lily/midi-walker.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5   Jan Nieuwenhuizen <janneke@gnu.org>
   6
   7   LilyPond is free software: you can redistribute it and/or modify
   8   it under the terms of the GNU General Public License as published by
   9   the Free Software Foundation, either version 3 of the License, or
  10   (at your option) any later version.
  11
  12   LilyPond is distributed in the hope that it will be useful,
  13   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15   GNU General Public License for more details.
  16
  17   You should have received a copy of the GNU General Public License
  18   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "midi-walker.hh"
  22
  23 #include "audio-column.hh"
  24 #include "audio-staff.hh"
  25 #include "midi-item.hh"
  26 #include "midi-chunk.hh"
  27 #include "midi-stream.hh"
  28 #include "warn.hh"
  29
  30 Midi_note_event::Midi_note_event ()
  31 {
  32   ignore_ = false;
  33 }
  34
  35 int
  36 compare (Midi_note_event const &left, Midi_note_event const &right)
  37 {
  38   Moment m = (left.key - right.key);
  39
  40   if (m < 0)
  41     return -1;
  42   else if (m > 0)
  43     return 1;
  44   else
  45     return 0;
  46 }
  47
  48 bool
  49 audio_item_less (Audio_item * const a,
  50                  Audio_item * const b)
  51 {
  52   return a->get_column ()->when_ <  b->get_column ()->when_;
  53 }
  54
  55 Midi_walker::Midi_walker (Audio_staff *audio_staff, Midi_track *track)
  56 {
  57   track_ = track;
  58   index_ = 0;
  59   items_ = audio_staff->audio_items_;
  60   vector_sort (items_, audio_item_less);
  61   last_tick_ = 0;
  62   percussion_ = audio_staff->percussion_;
  63 }
  64
  65 Midi_walker::~Midi_walker ()
  66 {
  67   junk_pointers (midi_events_);
  68 }
  69
  70 void
  71 Midi_walker::finalize ()
  72 {
  73   do_stop_notes (INT_MAX);
  74 }
  75
  76 /**
  77    Find out if start_note event is needed, and do it if needed.
  78 */
  79 void
  80 Midi_walker::do_start_note (Midi_note *note)
  81 {
  82   Audio_item *ptr = items_[index_];
  83   assert (note->audio_ == ptr);
  84   int stop_ticks = int (moment_to_real (note->audio_->length_mom_) * Real (384 * 4))
  85     + ptr->audio_column_->ticks ();
  86
  87   bool play_start = true;
  88   for (vsize i = 0; i < stop_note_queue.size (); i++)
  89     {
  90       /* if this pith already in queue */
  91       if (stop_note_queue[i].val->get_semitone_pitch ()
  92           == note->get_semitone_pitch ())
  93         {
  94           if (stop_note_queue[i].key < stop_ticks)
  95             {
  96               /* let stopnote in queue be ignored,
  97                  new stop note wins */
  98               stop_note_queue[i].ignore_ = true;
  99
 100               /* don't replay start note, */
 101               play_start = false;
 102               break;
 103             }
 104           else
 105             {
 106               /* skip this stopnote,
 107                  don't play the start note */
 108               note = 0;
 109               break;
 110             }
 111         }
 112     }
 113
 114   if (note)
 115     {
 116       Midi_note_event e;
 117       e.val = new Midi_note_off (note);
 118
 119       midi_events_.push_back (e.val);
 120       e.key = int (stop_ticks);
 121       stop_note_queue.insert (e);
 122
 123       if (play_start)
 124         output_event (ptr->audio_column_->ticks (), note);
 125     }
 126 }
 127
 128 void
 129 Midi_walker::do_stop_notes (int max_ticks)
 130 {
 131   while (stop_note_queue.size () && stop_note_queue.front ().key <= max_ticks)
 132     {
 133       Midi_note_event e = stop_note_queue.get ();
 134       if (e.ignore_)
 135         {
 136           continue;
 137         }
 138
 139       int stop_ticks = e.key;
 140       Midi_note *note = e.val;
 141
 142       output_event (stop_ticks, note);
 143     }
 144 }
 145
 146 void
 147 Midi_walker::output_event (int now_ticks, Midi_item *l)
 148 {
 149   int delta_ticks = now_ticks - last_tick_;
 150   last_tick_ = now_ticks;
 151
 152   /*
 153     this is not correct, but at least it doesn't crash when you
 154     start with graces
 155   */
 156   if (delta_ticks < 0)
 157     {
 158       programming_error ("Going back in MIDI time.");
 159       delta_ticks = 0;
 160     }
 161
 162   track_->add (delta_ticks, l);
 163 }
 164
 165 void
 166 Midi_walker::process ()
 167 {
 168   Audio_item *audio = items_[index_];
 169   do_stop_notes (audio->audio_column_->ticks ());
 170
 171   if (Midi_item *midi = get_midi (audio))
 172     {
 173       if (Midi_note *note = dynamic_cast<Midi_note *> (midi))
 174         {
 175           if (note->audio_->length_mom_.to_bool ())
 176             do_start_note (note);
 177         }
 178       else
 179         output_event (audio->audio_column_->ticks (), midi);
 180     }
 181 }
 182
 183 Midi_item*
 184 Midi_walker::get_midi (Audio_item *i)
 185 {
 186   Midi_item *mi = Midi_item::get_midi (i);
 187
 188   if (percussion_)
 189     if (Midi_channel_item *mci = dynamic_cast<Midi_channel_item*> (mi))
 190       mci->channel_ = 9;
 191
 192   midi_events_.push_back (mi);
 193   return mi;
 194 }
 195
 196 bool
 197 Midi_walker::ok () const
 198 {
 199   return index_ < items_.size ();
 200 }
 201
 202 void
 203 Midi_walker::operator ++ (int)
 204 {
 205   assert (ok ());
 206   index_++;
 207 }