Created
August 29, 2013 14:18
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Demonstration of the defunct 4ML language. This script converts the 4ML XML markup into actual MIDI events.
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use strict; | |
use warnings; | |
use MIDI; | |
use XML::Simple; | |
my $xml = XMLin(\*DATA); | |
my $song = $xml->{SONG}; | |
my @note = @{ $song->{NOTE} }; | |
my $title = $song->{title} || 'unknown'; | |
my $author = $song->{author} || 'unknown'; | |
my (@event, $pitch, $duration, $velocity, $instrument); | |
for my $note (@note) { | |
# check for patch changes | |
if (exists $note->{instrument}) { | |
$instrument = $MIDI::patch2number{$note->{instrument}} || 1; | |
push @event,[patch_change => 0, 1, $instrument]; | |
} | |
$pitch = scrub_pitch($note->{pitch},$pitch); | |
$duration = ($note->{duration} || 1) * 96; | |
$velocity = ($pitch eq 'rest') ? 0 : 96; # hacked silence | |
# add note_on/note_off pair | |
push @event,[note_on => 0,1,$MIDI::note2number{$pitch},$velocity]; | |
push @event,[note_off => $duration,1,$MIDI::note2number{$pitch},0]; | |
} | |
my $opus = MIDI::Opus->new({ | |
format => 0, | |
ticks => $song->{bpm}, | |
tracks => [ MIDI::Track->new({ | |
events => [ | |
[text_event => 0, "Title: $title"], | |
[text_event => 0, "Auhtor: $author"], | |
@event, | |
] | |
})], | |
}); | |
$opus->write_to_file($song->{name}.'.mid'); | |
# this transforms C into C4 and C:5 into C5 (etc.) | |
sub scrub_pitch { | |
my ($next,$prev) = @_; | |
return $prev unless $next; | |
my ($note,$octave) = split(':',$next,2); | |
return $note if lc($note) eq 'rest'; | |
$octave ||= 4; | |
return "$note$octave"; | |
} | |
__DATA__ | |
<?xml version="1.0" standalone="no"?> | |
<!DOCTYPE OPUS SYSTEM "http://4ml.org/4ml.dtd"> | |
<OPUS> | |
<SONG name="mary" title="Mary Had a Little Lamb" bpm="160"> | |
<!-- Define the notes here --> | |
<NOTE pitch="E:5" /> | |
<NOTE pitch="D:5" /> | |
<NOTE pitch="C:5" /> | |
<NOTE pitch="D:5" /> | |
<NOTE pitch="E:5" /> | |
<NOTE /> | |
<NOTE /> | |
<NOTE pitch="rest" /> | |
<NOTE pitch="D:3" instrument="Harpsichord" /> | |
<NOTE /> | |
<NOTE /> | |
<NOTE pitch="rest" /> | |
<NOTE pitch="E:3" /> | |
<NOTE pitch="G:3" /> | |
<NOTE /> | |
<NOTE pitch="rest" /> | |
<NOTE pitch="E" instrument="Sitar" /> | |
<NOTE pitch="D" /> | |
<NOTE pitch="C" /> | |
<NOTE pitch="D" /> | |
<NOTE pitch="E" /> | |
<NOTE /> | |
<NOTE /> | |
<NOTE /> | |
<NOTE pitch="D" instrument="Bagpipe" /> | |
<NOTE /> | |
<NOTE pitch="E" /> | |
<NOTE pitch="D" /> | |
<NOTE pitch="C:3" duration="4" instrument="Church Organ" /> | |
</SONG> | |
</OPUS> |
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