Audio Recorder App on Windows 10 IoT Core

In this sample, you will see how to make an audio recorder app on windows 10 IoT Core.

Components needed:

• 1 USB Headset

• 1 USB Mouse

• 1 HDMI Monitor and HDMI cable

• 1 Raspberry Pi2 Board

Rebuild the Sample App:

• Connect the USB headset, USB mouse, HDMI montior, Ethernet cable (or WiFi dongle if you are using WiFi ) to Raspberry Pi 2, and then power it on.

• Download the sample, build it and deploy on Raspberry Pi 2.

• You will see how the app runs on Raspberry Pi 2.

App Built Core Steps:

1. Open VS 2015, create a new Windows Universal Blank App:

2. Enable the capabilities in the package.appxmanifest as below. Make sure Microphone and VideoLibrary (where we will save the audio file) and Webcam capability selected:

3. In MainPage.xaml, add three buttons (startRecord,endRecord,PlayRecordedAudio) and one MediaElement. The MediaElement will be used to play recorded audio:

<Button Click="startRecord" Content="Start To Record" Margin="50,50,0,10"/>ode> <Button Click="endRecord" Content="End Record" Margin="50,10,0,10"/>ode> <Button Click="playRecordedAudio" Content="Play Recorded Audio" Margin="50,10,0,10"/>ode><MediaElement x:Name="media" Margin="0,10,0,10" Width="100"ode> Height="300"ode> AreTransportControlsEnabled="False"ode> AutoPlay="True">ode> </MediaElement>

4. In MainPage.xaml.cs, you will need to:

• Enumerate to find audio recording device:

 var devices = await      Windows.Devices.Enumeration.DeviceInformation.FindAllAsync(Windows.Devices.Enumeration.DeviceClass.AudioCapture);ode>

• Initialize the CaptureSetting and MediaCapture setting:

captureInitSettings = new Windows.Media.Capture.MediaCaptureInitializationSettings();captureInitSettings.StreamingCaptureMode = Windows.Media.Capture.StreamingCaptureMode.AudioAndVideo;

audioCapture = new Windows.Media.Capture.MediaCapture();await audioCapture.InitializeAsync(captureInitSettings);

• Start recording:

var storageFile = await Windows.Storage.KnownFolders.VideosLibrary.CreateFileAsync("audioOut.mp3", Windows.Storage.CreationCollisionOption.GenerateUniqueName);profile = MediaEncodingProfile.CreateM4a(Windows.Media.MediaProperties.AudioEncodingQuality.Auto);await audioCapture.StartRecordToStorageFileAsync(profile, storageFile);

• End recording:

await audioCapture.StopRecordAsync();

• Play recorded audio:

Windows.Storage.StorageFile storageFile = await Windows.Storage.KnownFolders.VideosLibrary.GetFileAsync(audioFileName); var stream = await storageFile.OpenAsync(Windows.Storage.FileAccessMode.Read); if (null != stream) { media.SetSource(stream, storageFile.ContentType); media.Play(); }

Once the project is coded and setup, you should be able to record the audio and play it back.