Javascript - 如何获得更多的文本语音转换声音？

Question

我制作了这个小脚本，您可以在其中输入一些消息，它会读出它。

我通过使用 FireFox SpeechSynthesis API 解决了这个问题。

如何获得更多声音并支持更多语言？

Note: There is a "bug" in SO. If I edit my question and edit the script and test it from there, then 4 voices are loading. If I run the code snippet normally, then no voices are loading, but the default voice.

if ('speechSynthesis' in window) {
 // Speech Synthesis supported
} else {
  // Speech Synthesis Not Supported
  alert("Sorry, your browser doesn't support text to speech!");
}

const voices = speechSynthesis.getVoices();
populateVoiceList();

if (typeof speechSynthesis !== 'undefined' && speechSynthesis.onvoiceschanged !== undefined) {
  speechSynthesis.onvoiceschanged = populateVoiceList;
}

var selectedLang = $("#voiceSelect").find("option").attr("data-lang");
var selectedVoice = $("#voiceSelect").find("option").attr("data-pos");

$("#voiceSelect").change(function() {
   selectedLang = $(this).find("option:selected").attr("data-lang");
   selectedVoice = $(this).find("option:selected").attr("data-pos");
});

$("#start").click(function() {
    var msg = new SpeechSynthesisUtterance();

    msg.text = $("#message").val();
    msg.lang = selectedLang;
    msg.voice = voices[selectedVoice];
 
    console.log(msg);

    window.speechSynthesis.speak(msg);
});

// Hide Dropdown if there is only one voice
if ($("#voiceSelect option").length == 0) {
    $("#voiceSelect").hide();
}

function populateVoiceList()
{
  if (typeof speechSynthesis === 'undefined') {
    return;
  }
  
  for (let i = 0; i < voices.length; i++) {
    const option = document.createElement('option');
    option.textContent = `${voices[i].name} (${voices[i].lang})`;

    if (voices[i].default) {
      option.textContent += ' — DEFAULT';
    }

    option.setAttribute('data-lang', voices[i].lang);
    option.setAttribute('data-name', voices[i].name);
    option.setAttribute('data-voice-uri', voices[i].voiceURI);
    option.setAttribute('data-pos', i);

    document.getElementById("voiceSelect").appendChild(option);
  }
}

.flex-container {
    display: flex;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<select id="voiceSelect"></select>
<div class="flex-container">
    <textarea id="message" value="test"></textarea>
    <button id="start">Start</button>
</div>

JSFiddle

Answer 1

How can I get more voices and support for more languages?

目前还没有浏览器 vendor 支持加载自定义/更多语音。它似乎也不是新生规范的一部分，因为有一个 open issue asking how to add more voices .

声音列表取决于用户代理/设备，因为它就是这样的 specified 。用户代理使用设备操作系统提供的 native 语音引擎或基于网络的语音引擎，每个引擎都与一组支持的语音一起工作。这是comment from a chromium issue about not being able to support boundary events由于基于 native /网络的语音引擎缺少功能，作为 Web 语音 API 所依赖的平台的示例。

如果您想查看各种设备/浏览器可以使用哪些语音，您可以访问https://morganney.github.io/tts-react/?path=/story/tts-react--hook然后点击“加载”按钮即可获取 HTML <select> SpeechSynthesisVoice的支持。

您还可以运行下面的代码片段来查看可用的声音:

let voices = []
const btn = document.getElementById('load')
const options = document.getElementById('voices')
const hasSynth = 'speechSynthesis' in window

if (hasSynth) {
  voices = speechSynthesis.getVoices()
  
  speechSynthesis.addEventListener('voiceschanged', () => {
    voices = speechSynthesis.getVoices()
  })
}

btn.addEventListener('click', () => {
  const initOpt = document.createElement('option')

  if (!voices.length && hasSynth) {
    voices = speechSynthesis.getVoices()
  }
 
  initOpt.append(document.createTextNode('-- select voice --'))
  options.append(initOpt)

  voices.forEach(voice => {
    const option = document.createElement('option')
 
    option.value = voice.name
    option.append(document.createTextNode(`${voice.lang} - ${voice.name}`))
    options.append(option)
  })
  
  options.style.display = 'inline'
})

options.addEventListener('change', (evt) => {
  if (hasSynth) {
    const utterance = new SpeechSynthesisUtterance()

    utterance.text = 'Testing the selected voice.'
    utterance.voice = voices.find(voice => voice.name === evt.target.value)
    
    speechSynthesis.speak(utterance)
  }
})

#voices {
  display: none;
}

<button id="load">click to load voices</button>
<select id="voices">
</select>