示例#1
0
// returns number of tracks imported
int Importer::Import(wxString fName,
                     TrackFactory *trackFactory,
                     Track *** tracks,
                     Tags *tags,
                     wxString &errorMessage)
{
   AudacityProject *pProj = GetActiveProject();
   pProj->mbBusyImporting = true;

   ImportFileHandle *inFile = NULL;
   int numTracks = 0;

   wxString extension = fName.AfterLast(wxT('.'));

   // This list is used to call plugins in correct order
   ImportPluginList importPlugins;
   ImportPluginList::compatibility_iterator importPluginNode;

   // This list is used to remember plugins that should have been compatible with the file.
   ImportPluginList compatiblePlugins;
   
   // If user explicitly selected a filter,
   // then we should try importing via corresponding plugin first
   wxString type = gPrefs->Read(wxT("/LastOpenType"),wxT(""));
   
   // Not implemented (yet?)
   wxString mime_type = wxT("*");

   // First, add user-selected filter
   bool usersSelectionOverrides;
   gPrefs->Read(wxT("/ExtendedImport/OverrideExtendedImportByOpenFileDialogChoice"), &usersSelectionOverrides, false);

   wxLogDebug(wxT("LastOpenType is %s"),type.c_str());
   wxLogDebug(wxT("OverrideExtendedImportByOpenFileDialogChoice is %i"),usersSelectionOverrides);

   if (usersSelectionOverrides)
   {
      importPluginNode = mImportPluginList->GetFirst();
      while (importPluginNode)
      {
         ImportPlugin *plugin = importPluginNode->GetData();
         if (plugin->GetPluginFormatDescription().CompareTo(type) == 0)
         {
            // This plugin corresponds to user-selected filter, try it first.
            wxLogDebug(wxT("Inserting %s"),plugin->GetPluginStringID().c_str());
            importPlugins.Insert(plugin);
         }
         importPluginNode = importPluginNode->GetNext();
      }
   }

   wxLogMessage(wxT("File name is %s"),(const char *) fName.c_str());
   wxLogMessage(wxT("Mime type is %s"),(const char *) mime_type.Lower().c_str());

   for (size_t i = 0; i < mExtImportItems->Count(); i++)
   {
      ExtImportItem *item = &(*mExtImportItems)[i];
      bool matches_ext = false, matches_mime = false;
      wxLogDebug(wxT("Testing extensions"));
      for (size_t j = 0; j < item->extensions.Count(); j++)
      {
         wxLogDebug(wxT("%s"), (const char *) item->extensions[j].Lower().c_str());
         if (wxMatchWild (item->extensions[j].Lower(),fName.Lower(), false))
         {
            wxLogDebug(wxT("Match!"));
            matches_ext = true;
            break;
         }
      }
      if (item->extensions.Count() == 0)
      {
         wxLogDebug(wxT("Match! (empty list)"));
         matches_ext = true;
      }
      if (matches_ext)
         wxLogDebug(wxT("Testing mime types"));
      else
         wxLogDebug(wxT("Not testing mime types"));
      for (size_t j = 0; matches_ext && j < item->mime_types.Count(); j++)
      {
         if (wxMatchWild (item->mime_types[j].Lower(),mime_type.Lower(), false))
         {
            wxLogDebug(wxT("Match!"));
            matches_mime = true;
            break;
         }
      }
      if (item->mime_types.Count() == 0)
      {
         wxLogDebug(wxT("Match! (empty list)"));
         matches_mime = true;
      }
      if (matches_ext && matches_mime)
      {
         wxLogDebug(wxT("Complete match!"));
         for (size_t j = 0; j < item->filter_objects.Count() && (item->divider < 0 || (int) j < item->divider); j++)
         {
            // the filter_object can be NULL if a suitable importer was not found
            // this happens when we recompile with --without-ffmpeg and there
            // is still ffmpeg in prefs from previous --with-ffmpeg builds
            if (!(item->filter_objects[j]))
               continue;
            wxLogDebug(wxT("Inserting %s"),item->filter_objects[j]->GetPluginStringID().c_str());
            importPlugins.Append(item->filter_objects[j]);
         }
      }
   }

