A multi channel WebAudio analyzer that does all the nasty plumbing with JavaScriptSourceNodes and AnalyzerNodes for you.

Analyze the input stream from your computer's microphone and log results to the console:

var Analyzer = require('analyzer');
var AudioContext = window.audioContext || window.webkitAudioContext;
var context = new AudioContext();
var analyzer = Analyzer(context)
  .add('left', source, 0)
  .add('right', source, 1);
analyzer.on('float frequency data', function(chunk) {
  console.log('float frequency data', chunk);
  // { left: [ ... ], right: [ ... ] }
});

Install with component(1):

$ component install juliangruber/analyzer

Create a new Analyzer for the WebAudio context. Inherits from component/emitter.

Possible options:

• smoothing: The smoothing time constant, can be between 0 and 1.

Start analyzing node and expose it in events under name. channel is the output channel you care about and defaults to 0.

Resume analyzing.

Pause analyzing.

Call fn with a Float32Array(fftSize / 2) for each new chunk.

Call fn with a Uint8Array(fftSize / 2) for each new chunk.

Call fn with a Float32Array(fftSize) for each new chunk.

MIT