some security cards have multiplexed inputs to a single capture chip. These will have just one video device, and your application would have to handle the multiplexing.
--bob
At 10:21 AM 1/18/2002 -0800, Brian Warkentin wrote:
I've been reading with some interest some people's tests with newer
cards designed for the security industry having 4 or more composite
video inputs. We currently have a card here that has this using the
Bt878 chip. Not being too familiar yet with driver coding I may be
asking something that is not possible but here goes.
Is it feasable in such a 4 input card to map each channel to a separate
device - ie. /dev/video0, 1, 2, 3 and have the one driver handle all at
once. Would such a driver allow "simultaneous" capture from all 4
channels - I suppose the driver itself would do some sort of internal
switching...
How would such a system handle non-capturing opens?
Would such a system scale for other cards with PCI bridges and more than
1 Btxxxx chip and more than 4 inputs?
Or, is this concept totally incorrect and the driver provides only 1
/dev/video0 per card - regardless of the number of channels on the card
and the user app must handle the switching and channel management.
Thanks in advance
--
Brian Warkentin
bwarkentin@xxxxxxxxxxxxxxxxx
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