node.js - Stream recorded audio from browser to server

Question

I would like to live stream recorded audio from the browser to the server and play it. The server will end up being a embedded device that plays these audio streams.

So far I've successfully recorded audio and encoded it into a WAVE file and play it on the browser using the web audio API and following this tutorial.

Now I have a stream of .WAV encoded blobs. I tried finding ways to stream these to a nodejs backend with a web socket connection and play them using a npm module. But I haven't had any luck.

Does anyone know of any resources or modules I should follow? Maybe I should try a different approach? The audio needs to be played relatively quickly on the server since recording on the browser.

Answer 1

I'm doing this currently with some software that allows for streaming to internet radio servers via your web browser.

I use the WebAudio API along with getUserMedia to get live PCM audio data from the sound device. From there, I convert this data from 32-bit float to 16, 12, or 8 bit data depending on the amount of bandwidth available. This converted int samples are written to a stream setup with BinaryJS which wraps streams on both the Node.js and the client. As a bonus with BinaryJS, you can have as many streams open as you want, so I use a second stream over the same WebSocket connection for control data.

http://demo.audiopump.co:3000/