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v4l2: v4l2_compat: Add V4L2 compatibility layer

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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>
This commit is contained in:
Paul Elder 2019-12-06 04:14:52 -05:00
parent a3b80f3af8
commit 0ce8f2390b
10 changed files with 1486 additions and 0 deletions
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4
src/meson.build
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@ -6,3 +6,7 @@ subdir('libcamera')
subdir('ipa')
subdir('cam')
subdir('qcam')
if get_option('v4l2')
subdir('v4l2')
endif