libs/ardour/session_midi.cc

   1
   2 /*
   3   Copyright (C) 1999-2002 Paul Davis
   4
   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.
   9
  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.
  14
  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.
  18
  19 */
  20
  21 #include <string>
  22 #include <cmath>
  23 #include <cerrno>
  24 #include <cassert>
  25 #include <unistd.h>
  26 #include <fcntl.h>
  27 #include <poll.h>
  28
  29 #include <boost/shared_ptr.hpp>
  30
  31 #include <glibmm/main.h>
  32
  33 #include "midi++/mmc.h"
  34 #include "midi++/port.h"
  35 #include "midi++/manager.h"
  36 #include "pbd/error.h"
  37 #include "pbd/pthread_utils.h"
  38
  39 #include "ardour/configuration.h"
  40 #include "ardour/debug.h"
  41 #include "ardour/audioengine.h"
  42 #include "ardour/session.h"
  43 #include "ardour/audio_track.h"
  44 #include "ardour/midi_track.h"
  45 #include "ardour/midi_ui.h"
  46 #include "ardour/audio_diskstream.h"
  47 #include "ardour/slave.h"
  48 #include "ardour/cycles.h"
  49 #include "ardour/timecode.h"
  50
  51 #include "i18n.h"
  52
  53 using namespace std;
  54 using namespace ARDOUR;
  55 using namespace PBD;
  56 using namespace MIDI;
  57 using namespace Glib;
  58
  59 void
  60 Session::midi_panic()
  61 {
  62         {
  63                 boost::shared_ptr<RouteList> r = routes.reader ();
  64
  65                 for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
  66                         MidiTrack *track = dynamic_cast<MidiTrack*>((*i).get());
  67                         if (track != 0) {
  68                                 track->midi_panic();
  69                         }
  70                 }
  71         }
  72 }
  73
  74 void
  75 Session::setup_midi_control ()
  76 {
  77         outbound_mtc_timecode_frame = 0;
  78         next_quarter_frame_to_send = 0;
  79
  80         /* Set up the qtr frame message */
  81
  82         mtc_msg[0] = 0xf1;
  83         mtc_msg[2] = 0xf1;
  84         mtc_msg[4] = 0xf1;
  85         mtc_msg[6] = 0xf1;
  86         mtc_msg[8] = 0xf1;
  87         mtc_msg[10] = 0xf1;
  88         mtc_msg[12] = 0xf1;
  89         mtc_msg[14] = 0xf1;
  90 }
  91
  92 void
  93 Session::spp_start (Parser &, nframes_t /*timestamp*/)
  94 {
  95         if (Config->get_mmc_control() && (!config.get_external_sync() || config.get_sync_source() != JACK)) {
  96                 request_transport_speed (1.0);
  97         }
  98 }
  99
 100 void
 101 Session::spp_continue (Parser& ignored, nframes_t timestamp)
 102 {
 103         spp_start (ignored, timestamp);
 104 }
 105
 106 void
 107 Session::spp_stop (Parser&, nframes_t /*timestamp*/)
 108 {
 109         if (Config->get_mmc_control()) {
 110                 request_stop ();
 111         }
 112 }
 113
 114 void
 115 Session::mmc_deferred_play (MIDI::MachineControl &/*mmc*/)
 116 {
 117         if (Config->get_mmc_control() && (!config.get_external_sync() || (config.get_sync_source() != JACK))) {
 118                 request_transport_speed (1.0);
 119         }
 120 }
 121
 122 void
 123 Session::mmc_record_pause (MIDI::MachineControl &/*mmc*/)
 124 {
 125         if (Config->get_mmc_control()) {
 126                 maybe_enable_record();
 127         }
 128 }
 129
 130 void
 131 Session::mmc_record_strobe (MIDI::MachineControl &/*mmc*/)
 132 {
 133         if (!Config->get_mmc_control()) {
 134                 return;
 135         }
 136
 137         /* record strobe does an implicit "Play" command */
 138
 139         if (_transport_speed != 1.0) {
 140
 141                 /* start_transport() will move from Enabled->Recording, so we
 142                    don't need to do anything here except enable recording.
