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session_state.cc

/*
  Copyright (C) 1999-2002 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: session_state.cc,v 1.157 2006/02/17 04:48:46 essej Exp $
*/

#include <algorithm>
#include <fstream>
#include <string>
#include <cerrno>

#include <sigc++/bind.h>

#include <cstdio> /* snprintf(3) ... grrr */
#include <cmath>
#include <unistd.h>
#include <sys/stat.h>
#include <climits>
#include <fcntl.h>
#include <poll.h>
#include <signal.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <dirent.h>

#ifdef HAVE_SYS_VFS_H
#include <sys/vfs.h>
#else
#include <sys/mount.h>
#include <sys/param.h>
#endif

#include <midi++/mmc.h>
#include <midi++/port.h>
#include <pbd/error.h>
#include <pbd/dirname.h>
#include <pbd/lockmonitor.h>
#include <pbd/pathscanner.h>
#include <pbd/pthread_utils.h>
#include <pbd/basename.h>
#include <pbd/strsplit.h>

#include <ardour/audioengine.h>
#include <ardour/configuration.h>
#include <ardour/session.h>
#include <ardour/diskstream.h>
#include <ardour/utils.h>
#include <ardour/audioplaylist.h>
#include <ardour/source.h>
#include <ardour/filesource.h>
#include <ardour/sndfilesource.h>
#include <ardour/sndfile_helpers.h>
#include <ardour/auditioner.h>
#include <ardour/export.h>
#include <ardour/redirect.h>
#include <ardour/send.h>
#include <ardour/insert.h>
#include <ardour/connection.h>
#include <ardour/slave.h>
#include <ardour/tempo.h>
#include <ardour/audio_track.h>
#include <ardour/cycle_timer.h>
#include <ardour/utils.h>
#include <ardour/named_selection.h>
#include <ardour/version.h>
#include <ardour/location.h>
#include <ardour/audioregion.h>
#include <ardour/crossfade.h>

#include "i18n.h"
#include <locale.h>

using namespace std;
using namespace ARDOUR;

void
Session::first_stage_init (string fullpath, string snapshot_name)
{
      if (fullpath.length() == 0) {
            throw failed_constructor();
      }

      char buf[PATH_MAX+1];
      if (!realpath(fullpath.c_str(), buf) && (errno != ENOENT)) {
            error << compose(_("Could not use path %1 (%s)"), buf, strerror(errno)) << endmsg;
            throw failed_constructor();
      }
      _path = string(buf);

      if (_path[_path.length()-1] != '/') {
            _path += '/';
      }

      /* these two are just provisional settings. set_state()
         will likely override them.
      */

      _name = _current_snapshot_name = snapshot_name;
      setup_raid_path (_path);

      _current_frame_rate = _engine.frame_rate ();
      _tempo_map = new TempoMap (_current_frame_rate);
      _tempo_map->StateChanged.connect (slot (*this, &Session::tempo_map_changed));

      atomic_set (&processing_prohibited, 0);
      send_cnt = 0;
      insert_cnt = 0;
      _transport_speed = 0;
      _last_transport_speed = 0;
      transport_sub_state = 0;
      _transport_frame = 0;
      last_stop_frame = 0;
      end_location = new Location (0, 0, _("end"), Location::Flags ((Location::IsMark|Location::IsEnd)));
      _end_location_is_free = true;
      atomic_set (&_record_status, Disabled);
      auto_play = false;
      punch_in = false;
      punch_out = false;
      auto_loop = false;
      seamless_loop = false;
      loop_changing = false;
      auto_input = true;
      crossfades_active = false;
      all_safe = false;
      auto_return = false;
      _last_roll_location = 0;
      _last_record_location = 0;
      pending_locate_frame = 0;
      pending_locate_roll = false;
      pending_locate_flush = false;
      dstream_buffer_size = 0;
      state_tree = 0;
      state_was_pending = false;
      set_next_event ();
      outbound_mtc_smpte_frame = 0;
      next_quarter_frame_to_send = -1;
      current_block_size = 0;
      _solo_latched = true;
      _solo_model = InverseMute;
      solo_update_disabled = false;
      currently_soloing = false;
      _worst_output_latency = 0;
      _worst_input_latency = 0;
      _worst_track_latency = 0;
      _state_of_the_state = StateOfTheState(CannotSave|InitialConnecting|Loading);
      _slave = 0;
      _slave_type = None;
      butler_mixdown_buffer = 0;
      butler_gain_buffer = 0;
      auditioner = 0;
      mmc_control = false;
      midi_feedback = false;
      midi_control = true;
      mmc = 0;
      post_transport_work = PostTransportWork (0);
      atomic_set (&butler_should_do_transport_work, 0);
      atomic_set (&butler_active, 0);
      atomic_set (&_playback_load, 100);
      atomic_set (&_capture_load, 100);
      atomic_set (&_playback_load_min, 100);
      atomic_set (&_capture_load_min, 100);
      pending_audition_region = 0;
      _edit_mode = Slide;
      pending_edit_mode = _edit_mode;
      _play_range = false;
      align_style = ExistingMaterial;
      _control_out = 0;
      _master_out = 0;
      input_auto_connect = AutoConnectOption (0);
      output_auto_connect = AutoConnectOption (0);
      _have_captured = false;
      waiting_to_start = false;
      _exporting = false;
      _gain_automation_buffer = 0;
      _pan_automation_buffer = 0;
      _npan_buffers = 0;
      pending_abort = false;
      layer_model = MoveAddHigher;
      xfade_model = ShortCrossfade;
      
      /* default short fade = 15ms */

      Crossfade::set_short_xfade_length ((jack_nframes_t) floor ((15.0 * frame_rate()) / 1000.0));

      last_mmc_step.tv_sec = 0;
      last_mmc_step.tv_usec = 0;
      step_speed = 0.0;

      preroll.type = AnyTime::Frames;
      preroll.frames = 0;
      postroll.type = AnyTime::Frames;
      postroll.frames = 0;

      /* click sounds are unset by default, which causes us to internal
         waveforms for clicks.
      */
      
      _click_io = 0;
      _clicking = false;
      click_requested = false;
      click_data = 0;
      click_emphasis_data = 0;
      click_length = 0;
      click_emphasis_length = 0;

      process_function = &Session::process_with_events;

      last_smpte_when = 0;
      _smpte_offset = 0;
      _smpte_offset_negative = true;
      last_smpte_valid = false;

      last_rr_session_dir = session_dirs.begin();
      refresh_disk_space ();

      // set_default_fade (0.2, 5.0); /* steepness, millisecs */

      /* default configuration */

      recording_plugins = false;
      over_length_short = 2;
      over_length_long = 10;
      send_midi_timecode = false;
      send_midi_machine_control = false;
      shuttle_speed_factor = 1.0;
      shuttle_speed_threshold = 5;
      rf_speed = 2.0;
      _meter_hold = 100; // XXX unknown units: number of calls to meter::set()
      _meter_falloff = 1.5f; // XXX unknown units: refresh_rate
      max_level = 0;
      min_level = 0;

      /* slave stuff */

      average_slave_delta = 1800;
      have_first_delta_accumulator = false;
      delta_accumulator_cnt = 0;
      slave_state = Stopped;

      /* default SMPTE type is 30 FPS, non-drop */

      set_smpte_type (30.0, false);

      _engine.GraphReordered.connect (slot (*this, &Session::graph_reordered));

      /* These are all static "per-class" signals */

      Region::CheckNewRegion.connect (slot (*this, &Session::add_region));
      Source::SourceCreated.connect (slot (*this, &Session::add_source));
      Playlist::PlaylistCreated.connect (slot (*this, &Session::add_playlist));
      Redirect::RedirectCreated.connect (slot (*this, &Session::add_redirect));
      DiskStream::DiskStreamCreated.connect (slot (*this, &Session::add_diskstream));
      NamedSelection::NamedSelectionCreated.connect (slot (*this, &Session::add_named_selection));

      IO::MoreOutputs.connect (slot (*this, &Session::ensure_passthru_buffers));

      /* stop IO objects from doing stuff until we're ready for them */

      IO::disable_panners ();
      IO::disable_ports ();
      IO::disable_connecting ();
}

int
Session::second_stage_init (bool new_session)
{
      SndFileSource::set_peak_dir (peak_dir());

      if (!new_session) {
            if (load_state (_current_snapshot_name)) {
                  return -1;
            }
            remove_empty_sounds ();
      }

      if (start_butler_thread()) {
            return -1;
      }

      if (start_midi_thread ()) {
            return -1;
      }

      if (init_feedback ()) {
            return -1;
      }

      if (state_tree) {
            if (set_state (*state_tree->root())) {
                  return -1;
            }
      }

      /* we can't save till after ::when_engine_running() is called,
         because otherwise we save state with no connections made.
         therefore, we reset _state_of_the_state because ::set_state()
         will have cleared it.

         we also have to include Loading so that any events that get
         generated between here and the end of ::when_engine_running()
         will be processed directly rather than queued.
      */

      _state_of_the_state = StateOfTheState (_state_of_the_state|CannotSave|Loading);

      // set_auto_input (true);
      _locations.changed.connect (slot (this, &Session::locations_changed));
      _locations.added.connect (slot (this, &Session::locations_added));
      setup_click_sounds (0);
      setup_midi_control ();

