# Audio sources

Video Capture SDK .Net VideoCaptureCoreX VideoCaptureCore

You can get audio from the following sources:

Audio capture devices
Audio from speakers/headphones/system (loopback)
IP cameras and other network streams
Decklink devices

# Audio capture devices

Enumerate audio capture devices.

var audioSources = await core.Audio_SourcesAsync();
foreach (var source in audioSources)
{
    // add to some combobox
    cbAudioInputDevice.Items.Add(source.DisplayName);
}

foreach (var device in core.Audio_CaptureDevices())
{
    // add to some combobox
    cbAudioInputDevice.Items.Add(device.Name);
}

Enumerate audio formats.

// find the device by name
var deviceItem = (await VideoCapture1.Audio_SourcesAsync()).FirstOrDefault(device => device.DisplayName == "Some device name");
if (deviceItem == null)
{
    return;
}

// enumerate formats
foreach (var format in deviceItem.Formats)
{
    cbAudioInputFormat.Items.Add(format.Name);
}

// find the device by name
var deviceItem = VideoCapture1.Audio_CaptureDevices().FirstOrDefault(device => device.Name == "Some device name");

// enumerate formats
foreach (var format in deviceItem.Formats)
{
    cbAudioInputFormat.Items.Add(format);
}

Set audio capture device as a source.

// find the device by name
var deviceItem = (await VideoCapture1.Audio_CaptureDevices()).FirstOrDefault(device => device.DisplayName == "Device name");
if (deviceItem == null)
{
    return;
}

// set the first format
AudioCaptureDeviceFormat format = formats[0].ToFormat();    

// create audio source settings
IVideoCaptureBaseAudioSourceSettings audioSource = deviceItem.CreateSourceSettingsVC(format);    

// set audio source
VideoCapture1.Audio_Source = audioSource;                   

// find the device by name
var deviceItem = VideoCapture1.Audio_CaptureDevices().FirstOrDefault(device => device.Name == "Some device name");
VideoCapture1.Audio_CaptureDevice = new AudioCaptureSource(deviceItem.Name);
VideoCapture1.Audio_CaptureDevice.Format = deviceItem.Formats[0].ToString(); // set the first format

# Audio from speakers (Windows audio loopback)

Enumerate audio loopback devices.

// Enumerate audio loopback devices
var audioSinks = await DeviceEnumerator.Shared.AudioOutputsAsync();
foreach (var sink in audioSinks)
{   
    // Filter by WASAPI2 API
    if (sink.API == AudioOutputDeviceAPI.WASAPI2)
    {
        // Add to some combobox
        cbAudioLoopbackDevice.Items.Add(sink.Name);
    }
}

Create source settings.

// audio input
var deviceItem = (await DeviceEnumerator.Shared.AudioOutputsAsync(AudioOutputDeviceAPI.WASAPI2)).FirstOrDefault(device => device.Name == "Output device name");
if (deviceItem == null)
{
    return;
}

IVideoCaptureBaseAudioSourceSettings audioSource = new LoopbackAudioCaptureDeviceSourceSettings(deviceItem);

VideoCapture1.Audio_Source = audioSource;

Set the audio capture source to VisioForge What You Hear Source to use audio loopback and capture sound from speakers.

VideoCapture1.Audio_CaptureDevice = new AudioCaptureSource("VisioForge What You Hear Source");
VideoCapture1.Audio_CaptureDevice.Format_UseBest = true;

Visit our GitHub page to get more code samples.