1 files changed, 20 insertions, 0 deletions
diff --git a/intern/audaspace/FX/AUD_ButterworthCalculator.h b/intern/audaspace/FX/AUD_ButterworthCalculator.h
new file mode 100644
index 00000000000..a7ae196afda
--- /dev/null
+++ b/intern/audaspace/FX/AUD_ButterworthCalculator.h
@@ -0,0 +1,20 @@
+#ifndef AUD_BUTTERWORTHCALCULATOR_H
+#define AUD_BUTTERWORTHCALCULATOR_H
+
+#include "AUD_IDynamicIIRFilterCalculator.h"
+
+class AUD_ButterworthCalculator : public AUD_IDynamicIIRFilterCalculator
+{
+private:
+	/**
+	 * The attack value in seconds.
+	 */
+	const float m_frequency;
+
+public:
+	AUD_ButterworthCalculator(float frequency);
+
+	virtual void recalculateCoefficients(AUD_SampleRate rate, std::vector<float> &b, std::vector<float> &a);
+};
+
+#endif // AUD_BUTTERWORTHCALCULATOR_H