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/*
* Copyright 2003-2017 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_FLOAT_CONVERT_HXX
#define MPD_PCM_FLOAT_CONVERT_HXX
#include "Traits.hxx"
/**
* Convert from float to an integer sample format.
*/
template<SampleFormat F, class Traits=SampleTraits<F>>
struct FloatToIntegerSampleConvert {
typedef SampleTraits<SampleFormat::FLOAT> SrcTraits;
typedef Traits DstTraits;
typedef typename SrcTraits::value_type SV;
typedef typename SrcTraits::long_type SL;
typedef typename DstTraits::value_type DV;
static constexpr SV factor = 1 << (DstTraits::BITS - 1);
static_assert(factor > 0, "Wrong factor");
gcc_const
static DV Convert(SV src) noexcept {
return PcmClamp<F, Traits>(SL(src * factor));
}
};
/**
* Convert from an integer sample format to float.
*/
template<SampleFormat F, class Traits=SampleTraits<F>>
struct IntegerToFloatSampleConvert {
typedef SampleTraits<SampleFormat::FLOAT> DstTraits;
typedef Traits SrcTraits;
typedef typename SrcTraits::value_type SV;
typedef typename DstTraits::value_type DV;
static constexpr DV factor = 1.0 / FloatToIntegerSampleConvert<F, Traits>::factor;
static_assert(factor > 0, "Wrong factor");
gcc_const
static DV Convert(SV src) noexcept {
return DV(src) * factor;
}
};
#endif
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