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_source.h"
  24 #include "ardour/midi_state_tracker.h"
  25
  26 using namespace std;
  27 using namespace ARDOUR;
  28
  29
  30 MidiStateTracker::MidiStateTracker ()
  31 {
  32         reset ();
  33 }
  34
  35 void
  36 MidiStateTracker::reset ()
  37 {
  38         memset (_active_notes, 0, sizeof (_active_notes));
  39         _on = 0;
  40 }
  41
  42 void
  43 MidiStateTracker::track_note_onoffs (const Evoral::MIDIEvent<MidiBuffer::TimeType>& event)
  44 {
  45         if (event.is_note_on()) {
  46                 add (event.note(), event.channel());
  47         } else if (event.is_note_off()){
  48                 remove (event.note(), event.channel());
  49         }
  50 }
  51
  52 void
  53 MidiStateTracker::add (uint8_t note, uint8_t chn)
  54 {
  55         ++_active_notes[note + 128 * chn];
  56         ++_on;
  57 }
  58
  59 void
  60 MidiStateTracker::remove (uint8_t note, uint8_t chn)
  61 {
  62         switch (_active_notes[note + 128 * chn]) {
  63         case 0:
  64                 break;
  65         case 1:
  66                 --_on;
  67                 _active_notes [note + 128 * chn] = 0;
  68                 break;
  69         default:
  70                 --_active_notes [note + 128 * chn];
  71                                 break;
  72
  73         }
  74 }
  75
  76 void
  77 MidiStateTracker::track (const MidiBuffer::iterator &from, const MidiBuffer::iterator &to, bool& looped)
  78 {
  79         looped = false;
  80
  81         for (MidiBuffer::iterator i = from; i != to; ++i) {
  82                 const Evoral::MIDIEvent<MidiBuffer::TimeType> ev(*i, false);
  83                 if (ev.event_type() == LoopEventType) {
  84                         looped = true;
  85                         continue;
  86                 }
  87
  88                 track_note_onoffs (ev);
  89         }
  90 }
  91
  92 void
  93 MidiStateTracker::resolve_notes (MidiBuffer &dst, framepos_t time)
  94 {
  95         if (!_on) {
  96                 return;
  97         }
  98
  99         for (int channel = 0; channel < 16; ++channel) {
 100                 for (int note = 0; note < 128; ++note) {
 101                         while (_active_notes[note + 128 * channel]) {
 102                                 uint8_t buffer[3] = { MIDI_CMD_NOTE_OFF | channel, note, 0 };
 103                                 Evoral::MIDIEvent<MidiBuffer::TimeType> noteoff
 104                                         (MIDI_CMD_NOTE_OFF, time, 3, buffer, false);
 105                                 dst.push_back (noteoff);
 106                                 _active_notes[note + 128 * channel]--;
 107                         }
 108                 }
 109         }
 110         _on = 0;
 111 }
 112
 113 void
 114 MidiStateTracker::resolve_notes (Evoral::EventSink<framepos_t> &dst, framepos_t time)
 115 {
 116         uint8_t buf[3];
 117
 118         if (!_on) {
 119                 return;
 120         }
 121
 122         for (int channel = 0; channel < 16; ++channel) {
 123                 for (int note = 0; note < 128; ++note) {
 124                         while (_active_notes[note + 128 * channel]) {
 125                                 buf[0] = MIDI_CMD_NOTE_OFF|channel;
 126                                 buf[1] = note;
 127                                 buf[2] = 0;
 128                                 dst.write (time, EventTypeMap::instance().midi_event_type (buf[0]), 3, buf);
 129                                 _active_notes[note + 128 * channel]--;
 130                         }
 131                 }
 132         }
 133         _on = 0;
 134 }
 135
 136 void
 137 MidiStateTracker::resolve_notes (MidiSource& src, Evoral::MusicalTime time)
 138 {
 139         if (!_on) {
 140                 return;
 141         }
 142
 143         /* NOTE: the src must be locked */
 144
 145         for (int channel = 0; channel < 16; ++channel) {
 146                 for (int note = 0; note < 128; ++note) {
 147                         while (_active_notes[note + 128 * channel]) {
 148                                 Evoral::MIDIEvent<Evoral::MusicalTime> ev ((MIDI_CMD_NOTE_OFF|channel), time, 3, 0, true);
 149                                 ev.set_type (MIDI_CMD_NOTE_OFF);
 150                                 ev.set_channel (channel);
 151                                 ev.set_note (note);
 152                                 ev.set_velocity (0);
 153                                 src.append_event_unlocked_beats (ev);
 154                                 _active_notes[note + 128 * channel]--;
 155                                 /* don't stack events up at the same time */
 156                                 time += 1.0/128.0;
 157                         }
 158                 }
 159         }
 160         _on = 0;
 161 }
 162
 163 void
 164 MidiStateTracker::dump (ostream& o)
 165 {
 166         o << "******\n";
 167         for (int c = 0; c < 16; ++c) {
 168                 for (int x = 0; x < 128; ++x) {
 169                         if (_active_notes[c * 128 + x]) {
 170                                 o << "Channel " << c+1 << " Note " << x << " is on ("
 171                                   << (int) _active_notes[c*128+x] <<  "times)\n";
 172                         }
 173                 }
 174         }
 175         o << "+++++\n";
 176 }