Audio in WebGL is done differently then on all other platforms. On other platforms we use FMOD internally to supply audio playback and mixing. Since the WebGL platform does not support threads, we need to use a different implementation, which is internally based on the Web Audio API, which lets the browser handle audio playback and mixing for us.
Unfortunately, this limits audio functionality in Unity WebGL to supporting only the most basic features. This page will document what is expected to work. Anything not listed here is not currently supported on WebGL.
Audio sources support basic positional audio playback with pausing and resuming, panning, rolloff, pitch setting, and doppler effect support.
AudioSource APIs are supported:
pitch(Note that only positive values for pitch are supported.)
AudioListener APIs are supported.
Audio clips in WebGL will always be imported in the AAC format, as that is widely supported by different browsers.
The following All
AudioClip APIs are supported.
APIs are supported:
AudioClip.Createis supported partially: it will only work if the streaming parameter is set to false and the complete audio samples can be loaded at the time AudioClip.Create is called. It will then create the clip and load all samples before returning control.
AudioClip.SetDatais supported partially: it will only work for replacing the entire contents of the AudioClip. The
offsetSamplesparameter is ignored.
SystemInfo.supportsAudio is not implemented on WebGL and always returns true.
Microphone class is not supported in WebGL.