godot-docs/classes/class_audiostreamwav.rst

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.. XML source: https://github.com/godotengine/godot/tree/master/doc/classes/AudioStreamWAV.xml.

.. _class_AudioStreamWAV:

AudioStreamWAV
==============

**Inherits:** :ref:`AudioStream<class_AudioStream>` **<** :ref:`Resource<class_Resource>` **<** :ref:`RefCounted<class_RefCounted>` **<** :ref:`Object<class_Object>`

Stores audio data loaded from WAV files.

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

AudioStreamWAV stores sound samples loaded from WAV files. To play the stored sound, use an :ref:`AudioStreamPlayer<class_AudioStreamPlayer>` (for non-positional audio) or :ref:`AudioStreamPlayer2D<class_AudioStreamPlayer2D>`/:ref:`AudioStreamPlayer3D<class_AudioStreamPlayer3D>` (for positional audio). The sound can be looped.

This class can also be used to store dynamically-generated PCM audio data. See also :ref:`AudioStreamGenerator<class_AudioStreamGenerator>` for procedural audio generation.

Properties
----------

+-----------------------------------------------+-------------------------------------------------------------+-----------------------+
| :ref:`PackedByteArray<class_PackedByteArray>` | :ref:`data<class_AudioStreamWAV_property_data>`             | ``PackedByteArray()`` |
+-----------------------------------------------+-------------------------------------------------------------+-----------------------+
| :ref:`Format<enum_AudioStreamWAV_Format>`     | :ref:`format<class_AudioStreamWAV_property_format>`         | ``0``                 |
+-----------------------------------------------+-------------------------------------------------------------+-----------------------+
| :ref:`int<class_int>`                         | :ref:`loop_begin<class_AudioStreamWAV_property_loop_begin>` | ``0``                 |
+-----------------------------------------------+-------------------------------------------------------------+-----------------------+
| :ref:`int<class_int>`                         | :ref:`loop_end<class_AudioStreamWAV_property_loop_end>`     | ``0``                 |
+-----------------------------------------------+-------------------------------------------------------------+-----------------------+
| :ref:`LoopMode<enum_AudioStreamWAV_LoopMode>` | :ref:`loop_mode<class_AudioStreamWAV_property_loop_mode>`   | ``0``                 |
+-----------------------------------------------+-------------------------------------------------------------+-----------------------+
| :ref:`int<class_int>`                         | :ref:`mix_rate<class_AudioStreamWAV_property_mix_rate>`     | ``44100``             |
+-----------------------------------------------+-------------------------------------------------------------+-----------------------+
| :ref:`bool<class_bool>`                       | :ref:`stereo<class_AudioStreamWAV_property_stereo>`         | ``false``             |
+-----------------------------------------------+-------------------------------------------------------------+-----------------------+

Methods
-------

+---------------------------------------+----------------------------------------------------------------------------------------------------------+
| :ref:`Error<enum_@GlobalScope_Error>` | :ref:`save_to_wav<class_AudioStreamWAV_method_save_to_wav>` **(** :ref:`String<class_String>` path **)** |
+---------------------------------------+----------------------------------------------------------------------------------------------------------+

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

.. _enum_AudioStreamWAV_Format:

.. _class_AudioStreamWAV_constant_FORMAT_8_BITS:

.. _class_AudioStreamWAV_constant_FORMAT_16_BITS:

.. _class_AudioStreamWAV_constant_FORMAT_IMA_ADPCM:

enum **Format**:

- **FORMAT_8_BITS** = **0** --- 8-bit audio codec.

- **FORMAT_16_BITS** = **1** --- 16-bit audio codec.

- **FORMAT_IMA_ADPCM** = **2** --- Audio is compressed using IMA ADPCM.

----

.. _enum_AudioStreamWAV_LoopMode:

.. _class_AudioStreamWAV_constant_LOOP_DISABLED:

.. _class_AudioStreamWAV_constant_LOOP_FORWARD:

.. _class_AudioStreamWAV_constant_LOOP_PINGPONG:

.. _class_AudioStreamWAV_constant_LOOP_BACKWARD:

enum **LoopMode**:

- **LOOP_DISABLED** = **0** --- Audio does not loop.

- **LOOP_FORWARD** = **1** --- Audio loops the data between :ref:`loop_begin<class_AudioStreamWAV_property_loop_begin>` and :ref:`loop_end<class_AudioStreamWAV_property_loop_end>`, playing forward only.

- **LOOP_PINGPONG** = **2** --- Audio loops the data between :ref:`loop_begin<class_AudioStreamWAV_property_loop_begin>` and :ref:`loop_end<class_AudioStreamWAV_property_loop_end>`, playing back and forth.

