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audio_track.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.

*/

#include <sigc++/retype.h>
#include <sigc++/retype_return.h>
#include <sigc++/bind.h>

#include <pbd/error.h>
#include <pbd/enumwriter.h>

#include <ardour/audio_track.h>
#include <ardour/audio_diskstream.h>
#include <ardour/session.h>
#include <ardour/redirect.h>
#include <ardour/audioregion.h>
#include <ardour/audiosource.h>
#include <ardour/region_factory.h>
#include <ardour/route_group_specialized.h>
#include <ardour/insert.h>
#include <ardour/audioplaylist.h>
#include <ardour/playlist_factory.h>
#include <ardour/panner.h>
#include <ardour/utils.h>

#include "i18n.h"

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

AudioTrack::AudioTrack (Session& sess, string name, Route::Flag flag, TrackMode mode)
      : Track (sess, name, flag, mode)
{
      AudioDiskstream::Flag dflags = AudioDiskstream::Flag (0);

      if (_flags & Hidden) {
            dflags = AudioDiskstream::Flag (dflags | AudioDiskstream::Hidden);
      } else {
            dflags = AudioDiskstream::Flag (dflags | AudioDiskstream::Recordable);
      }

      if (mode == Destructive) {
            dflags = AudioDiskstream::Flag (dflags | AudioDiskstream::Destructive);
      }

      boost::shared_ptr<AudioDiskstream> ds (new AudioDiskstream (_session, name, dflags));
      
      _session.add_diskstream (ds);

      set_diskstream (boost::dynamic_pointer_cast<AudioDiskstream> (ds), this);
}

AudioTrack::AudioTrack (Session& sess, const XMLNode& node)
      : Track (sess, node)
{
      _set_state (node, false);
}

AudioTrack::~AudioTrack ()
{
}

int
AudioTrack::set_mode (TrackMode m)
{
      if (m != _mode) {

            if (_diskstream->set_destructive (m == Destructive)) {
                  return -1;
            }

            _mode = m;
            
            TrackModeChanged (); /* EMIT SIGNAL */
      }

      return 0;
}

bool
AudioTrack::can_use_mode (TrackMode m, bool& bounce_required)
{
      switch (m) {
      case Normal:
            bounce_required = false;
            return true;
            
      case Destructive:
      default:
            return _diskstream->can_become_destructive (bounce_required);
      }
}

int
AudioTrack::deprecated_use_diskstream_connections ()
{
      boost::shared_ptr<AudioDiskstream> diskstream = audio_diskstream();

      if (diskstream->deprecated_io_node == 0) {
            return 0;
      }

      const XMLProperty* prop;
      XMLNode& node (*diskstream->deprecated_io_node);

      /* don't do this more than once. */

      diskstream->deprecated_io_node = 0;

      set_input_minimum (-1);
      set_input_maximum (-1);
      set_output_minimum (-1);
      set_output_maximum (-1);
      
      if ((prop = node.property ("gain")) != 0) {
            set_gain (atof (prop->value().c_str()), this);
            _gain = _desired_gain;
      }

      if ((prop = node.property ("input-connection")) != 0) {
            Connection* c = _session.connection_by_name (prop->value());
            
            if (c == 0) {
                  error << string_compose(_("Unknown connection \"%1\" listed for input of %2"), prop->value(), _name) << endmsg;

                  string replacement_connection;

                  if (prop->value().find ('+') != string::npos) {
                        replacement_connection = _("in 1+2");
                  } else {
                        replacement_connection = _("in 1");
                  }
                  
                  if ((c = _session.connection_by_name (replacement_connection)) == 0) {
                        error << _("No input connections available as a replacement")
                          << endmsg;
                        return -1;
                  } else {
                        info << string_compose (_("Connection %1 was not available - \"%2\" used instead"), prop->value(), replacement_connection)
                             << endmsg;
                  }
            }

            use_input_connection (*c, this);

