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Tag Cache (Tagdatabase) fileformat

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akleinwaechter:
Hi,

in which format is the tagcache stored in Rockbox? Can I access the content of the cache with an external programm on a pc?

I would like to write a small programm that imports the the additional information (how often played, last played...) to musikcube (and if possible vice versa). I did this stuff from iTunes to musikcube already. If I can manage this last step. I leave iTunes behind me  ;D

Best regards
Alex

bascule:
To start off, the data is stored (as plain text) in the *.tcd files in /.rockbox

I know someone has written a program to interrogate the files, but I can't access the Wiki at the moment to check.

EDIT: My mistake, it was to generate database files from the iTunes db:
http://www.rockbox.org/twiki/bin/view/Main/ConvertiTunesDBtoTagCache

last.fm (audioscrobbler) logging support, however, is built in to rockbox. Maybe you could turn that setting on and use that data instead. This looks more promising...

http://www.rockbox.org/twiki/bin/view/Main/LastFMLog

roolku:

--- Quote from: akleinwaechter on January 29, 2007, 08:47:35 AM ---in which format is the tagcache stored in Rockbox?

--- End quote ---

AFAIU The database_*.tcd files contain a sorted list of all unique values for a particular (text-) tag - including the filepath in database_4.tcd - and a pointers back to the main index file. The main index database_idx.tcd contains the tag entries for every file, where numerical tags are stored directly and text tags are represented as an offset in the database_*.tcd file.


--- Quote from: akleinwaechter on January 29, 2007, 08:47:35 AM ---Can I access the content of the cache with an external programm on a pc?

--- End quote ---

Possible, but not straight forward. For example you have to take into account the endianness of your platform.


--- Quote from: akleinwaechter on January 29, 2007, 08:47:35 AM ---I would like to write a small programm that imports the the additional information (how often played, last played...) to musikcube (and if possible vice versa).

--- End quote ---

Have you considered using the export and import function ? The generated text file should be a lot easier to parse or generate.

akleinwaechter:
Thank you all for your replies. I will take a closer look to the import and export functions. If the additional information is included it will be the solution.  I will post my programm when finished.

Alex

bzavala:
I was just looking at muskcube a couple of days ago and also thought how could it'd be if from rockbox, there was a way to update how often a file has been played...

So I take it, the Tag Cache does not store count or last played... is this correct?

Also..  is there a program to generate the tag cache file from a PC?  my music folder on my ipod is synched to my music folder on my PC....  I ask because when you try to create or update the tag cache using the device, it takes some time...

Thanks!

Ben

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