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;
37 /** MIDI Clock Position tracking */
38 class MidiClockTicker::Position : public Timecode::BBT_Time
42 Position() : speed(0.0f), frame(0), clocks_till_locate(-1) { }
45 /** Sync timing information taken from the given Session
46 @return True if timings differed */
47 bool sync (Session* s) {
51 double sp = s->transport_speed();
52 framecnt_t fr = s->transport_frame();
61 s->bbt_time (fr, *this);
63 const TempoMap& tempo = s->tempo_map();
65 const double divisions = tempo.meter_at(frame).divisions_per_bar();
66 const double divisor = tempo.meter_at(frame).note_divisor();
67 const double qnote_scale = divisor * 0.25f;
71 /* Midi Beats in terms of Song Position Pointer is equivalent to total
72 sixteenth notes at 'time' */
74 midi_beats = (((bars - 1) * divisions) + beats - 1);
75 midi_beats += (double)ticks / (double)Position::ticks_per_beat * qnote_scale;
76 midi_beats *= 16.0f / divisor;
78 midi_clocks = midi_beats * 6.0f;
93 void print (std::ostream& s) {
94 s << "MCLK Position: frames: " << frame << " midi beats: " << midi_beats << " speed: " << speed << std::endl;
99 MidiClockTicker::MidiClockTicker ()
104 _pos = new Position();
107 MidiClockTicker::~MidiClockTicker()
117 MidiClockTicker::set_session (Session* s)
119 SessionHandlePtr::set_session (s);
122 _session->TransportStateChange.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::transport_state_changed, this));
123 _session->PositionChanged.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::position_changed, this, _1));
124 _session->TransportLooped.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::transport_looped, this));
125 _session->Located.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::session_located, this));
127 update_midi_clock_port();
128 _pos->sync (_session);
133 MidiClockTicker::session_located()
135 if (0 == _session || ! _pos->sync (_session)) {
139 _last_tick = _pos->frame;
141 // WIP - Testing code
142 if (0 == _pos->frame) {
143 std::clog << "zero frame\n";
144 if (1.0f == _pos->speed) {
145 std::clog << "normal speed:\n";
146 _pos->clocks_till_locate = 0;
152 MidiClockTicker::session_going_away ()
154 SessionHandlePtr::session_going_away();
159 MidiClockTicker::update_midi_clock_port()
161 _midi_port = MIDI::Manager::instance()->midi_clock_output_port();
165 MidiClockTicker::transport_state_changed()
167 if (_session->exporting()) {
168 /* no midi clock during export, for now */
172 if (!_session->engine().running()) {
173 /* Engine stopped, we can't do anything */
177 float speed = _session->transport_speed();
178 framepos_t position = _session->transport_frame();
180 DEBUG_TRACE (PBD::DEBUG::MidiClock,
181 string_compose ("Transport state change @ %4, speed: %1 position: %2 play loop: %3\n", speed, position, _session->get_play_loop(), position)
185 _last_tick = position;
187 if (!Config->get_send_midi_clock())
190 if (_session->get_play_loop()) {
191 assert(_session->locations()->auto_loop_location());
192 if (position == _session->locations()->auto_loop_location()->start()) {
195 send_continue_event(0);
197 } else if (position == 0) {
200 send_continue_event(0);
203 send_midi_clock_event(0);
205 } else if (speed == 0.0f) {
206 if (!Config->get_send_midi_clock())
210 send_position_event (position, 0);
217 MidiClockTicker::position_changed (framepos_t position)
219 const double speed = _session->transport_speed();
220 DEBUG_TRACE (PBD::DEBUG::MidiClock, string_compose ("Transport Position Change: %1, speed: %2\n", position, speed));
222 if (speed == 0.0f && Config->get_send_midi_clock()) {
223 send_position_event (position, 0);
226 _last_tick = position;
230 MidiClockTicker::transport_looped()
232 Location* loop_location = _session->locations()->auto_loop_location();
233 assert(loop_location);
235 DEBUG_TRACE (PBD::DEBUG::MidiClock,
