android_device_samsung_a20/CAMERA.md

Exynos7885 Camera

Patches needed

• sed -i 's/_ZN7android8hardware6camera6device4V3_214implementation12CameraDevice24getCameraCharacteristicsENSt3__18functionIFvNS1_6common4V1_06StatusERKNS0_8hidl_vecIhEEEEE/_ZN7android8hardware6camera6device4V3_214implementation12CameraDevice24getEurekaCharacteristicsENSt3__18functionIFvNS1_6common4V1_06StatusERKNS0_8hidl_vecIhEEEEE/g' camera.device@3.2-impl.so
• sed -i 's/_ZN7android8hardware6camera6device4V3_214implementation12CameraDevice4openERKNS_2spINS3_21ICameraDeviceCallbackEEENSt3__18functionIFvNS1_6common4V1_06StatusERKNS6_INS3_20ICameraDeviceSessionEEEEEE/_ZN7android8hardware6camera6device4V3_214implementation12CameraDevice4nukeERKNS_2spINS3_21ICameraDeviceCallbackEEENSt3__18functionIFvNS1_6common4V1_06StatusERKNS6_INS3_20ICameraDeviceSessionEEEEEE/g' camera.device@3.2-impl.so
• patchelf --add-needed libcorrectcamera.so camera.device@3.2-impl.so

Camera IDs reported by Exynos camera module

• Camera ID 0 = Back primary camera, this camera has correct resolution and direction, no need to touch.
• Camera ID 1 = Mixed cam which has back secondary cam's resolution and front cam's direction. But the camera hal should open this id to access front camera.
• Camera ID 2 = Fake front camera, which has correct values, displays correct direction. But camera hal cannot open this camera, if it tries to, it throws an error.
• Canera ID 50 = Back secondary camera, which is not shown with AOSP original camera provider HAL. Need to manually query and add it with custom provider HAL.

Hacks

• In libcorrectcamera shim, if the Android OS request info for cam id 1, it will ask the Exynos camera module with cam id 2, and get the correct resolution for front cam.
• In custom camera provider, We ask for additional camera info, rear back cam, id 50, and add it to camera device list. Also, gets rid of useless camera id 2, which info is mapped to cam id 1.