Leadtools.Multimedia Namespace > TargetFormat Class : GetCacheObject Method |
public object GetCacheObject( TargetFormatObject ObjType )
'Declaration Public Function GetCacheObject( _ ByVal ObjType As TargetFormatObject _ ) As Object
'Usage Dim instance As TargetFormat Dim ObjType As TargetFormatObject Dim value As Object value = instance.GetCacheObject(ObjType)
public object GetCacheObject( TargetFormatObject ObjType )
function Leadtools.Multimedia.TargetFormat.GetCacheObject( ObjType )
public: Object^ GetCacheObject( TargetFormatObject ObjType )
Public _result As Boolean = False Public _form As CaptureCtrlForm = New CaptureCtrlForm() Public _pMpgMux As LMMpg2MxTLib.LMMpg2MxT ' This example will show you the correct way to set up a muxer's properties during capture ' Normally, the muxer is added only after the capture graph has been build with ReadyCapture or StartCapture ' But at this point, the graph is in running mode, so some muxer operations might fail ' If you need to make changes to the muxer in stopped state (like adding KLV data stream, for example), ' then you need to change the muxer before the graph is fully built. You can do so by instructing the toolkit ' to cache the target filters by setting the the TargetFormat.UseFilterCache property to true ' In this situation, the filters used to implement a certain target format are created and used whenever ' you set that target format. ' This example will show you how to add KLV data to a MPEG-2 Transport Stream in a capture situation. Public Sub UseFilterCacheExample() ' reference the capture control Dim capturectrl As CaptureCtrl = _form.CaptureCtrl Dim outFile As String = Path.Combine(LEAD_VARS.MediaDir, "CaptureKLV.mpg") Try ' select the capture device capturectrl.VideoDevices.Selection = 0 ' Use a different video device if you want ' capturectrl.Preview = true; -- enable this if you want ' set the video compressor (only if the capture device is not already capturing compressed video) capturectrl.VideoCompressors.Mpeg2.Selected = True ' set the target output file capturectrl.TargetFile = outFile ' subscribe to the compete event AddHandler capturectrl.Started, AddressOf CaptureCtrl_Started ' just 10 seconds of capture time capturectrl.TimeLimit = 10 capturectrl.UseTimeLimit = True ' subscribe to the compete event AddHandler capturectrl.Complete, AddressOf CaptureCtrl_Complete ' IN a capture situation 'in order to get the mux in a capture situation, set the UseFilterCache property for the target format to TRUE ' This tells the toolkit to create a Mux object and keep it around when building or rebuilding graphs capturectrl.TargetFormats(Leadtools.Multimedia.TargetFormatType.MPEG2Transport).UseFilterCache = True capturectrl.TargetFormat = Leadtools.Multimedia.TargetFormatType.MPEG2Transport _pMpgMux = DirectCast(capturectrl.TargetFormats(Leadtools.Multimedia.TargetFormatType.MPEG2Transport).GetCacheObject(TargetFormatObject.Mux), LMMpg2MxTLib.LMMpg2MxT) If _pMpgMux IsNot Nothing Then _pMpgMux.PrivateDataPID = &H70 _pMpgMux.PrivateDataFormatID = &H41564C4B _pMpgMux.EnablePrivateData = True End If ' start capture capturectrl.StartCapture(Leadtools.Multimedia.CaptureMode.Video) Catch generatedExceptionName As Exception _result = False End Try End Sub Private Sub WriteKLVData(ByVal pMpgMux As LMMpg2MxTLib.LMMpg2MxT) ' get the current time since Jan 1, 1970 Dim basetime As TimeSpan = DateTime.UtcNow - New DateTime(1970, 1, 1, 0, 0, 0) ' get the number of microseconds since Jan 1, 1970 Dim timestamp As Int64 = CLng(basetime.TotalSeconds) * 1000000 ' don't really need to do this, since I am writing only one item pMpgMux.KlvBuilder.Clear() ' write the UDS timestamp (number of microseconds since Jan 1, 1970) pMpgMux.KlvBuilder.InsertUInt64(-1, "06 0E 2B 34 01 01 01 03 07 02 01 01 01 05 00 00", CULng(timestamp)) ' write one KLV data at the beginning pMpgMux.WritePrivateData(CInt(LMMpg2MxTLib.Mpg2MxT_WriteFlags.Mpg2MxT_WriteFlag_PTSValid) _ Or CInt(LMMpg2MxTLib.Mpg2MxT_WriteFlags.Mpg2MxT_WriteFlag_PTSInSeconds), _ 0.0, pMpgMux.KlvBuilder.GetData(), -1) ' close the stream pMpgMux.ClosePrivateData() End Sub Public Sub CaptureCtrl_Started(ByVal sender As Object, ByVal e As EventArgs) WriteKLVData(_pMpgMux) End Sub Public Sub CaptureCtrl_Complete(ByVal sender As Object, ByVal e As EventArgs) ' set result _result = True End Sub Public NotInheritable Class LEAD_VARS Public Const MediaDir As String = "C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 175\Media"; End Class
