/// <summary>
/// Initialises the camera and resolves the resolution for both the
/// full resolution and preview images.
/// </summary>
private async void InitializeCameraAsync()
{
if (CameraState != CameraStates.NotInitialized)
{
Debug.WriteLine(DebugTag + "InitializeCameraAsync(): Invalid state");
return;
}
Debug.WriteLine(DebugTag + "InitializeCameraAsync() ->");
CameraState = CameraStates.Initializing;
ProgressIndicator.IsActive = true;
MessageDialog messageDialog = null;
#if WINDOWS_PHONE_APP
DeviceInformationCollection devices;
devices = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture);
if (devices.Count == 0)
{
ProgressIndicator.IsActive = false;
CameraState = CameraStates.NotInitialized;
messageDialog = new MessageDialog(
_resourceLoader.GetString("FailedToFindCameraDevice/Text"),
_resourceLoader.GetString("CameraInitializationFailed/Text"));
await messageDialog.ShowAsync();
return;
}
// Use the back camera
DeviceInformation info = devices[0];
_cam = true;
foreach (var devInfo in devices)
{
if (devInfo.Name.ToLowerInvariant().Contains("back"))
{
info = devInfo;
_cam = false; // Set this to true if you use front camera
break;
}
}
MyCaptureElement.FlowDirection = _cam ? FlowDirection.RightToLeft : FlowDirection.LeftToRight;
#endif
_mediaCapture = new MediaCapture();
try
{
#if WINDOWS_PHONE_APP
await _mediaCapture.InitializeAsync(
new MediaCaptureInitializationSettings
{
StreamingCaptureMode = StreamingCaptureMode.Video,
PhotoCaptureSource = PhotoCaptureSource.VideoPreview,
AudioDeviceId = string.Empty,
VideoDeviceId = info.Id
});
#else
await _mediaCapture.InitializeAsync();
#endif
}
catch (Exception ex)
{
messageDialog = new MessageDialog(ex.ToString(), _resourceLoader.GetString("CameraInitializationFailed/Text"));
}
MyCaptureElement.Source = _mediaCapture;
if (messageDialog != null)
{
/* Add commands and set their callbacks; both buttons use the
* same callback function instead of inline event handlers
*/
if (messageDialog.Commands != null)
{
messageDialog.Commands.Add(new UICommand(_resourceLoader.GetString("Retry/Text"), CommandInvokedHandler));
messageDialog.Commands.Add(new UICommand(_resourceLoader.GetString("Cancel/Text"), CommandInvokedHandler));
}
// Set the command that will be invoked by default
messageDialog.DefaultCommandIndex = 0;
// Set the command to be invoked when escape is pressed
messageDialog.CancelCommandIndex = 1;
await messageDialog.ShowAsync();
}
else
{
// Get the resolution
uint width = 0;
uint height = 0;
IMediaEncodingProperties propertiesToSet = null;
AppUtils.GetBestResolution(_mediaCapture, ref width, ref height, ref propertiesToSet);
if (width > 0 && height > 0)
{
_dataContext.SetFullResolution((int)width, (int)height);
int previewWidth = (int)FilterEffects.DataContext.DefaultPreviewResolutionWidth;
int previewHeight = 0;
AppUtils.CalculatePreviewResolution((int)width, (int)height, ref previewWidth, ref previewHeight);
_dataContext.SetPreviewResolution(previewWidth, previewHeight);
}
if (propertiesToSet != null)
{
await _mediaCapture.VideoDeviceController.SetMediaStreamPropertiesAsync(
MediaStreamType.Photo, propertiesToSet);
Debug.WriteLine(DebugTag + "Capture resolution set to " + width + "x" + height + "!");
}
else
{
Debug.WriteLine(DebugTag + "Failed to set capture resolution! Using fallback resolution.");
var fallbackResolution = new Size(
FilterEffects.DataContext.DefaultPreviewResolutionWidth,
FilterEffects.DataContext.DefaultPreviewResolutionHeight);
_dataContext.PreviewResolution = fallbackResolution;
_dataContext.FullResolution = fallbackResolution;
}
_mediaCapture.SetPreviewMirroring(false);
await _mediaCapture.StartPreviewAsync();
}
#if WINDOWS_PHONE_APP
// In case front camera is used, we need to handle the rotations
DisplayInformation displayInfo = DisplayInformation.GetForCurrentView();
displayInfo.OrientationChanged += DisplayInfo_OrientationChanged;
DisplayInfo_OrientationChanged(displayInfo, null);
#endif
