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editor_audio_import.cc

/*
    Copyright (C) 2000-2006 Paul Davis 

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <errno.h>
#include <unistd.h>
#include <algorithm>

#include <sndfile.h>

#include <pbd/pthread_utils.h>
#include <pbd/basename.h>
#include <pbd/shortpath.h>

#include <gtkmm2ext/choice.h>

#include <ardour/session.h>
#include <ardour/audioplaylist.h>
#include <ardour/audioregion.h>
#include <ardour/audio_diskstream.h>
#include <ardour/utils.h>
#include <ardour/audio_track.h>
#include <ardour/audioplaylist.h>
#include <ardour/audiofilesource.h>
#include <ardour/region_factory.h>
#include <ardour/source_factory.h>
#include <ardour/session.h>
#include <pbd/memento_command.h>

#include "ardour_ui.h"
#include "editor.h"
#include "sfdb_ui.h"
#include "editing.h"
#include "audio_time_axis.h"
#include "utils.h"
#include "gui_thread.h"

#include "i18n.h"

using namespace std;
using namespace ARDOUR;
using namespace PBD;
using namespace sigc;
using namespace Gtk;
using namespace Gtkmm2ext;
using namespace Editing;
using Glib::ustring;

/* Functions supporting the incorporation of external (non-captured) audio material into ardour */

void
Editor::add_external_audio_action (ImportMode mode_hint)
{
      if (session == 0) {
            MessageDialog msg (_("You can't import or embed an audiofile until you have a session loaded."));
            msg.run ();
            return;
      }
      
      if (sfbrowser == 0) {
            sfbrowser = new SoundFileOmega (*this, _("Add existing audio"), session, 0, true, mode_hint);
      } else {
            sfbrowser->set_mode (mode_hint);
      }

      external_audio_dialog ();
}

void
Editor::external_audio_dialog ()
{
      vector<Glib::ustring> paths;
      uint32_t track_cnt;

      if (session == 0) {
            MessageDialog msg (_("You can't import or embed an audiofile until you have a session loaded."));
            msg.run ();
            return;
      }
      
      track_cnt = 0;

      for (TrackSelection::iterator x = selection->tracks.begin(); x != selection->tracks.end(); ++x) {
            AudioTimeAxisView* atv = dynamic_cast<AudioTimeAxisView*>(*x);
            
            if (!atv) {
                  continue;
            } else if (atv->is_audio_track()) {
                  track_cnt++;
            }
      }

      if (sfbrowser == 0) {
            sfbrowser = new SoundFileOmega (*this, _("Add existing audio"), session, track_cnt, true);
      } else {
            sfbrowser->reset (track_cnt);
      }

      sfbrowser->show_all ();


      bool keepRunning;

      do {
            keepRunning = false;

            int response = sfbrowser->run ();

            switch (response) {
                  case RESPONSE_APPLY:
                        // leave the dialog open
                        break;

                  case RESPONSE_OK:
                        sfbrowser->hide ();
                        break;

                  default:
                        // cancel from the browser - we are done
                        sfbrowser->hide ();
                        return;
            }

            /* lets do it */

            paths = sfbrowser->get_paths ();

            ImportPosition pos = sfbrowser->get_position ();
            ImportMode mode = sfbrowser->get_mode ();
            ImportDisposition chns = sfbrowser->get_channel_disposition ();
            nframes64_t where;

            switch (pos) {
                  case ImportAtEditPoint:
                        where = get_preferred_edit_position ();
                        break;
                  case ImportAtTimestamp:
                        where = -1;
                        break;
                  case ImportAtPlayhead:
                        where = playhead_cursor->current_frame;
                        break;
                  case ImportAtStart:
                        where = session->current_start_frame();
                        break;
            }

            SrcQuality quality = sfbrowser->get_src_quality();


            if (sfbrowser->copy_files_btn.get_active()) {
                  do_import (paths, chns, mode, quality, where);
            } else {
                  do_embed (paths, chns, mode, where);
            }

            if (response == RESPONSE_APPLY) {
                  sfbrowser->clear_selection ();
                  keepRunning = true;
            }

      } while (keepRunning);
}

typedef std::map<PBD::ID,boost::shared_ptr<AudioSource> > AudioSourceList;