      /* Pay attention ... */

      _engine.Halted.connect (slot (*this, &Session::engine_halted));
      _engine.Xrun.connect (slot (*this, &Session::xrun_recovery));

      if (_engine.running()) {
            when_engine_running();
      } else {
            first_time_running = _engine.Running.connect (slot (*this, &Session::when_engine_running));
      }

      send_full_time_code ();
      _engine.transport_locate (0);
      deliver_mmc (MIDI::MachineControl::cmdMmcReset, 0);
      deliver_mmc (MIDI::MachineControl::cmdLocate, 0);
      send_all_midi_feedback();

      if (new_session) {
            _end_location_is_free = true;
      } else {
            _end_location_is_free = false;
      }
      
      return 0;
}

string
Session::raid_path () const
{
      string path;

      for (vector<space_and_path>::const_iterator i = session_dirs.begin(); i != session_dirs.end(); ++i) {
            path += (*i).path;
            path += ':';
      }
      
      return path.substr (0, path.length() - 1); // drop final colon
}

void
Session::set_raid_path (string path)
{
      /* public-access to setup_raid_path() */

      setup_raid_path (path);
}

void
Session::setup_raid_path (string path)
{
      string::size_type colon;
      string remaining;
      space_and_path sp;
      string fspath;
      string::size_type len = path.length();
      int colons;

      colons = 0;

      if (path.length() == 0) {
            return;
      }

      session_dirs.clear ();

      for (string::size_type n = 0; n < len; ++n) {
            if (path[n] == ':') {
                  colons++;
            }
      }

      if (colons == 0) {

            /* no multiple search path, just one directory (common case) */

            sp.path = path;
            sp.blocks = 0;
            session_dirs.push_back (sp);
            
            FileSource::set_search_path (path + sound_dir_name);

            return;
      }

      remaining = path;

      while ((colon = remaining.find_first_of (':')) != string::npos) {
            
            sp.blocks = 0;
            sp.path = remaining.substr (0, colon);

            fspath += sp.path;
            if (fspath[fspath.length()-1] != '/') {
                  fspath += '/';
            }
            fspath += sound_dir_name;
            fspath += ':';

            session_dirs.push_back (sp);

            remaining = remaining.substr (colon+1);
      }

      if (remaining.length()) {

            sp.blocks = 0;
            sp.path = remaining;

            fspath += sp.path;
            if (fspath[fspath.length()-1] != '/') {
                  fspath += '/';
            }
            fspath += sound_dir_name;

            session_dirs.push_back (sp);
      }

      /* set the FileSource search path */

      FileSource::set_search_path (fspath);

      /* reset the round-robin soundfile path thingie */

      last_rr_session_dir = session_dirs.begin();
}

int
Session::create (bool& new_session, string* mix_template, jack_nframes_t initial_length)
{
      string dir;
      
      if (mkdir (_path.c_str(), 0755) < 0) {
            if (errno == EEXIST) {
                  new_session = false;
            } else {
                  error << compose(_("Session: cannot create session dir \"%1\" (%2)"), _path, strerror (errno)) << endmsg;
                  return -1;
            }
      } else {
            new_session = true;
      }

      dir = peak_dir ();

      if (mkdir (dir.c_str(), 0755) < 0) {
            if (errno != EEXIST) {
                  error << compose(_("Session: cannot create session peakfile dir \"%1\" (%2)"), dir, strerror (errno)) << endmsg;
                  return -1;
            }
      }

      dir = sound_dir ();

      if (mkdir (dir.c_str(), 0755) < 0) {
            if (errno != EEXIST) {
                  error << compose(_("Session: cannot create session sounds dir \"%1\" (%2)"), dir, strerror (errno)) << endmsg;
                  return -1;
            }
      }

      dir = dead_sound_dir ();

      if (mkdir (dir.c_str(), 0755) < 0) {
            if (errno != EEXIST) {
                  error << compose(_("Session: cannot create session dead sounds dir \"%1\" (%2)"), dir, strerror (errno)) << endmsg;
                  return -1;
            }
      }

      dir = automation_dir ();

      if (mkdir (dir.c_str(), 0755) < 0) {
            if (errno != EEXIST) {
                  error << compose(_("Session: cannot create session automation dir \"%1\" (%2)"), dir, strerror (errno)) << endmsg;
                  return -1;
            }
      }

      
      /* check new_session so we don't overwrite an existing one */
      
      if (mix_template) {
            if (new_session){

                  string lookfor = "^";
                  lookfor += *mix_template;
                  lookfor += _template_suffix;
                  lookfor += '$';

                  PathScanner scanner;
                  string tpath = template_path();
                  string in_path;
                  string out_path;

                  vector<string*>* result= scanner (tpath, lookfor, false, true);

                  if (result == 0) {
                        error << compose (_("Could not find a template called %1 in %2"), *mix_template, tpath)
                              << endmsg;
                        *mix_template = "";
                        return -1;
                  }

                  if (result->size() == 0) {
                        delete result;
                        error << compose (_("Could not find a template called %1 in %2"), *mix_template, tpath)
                              << endmsg;
                        *mix_template = "";
                        return -1;
                  }

                  in_path = *(result->front());

                  ifstream in(in_path.c_str());
                  
                  if (in){
                        string out_path = _path;
                        out_path += _name;
                        out_path += _statefile_suffix;
                        
                        ofstream out(out_path.c_str());

                        if (out){
                              out << in.rdbuf();
                              
                              // okay, session is set up.  Treat like normal saved
                              // session from now on.
                              
                              new_session = false;
                              return 0;
                              
                        } else {
                              error << compose (_("Could not open %1 for writing mix template"), out_path) 
                                    << endmsg;
                              return -1;
                        }
                        
                  } else {
                        error << compose (_("Could not open mix template %1 for reading"), in_path) 
                              << endmsg;
                        return -1;
                  }
                  
                  
            } else {
                  warning << _("Session already exists.  Not overwriting") << endmsg;
                  return -1;
            }
      }

      if (new_session) {

            /* set an initial end point */

            end_location->set_end (initial_length);
            _locations.add (end_location);

            _state_of_the_state = Clean;

            if (save_state (_current_snapshot_name)) {
                  return -1;
            }
      }

      return 0;
}

int
Session::load_diskstreams (const XMLNode& node)
{
      XMLNodeList          clist;
      XMLNodeConstIterator citer;
      
      clist = node.children();

      for (citer = clist.begin(); citer != clist.end(); ++citer) {
            
            DiskStream* dstream;

            try {
                  dstream = new DiskStream (*this, **citer);
                  /* added automatically by DiskStreamCreated handler */
            } 
            
            catch (failed_constructor& err) {
                  error << _("Session: could not load diskstream via XML state")                      << endmsg;
                  return -1;
            }
      }

      return 0;
}

void
Session::maybe_write_autosave()
{
      if (dirty() && record_status() != Recording) {
            save_state("", true);
      }
}

void
Session::remove_autosave()
{
      remove_pending_capture_state();
}


void
Session::remove_pending_capture_state ()
{
      string xml_path;

      xml_path = _path;
      xml_path += _current_snapshot_name;
      xml_path += _pending_suffix;

      unlink (xml_path.c_str());
}

int
Session::save_state (string snapshot_name, bool pending)
{
      XMLTree tree;
      string xml_path;
      string bak_path;

      if (_state_of_the_state & CannotSave) {
            return 1;
      }

      tree.set_root (&get_state());

      if (snapshot_name.empty()) {
            snapshot_name = _current_snapshot_name;
      }

      if (!pending) {

            xml_path = _path;
            xml_path += snapshot_name;
            xml_path += _statefile_suffix;
            bak_path = xml_path;
            bak_path += ".bak";
            
            // Make backup of state file
            
            if ((access (xml_path.c_str(), F_OK) == 0) &&
                (rename(xml_path.c_str(), bak_path.c_str()))) {
                  error << _("could not backup old state file, current state not saved.") << endmsg;
                  return -1;
            }

      } else {

            xml_path = _path;
            xml_path += snapshot_name;
            xml_path += _pending_suffix;

      }

      if (!tree.write (xml_path)) {
            error << compose (_("state could not be saved to %1"), xml_path) << endmsg;

            /* don't leave a corrupt file lying around if it is
               possible to fix.
            */

            if (unlink (xml_path.c_str())) {
                  error << compose (_("could not remove corrupt state file %1"), xml_path) << endmsg;
            } else {
                  if (!pending) {
                        if (rename (bak_path.c_str(), xml_path.c_str())) {
                              error << compose (_("could not restore state file from backup %1"), bak_path) << endmsg;
                        }
                  }
            }

            return -1;
      }

      if (!pending) {

            bool was_dirty = dirty();
            
            _state_of_the_state = StateOfTheState (_state_of_the_state & ~Dirty);
            
            if (was_dirty) {
                  DirtyChanged (); /* EMIT SIGNAL */
            }
            
            StateSaved (snapshot_name); /* EMIT SIGNAL */

            if (snapshot_name == _current_snapshot_name) {
                  // remove pending state
                  // TODO: leave the backup state around and
                  // do crash recovery by checking file mod dates
                  remove_pending_capture_state();
            }
            
      }

      return 0;
}

int
Session::restore_state (string snapshot_name)
{
      if (load_state (snapshot_name) == 0) {
            set_state (*state_tree->root());
      }
      
      return 0;
}

int
Session::load_state (string snapshot_name)
{
      if (state_tree) {
            delete state_tree;
            state_tree = 0;
      }

      string xmlpath;
      
      state_was_pending = false;

