[python] add mygetopt.py and the current reserve_audio code

git-svn-id: svn+ssh://jackaudio.org/trunk/jack@4441 0c269be4-1314-0410-8aa9-9f06e86f4224

python/mygetopt.py

@@ -0,0 +1,48 @@
+#!/usr/bin/env python
+
+import getopt
+
+def my_getopt(args, shortopts, longopts = []):
+    """getopt(args, options[, long_options]) -> opts, args
+
+    Parses command line options and parameter list.  args is the
+    argument list to be parsed, without the leading reference to the
+    running program.  Typically, this means "sys.argv[1:]".  shortopts
+    is the string of option letters that the script wants to
+    recognize, with options that require an argument followed by a
+    colon (i.e., the same format that Unix getopt() uses).  If
+    specified, longopts is a list of strings with the names of the
+    long options which should be supported.  The leading '--'
+    characters should not be included in the option name.  Options
+    which require an argument should be followed by an equal sign
+    ('=').
+
+    The return value consists of two elements: the first is a list of
+    (option, value) pairs; the second is the list of program arguments
+    left after the option list was stripped (this is a trailing slice
+    of the first argument).  Each option-and-value pair returned has
+    the option as its first element, prefixed with a hyphen (e.g.,
+    '-x'), and the option argument as its second element, or an empty
+    string if the option has no argument.  The options occur in the
+    list in the same order in which they were found, thus allowing
+    multiple occurrences.  Long and short options may be mixed.
+
+    """
+
+    opts = []
+    if type(longopts) == type(""):
+        longopts = [longopts]
+    else:
+        longopts = list(longopts)
+    if args and args[0].startswith('-') and args[0] != '-':
+        if args[0] == '--':
+            args = args[1:]
+        if args[0].startswith('--'):
+            opts, args = getopt.do_longs(opts, args[0][2:], longopts, args[1:])
+        else:
+            opts, args = getopt.do_shorts(opts, args[0][1:], shortopts, args[1:])
+
+	return opts, args
+    else:
+	return None, args
+

python/reserve_audio.py

@@ -0,0 +1,63 @@
+
+import dbus.service
+import gobject
+import dbus.mainloop.glib
+
+rr = None
+
+class reservation_t( dbus.service.Object ):
+    def __init__( self, device_name, prio, override_cb=None ):
+
+        self.dev_name    = device_name
+	self.prio        = prio
+	self.override_cb = override_cb
+
+	self.bus = dbus.SessionBus()
+
+        dbus.service.Object.__init__( self, None, 
+                "/org/freedesktop/ReserveDevice1/" + self.dev_name,
+                dbus.service.BusName( "org.freedesktop.ReserveDevice1." + self.dev_name, bus=self.bus, allow_replacement=True, replace_existing=True, do_not_queue=True ) )
+
+    @dbus.service.method( dbus_interface="org.freedesktop.ReserveDevice1", in_signature="i", out_signature="b" )
+    def RequestRelease( self, prio ):
+	if prio < self.prio:
+	    return False
+
+	if self.override_cb:
+	    if self.override_cb( self.device_name ):
+		self.connection.release_name( 'org.freedesktop.ReserveDevice1.' + self.dev_name )
+		return True
+
+	return False
+
+
+
+def reserve_dev( dev_name, prio, override_cb ):
+    global rr
+    try:
+	session_bus = dbus.SessionBus()
+    except Exception:
+	return
+
+    try:
+	r_proxy = session_bus.get_object( "org.freedesktop.ReserveDevice1." + dev_name, "/org/freedesktop/ReserveDevice1/" + dev_name )
+	r_iface = dbus.Interface( r_proxy, "org.freedesktop.ReserveDevice1" )
+    except Exception:
+	rr = reservation_t( dev_name, prio, override_cb )
+	return
+
+    if not r_iface.RequestRelease( prio ):
+	raise Exception
+
+    rr = reservation_t( dev_name, prio, override_cb )
+
+
+
+dbus.mainloop.glib.threads_init() 
+dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
+
+def run_main():
+    loop = gobject.MainLoop()
+    loop.run()
+
+