[ID3 Dev] Why is footer not included in total size?

[Jim]

I think some of those tags could be useful but I also think we would want to
have some more complex example/sample tags, both to test proper reading of a
tag and to test whether a reader can catch bad tags and how it handles them.
(I think creating the set of bad tags would be much more complex because
there could be many possible conditions to be tested.  I'm thinking of
starting with some simple cases like repeating a frame that should be unique
and maybe something like a text frame that contains no encoding.)

I think more complicated tags would be useful because one of the first
projects I was working on involved reading/writing multiple 'TXXX' frames
and I found more than one other reading/writing app that expected TXXX
frames to be unique and only have one per tag.

Do we have anyone that is volunteering to collects/sort the tags into some
kind of compilation?  I would be willing to do this but I am hoping that
perhaps there is someone out there with a more thorough knowledge of ID3v2
tags that could be in charge (and I could still help).  I readily admit that
my knowledge of and experience with ID3v2 tags is mostly limited to the text
information frames.

Or perhaps we could merge this with the wiki project that Ben Bennett was
talking about to provide a better forum for submission of sample tags as
well as discussion about proper handling for some of the gray areas.  (This
mailing list is useful but with so many possible topics spinning off from
these tags I think an online forum would be a better way to manage the
discussions and avoid flooding this mailing list.)  And I would hope for at
least a little involvement from some of the people running or helping with
the id3.org website.  (This project could perhaps keep a more up to date
list of non-compliant software.)

Jim

----- Original Message ----- 
From: "Paul Taylor" <paul_t100 at fastmail.fm>
To: <id3v2 at id3.org>
Sent: Wednesday, November 22, 2006 5:01 AM
Subject: Re: [ID3 Dev] Why is footer not included in total size?


> Within the opensource jaudiotagger project
> (https://jaudiotagger.dev.java.net/) I do some automatic testing, and as
> part of this we have some test mp3 files (testdata) and some test id3
> tags (testtagdata) which we add to an mp3 at testing time to test
> conformance. I certainly hope to increase the number of testtags and
> would appreciate any help, the test tags could be used for conformance
> in any project only the testing mechanism itself is tied to
> jaudiotagger. Curently the id3 files have been extracted from mp3 files
> but my idea time permitting would be in the first instance to create a
> series of very simple tags, each containing a single frame to test
> reading of frames, testing writing of frames is a bit more involved.
>
> Paul
>
> Jim wrote:
> > Even if a comprehensive test suite was not created, I think it would
still
> > be better to have more example tags/files to use for testing a
particular
> > app.  Perhaps someone could be in charge of compiling submissions from
> > developers or other people that submit tags for use in testing?  (That
> > person would have to have a thorough knowledge of the spec/standards.
> > Perhaps someone that has developed or is developing a fully compliant
ID3v2
> > application?)  If this project was started now, eventually it could
claim to
> > be a comprehensive set of example tags once enough submissions were
> > received.
> >
> > And if the order that the frames are written is carefully controlled, is
> > there something else that would cause a written tag to not be
bit-for-bit
> > identical to an example tag?  (That's assuming it followed the model of
the
> > example tag, like having/not having an extended header, using
> > unsynchronization, etc.)
> >
> > Jim
> >
> >
> > ----- Original Message ----- 
> > From: "Scott Wheeler" <wheeler at kde.org>
> > To: <id3v2 at id3.org>
> > Sent: Tuesday, November 21, 2006 7:53 AM
> > Subject: Re: [ID3 Dev] Why is footer not included in total size?
> >
> >
> >
> >> Ray Manning wrote:
> >>
> >>> Is Martin Nilsson active on this list?
> >>>
> >>>
> >> I've not seen anything ID3 related from him in years.
> >>
> >>
> >>> Example tags
> >>> A comprehensive test suite for all versions of ID3 tags are currently
> >>>
> > under
> >
> >>> development. The test suite includes both conforming tags and
> >>>
> > non-conforming
> >
> >>> tags so that both standards coformance and software robustness can be
> >>> tested. Part of these will be released as example tags while the rest
> >>>
> > will
> >
> >>> be sold to cover development and running expenses. If you are
> >>>
> > interested,
> >
> >>> contact Martin Nilsson.
> >>>
> >>> While waiting for the ID3v2 test suite, feel free to try the
> >>>
> > ID3v1/ID3v1.1
> >
> >>> test suite.
> >>>
> >>> --------------------------------------
> >>>
> >>> That seems to imply to me that people have been waiting for example
tags
> >>> since v1.
> >>>
> >>>
> >> And they'll keep waiting until someone takes up the not-terribly-fun
> >> task of creating such a suite.  It being a good idea won't make it
happen.
> >>
> >> Even from there you've got a lot of obstacles:
> >>
> >> - It's going to be hard to get together multiple people that know the
> >> spec well to do bit-for-bit compliance checks.
> >> - Most implementations don't even claim to do the whole spec.
> >> - Writing is much more interesting than reading compliance-wise and
> >> it's very difficult to set things up to get bit-for-bit output matches
> >> even with compliant implementations.
> >>
> >> -Scott
> >>
> >>
> >>
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> >>
> >>
> >>
> >
> >
> >
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> >
> >
> >
>
>
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