mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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65 lines
2.9 KiB
C++
65 lines
2.9 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2017 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_NUMERIC_FFT_FIXED_IFFT_HPP
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#define SPROUT_NUMERIC_FFT_FIXED_IFFT_HPP
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#include <sprout/config.hpp>
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#include <sprout/array.hpp>
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#include <sprout/algorithm/fixed/results.hpp>
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#include <sprout/complex.hpp>
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#include <sprout/pit/pit.hpp>
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#include <sprout/numeric/fft/coefficients.hpp>
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namespace sprout {
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namespace fixed {
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namespace detail {
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template<typename value_type, std::size_t Size, typename Result, sprout::index_t... Indexes>
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inline SPROUT_CONSTEXPR typename sprout::fixed::results::algorithm<Result>::type
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make_ifft_result_impl(sprout::array<sprout::complex<value_type>, Size> const& container, Result const& result, sprout::index_tuple<Indexes...>) {
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return remake<Result>(result, sprout::size(result), (container[Indexes] / static_cast<value_type>(Size))...);
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}
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template<typename value_type, std::size_t Size, typename Result>
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inline SPROUT_CONSTEXPR typename sprout::fixed::results::algorithm<Result>::type
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make_ifft_result(sprout::array<sprout::complex<value_type>, Size> const& container, Result const& result) {
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return make_ifft_result_impl(container, result, sprout::make_index_tuple<sprout::container_traits<Result>::static_size>());
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}
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template<typename value_type, std::size_t Size>
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inline SPROUT_CONSTEXPR sprout::array<sprout::complex<value_type>, Size>
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ifft(sprout::array<sprout::complex<value_type>, Size> const& arr) {
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return sprout::fixed::detail::fft_loop(arr, 1, sprout::make_ifft_coefficients<value_type, Size>());
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}
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} // namespace detail
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//
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// ifft
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// Algorithm: Stockham decimation-in-time
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//
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template<
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typename ForwardIterator, typename Result,
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typename sprout::container_traits<Result>::size_type Size
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= sprout::container_traits<Result>::static_size
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>
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inline SPROUT_CONSTEXPR typename sprout::fixed::results::algorithm<Result>::type
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ifft(ForwardIterator first, ForwardIterator last, Result const& result) {
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return sprout::fixed::detail::make_ifft_result(
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sprout::fixed::detail::ifft(sprout::fixed::detail::make_input<Size>(first, last)), result
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);
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}
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template<typename Result, typename ForwardIterator>
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inline SPROUT_CONSTEXPR typename sprout::fixed::results::algorithm<Result>::type
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ifft(ForwardIterator first, ForwardIterator last) {
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return sprout::fixed::ifft(first, last, sprout::pit<Result>());
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}
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} // namespace fixed
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using sprout::fixed::ifft;
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} // namespace sprout
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#endif // #ifndef SPROUT_NUMERIC_FFT_FIXED_IFFT_HPP
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