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Commit cc914d2e authored by Shuzhen Wang's avatar Shuzhen Wang
Browse files

Camera: document multiResolution raw behavior 

Document that mutiResolution RAW can be supported for a logical camera
without RAW capability.

Test: Build
Bug: 269221911
Change-Id: I8cb569466c3f9abb17f70f2f254b22cd6314cb8a
parent 37fa82fa

camera/ndk/include/camera/NdkCameraMetadataTags.h

+19 −18
Original line number Diff line number Diff line
@@ -9682,24 +9682,25 @@ typedef enum acamera_metadata_enum_acamera_request_available_capabilities { 
     * camera's crop region is set to maximum size, the FOV of the physical streams for the

     * ultrawide lens will be the same as the logical stream, by making the crop region

     * smaller than its active array size to compensate for the smaller focal length.</p>

     * <p>There are two ways for the application to capture RAW images from a logical camera

     * with RAW capability:</p>

     * <ul>

     * <li>Because the underlying physical cameras may have different RAW capabilities (such

     * as resolution or CFA pattern), to maintain backward compatibility, when a RAW stream

     * is configured, the camera device makes sure the default active physical camera remains

     * active and does not switch to other physical cameras. (One exception is that, if the

     * logical camera consists of identical image sensors and advertises multiple focalLength

     * due to different lenses, the camera device may generate RAW images from different

     * physical cameras based on the focalLength being set by the application.) This

     * backward-compatible approach usually results in loss of optical zoom, to telephoto

     * lens or to ultrawide lens.</li>

     * <li>Alternatively, to take advantage of the full zoomRatio range of the logical camera,

     * the application should use <a href="https://developer.android.com/reference/android/hardware/camera2/MultiResolutionImageReader.html">MultiResolutionImageReader</a>

     * to capture RAW images from the currently active physical camera. Because different

     * physical camera may have different RAW characteristics, the application needs to use

     * the characteristics and result metadata of the active physical camera for the

     * relevant RAW metadata.</li>

     * <p>For a logical camera, typically the underlying physical cameras have different RAW

     * capabilities (such as resolution or CFA pattern). There are two ways for the

     * application to capture RAW images from the logical camera:</p>

     * <ul>

     * <li>If the logical camera has RAW capability, the application can create and use RAW

     * streams in the same way as before. In case a RAW stream is configured, to maintain

     * backward compatibility, the camera device makes sure the default active physical

     * camera remains active and does not switch to other physical cameras. (One exception

     * is that, if the logical camera consists of identical image sensors and advertises

     * multiple focalLength due to different lenses, the camera device may generate RAW

     * images from different physical cameras based on the focalLength being set by the

     * application.) This backward-compatible approach usually results in loss of optical

     * zoom, to telephoto lens or to ultrawide lens.</li>

     * <li>Alternatively, if supported by the device,

     * <a href="https://developer.android.com/reference/android/hardware/camera2/MultiResolutionImageReader.html">MultiResolutionImageReader</a>

     * can be used to capture RAW images from one of the underlying physical cameras (

     * depending on current zoom level). Because different physical cameras may have

     * different RAW characteristics, the application needs to use the characteristics

     * and result metadata of the active physical camera for the relevant RAW metadata.</li>

     * </ul>

     * <p>The capture request and result metadata tags required for backward compatible camera

     * functionalities will be solely based on the logical camera capability. On the other