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inlined two more docs factored gstpadtemplate out of gstpad

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Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
* docs/gst/tmpl/.cvsignore:
* docs/gst/tmpl/gstpad.sgml:
* docs/gst/tmpl/gstpadtemplate.sgml:
* gst/Makefile.am:
* gst/gstpad.c: (gst_pad_class_init), (gst_pad_dispose),
(gst_pad_finalize), (gst_pad_set_pad_template):
* gst/gstpad.h:
* gst/gstpadtemplate.c: (gst_pad_template_get_type),
(gst_pad_template_class_init), (gst_pad_template_init),
(gst_pad_template_dispose), (name_is_valid),
(gst_static_pad_template_get), (gst_pad_template_new),
(gst_static_pad_template_get_caps), (gst_pad_template_get_caps),
(gst_pad_template_pad_created):
* gst/gstpadtemplate.h:
inlined two more docs
factored gstpadtemplate out of gstpad
This commit is contained in:
Stefan Kost 2005-09-25 11:19:22 +00:00
parent 4ed6212a26
commit 41aca72772
10 changed files with 701 additions and 1855 deletions
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20
ChangeLog
View file

@ -1,3 +1,23 @@
2005-09-25 Stefan Kost <ensonic@users.sf.net>
* docs/gst/gstreamer-sections.txt:
* docs/gst/tmpl/.cvsignore:
* docs/gst/tmpl/gstpad.sgml:
* docs/gst/tmpl/gstpadtemplate.sgml:
* gst/Makefile.am:
* gst/gstpad.c: (gst_pad_class_init), (gst_pad_dispose),
(gst_pad_finalize), (gst_pad_set_pad_template):
* gst/gstpad.h:
* gst/gstpadtemplate.c: (gst_pad_template_get_type),
(gst_pad_template_class_init), (gst_pad_template_init),
(gst_pad_template_dispose), (name_is_valid),
(gst_static_pad_template_get), (gst_pad_template_new),
(gst_static_pad_template_get_caps), (gst_pad_template_get_caps),
(gst_pad_template_pad_created):
* gst/gstpadtemplate.h:
inlined two more docs
factored gstpadtemplate out of gstpad
2005-09-24 Tim-Philipp Müller <tim at centricular dot net> 2005-09-24 Tim-Philipp Müller <tim at centricular dot net>
* check/gst/gstbin.c: (test_children_state_change_order_flagged_sink), * check/gst/gstbin.c: (test_children_state_change_order_flagged_sink),

6
docs/gst/gstreamer-sections.txt
View file

@ -1137,7 +1137,6 @@ GstPadDispatcherFunction
GstPadDirection GstPadDirection
GstPadFlags GstPadFlags
GstPadLinkReturn GstPadLinkReturn
GstPadPresence
GstFlowReturn GstFlowReturn
GstActivateMode GstActivateMode
@ -1297,7 +1296,6 @@ GST_PAD_SET_FLUSHING
GST_PAD_TASK GST_PAD_TASK
GST_PAD_UNSET_FLUSHING GST_PAD_UNSET_FLUSHING
GST_PAD_ACCEPTCAPSFUNC GST_PAD_ACCEPTCAPSFUNC
GST_PAD_ACTIVATEFUNC GST_PAD_ACTIVATEFUNC
GST_PAD_ACTIVATEPULLFUNC GST_PAD_ACTIVATEPULLFUNC
@ -1331,10 +1329,12 @@ GST_PAD_TEMPLATE_PRESENCE
GST_PAD_TEMPLATE_CAPS GST_PAD_TEMPLATE_CAPS
GST_PAD_TEMPLATE_IS_FIXED GST_PAD_TEMPLATE_IS_FIXED
GstPadTemplateFlags GstPadTemplateFlags
GstPadPresence
gst_pad_template_new gst_pad_template_new
gst_static_pad_template_get gst_static_pad_template_get
gst_static_pad_template_get_caps gst_static_pad_template_get_caps
gst_pad_template_get_caps gst_pad_template_get_caps
<SUBSECTION Standard> <SUBSECTION Standard>
GstPadTemplateClass GstPadTemplateClass
GST_PAD_TEMPLATE GST_PAD_TEMPLATE
@ -1344,9 +1344,11 @@ GST_IS_PAD_TEMPLATE_CLASS
GST_STATIC_PAD_TEMPLATE GST_STATIC_PAD_TEMPLATE
GST_TYPE_PAD_TEMPLATE GST_TYPE_PAD_TEMPLATE
GST_TYPE_PAD_TEMPLATE_FLAGS GST_TYPE_PAD_TEMPLATE_FLAGS
<SUBSECTION Private> <SUBSECTION Private>
gst_pad_template_get_type gst_pad_template_get_type
gst_pad_template_flags_get_type gst_pad_template_flags_get_type
gst_pad_template_pad_created
</SECTION> </SECTION>

2
docs/gst/tmpl/.gitignore vendored
View file

@ -38,6 +38,8 @@ gstmemchunk.sgml
gstmessage.sgml gstmessage.sgml
gstminiobject.sgml gstminiobject.sgml
gstobject.sgml gstobject.sgml
gstpad.sgml
gstpadtemplate.sgml
gstparse.sgml gstparse.sgml
gstpluginfeature.sgml gstpluginfeature.sgml
gstpushsrc.sgml gstpushsrc.sgml

1338
docs/gst/tmpl/gstpad.sgml
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File diff suppressed because it is too large Load diff

