gstreamer/gst/gstpad.c
Erik Walthinsen ca1c48e95c Updated copyright in all the libgst files.
Original commit message from CVS:
Updated copyright in all the libgst files.
Created gst_private.h, set up all files to use it.
2000-12-28 22:12:02 +00:00

944 lines
22 KiB
C

/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstpad.c: Pads for connecting elements together
*
* 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.
*/
//#define GST_DEBUG_ENABLED
#include "gst_private.h"
#include "gstpad.h"
#include "gstelement.h"
#include "gsttype.h"
/* Pad signals and args */
enum {
SET_ACTIVE,
CAPS_CHANGED,
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_ACTIVE,
/* FILL ME */
};
static void gst_pad_class_init (GstPadClass *klass);
static void gst_pad_init (GstPad *pad);
static void gst_pad_set_arg (GtkObject *object,GtkArg *arg,guint id);
static void gst_pad_get_arg (GtkObject *object,GtkArg *arg,guint id);
static void gst_pad_real_destroy (GtkObject *object);
static void gst_pad_push_func (GstPad *pad, GstBuffer *buf);
static GstObject *pad_parent_class = NULL;
static guint gst_pad_signals[LAST_SIGNAL] = { 0 };
GtkType
gst_pad_get_type(void) {
static GtkType pad_type = 0;
if (!pad_type) {
static const GtkTypeInfo pad_info = {
"GstPad",
sizeof(GstPad),
sizeof(GstPadClass),
(GtkClassInitFunc)gst_pad_class_init,
(GtkObjectInitFunc)gst_pad_init,
(GtkArgSetFunc)NULL,
(GtkArgGetFunc)NULL,
(GtkClassInitFunc)NULL,
};
pad_type = gtk_type_unique(GST_TYPE_OBJECT,&pad_info);
}
return pad_type;
}
static void
gst_pad_class_init (GstPadClass *klass)
{
GtkObjectClass *gtkobject_class;
gtkobject_class = (GtkObjectClass*)klass;
pad_parent_class = gtk_type_class(GST_TYPE_OBJECT);
gst_pad_signals[SET_ACTIVE] =
gtk_signal_new ("set_active", GTK_RUN_LAST, gtkobject_class->type,
GTK_SIGNAL_OFFSET (GstPadClass, set_active),
gtk_marshal_NONE__BOOL, GTK_TYPE_NONE, 1,
GTK_TYPE_BOOL);
gst_pad_signals[CAPS_CHANGED] =
gtk_signal_new ("caps_changed", GTK_RUN_LAST, gtkobject_class->type,
GTK_SIGNAL_OFFSET (GstPadClass, caps_changed),
gtk_marshal_NONE__POINTER, GTK_TYPE_NONE, 1,
GTK_TYPE_POINTER);
gtk_object_add_arg_type ("GstPad::active", GTK_TYPE_BOOL,
GTK_ARG_READWRITE, ARG_ACTIVE);
gtkobject_class->destroy = gst_pad_real_destroy;
gtkobject_class->set_arg = gst_pad_set_arg;
gtkobject_class->get_arg = gst_pad_get_arg;
}
static void
gst_pad_init (GstPad *pad)
{
pad->direction = GST_PAD_UNKNOWN;
pad->peer = NULL;
pad->chainfunc = NULL;
pad->getfunc = NULL;
pad->getregionfunc = NULL;
pad->qosfunc = NULL;
pad->pushfunc = NULL; //GST_DEBUG_FUNCPTR(gst_pad_push_func);
pad->pullfunc = NULL;
pad->pullregionfunc = NULL;
pad->parent = NULL;
pad->ghostparents = NULL;
pad->caps = NULL;
pad->padtemplate = NULL;
}
static void
gst_pad_set_arg (GtkObject *object,GtkArg *arg,guint id) {
g_return_if_fail(GST_IS_PAD(object));
switch (id) {
case ARG_ACTIVE:
if (GTK_VALUE_BOOL(*arg)) {
gst_info("gstpad: activating pad\n");
GST_FLAG_UNSET(object,GST_PAD_DISABLED);
} else {
gst_info("gstpad: de-activating pad\n");
GST_FLAG_SET(object,GST_PAD_DISABLED);
}
gtk_signal_emit(GTK_OBJECT(object), gst_pad_signals[SET_ACTIVE],
! GST_FLAG_IS_SET(object,GST_PAD_DISABLED));
break;
default:
break;
}
}
static void
gst_pad_get_arg (GtkObject *object,
GtkArg *arg,
guint id)
{
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_PAD (object));
switch (id) {
case ARG_ACTIVE:
GTK_VALUE_BOOL (*arg) = ! GST_FLAG_IS_SET (object, GST_PAD_DISABLED);
break;
default:
break;
}
}
/**
* gst_pad_new:
* @name: name of new pad
* @direction: either GST_PAD_SRC or GST_PAD_SINK
*
* Create a new pad with given name.