      } else if ((prop = node.property ("inputs")) != 0) {
            if (set_inputs (prop->value())) {
                  error << string_compose(_("improper input channel list in XML node (%1)"), prop->value()) << endmsg;
                  return -1;
            }
      }
      
      return 0;
}

int
AudioTrack::set_diskstream (boost::shared_ptr<AudioDiskstream> ds, void *src)
{
      _diskstream = ds;
      _diskstream->set_io (*this);
      _diskstream->set_destructive (_mode == Destructive);

      if (audio_diskstream()->deprecated_io_node) {

            if (!connecting_legal) {
                  ConnectingLegal.connect (mem_fun (*this, &AudioTrack::deprecated_use_diskstream_connections));
            } else {
                  deprecated_use_diskstream_connections ();
            }
      }

      _diskstream->set_record_enabled (false);
      _diskstream->monitor_input (false);

      ic_connection.disconnect();
      ic_connection = input_changed.connect (mem_fun (*_diskstream, &Diskstream::handle_input_change));

      DiskstreamChanged (); /* EMIT SIGNAL */

      return 0;
}     

int 
AudioTrack::use_diskstream (string name)
{
      boost::shared_ptr<AudioDiskstream> dstream;

      if ((dstream = boost::dynamic_pointer_cast<AudioDiskstream>(_session.diskstream_by_name (name))) == 0) {
            error << string_compose(_("AudioTrack: audio diskstream \"%1\" not known by session"), name) << endmsg;
            return -1;
      }
      
      return set_diskstream (dstream, this);
}

int 
AudioTrack::use_diskstream (const PBD::ID& id)
{
      boost::shared_ptr<AudioDiskstream> dstream;

      if ((dstream = boost::dynamic_pointer_cast<AudioDiskstream> (_session.diskstream_by_id (id))) == 0) {
            error << string_compose(_("AudioTrack: audio diskstream \"%1\" not known by session"), id) << endmsg;
            return -1;
      }
      
      return set_diskstream (dstream, this);
}

boost::shared_ptr<AudioDiskstream>
AudioTrack::audio_diskstream() const
{
      return boost::dynamic_pointer_cast<AudioDiskstream>(_diskstream);
}

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

int
AudioTrack::_set_state (const XMLNode& node, bool call_base)
{
      const XMLProperty *prop;
      XMLNodeConstIterator iter;

      if (call_base) {
            if (Route::_set_state (node, call_base)) {
                  return -1;
            }
      }

      if ((prop = node.property (X_("mode"))) != 0) {
            _mode = TrackMode (string_2_enum (prop->value(), _mode));
      } else {
            _mode = Normal;
      }

      if ((prop = node.property ("diskstream-id")) == 0) {
            
            /* some old sessions use the diskstream name rather than the ID */

            if ((prop = node.property ("diskstream")) == 0) {
                  fatal << _("programming error: AudioTrack given state without diskstream!") << endmsg;
                  /*NOTREACHED*/
                  return -1;
            }

            if (use_diskstream (prop->value())) {
                  return -1;
            }

      } else {
            
            PBD::ID id (prop->value());
            
            if (use_diskstream (id)) {
                  return -1;
            }
      }


      XMLNodeList nlist;
      XMLNodeConstIterator niter;
      XMLNode *child;

      nlist = node.children();
      for (niter = nlist.begin(); niter != nlist.end(); ++niter){
            child = *niter;

            if (child->name() == X_("recenable")) {
                  _rec_enable_control.set_state (*child);
                  _session.add_controllable (&_rec_enable_control);
            }
      }

      pending_state = const_cast<XMLNode*> (&node);

      _session.StateReady.connect (mem_fun (*this, &AudioTrack::set_state_part_two));

      return 0;
}

XMLNode& 
AudioTrack::state(bool full_state)
{
      XMLNode& root (Route::state(full_state));
      XMLNode* freeze_node;
      char buf[64];

      if (_freeze_record.playlist) {
            XMLNode* inode;

            freeze_node = new XMLNode (X_("freeze-info"));
            freeze_node->add_property ("playlist", _freeze_record.playlist->name());
            freeze_node->add_property ("state", enum_2_string (_freeze_record.state));

            for (vector<FreezeRecordInsertInfo*>::iterator i = _freeze_record.insert_info.begin(); i != _freeze_record.insert_info.end(); ++i) {
                  inode = new XMLNode (X_("insert"));
                  (*i)->id.print (buf, sizeof (buf));
                  inode->add_property (X_("id"), buf);
                  inode->add_child_copy ((*i)->state);
            
                  freeze_node->add_child_nocopy (*inode);
            }

            root.add_child_nocopy (*freeze_node);
      }

      /* Alignment: act as a proxy for the diskstream */
      
      XMLNode* align_node = new XMLNode (X_("alignment"));
      AlignStyle as = _diskstream->alignment_style ();
      align_node->add_property (X_("style"), enum_2_string (as));
      root.add_child_nocopy (*align_node);

      root.add_property (X_("mode"), enum_2_string (_mode));

