Testcap DDK sample and I420 stream format

hi all,

I try to modify stream format in Testcap DDK sample from UYU2 to I420, but
seem Testcap work incorrect on preview bin on some chat program.
Seem stream format and data buffer not match, i try to debug and see : width
= 320, height = 240, bitcount = 24, but display incorrect, seem it display
I420, not RGB24

Following is my change:

#define FCC_FORMAT_YUV12A mmioFOURCC('I','4','2','0')

static KS_DATARANGE_VIDEO StreamFormatUYU2_Capture =
{
// KSDATARANGE
{
sizeof (KS_DATARANGE_VIDEO), // FormatSize
0, // Flags
(D_X * D_Y * 12)/8, // SampleSize
0, // Reserved
//MEDIATYPE_Video
STATIC_KSDATAFORMAT_TYPE_VIDEO, // aka. MEDIATYPE_Video
//MEDIASUBTYPE_I420
//0x59565955, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38,
0x9b, 0x71, //MEDIASUBTYPE_UYVY,
FCC_FORMAT_YUV12A, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38,
0x9b, 0x71,
STATIC_KSDATAFORMAT_SPECIFIER_VIDEOINFO // aka. FORMAT_VideoInfo
},

TRUE, // BOOL, bFixedSizeSamples (all samples same size?)
TRUE, // BOOL, bTemporalCompression (all I frames?)
0, // Reserved (was StreamDescriptionFlags)
0, // Reserved (was MemoryAllocationFlags
(KS_VIDEO_ALLOC_*))

// _KS_VIDEO_STREAM_CONFIG_CAPS
{
STATIC_KSDATAFORMAT_SPECIFIER_VIDEOINFO, // GUID
KS_AnalogVideo_NTSC_M |
KS_AnalogVideo_PAL_B, // AnalogVideoStandard
720,480, // InputSize, (the inherent size of the incoming
signal
// with every digitized pixel unique)
160,120, // MinCroppingSize, smallest rcSrc cropping rect
allowed
720,480, // MaxCroppingSize, largest rcSrc cropping rect
allowed
1, // CropGranularityX, granularity of cropping size
1, // CropGranularityY
1, // CropAlignX, alignment of cropping rect
1, // CropAlignY;
160, 120, // MinOutputSize, smallest bitmap stream can produce
720, 480, // MaxOutputSize, largest bitmap stream can produce
1, // OutputGranularityX, granularity of output bitmap
size
1, // OutputGranularityY;
0, // StretchTapsX (0 no stretch, 1 pix dup, 2
interp...)
0, // StretchTapsY
0, // ShrinkTapsX
0, // ShrinkTapsY
333667, // MinFrameInterval, 100 nS units
640000000, // MaxFrameInterval, 100 nS units
(8 * 12 * 30 * 160 * 120)/8, // MinBitsPerSecond;
(8 * 12 * 30 * 720 * 480)/8 // MaxBitsPerSecond;
},

// KS_VIDEOINFOHEADER (default format)
{
0,0,0,0, // RECT rcSource;
0,0,0,0, // RECT rcTarget;
(D_X * D_Y * 12 * 30)/8, // DWORD dwBitRate;
0L, // DWORD dwBitErrorRate;
333667, // REFERENCE_TIME
AvgTimePerFrame;

sizeof (KS_BITMAPINFOHEADER), // DWORD biSize;
D_X, // LONG biWidth;
D_Y, // LONG biHeight;
1, // WORD biPlanes;
12, // WORD biBitCount;
FCC_FORMAT_YUV12A, // DWORD biCompression;
(D_X * D_Y * 12)/8, // DWORD biSizeImage;
0, // LONG biXPelsPerMeter;
0, // LONG biYPelsPerMeter;
0, // DWORD biClrUsed;
0 // DWORD biClrImportant;
}
};

Any advance why it can not work, pls help me?
Thanks very much,