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"
36 #include "pbd/timersub.h"
38 #include "timecode/time.h"
40 #include "ardour/audio_track.h"
41 #include "ardour/audioengine.h"
42 #include "ardour/debug.h"
43 #include "ardour/midi_track.h"
44 #include "ardour/midi_ui.h"
45 #include "ardour/session.h"
46 #include "ardour/slave.h"
51 using namespace ARDOUR;
60 boost::shared_ptr<RouteList> r = routes.reader ();
62 for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
63 MidiTrack *track = dynamic_cast<MidiTrack*>((*i).get());
72 Session::setup_midi_control ()
74 outbound_mtc_timecode_frame = 0;
75 next_quarter_frame_to_send = 0;
77 /* Set up the qtr frame message */
92 if (Config->get_mmc_control ()) {
93 request_transport_speed (1.0);
98 Session::spp_continue ()
106 if (Config->get_mmc_control ()) {
112 Session::mmc_deferred_play (MIDI::MachineControl &/*mmc*/)
114 if (Config->get_mmc_control ()) {
115 request_transport_speed (1.0);
120 Session::mmc_record_pause (MIDI::MachineControl &/*mmc*/)
122 if (Config->get_mmc_control ()) {
123 maybe_enable_record();
128 Session::mmc_record_strobe (MIDI::MachineControl &/*mmc*/)
130 if (!Config->get_mmc_control() || (_step_editors > 0)) {
134 /* record strobe does an implicit "Play" command */
136 if (_transport_speed != 1.0) {
138 /* start_transport() will move from Enabled->Recording, so we
139 don't need to do anything here except enable recording.
140 its not the same as maybe_enable_record() though, because
141 that *can* switch to Recording, which we do not want.
144 save_state ("", true);
145 g_atomic_int_set (&_record_status, Enabled);
146 RecordStateChanged (); /* EMIT SIGNAL */
148 request_transport_speed (1.0);
157 Session::mmc_record_exit (MIDI::MachineControl &/*mmc*/)
159 if (Config->get_mmc_control ()) {
160 disable_record (false);
165 Session::mmc_stop (MIDI::MachineControl &/*mmc*/)
167 if (Config->get_mmc_control ()) {
173 Session::mmc_pause (MIDI::MachineControl &/*mmc*/)
175 if (Config->get_mmc_control ()) {
177 /* We support RECORD_PAUSE, so the spec says that
178 we must interpret PAUSE like RECORD_PAUSE if
182 if (actively_recording()) {
183 maybe_enable_record ();
190 static bool step_queued = false;
193 Session::mmc_step (MIDI::MachineControl &/*mmc*/, int steps)
195 if (!Config->get_mmc_control ()) {
200 struct timeval diff = { 0, 0 };
202 gettimeofday (&now, 0);
204 timersub (&now, &last_mmc_step, &diff);
206 gettimeofday (&now, 0);
207 timersub (&now, &last_mmc_step, &diff);
209 if (last_mmc_step.tv_sec != 0 && (diff.tv_usec + (diff.tv_sec * 1000000)) < _engine.usecs_per_cycle()) {
213 double diff_secs = diff.tv_sec + (diff.tv_usec / 1000000.0);
214 double cur_speed = (((steps * 0.5) * timecode_frames_per_second()) / diff_secs) / timecode_frames_per_second();
216 if (_transport_speed == 0 || cur_speed * _transport_speed < 0) {
217 /* change direction */
218 step_speed = cur_speed;
220 step_speed = (0.6 * step_speed) + (0.4 * cur_speed);
226 cerr << "delta = " << diff_secs
227 << " ct = " << _transport_speed
228 << " steps = " << steps
229 << " new speed = " << cur_speed
230 << " speed = " << step_speed
234 request_transport_speed_nonzero (step_speed);
238 if (midi_control_ui) {
239 RefPtr<TimeoutSource> tsrc = TimeoutSource::create (100);
240 tsrc->connect (sigc::mem_fun (*this, &Session::mmc_step_timeout));
241 tsrc->attach (midi_control_ui->main_loop()->get_context());
248 Session::mmc_rewind (MIDI::MachineControl &/*mmc*/)
250 if (Config->get_mmc_control ()) {
251 request_transport_speed(-8.0f);
