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route.cc

/*
    Copyright (C) 2000 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.

*/

#include <cmath>
#include <fstream>
#include <cassert>

#include <sigc++/bind.h>
#include <pbd/xml++.h>
#include <pbd/enumwriter.h>

#include <ardour/timestamps.h>
#include <ardour/buffer.h>
#include <ardour/audioengine.h>
#include <ardour/route.h>
#include <ardour/insert.h>
#include <ardour/send.h>
#include <ardour/session.h>
#include <ardour/utils.h>
#include <ardour/configuration.h>
#include <ardour/cycle_timer.h>
#include <ardour/route_group.h>
#include <ardour/port.h>
#include <ardour/ladspa_plugin.h>
#include <ardour/panner.h>
#include <ardour/dB.h>
#include <ardour/mix.h>

#include "i18n.h"

using namespace std;
using namespace ARDOUR;
using namespace PBD;

uint32_t Route::order_key_cnt = 0;


Route::Route (Session& sess, string name, int input_min, int input_max, int output_min, int output_max, Flag flg, DataType default_type)
      : IO (sess, name, input_min, input_max, output_min, output_max, default_type),
        _flags (flg),
        _solo_control (X_("solo"), *this, ToggleControllable::SoloControl),
        _mute_control (X_("mute"), *this, ToggleControllable::MuteControl)
{
      init ();
}

Route::Route (Session& sess, const XMLNode& node, DataType default_type)
      : IO (sess, *node.child ("IO"), default_type),
        _solo_control (X_("solo"), *this, ToggleControllable::SoloControl),
        _mute_control (X_("mute"), *this, ToggleControllable::MuteControl)
{
      init ();
      _set_state (node, false);
}

void
Route::init ()
{
      redirect_max_outs = 0;
      _muted = false;
      _soloed = false;
      _solo_safe = false;
      _phase_invert = false;
      _denormal_protection = false;
      order_keys[strdup (N_("signal"))] = order_key_cnt++;
      _active = true;
      _silent = false;
      _meter_point = MeterPostFader;
      _initial_delay = 0;
      _roll_delay = 0;
      _own_latency = 0;
      _have_internal_generator = false;
      _declickable = false;
      _pending_declick = true;
      _remote_control_id = 0;
      _ignore_gain_on_deliver = true;
      
      _edit_group = 0;
      _mix_group = 0;

      _mute_affects_pre_fader = Config->get_mute_affects_pre_fader();
      _mute_affects_post_fader = Config->get_mute_affects_post_fader();
      _mute_affects_control_outs = Config->get_mute_affects_control_outs();
      _mute_affects_main_outs = Config->get_mute_affects_main_outs();
      
      solo_gain = 1.0;
      desired_solo_gain = 1.0;
      mute_gain = 1.0;
      desired_mute_gain = 1.0;

      _control_outs = 0;

      input_changed.connect (mem_fun (this, &Route::input_change_handler));
      output_changed.connect (mem_fun (this, &Route::output_change_handler));
}

Route::~Route ()
{
      clear_redirects (PreFader, this);
      clear_redirects (PostFader, this);

      for (OrderKeys::iterator i = order_keys.begin(); i != order_keys.end(); ++i) {
            free ((void*)(i->first));
      }

      if (_control_outs) {
            delete _control_outs;
      }
}

void
Route::set_remote_control_id (uint32_t id)
{
      if (id != _remote_control_id) {
            _remote_control_id = id;
            RemoteControlIDChanged ();
      }
}

uint32_t
Route::remote_control_id() const
{
      return _remote_control_id;
}

long
Route::order_key (const char* name) const
{
      OrderKeys::const_iterator i;
      
      for (i = order_keys.begin(); i != order_keys.end(); ++i) {
            if (!strcmp (name, i->first)) {
                  return i->second;
            }
      }

      return -1;
}

void
Route::set_order_key (const char* name, long n)
{
      order_keys[strdup(name)] = n;
      _session.set_dirty ();
}

void
Route::inc_gain (gain_t fraction, void *src)
{
      IO::inc_gain (fraction, src);
}

void
Route::set_gain (gain_t val, void *src)
{
      if (src != 0 && _mix_group && src != _mix_group && _mix_group->is_active()) {
            
            if (_mix_group->is_relative()) {
                  
                  
                  gain_t usable_gain  = gain();
                  if (usable_gain < 0.000001f) {
                        usable_gain=0.000001f;
                  }
                                    
                  gain_t delta = val;
                  if (delta < 0.000001f) {
                        delta=0.000001f;
                  }

                  delta -= usable_gain;

                  if (delta == 0.0f) return;

                  gain_t factor = delta / usable_gain;

                  if (factor > 0.0f) {
                        factor = _mix_group->get_max_factor(factor);
                        if (factor == 0.0f) {
                              gain_changed (src);
                              return;
                        }
                  } else {
                        factor = _mix_group->get_min_factor(factor);
                        if (factor == 0.0f) {
                              gain_changed (src);
                              return;
                        }
                  }
                              
                  _mix_group->apply (&Route::inc_gain, factor, _mix_group);

            } else {
                  
                  _mix_group->apply (&Route::set_gain, val, _mix_group);
            }

            return;
      } 

      if (val == gain()) {
            return;
      }

      IO::set_gain (val, src);
}

void
Route::process_output_buffers (vector<Sample*>& bufs, uint32_t nbufs,
                         nframes_t start_frame, nframes_t end_frame, 
                         nframes_t nframes, nframes_t offset, bool with_redirects, int declick,
                         bool meter)
{
      uint32_t n;
      RedirectList::iterator i;
      bool post_fader_work = false;
      bool mute_declick_applied = false;
      gain_t dmg, dsg, dg;
      vector<Sample*>::iterator bufiter;
      IO *co;
      bool mute_audible;
      bool solo_audible;
      bool no_monitor;
      gain_t* gab = _session.gain_automation_buffer();

      switch (Config->get_monitoring_model()) {
      case HardwareMonitoring:
      case ExternalMonitoring:
            no_monitor = true;
            break;
      default:
            no_monitor = false;
      }

      declick = _pending_declick;

      {
            Glib::Mutex::Lock cm (control_outs_lock, Glib::TRY_LOCK);
            
            if (cm.locked()) {
                  co = _control_outs;
            } else {
                  co = 0;
            }
      }
      
      { 
            Glib::Mutex::Lock dm (declick_lock, Glib::TRY_LOCK);
            
            if (dm.locked()) {
                  dmg = desired_mute_gain;
                  dsg = desired_solo_gain;
                  dg = _desired_gain;
            } else {
                  dmg = mute_gain;
                  dsg = solo_gain;
                  dg = _gain;
            }
      }

      /* ----------------------------------------------------------------------------------------------------
         GLOBAL DECLICK (for transport changes etc.)
         -------------------------------------------------------------------------------------------------- */

      if (declick > 0) {
            apply_declick (bufs, nbufs, nframes, 0.0, 1.0, false);
            _pending_declick = 0;
      } else if (declick < 0) {
            apply_declick (bufs, nbufs, nframes, 1.0, 0.0, false);
            _pending_declick = 0;
      } else {

            /* no global declick */

            if (solo_gain != dsg) {
                  apply_declick (bufs, nbufs, nframes, solo_gain, dsg, false);
                  solo_gain = dsg;
            }
      }


      /* ----------------------------------------------------------------------------------------------------
         INPUT METERING & MONITORING
         -------------------------------------------------------------------------------------------------- */

      if (meter && (_meter_point == MeterInput)) {
            for (n = 0; n < nbufs; ++n) {
                  _peak_power[n] = Session::compute_peak (bufs[n], nframes, _peak_power[n]); 
            }
      }

      if (!_soloed && _mute_affects_pre_fader && (mute_gain != dmg)) {
            apply_declick (bufs, nbufs, nframes, mute_gain, dmg, false);
            mute_gain = dmg;
            mute_declick_applied = true;
      }

      if ((_meter_point == MeterInput) && co) {
            
            solo_audible = dsg > 0;
            mute_audible = dmg > 0;// || !_mute_affects_pre_fader;
            
            if (    // muted by solo of another track
                  
                  !solo_audible || 
                  
                  // muted by mute of this track 
                  
                  !mute_audible ||
                  
                  // rec-enabled but not s/w monitoring 
                  
                  // TODO: this is probably wrong

                  (no_monitor && record_enabled() && (!Config->get_auto_input() || _session.actively_recording()))

