试图在C#中使用Google Speech2Text

以下简单代码尝试将wave文件发布到Google Speech2Text服务,但总是失败并显示“Gateway Timeout(504)”或一般异常“Operation timed out”.有人可以帮忙吗？

public void ProcessWaveFile(string path)
    {
        HttpWebRequest request = 
             (HttpWebRequest)HttpWebRequest.Create(
                 "https://www.google.com/"+ 
                 "speech-api/v1/recognize?"+ 
                 "xjerr=1&client=speech2text&lang=en-US&maxresults=10");

        ServicePointManager.ServerCertificateValidationCallback += 
                     delegate { return true; };

        request.Timeout = 60000;
        request.Method = "POST";
        request.KeepAlive = true;           
        request.ContentType = "audio/wav";
        request.UserAgent = "speech2text";

        FileInfo fInfo = new FileInfo(path);
        long numBytes = fInfo.Length;
        byte[] data;

        using (FileStream fStream = new FileStream(
                                          path,FileMode.Open,FileAccess.Read))
        {
            data = new byte[fStream.Length];
            fStream.Read(data,(int)fStream.Length);
            fStream.Close();
        }

        using (Stream wrStream = request.GetRequestStream())
            wrStream.Write(data,data.Length);

        try
        {
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            var resp = response.GetResponseStream();

            if (resp != null)
            {
                StreamReader sr = new StreamReader(resp);
                MessageBox.Show(sr.ReadToEnd());

                resp.Close();
                resp.dispose();
            }
        }
        catch (System.Exception ee)
        {
            MessageBox.Show(ee.Message);
        }           
    }

非常感谢.

舒贾特

解决方法

您的代码适用于我,但有以下更改：

Request.ContentType = "audio/x-flac; rate=8000";

并且您提供的文件需要采用FLAC格式.

我用Windows Sound Recorder录制了一个小样本,它生成了一个WMA文件.然后我使用VLC Player将WMA文件转换为FLAC(使用转换选项,确保以RAW格式输出,一个通道和8000 kbps)

一个好的non c# reference以及评论中的一些扩展api文档