Intent to ship: Audio Output Devices API

[Karl Tomlinson]

As of Firefox 116, I intend to turn the Audio Output Devices API on by default on desktop platforms. It has been developed behind the media.setsinkid.enabled preference, which has been enabled on Nightly since January. Status in other browsers is

• Chrome shipped an implementation of the Audio Output Device API in version 49, before the API included selectAudioOutput() to allow sites to select speakers without having permission to use microphones, and still does not have selectAudioOutput().
• Safari Technology Preview 115 included a similar subset of the API. This is still part of "ExposeSpeakersEnabled" and "PerElementSpeakerSelectionEnabled" experimental features.  Public bug: https://bugs.webkit.org/show_bug.cgi?id=216641

Bug to turn on by default: 1498512

Standard: Audio Output Devices API

This feature was previously discussed in this "Intent to prototype" thread: https://groups.google.com/a/mozilla.org/g/dev-platform/c/dUvw_czB8Uk/m/qDnrYsKVBAAJ