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

[Paul Taylor]

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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