1385556 - Web audio api 5.1 surround example not working in firefox

Status: RESOLVED DUPLICATE of bug 1378070

(Core :: Web Audio, defect)

Description

[tomvalkeneers]

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:54.0) Gecko/20100101 Firefox/54.0
Build ID: 20170612122443

Steps to reproduce:

A few days ago i started to experiment with a surround set. When i was trying surround audio in the web audio api i came to notice that my example works fine in Chrome v59 but not in Firefox v54.

js code:

// create web audio api context
var audioCtx = new (window.AudioContext || window.webkitAudioContext)();
audioCtx.destination.channelInterpretation = 'discrete';
audioCtx.destination.channelCountMode = 'explicit';
audioCtx.destination.channelCount = 6;


var oscillators = [];

var merger = audioCtx.createChannelMerger(6);

console.log(audioCtx.destination, merger);
//merger.channelInterpretation = 'discrete';
//merger.channelCountMode = 'explicit';
//merger.channelCount = 6;

var addOscilator = function(channel, frequency) {
    var oscillator = audioCtx.createOscillator();

    oscillator.frequency.value = frequency; // value in hertz
    oscillator.connect(merger,0,channel);
    oscillator.start();

    oscillators.push(oscillator);
};

addOscilator(0,300);
addOscilator(1,500);
addOscilator(2,700);
addOscilator(3,900);
addOscilator(4,1100);
addOscilator(5,1300);

merger.connect(audioCtx.destination);


Actual results:

Instead of outputting to the surround 6 channels the audio gets downmixed to stereo audio and outputted only on the left and right channel. 

When i do a console log of the audio context destination the maxChannelCount is 6 and the channelCount is also 6 but i still get only output on the left and right channel. these channels play all the output. (So its downmixed from 5.1 to stereo)

I also tried playing a 5.1 surround audiofile in a html-audio element in firefox and this worked fine. In other words, the browser is reconizing and able to output the surround set.


Expected results:

This example should output a different audio tone on every audio channel of the 5.1 surroundset (6 channels).