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Date:      Fri, 20 Jun 2003 21:35:24 -0400
From:      Lucas Wilcox <lucasw@dam.brown.edu>
To:        Ken Marx <kmarx@vicor.com>
Cc:        Lucas Wilcox <lucasw@dam.brown.edu>
Subject:   Re: Problems playing certain wav files
Message-ID:  <20030621013524.GA28965@r2d2.fdu.edu>
In-Reply-To: <3EF238CC.9080300@vicor.com>
References:  <20030612014649.GA1525@r2d2.fdu.edu> <3EEA1948.7000100@vicor.com> <20030613191012.GA14158@r2d2.mh.lucent.com> <3EEA2FDE.1080508@vicor.com> <20030614143801.GB4882@r2d2.ri.cox.net> <20030614140515.694acb34.rpratt1950@earthlink.net> <20030614205151.GA6045@r2d2.ri.cox.net> <3EEE2C05.3000506@vicor.com> <20030616205718.GA1972@r2d2.mh.lucent.com> <3EF238CC.9080300@vicor.com>

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On Thu, Jun 19, 2003 at 03:27:24PM -0700, Ken Marx wrote:
> Hi Lucas,
> 
> Sorry for the delay getting back to you. My friend, Julian,
> just brought his laptop in today.
No problem.

> 
> Sorry for this, but we have a new dimension in behavior space:
> 
> On his 5.0 box neither your beep nor my converted beep file
> plays. Not only this, but waveplay doesn't even exit!
> Running under truss, we see it hang on a call to exit().
I do not see this on 4.8, wavplay just exits quickly.
> 
> Longer files do play fine. So it appears that for small
> files the device never flushes. Didn't do any checking
> to see what this hypothesized data limit might be.
I see this similar behavior on 4.8.  In general the small files are the
ones that do not play.  I too a small file that would not play
%wavplay KDE_Beep_Beep.wav       
 Pathname:       KDE_Beep_Beep.wav
 Device:         /dev/audio
 Sampling Rate:  7418 Hz
 Mode:           Mono
 Samples:        1034
 Bits:           8

Then I added about 3 seconds of silence using sweep and the following
file did play with sox play and wavplay
%wavplay KDE_Beep_Beep2.wav 
Pathname:       KDE_Beep_Beep2.wav
Device:         /dev/audio
Sampling Rate:  7418 Hz
Mode:           Mono
Samples:        23046
Bits:           8

So it looks to me like a size problem too.  I am thinking about looking
at the driver and seeing what is going on.  I have no experience with
drivers but wrote a little c in school we will see how far it goes.

Lucas



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