 143                    its not the same as maybe_enable_record() though, because
 144                    that *can* switch to Recording, which we do not want.
 145                 */
 146
 147                 save_state ("", true);
 148                 g_atomic_int_set (&_record_status, Enabled);
 149                 RecordStateChanged (); /* EMIT SIGNAL */
 150
 151                 request_transport_speed (1.0);
 152
 153         } else {
 154
 155                 enable_record ();
 156         }
 157 }
 158
 159 void
 160 Session::mmc_record_exit (MIDI::MachineControl &/*mmc*/)
 161 {
 162         if (Config->get_mmc_control()) {
 163                 disable_record (false);
 164         }
 165 }
 166
 167 void
 168 Session::mmc_stop (MIDI::MachineControl &/*mmc*/)
 169 {
 170         if (Config->get_mmc_control()) {
 171                 request_stop ();
 172         }
 173 }
 174
 175 void
 176 Session::mmc_pause (MIDI::MachineControl &/*mmc*/)
 177 {
 178         if (Config->get_mmc_control()) {
 179
 180                 /* We support RECORD_PAUSE, so the spec says that
 181                    we must interpret PAUSE like RECORD_PAUSE if
 182                    recording.
 183                 */
 184
 185                 if (actively_recording()) {
 186                         maybe_enable_record ();
 187                 } else {
 188                         request_stop ();
 189                 }
 190         }
 191 }
 192
 193 static bool step_queued = false;
 194
 195 void
 196 Session::mmc_step (MIDI::MachineControl &/*mmc*/, int steps)
 197 {
 198         if (!Config->get_mmc_control()) {
 199                 return;
 200         }
 201
 202         struct timeval now;
 203         struct timeval diff = { 0, 0 };
 204
 205         gettimeofday (&now, 0);
 206
 207         timersub (&now, &last_mmc_step, &diff);
 208
 209         gettimeofday (&now, 0);
 210         timersub (&now, &last_mmc_step, &diff);
 211
 212         if (last_mmc_step.tv_sec != 0 && (diff.tv_usec + (diff.tv_sec * 1000000)) < _engine.usecs_per_cycle()) {
 213                 return;
 214         }
 215
 216         double diff_secs = diff.tv_sec + (diff.tv_usec / 1000000.0);
 217         double cur_speed = (((steps * 0.5) * timecode_frames_per_second()) / diff_secs) / timecode_frames_per_second();
 218
 219         if (_transport_speed == 0 || cur_speed * _transport_speed < 0) {
 220                 /* change direction */
 221                 step_speed = cur_speed;
 222         } else {
 223                 step_speed = (0.6 * step_speed) + (0.4 * cur_speed);
 224         }
 225
 226         step_speed *= 0.25;
 227
 228 #if 0
 229         cerr << "delta = " << diff_secs
 230              << " ct = " << _transport_speed
 231              << " steps = " << steps
 232              << " new speed = " << cur_speed
 233              << " speed = " << step_speed
 234              << endl;
 235 #endif
 236
 237         request_transport_speed (step_speed);
 238         last_mmc_step = now;
 239
 240         if (!step_queued) {
 241                 if (midi_control_ui) {
 242                         RefPtr<TimeoutSource> tsrc = TimeoutSource::create (100);
 243                         tsrc->connect (sigc::mem_fun (*this, &Session::mmc_step_timeout));
 244                         tsrc->attach (midi_control_ui->main_loop()->get_context());
 245                         step_queued = true;
 246                 }
 247         }
 248 }
 249
 250 void
 251 Session::mmc_rewind (MIDI::MachineControl &/*mmc*/)
 252 {
 253         if (Config->get_mmc_control()) {
 254                 request_transport_speed(-8.0f);
 255         }
 256 }
 257
 258 void
 259 Session::mmc_fast_forward (MIDI::MachineControl &/*mmc*/)
 260 {
 261         if (Config->get_mmc_control()) {
 262                 request_transport_speed(8.0f);
 263         }
 264 }
 265
 266 void
 267 Session::mmc_locate (MIDI::MachineControl &/*mmc*/, const MIDI::byte* mmc_tc)
 268 {
 269         if (!Config->get_mmc_control()) {
 270                 return;
 271         }
 272
 273         nframes_t target_frame;
 274         Timecode::Time timecode;
 275
 276         timecode.hours = mmc_tc[0] & 0xf;
 277         timecode.minutes = mmc_tc[1];
 278         timecode.seconds = mmc_tc[2];
 279         timecode.frames = mmc_tc[3];
 280         timecode.rate = timecode_frames_per_second();
 281         timecode.drop = timecode_drop_frames();
 282
 283         // Also takes timecode offset into account:
 284         timecode_to_sample( timecode, target_frame, true /* use_offset */, false /* use_subframes */ );
 285
 286         if (target_frame > max_frames) {
 287                 target_frame = max_frames;
 288         }
 289
 290         /* Some (all?) MTC/MMC devices do not send a full MTC frame
 291            at the end of a locate, instead sending only an MMC
 292            locate command. This causes the current position
 293            of an MTC slave to become out of date. Catch this.