256 Session::mmc_fast_forward (MIDI::MachineControl &/*mmc*/)
258 if (Config->get_mmc_control ()) {
259 request_transport_speed(8.0f);
264 Session::mmc_locate (MIDI::MachineControl &/*mmc*/, const MIDI::byte* mmc_tc)
266 if (!Config->get_mmc_control ()) {
270 framepos_t target_frame;
271 Timecode::Time timecode;
273 timecode.hours = mmc_tc[0] & 0xf;
274 timecode.minutes = mmc_tc[1];
275 timecode.seconds = mmc_tc[2];
276 timecode.frames = mmc_tc[3];
277 timecode.rate = timecode_frames_per_second();
278 timecode.drop = timecode_drop_frames();
280 // Also takes timecode offset into account:
281 timecode_to_sample( timecode, target_frame, true /* use_offset */, false /* use_subframes */ );
283 if (target_frame > max_framepos) {
284 target_frame = max_framepos;
287 /* Some (all?) MTC/MMC devices do not send a full MTC frame
288 at the end of a locate, instead sending only an MMC
289 locate command. This causes the current position
290 of an MTC slave to become out of date. Catch this.
293 MTC_Slave* mtcs = dynamic_cast<MTC_Slave*> (_slave);
296 // cerr << "Locate *with* MTC slave\n";
297 mtcs->handle_locate (mmc_tc);
299 // cerr << "Locate without MTC slave\n";
300 request_locate (target_frame, false);
305 Session::mmc_shuttle (MIDI::MachineControl &/*mmc*/, float speed, bool forw)
307 if (!Config->get_mmc_control ()) {
311 if (Config->get_shuttle_speed_threshold() >= 0 && speed > Config->get_shuttle_speed_threshold()) {
312 speed *= Config->get_shuttle_speed_factor();
316 request_transport_speed_nonzero (speed);
318 request_transport_speed_nonzero (-speed);
323 Session::mmc_record_enable (MIDI::MachineControl &mmc, size_t trk, bool enabled)
325 if (!Config->get_mmc_control ()) {
329 RouteList::iterator i;
330 boost::shared_ptr<RouteList> r = routes.reader();
332 for (i = r->begin(); i != r->end(); ++i) {
335 if ((at = dynamic_cast<AudioTrack*>((*i).get())) != 0) {
336 if (trk == at->remote_control_id()) {
337 at->set_record_enabled (enabled, &mmc);
344 /** Send MTC Full Frame message (complete Timecode time) for the start of this cycle.
345 * This resets the MTC code, the next quarter frame message that is sent will be
346 * the first one with the beginning of this cycle as the new start point.
347 * @param t time to send.
350 Session::send_full_time_code (framepos_t const t)
352 /* This function could easily send at a given frame offset, but would
353 * that be useful? Does ardour do sub-block accurate locating? [DR] */
356 Timecode::Time timecode;
358 _send_timecode_update = false;
360 if (_engine.freewheeling() || !Config->get_send_mtc()) {
363 if (_slave && !_slave->locked()) {
367 // Get timecode time for the given time
368 sample_to_timecode (t, timecode, true /* use_offset */, false /* no subframes */);
370 // sample-align outbound to rounded (no subframes) timecode
372 timecode_to_sample(timecode, mtc_tc, true, false);
373 outbound_mtc_timecode_frame = mtc_tc;
375 transmitting_timecode_time = timecode;
377 double const quarter_frame_duration = ((framecnt_t) _frames_per_timecode_frame) / 4.0;
378 if (ceil((t - mtc_tc) / quarter_frame_duration) > 0) {
379 Timecode::increment (transmitting_timecode_time, config.get_subframes_per_frame());
380 outbound_mtc_timecode_frame += _frames_per_timecode_frame;
383 DEBUG_TRACE (DEBUG::MTC, string_compose ("Full MTC TC %1\n", outbound_mtc_timecode_frame));
385 // I don't understand this bit yet.. [DR]
387 // according to MTC spec 24, 30 drop and 30 non-drop TC, the frame-number represented by 8 quarter frames must be even.
