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[media] em28xx: add function scale_to_size()
Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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@ -815,6 +815,17 @@ static void size_to_scale(struct em28xx *dev,
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*vscale = EM28XX_HVSCALE_MAX;
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}
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static void scale_to_size(struct em28xx *dev,
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unsigned int hscale, unsigned int vscale,
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unsigned int *width, unsigned int *height)
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{
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unsigned int maxw = norm_maxw(dev);
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unsigned int maxh = norm_maxh(dev);
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*width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
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*height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
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}
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/* ------------------------------------------------------------------
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IOCTL vidioc handling
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------------------------------------------------------------------*/
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@ -890,9 +901,7 @@ static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
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}
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size_to_scale(dev, width, height, &hscale, &vscale);
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width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
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height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
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scale_to_size(dev, hscale, hscale, &width, &height);
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f->fmt.pix.width = width;
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f->fmt.pix.height = height;
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