Proposal: Implement getting audio output from window.speechSynthesis.speak() call as Blob or other data type proposal/addition needs implementer interest

[guest271314]

Get audio output from window.speechSynthesis.speak() call as ArrayBuffer, AudioBuffer, Blob, MediaSource, MediaStream, ReadableStream, other object or data types.

Ideally, the implementation can be performed without workaround of using navigator.mediaDevices.getUserMedia() and MediaRecorder().

Relevant bug for Firefox https://bugzilla.mozilla.org/show_bug.cgi?id=1377816. Feature request for Chromium
https://bugs.chromium.org/p/chromium/issues/detail?id=733051#c3. Workaround
so far at github https://github.com/guest271314/SpeechSynthesisRecorder. It
took a while to determine that Monitor of Built-in Audio was necessary
instead of Built-in Audio at .getUserMedia() prompt.

Three widely applicable and appropriate use cases which are at the forefront are

1. Persons who have issues speaking; i.e.g., persons whom have suffered a
   stroke or other communication inhibiting afflictions. They could convert
   text to an audio file and send the file to another individual or group.
   This feature would go towards helping them communicate with other persons,
   similar to the technologies which assist Stephen Hawking communicate;

2. Presently, the only person who can hear the audio output is the person
   in front of the browser; in essence, not utilizing the full potential of
   the text to speech functionality. The audio result can be used as an
   attachment within an email; media stream; chat system; or other
   communication application. That is, control over the generated audio output;

3. Another application would be to provide a free, libre, open source audio
   dictionary and translation service - client to client and client to server,
   server to client.

Those are the main three use cases. There are others that can fathom;
though the above should be adequate to cover a wide range of users of the
implementation.

If, in your or your organizations' view, those use cases are not compelling
or detailed enough, please advise and will compose a more thorough analysis
and proposal.

The current workaround is cumbersome. Why should we have to use
navigator.mediaDevices.getUserMedia() and MediaRecorder to get the audio
output? It is not as if the workaround is impossible to achieve, though why
are we needing to use two additional methods to get audio as a static file?

At a minimum we should be able to get a Blob or ArrayBuffer of the
generated audio. The Blob or ArrayBuffer could, generally, be converted to
other formats, if necessary. For example meSpeak.js already provides the
described functionality http://plnkr.co/edit/ZShBbiFGEKIJX2WgErkl?p=preview
.
Re: MediaStream, ArrayBuffer, Blob audio result from speak() for recording?

[domenic]

This specification does not define speechSynthesis, so I'll close this issue. Please feel free to open it on the repository of whatever specification does define that API.