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Web Audio Api destination maxChannelCount always is 2 on Linux

0

I have a problem with Web Audio API and an usb audio interface on Linux;

I wrote some audio player code on Web Audio API.

Everything is alright when I connect my 7.1 USB Audio Interface (TASCAM 16x08 - there are 8 output channels) and start my APP on Windows machine. context.destination.maxChannelCount equals 8 and I can select the channel to output the sound.

But when I do the same on Linux machine context.destination.maxChannelCount always is 2 (stereo).

I tried to:

• create virtual audio multichannel device = same result - always only 2 maxChannelCount;


• setting alsa, pulseaudio, jack audio connection kit and more...

The result is the same: in my code context.destination.maxChannelCount is always is 2
but the operating systems settings dialog detects 8 channels.

This is some code to be clear:

var context = new (window.AudioContext || window.webkitAudioContext)();
var audio = new Audio();
var source = context.createMediaElementSource(audio);
source.connect(context.destination);
audio.src = 'audio.mp3';
audio.play();

console.log(context.destination.maxChannelCount); //output on win: 2
 on linux: 8

What can be the problem?

linux electron html5-audio web-audio-api

share|improve this question

edited Mar 7 at 15:32

kalehmann

2,7331023

asked Mar 7 at 15:22

EvgenyEvgeny

1

add a comment | 

0

I have a problem with Web Audio API and an usb audio interface on Linux;

I wrote some audio player code on Web Audio API.

Everything is alright when I connect my 7.1 USB Audio Interface (TASCAM 16x08 - there are 8 output channels) and start my APP on Windows machine. context.destination.maxChannelCount equals 8 and I can select the channel to output the sound.

But when I do the same on Linux machine context.destination.maxChannelCount always is 2 (stereo).

I tried to:

• create virtual audio multichannel device = same result - always only 2 maxChannelCount;


• setting alsa, pulseaudio, jack audio connection kit and more...

The result is the same: in my code context.destination.maxChannelCount is always is 2
but the operating systems settings dialog detects 8 channels.

This is some code to be clear:

var context = new (window.AudioContext || window.webkitAudioContext)();
var audio = new Audio();
var source = context.createMediaElementSource(audio);
source.connect(context.destination);
audio.src = 'audio.mp3';
audio.play();

console.log(context.destination.maxChannelCount); //output on win: 2
 on linux: 8

What can be the problem?

linux electron html5-audio web-audio-api

share|improve this question

edited Mar 7 at 15:32

kalehmann

2,7331023

asked Mar 7 at 15:22

EvgenyEvgeny

1

add a comment | 

I have a problem with Web Audio API and an usb audio interface on Linux;

I wrote some audio player code on Web Audio API.

Everything is alright when I connect my 7.1 USB Audio Interface (TASCAM 16x08 - there are 8 output channels) and start my APP on Windows machine. context.destination.maxChannelCount equals 8 and I can select the channel to output the sound.

But when I do the same on Linux machine context.destination.maxChannelCount always is 2 (stereo).

I tried to:

• create virtual audio multichannel device = same result - always only 2 maxChannelCount;


• setting alsa, pulseaudio, jack audio connection kit and more...

The result is the same: in my code context.destination.maxChannelCount is always is 2
but the operating systems settings dialog detects 8 channels.

This is some code to be clear:

var context = new (window.AudioContext || window.webkitAudioContext)();
var audio = new Audio();
var source = context.createMediaElementSource(audio);
source.connect(context.destination);
audio.src = 'audio.mp3';
audio.play();

console.log(context.destination.maxChannelCount); //output on win: 2
 on linux: 8

What can be the problem?

linux electron html5-audio web-audio-api

share|improve this question

edited Mar 7 at 15:32

kalehmann

2,7331023

asked Mar 7 at 15:22

EvgenyEvgeny

1

var context = new (window.AudioContext || window.webkitAudioContext)();
var audio = new Audio();
var source = context.createMediaElementSource(audio);
source.connect(context.destination);
audio.src = 'audio.mp3';
audio.play();

console.log(context.destination.maxChannelCount); //output on win: 2
 on linux: 8

share|improve this question

edited Mar 7 at 15:32

kalehmann

2,7331023

asked Mar 7 at 15:22

EvgenyEvgeny

1

share|improve this question

edited Mar 7 at 15:32

kalehmann

2,7331023

asked Mar 7 at 15:22

EvgenyEvgeny

1

edited Mar 7 at 15:32

kalehmann

2,7331023

edited Mar 7 at 15:32

kalehmann

2,7331023

asked Mar 7 at 15:22

EvgenyEvgeny

1

asked Mar 7 at 15:22

EvgenyEvgeny

1

2 Answers
2

active

oldest

votes

0

What browser are you running? Browser is responsible for giving you those available outputs, if they're not there (in all available browsers) then i think you're out of luck. I have done some things with Web Audio and multiple outputs and even on the same OS i got different results from different browsers.

share|improve this answer

answered Mar 7 at 15:51

EindbaasEindbaas

369415

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I use electron js - my browser is Chromium. It`s looks like Chromium in linux can not detect device channel count and set it for 2 as default
  
  – Evgeny
  Mar 7 at 16:37
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Try and see what number of outputs you get in different browsers on linux. I assume you have that audio interface working correctly in linux? as in you have somewhere in the OS saying that you have 8 outputs available?
  
