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    SubjectRe: [PATCH 1/1] V4L: stk11xx, add a new webcam driver
    Date
    On Monday 28 May 2007 17:14:51 Markus Rechberger wrote:
    > On 5/28/07, Mauro Carvalho Chehab <mchehab@infradead.org> wrote:
    > > We don't do format conversions in kernel. Instead, you should return a
    > > proper Bayer Fourcc format (like V4L2_PIX_FMT_SBGGR8).
    >
    > It's ok in his case since most userspace applications do not support
    > this format, it helps noone if there's a driver out there which isn't
    > supported by most userspace applications and I don't expect that all
    > applications will add a conversion for that format soon.
    > This would moreover raise the question about a userspace library,
    > though there are many more important issues which are outstanding and
    > which got smashed down.

    Markus, I do think the userspace library is THE real problem with the whole
    V4L subsystem. It's annoying to keep repeating why these convertions should
    be done outside the kernel, be them in a library or not. I deliberatly never
    implemented the above convertion in the drivers that I have been maintaing
    for years, since I had the idea that this approach whould have pushed the
    developers to write the _best_ algorithm by themselves. I still think it's
    the correct approach, but now I give up. Mauro, if you are planning to accept
    this BayerToSomething color convertion, be also prepared to accept the same
    convertion for other drivers in the kernel. Rules are made for everyone.

    Best regards,
    Luca
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