File mediatomb-taglib-readonly.patch of Package mediatomb

Mediatomb uses the TagLib::FileRef(char*) constructor of taglib. This
will open the file in read-write mode and thus trigger a CLOSE_WRITE
notify event for the file afterwards. This, obviously, makes mediatomb
re-read the file if inotify-support is enabled. This causes unnecessary
load during initial scanning and may even make mediatomb fail to work
for UPNP clients that read the album art while displaying the object
list (as the object ID is unexpectedly changed). This is fixed by the
patch mediatomb-taglib-readonly.patch which uses TagLib::FileStream in
read-only mode.
diff -ur mediatomb-0.12.1.svn2103.orig/src/metadata/taglib_handler.cc mediatomb-0.12.1.svn2103/src/metadata/taglib_handler.cc
--- mediatomb-0.12.1.svn2103.orig/src/metadata/taglib_handler.cc	2012-11-09 03:02:02.306177095 +0100
+++ mediatomb-0.12.1.svn2103/src/metadata/taglib_handler.cc	2018-04-13 15:32:24.990041623 +0200
@@ -45,6 +45,7 @@
 #include <attachedpictureframe.h>
 #include <textidentificationframe.h>
 #include <tstring.h>
+#include <tfilestream.h>
 
 #include "taglib_handler.h"
 #include "string_converter.h"
@@ -135,7 +136,9 @@
     Ref<Array<StringBase> > aux;
     Ref<StringConverter> sc = StringConverter::i2i();
 
-    TagLib::FileRef f(item->getLocation().c_str());
+    // use read-only file stream to prevent unnecessary inotify events
+    TagLib::FileStream fs(item->getLocation().c_str(), true);
+    TagLib::FileRef f(&fs, true);
 
     if (f.isNull() || (!f.tag()))
         return;
@@ -192,7 +195,7 @@
 
     // did not yet found a way on how to get to the picture from the file
     // reference that we already have
-    TagLib::MPEG::File mp(item->getLocation().c_str());
+    TagLib::MPEG::File mp(&fs, TagLib::ID3v2::FrameFactory::instance());
 
     if (!mp.isValid() || !mp.ID3v2Tag())
         return;
@@ -274,8 +277,10 @@
 
 Ref<IOHandler> TagHandler::serveContent(Ref<CdsItem> item, int resNum, off_t *data_size)
 {
+    // use read-only file stream to prevent unnecessary inotify events
+    TagLib::FileStream fs(item->getLocation().c_str(), true);
     // we should only get mp3 files here
-    TagLib::MPEG::File f(item->getLocation().c_str());
+    TagLib::MPEG::File f(&fs, TagLib::ID3v2::FrameFactory::instance());
 
     if (!f.isValid())
         throw _Exception(_("TagHandler: could not open file: ") +