  – Eindbaas
  Mar 7 at 16:40
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It can be Chromium, but can also be something else. Does your OS say you have 8 outputs?
  
  – Eindbaas
  Mar 7 at 16:43
  

  
  
  
  

add a comment | 

0

I found solution here https://ubuntuforums.org/archive/index.php/t-1072792.html

solved it by editing /etc/pulse/daemon.conf.
; default-sample-channels
= 2 uncomment the line and add more channels.

share|improve this answer

answered Mar 8 at 8:31

EvgenyEvgeny

1

add a comment | 

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0

What browser are you running? Browser is responsible for giving you those available outputs, if they're not there (in all available browsers) then i think you're out of luck. I have done some things with Web Audio and multiple outputs and even on the same OS i got different results from different browsers.

share|improve this answer

answered Mar 7 at 15:51

EindbaasEindbaas

369415

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I use electron js - my browser is Chromium. It`s looks like Chromium in linux can not detect device channel count and set it for 2 as default
  
  – Evgeny
  Mar 7 at 16:37
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Try and see what number of outputs you get in different browsers on linux. I assume you have that audio interface working correctly in linux? as in you have somewhere in the OS saying that you have 8 outputs available?
  
  – Eindbaas
  Mar 7 at 16:40
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It can be Chromium, but can also be something else. Does your OS say you have 8 outputs?
  
  – Eindbaas
  Mar 7 at 16:43
  

  
  
  
  

add a comment | 

0

What browser are you running? Browser is responsible for giving you those available outputs, if they're not there (in all available browsers) then i think you're out of luck. I have done some things with Web Audio and multiple outputs and even on the same OS i got different results from different browsers.

share|improve this answer

answered Mar 7 at 15:51

EindbaasEindbaas

369415

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I use electron js - my browser is Chromium. It`s looks like Chromium in linux can not detect device channel count and set it for 2 as default
  
  – Evgeny
  Mar 7 at 16:37
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Try and see what number of outputs you get in different browsers on linux. I assume you have that audio interface working correctly in linux? as in you have somewhere in the OS saying that you have 8 outputs available?
  
  – Eindbaas
  Mar 7 at 16:40
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It can be Chromium, but can also be something else. Does your OS say you have 8 outputs?
  
  – Eindbaas
  Mar 7 at 16:43
  

  
  
  
  

add a comment | 

What browser are you running? Browser is responsible for giving you those available outputs, if they're not there (in all available browsers) then i think you're out of luck. I have done some things with Web Audio and multiple outputs and even on the same OS i got different results from different browsers.

share|improve this answer

answered Mar 7 at 15:51

EindbaasEindbaas

369415

share|improve this answer

answered Mar 7 at 15:51

EindbaasEindbaas

369415

answered Mar 7 at 15:51

EindbaasEindbaas

369415

answered Mar 7 at 15:51

EindbaasEindbaas

369415

0

I found solution here https://ubuntuforums.org/archive/index.php/t-1072792.html

solved it by editing /etc/pulse/daemon.conf.
; default-sample-channels
= 2 uncomment the line and add more channels.

share|improve this answer

answered Mar 8 at 8:31

EvgenyEvgeny

1

add a comment | 

0

I found solution here https://ubuntuforums.org/archive/index.php/t-1072792.html

solved it by editing /etc/pulse/daemon.conf.
; default-sample-channels
= 2 uncomment the line and add more channels.

share|improve this answer

answered Mar 8 at 8:31

EvgenyEvgeny

1

add a comment | 

I found solution here https://ubuntuforums.org/archive/index.php/t-1072792.html

solved it by editing /etc/pulse/daemon.conf.
; default-sample-channels
= 2 uncomment the line and add more channels.

share|improve this answer

answered Mar 8 at 8:31

EvgenyEvgeny

1

share|improve this answer

answered Mar 8 at 8:31

EvgenyEvgeny

1

answered Mar 8 at 8:31

EvgenyEvgeny

1

answered Mar 8 at 8:31

EvgenyEvgeny

1