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

category, #check_file_exist, inherited, using_temp, #using_temp

Constructor Details

#initialize ⇒ AudioConverter

Returns a new instance of AudioConverter.



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# File 'lib/libis/format/converter/audio_converter.rb', line 22

def initialize
  super
end

Class Method Details

.input_types ⇒ Object 



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

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

.output_types(format = nil) ⇒ Object 



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# File 'lib/libis/format/converter/audio_converter.rb', line 17

def self.output_types(format = nil)
  return [] unless format.nil? || input_types.include?(format)
  [:MP3, :FLAC, :AC3, :AAC, :WMA, :ALAC, :WAV, :AIFF, :AMR, :AU, :M4A]
end

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



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# File 'lib/libis/format/converter/audio_converter.rb', line 81

def self.sounds_like(file1, file2, threshold, rate, channels)
  rate ||= 96000
  channels ||= 2
  threshold ||= 0.85

  if File.exists?(file1) && File.exists?(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]
    %x"#{cvt_cmd % [file1, file1_raw, rate, channels]}"
    %x"#{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
  error "Error comparing sound file #{file1} and #{file2}: #{e.message} @ #{e.backtrace.first}"
  false
end

Instance Method Details

#bit_rate(value) ⇒ Object 



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# File 'lib/libis/format/converter/audio_converter.rb', line 50

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

#channels(value) ⇒ Object 



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# File 'lib/libis/format/converter/audio_converter.rb', line 58

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

#codec(codec) ⇒ Object 



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# File 'lib/libis/format/converter/audio_converter.rb', line 34

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

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



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# File 'lib/libis/format/converter/audio_converter.rb', line 72

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

  FileUtils.mkpath(File.dirname(target))

  convert_file(source, target)

end

#duration(seconds) ⇒ Object 



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# File 'lib/libis/format/converter/audio_converter.rb', line 42

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

#format(format) ⇒ Object 



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# File 'lib/libis/format/converter/audio_converter.rb', line 30

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

#preset(stream, name) ⇒ Object 



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# File 'lib/libis/format/converter/audio_converter.rb', line 68

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

#quality(value) ⇒ Object 



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# File 'lib/libis/format/converter/audio_converter.rb', line 46

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

#quiet(v) ⇒ Object 



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# File 'lib/libis/format/converter/audio_converter.rb', line 26

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

#sampling_freq(value) ⇒ Object 



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# File 'lib/libis/format/converter/audio_converter.rb', line 54

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

#start(seconds) ⇒ Object 



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# File 'lib/libis/format/converter/audio_converter.rb', line 38

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

#web_stream(value) ⇒ Object 



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# File 'lib/libis/format/converter/audio_converter.rb', line 62

def web_stream(value)
  if value
    @options[:codec] = 'mp3'
  end
end