The code is then split between 4 important functions: PauseButton.addEventListener("click", pauseRecording) StopButton.addEventListener("click", stopRecording) RecordButton.addEventListener("click", startRecording) Var pauseButton = document.getElementById("pauseButton") Var stopButton = document.getElementById("stopButton") Var recordButton = document.getElementById("recordButton") Var AudioContext = window.AudioContext || window.webkitAudioContext shim for AudioContext when it's not avb. MediaStreamAudioSourceNode we'll be recording Moving on to app.js we start by setting up a few variables, shims, getting references to our UI elements and adding event listeners: //webkitURL is deprecated but nevertheless Simple Recorder.js demo with record, stop and pause Our index.html file is pretty straightforward: we’ll load recorder.js through Rawgit’s production URL.
Our simple demo will have the following files: To get you started with Recorder.js we’ll build a simple demo that allows you to record a voice message in the browser but also pause & resume the recording process. You’ll most commonly see 44.1 kHz and 48kHz audio recordings.ĭespite what’s written in some tutorials I found, Recorder.js does not support mp3 encoding, only wav. Recorder.js will record 16bit mono/2 channel audio at the sample rate is set in your OS for your playback device ( as per the spec). wav data so it is not blocking the browser tab or making it unresponsive. Recorder.js is smart in that uses a Web Worker to put together the. Its only 12.7KB (non minified) and 3.2KB when gzipped, you’re spending only 1 HTTP call, and you can load it directly from the Rawgit CDN for production. Nevertheless, if you’re looking to record mono or 2 channel uncompressed pcm audio Recorder.js is still a great choice. That’s also in part because newer libraries, like Web Audio Recorder, vmsg and opus-recorder, although a lot bigger, can also convert the audio to mp3, Opus or Vorbis. This repository is not being actively maintained due to lack of time and interest. In July 2016 Matt updated the repository to say that: When used in conjunction with getUserMedia() Recorder.js can record audio from a user’s microphone (or other input devices) directly in your web site.ĭespite its popularity – the project has 2700+ stars on GitHub – the library is not maintained anymore. It is the 1st JS library to deal with audio recording in the browser – the initial commit is from September 2012, almost 6 years ago. Matt Diamond‘s Recorder.js is a popular JavaScript library for recording audio in the browser as uncompressed pcm audio in. Next, we’ll cover using WebAudioRecorder, vmsg, the opus-recorder and MediaRecording API. This is the 1st post in our new recording audio in HTML5 series.
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