public int SampleFrequency {get;}
public:
property int SampleFrequency {
int get();
}
The sample frequency, in hertz.
This is the number of audio samples received in one second. 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, contains information for the specific audio format. This information includes the BitsPerSample property, Channels property, and the SampleFrequency property.
The AudioFormat.Channels property is the number of channels for the audio format. The AudioFormat.BitsPerSample property is the number of bits per sample for the audio format
using Leadtools;
using Leadtools.MediaFoundation;
using LeadtoolsMediaFoundationExamples.Fixtures;
public CaptureCtrlForm _form = new CaptureCtrlForm(false);
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;
}
}
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