Module: Mediainfo::AttrReaders

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

Instance Method Summary collapse

Instance Method Details

#mediainfo_attr_reader(method_name, mediainfo_key = nil) ⇒ Object 



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

def mediainfo_attr_reader(method_name, mediainfo_key = nil)
  # NOTE explicit self necessary here until we rename local var 'name'
  stream_class_type = name[/::([^:]+)Stream$/, 1]
  
  before_type_cast_method_name = "#{method_name}_before_type_cast"
  mediainfo_key = mediainfo_key.gsub(/\W+/, "_").downcase if mediainfo_key
  
  if m = stream_class_type.match(/^#{Regexp.union *Mediainfo::NON_GENERAL_SECTIONS.map { |x| x.to_s.capitalize }}$/)
    k1 = stream_class_type.downcase.to_sym
  else
    k1 = :general
  end
  
  define_method before_type_cast_method_name do
    if v = instance_variable_get("@#{before_type_cast_method_name}")
      v
    else
      k2 = mediainfo_key ? mediainfo_key : method_name.to_s
      v = @parsed_response[k1][k2]
      
      instance_variable_set "@#{before_type_cast_method_name}", v
      instance_variable_get "@#{before_type_cast_method_name}"
    end
  end
  
  define_method method_name do
    if v = instance_variable_get("@#{method_name}")
      v
    else
      v = send(before_type_cast_method_name)
      v = yield v if v and block_given?
      
      instance_variable_set "@#{method_name}", v
      instance_variable_get "@#{method_name}"
    end
  end
  
  supported_attribute = method_name
  supported_attribute = "#{stream_class_type.downcase}_#{method_name}".to_sym unless k1 == :general
  Mediainfo.supported_attributes << supported_attribute
end

#mediainfo_date_reader(*a) ⇒ Object 



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# File 'lib/mediainfo/attr_readers.rb', line 67

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 48

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 71

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