imediacontrol.cs

摄像管理系统

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

	// IMediaControl interface
	//
	// The IMediaControl interface provides methods for controlling
	// the flow of data through the filter graph
	//
	[ComImport,
	Guid("56A868B1-0AD4-11CE-B03A-0020AF0BA770"),
	InterfaceType(ComInterfaceType.InterfaceIsDual)]
	public interface IMediaControl
	{
		// Switches the entire filter graph into running mode
		[PreserveSig]
		int Run();

		// Pauses all filters in the filter graph
		[PreserveSig]
		int Pause();

		// Switches all filters in the filter graph to a stopped state
		[PreserveSig]
		int Stop();

		// Retrieves the state of the filter graph
		[PreserveSig]
		int GetState(
			int msTimeout,
			out int pfs);

		// Adds and connects filters needed to play the specified file
		[PreserveSig]
		int RenderFile(
			string strFilename);

		// Adds to the graph the source filter that can read the given file name
		[PreserveSig]
		int AddSourceFilter(
			[In] string strFilename,
			[Out, MarshalAs(UnmanagedType.IDispatch)] out object ppUnk);

		//
		[PreserveSig]
		int get_FilterCollection(
			[Out, MarshalAs(UnmanagedType.IDispatch)] out object ppUnk);

		//
		[PreserveSig]
		int get_RegFilterCollection(
			[Out, MarshalAs(UnmanagedType.IDispatch)] out object ppUnk);

		// Waits for an operation such as Pause to complete,
		// allowing filters to queue up data, then stops the filter graph
		[PreserveSig]
		int StopWhenReady();
	}
}