2 Copyright (C) 1999-2002 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.
26 #include <boost/shared_ptr.hpp>
28 #include <glibmm/main.h>
30 #include "midi++/mmc.h"
31 #include "midi++/port.h"
32 #include "midi++/manager.h"
34 #include "pbd/error.h"
35 #include "pbd/pthread_utils.h"
37 #include "timecode/time.h"
39 #include "ardour/audio_track.h"
40 #include "ardour/audioengine.h"
41 #include "ardour/debug.h"
42 #include "ardour/midi_track.h"
43 #include "ardour/midi_ui.h"
44 #include "ardour/session.h"
45 #include "ardour/slave.h"
50 using namespace ARDOUR;
59 boost::shared_ptr<RouteList> r = routes.reader ();
61 for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
62 MidiTrack *track = dynamic_cast<MidiTrack*>((*i).get());
71 Session::setup_midi_control ()
73 outbound_mtc_timecode_frame = 0;
74 next_quarter_frame_to_send = 0;
76 /* Set up the qtr frame message */
91 if (Config->get_mmc_control ()) {
92 request_transport_speed (1.0);
97 Session::spp_continue ()
105 if (Config->get_mmc_control ()) {
111 Session::mmc_deferred_play (MIDI::MachineControl &/*mmc*/)
113 if (Config->get_mmc_control ()) {
114 request_transport_speed (1.0);
119 Session::mmc_record_pause (MIDI::MachineControl &/*mmc*/)
121 if (Config->get_mmc_control ()) {
122 maybe_enable_record();
127 Session::mmc_record_strobe (MIDI::MachineControl &/*mmc*/)
129 if (!Config->get_mmc_control() || (_step_editors > 0)) {
133 /* record strobe does an implicit "Play" command */
135 if (_transport_speed != 1.0) {
137 /* start_transport() will move from Enabled->Recording, so we
138 don't need to do anything here except enable recording.
139 its not the same as maybe_enable_record() though, because
140 that *can* switch to Recording, which we do not want.
143 save_state ("", true);
144 g_atomic_int_set (&_record_status, Enabled);
145 RecordStateChanged (); /* EMIT SIGNAL */
147 request_transport_speed (1.0);
156 Session::mmc_record_exit (MIDI::MachineControl &/*mmc*/)
158 if (Config->get_mmc_control ()) {
159 disable_record (false);
164 Session::mmc_stop (MIDI::MachineControl &/*mmc*/)
166 if (Config->get_mmc_control ()) {
172 Session::mmc_pause (MIDI::MachineControl &/*mmc*/)
174 if (Config->get_mmc_control ()) {
176 /* We support RECORD_PAUSE, so the spec says that
177 we must interpret PAUSE like RECORD_PAUSE if
181 if (actively_recording()) {
182 maybe_enable_record ();
189 static bool step_queued = false;
192 Session::mmc_step (MIDI::MachineControl &/*mmc*/, int steps)
194 if (!Config->get_mmc_control ()) {
199 struct timeval diff = { 0, 0 };
201 gettimeofday (&now, 0);
203 timersub (&now, &last_mmc_step, &diff);
205 gettimeofday (&now, 0);
206 timersub (&now, &last_mmc_step, &diff);
208 if (last_mmc_step.tv_sec != 0 && (diff.tv_usec + (diff.tv_sec * 1000000)) < _engine.usecs_per_cycle()) {
212 double diff_secs = diff.tv_sec + (diff.tv_usec / 1000000.0);
213 double cur_speed = (((steps * 0.5) * timecode_frames_per_second()) / diff_secs) / timecode_frames_per_second();
