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|
#!/usr/bin/perl -w
# Key detection. Uses libsndfile + its perl bindings, vamp-plugin-sdk,
# qm-vamp-plugins, and mplayer (for decoding mp3 files, since sndfile
# doesn't)
# Output is the output from the qm-keydetector plugin (with its key numbers
# converted to key names), followed by a list of all keys detected, sorted
# descending by the amount of the song that was in that key.
# The user is expected to understand what relative keys are: if 70% of the song
# is in G and 30% is in E minor (same actual key, relative minor), it's up to
# the user to listen to the song and decide whether it sounds more major or minor.
# 20140107 bkw: hack to add support for anything SndFile can't read, by
# using mplayer to convert to tmp.wav
use Audio::SndFile;
our @keynames = split /\s/, 'none C Db D Eb E F F# G Ab A Bb B Cm C#m Dm Ebm Em Fm F#m Gm G#m Am Bbm Bm none';
our %relative_majors = (
'Cm' => 'Eb',
'C#m' => 'E',
'Dm' => 'F',
'Ebm' => 'F#',
'Em' => 'G',
'Fm' => 'Ab',
'F#m' => 'A',
'Gm' => 'Bb',
'G#m' => 'B',
'Am' => 'C',
'Bbm' => 'Db',
'Bm' => 'D',
);
our %relative_minors = (
'Eb' => 'Cm',
'E' => 'C#m',
'F' => 'Dm',
'F#' => 'Ebm',
'G' => 'Em',
'Ab' => 'Fm',
'A' => 'F#m',
'Bb' => 'Gm',
'B' => 'G#m',
'C' => 'Am',
'Db' => 'Bbm',
'D' => 'Bm',
);
if(!@ARGV || $ARGV[0] =~ /^--?h(elp)?/) {
print <<EOF;
$0: Find key of music in audio (or maybe video) files.
Usage: $0 [-m|-M] file.wav [file.wav ...]
-q: Quiet, only output the most likely key.
-m: Force major keys to relative minor.
-M: Force minor keys to relative major.
EOF
exit 0;
}
for(@ARGV) {
if(/^-M/) {
$fold_major = 1;
$fold_minor = 0;
next;
} elsif(/^-m/) {
$fold_major = 0;
$fold_minor = 1;
next;
} elsif(/^-q/) {
$quiet++;
next;
}
my $sec;
{
my $sf;
eval {
$sf = Audio::SndFile->open("<", $_);
};
if($@) {
my $rq = $quiet ? "-really-quiet" : "";
warn "Extracting to tmp.wav\n" unless $quiet;
system("mplayer $rq -vo null -ao pcm:fast:file=tmp.wav \"$_\"");
$sf = Audio::SndFile->open("<", "tmp.wav");
$_ = "tmp.wav";
}
$sec = ($sf->frames) * (1 / $sf->samplerate);
}
printf "file is %03.2f sec\n", $sec unless $quiet;
my $oldstamp = -1;
my $oldkey = -1;
my $got = `vamp-simple-host qm-vamp-plugins:qm-keydetector "$_" 2 2>/dev/null`;
die "Analysis failed\n" unless defined $got;
print "\n" unless $quiet;
my @got = split "\n", $got;
## for my $line (@got) {
## my ($pre, $post) = split(/:/, $line);
## my $gotkey = $keynames[$post];
## my $gotrel;
## if($gotkey =~ /m$/) {
## $gotrel = get_relative_major($gotkey);
## } else {
## $gotrel = get_relative_minor($gotkey);
## }
## $line =~ s/:\s(\d+)\s*/": $gotkey ($gotrel)"/e;
## print $line . "\n";
## }
for(@got) {
my ($key, $relkey);
s/^\s*//;
s/\s*$//;
my ($stamp, $keynum) = split /: /, $_;
$keynum =~ s/\s.*//;
$key = $keynames[$keynum];
if($fold_major) {
$key = get_relative_major($key);
} elsif($fold_minor) {
$key = get_relative_minor($key);
}
$relkey = get_relative_key($key);
if($oldstamp != -1) {
$times{$oldkey} += ($stamp - $oldstamp);
}
$oldstamp = $stamp;
$oldkey = $key;
print "$stamp: $key ($relkey)\n" unless $quiet;
}
$times{$oldkey} += ($sec - $oldstamp);
print "\n" unless $quiet;
my @sorted = sort { $times{$b} <=> $times{$a} } keys %times;
if($quiet) {
print $sorted[0] . " (" . get_relative_key($sorted[0]) . ")\n";
} else {
for(@sorted) {
printf "%3s: %4.2f sec, %4.2f%%\n", $_, $times{$_}, $times{$_} / $sec * 100;
}
}
}
sub get_relative_major {
my $key = shift || die "missing key";
return $relative_majors{$key} || $key;
}
sub get_relative_minor {
my $key = shift || die "missing key";
return $relative_minors{$key} || $key;
}
sub get_relative_key {
my $key = shift || die "missing key";
if($key =~ /m$/) {
$relkey = get_relative_major($key);
} else {
$relkey = get_relative_minor($key);
}
return $relkey;
}
__END__
Output of plugin:
- Estimated key (from C major = 1 to B major = 12 and C minor = 13 to B minor = 24)
Looks like:
0.000000000: 23
54.984852607: 16
59.443083900: 4
71.331700680: 16
78.019047619: 18
78.762086167: 23
95.108934240: 18
97.338049886: 4
110.712743764: 9
112.198820861: 23
210.279909297: 18
215.481179138: 4
216.967256235: 18
222.168526077: 11
231.084988662: 4
234.057142857: 2
|
