From 440ce71dcedb39e827660d0925b6cc2046c6d0f0 Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Sat, 24 Apr 2021 13:46:52 -0700
Subject: Move GetHFOrderScales to a more appropriate place
---
core/ambidefs.cpp | 44 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
create mode 100644 core/ambidefs.cpp
(limited to 'core/ambidefs.cpp')
diff --git a/core/ambidefs.cpp b/core/ambidefs.cpp
new file mode 100644
index 00000000..2725748e
--- /dev/null
+++ b/core/ambidefs.cpp
@@ -0,0 +1,44 @@
+
+#include "config.h"
+
+#include "ambidefs.h"
+
+#include <cassert>
+
+
+namespace {
+
+constexpr std::array<float,MaxAmbiOrder+1> Ambi3DDecoderHFScale{{
+ 1.00000000e+00f, 1.00000000e+00f
+}};
+constexpr std::array<float,MaxAmbiOrder+1> Ambi3DDecoderHFScale2O{{
+ 7.45355990e-01f, 1.00000000e+00f, 1.00000000e+00f
+}};
+constexpr std::array<float,MaxAmbiOrder+1> Ambi3DDecoderHFScale3O{{
+ 5.89792205e-01f, 8.79693856e-01f, 1.00000000e+00f, 1.00000000e+00f
+}};
+
+inline auto& GetDecoderHFScales(uint order) noexcept
+{
+ if(order >= 3) return Ambi3DDecoderHFScale3O;
+ if(order == 2) return Ambi3DDecoderHFScale2O;
+ return Ambi3DDecoderHFScale;
+}
+
+} // namespace
+
+auto AmbiScale::GetHFOrderScales(const uint in_order, const uint out_order) noexcept
+ -> std::array<float,MaxAmbiOrder+1>
+{
+ std::array<float,MaxAmbiOrder+1> ret{};
+
+ assert(out_order >= in_order);
+
+ const auto &target = GetDecoderHFScales(out_order);
+ const auto &input = GetDecoderHFScales(in_order);
+
+ for(size_t i{0};i < in_order+1;++i)
+ ret[i] = input[i] / target[i];
+
+ return ret;
+}
--
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