                  ) {
                  
                  co->silence (nframes, offset);
                  
            } else {

                  co->deliver_output (bufs, nbufs, nframes, offset);
                  
            } 
      } 

      /* -----------------------------------------------------------------------------------------------------
         DENORMAL CONTROL
         -------------------------------------------------------------------------------------------------- */

      if (_denormal_protection || Config->get_denormal_protection()) {

            for (n = 0; n < nbufs; ++n)  {
                  Sample *sp = bufs[n];
                  
                  for (nframes_t nx = offset; nx < nframes + offset; ++nx) {
                        sp[nx] += 1.0e-27f;
                  }
            }
      }


      /* ----------------------------------------------------------------------------------------------------
         PRE-FADER REDIRECTS
         -------------------------------------------------------------------------------------------------- */

      if (with_redirects) {
            Glib::RWLock::ReaderLock rm (redirect_lock, Glib::TRY_LOCK);
            if (rm.locked()) {
                  if (mute_gain > 0 || !_mute_affects_pre_fader) {
                        for (i = _redirects.begin(); i != _redirects.end(); ++i) {
                              switch ((*i)->placement()) {
                              case PreFader:
                                    if (dsg == 0) {
                                          if (boost::dynamic_pointer_cast<Send>(*i) || boost::dynamic_pointer_cast<PortInsert>(*i)) {
                                                (*i)->silence (nframes, offset);
                                          }
                                    } else {
                                          (*i)->run (bufs, nbufs, nframes, offset);
                                    }
                                    break;
                              case PostFader:
                                    post_fader_work = true;
                                    break;
                              }
                        }
                  } else {
                        for (i = _redirects.begin(); i != _redirects.end(); ++i) {
                              switch ((*i)->placement()) {
                              case PreFader:
                                    (*i)->silence (nframes, offset);
                                    break;
                              case PostFader:
                                    post_fader_work = true;
                                    break;
                              }
                        }
                  }
            } 
      }


      if (!_soloed && (mute_gain != dmg) && !mute_declick_applied && _mute_affects_post_fader) {
            apply_declick (bufs, nbufs, nframes, mute_gain, dmg, false);
            mute_gain = dmg;
            mute_declick_applied = true;
      }

      /* ----------------------------------------------------------------------------------------------------
         PRE-FADER METERING & MONITORING
         -------------------------------------------------------------------------------------------------- */

      if (meter && (_meter_point == MeterPreFader)) {
            for (n = 0; n < nbufs; ++n) {
                  _peak_power[n] = Session::compute_peak (bufs[n], nframes, _peak_power[n]);
            }
      }

      
      if ((_meter_point == MeterPreFader) && co) {
            
            solo_audible = dsg > 0;
            mute_audible = dmg > 0 || !_mute_affects_pre_fader;
            
            if ( // muted by solo of another track
                  
                  !solo_audible || 
                  
                  // muted by mute of this track 
                  
                  !mute_audible ||
                  
                  // rec-enabled but not s/w monitoring 
                  
                  (no_monitor && record_enabled() && (!Config->get_auto_input() || _session.actively_recording()))

                  ) {
                  
                  co->silence (nframes, offset);
                  
            } else {

                  co->deliver_output_no_pan (bufs, nbufs, nframes, offset);
                  
            } 
      } 
      
      /* ----------------------------------------------------------------------------------------------------
         GAIN STAGE
         -------------------------------------------------------------------------------------------------- */

      /* if not recording or recording and requiring any monitor signal, then apply gain */

      if ( // not recording 

            !(record_enabled() && _session.actively_recording()) || 
            
          // OR recording 
            
            // h/w monitoring not in use 
            
            (!Config->get_monitoring_model() == HardwareMonitoring && 

             // AND software monitoring required

             Config->get_monitoring_model() == SoftwareMonitoring)) { 
            
            if (apply_gain_automation) {
                  
                  if (_phase_invert) {
                        for (n = 0; n < nbufs; ++n)  {
                              Sample *sp = bufs[n];
                              
                              for (nframes_t nx = 0; nx < nframes; ++nx) {
                                    sp[nx] *= -gab[nx];
                              }
                        }
                  } else {
                        for (n = 0; n < nbufs; ++n) {
                              Sample *sp = bufs[n];
                              
                              for (nframes_t nx = 0; nx < nframes; ++nx) {
                                    sp[nx] *= gab[nx];
                              }
                        }
                  }
                  
                  if (apply_gain_automation && _session.transport_rolling() && nframes > 0) {
                        _effective_gain = gab[nframes-1];
                  }
                  
            } else {
                  
                  /* manual (scalar) gain */
                  
                  if (_gain != dg) {
                        
                        apply_declick (bufs, nbufs, nframes, _gain, dg, _phase_invert);
                        _gain = dg;
                        
                  } else if (_gain != 0 && (_phase_invert || _gain != 1.0)) {
                        
                        /* no need to interpolate current gain value,
                           but its non-unity, so apply it. if the gain
                           is zero, do nothing because we'll ship silence
                           below.
                        */

                        gain_t this_gain;
                        
                        if (_phase_invert) {
                              this_gain = -_gain;
                        } else {
                              this_gain = _gain;
                        }
                        
                        for (n = 0; n < nbufs; ++n) {
                              Sample *sp = bufs[n];
                              Session::apply_gain_to_buffer(sp,nframes,this_gain);
                        }

                  } else if (_gain == 0) {
                        for (n = 0; n < nbufs; ++n) {
                              memset (bufs[n], 0, sizeof (Sample) * nframes);
                        }
                  }
            }

      } else {

            /* actively recording, no monitoring required; leave buffers as-is to save CPU cycles */

      }

      /* ----------------------------------------------------------------------------------------------------
         POST-FADER REDIRECTS
         -------------------------------------------------------------------------------------------------- */

      /* note that post_fader_work cannot be true unless with_redirects was also true, so don't test both */

      if (post_fader_work) {

            Glib::RWLock::ReaderLock rm (redirect_lock, Glib::TRY_LOCK);
            if (rm.locked()) {
                  if (mute_gain > 0 || !_mute_affects_post_fader) {
                        for (i = _redirects.begin(); i != _redirects.end(); ++i) {
                              switch ((*i)->placement()) {
                              case PreFader:
                                    break;
                              case PostFader:
                                    if (dsg == 0) {
                                          if (boost::dynamic_pointer_cast<Send>(*i) || boost::dynamic_pointer_cast<PortInsert>(*i)) {
                                                (*i)->silence (nframes, offset);
                                          }
                                    } else {
                                          (*i)->run (bufs, nbufs, nframes, offset);
                                    }
                                    break;
                              }
                        }
                  } else {
                        for (i = _redirects.begin(); i != _redirects.end(); ++i) {
                              switch ((*i)->placement()) {
                              case PreFader:
                                    break;
                              case PostFader:
                                    (*i)->silence (nframes, offset);
                                    break;
                              }
                        }
                  }
            } 
      }

      if (!_soloed && (mute_gain != dmg) && !mute_declick_applied && _mute_affects_control_outs) {
            apply_declick (bufs, nbufs, nframes, mute_gain, dmg, false);
            mute_gain = dmg;
            mute_declick_applied = true;
      }

      /* ----------------------------------------------------------------------------------------------------
         CONTROL OUTPUT STAGE
         -------------------------------------------------------------------------------------------------- */

      if ((_meter_point == MeterPostFader) && co) {
            
            solo_audible = solo_gain > 0;
            mute_audible = dmg > 0 || !_mute_affects_control_outs;

            if ( // silent anyway

                  (_gain == 0 && !apply_gain_automation) || 
                
                     // muted by solo of another track

                  !solo_audible || 
                
                     // muted by mute of this track 

                  !mute_audible ||

                // recording but not s/w monitoring 
                  
                  (no_monitor && record_enabled() && (!Config->get_auto_input() || _session.actively_recording()))

                  ) {
                  
                  co->silence (nframes, offset);
                  