202
docs/gst/tmpl/gstpadtemplate.sgml
View file

@ -1,202 +0,0 @@
<!-- ##### SECTION Title ##### -->
GstPadTemplate
<!-- ##### SECTION Short_Description ##### -->
Describe the media type of a pad.
<!-- ##### SECTION Long_Description ##### -->
<para>
Padtemplates describe the possible media types a pad or an elementfactory can
handle.
</para>
<para>
Pad and PadTemplates have #GstCaps attached to it to describe the media type they
are capable of dealing with. gst_pad_template_get_caps() is used to get the
caps of a padtemplate. It's not possible to modify the caps of a padtemplate after
creation.
</para>
<para>
Padtemplates can be created with gst_pad_template_new() or with the convenient
GST_PAD_TEMPLATE_FACTORY() macro. A padtemplate can be used to create a pad or
to add to an elementfactory.
</para>
<para>
The following code example shows the code to create a pad from a padtemplate.
<example>
<title>Create a pad from a padtemplate</title>
<programlisting>
GstStaticPadTemplate my_template =
GST_STATIC_PAD_TEMPLATE (
"sink", /* the name of the pad */
GST_PAD_SINK, /* the direction of the pad */
GST_PAD_ALWAYS, /* when this pad will be present */
GST_STATIC_CAPS ( /* the capabilities of the padtemplate */
"audio/x-raw-int, "
"channels = (int) [ 1, 6 ]"
)
)
void
my_method (void)
{
GstPad *pad;
pad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (my_template_factory), "sink");
...
}
</programlisting>
</example>
</para>
<para>
The following example shows you how to add the padtemplate to an elementfactory:
<programlisting>
gboolean
my_factory_init (GstPlugin *plugin)
{
GstElementFactory *factory;
factory = gst_element_factory_new ("my_factory", GST_TYPE_MYFACTORY, &amp;gst_myfactory_details);
g_return_val_if_fail (factory != NULL, FALSE);
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (my_template_factory));
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
return TRUE;
}
</programlisting>
</para>
<!-- ##### SECTION See_Also ##### -->
<para>
#GstPad, #GstElementFactory
</para>
<!-- ##### SECTION Stability_Level ##### -->
<!-- ##### STRUCT GstPadTemplate ##### -->
<para>
The padtemplate object.
</para>
<!-- ##### SIGNAL GstPadTemplate::pad-created ##### -->
<para>
This signal is fired when an element creates a pad from this
template.
</para>
@gstpadtemplate: the object which received the signal.
@arg1: The pad that was created.
<!-- ##### STRUCT GstStaticPadTemplate ##### -->
<para>
</para>
@name_template:
@direction:
@presence:
@static_caps:
<!-- ##### MACRO GST_IS_PAD_FAST ##### -->
<para>
</para>
@obj:
<!-- ##### MACRO GST_PAD_TEMPLATE_NAME_TEMPLATE ##### -->
<para>
Get the nametemplate of the padtemplate.
</para>
@templ: the template to query
<!-- ##### MACRO GST_PAD_TEMPLATE_DIRECTION ##### -->
<para>
Get the direction of the padtemplate.
</para>
@templ: the template to query
<!-- ##### MACRO GST_PAD_TEMPLATE_PRESENCE ##### -->
<para>
Get the presence of the padtemplate.
</para>
@templ: the template to query
<!-- ##### MACRO GST_PAD_TEMPLATE_CAPS ##### -->
<para>
Get a handle to the padtemplate #GstCaps
</para>
@templ: the template to query
<!-- ##### MACRO GST_PAD_TEMPLATE_IS_FIXED ##### -->
<para>
Check if the properties of the padtemplate are fixed
</para>
@templ: the template to query
<!-- ##### ENUM GstPadTemplateFlags ##### -->
<para>
Flags for the padtemplate
</para>
@GST_PAD_TEMPLATE_FIXED: the padtemplate has no variable properties
@GST_PAD_TEMPLATE_FLAG_LAST: first flag that can be used by subclasses.
<!-- ##### FUNCTION gst_pad_template_new ##### -->
<para>
</para>
@name_template:
@direction:
@presence:
@caps:
@Returns:
<!-- # Unused Parameters # -->
@Varargs:
<!-- ##### FUNCTION gst_static_pad_template_get ##### -->
<para>
</para>
@pad_template:
@Returns:
<!-- # Unused Parameters # -->
@templ:
<!-- ##### FUNCTION gst_static_pad_template_get_caps ##### -->
<para>
</para>
@templ:
@Returns:
<!-- ##### FUNCTION gst_pad_template_get_caps ##### -->
<para>
</para>
@templ:
@Returns:

2
gst/Makefile.am
View file

@ -91,6 +91,7 @@ libgstreamer_@GST_MAJORMINOR@_la_SOURCES = \
gstmessage.c \ gstmessage.c \
gstminiobject.c \ gstminiobject.c \
gstpad.c \ gstpad.c \
gstpadtemplate.c \
gstpipeline.c \ gstpipeline.c \
gstplugin.c \ gstplugin.c \
gstpluginfeature.c \ gstpluginfeature.c \
@ -168,6 +169,7 @@ gst_headers = \
gstmessage.h \ gstmessage.h \
gstminiobject.h \ gstminiobject.h \
gstpad.h \ gstpad.h \
gstpadtemplate.h \
gstpipeline.h \ gstpipeline.h \
gstplugin.h \ gstplugin.h \
gstpluginfeature.h \ gstpluginfeature.h \

