Audio dependency names for CentOS 7 about engine

[leonsal]

1. We will change the reference of libopenal1 to openal-soft for CentOS in the README.

2. Does CentOS has the libvorbisfile3 package ?
   In Debian/Ubuntu this package depends on libvorbis and libogg,
   so installing it also installs libvorbis and libogg.
   This package is need by G3N as it contains high-level functions for reading OggVorbis encoded audio files.

3. The development packages are not needed for any of these libraries since
   the header files are included internally in G3N.

[justinclift]

Checking now, CentOS 7 doesn't seem to have libvorbisfile3 package available in the standard repositories:

$ sudo yum list|grep -i vorbis
libvorbis.i686                          1:1.3.3-8.el7                  @base    
libvorbis.x86_64                        1:1.3.3-8.el7                  @anaconda
libvorbis-devel.i686                    1:1.3.3-8.el7                  base     
libvorbis-devel.x86_64                  1:1.3.3-8.el7                  base     
libvorbis-devel-docs.noarch             1:1.3.3-8.el7                  base     
mingw32-libvorbis.noarch                1.3.4-1.el7                    epel     
mingw64-libvorbis.noarch                1.3.4-1.el7                    epel     
vorbis-tools.x86_64                     1:1.4.0-12.el7                 base

Doing some searching online about it to gain a better understanding... all that's really showing up is the Debian and Ubuntu package pages for it:

• https://packages.debian.org/stretch/libvorbisfile3
• https://launchpad.net/ubuntu/+source/libvorbis

Taking another approach, the standard libvorbis package in CentOS 7 (and Fedora too it seems) already contains a libvorbisfile library:

$ rpm -ql libvorbis|grep -i file|sort
/usr/lib64/libvorbisfile.so.3
/usr/lib64/libvorbisfile.so.3.3.5
/usr/lib/libvorbisfile.so.3
/usr/lib/libvorbisfile.so.3.3.5

I'm kind of guessing... but it seems like the libvorbis package on CentOS/Fedora might already have the needed bits. Might not be a seperate package needed.

That being said... I have no idea why .ogg files aren't playing through g3nplay, but .wav files are.

[leonsal]

Does ldconfig find libvorbisfile ?
In my Linux Mint the command returns:

>ldconfig -p | grep libvorbisfile
	libvorbisfile.so.3 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libvorbisfile.so.3

[justinclift]

Yep:

$ ldconfig -p|grep -i libvorbisfile
        libvorbisfile.so.3 (libc6,x86-64) => /lib64/libvorbisfile.so.3
        libvorbisfile.so.3 (libc6) => /lib/libvorbisfile.so.3

Note that I have both 32 and 64-bit versions installed, as the desktop itself is 64-bit but I have Steam also installed. Steam is 32-bit only, so pulled in a bunch of 32-bit versions of things when installing.

Just to check if it makes any difference, I removed the 32-bit version of libvorbis, compiled g3nplay again and tried out the .ogg files. Still no go:

$ go build main.go
$ ./main Vivaldi1.wav 
OpenAL Community version: 1.1 ALSOFT 1.16.0
Xiph.Org libVorbis 1.3.3
Playing:[Vivaldi1.wav] (62.0 seconds)
^C
$ ./main Bach1.ogg 
OpenAL Community version: 1.1 ALSOFT 1.16.0
Xiph.Org libVorbis 1.3.3
^C

Hmmm, looking at the output from those two runs, it clearly could process the .wav file as it shows the name and expected runtime. Not so for the .ogg.

I can try attaching a debugger to it later on today and see if anything interesting shows up as a difference. Hopefully it's something simple. 😄

[justinclift]

Oh, as a data point, the g3nd demo program also hangs when playing any of the audio demos. The visual-only ones work completely fine however.

Completely guessing here, but it's probably going to be the same root cause, whatever that turns out to be. 😄

[leonsal]

We committed a new version of G3N and G3ND. Now the installation of the audio libraries dependencies is compulsory. We updated the README.md with these dependencies.
What was probably happening previously was that we were compiling G3N with internal libogg/libvorbis headers for an specific version (1.3.2/1.3.5) but the user's installed version was different.
I noticed that in CentOS 7 the libvorbis version is 1.3.3 but in Ubuntu/Mint is 1.3.5. This probably crashed the program when a function of the library was called.

[justinclift]

Thanks @leonsal. I'll recompile and see if the audio now plays. If it does, that'll pretty much confirm that was the problem. 😄

[justinclift]

Excellent news, the audio now works!

Btw, the required devel packages for building on CentOS 7 seem to be libvorbis-devel and openal-soft-devel. No need to specifically request libogg-devel, as the libvorbis-devel package pulls it in automatically as a dependency.

Note - tried with and without each of them just to make sure. Those two above are definitely the correct ones. 😄

Thanks for getting this done!

[justinclift]

Ahhhh, just noticed you've already updated the README.md with that info. Cool. 😄