mirror of
https://github.com/f4exb/sdrangel.git
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117 lines
3.3 KiB
C++
117 lines
3.3 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_init(false)
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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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init();
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}
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SampleSourceFifo::~SampleSourceFifo()
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{}
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void SampleSourceFifo::resize(uint32_t size, uint32_t samplesChunkSize)
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{
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qDebug("SampleSourceFifo::resize: %d, %d", size, samplesChunkSize);
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assert(samplesChunkSize <= size/4);
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m_size = size;
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m_samplesChunkSize = samplesChunkSize;
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m_data.resize(2*m_size);
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init();
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}
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void SampleSourceFifo::init()
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{
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memset(&m_data[0], 0, sizeof(2*m_size*sizeof(Sample)));
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m_ir = 0;
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m_iw = m_samplesChunkSize*2;
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m_init = true;
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}
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void SampleSourceFifo::readAdvance(SampleVector::iterator& readUntil, 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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m_ir = (m_ir + nbSamples) % m_size;
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readUntil = m_data.begin() + m_size + m_ir;
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emit dataRead(nbSamples);
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int i_delta = m_iw - m_ir;
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if (m_init)
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{
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emit dataWrite();
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m_init = false;
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}
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else 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::getReadIterator(SampleVector::iterator& readUntil)
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{
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readUntil = m_data.begin() + m_size + m_ir;
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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(SampleVector::iterator& writeAt)
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{
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m_data[m_iw+m_size] = m_data[m_iw];
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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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writeAt = m_data.begin() + m_iw;
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}
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