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102 lines
3 KiB
C++
102 lines
3 KiB
C++
#ifndef SPROUT_COMPOST_FORMATS_AS_PCM_WAVE_HPP
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#define SPROUT_COMPOST_FORMATS_AS_PCM_WAVE_HPP
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#include <cstdint>
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#include <limits>
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/algorithm/clamp.hpp>
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#include <sprout/utility/forward.hpp>
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#include <sprout/type_traits/is_int.hpp>
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#include <sprout/type_traits/is_uint.hpp>
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#include <sprout/range/adaptor/transformed.hpp>
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namespace sprout {
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namespace compost {
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namespace detail {
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template<typename IntType, typename = void>
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struct normalized_to_pcm_wave;
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template<typename IntType>
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struct normalized_to_pcm_wave<
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IntType,
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typename std::enable_if<sprout::is_int<IntType>::value>::type
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> {
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public:
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typedef IntType result_type;
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public:
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template<typename T>
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SPROUT_CONSTEXPR result_type operator()(T const& x) const {
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return static_cast<result_type>(sprout::clamp(x, -1, 1) * std::numeric_limits<result_type>::max());
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}
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};
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template<typename IntType>
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struct normalized_to_pcm_wave<
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IntType,
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typename std::enable_if<sprout::is_uint<IntType>::value>::type
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> {
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public:
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typedef IntType result_type;
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public:
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template<typename T>
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SPROUT_CONSTEXPR result_type operator()(T const& x) const {
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return static_cast<result_type>(sprout::clamp((x + 1) / 2, 0, 1) * std::numeric_limits<result_type>::max());
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}
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};
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} // namespace detail
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//
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// normalized_to_pcm_wave
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//
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template<typename IntType>
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struct normalized_to_pcm_wave
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: public sprout::compost::detail::normalized_to_pcm_wave<IntType>
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{};
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namespace formats {
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//
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// as_pcm_wave_forwarder
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//
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template<typename IntType>
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class as_pcm_wave_forwarder {};
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//
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// as_pcm_wave
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//
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template<typename IntType>
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inline SPROUT_CONSTEXPR sprout::compost::formats::as_pcm_wave_forwarder<IntType>
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as_pcm_wave() {
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return sprout::compost::formats::as_pcm_wave_forwarder<IntType>();
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}
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//
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// operator|
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//
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template<typename Range, typename IntType>
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inline SPROUT_CONSTEXPR auto
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operator|(Range&& lhs, sprout::compost::formats::as_pcm_wave_forwarder<IntType> const&)
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-> decltype(
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sprout::forward<Range>(lhs)
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| sprout::adaptors::transformed(sprout::compost::normalized_to_pcm_wave<IntType>())
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)
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{
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return sprout::forward<Range>(lhs)
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| sprout::adaptors::transformed(sprout::compost::normalized_to_pcm_wave<IntType>())
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;
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}
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//
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// as_pcm_wave8
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// as_pcm_wave16
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//
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namespace {
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SPROUT_STATIC_CONSTEXPR sprout::compost::formats::as_pcm_wave_forwarder<std::uint8_t> as_pcm_wave8 = {};
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SPROUT_STATIC_CONSTEXPR sprout::compost::formats::as_pcm_wave_forwarder<std::int16_t> as_pcm_wave16 = {};
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} // anonymous-namespace
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} // namespace formats
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using sprout::compost::formats::as_pcm_wave;
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using sprout::compost::formats::as_pcm_wave8;
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using sprout::compost::formats::as_pcm_wave16;
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} // namespace compost
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} // namespace sprout
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#endif // #ifndef SPROUT_COMPOST_FORMATS_AS_PCM_WAVE_HPP
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