author | hgs |
Wed, 24 Mar 2010 18:11:27 -0500 | |
changeset 17 | 512aaca1665c |
parent 16 | 8e837d1bf446 |
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permissions | -rw-r--r-- |
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/* GStreamer |
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu> |
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* 2000 Wim Taymans <wtay@chello.be> |
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* |
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* gstpadtemplate.c: Templates for pad creation |
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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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/** |
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* SECTION:gstpadtemplate |
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* @short_description: Describe the media type of a pad. |
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* @see_also: #GstPad, #GstElementFactory |
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* |
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* Padtemplates describe the possible media types a pad or an elementfactory can |
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* handle. This allows for both inspection of handled types before loading the |
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* element plugin as well as identifying pads on elements that are not yet |
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* created (request or sometimes pads). |
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* |
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* Pad and PadTemplates have #GstCaps attached to it to describe the media type |
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* they are capable of dealing with. gst_pad_template_get_caps() or |
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* GST_PAD_TEMPLATE_CAPS() are used to get the caps of a padtemplate. It's not |
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* possible to modify the caps of a padtemplate after creation. |
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* |
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* PadTemplates have a #GstPadPresence property which identifies the lifetime |
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* of the pad and that can be retrieved with GST_PAD_TEMPLATE_PRESENCE(). Also |
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* the direction of the pad can be retrieved from the #GstPadTemplate with |
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* GST_PAD_TEMPLATE_DIRECTION(). |
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* |
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* The GST_PAD_TEMPLATE_NAME_TEMPLATE () is important for GST_PAD_REQUEST pads |
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* because it has to be used as the name in the gst_element_request_pad_by_name() |
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* call to instantiate a pad from this template. |
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* |
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* Padtemplates can be created with gst_pad_template_new() or with |
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* gst_static_pad_template_get (), which creates a #GstPadTemplate from a |
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* #GstStaticPadTemplate that can be filled with the |
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* convenient GST_STATIC_PAD_TEMPLATE() macro. |
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* |
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* A padtemplate can be used to create a pad (see gst_pad_new_from_template() |
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* or gst_pad_new_from_static_template ()) or to add to an element class |
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* (see gst_element_class_add_pad_template ()). |
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* |
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* The following code example shows the code to create a pad from a padtemplate. |
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* <example> |
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* <title>Create a pad from a padtemplate</title> |
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* <programlisting> |
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* GstStaticPadTemplate my_template = |
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* GST_STATIC_PAD_TEMPLATE ( |
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* "sink", // the name of the pad |
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* GST_PAD_SINK, // the direction of the pad |
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* GST_PAD_ALWAYS, // when this pad will be present |
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* GST_STATIC_CAPS ( // the capabilities of the padtemplate |
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* "audio/x-raw-int, " |
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* "channels = (int) [ 1, 6 ]" |
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* ) |
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* ) |
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* void |
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* my_method (void) |
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* { |
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* GstPad *pad; |
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* pad = gst_pad_new_from_static_template (&my_template, "sink"); |
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* ... |
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* } |
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* </programlisting> |
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* </example> |
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* |
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* The following example shows you how to add the padtemplate to an |
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* element class, this is usually done in the base_init of the class: |
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* <informalexample> |
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* <programlisting> |
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* static void |
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* my_element_base_init (gpointer g_class) |
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* { |
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* GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class); |
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* |
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* gst_element_class_add_pad_template (gstelement_class, |
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* gst_static_pad_template_get (&my_template)); |
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* } |
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* </programlisting> |
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* </informalexample> |
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* |
