Class: MIDI::MetaEvent

Inherits:
Event
  • Object
show all
Defined in:
lib/midilib/event.rb

Direct Known Subclasses

KeySig, Marker, Tempo, TimeSig

Instance Attribute Summary collapse

Attributes inherited from Event

#delta_time, #print_channel_numbers_from_one, #print_decimal_numbers, #print_note_names, #status, #time_from_start

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Event

#<=>, #channel_to_s, #number_to_s, #quantize_to

Constructor Details

#initialize(meta_type, data = nil, delta_time = 0) ⇒ MetaEvent

Returns a new instance of MetaEvent.



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# File 'lib/midilib/event.rb', line 430

def initialize(meta_type, data = nil, delta_time = 0)
  super(META_EVENT, delta_time)
  @meta_type = meta_type
  self.data=(data)
end

Instance Attribute Details

#data ⇒ Object

Returns the value of attribute data.



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# File 'lib/midilib/event.rb', line 414

def data
  @data
end

#meta_type ⇒ Object (readonly)

Returns the value of attribute meta_type.



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# File 'lib/midilib/event.rb', line 413

def meta_type
  @meta_type
end

Class Method Details

.bytes_as_str(bytes) ⇒ Object 



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# File 'lib/midilib/event.rb', line 416

def self.bytes_as_str(bytes)
  bytes ? bytes.collect { |byte| byte.chr }.join : nil
end

.str_as_bytes(str) ⇒ Object 



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# File 'lib/midilib/event.rb', line 421

def self.str_as_bytes(str)
  str.split(//).collect { |chr| chr.ord }
end

Instance Method Details

#data_as_bytes ⇒ Object 



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# File 'lib/midilib/event.rb', line 436

def data_as_bytes
  data = []
  data << @status
  data << @meta_type
  data << (@data ? Utils.as_var_len(@data.length) : 0)
  data << @data if @data
  data.flatten
end

#data_as_str ⇒ Object 



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# File 'lib/midilib/event.rb', line 445

def data_as_str
  MetaEvent.bytes_as_str(@data)
end

#to_s ⇒ Object 



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# File 'lib/midilib/event.rb', line 459

def to_s
  str = super()
  str << "meta #{number_to_s(@meta_type)} "
  # I know, I know...this isn't OO.
  case @meta_type
  when META_SEQ_NUM
    str << "sequence number"
  when META_TEXT
    str << "text: #{data_as_str}"
  when META_COPYRIGHT
    str << "copyright: #{data_as_str}"
  when META_SEQ_NAME
    str << "sequence or track name: #{data_as_str}"
  when META_INSTRUMENT
    str << "instrument name: #{data_as_str}"
  when META_LYRIC
    str << "lyric: #{data_as_str}"
  when META_MARKER
    str << "marker: #{data_as_str}"
  when META_CUE
    str << "cue point: #{@data}"
  when META_TRACK_END
    str << "track end"
  when META_SMPTE
    str << "smpte"
  when META_TIME_SIG
    str << "time signature"
  when META_KEY_SIG
    str << "key signature"
  when META_SEQ_SPECIF
    str << "sequence specific"
  else
    # Some other possible @meta_type values are handled by subclasses.
    str << "(other)"
  end
  return str
end