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