private async void _onFrameArraved()
{
TimeSpan _lastTimeStamp = _startTime;
while (_capturing)
{
QueryPerformanceCounter(out long start);
using (var frame = _framePool.TryGetNextFrame())
{
if (frame == null)
{
continue;
}
using (var bitmap = await SoftwareBitmap.CreateCopyFromSurfaceAsync(frame.Surface, BitmapAlphaMode.Premultiplied))
{
_processBitmap(bitmap, frame.SystemRelativeTime - _lastTimeStamp);
_lastTimeStamp = frame.SystemRelativeTime;
}
}
QueryPerformanceCounter(out long end);
var spendTime = TimeSpan.FromTicks(end - start);
if (spendTime < TimeSpan.FromMilliseconds(41))
{
await Task.Delay((TimeSpan.FromMilliseconds(41) - spendTime).Milliseconds);
}
}
_seesion.Dispose();
_framePool.Dispose();
_mediaEncoder.CloseVideoWriter();
}