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// license:BSD-3-Clause
// copyright-holders:Olivier Galibert
#pragma once
#ifndef MAME_EMU_AUDIO_EFFECTS_EQ_H
#define MAME_EMU_AUDIO_EFFECTS_EQ_H
#include "aeffect.h"
class audio_effect_eq : public audio_effect
{
public:
enum { BANDS = 5 };
audio_effect_eq(u32 sample_rate, audio_effect *def);
virtual ~audio_effect_eq() = default;
virtual int type() const override { return EQ; }
virtual void apply(const emu::detail::output_buffer_flat<sample_t> &src, emu::detail::output_buffer_flat<sample_t> &dest) override;
virtual void config_load(util::xml::data_node const *ef_node) override;
virtual void config_save(util::xml::data_node *ef_node) const override;
virtual void default_changed() override;
void set_mode(u32 mode);
void set_q(u32 band, float q);
void set_f(u32 band, float f);
void set_db(u32 band, float db);
void set_low_shelf(bool active);
void set_high_shelf(bool active);
u32 mode() const { return m_mode; }
float q(u32 band) const { return m_q[band]; }
float f(u32 band) const { return m_f[band]; }
float db(u32 band) const { return m_db[band]; }
bool low_shelf() const { return m_low_shelf; }
bool high_shelf() const { return m_high_shelf; }
bool isset_mode() const { return m_isset_mode; }
bool isset_q(u32 band) const { return m_isset_q[band]; }
bool isset_f(u32 band) const { return m_isset_f[band]; }
bool isset_db(u32 band) const { return m_isset_db[band]; }
bool isset_low_shelf() const { return m_isset_low_shelf; }
bool isset_high_shelf() const { return m_isset_high_shelf; }
void reset_mode();
void reset_q(u32 band);
void reset_f(u32 band);
void reset_db(u32 band);
void reset_low_shelf();
void reset_high_shelf();
private:
struct history {
float m_v0, m_v1, m_v2;
history() { m_v0 = m_v1 = m_v2 = 0; }
void push(float v) { m_v2 = m_v1; m_v1 = m_v0; m_v0 = v; }
};
struct filter {
float m_a1, m_a2, m_b0, m_b1, m_b2;
void clear() { m_a1 = 0; m_a2 = 0; m_b0 = 1; m_b1 = 0; m_b2 = 0; }
void apply(history &x, history &y) const {
y.push(m_b0 * x.m_v0 + m_b1 * x.m_v1 + m_b2 * x.m_v2 - m_a1 * y.m_v0 - m_a2 * y.m_v1);
}
};
u32 m_mode;
float m_q[BANDS], m_f[BANDS], m_db[BANDS];
bool m_low_shelf, m_high_shelf;
std::array<filter, BANDS> m_filter;
std::vector<std::array<history, BANDS+1>> m_history;
bool m_isset_mode, m_isset_low_shelf, m_isset_high_shelf;
bool m_isset_q[BANDS], m_isset_f[BANDS], m_isset_db[BANDS];
void build_filter(u32 band);
void build_low_shelf(u32 band);
void build_high_shelf(u32 band);
void build_peak(u32 band);
};
#endif
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