257 lines
10 KiB
C#
257 lines
10 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.IO;
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using System.Linq;
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using System.Runtime.InteropServices.WindowsRuntime;
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using System.Threading.Tasks;
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using Windows.Devices.Enumeration;
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using Windows.Foundation;
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using Windows.Foundation.Collections;
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using Windows.Media;
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using Windows.Media.Audio;
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using Windows.Media.Capture;
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using Windows.Media.Devices;
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using Windows.Media.Playback;
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using Windows.Media.Render;
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using Windows.UI.Core;
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using Windows.UI.Xaml;
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using Windows.UI.Xaml.Controls;
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using Windows.UI.Xaml.Controls.Primitives;
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using Windows.UI.Xaml.Data;
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using Windows.UI.Xaml.Documents;
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using Windows.UI.Xaml.Input;
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using Windows.UI.Xaml.Media;
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using Windows.UI.Xaml.Navigation;
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// The Blank Page item template is documented at https://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x409
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namespace Audio_Router
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{
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/// <summary>
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/// An empty page that can be used on its own or navigated to within a Frame.
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/// </summary>
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public sealed partial class MainPage : Page
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{
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//AudioGraph graph;
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// The list of audio devices
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DeviceInformationCollection sourceDevices;
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DeviceInformationCollection targetDevices;
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public MainPage()
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{
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this.InitializeComponent();
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App.appRef.Suspending += AppRef_Suspending;
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App.appRef.Resuming += AppRef_Resuming;
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App.appRef.EnteredBackground += AppRef_EnteredBackground;
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App.appRef.LeavingBackground += AppRef_LeavingBackground;
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}
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private void AppRef_LeavingBackground(object sender, Windows.ApplicationModel.LeavingBackgroundEventArgs e)
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{
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if (IsLoaded)
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{
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BackgroundRestore();
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}
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}
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private void AppRef_EnteredBackground(object sender, Windows.ApplicationModel.EnteredBackgroundEventArgs e)
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{
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BackgroundCleanup();
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}
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private void AppRef_Resuming(object sender, object e)
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{
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BackgroundRestore();
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}
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/// <summary>
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/// Clear existing elements from this display, to free memory
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/// </summary>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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private void AppRef_Suspending(object sender, Windows.ApplicationModel.SuspendingEventArgs e)
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{
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BackgroundCleanup();
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}
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private void BackgroundCleanup()
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{
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// Clear all items from the lists
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InputAudioComboBox.Items.Clear();
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OutputAudioComboBox.Items.Clear();
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CreatedGraphs.Children.Clear();
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// Ensure the GC collects freed memory, by explicitly calling the GC
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GC.Collect();
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}
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private void BackgroundRestore()
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{
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// Start the task that populates the lists
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if (InputAudioComboBox.Items.Count > 0 || OutputAudioComboBox.Items.Count > 0) return;
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_ = Task.Run(() => FindAudioSources());
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// And add existing graphs back to the page
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foreach (AudioGraphConnection graphConneciton in App.appRef.audioGraphConnections)
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{
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Grid renderGrid = graphConneciton.GetAsDisplayItem(out Button visualButton);
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CreatedGraphs.Children.Add(renderGrid);
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void handler(object sender, RoutedEventArgs e)
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{
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visualButton.Click -= handler;
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DestroyVisualElement(ref renderGrid);
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}
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visualButton.Click += handler;
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}
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}
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/// <summary>
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/// When the page is navigated to, populate the list
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/// </summary>
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/// <param name="e"></param>
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protected override void OnNavigatedTo(NavigationEventArgs e)
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{
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// Populate audio device list; as a Task to avoid delaying creation
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_ = Task.Run(() => FindAudioSources());
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}
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private async Task FindAudioSources()
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{
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// First, clear the lists
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_ = Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
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{
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InputAudioComboBox.Items.Clear();
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OutputAudioComboBox.Items.Clear();
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});
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// Perform this on our spawned thread, as the operation is asynchronous-synchronous await
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sourceDevices = await DeviceInformation.FindAllAsync(MediaDevice.GetAudioCaptureSelector());
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targetDevices = await DeviceInformation.FindAllAsync(MediaDevice.GetAudioRenderSelector());
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DeviceInformation defaultOutput = await DeviceInformation.CreateFromIdAsync(MediaDevice.GetDefaultAudioRenderId(AudioDeviceRole.Default));
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DeviceInformation defaultInput = await DeviceInformation.CreateFromIdAsync(MediaDevice.GetDefaultAudioCaptureId(AudioDeviceRole.Default));
