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audioengine.cc

/*
    Copyright (C) 2002 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., 675 Mass Ave, Cambridge, MA 02139, USA.

    $Id: audioengine.cc,v 1.77 2005/05/11 02:27:48 pauld Exp $
*/

#include <unistd.h>
#include <cerrno>
#include <vector>
#include <pbd/pthread_utils.h>

#include <ardour/audioengine.h>
#include <ardour/port.h>
#include <ardour/session.h>
#include <ardour/cycle_timer.h>
#include <ardour/utils.h>
#ifdef VST_SUPPORT
#include <fst.h>
#endif

#include <ardour/timestamps.h>

#include "i18n.h"

using namespace std;
using namespace ARDOUR;

jack_nframes_t Port::short_over_length = 2;
jack_nframes_t Port::long_over_length = 10;

AudioEngine::AudioEngine (string client_name) 
{
      pthread_cond_init (&session_removed, 0);
      session = 0;
      session_remove_pending = false;
      _running = false;
      _has_run = false;
      last_monitor_check = 0;
      monitor_check_interval = max_frames;
      _processed_frames = 0;
      _freewheeling = false;
      _usecs_per_cycle = 0;
      _jack = 0;
      _frame_rate = 0;
      _buffer_size = 0;
      _freewheeling = false;
      _freewheel_thread_registered = false;

      if (connect_to_jack (client_name)) {
            throw NoBackendAvailable ();
      }

}

AudioEngine::~AudioEngine ()
{
      if (_running) {
            jack_client_close (_jack);
      }
}

void
_thread_init_callback (void *arg)
{
      /* make sure that anybody who needs to know about this thread
         knows about it.
      */

      PBD::ThreadCreated (pthread_self(), X_("Audioengine"));

#ifdef VST_SUPPORT
      if (Config->get_use_vst()) {
            fst_adopt_thread ();
      }
#endif
}

int
AudioEngine::start ()
{
      if (!_running) {

            if (session) {
                  jack_nframes_t blocksize = jack_get_buffer_size (_jack);

                  session->set_block_size (blocksize);
                  session->set_frame_rate (jack_get_sample_rate (_jack));

                  /* page in as much of the session process code as we
                     can before we really start running.
                  */

                  session->process (blocksize);
                  session->process (blocksize);
                  session->process (blocksize);
                  session->process (blocksize);
                  session->process (blocksize);
                  session->process (blocksize);
                  session->process (blocksize);
                  session->process (blocksize);
            }

            _processed_frames = 0;
            last_monitor_check = 0;

            jack_on_shutdown (_jack, halted, this);
            jack_set_graph_order_callback (_jack, _graph_order_callback, this);
            jack_set_thread_init_callback (_jack, _thread_init_callback, this);
            jack_set_process_callback (_jack, _process_callback, this);
            jack_set_sample_rate_callback (_jack, _sample_rate_callback, this);
            jack_set_buffer_size_callback (_jack, _bufsize_callback, this);
            jack_set_xrun_callback (_jack, _xrun_callback, this);
            jack_set_sync_callback (_jack, _jack_sync_callback, this);
            jack_set_freewheel_callback (_jack, _freewheel_callback, this);

            if (Config->get_jack_time_master()) {
                  jack_set_timebase_callback (_jack, 0, _jack_timebase_callback, this);
            }

            if (jack_activate (_jack) == 0) {
                  _running = true;
                  _has_run = true;
                  Running(); /* EMIT SIGNAL */
            } else {
                  error << _("cannot activate JACK client") << endmsg;
            }
      }

      return _running ? 0 : -1;
}

int
AudioEngine::stop ()
{
      if (_running) {
            _running = false;
            jack_deactivate (_jack);
            Stopped(); /* EMIT SIGNAL */
      }

      return _running ? -1 : 0;
}


void
AudioEngine::_jack_timebase_callback (jack_transport_state_t state, jack_nframes_t nframes,

                                                        jack_position_t* pos, int new_position, void *arg)
{
      static_cast<AudioEngine*> (arg)->jack_timebase_callback (state, nframes, pos, new_position);
}

void
AudioEngine::jack_timebase_callback (jack_transport_state_t state, jack_nframes_t nframes,

