protected override void OpenMediaAsync()
{
// Initialize data structures to pass to the Media pipeline via the MediaStreamSource
Dictionary <MediaSourceAttributesKeys, string> mediaSourceAttributes = new Dictionary <MediaSourceAttributesKeys, string>();
Dictionary <MediaStreamAttributeKeys, string> mediaStreamAttributes = new Dictionary <MediaStreamAttributeKeys, string>();
List <MediaStreamDescription> mediaStreamDescriptions = new List <MediaStreamDescription>();
CameraStreamSourceDataSingleton dataSource = CameraStreamSourceDataSingleton.Instance;
mediaStreamAttributes[MediaStreamAttributeKeys.VideoFourCC] = "RGBA";
mediaStreamAttributes[MediaStreamAttributeKeys.Width] = dataSource.FrameWidth.ToString();
mediaStreamAttributes[MediaStreamAttributeKeys.Height] = dataSource.FrameHeight.ToString();
videoStreamDescription = new MediaStreamDescription(MediaStreamType.Video, mediaStreamAttributes);
mediaStreamDescriptions.Add(videoStreamDescription);
// a zero timespan is an infinite video
mediaSourceAttributes[MediaSourceAttributesKeys.Duration] =
TimeSpan.FromSeconds(0).Ticks.ToString(CultureInfo.InvariantCulture);
mediaSourceAttributes[MediaSourceAttributesKeys.CanSeek] = false.ToString();
frameTime = (int)TimeSpan.FromSeconds((double)0).Ticks;
// Report that we finished initializing its internal state and can now
// pass in frame samples.
ReportOpenMediaCompleted(mediaSourceAttributes, mediaStreamDescriptions);
}
protected override void GetSampleAsync(MediaStreamType mediaStreamType)
{
CameraStreamSourceDataSingleton dataSource = CameraStreamSourceDataSingleton.Instance;
if (frameStreamOffset + dataSource.FrameBufferSize > dataSource.FrameStreamSize)
{
dataSource.FrameStream.Seek(0, SeekOrigin.Begin);
frameStreamOffset = 0;
}
Task tsk = dataSource.CameraEffect.GetNewFrameAndApplyEffect().AsTask();
// Wait that the asynchroneous call completes, and proceed by reporting
// the MediaElement that new samples are ready.
tsk.ContinueWith((task) =>
{
dataSource.FrameStream.Position = 0;
MediaStreamSample msSamp = new MediaStreamSample(
videoStreamDescription,
dataSource.FrameStream,
frameStreamOffset,
dataSource.FrameBufferSize,
currentTime,
emptySampleDict);
ReportGetSampleCompleted(msSamp);
currentTime += frameTime;
frameStreamOffset += dataSource.FrameBufferSize;
});
}
public CameraStreamSource(ICameraEffect cameraEffect, Size targetMediaElementSize)
{
CameraStreamSourceDataSingleton dataSource = CameraStreamSourceDataSingleton.Instance;
dataSource.Initialize(targetMediaElementSize);
dataSource.CameraEffect = cameraEffect;
cameraEffect.OutputBufferSize = targetMediaElementSize;
cameraEffect.OutputBuffer = dataSource.ImageBuffer.AsBuffer();
}
