【英语学习系统】使用百度API进行在线文字换语音，语音合成

使用语音与用户进行交互则最基础的部分应该具有语音合成的功能，目前百度AI平台提供的语音合成服务是很好的解决方案。

首先到百度AI官网申请创建语音合成应用，地址http://ai.baidu.com/tech/speech/tts

下载SDK  地址http://ai.baidu.com/sdk

按照官网给出的技术文档对百度语音API进行调用

Demo:

在unity3d中使用百度语音

首先将SDK中的动态链接库文件添加到unity项目引用中

在添加过程中由于在之前进行过通过百度api进行人脸识别，已导入过百度AI的SDK 再次导入版本不同会导致同名链接库文件出现冲突，直接使用3.3.1版本的动态链接库文件开发即可。

完整版封装可直接调用的类文件：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;
using System.ComponentModel;
using System.IO;
using System.Net;
using System.Text;

public class aduio : MonoBehaviour {

    private const string lan = "zh";
    private const string per = "1";
    private const string ctp = "1";
    private const string spd = "4";
    private const string pit = "6";
    private const string vol = "9";
    private const string cuid = "00-12-7B-16-74-8D";
    public  string tex = "";
    private const string tok = "24.0d92efd41bbb50b9c910654e7bbf600d.2592000.1523522687.282335-9900430";
    private const string rest = "tex={0}&lan={1}&per={2}&ctp={3}&cuid={4}&tok={5}&spd={6}&pit={7}&vol={8}";

    private const int NULL = 0, ERROR_SUCCESS = NULL;

    [System.Runtime.InteropServices.DllImport("WinMm.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto, CallingConvention = System.Runtime.InteropServices.CallingConvention.StdCall)]

    private static extern int mciSendString(string lpstrCommand, string lpstrReturnString, int uReturnLength, int hwndCallback);

    public aduio(string tex) {
        this.tex = tex;
    }

    public void creatMp3(string strFilename)
    {
        string strUpdateData = string.Format(rest, tex, lan, per, ctp, cuid, tok, spd, pit, vol);
        HttpWebRequest req = WebRequest.Create("http://tsn.baidu.com/text2audio") as HttpWebRequest;
        req.Method = "POST";
        req.ContentType = "application/x-www-form-urlencoded";
        req.ContentLength = Encoding.UTF8.GetByteCount(strUpdateData);
        using (StreamWriter sw = new StreamWriter(req.GetRequestStream()))
            sw.Write(strUpdateData);
        HttpWebResponse res = req.GetResponse() as HttpWebResponse;


        //直到request.GetResponse()程序才开始向目标网页发送Post请求
        Stream responseStream = res.GetResponseStream();
        //创建本地文件写入流
        Stream stream = new FileStream(Application.streamingAssetsPath + "//Ogg//"+ strFilename + ".mp3", FileMode.Create);
        byte[] bArr = new byte[1024];
        int size = responseStream.Read(bArr, 0, (int)bArr.Length);
        while (size > 0)
        {
            stream.Write(bArr, 0, size);
            size = responseStream.Read(bArr, 0, (int)bArr.Length);
        }
        stream.Close();
        responseStream.Close();
    }
}

调用：

aduio a = new aduio("欢迎进入英语学习系统，如果你准备好了请说开始");
        strFilname = Guid.NewGuid().ToString();
        a.creatMp3(strFilname);
        string strMp3 = "//Ogg//" + strFilname + ".mp3";
        string strWav = "//Ogg//" + strFilname + ".wav";
        StartCoroutine(LoadMusic(Application.streamingAssetsPath + strMp3, Application.streamingAssetsPath + strWav));