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sdrangel/sdrbase/util/doublebufferfifo.h

86 lines
2.6 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 //
// (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/>. //
///////////////////////////////////////////////////////////////////////////////////
#ifndef SDRBASE_UTIL_DOUBLEBUFFERFIFO_H_
#define SDRBASE_UTIL_DOUBLEBUFFERFIFO_H_
template<typename T>
class DoubleBufferFIFO
{
public:
DoubleBufferFIFO(int size) : m_size(size), m_writeIndex(0), m_currentIndex(0)
{
m_data = new T[2*m_size];
}
~DoubleBufferFIFO()
{
delete[] m_data;
}
void resize(int size)
{
delete[] m_data;
m_size = size;
m_data = new T[2*m_size];
m_writeIndex = 0;
m_currentIndex = 0;
}
void write(const T& element)
{
m_data[m_writeIndex] = element;
m_data[m_writeIndex+m_size] = element;
m_currentIndex = m_writeIndex;
if (m_writeIndex < m_size - 1) {
m_writeIndex++;
} else {
m_writeIndex = 0;
}
}
T& readBack(int delay)
{
if (delay > m_size) {
delay = m_size;
}
return m_data[m_currentIndex + m_size - delay];
}
void zeroBack(int delay)
{
if (delay > m_size) {
delay = m_size;
}
for (int i = 0; i < delay; i++) {
m_data[m_currentIndex + m_size - i] = 0;
}
}
private:
int m_size;
T *m_data;
int m_writeIndex;
int m_currentIndex;
};
#endif /* SDRBASE_UTIL_DOUBLEBUFFERFIFO_H_ */