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:bell: Catch realtime audio wave from microphone with JavaScript!

License: MIT License

JavaScript 52.77% HTML 1.80% CoffeeScript 45.43%

javascript microphone audio visualization waveform oscilloscope webaudio-api webtechnology

wavebell's Introduction

wavebell

Catch realtime audio wave from microphone with JavaScript!

Screenshot

Installation

# Install with npm
npm install --save wavebell
# Install with yarn
yarn add wavebell

Example

var bell = new WaveBell();

bell.on('wave', function (e) {
  // draw oscilloscope
  drawColumn(e.value);
});

bell.on('stop', function () {
  var blob = bell.result;
  // play recorded audio
  playback(URL.createObjectURL(blob));
});

// 25 frames per second
bell.start(1000 / 25);

Notice

In Chrome 47 or above, getUserMedia requires HTTPS to work. So it'd be better to setup SSL for your server.

Thanks

Mozilla web docs visualizations with web audio API
Jos Dirksen for his great blog post about audio visualization

License

The MIT License.

wavebell's People

Contributors

Stargazers

Watchers

Forkers

carloslema david-carty lawtr chbrown magicianred kylebeloin

wavebell's Issues

Amplify audio and audio filtering

Hello,
Is there a way to amplify the audio and to filter some frequencies using this code?
Thanks!

Catching blocked audio

Is there a way to catch a situation, when audio device is not accessible due to user block?
Tried .on('error',...), .on('err',...) and try { bell.start() } catch (...) {...}, but none of them seems to work.

I'm trying to work with that in React, so error could be kind of confusing.

Oh, I see, that you don't catch that (recorder.js:52).

Draw wave just like wavesurfer-js

Hello,

Thanks for your awesome work,

Is there a way to draw the wave to be the same as wavesurfer-js?

Thanks in advance.

Canvas does not show on iOS 12

Hi, thank you for sharing this!
I've experimented with your implementation on mobile devices. Android (Chrome) works fine, but the canvas does not render on the latest iOS version. Did you notice this as well?

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