Unity 百度语音合成

前言

本篇文章演示在unity引擎中接入百度语音API的语音合成（适用于Windows平台，其它平台的后续更新）
因为在上一篇发布的文章中已经有一些准备步骤，这一篇就直接进入正题。
（1）搭建好一个UI面板

（2）编写脚本
①获取Access Token的方式和语音识别一样，这里我直接复制过来

/// 

    /// 获取accessToken请求令牌
    /// 
    /// 
    IEnumerator _GetAccessToken()
    {
        var uri =
            string.Format(
                "https://openapi.baidu.com/oauth/2.0/token?grant_type=client_credentials&client_id={0}&client_secret={1}",
                api_key, secret_Key);
        UnityWebRequest unityWebRequest = UnityWebRequest.Get(uri);
        yield return unityWebRequest.SendWebRequest();
        if (unityWebRequest.isDone)
        {
            Match match = Regex.Match(unityWebRequest.downloadHandler.text, @"access_token.:.(.*?).,");
            if (match.Success)
            {
                Debug.Log("Token已经匹配");
                accessToken = match.Groups[1].ToString();
            }
            else
            {
                Debug.Log("验证错误,获取AccessToken失败!!!");
            }
        }
    }

然后就编写代码直接调用接口进行语音合成

/// 

    /// 请求语音合成
    /// 
    /// 
    /// 
    /// 
    public IEnumerator StratTTS(string text, Action<TtsResponse> callback)
    {
        var url = "http://tsn.baidu.com/text2audio";

        var param = new Dictionary<string, string>();
        param.Add("tex", text);
        param.Add("tok", accessToken);
        param.Add("cuid", SystemInfo.deviceUniqueIdentifier);
        param.Add("ctp", "1");
        param.Add("lan", "zh");
        param.Add("spd", "5");
        param.Add("pit", "5");
        param.Add("vol", "10");
        param.Add("per", "1");
#if UNITY_STANDALONE || UNITY_EDITOR || UNITY_UWP
        param.Add("aue", "6"); //Windows设置为wav格式，移动端需要mp3格式
#endif
        int i = 0;
        foreach (var p in param)
        {
            url += i != 0 ? "&" : "?";
            url += p.Key + "=" + p.Value;
            i++;
        }
#if UNITY_STANDALONE || UNITY_EDITOR || UNITY_UWP  //根据不同平台，获取不同类型的音频格式
        var www = UnityWebRequestMultimedia.GetAudioClip(url, AudioType.WAV);
#else
        var www = UnityWebRequestMultimedia.GetAudioClip(url, AudioType.MPEG);
#endif
        Debug.Log("[WitBaiduAip]" + www.url);
        yield return www.SendWebRequest();

        if (www.isHttpError || www.isNetworkError)
            Debug.LogError(www.error);
        else
        {
            var type = www.GetResponseHeader("Content-Type");
            Debug.Log("[WitBaiduAip]response type: " + type);
            if (type.Contains("audio"))
            {
                var response = new TtsResponse { clip = DownloadHandlerAudioClip.GetContent(www) };
                callback(response);
            }
            else
            {
                var textBytes = www.downloadHandler.data;
                var errorText = Encoding.UTF8.GetString(textBytes);
            }
        }
    }

对返回的语音进行播放

StartCoroutine(StratTTS(ttsText.text, s =>
            {
                source.clip = s.clip;
                source.Play();
            }));

全篇的代码如下：

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;
using UnityEngine;
using UnityEngine.Networking;
using UnityEngine.UI;

public class TTS : MonoBehaviour
{
    //自行填写自己的百度语音识别相关key
    public string api_key;
    public string secret_Key;
    string accessToken = string.Empty;

    Button StartTTS;
    InputField ttsText;
    AudioSource source;

    void Start()
    {
        StartTTS = GameObject.Find("Canvas/Start").GetComponent<Button>();
        ttsText = GameObject.Find("Canvas/panel/tts").GetComponent<InputField>();
        source = transform.GetComponent<AudioSource>();
        StartCoroutine(_GetAccessToken());
        StartTTS.onClick.AddListener(()=> {
            StartCoroutine(StratTTS(ttsText.text, s =>
            {
                source.clip = s.clip;
                source.Play();
            }));
        });
    }

    /// 

    /// 返回的语音合成结果
    /// 
    public class TtsResponse
    {
        public int error_index;
        public string error_msg;
        public string sn;
        public int idx;
        public bool Success
        {
            get { return error_index == 0; }
        }
        public AudioClip clip;
    }
    

    /// 

    /// 请求语音合成
    /// 
    /// 
    /// 
    /// 
    public IEnumerator StratTTS(string text, Action<TtsResponse> callback)
    {
        var url = "http://tsn.baidu.com/text2audio";

        var param = new Dictionary<string, string>();
        param.Add("tex", text);
        param.Add("tok", accessToken);
        param.Add("cuid", SystemInfo.deviceUniqueIdentifier);
        param.Add("ctp", "1");
        param.Add("lan", "zh");
        param.Add("spd", "5");
        param.Add("pit", "5");
        param.Add("vol", "10");
        param.Add("per", "1");
#if UNITY_STANDALONE || UNITY_EDITOR || UNITY_UWP
        param.Add("aue", "6"); //Windows设置为wav格式，移动端需要mp3格式
#endif
        int i = 0;
        foreach (var p in param)
        {
            url += i != 0 ? "&" : "?";
            url += p.Key + "=" + p.Value;
            i++;
        }
#if UNITY_STANDALONE || UNITY_EDITOR || UNITY_UWP  //根据不同平台，获取不同类型的音频格式
        var www = UnityWebRequestMultimedia.GetAudioClip(url, AudioType.WAV);
#else
        var www = UnityWebRequestMultimedia.GetAudioClip(url, AudioType.MPEG);
#endif
        Debug.Log("[WitBaiduAip]" + www.url);
        yield return www.SendWebRequest();

        if (www.isHttpError || www.isNetworkError)
            Debug.LogError(www.error);
        else
        {
            var type = www.GetResponseHeader("Content-Type");
            Debug.Log("[WitBaiduAip]response type: " + type);
            if (type.Contains("audio"))
            {
                var response = new TtsResponse { clip = DownloadHandlerAudioClip.GetContent(www) };
                callback(response);
            }
            else
            {
                var textBytes = www.downloadHandler.data;
                var errorText = Encoding.UTF8.GetString(textBytes);
            }
        }
    }


    /// 

    /// 获取accessToken请求令牌
    /// 
    /// 
    IEnumerator _GetAccessToken()
    {
        var uri =
            string.Format(
                "https://openapi.baidu.com/oauth/2.0/token?grant_type=client_credentials&client_id={0}&client_secret={1}",
                api_key, secret_Key);
        UnityWebRequest unityWebRequest = UnityWebRequest.Get(uri);
        yield return unityWebRequest.SendWebRequest();
        if (unityWebRequest.isDone)
        {
            Match match = Regex.Match(unityWebRequest.downloadHandler.text, @"access_token.:.(.*?).,");
            if (match.Success)
            {
                Debug.Log("Token已经匹配");
                accessToken = match.Groups[1].ToString();
            }
            else
            {
                Debug.Log("验证错误,获取AccessToken失败!!!");
            }
        }
    }
}

演示效果：

成功播放合成的声音，本篇结束。这只是最基本的调用百度API的操作，下一篇就是调用百度的自然处理语言的API实现智能对话，之后还会对Unity关于调用Android SDK的操作进行总结，使用unity制作一个智能语音助手（陪聊）的软件。