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author | Niklas Söderlund <niklas.soderlund@ragnatech.se> | 2019-01-22 16:47:40 +0100 |
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committer | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2019-01-25 01:59:28 +0200 |
commit | 607a9d7f5698fa514b66b0f0a53393fb8435ed12 (patch) | |
tree | 9d9ee3d111f0d877c9ca08c9a19a2abd5f8e45cf /include/linux/v4l2-subdev.h | |
parent | 889726097613ae5ed4d83a6fd0cc3b0b562f8659 (diff) |
libcamera: pipeline_handler: Add camera disconnection support
Pipeline handlers are responsible for creating camera instances, but
also for destroying them when devices are unplugged. As camera objects
are reference-counted this isn't a straightforward operation and
involves the camera manager and camera object itself. Add two helper
methods in the PipelineHandler base class to register a camera and to
register a media device with the pipeline handler.
When registering a camera, the registerCamera() helper method will add
it to the camera manager. When registering a media device, the
registerMediaDevice() helper method will listen to device disconnection
events, and disconnect all cameras created by the pipeline handler as a
response.
Under the hood the PipelineHandler class needs to keep track of
registered cameras in order to handle disconnection. They can't be
stored as shared pointers as this would create a circular dependency
(the Camera class owns a shared pointer to the pipeline handler). Store
them as weak pointers instead. This is safe as a reference to the camera
is stored in the camera manager, and doesn't get removed until the
camera is unregistered from the manager by the PipelineHandler.
Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Diffstat (limited to 'include/linux/v4l2-subdev.h')
0 files changed, 0 insertions, 0 deletions