/// <summary>
/// Finds the video profile for the front and back camera and queries if
/// both cameras have a matching video recording profile that supports concurrency.
/// If a matching concurrent profile is supported, then we configure media initialization
/// settings for both cameras to the matching profile.
/// </summary>
/// <param name="sender">Contains information regarding button that fired event</param>
/// <param name="e">Contains state information and event data associated with the event</param>
private async void CheckConcurrentProfileBtn_Click(object sender, Windows.UI.Xaml.RoutedEventArgs e)
{
// Initialize our concurrency support flag.
bool concurrencySupported = false;
string frontVideoDeviceId = string.Empty;
string backVideoDeviceId = string.Empty;
MediaCapture mediaCaptureFront = new MediaCapture();
MediaCapture mediaCaptureBack = new MediaCapture();
// Find front and back Device Id of capture device that supports Video Profile
await LogStatusToOutputBox("Looking for all video capture devices on front panel");
frontVideoDeviceId = await GetVideoProfileSupportedDeviceIdAsync(Windows.Devices.Enumeration.Panel.Front);
await LogStatusToOutputBox("Looking for all video capture devices on back panel");
backVideoDeviceId = await GetVideoProfileSupportedDeviceIdAsync(Windows.Devices.Enumeration.Panel.Back);
// First check if the devices support video profiles, if not there's no reason to proceed
if (string.IsNullOrEmpty(frontVideoDeviceId) || string.IsNullOrEmpty(backVideoDeviceId))
{
await LogStatus("ERROR: A capture device doesn't support Video Profile", NotifyType.ErrorMessage);
return;
}
await LogStatusToOutputBox("Video Profiles are supported on both cameras");
// Create MediaCaptureInitilization settings for each video capture device
MediaCaptureInitializationSettings mediaInitSettingsFront = new MediaCaptureInitializationSettings();
MediaCaptureInitializationSettings mediaInitSettingsBack = new MediaCaptureInitializationSettings();
mediaInitSettingsFront.VideoDeviceId = frontVideoDeviceId;
mediaInitSettingsBack.VideoDeviceId = backVideoDeviceId;
await LogStatusToOutputBox(string.Format(CultureInfo.InvariantCulture, "Front Device Id located: {0}", frontVideoDeviceId.ToString()));
await LogStatusToOutputBox(string.Format(CultureInfo.InvariantCulture, "Back Device Id located: {0}", backVideoDeviceId.ToString()));
await LogStatusToOutputBox("Querying for concurrent profile");
// Acquire concurrent profiles available to front and back capture devices, then locate a concurrent
// profile Id that matches for both devices
var concurrentProfile = (from frontProfile in MediaCapture.FindConcurrentProfiles(frontVideoDeviceId)
from backProfile in MediaCapture.FindConcurrentProfiles(backVideoDeviceId)
where frontProfile.Id == backProfile.Id
select new { frontProfile, backProfile }).FirstOrDefault();
if (concurrentProfile != null)
{
mediaInitSettingsFront.VideoProfile = concurrentProfile.frontProfile;
mediaInitSettingsBack.VideoProfile = concurrentProfile.backProfile;
concurrencySupported = true;
await LogStatus("Concurrent profile located, device supports concurrency", NotifyType.StatusMessage);
}
else
{
// There are no concurrent profiles available on this device, thus
// there is not profile to select. With a lack of concurrent profile
// each camera will have to be managed manually and cannot support
// simultaneous streams. So we set the Video profile to null to
// indicate that camera must be managed individually.
mediaInitSettingsFront.VideoProfile = null;
mediaInitSettingsBack.VideoProfile = null;
await LogStatus("No Concurrent profiles located, device does not support concurrency", NotifyType.ErrorMessage);
}
await LogStatusToOutputBox("Initializing Front camera settings");
await mediaCaptureFront.InitializeAsync(mediaInitSettingsFront);
if (concurrencySupported)
{
await LogStatusToOutputBox("Device supports concurrency, initializing Back camera settings");
// Only initialize the back camera if concurrency is available. Otherwise,
// we can only use one camera at a time (which in this case will be the front
// camera).
await mediaCaptureBack.InitializeAsync(mediaInitSettingsBack);
}
}