NewTOAPIA.DirectShow.VideoCaptureDevice.ConfigureSourceFilter C# (CSharp) Method

        private void ConfigureSourceFilter(IAMStreamConfig streamConfig, int iWidth, int iHeight, short bitsPerPixel)
        {
            int hr;
            AMMediaType mType = new AMMediaType();
            VIDEOINFOHEADER v;

            // First, we need to get the existing format block
            // If there's an error, throw an exception.
            hr = streamConfig.GetFormat(out mType);
            DsError.ThrowExceptionForHR(hr);

            // Return early if the media type is not what we expect
            // First, the majorType must be 'Video'
            // Second, the size of the format structure must be sizeof(VIDEOINFOHEADER)
            if ((MediaType.Video != mType.majorType) || 
                (mType.formatSize != Marshal.SizeOf(typeof(VIDEOINFOHEADER))))
                return;

            try
            {
                // The formatPtr member of the AMMediaType object points
                // to a chunk of unmanaged memory that contains the data
                // for the format structure.  We need to copy this data 
                // into a structure object so we can manipulate it.
                v = new VIDEOINFOHEADER();
                Marshal.PtrToStructure(mType.formatPtr, v);

                // In order to change the size and bits per pixel, we
                // need to change the values of the VIDEOINFOHEADER object
                // that we pulled out from the AMMediaType object.
                if (iWidth > 0)
                {
                    v.BmiHeader.biWidth = iWidth;
                }

                if (iHeight > 0)
                {
                    v.BmiHeader.biHeight = iHeight;
                }

                if (bitsPerPixel > 0)
                {
                    v.BmiHeader.biBitCount = (ushort)bitsPerPixel;
                }

                // Now we copy the VIDEOINFOHEADER structure back into 
                // a piece of unmanaged memory and give the pointer to 
                // the AMMediaType structure.
                Marshal.StructureToPtr(v, mType.formatPtr, false);

                // Finally, we set the new format on the pin
                hr = streamConfig.SetFormat(mType);
                DsError.ThrowExceptionForHR(hr);
            }
            finally
            {
                mType.Dispose();
            }
        }