- **LOOP_BACKWARD** = **3** --- Audio loops the data between :ref:`loop_begin<class_AudioStreamWAV_property_loop_begin>` and :ref:`loop_end<class_AudioStreamWAV_property_loop_end>`, playing backward only.

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

.. _class_AudioStreamWAV_property_data:

- :ref:`PackedByteArray<class_PackedByteArray>` **data**

+-----------+-----------------------+
| *Default* | ``PackedByteArray()`` |
+-----------+-----------------------+
| *Setter*  | set_data(value)       |
+-----------+-----------------------+
| *Getter*  | get_data()            |
+-----------+-----------------------+

Contains the audio data in bytes.

\ **Note:** This property expects signed PCM8 data. To convert unsigned PCM8 to signed PCM8, subtract 128 from each byte.

----

.. _class_AudioStreamWAV_property_format:

- :ref:`Format<enum_AudioStreamWAV_Format>` **format**

+-----------+-------------------+
| *Default* | ``0``             |
+-----------+-------------------+
| *Setter*  | set_format(value) |
+-----------+-------------------+
| *Getter*  | get_format()      |
+-----------+-------------------+

Audio format. See :ref:`Format<enum_AudioStreamWAV_Format>` constants for values.

----

.. _class_AudioStreamWAV_property_loop_begin:

- :ref:`int<class_int>` **loop_begin**

+-----------+-----------------------+
| *Default* | ``0``                 |
+-----------+-----------------------+
| *Setter*  | set_loop_begin(value) |
+-----------+-----------------------+
| *Getter*  | get_loop_begin()      |
+-----------+-----------------------+

The loop start point (in number of samples, relative to the beginning of the sample). This information will be imported automatically from the WAV file if present.

----

.. _class_AudioStreamWAV_property_loop_end:

- :ref:`int<class_int>` **loop_end**

+-----------+---------------------+
| *Default* | ``0``               |
+-----------+---------------------+
| *Setter*  | set_loop_end(value) |
+-----------+---------------------+
| *Getter*  | get_loop_end()      |
+-----------+---------------------+

The loop end point (in number of samples, relative to the beginning of the sample). This information will be imported automatically from the WAV file if present.

----

.. _class_AudioStreamWAV_property_loop_mode:

- :ref:`LoopMode<enum_AudioStreamWAV_LoopMode>` **loop_mode**

+-----------+----------------------+
| *Default* | ``0``                |
+-----------+----------------------+
| *Setter*  | set_loop_mode(value) |
+-----------+----------------------+
| *Getter*  | get_loop_mode()      |
+-----------+----------------------+

The loop mode. This information will be imported automatically from the WAV file if present. See :ref:`LoopMode<enum_AudioStreamWAV_LoopMode>` constants for values.

----

.. _class_AudioStreamWAV_property_mix_rate:

- :ref:`int<class_int>` **mix_rate**

+-----------+---------------------+
| *Default* | ``44100``           |
+-----------+---------------------+
| *Setter*  | set_mix_rate(value) |
+-----------+---------------------+
| *Getter*  | get_mix_rate()      |
+-----------+---------------------+

The sample rate for mixing this audio. Higher values require more storage space, but result in better quality.

In games, common sample rates in use are ``11025``, ``16000``, ``22050``, ``32000``, ``44100``, and ``48000``.

According to the `Nyquist-Shannon sampling theorem <https://en.wikipedia.org/wiki/Nyquist%E2%80%93Shannon_sampling_theorem>`__, there is no quality difference to human hearing when going past 40,000 Hz (since most humans can only hear up to ~20,000 Hz, often less). If you are using lower-pitched sounds such as voices, lower sample rates such as ``32000`` or ``22050`` may be usable with no loss in quality.

----

.. _class_AudioStreamWAV_property_stereo:

- :ref:`bool<class_bool>` **stereo**

+-----------+-------------------+
| *Default* | ``false``         |
+-----------+-------------------+
| *Setter*  | set_stereo(value) |
+-----------+-------------------+
| *Getter*  | is_stereo()       |
+-----------+-------------------+

If ``true``, audio is stereo.

Method Descriptions
-------------------

.. _class_AudioStreamWAV_method_save_to_wav:

- :ref:`Error<enum_@GlobalScope_Error>` **save_to_wav** **(** :ref:`String<class_String>` path **)**

Saves the AudioStreamWAV as a WAV file to ``path``. Samples with IMA ADPCM format can't be saved.

\ **Note:** A ``.wav`` extension is automatically appended to ``path`` if it is missing.

.. |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.)`
.. |constructor| replace:: :abbr:`constructor (This method is used to construct a type.)`
.. |static| replace:: :abbr:`static (This method doesn't need an instance to be called, so it can be called directly using the class name.)`
.. |operator| replace:: :abbr:`operator (This method describes a valid operator to use with this type as left-hand operand.)`