Tutorial: HTML Audio Capture streaming to Node.js (no browser extensions)

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1 Tutorial: HTML Audio Capture streaming to Node.js (no browser extensions) by Gabriel Poça on Jun 24, 2014 DEVELOPMENT I'm taking the time to write the tutorial I wish I had some months ago. My task was to set up some user voice recording mechanism in the browser. It should record for about one hour, non-stop, saving to a server. The idea was to use the getusermedia() API. No browser extensions should be used. The getusermedia() API allows web apps to request access to a media device such as a camera or microphone. It yields raw PCM data. Round One We approached the task looking for the smallest change that solved the problem. We did it using RecordRTC. It records the microphone in the browser. When finished, we can upload it to a server through a normal request. Let me show you how it works. Add the RecordRTC library. <script src="// Experiment.com/RecordRTC.js"></script> tutorial html audio capture streaming to node js no browser extensions 1/17

2 Request access to the microphone. var session = { audio: true, video: false }; var recordrtc = null; navigator.getusermedia(session, function (mediastream) { recordrtc = RecordRTC(MediaStream); recordrtc.startrecording(); }, onerror); When finished recording, stop and upload to a server. recordrtc.stoprecording(function(audiourl) { var formdata = new FormData(); formdata.append('edition[audio]', recordrtc.getblob()) $.ajax({ type: 'POST', url: 'some/path', data: formdata, contenttype: false, cache: false, processdata: false, }) }); The code works, but you shouldn't write code like this, it's just an example. Drawbacks Audio is recorded in wav format. An one hour recording, with one channel, can take tutorial html audio capture streaming to node js no browser extensions 2/17

3 around 500mb. This is a problem for the browser limited memory. Also the upload would take ages! It wasn't working. Round Two After reading the source code from RecordRTC (ugly) and RecorderJS, I realised that using a ScriptProcessorNode I can write JavaScript to send data chunks (audio samples) from the microphone to a server. Turns out it's harder than it seems, mostly because of the lack of information. There are a couple of related Stack Overflow answers (I will add them in the end), but I won't bother you with this. Let's move on to the code. Reading data from the microphone First request microphone access. var session = { audio: true, video: false }; var recordrtc = null; navigator.getusermedia(session, initializerecorder, onerror); Having the microphone stream you can use the AudioContext interface to make the audio (PCM data) go through different processing nodes before reaching its destination. There are nodes for gain, compressor, panner, and much more. We are going to write a custom node, so we can access the audio samples. For that we add a ScriptProcessorNode. tutorial html audio capture streaming to node js no browser extensions 3/17

4 function initializerecorder(stream) { var audiocontext = window.audiocontext; var context = new audiocontext(); var audioinput = context.createmediastreamsource(stream); var buffersize = 2048; // create a javascript node var recorder = context.createjavascriptnode(buffersize, 1, 1); // specify the processing function recorder.onaudioprocess = recorderprocess; // connect stream to our recorder audioinput.connect(recorder); // connect our recorder to the previous destination recorder.connect(context.destination); } After this, every audio sample will go through the recorderprocess function. function recorderprocess(e) { } var left = e.inputbuffer.getchanneldata(0); We have now PCM data samples from the left channel. Since we are recording in mono we only need the left channel. Now moving on to streaming these chunks to the server. Communication We are using WebSockets to send the samples to the server. The server is going to be written in Node.js. I started with Socket.IO. When things didn't work I realised Socket.IO doesn't support binary communication (in fact, it does now, I made this before it did). BinaryJS does support binary communication, so I moved to it. tutorial html audio capture streaming to node js no browser extensions 4/17

5 Setup BinaryJS First add the BinaryJS library. <script src=" Now start a connection. var client = new BinaryClient('ws://localhost:9001'); When ready, create a write stream. client.on('open', function() { // for the sake of this example let's put the stream in the window window.stream = client.createstream(); } Going back to our custom node let's send the audio to the stream. function recorderprocess(e) { var left = e.inputbuffer.getchanneldata(0); window.stream.write(left); } tutorial html audio capture streaming to node js no browser extensions 5/17

