gstreamer: allocator: Ensure camera manager stay alive

Without the camera manager, it is not possible to cleanly delete the
FrameBufferAllocator object. Keep the camera manager alive until all the
memory object have been released.

A shared_ptr to the CameraManager is introduced which is itself stored
as a plain pointer and allocated and released explicitly. When more
than one C++ member is required, this can be refactored to use a new C++
class, but the struct _GstLibcameraAllocator is allocated and freed by
glib, so it does not have automatic destruction presently.

Bug: https://bugs.libcamera.org/show_bug.cgi?id=211
[Kieran: Update test framework to remove expected test fail]
Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

1 files changed, 15 insertions, 1 deletions

diff --git a/src/gstreamer/gstlibcameraallocator.cpp b/src/gstreamer/gstlibcameraallocator.cpp
index 741ed592..7e4c904d 100644
--- a/src/gstreamer/gstlibcameraallocator.cpp
+++ b/src/gstreamer/gstlibcameraallocator.cpp
@@ -100,6 +100,11 @@ struct _GstLibcameraAllocator {
 	 * FrameWrap.
 	 */
 	GHashTable *pools;
+	/*
+	 * The camera manager represents the library, which needs to be kept
+	 * alive until all the memory has been released.
+	 */
+	std::shared_ptr<CameraManager> *cm_ptr;
 };
 
 G_DEFINE_TYPE(GstLibcameraAllocator, gst_libcamera_allocator,
@@ -173,6 +178,9 @@ gst_libcamera_allocator_finalize(GObject *object)
 
 	delete self->fb_allocator;
 
+	/* Keep last. */
+	delete self->cm_ptr;
+
 	G_OBJECT_CLASS(gst_libcamera_allocator_parent_class)->finalize(object);
 }
 
@@ -193,11 +201,17 @@ gst_libcamera_allocator_new(std::shared_ptr<Camera> camera,
 {
 	auto *self = GST_LIBCAMERA_ALLOCATOR(g_object_new(GST_TYPE_LIBCAMERA_ALLOCATOR,
 							  nullptr));
+	gint ret;
+
+	self->cm_ptr = new std::shared_ptr<CameraManager>(gst_libcamera_get_camera_manager(ret));
+	if (ret) {
+		g_object_unref(self);
+		return nullptr;
+	}
 
 	self->fb_allocator = new FrameBufferAllocator(camera);
 	for (StreamConfiguration &streamCfg : *config_) {
 		Stream *stream = streamCfg.stream();
-		gint ret;
 
 		ret = self->fb_allocator->allocate(stream);
 		if (ret == 0)