Initial commit

1 files changed, 31 insertions, 0 deletions

diff --git a/src/value-map.cpp b/src/value-map.cpp
new file mode 100644
index 0000000..4e6a231
--- /dev/null
+++ b/src/value-map.cpp
@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2020-2021 Vasile Vilvoiu <vasi.vilvoiu@gmail.com>
+ *
+ * specgram is free software; you can redistribute it and/or modify
+ * it under the terms of the MIT license. See LICENSE for details.
+ */
+#include "value-map.hpp"
+
+ValueMap::ValueMap(double lower, double upper) : lower_(lower), upper_(upper)
+{
+}
+
+dBFSValueMap::dBFSValueMap(double mindb) : ValueMap(mindb, 0)
+{
+}
+
+RealWindow
+dBFSValueMap::Map(const RealWindow& input)
+{
+    auto n = input.size();
+    RealWindow output;
+    output.resize(n);
+
+    for (unsigned int i = 0; i < n; i ++) {
+        output[i] = 20.0 * std::log10(input[i] / n);
+        output[i] = std::clamp<double>(output[i], this->lower_, 0.0f);
+        output[i] = 1.0f - output[i] / this->lower_;
+    }
+
+    return output;
+}
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