fixes error loading unicode filenames

madmom/audio/signal.py

@@ -556,11 +556,13 @@ def load_audio_file(filename, sample_rate=None, num_channels=None, start=None,
     from .ffmpeg import load_ffmpeg_file
 
     # determine the name of the file if it is a file handle
-    if not isinstance(filename, str):
+    try:
         # close the file handle if it is open
         filename.close()
         # use the file name
         filename = filename.name
+    except AttributeError:
+        pass
     # try reading as a wave file
     error = "All attempts to load audio file %r failed." % filename
     try:

madmom/processors.py

@@ -51,9 +51,11 @@ def load(cls, infile):
         """
         import pickle
         # close the open file if needed and use its name
-        if not isinstance(infile, str):
+        try:
             infile.close()
             infile = infile.name
+        except AttributeError:
+            pass
         # instantiate a new Processor and return it
         with open(infile, 'rb') as f:
             # Python 2 and 3 behave differently

tests/test_audio_signal.py

@@ -11,6 +11,7 @@
 import tempfile
 import unittest
 from os.path import join as pj
+import sys
 
 from . import AUDIO_PATH, DATA_PATH
 from .test_audio_comb_filters import sig_1d, sig_2d
@@ -723,6 +724,9 @@ def test_types(self):
         self.assertIsInstance(signal, np.ndarray)
         self.assertTrue(signal.dtype == np.int16)
         self.assertTrue(type(sample_rate) == int)
+        if sys.version_info[0] == 2:
+            # test unicode string type (Python 2 only)
+            signal, sample_rate = load_audio_file(unicode(sample_file))
 
     def test_file_handle(self):
         # test wave loader