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Index › Programming Questions & Help › Sound,  Music Libraries › Minim, ubuntu and error: Unable to return...
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Minim, ubuntu and error: Unable to return... (Read 2483 times)
migueljgz
Minim, ubuntu and error: Unable to return...
May 18th, 2010, 3:24pm  
Hi to all,

new in processing, and trying to use the sound librarie Minim to play some samples.

I´m using Ubuntu 9.10(may be is related with the SO), and when I try
to run the code I get:

==== JavaSound Minim Error ====
==== Couldn't open the line: null

==== JavaSound Minim Error ====
==== Unable to return a SourceDataLine: unsupported format - PCM_SIGNED 44100.0 Hz, 16 bit, stereo, 4 bytes/frame, little-endian

I´m using one of the examples of the Processing enviroment,
"Load sample"

I cannot find any problem related, any help would be very appreciated.

Thanks.
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Gerrit
Re: Minim, ubuntu and error: Unable to return...
Reply #1 - May 19th, 2010, 2:12am  
I have almost the exact same problem under Ubuntu 10.04 Lucid Lynx. I get:

==== JavaSound Minim Error ====
==== Couldn't open the line: Audio Device Unavailable

==== JavaSound Minim Error ====
==== Unable to return a SourceDataLine: unsupported format - PCM_SIGNED 44100.0 Hz, 16 bit, stereo, 4 bytes/frame, little-endian

Using openjdk instead of sun-java6 seems to work, but I'm using the controlP5 library which doesn't work corrctly with openjdk.

From what I can make out it seems that sun-java6 uses the ALSA sound mixer instead of PulseAudio, which is what Ubuntu uses now. I hope somebody has an idea on how to fix this.
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Gerrit
Re: Minim, ubuntu and error: Unable to return...
Reply #2 - May 19th, 2010, 2:36am  
OK, I think I might have solved it. Referring to this bug:

https://bugs.launchpad.net/ubuntu/+source/sun-java6/+bug/457144

it seems that all you have to do is to copy libpulse-java.so and pulse-java.jar from openjdk to sun-java6:

Code:

sudo cp /usr/lib/jvm/java-6-openjdk/jre/lib/i386/libpulse-java.so /usr/lib/jvm/java-6-sun/jre/lib/i386/

sudo cp /usr/lib/jvm/java-6-openjdk/jre/lib/ext/pulse-java.jar /usr/lib/jvm/java-6-sun/jre/lib/ext/


The problem is that the Ubuntu guys want to support openjdk and not sun-java6 (it has even been excluded from the main repositories), so the chances of sun-java6 getting PulseAudio support are pretty slim. This fix does seem to work though!
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migueljgz
Re: Minim, ubuntu and error: Unable to return...
Reply #3 - May 22nd, 2010, 1:35pm  
Thanks Gerrit,

now pulseaudio works for sun-java-6, the fact is, when I followed the steps I was able to play samples, but I was trying to set the volume with setVolume() method, and now suddenly there is no sound at all(loading other sketches that before worked the sound output.)

Also I uninstalled alsa, to have only pulseadio as I read that there was a problem in between in Ubuntu.

Any idea?
Thanks.
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