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3f5e373ee4
I was having an issue with size of off_t on a multi-gigabit file. This may have been related to long being a signed 32 bits on MSVC. But I think there is good reason to use size_t here in general: https://stackoverflow.com/questions/10634629/what-are-the-usage-differences-between-size-t-and-off-t
62 lines
2.0 KiB
C++
62 lines
2.0 KiB
C++
/*
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* Copyright (C) 2015, Mike Walters <mike@flomp.net>
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*
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* This file is part of inspectrum.
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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, either 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 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 <QMutexLocker>
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#include <string.h>
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#include "samplebuffer.h"
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template <typename Tin, typename Tout>
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SampleBuffer<Tin, Tout>::SampleBuffer(std::shared_ptr<SampleSource<Tin>> src) : src(src)
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{
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src->subscribe(this);
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}
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template <typename Tin, typename Tout>
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SampleBuffer<Tin, Tout>::~SampleBuffer()
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{
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src->unsubscribe(this);
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}
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template <typename Tin, typename Tout>
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std::unique_ptr<Tout[]> SampleBuffer<Tin, Tout>::getSamples(size_t start, size_t length)
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{
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// TODO: base this on the actual history required
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auto history = std::min(start, (size_t)256);
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auto samples = src->getSamples(start - history, length + history);
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if (samples == nullptr)
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return nullptr;
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std::unique_ptr<Tout[]> temp(new Tout[history + length]);
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std::unique_ptr<Tout[]> dest(new Tout[length]);
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QMutexLocker ml(&mutex);
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work(samples.get(), temp.get(), history + length, start);
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memcpy(dest.get(), temp.get() + history, length * sizeof(Tout));
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return dest;
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}
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template <typename Tin, typename Tout>
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void SampleBuffer<Tin, Tout>::invalidateEvent()
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{
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SampleSource<Tout>::invalidate();
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}
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template class SampleBuffer<std::complex<float>, std::complex<float>>;
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template class SampleBuffer<std::complex<float>, float>;
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template class SampleBuffer<float, float>;
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