285
gst/gstpad.c
View file

@ -19,10 +19,52 @@
* Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA. * Boston, MA 02111-1307, USA.
*/ */
/**
* SECTION:gstpad
* @short_description: Object contained by elements that allows links to other elements
* @see_also: #GstPadTemplate, #GstElement, #GstEvent
*
* A #GstElement is linked to other elements via "pads", which are extremely
* light-weight generic link points.
* After two pads are retrieved from an element with gst_element_get_pad(),
* the pads can be link with gst_pad_link(). (For quick links,
* you can also use gst_element_link(), which will make the obvious
* link for you if it's straightforward.)
*
* Pads are typically created from a #GstPadTemplate with
* gst_pad_new_from_template().
*
* Pads have #GstCaps attached to it to describe the media type they are capable
* of dealing with.
* gst_pad_get_caps() and gst_pad_try_set_caps() are used to manipulate the caps
* of the pads.
* Pads created from a pad template cannot set capabilities that are
* incompatible with the pad template capabilities.
*
* Pads without pad templates can be created with gst_pad_new(),
* which takes a direction and a name as an argument. If the name is NULL,
* then a guaranteed unique name will be assigned to it.
*
* gst_pad_get_parent() will retrieve the #GstElement that owns the pad.
*
* A #GstElement creating a pad will typically use the various
* gst_pad_set_*_function() calls to register callbacks for various events
* on the pads.
*
* GstElements will use gst_pad_push() and gst_pad_pull() to push out
* or pull in a buffer.
* gst_pad_select() and gst_pad_selectv() are used by plugins to wait for the
* first incoming buffer or event on any of the given set of pads.
*
* To send a #GstEvent on a pad, use gst_pad_send_event().
*
* Last reviewed on December 13th, 2002 (0.5.0.1)
*/
#include "gst_private.h" #include "gst_private.h"
#include "gstpad.h" #include "gstpad.h"
#include "gstpadtemplate.h"
#include "gstenumtypes.h" #include "gstenumtypes.h"
#include "gstmarshal.h" #include "gstmarshal.h"
#include "gstutils.h" #include "gstutils.h"
@ -44,16 +86,6 @@ GST_DEBUG_CATEGORY_STATIC (debug_dataflow);
}G_STMT_END }G_STMT_END
#define GST_CAT_DEFAULT GST_CAT_PADS #define GST_CAT_DEFAULT GST_CAT_PADS
enum
{
TEMPL_PAD_CREATED,
/* FILL ME */
TEMPL_LAST_SIGNAL
};
static GstObject *padtemplate_parent_class = NULL;
static guint gst_pad_template_signals[TEMPL_LAST_SIGNAL] = { 0 };
/* Pad signals and args */ /* Pad signals and args */
enum enum
{ {
@ -62,7 +94,7 @@ enum
PAD_REQUEST_LINK, PAD_REQUEST_LINK,
PAD_HAVE_DATA, PAD_HAVE_DATA,
/* FILL ME */ /* FILL ME */
PAD_LAST_SIGNAL LAST_SIGNAL
}; };
enum enum
@ -93,8 +125,8 @@ static gboolean gst_pad_activate_default (GstPad * pad);
static xmlNodePtr gst_pad_save_thyself (GstObject * object, xmlNodePtr parent); static xmlNodePtr gst_pad_save_thyself (GstObject * object, xmlNodePtr parent);
#endif #endif
static GstObjectClass *pad_parent_class = NULL; static GstObjectClass *parent_class = NULL;
static guint gst_pad_signals[PAD_LAST_SIGNAL] = { 0 }; static guint gst_pad_signals[LAST_SIGNAL] = { 0 };
static GQuark buffer_quark; static GQuark buffer_quark;
static GQuark event_quark; static GQuark event_quark;
@ -152,7 +184,7 @@ gst_pad_class_init (GstPadClass * klass)
gobject_class = (GObjectClass *) klass; gobject_class = (GObjectClass *) klass;
gstobject_class = (GstObjectClass *) klass; gstobject_class = (GstObjectClass *) klass;
pad_parent_class = g_type_class_ref (GST_TYPE_OBJECT); parent_class = g_type_class_ref (GST_TYPE_OBJECT);
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_pad_dispose); gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_pad_dispose);
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_pad_finalize); gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_pad_finalize);
@ -295,7 +327,7 @@ gst_pad_dispose (GObject * object)
gst_element_remove_pad (GST_ELEMENT (GST_OBJECT_PARENT (pad)), pad); gst_element_remove_pad (GST_ELEMENT (GST_OBJECT_PARENT (pad)), pad);
} }
G_OBJECT_CLASS (pad_parent_class)->dispose (object); G_OBJECT_CLASS (parent_class)->dispose (object);
} }
static void static void
@ -327,7 +359,7 @@ gst_pad_finalize (GObject * object)
pad->block_cond = NULL; pad->block_cond = NULL;
} }
G_OBJECT_CLASS (pad_parent_class)->finalize (object); G_OBJECT_CLASS (parent_class)->finalize (object);
} }
static void static void
@ -1628,11 +1660,8 @@ gst_pad_set_pad_template (GstPad * pad, GstPadTemplate * templ)
gst_object_replace ((GstObject **) & pad->padtemplate, (GstObject *) templ); gst_object_replace ((GstObject **) & pad->padtemplate, (GstObject *) templ);
GST_UNLOCK (pad); GST_UNLOCK (pad);
if (templ) { if (templ)
gst_object_sink (GST_OBJECT (templ)); gst_pad_template_pad_created (templ, pad);
g_signal_emit (G_OBJECT (templ),
gst_pad_template_signals[TEMPL_PAD_CREATED], 0, pad);
}
} }
/** /**
@ -3487,220 +3516,6 @@ dropping:
} }
} }
/************************************************************************
*
* templates
*
*/
static void gst_pad_template_class_init (GstPadTemplateClass * klass);
static void gst_pad_template_init (GstPadTemplate * templ);
static void gst_pad_template_dispose (GObject * object);
GType
gst_pad_template_get_type (void)
{
static GType padtemplate_type = 0;
if (!padtemplate_type) {
static const GTypeInfo padtemplate_info = {
sizeof (GstPadTemplateClass), NULL, NULL,
(GClassInitFunc) gst_pad_template_class_init, NULL, NULL,
sizeof (GstPadTemplate),
0,
(GInstanceInitFunc) gst_pad_template_init, NULL
};
padtemplate_type =
