使用 AudioVideoCaptureDevice 在 Windows Phone 8 上录制 PCM

本文关键字：PCM Phone AudioVideoCaptureDevice Windows 使用 | 更新日期: 2023-09-27 17:57:14

以下代码使用 AMR 和 AAC 格式正确地将从我的 Windows Phone 8 设备录制的音频记录到独立存储中。但是，当我尝试记录PCM格式时，应用程序崩溃并显示错误：

    Value does not fall within the expected range.
Windows.Phone.Media.Capture.AudioVideoCaptureDevice.StartRecordingToStreamAsync(IRandomAccessStream stream)
       at WP8.Classes.AudioCaptureController.<StartRecordingAsync>d__3.MoveNext()
    --- End of stack trace from previous location where exception was thrown ---
       at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
       at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
       at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
       at WP8.ViewModels.CameraPageViewModel.<capture>d__13.MoveNext()
    --- End of stack trace from previous location where exception was thrown ---
       at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
       at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
       at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
       at WP8.ViewModels.CameraPageViewModel.<TakePictureAsync>d__6.MoveNext()
    --- End of stack trace from previous location where exception was thrown ---
       at System.Runtime.CompilerServices.AsyncMethodBuilderCore.<ThrowAsync>b__0(Object state)

我工作的代码如下：

private AudioVideoCaptureDevice mic;
    private IRandomAccessStream sst;
    private string path;
    public async Task MicStartAsync()
    {
      mic = await AudioVideoCaptureDevice.OpenForAudioOnlyAsync();
      mic.AudioEncodingFormat = CameraCaptureAudioFormat.Pcm;
    }
    public async Task StartRecordingAsync()
    {
      IsolatedStorageAccess iso = new IsolatedStorageAccess();
      sst = await iso.SetUpFileStreamForSavingAudioAsync("123.pcm");
      await mic.StartRecordingToStreamAsync(sst);
      path = iso.Path;
    }
    public async Task StopRecordingAsync()
    {
      await mic.StopRecordingAsync();
      sst.AsStream().Dispose();
      new MediaPlayerLauncher()
      {
        Media = new Uri(path, UriKind.Relative)
      }.Show();
    }
  }
}

将格式更改为PCM以外的任何格式都可以工作！

更新：由于某种原因，它现在似乎避免了崩溃，但这显示在输出中：

A first chance exception of type 'System.ArgumentException' occurred in WP8.DLL
An exception of type 'System.ArgumentException' occurred in WP8.DLL and wasn't handled before a managed/native boundary

（WP8是我的dll的名字）在此之后，代码照常进行，并且仅在我停止录制时崩溃，它说录制从未开始并且AudioVideoCaptureDevice处于不正确的状态

我还尝试使用var AudioVideoCaptureDevice.SupportedAudioEncodingFormats;来检查PCM是否可用

使用 AudioVideoCaptureDevice 在 Windows Phone 8 上录制 PCM

您可以使用XNA框架从麦克风录制（似乎微软在将数据写入文件时框架中存在错误！

看看这个代码麦克风示例和这篇文章，用于将数据保存为 wav 格式 将麦克风流保存为 Windows Phone 中的波形格式 从诺基亚开发人员门户！

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