   // Add all plugins that support the extension
   importPluginNode = mImportPluginList->GetFirst();

   // Here we rely on the fact that the first plugin in mImportPluginList is libsndfile.
   // We want to save this for later insertion ahead of libmad, if libmad supports the extension.
   // The order of plugins in mImportPluginList is determined by the Importer constructor alone and
   // is not changed by user selection overrides or any other mechanism, but we include an assert
   // in case subsequent code revisions to the constructor should break this assumption that 
   // libsndfile is first. 
   ImportPlugin *libsndfilePlugin = importPluginNode->GetData();
   wxASSERT(libsndfilePlugin->GetPluginStringID().IsSameAs(wxT("libsndfile")));

   while (importPluginNode)
   {
      ImportPlugin *plugin = importPluginNode->GetData();
      // Make sure its not already in the list
      if (importPlugins.Find(plugin) == NULL)
      {
         if (plugin->SupportsExtension(extension))
         {
            // If libmad is accidentally fed a wav file which has been incorrectly
            // given an .mp3 extension then it can choke on the contents and crash.
            // To avoid this, put libsndfile ahead of libmad in the lists created for 
            // mp3 files, or for any of the extensions supported by libmad. 
            // A genuine .mp3 file will first fail an attempted import with libsndfile
            // but then get processed as desired by libmad.
            // But a wav file which bears an incorrect .mp3 extension will be successfully 
            // processed by libsndfile and thus avoid being submitted to libmad.
            if (plugin->GetPluginStringID().IsSameAs(wxT("libmad")))
            {
               // Make sure libsndfile is not already in the list
               if (importPlugins.Find(libsndfilePlugin) == NULL)
               {
                  wxLogDebug(wxT("Appending %s"),libsndfilePlugin->GetPluginStringID().c_str());
                  importPlugins.Append(libsndfilePlugin);
               }
            }
            wxLogDebug(wxT("Appending %s"),plugin->GetPluginStringID().c_str());
            importPlugins.Append(plugin);
         }
      }

      importPluginNode = importPluginNode->GetNext();
   }

   // Add remaining plugins, except for libmad, which should not be used as a fallback for anything.
   // Otherwise, if FFmpeg (libav) has not been installed, libmad will still be there near the 
   // end of the preference list importPlugins, where it will claim success importing FFmpeg file
   // formats unsuitable for it, and produce distorted results.
   importPluginNode = mImportPluginList->GetFirst();
   while (importPluginNode)
   {
      ImportPlugin *plugin = importPluginNode->GetData();
      if (!(plugin->GetPluginStringID().IsSameAs(wxT("libmad"))))
      {
         // Make sure its not already in the list
         if (importPlugins.Find(plugin) == NULL)
         {
            wxLogDebug(wxT("Appending %s"),plugin->GetPluginStringID().c_str());
            importPlugins.Append(plugin);
         }
      }

      importPluginNode = importPluginNode->GetNext();
   }

   importPluginNode = importPlugins.GetFirst();
   while(importPluginNode)
   {
      ImportPlugin *plugin = importPluginNode->GetData();
      // Try to open the file with this plugin (probe it)
      wxLogMessage(wxT("Opening with %s"),plugin->GetPluginStringID().c_str());
      inFile = plugin->Open(fName);
      if ( (inFile != NULL) && (inFile->GetStreamCount() > 0) )
      {
         wxLogMessage(wxT("Open(%s) succeeded"),(const char *) fName.c_str());
         // File has more than one stream - display stream selector
         if (inFile->GetStreamCount() > 1)                                                  
         {
            ImportStreamDialog ImportDlg(inFile, NULL, -1, _("Select stream(s) to import"));

            if (ImportDlg.ShowModal() == wxID_CANCEL)
            {
               delete inFile;
               pProj->mbBusyImporting = false;
               return 0;
            }
         }
         // One stream - import it by default
         else
            inFile->SetStreamUsage(0,TRUE);

