Created
January 6, 2012 18:10
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#!/usr/bin/env perl | |
use strict; | |
use warnings; | |
open(my $fh, "<", $ARGV[0]) or die $!; | |
parse_mp4($fh, -s $fh); | |
exit 0; | |
sub parse_mp4 { | |
my ($fh, $len, $line) = @_; | |
$line = "$line "; | |
my $so_far = 0; | |
while ($so_far < $len) { | |
my $offset = sysseek($fh, 0, 1); | |
sysread($fh, my $size, 4)==4 or die $!; | |
sysread($fh, my $type, 4)==4 or die $!; | |
$size = unpack("N", $size); | |
print "$line Type: $type, size = $size, offset=$offset, offset mod 8=".($offset % 8)."\n"; | |
if ($type =~ /^(?:moov|udta|trak|mdia|minf|stbl)$/) { | |
parse_mp4($fh, $size-8, $line); | |
} | |
else { | |
seek($fh, $size-8, 1) or die $!; | |
} | |
$so_far+=$size; | |
} | |
die "flown off eof" unless $so_far == $len; | |
} |
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