godot-docs/classes/class_audioeffectspectrumanalyzer.rst

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.. _class_AudioEffectSpectrumAnalyzer:

AudioEffectSpectrumAnalyzer
===========================

**Inherits:** :ref:`AudioEffect<class_AudioEffect>` **<** :ref:`Resource<class_Resource>` **<** :ref:`Reference<class_Reference>` **<** :ref:`Object<class_Object>`

Audio effect that can be used for real-time audio visualizations.

.. rst-class:: classref-introduction-group

Description
-----------

This audio effect does not affect sound output, but can be used for real-time audio visualizations.

See also :ref:`AudioStreamGenerator<class_AudioStreamGenerator>` for procedurally generating sounds.

.. rst-class:: classref-introduction-group

Tutorials
---------

- `Audio Spectrum Demo <https://godotengine.org/asset-library/asset/528>`__

- `Godot 3.2 will get new audio features <https://godotengine.org/article/godot-32-will-get-new-audio-features>`__

.. rst-class:: classref-reftable-group

Properties
----------

.. table::
   :widths: auto

   +------------------------------------------------------------+--------------------------------------------------------------------------------+----------+
   | :ref:`float<class_float>`                                  | :ref:`buffer_length<class_AudioEffectSpectrumAnalyzer_property_buffer_length>` | ``2.0``  |
   +------------------------------------------------------------+--------------------------------------------------------------------------------+----------+
   | :ref:`FFT_Size<enum_AudioEffectSpectrumAnalyzer_FFT_Size>` | :ref:`fft_size<class_AudioEffectSpectrumAnalyzer_property_fft_size>`           | ``2``    |
   +------------------------------------------------------------+--------------------------------------------------------------------------------+----------+
   | :ref:`float<class_float>`                                  | :ref:`tap_back_pos<class_AudioEffectSpectrumAnalyzer_property_tap_back_pos>`   | ``0.01`` |
   +------------------------------------------------------------+--------------------------------------------------------------------------------+----------+

.. rst-class:: classref-section-separator

----

.. rst-class:: classref-descriptions-group

Enumerations
------------

.. _enum_AudioEffectSpectrumAnalyzer_FFT_Size:

.. rst-class:: classref-enumeration

enum **FFT_Size**:

.. _class_AudioEffectSpectrumAnalyzer_constant_FFT_SIZE_256:

.. rst-class:: classref-enumeration-constant

:ref:`FFT_Size<enum_AudioEffectSpectrumAnalyzer_FFT_Size>` **FFT_SIZE_256** = ``0``

Use a buffer of 256 samples for the Fast Fourier transform. Lowest latency, but least stable over time.

.. _class_AudioEffectSpectrumAnalyzer_constant_FFT_SIZE_512:

.. rst-class:: classref-enumeration-constant

:ref:`FFT_Size<enum_AudioEffectSpectrumAnalyzer_FFT_Size>` **FFT_SIZE_512** = ``1``

Use a buffer of 512 samples for the Fast Fourier transform. Low latency, but less stable over time.

.. _class_AudioEffectSpectrumAnalyzer_constant_FFT_SIZE_1024:

.. rst-class:: classref-enumeration-constant

:ref:`FFT_Size<enum_AudioEffectSpectrumAnalyzer_FFT_Size>` **FFT_SIZE_1024** = ``2``

Use a buffer of 1024 samples for the Fast Fourier transform. This is a compromise between latency and stability over time.

.. _class_AudioEffectSpectrumAnalyzer_constant_FFT_SIZE_2048:

.. rst-class:: classref-enumeration-constant

:ref:`FFT_Size<enum_AudioEffectSpectrumAnalyzer_FFT_Size>` **FFT_SIZE_2048** = ``3``

Use a buffer of 2048 samples for the Fast Fourier transform. High latency, but stable over time.

.. _class_AudioEffectSpectrumAnalyzer_constant_FFT_SIZE_4096:

.. rst-class:: classref-enumeration-constant

:ref:`FFT_Size<enum_AudioEffectSpectrumAnalyzer_FFT_Size>` **FFT_SIZE_4096** = ``4``

Use a buffer of 4096 samples for the Fast Fourier transform. Highest latency, but most stable over time.

.. _class_AudioEffectSpectrumAnalyzer_constant_FFT_SIZE_MAX:

.. rst-class:: classref-enumeration-constant

:ref:`FFT_Size<enum_AudioEffectSpectrumAnalyzer_FFT_Size>` **FFT_SIZE_MAX** = ``5``

Represents the size of the :ref:`FFT_Size<enum_AudioEffectSpectrumAnalyzer_FFT_Size>` enum.

.. rst-class:: classref-section-separator

----

.. rst-class:: classref-descriptions-group

Property Descriptions
---------------------

.. _class_AudioEffectSpectrumAnalyzer_property_buffer_length:

.. rst-class:: classref-property

:ref:`float<class_float>` **buffer_length** = ``2.0``

.. rst-class:: classref-property-setget

- void **set_buffer_length** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_buffer_length** **(** **)**

The length of the buffer to keep (in seconds). Higher values keep data around for longer, but require more memory.

.. rst-class:: classref-item-separator

----

.. _class_AudioEffectSpectrumAnalyzer_property_fft_size:

.. rst-class:: classref-property

:ref:`FFT_Size<enum_AudioEffectSpectrumAnalyzer_FFT_Size>` **fft_size** = ``2``

.. rst-class:: classref-property-setget

- void **set_fft_size** **(** :ref:`FFT_Size<enum_AudioEffectSpectrumAnalyzer_FFT_Size>` value **)**
- :ref:`FFT_Size<enum_AudioEffectSpectrumAnalyzer_FFT_Size>` **get_fft_size** **(** **)**

The size of the `Fast Fourier transform <https://en.wikipedia.org/wiki/Fast_Fourier_transform>`__ 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.

.. rst-class:: classref-item-separator

----

.. _class_AudioEffectSpectrumAnalyzer_property_tap_back_pos:

.. rst-class:: classref-property

:ref:`float<class_float>` **tap_back_pos** = ``0.01``

.. rst-class:: classref-property-setget

- void **set_tap_back_pos** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_tap_back_pos** **(** **)**

.. container:: contribute

	There is currently no description for this property. Please help us by :ref:`contributing one <doc_updating_the_class_reference>`!

.. |virtual| replace:: :abbr:`virtual (This method should typically be overridden by the user to have any effect.)`
.. |const| replace:: :abbr:`const (This method has no side effects. It doesn't modify any of the instance's member variables.)`
.. |vararg| replace:: :abbr:`vararg (This method accepts any number of arguments after the ones described here.)`
.. |static| replace:: :abbr:`static (This method doesn't need an instance to be called, so it can be called directly using the class name.)`