This example processes framebuffer data from the Mozilla Audio Data API MozAudioAvailable event. The Fast Fourier Transform algorithm is used to obtain audio frequency levels which are then charted in a canvas element.
This page is part of the BBC R&D blog post The Mozilla Audio Data API: what do the numbers mean?.
Please note that Firefox 4 is required to run the code on this page.
The video clip is edited from the Wellcome Trust Tree of Life animation and is used and made available under the Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 Unported licence.
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.