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 if (_session->exporting()) {
60 /* no midi clock during export, for now */
64 float speed = _session->transport_speed();
65 nframes_t position = _session->transport_frame();
66 #ifdef DEBUG_MIDI_CLOCK
67 cerr << "Transport state change, speed:" << speed << "position:" << position<< " play loop " << _session->get_play_loop() << endl;
70 _last_tick = position;
72 if (!Config->get_send_midi_clock())
75 if (_session->get_play_loop()) {
76 assert(_session->locations()->auto_loop_location());
77 if (position == _session->locations()->auto_loop_location()->start()) {
80 send_continue_event(0);
82 } else if (position == 0) {
85 send_continue_event(0);
88 send_midi_clock_event(0);
90 } else if (speed == 0.0f) {
91 if (!Config->get_send_midi_clock())
97 tick(position, *((ARDOUR::BBT_Time *) 0), *((SMPTE::Time *)0));
100 void MidiClockTicker::position_changed(nframes_t position)
102 #ifdef DEBUG_MIDI_CLOCK
103 cerr << "Position changed:" << position << endl;
105 _last_tick = position;
108 void MidiClockTicker::transport_looped()
110 Location* loop_location = _session->locations()->auto_loop_location();
111 assert(loop_location);
113 #ifdef DEBUG_MIDI_CLOCK
114 cerr << "Transport looped, position:" << _session->transport_frame()
115 << " loop start " << loop_location->start( )
116 << " loop end " << loop_location->end( )
117 << " play loop " << _session->get_play_loop()
121 // adjust _last_tick, so that the next MIDI clock message is sent
122 // in due time (and the tick interval is still constant)
123 nframes_t elapsed_since_last_tick = loop_location->end() - _last_tick;
124 _last_tick = loop_location->start() - elapsed_since_last_tick;
127 void MidiClockTicker::tick(const nframes_t& transport_frames, const BBT_Time& /*transport_bbt*/, const SMPTE::Time& /*transport_smpt*/)
129 #ifdef WITH_JACK_MIDI
130 if (!Config->get_send_midi_clock() || _session == 0 || _session->transport_speed() != 1.0f)
133 MIDI::JACK_MidiPort* jack_port = dynamic_cast<MIDI::JACK_MidiPort*>(_midi_port);
137 double next_tick = _last_tick + one_ppqn_in_frames(transport_frames);
138 nframes_t next_tick_offset = nframes_t(next_tick) - transport_frames;
140 #ifdef DEBUG_MIDI_CLOCK
141 cerr << "Transport:" << transport_frames
142 << ":Last tick time:" << _last_tick << ":"
143 << ":Next tick time:" << next_tick << ":"
144 << "Offset:" << next_tick_offset << ":"
145 << "cycle length:" << jack_port->nframes_this_cycle()
149 if (next_tick_offset >= jack_port->nframes_this_cycle())
152 send_midi_clock_event(next_tick_offset);
154 _last_tick = next_tick;
156 #endif // WITH_JACK_MIDI
159 double MidiClockTicker::one_ppqn_in_frames(nframes_t transport_position)
161 const Tempo& current_tempo = _session->tempo_map().tempo_at(transport_position);
162 const Meter& current_meter = _session->tempo_map().meter_at(transport_position);
163 double frames_per_beat =
164 current_tempo.frames_per_beat(_session->nominal_frame_rate(),
167 double quarter_notes_per_beat = 4.0 / current_tempo.note_type();
168 double frames_per_quarter_note = frames_per_beat / quarter_notes_per_beat;
170 return frames_per_quarter_note / double (_ppqn);
173 void MidiClockTicker::send_midi_clock_event(nframes_t offset)
175 #ifdef WITH_JACK_MIDI
176 assert (MIDI::JACK_MidiPort::is_process_thread());
177 #endif // WITH_JACK_MIDI
178 #ifdef DEBUG_MIDI_CLOCK
179 cerr << "Tick with offset " << offset << endl;
180 #endif // DEBUG_MIDI_CLOCK
181 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CLOCK };
182 _midi_port->write(_midi_clock_tick, 1, offset);
185 void MidiClockTicker::send_start_event(nframes_t offset)
187 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_START };
188 _midi_port->write(_midi_clock_tick, 1, offset);
191 void MidiClockTicker::send_continue_event(nframes_t offset)
193 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CONTINUE };
194 _midi_port->write(_midi_clock_tick, 1, offset);
197 void MidiClockTicker::send_stop_event(nframes_t offset)
199 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_STOP };
200 _midi_port->write(_midi_clock_tick, 1, offset);