215 if (_transport_speed == 0 || cur_speed * _transport_speed < 0) {
216 /* change direction */
217 step_speed = cur_speed;
219 step_speed = (0.6 * step_speed) + (0.4 * cur_speed);
225 cerr << "delta = " << diff_secs
226 << " ct = " << _transport_speed
227 << " steps = " << steps
228 << " new speed = " << cur_speed
229 << " speed = " << step_speed
233 request_transport_speed_nonzero (step_speed);
237 if (midi_control_ui) {
238 RefPtr<TimeoutSource> tsrc = TimeoutSource::create (100);
239 tsrc->connect (sigc::mem_fun (*this, &Session::mmc_step_timeout));
240 tsrc->attach (midi_control_ui->main_loop()->get_context());
247 Session::mmc_rewind (MIDI::MachineControl &/*mmc*/)
249 if (Config->get_mmc_control ()) {
250 request_transport_speed(-8.0f);
255 Session::mmc_fast_forward (MIDI::MachineControl &/*mmc*/)
257 if (Config->get_mmc_control ()) {
258 request_transport_speed(8.0f);
263 Session::mmc_locate (MIDI::MachineControl &/*mmc*/, const MIDI::byte* mmc_tc)
265 if (!Config->get_mmc_control ()) {
269 framepos_t target_frame;
270 Timecode::Time timecode;
272 timecode.hours = mmc_tc[0] & 0xf;
273 timecode.minutes = mmc_tc[1];
274 timecode.seconds = mmc_tc[2];
275 timecode.frames = mmc_tc[3];
276 timecode.rate = timecode_frames_per_second();
277 timecode.drop = timecode_drop_frames();
279 // Also takes timecode offset into account:
280 timecode_to_sample( timecode, target_frame, true /* use_offset */, false /* use_subframes */ );
282 if (target_frame > max_framepos) {
283 target_frame = max_framepos;
286 /* Some (all?) MTC/MMC devices do not send a full MTC frame
287 at the end of a locate, instead sending only an MMC
288 locate command. This causes the current position
289 of an MTC slave to become out of date. Catch this.
292 MTC_Slave* mtcs = dynamic_cast<MTC_Slave*> (_slave);
295 // cerr << "Locate *with* MTC slave\n";
296 mtcs->handle_locate (mmc_tc);
298 // cerr << "Locate without MTC slave\n";
299 request_locate (target_frame, false);
304 Session::mmc_shuttle (MIDI::MachineControl &/*mmc*/, float speed, bool forw)
306 if (!Config->get_mmc_control ()) {
310 if (Config->get_shuttle_speed_threshold() >= 0 && speed > Config->get_shuttle_speed_threshold()) {
311 speed *= Config->get_shuttle_speed_factor();
315 request_transport_speed_nonzero (speed);
317 request_transport_speed_nonzero (-speed);
322 Session::mmc_record_enable (MIDI::MachineControl &mmc, size_t trk, bool enabled)
324 if (!Config->get_mmc_control ()) {
328 RouteList::iterator i;
329 boost::shared_ptr<RouteList> r = routes.reader();
331 for (i = r->begin(); i != r->end(); ++i) {
334 if ((at = dynamic_cast<AudioTrack*>((*i).get())) != 0) {
335 if (trk == at->remote_control_id()) {
336 at->set_record_enabled (enabled, &mmc);
343 /** Send MTC Full Frame message (complete Timecode time) for the start of this cycle.
344 * This resets the MTC code, the next quarter frame message that is sent will be
345 * the first one with the beginning of this cycle as the new start point.
346 * @param t time to send.
