Web Audio API: How do I play a mono source in only left or right channel?

Question

Is there an (easy) way to take a mono input and play it only in the left or right channel? I'm thinking I can do it through the ScriptProcessing node, but if there is a node meant to handle this situation I'd really like to know. The API has a section on mixing, but I don't see any code on how to manipulate channels yourself in this fashion.

Note, I have tried the panner node, but it doesn't seem to really cut off the left the from the right channel, I don't want any sound bleeding from one channel to the other.

Community · Accepted Answer · 2017-05-23 11:44:24Z

3

You do want to use the ChannelSplitter, although there is a bug when a channel is simply not connected. See this issue: Play an Oscillation In a Single Channel.

edited May 23, 2017 at 11:44

CommunityBot

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answered Jan 31, 2013 at 21:46

cwilso

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janesconference · Accepted Answer · 2013-01-31 15:37:12Z

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Take a look at the splitter node: https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html#ChannelSplitterNode-section

One application for ChannelSplitterNode is for doing "matrix mixing" where individual gain control of each channel is desired.

(I haven't yet tried it, let me know : )

answered Jan 31, 2013 at 15:37

janesconference

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Ben Hocking · Accepted Answer · 2015-08-13 16:50:48Z

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You can try to use the CreatePanner() and then setPosition() to the desired channel. Don't forget to connect your previous node to the panner node and the panner to the context.destination.

For example:

//Lets create a simple oscilator just to have some audio in our context
var oscillator = context.createOscillator();

//Now lets create the panner node
var pannerNode = context.createPanner();

//Connecting the nodes
oscillator.connect(pannerNode); //Connecting the oscillator output to the panner input
pannerNode.connect(context.destination); //Connecting the panner output to our sound output

//Setting the position of the sound
pannerNode.setPosition(-1, 0, 0);//If you want it to play on the left channel
pannerNode.setPosition(1, 0, 0);//If you want it to play on the right channel

//Playing the sound
oscillator.noteOn(0);

Is that what you need?

edited Aug 13, 2015 at 16:50

Ben Hocking

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answered Sep 4, 2013 at 2:58

Oliver Drummond

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1 Comment

Bill Woodger Over a year ago

Someone has suggested and edit. Can you review, it looks to have missed a typo at least.

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