Initial commit of redesigned internal processing and audio management.

Note: Several of the decoders are currently non-functioning in this
commit.  If you want the latest functioning codebase, please checkout
the commit prior to this one.  All decoders will eventually be updated
with this new architecture.

Currently broken:
- Logging and recording
- Aux decoders (Fleetsync/MDC/LoJack/Tait)
- LTR/Passport decoders

Changes in this commit:
- Module architecture for decoders and components with central
provisioning by the DecoderFactory
- Transition from Complex sample stream processing to float buffer
processing for improved memory management
- Redesigned filter structures - to support buffers and streams
- Resolved several memory leak issues
- Universal sharing of the thread pool manager
- Added centralized audio management with call/user prioritization and
new gui with mute/volume controls
- Embedded audio metadata for eventual streaming support
- Redesigned ProcessingChain to support independent re-use
- Added new TrafficChannelManager to handle traffic channel allocations
- Traffic Channel pool size and Call timeout available in P25 and
MPT1327 configs
- Redesigned channel and decoder gui components

src/spectrum/DFTProcessor.java

@@ -30,10 +30,10 @@ import org.jtransforms.fft.FloatFFT_1D;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import controller.NamingThreadFactory;
 import sample.Listener;
+import sample.SampleType;
 import sample.complex.ComplexBuffer;
-import source.Source;
-import source.Source.SampleType;
 import source.tuner.frequency.FrequencyChangeEvent;
 import source.tuner.frequency.FrequencyChangeListener;
 import spectrum.converter.DFTResultsConverter;
@@ -56,8 +56,8 @@ public class DFTProcessor implements Listener<ComplexBuffer>,
 	private ArrayBlockingQueue<ComplexBuffer> mQueue = 
 							new ArrayBlockingQueue<ComplexBuffer>( 200 );
 							
-	private ScheduledExecutorService mScheduler = 
-							Executors.newScheduledThreadPool(1);	
+	private ScheduledExecutorService mScheduler = Executors
+			.newScheduledThreadPool( 1, new NamingThreadFactory( "spectrum dft" ) );	
 	
 	private FFTWidth mFFTWidth = FFTWidth.FFT04096;
 	private FFTWidth mNewFFTWidth = FFTWidth.FFT04096;
@@ -129,7 +129,7 @@ public class DFTProcessor implements Listener<ComplexBuffer>,
 		setWindowType( mWindowType );
 	}
 	
-	public Source.SampleType getSampleType()
+	public SampleType getSampleType()
 	{
 		return mSampleType;
 	}
@@ -177,7 +177,7 @@ public class DFTProcessor implements Listener<ComplexBuffer>,
 		/**
          * Reset the scheduler
          */
-		mScheduler = Executors.newScheduledThreadPool(1);
+		mScheduler = Executors.newScheduledThreadPool( 1, new NamingThreadFactory( "spectrum dft" ) );
 
 		/**
 		 * Schedule the DFT to run calculations at a fixed rate
@@ -293,16 +293,25 @@ public class DFTProcessor implements Listener<ComplexBuffer>,
 				getNextBuffer();
 			}
 
-			int samplesAvailable = mCurrentBuffer.length - mCurrentBufferPointer;
-
-			while( remaining > 0 && samplesAvailable > 0 )
+			/* If we don't have new samples to use, send the current frame with
+			 * the remaining values as zero */
+			if( mCurrentBuffer == null )
 			{
-				currentFrame[ currentFramePointer++ ] = 
-						(float)mCurrentBuffer[ mCurrentBufferPointer++ ];
-				
-				samplesAvailable--;
-				remaining--;
-				newFloatsToConsumeThisFrame--;
+				remaining = 0;
+			}
+			else
+			{
+				int samplesAvailable = mCurrentBuffer.length - mCurrentBufferPointer;
+
+				while( remaining > 0 && samplesAvailable > 0 )
+				{
+					currentFrame[ currentFramePointer++ ] = 
+							(float)mCurrentBuffer[ mCurrentBufferPointer++ ];
+					
+					samplesAvailable--;
+					remaining--;
+					newFloatsToConsumeThisFrame--;
+				}
 			}
 		}
 		
@@ -355,18 +364,25 @@ public class DFTProcessor implements Listener<ComplexBuffer>,
 			{
 				getNextBuffer();
 			}
-			
-			int samplesAvailable = mCurrentBuffer.length - mCurrentBufferPointer;
-			
-			if( samplesAvailable >= samplesToPurge )
+
+			if( mCurrentBuffer != null )
 			{
-				mCurrentBufferPointer += samplesToPurge;
-				samplesToPurge = 0;
+				int samplesAvailable = mCurrentBuffer.length - mCurrentBufferPointer;
+				
+				if( samplesAvailable >= samplesToPurge )
+				{
+					mCurrentBufferPointer += samplesToPurge;
+					samplesToPurge = 0;
+				}
+				else
+				{
+					samplesToPurge -= samplesAvailable;
+					mCurrentBufferPointer = mCurrentBuffer.length;
+				}
 			}
 			else
 			{
-				samplesToPurge -= samplesAvailable;
-				mCurrentBufferPointer = mCurrentBuffer.length;
+				samplesToPurge = 0;
 			}
 		}
 	}