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/*
* Copyright 2003-2021 The Music Player Daemon Project
* http://www.musicpd.org
*
* 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; either version 2 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 for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_PEAK_BUFFER_HXX
#define MPD_PEAK_BUFFER_HXX
#include "Compiler.h"
#include <cstddef>
#include <cstdint>
template<typename T> struct WritableBuffer;
template<typename T> class DynamicFifoBuffer;
/**
* A FIFO-like buffer that will allocate more memory on demand to
* allow large peaks. This second buffer will be given back to the
* kernel when it has been consumed.
*/
class PeakBuffer {
std::size_t normal_size, peak_size;
DynamicFifoBuffer<uint8_t> *normal_buffer, *peak_buffer;
public:
PeakBuffer(std::size_t _normal_size, std::size_t _peak_size)
:normal_size(_normal_size), peak_size(_peak_size),
normal_buffer(nullptr), peak_buffer(nullptr) {}
PeakBuffer(PeakBuffer &&other)
:normal_size(other.normal_size), peak_size(other.peak_size),
normal_buffer(other.normal_buffer),
peak_buffer(other.peak_buffer) {
other.normal_buffer = nullptr;
other.peak_buffer = nullptr;
}
~PeakBuffer();
PeakBuffer(const PeakBuffer &) = delete;
PeakBuffer &operator=(const PeakBuffer &) = delete;
gcc_pure
bool empty() const noexcept;
gcc_pure
WritableBuffer<void> Read() const noexcept;
void Consume(std::size_t length) noexcept;
bool Append(const void *data, std::size_t length);
};
#endif
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