bbb-transcription-controller

Controls the transcription of voice streams coming from BigBlueButton.

This node.js app listens to ESL events from Freeswitch and uses mod_audio_fork to send the audio data into a voice transcription server. The returning transcription is then sent into Redis and can be displayed by the HTML5 client

Running

npm install

node app.js

Configuration

The configuration file has comments explaining each of its parts

VOSK servers

To spawn you own VOSK servers using docker use this:

docker run -d -p 2700:2700 alphacep/kaldi-en:latest

alphacep's docker hub has images for most of their language models

Vosk listens on a websocket and I've set up a reverse proxy to make configuration easier. Here's an example nginx config file:

vosk-en.conf
location /voskEN {
 proxy_pass http://127.0.0.1:2700;
  proxy_http_version 1.1;
  proxy_set_header Upgrade $http_upgrade;
  proxy_set_header Connection "Upgrade";
  proxy_read_timeout 60s;
  proxy_send_timeout 60s;
  client_body_timeout 60s;
  send_timeout 60s;
}