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107 lines
3.3 KiB
C
107 lines
3.3 KiB
C
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///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany //
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// written by Christian Daniel //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#ifndef INCLUDE_NFMDEMOD_H
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#define INCLUDE_NFMDEMOD_H
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#include <vector>
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#include "dsp/samplesink.h"
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#include "dsp/nco.h"
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#include "dsp/interpolator.h"
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#include "dsp/lowpass.h"
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#include "dsp/movingaverage.h"
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#include "audio/audiofifo.h"
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#include "util/message.h"
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class AudioFifo;
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class NFMDemod : public SampleSink {
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public:
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NFMDemod(AudioFifo* audioFifo, SampleSink* sampleSink);
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~NFMDemod();
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void configure(MessageQueue* messageQueue, Real rfBandwidth, Real afBandwidth, Real volume, Real squelch);
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void feed(SampleVector::const_iterator begin, SampleVector::const_iterator end, bool positiveOnly);
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void start();
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void stop();
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bool handleMessage(Message* cmd);
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private:
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class MsgConfigureNFMDemod : public Message {
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MESSAGE_CLASS_DECLARATION
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public:
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Real getRFBandwidth() const { return m_rfBandwidth; }
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Real getAFBandwidth() const { return m_afBandwidth; }
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Real getVolume() const { return m_volume; }
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Real getSquelch() const { return m_squelch; }
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static MsgConfigureNFMDemod* create(Real rfBandwidth, Real afBandwidth, Real volume, Real squelch)
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{
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return new MsgConfigureNFMDemod(rfBandwidth, afBandwidth, volume, squelch);
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}
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private:
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Real m_rfBandwidth;
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Real m_afBandwidth;
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Real m_volume;
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Real m_squelch;
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MsgConfigureNFMDemod(Real rfBandwidth, Real afBandwidth, Real volume, Real squelch) :
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Message(),
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m_rfBandwidth(rfBandwidth),
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m_afBandwidth(afBandwidth),
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m_volume(volume),
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m_squelch(squelch)
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{ }
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};
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struct AudioSample {
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qint16 l;
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qint16 r;
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};
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typedef std::vector<AudioSample> AudioVector;
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Real m_rfBandwidth;
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Real m_volume;
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Real m_squelchLevel;
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int m_sampleRate;
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int m_frequency;
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NCO m_nco;
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Interpolator m_interpolator;
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Real m_sampleDistanceRemain;
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Lowpass<Real> m_lowpass;
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int m_squelchState;
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int m_framedrop;
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double m_scale;
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Complex m_last, m_this;
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MovingAverage m_movingAverage;
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AudioVector m_audioBuffer;
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uint m_audioBufferFill;
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SampleSink* m_sampleSink;
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SampleVector m_sampleBuffer;
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AudioFifo* m_audioFifo;
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};
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#endif // INCLUDE_NFMDEMOD_H
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