First draft

lib/midilib/sequence.rb

@@ -69,6 +69,51 @@ def beats_per_minute
       event = @tracks.first.events.detect { |e| e.is_a?(MIDI::Tempo) }
       event ? Tempo.mpq_to_bpm(event.tempo) : DEFAULT_TEMPO
     end
+
+    def get_tempo_parts
+      tempo_parts = {}
+      Array(@tracks).each do |track|
+        track.events.map do |e|
+          tempo_parts[e.time_from_start] = Tempo.mpq_to_bpm(e.tempo) if e.is_a?(MIDI::Tempo)
+        end
+      end
+      tempo_parts
+    end
+
+    def avg_beats_per_minute
+      return DEFAULT_TEMPO if @tracks.nil? || @tracks.empty?
+
+      bpm_min = tempo_parts.min
+      bpm_max = tempo_parts.max
+      tempo_events ? Tempo.mpq_to_bpm(event.tempo) : DEFAULT_TEMPO
+      # parts_lenght(tempo_parts.keys, self.get_measures.last.end)
+    end
+
+    def beats_per_minute_now
+
+    end
+
+    # def avg_beats_per_minute
+    #   return DEFAULT_TEMPO if @tracks.nil? || @tracks.empty?
+    #   tempo_parts = {}
+    #   Array(@tracks).each do |track|
+    #     track.events.map do |e|
+    #       tempo_parts[e.time_from_start] = Tempo.mpq_to_bpm(e.tempo) if e.is_a?(MIDI::Tempo)
+    #     end
+    #   end
+    #   # tempo_events ? Tempo.mpq_to_bpm(event.tempo) : DEFAULT_TEMPO
+    #   # parts_lenght(tempo_parts.keys, self.get_measures.last.end)
+    # end
+
+    # def parts_lenght(start_points, track_ends)
+    #   parts_lenght = []
+    #   start_points.each_with_index do |start_point, i|
+    #     start_points[i+1].nil? ? part_end = track_ends : part_end = start_points[i+1]
+    #     parts_lenght << part_end - start_point
+    #   end
+    #   parts_lenght
+    # end
+
     alias bpm beats_per_minute
     alias tempo beats_per_minute
 

testing.rb

@@ -0,0 +1,19 @@
+require_relative('lib/midilib')
+
+# Create a new, empty sequence.
+seq = MIDI::Sequence.new()
+
+# Read the contents of a MIDI file into the sequence.
+File.open('examples/ex2.mid', 'rb') { | file |
+  seq.read(file) { | track, num_tracks, i |
+    Array(track).each do |event|
+      # if MIDI::Tempo === event
+        # p event.data
+      # end
+
+    end
+
+  }
+  seq.avg_beats_per_minute
+  # p MIDI::META_TRACK_END
+}