libs/surfaces/osc/osc.cc

   1 /*
   2  * Copyright (C) 2006 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  *
  18  */
  19
  20 #include <iostream>
  21 #include <fstream>
  22 #include <cstdio>
  23 #include <cstdlib>
  24 #include <cerrno>
  25 #include <algorithm>
  26
  27 #include <sys/poll.h>
  28 #include <unistd.h>
  29 #include <fcntl.h>
  30
  31 #include <glibmm/miscutils.h>
  32
  33 #include <pbd/pthread_utils.h>
  34 #include <pbd/file_utils.h>
  35 #include <pbd/filesystem.h>
  36 #include <pbd/failed_constructor.h>
  37
  38 #include "ardour/session.h"
  39 #include "ardour/route.h"
  40 #include "ardour/audio_track.h"
  41 #include "ardour/midi_track.h"
  42 #include "ardour/dB.h"
  43 #include "ardour/filesystem_paths.h"
  44
  45 #include "osc.h"
  46 #include "osc_controllable.h"
  47 #include "i18n.h"
  48
  49 using namespace ARDOUR;
  50 using namespace sigc;
  51 using namespace std;
  52 using namespace Glib;
  53
  54
  55 #include "pbd/abstract_ui.cc" // instantiate template
  56
  57 #ifdef DEBUG
  58 static void error_callback(int num, const char *m, const char *path)
  59 {
  60         fprintf(stderr, "liblo server error %d in path %s: %s\n", num, path, m);
  61 }
  62 #else
  63 static void error_callback(int, const char *, const char *)
  64 {
  65
  66 }
  67 #endif
  68
  69 OSC::OSC (Session& s, uint32_t port)
  70         : ControlProtocol (s, "OSC")
  71         , AbstractUI<OSCUIRequest> ("osc")
  72         , _port(port)
  73 {
  74         _shutdown = false;
  75         _osc_server = 0;
  76         _osc_unix_server = 0;
  77         _namespace_root = "/ardour";
  78         _send_route_changes = true;
  79
  80         /* glibmm hack */
  81         local_server = 0;
  82         remote_server = 0;
  83
  84         // "Application Hooks"
  85         session_loaded (s);
  86         session->Exported.connect (mem_fun (*this, &OSC::session_exported));
  87 }
  88
  89 OSC::~OSC()
  90 {
  91         stop ();
  92 }
  93
  94 void
  95 OSC::do_request (OSCUIRequest* req)
  96 {
  97         if (req->type == CallSlot) {
  98
  99                 call_slot (req->the_slot);
 100
 101         } else if (req->type == Quit) {
 102
 103                 stop ();
 104         }
 105 }
 106
 107 int
 108 OSC::set_active (bool yn)
 109 {
 110         if (yn) {
 111                 return start ();
 112         } else {
 113                 return stop ();
 114         }
 115 }
 116
 117 bool
 118 OSC::get_active () const
 119 {
 120         return _osc_server != 0;
 121 }
 122
 123 int
 124 OSC::set_feedback (bool yn)
 125 {
 126         _send_route_changes = yn;
 127         return 0;
 128 }
 129
 130 bool
 131 OSC::get_feedback () const
 132 {
 133         return _send_route_changes;
 134 }
 135
 136 int
 137 OSC::start ()
 138 {
 139         char tmpstr[255];
 140
 141         if (_osc_server) {
 142                 /* already started */
 143                 return 0;
 144         }
 145
 146         for (int j=0; j < 20; ++j) {
 147                 snprintf(tmpstr, sizeof(tmpstr), "%d", _port);
 148
 149                 if ((_osc_server = lo_server_new (tmpstr, error_callback))) {
 150                         break;
 151                 }
 152 #ifdef DEBUG
 153                 cerr << "can't get osc at port: " << _port << endl;
 154 #endif
 155                 _port++;
 156                 continue;
 157         }
 158
 159 #ifdef ARDOUR_OSC_UNIX_SERVER
 160
 161         // APPEARS sluggish for now
 162
 163         // attempt to create unix socket server too
 164
 165         snprintf(tmpstr, sizeof(tmpstr), "/tmp/sooperlooper_XXXXXX");
 166         int fd = mkstemp(tmpstr);
 167
 168         if (fd >= 0 ) {
 169                 unlink (tmpstr);
 170                 close (fd);
 171
 172                 _osc_unix_server = lo_server_new (tmpstr, error_callback);
 173
 174                 if (_osc_unix_server) {
 175                         _osc_unix_socket_path = tmpstr;
 176                 }
 177         }
 178 #endif
 179
 180         cerr << "OSC @ " << get_server_url () << endl;
 181
 182         PBD::sys::path url_file;
 183
 184         if (find_file_in_search_path (ardour_search_path() + system_config_search_path(),
