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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_PCM_DOP_HXX
#define MPD_PCM_DOP_HXX
#include "Buffer.hxx"
#include "RestBuffer.hxx"
#include <cstdint>
template<typename T> struct ConstBuffer;
/**
* Pack DSD 1 bit samples into (padded) 24 bit PCM samples for
* playback over USB, according to the DoP standard:
* http://dsd-guide.com/dop-open-standard
*/
class DsdToDopConverter {
unsigned channels;
PcmBuffer buffer;
PcmRestBuffer<uint8_t, 4> rest_buffer;
public:
void Open(unsigned _channels) noexcept;
void Reset() noexcept {
rest_buffer.Reset();
}
/**
* @return the size of one input block in bytes
*/
size_t GetInputBlockSize() const noexcept {
return rest_buffer.GetInputBlockSize();
}
/**
* @return the size of one output block in bytes
*/
size_t GetOutputBlockSize() const noexcept {
return 2 * GetInputBlockSize();
}
ConstBuffer<uint32_t> Convert(ConstBuffer<uint8_t> src) noexcept;
};
#endif
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