/**
 * Updating is still disabled, see note in libs/ardour/import.cc Session::import_audiofiles()
 *
 * all_or_nothing:
 *   true  = show "Update", "Import" and "Skip"
 *   false = show "Import", and "Cancel"
 *
 * Returns:
 *     0  To update an existing source of the same name
 *     1  To import/embed the file normally (make sure the new name will be unique)
 *     2  If the user wants to skip this file
 **/
int
Editor::check_whether_and_how_to_import(string path, bool all_or_nothing)
{
      string wave_name (Glib::path_get_basename(path));

      AudioSourceList all_sources = session->get_audio_sources();
      bool wave_name_exists = false;

      for (AudioSourceList::iterator i = all_sources.begin(); i != all_sources.end(); ++i) {

            boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource>(i->second);

            string tmp (Glib::path_get_basename (afs->path()));

            if (tmp == wave_name) {
                  wave_name_exists = true;
                  break;
            }
      }

      int function = 1;

      if (wave_name_exists) {
            string message;
            if (all_or_nothing) {
                  // updating is still disabled
                  //message = string_compose(_("The session already contains a source file named %1. Do you want to update that file (and thus all regions using the file) or import this file as a new file?"),wave_name);
                  message = string_compose(_("The session already contains a source file named %1. This file will be imported as a new file, please confirm."),wave_name);
            } else {
                  message = string_compose(_("A source file %1 already exists. This operation will not update that source but import the file %2 as a new source, please confirm."), wave_name, wave_name);

            }
            MessageDialog dialog(message, false,Gtk::MESSAGE_QUESTION, Gtk::BUTTONS_NONE, true);

            if (all_or_nothing) {
                  // disabled
                  //dialog.add_button("Update", 0);
                  dialog.add_button("Import", 1);
                  dialog.add_button("Skip",   2);
            } else {
                  dialog.add_button("Import", 1);
                  dialog.add_button("Cancel", 2);
            }
            
            //dialog.add_button("Skip all", 4); // All or rest?

            dialog.show();

            function = dialog.run ();

            dialog.hide();
      }

      return function;
}

boost::shared_ptr<AudioTrack>
Editor::get_nth_selected_audio_track (int nth) const
{
      AudioTimeAxisView* atv;
      TrackSelection::iterator x;
      
      for (x = selection->tracks.begin(); nth > 0 && x != selection->tracks.end(); ++x) {

            atv = dynamic_cast<AudioTimeAxisView*>(*x);
            
            if (!atv) {
                  continue;
            } else if (atv->is_audio_track()) {
                  --nth;
            }
      }
      
      if (x == selection->tracks.end()) {
            atv = dynamic_cast<AudioTimeAxisView*>(selection->tracks.back());
      } else {
            atv = dynamic_cast<AudioTimeAxisView*>(*x);
      }
      
      if (!atv || !atv->is_audio_track()) {
            return boost::shared_ptr<AudioTrack>();
      }
      
      return atv->audio_track();
}     

void
Editor::do_import (vector<ustring> paths, ImportDisposition chns, ImportMode mode, SrcQuality quality, nframes64_t& pos)
{
      //this is where an import "starts" so initialize the count here ... the rest gets initialized in import_sndfiles()
      import_status.count = 0;

      boost::shared_ptr<AudioTrack> track;
      vector<ustring> to_import;
      int nth = 0;

      if (interthread_progress_window == 0) {
            build_interthread_progress_window ();
      }

      if (chns == Editing::ImportMergeFiles) {

            /* create 1 region from all paths, add to 1 track,
               ignore "track"
            */

            bool cancel = false;
            for (vector<ustring>::iterator a = paths.begin(); a != paths.end(); ++a) {
                  int check = check_whether_and_how_to_import(*a, false);
                  if (check == 2) {
                        cancel = true;
                        break;
                  }
            }

            if (!cancel) {
                  import_sndfiles (paths, mode, quality, pos, 1, 1, track, false, paths.size());
            }

      } else {

            bool replace = false;
            bool ok = true;
            vector<ustring>::size_type total = paths.size();

            for (vector<ustring>::iterator a = paths.begin(); a != paths.end() && ok; ++a) {

                  int check = check_whether_and_how_to_import (*a, true);

                  switch (check) {
                  case 2:
                        // user said skip
                        continue;
                  case 0:
                        fatal << "Updating existing sources should be disabled!" << endmsg;
                        /* NOTREACHED*/
                        break;
                  case 1:
                        replace = false;
                        break;
                  default:
                        fatal << "Illegal return " << check <<  " from check_whether_and_how_to_import()!" << endmsg;
                        /* NOTREACHED*/
                  }


                  switch (chns) {
                  case Editing::ImportDistinctFiles:
                        
