misc/tools/midichannels.pl

   1 #!/usr/bin/perl
   2
   3 use strict;
   4 use warnings;
   5 use MIDI;
   6 use MIDI::Opus;
   7
   8 my ($filename, @others) = @ARGV;
   9 my $opus = MIDI::Opus->new({from_file => $filename});
  10
  11 my %chanpos = (
  12         note_off => 2,
  13         note_on => 2,
  14         key_after_touch => 2,
  15         control_change => 2,
  16         patch_change => 2,
  17         channel_after_touch => 2,
  18         pitch_wheel_change => 2
  19 );
  20
  21 my %isclean = (
  22         set_tempo => sub { 1; },
  23         note_off => sub { 1; },
  24         note_on => sub { 1; },
  25         control_change => sub { $_[3] == 64; },
  26 );
  27
  28 sub abstime(@)
  29 {
  30         my $t = 0;
  31         return map { [$_->[0], $t += $_->[1], @{$_}[2..(@$_-1)]]; } @_;
  32 }
  33
  34 sub reltime(@)
  35 {
  36         my $t = 0;
  37         return map { my $tsave = $t; $t = $_->[1]; [$_->[0], $t - $tsave, @{$_}[2..(@$_-1)]]; } @_;
  38 }
  39
  40 sub clean(@)
  41 {
  42         return reltime grep { ($isclean{$_->[0]} // sub { 0; })->(@$_) } abstime @_;
  43 }
  44
  45 for(@others)
  46 {
  47         my $opus2 = MIDI::Opus->new({from_file => $_});
  48         if($opus2->ticks() != $opus->ticks())
  49         {
  50                 my $tickfactor = $opus->ticks() / $opus2->ticks();
  51                 for($opus2->tracks())
  52                 {
  53                         $_->events(reltime map { $_->[1] = int($_->[1] * $tickfactor + 0.5); $_; } abstime $_->events());
  54                 }
  55         }
  56         $opus->tracks($opus->tracks(), $opus2->tracks());
  57 }
  58
  59 while(<STDIN>)
  60 {
  61         chomp;
  62         my @arg = split /\s+/, $_;
  63         my $cmd = shift @arg;
  64         print "Executing: $cmd @arg\n";
  65         if($cmd eq 'clean')
  66         {
  67                 my $tracks = $opus->tracks_r();
  68                 $tracks->[$_]->events_r([clean($tracks->[$_]->events())])
  69                         for 0..@$tracks-1;
  70         }
  71         elsif($cmd eq 'dump')
  72         {
  73                 print $opus->dump({ dump_tracks => 1 });
  74         }
  75         elsif($cmd eq 'ticks')
  76         {
  77                 if(@arg)
  78                 {
  79                         $opus->ticks($arg[0]);
  80                 }
  81                 else
  82                 {
  83                         print "Ticks: ", $opus->ticks(), "\n";
  84                 }
  85         }
  86         elsif($cmd eq 'tricks')
  87         {
  88                 print "haha, very funny\n";
  89         }
  90         elsif($cmd eq 'tracks')
  91         {
  92                 my $tracks = $opus->tracks_r();
  93                 if(@arg)
  94                 {
  95                         my %taken = ();
  96                         my @t = ();
  97                         my $force = 0;
  98                         for(@arg)
  99                         {
 100                                 if($_ eq '--force')
 101                                 {
 102                                         $force = 1;
 103                                         next;
 104                                 }
 105                                 next if $taken{$_}++ and not $force;
 106                                 push @t, $tracks->[$_];
 107                         }
 108                         $opus->tracks_r(\@t);
 109                 }
 110                 else
 111                 {
 112                         for(0..@$tracks-1)
 113                         {
 114                                 print "Track $_:";
 115                                 my $name = undef;
 116                                 my %channels = ();
 117                                 my $notes = 0;
 118                                 my %notehash = ();
 119                                 my $t = 0;
 120                                 my $events = 0;
 121                                 for($tracks->[$_]->events())
 122                                 {
 123                                         ++$events;
 124                                         $_->[0] = 'note_off' if $_->[0] eq 'note_on' and $_->[4] == 0;
 125                                         $t += $_->[1];
 126                                         my $p = $chanpos{$_->[0]};
 127                                         if(defined $p)
 128                                         {
 129                                                 my $c = $_->[$p] + 1;
 130                                                 ++$channels{$c};
 131                                         }
 132                                         ++$notes if $_->[0] eq 'note_on';
 133                                         $notehash{$_->[2]}{$_->[3]} = $t if $_->[0] eq 'note_on';
 134                                         $notehash{$_->[2]}{$_->[3]} = undef if $_->[0] eq 'note_off';
 135                                         $name = $_->[2] if $_->[0] eq 'track_name';
 136                                 }
 137                                 my $channels = join " ", sort keys %channels;
 138                                 my @stuck = ();
 139                                 while(my ($k1, $v1) = each %notehash)
 140                                 {
 141                                         while(my ($k2, $v2) = each %$v1)
 142                                         {
 143                                                 push @stuck, sprintf "%d:%d@%.1f%%", $k1+1, $k2, $v2 * 100.0 / $t
 144                                                         if defined $v2;
 145                                         }
 146                                 }
 147                                 print " $name" if defined $name;
 148                                 print " (channel $channels)" if $channels ne "";
 149                                 print " ($events events)" if $events;
 150                                 print " ($notes notes)" if $notes;
 151                                 print " (notes @stuck stuck)" if @stuck;
 152                                 print "\n";
 153                         }
 154                 }
 155         }
 156         elsif($cmd eq 'save')
 157         {
 158                 $opus->write_to_file($arg[0]);
 159         }
 160         else
 161         {
 162                 print "Unknown command, allowed commands: ticks, tracks, clean, save\n";
 163         }
 164         print "Done with: $cmd @arg\n";
 165 }