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up vote 2 down vote favorite
1

I am working with node.js and I streamed my Audio to my node.js server. Now I noticed during the process of building the audio blob:

var audioBlob = new Blob([dataview], { type: 'audio/wav' });

That I get a ReferenceError at new Blob. It seems that Blob is not supported. How can I create a blob which I would like to save with node.js fs module.

Thanks guys!

share|improve this question
    
What is Blob? Where does it come from? – Pete Feb 1 '13 at 19:11
    
en.wikipedia.org/wiki/Binary_large_object – zer02 Feb 1 '13 at 19:11
    
All common browser support it developer.mozilla.org/de/docs/DOM/Blob – zer02 Feb 1 '13 at 19:12
    
Yeah, but a blob isn't a native Node.js type.. You know, Number, String, Boolean, Object, Array, etc. Why don't you create an object prototype or a module for NPM? Did you check NPM for anything like what you need? – sent1nel Feb 1 '13 at 19:15
1  
@zer02 Yes and no. You can always add a mime property to the Buffer since it's still dynamic. But, MIME types are for communicating binary data; not so much for saving to disk. – Jonathan Lonowski Feb 1 '13 at 20:37

2 Answers 2

up vote 2 down vote accepted

The Solution to this problem is to create a function which can convert between Array Buffers and Node Buffers. :)

Convert a binary NodeJS Buffer to Javascript ArrayBuffer

share|improve this answer
    
Did you managed to get it working? I can record the audio to a file but I can't listen to it although it has the right time. – Gabriel Apr 25 '14 at 20:37
    
Yes, it worked. – zer02 Apr 25 '14 at 20:44
    
can you help me? did you do something like this on the gist?gist.github.com/anonymous/11302966 – Gabriel Apr 25 '14 at 20:54
    
Yes, something like that. I can´t find the source code of my old project. – zer02 Apr 25 '14 at 21:15
up vote 0 down vote

As a suggestion, you might want to read this: http://howtonode.org/really-simple-file-uploads

I mean I guess I don't know what you're trying to do. There may not be a module for blobs, but if you want to just write something to disk, there's the fs module.. This code won't work directly, but..

var fs = require('fs')
  , express = require('express')

app.post('/upload', function (req, res) {
  // asynch call to write file to disk
  fs.write("/tmp/file.mp3", req.params.body, function (err) {
    if (err) console.log(err)
  });
  res.end();
});

Simply post an mp3, or anything really, to /upload, and it'll write it to disk. You can do whatever validation you want.

share|improve this answer
    
Hello I streamed the Audio Buffers of GetUserMedia Audio to my node.js server and want to encode the arrays to WAV. – zer02 Feb 1 '13 at 19:42
    
github.com/mattdiamond/Recorderjs – sent1nel Feb 1 '13 at 20:06
    
I have used recorder.js. I even extended it. The problem is creating the Blob serversided not client sided. I need to know if there is a way to create a blob inside node.js, because I am streaming the audio directly to node.js and would like to build the wav/mp3 file on the server. :-) – zer02 Feb 1 '13 at 20:30
    
Can you take the contents of the blob, put them into a buffer, and shoot the buffer across? Node knows how to handle buffers, AND you can put binary data into them. – sent1nel Feb 1 '13 at 20:42
    
I have already transfered the client sided blob binary to node.js (streamed), when the audio was recorded on the client side at the first place and processed it with node.js and it works. This time I want node.js to take control of the whole process. – zer02 Feb 1 '13 at 20:49

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