blob: 3a7569dc58a078cfd1ff2d8c072f0a54ca3469e9 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
|
# Copyright (C) 2013-2016 all contributors <dtas-all@nongnu.org>
# License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
# frozen_string_literal: true
require_relative '../process'
module DTAS::Source::Mp3gain # :nodoc:
include DTAS::Process
# we use dBFS = 1.0 as scale (not 32768)
def __mp3gain_peak(str)
sprintf("%0.8g", str.to_f / 32768.0)
end
# massage mp3gain(1) output
def mp3gain_comments
tmp = {}
case @infile
when String
@infile =~ /\.mp[g23]\z/in or return
qx(%W(mp3gain -s c #@infile)).split("\n").each do |line|
case line
when /^Recommended "(Track|Album)" dB change:\s*(\S+)/
tmp["REPLAYGAIN_#{$1.upcase}_GAIN"] = $2
when /^Max PCM sample at current gain: (\S+)/
tmp["REPLAYGAIN_TRACK_PEAK"] = __mp3gain_peak($1)
when /^Max Album PCM sample at current gain: (\S+)/
tmp["REPLAYGAIN_ALBUM_PEAK"] = __mp3gain_peak($1)
end
end
tmp
else
raise TypeError, "unsupported type: #{@infile.inspect}"
end
rescue => e
$DEBUG and
warn("mp3gain(#{@infile.inspect}) failed: #{e.message} (#{e.class})")
end
end
|