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 #include <boost/signals2.hpp>
  33
  34 #include <pbd/pthread_utils.h>
  35 #include <pbd/file_utils.h>
  36 #include <pbd/filesystem.h>
  37 #include <pbd/failed_constructor.h>
  38
  39 #include "ardour/session.h"
  40 #include "ardour/route.h"
  41 #include "ardour/audio_track.h"
  42 #include "ardour/midi_track.h"
  43 #include "ardour/dB.h"
  44 #include "ardour/filesystem_paths.h"
  45
  46 #include "osc.h"
  47 #include "osc_controllable.h"
  48 #include "i18n.h"
  49
  50 using namespace ARDOUR;
  51 using namespace std;
  52 using namespace Glib;
  53
  54 #include "pbd/abstract_ui.cc" // instantiate template
  55
  56 #define ui_bind(f, ...) boost::protect (boost::bind (f, __VA_ARGS__))
  57
  58 OSC* OSC::_instance = 0;
  59
  60 #ifdef DEBUG
  61 static void error_callback(int num, const char *m, const char *path)
  62 {
  63         fprintf(stderr, "liblo server error %d in path %s: %s\n", num, path, m);
  64 }
  65 #else
  66 static void error_callback(int, const char *, const char *)
  67 {
  68
  69 }
  70 #endif
  71
  72 OSC::OSC (Session& s, uint32_t port)
  73         : ControlProtocol (s, "OSC", this)
  74         , AbstractUI<OSCUIRequest> ("osc")
  75         , _port(port)
  76 {
  77         _instance = this;
  78         _shutdown = false;
  79         _osc_server = 0;
  80         _osc_unix_server = 0;
  81         _namespace_root = "/ardour";
  82         _send_route_changes = true;
  83
  84         /* glibmm hack */
  85         local_server = 0;
  86         remote_server = 0;
  87
  88         // "Application Hooks"
  89         session_loaded (s);
  90         session->Exported.connect (*this, ui_bind (&OSC::session_exported, this, _1, _2), this);
  91 }
  92
  93 OSC::~OSC()
  94 {
  95         stop ();
  96         _instance = 0;
  97 }
  98
  99 void
 100 OSC::do_request (OSCUIRequest* req)
 101 {
 102         if (req->type == CallSlot) {
 103
 104                 call_slot (req->the_slot);
 105
 106         } else if (req->type == Quit) {
 107
 108                 stop ();
 109         }
 110 }
 111
 112 int
 113 OSC::set_active (bool yn)
 114 {
 115         if (yn) {
 116                 return start ();
 117         } else {
 118                 return stop ();
 119         }
 120 }
 121
 122 bool
 123 OSC::get_active () const
 124 {
 125         return _osc_server != 0;
 126 }
 127
 128 int
 129 OSC::set_feedback (bool yn)
 130 {
 131         _send_route_changes = yn;
 132         return 0;
 133 }
 134
 135 bool
 136 OSC::get_feedback () const
 137 {
 138         return _send_route_changes;
 139 }
 140
 141 int
 142 OSC::start ()
 143 {
 144         char tmpstr[255];
 145
 146         if (_osc_server) {
 147                 /* already started */
 148                 return 0;
 149         }
 150
 151         for (int j=0; j < 20; ++j) {
 152                 snprintf(tmpstr, sizeof(tmpstr), "%d", _port);
 153
 154                 if ((_osc_server = lo_server_new (tmpstr, error_callback))) {
 155                         break;
 156                 }
 157 #ifdef DEBUG
 158                 cerr << "can't get osc at port: " << _port << endl;
 159 #endif
 160                 _port++;
 161                 continue;
 162         }
 163
 164 #ifdef ARDOUR_OSC_UNIX_SERVER
 165
 166         // APPEARS sluggish for now
 167
 168         // attempt to create unix socket server too
 169
 170         snprintf(tmpstr, sizeof(tmpstr), "/tmp/sooperlooper_XXXXXX");
 171         int fd = mkstemp(tmpstr);
 172
 173         if (fd >= 0 ) {
 174                 unlink (tmpstr);
 175                 close (fd);
 176
 177                 _osc_unix_server = lo_server_new (tmpstr, error_callback);
 178
 179                 if (_osc_unix_server) {
 180                         _osc_unix_socket_path = tmpstr;
 181                 }
 182         }
 183 #endif
 184
 185         cerr << "OSC @ " << get_server_url () << endl;
 186
 187         PBD::sys::path url_file;
 188
 189         if (find_file_in_search_path (ardour_search_path() + system_config_search_path(),
 190                                       "osc_url", url_file)) {
 191                 _osc_url_file = url_file.to_string();