                                                       jack_position_t* pos, int new_position)
{
      if (session && session->synced_to_jack()) {
            session->jack_timebase_callback (state, nframes, pos, new_position);
      }
}

int
AudioEngine::_jack_sync_callback (jack_transport_state_t state, jack_position_t* pos, void* arg)
{
      return static_cast<AudioEngine*> (arg)->jack_sync_callback (state, pos);
}

int
AudioEngine::jack_sync_callback (jack_transport_state_t state, jack_position_t* pos)
{
      if (session) {
            return session->jack_sync_callback (state, pos);
      } else {
            return true;
      }
}

int
AudioEngine::_xrun_callback (void *arg)
{
       static_cast<AudioEngine *>(arg)->Xrun (); /* EMIT SIGNAL */
      return 0;
}

int
AudioEngine::_graph_order_callback (void *arg)
{
       static_cast<AudioEngine *>(arg)->GraphReordered (); /* EMIT SIGNAL */
      return 0;
}

int
AudioEngine::_process_callback (jack_nframes_t nframes, void *arg)
{
      return static_cast<AudioEngine *> (arg)->process_callback (nframes);
}

void
AudioEngine::_freewheel_callback (int onoff, void *arg)
{
      static_cast<AudioEngine*>(arg)->_freewheeling = onoff;
}

void 
AudioEngine::meter (Port *port, jack_nframes_t nframes)
{
      double peak;
      uint32_t overlen;
      jack_default_audio_sample_t *buf;
      
      buf = port->get_buffer (nframes);
      peak = port->_peak;
      overlen = port->overlen;
      
      {
            for (jack_nframes_t n = 0; n < nframes; ++n) {
                  
                  /* 1) peak metering */
                  
                  peak = f_max (peak, buf[n]);
                  
                  /* 2) clip/over metering */
                  
                  if (buf[n] >= 1.0) {
                        overlen++;
                  } else if (overlen) {
                        if (overlen > Port::short_over_length) {
                              port->_short_overs++;
                        }
                        if (overlen > Port::long_over_length) {
                              port->_long_overs++;
                        }
                        overlen = 0;
                  }
            }
      }
      
        /* post-loop check on the final status of overlen */
      
      if (overlen > Port::short_over_length) {
            port->_short_overs++;
      }
      if (overlen > Port::long_over_length) {
            port->_short_overs++;
      }

      if (peak > 0.0) {
            port->_peak_db= 20 * fast_log10 (peak);
      } else {
            port->_peak_db = minus_infinity();
      }
      
      port->_peak = peak;
      port->overlen = overlen;
}

int
AudioEngine::process_callback (jack_nframes_t nframes)
{
      TentativeLockMonitor tm (_process_lock, __LINE__, __FILE__);
      jack_nframes_t next_processed_frames;

      /* handle wrap around of total frames counter */

      if (max_frames - _processed_frames < nframes) {
            next_processed_frames = nframes - (max_frames - _processed_frames);
      } else {
            next_processed_frames = _processed_frames + nframes;
      }
      
      if (!tm.locked() || session == 0) {
            _processed_frames = next_processed_frames;
            return 0;
      }

      if (session_remove_pending) {
            session = 0;
            session_remove_pending = false;
            pthread_cond_signal (&session_removed);
            _processed_frames = next_processed_frames;
            return 0;
      }

      if (_freewheeling) {
            if (Freewheel (nframes)) {
                  _freewheeling = false;
                  jack_set_freewheel (_jack, false);
            }
            return 0;
      }

      /* do input peak metering */

      for (Ports::iterator i = ports.begin(); i != ports.end(); ++i) {
            if ((*i)->metering) {
                  meter ((*i), nframes);
            }
      }
      
      session->process (nframes);

      if (!_running) {
            /* we were zombified, maybe because a ladspa plugin took
               too long, or jackd exited, or something like that.
            */
            
            _processed_frames = next_processed_frames;
            return 0;
      }
            
      if (last_monitor_check + monitor_check_interval < next_processed_frames) {
            for (Ports::iterator i = ports.begin(); i != ports.end(); ++i) {
                  
                  Port *port = (*i);
                  bool x;
                  
                  if (port->last_monitor != (x = port->monitoring_input ())) {
                        port->last_monitor = x;
                        /* XXX I think this is dangerous, due to 
                           a likely mutex in the signal handlers ...
                        */
                         port->MonitorInputChanged (x); /* EMIT SIGNAL */
                  }
            }
            last_monitor_check = next_processed_frames;
      }

