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2019-02-06libcamera: pipeline: vimc: Implement capture supportNiklas Söderlund
Replace the buffer allocation, capture start/stop and request queue stubs with real implementations. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-02-06libcamera: pipeline: vimc: Set a default formatNiklas Söderlund
Pick a default format for the one stream in a vimc camera. This is just a starting point to define a good default format for the vimc camera, and is expected to evolve over time as the capabilities of the library grows. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-02-06libcamera: pipeline: uvcvideo: Implement capture supportKieran Bingham
Replace the buffer allocation, capture start/stop and request queue stubs with real implementations. Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-02-06libcamera: camera: Extend the interface to support captureNiklas Söderlund
In order to support capture, the camera needs methods to allocate and free buffers, to start and stop the capture and to queue requests. Define those interfaces in the Camera class and implement them to call the corresponding pipeline handler methods. Once a camera is started the pipeline handler of the camera will begin processing requests queued to the camera by the application until it gets stopped. Once a request is created it can be queued to the camera and the application will be notified asynchronously once the request is completed and be able to process all the buffers involved in the request. At this point the request objects don't support controls. This will be extended in the future. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-02-06libcamera: camera: Cache the stream configuration in the stream objectNiklas Söderlund
The API towards the application and pipeline handler can be simplified if the camera caches which streams have been selected and their respective configuration. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-02-06libcamera: camera: Add helper to check for exclusive accessNiklas Söderlund
Some operations on the camera requires the application to have exclusive access to the camera. To help check for this in these operations add a helper. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-02-06libcamera: pipeline_handler: Extend the interface to support captureNiklas Söderlund
In order to support capture, the pipeline handler needs methods to allocate and free buffers, to start and stop the capture and to queue requests. Define those interfaces in the PipelineHandler class and implement them as stubs in the existing pipeline handlers. This initial implementation only considers the allocation of new buffers. Future work would need to expand this to also cover importing buffers from an external source. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-02-06libcamera: Provide a Request objectJacopo Mondi
Implement a Request object used by applications to queue image capture requests to a camera. Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-02-06libcamera: stream: Add stream configuration to the stream objectNiklas Söderlund
Add a cache of the active stream configuration to the stream object. This cache is to be updated from the Camera object and can be accessed read only from both the application and pipeline handlers. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-02-06libcamera: stream: Construct a streamKieran Bingham
Construct a stream object with a default internal pool. Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-02-06libcamera: Add V4L2SubdeviceJacopo Mondi
Add V4L2Subdevice class that provides an interface to interact with V4L2 defined sub-devices. Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-02-06libcamera: Add geometry.hJacopo Mondi
Add geometry-related definitions in the geometry.h internal header. Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-02-06libcamera: v4l2_device: Add comments to method parametersJacopo Mondi
Add missing parameter documentation for set and get format methods. Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-02-06libcamera: v4l2_device: Update dequeued buffer informationNiklas Söderlund
Copy the information from the struct v4l2_buffer when dequeueing the buffer as applications need this information to make sense of the captured data. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-02-06libcamera: v4l2_device: Implement stream{On,Off}Kieran Bingham
Support starting and stopping a stream on a V4L2 device. Buffers must be queued before the stream is started. Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-02-06libcamera: v4l2_device: Implement queue/dequeue operationsKieran Bingham
Provide queueBuffer() and dequeueBuffer() methods to interact with the V4L2Device. Buffers will be directly referenced from the bufferPool of the V4L2Device based on the index in the pool. The V4L2Device is now opened in non-blocking mode in order to avoid blocking the dequeueBuffer() method. A signal is emitted when a buffer is ready and has been dequeued. Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-02-06libcamera: v4l2_device: Request buffers from the deviceKieran Bingham
Provide an exportBuffers() function which allocates buffers with the MMAP method, exports them using the dmabuf API and populates the given BufferPool. Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-02-06libcamera: Add Buffer ManagementKieran Bingham
Provide classes that represent frame buffers and pools of frame buffers. An image within the system may use one or more Plane objects to track each plane in the case of multi-planar image formats. The Buffer class manages all of the data required to render or interpret the raw image data. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-02-05libcamera: v4l2_device: Improve documentationJacopo Mondi
Improve the V4L2DeviceFormat documentation as suggested during patches review. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-02-05libcamera: v4l2_device: s_format: Return the device formatJacopo Mondi
