LEADTOOLS Multimedia (Leadtools.Multimedia assembly)
LEAD Technologies, Inc

VideoFrequency Property

Example 





Gets the video frequency, in Hertz, for the current channel.
Syntax
public int VideoFrequency {get;}
'Declaration
 
Public ReadOnly Property VideoFrequency As Integer
'Usage
 
Dim instance As TVTuner
Dim value As Integer
 
value = instance.VideoFrequency
public int VideoFrequency {get;}
 get_VideoFrequency(); 
public:
property int VideoFrequency {
   int get();
}

Property Value

A value that represents the video frequency, in Hertz.
Remarks
Gets the video frequency, in Hertz, for the current channel. For more detailed information, refer to the Microsoft documentation for IAMTVTuner.get_VideoFrequency.
Example
Copy CodeCopy Code  
Public _result As Boolean = False
      Public _form As CaptureCtrlForm = New CaptureCtrlForm()
      Public Sub AnalogTVTunerExample()
         ' reference the forms capture control and tv tuner
         Dim capturectrl As CaptureCtrl = _form.CaptureCtrl

         Dim outFile As String = Path.Combine(LEAD_VARS.MediaDir, "TVTuner_AnalogTVTunerExample.avi")
         Dim testChan As Integer = 6
         Dim channel As Integer

         Try
            ' select the first device with analog in it's name
            ' Replace "Analog" with your video capture device name
            If capturectrl.VideoDevices("Analog") Is Nothing Then
               Throw New Exception("No Analog video devices available!")
            End If

            capturectrl.VideoDevices("Analog").Selected = True

            ' use the video capture device's audio
            capturectrl.UseVideoDeviceAudio = True

            ' get the TV Tuner device
            Dim tvtuner As TVTuner = capturectrl.TVTuner

            ' Check if TV tuner is valid
            If Not tvtuner Is Nothing Then
               ' set the input type to cable and set the channel
               tvtuner.SetInputType(0, TunerInputType.Cable)
               tvtuner.SetChannel(testChan, -1, -1)

               ' get the Video and Audio frequency
               Dim vidFreq As Integer = tvtuner.VideoFrequency
               Dim audFreq As Integer = tvtuner.AudioFrequency
            End If

            ' set the output file
            capturectrl.TargetFile = outFile

            ' set the video and audio compressors
            capturectrl.VideoCompressors.Mpeg2.Selected = True
            capturectrl.AudioCompressors.AC3.Selected = True

            ' check if we have can capture video
            If capturectrl.IsModeAvailable(CaptureMode.VideoAndAudio) Then
               ' set the target format
               capturectrl.TargetFormat = TargetFormatType.AVI

               capturectrl.TimeLimit = 10 ' just 10 seconds of capture time
               capturectrl.UseTimeLimit = True

               ' select the video subtype
               capturectrl.VideoCaptureSubTypes(Leadtools.Multimedia.Constants.MEDIASUBTYPE_YUY2).Selected = True

               ' start the capture
               capturectrl.StartCapture(CaptureMode.VideoAndAudio)

               ' 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 capturectrl.State = CaptureState.Running
                  Application.DoEvents()
               Loop

               ' if TV tuner is valid
               If Not tvtuner Is Nothing Then
                  ' check the channel
                  channel = tvtuner.Channel

                  ' and set the result to what we expect
                  _result = (channel = testChan)
               End If
            End If
         Catch e1 As Exception
            _result = False
         End Try
      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 void AnalogTVTunerExample()
      {
         // reference the forms capture control and tv tuner
         CaptureCtrl capturectrl = _form.CaptureCtrl;

         string outFile =Path.Combine(LEAD_VARS.MediaDir,"TVTuner_AnalogTVTunerExample.avi");
         int testChan = 6;
         int channel;

         try
         {
            // select the first device with analog in it's name
            // Replace "Analog" with your video capture device name
            if (capturectrl.VideoDevices["Analog"] == null)
               throw new Exception("No Analog video devices available!");

            capturectrl.VideoDevices["Analog"].Selected = true;

            // use the video capture device's audio
            capturectrl.UseVideoDeviceAudio = true;

            // get the TV Tuner device
            TVTuner tvtuner = capturectrl.TVTuner;

            // check whether the TV tuner is valid
            if (tvtuner != null)
            {
               // set the input type to cable and set the channel
               tvtuner.SetInputType(0, TunerInputType.Cable);
               tvtuner.SetChannel(testChan, -1, -1);

               // get the Video and Audio frequency
               int vidFreq = tvtuner.VideoFrequency;
               int audFreq = tvtuner.AudioFrequency;
            }

            // set the output file
            capturectrl.TargetFile = outFile;

            // set the video and audio compressors
            capturectrl.VideoCompressors.Mpeg2.Selected = true;
            capturectrl.AudioCompressors.AC3.Selected = true;

            // check whether we can capture video
            if (capturectrl.IsModeAvailable(CaptureMode.VideoAndAudio))
            {
               // set the target format
               capturectrl.TargetFormat = TargetFormatType.AVI;

               capturectrl.TimeLimit = 10;     // just 10 seconds of capture time
               capturectrl.UseTimeLimit = true;

               // select the video subtype
               capturectrl.VideoCaptureSubTypes[Constants.MEDIASUBTYPE_YUY2].Selected = true;

               // start the capture
               capturectrl.StartCapture(CaptureMode.VideoAndAudio);

               // 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)
                  Application.DoEvents();

               // if TV tuner is valid
               if (tvtuner != null)
               {
                  // check the channel
                  channel = tvtuner.Channel;

                  // and set the result to what we expect
                  _result = (channel == testChan);
               }
            }
         }
         catch (Exception)
         {
            _result = false;
         }
      }

static class LEAD_VARS
{
   public const string MediaDir = @"C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 175\Media";
}
Requirements

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

See Also

Reference

TVTuner Class
TVTuner Members

 

 


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Leadtools.Multimedia requires a Multimedia or Multimedia Suite license and unlock key. For more information, refer to: LEADTOOLS Toolkit Features