      _processed_frames = next_processed_frames;
      return 0;
}

int
AudioEngine::_sample_rate_callback (jack_nframes_t nframes, void *arg)
{
      return static_cast<AudioEngine *> (arg)->jack_sample_rate_callback (nframes);
}

int
AudioEngine::jack_sample_rate_callback (jack_nframes_t nframes)
{
      _frame_rate = nframes;
      _usecs_per_cycle = (int) floor ((((double) frames_per_cycle() / nframes)) * 1000000.0);
      
      /* check for monitor input change every 1/10th of second */

      monitor_check_interval = nframes / 10;
      last_monitor_check = 0;

      if (session) {
            session->set_frame_rate (nframes);
      }

      SampleRateChanged (nframes); /* EMIT SIGNAL */

      return 0;
}

int
AudioEngine::_bufsize_callback (jack_nframes_t nframes, void *arg)
{
      return static_cast<AudioEngine *> (arg)->jack_bufsize_callback (nframes);
}

int
AudioEngine::jack_bufsize_callback (jack_nframes_t nframes)
{
      _buffer_size = nframes;
      _usecs_per_cycle = (int) floor ((((double) nframes / frame_rate())) * 1000000.0);
      last_monitor_check = 0;

      for (Ports::iterator i = ports.begin(); i != ports.end(); ++i) {
            (*i)->reset();
      }

      if (session) {
            session->set_block_size (_buffer_size);
      }

      return 0;
}

void 
AudioEngine::set_session (Session *s)
{
      if (!session) {
            s->set_block_size (jack_get_buffer_size (_jack));
            s->set_frame_rate (jack_get_sample_rate (_jack));
            session = s;
      }
}

void 
AudioEngine::remove_session ()
{
      LockMonitor lm (_process_lock, __LINE__, __FILE__);

      if (_running) {

            if (session) {
                  session_remove_pending = true;
                  pthread_cond_wait (&session_removed, _process_lock.mutex());
            } 

      } else {

            session = 0;

      }
      
      remove_all_ports ();

}

Port *
AudioEngine::register_audio_input_port (const string& portname)
{
      if (!_running) {
            if (!_has_run) {
                  fatal << _("register audio input port called before engine was started") << endmsg;
                  /*NOTREACHED*/
            } else {
                  return 0;
            }
      }

      jack_port_t *p = jack_port_register (_jack, portname.c_str(), JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0);

      if (p) {

            Port *newport;
            if ((newport = new Port (p)) != 0) {
                  ports.insert (ports.begin(), newport);
            }
            return newport;

      } else {

            pthread_mutex_unlock (_process_lock.mutex());
            throw PortRegistrationFailure();
      }

      return 0;
}

Port *
AudioEngine::register_audio_output_port (const string& portname)
{
      if (!_running) {
            if (!_has_run) {
                  fatal << _("register audio output port called before engine was started") << endmsg;
                  /*NOTREACHED*/
            } else {
                  return 0;
            }
      }

      jack_port_t *p;

      if ((p = jack_port_register (_jack, portname.c_str(), JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0)) != 0) {
            Port *newport = new Port (p);
            ports.insert (ports.begin(), newport);
            return newport;

      } else {

            pthread_mutex_unlock (_process_lock.mutex());
            throw PortRegistrationFailure ();
      }

      return 0;
}

int          
AudioEngine::unregister_port (Port *port)
{
      if (!_running) { 
            /* probably happening when the engine has been halted by JACK,
               in which case, there is nothing we can do here.
            */
            return 0;
      }

      if (port) {

            int ret = jack_port_unregister (_jack, port->port);
            
            if (ret == 0) {

                  for (Ports::iterator i = ports.begin(); i != ports.end(); ++i) {
                        if ((*i) == port) {
                              ports.erase (i);
                              break;
                        }
                  }

                  remove_connections_for (port);
            }

            return ret;

      } else {
            return -1;
      }
}

int 
AudioEngine::connect (const string& source, const string& destination)
{
      if (!_running) {
            if (!_has_run) {
                  fatal << _("connect called before engine was started") << endmsg;
                  /*NOTREACHED*/
            } else {
                  return -1;
            }
      }
      
      string s = make_port_name_non_relative (source);
      string d = make_port_name_non_relative (destination);

      int ret = jack_connect (_jack, s.c_str(), d.c_str());

      if (ret == 0) {
            pair<string,string> c (s, d);
            port_connections.push_back (c);
      } else {
            error << compose(_("AudioEngine: cannot connect %1 (%2) to %3 (%4)"), 
                         source, s, destination, d) 
                  << endmsg;
      }

