Only reload album art in the HTTP interface if the track id changes (or if the user clicks on the album art to force a reload).

* Allow getting album art for items which aren't playing (using /art?id=<the playlist id> instead of /art). (You need to run with --album-art 2 if you want to have album art for items which haven't already played)
* Workarround a stupid assert in input_GetItem.

Ogg/flac doesn't work (yet)

Also remove the volatile qualifier.
No, volatile does not magically solve threading bugs, sorry
I too have tried this "easy" path, it does REALLY NOT WORK.
volatile only solves signals concurrency, not threads concurrency.

By the way, using asprintf(&ptr)/free(ptr) to determine the length of a string
is really lame, when you can do the same with snprintf(NULL, 0);

Fix playlist_item_t.i_id vs input_item_t.i_id mess in HTTP interface. (Looks like this was new in 0.9.0. Having 2 differents integer ids, one being used to play and the other needed to delete the item is kind of awkward.)

Googleimage to use artist-tag and do url-encode (example taken from
http://www.redwiki.net/wiki/wiki.php/LUA/URLencode%B1%B8%C7%F6%C4ڵ%E5 )

Second try, show save meta button if user changes any input field, also
then set in_edit=true so playlist changes doesn't change meta-data what
to edit.

- Add rtcp boolean to emit RTCP SR

Edit mediainfo so you can edit meta-data even when playitem changes in
background. Also sets default to readonly, so user can't change meta if
he/she doesn't want to edit it. First try ;)

Patch by Ilkka Ollakka, modified by myself to rip-off extra spaces, to modify a constant one and not 4 times, and functions placement in the code.

Doesn't fix input memleaks (playlist.m:204-214)

Fix [21193]