Develop Reference

Change sample rate of audiocard with WasapiOut Naudio

I want to chose a specific sample rate for my audio card programmatically in c# with Naudio.
My output is a WasapiOut in exclusive mode.
I already tried a lot of things, but nothing worked and I've searched everywhere and I only found this : How to Change Speaker Configuration in Windows in C#?
But they didn't really find a right solution.
Here's my WasapiOut :
var enumerator = new MMDeviceEnumerator();
MMDevice device = enumerator.EnumerateAudioEndPoints(DataFlow.Render, DeviceState.Active).FirstOrDefault(d => d.DeviceFriendlyName == name);
outputDevice = new WasapiOut(device, AudioClientShareMode.Exclusive, false,200);
What I don't understand is that here :
https://github.com/naudio/NAudio/blob/master/Docs/WasapiOut.md
It says that :
"If you choose AudioClientShareMode.Exclusive then you are requesting exclusive access to the sound card. The benefits of this approach are that you can specify the exact sample rate you want"
And I didn't find anywhere how to specify the sample rate.
If someone here know the answer it would be great, thanks !
Edit :
I think I found a way by doing this :
var waveFormat5 = WaveFormat.CreateIeeeFloatWaveFormat(Int32.Parse(comboBox1.Text), 2);
var test2 = new MixingSampleProvider(waveFormat5);
var audioFile = new AudioFileReader("test.wav");
var input = audioFile;
test2.ReadFully = true;
test2.AddMixerInput(new AutoDisposeFileReader(input,waveFormat5));
outputDevice.Init(test2);
With "outputDevice" as my WasapiOut.
So I set the ouputDevice sample rate to the one that I chose with the Mixing Sample Provider and then I send an audiofile to that Mixer, is that the right way to do it ?
Because my audiofile sample rate is at 44100, and I chose to put my outputDevice sample rate to also 44100, but when I make outputDevice.Play(), the sound that I ear is faster than the original.

Once you've created an instance of WasapiOut you call Init passing the audio you want to play. It will try to use the sample rate (and WaveFormat) of that audio directly, assuming the soundcard supports it. Usi

I solved my problem, I used an AudioPlaybackEngine (https://markheath.net/post/fire-and-forget-audio-playback-with) with a MixingSampleProvider, and a try/catch to handle the message error of "the inputs are not a the same sample rate".

How can I set Windows audio balance levels programmatically?

I'm dealing with sound software and I'm setting the default Audio device using nircmd.exe perfectly, but I also need to adjust the balance levels, either using a similar tool (since nircmd.exe doesn't handle that) or programatically using C#.
I've seen NAudio has a read-only property that reads the values
defaultDevice.AudioMeterInformation.PeakValues[0]; //i.e. left channel
But there's no setter for that.
Is there any familiar way to achieve this?
Any help is appreciated, thanks.

Ok, found the answer.
using NAudio.CoreAudioApi;
MMDeviceEnumerator devEnum = new MMDeviceEnumerator();
MMDevice defaultDevice = devEnum.GetDefaultAudioEndpoint(DataFlow.Capture, Role.Communications);
defaultDevice.AudioEndpointVolume.Channels[0].VolumeLevel = 10;
defaultDevice.AudioEndpointVolume.Channels[1].VolumeLevel = 6;

Example VU Meter using Windows Media Graph API?

The question says it all.
I would like to create the simplest possible VU-meter example, using the new UWP Media Graph API, but so far, I haven't found any good examples.
There are a couple of questions in this:
I am using the "normal" code to enumerate my microphones:
var deviceInformation = await DeviceInformation.FindAllAsync(MediaDevice.GetAudioCaptureSelector());
However, when I create an AudioGraphSettings object, I cannot find a property to pass the device found. There is a property named DesiredRenderDeviceAudioProcessing however, I'm not sure I understand it's purpose.
Following the best examples I've found, I proceed to create a graph, and use that to get an InputNode as such:
var creationResult = await AudioGraph.CreateAsync(settings);
if (creationResult.Status != AudioGraphCreationStatus.Success)
return;
_graph = creationResult.Graph;
var inputNodeCreationResult = await _graph.CreateDeviceInputNodeAsync(Windows.Media.Capture.MediaCategory.Media);
if (inputNodeCreationResult.Status != AudioDeviceNodeCreationStatus.Success)
{
DestroyGraph();
return;
}
_inputNode = inputNodeCreationResult.DeviceInputNode;
From here on, I'm running blind. Not finding any good tutorials, examples or documentation to help me.
I am only interested in sound level (dB), not the waveform. Is there anyone that can help me complete this, or point me to some decent documentation?

