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Sourcecode: ardour version File versions

osc.cc

/*
 * Copyright (C) 2006 Paul Davis
 *  
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *  
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *  
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *  
 */

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cerrno>
#include <algorithm>

#include <sys/poll.h>
#include <unistd.h>
#include <fcntl.h>

#include <ardour/osc.h>
#include <ardour/session.h>
#include <ardour/route.h>
#include <ardour/audio_track.h>

#include "i18n.h"

using namespace ARDOUR;
using namespace sigc;
using namespace std;

static void error_callback(int num, const char *m, const char *path)
{
#ifdef DEBUG
      fprintf(stderr, "liblo server error %d in path %s: %s\n", num, path, m);
#endif
}

OSC::OSC (uint32_t port)
      : _port(port)
{
      _shutdown = false;
      _osc_server = 0;
      _osc_unix_server = 0;
      _osc_thread = 0;
}

int
OSC::start ()
{
      char tmpstr[255];

      if (_osc_server) {
            /* already started */
            return 0;
      }
      
      for (int j=0; j < 20; ++j) {
            snprintf(tmpstr, sizeof(tmpstr), "%d", _port);
            
            if ((_osc_server = lo_server_new (tmpstr, error_callback))) {
                  break;
            }
#ifdef DEBUG            
            cerr << "can't get osc at port: " << _port << endl;
#endif
            _port++;
            continue;
      }
      
#ifdef ARDOUR_OSC_UNIX_SERVER
      
      // APPEARS sluggish for now
      
      // attempt to create unix socket server too
      
      snprintf(tmpstr, sizeof(tmpstr), "/tmp/sooperlooper_XXXXXX");
      int fd = mkstemp(tmpstr);
      
      if (fd >= 0 ) {
            unlink (tmpstr);
            close (fd);
            
            _osc_unix_server = lo_server_new (tmpstr, error_callback);
            
            if (_osc_unix_server) {
                  _osc_unix_socket_path = tmpstr;
            }
      }
#endif
      
      cerr << "OSC @ " << get_server_url () << endl;
      
      register_callbacks();
      
      // lo_server_thread_add_method(_sthread, NULL, NULL, OSC::_dummy_handler, this);
            
      if (!init_osc_thread()) {
            return -1;
      }
      return 0;
}

int
OSC::stop ()
{     
      if (_osc_server == 0) {
            /* already stopped */
            return 0;
      }

      // stop server thread
      terminate_osc_thread();

      lo_server_free (_osc_server);
      _osc_server = 0;
      
      if (!_osc_unix_socket_path.empty()) {
            // unlink it
            unlink(_osc_unix_socket_path.c_str());
      }
      
      return 0;
}

OSC::~OSC()
{
      stop ();
}

void
OSC::register_callbacks()
{
      lo_server srvs[2];
      lo_server serv;

      srvs[0] = _osc_server;
      srvs[1] = _osc_unix_server;
      
      for (size_t i = 0; i < 2; ++i) {

            if (!srvs[i]) {
                  continue;
            }

            serv = srvs[i];

#define REGISTER_CALLBACK(serv,path,types, function) lo_server_add_method (serv, path, types, OSC::_ ## function, this)
            