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* Last reviewed on 2006-02-14 (0.10.3) |
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*/ |
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|
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#include "gst_private.h" |
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|
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#include "gstpad.h" |
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#include "gstpadtemplate.h" |
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#include "gstenumtypes.h" |
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#include "gstmarshal.h" |
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#include "gstutils.h" |
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#include "gstinfo.h" |
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#include "gsterror.h" |
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#include "gstvalue.h" |
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108 |
|
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#define GST_CAT_DEFAULT GST_CAT_PADS |
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110 |
|
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enum |
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{ |
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PROP_NAME_TEMPLATE = 1, |
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PROP_DIRECTION, |
|
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PROP_PRESENCE, |
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PROP_CAPS |
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}; |
|
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||
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enum |
|
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{ |
|
0
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TEMPL_PAD_CREATED, |
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/* FILL ME */ |
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LAST_SIGNAL |
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}; |
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125 |
|
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static GstObject *parent_class = NULL; |
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static guint gst_pad_template_signals[LAST_SIGNAL] = { 0 }; |
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128 |
|
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static void gst_pad_template_dispose (GObject * object); |
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static void gst_pad_template_set_property (GObject * object, guint prop_id, |
131 |
const GValue * value, GParamSpec * pspec); |
|
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static void gst_pad_template_get_property (GObject * object, guint prop_id, |
|
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GValue * value, GParamSpec * pspec); |
|
0
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|
16 | 135 |
G_DEFINE_TYPE (GstPadTemplate, gst_pad_template, GST_TYPE_OBJECT); |
0
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136 |
|
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static void |
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gst_pad_template_class_init (GstPadTemplateClass * klass) |
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{ |
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GObjectClass *gobject_class; |
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GstObjectClass *gstobject_class; |
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142 |
|
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gobject_class = (GObjectClass *) klass; |
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gstobject_class = (GstObjectClass *) klass; |
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145 |
|
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parent_class = g_type_class_peek_parent (klass); |
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147 |
|
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/** |
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* GstPadTemplate::pad-created: |
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* @pad_template: the object which received the signal. |
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* @pad: the pad that was created. |
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* |
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* This signal is fired when an element creates a pad from this template. |
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*/ |
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gst_pad_template_signals[TEMPL_PAD_CREATED] = |
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g_signal_new ("pad-created", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, |
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G_STRUCT_OFFSET (GstPadTemplateClass, pad_created), |
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NULL, NULL, gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD); |
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159 |
|
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gobject_class->dispose = gst_pad_template_dispose; |
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|
16 | 162 |
gobject_class->get_property = gst_pad_template_get_property; |
163 |
gobject_class->set_property = gst_pad_template_set_property; |
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164 |
||
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/** |
|
166 |
* GstPadTemplate:name-template |
|
167 |
* |
|
168 |
* The name template of the pad template. |
|
169 |
* |
|
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* Since: 0.10.21 |
|
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*/ |
|
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g_object_class_install_property (gobject_class, PROP_NAME_TEMPLATE, |
|
173 |
g_param_spec_string ("name-template", "Name template", |
|
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"The name template of the pad template", NULL, |
|
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS)); |
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176 |
||
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/** |
|
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* GstPadTemplate:direction |
|
179 |
* |
|
180 |
* The direction of the pad described by the pad template. |
|
181 |
* |
|
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* Since: 0.10.21 |
|
183 |
*/ |
|
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g_object_class_install_property (gobject_class, PROP_DIRECTION, |
|
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g_param_spec_enum ("direction", "Direction", |
|
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"The direction of the pad described by the pad template", |
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GST_TYPE_PAD_DIRECTION, GST_PAD_UNKNOWN, |
|
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS)); |
|
189 |
||
190 |
/** |
|
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* GstPadTemplate:presence |
|
192 |
* |
|
193 |
* When the pad described by the pad template will become available. |
