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#!/usr/bin/perl
use strict;
use Getopt::Std;
our $opt_c; # DON'T normalize the file
our $opt_j; # jitter the pitch of each subsample by N 1/100th semitones rather than repitching big chunks
getopts('cj:');
print "<<<< DATASET >>>>\n";
my $fmt = <<FMT;
Input File : '01_snapping_clean.wav'
Channels : 1
Sample Rate : 44100
Precision : 16-bit
Duration : 00:03:09.35 = 8350438 samples = 14201.4 CDDA sectors
File Size : 16.7M
Bit Rate : 706k
Sample Encoding: 16-bit Signed Integer PCM
FMT
sub process($) {
my $filename = shift or die "Usage: $0 [...filenames]\n";
my ($name, $ext) = split(/\./, $filename, 2);
if ($ext !~ /(wav|mp3|aiff?|flac)/) {
print "not a valid file extension: $ext\n";
return;
}
if ($ext eq 'mp3') {
print "Converting mp3 to wav\n";
system('ffmpeg', '-y', '-hide_banner', '-loglevel', 'error', '-i', $filename, $name . '.wav');
$filename = $name . '.wav';
}
my $soxi = `soxi $filename`;
my @lines = split("\n", $soxi);
print $soxi;
my $seconds;
for my $line (@lines) {
if ($line =~ /Duration : (\d\d):(\d\d):(\d\d)\./) {
my $h = $1;
my $m = $2;
my $s = $3;
$seconds = (((($h * 60) + $m) * 60) + $s) + 0;
}
}
print "Seconds: $seconds\n";
my $a_tmp = "a_" . $filename;
my $b_tmp = "b_" . $filename;
if (!$opt_c) {
print "Normalizing...";
system("sox", "-v", 0.945, $filename, $a_tmp);
} else {
$a_tmp = $filename;
}
# jitter mide: make copies of the original file and join together,
# split into chunks, and then pitchshift the chunks.
if ($opt_j) {
my $copies = 4080 / $seconds;
print "Copies to make: $copies\n";
print "\n";
for (my $i = 0; $i < $copies; $i++) {
system('cp', $a_tmp, sprintf("tmp_%d.wav", $i));
}
system 'sox', glob('tmp_*'), $b_tmp;
system 'rm', glob 'tmp_*';
system './split44k.sh', $b_tmp, 8, $name;
print "pitchshifting...\n";
my $i = 0;
opendir my $dh, $name or die "cant opendir $name: $!";
while (readdir $dh) {
next if /^\./;
print "$i...\n" if ++$i % 100 == 0;
my $fn = $_;
my $in_fn = $name . '/' . $fn;
my $out_fn = $name . '/z_' . $fn;
my $n = int rand( 2 * $opt_j ) - $opt_j;
system 'sox', $in_fn, $out_fn, 'pitch', $n;
my $rep = `soxi $name/z_$fn`;
if ($rep =~ /352800/) {
unlink $in_fn;
} else {
unlink $out_fn;
}
}
closedir $dh;
}
# standard mode: make a bunch of copies and then join them together,
# then subdivide into 8s chunks
else {
my $scale = sprintf("%.09f", 5e-7 * $seconds);
print "Scale factor: $scale\n";
print "\n";
system("./spread.sh", $a_tmp, $b_tmp, 0.999, $scale, 1.001);
system("./split44k.sh", $b_tmp, 8, $name);
}
if (!$opt_c) {
system("/bin/rm", $a_tmp);
}
system("/bin/rm", $b_tmp);
}
foreach my $file (@ARGV) {
print $file . "\n";
if ( -e $file ) {
process($file);
}
}
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