WSJT-X/Modulator.hpp
Joe Taylor 7fe8901149 Merge changes from branches/wsjtx_w back into branches/wsjtx.
Note to developers: Not sure about the makefiles...


git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@3835 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
2014-03-05 18:20:40 +00:00

97 lines
2.4 KiB
C++

#ifndef MODULATOR_HPP__
#define MODULATOR_HPP__
#include "AudioDevice.hpp"
#ifdef UNIX
# define NUM_CHANNELS 2
#else
# define NUM_CHANNELS 1
#endif
//
// Input device that generates PCM audio frames that encode a message
// and an optional CW ID.
//
// Output can be muted while underway, preserving waveform timing when
// transmission is resumed.
//
class Modulator : public AudioDevice
{
Q_OBJECT;
Q_PROPERTY (unsigned frequency READ frequency WRITE setFrequency);
Q_PROPERTY (bool tuning READ isTuning WRITE tune);
Q_PROPERTY (bool muted READ isMuted WRITE mute);
public:
enum ModulatorState {Synchronizing, Active, Idle};
Modulator (unsigned frameRate, unsigned periodLengthInSeconds, QObject * parent = 0);
Q_SLOT void open (unsigned symbolsLength, double framesPerSymbol, unsigned frequency, AudioDevice::Channel, bool synchronize = true, double dBSNR = 99.);
bool isTuning () const {return m_tuning;}
bool isMuted () const {return m_muted;}
unsigned frequency () const {return m_frequency;}
bool isActive () const {return m_state != Idle;}
void setWide9(double d1, double d2) {m_toneSpacing=d1; m_fSpread=d2;}
protected:
qint64 readData (char * data, qint64 maxSize);
qint64 writeData (char const * /* data */, qint64 /* maxSize */)
{
return -1; // we don't consume data
}
private:
/* private because we epect to run in a thread and don't want direct
C++ calls made, instead they must be invoked via the Qt
signal/slot mechanism which is thread safe */
Q_SLOT void close ()
{
Q_EMIT stateChanged ((m_state = Idle));
AudioDevice::close ();
}
Q_SLOT void tune (bool newState = true) {m_tuning = newState;}
Q_SLOT void mute (bool newState = true) {m_muted = newState;}
Q_SLOT void setFrequency (unsigned newFrequency) {m_frequency = newFrequency;}
Q_SIGNAL void stateChanged (ModulatorState);
private:
qint16 postProcessSample (qint16 sample) const;
unsigned m_symbolsLength;
static double const m_twoPi;
static unsigned const m_nspd; // CW ID WPM factor
double m_phi;
double m_dphi;
double m_amp;
double m_nsps;
double volatile m_frequency;
double m_snr;
double m_fac;
double m_toneSpacing;
double m_fSpread;
qint64 m_silentFrames;
qint64 m_framesSent;
int m_frameRate;
int m_period;
ModulatorState volatile m_state;
bool volatile m_tuning;
bool volatile m_muted;
bool m_addNoise;
unsigned m_ic;
unsigned m_isym0;
qint16 m_ramp;
};
#endif