NAudio与SpeechSynthesizer的结合

Question

我想将NAudio与SpeechSynthesizer一起使用，但如果不首先将.wav文件写入磁盘，则无法使其工作。

我不知道为什么，我尝试了原始波浪数据和波浪与标头，请参阅以下例子.

示例1-此操作有效，但保存了一个.wav文件。

  using (var synth = new SpeechSynthesizer())
  {
    synth.SetOutputToWaveFile(@".\Test.wav");
    synth.Speak("This is sample text-to-speech output.");
    synth.SetOutputToNull();

    var reader = new WaveFileReader(@".\Test.wav");
    var waveOut = new WaveOut();
    waveOut.Init(reader);
    waveOut.Play();
  }

示例2-这同样有效，但仍然使用文件

  using (var synth = new SpeechSynthesizer())
  using (var stream = new MemoryStream())
  {
    synth.SetOutputToWaveStream(stream);
    synth.Speak("This is sample text-to-speech output.");

    using (var fileStream = File.Create(@".\Test.wav"))
    {
      stream.Seek(0, SeekOrigin.Begin);
      stream.CopyTo(fileStream);
    }

    var reader = new WaveFileReader(@".\Test.wav");
    var waveOut = new WaveOut();
    waveOut.Init(reader);
    waveOut.Play();
  }

示例3-这不起作用，它只是播放了一小部分秒并停止了

为了避免设置波形格式，我故意使用SetOutputToWaveStream来保留RIFF头。

    using (var synth = new SpeechSynthesizer())
    using (var stream = new MemoryStream())
    {
      synth.SetOutputToWaveStream(stream);
      synth.Speak("This is sample text-to-speech output.");

      stream.Seek(0, SeekOrigin.Begin);
      var reader = new WaveFileReader(stream);
      var waveOut = new WaveOut();
      waveOut.Init(reader);
      waveOut.Play();
    }

示例4-结果与示例3相同

它使用原始数据，有点笨重。

  using (var synth = new SpeechSynthesizer())
  using (var stream = new MemoryStream())
  {
    synth.SetOutputToAudioStream(stream, new SpeechAudioFormatInfo(44100, AudioBitsPerSample.Sixteen, AudioChannel.Mono));
    synth.Speak("This is sample text-to-speech output.");

    stream.Seek(0, SeekOrigin.Begin);
    IWaveProvider provider = new RawSourceWaveStream(stream, new WaveFormat(44100, 16, 1));
    var waveOut = new WaveOut();
    waveOut.Init(provider);
    waveOut.Play();
  }

我也尝试过使用WasapiOut，但这更糟糕。

Answer 1

在重新定位到开始之前，请在内存流上调用Flush。而且，Play只开始播放，所以您需要等待播放完成，或者将WaveOut实例移动到using块之外。否则，它只会收集垃圾，然后才能很好地回放。

Answer 2

这段代码适用于我，如果可以帮助(对于解决方案3)。

        IWaveProvider provider = null;
        var stream = new MemoryStream();
        using (var synth = new SpeechSynthesizer())
        {

            synth.SetOutputToAudioStream(stream,
                new SpeechAudioFormatInfo(44100, AudioBitsPerSample.Sixteen, AudioChannel.Mono));
            synth.Speak("This is sample text-to-speech output.");

            stream.Seek(0, SeekOrigin.Begin);
            provider = new RawSourceWaveStream(stream, new WaveFormat(44100, 16, 1));

        }
        var waveOut = new WaveOut();
        waveOut.Init(provider);
        waveOut.Play();