3 Copyright (C) 1999-2002 Paul Davis
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 #include <boost/shared_ptr.hpp>
31 #include <midi++/mmc.h>
32 #include <midi++/port.h>
33 #include <midi++/manager.h>
34 #include <pbd/error.h>
35 #include <glibmm/thread.h>
36 #include <pbd/pthread_utils.h>
38 #include <ardour/configuration.h>
39 #include <ardour/audioengine.h>
40 #include <ardour/session.h>
41 #include <ardour/audio_track.h>
42 #include <ardour/midi_track.h>
43 #include <ardour/audio_diskstream.h>
44 #include <ardour/slave.h>
45 #include <ardour/cycles.h>
46 #include <ardour/smpte.h>
51 using namespace ARDOUR;
55 MachineControl::CommandSignature MMC_CommandSignature;
56 MachineControl::ResponseSignature MMC_ResponseSignature;
63 boost::shared_ptr<RouteList> r = routes.reader ();
65 for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
66 MidiTrack *track = dynamic_cast<MidiTrack*>((*i).get());
75 Session::use_config_midi_ports ()
79 if (default_mmc_port) {
80 set_mmc_port (default_mmc_port->name());
85 if (default_mtc_port) {
86 set_mtc_port (default_mtc_port->name());
91 if (default_midi_port) {
92 set_midi_port (default_midi_port->name());
101 /***********************************************************************
103 **********************************************************************/
106 Session::set_mtc_port (string port_tag)
110 if (port_tag.length() == 0) {
112 if (_slave && ((ms = dynamic_cast<MTC_Slave*> (_slave)) != 0)) {
113 error << _("Ardour is slaved to MTC - port cannot be reset") << endmsg;
117 if (_mtc_port == 0) {
127 if ((port = MIDI::Manager::instance()->port (port_tag)) == 0) {
128 error << string_compose (_("unknown port %1 requested for MTC"), port_tag) << endl;
134 if (_slave && ((ms = dynamic_cast<MTC_Slave*> (_slave)) != 0)) {
138 Config->set_mtc_port_name (port_tag);
141 MTC_PortChanged(); /* EMIT SIGNAL */
142 change_midi_ports ();
148 Session::set_mmc_receive_device_id (uint32_t device_id)
151 mmc->set_receive_device_id (device_id);
156 Session::set_mmc_send_device_id (uint32_t device_id)
159 mmc->set_send_device_id (device_id);
164 Session::set_mmc_port (string port_tag)
166 MIDI::byte old_recv_device_id = 0;
167 MIDI::byte old_send_device_id = 0;
168 bool reset_id = false;
170 if (port_tag.length() == 0) {
171 if (_mmc_port == 0) {
180 if ((port = MIDI::Manager::instance()->port (port_tag)) == 0) {
187 old_recv_device_id = mmc->receive_device_id();
188 old_recv_device_id = mmc->send_device_id();
193 mmc = new MIDI::MachineControl (*_mmc_port, 1.0,
194 MMC_CommandSignature,
195 MMC_ResponseSignature);
198 mmc->set_receive_device_id (old_recv_device_id);
199 mmc->set_send_device_id (old_send_device_id);
203 (mem_fun (*this, &Session::mmc_deferred_play));
204 mmc->DeferredPlay.connect
205 (mem_fun (*this, &Session::mmc_deferred_play));
207 (mem_fun (*this, &Session::mmc_stop));
208 mmc->FastForward.connect
209 (mem_fun (*this, &Session::mmc_fast_forward));
211 (mem_fun (*this, &Session::mmc_rewind));
213 (mem_fun (*this, &Session::mmc_pause));
214 mmc->RecordPause.connect
215 (mem_fun (*this, &Session::mmc_record_pause));
216 mmc->RecordStrobe.connect
217 (mem_fun (*this, &Session::mmc_record_strobe));
218 mmc->RecordExit.connect
219 (mem_fun (*this, &Session::mmc_record_exit));
221 (mem_fun (*this, &Session::mmc_locate));
223 (mem_fun (*this, &Session::mmc_step));
225 (mem_fun (*this, &Session::mmc_shuttle));
226 mmc->TrackRecordStatusChange.connect
227 (mem_fun (*this, &Session::mmc_record_enable));
230 /* also handle MIDI SPP because its so common */
232 _mmc_port->input()->start.connect (mem_fun (*this, &Session::spp_start));
233 _mmc_port->input()->contineu.connect (mem_fun (*this, &Session::spp_continue));
234 _mmc_port->input()->stop.connect (mem_fun (*this, &Session::spp_stop));
236 Config->set_mmc_port_name (port_tag);