g_type_register_static (GST_TYPE_OBJECT, "GstPadTemplate",
&padtemplate_info, 0);
}
return padtemplate_type;
}
static void
gst_pad_template_class_init (GstPadTemplateClass * klass)
{
GObjectClass *gobject_class;
GstObjectClass *gstobject_class;
gobject_class = (GObjectClass *) klass;
gstobject_class = (GstObjectClass *) klass;
padtemplate_parent_class = g_type_class_ref (GST_TYPE_OBJECT);
gst_pad_template_signals[TEMPL_PAD_CREATED] =
g_signal_new ("pad-created", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstPadTemplateClass, pad_created),
NULL, NULL, gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD);
gobject_class->dispose = gst_pad_template_dispose;
gstobject_class->path_string_separator = "*";
}
static void
gst_pad_template_init (GstPadTemplate * templ)
{
}
static void
gst_pad_template_dispose (GObject * object)
{
GstPadTemplate *templ = GST_PAD_TEMPLATE (object);
g_free (GST_PAD_TEMPLATE_NAME_TEMPLATE (templ));
if (GST_PAD_TEMPLATE_CAPS (templ)) {
gst_caps_unref (GST_PAD_TEMPLATE_CAPS (templ));
}
G_OBJECT_CLASS (padtemplate_parent_class)->dispose (object);
}
/* ALWAYS padtemplates cannot have conversion specifications (like src_%d),
* since it doesn't make sense.
* SOMETIMES padtemplates can do whatever they want, they are provided by the
* element.
* REQUEST padtemplates can be reverse-parsed (the user asks for 'sink1', the
* 'sink%d' template is automatically selected), so we need to restrict their
* naming.
*/
static gboolean
name_is_valid (const gchar * name, GstPadPresence presence)
{
const gchar *str;
if (presence == GST_PAD_ALWAYS) {
if (strchr (name, '%')) {
g_warning ("invalid name template %s: conversion specifications are not"
" allowed for GST_PAD_ALWAYS padtemplates", name);
return FALSE;
}
} else if (presence == GST_PAD_REQUEST) {
if ((str = strchr (name, '%')) && strchr (str + 1, '%')) {
g_warning ("invalid name template %s: only one conversion specification"
" allowed in GST_PAD_REQUEST padtemplate", name);
return FALSE;
}
if (str && (*(str + 1) != 's' && *(str + 1) != 'd')) {
g_warning ("invalid name template %s: conversion specification must be of"
" type '%%d' or '%%s' for GST_PAD_REQUEST padtemplate", name);
return FALSE;
}
if (str && (*(str + 2) != '\0')) {
g_warning ("invalid name template %s: conversion specification must"
" appear at the end of the GST_PAD_REQUEST padtemplate name", name);
return FALSE;
}
}
return TRUE;
}
/**
* gst_static_pad_template_get:
* @pad_template: the static pad template
*
* Converts a #GstStaticPadTemplate into a #GstPadTemplate.
*
* Returns: a new #GstPadTemplate.
*/
GstPadTemplate *
gst_static_pad_template_get (GstStaticPadTemplate * pad_template)
{
GstPadTemplate *new;
if (!name_is_valid (pad_template->name_template, pad_template->presence))
return NULL;
new = g_object_new (gst_pad_template_get_type (),
"name", pad_template->name_template, NULL);
GST_PAD_TEMPLATE_NAME_TEMPLATE (new) = g_strdup (pad_template->name_template);
GST_PAD_TEMPLATE_DIRECTION (new) = pad_template->direction;
GST_PAD_TEMPLATE_PRESENCE (new) = pad_template->presence;
GST_PAD_TEMPLATE_CAPS (new) =
gst_caps_copy (gst_static_caps_get (&pad_template->static_caps));
return new;
}
/**
* gst_pad_template_new:
* @name_template: the name template.
* @direction: the #GstPadDirection of the template.
* @presence: the #GstPadPresence of the pad.
* @caps: a #GstCaps set for the template. The caps are taken ownership of.
*
* Creates a new pad template with a name according to the given template
* and with the given arguments. This functions takes ownership of the provided
* caps, so be sure to not use them afterwards.
*
* Returns: a new #GstPadTemplate.
*/
GstPadTemplate *
gst_pad_template_new (const gchar * name_template,
GstPadDirection direction, GstPadPresence presence, GstCaps * caps)
{
GstPadTemplate *new;
g_return_val_if_fail (name_template != NULL, NULL);
g_return_val_if_fail (caps != NULL, NULL);
g_return_val_if_fail (direction == GST_PAD_SRC
|| direction == GST_PAD_SINK, NULL);
g_return_val_if_fail (presence == GST_PAD_ALWAYS
|| presence == GST_PAD_SOMETIMES || presence == GST_PAD_REQUEST, NULL);
if (!name_is_valid (name_template, presence)) {
gst_caps_unref (caps);
return NULL;
}
new = g_object_new (gst_pad_template_get_type (),
"name", name_template, NULL);
GST_PAD_TEMPLATE_NAME_TEMPLATE (new) = g_strdup (name_template);
GST_PAD_TEMPLATE_DIRECTION (new) = direction;
GST_PAD_TEMPLATE_PRESENCE (new) = presence;
GST_PAD_TEMPLATE_CAPS (new) = caps;
return new;
}
/**
* gst_static_pad_template_get_caps:
* @templ: a #GstStaticPadTemplate to get capabilities of.
*
* Gets the capabilities of the static pad template.
*
* Returns: the #GstCaps of the static pad template. If you need to keep a
* reference to the caps, take a ref (see gst_caps_ref ()).
*/
GstCaps *
gst_static_pad_template_get_caps (GstStaticPadTemplate * templ)
{
g_return_val_if_fail (templ, NULL);
return (GstCaps *) gst_static_caps_get (&templ->static_caps);
}
/**
* gst_pad_template_get_caps:
* @templ: a #GstPadTemplate to get capabilities of.
*
* Gets the capabilities of the pad template.
*
* Returns: the #GstCaps of the pad template. If you need to keep a reference to
* the caps, take a ref (see gst_caps_ref ()).
*/
GstCaps *
gst_pad_template_get_caps (GstPadTemplate * templ)
{
g_return_val_if_fail (GST_IS_PAD_TEMPLATE (templ), NULL);
return GST_PAD_TEMPLATE_CAPS (templ);
}
/** /**
* gst_pad_set_element_private: * gst_pad_set_element_private:
* @pad: the #GstPad to set the private data of. * @pad: the #GstPad to set the private data of.

