[pwc] Setting Framerate via V4L2?

To:
Subject:	[pwc] Setting Framerate via V4L2?
From:	Florian Echtler <>
Date:	Wed, 21 Jun 2006 22:33:26 +0200

Hello everybody,

I haven't (yet) subscribed to the list, so please send me a CC of your
reply - thanks.

I have noticed that there's no really usable way to set the desired
framerate when using the V4L2 API. The responsible code in pwc-v4l.c is

if (f->fmt.pix.priv) {
  compression = (f->fmt.pix.priv & PWC_QLT_MASK) >> PWC_QLT_SHIFT;
  snapshot = !!(f->fmt.pix.priv & PWC_FPS_SNAPSHOT);
  fps = (f->fmt.pix.priv & PWC_FPS_FRMASK) >> PWC_FPS_SHIFT;
  if (fps == 0)
    fps = pdev->vframes;
}

so there's no way to change only one of the parameters (especially as I
can't know the other values). Is there a reason for this?

Thanks, Yours, Florian

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