src/audio/IAudioOutput.java

@@ -0,0 +1,28 @@
+package audio;
+
+import audio.SquelchListener.SquelchState;
+
+public interface IAudioOutput
+{
+	/**
+	 * Squelch / Unsquelch state for this channel 
+	 */
+	public abstract void setSquelch( SquelchState state );
+
+	/**
+	 * Audio playback defines if this channel is currently playing on the 
+	 * system speakers. 
+	 */
+	public abstract void setAudioPlaybackEnabled( boolean enabled );
+
+	/**
+	 * Dispose of any system resources for this audio output
+	 */
+	public abstract void dispose();
+
+	/**
+	 * Sets the audio to normal or inverted output 
+	 */
+	public abstract void setAudioType( AudioType type );
+
+}

src/audio/IAudioTypeListener.java

@@ -17,7 +17,7 @@
  ******************************************************************************/
 package audio;
 
-public interface AudioTypeListener
+public interface IAudioTypeListener
 {
 	public void setAudioType( AudioType type );
 }