196
gst/gstpad.h
View file

@ -52,10 +52,6 @@ GST_EXPORT GType _gst_pad_type;
typedef struct _GstPad GstPad; typedef struct _GstPad GstPad;
typedef struct _GstPadClass GstPadClass; typedef struct _GstPadClass GstPadClass;
typedef struct _GstPadTemplate GstPadTemplate;
typedef struct _GstPadTemplateClass GstPadTemplateClass;
typedef struct _GstStaticPadTemplate GstStaticPadTemplate;
/** /**
* GstPadLinkReturn: * GstPadLinkReturn:
* @GST_PAD_LINK_OK : link succeeded * @GST_PAD_LINK_OK : link succeeded
@ -76,7 +72,22 @@ typedef enum {
GST_PAD_LINK_REFUSED = -6, GST_PAD_LINK_REFUSED = -6,
} GstPadLinkReturn; } GstPadLinkReturn;
/**
* GST_PAD_LINK_FAILED:
* @ret: the #GstPadLinkReturn value
*
* Macro to test if the given #GstPadLinkReturn value indicates a failed
* negotiation step (REFUSED/DELAYED).
*/
#define GST_PAD_LINK_FAILED(ret) ((ret) < GST_PAD_LINK_OK) #define GST_PAD_LINK_FAILED(ret) ((ret) < GST_PAD_LINK_OK)
/**
* GST_PAD_LINK_SUCCESSFUL:
* @ret: the #GstPadLinkReturn value
*
* Macro to test if the given #GstPadLinkReturn value indicates a successfull
* negotiation step (OK/DONE).
*/
#define GST_PAD_LINK_SUCCESSFUL(ret) ((ret) >= GST_PAD_LINK_OK) #define GST_PAD_LINK_SUCCESSFUL(ret) ((ret) >= GST_PAD_LINK_OK)
typedef enum { typedef enum {
@ -106,38 +117,136 @@ typedef enum {
typedef gboolean (*GstPadActivateFunction) (GstPad *pad); typedef gboolean (*GstPadActivateFunction) (GstPad *pad);
typedef gboolean (*GstPadActivateModeFunction) (GstPad *pad, gboolean active); typedef gboolean (*GstPadActivateModeFunction) (GstPad *pad, gboolean active);
/* data passing */ /* data passing */
/**
* GstPadChainFunction:
* @pad: the #GstPad that performed the chain.
* @buffer: the #GstBuffer that is chained.
*
* A function that will be called when chaining buffers.
*
*
*/
typedef GstFlowReturn (*GstPadChainFunction) (GstPad *pad, GstBuffer *buffer); typedef GstFlowReturn (*GstPadChainFunction) (GstPad *pad, GstBuffer *buffer);
typedef GstFlowReturn (*GstPadGetRangeFunction) (GstPad *pad, guint64 offset, typedef GstFlowReturn (*GstPadGetRangeFunction) (GstPad *pad, guint64 offset,
guint length, GstBuffer **buffer); guint length, GstBuffer **buffer);
/**
* GstPadEventFunction:
* @pad: the #GstPad to handle the event.
* @event: the #GstEvent to handle.
*
* Function signature to handle an event for the pad.
*
* Returns: TRUE if the pad could handle the event.
*/
typedef gboolean (*GstPadEventFunction) (GstPad *pad, GstEvent *event); typedef gboolean (*GstPadEventFunction) (GstPad *pad, GstEvent *event);
/* deprecate me, check range should use seeking query */ /* deprecate me, check range should use seeking query */
typedef gboolean (*GstPadCheckGetRangeFunction) (GstPad *pad); typedef gboolean (*GstPadCheckGetRangeFunction) (GstPad *pad);
/* internal links */ /* internal links */
/**
* GstPadIntLinkFunction:
* @pad: The #GstPad to query.
*
* The signature of the internal pad link function.
*
* Returns: a newly allocated #GList of pads that are linked to the given pad on
* the inside of the parent element.
* The caller must call g_list_free() on it after use.
*
*/
typedef GList* (*GstPadIntLinkFunction) (GstPad *pad); typedef GList* (*GstPadIntLinkFunction) (GstPad *pad);
/* generic query function */ /* generic query function */
/**
* GstPadQueryTypeFunction:
* @pad: a #GstPad to query
*
* The signature of the query types function.
*
* Returns: an array of query types
*/
typedef const GstQueryType* (*GstPadQueryTypeFunction) (GstPad *pad); typedef const GstQueryType* (*GstPadQueryTypeFunction) (GstPad *pad);
/**
* GstPadQueryFunction:
* @pad: the #GstPad to query.
* @query: the #GstQuery object to execute
*
* The signature of the query function.
*
* Returns: TRUE if the query could be performed.
*/
typedef gboolean (*GstPadQueryFunction) (GstPad *pad, GstQuery *query); typedef gboolean (*GstPadQueryFunction) (GstPad *pad, GstQuery *query);
/* linking */ /* linking */
/**
* GstPadLinkFunction
* @pad: the #GstPad that is linked.
* @peer: the peer #GstPad of the link
*
* Function signature to handle a new link on the pad.
*
* Returns: the result of the link with the specified peer.
*/
typedef GstPadLinkReturn (*GstPadLinkFunction) (GstPad *pad, GstPad *peer); typedef GstPadLinkReturn (*GstPadLinkFunction) (GstPad *pad, GstPad *peer);
/**
* GstPadUnlinkFunction
* @pad: the #GstPad that is linked.
*
* Function signature to handle a unlinking the pad prom its peer.
*/
typedef void (*GstPadUnlinkFunction) (GstPad *pad); typedef void (*GstPadUnlinkFunction) (GstPad *pad);
/* caps nego */ /* caps nego */
/**
* GstPadGetCapsFunction:
* @pad: the #GstPad to get the capabilities of.
*
* Returns a copy of the capabilities of the specified pad. By default this
* function will return the pad template capabilities, but can optionally
* be overridden.
*
* Returns: a newly allocated copy #GstCaps of the pad.
*/
typedef GstCaps* (*GstPadGetCapsFunction) (GstPad *pad); typedef GstCaps* (*GstPadGetCapsFunction) (GstPad *pad);
