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gstreamer/gst/gstpad.c
Wim Taymans f4c17c3ba1 Added some more docs 
Original commit message from CVS:
Added some more docs
2001-12-09 13:17:54 +00:00

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/* 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 "gstutils.h"
#include "gstelement.h"
#include "gsttype.h"
#include "gstbin.h"
#include "gstscheduler.h"
GType _gst_pad_type = 0;
/***** Start with the base GstPad class *****/
static void gst_pad_class_init (GstPadClass *klass);
static void gst_pad_init (GstPad *pad);
#ifndef GST_DISABLE_LOADSAVE
static xmlNodePtr gst_pad_save_thyself (GstObject *object, xmlNodePtr parent);
#endif
static GstObject *pad_parent_class = NULL;
GType
gst_pad_get_type(void)
{
if (!_gst_pad_type) {
static const GTypeInfo pad_info = {
sizeof(GstPadClass),
NULL,
NULL,
(GClassInitFunc)gst_pad_class_init,
NULL,
NULL,
sizeof(GstPad),
32,
(GInstanceInitFunc)gst_pad_init,
NULL
};
_gst_pad_type = g_type_register_static(GST_TYPE_OBJECT, "GstPad", &pad_info, 0);
}
return _gst_pad_type;
}
static void
gst_pad_class_init (GstPadClass *klass)
{
pad_parent_class = g_type_class_ref(GST_TYPE_OBJECT);
}
static void
gst_pad_init (GstPad *pad)
{
pad->element_private = NULL;
pad->padtemplate = NULL;
}
/***** Then do the Real Pad *****/
/* Pad signals and args */
enum {
REAL_SET_ACTIVE,
REAL_CAPS_CHANGED,
REAL_CAPS_NEGO_FAILED,
REAL_CONNECTED,
REAL_DISCONNECTED,
/* FILL ME */
REAL_LAST_SIGNAL
};
enum {
REAL_ARG_0,
REAL_ARG_ACTIVE,
/* FILL ME */
};
static void gst_real_pad_class_init (GstRealPadClass *klass);
static void gst_real_pad_init (GstRealPad *pad);
static void gst_real_pad_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
static void gst_real_pad_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
static void gst_real_pad_dispose (GObject *object);
static void gst_pad_push_func (GstPad *pad, GstBuffer *buf);
GType _gst_real_pad_type = 0;
static GstPad *real_pad_parent_class = NULL;
static guint gst_real_pad_signals[REAL_LAST_SIGNAL] = { 0 };
GType
gst_real_pad_get_type(void) {
if (!_gst_real_pad_type) {
static const GTypeInfo pad_info = {
sizeof(GstRealPadClass),
NULL,
NULL,
(GClassInitFunc)gst_real_pad_class_init,
NULL,
NULL,
sizeof(GstRealPad),
32,
(GInstanceInitFunc)gst_real_pad_init,
NULL
};
_gst_real_pad_type = g_type_register_static(GST_TYPE_PAD, "GstRealPad", &pad_info, 0);
}
return _gst_real_pad_type;
}
static void
gst_real_pad_class_init (GstRealPadClass *klass)
{
GObjectClass *gobject_class;
GstObjectClass *gstobject_class;
gobject_class = (GObjectClass*)klass;
gstobject_class = (GstObjectClass*)klass;
real_pad_parent_class = g_type_class_ref(GST_TYPE_PAD);
gobject_class->dispose = GST_DEBUG_FUNCPTR(gst_real_pad_dispose);
gobject_class->set_property = GST_DEBUG_FUNCPTR(gst_real_pad_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR(gst_real_pad_get_property);
gst_real_pad_signals[REAL_SET_ACTIVE] =
g_signal_new ("set_active", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstRealPadClass, set_active), NULL, NULL,
gst_marshal_VOID__BOOLEAN, G_TYPE_NONE, 1,
G_TYPE_BOOLEAN);
gst_real_pad_signals[REAL_CAPS_CHANGED] =
g_signal_new ("caps_changed", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstRealPadClass, caps_changed), NULL, NULL,
gst_marshal_VOID__POINTER, G_TYPE_NONE, 1,
G_TYPE_POINTER);
gst_real_pad_signals[REAL_CAPS_NEGO_FAILED] =
g_signal_new ("caps_nego_failed", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstRealPadClass, caps_nego_failed), NULL, NULL,