349 Session::send_full_time_code (framepos_t const t)
351 /* This function could easily send at a given frame offset, but would
352 * that be useful? Does ardour do sub-block accurate locating? [DR] */
355 Timecode::Time timecode;
357 _send_timecode_update = false;
359 if (_engine.freewheeling() || !Config->get_send_mtc()) {
362 if (_slave && !_slave->locked()) {
366 // Get timecode time for the given time
367 sample_to_timecode (t, timecode, true /* use_offset */, false /* no subframes */);
369 // sample-align outbound to rounded (no subframes) timecode
371 timecode_to_sample(timecode, mtc_tc, true, false);
372 outbound_mtc_timecode_frame = mtc_tc;
374 transmitting_timecode_time = timecode;
376 double const quarter_frame_duration = ((framecnt_t) _frames_per_timecode_frame) / 4.0;
377 if (ceil((t - mtc_tc) / quarter_frame_duration) > 0) {
378 Timecode::increment (transmitting_timecode_time, config.get_subframes_per_frame());
379 outbound_mtc_timecode_frame += _frames_per_timecode_frame;
382 DEBUG_TRACE (DEBUG::MTC, string_compose ("Full MTC TC %1\n", outbound_mtc_timecode_frame));
384 // I don't understand this bit yet.. [DR]
386 // according to MTC spec 24, 30 drop and 30 non-drop TC, the frame-number represented by 8 quarter frames must be even.
387 if (((mtc_timecode_bits >> 5) != MIDI::MTC_25_FPS) && (transmitting_timecode_time.frames % 2)) {
388 // start MTC quarter frame transmission on an even frame
389 Timecode::increment (transmitting_timecode_time, config.get_subframes_per_frame());
390 outbound_mtc_timecode_frame += _frames_per_timecode_frame;
393 #if 0 // compensate for audio latency -- disabled [rg]
394 /* this needs more thought and work.
395 * the proper solution will be to just offset MTC by the MIDI port's latency.
397 * using worst_playback_latency() is wrong when the generated MTC is used to sync
398 * clients which send audio to Ardour for recording.
399 * worst_capture_latency() vs. worst_playback_latency()
401 * NB. similarly to session_ltc, the offset should be subtracted from the timecode to send,
402 * instead of being added to timestamp when to send the timecode.
403 * Otherwise the timestamp may not fall into the jack-cycle of the current _transport frame.
404 * and no MTC QF will be sent.
406 outbound_mtc_timecode_frame += worst_playback_latency();
408 next_quarter_frame_to_send = 0;
410 // Sync slave to the same Timecode time as we are on
418 msg[5] = mtc_timecode_bits | timecode.hours;
419 msg[6] = timecode.minutes;
420 msg[7] = timecode.seconds;
421 msg[8] = timecode.frames;
423 // Send message at offset 0, sent time is for the start of this cycle
424 if (MIDI::Manager::instance()->mtc_output_port()->midimsg (msg, sizeof (msg), 0)) {
425 error << _("Session: could not send full MIDI time code") << endmsg;
429 _pframes_since_last_mtc = 0;
433 /** Send MTC (quarter-frame) messages for this cycle.
434 * Must be called exactly once per cycle from the process thread. Realtime safe.
435 * This function assumes the state of full Timecode is sane, eg. the slave is
436 * expecting quarter frame messages and has the right frame of reference (any
437 * full MTC Timecode time messages that needed to be sent should have been sent
438 * earlier already this cycle by send_full_time_code)
441 Session::send_midi_time_code_for_cycle (framepos_t start_frame, framepos_t end_frame, pframes_t nframes)
443 if (_engine.freewheeling() || !_send_qf_mtc || transmitting_timecode_time.negative || (next_quarter_frame_to_send < 0)) {
444 // cerr << "(MTC) Not sending MTC\n";
447 if (_slave && !_slave->locked()) {
451 /* MTC is max. 30 fps - assert() below will fail
452 * TODO actually limit it to 24,25,29df,30fps
453 * talk to oofus, first.