Return the device format actually applied to the device on setFormat(). Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-02-05libcamera: v4l2_device: Construct from MediaEntity*Jacopo Mondi
The V4L2Device constructor wants a "const MediaEntity &", while entities are usually retrieved by pointer before being used to construct a V4L2Device. Change the constructor argument to "const MediaEntity *". Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-02-04libcamera: pipeline: uvcvideo: set a default formatNiklas Söderlund
Pick a default format for the UVC one stream in a UVC camera. This is just a starting point to define a good default format for the UVC camera it's expected to evolve over time as the capabilities of the library grows. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2019-02-04libcamera: streams: extend stream configuration with buffer countNiklas Söderlund
The camera needs to be configured with the number of buffers required to satisfy the applications use case. While the application can request any number of buffers, the pipeline must take the constraints of the Linux driver into consideration. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2019-02-04libcamera: pipeline: vimc: create camera for Sensor BNiklas Söderlund
Create a camera for Sensor B of the vimc pipeline. At this stage only Sensor B is exposed while the are in total two sensors in the graph. Going forward Sensor A should also be exposed as another camera. Sensor B was chosen since the graph is configured correctly for it out of the box. As we lack control over sub devices formats it's not really possible to use Sensor A yet with the library. Once both cameras are registered with the library they should be extended to provide two streams each, one for the raw output and one for the output which uses the shared scaler. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2019-02-04libcamera: camera: Fix spelling errorKieran Bingham
Fix a small typo in the camera object documentation. cameera -> camera Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2019-02-03libcamera: v4l2_device: Set bytesperline in single plane S_FMTJacopo Mondi
The 'bytesperline' field of 'struct v4l2_pix_format' has to be set for the single planar set format use case. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-02-03libcamera: v4l2_device: Zero-initialize V4L2 formatJacopo Mondi
Zero initialize v4l2_format structures used to set and get format on the V4L2 device. Fixes: ba8da0f2fcd0 ("libcamera: v4l2_device: Add methods to get/set format") Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-02-03libcamera: v4l2_device: Rename plane format fieldsJacopo Mondi
Rename the number of valid plane formats to 'planesCount' and the actual per-plane size information array to 'planes'. Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-02-03libcamera: v4l2_device: Rename parameters to s/g_fmtJacopo Mondi
Rename parameters to get and set format functions to expand 'fmt' to 'format'. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-02-03libcamera: v4l2_device: Fix getFormatSingleplane ioctlJacopo Mondi
The single plane getFormat() function wrongly used the VIDIOC_S_FMT ioctl. Fix that by using the more opportune VIDIOC_G_FMT one. Fixes: ba8da0f2fcd0 ("libcamera: v4l2_device: Add methods to get/set format") Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-02-03libcamera: v4l2_device: Rename format() method to getFormat()Jacopo Mondi
Rename format() to getFormat() to reflect the v4l2 API names more closely. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-02-01cam: options: Add explicit conversion methods to OptionValueLaurent Pinchart
The OptionValue class defines operators to convert the variant to all the supported option types. As a convenience, add explicit methods to perform the same operations, avoiding the need to write long static_cast<>() statements in the caller. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-02-01cam: Add --format option to configure a streamNiklas Söderlund
Add an option to configure the first stream of a camera from an argument with options and parse the width, height and pixel format from that list. The pixel format is still specified as a integer which should correspond to the kernels FOURCC identifiers. Going forward this should be turned into a string representation and the cam parser should translate between the two. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-02-01cam: options: Add a key=value parserNiklas Söderlund
Some options passed to the cam utility need to be complex and specify a list of key=value pairs. Add a new parser to deal with these options, usable on its own to parse key=value pairs from any string. Integrate the KeyValueParser into the existing OptionsParser. The cam application can fully describe all its options in one location and perform full parsing of all arguments in one go. The KeyValueParser also integrates itself with the usage() printing of the OptionsParser. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-02-01cam: options: Add option type handling to options parserLaurent Pinchart
Extend the options parser with support for option types. All options must now specify the type of their argument, and the parser automatically parses the argument and handles errors internally. Available types are none, integer or string. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-02-01cam: options: Store options in a list instead of a vectorLaurent Pinchart
When option are added to the parser, they are stored in the OptionsParser::options_ vector, and a pointer to the option referencing the vector entry is indexed in the OptionsParser::optionsMap_ map. When the next option is added the vector may be resized, which invalidates the pointers stored in the map. Fix this by storing the options in an std::list<> instead of std::vector<>. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-02-01cam: options: Return whether addOption() succeeds or notNiklas Söderlund