gst_marshal_VOID__POINTER, G_TYPE_NONE, 1,
G_TYPE_POINTER);
gst_real_pad_signals[REAL_CONNECTED] =
g_signal_new ("connected", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstRealPadClass, connected), NULL, NULL,
gst_marshal_VOID__POINTER, G_TYPE_NONE, 1,
G_TYPE_POINTER);
gst_real_pad_signals[REAL_DISCONNECTED] =
g_signal_new ("disconnected", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstRealPadClass, disconnected), NULL, NULL,
gst_marshal_VOID__POINTER, G_TYPE_NONE, 1,
G_TYPE_POINTER);
// gtk_object_add_arg_type ("GstRealPad::active", G_TYPE_BOOLEAN,
// GTK_ARG_READWRITE, REAL_ARG_ACTIVE);
g_object_class_install_property (G_OBJECT_CLASS(klass), REAL_ARG_ACTIVE,
g_param_spec_boolean("active","Active","Whether the pad is active.",
TRUE,G_PARAM_READWRITE));
#ifndef GST_DISABLE_LOADSAVE
gstobject_class->save_thyself = GST_DEBUG_FUNCPTR(gst_pad_save_thyself);
#endif
gstobject_class->path_string_separator = ".";
}
static void
gst_real_pad_init (GstRealPad *pad)
{
pad->direction = GST_PAD_UNKNOWN;
pad->peer = NULL;
pad->chainfunc = NULL;
pad->getfunc = NULL;
pad->getregionfunc = NULL;
pad->chainhandler = GST_DEBUG_FUNCPTR(gst_pad_push_func);
pad->gethandler = NULL;
pad->pullregionfunc = NULL;
pad->bufferpoolfunc = NULL;
pad->ghostpads = NULL;
pad->caps = NULL;
}
static void
gst_real_pad_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
g_return_if_fail(GST_IS_PAD(object));
switch (prop_id) {
case REAL_ARG_ACTIVE:
if (g_value_get_boolean(value)) {
GST_DEBUG(GST_CAT_PADS,"activating pad %s:%s\n",GST_DEBUG_PAD_NAME(object));
GST_FLAG_UNSET(object,GST_PAD_DISABLED);
} else {
GST_DEBUG(GST_CAT_PADS,"de-activating pad %s:%s\n",GST_DEBUG_PAD_NAME(object));
GST_FLAG_SET(object,GST_PAD_DISABLED);
}
g_signal_emit(G_OBJECT(object), gst_real_pad_signals[REAL_SET_ACTIVE], 0,
! GST_FLAG_IS_SET(object,GST_PAD_DISABLED));
break;
default:
break;
}
}
static void
gst_real_pad_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_PAD (object));
switch (prop_id) {
case REAL_ARG_ACTIVE:
g_value_set_boolean(value, ! 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)
{
GstRealPad *pad;
g_return_val_if_fail (name != NULL, NULL);
g_return_val_if_fail (direction != GST_PAD_UNKNOWN, NULL);
pad = g_object_new (gst_real_pad_get_type (), NULL);
gst_object_set_name (GST_OBJECT (pad), name);
GST_RPAD_DIRECTION(pad) = direction;
return GST_PAD(pad);
}
/**
* gst_pad_new_from_template:
* @templ: 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 *templ,
gchar *name)
{
GstPad *pad;
g_return_val_if_fail (name != NULL, NULL);
g_return_val_if_fail (templ != NULL, NULL);
pad = gst_pad_new (name, templ->direction);
gst_object_ref (GST_OBJECT (templ));
GST_PAD_PADTEMPLATE(pad) = templ;
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 GST_PAD_DIRECTION(pad);
}
/**
* 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));
gst_object_set_name (GST_OBJECT (pad), 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 GST_OBJECT_NAME (pad);
}
/**
* 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_REAL_PAD (pad));
GST_RPAD_CHAINFUNC(pad) = chain;
GST_DEBUG (GST_CAT_PADS,"chainfunc for %s:%s set to %s\n",
GST_DEBUG_PAD_NAME(pad),GST_DEBUG_FUNCPTR_NAME(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_REAL_PAD (pad));
GST_RPAD_GETFUNC(pad) = get;
GST_DEBUG (GST_CAT_PADS,"getfunc for %s:%s set to %s\n",
GST_DEBUG_PAD_NAME(pad),GST_DEBUG_FUNCPTR_NAME(get));
}
/**
* gst_pad_set_event_function:
* @pad: the pad to set the event handler for
* @event: the event handler
*
* Set the given event handler for the pad.
