[ID3 Dev] TIPL and TCOM.

Tom Sorensen tsorensen at gmail.com
Thu May 8 11:08:08 PDT 2008

On Thu, May 8, 2008 at 1:15 PM, Peter van Hardenberg
<pvh at songbirdnest.com> wrote:
> Should a full, correct ID3v2 implementation check TIPL for a composer if the TCOM frame is not present?

For what purpose?

If TCOM is not present, you certainly cannot tell what TIPL may hold
(on the rare occasion that either one is actually set). TIPL could
include things like the cover art designer, the mixer, and even the
intern who ran out and got doughnuts every morning.

> Is POPL the only, best way to store ratings? What is the recommended method for storing rating information for an application which is not going to store user emails or play counts?

I presume you mean POPM, as there is no standard POPL frame. Again,
rarely used, but it's the only thing in the standard for that kind of
thing. I'm not sure what other players do; iTunes stores its info in
its own database.

> TXXX:Rating?

Doesn't matter much -- once you're using a TXXX frame then there's no
standard at all. Your best bet is to see what other players do and
copy it (either POPM or their own TXXX frame) if you want to be able
to exchange the data.

Tom Sorensen

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