SpeechRecognitionEngine.SetInputToWaveFile(String) Method

Definition

Namespace:

System.Speech.Recognition

Assembly:

System.Speech.dll

Package:

System.Speech v10.0.0-preview.1.25080.5

Source:

SpeechRecognitionEngine.cs

Configures the SpeechRecognitionEngine object to receive input from a Waveform audio format (.wav) file.

C#

public void SetInputToWaveFile(string path);

Parameters

path

String

The path of the file to use as input.

Examples

The following example performs recognition on the audio in a .wav file and writes the recognized text to the console.

using System;  
using System.IO;  
using System.Speech.Recognition;  
using System.Speech.AudioFormat;  

namespace SampleRecognition  
{  
  class Program  
  {  
    static bool completed;  

    static void Main(string[] args)  

    // Initialize an in-process speech recognition engine.  
    {  
      using (SpeechRecognitionEngine recognizer =  
         new SpeechRecognitionEngine())  
      {  

        // Create and load a grammar.  
        Grammar dictation = new DictationGrammar();  
        dictation.Name = "Dictation Grammar";  

        recognizer.LoadGrammar(dictation);  

        // Configure the input to the recognizer.  
recognizer.SetInputToWaveFile(@"c:\temp\SampleWAVInput.wav");  

        // Attach event handlers for the results of recognition.  
        recognizer.SpeechRecognized +=   
          new EventHandler<SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);  
        recognizer.RecognizeCompleted +=   
          new EventHandler<RecognizeCompletedEventArgs>(recognizer_RecognizeCompleted);  

        // Perform recognition on the entire file.  
        Console.WriteLine("Starting asynchronous recognition...");  
        completed = false;  
        recognizer.RecognizeAsync();  

        // Keep the console window open.  
        while (!completed)  
        {  
          Console.ReadLine();  
        }  
        Console.WriteLine("Done.");  
      }  

      Console.WriteLine();  
      Console.WriteLine("Press any key to exit...");  
      Console.ReadKey();  
    }  

    // Handle the SpeechRecognized event.  
    static void recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)  
    {  
      if (e.Result != null && e.Result.Text != null)  
      {  
        Console.WriteLine("  Recognized text =  {0}", e.Result.Text);  
      }  
      else  
      {  
        Console.WriteLine("  Recognized text not available.");  
      }  
    }  

    // Handle the RecognizeCompleted event.  
    static void recognizer_RecognizeCompleted(object sender, RecognizeCompletedEventArgs e)  
    {  
      if (e.Error != null)  
      {  
        Console.WriteLine("  Error encountered, {0}: {1}",  
        e.Error.GetType().Name, e.Error.Message);  
      }  
      if (e.Cancelled)  
      {  
        Console.WriteLine("  Operation cancelled.");  
      }  
      if (e.InputStreamEnded)  
      {  
        Console.WriteLine("  End of stream encountered.");  
      }  
      completed = true;  
    }  
  }  
}  

Remarks

If the recognizer reaches the end of the input file during a recognition operation, the recognition operation finalizes with the available input. Any subsequent recognition operations can generate an exception, unless you update the input to the recognizer.

Applies to

See also

• SetInputToAudioStream(Stream, SpeechAudioFormatInfo)
• SetInputToDefaultAudioDevice()
• SetInputToNull()
• SetInputToWaveStream(Stream)
• RecognizeCompleted