Web Audio boilerplate

A couple of helpers necessary for cross-browser web audio projects.

note : in addition of this library, I recommend using @cwilso's AudioContext-MonkeyPatch for normalizing Web Audio API across browsers (prefix and method names). For convenience, it is already bound with the built version of the library.

Download

• From npm : npm install --save web-audio-boilerplate
• Built version (bundled with AudioContext-MonkeyPatch) : here

API

webAudioBoilerplate.getSupportedFormats(audioContext, done)

Test what audio formats are supported in the current browser. Calls done(err, results) where result is an object :

{
  wav: <trueOrFalse>,     // Equivalent to s16le
  ogg: <trueOrFalse>, 
  mp3: <trueOrFalse>, 
  aac: <trueOrFalse>, 
  flac: <trueOrFalse>, 
  s16le: <trueOrFalse>,   // wav PCM signed 16-bit little-endian
  s24le: <trueOrFalse>,   // wav PCM signed 24-bit little-endian
  f32le: <trueOrFalse>,   // wav PCM 32-bit floating-point little-endian
  u8: <trueOrFalse>       // wav PCM unsigned 8-bit
}

webAudioBoilerplate.getAudioContextOnClick(elem, handler)

iOS requires a user action in order for your AudioContext to make any sound. When the HTML elem is clicked or tapped, handler(err, audioContext) is called with audioContext an unmuted instance of AudioContext. This function is only really necessary on iOS, but you can use it safely in all browsers.

Demo

There is a simple demo here. You can see the demo in action here.