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- extends Node
- # Keep the number of samples per second to mix low, as GDScript is not super fast.
- var sample_hz := 22050.0
- var pulse_hz := 440.0
- var phase := 0.0
- # Actual playback stream, assigned in _ready().
- var playback: AudioStreamPlayback
- func _fill_buffer() -> void:
- var increment := pulse_hz / sample_hz
- var to_fill: int = playback.get_frames_available()
- while to_fill > 0:
- playback.push_frame(Vector2.ONE * sin(phase * TAU)) # Audio frames are stereo.
- phase = fmod(phase + increment, 1.0)
- to_fill -= 1
- func _process(_delta: float) -> void:
- _fill_buffer()
- func _ready() -> void:
- # Setting mix rate is only possible before play().
- $Player.stream.mix_rate = sample_hz
- $Player.play()
- playback = $Player.get_stream_playback()
- # `_fill_buffer` must be called *after* setting `playback`,
- # as `fill_buffer` uses the `playback` member variable.
- _fill_buffer()
- func _on_frequency_h_slider_value_changed(value: float) -> void:
- %FrequencyLabel.text = "%d Hz" % value
- pulse_hz = value
- func _on_volume_h_slider_value_changed(value: float) -> void:
- # Use `linear_to_db()` to get a volume slider that matches perceptual human hearing.
- %VolumeLabel.text = "%.2f dB" % linear_to_db(value)
- $Player.volume_db = linear_to_db(value)
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