using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Threading;

using SpeechLib;//NET2.0 引用 Speech sdk 5.1 在COM选项卡里面的Microsoft Speech  object  library引用 已经有11.0版本

using System.Speech;

using System.Speech.Recognition;

using System.Speech.Synthesis;

namespace Speech

{

    /// <summary>

    /// 20140427

    /// 涂聚文

    ///

    /// </summary>

    public partial class Form1 : Form

    {

        private enum State

        {

            Idle = 0,

            Accepting = 1,

            Off = 2,

        }

        private State RecogState = State.Off;

        private SpeechRecognitionEngine recognizer;

        private SpeechSynthesizer synthesizer = null;

        private int Hypothesized = 0;

        private int Recognized = 0;

        /// <summary>

        ///

        /// </summary>

        public Form1()

        {

            InitializeComponent();

        }

        /// <summary>

        ///

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void Form1_Load(object sender, EventArgs e)

        {

            // SpVoice voice = new SpVoice();//SAPI 5.4

            //SpeechLib.ISpeechObjectTokens obj = voice.GetVoices(string.Empty, string.Empty);

            //int count = obj.Count;//获取语音库总数

            //bool result = false;

            //for (int i = 0; i < count; i++)

            //{

            //    string desc = obj.Item(i).GetDescription(i);//.GetDescription(); //遍历语音库

            //    comboBox1.Items.Add(desc);

            //}

            //SpVoiceClass voice = new SpVoiceClass();//SAPI 5.1

            ////voice.Voice = voice.GetVoices(string.Empty, string.Empty).Item(0);

            ////voice.Speak("你要说的话",SpeechVoiceSpeakFlags.SVSFlagsAsync);

            //SpVoice voice1 = new SpVoice();//SAPI 5.4

            //voice1.Volume = 100;//音量

            //voice1.Voice = voice1.GetVoices(string.Empty, string.Empty).Item(0);

            //voice1.Rate = 2;//速度语音朗读速度

            //           voice1.Speak("你要说的话", SpeechVoiceSpeakFlags.SVSFlagsAsync);

             //voice1.Speak("speech sdk 5.1", SpeechVoiceSpeakFlags.SVSFlagsAsync);

            //SpeechSynthesizer syn = new SpeechSynthesizer();

            //syn.SelectVoice("Microsoft Lili"); 

            //initialize recognizer and synthesizer

            InitializeRecognizerSynthesizer();

            //if input device found then proceed

            if (SelectInputDevice())

            {

                LoadDictationGrammar();

                ReadAloud("中华人民共和国"); //中文方式Speech Engine Ready for Input

            }

        }

        /// <summary>

        /// 中文

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void button1_Click(object sender, EventArgs e)

        {

            SpVoiceClass voice = new SpVoiceClass();

            voice.Voice = voice.GetVoices(string.Empty, string.Empty).Item(0); //0，为系统默认,中文

            voice.Speak(this.textBox1.Text.Trim(), SpeechVoiceSpeakFlags.SVSFlagsAsync);

        }

        /// <summary>

        /// 英文

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void button2_Click(object sender, EventArgs e)

        {

            SpVoiceClass voice = new SpVoiceClass();

            voice.Voice = voice.GetVoices(string.Empty, string.Empty).Item(1);//

            voice.Speak(this.textBox2.Text.Trim(), SpeechVoiceSpeakFlags.SVSFlagsAsync);

        }

        /// <summary>

        /// 输入中文语音输出中文文字

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void button3_Click(object sender, EventArgs e)

        {

            switch (RecogState)

            {

                case State.Off:

                    RecogState = State.Accepting;

                    button3.Text = "Stop";

                    recognizer.RecognizeAsync(RecognizeMode.Multiple);

                    break;

                case State.Accepting:

                    RecogState = State.Off;

                    button3.Text = "Start";

                    recognizer.RecognizeAsyncStop();

                    break;

            }

        }

        /// <summary>

        /// pause recognition and speak the text sent

        /// </summary>

        /// <param name="speakText"></param>

        public void ReadAloud(string speakText)

