With 5.1 channel config, audio will be only on the left side

[NoXPhasma]

When I run my audio configuration to be 5.1 channels, the addon forces the audio to be only on the left side (front left and rear left speaker). Using Pan will change the volume between the front left and rear left speaker.

Set the audio channels to Stereo and restart Firefox fixes this and the addon works like expected. I haven't took a closer look to the addon itself, but I guess you assume the user only has 2 channels.

Firefox Nightly x64
Operating System: Linux Mint 18.2
Addon Version: 1.0.1

[valpackett]

Yeah, I have no idea about 5.1, I only use headphones. This extension just uses StereoPanner which should output left and right.

The browser should upmix using left and right:

2 -> 5.1 : up-mix from stereo to 5.1
        output.L = input.L;
        output.R = input.R;
        output.C = 0;
        output.LFE = 0;
        output.SL = 0;
        output.SR = 0;

Maybe it's a bug in Firefox… Also, are your speakers plugged in correctly? :)

[NoXPhasma]

Yes, my speakers are plugged correctly, an audio test sends the sounds to the correct channels. Also Stereo panning works when I change the channel options to Stereo. :)

The browser should upmix using left and right:

Yes, Firefox does that, as long as I don't have the Addon installed. Firefox also knows my available Sound devices and their channel configuration:

[valpackett]

Firefox does that

I mean in Web Audio, not just when playing a media file.

[NoXPhasma]

Maybe it's a bug in the WebAudio implementation of Firefox, this is the first time I've had this wrong channel order in Firefox.