More work on sound support. pythonarcade#184.

Loading avbin again. Can now play ogg, mp3, and wav on windows.

arcade/sound.py

@@ -9,6 +9,58 @@
 import pyglet
 
 
+def _load_sound_library():
+    """
+    Special code for Windows so we grab the proper avbin from our directory.
+    Otherwise hope the correct package is installed.
+    """
+
+    # lazy loading
+    if not _load_sound_library._sound_library_loaded:
+        _load_sound_library._sound_library_loaded = True
+    else:
+        return
+
+    import os
+    appveyor = not os.environ.get('APPVEYOR') is None
+
+    import platform
+    system = platform.system()
+    if system == 'Windows':
+
+        import sys
+        is64bit = sys.maxsize > 2**32
+
+        import site
+        packages = site.getsitepackages()
+
+        if appveyor:
+            if is64bit:
+                path = "Win64/avbin"
+            else:
+                path = "Win32/avbin"
+
+        else:
+            if is64bit:
+                path = packages[0] + "/lib/site-packages/arcade/Win64/avbin"
+            else:
+                path = packages[0] + "/lib/site-packages/arcade/Win32/avbin"
+    elif system == 'Darwin':
+        from distutils.sysconfig import get_python_lib
+        path = get_python_lib() + '/lib/site-packages/arcade/lib/libavbin.10.dylib'
+        pyglet.options['audio'] = ('openal', 'pulse', 'silent')
+
+    else:
+        path = "avbin"
+        pyglet.options['audio'] = ('openal', 'pulse', 'silent')
+
+    pyglet.lib.load_library(path)
+    pyglet.have_avbin = True
+
+# Initialize static function variable
+_load_sound_library._sound_library_loaded = False
+
+
 def _shellquote(s):
     return "'" + s.replace("'", "'\\''") + "'"
 
@@ -57,6 +109,7 @@ def _load_sound_other(filename: str) -> typing.Any:
 system = system()
 
 if system == 'Windows':
+    _load_sound_library()
     play_sound = _play_sound_win
     load_sound = _load_sound_win
 elif system == 'Darwin':