*
* Returns: new pad
*/
GstPad*
gst_pad_new (gchar *name,
GstPadDirection direction)
{
GstPad *pad;
g_return_val_if_fail (name != NULL, NULL);
g_return_val_if_fail (direction != GST_PAD_UNKNOWN, NULL);
pad = GST_PAD (gtk_type_new (gst_pad_get_type ()));
pad->name = g_strdup (name);
pad->direction = direction;
return pad;
}
/**
* gst_pad_new_from_template:
* @temp: the pad template to use
* @name: the name of the element
*
* Create a new pad with given name from the given template.
*
* Returns: new pad
*/
GstPad*
gst_pad_new_from_template (GstPadTemplate *temp,
gchar *name)
{
GstPad *pad;
g_return_val_if_fail (name != NULL, NULL);
g_return_val_if_fail (temp != NULL, NULL);
pad = gst_pad_new (name, temp->direction);
pad->caps = temp->caps;
pad->padtemplate = temp;
return pad;
}
/**
* gst_pad_get_direction:
* @pad: the Pad to get the direction from
*
* get the direction of the pad
*
* Returns: the direction of the pad
*/
GstPadDirection
gst_pad_get_direction (GstPad *pad)
{
g_return_val_if_fail (pad != NULL, GST_PAD_UNKNOWN);
g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_UNKNOWN);
return pad->direction;
}
/**
* gst_pad_set_name:
* @pad: the pad to set the name of
* @name: the name of the pad
*
* set the name of a pad
*/
void
gst_pad_set_name (GstPad *pad,
const gchar *name)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
if (pad->name != NULL)
g_free (pad->name);
pad->name = g_strdup (name);
}
/**
* gst_pad_get_name:
* @pad: the pad to get the name of
*
* get the name of a pad
*
* Returns: the name of the pad, don't free.
*/
const gchar*
gst_pad_get_name (GstPad *pad)
{
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
return pad->name;
}
/**
* gst_pad_set_chain_function:
* @pad: the pad to set the chain function for
* @chain: the chain function
*
* Set the given chain function for the pad
*/
void gst_pad_set_chain_function (GstPad *pad,
GstPadChainFunction chain)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
pad->chainfunc = chain;
}
/**
* gst_pad_set_get_function:
* @pad: the pad to set the get function for
* @get: the get function
*
* Set the given get function for the pad
*/
void
gst_pad_set_get_function (GstPad *pad,
GstPadGetFunction get)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
// the if and such should optimize out when DEBUG is off
DEBUG("setting get function for %s:%s\n",GST_DEBUG_PAD_NAME(pad));
pad->getfunc = get;
DEBUG("getfunc for %s:%s(@%p) at %p is set to %p\n",GST_DEBUG_PAD_NAME(pad),pad,&pad->getfunc,get);
}
/**
* gst_pad_set_getregion_function:
* @pad: the pad to set the getregion function for
* @getregion: the getregion function
*
* Set the given getregion function for the pad
*/
void
gst_pad_set_getregion_function (GstPad *pad,
GstPadGetRegionFunction getregion)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
DEBUG("gstpad: pad setting getregion function\n");
pad->getregionfunc = getregion;
}
/**
* gst_pad_set_qos_function:
* @pad: the pad to set the qos function for
* @qos: the qos function
*
* Set the given qos function for the pad
*/
void
gst_pad_set_qos_function (GstPad *pad,
GstPadQoSFunction qos)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
pad->qosfunc = qos;
}
static void
gst_pad_push_func(GstPad *pad, GstBuffer *buf)
{
if (pad->peer->chainfunc != NULL) {
DEBUG("calling chain function\n");
(pad->peer->chainfunc)(pad,buf);
} else {
DEBUG("got a problem here: default pad_push handler in place, no chain function\n");
