很多时候在看文章的时候都会有自动朗读文章内容的功能，那么这种功能如何在h5上是怎么实现的呢，下面就拿我司一个基本需求作为线索，看是怎么一步一步实现的
需求提出
经过我司产品经理的想法，做出如下功能
1.自动朗读当前h5页面文章
竞品——》
调研发现，竞品h5是app原生实现，而我司都是h5实现文章阅读，所以开始进行h5的调研
对接科大讯飞在线语音合成
调研发现科大讯飞的在线语音合成可以基本提供相应功能，决定做一个demo来测试效果
1.控制台开通权限
2.阅读文档
具体代码如下
import axios from 'axios'
import * as md5 from './md5'
axios.defaults.withCredentials = true
let Appid = 'xxxxx'
let apiKey = 'xxxxxx'
let CurTime = Date.parse(new Date()) / 1000
let param = {
auf: 'audio/L16;rate=16000',
aue: 'lame',
voice_name: 'xiaoyan',
speed: '50',
volume: '50',
pitch: '50',
engine_type: 'intp65',
text_type: 'text'
}
let Base64 = {
encode: (str) => {
return btoa(encodeURIComponent(str).replace(/%([0-9A-F]{2})/g,
function toSolidBytes(match, p1) {
return String.fromCharCode('0x' + p1);
}));
},
decode: (str) => {
// Going backwards: from bytestream, to percent-encoding, to original string.
return decodeURIComponent(atob(str).split('').map(function (c) {
return '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2);
}).join(''));
}
}
let xp = Base64.encode(JSON.stringify(param))
let CheckSum = md5.hex_md5(apiKey + CurTime + xp)
let headers = {
'X-Appid': Appid,
'X-CurTime': CurTime,
'X-Param': xp,
'X-CheckSum': CheckSum,
'Content-Type': 'application/x-www-form-urlencoded; charset=utf-8'
}
export function getAloud (text) {
// let data = {
// text: encodeURI(text)
// }
var formdata = new FormData()
formdata.append('text', text)
return axios({
baseURL: window.location.href.includes('demo') ? 'https://api.xfyun.cn' : '/tts',
method: 'POST',
url: '/v1/service/v1/tts',
headers: {
...headers
},
data: formdata
})
}
经过测试，是返回二进制文件流了但是前端试了各种办法没有实现流的播放
node中间层
引入node中间层是考虑到文件可以存储，可以放到cdn上进行缓存，可以减少相似文章的请求科大讯飞接口，可以减少流量的产生，所以决定加入node中间层
ps：考拉阅读有node服务器作为一些中间层的处理。主要技术栈是node + koa2 + pm2
const md5 = require('../lib/md5.js')
const fs = require('fs')
const path = require('path')
const marked = require('marked')
const request = require('request')
let Appid = ''
let apiKey = ''
let CurTime
let param = {
auf: 'audio/L16;rate=16000',
aue: 'lame',
voice_name: 'x_yiping',
speed: '40',
volume: '50',
pitch: '50',
engine_type: 'intp65',
text_type: 'text'
}
var b = new Buffer(JSON.stringify(param));
let xp = b.toString('base64')
let CheckSum
let headers
exports.getAloud = async ctx => {
CurTime = Date.parse(new Date()) / 1000
CheckSum = md5.hex_md5(apiKey + CurTime + xp)
headers = {
'X-Appid': Appid,
'X-CurTime': CurTime,
'X-Param': xp,
'X-CheckSum': CheckSum,
'Content-Type': 'application/x-www-form-urlencoded; charset=utf-8'
}
let id = ctx.request.body.id
let text = ctx.request.body.text
console.log(ctx.query)
var postData = {
text: text
}
let r = request({
url: 'http://api.xfyun.cn/v1/service/v1/tts', // 请求的URL
method: 'POST', // 请求方法
headers: headers,
formData: postData
}, function (error, response, body) {
// console.log('error:', error); // Print the error if one occurred
// console.log('statusCode:', response && response.statusCode); // Print the response status code if a response was received
// console.log('body:', body); // Print the HTML for the Google homepage.
})
await new Promise((resolve, reject) => {
let filePath = path.join(__dirname, 'public/') + `/${id}.mp3`
const upStream = fs.createWriteStream(filePath)
r.pipe(upStream)
upStream.on('close', () => {
console.log('download finished');
resolve()
});
})
.then((res) => {
ctx.body = {
code: 200,
message: '语音合成成功',
data: {
url: 'https://fe.koalareading.com/file/' + id + '.mp3'
}
}
})
}主要运用request的管道流概念
把后台返回的二进制文件导入到流里面，在写入到文件里面
最后返回一个url给前端播放使用
此致，测试
//返回url。相同文章唯一id区分，可以缓存使用
https://fe.koalareading.com/file/1112.mp3需求demo完成