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AudioBufferSize Property

Summary

Gets or sets the audio capture buffer size, in seconds.

Syntax

C++

public virtual double AudioBufferSize { get; set; }

Public Overridable Property AudioBufferSize As Double

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

Property Value

A value representing the capture buffer size.

Remarks

The default value is 0.5 seconds. Assignment can raise an error exception. For more information, refer to the Error Codes.

Example

using Leadtools; 
using Leadtools.Multimedia; 
using LeadtoolsMultimediaExamples.Fixtures; 
 
public bool _result = false; 
public CaptureCtrlForm _form = new CaptureCtrlForm(); 
 
// capture control 
CaptureCtrl capturectrl; 
 
// output file 
string outFile = Path.Combine(LEAD_VARS.MediaDir, "CaptureCtrl_AudioBufferSizeExample.avi"); 
 
public void AudioBufferSizeExample() 
{ 
   // reference the capture control 
   capturectrl = _form.CaptureCtrl; 
 
   // audio buffer size 
   double AudioBufferSize; 
 
   try 
   { 
      // set the source video device. use your device's name here 
      if (capturectrl.VideoDevices["USB"] == null) 
      { 
         throw new Exception("No USB video device available"); 
      } 
 
      capturectrl.VideoDevices["USB"].Selected = true; 
 
      // set the source audio device. use your device's name here 
      if (capturectrl.AudioDevices["USB"] == null) 
      { 
         throw new Exception("No USB audio device available"); 
      } 
 
      capturectrl.AudioDevices["USB"].Selected = true; 
 
      // select a video compressor 
      capturectrl.VideoCompressors.Mpeg4.Selected = true; 
 
      // select an audio compressor 
      capturectrl.AudioCompressors.AC3.Selected = true; 
 
      // set the target output file 
      capturectrl.TargetFile = outFile; 
 
      // subscribe to the started event 
      capturectrl.Started += CaptureCtrl_Started; 
 
      // start capture 
      capturectrl.StartCapture(CaptureMode.VideoAndAudio); 
 
      // get audio buffer size 
      AudioBufferSize = capturectrl.AudioBufferSize; 
 
      // set the result to what we expect 
      _result = (AudioBufferSize > 0); 
   } 
   catch (COMException) 
   { 
      _result = false; 
   } 
   catch (Exception) 
   { 
      _result = false; 
   } 
} 
 
void CaptureCtrl_Started(object sender, EventArgs e) 
{ 
   // stop the capture (we do not need a complete capture for this example) 
   capturectrl.StopCapture(); 
} 
 
static class LEAD_VARS 
{ 
   public const string MediaDir = @"C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 19\Media"; 
}

Imports Leadtools 
Imports Leadtools.Multimedia 
Imports LeadtoolsMultimediaExamples.Fixtures 
 
Public _result As Boolean = False 
Public _form As CaptureCtrlForm = New CaptureCtrlForm() 
Public _capturectrl As CaptureCtrl 
 
Public Sub AudioBufferSizeExample() 
   ' reference the capture control 
   _capturectrl = _form.CaptureCtrl 
 
   ' output file 
   Dim outFile As String = Path.Combine(LEAD_VARS.MediaDir, "CaptureCtrl_AudioBufferSizeExample.avi") 
 
   ' audio buffer size 
   Dim AudioBufferSize As Double 
 
   Try 
      ' set the source video device, select using your device name here 
      If _capturectrl.VideoDevices("USB") Is Nothing Then 
         Throw New Exception("No USB video device available") 
      End If 
 
      _capturectrl.VideoDevices("USB").Selected = True 
 
      ' set the source audio device, select using your device name here 
      If _capturectrl.AudioDevices("USB") Is Nothing Then 
         Throw New Exception("No USB audio device available") 
      End If 
 
      _capturectrl.AudioDevices("USB").Selected = True 
 
      ' select a video compressor 
      _capturectrl.VideoCompressors.Mpeg4.Selected = True 
 
      ' select an audio compressor 
      _capturectrl.AudioCompressors.AC3.Selected = True 
 
      ' set the target output file 
      _capturectrl.TargetFile = outFile 
 
      ' subscribe to the started event 
      AddHandler _capturectrl.Started, AddressOf CaptureCtrl_Started 
 
      ' start capture 
      _capturectrl.StartCapture(CaptureMode.VideoAndAudio) 
 
      ' get audio buffer size 
      AudioBufferSize = _capturectrl.AudioBufferSize 
 
      ' set the result to what we expect 
      _result = (AudioBufferSize > 0) 
 
   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 _capturectrl.State = CaptureState.Running 
      Application.DoEvents() 
   Loop 
End Sub 
 
Private Sub CaptureCtrl_Started(ByVal sender As Object, ByVal e As EventArgs) 
   ' stop the capture (we don't need a complete capture for this example) 
   _capturectrl.StopCapture() 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const MediaDir As String = "C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 19\Media" 
End Class

Requirements

Target Platforms

Reference

CaptureCtrl Class

CaptureCtrl Members

Help Version 19.0.2017.10.27

Leadtools.Multimedia Assembly

Introduction

Getting Started

Namespaces

Leadtools.Multimedia Namespace

Leadtools.Multimedia.Common Namespace

Assemblies