Merge "Camera: Clarify multi-camera RAW and FOV behaviors" into qt-dev

1 files changed, 18 insertions, 0 deletions

diff --git a/core/java/android/hardware/camera2/CameraMetadata.java b/core/java/android/hardware/camera2/CameraMetadata.java
index d3575c03c9f6..3ffc21d2c6e3 100644
--- a/core/java/android/hardware/camera2/CameraMetadata.java
+++ b/core/java/android/hardware/camera2/CameraMetadata.java
@@ -906,6 +906,24 @@ public abstract class CameraMetadata<TKey> {
      * <li>{@link CameraCharacteristics#LENS_POSE_REFERENCE android.lens.poseReference}</li>
      * <li>{@link CameraCharacteristics#LENS_DISTORTION android.lens.distortion}</li>
      * </ul>
+     * <p>The field of view of all non-RAW physical streams must be the same or as close as
+     * possible to that of non-RAW logical streams. If the requested FOV is outside of the
+     * range supported by the physical camera, the physical stream for that physical camera
+     * will use either the maximum or minimum scaler crop region, depending on which one is
+     * closer to the requested FOV. For example, for a logical camera with wide-tele lens
+     * configuration where the wide lens is the default, if the logical camera's crop region
+     * is set to maximum, the physical stream for the tele lens will be configured to its
+     * maximum crop region. On the other hand, if the logical camera has a normal-wide lens
+     * configuration where the normal lens is the default, when the logical camera's crop
+     * region is set to maximum, the FOV of the logical streams will be that of the normal
+     * lens. The FOV of the physical streams for the wide 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>Even if the underlying physical cameras have different RAW characteristics (such as
+     * size or CFA pattern), a logical camera can still advertise RAW capability. In this
+     * case, when the application configures a RAW stream, the camera device will make sure
+     * the active physical camera will remain active to ensure consistent RAW output
+     * behavior, and not switch to other physical cameras.</p>
      * <p>To maintain backward compatibility, the capture request and result metadata tags
      * required for basic camera functionalities will be solely based on the
      * logical camera capabiltity. Other request and result metadata tags, on the other