libcamera: camera: Assert pipelines complete all requests

When the camera manager calls stop on a pipeline, it is expected that
the pipeline handler guarantees all requests are returned back to the
application before the camera has stopped.

Ensure that this guarantee is met by providing an accessor on the
pipeline handler to validate that all pending requests are removed.

Reviewed-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/src/libcamera/pipeline_handler.cpp b/src/libcamera/pipeline_handler.cpp
index 3b3150bd..f41b7a7b 100644
--- a/src/libcamera/pipeline_handler.cpp
+++ b/src/libcamera/pipeline_handler.cpp
@@ -369,6 +369,21 @@ const ControlList &PipelineHandler::properties(const Camera *camera) const
  */
 
 /**
+ * \brief Determine if the camera has any requests pending
+ * \param[in] camera The camera to check
+ *
+ * This method determines if there are any requests queued to the pipeline
+ * awaiting processing.
+ *
+ * \return True if there are pending requests, or false otherwise
+ */
+bool PipelineHandler::hasPendingRequests(const Camera *camera) const
+{
+	const CameraData *data = cameraData(camera);
+	return !data->queuedRequests_.empty();
+}
+
+/**
  * \fn PipelineHandler::queueRequest()
  * \brief Queue a request
  * \param[in] request The request to queue