                        to_import.clear ();
                        to_import.push_back (*a);
                        
                        if (mode == Editing::ImportToTrack) {
                              track = get_nth_selected_audio_track (nth++);
                        }
                        
                        ok = (import_sndfiles (to_import, mode, quality, pos, 1, -1, track, replace, total) == 0);
                        break;
                        
                  case Editing::ImportDistinctChannels:
                        
                        to_import.clear ();
                        to_import.push_back (*a);
                        
                        ok = (import_sndfiles (to_import, mode, quality, pos, -1, -1, track, replace, total) == 0);
                        break;
                        
                  case Editing::ImportSerializeFiles:
                        
                        to_import.clear ();
                        to_import.push_back (*a);

                        ok = (import_sndfiles (to_import, mode, quality, pos, 1, 1, track, replace, total) == 0);
                        break;

                  case Editing::ImportMergeFiles:
                        // Not entered, handled in earlier if() branch
                        break;
                  }
            }
      }

      interthread_progress_window->hide_all ();
}

void
Editor::do_embed (vector<ustring> paths, ImportDisposition chns, ImportMode mode, nframes64_t& pos)
{
      boost::shared_ptr<AudioTrack> track;
      bool check_sample_rate = true;
      bool ok = false;
      vector<ustring> to_embed;
      bool multi = paths.size() > 1;
      int nth = 0;

      switch (chns) {
      case Editing::ImportDistinctFiles:
            for (vector<ustring>::iterator a = paths.begin(); a != paths.end(); ++a) {

                  to_embed.clear ();
                  to_embed.push_back (*a);

                  if (mode == Editing::ImportToTrack) {
                        track = get_nth_selected_audio_track (nth++);
                  }

                  if (embed_sndfiles (to_embed, multi, check_sample_rate, mode, pos, 1, -1, track) < -1) {
                        goto out;
                  }
            }
            break;
            
      case Editing::ImportDistinctChannels:
            for (vector<ustring>::iterator a = paths.begin(); a != paths.end(); ++a) {

                  to_embed.clear ();
                  to_embed.push_back (*a);

                  if (embed_sndfiles (to_embed, multi, check_sample_rate, mode, pos, -1, -1, track) < -1) {
                        goto out;
                  }
            }
            break;

      case Editing::ImportMergeFiles:
            if (embed_sndfiles (paths, multi, check_sample_rate, mode, pos, 1, 1, track) < -1) {
                  goto out;
            }
      break;

      case Editing::ImportSerializeFiles:
            for (vector<ustring>::iterator a = paths.begin(); a != paths.end(); ++a) {

                  to_embed.clear ();
                  to_embed.push_back (*a);

                  if (embed_sndfiles (to_embed, multi, check_sample_rate, mode, pos, 1, 1, track) < -1) {
                        goto out;
                  }
            }
            break;
      }

      ok = true;
      
  out:      
      if (ok) {
            session->save_state ("");
      }
}

int
Editor::import_sndfiles (vector<ustring> paths, ImportMode mode, SrcQuality quality, nframes64_t& pos, 
                   int target_regions, int target_tracks, boost::shared_ptr<AudioTrack> track, bool replace,
                   uint32_t total)
{
      interthread_progress_window->set_title (string_compose (_("Importing %1"), paths.front()));
      interthread_progress_window->set_position (Gtk::WIN_POS_MOUSE);
      interthread_progress_bar.set_fraction (0.0f);
      interthread_cancel_label.set_text (_("Cancel Import"));
      current_interthread_info = &import_status;

      import_status.paths = paths;
      import_status.done = false;
      import_status.cancel = false;
      import_status.freeze = false;
      import_status.done = 0.0;
      import_status.quality = quality;
      import_status.replace_existing_source = replace;
      import_status.total = total;

      import_status.mode = mode;
      import_status.pos = pos;
      import_status.target_tracks = target_tracks;
      import_status.target_regions = target_regions;
      import_status.track = track;
      import_status.replace = replace;
      interthread_progress_connection = Glib::signal_timeout().connect 
            (bind (mem_fun(*this, &Editor::import_progress_timeout), (gpointer) 0), 500);
      
      track_canvas->get_window()->set_cursor (Gdk::Cursor (Gdk::WATCH));
      gdk_flush ();

