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The V4L2 compatibility layer is licensed under the GPL. It is compiled
as a binary separate from libcamera.so, and is loaded into the address
space of processes through LD_PRELOAD to intercept calls to the C
library.
It is our understanding and intent that the GPL license doesn't
propagate to the binaries whose calls are intercepted, considering those
binaries are not derivative work of the V4L2 compatibility layer and are
not designed to be linked to the V4L2 compatibility layer. There is
however a possibly grey area if binaries are packaged with a shell
script wrapper that loads the V4L2 compatibility layer. This could lead
to license-related issues if such packaging is performed by Linux
distributions or system integrators.
To clarify the intent and lift the doubts, relicense the V4L2
compatibility layer under the LGPL. The V4L2 compatibility layer code
itself still benefits from the license protection, while its usage with
third-party binaries is clearly allowed as intended.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Jacopo Mondi <jacopo@jmondi.org>
Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Acked-by: Paul Elder <paul.elder@ideasonboard.com>
Acked-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Acked-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
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Now that libcamera creates threads internally and doesn't rely on an
application-provided event loop, remove the thread from the V4L2
compatibility layer. The split between the V4L2CameraProxy and
V4L2Camera classes is still kept to separate the V4L2 adaptation from
camera operation. This may be further refactored later.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
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Create a new FileOperations structure to hold all the dynamically-loaded
C library file operations. The file operations are now exposed publicly,
to prepare for usage of mmap in the V4L2CameraProxy.
A new template helper function is added to retrieve a symbol with
dlsym() with proper casting to simplify the V4L2CompatManager
constructor.
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>
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Add libcamera V4L2 compatibility layer.
This initial implementation supports the minimal set of V4L2 operations,
which allows getting, setting, and enumerating formats, and streaming
frames from a video device. Some data about the wrapped V4L2 video
device are hardcoded.
Add a build option named 'v4l2' and adjust the build system to
selectively compile the V4L2 compatibility layer.
For now we match the V4L2 device node to a libcamera camera based on a
devnum that a pipeline handler may optionally map to a libcamera
camera.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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