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SharpDX XAudio2 no Sound with effects parameters

I am working on an application in C# using XAudio2 from SharpDX. I know its outdated but instead of CSCore it offers the better Reverb. The aim itself is simple: load a wav file (48khz,24bit,1channel), get it through the XAudio2 Reverb with several Reverb presets and do a playback.
I managed to implement everything for a normal playback and also built in the Reverb. The audio file will be played back with the defaul reverb settings but as soon as I change the preset or change a specific value (RoomFilterFreq) the file isnt audible anymore and i don´t know why this happens. Does anyone has a clue about this? I worked through the few examples which are still online but could not find a reason for this behaviour.
I´m coding under Visual Studio 2019 with Net 4.7.2. The code looks as followed:
xaudio2 = new XAudio2();
xaudio2.StartEngine();
var masteringVoice = new MasteringVoice(xaudio2, 1, 48000);
var stream = new SoundStream(File.OpenRead(soundFilepath));
SharpDX.Multimedia.WaveFormat waveFormat = stream.Format;
var buffer = new AudioBuffer
{
Stream = stream.ToDataStream(),
AudioBytes = (int)stream.Length,
Flags = BufferFlags.EndOfStream
};
stream.Close();
sourceVoice = new SourceVoice(xaudio2, waveFormat, true);
// Set Loop
if (f1.loopcheckBox.Checked == true)
{
buffer.LoopBegin = buffer.PlayBegin;
buffer.LoopLength = buffer.PlayLength;
buffer.LoopCount = AudioBuffer.LoopInfinite;
}
// Set Reverb
if (f1.reverbenableButton.BackColor == Color.LightGreen)
{
var reverb = new Reverb(xaudio2);
var reverbparameters = (ReverbParameters)ReverbI3DL2Parameters.Presets.Room;
var effectDescriptor = new EffectDescriptor(reverb);
if (waveFormat.Channels == 1)
{
effectDescriptor.OutputChannelCount = 1;
}
else if (waveFormat.Channels == 2)
{
effectDescriptor.OutputChannelCount = 2;
}
else
{
MessageBox.Show("Channelrate not supported!");
return sourceVoice = null;
}
sourceVoice.SetEffectChain(effectDescriptor);
sourceVoice.SetEffectParameters(0, reverbparameters);
sourceVoice.EnableEffect(0);
}
sourceVoice.SubmitSourceBuffer(buffer, stream.DecodedPacketsInfo);
sourceVoice.Start();

C# : Bluetooth GATT communication. GattCharacteristic.ValueChanged doesnt gets hit after sometime

I am working on wpf application that uses GATT for bluetooth communication. I am using GattCharacteristic.ValueChanged to handle any value from device. It works for sometime and the event handler doesnt gets called after 1 minute. This problem observed in windows 8.1, but working in windows 10.
I am made GattCharacteristic member variable, so the GC doesnt collect the variable. Still the problem exists.
Can anyone tell me what could be the potential problem here?
private GattCharacteristic m_DataSenderCharacteristics;
foreach (var service in serviceInfo)
{
var uuid = MjGattDeviceService.UuidFromServiceInformation(service);
//Battery Service
if (uuid.ToString() == BatteryUUID)
{
var bService = await GattDeviceService.FromIdAsync(service.Id);
m_Device.batteryService = bService;
}
if (uuid.ToString() == CustomServiceUUID)
{
m_Device.gattService = await GattDeviceService.FromIdAsync(service.Id);
Guid controlGUID = new Guid(ControlUUID);
var controlGattCharacteristics = m_Device.gattService.GetCharacteristics(controlGUID);
Byte[] bsdata = new Byte[] { 0x0b, 0x00, 0x02 };
IBuffer buffUTF8 = CryptographicBuffer.CreateFromByteArray(bsdata);
GattCommunicationStatus status = await controlGattCharacteristics[0].WriteClientCharacteristicConfigurationDescriptorAsync(GattClientCharacteristicConfigurationDescriptorValue.Notify);
if (status == GattCommunicationStatus.Unreachable)
{
m_Device.isConnected = false;
nextPage = "Unreachable";
}
else if (status == GattCommunicationStatus.Success)
{
var ctrlStatus = await controlGattCharacteristics[0].WriteValueAsync(buffUTF8);
Guid guuid1 = new Guid(DataSenderUUID);
m_DataSenderCharacteristics = m_Device.gattService.GetCharacteristics(guuid1)[0];
GattCommunicationStatus notifyStatus = await m_DataSenderCharacteristics.
WriteClientCharacteristicConfigurationDescriptorAsync(GattClientCharacteristicConfigurationDescriptorValue.Notify);
//This event handler will be called for some 1 minute. After it falls dead
m_DataSenderCharacteristics[0].ValueChanged += GestureValueChanged;
if (notifyStatus == GattCommunicationStatus.Success)
{
nextPage = "Connected";
}
}
}
}

