Configure USB camera front or rear

The default is front.

Temporary modification method

• Front

  adb shell setprop persist.sys.uvc.facing front

• Back

  adb shell setprop persist.sys.uvc.facing back

Code modification method

• Android7.1/Android10

  • In the device/rockchip/CPU_TYPE/PRODUCT_TYPE/system.prop file, add the following content:

    • Front

    persist.sys.uvc.facing=front

    • Back

    persist.sys.uvc.facing=back

• Android11/Android12

  • In the device/rockchip/CPU_TYPE/PRODUCT_TYPE/PRODUCT_TYPE.mk file, add the following content:

    • Front

    PRODUCT_PROPERTY_OVERRIDES += persist.sys.uvc.facing=front

    • Back

    PRODUCT_PROPERTY_OVERRIDES += persist.sys.uvc.facing=back

• Delete build.prop in the out directory

  rm out/target/product/PRODUCT_TYPE/obj/ETC/system_build_prop_intermediates/build.prop