editor_audio_import.cc

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/*
    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 "pbd/stateful_diff_command.h"

#include <gtkmm2ext/choice.h>

#include "ardour/audio_track.h"
#include "ardour/audiofilesource.h"
#include "ardour/audioregion.h"
#include "ardour/midi_region.h"
#include "ardour/midi_track.h"
#include "ardour/operations.h"
#include "ardour/region_factory.h"
#include "ardour/smf_source.h"
#include "ardour/source_factory.h"
#include "ardour/utils.h"
#include "pbd/memento_command.h"

#include "ardour_ui.h"
#include "cursor_context.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 "gui_thread.h"
#include "interthread_progress_window.h"
#include "mouse_cursors.h"
#include "editor_cursors.h"

#include "i18n.h"

using namespace std;
using namespace ARDOUR;
using namespace PBD;
using namespace Gtk;
using namespace Gtkmm2ext;
using namespace Editing;
using std::string;

/* 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 (_("Add Existing Media"), _session, 0, true, mode_hint);
        } else {
                sfbrowser->set_mode (mode_hint);
        }

        external_audio_dialog ();
}

void
Editor::external_audio_dialog ()
{
        vector<string> paths;
        uint32_t audio_track_cnt;
        uint32_t midi_track_cnt;

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

        audio_track_cnt = 0;
        midi_track_cnt = 0;

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

                if (atv) {
                        if (atv->is_audio_track()) {
                                audio_track_cnt++;
                        } 

                } else {
                        MidiTimeAxisView* mtv = dynamic_cast<MidiTimeAxisView*>(*x);

                        if (mtv) {
                                if (mtv->is_midi_track()) {
                                        midi_track_cnt++;
                                }
                        }
                }
        }

        if (sfbrowser == 0) {
                sfbrowser = new SoundFileOmega (_("Add Existing Media"), _session, audio_track_cnt, midi_track_cnt, true);
        } else {
                sfbrowser->reset (audio_track_cnt, midi_track_cnt);
        }

        sfbrowser->show_all ();
}

void
Editor::session_import_dialog ()
{
        SessionImportDialog dialog (_session);
        dialog.run ();
}

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

int
Editor::check_whether_and_how_to_import(string path, bool all_or_nothing)
{
        string wave_name (Glib::path_get_basename(path));

        bool already_exists = false;
        uint32_t existing;

        if ((existing = _session->count_sources_by_origin (path)) > 0) {
                already_exists = true;
        }

        int function = 1;

        if (already_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<string>        paths,
                   ImportDisposition     disposition,
                   ImportMode            mode,
                   SrcQuality            quality,
                   framepos_t&           pos,
                   ARDOUR::PluginInfoPtr instrument)
{
        boost::shared_ptr<Track> track;
        vector<string> to_import;
        int nth = 0;
        bool use_timestamp = (pos == -1);

        current_interthread_info = &import_status;
        import_status.current = 1;
        import_status.total = paths.size ();
        import_status.all_done = false;

        ImportProgressWindow ipw (&import_status, _("Import"), _("Cancel Import"));

        bool ok = true;

        if (disposition == Editing::ImportMergeFiles) {

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

                bool cancel = false;
                for (vector<string>::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) {
                        ok = false;
                } else {
                        ipw.show ();
                        ok = (import_sndfiles (paths, disposition, mode, quality, pos, 1, 1, track, false, instrument) == 0);
                }

        } else {

                bool replace = false;

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

                        const 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;
                                abort(); /* NOTREACHED*/
                                break;
                        case 1:
                                replace = false;
                                break;
                        default:
                                fatal << "Illegal return " << check <<  " from check_whether_and_how_to_import()!" << endmsg;
                                abort(); /* NOTREACHED*/
                        }

                        /* have to reset this for every file we handle */

                        if (use_timestamp) {
                                pos = -1;
                        }

                        ipw.show ();

                        switch (disposition) {
                        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, disposition, mode, quality, pos, 1, -1, track, replace, instrument) == 0);
                                break;

                        case Editing::ImportDistinctChannels:

