Remove pycaw as a dependency, add a warning if unable to install, and do not return a volume session when pycaw can't be imported.

Author: Neko

README.md

@@ -80,7 +80,7 @@ virtualenv airplay2-receiver
 cd airplay2-receiver
 .\Scripts\activate
 pip install -r requirements.txt
-pip install pipwin
+pip install pipwin pycaw
 pipwin install pyaudio
 
 python ap2-receiver.py -m myap2 -n [YOUR_INTERFACE_GUID] (looks like this for instance {02681AC0-AD52-4E15-9BD6-8C6A08C4F836} )

ap2/utils.py

@@ -5,7 +5,12 @@
 import subprocess
 
 if platform.system() == "Windows":
-    from pycaw.pycaw import AudioUtilities, ISimpleAudioVolume
+    try:
+        from pycaw.pycaw import AudioUtilities, ISimpleAudioVolume
+    except ImportError:
+        AudioUtilities = None
+        ISimpleAudioVolume = None
+        print('[!] Pycaw is not installed - volume control will be unavailable', )
 
 def get_logger(name, level="INFO"):
     logging.basicConfig(filename="%s.log" % name,
@@ -43,7 +48,7 @@ def interpolate(value, from_min, from_max, to_min, to_max):
     return to_min + (value_scale * to_span)
 
 def get_pycaw_volume_session():
-    if platform.system() != 'Windows':
+    if platform.system() != 'Windows' or AudioUtilities is None:
         return
     session = None
     for s in AudioUtilities.GetAllSessions():

requirements.txt

@@ -10,4 +10,3 @@ cryptography
 requests
 av
 numpy
-pycaw