VST report audioMasterPinConnected according to Pin Management
[ardour.git] / libs / ardour / import.cc
index 405edc622be794480252037d17cd65f73657cc4f..0656cdca6fd1ce32466dc6d3e5cbb58d18364d03 100644 (file)
@@ -1,22 +1,26 @@
 /*
-    Copyright (C) 2000 Paul Davis 
+  Copyright (C) 2000 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 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.
+  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.
+  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.
 
 */
 
+#ifdef WAF_BUILD
+#include "libardour-config.h"
+#endif
+
 #include <cstdio>
 #include <cstdlib>
 #include <string>
 #include <unistd.h>
 #include <sys/stat.h>
 #include <time.h>
+#include <stdint.h>
 
 #include <sndfile.h>
 #include <samplerate.h>
 
+#include "pbd/gstdio_compat.h"
 #include <glibmm.h>
 
 #include <boost/scoped_array.hpp>
 #include <boost/shared_array.hpp>
 
-#include <pbd/basename.h>
-#include <pbd/convert.h>
-
-#include <ardour/ardour.h>
-#include <ardour/session.h>
-#include <ardour/session_directory.h>
-#include <ardour/audio_diskstream.h>
-#include <ardour/sndfilesource.h>
-#include <ardour/sndfile_helpers.h>
-#include <ardour/audioregion.h>
-#include <ardour/region_factory.h>
-#include <ardour/source_factory.h>
-#include <ardour/resampled_source.h>
+#include "pbd/basename.h"
+#include "pbd/convert.h"
+
+#include "evoral/SMF.hpp"
+
+#include "ardour/analyser.h"
+#include "ardour/ardour.h"
+#include "ardour/audio_diskstream.h"
+#include "ardour/audioengine.h"
+#include "ardour/audioregion.h"
+#include "ardour/import_status.h"
+#include "ardour/region_factory.h"
+#include "ardour/resampled_source.h"
+#include "ardour/runtime_functions.h"
+#include "ardour/session.h"
+#include "ardour/session_directory.h"
+#include "ardour/smf_source.h"
+#include "ardour/sndfile_helpers.h"
+#include "ardour/sndfileimportable.h"
+#include "ardour/sndfilesource.h"
+#include "ardour/source_factory.h"
+#include "ardour/tempo.h"
+
+#ifdef HAVE_COREAUDIO
+#include "ardour/caimportable.h"
+#endif
 
 #include "i18n.h"
 
+using namespace std;
 using namespace ARDOUR;
 using namespace PBD;
 
-std::string
-get_non_existent_filename (const std::string& basename, uint channel, uint channels)
+static boost::shared_ptr<ImportableSource>
+open_importable_source (const string& path, framecnt_t samplerate, ARDOUR::SrcQuality quality)
 {
-       char buf[PATH_MAX+1];
-       bool goodfile = false;
-       string base(basename);
-
-       do {
-               if (channels == 2) {
-                       if (channel == 0) {
-                               snprintf (buf, sizeof(buf), "%s-L.wav", base.c_str());
-                       } else {
-                               snprintf (buf, sizeof(buf), "%s-R.wav", base.c_str());
-                       }
-               } else if (channels > 1) {
-                       snprintf (buf, sizeof(buf), "%s-c%d.wav", base.c_str(), channel+1);
-               } else {
-                       snprintf (buf, sizeof(buf), "%s.wav", base.c_str());
+       /* try libsndfile first, because it can get BWF info from .wav, which ExtAudioFile cannot.
+          We don't necessarily need that information in an ImportableSource, but it keeps the
+          logic the same as in SourceFactory::create()
+       */
+
+       try {
+               boost::shared_ptr<SndFileImportableSource> source(new SndFileImportableSource(path));
+
+               if (source->samplerate() == samplerate) {
+                       return source;
                }
 
-               if (sys::exists (buf)) {
+               /* rewrap as a resampled source */
 
-                       /* if the file already exists, we must come up with
-                        *  a new name for it.  for now we just keep appending
-                        *  _ to basename
-                        */
+               return boost::shared_ptr<ImportableSource>(new ResampledImportableSource(source, samplerate, quality));
+       }
 
-                       base += "_";
+       catch (...) {
 
-               } else {
+#ifdef HAVE_COREAUDIO
+
+               /* libsndfile failed, see if we can use CoreAudio to handle the IO */
+
+               CAImportableSource* src = new CAImportableSource(path);
+               boost::shared_ptr<CAImportableSource> source (src);
 