6 Everything should be ready on the client side now. Our recorderprocess function is called for each audio chunk, and each is sent to the server. But we aren't ready yet! There is one important step missing. WebAudio samples are in Float32. If you choose to send them like this you need to know that endianness does matter. I chose to convert them to 16 bit signed integers: function convertfloat32toint16(buffer) { l = buffer.length; buf = new Int16Array(l); while (l ) { buf[l] = Math.min(1, buffer[l])*0x7fff; } return buf.buffer; } function recorderprocess(e) { var left = e.inputbuffer.getchanneldata(0); window.stream.write(convertfloat32toint16(left)); } We are now done with the client code. Moving on to the server. Setting up a server I'm not getting into much detail on the server, I'm just going to show how to put these chunks in a playable media file. I'm assuming you already have Node.js installed. We need BinaryJS, and node-wav on the server. The first is for communication, and the second accepts raw audio data and outputs a WAV file with a valid WAVE header. tutorial html audio capture streaming to node js no browser extensions 6/17

7 npm init npm install binaryjs npm install wav Now create the index.js file and start the BinaryJS server. var binaryserver = require('binaryjs').binaryserver; var wav = require('wav'); var server = binaryserver({port: 9001}); server.on('connection', function(client) { });... Inside the server.on('connection', function) callback node-wav is going to help pipe the stream into a file. var filewriter = null; client.on('stream', function(stream, meta) { var filewriter = new wav.filewriter('demo.wav', { channels: 1, samplerate: 48000, bitdepth: 16 }); stream.pipe(filewriter); stream.on('end', function() { filewriter.end(); }); }); tutorial html audio capture streaming to node js no browser extensions 7/17

8 client.on('close', function() { if (filewriter!= null) { filewriter.end(); } }); For a better understanding you should read node-wav document. In fact, you should read the source code since there isn't much documentation. Simply put, wav.filewriter accepts a pcm stream and sends it to a media file, setting the right header for the file. Notice the settings for wav.filewriter are hardcoded, but they can be sent through the stream. Parameters like sample rate change for each client. Setup complete You are ready to start recording. There is still a long way to go from here. You should probably support restoring the connection if it goes down, and append the audio to the same media. Wrap it up You can now start from here and build your own platform with audio recording. Maybe a personal note-taking platform. This solution allows you to record the microphone while not worrying about upload time and audio loss. The full source code is here. Feel free to leave any questions and comments. StackOverflow related answers Sound card detection for web tutorial html audio capture streaming to node js no browser extensions 8/17

9 Playing PCM stream from Web Audio API on Node.js Stream recorded audio from browser to server ABOUT GABRIEL POÇA There is no time for introductions, but if there was, you would instantly understand that this guy is a developer and he loves every aspect of it. Read more from Gabriel Offline Web Apps with Meteor In this blog post I'm presenting a solution to make Meteor apps work completely offline. In fact, Meteor apps already work offline,... DEVELOPMENT Read a related post tutorial html audio capture streaming to node js no browser extensions 9/17

10 Perfecting a CSS 3D animation With recent advances in front end technologies, front end developers have been going crazy, pushing CSS to its limits and doing all sorts... DEVELOPMENT Like what you've read so far? Let's work together. Your address GET WEEKLY UPDATES 30 Comments Subvisual Blog 1 Login Recommend Share Sort by Best Join the discussion tutorial html audio capture streaming to node js no browser extensions 10/17

