# wavesurfer.js + Microphone

#### wavesurfer.js Microphone Plugin

Visualizes audio input from a microphone in wavesurfer.js instances.

#### Installation

1. add the Microphone plugin script tag
2. create a `WaveSurfer` instance
3. create a `Microphone` instance
4. control the Microphone using the `start`, `stopDevice`, `play`, `pause`, `stop` and `togglePlay` methods

Download the plugin (3.2 KB)

#### Quick Start

    var wavesurfer = Object.create(WaveSurfer);

    wavesurfer.init({
      container     : '#waveform',
      waveColor     : 'black',
      interact      : false,
      cursorWidth   : 0
    });

    var microphone = Object.create(WaveSurfer.Microphone);

    microphone.init({
        wavesurfer: wavesurfer
    });

    microphone.on('deviceReady', function(stream) {
        console.log('Device ready!', stream);
    });
    microphone.on('deviceError', function(code) {
        console.warn('Device error: ' + code);
    });

    // start the microphone
    microphone.start();

    // pause rendering
    //microphone.pause();

    // resume rendering
    //microphone.play();

    // stop visualization and disconnect microphone
    //microphone.stopDevice();

    // same as stopDevice() but also clears the wavesurfer canvas
    //microphone.stop();

    // destroy the plugin
    //microphone.destroy();

#### Options

Name | Required | Default | Description
--- | --- | --- | ---
`wavesurfer` | yes |  | A WaveSurfer instance.
`bufferSize` | no | 4096 | The buffer size in units of sample-frames. If specified, the `bufferSize` must be one of the following values: 256, 512, 1024, 2048, 4096, 8192, 16384.
`numberOfInputChannels` | no | 1 | Integer specifying the number of channels for this node's input. Values of up to 32 are supported.
`numberOfOutputChannels` | no | 1 | Integer specifying the number of channels for this node's output. Values of up to 32 are supported.

#### Events

Name | Description
--- | ---
`deviceReady` | Invoked when the device is ready to use. Callback will receive a `LocalMediaStream` object that contains the microphone stream.
`deviceError` | Invoked when the user doesn't allow the browser to access the microphone. Callback will receive a (string) error code.

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