mirror of
https://github.com/f4exb/sdrangel.git
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228 lines
6.2 KiB
C++
228 lines
6.2 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2015 F4EXB //
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// written by Edouard Griffiths //
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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_BFMDEMOD_H
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#define INCLUDE_BFMDEMOD_H
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#include <QMutex>
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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 "dsp/fftfilt.h"
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#include "dsp/phaselock.h"
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#include "dsp/filterrc.h"
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#include "dsp/phasediscri.h"
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#include "audio/audiofifo.h"
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#include "util/message.h"
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#include "rdsdemod.h"
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#include "rdsdecoder.h"
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class RDSParser;
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class BFMDemod : public SampleSink {
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public:
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BFMDemod(SampleSink* sampleSink, RDSParser* rdsParser);
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virtual ~BFMDemod();
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void configure(MessageQueue* messageQueue,
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Real rfBandwidth,
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Real afBandwidth,
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Real volume,
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Real squelch,
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bool audioStereo,
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bool lsbStereo,
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bool showPilot,
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bool rdsActive);
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int getSampleRate() const { return m_config.m_inputSampleRate; }
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virtual void feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end, bool po);
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virtual void start();
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virtual void stop();
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virtual bool handleMessage(const Message& cmd);
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Real getMagSq() const { return m_movingAverage.average(); }
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bool getPilotLock() const { return m_pilotPLL.locked(); }
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Real getPilotLevel() const { return m_pilotPLL.get_pilot_level(); }
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Real getDecoderQua() const { return m_rdsDecoder.m_qua; }
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bool getDecoderSynced() const { return m_rdsDecoder.synced(); }
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Real getDemodAcc() const { return m_rdsDemod.m_report.acc; }
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Real getDemodQua() const { return m_rdsDemod.m_report.qua; }
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Real getDemodFclk() const { return m_rdsDemod.m_report.fclk; }
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private:
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class MsgConfigureBFMDemod : 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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bool getAudioStereo() const { return m_audioStereo; }
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bool getLsbStereo() const { return m_lsbStereo; }
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bool getShowPilot() const { return m_showPilot; }
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bool getRDSActive() const { return m_rdsActive; }
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static MsgConfigureBFMDemod* create(Real rfBandwidth,
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Real afBandwidth,
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Real volume,
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Real squelch,
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bool audioStereo,
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bool lsbStereo,
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bool showPilot,
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bool rdsActive)
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{
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return new MsgConfigureBFMDemod(rfBandwidth,
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afBandwidth,
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volume,
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squelch,
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audioStereo,
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lsbStereo,
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showPilot,
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rdsActive);
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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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bool m_audioStereo;
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bool m_lsbStereo;
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bool m_showPilot;
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bool m_rdsActive;
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MsgConfigureBFMDemod(Real rfBandwidth,
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Real afBandwidth,
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Real volume,
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Real squelch,
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bool audioStereo,
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bool lsbStereo,
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bool showPilot,
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bool rdsActive) :
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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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m_audioStereo(audioStereo),
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m_lsbStereo(lsbStereo),
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m_showPilot(showPilot),
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m_rdsActive(rdsActive)
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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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enum RateState {
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RSInitialFill,
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RSRunning
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};
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struct Config {
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int m_inputSampleRate;
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qint64 m_inputFrequencyOffset;
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Real m_rfBandwidth;
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Real m_afBandwidth;
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Real m_squelch;
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Real m_volume;
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quint32 m_audioSampleRate;
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bool m_audioStereo;
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bool m_lsbStereo;
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bool m_showPilot;
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bool m_rdsActive;
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Config() :
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m_inputSampleRate(-1),
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m_inputFrequencyOffset(0),
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m_rfBandwidth(-1),
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m_afBandwidth(-1),
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m_squelch(0),
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m_volume(0),
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m_audioSampleRate(0),
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m_audioStereo(false),
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m_lsbStereo(false),
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m_showPilot(false),
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m_rdsActive(false)
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{ }
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};
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Config m_config;
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Config m_running;
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NCO m_nco;
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Interpolator m_interpolator; //!< Interpolator between fixed demod bandwidth and audio bandwidth (rational)
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Real m_interpolatorDistance;
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Real m_interpolatorDistanceRemain;
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Interpolator m_interpolatorStereo; //!< Twin Interpolator for stereo subcarrier
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Real m_interpolatorStereoDistance;
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Real m_interpolatorStereoDistanceRemain;
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Interpolator m_interpolatorRDS; //!< Twin Interpolator for stereo subcarrier
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Real m_interpolatorRDSDistance;
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Real m_interpolatorRDSDistanceRemain;
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Lowpass<Real> m_lowpass;
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fftfilt* m_rfFilter;
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static const int filtFftLen = 1024;
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Real m_squelchLevel;
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int m_squelchState;
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Real m_m1Arg; //!> x^-1 real sample
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MovingAverage<Real> 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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AudioFifo m_audioFifo;
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SampleVector m_sampleBuffer;
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QMutex m_settingsMutex;
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RDSPhaseLock m_pilotPLL;
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Real m_pilotPLLSamples[4];
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RDSDemod m_rdsDemod;
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RDSDecoder m_rdsDecoder;
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RDSParser *m_rdsParser;
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LowPassFilterRC m_deemphasisFilterX;
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LowPassFilterRC m_deemphasisFilterY;
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static const Real default_deemphasis;
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Real m_fmExcursion;
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static const int default_excursion = 750000; // +/- 75 kHz
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PhaseDiscriminators m_phaseDiscri;
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void apply();
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};
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#endif // INCLUDE_BFMDEMOD_H
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