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 "midi++/manager.h"
23 #include "evoral/midi_events.h"
24 #include "ardour/ticker.h"
25 #include "ardour/session.h"
26 #include "ardour/tempo.h"
27 #include "ardour/debug.h"
29 #ifdef DEBUG_MIDI_CLOCK
34 using namespace ARDOUR;
36 void Ticker::set_session (Session* s)
38 SessionHandlePtr::set_session (s);
41 _session->tick.connect_same_thread (_session_connections, boost::bind (&Ticker::tick, this, _1, _2, _3));
45 void MidiClockTicker::set_session (Session* s)
47 Ticker::set_session (s);
50 _session->TransportStateChange.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::transport_state_changed, this));
51 _session->PositionChanged.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::position_changed, this, _1));
52 _session->TransportLooped.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::transport_looped, this));
53 update_midi_clock_port();
58 MidiClockTicker::session_going_away ()
60 SessionHandlePtr::session_going_away();
64 void MidiClockTicker::update_midi_clock_port()
66 _midi_port = MIDI::Manager::instance()->midi_clock_output_port();
69 void MidiClockTicker::transport_state_changed()
71 if (_session->exporting()) {
72 /* no midi clock during export, for now */
76 float speed = _session->transport_speed();
77 framepos_t position = _session->transport_frame();
78 #ifdef DEBUG_MIDI_CLOCK
79 cerr << "Transport state change, speed:" << speed << "position:" << position<< " play loop " << _session->get_play_loop() << endl;
82 _last_tick = position;
84 if (!Config->get_send_midi_clock())
87 if (_session->get_play_loop()) {
88 assert(_session->locations()->auto_loop_location());
89 if (position == _session->locations()->auto_loop_location()->start()) {
92 send_continue_event(0);
94 } else if (position == 0) {
97 send_continue_event(0);
100 send_midi_clock_event(0);
102 } else if (speed == 0.0f) {
103 if (!Config->get_send_midi_clock())
109 tick(position, *((ARDOUR::BBT_Time *) 0), *((Timecode::Time *)0));
112 void MidiClockTicker::position_changed (framepos_t position)
114 #ifdef DEBUG_MIDI_CLOCK
115 cerr << "Position changed:" << position << endl;
117 _last_tick = position;
120 void MidiClockTicker::transport_looped()
122 Location* loop_location = _session->locations()->auto_loop_location();
123 assert(loop_location);
125 #ifdef DEBUG_MIDI_CLOCK
126 cerr << "Transport looped, position:" << _session->transport_frame()
127 << " loop start " << loop_location->start( )
128 << " loop end " << loop_location->end( )
129 << " play loop " << _session->get_play_loop()
133 // adjust _last_tick, so that the next MIDI clock message is sent
134 // in due time (and the tick interval is still constant)
135 framecnt_t elapsed_since_last_tick = loop_location->end() - _last_tick;
136 _last_tick = loop_location->start() - elapsed_since_last_tick;
139 void MidiClockTicker::tick (const framepos_t& transport_frames, const BBT_Time& /*transport_bbt*/, const Timecode::Time& /*transport_smpt*/)
141 if (!Config->get_send_midi_clock() || _session == 0 || _session->transport_speed() != 1.0f || _midi_port == 0)
145 double next_tick = _last_tick + one_ppqn_in_frames(transport_frames);
146 framecnt_t next_tick_offset = framecnt_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:" << _midi_port->nframes_this_cycle()
157 if (next_tick_offset >= _midi_port->nframes_this_cycle())
160 send_midi_clock_event(next_tick_offset);
162 _last_tick = next_tick;
166 double MidiClockTicker::one_ppqn_in_frames (framepos_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 (pframes_t offset)
186 DEBUG_TRACE (PBD::DEBUG::MidiClock, string_compose ("Tick with offset %1", offset));
188 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CLOCK };
189 _midi_port->write (_midi_clock_tick, 1, offset);
192 void MidiClockTicker::send_start_event (pframes_t offset)
198 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_START };
199 _midi_port->write (_midi_clock_tick, 1, offset);
202 void MidiClockTicker::send_continue_event (pframes_t offset)
208 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CONTINUE };
209 _midi_port->write (_midi_clock_tick, 1, offset);
212 void MidiClockTicker::send_stop_event (pframes_t offset)
218 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_STOP };
219 _midi_port->write (_midi_clock_tick, 1, offset);