239 MMC_PortChanged(); /* EMIT SIGNAL */
240 change_midi_ports ();
246 Session::set_midi_port (string port_tag)
249 if (port_tag.length() == 0) {
250 if (_midi_port == 0) {
259 if ((port = MIDI::Manager::instance()->port (port_tag)) == 0) {
265 /* XXX need something to forward this to control protocols ? or just
269 Config->set_midi_port_name (port_tag);
273 MIDI_PortChanged(); /* EMIT SIGNAL */
274 change_midi_ports ();
280 Session::set_trace_midi_input (bool yn, MIDI::Port* port)
282 MIDI::Parser* input_parser;
285 if ((input_parser = port->input()) != 0) {
286 input_parser->trace (yn, &cout, "input: ");
291 if ((input_parser = _mmc_port->input()) != 0) {
292 input_parser->trace (yn, &cout, "input: ");
296 if (_mtc_port && _mtc_port != _mmc_port) {
297 if ((input_parser = _mtc_port->input()) != 0) {
298 input_parser->trace (yn, &cout, "input: ");
302 if (_midi_port && _midi_port != _mmc_port && _midi_port != _mtc_port ) {
303 if ((input_parser = _midi_port->input()) != 0) {
304 input_parser->trace (yn, &cout, "input: ");
309 Config->set_trace_midi_input (yn);
313 Session::set_trace_midi_output (bool yn, MIDI::Port* port)
315 MIDI::Parser* output_parser;
318 if ((output_parser = port->output()) != 0) {
319 output_parser->trace (yn, &cout, "output: ");
323 if ((output_parser = _mmc_port->output()) != 0) {
324 output_parser->trace (yn, &cout, "output: ");
328 if (_mtc_port && _mtc_port != _mmc_port) {
329 if ((output_parser = _mtc_port->output()) != 0) {
330 output_parser->trace (yn, &cout, "output: ");
334 if (_midi_port && _midi_port != _mmc_port && _midi_port != _mtc_port ) {
335 if ((output_parser = _midi_port->output()) != 0) {
336 output_parser->trace (yn, &cout, "output: ");
342 Config->set_trace_midi_output (yn);
346 Session::get_trace_midi_input(MIDI::Port *port)
348 MIDI::Parser* input_parser;
350 if ((input_parser = port->input()) != 0) {
351 return input_parser->tracing();
356 if ((input_parser = _mmc_port->input()) != 0) {
357 return input_parser->tracing();
362 if ((input_parser = _mtc_port->input()) != 0) {
363 return input_parser->tracing();
368 if ((input_parser = _midi_port->input()) != 0) {
369 return input_parser->tracing();
378 Session::get_trace_midi_output(MIDI::Port *port)
380 MIDI::Parser* output_parser;
382 if ((output_parser = port->output()) != 0) {
383 return output_parser->tracing();
388 if ((output_parser = _mmc_port->output()) != 0) {
389 return output_parser->tracing();
394 if ((output_parser = _mtc_port->output()) != 0) {
395 return output_parser->tracing();
400 if ((output_parser = _midi_port->output()) != 0) {
401 return output_parser->tracing();
411 Session::setup_midi_control ()
413 outbound_mtc_smpte_frame = 0;
414 next_quarter_frame_to_send = 0;
416 /* setup the MMC buffer */
418 mmc_buffer[0] = 0xf0; // SysEx
419 mmc_buffer[1] = 0x7f; // Real Time SysEx ID for MMC
420 mmc_buffer[2] = (mmc ? mmc->send_device_id() : 0x7f);
421 mmc_buffer[3] = 0x6; // MCC
423 /* Set up the qtr frame message */
436 Session::spp_start (Parser& ignored)
438 if (Config->get_mmc_control() && (Config->get_slave_source() != MTC)) {
439 request_transport_speed (1.0);
444 Session::spp_continue (Parser& ignored)
450 Session::spp_stop (Parser& ignored)
452 if (Config->get_mmc_control()) {
458 Session::mmc_deferred_play (MIDI::MachineControl &mmc)
460 if (Config->get_mmc_control() && (Config->get_slave_source() != MTC)) {
461 request_transport_speed (1.0);
466 Session::mmc_record_pause (MIDI::MachineControl &mmc)
468 if (Config->get_mmc_control()) {
469 maybe_enable_record();
474 Session::mmc_record_strobe (MIDI::MachineControl &mmc)
476 if (!Config->get_mmc_control())
479 /* record strobe does an implicit "Play" command */
481 if (_transport_speed != 1.0) {
483 /* start_transport() will move from Enabled->Recording, so we
484 don't need to do anything here except enable recording.
