/// <summary>
/// Gets a copy of the current image being displayed by the video renderer.
/// </summary>
/// <param name="videoDisplayControl">A valid IMFVideoDisplayControl instance.</param>
/// <param name="bih">A BitmapInfoHeader class that receives a description of the bitmap. </param>
/// <param name="dib">Receives byte array that contains a packed Windows device-independent bitmap (DIB).</param>
/// <param name="timeStamp">Receives the time stamp of the captured image.</param>
/// <returns>If this function succeeds, it returns the S_OK member. Otherwise, it returns another HResult's member that describe the error.</returns>
public static HResult GetCurrentImage(this IMFVideoDisplayControl videoDisplayControl, BitmapInfoHeader bih, out byte[] dib, out TimeSpan timeStamp)
{
if (videoDisplayControl == null)
{
throw new ArgumentNullException("videoDisplayControl");
}
IntPtr dibPtr;
int dibLength;
long time;
HResult hr = videoDisplayControl.GetCurrentImage(bih, out dibPtr, out dibLength, out time);
if (hr.Succeeded())
{
try
{
dib = new byte[dibLength];
Marshal.Copy(dibPtr, dib, 0, dibLength);
timeStamp = TimeSpan.FromTicks(time);
}
finally
{
Marshal.FreeCoTaskMem(dibPtr);
}
}
else
{
dib = null;
timeStamp = TimeSpan.MinValue;
}
return(hr);
}
public override bool GetCurrentImage(out BITMAPINFOHEADER header, out IntPtr dibFull, out IntPtr dibDataOnly)
{
int cbDib;
long timestamp = 0;
header = new BITMAPINFOHEADER();
header.biSize = Marshal.SizeOf(typeof(BITMAPINFOHEADER));
int hr = _pMFVideoDisplayControl.GetCurrentImage(ref header, out dibFull, out cbDib, ref timestamp);
if (DsHlp.SUCCEEDED(hr))
{
dibDataOnly = new IntPtr(dibFull.ToInt64() + Marshal.SizeOf(typeof(BITMAPINFOHEADER)));
return(true);
}
else
{
dibDataOnly = IntPtr.Zero;
return(false);
}
}