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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.

    $Id: audio_track.cc,v 1.75 2005/12/28 21:38:52 essej Exp $
*/

#include <sigc++/rettype.h>
#include <sigc++/bind.h>

#include <ardour/audio_track.h>
#include <ardour/diskstream.h>
#include <ardour/session.h>
#include <ardour/redirect.h>
#include <ardour/audioregion.h>
#include <ardour/route_group_specialized.h>
#include <ardour/insert.h>
#include <ardour/audioplaylist.h>
#include <ardour/panner.h>
#include <ardour/utils.h>

#include "i18n.h"

using namespace std;
using namespace SigC;
using namespace ARDOUR;

AudioTrack::AudioTrack (Session& sess, string name, Route::Flag flag)
      : Route (sess, name, 1, -1, -1, -1, flag),
        diskstream (0),
        _midi_rec_enable_control (*this, _session.midi_port())
{
      DiskStream::Flag dflags = DiskStream::Flag (0);

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

      DiskStream* ds = new DiskStream (_session, name, dflags);
      
      set_diskstream (*ds, this);
      
      _declickable = true;
      _freeze_record.state = NoFreeze;
      _saved_meter_point = _meter_point;

      // we do this even though Route already did it in it's init
      reset_midi_control (_session.midi_port(), _session.get_midi_control());
      
}

AudioTrack::AudioTrack (Session& sess, const XMLNode& node)
      : Route (sess, "to be renamed", 0, 0, -1, -1),
        diskstream (0),
        _midi_rec_enable_control (*this, _session.midi_port())
{
      _freeze_record.state = NoFreeze;
      set_state (node);
      _declickable = true;
      _saved_meter_point = _meter_point;

      // we do this even though Route already did it in it's init
      reset_midi_control (_session.midi_port(), _session.get_midi_control());
}

AudioTrack::~AudioTrack ()
{
      if (diskstream) {
            diskstream->unref();
      }
}

int
AudioTrack::deprecated_use_diskstream_connections ()
{
      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 << compose(_("Unknown connection \"%1\" listed for input of %2"), prop->value(), _name) << endmsg;
                  
                  if ((c = _session.connection_by_name (_("in 1"))) == 0) {
                        error << _("No input connections available as a replacement")
                              << endmsg;
                        return -1;
                  } else {
                        info << compose (_("Connection %1 was not available - \"in 1\" used instead"), prop->value())
                             << endmsg;
                  }
            }

            use_input_connection (*c, this);

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

int
AudioTrack::set_diskstream (DiskStream& ds, void *src)
{
      if (diskstream) {
            diskstream->unref();
      }

      diskstream = &ds.ref();
      diskstream->set_io (*this);

      if (diskstream->deprecated_io_node) {

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

      diskstream->set_record_enabled (false, this);
      diskstream->monitor_input (false);

      ic_connection.disconnect();
      ic_connection = input_changed.connect (slot (*diskstream, &DiskStream::handle_input_change));

      diskstream_changed (src); /* EMIT SIGNAL */

      return 0;
}     

int 
AudioTrack::use_diskstream (string name)
{
      DiskStream *dstream;

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

int 
AudioTrack::use_diskstream (id_t id)
{
      DiskStream *dstream;

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

bool
AudioTrack::record_enabled () const
{
      return diskstream->record_enabled ();
}

void
AudioTrack::set_record_enable (bool yn, void *src)
{
      if (_freeze_record.state == Frozen) {
            return;
      }

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

      /* keep track of the meter point as it was before we rec-enabled */

      if (!diskstream->record_enabled()) {
            _saved_meter_point = _meter_point;
      }
      
      diskstream->set_record_enabled (yn, src);

      if (diskstream->record_enabled()) {
            set_meter_point (MeterInput, this);
      } else {
            set_meter_point (_saved_meter_point, this);
      }

      if (_session.get_midi_feedback()) {
            _midi_rec_enable_control.send_feedback (record_enabled());
      }

