author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 22 Jan 2010 09:59:59 +0200 | |
changeset 2 | 5505e8908944 |
parent 0 | 0e761a78d257 |
child 7 | 567bb019e3e3 |
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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#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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111 |
enum |
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112 |
{ |
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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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117 |
|
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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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120 |
|
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static void gst_pad_template_class_init (GstPadTemplateClass * klass); |
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static void gst_pad_template_init (GstPadTemplate * templ, |
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GstPadTemplateClass * klass); |
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static void gst_pad_template_dispose (GObject * object); |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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128 |
|
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129 |
|
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130 |
GType |
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gst_pad_template_get_type (void) |
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132 |
{ |
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static GType padtemplate_type = 0; |
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134 |
|
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if (G_UNLIKELY (padtemplate_type == 0)) { |
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static const GTypeInfo padtemplate_info = { |
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sizeof (GstPadTemplateClass), NULL, NULL, |
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(GClassInitFunc) gst_pad_template_class_init, NULL, NULL, |
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sizeof (GstPadTemplate), |
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140 |
0, |
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(GInstanceInitFunc) gst_pad_template_init, NULL |
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}; |
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143 |
|
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padtemplate_type = |
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g_type_register_static (GST_TYPE_OBJECT, "GstPadTemplate", |
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&padtemplate_info, 0); |
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} |
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return padtemplate_type; |
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} |
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150 |
|
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151 |
static void |
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gst_pad_template_class_init (GstPadTemplateClass * klass) |
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153 |
{ |
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154 |
GObjectClass *gobject_class; |
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GstObjectClass *gstobject_class; |
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156 |
|
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gobject_class = (GObjectClass *) klass; |
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gstobject_class = (GstObjectClass *) klass; |
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159 |
|
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parent_class = g_type_class_peek_parent (klass); |
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161 |
|
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162 |
/** |
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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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166 |
* |
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* This signal is fired when an element creates a pad from this template. |
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168 |
*/ |
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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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173 |
|
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gobject_class->dispose = gst_pad_template_dispose; |
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175 |
|
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gstobject_class->path_string_separator = "*"; |
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177 |
} |
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178 |
|
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179 |
static void |
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gst_pad_template_init (GstPadTemplate * templ, GstPadTemplateClass * klass) |
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181 |
{ |
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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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192 |
*/ |
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if (GST_OBJECT_IS_FLOATING (templ)) { |
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gst_object_ref (templ); |
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gst_object_sink (templ); |
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} |
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197 |
} |
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198 |
|
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199 |
static void |
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gst_pad_template_dispose (GObject * object) |
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201 |
{ |
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GstPadTemplate *templ = GST_PAD_TEMPLATE (object); |
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203 |
|
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g_free (GST_PAD_TEMPLATE_NAME_TEMPLATE (templ)); |
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205 |
if (GST_PAD_TEMPLATE_CAPS (templ)) { |
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gst_caps_unref (GST_PAD_TEMPLATE_CAPS (templ)); |
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|
207 |
} |
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|
208 |
|
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209 |
G_OBJECT_CLASS (parent_class)->dispose (object); |
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|
210 |
} |
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|
211 |
|
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|
212 |
/* ALWAYS padtemplates cannot have conversion specifications (like src_%d), |
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213 |
* since it doesn't make sense. |
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|
214 |
* SOMETIMES padtemplates can do whatever they want, they are provided by the |
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|
215 |
* element. |
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|
216 |
* REQUEST padtemplates can be reverse-parsed (the user asks for 'sink1', the |
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|
217 |
* 'sink%d' template is automatically selected), so we need to restrict their |
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|
218 |
* naming. |
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|
219 |
*/ |
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220 |
static gboolean |
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|
221 |
name_is_valid (const gchar * name, GstPadPresence presence) |