      return ret;
}

int 
AudioEngine::disconnect (const string& source, const string& destination)
{
      if (!_running) {
            if (!_has_run) {
                  fatal << _("disconnect called before engine was started") << endmsg;
                  /*NOTREACHED*/
            } else {
                  return -1;
            }
      }
      
      string s = make_port_name_non_relative (source);
      string d = make_port_name_non_relative (destination);

      int ret = jack_disconnect (_jack, s.c_str(), d.c_str());

      if (ret == 0) {
            pair<string,string> c (s, d);
            PortConnections::iterator i;
            
            if ((i = find (port_connections.begin(), port_connections.end(), c)) != port_connections.end()) {
                  port_connections.erase (i);
            }
      }
       
      return ret;
}

int
AudioEngine::disconnect (Port *port)
{
      if (!_running) {
            if (!_has_run) {
                  fatal << _("disconnect called before engine was started") << endmsg;
                  /*NOTREACHED*/
            } else {
                  return -1;
            }
      }

      int ret = jack_port_disconnect (_jack, port->port);

      if (ret == 0) {
            remove_connections_for (port);
      }

      return ret;

}

jack_nframes_t
AudioEngine::frame_rate ()
{
      if (_jack) {
            if (_frame_rate == 0) {
                  return (_frame_rate = jack_get_sample_rate (_jack));
            } else {
                  return _frame_rate;
            }
      } else {
            fatal << X_("programming error: AudioEngine::frame_rate() called while disconnected from JACK")
                  << endmsg;
            /*NOTREACHED*/
            return 0;
      }
}

jack_nframes_t
AudioEngine::frames_per_cycle ()
{
      if (_jack) {
            if (_buffer_size == 0) {
                  return (_buffer_size = jack_get_buffer_size (_jack));
            } else {
                  return _buffer_size;
            }
      } else {
            fatal << X_("programming error: AudioEngine::frame_rate() called while disconnected from JACK")
                  << endmsg;
            /*NOTREACHED*/
            return 0;
      }
}

Port *
AudioEngine::get_port_by_name (const string& portname, bool keep)
{
      LockMonitor lm (_process_lock, __LINE__, __FILE__);

      if (!_running) {
            if (!_has_run) {
                  fatal << _("get_port_by_name() called before engine was started") << endmsg;
                  /*NOTREACHED*/
            } else {
                  return 0;
            }
      }
      
      /* check to see if we have a Port for this name already */

      for (Ports::iterator i = ports.begin(); i != ports.end(); ++i) {
            if (portname == (*i)->name()) {
                  return (*i);
            }
      }

      jack_port_t *p;

      if ((p = jack_port_by_name (_jack, portname.c_str())) != 0) {
            Port *newport = new Port (p);
            if (keep && newport->is_mine (_jack)) {
                  ports.insert (newport);
            }
            return newport;
      } else {
            return 0;
      }
}

const char **
AudioEngine::get_ports (const string& port_name_pattern, const string& type_name_pattern, uint32_t flags)
{
      if (!_running) {
            if (!_has_run) {
                  fatal << _("get_ports called before engine was started") << endmsg;
                  /*NOTREACHED*/
            } else {
                  return 0;
            }
      }
      return jack_get_ports (_jack, port_name_pattern.c_str(), type_name_pattern.c_str(), flags);
}

void
AudioEngine::halted (void *arg)
{
      AudioEngine *ae = reinterpret_cast<AudioEngine *> (arg);

      ae->_running = false;
      ae->_jack = 0;

      ae->_buffer_size = 0;
      ae->_frame_rate = 0;

      ae->Halted(); /* EMIT SIGNAL */
}

uint32_t
AudioEngine::n_physical_outputs () const
{
      const char ** ports;
      uint32_t i = 0;

      if (!_jack) {
            return 0;
      }

      if ((ports = jack_get_ports (_jack, NULL, NULL, JackPortIsPhysical|JackPortIsInput)) == 0) {
            return 0;
      }

      if (ports) {
            for (i = 0; ports[i]; ++i);
            free (ports);
      }
      return i;
}

uint32_t
AudioEngine::n_physical_inputs () const
{
      const char ** ports;
      uint32_t i = 0;
      
      if (!_jack) {
            return 0;
      }
      
      if ((ports = jack_get_ports (_jack, NULL, NULL, JackPortIsPhysical|JackPortIsOutput)) == 0) {
            return 0;
      }