            REGISTER_CALLBACK (serv, "/ardour/add_marker", "", add_marker);
            REGISTER_CALLBACK (serv, "/ardour/loop_toggle", "", loop_toggle);
            REGISTER_CALLBACK (serv, "/ardour/goto_start", "", goto_start);
            REGISTER_CALLBACK (serv, "/ardour/goto_end", "", goto_end);
            REGISTER_CALLBACK (serv, "/ardour/rewind", "", rewind);
            REGISTER_CALLBACK (serv, "/ardour/ffwd", "", ffwd);
            REGISTER_CALLBACK (serv, "/ardour/transport_stop", "", transport_stop);
            REGISTER_CALLBACK (serv, "/ardour/transport_play", "", transport_play);
            REGISTER_CALLBACK (serv, "/ardour/set_transport_speed", "f", set_transport_speed);
            REGISTER_CALLBACK (serv, "/ardour/save_state", "", save_state);
            REGISTER_CALLBACK (serv, "/ardour/prev_marker", "", prev_marker);
            REGISTER_CALLBACK (serv, "/ardour/next_marker", "", next_marker);
            REGISTER_CALLBACK (serv, "/ardour/undo", "", undo);
            REGISTER_CALLBACK (serv, "/ardour/redo", "", redo);
            REGISTER_CALLBACK (serv, "/ardour/toggle_punch_in", "", toggle_punch_in);
            REGISTER_CALLBACK (serv, "/ardour/toggle_punch_out", "", toggle_punch_out);
            REGISTER_CALLBACK (serv, "/ardour/rec_enable_toggle", "", rec_enable_toggle);
            REGISTER_CALLBACK (serv, "/ardour/toggle_all_rec_enables", "", toggle_all_rec_enables);

#if 0
            REGISTER_CALLBACK (serv, "/ardour/*/#current_value", "", current_value);
            REGISTER_CALLBACK (serv, "/ardour/set", "", set);
#endif

#if 0
            // un/register_update args= s:ctrl s:returl s:retpath
            lo_server_add_method(serv, "/register_update", "sss", OSC::global_register_update_handler, this);
            lo_server_add_method(serv, "/unregister_update", "sss", OSC::global_unregister_update_handler, this);
            lo_server_add_method(serv, "/register_auto_update", "siss", OSC::global_register_auto_update_handler, this);
            lo_server_add_method(serv, "/unregister_auto_update", "sss", OSC::_global_unregister_auto_update_handler, this);
#endif
      }
}

bool
OSC::init_osc_thread ()
{
      // create new thread to run server
      if (pipe (_request_pipe)) {
            cerr << "Cannot create osc request signal pipe" <<  strerror (errno) << endl;
            return false;
      }

      if (fcntl (_request_pipe[0], F_SETFL, O_NONBLOCK)) {
            cerr << "osc: cannot set O_NONBLOCK on signal read pipe " << strerror (errno) << endl;
            return false;
      }

      if (fcntl (_request_pipe[1], F_SETFL, O_NONBLOCK)) {
            cerr << "osc: cannot set O_NONBLOCK on signal write pipe " << strerror (errno) << endl;
            return false;
      }
      
      pthread_attr_t attr;
      pthread_attr_init(&attr);
      pthread_attr_setstacksize(&attr, 500000);

      pthread_create (&_osc_thread, &attr, &OSC::_osc_receiver, this);
      if (!_osc_thread) {
            return false;
      }
      pthread_attr_destroy(&attr);

      //pthread_detach (_osc_thread);
      return true;
}

void
OSC::terminate_osc_thread ()
{
      void* status;

      _shutdown = true;
      
      poke_osc_thread ();

      pthread_join (_osc_thread, &status);
}

void
OSC::poke_osc_thread ()
{
      char c;

      if (write (_request_pipe[1], &c, 1) != 1) {
            cerr << "cannot send signal to osc thread! " <<  strerror (errno) << endl;
      }
}

std::string
OSC::get_server_url()
{
      string url;
      char * urlstr;

      if (_osc_server) {
            urlstr = lo_server_get_url (_osc_server);
            url = urlstr;
            free (urlstr);
      }
      
      return url;
}

std::string
OSC::get_unix_server_url()
{
      string url;
      char * urlstr;

      if (_osc_unix_server) {
            urlstr = lo_server_get_url (_osc_unix_server);
            url = urlstr;
            free (urlstr);
      }
      
      return url;
}


/* server thread */

void *
OSC::_osc_receiver(void * arg)
{
      static_cast<OSC*> (arg)->osc_receiver();
      return 0;
}

void
OSC::osc_receiver()
{
      struct pollfd pfd[3];
      int fds[3];
      lo_server srvs[3];
      int nfds = 0;
      int timeout = -1;
      int ret;
      
      fds[0] = _request_pipe[0];
      nfds++;
      