}

void
AudioTrack::set_meter_point (MeterPoint p, void *src)
{
      Route::set_meter_point (p, src);
}

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

      /* 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.
      */

      snprintf (buf, sizeof (buf), "%" PRIu64, diskstream->id());
      track_state.add_property ("diskstream-id", buf);

      return track_state;
}

int
AudioTrack::set_state (const XMLNode& node)
{
      const XMLProperty *prop;
      XMLNodeConstIterator iter;
      XMLNodeList midi_kids;

      if (Route::set_state (node)) {
            return -1;
      }

      midi_kids = node.children ("MIDI");
      
      for (iter = midi_kids.begin(); iter != midi_kids.end(); ++iter) {
      
            XMLNodeList kids;
            XMLNodeConstIterator miter;
            XMLNode*    child;

            kids = (*iter)->children ();

            for (miter = kids.begin(); miter != kids.end(); ++miter) {

                  child =* miter;

                  if (child->name() == "rec_enable") {
                  
                        MIDI::eventType ev = MIDI::on; /* initialize to keep gcc happy */
                        MIDI::byte additional = 0;  /* ditto */
                        MIDI::channel_t chn = 0;    /* ditto */

                        if (get_midi_node_info (child, ev, chn, additional)) {
                              _midi_rec_enable_control.set_control_type (chn, ev, additional);
                        } else {
                              error << compose(_("MIDI rec_enable control specification for %1 is incomplete, so it has been ignored"), _name) << endmsg;
                        }
                  }
            }
      }

      
      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 {
            
            id_t id = strtoull (prop->value().c_str(), 0, 10);
            
            if (use_diskstream (id)) {
                  return -1;
            }
      }

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

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

      return 0;
}

XMLNode& 
AudioTrack::get_state()
{
      XMLNode& root (Route::get_state());
      XMLNode* freeze_node;
      char buf[32];

      if (_freeze_record.playlist) {
            XMLNode* inode;

            freeze_node = new XMLNode (X_("freeze-info"));
            freeze_node->add_property ("playlist", _freeze_record.playlist->name());
            snprintf (buf, sizeof (buf), "%d", (int) _freeze_record.state);
            freeze_node->add_property ("state", buf);

            for (vector<FreezeRecordInsertInfo*>::iterator i = _freeze_record.insert_info.begin(); i != _freeze_record.insert_info.end(); ++i) {
                  inode = new XMLNode (X_("insert"));
                  snprintf (buf, sizeof (buf), "%" PRIu64, (*i)->id);
                  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"));
      switch (diskstream->alignment_style()) {
      case ExistingMaterial:
            snprintf (buf, sizeof (buf), X_("existing"));
            break;
      case CaptureTime:
            snprintf (buf, sizeof (buf), X_("capture"));
            break;
      }
      align_node->add_property (X_("style"), buf);
      root.add_child_nocopy (*align_node);

      /* MIDI control */

      MIDI::channel_t chn;
      MIDI::eventType ev;
      MIDI::byte      additional;
      XMLNode*        midi_node = 0;
      XMLNode*        child;
      XMLNodeList     midikids;

      midikids = root.children ("MIDI");
      if (!midikids.empty()) {
            midi_node = midikids.front();
      }
      else {
            midi_node = root.add_child ("MIDI");
      }
            
      if (_midi_rec_enable_control.get_control_info (chn, ev, additional) && midi_node) {

            child = midi_node->add_child ("rec_enable");
            set_midi_node_info (child, ev, chn, additional);
      }

      
      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) {
                  Playlist* pl = _session.playlist_by_name (prop->value());
                  if (pl) {
                        _freeze_record.playlist = dynamic_cast<AudioPlaylist*> (pl);
                  } else {
                        _freeze_record.playlist = 0;
                        _freeze_record.state = NoFreeze;
                  return;
                  }
            }
            
            if ((prop = fnode->property (X_("state"))) != 0) {
                  _freeze_record.state = (FreezeState) atoi (prop->value().c_str());
            }
            