         int res;
         
         res = inFile->Import(trackFactory, tracks, &numTracks, tags);

         delete inFile;

         if (res == eProgressSuccess || res == eProgressStopped)
         {
            // LOF ("list-of-files") has different semantics
            if (extension.IsSameAs(wxT("lof"), false))
            {
               pProj->mbBusyImporting = false;
               return 1;
            }

            if (numTracks > 0) 
            {
               // success!
               pProj->mbBusyImporting = false;
               return numTracks;
            }
         }

         if (res == eProgressCancelled || res == eProgressFailed)
         {
            pProj->mbBusyImporting = false;
            return 0;
         }

         // We could exit here since we had a match on the file extension,
         // but there may be another plug-in that can import the file and
         // that may recognize the extension, so we allow the loop to
         // continue.
      }
      importPluginNode = importPluginNode->GetNext();
   }
   wxLogError(wxT("Importer::Import: Opening failed."));

   // None of our plugins can handle this file.  It might be that
   // Audacity supports this format, but support was not compiled in.
   // If so, notify the user of this fact
   UnusableImportPluginList::compatibility_iterator unusableImporterNode
      = mUnusableImportPluginList->GetFirst();
   while(unusableImporterNode)
   {
      UnusableImportPlugin *unusableImportPlugin = unusableImporterNode->GetData();
      if( unusableImportPlugin->SupportsExtension(extension) )
      {
         errorMessage.Printf(_("This version of Audacity was not compiled with %s support."),
                             unusableImportPlugin->
                             GetPluginFormatDescription().c_str());
         pProj->mbBusyImporting = false;
         return 0;
      }
      unusableImporterNode = unusableImporterNode->GetNext();
   }

   /* warnings for unsupported data types */

#ifdef USE_MIDI
   // MIDI files must be imported, not opened
   if ((extension.IsSameAs(wxT("midi"), false))||(extension.IsSameAs(wxT("mid"), false))) {
      errorMessage.Printf(_("\"%s\" \nis a MIDI file, not an audio file. \nAudacity cannot open this type of file for playing, but you can\nedit it by clicking File > Import > MIDI."), fName.c_str());
      pProj->mbBusyImporting = false;
      return 0;
   }
#endif

   if (compatiblePlugins.GetCount() <= 0)
   {
      // if someone has sent us a .cda file, send them away
      if (extension.IsSameAs(wxT("cda"), false)) {
         /* i18n-hint: %s will be the filename */
         errorMessage.Printf(_("\"%s\" is an audio CD track. \nAudacity cannot open audio CDs directly. \nExtract (rip) the CD tracks to an audio format that \nAudacity can import, such as WAV or AIFF."), fName.c_str());
         pProj->mbBusyImporting = false;
         return 0;
      }
   
