95 lines
2.3 KiB
Plaintext
95 lines
2.3 KiB
Plaintext
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#ifndef MODULATOR_HPP__
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#define MODULATOR_HPP__
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#include <QAudio>
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#include <QPointer>
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#include "AudioDevice.hpp"
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class SoundOutput;
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//
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// Input device that generates PCM audio frames that encode a message
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// and an optional CW ID.
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//
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// Output can be muted while underway, preserving waveform timing when
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// transmission is resumed.
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//
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class Modulator
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: public AudioDevice
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{
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Q_OBJECT;
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public:
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enum ModulatorState {Synchronizing, Active, Idle};
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Modulator (unsigned frameRate, unsigned periodLengthInSeconds, QObject * parent = nullptr);
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void close () override;
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bool isTuning () const {return m_tuning;}
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double frequency () const {return m_frequency;}
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bool isActive () const {return m_state != Idle;}
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void setSpread(double s) {m_fSpread=s;}
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void setPeriod(unsigned p) {m_period=p;}
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void set_nsym(int n) {m_symbolsLength=n;}
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Q_SLOT void start (unsigned symbolsLength, double framesPerSymbol, double frequency,
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double toneSpacing, SoundOutput *, Channel = Mono,
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bool synchronize = true, bool fastMode = false,
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double dBSNR = 99., int TRperiod=60);
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Q_SLOT void stop (bool quick = false);
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Q_SLOT void tune (bool newState = true);
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Q_SLOT void setFrequency (double newFrequency) {m_frequency = newFrequency;}
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Q_SIGNAL void stateChanged (ModulatorState) const;
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protected:
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qint64 readData (char * data, qint64 maxSize) override;
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qint64 writeData (char const * /* data */, qint64 /* maxSize */) override
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{
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return -1; // we don't consume data
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}
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private:
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qint16 postProcessSample (qint16 sample) const;
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QPointer<SoundOutput> m_stream;
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bool m_quickClose;
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unsigned m_symbolsLength;
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static double constexpr m_twoPi = 2.0 * 3.141592653589793238462;
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unsigned m_nspd = 2048 + 512; // CW ID WPM factor = 22.5 WPM
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double m_phi;
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double m_dphi;
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double m_amp;
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double m_nsps;
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double volatile m_frequency;
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double m_frequency0;
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double m_snr;
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double m_fac;
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double m_toneSpacing;
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double m_fSpread;
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qint64 m_silentFrames;
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qint32 m_TRperiod;
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qint16 m_ramp;
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unsigned m_frameRate;
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unsigned m_period;
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ModulatorState volatile m_state;
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bool volatile m_tuning;
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bool m_addNoise;
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bool m_bFastMode;
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bool m_cwLevel;
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unsigned m_ic;
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unsigned m_isym0;
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int m_j0;
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double m_toneFrequency0;
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};
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#endif
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