sdrangel/sdrbase/dsp/samplesourcefifo.cpp

113 wiersze
3.1 KiB
C++

///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2016 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 //
// //
// 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/>. //
///////////////////////////////////////////////////////////////////////////////////
#include <assert.h>
#include "samplesourcefifo.h"
SampleSourceFifo::SampleSourceFifo(uint32_t size) :
m_size(size),
m_init(false)
{
m_data.resize(2*m_size);
init();
}
SampleSourceFifo::~SampleSourceFifo()
{}
void SampleSourceFifo::resize(uint32_t size)
{
qDebug("SampleSourceFifo::resize: %d", size);
m_size = size;
m_data.resize(2*m_size);
init();
}
void SampleSourceFifo::init()
{
memset(&m_data[0], 0, sizeof(2*m_size*sizeof(Sample)));
m_ir = 0;
m_iw = m_size/2;
m_init = true;
}
void SampleSourceFifo::readAdvance(SampleVector::iterator& readUntil, unsigned int nbSamples)
{
// QMutexLocker mutexLocker(&m_mutex);
assert(nbSamples <= m_size/2);
m_ir = (m_ir + nbSamples) % m_size;
readUntil = m_data.begin() + m_size + m_ir;
emit dataRead(nbSamples);
int i_delta = m_iw - m_ir;
if (m_init)
{
emit dataWrite(m_size/2);
m_init = false;
}
else if (i_delta > 0)
{
if (i_delta <= m_size/2) // m_samplesChunkSize)
{
emit dataWrite(m_size/2);
}
}
else
{
if (i_delta + m_size <= m_size/2) //m_samplesChunkSize)
{
emit dataWrite(m_size/2);
}
}
}
void SampleSourceFifo::write(const Sample& sample)
{
m_data[m_iw] = sample;
m_data[m_iw+m_size] = sample;
{
// QMutexLocker mutexLocker(&m_mutex);
m_iw = (m_iw+1) % m_size;
}
}
void SampleSourceFifo::getReadIterator(SampleVector::iterator& readUntil)
{
readUntil = m_data.begin() + m_size + m_ir;
}
void SampleSourceFifo::getWriteIterator(SampleVector::iterator& writeAt)
{
writeAt = m_data.begin() + m_iw;
}
void SampleSourceFifo::bumpIndex(SampleVector::iterator& writeAt)
{
m_data[m_iw+m_size] = m_data[m_iw];
{
// QMutexLocker mutexLocker(&m_mutex);
m_iw = (m_iw+1) % m_size;
}
writeAt = m_data.begin() + m_iw;
}