NPAPI:AudioControl

Status

Drafting.

Contributors

• Last modified: June 1, 2015
• Authors: Kyle Huey (Mozilla), Benoit Girard (Mozilla)
• Contributors:

Changes

Modified in 2015 to be push API instead of a pull API and to use Get/SetValue.

Use case

The ability to mute/unmute tabs or determine which tabs are playing audio is a commonly requested feature in web browsers. This specification allows browsers to mute/unmute instances of cooperating plugins and determine which instances are playing audio. Browsers can use these APIs to implement per-tab audio control.

Proposed Specification

Determine if an instance is playing audio

NPPVpluginIsPlayingAudio = 4000

This NPPVariable, when set via NPN_SetValue, will let the plugin instance signal via a BOOL if the current instance is currently playing audio.

Mute/Unmute a plugin instance

NPNVmuteAudioBool = 4000

This NPNVariable, when set via NPP_SetValue, will let the browser notify the plugin that it should mute audio for the current plugin instance.

Open issues

• Will we want to be able to control the volume level on a per instance basis? This seems unnecessarily complicated.