comparison util/matlab_midi/getTempoChanges.m @ 81:a30e8bd6d948

matlab_midi scripts

+function [tempos,tempos_time]=getTempoChanges(midi)
+% [tempos,tempos_time]=getTempoChanges(midi)
+%
+% input: a midi struct from readmidi.m
+% output:
+%  tempos = tempo values indexed by tempos_time
+%    tempos_time is in units of ticks
+%
+% should tempo changes effect across tracks? across channels?
+%
+
+% Copyright (c) 2009 Ken Schutte
+% more info at: http://www.kenschutte.com/midi
+
+tempos = [];
+tempos_time = [];
+for i=1:length(midi.track)
+  cumtime=0;
+  for j=1:length(midi.track(i).messages)
+    cumtime = cumtime+midi.track(i).messages(j).deltatime;
+%    if (strcmp(midi.track(i).messages(j).name,'Set Tempo'))
+    if (midi.track(i).messages(j).midimeta==0 && midi.track(i).messages(j).type==81)
+      tempos_time(end+1) = cumtime;
+      d = midi.track(i).messages(j).data;
+      tempos(end+1) =  d(1)*16^4 + d(2)*16^2 + d(3);
+    end
+  end
+end
+
+
+