485 its not the same as maybe_enable_record() though, because
486 that *can* switch to Recording, which we do not want.
489 save_state ("", true);
490 g_atomic_int_set (&_record_status, Enabled);
491 RecordStateChanged (); /* EMIT SIGNAL */
493 request_transport_speed (1.0);
502 Session::mmc_record_exit (MIDI::MachineControl &mmc)
504 if (Config->get_mmc_control()) {
505 disable_record (false);
510 Session::mmc_stop (MIDI::MachineControl &mmc)
512 if (Config->get_mmc_control()) {
518 Session::mmc_pause (MIDI::MachineControl &mmc)
520 if (Config->get_mmc_control()) {
522 /* We support RECORD_PAUSE, so the spec says that
523 we must interpret PAUSE like RECORD_PAUSE if
527 if (actively_recording()) {
528 maybe_enable_record ();
535 static bool step_queued = false;
538 Session::mmc_step (MIDI::MachineControl &mmc, int steps)
540 if (!Config->get_mmc_control()) {
545 struct timeval diff = { 0, 0 };
547 gettimeofday (&now, 0);
549 timersub (&now, &last_mmc_step, &diff);
551 gettimeofday (&now, 0);
552 timersub (&now, &last_mmc_step, &diff);
554 if (last_mmc_step.tv_sec != 0 && (diff.tv_usec + (diff.tv_sec * 1000000)) < _engine.usecs_per_cycle()) {
558 double diff_secs = diff.tv_sec + (diff.tv_usec / 1000000.0);
559 double cur_speed = (((steps * 0.5) * smpte_frames_per_second()) / diff_secs) / smpte_frames_per_second();
561 if (_transport_speed == 0 || cur_speed * _transport_speed < 0) {
562 /* change direction */
563 step_speed = cur_speed;
565 step_speed = (0.6 * step_speed) + (0.4 * cur_speed);
571 cerr << "delta = " << diff_secs
572 << " ct = " << _transport_speed
573 << " steps = " << steps
574 << " new speed = " << cur_speed
575 << " speed = " << step_speed
579 request_transport_speed (step_speed);
583 midi_timeouts.push_back (mem_fun (*this, &Session::mmc_step_timeout));
589 Session::mmc_rewind (MIDI::MachineControl &mmc)
591 if (Config->get_mmc_control()) {
592 request_transport_speed(-8.0f);
597 Session::mmc_fast_forward (MIDI::MachineControl &mmc)
599 if (Config->get_mmc_control()) {
600 request_transport_speed(8.0f);
605 Session::mmc_locate (MIDI::MachineControl &mmc, const MIDI::byte* mmc_tc)
607 if (!Config->get_mmc_control()) {
611 nframes_t target_frame;
614 smpte.hours = mmc_tc[0] & 0xf;
615 smpte.minutes = mmc_tc[1];
616 smpte.seconds = mmc_tc[2];
617 smpte.frames = mmc_tc[3];
618 smpte.rate = smpte_frames_per_second();
619 smpte.drop = smpte_drop_frames();
621 // Also takes smpte offset into account:
622 smpte_to_sample( smpte, target_frame, true /* use_offset */, false /* use_subframes */ );
624 if (target_frame > max_frames) {
625 target_frame = max_frames;
628 /* Some (all?) MTC/MMC devices do not send a full MTC frame
629 at the end of a locate, instead sending only an MMC
630 locate command. This causes the current position
631 of an MTC slave to become out of date. Catch this.
