sdrangel/plugins/channelrx/demodradiosonde/radiosondedemodsink.h

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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2019 Edouard Griffiths, F4EXB //
// Copyright (C) 2021 Jon Beniston, M7RCE //
// //
// 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_RADIOSONDEDEMODSINK_H
#define INCLUDE_RADIOSONDEDEMODSINK_H
#include <QVector>
#include "dsp/channelsamplesink.h"
#include "dsp/phasediscri.h"
#include "dsp/nco.h"
#include "dsp/interpolator.h"
#include "dsp/firfilter.h"
#include "dsp/gaussian.h"
#include "util/movingaverage.h"
#include "util/doublebufferfifo.h"
#include "util/messagequeue.h"
#include "util/crc.h"
#include "radiosondedemodsettings.h"
// Length of preamble (40 bytes) and frame (std 320 bytes - extended 518)
#define RADIOSONDEDEMOD_MAX_BYTES (40+518)
class ChannelAPI;
class RadiosondeDemod;
class ScopeVis;
class RadiosondeDemodSink : public ChannelSampleSink {
public:
RadiosondeDemodSink(RadiosondeDemod *radiosondeDemod);
~RadiosondeDemodSink();
virtual void feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end);
void setScopeSink(ScopeVis* scopeSink) { m_scopeSink = scopeSink; }
void applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force = false);
void applySettings(const RadiosondeDemodSettings& settings, bool force = false);
void setMessageQueueToChannel(MessageQueue *messageQueue) { m_messageQueueToChannel = messageQueue; }
void setChannel(ChannelAPI *channel) { m_channel = channel; }
double getMagSq() const { return m_magsq; }
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;
}
private:
struct MagSqLevelsStore
{
MagSqLevelsStore() :
m_magsq(1e-12),
m_magsqPeak(1e-12)
{}
double m_magsq;
double m_magsqPeak;
};
ScopeVis* m_scopeSink; // Scope GUI to display baseband waveform
RadiosondeDemod *m_radiosondeDemod;
RadiosondeDemodSettings m_settings;
ChannelAPI *m_channel;
int m_channelSampleRate;
int m_channelFrequencyOffset;
int m_samplesPerSymbol; // Number of samples per symbol
NCO m_nco;
Interpolator m_interpolator;
Real m_interpolatorDistance;
Real m_interpolatorDistanceRemain;
double m_magsq;
double m_magsqSum;
double m_magsqPeak;
int m_magsqCount;
MagSqLevelsStore m_magSqLevelStore;
MessageQueue *m_messageQueueToChannel;
MovingAverageUtil<Real, double, 16> m_movingAverage;
Lowpass<Complex> m_lowpass; // RF input filter
PhaseDiscriminators m_phaseDiscri; // FM demodulator
Gaussian<Real> m_pulseShape; // Pulse shaping filter
Real *m_rxBuf; // Receive sample buffer, large enough for one max length messsage
int m_rxBufLength; // Size in elements in m_rxBuf
int m_rxBufIdx; // Index in to circular buffer
int m_rxBufCnt; // Number of valid samples in buffer
Real *m_train; // Training sequence to look for
int m_correlationLength;
unsigned char m_bytes[RADIOSONDEDEMOD_MAX_BYTES];
crc16ccitt m_crc;
QVector<qint16> m_demodBuffer;
int m_demodBufferFill;
SampleVector m_sampleBuffer;
static const int m_sampleBufferSize = RadiosondeDemodSettings::RADIOSONDEDEMOD_CHANNEL_SAMPLE_RATE / 20;
int m_sampleBufferIndex;
static const uint8_t m_descramble[64];
MessageQueue *getMessageQueueToChannel() { return m_messageQueueToChannel; }
void processOneSample(Complex &ci);
Real correlate(int idx) const;
bool processFrame(int length, float corr, int sampleIdx);
int reedSolomonErrorCorrection();
bool checkCRCs(int length);
void sampleToScope(Complex sample);
};
#endif // INCLUDE_RADIOSONDEDEMODSINK_H