sdrangel/sdrbase/dsp/samplesimplefifo.cpp

158 wiersze
3.8 KiB
C++

///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2020 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 "samplesimplefifo.h"
void SampleSimpleFifo::create(unsigned int s)
{
m_size = 0;
m_fill = 0;
m_head = 0;
m_tail = 0;
m_data.resize(s);
m_size = m_data.size();
}
void SampleSimpleFifo::reset()
{
m_fill = 0;
m_head = 0;
m_tail = 0;
}
SampleSimpleFifo::SampleSimpleFifo() :
m_data()
{
m_size = 0;
m_fill = 0;
m_head = 0;
m_tail = 0;
}
SampleSimpleFifo::SampleSimpleFifo(int size) :
m_data()
{
create(size);
}
SampleSimpleFifo::SampleSimpleFifo(const SampleSimpleFifo& other) :
m_data(other.m_data)
{
m_size = m_data.size();
m_fill = 0;
m_head = 0;
m_tail = 0;
}
SampleSimpleFifo::~SampleSimpleFifo()
{
m_size = 0;
}
bool SampleSimpleFifo::setSize(int size)
{
create(size);
return m_data.size() == (unsigned int) size;
}
unsigned int SampleSimpleFifo::write(SampleVector::const_iterator begin, SampleVector::const_iterator end)
{
unsigned int count = end - begin;
unsigned int total;
unsigned int remaining;
unsigned int len;
total = count;
remaining = total;
while (remaining > 0)
{
len = std::min(remaining, m_size - m_tail);
std::copy(begin, begin + len, m_data.begin() + m_tail);
m_tail += len;
m_tail %= m_size;
m_fill += len;
begin += len;
remaining -= len;
}
if (m_fill >= m_size) // has wrapped around at least once
{
m_head = m_tail;
m_fill = m_size;
}
return m_fill;
}
unsigned int SampleSimpleFifo::readBegin(unsigned int count,
SampleVector::iterator* part1Begin, SampleVector::iterator* part1End,
SampleVector::iterator* part2Begin, SampleVector::iterator* part2End)
{
unsigned int total;
unsigned int remaining;
unsigned int len;
unsigned int head = m_head;
total = count;
remaining = total;
if (remaining > 0)
{
len = std::min(remaining, m_size - head);
*part1Begin = m_data.begin() + head;
*part1End = m_data.begin() + head + len;
head += len;
head %= m_size;
remaining -= len;
}
else
{
*part1Begin = m_data.end();
*part1End = m_data.end();
}
if (remaining > 0)
{
len = std::min(remaining, m_size - head);
*part2Begin = m_data.begin() + head;
*part2End = m_data.begin() + head + len;
}
else
{
*part2Begin = m_data.end();
*part2End = m_data.end();
}
return total;
}
unsigned int SampleSimpleFifo::readCommit(unsigned int count)
{
if (count > m_fill)
{
qCritical("SampleSinkFifo::readCommit: cannot commit more than available samples");
count = m_fill;
}
m_head = (m_head + count) % m_size;
m_fill -= count;
return count;
}