-                       goodfile = true;
+               if (source->samplerate() == samplerate) {
+                       return source;
                }
 
-       } while ( !goodfile);
+               /* rewrap as a resampled source */
+
+               return boost::shared_ptr<ImportableSource>(new ResampledImportableSource(source, samplerate, quality));
+
+#else
+               throw; // rethrow
+#endif
 
-       return buf;
+       }
 }
 
-void
-write_audio_data_to_new_files (ImportableSource* source, Session::import_status& status,
-               vector<boost::shared_ptr<AudioFileSource> >& newfiles)
+vector<string>
+Session::get_paths_for_new_sources (bool /*allow_replacing*/, const string& import_file_path, uint32_t channels)
+{
+       vector<string> new_paths;
+       const string basename = basename_nosuffix (import_file_path);
+
+       for (uint32_t n = 0; n < channels; ++n) {
+
+               const DataType type = SMFSource::safe_midi_file_extension (import_file_path) ? DataType::MIDI : DataType::AUDIO;
+               string filepath;
+
+               switch (type) {
+                 case DataType::MIDI:
+                               if (channels > 1) {
+                                       string mchn_name = string_compose ("%1-t%2", basename, n);
+                                       filepath = new_midi_source_path (mchn_name);
+                               } else {
+                                       filepath = new_midi_source_path (basename);
+                               }
+                       break;
+               case DataType::AUDIO:
+                       filepath = new_audio_source_path (basename, channels, n, false, false);
+                       break;
+               }
+
+               if (filepath.empty()) {
+                       error << string_compose (_("Cannot find new filename for imported file %1"), import_file_path) << endmsg;
+                       return vector<string>();
+               }
+
+               new_paths.push_back (filepath);
+       }
+
+       return new_paths;
+}
+
+static bool
+map_existing_mono_sources (const vector<string>& new_paths, Session& /*sess*/,
+                           uint32_t /*samplerate*/, vector<boost::shared_ptr<Source> >& newfiles, Session *session)
+{
+       for (vector<string>::const_iterator i = new_paths.begin();
+            i != new_paths.end(); ++i)
+       {
+               boost::shared_ptr<Source> source = session->audio_source_by_path_and_channel(*i, 0);
+
+               if (source == 0) {
+                       error << string_compose(_("Could not find a source for %1 even though we are updating this file!"), (*i)) << endl;
+                       return false;
+               }
+
+               newfiles.push_back(boost::dynamic_pointer_cast<Source>(source));
+       }
+       return true;
+}
+
+static bool
+create_mono_sources_for_writing (const vector<string>& new_paths,
+                                 Session& sess, uint32_t samplerate,
+                                 vector<boost::shared_ptr<Source> >& newfiles,
+                                 framepos_t timeline_position)
+{
+       for (vector<string>::const_iterator i = new_paths.begin(); i != new_paths.end(); ++i) {
+
+               boost::shared_ptr<Source> source;
+
+               try {
+                       const DataType type = SMFSource::safe_midi_file_extension (*i) ? DataType::MIDI : DataType::AUDIO;
+
+                       source = SourceFactory::createWritable (type, sess,
+                                                               i->c_str(),
+                                                               false, // destructive
+                                                               samplerate);
+               }
+
+               catch (const failed_constructor& err) {
+                       error << string_compose (_("Unable to create file %1 during import"), *i) << endmsg;
+                       return false;
+               }
+
+               newfiles.push_back(boost::dynamic_pointer_cast<Source>(source));
+
+               /* for audio files, reset the timeline position so that any BWF-ish
+                  information in the original files we are importing from is maintained.
+               */
+
+               boost::shared_ptr<AudioFileSource> afs;
+               if ((afs = boost::dynamic_pointer_cast<AudioFileSource>(source)) != 0) {
+                       afs->set_timeline_position(timeline_position);
+               }
+       }
+       return true;
+}
+
+static string
+compose_status_message (const string& path,
+                        uint32_t file_samplerate,
+                        uint32_t session_samplerate,
+                        uint32_t /* current_file */,
+                        uint32_t /* total_files */)
+{
+       if (file_samplerate != session_samplerate) {
+               return string_compose (_("Resampling %1 from %2kHz to %3kHz"),
+                                      Glib::path_get_basename (path),
+                                      file_samplerate/1000.0f,
+                                      session_samplerate/1000.0f);
+       }
+
+       return string_compose (_("Copying %1"), Glib::path_get_basename (path));
+}
+
+static void
+write_audio_data_to_new_files (ImportableSource* source, ImportStatus& status,
+                               vector<boost::shared_ptr<Source> >& newfiles)
 {
-       const nframes_t nframes = ResampledImportableSource::blocksize;
-       uint channels = source->channels();
+       const framecnt_t nframes = ResampledImportableSource::blocksize;
+       boost::shared_ptr<AudioFileSource> afs;
+       uint32_t channels = source->channels();
+       if (channels == 0) {
+               return;
+       }
 
