Class: EasyAudioUtils

Inherits:
Object
  • Object
show all
Extended by:
CommandHelper
Defined in:
lib/easyaudio_utils.rb

Instance Method Summary collapse

Methods included from CommandHelper

list, search

Constructor Details

#initialize(audio_in = nil, audio_out = 'audio.wav', out: audio_out, working_dir: '/tmp') ⇒ EasyAudioUtils

Returns a new instance of EasyAudioUtils.



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# File 'lib/easyaudio_utils.rb', line 60

def initialize(audio_in=nil, audio_out='audio.wav', out: audio_out, 
               working_dir: '/tmp')

  @file_in, @file_out, @working_dir = audio_in, out, working_dir

end

Instance Method Details

#capture(show: false) ⇒ Object Also known as: record

records audio in mono audio tested with .flac



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# File 'lib/easyaudio_utils.rb', line 70

def capture(show: false)

  command = "rec -c 1 -r 8000 -t alsa default #{@file_out} " + 
      "silence 1 0.1 5% 5 1.0 5%"
  run command, show

end

#concat_files(files = []) ⇒ Object Also known as: concat 



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# File 'lib/easyaudio_utils.rb', line 78

def concat_files(files=[])
  WavTool.new(out: @file_out, ).concat files
end

#convert ⇒ Object

convert either wav to ogg or ogg to wav



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# File 'lib/easyaudio_utils.rb', line 86

def convert()
      
  if File.extname(@file_in) == '.ogg' then
    ogg_to_wav() if File.extname(@file_out) == '.wav' 
  else
    wav_to_ogg() if File.extname(@file_out) == '.ogg' 
  end
  
end

#cut(starttime, duration) ⇒ Object

cut a section of audio and save it to file



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# File 'lib/easyaudio_utils.rb', line 98

def cut(starttime, duration)    
  
  command = "avconv -i %s -ss %s -t %s %s" % \
      [@file_in, starttime, duration, @file_out]
  run command, show    
  
end

#duration ⇒ Object 



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# File 'lib/easyaudio_utils.rb', line 106

def duration()
  
  case File.extname(@file_in)
  when '.ogg'
    OggInfo.open(@file_in).length
  when '.wav'
    WavTool.new().duration(@file_in)
  when '.mp3'
    Mp3Info.new(@file_in).length
  end    
  
end

#generate_silence(duration) ⇒ Object

silence duration in seconds



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# File 'lib/easyaudio_utils.rb', line 121

def generate_silence(duration)
  WavTool.new(out: @file_out).silence duration: duration
end

#play(show: false) ⇒ Object 



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# File 'lib/easyaudio_utils.rb', line 127

def play(show: false)
  command = "mplayer #{@file_out}"
  run command, show
end

#split(show: false) ⇒ Object

split by silence



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# File 'lib/easyaudio_utils.rb', line 134

def split(show: false)    
  command = "sox -V3 #{@file_in} #{@file_out} silence -l  0  " +
      " 1 0.5 0.1% : newfile : restart"
  run command, show
end

#youtube_dl(show: false) ⇒ Object

Download and extract audio from a video on YouTube

By default, Youtube-dl will save the audio in Ogg (opus) format.



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# File 'lib/easyaudio_utils.rb', line 144

def youtube_dl(show: false)    
  
  command = "youtube-dl -x #{url=@file_in}"
  command += ' -o ' + @file_out if @file_out
  run command, show    

end