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session_timefx.cc

/*
    Copyright (C) 2003 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.

    $Id: session_timefx.cc,v 1.21 2005/05/18 20:24:35 essej Exp $
*/

#include <cerrno>
#include <stdexcept>

#include <pbd/basename.h>

#include <soundtouch/SoundTouch.h>

#include <ardour/session.h>
#include <ardour/audioregion.h>
#include <ardour/filesource.h>
#include <ardour/sndfilesource.h>

#include "i18n.h"

using namespace std;
using namespace ARDOUR;
using namespace soundtouch;

AudioRegion*
Session::tempoize_region (TimeStretchRequest& tsr)
{
      AudioRegion::SourceList sources;
      AudioRegion::SourceList::iterator it;
      AudioRegion* r = 0;
      SoundTouch st;
      string region_name;
      string ident = X_("-TIMEFX-");
      float percentage;
      jack_nframes_t total_frames;
      jack_nframes_t done;

      /* the soundtouch code wants a *tempo* change percentage, which is 
         of opposite sign to the length change.  
      */

      percentage = -tsr.fraction;

      st.setSampleRate (frame_rate());
      st.setChannels (1);
      st.setTempoChange (percentage);
      st.setPitchSemiTones (0);
      st.setRateChange (0);
      
      st.setSetting(SETTING_USE_QUICKSEEK, tsr.quick_seek);
      st.setSetting(SETTING_USE_AA_FILTER, tsr.antialias);

      vector<string> names = tsr.region->master_source_names();

      tsr.progress = 0.0f;
      total_frames = tsr.region->length() * tsr.region->n_channels();
      done = 0;

      for (uint32_t i = 0; i < tsr.region->n_channels(); ++i) {
            string path = path_from_region_name (PBD::basename_nosuffix (names[i]), ident);

            if (path.length() == 0) {
                  error << compose (_("tempoize: error creating name for new audio file based on %1"), tsr.region->name()) 
                        << endmsg;
                  goto out;
            }

            try {
                  sources.push_back(new FileSource (path, frame_rate()));
            } catch (failed_constructor& err) {
                  error << compose (_("tempoize: error creating new audio file %1 (%2)"), path, strerror (errno)) << endmsg;
                  goto out;
            }
      }
      
      try {
            const jack_nframes_t bufsize = 16384;

            for (uint32_t i = 0; i < sources.size(); ++i) {
                  gain_t gain_buffer[bufsize];
                  Sample buffer[bufsize];
                  jack_nframes_t pos = 0;
                  jack_nframes_t this_read = 0;

                  st.clear();
                  while (tsr.running && pos < tsr.region->length()) {
                        jack_nframes_t this_time;
                  
                        this_time = min (bufsize, tsr.region->length() - pos);

                        /* read from the master (original) sources for the region, 
                           not the ones currently in use, in case it's already been 
                           subject to timefx.  */

                        if ((this_read = tsr.region->master_read_at (buffer, buffer, gain_buffer, pos + tsr.region->position(), this_time)) != this_time) {
                              error << compose (_("tempoize: error reading data from %1"), sources[i]->name()) << endmsg;
                              goto out;
                        }
                  
                        pos += this_read;
                        done += this_read;

                        tsr.progress = (float) done / total_frames;
                        
                        st.putSamples (buffer, this_read);
                  
                        while ((this_read = st.receiveSamples (buffer, bufsize)) > 0 && tsr.running) {
                              if (sources[i]->write (buffer, this_read) != this_read) {
                                    error << compose (_("error writing tempo-adjusted data to %1"), sources[i]->name()) << endmsg;
                                    goto out;
                              }
                        }
                  }
            
                  if (tsr.running) {
                        st.flush ();
                  }
            
                  while (tsr.running && (this_read = st.receiveSamples (buffer, bufsize)) > 0) {
                        if (sources[i]->write (buffer, this_read) != this_read) {
                              error << compose (_("error writing tempo-adjusted data to %1"), sources[i]->name()) << endmsg;
                              goto out;
                        }
                  }
            }
      } catch (runtime_error& err) {
            error << _("timefx code failure. please notify ardour-developers.") << endmsg;
            error << err.what() << endmsg;
            goto out;
      }

      time_t now;
      struct tm* xnow;
      time (&now);
      xnow = localtime (&now);

      for (it = sources.begin(); it != sources.end(); ++it) {
            dynamic_cast<FileSource*>(*it)->update_header (0, *xnow, now);
      }

      region_name = tsr.region->name() + X_(".t");

      r = new AudioRegion (sources, 0, sources.front()->length(), region_name,
                  0, AudioRegion::Flag (AudioRegion::DefaultFlags | AudioRegion::WholeFile));


  out:

      if (sources.size()) {

            /* if we failed to complete for any reason, mark the new file 
               for deletion.
            */

            if ((r == 0 || !tsr.running)) {
                  for (it = sources.begin(); it != sources.end(); ++it) {
                        (*it)->mark_for_remove ();
                        delete *it;
                  }
            }
      }
      
      /* if the process was cancelled, delete the region */

      if (!tsr.running) {
            if (r) {
                  delete r;
                  r = 0;
            } 
      }
      
      return r;
}

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