如何使用DirectShow . NET捕获音频和视频

我正在努力学习c#。因为我已经知道OO PHP，一些Java和c++(我从来没有真正使用过，因为手动内存处理)我想我应该从一些有用的东西开始，而不是另一本充满人为问题的书。我在考虑简单的房屋监控。
我搜索了一下，找到了DirectShowNET。我在win7 64b上编译了它。编译了CaptureWMV样本，查看代码并尝试添加音频捕获12小时，但当我尝试使用不只是视频的编解码器时，它总是崩溃。我在谷歌上搜索了一些例子，但没有找到。(只有音频-是的，只有视频-是的，但两者都没有)这是我稍微修改的代码。我肯定在做蠢事，但如果有人给我指正确的方向，我会很高兴。

仔细查看

附近的注释代码

(…)AddSourceFilterForMoniker (devAudio.Mon(…)

这是错误的，我知道，但如何做它正确?

using System;
using System.Runtime.InteropServices;
using DirectShowLib;
namespace AsfFilter
{
    internal class Capture: IDisposable
    {
        #region Member variables
        /// <summary> graph builder interface. </summary>
        private IFilterGraph2 m_FilterGraph = null;
        IMediaControl m_mediaCtrl = null;
        /// <summary> Set by async routine when it captures an image </summary>
        private bool m_bRunning = false;
#if DEBUG
        DsROTEntry m_rot = null;
#endif
        #endregion
        /// <summary> release everything. </summary>
        public void Dispose()
        {
            GC.SuppressFinalize(this);
            CloseInterfaces();
        }
        ~Capture()
        {
            Dispose();
        }
        /// <summary>
        /// Create capture object
        /// </summary>
        /// <param name="iDeviceNum">Zero based index of capture device</param>
        /// <param name="szFileName">Output ASF file name</param>
        public Capture(int iDeviceNum, int iAudioNum,string szOutputFileName)
        {
            DsDevice [] capDevices;
            DsDevice [] audioCapDevices;
            // Get the collection of video devices
            capDevices = DsDevice.GetDevicesOfCat( FilterCategory.VideoInputDevice );
            audioCapDevices = DsDevice.GetDevicesOfCat(FilterCategory.AudioInputDevice);
            if (iDeviceNum + 1 > capDevices.Length)
            {
                throw new Exception("No video capture devices found at that index!");
            }
            if (iAudioNum + 1 > audioCapDevices.Length)
            {
                throw new Exception("No audio capture devices found at that index!");
            }
            try
            {
                // Set up the capture graph
                SetupGraph( capDevices[iDeviceNum], audioCapDevices[iDeviceNum], szOutputFileName);
                m_bRunning = false;
            }
            catch
            {
                Dispose();
                throw;
            }
        }
        // Start the capture graph
        public void Start()
        {
            if (!m_bRunning)
            {
                int hr = m_mediaCtrl.Run();
                Marshal.ThrowExceptionForHR( hr );
                m_bRunning = true;
            }
        }
        // Pause the capture graph.
        // Running the graph takes up a lot of resources.  Pause it when it
        // isn't needed.
        public void Pause()
        {
            if (m_bRunning)
            {
                IMediaControl mediaCtrl = m_FilterGraph as IMediaControl;
                int hr = mediaCtrl.Pause();
                Marshal.ThrowExceptionForHR( hr );
                m_bRunning = false;
            }
        }
        /// <summary> build the capture graph. </summary>
        private void SetupGraph(DsDevice dev, DsDevice devAudio, string szOutputFileName)
        {
            int hr;
            IBaseFilter capFilter = null;
            IBaseFilter asfWriter = null;
            IBaseFilter audFilter = null;
            ICaptureGraphBuilder2 capGraph = null;
            // Get the graphbuilder object
            m_FilterGraph = (IFilterGraph2)new FilterGraph();
#if DEBUG
            m_rot = new DsROTEntry( m_FilterGraph );
#endif
            try
            {
                // Get the ICaptureGraphBuilder2
                capGraph = (ICaptureGraphBuilder2) new CaptureGraphBuilder2();
                // Start building the graph
                hr = capGraph.SetFiltergraph( m_FilterGraph );
                Marshal.ThrowExceptionForHR( hr );
                // Add the capture device to the graph
                //hr = m_FilterGraph.AddSourceFilterForMoniker(devAudio.Mon, null, devAudio.Name, out capFilter);
                //Marshal.ThrowExceptionForHR(hr);
                hr = m_FilterGraph.AddSourceFilterForMoniker(dev.Mon, null, dev.Name, out capFilter);
                Marshal.ThrowExceptionForHR( hr );
                asfWriter = ConfigAsf(capGraph, szOutputFileName);
                hr = capGraph.RenderStream(null, null, capFilter, null, asfWriter);
                Marshal.ThrowExceptionForHR( hr );
                m_mediaCtrl = m_FilterGraph as IMediaControl;
            }
            finally
            {
                if (capFilter != null)
                {
                    Marshal.ReleaseComObject(capFilter);
                    capFilter = null;
                }
                if (asfWriter != null)
                {
                    Marshal.ReleaseComObject(asfWriter);
                    asfWriter = null;
                }
                if (capGraph != null)
                {
                    Marshal.ReleaseComObject(capGraph);
                    capGraph = null;
                }
            }
        }
        private IBaseFilter ConfigAsf(ICaptureGraphBuilder2 capGraph, string szOutputFileName)
        {
            IFileSinkFilter pTmpSink = null;
            IBaseFilter asfWriter = null;
            int hr = capGraph.SetOutputFileName( MediaSubType.Asf, szOutputFileName, out asfWriter, out pTmpSink);
            Marshal.ThrowExceptionForHR( hr );
            try
            {
                IConfigAsfWriter lConfig = asfWriter as IConfigAsfWriter;
                // Windows Media Video 8 for Dial-up Modem (No audio, 56 Kbps)
                // READ THE README for info about using guids
                //WMProfile_V80_56VideoOnly
                Guid cat = new Guid(0x6e2a6955, 0x81df, 0x4943, 0xba, 0x50, 0x68, 0xa9, 0x86, 0xa7, 0x8, 0xf6);
                //WMProfile_V80_BESTVBRVideo
                Guid bat = new Guid(0x48439ba, 0x309c, 0x440e, 0x9c, 0xb4, 0x3d, 0xcc, 0xa3, 0x75, 0x64, 0x23);
                //WMProfile_V80_288VideoOnly
                Guid vot = new Guid(0x8c45b4c7, 0x4aeb, 0x4f78, 0xa5, 0xec, 0x88, 0x42, 0xb, 0x9d, 0xad, 0xef);
                //WMProfile_V80_56Video
                Guid vau = new Guid(0x254E8A96, 0x2612, 0x405C, 0x80, 0x39, 0xf0, 0xBF, 0x72, 0x5C, 0xED, 0x7D);
                //WMProfile_V80_288MonoAudio
                Guid aon = new Guid(0x7ea3126d, 0xe1ba, 0x4716, 0x89, 0xaf, 0xf6, 0x5c, 0xee, 0xc, 0xc, 0x67);
                hr = lConfig.ConfigureFilterUsingProfileGuid(cat);
                //hr = lConfig.ConfigureFilterUsingProfileGuid(W288Video);
                Marshal.ThrowExceptionForHR( hr );
            }
            finally
            {
                Marshal.ReleaseComObject(pTmpSink);
            }
            return asfWriter;
        }
        /// <summary> Shut down capture </summary>
        private void CloseInterfaces()
        {
            int hr;
            try
            {
                if( m_mediaCtrl != null )
                {
                    // Stop the graph
                    hr = m_mediaCtrl.Stop();
                    m_bRunning = false;
                }
            }
            catch {}
#if DEBUG
            // Remove graph from the ROT
            if ( m_rot != null )
            {
                m_rot.Dispose();
                m_rot = null;
            }
#endif
            if (m_FilterGraph != null)
            {
                Marshal.ReleaseComObject(m_FilterGraph);
                m_FilterGraph = null;
            }
        }
    }
}