 192                 ofstream urlfile;
 193                 urlfile.open(_osc_url_file.c_str(), ios::trunc);
 194                 if ( urlfile )
 195                 {
 196                         urlfile << get_server_url () << endl;
 197                         urlfile.close();
 198                 }
 199                 else
 200                 {
 201                         cerr << "Couldn't write '" <<  _osc_url_file << "'" <<endl;
 202                 }
 203         }
 204
 205         register_callbacks();
 206
 207         // lo_server_thread_add_method(_sthread, NULL, NULL, OSC::_dummy_handler, this);
 208
 209         /* startup the event loop thread */
 210
 211         BaseUI::run ();
 212
 213         return 0;
 214 }
 215
 216 void
 217 OSC::thread_init ()
 218 {
 219         if (_osc_unix_server) {
 220                 Glib::RefPtr<IOSource> src = IOSource::create (lo_server_get_socket_fd (_osc_unix_server), IO_IN|IO_HUP|IO_ERR);
 221                 src->connect (sigc::bind (sigc::mem_fun (*this, &OSC::osc_input_handler), _osc_unix_server));
 222                 src->attach (_main_loop->get_context());
 223                 local_server = src->gobj();
 224                 g_source_ref (local_server);
 225         }
 226
 227         if (_osc_server) {
 228                 Glib::RefPtr<IOSource> src  = IOSource::create (lo_server_get_socket_fd (_osc_server), IO_IN|IO_HUP|IO_ERR);
 229                 src->connect (sigc::bind (sigc::mem_fun (*this, &OSC::osc_input_handler), _osc_server));
 230                 src->attach (_main_loop->get_context());
 231                 remote_server = src->gobj();
 232                 g_source_ref (remote_server);
 233         }
 234 }
 235
 236 int
 237 OSC::stop ()
 238 {
 239         /* stop main loop */
 240
 241         if (local_server) {
 242                 g_source_destroy (local_server);
 243                 g_source_unref (local_server);
 244                 local_server = 0;
 245         }
 246
 247         if (remote_server) {
 248                 g_source_destroy (remote_server);
 249                 g_source_unref (remote_server);
 250                 remote_server = 0;
 251         }
 252
 253         BaseUI::quit ();
 254
 255         if (_osc_server) {
 256                 int fd = lo_server_get_socket_fd(_osc_server);
 257                 if (fd >=0) {
 258                         close(fd);
 259                 }
 260                 lo_server_free (_osc_server);
 261                 _osc_server = 0;
 262         }
 263
 264         if (_osc_unix_server) {
 265                 int fd = lo_server_get_socket_fd(_osc_unix_server);
 266                 if (fd >=0) {
 267                         close(fd);
 268                 }
 269                 lo_server_free (_osc_unix_server);
 270                 _osc_unix_server = 0;
 271         }
 272
 273         if (!_osc_unix_socket_path.empty()) {
 274                 unlink (_osc_unix_socket_path.c_str());
 275         }
 276
 277         if (!_osc_url_file.empty() ) {
 278                 unlink (_osc_url_file.c_str() );
 279         }
 280
 281         return 0;
 282 }
 283
 284 void
 285 OSC::register_callbacks()
 286 {
 287         lo_server srvs[2];
 288         lo_server serv;
 289
 290         srvs[0] = _osc_server;
 291         srvs[1] = _osc_unix_server;
 292
 293         for (size_t i = 0; i < 2; ++i) {
 294
 295                 if (!srvs[i]) {
 296                         continue;
 297                 }
 298
 299                 serv = srvs[i];
 300
 301                 /* this is a special catchall handler */
 302
 303                 lo_server_add_method (serv, 0, 0, _catchall, this);
 304
 305 #define REGISTER_CALLBACK(serv,path,types, function) lo_server_add_method (serv, path, types, OSC::_ ## function, this)
 306
 307                 REGISTER_CALLBACK (serv, "/ardour/add_marker", "", add_marker);
 308                 REGISTER_CALLBACK (serv, "/ardour/access_action", "s", access_action);
 309                 REGISTER_CALLBACK (serv, "/ardour/loop_toggle", "", loop_toggle);
 310                 REGISTER_CALLBACK (serv, "/ardour/goto_start", "", goto_start);
