百度语音识别(采集麦克风声音 并自动转为文字)

【实例截图】

【核心代码】

using System;
using System.Windows.Forms;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Net;
using System.Text;
using System.Runtime.InteropServices;
using System.Drawing;
using BATT.AudioModule;

namespace BATT
{
    public partial class Form1 : Form
    {
        private BackgroundWorker backgroundWorker = new BackgroundWorker();
        private string resultStr;

        private bool isRecord = false;
        private string accessToken = null;

        private SpeechModel speechModel = new SpeechModel();
        private AutomaticSpeechRecognition testASR;

        private string tempStr = ""; // 存储转换后的音频文件的临时目录

        private ISpeechRecorder recorder = new NAudioRecorder();
        private bool switchRecord = true;

        private string str = null;

        public Form1()
        {
            InitializeComponent();

            testASR = new AutomaticSpeechRecognition(speechModel);

            // 绑定拖放事件
            richTextBoxResult.AllowDrop = true;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            // 向comboBox添加数据
            List<KeyValuePair<string, string>> listItems = new List<KeyValuePair<string, string>>();
            listItems.Add(new KeyValuePair<string, string>("中文", "zh"));
            listItems.Add(new KeyValuePair<string, string>("英语", "en"));
            listItems.Add(new KeyValuePair<string, string>("粤语", "ct"));
            comboBoxLan.DataSource = listItems;
            comboBoxLan.DisplayMember = "Key";
            comboBoxLan.ValueMember = "Value";
            comboBoxLan.SelectedIndex = 0;

            // 绑定事件以实现异步化
            backgroundWorker.DoWork  = new DoWorkEventHandler(backgroundWorker_DoWork);
            backgroundWorker.RunWorkerCompleted  = new RunWorkerCompletedEventHandler(backgroundWorker_RunWorkerCompleted);

            // 从文件中获取令牌，避免远程服务器上的请求过多
            if (!File.Exists(@".\token.dat"))
            {
                accessToken = testASR.GetStrAccess(); // 令牌文件不存在，发送请求
            }
            else
            {
                string[] tokenInfo = File.ReadAllLines(@".\token.dat");

                // 检查令牌是否过期
                if (Convert.ToInt32(tokenInfo[1]) > ClassUtils.CurrentTime2Second())
                {
                    accessToken = tokenInfo[0];
                }
                else
                {
                    accessToken = testASR.GetStrAccess(); // 过期，再次请求刷新
                }
            }

            speechModel.APIAccessToken = accessToken; // 更新 模式中的令牌

            #region 鼠标悬停时显示提示
            ToolTip toolTip = new ToolTip();

            toolTip.SetToolTip(buttonRecord, "录音/停止录音");

            toolTip.SetToolTip(comboBoxLan, "选择识别语言");

            toolTip.SetToolTip(richTextBoxResult, "识别语音的内容");
            #endregion

        }

        /// <summary>
        /// 开始录音/停止录音
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void buttonRecord_Click(object sender, EventArgs e)
        {
            if (switchRecord)
            {
                switchRecord = false; // 切换录音状态
                buttonRecord.BackgroundImage = (Bitmap)Properties.Resources.ResourceManager.GetObject("采集结束");

                if (recorder == null)
                {
                    recorder = new NAudioRecorder();
                }
                recorder.SetFileName("record.wav");
                recorder.StartRec();
                labelInfo.ForeColor = Color.SpringGreen;
                labelInfo.Text = "记录：正在采集.";
            }
            else
            {
                switchRecord = true;
                buttonRecord.BackgroundImage = (Bitmap)Properties.Resources.ResourceManager.GetObject("正在采集");

                if (recorder == null)
                {
                    return;
                }
                isRecord = true;
                recorder.StopRec();
                recorder = null;
                string filePath = Environment.CurrentDirectory   @"\record.wav";
                StartRecognize(filePath);
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            richTextBoxResult.Clear();
        }

        private void StartRecognize(string apiRecord)
        {
            WavInfo wav = ClassUtils.GetWavInfo(apiRecord);

            //数据量 = (采样频率 × 采样位数 × 声道数 × 时间) / 8
            //if ((double)(wav.datasize * 8) / (wav.dwsamplespersec * wav.wbitspersample * wav.wchannels) > 60)
            //{
            //    labelInfo.ForeColor = Color.HotPink;
            //    labelInfo.Text = "Error: The audio file is too large!";
            //}

            // 非8k/16k, 16bit 位深, 单声道的，进行格式转换
            if (apiRecord.EndsWith(".mp3", StringComparison.CurrentCultureIgnoreCase)
                || int.Parse(wav.dwsamplespersec.ToString()) != 16000
                || int.Parse(wav.wbitspersample.ToString()) != 16
                || int.Parse(wav.wchannels.ToString()) != 1)
            {
                apiRecord = ClassUtils.Convert2Wav(apiRecord); // 音频文件转换为16k，16bit wav
                tempStr = apiRecord;
            }

            labelInfo.ForeColor = Color.SpringGreen;
            labelInfo.Text = "正在采集...";
            KeyValuePair<string, string> keyVal = (KeyValuePair<string, string>)comboBoxLan.SelectedItem;
            speechModel.APILanguage = keyVal.Value; // 在组合框中获取值

            if (backgroundWorker.IsBusy != true)
            {
                this.backgroundWorker.RunWorkerAsync(); // 做耗时的任务
            }

        }

        #region 异步工作
        private void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
        {
            // 表示这是录制的音频
            if (isRecord)
            {
                speechModel.APIRecord = System.Environment.CurrentDirectory   @"\record.wav";
                isRecord = false;
            }

            // 表示转换工作已经完成
            if (tempStr != "")
            {
                speechModel.APIRecord = tempStr;
            }
            resultStr = testASR.GetStrText()   "\r\n";
        }

        private void backgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            this.richTextBoxResult.Text  = resultStr;
            labelInfo.ForeColor = Color.SpringGreen;
            labelInfo.Text = "识别完成!";

            // 完成识别，删除临时目录
            if (tempStr != "")
            {
                Directory.Delete(Path.GetDirectoryName(tempStr), true); // 递归删除目录或子目录
            }
        }
        #endregion

    }
}