CameraState = CameraStates.Initialized;
ProgressIndicator.IsActive = false;
CaptureButton.IsEnabled = true;
Debug.WriteLine(DebugTag + "InitializeCameraAsync() <-");
}
private async void SelectImageButton_Click(object sender, RoutedEventArgs e)
{
await _photoCaptureManager.StopPreviewAsync();
var openPicker = new Windows.Storage.Pickers.FileOpenPicker
{
SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.PicturesLibrary,
ViewMode = Windows.Storage.Pickers.PickerViewMode.Thumbnail
};
// Filter to include a sample subset of file types
openPicker.FileTypeFilter.Clear();
foreach (string postfix in _supportedImageFilePostfixes)
{
openPicker.FileTypeFilter.Add(postfix);
}
// Open the file picker
Windows.Storage.StorageFile file = await openPicker.PickSingleFileAsync();
// File is null if user cancels the file picker
if (file != null)
{
var fileStream = await file.OpenAsync(Windows.Storage.FileAccessMode.Read);
// Reset the streams
_dataContext.ResetStreams();
var image = new BitmapImage();
image.SetSource(fileStream);
int width = image.PixelWidth;
int height = image.PixelHeight;
var bitmap = new WriteableBitmap(width, height);
_dataContext.SetFullResolution(width, height);
int previewWidth = (int)FilterEffects.DataContext.DefaultPreviewResolutionWidth;
int previewHeight = 0;
AppUtils.CalculatePreviewResolution(width, height, ref previewWidth, ref previewHeight);
_dataContext.SetPreviewResolution(previewWidth, previewHeight);
bool success = false;
try
{
// Jpeg images can be used as such.
Stream stream = fileStream.AsStream();
stream.Position = 0;
stream.CopyTo(_dataContext.FullResolutionStream);
success = true;
}
catch (Exception ex)
{
Debug.WriteLine(DebugTag
+ "Cannot use stream as such (not probably jpeg): " + ex.Message);
}
if (!success)
{
// TODO: Test this part! It may not work.
//
// Image format is not jpeg. Can be anything, so first
// load it into a bitmap image and then write as jpeg.
bitmap.SetSource(fileStream);
var inStream = (IRandomAccessStream)_dataContext.FullResolutionStream.AsInputStream();
BitmapEncoder encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.JpegEncoderId, inStream);
Stream outStream = bitmap.PixelBuffer.AsStream();
var pixels = new byte[outStream.Length];
await outStream.ReadAsync(pixels, 0, pixels.Length);
encoder.SetPixelData(BitmapPixelFormat.Bgra8, BitmapAlphaMode.Ignore, (uint)width, (uint)height, 96.0, 96.0, pixels);
await encoder.FlushAsync();
}
await AppUtils.ScaleImageStreamAsync(
_dataContext.FullResolutionStream,
_dataContext.FullResolution,
_dataContext.PreviewResolutionStream,
_dataContext.PreviewResolution);
_dataContext.WasCaptured = false;
Frame.Navigate(typeof(PreviewPage));
} // if (file != null)
}
/// <summary>
///
/// </summary>
private async void InitializeCameraAsync()
{
MessageDialog messageDialog = null;
try
{
await _photoCaptureManager.InitializeAsync();
CapturePreview.Source = _photoCaptureManager;
}
catch (Exception ex)
{
messageDialog = new MessageDialog(ex.ToString(), Strings.CameraInitializationFailed);
}
if (messageDialog != null)
{
/* Add commands and set their callbacks; both buttons use the
* same callback function instead of inline event handlers
*/
if (messageDialog.Commands != null)
{
messageDialog.Commands.Add(new UICommand(Strings.Retry, CommandInvokedHandler));
messageDialog.Commands.Add(new UICommand(Strings.Cancel, CommandInvokedHandler));
}
// Set the command that will be invoked by default
messageDialog.DefaultCommandIndex = 0;
// Set the command to be invoked when escape is pressed
messageDialog.CancelCommandIndex = 1;
await messageDialog.ShowAsync();
}
else
{
// Get the resolution
if (_photoCaptureManager.VideoDeviceController != null)
{
var mediaEncodingPropertiesList = _photoCaptureManager.VideoDeviceController.GetAvailableMediaStreamProperties(MediaStreamType.Photo);
uint width = 0;
uint height = 0;
IMediaEncodingProperties propertiesToSet = null;
for (int i = 0; i < mediaEncodingPropertiesList.Count; ++i)
{
