more efficient of updating of metadata

git-svn-id: https://svn.musicpd.org/mpd/trunk@1277 09075e82-0dd4-0310-85a5-a0d7c8717e4f

3 files changed, 35 insertions, 12 deletions

diff --git a/src/playlist.c b/src/playlist.c
index 429bfe903..4d9c0da96 100644
--- a/src/playlist.c
+++ b/src/playlist.c
@@ -735,23 +735,22 @@ int playPlaylist(FILE * fp, int song, int stopOnError) {
 }
 
 void syncCurrentPlayerDecodeMetadata() {
-        long i = 0;
         Song * songPlayer = playerCurrentDecodeSong();
         Song * song;
 
         if(!songPlayer) return;
 
-        for(i=0; i<playlist.length; i++) {
-                song = playlist.songs[i];
+	if(playlist_state!=PLAYLIST_STATE_PLAY);
 
-                if(song->type == SONG_TYPE_URL &&
-                                0 == strcmp(song->utf8url,  
-                                songPlayer->utf8url))
-                {
-                        if(song->tag) freeMpdTag(song->tag);
-                        song->tag = mpdTagDup(songPlayer->tag);
-	                incrPlaylistVersion();
-                }
+        song = playlist.songs[playlist.order[playlist.current]];
+
+        if(song->type == SONG_TYPE_URL &&
+                        0 == strcmp(song->utf8url, songPlayer->utf8url) &&
+                        !mpdTagsAreEqual(song->tag, songPlayer->tag))
+        {
+                if(song->tag) freeMpdTag(song->tag);
+                song->tag = mpdTagDup(songPlayer->tag);
+                incrPlaylistVersion();
         }
 }
 
diff --git a/src/tag.c b/src/tag.c
index 2c58a3c16..ae9d41040 100644
--- a/src/tag.c
+++ b/src/tag.c
@@ -184,4 +184,26 @@ MpdTag * mpdTagDup(MpdTag * tag) {
 
 	return ret;
 }
-/* vim:set shiftwidth=4 tabstop=8 expandtab: */
+
+int mpdTagStringsAreEqual(char * s1, char * s2) {
+        if(s1 && s2) {
+                if(strcmp(s1, s2)) return 0;
+        }
+        else if(s1 || s2) return 0;
+
+        return 1;
+}
+
+int mpdTagsAreEqual(MpdTag * tag1, MpdTag * tag2) {
+        if(tag1 == NULL && tag2 == NULL) return 1;
+        else if(!tag1 || ! !tag2) return 0;
+
+        if(tag1->time != tag2->time) return 0;
+
+        if(!mpdTagStringsAreEqual(tag1->artist, tag2->artist)) return 0;
+        if(!mpdTagStringsAreEqual(tag1->album, tag2->album)) return 0;
+        if(!mpdTagStringsAreEqual(tag1->track, tag2->track)) return 0;
+        if(!mpdTagStringsAreEqual(tag1->title, tag2->title)) return 0;
+
+        return 1;
+}
diff --git a/src/tag.h b/src/tag.h
index a06750cf9..87cac2b97 100644
--- a/src/tag.h
+++ b/src/tag.h
@@ -45,5 +45,7 @@ MpdTag * mpdTagDup(MpdTag * tag);
 
 void validateUtf8Tag(MpdTag * tag);
 
+int mpdTagsAreEqual(MpdTag * tag1, MpdTag * tag2);
+
 #endif
 /* vim:set shiftwidth=4 tabstop=8 expandtab: */