AutoCAD .net Side loading a dwg with ReadDwgFile then Plotting

I used the example here to side load dwgs into memory combined with the example here of Plot From Model Space. I got things working except for the plots are not respecting whether the layers are frozen or not and printing as if they were all thawed. The data coming in from the dwg is correct. I can iterate the layers while debugging and verify the correct ones are either frozen or thawed. Also If I just saveas the dwg to a new name it matches the original concerning the layer state.Any Ideas?
[CommandMethod("PlotLayout")]
public static void PlotLayout()
{
// Get the current document and database, and start a transaction
Document acDoc = Active.Document;
Database acCurDb = Active.Database;
Editor ed = Active.Editor;
var collection = new List<string>() { "C:\\Test\\440001A.dwg", "C:\\Test\\440001B.dwg", "C:\\Test\\440001C.dwg", "C:\\Test\\440001D.dwg" };
for (int i = 0; i < collection.Count; i++)
{
var dwg = collection[i];
var dir = Path.GetDirectoryName(dwg);
var fn = Path.GetFileNameWithoutExtension(dwg);
var filePath = Path.Combine(dir, fn + "-" + i.ToString() + ".pdf");
Database oldDb = HostApplicationServices.WorkingDatabase;
using (Database db = new Database(false, true))
{
db.ReadDwgFile(dwg, FileOpenMode.OpenForReadAndAllShare, false, null);
db.CloseInput(true);
using (Transaction acTrans = db.TransactionManager.StartTransaction())
try
{
HostApplicationServices.WorkingDatabase = db;
LayoutManager acLayoutMgr = LayoutManager.Current;
// Get the current layout and output its name in the Command Line window
Layout acLayout = acTrans.GetObject(acLayoutMgr.GetLayoutId(acLayoutMgr.CurrentLayout),
OpenMode.ForRead) as Layout;
// Get the PlotInfo from the layout
using (PlotInfo acPlInfo = new PlotInfo())
{
acPlInfo.Layout = acLayout.ObjectId;
// Get a copy of the PlotSettings from the layout
using (PlotSettings acPlSet = new PlotSettings(acLayout.ModelType))
{
acPlSet.CopyFrom(acLayout);
// Update the PlotSettings object
PlotSettingsValidator acPlSetVdr = PlotSettingsValidator.Current;
// Set the plot type
acPlSetVdr.SetPlotType(acPlSet, Autodesk.AutoCAD.DatabaseServices.PlotType.Extents);
// Set the plot scale
acPlSetVdr.SetUseStandardScale(acPlSet, true);
acPlSetVdr.SetStdScaleType(acPlSet, StdScaleType.ScaleToFit);
// Center the plot
acPlSetVdr.SetPlotCentered(acPlSet, true);
// Set the plot device to use
acPlSetVdr.SetPlotConfigurationName(acPlSet, "DWF6 ePlot.pc3", "ANSI_B_(11.00_x_17.00_Inches)");
// Set the plot info as an override since it will
// not be saved back to the layout
acPlInfo.OverrideSettings = acPlSet;
// Validate the plot info
using (PlotInfoValidator acPlInfoVdr = new PlotInfoValidator())
{
acPlInfoVdr.MediaMatchingPolicy = MatchingPolicy.MatchEnabled;
acPlInfoVdr.Validate(acPlInfo);
