67 lines
1.7 KiB
C++
67 lines
1.7 KiB
C++
/*
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* Copyright 2003-2020 The Music Player Daemon Project
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* http://www.musicpd.org
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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 2 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MPD_PCM_DOP_HXX
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#define MPD_PCM_DOP_HXX
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#include "Buffer.hxx"
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#include "RestBuffer.hxx"
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#include <stdint.h>
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template<typename T> struct ConstBuffer;
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/**
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* Pack DSD 1 bit samples into (padded) 24 bit PCM samples for
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* playback over USB, according to the DoP standard:
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* http://dsd-guide.com/dop-open-standard
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*/
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class DsdToDopConverter {
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unsigned channels;
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PcmBuffer buffer;
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PcmRestBuffer<uint8_t, 4> rest_buffer;
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public:
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void Open(unsigned _channels) noexcept;
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void Reset() noexcept {
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rest_buffer.Reset();
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}
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/**
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* @return the size of one input block in bytes
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*/
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size_t GetInputBlockSize() const noexcept {
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return rest_buffer.GetInputBlockSize();
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}
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/**
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* @return the size of one output block in bytes
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*/
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size_t GetOutputBlockSize() const noexcept {
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return 2 * GetInputBlockSize();
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}
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ConstBuffer<uint32_t> Convert(ConstBuffer<uint8_t> src) noexcept;
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};
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#endif
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