11 vishal 10 months ago Hello Gabriel, Thank you this amazing tutorial. I am trying to stream audio i am paying with audio api to server. My goal is to mix audio on client side and send it to server to broadcast it. I have tried to update your code for this but it's not working. I have attached screenshot of my code too. Please look at it and suggest me what i should do? Thank you. 1 mjgraves 2 years ago I note that there are Stack Overflow references to people using other JS libraries to encode the PCM stream locally before sending it to the server. Opus would be a good choice that would save tons of bandwidth while retaining audio quality. 1 Gabriel Poça > mjgraves 2 years ago Hi, thank you, I'll have a look into it. 1 Chinmay > Gabriel Poça 2 years ago There is also a JS implementation of Mumble, but I don't think it does any client side encoding. Manmeet Kaur 5 months ago Great Post! HTML5 tutorial with simple and easy examples, Covering HTML5 Introduction, Attributes,Canvas,SVG,Multimedia,Video,Audio,Plug ins,youtube Videos, Geolocation, Drag and Drop, Local Storage, Coding Conventions / Style Guide. HTML5 Tutorial & CSS3 Tutorial. Ali Kidwai 8 months ago Hey Gabriel, I am implementing this in a project of mine but the file that gets recorded sounds very different from the actual sound. Do you know what might be causing that? Thanks for the help! Wang Jiang Yang 10 months ago Hi Gabriel~ Thank you for your amazing tutorial~ I've tried the code you're sharing on the Github! And it drives me crazy really > tutorial html audio capture streaming to node js no browser extensions 11/17

12 I've tried the code you're sharing on the Github! And it drives me crazy really > _<)b but I got a really strange problem... I want to let Android Chrome link to the node.js server and can do some clientside recording with the app.js code you've shared, but when I use the Windows OS as my node.js server runtime, it works fine and my Chrome Android can pop up a notification for allowing to open the microphone service and can do the recording, so do Chrome PC and Mac. But... when I change the node.js server runtime to Mac OSX and execute the app.js, the Chrome PC & Mac works fine except the Chrome Android(can't open the microphone service...). Is there any idea or instruction could solve this strange problem?! thanks first :) Wang Jiang Yang > Wang Jiang Yang 10 months ago After a few testing, I found that I forgot to set the right IP for binary server and had some code errors on node server, and it's all works find now. Very very thanks for this nice tutorial. I learned a lot! Cardoso a year ago Olá eu queria começar uma gravação, fazer stop e quando começar outra, ela ficar guardada nm novo ficheiro. Como poderei faze lo? Realtebo ᵛᵉʳᶦᶠᶦᵉᵈ a year ago how mich delay there is beetween input sound on a client and output on another client? Gunjan a year ago Using above code server run but when try to load page htpp://localhost:3700 than gives below error. Any IDEA why? nts.js:68 throw arguments[1]; // Unhandled 'error' event ^ or: Received unparsable message: TypeError: Property 'unpack' of object # <object> is not a function at E:\gunjan\StreamMaster\node_modules\binaryjs\lib\client.js:100:37 at process.startup.processnexttick.process._tickcallback (node.js:244:9) client.js line 100 : data = data.data; try { tutorial html audio capture streaming to node js no browser extensions 12/17

13 try { data = util.unpack(data); } catch (ex) { return self.emit('error', new Error('Received unparsable message: ' + ex)); //// 100th line } magnus a year ago Do you know if there is any way to implement the server side in Java? I have been browsing around for an answer but I can't seem to find one. My project won't allow me to have a nodejs server, as I have other code in java where I generate video that needs to be streamed to a client. I have been looking at a socket.io implementation in Java, but that doesnt seem to support binary messages. Any help would be extremely appreciated! Thanks! gabrielpoca > magnus a year ago Hi, I'm afraid I can't help you a lot, I'm not experienced with Java. But I made a quick search in google and found this ( and in the readme says it supports binary communication. You should try it. If socket.io doesn't work you can always use a more low level webscokets library for Java, socket.io is just a wrapper for websockets, you should be able to do it. Tomo Senri a year ago Hello, thank you very much for your tutorial. I want to send only human voice (speech) to node js server. Is there any way to detect voice? Thank you. Alexander Grau a year ago HTML audio is nice I could implement a real oscilloscope with this, maybe you like it... Aree Chaudhary a year ago i want to use YouTube api for video downloading because YouTube is block in Pakistan can anyone help me.? peace4all a year ago tutorial html audio capture streaming to node js no browser extensions 13/17