            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()));
                  frii->insert = 0;
                  sscanf (prop->value().c_str(), "%llu", &frii->id);
                  _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) {
                  if (prop->value() == "existing") {
                        diskstream->set_persistent_align_style (ExistingMaterial);
                  } else if (prop->value() == "capture") {
                        diskstream->set_persistent_align_style (CaptureTime);
                  }
            }
      }
      return;
}     

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

void
AudioTrack::passthru_silence (jack_nframes_t start_frame, jack_nframes_t end_frame, jack_nframes_t nframes, jack_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 (jack_nframes_t nframes, jack_nframes_t start_frame, jack_nframes_t end_frame, jack_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;
      }

      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 (_session.get_auto_input()) {
                  if (Config->get_no_sw_monitoring()) {
                        send_silence = true;
                  } else {
                        send_silence = false;
                  }
            } else {
                  if (diskstream->record_enabled()) {
                        if (Config->get_no_sw_monitoring()) {
                              send_silence = true;
                        } else {
                              send_silence = false;
                        }
                  } 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 (jack_nframes_t nframes, jack_nframes_t start_frame, jack_nframes_t end_frame, jack_nframes_t offset, int declick,
              bool can_record, bool rec_monitors_input)
{
      int dret;
      Sample* b;
      Sample* tmpb;
      jack_nframes_t transport_frame;

      {
            TentativeRWLockMonitor lm (redirect_lock, false, __LINE__, __FILE__);
            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 && !_session.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()) {
                  TentativeLockMonitor am (automation_lock, __LINE__, __FILE__);
                  
                  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() || _session.get_recording_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 (jack_nframes_t nframes, jack_nframes_t start_frame, jack_nframes_t end_frame, jack_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 diskstream->process (_session.transport_frame() + offset, nframes, offset, can_record, rec_monitors_input);
}

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

int
AudioTrack::set_name (string str, void *src)
{
      if (record_enabled() && _session.actively_recording()) {
            /* this messes things up if done while recording */
            return -1;
      }

      diskstream->set_name (str, src);
      return IO::set_name (str, src);
}

int
AudioTrack::export_stuff (vector<Sample*>& buffers, uint32_t nbufs, jack_nframes_t start, jack_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;
      
      RWLockMonitor rlock (redirect_lock, false, __LINE__, __FILE__);
            
      if (diskstream->playlist()->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 (diskstream->playlist()->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) {
            Insert *insert;
            
            if ((insert = dynamic_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 (jack_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 (jack_nframes_t n = 0; n < nframes; ++n) {
                        b[n] *= this_gain;
                  }
            }
      }

      if (post_fader_work) {

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

      return 0;
}

void
AudioTrack::set_latency_delay (jack_nframes_t longest_session_latency)
{
      Route::set_latency_delay (longest_session_latency);
      diskstream->set_roll_delay (_roll_delay);
}

jack_nframes_t
AudioTrack::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);

      return _own_latency;
}

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


void
AudioTrack::bounce_range (jack_nframes_t start, jack_nframes_t end, InterThreadInfo& itt)
{
      vector<Source*> srcs;
      _session.write_one_track (*this, start, end, false, srcs, itt);
}

void
AudioTrack::freeze (InterThreadInfo& itt)
{
      Insert* insert;
      vector<Source*> srcs;
      string new_playlist_name;
      Playlist* new_playlist;
      string dir;
      AudioRegion* region;
      string region_name;
      
      if ((_freeze_record.playlist = diskstream->playlist()) == 0) {
            return;
      }

      uint32_t n = 1;

      while (n < ULONG_MAX) {

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

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

            ++n;

      } 

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

      if (_session.write_one_track (*this, 0, _session.current_end_frame(), true, srcs, itt)) {
            return;
      }

