libs/ardour/midi_state_tracker.cc

   1 /*
   2     Copyright (C) 2006-2008 Paul Davis
   3     Author: Torben Hohn
   4
   5     This program is free software; you can redistribute it and/or modify it
   6     under the terms of the GNU General Public License as published by the Free
   7     Software Foundation; either version 2 of the License, or (at your option)
   8     any later version.
   9
  10     This program is distributed in the hope that it will be useful, but WITHOUT
  11     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13     for more details.
  14
  15     You should have received a copy of the GNU General Public License along
  16     with this program; if not, write to the Free Software Foundation, Inc.,
  17     675 Mass Ave, Cambridge, MA 02139, USA.
  18 */
  19
  20 #include <iostream>
  21 #include "ardour/event_type_map.h"
  22 #include "ardour/midi_ring_buffer.h"
  23 #include "ardour/midi_state_tracker.h"
  24
  25 using namespace std;
  26 using namespace ARDOUR;
  27
  28
  29 MidiStateTracker::MidiStateTracker ()
  30 {
  31         reset ();
  32 }
  33
  34 void
  35 MidiStateTracker::reset ()
  36 {
  37         memset (_active_notes, 0, sizeof (_active_notes));
  38         _on = 0;
  39 }
  40
  41 void
  42 MidiStateTracker::track_note_onoffs (const Evoral::MIDIEvent<MidiBuffer::TimeType>& event)
  43 {
  44         if (event.is_note_on()) {
  45                 add (event.note(), event.channel());
  46         } else if (event.is_note_off()){
  47                 remove (event.note(), event.channel());
  48         }
  49 }
  50
  51 void
  52 MidiStateTracker::add (uint8_t note, uint8_t chn)
  53 {
  54         ++_active_notes[note + 128 * chn];
  55         ++_on;
  56 }
  57
  58 void
  59 MidiStateTracker::remove (uint8_t note, uint8_t chn)
  60 {
  61         switch (_active_notes[note + 128 * chn]) {
  62         case 0:
  63                 break;
  64         case 1:
  65                 --_on;
  66                 _active_notes [note + 128 * chn] = 0;
  67                 break;
  68         default:
  69                 --_active_notes [note + 128 * chn];
  70                                 break;
  71
  72         }
  73 }
  74
  75 void
  76 MidiStateTracker::track (const MidiBuffer::iterator &from, const MidiBuffer::iterator &to, bool& looped)
  77 {
  78         looped = false;
  79
  80         for (MidiBuffer::iterator i = from; i != to; ++i) {
  81                 const Evoral::MIDIEvent<MidiBuffer::TimeType> ev(*i, false);
  82                 if (ev.event_type() == LoopEventType) {
  83                         looped = true;
  84                         continue;
  85                 }
  86
  87                 track_note_onoffs (ev);
  88         }
  89 }
  90
  91 void
  92 MidiStateTracker::resolve_notes (MidiBuffer &dst, nframes64_t time)
  93 {
  94         if (!_on) {
  95                 return;
  96         }
  97
  98         for (int channel = 0; channel < 16; ++channel) {
  99                 for (int note = 0; note < 128; ++note) {
 100                         while (_active_notes[note + 128 * channel]) {
 101                                 uint8_t buffer[3] = { MIDI_CMD_NOTE_OFF | channel, note, 0 };
 102                                 Evoral::MIDIEvent<MidiBuffer::TimeType> noteoff
 103                                         (time, MIDI_CMD_NOTE_OFF, 3, buffer, false);
 104                                 dst.push_back (noteoff);
 105                                 _active_notes[note + 128 * channel]--;
 106                         }
 107                 }
 108         }
 109         _on = 0;
 110 }
 111
 112 void
 113 MidiStateTracker::resolve_notes (Evoral::EventSink<nframes_t> &dst, nframes64_t time)
 114 {
 115         uint8_t buf[3];
 116
 117         if (!_on) {
 118                 return;
 119         }
 120
 121         for (int channel = 0; channel < 16; ++channel) {
 122                 for (int note = 0; note < 128; ++note) {
 123                         while (_active_notes[note + 128 * channel]) {
 124                                 buf[0] = MIDI_CMD_NOTE_OFF|channel;
 125                                 buf[1] = note;
 126                                 buf[2] = 0;
 127                                 dst.write (time, EventTypeMap::instance().midi_event_type (buf[0]), 3, buf);
 128                                 _active_notes[note + 128 * channel]--;
 129                         }
 130                 }
 131         }
 132         _on = 0;
 133 }
 134
 135 void
 136 MidiStateTracker::dump (ostream& o)
 137 {
 138         o << "******\n";
 139         for (int c = 0; c < 16; ++c) {
 140                 for (int x = 0; x < 128; ++x) {
 141                         if (_active_notes[c * 128 + x]) {
 142                                 o << "Channel " << c+1 << " Note " << x << " is on ("
 143                                   << (int) _active_notes[c*128+x] <<  "times)\n";
 144                         }
 145                 }
 146         }
 147         o << "+++++\n";
 148 }