Module: Mediainfo::AttrReaders

Included in:
Mediainfo
Defined in:
lib/mediainfo/attr_readers.rb

Instance Method Summary collapse

Instance Method Details

#mediainfo_attr_reader(name, mediainfo_key = nil) ⇒ Object 



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# File 'lib/mediainfo/attr_readers.rb', line 10

def mediainfo_attr_reader(name, mediainfo_key = nil)
  supported_attributes << name
  attr_name = "#{name}_before_type_cast"
  mediainfo_key = mediainfo_key.gsub(/\W+/, "_").downcase if mediainfo_key
  
  define_method attr_name do
    if v = instance_variable_get("@#{attr_name}")
      v
    else
      v = if md = name.to_s.match(/^(#{SECTIONS.map { |x| x.underscore } * "|"})_(.+)$/)
        k = mediainfo_key ? mediainfo_key : md[2]
        if subsection = @parsed_response[md[1]]
          subsection[k]
        end
      else
        k = mediainfo_key ? mediainfo_key : name.to_s
        @parsed_response[k]
      end
      
      instance_variable_set "@#{attr_name}", v
      v
    end
  end
  
  define_method name do
    if v = instance_variable_get("@#{name}")
      v
    else
      v = send "#{name}_before_type_cast"
      v = yield v if v and block_given?
      
      instance_variable_set "@#{name}", v
      v
    end
  end
end

#mediainfo_date_reader(*a) ⇒ Object 



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# File 'lib/mediainfo/attr_readers.rb', line 66

def mediainfo_date_reader(*a)
  mediainfo_attr_reader(*a) { |v| Time.parse v }
end

#mediainfo_duration_reader(*a) ⇒ Object 



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# File 'lib/mediainfo/attr_readers.rb', line 47

def mediainfo_duration_reader(*a)
  mediainfo_attr_reader *a do |v|
    t = 0
    v.split(/\s+/).each do |tf|
      case tf
      # XXX haven't actually seen hot they represent hours yet 
      # but hopefully this is ok.. :\
      when /\d+h/  then t += tf.to_i * 60 * 60 * 1000
      when /\d+mn/ then t += tf.to_i * 60 * 1000
      when /\d+ms/ then t += tf.to_i
      when /\d+s/  then t += tf.to_i * 1000
      else
        raise "unexpected time fragment! please report bug!"
      end
    end
    t
  end
end

#mediainfo_int_reader(*a) ⇒ Object 



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# File 'lib/mediainfo/attr_readers.rb', line 70

def mediainfo_int_reader(*a)
  mediainfo_attr_reader(*a) { |v| v.gsub(/\D+/, "").to_i }
end

#mediainfo_section_query(name) ⇒ Object 



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# File 'lib/mediainfo/attr_readers.rb', line 74

def mediainfo_section_query(name)
  define_method("#{name}?") { @parsed_response.key? name.to_s }
end

#supported_attributes ⇒ Object 



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# File 'lib/mediainfo/attr_readers.rb', line 6

def supported_attributes
  @supported_attributes ||= []
end