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.
19 #include "pbd/compose.h"
20 #include "pbd/stacktrace.h"
22 #include "midi++/port.h"
23 #include "midi++/manager.h"
25 #include "evoral/midi_events.h"
27 #include "ardour/audioengine.h"
28 #include "ardour/ticker.h"
29 #include "ardour/session.h"
30 #include "ardour/tempo.h"
31 #include "ardour/debug.h"
33 using namespace ARDOUR;
35 MidiClockTicker::MidiClockTicker ()
42 void MidiClockTicker::set_session (Session* s)
44 SessionHandlePtr::set_session (s);
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 = MIDI::Manager::instance()->midi_clock_output_port();
66 void MidiClockTicker::transport_state_changed()
68 if (_session->exporting()) {
69 /* no midi clock during export, for now */
73 if (!_session->engine().running()) {
74 /* Engine stopped, we can't do anything */
78 float speed = _session->transport_speed();
79 framepos_t position = _session->transport_frame();
81 DEBUG_TRACE (PBD::DEBUG::MidiClock,
82 string_compose ("Transport state change @ %4, speed: %1 position: %2 play loop: %3\n", speed, position, _session->get_play_loop(), position)
86 _last_tick = position;
88 if (!Config->get_send_midi_clock())
91 if (_session->get_play_loop()) {
92 assert(_session->locations()->auto_loop_location());
93 if (position == _session->locations()->auto_loop_location()->start()) {
96 send_continue_event(0);
98 } else if (position == 0) {
101 send_continue_event(0);
104 send_midi_clock_event(0);
106 } else if (speed == 0.0f) {
107 if (!Config->get_send_midi_clock())
116 void MidiClockTicker::position_changed (framepos_t position)
118 DEBUG_TRACE (PBD::DEBUG::MidiClock, string_compose ("Position change: %1\n", position));
120 _last_tick = position;
123 void MidiClockTicker::transport_looped()
125 Location* loop_location = _session->locations()->auto_loop_location();
126 assert(loop_location);
128 DEBUG_TRACE (PBD::DEBUG::MidiClock,
129 string_compose ("Transport looped, position: %1, loop start: %2, loop end: %3, play loop: %4\n",
130 _session->transport_frame(), loop_location->start(), loop_location->end(), _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)
136 framecnt_t elapsed_since_last_tick = loop_location->end() - _last_tick;
138 if (loop_location->start() > elapsed_since_last_tick) {
139 _last_tick = loop_location->start() - elapsed_since_last_tick;
145 void MidiClockTicker::tick (const framepos_t& transport_frame)
147 if (!Config->get_send_midi_clock() || _session == 0 || _session->transport_speed() != 1.0f || _midi_port == 0) {
152 double next_tick = _last_tick + one_ppqn_in_frames (transport_frame);
153 frameoffset_t next_tick_offset = llrint (next_tick) - transport_frame;
155 DEBUG_TRACE (PBD::DEBUG::MidiClock,
156 string_compose ("Transport: %1, last tick time: %2, next tick time: %3, offset: %4, cycle length: %5\n",
157 transport_frame, _last_tick, next_tick, next_tick_offset, _midi_port->nframes_this_cycle()
161 if (next_tick_offset >= _midi_port->nframes_this_cycle()) {
165 if (next_tick_offset >= 0) {
166 send_midi_clock_event (next_tick_offset);
169 _last_tick = next_tick;
173 double MidiClockTicker::one_ppqn_in_frames (framepos_t transport_position)
175 const Tempo& current_tempo = _session->tempo_map().tempo_at (transport_position);
176 double frames_per_beat = current_tempo.frames_per_beat (_session->nominal_frame_rate());
178 double quarter_notes_per_beat = 4.0 / current_tempo.note_type();
179 double frames_per_quarter_note = frames_per_beat / quarter_notes_per_beat;
181 return frames_per_quarter_note / double (_ppqn);
184 void MidiClockTicker::send_midi_clock_event (pframes_t offset)
190 DEBUG_TRACE (PBD::DEBUG::MidiClock, string_compose ("Tick with offset %1\n", offset));
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 (pframes_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 (pframes_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 (pframes_t offset)
222 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_STOP };
223 _midi_port->write (_midi_clock_tick, 1, offset);