65 lines
1.1 KiB
C++
65 lines
1.1 KiB
C++
#include <psemek/audio/effect/distortion.hpp>
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#include <cmath>
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#include <atomic>
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namespace psemek::audio
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{
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namespace
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{
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struct distortion_impl
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: distortion_control
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{
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distortion_impl(stream_ptr stream, float strength)
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: stream_(std::move(stream))
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, strength_(strength)
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{}
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float strength() const override
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{
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return strength_.load();
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}
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float strength(float value) override
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{
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return strength_.exchange(value);
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}
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std::optional<std::size_t> length() const override
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{
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return stream_->length();
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}
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std::size_t read(float * data, std::size_t sample_count) override
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{
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auto result = stream_->read(data, sample_count);
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float strength = strength_.load();
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for (std::size_t i = 0; i < result; ++i)
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{
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data[i] = std::tanh(strength * data[i]);
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}
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return result;
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}
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std::size_t played() const override
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{
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return stream_->played();
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}
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private:
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stream_ptr stream_;
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std::atomic<float> strength_;
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};
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}
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stream_ptr distortion(stream_ptr stream, float strength)
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{
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return std::make_shared<distortion_impl>(std::move(stream), strength);
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}
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}
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