Detect Supported Audio Formats with JavaScript

By  on  

As streaming becomes our main entertainment source and vendors fight to create the best video format, it's going to be more and more important that we detect device and browser video support before posting videos on our websites.  We think less about audio but the same principle applies:  detect whether or not a given audio format is supported before using it.  So how do we detect if a given audio type is supported?

We can detect audio format support with HTMLAudioElement.prototype.canPlayType, the same strategy that's used with video:

// Create an audio element so we can use the canPlayType method
const audio = document.createElement('audio');

// Does the device support mp3?
audio.canPlayType('audio/mpeg'); // "probably"

There are three possible results from canPlayType:

  • "probably" : The media type appears to be playable
  • "maybe": Cannot tell if the media type is playable without playing it
  • "": The media type is not playable

We can create a function much like my supportsVideoType function to make audio detection easy:

function supportsAudioType(type) {
  let audio;

  // Allow user to create shortcuts, i.e. just "mp3"
  let formats = {
    mp3: 'audio/mpeg',
    mp4: 'audio/mp4',
    aif: 'audio/x-aiff'
  };

  if(!audio) {
    audio = document.createElement('audio')
  }

  return audio.canPlayType(formats[type] || type);
}

// Usage
if(supportsVideoType('mp3') === "probably") {
  // Set the video to mp3
}
else {
  // Set the video to wav or other format
}

Taking the time to detect edge audio and video formats is well worth it, allowing you to deliver clearer media with better compression to improve load time.  Keep these JavaScript functions in mind for your large or small media site!

Recent Features

Incredible Demos

  • By
    pointer Media Query

    As more devices emerge and differences in device interaction are implemented, the more important good CSS code will become.  In order to write good CSS, we need some indicator about device capabilities.  We've used CSS media queries thus far, with checks for max-width and pixel ratios.

  • By
    MooTools History Plugin

    One of the reasons I love AJAX technology so much is because it allows us to avoid unnecessary page loads.  Why download the header, footer, and other static data multiple times if that specific data never changes?  It's a waste of time, processing, and bandwidth.  Unfortunately...

Discussion

  1. Sam Dutton

    Nice article!

    For what it’s worth, I have a demo of

    canPlayType()

    at simpl.info/cpt.

Wrap your code in <pre class="{language}"></pre> tags, link to a GitHub gist, JSFiddle fiddle, or CodePen pen to embed!