In This Topic ▼

GetPortableType Method

Summary

Gets a portable version of the media type.

Syntax

C++/CLI

public byte[] GetPortableType()

public: 
array<byte>^ GetPortableType();

Return Value

An byte array representing the portable media type, usable by other media samples.

Remarks

Use this high level method to retrieve the media type in a flat format that can be transported across networks. The portable type contains all the data needed to fully reconstruct the media type. After the media type has been obtained by calling this method, use it to set the media type for other objects by calling the SetPortableType method. Only data retrieved using the GetPortableType method should be passed to the SetPortableType method. These two methods make it possible to obtain a media type from one sample and use that media type to set another sample. If the method fails, an error is raised. For more information, refer to the Error Codes.

Example

using Leadtools; 
using Leadtools.Multimedia; 
using LeadtoolsMultimediaExamples.Fixtures; 
 
 
public bool _result = false; 
public CaptureAndPlayCtrlForm _form = new CaptureAndPlayCtrlForm(); 
public SampleTarget _captureTarget; 
public SampleSource _playSource; 
 
public void GetPortableTypeExample() 
{ 
   // reference the convert control 
   CaptureCtrl capturectrl = _form.CaptureCtrl; 
   PlayCtrl playctrl = _form.PlayCtrl; 
 
   // This example demonstrates how to play a capture stream  
   // using a play control and portable media types. 
 
   try 
   { 
      // set the source device 
      if (capturectrl.VideoDevices["USB"] == null) 
         throw new Exception("No USB video devices available!"); 
 
      capturectrl.VideoDevices["USB"].Selected = true; 
 
      // set the preview 
      capturectrl.Preview = true; 
 
      // create a sample target object for the capture control 
      _captureTarget = new SampleTarget(); 
 
      // set the capture target to our sample target created earlier 
      capturectrl.TargetObject = _captureTarget; 
 
      // create a new sample source object for the play control 
      _playSource = new SampleSource(); 
 
      // set the video compressor  
      capturectrl.VideoCompressors.MCmpMJpeg.Selected = true; 
 
      //// for this example we will only capture 120 seconds of video 
      capturectrl.UseTimeLimit = true; 
      capturectrl.TimeLimit = 120; 
 
      // start the capture 
      capturectrl.StartCapture(CaptureMode.Video); 
 
      // we could just assign the media type from target to source 
      // however, let's use the portable type to simulate 
      // the needed steps for remote playback 
      Byte[] portableMediaType = _captureTarget.GetConnectedMediaType().GetPortableType(); 
 
      // initialize a new media type object with the portable type 
      MediaType mt = new MediaType(); 
      mt.SetPortableType(portableMediaType); 
 
      // set the sample source media type 
      _playSource.SetMediaType(mt); 
 
      // set the play controls sample source object 
      playctrl.SourceObject = _playSource; 
 
      // create a timer to drive the sample delivery 
      _form.TestTimer.Tick += new EventHandler(SampleDeliver_Tick); 
      _form.TestTimer.Interval = 33; 
      _form.TestTimer.Start(); 
 
      // we'll loop on the state and pump messages for this example. 
      // but you should not need to if running from a Windows Forms application. 
      while (capturectrl.State == CaptureState.Running 
         || capturectrl.State == CaptureState.Paused 
         || capturectrl.State == CaptureState.Pending) 
         Application.DoEvents(); 
   } 
   catch (Exception) 
   { 
      _result = false; 
   } 
} 
 
void SampleDeliver_Tick(object sender, EventArgs e) 
{ 
   _form.TestTimer.Stop(); 
 
   bool eos = false; 
   MediaSample cs = null; 
 
   try 
   { 
      cs = _captureTarget.GetSample(1000); 
   } 
   catch (COMException cex) 
   { 
      if (cex.ErrorCode == (int)ErrorCode.VFW_E_SAMPLE_REJECTED_EOS) 
         eos = true; 
      else 
         throw; 
   } 
   catch (Exception ex) 
   { 
      throw new Exception(ex.Message); 
   } 
 
   if (!eos) 
   { 
      _playSource.DeliverSample(1000, cs); 
      _form.TestTimer.Start(); 
   } 
   else 
   { 
      _playSource.DeliverEndOfStream(1000); 
      _form.TestTimer.Stop(); 
 
      // set the result 
      _result = true; 
   } 
}

Requirements

Target Platforms

Reference

MediaType Class

MediaType Members

Download our FREE evaluation

Help Version 23.0.2024.2.29

Leadtools.Multimedia Assembly

Introduction

Getting Started

Namespaces

Leadtools.Multimedia Namespace

Leadtools.Multimedia.Common Namespace

Assemblies