For devices running Android 9, camera devices must support replacing one logical YUV/RAW stream with physical streams of the same size (doesn't apply to RAW streams) and the same format from two physical cameras. This doesn't apply to devices running Android 10.

To fully take advantage of features enabled by multi-camera while maintaining app compatibility, follow these best practices when implementing a logical multi-camera device:

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Android 9 introduced API support for multi-camera devices through a new logical camera device composed of two or more physical camera devices pointing in the same direction. The logical camera device is exposed as a single CameraDevice/CaptureSession to an app allowing for interaction with HAL-integrated multi-camera features. Apps can optionally access and control underlying physical camera streams, metadata, and controls.

All boxes are available through AcuSpec, Inc. (www.acuspecinc.com, fred@acuspecinc.com) and MYWAY Manufacturing (www.myway.tw, sales@myway.tw). Additionally, the rev1 ITS box can be purchased through West-Mark (www.west-mark.com, dgoodman@west-mark.com).

If individual requests are supported, process and apply the individual physicalCameraSettings that can arrive as part of capture requests and append the individual physicalCameraMetadata accordingly.

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For Camera HAL device versions 3.5 (introduced in Android 10) or higher, populate the ANDROID_LOGICAL_MULTI_CAMERA_ACTIVE_PHYSICAL_ID result key using the ID of the current active physical camera backing the logical camera.

For a logical camera, the mandatory stream combinations for the camera device of a certain hardware level is the same as what's required in CameraDevice.createCaptureSession. All of the streams in the stream configuration map must be logical streams.

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Adding two raw streams, one from each physical camera, if the logical camera doesn't advertise RAW capability, but the underlying physical cameras do. This usually occurs when the physical cameras have different sensor sizes.

A logical camera device should operate in the same way as a physical camera device based on its hardware level and capabilities. It's recommended that its feature set is a superset of that of individual physical cameras.

Logical multi-camera devices must pass camera CTS like any other regular camera. The test cases that target this type of device can be found in the LogicalCameraDeviceTest module.

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Using physical streams in place of a logical stream of the same size and format. This must not slow down the frame rate of the capture when the minimum frame duration of the physical and logical streams are the same.

Both the logical camera and its underlying physical cameras must guarantee the mandatory stream combinations required for their device levels.

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Populate ANDROID_REQUEST_AVAILABLE_PHYSICAL_CAMERA_REQUEST_KEYS with a list of supported parameters for individual physical cameras. The list can be empty if the logical device doesn't support individual requests.

To take advantage of HAL-implemented optical zoom by switching between physical sub-cameras during RAW capture, apps must configure physical sub-camera streams instead of a logical RAW stream.

For a logical camera device supporting RAW capability with physical sub-cameras of different sizes, if an app configures a logical RAW stream, the logical camera device must not switch to physical sub-cameras with different sensor sizes. This ensures that existing RAW capture apps don't break.

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Camera clients can query the camera ID of the physical devices a particular logical camera is made of by calling getPhysicalCameraIds(). The IDs returned as part of the result are then used to control physical devices individually through setPhysicalCameraId(). The results from such individual requests can be queried from the complete result by invoking getPhysicalCameraResults().

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Individual physical camera requests may support only a limited subset of parameters. To receive a list of the supported parameters, developers can call getAvailablePhysicalCameraRequestKeys().

For devices running Android 10 where the camera HAL device version is 3.5 or higher, the camera device must support isStreamCombinationSupported for apps to query whether a particular stream combination containing physical streams is supported.

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Replacing one logical YUV_420_888 or raw stream with two physical streams of the same size and format, each from a separate physical camera, given that the size and format are supported by the physical cameras.

Sensor_fusion is a second test rig that enables repeated, prescribed phone motion and asserts that the gyroscope and image sensor timestamps match and that the multi-camera frames are in sync.

The scene 1 and scene 4 tests run with the ITS-in-a-box test rig. The test_multi_camera_match test asserts that the brightness of the center of the images match when the two cameras are both enabled. The test_multi_camera_alignment test asserts that camera spacings, orientations, and distortion parameters are properly loaded. If the multi-camera system includes a Wide FoV camera (>90o), the rev2 version of the ITS box is required.

In this diagram, different camera IDs are color coded. The app can stream raw buffers from each physical camera at the same time. It is also possible to set separate controls and receive separate metadata from different physical cameras.

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