 185                                       "osc_url", url_file)) {
 186                 _osc_url_file = url_file.to_string();
 187                 ofstream urlfile;
 188                 urlfile.open(_osc_url_file.c_str(), ios::trunc);
 189                 if ( urlfile )
 190                 {
 191                         urlfile << get_server_url () << endl;
 192                         urlfile.close();
 193                 }
 194                 else
 195                 {
 196                         cerr << "Couldn't write '" <<  _osc_url_file << "'" <<endl;
 197                 }
 198         }
 199
 200         register_callbacks();
 201
 202         // lo_server_thread_add_method(_sthread, NULL, NULL, OSC::_dummy_handler, this);
 203
 204         /* startup the event loop thread */
 205
 206         BaseUI::run ();
 207
 208         return 0;
 209 }
 210
 211 void
 212 OSC::thread_init ()
 213 {
 214         if (_osc_unix_server) {
 215                 Glib::RefPtr<IOSource> src = IOSource::create (lo_server_get_socket_fd (_osc_unix_server), IO_IN|IO_HUP|IO_ERR);
 216                 src->connect (bind (sigc::mem_fun (*this, &OSC::osc_input_handler), _osc_unix_server));
 217                 src->attach (_main_loop->get_context());
 218                 local_server = src->gobj();
 219                 g_source_ref (local_server);
 220         }
 221
 222         if (_osc_server) {
 223                 Glib::RefPtr<IOSource> src  = IOSource::create (lo_server_get_socket_fd (_osc_server), IO_IN|IO_HUP|IO_ERR);
 224                 src->connect (bind (sigc::mem_fun (*this, &OSC::osc_input_handler), _osc_server));
 225                 src->attach (_main_loop->get_context());
 226                 remote_server = src->gobj();
 227                 g_source_ref (remote_server);
 228         }
 229 }
 230
 231 int
 232 OSC::stop ()
 233 {
 234         /* stop main loop */
 235
 236         if (local_server) {
 237                 g_source_destroy (local_server);
 238                 g_source_unref (local_server);
 239                 local_server = 0;
 240         }
 241
 242         if (remote_server) {
 243                 g_source_destroy (remote_server);
 244                 g_source_unref (remote_server);
 245                 remote_server = 0;
 246         }
 247
 248         BaseUI::quit ();
 249
 250         if (_osc_server) {
 251                 int fd = lo_server_get_socket_fd(_osc_server);
 252                 if (fd >=0) {
 253                         close(fd);
 254                 }
 255                 lo_server_free (_osc_server);
 256                 _osc_server = 0;
 257         }
 258
 259         if (_osc_unix_server) {
 260                 int fd = lo_server_get_socket_fd(_osc_unix_server);
 261                 if (fd >=0) {
 262                         close(fd);
 263                 }
 264                 lo_server_free (_osc_unix_server);
 265                 _osc_unix_server = 0;
 266         }
 267
 268         if (!_osc_unix_socket_path.empty()) {
 269                 unlink (_osc_unix_socket_path.c_str());
 270         }
 271
 272         if (!_osc_url_file.empty() ) {
 273                 unlink (_osc_url_file.c_str() );
 274         }
 275
 276         return 0;
 277 }
 278
 279 void
 280 OSC::register_callbacks()
 281 {
 282         lo_server srvs[2];
 283         lo_server serv;
 284
 285         srvs[0] = _osc_server;
 286         srvs[1] = _osc_unix_server;
 287
 288         for (size_t i = 0; i < 2; ++i) {
 289
 290                 if (!srvs[i]) {
 291                         continue;
 292                 }
 293
 294                 serv = srvs[i];
 295
 296                 /* this is a special catchall handler */
 297
 298                 lo_server_add_method (serv, 0, 0, _catchall, this);
 299
 300 #define REGISTER_CALLBACK(serv,path,types, function) lo_server_add_method (serv, path, types, OSC::_ ## function, this)
 301
 302                 REGISTER_CALLBACK (serv, "/ardour/add_marker", "", add_marker);
 303                 REGISTER_CALLBACK (serv, "/ardour/access_action", "s", access_action);
 304                 REGISTER_CALLBACK (serv, "/ardour/loop_toggle", "", loop_toggle);
