Reversing a camera
Per pictures the main chip is TXW817 (chinese, eng, google translate)
The interesting implementation is in libvdp.so, part of the apk bundle. This repo uses Frida for live analysis of the .so file.
Take APK from emulator/sacrificial device
adb shell pm list packages | grep ysx
adb shell pm path com.ysxlite.cam
adb shell pm path com.ysxlite.cam | while read -r line ; do adb pull $(echo $line | cut -d: -f2-) ; done
Push to sacrificial device
adb install-multiple *apk