Craig Markwardt <craig.markwardt@gmail.com> found out that the 30-minute
timeout in iTunes was caused by the lack of reply to update requests.
We now send out replies every 5 minutes, avoiding the timeout and
disconnection.
Thanks to Craig for digging into this, producing code to demonstrate the fix
and trying out a few more ideas for update support beyond this fix.
Handling of the sort tags was left into httpd_daap.c where the code runs
after the song is added to the songlist - effectively adding the sort tags
to the *next* song, leading to incorrect sort tags on the current song.
Auto-logout currently doesn't work as expected and breaks streaming etc once
the timeout occurs. Disable it until we can make it work as expected.
Maybe we'll need to upgrade the DAAP version.
Otherwise the closecb is called when the connection is closed/freed during
deinit, and this happens in the HTTP cleanup after the DAAP and DACP cleanups
have run, leading to spurious "struct update_request not found" messages.
It is now clear that multi-library support will not happen, so remove whatever
provisions were in the code for that.
It comes with a small change to the configuration file, too.
With this, DB schema version went to 9.
Store groups (only album groups supported at the moment) in the DB,
so their ids are persistent for the duration of the forked-daapd session.
Those ids are used to, among other things, retrieve artwork, so we must
provide ourselves some persistence here.
This brings us to schema version 8.
songalbumid is used a lot in queries from Remote; computing the hash for
each row is a major waste of time on big libraries and slow machines, so
let's store the hash in the table.
This brings us to schema version 7.
Some metadata were filtered out from the reply by directly checking
for their hash, including the hash value in the code. Remove the magic
values and compare dfm->field against the relevant dmap_* field as for
other special cases.
Update field types, add new fields (commented out). This fixes a number
of mis-assigned types. Update generated from the result of a /content-codes
request.