            } else {

                  co->deliver_output_no_pan (bufs, nbufs, nframes, offset);
            } 
      } 

      /* ----------------------------------------------------------------------
         GLOBAL MUTE 
         ----------------------------------------------------------------------*/

      if (!_soloed && (mute_gain != dmg) && !mute_declick_applied && _mute_affects_main_outs) {
            apply_declick (bufs, nbufs, nframes, mute_gain, dmg, false);
            mute_gain = dmg;
            mute_declick_applied = true;
      }
      
      /* ----------------------------------------------------------------------------------------------------
         MAIN OUTPUT STAGE
         -------------------------------------------------------------------------------------------------- */

      solo_audible = dsg > 0;
      mute_audible = dmg > 0 || !_mute_affects_main_outs;
      
      if (n_outputs() == 0) {
          
          /* relax */

      } else if (no_monitor && record_enabled() && (!Config->get_auto_input() || _session.actively_recording())) {
            
            IO::silence (nframes, offset);
            
      } else {

            if ( // silent anyway

                (_gain == 0 && !apply_gain_automation) ||
                
                // muted by solo of another track, but not using control outs for solo

                (!solo_audible && (Config->get_solo_model() != SoloBus)) ||
                
                // muted by mute of this track

                !mute_audible

                  ) {

                  /* don't use Route::silence() here, because that causes
                     all outputs (sends, port inserts, etc. to be silent).
                  */
                  
                  if (_meter_point == MeterPostFader) {
                        reset_peak_meters ();
                  }

                  IO::silence (nframes, offset);
                  
            } else {
                  
                  if ((_session.transport_speed() > 1.5f || 
                       _session.transport_speed() < -1.5f) &&
                      Config->get_quieten_at_speed()) {
                        pan (bufs, nbufs, nframes, offset, speed_quietning); 
                  } else {
                        // cerr << _name << " panner state = " << _panner->automation_state() << endl;
                        if (!_panner->empty() &&
                            (_panner->automation_state() & Play ||
                             ((_panner->automation_state() & Touch) && !_panner->touching()))) {
                              pan_automated (bufs, nbufs, start_frame, end_frame, nframes, offset);
                        } else {
                              pan (bufs, nbufs, nframes, offset, 1.0); 
                        }
                  }
            }

      }

      /* ----------------------------------------------------------------------------------------------------
         POST-FADER METERING
         -------------------------------------------------------------------------------------------------- */

      if (meter && (_meter_point == MeterPostFader)) {
//          cerr << "meter post" << endl;

            if ((_gain == 0 && !apply_gain_automation) || dmg == 0) {
                  uint32_t no = n_outputs();
                  for (n = 0; n < no; ++n) {
                        _peak_power[n] = 0;
                  } 
            } else {
                  uint32_t no = n_outputs();
                  for (n = 0; n < no; ++n) {
                        _peak_power[n] = Session::compute_peak (output(n)->get_buffer (nframes) + offset, nframes, _peak_power[n]);
                  }
            }
      }
}

uint32_t
Route::n_process_buffers ()
{
      return max (n_inputs(), redirect_max_outs);
}

void

Route::passthru (nframes_t start_frame, nframes_t end_frame, nframes_t nframes, nframes_t offset, int declick, bool meter_first)
{
      vector<Sample*>& bufs = _session.get_passthru_buffers();
      uint32_t limit = n_process_buffers ();

      _silent = false;

      collect_input (bufs, limit, nframes, offset);

#define meter_stream meter_first

      if (meter_first) {
            for (uint32_t n = 0; n < limit; ++n) {
                  _peak_power[n] = Session::compute_peak (bufs[n], nframes, _peak_power[n]);
            }
            meter_stream = false;
      } else {
            meter_stream = true;
      }
            
      process_output_buffers (bufs, limit, start_frame, end_frame, nframes, offset, true, declick, meter_stream);

#undef meter_stream
}

void
Route::set_phase_invert (bool yn, void *src)
{
      if (_phase_invert != yn) {
            _phase_invert = yn;
            //  phase_invert_changed (src); /* EMIT SIGNAL */
      }
}

void
Route::set_denormal_protection (bool yn, void *src)
{
      if (_denormal_protection != yn) {
            _denormal_protection = yn;
            //  denormal_protection_changed (src); /* EMIT SIGNAL */
      }
}

void
Route::set_solo (bool yn, void *src)
{
      if (_solo_safe) {
            return;
      }

      if (_mix_group && src != _mix_group && _mix_group->is_active()) {
            _mix_group->apply (&Route::set_solo, yn, _mix_group);
            return;
      }

      if (_soloed != yn) {
            _soloed = yn;
            solo_changed (src); /* EMIT SIGNAL */
            _solo_control.Changed (); /* EMIT SIGNAL */
      }
}

void
Route::set_solo_mute (bool yn)
{
      Glib::Mutex::Lock lm (declick_lock);

      /* Called by Session in response to another Route being soloed.
       */
         
      desired_solo_gain = (yn?0.0:1.0);
}

void
Route::set_solo_safe (bool yn, void *src)
{
      if (_solo_safe != yn) {
            _solo_safe = yn;
             solo_safe_changed (src); /* EMIT SIGNAL */
      }
}

void
Route::set_mute (bool yn, void *src)

{
      if (_mix_group && src != _mix_group && _mix_group->is_active()) {
            _mix_group->apply (&Route::set_mute, yn, _mix_group);
            return;
      }

      if (_muted != yn) {
            _muted = yn;
            mute_changed (src); /* EMIT SIGNAL */
            
            _mute_control.Changed (); /* EMIT SIGNAL */
            
            Glib::Mutex::Lock lm (declick_lock);
            desired_mute_gain = (yn?0.0f:1.0f);
      }
}

int
Route::add_redirect (boost::shared_ptr<Redirect> redirect, void *src, uint32_t* err_streams)
{
      uint32_t old_rmo = redirect_max_outs;

      if (!_session.engine().connected()) {
            return 1;
      }

      {
            Glib::RWLock::WriterLock lm (redirect_lock);

            boost::shared_ptr<PluginInsert> pi;
            boost::shared_ptr<PortInsert> porti;

            uint32_t potential_max_streams = 0;

            if ((pi = boost::dynamic_pointer_cast<PluginInsert>(redirect)) != 0) {
                  pi->set_count (1);

                  if (pi->input_streams() == 0) {
                        /* instrument plugin */
                        _have_internal_generator = true;
                  }

                  potential_max_streams = max(pi->input_streams(), pi->output_streams());
                  
            } else if ((porti = boost::dynamic_pointer_cast<PortInsert>(redirect)) != 0) {

                  /* force new port inserts to start out with an i/o configuration
                     that matches this route's i/o configuration.

                     the "inputs" for the port are supposed to match the output
                     of this route.

                     the "outputs" of the route should match the inputs of this
                     route. XXX shouldn't they match the number of active signal
                     streams at the point of insertion?
                     
                  */

                  porti->ensure_io (n_outputs (), n_inputs(), false, this);
            }

            // Ensure peak vector sizes before the plugin is activated
            while (_peak_power.size() < potential_max_streams) {
                  _peak_power.push_back(0);
            }
            while (_visible_peak_power.size() < potential_max_streams) {
                  _visible_peak_power.push_back(-INFINITY);
            }
            while (_max_peak_power.size() < potential_max_streams) {
                  _max_peak_power.push_back(-INFINITY);
            }

            _redirects.push_back (redirect);

            if (_reset_plugin_counts (err_streams)) {
                  _redirects.pop_back ();
                  _reset_plugin_counts (0); // it worked before we tried to add it ...
                  return -1;
            }

            redirect->activate ();
            redirect->active_changed.connect (mem_fun (*this, &Route::redirect_active_proxy));
      }
      
      if (redirect_max_outs != old_rmo || old_rmo == 0) {
            reset_panner ();
      }


      redirects_changed (src); /* EMIT SIGNAL */
      return 0;
}

int
Route::add_redirects (const RedirectList& others, void *src, uint32_t* err_streams)
{
      uint32_t old_rmo = redirect_max_outs;

      assert (ports_legal);

      if (!_session.engine().connected()) {
            return 1;
      }

      {
            Glib::RWLock::WriterLock lm (redirect_lock);

