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|
#!/usr/bin/perl
use Data::Dumper;
use Cwd;
our $DEBUG = 1;
our $MIDICSV_BIN = Cwd::abs_path("midicsv-1.1/midicsv");
our $CSVMIDI_BIN = Cwd::abs_path("midicsv-1.1/csvmidi");
our $CHANNEL_EVENTS = [
'Note_on_c', 'Note_off_c', 'Pitch_bend_c', 'Control_c',
'Program_c', 'Channel_aftertouch_c', 'Poly_aftertouch_c',
];
our $SYSEX_EVENTS = [
'System_exclusive', 'System_exclusive_packet'
];
sub usage{
print STDERR sprintf('$>%s midifile [output_dir]'."\n", $0);
exit 1;
}
sub error{
my $msg = shift;
print STDERR $msg . "\n";
exit(1);
}
sub warn_sysex_found{
my $event = shift;
my $warning = sprintf("Sysex event found on channel %s\n", $event->{channel});
print STDERR $warning;
}
sub correct_bad_note_ons{
my $event = shift;
if ($event->{type} =~ /Note_on/i && $event->{data}->[-1] == 0) {
$event->{type} = "Note_off_c";
$event->{data}->[2] =~ s/on/off/i;
}
return $event;
}
sub file_to_list{
my $file = shift;
my $total_channels = shift;
my $csvdata = `$MIDICSV_BIN $file`;
my $list = [
map {
chomp($_);
my $ctx = {};
my $line = [ split(',', $_ ) ];
$ctx->{data} = $line;
$ctx->{type} = $line->[2];
if (grep { $ctx->{type} =~ /$_/i } @$CHANNEL_EVENTS ){
$ctx->{channel} = ($line->[3] =~ m/([0-9]+)/g)[0];
if (!(grep { $ctx->{channel} == $_ } @$total_channels )){
push(@$total_channels, $ctx->{channel});
}
}
# [ @line ];
$ctx;
} split('\n', $csvdata) ];
return $list;
}
sub add_to_all_outputs{
my $event = shift;
my $output_files = shift;
foreach my $events (values %$output_files){
push (@$events, join(',' , @{$event->{data}}));
};
}
sub add_to_single_output{
my $event = shift;
my $output_files = shift;
push(@{$output_files->{$event->{channel}}}, join(',', @{$event->{data}}));
}
sub process_event_list{
my $event_list = shift;
my $total_channels = shift;
my $output_data = {};
if ($event_list->[0]->{type} !~ /header/i){
error("Bad header");
}
#marker header as type0
$event_list->[0]->{data}->[3] =~ s/[0-9]+/0/g;
#check if file has more than one track/composition
my $tracks_count = $header->{data}->[4];
if ($tracks_count > 1){
error("Multiple tracks in same file, not yet implemented.");
}
foreach my $channel(@$total_channels){
$output_data->{$channel} = [];
}
#main loop
foreach $event(@$event_list){
if ( grep { $event->{type} =~ /$_/i } @$CHANNEL_EVENTS ){
$event = correct_bad_note_ons($event);
add_to_single_output( $event, $output_data );
}
elsif ( grep { $event->{type} =~ /$_/i} @$SYSEX_EVENTS ){
#consider adding special handle for sysex events
#currently just ignores them
warn_sysex_found ($event);
}
else {
add_to_all_outputs( $event, $output_data);
}
};
return $output_data;
}
sub data_to_files{
my $output_data = shift;
my $filename_prefix = shift;
foreach my $channel (keys %$output_data){
my $midi_filename = sprintf("%s-%s.mid", $filename_prefix, $channel);
my $csv_filename = sprintf("/tmp/%s-%s.csv", $filename_prefix, $channel);
open F, ">$csv_filename" or die $!;
print F (join("\n", @{$output_data->{$channel}}));
close(F);
system("$CSVMIDI_BIN $csv_filename $midi_filename");
unlink($csv_filename);
}
}
sub main{
if (scalar(@ARGV) < 1){
if ($DEBUG){
print STDERR "DEBUG: using example.mid as default midifile\n";
}else{
usage;
}
}
my $file = $ARGV[0] || "example.mid";
my $output_dir = $ARGV[2] || "./";
our $total_channels = [];
our $filename_prefix = $output_dir . ($file =~ m/^(.+)\./g)[0];
my $event_list = file_to_list ($file, $total_channels);
my $output_data = process_event_list ($event_list, $total_channels);
data_to_files($output_data, $filename_prefix);
#
};
main;
|
