录制/捕获当前播放的音频 [英] Recording/Capture Currently Playing Audio

问题描述

我想在 UWP 或 Windows Phone 8.1 中捕获/录制当前播放的音频，同样的事情由其应用程序中的MEE dj"UWP 应用程序完成，该应用程序能够捕获应用程序中当前播放的音频.任何人都知道，请分享您的答案.

i want to capture/record currently playback audio in UWP or Windows Phone 8.1 any, same thing is done by "MEE dj" UWP app in its app, that app is ability to capture currently playing audio in the app. Anyone know about that share your answer please.

推荐答案

如何设置输入节点播放音乐而不是麦克风

how to set input nodes playback music instead of mic

Windows.Media.音频命名空间包含AudioDeviceInputNode、AudioDeviceOutputNode、AudioFileInputNode、AudioFileOutputNode等.麦克风输入是AudioDeviceInputNode，但播放音乐文件需要使用AudioFileInputNode.

Windows.Media.Audio namespace contains AudioDeviceInputNode,AudioDeviceOutputNode,AudioFileInputNode,AudioFileOutputNode and so on. Mic for input is AudioDeviceInputNode, but for play back music file you need to use AudioFileInputNode.

好的，但是我如何捕获该音频并将其保存到存储中

OKay but how can i capture that audio and save it to storage

为了像我上面所说的那样保存到存储中，我们需要使用 AudioFileOutputNode.这是一个简单的演示，您可以加载一个文件进行录音，并从存储中选择一个文件来保存录音结果.代码如下:

For saving to storage as I said above, we need to use AudioFileOutputNode. Here is a simple demo, you can load a file for recording, and choose a file from storage for saving the recording result. Code as follows:

XAML 代码

<StackPanel Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" Padding="50">
    <TextBlock x:Name="txtresult" ></TextBlock>
    <Button x:Name="fileButton" Content="Load audio File for recording" Click="File_Click" MinWidth="120" MinHeight="45" Margin="0,20,0,0"/>
    <Button x:Name="OutpuyfileButton" Content="Load output File for save the recording result" Click="OutpuyfileButton_Click" MinWidth="120" MinHeight="45" Margin="0,20,0,0"/>
    <Button x:Name="graphButton" Content="Start playing" Click="Graph_Click" MinWidth="120" MinHeight="45" Margin="0,50,0,20"/>
    <Button x:Name="graphrecord" Content="Begin recording" Click="graphrecord_Click" ></Button>
</StackPanel>

背后的代码

  private AudioFileInputNode fileInput;
  private AudioFileOutputNode fileOutputNode;
  private AudioDeviceOutputNode deviceOutput;
  private AudioGraph graph;

  StorageFile outputfile;

  public MainPage()
  {
      this.InitializeComponent();
  }
  protected override async void OnNavigatedTo(NavigationEventArgs e)
  {
      await CreateAudioGraph();
  }
  private async Task CreateAudioGraph()
  {
      // Create an AudioGraph with default settings
      AudioGraphSettings settings = new AudioGraphSettings(AudioRenderCategory.Media);
      CreateAudioGraphResult result = await AudioGraph.CreateAsync(settings);
      if (result.Status != AudioGraphCreationStatus.Success)
      {
          // Cannot create graph
          await new MessageDialog(String.Format("AudioGraph Creation Error because {0}", result.Status.ToString())).ShowAsync();
          return;
      }
      graph = result.Graph;
      // Create a device output node
      CreateAudioDeviceOutputNodeResult deviceOutputNodeResult = await graph.CreateDeviceOutputNodeAsync();
      if (deviceOutputNodeResult.Status != AudioDeviceNodeCreationStatus.Success)
      {
          // Cannot create device output node
        txtresult.Text+="\n"+ String.Format("Device Output unavailable because {0}", deviceOutputNodeResult.Status.ToString());
          return;
      }
      deviceOutput = deviceOutputNodeResult.DeviceOutputNode;
      txtresult.Text += "\n" + "Device Output Node successfully created";
  }
  private async void File_Click(object sender, RoutedEventArgs e)
  {
      // If another file is already loaded into the FileInput node
      if (fileInput != null)
      {
          fileInput.Dispose();
      }
      FileOpenPicker filePicker = new FileOpenPicker();
      filePicker.SuggestedStartLocation = PickerLocationId.MusicLibrary;
      filePicker.FileTypeFilter.Add(".mp3");
      filePicker.FileTypeFilter.Add(".wav");
      filePicker.FileTypeFilter.Add(".wma");
      filePicker.FileTypeFilter.Add(".m4a");
      filePicker.ViewMode = PickerViewMode.Thumbnail;
      StorageFile file = await filePicker.PickSingleFileAsync();
      // File can be null if cancel is hit in the file picker
      if (file == null)
      {
          return;
      }
      CreateAudioFileInputNodeResult fileInputResult = await graph.CreateFileInputNodeAsync(file);
      if (AudioFileNodeCreationStatus.Success != fileInputResult.Status)
      {
          // Cannot read input file
          await new MessageDialog(String.Format("Cannot read input file because {0}", fileInputResult.Status.ToString())).ShowAsync();
          return;
      }

