47 lines
958 B
C++
47 lines
958 B
C++
#pragma once
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#include "AudioBuffer.h"
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#include <array>
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namespace engine {
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class EqProcessor {
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public:
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static constexpr int BANDS = 10;
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static constexpr float FREQS[BANDS] = {
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32, 64, 125, 250, 500, 1000, 2000, 4000, 8000, 16000
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};
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EqProcessor();
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void setBand(int band, float dB);
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float band(int band) const;
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void process(AudioBuffer &buf);
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void reset();
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void setSampleRate(int sr);
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private:
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void recomputeBiquad(int band);
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int m_sampleRate { 44100 };
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float m_gainDb[BANDS] {};
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struct BiquadCoefficients {
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float b0 { 1.0f };
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float b1 { 0.0f };
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float b2 { 0.0f };
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float a1 { 0.0f };
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float a2 { 0.0f };
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};
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BiquadCoefficients m_coeff[BANDS];
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struct BiquadState {
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float z1 { 0.0f };
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float z2 { 0.0f };
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};
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static constexpr int MAX_CH = 8;
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BiquadState m_state[BANDS][MAX_CH] {};
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};
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} // namespace engine
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