634 MTC_Slave* mtcs = dynamic_cast<MTC_Slave*> (_slave);
637 // cerr << "Locate *with* MTC slave\n";
638 mtcs->handle_locate (mmc_tc);
640 // cerr << "Locate without MTC slave\n";
641 request_locate (target_frame, false);
646 Session::mmc_shuttle (MIDI::MachineControl &mmc, float speed, bool forw)
648 if (!Config->get_mmc_control()) {
652 if (Config->get_shuttle_speed_threshold() >= 0 && speed > Config->get_shuttle_speed_threshold()) {
653 speed *= Config->get_shuttle_speed_factor();
657 request_transport_speed (speed);
659 request_transport_speed (-speed);
664 Session::mmc_record_enable (MIDI::MachineControl &mmc, size_t trk, bool enabled)
666 if (Config->get_mmc_control()) {
668 RouteList::iterator i;
669 boost::shared_ptr<RouteList> r = routes.reader();
671 for (i = r->begin(); i != r->end(); ++i) {
674 if ((at = dynamic_cast<AudioTrack*>((*i).get())) != 0) {
675 if (trk == at->remote_control_id()) {
676 at->set_record_enable (enabled, &mmc);
685 Session::change_midi_ports ()
687 MIDIRequest* request = new MIDIRequest;
689 request->type = MIDIRequest::PortChange;
690 midi_requests.write (&request, 1);
694 /** Send MTC Full Frame message (complete SMPTE time) for the start of this cycle.
695 * This resets the MTC code, the next quarter frame message that is sent will be
696 * the first one with the beginning of this cycle as the new start point.
700 Session::send_full_time_code(nframes_t nframes)
702 /* This function could easily send at a given frame offset, but would
703 * that be useful? Does ardour do sub-block accurate locating? [DR] */
708 _send_smpte_update = false;
710 if (_mtc_port == 0 || !session_send_mtc) {
714 // Get smpte time for this transport frame
715 sample_to_smpte(_transport_frame, smpte, true /* use_offset */, false /* no subframes */);
717 transmitting_smpte_time = smpte;
718 outbound_mtc_smpte_frame = _transport_frame;
720 // I don't understand this bit yet.. [DR]
721 if (((mtc_smpte_bits >> 5) != MIDI::MTC_25_FPS) && (transmitting_smpte_time.frames % 2)) {
722 // start MTC quarter frame transmission on an even frame
723 SMPTE::increment( transmitting_smpte_time );
724 outbound_mtc_smpte_frame += (nframes_t) _frames_per_smpte_frame;
727 // Compensate for audio latency
728 outbound_mtc_smpte_frame += _worst_output_latency;
730 next_quarter_frame_to_send = 0;
732 // Sync slave to the same SMPTE time as we are on
740 msg[5] = mtc_smpte_bits | smpte.hours;
741 msg[6] = smpte.minutes;
742 msg[7] = smpte.seconds;
743 msg[8] = smpte.frames;
745 cerr << "MTC: Sending full time code at " << outbound_mtc_smpte_frame << endl;
747 // Send message at offset 0, sent time is for the start of this cycle
748 if (_mtc_port->midimsg (msg, sizeof (msg), 0)) {
749 error << _("Session: could not send full MIDI time code") << endmsg;
757 /** Sends MTC (quarter-frame) messages for this cycle.
758 * Must be called exactly once per cycle from the audio thread. Realtime safe.