            RedirectList::iterator existing_end = _redirects.end();
            --existing_end;

            uint32_t potential_max_streams = 0;

            for (RedirectList::const_iterator i = others.begin(); i != others.end(); ++i) {
                  
                  boost::shared_ptr<PluginInsert> pi;
                  
                  if ((pi = boost::dynamic_pointer_cast<PluginInsert>(*i)) != 0) {
                        pi->set_count (1);
                        
                        uint32_t m = max(pi->input_streams(), pi->output_streams());
                        if (m > potential_max_streams)
                              potential_max_streams = m;
                  }

                  // Ensure peak vector sizes before the plugin is activated
                  while (_peak_power.size() < potential_max_streams) {
                        _peak_power.push_back(0);
                  }
                  while (_visible_peak_power.size() < potential_max_streams) {
                        _visible_peak_power.push_back(-INFINITY);
                  }
                  while (_max_peak_power.size() < potential_max_streams) {
                        _max_peak_power.push_back(-INFINITY);
                  }

                  _redirects.push_back (*i);
                  
                  if (_reset_plugin_counts (err_streams)) {
                        ++existing_end;
                        _redirects.erase (existing_end, _redirects.end());
                        _reset_plugin_counts (0); // it worked before we tried to add it ...
                        return -1;
                  }
                  
                  (*i)->activate ();
                  (*i)->active_changed.connect (mem_fun (*this, &Route::redirect_active_proxy));
            }
      }
      
      if (redirect_max_outs != old_rmo || old_rmo == 0) {
            reset_panner ();
      }

      redirects_changed (src); /* EMIT SIGNAL */
      return 0;
}

/** Remove redirects with a given placement.
 * @param p Placement of redirects to remove.
 */
void
Route::clear_redirects (Placement p, void *src)
{
      const uint32_t old_rmo = redirect_max_outs;

      if (!_session.engine().connected()) {
            return;
      }

      {
            Glib::RWLock::WriterLock lm (redirect_lock);
            RedirectList new_list;
            
            for (RedirectList::iterator i = _redirects.begin(); i != _redirects.end(); ++i) {
                  if ((*i)->placement() == p) {
                        /* it's the placement we want to get rid of */
                        (*i)->drop_references ();
                  } else {
                        /* it's a different placement, so keep it */
                        new_list.push_back (*i);
                  }
            }
            
            _redirects = new_list;
      }

      /* FIXME: can't see how this test can ever fire */
      if (redirect_max_outs != old_rmo) {
            reset_panner ();
      }
      
      redirect_max_outs = 0;
      _have_internal_generator = false;
      redirects_changed (src); /* EMIT SIGNAL */
}

int
Route::remove_redirect (boost::shared_ptr<Redirect> redirect, void *src, uint32_t* err_streams)
{
      uint32_t old_rmo = redirect_max_outs;

      assert (ports_legal);

      if (!_session.engine().connected()) {
            return 1;
      }

      redirect_max_outs = 0;

      {
            Glib::RWLock::WriterLock lm (redirect_lock);
            RedirectList::iterator i;
            bool removed = false;

            for (i = _redirects.begin(); i != _redirects.end(); ++i) {
                  if (*i == redirect) {

                        RedirectList::iterator tmp;

                        /* move along, see failure case for reset_plugin_counts()
                           where we may need to reinsert the redirect.
                        */

                        tmp = i;
                        ++tmp;

                        /* stop redirects that send signals to JACK ports
                           from causing noise as a result of no longer being
                           run.
                        */

                        boost::shared_ptr<Send> send;
                        boost::shared_ptr<PortInsert> port_insert;
                        
                        if ((send = boost::dynamic_pointer_cast<Send> (*i)) != 0) {
                              send->disconnect_inputs (this);
                              send->disconnect_outputs (this);
                        } else if ((port_insert = boost::dynamic_pointer_cast<PortInsert> (*i)) != 0) {
                              port_insert->disconnect_inputs (this);
                              port_insert->disconnect_outputs (this);
                        }

                        _redirects.erase (i);

                        i = tmp;
                        removed = true;
                        break;
                  }
            }

            if (!removed) {
                  /* what? */
                  return 1;
            }

            if (_reset_plugin_counts (err_streams)) {
                  /* get back to where we where */
                  _redirects.insert (i, redirect);
                  /* we know this will work, because it worked before :) */
                  _reset_plugin_counts (0);
                  return -1;
            }

            bool foo = false;

            for (i = _redirects.begin(); i != _redirects.end(); ++i) {
                  boost::shared_ptr<PluginInsert> pi;
                  
                  if ((pi = boost::dynamic_pointer_cast<PluginInsert>(*i)) != 0) {
                        if (pi->is_generator()) {
                              foo = true;
                        }
                  }
            }

            _have_internal_generator = foo;
      }

      if (old_rmo != redirect_max_outs) {
            reset_panner ();
      }

      redirect->drop_references ();

      redirects_changed (src); /* EMIT SIGNAL */
      return 0;
}

int
Route::reset_plugin_counts (uint32_t* lpc)
{
      Glib::RWLock::WriterLock lm (redirect_lock);
      return _reset_plugin_counts (lpc);
}


int
Route::_reset_plugin_counts (uint32_t* err_streams)
{
      RedirectList::iterator r;
      uint32_t i_cnt;
      uint32_t s_cnt;
      map<Placement,list<InsertCount> > insert_map;
      nframes_t initial_streams;

      redirect_max_outs = 0;
      i_cnt = 0;
      s_cnt = 0;

      /* divide inserts up by placement so we get the signal flow
         properly modelled. we need to do this because the _redirects
         list is not sorted by placement, and because other reasons may 
         exist now or in the future for this separate treatment.
      */
      
      for (r = _redirects.begin(); r != _redirects.end(); ++r) {

            boost::shared_ptr<Insert> insert;

            /* do this here in case we bomb out before we get to the end of
               this function.
            */

            redirect_max_outs = max ((*r)->output_streams (), redirect_max_outs);

            if ((insert = boost::dynamic_pointer_cast<Insert>(*r)) != 0) {
                  ++i_cnt;
                  insert_map[insert->placement()].push_back (InsertCount (insert));

                  /* reset plugin counts back to one for now so
                     that we have a predictable, controlled
                     state to try to configure.
                  */

                  boost::shared_ptr<PluginInsert> pi;
            
                  if ((pi = boost::dynamic_pointer_cast<PluginInsert>(insert)) != 0) {
                        pi->set_count (1);
                  }

            } else if (boost::dynamic_pointer_cast<Send> (*r) != 0) {
                  ++s_cnt;
            }
      }
      
      if (i_cnt == 0) {
            if (s_cnt) {
                  goto recompute;
            } else {
                  return 0;
            }
      }

      /* Now process each placement in order, checking to see if we 
         can really do what has been requested.
      */

      /* A: PreFader */
      
      if (check_some_plugin_counts (insert_map[PreFader], n_inputs (), err_streams)) {
            return -1;
      }

      /* figure out the streams that will feed into PreFader */

      if (!insert_map[PreFader].empty()) {
            InsertCount& ic (insert_map[PreFader].back());
            initial_streams = ic.insert->compute_output_streams (ic.cnt);
      } else {
            initial_streams = n_inputs ();
      }

      /* B: PostFader */

      if (check_some_plugin_counts (insert_map[PostFader], initial_streams, err_streams)) {
            return -1;
      }

      /* OK, everything can be set up correctly, so lets do it */

      apply_some_plugin_counts (insert_map[PreFader]);
      apply_some_plugin_counts (insert_map[PostFader]);

      /* recompute max outs of any redirect */

  recompute:

      redirect_max_outs = 0;
      RedirectList::iterator prev = _redirects.end();

      for (r = _redirects.begin(); r != _redirects.end(); prev = r, ++r) {
            boost::shared_ptr<Send> s;

            if ((s = boost::dynamic_pointer_cast<Send> (*r)) != 0) {
                  if (r == _redirects.begin()) {
                        s->expect_inputs (n_inputs());
                  } else {
                        s->expect_inputs ((*prev)->output_streams());
                  }

            } else {
                  
                  /* don't pay any attention to send output configuration, since it doesn't
                     affect the route.
                   */

                  redirect_max_outs = max ((*r)->output_streams (), redirect_max_outs);
                  