typedef gboolean (*GstPadSetCapsFunction) (GstPad *pad, GstCaps *caps); typedef gboolean (*GstPadSetCapsFunction) (GstPad *pad, GstCaps *caps);
typedef gboolean (*GstPadAcceptCapsFunction) (GstPad *pad, GstCaps *caps); typedef gboolean (*GstPadAcceptCapsFunction) (GstPad *pad, GstCaps *caps);
typedef void (*GstPadFixateCapsFunction) (GstPad *pad, GstCaps *caps); typedef void (*GstPadFixateCapsFunction) (GstPad *pad, GstCaps *caps);
typedef GstFlowReturn (*GstPadBufferAllocFunction) (GstPad *pad, guint64 offset, guint size, typedef GstFlowReturn (*GstPadBufferAllocFunction) (GstPad *pad, guint64 offset, guint size,
GstCaps *caps, GstBuffer **buf); GstCaps *caps, GstBuffer **buf);
/* misc */ /* misc */
/**
* GstPadDispatcherFunction:
* @pad: the #GstPad that is dispatched.
* @data: the gpointer to optional user data.
*
* A dispatcher function is called for all internally linked pads, see
* gst_pad_dispatcher().
*
* Returns: TRUE if the dispatching procedure has to be stopped.
*/
typedef gboolean (*GstPadDispatcherFunction) (GstPad *pad, gpointer data); typedef gboolean (*GstPadDispatcherFunction) (GstPad *pad, gpointer data);
typedef void (*GstPadBlockCallback) (GstPad *pad, gboolean blocked, gpointer user_data); typedef void (*GstPadBlockCallback) (GstPad *pad, gboolean blocked, gpointer user_data);
/**
* GstPadDirection:
* @GST_PAD_UNKNOWN: direction is unknown.
* @GST_PAD_SRC: the pad is a source pad.
* @GST_PAD_SINK: the pad is a sink pad.
*
* The direction of a pad.
*/
typedef enum { typedef enum {
GST_PAD_UNKNOWN, GST_PAD_UNKNOWN,
GST_PAD_SRC, GST_PAD_SRC,
@ -153,6 +262,9 @@ typedef enum {
GST_PAD_FLAG_LAST = GST_OBJECT_FLAG_LAST + 8 GST_PAD_FLAG_LAST = GST_OBJECT_FLAG_LAST + 8
} GstPadFlags; } GstPadFlags;
/* FIXME: this awful circular dependency need to be resolved properly (see padtemplate.h) */
typedef struct _GstPadTemplate GstPadTemplate;
struct _GstPad { struct _GstPad {
GstObject object; GstObject object;
@ -306,67 +418,8 @@ struct _GstPadClass {
#define GST_PAD_BLOCK_WAIT(pad) (g_cond_wait(GST_PAD_BLOCK_GET_COND (pad), GST_GET_LOCK (pad))) #define GST_PAD_BLOCK_WAIT(pad) (g_cond_wait(GST_PAD_BLOCK_GET_COND (pad), GST_GET_LOCK (pad)))
#define GST_PAD_BLOCK_SIGNAL(pad) (g_cond_signal(GST_PAD_BLOCK_GET_COND (pad))) #define GST_PAD_BLOCK_SIGNAL(pad) (g_cond_signal(GST_PAD_BLOCK_GET_COND (pad)))
/***** PadTemplate *****/ /* FIXME: this awful circular dependency need to be resolved properly (see padtemplate.h) */
#define GST_TYPE_PAD_TEMPLATE (gst_pad_template_get_type ()) #include <gst/gstpadtemplate.h>
#define GST_PAD_TEMPLATE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PAD_TEMPLATE,GstPadTemplate))
#define GST_PAD_TEMPLATE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PAD_TEMPLATE,GstPadTemplateClass))
#define GST_IS_PAD_TEMPLATE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PAD_TEMPLATE))
#define GST_IS_PAD_TEMPLATE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_PAD_TEMPLATE))
typedef enum {
GST_PAD_ALWAYS,
GST_PAD_SOMETIMES,
GST_PAD_REQUEST
} GstPadPresence;
#define GST_PAD_TEMPLATE_NAME_TEMPLATE(templ) (((GstPadTemplate *)(templ))->name_template)
#define GST_PAD_TEMPLATE_DIRECTION(templ) (((GstPadTemplate *)(templ))->direction)
#define GST_PAD_TEMPLATE_PRESENCE(templ) (((GstPadTemplate *)(templ))->presence)
#define GST_PAD_TEMPLATE_CAPS(templ) (((GstPadTemplate *)(templ))->caps)
typedef enum {
GST_PAD_TEMPLATE_FIXED = GST_OBJECT_FLAG_LAST,
GST_PAD_TEMPLATE_FLAG_LAST = GST_OBJECT_FLAG_LAST + 4
} GstPadTemplateFlags;
#define GST_PAD_TEMPLATE_IS_FIXED(templ) (GST_FLAG_IS_SET(templ, GST_PAD_TEMPLATE_FIXED))
struct _GstPadTemplate {
GstObject object;
gchar *name_template;
GstPadDirection direction;
GstPadPresence presence;
GstCaps *caps;
gpointer _gst_reserved[GST_PADDING];
};
struct _GstPadTemplateClass {
GstObjectClass parent_class;
/* signal callbacks */
void (*pad_created) (GstPadTemplate *templ, GstPad *pad);
gpointer _gst_reserved[GST_PADDING];
};
struct _GstStaticPadTemplate {
gchar *name_template;
GstPadDirection direction;
GstPadPresence presence;
GstStaticCaps static_caps;
};
#define GST_STATIC_PAD_TEMPLATE(padname, dir, pres, caps) \
{ \
/* name_template */ padname, \
/* direction */ dir, \
/* presence */ pres, \
/* caps */ caps \
}
GType gst_pad_get_type (void); GType gst_pad_get_type (void);
@ -482,19 +535,6 @@ gboolean gst_pad_dispatcher (GstPad *pad, GstPadDispatcherFunction dispatch,
void gst_pad_load_and_link (xmlNodePtr self, GstObject *parent); void gst_pad_load_and_link (xmlNodePtr self, GstObject *parent);
#endif #endif
/* templates and factories */
GType gst_pad_template_get_type (void);
GstPadTemplate* gst_pad_template_new (const gchar *name_template,
GstPadDirection direction, GstPadPresence presence,
GstCaps *caps);
GstPadTemplate * gst_static_pad_template_get (GstStaticPadTemplate *pad_template);
GstCaps* gst_static_pad_template_get_caps (GstStaticPadTemplate *templ);
GstCaps* gst_pad_template_get_caps (GstPadTemplate *templ);
G_END_DECLS G_END_DECLS
#endif /* __GST_PAD_H__ */ #endif /* __GST_PAD_H__ */

