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The following diagram illustrates the video capture controller found on Matrox
Morphis QxT.
From Decoder 0
From Decoder 15
The video capture controller contains 16 capture controllers.
Capture controllers
Each capture controller performs the following:
• Each sets the conditions under which to start and end a grab. Examples of grabbing
conditions are whether to grab one or two fields per frame, or whether to start the
grab on an odd or even field. Set the capture controller conditions using the
MIL-Lite MdigControl() function.
• Each can generate interrupts, based on various grabbing events. You can hook a
function to these events using the MIL-Lite function MdigHookFunction(). The
various events that can cause an interrupt are listed in the following table:
H o o k T y p e
M _ G R A B _ S T A R T
M _ G R A B _ E N D
M _ G R A B _ F I E L D _ E N D _ O D D
M _ G R A B _ F I E L D _ E N D _ E V E N
Capture
Controller
Capture
Controller
Video capture controller
D e s c r i p t i o n
H o o k t o t h e s t a r t o f e a c h g r a b .
H o o k t o t h e e n d o f e a c h g r a b .
H o o k t o t h e e n d o f g r a b b e d o d d f i e l d s .
H o o k t o t h e e n d o f g r a b b e d e v e n f i e l d s .
Acquisition section
Acquisition memory
(128 MB)
35
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