      // playlist type files
      if ((extension.IsSameAs(wxT("m3u"), false))||(extension.IsSameAs(wxT("ram"), false))||(extension.IsSameAs(wxT("pls"), false))) {
         errorMessage.Printf(_("\"%s\" is a playlist file. \nAudacity cannot open this file because it only contains links to other files. \nYou may be able to open it in a text editor and download the actual audio files."), fName.c_str());
         pProj->mbBusyImporting = false;
         return 0;
      }
      //WMA files of various forms
      if ((extension.IsSameAs(wxT("wma"), false))||(extension.IsSameAs(wxT("asf"), false))) {
         errorMessage.Printf(_("\"%s\" is a Windows Media Audio file. \nAudacity cannot open this type of file due to patent restrictions. \nYou need to convert it to a supported audio format, such as WAV or AIFF."), fName.c_str());
         pProj->mbBusyImporting = false;
         return 0;
      }
      //AAC files of various forms (probably not encrypted)
      if ((extension.IsSameAs(wxT("aac"), false))||(extension.IsSameAs(wxT("m4a"), false))||(extension.IsSameAs(wxT("m4r"), false))||(extension.IsSameAs(wxT("mp4"), false))) {
         errorMessage.Printf(_("\"%s\" is an Advanced Audio Coding file. \nAudacity cannot open this type of file. \nYou need to convert it to a supported audio format, such as WAV or AIFF."), fName.c_str());
         pProj->mbBusyImporting = false;
         return 0;
      }
      // encrypted itunes files
      if ((extension.IsSameAs(wxT("m4p"), false))) {
         errorMessage.Printf(_("\"%s\" is an encrypted audio file. \nThese typically are from an online music store. \nAudacity cannot open this type of file due to the encryption. \nTry recording the file into Audacity, or burn it to audio CD then \nextract the CD track to a supported audio format such as WAV or AIFF."), fName.c_str());
         pProj->mbBusyImporting = false;
         return 0;
      }
      // Real Inc. files of various sorts
      if ((extension.IsSameAs(wxT("ra"), false))||(extension.IsSameAs(wxT("rm"), false))||(extension.IsSameAs(wxT("rpm"), false))) {
         errorMessage.Printf(_("\"%s\" is a RealPlayer media file. \nAudacity cannot open this proprietary format. \nYou need to convert it to a supported audio format, such as WAV or AIFF."), fName.c_str());
         pProj->mbBusyImporting = false;
         return 0;
      }
   
      // Other notes-based formats
      if ((extension.IsSameAs(wxT("kar"), false))||(extension.IsSameAs(wxT("mod"), false))||(extension.IsSameAs(wxT("rmi"), false))) {
         errorMessage.Printf(_("\"%s\" is a notes-based file, not an audio file. \nAudacity cannot open this type of file. \nTry converting it to an audio file such as WAV or AIFF and \nthen import it, or record it into Audacity."), fName.c_str());
         pProj->mbBusyImporting = false;
         return 0;
      }
   
      // MusePack files
      if ((extension.IsSameAs(wxT("mp+"), false))||(extension.IsSameAs(wxT("mpc"), false))||(extension.IsSameAs(wxT("mpp"), false))) {
         errorMessage.Printf(_("\"%s\" is a Musepack audio file. \nAudacity cannot open this type of file. \nIf you think it might be an mp3 file, rename it to end with \".mp3\" \nand try importing it again. Otherwise you need to convert it to a supported audio \nformat, such as WAV or AIFF."), fName.c_str());
         pProj->mbBusyImporting = false;
         return 0;
      }
   
      // WavPack files
      if ((extension.IsSameAs(wxT("wv"), false))||(extension.IsSameAs(wxT("wvc"), false))) {
         errorMessage.Printf(_("\"%s\" is a Wavpack audio file. \nAudacity cannot open this type of file. \nYou need to convert it to a supported audio format, such as WAV or AIFF."), fName.c_str());
         pProj->mbBusyImporting = false;
         return 0;
      }
   
      // AC3 files
      if ((extension.IsSameAs(wxT("ac3"), false))) {
         errorMessage.Printf(_("\"%s\" is a Dolby Digital audio file. \nAudacity cannot currently open this type of file. \nYou need to convert it to a supported audio format, such as WAV or AIFF."), fName.c_str());
         pProj->mbBusyImporting = false;
         return 0;
      }
   
      // Speex files
      if ((extension.IsSameAs(wxT("spx"), false))) {
         errorMessage.Printf(_("\"%s\" is an Ogg Speex audio file. \nAudacity cannot currently open this type of file. \nYou need to convert it to a supported audio format, such as WAV or AIFF."), fName.c_str());
         pProj->mbBusyImporting = false;
         return 0;
      }
   
      // Video files of various forms
      if ((extension.IsSameAs(wxT("mpg"), false))||(extension.IsSameAs(wxT("mpeg"), false))||(extension.IsSameAs(wxT("avi"), false))||(extension.IsSameAs(wxT("wmv"), false))||(extension.IsSameAs(wxT("rv"), false))) {
         errorMessage.Printf(_("\"%s\" is a video file. \nAudacity cannot currently open this type of file. \nYou need to extract the audio to a supported format, such as WAV or AIFF."), fName.c_str());
         pProj->mbBusyImporting = false;
         return 0;
      }

