常见的 音频文件就不用多说了，今天就说一下比较冷门的音频文件。

DSS、DS2文件转换的代码：

  AudioFunctions ds2 = new AudioFunctions();
  ds2.DSSToWav(income_fn, wav_fn); 

需要的环境：

DPMControl.msi

OlyAudCom.dll

PIA.DpmCtrlLib.dll

代码：

下面是AudioFileSourceType2.OLYMPUS、 AudioFileSourceType2.PHILIPS的处理

 public void DSSToWav(string dssFile, string outputFile, bool processUnknown = true)
        {
            if (File.Exists(outputFile))
            {
                File.Delete(outputFile);
            }

            OlympusConverter converter = new OlympusConverter();
            AudioFileDetails2 fileDetails = converter.GetAudioFileDetails(dssFile);
            if (fileDetails == null)
            {
                throw new Exception("Unable to determine file source type.");
            }
            else if (fileDetails.AudioFileSourceType == AudioFileSourceType2.OLYMPUS)
            {
                Console.WriteLine("\tConverting with Olympus Converter");
                converter.Convert(dssFile, outputFile);
                converter = null;
                fileDetails = null;
                GC.Collect(2, GCCollectionMode.Forced);
            }
            else if (fileDetails.AudioFileSourceType == AudioFileSourceType2.PHILIPS)
            {
                Console.WriteLine("\tConverting with Philips DPMCtrl Converter");

                PhilipsConverter DPMCtrl = new PhilipsConverter();
                DPMCtrl.convert(dssFile, outputFile, 0, false);
                DPMCtrl = null;
                converter = null;
                fileDetails = null;
                GC.Collect(2, GCCollectionMode.Forced);
            }
            else if (fileDetails.AudioFileSourceType == AudioFileSourceType2.UNKNOWN && processUnknown == true)
            {
                Console.WriteLine("\tTrying DSS as DS2");
                string ds2File = dssFile + ".ds2";
                WavFileUtils.ChangeDSS2DS2(dssFile, ds2File);
                DSSToWav(ds2File, outputFile, false);
                File.Delete(ds2File);
            }
        }

 public static void ChangeDSS2DS2(string inPath, string outPath)
        {
            using (BinaryReader br = new BinaryReader(new FileStream(inPath, FileMode.Open)))
            {
                using (BinaryWriter wr = new BinaryWriter(new FileStream(outPath, FileMode.Create)))
                {
                    int index = 0;
                    int count = 1024;
                    byte[] buffer = new byte[count];
                    int bufferSize = 0;
                    while ((bufferSize = br.Read(buffer, 0, count)) > 0)
                    {
                        if (index == 0)
                        {
                            for (int i = 0; i < 10; i++)
                            {
                                if (buffer[i] == 'd' && buffer[i + 1] == 's' && buffer[i + 2] == 's')
                                {
                                    buffer[i] = (byte)'d';
                                    buffer[i + 1] = (byte)'s';
                                    buffer[i + 2] = (byte)'2';
                                    break;
                                }
                            }
                        }

                        wr.Write(buffer, 0, bufferSize);

                        index += bufferSize;
                    }
                }
            }
        }

对于  AudioFileSourceType2.PHILIPS使用下面的代码进行处理：

   public class PhilipsConverter
    {
        public void convert(string sourceFile, string destFile, int AudioFormat, bool delayed)
        {
            try
            {
                IDPMControl iDPM = new DPMControl();
                iDPM.Initialize(false);
                //After initializing the DPMControl it is possible to extract job information from a file. 
                //var fileInfo = iDPM.get_FileInfo(sourceFile);

                //The last arguement is the files password, as we do not support password protected DS2 it is always blank string. 
                //If we get a password protected file then the task will fail. 
                iDPM.Decrypt(sourceFile, destFile, (dpmAudioFormat)AudioFormat, delayed, "");
                iDPM.Deinitialize();
            }
            catch (COMException e)
            {
                //From my testing, when passing a file with a password the Error message is DPMCtrlFileNotFound. 
                var err = e.ErrorCode;
                dpmCtrlError dpmErr = (dpmCtrlError)err;
                Console.WriteLine(string.Format("****\nErrCode: {0}\nError: {1}\n****", err, dpmErr));
                throw new Exception("Failed to convert DS2 to Wav with error message " + dpmErr, innerException: e);
            }
        }

    }