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add some compost effects.

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bolero-MURAKAMI 2012-11-09 22:33:11 +09:00
parent d01ee064e2
commit c7e6be98bb
20 changed files with 1815 additions and 6 deletions
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149
sprout/compost/effects/reverb.hpp Normal file
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#ifndef SPROUT_COMPOST_EFFECTS_REVERB_HPP
#define SPROUT_COMPOST_EFFECTS_REVERB_HPP
#include <cstddef>
#include <iterator>
#include <sprout/config.hpp>
#include <sprout/utility/forward.hpp>
#include <sprout/math/constants.hpp>
#include <sprout/math/pow.hpp>
#include <sprout/range/adaptor/transformed.hpp>
#include <sprout/range/adaptor/outdirected.hpp>
#include <sprout/range/adaptor/indexed.hpp>
namespace sprout {
namespace compost {
//
// reverb_outdirected_value
//
template<typename Value, typename IntType>
struct reverb_outdirected_value {
public:
typedef Value value_type;
typedef IntType int_type;
private:
value_type attenuation_;
value_type delay_;
std::size_t repeat_;
int_type samples_per_sec_;
private:
template<typename Outdirected>
SPROUT_CONSTEXPR typename std::iterator_traits<Outdirected>::value_type
calc_1(Outdirected const& x, std::size_t i, typename Outdirected::index_type m) const {
return m >= 0 ? sprout::math::pow(attenuation_, i) * x[m - x.index()]
: 0
;
}
template<typename Outdirected>
SPROUT_CONSTEXPR typename std::iterator_traits<Outdirected>::value_type
calc(Outdirected const& x, std::size_t i = 1) const {
return i <= repeat_
? calc_1(x, i, static_cast<typename Outdirected::index_type>(x.index() - i * delay_ * samples_per_sec_)) + calc(x, i + 1)
: 0
;
}
public:
SPROUT_CONSTEXPR reverb_outdirected_value(
value_type const& attenuation, value_type const& delay,
std::size_t repeat = 2, int_type samples_per_sec = 44100
)
: attenuation_(attenuation), delay_(delay), repeat_(repeat), samples_per_sec_(samples_per_sec)
{}
template<typename Outdirected>
SPROUT_CONSTEXPR typename std::iterator_traits<Outdirected>::value_type
operator()(Outdirected const& x) const {
return *x + calc(x);
}
};
namespace effects {
//
// reverb_holder
//
template<typename T, typename IntType = int>
class reverb_holder {
public:
typedef T value_type;
typedef IntType int_type;
private:
value_type attenuation_;
value_type delay_;
std::size_t repeat_;
int_type samples_per_sec_;
public:
reverb_holder() = default;
reverb_holder(reverb_holder const&) = default;
SPROUT_CONSTEXPR reverb_holder(
value_type const& attenuation, value_type const& delay,
std::size_t repeat = 2, int_type samples_per_sec = 44100
)
: attenuation_(attenuation), delay_(delay), repeat_(repeat), samples_per_sec_(samples_per_sec)
{}
SPROUT_CONSTEXPR value_type const& attenuation() const {
return attenuation_;
}
SPROUT_CONSTEXPR value_type const& delay() const {
return delay_;
}
SPROUT_CONSTEXPR std::size_t const& repeat() const {
return repeat_;
}
SPROUT_CONSTEXPR int_type const& samples_per_sec() const {
return samples_per_sec_;
}
};
//
// reverbed_forwarder
//
class reverbed_forwarder {
public:
template<typename T, typename IntType>
SPROUT_CONSTEXPR sprout::compost::effects::reverb_holder<T, IntType>
operator()(T const& attenuation, T const& delay, std::size_t repeat, IntType samples_per_sec) {
return sprout::compost::effects::reverb_holder<T, IntType>(attenuation, delay, repeat, samples_per_sec);
}
template<typename T>
SPROUT_CONSTEXPR sprout::compost::effects::reverb_holder<T>
operator()(T const& attenuation, T const& delay, std::size_t repeat = 2) {
return sprout::compost::effects::reverb_holder<T>(attenuation, delay, repeat);
}
};
//
// reverbed
//
namespace {
SPROUT_STATIC_CONSTEXPR sprout::compost::effects::reverbed_forwarder reverbed{};
} // anonymous-namespace
//
// operator|
//
template<typename Range, typename T, typename IntType>
inline SPROUT_CONSTEXPR auto
operator|(Range&& lhs, sprout::compost::effects::reverb_holder<T, IntType> const& rhs)
-> decltype(
sprout::forward<Range>(lhs)
| sprout::adaptors::indexed | sprout::adaptors::outdirected
| sprout::adaptors::transformed(
sprout::compost::reverb_outdirected_value<T, IntType>(
rhs.attenuation(), rhs.delay(), rhs.repeat(), rhs.samples_per_sec()
)
)
)
{
return sprout::forward<Range>(lhs)
| sprout::adaptors::indexed | sprout::adaptors::outdirected
| sprout::adaptors::transformed(
sprout::compost::reverb_outdirected_value<T, IntType>(
rhs.attenuation(), rhs.delay(), rhs.repeat(), rhs.samples_per_sec()
)
)
;
}
} // namespace effects
} // namespace compost
} // namespace sprout
#endif // #ifndef SPROUT_COMPOST_EFFECTS_REVERB_HPP