Click Tracks for your JavaScript

A light-weight utility for emitting events that are in-time with music.

Description

The main export is a constructor that can be called with differently based on use-case. Some examples are:

• Emit events for every beat timed with an audio/video source
• Emit events for every beat with out a source
• Emit events at defined cues, like music notation

Install

npm i click-track

Usage

Basic timer running at 120 bpm

  const track = new ClickTrack({
    tempo: 120,
    autostart: true,
  });

  track.on('beat', (e) => {
    console.log(e.beat);
  });

  // Outputs 1, 2, 3, 4.... at 120 bpm

Basic timer running at 60 bpm

  const track = new ClickTrack({
    autostart: true,
    // Tempo defaults to 60
  });

  track.on('beat', (e) => {
    console.log(e.beat);
  });

  // Outputs 1, 2, 3, 4.... at 60 bpm

Basic cues When the default tempo is 60, the cues are synonymous with seconds

  const track = new ClickTrack({
    cues: [1, 3, 5, 7],
    autostart: true,
  }});

  track.on('cue', (e) => {
    console.log(e.beat);
  });

  // Outputs 1, 2, 3, 4 at 1 second, 3 seconds, 5 seconds, and then 7 seconds

Basic cues with tempo

  const track = new ClickTrack({
    cues: [1, 3, 5, 7],
    tempo: 120,
    autostart: true,
  }});

  track.on('cue', (e) => {
    console.log(e.beat);
  });

  // Outputs 1, 2, 3, 4 at 0.5 second (beat 1), 1.5 seconds (beat 3), 2.5 seconds (beat 5), and then 3.5 seconds (beat 7)

Basic cues with data To pass data with each cue, use tuples for each cue.

  const track = new ClickTrack({
    cues: [[1, "A"], [3, "B"], [5, "C"], [7, "D"]],
    tempo: 120,
    autostart: true,
  }});

  track.on('cue', (e) => {
    console.log(e.data);
  });

  // Outputs "A", "B", "C", "D" at 0.5 second (beat 1), 1.5 seconds (beat 3), 2.5 seconds (beat 5), and then 3.5 seconds (beat 7)

TODO

• Upgrade typescript dep
• Slave/master tracks to sync timers or media
• Implement events for start/stop/repeat click track
• Tests
• Include source maps in dist
• Add calibration loop (begin anticipating the delay in code execution)
• Publish code examples
  • Metronome
  • Rhythm game
  • YouTube video
  • Cues for tweening
  • Cues without tempo (ie 60bpm)
  • Basic cue mapping tool
• Tempo maps for varying tempos
• Readme documentation
• Remove dependencies (rxjs)
• Implement event triggers for beats and bars
• Parameter for track offset
• Add built-in ticker
• Add support for custom ticker
• Option to sync with html5 audio or video
• Option to sync with youtube iframe player
• Cue tracks
• Include minified/targeted build
• Handle @TODO's