New collection scanner

[Leo Franchi]

Hi Ralf,

An update. After your various fixes, scanning is much faster now (yay 
QSharedMemory!)

Now it gets stuck at 24%, here is the debug output:

http://pastebin.com/HPadHHtf

leo

On Wednesday, November 03, 2010 06:09:35 PM Ralf Engels wrote:
> Hi all,
> since this morning (very early) the new collection scanner is integrated.
> 
> It should allow us to implement exiting new features and it also has some
> benefits over the old scanner.
> 
> However the change is quite big and we even might want to revert the fix if
> serious problems come up.
> 
> For now a short overview about the new features and already known problems.
> 
> - The new scanner should be smarter in figuring out if an album is a
> compilation or not. If "compilation" is set by the user this information
> should also be saved and used in the next scanning run. - Rating, playcount
> and score should be saved and restored.
> - The playlist and collection view should be always up-to-date. There might
> be an empty album if all songs are removed from one. There should however
> never be a case where right-clicking on a track does not bring up a context
> menu. - The scanner should be a lot smarter in detecting which cover
> belongs to which album.
> 
> known issues:
> - Probably the most severe issue right now: The scanning seems to hang
> sometimes. Sometimes meaning once every four full scans on my machine.
>  If you have such a problem: please send me the last few debug output
>  lines from the scanner.
> - The progress bar is not progressing to 100%
>  Actually I couldn't really figure out yet why this happens but
>  I will eventually.
> - The scanner will mark an album with a single track as compilation more
> often than the old one did. I am still not sure if this is good or bad. For
> now I think it's a little annoying that a lot of my singles appear under
> "various artists". So, if you have any opinions please drop me a message.
> - If you see two albums with the same name and artist that appear in the
> collection. That is probably an album with two different album artists and
> not directly connected to the scanner.
> 
> performance:
> - I have done perfomance tests with the scanner processor but not with the
> whole scanner as such. The scanner is reading more information than before
> but that shouldn't slow it down by much. However lfranchi has reported an
> increased scanning time.
>  If you also have this impression please try to give me some numbers.
>  The scanning time of 20000 mp3 files on a local disk should be below three
> minutes.
> 
> 
> Any new bugs, complaints or improvement request can be directed to me
> directly, IRC, bug tracker or as a patch on the review board. As always.
> 
> Cheers,
> Ralf
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leo at kdab.com                                 KDAB (USA), LLC
lfranchi at kde.org                             The KDE Project