In This Topic ▼

Selected Property

Summary

Gets or sets a value that indicates if this audio format object is currently selected.

Syntax

C++/CLI

public bool Selected {get; set;}

public: 
property bool Selected { 
   bool get(); 
   void set (    bool ); 
}

Property Value

true if the audio format is selected; otherwise, it is false

Remarks

If the format is currently selected, changing its selection state will have no effect. One format must be selected at any time.

Example

using Leadtools; 
using Leadtools.MediaFoundation; 
using LeadtoolsMediaFoundationExamples.Fixtures; 
 
 
public CaptureCtrlForm _form = new CaptureCtrlForm(); 
public bool _result = false; 
 
public void AudioFormatExample() 
{ 
   try 
   { 
      int count, freq = 0, bits = 0, channels = 0; 
      int found, selected = -1; 
 
      // reference the capture control 
      CaptureCtrl capturectrl = _form.CaptureCtrl; 
 
      // set an audio device, use the name of your device here 
      if (capturectrl.AudioDevices["USB"] == null) 
         throw new Exception("No USB audio device available"); 
 
      capturectrl.AudioDevices["USB"].Selected = true; 
 
      // get count of available audio formats 
      count = capturectrl.AudioCaptureFormats.Count; 
 
      // reset the current selection to -1 
      capturectrl.AudioCaptureFormats.Selection = -1; 
 
      // reference the audioformats property 
      AudioFormats audioformats = capturectrl.AudioCaptureFormats; 
 
      // enumerate formats and select one 
      foreach (AudioFormat af in audioformats) 
      { 
         freq = af.SampleFrequency; 
         bits = af.BitsPerSample; 
         channels = af.Channels; 
 
         // select the format if it matches some criteria 
         if (freq == 8000 && bits == 16 && channels == 2) 
         { 
            af.Selected = true; 
            break; 
         } 
      } 
 
      // get the currently selected format 
      selected = audioformats.Selection; 
 
      // find a format based on frequency, bits/channel and number of channels 
      found = audioformats.IndexOf(8000, 8, 2); 
 
      // our found format is not selected, so select it 
      if (found != selected) 
         audioformats.Selection = found; 
 
      // get the new selected format 
      selected = audioformats.Selection; 
 
      // set our result based on what we expect 
      _result = (count > 0 && selected == found); 
   } 
   catch (Exception) 
   { 
      _result = false; 
   } 
}

Requirements

Target Platforms

Reference

AudioFormat Class

AudioFormat Members

Download our FREE evaluation

Help Version 22.0.2022.12.7

Leadtools.MediaFoundation Assembly

Introduction

Getting Started

Namespaces

Leadtools.MediaFoundation Namespace

Leadtools.MediaFoundation.Common Namespace

Assemblies