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

      {
            RWLockMonitor lm (redirect_lock, false, __LINE__, __FILE__);
            
            for (RedirectList::iterator r = _redirects.begin(); r != _redirects.end(); ++r) {
                  
                  if ((insert = dynamic_cast<Insert*>(*r)) != 0) {
                        
                        FreezeRecordInsertInfo* frii  = new FreezeRecordInsertInfo ((*r)->get_state());
                        
                        frii->insert = insert;
                        frii->id = insert->id();
                        frii->memento = (*r)->get_memento();
                        
                        _freeze_record.insert_info.push_back (frii);
                        
                        /* now deactivate the insert */
                        
                        insert->set_active (false, this);
                  }
            }
      }

      new_playlist = new AudioPlaylist (_session, new_playlist_name, false);
      region_name = new_playlist_name;

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

      region = new AudioRegion (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, 0);
      new_playlist->set_frozen (true);
      region->set_locked (true);

      diskstream->use_playlist (dynamic_cast<AudioPlaylist*>(new_playlist));
      diskstream->set_record_enabled (false, this);

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

void
AudioTrack::unfreeze ()
{
      if (_freeze_record.playlist) {
            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 {

                  RWLockMonitor lm (redirect_lock, false, __LINE__, __FILE__); // 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 = 0;
      }

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

AudioTrack::FreezeRecord::~FreezeRecord ()
{
      for (vector<FreezeRecordInsertInfo*>::iterator i = insert_info.begin(); i != insert_info.end(); ++i) {
            delete *i;
      }
}

AudioTrack::FreezeState
AudioTrack::freeze_state() const
{
      return _freeze_record.state;
}


void
AudioTrack::reset_midi_control (MIDI::Port* port, bool on)
{
      MIDI::channel_t chn;
      MIDI::eventType ev;
      MIDI::byte extra;

      Route::reset_midi_control (port, on);
      
      _midi_rec_enable_control.get_control_info (chn, ev, extra);
      if (!on) {
            chn = -1;
      }
      _midi_rec_enable_control.midi_rebind (port, chn);
}

void
AudioTrack::send_all_midi_feedback ()
{
      if (_session.get_midi_feedback()) {

            Route::send_all_midi_feedback();

            _midi_rec_enable_control.send_feedback (record_enabled());
      }
}


AudioTrack::MIDIRecEnableControl::MIDIRecEnableControl (AudioTrack& s,  MIDI::Port* port)
      : MIDI::Controllable (port, 0), track (s), setting(false)
{
      last_written = false; /* XXX need a good out of bound value */
}

void
AudioTrack::MIDIRecEnableControl::set_value (float val)
{
      bool bval = ((val >= 0.5f) ? true: false);
      
      setting = true;
      track.set_record_enable (bval, this);
      setting = false;
}

void
AudioTrack::MIDIRecEnableControl::send_feedback (bool value)
{

      if (!setting && get_midi_feedback()) {
            MIDI::byte val = (MIDI::byte) (value ? 127: 0);
            MIDI::channel_t ch = 0;
            MIDI::eventType ev = MIDI::none;
            MIDI::byte additional = 0;
            MIDI::EventTwoBytes data;
          
            if (get_control_info (ch, ev, additional)) {
                  data.controller_number = additional;
                  data.value = val;

                  track._session.send_midi_message (get_port(), ev, ch, data);
            }
      }
      
}

MIDI::byte*
AudioTrack::MIDIRecEnableControl::write_feedback (MIDI::byte* buf, int32_t& bufsize, bool val, bool force)
{
      if (get_midi_feedback()) {

            MIDI::channel_t ch = 0;
            MIDI::eventType ev = MIDI::none;
            MIDI::byte additional = 0;

            if (get_control_info (ch, ev, additional)) {
                  if (val != last_written || force) {
                        *buf++ = ev & ch;
                        *buf++ = additional; /* controller number */
                        *buf++ = (MIDI::byte) (val ? 127: 0);
                        last_written = val;
                        bufsize -= 3;
                  }
            }
      }

      return buf;
}

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