public bool _result = false; public CaptureCtrlForm _form = new CaptureCtrlForm(); public LMMpg2MxTLib.LMMpg2MxT _pMpgMux; // This example will show you the correct way to set up a muxer's properties during capture // Normally, the muxer is added only after the capture graph has been build with ReadyCapture or StartCapture // But at this point, the graph is in running mode, so some muxer operations might fail // If you need to make changes to the muxer in stopped state (like adding KLV data stream, for example), // then you need to change the muxer before the graph is fully built. You can do so by instructing the toolkit // to cache the target filters by setting the the TargetFormat.UseFilterCache property to true // In this situation, the filters used to implement a certain target format are created and used whenever // you set that target format. // // This example will show you how to add KLV data to a MPEG-2 Transport Stream in a capture situation. public void UseFilterCacheExample() { // reference the capture control CaptureCtrl capturectrl = _form.CaptureCtrl; string outFile = Path.Combine(LEAD_VARS.MediaDir, "CaptureKLV.mpg"); try { // select the capture device capturectrl.VideoDevices.Selection = 0; /* Use a different video device if you want */ /* capturectrl.Preview = true; -- enable this if you want */ /* set the video compressor (only if the capture device is not already capturing compressed video) */ capturectrl.VideoCompressors.Mpeg2.Selected = true; // set the target output file capturectrl.TargetFile = outFile; // subscribe to the started event capturectrl.Started += new System.EventHandler(this.CaptureCtrl_Started); // just 10 seconds of capture time capturectrl.TimeLimit = 10; capturectrl.UseTimeLimit = true; // subscribe to the complete event capturectrl.Complete += new EventHandler(CaptureCtrl_Complete); // IN a capture situation //in order to get the mux in a capture situation, set the UseFilterCache property for the target format to TRUE // This tells the toolkit to create a Mux object and keep it around when building or rebuilding graphs capturectrl.TargetFormats[Leadtools.Multimedia.TargetFormatType.MPEG2Transport].UseFilterCache = true; capturectrl.TargetFormat = Leadtools.Multimedia.TargetFormatType.MPEG2Transport; _pMpgMux = (LMMpg2MxTLib.LMMpg2MxT)capturectrl.TargetFormats[Leadtools.Multimedia.TargetFormatType.MPEG2Transport].GetCacheObject(TargetFormatObject.Mux); if (_pMpgMux != null) { _pMpgMux.PrivateDataPID = 0x70; _pMpgMux.PrivateDataFormatID = 0x41564c4b; _pMpgMux.EnablePrivateData = true; } // start capture capturectrl.StartCapture(Leadtools.Multimedia.CaptureMode.Video); } catch (Exception) { _result = false; } } private void WriteKLVData(LMMpg2MxTLib.LMMpg2MxT pMpgMux) { // get the current time since Jan 1, 1970 TimeSpan basetime = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0); // get the number of microseconds since Jan 1, 1970 Int64 timestamp = (Int64)basetime.TotalSeconds * 1000000; // do not really need to do this, since I am writing only one item pMpgMux.KlvBuilder.Clear(); // write the UDS timestamp (number of microseconds since Jan 1, 1970) pMpgMux.KlvBuilder.InsertUInt64(-1, "06 0E 2B 34 01 01 01 03 07 02 01 01 01 05 00 00", (ulong)timestamp); // write one KLV data at the beginning pMpgMux.WritePrivateData((int)LMMpg2MxTLib.Mpg2MxT_WriteFlags.Mpg2MxT_WriteFlag_PTSValid | (int)LMMpg2MxTLib.Mpg2MxT_WriteFlags.Mpg2MxT_WriteFlag_PTSInSeconds, 0.0, pMpgMux.KlvBuilder.GetData(), -1); // close the stream pMpgMux.ClosePrivateData(); } private void CaptureCtrl_Started(object sender, EventArgs e) { WriteKLVData(_pMpgMux); } private void CaptureCtrl_Complete(object sender, EventArgs e) { // set result _result = true; } static class LEAD_VARS { public const string MediaDir = @"C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 175\Media"; }
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2