Re: [orca-list] [ANNOUNCE] libao (new audio driver for speechd including working pulseaudio support).

[Nolan Darilek <nolan thewordnerd info>]

Just managed to get this working and, wow, it's very fast. Looking 
forward to installing it on my netbook to see just how much faster I'll 
perceive that to run. It's already somewhat slower, and speech latency 
makes it seem more sluggish than it actually is.

I was pretty happy with the latency I received with the original patch, 
but I tried dropping the below #define to 32. It's even faster now. :) 
Might be worth giving this change a bit more testing and, assuming no 
one else reports problems with it, making it the default. Even if the 
original works better than any other Pulse solution out there, I doubt 
anyone would mind if it worked even better. :)

Thanks for this.



On 12/17/2009 09:23 AM, Marco Skambraks wrote:
> cool feedback - thanks
> if you want to try different settings for latency etc.
> you can change the define in speechd/src/audio/libao.c
> #define AO_SEND_BYTES 256
>
> if you reduce this value 128,64,32 ... and re-compile speechd
> you can generate a faster resonse play/stop
>
> the reason for me to create the patch was the alsa echo problem
> if speech-dispatcher gets new strings very rapidly
> the sound-output was a kind of a mixed speech output
> sounds lke an echo
> with libao and alsa there is no echo anymore :-)
>
> happy testing
>
> marco
>
>
> On Thu, 17 Dec 2009, Hammer Attila wrote:
>
> > Dear List,
> >
> > Halim, this driver is fantastic my machine.
> > I tested the new driver.
> > Before with this testing driver is publicated, Pulseaudio doing 2-3 
> > second latency when Speech-dispatcher is running in Ubuntu Karmic my 
> > notebook sound card and my desktop computer sound card.
> >
> > I need remove Pulseaudio and coming back with alsa and do lot of 
> > workarounds to solving problems (volume increase/decrease workaround 
> > with custom keybinding command with amixer, remove unneed pulseaudio 
> > packages if I would like listen musics, videos etc).
> >
> > Now when I testing the new driver, I am try the driver with Ubuntu 
> > Lucid system.
> >
> > What can I see after when all required steps I doing the driver 
> > installation?
> > I get back my fast speech navigation when Pulseaudio is running my 
> > notebook.
> > Only a very minimal latency I see when I typing, but this is not 
> > matter (not 3 second latency). :-):-) Alsa is possible very little 
> > faster. But the new testing driver is very stable. Tomorrow I testing 
> > longest time.
> >
> > What can I do when I would like compile and install the new driver?
> > Halim and me wroted 2 or 3 priwate letter, final, following simple 
> > method is working my machine. Note: Please, ewerybody try this method 
> > with only your risk!
> > Important, following method working with Karmic and Lucid only. 
> > Halim, if I any step writing incorrect, please complete. Excuse me my 
> > bad english:
> >
> > 1. In Lucid, I downloaded speech-dispatcher source code from 
> > following command with a directory:
> > sudo apt-get source speech-dispatcher
> >
> > 2. Please do following commands:
> > sudo apt-get install libao-dev (this is important)
> > sudo apt-get build-dep speech-dispatcher
> >
> > 3. I navigate the speech-dispatcher source directory.
> >
> > 4. Applyed the new patch:
> > patch -p1 <../speechd-libao.diff
> > Please replace the patch path if you storing Halim sent diff file 
> > with another place. :-):-)
> >
> > 5. I run dpkg-buildpackage command.
> >
> > 6. I installed with following packages with prewious directory (need 
> > do a sudo cd .. command):
> > speech-dispatcher, python-speechd, libspeechd2.
> > Possible your system needs another packages, but you found with 
> > rebuilded packages with your needs. Possible the version number is 
> > change with your system.
> >
> > 7. I change the /etc/libao.conf with default_driver=alsa to 
> > default_driver=pulse.
> >
> > 8. Final, reconfiguring speech-dispatcher with using libao audio 
> > output module. Don't worry, my machine spd-conf ask me the suggested 
> > way is Alsa, Pulse, Oss, but don't need correct your answer. :-):-)
> >
> > Enjoy, the new driver working my machine.
> >
> > Attila
> > _______________________________________________
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