public void Clear( )
{
mCapDriverConnectStatus = false; // capDriverConnect()
mHWNDCapture = IntPtr.Zero;
mSTVideoCaptureFormat = STVideoCaptureFormat.BGR320x240;
mCapturePeriodMilliseconds = 67; // 67 milliseconds --> 15 frames per second maximum
mClientCaptureCallback = null;
mBGRData = null;
}
Initialize
(
IntPtr hwndParentWindow, // This must be non-null
STVideoCaptureFormat videoCaptureFormat,
int capturePeriodMilliseconds,
DelegateClientCaptureCallback delegateClientCaptureCallback
)
{
this.Clear( );
// Validate capture format
int captureWidth = 0;
int captureHeight = 0;
switch (videoCaptureFormat)
{
case STVideoCaptureFormat.BGR320x240: { captureWidth = 320; captureHeight = 240; } break;
}
if ((0 == captureWidth) || (0 == captureHeight))
{
System.Console.WriteLine("Invalid capture format.");
this.Clear( );
return(false);
}
this.mSTVideoCaptureFormat = videoCaptureFormat;
// We create a capture window only because we are required to create
// such a window to use the Video for Windows (VFW32) API. We make
// this window tiny to keep it out of the way of our application.
// For our purposes, this window is simply a necessary interface to
// VFW functionality.
this.mHWNDCapture =
capCreateCaptureWindow
(
"STVideoCapture Window",
(WS_CHILD | WS_VISIBLE | WS_CLIPCHILDREN | WS_CLIPSIBLINGS), // style
0, // x
0, // y
4, // width
4, // height
hwndParentWindow, // Parent window : This must be non-null
0 // nID
);
if (IntPtr.Zero == this.mHWNDCapture)
{
System.Console.WriteLine("Failed to create video capture window.");
DestroyWindow(this.mHWNDCapture);
this.Clear( );
return(false);
}
this.mCapDriverConnectStatus = capDriverConnect(this.mHWNDCapture, 0);
if (false == this.mCapDriverConnectStatus)
{
System.Console.WriteLine("Failed to connect to video driver.");
DestroyWindow(this.mHWNDCapture);
this.Clear( );
return(false);
}
// CAPDRIVERCAPS capdrivercaps = new CAPDRIVERCAPS( );
// NOT FINISHED SUPPORT FOR THIS: capDriverGetCaps( mHWNDCapture, ref capdrivercaps, 44 );
//capDlgVideoFormat( this.mHWNDCapture );
//capDlgVideoSource( this.mHWNDCapture ); // Source; Brightness, Contrast, Saturation, Exposure
// Allocate a local buffer to store capture data
int bytesPerPixel = 3;
switch (videoCaptureFormat)
{
case STVideoCaptureFormat.BGR320x240: { bytesPerPixel = 3; } break;
}
int totalImageBytes = 0;
totalImageBytes = (captureHeight * (captureWidth * bytesPerPixel));
this.mBGRData = new byte[totalImageBytes];
// Set the video stream callback function
this.mClientCaptureCallback = delegateClientCaptureCallback;
capSetCallbackOnFrame(this.mHWNDCapture, STVideoCapture.mCommonCaptureCallback);
// Set the preview rate in milliseconds
this.mCapturePeriodMilliseconds = capturePeriodMilliseconds;
capPreviewRate(this.mHWNDCapture, capturePeriodMilliseconds);
// Disable preview mode
capPreview(this.mHWNDCapture, false);
// Set the format of the data we wish returned to us
BITMAPINFO capbitmapinfo = new BITMAPINFO( );
capbitmapinfo.bmiHeader.biSize = 40; // sizeof( BITMAPINFOHEADER )
capbitmapinfo.bmiHeader.biWidth = captureWidth;
capbitmapinfo.bmiHeader.biHeight = captureHeight;
capbitmapinfo.bmiHeader.biPlanes = 1;
capbitmapinfo.bmiHeader.biBitCount = 24;
capbitmapinfo.bmiHeader.biCompression = BI_RGB;
capbitmapinfo.bmiHeader.biSizeImage = totalImageBytes;
capbitmapinfo.bmiHeader.biXPelsPerMeter = 100;
capbitmapinfo.bmiHeader.biYPelsPerMeter = 100;
bool setVideoFormatResult = false;
setVideoFormatResult = capSetVideoFormat(this.mHWNDCapture, capbitmapinfo, 44);
if (false == setVideoFormatResult)
{
System.Console.WriteLine("Failed to set the desired video capture format.");
capSetCallbackOnFrame(this.mHWNDCapture, null); // disable the callback function
DestroyWindow(this.mHWNDCapture);
this.Clear( );
return(false);
}
return(true);
}