      // we were not able to recognize the file type
      errorMessage.Printf(_("Audacity did not recognize the type of the file '%s'.\nIf it is uncompressed, try importing it using \"Import Raw\"."),fName.c_str());
   }
   else
   {
      // We DO have a plugin for this file, but import failed.
      wxString pluglist = wxEmptyString;

      importPluginNode = compatiblePlugins.GetFirst();
      while(importPluginNode)
      {
         ImportPlugin *plugin = importPluginNode->GetData();
         if (pluglist == wxEmptyString)
           pluglist = plugin->GetPluginFormatDescription();
         else
           pluglist = pluglist + wxT(", ") + plugin->GetPluginFormatDescription();
         importPluginNode = importPluginNode->GetNext();
      }

      errorMessage.Printf(_("Audacity recognized the type of the file '%s'.\nImporters supposedly supporting such files are:\n%s,\nbut none of them understood this file format."),fName.c_str(), pluglist.c_str());
   }

   pProj->mbBusyImporting = false;
   return 0;
}
示例#2
0
// returns number of tracks imported
int Importer::Import(wxString fName,
                     TrackFactory *trackFactory,
                     Track *** tracks,
                     Tags *tags,
                     wxString &errorMessage)
{
   ImportFileHandle *inFile = NULL;
   int numTracks = 0;

   wxString extension = fName.AfterLast(wxT('.'));

   // This list is used to call plugins in correct order
   ImportPluginList importPlugins;
   ImportPluginList::compatibility_iterator importPluginNode;

   // This list is used to remember plugins that should have been compatible with the file.
   ImportPluginList compatiblePlugins;
   
   // If user explicitly selected a filter,
   // then we should try importing via corresponding plugin first
   wxString type = gPrefs->Read(wxT("/LastOpenType"),wxT(""));
   
   // Not implemented (yet?)
   wxString mime_type = wxT("*");

   // First, add user-selected filter
   bool usersSelectionOverrides;
   // False if override filter is not found
   bool foundOverride = false;
   gPrefs->Read(wxT("/ExtendedImport/OverrideExtendedImportByOpenFileDialogChoice"), &usersSelectionOverrides, false);
   wxLogDebug(wxT("LastOpenType is %s"),type.c_str());
   wxLogDebug(wxT("OverrideExtendedImportByOpenFileDialogChoice is %i"),usersSelectionOverrides);
   if (usersSelectionOverrides)
   {
      
      importPluginNode = mImportPluginList->GetFirst();
      while(importPluginNode)
      {
         ImportPlugin *plugin = importPluginNode->GetData();
         if (plugin->GetPluginFormatDescription().CompareTo(type) == 0)
         {
            // This plugin corresponds to user-selected filter, try it first.
            wxLogDebug(wxT("Inserting %s"),plugin->GetPluginStringID().c_str());
            importPlugins.Insert(plugin);
            foundOverride = true;
         }
         importPluginNode = importPluginNode->GetNext();
      }
   }
   bool foundItem = false;
   wxLogMessage(wxT("File name is %s"),fName.Lower().c_str());
   wxLogMessage(wxT("Mime type is %s"),mime_type.Lower().c_str());
   for (size_t i = 0; i < mExtImportItems->Count(); i++)
   {
      ExtImportItem *item = &(*mExtImportItems)[i];
      bool matches_ext = false, matches_mime = false;
      wxLogDebug(wxT("Testing extensions"));
      for (size_t j = 0; j < item->extensions.Count(); j++)
      {
         wxLogDebug(wxT("%s"),item->extensions[j].Lower().c_str());
         if (wxMatchWild (item->extensions[j].Lower(),fName.Lower(), false))
         {
            wxLogDebug(wxT("Match!"));
            matches_ext = true;
            break;
         }
      }
      if (item->extensions.Count() == 0)
      {
         wxLogDebug(wxT("Match! (empty list)"));
         matches_ext = true;
      }
      if (matches_ext)
         wxLogDebug(wxT("Testing mime types"));
      else
         wxLogDebug(wxT("Not testing mime types"));
      for (size_t j = 0; matches_ext && j < item->mime_types.Count(); j++)
      {
         if (wxMatchWild (item->mime_types[j].Lower(),mime_type.Lower(), false))
         {
            wxLogDebug(wxT("Match!"));
            matches_mime = true;
            break;
         }
      }
      if (item->mime_types.Count() == 0)
      {
         wxLogDebug(wxT("Match! (empty list)"));
         matches_mime = true;
      }
      if (matches_ext && matches_mime)
      {
         wxLogDebug(wxT("Complete match!"));
         for (size_t j = 0; j < item->filter_objects.Count() && (item->divider < 0 || (int) j < item->divider); j++)
         {
            wxLogDebug(wxT("Inserting %s"),item->filter_objects[j]->GetPluginStringID().c_str());
            importPlugins.Append(item->filter_objects[j]);
         }
         foundItem = true;
      }
   }

