66 lines
1.9 KiB
C++
66 lines
1.9 KiB
C++
/*
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* Copyright 2003-2018 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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#include "config.h"
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#include "Dsd32.hxx"
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#include "PcmBuffer.hxx"
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#include "util/ConstBuffer.hxx"
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/**
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* Construct a 32 bit integer from four bytes.
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*/
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static constexpr inline uint32_t
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Construct32(uint8_t a, uint8_t b, uint8_t c, uint8_t d) noexcept
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{
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/* "a" is the oldest byte, which must be in the most
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significant byte */
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return uint32_t(d) | (uint32_t(c) << 8) |
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(uint32_t(b) << 16) | (uint32_t(a) << 24);
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}
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static constexpr inline uint32_t
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Dsd8To32Sample(const uint8_t *src, unsigned channels) noexcept
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{
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return Construct32(src[0], src[channels],
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src[2 * channels], src[3 * channels]);
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}
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ConstBuffer<uint32_t>
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Dsd8To32(PcmBuffer &buffer, unsigned channels,
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ConstBuffer<uint8_t> _src) noexcept
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{
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const size_t in_frames = _src.size / channels;
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const size_t out_frames = in_frames / 4;
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const size_t out_samples = out_frames * channels;
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const uint8_t *src = _src.data;
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uint32_t *const dest0 = buffer.GetT<uint32_t>(out_samples);
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uint32_t *dest = dest0;
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for (size_t i = 0; i < out_frames; ++i) {
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for (size_t c = 0; c < channels; ++c)
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*dest++ = Dsd8To32Sample(src++, channels);
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src += 3 * channels;
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}
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return {dest0, out_samples};
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}
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