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sdrangel/plugins/channeltx/modm17/m17modfifo.cpp

133 lines
3.6 KiB
C++

///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2022 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
// //
// 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/>. //
///////////////////////////////////////////////////////////////////////////////////
#include "m17modfifo.h"
M17ModFIFO::M17ModFIFO() :
m_fifo(nullptr),
m_fifoEmpty(true)
{
m_size = 0;
m_writeIndex = 0;
m_readIndex = 0;
}
M17ModFIFO::M17ModFIFO(uint32_t numSamples) :
m_fifo(nullptr)
{
QMutexLocker mutexLocker(&m_mutex);
create(numSamples);
}
M17ModFIFO::~M17ModFIFO()
{
QMutexLocker mutexLocker(&m_mutex);
if (m_fifo)
{
delete[] m_fifo;
m_fifo = nullptr;
}
m_size = 0;
}
void M17ModFIFO::setSize(uint32_t numSamples)
{
QMutexLocker mutexLocker(&m_mutex);
create(numSamples);
}
void M17ModFIFO::create(uint32_t numSamples)
{
if (m_fifo)
{
delete[] m_fifo;
m_fifo = nullptr;
}
m_writeIndex = 0;
m_readIndex = 0;
m_fifo = new int16_t[numSamples];
m_size = numSamples;
}
uint32_t M17ModFIFO::write(const int16_t* data, uint32_t numSamples)
{
QMutexLocker mutexLocker(&m_mutex);
if (m_readIndex > m_writeIndex)
{
int rem = m_readIndex - m_writeIndex;
int written = std::min(rem, (int) numSamples);
std::copy(data, data + written, &m_fifo[m_writeIndex]);
m_writeIndex += written;
return written;
}
int remSize = m_size - m_writeIndex;
int written = std::min(remSize, (int) numSamples);
std::copy(data, data + written, &m_fifo[m_writeIndex]);
m_writeIndex += written;
m_writeIndex = m_writeIndex == (int) m_size ? 0 : m_writeIndex;
if (written == (int) numSamples) {
return written;
}
// wrap
int remWrite = (int) numSamples - written;
int remWritten = std::min(remWrite, m_readIndex);
std::copy(data + written, data + written + remWritten, m_fifo);
m_writeIndex = remWritten;
return written + remWritten;
}
uint32_t M17ModFIFO::readOne(int16_t* data)
{
QMutexLocker mutexLocker(&m_mutex);
if (m_readIndex == m_writeIndex)
{
if (!m_fifoEmpty) {
qDebug("M17ModFIFO::readOne: FIFO gets empty");
}
m_fifoEmpty = true;
*data = 0;
return 0;
}
else
{
m_fifoEmpty = false;
}
*data = m_fifo[m_readIndex++];
m_readIndex = m_readIndex == (int) m_size ? 0 : m_readIndex;
return 1;
}
int M17ModFIFO::getFill() const
{
if (m_readIndex > m_writeIndex) {
return m_size - (m_readIndex - m_writeIndex);
} else {
return m_writeIndex - m_readIndex;
}
}