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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 PCM_BUFFER_HXX
#define PCM_BUFFER_HXX
#include "util/ReusableArray.hxx"
#include "util/Compiler.h"
#include <cstdint>
/**
* Manager for a temporary buffer which grows as needed. We could
* allocate a new buffer every time pcm_convert() is called, but that
* would put too much stress on the allocator.
*/
class PcmBuffer {
ReusableArray<uint8_t, 8192> buffer;
public:
void Clear() noexcept {
buffer.Clear();
}
/**
* Get the buffer, and guarantee a minimum size. This buffer becomes
* invalid with the next Get() call.
*
* This function will never return nullptr, even if size is
* zero, because the PCM library uses the nullptr return value
* to signal "error". An empty destination buffer is not
* always an error.
*/
gcc_malloc gcc_returns_nonnull
void *Get(size_t size) noexcept;
template<typename T>
gcc_malloc gcc_returns_nonnull
T *GetT(size_t n) noexcept {
return (T *)Get(n * sizeof(T));
}
};
#endif
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