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

[Aggarwal, Anuj]

> -----Original Message-----
> From: Peter Ujfalusi [mailto:peter.ujfalusi at nokia.com]
> Sent: Thursday, May 07, 2009 4:38 PM
> To: alsa-devel at alsa-project.org
> Cc: todd.fischer at ridgerun.com; Aggarwal, Anuj; linux-omap at vger.kernel.org
> Subject: Re: [alsa-devel] Beep sound in the end of audio file
> 
> On Thursday 07 May 2009 08:48:25 Ujfalusi Peter (Nokia-D/Tampere) wrote:
> > On Wednesday 06 May 2009 17:19:49 ext Todd Fischer wrote:
> > > 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
> >
> > The "tuck" is coming from the codec, when it is powered down (in the old
> > twl4030 codec found in omap-2.6.28 branch of linux-omap).
> > But, it still happens with the latest version, when the codec is muted
> > only. I can observe the "tuck" on Headset output, but not on the
> > PreDrive... The Headset enable and disable is implemented according to the
> > TRM, but it seams that additional tweaking is needed..
> 
> I need to revisit this...
> After more testing and debugging, it seams that I can not confirm the
> existence of the "tuck" (with the latest twl4030  codec code).
> As soon as I receive my Beagle board I will test it again (can anyone test
> this with latest ASoC code on Beagle?)...
> 
> [Anuj]: What kernel are you using where you have the beep?
[Aggarwal, Anuj] 2.6.29-rc3
> 
> --
> Péter