IsRateSupported Method

Visual Basic
C#
C++/CLI

'Declaration
 
Public Overridable Function IsRateSupported( _
   ByVal rate As Double _
) As Boolean

'Usage
 
Dim instance As PlayCtrl
Dim rate As Double
Dim value As Boolean
 
value = instance.IsRateSupported(rate)

public virtual bool IsRateSupported( 
   double rate
)

public:
virtual bool IsRateSupported( 
   double rate
)

Parameters

rate: The playback rate, expressed as a ratio of the normal playback speed. For example, use 1.0 for normal speed, 2.0 for double speed, and 0.5 for half speed.

Return Value

true if the specified playback rate is supported; otherwise, it is false.

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

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 18\Media"
End Class

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 18\Media";
}

Target Platforms

Reference

PlayCtrl Class
PlayCtrl Members