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Re: Espeak Server Likes PulseAudio?



Do you mind sharing what you found out or providing a pointer to this suggested configuration?

On 04/01/2013 11:30 AM, Steve Holmes wrote:
Well after two days of messing around and reading some write-ups for
ArchLinux concerning PulseAudio, I founhd a suggested configuration to
alter Pulse so it and ALSA function side by side now and I can use
Emacspeak, Speakup and Gnome with Speech Dispatcher without any speech
losses.  Also tim, I have not experienced any stability issues with
the emacspeak espeak server other than while I was battling with Pulse
and all.  It is using the pulse driver but I notice that espeak
natively is also calling up pulseaudio.c but what's strange is
espeakup does not; espeakup probably calls the espeak library function
directly and that appears to go through ALSA.  Anyway, I seem to have
all these environments working now and hopefully this "house of cards"
won't collaps on me:).  I sure wish the Linux sound system were a lot
simpler than all this.

On 3/30/13, T.V. Raman <tv.raman.tv@gmail.com> wrote:
Jason, You have articulated part of the issue correctly. The
other reason why the pulseaudio / alsa combination gives such
vastly varying results is that the layering is complex;  See
Tim's earlier note.  If you have pulseaudio on a system, do an
aplay -v of a .wav file and look at the output -- you'll see the
audio buffers getting routed through multiple layers.  Now,
depending on the soundcard and the memory buffer size it needs,
sample conversions ... this can  go horribly wrong when you
generate a lot of rapid audio requests -- something that happens
with emacspeak a lot if you perform actions that both produce
speech and a rapid sequence of auditory icons.  For the record,
the first thing I did on my work machines after upgrading to
Precise was to nuke pulseaudio -- that is getting harder and
harder to do --
"Jason" == Jason White <jason@jasonjgw.net> writes:
     Jason> Tim Cross <theophilusx@gmail.com> wrote:
     >> Note that there should be no problems with alsa and
     >> pulseaudio. Pulseaudio is not a replacement for alsa. It
     >> is another abstraction layer on top of it and pulseaudio
     >> needs alsa
     Jason>
     Jason> Part of the problem might be that PulseAudio holds
     Jason> devices open even when not in use, so that
     Jason> applications which access the Alsa layer directly fail
     Jason> to open audio devices.
     Jason>
     Jason> As I remember, there is a way to configure PulseAudio
     Jason> to relinquish devices temporarily that aren't being
     Jason> used by applications.
     Jason>
     Jason> With apologies in advance if I am wrong in the above -
     Jason> it's a while since I read about these issues.
     Jason>
     Jason>
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     Jason> "unsubscribe" or "help".

--
Best Regards,
--raman

--
Best Regards,
--raman

--
Best Regards,
--raman


On 3/29/13, Jason White <jason@jasonjgw.net> wrote:
Tim Cross <theophilusx@gmail.com> wrote:

Note that there should be no problems with alsa and pulseaudio.
Pulseaudio
is not a replacement for alsa. It is another abstraction layer on top of
it
and pulseaudio needs alsa

Part of the problem might be that PulseAudio holds devices open even when
not
in use, so that applications which access the Alsa layer directly fail to
open
audio devices.

As I remember, there is a way to configure PulseAudio to relinquish
devices
temporarily that aren't being used by applications.

With apologies in advance if I am wrong in the above - it's a while since
I
read about these issues.

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--
Christopher (CJ)
chaltain at Gmail

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