            }
      }

      /* we're done */

      return 0;
}                          

int32_t
Route::apply_some_plugin_counts (list<InsertCount>& iclist)
{
      list<InsertCount>::iterator i;

      for (i = iclist.begin(); i != iclist.end(); ++i) {
            
            if ((*i).insert->configure_io ((*i).cnt, (*i).in, (*i).out)) {
                  return -1;
            }
            /* make sure that however many we have, they are all active */
            (*i).insert->activate ();
      }

      return 0;
}

int32_t
Route::check_some_plugin_counts (list<InsertCount>& iclist, int32_t required_inputs, uint32_t* err_streams)
{
      list<InsertCount>::iterator i;
      
      for (i = iclist.begin(); i != iclist.end(); ++i) {

            if (((*i).cnt = (*i).insert->can_support_input_configuration (required_inputs)) < 0) {
                  if (err_streams) {
                        *err_streams = required_inputs;
                  }
                  return -1;
            }
            
            (*i).in = required_inputs;
            (*i).out = (*i).insert->compute_output_streams ((*i).cnt);

            required_inputs = (*i).out;
      }

      return 0;
}

int
Route::copy_redirects (const Route& other, Placement placement, uint32_t* err_streams)
{
      uint32_t old_rmo = redirect_max_outs;

      if (err_streams) {
            *err_streams = 0;
      }

      RedirectList to_be_deleted;

      {
            Glib::RWLock::WriterLock lm (redirect_lock);
            RedirectList::iterator tmp;
            RedirectList the_copy;

            the_copy = _redirects;
            
            /* remove all relevant redirects */

            for (RedirectList::iterator i = _redirects.begin(); i != _redirects.end(); ) {
                  tmp = i;
                  ++tmp;

                  if ((*i)->placement() == placement) {
                        to_be_deleted.push_back (*i);
                        _redirects.erase (i);
                  }

                  i = tmp;
            }

            /* now copy the relevant ones from "other" */
            
            for (RedirectList::const_iterator i = other._redirects.begin(); i != other._redirects.end(); ++i) {
                  if ((*i)->placement() == placement) {
                        _redirects.push_back (Redirect::clone (*i));
                  }
            }

            /* reset plugin stream handling */

            if (_reset_plugin_counts (err_streams)) {

                  /* FAILED COPY ATTEMPT: we have to restore order */

                  /* delete all cloned redirects */

                  for (RedirectList::iterator i = _redirects.begin(); i != _redirects.end(); ) {

                        tmp = i;
                        ++tmp;

                        if ((*i)->placement() == placement) {
                              _redirects.erase (i);
                        }
                        
                        i = tmp;
                  }

                  /* restore the natural order */

                  _redirects = the_copy;
                  redirect_max_outs = old_rmo;

                  /* we failed, even though things are OK again */

                  return -1;

            } else {
                  
                  /* SUCCESSFUL COPY ATTEMPT: delete the redirects we removed pre-copy */
                  to_be_deleted.clear ();
            }
      }

      if (redirect_max_outs != old_rmo || old_rmo == 0) {
            reset_panner ();
      }

      redirects_changed (this); /* EMIT SIGNAL */
      return 0;
}

void
Route::all_redirects_flip ()
{
      Glib::RWLock::ReaderLock lm (redirect_lock);

      if (_redirects.empty()) {
            return;
      }

      bool first_is_on = _redirects.front()->active();
      
      for (RedirectList::iterator i = _redirects.begin(); i != _redirects.end(); ++i) {
            (*i)->set_active (!first_is_on, this);
      }
}

/** Set all redirects with a given placement to a given active state.
 * @param p Placement of redirects to change.
 * @param state New active state for those redirects.
 */
void
Route::all_redirects_active (Placement p, bool state)
{
      Glib::RWLock::ReaderLock lm (redirect_lock);

      if (_redirects.empty()) {
            return;
      }

      for (RedirectList::iterator i = _redirects.begin(); i != _redirects.end(); ++i) {
            if ((*i)->placement() == p) {
                  (*i)->set_active (state, this);
            }
      }
}

struct RedirectSorter {
    bool operator() (boost::shared_ptr<const Redirect> a, boost::shared_ptr<const Redirect> b) {
          return a->sort_key() < b->sort_key();
    }
};

int
Route::sort_redirects (uint32_t* err_streams)
{
      {
            RedirectSorter comparator;
            Glib::RWLock::WriterLock lm (redirect_lock);
            uint32_t old_rmo = redirect_max_outs;

            /* the sweet power of C++ ... */

            RedirectList as_it_was_before = _redirects;

            _redirects.sort (comparator);
      
            if (_reset_plugin_counts (err_streams)) {
                  _redirects = as_it_was_before;
                  redirect_max_outs = old_rmo;
                  return -1;
            } 
      } 

      reset_panner ();
      redirects_changed (this); /* EMIT SIGNAL */

      return 0;
}

XMLNode&
Route::get_state()
{
      return state(true);
}

XMLNode&
Route::get_template()
{
      return state(false);
}

XMLNode&
Route::state(bool full_state)
{
      XMLNode *node = new XMLNode("Route");
      RedirectList:: iterator i;
      char buf[32];

      if (_flags) {
            node->add_property("flags", enum_2_string (_flags));
      }
      
      node->add_property("default-type", _default_type.to_string());

      node->add_property("active", _active?"yes":"no");
      node->add_property("muted", _muted?"yes":"no");
      node->add_property("soloed", _soloed?"yes":"no");
      node->add_property("phase-invert", _phase_invert?"yes":"no");
      node->add_property("denormal-protection", _denormal_protection?"yes":"no");
      node->add_property("mute-affects-pre-fader", _mute_affects_pre_fader?"yes":"no"); 
      node->add_property("mute-affects-post-fader", _mute_affects_post_fader?"yes":"no"); 
      node->add_property("mute-affects-control-outs", _mute_affects_control_outs?"yes":"no"); 
      node->add_property("mute-affects-main-outs", _mute_affects_main_outs?"yes":"no"); 

      if (_edit_group) {
            node->add_property("edit-group", _edit_group->name());
      }
      if (_mix_group) {
            node->add_property("mix-group", _mix_group->name());
      }

      string order_string;
      OrderKeys::iterator x = order_keys.begin(); 

      while (x != order_keys.end()) {
            order_string += string ((*x).first);
            order_string += '=';
            snprintf (buf, sizeof(buf), "%ld", (*x).second);
            order_string += buf;
            
            ++x;

            if (x == order_keys.end()) {
                  break;
            }

            order_string += ':';
      }
      node->add_property ("order-keys", order_string);

      node->add_child_nocopy (IO::state (full_state));
      node->add_child_nocopy (_solo_control.get_state ());
      node->add_child_nocopy (_mute_control.get_state ());

      XMLNode* remote_control_node = new XMLNode (X_("remote_control"));
      snprintf (buf, sizeof (buf), "%d", _remote_control_id);
      remote_control_node->add_property (X_("id"), buf);
      node->add_child_nocopy (*remote_control_node);

      if (_control_outs) {
            XMLNode* cnode = new XMLNode (X_("ControlOuts"));
            cnode->add_child_nocopy (_control_outs->state (full_state));
            node->add_child_nocopy (*cnode);
      }

      if (_comment.length()) {
            XMLNode *cmt = node->add_child ("Comment");
            cmt->add_content (_comment);
      }

      for (i = _redirects.begin(); i != _redirects.end(); ++i) {
            node->add_child_nocopy((*i)->state (full_state));
      }

      if (_extra_xml){
            node->add_child_copy (*_extra_xml);
      }
      
      return *node;
}

void
Route::set_deferred_state ()
{
      XMLNodeList nlist;
      XMLNodeConstIterator niter;

      if (!deferred_state) {
            return;
      }

      nlist = deferred_state->children();

      for (niter = nlist.begin(); niter != nlist.end(); ++niter){
            add_redirect_from_xml (**niter);
      }

      delete deferred_state;
      deferred_state = 0;
}

void
Route::add_redirect_from_xml (const XMLNode& node)
{
      const XMLProperty *prop;

      if (node.name() == "Send") {
            

            try {
                  boost::shared_ptr<Send> send (new Send (_session, node));
                  add_redirect (send, this);
            } 
            
            catch (failed_constructor &err) {
                  error << _("Send construction failed") << endmsg;
                  return;
            }
            