      fileInput = fileInputResult.FileInputNode;
      txtresult.Text += "\n" + "File load successfully,input nodes created";
  }

  private void Graph_Click(object sender, RoutedEventArgs e)
  {
      if (graphButton.Content.Equals("Start playing"))
      {
          fileInput.AddOutgoingConnection(deviceOutput);
          graph.Start();            
          graphButton.IsEnabled = false;
      }
  }

  private async void OutpuyfileButton_Click(object sender, RoutedEventArgs e)
  {
      FileSavePicker saveFilePicker = new FileSavePicker();
      saveFilePicker.FileTypeChoices.Add("Pulse Code Modulation", new List<string>() { ".wav" });
      saveFilePicker.FileTypeChoices.Add("Windows Media Audio", new List<string>() { ".wma" });
      saveFilePicker.FileTypeChoices.Add("MPEG Audio Layer-3", new List<string>() { ".mp3" });
      saveFilePicker.SuggestedFileName = "New Audio Track";
      outputfile = await saveFilePicker.PickSaveFileAsync();
      // File can be null if cancel is hit in the file picker
      if (outputfile == null)
      {
          return;
      }

      txtresult.Text +="\n"+ String.Format("Recording to {0}", outputfile.Name.ToString());
  }
  private MediaEncodingProfile CreateMediaEncodingProfile(StorageFile file)
  {
      switch (file.FileType.ToString().ToLowerInvariant())
      {
          case ".wma":
              return MediaEncodingProfile.CreateWma(AudioEncodingQuality.High);
          case ".mp3":
              return MediaEncodingProfile.CreateMp3(AudioEncodingQuality.High);
          case ".wav":
              return MediaEncodingProfile.CreateWav(AudioEncodingQuality.High);
          default:
              throw new ArgumentException();
      }
  }

  private async void graphrecord_Click(object sender, RoutedEventArgs e)
  {
      if (graphrecord.Content.Equals("Begin recording"))
      {
          MediaEncodingProfile fileProfile = CreateMediaEncodingProfile(outputfile);
          CreateAudioFileOutputNodeResult fileOutputNodeResult = await graph.CreateFileOutputNodeAsync(outputfile, fileProfile);
          if (fileOutputNodeResult.Status != AudioFileNodeCreationStatus.Success)
          {
              // FileOutputNode creation failed
              await new MessageDialog(String.Format("Cannot create output file because {0}", fileOutputNodeResult.Status.ToString())).ShowAsync();
              return;
          }
          fileOutputNode = fileOutputNodeResult.FileOutputNode;
          fileInput.AddOutgoingConnection(fileOutputNode);
          graphrecord.Content = "Stop recording";
      }
      else
      {
          graph.Stop();
          TranscodeFailureReason finalizeResult = await fileOutputNode.FinalizeAsync();
          if (finalizeResult != TranscodeFailureReason.None)
          {
              // Finalization of file failed. Check result code to see why
              await new MessageDialog(String.Format("Finalization of file failed because {0}", finalizeResult.ToString())).ShowAsync();
              return;
          }
          txtresult.Text += "\n" + "Recording completed";
          graphrecord.IsEnabled = false;
      }
  }

其他复杂功能请参考官方样例.

For other complex features, please still reference the official sample.

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