dancer.dart

A Dart package "dancer" is a high level audio library for HTML5 with a Flash fallback. It is implemented as a dancer.js wrapper.

version 0.4.0+4 (3/1/2014)

Features

• Use real-time audio waveform and frequency data and map it to any arbitrary visualization
• Use Dancer to get audio data from any preexisting audio source
• Leverage kick detection into your visualizations
• Simple API to time callbacks and events to any section of a song
• Supports Web Audio (webkit/mozilla), Audio Data (mozilla) and flash fallback (v9+)
• Extensible framework supporting plugins and custom behaviours

Live Examples

• Simple Player (source)
  Simple audio player with Play/Pause button.
• FFT (source)
  Realtime 'Fast Fourier Transform' visualizer.
• Waveform (source)
  Waveform analysis.
• Song Demo (source)
  Kick detection linked with 3D visual effects by three.js .

API Document

• http://htmlpreview.github.com/?http://github.com/hyamamoto/dancer.dart/blob/master/docs/dancer.html

Code Example

  final Dancer dancer = new Dancer();

  // Setup a kick detection.
  int kickCount = 0;
  final Kick kick = dancer.createKick(new KickOptions()
    ..decay = 0.02
    ..threshold = 0.3
    ..onKick = (num mag) { print( 'Kick[$kickCount]: mag = $mag'); kickCount++; }
    ..offKick = null
  ).on();

  // Schedule time based functions.
  dancer.onceAt( 1, () {
    print("Scheduled Func: 1 sec");
  }).between( 1.5, 2.0, () {
    print("Scheduled Func: 1.5 sec - 2.0 sec");
  }).onceAt( 2.5, (){
    final num freq = dancer.getFrequency( 400);
    print("Scheduled Func: 2.5 sec: $freq");
  }).after( 4, () {
    final num time = dancer.getTime();
    print("Scheduled Func: 4 sec +: $time");
    //kick.off();
  });

  // Load up an audio file 'tonetext.ogg'
  dancer.load({ "src": "../songs/tonetest", "codecs": [ "ogg"]});

  ...
  ...
  ...

  // Start playing  
  dancer.play();

Dependencies

• dancer.js - a backend javascript implementation (included inside a 'packages/dancer' directory).

Change Logs

** 0.4.0+4 (3/1/2014) **

• Dependency fix (newly released 'browser =0.10.0' is still buggy.)
• Updated all examples.

** 0.4.0 (2/28/2014)**

• Complete wrapper of dancer.js v0.4.0.

License

dancer.dart is released under the the MIT license by Hiroshi Yamamoto higon@freepress.jp