Greetings!
I would like to 'improve' (or simply extend)
the SVDRP Grab command to allow for grabbing
a picture from a given channel, if possible,
without disturbing normal operations
basic idea:
get a device which is capable of tuning
the specified channel (optionally shared
transponder)
tune to the channel/stream, and wait until
data is available (or some timeout has been
reached)
grab a screenshot (similar to current grab)
now, what I tried so far is the following
(with little success :)
cChannel *gChan = Channels.GetByNumber(ChanNum);
cDevice *gDev = cDevice::GetDevice(gChan, 0, 1);
gDev->SwitchChannel(gChan, 1);
if (gDev->HasLock(5000) && gDev->HasProgramme())
Image = gDev->GrabImage(ImageSize, Jpeg, Quality, SizeX, SizeY);
the problems with this approach are:
the primary device changes, even if the
transponder is the same
the grabbed image is black, because the
data is not available when the actual grab
happens
any suggestions how to do that properly?
TIA,
Herbert
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