        {

            try

            {

                recognizer.RecognizeAsyncCancel();

                synthesizer.SpeakAsync(speakText);

            }

            catch { }

        }

        /// <summary>

        /// initialize recognizer and synthesizer along with their events

        /// /// </summary>

        private void InitializeRecognizerSynthesizer()

        {

            var selectedRecognizer = (from e in SpeechRecognitionEngine.InstalledRecognizers()

                                      where e.Culture.Equals(Thread.CurrentThread.CurrentCulture)

                                      select e).FirstOrDefault();

            recognizer = new SpeechRecognitionEngine(selectedRecognizer);

            recognizer.AudioStateChanged += new EventHandler<AudioStateChangedEventArgs>(recognizer_AudioStateChanged);

            recognizer.SpeechHypothesized += new EventHandler<SpeechHypothesizedEventArgs>(recognizer_SpeechHypothesized);

            recognizer.SpeechRecognized += new EventHandler<SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);

            synthesizer = new SpeechSynthesizer();

        }

        #region Recognizer events

        private void recognizer_AudioStateChanged(object sender, AudioStateChangedEventArgs e)

        {

            switch (e.AudioState)

            {

                case AudioState.Speech:

                    LabelStatus.Text = "Listening";

                    break;

                case AudioState.Silence:

                    LabelStatus.Text = "Idle";

                    break;

                case AudioState.Stopped:

                    LabelStatus.Text = "Stopped";

                    break;

            }

        }

        /// <summary>

        ///

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void recognizer_SpeechHypothesized(object sender, SpeechHypothesizedEventArgs e)

        {

            Hypothesized++;

            LabelHypothesized.Text = "Hypothesized: " + Hypothesized.ToString();

        }

        /// <summary>

        ///

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)

        {

            Recognized++;

            string s = "Recognized: " + Recognized.ToString();

            if (RecogState == State.Off)

                return;

            float accuracy = (float)e.Result.Confidence;

            string phrase = e.Result.Text;

            {

                if (phrase == "End Dictate")

                {

                    RecogState = State.Off;

                    recognizer.RecognizeAsyncStop();

                    ReadAloud("Dictation Ended");

                    return;

                }

                textBox1.AppendText(" " + e.Result.Text);

            }

        }

        #endregion

        /// <summary>

        /// select input device if available

        /// </summary>

        /// <returns></returns>

        private bool SelectInputDevice()

        {

            bool proceedLoading = true;

            //if OS is above XP

            if (IsOscompatible())

            {

                try

                {

                    recognizer.SetInputToDefaultAudioDevice();

                }

                catch

                {

                    proceedLoading = false; //no audio input device

                }

            }

            //if OS is XP or below

            else

                ThreadPool.QueueUserWorkItem(InitSpeechRecogniser);

            return proceedLoading;

        }

        /// <summary>

        /// Findout if OS is compatible.

        /// </summary>

        /// <returns>true if greater than XP otherwise false</returns>

        private bool IsOscompatible()

        {

            OperatingSystem osInfo = Environment.OSVersion;

            if (osInfo.Version > new Version("6.0"))

                return true;

            else

                return false;

        }

        /// <summary>

        ///

        /// </summary>

        /// <param name="o"></param>

        private void InitSpeechRecogniser(object o)

        {

            recognizer.SetInputToDefaultAudioDevice();

        }

        /// <summary>

        /// Load grammars, one for command and other for dictation

        /// </summary>

        private void LoadDictationGrammar()

        {

            GrammarBuilder grammarBuilder = new GrammarBuilder();

            grammarBuilder.Append(new Choices("End Dictate"));

            Grammar commandGrammar = new Grammar(grammarBuilder);

            commandGrammar.Name = "main command grammar";

            recognizer.LoadGrammar(commandGrammar);

            DictationGrammar dictationGrammar = new DictationGrammar();

            dictationGrammar.Name = "dictation";

            recognizer.LoadGrammar(dictationGrammar);

        }

    }

}