[media] vb2: if bytesused is 0, then fill with output buffer length

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The application should really always fill in bytesused for output
buffers, unfortunately the vb2 framework never checked for that.

So for single planar formats replace a bytesused of 0 by the length
of the buffer, and for multiplanar format do the same if bytesused is
0 for ALL planes.

This seems to be what the user really intended if v4l2_buffer was
just memset to 0.

I'm afraid that just checking for this and returning an error would
break too many applications. Quite a few drivers never check for bytesused
at all and just use the buffer length instead.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Pawel Osciak <pawel@osciak.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

...

This commit is contained in:

Hans Verkuil 2014-04-07 08:57:48 -03:00 • committed by Mauro Carvalho Chehab

parent 412376a153

commit 61bd8fb37d

1 changed files with 26 additions and 5 deletions

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drivers/media/v4l2-core/videobuf2-core.c

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