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++/jack_midi_port.h"
24 #include "midi++/manager.h"
26 #include "evoral/midi_events.h"
28 #include "ardour/audioengine.h"
29 #include "ardour/ticker.h"
30 #include "ardour/session.h"
31 #include "ardour/tempo.h"
32 #include "ardour/debug.h"
34 using namespace ARDOUR;
36 MidiClockTicker::MidiClockTicker ()
43 void MidiClockTicker::set_session (Session* s)
45 SessionHandlePtr::set_session (s);
48 _session->TransportStateChange.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::transport_state_changed, this));
49 _session->PositionChanged.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::position_changed, this, _1));
50 _session->TransportLooped.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::transport_looped, this));
51 update_midi_clock_port();
56 MidiClockTicker::session_going_away ()
58 SessionHandlePtr::session_going_away();
62 void MidiClockTicker::update_midi_clock_port()
64 _midi_port = MIDI::Manager::instance()->midi_clock_output_port();
67 void MidiClockTicker::transport_state_changed()
69 if (_session->exporting()) {
70 /* no midi clock during export, for now */
74 if (!_session->engine().running()) {
75 /* Engine stopped, we can't do anything */
79 float speed = _session->transport_speed();
80 framepos_t position = _session->transport_frame();
82 DEBUG_TRACE (PBD::DEBUG::MidiClock,
83 string_compose ("Transport state change @ %4, speed: %1 position: %2 play loop: %3\n", speed, position, _session->get_play_loop(), position)
87 _last_tick = position;
89 if (!Config->get_send_midi_clock())
92 if (_session->get_play_loop()) {
93 assert(_session->locations()->auto_loop_location());
94 if (position == _session->locations()->auto_loop_location()->start()) {
97 send_continue_event(0);
99 } else if (position == 0) {
102 send_continue_event(0);
105 send_midi_clock_event(0);
107 } else if (speed == 0.0f) {
108 if (!Config->get_send_midi_clock())
117 void MidiClockTicker::position_changed (framepos_t position)
119 DEBUG_TRACE (PBD::DEBUG::MidiClock, string_compose ("Position change: %1\n", position));
121 _last_tick = position;
124 void MidiClockTicker::transport_looped()
126 Location* loop_location = _session->locations()->auto_loop_location();
127 assert(loop_location);
129 DEBUG_TRACE (PBD::DEBUG::MidiClock,
130 string_compose ("Transport looped, position: %1, loop start: %2, loop end: %3, play loop: %4\n",
131 _session->transport_frame(), loop_location->start(), loop_location->end(), _session->get_play_loop())
134 // adjust _last_tick, so that the next MIDI clock message is sent
135 // in due time (and the tick interval is still constant)
137 framecnt_t elapsed_since_last_tick = loop_location->end() - _last_tick;
139 if (loop_location->start() > elapsed_since_last_tick) {
140 _last_tick = loop_location->start() - elapsed_since_last_tick;
146 void MidiClockTicker::tick (const framepos_t& transport_frame)
148 if (!Config->get_send_midi_clock() || _session == 0 || _session->transport_speed() != 1.0f || _midi_port == 0) {
153 double next_tick = _last_tick + one_ppqn_in_frames (transport_frame);
154 frameoffset_t next_tick_offset = llrint (next_tick) - transport_frame;
156 MIDI::JackMIDIPort* mp = dynamic_cast<MIDI::JackMIDIPort*> (_midi_port);
158 DEBUG_TRACE (PBD::DEBUG::MidiClock,
159 string_compose ("Transport: %1, last tick time: %2, next tick time: %3, offset: %4, cycle length: %5\n",
160 transport_frame, _last_tick, next_tick, next_tick_offset, mp ? mp->nframes_this_cycle() : 0));
162 if (!mp || (next_tick_offset >= mp->nframes_this_cycle())) {
166 if (next_tick_offset >= 0) {
167 send_midi_clock_event (next_tick_offset);
170 _last_tick = next_tick;
174 double MidiClockTicker::one_ppqn_in_frames (framepos_t transport_position)
176 const Tempo& current_tempo = _session->tempo_map().tempo_at (transport_position);
177 double frames_per_beat = current_tempo.frames_per_beat (_session->nominal_frame_rate());
179 double quarter_notes_per_beat = 4.0 / current_tempo.note_type();
180 double frames_per_quarter_note = frames_per_beat / quarter_notes_per_beat;
182 return frames_per_quarter_note / double (_ppqn);
185 void MidiClockTicker::send_midi_clock_event (pframes_t offset)
191 DEBUG_TRACE (PBD::DEBUG::MidiClock, string_compose ("Tick with offset %1\n", offset));
193 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CLOCK };
194 _midi_port->write (_midi_clock_tick, 1, offset);
197 void MidiClockTicker::send_start_event (pframes_t offset)
203 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_START };
204 _midi_port->write (_midi_clock_tick, 1, offset);
207 void MidiClockTicker::send_continue_event (pframes_t offset)
213 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CONTINUE };
214 _midi_port->write (_midi_clock_tick, 1, offset);
217 void MidiClockTicker::send_stop_event (pframes_t offset)
223 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_STOP };
224 _midi_port->write (_midi_clock_tick, 1, offset);