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https://github.com/saitohirga/WSJT-X.git
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c3d1eb5cee
In an effort to reduce the processing overhead when transmitting I have suspended the audio input stream at source instead of the prior behavior that simply idled skipping received samples. This is in response to high activity levels, especially with JTAlert also running, when decode processing rolls over into the next TX period. Tests show a reduction in CPU loading from ~5% to ~1.5% in the above scenario. Hopefully this will reduce the likelyhood of TX audio glitches when other system activity spikes. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@3986 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
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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