/* GStreamer - GParamSpecs for some of our types

 * Copyright (C) 2007 Tim-Philipp Müller  <tim centricular net>

 *

 * 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.

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include "gst_private.h"

#include "glib-compat-private.h"

#include "gstparamspecs.h"

/* --- GstParamSpecFraction --- */

static void

_gst_param_fraction_init (GParamSpec * pspec)

{

  GstParamSpecFraction *fspec = GST_PARAM_SPEC_FRACTION (pspec);

  fspec->min_num = 0;

  fspec->min_den = 1;

  fspec->max_num = G_MAXINT;

  fspec->max_den = 1;

  fspec->def_num = 1;

  fspec->def_den = 1;

}

static void

_gst_param_fraction_set_default (GParamSpec * pspec, GValue * value)

{

  value->data[0].v_int = GST_PARAM_SPEC_FRACTION (pspec)->def_num;

  value->data[1].v_int = GST_PARAM_SPEC_FRACTION (pspec)->def_den;

}

static gboolean

_gst_param_fraction_validate (GParamSpec * pspec, GValue * value)

{

  GstParamSpecFraction *fspec = GST_PARAM_SPEC_FRACTION (pspec);

  gboolean within_range = FALSE;

  GValue f_this = { 0, };

  GValue f_min = { 0, };

  GValue f_max = { 0, };

  gint res;

  g_value_init (&f_this, GST_TYPE_FRACTION);

  gst_value_set_fraction (&f_this, value->data[0].v_int, value->data[1].v_int);

  g_value_init (&f_min, GST_TYPE_FRACTION);

  gst_value_set_fraction (&f_min, fspec->min_num, fspec->min_den);

  g_value_init (&f_max, GST_TYPE_FRACTION);

  gst_value_set_fraction (&f_max, fspec->max_num, fspec->max_den);

  res = gst_value_compare (&f_min, &f_this);

#ifndef GST_DISABLE_GST_DEBUG

  GST_LOG ("comparing %d/%d to %d/%d, result = %d", fspec->min_num,

      fspec->min_den, value->data[0].v_int, value->data[1].v_int, res);

#endif

  if (res != GST_VALUE_LESS_THAN && res != GST_VALUE_EQUAL)

    goto out;

#ifndef GST_DISABLE_GST_DEBUG

  GST_LOG ("comparing %d/%d to %d/%d, result = %d", value->data[0].v_int,

      value->data[1].v_int, fspec->max_num, fspec->max_den, res);

#endif

  res = gst_value_compare (&f_this, &f_max);

  if (res != GST_VALUE_LESS_THAN && res != GST_VALUE_EQUAL)

    goto out;

  within_range = TRUE;

out:

  g_value_unset (&f_min);

  g_value_unset (&f_max);

  g_value_unset (&f_this);

#ifndef GST_DISABLE_GST_DEBUG

  GST_LOG ("%swithin range", (within_range) ? "" : "not ");

#endif

  /* return FALSE if everything ok, otherwise TRUE */

  return !within_range;

}

static gint

_gst_param_fraction_values_cmp (GParamSpec * pspec, const GValue * value1,

    const GValue * value2)

{

  gint res;

  res = gst_value_compare (value1, value2);

  g_assert (res != GST_VALUE_UNORDERED);

  /* GST_VALUE_LESS_THAN is -1, EQUAL is 0, and GREATER_THAN is 1 */

  return res;

}

#ifdef __SYMBIAN32__

EXPORT_C

#endif

GType

gst_param_spec_fraction_get_type (void)

{

  static GType type;            /* 0 */

  /* register GST_TYPE_PARAM_FRACTION */

  if (type == 0) {

    static GParamSpecTypeInfo pspec_info = {

      sizeof (GstParamSpecFraction),    /* instance_size     */

      0,                        /* n_preallocs       */

      _gst_param_fraction_init, /* instance_init     */

      G_TYPE_INVALID,           /* value_type        */

      NULL,                     /* finalize          */

      _gst_param_fraction_set_default,  /* value_set_default */

      _gst_param_fraction_validate,     /* value_validate    */

      _gst_param_fraction_values_cmp,   /* values_cmp        */

    };

    pspec_info.value_type = GST_TYPE_FRACTION;

    type = g_param_type_register_static ("GstParamFraction", &pspec_info);

  }

  return type;

}

/**

 * gst_param_spec_fraction:

 * @name: canonical name of the property specified

 * @nick: nick name for the property specified

 * @blurb: description of the property specified

 * @min_num: minimum value (fraction numerator)

 * @min_denom: minimum value (fraction denominator)

 * @max_num: maximum value (fraction numerator)

 * @max_denom: maximum value (fraction denominator)

 * @default_num: default value (fraction numerator)

 * @default_denom: default value (fraction denominator)

 * @flags: flags for the property specified

 *

 * This function creates a fraction GParamSpec for use by objects/elements

 * that want to expose properties of fraction type. This function is typically

 * used in connection with g_object_class_install_property() in a GObjects's

 * instance_init function.

 *

 * Returns: a newly created parameter specification

 *

 * Since: 0.10.14

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

GParamSpec *

gst_param_spec_fraction (const gchar * name, const gchar * nick,

    const gchar * blurb, gint min_num, gint min_denom, gint max_num,

    gint max_denom, gint default_num, gint default_denom, GParamFlags flags)

{

  GstParamSpecFraction *fspec;

  GParamSpec *pspec;

  GValue default_val = { 0, };

  fspec =

      g_param_spec_internal (GST_TYPE_PARAM_FRACTION, name, nick, blurb, flags);

  fspec->min_num = min_num;

  fspec->min_den = min_denom;

  fspec->max_num = max_num;

  fspec->max_den = max_denom;

  fspec->def_num = default_num;

  fspec->def_den = default_denom;

  pspec = G_PARAM_SPEC (fspec);

  /* check that min <= default <= max */

  g_value_init (&default_val, GST_TYPE_FRACTION);

  gst_value_set_fraction (&default_val, default_num, default_denom);

  /* validate returns TRUE if the validation fails */

  if (_gst_param_fraction_validate (pspec, &default_val)) {

    g_critical ("GstParamSpec of type 'fraction' for property '%s' has a "

        "default value of %d/%d, which is not within the allowed range of "

        "%d/%d to %d/%d", name, default_num, default_denom, min_num,

        min_denom, max_num, max_denom);

    g_param_spec_ref (pspec);

    g_param_spec_sink (pspec);

    g_param_spec_unref (pspec);

    pspec = NULL;

  }

  g_value_unset (&default_val);

  return pspec;

}