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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
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