      /* check for leftover pending state from a crashed capture attempt */

      xmlpath = _path;
      xmlpath += snapshot_name;
      xmlpath += _pending_suffix;

      if (!access (xmlpath.c_str(), F_OK)) {

            /* there is pending state from a crashed capture attempt */

            if (AskAboutPendingState()) {
                  state_was_pending = true;
            } 
      } 

      if (!state_was_pending) {

            xmlpath = _path;
            xmlpath += snapshot_name;
            xmlpath += _statefile_suffix;
      }

      if (access (xmlpath.c_str(), F_OK)) {
            error << compose(_("%1: session state information file \"%2\" doesn't exist!"), _name, xmlpath) << endmsg;
            return 1;
      }

      state_tree = new XMLTree;

      set_dirty();

      if (state_tree->read (xmlpath)) {
            return 0;
      } else {
            error << compose(_("Could not understand ardour file %1"), xmlpath) << endmsg;
      }

      delete state_tree;
      state_tree = 0;
      return -1;
}

int
Session::load_options (const XMLNode& node)
{
      XMLNode* child;
      XMLProperty* prop;
      bool have_fade_msecs = false;
      bool have_fade_steepness = false;
      float fade_msecs = 0;
      float fade_steepness = 0;
      SlaveSource slave_src = None;
      int x;
      LocaleGuard lg (X_("POSIX"));
      
      if ((child = find_named_node (node, "input-auto-connect")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  sscanf (prop->value().c_str(), "%x", &x);
                  input_auto_connect = AutoConnectOption (x);
            }
      }

      if ((child = find_named_node (node, "output-auto-connect")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  sscanf (prop->value().c_str(), "%x", &x);
                  output_auto_connect = AutoConnectOption (x);
            }
      }
                        
      if ((child = find_named_node (node, "slave")) != 0) {
            if ((prop = child->property ("type")) != 0) {
                  if (prop->value() == "none") {
                        slave_src = None;
                  } else if (prop->value() == "mtc") {
                        slave_src = MTC;
                  } else if (prop->value() == "jack") {
                        slave_src = JACK;
                  }
                  set_slave_source (slave_src, 0);
            }
      }

      /* we cannot set edit mode if we are loading a session,
         because it might destroy the playlist's positioning
      */

      if ((child = find_named_node (node, "edit-mode")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  if (prop->value() == "slide") {
                        pending_edit_mode = Slide;
                  } else if (prop->value() == "splice") {
                        pending_edit_mode = Splice;
                  } 
            }
      }
                        
      if ((child = find_named_node (node, "send-midi-timecode")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  bool x = (prop->value() == "yes");
                  send_mtc = !x; /* force change in value */
                  set_send_mtc (x);
            }
      }
      if ((child = find_named_node (node, "send-midi-machine-control")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  bool x = (prop->value() == "yes");
                  send_mmc = !x; /* force change in value */
                  set_send_mmc (prop->value() == "yes");
            }
      }
      if ((child = find_named_node (node, "max-level")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  max_level = atoi (prop->value().c_str());
            }
      }
      if ((child = find_named_node (node, "min-level")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  min_level = atoi (prop->value().c_str());
            }
      }
      if ((child = find_named_node (node, "meter-hold")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  _meter_hold = atof (prop->value().c_str());
            }
      }
      if ((child = find_named_node (node, "meter-falloff")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  _meter_falloff = atof (prop->value().c_str());
            }
      }
      if ((child = find_named_node (node, "long-over-length")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  over_length_long = atoi (prop->value().c_str());
            }
      }
      if ((child = find_named_node (node, "short-over-length")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  over_length_short = atoi (prop->value().c_str());
            }
      }
      if ((child = find_named_node (node, "shuttle-speed-factor")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  shuttle_speed_factor = atof (prop->value().c_str());
            }
      }
      if ((child = find_named_node (node, "shuttle-speed-threshold")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  shuttle_speed_threshold = atof (prop->value().c_str());
            }
      }
      if ((child = find_named_node (node, "rf-speed")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  rf_speed = atof (prop->value().c_str());
            }
      }
      if ((child = find_named_node (node, "smpte-frames-per-second")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  set_smpte_type( atof (prop->value().c_str()), smpte_drop_frames );
            }
      }
      if ((child = find_named_node (node, "smpte-drop-frames")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  set_smpte_type( smpte_frames_per_second, (prop->value() == "yes") );
            }
      }
      if ((child = find_named_node (node, "smpte-offset")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  set_smpte_offset( atoi (prop->value().c_str()) );
            }
      }
      if ((child = find_named_node (node, "smpte-offset-negative")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  set_smpte_offset_negative( (prop->value() == "yes") );
            }
      }
      if ((child = find_named_node (node, "click-sound")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  click_sound = prop->value();
            }
      }
      if ((child = find_named_node (node, "click-emphasis-sound")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  click_emphasis_sound = prop->value();
            }
      }

      if ((child = find_named_node (node, "solo-model")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  if (prop->value() == "SoloBus")
                        _solo_model = SoloBus;
                  else
                        _solo_model = InverseMute;
            }
      }

      /* BOOLEAN OPTIONS */

      if ((child = find_named_node (node, "auto-play")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  set_auto_play (prop->value() == "yes");
            }
      }
      if ((child = find_named_node (node, "auto-input")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  set_auto_input (prop->value() == "yes");
            }
      }
      if ((child = find_named_node (node, "seamless-loop")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  set_seamless_loop (prop->value() == "yes");
            }
      }
      if ((child = find_named_node (node, "punch-in")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  set_punch_in (prop->value() == "yes");
            }
      }
      if ((child = find_named_node (node, "punch-out")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  set_punch_out (prop->value() == "yes");
            }
      }
      if ((child = find_named_node (node, "auto-return")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  set_auto_return (prop->value() == "yes");
            }
      }
      if ((child = find_named_node (node, "send-mtc")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  set_send_mtc (prop->value() == "yes");
            }
      }
      if ((child = find_named_node (node, "mmc-control")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  set_mmc_control (prop->value() == "yes");
            }
      }
      if ((child = find_named_node (node, "midi-control")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  set_midi_control (prop->value() == "yes");
            }
      }
      if ((child = find_named_node (node, "midi-feedback")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  set_midi_feedback (prop->value() == "yes");
            }
      }
      if ((child = find_named_node (node, "recording-plugins")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  set_recording_plugins (prop->value() == "yes");
            }
      }
      if ((child = find_named_node (node, "crossfades-active")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  set_crossfades_active (prop->value() == "yes");
            }
      }
      if ((child = find_named_node (node, "audible-click")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  set_clicking (prop->value() == "yes");
            }
      }

      if ((child = find_named_node (node, "align-style")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  if (prop->value() == "capture") {
                        set_align_style (CaptureTime);
                  } else {
                        set_align_style (ExistingMaterial);
                  }
            }
      }

      if ((child = find_named_node (node, "layer-model")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  if (prop->value() == X_("LaterHigher")) {
                        set_layer_model (LaterHigher);
                  } else if (prop->value() == X_("AddHigher")) {
                        set_layer_model (AddHigher);
                  } else {
                        set_layer_model (MoveAddHigher);
                  }
            }
      }

      if ((child = find_named_node (node, "xfade-model")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  if (prop->value() == X_("Short")) {
                        set_xfade_model (ShortCrossfade);
                  } else {
                        set_xfade_model (FullCrossfade);
                  }
            }
      }

      if ((child = find_named_node (node, "short-xfade-length")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  /* value is stored as a fractional seconds */
                  float secs = atof (prop->value().c_str());
                  Crossfade::set_short_xfade_length ((jack_nframes_t) floor (secs * frame_rate()));
            } 
      }

      if ((child = find_named_node (node, "full-xfades-unmuted")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  crossfades_active = (prop->value() == "yes");
            }
      } 

      /* TIED OPTIONS */

      if ((child = find_named_node (node, "default-fade-steepness")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  fade_steepness = atof (prop->value().c_str());
                  have_fade_steepness = true;
            }
      }
      if ((child = find_named_node (node, "default-fade-msec")) != 0) {
            if ((prop = child->property ("val")) != 0) {
                  fade_msecs = atof (prop->value().c_str());
                  have_fade_msecs = true;
            }
      }

      if (have_fade_steepness || have_fade_msecs) {
            // set_default_fade (fade_steepness, fade_msecs);
      }

      return 0;
}

XMLNode&
Session::get_options () const
{
      XMLNode* opthead;
      XMLNode* child;
      char buf[32];
      LocaleGuard lg (X_("POSIX"));

      opthead = new XMLNode ("Options");

      SlaveSource src = slave_source ();
      string src_string;
      switch (src) {
      case None:
            src_string = "none";
            break;
      case MTC:
            src_string = "mtc";
            break;
      case JACK:
            src_string = "jack";
            break;
      }
      child = opthead->add_child ("slave");
      child->add_property ("type", src_string);
      
      child = opthead->add_child ("send-midi-timecode");
      child->add_property ("val", send_midi_timecode?"yes":"no");

      child = opthead->add_child ("send-midi-machine-control");
      child->add_property ("val", send_midi_machine_control?"yes":"no");

      snprintf (buf, sizeof(buf)-1, "%x", (int) input_auto_connect);
      child = opthead->add_child ("input-auto-connect");
      child->add_property ("val", buf);

      snprintf (buf, sizeof(buf)-1, "%x", (int) output_auto_connect);
      child = opthead->add_child ("output-auto-connect");
      child->add_property ("val", buf);

      snprintf (buf, sizeof(buf)-1, "%d", max_level);
      child = opthead->add_child ("max-level");
      child->add_property ("val", buf);

      snprintf (buf, sizeof(buf)-1, "%d", min_level);
      child = opthead->add_child ("min-level");
      child->add_property ("val", buf);

      snprintf (buf, sizeof(buf)-1, "%f", _meter_hold);
      child = opthead->add_child ("meter-hold");
      child->add_property ("val", buf);

      snprintf (buf, sizeof(buf)-1, "%f", _meter_falloff);
      child = opthead->add_child ("meter-falloff");
      child->add_property ("val", buf);
      
      snprintf (buf, sizeof(buf)-1, "%u", over_length_long);
      child = opthead->add_child ("long-over-length");
      child->add_property ("val", buf);

      snprintf (buf, sizeof(buf)-1, "%u", over_length_short);
      child = opthead->add_child ("short-over-length");
      child->add_property ("val", buf);