我不想使用c++代码，因为内存管理和DirectShowNet文档非常…简约。我真的不明白"别针"背后的意思。也许我必须完全放弃使用ICaptureGraphBuilder2，并尝试用困难的方式来做。

这是我第一次接触c# -请记住这一点!

Dim classEnum As IEnumMoniker = Nothing
Dim moniker As IMoniker() = New IMoniker(0) {}
Dim devEnum As ICreateDevEnum = CType(New CreateDevEnum, ICreateDevEnum)
hr = devEnum.CreateClassEnumerator(FilterCategory.VideoInputDevice, classEnum, 0)
Marshal.ReleaseComObject(devEnum)
If classEnum.Next(moniker.Length, moniker, IntPtr.Zero) = 0 Then
    Dim iid As Guid = GetType(IBaseFilter).GUID
    moniker(0).BindToObject(Nothing, Nothing, iid, source)
End If
sourceFilt = CType(source, IBaseFilter)
Dim classEnum2 As IEnumMoniker = Nothing
Dim moniker2 As IMoniker() = New IMoniker(0) {}
Dim devEnum2 As ICreateDevEnum = CType(New CreateDevEnum, ICreateDevEnum)
hr = devEnum2.CreateClassEnumerator(FilterCategory.AudioInputDevice, classEnum2, 0)
Marshal.ReleaseComObject(devEnum2)
If classEnum2.Next(moniker2.Length, moniker2, IntPtr.Zero) = 0 Then
    Dim iid As Guid = GetType(IBaseFilter).GUID
    moniker2(0).BindToObject(Nothing, Nothing, iid, sobject)
End If
aufilter = CType(sobject, IBaseFilter)