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editor_timefx.cc

/*
    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 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: editor_timefx.cc,v 1.12 2005/05/05 19:38:54 pauld Exp $
*/

#include <cstdlib>
#include <cmath>

#include <string>

#include <pbd/error.h>
#include <pbd/pthread_utils.h>

#include "editor.h"
#include "audio_time_axis.h"
#include "regionview.h"
#include "region_selection.h"

#include <ardour/session.h>
#include <ardour/region.h>
#include <ardour/audioplaylist.h>
#include <ardour/audio_track.h>
#include <ardour/audioregion.h>
#include <ardour/diskstream.h>

#include "i18n.h"

using namespace ARDOUR;
using namespace SigC;
using namespace Gtk;

Editor::TimeStretchDialog::TimeStretchDialog (Editor& e)
      : ArdourDialog ("time stretch dialog"),
        editor (e),
        quick_button (_("Quick but Ugly")),
        antialias_button (_("Skip Anti-aliasing")),
        cancel_button (_("Cancel")),
        action_button (_("Stretch/Shrink it"))
{
      set_modal (true);
      set_position (GTK_WIN_POS_MOUSE);
      set_title (_("ardour: timestretch"));
      set_name (N_("TimeStretchDialog"));

      set_hide_on_stop (false);

      add (packer);

      packer.set_spacing (5);
      packer.set_border_width (5);
      packer.pack_start (upper_button_box);
      packer.pack_start (progress_bar);
      packer.pack_start (lower_button_box);
      
      upper_button_box.set_homogeneous (true);
      upper_button_box.set_spacing (5);
      upper_button_box.set_border_width (5);
      upper_button_box.pack_start (quick_button, true, true);
      upper_button_box.pack_start (antialias_button, true, true);

      lower_button_box.set_homogeneous (true);
      lower_button_box.set_spacing (5);
      lower_button_box.set_border_width (5);
      lower_button_box.pack_start (action_button, true, true);
      lower_button_box.pack_start (cancel_button, true, true);

      action_button.set_name (N_("TimeStretchButton"));
      cancel_button.set_name (N_("TimeStretchButton"));
      quick_button.set_name (N_("TimeStretchButton"));
      antialias_button.set_name (N_("TimeStretchButton"));
      progress_bar.set_name (N_("TimeStretchProgress"));

      action_button.clicked.connect (bind (slot (*this, &ArdourDialog::stop), 1));
}

gint
Editor::TimeStretchDialog::update_progress ()
{
      progress_bar.set_percentage (request.progress);
      return request.running;
}

void
Editor::TimeStretchDialog::cancel_timestretch_in_progress ()
{
      status = -2;
      request.running = false;
}

gint
Editor::TimeStretchDialog::delete_timestretch_in_progress (GdkEventAny* ev)
{
      status = -2;
      request.running = false;
      return TRUE;
}

int
Editor::run_timestretch (AudioRegionSelection& regions, float fraction)
{
      pthread_t thread;

      if (current_timestretch == 0) {
            current_timestretch = new TimeStretchDialog (*this);
      }

      current_timestretch->progress_bar.set_percentage (0.0f);
      current_timestretch->first_cancel = current_timestretch->cancel_button.clicked.connect (bind (slot (*current_timestretch, &ArdourDialog::stop), -1));
      current_timestretch->first_delete = current_timestretch->delete_event.connect (slot (*current_timestretch, &ArdourDialog::wm_close_event));

      current_timestretch->run ();

      if (current_timestretch->run_status() != 1) {
            current_timestretch->close ();
            return 1; /* no error, but we did nothing */
      }

      current_timestretch->status = 0;
      current_timestretch->regions = regions;
      current_timestretch->request.fraction = fraction;
      current_timestretch->request.quick_seek = current_timestretch->quick_button.get_active();
      current_timestretch->request.antialias = !current_timestretch->antialias_button.get_active();
      current_timestretch->request.progress = 0.0f;
      current_timestretch->request.running = true;
      
      /* re-connect the cancel button and delete events */
      
      current_timestretch->first_cancel.disconnect();
      current_timestretch->first_delete.disconnect();
      
      current_timestretch->cancel_button.clicked.connect (slot (current_timestretch, &TimeStretchDialog::cancel_timestretch_in_progress));
      current_timestretch->delete_event.connect (slot (current_timestretch, &TimeStretchDialog::delete_timestretch_in_progress));

      if (pthread_create_and_store ("timestretch", &thread, 0, timestretch_thread, current_timestretch)) {
            current_timestretch->close ();
            error << _("timestretch cannot be started - thread creation error") << endmsg;
            return -1;
      }

      pthread_detach (thread);

      SigC::Connection c = Main::timeout.connect (slot (current_timestretch, &TimeStretchDialog::update_progress), 100);

      while (current_timestretch->request.running) {
            gtk_main_iteration ();
      }

      c.disconnect ();

      current_timestretch->close ();
      return current_timestretch->status;
}

void
Editor::do_timestretch (TimeStretchDialog& dialog)
{
      AudioTrack* at;
      Playlist* playlist;
      AudioRegion* new_region;

      for (AudioRegionSelection::iterator i = dialog.regions.begin(); i != dialog.regions.end(); ) {

            AudioRegion& aregion ((*i)->region);
            TimeAxisView* tv = &(*i)->get_time_axis_view();
            AudioTimeAxisView* atv;
            AudioRegionSelection::iterator tmp;
            
            tmp = i;
            ++tmp;

            if ((atv = dynamic_cast<AudioTimeAxisView*> (tv)) == 0) {
                  i = tmp;
                  continue;
            }

            if ((at = dynamic_cast<AudioTrack*> (&atv->route())) == 0) {
                  i = tmp;
                  continue;
            }
      
            if ((playlist = at->disk_stream().playlist()) == 0) {
                  i = tmp;
                  continue;
            }

            dialog.request.region = &aregion;

            if (!dialog.request.running) {
                  /* we were cancelled */
                  dialog.status = 1;
                  return;
            }

            if ((new_region = session->tempoize_region (dialog.request)) == 0) {
                  dialog.status = -1;
                  dialog.request.running = false;
                  return;
            }

            session->add_undo (playlist->get_memento());
            playlist->replace_region (aregion, *new_region, aregion.position());
            session->add_redo_no_execute (playlist->get_memento());

            i = tmp;
      }

      dialog.status = 0;
      dialog.request.running = false;
}

void*
Editor::timestretch_thread (void *arg)
{
      PBD::ThreadCreated (pthread_self(), X_("TimeFX"));

      TimeStretchDialog* tsd = static_cast<TimeStretchDialog*>(arg);

      pthread_setcanceltype (PTHREAD_CANCEL_ASYNCHRONOUS, 0);

      tsd->editor.do_timestretch (*tsd);

      return 0;
}


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