Function

Calculate FFT - Based on https://github.com/corbanbrook/dsp.js

Get the largest absolute value in an array

Example:

console.log(max([-3, 2, 1]), max([-3, 2, 4])); // logs 3 4

Test:

• util: absMax returns largest absolute number in the provided array when largest is positive
• util: absMax returns largest absolute number in the provided array when largest is negative
• util: absMax returns -Infinity for an empty array

Returns a number limited to the given range.

Load a file using fetch.

Example:

// default options
let options = {
    url: undefined,
    method: 'GET',
    mode: 'cors',
    credentials: 'same-origin',
    cache: 'default',
    responseType: 'json',
    requestHeaders: [],
    redirect: 'follow',
    referrer: 'client'
};

// override some options
options.url = '../media/demo.wav';

// available types: 'arraybuffer', 'blob', 'json' or 'text'
options.responseType = 'arraybuffer';

// make fetch call
let request = util.fetchFile(options);

// listen for events
request.on('progress', e => {
    console.log('progress', e);
});

request.on('success', data => {
    console.log('success!', data);
});

request.on('error', e => {
    console.warn('fetchFile error: ', e);
});

Create a function which will be called at the next requestAnimationFrame cycle

Get a random prefixed ID

Example:

console.log(getId()); // logs 'wavesurfer_b5pors4ru6g'

let prefix = 'foo-';
console.log(getId(prefix)); // logs 'foo-b5pors4ru6g'

Test:

• util: getId returns a random string with a default prefix
• util: getId returns a random string with a custom prefix

Ignores device silence mode when using the WebAudio backend.

Many mobile devices contain a hardware button to mute the ringtone for incoming calls and messages. Unfortunately, on some platforms like iOS, this also mutes wavesurfer's audio when using the WebAudio backend. This function creates a temporary <audio> element that makes sure the WebAudio backend keeps playing when muting the device ringer.

Get the largest value

Example:

console.log(max([1, 2, 3])); // logs 3

Test:

• util: max returns the largest number in the provided array
• util: max returns -Infinity for an empty array

Get the smallest value

Example:

console.log(min([1, 2, 3])); // logs 1

Test:

• util: min returns the smallest number in the provided array
• util: min returns +Infinity for an empty array

Starts listening for click event and prevent propagation

Apply a map of styles to an element

Returns an appropriately oriented object based on vertical. If vertical is true, attribute getting and setting will be mapped through verticalPropMap, so that e.g. getting the object's .width will give its .height instead. Certain methods of an oriented object will return oriented objects as well. Oriented objects can't be added to the DOM directly since they are Proxy objects and thus fail typechecks. Use domElement to get the actual element for this.