text: /* GStreamer
   * Copyright (C) 2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Library General Public
   * License as published by the Free Software Foundation; either
   * version 2 of the License, or (at your option) any later version.
   *
   * This library 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
   * Library General Public License for more details.
   *
   * You should have received a copy of the GNU Library General Public
   * License along with this library; if not, write to the
   * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
   * Boston, MA 02110-1301, USA.
   */
  
  #ifdef HAVE_CONFIG_H
  #include "config.h"
  #endif
  
  #include <gst/gst.h>
  #include <string.h>
  
  #include "mxfessence.h"
  
  GST_DEBUG_CATEGORY_EXTERN (mxf_debug);
  #define GST_CAT_DEFAULT mxf_debug
  
  static GSList *_mxf_essence_element_handler_registry = NULL;
  
  void
  mxf_essence_element_handler_register (const MXFEssenceElementHandler * handler)
  {
    _mxf_essence_element_handler_registry =
        g_slist_prepend (_mxf_essence_element_handler_registry,
        (gpointer) handler);
  }
  
  const MXFEssenceElementHandler *
  mxf_essence_element_handler_find (const MXFMetadataTimelineTrack * track)
  {
    GSList *l;
    const MXFEssenceElementHandler *ret = NULL;
  
    for (l = _mxf_essence_element_handler_registry; l; l = l->next) {
      MXFEssenceElementHandler *current = l->data;
  
      if (current->handles_track (track)) {
        ret = current;
      }
    }
  
    return ret;
  }
  
  static GList *_essence_element_writer_registry = NULL;
  static GPtrArray *_essence_element_writer_pad_templates = NULL;
  
  void
  mxf_essence_element_writer_register (const MXFEssenceElementWriter * writer)
  {
    _essence_element_writer_registry =
        g_list_prepend (_essence_element_writer_registry, (gpointer) writer);
  
    if (!_essence_element_writer_pad_templates)
      _essence_element_writer_pad_templates = g_ptr_array_new ();
  
    if (_essence_element_writer_pad_templates->len > 0 &&
        g_ptr_array_index (_essence_element_writer_pad_templates,
            _essence_element_writer_pad_templates->len - 1) == NULL)
      g_ptr_array_remove_index (_essence_element_writer_pad_templates,
          _essence_element_writer_pad_templates->len - 1);
  
    g_ptr_array_add (_essence_element_writer_pad_templates,
        (gpointer) writer->pad_template);
  }
  
  const GstPadTemplate **
  mxf_essence_element_writer_get_pad_templates (void)
  {
    if (!_essence_element_writer_pad_templates
        || _essence_element_writer_pad_templates->len == 0)
      return NULL;
  
    if (g_ptr_array_index (_essence_element_writer_pad_templates,
            _essence_element_writer_pad_templates->len - 1))
      g_ptr_array_add (_essence_element_writer_pad_templates, NULL);
  
    return (const GstPadTemplate **) _essence_element_writer_pad_templates->pdata;
  }
  
  const MXFEssenceElementWriter *
  mxf_essence_element_writer_find (const GstPadTemplate * templ)
  {
    GList *l = _essence_element_writer_registry;
  
    for (; l; l = l->next) {
      MXFEssenceElementWriter *writer = l->data;
  
      if (writer->pad_template == templ)
        return writer;
    }
  
    return NULL;
  }
  