 294         */
 295
 296         MTC_Slave* mtcs = dynamic_cast<MTC_Slave*> (_slave);
 297
 298         if (mtcs != 0) {
 299                 // cerr << "Locate *with* MTC slave\n";
 300                 mtcs->handle_locate (mmc_tc);
 301         } else {
 302                 // cerr << "Locate without MTC slave\n";
 303                 request_locate (target_frame, false);
 304         }
 305 }
 306
 307 void
 308 Session::mmc_shuttle (MIDI::MachineControl &/*mmc*/, float speed, bool forw)
 309 {
 310         if (!Config->get_mmc_control()) {
 311                 return;
 312         }
 313
 314         if (Config->get_shuttle_speed_threshold() >= 0 && speed > Config->get_shuttle_speed_threshold()) {
 315                 speed *= Config->get_shuttle_speed_factor();
 316         }
 317
 318         if (forw) {
 319                 request_transport_speed (speed);
 320         } else {
 321                 request_transport_speed (-speed);
 322         }
 323 }
 324
 325 void
 326 Session::mmc_record_enable (MIDI::MachineControl &mmc, size_t trk, bool enabled)
 327 {
 328         if (Config->get_mmc_control()) {
 329
 330                 RouteList::iterator i;
 331                 boost::shared_ptr<RouteList> r = routes.reader();
 332
 333                 for (i = r->begin(); i != r->end(); ++i) {
 334                         AudioTrack *at;
 335
 336                         if ((at = dynamic_cast<AudioTrack*>((*i).get())) != 0) {
 337                                 if (trk == at->remote_control_id()) {
 338                                         at->set_record_enable (enabled, &mmc);
 339                                         break;
 340                                 }
 341                         }
 342                 }
 343         }
 344 }
 345
 346 /** Send MTC Full Frame message (complete Timecode time) for the start of this cycle.
 347  * This resets the MTC code, the next quarter frame message that is sent will be
 348  * the first one with the beginning of this cycle as the new start point.
 349  * @param t time to send.
