mirror of
https://github.com/f4exb/sdrangel.git
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83 lines
3.3 KiB
C
83 lines
3.3 KiB
C
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///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2019 Edouard Griffiths, F4EXB //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#ifndef SDRBASE_DSP_SAMPLESOURCEFIFO_H_
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#define SDRBASE_DSP_SAMPLESOURCEFIFO_H_
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#include <QObject>
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#include <QMutex>
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#include "dsp/dsptypes.h"
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#include "export.h"
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class SDRBASE_API SampleSourceFifo : public QObject {
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Q_OBJECT
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public:
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SampleSourceFifo(QObject *parent = nullptr);
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SampleSourceFifo(unsigned int size, QObject *parent = nullptr);
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~SampleSourceFifo();
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void resize(unsigned int size);
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void reset();
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SampleVector& getData() { return m_data; }
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void read(
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unsigned int amount,
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unsigned int& ipart1Begin, unsigned int& ipart1End, // first part offsets where to read
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unsigned int& ipart2Begin, unsigned int& ipart2End // second part offsets
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);
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void write( //!< in place write
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unsigned int amount,
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unsigned int& ipart1Begin, unsigned int& ipart1End, // first part offsets where to write
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unsigned int& ipart2Begin, unsigned int& ipart2End // second part offsets
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);
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unsigned int remainder()
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{
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QMutexLocker mutexLocker(&m_mutex);
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return m_readCount;
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}
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/** returns ratio of off center over buffer size with sign: negative read lags and positive read leads */
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float getRWBalance() const
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{
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int delta;
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if (m_writeHead > m_readHead) {
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delta = (m_size/m_rwDivisor) - (m_writeHead - m_readHead);
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} else {
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delta = (m_readHead - m_writeHead) - (m_size/m_rwDivisor);
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}
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return delta / (float) m_size;
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}
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unsigned int size() const { return m_size; }
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static unsigned int getSizePolicy(unsigned int sampleRate);
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static const unsigned int m_rwDivisor;
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static const unsigned int m_guardDivisor;
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signals:
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void dataRead();
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private:
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SampleVector m_data;
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unsigned int m_size;
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unsigned int m_lowGuard;
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unsigned int m_highGuard;
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unsigned int m_midPoint;
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unsigned int m_readHead;
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unsigned int m_writeHead;
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unsigned int m_readCount;
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QMutex m_mutex;
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};
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#endif // SDRBASE_DSP_SAMPLESOURCEFIFO_H_
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