index.md

---

title: AudioBuffer.copyToChannel()
slug: Web/API/AudioBuffer/copyToChannel
page-type: web-api-instance-method
browser-compat: api.AudioBuffer.copyToChannel

---

{{ APIRef("Web Audio API") }}

The copyToChannel() method of the {{ domxref("AudioBuffer") }} interface copies the samples to the specified channel of the AudioBuffer, from the source array.

Syntax

copyToChannel(source, channelNumber)
copyToChannel(source, channelNumber, startInChannel)

Parameters

• source

  • : A {{jsxref("Float32Array")}} that the channel data will be copied from.

• channelNumber

  • : The channel number of the current {{domxref("AudioBuffer")}} to copy the channel data to. If channelNumber is greater than or equal to {{domxref("AudioBuffer.numberOfChannels")}}, an INDEX_SIZE_ERR will be thrown.

• startInChannel {{optional_inline}}

  • : An optional offset to copy the data to. If startInChannel is greater than {{domxref("AudioBuffer.length")}}, an INDEX_SIZE_ERR will be thrown.

Return value

None ({{jsxref("undefined")}}).

Examples

const myArrayBuffer = audioCtx.createBuffer(2, frameCount, audioCtx.sampleRate);
const anotherArray = new Float32Array();
// Copy channel data from second channel of myArrayBuffer.
myArrayBuffer.copyFromChannel(anotherArray, 1, 0);
// Copy data from anotherArray to first channel of myArrayBuffer. Both channels have the same data now.
myArrayBuffer.copyToChannel(anotherArray, 0, 0);

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• Using the Web Audio API