public LJ1200Decoder(AliasList aliasList) {
mDecimationFilter =
new HalfBandFilter_RB_RB(
Filters.FIR_HALF_BAND_31T_ONE_EIGHTH_FCO.getCoefficients(), 1.0f, true);
mBandPassFilter =
new RealFIRFilter_RB_RB(Filters.FIRBP_1200FSK_24000FS.getCoefficients(), 1.02f);
mDecimationFilter.setListener(mBandPassFilter);
mFSKDecoder = new FSK2Decoder(DECIMATED_SAMPLE_RATE, SYMBOL_RATE, Output.INVERTED);
mBandPassFilter.setListener(mFSKDecoder);
mFSKDecoder.setListener(mFSKDecoderBroadcaster);
mTowerMessageFramer = new MessageFramer(SyncPattern.LJ1200.getPattern(), MESSAGE_LENGTH);
mTransponderMessageFramer =
new MessageFramer(SyncPattern.LJ1200_TRANSPONDER.getPattern(), MESSAGE_LENGTH);
mFSKDecoderBroadcaster.addListener(mTowerMessageFramer);
mFSKDecoderBroadcaster.addListener(mTransponderMessageFramer);
mMessageProcessor = new LJ1200MessageProcessor(aliasList);
mTowerMessageFramer.addMessageListener(mMessageProcessor);
mTransponderMessageFramer.addMessageListener(mMessageProcessor);
mMessageProcessor.setMessageListener(this);
}
/**
* Monitors the source data line playback state and broadcasts audio events to the registered
* listener as the state changes
*/
@Override
public void update(LineEvent event) {
LineEvent.Type type = event.getType();
if (type == LineEvent.Type.START) {
mAudioEventBroadcaster.broadcast(mAudioStartEvent);
} else if (type == LineEvent.Type.STOP) {
mAudioEventBroadcaster.broadcast(mAudioStopEvent);
}
}
/** Disposes any resources or pointers held by this instance to prepare for garbage collection */
public void dispose() {
mCallEventBroadcaster.dispose();
mCallEventBroadcaster = null;
mChangedAttributeListener = null;
mDecoderStateListener = null;
mMetadataListener = null;
mAliasList = null;
}
public void dispose() {
mCanProcessAudio = false;
if (mProcessorTask != null && mThreadPoolManager != null) {
mThreadPoolManager.cancel(mProcessorTask);
}
mThreadPoolManager = null;
mProcessorTask = null;
mBuffer.clear();
mAudioEventBroadcaster.dispose();
mAudioEventBroadcaster = null;
mAudioMetadataListener = null;
if (mOutput != null) {
mOutput.close();
}
mOutput = null;
mGainControl = null;
mMuteControl = null;
}
/** Broadcasts an audio event to the registered listener */
private void broadcast(AudioEvent audioEvent) {
mAudioEventBroadcaster.broadcast(audioEvent);
}
public void removeAudioEventListener(Listener<AudioEvent> listener) {
mAudioEventBroadcaster.removeListener(listener);
}
/** Registers a single listener to receive audio start and audio stop events */
public void addAudioEventListener(Listener<AudioEvent> listener) {
mAudioEventBroadcaster.addListener(listener);
}
/** Removes the call event listener */
@Override
public void removeCallEventListener(Listener<CallEvent> listener) {
mCallEventBroadcaster.removeListener(listener);
}
/** Adds a call event listener */
@Override
public void addCallEventListener(Listener<CallEvent> listener) {
mCallEventBroadcaster.addListener(listener);
}
/** Broadcasts a call event to any registered listeners */
protected void broadcast(CallEvent event) {
mCallEventBroadcaster.broadcast(event);
}