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146 lines
4.9 KiB
C++
146 lines
4.9 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2019 Edouard Griffiths, F4EXB //
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// Copyright (C) 2023 Jon Beniston, M7RCE //
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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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// (at your option) any later version. //
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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_NAVTEXDEMODSINK_H
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#define INCLUDE_NAVTEXDEMODSINK_H
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#include <QVector>
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#include "dsp/channelsamplesink.h"
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#include "dsp/nco.h"
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#include "dsp/interpolator.h"
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#include "dsp/firfilter.h"
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#include "util/movingaverage.h"
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#include "util/movingmaximum.h"
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#include "util/messagequeue.h"
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#include "util/navtex.h"
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#include "navtexdemodsettings.h"
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class ChannelAPI;
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class NavtexDemod;
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class ScopeVis;
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class NavtexDemodSink : public ChannelSampleSink {
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public:
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NavtexDemodSink(NavtexDemod *packetDemod);
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~NavtexDemodSink();
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virtual void feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end);
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void setScopeSink(ScopeVis* scopeSink) { m_scopeSink = scopeSink; }
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void applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force = false);
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void applySettings(const NavtexDemodSettings& settings, bool force = false);
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void setMessageQueueToChannel(MessageQueue *messageQueue) { m_messageQueueToChannel = messageQueue; }
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void setChannel(ChannelAPI *channel) { m_channel = channel; }
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double getMagSq() const { return m_magsq; }
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void getMagSqLevels(double& avg, double& peak, int& nbSamples)
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{
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if (m_magsqCount > 0)
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{
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m_magsq = m_magsqSum / m_magsqCount;
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m_magSqLevelStore.m_magsq = m_magsq;
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m_magSqLevelStore.m_magsqPeak = m_magsqPeak;
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}
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avg = m_magSqLevelStore.m_magsq;
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peak = m_magSqLevelStore.m_magsqPeak;
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nbSamples = m_magsqCount == 0 ? 1 : m_magsqCount;
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m_magsqSum = 0.0f;
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m_magsqPeak = 0.0f;
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m_magsqCount = 0;
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}
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private:
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struct MagSqLevelsStore
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{
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MagSqLevelsStore() :
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m_magsq(1e-12),
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m_magsqPeak(1e-12)
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{}
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double m_magsq;
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double m_magsqPeak;
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};
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ScopeVis* m_scopeSink; // Scope GUI to display baseband waveform
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NavtexDemod *m_navtexDemod;
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NavtexDemodSettings m_settings;
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ChannelAPI *m_channel;
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int m_channelSampleRate;
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int m_channelFrequencyOffset;
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NCO m_nco;
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Interpolator m_interpolator;
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Real m_interpolatorDistance;
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Real m_interpolatorDistanceRemain;
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double m_magsq;
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double m_magsqSum;
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double m_magsqPeak;
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int m_magsqCount;
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MagSqLevelsStore m_magSqLevelStore;
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MessageQueue *m_messageQueueToChannel;
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MovingAverageUtil<Real, double, 16> m_movingAverage;
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Lowpass<Complex> m_lowpassComplex1;
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Lowpass<Complex> m_lowpassComplex2;
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MovingMaximum<Real> m_movMax1;
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MovingMaximum<Real> m_movMax2;
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static const int m_expLength = 600;
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static const int m_samplesPerBit = NavtexDemodSettings::NAVTEXDEMOD_CHANNEL_SAMPLE_RATE / NavtexDemodSettings::NAVTEXDEMOD_BAUD_RATE;
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Complex *m_exp;
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int m_expIdx;
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int m_bit;
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bool m_data;
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bool m_dataPrev;
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int m_clockCount;
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bool m_clock;
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double m_rssiMagSqSum;
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int m_rssiMagSqCount;
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unsigned short m_bits;
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int m_bitCount;
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bool m_gotSOP;
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int m_errorCount;
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int m_consecutiveErrors;
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QString m_messageBuffer;
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SitorBDecoder m_sitorBDecoder;
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SampleVector m_sampleBuffer;
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static const int m_sampleBufferSize = NavtexDemodSettings::NAVTEXDEMOD_CHANNEL_SAMPLE_RATE / 20;
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int m_sampleBufferIndex;
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void processOneSample(Complex &ci);
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MessageQueue *getMessageQueueToChannel() { return m_messageQueueToChannel; }
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void sampleToScope(Complex sample);
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void eraseChars(int n);
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void init();
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void receiveBit(bool bit);
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};
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#endif // INCLUDE_NAVTEXDEMODSINK_H
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