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thanks, Jim<br>
<br>
I think that is to say the garbage data whould be not start with <br>
<pre wrap="">$49 44 33 yy yy xx zz zz zz zz
is it true?
</pre>
<br>
Jim дµÀ:
<blockquote cite="mid:46907ADE.7040500@comcast.net" type="cite">
<pre wrap="">If the header for the tag was properly written, you can check it using
the pattern that Jud gave before:
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.
So, if the first 3 characters are "ID3", then check that the next two
(yy) are less than $FF and that the last four (zz) are less than $80.
hongyang wrote:
</pre>
<blockquote type="cite">
<pre wrap="">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 дµÀ:
</pre>
<blockquote type="cite">
<pre wrap="">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:
</pre>
<blockquote type="cite">
<pre wrap="">No, frame headers would never start with ID3.
hongyang wrote:
</pre>
<blockquote type="cite">
<pre wrap="">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 дµÀ:
</pre>
<blockquote type="cite">
<pre wrap="">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.
<a class="moz-txt-link-freetext" href="http://id3.org/id3v2.3.0#head-697d09c50ed7fa96fb66c6b0a9d93585e2652b0b">http://id3.org/id3v2.3.0#head-697d09c50ed7fa96fb66c6b0a9d93585e2652b0b</a>
hongyang wrote:
</pre>
<blockquote type="cite">
<pre wrap="">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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