 311                 REGISTER_CALLBACK (serv, "/ardour/goto_end", "", goto_end);
 312                 REGISTER_CALLBACK (serv, "/ardour/rewind", "", rewind);
 313                 REGISTER_CALLBACK (serv, "/ardour/ffwd", "", ffwd);
 314                 REGISTER_CALLBACK (serv, "/ardour/transport_stop", "", transport_stop);
 315                 REGISTER_CALLBACK (serv, "/ardour/transport_play", "", transport_play);
 316                 REGISTER_CALLBACK (serv, "/ardour/set_transport_speed", "f", set_transport_speed);
 317                 REGISTER_CALLBACK (serv, "/ardour/save_state", "", save_state);
 318                 REGISTER_CALLBACK (serv, "/ardour/prev_marker", "", prev_marker);
 319                 REGISTER_CALLBACK (serv, "/ardour/next_marker", "", next_marker);
 320                 REGISTER_CALLBACK (serv, "/ardour/undo", "", undo);
 321                 REGISTER_CALLBACK (serv, "/ardour/redo", "", redo);
 322                 REGISTER_CALLBACK (serv, "/ardour/toggle_punch_in", "", toggle_punch_in);
 323                 REGISTER_CALLBACK (serv, "/ardour/toggle_punch_out", "", toggle_punch_out);
 324                 REGISTER_CALLBACK (serv, "/ardour/rec_enable_toggle", "", rec_enable_toggle);
 325                 REGISTER_CALLBACK (serv, "/ardour/toggle_all_rec_enables", "", toggle_all_rec_enables);
 326
 327                 REGISTER_CALLBACK (serv, "/ardour/routes/mute", "ii", route_mute);
 328                 REGISTER_CALLBACK (serv, "/ardour/routes/solo", "ii", route_solo);
 329                 REGISTER_CALLBACK (serv, "/ardour/routes/recenable", "ii", route_recenable);
 330                 REGISTER_CALLBACK (serv, "/ardour/routes/gainabs", "if", route_set_gain_abs);
 331                 REGISTER_CALLBACK (serv, "/ardour/routes/gaindB", "if", route_set_gain_dB);
 332
 333
 334 #if 0
 335                 /* still not-really-standardized query interface */
 336                 REGISTER_CALLBACK (serv, "/ardour/*/#current_value", "", current_value);
 337                 REGISTER_CALLBACK (serv, "/ardour/set", "", set);
 338 #endif
 339
 340 #if 0
 341                 // un/register_update args= s:ctrl s:returl s:retpath
 342                 lo_server_add_method(serv, "/register_update", "sss", OSC::global_register_update_handler, this);
 343                 lo_server_add_method(serv, "/unregister_update", "sss", OSC::global_unregister_update_handler, this);
 344                 lo_server_add_method(serv, "/register_auto_update", "siss", OSC::global_register_auto_update_handler, this);
 345                 lo_server_add_method(serv, "/unregister_auto_update", "sss", OSC::_global_unregister_auto_update_handler, this);
 346 #endif
 347         }
 348 }
 349
 350 bool
 351 OSC::osc_input_handler (IOCondition ioc, lo_server srv)
 352 {
 353         if (ioc & ~IO_IN) {
 354                 return false;
 355         }
 356
 357         if (ioc & IO_IN) {
 358                 lo_server_recv (srv);
 359         }
 360
 361         return true;
 362 }
 363
 364 std::string
 365 OSC::get_server_url()
 366 {
 367         string url;
 368         char * urlstr;
 369
 370         if (_osc_server) {
 371                 urlstr = lo_server_get_url (_osc_server);
 372                 url = urlstr;
 373                 free (urlstr);
 374         }
 375
 376         return url;
 377 }
 378
 379 std::string
 380 OSC::get_unix_server_url()
 381 {
 382         string url;
 383         char * urlstr;
 384
 385         if (_osc_unix_server) {
 386                 urlstr = lo_server_get_url (_osc_unix_server);
 387                 url = urlstr;
 388                 free (urlstr);
 389         }
 390
 391         return url;
 392 }
 393
 394
 395 void
 396 OSC::current_value_query (const char* path, size_t len, lo_arg **argv, int argc, lo_message msg)
 397 {
 398         char* subpath;
 399
 400         subpath = (char*) malloc (len-15+1);
 401         memcpy (subpath, path, len-15);
 402         subpath[len-15] = '\0';
 403
 404         send_current_value (subpath, argv, argc, msg);
 405
 406         free (subpath);
 407 }
 408
 409 void
 410 OSC::send_current_value (const char* path, lo_arg** argv, int argc, lo_message msg)
 411 {
 412         if (!session) {