 305                 REGISTER_CALLBACK (serv, "/ardour/goto_start", "", goto_start);
 306                 REGISTER_CALLBACK (serv, "/ardour/goto_end", "", goto_end);
 307                 REGISTER_CALLBACK (serv, "/ardour/rewind", "", rewind);
 308                 REGISTER_CALLBACK (serv, "/ardour/ffwd", "", ffwd);
 309                 REGISTER_CALLBACK (serv, "/ardour/transport_stop", "", transport_stop);
 310                 REGISTER_CALLBACK (serv, "/ardour/transport_play", "", transport_play);
 311                 REGISTER_CALLBACK (serv, "/ardour/set_transport_speed", "f", set_transport_speed);
 312                 REGISTER_CALLBACK (serv, "/ardour/save_state", "", save_state);
 313                 REGISTER_CALLBACK (serv, "/ardour/prev_marker", "", prev_marker);
 314                 REGISTER_CALLBACK (serv, "/ardour/next_marker", "", next_marker);
 315                 REGISTER_CALLBACK (serv, "/ardour/undo", "", undo);
 316                 REGISTER_CALLBACK (serv, "/ardour/redo", "", redo);
 317                 REGISTER_CALLBACK (serv, "/ardour/toggle_punch_in", "", toggle_punch_in);
 318                 REGISTER_CALLBACK (serv, "/ardour/toggle_punch_out", "", toggle_punch_out);
 319                 REGISTER_CALLBACK (serv, "/ardour/rec_enable_toggle", "", rec_enable_toggle);
 320                 REGISTER_CALLBACK (serv, "/ardour/toggle_all_rec_enables", "", toggle_all_rec_enables);
 321
 322                 REGISTER_CALLBACK (serv, "/ardour/routes/mute", "ii", route_mute);
 323                 REGISTER_CALLBACK (serv, "/ardour/routes/solo", "ii", route_solo);
 324                 REGISTER_CALLBACK (serv, "/ardour/routes/recenable", "ii", route_recenable);
 325                 REGISTER_CALLBACK (serv, "/ardour/routes/gainabs", "if", route_set_gain_abs);
 326                 REGISTER_CALLBACK (serv, "/ardour/routes/gaindB", "if", route_set_gain_dB);
 327
 328
 329 #if 0
 330                 /* still not-really-standardized query interface */
 331                 REGISTER_CALLBACK (serv, "/ardour/*/#current_value", "", current_value);
 332                 REGISTER_CALLBACK (serv, "/ardour/set", "", set);
 333 #endif
 334
 335 #if 0
 336                 // un/register_update args= s:ctrl s:returl s:retpath
 337                 lo_server_add_method(serv, "/register_update", "sss", OSC::global_register_update_handler, this);
 338                 lo_server_add_method(serv, "/unregister_update", "sss", OSC::global_unregister_update_handler, this);
 339                 lo_server_add_method(serv, "/register_auto_update", "siss", OSC::global_register_auto_update_handler, this);
 340                 lo_server_add_method(serv, "/unregister_auto_update", "sss", OSC::_global_unregister_auto_update_handler, this);
 341 #endif
 342         }
 343 }
 344
 345 bool
 346 OSC::osc_input_handler (IOCondition ioc, lo_server srv)
 347 {
 348         if (ioc & ~IO_IN) {
 349                 return false;
 350         }
 351
 352         if (ioc & IO_IN) {
 353                 lo_server_recv (srv);
 354         }
 355
 356         return true;
 357 }
 358
 359 std::string
 360 OSC::get_server_url()
 361 {
 362         string url;
 363         char * urlstr;
 364
 365         if (_osc_server) {
 366                 urlstr = lo_server_get_url (_osc_server);
 367                 url = urlstr;
 368                 free (urlstr);
 369         }
 370
 371         return url;
 372 }
 373
 374 std::string
 375 OSC::get_unix_server_url()
 376 {
 377         string url;
 378         char * urlstr;
 379
 380         if (_osc_unix_server) {
 381                 urlstr = lo_server_get_url (_osc_unix_server);
 382                 url = urlstr;
 383                 free (urlstr);
 384         }
 385
 386         return url;
 387 }
 388
 389
 390 void
 391 OSC::current_value_query (const char* path, size_t len, lo_arg **argv, int argc, lo_message msg)
 392 {
 393         char* subpath;
 394
 395         subpath = (char*) malloc (len-15+1);
 396         memcpy (subpath, path, len-15);
 397         subpath[len-15] = '\0';
 398
 399         send_current_value (subpath, argv, argc, msg);
 400
 401         free (subpath);
 402 }
 403
 404 void
 405 OSC::send_current_value (const char* path, lo_arg** argv, int argc, lo_message msg)
