2 Copyright (C) 2008 Hans Baier
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.
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.
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.
21 #include "midi++/port.h"
22 #include "evoral/midi_events.h"
23 #include "ardour/ticker.h"
24 #include "ardour/session.h"
25 #include "ardour/tempo.h"
27 #ifdef DEBUG_MIDI_CLOCK
32 using namespace ARDOUR;
34 void Ticker::set_session (Session* s)
36 SessionHandlePtr::set_session (s);
39 _session->tick.connect_same_thread (_session_connections, boost::bind (&Ticker::tick, this, _1, _2, _3));
43 void MidiClockTicker::set_session (Session* s)
45 Ticker::set_session (s);
48 _session->MIDIClock_PortChanged.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::update_midi_clock_port, this));
49 _session->TransportStateChange.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::transport_state_changed, this));
50 _session->PositionChanged.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::position_changed, this, _1));
51 _session->TransportLooped.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::transport_looped, this));
52 update_midi_clock_port();
57 MidiClockTicker::session_going_away ()
59 SessionHandlePtr::session_going_away();
63 void MidiClockTicker::update_midi_clock_port()
65 _midi_port = _session->midi_clock_port();
68 void MidiClockTicker::transport_state_changed()
70 if (_session->exporting()) {
71 /* no midi clock during export, for now */
75 float speed = _session->transport_speed();
76 nframes_t position = _session->transport_frame();
77 #ifdef DEBUG_MIDI_CLOCK
78 cerr << "Transport state change, speed:" << speed << "position:" << position<< " play loop " << _session->get_play_loop() << endl;
81 _last_tick = position;
83 if (!Config->get_send_midi_clock())
86 if (_session->get_play_loop()) {
87 assert(_session->locations()->auto_loop_location());
88 if (position == _session->locations()->auto_loop_location()->start()) {
91 send_continue_event(0);
93 } else if (position == 0) {
96 send_continue_event(0);
99 send_midi_clock_event(0);
101 } else if (speed == 0.0f) {
102 if (!Config->get_send_midi_clock())
108 tick(position, *((ARDOUR::BBT_Time *) 0), *((Timecode::Time *)0));
111 void MidiClockTicker::position_changed(nframes_t position)
113 #ifdef DEBUG_MIDI_CLOCK
114 cerr << "Position changed:" << position << endl;
116 _last_tick = position;
119 void MidiClockTicker::transport_looped()
121 Location* loop_location = _session->locations()->auto_loop_location();
122 assert(loop_location);
124 #ifdef DEBUG_MIDI_CLOCK
125 cerr << "Transport looped, position:" << _session->transport_frame()
126 << " loop start " << loop_location->start( )
127 << " loop end " << loop_location->end( )
128 << " play loop " << _session->get_play_loop()
132 // adjust _last_tick, so that the next MIDI clock message is sent
133 // in due time (and the tick interval is still constant)
134 nframes_t elapsed_since_last_tick = loop_location->end() - _last_tick;
135 _last_tick = loop_location->start() - elapsed_since_last_tick;
138 void MidiClockTicker::tick(const nframes_t& transport_frames, const BBT_Time& /*transport_bbt*/, const Timecode::Time& /*transport_smpt*/)
140 if (!Config->get_send_midi_clock() || _session == 0 || _session->transport_speed() != 1.0f || _midi_port == 0)
144 double next_tick = _last_tick + one_ppqn_in_frames(transport_frames);
145 nframes_t next_tick_offset = nframes_t(next_tick) - transport_frames;
147 #ifdef DEBUG_MIDI_CLOCK
148 cerr << "Transport:" << transport_frames
149 << ":Last tick time:" << _last_tick << ":"
150 << ":Next tick time:" << next_tick << ":"
151 << "Offset:" << next_tick_offset << ":"
152 << "cycle length:" << _midi_port->nframes_this_cycle()
156 if (next_tick_offset >= _midi_port->nframes_this_cycle())
159 send_midi_clock_event(next_tick_offset);
161 _last_tick = next_tick;
165 double MidiClockTicker::one_ppqn_in_frames(nframes_t transport_position)
167 const Tempo& current_tempo = _session->tempo_map().tempo_at(transport_position);
168 const Meter& current_meter = _session->tempo_map().meter_at(transport_position);
169 double frames_per_beat =
170 current_tempo.frames_per_beat(_session->nominal_frame_rate(),
173 double quarter_notes_per_beat = 4.0 / current_tempo.note_type();
174 double frames_per_quarter_note = frames_per_beat / quarter_notes_per_beat;
176 return frames_per_quarter_note / double (_ppqn);
179 void MidiClockTicker::send_midi_clock_event(nframes_t offset)
185 assert (MIDI::Port::is_process_thread());
186 #ifdef DEBUG_MIDI_CLOCK
187 cerr << "Tick with offset " << offset << endl;
188 #endif // DEBUG_MIDI_CLOCK
189 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CLOCK };
190 _midi_port->write(_midi_clock_tick, 1, offset);
193 void MidiClockTicker::send_start_event(nframes_t offset)
199 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_START };
200 _midi_port->write(_midi_clock_tick, 1, offset);
203 void MidiClockTicker::send_continue_event(nframes_t offset)
209 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CONTINUE };
210 _midi_port->write(_midi_clock_tick, 1, offset);
213 void MidiClockTicker::send_stop_event(nframes_t offset)
219 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_STOP };
220 _midi_port->write(_midi_clock_tick, 1, offset);