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"
25 #define DEBUG_TICKER 0
31 void Ticker::set_session(Session& s)
36 _session->tick.connect(mem_fun (*this, &Ticker::tick));
37 _session->GoingAway.connect(mem_fun (*this, &Ticker::going_away));
41 void MidiClockTicker::set_session(Session& s)
43 Ticker::set_session(s);
46 _session->MIDIClock_PortChanged.connect(mem_fun (*this, &MidiClockTicker::update_midi_clock_port));
47 _session->TransportStateChange .connect(mem_fun (*this, &MidiClockTicker::transport_state_changed));
48 _session->PositionChanged .connect(mem_fun (*this, &MidiClockTicker::position_changed));
49 _session->TransportLooped .connect(mem_fun (*this, &MidiClockTicker::transport_looped));
50 update_midi_clock_port();
54 void MidiClockTicker::update_midi_clock_port()
56 _jack_port = (MIDI::JACK_MidiPort*) _session->midi_clock_port();
59 void MidiClockTicker::transport_state_changed()
61 float speed = _session->transport_speed();
62 nframes_t position = _session->transport_frame();
64 cerr << "Transport state change, speed:" << speed << "position:" << position<< " play loop " << _session->get_play_loop() << endl;
67 _last_tick = position;
69 if (!Config->get_send_midi_clock())
72 if (_session->get_play_loop()) {
73 assert(_session->locations()->auto_loop_location());
74 if (position == _session->locations()->auto_loop_location()->start()) {
77 send_continue_event(0);
79 } else if (position == 0) {
82 send_continue_event(0);
85 send_midi_clock_event(0);
87 } else if (speed == 0.0f) {
88 if (!Config->get_send_midi_clock())
94 tick(position, *((ARDOUR::BBT_Time *) 0), *((SMPTE::Time *)0));
97 void MidiClockTicker::position_changed(nframes_t position)
100 cerr << "Position changed:" << position << endl;
102 _last_tick = position;
105 void MidiClockTicker::transport_looped()
107 nframes_t position = _session->transport_frame();
109 Location* loop_location = _session->locations()->auto_loop_location();
110 assert(loop_location);
113 cerr << "Transport looped, position:" << position
114 << " loop start " << loop_location->start( )
115 << " loop end " << loop_location->end( )
116 << " play loop " << _session->get_play_loop()
120 // adjust _last_tick, so that the next MIDI clock message is sent
121 // in due time (and the tick interval is still constant)
122 nframes_t elapsed_since_last_tick = loop_location->end() - _last_tick;
123 _last_tick = loop_location->start() - elapsed_since_last_tick;
126 void MidiClockTicker::tick(const nframes_t& transport_frames, const BBT_Time& transport_bbt, const SMPTE::Time& transport_smpt)
128 if (!Config->get_send_midi_clock() || _session == 0 || _session->transport_speed() != 1.0f)
132 double next_tick = _last_tick + one_ppqn_in_frames(transport_frames);
133 nframes_t next_tick_offset = nframes_t(next_tick) - transport_frames;
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;
153 double MidiClockTicker::one_ppqn_in_frames(nframes_t transport_position)
155 const Tempo& current_tempo = _session->tempo_map().tempo_at(transport_position);
156 const Meter& current_meter = _session->tempo_map().meter_at(transport_position);
157 double frames_per_beat =
158 current_tempo.frames_per_beat(_session->nominal_frame_rate(),
161 double quarter_notes_per_beat = 4.0 / current_tempo.note_type();
162 double frames_per_quarter_note = frames_per_beat / quarter_notes_per_beat;
164 return frames_per_quarter_note / double (_ppqn);
167 void MidiClockTicker::send_midi_clock_event(nframes_t offset)
169 assert(_jack_port->is_process_thread());
171 cerr << "Tick with offset " << offset << endl;
173 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CLOCK };
174 _jack_port->write(_midi_clock_tick, 1, offset);
177 void MidiClockTicker::send_start_event(nframes_t offset)
179 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_START };
180 _jack_port->write(_midi_clock_tick, 1, offset);
183 void MidiClockTicker::send_continue_event(nframes_t offset)
185 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CONTINUE };
186 _jack_port->write(_midi_clock_tick, 1, offset);
189 void MidiClockTicker::send_stop_event(nframes_t offset)
191 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_STOP };
192 _jack_port->write(_midi_clock_tick, 1, offset);