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/module/decode/mdc1200/MDCMessageProcessor.java

@@ -0,0 +1,155 @@
+/*******************************************************************************
+ *     SDR Trunk 
+ *     Copyright (C) 2014 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 module.decode.mdc1200;
+
+import message.Message;
+import sample.Broadcaster;
+import sample.Listener;
+import alias.AliasList;
+import bits.BinaryMessage;
+
+public class MDCMessageProcessor implements Listener<BinaryMessage>
+{
+	private static int sMESSAGE_LENGTH = 112;
+	
+	private Broadcaster<Message> mBroadcaster = new Broadcaster<Message>();
+	private AliasList mAliasList;
+	
+	public MDCMessageProcessor( AliasList aliasList )
+	{
+		mAliasList = aliasList;
+	}
+	
+	public void dispose()
+	{
+		mBroadcaster.dispose();
+	}
+	
+	@Override
+    public void receive( BinaryMessage buffer )
+    {
+		/**
+		 * De-interleave the 112 bits of message one, starting after the sync
+		 * pattern
+		 */
+		deinterleave( buffer, 40 );
+
+		/**
+		 * For simplicity, we also deinterleave message 2, which may or may not
+		 * be there, starting after the initial sync ( 0 - 39 ) and the initial
+		 * message ( 40 - 151 ) and the second sync ( 152 - 191 ).
+		 */
+		deinterleave( buffer, 192 );
+
+		/**
+		 * Wrap the buffer in a message along with the designated alias list
+		 * and send it on its merry way
+		 */
+		MDCMessage message = new MDCMessage( buffer, mAliasList );
+		
+    	mBroadcaster.receive( message );
+    }
+	
+    public void addMessageListener( Listener<Message> listener )
+    {
+		mBroadcaster.addListener( listener );
+    }
+
+    public void removeMessageListener( Listener<Message> listener )
+    {
+    	mBroadcaster.removeListener( listener );
+    }
+	
+	/**
+	 * Removes NRZ-I encoding from the entire buffer.  Assumes that the initial
+	 * bit will be a 0 after decode, despite what is currently in the buffer,
+	 * in order to maintain correct polarity of the decoded message.
+	 */
+	private void removeNRZIEncoding( BinaryMessage buffer )
+	{
+		/**
+		 * Clear bit position 0, the first bit of the sync pattern, to start
+		 * the decode with the correct polarity
+		 */
+		buffer.clear( 0 );
+
+		/**
+		 * Set each bit according to the state of the previous bit using XOR
+		 * as follows:
+		 * 
+		 * 	0 = same as previous state
+		 * 	1 = inverse of previous state
+		 */
+		for( int x = 1; x < buffer.size(); x++ )
+		{
+			if( buffer.get( x - 1 ) ^ buffer.get( x ) )
+			{
+				buffer.set( x );
+			}
+			else
+			{
+				buffer.clear( x );
+			}
+		}
+	}
+	
+	/**
+	 * Deinterleaves a 112-bit packet, starting at the offset into the buffer
+	 */
+	private void deinterleave( BinaryMessage buffer, int offset )
+	{
+		if( buffer.size() < sMESSAGE_LENGTH + offset )
+		{
+			throw new IllegalArgumentException( "MDCMessageProcessor - "
+				+ "cannot deinterleave message - message buffer too short" );
+		}
+		
+		BinaryMessage deinterleaved = new BinaryMessage( 112 );
+
+		int deinterleavedPointer = 0;
+		
+		for( int column = 0; column < 16; column++ )
+		{
+			for( int row = 0; row < 7; row++ )
+			{
+				if( buffer.get( ( row * 16 ) + column + offset ) )
+				{
+					deinterleaved.set( deinterleavedPointer );
+				}
+				
+				deinterleavedPointer++;
+			}
+		}
+
+		//Overlay the deinterleaved bits back onto the source message and
+		//return it
+		buffer.clear( offset, offset + sMESSAGE_LENGTH );
+		
+		for( int x = 0; x < sMESSAGE_LENGTH; x++ )
+		{
+			if( deinterleaved.get( x ) )
+			{
+				buffer.set( x + offset );
+			}
+			else
+			{
+				buffer.clear( x + offset );
+			}
+		}
+	}
+}