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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.
*/
#ifndef MPD_PCM_SHIFT_CONVERT_HXX
#define MPD_PCM_SHIFT_CONVERT_HXX
#include "Traits.hxx"
/**
* Convert from one integer sample format to another by shifting bits
* to the left.
*/
template<SampleFormat SF, SampleFormat DF,
class ST=SampleTraits<SF>,
class DT=SampleTraits<DF>>
struct LeftShiftSampleConvert {
typedef ST SrcTraits;
typedef DT DstTraits;
typedef typename SrcTraits::value_type SV;
typedef typename DstTraits::value_type DV;
static_assert(SrcTraits::BITS < DstTraits::BITS,
"Source format must be smaller than destination format");
constexpr static DV Convert(SV src) noexcept {
return DV(src) << (DstTraits::BITS - SrcTraits::BITS);
}
};
/**
* Convert from one integer sample format to another by shifting bits
* to the right.
*/
template<SampleFormat SF, SampleFormat DF,
class ST=SampleTraits<SF>,
class DT=SampleTraits<DF>>
struct RightShiftSampleConvert {
typedef ST SrcTraits;
typedef DT DstTraits;
typedef typename SrcTraits::value_type SV;
typedef typename DstTraits::value_type DV;
static_assert(SrcTraits::BITS > DstTraits::BITS,
"Source format must be smaller than destination format");
constexpr static DV Convert(SV src) noexcept {
return src >> (SrcTraits::BITS - DstTraits::BITS);
}
};
#endif
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