Intelligent Screen Saver

namespace dshow.Core
{
	using System;
	using System.Runtime.InteropServices;

	// IMediaPosition interface
	//
	// Contains methods for seeking to a position within a stream
	//
	[ComImport,
	Guid("56A868B2-0AD4-11CE-B03A-0020AF0BA770"),
	InterfaceType(ComInterfaceType.InterfaceIsDual)]
	internal interface IMediaPosition
	{
		// Retrieves the duration of the stream
		[PreserveSig]
		int get_Duration(
			out double pLength);

		// Sets the current position, relative to the
		// total duration of the stream
		[PreserveSig]
		int put_CurrentPosition(
			double llTime);
		// Retrieves the current position, relative to the total
		// duration of the stream
		[PreserveSig]
		int get_CurrentPosition(
			out double pllTime);

		// Retrieves the time at which the playback will stop,
		// relative to the duration of the stream
		[PreserveSig]
		int get_StopTime(
			out double pllTime);
		// Sets the time at which the playback will stop,
		// relative to the duration of the stream
		[PreserveSig]
		int put_StopTime(
			double llTime);

		// Retrieves the amount of data that will be queued
		// before the start position
		[PreserveSig]
		int get_PrerollTime(
			out double pllTime);
		// Sets the amount of data that will be queued before
		// the start position
		[PreserveSig]
		int put_PrerollTime(
			double llTime);

		// Sets the playback rate
		[PreserveSig]
		int put_Rate(
			double dRate);
		// Retrieves the playback rate
		[PreserveSig]
		int get_Rate(
			out double pdRate);

		// Determines whether the filter graph can seek forward in the stream
		[PreserveSig]
		int CanSeekForward(
			[Out, MarshalAs(UnmanagedType.Bool)] out bool pCanSeekForward);

		// Determines whether the filter graph can seek backward in the stream
		[PreserveSig]
		int CanSeekBackward(
			[Out, MarshalAs(UnmanagedType.Bool)] out bool pCanSeekBackward);
	}
}