private void ConfigureMediaWriter(int width, int height, Guid mediaSubType, short bitCount)
{
AMMediaType mediaType = new AMMediaType();
VideoInfoHeader videoInfo = new VideoInfoHeader();
// Create the VideoInfoHeader using info from the bitmap
videoInfo.BmiHeader.Size = Marshal.SizeOf(typeof(BitmapInfoHeader));
videoInfo.BmiHeader.Width = width;
videoInfo.BmiHeader.Height = height;
videoInfo.BmiHeader.Planes = 1;
// compression thru clrimportant don't seem to be used. Init them anyway
videoInfo.BmiHeader.Compression = 0;
videoInfo.BmiHeader.ImageSize = 0;
videoInfo.BmiHeader.XPelsPerMeter = 0;
videoInfo.BmiHeader.YPelsPerMeter = 0;
videoInfo.BmiHeader.ClrUsed = 0;
videoInfo.BmiHeader.ClrImportant = 0;
mediaType.subType = mediaSubType;
videoInfo.BmiHeader.BitCount = bitCount;
videoInfo.SrcRect = new Rectangle(0, 0, width, height);
videoInfo.TargetRect = videoInfo.SrcRect;
videoInfo.BmiHeader.ImageSize = width * height * (videoInfo.BmiHeader.BitCount / 8);
videoInfo.BitRate = videoInfo.BmiHeader.ImageSize * Constants.VideoFrameRate;
videoInfo.BitErrorRate = 0;
videoInfo.AvgTimePerFrame = 10000 * 1000 / Constants.VideoFrameRate;
mediaType.majorType = MediaType.Video;
mediaType.fixedSizeSamples = true;
mediaType.temporalCompression = false;
mediaType.sampleSize = videoInfo.BmiHeader.ImageSize;
mediaType.formatType = FormatType.VideoInfo;
mediaType.unkPtr = IntPtr.Zero;
mediaType.formatSize = Marshal.SizeOf(typeof(VideoInfoHeader));
// Lock the videoInfo structure, and put the pointer
// into the mediatype structure
GCHandle handle = GCHandle.Alloc(videoInfo, GCHandleType.Pinned);
try
{
// Set the inputprops using the structures
mediaType.formatPtr = handle.AddrOfPinnedObject();
MediaProperties.SetMediaType(mediaType);
}
finally
{
handle.Free();
mediaType.formatPtr = IntPtr.Zero;
}
// Now take the inputprops, and set them on the file writer
MediaWriter.SetInputProps(VideoChannelIndex, MediaProperties);
}
