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add compost psuedo_stereo

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bolero-MURAKAMI 2012-11-25 10:09:41 +09:00
parent c33ae70d13
commit ca4fdcdbae
6 changed files with 190 additions and 35 deletions
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154
sprout/compost/effects/pseudo_stereo.hpp Normal file
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#ifndef SPROUT_COMPOST_EFFECTS_PSEUDO_STEREO_HPP
#define SPROUT_COMPOST_EFFECTS_PSEUDO_STEREO_HPP
#include <iterator>
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/utility/lvalue_forward.hpp>
#include <sprout/range/adaptor/transformed.hpp>
#include <sprout/range/adaptor/outdirected.hpp>
#include <sprout/range/adaptor/indexed.hpp>
#include <sprout/compost/formats/stereo.hpp>
namespace sprout {
namespace compost {
//
// pseudo_stereo_outdirected_value
//
template<typename Value, typename IntType, bool IsLeft>
struct pseudo_stereo_outdirected_value {
public:
typedef Value value_type;
typedef IntType int_type;
private:
value_type delay_;
int_type samples_per_sec_;
int_type d_;
private:
template<bool Left, typename Outdirected>
SPROUT_CONSTEXPR typename std::enable_if<
Left,
typename std::iterator_traits<Outdirected>::value_type
>::type
calc(Outdirected const& x) const {
return x.index() + d_ >= 0 ? *x + x[d_]
: 0
;
}
template<bool Left, typename Outdirected>
SPROUT_CONSTEXPR typename std::enable_if<
!Left,
typename std::iterator_traits<Outdirected>::value_type
>::type
calc(Outdirected const& x) const {
return x.index() + d_ >= 0 ? *x - x[d_]
: 0
;
}
public:
explicit SPROUT_CONSTEXPR pseudo_stereo_outdirected_value(
value_type const& delay, int_type samples_per_sec = 44100
)
: delay_(delay), samples_per_sec_(samples_per_sec), d_(static_cast<int_type>(-delay * samples_per_sec_))
{}
template<typename Outdirected>
SPROUT_CONSTEXPR typename std::iterator_traits<Outdirected>::value_type
operator()(Outdirected const& x) const {
return calc<IsLeft>(x);
}
};
namespace effects {
//
// pseudo_stereo_holder
//
template<typename T, typename IntType = int>
class pseudo_stereo_holder {
public:
typedef T value_type;
typedef IntType int_type;
private:
value_type delay_;
int_type samples_per_sec_;
public:
pseudo_stereo_holder() = default;
pseudo_stereo_holder(pseudo_stereo_holder const&) = default;
explicit SPROUT_CONSTEXPR pseudo_stereo_holder(
value_type const& delay, int_type samples_per_sec = 44100
)
: delay_(delay), samples_per_sec_(samples_per_sec)
{}
SPROUT_CONSTEXPR value_type const& delay() const {
return delay_;
}
SPROUT_CONSTEXPR int_type const& samples_per_sec() const {
return samples_per_sec_;
}
};
//
// pseudo_stereo_forwarder
//
class pseudo_stereo_forwarder {
public:
template<typename T, typename IntType>
SPROUT_CONSTEXPR sprout::compost::effects::pseudo_stereo_holder<T, IntType>
operator()(T const& delay, IntType samples_per_sec) {
return sprout::compost::effects::pseudo_stereo_holder<T, IntType>(delay, samples_per_sec);
}
template<typename T>
SPROUT_CONSTEXPR sprout::compost::effects::pseudo_stereo_holder<T>
operator()(T const& delay) {
return sprout::compost::effects::pseudo_stereo_holder<T>(delay);
}
};
//
// pseudo_stereo
//
namespace {
SPROUT_STATIC_CONSTEXPR sprout::compost::effects::pseudo_stereo_forwarder pseudo_stereo{};
} // anonymous-namespace
//
// operator|
//
template<typename Range, typename T, typename IntType>
inline SPROUT_CONSTEXPR auto
operator|(Range&& lhs, sprout::compost::effects::pseudo_stereo_holder<T, IntType> const& rhs)
-> decltype(
sprout::lvalue_forward<Range>(lhs)
| sprout::adaptors::indexed | sprout::adaptors::outdirected
| sprout::adaptors::transformed(
sprout::compost::pseudo_stereo_outdirected_value<T, IntType, true>(rhs.delay(), rhs.samples_per_sec())
)
| sprout::compost::formats::stereo(
sprout::lvalue_forward<Range>(lhs)
| sprout::adaptors::indexed | sprout::adaptors::outdirected
| sprout::adaptors::transformed(
sprout::compost::pseudo_stereo_outdirected_value<T, IntType, false>(rhs.delay(), rhs.samples_per_sec())
)
)
)
{
return sprout::lvalue_forward<Range>(lhs)
| sprout::adaptors::indexed | sprout::adaptors::outdirected
| sprout::adaptors::transformed(
sprout::compost::pseudo_stereo_outdirected_value<T, IntType, true>(rhs.delay(), rhs.samples_per_sec())
)
| sprout::compost::formats::stereo(
sprout::lvalue_forward<Range>(lhs)
| sprout::adaptors::indexed | sprout::adaptors::outdirected
| sprout::adaptors::transformed(
sprout::compost::pseudo_stereo_outdirected_value<T, IntType, false>(rhs.delay(), rhs.samples_per_sec())
)
)
;
}
} // namespace effects
using sprout::compost::effects::pseudo_stereo;
} // namespace compost
} // namespace sprout
#endif // #ifndef SPROUT_COMPOST_EFFECTS_PSEUDO_STEREO_HPP