   if (!foundItem || (usersSelectionOverrides && !foundOverride))
   {
      bool prioritizeMp3 = false;
      if (usersSelectionOverrides && !foundOverride)
         importPlugins.Clear();
      wxLogDebug(wxT("Applying default rule"));
      // Special treatment for mp3 files
      if (wxMatchWild (wxT("*.mp3"),fName.Lower(), false))
         prioritizeMp3 = true;
      // By default just add all plugins (except for MP3)
      importPluginNode = mImportPluginList->GetFirst();
      while(importPluginNode)
      {
         ImportPlugin *plugin = importPluginNode->GetData();
         if (importPlugins.Find(plugin) == NULL)
         {
            // Skip MP3 import plugin. Opens some non-mp3 audio files (ac3 for example) as garbage.
            if (plugin->GetPluginFormatDescription().CompareTo( _("MP3 files") ) != 0)
            {
               wxLogDebug(wxT("Inserting %s"),plugin->GetPluginStringID().c_str());
               importPlugins.Append(plugin);
            }
            else if (prioritizeMp3)
            {
               if (usersSelectionOverrides)
               {
                  wxLogDebug(wxT("Inserting %s at 1"),plugin->GetPluginStringID().c_str());
                  importPlugins.Insert((size_t) 1, plugin);
               }
               else
               {
                  wxLogDebug(wxT("Inserting %s at 0"),plugin->GetPluginStringID().c_str());
                  importPlugins.Insert((size_t) 0, plugin);
               }
            }
         }
         importPluginNode = importPluginNode->GetNext();
      }
   }

   importPluginNode = importPlugins.GetFirst();
   while(importPluginNode)
   {
      ImportPlugin *plugin = importPluginNode->GetData();
      // Try to open the file with this plugin (probe it)
      wxLogMessage(wxT("Opening with %s"),plugin->GetPluginStringID().c_str());
      inFile = plugin->Open(fName);
      if ( (inFile != NULL) && (inFile->GetStreamCount() > 0) )
      {
         wxLogMessage(wxT("Open(%s) succeeded"), fName.Lower().c_str());
         // File has more than one stream - display stream selector
         if (inFile->GetStreamCount() > 1)                                                  
         {
            ImportStreamDialog ImportDlg(inFile, NULL, -1, _("Select stream(s) to import"));

            if (ImportDlg.ShowModal() == wxID_CANCEL)
            {
               delete inFile;
               return 0;
            }
         }
         // One stream - import it by default
         else
            inFile->SetStreamUsage(0,TRUE);

         int res;
         
         res = inFile->Import(trackFactory, tracks, &numTracks, tags);

         delete inFile;

         if (res == eProgressSuccess || res == eProgressStopped)
         {
            // LOF ("list-of-files") has different semantics
            if (extension.IsSameAs(wxT("lof"), false))
               return 1;

            if (numTracks > 0) {
               // success!
               return numTracks;
            }
         }

         if (res == eProgressCancelled || res == eProgressFailed)
         {
            return 0;
         }