|
194 |
* |
|
195 |
* Since: 0.10.21 |
|
196 |
*/ |
|
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g_object_class_install_property (gobject_class, PROP_PRESENCE, |
|
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g_param_spec_enum ("presence", "Presence", |
|
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"When the pad described by the pad template will become available", |
|
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GST_TYPE_PAD_PRESENCE, GST_PAD_ALWAYS, |
|
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS)); |
|
202 |
||
203 |
/** |
|
204 |
* GstPadTemplate:caps |
|
205 |
* |
|
206 |
* The capabilities of the pad described by the pad template. |
|
207 |
* |
|
208 |
* Since: 0.10.21 |
|
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*/ |
|
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g_object_class_install_property (gobject_class, PROP_CAPS, |
|
211 |
g_param_spec_boxed ("caps", "Caps", |
|
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"The capabilities of the pad described by the pad template", |
|
213 |
GST_TYPE_CAPS, |
|
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS)); |
|
215 |
||
0
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gstobject_class->path_string_separator = "*"; |
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} |
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218 |
|
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static void |
16 | 220 |
gst_pad_template_init (GstPadTemplate * templ) |
0
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{ |
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/* FIXME 0.11: Does anybody remember why this is here? If not, let's |
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* change it for 0.11 and let gst_element_class_add_pad_template() for |
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* example ref/sink the pad templates. |
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*/ |
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/* We ensure that the pad template we're creating has a sunken reference. |
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* Inconsistencies in pad templates being floating or sunken has caused |
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* problems in the past with leaks, etc. |
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* |
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* For consistency, then, we only produce them with sunken references |
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* owned by the creator of the object |
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*/ |
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if (GST_OBJECT_IS_FLOATING (templ)) { |
16 | 234 |
gst_object_ref_sink (templ); |
0
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} |
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} |
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237 |
|
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static void |
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gst_pad_template_dispose (GObject * object) |
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{ |
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GstPadTemplate *templ = GST_PAD_TEMPLATE (object); |
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242 |
|
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g_free (GST_PAD_TEMPLATE_NAME_TEMPLATE (templ)); |
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if (GST_PAD_TEMPLATE_CAPS (templ)) { |
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gst_caps_unref (GST_PAD_TEMPLATE_CAPS (templ)); |
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} |
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247 |
|
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G_OBJECT_CLASS (parent_class)->dispose (object); |
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} |
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250 |
|
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/* ALWAYS padtemplates cannot have conversion specifications (like src_%d), |
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* since it doesn't make sense. |
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* SOMETIMES padtemplates can do whatever they want, they are provided by the |
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* element. |
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* REQUEST padtemplates can be reverse-parsed (the user asks for 'sink1', the |
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256 |
* 'sink%d' template is automatically selected), so we need to restrict their |
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* naming. |
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*/ |
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259 |
static gboolean |
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name_is_valid (const gchar * name, GstPadPresence presence) |
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261 |
{ |
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const gchar *str; |
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263 |
|
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if (presence == GST_PAD_ALWAYS) { |
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if (strchr (name, '%')) { |
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g_warning ("invalid name template %s: conversion specifications are not" |
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" allowed for GST_PAD_ALWAYS padtemplates", name); |
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return FALSE; |
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269 |
} |
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} else if (presence == GST_PAD_REQUEST) { |
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if ((str = strchr (name, '%')) && strchr (str + 1, '%')) { |
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g_warning ("invalid name template %s: only one conversion specification" |
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" allowed in GST_PAD_REQUEST padtemplate", name); |
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return FALSE; |
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} |
16 | 276 |
if (str && (*(str + 1) != 's' && *(str + 1) != 'd' && *(str + 1) != 'u')) { |
0
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g_warning ("invalid name template %s: conversion specification must be of" |
16 | 278 |
" type '%%d', '%%u' or '%%s' for GST_PAD_REQUEST padtemplate", name); |
0
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return FALSE; |
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280 |
} |
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if (str && (*(str + 2) != '\0')) { |
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g_warning ("invalid name template %s: conversion specification must" |
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" appear at the end of the GST_PAD_REQUEST padtemplate name", name); |
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284 |
return FALSE; |
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285 |
} |
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286 |