 413                 return;
 414         }
 415
 416         lo_message reply = lo_message_new ();
 417         boost::shared_ptr<Route> r;
 418         int id;
 419
 420         lo_message_add_string (reply, path);
 421
 422         if (argc == 0) {
 423                 lo_message_add_string (reply, "bad syntax");
 424         } else {
 425                 id = argv[0]->i;
 426                 r = session->route_by_remote_id (id);
 427
 428                 if (!r) {
 429                         lo_message_add_string (reply, "not found");
 430                 } else {
 431
 432                         if (strcmp (path, "/routes/state") == 0) {
 433
 434                                 if (boost::dynamic_pointer_cast<AudioTrack>(r)) {
 435                                         lo_message_add_string (reply, "AT");
 436                                 } else if (boost::dynamic_pointer_cast<MidiTrack>(r)) {
 437                                         lo_message_add_string (reply, "MT");
 438                                 } else {
 439                                         lo_message_add_string (reply, "B");
 440                                 }
 441
 442                                 lo_message_add_string (reply, r->name().c_str());
 443                                 lo_message_add_int32 (reply, r->n_inputs().n_audio());
 444                                 lo_message_add_int32 (reply, r->n_outputs().n_audio());
 445                                 lo_message_add_int32 (reply, r->muted());
 446                                 lo_message_add_int32 (reply, r->soloed());
 447
 448                         } else if (strcmp (path, "/routes/mute") == 0) {
 449
 450                                 lo_message_add_int32 (reply, (float) r->muted());
 451
 452                         } else if (strcmp (path, "/routes/solo") == 0) {
 453
 454                                 lo_message_add_int32 (reply, r->soloed());
 455                         }
 456                 }
 457         }
 458
 459         lo_send_message (lo_message_get_source (msg), "#reply", reply);
 460         lo_message_free (reply);
 461 }
 462
 463 int
 464 OSC::_catchall (const char *path, const char *types, lo_arg **argv, int argc, void *data, void *user_data)
 465 {
 466         return ((OSC*)user_data)->catchall (path, types, argv, argc, data);
 467 }
 468
 469 int
 470 OSC::catchall (const char *path, const char *types, lo_arg **argv, int argc, lo_message msg)
 471 {
 472         size_t len;
 473         int ret = 1; /* unhandled */
 474
 475         cerr << "Received a message, path = " << path << " types = \""
 476              << (types ? types : "NULL") << '"' << endl;
 477
 478         /* 15 for /#current_value plus 2 for /<path> */
 479
 480         len = strlen (path);
 481
 482         if (len >= 17 && !strcmp (&path[len-15], "/#current_value")) {
 483                 current_value_query (path, len, argv, argc, msg);
 484                 ret = 0;
 485
 486         } else if (strcmp (path, "/routes/listen") == 0) {
 487
 488                 cerr << "set up listener\n";
 489
 490                 lo_message reply = lo_message_new ();
 491
 492                 if (argc <= 0) {
 493                         lo_message_add_string (reply, "syntax error");
 494                 } else {
 495                         for (int n = 0; n < argc; ++n) {
 496
 497                                 boost::shared_ptr<Route> r = session->route_by_remote_id (argv[n]->i);
 498
 499                                 if (!r) {
 500                                         lo_message_add_string (reply, "not found");
 501                                         cerr << "no such route\n";
 502                                         break;
 503                                 } else {
 504                                         cerr << "add listener\n";
 505                                         listen_to_route (r, lo_message_get_source (msg));
 506                                         lo_message_add_int32 (reply, argv[n]->i);
 507                                 }
 508                         }
 509                 }
 510
 511                 lo_send_message (lo_message_get_source (msg), "#reply", reply);
