如何在UWP应用程序中将SpeechSynthesis音频保存为Mp3文件

using Windows.Media.SpeechSynthesis;

SpeechSynthesizer synthesizer = new SpeechSynthesizer();

// 设置语言
synthesizer.Voice = SpeechSynthesizer.AllVoices.First(x => x.Language == "en-US");

// 设置声音
synthesizer.Options.SpeakingRate = 1.0;

// 设置音量
synthesizer.Options.Volume = 1.0;

SpeechSynthesisStream stream = await synthesizer.SynthesizeTextToStreamAsync("要转换为音频的文本");

Windows.Storage.StorageFolder storageFolder = Windows.Storage.ApplicationData.Current.LocalFolder;
Windows.Storage.StorageFile mp3File = await storageFolder.CreateFileAsync("output.mp3", Windows.Storage.CreationCollisionOption.GenerateUniqueName);

using (Windows.Storage.Streams.IRandomAccessStream outputStream = await mp3File.OpenAsync(Windows.Storage.FileAccessMode.ReadWrite))
{
    await Windows.Media.Core.MediaEncodingProfile.CreateMp3(Windows.Media.MediaProperties.AudioEncodingQuality.High).CreateTranscodeAsync(stream, outputStream);
}