PACC enables you to use your Chromecast as an output device in Pulseaudio. This allows you to play music from your favorite player directly to your TV.
This is the Chromecast app. Once receiving the stream information from the Chrome app it plays the music from your PulseAudio PACC sink.
This app is hosted on https://pa2cc.github.io/cast_receiver/. It is automatically launched on your Chromecast once your Chrome app initiates a connection.
Have a look at the Chrome app for instructions how to use it.