*/
void
gst_pad_set_event_function (GstPad *pad,
GstPadEventFunction event)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_EVENTFUNC(pad) = event;
GST_DEBUG (GST_CAT_PADS,"eventfunc for %s:%s set to %s\n",
GST_DEBUG_PAD_NAME(pad),GST_DEBUG_FUNCPTR_NAME(event));
}
/**
* 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_REAL_PAD (pad));
GST_RPAD_GETREGIONFUNC(pad) = getregion;
GST_DEBUG (GST_CAT_PADS,"getregionfunc for %s:%s set to %s\n",
GST_DEBUG_PAD_NAME(pad),GST_DEBUG_FUNCPTR_NAME(getregion));
}
/**
* gst_pad_set_negotiate_function:
* @pad: the pad to set the negotiate function for
* @nego: the negotiate function
*
* Set the given negotiate function for the pad.
*/
void
gst_pad_set_negotiate_function (GstPad *pad,
GstPadNegotiateFunction nego)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_NEGOTIATEFUNC(pad) = nego;
GST_DEBUG (GST_CAT_PADS,"negotiatefunc for %s:%s set to %s\n",
GST_DEBUG_PAD_NAME(pad),GST_DEBUG_FUNCPTR_NAME(nego));
}
/**
* gst_pad_set_newcaps_function:
* @pad: the pad to set the newcaps function for
* @newcaps: the newcaps function
*
* Set the given newcaps function for the pad.
*/
void
gst_pad_set_newcaps_function (GstPad *pad,
GstPadNewCapsFunction newcaps)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_NEWCAPSFUNC (pad) = newcaps;
GST_DEBUG (GST_CAT_PADS,"newcapsfunc for %s:%s set to %s\n",
GST_DEBUG_PAD_NAME(pad),GST_DEBUG_FUNCPTR_NAME(newcaps));
}
/**
* gst_pad_set_bufferpool_function:
* @pad: the pad to set the bufferpool function for
* @bufpool: the bufferpool function
*
* Set the given bufferpool function for the pad.
*/
void
gst_pad_set_bufferpool_function (GstPad *pad,
GstPadBufferPoolFunction bufpool)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_BUFFERPOOLFUNC (pad) = bufpool;
GST_DEBUG (GST_CAT_PADS,"bufferpoolfunc for %s:%s set to %s\n",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME(bufpool));
}
static void
gst_pad_push_func(GstPad *pad, GstBuffer *buf)
{
if (GST_RPAD_CHAINFUNC(GST_RPAD_PEER(pad)) != NULL) {
GST_DEBUG (GST_CAT_DATAFLOW,"calling chain function %s\n",
GST_DEBUG_FUNCPTR_NAME(GST_RPAD_CHAINFUNC(GST_RPAD_PEER(pad))));
(GST_RPAD_CHAINFUNC(GST_RPAD_PEER(pad)))(pad,buf);
} else {
GST_DEBUG (GST_CAT_DATAFLOW,"got a problem here: default pad_push handler in place, no chain function\n");
}
}
/**
* 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)
{
GstRealPad *realsrc, *realsink;
/* generic checks */
g_return_if_fail (srcpad != NULL);
g_return_if_fail (GST_IS_PAD (srcpad));
g_return_if_fail (sinkpad != NULL);
g_return_if_fail (GST_IS_PAD (sinkpad));
GST_INFO (GST_CAT_ELEMENT_PADS, "disconnecting %s:%s(%p) and %s:%s(%p)",
GST_DEBUG_PAD_NAME(srcpad), srcpad, GST_DEBUG_PAD_NAME(sinkpad), sinkpad);
// now we need to deal with the real/ghost stuff
realsrc = GST_PAD_REALIZE(srcpad);
realsink = GST_PAD_REALIZE(sinkpad);
g_return_if_fail (GST_RPAD_PEER(realsrc) != NULL);
g_return_if_fail (GST_RPAD_PEER(realsink) != NULL);
if ((GST_RPAD_DIRECTION(realsrc) == GST_PAD_SINK) &&
(GST_RPAD_DIRECTION(realsink) == GST_PAD_SRC)) {
GstRealPad *temppad;
temppad = realsrc;
realsrc = realsink;
realsink = temppad;
}
g_return_if_fail ((GST_RPAD_DIRECTION(realsrc) == GST_PAD_SRC) &&
(GST_RPAD_DIRECTION(realsink) == GST_PAD_SINK));
/* first clear peers */
GST_RPAD_PEER(realsrc) = NULL;
GST_RPAD_PEER(realsink) = NULL;
/* fire off a signal to each of the pads telling them that they've been disconnected */
g_signal_emit(G_OBJECT(realsrc), gst_real_pad_signals[REAL_DISCONNECTED], 0, realsink);
g_signal_emit(G_OBJECT(realsink), gst_real_pad_signals[REAL_DISCONNECTED], 0, realsrc);
// now tell the scheduler
if (realsrc->sched)
gst_scheduler_pad_connect (realsrc->sched, (GstPad *)realsrc, (GstPad *)realsink);
GST_INFO (GST_CAT_ELEMENT_PADS, "disconnected %s:%s and %s:%s",
GST_DEBUG_PAD_NAME(srcpad), GST_DEBUG_PAD_NAME(sinkpad));
}
/**
* gst_pad_connect:
* @srcpad: the source pad to connect
* @sinkpad: the sink pad to connect
*
* Connects the source pad to the sink pad.