388 if (((mtc_timecode_bits >> 5) != MIDI::MTC_25_FPS) && (transmitting_timecode_time.frames % 2)) {
389 // start MTC quarter frame transmission on an even frame
390 Timecode::increment (transmitting_timecode_time, config.get_subframes_per_frame());
391 outbound_mtc_timecode_frame += _frames_per_timecode_frame;
394 #if 0 // compensate for audio latency -- disabled [rg]
395 /* this needs more thought and work.
396 * the proper solution will be to just offset MTC by the MIDI port's latency.
398 * using worst_playback_latency() is wrong when the generated MTC is used to sync
399 * clients which send audio to Ardour for recording.
400 * worst_capture_latency() vs. worst_playback_latency()
402 * NB. similarly to session_ltc, the offset should be subtracted from the timecode to send,
403 * instead of being added to timestamp when to send the timecode.
404 * Otherwise the timestamp may not fall into the jack-cycle of the current _transport frame.
405 * and no MTC QF will be sent.
407 outbound_mtc_timecode_frame += worst_playback_latency();
409 next_quarter_frame_to_send = 0;
411 // Sync slave to the same Timecode time as we are on
419 msg[5] = mtc_timecode_bits | timecode.hours;
420 msg[6] = timecode.minutes;
421 msg[7] = timecode.seconds;
422 msg[8] = timecode.frames;
424 // Send message at offset 0, sent time is for the start of this cycle
425 if (MIDI::Manager::instance()->mtc_output_port()->midimsg (msg, sizeof (msg), 0)) {
426 error << _("Session: could not send full MIDI time code") << endmsg;
430 _pframes_since_last_mtc = 0;
434 /** Send MTC (quarter-frame) messages for this cycle.
435 * Must be called exactly once per cycle from the process thread. Realtime safe.
436 * This function assumes the state of full Timecode is sane, eg. the slave is
437 * expecting quarter frame messages and has the right frame of reference (any
438 * full MTC Timecode time messages that needed to be sent should have been sent
439 * earlier already this cycle by send_full_time_code)
442 Session::send_midi_time_code_for_cycle (framepos_t start_frame, framepos_t end_frame, pframes_t nframes)
444 if (_engine.freewheeling() || !_send_qf_mtc || transmitting_timecode_time.negative || (next_quarter_frame_to_send < 0)) {
445 // cerr << "(MTC) Not sending MTC\n";
448 if (_slave && !_slave->locked()) {
452 /* MTC is max. 30 fps - assert() below will fail
453 * TODO actually limit it to 24,25,29df,30fps
454 * talk to oofus, first.
