private static uint BitmapSize(BITMAPINFOHEADER bih)
{
uint bis = (uint)((((uint)bih.Width * (uint)bih.BitCount) + 31) & (~31)) / 8;
return((uint)((uint)bih.Height * bis));
}
private void GetOutPutCapability()
{
if (this.iamsc == null)
{
return;
}
int iCount = 0, iSize = 0;
VIDEO_STREAM_CONFIG_CAPS scc;
IntPtr ipscc = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(VIDEO_STREAM_CONFIG_CAPS)));
_AMMediaType mt, cmt;
IntPtr ipmt = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(_AMMediaType)));
IntPtr ipcmt = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(_AMMediaType)));
try
{
// clear output size list first
this.OutPutSizeList.Clear();
this.MediaTypeList.Clear();
this.cbxSize.Items.Clear();
iamsc.GetFormat(out ipmt);
cmt = (_AMMediaType)Marshal.PtrToStructure(ipmt, typeof(_AMMediaType));
iamsc.GetNumberOfCapabilities(out iCount, out iSize);
if (iSize == Marshal.SizeOf(typeof(VIDEO_STREAM_CONFIG_CAPS)))
{
for (int iFormat = 0; iFormat < iCount; iFormat++)
{
iamsc.GetStreamCaps(iFormat, out ipmt, ipscc);
mt = (_AMMediaType)Marshal.PtrToStructure(ipmt, typeof(_AMMediaType));
scc = (VIDEO_STREAM_CONFIG_CAPS)Marshal.PtrToStructure(ipscc, typeof(VIDEO_STREAM_CONFIG_CAPS));
if ((mt.majortype == cmt.majortype) &&
(mt.subtype == cmt.subtype) &&
(mt.formattype == cmt.formattype) &&
(mt.cbFormat >= Marshal.SizeOf(typeof(VIDEOINFOHEADER))) &&
(mt.pbFormat != null))
{
this.OutPutSizeList.Add(scc.MaxOutputSize);
VIDEOINFOHEADER vih = (VIDEOINFOHEADER)Marshal.PtrToStructure(mt.pbFormat,
typeof(VIDEOINFOHEADER));
BITMAPINFOHEADER bih = vih.BitmapInfo;
bih.Width = scc.MaxOutputSize.Width;
bih.Height = scc.MaxOutputSize.Height;
bih.SizeImage = BitmapSize(vih.BitmapInfo);
vih.BitmapInfo = bih;
this.MediaTypeList.Add(mt);
this.cbxSize.Items.Add(scc.MaxOutputSize.Width.ToString() + "x" + scc.MaxOutputSize.Height.ToString());
}
}
}
}
catch (Exception ex)
{
MessageBox.Show("Fail to get output size: " + ex.Message);
}
finally
{
if (ipcmt != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(ipcmt);
}
if (ipscc != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(ipscc);
}
if (ipmt != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(ipmt);
}
}
}