      } else if (node.name() == "Insert") {
            
            try {
                  if ((prop = node.property ("type")) != 0) {

                        boost::shared_ptr<Insert> insert;

                        if (prop->value() == "ladspa" || prop->value() == "Ladspa" || prop->value() == "vst") {

                              insert.reset (new PluginInsert(_session, node));
                              
                        } else if (prop->value() == "port") {


                              insert.reset (new PortInsert (_session, node));

                        } else {

                              error << string_compose(_("unknown Insert type \"%1\"; ignored"), prop->value()) << endmsg;
                        }

                        add_redirect (insert, this);
                        
                  } else {
                        error << _("Insert XML node has no type property") << endmsg;
                  }
            }
            
            catch (failed_constructor &err) {
                  warning << _("insert could not be created. Ignored.") << endmsg;
                  return;
            }
      }
}

int
Route::set_state (const XMLNode& node)
{
      return _set_state (node, true);
}

int
Route::_set_state (const XMLNode& node, bool call_base)
{
      XMLNodeList nlist;
      XMLNodeConstIterator niter;
      XMLNode *child;
      XMLPropertyList plist;
      const XMLProperty *prop;

      if (node.name() != "Route"){
            error << string_compose(_("Bad node sent to Route::set_state() [%1]"), node.name()) << endmsg;
            return -1;
      }

      if ((prop = node.property (X_("flags"))) != 0) {
            _flags = Flag (string_2_enum (prop->value(), _flags));
      } else {
            _flags = Flag (0);
      }
      
      if ((prop = node.property (X_("default-type"))) != 0) {
            _default_type = DataType(prop->value());
            assert(_default_type != DataType::NIL);
      }

      if ((prop = node.property (X_("phase-invert"))) != 0) {
            set_phase_invert (prop->value()=="yes"?true:false, this);
      }

      if ((prop = node.property (X_("denormal-protection"))) != 0) {
            set_denormal_protection (prop->value()=="yes"?true:false, this);
      }

      if ((prop = node.property (X_("active"))) != 0) {
            set_active (prop->value() == "yes");
      }

      if ((prop = node.property (X_("muted"))) != 0) {
            bool yn = prop->value()=="yes"?true:false; 

            /* force reset of mute status */

            _muted = !yn;
            set_mute(yn, this);
            mute_gain = desired_mute_gain;
      }

      if ((prop = node.property (X_("soloed"))) != 0) {
            bool yn = prop->value()=="yes"?true:false; 

            /* force reset of solo status */

            _soloed = !yn;
            set_solo (yn, this);
            solo_gain = desired_solo_gain;
      }

      if ((prop = node.property (X_("mute-affects-pre-fader"))) != 0) {
            _mute_affects_pre_fader = (prop->value()=="yes")?true:false;
      }

      if ((prop = node.property (X_("mute-affects-post-fader"))) != 0) {
            _mute_affects_post_fader = (prop->value()=="yes")?true:false;
      }

      if ((prop = node.property (X_("mute-affects-control-outs"))) != 0) {
            _mute_affects_control_outs = (prop->value()=="yes")?true:false;
      }

      if ((prop = node.property (X_("mute-affects-main-outs"))) != 0) {
            _mute_affects_main_outs = (prop->value()=="yes")?true:false;
      }

      if ((prop = node.property (X_("edit-group"))) != 0) {
            RouteGroup* edit_group = _session.edit_group_by_name(prop->value());
            if(edit_group == 0) {
                  error << string_compose(_("Route %1: unknown edit group \"%2 in saved state (ignored)"), _name, prop->value()) << endmsg;
            } else {
                  set_edit_group(edit_group, this);
            }
      }

      if ((prop = node.property (X_("order-keys"))) != 0) {

            long n;

            string::size_type colon, equal;
            string remaining = prop->value();

            while (remaining.length()) {

                  if ((equal = remaining.find_first_of ('=')) == string::npos || equal == remaining.length()) {
                        error << string_compose (_("badly formed order key string in state file! [%1] ... ignored."), remaining)
                              << endmsg;
                  } else {
                        if (sscanf (remaining.substr (equal+1).c_str(), "%ld", &n) != 1) {
                              error << string_compose (_("badly formed order key string in state file! [%1] ... ignored."), remaining)
                                    << endmsg;
                        } else {
                              set_order_key (remaining.substr (0, equal).c_str(), n);
                        }
                  }

                  colon = remaining.find_first_of (':');

                  if (colon != string::npos) {
                        remaining = remaining.substr (colon+1);
                  } else {
                        break;
                  }
            }
      }

      nlist = node.children();

      if (deferred_state) {
            delete deferred_state;
      }

      deferred_state = new XMLNode(X_("deferred state"));

      /* set parent class properties before anything else */

      for (niter = nlist.begin(); niter != nlist.end(); ++niter){

            child = *niter;

            if (child->name() == IO::state_node_name && call_base) {

                  IO::set_state (*child);
                  break;
            }
      }


      XMLNodeList redirect_nodes;
      
      for (niter = nlist.begin(); niter != nlist.end(); ++niter){
            
            child = *niter;
            
            if (child->name() == X_("Send") || child->name() == X_("Insert")) {
                  redirect_nodes.push_back(child);
            }
            
      }
      
      _set_redirect_states (redirect_nodes);

      for (niter = nlist.begin(); niter != nlist.end(); ++niter){
            child = *niter;
            // All redirects (sends and inserts) have been applied already

            if (child->name() == X_("Automation")) {
                  
                  if ((prop = child->property (X_("path"))) != 0)  {
                        load_automation (prop->value());
                  }

            } else if (child->name() == X_("ControlOuts")) {
                  
                  string coutname = _name;
                  coutname += _("[control]");

                  _control_outs = new IO (_session, coutname);
                  _control_outs->set_state (**(child->children().begin()));

            } else if (child->name() == X_("Comment")) {

                  /* XXX this is a terrible API design in libxml++ */

                  XMLNode *cmt = *(child->children().begin());
                  _comment = cmt->content();

            } else if (child->name() == X_("extra")) {

                  _extra_xml = new XMLNode (*child);

            } else if (child->name() == X_("controllable") && (prop = child->property("name")) != 0) {
                  
                  if (prop->value() == "solo") {
                        _solo_control.set_state (*child);
                        _session.add_controllable (&_solo_control);
                  }
                  else if (prop->value() == "mute") {
                        _mute_control.set_state (*child);
                        _session.add_controllable (&_mute_control);
                  }
            }
            else if (child->name() == X_("remote_control")) {
                  if ((prop = child->property (X_("id"))) != 0) {
                        int32_t x;
                        sscanf (prop->value().c_str(), "%d", &x);
                        set_remote_control_id (x);
                  }
            }
      }

      if ((prop = node.property (X_("mix-group"))) != 0) {
            RouteGroup* mix_group = _session.mix_group_by_name(prop->value());
            if (mix_group == 0) {
                  error << string_compose(_("Route %1: unknown mix group \"%2 in saved state (ignored)"), _name, prop->value()) << endmsg;
            }  else {
                  set_mix_group(mix_group, this);
            }
      }

      return 0;
}

void
Route::_set_redirect_states(const XMLNodeList &nlist)
{
      XMLNodeConstIterator niter;
      char buf[64];

      RedirectList::iterator i, o;

      if (!ports_legal) {

            for (niter = nlist.begin(); niter != nlist.end(); ++niter) {
                  deferred_state->add_child_copy (**niter);
            }

            return;
      }

      // Iterate through existing redirects, remove those which are not in the state list
      for (i = _redirects.begin(); i != _redirects.end(); ) {
            RedirectList::iterator tmp = i;
            ++tmp;

            bool redirectInStateList = false;

            (*i)->id().print (buf, sizeof (buf));

            for (niter = nlist.begin(); niter != nlist.end(); ++niter) {

                  if (strncmp (buf,(*niter)->child(X_("Redirect"))->child(X_("IO"))->property(X_("id"))->value().c_str(), sizeof(buf)) == 0) {
                        redirectInStateList = true;
                        break;
                  }
            }
            
            if (!redirectInStateList) {
                  remove_redirect ( *i, this);
            }


            i = tmp;
      }


      // Iterate through state list and make sure all redirects are on the track and in the correct order,
      // set the state of existing redirects according to the new state on the same go
      i = _redirects.begin();
      for (niter = nlist.begin(); niter != nlist.end(); ++niter, ++i) {

