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72 lines
3.1 KiB
C++
72 lines
3.1 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2016 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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// //
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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 <stdint.h>
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#include <assert.h>
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#include "export.h"
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#include "dsp/dsptypes.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(uint32_t size);
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~SampleSourceFifo();
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void resize(uint32_t size);
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uint32_t size() const { return m_size; }
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void init();
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/** advance read pointer for the given length and activate R/W signals */
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void readAdvance(SampleVector::iterator& readUntil, unsigned int nbSamples);
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void getReadIterator(SampleVector::iterator& readUntil); //!< get iterator past the last sample of a read advance operation (i.e. current read iterator)
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void getWriteIterator(SampleVector::iterator& writeAt); //!< get iterator to current item for update - write phase 1
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void bumpIndex(SampleVector::iterator& writeAt); //!< copy current item to second buffer and bump write index - write phase 2
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void write(const Sample& sample); //!< write directly - phase 1 + phase 2
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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_iw > m_ir) {
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delta = (m_size/2) - (m_iw - m_ir);
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} else {
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delta = (m_ir - m_iw) - (m_size/2);
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}
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return delta / (float) m_size;
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}
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private:
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uint32_t m_size;
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SampleVector m_data;
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uint32_t m_iw;
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uint32_t m_ir;
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bool m_init;
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QMutex m_mutex;
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signals:
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void dataWrite(int nbSamples); // signal data is read past a threshold and writing new samples to fill in is needed
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void dataRead(int nbSamples); // signal a read has been done for a number of samples
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};
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#endif /* SDRBASE_DSP_SAMPLESOURCEFIFO_H_ */
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