50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
// Copyright The Music Player Daemon Project
|
|
|
|
#ifndef MPD_PCM_FLOAT_CONVERT_HXX
|
|
#define MPD_PCM_FLOAT_CONVERT_HXX
|
|
|
|
#include "Traits.hxx"
|
|
#include "Clamp.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 = uintmax_t(1) << (DstTraits::BITS - 1);
|
|
static_assert(factor > 0, "Wrong factor");
|
|
|
|
static constexpr 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 = 1.0f / FloatToIntegerSampleConvert<F, Traits>::factor;
|
|
static_assert(factor > 0, "Wrong factor");
|
|
|
|
static constexpr DV Convert(SV src) noexcept {
|
|
return DV(src) * factor;
|
|
}
|
|
};
|
|
|
|
#endif
|