HomoFast-eSpeak-Persian/chromium_extension

Motivation

Web Speech API does not support SSML input to the speech synthesis engine https://github.com/WICG/speech-api/issues/10, or the ability to capture the output of speechSynthesis.speak() as aMedaiStreamTrack or raw audio https://lists.w3.org/Archives/Public/public-speech-api/2017Jun/0000.html.

See Issue 1115640: [FUGU] NativeTransferableStream.

Synopsis

Native Messaging => eSpeak NG => PHP passthru() => fetch() => Transferable Streams => MediaStreamTrack.

Use local espeak-ng with -m option set in the browser.

Output speech sythesis audio as a live MediaStreamTrack.

Use Native Messaging, PHP passthru() to input text and Speech Synthesis Markup Language as STDIN to espeak-ng, stream STDOUT in “real-time” as live MediaStreamTrack.

Install

Dependencies

eSpeak NG [Building eSpeak NG](https://github.com/espeak-ng/espeak-ng/blob/master/docs/building.md#building-espeak-ng). PHP is used for `passthru()`. Substitute server language of choice. ``` git clone https://github.com/guest271314/native-messaging-espeak-ng.git cd native-messaging-espeak-ng/ chmod +x local_server.sh index.php ``` Navigate to `chrome://extensions`, set `Developer mode` to on, click `Load unpacked`, select downloaded git directory. Note the generated extension ID, substitute that value for `` in `native_messaging_espeakng.json`, `AudioStream.js`, `index.php`; add the value to `"extensions"` array in `manifest.json`. Substitute full local path to `local_server.sh` for `/path/to` in `native_messaging_espeakng.json`. Copy `native_messaging_espeakng.json` to `NativeMessagingHosts` directory in Chromium or Chrome configuration folder, on Linux, i.e., `~/.config/chromium`; `~/.config/google-chrome-unstable`. `cp native_messaging_espeakng ~/.config/chromium/NativeMessagingHosts` Reload extension.

Usage

On origins listed in "matches" array in "web_accessible_resources" object in manifest.json, e.g., at console

var text = `Test`;
var stdin = `espeak-ng -m --stdout "${text}"`;
var espeakng = new AudioStream({ stdin, recorder: true });
// espeakng.mediaStream: MediaStream containing MediaStreamTrack source output of espeak-ng --stdout
var ab = await espeakng.start();
console.log(
  URL.createObjectURL(new Blob([ab], { type: 'audio/webm;codecs=opus' }))
);

Abort the request and audio output.

await espeakng.abort()

To turn local server on and off with user action pin and click the extension icon on Chromium or Chrome toolbar.