      /* we don't return diskstream state because we don't
         own the diskstream exclusively. control of the diskstream
         state is ceded to the Session, even if we create the
         diskstream.
      */

      _diskstream->id().print (buf, sizeof (buf));
      root.add_property ("diskstream-id", buf);

      root.add_child_nocopy (_rec_enable_control.get_state());

      return root;
}

void
AudioTrack::set_state_part_two ()
{
      XMLNode* fnode;
      XMLProperty* prop;
      LocaleGuard lg (X_("POSIX"));

      /* This is called after all session state has been restored but before
         have been made ports and connections are established.
      */

      if (pending_state == 0) {
            return;
      }

      if ((fnode = find_named_node (*pending_state, X_("freeze-info"))) != 0) {

            
            _freeze_record.have_mementos = false;
            _freeze_record.state = Frozen;
            
            for (vector<FreezeRecordInsertInfo*>::iterator i = _freeze_record.insert_info.begin(); i != _freeze_record.insert_info.end(); ++i) {
                  delete *i;
            }
            _freeze_record.insert_info.clear ();
            
            if ((prop = fnode->property (X_("playlist"))) != 0) {
                  boost::shared_ptr<Playlist> pl = _session.playlist_by_name (prop->value());
                  if (pl) {
                        _freeze_record.playlist = boost::dynamic_pointer_cast<AudioPlaylist> (pl);
                  } else {
                        _freeze_record.playlist.reset ();
                        _freeze_record.state = NoFreeze;
                  return;
                  }
            }
            
            if ((prop = fnode->property (X_("state"))) != 0) {
                  _freeze_record.state = FreezeState (string_2_enum (prop->value(), _freeze_record.state));
            }
            
            XMLNodeConstIterator citer;
            XMLNodeList clist = fnode->children();
            
            for (citer = clist.begin(); citer != clist.end(); ++citer) {
                  if ((*citer)->name() != X_("insert")) {
                        continue;
                  }
                  
                  if ((prop = (*citer)->property (X_("id"))) == 0) {
                        continue;
                  }
                  
                  FreezeRecordInsertInfo* frii = new FreezeRecordInsertInfo (*((*citer)->children().front()),
                                                               boost::shared_ptr<Insert>());
                  frii->id = prop->value ();
                  _freeze_record.insert_info.push_back (frii);
            }
      }

      /* Alignment: act as a proxy for the diskstream */

      if ((fnode = find_named_node (*pending_state, X_("alignment"))) != 0) {

            if ((prop = fnode->property (X_("style"))) != 0) {

                  /* fix for older sessions from before EnumWriter */

                  string pstr;

                  if (prop->value() == "capture") {
                        pstr = "CaptureTime";
                  } else if (prop->value() == "existing") {
                        pstr = "ExistingMaterial";
                  } else {
                        pstr = prop->value();
                  }

                  AlignStyle as = AlignStyle (string_2_enum (pstr, as));
                  _diskstream->set_persistent_align_style (as);
            }
      }
      return;
}     

uint32_t
AudioTrack::n_process_buffers ()
{
      return max ((uint32_t) _diskstream->n_channels(), redirect_max_outs);
}

void
AudioTrack::passthru_silence (nframes_t start_frame, nframes_t end_frame, nframes_t nframes, nframes_t offset, int declick, bool meter)
{
      uint32_t nbufs = n_process_buffers ();
      process_output_buffers (_session.get_silent_buffers (nbufs), nbufs, start_frame, end_frame, nframes, offset, true, declick, meter);
}

int 
AudioTrack::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 (!_active) {
            silence (nframes, offset);
            return 0;
      }