}
}
/**
* gst_pad_chain:
* @pad: the pad to chain
*
* call the chain function of the given pad
*/
void
gst_pad_chain (GstPad *pad)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (pad->peer != NULL);
g_return_if_fail (pad->chainfunc != NULL);
if (pad->bufpen && pad->chainfunc)
(pad->chainfunc) (pad,pad->bufpen);
}
/**
* gst_pad_handle_qos:
* @pad: the pad to handle the QoS message
* @qos_message: the QoS message to handle
*
* pass the qos message downstream
*/
void
gst_pad_handle_qos(GstPad *pad,
glong qos_message)
{
GstElement *element;
GList *pads;
GstPad *target_pad;
DEBUG("gst_pad_handle_qos(\"%s\",%08ld)\n", GST_ELEMENT(pad->parent)->name,qos_message);
if (pad->qosfunc) {
(pad->qosfunc) (pad,qos_message);
}
else {
element = GST_ELEMENT (pad->peer->parent);
pads = element->pads;
DEBUG("gst_pad_handle_qos recurse(\"%s\",%08ld)\n", element->name,qos_message);
while (pads) {
target_pad = GST_PAD (pads->data);
if (target_pad->direction == GST_PAD_SINK) {
gst_pad_handle_qos (target_pad, qos_message);
}
pads = g_list_next (pads);
}
}
return;
}
/**
* gst_pad_disconnect:
* @srcpad: the source pad to disconnect
* @sinkpad: the sink pad to disconnect
*
* disconnects the source pad from the sink pad
*/
void
gst_pad_disconnect (GstPad *srcpad,
GstPad *sinkpad)
{
/* generic checks */
g_return_if_fail (srcpad != NULL);
g_return_if_fail (GST_IS_PAD (srcpad));
g_return_if_fail (srcpad->peer != NULL);
g_return_if_fail (sinkpad != NULL);
g_return_if_fail (GST_IS_PAD (sinkpad));
g_return_if_fail (sinkpad->peer != NULL);
g_return_if_fail ((srcpad->direction == GST_PAD_SRC) &&
(sinkpad->direction == GST_PAD_SINK));
/* first clear peers */
srcpad->peer = NULL;
sinkpad->peer = NULL;
}
/**
* gst_pad_connect:
* @srcpad: the source pad to connect
* @sinkpad: the sink pad to connect
*
* connects the source pad to the sink pad
*/
void
gst_pad_connect (GstPad *srcpad,
GstPad *sinkpad)
{
GstPad *temppad;
/* generic checks */
g_return_if_fail(srcpad != NULL);
g_return_if_fail(GST_IS_PAD(srcpad));
g_return_if_fail(srcpad->peer == NULL);
g_return_if_fail(sinkpad != NULL);
g_return_if_fail(GST_IS_PAD(sinkpad));
g_return_if_fail(sinkpad->peer == NULL);
// g_return_if_fail(sinkpad->chain != NULL);
/* check for reversed directions and swap if necessary */
if ((srcpad->direction == GST_PAD_SINK) &&
(sinkpad->direction == GST_PAD_SRC)) {
temppad = srcpad;
srcpad = sinkpad;
sinkpad = temppad;
}
g_return_if_fail((srcpad->direction == GST_PAD_SRC) &&
(sinkpad->direction == GST_PAD_SINK));
/* chack pad compatibility */
if (srcpad->caps && sinkpad->caps) {
if (!gst_caps_check_compatibility (srcpad->caps, sinkpad->caps))
g_warning ("gstpad: connecting incompatible pads (%s:%s) and (%s:%s)\n",
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
else
DEBUG ("gstpad: connecting compatible pads (%s:%s) and (%s:%s)\n",
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
}
else
DEBUG ("gstpad: could not check capabilities of pads (%s:%s) and (%s:%s)\n",
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
/* first set peers */
srcpad->peer = sinkpad;
sinkpad->peer = srcpad;
/* now copy the chain pointer from sink to src */
srcpad->chainfunc = sinkpad->chainfunc;
/* and the pull function */
//srcpad->pullfunc = sinkpad->pullfunc;
/* set the connected flag */
/* FIXME: set connected flag */
}
/**
* gst_pad_set_parent:
* @pad: the pad to set the parent
* @parent: the object to set the parent to
*
* sets the parent object of a pad.
