libs/ardour/midi_port.cc

   1 /*
   2     Copyright (C) 2006 Paul Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17 */
  18
  19 #include <cassert>
  20 #include <iostream>
  21
  22 #include "ardour/midi_port.h"
  23 #include "ardour/data_type.h"
  24 #include "ardour/audioengine.h"
  25
  26 using namespace ARDOUR;
  27 using namespace std;
  28
  29 MidiPort::MidiPort (const std::string& name, Flags flags)
  30         : Port (name, DataType::MIDI, flags)
  31         , _has_been_mixed_down (false)
  32         , _resolve_required (false)
  33         , _input_active (true)
  34 {
  35         _buffer = new MidiBuffer (AudioEngine::instance()->raw_buffer_size (DataType::MIDI));
  36 }
  37
  38 MidiPort::~MidiPort()
  39 {
  40         delete _buffer;
  41 }
  42
  43 void
  44 MidiPort::cycle_start (pframes_t nframes)
  45 {
  46         Port::cycle_start (nframes);
  47
  48         _buffer->clear ();
  49
  50         assert (_buffer->size () == 0);
  51
  52         if (sends_output ()) {
  53                 jack_midi_clear_buffer (jack_port_get_buffer (_jack_port, nframes));
  54         }
  55 }
  56
  57 MidiBuffer &
  58 MidiPort::get_midi_buffer (pframes_t nframes)
  59 {
  60         if (_has_been_mixed_down) {
  61                 return *_buffer;
  62         }
  63
  64         if (receives_input ()) {
  65
  66                 if (_input_active) {
  67
  68                         void* jack_buffer = jack_port_get_buffer (_jack_port, nframes);
  69                         const pframes_t event_count = jack_midi_get_event_count (jack_buffer);
  70
  71                         assert (event_count < _buffer->capacity());
  72
  73                         /* suck all relevant MIDI events from the JACK MIDI port buffer
  74                            into our MidiBuffer
  75                         */
  76
  77                         for (pframes_t i = 0; i < event_count; ++i) {
  78
  79                                 jack_midi_event_t ev;
  80
  81                                 jack_midi_event_get (&ev, jack_buffer, i);
  82
  83                                 if (ev.buffer[0] == 0xfe) {
  84                                         /* throw away active sensing */
  85                                         continue;
  86                                 }
  87
  88                                 /* check that the event is in the acceptable time range */
  89
  90                                 if ((ev.time >= (_global_port_buffer_offset + _port_buffer_offset)) &&
  91                                     (ev.time < (_global_port_buffer_offset + _port_buffer_offset + nframes))) {
  92                                         _buffer->push_back (ev);
  93                                 } else {
  94                                         cerr << "Dropping incoming MIDI at time " << ev.time << "; offset="
  95                                              << _global_port_buffer_offset << " limit="
  96                                              << (_global_port_buffer_offset + _port_buffer_offset + nframes) << "\n";
  97                                 }
  98                         }
  99
 100                 } else {
 101                         _buffer->silence (nframes);
 102                 }
 103
 104         } else {
 105                 _buffer->silence (nframes);
 106         }
 107
 108         if (nframes) {
 109                 _has_been_mixed_down = true;
 110         }
 111
 112         return *_buffer;
 113 }
 114
 115
 116 void
 117 MidiPort::cycle_end (pframes_t /*nframes*/)
 118 {
 119         _has_been_mixed_down = false;
 120 }
 121
 122 void
 123 MidiPort::cycle_split ()
 124 {
 125         _has_been_mixed_down = false;
 126 }
 127
 128 void
 129 MidiPort::resolve_notes (void* jack_buffer, MidiBuffer::TimeType when)
 130 {
 131         uint8_t ev[3];
 132
 133         ev[2] = 0;
 134
 135         for (uint8_t channel = 0; channel <= 0xF; channel++) {
 136                 ev[0] = (MIDI_CMD_CONTROL | channel);
 137
 138                 /* we need to send all notes off AND turn the
 139                  * sustain/damper pedal off to handle synths
 140                  * that prioritize sustain over AllNotesOff
 141                  */
 142
 143                 ev[1] = MIDI_CTL_SUSTAIN;
 144
 145                 if (jack_midi_event_write (jack_buffer, when, ev, 3) != 0) {
 146                         cerr << "failed to deliver sustain-zero on channel " << channel << " on port " << name() << endl;
 147                 }
 148
 149                 ev[1] = MIDI_CTL_ALL_NOTES_OFF;
 150
 151                 if (jack_midi_event_write (jack_buffer, 0, ev, 3) != 0) {
 152                         cerr << "failed to deliver ALL NOTES OFF on channel " << channel << " on port " << name() << endl;
 153                 }
 154         }
 155 }
 156
 157 void
 158 MidiPort::flush_buffers (pframes_t nframes, framepos_t time)
 159 {
 160         if (sends_output ()) {
 161
 162                 void* jack_buffer = jack_port_get_buffer (_jack_port, nframes);
 163
 164                 if (_resolve_required) {
 165                         /* resolve all notes at the start of the buffer */
 166                         resolve_notes (jack_buffer, 0);
 167                         _resolve_required= false;
 168                 }
 169
 170                 for (MidiBuffer::iterator i = _buffer->begin(); i != _buffer->end(); ++i) {
 171
 172                         const Evoral::MIDIEvent<MidiBuffer::TimeType> ev (*i, false);
 173
 174                         // event times are in frames, relative to cycle start
 175
 176                         assert (ev.time() < (nframes + _global_port_buffer_offset + _port_buffer_offset));
 177
 178                         if (ev.event_type() == LoopEventType) {
 179                                 resolve_notes (jack_buffer, ev.time());
 180                                 continue;
 181                         }
 182
 183                         if (ev.time() >= _global_port_buffer_offset + _port_buffer_offset) {
 184                                 if (jack_midi_event_write (jack_buffer, (jack_nframes_t) ev.time(), ev.buffer(), ev.size()) != 0) {
 185                                         cerr << "write failed, drop flushed note off on the floor, time "
 186                                              << ev.time() << " > " << _global_port_buffer_offset + _port_buffer_offset << endl;
 187                                 }
 188                         } else {
 189                                 cerr << "drop flushed event on the floor, time " << ev.time()
 190                                      << " < " << _global_port_buffer_offset + _port_buffer_offset << endl;
 191                         }
 192                 }
 193         }
 194 }
 195
 196 void
 197 MidiPort::transport_stopped ()
 198 {
 199         _resolve_required = true;
 200 }
 201
 202 void
 203 MidiPort::realtime_locate ()
 204 {
 205         _resolve_required = true;
 206 }
 207
 208 void
 209 MidiPort::reset ()
 210 {
 211         Port::reset ();
 212         delete _buffer;
 213         _buffer = new MidiBuffer (AudioEngine::instance()->raw_buffer_size (DataType::MIDI));
 214 }
 215
 216 void
 217 MidiPort::set_input_active (bool yn)
 218 {
 219         _input_active = yn;
 220 }