From 47bbfdbf1e2a6193157397938e76b16a1f60e789 Mon Sep 17 00:00:00 2001
From: Vasile Vilvoiu <vasi@vilvoiu.ro>
Date: Fri, 16 Jul 2021 18:32:27 +0300
Subject: Add support for arbitrary scales, with custom units.

Add support for linear scales.

Logging of scale to stderr.

Closes #9.
---
 src/value-map.hpp | 28 +++++++++++++++++++---------
 1 file changed, 19 insertions(+), 9 deletions(-)

(limited to 'src/value-map.hpp')

diff --git a/src/value-map.hpp b/src/value-map.hpp
index d162f45..2f32d92 100644
--- a/src/value-map.hpp
+++ b/src/value-map.hpp
@@ -15,15 +15,18 @@
 #include <complex>
 
 enum class ValueMapType {
-    kdBFS
+    kLinear,
+    kDecibel
 };
 
 class ValueMap {
 protected:
     const double lower_;
     const double upper_;
+    const std::string unit_;
+
+    ValueMap(double lower_, double upper, const std::string& unit);
 
-    ValueMap(double lower_, double upper);
 public:
     ValueMap() = delete;
 
@@ -31,18 +34,25 @@ public:
     auto GetUpperBound() const { return upper_; }
 
     virtual RealWindow Map(const RealWindow& input) = 0;
-    virtual std::string GetUnit() const = 0;
-    virtual std::string GetName() const = 0;
+    virtual std::string GetUnit() const;
+
+    static std::unique_ptr<ValueMap> Build(ValueMapType type, double lower, double upper, std::string unit);
+};
+
+class LinearValueMap : public ValueMap {
+public:
+    LinearValueMap(double lower, double upper, const std::string& unit);
+
+    RealWindow Map(const RealWindow& input) override;
 };
 
-class dBFSValueMap : public ValueMap {
-private:
+class DecibelValueMap : public ValueMap {
 public:
-    explicit dBFSValueMap(double mindb);
+    /* unit parameter should NOT contain "dB" prefix */
+    DecibelValueMap(double lower, double upper, const std::string& unit);
 
     RealWindow Map(const RealWindow& input) override;
-    std::string GetUnit() const override { return "dBFS"; }
-    std::string GetName() const override { return "dBFS"; }
+    std::string GetUnit() const override;
 };
 
 #endif
\ No newline at end of file
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