private async void InitializeMediaCapture()
{
_capturedSequence = new List <IRandomAccessStream>();
_mediaCapture = new MediaCapture();
var devices = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture);
var backCamera = devices.FirstOrDefault(x => x.EnclosureLocation != null && x.EnclosureLocation.Panel == Windows.Devices.Enumeration.Panel.Back);
await _mediaCapture.InitializeAsync(new MediaCaptureInitializationSettings
{
StreamingCaptureMode = StreamingCaptureMode.Video,
PhotoCaptureSource = PhotoCaptureSource.Auto,
AudioDeviceId = string.Empty,
VideoDeviceId = backCamera.Id
});
captureElement.Source = _mediaCapture;
await _mediaCapture.StartPreviewAsync();
var format = ImageEncodingProperties.CreateJpeg();
format.Width = 640;
format.Height = 480;
_lowLagPhotoSequenceCapture = await _mediaCapture.PrepareLowLagPhotoSequenceCaptureAsync(format);
_lowLagPhotoSequenceCapture.PhotoCaptured += OnPhotoCaptured;
}
public static async void CaptureMorePhoto(Action <uint, uint, PhotoCapturedEventArgs> executeAction, Action overAction)
{
if (MainCamera.VideoDeviceController.LowLagPhotoSequence.Supported == false)
{
overAction();
return;
}
var captureTime = DateTime.Now;
var pastFrame = 10u;
var maxFrame = MainCamera.VideoDeviceController.LowLagPhotoSequence.MaxPastPhotos;
if (pastFrame > maxFrame)
{
pastFrame = maxFrame;
}
MainCamera.VideoDeviceController.LowLagPhotoSequence.ThumbnailEnabled = true;
MainCamera.VideoDeviceController.LowLagPhotoSequence.DesiredThumbnailSize = 300;
MainCamera.VideoDeviceController.LowLagPhotoSequence.PhotosPerSecondLimit = 4;
MainCamera.VideoDeviceController.LowLagPhotoSequence.PastPhotoLimit = pastFrame;
var photoCapture = await MainCamera.PrepareLowLagPhotoSequenceCaptureAsync(ImageEncodingProperties.CreateJpeg());
var nowIndex = 1u;
photoCapture.PhotoCaptured += new Windows.Foundation.TypedEventHandler <LowLagPhotoSequenceCapture, PhotoCapturedEventArgs>(async(ds, de) =>
{
if (nowIndex > pastFrame)
{
return;
}
executeAction(nowIndex, pastFrame, de);
//处理索引
if (nowIndex == pastFrame)
{
await ds.StopAsync();
await ds.FinishAsync();
overAction();
}
nowIndex++;
});
await photoCapture.StartAsync();
}
