IAudioChunk

3.6.6

Properties

ChannelConfig	number
ChannelCount	number
Data	VBArray	You need to use toArray() on this before using.
SampleCount	number
SampleRate	number

Note

You must check the return value from fb.GetAudioChunk is valid before using.

// offset is optional, defaults to zero
var chunk = fb.GetAudioChunk(requested_length, offset);

if (chunk) {
    // chunk now has the following properties
    // chunk.ChannelConfig
    // chunk.ChannelCount
    // chunk.SampleRate
    // chunk.SampleCount
    // chunk.Data

    var data = chunk.Data.toArray();

    var channel_count = chunk.ChannelCount;
    for (var i = 0; i < data.length; i += channel_count) {
        // assuming stereo
        var l = data[i];
        var r = data[i + 1];
    }
}

IAudioChunk is a simplified wrapper around this:

https://github.com/marc2k3/foobar2000-sdk/blob/main/foobar2000/SDK/audio_chunk.h

Component version 3.6.7 and later contain a VU Meter sample which shows how to use this.