The allocationSize() method of the AudioData interface returns the size in bytes required to hold the current sample as filtered by options passed into the method.

options

An object containing the following:

planeIndex

The index of the plane to return the size of.

frameOffset Optional

An integer giving an offset into the plane data indicating which plane to begin from. Defaults to 0.

frameCount Optional

An integer giving the number of frames to return the size of. If omitted then all frames in the plane will be used, beginning with the frame specified in frameOffset.

An integer containing the number of bytes needed to hold the samples described by options.

The following example gets the size of the plane at index 1.

let size = AudioData.allocationSize({ planeIndex: 1 });