add External subtitles (#4175)

-[InfoBar] search for srt/ass/ssa file next to the movie file and use
the first found as external subtitle
-[iservice] add setSubUri

lib/python/Screens/InfoBar.py

@@ -1,6 +1,7 @@
 from Tools.Profile import profile
 from enigma import eServiceReference
-import os
+from glob import glob
+from os.path import splitext
 
 # workaround for required config entry dependencies.
 import Screens.MovieSelection
@@ -202,6 +203,17 @@ def __init__(self, session, service, slist=None, lastservice=None, infobar=None)
 		self.servicelist = slist
 		self.infobar = infobar
 		self.lastservice = lastservice or session.nav.getCurrentlyPlayingServiceOrGroup()
+
+		path = service and service.getPath() and splitext(service.getPath())[0] or ""
+		subs = []
+		if path:
+			for sub in ("srt", "ass", "ssa"):
+				subs = glob("%s*.%s" % (path, sub))
+				if subs:
+					break
+		if subs:
+			service.setSubUri(subs[0])  # Support currently only one external sub
+
 		session.nav.playService(service)
 		self.cur_service = service
 		self.returning = False

lib/service/iservice.h

@@ -54,9 +54,11 @@ class eServiceReference
 #ifndef SWIG
 	int data[8];
 	std::string path;
+	std::string suburi;
 #endif
 	std::string getPath() const { return path; }
 	void setPath( const std::string &n ) { path=n; }
+	void setSubUri( const std::string &n ) { suburi=n; }
 
 	unsigned int getUnsignedData(unsigned int num) const
 	{