To later extend the options handling to cover subparsing of arguments it will be needed to know if the addition of the option itself was successful or not. The information is already present in addOption() this change just makes it available. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-02-01cam: options: Create a template class for optionsNiklas Söderlund
In preparation to adding more parsers create a template class to hold the parsed information. The rational for making it a template are that different parsers can index the options using different data types. The OptionsParser index its options using an int while the upcoming KeyValyeParser will index its options using strings for example. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-02-01cam: options: Move struct OptionLaurent Pinchart
The Option structure is declared within the OptionsParser, but will later be needed by other parsers. Move it outside the OptionsParser class. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2019-02-01cam: options: Move enum OptionArgumentNiklas Söderlund
The enumeration of the different possibilities for arguments can be used by other parser then OptionsParser. Move it outside the class to make it ready to be used by other parsers. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-02-01libcamera: camera: extend camera object to support configuration of streamsNiklas Söderlund
Extend the camera to support reading and configuring formats for groups of streams. The implementation in the Camera are minimalistic as the heavy lifting are done by the pipeline handler implementations. The most important functionality the camera provides in this context is validation of data structures passed to it from the application and access control to the pipeline handler. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-02-01libcamera: pipeline: extend pipelines to support stream configurationNiklas Söderlund
All streams which are to be used for capture need to be configured at the same time. This allows the pipeline handler to take any dependencies between the different streams and their configuration into account when setting up the hardware. Extend the pipeline API and all pipeline implementations with two new functions, one to read a default configuration and one to set a new configuration. Both functions operate on a group of streams which the pipeline handler should consider when performing the operations. In the current implemented pipelines this is rather easy as they only have one stream each per camera. Furthermore as there is yet no way for the pipeline handlers to interact with the hardware all they do is return a null format, log that a default configuration has been requested and log that a new configuration has been set. Future work based on more components are needed to make the pipelines return a good default format and actually interact with the hardware. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-02-01libcamera: camera: extend camera object to support streamsNiklas Söderlund
A camera consists of one or more video streams originating from the same video source. The different streams could for example have access to different hardware blocks in the video pipeline and therefore be able to process the video source in different ways. All static information describing each stream need to be recorded at camera creation. After a camera is created an application can retrieve the static information about its streams at any time. Update all pipeline handlers to register one stream per camera, this will be extended in the future for some of the pipelines. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-02-01libcamera: camera: Add acquire() and release()Laurent Pinchart
Exclusive access must be obtained before performing operations that change the device state. Define an internal flag to track ownership and provide a means of protecting functions that change device configuration. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2019-02-01libcamera: stream: add initial StreamConfiguration structureNiklas Söderlund
Add an initial StreamConfiguration implementation to hold configuration data for a single stream of a Camera. In its current form not many configuration parameters are supported but it's expected the number of options will grow over time. At this stage the pixel format is represented as an unsigned int to allow for easy mapping to the V4L2 API. This might be subject to change in the future as we finalize how libcamera shall represent pixel formats. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-02-01libcamera: stream: add initial Stream classNiklas Söderlund
Add an initial Stream implementation. The idea is that once capability support is added to the library each stream will describe its capabilities using this class. An application will then select one or more streams based on these capabilities and use them to configure the camera and capture. At this stage the Stream class is empty as capabilities are yet to be added. The class is still useful as it will be used to communicate how many streams a Camera object provides. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-01-30libcamera: pipeline: uvcvideo: add error if no default video device is foundNiklas Söderlund
If for any reason a default video device is not found in the media graph the creation of the UVC pipeline silently failed. This is not optimal when debugging problems with the pipeline, add an error to notify the user of the issue. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2019-01-29libcamera: v4l2_device: Add methods to get/set formatJacopo Mondi
Add methods to set and get the image format programmed on a V4L2Device for both the single and multi planar use case. Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-01-29libcamera: v4l2-format: Add V4L2DeviceFormatJacopo Mondi
Add a V4L2DeviceFormat class aimed to be used to provide format configuration requests to a V4L2Device. Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
2019-01-29libcamera: ipu3: Re-work camera data registrationJacopo Mondi
Re-work camera data registration to create the cameraData pointer as unique_ptr<> and make clear its ownership model. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>