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Update audio example

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This commit is contained in:
Nikita Lisitsa 2022-10-05 20:57:44 +03:00
parent 6c213f9c45
commit 21b2028122
1 changed files with 22 additions and 12 deletions
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34
examples/audio.cpp
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@ -5,9 +5,13 @@
#include <psemek/audio/wave/square.hpp> #include <psemek/audio/wave/square.hpp>
#include <psemek/audio/wave/triangle.hpp> #include <psemek/audio/wave/triangle.hpp>
#include <psemek/audio/effect/volume.hpp> #include <psemek/audio/effect/volume.hpp>
#include <psemek/audio/duplicate.hpp>
#include <psemek/audio/stereo.hpp>
#include <psemek/audio/mixer.hpp> #include <psemek/audio/mixer.hpp>
#include <psemek/app/app.hpp> #include <psemek/app/app.hpp>
#include <psemek/app/main.hpp> #include <psemek/app/main.hpp>
#include <psemek/util/clock.hpp>
#include <psemek/geom/constants.hpp>
#include <map> #include <map>
@ -35,18 +39,12 @@ struct audio_app
: app::app("Audio example") : app::app("Audio example")
{ {
mixer_ = audio::make_mixer(); mixer_ = audio::make_mixer();
engine_.output(mixer_);
auto volume = audio::volume(audio::sine_wave(440.f), 1.f, 0.01f); auto [ dup1, dup2 ] = audio::duplicate(mixer_);
auto channel = mixer_->add(volume); left_volume_ = audio::volume(dup1, 0.f, 0.1f);
std::this_thread::sleep_for(std::chrono::seconds{1}); right_volume_ = audio::volume(dup2, 0.f, 0.1f);
volume->gain(0.5f); auto result = audio::stereo(left_volume_, right_volume_);
std::this_thread::sleep_for(std::chrono::seconds{1}); engine_.output(result);
volume->gain(0.25f);
std::this_thread::sleep_for(std::chrono::seconds{1});
volume->gain(0.125f);
std::this_thread::sleep_for(std::chrono::seconds{1});
channel->stop();
} }
void on_key_down(SDL_Keycode key) override void on_key_down(SDL_Keycode key) override
@ -57,7 +55,7 @@ struct audio_app
{ {
int midi = key_to_midi.at(key); int midi = key_to_midi.at(key);
auto tone = audio::sine_wave(440.f * std::pow(2.f, (midi - 69) / 12.f)); auto tone = audio::sine_wave(440.f * std::pow(2.f, (midi - 69) / 12.f));
channels_[key] = mixer_->add(audio::volume(tone, 0.5f)); channels_[key] = mixer_->add(tone);
} }
} }
@ -72,10 +70,22 @@ struct audio_app
} }
} }
void update() override
{
float const time = clock_.count();
float volume = std::sin(time);
left_volume_->gain(0.5f + 0.5f * volume);
right_volume_->gain(0.5f - 0.5f * volume);
}
private: private:
audio::engine engine_; audio::engine engine_;
audio::mixer_ptr mixer_; audio::mixer_ptr mixer_;
std::shared_ptr<audio::volume_control> left_volume_, right_volume_;
std::map<SDL_Keycode, audio::mixer::channel_ptr> channels_; std::map<SDL_Keycode, audio::mixer::channel_ptr> channels_;
util::clock<> clock_;
}; };
int main() int main()