Hi all, thought i'd take the leap and get in to BlizMax.. its very different to B+/B3d gonna take some time to get my head round this. Ok, im using the Escapi dll to grab video from a usb capture device. Using the example with the addition of "Delay 1" lets me grab video to the screen at 720 * 576 @ 25fps using just 20% CPU on my C2D 1.66 .. lovely but what i want is to capture at half this resolution and resize the image up to 720 * 576. I have some how found my way and managed to get it working but it seems resizing a Pixmap is REALLY slow. Can someone help me speed this up? Learning curve is a bit steep! Code below is what i have so far. Thanks, hope someone can help. Oh, and its leaking memory like a tea bag. Cant find how you free a Pixmap.. is that what you even do??
' Thanks to Freak from the PureBasic forums for assistance!
Type SimpleCapParams
Field mTargetBuf:Byte Ptr ' Must be at least mWidth * mHeight * SizeOf(Int) of size!
Field mWidth
Field mHeight
End Type
Global InitCOM () "C"
Global CountCaptureDevices () "C"
Global OpenCaptureDevice (device, scp:Byte Ptr) "C"
Global CloseCaptureDevice (device) "C"
Global GetCapture (device) "C"
Global CaptureDone (device) "C"
Global CaptureDeviceName (device, name:Byte Ptr, namelen) "C"
Global ESCAPIDLLVersion () "C"
Function SetupESCAPI ()
esc = LoadLibraryA ("escapi.dll")
If esc
InitCOM = GetProcAddress (esc, "initCOM")
CountCaptureDevices = GetProcAddress (esc, "countCaptureDevices")
OpenCaptureDevice = GetProcAddress (esc, "initCapture")
CloseCaptureDevice = GetProcAddress (esc, "deinitCapture")
GetCapture = GetProcAddress (esc, "doCapture")
CaptureDone = GetProcAddress (esc, "isCaptureDone")
CaptureDeviceName = GetProcAddress (esc, "getCaptureDeviceName")
ESCAPIDLLVersion = GetProcAddress (esc, "ESCAPIDLLVersion")
If InitCOM = Null Or CountCaptureDevices = Null Or OpenCaptureDevice = Null Or..
CloseCaptureDevice = Null Or GetCapture = Null Or CaptureDone = Null Or..
CaptureDeviceName = Null Or ESCAPIDLLVersion = Null
DebugLog "Function missing!"
Return 0
EndIf
InitCOM ()
If ESCAPIDLLVersion () < $200
DebugLog "Old DLL (needs version 2.0+)"
Return 0
EndIf
Else
DebugLog "Failed to open DLL"
Return 0
EndIf
Return 1
End Function
Function CaptureDevice$ (device)
Local cam:Byte [1024]
CaptureDeviceName (device, cam, 1024)
Return String.FromCString (cam)
End Function
If SetupESCAPI () = 0
Notify "Error! Make sure escapi.dll is in same folder and capture device plugged in!"
End
EndIf
For num = 0 Until CountCaptureDevices ()
Print "Capture device [" + num + "] name: " + CaptureDevice (num)
Next
device = 0
' To list/select devices...
'Repeat
' device = Int (Input ("Enter capture device number: "))
'Until device > -1 And device < CountCaptureDevices ()
' Preferred target width/height (ESCAPI scales capture data to this)...
width = 360
height = 288
AppTitle = "Using " + CaptureDevice (device) + "..."
Graphics width * 2, height * 2', 32
' Data structure...
Local scp:SimpleCapParams = New SimpleCapParams
' A PixMap for captured data...
pix:TPixmap = CreatePixmap (width, height, PF_BGRA8888)
' Stick pixmap memory pointer into data structure...
scp.mTargetBuf = PixmapPixelPtr (pix)
scp.mWidth = width
scp.mHeight = height
' Start capture process...
If OpenCaptureDevice (device, scp) = 0
Print "Failed to initialise capture device!"
End
EndIf
Repeat
Cls
GetCapture (device)
Repeat
Delay 1
If KeyHit (KEY_ESCAPE) Then quit = True
Until CaptureDone (device)
pix2:TPixmap = ResizePixmap(pix, 720, 576)
DrawPixmap(pix2, 0, 0)
Flip
Until quit = True
' Stop capture process...
CloseCaptureDevice (device)
End
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