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+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <array>
+#include <vector>
+#include "audio_core/algorithm/filter.h"
+#include "common/common_types.h"
+
+namespace AudioCore {
+
+struct InterpolationState {
+ static constexpr size_t lanczos_taps = 4;
+ static constexpr size_t history_size = lanczos_taps * 2 - 1;
+
+ double current_ratio = 0.0;
+ CascadingFilter nyquist;
+ std::array<std::array<s16, 2>, history_size> history = {};
+ double position = 0;
+};
+
+/// Interpolates input signal to produce output signal.
+/// @param input The signal to interpolate.
+/// @param ratio Interpolation ratio.
+/// ratio > 1.0 results in fewer output samples.
+/// ratio < 1.0 results in more output samples.
+/// @returns Output signal.
+std::vector<s16> Interpolate(InterpolationState& state, std::vector<s16> input, double ratio);
+
+/// Interpolates input signal to produce output signal.
+/// @param input The signal to interpolate.
+/// @param input_rate The sample rate of input.
+/// @param output_rate The desired sample rate of the output.
+/// @returns Output signal.
+inline std::vector<s16> Interpolate(InterpolationState& state, std::vector<s16> input,
+ u32 input_rate, u32 output_rate) {
+ const double ratio = static_cast<double>(input_rate) / static_cast<double>(output_rate);
+ return Interpolate(state, std::move(input), ratio);
+}
+
+} // namespace AudioCore