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

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

                        case Editing::ImportSerializeFiles:

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

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

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

        if (ok) {
                _session->save_state ("");
        }

        import_status.all_done = true;
}

void
Editor::do_embed (vector<string> paths, ImportDisposition import_as, ImportMode mode, framepos_t& pos, ARDOUR::PluginInfoPtr instrument)
{
        boost::shared_ptr<Track> track;
        bool check_sample_rate = true;
        bool ok = false;
        vector<string> to_embed;
        bool multi = paths.size() > 1;
        int nth = 0;
        bool use_timestamp = (pos == -1);

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

                        /* have to reset this for every file we handle */
                        if (use_timestamp) {
                                pos = -1;
                        }

                        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, import_as, mode, pos, 1, -1, track, instrument) < -1) {
                                goto out;
                        }
                }
                break;

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

                        /* have to reset this for every file we handle */
                        if (use_timestamp) {
                                pos = -1;
                        }

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

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

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

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

                        /* have to reset this for every file we handle */
                        if (use_timestamp) {
                                pos = -1;
                        }

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

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

        ok = true;

  out:
        if (ok) {
                _session->save_state ("");
        }
}

int
Editor::import_sndfiles (vector<string>            paths,
                         ImportDisposition         disposition,
                         ImportMode                mode,
                         SrcQuality                quality,
                         framepos_t&               pos,
                         int                       target_regions,
                         int                       target_tracks,
                         boost::shared_ptr<Track>& track,
                         bool                      replace,
                         ARDOUR::PluginInfoPtr     instrument)
{
        import_status.paths = paths;
        import_status.done = false;
        import_status.cancel = false;
        import_status.freeze = false;
        import_status.quality = quality;
        import_status.replace_existing_source = replace;

        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;

        CursorContext::Handle cursor_ctx = CursorContext::create(*this, _cursors->wait);
        gdk_flush ();

        /* start import thread for this spec. this will ultimately call Session::import_files()
           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, _import_thread, this);
        pthread_detach (import_status.thread);

        while (!import_status.done && !import_status.cancel) {
                gtk_main_iteration ();
        }

        import_status.done = true;

        int result = -1;

        if (!import_status.cancel && !import_status.sources.empty()) {
                result = add_sources (
                        import_status.paths,
                        import_status.sources,
                        import_status.pos,
                        disposition,
                        import_status.mode,
                        import_status.target_regions,
                        import_status.target_tracks,
                        track, false, instrument
                        );

                /* update position from results */

                pos = import_status.pos;
        }

        import_status.sources.clear();
        return result;
}

int
Editor::embed_sndfiles (vector<string>            paths,
                        bool                      multifile,
                        bool&                     check_sample_rate,
                        ImportDisposition         disposition,
                        ImportMode                mode,
                        framepos_t&               pos,
                        int                       target_regions,
                        int                       target_tracks,
                        boost::shared_ptr<Track>& track,
                        ARDOUR::PluginInfoPtr     instrument)
{
        boost::shared_ptr<AudioFileSource> source;
        SourceList sources;
        string linked_path;
        SoundFileInfo finfo;

        CursorContext::Handle cursor_ctx = CursorContext::create(*this, _cursors->wait);
        gdk_flush ();

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

                string path = *p;
                string error_msg;

                /* note that we temporarily truncated _id at the colon */

                if (!AudioFileSource::get_soundfile_info (path, finfo, error_msg)) {
                        error << string_compose(_("Editor: cannot open file \"%1\", (%2)"), path, error_msg ) << endmsg;
                        return -3;
                }

                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 (
                                        _("Sample rate"),
                                        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 */
                                        return -2;
                                case 1: /* don't embed this one */
                                        return -1;
                                case 2: /* do it, and the rest without asking */
                                        check_sample_rate = false;
                                        break;
                                case 3: /* do it */
                                        break;
                                default:
                                        return -2;
                                }
                        } else {
                                choices.push_back (_("Cancel"));
                                choices.push_back (_("Embed it anyway"));