      if (session_state_changing) {

            /* XXX is this safe to do against transport state changes? */

            passthru_silence (start_frame, end_frame, nframes, offset, 0, false);
            return 0;
      }

      audio_diskstream()->check_record_status (start_frame, nframes, can_record);

      bool send_silence;
      
      if (_have_internal_generator) {
            /* since the instrument has no input streams,
               there is no reason to send any signal
               into the route.
            */
            send_silence = true;
      } else {

            if (Config->get_auto_input()) {
                  if (Config->get_monitoring_model() == SoftwareMonitoring) {
                        send_silence = false;
                  } else {
                        send_silence = true;
                  }
            } else {
                  if (_diskstream->record_enabled()) {
                        if (Config->get_monitoring_model() == SoftwareMonitoring) {
                              send_silence = false;
                        } else {
                              send_silence = true;
                        }
                  } else {
                        send_silence = true;
                  }
            }
      }

      apply_gain_automation = false;

      if (send_silence) {
            
            /* if we're sending silence, but we want the meters to show levels for the signal,
               meter right here.
            */
            
            if (_have_internal_generator) {
                  passthru_silence (start_frame, end_frame, nframes, offset, 0, true);
            } else {
                  if (_meter_point == MeterInput) {
                        just_meter_input (start_frame, end_frame, nframes, offset);
                  }
                  passthru_silence (start_frame, end_frame, nframes, offset, 0, false);
            }

      } else {
      
            /* we're sending signal, but we may still want to meter the input. 
             */

            passthru (start_frame, end_frame, nframes, offset, 0, (_meter_point == MeterInput));
      }

      return 0;
}

int
AudioTrack::roll (nframes_t nframes, nframes_t start_frame, nframes_t end_frame, nframes_t offset, int declick,
              bool can_record, bool rec_monitors_input)
{
      int dret;
      Sample* b;
      Sample* tmpb;
      nframes_t transport_frame;
      boost::shared_ptr<AudioDiskstream> diskstream = audio_diskstream();
      
      {
            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 (start_frame);
            }
      }

      
      if (n_outputs() == 0 && _redirects.empty()) {
            return 0;
      }

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

      transport_frame = _session.transport_frame();

      if ((nframes = check_initial_delay (nframes, offset, transport_frame)) == 0) {
            /* need to do this so that the diskstream sets its
               playback distance to zero, thus causing diskstream::commit
               to do nothing.
            */
            return diskstream->process (transport_frame, 0, 0, can_record, rec_monitors_input);
      } 

      _silent = false;
      apply_gain_automation = false;

      if ((dret = diskstream->process (transport_frame, nframes, offset, can_record, rec_monitors_input)) != 0) {
            
            silence (nframes, offset);

            return dret;
      }

      /* special condition applies */
      
      if (_meter_point == MeterInput) {
            just_meter_input (start_frame, end_frame, nframes, offset);
      }

      if (diskstream->record_enabled() && !can_record && !Config->get_auto_input()) {

            /* not actually recording, but we want to hear the input material anyway,
               at least potentially (depending on monitoring options)
             */

            passthru (start_frame, end_frame, nframes, offset, 0, true);

      } else if ((b = diskstream->playback_buffer(0)) != 0) {

            /*
              XXX is it true that the earlier test on n_outputs()
              means that we can avoid checking it again here? i think
              so, because changing the i/o configuration of an IO
              requires holding the AudioEngine lock, which we hold
              while in the process() tree.
            */

            
            /* copy the diskstream data to all output buffers */
            
            vector<Sample*>& bufs = _session.get_passthru_buffers ();
            uint32_t limit = n_process_buffers ();
            
            uint32_t n;
            uint32_t i;


            for (i = 0, n = 1; i < limit; ++i, ++n) {
                  memcpy (bufs[i], b, sizeof (Sample) * nframes); 
                  if (n < diskstream->n_channels()) {
                        tmpb = diskstream->playback_buffer(n);
                        if (tmpb!=0) {
                              b = tmpb;
                        }
                  }
            }

            /* don't waste time with automation if we're recording or we've just stopped (yes it can happen) */

