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libcamera: device_enumerator: Emit a signal when new devices are added

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Emit a signal whenever new MediaDevices are added to the
DeviceEnumerator. This will allow CameraManager to be notified
about the new devices and it can re-emumerate all the devices
currently present on the system.

Device enumeration by the CameraManger is an expensive operation hence,
we want one signal emission per 'x' milliseconds to notify multiple
devices additions as a single batch, by the DeviceEnumerator.
Add a \todo to investigate the support for that.

Signed-off-by: Umang Jain <email@uajain.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Umang Jain 2020-06-16 19:45:36 +00:00 • committed by Laurent Pinchart
parent c6f8ec7d8a
commit dd21ededd0
3 changed files with 19 additions and 2 deletions
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4
include/libcamera/internal/device_enumerator.h
View file

@ -13,6 +13,8 @@
#include <linux/media.h>
#include <libcamera/signal.h>
namespace libcamera {
class MediaDevice;
@ -43,6 +45,8 @@ public:
std::shared_ptr<MediaDevice> search(const DeviceMatch &dm);
Signal<> devicesAdded;
protected:
std::unique_ptr<MediaDevice> createDevice(const std::string &deviceNode);
void addDevice(std::unique_ptr<MediaDevice> &&media);