public static extern int SendMessageW([In] IntPtr hWnd, int Msg, uint wParam, ref CAPTUREPARMS waveFormat);
/// <summary>
/// We can configure some settings related to capturing images from
/// the camera. Primarily we want to control how many buffers are
/// used in the capture process.
///
/// If we are doing continuous capture, we can configure
/// the interval between subsequent frames.
/// </summary>
public override void ConfigureCapture()
{
fCaptureParams = new CAPTUREPARMS();
capCaptureGetSetup(ref fCaptureParams);
// These are the core parameters that must be
// set when we're capturing video
fCaptureParams.dwRequestMicroSecPerFrame = (uint)CaptureInterval; // Start with 15 frames per second
fCaptureParams.wPercentDropForError = 10; // Percentage of frames that can drop before error is signaled
fCaptureParams.fYield = true; // If set to true, a thread will be spawned
fCaptureParams.wNumVideoRequested = 2; // Maximum number of video buffers to allocate
// Related to capturing audio
fCaptureParams.fCaptureAudio = false;
fCaptureParams.wNumAudioRequested = 0;
fCaptureParams.dwAudioBufferSize = 0;
fCaptureParams.fLimitEnabled = false;
fCaptureParams.wTimeLimit = 0;
fCaptureParams.fDisableWriteCache=false;
fCaptureParams.AVStreamMaster=0;
// Used when capturing to a file
fCaptureParams.dwIndexSize = 0; // Determines the limit of audio/video buffers that can be captured
fCaptureParams.wChunkGranularity = 0;
// Related to MCI
fCaptureParams.fMCIControl = false;
fCaptureParams.fStepMCIDevice = false;
fCaptureParams.dwMCIStartTime = 0;
fCaptureParams.dwMCIStopTime = 0;
fCaptureParams.fStepCaptureAt2x = false;
fCaptureParams.wStepCaptureAverageFrames = 5;
// These are related to mouse and keyboard control of capturing
// Since we want total control of the capture process
// we don't want these used at all.
fCaptureParams.vKeyAbort = 0;
fCaptureParams.fAbortLeftMouse = false;
fCaptureParams.fAbortRightMouse = false;
fCaptureParams.fMakeUserHitOKToCapture = false;
fCaptureParams.fUsingDOSMemory = false;
// Configure the actual capture settings
capCaptureSetSetup(ref fCaptureParams);
}
protected bool capCaptureSetSetup(ref CAPTUREPARMS s)
{
uint wSize = (uint)Marshal.SizeOf(s);
return 1 == SendMessageW(fWindowHandle, Vfw.WM_CAP_SET_SEQUENCE_SETUP, wSize, ref s);
}