如何在UWP应用程序中将SpeechSynthesis音频保存到Mp3文件中

Question

我正在开发UWP TTS（文本到语音）应用程序，但在将语音保存到文件（最好是Mp3格式）时遇到了麻烦。有谁知道如何做到这一点？在WPF中，我使用了NAUDIO和NAUDIO.LAME，但是不幸的是，这似乎不支持UWP。我认为我必须使用Windows.Media.Transcoding API，但是我没有找到任何执行此操作的示例。我在MSDN上的一篇文章中找到了下面的代码，但这是不正确的。

        StorageFile file = await savePicker.PickSaveFileAsync();
        if (file != null)
        {
            try
            {
                SpeechSynthesisStream stream = await WCSVariables.Synthesizer.SynthesizeTextToStreamAsync(rtbText.Text);

                using (var reader = new DataReader(stream))
                {
                    await reader.LoadAsync((uint)stream.Size);
                    IBuffer buffer = reader.ReadBuffer((uint)stream.Size);
                    await FileIO.WriteBufferAsync(file, buffer);
                }


            }
            catch (Exception ex)
            {
                MessageDialog msgdlg = new MessageDialog(ex.Message);
                msgdlg.ShowAsync();
            }

**********更新**********

添加了TXT和MP3的功能和文件类型关联之后，我能够将TXT文件保存在任何文件夹中，但是MP3文件的格式不正确。文件已创建但不播放音频。

FileSavePicker savePicker = new FileSavePicker();
        savePicker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;
        savePicker.FileTypeChoices.Add("Mp3 Audio File", new List<string>() { ".mp3" });
        savePicker.FileTypeChoices.Add("Plain Text", new List<string>() { ".txt" });
        savePicker.SuggestedFileName = "New Document";

        StorageFile file = await savePicker.PickSaveFileAsync();
        if (file != null)
        {
            try
            {
                if (file.FileType == ".txt")
                {
                    await FileIO.WriteTextAsync(file, rtbText.Text);
                }
                else
                {
                    string path = file.Path.Remove(file.Path.IndexOf(file.Name), file.Name.Length);

                    StorageFolder mp3Folder = await StorageFolder.GetFolderFromPathAsync(path);
                    StorageFile mp3File = await mp3Folder.CreateFileAsync(file.Name, CreationCollisionOption.ReplaceExisting);
                    SpeechSynthesisStream stream = await WCSVariables.Synthesizer.SynthesizeTextToStreamAsync(rtbText.Text);

                    using (var reader = new DataReader(stream))
                    {
                        await reader.LoadAsync((uint)stream.Size);
                        IBuffer buffer = reader.ReadBuffer((uint)stream.Size);
                        await FileIO.WriteBufferAsync(mp3File, buffer);
                    }
                }
            } 
            catch (Exception ex)
            {
                MessageDialog msgdlg = new MessageDialog(ex.Message);
                msgdlg.ShowAsync();
            }
        }

Answer 1

您可以首先创建一个.mp3文件，然后从基本文本字符串生成语音音频流。之后，将流写入文件。

StorageFolder folder = KnownFolders.VideosLibrary;
StorageFile file = await folder.CreateFileAsync("MyVideo.mp3",CreationCollisionOption.ReplaceExisting);
if (file != null)
{
    try
    {
        var synth = new Windows.Media.SpeechSynthesis.SpeechSynthesizer();
        SpeechSynthesisStream stream = await synth.SynthesizeTextToStreamAsync("Hello World");

        using (var reader = new DataReader(stream))
        {
            await reader.LoadAsync((uint)stream.Size);
            IBuffer buffer = reader.ReadBuffer((uint)stream.Size);
            await FileIO.WriteBufferAsync(file, buffer);
        }
    }
    catch {}
}