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Merge "Camera: Relax physical stream cropping behavior" into rvc-dev

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TreeHugger Robot
2020-06-19 21:10:22 +00:00
committed by Android (Google) Code Review
parent 194bf13842 9c9b1085c3
commit 08465447a2
1 changed files with 29 additions and 13 deletions
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42
core/java/android/hardware/camera2/CameraMetadata.java
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@@ -952,19 +952,35 @@ 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>The field of view of non-RAW physical streams must not be smaller than that of the
* non-RAW logical streams, or the maximum field-of-view of the physical camera,
* whichever is smaller. The application should check the physical capture result
* metadata for how the physical streams are cropped or zoomed. More specifically, given
* the physical camera result metadata, the effective horizontal field-of-view of the
* physical camera is:</p>
* <pre><code>fov = 2 * atan2(cropW * sensorW / (2 * zoomRatio * activeArrayW), focalLength)
* </code></pre>
* <p>where the equation parameters are the physical camera's crop region width, physical
* sensor width, zoom ratio, active array width, and focal length respectively. Typically
* the physical stream of active physical camera has the same field-of-view as the
* logical streams. However, the same may not be true for physical streams from
* non-active physical cameras. For example, if the logical camera has a wide-ultrawide
* configuration where the wide lens is the default, when the crop region is set to the
* logical camera's active array size, (and the zoom ratio set to 1.0 starting from
* Android 11), a physical stream for the ultrawide camera may prefer outputing images
* with larger field-of-view than that of the wide camera for better stereo matching
* margin or more robust motion tracking. At the same time, the physical non-RAW streams'
* field of view must not be smaller than the requested crop region and zoom ratio, as
* long as it's within the physical lens' capability. 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 size, and zoom ratio set to 1.0, the physical
* stream for the tele lens will be configured to its maximum size crop region (no zoom).</p>
* <p><em>Deprecated:</em> Prior to Android 11, the field of view of all non-RAW physical streams
* cannot be larger than that of non-RAW logical streams. If the logical camera has a
* wide-ultrawide lens configuration where the wide lens is the default, when the logical
* 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>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