Hello,

If I use AudioTrack for an Android app (that is, instantiating with
CsoundObj(true)), 9 out of 10 times the app would freeze when trying to stop
using CsoundObj.stop(). After some debugging I found the source of the
problem in CsoundObj.java.

The main execution while loop inside runCsoundAudioTrack(File f) contains a
synchronized block of code that causes the freeze if the variable "stopped"
changes to "true" after the while loop has already started. I'm not expert
in threading but to my logic it seems that when CsdoundObj.stop() is called,
setting stopped to "true" and waiting at thread.join(), trying to
synchronize locks everything. By moving this synchronized code to the top of
the while loop, solves the problem.

In other words, in runCsoundAudioTrack(File f), instead of:



It should be:



Now, I'm not sure if inverting those two blocks of code would cause
something to malfunction (writing the samples out to audioTrack after
updating the values to and from Csound), but at least it seems to work fine
for me.

Best,

Hector




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why are you using AudioTrack()? The OpenSL IO will give you better performance. We never really
tested the AudioTrack code too much at all, and have not used it in production.
On 30 Jan 2014, at 19:47, hcenteno  wrote:

> Hello,
> 
> If I use AudioTrack for an Android app (that is, instantiating with
> CsoundObj(true)), 9 out of 10 times the app would freeze when trying to stop
> using CsoundObj.stop(). After some debugging I found the source of the
> problem in CsoundObj.java.
> 
> The main execution while loop inside runCsoundAudioTrack(File f) contains a
> synchronized block of code that causes the freeze if the variable "stopped"
> changes to "true" after the while loop has already started. I'm not expert
> in threading but to my logic it seems that when CsdoundObj.stop() is called,
> setting stopped to "true" and waiting at thread.join(), trying to
> synchronize locks everything. By moving this synchronized code to the top of
> the while loop, solves the problem.
> 
> In other words, in runCsoundAudioTrack(File f), instead of:
> 
> 
> 
> It should be:
> 
> 
> 
> Now, I'm not sure if inverting those two blocks of code would cause
> something to malfunction (writing the samples out to audioTrack after
> updating the values to and from Csound), but at least it seems to work fine
> for me.
> 
> Best,
> 
> Hector
> 
> 
> 
> 
> --
> View this message in context: http://csound.1045644.n5.nabble.com/Android-runCsoundAudioTrack-app-freeze-and-possible-solution-tp5732081.html
> Sent from the Csound - Dev mailing list archive at Nabble.com.
> 
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> Csound-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/csound-devel


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I made an app that is failing to output any sound in someone else's specific
device (Italian NGM Forward Prime running Android 4.2). I don't have access
to the device to check the logs (and the user can't handle doing it) so I
was wondering if running Csound using AudioTrack instead of OpenSL could be
the solution.

Does this make sense?

Thanks!

Hector




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OpenSL is present in 4.2, and I would not think that could be the case. Did you try the Csound examples or the Csound app to see if it works?
The new Csound app has  a console, which makes it handy to see if there are issues.

On 30 Jan 2014, at 21:32, hcenteno  wrote:

> I made an app that is failing to output any sound in someone else's specific
> device (Italian NGM Forward Prime running Android 4.2). I don't have access
> to the device to check the logs (and the user can't handle doing it) so I
> was wondering if running Csound using AudioTrack instead of OpenSL could be
> the solution.
> 
> Does this make sense?
> 
> Thanks!
> 
> Hector
> 
> 
> 
> 
> --
> View this message in context: http://csound.1045644.n5.nabble.com/Android-runCsoundAudioTrack-app-freeze-and-possible-solution-tp5732081p5732086.html
> Sent from the Csound - Dev mailing list archive at Nabble.com.
> 
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I didn't know that the AudioTrack mode wasn't tested and ready for use and
thought I could help by posting a solution to a problem I found.

I'm wondering now, what is then the purpose of the AudioTrack mode in
CsoundObj? Only to be used when a device doesn't have OpenSL (versions below
Android 2.3)?

Best,

Hector



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The code is there because it was the first thing we did, before we worked out how to use OpenSL. Since then we
have not used it. I guess an obvious use is what you said, but this will be increasingly less relevant as time passes
on. So, by all means, if you need to use it, do, and send any bugs via tickets on sourceforge (if there are patches or
suggested fixes, that is also great).

Regards

Victor
On 31 Jan 2014, at 16:50, hcenteno  wrote:

> I didn't know that the AudioTrack mode wasn't tested and ready for use and
> thought I could help by posting a solution to a problem I found.
> 
> I'm wondering now, what is then the purpose of the AudioTrack mode in
> CsoundObj? Only to be used when a device doesn't have OpenSL (versions below
> Android 2.3)?
> 
> Best,
> 
> Hector
> 
> 
> 
> --
> View this message in context: http://csound.1045644.n5.nabble.com/Android-runCsoundAudioTrack-app-freeze-and-possible-solution-tp5732081p5732095.html
> Sent from the Csound - Dev mailing list archive at Nabble.com.
> 
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