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sdrangel/sdrbase/dsp/samplesourcefifo.h

83 lines
3.3 KiB
C++

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