<?xml version="1.0" encoding="UTF-8" ?>
<class name="AudioEffectSpectrumAnalyzer" inherits="AudioEffect" api_type="core" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
	<brief_description>
		Creates an [AudioEffectInstance] which performs frequency analysis and exposes results to be accessed in real-time.
	</brief_description>
	<description>
		Calculates a Fourier Transform of the audio signal. This effect does not alter the audio. Can be used for creating real-time audio visualizations, like a spectrogram.
		This resource configures an [AudioEffectSpectrumAnalyzerInstance], which performs the actual analysis at runtime. An instance should be obtained with [method AudioServer.get_bus_effect_instance] to make use of this effect.
	</description>
	<tutorials>
		<link title="Audio buses">$DOCS_URL/tutorials/audio/audio_buses.html</link>
		<link title="Audio effects">$DOCS_URL/tutorials/audio/audio_effects.html</link>
		<link title="Audio Spectrum Visualizer Demo">https://godotengine.org/asset-library/asset/2762</link>
	</tutorials>
	<members>
		<member name="buffer_length" type="float" setter="set_buffer_length" getter="get_buffer_length" default="2.0">
			The length of the buffer to keep, in seconds. Higher values keep data around for longer, but require more memory. Value can range from 0.1 to 4.
		</member>
		<member name="fft_size" type="int" setter="set_fft_size" getter="get_fft_size" enum="AudioEffectSpectrumAnalyzer.FFTSize" default="2">
			The size of the [url=https://en.wikipedia.org/wiki/Fast_Fourier_transform]Fast Fourier transform[/url] buffer. Higher values smooth out the spectrum analysis over time, but have greater latency. The effects of this higher latency are especially noticeable with sudden amplitude changes.
		</member>
	</members>
	<constants>
		<constant name="FFT_SIZE_256" value="0" enum="FFTSize">
			Use a buffer of 256 samples for the Fast Fourier transform. Lowest latency, but least stable over time.
		</constant>
		<constant name="FFT_SIZE_512" value="1" enum="FFTSize">
			Use a buffer of 512 samples for the Fast Fourier transform. Low latency, but less stable over time.
		</constant>
		<constant name="FFT_SIZE_1024" value="2" enum="FFTSize">
			Use a buffer of 1024 samples for the Fast Fourier transform. This is a compromise between latency and stability over time.
		</constant>
		<constant name="FFT_SIZE_2048" value="3" enum="FFTSize">
			Use a buffer of 2048 samples for the Fast Fourier transform. High latency, but stable over time.
		</constant>
		<constant name="FFT_SIZE_4096" value="4" enum="FFTSize">
			Use a buffer of 4096 samples for the Fast Fourier transform. Highest latency, but most stable over time.
		</constant>
		<constant name="FFT_SIZE_MAX" value="5" enum="FFTSize">
			Represents the size of the [enum FFTSize] enum.
		</constant>
	</constants>
</class>