 350  */
 351 int
 352 Session::send_full_time_code (nframes64_t const t)
 353 {
 354         /* This function could easily send at a given frame offset, but would
 355          * that be useful?  Does ardour do sub-block accurate locating? [DR] */
 356
 357         MIDI::byte msg[10];
 358         Timecode::Time timecode;
 359
 360         _send_timecode_update = false;
 361
 362         if (!session_send_mtc || _slave) {
 363                 return 0;
 364         }
 365
 366         // Get timecode time for the given time
 367         sample_to_timecode (t, timecode, true /* use_offset */, false /* no subframes */);
 368
 369         transmitting_timecode_time = timecode;
 370         outbound_mtc_timecode_frame = t;
 371
 372         // I don't understand this bit yet.. [DR]
 373         if (((mtc_timecode_bits >> 5) != MIDI::MTC_25_FPS) && (transmitting_timecode_time.frames % 2)) {
 374                 // start MTC quarter frame transmission on an even frame
 375                 Timecode::increment (transmitting_timecode_time, config.get_subframes_per_frame());
 376                 outbound_mtc_timecode_frame += (nframes_t) _frames_per_timecode_frame;
 377         }
 378
 379         // Compensate for audio latency
 380         outbound_mtc_timecode_frame += _worst_output_latency;
 381         next_quarter_frame_to_send = 0;
 382
 383         // Sync slave to the same Timecode time as we are on
 384         msg[0] = 0xf0;
 385         msg[1] = 0x7f;
 386         msg[2] = 0x7f;
 387         msg[3] = 0x1;
 388         msg[4] = 0x1;
 389         msg[9] = 0xf7;
 390
 391         msg[5] = mtc_timecode_bits | timecode.hours;
 392         msg[6] = timecode.minutes;
 393         msg[7] = timecode.seconds;
 394         msg[8] = timecode.frames;
 395
 396         // Send message at offset 0, sent time is for the start of this cycle
 397         if (MIDI::Manager::instance()->mtc_output_port()->midimsg (msg, sizeof (msg), 0)) {
 398                 error << _("Session: could not send full MIDI time code") << endmsg;
 399                 return -1;
 400         }
 401
 402         return 0;
 403 }
 404
 405 /** Send MTC (quarter-frame) messages for this cycle.
 406  * Must be called exactly once per cycle from the audio thread.  Realtime safe.
 407  * This function assumes the state of full Timecode is sane, eg. the slave is
 408  * expecting quarter frame messages and has the right frame of reference (any
 409  * full MTC Timecode time messages that needed to be sent should have been sent
 410  * earlier already this cycle by send_full_time_code)
 411  */
 412 int
 413 Session::send_midi_time_code_for_cycle(nframes_t nframes)
 414 {
 415         if (_slave || !session_send_mtc || transmitting_timecode_time.negative || (next_quarter_frame_to_send < 0)) {
 416                 // cerr << "(MTC) Not sending MTC\n";
 417                 return 0;
 418         }
 419
 420         assert (next_quarter_frame_to_send >= 0);
 421         assert (next_quarter_frame_to_send <= 7);
 422
 423         /* Duration of one quarter frame */
 424         nframes_t quarter_frame_duration = ((nframes_t) _frames_per_timecode_frame) >> 2;
 425
 426         DEBUG_TRACE (DEBUG::MTC, string_compose ("TF %1 SF %2 NQ %3 FD %4\n",  _transport_frame, outbound_mtc_timecode_frame,
 427                                                  next_quarter_frame_to_send, quarter_frame_duration));
 428
 429         assert((outbound_mtc_timecode_frame + (next_quarter_frame_to_send * quarter_frame_duration))
 430                         >= _transport_frame);
 431
 432
 433         // Send quarter frames for this cycle
 434         while (_transport_frame + nframes > (outbound_mtc_timecode_frame +
 435                                 (next_quarter_frame_to_send * quarter_frame_duration))) {
 436
 437                 DEBUG_TRACE (DEBUG::MTC, string_compose ("next frame to send: %1\n", next_quarter_frame_to_send));
 438
 439                 switch (next_quarter_frame_to_send) {
 440                         case 0:
 441                                 mtc_msg[1] =  0x00 | (transmitting_timecode_time.frames & 0xf);
 442                                 break;
 443                         case 1:
 444                                 mtc_msg[1] =  0x10 | ((transmitting_timecode_time.frames & 0xf0) >> 4);
 445                                 break;
 446                         case 2:
 447                                 mtc_msg[1] =  0x20 | (transmitting_timecode_time.seconds & 0xf);
 448                                 break;
 449                         case 3:
 450                                 mtc_msg[1] =  0x30 | ((transmitting_timecode_time.seconds & 0xf0) >> 4);
