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87 lines
2.6 KiB
C++
87 lines
2.6 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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#include <assert.h>
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#include "samplesourcefifo.h"
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SampleSourceFifo::SampleSourceFifo(uint32_t size, uint32_t samplesChunkSize) :
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m_size(size),
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m_samplesChunkSize(samplesChunkSize),
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m_ir(0),
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m_iw(size/2)
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{
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assert(samplesChunkSize <= m_size/4);
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m_data.resize(2*m_size);
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}
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SampleSourceFifo::~SampleSourceFifo()
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{}
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void SampleSourceFifo::read(SampleVector::iterator& beginRead, unsigned int nbSamples)
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{
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QMutexLocker mutexLocker(&m_mutex);
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assert(nbSamples < m_samplesChunkSize/2);
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beginRead = m_data.begin() + m_size + m_ir;
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m_ir = (m_ir + nbSamples) % m_size;
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int i_delta = m_iw - m_ir;
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if (i_delta > 0)
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{
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if (i_delta < m_samplesChunkSize)
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{
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emit dataWrite();
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}
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}
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else
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{
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if (i_delta + m_size < m_samplesChunkSize)
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{
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emit dataWrite();
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}
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}
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}
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void SampleSourceFifo::write(const Sample& sample)
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{
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m_data[m_iw] = sample;
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m_data[m_iw+m_size] = sample;
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{
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QMutexLocker mutexLocker(&m_mutex);
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m_iw = (m_iw+1) % m_size;
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}
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}
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void SampleSourceFifo::getWriteIterator(SampleVector::iterator& writeAt)
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{
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writeAt = m_data.begin() + m_iw;
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}
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void SampleSourceFifo::bumpIndex()
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{
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m_data[m_iw+m_size] = m_data[m_iw];
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m_iw = (m_iw+1) % m_size;
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{
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QMutexLocker mutexLocker(&m_mutex);
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m_iw = (m_iw+1) % m_size;
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}
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}
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