@@ -357,6 +357,14 @@ Signals and Slots`_) to connect events with callbacks to handle them.
The ``Camera`` device emits two signals that applications can connect to in
order to execute callbacks on frame completion events.
+The ``Camera::metadataAvailable`` signal notifies applications of the
+availability of metadata results before a request completes. Receiving
+notification about metadata availability allows application to fast-track
+handling of metadata results before all the image buffers in a request are
+ready. The full list of metadata results associated with a Request is anyway
+available at request complete time, and receiving notifications for early
+metadata availability is an optional feature for applications.
+
The ``Camera::bufferCompleted`` signal notifies applications that a buffer with
image data is available. Receiving notifications about the single buffer
completion event allows applications to implement partial request completion