331
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@ -0,0 +1,331 @@
/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstpadtemplate.c: Templates for pad creation
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:gstpadtemplate
* @short_description: Describe the media type of a pad.
* @see_also: #GstPad, #GstElementFactory
*
* Padtemplates describe the possible media types a pad or an elementfactory can
* handle.
*
* Pad and PadTemplates have #GstCaps attached to it to describe the media type they
* are capable of dealing with. gst_pad_template_get_caps() is used to get the
* caps of a padtemplate. It's not possible to modify the caps of a padtemplate after
* creation.
*
* Padtemplates can be created with gst_pad_template_new() or with the convenient
* GST_PAD_TEMPLATE_FACTORY() macro. A padtemplate can be used to create a pad or
* to add to an elementfactory.
*
* The following code example shows the code to create a pad from a padtemplate.
* <example>
* <title>Create a pad from a padtemplate</title>
* <programlisting>
* GstStaticPadTemplate my_template =
* GST_STATIC_PAD_TEMPLATE (
* "sink", // the name of the pad
* GST_PAD_SINK, // the direction of the pad
* GST_PAD_ALWAYS, // when this pad will be present
* GST_STATIC_CAPS ( // the capabilities of the padtemplate
* "audio/x-raw-int, "
* "channels = (int) [ 1, 6 ]"
* )
* )
*
* void
* my_method (void)
* {
* GstPad *pad;
*
* pad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (my_template_factory), "sink");
* ...
* }
* </programlisting>
* </example>
*
* The following example shows you how to add the padtemplate to an elementfactory:
* <informalexample>
* <programlisting>
* gboolean
* my_factory_init (GstPlugin *plugin)
* {
* GstElementFactory *factory;
*
* factory = gst_element_factory_new ("my_factory", GST_TYPE_MYFACTORY, &amp;gst_myfactory_details);
* g_return_val_if_fail (factory != NULL, FALSE);
*
* gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (my_template_factory));
*
* gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
*
* return TRUE;
* }
* </programlisting>
* </informalexample>
*/
#include "gst_private.h"
#include "gstpad.h"
#include "gstpadtemplate.h"
#include "gstenumtypes.h"
#include "gstmarshal.h"
#include "gstutils.h"
#include "gstinfo.h"
#include "gsterror.h"
#include "gstvalue.h"
#define GST_CAT_DEFAULT GST_CAT_PADS
enum
{
TEMPL_PAD_CREATED,
/* FILL ME */
LAST_SIGNAL
};
static GstObject *parent_class = NULL;
static guint gst_pad_template_signals[LAST_SIGNAL] = { 0 };
static void gst_pad_template_class_init (GstPadTemplateClass * klass);
static void gst_pad_template_init (GstPadTemplate * templ);
static void gst_pad_template_dispose (GObject * object);
GType
gst_pad_template_get_type (void)
{
static GType padtemplate_type = 0;
if (!padtemplate_type) {
static const GTypeInfo padtemplate_info = {
sizeof (GstPadTemplateClass), NULL, NULL,
(GClassInitFunc) gst_pad_template_class_init, NULL, NULL,
sizeof (GstPadTemplate),
0,
(GInstanceInitFunc) gst_pad_template_init, NULL
};
padtemplate_type =
g_type_register_static (GST_TYPE_OBJECT, "GstPadTemplate",
&padtemplate_info, 0);
}
return padtemplate_type;
}
static void
gst_pad_template_class_init (GstPadTemplateClass * klass)
{
GObjectClass *gobject_class;
GstObjectClass *gstobject_class;
gobject_class = (GObjectClass *) klass;
gstobject_class = (GstObjectClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_OBJECT);
/**
* GstPadTemplate::pad-created:
* @pad_template: the object which received the signal.
* @pad: the pad that was created.
*
* This signal is fired when an element creates a pad from this template.
*/
gst_pad_template_signals[TEMPL_PAD_CREATED] =
g_signal_new ("pad-created", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstPadTemplateClass, pad_created),
NULL, NULL, gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD);
gobject_class->dispose = gst_pad_template_dispose;
gstobject_class->path_string_separator = "*";
}
static void
gst_pad_template_init (GstPadTemplate * templ)
{
}
static void
gst_pad_template_dispose (GObject * object)
{
GstPadTemplate *templ = GST_PAD_TEMPLATE (object);
g_free (GST_PAD_TEMPLATE_NAME_TEMPLATE (templ));
if (GST_PAD_TEMPLATE_CAPS (templ)) {
gst_caps_unref (GST_PAD_TEMPLATE_CAPS (templ));
}
G_OBJECT_CLASS (parent_class)->dispose (object);
}
/* ALWAYS padtemplates cannot have conversion specifications (like src_%d),
* since it doesn't make sense.
* SOMETIMES padtemplates can do whatever they want, they are provided by the
* element.
* REQUEST padtemplates can be reverse-parsed (the user asks for 'sink1', the
* 'sink%d' template is automatically selected), so we need to restrict their
* naming.
*/
static gboolean
name_is_valid (const gchar * name, GstPadPresence presence)
{
const gchar *str;
if (presence == GST_PAD_ALWAYS) {
if (strchr (name, '%')) {
g_warning ("invalid name template %s: conversion specifications are not"
" allowed for GST_PAD_ALWAYS padtemplates", name);
return FALSE;
}
} else if (presence == GST_PAD_REQUEST) {
if ((str = strchr (name, '%')) && strchr (str + 1, '%')) {
g_warning ("invalid name template %s: only one conversion specification"
" allowed in GST_PAD_REQUEST padtemplate", name);
return FALSE;
}
if (str && (*(str + 1) != 's' && *(str + 1) != 'd')) {
g_warning ("invalid name template %s: conversion specification must be of"
" type '%%d' or '%%s' for GST_PAD_REQUEST padtemplate", name);
return FALSE;
}
if (str && (*(str + 2) != '\0')) {
g_warning ("invalid name template %s: conversion specification must"
" appear at the end of the GST_PAD_REQUEST padtemplate name", name);
return FALSE;
}
}
return TRUE;
}
/**
* gst_static_pad_template_get:
* @pad_template: the static pad template
*
* Converts a #GstStaticPadTemplate into a #GstPadTemplate.
*
* Returns: a new #GstPadTemplate.
*/
GstPadTemplate *
gst_static_pad_template_get (GstStaticPadTemplate * pad_template)
{
GstPadTemplate *new;
if (!name_is_valid (pad_template->name_template, pad_template->presence))
return NULL;
new = g_object_new (gst_pad_template_get_type (),
"name", pad_template->name_template, NULL);
GST_PAD_TEMPLATE_NAME_TEMPLATE (new) = g_strdup (pad_template->name_template);
GST_PAD_TEMPLATE_DIRECTION (new) = pad_template->direction;
GST_PAD_TEMPLATE_PRESENCE (new) = pad_template->presence;
GST_PAD_TEMPLATE_CAPS (new) =
gst_caps_copy (gst_static_caps_get (&pad_template->static_caps));
return new;
}
/**
* gst_pad_template_new:
* @name_template: the name template.
* @direction: the #GstPadDirection of the template.
* @presence: the #GstPadPresence of the pad.
* @caps: a #GstCaps set for the template. The caps are taken ownership of.
*
* Creates a new pad template with a name according to the given template
* and with the given arguments. This functions takes ownership of the provided
* caps, so be sure to not use them afterwards.
*
* Returns: a new #GstPadTemplate.
*/
GstPadTemplate *
gst_pad_template_new (const gchar * name_template,
GstPadDirection direction, GstPadPresence presence, GstCaps * caps)
{
GstPadTemplate *new;
g_return_val_if_fail (name_template != NULL, NULL);
g_return_val_if_fail (caps != NULL, NULL);
g_return_val_if_fail (direction == GST_PAD_SRC
|| direction == GST_PAD_SINK, NULL);
g_return_val_if_fail (presence == GST_PAD_ALWAYS
|| presence == GST_PAD_SOMETIMES || presence == GST_PAD_REQUEST, NULL);
if (!name_is_valid (name_template, presence)) {
gst_caps_unref (caps);
return NULL;
}
new = g_object_new (gst_pad_template_get_type (),
"name", name_template, NULL);
GST_PAD_TEMPLATE_NAME_TEMPLATE (new) = g_strdup (name_template);
GST_PAD_TEMPLATE_DIRECTION (new) = direction;
GST_PAD_TEMPLATE_PRESENCE (new) = presence;
GST_PAD_TEMPLATE_CAPS (new) = caps;
return new;
}
/**
* gst_static_pad_template_get_caps:
* @templ: a #GstStaticPadTemplate to get capabilities of.
*
* Gets the capabilities of the static pad template.
*
* Returns: the #GstCaps of the static pad template. If you need to keep a
* reference to the caps, take a ref (see gst_caps_ref ()).
*/
GstCaps *
gst_static_pad_template_get_caps (GstStaticPadTemplate * templ)
{
g_return_val_if_fail (templ, NULL);
return (GstCaps *) gst_static_caps_get (&templ->static_caps);
}
/**
* gst_pad_template_get_caps:
* @templ: a #GstPadTemplate to get capabilities of.
*
* Gets the capabilities of the pad template.
*
* Returns: the #GstCaps of the pad template. If you need to keep a reference to
* the caps, take a ref (see gst_caps_ref ()).
*/
GstCaps *
gst_pad_template_get_caps (GstPadTemplate * templ)
{
g_return_val_if_fail (GST_IS_PAD_TEMPLATE (templ), NULL);
return GST_PAD_TEMPLATE_CAPS (templ);
}
void
gst_pad_template_pad_created (GstPadTemplate * templ, GstPad * pad)
{
gst_object_sink (GST_OBJECT (templ));
g_signal_emit (G_OBJECT (templ),
gst_pad_template_signals[TEMPL_PAD_CREATED], 0, pad);
}

