A lean wrapper around Amazon Polly (which doesn't need the full AWS-SDK) making text-to-speech in nodejs super simple.

polly.js

'use strict'

/*
   first install the following node modules:

       npm install aws4
       npm install https
       npm install querystring
       npm install speaker
       npm install lame
       npm install fs
       npm install ini

   if after running the sample, you get an error 'Illegal instruction: 4'
   then also do the following step, AFTER those above:

       npm install speaker --mpg123-backend=openal

   also sure that you have an accesible file which contains your aws
   credentials in this form:

       [default]
       aws_access_key_id = YOUR_ACCESS_KEY_ID
       aws_secret_access_key = YOUR_SECRET_ACCESS_KEY

    when all set-up, run the sample like this:

       node polly.js

*/

// --- dependencies

const aws4    = require ('aws4');
const https   = require ('https');
const query   = require ('querystring');
const speaker = require ('speaker');
const lame    = require ('lame');
const fs      = require ('fs');
const ini     = require ('ini');

// --- the polly class

function Polly (credentials, region)
{
    var config = ini.parse (fs.readFileSync (credentials, 'utf-8'));

    this._key = { accessKeyId: config.default.aws_access_key_id, secretAccessKey: config.default.aws_secret_access_key };
    this._say = { OutputFormat: 'mp3', VoiceId: 'Amy' };
    this._req = { service: 'polly', region: region, signQuery: true };
    this._spk = { channels: 1, bitDepth: 16, sampleRate: 22050 };

    this.voice = function (voice)  // see https://docs.aws.amazon.com/polly/latest/dg/voicelist.html
    {
        this._say.VoiceId = voice;
    }

    this.say = function (utterance, callback)
    {
        this._say.Text = utterance;
        this._req.path = '/v1/speech?' + query.stringify (this._say);

        https.request (aws4.sign (this._req, this._key), function (audio)
        {
            audio.pipe (lame.Decoder ())
                 .pipe (new speaker (this._spk))
                 .on   ('finish', function ()
            {
                if (callback) callback ();
            });
        })
        .end();
    }
}

// --- example usage

var polly = new Polly ('./credentials', 'us-west-2');

console.log ();
console.log ('Ulysses by Sir Alfred Lord Tennyson');
console.log ();

polly.say ('We are not now that strength, which in old days moved Earth and heaven', function ()
{
    polly.voice ('Brian');

    polly.say ('That which we are we are. One equal temper of heroic hearts', function ()
    {
        polly.voice ('Emma');

        polly.say ('Made weak by time and fate, but strong in will', function ()
        {
            polly.voice ('Raveena');

            polly.say ('To strive, to seek, to find, and not to yield.');  // no callback here, as its optional
        });
    });
});

If you get an ugly compile error when installing 'npm i speaker', most likely cause is that you need to install libasound2-dev. On Ubuntu that is sudo apt install libasound2-dev

thank you pete-rai
but my os is window. i cannot do sudo apt install libasound2-dev.
then how can i install speaker well?

Windows is ugly. What errors do you get? Send more info please

On 2020-02-26 14:30, ij0209 wrote: thank you pete-rai but my os is window. i cannot do sudo apt install libasound2-dev. then how can i install speaker well? -- You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub [1], or unsubscribe [2].

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