implementation for high precision timer
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2 changed files with 61 additions and 22 deletions
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@ -26,8 +26,7 @@
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// CHighPrecisionTimer implementation ******************************************
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CHighPrecisionTimer::CHighPrecisionTimer ( const int iFrameSize,
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const int iSampleRate )
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CHighPrecisionTimer::CHighPrecisionTimer()
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{
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// add some error checking, the high precision timer implementation only
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// supports 128 and 256 samples frame size at 48 kHz sampling rate
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@ -38,18 +37,32 @@ CHighPrecisionTimer::CHighPrecisionTimer ( const int iFrameSize,
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# error "Only a system sample rate of 48 kHz is supported by this module"
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#endif
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/*
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// init timer stuff
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//vTimeOutIntervals = [0 ]
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// for 128 sample frame size at 48 kHz sampling rate:
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// actual intervals: 0.0 2.666 5.333 8.0
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// quantized to 1 ms: 0 3 5 8 (0)
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// for 256 sample frame size at 48 kHz sampling rate:
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// actual intervals: 0.0 5.333 10.666 16.0
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// quantized to 1 ms: 0 5 11 16 (0)
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*/
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// Since QT only supports a minimum timer resolution of 1 ms but for our
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// llcon server we require a timer interval of 2.333 ms for 128 samples
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// frame size and 5.666 ms for 256 samples frame size at 48 kHz sampling
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// rate.
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// To support this interval, we use a timer at the minimum supported
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// resolution and fire the actual frame timer if the error to the actual
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// required interval is minimum.
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veciTimeOutIntervals.Init ( 3 );
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if ( SYSTEM_BLOCK_FRAME_SAMPLES == 128 )
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{
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// for 128 sample frame size at 48 kHz sampling rate:
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// actual intervals: 0.0 2.666 5.333 8.0
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// quantized to 1 ms: 0 3 5 8 (0)
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veciTimeOutIntervals[0] = 3;
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veciTimeOutIntervals[1] = 2;
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veciTimeOutIntervals[2] = 3;
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}
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else
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{
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// for 256 sample frame size at 48 kHz sampling rate:
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// actual intervals: 0.0 5.333 10.666 16.0
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// quantized to 1 ms: 0 5 11 16 (0)
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veciTimeOutIntervals[0] = 5;
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veciTimeOutIntervals[1] = 6;
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veciTimeOutIntervals[2] = 5;
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}
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// connect timer timeout signal
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QObject::connect ( &Timer, SIGNAL ( timeout() ),
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@ -58,21 +71,45 @@ CHighPrecisionTimer::CHighPrecisionTimer ( const int iFrameSize,
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void CHighPrecisionTimer::start()
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{
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// TODO
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// reset position pointer and counter
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iCurPosInVector = 0;
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iIntervalCounter = 0;
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// start internal timer with lowest possible resolution
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Timer.start ( MIN_TIMER_RESOLUTION_MS );
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}
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void CHighPrecisionTimer::stop()
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{
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// TODO
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// stop timer
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Timer.stop();
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}
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void CHighPrecisionTimer::OnTimer()
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{
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// TODO
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emit timeout();
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// check if maximum number of high precision timer intervals are
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// finished
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if ( veciTimeOutIntervals[iCurPosInVector] == iIntervalCounter )
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{
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// reset interval counter
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iIntervalCounter = 0;
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// go to next position in vector, take care of wrap around
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iCurPosInVector++;
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if ( iCurPosInVector == veciTimeOutIntervals.Size() )
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{
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iCurPosInVector = 0;
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}
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// minimum time error to actual required timer interval is reached,
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// emit signal for server
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emit timeout();
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}
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else
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{
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// next high precision timer interval
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iIntervalCounter++;
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}
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}
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@ -83,8 +120,7 @@ CServer::CServer ( const QString& strLoggingFileName,
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const QString& strHistoryFileName,
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const QString& strServerNameForHTMLStatusFile ) :
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Socket ( this, iPortNumber ),
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bWriteStatusHTMLFile ( false ),
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HighPrecisionTimer ( SYSTEM_BLOCK_FRAME_SAMPLES, SYSTEM_SAMPLE_RATE )
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bWriteStatusHTMLFile ( false )
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{
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// enable all channels (for the server all channel must be enabled the
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// entire life time of the software
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@ -51,14 +51,17 @@ class CHighPrecisionTimer : public QObject
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Q_OBJECT
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public:
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CHighPrecisionTimer ( const int iFrameSize, const int iSampleRate );
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CHighPrecisionTimer();
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void start();
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void stop();
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bool isActive() const { return Timer.isActive(); }
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protected:
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QTimer Timer;
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QTimer Timer;
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CVector<int> veciTimeOutIntervals;
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int iCurPosInVector;
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int iIntervalCounter;
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public slots:
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void OnTimer();
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