AnimatGuiCtrls.Video.Avi.AVIStreamGetFrameOpen C# (CSharp) Method

        public static extern int AVIStreamGetFrameOpen(
            IntPtr pAVIStream,
            ref BITMAPINFOHEADER bih);

        /// <summary>Prepare for decompressing frames</summary>
        /// <remarks>
        /// This method has to be called before GetBitmap and ExportBitmap.
        /// Release ressources with GetFrameClose.
        /// </remarks>
        public void GetFrameOpen()
        {
            Avi.AVISTREAMINFO streamInfo = GetStreamInfo(StreamPointer);

            //Open frames

            Avi.BITMAPINFOHEADER bih = new Avi.BITMAPINFOHEADER();
            bih.biBitCount      = countBitsPerPixel;
            bih.biClrImportant  = 0;
            bih.biClrUsed       = 0;
            bih.biCompression   = 0;
            bih.biPlanes        = 1;
            bih.biSize          = Marshal.SizeOf(bih);
            bih.biXPelsPerMeter = 0;
            bih.biYPelsPerMeter = 0;

            // Corrections by M. Covington:
            // If these are pre-set, interlaced video is not handled correctly.
            // Better to give zeroes and let Windows fill them in.
            bih.biHeight = 0;            // was (Int32)streamInfo.rcFrame.bottom;
            bih.biWidth  = 0;            // was (Int32)streamInfo.rcFrame.right;

            // Corrections by M. Covington:
            // Validate the bit count, because some AVI files give a bit count
            // that is not one of the allowed values in a BitmapInfoHeader.
            // Here 0 means for Windows to figure it out from other information.
            if (bih.biBitCount > 24)
            {
                bih.biBitCount = 32;
            }
            else if (bih.biBitCount > 16)
            {
                bih.biBitCount = 24;
            }
            else if (bih.biBitCount > 8)
            {
                bih.biBitCount = 16;
            }
            else if (bih.biBitCount > 4)
            {
                bih.biBitCount = 8;
            }
            else if (bih.biBitCount > 0)
            {
                bih.biBitCount = 4;
            }

            getFrameObject = Avi.AVIStreamGetFrameOpen(StreamPointer, ref bih);

            if (getFrameObject == 0)
            {
                throw new Exception("Exception in VideoStreamGetFrameOpen!");
            }
        }