libcamera: v4l2_device: Add MediaEntity contructor

Construct a V4L2Device from a MediaEntity device node path. While at
there mark constructor as explicit to avoid copy-construction.

Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp
index 59c5ac98..5809fc62 100644
--- a/src/libcamera/v4l2_device.cpp
+++ b/src/libcamera/v4l2_device.cpp
@@ -12,6 +12,7 @@
 #include <unistd.h>
 
 #include "log.h"
+#include "media_object.h"
 #include "v4l2_device.h"
 
 /**
@@ -94,6 +95,17 @@ V4L2Device::V4L2Device(const std::string &devnode)
 {
 }
 
+/**
+ * \brief Construct a V4L2Device from a MediaEntity
+ * \param entity The MediaEntity to build the device from
+ *
+ * Construct a V4L2Device from a MediaEntity's device node path.
+ */
+V4L2Device::V4L2Device(const MediaEntity &entity)
+	: V4L2Device(entity.devnode())
+{
+}
+
 V4L2Device::~V4L2Device()
 {
 	close();