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 #ifdef DEBUG_MIDI_CLOCK
30 using namespace ARDOUR;
32 void Ticker::set_session (Session* s)
34 SessionHandlePtr::set_session (s);
37 _session->tick.connect_same_thread (_session_connections, boost::bind (&Ticker::tick, this, _1, _2, _3));
41 void MidiClockTicker::set_session (Session* s)
43 Ticker::set_session (s);
46 _session->MIDIClock_PortChanged.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::update_midi_clock_port, this));
47 _session->TransportStateChange.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::transport_state_changed, this));
48 _session->PositionChanged.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::position_changed, this, _1));
49 _session->TransportLooped.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::transport_looped, this));
50 update_midi_clock_port();
55 MidiClockTicker::session_going_away ()
57 SessionHandlePtr::session_going_away();
61 void MidiClockTicker::update_midi_clock_port()
63 _midi_port = _session->midi_clock_port();
66 void MidiClockTicker::transport_state_changed()
68 if (_session->exporting()) {
69 /* no midi clock during export, for now */
73 float speed = _session->transport_speed();
74 nframes_t position = _session->transport_frame();
75 #ifdef DEBUG_MIDI_CLOCK
76 cerr << "Transport state change, speed:" << speed << "position:" << position<< " play loop " << _session->get_play_loop() << endl;
79 _last_tick = position;
81 if (!Config->get_send_midi_clock())
84 if (_session->get_play_loop()) {
85 assert(_session->locations()->auto_loop_location());
86 if (position == _session->locations()->auto_loop_location()->start()) {
89 send_continue_event(0);
91 } else if (position == 0) {
94 send_continue_event(0);
97 send_midi_clock_event(0);
99 } else if (speed == 0.0f) {
100 if (!Config->get_send_midi_clock())
106 tick(position, *((ARDOUR::BBT_Time *) 0), *((Timecode::Time *)0));
109 void MidiClockTicker::position_changed(nframes_t position)
111 #ifdef DEBUG_MIDI_CLOCK
112 cerr << "Position changed:" << position << endl;
114 _last_tick = position;
117 void MidiClockTicker::transport_looped()
119 Location* loop_location = _session->locations()->auto_loop_location();
120 assert(loop_location);
122 #ifdef DEBUG_MIDI_CLOCK
123 cerr << "Transport looped, position:" << _session->transport_frame()
124 << " loop start " << loop_location->start( )
125 << " loop end " << loop_location->end( )
126 << " play loop " << _session->get_play_loop()
130 // adjust _last_tick, so that the next MIDI clock message is sent
131 // in due time (and the tick interval is still constant)
132 nframes_t elapsed_since_last_tick = loop_location->end() - _last_tick;
133 _last_tick = loop_location->start() - elapsed_since_last_tick;
136 void MidiClockTicker::tick(const nframes_t& transport_frames, const BBT_Time& /*transport_bbt*/, const Timecode::Time& /*transport_smpt*/)
138 if (!Config->get_send_midi_clock() || _session == 0 || _session->transport_speed() != 1.0f || _midi_port == 0)
141 MIDI::JACK_MidiPort* jack_port = dynamic_cast<MIDI::JACK_MidiPort*>(_midi_port);
145 double next_tick = _last_tick + one_ppqn_in_frames(transport_frames);
146 nframes_t next_tick_offset = nframes_t(next_tick) - transport_frames;
148 #ifdef DEBUG_MIDI_CLOCK
149 cerr << "Transport:" << transport_frames
150 << ":Last tick time:" << _last_tick << ":"
151 << ":Next tick time:" << next_tick << ":"
152 << "Offset:" << next_tick_offset << ":"
153 << "cycle length:" << jack_port->nframes_this_cycle()
157 if (next_tick_offset >= jack_port->nframes_this_cycle())
160 send_midi_clock_event(next_tick_offset);
162 _last_tick = next_tick;
166 double MidiClockTicker::one_ppqn_in_frames(nframes_t transport_position)
168 const Tempo& current_tempo = _session->tempo_map().tempo_at(transport_position);
169 const Meter& current_meter = _session->tempo_map().meter_at(transport_position);
170 double frames_per_beat =
171 current_tempo.frames_per_beat(_session->nominal_frame_rate(),
174 double quarter_notes_per_beat = 4.0 / current_tempo.note_type();
175 double frames_per_quarter_note = frames_per_beat / quarter_notes_per_beat;
177 return frames_per_quarter_note / double (_ppqn);
180 void MidiClockTicker::send_midi_clock_event(nframes_t offset)
186 #ifdef WITH_JACK_MIDI
187 assert (MIDI::JACK_MidiPort::is_process_thread());
188 #endif // WITH_JACK_MIDI
189 #ifdef DEBUG_MIDI_CLOCK
190 cerr << "Tick with offset " << offset << endl;
191 #endif // DEBUG_MIDI_CLOCK
192 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CLOCK };
193 _midi_port->write(_midi_clock_tick, 1, offset);
196 void MidiClockTicker::send_start_event(nframes_t offset)
202 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_START };
203 _midi_port->write(_midi_clock_tick, 1, offset);
206 void MidiClockTicker::send_continue_event(nframes_t offset)
212 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CONTINUE };
213 _midi_port->write(_midi_clock_tick, 1, offset);
216 void MidiClockTicker::send_stop_event(nframes_t offset)
222 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_STOP };
223 _midi_port->write(_midi_clock_tick, 1, offset);