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authorPaul Elder <paul.elder@ideasonboard.com>2020-06-19 13:02:19 +0900
committerPaul Elder <paul.elder@ideasonboard.com>2020-06-25 23:41:15 +0900
commitd37ec82515fda4ae014d904e6d50cd0ed0ada850 (patch)
tree41e9dbb16c3ef35126db5c9b79e4bce4ea757ac9 /test/controls/control_value.cpp
parent58732e4b49583e0b035980d71e8d15e76bbaf77b (diff)
v4l2: v4l2_camera_file: Add V4L2CameraFile to model the opened camera file
With relation to opening files, the kernel has three objects related to files: - inodes, that represent files on disk - file objects, that are allocated at open() time and store all data related to the open file - file descriptors, that are integers that map to a file In the V4L2 compatibility layer, V4L2CameraProxy, which wraps a single libcamera camera via V4L2Camera, is more or less equivalent to the inode. We also already have file descriptors (that are really eventfds) that mirror the file descriptors. Here we create a V4L2CameraFile to model the file objects, to contain information related to the open file, namely if the file has been opened as non-blocking, and the V4L2 priority (to support VIDIOC_G/S_PRIORITY later on). This new class allows us to more cleanly support multiple open later on, since we can move out of V4L2CameraProxy the handling of mapping the fd to the open file information. Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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