[MPlayer-dev-eng] [PATCH] blue back tv feature (automute with no signal)

[Trent Piepho]

On Thu, 24 May 2007, Vladimir Voroshilov wrote:
> 2007/5/23, Vladimir Voroshilov <voroshil at gmail.com>:
> > Hi, All.
> >
> > Attached patch implements nice feature, already existed in many
> > software and standalone tvs: auto muting video and audio when no (or
> > too poor quality)
> > signal presents. Currently implemented only for v4l and v4l2.
> > The idea was offered by Karthik Kumar.
> >
> > Disadvantages:
> > 1. ioctl call overhead (ioctl for getting signal strength is called
> > from copy_frame, i.e.at least every 1/25 sec for PAL). Is this bad or
> > not ?

If the driver for the tuner actually queries the tuner via I2C, that ioctl
could take a while.