+ if (_session) {
+ _session->TransportStateChange.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::transport_state_changed, this));
+ _session->TransportLooped.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::transport_looped, this));
+ _session->Located.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::session_located, this));
+
+ update_midi_clock_port();
+ _pos->sync (_session);
+ }
+}
+
+void
+MidiClockTicker::session_located()
+{
+ DEBUG_TRACE (DEBUG::MidiClock, string_compose ("Session Located: %1, speed: %2\n", _session->transport_frame(), _session->transport_speed()));
+
+ if (!_session || !_pos->sync (_session)) {
+ return;
+ }
+
+ _last_tick = _pos->frame;
+
+ if (!Config->get_send_midi_clock()) {
+ return;
+ }
+
+ _send_pos = true;
+}
+
+void
+MidiClockTicker::session_going_away ()
+{
+ SessionHandlePtr::session_going_away();
+ _midi_port.reset ();
+}
+
+void
+MidiClockTicker::update_midi_clock_port()
+{
+ _midi_port = _session->midi_clock_output_port();
+}
+
+void
+MidiClockTicker::transport_state_changed()
+{
+ if (_session->exporting()) {
+ /* no midi clock during export, for now */
+ return;
+ }
+
+ if (!_session->engine().running()) {
+ /* Engine stopped, we can't do anything */
+ return;
+ }
+
+ if (! _pos->sync (_session)) {
+ return;
+ }
+
+ DEBUG_TRACE (DEBUG::MidiClock,
+ string_compose ("Transport state change @ %4, speed: %1 position: %2 play loop: %3\n",
+ _pos->speed, _pos->frame, _session->get_play_loop(), _pos->frame)
+ );
+
+ _last_tick = _pos->frame;
+
+ if (! Config->get_send_midi_clock()) {
+ return;
+ }
+
+ _send_state = true;
+
+ // tick (_pos->frame);
+}
+
+void
+MidiClockTicker::transport_looped()
+{
+ Location* loop_location = _session->locations()->auto_loop_location();
+ assert(loop_location);
+
+ DEBUG_TRACE (DEBUG::MidiClock,
+ string_compose ("Transport looped, position: %1, loop start: %2, loop end: %3, play loop: %4\n",
+ _session->transport_frame(), loop_location->start(), loop_location->end(), _session->get_play_loop())
+ );
+
+ // adjust _last_tick, so that the next MIDI clock message is sent
+ // in due time (and the tick interval is still constant)
+
+ framecnt_t elapsed_since_last_tick = loop_location->end() - _last_tick;
+
+ if (loop_location->start() > elapsed_since_last_tick) {
+ _last_tick = loop_location->start() - elapsed_since_last_tick;
+ } else {
+ _last_tick = 0;
+ }
+}
+
+void
+MidiClockTicker::tick (const framepos_t& /* transport_frame */, pframes_t nframes)
+{
+ if (!Config->get_send_midi_clock() || _session == 0 || _midi_port == 0) {
+ return;
+ }
+
+ if (_send_pos) {
+ if (_pos->speed == 0.0f) {
+ send_position_event (llrint (_pos->midi_beats), 0, nframes);
+ } else if (_pos->speed == 1.0f) {
+ send_stop_event (0, nframes);
+
+ if (_pos->frame == 0) {
+ send_start_event (0, nframes);
+ } else {
+ send_position_event (llrint (_pos->midi_beats), 0, nframes);
+ send_continue_event (0, nframes);
+ }
+ } else {
+ /* Varispeed not supported */
+ }
+
+ _send_pos = false;
+ }
+
+
+ if (_send_state) {
+ if (_pos->speed == 1.0f) {
+ if (_session->get_play_loop()) {
+ assert(_session->locations()->auto_loop_location());
+
+ if (_pos->frame == _session->locations()->auto_loop_location()->start()) {
+ send_start_event (0, nframes);
+ } else {
+ send_continue_event (0, nframes);
+ }
+
+ } else if (_pos->frame == 0) {
+ send_start_event (0, nframes);
+ } else {
+ send_continue_event (0, nframes);
+ }
+
+ // send_midi_clock_event (0);
+
+ } else if (_pos->speed == 0.0f) {
+ send_stop_event (0, nframes);
+ send_position_event (llrint (_pos->midi_beats), 0, nframes);
+ }
+
+ _send_state = false;
+ }
+
+ if (_session->transport_speed() != 1.0f) {
+ /* no varispeed support and nothing to do after this if stopped */
+ return;
+ }
+
+ const framepos_t end = _pos->frame + nframes;
+ double iter = _last_tick;
+
+ while (true) {
+ double clock_delta = one_ppqn_in_frames (llrint (iter));
+ double next_tick = iter + clock_delta;
+ frameoffset_t next_tick_offset = llrint (next_tick) - end;
+
+ DEBUG_TRACE (DEBUG::MidiClock,
+ string_compose ("Tick: iter: %1, last tick time: %2, next tick time: %3, offset: %4, cycle length: %5\n",
+ iter, _last_tick, next_tick, next_tick_offset, nframes));
+
+ if (next_tick_offset >= nframes) {
+ break;
+ }
+
+ if (next_tick_offset >= 0) {
+ send_midi_clock_event (next_tick_offset, nframes);
+ }
+
+ iter = next_tick;
+ }
+
+ _last_tick = iter;
+ _pos->frame = end;
+}
+
+double
+MidiClockTicker::one_ppqn_in_frames (framepos_t transport_position)
+{
+ const Tempo& current_tempo = _session->tempo_map().tempo_at (transport_position);
+ double frames_per_beat = current_tempo.frames_per_beat (_session->nominal_frame_rate());
+
+ double quarter_notes_per_beat = 4.0 / current_tempo.note_type();
+ double frames_per_quarter_note = frames_per_beat / quarter_notes_per_beat;
+
+ return frames_per_quarter_note / double (_ppqn);
+}
+
+void
+MidiClockTicker::send_midi_clock_event (pframes_t offset, pframes_t nframes)
+{
+ if (!_midi_port) {
+ return;
+ }
+
+ static uint8_t msg = MIDI_CMD_COMMON_CLOCK;
+
+ MidiBuffer& mb (_midi_port->get_midi_buffer (nframes));
+ mb.push_back (offset, 1, &msg);
+
+ DEBUG_TRACE (DEBUG::MidiClock, string_compose ("Tick with offset %1\n", offset));