14 peace4all a year ago can we stream recorded audio in realtime without stopping the recording? Gabriel Poça > peace4all a year ago Hi, I'm sorry but I think I don't understand the question. You can use webrtc (audio and video) while recording, if that's what you're asking. peace4all > Gabriel Poça a year ago thnx 4 reply, but my problem is i want to record audio using webrtc,encode it and stream it on the fly using node.js, i.e send the continuous audio stream to client connected to node server. I am able to do this using package Darkice as recorder n encoder and Icecast as streaming server. Is it possible using WebRTC and node.js. Gabriel Poça > peace4all a year ago Yes, there are two ways you can do it. You can use the method I describe here, but instead of only record each audio chunk, send them to other browsers and inject them to html5 audio. There are some ways to do it but I can't find a good blog post on it right now. Other way to do it, which I recommend, is use this method to record audio, but use webrtc to stream audio in realtime to other browsers instead of using a node server in the middle. That's how I use it and it works great. 1 Robin Renwick > Gabriel Poça a year ago Hi Gabriel, thankyou so much for the tutorial, this has helped me a lot! I have a question that is very similar to peace4all's, and i am hoping that you may be able to help, or send a link to somewhere that would describe the process needed to be completed. If web audio is being created in the browser, what is the best way to send this data back to a server, as a continuos stream, convert it to an.ogg file, and then stored, so that it can be accessed at another browser. thank you so much! Gabriel Poça > Robin Renwick a year ago Hi Robin, thank you for your question. The process I describe in this tutorial allows you to stream audio to a server and record in wav format. After that you can maybe tutorial html audio capture streaming to node js no browser extensions 14/17

15 server and record in wav format. After that you can maybe run a process to convert from wav to ogg. And in the end mount a web server that gives access to your ogg files. I don't have the part of converting from wav to ogg, but you can see my code that covers the rest of the process here Robin Renwick > Gabriel Poça a year ago hi gabriel, thanks so much for this. I have managed try this out. The script does manage to create a.wav file in the project folder, but the file remains empty. Chrome does ask for permission to record, and i get the following messages in the terminal window when i access the localhost page. new connection new stream but it seems that the end process button does not work. do you know why this may be? also, i assume that i can just replace the node wav module with the same makers node ogg ( to get.ogg data? is this correct? sorry for all the questions! NTKOG a year ago Hi, thanks for the article. Just one tip for other people wants to try the code : createjavascriptnode is deprecated, use createscriptprocessor instead ( line 36 : recorder.js) Hengki Sihombing 2 years ago any github repo or full source code from this article? if you sharing the full code, it will helpfull for me to learn Thank :) Gabriel Poça > Hengki Sihombing 2 years ago Hi, yes, the link was hidden in the text. Here it is Feel free to ask any question! Paul Spaulding 2 years ago Do you know if it is possible (current browser technology) to do the same thing tutorial html audio capture streaming to node js no browser extensions 15/17

16 Do you know if it is possible (current browser technology) to do the same thing you described with audio and video? Stream audio/video to a node server and save it in a format that can later be replayed in another browser? I came across a collection of functions that someone wrote that sort of did this (not quite ready for real world use ). Also saw this: Thanks Gabriel Poça > Paul Spaulding Hi Paul, 2 years ago The method should work for video. The hardest part should be generating the video on the server. While doing my research I found that it should soon be available an easy way to do this. If you're looking to record video from a webrtc conference maybe you can use node webkit as peer on the conference and have it record with This thread has a lot of suggestions Thank you for your comment. Assaf Koren > Gabriel Poça a year ago Hi Gabriel, this is a great post! do you know if there is already an implementation of the video generation on the server side? Thanks gabrielpoca > Assaf Koren a year ago Like streamming video trough webrtc? There are some libraries that can read socket.io streams and pipe to a video (or audio) element. Subscribe d Add Disqus to your site Add Disqus Add Privacy HANDCRAFTED BY tutorial html audio capture streaming to node js no browser extensions 16/17

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