      if (_osc_server && lo_server_get_socket_fd(_osc_server) >= 0) {
            fds[nfds] = lo_server_get_socket_fd(_osc_server);
            srvs[nfds] = _osc_server;
            nfds++;
      }

      if (_osc_unix_server && lo_server_get_socket_fd(_osc_unix_server) >= 0) {
            fds[nfds] = lo_server_get_socket_fd(_osc_unix_server);
            srvs[nfds] = _osc_unix_server;
            nfds++;
      }
      
      
      while (!_shutdown) {

            for (int i=0; i < nfds; ++i) {
                  pfd[i].fd = fds[i];
                  pfd[i].events = POLLIN|POLLPRI|POLLHUP|POLLERR;
                  pfd[i].revents = 0;
            }
            
      again:
            //cerr << "poll on " << nfds << " for " << timeout << endl;
            if ((ret = poll (pfd, nfds, timeout)) < 0) {
                  if (errno == EINTR) {
                        /* gdb at work, perhaps */
                        goto again;
                  }
                  
                  cerr << "OSC thread poll failed: " <<  strerror (errno) << endl;
                  
                  break;
            }

            //cerr << "poll returned " << ret << "  pfd[0].revents = " << pfd[0].revents << "  pfd[1].revents = " << pfd[1].revents << endl;
            
            if (_shutdown) {
                  break;
            }
            
            if ((pfd[0].revents & ~POLLIN)) {
                  cerr << "OSC: error polling extra port" << endl;
                  break;
            }
            
            for (int i=1; i < nfds; ++i) {
                  if (pfd[i].revents & POLLIN)
                  {
                        // this invokes callbacks
                        //cerr << "invoking recv on " << pfd[i].fd << endl;
                        lo_server_recv(srvs[i]);
                  }
            }

      }

      //cerr << "SL engine shutdown" << endl;
      
      if (_osc_server) {
            int fd = lo_server_get_socket_fd(_osc_server);
            if (fd >=0) {
                        // hack around
                  close(fd);
            }
            lo_server_free (_osc_server);
            _osc_server = 0;
      }

      if (_osc_unix_server) {
            cerr << "freeing unix server" << endl;
            lo_server_free (_osc_unix_server);
            _osc_unix_server = 0;
      }
      
      close(_request_pipe[0]);
      close(_request_pipe[1]);
}

void
OSC::set_session (Session& s)
{
      session = &s;
      session->GoingAway.connect (mem_fun (*this, &OSC::session_going_away));
}

void
OSC::session_going_away ()
{
      session = 0;
}

/* path callbacks */

int 
OSC::current_value (const char *path, const char *types, lo_arg **argv, int argc, void *data, void* user_data) 
{ 
#if 0
      const char* returl;

      if (argc < 3 || types == 0 || strlen (types) < 3 || types[0] != 's' || types[1] != 's' || types[2] != s) {
            return 1;
      }

      const char *returl = argv[1]->s;
      lo_address addr = find_or_cache_addr (returl);

      const char *retpath = argv[2]->s;

      
      if (strcmp (argv[0]->s, "transport_frame")) {

            if (session) {
                  lo_send (addr, retpath, "i", session->transport_frame());
            }

      } else if (strcmp (argv[0]->s, "transport_speed")) {

            if (session) {
                  lo_send (addr, retpath, "i", session->transport_frame());
            }

      } else if (strcmp (argv[0]->s, "transport_locked")) {

            if (session) {
                  lo_send (addr, retpath, "i", session->transport_frame());
            }

      } else if (strcmp (argv[0]->s, "punch_in") {

            if (session) {
                  lo_send (addr, retpath, "i", session->transport_frame());
            }

      } else if (strcmp (argv[0]->s, "punch_out") {

            if (session) {
                  lo_send (addr, retpath, "i", session->transport_frame());
            }

      } else if (strcmp (argv[0]->s, "rec_enable") {

            if (session) {
                  lo_send (addr, retpath, "i", session->transport_frame());
            }

      } else {

            /* error */
      }
#endif
      return 0;
}

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