the big jack bug... > crappy audio on XRUNS

the big jack bug... > crappy audio on XRUNS

[federico]

it happens randomly, while I play a soft synth, that jack XRUNs once, 
and the audio become crappy, noisy, like a kinda of digital 
effect....bit crusher?

then all synthesizers (all audio apps) sound the same sh*t...
i tried recording with ardour the output, and the output is clean, so I 
guess is a problem of sync or something that has to do with the hardware 
(soundcard).

in order to record this noise, i had to connect the soundcard output in 
its input and record it via analog in: 
http://xaero.ath.cx/jackbug_stereo.wav.bz2 (it is a stereo file, with 
the clean track panned on the left, and the dirty one on the right).

i hope it could be useful to debug the problem...
what other information I can provide useful for debug?
note that this happens with many version of alsa (1.0.9b, 1.0.10rc2, 
1.0.7 or less) and with many kernels (gentoo-sources (slightly patched 
for speed improvement), ck-sources, ck-sources+realtime-lsm)

i hope to solve this problem, since my audio desktop is unusable as si, 
since audio crasher after playng for just 5 minutes :(


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Re: the big jack bug... > crappy audio on XRUNS

[Jack O'Quin]

federico <xaero@inwind.it> writes:

> it happens randomly, while I play a soft synth, that jack XRUNs once,
> and the audio become crappy, noisy, like a kinda of digital
> effect....bit crusher?
>
> then all synthesizers (all audio apps) sound the same sh*t...
> i tried recording with ardour the output, and the output is clean, so
> I guess is a problem of sync or something that has to do with the
> hardware (soundcard).

This is likely a hardware problem.

Have you reported it on alsa-devel?  What card do you have?
-- 
  joq


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Re: [Jackit-devel] the big jack bug... > crappy audio on XRUNS

[federico]

Jack O'Quin ha scritto:

>federico <xaero@inwind.it> writes:
>
>  
>
>>it happens randomly, while I play a soft synth, that jack XRUNs once,
>>and the audio become crappy, noisy, like a kinda of digital
>>effect....bit crusher?
>>
>>then all synthesizers (all audio apps) sound the same sh*t...
>>i tried recording with ardour the output, and the output is clean, so
>>I guess is a problem of sync or something that has to do with the
>>hardware (soundcard).
>>    
>>
>
>This is likely a hardware problem.
>
>Have you reported it on alsa-devel?  What card do you have?
>  
>
it is an Echoaudio Gina24
the problem seems to came up more frequently with lower period sizes


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Re: Re: [Jackit-devel] the big jack bug... > crappy audio on XRUNS

[Giuliano Pochini]

On Sun, 6 Nov 2005, federico wrote:

> >>it happens randomly, while I play a soft synth, that jack XRUNs once,
> >>and the audio become crappy, noisy, like a kinda of digital
> >>effect....bit crusher?
> >>
> >>then all synthesizers (all audio apps) sound the same sh*t...
> >>i tried recording with ardour the output, and the output is clean, so
> >>I guess is a problem of sync or something that has to do with the
> >>hardware (soundcard).
> >>
> >
> >This is likely a hardware problem.
> >
> >Have you reported it on alsa-devel?  What card do you have?
> >
> >
> it is an Echoaudio Gina24
> the problem seems to came up more frequently with lower period sizes

It happened to me a lot of time ago before I discovered an hw quirk
(irq are generated at boundaries of 32 frames) and a driver bug (buffer
size was not an integer multiple of period size). After the fix, it never
happened anymore. I fixed it before the driver was merged into
alsa-driver. BTW, it was extremely difficult to reproduce and I never
undestood exactly why alsa wasn't able to recover from such a weird state.

I need to know: sample rate, # of running substreams, period and buffer
size of each substream, anything else you thing may be useful.


--
Giuliano.


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Re: [linux-audio-dev] the big jack bug... > crappy audio on XRUNS

[Lee Revell]

On Sun, 2005-11-06 at 16:48 +0100, federico wrote:
> it happens randomly, while I play a soft synth, that jack XRUNs once, 
> and the audio become crappy, noisy, like a kinda of digital 
> effect....bit crusher?

It's probably a driver bug but could also be a PCI latency issue.

Try setpci -d CARD:ID latency_timer=40 where CARD:ID is the PCI id of
the card obtained from lspci.  Do this immediately after loading the
driver and before playing any audio.

Lee



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Re: Re: [linux-audio-dev] the big jack bug... > crappy audio on XRUNS

[Giuliano Pochini]

On Sun, 6 Nov 2005, Lee Revell wrote:

> On Sun, 2005-11-06 at 16:48 +0100, federico wrote:
> > it happens randomly, while I play a soft synth, that jack XRUNs once,
> > and the audio become crappy, noisy, like a kinda of digital
> > effect....bit crusher?
>
> It's probably a driver bug but could also be a PCI latency issue.
>
> Try setpci -d CARD:ID latency_timer=40 where CARD:ID is the PCI id of
> the card obtained from lspci.  Do this immediately after loading the
> driver and before playing any audio.

No, the latency must be 192 and the driver already sets it at startup.


--
Giuliano.


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