Merge pull request jiaaro#421 from sunjerry019/master

Add try/finally to pyaudio to stop stream gracefully despite interrupts

AUTHORS

@@ -78,3 +78,6 @@ Antonio Larrosa
 
 Aaron Craig
     github: craigthelinguist
+
+Yudong Sun
+    github: sunjerry019

pydub/playback.py

@@ -28,22 +28,25 @@ def _play_with_pyaudio(seg):
                     rate=seg.frame_rate,
                     output=True)
 
-    # break audio into half-second chunks (to allows keyboard interrupts)
-    for chunk in make_chunks(seg, 500):
-        stream.write(chunk._data)
-
-    stream.stop_stream()
-    stream.close()
+    # Just in case there were any exceptions/interrupts, we release the resource
+    # So as not to raise OSError: Device Unavailable should play() be used again
+    try:
+        # break audio into half-second chunks (to allows keyboard interrupts)
+        for chunk in make_chunks(seg, 500):
+            stream.write(chunk._data)
+    finally:
+        stream.stop_stream()
+        stream.close()
 
-    p.terminate()
+        p.terminate()
 
 
 def _play_with_simpleaudio(seg):
     import simpleaudio
     return simpleaudio.play_buffer(
-        seg.raw_data, 
-        num_channels=seg.channels, 
-        bytes_per_sample=seg.sample_width, 
+        seg.raw_data,
+        num_channels=seg.channels,
+        bytes_per_sample=seg.sample_width,
         sample_rate=seg.frame_rate
     )
 
@@ -59,13 +62,13 @@ def play(audio_segment):
         pass
     else:
         return
-    
+
     try:
         _play_with_pyaudio(audio_segment)
         return
     except ImportError:
         pass
     else:
         return
-    
+
     _play_with_ffplay(audio_segment)