sdrangel/plugins/channelrx/demodnfm/nfmdemod.h

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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 <dsp/basebandsamplesink.h>
#include <dsp/phasediscri.h>
#include <QMutex>
#include <vector>
#include "dsp/nco.h"
#include "dsp/interpolator.h"
#include "dsp/lowpass.h"
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#include "dsp/bandpass.h"
#include "dsp/afsquelch.h"
#include "dsp/agc.h"
#include "dsp/ctcssdetector.h"
#include "dsp/afsquelch.h"
#include "audio/audiofifo.h"
#include "util/message.h"
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#include "nfmdemodsettings.h"
class DeviceSourceAPI;
class ThreadedBasebandSampleSink;
class DownChannelizer;
class NFMDemod : public BasebandSampleSink {
public:
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class MsgConfigureNFMDemod : public Message {
MESSAGE_CLASS_DECLARATION
public:
const NFMDemodSettings& getSettings() const { return m_settings; }
bool getForce() const { return m_force; }
static MsgConfigureNFMDemod* create(const NFMDemodSettings& settings, bool force)
{
return new MsgConfigureNFMDemod(settings, force);
}
private:
NFMDemodSettings m_settings;
bool m_force;
MsgConfigureNFMDemod(const NFMDemodSettings& settings, bool force) :
Message(),
m_settings(settings),
m_force(force)
{ }
};
class MsgConfigureChannelizer : public Message {
MESSAGE_CLASS_DECLARATION
public:
int getSampleRate() const { return m_sampleRate; }
int getCenterFrequency() const { return m_centerFrequency; }
static MsgConfigureChannelizer* create(int sampleRate, int centerFrequency)
{
return new MsgConfigureChannelizer(sampleRate, centerFrequency);
}
private:
int m_sampleRate;
int m_centerFrequency;
MsgConfigureChannelizer(int sampleRate, int centerFrequency) :
Message(),
m_sampleRate(sampleRate),
m_centerFrequency(centerFrequency)
{ }
};
class MsgReportCTCSSFreq : public Message {
MESSAGE_CLASS_DECLARATION
public:
Real getFrequency() const { return m_freq; }
static MsgReportCTCSSFreq* create(Real freq)
{
return new MsgReportCTCSSFreq(freq);
}
private:
Real m_freq;
MsgReportCTCSSFreq(Real freq) :
Message(),
m_freq(freq)
{ }
};
NFMDemod(DeviceSourceAPI *deviceAPI);
~NFMDemod();
virtual void feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end, bool po);
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virtual void start();
virtual void stop();
virtual bool handleMessage(const Message& cmd);
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const Real *getCtcssToneSet(int& nbTones) const {
nbTones = m_ctcssDetector.getNTones();
return m_ctcssDetector.getToneSet();
}
void setSelectedCtcssIndex(int selectedCtcssIndex) {
m_ctcssIndexSelected = selectedCtcssIndex;
}
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Real getMag() { return m_magsq; }
bool getSquelchOpen() const { return m_squelchOpen; }
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void getMagSqLevels(double& avg, double& peak, int& nbSamples)
{
avg = m_magsqCount == 0 ? 1e-10 : m_magsqSum / m_magsqCount;
m_magsq = avg;
peak = m_magsqPeak == 0.0 ? 1e-10 : m_magsqPeak;
nbSamples = m_magsqCount == 0 ? 1 : m_magsqCount;
m_magsqSum = 0.0f;
m_magsqPeak = 0.0f;
m_magsqCount = 0;
}
private:
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enum RateState {
RSInitialFill,
RSRunning
};
DeviceSourceAPI* m_deviceAPI;
ThreadedBasebandSampleSink* m_threadedChannelizer;
DownChannelizer* m_channelizer;
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NFMDemodSettings m_settings;
NCO m_nco;
Interpolator m_interpolator;
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Real m_interpolatorDistance;
Real m_interpolatorDistanceRemain;
Lowpass<Real> m_lowpass;
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Bandpass<Real> m_bandpass;
CTCSSDetector m_ctcssDetector;
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int m_ctcssIndex; // 0 for nothing detected
int m_ctcssIndexSelected;
int m_sampleCount;
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int m_squelchCount;
int m_squelchGate;
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bool m_audioMute;
Real m_squelchLevel;
bool m_squelchOpen;
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bool m_afSquelchOpen;
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double m_magsq; //!< displayed averaged value
double m_magsqSum;
double m_magsqPeak;
int m_magsqCount;
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Real m_lastArgument;
//Complex m_m1Sample;
//Complex m_m2Sample;
MovingAverage<double> m_movingAverage;
AFSquelch m_afSquelch;
Real m_agcLevel; // AGC will aim to this level
Real m_agcFloor; // AGC will not go below this level
Real m_fmExcursion;
//Real m_fmScaling;
AudioVector m_audioBuffer;
uint m_audioBufferFill;
AudioFifo m_audioFifo;
UDPSink<qint16> *m_udpBufferAudio;
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QMutex m_settingsMutex;
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PhaseDiscriminators m_phaseDiscri;
static const int m_udpBlockSize;
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// void apply(bool force = false);
void applySettings(const NFMDemodSettings& settings, bool force = false);
};
#endif // INCLUDE_NFMDEMOD_H