WebAudio: MediaElement and MediaStream nodes defined only for AudioContext

Chrome historically allowed creation of MediaElementAudioSourceNode's, MediaStreamAudioSourceNode's, and MediaStreamAudioDestinationNode's using an OfflineAudioContext. This does not comply with the spec; these nodes should only be available for an AudioContext. The behavior with an OfflineAudioContext is not well-defined and contrary to the real-time nature of the nodes themselves. Thus, only allow these nodes to be constructed for an AudioContext.

Documentation

• https://webaudio.github.io/web-audio-api/#mediaelementaudiosourcenode
• https://webaudio.github.io/web-audio-api/#mediastreamaudiosourcenode
• https://webaudio.github.io/web-audio-api/#mediastreamtrackaudiosourcenode
• https://webaudio.github.io/web-audio-api/#mediastreamaudiodestinationnode

Specification

Editor's draft

Status in Chromium

Blink components: Blink>WebAudio

Enabled by default (tracking bug) in:

• Chrome for desktop release 71
• Chrome for Android release 71
• Chrome for iOS release 71
• Opera release 58
• Opera for Android release 58

Consensus & Standardization

• Firefox: Shipped
• Edge: No public signals
• Safari: No public signals
• Web Developers: No signals

Owners

• rtoy@chromium.org
• hoch@chromium.org

Last updated on 2018-08-28