Streaming Audio as a group to AirPlay 1/2 and Google Cast Speakers

So I had this idea that we could easily stream audio to both the Apple and Google ecosystems since they both use similar technology like mDNS and udp/tls. Well, I thought it was simple and I'm pretty sure it was done before, but oh well its working now.

I tested it and got it working by streaming from my android phone using my AirAudio Streamer app and set my homepod, macbook and Google Nest as a "group audio stream". Although, each speaker needs to be calibrated to correct the audio delay using the audio sync feature.

I'm wondering if the app is working only for my setup or if it is more universally compatible to other third market Google cast speakers? I've kinda reached my limit for testing for available devices to test with.

Can you give it a try with other types of speakers and see if you run into any issues? It only works on AirPlay 1 & 2 and Cast. Technically, you could create a speaker group consisting of a macbook, iMac, appletv, homepod mini pair, homepod and a cast speaker(S) and stream to them all at the same time in sync.

I haven't explored this yet but do you think it is possible to stream audio to iPad or iPhone over AirPlay? I'm also exploring methods to add bluetooth for alexa, but i'm still figuring out ways for bluetooth to sync with homepods which has a 1750 ms delay. Any Ideas?

If your using the app remember to use the audio-sync feature on every speaker in the group to fix the audio drift and difference in latency. Also It seems that a Nest cast speaker drifts more than a Homepod, so you may have to recalibrate the cast speaker for long streaming sessions (2+ hrs). I'm still working on a fix for that.

The app is "AirAudio Streamer for AirPlay" on the google store. Only for android atm.

Any feedback would be awesome! Thanks!