456 if (Timecode::timecode_to_frames_per_second(config.get_timecode_format()) > 30) {
460 assert (next_quarter_frame_to_send >= 0);
461 assert (next_quarter_frame_to_send <= 7);
463 /* Duration of one quarter frame */
464 double const quarter_frame_duration = _frames_per_timecode_frame / 4.0;
466 DEBUG_TRACE (DEBUG::MTC, string_compose ("TF %1 SF %2 MT %3 QF %4 QD %5\n",
467 _transport_frame, start_frame, outbound_mtc_timecode_frame,
468 next_quarter_frame_to_send, quarter_frame_duration));
470 if (rint(outbound_mtc_timecode_frame + (next_quarter_frame_to_send * quarter_frame_duration)) < _transport_frame) {
471 send_full_time_code (_transport_frame);
475 /* Send quarter frames for this cycle */
476 while (end_frame > rint(outbound_mtc_timecode_frame + (next_quarter_frame_to_send * quarter_frame_duration))) {
478 DEBUG_TRACE (DEBUG::MTC, string_compose ("next frame to send: %1\n", next_quarter_frame_to_send));
480 switch (next_quarter_frame_to_send) {
482 mtc_msg[1] = 0x00 | (transmitting_timecode_time.frames & 0xf);
485 mtc_msg[1] = 0x10 | ((transmitting_timecode_time.frames & 0xf0) >> 4);
488 mtc_msg[1] = 0x20 | (transmitting_timecode_time.seconds & 0xf);
491 mtc_msg[1] = 0x30 | ((transmitting_timecode_time.seconds & 0xf0) >> 4);
494 mtc_msg[1] = 0x40 | (transmitting_timecode_time.minutes & 0xf);
497 mtc_msg[1] = 0x50 | ((transmitting_timecode_time.minutes & 0xf0) >> 4);
500 mtc_msg[1] = 0x60 | ((mtc_timecode_bits | transmitting_timecode_time.hours) & 0xf);
503 mtc_msg[1] = 0x70 | (((mtc_timecode_bits | transmitting_timecode_time.hours) & 0xf0) >> 4);
507 const framepos_t msg_time = rint(outbound_mtc_timecode_frame + (quarter_frame_duration * next_quarter_frame_to_send));
509 // This message must fall within this block or something is broken
510 assert (msg_time >= start_frame);
511 assert (msg_time < end_frame);
513 /* convert from session frames back to JACK frames using the transport speed */
514 pframes_t const out_stamp = (msg_time - start_frame) / _transport_speed;
515 assert (out_stamp < nframes);
517 if (MIDI::Manager::instance()->mtc_output_port()->midimsg (mtc_msg, 2, out_stamp)) {
518 error << string_compose(_("Session: cannot send quarter-frame MTC message (%1)"), strerror (errno))
525 DEBUG_STR_APPEND(foo,"sending ");
526 DEBUG_STR_APPEND(foo, transmitting_timecode_time);
527 DEBUG_TRACE (DEBUG::MTC, string_compose ("%1 qfm = %2, stamp = %3\n", DEBUG_STR(foo).str(), next_quarter_frame_to_send,
531 // Increment quarter frame counter
532 next_quarter_frame_to_send++;
534 if (next_quarter_frame_to_send >= 8) {
535 // Wrap quarter frame counter
536 next_quarter_frame_to_send = 0;
537 // Increment timecode time twice
538 Timecode::increment (transmitting_timecode_time, config.get_subframes_per_frame());
539 Timecode::increment (transmitting_timecode_time, config.get_subframes_per_frame());
540 // Re-calculate timing of first quarter frame
541 //timecode_to_sample( transmitting_timecode_time, outbound_mtc_timecode_frame, true /* use_offset */, false );
542 outbound_mtc_timecode_frame += 2.0 * _frames_per_timecode_frame;
549 /***********************************************************************
551 **********************************************************************/
555 Session::mmc_step_timeout ()
560 gettimeofday (&now, 0);
562 timersub (&now, &last_mmc_step, &diff);
563 diff_usecs = diff.tv_sec * 1000000 + diff.tv_usec;
565 if (diff_usecs > 1000000.0 || fabs (_transport_speed) < 0.0000001) {
566 /* too long or too slow, stop transport */
567 request_transport_speed (0.0);
572 if (diff_usecs < 250000.0) {
573 /* too short, just keep going */
579 request_transport_speed_nonzero (_transport_speed * 0.75);
584 Session::start_midi_thread ()
586 midi_control_ui = new MidiControlUI (*this);
587 midi_control_ui->run ();