*/
void
gst_pad_set_parent (GstPad *pad,
GstObject *parent)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (pad->parent == NULL);
g_return_if_fail (parent != NULL);
g_return_if_fail (GTK_IS_OBJECT (parent));
g_return_if_fail ((gpointer)pad != (gpointer)parent);
//g_print("set parent %s\n", gst_element_get_name(parent));
pad->parent = parent;
}
/**
* gst_pad_add_ghost_parent:
* @pad: the pad to set the ghost parent
* @parent: the object to set the ghost parent to
*
* add a ghost parent object to a pad.
*/
void
gst_pad_add_ghost_parent (GstPad *pad,
GstObject *parent)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (parent != NULL);
g_return_if_fail (GTK_IS_OBJECT (parent));
pad->ghostparents = g_list_prepend (pad->ghostparents, parent);
}
/**
* gst_pad_remove_ghost_parent:
* @pad: the pad to remove the ghost parent
* @parent: the object to remove the ghost parent from
*
* remove a ghost parent object from a pad.
*/
void
gst_pad_remove_ghost_parent (GstPad *pad,
GstObject *parent)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (parent != NULL);
g_return_if_fail (GTK_IS_OBJECT (parent));
pad->ghostparents = g_list_remove (pad->ghostparents, parent);
}
/**
* gst_pad_get_parent:
* @pad: the pad to get the parent from
*
* get the parent object of this pad
*
* Returns: the parent object
*/
GstObject*
gst_pad_get_parent (GstPad *pad)
{
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
return pad->parent;
}
/**
* gst_pad_get_ghost_parents:
* @pad: the pad to get the ghost parents from
*
* get the ghost parents of this pad
*
* Returns: a list of ghost parent objects
*/
GList*
gst_pad_get_ghost_parents (GstPad *pad)
{
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
return pad->ghostparents;
}
/**
* gst_pad_set_caps:
* @pad: the pad to set the caps to
* @caps: the caps to attach to this pad
*
* set the capabilities of this pad
*/
void
gst_pad_set_caps (GstPad *pad,
GstCaps *caps)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
pad->caps = caps;
}
/**
* gst_pad_get_caps:
* @pad: the pad to get the capabilities from
*
* get the capabilities of this pad
*
* Returns: the capabilities of this pad
*/
GstCaps *
gst_pad_get_caps (GstPad *pad)
{
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
return pad->caps;
}
/**
* gst_pad_get_peer:
* @pad: the pad to get the peer from
*
* Get the peer pad of this pad
*
* Returns: the peer pad
*/
GstPad*
gst_pad_get_peer (GstPad *pad)
{
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
return pad->peer;
}
static void
gst_pad_real_destroy (GtkObject *object)
{
GstPad *pad = GST_PAD (object);
// g_print("in gst_pad_real_destroy()\n");
if (pad->name)
g_free (pad->name);
g_list_free (pad->ghostparents);
}
/**
* gst_pad_load_and_connect:
* @parent: the parent XML node to read the description from
* @element: the element that has the source pad
* @elements: a hashtable with elements
*
* Read the pad definition from the XML node and connect the given pad
* in element to a pad of an element in the hashtable.