455 if (Timecode::timecode_to_frames_per_second(config.get_timecode_format()) > 30) {
459 assert (next_quarter_frame_to_send >= 0);
460 assert (next_quarter_frame_to_send <= 7);
462 /* Duration of one quarter frame */
463 double const quarter_frame_duration = _frames_per_timecode_frame / 4.0;
465 DEBUG_TRACE (DEBUG::MTC, string_compose ("TF %1 SF %2 MT %3 QF %4 QD %5\n",
466 _transport_frame, start_frame, outbound_mtc_timecode_frame,
467 next_quarter_frame_to_send, quarter_frame_duration));
469 if (rint(outbound_mtc_timecode_frame + (next_quarter_frame_to_send * quarter_frame_duration)) < _transport_frame) {
470 send_full_time_code (_transport_frame);
474 /* Send quarter frames for this cycle */
475 while (end_frame > rint(outbound_mtc_timecode_frame + (next_quarter_frame_to_send * quarter_frame_duration))) {
477 DEBUG_TRACE (DEBUG::MTC, string_compose ("next frame to send: %1\n", next_quarter_frame_to_send));
479 switch (next_quarter_frame_to_send) {
481 mtc_msg[1] = 0x00 | (transmitting_timecode_time.frames & 0xf);
484 mtc_msg[1] = 0x10 | ((transmitting_timecode_time.frames & 0xf0) >> 4);
487 mtc_msg[1] = 0x20 | (transmitting_timecode_time.seconds & 0xf);
490 mtc_msg[1] = 0x30 | ((transmitting_timecode_time.seconds & 0xf0) >> 4);
493 mtc_msg[1] = 0x40 | (transmitting_timecode_time.minutes & 0xf);
496 mtc_msg[1] = 0x50 | ((transmitting_timecode_time.minutes & 0xf0) >> 4);
499 mtc_msg[1] = 0x60 | ((mtc_timecode_bits | transmitting_timecode_time.hours) & 0xf);
502 mtc_msg[1] = 0x70 | (((mtc_timecode_bits | transmitting_timecode_time.hours) & 0xf0) >> 4);
506 const framepos_t msg_time = rint(outbound_mtc_timecode_frame + (quarter_frame_duration * next_quarter_frame_to_send));
508 // This message must fall within this block or something is broken
509 assert (msg_time >= start_frame);
510 assert (msg_time < end_frame);
512 /* convert from session frames back to JACK frames using the transport speed */
513 pframes_t const out_stamp = (msg_time - start_frame) / _transport_speed;
514 assert (out_stamp < nframes);
516 if (MIDI::Manager::instance()->mtc_output_port()->midimsg (mtc_msg, 2, out_stamp)) {
517 error << string_compose(_("Session: cannot send quarter-frame MTC message (%1)"), strerror (errno))
524 DEBUG_STR_APPEND(foo,"sending ");
525 DEBUG_STR_APPEND(foo, transmitting_timecode_time);
526 DEBUG_TRACE (DEBUG::MTC, string_compose ("%1 qfm = %2, stamp = %3\n", DEBUG_STR(foo).str(), next_quarter_frame_to_send,
530 // Increment quarter frame counter
531 next_quarter_frame_to_send++;
533 if (next_quarter_frame_to_send >= 8) {
534 // Wrap quarter frame counter
535 next_quarter_frame_to_send = 0;
536 // Increment timecode time twice
537 Timecode::increment (transmitting_timecode_time, config.get_subframes_per_frame());
538 Timecode::increment (transmitting_timecode_time, config.get_subframes_per_frame());
539 // Re-calculate timing of first quarter frame
540 //timecode_to_sample( transmitting_timecode_time, outbound_mtc_timecode_frame, true /* use_offset */, false );
541 outbound_mtc_timecode_frame += 2.0 * _frames_per_timecode_frame;
548 /***********************************************************************
550 **********************************************************************/
554 Session::mmc_step_timeout ()
559 gettimeofday (&now, 0);
561 timersub (&now, &last_mmc_step, &diff);
562 diff_usecs = diff.tv_sec * 1000000 + diff.tv_usec;
564 if (diff_usecs > 1000000.0 || fabs (_transport_speed) < 0.0000001) {
565 /* too long or too slow, stop transport */
566 request_transport_speed (0.0);
571 if (diff_usecs < 250000.0) {
572 /* too short, just keep going */
578 request_transport_speed_nonzero (_transport_speed * 0.75);
583 Session::start_midi_thread ()
585 midi_control_ui = new MidiControlUI (*this);
586 midi_control_ui->run ();