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For driver testing purpose the --offset option can be used to modify the
userspace buffers alignment. Instead of a fixed page-boundary alignment,
buffers can now be aligned to a fixed offset starting to the beginning
of the page.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Userspace buffers size needs to be passed to drivers on VIDIOC_QBUF. Set
the v4l2_buffer::length field to the size of the allocated buffer before
calling VIDIOC_QBUF.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Some devices need userspace buffers to be page-aligned. Use the
posix_memalign function instead of malloc to allocate page-aligned
buffers.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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For uncompressed formats in capture devices, the v4l2_buffer::bytesused
field should have the same value as the v4l2_pix_format::sizeimage field
reported by the VIDIOC_G_FMT ioctl.
Print a warning on VIDIOC_DQBUG when the values don't match.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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