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You can download the HDMIN demo code from follow link. And use android studio tools to compile.
https://github.com/OpenSource-Wesion/hdmiin
Demo provides two ways to use HDMI-IN.
(1) Use Camera2 API interface. The Camera interface can capture and record input image data. Up to 1080P@60.
(2) Use Tv API interface. The Tv interface can only display input image data and does not support setting resolution.