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|
222 |
{ |
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const gchar *str; |
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|
224 |
|
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|
225 |
if (presence == GST_PAD_ALWAYS) { |
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|
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if (strchr (name, '%')) { |
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|
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g_warning ("invalid name template %s: conversion specifications are not" |
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|
228 |
" allowed for GST_PAD_ALWAYS padtemplates", name); |
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|
229 |
return FALSE; |
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|
230 |
} |
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|
231 |
} else if (presence == GST_PAD_REQUEST) { |
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|
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if ((str = strchr (name, '%')) && strchr (str + 1, '%')) { |
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|
233 |
g_warning ("invalid name template %s: only one conversion specification" |
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|
234 |
" allowed in GST_PAD_REQUEST padtemplate", name); |
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|
235 |
return FALSE; |
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|
236 |
} |
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|
237 |
if (str && (*(str + 1) != 's' && *(str + 1) != 'd')) { |
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|
238 |
g_warning ("invalid name template %s: conversion specification must be of" |
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|
239 |
" type '%%d' or '%%s' for GST_PAD_REQUEST padtemplate", name); |
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|
240 |
return FALSE; |
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|
241 |
} |
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|
242 |
if (str && (*(str + 2) != '\0')) { |
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|
243 |
g_warning ("invalid name template %s: conversion specification must" |
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|
244 |
" appear at the end of the GST_PAD_REQUEST padtemplate name", name); |
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|
245 |
return FALSE; |
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|
246 |
} |
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|
247 |
} |
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|
248 |
|
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|
249 |
return TRUE; |
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|
250 |
} |
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|
251 |
#ifdef __SYMBIAN32__ |
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252 |
EXPORT_C |
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253 |
#endif |
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|
254 |
|
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|
255 |
|
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256 |
GType |
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|
257 |
gst_static_pad_template_get_type (void) |
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258 |
{ |
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static GType staticpadtemplate_type = 0; |
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260 |
|
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|
261 |
if (G_UNLIKELY (staticpadtemplate_type == 0)) { |
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|
262 |
staticpadtemplate_type = |
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g_pointer_type_register_static ("GstStaticPadTemplate"); |
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|
264 |
} |
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265 |
return staticpadtemplate_type; |
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|
266 |
} |
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|
267 |
|
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|
268 |
/** |
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|
269 |
* gst_static_pad_template_get: |
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|
270 |
* @pad_template: the static pad template |
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271 |
* |
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272 |
* Converts a #GstStaticPadTemplate into a #GstPadTemplate. |
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273 |
* |
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|
274 |
* Returns: a new #GstPadTemplate. |
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275 |
*/ |
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|
276 |
#ifdef __SYMBIAN32__ |
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277 |
EXPORT_C |
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278 |
#endif |
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|
279 |
|
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280 |
GstPadTemplate * |
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|
281 |
gst_static_pad_template_get (GstStaticPadTemplate * pad_template) |
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|
282 |
{ |
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|
283 |
GstPadTemplate *new; |
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|
284 |
|
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|
285 |
if (!name_is_valid (pad_template->name_template, pad_template->presence)) |
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|
286 |
return NULL; |
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|
287 |
|
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|
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new = g_object_new (gst_pad_template_get_type (), |
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|
289 |
"name", pad_template->name_template, NULL); |
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|
290 |
|
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|
291 |
GST_PAD_TEMPLATE_NAME_TEMPLATE (new) = g_strdup (pad_template->name_template); |
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|
292 |
GST_PAD_TEMPLATE_DIRECTION (new) = pad_template->direction; |
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|
293 |
GST_PAD_TEMPLATE_PRESENCE (new) = pad_template->presence; |
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|
294 |
|
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|
295 |
GST_PAD_TEMPLATE_CAPS (new) = |
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|
296 |
gst_caps_make_writable (gst_static_caps_get (&pad_template->static_caps)); |
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|
297 |
|
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|
298 |
return new; |
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|
299 |
} |
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|
300 |
|
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|
301 |
/** |
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|
302 |
* gst_pad_template_new: |
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|
303 |
* @name_template: the name template. |
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|
304 |
* @direction: the #GstPadDirection of the template. |
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|
305 |
* @presence: the #GstPadPresence of the pad. |
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|
306 |
* @caps: a #GstCaps set for the template. The caps are taken ownership of. |
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|
307 |
* |
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|
308 |
* Creates a new pad template with a name according to the given template |