 406 {
 407         if (!session) {
 408                 return;
 409         }
 410
 411         lo_message reply = lo_message_new ();
 412         boost::shared_ptr<Route> r;
 413         int id;
 414
 415         lo_message_add_string (reply, path);
 416
 417         if (argc == 0) {
 418                 lo_message_add_string (reply, "bad syntax");
 419         } else {
 420                 id = argv[0]->i;
 421                 r = session->route_by_remote_id (id);
 422
 423                 if (!r) {
 424                         lo_message_add_string (reply, "not found");
 425                 } else {
 426
 427                         if (strcmp (path, "/routes/state") == 0) {
 428
 429                                 if (boost::dynamic_pointer_cast<AudioTrack>(r)) {
 430                                         lo_message_add_string (reply, "AT");
 431                                 } else if (boost::dynamic_pointer_cast<MidiTrack>(r)) {
 432                                         lo_message_add_string (reply, "MT");
 433                                 } else {
 434                                         lo_message_add_string (reply, "B");
 435                                 }
 436
 437                                 lo_message_add_string (reply, r->name().c_str());
 438                                 lo_message_add_int32 (reply, r->n_inputs().n_audio());
 439                                 lo_message_add_int32 (reply, r->n_outputs().n_audio());
 440                                 lo_message_add_int32 (reply, r->muted());
 441                                 lo_message_add_int32 (reply, r->soloed());
 442
 443                         } else if (strcmp (path, "/routes/mute") == 0) {
 444
 445                                 lo_message_add_int32 (reply, (float) r->muted());
 446
 447                         } else if (strcmp (path, "/routes/solo") == 0) {
 448
 449                                 lo_message_add_int32 (reply, r->soloed());
 450                         }
 451                 }
 452         }
 453
 454         lo_send_message (lo_message_get_source (msg), "#reply", reply);
 455         lo_message_free (reply);
 456 }
 457
 458 int
 459 OSC::_catchall (const char *path, const char *types, lo_arg **argv, int argc, void *data, void *user_data)
 460 {
 461         return ((OSC*)user_data)->catchall (path, types, argv, argc, data);
 462 }
 463
 464 int
 465 OSC::catchall (const char *path, const char *types, lo_arg **argv, int argc, lo_message msg)
 466 {
 467         size_t len;
 468         int ret = 1; /* unhandled */
 469
 470         cerr << "Received a message, path = " << path << " types = \""
 471              << (types ? types : "NULL") << '"' << endl;
 472
 473         /* 15 for /#current_value plus 2 for /<path> */
 474
 475         len = strlen (path);
 476
 477         if (len >= 17 && !strcmp (&path[len-15], "/#current_value")) {
 478                 current_value_query (path, len, argv, argc, msg);
 479                 ret = 0;
 480
 481         } else if (strcmp (path, "/routes/listen") == 0) {
 482
 483                 cerr << "set up listener\n";
 484
 485                 lo_message reply = lo_message_new ();
 486
 487                 if (argc <= 0) {
 488                         lo_message_add_string (reply, "syntax error");
 489                 } else {
 490                         for (int n = 0; n < argc; ++n) {
 491
 492                                 boost::shared_ptr<Route> r = session->route_by_remote_id (argv[n]->i);
 493
 494                                 if (!r) {
 495                                         lo_message_add_string (reply, "not found");
 496                                         cerr << "no such route\n";
 497                                         break;
 498                                 } else {
 499                                         cerr << "add listener\n";
 500                                         listen_to_route (r, lo_message_get_source (msg));
 501                                         lo_message_add_int32 (reply, argv[n]->i);
 502                                 }
 503                         }
 504                 }