// Check to see if a plot is already in progress
if (PlotFactory.ProcessPlotState == ProcessPlotState.NotPlotting)
{
using (PlotEngine acPlEng = PlotFactory.CreatePublishEngine())
{
// Track the plot progress with a Progress dialog
using (PlotProgressDialog acPlProgDlg = new PlotProgressDialog(false, 1, true))
{
using ((acPlProgDlg))
{
// Define the status messages to display
// when plotting starts
acPlProgDlg.set_PlotMsgString(PlotMessageIndex.DialogTitle, "Plot Progress");
acPlProgDlg.set_PlotMsgString(PlotMessageIndex.CancelJobButtonMessage, "Cancel Job");
acPlProgDlg.set_PlotMsgString(PlotMessageIndex.CancelSheetButtonMessage, "Cancel Sheet");
acPlProgDlg.set_PlotMsgString(PlotMessageIndex.SheetSetProgressCaption, "Sheet Set Progress");
acPlProgDlg.set_PlotMsgString(PlotMessageIndex.SheetProgressCaption, "Sheet Progress");
// Set the plot progress range
acPlProgDlg.LowerPlotProgressRange = 0;
acPlProgDlg.UpperPlotProgressRange = 100;
acPlProgDlg.PlotProgressPos = 0;
// Display the Progress dialog
acPlProgDlg.OnBeginPlot();
acPlProgDlg.IsVisible = true;
// Start to plot the layout
acPlEng.BeginPlot(acPlProgDlg, null);
// Define the plot output
acPlEng.BeginDocument(acPlInfo, acDoc.Name, null, 1, true, "c:\\myplot");
// Display information about the current plot
acPlProgDlg.set_PlotMsgString(PlotMessageIndex.Status, "Plotting: " + acDoc.Name + " - " + acLayout.LayoutName);
// Set the sheet progress range
acPlProgDlg.OnBeginSheet();
acPlProgDlg.LowerSheetProgressRange = 0;
acPlProgDlg.UpperSheetProgressRange = 100;
acPlProgDlg.SheetProgressPos = 0;
// Plot the first sheet/layout
using (PlotPageInfo acPlPageInfo = new PlotPageInfo())
{
acPlEng.BeginPage(acPlPageInfo, acPlInfo, true, null);
}
acPlEng.BeginGenerateGraphics(null);
acPlEng.EndGenerateGraphics(null);
// Finish plotting the sheet/layout
acPlEng.EndPage(null);
acPlProgDlg.SheetProgressPos = 100;
acPlProgDlg.OnEndSheet();
// Finish plotting the document
acPlEng.EndDocument(null);
// Finish the plot
acPlProgDlg.PlotProgressPos = 100;
acPlProgDlg.OnEndPlot();
acPlEng.EndPlot(null);
}
}
}
}
}
}
}
}
catch (System.Exception ex)
{
ed.WriteMessage(ex.ToString());
}
HostApplicationServices.WorkingDatabase = oldDb;
}
}
}

Not ideal but I found a work around. If I iterate the LayerTable, check for frozen then make IsPlottable false it prints correctly. If a better soultion is available please let me know. Thanks
LayerTable _LayerTable = acTrans.GetObject(db.LayerTableId, OpenMode.ForRead) as LayerTable;
foreach (ObjectId _LayerTableId in _LayerTable)
{
LayerTableRecord _LayerTableRecord =
(LayerTableRecord)acTrans.GetObject(_LayerTableId,
OpenMode.ForWrite);
if (_LayerTableRecord.IsFrozen)
{
_LayerTableRecord.IsPlottable = false;
}
}

windows phone 8.1 RT Zxing.net implementation : issue with CapturePhotoToStreamAsync

