Class: Musikov::MidiWriter
- Inherits:
-
Object
- Object
- Musikov::MidiWriter
- Defined in:
- lib/musikov/midi_writer.rb
Overview
This class is responsible for interacting with MidiLib in order to write the output midi files.
Instance Method Summary collapse
-
#initialize(output_path = ".") ⇒ MidiWriter
constructor
Initializes the parser using the output path parameter * Parameter need to be a folder folder.
-
#write(sequence_hash) ⇒ Object
Writes the output midi file from the generated sequence hash.
Constructor Details
#initialize(output_path = ".") ⇒ MidiWriter
Initializes the parser using the output path parameter
-
Parameter need to be a folder folder
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# File 'lib/musikov/midi_writer.rb', line 17 def initialize(output_path = ".") @path = output_path end |
Instance Method Details
#write(sequence_hash) ⇒ Object
Writes the output midi file from the generated sequence hash
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# File 'lib/musikov/midi_writer.rb', line 22 def write(sequence_hash) # Create a new, empty sequence. seq = MIDI::Sequence.new() track = MIDI::Track.new(seq) seq.tracks << track track.events << MIDI::Tempo.new(MIDI::Tempo.bpm_to_mpq(120)) i = 0 # Create a track to hold the notes. Add it to the sequence. sequence_hash.each { |program_change, midi_elements| track = MIDI::Track.new(seq) seq.tracks << track instrument = MIDI::GM_PATCH_NAMES[program_change] # Give the track a name and an instrument name (optional). track.instrument = instrument # Add a volume controller event (optional). track.events << MIDI::Controller.new(i, MIDI::CC_VOLUME, 127) track.events << MIDI::ProgramChange.new(i, program_change, 0) midi_elements.each { |midi_element| track.events << MIDI::NoteOn.new(i, midi_element.note ,127,0) track.events << MIDI::NoteOff.new(i, midi_element.note ,127, seq.note_to_delta(midi_element.duration)) } i += 1 } write_midi(seq) end |