b21c69c60e
# Objective - Add ways to control how audio is played ## Solution - playing a sound will return a (weak) handle to an asset that can be used to control playback - if the asset is dropped, it will detach the sink (same behaviour as now)
66 lines
1.8 KiB
Rust
66 lines
1.8 KiB
Rust
use bevy::{audio::AudioSink, prelude::*};
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/// This example illustrates how to load and play an audio file, and control how it's played
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins)
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.add_startup_system(setup)
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.add_system(update_speed)
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.add_system(pause)
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.add_system(volume)
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.run();
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}
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fn setup(
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mut commands: Commands,
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asset_server: Res<AssetServer>,
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audio: Res<Audio>,
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audio_sinks: Res<Assets<AudioSink>>,
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) {
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let music = asset_server.load("sounds/Windless Slopes.ogg");
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let handle = audio_sinks.get_handle(audio.play(music));
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commands.insert_resource(MusicController(handle));
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}
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struct MusicController(Handle<AudioSink>);
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fn update_speed(
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audio_sinks: Res<Assets<AudioSink>>,
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music_controller: Res<MusicController>,
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time: Res<Time>,
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) {
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if let Some(sink) = audio_sinks.get(&music_controller.0) {
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sink.set_speed(((time.seconds_since_startup() / 5.0).sin() as f32 + 1.0).max(0.1));
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}
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}
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fn pause(
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keyboard_input: Res<Input<KeyCode>>,
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audio_sinks: Res<Assets<AudioSink>>,
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music_controller: Res<MusicController>,
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) {
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if keyboard_input.just_pressed(KeyCode::Space) {
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if let Some(sink) = audio_sinks.get(&music_controller.0) {
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if sink.is_paused() {
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sink.play()
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} else {
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sink.pause()
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}
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}
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}
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}
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fn volume(
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keyboard_input: Res<Input<KeyCode>>,
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audio_sinks: Res<Assets<AudioSink>>,
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music_controller: Res<MusicController>,
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) {
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if let Some(sink) = audio_sinks.get(&music_controller.0) {
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if keyboard_input.just_pressed(KeyCode::Plus) {
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sink.set_volume(sink.volume() + 0.1);
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} else if keyboard_input.just_pressed(KeyCode::Minus) {
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sink.set_volume(sink.volume() - 0.1);
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}
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}
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}
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