      /* start import thread for this spec. this will ultimately call Session::import_audiofile()
         which, if successful, will add the files as regions to the region list. its up to us
         (the GUI) to direct additional steps after that.
      */

      pthread_create_and_store ("import", &import_status.thread, 0, _import_thread, this);
      pthread_detach (import_status.thread);
      
      while (!import_status.done && !import_status.cancel) {
            gtk_main_iteration ();
      }

      interthread_progress_window->hide ();
      import_status.done = true;
      interthread_progress_connection.disconnect ();
      
      if (!import_status.cancel && !import_status.sources.empty()) {
            if (add_sources (import_status.paths, 
                         import_status.sources, 
                         import_status.pos, 
                         import_status.mode, 
                         import_status.target_regions, 
                         import_status.target_tracks, 
                         import_status.track, false) == 0) {
                  session->save_state ("");
            }
            
            /* update position from results */
            
            pos = import_status.pos;
      }


      track_canvas->get_window()->set_cursor (*current_canvas_cursor);
      return 0;
}

int
Editor::embed_sndfiles (vector<Glib::ustring> paths, bool multifile,
                  bool& check_sample_rate, ImportMode mode, nframes64_t& pos, int target_regions, int target_tracks,
                  boost::shared_ptr<AudioTrack> track)
{
      boost::shared_ptr<AudioFileSource> source;
      SourceList sources;
      string linked_path;
      SoundFileInfo finfo;
      int ret = 0;
      Glib::ustring path_to_use;

      track_canvas->get_window()->set_cursor (Gdk::Cursor (Gdk::WATCH));
      gdk_flush ();

      for (vector<Glib::ustring>::iterator p = paths.begin(); p != paths.end(); ++p) {

            ustring path = *p;

            /* lets see if we can link it into the session */
            
            linked_path = session->sound_dir();
            linked_path += '/';
            linked_path += Glib::path_get_basename (path);

            path_to_use = path;
            
            if (link (path.c_str(), linked_path.c_str()) == 0) {

                  /* there are many reasons why link(2) might have failed.
                     but if it succeeds, we now have a link in the
                     session sound dir that will protect against
                     unlinking of the original path. nice.
                  */
                  
                  path = linked_path;
                  path_to_use = Glib::path_get_basename (linked_path);

            } else {

                  /* one possible reason is that its already linked */

                  if (errno == EEXIST) {
                        struct stat sb;

                        if (stat (linked_path.c_str(), &sb) == 0) {
                              if (sb.st_nlink > 1) { // its a hard link, assume its the one we want
                                    path = linked_path;
                                    path_to_use = Glib::path_get_basename (linked_path);
                              }
                        }
                  }
            }
            
            /* note that we temporarily truncated _id at the colon */
            
            string error_msg;

            if (!AudioFileSource::get_soundfile_info (path, finfo, error_msg)) {
                  error << string_compose(_("Editor: cannot open file \"%1\", (%2)"), path, error_msg ) << endmsg;
                  goto out;
            }
            
            if (check_sample_rate  && (finfo.samplerate != (int) session->frame_rate())) {
                  vector<string> choices;
                  
                  if (multifile) {
                        choices.push_back (_("Cancel entire import"));
                        choices.push_back (_("Don't embed it"));
                        choices.push_back (_("Embed all without questions"));
                  
                        Gtkmm2ext::Choice rate_choice (
                              string_compose (_("%1\nThis audiofile's sample rate doesn't match the session sample rate!"), 
                                          short_path (path, 40)),
                              choices, false);
                        
                        int resx = rate_choice.run ();
                        
                        switch (resx) {
                        case 0: /* stop a multi-file import */
                              ret = -2;
                              goto out;
                        case 1: /* don't embed this one */
                              ret = -1;
                              goto out;
                        case 2: /* do it, and the rest without asking */
                              check_sample_rate = false;
                              break;
                        case 3: /* do it */
                              break;
                        default:
                              ret = -2;
                              goto out;
                        }
                  } else {
                        choices.push_back (_("Cancel"));
                        choices.push_back (_("Embed it anyway"));
                  