759 * This function assumes the state of full SMPTE is sane, eg. the slave is
760 * expecting quarter frame messages and has the right frame of reference (any
761 * full MTC SMPTE time messages that needed to be sent should have been sent
762 * earlier already this cycle by send_full_time_code)
765 Session::send_midi_time_code_for_cycle(nframes_t nframes)
767 assert (next_quarter_frame_to_send >= 0);
768 assert (next_quarter_frame_to_send <= 7);
770 if (_mtc_port == 0 || !session_send_mtc || transmitting_smpte_time.negative
771 /*|| (next_quarter_frame_to_send < 0)*/ ) {
772 // cerr << "(MTC) Not sending MTC\n";
776 /* Duration of one quarter frame */
777 nframes_t quarter_frame_duration = ((long) _frames_per_smpte_frame) >> 2;
779 // cerr << "(MTC) TR: " << _transport_frame << " - SF: " << outbound_mtc_smpte_frame
780 // << " - NQ: " << next_quarter_frame_to_send << " - FD" << quarter_frame_duration << endl;
782 // FIXME: this should always be true
783 //assert((outbound_mtc_smpte_frame + (next_quarter_frame_to_send * quarter_frame_duration))
784 // > _transport_frame);
787 // Send quarter frames for this cycle
788 while (_transport_frame + nframes > (outbound_mtc_smpte_frame +
789 (next_quarter_frame_to_send * quarter_frame_duration))) {
791 // cerr << "(MTC) Next frame to send: " << next_quarter_frame_to_send << endl;
793 switch (next_quarter_frame_to_send) {
795 mtc_msg[1] = 0x00 | (transmitting_smpte_time.frames & 0xf);
798 mtc_msg[1] = 0x10 | ((transmitting_smpte_time.frames & 0xf0) >> 4);
801 mtc_msg[1] = 0x20 | (transmitting_smpte_time.seconds & 0xf);
804 mtc_msg[1] = 0x30 | ((transmitting_smpte_time.seconds & 0xf0) >> 4);
807 mtc_msg[1] = 0x40 | (transmitting_smpte_time.minutes & 0xf);
810 mtc_msg[1] = 0x50 | ((transmitting_smpte_time.minutes & 0xf0) >> 4);
813 mtc_msg[1] = 0x60 | ((mtc_smpte_bits|transmitting_smpte_time.hours) & 0xf);
816 mtc_msg[1] = 0x70 | (((mtc_smpte_bits|transmitting_smpte_time.hours) & 0xf0) >> 4);
820 const nframes_t msg_time = (outbound_mtc_smpte_frame
821 + (quarter_frame_duration * next_quarter_frame_to_send));
823 // This message must fall within this block or something is broken
824 assert(msg_time >= _transport_frame);
825 assert(msg_time < _transport_frame + nframes);
827 nframes_t out_stamp = msg_time - _transport_frame;
828 assert(out_stamp < nframes);
830 if (_mtc_port->midimsg (mtc_msg, 2, out_stamp)) {
831 error << string_compose(_("Session: cannot send quarter-frame MTC message (%1)"), strerror (errno))
836 /*cerr << "(MTC) SMPTE: " << transmitting_smpte_time.hours
837 << ":" << transmitting_smpte_time.minutes
838 << ":" << transmitting_smpte_time.seconds
839 << ":" << transmitting_smpte_time.frames
840 << ", qfm = " << next_quarter_frame_to_send
841 << ", stamp = " << out_stamp
842 << ", delta = " << _transport_frame + out_stamp - last_time << endl;*/
844 // Increment quarter frame counter
845 next_quarter_frame_to_send++;
847 if (next_quarter_frame_to_send >= 8) {
848 // Wrap quarter frame counter
849 next_quarter_frame_to_send = 0;
850 // Increment smpte time twice
851 SMPTE::increment( transmitting_smpte_time );
852 SMPTE::increment( transmitting_smpte_time );
853 // Re-calculate timing of first quarter frame
854 //smpte_to_sample( transmitting_smpte_time, outbound_mtc_smpte_frame, true /* use_offset */, false );
855 outbound_mtc_smpte_frame += 8 * quarter_frame_duration;
856 // Compensate for audio latency
857 outbound_mtc_smpte_frame += _worst_output_latency;
864 /***********************************************************************
866 **********************************************************************/
