Intent to Implement and Ship: WebAudio cancelAndHoldAtTime AudioParam automation method
Raymond Toy
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Contact emails
rt...@chromium.org, hong...@chromium.org
Spec
http://webaudio.github.io/web-audio-api/
Summary
Add a new AudioParam automation method, cancelAndHoldAtTime, to cancel all automations after a given time and to hold the value of the parameter with the value at that time.
Motivation
See https://github.com/WebAudio/web-audio-api/issues/344 for a more complete discussion and motivation for adding this method.
Briefly, the new method greatly simplifies handling of canceling automations, especially if the automation is currently running. Without this method, the developer would have to compute the actual value of the automation and set the value directly himself for all the nodes that need to be changed. The algorithm given in https://webaudio.github.io/web-audio-api/#widl-AudioParam-cancelAndHoldAtTime-AudioParam-double-cancelTime shows how complicated in general it would be for the developer to do.
Interoperability and Compatibility Risk
As a new method, there is no compatibility risk. We fully expect all browsers to implement this method consistently since the precise algorithm is part of the specification.
Ongoing technical constraints
None
Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?
Yes.
OWP launch tracking bug
Link to entry on the feature dashboard
https://www.chromestatus.com/features/5116894524735488
Requesting approval to ship?
Yes
Chris Harrelson
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TAMURA, Kent
Software Engineer, Google
林澔澔
Raymond Toy於 2016年12月8日星期四 UTC+8上午12時36分06秒寫道：
Philip Jägenstedt
LGTM2
LGTM1 again.
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