        boost::scoped_array<float> data(new float[nframes * channels]);
        vector<boost::shared_array<Sample> > channel_data;
 
-       for (uint n = 0; n < channels; ++n) {
+       for (uint32_t n = 0; n < channels; ++n) {
                channel_data.push_back(boost::shared_array<Sample>(new Sample[nframes]));
        }
-       
-       uint read_count = 0;
+
+       float gain = 1;
+
+       boost::shared_ptr<AudioSource> s = boost::dynamic_pointer_cast<AudioSource> (newfiles[0]);
+       assert (s);
+
        status.progress = 0.0f;
+       float progress_multiplier = 1;
+       float progress_base = 0;
+
+       if (!source->clamped_at_unity() && s->clamped_at_unity()) {
+
+               /* The source we are importing from can return sample values with a magnitude greater than 1,
+                  and the file we are writing the imported data to cannot handle such values.  Compute the gain
+                  factor required to normalize the input sources to have a magnitude of less than 1.
+               */
+
+               float peak = 0;
+               uint32_t read_count = 0;
+
+               while (!status.cancel) {
+                       framecnt_t const nread = source->read (data.get(), nframes);
+                       if (nread == 0) {
+                               break;
+                       }
+
+                       peak = compute_peak (data.get(), nread, peak);
+
+                       read_count += nread;
+                       status.progress = 0.5 * read_count / (source->ratio() * source->length() * channels);
+               }
+
+               if (peak >= 1) {
+                       /* we are out of range: compute a gain to fix it */
+                       gain = (1 - FLT_EPSILON) / peak;
+               }
+
+               source->seek (0);
+               progress_multiplier = 0.5;
+               progress_base = 0.5;
+       }
+
+       framecnt_t read_count = 0;
 
        while (!status.cancel) {
 
-               nframes_t nread, nfread;
-               uint x;
-               uint chn;
+               framecnt_t nread, nfread;
+               uint32_t x;
+               uint32_t chn;
 
                if ((nread = source->read (data.get(), nframes)) == 0) {
+#ifdef PLATFORM_WINDOWS
+                       /* Flush the data once we've finished importing the file. Windows can  */
+                       /* cache the data for very long periods of time (perhaps not writing   */
+                       /* it to disk until Ardour closes). So let's force it to flush now.    */
+                       for (chn = 0; chn < channels; ++chn)
+                               if ((afs = boost::dynamic_pointer_cast<AudioFileSource>(newfiles[chn])) != 0)
+                                       afs->flush ();
+#endif
                        break;
                }
+
+               if (gain != 1) {
+                       /* here is the gain fix for out-of-range sample values that we computed earlier */
+                       apply_gain_to_buffer (data.get(), nread, gain);
+               }
+
                nfread = nread / channels;
 
                /* de-interleave */
 
                for (chn = 0; chn < channels; ++chn) {
 
-                       nframes_t n;
+                       framecnt_t n;
                        for (x = chn, n = 0; n < nfread; x += channels, ++n) {
                                channel_data[chn][n] = (Sample) data[x];
                        }
@@ -133,139 +326,274 @@ write_audio_data_to_new_files (ImportableSource* source, Session::import_status&
                /* flush to disk */
 
                for (chn = 0; chn < channels; ++chn) {
-                       newfiles[chn]->write (channel_data[chn].get(), nfread);
+                       if ((afs = boost::dynamic_pointer_cast<AudioFileSource>(newfiles[chn])) != 0) {
+                               afs->write (channel_data[chn].get(), nfread);
+                       }
                }
 
                read_count += nread;
-               status.progress = read_count / (source->ratio () * source->length() * channels);
+               status.progress = progress_base + progress_multiplier * read_count / (source->ratio () * source->length() * channels);
        }
 }
 