      snprintf (buf, sizeof(buf)-1, "%f", shuttle_speed_factor);
      child = opthead->add_child ("shuttle-speed-factor");
      child->add_property ("val", buf);

      snprintf (buf, sizeof(buf)-1, "%f", shuttle_speed_threshold);
      child = opthead->add_child ("shuttle-speed-threshold");
      child->add_property ("val", buf);

      snprintf (buf, sizeof(buf)-1, "%f", rf_speed);
      child = opthead->add_child ("rf-speed");
      child->add_property ("val", buf);

      snprintf (buf, sizeof(buf)-1, "%.2f", smpte_frames_per_second);
      child = opthead->add_child ("smpte-frames-per-second");
      child->add_property ("val", buf);
      
      child = opthead->add_child ("smpte-drop-frames");
      child->add_property ("val", smpte_drop_frames ? "yes" : "no");
      
      snprintf (buf, sizeof(buf)-1, "%u", smpte_offset ());
      child = opthead->add_child ("smpte-offset");
      child->add_property ("val", buf);
      
      child = opthead->add_child ("smpte-offset-negative");
      child->add_property ("val", smpte_offset_negative () ? "yes" : "no");
      
      child = opthead->add_child ("edit-mode");
      switch (_edit_mode) {
      case Splice:
            child->add_property ("val", "splice");
            break;

      case Slide:
            child->add_property ("val", "slide");
            break;
      }

      child = opthead->add_child ("auto-play");
      child->add_property ("val", get_auto_play () ? "yes" : "no");
      child = opthead->add_child ("auto-input");
      child->add_property ("val", get_auto_input () ? "yes" : "no");
      child = opthead->add_child ("seamless-loop");
      child->add_property ("val", get_seamless_loop () ? "yes" : "no");
      child = opthead->add_child ("punch-in");
      child->add_property ("val", get_punch_in () ? "yes" : "no");
      child = opthead->add_child ("punch-out");
      child->add_property ("val", get_punch_out () ? "yes" : "no");
      child = opthead->add_child ("all-safe");
      child->add_property ("val", get_all_safe () ? "yes" : "no");
      child = opthead->add_child ("auto-return");
      child->add_property ("val", get_auto_return () ? "yes" : "no");
      child = opthead->add_child ("mmc-control");
      child->add_property ("val", get_mmc_control () ? "yes" : "no");
      child = opthead->add_child ("midi-control");
      child->add_property ("val", get_midi_control () ? "yes" : "no");
      child = opthead->add_child ("midi-feedback");
      child->add_property ("val", get_midi_feedback () ? "yes" : "no");
      child = opthead->add_child ("recording-plugins");
      child->add_property ("val", get_recording_plugins () ? "yes" : "no");
      child = opthead->add_child ("auto-crossfade");
      child->add_property ("val", get_crossfades_active () ? "yes" : "no");
      child = opthead->add_child ("audible-click");
      child->add_property ("val", get_clicking () ? "yes" : "no");

      if (click_sound.length()) {
            child = opthead->add_child ("click-sound");
            child->add_property ("val", click_sound);
      }

      if (click_emphasis_sound.length()) {
            child = opthead->add_child ("click-emphasis-sound");
            child->add_property ("val", click_emphasis_sound);
      }

      child = opthead->add_child ("solo-model");
      child->add_property ("val", _solo_model == SoloBus ? "SoloBus" : "InverseMute");

      child = opthead->add_child ("align-style");
      child->add_property ("val", (align_style == ExistingMaterial ? "existing" : "capture"));

      child = opthead->add_child ("layer-model");
      switch (layer_model) {
      case LaterHigher:
            child->add_property ("val", X_("LaterHigher"));
            break;
      case MoveAddHigher:
            child->add_property ("val", X_("MoveAddHigher"));
            break;
      case AddHigher:
            child->add_property ("val", X_("AddHigher"));
            break;
      }

      child = opthead->add_child ("xfade-model");
      switch (xfade_model) {
      case FullCrossfade:
            child->add_property ("val", X_("Full"));
            break;
      case ShortCrossfade:
            child->add_property ("val", X_("Short"));
      }

      child = opthead->add_child ("short-xfade-length");
      /* store as fractions of a second */
      snprintf (buf, sizeof(buf)-1, "%f", 
              (float) Crossfade::short_xfade_length() / frame_rate());
      child->add_property ("val", buf);

      child = opthead->add_child ("full-xfades-unmuted");
      child->add_property ("val", crossfades_active ? "yes" : "no");

      return *opthead;
}

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

XMLNode&
Session::get_template()
{
      /* if we don't disable rec-enable, diskstreams
         will believe they need to store their capture
         sources in their state node. 
      */
      
      disable_record ();

      cerr << "STart get template\n";
      return state(false);
}

XMLNode&
Session::state(bool full_state)
{
      XMLNode* node = new XMLNode("Session");
      XMLNode* child;

      // store libardour version, just in case
      char buf[16];
      snprintf(buf, sizeof(buf)-1, "%d.%d.%d", 
             libardour_major_version, libardour_minor_version, libardour_micro_version);
      node->add_property("version", string(buf));
            
      /* store configuration settings */

      if (full_state) {
      
            /* store the name */
            node->add_property ("name", _name);

            if (session_dirs.size() > 1) {

                  string p;

                  vector<space_and_path>::iterator i = session_dirs.begin();
                  vector<space_and_path>::iterator next;

                  ++i; /* skip the first one */
                  next = i;
                  ++next;

                  while (i != session_dirs.end()) {

                        p += (*i).path;

                        if (next != session_dirs.end()) {
                              p += ':';
                        } else {
                              break;
                        }

                        ++next;
                        ++i;
                  }
                  
                  child = node->add_child ("Path");
                  child->add_content (p);
            }
      }

      node->add_child_nocopy (get_options());

      child = node->add_child ("Sources");

      if (full_state) {
            LockMonitor sl (source_lock, __LINE__, __FILE__);

            for (SourceList::iterator siter = sources.begin(); siter != sources.end(); ++siter) {
                  
                  /* Don't save information about FileSources that are empty */
                  
                  FileSource* fs;
                  
                  if ((fs = dynamic_cast<FileSource*> ((*siter).second)) != 0) {
                        if (fs->length() == 0) {
                              continue;
                        }
                  }
                  
                  child->add_child_nocopy ((*siter).second->get_state());
            }
      }

      child = node->add_child ("Regions");

      if (full_state) { 
            LockMonitor rl (region_lock, __LINE__, __FILE__);

            for (AudioRegionList::const_iterator i = audio_regions.begin(); i != audio_regions.end(); ++i) {
                  
                  /* only store regions not attached to playlists */

                  if ((*i).second->playlist() == 0) {
                        child->add_child_nocopy (i->second->state (true));
                  }
            }
      }

      child = node->add_child ("DiskStreams");

      { 
            RWLockMonitor dl (diskstream_lock, false, __LINE__, __FILE__);
            for (DiskStreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
                  if (!(*i)->hidden()) {
                        child->add_child_nocopy ((*i)->get_state());
                  }
            }
      }

      node->add_child_nocopy (_locations.get_state());
      
      child = node->add_child ("Connections");
      {
            LockMonitor lm (connection_lock, __LINE__, __FILE__);
            for (ConnectionList::iterator i = _connections.begin(); i != _connections.end(); ++i) {
                  if (!(*i)->system_dependent()) {
                        child->add_child_nocopy ((*i)->get_state());
                  }
            }
      }

      child = node->add_child ("Routes");
      {
            RWLockMonitor lm (route_lock, false, __LINE__, __FILE__);
            
            RoutePublicOrderSorter cmp;
            RouteList public_order(routes);
            public_order.sort (cmp);
            
            for (RouteList::iterator i = public_order.begin(); i != public_order.end(); ++i) {
                  if (!(*i)->hidden()) {
                        if (full_state) {
                              child->add_child_nocopy ((*i)->get_state());
                        } else {
                              child->add_child_nocopy ((*i)->get_template());
                        }
                  }
            }
      }

      
      child = node->add_child ("EditGroups");
      for (list<RouteGroup *>::iterator i = edit_groups.begin(); i != edit_groups.end(); ++i) {
            child->add_child_nocopy ((*i)->get_state());
      }

      child = node->add_child ("MixGroups");
      for (list<RouteGroup *>::iterator i = mix_groups.begin(); i != mix_groups.end(); ++i) {
            child->add_child_nocopy ((*i)->get_state());
      }

      child = node->add_child ("Playlists");
      for (PlaylistList::iterator i = playlists.begin(); i != playlists.end(); ++i) {
            if (!(*i)->hidden()) {
                  if (!(*i)->empty()) {
                        if (full_state) {
                              child->add_child_nocopy ((*i)->get_state());
                        } else {
                              child->add_child_nocopy ((*i)->get_template());
                        }
                  }
            }
      }

      child = node->add_child ("UnusedPlaylists");
      for (PlaylistList::iterator i = unused_playlists.begin(); i != unused_playlists.end(); ++i) {
            if (!(*i)->hidden()) {
                  if (!(*i)->empty()) {
                        if (full_state) {
                              child->add_child_nocopy ((*i)->get_state());
                        } else {
                              child->add_child_nocopy ((*i)->get_template());
                        }
                  }
            }
      }
      
      
      if (_click_io) {
            child = node->add_child ("Click");
            child->add_child_nocopy (_click_io->state (full_state));
      }

      if (full_state) {
            child = node->add_child ("NamedSelections");
            for (NamedSelectionList::iterator i = named_selections.begin(); i != named_selections.end(); ++i) {
                  if (full_state) {
                        child->add_child_nocopy ((*i)->get_state());
                  } 
            }
      }

      node->add_child_nocopy (_tempo_map->get_state());

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

      return *node;
}

int
Session::set_state (const XMLNode& node)
{
      XMLNodeList nlist;
      XMLNode* child;
      const XMLProperty* prop;

