VideoEncodingProperties GetVideoEncodingPropertiesForCameraParams(UnityEngine.Windows.WebCam.CameraParameters cameraParams)
{
var allPropertySets = _mediaCapture.VideoDeviceController.GetAvailableMediaStreamProperties(STREAM_TYPE).Select((x) => x as VideoEncodingProperties)
.Where((x) =>
{
if (x == null)
{
return(false);
}
if (x.FrameRate.Denominator == 0)
{
return(false);
}
double calculatedFrameRate = (double)x.FrameRate.Numerator / (double)x.FrameRate.Denominator;
return
(x.Width == (uint)cameraParams.cameraResolutionWidth &&
x.Height == (uint)cameraParams.cameraResolutionHeight &&
(int)Math.Round(calculatedFrameRate) == cameraParams.frameRate);
}); //Returns IEnumerable<VideoEncodingProperties>
if (allPropertySets.Count() == 0)
{
throw new Exception("Could not find an encoding property set that matches the given camera parameters.");
}
var chosenPropertySet = allPropertySets.FirstOrDefault();
return(chosenPropertySet);
}
/// <summary>
/// Asynchronously starts video mode.
///
/// Activates the web camera with the various settings specified in CameraParameters.
/// Only one VideoCapture instance can start the video mode at any given time.
/// After starting the video mode, you listen for new video frame samples via the VideoCapture.FrameSampleAcquired event,
/// or by calling VideoCapture.RequestNextFrameSample() when will return the next available sample.
/// While in video mode, more power will be consumed so make sure that you call VideoCapture.StopVideoModeAsync qhen you can afford the start/stop video mode overhead.
/// </summary>
/// <param name="setupParams">Parameters that change how video mode is used.</param>
/// <param name="onVideoModeStartedCallback">This callback will be invoked once video mode has been activated.</param>
public async void StartVideoModeAsync(UnityEngine.Windows.WebCam.CameraParameters setupParams, OnVideoModeStartedCallback onVideoModeStartedCallback)
{
var mediaFrameSource = _mediaCapture.FrameSources[_frameSourceInfo.Id]; //Returns a MediaFrameSource
if (mediaFrameSource == null)
{
onVideoModeStartedCallback?.Invoke(new VideoCaptureResult(1, ResultType.UnknownError, false));
return;
}
var pixelFormat = ConvertCapturePixelFormatToMediaEncodingSubtype(setupParams.pixelFormat);
_frameReader = await _mediaCapture.CreateFrameReaderAsync(mediaFrameSource, pixelFormat);
_frameReader.FrameArrived += HandleFrameArrived;
await _frameReader.StartAsync();
VideoEncodingProperties properties = GetVideoEncodingPropertiesForCameraParams(setupParams);
// Historical context: https://github.com/VulcanTechnologies/HoloLensCameraStream/issues/6
if (setupParams.rotateImage180Degrees)
{
properties.Properties.Add(ROTATION_KEY, 180);
}
// gr: taken from here https://forums.hololens.com/discussion/2009/mixedrealitycapture
IVideoEffectDefinition ved = new VideoMRCSettings(setupParams.enableHolograms, setupParams.enableVideoStabilization, setupParams.videoStabilizationBufferSize, setupParams.hologramOpacity);
await _mediaCapture.AddVideoEffectAsync(ved, MediaStreamType.VideoPreview);
await _mediaCapture.VideoDeviceController.SetMediaStreamPropertiesAsync(STREAM_TYPE, properties);
onVideoModeStartedCallback?.Invoke(new VideoCaptureResult(0, ResultType.Success, true));
}
// -------------------------------------------
/*
* OnPhotoCaptureCreated
*/
private void OnPhotoCaptureCreated(UnityEngine.Windows.WebCam.PhotoCapture captureObject)
{
m_photoCaptureObject = captureObject;
Resolution cameraResolution = UnityEngine.Windows.WebCam.PhotoCapture.SupportedResolutions.OrderByDescending((res) => res.width * res.height).First();
UnityEngine.Windows.WebCam.CameraParameters m_cameraParameters = new UnityEngine.Windows.WebCam.CameraParameters();
m_cameraParameters.hologramOpacity = 0.0f;
m_cameraParameters.cameraResolutionWidth = cameraResolution.width;
m_cameraParameters.cameraResolutionHeight = cameraResolution.height;
m_cameraParameters.pixelFormat = UnityEngine.Windows.WebCam.CapturePixelFormat.BGRA32;
}
