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Rate Property

Summary

Gets or sets the rate of playback relative to normal playback speed.

Syntax

C++

public virtual double Rate { get; set; }

Public Overridable Property Rate As Double

public: 
virtual property double Rate { 
   double get(); 
   void set (    double ); 
}

Property Value

A value representing the relative playback rate.

Remarks

A rate of 1.0 indicates normal playback speed. A rate of 0.5 indicates half speed.

Example

using Leadtools; 
using Leadtools.MediaFoundation; 
using LeadtoolsMediaFoundationExamples.Fixtures; 
 
public bool _result = false; 
public PlayCtrlForm _form = new PlayCtrlForm(); 
double _duration = 0.0; 
double _currentPos = -1; 
 
public void PlayExample() 
{ 
   // reference the play control 
   PlayCtrl playctrl = _form.PlayCtrl; 
 
   // input file 
   string inFile = Path.Combine(LEAD_VARS.MediaDir, "PlayCtrl_Source.avi"); 
 
   try 
   { 
      // set autostart to false 
      playctrl.AutoStart = false; 
 
      // set the play count to 2 
      playctrl.PlayCount = 2; 
 
      // set our source media file 
      playctrl.SourceFile = inFile; 
 
      // get the reported duration 
      _duration = playctrl.Duration; 
 
      // set the playback rate to 2x 
      if (playctrl.IsRateSupported(2.0)) 
         playctrl.Rate = 2.0; 
 
      // set event handler to get tracking position changes 
      playctrl.TrackingPositionChanged += new TrackingPositionChangedEventHandler(PlayCtrl_TrackingPositionChanged); 
 
      // run it! 
      playctrl.Run(); 
   } 
   catch (Exception) 
   { 
      _result = false; 
   } 
 
   // 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 (playctrl.State == PlayState.Running) 
      Application.DoEvents(); 
 
   // set the result to determine if the reported duration 
   // is the same as the final position from tracking 
   _result = (_duration == _currentPos && _duration > 0.0); 
} 
 
void PlayCtrl_TrackingPositionChanged(object sender, TrackingPositionChangedEventArgs e) 
{ 
   // get the frame and tracking positions for demonstration only 
   int frame = _form.PlayCtrl.CurrentFramePosition; 
   int tracking = _form.PlayCtrl.CurrentTrackingPosition; 
 
   // get the current position 
   _currentPos = Math.Max(_currentPos, _form.PlayCtrl.CurrentPosition); 
} 
 
static class LEAD_VARS 
{ 
   public const string MediaDir = @"C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 20\Media"; 
}

Imports Leadtools 
Imports Leadtools.MediaFoundation 
Imports LeadtoolsMediaFoundationExamples.Fixtures 
 
Public _result As Boolean = False 
Public _form As PlayCtrlForm = New PlayCtrlForm() 
Private _duration As Double = 0.0 
Private _currentPos As Double = -1 
 
Public Sub PlayExample() 
   ' reference the play control 
   Dim playctrl As PlayCtrl = _form.PlayCtrl 
 
   ' input file 
   Dim inFile As String = Path.Combine(LEAD_VARS.MediaDir, "PlayCtrl_Source.avi") 
 
   Try 
      ' set autostart to false 
      playctrl.AutoStart = False 
 
      ' set the play count to 2 
      playctrl.PlayCount = 2 
 
      ' set our source media file 
      playctrl.SourceFile = inFile 
 
      ' get the reported duration 
      _duration = playctrl.Duration 
 
      ' set the playback rate to 2x 
      If playctrl.IsRateSupported(2.0) Then 
         playctrl.Rate = 2.0 
      End If 
 
      ' set event handler to get tracking position changes 
      AddHandler playctrl.TrackingPositionChanged, AddressOf PlayCtrl_TrackingPositionChanged 
 
      ' run it! 
      playctrl.Run() 
   Catch e1 As Exception 
      _result = False 
   End Try 
 
   ' 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. 
   Do While playctrl.State = PlayState.Running 
      Application.DoEvents() 
   Loop 
 
   ' set the result to determine if the reported duration 
   ' is the same as the final position from tracking 
   _result = (_duration = _currentPos AndAlso _duration > 0.0) 
End Sub 
 
Private Sub PlayCtrl_TrackingPositionChanged(ByVal sender As Object, ByVal e As TrackingPositionChangedEventArgs) 
   ' get the frame and tracking positions for demonstration only 
   Dim frame As Integer = _form.PlayCtrl.CurrentFramePosition 
   Dim tracking As Integer = _form.PlayCtrl.CurrentTrackingPosition 
 
   ' get the current position 
   _currentPos = Math.Max(_currentPos, _form.PlayCtrl.CurrentPosition) 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const MediaDir As String = "C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 20\Media" 
End Class

Requirements

Target Platforms

Reference

PlayCtrl Class

PlayCtrl Members

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Help Version 20.0.2020.4.2

Leadtools.MediaFoundation Assembly

Introduction

Getting Started

Namespaces

Leadtools.MediaFoundation Namespace

Leadtools.MediaFoundation.Common Namespace

Assemblies