代码改变世界

如何开发一个在线朗读的功能----科大讯飞语音合成实战

2020-04-21 14:18  stoneniqiu  阅读(1032)  评论(1编辑  收藏

-- 很久没写技术博客,心血来潮,准备继续捡起。

起因

天天学习强国,不过强国APP的语音朗读不错,了解之后是科大讯飞支持的,于是开始撸码。https://www.xfyun.cn/doc/tts/online_tts/API.html

注册为开发者,接口要求这些我就不赘述了,文档里面写的清楚。当然具体实现是另外一回事。

听了一下效果,怎么说呢,免费的和特色的还是有很大的差别的,免费的是刚好让你能忍的那个级别,特色的和真人差别不大。看了一下收费,分为两部分,一部分是接口费用,一部分是特色发音人的费用。基于撸码的习惯,一切先从免费开始。

 

 

  详情请看这里:https://www.xfyun.cn/services/online_tts

 开干

看了一圈没有C#的demo,这就尴尬了,虽然是有文档,但是大家都懂,好比微信公众号的开发文档,要变成实际的代码,看得见的应用那是要废一番功夫的。找了一番之后,终于发现一个开源的项目刚发布没多久,真是喜出望外就开干了: https://github.com/zuiyuewentian/XunFeiNETSDK

讯飞的这个接口是基于websock的,我们先用控制台程序做一个demo。C#其实自带了websocket,不过这里用的是WebSocketSharp,这个我觉得很好,System.Net.WebSockets.WebSocket 是基于异步方法的,后面我会讲到,而WebSocketSharp.WebSocket 是基于事件的,很符合前端的编程习惯。

websocket = new WebSocketSharp.WebSocket(reqUrl);
                websocket.OnMessage += Websocket_OnMessage;
                websocket.OnOpen += Websocket_OnOpen;
                websocket.Connect();

讯飞的服务器收到我们的文字内容后,会以流的形势把音频传回来,在我们的服务器上把这种流转成文件即可。

 private static Stopwatch stopwatch;
        public static void Main(string[] args)
        {
            //text要合成的文字,pathUrl域名
            stopwatch = new Stopwatch();
            stopwatch.Start();
            var xunFeiNetSdk = new XunFeiTTS();
            xunFeiNetSdk.MessageUpdate_Event += XunFeiNetSdk_MessageUpdate_Event;
            xunFeiNetSdk.SendData("张家界荷花国际机场,北京大兴机场,长沙黄花机场,邵阳武冈机场,所有航班全部复航!");
            Console.Read();
        }

        static byte[] data = new byte[0];
        private static void XunFeiNetSdk_MessageUpdate_Event(TTS_Data_Model message, string error = null)
        {

            if (error != null)
            {
                Console.WriteLine(error);
                return;
            }

            try
            {
                //合成结束
                if (message.status == 2)
                {
                    Console.WriteLine("合成成功");
                    string voice = string.Format("{0}.wav", DateTime.Now.ToString("yyyyMMddHHmmssfff"));

                    Console.WriteLine("正在保存..."+voice);
                    
                    data = data.Concat(message.audioStream).ToArray();

                    var mWavWriter = new WaveFileWriter(voice, new WaveFormat(16000, 1));
                    mWavWriter.Write(data, 0, data.Length);
                    mWavWriter.Close();
                    mWavWriter.Dispose();
                    Console.WriteLine("保存成功...");
                    var sp = stopwatch.Elapsed;

                    Console.WriteLine("用时" + sp);


                }
                else
                {
                    data = data.Concat(message.audioStream).ToArray();
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }

    }

文件的存储用的是NAudio,XunFeiNETSDK里面的代码我独立出来。

(最近2个月航班太少了,工资骤减,原谅我说出我的内心话) 

这样就得到了语音了。听一听,还能接受。但是怎么做到web页面里面呢?

改造成web应用

首先的思路是,前端把文字发过来,然后交给sdk去获取音频,得到文件的地址后返回给前端。所以最合适的方案还是前端也用websocket,因为发送消息和收到消息是分开的。那么这又需要后端有一个websocket服务了

 

我又不想单独去开一个websocket服务,那就可以将这个websocket做成api的形式,如下:

namespace HHOA.MVC5.Controllers.API
{
    [RoutePrefix("api/msg")]
    public class MsgApiController : ApiController
    {
        private static List<WebSocket> _sockets = new List<WebSocket>();
        private readonly  XunFeiTTS _xunFei;
        private WebSocket currentSocket = null;

        public MsgApiController()
        {
            _xunFei = new XunFeiTTS();
            _xunFei.MessageUpdate_Event += XunFeiNetSdk_MessageUpdate_Event;
            Logger.Info("启动XunFeiTTS");
            
