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UseFilterCache Property

Summary

Gets or sets a value that determines whether the toolkit is currently caching filters.

Syntax

C++/CLI

public bool UseFilterCache { get; set; }

public: 
property bool UseFilterCache { 
   bool get(); 
   void set (    bool ); 
}

Property Value

true to enable caching filters; otherwise, it is false to disable caching filters. The default value is false.

Remarks

Setting this property to true will enable caching for the current target format object. The target format object is the format that will be used for the converted file. This includes the file format, any special settings used by the format, which audio/video codec is used for the conversion and any special settings used by the codec. Additionally, setting this property to true will force the toolkit to preload and reuse the filters specified for the particular format. If an object isn't currently created, one will be created. Setting the value of this property to false will disable the caching for the current target format object. If an object currently exists, it will destroy it.

Use the TargetFormat.GetCacheObject method to retrieve the caching filter object. Use the TargetFormat.ShowCacheDialog method to display a specific property dialog for the caching filter.

Use the TargetFormat.HasCacheDialog method to query whether the specified property dialog for the caching filter is available.

Example

using Leadtools; 
using Leadtools.Multimedia; 
using LeadtoolsMultimediaExamples.Fixtures; 
 
 
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 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); 
      _result = true; 
   } 
   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:\LEADTOOLS22\Media"; 
}

Requirements

Target Platforms

Reference

TargetFormat Class

TargetFormat Members

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Help Version 22.0.2022.12.7

Leadtools.Multimedia Assembly

Introduction

Getting Started

Namespaces

Leadtools.Multimedia Namespace

Leadtools.Multimedia.Common Namespace

Assemblies