Which mechanism(jni/library) used for HDMI IN connectivity

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Source code for Android HDMI IN apk -VIM 4

Dear Nick, I have a streaming product where I use BPI-W2 (android) and stream HDMI Input from camera to youtube with custom HTML overlays. I want to switch to VIM 4 and use same app here. Need to get code on getting HDMI video source. Can you please share source code for any APK that has functionality to take the HDMI input video? Preferably the one where hdmi source is exposed as default camera.