                                Gtkmm2ext::Choice rate_choice (
                                        _("Sample rate"),
                                        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 */
                                        return -1;
                                case 1: /* do it */
                                        break;
                                default:
                                        return -2;
                                }
                        }
                }

                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->audio_source_by_path_and_channel (path, n)) == 0) {

                                        source = boost::dynamic_pointer_cast<AudioFileSource> (
                                                SourceFactory::createExternal (DataType::AUDIO, *_session,
                                                                               path, 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;
                                return -3;
                        }

                        gtk_main_iteration();
                }
        }

        if (!sources.empty()) {
                return add_sources (paths, sources, pos, disposition, mode, target_regions, target_tracks, track, true, instrument);
        }

        return 0;
}

int
Editor::add_sources (vector<string>            paths,
                     SourceList&               sources,
                     framepos_t&               pos,
                     ImportDisposition         disposition,
                     ImportMode                mode,
                     int                       target_regions,
                     int                       target_tracks,
                     boost::shared_ptr<Track>& track,
                     bool                      /*add_channel_suffix*/,
                     ARDOUR::PluginInfoPtr     instrument)
{
        vector<boost::shared_ptr<Region> > regions;
        string region_name;
        uint32_t input_chan = 0;
        uint32_t output_chan = 0;
        bool use_timestamp;
        vector<string> track_names;

        use_timestamp = (pos == -1);

        // kludge (for MIDI we're abusing "channel" for "track" here)
        if (SMFSource::safe_midi_file_extension (paths.front())) {
                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);

                /* we checked in import_sndfiles() that there were not too many */

                while (RegionFactory::region_by_name (region_name)) {
                        region_name = bump_name_once (region_name, '.');
                }

                PropertyList plist;

                plist.add (ARDOUR::Properties::start, 0);
                plist.add (ARDOUR::Properties::length, sources[0]->length (pos));
                plist.add (ARDOUR::Properties::name, region_name);
                plist.add (ARDOUR::Properties::layer, 0);
                plist.add (ARDOUR::Properties::whole_file, true);
                plist.add (ARDOUR::Properties::external, true);

                boost::shared_ptr<Region> r = RegionFactory::create (sources, plist);

                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);

                /* if we're creating a new track, name it after the cleaned-up
                 * and "merged" region name.
                 */

                track_names.push_back (region_name);

        } 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<FileSource> fs = boost::dynamic_pointer_cast<FileSource> (*x);

                        if (sources.size() > 1 && disposition == ImportDistinctChannels) {

                                /* generate a per-channel region name so that things work as
                                 * intended
                                 */
                                
                                string path;

                                if (fs) {
                                        region_name = basename_nosuffix (fs->path());
                                } else {
                                        region_name = (*x)->name();
                                }
                                
                                if (sources.size() == 2) {
                                        if (n == 0) {
                                                region_name += "-L";
                                        } else {
                                                region_name += "-R";
                                        }
                                } else if (sources.size() > 2) {
                                        region_name += string_compose ("-%1", n+1);
                                }
                                
                                track_names.push_back (region_name);
                                
                        } else {
                                if (fs) {
                                        region_name = region_name_from_path (fs->path(), false, false, sources.size(), n);
                                } else {
                                        region_name = (*x)->name();
                                }

                                if (SMFSource::safe_midi_file_extension (paths.front())) {
                                        string track_name = string_compose ("%1-t%2", PBD::basename_nosuffix (fs->path()), (n + 1));
                                        track_names.push_back (track_name);
                                } else {
                                        track_names.push_back (PBD::basename_nosuffix (paths[n]));
                                }
                        }

                        PropertyList plist;

                        /* Fudge region length to ensure it is non-zero; make it 1 beat at 120bpm
                           for want of a better idea.  It can't be too small, otherwise if this
                           is a MIDI region the conversion from frames -> beats -> frames will
                           round it back down to 0 again.
                        */
                        framecnt_t len = (*x)->length (pos);
                        if (len == 0) {
                                len = (60.0 / 120.0) * _session->frame_rate ();
                        }