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_ = Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
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{
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// Set the Input device
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for (int i = 0; i < sourceDevices.Count; i++)
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{
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if (sourceDevices[i].Id == defaultInput.Id)
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{
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InputAudioComboBox.Items.Add(sourceDevices[i].Name + " (Default Device)");
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InputAudioComboBox.SelectedIndex = i;
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}
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else
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{
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InputAudioComboBox.Items.Add(sourceDevices[i].Name);
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}
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}
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for (int i = 0; i < targetDevices.Count; i++)
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{
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if(targetDevices[i].Id == defaultOutput.Id)
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{
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OutputAudioComboBox.Items.Add(targetDevices[i].Name + " (Default Device)");
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OutputAudioComboBox.SelectedIndex = i;
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}
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else
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{
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OutputAudioComboBox.Items.Add(targetDevices[i].Name);
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}
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}
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});
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}
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private async void startStreamButton_Click(object sender, RoutedEventArgs e)
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{
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await CreateAudioGraph();
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}
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private async Task CreateAudioGraph()
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{
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App.displayRequest.RequestActive();
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DeviceInformation outputDevice = targetDevices[OutputAudioComboBox.SelectedIndex];
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DeviceInformation inputDevice = sourceDevices[InputAudioComboBox.SelectedIndex];
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AudioGraphSettings settings = LowLatencyCheckbox.IsChecked == true
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? new AudioGraphSettings(AudioRenderCategory.Media)
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{
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QuantumSizeSelectionMode = QuantumSizeSelectionMode.ClosestToDesired,
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DesiredSamplesPerQuantum = 10,
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PrimaryRenderDevice = outputDevice,
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DesiredRenderDeviceAudioProcessing = Windows.Media.AudioProcessing.Raw,
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EncodingProperties = new Windows.Media.MediaProperties.AudioEncodingProperties()
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{
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Subtype = "Float",
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SampleRate = 128000, // Manually set to 128 000 samples/second so that the delay is significantly reduced
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ChannelCount = 2,
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BitsPerSample = 32,
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Bitrate = 3072000
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}
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}
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: new AudioGraphSettings(AudioRenderCategory.Media)
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{
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PrimaryRenderDevice = outputDevice
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};
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CreateAudioGraphResult result = await AudioGraph.CreateAsync(settings);
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AudioGraph ag = result.Graph;
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if (result.Status != AudioGraphCreationStatus.Success)
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{
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return;
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}
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CreateAudioDeviceInputNodeResult deviceInputNodeResult = await ag.CreateDeviceInputNodeAsync(MediaCategory.Other, ag.EncodingProperties, inputDevice);
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if (deviceInputNodeResult.Status != AudioDeviceNodeCreationStatus.Success)
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{
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// Fail-safe, switch to using the default encoding properties
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settings = new AudioGraphSettings(AudioRenderCategory.Media)
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{
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PrimaryRenderDevice = outputDevice
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};
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result = await AudioGraph.CreateAsync(settings);
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ag = result.Graph;
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if (result.Status != AudioGraphCreationStatus.Success)
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{
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return;
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}
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deviceInputNodeResult = await ag.CreateDeviceInputNodeAsync(MediaCategory.Other, ag.EncodingProperties, inputDevice);
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if (deviceInputNodeResult.Status != AudioDeviceNodeCreationStatus.Success)
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{
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return;
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}
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}
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// Create the device output node connection
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CreateAudioDeviceOutputNodeResult deviceOutputNodeResult = await ag.CreateDeviceOutputNodeAsync();
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if (deviceOutputNodeResult.Status != AudioDeviceNodeCreationStatus.Success)
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{
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return;
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}
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deviceInputNodeResult.DeviceInputNode.AddOutgoingConnection(deviceOutputNodeResult.DeviceOutputNode);
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// appMediaControls.PlaybackStatus = MediaPlaybackStatus.Playing;
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ag.Start();
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AudioGraphConnection graphConnection = new AudioGraphConnection(ag, deviceOutputNodeResult.DeviceOutputNode, deviceInputNodeResult.DeviceInputNode, Dispatcher);
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App.appRef.audioGraphConnections.Add(graphConnection);
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// Hold a reference to the created button; when clicked we must also ensure we remove this visual element from the grid display
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Grid renderGrid = graphConnection.GetAsDisplayItem(out Button visualButton);
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CreatedGraphs.Children.Add(renderGrid);
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// Inline decl to add a second listener to the click event - will remove the grid from the display
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void handler(object sender, RoutedEventArgs e)
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{
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visualButton.Click -= handler;
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DestroyVisualElement(ref renderGrid);
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}
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visualButton.Click += handler;
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}
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private void DestroyVisualElement(ref Grid element)
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{
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_ = CreatedGraphs.Children.Remove(element);
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element = null;
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}
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}
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}
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