RecognizedAudio.WriteToWaveStream(Stream) 方法

定义

命名空间:

System.Speech.Recognition

程序集:

System.Speech.dll

包:

System.Speech v9.0.0-rc.2.24473.5

Source:

RecognizedAudio.cs

编写音频定向到波形格式的流。

public:
 void WriteToWaveStream(System::IO::Stream ^ outputStream);

public void WriteToWaveStream (System.IO.Stream outputStream);

member this.WriteToWaveStream : System.IO.Stream -> unit

Public Sub WriteToWaveStream (outputStream As Stream)

参数

outputStream

Stream

将接收经过音频数据的流。

示例

以下示例为名称输入创建语音识别语法，为 SpeechRecognized 事件添加处理程序，并将语法加载到进程内语音识别器中。 然后，它将输入的名称部分的音频信息写入音频文件。 音频文件用作对象的输入 SpeechSynthesizer ，该对象说出包含录制的音频的短语。

private static void AddNameGrammar(SpeechRecognitionEngine recognizer)  
{  
  GrammarBuilder builder = new GrammarBuilder();  
  builder.Append("My name is");  
  builder.AppendWildcard();  

  Grammar nameGrammar = new Grammar(builder);  
  nameGrammar.Name = "Name Grammar";  
  nameGrammar.SpeechRecognized +=  
    new EventHandler<SpeechRecognizedEventArgs>(  
      NameSpeechRecognized);  

  recognizer.LoadGrammar(nameGrammar);  
}  

// Handle the SpeechRecognized event of the name grammar.  
private static void NameSpeechRecognized(  
  object sender, SpeechRecognizedEventArgs e)  
{  
  Console.WriteLine("Grammar ({0}) recognized speech: {1}",  
    e.Result.Grammar.Name, e.Result.Text);  

  try  
  {  
    // The name phrase starts after the first three words.  
    if (e.Result.Words.Count < 4)  
    {  

      // Add code to check for an alternate that contains the   
wildcard.  
      return;  
    }  

    RecognizedAudio audio = e.Result.Audio;  
    TimeSpan start = e.Result.Words[3].AudioPosition;  
    TimeSpan duration = audio.Duration - start;  

    // Add code to verify and persist the audio.  
    string path = @"C:\temp\nameAudio.wav";  
    using (Stream outputStream = new FileStream(path, FileMode.Create))  
    {  
      RecognizedAudio nameAudio = audio.GetRange(start, duration);  
      nameAudio.WriteToWaveStream(outputStream);  
      outputStream.Close();  
    }  

    Thread testThread =  
      new Thread(new ParameterizedThreadStart(TestAudio));  
    testThread.Start(path);  
  }  
  catch (Exception ex)  
  {  
    Console.WriteLine("Exception thrown while processing audio:");  
    Console.WriteLine(ex.ToString());  
  }  
}  

// Use the speech synthesizer to play back the .wav file  
// that was created in the SpeechRecognized event handler.  

private static void TestAudio(object item)  
{  
  string path = item as string;  
  if (path != null && File.Exists(path))  
  {  
    SpeechSynthesizer synthesizer = new SpeechSynthesizer();  
    PromptBuilder builder = new PromptBuilder();  
    builder.AppendText("Hello");  
    builder.AppendAudio(path);  
    synthesizer.Speak(builder);  
  }  
}  

注解

音频数据以 Wave 格式写入 outputStream ，其中包括资源交换文件格式 (RIFF) 标头。

方法 WriteToAudioStream 使用相同的二进制格式，但不包括 Wave 标头。

另请参阅

• GetRange(TimeSpan, TimeSpan)
• WriteToAudioStream(Stream)