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 



431
432
433
434
435
 
# File 'lib/midilib/event.rb', line 431

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.



421
422
423
 
# File 'lib/midilib/event.rb', line 421

def data
  @data
end

#meta_type ⇒ Object (readonly)

Returns the value of attribute meta_type.



421
422
423
 
# File 'lib/midilib/event.rb', line 421

def meta_type
  @meta_type
end

Class Method Details

.bytes_as_str(bytes) ⇒ Object 



423
424
425
 
# File 'lib/midilib/event.rb', line 423

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

.str_as_bytes(str) ⇒ Object 



427
428
429
 
# File 'lib/midilib/event.rb', line 427

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

Instance Method Details

#data_as_bytes ⇒ Object 



437
438
439
440
441
442
443
444
 
# File 'lib/midilib/event.rb', line 437

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 



446
447
448
 
# File 'lib/midilib/event.rb', line 446

def data_as_str
  MetaEvent.bytes_as_str(@data)
end

#to_s ⇒ Object 



460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
 
# File 'lib/midilib/event.rb', line 460

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