public void GetMainStreamSubtype(Action <AMMediaType> inspect)
{
var pPin = DsUtils.GetPin(_sourceFilter, PinDirection.Output, true);
if (pPin != null)
{
IEnumMediaTypes pEnumTypes;
var hr = pPin.EnumMediaTypes(out pEnumTypes);
if (hr == DsHlp.S_OK)
{
IntPtr ptr;
int cFetched;
if (pEnumTypes.Next(1, out ptr, out cFetched) == DsHlp.S_OK)
{
AMMediaType mt = (AMMediaType)Marshal.PtrToStructure(ptr, typeof(AMMediaType));
inspect(mt);
DsUtils.FreeFormatBlock(ptr);
Marshal.FreeCoTaskMem(ptr);
}
Marshal.ReleaseComObject(pEnumTypes);
}
Marshal.ReleaseComObject(pPin);
}
}
public static void InspectStream(this IAMStreamSelect pStreamSelect, int index, Action <AMMediaType, string, bool> inspect)
{
IntPtr ppmt;
AMStreamSelectInfoFlags pdwFlags;
int plcid;
int pdwGroup;
IntPtr ppszName;
IntPtr ppObject;
IntPtr ppUnk;
var hr = pStreamSelect.Info(index, out ppmt, out pdwFlags, out plcid, out pdwGroup, out ppszName, out ppObject, out ppUnk);
if (DsHlp.SUCCEEDED(hr))
{
var mt = ppmt != IntPtr.Zero ? (AMMediaType)Marshal.PtrToStructure(ppmt, typeof(AMMediaType)) : new AMMediaType();
var name = Marshal.PtrToStringAuto(ppszName);
var enabled = (pdwFlags & AMStreamSelectInfoFlags.Enabled) != AMStreamSelectInfoFlags.Disabled ||
(pdwFlags & AMStreamSelectInfoFlags.Exclusive) != AMStreamSelectInfoFlags.Disabled;
inspect(mt, name, enabled);
if (ppmt != IntPtr.Zero)
{
DsUtils.FreeFormatBlock(ppmt);
Marshal.FreeCoTaskMem(ppmt);
}
Marshal.FreeCoTaskMem(ppszName);
if (ppObject != IntPtr.Zero)
{
Marshal.Release(ppObject);
}
if (ppUnk != IntPtr.Zero)
{
Marshal.Release(ppUnk);
}
}
}
public static void EnumMediaTypes(this IPin pPin, Action <AMMediaType> action)
{
IEnumMediaTypes pEnumTypes;
var hr = pPin.EnumMediaTypes(out pEnumTypes);
if (hr == DsHlp.S_OK)
{
IntPtr ptr;
int cFetched;
if (pEnumTypes.Next(1, out ptr, out cFetched) == DsHlp.S_OK)
{
AMMediaType mt = (AMMediaType)Marshal.PtrToStructure(ptr, typeof(AMMediaType));
action(mt);
DsUtils.FreeFormatBlock(ptr);
Marshal.FreeCoTaskMem(ptr);
}
Marshal.ReleaseComObject(pEnumTypes);
}
}
