From 48b7d6d36d562284ee3da4538d5b5990306bb45d Mon Sep 17 00:00:00 2001
From: kaliko <kaliko@azylum.org>
Date: Fri, 6 Aug 2010 12:40:07 +0000
Subject: [PATCH]  * nalbum : new fade out/in feature for album transition  *
 startop.py : some comments

---
 lib/startop.py |  6 ++++--
 nalbum         | 48 ++++++++++++++++++++++++++++++++++++++++++++----
 2 files changed, 48 insertions(+), 6 deletions(-)

diff --git a/lib/startop.py b/lib/startop.py
index 44cb64a..945e5bb 100644
--- a/lib/startop.py
+++ b/lib/startop.py
@@ -51,12 +51,14 @@ class StartOpt(object):
     """
     """
 
-    def __init__(self, script_info, options):#{{{
+    def __init__(self, script_info, child_options):#{{{
         self.parser = None
         self.cli_options = dict({})
         self.cli_args = dict({})
         self.info = dict(script_info)
-        self.options = list(options + OPTS)
+        # options allows to add new cli options within child objects calling
+        # parent __init__()
+        self.options = list(child_options + OPTS)
         self.main()#}}}
 
     def declare_opts(self):#{{{
diff --git a/nalbum b/nalbum
index a0ed04f..c2e3110 100755
--- a/nalbum
+++ b/nalbum
@@ -21,28 +21,62 @@
 
 import sys
 
+from time import sleep
+
 from lib.mpdclass import MPDClass
 from lib.startop import StartOpt
 
 NAME = 'nalbum'
 VERSION = '0.1'
 
+NALBUM_OPTS = list([
+    {
+        'sw': ['-c', '--crossfade'],
+        'type': 'int',
+        'dest': 'time',
+        'metavar': 't',
+        'help': 'fade out/fade in over t seconds.'},
+    ])
+
+
 class Nalbum(StartOpt, MPDClass):
     """
     """
     script_info = dict({
         'version': VERSION,
         'prog_name': NAME,
-        'description': 'Seek to next album in playlist.',
+        'description': 'Jump to next album in playlist.',
         })
 
     def __init__(self):
         """"""
-        StartOpt.__init__(self, self.__class__.script_info, [])
+        StartOpt.__init__(self, self.__class__.script_info, NALBUM_OPTS)
         MPDClass.__init__(self)
         self._run()
 
-    def _get_next(self):
+    def _fade(self, io='out'):#{{{
+        """
+        end_volum => End volume value
+        mpd_vol   => Start volume value
+        """
+        mpd_vol = int(self.init_vol)
+        if io == 'out':
+            end_volum = mpd_vol / 10
+            mpd_vol = self.init_vol
+        if io == 'in':
+            end_volum = int(self.init_vol)
+            mpd_vol = int(self.init_vol) / 10
+        span = float(end_volum - mpd_vol)
+        step = span / float(10*self.cli_options.time)
+        while 42:
+            mpd_vol += step
+            self.client.setvol(int(mpd_vol))
+            if abs(mpd_vol - end_volum) < 1:
+                self.client.setvol(end_volum)
+                return True
+            sleep(0.1)#}}}
+
+    def _get_next(self):#{{{
         """Retrieve playlist from current song to the end."""
         if 'song' not in self.client.status():
             print "No current song set in MPD!"
@@ -62,13 +96,19 @@ class Nalbum(StartOpt, MPDClass):
                 sys.exit(0)
             album = self.client.playlistinfo(next_album_pos)[0].get('album', 'TAG MISSING')
         print 'Next album appears to be: "%s"' % album
-        return next_album_pos
+        return next_album_pos#}}}
 
     def _run(self):
         """"""
         print 'Connecting %s:%i' % (self.cli_options.host, self.cli_options.port)
         self.mpdConnect()
+        self.init_vol = int(self.client.status().get('volume'))
+        if self.cli_options.time:
+            print 'Cross fading next album'
+            self._fade()
         self.client.play(self._get_next())
+        if self.cli_options.time:
+            self._fade(io='in')
         self.client.disconnect()
         sys.exit(0)
 
-- 
2.39.5