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DSGraphEdit: A Reasonable Facsimile of Microsoft's GraphEdit in .NET

, 19 Dec 2007
A library for adding DirectShow GraphEdit-like abilities to .NET applications.
dsgrapheditdemo.zip
dsgrapheditsrc.zip
DSGraphEdit
bin
Release
DSIcon.ico
Properties
Settings.settings
Referenced Libs
WeifenLuo.WinFormsUI.Docking.dll
RemoteGraphTile.jpg
DaggerLib
bin
Release
Core
Interfaces
Properties
SetGeneric
UI
DaggerLib.DSGraphEdit
DMOParameterControls
DSFilterTreeView
DSGraphEditControls
lib
Properties
ReferencedLibs
DirectShowLib-2005.dll
MediaFoundation.dll
DaggerLib.UI.Windows
AStar
bin
Debug
DaggerPropertyGrid
PropertyGridEx
Properties
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Runtime.InteropServices.ComTypes;
using DirectShowLib;

namespace DaggerLib.DSGraphEdit
{
    /// <summary>
    /// A class to hold information about a DirectShow filter registered on the system
    /// </summary>
    public class FilterData
    {
        public int Version;
        public int Merit;
        public int NumPins;
        public List<FilterDataPin> Pins = new List<FilterDataPin>();

        /// <summary>
        /// Constructor from an IMoniker
        /// </summary>
        /// <param name="m_Mon"></param>
        public FilterData(IMoniker m_Mon)
        {
            IPropertyBag bag = null;
            byte[] filterData = null;
            object bagObj = null;
            object val = null;

            try
            {
                Guid bagId = typeof(IPropertyBag).GUID;
                m_Mon.BindToStorage(null, null, ref bagId, out bagObj);
                bag = (IPropertyBag)bagObj;

                bag.Read("FilterData", out val, null);
                filterData = (byte[])val;
            }
            catch
            {
                filterData = null;
            }
            finally
            {
                bag = null;
                if (bagObj != null)
                {
                    Marshal.ReleaseComObject(bagObj);
                    bagObj = null;
                }
            }

            if (filterData != null)
            {
                // get the FilterData version and Merit
                Version = IntFromBytes(filterData, 0);
                Merit = IntFromBytes(filterData, 4);

                // Parse the pins
                NumPins = IntFromBytes(filterData, 8);
                int iPos = 16;
                for (int z = 0; z < NumPins; z++)
                {
                    int iMT = IntFromBytes(filterData, iPos + 12);
                    int iMedium = IntFromBytes(filterData, iPos + 16);
                    int flag = IntFromBytes(filterData, iPos + 4);
                    int inst = IntFromBytes(filterData, iPos + 8);
                    Guid cat = GuidFromOffset(filterData, iPos + 20);

                    FilterDataPin fdp = new FilterDataPin(z,flag,inst,cat);
                    iPos += 24;

                    // Parse the media types for the pin
                    for (int x = 0; x < iMT; x++)
                    {
                        fdp.Types.Add(new FilterDataPinType(x, GuidFromOffset(filterData, iPos + 8), GuidFromOffset(filterData, iPos + 12)));
                        iPos += 16;
                    }

                    // Parse the mediums for the pin
                    for (int y = 0; y < iMedium; y++)
                    {
                        fdp.Mediums.Add(new FilterDataPinType(y, GuidFromOffset(filterData, iPos), Guid.Empty));
                        iPos += 4;
                    }

                    Pins.Add(fdp);
                }
            }
        }

        static int IntFromBytes(byte[] b, int iOffset)
        {
            return (
            b[iOffset] +
            b[iOffset + 1] * 256 +
            b[iOffset + 2] * 256 * 256 +
            b[iOffset + 3] * 256 * 256 * 256
            );
        }

        static Guid GuidFromOffset(byte[] b, int iOffset)
        {
            Guid g;

            int iGuidOffset = IntFromBytes(b, iOffset);

            if (iGuidOffset > 0)
                g = GuidFromBytes(b, iGuidOffset);
            else
                g = new Guid();

            return g;
        }

        static Guid GuidFromBytes(byte[] b, int iOffset)
        {
            byte[] b2 = new byte[16];
            Array.Copy(b, iOffset, b2, 0, 16);

            Guid g = new Guid(b2);

            return g;
        }
    }

    /// <summary>
    /// Class to hold information about pins found in FilterData
    /// </summary>
    public class FilterDataPin
    {
        private int _flag;

        public int PinNumber;
        public int Inst;
        public Guid Category;
        public List<FilterDataPinType> Types = new List<FilterDataPinType>();
        public List<FilterDataPinType> Mediums = new List<FilterDataPinType>();

        public FilterDataPin(int pinNumber, int flag, int inst, Guid category)
        {
            PinNumber = pinNumber;
            _flag = flag;
            Inst = inst;
            Category = category;
        }

        /// <summary>
        /// Gets if the filter can have zero instances of this pin.
        /// </summary>
        public bool PinFlagZero
        {
            get
            {
                return (_flag & 0x1) == 0x1 ? true : false;
            }
        }

        /// <summary>
        /// Gets if the filter renders the input from this pin.
        /// </summary>
        public bool PinFlagRenderer
        {
            get
            {
                return (_flag & 0x2) == 0x2 ? true : false;
            }
        }

        /// <summary>
        /// Gets if the filter can create more than one instance of this pin.
        /// </summary>
        public bool PinFlagMany
        {
            get
            {
                return (_flag & 0x4) == 0x4 ? true : false;
            }
        }

        /// <summary>
        /// Gets if this pin is an output pin.
        /// </summary>
        public bool PinFlagOutput
        {
            get
            {
                return (_flag & 0x8) == 0x8 ? true : false;
            }
        }
    }

    public class FilterDataPinType
    {
        public int TypeNumber;
        public Guid MajorType;
        public Guid SubType;

        public FilterDataPinType(int number, Guid major, Guid minor)
        {
            TypeNumber = number;
            MajorType = major;
            SubType = minor;
        }
    }
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

JohnnyLocust
Software Developer (Senior) Haivision Network Video
United States United States
AKA Rich Insley.
 
I have over 25 years experience in programming, and I'm completely self taught. (Except for one year at California State University Fresno where I had to learn the God awful language Miranda (http://miranda.org.uk/). I've spent 10 years as a Paratrooper in the US Army during the Clinton Administration.
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