hi all,
i faced similar problem before, and i work around by forcing the player to play
fixed sample rate. or to convert the media file to certain sample rate. by
expermind i found that you can play 44100, 48000, 32000 for any period of time
without any sound drop, try this and kindly inform me if still you have the
problem.
--------------------------------------
Mohamed AbdElwahed Ibrahim
> From: santosh_si...@mindtree.com
> To: sc...@mvista.com
> Date: Mon, 15 Jun 2009 09:45:26 +0530
> CC: davinci-linux-open-source@linux.davincidsp.com
> Subject: RE: Need help for missing sound after some time in /dev/dsp
>
>
>
> -----Original Message-----
> From: Steve Chen [mailto:sc...@mvista.com]
> Sent: Thursday, June 11, 2009 10:21 PM
> To: Santosh Singh
> Cc: davinci-linux-open-source@linux.davincidsp.com
> Subject: RE: Need help for missing sound after some time in /dev/dsp
>
> On Thu, 2009-06-11 at 18:32 +0530, Santosh Singh wrote:
> > -----Original Message-----
> > From: Steve Chen [mailto:sc...@mvista.com]
> > Sent: Thursday, June 11, 2009 5:57 PM
> > To: Santosh Singh
> > Cc: davinci-linux-open-source@linux.davincidsp.com
> > Subject: Re: Need help for missing sound after some time in /dev/dsp
> >
> > On Thu, 2009-06-11 at 14:17 +0530, Santosh Singh wrote:
> > > Hi All,
> > >
> > > We are writing small application on TI's DM6446 evaluation board.
> > >
> > > I am facing sound related problem i.e., with /dev/dsp.
> > >
> > > When we are playing some .wav file using na_play ,I could hear the sound
> > > for a longer period without any problem.
> > >
> > >
> > >
> > > But from a C routine when we are executing a shell script using system
> > > call() to play a .wav file continuously for a period of time in a for
> > > loop.
> > >
> > > After some time around 2-5 min sound goes off, but shell script is still
> > > being called by c routine and even after reboot sound doesn't come up.
> > >
> > > Finally we have to do a hard reset to reboot the system to correct this
> > > sound problem.
> > >
> > >
> > >
> > > I don't find any error messages in dmesg.
> > >
> > > Even command fuser -v /dev/dsp shows only my application name.
> > >
> > > Sample code:
> > >
> > > C routine:
> > >
> > >
> > >
> > > for (int i=0; i< 1000; i++ )
> > >
> > > system ("./na_play tem.wav");
> > >
> > > na_play is the player in current directory and
> > >
> > > tem.wav is the .wav file to play.
> > >
> > > Please help to find out actual problem and solution if possible.
> > >
> > >
> > > Regards,
> > >
> > > Santosh
> > >
> >
> > A few qustions
> >
> > 1. Which kernel are you using.
> > 2. Can you reproduce the problem playing a long sound file?
> >
> > I recall reading a bug report sometime ago that start/stop audio
> > repeatedly can cause audio to stop working which is what you are doing.
> >
> > Regards,
> > Steve
> >
> >
> > Hi Steve,
> > Thanks for your response.
> > 1. Kernel version is 2.6.10 montavista-linux
> > 2. We are not able to reproduce the problem with long file, only with short
> > file when playing one after the other. i.e. when I try to run a sample file
> > as mentioned in my previous mail in a loop I find that the sound goes off
> > after few minutes.
> > When I do a soft reboot with "reboot" command and try to play any .wav file
> > I don't get any sound. I need to do hard reboot to fix this issue.
>
> I'm not too familiar with 2.6.10 sound as it has the old OSS instead of
> ALSA found in later kernels. You may want to consider using a later
> kernel - either TI LSP2.0/MVL Pro 5.0 or the DaVinci GIT tree.
>
> If for some reasons, you are unable to move to newer kernel. Make sure
> you have all the latest updates. There was a substantial rewrite of
> DaVinci OSS driver during LSP 1.3 where a bunch of issues were fixed.
>
> Regards,
>
> Steve
>
>
> Hi Steve,
> Thanks for your response.
> As you suggested to use the latest kernel rather than using 2.6.10 for
> /dev/dsp sound missing problem when I do multiple time start and stop sound.
>
> Can I get some other solution may be some patch available for /dev/dsp kernel
> 2.6.10 or some modification in sound code so that I can build kernel here to
> fix the above issue?
>
> Thanks in advance.
>
> Regards,
> Santosh
>
>
>
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