ardour/gtk2_ardour/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/session_directory.h"
#include "ardour/audioplaylist.h"
#include "ardour/audioregion.h"
#include "ardour/audio_diskstream.h"
#include "ardour/midi_track.h"
#include "ardour/midi_region.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 "midi_time_axis.h"
#include "session_import_dialog.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 Media"), 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 Media"), 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);
}

void
Editor::session_import_dialog ()
{
	SessionImportDialog dialog (*session);
	ensure_float (dialog);
	dialog.run ();
}

typedef std::map<PBD::ID,boost::shared_ptr<ARDOUR::Source> > SourceMap;

/**
 * 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));

	SourceMap all_sources = session->get_sources();
	bool wave_name_exists = false;

	for (SourceMap::iterator i = all_sources.begin(); i != all_sources.end(); ++i) {
		string tmp (Glib::path_get_basename (i->second->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.  Do you want to import %1 as a new file, or skip it?"), wave_name);
		} else {
			message = string_compose (_("The session already contains a source file named %1.  Do you want to import %2 as a new source, or skip it?"), 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();
}

boost::shared_ptr<MidiTrack>
Editor::get_nth_selected_midi_track (int nth) const
{
	MidiTimeAxisView* mtv;
	TrackSelection::iterator x;

	for (x = selection->tracks.begin(); nth > 0 && x != selection->tracks.end(); ++x) {

		mtv = dynamic_cast<MidiTimeAxisView*>(*x);

		if (!mtv) {
			continue;
		} else if (mtv->is_midi_track()) {
			--nth;
		}
	}

	if (x == selection->tracks.end()) {
		mtv = dynamic_cast<MidiTimeAxisView*>(selection->tracks.back());
	} else {
		mtv = dynamic_cast<MidiTimeAxisView*>(*x);
	}

	if (!mtv || !mtv->is_midi_track()) {
		return boost::shared_ptr<MidiTrack>();
	}

	return mtv->midi_track();
}

void
Editor::do_import (vector<ustring> paths, ImportDisposition chns, ImportMode mode, SrcQuality quality, nframes64_t& pos)
{
	boost::shared_ptr<Track> 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 {

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

			int const check = check_whether_and_how_to_import (*a, true);

			if (check != 2) {
				to_import.push_back (*a);
			}
		}

		bool ok = true;

		switch (chns) {
		case Editing::ImportDistinctFiles:

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

			ok = (import_sndfiles (to_import, mode, quality, pos, 1, -1, track, false, to_import.size()) == 0);
			break;

		case Editing::ImportDistinctChannels:
			ok = (import_sndfiles (to_import, mode, quality, pos, -1, -1, track, false, to_import.size()) == 0);
			break;

		case Editing::ImportSerializeFiles:
			ok = (import_sndfiles (to_import, mode, quality, pos, 1, 1, track, false, to_import.size()) == 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<Track> 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<Track> 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_audiofiles()
	   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<Track>& 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 */

		sys::path tmp = session->session_directory().sound_path() / Glib::path_get_basename(path);
		linked_path = tmp.to_string();

		path_to_use = linked_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 (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 (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 (DataType::AUDIO, *session,
									path_to_use, false, n,
									(mode == ImportAsTapeTrack
										? Source::Destructive
										: Source::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<Track>& track, bool /*add_channel_suffix*/)
{
	vector<boost::shared_ptr<Region> > 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 ();
		}
	}

	// kludge (for MIDI we're abusing "channel" for "track" here)
	if (paths.front().rfind(".mid") != Glib::ustring::npos)
		target_regions = -1;

	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<Region> r = RegionFactory::create (sources, 0, sources[0]->length(pos), region_name, 0,
								     Region::Flag (Region::DefaultFlags|Region::WholeFile|Region::External));

		if (use_timestamp && boost::dynamic_pointer_cast<AudioRegion>(r)) {
			boost::dynamic_pointer_cast<AudioRegion>(r)->special_set_position(sources[0]->natural_position());
     		}

		regions.push_back (r);


	} 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);

			region_name = region_name_from_path ((*x)->path(), false, false, sources.size(), n);

			boost::shared_ptr<Region> r = RegionFactory::create (just_one, 0, (*x)->length(pos), region_name, 0,
									     Region::Flag (Region::DefaultFlags|Region::WholeFile|Region::External));

			if (use_timestamp && boost::dynamic_pointer_cast<AudioRegion>(r)) {
				boost::dynamic_pointer_cast<AudioRegion>(r)->special_set_position((*x)->natural_position());
			}

			regions.push_back (r);
		}
	}

	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().n_audio() : input_chan);
	} else {
		output_chan = input_chan;
	}

	int n = 0;

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

		finish_bringing_in_material (*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_material (boost::shared_ptr<Region> region, uint32_t in_chans, uint32_t out_chans, nframes64_t& pos,
				  ImportMode mode, boost::shared_ptr<Track>& existing_track)
{
	boost::shared_ptr<AudioRegion> ar = boost::dynamic_pointer_cast<AudioRegion>(region);
	boost::shared_ptr<MidiRegion> mr = boost::dynamic_pointer_cast<MidiRegion>(region);

	switch (mode) {
	case ImportAsRegion:
		/* relax, its been done */
		break;

	case ImportToTrack:
	{
		if (!existing_track) {

			if (ar) {
				existing_track = get_nth_selected_audio_track (0);
			} else if (mr) {
				existing_track = get_nth_selected_midi_track (0);
			}

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

		boost::shared_ptr<Playlist> playlist = existing_track->diskstream()->playlist();
		boost::shared_ptr<Region> copy (RegionFactory::create (region));
		begin_reversible_command (_("insert file"));
		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) {
			if (ar) {
				list<boost::shared_ptr<AudioTrack> > at (session->new_audio_track (in_chans, out_chans, Normal, 0, 1));

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

				existing_track = at.front();
			} else if (mr) {
				list<boost::shared_ptr<MidiTrack> > mt (session->new_midi_track (Normal, 0, 1));

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

				existing_track = mt.front();
			}

			existing_track->set_name (region->name());
		}

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


	case ImportAsTapeTrack:
	{
		if (!ar)
			return -1;

		list<boost::shared_ptr<AudioTrack> > at (session->new_audio_track (in_chans, out_chans, Destructive));
		if (!at.empty()) {
			boost::shared_ptr<Region> copy (RegionFactory::create (region));
			at.front()->set_name (basename_nosuffix (copy->name()));
			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);
	}
}