        }


        private byte[] data = new byte[0];
        private void XunFeiNetSdk_MessageUpdate_Event(TTS_Data_Model message, string error = null)
        {

            if (error != null)
            {
                Console.WriteLine(error);
                return;
            }
            WaveFileWriter mWavWriter=null;
            try
            {
                //合成结束
                if (message.status == 2)
                {
                    Logger.Info("合成成功");
                    var savePath = HostingEnvironment.MapPath("~/Files/Voice/");
                    string diff = DateTime.Now.ToString("yyyyMMddHHmmssfff");
                    string voice = string.Format("{0}.wav", diff);

                    var filePath = savePath + voice;

                    var di = new DirectoryInfo(savePath);
                    if (!di.Exists) { di.Create(); }

                    var webPath = "/Files/Voice/" + voice;


                    Logger.Info("正在保存..." + filePath);

                    data = data.Concat(message.audioStream).ToArray();

                     mWavWriter = new WaveFileWriter(filePath, new WaveFormat(16000, 1));
                    mWavWriter.Write(data, 0, data.Length);
                    mWavWriter.Close();
                    mWavWriter.Dispose();

                    Logger.Info("保存成功...");

                    //将音频地址发给前端
                    if (currentSocket != null && currentSocket.State == WebSocketState.Open)
                    {
                        var recvBytes = Encoding.UTF8.GetBytes("voice:" + webPath);
                        var sendBuffer = new ArraySegment<byte>(recvBytes);
                        currentSocket.SendAsync(sendBuffer, WebSocketMessageType.Text, true, CancellationToken.None);
                    }

                }
                else
                {
                    data = data.Concat(message.audioStream).ToArray();
                }
            }
            catch (Exception ex)
            {
                if (mWavWriter != null)
                {
                    mWavWriter.Dispose();
                }
                Logger.Debug(ex.Message);
            }
        }




        [Route]
        [HttpGet]
        public HttpResponseMessage Connect()
        {
            HttpContext.Current.AcceptWebSocketRequest(ProcessRequest); //在服务器端接受Web Socket请求,传入的函数作为Web Socket的处理函数,待Web Socket建立后该函数会被调用,在该函数中可以对Web Socket进行消息收发

            return Request.CreateResponse(HttpStatusCode.SwitchingProtocols); //构造同意切换至Web Socket的Response.
        }

        public async Task ProcessRequest(AspNetWebSocketContext context)
        {
            var socket = context.WebSocket;//传入的context中有当前的web socket对象
            _sockets.Add(socket);//此处将web socket对象加入一个静态列表中

            //进入一个无限循环,当web socket close是循环结束
            while (true)
            {
                var buffer = new ArraySegment<byte>(new byte[1024]);
                var receivedResult = await socket.ReceiveAsync(buffer, CancellationToken.None);//对web socket进行异步接收数据
                if (receivedResult.MessageType == WebSocketMessageType.Close)
                {
                    await socket.CloseAsync(WebSocketCloseStatus.Empty, string.Empty, CancellationToken.None);//如果client发起close请求,对client进行ack
                    _sockets.Remove(socket);
                    break;
                }

                if (socket.State == WebSocketState.Open)
                {
                    //收到了消息
                    string recvMsg = Encoding.UTF8.GetString(buffer.Array, 0, receivedResult.Count);
                    //将这个消息发送给xf
                    Logger.Info("收到消息:"+recvMsg);
                    _xunFei.SendData(recvMsg);


                    var recvBytes = Encoding.UTF8.GetBytes(recvMsg);
                    var sendBuffer = new ArraySegment<byte>(buffer.Array);
                    currentSocket = socket;

                    await socket.SendAsync(sendBuffer, WebSocketMessageType.Text, true, CancellationToken.None);

                 
                }
            }
        }
    }

}
View Code
 var webSocket;
        var player = document.getElementById("player");
        function sendSocketMsg() {
            var msg = $("#msg").val();
            webSocket.send(msg);
            showMsg("发送消息:" + msg, "blue");
        }

        openSocket();

        function openSocket() {
            if (webSocket != null && typeof (webSocket) != "undefined") {
                closeSocket();
            }
            webSocket = new WebSocket("ws://" + location.hostname + ":" + location.port + "/api/msg");
            webSocket.onopen = function () {
                showMsg("连接建立");
            }
            webSocket.onerror = function () {
                showMsg("发生异常");
            }

            webSocket.onmessage = function (event) {
                showMsg("收到消息:" + event.data, "yellow");
                if (event.data.indexOf("voice:") > -1) {
                    var src = event.data.split("voice:")[1];
                    player.src = src;
                    player.play();
                }
            }

            webSocket.onclose = function () {
                showMsg("连接关闭");
            }
        }

        function closeSocket() {
            if (webSocket != null && typeof (webSocket) != "undefined") {
                webSocket.close();
            }
        }

        function showMsg(msg, type) {
            if (type === null || typeof (type) === "undefined") type = "gray";
            $("#show").append("<span class='" + type + "'>" + msg + "</span><br>");
        }

这样就得到产品的雏形了。后续要考虑的是文字的长短、音频播放器的展示效果,还能换一下播放的声音等等,每次给你说一个功能,其实这个功能背后有太多细节了。

 Console版源码:https://download.csdn.net/download/stoneniqiu/12347028 

 Web版源码:https://download.csdn.net/download/stoneniqiu/12347167 

没有积分的可以关注我的订阅号,回复语音合成。