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

[Storm Dragon <stormdragon2976 gmail com>]

Hi,
I had the chance to test this earlier today. It works very well as far as I can tell.  Great job.

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On Mon, 2009-12-21 at 12:18 -0500, Bill Cox wrote:
> I've rewritten the speech-dispatcher pulseaudio driver, based on Lukes
> libio driver and what I saw in the ao source.  My new pulseaudio
> driver is only 177 lines, or about 1/10th of the old one.  It uses the
> pulseaudio "simple" interface, just like libao.
>
> The reason wrote this has to do with how ao sets up default buffering
> parameters.  By default, pulseaudio buffers up to two seconds of audio
> before beginning to play.  This is fine for playing music, but a
> disaster for a screen reader, where key echos are often too short to
> cause pulseaudio to start playing.  Unfortunately, the ao library is
> meant to be simple, and doesn't have low-level controls on things like
> how buffering works.  So, I rewrote pulse.c to link directly to the
> pulseaudio "simple" interface, where I was able to properly set
> buffering parameters for use with speech-dispatcher.
>
> I think this should become the default speech-dispatcher driver for
> Vinux/Lucid.  I've attached the pulse.c file, which should replace
> src/audio/pulse.c.  If you get a chance to test it, please let me know
> how it performs.  I know of no bugs when used with espeak for now.
>
> Bill
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