Prior to kernel v4.19, the MEDIA_IOC_G_TOPOLOGY ioctl didn't expose
entity flags. Fallback to calling MEDIA_IOC_ENUM_ENTITIES for each
entity to retrieve the flags in that case.
Fixes: 67d313240c ("libcamera: pipeline: uvcvideo: create a V4L2Device for the default video entity")
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
The media entity flags can be useful for pipeline handlers to find the
default device in a media graph which is marked with the
MEDIA_ENT_FL_DEFAULT flag. This will be especially useful for the UVC
pipeline handler where the entity names differ per device.
Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Add class definition and methods to associate a Camera with specific data
in the pipeline_handler base class.
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Create a udev_monitor in the udev device enumerator to listen to media
device disconnection, and emit the corresponding media device's
disconnect signal in response.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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>
The signal is emitted when the hardware device corresponding to the
media device is unplugged. This will trigger the full unplug handling
chain.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
The MediaDevice class will be the entry point to hot-unplug, as it
corresponds to the kernel devices that will report device removal
events. The class will signal media device disconnection to pipeline
handlers, which will clean up resources as a result.
This can't be performed synchronously as references may exist to the
related Camera objects in applications. The MediaDevice object thus
needs to be reference-counted in order to support unplugging, as
otherwise pipeline handlers would be required to drop all the references
to the media device they have borrowed synchronously with the
disconnection signal handler, which would be very error prone (if even
possible at all in a sane way).
Handle MedieDevice instances with std::shared_ptr<> to support this.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
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.
Nothing should inherit from the factory classes created by the
REGISTER_PIPELINE_HANDLER() macro. Declare them as final instead of only
declaring their create() method final.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Instead of passing the camera manager pointer to the match() function,
and later to more PipelineHandler functions, store it in the
PipelineHandler::manager_ member variable at construction time and
access it from there.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
There is no need for pipeline_handler.h to include camera.h, instead it
should be included in the source file which needs it;
camera_manager.cpp.
Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
The capabilities structure from the kernel can return capabilities of the
driver, or potentially more specific device capabilities.
Handle this with an inline function 'device_caps()' to return the device
specific capabilities when available, or fall back to the driver capabilities
otherwise.
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Pipeline handlers such as the upcoming ucvideo handler need the model
name to properly name the Camera objects they create. Store the model
name when querying the media device info and handle it in a similar
fashion as the driver name which is already retrieved.
Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Log categories are used to group log messages by topic. Introduce
support for categories by making the LOG() macro variadic. Support for
configuring log level per category will be introduced in a subsequent
commit.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
The MediaEntity::setDeviceNode() function was designed to set the device
node path associated with a MediaEntity. The function was there, but the
devnode_ member field was never actually set. Fix this.
While at there add a getter method for the devnode_ member as it will
soon be used.
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Media entities convey information about their main function in the
'function' field of 'struct media_v2_entity'.
Store the main function in the MediaEntity function_ class member and provide
a getter function for that.
While at there update comments, keep the MediaPad description in sync
with the MediaEntity one and remove a stale TODO entry.
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
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>
Nesting namespace names in a single namespace declaration is a C++17
feature. As libcamera depends on C++11 only, nest two separate namespace
declarations instead.
Reported-by: Shik Chen <shik@google.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
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>
C++14 introduces std::make_unique<>() that makes it easier to initialize
unique_ptr<> instances. As libcamera is limited to C++11, implement our
own version of the function in the libcamera::utils namespace.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
While the DeviceEnumerator::search() function doesn't modify the
instance directly, it returns a non-const pointer to a MediaEntity that
is owned by the DeviceEnumerator instance. This breaks the const
semantics. Don't mark the function as const.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
The PipelineHandlerFactory::handlers() static method returns a list of
factories, not a list of handlers. Rename it accordingly.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Pipeline handler factories are register in a map indexed by their name,
and the list of names is used to expose the factories and look them up.
This is unnecessary cumbersome, we can instead store factories in a
vector and expose it directly. The pipeline factory users will still
have access to the factory names through the factory name() function.
The PipelineHandlerFactory::create() method becomes so simple that it
can be inlined in its single caller, removing the unneeded usage of the
DeviceEnumerator in the factory.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Add a function to the MediaLink class to set the state of a link to
enabled or disabled. The function makes use of an internal MediaDevice
method, which is defined private and only accessible by the MediaLink
setEnabled() function itself.
Also add to MediaDevice a function to reset all links registered in the
media graph.
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Add three overloaded functions 'link()' to retrieve a link between two
pads. Each overloaded implementation exposes a different method to
identify the source and sink pads.
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Add a MediaDevice member field to the MediaObject class hierarcy.
Each media object now has a reference to the media device it belongs to,
and which it has been created by.
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
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>
The system libraries define macro's for major/minor through
<sys/types.h> on some versions of GCC/GLibc.
To prevent namespace collisions with these macros, rename our major and
minor device node accessors.
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Replace usage of the DeviceInfo class with MediaDevice in the
DeviceEnumerator and remove the DeviceInfo class.
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Extend the MediaEntity object with device node major and minor numbers,
and retrieve them from the media graph using interfaces. They will be
used by the DeviceEnumerator to retrieve the devnode path.
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Most errors recorded during graph parsing are logged but not propagated
to the caller. Fix this and delete objects that are created but not
successfully added to the graph to avoid memory leaks. As the error code
returned from the addObject() and populate*() functions doesn't matter
much, turn them into bool functions.
Additionally, add a way to query whether the media graph was valid, and
clear objects before populating the graph to avoid leaking them.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
The MediaDevice object implements handling and configuration of the media
graph associated with a media device.
The class allows enumeration of all pads, links and entities registered in
the media graph.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Add a class hierarcy to represent all media objects a media graph represents.
Add a base MediaObject class, which retains the global unique object id,
and define the derived MediaEntity, MediaLink and MediaPad classes.
This hierarchy will be used by the MediaDevice objects which represents and
handles the media graph.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
