Speech synthesis processing is not shipped in Chromium source code.
Ordinarily, in order to use speech synthesis at Chromium a speech
synthesis engine needs to be installed, for example, espeak or espeak-
ng, and speech-dispatch needs to be installed
$ sudo apt install python3-speechd
then launch Chromium with
--enable-speech-dispatcher
flag.
However, no voices are loaded at snap version of Chromium at
Chromium 85.0.4183.102 (Official Build) snap (64-bit)
Revision
ffe848af6a5df4fa127e2929331116b7f9f1cb30-refs/branch-heads/4183@{#1770}
OS Linux
Chromium from https://download-chromium.appspot.com/
Chromium 87.0.4268.0 (Developer Build) custom (64-bit)
Revision
b2793c4720e3daf929778440ff945eadf202b200-refs/heads/master@{#808630}
OS Linux
JavaScript V8 8.7.142
also has serious issues with Web Speech API implementation.
It should be possible to run
$ spd-conf
then edit the speech synthesis engine configuration file to modify
variations, which should be reflected in speechSynthesis.getVoices(),
however, that also does not currently work for non-snap Chromium, where
snap Chromium loads no voices at all.
Also, the queue to speech-dispatcher is severely broken at non-snap
Chromium, requiring executing speechSynthesis.cancel() to cycle through
the code that worked within the last few releases at
https://guest271314.github.io/SSMLParser/, where the code outputs the
expected result at Firefox 80 and Nightly 82.
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https://bugs.launchpad.net/bugs/1792300
Title:
Speech Synthesis Not Working
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