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 "ardour/ticker.h"
22 #include "ardour/session.h"
23 #include "ardour/tempo.h"
29 void Ticker::set_session(Session& s)
34 _session->tick.connect(mem_fun (*this, &Ticker::tick));
35 _session->GoingAway.connect(mem_fun (*this, &Ticker::going_away));
39 void MidiClockTicker::set_session(Session& s)
41 Ticker::set_session(s);
44 _session->MIDIClock_PortChanged.connect(mem_fun (*this, &MidiClockTicker::update_midi_clock_port));
45 _session->TransportStateChange .connect(mem_fun (*this, &MidiClockTicker::transport_state_changed));
46 _session->PositionChanged .connect(mem_fun (*this, &MidiClockTicker::position_changed));
47 _session->TransportLooped .connect(mem_fun (*this, &MidiClockTicker::transport_looped));
48 update_midi_clock_port();
52 void MidiClockTicker::update_midi_clock_port()
54 _jack_port = (MIDI::JACK_MidiPort*) _session->midi_clock_port();
57 void MidiClockTicker::transport_state_changed()
59 float speed = _session->transport_speed();
60 nframes_t position = _session->transport_frame();
61 //cerr << "Transport state change, speed:" << speed << "position:" << position << endl;
63 _last_tick = position;
65 if (!Config->get_send_midi_clock())
71 send_continue_event(0);
74 send_midi_clock_event(0);
76 } else if (speed == 0.0f) {
77 if (!Config->get_send_midi_clock())
84 void MidiClockTicker::position_changed(nframes_t position)
86 cerr << "Position changed:" << position << endl;
87 _last_tick = position;
90 void MidiClockTicker::transport_looped()
92 nframes_t position = _session->transport_frame();
94 cerr << "Transport looped, position:" << position << endl;
97 void MidiClockTicker::send_midi_clock_event(nframes_t offset)
99 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CLOCK };
100 _jack_port->write(_midi_clock_tick, 1, offset);
103 void MidiClockTicker::send_start_event(nframes_t offset)
105 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_START };
106 _jack_port->write(_midi_clock_tick, 1, offset);
109 void MidiClockTicker::send_continue_event(nframes_t offset)
111 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CONTINUE };
112 _jack_port->write(_midi_clock_tick, 1, offset);
115 void MidiClockTicker::send_stop_event(nframes_t offset)
117 static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_STOP };
118 _jack_port->write(_midi_clock_tick, 1, offset);
121 void MidiClockTicker::tick(const nframes_t& transport_frames, const BBT_Time& transport_bbt, const SMPTE::Time& transport_smpt)
123 if (!Config->get_send_midi_clock() || _session == 0 || _session->transport_speed() != 1.0f)
126 const Tempo& current_tempo = _session->tempo_map().tempo_at(transport_frames);
127 const Meter& current_meter = _session->tempo_map().meter_at(transport_frames);
128 double frames_per_beat =
129 current_tempo.frames_per_beat(_session->nominal_frame_rate(),
132 double quarter_notes_per_beat = 4.0 / current_tempo.note_type();
133 double frames_per_quarter_note = frames_per_beat / quarter_notes_per_beat;
135 double one_ppqn_in_frames = frames_per_quarter_note / double (_ppqn);
137 double next_tick = _last_tick + one_ppqn_in_frames;
138 nframes_t next_tick_offset = nframes_t(next_tick) - transport_frames;
140 //cerr << "Transport:" << transport_frames << ":Next tick time:" << next_tick << ":" << "Offset:" << next_tick_offset << endl;
142 if (next_tick_offset >= _jack_port->nframes_this_cycle())
145 assert(_jack_port->is_process_thread());
147 send_midi_clock_event(next_tick_offset);
149 _last_tick = next_tick;