869 Session::deliver_mmc (MIDI::MachineControl::Command cmd, nframes_t where)
871 using namespace MIDI;
875 if (_mmc_port == 0 || !session_send_mmc) {
876 // cerr << "Not delivering MMC " << _mmc_port << " - " << session_send_mmc << endl;
880 mmc_buffer[nbytes++] = cmd;
882 // cerr << "delivering MMC, cmd = " << hex << (int) cmd << dec << endl;
885 case MachineControl::cmdLocate:
886 smpte_time_subframes (where, smpte);
888 mmc_buffer[nbytes++] = 0x6; // byte count
889 mmc_buffer[nbytes++] = 0x1; // "TARGET" subcommand
890 mmc_buffer[nbytes++] = smpte.hours;
891 mmc_buffer[nbytes++] = smpte.minutes;
892 mmc_buffer[nbytes++] = smpte.seconds;
893 mmc_buffer[nbytes++] = smpte.frames;
894 mmc_buffer[nbytes++] = smpte.subframes;
897 case MachineControl::cmdStop:
900 case MachineControl::cmdPlay:
901 /* always convert Play into Deferred Play */
903 mmc_buffer[4] = MachineControl::cmdDeferredPlay;
906 case MachineControl::cmdDeferredPlay:
909 case MachineControl::cmdRecordStrobe:
912 case MachineControl::cmdRecordExit:
915 case MachineControl::cmdRecordPause:
924 mmc_buffer[nbytes++] = 0xf7; // terminate SysEx/MMC message
926 if (_mmc_port->midimsg (mmc_buffer, nbytes, 0)) {
927 error << string_compose(_("MMC: cannot send command %1%2%3"), &hex, cmd, &dec) << endmsg;
933 Session::mmc_step_timeout ()
938 gettimeofday (&now, 0);
940 timersub (&now, &last_mmc_step, &diff);
941 diff_usecs = diff.tv_sec * 1000000 + diff.tv_usec;
943 if (diff_usecs > 1000000.0 || fabs (_transport_speed) < 0.0000001) {
944 /* too long or too slow, stop transport */
945 request_transport_speed (0.0);
950 if (diff_usecs < 250000.0) {
951 /* too short, just keep going */
957 request_transport_speed (_transport_speed * 0.75);
961 /*---------------------------------------------------------------------------
963 ---------------------------------------------------------------------------*/
966 Session::start_midi_thread ()
968 if (pipe (midi_request_pipe)) {
969 error << string_compose(_("Cannot create transport request signal pipe (%1)"), strerror (errno)) << endmsg;
973 if (fcntl (midi_request_pipe[0], F_SETFL, O_NONBLOCK)) {
974 error << string_compose(_("UI: cannot set O_NONBLOCK on " "signal read pipe (%1)"), strerror (errno)) << endmsg;
978 if (fcntl (midi_request_pipe[1], F_SETFL, O_NONBLOCK)) {
979 error << string_compose(_("UI: cannot set O_NONBLOCK on " "signal write pipe (%1)"), strerror (errno)) << endmsg;
983 if (pthread_create_and_store ("transport", &midi_thread, 0, _midi_thread_work, this)) {
984 error << _("Session: could not create transport thread") << endmsg;
992 Session::terminate_midi_thread ()
996 MIDIRequest* request = new MIDIRequest;
999 request->type = MIDIRequest::Quit;
1001 midi_requests.write (&request, 1);
1002 poke_midi_thread ();
1004 pthread_join (midi_thread, &status);
1009 Session::poke_midi_thread ()
1013 if (write (midi_request_pipe[1], &c, 1) != 1) {
1014 error << string_compose(_("cannot send signal to midi thread! (%1)"), strerror (errno)) << endmsg;
1019 Session::_midi_thread_work (void* arg)
1021 pthread_setcancelstate (PTHREAD_CANCEL_ENABLE, 0);
1022 pthread_setcanceltype (PTHREAD_CANCEL_ASYNCHRONOUS, 0);
1024 ((Session *) arg)->midi_thread_work ();
1029 Session::midi_thread_work ()
1031 MIDIRequest* request;
1032 struct pollfd pfd[4];
1036 struct sched_param rtparam;
1039 vector<MIDI::Port*> ports;
1041 PBD::ThreadCreatedWithRequestSize (pthread_self(), X_("MIDI"), 2048);
1043 memset (&rtparam, 0, sizeof (rtparam));
1044 rtparam.sched_priority = 9; /* XXX should be relative to audio (JACK) thread */
1046 if ((x = pthread_setschedparam (pthread_self(), SCHED_FIFO, &rtparam)) != 0) {
1047 // do we care? not particularly.
