Victor, I understand you to be saying that pulseaudio exhibits more latency 
than ALSA.

If this is so, why are we making pulseaudio the default for SoaS - where 
most audio will be realtime?

Art Hunkins

----- Original Message ----- 
From: "victor" 
To: 
Sent: Tuesday, September 08, 2009 2:55 AM
Subject: [Csnd] Re: Re: Re: Re: csound on Fedora 11 and rawhide


Badly.
----- Original Message ----- 
From: "Art Hunkins" 
To: 
Sent: Tuesday, September 08, 2009 3:48 AM
Subject: [Csnd] Re: Re: Re: csound on Fedora 11 and rawhide


> How do pulseaudio and ALSA compare in regard to latency?
>
> Art Hunkins
>
> ----- Original Message ----- 
> From: "Andres Cabrera" 
> To: 
> Sent: Monday, September 07, 2009 10:18 PM
> Subject: [Csnd] Re: Re: csound on Fedora 11 and rawhide
>
>
> Won't pulseaudio give unacceptable latency for tamtam?
>
> Cheers,
> Andrés
>
> On Mon, Sep 7, 2009 at 8:54 PM, Felipe Sateler  wrote:
>> Peter told me that TamTam needs to be rebuilt, but I do not know if that
>> is related to the problem you are experiencing.
>>
>> Can you play sounds through any other PulseAudio application?
>>
>> On Mon, 2009-09-07 at 20:46 -0400, Art Hunkins wrote:
>>> I'm really excited that Csound now seems to be working on 
>>> Sugar-on-a-Stick.
>>>
>>> I'm getting sound written to -odac, but unfortunately am still not 
>>> hearing
>>> audio. I imagine my problem is my audio setup.
>>>
>>> My  are:
>>> -odac -m0d --expression-opt -b128 -B2048
>>>
>>> This set of options work fine on the XO-1, which is of course Csound5.08
>>> with alsa as default rtaudio.
>>>
>>> SoaS default is now Pulseaudio, about which I know nothing; my log shows 
>>> it
>>> is being used, as expected.
>>>
>>> I noted that there were also "updates" available for pulseaudio and
>>> pulseaudio-libs. (I don't believe they were part of Soas Strawberry.) 
>>> Not
>>> knowing whether these are now needed, I installed them as well. Still no
>>> audio.
>>>
>>> FWIW, I'm on my WindowsXP system, which has several audio drivers 
>>> installed
>>> on it along with a specified (Windows) default. I've no idea if this
>>> matters.
>>>
>>> What am I missing? I assume it's something in .
>>>
>>> I'm hoping that for purposes of my Sugar activity, that the additional
>>> pulseaudio files will not need to be installed. For kids and their 
>>> teachers
>>> and support people, the less that needs to be done the better.
>>>
>>> Art Hunkins
>>>
>>> ----- Original Message -----
>>> From: "Peter Robinson" 
>>> To: "Art Hunkins" ; "Felipe Sateler" 
>>> 
>>> Cc: ; "Sugar devel"
>>> 
>>> Sent: Sunday, September 06, 2009 5:12 PM
>>> Subject: csound on Fedora 11 and rawhide
>>>
>>>
>>> > Hi All,
>>> >
>>> > I think (with the help of Felipe) and after around a million test
>>> > recompiles :-) I've finally fixed the issues with the csound python
>>> > bindings on Fedora. The build is now in rawhide and fedora-testing for
>>> > Fedora 11 as of today. The build that your after is 5.10.1-12. For me
>>> > at least it seems to work OK on Fedora 11 rawhide. PulseAudio is set
>>> > as the default. I would like to know how it looks to everyone else.
>>> >
>>> > Cheers,
>>> > Peter
>>>
>>
>
>
>
> -- 
>
>
> Andrés
>
>
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>
>
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On Tue, Sep 8, 2009 at 4:23 PM, Art Hunkins wrote:
> Victor, I understand you to be saying that pulseaudio exhibits more latency
> than ALSA.
>
> If this is so, why are we making pulseaudio the default for SoaS - where
> most audio will be realtime?

Because that's what Fedora and most other distros are moving to. Also
it does add more latency but not enough that most users will notice.
Even if you use alsa it will connect to the alsa pulse audio provider
which will basically add even more latency Csound -> PA alsa provider
-> PA -> ALSA -> kernel.

It works fine in most cases even for VoIP. What requires such low
latency as to be an issue in an environment such as a learning one.
Will the children notice a few milliseconds?

Peter