 451                                 break;
 452                         case 4:
 453                                 mtc_msg[1] =  0x40 | (transmitting_timecode_time.minutes & 0xf);
 454                                 break;
 455                         case 5:
 456                                 mtc_msg[1] = 0x50 | ((transmitting_timecode_time.minutes & 0xf0) >> 4);
 457                                 break;
 458                         case 6:
 459                                 mtc_msg[1] = 0x60 | ((mtc_timecode_bits|transmitting_timecode_time.hours) & 0xf);
 460                                 break;
 461                         case 7:
 462                                 mtc_msg[1] = 0x70 | (((mtc_timecode_bits|transmitting_timecode_time.hours) & 0xf0) >> 4);
 463                                 break;
 464                 }
 465
 466                 const nframes_t msg_time = (outbound_mtc_timecode_frame
 467                         + (quarter_frame_duration * next_quarter_frame_to_send));
 468
 469                 // This message must fall within this block or something is broken
 470                 assert(msg_time >= _transport_frame);
 471                 assert(msg_time < _transport_frame + nframes);
 472
 473                 nframes_t out_stamp = msg_time - _transport_frame;
 474                 assert(out_stamp < nframes);
 475
 476                 if (MIDI::Manager::instance()->mtc_output_port()->midimsg (mtc_msg, 2, out_stamp)) {
 477                         error << string_compose(_("Session: cannot send quarter-frame MTC message (%1)"), strerror (errno))
 478                               << endmsg;
 479                         return -1;
 480                 }
 481
 482 #ifndef NDEBUG
 483                 DEBUG_STR_DECL(foo)
 484                 DEBUG_STR_APPEND(foo,"sending ");
 485                 DEBUG_STR_APPEND(foo, transmitting_timecode_time);
 486                 DEBUG_TRACE (DEBUG::MTC, string_compose ("%1 qfm = %2, stamp = %3\n", DEBUG_STR(foo).str(), next_quarter_frame_to_send,
 487                                                          out_stamp));
 488 #endif
 489
 490                 // Increment quarter frame counter
 491                 next_quarter_frame_to_send++;
 492
 493                 if (next_quarter_frame_to_send >= 8) {
 494                         // Wrap quarter frame counter
 495                         next_quarter_frame_to_send = 0;
 496                         // Increment timecode time twice
 497                         Timecode::increment( transmitting_timecode_time, config.get_subframes_per_frame() );
 498                         Timecode::increment( transmitting_timecode_time, config.get_subframes_per_frame() );
 499                         // Re-calculate timing of first quarter frame
 500                         //timecode_to_sample( transmitting_timecode_time, outbound_mtc_timecode_frame, true /* use_offset */, false );
 501                         outbound_mtc_timecode_frame += 8 * quarter_frame_duration;
 502                 }
 503         }
 504
 505         return 0;
 506 }
 507
 508 /***********************************************************************
 509  OUTBOUND MMC STUFF
 510 **********************************************************************/
 511
 512
 513 bool
 514 Session::mmc_step_timeout ()
 515 {
 516         struct timeval now;
 517         struct timeval diff;
 518         double diff_usecs;
 519         gettimeofday (&now, 0);
 520
 521         timersub (&now, &last_mmc_step, &diff);
 522         diff_usecs = diff.tv_sec * 1000000 + diff.tv_usec;
 523
 524         if (diff_usecs > 1000000.0 || fabs (_transport_speed) < 0.0000001) {
 525                 /* too long or too slow, stop transport */
 526                 request_transport_speed (0.0);
 527                 step_queued = false;
 528                 return false;
 529         }
 530
 531         if (diff_usecs < 250000.0) {
 532                 /* too short, just keep going */
 533                 return true;
 534         }
 535
 536         /* slow it down */
 537
 538         request_transport_speed (_transport_speed * 0.75);
 539         return true;
 540 }
 541
 542 /*---------------------------------------------------------------------------
 543   MIDI THREAD
 544   ---------------------------------------------------------------------------*/
 545
 546 int
 547 Session::start_midi_thread ()
 548 {
 549         midi_control_ui = new MidiControlUI (*this);
 550         midi_control_ui->run ();
 551         return 0;
 552 }
 553
 554 void
 555 Session::terminate_midi_thread ()
 556 {
 557         if (midi_control_ui) {
 558                 midi_control_ui->quit ();
 559         }
 560 }
 561
 562