*/
void
gst_pad_load_and_connect (xmlNodePtr parent,
GstObject *element,
GHashTable *elements)
{
xmlNodePtr field = parent->childs;
GstPad *pad = NULL, *targetpad;
guchar *peer = NULL;
gchar **split;
GstElement *target;
while (field) {
if (!strcmp(field->name, "name")) {
pad = gst_element_get_pad(GST_ELEMENT(element), xmlNodeGetContent(field));
}
else if (!strcmp(field->name, "peer")) {
peer = g_strdup(xmlNodeGetContent(field));
}
field = field->next;
}
g_return_if_fail(pad != NULL);
if (peer == NULL) return;
split = g_strsplit(peer, ".", 2);
g_return_if_fail(split[0] != NULL);
g_return_if_fail(split[1] != NULL);
target = (GstElement *)g_hash_table_lookup(elements, split[0]);
if (target == NULL) goto cleanup;
targetpad = gst_element_get_pad(target, split[1]);
if (targetpad == NULL) goto cleanup;
gst_pad_connect(pad, targetpad);
cleanup:
g_strfreev(split);
}
/**
* gst_pad_save_thyself:
* @pad: the pad to save
* @parent: the parent XML node to save the description in
*
* Saves the pad into an xml representation
*
* Returns: the xml representation of the pad
*/
xmlNodePtr
gst_pad_save_thyself (GstPad *pad,
xmlNodePtr parent)
{
GstPad *peer;
xmlNewChild(parent,NULL,"name",pad->name);
if (pad->peer != NULL) {
peer = pad->peer;
// first check to see if the peer's parent's parent is the same
//if (pad->parent->parent == peer->parent->parent)
// we just save it off
xmlNewChild(parent,NULL,"peer",g_strdup_printf("%s.%s",
GST_ELEMENT(peer->parent)->name,peer->name));
} else
xmlNewChild(parent,NULL,"peer","");
return parent;
}
/**
* gst_pad_ghost_save_thyself:
* @pad: the pad to save
* @bin: the bin
* @parent: the parent XML node to save the description in
*
* Saves the ghost pad into an xml representation
*
* Returns: the xml representation of the pad
*/
xmlNodePtr
gst_pad_ghost_save_thyself (GstPad *pad,
GstElement *bin,
xmlNodePtr parent)
{
xmlNodePtr self;
self = xmlNewChild(parent,NULL,"ghostpad",NULL);
xmlNewChild(self,NULL,"name",pad->name);
xmlNewChild(self,NULL,"parent",GST_ELEMENT(pad->parent)->name);
return self;
}
#ifndef gst_pad_push
void gst_pad_push(GstPad *pad,GstBuffer *buf) {
DEBUG_ENTER("(%s:%s)",GST_DEBUG_PAD_NAME(pad));
if (pad->peer->pushfunc) {
DEBUG("calling pushfunc &%s of peer pad %s:%s\n",
GST_DEBUG_FUNCPTR_NAME(pad->peer->pushfunc),GST_DEBUG_PAD_NAME(pad->peer));
(pad->peer->pushfunc)(pad->peer,buf);
} else
DEBUG("no pushfunc\n");
}
#endif
#ifndef gst_pad_pull
GstBuffer *gst_pad_pull(GstPad *pad) {
GstPad *peer = pad->peer;
DEBUG_ENTER("(%s:%s)",GST_DEBUG_PAD_NAME(pad));
if (peer->pullfunc) {
DEBUG("calling pullfunc &%s (@%p) of peer pad %s:%s\n",
GST_DEBUG_FUNCPTR_NAME(peer->pullfunc),&peer->pullfunc,GST_DEBUG_PAD_NAME(peer));
return (peer->pullfunc)(peer);
} else {
DEBUG("no pullfunc for peer pad %s:%s at %p\n",GST_DEBUG_PAD_NAME(peer),&peer->pullfunc);
return NULL;
}
}
#endif
#ifndef gst_pad_pullregion
GstBuffer *gst_pad_pullregion(GstPad *pad,gulong offset,gulong size) {
DEBUG_ENTER("(%s:%s,%ld,%ld)",GST_DEBUG_PAD_NAME(pad),offset,size);
if (pad->peer->pullregionfunc) {
DEBUG("calling pullregionfunc &%s of peer pad %s:%s\n",
GST_DEBUG_FUNCPTR_NAME(pad->peer->pullregionfunc),GST_DEBUG_PAD_NAME(pad->peer));
