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2019-01-24libcamera: camera: Add disconnection notificationNiklas Söderlund
As camera object have the potential to outlive the hardware they represent, there is a need to inform the camera that the underlying device has been disconnected, and in turn to notify applications. Implement a disconnection notification mechanism that can be used by pipeline handlers to notify the camera of disconnection. The camera then block all new API calls and emit the disconnected signal. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-01-24libcamera: camera: Associate cameras with their pipeline handlerNiklas Söderlund
The PipelineHandler which creates a Camera is responsible for serving any operation requested by the user. In order forward the public API calls, the camera needs to store a reference to its pipeline handler. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> --- Changes since v1: - Create pipeline handlers is shared pointers, make them inherit from std::enable_shared_from_this<> and stored them in shared pointers.
2019-01-23libcamera: event_dispatcher: Add interrupt() functionLaurent Pinchart
The new interrupt() function allows interrupting in-progress blocking processEvents() calls. This is useful to stop running event loops. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-01-21libcamera: camera: Handle camera objects through shared pointersLaurent Pinchart
The Camera class is explicitly reference-counted to manage the lifetime of camera objects. Replace this open-coded implementation with usage of the std::shared_ptr<> class. This API change prevents pipeline handlers from subclassing the Camera class. This isn't deemed to be an issue. Mark the class final to make this explicit. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-01-21libcamera: camera_manager: Register cameras with the camera managerLaurent Pinchart
Cameras are listed through a double indirection, first iterating over all available pipeline handlers, and then listing the cameras they each support. To simplify the API make the pipeline handlers register the cameras with the camera manager directly, which lets the camera manager easily expose the list of all available cameras. The PipelineHandler API gets simplified as the handlers don't need to expose the list of cameras they have created. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-01-21libcamera: camera_manager: Use std::unique_ptr to store event dispatcherLaurent Pinchart
The CameraManager takes ownership of the dispatcher passed to the setEventDispatcher() function. Enforces this by using std::unique_ptr<>. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-01-17include: linux: Import V4L2 uAPI headers from Linux v4.19Kieran Bingham
Import the following files from the Linux UAPI to keep our V4L2 interface in sync: media-bus-format.h v4l2-common.h v4l2-controls.h v4l2-mediabus.h v4l2-subdev.h videodev2.h Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-01-16libcamera: camera_manager: Turn enumerator into a unique_ptr<>Laurent Pinchart
Convey the fact that the CameraManager class owns the DeviceEnumerator instance it creates by using std::unique_ptr<> to store the pointer. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-01-10libcamera: Update libcamera.hLaurent Pinchart
libcamera.h hasn't been updated with the recently added public headers event_notifier.h, signal.h and timer.h. Add them. The event_dispatcher_poll.h header, which used to be public, is now private, but hasn't been removed from libcamera.h. Remove it. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-01-08libcamera: Add a poll-based event dispatcherLaurent Pinchart
Provide a poll-based event dispatcher implementation as convenience for applications that don't need a custom event loop. The poll-based dispatcher is automatically instantiated if the application doesn't provide its own dispatcher. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-01-08libcamera: Add event notification infrastructureLaurent Pinchart
Add three new classes, EventDispatcher, EventNotifier and Timer, that define APIs for file descriptor event notification and timers. The implementation of the EventDispatcher is meant to be provided to libcamera by the application. The event dispatcher is integrated twith the camera manager to implement automatic registration of timers and events. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-01-08libcamera: Add signal/slot communication mechanismLaurent Pinchart
Introduce a Signal class that allows connecting event sources (signals) to event listeners (slots) without adding any boilerplate code usually associated with the observer or listener design patterns. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-01-08libcamera: camera_manager: Make the class a singletonLaurent Pinchart
There can only be a single camera manager instance in the application. Creating it as a singleton helps avoiding mistakes. It also allows the camera manager to be used as a storage of global data, such as the future event dispatcher. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2019-01-04libcamera: camera_manager: Sort includes alphabeticallyLaurent Pinchart
Alphabetically sorted includes help finding where to insert new include statements, and avoiding duplicates. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-01-04libcamera: camera_manager: Remove put() methodLaurent Pinchart
The method is declared but not implemented. Remove it. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-01-02libcamera: Remove libcamera classLaurent Pinchart
The class was just a placeholder, now that we have other objects defined, remove it along with the associated test. The libcamera/libcamera.h header is kept as a shortcut to include the whole libcamera public API. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2018-12-31libcamera: camera_manager: add CameraManager classNiklas Söderlund
Provide a CameraManager class which will handle listing, instancing, destruction and lifetime management of cameras. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2018-12-31libcamera: Add Camera classNiklas Söderlund
Provide a Camera class which represents our main interface to handling camera devices. This is a rework of Kieran's initial proposal and Laurent's documentation of the file changed to fit the device enumerators needs. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
2018-12-19libcamera: include: Import media.h from Linux v4.19Jacopo Mondi
In order to avoid depending on system headers that may be outdated compared to the kernel version available at runtime, import the Linux kernel headers related to the APIs that libcamera requires a recent version of. This allows libcamera to use the latest kernel APIs even when compiled on older systems. The library must of course test at runtime whether those APIs are available and fallback to older APIs in order to support older kernels. Import media.h for the recent media controller APIs. The file is extracted verbatim from kernel v4.19. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2018-12-11build: Clean up file names variablesLaurent Pinchart
The build system defines two variables, public_api and sources, that store the names of the public headers and the source files respectively. These files will need to be referenced when generating documentation from source code, so let's make the variable names more descriptive: - Rename public_api to libcamera_api and use the files() function - Rename sources to libcamera_sources - Add a libcamera_headers variable to hold the internal headers Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2018-12-06libcamera: Use the logger instead of coutLaurent Pinchart
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2018-12-06Add boilerplate headers comments and include guardsLaurent Pinchart
The initial main.cpp and libcamera.h files are missing boilerplate header comments. libcamera.h is further missing include guards. Add them. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2018-11-28meson: Replace tabs for spacesKieran Bingham
Tabs are disliked within the meson build system. Replace indentation by spaces, in all existing locations. Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2018-11-27include: Install include filesKieran Bingham
The include directory was defined but not installed. Add it to the meson build structure to incorporate it as part of the library install. To facilitate the same include paths in our internal includes, update the structure for headers to match the install structure. Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2018-10-24build: Provide initial meson infrastructureKieran Bingham
Define the starting points for the libcamera build using meson and ninja build components. An initial 'dummy' library class is created, and a test binary links against the shared library calling it's init_lib() function. Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>