Problem with Anchor Alarm in Ubuntu 11.04

[cagney]

Originally Posted by idpnd

Thanks Iboc - sadly doesnt work on this ubuntu machine, crashes sound..

Idpnd
I have entered this bug in the tracker.FS#607 : Linux hangs on Anchor Alarm.

Thomas

[Piloto Corsario]

I have Ubuntu 11.04 32 bits an the last version of Opencpn and the provisional solution works.

Thanks

[vince7887]

anything new for this problem ? because it's very important, I will go a very long boat trip in tree weeks, and this fonction would be very helpfull !!!

It seem not so complicated... please help

Vince

[lurno]

Try: aoss opencpn
on the commandline

Rgds
Lasse

[bdbcat]

Folks....

Finally looked at this sound issue on Ubuntu 11.04.

As cagney reports, wxWidgets defaults to OSS for sound backend.

However, as generally installed from the repos, wxWidgets will fall back to SDL for the backend if OSS cannot be initialized.

I installed libsdl, and it works fine on 11.04.

Anyone else tried this with repo wxWidgets? With locally compiled wxWidgets?

Dave

[cagney]

Dave
Exactly which "libdsl" did you install?
I have

libsdl1.2debian
libsdl1.2debian-pulseaudio
libsdl-mixer1.2

installed. No difference, same result.
Using KUbuntu 11.10.
Thomas

[bdbcat]

Thomas...

Lets try this:

Replace the following method code in options.cpp

void options::OnButtonTestSound(wxCommandEvent& event)
{
#if wxUSE_LIBSDL
 printf("wxUSE_LIBSDL true\n");
#endif

      wxSound AIS_Sound(g_sAIS_Alert_Sound_File);

      if(AIS_Sound.IsOk())
      {
            printf("playing sound\n");
            AIS_Sound.Play();
      }
      else
            printf("sound is NOT ok\n");
            

}

Run OCPN from the console, and try Toolbox->AIS->Test Alert Sound. Don't forget to select a sound file first....
You should see something on the console relating to sound

Dave

[bdbcat]

Thomas....

I have, on Ubuntu 11.04,

libsdl1.2debian
libsdl1.2debian-alsa

Dave

[cagney]

Dave

The only feedback I get is "playing sound", without any sound played, so wxUSE_LIBSDL is not set.
Maybe we can draw the conclusion that sound works directly with alsa, but not if redirected via pulseaudio?

Thomas

[bdbcat]

Thomas....

wxUSE_LIBSDL is an optional constant defined at build-time in the wxWidgets libraries.

The wx libs I use (32 bits) come straight from the Ubuntu repo, and have been (fortunately) built with wxUSE_LIBSDL set true.

Did you build your wxWidgets libraries locally? If so, please check the lib/wx/setup.h file in your wx build directory. It should have this in it:

/*
 * Use SDL for audio (Unix)
 */
#define wxUSE_LIBSDL 1

/*
 * Compile sound backends as plugins
 */
#define wxUSE_PLUGINS 0

Bottom line: If wxUSE_LIBSDL is not defined, then libsdl won't be used by the runtime, and no sound will come out.

Not sure how pulseaudio relates, though....

Dave

[cagney]

Dave
I'm using plain vanilla ubuntu packages.
I tried out the eepc 386 box with Ubuntu 10.10. No sdl packages installed, so I installed the same packages as you did. No luck. Tried recompilation, still no luck, wxUSE_LIBSDL is still not set.
I wonder what's going on?
Could you make a package based on your new setup, for testing?
Thomas

[bdbcat]

Thomas....

I am having bandwidth problems this week, so cannot upload a package....sorry....

Some thoughts:

When OCPN is built, it includes "setup.h" from /usr/lib/wx/include/{build_name}/wx.
This is the setup file that establishes wxUSE_LIBSDL for the entire application.
So, check the include path in the OCPN make step by making OCPN with

$make VERBOSE=true

to find out exactly which setup.h is being included. Then look at that setup.h to validate wxUSE_LIBSDL is set.

Can you recompile the wxWidgets libraries from source? I have found that finding the exact copy of setup.h to modify before the build takes some trial and error. There are several copies of setup.h in the wxWidgets build tree.
But eventually it can be set.

More later
Dave

[cagney]

Dave

There are two setup.h .
/usr/lib/wx/include/gtk2-unicode-release-2.8/wx/setup.h from the package libwxgtk2.8-dev
and
/usr/lib/wx/include/base-unicode-release-2.8/wx/setup.h from the package libwxbase2.8-dev
Both has the line

#define wxUSE_LIBSDL 0

Both the 64 bits (11.10) and 32 bits (10.10) installations has the same setup.

So the two packages were compiled without support for libsdl.
Changing the definition in the two files setts the constant in OCPN, but, as expected (not compiled into the wx packages), still no sound.
Of course I can try to compile the two packages with wxUSE_LIBSDL set, but that doesn't solve he general problem.
I wonder how your standard ubuntu packages are compiled with sdl support while the ones I have installed lacks this support?

Thomas

[bdbcat]

Thomas....

Hmmm.....

As I recall my workflow.....
I installed Kubuntu 11.04 (32) from ISO. There was no sign of wxWidgets in the default repos.

So I added wxWidgets repos to synaptics "Other Software" sources viz.

	
	

			
				http://apt.wxwidgets.org/
			
		
 natty-wx main

	
	

			
				http://apt.wxwidgets.org/
			
		
 natty-wx main (Source Code)

And then installed libwxgtk2.8-dev.

And there it was. wxUSE_LIBSDL was set in these binaries.

Now, after the fact, I wonder why there was no wx in the natty canonical repos?

What do you find for your 11.10? Were wxWidgets runtime and dev packages in the as-shipped apt sources list?

I love mysteries....
Dave

[cagney]

Dave

The only thing I did, that was different from the default config, was to activate "universe" in the source list.

I'm happy you did not find the wx packages in the standard place, because the repro you found, leads to a very simple solution to the problem.
Just replace the installed libwxgtk2.8-0 package, with a package from apt.wxwidgets.org.
No recompilation, just a different deb package.
There is no specific package for 11.10, but the package for 11.04 worked just fine as a straight forward replacement for me.
I have tested this on two computers, 32&64 bits.
It would be nice if more users could test this. If it works we just have to tweak the Linux installation instructions a little bit.

To add this repo to the source list, these instructions should work for OpenCPN as well -->InstallingOnUbuntuOrDebian - wxPyWiki
I have not had the time to test this.

Thanks for the solution!

Thomas