      _state_of_the_state = StateOfTheState (_state_of_the_state|CannotSave);
      
      if (node.name() != "Session"){
            fatal << _("programming error: Session: incorrect XML node sent to set_state()") << endmsg;
            return -1;
      }

      if ((prop = node.property ("name")) != 0) {
            _name = prop->value ();
      }
      
      IO::disable_ports ();
      IO::disable_connecting ();

      /* Object loading order:

      MIDI
      Path
      extra
      Options
      Sources
      AudioRegions
      DiskStreams
      Connections
      Locations
      Routes
      EditGroups
      MixGroups
      Click
      */

      if (use_config_midi_ports ()) {
            return -1;
      }

      if ((child = find_named_node (node, "Path")) != 0) {
            /* XXX this XML content stuff horrible API design */
            string raid_path = _path + ':' + child->children().front()->content();
            setup_raid_path (raid_path);
      } else {
            /* the path is already set */
      }

      if ((child = find_named_node (node, "extra")) != 0) {
            _extra_xml = new XMLNode (*child);
      }

      if ((child = find_named_node (node, "Options")) == 0) {
            error << _("Session: XML state has no options section") << endmsg;
            return -1;
      } else if (load_options (*child)) {
            return -1;
      }

      if ((child = find_named_node (node, "Sources")) == 0) {
            error << _("Session: XML state has no sources section") << endmsg;
            return -1;
      } else if (load_sources (*child)) {
            return -1;
      }

      if ((child = find_named_node (node, "Regions")) == 0) {
            error << _("Session: XML state has no Regions section") << endmsg;
            return -1;
      } else if (load_regions (*child)) {
            return -1;
      }

      if ((child = find_named_node (node, "Playlists")) == 0) {
            error << _("Session: XML state has no playlists section") << endmsg;
            return -1;
      } else if (load_playlists (*child)) {
            return -1;
      }

      if ((child = find_named_node (node, "UnusedPlaylists")) == 0) {
            // this is OK
      } else if (load_unused_playlists (*child)) {
            return -1;
      }
      
      if ((child = find_named_node (node, "NamedSelections")) != 0) {
            if (load_named_selections (*child)) {
                  return -1;
            }
      }

      if ((child = find_named_node (node, "DiskStreams")) == 0) {
            error << _("Session: XML state has no diskstreams section") << endmsg;
            return -1;
      } else if (load_diskstreams (*child)) {
            return -1;
      }

      if ((child = find_named_node (node, "Connections")) == 0) {
            error << _("Session: XML state has no connections section") << endmsg;
            return -1;
      } else if (load_connections (*child)) {
            return -1;
      }

      if ((child = find_named_node (node, "Locations")) == 0) {
            error << _("Session: XML state has no locations section") << endmsg;
            return -1;
      } else if (_locations.set_state (*child)) {
            return -1;
      }

      Location* location;

      if ((location = _locations.auto_loop_location()) != 0) {
            set_auto_loop_location (location);
      }

      if ((location = _locations.auto_punch_location()) != 0) {
            set_auto_punch_location (location);
      }

      if ((location = _locations.end_location()) == 0) {
            _locations.add (end_location);
      } else {
            end_location = location;
      }

      _locations.save_state (_("initial state"));

      if ((child = find_named_node (node, "EditGroups")) == 0) {
            error << _("Session: XML state has no edit groups section") << endmsg;
            return -1;
      } else if (load_edit_groups (*child)) {
            return -1;
      }

      if ((child = find_named_node (node, "MixGroups")) == 0) {
            error << _("Session: XML state has no mix groups section") << endmsg;
            return -1;
      } else if (load_mix_groups (*child)) {
            return -1;
      }

      if ((child = find_named_node (node, "TempoMap")) == 0) {
            error << _("Session: XML state has no Tempo Map section") << endmsg;
            return -1;
      } else if (_tempo_map->set_state (*child)) {
            return -1;
      }

      if ((child = find_named_node (node, "Routes")) == 0) {
            error << _("Session: XML state has no routes section") << endmsg;
            return -1;
      } else if (load_routes (*child)) {
            return -1;
      }

      if ((child = find_named_node (node, "Click")) == 0) {
            warning << _("Session: XML state has no click section") << endmsg;
      } else if (_click_io) {
            _click_io->set_state (*child);
      }
      
      /* OK, now we can set edit mode */

      set_edit_mode (pending_edit_mode);

      /* here beginneth the second phase ... */

      StateReady (); /* EMIT SIGNAL */

      _state_of_the_state = Clean;

      if (state_was_pending) {
            save_state (_current_snapshot_name);
            remove_pending_capture_state ();
            state_was_pending = false;
      }

      return 0;
}

int
Session::load_routes (const XMLNode& node)
{
      XMLNodeList nlist;
      XMLNodeConstIterator niter;
      Route *route;

      nlist = node.children();

      set_dirty();

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

            if ((route = XMLRouteFactory (**niter)) == 0) {
                  error << _("Session: cannot create Route from XML description.")                    << endmsg;
                  return -1;
            }

            add_route (route);
      }

      return 0;
}

Route *
Session::XMLRouteFactory (const XMLNode& node)
{
      if (node.name() != "Route") {
            return 0;
      }

      if (node.property ("diskstream") != 0 || node.property ("diskstream-id") != 0) {
            return new AudioTrack (*this, node);
      } else {
            return new Route (*this, node);
      }
}

int
Session::load_regions (const XMLNode& node)
{
      XMLNodeList nlist;
      XMLNodeConstIterator niter;
      AudioRegion* region;

      nlist = node.children();

      set_dirty();

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

            if ((region = XMLRegionFactory (**niter, false)) == 0) {
                  error << _("Session: cannot create Region from XML description.") << endmsg;
            }
      }

      return 0;
}

AudioRegion *
Session::XMLRegionFactory (const XMLNode& node, bool full)
{
      const XMLProperty* prop;
      id_t s_id;
      Source* source;
      AudioRegion::SourceList sources;
      uint32_t nchans = 1;
      char buf[128];
      
      if (node.name() != X_("Region")) {
            return 0;
      }

      if ((prop = node.property (X_("channels"))) != 0) {
            nchans = atoi (prop->value().c_str());
      }

      
      if ((prop = node.property (X_("source-0"))) == 0) {
            if ((prop = node.property ("source")) == 0) {
                  error << _("Session: XMLNode describing a AudioRegion is incomplete (no source)") << endmsg;
                  return 0;
            }
      }

      sscanf (prop->value().c_str(), "%llu", &s_id);

      if ((source = get_source (s_id)) == 0) {
            error << compose(_("Session: XMLNode describing a AudioRegion references an unknown source id =%1"), s_id) << endmsg;
            return 0;
      }

      sources.push_back(source);

      /* pickup other channels */

      for (uint32_t n=1; n < nchans; ++n) {
            snprintf (buf, sizeof(buf), X_("source-%d"), n);
            if ((prop = node.property (buf)) != 0) {
                  sscanf (prop->value().c_str(), "%llu", &s_id);
                  
                  if ((source = get_source (s_id)) == 0) {
                        error << compose(_("Session: XMLNode describing a AudioRegion references an unknown source id =%1"), s_id) << endmsg;
                        return 0;
                  }
                  sources.push_back(source);
            }
      }
      
      
      try {
            return new AudioRegion (sources, node);
      }

      catch (failed_constructor& err) {
            return 0;
      }
}

XMLNode&
Session::get_sources_as_xml ()

{
      XMLNode* node = new XMLNode (X_("Sources"));
      LockMonitor lm (source_lock, __LINE__, __FILE__);

      for (SourceList::iterator i = sources.begin(); i != sources.end(); ++i) {
            node->add_child_nocopy ((*i).second->get_state());
      }

      return *node;
}

string
Session::path_from_region_name (string name, string identifier)
{
      char buf[PATH_MAX+1];
      uint32_t n;
      string dir = discover_best_sound_dir ();

      for (n = 0; n < 999999; ++n) {
            if (identifier.length()) {
                  snprintf (buf, sizeof(buf), "%s/%s%s%" PRIu32 ".wav", dir.c_str(), name.c_str(), 
                          identifier.c_str(), n);
            } else {
                  snprintf (buf, sizeof(buf), "%s/%s-%" PRIu32 ".wav", dir.c_str(), name.c_str(), n);
            }
            if (access (buf, F_OK) != 0) {
                  return buf;
            }
      }

      return "";
}
      

int
Session::load_sources (const XMLNode& node)
{
      XMLNodeList nlist;
      XMLNodeConstIterator niter;
      Source* source;

      nlist = node.children();

      set_dirty();

