On Wed September 19 2012 17:18:11 Sylwester Nawrocki wrote:
> Hi Hans,
>
> On 09/19/2012 04:37 PM, Hans Verkuil wrote:
> > From: Hans Verkuil <hans.verk...@cisco.com>
> >
> > It's a queue-global value, so keep it there rather than with the
> > buffer struct.
>
> I would prefer not doing this. It makes the path to variable
> number of per buffer planes more difficult.
You can't have a variable number of planes per buffer. You can decide not to
fill certain planes (e.g. set bytesused to 0 or something), but that's a
different thing.
So applications will always need to set up q->num_planes elements of the array.
And in the MMAP case all planes need to be mmap()ed. You can't have one buffer
that's setup with only 2 planes while all others are setup with 3 planes.
Regards,
Hans
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