 505
 506                 lo_send_message (lo_message_get_source (msg), "#reply", reply);
 507                 lo_message_free (reply);
 508
 509         } else if (strcmp (path, "/routes/ignore") == 0) {
 510
 511                 for (int n = 0; n < argc; ++n) {
 512
 513                         boost::shared_ptr<Route> r = session->route_by_remote_id (argv[n]->i);
 514
 515                         if (r) {
 516                                 end_listen (r, lo_message_get_source (msg));
 517                         }
 518                 }
 519         }
 520
 521         return ret;
 522 }
 523
 524 void
 525 OSC::listen_to_route (boost::shared_ptr<Route> route, lo_address addr)
 526 {
 527         Controllables::iterator x;
 528         bool route_exists = false;
 529
 530         cerr << "listen to route\n";
 531
 532         /* avoid duplicate listens */
 533
 534         for (x = controllables.begin(); x != controllables.end(); ++x) {
 535
 536                 OSCRouteControllable* rc;
 537
 538                 if ((rc = dynamic_cast<OSCRouteControllable*>(*x)) != 0) {
 539
 540                         if (rc->route() == route) {
 541                                 route_exists = true;
 542
 543                                 /* XXX NEED lo_address_equal() */
 544
 545                                 if (rc->address() == addr) {
 546                                         return;
 547                                 }
 548                         }
 549                 }
 550         }
 551
 552         cerr << "listener binding to signals\n";
 553
 554         OSCControllable* c;
 555         string path;
 556
 557         path = X_("/route/solo");
 558         c = new OSCRouteControllable (addr, path, route->solo_control(), route);
 559         controllables.push_back (c);
 560
 561         path = X_("/route/mute");
 562         c = new OSCRouteControllable (addr, path, route->mute_control(), route);
 563         controllables.push_back (c);
 564
 565         path = X_("/route/gain");
 566         c = new OSCRouteControllable (addr, path, route->gain_control(), route);
 567         controllables.push_back (c);
 568
 569         cerr << "Now have " << controllables.size() << " controllables\n";
 570
 571         /* if there is no existing controllable related to this route, make sure we clean up
 572            if it is ever deleted.
 573         */
 574
 575         if (!route_exists) {
 576                 route->GoingAway.connect (bind (mem_fun (*this, &OSC::drop_route), boost::weak_ptr<Route> (route)));
 577         }
 578 }
 579
 580 void
 581 OSC::drop_route (boost::weak_ptr<Route> wr)
 582 {
 583         boost::shared_ptr<Route> r = wr.lock ();
 584
 585         if (!r) {
 586                 return;
 587         }
 588
 589         for (Controllables::iterator x = controllables.begin(); x != controllables.end();) {
 590
 591                 OSCRouteControllable* rc;
 592
 593                 if ((rc = dynamic_cast<OSCRouteControllable*>(*x)) != 0) {
 594                         if (rc->route() == r) {
 595                                 delete *x;
 596                                 x = controllables.erase (x);
 597                         } else {
 598                                 ++x;
 599                         }
 600                 } else {
 601                         ++x;
 602                 }
 603         }
 604 }
 605
 606 void
 607 OSC::end_listen (boost::shared_ptr<Route> r, lo_address addr)
 608 {
 609         Controllables::iterator x;
 610
 611         for (x = controllables.begin(); x != controllables.end(); ++x) {
 612
 613                 OSCRouteControllable* rc;
 614
 615                 if ((rc = dynamic_cast<OSCRouteControllable*>(*x)) != 0) {
 616
 617                         /* XXX NEED lo_address_equal () */
 618
 619                         if (rc->route() == r && rc->address() == addr) {
 620                                 controllables.erase (x);
 621                                 return;
 622                         }
 623                 }
 624         }
 625 }
 626
 627 // "Application Hook" Handlers //
 628 void
 629 OSC::session_loaded( Session& s ) {
