[linux-audio-user] JACK samplerate stuck at 48000

Cesare Marilungo cesare at poeticstudios.com
Tue Jun 20 22:35:56 EDT 2006


Lee Revell wrote:

>On Wed, 2006-06-21 at 02:02 +0000, Cesare Marilungo wrote:
>  
>
>>Lee Revell wrote:
>>
>>    
>>
>>>On Tue, 2006-06-20 at 10:24 -0700, Mark Knecht wrote:
>>> 
>>>
>>>      
>>>
>>>>Many built-in/inexpensive sound cards are stuck at 48K. Possibly this
>>>>one is also?
>>>>
>>>>   
>>>>
>>>>        
>>>>
>>>It's still a bug for JACK not to report any error.
>>>
>>>Does aplay report any errors with a 44100Hz file?
>>>
>>> 
>>>
>>>      
>>>
>>In fact it happens on my laptop (it has a VIA AC97 chip). Jack does 
>>report the sample rate you choose but the other applications connect to 
>>it at 48000Hz.
>>
>>I guess it is because they're designed to play dvds (which are at 
>>48000Hz) and they don't have a built-in sample rate converter. Maybe 
>>JACK assumes they always have one since it is designed for high end cards?
>>
>>    
>>
>
>I think cards defaulted to 48000Hz before DVDs existed.  I believe the
>AC97 spec requires it and it's cheapest to support a single sample rate
>and rely on a software sample rate converter for everything else.
>
>Lee
>  
>
Not all. On my desktop pc (which has a VIA 8237, an AC97 based card - 
the mb is a ASUS K8V-X) jack lets me choose both sample rates.

c.

>  
>
>>>>- Mark
>>>>
>>>>On 6/20/06, Link Swanson <link at sumerianbabyl.com> wrote:
>>>>   
>>>>
>>>>        
>>>>
>>>>>After removing my Multiface II and switching back to my nVidia onboard
>>>>>audio, qjackctl will not run at 44100. I can set it in the setup window
>>>>>and it reports starting 44100 in the messages:
>>>>>
>>>>>11:07:46.232 Patchbay deactivated.
>>>>>11:07:46.322 Statistics reset.
>>>>>11:07:46.498 MIDI connection graph change.
>>>>>11:07:46.528 MIDI connection change.
>>>>>11:07:47.580 Startup script...
>>>>>11:07:47.580 artsshell -q terminate
>>>>>11:07:47.861 Startup script terminated with exit status=256.
>>>>>11:07:47.861 JACK is starting...
>>>>>11:07:47.862 jackd -R -dalsa -dhw:1,0 -r44100 -p512 -n2 -S
>>>>>11:07:47.870 JACK was started with PID=3071 (0xbff).
>>>>>jackd 0.101.0
>>>>>Copyright 2001-2005 Paul Davis and others.
>>>>>jackd comes with ABSOLUTELY NO WARRANTY
>>>>>This is free software, and you are welcome to redistribute it
>>>>>under certain conditions; see the file COPYING for details
>>>>>JACK compiled with System V SHM support.
>>>>>loading driver ..
>>>>>Enhanced3DNow! detected
>>>>>SSE2 detected
>>>>>apparent rate = 44100
>>>>>creating alsa driver ... hw:1,0|hw:1,0|512|2|44100|0|0|nomon|swmeter|-|16bit
>>>>>control device hw:1
>>>>>configuring for 44100Hz, period = 512 frames, buffer = 2 periods
>>>>>nperiods = 2 for capture
>>>>>nperiods = 2 for playback
>>>>>11:07:49.953 Server configuration saved to "/home/bozone/.jackdrc".
>>>>>11:07:49.954 Statistics reset.
>>>>>11:07:49.979 Client activated.
>>>>>11:07:49.980 Audio connection change.
>>>>>11:07:49.981 Audio connection graph change.
>>>>>Enhanced3DNow! detected
>>>>>SSE2 detected
>>>>>11:10:21.095 MIDI connection graph change.
>>>>>11:10:21.123 Audio connection graph change.
>>>>>11:10:26.482 Audio connection graph change.
>>>>>11:10:26.504 MIDI connection graph change.
>>>>>
>>>>>But then both qjackctl and Ardour report 48000 as the samplerate.
>>>>>
>>>>>All help is appreciated.
>>>>>
>>>>>Link
>>>>>
>>>>>
>>>>>--
>>>>>e-mail is . . .
>>>>>
>>>>>     
>>>>>
>>>>>          
>>>>>
>>>
>>> 
>>>
>>>      
>>>
>>    
>>
>
>
>
>  
>


-- 
www.cesaremarilungo.com




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