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Revert the gst_param_spec_is_mutable API for this release so we can discuss it a bit further first.
207 lines
6.4 KiB
C
207 lines
6.4 KiB
C
/* GStreamer - GParamSpecs for some of our types
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* Copyright (C) 2007 Tim-Philipp Müller <tim centricular net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:gstparamspec
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* @short_description: GParamSpec implementations specific
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* to GStreamer
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*
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* GParamSpec implementations specific to GStreamer.
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*
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* Last reviewed on 2008-03-11 (0.10.18)
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gst_private.h"
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#include "glib-compat-private.h"
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#include "gstparamspecs.h"
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/* --- GstParamSpecFraction --- */
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static void
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_gst_param_fraction_init (GParamSpec * pspec)
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{
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GstParamSpecFraction *fspec = GST_PARAM_SPEC_FRACTION (pspec);
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fspec->min_num = 0;
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fspec->min_den = 1;
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fspec->max_num = G_MAXINT;
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fspec->max_den = 1;
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fspec->def_num = 1;
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fspec->def_den = 1;
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}
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static void
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_gst_param_fraction_set_default (GParamSpec * pspec, GValue * value)
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{
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value->data[0].v_int = GST_PARAM_SPEC_FRACTION (pspec)->def_num;
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value->data[1].v_int = GST_PARAM_SPEC_FRACTION (pspec)->def_den;
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}
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static gboolean
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_gst_param_fraction_validate (GParamSpec * pspec, GValue * value)
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{
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GstParamSpecFraction *fspec = GST_PARAM_SPEC_FRACTION (pspec);
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gboolean within_range = FALSE;
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GValue f_this = { 0, };
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GValue f_min = { 0, };
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GValue f_max = { 0, };
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gint res;
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g_value_init (&f_this, GST_TYPE_FRACTION);
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gst_value_set_fraction (&f_this, value->data[0].v_int, value->data[1].v_int);
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g_value_init (&f_min, GST_TYPE_FRACTION);
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gst_value_set_fraction (&f_min, fspec->min_num, fspec->min_den);
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g_value_init (&f_max, GST_TYPE_FRACTION);
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gst_value_set_fraction (&f_max, fspec->max_num, fspec->max_den);
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res = gst_value_compare (&f_min, &f_this);
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#ifndef GST_DISABLE_GST_DEBUG
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GST_LOG ("comparing %d/%d to %d/%d, result = %d", fspec->min_num,
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fspec->min_den, value->data[0].v_int, value->data[1].v_int, res);
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#endif
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if (res != GST_VALUE_LESS_THAN && res != GST_VALUE_EQUAL)
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goto out;
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#ifndef GST_DISABLE_GST_DEBUG
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GST_LOG ("comparing %d/%d to %d/%d, result = %d", value->data[0].v_int,
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value->data[1].v_int, fspec->max_num, fspec->max_den, res);
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#endif
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res = gst_value_compare (&f_this, &f_max);
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if (res != GST_VALUE_LESS_THAN && res != GST_VALUE_EQUAL)
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goto out;
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within_range = TRUE;
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out:
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g_value_unset (&f_min);
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g_value_unset (&f_max);
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g_value_unset (&f_this);
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#ifndef GST_DISABLE_GST_DEBUG
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GST_LOG ("%swithin range", (within_range) ? "" : "not ");
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#endif
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/* return FALSE if everything ok, otherwise TRUE */
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return !within_range;
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}
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static gint
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_gst_param_fraction_values_cmp (GParamSpec * pspec, const GValue * value1,
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const GValue * value2)
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{
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gint res;
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res = gst_value_compare (value1, value2);
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g_assert (res != GST_VALUE_UNORDERED);
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/* GST_VALUE_LESS_THAN is -1, EQUAL is 0, and GREATER_THAN is 1 */
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return res;
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}
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GType
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gst_param_spec_fraction_get_type (void)
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{
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static GType type; /* 0 */
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/* register GST_TYPE_PARAM_FRACTION */
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if (type == 0) {
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static GParamSpecTypeInfo pspec_info = {
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sizeof (GstParamSpecFraction), /* instance_size */
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0, /* n_preallocs */
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_gst_param_fraction_init, /* instance_init */
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G_TYPE_INVALID, /* value_type */
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NULL, /* finalize */
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_gst_param_fraction_set_default, /* value_set_default */
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_gst_param_fraction_validate, /* value_validate */
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_gst_param_fraction_values_cmp, /* values_cmp */
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};
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pspec_info.value_type = GST_TYPE_FRACTION;
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type = g_param_type_register_static ("GstParamFraction", &pspec_info);
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}
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return type;
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}
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/**
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* gst_param_spec_fraction:
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* @name: canonical name of the property specified
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* @nick: nick name for the property specified
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* @blurb: description of the property specified
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* @min_num: minimum value (fraction numerator)
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* @min_denom: minimum value (fraction denominator)
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* @max_num: maximum value (fraction numerator)
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* @max_denom: maximum value (fraction denominator)
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* @default_num: default value (fraction numerator)
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* @default_denom: default value (fraction denominator)
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* @flags: flags for the property specified
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*
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* This function creates a fraction GParamSpec for use by objects/elements
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* that want to expose properties of fraction type. This function is typically
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* used in connection with g_object_class_install_property() in a GObjects's
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* instance_init function.
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*
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* Returns: a newly created parameter specification
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*
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* Since: 0.10.14
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*/
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GParamSpec *
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gst_param_spec_fraction (const gchar * name, const gchar * nick,
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const gchar * blurb, gint min_num, gint min_denom, gint max_num,
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gint max_denom, gint default_num, gint default_denom, GParamFlags flags)
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{
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GstParamSpecFraction *fspec;
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GParamSpec *pspec;
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GValue default_val = { 0, };
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fspec =
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g_param_spec_internal (GST_TYPE_PARAM_FRACTION, name, nick, blurb, flags);
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fspec->min_num = min_num;
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fspec->min_den = min_denom;
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fspec->max_num = max_num;
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fspec->max_den = max_denom;
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fspec->def_num = default_num;
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fspec->def_den = default_denom;
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pspec = G_PARAM_SPEC (fspec);
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/* check that min <= default <= max */
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g_value_init (&default_val, GST_TYPE_FRACTION);
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gst_value_set_fraction (&default_val, default_num, default_denom);
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/* validate returns TRUE if the validation fails */
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if (_gst_param_fraction_validate (pspec, &default_val)) {
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g_critical ("GstParamSpec of type 'fraction' for property '%s' has a "
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"default value of %d/%d, which is not within the allowed range of "
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"%d/%d to %d/%d", name, default_num, default_denom, min_num,
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min_denom, max_num, max_denom);
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g_param_spec_ref (pspec);
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g_param_spec_sink (pspec);
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g_param_spec_unref (pspec);
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pspec = NULL;
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}
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g_value_unset (&default_val);
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return pspec;
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}
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