From 1989e1b9acab221718e10e1d4aecc6e9cd2acae1 Mon Sep 17 00:00:00 2001
From: bunnei <bunneidev@gmail.com>
Date: Sat, 22 Feb 2020 22:26:16 -0500
Subject: audio_core: interpolate: Improvements to fix audio crackling.

- Fixes audio crackling in Crash Team Racing Nitro-Fueled, Super Mario Odyssey, and others.
- Addresses followup issues from #3310.
---
 src/audio_core/algorithm/interpolate.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'src/audio_core/algorithm/interpolate.h')

diff --git a/src/audio_core/algorithm/interpolate.h b/src/audio_core/algorithm/interpolate.h
index 1b9831a75..ab1a31754 100644
--- a/src/audio_core/algorithm/interpolate.h
+++ b/src/audio_core/algorithm/interpolate.h
@@ -6,12 +6,17 @@
 
 #include <array>
 #include <vector>
+
 #include "common/common_types.h"
 
 namespace AudioCore {
 
 struct InterpolationState {
-    int fraction = 0;
+    static constexpr std::size_t taps{4};
+    static constexpr std::size_t history_size{taps * 2 - 1};
+    std::array<std::array<s16, 2>, history_size> history{};
+    double position{};
+    s32 fraction{};
 };
 
 /// Interpolates input signal to produce output signal.
-- 
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