1050 /* set up the port vector; 4 is the largest possible size for now */
1052 ports.assign (4, (MIDI::Port*) 0);
1058 pfd[nfds].fd = midi_request_pipe[0];
1059 pfd[nfds].events = POLLIN|POLLHUP|POLLERR;
1062 if (Config->get_mmc_control() && _mmc_port && _mmc_port->selectable() >= 0) {
1063 pfd[nfds].fd = _mmc_port->selectable();
1064 pfd[nfds].events = POLLIN|POLLHUP|POLLERR;
1065 ports[nfds] = _mmc_port;
1069 /* if MTC is being handled on a different port from MMC
1070 or we are not handling MMC at all, poll
1074 if (_mtc_port && (_mtc_port != _mmc_port || !Config->get_mmc_control()) && _mtc_port->selectable() >= 0) {
1075 pfd[nfds].fd = _mtc_port->selectable();
1076 pfd[nfds].events = POLLIN|POLLHUP|POLLERR;
1077 ports[nfds] = _mtc_port;
1081 /* if we are using MMC control, we obviously have to listen
1085 if (_midi_port && (_midi_port != _mmc_port || !Config->get_mmc_control()) && (_midi_port != _mtc_port) && _midi_port->selectable() >= 0) {
1086 pfd[nfds].fd = _midi_port->selectable();
1087 pfd[nfds].events = POLLIN|POLLHUP|POLLERR;
1088 ports[nfds] = _midi_port;
1092 if (!midi_timeouts.empty()) {
1093 timeout = 100; /* 10msecs */
1095 timeout = -1; /* if there is no data, we don't care */
1099 // cerr << "MIDI poll on " << nfds << " for " << timeout << endl;
1100 if (poll (pfd, nfds, timeout) < 0) {
1101 if (errno == EINTR) {
1102 /* gdb at work, perhaps */
1106 error << string_compose(_("MIDI thread poll failed (%1)"), strerror (errno)) << endmsg;
1110 // cerr << "MIDI thread wakes at " << get_cycles () << endl;
1114 /* check the transport request pipe */
1116 if (pfd[0].revents & ~POLLIN) {
1117 error << _("Error on transport thread request pipe") << endmsg;
1121 if (pfd[0].revents & POLLIN) {
1125 // cerr << "MIDI request FIFO ready\n";
1128 /* empty the pipe of all current requests */
1131 size_t nread = read (midi_request_pipe[0], &foo, sizeof (foo));
1134 if ((size_t) nread < sizeof (foo)) {
1139 } else if (nread == 0) {
1141 } else if (errno == EAGAIN) {
1144 fatal << _("Error reading from transport request pipe") << endmsg;
1149 while (midi_requests.read (&request, 1) == 1) {
1151 switch (request->type) {
1152 case MIDIRequest::PortChange:
1153 /* restart poll with new ports */
1154 // cerr << "rebind\n";
1158 case MIDIRequest::Quit:
1160 pthread_exit_pbd (0);
1178 /* now read the rest of the ports */
1180 for (int p = 1; p < nfds; ++p) {
1181 if ((pfd[p].revents & ~POLLIN)) {
1182 // error << string_compose(_("Transport: error polling MIDI port %1 (revents =%2%3%4"), p, &hex, pfd[p].revents, &dec) << endmsg;
1186 if (pfd[p].revents & POLLIN) {
1192 /* timeout driven */
1194 if (fds_ready < 2 && timeout != -1) {
1196 for (MidiTimeoutList::iterator i = midi_timeouts.begin(); i != midi_timeouts.end(); ) {
1198 MidiTimeoutList::iterator tmp;
1203 midi_timeouts.erase (i);