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 "ardour/ticker.h"
22 #include "ardour/session.h"
23 #include "ardour/tempo.h"
29 void Ticker::set_session(Session& s)
34 _session->tick.connect(mem_fun (*this, &Ticker::tick));
35 _session->GoingAway.connect(mem_fun (*this, &Ticker::going_away));
39 void MidiClockTicker::set_session(Session& s)
41 Ticker::set_session(s);
44 _session->MIDIClock_PortChanged.connect(mem_fun (*this, &MidiClockTicker::update_midi_clock_port));
45 _session->TransportStateChange .connect(mem_fun (*this, &MidiClockTicker::transport_state_changed));
46 _session->PositionChanged .connect(mem_fun (*this, &MidiClockTicker::position_changed));
47 _session->TransportLooped .connect(mem_fun (*this, &MidiClockTicker::transport_looped));
48 update_midi_clock_port();
52 void MidiClockTicker::update_midi_clock_port()
54 _midi_port = _session->midi_clock_port();
57 void MidiClockTicker::transport_state_changed()
59 float speed = _session->transport_speed();
60 nframes_t position = _session->transport_frame();
61 #ifdef DEBUG_MIDI_CLOCK
62 cerr << "Transport state change, speed:" << speed << "position:" << position<< " play loop " << _session->get_play_loop() << endl;
65 _last_tick = position;
67 if (!Config->get_send_midi_clock())
70 if (_session->get_play_loop()) {
71 assert(_session->locations()->auto_loop_location());
72 if (position == _session->locations()->auto_loop_location()->start()) {
75 send_continue_event(0);
77 } else if (position == 0) {
80 send_continue_event(0);
83 send_midi_clock_event(0);
85 } else if (speed == 0.0f) {
86 if (!Config->get_send_midi_clock())
92 tick(position, *((ARDOUR::BBT_Time *) 0), *((SMPTE::Time *)0));
95 void MidiClockTicker::position_changed(nframes_t position)
97 #ifdef DEBUG_MIDI_CLOCK
98 cerr << "Position changed:" << position << endl;
100 _last_tick = position;
103 void MidiClockTicker::transport_looped()
105 Location* loop_location = _session->locations()->auto_loop_location();
106 assert(loop_location);
108 #ifdef DEBUG_MIDI_CLOCK
109 cerr << "Transport looped, position:" << _session->transport_frame()
110 << " loop start " << loop_location->start( )
111 << " loop end " << loop_location->end( )
112 << " play loop " << _session->get_play_loop()
116 // adjust _last_tick, so that the next MIDI clock message is sent
117 // in due time (and the tick interval is still constant)
118 nframes_t elapsed_since_last_tick = loop_location->end() - _last_tick;
119 _last_tick = loop_location->start() - elapsed_since_last_tick;
122 void MidiClockTicker::tick(const nframes_t& transport_frames, const BBT_Time& transport_bbt, const SMPTE::Time& transport_smpt)
124 #ifdef WITH_JACK_MIDI
125 if (!Config->get_send_midi_clock() || _session == 0 || _session->transport_speed() != 1.0f)
128 MIDI::JACK_MidiPort* jack_port = dynamic_cast<MIDI::JACK_MidiPort*>(_midi_port);
132 double next_tick = _last_tick + one_ppqn_in_frames(transport_frames);
133 nframes_t next_tick_offset = nframes_t(next_tick) - transport_frames;
135 #ifdef DEBUG_MIDI_CLOCK
136 cerr << "Transport:" << transport_frames
137 << ":Last tick time:" << _last_tick << ":"
138 << ":Next tick time:" << next_tick << ":"
139 << "Offset:" << next_tick_offset << ":"
140 << "cycle length:" << jack_port->nframes_this_cycle()
144 if (next_tick_offset >= jack_port->nframes_this_cycle())
147 send_midi_clock_event(next_tick_offset);
149 _last_tick = next_tick;
151 #endif // WITH_JACK_MIDI
154 double MidiClockTicker::one_ppqn_in_frames(nframes_t transport_position)
156 const Tempo& current_tempo = _session->tempo_map().tempo_at(transport_position);
157 const Meter& current_meter = _session->tempo_map().meter_at(transport_position);
158 double frames_per_beat =
159 current_tempo.frames_per_beat(_session->nominal_frame_rate(),
162 double quarter_notes_per_beat = 4.0 / current_tempo.note_type();
163 double frames_per_quarter_note = frames_per_beat / quarter_notes_per_beat;
165 return frames_per_quarter_note / double (_ppqn);
168 void MidiClockTicker::send_midi_clock_event(nframes_t offset)
170 #ifdef WITH_JACK_MIDI
171 assert (MIDI::JACK_MidiPort::is_process_thread());
172 #endif // WITH_JACK_MIDI
173 #ifdef DEBUG_MIDI_CLOCK
174 cerr << "Tick with offset " << offset << endl;
175 #endif // DEBUG_MIDI_CLOCK
176 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CLOCK };
177 _midi_port->write(_midi_clock_tick, 1, offset);
180 void MidiClockTicker::send_start_event(nframes_t offset)
182 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_START };
183 _midi_port->write(_midi_clock_tick, 1, offset);
186 void MidiClockTicker::send_continue_event(nframes_t offset)
188 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CONTINUE };
189 _midi_port->write(_midi_clock_tick, 1, offset);
192 void MidiClockTicker::send_stop_event(nframes_t offset)
194 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_STOP };
195 _midi_port->write(_midi_clock_tick, 1, offset);