            // Check whether the next redirect in the list 
            o = i;

            while (o != _redirects.end()) {
                  (*o)->id().print (buf, sizeof (buf));
                  if ( strncmp(buf, (*niter)->child(X_("Redirect"))->child(X_("IO"))->property(X_("id"))->value().c_str(), sizeof(buf)) == 0)
                        break;
                  ++o;
            }

            if (o == _redirects.end()) {
                  // If the redirect (*niter) is not on the route, we need to create it
                  // and move it to the correct location

                  RedirectList::iterator prev_last = _redirects.end();
                  --prev_last; // We need this to check whether adding succeeded
                  
                  add_redirect_from_xml (**niter);

                  RedirectList::iterator last = _redirects.end();
                  --last;

                  if (prev_last == last) {
                        warning << _name << ": could not fully restore state as some redirects were not possible to create" << endmsg;
                        continue;

                  }

                  boost::shared_ptr<Redirect> tmp = (*last);
                  // remove the redirect from the wrong location
                  _redirects.erase(last);
                  // insert the new redirect at the current location
                  _redirects.insert(i, tmp);

                  --i; // move pointer to the newly inserted redirect
                  continue;
            }

            // We found the redirect (*niter) on the route, first we must make sure the redirect
            // is at the location provided in the XML state
            if (i != o) {
                  boost::shared_ptr<Redirect> tmp = (*o);
                  // remove the old copy
                  _redirects.erase(o);
                  // insert the redirect at the correct location
                  _redirects.insert(i, tmp);

                  --i; // move pointer so it points to the right redirect
            }

            (*i)->set_state( (**niter) );
      }
      
      redirects_changed(this);
}

void
Route::curve_reallocate ()
{
//    _gain_automation_curve.finish_resize ();
//    _pan_automation_curve.finish_resize ();
}

void
Route::silence (nframes_t nframes, nframes_t offset)
{
      if (!_silent) {

            // reset_peak_meters ();
            
            IO::silence (nframes, offset);

            if (_control_outs) {
                  _control_outs->silence (nframes, offset);
            }

            { 
                  Glib::RWLock::ReaderLock lm (redirect_lock, Glib::TRY_LOCK);
                  
                  if (lm.locked()) {
                        for (RedirectList::iterator i = _redirects.begin(); i != _redirects.end(); ++i) {
                              boost::shared_ptr<PluginInsert> pi;
                              if (!_active && (pi = boost::dynamic_pointer_cast<PluginInsert> (*i)) != 0) {
                                    // skip plugins, they don't need anything when we're not active
                                    continue;
                              }

                              (*i)->silence (nframes, offset);
                        }

                        if (nframes == _session.get_block_size() && offset == 0) {
                              // _silent = true;
                        }
                  }
            }
            
      }
}     

int
Route::set_control_outs (const vector<string>& ports)
{
      Glib::Mutex::Lock lm (control_outs_lock);
      vector<string>::const_iterator i;
      uint32_t limit;

      if (_control_outs) {
            delete _control_outs;
            _control_outs = 0;
      }

      if (control() || master()) {
            /* no control outs for these two special busses */
            return 0;
      }
      
      if (ports.empty()) {
            return 0;
      }
 
      string coutname = _name;
      coutname += _("[control]");
      
      _control_outs = new IO (_session, coutname);

      /* our control outs need as many outputs as we
         have outputs. we track the changes in ::output_change_handler().
      */

      limit = n_outputs ();

      if (_control_outs->ensure_io (0, limit, true, this)) {
            return -1;
      }

      /* now connect to the named ports */

      for (uint32_t n = 0; n < limit; ++n) {
            if (_control_outs->connect_output (_control_outs->output (n), ports[n], this)) {
                  error << string_compose (_("could not connect %1 to %2"), _control_outs->output(n)->name(), ports[n]) << endmsg;
                  return -1;
            }
      }
 
      return 0;
}     

void
Route::set_edit_group (RouteGroup *eg, void *src)

{
      if (eg == _edit_group) {
            return;
      }

      if (_edit_group) {
            _edit_group->remove (this);
      }

      if ((_edit_group = eg) != 0) {
            _edit_group->add (this);
      }

      _session.set_dirty ();
      edit_group_changed (src); /* EMIT SIGNAL */
}

void
Route::drop_edit_group (void *src)
{
      _edit_group = 0;
      _session.set_dirty ();
      edit_group_changed (src); /* EMIT SIGNAL */
}

void
Route::set_mix_group (RouteGroup *mg, void *src)

{
      if (mg == _mix_group) {
            return;
      }

      if (_mix_group) {
            _mix_group->remove (this);
      }

      if ((_mix_group = mg) != 0) {
            _mix_group->add (this);
      }

      _session.set_dirty ();
      mix_group_changed (src); /* EMIT SIGNAL */
}

void
Route::drop_mix_group (void *src)
{
      _mix_group = 0;
      _session.set_dirty ();
      mix_group_changed (src); /* EMIT SIGNAL */
}

void
Route::set_comment (string cmt, void *src)
{
      _comment = cmt;
      comment_changed (src);
      _session.set_dirty ();
}

bool
Route::feeds (boost::shared_ptr<Route> other)
{
      uint32_t i, j;

      IO& self = *this;
      uint32_t no = self.n_outputs();
      uint32_t ni = other->n_inputs ();

      for (i = 0; i < no; ++i) {
            for (j = 0; j < ni; ++j) {
                  if (self.output(i)->connected_to (other->input(j)->name())) {
                        return true;
                  }
            }
      }

      /* check Redirects which may also interconnect Routes */

      for (RedirectList::iterator r = _redirects.begin(); r != _redirects.end(); r++) {

            no = (*r)->n_outputs();

            for (i = 0; i < no; ++i) {
                  for (j = 0; j < ni; ++j) {
                        if ((*r)->output(i)->connected_to (other->input (j)->name())) {
                              return true;
                        }
                  }
            }
      }

      /* check for control room outputs which may also interconnect Routes */

      if (_control_outs) {

            no = _control_outs->n_outputs();
            
            for (i = 0; i < no; ++i) {
                  for (j = 0; j < ni; ++j) {
                        if (_control_outs->output(i)->connected_to (other->input (j)->name())) {
                              return true;
                        }
                  }
            }
      }

      return false;
}

void
Route::set_mute_config (mute_type t, bool onoff, void *src)
{
      switch (t) {
      case PRE_FADER:
            _mute_affects_pre_fader = onoff;
             pre_fader_changed(src); /* EMIT SIGNAL */
            break;

      case POST_FADER:
            _mute_affects_post_fader = onoff;
             post_fader_changed(src); /* EMIT SIGNAL */
            break;

      case CONTROL_OUTS:
            _mute_affects_control_outs = onoff;
             control_outs_changed(src); /* EMIT SIGNAL */
            break;

      case MAIN_OUTS:
            _mute_affects_main_outs = onoff;
             main_outs_changed(src); /* EMIT SIGNAL */
            break;
      }
}

bool
Route::get_mute_config (mute_type t)
{
      bool onoff = false;
      
      switch (t){
      case PRE_FADER:
            onoff = _mute_affects_pre_fader; 
            break;
      case POST_FADER:
            onoff = _mute_affects_post_fader;
            break;
      case CONTROL_OUTS:
            onoff = _mute_affects_control_outs;
            break;
      case MAIN_OUTS:
            onoff = _mute_affects_main_outs;
            break;
      }
      
      return onoff;
}

void
Route::set_active (bool yn)
{
      _active = yn; 
       active_changed(); /* EMIT SIGNAL */
}

void
Route::handle_transport_stopped (bool abort_ignored, bool did_locate, bool can_flush_redirects)
{
      nframes_t now = _session.transport_frame();

      {
            Glib::RWLock::ReaderLock lm (redirect_lock);

            if (!did_locate) {
                  automation_snapshot (now);
            }

            for (RedirectList::iterator i = _redirects.begin(); i != _redirects.end(); ++i) {
                  
                  if (Config->get_plugins_stop_with_transport() && can_flush_redirects) {
                        (*i)->deactivate ();
                        (*i)->activate ();
                  }
                  
