public static ComObject <T> GetServiceForStream <T>(this IMFSinkWriter input, uint streamIndex, Guid serviceId, Guid interfaceId)
{
if (input == null)
{
throw new ArgumentNullException(nameof(input));
}
if (input.GetServiceForStream(streamIndex, serviceId, interfaceId, out var ppv).IsError)
{
return(null);
}
return(new ComObject <T>((T)ppv));
}
/// <summary>
/// Queries the underlying media sink or encoder for an interface.
/// </summary>
/// <typeparam name="T">The COM interface being requested.</typeparam>
/// <param name="sinkWriter">A valid IMFSinkWriter instance.</param>
/// <param name="streamIndex">The zero-based index of a streamIndex to query or -1 to query the media sink itself.</param>
/// <param name="guidService">A service identifier GUID.</param>
/// <param name="service">Receives an instance of the requested interface.</param>
/// <returns>If this function succeeds, it returns the S_OK member. Otherwise, it returns another HResult's member that describe the error.</returns>
public static HResult GetServiceForStream <T>(this IMFSinkWriter sinkWriter, int streamIndex, Guid guidService, out T service) where T : class
{
if (sinkWriter == null)
{
throw new ArgumentNullException("sinkWriter");
}
Type typeOfT = typeof(T);
if (!typeOfT.IsInterface)
{
throw new ArgumentOutOfRangeException("T", "T must be a COM visible interface.");
}
object tmp;
HResult hr = sinkWriter.GetServiceForStream(streamIndex, guidService, typeOfT.GUID, out tmp);
service = hr.Succeeded() ? tmp as T : null;
return(hr);
}