I'm using ZXing.net to create a UserControl for scanning barcode into a Windows Phone 8.1 RT app using the camera.
The barcode are decoded well but i'm having freezes on the UI when the method CapturePhotoToStreamAsync is called, even it is awaited.
It takes about 600 ms to execute.
I'm testing the app into the emulator.
The code below is executed in an async method :
// Preview of the camera
await _mediaCapture.InitializeAsync(settings);
VideoCapture.Source = _mediaCapture;
VideoCapture.FlowDirection = Windows.UI.Xaml.FlowDirection.LeftToRight;
await _mediaCapture.StartPreviewAsync();
VideoEncodingProperties res = _mediaCapture.VideoDeviceController.GetMediaStreamProperties(MediaStreamType.VideoPreview) as VideoEncodingProperties;
ImageEncodingProperties iep = ImageEncodingProperties.CreateBmp();
iep.Height = res.Height;
iep.Width = res.Width;
var barcodeReader = new BarcodeReader
{
TryHarder = true,
AutoRotate = true
};
WriteableBitmap wB = new WriteableBitmap((int)res.Width, (int)res.Height);
while (_result == null)
{
using (var stream = new InMemoryRandomAccessStream())
{
await _mediaCapture.CapturePhotoToStreamAsync(iep, stream);
stream.Seek(0);
await wB.SetSourceAsync(stream);
_result = barcodeReader.Decode(wB);
}
}
await _mediaCapture.StopPreviewAsync();
//callback to handle result
ScanCallback(_result.Text);
What can I do to prevent the UI from freezing ?

Luckily you don't have to capture photo to decode QRCode/Barcode on Windows Phone 8.1 Runtime. It is a quite new solution actually, but it works: https://github.com/mmaitre314/VideoEffect#realtime-video-analysis-and-qr-code-detection
After istalling the nuget package, you can easily decode barcodes realtime, without the need of calling CapturePhotoToStreamAsync. The only drawback is that you can only target ARM. You can find the sample code on the site. Or you can contact me, and I can send you the part of my project where I use this.

i always get better results when i use the camera to take a picture first (lets you focus on the correct place where the barcode is) and then send the picture for barcode recognition.
the stuttering is caused because you try to keep checking the live feed for barcodes which can be hard on the CPU (especially for ARM devices)
var dialog = new CameraCaptureUI();
StorageFile file = await dialog.CaptureFileAsync(CameraCaptureUIMode.Photo);
var stream = await file.OpenReadAsync();
// initialize with 1,1 to get the current size of the image
var writeableBmp = new WriteableBitmap(1, 1);
writeableBmp.SetSource(stream);
// and create it again because otherwise the WB isn't fully initialized and decoding
// results in a IndexOutOfRange
writeableBmp = new WriteableBitmap(writeableBmp.PixelWidth, writeableBmp.PixelHeight);
stream.Seek(0);
writeableBmp.SetSource(stream);
var result = ScanBitmap(writeableBmp);
string barcode = "";
if (result != null)
{
barcode = result.Text;
}
and here the ScanBitmap method:
private Result ScanBitmap(WriteableBitmap writeableBmp)
{
var barcodeReader = new BarcodeReader
{
Options = new ZXing.Common.DecodingOptions()
{
TryHarder = true
},
AutoRotate = true
};
var result = barcodeReader.Decode(writeableBmp);
if (result != null)
{
CaptureImage.Source = writeableBmp;
}
return result;
}

