nsound does not work with swig3, ubuntu 16

[weegreenblobbie]

I'm having all kinds of problems on ubuntu 16 out of the box:

Ubuntu 16 default swig package is 3.X, which doesn't seem to work with nsound 0.9.4. After building and installing the python package with swig3, I get strange errors, as simple trying to construct a Sine generator:

import Nsound as ns
g = ns.Sine(44100)
#...
AttributeError: type object 'object' has no attribute '__getattr__'

Nsound partially works after installing the swig2.0 package:

sudo apt-get install swig2.0

Running unit tests from the git clone works as expeted:

python -m unittest discover
.....................................
----------------------------------------------------------------------
Ran 37 tests in 2.971s

OK

However trying to run one of the examples hangs in what appears to be an infinite loop:

cd src/examples
python example1.py
# no output, just hangs

Please fix for Ubuntu 16!

[ghost]

Hello, wegreenblobbie.

I'm having the same issue in Fedora 24. Is there any solution at this moment besides downgrading swig?
Cheers

[weegreenblobbie]

I haven't looked into this, I could take a look this weekend.

[ghost]

That would be awesome!

[weegreenblobbie]

Partial success. It turns out that swig 3.08 (the packaged version in ubuntu 16.04) is buggy.

I manually installed swig 3.0.12, some things are working, unit tests are passing (I don't have much coverage), but some of the examples still hang.

[ghost]

I searched similar errors online and swig does seem buggy. I think this is useful:
swig/swig#553

[weegreenblobbie]

Yeah, I saw that too, but the -modern doesn't seem to have any impact with swig 3.0.12.

[weegreenblobbie]

098411d

[weegreenblobbie]

work in progress ...

[weegreenblobbie]

@respinha try out the branch "bugfix/issue5", you will need swig 3.0.12, let me know if it works for you.

My long term plan is to completely rewrite Nsound in c++14, the existing code base is very old and difficult to maintain. SWIG is also very painful, I may look into alternatives like cython, boost::python, or pybind11.

:)

[ghost]

@weegreenblobbie I removed the previously generated python files with a 'pip uninstall' and then tried the new branch and still doesn't work when I create a Sine.

PS: indeed, swig seems troublesome.

[weegreenblobbie]

How did you install? You can check what version is installed by looking at Nsound.__version__. Make sure it reports 0.9.5.dev1.

You can also try to see if the unittests run with: scons --pytest

[ghost]

I installed as you suggest in the INSTALL file, running scons and then sudo python setup.py install.
I also tried running unittests and they all fail with the same error.

PS: yes, my version is 0.9.5.dev1

[weegreenblobbie]

Perhaps there is another issue, can you paste in the error. I'll try to run Fedora 24 in a VM to see if I can duplicate the error you're seeing.

[ghost]

@weegreenblobbie it's the same error in all tests. Whenever an object of any type is created, it always crashes with this stacktrace:

File ".local/lib/python2.7/site-packages/Nsound-0.9.5.dev1-py2.7-linux-x86_64.egg/Nsound.py", line 7522, in __init__
    self.this.append(this)
  File ".local/lib/python2.7/site-packages/Nsound-0.9.5.dev1-py2.7-linux-x86_64.egg/Nsound.py", line 7515, in <lambda>
    __getattr__ = lambda self, name: _swig_getattr(self, Sine, name)
  File ".local/lib/python2.7/site-packages/Nsound-0.9.5.dev1-py2.7-linux-x86_64.egg/Nsound.py", line 74, in _swig_getattr
    return _swig_getattr_nondynamic(self, class_type, name, 0)
  File ".local/lib/python2.7/site-packages/Nsound-0.9.5.dev1-py2.7-linux-x86_64.egg/Nsound.py", line 69, in _swig_getattr_nondynamic
    return object.__getattr__(self, name)

[weegreenblobbie]

What does swig -version report?

[ghost]

3.0.8

[weegreenblobbie]

3.0.8 is buggy, can you install the latest? 3.012?

[ghost]

Updated swig, removed all instances of Nsound and installed 0.9.5.dev1 and it still doesn't work.

[weegreenblobbie]

Same error? I guess I'll just have to get fedora 24 and see what's up. Thanks for the testing.

[ghost]

I really doubt that it's something to do with Fedora but you can always check it out! I am planning to get started on the 'audio programming' world and Nsound really seems an interesting solution.

[weegreenblobbie]

@respinha I just built nsound in a docker container using fedora:24, unittests ran fine. I suspect that swig 3.0.8 is somehow still getting used during the build. Here's my Dockerfile:

FROM fedora:24


RUN \
    dnf install  -vy     \
        gcc-c++.x86_64 \
        make.x86_64 \
        pcre-devel.x86_64 \
        python-devel.x86_64 \
        python.x86_64 \
        python2-matplotlib-tk.x86_64 \
        python2-numpy.x86_64 \
        redhat-rpm-config.noarch \
        scons.noarch \
        tar.x86_64 \
        unzip.x86_64 \
        wget.x86_64


RUN \
    cd /tmp/                                                              && \
    export SWIG_URL='https://downloads.sourceforge.net/project/swig/swig/swig-3.0.12/swig-3.0.12.tar.gz?r=https%3A%2F%2Fsourceforge.net%2Fprojects%2Fswig%2Ffiles%2Fswig%2Fswig-3.0.12%2Fswig-3.0.12.tar.gz%2Fdownload%3Fuse_mirror%3Dsuperb-sea2&ts=1487115624&use_mirror=svwh' && \
    wget -O swig-3.0.12.tar.gz "$SWIG_URL"                                && \
    tar xf swig*                                                          && \
    cd swig*                                                              && \
    ./configure --prefix=/usr                                             && \
    make -j 4                                                             && \
    make install


RUN \
    cd /tmp/                                                              && \
    wget https://github.com/weegreenblobbie/nsound/archive/bugfix/issue5.zip && \
    unzip issue5.zip                                                      && \
    ls -lh                                                                && \
    cd nsound*                                                            && \
    scons --pytest

Here's the output:

# ...
creating dist
creating 'dist/Nsound-0.9.5.dev1-py2.7-linux-x86_64.egg' and adding 'build/bdist.linux-x86_64/egg' to it
removing 'build/bdist.linux-x86_64/egg' (and everything under it)
Processing Nsound-0.9.5.dev1-py2.7-linux-x86_64.egg
creating /root/.local/lib/python2.7/site-packages/Nsound-0.9.5.dev1-py2.7-linux-x86_64.egg
Extracting Nsound-0.9.5.dev1-py2.7-linux-x86_64.egg to /root/.local/lib/python2.7/site-packages
Adding Nsound 0.9.5.dev1 to easy-install.pth file

Installed /root/.local/lib/python2.7/site-packages/Nsound-0.9.5.dev1-py2.7-linux-x86_64.egg
Processing dependencies for Nsound==0.9.5.dev1
Finished processing dependencies for Nsound==0.9.5.dev1
.........sss.........................
----------------------------------------------------------------------
Ran 37 tests in 0.591s

OK (skipped=3)

[ghost]

It seems like I hadn't totally removed swig 3.0.8. It is now working!

[weegreenblobbie]

Who hoo! 😎

[weegreenblobbie]

I've published 0.9.5 to pypi: https://pypi.org/project/Nsound/0.9.5/