wav-spectrogram v0.0.4

wav-spectrogram

A Node.js library for loading WAV files and drawing a spectrogram to a canvas.

Usage

Load WAV file using a input object, read contents as an array buffer and pass to function with a canvas of the desired dimensions:

var wavSpectro = require('wav-spectrogram');

var fileInput = document.getElementById('file-input');
var canvasElem = document.getElementById('spectrogram-canvas');

var reader = new FileReader();

reader.onload = function() {

    var arrayBuffer = reader.result;

    wavSpectro.drawSpectrogram({arrayBuffer: arrayBuffer, canvasElem: canvasElem, cmap: 'jet'}, function () {
    
        console.log("Done.");
    
    });

};

reader.readAsArrayBuffer(fileInput.files[0]);

Functions

The draw function must be handed parameters in an object, named as such. Parameters with default values can be left out.

As well as the params object, the draw function accepts a callback function.