         // We could exit here since we had a match on the file extension,
         // but there may be another plug-in that can import the file and
         // that may recognize the extension, so we allow the loop to
         // continue.
      }
      importPluginNode = importPluginNode->GetNext();
   }
   wxLogError(wxT("Importer::Import: Opening failed."));
   // None of our plugins can handle this file.  It might be that
   // Audacity supports this format, but support was not compiled in.
   // If so, notify the user of this fact
   UnusableImportPluginList::compatibility_iterator unusableImporterNode
      = mUnusableImportPluginList->GetFirst();
   while(unusableImporterNode)
   {
      UnusableImportPlugin *unusableImportPlugin = unusableImporterNode->GetData();
      if( unusableImportPlugin->SupportsExtension(extension) )
      {
         errorMessage.Printf(_("This version of Audacity was not compiled with %s support."),
                             unusableImportPlugin->
                             GetPluginFormatDescription().c_str());
         return 0;
      }
      unusableImporterNode = unusableImporterNode->GetNext();
   }

   /* warnings for unsupported data types */

#ifdef USE_MIDI
   // MIDI files must be imported, not opened
   if ((extension.IsSameAs(wxT("midi"), false))||(extension.IsSameAs(wxT("mid"), false))) {
      errorMessage.Printf(_("\"%s\" \nis a MIDI file, not an audio file. \nAudacity cannot open this type of file for playing, but you can\nedit it by clicking File > Import > MIDI."), fName.c_str());
      return 0;
   }
#endif

   if (compatiblePlugins.GetCount() <= 0)
   {
      // if someone has sent us a .cda file, send them away
      if (extension.IsSameAs(wxT("cda"), false)) {
         /* i18n-hint: %s will be the filename */
         errorMessage.Printf(_("\"%s\" is an audio CD track. \nAudacity cannot open audio CDs directly. \nExtract (rip) the CD tracks to an audio format that \nAudacity can import, such as WAV or AIFF."), fName.c_str());
         return 0;
      }
   
      // playlist type files
      if ((extension.IsSameAs(wxT("m3u"), false))||(extension.IsSameAs(wxT("ram"), false))||(extension.IsSameAs(wxT("pls"), false))) {
         errorMessage.Printf(_("\"%s\" is a playlist file. \nAudacity cannot open this file because it only contains links to other files. \nYou may be able to open it in a text editor and download the actual audio files."), fName.c_str());
         return 0;
      }
      //WMA files of various forms
      if ((extension.IsSameAs(wxT("wma"), false))||(extension.IsSameAs(wxT("asf"), false))) {
         errorMessage.Printf(_("\"%s\" is a Windows Media Audio file. \nAudacity cannot open this type of file due to patent restrictions. \nYou need to convert it to a supported audio format, such as WAV or AIFF."), fName.c_str());
         return 0;
      }
      //AAC files of various forms (probably not encrypted)
      if ((extension.IsSameAs(wxT("aac"), false))||(extension.IsSameAs(wxT("m4a"), false))||(extension.IsSameAs(wxT("m4r"), false))||(extension.IsSameAs(wxT("mp4"), false))) {
         errorMessage.Printf(_("\"%s\" is an Advanced Audio Coding file. \nAudacity cannot open this type of file. \nYou need to convert it to a supported audio format, such as WAV or AIFF."), fName.c_str());
         return 0;
      }
      // encrypted itunes files
      if ((extension.IsSameAs(wxT("m4p"), false))) {
         errorMessage.Printf(_("\"%s\" is an encrypted audio file. \nThese typically are from an online music store. \nAudacity cannot open this type of file due to the encryption. \nTry recording the file into Audacity, or burn it to audio CD then \nextract the CD track to a supported audio format such as WAV or AIFF."), fName.c_str());
         return 0;
      }
      // Real Inc. files of various sorts
      if ((extension.IsSameAs(wxT("ra"), false))||(extension.IsSameAs(wxT("rm"), false))||(extension.IsSameAs(wxT("rpm"), false))) {
         errorMessage.Printf(_("\"%s\" is a RealPlayer media file. \nAudacity cannot open this proprietary format. \nYou need to convert it to a supported audio format, such as WAV or AIFF."), fName.c_str());
         return 0;
      }
   
