gstreamer/gst/gstpad.c

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/* Gnome-Streamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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 DEBUG_ENABLED
#include <gst/gst.h>
#include <gst/gstpad.h>
#include <gst/gstelement.h>
#include <gst/gsttype.h>
/* Pad signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
/* FILL ME */
};
static void gst_pad_class_init(GstPadClass *klass);
static void gst_pad_init(GstPad *pad);
static void gst_pad_real_destroy(GtkObject *object);
static GstObject *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;
parent_class = gtk_type_class(GST_TYPE_OBJECT);
gtkobject_class->destroy = gst_pad_real_destroy;
}
static void gst_pad_init(GstPad *pad) {
pad->type = 0;
pad->direction = GST_PAD_UNKNOWN;
pad->peer = NULL;
pad->chainfunc = NULL;
pad->pullfunc = NULL;
pad->pushfunc = NULL;
pad->qosfunc = NULL;
pad->parent = NULL;
pad->ghostparents = NULL;
}
/**
* 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_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,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
*/
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_pull_function:
* @pad: the pad to set the pull function for
* @pull: the pull function
*
* Set the given pull function for the pad
*/
void gst_pad_set_pull_function(GstPad *pad,GstPadPullFunction pull) {
g_return_if_fail(pad != NULL);
g_return_if_fail(GST_IS_PAD(pad));
g_print("gstpad: pad setting pull function\n");
pad->pullfunc = pull;
}
/**
* 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_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;
}
/**
* gst_pad_push:
* @pad: the pad to push
* @buffer: the buffer to push
*
* pushes a buffer along a src pad
*/
void gst_pad_push(GstPad *pad,GstBuffer *buffer) {
g_return_if_fail(pad != NULL);
g_return_if_fail(GST_IS_PAD(pad));
g_return_if_fail(GST_PAD_CONNECTED(pad));
g_return_if_fail(buffer != NULL);
gst_trace_add_entry(NULL,0,buffer,"push buffer");
// first check to see if there's a push handler
if (pad->pushfunc != NULL) {
//g_print("-- gst_pad_push(): putting buffer in pen and calling push handler\n");
// put the buffer in peer's holding pen
pad->peer->bufpen = buffer;
// now inform the handler that the peer pad has something
(pad->pushfunc)(pad->peer);
// otherwise we assume we're chaining directly
} else if (pad->chainfunc != NULL) {
//g_print("-- gst_pad_push(): calling chain handler\n");
(pad->chainfunc)(pad->peer,buffer);
// else we squawk
} else {
g_print("-- gst_pad_push(): houston, we have a problem, no way of talking to peer\n");
}
}
/**
* gst_pad_pull:
* @pad: the pad to pull
*
* pulls a buffer along a sink pad
*
* Returns: the buffer that was pulled
*/
GstBuffer *gst_pad_pull(GstPad *pad) {
GstBuffer *buf;
// GstElement *peerparent;
// cothread_state *state;
g_return_val_if_fail(pad != NULL, NULL);
g_return_val_if_fail(GST_IS_PAD(pad), NULL);
// g_print("-- gst_pad_pull(): attempting to pull buffer\n");
// g_return_val_if_fail(pad->pullfunc != NULL, NULL);
// if no buffer in pen and there's a pull handler, fire it
if (pad->bufpen == NULL) {
if (pad->pullfunc != NULL) {
// g_print("-- gst_pad_pull(): calling pull handler\n");
(pad->pullfunc)(pad->peer);
} else {
g_print("-- gst_pad_pull(%s:%s): no buffer in pen, and no handler to get one there!!!\n",
GST_ELEMENT(pad->parent)->name, pad->name);
}
}
// if there's a buffer in the holding pen, use it
if (pad->bufpen != NULL) {
// g_print("-- gst_pad_pull(): buffer available, pulling\n");
buf = pad->bufpen;
pad->bufpen = NULL;
return buf;
// else we have a big problem...
} else {
g_print("-- gst_pad_pull(%s:%s): no buffer in pen, and no handler\n",
GST_ELEMENT(pad->parent)->name, pad->peer->name);
return NULL;
}
return NULL;
}
/**
* 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;
srcpad->chainfunc = NULL;
srcpad->pullfunc = 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));
/* 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_get_type_id:
* @pad: the pad to get the type id from
*
* get the type of this pad
*
* Returns: the type of this pad
*/
guint16 gst_pad_get_type_id(GstPad *pad) {
g_return_val_if_fail(pad != NULL, 0);
g_return_val_if_fail(GST_IS_PAD(pad), 0);
return pad->type;
}
/**
* gst_pad_set_type_id:
* @pad: the pad to set the type id to
* @id: the type id to set this pad to
*
* set the type of this pad
*/
void gst_pad_set_type_id(GstPad *pad,guint16 id) {
g_return_if_fail(pad != NULL);
g_return_if_fail(GST_IS_PAD(pad));
g_return_if_fail(gst_type_find_by_id(id) != NULL);
pad->type = id;
}
/**
* 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);
g_return_if_fail(peer != NULL);
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]);
g_return_if_fail(targetpad != NULL);
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;
}