                        plist.add (ARDOUR::Properties::start, 0);
                        plist.add (ARDOUR::Properties::length, len);
                        plist.add (ARDOUR::Properties::name, region_name);
                        plist.add (ARDOUR::Properties::layer, 0);
                        plist.add (ARDOUR::Properties::whole_file, true);
                        plist.add (ARDOUR::Properties::external, true);

                        boost::shared_ptr<Region> r = RegionFactory::create (just_one, plist);

                        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;
        framepos_t rlen = 0;

        begin_reversible_command (Operations::insert_file);

        /* we only use tracks names when importing to new tracks, but we
         * require that one is defined for every region, just to keep
         * the API simpler.
         */
        assert (regions.size() == track_names.size());
        
        for (vector<boost::shared_ptr<Region> >::iterator r = regions.begin(); r != regions.end(); ++r, ++n) {
                boost::shared_ptr<AudioRegion> ar = boost::dynamic_pointer_cast<AudioRegion> (*r);

                if (use_timestamp) {
                        if (ar) {

                                /* get timestamp for this region */

                                const boost::shared_ptr<Source> s (ar->sources().front());
                                const boost::shared_ptr<AudioSource> as = boost::dynamic_pointer_cast<AudioSource> (s);

                                assert (as);

                                if (as->natural_position() != 0) {
                                        pos = as->natural_position();
                                } else if (target_tracks == 1) {
                                        /* hmm, no timestamp available, put it after the previous region
                                         */
                                        if (n == 0) {
                                                pos = get_preferred_edit_position ();
                                        } else {
                                                pos += rlen;
                                        }
                                } else {
                                        pos = get_preferred_edit_position ();
                                }
                        } else {
                                /* should really get first position in MIDI file, but for now, use edit position*/
                                pos = get_preferred_edit_position ();
                        }
                }
                
                finish_bringing_in_material (*r, input_chan, output_chan, pos, mode, track, track_names[n], instrument);

                rlen = (*r)->length();

                if (target_tracks != 1) {
                        track.reset ();
                } else {
                        if (!use_timestamp || !ar) {
                                /* line each one up right after the other */
                                pos += (*r)->length();
                        }
                }
        }

        commit_reversible_command ();
        
        /* 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,
                                     framepos_t&               pos,
                                     ImportMode                mode,
                                     boost::shared_ptr<Track>& existing_track,
                                     const string&             new_track_name,
                                     ARDOUR::PluginInfoPtr     instrument)
{
        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->playlist();
                boost::shared_ptr<Region> copy (RegionFactory::create (region, region->properties()));
                playlist->clear_changes ();
                playlist->add_region (copy, pos);
                if (Config->get_edit_mode() == Ripple)
                        playlist->ripple (pos, copy->length(), copy);

                _session->add_command (new StatefulDiffCommand (playlist));
                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 (ChanCount (DataType::MIDI, 1),
                                                                  ChanCount (DataType::MIDI, 1),
                                                                  instrument,
                                                                  Normal, 0, 1));

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

                                existing_track = mt.front();
                        }

                        if (!new_track_name.empty()) {
                                existing_track->set_name (new_track_name);
                        } else {
                                existing_track->set_name (region->name());
                        }
                }

                boost::shared_ptr<Playlist> playlist = existing_track->playlist();
                boost::shared_ptr<Region> copy (RegionFactory::create (region, true));
                playlist->clear_changes ();
                playlist->add_region (copy, pos);
                _session->add_command (new StatefulDiffCommand (playlist));
                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<Playlist> playlist = at.front()->playlist();
                        boost::shared_ptr<Region> copy (RegionFactory::create (region, true));
                        playlist->clear_changes ();
                        playlist->add_region (copy, pos);
                        _session->add_command (new StatefulDiffCommand (playlist));
                }
                break;
        }
        }

        return 0;
}

void *
Editor::_import_thread (void *arg)
{
        SessionEvent::create_per_thread_pool ("import events", 64);

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

void *
Editor::import_thread ()
{
        _session->import_files (import_status);
        return 0;
}