} |
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287 |
|
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288 |
return TRUE; |
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289 |
} |
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290 |
#ifdef __SYMBIAN32__ |
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291 |
EXPORT_C |
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#endif |
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293 |
|
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294 |
|
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295 |
GType |
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gst_static_pad_template_get_type (void) |
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297 |
{ |
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static GType staticpadtemplate_type = 0; |
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299 |
|
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if (G_UNLIKELY (staticpadtemplate_type == 0)) { |
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staticpadtemplate_type = |
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g_pointer_type_register_static ("GstStaticPadTemplate"); |
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303 |
} |
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return staticpadtemplate_type; |
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} |
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306 |
|
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307 |
/** |
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308 |
* gst_static_pad_template_get: |
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* @pad_template: the static pad template |
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* |
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* Converts a #GstStaticPadTemplate into a #GstPadTemplate. |
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312 |
* |
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* Returns: a new #GstPadTemplate. |
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314 |
*/ |
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315 |
#ifdef __SYMBIAN32__ |
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316 |
EXPORT_C |
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#endif |
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318 |
|
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GstPadTemplate * |
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gst_static_pad_template_get (GstStaticPadTemplate * pad_template) |
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321 |
{ |
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GstPadTemplate *new; |
16 | 323 |
GstCaps *caps; |
0
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324 |
|
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if (!name_is_valid (pad_template->name_template, pad_template->presence)) |
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326 |
return NULL; |
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327 |
|
16 | 328 |
caps = gst_static_caps_get (&pad_template->static_caps); |
0
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329 |
|
16 | 330 |
new = g_object_new (gst_pad_template_get_type (), |
331 |
"name", pad_template->name_template, |
|
332 |
"name-template", pad_template->name_template, |
|
333 |
"direction", pad_template->direction, |
|
334 |
"presence", pad_template->presence, "caps", caps, NULL); |
|
0
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335 |
|
16 | 336 |
gst_caps_unref (caps); |
0
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337 |
|
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338 |
return new; |
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339 |
} |
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340 |
|
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341 |
/** |
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342 |
* gst_pad_template_new: |
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* @name_template: the name template. |
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* @direction: the #GstPadDirection of the template. |
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* @presence: the #GstPadPresence of the pad. |
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* @caps: a #GstCaps set for the template. The caps are taken ownership of. |
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347 |
* |
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348 |
* Creates a new pad template with a name according to the given template |
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349 |
* and with the given arguments. This functions takes ownership of the provided |
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* caps, so be sure to not use them afterwards. |
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351 |
* |
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352 |
* Returns: a new #GstPadTemplate. |
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353 |
*/ |
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|
354 |
#ifdef __SYMBIAN32__ |
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355 |
EXPORT_C |
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356 |
#endif |
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357 |
GstPadTemplate * |
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358 |
gst_pad_template_new (const gchar * name_template, |
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359 |
GstPadDirection direction, GstPadPresence presence, GstCaps * caps) |
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360 |
{ |
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361 |
GstPadTemplate *new; |
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362 |
|
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363 |
g_return_val_if_fail (name_template != NULL, NULL); |
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|
364 |
g_return_val_if_fail (caps != NULL, NULL); |
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|
365 |
g_return_val_if_fail (direction == GST_PAD_SRC |
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366 |
|| direction == GST_PAD_SINK, NULL); |
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|
367 |
g_return_val_if_fail (presence == GST_PAD_ALWAYS |
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368 |
|| presence == GST_PAD_SOMETIMES || presence == GST_PAD_REQUEST, NULL); |
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|
369 |
|
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|
370 |
if (!name_is_valid (name_template, presence)) { |
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371 |
gst_caps_unref (caps); |
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|
372 |
return NULL; |
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373 |
} |
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|
374 |
|
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|
375 |
new = g_object_new (gst_pad_template_get_type (), |
16 | 376 |
"name", name_template, "name-template", name_template, |
377 |
"direction", direction, "presence", presence, "caps", caps, NULL); |
|
0
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378 |