236 string_compose ("Transport looped, position: %1, loop start: %2, loop end: %3, play loop: %4\n",
237 _session->transport_frame(), loop_location->start(), loop_location->end(), _session->get_play_loop())
240 // adjust _last_tick, so that the next MIDI clock message is sent
241 // in due time (and the tick interval is still constant)
243 framecnt_t elapsed_since_last_tick = loop_location->end() - _last_tick;
245 if (loop_location->start() > elapsed_since_last_tick) {
246 _last_tick = loop_location->start() - elapsed_since_last_tick;
253 MidiClockTicker::tick (const framepos_t& transport_frame)
255 if (_pos->clocks_till_locate == 0) {
256 std::clog << "Locate: " << transport_frame << std::endl;
259 --_pos->clocks_till_locate;
261 if (!Config->get_send_midi_clock() || _session == 0 || _session->transport_speed() != 1.0f || _midi_port == 0) {
266 double next_tick = _last_tick + one_ppqn_in_frames (transport_frame);
267 frameoffset_t next_tick_offset = llrint (next_tick) - transport_frame;
270 MIDI::JackMIDIPort* mp = dynamic_cast<MIDI::JackMIDIPort*> (_midi_port);
273 DEBUG_TRACE (PBD::DEBUG::MidiClock,
274 string_compose ("Transport: %1, last tick time: %2, next tick time: %3, offset: %4, cycle length: %5\n",
275 transport_frame, _last_tick, next_tick, next_tick_offset, mp ? mp->nframes_this_cycle() : 0));
278 if (!mp || (next_tick_offset >= mp->nframes_this_cycle())) {
282 if (next_tick_offset >= 0) {
283 send_midi_clock_event (next_tick_offset);
286 _pos->frame = _last_tick = next_tick;
291 MidiClockTicker::one_ppqn_in_frames (framepos_t transport_position)
293 const Tempo& current_tempo = _session->tempo_map().tempo_at (transport_position);
294 double frames_per_beat = current_tempo.frames_per_beat (_session->nominal_frame_rate());
296 double quarter_notes_per_beat = 4.0 / current_tempo.note_type();
297 double frames_per_quarter_note = frames_per_beat / quarter_notes_per_beat;
299 return frames_per_quarter_note / double (_ppqn);
303 MidiClockTicker::send_midi_clock_event (pframes_t offset)
309 // DEBUG_TRACE (PBD::DEBUG::MidiClock, string_compose ("Tick with offset %1\n", offset));
311 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CLOCK };
312 _midi_port->write (_midi_clock_tick, 1, offset);
316 MidiClockTicker::send_start_event (pframes_t offset)
322 DEBUG_TRACE (PBD::DEBUG::MidiClock, string_compose ("Start %1\n", _last_tick));
324 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_START };
325 _midi_port->write (_midi_clock_tick, 1, offset);
329 MidiClockTicker::send_continue_event (pframes_t offset)
335 DEBUG_TRACE (PBD::DEBUG::MidiClock, string_compose ("Continue %1\n", _last_tick));
337 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CONTINUE };
338 _midi_port->write (_midi_clock_tick, 1, offset);
342 MidiClockTicker::send_stop_event (pframes_t offset)
348 DEBUG_TRACE (PBD::DEBUG::MidiClock, string_compose ("Stop %1\n", _last_tick));
350 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_STOP };
351 _midi_port->write (_midi_clock_tick, 1, offset);
355 MidiClockTicker::send_position_event (framepos_t transport_position, pframes_t offset)
357 if (_midi_port == 0 || _session == 0 || _session->engine().freewheeling()) {
361 const TempoMap& tempo = _session->tempo_map();
363 Timecode::BBT_Time time;
364 _session->bbt_time (transport_position, time);
365 const double beats_per_bar = tempo.meter_at(transport_position).divisions_per_bar();
367 /* Midi Beats in terms of Song Position Pointer is equivalent to total
368 sixteenth notes at 'time' */
369 const uint32_t midi_beats = 4 * (((time.bars - 1) * beats_per_bar) + time.beats - 1);
371 /* can only use 14bits worth */
372 if (midi_beats > 0x3fff) {
376 /* split midi beats into a 14bit value */
377 MIDI::byte msg[3] = {
378 MIDI_CMD_COMMON_SONG_POS,
383 DEBUG_TRACE (PBD::DEBUG::MidiClock, string_compose ("Song Position: %1\n", midi_beats));
385 _midi_port->midimsg (msg, sizeof (msg), offset);