WSJT-X/Detector.hpp
Bill Somerville 34f8924cfc Reintegrate the wsjtx_exp branch into the trunk
This  merge brings  the WSPR  feature development  into the  main line
ready for release in a future v1.6 release.



git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@5424 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
2015-05-27 13:08:28 +00:00

59 lines
1.5 KiB
C++

#ifndef DETECTOR_HPP__
#define DETECTOR_HPP__
#include "AudioDevice.hpp"
#include <QScopedArrayPointer>
//
// output device that distributes data in predefined chunks via a signal
//
// the underlying device for this abstraction is just the buffer that
// stores samples throughout a receiving period
//
class Detector : public AudioDevice
{
Q_OBJECT;
public:
//
// if the data buffer were not global storage and fixed size then we
// might want maximum size passed as constructor arguments
//
// we down sample by a factor of 4
//
// the samplesPerFFT argument is the number after down sampling
//
Detector (unsigned frameRate, unsigned periodLengthInSeconds, unsigned samplesPerFFT, unsigned downSampleFactor = 4u, QObject * parent = 0);
Q_SIGNAL void framesWritten (qint64) const;
void setPeriod(unsigned p) {m_period=p;}
bool reset () override;
protected:
qint64 readData (char * /* data */, qint64 /* maxSize */)
{
return -1; // we don't produce data
}
qint64 writeData (char const * data, qint64 maxSize);
private:
void clear (); // discard buffer contents
unsigned secondInPeriod () const;
unsigned m_frameRate;
unsigned m_period;
unsigned m_downSampleFactor;
qint32 m_samplesPerFFT; // after any down sampling
qint32 m_ns;
QScopedArrayPointer<short> m_buffer; // de-interleaved sample buffer
// big enough for all the
// samples for one increment of
// data (a signals worth) at
// the input sample rate
unsigned m_bufferPos;
};
#endif