WebAudio: ConvolverNode.channelCount and channelCountMode

Category: Multimedia
Type: New or changed feature
Status: Enabled by default (Chrome 81)
Intent stage: Evaluate readiness to ship

Summary

For a ConvolverNode, the channelCount can now be set to 1 or 2. The channelCountMode can be "explicit" or "clamped-max". Previously, a channelCount of 1 was not allowed and neither was a mode of "explicit".

Motivation

Extends ConvolverNode capabilities slightly to allow developers to choose the desired behavior without having to add a GainNode to do the desired mixing.

Standards & signals

Specification: https://webaudio.github.io/web-audio-api/#audionode
Firefox: No signal — Issue was filed by Mozilla engineer with agreement from another Mozilla engineer.
Safari: No signal
Web developers: No signals
Tracking bug: https://crbug.com/1021552

Docs: https://webaudio.github.io/web-audio-api/#dom-audionode-channelcount https://webaudio.github.io/web-audio-api/#dom-audionode-channelcountmode

Explainers: https://github.com/WebAudio/web-audio-api/issues/2050

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