Initial community commit

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

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+/*
+ * Echo.h
+ * ------
+ * Purpose: Implementation of the DMO Echo 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 Echo final : public IMixPlugin
+{
+protected:
+	enum Parameters
+	{
+		kEchoWetDry = 0,
+		kEchoFeedback,
+		kEchoLeftDelay,
+		kEchoRightDelay,
+		kEchoPanDelay,
+		kEchoNumParameters
+	};
+
+	std::vector<float> m_delayLine;	// Echo delay line
+	float m_param[kEchoNumParameters];
+	uint32 m_bufferSize;			// Delay line length in frames
+	uint32 m_writePos;				// Current write position in the delay line
+	uint32 m_delayTime[2];			// In frames
+	uint32 m_sampleRate;
+
+	// Echo calculation coefficients
+	float m_initialFeedback;
+	bool m_crossEcho;
+
+public:
+	static IMixPlugin* Create(VSTPluginLib &factory, CSoundFile &sndFile, SNDMIXPLUGIN *mixStruct);
+	Echo(VSTPluginLib &factory, CSoundFile &sndFile, SNDMIXPLUGIN *mixStruct);
+
+	void Release() override { delete this; }
+	int32 GetUID() const override { return 0xEF3E932C; }
+	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 kEchoNumParameters; }
+	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("Echo"); }
+
+	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:
+	void RecalculateEchoParams();
+};
+
+} // namespace DMO
+
+OPENMPT_NAMESPACE_END
+
+#endif // !NO_PLUGINS