Class: Attached::Processor::Audio

Inherits:
Base
  • Object
show all
Defined in:
lib/attached/processor/audio.rb

Instance Attribute Summary collapse

Attributes inherited from Base

#file, #options

Instance Method Summary collapse

Methods inherited from Base

process

Constructor Details

#initialize(file, options = {}, attachment = nil) ⇒ Audio

Create a processor.

Parameters:

  • file - The file to be processed.

  • options - The options to be applied to the processing.

  • attachment - The attachment the processor is being run for.



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# File 'lib/attached/processor/audio.rb', line 23

def initialize(file, options = {}, attachment = nil)
  super

  @path      = self.file.path

  @preset    = options[:preset]
  @extension = options[:extension]

  @extension ||= self.attachment.extension
end

Instance Attribute Details

#attachment ⇒ Object (readonly)

Returns the value of attribute attachment.



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# File 'lib/attached/processor/audio.rb', line 12

def attachment
  @attachment
end

#extension ⇒ Object (readonly)

Returns the value of attribute extension.



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# File 'lib/attached/processor/audio.rb', line 10

def extension
  @extension
end

#path ⇒ Object (readonly)

Returns the value of attribute path.



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# File 'lib/attached/processor/audio.rb', line 9

def path
  @path
end

#preset ⇒ Object (readonly)

Returns the value of attribute preset.



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# File 'lib/attached/processor/audio.rb', line 11

def preset
  @preset
end

Instance Method Details

#process ⇒ Object

Helper function for calling processors.

Usage:

self.process



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# File 'lib/attached/processor/audio.rb', line 48

def process

  result = Tempfile.new(["", self.extension])
  result.binmode

  begin

    parameters = []

    parameters << "--preset #{self.preset}" if self.preset

    parameters << self.path
    parameters << result.path

    parameters = parameters.join(" ").squeeze(" ")

    `lame #{parameters} #{redirect}`

    raise Errno::ENOENT if $?.exitstatus == 127

  rescue Errno::ENOENT
    raise "command 'lame' not found: ensure LAME is installed"
  end

  unless $?.exitstatus == 0
    raise Attached::Processor::Error, "must be an audio file"
  end

  return result

end

#redirect ⇒ Object

Redirect output path.



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# File 'lib/attached/processor/audio.rb', line 37

def redirect
  ">/dev/null 2>&1" if File.exist?("/dev/null")
end