 630         lo_address listener = lo_address_new( NULL, "7770" );
 631         lo_send( listener, "/session/loaded", "ss", s.path().c_str(), s.name().c_str() );
 632 }
 633
 634 void
 635 OSC::session_exported( std::string path, std::string name ) {
 636         lo_address listener = lo_address_new( NULL, "7770" );
 637         lo_send( listener, "/session/exported", "ss", path.c_str(), name.c_str() );
 638 }
 639
 640 // end "Application Hook" Handlers //
 641
 642 /* path callbacks */
 643
 644 int
 645 OSC::current_value (const char */*path*/, const char */*types*/, lo_arg **/*argv*/, int /*argc*/, void */*data*/, void* /*user_data*/)
 646 {
 647 #if 0
 648         const char* returl;
 649
 650         if (argc < 3 || types == 0 || strlen (types) < 3 || types[0] != 's' || types[1] != 's' || types[2] != s) {
 651                 return 1;
 652         }
 653
 654         const char *returl = argv[1]->s;
 655         lo_address addr = find_or_cache_addr (returl);
 656
 657         const char *retpath = argv[2]->s;
 658
 659
 660         if (strcmp (argv[0]->s, "transport_frame") == 0) {
 661
 662                 if (session) {
 663                         lo_send (addr, retpath, "i", session->transport_frame());
 664                 }
 665
 666         } else if (strcmp (argv[0]->s, "transport_speed") == 0) {
 667
 668                 if (session) {
 669                         lo_send (addr, retpath, "i", session->transport_frame());
 670                 }
 671
 672         } else if (strcmp (argv[0]->s, "transport_locked") == 0) {
 673
 674                 if (session) {
 675                         lo_send (addr, retpath, "i", session->transport_frame());
 676                 }
 677
 678         } else if (strcmp (argv[0]->s, "punch_in") == 0) {
 679
 680                 if (session) {
 681                         lo_send (addr, retpath, "i", session->transport_frame());
 682                 }
 683
 684         } else if (strcmp (argv[0]->s, "punch_out") == 0) {
 685
 686                 if (session) {
 687                         lo_send (addr, retpath, "i", session->transport_frame());
 688                 }
 689
 690         } else if (strcmp (argv[0]->s, "rec_enable") == 0) {
 691
 692                 if (session) {
 693                         lo_send (addr, retpath, "i", session->transport_frame());
 694                 }
 695
 696         } else {
 697
 698                 /* error */
 699         }
 700 #endif
 701         return 0;
 702 }
 703
 704 int
 705 OSC::route_mute (int rid, int yn)
 706 {
 707         if (!session) return -1;
 708
 709         boost::shared_ptr<Route> r = session->route_by_remote_id (rid);
 710
 711         if (r) {
 712                 r->set_mute (yn, this);
 713         }
 714         return 0;
 715 }
 716
 717 int
 718 OSC::route_solo (int rid, int yn)
 719 {
 720         if (!session) return -1;
 721
 722         boost::shared_ptr<Route> r = session->route_by_remote_id (rid);
 723
 724         if (r) {
 725                 r->set_solo (yn, this);
 726         }
 727         return 0;
 728 }
 729
 730 int
 731 OSC::route_recenable (int rid, int yn)
 732 {
 733         if (!session) return -1;
 734
 735         boost::shared_ptr<Route> r = session->route_by_remote_id (rid);
 736
 737         if (r) {
 738                 r->set_record_enable (yn, this);
 739         }
 740         return 0;
 741 }
 742
 743 int
 744 OSC::route_set_gain_abs (int rid, float level)
 745 {
 746         if (!session) return -1;
 747
 748         boost::shared_ptr<Route> r = session->route_by_remote_id (rid);
 749
 750         if (r) {
 751                 r->set_gain (level, this);
 752         }
 753
 754         return 0;
 755 }
 756
 757 int
 758 OSC::route_set_gain_dB (int rid, float dB)
 759 {
 760         if (!session) return -1;
 761
 762         boost::shared_ptr<Route> r = session->route_by_remote_id (rid);
 763
 764         if (r) {
 765                 r->set_gain (dB_to_coefficient (dB), this);
 766         }
 767
 768         return 0;
 769 }
 770
 771 XMLNode&
 772 OSC::get_state ()
 773 {
 774         return *(new XMLNode ("OSC"));
 775 }
 776
 777 int
 778 OSC::set_state (const XMLNode&, int /*version*/)
 779 {
 780         return 0;
 781 }