Class: Libis::Format::Converter::AudioConverter

Inherits:
Base
  • Object
show all
Defined in:
lib/libis/format/converter/audio_converter.rb

Instance Attribute Summary

Attributes inherited from Base

#flags, #options

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Base

#initialize, #using_temp

Constructor Details

This class inherits a constructor from Libis::Format::Converter::Base

Class Method Details

.input_types ⇒ Object 



13
14
15
 
# File 'lib/libis/format/converter/audio_converter.rb', line 13

def self.input_types
  %i[MP3 FLAC AC3 AAC WMA ALAC WAV AIFF AMR AU M4A]
end

.output_types(format = nil) ⇒ Object 



17
18
19
20
21
 
# File 'lib/libis/format/converter/audio_converter.rb', line 17

def self.output_types(format = nil)
  return [] unless input_types.include?(format)

  %i[MP3 FLAC AC3 AAC WMA ALAC WAV AIFF AMR AU M4A]
end

.sounds_like(file1, file2, threshold, rate, channels) ⇒ Object 



110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
 
# File 'lib/libis/format/converter/audio_converter.rb', line 110

def self.sounds_like(file1, file2, threshold, rate, channels)
  rate ||= 96_000
  channels ||= 2
  threshold ||= 0.85

  if File.exist?(file1) && File.exist?(file2)
    # Convert input files into raw 16-bit signed audio (WAV) to process with Chramaprint
    file1_raw = File.join('', 'tmp', "#{File.basename(file1)}.wav")
    file2_raw = File.join('', 'tmp', "#{File.basename(file2)}.wav")
    FileUtils.rm(file1_raw, force: true)
    FileUtils.rm(file2_raw, force: true)
    cvt_cmd = Libis::Format::Config[:raw_audio_convert_cmd]
    `#{format(cvt_cmd, file1, file1_raw, rate, channels)}`
    `#{format(cvt_cmd, file2, file2_raw, rate, channels)}`
    file1_audio = File.binread(file1_raw)
    file2_audio = File.binread(file2_raw)

    # Get audio fingerprints
    chromaprint = Chromaprint::Context.new(rate, channels, Chromaprint::ALGORITHM_TEST3)
    file1_fp = chromaprint.get_fingerprint(file1_audio)
    file2_fp = chromaprint.get_fingerprint(file2_audio)

    # Cleanup files
    FileUtils.rm(file1_raw, force: true)
    FileUtils.rm(file2_raw, force: true)

    # Compare fingerprints and compare result against threshold
    cmp = file1_fp.compare(file2_fp)
    # puts "Threshold[#{File.basename(exp_file)},#{File.basename(tgt_file)}: #{cmp}"
    cmp > threshold
  else
    false
  end
rescue Exception => e
  puts "Error comparing sound file #{file1} and #{file2}: #{e.message} @ #{e.backtrace.first}"
  false
end

Instance Method Details

#assemble_and_convert(sources, target) ⇒ Object 



98
99
100
101
102
103
104
105
106
107
108
 
# File 'lib/libis/format/converter/audio_converter.rb', line 98

def assemble_and_convert(sources, target)
  result = {}
  Tempfile.create(%w[list .txt]) do |f|
    sources.each { |src| f.puts src }
    opts[:global] ||= []
    opts[:global] += %w[-f concat]
    f.close
    result = convert_file(f.to_path, target)
  end
  result
end

#bit_rate(value) ⇒ Object 



47
48
49
 
# File 'lib/libis/format/converter/audio_converter.rb', line 47

def bit_rate(value)
  @options[:bit_rate] = value.to_s
end

#channels(value) ⇒ Object 



55
56
57
 
# File 'lib/libis/format/converter/audio_converter.rb', line 55

def channels(value)
  @options[:channels] = value.to_s
end

#codec(codec) ⇒ Object 



31
32
33
 
# File 'lib/libis/format/converter/audio_converter.rb', line 31

def codec(codec)
  @options[:codec] = codec
end

#convert(source, target, _format, opts = {}) ⇒ Object

def encoder(value) @options = value end

def encoder_options(value) @options = value end



77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
 
# File 'lib/libis/format/converter/audio_converter.rb', line 77

def convert(source, target, _format, opts = {})
  super

  FileUtils.mkpath(File.dirname(target))

  if source.is_a? Array

    assemble_and_convert(source, target)

  elsif File.directory?(source)

    sources = Dir[File.join(source, '**', '*')].reject { |p| File.directory? p }
    assemble_and_convert(sources, target)

  else

    convert_file(source, target)

  end
end

#duration(seconds) ⇒ Object 



39
40
41
 
# File 'lib/libis/format/converter/audio_converter.rb', line 39

def duration(seconds)
  @options[:duration] = seconds.to_s
end

#format(format) ⇒ Object 



27
28
29
 
# File 'lib/libis/format/converter/audio_converter.rb', line 27

def format(format)
  @options[:format] = format
end

#preset(stream, name) ⇒ Object 



65
66
67
 
# File 'lib/libis/format/converter/audio_converter.rb', line 65

def preset(stream, name)
  (@options[:preset] ||= {})[stream] = name
end

#quality(value) ⇒ Object 



43
44
45
 
# File 'lib/libis/format/converter/audio_converter.rb', line 43

def quality(value)
  @options[:quality] = value.to_s
end

#quiet(value) ⇒ Object 



23
24
25
 
# File 'lib/libis/format/converter/audio_converter.rb', line 23

def quiet(value)
  @flags[:quiet] = !!value
end

#sampling_freq(value) ⇒ Object 



51
52
53
 
# File 'lib/libis/format/converter/audio_converter.rb', line 51

def sampling_freq(value)
  @options[:sampling_freq] = value.to_s
end

#start(seconds) ⇒ Object 



35
36
37
 
# File 'lib/libis/format/converter/audio_converter.rb', line 35

def start(seconds)
  @options[:start] = seconds.to_s
end

#web_stream(value) ⇒ Object 



59
60
61
62
63
 
# File 'lib/libis/format/converter/audio_converter.rb', line 59

def web_stream(value)
  return unless value

  @options[:codec] = 'mp3'
end