Automatic Frequency Control enhancement. Provides default AFC and ability to disable in the Decoder tab of each channel. Spectral display includes visual indicators of frequency center (grey) and current AFC offset (yellow).

src/controller/channel/ProcessingChain.java

@@ -34,13 +34,11 @@ import record.wave.ComplexWaveRecorder;
 import record.wave.FloatWaveRecorder;
 import sample.Broadcaster;
 import sample.Listener;
-import sample.Provider;
 import sample.complex.ComplexSample;
 import source.ComplexSource;
 import source.FloatArraySource;
 import source.FloatSource;
 import source.Source;
-import source.Source.SampleType;
 import source.SourceException;
 import source.config.SourceConfigMixer;
 import source.tuner.Tuner;
@@ -57,6 +55,8 @@ import controller.state.ChannelState;
 import controller.state.ChannelState.State;
 import decode.Decoder;
 import decode.DecoderFactory;
+import dsp.afc.AutomaticFrequencyControl;
+import dsp.afc.FrequencyErrorListener;
 import eventlog.EventLogType;
 import eventlog.EventLogger;
 
@@ -73,6 +73,7 @@ public class ProcessingChain implements Listener<Message>
 	protected List<Recorder> mRecorders = new ArrayList<Recorder>();
 	protected ArrayList<EventLogger> mEventLoggers = new ArrayList<EventLogger>();
 	protected AudioOutput mAudioOutput;
+	protected AutomaticFrequencyControl mAFC;
 	protected ChannelState mChannelState;
 	protected ResourceManager mResourceManager;
 	private ScheduledFuture<?> mProcessorTask;
@@ -101,6 +102,14 @@ public class ProcessingChain implements Listener<Message>
 							mChannel.getAliasListName() );
 		}
 	}
+
+	/**
+	 * Automatic Frequency Control, or null if disabled
+	 */
+	public AutomaticFrequencyControl getAFC()
+	{
+		return mAFC;
+	}
 	
 	public Listener<List<ComplexSample>> getComplexListener()
 	{
@@ -379,6 +388,28 @@ public class ProcessingChain implements Listener<Message>
 					
 					mAudioOutput = new AudioOutput( threadName );
 					addFloatListener( mAudioOutput );
+					
+					/* Automatic frequency control */
+					if( mAFC != null )
+					{
+						mAFC.dispose();
+						mAFC = null;
+					}
+					
+					if( mSource instanceof FrequencyErrorListener &&
+						mChannel.getDecodeConfiguration().isAFCEnabled() )
+					{
+						FrequencyErrorListener listener = 
+								(FrequencyErrorListener)mSource;
+						
+						mAFC = new AutomaticFrequencyControl( listener );
+
+						/* Register AFC to receive frequency change events */
+						listener.addListener( mAFC );
+
+						/* Add AFC as listener to the decoder */
+						mDecoder.addUnfilteredFloatListener( mAFC );
+					}
 				}
 			}