Calling AudioRenderCapacity.start multiple times

[orottier]

Describe the issue

Reading the AudioRenderCapacity spec, it is unclear to me what the behaviour should be when calling start repeatedly. Should it:

• ignore subsequent calls
• update the update interval to the latest setting
• spawn another metric collection callback

Where Is It

https://webaudio.github.io/web-audio-api/#ref-for-dom-audiorendercapacity-start

Starts metric collection and analysis. This will repeatedly fire an event named update at AudioRenderCapacity, using AudioRenderCapacityEvent, with the given update interval in AudioRenderCapacityOptions.

Additional Information

None

[hoch]

The second option looks reasonable. I'll work on PR for the updated spec text.

[mdjp]

Proposal, reset clock and apply new options with subsequent calls. (option 2)

[hoch]

Teleconference 4/20: We had a bit more discussion on this, but there still are issues to resolve.

For example, when calling start() with the same interval value, we cannot distinguish if the next callback is from the previous onset or the latest one. We should look at the requestAnimationFrame algorithm or setTimeout for a solution:
https://html.spec.whatwg.org/multipage/imagebitmap-and-animations.html#dom-animationframeprovider-requestanimationframe