html5 audio capture

index.js

// get latest canary and turn on web audio in chrome://flags

navigator.webkitGetUserMedia({audio:true}, function (stream) {
  var context = new webkitAudioContext()
  var streamSource = context.createMediaStreamSource(stream)
  var sent = false

  bufferFiller = context.createJavaScriptNode(2048, 1, 1)
  bufferFiller.onaudioprocess = function(e) {
    if (sent) return
    console.log(JSON.stringify(e.inputBuffer.getChannelData(0)))
    sent = true
  }
  
  streamSource.connect(bufferFiller)
  bufferFiller.connect(context.destination)

}, function(){})

output.json

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if anyone knows how to create binary FLAC streams in javascript let me know!

see also http://www.smartjava.org/content/record-audio-using-webrtc-chrome-and-speech-recognition-websockets

I was just working with the same stuff. Don't know about creating FLACs in JS, but it's pretty easy to create a WAV in Python using SciPy's wavfile.

@maxogden you're looking for a JavaScript FLAC encoder, right? Last.fm wrote a decoder if you're interested.

https://github.com/ofmlabs/flac.js

Hi, I'm one of the authors of FLAC.js (the FLAC decoder linked to above) from Official.fm Labs. In addition to FLAC we've implemented decoders for ALAC, AAC, and MP3 which you can see at http://labs.official.fm/codecs/. Anyway, we're definitely interested in encoding and will probably tackle it at some point. Because FLAC is a lossless format, it is one of the simpler codecs to encode (and decode), so when we tackle encoding it will probably be one of the first codecs we implement. If anyone wants to help out in that effort, it would be greatly appreciated! All of our code is open source at https://github.com/ofmlabs. I think this could open up some interesting possibilities. Cheers!