libs/ardour/session_midi.cc

   1 /*
   2   Copyright (C) 1999-2002 Paul Davis
   3
   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.
   8
   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.
  13
  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.
  17
  18 */
  19
  20 #include <string>
  21 #include <cmath>
  22 #include <cerrno>
  23 #include <cassert>
  24 #include <unistd.h>
  25 #include <fcntl.h>
  26 #include <poll.h>
  27
  28 #include <boost/shared_ptr.hpp>
  29
  30 #include <glibmm/main.h>
  31
  32 #include "midi++/mmc.h"
  33 #include "midi++/port.h"
  34 #include "midi++/manager.h"
  35
  36 #include "pbd/error.h"
  37 #include "pbd/pthread_utils.h"
  38
  39 #include "timecode/time.h"
  40
  41 #include "ardour/configuration.h"
  42 #include "ardour/debug.h"
  43 #include "ardour/audioengine.h"
  44 #include "ardour/session.h"
  45 #include "ardour/audio_track.h"
  46 #include "ardour/midi_track.h"
  47 #include "ardour/midi_ui.h"
  48 #include "ardour/audio_diskstream.h"
  49 #include "ardour/slave.h"
  50 #include "ardour/cycles.h"
  51
  52 #include "i18n.h"
  53
  54 using namespace std;
  55 using namespace ARDOUR;
  56 using namespace PBD;
  57 using namespace MIDI;
  58 using namespace Glib;
  59
  60 void
  61 Session::midi_panic()
  62 {
  63         {
  64                 boost::shared_ptr<RouteList> r = routes.reader ();
  65
  66                 for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
  67                         MidiTrack *track = dynamic_cast<MidiTrack*>((*i).get());
  68                         if (track != 0) {
  69                                 track->midi_panic();
  70                         }
  71                 }
  72         }
  73 }
  74
  75 void
  76 Session::setup_midi_control ()
  77 {
  78         outbound_mtc_timecode_frame = 0;
  79         next_quarter_frame_to_send = 0;
  80
  81         /* Set up the qtr frame message */
  82
  83         mtc_msg[0] = 0xf1;
  84         mtc_msg[2] = 0xf1;
  85         mtc_msg[4] = 0xf1;
  86         mtc_msg[6] = 0xf1;
  87         mtc_msg[8] = 0xf1;
  88         mtc_msg[10] = 0xf1;
  89         mtc_msg[12] = 0xf1;
  90         mtc_msg[14] = 0xf1;
  91 }
  92
  93 void
  94 Session::spp_start (Parser &, framepos_t /*timestamp*/)
  95 {
  96         if (Config->get_mmc_control ()) {
  97                 request_transport_speed (1.0);
  98         }
  99 }
 100
 101 void
 102 Session::spp_continue (Parser& ignored, framepos_t timestamp)
 103 {
 104         spp_start (ignored, timestamp);
 105 }
 106
 107 void
 108 Session::spp_stop (Parser&, framepos_t /*timestamp*/)
 109 {
 110         if (Config->get_mmc_control ()) {
 111                 request_stop ();
 112         }
 113 }
 114
 115 void
 116 Session::mmc_deferred_play (MIDI::MachineControl &/*mmc*/)
 117 {
 118         if (Config->get_mmc_control ()) {
 119                 request_transport_speed (1.0);
 120         }
 121 }
 122
 123 void
 124 Session::mmc_record_pause (MIDI::MachineControl &/*mmc*/)
 125 {
 126         if (Config->get_mmc_control ()) {
 127                 maybe_enable_record();
 128         }
 129 }
 130
 131 void
 132 Session::mmc_record_strobe (MIDI::MachineControl &/*mmc*/)
 133 {
 134         if (!Config->get_mmc_control() || (_step_editors > 0)) {
 135                 return;
 136         }
 137
 138         /* record strobe does an implicit "Play" command */
 139
 140         if (_transport_speed != 1.0) {
 141
 142                 /* start_transport() will move from Enabled->Recording, so we
 143                    don't need to do anything here except enable recording.