"Scenario 2: Device Capture" from the Windows Universal Samples - Audio Creation project should provide some guidance. From your code it looks like you're on track. Might just be a case of adding the following:
_frameOutputNode = _graph.CreateFrameOutputNode();
_frameOutputNode.Start();
_graph.QuantumProcessed += Graph_QuantumProcessed;
_graph.Start();
And using the Graph_QuantumProcessed callback to analyse the AudioFrame provided by a call to _frameOutputNode.GetFrame().
Hope it helps.

Play .oni-File on loop in C# / WPF

I'd like to play a previously recordet *.oni-File in C#/WPF. While, with the help of this tutorial I was able to get to RGB- and Depth-Stream to show up on my UI, I don't know how to play an *.oni-file.
The OpenNI page mentions, that I'd just have to "connect" to the file instead of the device, but I can't find the proper piece of code to do so.
The openni::Device class provides an interface to a single physical hardware device (via a driver). It can also provide an interface to a simulated hardware device via a recorded ONI file taken from a physical device.
If connecting to an ONI file instead of a physical device, it is only required that the ONI recording be available on the system running the application, and that the application have read access to this file.
I also found some clues / discussions, but none of it did help much
C# problem with .oni player
OpenNI-dev: Not able to play the skeletonRec.oni
EDIT: I found a way to at least get the recording played using the SamplesConfig.xml. I just inserted the following code into the <ProductionNodes>:
<Recording file="\test.oni" playbackSpeed="1.0"/>
Sadly, that recording crashes to program when it's done playing - I'm now looking for a way to loop the recording...
EDIT 2: Just if anybody should be interested, I'm using those lines to set the recording on loop:
ScriptNode scriptNode;
context = Context.CreateFromXmlFile(path + "\\" + configuration, out scriptNode);
Player p = (Player)context.FindExistingNode(NodeType.Player);
if (p!=null) p.SetRepeat(true); //Make sure it's really a recording.

If anybody should need the code one day - I managed to load the file and play the recording without the need of a config file:
Context context = new Context();
// Add license
License license = new License();
license.Vendor = "vendor";
license.Key = "key";
context.AddLicense(license);
// Open file
context.OpenFileRecordingEx("record.oni");
// Set to repeat
Player p = (Player)context.FindExistingNode(NodeType.Player);
if (p != null) p.SetRepeat(true);

How to use Core Audio API Master Volume Control with a friendly name?

I am using this code provided here.
http://www.codeproject.com/Articles/18520/Vista-Core-Audio-API-Master-Volume-Control
I am trying to control the volume of my application and 1 additional process that my application starts. Is there a way to use this code above as per application instead of master?
Here is the code in the form
MMDeviceEnumerator DevEnum = new MMDeviceEnumerator();
device = DevEnum.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia);
beiVolumControl.EditValue = (int)(device.AudioEndpointVolume.MasterVolumeLevelScalar * 100);
By comments listed there is a way to pick the device using a friendly name but I don't see any examples listed anywhere.
Here is the code used when my volume slider changes
//change the Volume
void ritbVolumeControl_EditValueChanged(object sender, EventArgs e)
{
TrackBarControl trackBar = sender as TrackBarControl;
//only use in vista or above.
if (useAlternateSound == false)
{
device.AudioEndpointVolume.MasterVolumeLevelScalar = ((float)trackBar.Value / 100.0f);
}
else
{
//probably using xp or lower.
}
// MessageBox.Show(trackBar.Value.ToString());
}
The End Goal is to Control my Application and one other process's volume if it's possible without controlling the master volume of all applications. So I can mute them and still use skype voice chat for an example. Am I going about this the wrong way?
Thanks.