                  (*i)->transport_stopped (now);
            }
      }

      IO::transport_stopped (now);
 
      _roll_delay = _initial_delay;
}

void
Route::input_change_handler (IOChange change, void *ignored)
{
      if (change & ConfigurationChanged) {
            reset_plugin_counts (0);
      }
}

void
Route::output_change_handler (IOChange change, void *ignored)
{
      if (change & ConfigurationChanged) {
            if (_control_outs) {
                  _control_outs->ensure_io (0, n_outputs(), true, this);
            }
            
            reset_plugin_counts (0);
      }
}

uint32_t
Route::pans_required () const
{
      if (n_outputs() < 2) {
            return 0;
      }
      
      return max (n_inputs (), redirect_max_outs);
}

int 
Route::no_roll (nframes_t nframes, nframes_t start_frame, nframes_t end_frame, nframes_t offset, 
               bool session_state_changing, bool can_record, bool rec_monitors_input)
{
      if (n_outputs() == 0) {
            return 0;
      }

      if (session_state_changing || !_active)  {
            silence (nframes, offset);
            return 0;
      }

      apply_gain_automation = false;
      
      if (n_inputs()) {
            passthru (start_frame, end_frame, nframes, offset, 0, false);
      } else {
            silence (nframes, offset);
      }

      return 0;
}

nframes_t
Route::check_initial_delay (nframes_t nframes, nframes_t& offset, nframes_t& transport_frame)
{
      if (_roll_delay > nframes) {

            _roll_delay -= nframes;
            silence (nframes, offset);
            /* transport frame is not legal for caller to use */
            return 0;

      } else if (_roll_delay > 0) {

            nframes -= _roll_delay;

            silence (_roll_delay, offset);

            offset += _roll_delay;
            transport_frame += _roll_delay;

            _roll_delay = 0;
      }

      return nframes;
}

int
Route::roll (nframes_t nframes, nframes_t start_frame, nframes_t end_frame, nframes_t offset, int declick,
           bool can_record, bool rec_monitors_input)
{
      {
            Glib::RWLock::ReaderLock lm (redirect_lock, Glib::TRY_LOCK);
            if (lm.locked()) {
                  // automation snapshot can also be called from the non-rt context
                  // and it uses the redirect list, so we take the lock out here
                  automation_snapshot (_session.transport_frame());
            }
      }

      if ((n_outputs() == 0 && _redirects.empty()) || n_inputs() == 0 || !_active) {
            silence (nframes, offset);
            return 0;
      }
      
      nframes_t unused = 0;

      if ((nframes = check_initial_delay (nframes, offset, unused)) == 0) {
            return 0;
      }

      _silent = false;

      apply_gain_automation = false;

      { 
            Glib::Mutex::Lock am (automation_lock, Glib::TRY_LOCK);
            
            if (am.locked() && _session.transport_rolling()) {
                  
                  nframes_t start_frame = end_frame - nframes;
                  
                  if (gain_automation_playback()) {
                        apply_gain_automation = _gain_automation_curve.rt_safe_get_vector (start_frame, end_frame, _session.gain_automation_buffer(), nframes);
                  }
            }
      }

      passthru (start_frame, end_frame, nframes, offset, declick, false);

      return 0;
}

int
Route::silent_roll (nframes_t nframes, nframes_t start_frame, nframes_t end_frame, nframes_t offset, 
                bool can_record, bool rec_monitors_input)
{
      silence (nframes, offset);
      return 0;
}

void
Route::toggle_monitor_input ()
{
      for (vector<Port*>::iterator i = _inputs.begin(); i != _inputs.end(); ++i) {
            (*i)->ensure_monitor_input(!(*i)->monitoring_input());
      }
}

bool
Route::has_external_redirects () const
{
      boost::shared_ptr<const PortInsert> pi;
      
      for (RedirectList::const_iterator i = _redirects.begin(); i != _redirects.end(); ++i) {
            if ((pi = boost::dynamic_pointer_cast<const PortInsert>(*i)) != 0) {

                  uint32_t no = pi->n_outputs();

                  for (uint32_t n = 0; n < no; ++n) {
                        
                        string port_name = pi->output(n)->name();
                        string client_name = port_name.substr (0, port_name.find(':'));

                        /* only say "yes" if the redirect is actually in use */
                        
                        if (client_name != "ardour" && pi->active()) {
                              return true;
                        }
                  }
            }
      }

      return false;
}

void
Route::flush_redirects ()
{
      /* XXX shouldn't really try to take this lock, since
         this is called from the RT audio thread.
      */

      Glib::RWLock::ReaderLock lm (redirect_lock);

      for (RedirectList::iterator i = _redirects.begin(); i != _redirects.end(); ++i) {
            (*i)->deactivate ();
            (*i)->activate ();
      }
}

void
Route::set_meter_point (MeterPoint p, void *src)
{
      if (_meter_point != p) {
            _meter_point = p;
             meter_change (src); /* EMIT SIGNAL */
            _session.set_dirty ();
      }
}

nframes_t
Route::update_total_latency ()
{
      _own_latency = 0;

      for (RedirectList::iterator i = _redirects.begin(); i != _redirects.end(); ++i) {
            if ((*i)->active ()) {
                  _own_latency += (*i)->latency ();
            }
      }

      set_port_latency (_own_latency);

      /* this (virtual) function is used for pure Routes,
         not derived classes like AudioTrack.  this means
         that the data processed here comes from an input
         port, not prerecorded material, and therefore we
         have to take into account any input latency.
      */

      _own_latency += input_latency ();

      return _own_latency;
}

void
Route::set_latency_delay (nframes_t longest_session_latency)
{
      _initial_delay = longest_session_latency - _own_latency;

      if (_session.transport_stopped()) {
            _roll_delay = _initial_delay;
      }
}

void
Route::automation_snapshot (nframes_t now)
{
      IO::automation_snapshot (now);

      for (RedirectList::iterator i = _redirects.begin(); i != _redirects.end(); ++i) {
            (*i)->automation_snapshot (now);
      }
}

Route::ToggleControllable::ToggleControllable (std::string name, Route& s, ToggleType tp)
      : Controllable (name), route (s), type(tp)
{
      
}

void
Route::ToggleControllable::set_value (float val)
{
      bool bval = ((val >= 0.5f) ? true: false);
      
      switch (type) {
      case MuteControl:
            route.set_mute (bval, this);
            break;
      case SoloControl:
            route.set_solo (bval, this);
            break;
      default:
            break;
      }
}

float
Route::ToggleControllable::get_value (void) const
{
      float val = 0.0f;
      
      switch (type) {
      case MuteControl:
            val = route.muted() ? 1.0f : 0.0f;
            break;
      case SoloControl:
            val = route.soloed() ? 1.0f : 0.0f;
            break;
      default:
            break;
      }

      return val;
}

void 
Route::set_block_size (nframes_t nframes)
{
      for (RedirectList::iterator i = _redirects.begin(); i != _redirects.end(); ++i) {
            (*i)->set_block_size (nframes);
      }
}

void
Route::redirect_active_proxy (Redirect* ignored, void* ignored_src)
{
      _session.update_latency_compensation (false, false);
}

void
Route::protect_automation ()
{
      switch (gain_automation_state()) {
      case Write:
            set_gain_automation_state (Off);
      case Touch:
            set_gain_automation_state (Play);
            break;
      default:
            break;
      }

      switch (panner().automation_state ()) {
      case Write:
            panner().set_automation_state (Off);
            break;
      case Touch:
            panner().set_automation_state (Play);
            break;
      default:
            break;
      }
      
      for (RedirectList::iterator i = _redirects.begin(); i != _redirects.end(); ++i) {
            boost::shared_ptr<PluginInsert> pi;
            if ((pi = boost::dynamic_pointer_cast<PluginInsert> (*i)) != 0) {
                  pi->protect_automation ();
            }
      }
}

void
Route::set_pending_declick (int declick)
{
      if (_declickable) {
            /* this call is not allowed to turn off a pending declick unless "force" is true */
            if (declick) {
                  _pending_declick = declick;
            }
            // cerr << _name << ": after setting to " << declick << " pending declick = " << _pending_declick << endl;
      } else {
            _pending_declick = 0;
      }

}

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