2017-01-11 22:33:37 +01:00
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/*
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* Copyright 2003-2017 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 "Dsd16.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 16 bit integer from two bytes.
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*/
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static constexpr inline uint16_t
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2017-10-26 12:26:50 +02:00
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Construct16(uint8_t a, uint8_t b) noexcept
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2017-01-11 22:33:37 +01:00
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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 uint16_t(b) | (uint16_t(a) << 8);
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}
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static constexpr inline uint16_t
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2017-10-26 12:26:50 +02:00
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Dsd8To16Sample(const uint8_t *src, unsigned channels) noexcept
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2017-01-11 22:33:37 +01:00
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{
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return Construct16(src[0], src[channels]);
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}
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ConstBuffer<uint16_t>
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2017-10-26 12:26:50 +02:00
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Dsd8To16(PcmBuffer &buffer, unsigned channels,
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ConstBuffer<uint8_t> _src) noexcept
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2017-01-11 22:33:37 +01:00
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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 / 2;
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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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uint16_t *const dest0 = buffer.GetT<uint16_t>(out_samples);
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uint16_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++ = Dsd8To16Sample(src++, channels);
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src += channels;
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}
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return {dest0, out_samples};
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}
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