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audiofilter.cc

/*
    Copyright (C) 2004 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 <time.h>
#include <cerrno>

#include <pbd/basename.h>
#include <ardour/sndfilesource.h>
#include <ardour/session.h>
#include <ardour/audioregion.h>
#include <ardour/audiofilter.h>
#include <ardour/region_factory.h>
#include <ardour/source_factory.h>
#include <ardour/analyser.h>

#include "i18n.h"

using namespace ARDOUR;
using namespace PBD;

int
AudioFilter::make_new_sources (boost::shared_ptr<AudioRegion> region, SourceList& nsrcs, string suffix)
{
      vector<string> names = region->master_source_names();

      if (names.size() != region->n_channels()) {
            warning << _("This is an old session that does not have\n\
sufficient information for rendered FX") << endmsg;
            return -1;
      }

      for (uint32_t i = 0; i < region->n_channels(); ++i) {

            string name = PBD::basename_nosuffix (names[i]);

            /* remove any existing version of suffix by assuming it starts
               with some kind of "special" character.
            */

            if (!suffix.empty()) {
                  string::size_type pos = name.find (suffix[0]);
                  if (pos != string::npos && pos > 2) {
                        name = name.substr (0, pos - 1);
                  }
            }

            string path = session.path_from_region_name (name, suffix);

            if (path.length() == 0) {
                  error << string_compose (_("audiofilter: error creating name for new audio file based on %1"), region->name()) 
                        << endmsg;
                  return -1;
            }

            try {
                  nsrcs.push_back (boost::dynamic_pointer_cast<AudioSource> (SourceFactory::createWritable (session, path, false, session.frame_rate())));
                  nsrcs.back()->prepare_for_peakfile_writes ();
            } 

            catch (failed_constructor& err) {
                  error << string_compose (_("audiofilter: error creating new audio file %1 (%2)"), path, strerror (errno)) << endmsg;
                  return -1;
            }
      }

      return 0;
}

int
AudioFilter::finish (boost::shared_ptr<AudioRegion> region, SourceList& nsrcs, string region_name)
{
      /* update headers on new sources */

      time_t xnow;
      struct tm* now;

      time (&xnow);
      now = localtime (&xnow);

      for (SourceList::iterator si = nsrcs.begin(); si != nsrcs.end(); ++si) {
            boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource>(*si);
            boost::shared_ptr<AudioSource> as = boost::dynamic_pointer_cast<AudioSource>(*si);

            if (as) {
                  as->done_with_peakfile_writes ();
            }

            if (afs) {
                  afs->update_header (region->position(), *now, xnow);
                  afs->mark_immutable ();
            }
            
            /* now that there is data there, requeue the file for analysis */
            
            if (Config->get_auto_analyse_audio()) {
                  Analyser::queue_source_for_analysis (*si, false);
            }
      }


      /* make a new whole-file region that copies almost everything from the old one, but
         uses the new sources (and new length and name)
      */

      boost::shared_ptr<AudioRegion> ar;
      boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource>(nsrcs.front());

      string whole_file_region_name = region_name_from_path (afs->path(), true);

      ar = boost::dynamic_pointer_cast<AudioRegion> (RegionFactory::create 
                                           (nsrcs, 0, nsrcs.front()->length(), whole_file_region_name, 0, 
                                          Region::Flag (Region::WholeFile|Region::DefaultFlags)));
      
      /* now make a copy of the region that copies almost everything from the old one, but
         uses the new sources (and new length and name)
      */

      /* create a new region */

      if (region_name.empty()) {
            region_name = session.new_region_name (region->name());
      }

      results.clear ();

      ar = boost::dynamic_pointer_cast<AudioRegion> (RegionFactory::create 
                                           (region, nsrcs, region_name, 0, region->flags()));

      /* if we changed the length, fix up the envelope */

      if (region->length() != ar->length()) {
            ar->envelope().extend_to (ar->length());
      }

      results.push_back (ar);
      
      return 0;
}

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