While you can do this, it means your device needs to be on (drawing power, running the radio, not on standby) for the whole stream, so the "normal", preferred m

While you can do this, it means your device needs to be on (drawing power, running the radio, not on standby) for the whole stream, so the "normal", preferred model is for the content server to stream directly to the chromecast, and your phone is just the remote control for that process. Exactly how this works is up to whoever writes the cast apps that you're using. APIs are over here: https://developers.google.com/cast/docs/developers https://developers.google.com/cast/docs/developers