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我試圖創建一個directshow圖形來播放由8位灰度位圖組成的視頻。 (使用directshow.net。)directshow Renderstream失敗,灰度位圖
我正在使用源過濾器和vmr9渲染器。
源濾波器的輸出引腳使用以下代碼來定義:
bmi.Size = Marshal.SizeOf(typeof(BitmapInfoHeader));
bmi.Width = width;
bmi.Height = height;;
bmi.Planes = 1;
bmi.BitCount = (short)bitcount;
bmi.Compression = 0;
bmi.ImageSize = Math.Abs(bmi.Height) * bmi.Width * bmi.BitCount/8;
bmi.ClrUsed = bmi.BitCount <= 8 ? 256 : 0;
bmi.ClrImportant = 0;
//bmi.XPelsPerMeter = 0;
//bmi.YPelsPerMeter = 0;
bool isGrayScale = bmi.BitCount <= 8 ? true : false;
int formatSize = Marshal.SizeOf(typeof(BitmapInfoHeader));
if (isGrayScale == true)
{
MessageWriter.Log.WriteTrace("Playback is grayscale.");
/// Color table holds an array of 256 RGBQAD values
/// Those are relevant only for grayscale bitmaps
formatSize += Marshal.SizeOf(typeof(RGBQUAD)) * bmi.ClrUsed;
}
IntPtr ptr = Marshal.AllocHGlobal(formatSize);
Marshal.StructureToPtr(bmi, ptr, false);
if (isGrayScale == true)
{
/// Adjust the pointer to the beginning of the
/// ColorTable address and create the grayscale color table
IntPtr ptrNext = (IntPtr)((int)ptr + Marshal.SizeOf(typeof(BitmapInfoHeader)));
for (int i = 0; i < bmi.ClrUsed; i++)
{
RGBQUAD rgbCell = new RGBQUAD();
rgbCell.rgbBlue = rgbCell.rgbGreen = rgbCell.rgbRed = (byte)i;
rgbCell.rgbReserved = 0;
Marshal.StructureToPtr(rgbCell, ptrNext, false);
ptrNext = (IntPtr)((int)ptrNext + Marshal.SizeOf(typeof(RGBQUAD)));
}
}
這導致Renderstream返回「中間濾波器否組合可以發現進行連接」。
請幫忙!
謝謝。
我不明白...我創建了bitmapinfoheader以提供源過濾器的輸出引腳。 我在哪裏可以將它設置爲YUV,或者您提到的任何其他類型? – Roey 2010-06-13 11:02:14