private async Task StartRecordingAsync(RecordingOptions options)
{
// Encoders generally like even numbers
var width = EnsureEven(options.Resolution.Width);
var height = EnsureEven(options.Resolution.Height);
// Find a place to put our vidoe for now
var file = await GetTempFileAsync();
// Kick off the encoding
try
{
using (var stream = await file.OpenAsync(FileAccessMode.ReadWrite))
using (_encoder = new Encoder(_device, options.Target))
{
var surface = _encoder.CreatePreviewSurface(Window.Current.Compositor);
_previewBrush.Surface = surface;
await _encoder.EncodeAsync(
stream,
width, height, options.Bitrate,
options.FrameRate);
}
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
Debug.WriteLine(ex);
var message = GetMessageForHResult(ex.HResult);
if (message == null)
{
message = $"Uh-oh! Something went wrong!\n0x{ex.HResult:X8} - {ex.Message}";
}
var dialog = new MessageDialog(
message,
"Recording failed");
await dialog.ShowAsync();
// Go back to the main page
Frame.GoBack();
return;
}
// At this point the encoding has finished, let the user preview the file
Frame.Navigate(typeof(SavePage), file);
}
private void StartRecordingButton_Click(object sender, RoutedEventArgs e)
{
if (_preview == null)
{
throw new InvalidOperationException("There is no current preview!");
}
// Get our encoder properties
var frameRateItem = (FrameRateItem)FrameRateComboBox.SelectedItem;
var resolutionItem = (ResolutionItem)ResolutionComboBox.SelectedItem;
var bitrateItem = (BitrateItem)BitrateComboBox.SelectedItem;
var useSourceSize = resolutionItem.IsZero();
var width = resolutionItem.Resolution.Width;
var height = resolutionItem.Resolution.Height;
var bitrate = bitrateItem.Bitrate;
var frameRate = frameRateItem.FrameRate;
// Use the capture item's size for the encoding if desired
if (useSourceSize)
{
var targetSize = _preview.Target.Size;
width = (uint)targetSize.Width;
height = (uint)targetSize.Height;
}
var resolution = new SizeUInt32()
{
Width = width, Height = height
};
var recordingOptions = new RecordingOptions(_preview.Target, resolution, bitrate, frameRate);
_preview.Dispose();
_preview = null;
StartRecordingButton.IsEnabled = false;
Frame.Navigate(typeof(RecordingPage), recordingOptions);
}