 512                 lo_message_free (reply);
 513
 514         } else if (strcmp (path, "/routes/ignore") == 0) {
 515
 516                 for (int n = 0; n < argc; ++n) {
 517
 518                         boost::shared_ptr<Route> r = session->route_by_remote_id (argv[n]->i);
 519
 520                         if (r) {
 521                                 end_listen (r, lo_message_get_source (msg));
 522                         }
 523                 }
 524         }
 525
 526         return ret;
 527 }
 528
 529 void
 530 OSC::listen_to_route (boost::shared_ptr<Route> route, lo_address addr)
 531 {
 532         Controllables::iterator x;
 533         bool route_exists = false;
 534
 535         cerr << "listen to route\n";
 536
 537         /* avoid duplicate listens */
 538
 539         for (x = controllables.begin(); x != controllables.end(); ++x) {
 540
 541                 OSCRouteControllable* rc;
 542
 543                 if ((rc = dynamic_cast<OSCRouteControllable*>(*x)) != 0) {
 544
 545                         if (rc->route() == route) {
 546                                 route_exists = true;
 547
 548                                 /* XXX NEED lo_address_equal() */
 549
 550                                 if (rc->address() == addr) {
 551                                         return;
 552                                 }
 553                         }
 554                 }
 555         }
 556
 557         cerr << "listener binding to signals\n";
 558
 559         OSCControllable* c;
 560         string path;
 561
 562         path = X_("/route/solo");
 563         c = new OSCRouteControllable (addr, path, route->solo_control(), route);
 564         controllables.push_back (c);
 565
 566         path = X_("/route/mute");
 567         c = new OSCRouteControllable (addr, path, route->mute_control(), route);
 568         controllables.push_back (c);
 569
 570         path = X_("/route/gain");
 571         c = new OSCRouteControllable (addr, path, route->gain_control(), route);
 572         controllables.push_back (c);
 573
 574         cerr << "Now have " << controllables.size() << " controllables\n";
 575
 576         /* if there is no existing controllable related to this route, make sure we clean up
 577            if it is ever deleted.
 578         */
 579
 580         if (!route_exists) {
 581                 route->DropReferences.connect (*this, boost::bind (&OSC::drop_route, this, boost::weak_ptr<Route> (route)), this);
 582         }
 583 }
 584
 585 void
 586 OSC::drop_route (boost::weak_ptr<Route> wr)
 587 {
 588         boost::shared_ptr<Route> r = wr.lock ();
 589
 590         if (!r) {
 591                 return;
 592         }
 593
 594         for (Controllables::iterator x = controllables.begin(); x != controllables.end();) {
 595
 596                 OSCRouteControllable* rc;
 597
 598                 if ((rc = dynamic_cast<OSCRouteControllable*>(*x)) != 0) {
 599                         if (rc->route() == r) {
 600                                 delete *x;
 601                                 x = controllables.erase (x);
 602                         } else {
 603                                 ++x;
 604                         }
 605                 } else {
 606                         ++x;
 607                 }
 608         }
 609 }
 610
 611 void
 612 OSC::end_listen (boost::shared_ptr<Route> r, lo_address addr)
 613 {
 614         Controllables::iterator x;
 615
 616         for (x = controllables.begin(); x != controllables.end(); ++x) {
 617
 618                 OSCRouteControllable* rc;
 619
 620                 if ((rc = dynamic_cast<OSCRouteControllable*>(*x)) != 0) {
 621
 622                         /* XXX NEED lo_address_equal () */
 623
 624                         if (rc->route() == r && rc->address() == addr) {
 625                                 controllables.erase (x);
 626                                 return;
 627                         }
 628                 }
 629         }
 630 }
 631
 632 // "Application Hook" Handlers //
 633 void
 634 OSC::session_loaded( Session& s ) {
 635         lo_address listener = lo_address_new( NULL, "7770" );
