搭建文字转语音(TTS)服务器

1.试用地址

点击链接进行体验

2.开发环境

ASP.NET

3.需求

（1）需要动态将文本转化为语音
（2）实现免费的转换过程
（3）转换成语音后可以直接下载
（4）将语音加载到U3D中试用

3.实现过程

（1）新建ASP.NET空工程

（2）创建TextToSpeechController类，用于生成Wav文件

（3）添加Speech类库

（4）TextToSpeechController类代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using SpeechLib;
using System.Speech;
using System.Speech.Synthesis;
using System.IO;
using System.Security.Cryptography;
using System.Text;namespace TextToSpeechServer
{public static class TextToSpeechController{public static string GetSavePath(string speechText){//根据录入内容生成唯一文件名string fileName = Md5(speechText).ToUpper();fileName += ".wav";//获取根目录路径string path = HttpRuntime.AppDomainAppPath.ToString();//文件夹名称string DirectoryName = "音频文件";//音频文件夹路径string DirectoryPath = path + DirectoryName;//判断音频文件夹是否存在if (Directory.Exists(DirectoryPath) == false){Directory.CreateDirectory(path);}//wav文件路径string FilePath = DirectoryPath + "\\" + fileName;//如果已经有该文件，则直接返回文件名if (File.Exists(FilePath)){return fileName;}//否则生成音频文件else{SpeechSynthesizer synth = new SpeechSynthesizer();synth.Volume = 100;//设置文件保存位置synth.SetOutputToWaveFile(FilePath);//电脑中需要安装Huihui的语音包synth.SelectVoice("Microsoft Huihui Desktop");//能读中英文synth.Speak(speechText);synth.SetOutputToNull();}return fileName;}/// <summary>/// MD5加密，主要根据输入的文字来生成唯一的音频文件名/// </summary>/// <param name="value"></param>/// <returns></returns>public static string Md5(string value){var result = string.Empty;if (string.IsNullOrEmpty(value)) return result;using (var md5 = MD5.Create()){result = GetMd5Hash(md5, value);}return result;}/// <summary>/// MD5生成/// </summary>/// <param name="md5Hash"></param>/// <param name="input"></param>/// <returns></returns>static string GetMd5Hash(MD5 md5Hash, string input){byte[] data = md5Hash.ComputeHash(Encoding.UTF8.GetBytes(input));var sBuilder = new StringBuilder();foreach (byte t in data){sBuilder.Append(t.ToString("x2"));}return sBuilder.ToString();}}
}

（5）创建一般处理程序GetAudioStreamHandler.ashx
代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Web;namespace TextToSpeechServer
{/// <summary>/// GetAudioStreamHandler 的摘要说明/// </summary>public class GetAudioStreamHandler : HttpTaskAsyncHandler{/// <summary>/// 获取音频文件所在路径/// </summary>public string ServerRequestAddress = "http://" + HttpContext.Current.Request.Url.Authority + "/音频文件/{0}";/// <summary>/// 异步生成音频文件/// </summary>/// <param name="context"></param>/// <returns></returns>public override async Task ProcessRequestAsync(HttpContext context){await Task.Run(() =>{string speechText = context.Request.Params["SpeechText"].ToString().Trim();//将|!|!|转换为换行符speechText = speechText.Replace("|!|!|", "\n");string fileName = TextToSpeechController.GetSavePath(speechText);string requestURL = string.Format(ServerRequestAddress, fileName);//直接打开生成的音频文件context.Response.Redirect(requestURL);});}}
}

（6）创建前端aspx界面

前端页面代码如下：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="TextToSpeechPage.aspx.cs" Inherits="TextToSpeechServer.TextToSpeechPage" %><!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><title>文字转语音</title>
</head>
<body background="文字转语音.png" style="background-size:100%,100%;background-repeat:no-repeat;background-attachment:fixed"><form id="form1" runat="server"><table style="width:100%"><tr style="height:100px"><th><label style="font-size:50px;color:white;">文字语音转换器</label></th></tr><tr style="height:600px"><th><%--<textarea style="width:800px;height:500px;margin:100px,100px,100px,100px;font-size:20px"></textarea>--%><asp:TextBox ID="ConvertTextBox" runat="server" Height="500px" Width="800px" Font-Size="20px" TextMode="MultiLine"></asp:TextBox></th></tr><tr style="height:100px"><th><%--<button style="font-size:20px;width:150px;height:50px">开始转换</button>--%><asp:Button ID="ConvertButton" runat="server" OnClick="ConvertButton_Click" Text="开始转换" style="font-size:20px;width:150px;height:50px"/></th></tr></table></form>
</body>
</html>

后端处理程序代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;namespace TextToSpeechServer
{public partial class TextToSpeechPage : System.Web.UI.Page{protected void Page_Load(object sender, EventArgs e){}/// <summary>/// 获取当前部署的服务器IP地址，生成HTTP请求链接/// </summary>public string RequestURL = "http://" + HttpContext.Current.Request.Url.Authority + "//GetAudioStreamHandler.ashx?SpeechText={0}";/// <summary>/// 生成按钮点击事件/// </summary>/// <param name="sender"></param>/// <param name="e"></param>protected void ConvertButton_Click(object sender, EventArgs e){if (string.IsNullOrEmpty(ConvertTextBox.Text)){ConvertTextBox.Text = "请输入信息";}else{//替换换行符，纺织报错string CheckedURL = string.Format(RequestURL, ConvertTextBox.Text).Replace("\n", "|!|!|");Response.Redirect(CheckedURL);}}}
}

