有关音频的实现

最近在做新加坡政府项目时用到了声音。在此记录一下整个实现过程。
第一阶段实现:
System.Media.SoundPlayer sp = new System.Media.SoundPlayer("./FireCoding.wav");
sp.Load();
sp.PlaySync()

第二阶段的实现:
后来声音要求发送到不同的音频设备上去
于是使用了WinMM5.1
class WaveLib
    {

         #region properties   

        //int m_currentDeviceId = 0;
        private int CurrentDeviceId
        {
            get
            {
                int id = 1;
                try
                {
                    id = int.Parse(ConfigurationSettings.AppSettings["SoundDevice"]);
                }
                catch(Exception ex)
                {
                    Logger.GetLogger(Logger.LOCAL_LOG).Error("Sound Device number invaild in config file", ex);
                }
                return id - 1;
            }
            //set { m_currentDeviceId = value; }
        }

        private WaveFormat m_coutWaveFormat = WaveFormat.Pcm44Khz16BitStereo;
        public WaveFormat CoutWaveFormat
        {
            get { return m_coutWaveFormat; }
            set { m_coutWaveFormat = value; }
        }

        private string m_wavFileName = @"./FireCoding.wav";
        public string AudioFileName
        {
            get { return m_wavFileName; }
            set { m_wavFileName = value; }
        }

        //private string m_requiredProperty = "ProductName";
        //public string RequiredProperty
        //{
        //    get { return m_requiredProperty; }
        //    set { m_requiredProperty = value; }
        //}

        //private string m_device = "Win32_SoundDevice";
        //public string Device
        //{
        //    get { return m_device; }
        //    set { m_device = value; }
        //}
        #endregion

        #region get the sound device count
        //method1
        private const string mmdll = "winmm.dll";
        [DllImport(mmdll)]
        public static extern int waveOutGetNumDevs();

        public static int DeviceCount
        {
            get { return waveOutGetNumDevs(); }
        }

       //method2
        //List<ManagementObject> m_managementObjects = new List<ManagementObject>();

        //public void waveOutGetDevices()
        //{
        //    SelectQuery query = new SelectQuery(Device);
        //    ManagementObjectSearcher objSearcher = new ManagementObjectSearcher(query);
        //    ManagementObjectCollection objCollection = objSearcher.Get();
        //    foreach (ManagementObject obj in objCollection)
        //    {
        //        foreach (PropertyData property in obj.Properties)
        //        {
        //            if (property.Name == RequiredProperty)
        //            {
        //                m_managementObjects.Add(obj);
        //            }
        //        }
        //    }

        //    //return m_managementObjects;
        //}
        #endregion

        public WaveLib()
        {
            //init devices list
            //waveOutGetDevices();
        }

        #region play the sound
        public bool Play()
        {
            try
            {
                int deviceId = 0;
                //if there is at least one sound device.
                //if (m_managementObjects.Count > 1)
                if(DeviceCount>1)
                {
                    deviceId = CurrentDeviceId;
                }
                WaveOut waveOut = new WaveOut(deviceId);

                byte[] data = ReadAudioFile();
                waveOut.Open(CoutWaveFormat);
                waveOut.Write(data);

            }
            catch (Exception ex)
            {
                return false;
            }

            return true;
        }
        #endregion

        #region read the sound file to buffer
        private byte[] ReadAudioFile()
        {
            byte[] buffer;
            FileStream fileStream = new FileStream(AudioFileName, FileMode.Open, FileAccess.Read);
            try
            {
                int length = (int)fileStream.Length;  // get file length
                buffer = new byte[length];            // create buffer
                int count;                            // actual number of bytes read
                int sum = 0;                          // total number of bytes read

                // read until Read method returns 0 (end of the stream has been reached)
                while ((count = fileStream.Read(buffer, sum, length - sum)) > 0)
                {

                    sum += count;  // sum is a buffer offset for next reading
                }

            }
            finally
            {
                fileStream.Close();
            }
            return buffer;
        }
        #endregion

    }

调用方法：
if (File.Exists(tape.WavFile))
            {
               
                //SoundPlayer sp = new SoundPlayer(tape.WavFile);
                //sp.Load();
                //sp.PlaySync();

                //@yohen 08/12/2010
                var waveLib = new WaveLib();
                waveLib.AudioFileName = tape.WavFile;
                waveLib.CoutWaveFormat = tape.Name == "DefaultVoice" ? WaveFormat.Pcm11Khz8BitMono : WaveFormat.Pcm44Khz16BitStereo;
                waveLib.Play();
               
            }

第三阶段的实现：
用户的要求现在不只停留在生简的声音上面了，而且要求根据不同的报警声音，朗读不同的事件文本。
于是我改用了SpeechLib.
郎读文本的代码
public TTSConverter()
        {
            this.voice = new SpVoice();
        }

        public bool Play(string text)
        {
            if (string.IsNullOrEmpty(text))
                return false;

            //set the speech device if there are more than one device.
            //@yohen 08/12/2010
            var spObjectTokens = voice.GetAudioOutputs(string.Empty, string.Empty);
            if(spObjectTokens.Count>1)
            {
                voice.AudioOutput = spObjectTokens.Item(CurrentSoundDeviceId);
            }

            //speak speed @yohen 14/12/2010
            voice.Rate = -1;
            //voice.Speak("<pron sym=\"h eh 1 l ow & we\">hello</pron>", spFlags);
            //voice.Speak("<PRON SYM=\"d eh l f y\">Delphi</PRON>", spFlags);
            this.voice.Speak(text, this.flags);
            return true;
        }
播放声音的代码
SpVoiceClass pp = new SpVoiceClass();

            var spObjectTokens = pp.GetAudioOutputs(string.Empty, string.Empty);
            if (spObjectTokens.Count > 1)
            {
                pp.AudioOutput = spObjectTokens.Item(CurrentSoundDeviceId);
            }

            SpFileStreamClass spFs = new SpFileStreamClass();
            spFs.Open(AudioFileName, SpeechStreamFileMode.SSFMOpenForRead, true);
            ISpeechBaseStream Istream = spFs as ISpeechBaseStream;
            pp.SpeakStream(Istream, SpeechVoiceSpeakFlags.SVSFIsFilename);
          
            spFs.Close();

最终使用SpeechLib,播放声音和朗读文本，并实现用户可选择音频设备。