A wrapper around Amazon Polly to make text-to-speech in nodejs super simple.

polly.js

'use strict'

/*

   first install the following node modules:

       npm install aws-sdk
       npm install stream
       npm install speaker

   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 a file in the following location:

       ~/.aws/credentials (c:\users\USER_NAME\.aws\credentials on Windows)

   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 aws     = require ('aws-sdk');
const stream  = require ('stream');
const speaker = require ('speaker');

// --- constants

const DEFAULT_VOICE  = /* The lovely */ 'Amy';
const SPEAKER_CONFIG = { channels: 1, bitDepth: 16, sampleRate: 16000 };

// --- the polly class

function Polly (region)
{
    this._polly = new aws.Polly ({region: region});
    this._voice = DEFAULT_VOICE;

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

    this.say = function (speech, callback)
    {
        var utterance = { OutputFormat: 'pcm', VoiceId: this._voice, Text: speech };

        this._polly.synthesizeSpeech (utterance, (error, data) =>
        {
            if (!error && data && data.AudioStream instanceof Buffer)
            {
                var buffer = new stream.PassThrough ();
                var player = new speaker (SPEAKER_CONFIG);

                buffer.end (data.AudioStream);
                buffer.pipe (player);

                player.on ('finish', function ()
                {
                    buffer.unpipe (player);
                    buffer.end ();
                    player.close ();

                    if (callback)
                    {
                        callback ();
                    }
                });
            }
        });
    }
}

// --- example usage

var polly = new Polly ('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 want a lighter version, which does not require the full AWS-SDK, check out my leaner gist.

This reads only the first line with node js 8.10.0 on Windows 10. The program exits before Brian gets to speak.

Ok. I figured out that this works if you switch back to npm install speaker@0.4.0. The newest version 0.4.1 breaks this code.

Thank you for creating this Pete!

it doesn't work. i cannot do 'npm install speaker'
i got error. how can i install speaker. if possible, please let us know. thanks

See the comment i just posted below the gist: https://gist.github.com/pete-rai/dc894c13f11de6e9634eb3379fb39c3b Let me know how you get on

On 2020-02-26 14:06, ij0209 wrote: it doesn't work. i cannot do 'npm install speaker' i got error. how can i install speaker. if possible, please let us know. thanks -- 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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