Added Denon mixer support

mopidy/mixers/denon.py

@@ -0,0 +1,27 @@
+from serial import Serial
+
+from mopidy.mixers import BaseMixer
+from mopidy.settings import MIXER_PORT
+
+
+class DenonMixer(BaseMixer):
+    def __init__(self):
+        self._device = Serial(port=MIXER_PORT)
+        self._levels = ['99']+["%(#)02d"% {'#': v} for v in range(0,99)]
+        self._volume = None
+
+    def _get_volume(self):
+        # The Denon spec doesnt seem to document
+        # how to query the volume, so we keep the
+        # state internally
+        return self._volume
+
+    def _set_volume(self, volume):
+        # Clamp according to Denon-spec
+        if not volume:
+            volume = 0
+        elif volume > 99:
+            volume = 99
+
+        self._volume = volume
+        self._device.write('MV%s\r'% self._levels[volume])

mopidy/settings/default.py

@@ -38,12 +38,28 @@ CONSOLE_LOG_FORMAT = u'%(levelname)-8s %(asctime)s [%(threadName)s] %(name)s\n
 #: Default on other operating systems::
 #:
 #:     MIXER = u'mopidy.mixers.dummy.DummyMixer'
+#:
+#: *Using external mixers*
+#:
+#: Using external mixers depends on the pyserial-library,
+#: so make sure you have it installed. It also adds one
+#: more setting, MIXER_PORT. This must point to the device
+#: port like /dev/tty1 or similar.
+#:
+#: Available external Mixers::
+#:
+#:
+#:     MIXER = u'mopidy.mixers.denon.DenonMixer'
+#:     MIXER_PORT = u'/dev/tty0' # Verify this manually
+#:
 MIXER = u'mopidy.mixers.dummy.DummyMixer'
 if sys.platform == 'linux2':
     MIXER = u'mopidy.mixers.alsa.AlsaMixer'
 elif sys.platform == 'darwin':
     MIXER = u'mopidy.mixers.osa.OsaMixer'
 
+MIXER_PORT=None
+
 #: Which address Mopidy should bind to. Examples:
 #:
 #: ``localhost``

tests/__main__.py

@@ -10,6 +10,7 @@ def main():
         os.path.abspath(os.path.join(os.path.dirname(__file__), '../')))
     r = CoverageTestRunner()
     r.add_pair('mopidy/mixers/dummy.py', 'tests/mixers/dummytest.py')
+    r.add_pair('mopidy/mixers/denon.py', 'tests/mixers/denontest.py')
     r.add_pair('mopidy/models.py', 'tests/modelstest.py')
     r.add_pair('mopidy/mpd/handler.py', 'tests/mpd/handlertest.py')
     r.run()

tests/mixers/denontest.py

@@ -0,0 +1,31 @@
+import unittest
+import os
+
+from mopidy.mixers.denon import DenonMixer
+
+class DenonMixerTest(unittest.TestCase):
+    def setUp(self):
+        self.m = DenonMixer()
+        self.m._device = os.tmpfile() # "Mock" :-)
+
+    def tearDown(self):
+        self.m._device.close()
+
+    def test_volume_is_None_initially(self):
+        self.assertEqual(self.m.volume, None)
+
+    def test_volume_set_to_min(self):
+        self.m.volume = 0
+        self.assertEqual(self.m.volume, 0)
+
+    def test_volume_set_to_max(self):
+        self.m.volume = 100
+        self.assertEqual(self.m.volume, 99)
+
+    def test_volume_set_to_below_min_results_in_min(self):
+        self.m.volume = -10
+        self.assertEqual(self.m.volume, 0)
+
+    def test_volume_set_to_above_max_results_in_max(self):
+        self.m.volume = 110
+        self.assertEqual(self.m.volume, 99)