lily/midi-walker.cc

   1 /*
   2   midi-walker.cc -- implement Midi_walker
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7          Jan Nieuwenhuizen <janneke@gnu.org>
   8  */
   9
  10 #include "midi-walker.hh"
  11 #include "audio-column.hh"
  12 #include "audio-item.hh"
  13 #include "audio-staff.hh"
  14 #include "midi-item.hh"
  15 #include "midi-stream.hh"
  16 #include "debug.hh"
  17
  18 Midi_note_event::Midi_note_event()
  19 {
  20   ignore_b_ = false;
  21 }
  22
  23 int
  24 compare (Midi_note_event const& left, Midi_note_event const& right)
  25 {
  26   return sign (left.key - right.key);
  27 }
  28
  29 Midi_walker::Midi_walker (Audio_staff* audio_staff_l, Midi_track* track_l)
  30 {
  31   track_l_ = track_l;
  32   index_= 0;
  33   item_l_arr_l_ = &audio_staff_l->audio_item_l_arr_;
  34   last_mom_ = 0;
  35 }
  36
  37 Midi_walker::~Midi_walker()
  38 {
  39   // ugh
  40   do_stop_notes (last_mom_ + Moment (10, 1));
  41 }
  42
  43 /**
  44   Find out if start_note event is needed, and do it if needed.
  45  */
  46 void
  47 Midi_walker::do_start_note (Midi_note* note_p)
  48 {
  49   Audio_item* ptr = (*item_l_arr_l_)[index_];
  50   Moment stop_mom = note_p->length_mom () + ptr->audio_column_l_->at_mom ();
  51   for (int i=0; i < stop_note_queue.size(); i++)
  52     {
  53       if (stop_note_queue[i].val->pitch_i() == note_p->pitch_i ())
  54         {
  55           if (stop_note_queue[i].key < stop_mom)
  56             stop_note_queue[i].ignore_b_ = true;
  57           else {
  58             // skip the stopnote
  59             delete note_p;
  60             return;
  61           }
  62         }
  63     }
  64
  65   Midi_note_event e;
  66   e.val = new Midi_note_off (note_p);
  67   e.key = stop_mom;
  68   stop_note_queue.insert (e);
  69
  70   output_event (ptr->audio_column_l_->at_mom (), note_p);
  71 }
  72
  73 /**
  74   Output note events for all notes which end before #max_mom#
  75  */
  76 void
  77 Midi_walker::do_stop_notes (Moment max_mom)
  78 {
  79   while (stop_note_queue.size() && stop_note_queue.front ().key <= max_mom)
  80     {
  81       Midi_note_event e = stop_note_queue.get();
  82       if (e.ignore_b_)
  83         {
  84           delete e.val;
  85           continue;
  86         }
  87
  88       Moment stop_mom = e.key;
  89       Midi_note* note_p = e.val;
  90
  91       output_event (stop_mom, note_p);
  92     }
  93 }
  94
  95 /**
  96   Advance the track to #now#, output the item, and adjust current "moment".
  97  */
  98 void
  99 Midi_walker::output_event (Moment now_mom, Midi_item* l)
 100 {
 101   Moment delta_t = now_mom - last_mom_ ;
 102   last_mom_ += delta_t;
 103   track_l_->add (delta_t, l);
 104 }
 105
 106 void
 107 Midi_walker::process()
 108 {
 109   Audio_item* audio_p = (*item_l_arr_l_)[index_];
 110   do_stop_notes (audio_p->audio_column_l_->at_mom ());
 111
 112   /*
 113     THIS IS A MEMORY LEAK. FIXME.
 114    */
 115   //Midi_item* p = ptr->midi_item_p ();
 116   if (Midi_item* midi_p = Midi_item::midi_p (audio_p))
 117     {
 118       midi_p->channel_i_ = track_l_->number_i_;
 119       if (Midi_note* note_p = dynamic_cast<Midi_note*>(midi_p))
 120         {
 121           if (note_p->length_mom ())
 122             do_start_note (note_p);
 123         }
 124       else
 125         output_event (audio_p->audio_column_l_->at_mom (), midi_p);
 126     }
 127 }
 128
 129 bool
 130 Midi_walker::ok () const
 131 {
 132   return index_ <item_l_arr_l_->size ();
 133 }
 134
 135 void
 136 Midi_walker::operator ++(int)
 137 {
 138   assert (ok());
 139   index_++;
 140 }