使用NAudio

Question

我正在创建一个简单的WinForms语音到文本应用程序。此应用程序使用NAudio API侦听麦克风，并将音频发送到Google Cloud Speech API。当Google Cloud Speech API使用文本进行响应时，我会将该文本附加到TextBox。请参阅以下代码：

async private void WaveIn_DataAvailable(object sender, WaveInEventArgs e)
{
    await Task.Factory.StartNew(()=> { WriteToTextBox(e.Buffer); }, TaskCreationOptions.LongRunning);
}
void WriteToTextBox(byte[] bufferData)
{
    var speech = SpeechClient.Create();
    var response = speech.Recognize(new RecognitionConfig()
    {
        Encoding = RecognitionConfig.Types.AudioEncoding.Linear16,
        SampleRateHertz = 16000,
        LanguageCode = "en",
    }, RecognitionAudio.FromBytes(bufferData));

    foreach (var result in response.Results)
    {
        foreach (var alternative in result.Alternatives)
        {
            textBox1.Text = textBox1.Text + " " + alternative.Transcript;
        }
    }
}

除了response.Results总是为空的东西外，一切正常。但是，当我将此缓冲区数据保存到文件，然后使用以下代码调用Google Cloud Speech API时：

var response = speech.Recognize(new RecognitionConfig()
            {
                Encoding = RecognitionConfig.Types.AudioEncoding.Linear16,
                SampleRateHertz = 16000,
                LanguageCode = "en",
            }, RecognitionAudio.FromFile("audio.raw"));

工作正常。