-int
-Session::import_audiofile (import_status& status)
+static void
+write_midi_data_to_new_files (Evoral::SMF* source, ImportStatus& status,
+                              vector<boost::shared_ptr<Source> >& newfiles)
 {
-       vector<boost::shared_ptr<AudioFileSource> > newfiles;
-       SF_INFO info;
-       int nfiles = 0;
-       string basepath;
-       int ret = -1;
-       vector<string> new_paths;
-       struct tm* now;
-       uint32_t cnt = 1;
+       uint32_t buf_size = 4;
+       uint8_t* buf      = (uint8_t*) malloc (buf_size);
 
-       status.sources.clear ();
-       
-       for (vector<Glib::ustring>::iterator p = status.paths.begin(); p != status.paths.end(); ++p, ++cnt) {
+       status.progress = 0.0f;
 
-               boost::shared_ptr<SNDFILE> in (sf_open (p->c_str(), SFM_READ, &info), sf_close);
+       assert (newfiles.size() == source->num_tracks());
 
-               if (!in) {
-                       error << string_compose(_("Import: cannot open input sound file \"%1\""), (*p)) << endmsg;
-                       status.done = 1;
-                       status.cancel = 1;
-                       return -1;
-               }
-       
-               boost::scoped_ptr<ImportableSource> importable;
+       try {
+               vector<boost::shared_ptr<Source> >::iterator s = newfiles.begin();
 
-               if ((nframes_t) info.samplerate != frame_rate()) {
-                       importable.reset(new ResampledImportableSource (in.get(), &info, frame_rate(), status.quality));
-               } else {
-                       importable.reset(new ImportableSource (in.get(), &info));
-               }
-               
-               newfiles.clear ();
+               for (unsigned i = 1; i <= source->num_tracks(); ++i) {
 
-               for (int n = 0; n < info.channels; ++n) {
-                       newfiles.push_back (boost::shared_ptr<AudioFileSource>());
-               }
+                       boost::shared_ptr<SMFSource> smfs = boost::dynamic_pointer_cast<SMFSource> (*s);
+
+                       Glib::Threads::Mutex::Lock source_lock(smfs->mutex());
+
+                       smfs->drop_model (source_lock);
+                       source->seek_to_track (i);
+
+                       uint64_t t       = 0;
+                       uint32_t delta_t = 0;
+                       uint32_t size    = 0;
+                       bool first = true;
+
+                       while (!status.cancel) {
+                               gint note_id_ignored; // imported files either don't have NoteID's or we ignore them.
+
+                               size = buf_size;
+
+                               int ret = source->read_event (&delta_t, &size, &buf, &note_id_ignored);
 
-               SessionDirectory sdir(get_best_session_directory_for_new_source ());
+                               if (size > buf_size) {
+                                       buf_size = size;
+                               }
 
-               basepath = PBD::basename_nosuffix ((*p));
-               
-               for (int n = 0; n < info.channels; ++n) {
+                               if (ret < 0) { // EOT
+                                       break;
+                               }
 
-                       std::string filename = get_non_existent_filename (basepath, n, info.channels); 
+                               t += delta_t;
 
-                       sys::path filepath = sdir.sound_path() / filename;
+                               if (ret == 0) { // Meta
+                                       continue;
+                               }
 
-                       try { 
-                               newfiles[n] = boost::dynamic_pointer_cast<AudioFileSource> (SourceFactory::createWritable (DataType::AUDIO, *this, filepath.to_string().c_str(), false, frame_rate()));
+                               if (first) {
+                                       smfs->mark_streaming_write_started (source_lock);
+                                       first = false;
+                               }
+
+                               smfs->append_event_beats(
+                                       source_lock,
+                                       Evoral::Event<Evoral::Beats>(
+                                               0,
+                                               Evoral::Beats::ticks_at_rate(t, source->ppqn()),
+                                               size,
+                                               buf));
+
+                               if (status.progress < 0.99) {
+                                       status.progress += 0.01;
+                               }
                        }
 
