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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
// written by Christian Daniel //
// //
// 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 as version 3 of the License, or //
// //
// 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 V3 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/>. //
///////////////////////////////////////////////////////////////////////////////////
#ifndef INCLUDE_NFMDEMOD_H
#define INCLUDE_NFMDEMOD_H
#include <vector>
#include "samplesink.h"
#include "nco.h"
#include "interpolator.h"
#include "lowpass.h"
#include "pidcontroller.h"
#include "hardware/audiofifo.h"
class AudioOutput;
class NFMDemod : public SampleSink {
public:
NFMDemod();
~NFMDemod();
void feed(SampleVector::const_iterator begin, SampleVector::const_iterator end, bool firstOfBurst);
void start();
void stop();
void setSampleRate(int sampleRate);
void handleMessage(Message* cmd);
private:
struct AudioSample {
qint16 l;
qint16 r;
};
typedef std::vector<AudioSample> AudioVector;
Real m_squelchLevel;
int m_sampleRate;
int m_frequency;
NCO m_nco;
Interpolator m_interpolator;
Real m_sampleDistanceRemain;
Lowpass<Real> m_lowpass;
int m_squelchState;
Complex m_lastSample;
AudioVector m_audioBuffer;
uint m_audioBufferFill;
AudioOutput* m_audioOutput;
AudioFifo m_audioFifo;
};
#endif // INCLUDE_NFMDEMOD_H
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