Initial community commit

Src/external_dependencies/openmpt-trunk/soundlib/plugins/dmo/ParamEq.h

@@ -0,0 +1,98 @@
+/*
+ * ParamEq.h
+ * ---------
+ * Purpose: Implementation of the DMO Parametric Equalizer DSP (for non-Windows platforms)
+ * Notes  : (currently none)
+ * Authors: OpenMPT Devs
+ * The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
+ */
+
+
+#ifndef NO_PLUGINS
+
+#include "../PlugInterface.h"
+
+OPENMPT_NAMESPACE_BEGIN
+
+namespace DMO
+{
+
+class ParamEq final : public IMixPlugin
+{
+protected:
+	enum Parameters
+	{
+		kEqCenter = 0,
+		kEqBandwidth,
+		kEqGain,
+		kEqNumParameters
+	};
+
+	std::array<float, kEqNumParameters> m_param;
+
+	// Equalizer coefficients
+	float b0DIVa0, b1DIVa0, b2DIVa0, a1DIVa0, a2DIVa0;
+	// Equalizer memory
+	float x1[2], x2[2];
+	float y1[2], y2[2];
+	float m_maxFreqParam;
+
+public:
+	static IMixPlugin* Create(VSTPluginLib &factory, CSoundFile &sndFile, SNDMIXPLUGIN *mixStruct);
+	ParamEq(VSTPluginLib &factory, CSoundFile &sndFile, SNDMIXPLUGIN *mixStruct);
+
+	void Release() override { delete this; }
+	int32 GetUID() const override { return 0x120CED89; }
+	int32 GetVersion() const override { return 0; }
+	void Idle() override { }
+	uint32 GetLatency() const override { return 0; }
+
+	void Process(float *pOutL, float *pOutR, uint32 numFrames) override;
+
+	float RenderSilence(uint32) override { return 0.0f; }
+
+	int32 GetNumPrograms() const override { return 0; }
+	int32 GetCurrentProgram() override { return 0; }
+	void SetCurrentProgram(int32) override { }
+
+	PlugParamIndex GetNumParameters() const override { return kEqNumParameters; }
+	PlugParamValue GetParameter(PlugParamIndex index) override;
+	void SetParameter(PlugParamIndex index, PlugParamValue value) override;
+
+	void Resume() override;
+	void Suspend() override { m_isResumed = false; }
+	void PositionChanged() override;
+
+	bool IsInstrument() const override { return false; }
+	bool CanRecieveMidiEvents() override { return false; }
+	bool ShouldProcessSilence() override { return true; }
+
+#ifdef MODPLUG_TRACKER
+	CString GetDefaultEffectName() override { return _T("ParamEq"); }
+
+	CString GetParamName(PlugParamIndex param) override;
+	CString GetParamLabel(PlugParamIndex) override;
+	CString GetParamDisplay(PlugParamIndex param) override;
+
+	CString GetCurrentProgramName() override { return CString(); }
+	void SetCurrentProgramName(const CString &) override { }
+	CString GetProgramName(int32) override { return CString(); }
+
+	bool HasEditor() const override { return false; }
+#endif
+
+	int GetNumInputChannels() const override { return 2; }
+	int GetNumOutputChannels() const override { return 2; }
+
+protected:
+	float BandwidthInSemitones() const { return 1.0f + m_param[kEqBandwidth] * 35.0f; }
+	float FreqInHertz() const { return 80.0f + m_param[kEqCenter] * 15920.0f; }
+	float GainInDecibel() const { return (m_param[kEqGain] - 0.5f) * 30.0f; }
+	void RecalculateEqParams();
+};
+
+} // namespace DMO
+
+OPENMPT_NAMESPACE_END
+
+#endif // !NO_PLUGINS