/*

 * GStreamer

 * Copyright (C) 2008 Nokia Corporation <multimedia@maemo.org>

 *

 * 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., 59 Temple Place - Suite 330,

 * Boston, MA 02111-1307, USA.

 */

/**

 * SECTION:camerabingeneral

 * @short_description: helper functions for #GstCameraBin and it's modules

 *

 * Common helper functions for #GstCameraBin, #GstCameraBinImage and

 * #GstCameraBinVideo.

 *

 */

#include "camerabingeneral.h"

#include <glib.h>

GST_DEBUG_CATEGORY (gst_camerabin_debug);

static gboolean

camerabin_general_dbg_have_event (GstPad * pad, GstEvent * event,

    gpointer u_data)

{

  switch (GST_EVENT_TYPE (event)) {

    case GST_EVENT_NEWSEGMENT:

    {

      GstElement *elem = (GstElement *) u_data;

      gchar *elem_name = gst_element_get_name (elem);

      gchar *pad_name = gst_pad_get_name (pad);

      gboolean update;

      gdouble rate;

      GstFormat format;

      gint64 start, stop, pos;

      gst_event_parse_new_segment (event, &update, &rate, &format, &start,

          &stop, &pos);

      GST_DEBUG ("element %s, pad %s, new_seg_start =%" GST_TIME_FORMAT

          ", new_seg_stop =%" GST_TIME_FORMAT

          ", new_seg_pos =%" GST_TIME_FORMAT "\n", elem_name, pad_name,

          GST_TIME_ARGS (start), GST_TIME_ARGS (stop), GST_TIME_ARGS (pos));

      g_free (pad_name);

      g_free (elem_name);

    }

      break;

    default:

      break;

  }

  return TRUE;

}

static gboolean

camerabin_general_dbg_have_buffer (GstPad * pad, GstBuffer * buffer,

    gpointer u_data)

{

  GstElement *elem = (GstElement *) u_data;

  gchar *elem_name = gst_element_get_name (elem);

  gchar *pad_name = gst_pad_get_name (pad);

  GST_DEBUG ("element %s, pad %s, buf_ts =%" GST_TIME_FORMAT "\n", elem_name,

      pad_name, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)));

  g_free (pad_name);

  g_free (elem_name);

  return TRUE;

}

void

camerabin_general_dbg_set_probe (GstElement * elem, gchar * pad_name,

    gboolean buf, gboolean evt)

{

  GstPad *pad = gst_element_get_static_pad (elem, pad_name);

  if (buf)

    gst_pad_add_buffer_probe (pad,

        G_CALLBACK (camerabin_general_dbg_have_buffer), elem);

  if (evt)

    gst_pad_add_event_probe (pad,

        G_CALLBACK (camerabin_general_dbg_have_event), elem);

  gst_object_unref (pad);

}

/**

 * gst_camerabin_add_element:

 * @bin: add an element to this bin

 * @new_elem: new element to be added

 *

 * Adds given element to given @bin. Looks for an unconnected src pad

 * from the @bin and links the element to it.  Raises an error if adding

 * or linking failed.

 *

 * Returns: %TRUE if adding and linking succeeded, %FALSE otherwise.

 */

gboolean

gst_camerabin_add_element (GstBin * bin, GstElement * new_elem)

{

  gboolean ret = FALSE;

  ret = gst_camerabin_try_add_element (bin, new_elem);

  if (!ret) {

    gchar *elem_name = gst_element_get_name (new_elem);

    GST_ELEMENT_ERROR (bin, CORE, NEGOTIATION, (NULL),

        ("linking %s failed", elem_name));

    g_free (elem_name);

  }

  return ret;

}

/**

 * gst_camerabin_try_add_element:

 * @bin: tries adding an element to this bin

 * @new_elem: new element to be added

 *

 * Adds given element to given @bin. Looks for an unconnected src pad

 * from the @bin and links the element to it.

 *

 * Returns: %TRUE if adding and linking succeeded, %FALSE otherwise.

