sdrangel/plugins/channeltx/modrtty/rttymodsource.h

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5.1 KiB
C++

///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2020-2021, 2023 Jon Beniston, M7RCE <jon@beniston.com> //
// Copyright (C) 2020-2021 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
// //
// 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_RTTYMODSOURCE_H
#define INCLUDE_RTTYMODSOURCE_H
#include <QMutex>
#include <QDebug>
#include <QVector>
#include "dsp/channelsamplesource.h"
#include "dsp/nco.h"
#include "dsp/interpolator.h"
#include "dsp/firfilter.h"
#include "dsp/raisedcosine.h"
#include "util/movingaverage.h"
#include "util/baudot.h"
#include "rttymodsettings.h"
class BasebandSampleSink;
class ChannelAPI;
class RttyModSource : public ChannelSampleSource
{
public:
RttyModSource();
virtual ~RttyModSource();
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 setMessageQueueToGUI(MessageQueue* messageQueue) { m_messageQueueToGUI = messageQueue; }
void setSpectrumSink(BasebandSampleSink *sampleSink) { m_spectrumSink = sampleSink; }
void applySettings(const RttyModSettings& settings, bool force = false);
void applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force = false);
void addTXText(QString data);
void setChannel(ChannelAPI *channel) { m_channel = channel; }
int getChannelSampleRate() const { return m_channelSampleRate; }
private:
int m_channelSampleRate;
int m_channelFrequencyOffset;
int m_spectrumRate;
RttyModSettings m_settings;
ChannelAPI *m_channel;
NCO m_carrierNco;
double m_fmPhase; // Double gives cleaner spectrum than Real
double m_phaseSensitivity;
Real m_linearGain;
Complex m_modSample;
int m_bit; // Current bit
RaisedCosine<Real> m_pulseShape; // Pulse shaping filter
Lowpass<Complex> m_lowpass; // Low pass filter to limit RF bandwidth
BasebandSampleSink* m_spectrumSink; // Spectrum GUI to display baseband waveform
SampleVector m_specSampleBuffer;
static const int m_specSampleBufferSize = 256;
int m_specSampleBufferIndex;
Interpolator m_interpolator; // Interpolator to downsample to spectrum
Real m_interpolatorDistance;
Real m_interpolatorDistanceRemain;
bool m_interpolatorConsumed;
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 = 480; // every 10ms assuming 48k Sa/s
int m_sampleIdx; // Sample index in to symbol
int m_samplesPerSymbol; // Number of samples per symbol
QString m_textToTransmit; // Transmit buffer (before RTTY encoding)
BaudotEncoder m_rttyEncoder;
QList<uint8_t> m_bits; // Bits to transmit
int m_byteIdx; // Index in to m_bits
int m_bitIdx; // Index in to current byte of m_bits
int m_bitCount; // Count of number of valid bits in m_bits
int m_bitCountTotal;
QVector<qint16> m_demodBuffer;
int m_demodBufferFill;
MessageQueue* m_messageQueueToGUI;
MessageQueue* getMessageQueueToGUI() { return m_messageQueueToGUI; }
void encodeText(const QString& data);
int getBit(); // Get bit from m_bits
void addBit(int bit); // Add bit to m_bits, with zero stuffing
void initTX();
void calculateLevel(Real& sample);
void modulateSample();
void sampleToSpectrum(Complex sample);
};
#endif // INCLUDE_RTTYMODSOURCE_H