How? Internet Radio Station
by C1200
The backend
The backend is just a basic Express server running with Socket.io.
When the server receives an audio chunk from the broadcaster client it gets written straight to FFmpeg running as a child process of the server. FFmpeg then outputs a m3u8 playlist and a set of segment files into the public directory.
I also made an API to query for live and on demand streams.
The frontend (broadcaster)
The frontend uses modern Web APIs such as the Web Audio API. I used this API to merge microphone
audio with the audio coming from the <audio> element (the one that plays the music). I then use
a MediaRecorder to record the merged audio. When each chunk of data is ready, it is sent off to
the server over Socket.io.