Native Messaging => Deno local server => espeak-ng => MediaStreamTrack in browser

[guest271314]

Use Native Messaging to start and stop a local Deno HTTPS server, POST espeak-ng command with input text or SSML (Web Speech API does not support processing SSML input to window.speechSynthesis.speak(), or capturing audio output from the speak() call), get WAV back in response, turn off local server, create a MediaStreamTrack from espeak-ng stdout https://github.com/guest271314/native-messaging-espeak-ng/tree/deno-server.

We do no install the deno executable. We just fetch the executable with wget to use JavaScript as our local HTTPS server, which we can make requests to from any Web URL we set. We could alternative fetch the zip file and extract it using Web API's and fetch().

The same source code can be used to start and start your own local HTTPS server to pass arbitrary commands to any local applications and shell scripts, and stream the output back to the browser.

Have fun using SSML input to the espeak-ng speech synthesis engine and streaming the audio output as a MediaStreamTrack locally or to peers using WebRTC. Cheers!