IMediaEncodingProperties mediaEncodingProperties =
mediaEncodingPropertiesList.ElementAt(i);
uint foundWidth = 0;
uint foundHeight = 0;
try
{
var properties = mediaEncodingProperties as ImageEncodingProperties;
if (properties != null)
{
foundWidth = properties.Width;
foundHeight = properties.Height;
}
else
{
var encodingProperties = mediaEncodingProperties as VideoEncodingProperties;
if (encodingProperties != null)
{
foundWidth = encodingProperties.Width;
foundHeight = encodingProperties.Height;
}
}
}
catch (Exception ex)
{
Debug.WriteLine(DebugTag + "Failed to resolve available resolutions: " + ex.Message);
}
Debug.WriteLine(DebugTag + "Available resolution: "
+ foundWidth + "x" + foundHeight);
//if (encodingProperties.Width * encodingProperties.Height > width * height) // Use this to get the resolution with the most pixels
if (foundWidth > width) // Use this to get the widest resolution
{
width = foundWidth;
height = foundHeight;
propertiesToSet = mediaEncodingProperties;
}
}
if (width > 0 && height > 0)
{
_dataContext.SetFullResolution((int)width, (int)height);
int previewWidth = (int)FilterEffects.DataContext.DefaultPreviewResolutionWidth;
int previewHeight = 0;
AppUtils.CalculatePreviewResolution((int)width, (int)height, ref previewWidth, ref previewHeight);
_dataContext.SetPreviewResolution(previewWidth, previewHeight);
}
if (propertiesToSet != null)
{
await _photoCaptureManager.VideoDeviceController.SetMediaStreamPropertiesAsync(MediaStreamType.Photo, propertiesToSet);
Debug.WriteLine(DebugTag + "Capture resolution set to "
+ width + "x" + height + "!");
}
else
{
Debug.WriteLine(DebugTag + "Failed to set capture resolution! Using fallback resolution.");
var fallbackResolution = new Size(
FilterEffects.DataContext.DefaultPreviewResolutionWidth,
FilterEffects.DataContext.DefaultPreviewResolutionHeight);
_dataContext.PreviewResolution = fallbackResolution;
_dataContext.FullResolution = fallbackResolution;
}
}
// Start the camera
await _photoCaptureManager.StartPreviewAsync();
}
}
/// <summary>
/// Reads the given image file and writes it to the buffers while also
/// scaling a preview image.
///
/// Note that this method can't handle null argument!
/// </summary>
/// <param name="file">The selected image file.</param>
/// <returns>True if successful, false otherwise.</returns>
private async Task <bool> HandleSelectedImageFileAsync(StorageFile file)
{
System.Diagnostics.Debug.WriteLine(DebugTag + "HandleSelectedImageFile(): " + file.Name);
var fileStream = await file.OpenAsync(Windows.Storage.FileAccessMode.Read);
DataContext dataContext = DataContext.Instance;
// Reset the streams
dataContext.ResetStreams();
var image = new BitmapImage();
image.SetSource(fileStream);
int width = image.PixelWidth;
int height = image.PixelHeight;
dataContext.SetFullResolution(width, height);
int previewWidth = (int)FilterEffects.DataContext.DefaultPreviewResolutionWidth;
int previewHeight = 0;
AppUtils.CalculatePreviewResolution(width, height, ref previewWidth, ref previewHeight);
dataContext.SetPreviewResolution(previewWidth, previewHeight);
bool success = false;
try
{
// JPEG images can be used as such
Stream stream = fileStream.AsStream();
stream.Position = 0;
stream.CopyTo(dataContext.FullResolutionStream);
success = true;
}
catch (Exception e)
{
System.Diagnostics.Debug.WriteLine(DebugTag
+ "Cannot use stream as such (not probably in JPEG format): " + e.Message);
}
if (!success)
{
try
{
await AppUtils.FileStreamToJpegStreamAsync(fileStream,
(IRandomAccessStream)dataContext.FullResolutionStream.AsInputStream());
success = true;
}
catch (Exception e)
{
System.Diagnostics.Debug.WriteLine(DebugTag
+ "Failed to convert the file stream content into JPEG format: "
+ e.ToString());
}
}
if (success)
{
await AppUtils.ScaleImageStreamAsync(
dataContext.FullResolutionStream,
dataContext.FullResolution,
dataContext.PreviewResolutionStream,
dataContext.PreviewResolution);
dataContext.WasCaptured = false;
}
return(success);
}