      if (ports) {
            for (i = 0; ports[i]; ++i);
            free (ports);
      }
      return i;
}

string

AudioEngine::get_nth_physical (uint32_t n, int flag)
{
      const char ** ports;
      uint32_t i;
      string ret;

      if (!_running || !_jack) {
            if (!_has_run) {
                  fatal << _("get_nth_physical called before engine was started") << endmsg;
                  /*NOTREACHED*/
            } else {
                  return "";
            }
      }

      ports = jack_get_ports (_jack, NULL, NULL, JackPortIsPhysical|flag);
      
      if (ports == 0) {
            return "";
      }

      for (i = 0; i < n && ports[i]; ++i);

      if (ports[i]) {
            ret = ports[i];
      }

      free ((char *) ports);

      return ret;
}

jack_nframes_t
AudioEngine::get_port_total_latency (const Port& port)
{
      if (!_jack) {
            fatal << _("get_port_total_latency() called with no JACK client connection") << endmsg;
            /*NOTREACHED*/
      }

      if (!_running) {
            if (!_has_run) {
                  fatal << _("get_port_total_latency() called before engine was started") << endmsg;
                  /*NOTREACHED*/
            } 
      }

      return jack_port_get_total_latency (_jack, port.port);
}

void
AudioEngine::transport_stop ()
{
      // cerr << "tell JACK to stop\n";
      if (_jack) {
            jack_transport_stop (_jack);
      }
}

void
AudioEngine::transport_start ()
{
      // cerr << "tell JACK to start\n";
      if (_jack) {
            jack_transport_start (_jack);
      }
}

void
AudioEngine::transport_locate (jack_nframes_t where)
{
      // cerr << "tell JACK to locate to " << where << endl;
      if (_jack) {
            jack_transport_locate (_jack, where);
      }
}

AudioEngine::TransportState
AudioEngine::transport_state ()
{
      if (_jack) {
            jack_position_t pos;
            return (TransportState) jack_transport_query (_jack, &pos);
      } else {
            return (TransportState) JackTransportStopped;
      }
}

int
AudioEngine::reset_timebase ()
{
      if (_jack) {
            if (Config->get_jack_time_master()) {
                  return jack_set_timebase_callback (_jack, 0, _jack_timebase_callback, this);
            } else {
                  return jack_release_timebase (_jack);
            }
      } else {
            return -1;
      }
}

int
AudioEngine::freewheel (bool onoff)
{
      if (_jack) {

            if (onoff) {
                  _freewheel_thread_registered = false;
            }

            return jack_set_freewheel (_jack, onoff);

      } else {
            return -1;
      }
}

void
AudioEngine::remove_all_ports ()
{
      /* process lock MUST be held */

      if (_jack) {
            for (Ports::iterator i = ports.begin(); i != ports.end(); ++i) {
                  jack_port_unregister (_jack, (*i)->port);
            }
      }

      ports.clear ();
      port_connections.clear ();
}

void
AudioEngine::remove_connections_for (Port* port)
{
      for (PortConnections::iterator i = port_connections.begin(); i != port_connections.end(); ) {
            PortConnections::iterator tmp;
            
            tmp = i;
            ++tmp;
            
            if ((*i).first == port->name()) {
                  port_connections.erase (i);
            }

            i = tmp;
      }
}

#ifdef HAVE_JACK_CLIENT_OPEN

int
AudioEngine::connect_to_jack (string client_name)
{
      jack_options_t options = JackNullOption;
      jack_status_t status;
      const char *server_name = NULL;

      jack_client_name = client_name; /* might be reset below */

      _jack = jack_client_open (jack_client_name.c_str(), options, &status, server_name);
      
      if (_jack == NULL) {

            if (status & JackServerFailed) {
                  error << _("Unable to connect to JACK server") << endmsg;
            }
            
            error << compose (_("Could not connect to JACK server as  \"%1\""), jack_client_name) <<  endmsg;
            return -1;
      }

      if (status & JackServerStarted) {
            info << _("JACK server started") << endmsg;
      }

      if (status & JackNameNotUnique) {
            jack_client_name = jack_get_client_name (_jack);
      }
      
      return 0;
}

#else

int
AudioEngine::connect_to_jack (string client_name)
{
      jack_client_name = client_name;

      if ((_jack = jack_client_new (client_name.c_str())) == NULL) {
            return -1;
      }

      return 0;
}

#endif /* HAVE_JACK_CLIENT_OPEN */

int 
AudioEngine::disconnect_from_jack ()
{
      if (_jack == 0) {
            return 0;
      }

      if (jack_client_close (_jack)) {
            error << _("cannot shutdown connection to JACK") << endmsg;
      }

