[ID3 Dev] Unsynchronization for Dummies

[Matthias Mayrock]

  Hi Peter,

thank you for your reply. I will follow your advice and try to
not write synchronized tags at all.

Nevertheless I'll want to support the feature and I think I got
it now. What confused me was that the spec of 2.4 states that
the frame header includes the size after unsynchronization.

If I understand this correctly it is only the case if the whole tag
has unsynchronization turned off but a frame turned it on. This
would at least make sense to me. So if a tag has unsynchronization
turned off, but the tag turned on, the frame size includes the size
after unsynchronization.

thank you very much and best wishes,

matthias mayrock



Am 8/8/2010 5:34 PM, schrieb Peter Bennett:
> Hi Matthias
>
> I recommend against writing Unsynchronized  frames. Players do not 
> need them these days, and one version of Windows media player would 
> not play an mp3 file file if the tag had unsynchronized frames. My 
> method is to be able to read unsynchronized frames but not to write them.
>
> Peter Bennett
>
> On 8/6/2010 1:56 PM, Matthias Mayrock wrote:
>>  Hi There,
>>
>> Sorry I ask this dumb question but the unchronization,
>> to get it right, when writing v2.0-2.4, works like this:
>>
>> 1) Write frame data
>> 2) Insert unsynchronization zeros into frame data
>> 3) Take new frame data length and put into frame header
>>
>> So the frame header contains the size of frame content
>> after inserted zeros, right?
>>
>> Thanks for any answer and best wishes,
>>
>> matthias mayrock
>>
>>
>>
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