-                       catch (failed_constructor& err) {
-                               error << string_compose(_("Session::import_audiofile: cannot open new file source for channel %1"), n+1) << endmsg;
-                               goto out;
+                       if (!first) {
+
+                               /* we wrote something */
+
+                               const framepos_t     pos          = 0;
+                               const Evoral::Beats  length_beats = Evoral::Beats::ticks_at_rate(t, source->ppqn());
+                               BeatsFramesConverter converter(smfs->session().tempo_map(), pos);
+                               smfs->update_length(pos + converter.to(length_beats.round_up_to_beat()));
+                               smfs->mark_streaming_write_completed (source_lock);
+
+                               if (status.cancel) {
+                                       break;
+                               }
+                       } else {
+                               info << string_compose (_("Track %1 of %2 contained no usable MIDI data"), i, source->num_tracks()) << endmsg;
                        }
 
-                       new_paths.push_back (filepath.to_string());
-                       newfiles[n]->prepare_for_peakfile_writes ();
-                       nfiles++;
+                       ++s; // next source
                }
 
-               if ((nframes_t) info.samplerate != frame_rate()) {
-                       status.doing_what = string_compose (_("converting %1\n(resample from %2KHz to %3KHz)\n(%4 of %5)"),
-                                                           basepath,
-                                                           info.samplerate/1000.0f,
-                                                           frame_rate()/1000.0f,
-                                                           cnt, status.paths.size());
-                                                           
+       } catch (exception& e) {
+               error << string_compose (_("MIDI file could not be written (best guess: %1)"), e.what()) << endmsg;
+       }
+
+       if (buf) {
+               free (buf);
+       }
+}
+
+static void
+remove_file_source (boost::shared_ptr<Source> source)
+{
+       boost::shared_ptr<FileSource> fs = boost::dynamic_pointer_cast<FileSource> (source);
+
+       fs->DropReferences ();
+
+       if (fs) {
+               ::g_unlink (fs->path().c_str());
+       }
+}
+
+// This function is still unable to cleanly update an existing source, even though
+// it is possible to set the ImportStatus flag accordingly. The functinality
+// is disabled at the GUI until the Source implementations are able to provide
+// the necessary API.
+void
+Session::import_files (ImportStatus& status)
+{
+       typedef vector<boost::shared_ptr<Source> > Sources;
+       Sources all_new_sources;
+       boost::shared_ptr<AudioFileSource> afs;
+       boost::shared_ptr<SMFSource> smfs;
+       uint32_t channels = 0;
+
+       status.sources.clear ();
+
+       for (vector<string>::iterator p = status.paths.begin();
+            p != status.paths.end() && !status.cancel;
+            ++p)
+       {
+               boost::shared_ptr<ImportableSource> source;
+               std::auto_ptr<Evoral::SMF>          smf_reader;
+               const DataType type = SMFSource::safe_midi_file_extension (*p) ? DataType::MIDI : DataType::AUDIO;
+
+               if (type == DataType::AUDIO) {
+                       try {
+                               source = open_importable_source (*p, frame_rate(), status.quality);
+                               channels = source->channels();
+                       } catch (const failed_constructor& err) {
+                               error << string_compose(_("Import: cannot open input sound file \"%1\""), (*p)) << endmsg;
+                               status.done = status.cancel = true;
+                               return;
+                       }
+
                } else {
-                       status.doing_what = string_compose (_("converting %1\n(%2 of %3)"), 
-                                                           basepath,
-                                                           cnt, status.paths.size());
+                       try {
+                               smf_reader = std::auto_ptr<Evoral::SMF>(new Evoral::SMF());
+                               smf_reader->open(*p);
+                               channels = smf_reader->num_tracks();
+                       } catch (...) {
+                               error << _("Import: error opening MIDI file") << endmsg;
+                               status.done = status.cancel = true;
+                               return;
+                       }
+               }
+
+               if (channels == 0) {
+                       error << _("Import: file contains no channels.") << endmsg;
+                       continue;
+               }
+
+               vector<string> new_paths = get_paths_for_new_sources (status.replace_existing_source, *p, channels);
+               Sources newfiles;
+               framepos_t natural_position = source ? source->natural_position() : 0;
+
 
+               if (status.replace_existing_source) {
+                       fatal << "THIS IS NOT IMPLEMENTED YET, IT SHOULD NEVER GET CALLED!!! DYING!" << endmsg;
+                       status.cancel = !map_existing_mono_sources (new_paths, *this, frame_rate(), newfiles, this);
+               } else {
+                       status.cancel = !create_mono_sources_for_writing (new_paths, *this, frame_rate(), newfiles, natural_position);
                }
 