（7）测试、发布、部署到IIS

均为常规操作流程，这里不再详细介绍。

（8）注意事项

1）部署到IIS所在的服务器时，需要确保服务器上已经安装了Speech所需的环境

·安装 Microsoft Speech Platform - Server Runtime
·安装Microsoft Speech Platform - Software Development Kit (SDK)
·安装Microsoft Speech Platform - Server Runtime Languages【语言包，其中包含文本转语音功能包(TTS)和语音识别功能包(SR)，这里我们主要用TTS包】

2）部署后无法访问

·使用云产品的需要在控制台配置安全组规则，允许相关端口被其他电脑访问

·在部署的IIS所在文件夹进行权限设置，可参考这里。除了IIS_IUSRS和IUSRS外，还可以设置Everyone用户。

·可能上述设置了还会报错，如下图

这个与IIS中的应用程序池内权限有关

在高级设置中，将“标识”从默认的ApplicationPoolIdentity改为LocalSystem即可。

欲知详情，可点击这里。
【该部分设置private key部分，打开方式是Win+R运行，输入MMC，打开Microsoft管理控制台，但是该方法笔者没试成功~~】

（9）源码

Github链接

（10）参考文章

·IIS ApplicationPoolIdentity
·利用C#开发web应用程序时，对注册表进行操作提示没有权限的解决办法
·Microsoft Speech Platform 自学笔记2 环境要求与安装过程

（11）补充U3D中下载并播放语音

创建PlayAudioController脚本

using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEngine;
using UnityEngine.Networking;
using UnityEngine.UI;
using System.Security.Cryptography;
using System.Text;public class PlayAudioController : MonoBehaviour
{/// <summary>/// 转换文字输入框/// </summary>public InputField TextToAudioInputField;/// <summary>/// 音频/// </summary>public AudioSource audioSource;/// <summary>/// 请求地址/// </summary>private string RequestURL = "http://39.104.127.80:8082/GetAudioStreamHandler.ashx?SpeechText={0}";/// <summary>/// 文件名/// </summary>string FileName = "";/// <summary>/// 是否在StreamingAssets/AudioFile中存在/// </summary>bool alreadyExit = false;/// <summary>/// 将Text转化为Speech/// </summary>public void ConvertTextToSpeech(){if (string.IsNullOrEmpty(TextToAudioInputField.text)){return;}FileName = Md5(TextToAudioInputField.text).ToUpper() + ".wav";string FilePath = Application.streamingAssetsPath + "/AudioFile/" + FileName;alreadyExit = false;StartCoroutine(GetWavFileAndPlay(FilePath));}/// <summary>/// 从StreamingAssets/AudioFile文件中加载音频文件并播放/// </summary>/// <param name="FilePath"></param>/// <returns></returns>IEnumerator GetWavFileAndPlay(string FilePath){UnityWebRequest uwr = UnityWebRequestMultimedia.GetAudioClip(FilePath, AudioType.WAV);yield return uwr.SendWebRequest();if (uwr.isDone){if (uwr.isNetworkError || uwr.isHttpError){alreadyExit = false;Debug.Log(uwr.error);}else{AudioClip audioClip = DownloadHandlerAudioClip.GetContent(uwr);audioSource.clip = audioClip;audioSource.Play();alreadyExit = true;}}//判断当前音频文件是否存在if (!alreadyExit){string text = TextToAudioInputField.text.Replace("\n", "|!|!|");StartCoroutine(SaveWavFile(text));}}/// <summary>/// 当StreamingAssets/AudioFile文件夹下不存在指定Wav文件时，下载该音频文件并播放/// </summary>/// <param name="text"></param>/// <returns></returns>IEnumerator SaveWavFile(string text){UnityWebRequest uwr = UnityWebRequestMultimedia.GetAudioClip(string.Format(RequestURL, text),AudioType.WAV);yield return uwr.SendWebRequest();if (uwr.isNetworkError || uwr.isHttpError){Debug.Log(uwr.error);}else{//播放下载的Wav音频AudioClip audioClip = DownloadHandlerAudioClip.GetContent(uwr);audioSource.clip = audioClip;audioSource.Play();//保存下载的Wav音频文件byte[] data = uwr.downloadHandler.data;//这里的FileMode.create是创建这个文件,如果文件名存在则覆盖重新创建FileStream fs = new FileStream(Application.streamingAssetsPath + "/AudioFile/" + FileName, FileMode.Create);fs.Write(data, 0, data.Length);//每次读取文件后都要记得关闭文件fs.Close();}}/// <summary>/// MD5加密，主要根据输入的文字来生成唯一的音频文件名/// </summary>/// <param name="value"></param>/// <returns></returns>public static string Md5(string value){var result = string.Empty;if (string.IsNullOrEmpty(value)) return result;using (var md5 = MD5.Create()){result = GetMd5Hash(md5, value);}return result;}/// <summary>/// MD5生成/// </summary>/// <param name="md5Hash"></param>/// <param name="input"></param>/// <returns></returns>static string GetMd5Hash(MD5 md5Hash, string input){byte[] data = md5Hash.ComputeHash(Encoding.UTF8.GetBytes(input));var sBuilder = new StringBuilder();foreach (byte t in data){sBuilder.Append(t.ToString("x2"));}return sBuilder.ToString();}
}

源码