Class: WaveToJson::Audio

Inherits:
Object
  • Object
show all
Defined in:
lib/wave_to_json/audio.rb

Constant Summary collapse

MAX_VALUE = 
2**16
MIN_VALUE = 
-(2**16)

Instance Method Summary collapse

Constructor Details

#initialize(audio_path) ⇒ Audio

Returns a new instance of Audio.



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# File 'lib/wave_to_json/audio.rb', line 6

def initialize(audio_path)
  @path = audio_path
end

Instance Method Details

#duration ⇒ Object 



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# File 'lib/wave_to_json/audio.rb', line 10

def duration
  return @duration if @duration
  @duration = ShellCommand.new(['soxi', '-D', @path]).run_and_return_output_if_success.to_f
end

#generate_raw_file(raw_file_path, options = {}) ⇒ Object 



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# File 'lib/wave_to_json/audio.rb', line 31

def generate_raw_file(raw_file_path, options={})
  command = [ 'sox', @path, '-t', 'raw', '-r', '44100', '-c', '1', '-e', 'signed-integer', '-L', raw_file_path ]
  if options[:channel] == :left
    command.concat(%w(remix 1 1))
  elsif options[:channel] == :right
    command.concat(%w(remix 2 2))
  end

  ShellCommand.new(command).execute
end

#number_of_channels ⇒ Object 



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# File 'lib/wave_to_json/audio.rb', line 15

def number_of_channels
  return @number_of_channels if @number_of_channels
  @number_of_channels = ShellCommand.new(['soxi', '-c', @path]).run_and_return_output_if_success.to_i
end

#raw_data(options = {}) ⇒ Object 



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# File 'lib/wave_to_json/audio.rb', line 20

def raw_data(options = {})
  command = [ 'sox', @path, '-t', 'raw', '-r', '44100', '-c', '1', '-e', 'signed-integer', '-L', '-' ]
  if options[:channel] == :left
    command.concat(%w(remix 1 1))
  elsif options[:channel] == :right
    command.concat(%w(remix 2 2))
  end

  ShellCommand.new(command).run_and_return_output_if_success.unpack('l*')
end