Class: InevitableCacophony::MidiGenerator

Inherits:
Object
  • Object
show all
Defined in:
lib/inevitable_cacophony/midi_generator.rb,
lib/inevitable_cacophony/midi_generator/frequency_table.rb

Defined Under Namespace

Classes: FrequencyTable

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(octave_structure, tonic) ⇒ MidiGenerator

Set up a MIDI generator for a specific octave structure and tonic We need to know the octave structure because it determines how we allocate MIDI note indices to frequencies.



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# File 'lib/inevitable_cacophony/midi_generator.rb', line 16

def initialize(octave_structure, tonic)
        @frequency_table = FrequencyTable.new(octave_structure, tonic)
end

Instance Attribute Details

#frequency_table ⇒ Object (readonly)

Returns the value of attribute frequency_table.



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# File 'lib/inevitable_cacophony/midi_generator.rb', line 20

def frequency_table
  @frequency_table
end

Instance Method Details

#add_phrase(phrase) ⇒ Object

Add a phrase to the MIDI output we will generate.



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# File 'lib/inevitable_cacophony/midi_generator.rb', line 23

def add_phrase(phrase)
        @phrases ||= []
        @phrases << phrase
end

#notes_track(sequence = build_sequence) ⇒ Midi::Track

Returns Notes to be output to MIDI; mainly for testing.

Returns:

  • (Midi::Track) —

    Notes to be output to MIDI; mainly for testing.



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# File 'lib/inevitable_cacophony/midi_generator.rb', line 29

def notes_track(sequence=build_sequence)
        build_notes_track(sequence, @phrases)
end

#write(io) ⇒ Object

Write MIDI output to the given stream.



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# File 'lib/inevitable_cacophony/midi_generator.rb', line 34

def write(io)
        sequence = build_sequence
        sequence.tracks << notes_track(sequence)
        
        # Buffer output so this method can be called on stdout.
        buffer = StringIO.new
        sequence.write(buffer)
        
        io.write(buffer.string)
end