      // Other notes-based formats
      if ((extension.IsSameAs(wxT("kar"), false))||(extension.IsSameAs(wxT("mod"), false))||(extension.IsSameAs(wxT("rmi"), false))) {
         errorMessage.Printf(_("\"%s\" is a notes-based file, not an audio file. \nAudacity cannot open this type of file. \nTry converting it to an audio file such as WAV or AIFF and \nthen import it, or record it into Audacity."), fName.c_str());
         return 0;
      }
   
      // MusePack files
      if ((extension.IsSameAs(wxT("mp+"), false))||(extension.IsSameAs(wxT("mpc"), false))||(extension.IsSameAs(wxT("mpp"), false))) {
         errorMessage.Printf(_("\"%s\" is a Musepack audio file. \nAudacity cannot open this type of file. \nIf you think it might be an mp3 file, rename it to end with \".mp3\" \nand try importing it again. Otherwise you need to convert it to a supported audio \nformat, such as WAV or AIFF."), fName.c_str());
         return 0;
      }
   
      // WavPack files
      if ((extension.IsSameAs(wxT("wv"), false))||(extension.IsSameAs(wxT("wvc"), false))) {
         errorMessage.Printf(_("\"%s\" is a Wavpack audio file. \nAudacity cannot open this type of file. \nYou need to convert it to a supported audio format, such as WAV or AIFF."), fName.c_str());
         return 0;
      }
   
      // AC3 files
      if ((extension.IsSameAs(wxT("ac3"), false))) {
         errorMessage.Printf(_("\"%s\" is a Dolby Digital audio file. \nAudacity cannot currently open this type of file. \nYou need to convert it to a supported audio format, such as WAV or AIFF."), fName.c_str());
         return 0;
      }
   
      // Speex files
      if ((extension.IsSameAs(wxT("spx"), false))) {
         errorMessage.Printf(_("\"%s\" is an Ogg Speex audio file. \nAudacity cannot currently open this type of file. \nYou need to convert it to a supported audio format, such as WAV or AIFF."), fName.c_str());
         return 0;
      }
   
      // Video files of various forms
      if ((extension.IsSameAs(wxT("mpg"), false))||(extension.IsSameAs(wxT("mpeg"), false))||(extension.IsSameAs(wxT("avi"), false))||(extension.IsSameAs(wxT("wmv"), false))||(extension.IsSameAs(wxT("rv"), false))) {
         errorMessage.Printf(_("\"%s\" is a video file. \nAudacity cannot currently open this type of file. \nYou need to extract the audio to a supported format, such as WAV or AIFF."), fName.c_str());
         return 0;
      }

      // we were not able to recognize the file type
      errorMessage.Printf(_("Audacity did not recognize the type of the file '%s'.\nIf it is uncompressed, try importing it using \"Import Raw\"."),fName.c_str());
   }
   else
   {
      // We DO have a plugin for this file, but import failed.
      wxString pluglist = wxEmptyString;

      importPluginNode = compatiblePlugins.GetFirst();
      while(importPluginNode)
      {
         ImportPlugin *plugin = importPluginNode->GetData();
         if (pluglist == wxEmptyString)
           pluglist = plugin->GetPluginFormatDescription();
         else
           pluglist = pluglist + wxT(", ") + plugin->GetPluginFormatDescription();
         importPluginNode = importPluginNode->GetNext();
      }

      errorMessage.Printf(_("Audacity recognized the type of the file '%s'.\nImporters supposedly supporting such files are:\n%s,\nbut none of them understood this file format."),fName.c_str(), pluglist.c_str());
   }

   return 0;
}