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vise_core.h

// Copyright 2004 David Hilvert <dhilvert@auricle.dyndns.org>,
//                              <dhilvert@ugcs.caltech.edu>

/*  This file is part of the Anti-Lamenessing Engine.

    The Anti-Lamenessing Engine 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.

    The Anti-Lamenessing Engine 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 the Anti-Lamenessing Engine; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

/*
 * vise_core.h: Manages instances of vise. 
 */

#ifndef __vise_core_h__
#define __vise_core_h__

#include "vise.h"
#include "image.h"
#include "vise/ma.h"
#include "vise/sf.h"

/*
 * Vise_core initializes, and maintains shared variables for, all instances of
 * vise.
 */

class vise_core {
      static vise **active;
      static unsigned int active_size;
      static ale_real scale_factor;

public:

      /*
       * Set the VISE scale factor.
       */
      static void set_scale(ale_real factor) {
            scale_factor = factor;
      }

      /*
       * Add a new video stabilization engine.
       */
      static void add(render *chain, const char *type, const char *prefix, const char *suffix) {

            /*
             * Instantiate an engine of the appropriate type.
             */
            if (!strcmp(type, "identity")) {

                  /*
                   * Identity is a moving average 0 frames to either side.
                   */
                  active = (vise **) realloc(active, ++active_size * sizeof(vise *));
                  assert(active);
                  if (active == NULL) {
                        fprintf(stderr, "\n\n*** VISE: Unable to allocate memory ***\n\n\n");
                        exit(1);
                  }
                  active[active_size - 1] = new ma(chain, 0, prefix, suffix, scale_factor);

            } else if (!strncmp(type, "ma:", 3)) {

                  /*
                   * Moving average with an unsigned range parameter.
                   */

                  unsigned int range;

                  if(sscanf(type + 3, "%u", &range) != 1) {
                        fprintf(stderr, "\n\n*** VISE: 'ma:' type requires an unsigned argument. ***\n\n\n");
                        exit(1);
                  }

                  active = (vise **) realloc(active, ++active_size * sizeof(vise *));
                  assert(active);
                  if (active == NULL) {
                        fprintf(stderr, "\n\n*** VISE: Unable to allocate memory ***\n\n\n");
                        exit(1);
                  }
                  active[active_size - 1] = new ma(chain, range, prefix, suffix, scale_factor);
            } else if (!strncmp(type, "sf:", 3)) {

                  /*
                   * Single frame with an unsigned frame parameter.
                   */

                  unsigned int frame;

                  if(sscanf(type + 3, "%u", &frame) != 1) {
                        fprintf(stderr, "\n\n*** VISE: 'sf:' type requires an unsigned argument. ***\n\n\n");
                        exit(1);
                  }

                  active = (vise **) realloc(active, ++active_size * sizeof(vise *));
                  assert(active);
                  if (active == NULL) {
                        fprintf(stderr, "\n\n*** VISE: Unable to allocate memory ***\n\n\n");
                        exit(1);
                  }
                  active[active_size - 1] = new sf(chain, frame, prefix, suffix, scale_factor);

            } else {
                  fprintf(stderr, "\n\n*** VISE: Unknown type '%s' ***\n\n\n", type);
                  exit(1);
            }

      }

      /*
       * Add a new image to the rendering queue.
       */
      static void frame_queue_add(unsigned int frame_number) {

            /*
             * Process the current queue.
             */
            for (unsigned int i = 0; i < active_size; i++) {
                  int lag = active[i]->lag();

                  if ((int) frame_number - lag >= 0)
                        active[i]->render_frame(frame_number - lag);
            }

            /*
             * If this is the last frame, then complete all rendering.
             */
            if (frame_number == image_rw::count() - 1) 
            for (unsigned int i = 0; i < active_size; i++)
            for (int j = active[i]->lag() - 1; j >= 0; j--)
                  active[i]->render_frame(frame_number - j);
      }
};

#endif

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