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

            if ((source = XMLSourceFactory (**niter)) == 0) {
                  error << _("Session: cannot create Source from XML description.") << endmsg;
            }
      }

      return 0;
}

Source *
Session::XMLSourceFactory (const XMLNode& node)
{
      Source *src;

      if (node.name() != "Source") {
            return 0;
      }

      try {
            src = new FileSource (node, frame_rate());
      }
      
      catch (failed_constructor& err) {

            try {
                  src = new SndFileSource (node);
            }

            catch (failed_constructor& err) {
                  error << _("Found a sound file that cannot be used by Ardour. See the progammers.") << endmsg;
                  return 0;
            } 
      }

      return src;
}

int
Session::save_template (string template_name)
{
      XMLTree tree;
      string xml_path, bak_path, template_path;

      if (_state_of_the_state & CannotSave) {
            return -1;
      }

      DIR* dp;
      string dir = template_dir();

      if ((dp = opendir (dir.c_str()))) {
            closedir (dp);
      } else {
            if (mkdir (dir.c_str(), S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH)<0) {
                  error << compose(_("Could not create mix templates directory \"%1\" (%2)"), dir, strerror (errno)) << endmsg;
                  return -1;
            }
      }

      tree.set_root (&get_template());

      xml_path = dir;
      xml_path += template_name;
      xml_path += _template_suffix;

      ifstream in(xml_path.c_str());
      
      if (in) {
            warning << compose(_("Template \"%1\" already exists - new version not created"), template_name) << endmsg;
            return -1;
      } else {
            in.close();
      }

      if (!tree.write (xml_path)) {
            error << _("mix template not saved") << endmsg;
            return -1;
      }

      return 0;
}

int
Session::rename_template (string old_name, string new_name) 
{
      string old_path = template_dir() + old_name + _template_suffix;
      string new_path = template_dir() + new_name + _template_suffix;

      return rename (old_path.c_str(), new_path.c_str());
}

int
Session::delete_template (string name) 
{
      string template_path = template_dir();
      template_path += name;
      template_path += _template_suffix;

      return remove (template_path.c_str());
}

void
Session::refresh_disk_space ()
{
#if HAVE_SYS_VFS_H
      struct statfs statfsbuf;
      vector<space_and_path>::iterator i;
      LockMonitor lm (space_lock, __LINE__, __FILE__);
      double scale;

      /* get freespace on every FS that is part of the session path */

      _total_free_4k_blocks = 0;
      
      for (i = session_dirs.begin(); i != session_dirs.end(); ++i) {
            statfs ((*i).path.c_str(), &statfsbuf);

            scale = statfsbuf.f_bsize/4096.0;

            (*i).blocks = (uint32_t) floor (statfsbuf.f_bavail * scale);
            _total_free_4k_blocks += (*i).blocks;
      }
#endif
}

int
Session::ensure_sound_dir (string path, string& result)
{
      string dead;
      string peak;

      /* Ensure that the parent directory exists */
      
      if (mkdir (path.c_str(), 0775)) {
            if (errno != EEXIST) {
                  error << compose(_("cannot create session directory \"%1\"; ignored"), path) << endmsg;
                  return -1;
            }
      }
      
      /* Ensure that the sounds directory exists */
      
      result = path;
      result += '/';
      result += sound_dir_name;
      
      if (mkdir (result.c_str(), 0775)) {
            if (errno != EEXIST) {
                  error << compose(_("cannot create sounds directory \"%1\"; ignored"), result) << endmsg;
                  return -1;
            }
      }

      dead = path;
      dead += '/';
      dead += dead_sound_dir_name;
      
      if (mkdir (dead.c_str(), 0775)) {
            if (errno != EEXIST) {
                  error << compose(_("cannot create dead sounds directory \"%1\"; ignored"), dead) << endmsg;
                  return -1;
            }
      }

      peak = path;
      peak += '/';
      peak += peak_dir_name;
      
      if (mkdir (peak.c_str(), 0775)) {
            if (errno != EEXIST) {
                  error << compose(_("cannot create peak file directory \"%1\"; ignored"), peak) << endmsg;
                  return -1;
            }
      }
      
      /* callers expect this to be terminated ... */
                  
      result += '/';
      return 0;
}     

string
Session::discover_best_sound_dir ()
{
      vector<space_and_path>::iterator i;
      string result;

      /* handle common case without system calls */

      if (session_dirs.size() == 1) {
            return sound_dir();
      }

      /* OK, here's the algorithm we're following here:

      We want to select which directory to use for 
      the next file source to be created. Ideally,
      we'd like to use a round-robin process so as to
      get maximum performance benefits from splitting
      the files across multiple disks.

      However, in situations without much diskspace, an
      RR approach may end up filling up a filesystem
      with new files while others still have space.
      Its therefore important to pay some attention to
      the freespace in the filesystem holding each
      directory as well. However, if we did that by
      itself, we'd keep creating new files in the file
      system with the most space until it was as full
      as all others, thus negating any performance
      benefits of this RAID-1 like approach.

      So, we use a user-configurable space threshold. If
      there are at least 2 filesystems with more than this
      much space available, we use RR selection between them. 
      If not, then we pick the filesystem with the most space.

      This gets a good balance between the two
      approaches.  
      */
      
      refresh_disk_space ();
      
      int free_enough = 0;

      for (i = session_dirs.begin(); i != session_dirs.end(); ++i) {
            if ((*i).blocks * 4096 >= Config->get_disk_choice_space_threshold()) {
                  free_enough++;
            }
      }

      if (free_enough >= 2) {

            bool found_it = false;

            /* use RR selection process, ensuring that the one
               picked works OK.
            */

            i = last_rr_session_dir;

            do {
                  if (++i == session_dirs.end()) {
                        i = session_dirs.begin();
                  }

                  if ((*i).blocks * 4096 >= Config->get_disk_choice_space_threshold()) {
                        if (ensure_sound_dir ((*i).path, result) == 0) {
                              last_rr_session_dir = i;
                              found_it = true;
                              break;
                        }
                  }

            } while (i != last_rr_session_dir);

            if (!found_it) {
                  result = sound_dir();
            }

      } else {

            /* pick FS with the most freespace (and that
               seems to actually work ...)
            */
            
            vector<space_and_path> sorted;
            space_and_path_ascending_cmp cmp;

            sorted = session_dirs;
            sort (sorted.begin(), sorted.end(), cmp);
            
            for (i = sorted.begin(); i != sorted.end(); ++i) {
                  if (ensure_sound_dir ((*i).path, result) == 0) {
                        last_rr_session_dir = i;
                        break;
                  }
            }
            
            /* if the above fails, fall back to the most simplistic solution */
            
            if (i == sorted.end()) {
                  return sound_dir();
            } 
      }

      return result;
}

int
Session::load_playlists (const XMLNode& node)
{
      XMLNodeList nlist;
      XMLNodeConstIterator niter;
      Playlist *playlist;

      nlist = node.children();

      set_dirty();

      for (niter = nlist.begin(); niter != nlist.end(); ++niter) {
            
            if ((playlist = XMLPlaylistFactory (**niter)) == 0) {
                  error << _("Session: cannot create Playlist from XML description.") << endmsg;
            }
      }

      return 0;
}

int
Session::load_unused_playlists (const XMLNode& node)
{
      XMLNodeList nlist;
      XMLNodeConstIterator niter;
      Playlist *playlist;

      nlist = node.children();

      set_dirty();

      for (niter = nlist.begin(); niter != nlist.end(); ++niter) {
            
            if ((playlist = XMLPlaylistFactory (**niter)) == 0) {
                  error << _("Session: cannot create Playlist from XML description.") << endmsg;
                  continue;
            }

            // now manually untrack it

            track_playlist (playlist, false);
      }

      return 0;
}


Playlist *
Session::XMLPlaylistFactory (const XMLNode& node)
{
      try {
            return new AudioPlaylist (*this, node);
      }

      catch (failed_constructor& err) {
            return 0;
      }
}

int
Session::load_named_selections (const XMLNode& node)
{
      XMLNodeList nlist;
      XMLNodeConstIterator niter;
      NamedSelection *ns;

      nlist = node.children();

      set_dirty();

      for (niter = nlist.begin(); niter != nlist.end(); ++niter) {
            
            if ((ns = XMLNamedSelectionFactory (**niter)) == 0) {
                  error << _("Session: cannot create Named Selection from XML description.") << endmsg;
            }
      }

      return 0;
}

NamedSelection *
Session::XMLNamedSelectionFactory (const XMLNode& node)
{
      try {
            return new NamedSelection (*this, node);
      }

      catch (failed_constructor& err) {
            return 0;
      }
}

string
Session::dead_sound_dir () const
{
      string res = _path;
      res += dead_sound_dir_name;
      res += '/';
      return res;
}

string
Session::sound_dir () const
{
      string res = _path;
      res += sound_dir_name;
      res += '/';
      return res;
}

string
Session::peak_dir () const
{
      string res = _path;
      res += peak_dir_name;
      res += '/';
      return res;
}
      
string
Session::automation_dir () const
{
      string res = _path;
      res += "automation/";
      return res;
}

string
Session::template_dir ()
{
      string path = Config->get_user_ardour_path();
      path += "templates/";

      return path;
}

string
Session::template_path ()
{
      string path;

      path += Config->get_user_ardour_path();
      if (path[path.length()-1] != ':') {
            path += ':';
      }
      path += Config->get_system_ardour_path();

      vector<string> split_path;
      
      split (path, split_path, ':');
      path = "";

      for (vector<string>::iterator i = split_path.begin(); i != split_path.end(); ++i) {
            path += *i;
            path += "templates/";
            
            if (distance (i, split_path.end()) != 1) {
                  path += ':';
            }
      }
            
      return path;
}

int
Session::load_connections (const XMLNode& node)
{
      XMLNodeList nlist = node.children();
      XMLNodeConstIterator niter;

      set_dirty();

      for (niter = nlist.begin(); niter != nlist.end(); ++niter) {
            if ((*niter)->name() == "InputConnection") {
                  add_connection (new ARDOUR::InputConnection (**niter));
            } else if ((*niter)->name() == "OutputConnection") {
                  add_connection (new ARDOUR::OutputConnection (**niter));
            } else {
                  error << compose(_("Unknown node \"%1\" found in Connections list from state file"), (*niter)->name()) << endmsg;
                  return -1;
            }
      }

      return 0;
}                       

int
Session::load_edit_groups (const XMLNode& node)
{
      return load_route_groups (node, true);
}

int
Session::load_mix_groups (const XMLNode& node)
{
      return load_route_groups (node, false);
}

int
Session::load_route_groups (const XMLNode& node, bool edit)
{
      XMLNodeList nlist = node.children();
      XMLNodeConstIterator niter;
      RouteGroup* route;

      set_dirty();

