Recording/Capture 当前正在播放音频
Recording/Capture Currently Playing Audio
我想 capture/record 当前在 UWP 或 Windows Phone 8.1 中播放音频，"MEE dj" UWP 应用程序在其应用程序中完成同样的事情，那个应用程序能够捕获应用程序中当前正在播放的音频。
请知道的人分享您的答案。
您可以使用 Windows.Media.Audio namespace to create audio graphs for audio routing, mixing, and processing scenarios. For how to create audio graphs please reference this article 中的 API。
音频图是一组相互连接的音频节点。您要录制的音频文件提供 "audio input nodes"，"audio output nodes" 是图形处理的音频的目的地，音频可以从图形路由到目标音频文件。在"MeeDJ" windows 商店应用程序中，它可以混合两个音频并将其录制为一个。在这种情况下，我们可以使用 "submix nodes" 从一个或多个节点获取音频并将它们组合成一个输出。
对于开始和停止录制，我们可以尝试像 "MeeDJ" 那样使用 Starting and stopping audio graph nodes to implement. You can also try to Adding audio effects。
更多功能和示例代码请参考official sample.
how to set input nodes playback music instead of mic
Windows.Media.Audio namespace包含AudioDeviceInputNode、AudioDeviceOutputNode、AudioFileInputNode、AudioFileOutputNode等。输入麦克风为AudioDeviceInputNode，但播放音乐文件需要使用AudioFileInputNode.
OKay but how can i capture that audio and save it to storage
如我上面所说的保存到存储，我们需要使用AudioFileOutputNode。这里有一个简单的demo，可以加载一个文件进行录音，从storage中选择一个文件保存录音结果。代码如下：
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>
代码隐藏
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;
}
}
其他复杂的特征，仍请参考官方示例
我想 capture/record 当前在 UWP 或 Windows Phone 8.1 中播放音频，"MEE dj" UWP 应用程序在其应用程序中完成同样的事情，那个应用程序能够捕获应用程序中当前正在播放的音频。 请知道的人分享您的答案。
您可以使用 Windows.Media.Audio namespace to create audio graphs for audio routing, mixing, and processing scenarios. For how to create audio graphs please reference this article 中的 API。
音频图是一组相互连接的音频节点。您要录制的音频文件提供 "audio input nodes"，"audio output nodes" 是图形处理的音频的目的地，音频可以从图形路由到目标音频文件。在"MeeDJ" windows 商店应用程序中，它可以混合两个音频并将其录制为一个。在这种情况下，我们可以使用 "submix nodes" 从一个或多个节点获取音频并将它们组合成一个输出。
对于开始和停止录制，我们可以尝试像 "MeeDJ" 那样使用 Starting and stopping audio graph nodes to implement. You can also try to Adding audio effects。
更多功能和示例代码请参考official sample.
how to set input nodes playback music instead of mic
Windows.Media.Audio namespace包含AudioDeviceInputNode、AudioDeviceOutputNode、AudioFileInputNode、AudioFileOutputNode等。输入麦克风为AudioDeviceInputNode，但播放音乐文件需要使用AudioFileInputNode.
OKay but how can i capture that audio and save it to storage
如我上面所说的保存到存储，我们需要使用AudioFileOutputNode。这里有一个简单的demo，可以加载一个文件进行录音，从storage中选择一个文件保存录音结果。代码如下：
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>
代码隐藏
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;
}
}
其他复杂的特征，仍请参考官方示例