 144                    its not the same as maybe_enable_record() though, because
 145                    that *can* switch to Recording, which we do not want.
 146                 */
 147
 148                 save_state ("", true);
 149                 g_atomic_int_set (&_record_status, Enabled);
 150                 RecordStateChanged (); /* EMIT SIGNAL */
 151
 152                 request_transport_speed (1.0);
 153
 154         } else {
 155
 156                 enable_record ();
 157         }
 158 }
 159
 160 void
 161 Session::mmc_record_exit (MIDI::MachineControl &/*mmc*/)
 162 {
 163         if (Config->get_mmc_control ()) {
 164                 disable_record (false);
 165         }
 166 }
 167
 168 void
 169 Session::mmc_stop (MIDI::MachineControl &/*mmc*/)
 170 {
 171         if (Config->get_mmc_control ()) {
 172                 request_stop ();
 173         }
 174 }
 175
 176 void
 177 Session::mmc_pause (MIDI::MachineControl &/*mmc*/)
 178 {
 179         if (Config->get_mmc_control ()) {
 180
 181                 /* We support RECORD_PAUSE, so the spec says that
 182                    we must interpret PAUSE like RECORD_PAUSE if
 183                    recording.
 184                 */
 185
 186                 if (actively_recording()) {
 187                         maybe_enable_record ();
 188                 } else {
 189                         request_stop ();
 190                 }
 191         }
 192 }
 193
 194 static bool step_queued = false;
 195
 196 void
 197 Session::mmc_step (MIDI::MachineControl &/*mmc*/, int steps)
 198 {
 199         if (!Config->get_mmc_control ()) {
 200                 return;
 201         }
 202
 203         struct timeval now;
 204         struct timeval diff = { 0, 0 };
 205
 206         gettimeofday (&now, 0);
 207
 208         timersub (&now, &last_mmc_step, &diff);
 209
 210         gettimeofday (&now, 0);
 211         timersub (&now, &last_mmc_step, &diff);
 212
 213         if (last_mmc_step.tv_sec != 0 && (diff.tv_usec + (diff.tv_sec * 1000000)) < _engine.usecs_per_cycle()) {
 214                 return;
 215         }
 216
 217         double diff_secs = diff.tv_sec + (diff.tv_usec / 1000000.0);
 218         double cur_speed = (((steps * 0.5) * timecode_frames_per_second()) / diff_secs) / timecode_frames_per_second();
 219
 220         if (_transport_speed == 0 || cur_speed * _transport_speed < 0) {
 221                 /* change direction */
 222                 step_speed = cur_speed;
 223         } else {
 224                 step_speed = (0.6 * step_speed) + (0.4 * cur_speed);
 225         }
 226
 227         step_speed *= 0.25;
 228
 229 #if 0
 230         cerr << "delta = " << diff_secs
 231              << " ct = " << _transport_speed
 232              << " steps = " << steps
 233              << " new speed = " << cur_speed
 234              << " speed = " << step_speed
 235              << endl;
 236 #endif
 237
 238         request_transport_speed_nonzero (step_speed);
 239         last_mmc_step = now;
 240
 241         if (!step_queued) {
 242                 if (midi_control_ui) {
 243                         RefPtr<TimeoutSource> tsrc = TimeoutSource::create (100);
 244                         tsrc->connect (sigc::mem_fun (*this, &Session::mmc_step_timeout));
 245                         tsrc->attach (midi_control_ui->main_loop()->get_context());
 246                         step_queued = true;
 247                 }
 248         }
 249 }
 250
 251 void
 252 Session::mmc_rewind (MIDI::MachineControl &/*mmc*/)
