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Airplay mirroring with HDMI dongles

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.

Hardware

Just a quick summery of the found hardware components.

CPU

Rockchip RK3036G
ARM Cortex A7 dual core

RAM

128MB DDR3 SPI
Winbond W691GG6KB

Flash

16MB SPI
Winbond W25Q128BVIG
ID: 0x00ef4018

WiFi

Realtek RTL8188ETV
Connected via USB interface

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