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
  25 using namespace ARDOUR;
  26 using namespace std;
  27
  28 MidiPort::MidiPort (const std::string& name, Flags flags)
  29         : Port (name, DataType::MIDI, flags)
  30         , _has_been_mixed_down (false)
  31         , _resolve_in_process (false)
  32 {
  33         _buffer = new MidiBuffer (raw_buffer_size(0));
  34 }
  35
  36 MidiPort::~MidiPort()
  37 {
  38         delete _buffer;
  39 }
  40
  41 void
  42 MidiPort::cycle_start (pframes_t nframes)
  43 {
  44         Port::cycle_start (nframes);
  45
  46         _buffer->clear ();
  47
  48         assert (_buffer->size () == 0);
  49
  50         if (sends_output ()) {
  51                 jack_midi_clear_buffer (jack_port_get_buffer (_jack_port, nframes));
  52         }
  53 }
  54
  55 MidiBuffer &
  56 MidiPort::get_midi_buffer (pframes_t nframes)
  57 {
  58         if (_has_been_mixed_down) {
  59                 return *_buffer;
  60         }
  61
  62         if (receives_input ()) {
  63
  64                 void* jack_buffer = jack_port_get_buffer (_jack_port, nframes);
  65                 const pframes_t event_count = jack_midi_get_event_count (jack_buffer);
  66
  67                 assert (event_count < _buffer->capacity());
  68
  69                 /* suck all relevant MIDI events from the JACK MIDI port buffer
  70                    into our MidiBuffer
  71                 */
  72
  73                 for (pframes_t i = 0; i < event_count; ++i) {
  74
  75                         jack_midi_event_t ev;
  76
  77                         jack_midi_event_get (&ev, jack_buffer, i);
  78
  79                         if (ev.buffer[0] == 0xfe) {
  80                                 /* throw away active sensing */
  81                                 continue;
  82                         }
  83
  84                         /* check that the event is in the acceptable time range */
  85
  86                         if ((ev.time >= (_global_port_buffer_offset + _port_buffer_offset)) &&
  87                             (ev.time < (_global_port_buffer_offset + _port_buffer_offset + nframes))) {
  88                                 _buffer->push_back (ev);
  89                         } else {
  90                                 cerr << "Dropping incoming MIDI at time " << ev.time << "; offset="
  91                                      << _global_port_buffer_offset << " limit="
  92                                      << (_global_port_buffer_offset + _port_buffer_offset + nframes) << "\n";
  93                         }
  94                 }
  95
  96         } else {
  97                 _buffer->silence (nframes);
  98         }
  99
 100         if (nframes) {
 101                 _has_been_mixed_down = true;
 102         }
 103
 104         return *_buffer;
 105 }
 106
 107
 108 void
 109 MidiPort::cycle_end (pframes_t /*nframes*/)
 110 {
 111         _has_been_mixed_down = false;
 112 }
 113
 114 void
 115 MidiPort::cycle_split ()
 116 {
 117         _has_been_mixed_down = false;
 118 }
 119
 120 void
 121 MidiPort::flush_buffers (pframes_t nframes, framepos_t time)
 122 {
 123         if (sends_output ()) {
 124
 125                 void* jack_buffer = jack_port_get_buffer (_jack_port, nframes);
 126
 127                 // Feed the data through the MidiStateTracker
 128                 bool did_loop;
 129
 130                 _midi_state_tracker.track (_buffer->begin(), _buffer->end(), did_loop);
 131
 132                 if (did_loop || _resolve_in_process) {
 133                         /* add necessary note offs */
 134                         _midi_state_tracker.resolve_notes (*_buffer, time);
 135                 }
 136
 137                 _resolve_in_process = false;
 138
 139                 for (MidiBuffer::iterator i = _buffer->begin(); i != _buffer->end(); ++i) {
 140                         const Evoral::Event<framepos_t>& ev = *i;
 141
 142                         // event times are in frames, relative to cycle start
 143
 144                         assert (ev.time() < (nframes + _global_port_buffer_offset + _port_buffer_offset));
 145
 146                         if (ev.time() >= _global_port_buffer_offset + _port_buffer_offset) {
 147                                 if (jack_midi_event_write (jack_buffer, (jack_nframes_t) ev.time(), ev.buffer(), ev.size()) != 0) {
 148                                         cerr << "write failed, drop flushed note off on the floor, time "
 149                                              << ev.time() << " > " << _global_port_buffer_offset + _port_buffer_offset << endl;
 150                                 }
 151                         } else {
 152                                 cerr << "drop flushed event on the floor, time " << ev.time()
 153                                      << " < " << _global_port_buffer_offset + _port_buffer_offset << endl;
 154                         }
 155                 }
 156         }
 157 }
 158
 159 void
 160 MidiPort::transport_stopped ()
 161 {
 162         _resolve_in_process = true;
 163 }
 164
 165 size_t
 166 MidiPort::raw_buffer_size (pframes_t nframes) const
 167 {
 168         return jack_midi_max_event_size (jack_port_get_buffer (_jack_port, nframes));
 169 }
 170