 636         lo_send( listener, "/session/loaded", "ss", s.path().c_str(), s.name().c_str() );
 637 }
 638
 639 void
 640 OSC::session_exported( std::string path, std::string name ) {
 641         lo_address listener = lo_address_new( NULL, "7770" );
 642         lo_send( listener, "/session/exported", "ss", path.c_str(), name.c_str() );
 643 }
 644
 645 // end "Application Hook" Handlers //
 646
 647 /* path callbacks */
 648
 649 int
 650 OSC::current_value (const char */*path*/, const char */*types*/, lo_arg **/*argv*/, int /*argc*/, void */*data*/, void* /*user_data*/)
 651 {
 652 #if 0
 653         const char* returl;
 654
 655         if (argc < 3 || types == 0 || strlen (types) < 3 || types[0] != 's' || types[1] != 's' || types[2] != s) {
 656                 return 1;
 657         }
 658
 659         const char *returl = argv[1]->s;
 660         lo_address addr = find_or_cache_addr (returl);
 661
 662         const char *retpath = argv[2]->s;
 663
 664
 665         if (strcmp (argv[0]->s, "transport_frame") == 0) {
 666
 667                 if (session) {
 668                         lo_send (addr, retpath, "i", session->transport_frame());
 669                 }
 670
 671         } else if (strcmp (argv[0]->s, "transport_speed") == 0) {
 672
 673                 if (session) {
 674                         lo_send (addr, retpath, "i", session->transport_frame());
 675                 }
 676
 677         } else if (strcmp (argv[0]->s, "transport_locked") == 0) {
 678
 679                 if (session) {
 680                         lo_send (addr, retpath, "i", session->transport_frame());
 681                 }
 682
 683         } else if (strcmp (argv[0]->s, "punch_in") == 0) {
 684
 685                 if (session) {
 686                         lo_send (addr, retpath, "i", session->transport_frame());
 687                 }
 688
 689         } else if (strcmp (argv[0]->s, "punch_out") == 0) {
 690
 691                 if (session) {
 692                         lo_send (addr, retpath, "i", session->transport_frame());
 693                 }
 694
 695         } else if (strcmp (argv[0]->s, "rec_enable") == 0) {
 696
 697                 if (session) {
 698                         lo_send (addr, retpath, "i", session->transport_frame());
 699                 }
 700
 701         } else {
 702
 703                 /* error */
 704         }
 705 #endif
 706         return 0;
 707 }
 708
 709 int
 710 OSC::route_mute (int rid, int yn)
 711 {
 712         if (!session) return -1;
 713
 714         boost::shared_ptr<Route> r = session->route_by_remote_id (rid);
 715
 716         if (r) {
 717                 r->set_mute (yn, this);
 718         }
 719         return 0;
 720 }
 721
 722 int
 723 OSC::route_solo (int rid, int yn)
 724 {
 725         if (!session) return -1;
 726
 727         boost::shared_ptr<Route> r = session->route_by_remote_id (rid);
 728
 729         if (r) {
 730                 r->set_solo (yn, this);
 731         }
 732         return 0;
 733 }
 734
 735 int
 736 OSC::route_recenable (int rid, int yn)
 737 {
 738         if (!session) return -1;
 739
 740         boost::shared_ptr<Route> r = session->route_by_remote_id (rid);
 741
 742         if (r) {
 743                 r->set_record_enable (yn, this);
 744         }
 745         return 0;
 746 }
 747
 748 int
 749 OSC::route_set_gain_abs (int rid, float level)
 750 {
 751         if (!session) return -1;
 752
 753         boost::shared_ptr<Route> r = session->route_by_remote_id (rid);
 754
 755         if (r) {
 756                 r->set_gain (level, this);
 757         }
 758
 759         return 0;
 760 }
 761
 762 int
 763 OSC::route_set_gain_dB (int rid, float dB)
 764 {
 765         if (!session) return -1;
 766
 767         boost::shared_ptr<Route> r = session->route_by_remote_id (rid);
 768
 769         if (r) {
 770                 r->set_gain (dB_to_coefficient (dB), this);
 771         }
 772
 773         return 0;
 774 }
 775
 776 XMLNode&
 777 OSC::get_state ()
 778 {
 779         return *(new XMLNode ("OSC"));
 780 }
 781
 782 int
 783 OSC::set_state (const XMLNode&, int /*version*/)
 784 {
 785         return 0;
 786 }