File Coverage

blib/lib/Music/Duration.pm

Criterion	Covered	Total	%
statement	14	14	100.0
branch			n/a
condition			n/a
subroutine	6	6	100.0
pod	3	3	100.0
total	23	23	100.0

package Music::Duration;
our $AUTHORITY = 'cpan:GENE';

# ABSTRACT: Add 32nd, 64th, 128th and tuplet durations to MIDI-Perl

use strict;
use warnings;

use MIDI::Simple ();

our $VERSION = '0.0802';


{
    # Set the initial duration to one below 32nd,
    my $last = 's'; # ..which is a sixteenth.

    # Add 32nd, 64th and 128th as y, x, and o respectively.
    for my $duration ( qw( y x o ) ) {
        # Create a MIDI::Simple format note identifier.
        my $n = $duration . 'n';

        # Compute the note duration, which is half of the previous.
        $MIDI::Simple::Length{$n} = $MIDI::Simple::Length{ $last . 'n' } / 2;

        # Compute the dotted duration.
        $MIDI::Simple::Length{ 'd' . $n } = $MIDI::Simple::Length{$n}
            + $MIDI::Simple::Length{$n} / 2;

        # Compute the double-dotted duration.
        $MIDI::Simple::Length{ 'dd' . $n } = $MIDI::Simple::Length{ 'd' . $n }
            + $MIDI::Simple::Length{$n} / 4;

        # Compute the triplet duration.
        $MIDI::Simple::Length{ 't' . $n } = $MIDI::Simple::Length{$n} / 3 * 2;

        # Increment the last duration seen.
        $last = $duration;
    }
}


sub tuplet {
    my ( $duration, $name, $factor ) = @_;
    $MIDI::Simple::Length{ $name . $duration } = $MIDI::Simple::Length{$duration} / $factor
}

sub tuple { tuplet(@_) }


sub add_duration {
    my ( $name, $duration ) = @_;
    $MIDI::Simple::Length{ $name } = $duration;
}

1;

__END__