# HG changeset patch
# User Amine Sehili <amine.sehili@gmail.com>
# Date 1546974858 -3600
# Node ID cee5037f17adf145e0842341ec17c14ffbb770dd
# Parent  ccab869cdbcbaf9ffeb316b546b55429d2bd3748
Add _guess_audio_format

diff -r ccab869cdbcb -r cee5037f17ad auditok/io.py
--- a/auditok/io.py	Mon Jan 07 21:12:10 2019 +0100
+++ b/auditok/io.py	Tue Jan 08 20:14:18 2019 +0100
@@ -52,6 +52,13 @@
                                   "multiple of `sample_width * channels`")
 
 
+def _guess_audio_format(fmt, filename):
+    if fmt is None:
+        extension = os.path.splitext(filename.lower())[1][1:]
+        return extension if extension else None
+    return fmt.lower()
+
+
 class AudioSource():
     """ 
     Base class for audio source objects.