2 Copyright (C) 2002-4 Paul Davis
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.
22 #include <sys/types.h>
24 #include <pbd/error.h>
25 #include <pbd/failed_constructor.h>
26 #include <pbd/pthread_utils.h>
28 #include <midi++/port.h>
29 #include <midi++/jack.h>
30 #include <ardour/slave.h>
31 #include <ardour/session.h>
32 #include <ardour/audioengine.h>
33 #include <ardour/cycles.h>
34 #include <ardour/tempo.h>
39 using namespace ARDOUR;
44 MIDIClock_Slave::MIDIClock_Slave (Session& s, MIDI::Port& p, int ppqn)
47 , accumulator_index (0)
48 , average_midi_clock_frame_duration (0.0)
53 for(int i = 0; i < accumulator_size; i++)
57 MIDIClock_Slave::~MIDIClock_Slave()
62 MIDIClock_Slave::rebind (MIDI::Port& p)
64 for (vector<sigc::connection>::iterator i = connections.begin(); i != connections.end(); ++i) {
70 #ifdef DEBUG_MIDI_CLOCK
71 std::cerr << "MIDIClock_Slave: connecting to port " << port->name() << std::endl;
74 connections.push_back (port->input()->timing.connect (mem_fun (*this, &MIDIClock_Slave::update_midi_clock)));
75 connections.push_back (port->input()->start.connect (mem_fun (*this, &MIDIClock_Slave::start)));
76 connections.push_back (port->input()->contineu.connect (mem_fun (*this, &MIDIClock_Slave::contineu)));
77 connections.push_back (port->input()->stop.connect (mem_fun (*this, &MIDIClock_Slave::stop)));
81 MIDIClock_Slave::calculate_one_ppqn_in_frames_at(nframes_t time)
83 const Tempo& current_tempo = session.tempo_map().tempo_at(time);
84 const Meter& current_meter = session.tempo_map().meter_at(time);
85 double frames_per_beat =
86 current_tempo.frames_per_beat(session.nominal_frame_rate(),
89 double quarter_notes_per_beat = 4.0 / current_tempo.note_type();
90 double frames_per_quarter_note = frames_per_beat / quarter_notes_per_beat;
92 one_ppqn_in_frames = frames_per_quarter_note / double (ppqn);
96 MIDIClock_Slave::update_midi_clock (Parser& parser, nframes_t timestamp)
98 nframes_t now = timestamp;
101 read_current (&last);
104 assert(last.timestamp == 0);
105 // let ardour go after first MIDI Clock Event
109 calculate_one_ppqn_in_frames_at(now);
111 // for the first MIDI clock event we don't have any past
112 // data, so we assume a sane tempo
113 if(last.timestamp == 0) {
114 current_midi_clock_frame_duration = one_ppqn_in_frames;
116 current_midi_clock_frame_duration = now - last.timestamp;
119 // moving average over incoming intervals
120 accumulator[accumulator_index++] = current_midi_clock_frame_duration;
121 if(accumulator_index == accumulator_size)
122 accumulator_index = 0;
124 average_midi_clock_frame_duration = 0.0;
125 for(int i = 0; i < accumulator_size; i++)
126 average_midi_clock_frame_duration += accumulator[i];
127 average_midi_clock_frame_duration /= double(accumulator_size);
129 #ifdef DEBUG_MIDI_CLOCK
130 #ifdef WITH_JACK_MIDI
131 JACK_MidiPort* jack_port = dynamic_cast<JACK_MidiPort*>(port);
132 pthread_t process_thread_id = 0;
134 process_thread_id = jack_port->get_process_thread();
138 << " got MIDI Clock message at time " << now
139 << " session time: " << session.engine().frame_time()
140 << " transport position: " << session.transport_frame()
141 << " real delta: " << current_midi_clock_frame_duration
142 << " reference: " << one_ppqn_in_frames
143 << " average: " << average_midi_clock_frame_duration
145 #endif // DEBUG_MIDI_CLOCK
146 #endif // WITH_JACK_MIDI
149 current.position += one_ppqn_in_frames;
150 current_position += one_ppqn_in_frames;
151 current.timestamp = now;
154 last_inbound_frame = now;
158 MIDIClock_Slave::start (Parser& parser, nframes_t timestamp)
161 nframes_t now = timestamp;
163 #ifdef DEBUG_MIDI_CLOCK
164 cerr << "MIDIClock_Slave got start message at time " << now << " session time: " << session.engine().frame_time() << endl;
168 cerr << "Did not start because not locked!" << endl;
172 current_midi_clock_frame_duration = 0;
175 current.position = 0;
176 current_position = 0;
177 current.timestamp = 0;
185 MIDIClock_Slave::contineu (Parser& parser, nframes_t timestamp)
187 #ifdef DEBUG_MIDI_CLOCK
188 std::cerr << "MIDIClock_Slave got continue message" << endl;
190 start(parser, timestamp);
195 MIDIClock_Slave::stop (Parser& parser, nframes_t timestamp)
197 #ifdef DEBUG_MIDI_CLOCK
198 std::cerr << "MIDIClock_Slave got stop message" << endl;
201 current_midi_clock_frame_duration = 0;
204 current.position = 0;
205 current_position = 0;
206 current.timestamp = 0;
214 MIDIClock_Slave::read_current (SafeTime *st) const
219 error << _("MIDI Clock Slave: atomic read of current time failed, sleeping!") << endmsg;
227 } while (st->guard1 != st->guard2);
231 MIDIClock_Slave::locked () const
237 MIDIClock_Slave::ok() const
243 MIDIClock_Slave::starting() const
249 MIDIClock_Slave::stop_if_no_more_clock_events(nframes_t& pos, nframes_t now, SafeTime& last)
251 /* no timecode for 1/4 second ? conclude that its stopped */
252 if (last_inbound_frame &&
253 now > last_inbound_frame &&
254 now - last_inbound_frame > session.frame_rate() / 4) {
255 #ifdef DEBUG_MIDI_CLOCK
256 cerr << "No MIDI Clock frames received for some time, stopping!" << endl;
259 session.request_locate (pos, false);
260 session.request_transport_speed (0);
261 this->stop(*port->input(), now);
270 MIDIClock_Slave::speed_and_position (float& speed, nframes_t& pos)
278 nframes_t now = session.engine().frame_time();
280 read_current (&last);
282 if (stop_if_no_more_clock_events(pos, now, last)) {
285 //cerr << " now: " << now << " last: " << last.timestamp;
288 double speed_double = one_ppqn_in_frames / average_midi_clock_frame_duration;
289 speed = float(speed_double);
290 //cerr << " final speed: " << speed;
292 // calculate position
293 if (now > last.timestamp) {
294 // we are in between MIDI clock messages
295 // so we interpolate position according to speed
296 nframes_t elapsed = now - last.timestamp;
297 pos = nframes_t (current_position + double(elapsed) * speed_double);
299 // A new MIDI clock message has arrived this cycle
300 pos = current_position;
304 cerr << " transport position now: " << session.transport_frame();
305 cerr << " calculated position: " << pos;
313 MIDIClock_Slave::resolution() const
316 return (nframes_t) one_ppqn_in_frames * ppqn;
320 MIDIClock_Slave::reset ()
323 last_inbound_frame = 0;
325 current.position = 0;
326 current_position = 0;
327 current.timestamp = 0;
330 session.request_locate(0, false);