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[media] em28xx: VIDIOC_ENUM_FRAMESIZES: consider the scaler limits when calculating the minimum frame size 

Output resolutions <=20% of the input resolution exceed the capabilities of the
scaler.

Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Frank Schaefer 2013-02-10 16:05:14 -03:00 committed by Mauro Carvalho Chehab
parent b837413835
commit 6c3598e641
1 changed files with 6 additions and 2 deletions
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8
drivers/media/usb/em28xx/em28xx-video.c
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@ -1405,8 +1405,12 @@ static int vidioc_enum_framesizes(struct file *file, void *priv,
/* Report a continuous range */
fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
fsize->stepwise.min_width = 48;
fsize->stepwise.min_height = 32;
scale_to_size(dev, EM28XX_HVSCALE_MAX, EM28XX_HVSCALE_MAX,
&fsize->stepwise.min_width, &fsize->stepwise.min_height);
if (fsize->stepwise.min_width < 48)
fsize->stepwise.min_width = 48;
if (fsize->stepwise.min_height < 38)
fsize->stepwise.min_height = 38;
fsize->stepwise.max_width = maxw;
fsize->stepwise.max_height = maxh;
fsize->stepwise.step_width = 1;