UWP调用前置摄像头（Cs）

前台加入MediaPlayerElement控件显示摄像头数据

   <Grid>

       <MediaPlayerElement Name="UIMediaPlayerElement" Stretch="Uniform" AreTransportControlsEnabled="False" Canvas.ZIndex="-1" MaxWidth="720" MaxHeight="720" Grid.Column="0" />

   </Grid>

后台代码，将摄像头数据输出到MediaPlayerElement控件

private async Task StartPreviewAsync()

{

Debug.WriteLine("StartPreview");

// Find the sources

var allGroups = await MediaFrameSourceGroup.FindAllAsync();

List<MediaFrameSourceGroup> _mediaFrameSourceGroupList = allGroups.Where(group => group.SourceInfos.Any(sourceInfo => sourceInfo.SourceKind == MediaFrameSourceKind.Color

  && (sourceInfo.MediaStreamType == MediaStreamType.VideoPreview

  || sourceInfo.MediaStreamType == MediaStreamType.VideoRecord))).ToList();

var _selectedMediaFrameSourceGroup = _mediaFrameSourceGroupList[0];

// Create MediaCapture and its settings

MediaCapture _mediaCapture= new MediaCapture();

var settings = new MediaCaptureInitializationSettings

{

SourceGroup = _selectedMediaFrameSourceGroup,

PhotoCaptureSource = PhotoCaptureSource.Auto,

MemoryPreference = MediaCaptureMemoryPreference.Cpu,

StreamingCaptureMode = StreamingCaptureMode.Video

};

// Initialize MediaCapture

await _mediaCapture.InitializeAsync(settings);

MediaFrameSource _selectedMediaFrameSource = _mediaCapture.FrameSources.FirstOrDefault(source => source.Value.Info.MediaStreamType == MediaStreamType.VideoPreview

 && source.Value.Info.SourceKind == MediaFrameSourceKind.Color).Value;

if (_selectedMediaFrameSource == null)

{

_selectedMediaFrameSource = _mediaCapture.FrameSources.FirstOrDefault(source => source.Value.Info.MediaStreamType == MediaStreamType.VideoRecord

 && source.Value.Info.SourceKind == MediaFrameSourceKind.Color).Value;

}

// if no preview stream are available, bail

if (_selectedMediaFrameSource == null)

{

return;

}

var _mediaPlayer = new MediaPlayer();

_mediaPlayer.RealTimePlayback = true;

_mediaPlayer.AutoPlay = true;

_mediaPlayer.Source = MediaSource.CreateFromMediaFrameSource(_selectedMediaFrameSource);

UIMediaPlayerElement.SetMediaPlayer(_mediaPlayer);

UIMediaPlayerElement.Visibility = Visibility.Visible;

}

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