diff options
Diffstat (limited to 'src/emu/audio_effects/eq.h')
-rw-r--r-- | src/emu/audio_effects/eq.h | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/src/emu/audio_effects/eq.h b/src/emu/audio_effects/eq.h new file mode 100644 index 00000000000..919d5292837 --- /dev/null +++ b/src/emu/audio_effects/eq.h @@ -0,0 +1,84 @@ +// 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 |