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