52 lines
1.2 KiB
C++
52 lines
1.2 KiB
C++
#include <psemek/audio/effect/volume_base.hpp>
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#include <psemek/audio/constants.hpp>
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#include <psemek/audio/attack.hpp>
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#include <cmath>
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namespace psemek::audio
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{
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volume_base::volume_base(float gain, float attack)
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: gain_{gain}
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, attack_multiplier_{attack_to_multiplier(attack)}
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, real_gain_{gain}
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, last_sample_src_{0.f, 0.f}
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, last_sample_tgt_{0.f, 0.f}
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{}
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float volume_base::attack() const
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{
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return multiplier_to_attack(attack_multiplier_.load());
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}
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float volume_base::attack(float value)
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{
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auto old = attack_multiplier_.exchange(attack_to_multiplier(value));
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return multiplier_to_attack(old);
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}
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void volume_base::apply(float * data, std::size_t sample_count)
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{
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float gain = gain_.load();
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float attack_multiplier = attack_multiplier_.load();
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auto apply_impl = [this](float & target, float & last_src, float & last_tgt)
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{
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auto old = target;
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target = last_tgt + (old - last_src) * real_gain_;
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last_src = old;
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last_tgt = target;
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};
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auto end = data + sample_count;
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for (auto p = data; p < end;)
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{
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apply_impl(*p++, last_sample_src_[0], last_sample_tgt_[0]);
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apply_impl(*p++, last_sample_src_[1], last_sample_tgt_[1]);
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attack_update(real_gain_, gain, attack_multiplier);
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}
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}
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}
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