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 using namespace ARDOUR;
31 void Ticker::set_session (Session* s)
33 SessionHandlePtr::set_session (s);
36 _session->tick.connect_same_thread (_session_connections, boost::bind (&Ticker::tick, this, _1, _2, _3));
40 void MidiClockTicker::set_session (Session* s)
42 Ticker::set_session (s);
45 _session->TransportStateChange.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::transport_state_changed, this));
46 _session->PositionChanged.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::position_changed, this, _1));
47 _session->TransportLooped.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::transport_looped, this));
48 update_midi_clock_port();
53 MidiClockTicker::session_going_away ()
55 SessionHandlePtr::session_going_away();
59 void MidiClockTicker::update_midi_clock_port()
61 _midi_port = MIDI::Manager::instance()->midi_clock_output_port();
64 void MidiClockTicker::transport_state_changed()
66 if (_session->exporting()) {
67 /* no midi clock during export, for now */
71 float speed = _session->transport_speed();
72 framepos_t position = _session->transport_frame();
74 DEBUG_TRACE (PBD::DEBUG::MidiClock,
75 string_compose ("Transport state change, speed: %1 position: %2 play loop: %3\n", speed, position, _session->get_play_loop())
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 (framepos_t position)
111 DEBUG_TRACE (PBD::DEBUG::MidiClock, string_compose ("Position change: %1\n", position));
113 _last_tick = position;
116 void MidiClockTicker::transport_looped()
118 Location* loop_location = _session->locations()->auto_loop_location();
119 assert(loop_location);
121 DEBUG_TRACE (PBD::DEBUG::MidiClock,
122 string_compose ("Transport looped, position: %1, loop start: %2, loop end: %3, play loop: %4\n",
123 _session->transport_frame(), loop_location->start(), loop_location->end(), _session->get_play_loop())
126 // adjust _last_tick, so that the next MIDI clock message is sent
127 // in due time (and the tick interval is still constant)
128 framecnt_t elapsed_since_last_tick = loop_location->end() - _last_tick;
129 _last_tick = loop_location->start() - elapsed_since_last_tick;
132 void MidiClockTicker::tick (const framepos_t& transport_frames, const BBT_Time& /*transport_bbt*/, const Timecode::Time& /*transport_smpt*/)
134 if (!Config->get_send_midi_clock() || _session == 0 || _session->transport_speed() != 1.0f || _midi_port == 0)
138 double next_tick = _last_tick + one_ppqn_in_frames(transport_frames);
139 framecnt_t next_tick_offset = framecnt_t(next_tick) - transport_frames;
141 DEBUG_TRACE (PBD::DEBUG::MidiClock,
142 string_compose ("Transport: %1, last tick time: %2, next tick time: %3, offset: %4, cycle length: %5\n",
143 transport_frames, _last_tick, next_tick, next_tick_offset, _midi_port->nframes_this_cycle()
147 if (next_tick_offset >= _midi_port->nframes_this_cycle())
150 send_midi_clock_event(next_tick_offset);
152 _last_tick = next_tick;
156 double MidiClockTicker::one_ppqn_in_frames (framepos_t transport_position)
158 const Tempo& current_tempo = _session->tempo_map().tempo_at(transport_position);
159 const Meter& current_meter = _session->tempo_map().meter_at(transport_position);
160 double frames_per_beat =
161 current_tempo.frames_per_beat(_session->nominal_frame_rate(),
164 double quarter_notes_per_beat = 4.0 / current_tempo.note_type();
165 double frames_per_quarter_note = frames_per_beat / quarter_notes_per_beat;
167 return frames_per_quarter_note / double (_ppqn);
170 void MidiClockTicker::send_midi_clock_event (pframes_t offset)
176 DEBUG_TRACE (PBD::DEBUG::MidiClock, string_compose ("Tick with offset %1\n", offset));
178 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CLOCK };
179 _midi_port->write (_midi_clock_tick, 1, offset);
182 void MidiClockTicker::send_start_event (pframes_t offset)
188 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_START };
189 _midi_port->write (_midi_clock_tick, 1, offset);
192 void MidiClockTicker::send_continue_event (pframes_t offset)
198 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CONTINUE };
199 _midi_port->write (_midi_clock_tick, 1, offset);
202 void MidiClockTicker::send_stop_event (pframes_t offset)
208 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_STOP };
209 _midi_port->write (_midi_clock_tick, 1, offset);