Merge "Camera: Update HAL interface doc for high speed video batching"
diff --git a/camera/device/3.2/types.hal b/camera/device/3.2/types.hal
index fe1edbf..c7d38c1 100644
--- a/camera/device/3.2/types.hal
+++ b/camera/device/3.2/types.hal
@@ -151,6 +151,13 @@
* android.lens.opticalStabilizationMode (if it is supported)
* android.scaler.cropRegion
* android.statistics.faceDetectMode (if it is supported)
+ * 6. To reduce the amount of data passed across process boundaries at
+ * high frame rate, within one batch, camera framework only propagates
+ * the last shutter notify and the last capture results (including partial
+ * results and final result) to the app. The shutter notifies and capture
+ * results for the other requests in the batch are derived by
+ * the camera framework. As a result, the HAL can return empty metadata
+ * except for the last result in the batch.
*
* For more details about high speed stream requirements, see
* android.control.availableHighSpeedVideoConfigurations and