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|
309 |
* 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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311 |
* |
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* Returns: a new #GstPadTemplate. |
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*/ |
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#ifdef __SYMBIAN32__ |
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315 |
EXPORT_C |
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316 |
#endif |
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GstPadTemplate * |
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gst_pad_template_new (const gchar * name_template, |
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GstPadDirection direction, GstPadPresence presence, GstCaps * caps) |
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320 |
{ |
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GstPadTemplate *new; |
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322 |
|
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g_return_val_if_fail (name_template != NULL, NULL); |
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g_return_val_if_fail (caps != NULL, NULL); |
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g_return_val_if_fail (direction == GST_PAD_SRC |
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|| direction == GST_PAD_SINK, NULL); |
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g_return_val_if_fail (presence == GST_PAD_ALWAYS |
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|| presence == GST_PAD_SOMETIMES || presence == GST_PAD_REQUEST, NULL); |
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329 |
|
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if (!name_is_valid (name_template, presence)) { |
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gst_caps_unref (caps); |
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return NULL; |
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} |
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334 |
|
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new = g_object_new (gst_pad_template_get_type (), |
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"name", name_template, NULL); |
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337 |
|
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GST_PAD_TEMPLATE_NAME_TEMPLATE (new) = g_strdup (name_template); |
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GST_PAD_TEMPLATE_DIRECTION (new) = direction; |
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GST_PAD_TEMPLATE_PRESENCE (new) = presence; |
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GST_PAD_TEMPLATE_CAPS (new) = caps; |
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342 |
|
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return new; |
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344 |
} |
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345 |
|
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346 |
/** |
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* gst_static_pad_template_get_caps: |
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* @templ: a #GstStaticPadTemplate to get capabilities of. |
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349 |
* |
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* Gets the capabilities of the static pad template. |
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351 |
* |
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352 |
* Returns: the #GstCaps of the static pad template. If you need to keep a |
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* reference to the caps, take a ref (see gst_caps_ref ()). |
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354 |
*/ |
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355 |
#ifdef __SYMBIAN32__ |
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356 |
EXPORT_C |
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357 |
#endif |
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358 |
|
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359 |
GstCaps * |
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360 |
gst_static_pad_template_get_caps (GstStaticPadTemplate * templ) |
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361 |
{ |
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g_return_val_if_fail (templ, NULL); |
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363 |
|
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return (GstCaps *) gst_static_caps_get (&templ->static_caps); |
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365 |
} |
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366 |
|
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367 |
/** |
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* gst_pad_template_get_caps: |
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369 |
* @templ: a #GstPadTemplate to get capabilities of. |
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370 |
* |
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371 |
* Gets the capabilities of the pad template. |
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372 |
* |
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* Returns: the #GstCaps of the pad template. If you need to keep a reference to |
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374 |
* the caps, take a ref (see gst_caps_ref ()). |
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375 |
*/ |
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376 |
#ifdef __SYMBIAN32__ |
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377 |
EXPORT_C |
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378 |
#endif |
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379 |
|
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380 |
GstCaps * |
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381 |
gst_pad_template_get_caps (GstPadTemplate * templ) |
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382 |
{ |
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g_return_val_if_fail (GST_IS_PAD_TEMPLATE (templ), NULL); |
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|
384 |
|
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385 |
return GST_PAD_TEMPLATE_CAPS (templ); |
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|
386 |
} |
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|
387 |
|
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388 |
/** |
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389 |
* gst_pad_template_pad_created: |
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390 |
* @templ: a #GstPadTemplate that has been created |
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391 |
* @pad: the #GstPad that created it |
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392 |
* |
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393 |
* Emit the pad-created signal for this template when created by this pad. |
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394 |
*/ |
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|
395 |
#ifdef __SYMBIAN32__ |
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396 |
EXPORT_C |
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|
397 |
#endif |
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|
398 |
|
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399 |
void |
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400 |
gst_pad_template_pad_created (GstPadTemplate * templ, GstPad * pad) |
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401 |
{ |
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402 |
g_signal_emit (G_OBJECT (templ), |
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|
403 |
gst_pad_template_signals[TEMPL_PAD_CREATED], 0, pad); |
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|
404 |
} |