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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.

*/

#include <cstdlib>
#include <cmath>

#include <string>

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

#include <gtkmm2ext/window_title.h>

#include "editor.h"
#include "audio_time_axis.h"
#include "audio_region_view.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/audio_diskstream.h>

#include "i18n.h"

using namespace ARDOUR;
using namespace PBD;
using namespace sigc;
using namespace Gtk;
using namespace Gtkmm2ext;

Editor::TimeStretchDialog::TimeStretchDialog (Editor& e)
      : ArdourDialog ("time stretch dialog"),
        editor (e),
        quick_button (_("Quick but Ugly")),
        antialias_button (_("Skip Anti-aliasing"))
{
      set_modal (true);
      set_position (Gtk::WIN_POS_MOUSE);
      set_name (N_("TimeStretchDialog"));

      WindowTitle title(Glib::get_application_name());
      title += _("Timestretch");
      set_title(title.get_string());

      get_vbox()->set_spacing (5);
      get_vbox()->set_border_width (5);
      get_vbox()->pack_start (upper_button_box);
      get_vbox()->pack_start (progress_bar);

      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);

      action_button = add_button (_("Stretch/Shrink it"), Gtk::RESPONSE_ACCEPT);
      cancel_button = add_button (_("Cancel"), Gtk::RESPONSE_CANCEL);

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

      show_all_children ();
}

gint
Editor::TimeStretchDialog::update_progress ()
{
      progress_bar.set_fraction (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 (RegionSelection& regions, float fraction)
{
      pthread_t thread;

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

      current_timestretch->progress_bar.set_fraction (0.0f);

      switch (current_timestretch->run ()) {
      case RESPONSE_ACCEPT:
            break;
      default:
            current_timestretch->hide ();
            return 1;
      }

      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->signal_clicked().connect (mem_fun (current_timestretch, &TimeStretchDialog::cancel_timestretch_in_progress));
      current_timestretch->signal_delete_event().connect (mem_fun (current_timestretch, &TimeStretchDialog::delete_timestretch_in_progress));

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

      pthread_detach (thread);

      sigc::connection c = Glib::signal_timeout().connect (mem_fun (current_timestretch, &TimeStretchDialog::update_progress), 100);

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

      c.disconnect ();
      
      current_timestretch->hide ();
      return current_timestretch->status;
}

void
Editor::do_timestretch (TimeStretchDialog& dialog)
{
      Track*    t;
      boost::shared_ptr<Playlist> playlist;
      boost::shared_ptr<Region>   new_region;

      for (RegionSelection::iterator i = dialog.regions.begin(); i != dialog.regions.end(); ) {
            AudioRegionView* arv = dynamic_cast<AudioRegionView*>(*i);
            if (!arv)
                  continue;

            boost::shared_ptr<AudioRegion> region (arv->audio_region());
            TimeAxisView* tv = &(arv->get_time_axis_view());
            RouteTimeAxisView* rtv;
            RegionSelection::iterator tmp;
            
            tmp = i;
            ++tmp;

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

            if ((t = dynamic_cast<Track*> (rtv->route().get())) == 0) {
                  i = tmp;
                  continue;
            }
      
            if ((playlist = t->diskstream()->playlist()) == 0) {
                  i = tmp;
                  continue;
            }

            dialog.request.region = region;

            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;
            }

            XMLNode &before = playlist->get_state();
            playlist->replace_region (region, new_region, region->position());
            XMLNode &after = playlist->get_state();
            session->add_command (new MementoCommand<Playlist>(*playlist, &before, &after));

            i = tmp;
      }

      dialog.status = 0;
      dialog.request.running = false;
      dialog.request.region.reset ();
}

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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