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129 lines
5.1 KiB
C++
129 lines
5.1 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2019 Edouard Griffiths, F4EXB //
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// Copyright (C) 2020 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_ADSBDEMODSINK_H
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#define INCLUDE_ADSBDEMODSINK_H
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#define BOOST_CHRONO_HEADER_ONLY
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#include <boost/chrono/chrono.hpp>
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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 "adsbdemodsettings.h"
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#include "adsbdemodsinkworker.h"
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class ADSBDemodSink : public ChannelSampleSink {
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public:
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ADSBDemodSink();
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~ADSBDemodSink();
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virtual void feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end);
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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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void applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force = false);
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void applySettings(const ADSBDemodSettings& settings, bool force = false);
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void setMessageQueueToGUI(MessageQueue *messageQueue) { m_messageQueueToGUI = messageQueue; }
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void setMessageQueueToWorker(MessageQueue *messageQueue) { m_messageQueueToWorker = messageQueue; }
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void startWorker();
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void stopWorker();
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private:
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friend ADSBDemodSinkWorker;
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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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int m_channelSampleRate;
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int m_channelFrequencyOffset;
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ADSBDemodSettings m_settings;
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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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boost::chrono::steady_clock::time_point m_startPoint;
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double m_feedTime; //!< Time spent in feed()
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// Triple buffering for sharing sample data between two threads
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// Top area of each buffer is not used by writer, as it's used by the reader
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// for copying the last few samples of the previous buffer, so it can
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// be processed contiguously
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static const int m_buffers = 3;
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static const int m_bufferSize = 200000;
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Real *m_sampleBuffer[3]; //!< Each buffer is m_bufferSize samples
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QSemaphore m_bufferWrite[3]; //!< Semaphore to control write access to the buffers
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QSemaphore m_bufferRead[3]; //!< Semaphore to control read access from the buffers
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QDateTime m_bufferFirstSampleDateTime[3]; //!< Time for first sample in the buffer
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bool m_bufferDateTimeValid[3];
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ADSBDemodSinkWorker m_worker; //!< Worker thread that does the actual demodulation
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int m_writeBuffer; //!< Which of the 3 buffers we're writing in to
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int m_writeIdx; //!< Index to to current write buffer
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// These values are derived from samplesPerBit
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int m_samplesPerFrame; //!< Including preamble
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int m_samplesPerChip;
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double m_magsq; //!< displayed averaged value
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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_messageQueueToGUI;
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MessageQueue *m_messageQueueToWorker;
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void init(int samplesPerBit);
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Real inline complexMagSq(Complex& ci)
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{
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double magsqRaw = ci.real()*ci.real() + ci.imag()*ci.imag();
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return (Real)(magsqRaw / (SDR_RX_SCALED*SDR_RX_SCALED));
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}
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void processOneSample(Real magsq);
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MessageQueue *getMessageQueueToGUI() { return m_messageQueueToGUI; }
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MessageQueue *getMessageQueueToWorker() { return m_messageQueueToWorker; }
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};
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#endif // INCLUDE_ADSBDEMODSINK_H
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