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/*
* EQ.h
* ----
* Purpose: Mixing code for equalizer.
* Notes : Ugh... This should really be removed at some point.
* Authors: Olivier Lapicque
* OpenMPT Devs
* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
*/
#pragma once
#include "openmpt/all/BuildSettings.hpp"
#include "openmpt/base/Types.hpp"
#include "openmpt/soundbase/MixSample.hpp"
#include <array>
#include <cstddef>
OPENMPT_NAMESPACE_BEGIN
#ifndef NO_EQ
inline constexpr std::size_t MAX_EQ_CHANNELS = 4;
inline constexpr std::size_t MAX_EQ_BANDS = 6;
struct EQBANDSTATE
{
float x1 = 0.0f;
float x2 = 0.0f;
float y1 = 0.0f;
float y2 = 0.0f;
};
struct EQBANDSETTINGS
{
float a0;
float a1;
float a2;
float b1;
float b2;
float Gain;
float CenterFrequency;
};
class CEQ
{
private:
std::array<std::array<EQBANDSTATE, MAX_EQ_BANDS>, MAX_EQ_CHANNELS> m_ChannelState;
std::array<EQBANDSETTINGS, MAX_EQ_BANDS> m_Bands;
template <typename TMixSample>
void ProcessTemplate(TMixSample *frontBuffer, TMixSample *rearBuffer, std::size_t countFrames, std::size_t numChannels);
public:
CEQ();
void Initialize(bool bReset, uint32 MixingFreq);
void Process(MixSampleInt *frontBuffer, MixSampleInt *rearBuffer, std::size_t countFrames, std::size_t numChannels);
void Process(MixSampleFloat *frontBuffer, MixSampleFloat *rearBuffer, std::size_t countFrames, std::size_t numChannels);
void SetEQGains(const uint32 *pGains, const uint32 *pFreqs, bool bReset, uint32 MixingFreq);
};
#endif // !NO_EQ
OPENMPT_NAMESPACE_END
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