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/*
* Copyright 2003-2018 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.
*/
#include "config.h"
#include "Dsd16.hxx"
#include "PcmBuffer.hxx"
#include "util/ConstBuffer.hxx"
/**
* Construct a 16 bit integer from two bytes.
*/
static constexpr inline uint16_t
Construct16(uint8_t a, uint8_t b) noexcept
{
/* "a" is the oldest byte, which must be in the most
significant byte */
return uint16_t(b) | (uint16_t(a) << 8);
}
static constexpr inline uint16_t
Dsd8To16Sample(const uint8_t *src, unsigned channels) noexcept
{
return Construct16(src[0], src[channels]);
}
ConstBuffer<uint16_t>
Dsd8To16(PcmBuffer &buffer, unsigned channels,
ConstBuffer<uint8_t> _src) noexcept
{
const size_t in_frames = _src.size / channels;
const size_t out_frames = in_frames / 2;
const size_t out_samples = out_frames * channels;
const uint8_t *src = _src.data;
uint16_t *const dest0 = buffer.GetT<uint16_t>(out_samples);
uint16_t *dest = dest0;
for (size_t i = 0; i < out_frames; ++i) {
for (size_t c = 0; c < channels; ++c)
*dest++ = Dsd8To16Sample(src++, channels);
src += channels;
}
return {dest0, out_samples};
}
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