Re: RE: RE: File identifier

Useful Script.  
How did you know to use:
"\xFF\xF0-\xFF"
for identifying MP3 files?

I have tried unpack and sprintf, but I'm guessing I'm using those funcions wrong.

Comment on Re: RE: RE: File identifier

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Re: Re: RE: RE: File identifier by Corion (Patriarch) on Sep 07, 2003 at 20:04 UTC
The sequence of 12 "one" bits, starting at a byte boundary, is what the MPEG audio layer 3 spec says :-) See http://www.euronet.nl/~soloh/mpegEnc/textfiles/mpeg-AFS.txt for example, I didn't come up with a better thing in the minute I searched Google ;-) `perl -MHTTP::Daemon -MHTTP::Response -MLWP::Simple -e ' ; # The $d = new HTTP::Daemon and fork and getprint $d->url and exit;#spider ($c = $d->accept())->get_request(); $c->send_response( new #in the HTTP::Response(200,$_,$_,qq(Just another Perl hacker\n))); ' # web` [download]	[reply] [d/l]

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Re: Re: RE: RE: File identifier
by Corion (Patriarch) on Sep 07, 2003 at 20:04 UTC

The sequence of 12 "one" bits, starting at a byte boundary, is what the MPEG audio layer 3 spec says :-) See http://www.euronet.nl/~soloh/mpegEnc/textfiles/mpeg-AFS.txt for example, I didn't come up with a better thing in the minute I searched Google ;-)

perl -MHTTP::Daemon -MHTTP::Response -MLWP::Simple -e ' ;    # The  
$d = new HTTP::Daemon and fork and getprint $d->url and exit;#spider
($c = $d->accept())->get_request(); $c->send_response( new   #in the
HTTP::Response(200,$_,$_,qq(Just another Perl hacker\n))); ' #  web
[download]

[reply]
[d/l]