 253 {
 254         if (Config->get_mmc_control ()) {
 255                 request_transport_speed(-8.0f);
 256         }
 257 }
 258
 259 void
 260 Session::mmc_fast_forward (MIDI::MachineControl &/*mmc*/)
 261 {
 262         if (Config->get_mmc_control ()) {
 263                 request_transport_speed(8.0f);
 264         }
 265 }
 266
 267 void
 268 Session::mmc_locate (MIDI::MachineControl &/*mmc*/, const MIDI::byte* mmc_tc)
 269 {
 270         if (!Config->get_mmc_control ()) {
 271                 return;
 272         }
 273
 274         framepos_t target_frame;
 275         Timecode::Time timecode;
 276
 277         timecode.hours = mmc_tc[0] & 0xf;
 278         timecode.minutes = mmc_tc[1];
 279         timecode.seconds = mmc_tc[2];
 280         timecode.frames = mmc_tc[3];
 281         timecode.rate = timecode_frames_per_second();
 282         timecode.drop = timecode_drop_frames();
 283
 284         // Also takes timecode offset into account:
 285         timecode_to_sample( timecode, target_frame, true /* use_offset */, false /* use_subframes */ );
 286
 287         if (target_frame > max_framepos) {
 288                 target_frame = max_framepos;
 289         }
 290
 291         /* Some (all?) MTC/MMC devices do not send a full MTC frame
 292            at the end of a locate, instead sending only an MMC
 293            locate command. This causes the current position
 294            of an MTC slave to become out of date. Catch this.
 295         */
 296
 297         MTC_Slave* mtcs = dynamic_cast<MTC_Slave*> (_slave);
 298
 299         if (mtcs != 0) {
 300                 // cerr << "Locate *with* MTC slave\n";
 301                 mtcs->handle_locate (mmc_tc);
 302         } else {
 303                 // cerr << "Locate without MTC slave\n";
 304                 request_locate (target_frame, false);
 305         }
 306 }
 307
 308 void
 309 Session::mmc_shuttle (MIDI::MachineControl &/*mmc*/, float speed, bool forw)
 310 {
 311         if (!Config->get_mmc_control ()) {
 312                 return;
 313         }
 314
 315         if (Config->get_shuttle_speed_threshold() >= 0 && speed > Config->get_shuttle_speed_threshold()) {
 316                 speed *= Config->get_shuttle_speed_factor();
 317         }
 318
 319         if (forw) {
 320                 request_transport_speed_nonzero (speed);
 321         } else {
 322                 request_transport_speed_nonzero (-speed);
 323         }
 324 }
 325
 326 void
 327 Session::mmc_record_enable (MIDI::MachineControl &mmc, size_t trk, bool enabled)
 328 {
 329         if (!Config->get_mmc_control ()) {
 330                 return;
 331         }
 332
 333         RouteList::iterator i;
 334         boost::shared_ptr<RouteList> r = routes.reader();
 335
 336         for (i = r->begin(); i != r->end(); ++i) {
 337                 AudioTrack *at;
 338
 339                 if ((at = dynamic_cast<AudioTrack*>((*i).get())) != 0) {
 340                         if (trk == at->remote_control_id()) {
 341                                 at->set_record_enabled (enabled, &mmc);
 342                                 break;
 343                         }
 344                 }
 345         }
 346 }
 347
 348 /** Send MTC Full Frame message (complete Timecode time) for the start of this cycle.
 349  * This resets the MTC code, the next quarter frame message that is sent will be
 350  * the first one with the beginning of this cycle as the new start point.
 351  * @param t time to send.