-               write_audio_data_to_new_files (importable.get(), status, newfiles);
+               // copy on cancel/failure so that any files that were created will be removed below
+               std::copy (newfiles.begin(), newfiles.end(), std::back_inserter(all_new_sources));
 
                if (status.cancel) {
-                       goto out;
+                       break;
                }
-               
-               for (int n = 0; n < info.channels; ++n) {
-                       status.sources.push_back (newfiles[n]);
+
+               for (Sources::iterator i = newfiles.begin(); i != newfiles.end(); ++i) {
+                       if ((afs = boost::dynamic_pointer_cast<AudioFileSource>(*i)) != 0) {
+                               afs->prepare_for_peakfile_writes ();
+                       }
                }
 
-               if (status.cancel) {
-                       goto out;
+               if (source) { // audio
+                       status.doing_what = compose_status_message (*p, source->samplerate(),
+                                                                   frame_rate(), status.current, status.total);
+                       write_audio_data_to_new_files (source.get(), status, newfiles);
+               } else if (smf_reader.get()) { // midi
+                       status.doing_what = string_compose(_("Loading MIDI file %1"), *p);
+                       write_midi_data_to_new_files (smf_reader.get(), status, newfiles);
                }
+
+               ++status.current;
+               status.progress = 0;
        }
-       
-       status.freeze = true;
 
-       time_t xnow;
-       time (&xnow);
-       now = localtime (&xnow);
+       if (!status.cancel) {
+               struct tm* now;
+               time_t xnow;
+               time (&xnow);
+               now = localtime (&xnow);
+               status.freeze = true;
 
-       /* flush the final length(s) to the header(s) */
+               /* flush the final length(s) to the header(s) */
 
-       for (SourceList::iterator x = status.sources.begin(); x != status.sources.end() && !status.cancel; ++x) {
-               boost::dynamic_pointer_cast<AudioFileSource>(*x)->update_header(0, *now, xnow);
-               boost::dynamic_pointer_cast<AudioSource>(*x)->done_with_peakfile_writes ();
-       }
+               for (Sources::iterator x = all_new_sources.begin(); x != all_new_sources.end(); ) {
 
-       /* save state so that we don't lose these new Sources */
+                       if ((afs = boost::dynamic_pointer_cast<AudioFileSource>(*x)) != 0) {
+                               afs->update_header((*x)->natural_position(), *now, xnow);
+                               afs->done_with_peakfile_writes ();
 
-       if (!status.cancel) {
-               save_state (_name);
-       }
+                               /* now that there is data there, requeue the file for analysis */
+
+                               if (Config->get_auto_analyse_audio()) {
+                                       Analyser::queue_source_for_analysis (boost::static_pointer_cast<Source>(*x), false);
+                               }
+                       }
+
+                       /* imported, copied files cannot be written or removed
+                        */
 
-       ret = 0;
+                       boost::shared_ptr<FileSource> fs = boost::dynamic_pointer_cast<FileSource>(*x);
+                       if (fs) {
+                               /* Only audio files should be marked as
+                                  immutable - we may need to rewrite MIDI
+                                  files at any time.
+                               */
+                               if (boost::dynamic_pointer_cast<AudioFileSource> (fs)) {
+                                       fs->mark_immutable ();
+                               } else {
+                                       fs->mark_immutable_except_write ();
+                               }
+                               fs->mark_nonremovable ();
+                       }
 
-  out:
+                       /* don't create tracks for empty MIDI sources (channels) */
 
-       if (status.cancel) {
+                       if ((smfs = boost::dynamic_pointer_cast<SMFSource>(*x)) != 0 && smfs->is_empty()) {
+                               x = all_new_sources.erase(x);
+                       } else {
+                               ++x;
+                       }
+               }
 
-               status.sources.clear ();
+               /* save state so that we don't lose these new Sources */
 
-               for (vector<string>::iterator i = new_paths.begin(); i != new_paths.end(); ++i) {
-                       unlink ((*i).c_str());
+               save_state (_name);
+
+               std::copy (all_new_sources.begin(), all_new_sources.end(), std::back_inserter(status.sources));
+       } else {
+               try {
+                       std::for_each (all_new_sources.begin(), all_new_sources.end(), remove_file_source);
+               } catch (...) {
+                       error << _("Failed to remove some files after failed/cancelled import operation") << endmsg;
                }
+
        }
 
        status.done = true;
-
-       return ret;
 }
+