kopia lustrzana https://github.com/f4exb/sdrangel
158 wiersze
3.8 KiB
C++
158 wiersze
3.8 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2020 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
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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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// (at your option) any later version. //
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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 "samplesimplefifo.h"
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void SampleSimpleFifo::create(unsigned int s)
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{
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m_size = 0;
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m_fill = 0;
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m_head = 0;
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m_tail = 0;
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m_data.resize(s);
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m_size = m_data.size();
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}
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void SampleSimpleFifo::reset()
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{
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m_fill = 0;
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m_head = 0;
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m_tail = 0;
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}
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SampleSimpleFifo::SampleSimpleFifo() :
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m_data()
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{
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m_size = 0;
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m_fill = 0;
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m_head = 0;
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m_tail = 0;
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}
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SampleSimpleFifo::SampleSimpleFifo(int size) :
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m_data()
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{
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create(size);
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}
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SampleSimpleFifo::SampleSimpleFifo(const SampleSimpleFifo& other) :
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m_data(other.m_data)
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{
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m_size = m_data.size();
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m_fill = 0;
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m_head = 0;
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m_tail = 0;
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}
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SampleSimpleFifo::~SampleSimpleFifo()
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{
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m_size = 0;
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}
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bool SampleSimpleFifo::setSize(int size)
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{
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create(size);
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return m_data.size() == (unsigned int) size;
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}
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unsigned int SampleSimpleFifo::write(SampleVector::const_iterator begin, SampleVector::const_iterator end)
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{
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unsigned int count = end - begin;
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unsigned int total;
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unsigned int remaining;
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unsigned int len;
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total = count;
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remaining = total;
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while (remaining > 0)
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{
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len = std::min(remaining, m_size - m_tail);
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std::copy(begin, begin + len, m_data.begin() + m_tail);
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m_tail += len;
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m_tail %= m_size;
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m_fill += len;
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begin += len;
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remaining -= len;
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}
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if (m_fill >= m_size) // has wrapped around at least once
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{
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m_head = m_tail;
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m_fill = m_size;
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}
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return m_fill;
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}
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unsigned int SampleSimpleFifo::readBegin(unsigned int count,
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SampleVector::iterator* part1Begin, SampleVector::iterator* part1End,
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SampleVector::iterator* part2Begin, SampleVector::iterator* part2End)
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{
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unsigned int total;
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unsigned int remaining;
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unsigned int len;
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unsigned int head = m_head;
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total = count;
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remaining = total;
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if (remaining > 0)
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{
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len = std::min(remaining, m_size - head);
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*part1Begin = m_data.begin() + head;
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*part1End = m_data.begin() + head + len;
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head += len;
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head %= m_size;
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remaining -= len;
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}
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else
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{
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*part1Begin = m_data.end();
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*part1End = m_data.end();
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}
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if (remaining > 0)
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{
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len = std::min(remaining, m_size - head);
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*part2Begin = m_data.begin() + head;
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*part2End = m_data.begin() + head + len;
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}
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else
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{
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*part2Begin = m_data.end();
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*part2End = m_data.end();
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}
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return total;
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}
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unsigned int SampleSimpleFifo::readCommit(unsigned int count)
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{
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if (count > m_fill)
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{
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qCritical("SampleSinkFifo::readCommit: cannot commit more than available samples");
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count = m_fill;
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}
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m_head = (m_head + count) % m_size;
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m_fill -= count;
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return count;
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}
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