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rb_effect.cc

/*
    Copyright (C) 2004-2007 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 <algorithm>
#include <cmath>

#include <pbd/error.h>
#include <rubberband/RubberBandStretcher.h>

#include <ardour/types.h>
#include <ardour/stretch.h>
#include <ardour/pitch.h>
#include <ardour/audiofilesource.h>
#include <ardour/session.h>
#include <ardour/audioregion.h>

#include "i18n.h"

using namespace std;
using namespace ARDOUR;
using namespace PBD;
using namespace RubberBand;

Pitch::Pitch (Session& s, TimeFXRequest& req)
      : RBEffect (s, req)
{
}

Stretch::Stretch (Session& s, TimeFXRequest& req)
      : RBEffect (s, req)
{
}

RBEffect::RBEffect (Session& s, TimeFXRequest& req)
      : AudioFilter (s)
      , tsr (req)

{
      tsr.progress = 0.0f;
}

RBEffect::~RBEffect ()
{
}

int
RBEffect::run (boost::shared_ptr<AudioRegion> region)
{
      SourceList nsrcs;
      nframes_t done;
      int ret = -1;
      const nframes_t bufsize = 256;
      gain_t* gain_buffer = 0;
      Sample** buffers = 0;
      char suffix[32];
      string new_name;
      string::size_type at;
      nframes_t pos = 0;
      int avail = 0;

      // note: this_time_fraction is a ratio of original length. 1.0 = no change, 
      // 0.5 is half as long, 2.0 is twice as long, etc.

      double this_time_fraction = tsr.time_fraction * region->stretch ();
      double this_pitch_fraction = tsr.pitch_fraction * region->shift ();

      RubberBandStretcher stretcher (session.frame_rate(), region->n_channels(),
                               (RubberBandStretcher::Options) tsr.opts,
                               this_time_fraction, this_pitch_fraction);
      
      tsr.progress = 0.0f;
      tsr.done = false;

      uint32_t channels = region->n_channels();
      nframes_t duration = region->ancestral_length();

      stretcher.setExpectedInputDuration(duration);
      stretcher.setDebugLevel(1);

      /* the name doesn't need to be super-precise, but allow for 2 fractional
         digits just to disambiguate close but not identical FX
      */

      if (this_time_fraction == 1.0) {
            snprintf (suffix, sizeof (suffix), "@%d", (int) floor (this_pitch_fraction * 100.0f));
      } else if (this_pitch_fraction == 1.0) {
            snprintf (suffix, sizeof (suffix), "@%d", (int) floor (this_time_fraction * 100.0f));
      } else {
            snprintf (suffix, sizeof (suffix), "@%d-%d", 
                    (int) floor (this_time_fraction * 100.0f),
                    (int) floor (this_pitch_fraction * 100.0f));
      }

      /* create new sources */

      if (make_new_sources (region, nsrcs, suffix)) {
            goto out;
      }

      gain_buffer = new gain_t[bufsize];
      buffers = new float *[channels];

      for (uint32_t i = 0; i < channels; ++i) {
            buffers[i] = new float[bufsize];
      }

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

      /* study first, process afterwards. */

      pos = 0;
      avail = 0;
      done = 0;

      try { 
            while (pos < duration && !tsr.cancel) {
                  
                  nframes_t this_read = 0;
                  
                  for (uint32_t i = 0; i < channels; ++i) {
                        
                        this_read = 0;
                        nframes_t this_time;
                        
                        this_time = min(bufsize, duration - pos);
                        
                        this_read = region->master_read_at
                              (buffers[i],
                               buffers[i],
                               gain_buffer,
                               pos + region->position(),
                               this_time,
                               i);
                        
                        if (this_read != this_time) {
                              error << string_compose
                                    (_("tempoize: error reading data from %1 at %2 (wanted %3, got %4)"),
                                     region->name(), pos + region->position(), this_time, this_read) << endmsg;
                              goto out;
                        }
                  }
                  
                  pos += this_read;
                  done += this_read;

                  tsr.progress = ((float) done / duration) * 0.25;

                  stretcher.study(buffers, this_read, pos == duration);
            }
            
            done = 0;
            pos = 0;

            while (pos < duration && !tsr.cancel) {
                  
                  nframes_t this_read = 0;
                  
                  for (uint32_t i = 0; i < channels; ++i) {
                        
                        this_read = 0;
                        nframes_t this_time;
                        
                        this_time = min(bufsize, duration - pos);
                        
                        this_read = region->master_read_at
                              (buffers[i],
                               buffers[i],
                               gain_buffer,
                               pos + region->position(),
                               this_time,
                               i);
                        
                        if (this_read != this_time) {
                              error << string_compose
                                    (_("tempoize: error reading data from %1 at %2 (wanted %3, got %4)"),
                                     region->name(), pos + region->position(), this_time, this_read) << endmsg;
                              goto out;
                        }
                  }

                  pos += this_read;
                  done += this_read;

                  tsr.progress = 0.25 + ((float) done / duration) * 0.75;

                  stretcher.process(buffers, this_read, pos == duration);

                  int avail = 0;

                  while ((avail = stretcher.available()) > 0) {

                        this_read = min(bufsize, uint32_t(avail));

                        stretcher.retrieve(buffers, this_read);
                  
                        for (uint32_t i = 0; i < nsrcs.size(); ++i) {

                              if (nsrcs[i]->write(buffers[i], this_read) !=
                                  this_read) {
                                    error << string_compose (_("error writing tempo-adjusted data to %1"), nsrcs[i]->name()) << endmsg;
                                    goto out;
                              }
                        }
                  }
            }

            while ((avail = stretcher.available()) >= 0) {

                  uint32_t this_read = min(bufsize, uint32_t(avail));

                  stretcher.retrieve(buffers, this_read);

                  for (uint32_t i = 0; i < nsrcs.size(); ++i) {

                        if (nsrcs[i]->write(buffers[i], this_read) !=
                            this_read) {
                              error << string_compose (_("error writing tempo-adjusted data to %1"), nsrcs[i]->name()) << endmsg;
                              goto out;
                        }
                  }
            }

      } catch (runtime_error& err) {
            error << _("timefx code failure. please notify ardour-developers.") << endmsg;
            error << err.what() << endmsg;
            goto out;
      }

      new_name = region->name();
      at = new_name.find ('@');

      // remove any existing stretch indicator

      if (at != string::npos && at > 2) {
            new_name = new_name.substr (0, at - 1);
      }

      new_name += suffix;

      ret = finish (region, nsrcs, new_name);

      /* now reset ancestral data for each new region */

      for (vector<boost::shared_ptr<AudioRegion> >::iterator x = results.begin(); x != results.end(); ++x) {

            (*x)->set_ancestral_data (region->ancestral_start(),
                                region->ancestral_length(),
                                this_time_fraction,
                                this_pitch_fraction );
            (*x)->set_master_sources (region->get_master_sources());
      }

  out:

      if (gain_buffer) {
            delete [] gain_buffer;
      }

      if (buffers) {
            for (uint32_t i = 0; i < channels; ++i) {
                  delete buffers[i];
            }
            delete [] buffers;
      }

      if (ret || tsr.cancel) {
            for (SourceList::iterator si = nsrcs.begin(); si != nsrcs.end(); ++si) {
                  (*si)->mark_for_remove ();
            }
      }
      
      tsr.done = true;

      return ret;
}




    

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