Link

https://forum.xda-developers.com/mi-a1

camera:

https://forum.xda-developers.com/mi-a1/themes/oreo-mia1-stock-rom-camera-app-custom-t3758543

twrp:

https://forum.xda-developers.com/mi-a1/development/recovery-twrp-3-1-1-0-touch-recovery-t3688472

lineageos:

https://forum.xda-developers.com/mi-a1/development/rom-lineageos-15-1-t3757938