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Not all use cases of V4L2_MEMORY_MMAP require mapping buffers to
userspace. Separate the allocation and mapping to allow usage of
unmapped buffers.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Allocating buffers allocates resources that must be explicitly freed.
Calling v4l2_alloc_buffers() a second time without freeing the buffers
in between causes memory leaks and must not be allowed.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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The v4l2_device object is allocated dynamically by v4l2_open(), free it
in v4l2_close() to make the API symmetrical.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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The omap3-isp-live project [1] includes generic V4L2 support code that
implements the V4L2 API. Instead of reinventing the wheel, import the
code and use it.
The code has been modified to merge the V4L2 buffers pool implementation
in the V4L2 support code as the abstraction wasn't right for the
uvc-gadget project. Further refactoring will be performed separately.
The original license hasn't been modified from the original LGPL-2.1+.
The sole copyright owner is Laurent Pinchart.
[1] git://git.ideasonboard.org/omap3-isp-live.git
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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