return (pad->peer->pullregionfunc)(pad->peer,offset,size);
} else {
DEBUG("no pullregionfunc\n");
return NULL;
}
}
#endif
/************************************************************************
*
* templates
*
*/
/**
* gst_padtemplate_new:
* @factory: the padfactory to use
*
* creates a new padtemplate from the factory
*
* Returns: the new padtemplate
*/
GstPadTemplate*
gst_padtemplate_new (GstPadFactory *factory)
{
GstPadTemplate *new;
GstPadFactoryEntry tag;
gint i = 0;
g_return_val_if_fail (factory != NULL, NULL);
new = g_new0 (GstPadTemplate, 1);
tag = (*factory)[i++];
g_return_val_if_fail (tag != NULL, new);
new->name_template = g_strdup ((gchar *)tag);
tag = (*factory)[i++];
new->direction = GPOINTER_TO_UINT (tag);
tag = (*factory)[i++];
new->presence = GPOINTER_TO_UINT (tag);
new->caps = gst_caps_register ((GstCapsFactory *)&(*factory)[i]);
return new;
}
/**
* gst_padtemplate_create:
* @name_template: the name template
* @direction: the direction for the template
* @presence: the presence of the pad
* @caps: the capabilities for the template
*
* creates a new padtemplate from the given arguments
*
* Returns: the new padtemplate
*/
GstPadTemplate*
gst_padtemplate_create (gchar *name_template,
GstPadDirection direction, GstPadPresence presence,
GstCaps *caps)
{
GstPadTemplate *new;
new = g_new0 (GstPadTemplate, 1);
new->name_template = name_template;
new->direction = direction;
new->presence = presence;
new->caps = caps;
return new;
}
/**
* gst_padtemplate_save_thyself:
* @pad: the padtemplate to save
* @parent: the parent XML tree
*
* saves the padtemplate into XML
*
* Returns: the new XML tree
*/
xmlNodePtr
gst_padtemplate_save_thyself (GstPadTemplate *pad, xmlNodePtr parent)
{
xmlNodePtr subtree;
xmlNewChild(parent,NULL,"nametemplate", pad->name_template);
xmlNewChild(parent,NULL,"direction", (pad->direction == GST_PAD_SINK? "sink":"src"));
xmlNewChild(parent,NULL,"presence", (pad->presence == GST_PAD_ALWAYS? "always":"sometimes"));
subtree = xmlNewChild(parent,NULL,"caps", NULL);
gst_caps_save_thyself (pad->caps, subtree);
return parent;
}
/**
* gst_padtemplate_load_thyself:
* @parent: the source XML tree
*
* loads a padtemplate from the XML tree
*
* Returns: the new padtemplate
*/
GstPadTemplate*
gst_padtemplate_load_thyself (xmlNodePtr parent)
{
xmlNodePtr field = parent->childs;
GstPadTemplate *factory = g_new0 (GstPadTemplate, 1);
while (field) {
if (!strcmp(field->name, "nametemplate")) {
factory->name_template = g_strdup(xmlNodeGetContent(field));
}
if (!strcmp(field->name, "direction")) {
gchar *value = xmlNodeGetContent(field);
factory->direction = GST_PAD_UNKNOWN;
if (!strcmp(value, "sink")) {
factory->direction = GST_PAD_SINK;
}
else if (!strcmp(value, "src")) {
factory->direction = GST_PAD_SRC;
}
}
if (!strcmp(field->name, "presence")) {
gchar *value = xmlNodeGetContent(field);
if (!strcmp(value, "always")) {
factory->presence = GST_PAD_ALWAYS;
}
else if (!strcmp(value, "sometimes")) {
factory->presence = GST_PAD_SOMETIMES;
}
}
else if (!strcmp(field->name, "caps")) {
factory->caps = gst_caps_load_thyself (field);
}
field = field->next;
}
return factory;
}