/// <summary>
        /// 将amr音频转成mp3手机音频
        /// </summary>
        /// <param name="applicationPath">ffmeg.exe文件路径</param>
        /// <param name="fileName">amr文件的路径(带文件名)</param>
        /// <param name="targetFilName">生成目前mp3文件路径（带文件名）</param>
        public static void ConvertToAmr(string applicationPath, string fileName, string targetFilName)
        {
            //ffmpeg -i 1.mp3 -ac 1 -ar 8000 1.amr 
            //ffmpeg -i 1.mp3 -ac 1 -ar 8000 1.amr            
            string c = applicationPath + @"\ffmpeg -i " + fileName + " " + targetFilName;
            c = c.Replace("//", "\\").Replace("/", "\\");
            //string c = applicationPath + @"\ffmpeg.exe -y -i " + fileName + " -ar 8000 -ab 12.2k -ac 1 " + targetFilName;
            Cmd(c);
        }

        /// <summary>
        /// 执行Cmd命令
        /// </summary>
        private static void Cmd(string c)
        {
            try
            {
                System.Diagnostics.Process process = new System.Diagnostics.Process();
                process.StartInfo.FileName = "cmd.exe";
                process.StartInfo.UseShellExecute = false;
                process.StartInfo.CreateNoWindow = true;
                process.StartInfo.RedirectStandardOutput = true;
                process.StartInfo.RedirectStandardInput = true;
                process.Start();

                process.StandardInput.WriteLine(c);
                process.StandardInput.AutoFlush = true;
                process.StandardInput.WriteLine("exit");

                StreamReader reader = process.StandardOutput;//截取输出流           

                process.WaitForExit();
            }
            catch
            { }
        }

#region 二进制转音频文件

        /// <summary>
        /// 二进制转音频文件
        /// </summary>
        /// <param name="audioBytes">base64位的音频文件</param>
        /// <param name="compno">文件路径的一部分（客户编号）</param>
        /// <param name="filename">文件名称</param>
        /// <returns></returns>
        public static string CByteToAudio(string base64str, string compno, string filename)
        {
            if (base64str.Length != 0)
            {
                byte[] audioBytes = Convert.FromBase64String(base64str);                
                string address = ConfigurationManager.AppSettings["CustomAudioSavePath"];
                string filenaMp3 = address + compno + "/";
                string filenaAmr = address + compno + "/" + filename;  //完成的文件路径+文件名                
                if (!Directory.Exists(address + compno))
                {
                    Directory.CreateDirectory(address + compno);
                }
                
                using (System.IO.MemoryStream ms = new MemoryStream(audioBytes))
                {
                    //有时候为了避免流指针定位错误，显式定义一下指针位置到也可以
                    ms.Seek(0, SeekOrigin.Begin);
                    using (Stream fs = new FileStream(filenaAmr, FileMode.Create))
                    {
                        ms.WriteTo(fs);  //将fs写入到ms中
                        //将amr文件转换为mp3格式的文件
                        FileInfo fileInfo = new FileInfo(filenaAmr);
                        filenaMp3 += fileInfo.Name.Split(\'.\')[0] + ".mp3";
                        //Common.API.LogAPI.debug("路径路径路径：" + System.AppDomain.CurrentDomain.BaseDirectory + "bin");                        
                        ConvertToAmr(System.AppDomain.CurrentDomain.BaseDirectory+"bin", filenaAmr, filenaMp3);                        
                    }                   
                }
                return filenaMp3;
            }
            else
            {
                return "";
            }
        }

        #endregion

public void FileToBase64()
{
　　#region 测试
    System.IO.FileStream fs = System.IO.File.OpenRead("D:\\dfdfdfdf.amr");//传文件的路径即可
    System.IO.BinaryReader br = new BinaryReader(fs);
    byte[] _filestr = br.ReadBytes(Convert.ToInt32(fs.Length));
    base64str = Convert.ToBase64String(_filestr);
    br.Close();
    fs.Close();
　　#endregion
}