      for (niter = nlist.begin(); niter != nlist.end(); ++niter) {
            if ((*niter)->name() == "RouteGroup") {
                  if (edit) {
                        route = add_edit_group ("");
                        route->set_state (**niter);
                  } else {
                        route = add_mix_group ("");
                        route->set_state (**niter);
                  }
            }
      }
      
      return 0;
}                       

void
Session::swap_configuration(Configuration** new_config)
{
      RWLockMonitor lm (route_lock, true, __LINE__, __FILE__); // jlc - WHY?
      Configuration* tmp = *new_config;
      *new_config = Config;
      Config = tmp;
      set_dirty();
}

void
Session::copy_configuration(Configuration* new_config)
{
      RWLockMonitor lm (route_lock, true, __LINE__, __FILE__);
      new_config = new Configuration(*Config);
}

static bool
state_file_filter (const string &str, void *arg)
{
      return (str.length() > strlen(Session::statefile_suffix()) &&
            str.find (Session::statefile_suffix()) == (str.length() - strlen (Session::statefile_suffix())));
}

struct string_cmp {
      bool operator()(const string* a, const string* b) {
            return *a < *b;
      }
};

static string*
remove_end(string* state)
{
      string statename(*state);
      
      string::size_type start,end;
      if ((start = statename.find_last_of ('/')) != string::npos) {
            statename = statename.substr (start+1);
      }
            
      if ((end = statename.rfind(".ardour")) < 0) {
            end = statename.length();
      }

      return new string(statename.substr (0, end));
}

vector<string *> *
Session::possible_states (string path) 
{
      PathScanner scanner;
      vector<string*>* states = scanner (path, state_file_filter, 0, false, false);
      
      transform(states->begin(), states->end(), states->begin(), remove_end);
      
      string_cmp cmp;
      sort (states->begin(), states->end(), cmp);
      
      return states;
}

vector<string *> *
Session::possible_states () const
{
      return possible_states(_path);
}

void
Session::auto_save()
{
      save_state (_current_snapshot_name);
}

RouteGroup *
Session::add_edit_group (string name)
{
      RouteGroup* rg = new RouteGroup (name);
      edit_groups.push_back (rg);
      edit_group_added (rg); /* EMIT SIGNAL */
      set_dirty();
      return rg;
}

RouteGroup *
Session::add_mix_group (string name)
{
      RouteGroup* rg = new RouteGroup (name, RouteGroup::Relative);
      mix_groups.push_back (rg);
      mix_group_added (rg); /* EMIT SIGNAL */
      set_dirty();
      return rg;
}

RouteGroup *
Session::mix_group_by_name (string name)
{
      list<RouteGroup *>::iterator i;

      for (i = mix_groups.begin(); i != mix_groups.end(); ++i) {
            if ((*i)->name() == name) {
                  return* i;
            }
      }
      return 0;
}

RouteGroup *
Session::edit_group_by_name (string name)
{
      list<RouteGroup *>::iterator i;

      for (i = edit_groups.begin(); i != edit_groups.end(); ++i) {
            if ((*i)->name() == name) {
                  return* i;
            }
      }
      return 0;
}

void
Session::set_meter_hold (float val)
{
      _meter_hold = val;
      MeterHoldChanged(); // emit
}

void
Session::set_meter_falloff (float val)
{
      _meter_falloff = val;
      MeterFalloffChanged(); // emit
}


void
Session::begin_reversible_command (string name, UndoAction* private_undo)
{
      current_cmd.clear ();
      current_cmd.set_name (name);

      if (private_undo) {
            current_cmd.add_undo (*private_undo);
      }
}

void
Session::commit_reversible_command (UndoAction* private_redo)
{
      struct timeval now;

      if (private_redo) {
            current_cmd.add_redo_no_execute (*private_redo);
      }

      gettimeofday (&now, 0);
      current_cmd.set_timestamp (now);

      history.add (current_cmd);
}

Session::GlobalRouteBooleanState 
Session::get_global_route_boolean (bool (Route::*method)(void) const)
{
      GlobalRouteBooleanState s;
      RWLockMonitor lm (route_lock, false, __LINE__, __FILE__);

      for (RouteList::iterator i = routes.begin(); i != routes.end(); ++i) {
            if (!(*i)->hidden()) {
                  RouteBooleanState v;
                  
                  v.first =* i;
                  v.second = ((*i)->*method)();
                  
                  s.push_back (v);
            }
      }

      return s;
}

Session::GlobalRouteMeterState
Session::get_global_route_metering ()
{
      GlobalRouteMeterState s;
      RWLockMonitor lm (route_lock, false, __LINE__, __FILE__);

      for (RouteList::iterator i = routes.begin(); i != routes.end(); ++i) {
            if (!(*i)->hidden()) {
                  RouteMeterState v;
                  
                  v.first =* i;
                  v.second = (*i)->meter_point();
                  
                  s.push_back (v);
            }
      }

      return s;
}

void
Session::set_global_route_metering (GlobalRouteMeterState s, void* arg) 
{
      for (GlobalRouteMeterState::iterator i = s.begin(); i != s.end(); ++i) {
            i->first->set_meter_point (i->second, arg);
      }
}

void
Session::set_global_route_boolean (GlobalRouteBooleanState s, void (Route::*method)(bool, void*), void* arg)
{
      for (GlobalRouteBooleanState::iterator i = s.begin(); i != s.end(); ++i) {
            (i->first->*method) (i->second, arg);
      }
}

void
Session::set_global_mute (GlobalRouteBooleanState s, void* src)
{
      set_global_route_boolean (s, &Route::set_mute, src);
}

void
Session::set_global_solo (GlobalRouteBooleanState s, void* src)
{
      set_global_route_boolean (s, &Route::set_solo, src);
}

void
Session::set_global_record_enable (GlobalRouteBooleanState s, void* src)
{
      set_global_route_boolean (s, &Route::set_record_enable, src);
}

UndoAction
Session::global_mute_memento (void* src)
{
      return bind (slot (*this, &Session::set_global_mute), get_global_route_boolean (&Route::muted), src);
}

UndoAction
Session::global_metering_memento (void* src)
{
      return bind (slot (*this, &Session::set_global_route_metering), get_global_route_metering (), src);
}

UndoAction
Session::global_solo_memento (void* src)
{
      return bind (slot (*this, &Session::set_global_solo), get_global_route_boolean (&Route::soloed), src);
}

UndoAction
Session::global_record_enable_memento (void* src)
{
      return bind (slot (*this, &Session::set_global_record_enable), get_global_route_boolean (&Route::record_enabled), src);
}

static bool
template_filter (const string &str, void *arg)
{
      return (str.length() > strlen(Session::template_suffix()) &&
            str.find (Session::template_suffix()) == (str.length() - strlen (Session::template_suffix())));
}

void
Session::get_template_list (list<string> &template_names)
{
      vector<string *> *templates;
      PathScanner scanner;
      string path;

      path = template_path ();

      templates = scanner (path, template_filter, 0, false, true);
      
      vector<string*>::iterator i;
      for (i = templates->begin(); i != templates->end(); ++i) {
            string fullpath = *(*i);
            int start, end;

            start = fullpath.find_last_of ('/') + 1;
            if ((end = fullpath.find_last_of ('.')) <0) {
                  end = fullpath.length();
            }
            
            template_names.push_back(fullpath.substr(start, (end-start)));
      }
}

int
Session::read_favorite_dirs (FavoriteDirs & favs)
{
      string path = Config->get_user_ardour_path();
      path += "/favorite_dirs";

      ifstream fav (path.c_str());

      favs.clear();
      
      if (!fav) {
            if (errno != ENOENT) {
                  //error << compose (_("cannot open favorite file %1 (%2)"), path, strerror (errno)) << endmsg;
                  return -1;
            } else {
                  return 1;
            }
      }

      while (true) {

              string newfav;

            getline(fav, newfav);

            if (!fav.good()) {
                  break;
            }

            favs.push_back (newfav);
      }

      return 0;
}

int
Session::write_favorite_dirs (FavoriteDirs & favs)
{
      string path = Config->get_user_ardour_path();
      path += "/favorite_dirs";

      ofstream fav (path.c_str());

      if (!fav) {
            return -1;
      }

      for (FavoriteDirs::iterator i = favs.begin(); i != favs.end(); ++i) {
            fav << (*i) << endl;
      }
      
      return 0;
}

static bool
accept_all_non_peak_files (const string& path, void *arg)
{
      return (path.length() > 5 && path.find (".peak") != (path.length() - 5));
}

static bool
accept_all_state_files (const string& path, void *arg)
{
      return (path.length() > 7 && path.find (".ardour") == (path.length() - 7));
}

int 
Session::find_all_sources (string path, set<string>& result)
{
      XMLTree tree;
      XMLNode* node;

      if (!tree.read (path)) {
            return -1;
      }

      if ((node = find_named_node (*tree.root(), "Sources")) == 0) {
            return -2;
      }

      XMLNodeList nlist;
      XMLNodeConstIterator niter;

      nlist = node->children();

      set_dirty();