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

            process_output_buffers (bufs, limit, start_frame, end_frame, nframes, offset, (!_session.get_record_enabled() || !Config->get_do_not_record_plugins()), declick, (_meter_point != MeterInput));
            
      } else {
            /* problem with the diskstream; just be quiet for a bit */
            silence (nframes, offset);
      }

      return 0;
}

int
AudioTrack::silent_roll (nframes_t nframes, nframes_t start_frame, nframes_t end_frame, nframes_t offset, 
                   bool can_record, bool rec_monitors_input)
{
      if (n_outputs() == 0 && _redirects.empty()) {
            return 0;
      }

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

      _silent = true;
      apply_gain_automation = false;

      silence (nframes, offset);

      return audio_diskstream()->process (_session.transport_frame() + offset, nframes, offset, can_record, rec_monitors_input);
}

int
AudioTrack::export_stuff (vector<Sample*>& buffers, uint32_t nbufs, nframes_t start, nframes_t nframes)
{
      gain_t  gain_automation[nframes];
      gain_t  gain_buffer[nframes];
      float   mix_buffer[nframes];
      RedirectList::iterator i;
      bool post_fader_work = false;
      gain_t this_gain = _gain;
      vector<Sample*>::iterator bi;
      Sample * b;
      boost::shared_ptr<AudioDiskstream> diskstream = audio_diskstream();
      
      Glib::RWLock::ReaderLock rlock (redirect_lock);

      boost::shared_ptr<AudioPlaylist> apl = boost::dynamic_pointer_cast<AudioPlaylist>(diskstream->playlist());
      assert(apl);

      if (apl->read (buffers[0], mix_buffer, gain_buffer, start, nframes) != nframes) {
            return -1;
      }

      uint32_t n=1;
      bi = buffers.begin();
      b = buffers[0];
      ++bi;
      for (; bi != buffers.end(); ++bi, ++n) {
            if (n < diskstream->n_channels()) {
                  if (apl->read ((*bi), mix_buffer, gain_buffer, start, nframes, n) != nframes) {
                        return -1;
                  }
                  b = (*bi);
            }
            else {
                  /* duplicate last across remaining buffers */
                  memcpy ((*bi), b, sizeof (Sample) * nframes); 
            }
      }


      /* note: only run inserts during export. other layers in the machinery
         will already have checked that there are no external port inserts.
      */
      
      for (i = _redirects.begin(); i != _redirects.end(); ++i) {
            boost::shared_ptr<Insert> insert;
            
            if ((insert = boost::dynamic_pointer_cast<Insert>(*i)) != 0) {
                  switch (insert->placement()) {
                  case PreFader:
                        insert->run (buffers, nbufs, nframes, 0);
                        break;
                  case PostFader:
                        post_fader_work = true;
                        break;
                  }
            }
      }
      
      if (_gain_automation_curve.automation_state() == Play) {
            
            _gain_automation_curve.get_vector (start, start + nframes, gain_automation, nframes);

            for (bi = buffers.begin(); bi != buffers.end(); ++bi) {
                  Sample *b = *bi;
                  for (nframes_t n = 0; n < nframes; ++n) {
                        b[n] *= gain_automation[n];
                  }
            }

      } else {

            for (bi = buffers.begin(); bi != buffers.end(); ++bi) {
                  Sample *b = *bi;
                  for (nframes_t n = 0; n < nframes; ++n) {
                        b[n] *= this_gain;
                  }
            }
      }

      if (post_fader_work) {

            for (i = _redirects.begin(); i != _redirects.end(); ++i) {
                  boost::shared_ptr<PluginInsert> insert;
                  
                  if ((insert = boost::dynamic_pointer_cast<PluginInsert>(*i)) != 0) {
                        switch ((*i)->placement()) {
                        case PreFader:
                              break;
                        case PostFader:
                              insert->run (buffers, nbufs, nframes, 0);
                              break;
                        }
                  }
            }
      } 

      return 0;
}

void
AudioTrack::bounce (InterThreadInfo& itt)
{
      vector<boost::shared_ptr<AudioSource> > srcs;
      _session.write_one_audio_track (*this, 0, _session.current_end_frame(), false, srcs, itt);
}


