Gerd Knorr wrote:
Michel Bardiaux <mbardiaux@xxxxxxxxxxx> writes:
know I can use VIDIOCGTUNER to detect the loss of RF signal; but what
happens when one capture from COMPOSITE and the source of the
composite signal fails? And how can I detect that?
tuner.signal likely works for that too, depending on the driver. At
least bttv doesn't ask the tuner but checks the bt878 status register
to see whenever it has a signal or not ...
Gerd
It *does* work (at least with an Hercules SmartTV which is a BT878)!
Wunderschon! Thanks!
But this led me to a related question: when there is no composite or no
RF, I have seen that a sequence VIDIOCMCAPTURE+VIDIOCSYNC does not
block, an one gets either noise, or a frozen image, or a patchwork of
both. But what is the *timing*? Will VIDIOCSYNC return at once? None of
the V4L documents I have found seems to say anything about that.
--
Michel Bardiaux
Peaktime Belgium S.A. Bd. du Souverain, 191 B-1160 Bruxelles
Tel : +32 2 790.29.41
