[ID3 Dev] How do you know ID3 v1 without ID3v2

[hongyang]

Yes, you have my idea.

I am also confused about that.

garbage data would be start like "00 00 00 00 "chars and so on some "sync"
 pattern. but I am not confirm this.


Jim 写道:
> I might be confused but I think what he is asking is if a MP3 file that
> does not have an ID3v2 tag could somehow start with the characters "ID3".
>
> Or another way to say it is could there be "ID3" at the start of a MP3
> file but it is not a ID3v2 tag?
>
> I don't think this would happen but I also think that garbage data can
> sometimes appear at the beginning of an MP3 file.  So I don't think it
> is impossible.  I think that's why some players search for a certain
> "sync" pattern to identify the start of the real data.  Can someone
> confirm this?  (Or am I completely off on this?)
>
> Jim
>
>
>
>
> Jud White wrote:
>   
>> No, frame headers would never start with ID3.
>>
>> hongyang wrote:
>>     
>>> Thanks,
>>>
>>> I think maybe you misunderstand me, I mean whether the situation could
>>> happen, the MP3 music media data(not the Tag frame data) start with
>>> "ID3", but this "ID3" is not the ID3v2 Tag's identifier.
>>>
>>> In fact the MP3 file without ID3v2 Tags, only ID3v1 exist.
>>>
>>> do you think this situation would like happen.
>>>
>>> thank u again...
>>>
>>> Jud White 写道:
>>>       
>>>> An ID3v2 tag can be detected with the following pattern:
>>>> $49 44 33 yy yy xx zz zz zz zz
>>>> Where yy is less than $FF, xx is the 'flags' byte and zz is less than $80.
>>>>
>>>> http://id3.org/id3v2.3.0#head-697d09c50ed7fa96fb66c6b0a9d93585e2652b0b
>>>>
>>>>
>>>> hongyang wrote:
>>>>   
>>>>         
>>>>> Hello everyone,
>>>>>
>>>>> I have a quesetion, if I know the .mp3 file has ID3v1 Tag, and I am not
>>>>> sure whether it also has ID3v2 Tag.Now whether the condition would happend
>>>>> that the start of media data are "ID3" ,but the "ID3" is not the
>>>>> identifier of ID3v2.
>>>>>
>>>>> My english is very poor,so please forgave me.
>>>>>
>>>>> Thank you all.
>>>>>
>>>>> hongyang
>>>>>
>>>>>
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>>>>>   
>>>>>     
>>>>>           
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>>>>
>>>>   
>>>>         
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>>
>>
>>     
>
>
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