On Chrome OS, you can enable spoken feedback (ChromeVox) by pressing Ctrl+Alt+Z.
If you have a Chromebook, this gives you speech support built-in. If you're building Chrome from source and running it on desktop Linux, speech and braille won't be included by default. Here's how to enable it.
First follow the public instructions for Chrome checkout and build.
Edit .gclient (in chromium/) and at the bottom add:
target_os = ["chromeos"]
Run gclient sync to update your checkout.
Then create a GN configuration with "chromeos" as the target OS, for example:
gn args out/cros
...in editor, add this line:
target_os = "chromeos"
is_component_build = true
is_debug = false
Note: Only target_os = "chromeos" is required, the others are recommended
for a good experience but you can configure Chrome however you like otherwise.
Note that Native Client is required, so do not put enable_nacl = false in
your file anywhere!
Now build Chrome as usual, e.g.:
autoninja -C out/cros chrome
And run it as usual to see a mostly-complete Chrome OS desktop inside of a window:
out/cros/chrome
By default you'll be logged in as the default user. If you want to simulate the login manager too, run it like this:
out/cros/chrome --login-manager
You can run any of the above under it’s own X session (avoiding any window manager key combo conflicts) by doing something like
startx out/cros/chrome
NOTE: if you decide to run Chrome OS under linux within a window manager, you are subject to its keybindings which will most certainly conflict with ChromeVox. The Search key (which gets mapped from LWIN/key code 91), usually gets assigned to numerous shortcut combinations. You can manually disable all such combinations, or run under X as described above.
If you want speech, you just need to copy the speech synthesis data files to /usr/share like it would be on a Chrome OS device:
sudo git clone https://chromium.googlesource.com/chromiumos/platform/assets /usr/share/chromeos-assets
Change the permissions:
sudo find /usr/share/chromeos-assets -type f -exec chmod 644 {} \;
sudo find /usr/share/chromeos-assets -type d -exec chmod 755 {} \;
Next, unzip the NaCl executables. You only need to do the one for your host architecture:
PATTS_DIR=/usr/share/chromeos-assets/speech_synthesis/patts
sudo unzip $PATTS_DIR/tts_service_x86_64.nexe.zip -d $PATTS_DIR
You may need to update permissions for the unzipped files within within speech_synthesis/patts:
sudo find $PATTS_DIR -type f -exec chmod 755 {} \;
Be sure to check permissions of /usr/share/chromeos-assets, some users report they need to chmod or chown too, it really depends on your system.
After you do that, just run "chrome" as above (e.g. out/cros/chrome) and press Ctrl+Alt+Z, and you should hear it speak! If not, check the logs.
To get eSpeak on Chrome OS on Desktop Linux, copy the eSpeak extension (chrome branch) to the same place:
cd ~
git clone https://chromium.googlesource.com/chromiumos/third_party/espeak-ng
cd espeak-ng
git checkout chrome
sudo cp -r chrome-extension /usr/share/chromeos-assets/speech_synthesis/espeak-ng
ChromeVox uses extension APIs to deliver braille to Brltty through libbrlapi and uses Liblouis to perform translation and backtranslation.
Once built, Chrome and ChromeVox will use your machine’s running Brltty daemon to display braille if ChromeVox is running. Simply ensure you have a display connected before running Chrome and that Brltty is running.
Note you may need to customize brltty.conf (typically found in /etc). In particular, the api-parameters Auth param may exclude the current user. You can turn this off by doing: api-parameters Auth=none
Testing against the latest releases of Brltty (e.g. 5.4 at time of writing) is encouraged.
For more general information, see ChromeVox
ChromeVox keyboard shortcuts use Search. On Linux that's usually your Windows key. If some shortcuts don't work, you may need to remove Gnome keyboard shortcut bindings, or use "startx", as suggested above, or remap it.
- Search+Space: Click
- Search+Left/Right: navigate linearly
- Search+Period: Open ChromeVox menus
- Search+H: jump to next heading on page