                        Gtkmm2ext::Choice rate_choice (
                              string_compose (_("%1\nThis audiofile's sample rate doesn't match the session sample rate!"), path),
                              choices, false);
                        
                        int resx = rate_choice.run ();
                        
                        switch (resx) {
                        case 0: /* don't import */
                              ret = -1;
                              goto out;
                        case 1: /* do it */
                              break;
                        default:
                              ret = -2;
                              goto out;
                        }
                  }
            }
            
            track_canvas->get_window()->set_cursor (Gdk::Cursor (Gdk::WATCH));

            for (int n = 0; n < finfo.channels; ++n) {
                  try {

                        /* check if we have this thing embedded already */

                        boost::shared_ptr<Source> s;

                        if ((s = session->source_by_path_and_channel (path, n)) == 0) {

                              source = boost::dynamic_pointer_cast<AudioFileSource> (SourceFactory::createReadable 
                                                                         (*session, path_to_use,  n,
                                                                        (mode == ImportAsTapeTrack ? 
                                                                         AudioFileSource::Destructive : 
                                                                         AudioFileSource::Flag (0)),
                                                                        true, true));
                        } else {
                              source = boost::dynamic_pointer_cast<AudioFileSource> (s);
                        }

                        sources.push_back(source);
                  } 
                  
                  catch (failed_constructor& err) {
                        error << string_compose(_("could not open %1"), path) << endmsg;
                        goto out;
                  }
                  
                  ARDOUR_UI::instance()->flush_pending ();
            }
      }

      if (sources.empty()) {
            goto out;
      }

      ret = add_sources (paths, sources, pos, mode, target_regions, target_tracks, track, true);

  out:
      track_canvas->get_window()->set_cursor (*current_canvas_cursor);
      return ret;
}

int
Editor::add_sources (vector<Glib::ustring> paths, SourceList& sources, nframes64_t& pos, ImportMode mode, 
                 int target_regions, int target_tracks, boost::shared_ptr<AudioTrack>& track, bool add_channel_suffix)
{
      vector<boost::shared_ptr<AudioRegion> > regions;
      ustring region_name;
      uint32_t input_chan = 0;
      uint32_t output_chan = 0;
      bool use_timestamp;
      
      use_timestamp = (pos == -1);

      if (use_timestamp) {
            if (sources[0]->natural_position() != 0) {
                  pos = sources[0]->natural_position();
            } else {
                  pos = get_preferred_edit_position ();
            }
      }

      if (target_regions == 1) {

            /* take all the sources we have and package them up as a region */

            region_name = region_name_from_path (paths.front(), (sources.size() > 1), false);
            boost::shared_ptr<AudioRegion> ar = boost::dynamic_pointer_cast<AudioRegion> 
                           (RegionFactory::create (sources, 0, sources[0]->length(), region_name, 0,
                                             Region::Flag (Region::DefaultFlags|Region::WholeFile|Region::External)));
                                             
        if (use_timestamp) {
                ar->special_set_position(sources[0]->natural_position());
            }
            
            regions.push_back (ar);
            
      } else if (target_regions == -1 || target_regions > 1) {

            /* take each source and create a region for each one */

            SourceList just_one;
            SourceList::iterator x;
            uint32_t n;

            for (n = 0, x = sources.begin(); x != sources.end(); ++x, ++n) {

                  just_one.clear ();
                  just_one.push_back (*x);
                  
                  boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource> (*x);

                  region_name = region_name_from_path (afs->path(), false, true, sources.size(), n);
                  boost::shared_ptr<AudioRegion> ar = boost::dynamic_pointer_cast<AudioRegion> 
                                 (RegionFactory::create (just_one, 0, (*x)->length(), region_name, 0,
                                                   Region::Flag (Region::DefaultFlags|Region::WholeFile|Region::External)));

            if (use_timestamp) {
                ar->special_set_position((*x)->natural_position());
            }

                  regions.push_back (ar);
            }
      }

      if (target_regions == 1) {
            input_chan = regions.front()->n_channels();
      } else {
            if (target_tracks == 1) {
                  input_chan = regions.size();
            } else {
                  input_chan = 1;
            }
      }

      if (Config->get_output_auto_connect() & AutoConnectMaster) {
            output_chan = (session->master_out() ? session->master_out()->n_inputs() : input_chan);
      } else {
            output_chan = input_chan;
      }

      int n = 0;

      for (vector<boost::shared_ptr<AudioRegion> >::iterator r = regions.begin(); r != regions.end(); ++r, ++n) {

            finish_bringing_in_audio (*r, input_chan, output_chan, pos, mode, track);

            if (target_tracks != 1) {
                  track.reset ();
            } else {
                  pos += (*r)->length();
            } 
      }

