AudioNode: channelInterpretation property
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The channelInterpretation property of the AudioNode interface represents an enumerated value describing how input channels are mapped to output channels when the number of inputs/outputs is different. For example, this setting defines how a mono input will be up-mixed to a stereo or 5.1 channel output, or how a quad channel input will be down-mixed to a stereo or mono output.
The property has two options: speakers and discrete. These are documented in Basic concepts behind Web Audio API > up-mixing and down-mixing.
Value
The values are documented in Basic concepts behind Web Audio API > up-mixing and down-mixing.
In summary:
speakers-
Use set of "standard" mappings for combinations of common speaker input and outputs setups (mono, stereo, quad, 5.1). For example, with this setting a mono channel input will output to both channels of a stereo output.
discrete-
Input channels are mapped to output channels in order. If there are more inputs that outputs the additional inputs are dropped; if there are fewer than the unused outputs are silent.
Examples
const audioCtx = new AudioContext();
const oscillator = audioCtx.createOscillator();
const gainNode = audioCtx.createGain();
oscillator.connect(gainNode);
gainNode.connect(audioCtx.destination);
oscillator.channelInterpretation = "discrete";
Specifications
| Specification |
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| Web Audio API # dom-audionode-channelinterpretation |
Browser compatibility
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channelInterpretation
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