Created
May 18, 2023 05:15
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#!/usr/bin/rakudo | |
use XML::XPath; | |
use TagLibC; | |
enum Format <MP3Gain>; | |
class Loudness { | |
has Real $.dbfs is readonly; | |
has Real $.db is readonly; | |
has Real $.amplitude is readonly; | |
} | |
class Measurement { | |
has Loudness $.integrated is readonly; | |
has Loudness $.momentary is readonly; | |
has Loudness $.shortterm-maximum is readonly; | |
has Loudness $.sample-peak is readonly; | |
has Loudness $.true-peak is readonly; | |
} | |
class Track { | |
has Measurement $.measurement is readonly; | |
has Str $.file is readonly; | |
} | |
sub lift_measurement(XML::Element $e) { | |
my $measurements = $e.nodes.map: -> $_ { | |
next unless $_ ~~ XML::Element; | |
next if .name eq 'track'; | |
(.name, Loudness.new(|<dbfs db amplitude>.map(-> $n {$n => .attribs{$n} if .attribs{$n}}).Map>>.Real)) | |
}; | |
Measurement.new(|$measurements.Map) | |
} | |
sub MAIN( | |
Bool :o(:$terse) = True, #= Terse output | |
Str :s(:$skiptag) = 's', #= mp3gain compat, ignored | |
Int :d(:$target) = 0, #= Reference level, modify suggested gain by level, mp3gain compat, ignored | |
Bool :k(:$noclip) = True, #= mp3gain compat, ignored presently | |
Bool :c(:$nowarn) = True, #= mp3gain compat, ingored presently | |
Format :f(:$format) = MP3Gain, #= output format | |
*@files # Files to process | |
) { | |
my $bs1770 = run(|<bs1770gain --replaygain --track-tags --album-tags --suppress-progress --xml -imstp -->, |@files, :out); | |
my $report = XML::XPath.new(xml => $bs1770.out.slurp: :close); | |
my $album = lift_measurement($report.find('/bs1770gain')); | |
my $tracks = $report.find('/bs1770gain/track').Array.map: -> $_ { | |
Track.new(file => .attribs<file>, measurement => lift_measurement($_)); | |
} | |
if ($format == MP3Gain) { | |
# peak = sample-peak.amplitude | |
# | |
} | |
} |
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