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

            if ((prop = (*niter)->property (X_("name"))) == 0) {
                  continue;
            }

            if (prop->value()[0] == '/') {
                  /* external file, ignore */
                  continue;
            }

            string path = _path; /* /-terminated */
            path += sound_dir_name;
            path += '/';
            path += prop->value();

            result.insert (path);
      }

      return 0;
}

int
Session::find_all_sources_across_snapshots (set<string>& result, bool exclude_this_snapshot)
{
      PathScanner scanner;
      vector<string*>* state_files;
      string ripped;
      string this_snapshot_path;

      result.clear ();

      ripped = _path;

      if (ripped[ripped.length()-1] == '/') {
            ripped = ripped.substr (0, ripped.length() - 1);
      }

      state_files = scanner (ripped, accept_all_state_files, (void *) 0, false, true);
      
      if (state_files == 0) {
            /* impossible! */
            return 0;
      }

      this_snapshot_path = _path;
      this_snapshot_path += _current_snapshot_name;
      this_snapshot_path += _statefile_suffix;

      for (vector<string*>::iterator i = state_files->begin(); i != state_files->end(); ++i) {

            if (exclude_this_snapshot && **i == this_snapshot_path) {
                  continue;
            }

            if (find_all_sources (**i, result) < 0) {
                  return -1;
            }
      }

      return 0;
}

int
Session::cleanup_sources (Session::cleanup_report& rep)
{
      vector<Source*> dead_sources;
      vector<Playlist*> playlists_tbd;
      PathScanner scanner;
      string sound_path;
      vector<space_and_path>::iterator i;
      vector<space_and_path>::iterator nexti;
      vector<string*>* soundfiles;
      vector<string> unused;
      set<string> all_sources;
      bool used;
      string spath;
      int ret = -1;
            
      _state_of_the_state = (StateOfTheState) (_state_of_the_state | InCleanup);
      
      /* step 1: consider deleting all unused playlists */

      for (PlaylistList::iterator x = unused_playlists.begin(); x != unused_playlists.end(); ++x) {
            int status;

            status = AskAboutPlaylistDeletion (*x);

            switch (status) {
            case -1:
                  ret = 0;
                  goto out;
                  break;

            case 0:
                  playlists_tbd.push_back (*x);
                  break;

            default:
                  /* leave it alone */
                  break;
            }
      }

      /* now delete any that were marked for deletion */

      for (vector<Playlist*>::iterator x = playlists_tbd.begin(); x != playlists_tbd.end(); ++x) {
            PlaylistList::iterator foo;

            if ((foo = unused_playlists.find (*x)) != unused_playlists.end()) {
                  unused_playlists.erase (foo);
            }
            delete *x;
      }

      /* step 2: clear the undo/redo history for all playlists */

      for (PlaylistList::iterator x = playlists.begin(); x != playlists.end(); ++x) {
            (*x)->drop_all_states ();
      }

      /* step 3: find all un-referenced sources */

      rep.paths.clear ();
      rep.space = 0;

      for (SourceList::iterator i = sources.begin(); i != sources.end(); ) {

            SourceList::iterator tmp;

            tmp = i;
            ++tmp;

            /* only remove files that are not in use and have some size
               to them. otherwise we remove the current "nascent"
               capture files.
            */

            if ((*i).second->use_cnt() == 0 && (*i).second->length() > 0) {
                  dead_sources.push_back (i->second);

                  /* remove this source from our own list to avoid us
                     adding it to the list of all sources below
                  */

                  sources.erase (i);
            }

            i = tmp;
      }

      /* Step 4: get rid of all regions in the region list that use any dead sources
         in case the sources themselves don't go away (they might be referenced in
         other snapshots).
      */
            
      for (vector<Source*>::iterator i = dead_sources.begin(); i != dead_sources.end();++i) {

            for (AudioRegionList::iterator r = audio_regions.begin(); r != audio_regions.end(); ) {
                  AudioRegionList::iterator tmp;
                  AudioRegion* ar;

                  tmp = r;
                  ++tmp;
                  
                  ar = (*r).second;

                  for (uint32_t n = 0; n < ar->n_channels(); ++n) {
                        if (&ar->source (n) == (*i)) {
                              /* this region is dead */
                              remove_region (ar);
                        }
                  }
                  
                  r = tmp;
            }
      }

      /* build a list of all the possible sound directories for the session */

      for (i = session_dirs.begin(); i != session_dirs.end(); ) {

            nexti = i;
            ++nexti;

            sound_path += (*i).path;
            sound_path += sound_dir_name;

            if (nexti != session_dirs.end()) {
                  sound_path += ':';
            }

            i = nexti;
      }
      
      /* now do the same thing for the files that ended up in the sounds dir(s) 
         but are not referenced as sources in any snapshot.
      */

      soundfiles = scanner (sound_path, accept_all_non_peak_files, (void *) 0, false, true);

      if (soundfiles == 0) {
            return 0;
      }

      /* find all sources, but don't use this snapshot because the
         state file on disk still references sources we may have already
         dropped.
      */

      find_all_sources_across_snapshots (all_sources, true);

      /* add our current source list
       */

      for (SourceList::iterator i = sources.begin(); i != sources.end(); ++i) {
            FileSource* fs;
            SndFileSource* sfs;
            
            if ((fs = dynamic_cast<FileSource*> ((*i).second)) != 0) {
                  all_sources.insert (fs->path());
            } else if ((sfs = dynamic_cast<SndFileSource*> ((*i).second)) != 0) {
                  all_sources.insert (sfs->path());
            } 
      }

      for (vector<string*>::iterator x = soundfiles->begin(); x != soundfiles->end(); ++x) {

            used = false;
            spath = **x;

            for (set<string>::iterator i = all_sources.begin(); i != all_sources.end(); ++i) {

                  if (spath == *i) {
                        used = true;
                        break;
                  }

            }

            if (!used) {
                  unused.push_back (spath);
            }
      }

      /* now try to move all unused files into the "dead_sounds" directory(ies) */

      for (vector<string>::iterator x = unused.begin(); x != unused.end(); ++x) {
            struct stat statbuf;

            rep.paths.push_back (*x);
            if (stat ((*x).c_str(), &statbuf) == 0) {
                  rep.space += statbuf.st_size;
            }

            string newpath;
            
            /* don't move the file across filesystems, just
               stick it in the `dead_sound_dir_name' directory
               on whichever filesystem it was already on.
            */

            newpath = PBD::dirname (*x);
            newpath = PBD::dirname (newpath);

            newpath += '/';
            newpath += dead_sound_dir_name;
            newpath += '/';
            newpath += PBD::basename ((*x));
            
            if (access (newpath.c_str(), F_OK) == 0) {
                  
                  /* the new path already exists, try versioning */
                  
                  char buf[PATH_MAX+1];
                  int version = 1;
                  string newpath_v;
                  
                  snprintf (buf, sizeof (buf), "%s.%d", newpath.c_str(), version);
                  newpath_v = buf;

                  while (access (newpath_v.c_str(), F_OK) == 0 && version < 999) {
                        snprintf (buf, sizeof (buf), "%s.%d", newpath.c_str(), ++version);
                        newpath_v = buf;
                  }
                  
                  if (version == 999) {
                        error << compose (_("there are already 1000 files with names like %1; versioning discontinued"),
                                      newpath)
                              << endmsg;
                  } else {
                        newpath = newpath_v;
                  }
                  
            } else {
                  
                  /* it doesn't exist, or we can't read it or something */
                  
            }

            if (::rename ((*x).c_str(), newpath.c_str()) != 0) {
                  error << compose (_("cannot rename audio file source from %1 to %2 (%3)"),
                                (*x), newpath, strerror (errno))
                        << endmsg;
                  goto out;
            }
            

            /* see if there an easy to find peakfile for this file, and remove it.
             */

            string peakpath = (*x).substr (0, (*x).find_last_of ('.'));
            peakpath += ".peak";

            if (access (peakpath.c_str(), W_OK) == 0) {
                  if (::unlink (peakpath.c_str()) != 0) {
                        error << compose (_("cannot remove peakfile %1 for %2 (%3)"),
                                      peakpath, _path, strerror (errno))
                              << endmsg;
                        /* try to back out */
                        rename (newpath.c_str(), _path.c_str());
                        goto out;
                  }
            }

      }

      ret = 0;

      /* dump the history list */

      history.clear ();

      /* save state so we don't end up a session file
         referring to non-existent sources.
      */
      
      save_state ("");

  out:
      _state_of_the_state = (StateOfTheState) (_state_of_the_state & ~InCleanup);
      return ret;
}

int
Session::cleanup_trash_sources (Session::cleanup_report& rep)
{
      vector<space_and_path>::iterator i;
      string dead_sound_dir;
      struct dirent* dentry;
      struct stat statbuf;
      DIR* dead;

      rep.paths.clear ();
      rep.space = 0;

      for (i = session_dirs.begin(); i != session_dirs.end(); ++i) {
            
            dead_sound_dir = (*i).path;
            dead_sound_dir += dead_sound_dir_name;

            if ((dead = opendir (dead_sound_dir.c_str())) == 0) {
                  continue;
            }

            while ((dentry = readdir (dead)) != 0) {

                  /* avoid '.' and '..' */
                  
                  if ((dentry->d_name[0] == '.' && dentry->d_name[1] == '\0') || 
                      (dentry->d_name[2] == '\0' && dentry->d_name[0] == '.' && dentry->d_name[1] == '.')) {
                        continue;
                  }

                  string fullpath;

                  fullpath = dead_sound_dir;
                  fullpath += '/';
                  fullpath += dentry->d_name;

                  if (stat (fullpath.c_str(), &statbuf)) {
                        continue;
                  }

                  if (!S_ISREG (statbuf.st_mode)) {
                        continue;
                  }

                  if (unlink (fullpath.c_str())) {
                        error << compose (_("cannot remove dead sound file %1 (%2)"),
                                      fullpath, strerror (errno))
                              << endmsg;
                  }

                  rep.paths.push_back (dentry->d_name);
                  rep.space += statbuf.st_size;
            }

            closedir (dead);
            
      }

      return 0;
}

void
Session::set_dirty ()
{
      bool was_dirty = dirty();
      
      _state_of_the_state = StateOfTheState (_state_of_the_state | Dirty);

      if (!was_dirty) {
            DirtyChanged(); /* EMIT SIGNAL */
      }
}


void
Session::set_clean ()
{
      bool was_dirty = dirty();
      
      _state_of_the_state = Clean;

      if (was_dirty) {
            DirtyChanged(); /* EMIT SIGNAL */
      }
}


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