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AudioFrequency Property

Summary

Gets the tuned audio frequency, in Hertz, for the currently selected channel.

Syntax

C++

public int AudioFrequency { get; }

Public ReadOnly Property AudioFrequency As Integer

public: 
property int AudioFrequency { 
   int get(); 
}

Property Value

A value which represents the tuned audio frequency.

Remarks

Gets the tuned audio frequency, in Hertz, for the currently selected channel. For more detailed information, refer to the Microsoft documentation for IAMTVTuner.get_AudioFrequency.

Example

using Leadtools; 
using Leadtools.MediaFoundation; 
using LeadtoolsMediaFoundationExamples.Fixtures; 
 
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.wmv"); 
   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; 
 
      // get the TV Tuner device 
      TVTuner tvtuner = capturectrl.TVTuner; 
 
      // Check if 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; 
 
      // check if we have can capture video 
      if (capturectrl.IsModeAvailable(CaptureMode.VideoAndAudio)) 
      { 
         // set the target format 
         capturectrl.TargetFormat = TargetFormatType.WMV; 
 
         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 20\Media"; 
}

Imports Leadtools 
Imports Leadtools.MediaFoundation 
Imports LeadtoolsMediaFoundationExamples.Fixtures 
 
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.wmv") 
   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 
 
      ' 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 
 
      ' check if we have can capture video 
      If capturectrl.IsModeAvailable(CaptureMode.VideoAndAudio) Then 
         ' set the target format 
         capturectrl.TargetFormat = TargetFormatType.WMV 
 
         capturectrl.TimeLimit = 10 ' just 10 seconds of capture time 
         capturectrl.UseTimeLimit = True 
 
         ' select the video subtype 
         capturectrl.VideoCaptureSubTypes(Leadtools.MediaFoundation.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 20\Media" 
End Class

Requirements

Target Platforms

Reference

TVTuner Class

TVTuner 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