Bing Text-To-Speech Client JavaScript Lib

A small JavaScript library to call Bing Text-To-Speech API

Prerequisites

You need a Web Audio compatible browser to use this library (MS Edge, Chrome, Safari, Firefox or Opera) and it needs also to support ES6/ES2015: http://kangax.github.io/compat-table/es6/.
Reference BingTTSClient.js in your HTML page.
Generate your Bing Speech API key:
- Free: https://www.microsoft.com/cognitive-services/en-us/subscriptions?productId=/products/Bing.Speech.Preview
- Paid: https://portal.azure.com/#create/Microsoft.CognitiveServices/apitype/Bing.Speech/pricingtier/S0

Usage

Constructor

// By default, it will use EN-US Male voice/locale
var bingClientTTS = new BingTTS.Client("YOUR_BING_SPEECH_API_KEY");

// You can change it
var bingClientTTS = new BingTTS.Client("YOUR_BING_SPEECH_API_KEY ", BingTTS.SupportedLocales.frFR_Male);

Speech with synthesize()

// Use the synthesize function to speech, it will use the locale set in the constructor by default
// For instance, this will use the EN-US male voice/locale on both sentences
var bingClientTTS = new BingTTS.Client("YOUR_BING_SPEECH_API_KEY ");
bingClientTTS.synthesize("Hello, my name is Mat, I'm glad to meet you.");
bingClientTTS.synthesize("How are you?");

Overriding locale

// But you can override it anytime like that
var bingClientTTS = new BingTTS.Client("YOUR_BING_SPEECH_API_KEY ");
bingClientTTS.synthesize("Hello, my name is Mat.");
bingClientTTS.synthesize("Salut, je m'appelle David.", BingTTS.SupportedLocales.frFR_Female);
bingClientTTS.synthesize("Hallo, mein Name ist Frank.", BingTTS.SupportedLocales.deDE_Male);
bingClientTTS.synthesize("Zdravstvuite, menya zovut Kristina i ya rada vas privetstvovat'", BingTTS.SupportedLocales.ruRU_Female);

Callback

// If you need a block of text to be read/speech before continuing, you can use the optional callback
// This code will download & play the 3 first sentences 
// Once the 3 sentences will be speech a new final XHR will be launched
// to download & play the last sentence using EN-GB Female.
bingClientTTS.synthesize("Hallo, mein Name ist Frank.", BingTTS.SupportedLocales.deDE_Male);
bingClientTTS.synthesize("Wie geht es Ihnen?", BingTTS.SupportedLocales.deDE_Female);
bingClientTTS.synthesize("Zdravstvuite, menya zovut Kristina i ya rada vas privetstvovat'"
    , BingTTS.SupportedLocales.ruRU_Female
    , () => {
        bingClientTTS.synthesize("Even more later text to speech!", BingTTS.SupportedLocales.enGB_Female);
    });

By default, the library is sending multiple XHR in parallel to have better performance. But your text will be speech in the order of the calls to synthetize().

Still, if you’d like to serialize them to have a unique XHR being processed in background, you can change this flag to:

bingClientTTS.multipleXHR = false;

It can be useful for the free version of your Bing Speech account to avoid reaching the quota of number of requests / min too quickly.