|
16 | 379 |
if (caps) |
380 |
gst_caps_unref (caps); |
|
0
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|
381 |
|
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|
382 |
return new; |
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383 |
} |
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|
384 |
|
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|
385 |
/** |
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|
386 |
* gst_static_pad_template_get_caps: |
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|
387 |
* @templ: a #GstStaticPadTemplate to get capabilities of. |
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|
388 |
* |
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|
389 |
* Gets the capabilities of the static pad template. |
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|
390 |
* |
16 | 391 |
* Returns: the #GstCaps of the static pad template. |
392 |
* Unref after usage. Since the core holds an additional |
|
393 |
* ref to the returned caps, use gst_caps_make_writable() |
|
394 |
* on the returned caps to modify it. |
|
0
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395 |
*/ |
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|
396 |
#ifdef __SYMBIAN32__ |
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397 |
EXPORT_C |
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|
398 |
#endif |
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|
399 |
|
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400 |
GstCaps * |
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gst_static_pad_template_get_caps (GstStaticPadTemplate * templ) |
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|
402 |
{ |
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403 |
g_return_val_if_fail (templ, NULL); |
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|
404 |
|
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|
405 |
return (GstCaps *) gst_static_caps_get (&templ->static_caps); |
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|
406 |
} |
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|
407 |
|
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408 |
/** |
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409 |
* gst_pad_template_get_caps: |
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* @templ: a #GstPadTemplate to get capabilities of. |
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411 |
* |
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|
412 |
* Gets the capabilities of the pad template. |
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413 |
* |
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414 |
* Returns: the #GstCaps of the pad template. If you need to keep a reference to |
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* the caps, take a ref (see gst_caps_ref ()). |
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416 |
*/ |
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417 |
#ifdef __SYMBIAN32__ |
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418 |
EXPORT_C |
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419 |
#endif |
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|
420 |
|
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|
421 |
GstCaps * |
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gst_pad_template_get_caps (GstPadTemplate * templ) |
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423 |
{ |
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g_return_val_if_fail (GST_IS_PAD_TEMPLATE (templ), NULL); |
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|
425 |
|
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return GST_PAD_TEMPLATE_CAPS (templ); |
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427 |
} |
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|
428 |
|
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|
429 |
/** |
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|
430 |
* gst_pad_template_pad_created: |
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|
431 |
* @templ: a #GstPadTemplate that has been created |
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* @pad: the #GstPad that created it |
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433 |
* |
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|
434 |
* Emit the pad-created signal for this template when created by this pad. |
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435 |
*/ |
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|
436 |
#ifdef __SYMBIAN32__ |
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|
437 |
EXPORT_C |
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|
438 |
#endif |
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|
439 |
|
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|
440 |
void |
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|
441 |
gst_pad_template_pad_created (GstPadTemplate * templ, GstPad * pad) |
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|
442 |
{ |
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|
443 |
g_signal_emit (G_OBJECT (templ), |
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|
444 |
gst_pad_template_signals[TEMPL_PAD_CREATED], 0, pad); |
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|
445 |
} |
16 | 446 |
|
447 |
static void |
|
448 |
gst_pad_template_set_property (GObject * object, guint prop_id, |
|
449 |
const GValue * value, GParamSpec * pspec) |
|
450 |
{ |
|
451 |
/* these properties are all construct-only */ |
|
452 |
switch (prop_id) { |
|
453 |
case PROP_NAME_TEMPLATE: |
|
454 |
GST_PAD_TEMPLATE_NAME_TEMPLATE (object) = g_value_dup_string (value); |
|
455 |
break; |
|
456 |
case PROP_DIRECTION: |
|
457 |
GST_PAD_TEMPLATE_DIRECTION (object) = g_value_get_enum (value); |
|
458 |
break; |
|
459 |
case PROP_PRESENCE: |
|
460 |
GST_PAD_TEMPLATE_PRESENCE (object) = g_value_get_enum (value); |
|
461 |
break; |
|
462 |
case PROP_CAPS: |
|
463 |
/* allow caps == NULL for backwards compatibility (ie. g_object_new() |
|
464 |
* called without any of the new properties) (FIXME 0.11) */ |
|
465 |
if (g_value_get_boxed (value) != NULL) { |
|
466 |
GST_PAD_TEMPLATE_CAPS (object) = |
|
467 |
gst_caps_copy (g_value_get_boxed (value)); |
|
468 |
} |
|
469 |
break; |
|
470 |
default: |
|
471 |
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); |
|
472 |
break; |
|
473 |
} |
|
474 |
} |
|
475 |
||
476 |
static void |
|
477 |
gst_pad_template_get_property (GObject * object, guint prop_id, GValue * value, |
|
478 |
GParamSpec * pspec) |
|
479 |
{ |
|
480 |
/* these properties are all construct-only */ |
|
481 |
switch (prop_id) { |
|
482 |
case PROP_NAME_TEMPLATE: |
|
483 |
g_value_set_string (value, GST_PAD_TEMPLATE_NAME_TEMPLATE (object)); |
|
484 |
break; |
|
485 |
case PROP_DIRECTION: |
|
486 |
g_value_set_enum (value, GST_PAD_TEMPLATE_DIRECTION (object)); |
|
487 |
break; |
|
488 |
case PROP_PRESENCE: |
|
489 |
g_value_set_enum (value, GST_PAD_TEMPLATE_PRESENCE (object)); |
|
490 |
break; |
|
491 |
case PROP_CAPS: |
|
492 |
g_value_set_boxed (value, GST_PAD_TEMPLATE_CAPS (object)); |
|
493 |
break; |
|
494 |
default: |
|
495 |
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); |
|
496 |
break; |
|
497 |
} |
|
498 |
} |