src/midiwalker.cc

   1 /*
   2   midiwalker.cc -- implement Midi_walker
   3
   4   source file of the LilyPond music typesetter
   5
   6   (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>, Jan Nieuwenhuizen <jan@digicash.com>
   7 */
   8
   9 #include "musicalrequest.hh"
  10 #include "pscore.hh"
  11 #include "staff.hh"
  12 #include "midiwalker.hh"
  13 #include "midiitem.hh"
  14 #include "midistream.hh"
  15 #include "debug.hh"
  16 #include "staffcolumn.hh"
  17
  18 Midi_walker::Midi_walker(Staff *st_l, Midi_track* track_l)
  19     : PCursor<Staff_column*>(st_l->cols_)
  20 {
  21     track_l_ = track_l;
  22     last_moment_= 0;
  23 }
  24
  25 /**
  26   output notestop events for all notes which end before #max_moment#
  27  */
  28 void
  29 Midi_walker::do_stop_notes(Moment max_moment)
  30 {
  31     while (stop_notes.size() && stop_notes.front_idx() <= max_moment) {
  32         Moment stop_moment = stop_notes.front_idx();
  33         Melodic_req * req_l = stop_notes.get();
  34
  35         Midi_note note(req_l, track_l_->number_i_, false);
  36         output_event(note, stop_moment);
  37     }
  38 }
  39 /** advance the track to #now#, output the item, and adjust current
  40   "moment".  */
  41 void
  42 Midi_walker::output_event(Midi_item &i, Moment now)
  43 {
  44     Moment delta_t = now - last_moment_ ;
  45     last_moment_ += delta_t;
  46     track_l_->add(delta_t, &i );
  47 }
  48
  49 void
  50 Midi_walker::process_requests()
  51 {
  52     do_stop_notes(ptr()->when());
  53     for ( int i = 0; i < ptr()->musicalreq_l_arr_.size(); i++ )  {
  54
  55         Rhythmic_req *n = ptr()->musicalreq_l_arr_[i]->rhythmic();
  56         if ( !n)
  57             continue;
  58         Note_req * note_l = n->note();
  59         if (!note_l)
  60             continue;
  61
  62         Midi_note note(note_l, track_l_->number_i_, true);
  63         stop_notes.enter(note_l, n->duration() + ptr()->when() );
  64         output_event(note, ptr()->when());
  65     }
  66 }
  67
  68 Midi_walker::~Midi_walker()
  69 {
  70     do_stop_notes( last_moment_ + Moment(10,1)); // ugh
  71 }