Provides methods for taking a rapid sequence of low shutter lag photos.
The LowLagPhotoSequenceCapture class has these types of members:
The LowLagPhotoSequenceCapture class has these events.
|PhotoCaptured||Occurs when a photo has been captured.|
The LowLagPhotoSequenceCapture class has these methods. With C#, Visual Basic, and C++, it also inherits methods from the Object class.
|FinishAsync||Asynchronously releases the LowLagPhotoSequenceCapture object and resources used by the photo sequence capture operation.|
|StartAsync||Asynchronously starts capturing photos.|
|StopAsync||Asynchronously stops capturing photos.|
Photo sequence mode takes a rapid sequence of photos. A key scenario for photo sequence is getting photos in the past, that is prior to when the user takes a photo.
You can access the LowLagPhotoSequenceControl for the capture device through MediaCapture.VideoDeviceController. LowLagPhotoSequenceControl is used to manage settings related to the photo sequence session.
You can find out if the device supports photo sequence mode by checking LowLagPhotoSequenceControl.Supported.
Use MediaCapture.PrepareLowLagPhotoSequenceCaptureAsync to initialize the photo sequence capture. This is an asynchronous call which returns a LowLagPhotoSequenceCapture object when it is finished. This must be called before StartAsync.
To start capturing photos, call StartAsync. The app will continue to receive photos from the device until the operation is stopped.
Add a handler to the PhotoCaptured event in order to get the captured photos in the sequence. PhotoCapturedEventArgs provides the data for the captured frames. PhotoCapturedEventArgs.Frame contains the captured photo and PhotoCapturedEventArgs.Thumbnail contains the thumbnail.
FinishAsync stops the photo sequence capture operation and releases the LowLagPhotoSequenceCapture object and resources used by the photo sequence operation. If you want to restart the photo sequence operation after calling FinishAsync, you must call MediaCapture.PrepareLowLagPhotoSequenceCaptureAsync to initialize a new LowLagPhotoSequenceCapture object.
If the media type is changed or an effect is added, you must call MediaCapture.PrepareLowLagPhotoSequenceCaptureAsync to create a new LowLagPhotoCapture object.
LowLagPhotoSequenceControl.GetCurrentFrameRate specifies the frame rate at which the photos are taken.
PhotoCapturedEventArgs.CaptureTimeOffset can be used to tell whether a frame was in the future, greater than 0, or in the past, less than 0.
If the app wants to limit how many frames it gets per second, it can use LowLagPhotoSequenceControl.PhotosPerSecondLimit. This can be useful in situations where the sensor on the device can handle 30fps, but the app only needs 4fps.
To enable thumbnails, set LowLagPhotoSequenceControl.ThumbnailEnabled to true.
The number of past photos cannot be more than LowLagPhotoSequenceControl.MaxPastPhotos, which is the maximum number of past photos that is supported by the driver. The number of past photos returned will be the smaller of the following values: LowLagPhotoSequenceControl.PastPhotoLimit, LowLagPhotoSequenceControl.MaxPastPhotos, or the current number of available past photos.
Minimum supported client
|Windows 8.1 [Windows Store apps, desktop apps]|
Minimum supported server
|Windows Server 2012 R2 [Windows Store apps, desktop apps]|
Minimum supported phone
|Windows Phone 8.1 [Windows Phone Silverlight 8.1 and Windows Runtime apps]|