sdrangel/plugins/channelrx/demodbfm/bfmdemodsink.h

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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2019 Edouard Griffiths, F4EXB //
// //
// 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 //
// (at your option) any later version. //
// //
// 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_BFMDEMODSINK_H
#define INCLUDE_BFMDEMODSINK_H
#include <vector>
#include "dsp/channelsamplesink.h"
#include "dsp/nco.h"
#include "dsp/interpolator.h"
#include "dsp/firfilter.h"
#include "dsp/movingaverage.h"
#include "dsp/fftfilt.h"
#include "dsp/phaselock.h"
#include "dsp/filterrc.h"
#include "dsp/phasediscri.h"
#include "audio/audiofifo.h"
#include "rdsparser.h"
#include "rdsdecoder.h"
#include "rdsdemod.h"
#include "bfmdemodsettings.h"
class BasebandSampleSink;
class BFMDemodSink : public ChannelSampleSink {
public:
BFMDemodSink();
~BFMDemodSink();
virtual void feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end);
void setSpectrumSink(BasebandSampleSink* spectrumSink) { m_spectrumSink = spectrumSink; }
double getMagSq() const { return m_magsq; }
bool getPilotLock() const { return m_pilotPLL.locked(); }
Real getPilotLevel() const { return m_pilotPLL.get_pilot_level(); }
Real getDecoderQua() const { return m_rdsDecoder.m_qua; }
bool getDecoderSynced() const { return m_rdsDecoder.synced(); }
Real getDemodAcc() const { return m_rdsDemod.m_report.acc; }
Real getDemodQua() const { return m_rdsDemod.m_report.qua; }
Real getDemodFclk() const { return m_rdsDemod.m_report.fclk; }
int getSquelchState() const { return m_squelchState; }
void getMagSqLevels(double& avg, double& peak, int& nbSamples)
{
if (m_magsqCount > 0)
{
m_magsq = m_magsqSum / m_magsqCount;
m_magSqLevelStore.m_magsq = m_magsq;
m_magSqLevelStore.m_magsqPeak = m_magsqPeak;
}
avg = m_magSqLevelStore.m_magsq;
peak = m_magSqLevelStore.m_magsqPeak;
nbSamples = m_magsqCount == 0 ? 1 : m_magsqCount;
m_magsqSum = 0.0f;
m_magsqPeak = 0.0f;
m_magsqCount = 0;
}
RDSParser& getRDSParser() { return m_rdsParser; }
void applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force = false);
void applySettings(const BFMDemodSettings& settings, bool force = false);
AudioFifo *getAudioFifo() { return &m_audioFifo; }
void applyAudioSampleRate(int sampleRate);
int getAudioSampleRate() const { return m_audioSampleRate; }
private:
struct MagSqLevelsStore
{
MagSqLevelsStore() :
m_magsq(1e-12),
m_magsqPeak(1e-12)
{}
double m_magsq;
double m_magsqPeak;
};
enum RateState {
RSInitialFill,
RSRunning
};
int m_channelSampleRate;
int m_channelFrequencyOffset;
BFMDemodSettings m_settings;
int m_audioSampleRate;
AudioVector m_audioBuffer;
uint m_audioBufferFill;
AudioFifo m_audioFifo;
SampleVector m_sampleBuffer;
NCO m_nco;
Interpolator m_interpolator; //!< Interpolator between fixed demod bandwidth and audio bandwidth (rational)
Real m_interpolatorDistance;
Real m_interpolatorDistanceRemain;
Interpolator m_interpolatorStereo; //!< Twin Interpolator for stereo subcarrier
Real m_interpolatorStereoDistance;
Real m_interpolatorStereoDistanceRemain;
Interpolator m_interpolatorRDS; //!< Twin Interpolator for stereo subcarrier
Real m_interpolatorRDSDistance;
Real m_interpolatorRDSDistanceRemain;
Lowpass<Real> m_lowpass;
fftfilt* m_rfFilter;
static const int filtFftLen = 1024;
Real m_squelchLevel;
int m_squelchState;
Real m_m1Arg; //!> x^-1 real sample
double m_magsq;
double m_magsqSum;
double m_magsqPeak;
int m_magsqCount;
MagSqLevelsStore m_magSqLevelStore;
RDSPhaseLock m_pilotPLL;
Real m_pilotPLLSamples[4];
RDSDemod m_rdsDemod;
RDSDecoder m_rdsDecoder;
RDSParser m_rdsParser;
LowPassFilterRC m_deemphasisFilterX;
LowPassFilterRC m_deemphasisFilterY;
static const Real default_deemphasis;
Real m_fmExcursion;
static const int default_excursion;
PhaseDiscriminators m_phaseDiscri;
BasebandSampleSink *m_spectrumSink;
};
#endif // INCLUDE_BFMDEMODSINK_H