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sdrangel/plugins/channel/wfm/wfmdemod.h

137 lines
4.0 KiB
C++

///////////////////////////////////////////////////////////////////////////////////
// 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_WFMDEMOD_H
#define INCLUDE_WFMDEMOD_H
#include <QMutex>
#include <vector>
#include "dsp/samplesink.h"
#include "dsp/nco.h"
#include "dsp/interpolator.h"
#include "dsp/lowpass.h"
#include "dsp/movingaverage.h"
#include "dsp/fftfilt.h"
#include "audio/audiofifo.h"
#include "util/message.h"
#define rfFilterFftLength 1024
class WFMDemod : public SampleSink {
public:
WFMDemod(SampleSink* sampleSink);
virtual ~WFMDemod();
void configure(MessageQueue* messageQueue, Real rfBandwidth, Real afBandwidth, Real volume, Real squelch);
virtual void feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end, bool po);
virtual void start();
virtual void stop();
virtual bool handleMessage(const Message& cmd);
private:
class MsgConfigureWFMDemod : public Message {
MESSAGE_CLASS_DECLARATION
public:
Real getRFBandwidth() const { return m_rfBandwidth; }
Real getAFBandwidth() const { return m_afBandwidth; }
Real getVolume() const { return m_volume; }
Real getSquelch() const { return m_squelch; }
static MsgConfigureWFMDemod* create(Real rfBandwidth, Real afBandwidth, Real volume, Real squelch)
{
return new MsgConfigureWFMDemod(rfBandwidth, afBandwidth, volume, squelch);
}
private:
Real m_rfBandwidth;
Real m_afBandwidth;
Real m_volume;
Real m_squelch;
MsgConfigureWFMDemod(Real rfBandwidth, Real afBandwidth, Real volume, Real squelch) :
Message(),
m_rfBandwidth(rfBandwidth),
m_afBandwidth(afBandwidth),
m_volume(volume),
m_squelch(squelch)
{ }
};
struct AudioSample {
qint16 l;
qint16 r;
};
typedef std::vector<AudioSample> AudioVector;
enum RateState {
RSInitialFill,
RSRunning
};
struct Config {
int m_inputSampleRate;
qint64 m_inputFrequencyOffset;
Real m_rfBandwidth;
Real m_afBandwidth;
Real m_squelch;
Real m_volume;
quint32 m_audioSampleRate;
Config() :
m_inputSampleRate(-1),
m_inputFrequencyOffset(0),
m_rfBandwidth(-1),
m_afBandwidth(-1),
m_squelch(0),
m_volume(0),
m_audioSampleRate(0)
{ }
};
Config m_config;
Config m_running;
NCO m_nco;
Interpolator m_interpolator; //!< Interpolator between sample rate sent from DSP engine and requested RF bandwidth (rational)
Real m_interpolatorDistance;
Real m_interpolatorDistanceRemain;
Lowpass<Real> m_lowpass;
fftfilt* m_rfFilter;
Real m_squelchLevel;
int m_squelchState;
Real m_lastArgument;
Complex m_m1Sample; //!< x^-1 sample
Complex m_m2Sample; //!< x^-1 sample
MovingAverage<Real> m_movingAverage;
AudioVector m_audioBuffer;
uint m_audioBufferFill;
SampleSink* m_sampleSink;
AudioFifo m_audioFifo;
SampleVector m_sampleBuffer;
QMutex m_settingsMutex;
void apply();
};
#endif // INCLUDE_WFMDEMOD_H