174
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@ -0,0 +1,174 @@
/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wim.taymans@chello.be>
*
* gstpadtemplate.h: Header for GstPadTemplate object
*
* 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.
*/
#ifndef __GST_PAD_TEMPLATE_H__
#define __GST_PAD_TEMPLATE_H__
#include <gst/gstconfig.h>
#include <gst/gstobject.h>
#include <gst/gstbuffer.h>
#include <gst/gstcaps.h>
#include <gst/gstevent.h>
#include <gst/gstquery.h>
#include <gst/gstqueryutils.h>
#include <gst/gsttask.h>
G_BEGIN_DECLS
/* FIXME: this awful circular dependency need to be resolved properly (see pad.h) */
//typedef struct _GstPadTemplate GstPadTemplate;
typedef struct _GstPadTemplateClass GstPadTemplateClass;
typedef struct _GstStaticPadTemplate GstStaticPadTemplate;
#define GST_TYPE_PAD_TEMPLATE (gst_pad_template_get_type ())
#define GST_PAD_TEMPLATE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PAD_TEMPLATE,GstPadTemplate))
#define GST_PAD_TEMPLATE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PAD_TEMPLATE,GstPadTemplateClass))
#define GST_IS_PAD_TEMPLATE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PAD_TEMPLATE))
#define GST_IS_PAD_TEMPLATE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_PAD_TEMPLATE))
/**
* GstPadPresence:
* @GST_PAD_ALWAYS: the pad is always available
* @GST_PAD_SOMETIMES: the pad will become available depending on the media stream
* @GST_PAD_REQUEST: the pad is only available on request with
* gst_element_request_pad_by_name() or gst_element_request_compatible_pad().
*
* Indicates when this pad will become available.
*/
typedef enum {
GST_PAD_ALWAYS,
GST_PAD_SOMETIMES,
GST_PAD_REQUEST
} GstPadPresence;
/**
* GST_PAD_TEMPLATE_NAME_TEMPLATE:
* @templ: the template to query
*
* Get the nametemplate of the padtemplate.
*/
#define GST_PAD_TEMPLATE_NAME_TEMPLATE(templ) (((GstPadTemplate *)(templ))->name_template)
/**
* GST_PAD_TEMPLATE_DIRECTION:
* @templ: the template to query
*
* Get the direction of the padtemplate.
*/
#define GST_PAD_TEMPLATE_DIRECTION(templ) (((GstPadTemplate *)(templ))->direction)
/**
* GST_PAD_TEMPLATE_PRESENCE:
* @templ: the template to query
*
* Get the presence of the padtemplate.
*/
#define GST_PAD_TEMPLATE_PRESENCE(templ) (((GstPadTemplate *)(templ))->presence)
/**
* GST_PAD_TEMPLATE_CAPS:
* @templ: the template to query
*
* Get a handle to the padtemplate #GstCaps
*/
#define GST_PAD_TEMPLATE_CAPS(templ) (((GstPadTemplate *)(templ))->caps)
/**
* GstPadTemplateFlags:
* @GST_PAD_TEMPLATE_FIXED: the padtemplate has no variable properties
* @GST_PAD_TEMPLATE_FLAG_LAST: first flag that can be used by subclasses.
*
* Flags for the padtemplate
*/
typedef enum {
GST_PAD_TEMPLATE_FIXED = GST_OBJECT_FLAG_LAST,
GST_PAD_TEMPLATE_FLAG_LAST = GST_OBJECT_FLAG_LAST + 4
} GstPadTemplateFlags;
/**
* GST_PAD_TEMPLATE_IS_FIXED:
* @templ: the template to query
*
* Check if the properties of the padtemplate are fixed
*/
#define GST_PAD_TEMPLATE_IS_FIXED(templ) (GST_FLAG_IS_SET(templ, GST_PAD_TEMPLATE_FIXED))
/**
* GstPadTemplate:
*
* The padtemplate object.
*/
struct _GstPadTemplate {
GstObject object;
gchar *name_template;
GstPadDirection direction;
GstPadPresence presence;
GstCaps *caps;
gpointer _gst_reserved[GST_PADDING];
};
struct _GstPadTemplateClass {
GstObjectClass parent_class;
/* signal callbacks */
void (*pad_created) (GstPadTemplate *templ, GstPad *pad);
gpointer _gst_reserved[GST_PADDING];
};
struct _GstStaticPadTemplate {
gchar *name_template;
GstPadDirection direction;
GstPadPresence presence;
GstStaticCaps static_caps;
};
#define GST_STATIC_PAD_TEMPLATE(padname, dir, pres, caps) \
{ \
/* name_template */ padname, \
/* direction */ dir, \
/* presence */ pres, \
/* caps */ caps \
}
/* templates and factories */
GType gst_pad_template_get_type (void);
GstPadTemplate* gst_pad_template_new (const gchar *name_template,
GstPadDirection direction, GstPadPresence presence,
GstCaps *caps);
GstPadTemplate * gst_static_pad_template_get (GstStaticPadTemplate *pad_template);
GstCaps* gst_static_pad_template_get_caps (GstStaticPadTemplate *templ);
GstCaps* gst_pad_template_get_caps (GstPadTemplate *templ);
void gst_pad_template_pad_created (GstPadTemplate * templ, GstPad * pad);
G_END_DECLS
#endif /* __GST_PAD_TEMPLATE_H__ */