private FrameGrabber(IFrameGrabberDataSource datasource = null, MediaCapture mediaCapture = null, MediaFrameSource mediaFrameSource = null, MediaFrameReader mediaFrameReader = null)
{
this.datasource = datasource;
this.mediaCapture = mediaCapture;
this.mediaFrameSource = mediaFrameSource;
this.mediaFrameReader = mediaFrameReader;
if (this.mediaFrameReader != null)
{
this.mediaFrameReader.FrameArrived += MediaFrameReader_FrameArrived;
}
}
public static async Task <FrameGrabber> CreateAsync(IFrameGrabberDataSource datasource)
{
MediaCapture mediaCapture = null;
MediaFrameReader mediaFrameReader = null;
MediaFrameSourceGroup selectedGroup = null;
MediaFrameSourceInfo selectedSourceInfo = null;
// Pick first color source
var groups = await MediaFrameSourceGroup.FindAllAsync();
foreach (MediaFrameSourceGroup sourceGroup in groups)
{
foreach (MediaFrameSourceInfo sourceInfo in sourceGroup.SourceInfos)
{
if (sourceInfo.SourceKind == MediaFrameSourceKind.Color)
{
selectedSourceInfo = sourceInfo;
break;
}
}
if (selectedSourceInfo != null)
{
selectedGroup = sourceGroup;
break;
}
}
// No valid camera was found. This will happen on the emulator.
if (selectedGroup == null || selectedSourceInfo == null)
{
Debug.WriteLine("Failed to find Group and SourceInfo");
return(new FrameGrabber());
}
// Create settings
var settings = new MediaCaptureInitializationSettings
{
SourceGroup = selectedGroup,
// This media capture can share streaming with other apps.
SharingMode = MediaCaptureSharingMode.SharedReadOnly,
// Only stream video and don't initialize audio capture devices.
StreamingCaptureMode = StreamingCaptureMode.Video,
// Set to CPU to ensure frames always contain CPU SoftwareBitmap images
// instead of preferring GPU D3DSurface images.
MemoryPreference = MediaCaptureMemoryPreference.Cpu,
};
// Create and initilize capture device
mediaCapture = new MediaCapture();
try
{
await mediaCapture.InitializeAsync(settings);
}
catch (Exception e)
{
Debug.WriteLine($"Failed to initilise mediacaptrue {e.ToString()}");
return(new FrameGrabber());
}
MediaFrameSource selectedSource = mediaCapture.FrameSources[selectedSourceInfo.Id];
// create new frame reader
mediaFrameReader = await mediaCapture.CreateFrameReaderAsync(selectedSource);
MediaFrameReaderStartStatus status = await mediaFrameReader.StartAsync();
if (status == MediaFrameReaderStartStatus.Success)
{
Debug.WriteLine("MediaFrameReaderStartStatus == Success");
return(new FrameGrabber(datasource, mediaCapture, selectedSource, mediaFrameReader));
}
else
{
Debug.WriteLine($"MediaFrameReaderStartStatus != Success; {status}");
return(new FrameGrabber());
}
}
