Gets the number of audio format channels.
public int Channels {get;}
Public ReadOnly Property Channels As Integer
public:
property int Channels {
int get();
}
A value representing the number of channels.
The AudioFormats object contains all the audio formats available for the current capture device. The AudioFormats object contains an AudioFormat object for each of the supported audio formats. The properties of each AudioFormat object, obtained using the [] indexer, contain information for the specific audio format. This information includes the BitsPerSample property, Channels property, and the SampleFrequency property.
The AudioFormat.BitsPerSample property is the number of bits per sample for the audio format The AudioFormat.SampleFrequency property is the sample frequency of the format.
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;
}
}
Imports Leadtools
Imports Leadtools.MediaFoundation
Imports LeadtoolsMediaFoundationExamples.Fixtures
Public _form As CaptureCtrlForm = New CaptureCtrlForm()
Public _result As Boolean = False
Public Sub AudioFormatExample()
Try
Dim count As Integer, freq As Integer = 0, bits As Integer = 0, channels As Integer = 0
Dim found As Integer, selected As Integer = -1
' reference the capture control
Dim capturectrl As CaptureCtrl = _form.CaptureCtrl
' set an audio device, use the name of your device here
If capturectrl.AudioDevices("USB") Is Nothing Then
Throw New Exception("No USB audio device available")
End If
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
Dim audioformats As AudioFormats = capturectrl.AudioCaptureFormats
' enumerate formats and select one
For Each af As AudioFormat In audioformats
freq = af.SampleFrequency
bits = af.BitsPerSample
channels = af.Channels
' select the format if it matches some criteria
If freq = 8000 AndAlso bits = 16 AndAlso channels = 2 Then
af.Selected = True
Exit For
End If
Next af
' 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 Then
audioformats.Selection = found
End If
' get the new selected format
selected = audioformats.Selection
' set our result based on what we expect
_result = (count > 0 AndAlso selected = found)
Catch e1 As Exception
_result = False
End Try
End Sub
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