Contents

require 'attached/processor/base'
require 'attached/processor/error'

module Attached
  module Processor
    class Audio < Base

      attr_reader :path
      attr_reader :extension
      attr_reader :preset
      attr_reader :attachment

      # 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.

      def initialize(file, options = {}, attachment = nil)
        super
        @path      = self.file.path
        @preset    = options[:preset]
        @extension = options[:extension]
        @extension ||= self.attachment.extension
      end

      # Redirect output path.

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

      # Helper function for calling processors.
      #
      # Usage:
      #
      #   self.process

      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

    end
  end
end

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
attached-1.0.7	lib/attached/processor/audio.rb
attached-1.0.6	lib/attached/processor/audio.rb
attached-1.0.5	lib/attached/processor/audio.rb