void
AudioTrack::bounce_range (nframes_t start, nframes_t end, InterThreadInfo& itt)
{
      vector<boost::shared_ptr<AudioSource> > srcs;
      _session.write_one_audio_track (*this, start, end, false, srcs, itt);
}

void
AudioTrack::freeze (InterThreadInfo& itt)
{
      vector<boost::shared_ptr<AudioSource> > srcs;
      string new_playlist_name;
      boost::shared_ptr<Playlist> new_playlist;
      string dir;
      string region_name;
      boost::shared_ptr<AudioDiskstream> diskstream = audio_diskstream();
      
      if ((_freeze_record.playlist = boost::dynamic_pointer_cast<AudioPlaylist>(diskstream->playlist())) == 0) {
            return;
      }

      uint32_t n = 1;

      while (n < (UINT_MAX-1)) {
       
            string candidate;
            
            candidate = string_compose ("<F%2>%1", _freeze_record.playlist->name(), n);

            if (_session.playlist_by_name (candidate) == 0) {
                  new_playlist_name = candidate;
                  break;
            }

            ++n;

      } 

      if (n == (UINT_MAX-1)) {
        error << string_compose (X_("There are too many frozen versions of playlist \"%1\""
                      " to create another one"), _freeze_record.playlist->name())
             << endmsg;
            return;
      }

      if (_session.write_one_audio_track (*this, _session.current_start_frame(), _session.current_end_frame(), true, srcs, itt)) {
            return;
      }

      _freeze_record.insert_info.clear ();
      _freeze_record.have_mementos = true;

      {
            Glib::RWLock::ReaderLock lm (redirect_lock);
            
            for (RedirectList::iterator r = _redirects.begin(); r != _redirects.end(); ++r) {
                  
                  boost::shared_ptr<Insert> insert;

                  if ((insert = boost::dynamic_pointer_cast<Insert>(*r)) != 0) {
                        
                        FreezeRecordInsertInfo* frii  = new FreezeRecordInsertInfo ((*r)->get_state(), insert);
                        
                        frii->id = insert->id();

                        _freeze_record.insert_info.push_back (frii);
                        
                        /* now deactivate the insert */
                        
                        insert->set_active (false, this);
                  }
            }
      }

      new_playlist = PlaylistFactory::create (_session, new_playlist_name, false);
      region_name = new_playlist_name;

      /* create a new region from all filesources, keep it private */

      boost::shared_ptr<Region> region (RegionFactory::create (srcs, 0, srcs[0]->length(), 
                                                 region_name, 0, 
                                                 (AudioRegion::Flag) (AudioRegion::WholeFile|AudioRegion::DefaultFlags),
                                                 false));

      new_playlist->set_orig_diskstream_id (diskstream->id());
      new_playlist->add_region (region, _session.current_start_frame());
      new_playlist->set_frozen (true);
      region->set_locked (true);

      diskstream->use_playlist (boost::dynamic_pointer_cast<AudioPlaylist>(new_playlist));
      diskstream->set_record_enabled (false);

      _freeze_record.state = Frozen;
      FreezeChange(); /* EMIT SIGNAL */
}

void
AudioTrack::unfreeze ()
{
      if (_freeze_record.playlist) {
            audio_diskstream()->use_playlist (_freeze_record.playlist);

            if (_freeze_record.have_mementos) {

                  for (vector<FreezeRecordInsertInfo*>::iterator i = _freeze_record.insert_info.begin(); i != _freeze_record.insert_info.end(); ++i) {
                        (*i)->memento ();
                  }

            } else {

                  Glib::RWLock::ReaderLock lm (redirect_lock); // should this be a write lock? jlc
                  for (RedirectList::iterator i = _redirects.begin(); i != _redirects.end(); ++i) {
                        for (vector<FreezeRecordInsertInfo*>::iterator ii = _freeze_record.insert_info.begin(); ii != _freeze_record.insert_info.end(); ++ii) {
                              if ((*ii)->id == (*i)->id()) {
                                    (*i)->set_state (((*ii)->state));
                                    break;
                              }
                        }
                  }
            }
            
            _freeze_record.playlist.reset ();
      }

      _freeze_record.state = UnFrozen;
      FreezeChange (); /* EMIT SIGNAL */
}


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