[alsa-devel] Beep sound in the end of audio file

[Todd Fischer]

Hi,

FWIW: while developing a GSTreamer presentation using a BegleBoard (rev
C), I noticed the same "tuck" sound.  It also occurs a second or two
after the GST application exits.  I assumed it was some power management
code that was disabling the audio codec after it had gone idle, but
never looked into it.  BeagleBoard also uses TWL4030.

GST command: gst-launch audiotestsrc freq=1000 num-buffers=100 !
alsasink

/proc/version: Linux version 2.6.28-omap1 (ddompe at Aleph) (gcc version
4.3.1 (GCC) ) #2 Thu Mar 5 08:55:58 CST 2009

Code image: http://www.beagleboard.org/~arago/esc/esc2009sj.v12.img.gz

Todd

On Wed, 2009-05-06 at 19:30 +0530, Aggarwal, Anuj wrote:

> > -----Original Message-----
> > From: Peter Ujfalusi [mailto:peter.ujfalusi at nokia.com]
> > Sent: Wednesday, May 06, 2009 11:03 AM
> > To: Aggarwal, Anuj
> > Cc: linux-omap at vger.kernel.org; alsa-devel at alsa-project.org
> > Subject: Re: Beep sound in the end of audio file
> > 
> > Hello,
> > 
> > On Tuesday 05 May 2009 20:03:57 ext Aggarwal, Anuj wrote:
> > > Hi,
> > >
> > > After playing out any audio file on OMAP3 EVM, having TWL4030 codec,
> > > I am hearing a beep sound. I have also tried implementing a mute function
> > > in which I disabled all the inputs/outputs but still that didn't help.
> > >
> > > Any idea how this can be avoided?
> > 
> > I have not heard from this kind of problem so far, which does not mean, that
> > it does not exist ;)
> > Can you describe the beep sound?
> [Aggarwal, Anuj] It's kind of a "tuck" sound coming in the end, after 1 or  2 seconds.
> > 
> > After a quick look I can not pin point the soc board file used with the
> > omap3evm board. Is it in the tree?
> [Aggarwal, Anuj] No, it is not. Reason being we already have beagle & 
> sdp3430 there, which are both similar to omap3evm, which I pushed. 
> So mine got rejected. We had some discussions on how to handle this
> scenario but nothing got finalized.
> > 
> > Does the beep happens in these cases also (after stopping it with Ctrl+C):
> > aplay -f dat /dev/zero
> > aplay -f dat /dev/urandom
> [Aggarwal, Anuj] Yes, it comes in both the cases.
> > 
> > 
> > CC-ing alsa-devel...
> > 
> > >
> > > Thanks and Regards,
> > > Anuj Aggarwal
> > >
> > > Platform Support Products
> > > Texas Instruments Incorporated
> > 
> > 
> > --
> > Péter
> 
> --
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