I was interested in how Apple AirPlay screen mirroring is implemented in this super cheap Chinese HDMI dongles. Apple’s protocol is closed source and was reverse engineered back in in 2004. I couldn’t find an up to date open source project which implements a AirPlay server supporting screen mirroring. So lets see what this HDMI dongles have under the hood.
I purchased a device from ELEGIANT. I think there are also devices, sold under a different brand which are based on the same hardware.
Just a quick summery of the found hardware components.
ARM Cortex A7 dual core
128MB DDR3 SPI
Connected via USB interface