Creating Large List<T>

I have the following code:
var lstMusicInfo = new List<MediaFile>();
var LocalMusic = Directory.EnumerateFiles(AppSettings.Default.ComputerMusicFolder, "*.*", SearchOption.AllDirectories).AsParallel().ToList<string>();
LocalMusic = (from a in LocalMusic.AsParallel()
where a.EndsWith(".mp3") || a.EndsWith(".wma")
select a).ToList<string>();
var DeviceMusic = adb.SyncMedia(this.dev, AppSettings.Default.ComputerMusicFolder, 1);
Parallel.ForEach(LocalMusic, new Action<string>(item =>
{
try
{
UltraID3 mFile = new UltraID3();
FileInfo fInfo;
mFile.Read(item);
fInfo = new FileInfo(item);
bool onDevice = true;
if (DeviceMusic.Contains(item))
{
onDevice = false;
}
// My Problem starts here
lstMusicInfo.Add(new MediaFile()
{
Title = mFile.Title,
Album = mFile.Album,
Year = mFile.Year.ToString(),
ComDirectory = fInfo.Directory.FullName,
FileFullName = fInfo.FullName,
Artist = mFile.Artist,
OnDevice = onDevice,
PTDevice = false
});
//Ends here.
}
catch (Exception) { }
}));
this.Dispatcher.BeginInvoke(new Action(() =>
{
lstViewMusicFiles.ItemsSource = lstMusicInfo;
blkMusicStatus.Text = "";
doneLoading = true;
}));
#endregion
}));
The first part of the code gives me almost instant result containing:
Address on computer of 5780 files.
Get list of all music files on an android device compare it with those 5780 files and return a list of files found on computer but not on device (in my case it returns a list with 5118 items).
The block of code below is my problem, I am filling data into a class, then adding that class into a List<T>, doing it for 5780 times takes 60 seconds, how can I improve it?
// My Problem starts here
lstMusicInfo.Add(new MediaFile
{
Title = mFile.Title,
Album = mFile.Album,
Year = mFile.Year.ToString(),
ComDirectory = fInfo.Directory.FullName,
FileFullName = fInfo.FullName,
Artist = mFile.Artist,
OnDevice = onDevice,
PTDevice = false
});
//Ends here.
Update:
Here is the profiling result and I see it's obvious why it's slowing down >_>
I suppose I should look for a different library that reads music file information.

One way to avoid loading everything once, up front, would be to lazy load the ID3 information as necessary.
You'd construct your MediaFile instances thus...
new MediaFile(filePath)
...and MediaFile would look something like the following.
internal sealed class MediaFile
{
private readonly Lazy<UltraID3> _lazyFile;
public MediaFile(string filePath)
{
_lazyFile = new Lazy<UltraID3>(() =>
{
var file = new UltraID3();
file.Read(filePath);
return file;
});
}
public string Title
{
get { return _lazyFile.Value.Title; }
}
// ...
}
This is possibly less ideal than loading them as fast as you can in the background, if you do something like MediaFiles.OrderBy(x => x.Title).ToList() and nothing has been lazy loaded then you'll have to wait for every file to load.
Loading them in the background would make them available for use immediately after the background loading has finished. But you might have to concern yourself with not accessing some items until the background loading has finished.

You biggest bottleneck is new FileInfo(item), but you don't need FileInfo just to get the Directory and File names. You can use Path.GetDirectoryName and Path.GetFileName, which are must faster since no I/O is involved.
UltraID3 mFile = new UltraID3();
//FileInfo fInfo;
mFile.Read(item);
//fInfo = new FileInfo(item);
bool onDevice = true;
if (DeviceMusic.Contains(item))
{
onDevice = false;
}
// My Problem starts here
lstMusicInfo.Add(new MediaFile()
{
Title = mFile.Title,
Album = mFile.Album,
Year = mFile.Year.ToString(),
ComDirectory = Path.GetDirectoryName(item), // fInfo.Directory.FullName,
FileFullName = Path.GetFileName(item), //fInfo.FullName,
Artist = mFile.Artist,
OnDevice = onDevice,
PTDevice = false
});
//Ends here.