      /* setup peak file building in another thread */

      for (SourceList::iterator x = sources.begin(); x != sources.end(); ++x) {
            SourceFactory::setup_peakfile (*x, true);
      }

      return 0;
}
      
int
Editor::finish_bringing_in_audio (boost::shared_ptr<AudioRegion> region, uint32_t in_chans, uint32_t out_chans, nframes64_t& pos, 
                          ImportMode mode, boost::shared_ptr<AudioTrack>& existing_track)
{
      switch (mode) {
      case ImportAsRegion:
            /* relax, its been done */
            break;
            
      case ImportToTrack:
      {
            if (!existing_track) {

                  existing_track = get_nth_selected_audio_track (0);

                  if (!existing_track) {
                        return -1;
                  }
            }

            boost::shared_ptr<Playlist> playlist = existing_track->diskstream()->playlist();
            boost::shared_ptr<AudioRegion> copy (boost::dynamic_pointer_cast<AudioRegion> (RegionFactory::create (region)));
            begin_reversible_command (_("insert sndfile"));
            XMLNode &before = playlist->get_state();
            playlist->add_region (copy, pos);
            session->add_command (new MementoCommand<Playlist>(*playlist, &before, &playlist->get_state()));
            commit_reversible_command ();
            break;
      }

      case ImportAsTrack:
      { 
            if (!existing_track) {
                  list<boost::shared_ptr<AudioTrack> > at (session->new_audio_track (in_chans, out_chans, Normal, 1));

                  if (at.empty()) {
                        return -1;
                  }

                  existing_track = at.front();
                  existing_track->set_name (region->name(), this);
            }

            boost::shared_ptr<AudioRegion> copy (boost::dynamic_pointer_cast<AudioRegion> (RegionFactory::create (region)));
            existing_track->diskstream()->playlist()->add_region (copy, pos);
            break;
      }


      case ImportAsTapeTrack:
      {
            list<boost::shared_ptr<AudioTrack> > at (session->new_audio_track (in_chans, out_chans, Destructive));
            if (!at.empty()) {
                  boost::shared_ptr<AudioRegion> copy (boost::dynamic_pointer_cast<AudioRegion> (RegionFactory::create (region)));
                  at.front()->set_name (basename_nosuffix (copy->name()), this);
                  at.front()->diskstream()->playlist()->add_region (copy, pos);
            }
            break;
      }
      }

      return 0;
}

void *
Editor::_import_thread (void *arg)
{
      PBD::notify_gui_about_thread_creation (pthread_self(), X_("Import"));

      Editor *ed = (Editor *) arg;
      return ed->import_thread ();
}

void *
Editor::import_thread ()
{
      session->import_audiofiles (import_status);
      pthread_exit_pbd (0);
      /*NOTREACHED*/
      return 0;
}

gint
Editor::import_progress_timeout (void *arg)
{
      bool reset = false;

      if (!interthread_progress_window->is_visible()) {
            interthread_progress_window->show_all ();
            reset = true;
      }
      
      interthread_progress_label.set_text (import_status.doing_what);

      if (import_status.freeze) {
            interthread_cancel_button.set_sensitive(false);
      } else {
            interthread_cancel_button.set_sensitive(true);
      }

      if (import_status.doing_what == "building peak files") {
            interthread_progress_bar.pulse ();
            return FALSE;
      } else {
            float val = import_status.progress;
            interthread_progress_bar.set_fraction (min (max (0.0f, val), 1.0f));
      }

      if (reset) {

            /* the window is now visible, speed up the updates */
            
            interthread_progress_connection.disconnect ();
            interthread_progress_connection = Glib::signal_timeout().connect 
                  (bind (mem_fun(*this, &Editor::import_progress_timeout), (gpointer) 0), 100);
            return false;
      } else {
            return !(import_status.done || import_status.cancel);
      }
}


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