 */

gboolean

gst_camerabin_try_add_element (GstBin * bin, GstElement * new_elem)

{

  GstPad *bin_pad;

  GstElement *bin_elem;

  gboolean ret = TRUE;

  if (!bin || !new_elem) {

    return FALSE;

  }

  /* Get pads for linking */

  GST_DEBUG ("finding unconnected src pad");

  //bin_pad = gst_bin_find_unlinked_pad (bin, GST_PAD_SRC);

  bin_pad = gst_bin_find_unconnected_pad (bin, GST_PAD_SRC);

  GST_DEBUG ("unconnected pad %s:%s", GST_DEBUG_PAD_NAME (bin_pad));

  /* Add to bin */

  gst_bin_add (GST_BIN (bin), new_elem);

  /* Link, if unconnected pad was found, otherwise just add it to bin */

  if (bin_pad) {

    bin_elem = gst_pad_get_parent_element (bin_pad);

    gst_object_unref (bin_pad);

    if (!gst_element_link (bin_elem, new_elem)) {

      gst_bin_remove (bin, new_elem);

      ret = FALSE;

    }

    gst_object_unref (bin_elem);

  }

  return ret;

}

/**

 * gst_camerabin_create_and_add_element:

 * @bin: tries adding an element to this bin

 * @elem_name: name of the element to be created

 *

 * Creates an element according to given name and

 * adds it to given @bin. Looks for an unconnected src pad

 * from the @bin and links the element to it.

 *

 * Returns: pointer to the new element if successful, NULL otherwise.

 */

GstElement *

gst_camerabin_create_and_add_element (GstBin * bin, const gchar * elem_name)

{

  GstElement *new_elem = NULL;

  GST_DEBUG ("adding %s", elem_name);

  new_elem = gst_element_factory_make (elem_name, NULL);

  if (!new_elem) {

    GST_ELEMENT_ERROR (bin, CORE, MISSING_PLUGIN, (NULL),

        ("could not create \"%s\" element.", elem_name));

  } else if (!gst_camerabin_add_element (bin, new_elem)) {

    new_elem = NULL;

  }

  return new_elem;

}

/**

 * gst_camerabin_remove_elements_from_bin:

 * @bin: removes all elements from this bin

 *

 * Removes all elements from this @bin.

 */

void

gst_camerabin_remove_elements_from_bin (GstBin * bin)

{

  GstIterator *iter = NULL;

  gpointer data = NULL;

  GstElement *elem = NULL;

  gboolean done = FALSE;

  iter = gst_bin_iterate_elements (bin);

  while (!done) {

    switch (gst_iterator_next (iter, &data)) {

      case GST_ITERATOR_OK:

        elem = GST_ELEMENT (data);

        gst_bin_remove (bin, elem);

        /* Iterator increased the element refcount, so unref */

        gst_object_unref (elem);

        break;

      case GST_ITERATOR_RESYNC:

        gst_iterator_resync (iter);

        break;

      case GST_ITERATOR_ERROR:

        GST_WARNING_OBJECT (bin, "error in iterating elements");

        done = TRUE;

        break;

      case GST_ITERATOR_DONE:

        done = TRUE;

        break;

    }

  }

  gst_iterator_free (iter);

}

/**

 * gst_camerabin_drop_eos_probe:

 * @pad: pad receiving the event

 * @event: received event

 * @u_data: not used

 *

 * Event probe that drop all eos events.

 *

 * Returns: FALSE to drop the event, TRUE otherwise

 */

gboolean

gst_camerabin_drop_eos_probe (GstPad * pad, GstEvent * event, gpointer u_data)

{

  gboolean ret = TRUE;

  switch (GST_EVENT_TYPE (event)) {

    case GST_EVENT_EOS:

      GST_DEBUG ("dropping eos in %s:%s", GST_DEBUG_PAD_NAME (pad));

      ret = FALSE;

      break;

    default:

      break;

  }

  return ret;

}