Perl AVI datamosh 修正版

mosh.pl

open $f_in, '<', $ARGV[0];
read $f_in, my $buf, -s $ARGV[0];
my ( $movi, $idx1 ) = ( index( $buf, "movi" ), index( $buf, "idx1" ) );
my @frames =
  map { [ unpack( 'a4VVV', substr( $buf, $idx1 + 8 + $_ * 16, 16 ) ) ] }
  0 .. ( ( unpack( 'V', substr( $buf, $idx1 + 4, 4 ) ) / 16 ) - 1 );
my ( $movi_new, $idx1_new, $count ) = ( "movi", substr( $buf, $idx1, 8 ), 0 );
for (@frames) {
    my $offset = length $movi_new;
    if (@$_[0] =~ /00d./ && @$_[1] & 0x10 && $count != 0) {
        $movi_new .= @$_[0] . "\x00\x00\x00\x00";
        @$_[3] = "\x00\x00\x00\x00";
    }
    else {
        $count++ if @$_[0] =~ /00d./ && @$_[1] & 0x10;
        $movi_new .= substr( $buf, $movi + @$_[2], @$_[3] + 8 );
        $movi_new .= "\x00" if length($movi_new) % 2 == 1;
    }
    @$_[1] = "\x00\x00\x00\x00" if @$_[0] =~ /00d./ && @$_[1] & 0x10;
    @$_[2] = $offset;
    $idx1_new .= pack( 'a4VVV', @$_ );
}
my $size = $movi + (length $movi_new) + (length $idx1_new) - 8;
substr($buf, 4, 4, pack('V', $size));
substr($buf, $movi - 4, 4, pack('V', length $movi_new));

open $f_out, '>', $ARGV[1];
print $f_out substr( $buf, 0, $movi ) . $movi_new . $idx1_new;