      _buffer_size = 0;
      _frame_rate = 0;

      if (_running) {
            _running = false;
            Stopped(); /* EMIT SIGNAL */
      }

      _jack = 0;
      return 0;
}

int
AudioEngine::reconnect_to_jack ()
{
      if (_jack) {
            disconnect_from_jack ();
            /* XXX give jackd a chance */
            usleep (250000);
      }

      if (connect_to_jack (jack_client_name)) {
            error << _("failed to connect to JACK") << endmsg;
            return -1;
      }

      Ports::iterator i;

      for (i = ports.begin(); i != ports.end(); ++i) {

            /* XXX hack hack hack */

            string long_name = (*i)->name();
            string short_name;
            
            short_name = long_name.substr (long_name.find_last_of (':') + 1);

            if (((*i)->port = jack_port_register (_jack, short_name.c_str(), (*i)->type(), (*i)->flags(), 0)) == 0) {
                  error << compose (_("could not reregister %1"), (*i)->name()) << endmsg;
                  break;
            } else {
            }

            (*i)->reset ();

            if ((*i)->flags() & JackPortIsOutput) {
                  (*i)->silence (jack_get_buffer_size (_jack), 0);
            }
      }

      if (i != ports.end()) {
            for (Ports::iterator i = ports.begin(); i != ports.end(); ++i) {
                  jack_port_unregister (_jack, (*i)->port);
            }
            return -1;
      } 


      if (session) {
            jack_nframes_t blocksize = jack_get_buffer_size (_jack);
            session->set_block_size (blocksize);
            session->set_frame_rate (jack_get_sample_rate (_jack));
      }

      last_monitor_check = 0;
      
      jack_on_shutdown (_jack, halted, this);
      jack_set_graph_order_callback (_jack, _graph_order_callback, this);
      jack_set_thread_init_callback (_jack, _thread_init_callback, this);
      jack_set_process_callback (_jack, _process_callback, this);
      jack_set_sample_rate_callback (_jack, _sample_rate_callback, this);
      jack_set_buffer_size_callback (_jack, _bufsize_callback, this);
      jack_set_xrun_callback (_jack, _xrun_callback, this);
      jack_set_sync_callback (_jack, _jack_sync_callback, this);
      jack_set_freewheel_callback (_jack, _freewheel_callback, this);
      
      if (Config->get_jack_time_master()) {
            jack_set_timebase_callback (_jack, 0, _jack_timebase_callback, this);
      }
      
      if (jack_activate (_jack) == 0) {
            _running = true;
            _has_run = true;
      } else {
            return -1;
      }

      /* re-establish connections */
      
      for (PortConnections::iterator i = port_connections.begin(); i != port_connections.end(); ++i) {
            
            int err;
            
            if ((err = jack_connect (_jack, (*i).first.c_str(), (*i).second.c_str())) != 0) {
                  if (err != EEXIST) {
                        error << compose (_("could not reconnect %1 and %2 (err = %3)"),
                                      (*i).first, (*i).second, err)
                              << endmsg;
                  }
            }
      }

      Running (); /* EMIT SIGNAL*/

      return 0;
}

int
AudioEngine::request_buffer_size (jack_nframes_t nframes)
{
      if (_jack) {
            int ret = jack_set_buffer_size (_jack, nframes);
            return ret;
      } else {
            return -1;
      }
}

void
AudioEngine::update_total_latencies ()
{
#ifdef HAVE_JACK_RECOMPUTE_LATENCIES
      jack_recompute_total_latencies (_jack);
#endif
}
            
string
AudioEngine::make_port_name_relative (string portname)
{
      string::size_type len;
      string::size_type n;
      
      len = portname.length();

      for (n = 0; n < len; ++n) {
            if (portname[n] == ':') {
                  break;
            }
      }
      
      if ((n != len) && (portname.substr (0, n) == jack_client_name)) {
            return portname.substr (n+1);
      }

      return portname;
}

string
AudioEngine::make_port_name_non_relative (string portname)
{
      string str;

      if (portname.find_first_of (':') != string::npos) {
            return portname;
      }

      str  = jack_client_name;
      str += ':';
      str += portname;
      
      return str;
}


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