add effects control (WIP)

src/audio/effects.hpp

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <map>
+#include <string>
+#include <variant>
+#include <optional>
+
+namespace audio {
+    struct Effect {
+        struct Property {
+            using Value = std::variant<float, int>;
+            int id;
+            Value def;
+            Value min;
+            Value max;
+        };
+        std::map<std::string, Property> properties;
+    };
+
+    class EffectControl {
+    public:
+        EffectControl(const Effect* effect) : effect(effect) {};
+        virtual ~EffectControl() = default;
+
+        virtual void set(const std::string& name, Effect::Property::Value value) = 0;
+    protected:
+        const Effect* effect = nullptr;
+    };
+}