Bt848 and Bt878 video capture .DLL functions declaration

[Sutthisak Phongthanapanic]

Does anybody has functions declaration of Bt848 and Bt878
video capture .dll related files such as Bt848_32.dll, Bt848DDI.dll
Bt848DLG.dll, Btvid_32.dll or BtUtil32.dll.

Thanks,


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P.Sutthisak

[Michael Ritter]

Sutthisak,

I am using the 848 in my project. I use the digitizers from
Imagenation and have converted all the calls to PB from C.
Their libraries may not function the same for you even though
the chip-set is the same. One could only find out through
testing however I am not at liberty to release their libraries
but I may be able to help if I know more. Particularly
can you tell me more about the board that you are using and
if permissible where to get the dll's. You can use Depends to
at least get the function names but that won't do you much
good without the params. Ideally you would have some C source
to port from.

cheers,

Michael

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[Sutthisak Phongthanapanic]

Michael,

The Bt848 and Bt878 video capture may be OEM products,
it's imported from Taiwan. The .DLLs that I taking about, are
provide as parts of driver (BT848A Driver for Win95, Rev1.0)
The .DLLs written by RSS - Brooktree Division.

Now, I use VfW to communicate with video capture but VfW doesn't
provide the functions to adjust such as brightness/contrassness
or RGB on the fly.

Thanks,


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P.Sutthisak

[Michael Ritter]

Sutthisak,

I bypass VFW and communicate directly to the board. In that
respect I have complete control over CBHS, levels, RGB or
YUV, Scaling, etc... This is good for my application because
it is very effecient since I need to manipulate RGB or YUV
directly with my own algo's, but I do lose plug in capability
across digitizers. Try these calls, (Remember to look up the
appropriate entry points with Depends because they may be named
different). At least you will get a good hint at what the
params should be for CBHS or Grabbing a RGB on the fly. Please
note however that there are many steps to setting up the
digitizer for a capture to a RGB buffer before using these
calls, such as:

a. Initializing the libraries
b. Requesting access to the digitizer (I think you may have
(problems here if you try to access the digi with VFW while
trying to access directly.)
c. Initializing the buffers to capture into. (this is a pain
because there are so many scales, bit depths, color types,
etc.)
d. Fields to capture and field to begin
e. Capture calls, (there are two, continuous push to Direct
Memory and Single Frame (Frame = Consisting of 2 fields)).
f. Releasing both grabber and the libraries.

If you would give me the name of the digitizer your using and
email me the dll's, ( [email protected] ) I will have a look.
Since my project uses these chipsets, I am always looking for
alternatives short of designing my own circuit.

Here are the calls I use for CBHS and to grab an RGB to a buffer.
Like I said though, setting up the buffers is important and
stressful for if they are not correct, you will GPF like mad.
You should have no trouble accessing and setting CBHS though.

Their scales are:
Brightness -0.5 to +0.5
Contrast 0.0 to +2.0 (Normal Gain is 1)
Hue -90 to +90 (Hue is ignored for PAL video sources)
Saturation 0.0 to 2.0

DECLARE FUNCTION PXC_Grab LIB "pxc.dll" _
ALIAS "Grab" (BYVAL fgh AS LONG, _
BYVAL frh AS LONG, BYVAL flags AS INTEGER) AS LONG

'HSV custom functions
DECLARE FUNCTION PXC_SetContrast LIB "pxc.dll" _
ALIAS "SetContrast" (BYVAL fgh AS LONG, _
BYVAL c AS SINGLE, BYVAL flags AS INTEGER) AS LONG

DECLARE FUNCTION PXC_SetBrightness LIB "pxc.dll" _
ALIAS "SetBrightness" (BYVAL fgh AS LONG, _
BYVAL b AS SINGLE, BYVAL flags AS INTEGER) AS LONG

DECLARE FUNCTION PXC_GetContrast LIB "pxc.dll" _
ALIAS "GetContrast" (BYVAL fgh AS LONG) AS SINGLE

DECLARE FUNCTION PXC_GetBrightness LIB "pxc.dll" _
ALIAS "GetBrightness" (BYVAL fgh AS LONG) AS SINGLE

DECLARE FUNCTION PXC_SetHue LIB "pxc.dll" _
ALIAS "SetHue" (BYVAL fgh AS LONG, _
BYVAL h AS SINGLE, BYVAL flags AS INTEGER) AS LONG

DECLARE FUNCTION PXC_SetSaturation LIB "pxc.dll" _
ALIAS "SetSaturation" (BYVAL fgh AS LONG, _
BYVAL s AS SINGLE, BYVAL flags AS INTEGER) AS LONG

DECLARE FUNCTION PXC_GetHue LIB "pxc.dll" _
ALIAS "GetHue" (BYVAL fgh AS LONG) AS SINGLE

DECLARE FUNCTION PXC_GetSaturation LIB "pxc.dll" _
ALIAS "GetSaturation" (BYVAL fgh AS LONG) AS SINGLE

Cheers,

Michael


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