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sdrangel/plugins/channeltx/modchirpchat/chirpchatmodsource.h
2020-11-14 11:13:32 +01:00

113 lines
4.6 KiB
C++

///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2020 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_CHIRPCHATMODSOURCE_H
#define INCLUDE_CHIRPCHATMODSOURCE_H
#include <QMutex>
#include "dsp/channelsamplesource.h"
#include "dsp/nco.h"
#include "dsp/interpolator.h"
#include "dsp/firfilter.h"
#include "util/movingaverage.h"
#include "chirpchatmodsettings.h"
class ChirpChatModSource : public ChannelSampleSource
{
public:
ChirpChatModSource();
virtual ~ChirpChatModSource();
virtual void pull(SampleVector::iterator begin, unsigned int nbSamples);
virtual void pullOne(Sample& sample);
virtual void prefetch(unsigned int nbSamples) { (void) nbSamples; }
double getMagSq() const { return m_magsq; }
void getLevels(qreal& rmsLevel, qreal& peakLevel, int& numSamples) const
{
rmsLevel = m_rmsLevel;
peakLevel = m_peakLevelOut;
numSamples = m_levelNbSamples;
}
void applySettings(const ChirpChatModSettings& settings, bool force = false);
void applyChannelSettings(int channelSampleRate, int bandwidth, int channelFrequencyOffset, bool force = false);
void setSymbols(const std::vector<unsigned short>& symbols);
bool getActive() const { return m_active; }
private:
enum ChirpChatState
{
ChirpChatStateIdle, //!< Quiet time
ChirpChatStatePreamble, //!< Transmit preamble
ChirpChatStateSyncWord, //!< Tramsmit sync word
ChirpChatStateSFD, //!< Transmit SFD
ChirpChatStatePayload //!< Tramsmoit payload
};
int m_channelSampleRate;
int m_channelFrequencyOffset;
int m_bandwidth;
ChirpChatModSettings m_settings;
ChirpChatState m_state;
double *m_phaseIncrements;
std::vector<unsigned short> m_symbols;
unsigned int m_fftLength; //!< chirp length in samples
unsigned int m_chirp; //!< actual chirp index in chirps table
unsigned int m_chirp0; //!< half index of chirp start in chirps table
unsigned int m_sampleCounter; //!< actual sample counter
unsigned int m_fftCounter; //!< chirp sample counter
unsigned int m_chirpCount; //!< chirp or quarter chirp counter
unsigned int m_quietSamples; //!< number of samples during quiet period
unsigned int m_quarterSamples; //!< number of samples in a quarter chirp
unsigned int m_repeatCount; //!< message repetition counter
bool m_active; //!< modulator is in a sending sequence (icluding periodic quiet times)
NCO m_carrierNco;
double m_modPhasor; //!< baseband modulator phasor
Complex m_modSample;
Interpolator m_interpolator;
Real m_interpolatorDistance;
Real m_interpolatorDistanceRemain;
bool m_interpolatorConsumed;
Bandpass<Real> m_bandpass;
double m_magsq;
MovingAverageUtil<double, double, 16> m_movingAverage;
quint32 m_levelCalcCount;
qreal m_rmsLevel;
qreal m_peakLevelOut;
Real m_peakLevel;
Real m_levelSum;
static const int m_levelNbSamples;
void initSF(unsigned int sf); //!< Init tables, FFTs, depending on spread factor
void initTest(unsigned int sf, unsigned int deBits);
void reset();
void calculateLevel(Real& sample);
void modulateSample();
unsigned short encodeSymbol(unsigned short symbol); //!< Encodes symbol with possible DE bits spacing
};
#endif // INCLUDE_CHIRPCHATMODSOURCE_H