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authorNiklas Söderlund <niklas.soderlund@ragnatech.se>2019-10-28 00:21:48 +0100
committerNiklas Söderlund <niklas.soderlund@ragnatech.se>2020-01-12 16:10:37 +0100
commitcadae67e45785dc5dc005adb63c2dec841f44b1d (patch)
treef90fd44076c47aa052e3979866e79c48d2093dda /test/pipeline/ipu3
parent9e71540ebbde3592805aff0e2e26803406b2e15c (diff)
libcamera: v4l2_videodevice: Add FrameBuffer interface
Add a new interface in parallel with the existing Buffer implementation to also support FrameBuffer. The reason it's added in parallel is to aid in the migration from Buffer to FrameBuffer throughout libcamera. With this change discrete parts of libcamera can be migrated and tested independently. As the new interface is added in parallel there are some oddities in this change which will be undone in a follow up patch once libcamera have migrated away from the Buffer interface. - There is a nasty hack in V4L2VideoDevice::bufferAvailable(). It is needed to allow both interfaces to exist and function at the same time. The idea is if buffers are allocated using the FrameBuffer interface V4L2VideoDevice::cache_ is set and we know to call the FrameBuffer 'buffer ready' signal, and likewise if it's not to call the Buffer variant. - There is some code duplication between the two interfaces as they aim to solve the same thing in slightly different ways. As all Buffer related code is soon to be removed no effort to create code sharing between them have been made. - Some function and variables which can't be distinguished by their argument types have been given a frameBuffer prefix instead of a buffer prefix. They are clearly documented in the code and will be renamed to the correct buffer prefix when the Buffer interface is removed. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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