azure-tts.js

var azureCognitiveServicesMainEndpoint = 'https://northeurope.tts.speech.microsoft.com/cognitiveservices/v1';

function azureCallApi(text, callback) {
    var ssml = "<speak version='1.0' xmlns=\"http://www.w3.org/2001/10/synthesis\" xml:lang='en-US'>" +
        "<voice name='Microsoft Server Speech Text to Speech Voice (en-GB, George, Apollo)'>" +
        "<prosody rate=\"slow\">" +
        text +
        "</prosody>" +
        "</voice>" +
        "</speak>";
    console.log(ssml);
    azureGetAuthToken(function (err, token) {
        if (err) {
            callback(err, token);
            return;
        }
        var mp3file = tempfile(".mp3");
        var x = fs.createWriteStream(mp3file);
        var r = request({
            url: azureCognitiveServicesMainEndpoint,
            method: "POST",
            body: ssml,
            headers: {
                'Content-Type' : 'application/ssml+xml',
                'X-Microsoft-OutputFormat': 'audio-24khz-48kbitrate-mono-mp3',
                'User-Agent': 'Talking fish',
                'Authorization': 'Bearer ' + token
            }
        })
        .on('error', function(err) {
            callback(err, null);
        })
        .on('response', function(response) {
            if (response.statusCode != 200) {
                callback(response, null);
                return
            }
        })
        .pipe(x)
        .on('finish', function() {
            x.close();
            callback(null, mp3file);
        });
    });
}
// TODO - fix up error handling