 352  */
 353 int
 354 Session::send_full_time_code (framepos_t const t)
 355 {
 356         /* This function could easily send at a given frame offset, but would
 357          * that be useful?  Does ardour do sub-block accurate locating? [DR] */
 358
 359         MIDI::byte msg[10];
 360         Timecode::Time timecode;
 361
 362         _send_timecode_update = false;
 363
 364         if (!Config->get_send_mtc() || _slave) {
 365                 return 0;
 366         }
 367
 368         // Get timecode time for the given time
 369         sample_to_timecode (t, timecode, true /* use_offset */, false /* no subframes */);
 370
 371         transmitting_timecode_time = timecode;
 372         outbound_mtc_timecode_frame = t;
 373
 374         // I don't understand this bit yet.. [DR]
 375         if (((mtc_timecode_bits >> 5) != MIDI::MTC_25_FPS) && (transmitting_timecode_time.frames % 2)) {
 376                 // start MTC quarter frame transmission on an even frame
 377                 Timecode::increment (transmitting_timecode_time, config.get_subframes_per_frame());
 378                 outbound_mtc_timecode_frame += _frames_per_timecode_frame;
 379         }
 380
 381         // Compensate for audio latency
 382         outbound_mtc_timecode_frame += worst_playback_latency();
 383         next_quarter_frame_to_send = 0;
 384
 385         // Sync slave to the same Timecode time as we are on
 386         msg[0] = 0xf0;
 387         msg[1] = 0x7f;
 388         msg[2] = 0x7f;
 389         msg[3] = 0x1;
 390         msg[4] = 0x1;
 391         msg[9] = 0xf7;
 392
 393         msg[5] = mtc_timecode_bits | timecode.hours;
 394         msg[6] = timecode.minutes;
 395         msg[7] = timecode.seconds;
 396         msg[8] = timecode.frames;
 397
 398         // Send message at offset 0, sent time is for the start of this cycle
 399         if (MIDI::Manager::instance()->mtc_output_port()->midimsg (msg, sizeof (msg), 0)) {
 400                 error << _("Session: could not send full MIDI time code") << endmsg;
 401                 return -1;
 402         }
 403
 404         _pframes_since_last_mtc = 0;
 405         return 0;
 406 }
 407
 408 /** Send MTC (quarter-frame) messages for this cycle.
 409  * Must be called exactly once per cycle from the process thread.  Realtime safe.
 410  * This function assumes the state of full Timecode is sane, eg. the slave is
 411  * expecting quarter frame messages and has the right frame of reference (any
 412  * full MTC Timecode time messages that needed to be sent should have been sent
 413  * earlier already this cycle by send_full_time_code)
 414  */
 415 int
 416 Session::send_midi_time_code_for_cycle (framepos_t start_frame, framepos_t end_frame, pframes_t nframes)
 417 {
 418         if (_slave || !_send_qf_mtc || transmitting_timecode_time.negative || (next_quarter_frame_to_send < 0)) {
 419                 // cerr << "(MTC) Not sending MTC\n";
 420                 return 0;
 421         }
 422
 423         assert (next_quarter_frame_to_send >= 0);
 424         assert (next_quarter_frame_to_send <= 7);
 425
 426         /* Duration of one quarter frame */
 427         framecnt_t const quarter_frame_duration = ((framecnt_t) _frames_per_timecode_frame) >> 2;
 428
 429         DEBUG_TRACE (DEBUG::MTC, string_compose ("TF %1 SF %2 NQ %3 FD %4\n", start_frame, outbound_mtc_timecode_frame,
 430                                                  next_quarter_frame_to_send, quarter_frame_duration));
 431
 432         assert ((outbound_mtc_timecode_frame + (next_quarter_frame_to_send * quarter_frame_duration)) >= _transport_frame);
 433
 434         /* Send quarter frames for this cycle */
 435         while (end_frame > (outbound_mtc_timecode_frame + (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 framepos_t msg_time = outbound_mtc_timecode_frame + (quarter_frame_duration * next_quarter_frame_to_send);
 467
 468                 // This message must fall within this block or something is broken
 469                 assert (msg_time >= start_frame);
 470                 assert (msg_time < end_frame);
 471
 472                 /* convert from session frames back to JACK frames using the transport speed */
 473                 pframes_t const out_stamp = (msg_time - start_frame) / _transport_speed;
 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_nonzero (_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