*
* You shouldn't use this API in a real application because the
* failure mode dumps diagnostics to stderr. A professional
* application should never fail, or use gst_pad_try_connect and
* check the return code.
*/
void
gst_pad_connect (GstPad *srcpad,
GstPad *sinkpad)
{
if (!gst_pad_try_connect (srcpad, sinkpad))
/* FIXME: g_critical is glib-2.0, not glib-1.2
g_critical ("couldn't connect %s:%s and %s:%s",
*/
g_warning ("couldn't connect %s:%s and %s:%s",
GST_DEBUG_PAD_NAME (srcpad),
GST_DEBUG_PAD_NAME (sinkpad));
}
/**
* gst_pad_try_connect:
* @srcpad: the source pad to connect
* @sinkpad: the sink pad to connect
*
* Connects the source pad to the sink pad.
*
* Returns: TRUE if the pad could be connected
*/
gboolean
gst_pad_try_connect (GstPad *srcpad,
GstPad *sinkpad)
{
GstRealPad *realsrc, *realsink;
gboolean negotiated = FALSE;
/* generic checks */
g_return_val_if_fail(srcpad != NULL, FALSE);
g_return_val_if_fail(GST_IS_PAD(srcpad), FALSE);
g_return_val_if_fail(sinkpad != NULL, FALSE);
g_return_val_if_fail(GST_IS_PAD(sinkpad), FALSE);
GST_INFO (GST_CAT_PADS, "connecting %s:%s and %s:%s",
GST_DEBUG_PAD_NAME(srcpad), GST_DEBUG_PAD_NAME(sinkpad));
// now we need to deal with the real/ghost stuff
realsrc = GST_PAD_REALIZE(srcpad);
realsink = GST_PAD_REALIZE(sinkpad);
if ((GST_PAD (realsrc) != srcpad) || (GST_PAD (realsink) != sinkpad))
GST_INFO (GST_CAT_PADS, "*actually* connecting %s:%s and %s:%s",
GST_DEBUG_PAD_NAME(realsrc), GST_DEBUG_PAD_NAME(realsink));
g_return_val_if_fail(GST_RPAD_PEER(realsrc) == NULL, FALSE);
g_return_val_if_fail(GST_RPAD_PEER(realsink) == NULL, FALSE);
/* check for reversed directions and swap if necessary */
if ((GST_RPAD_DIRECTION(realsrc) == GST_PAD_SINK) &&
(GST_RPAD_DIRECTION(realsink) == GST_PAD_SRC)) {
GstRealPad *temppad;
temppad = realsrc;
realsrc = realsink;
realsink = temppad;
}
g_return_val_if_fail((GST_RPAD_DIRECTION(realsrc) == GST_PAD_SRC) &&
(GST_RPAD_DIRECTION(realsink) == GST_PAD_SINK), FALSE);
/* first set peers */
GST_RPAD_PEER(realsrc) = realsink;
GST_RPAD_PEER(realsink) = realsrc;
if (GST_PAD_CAPS (srcpad)) {
GST_DEBUG(GST_CAT_PADS, "renegotiation from srcpad\n");
negotiated = gst_pad_renegotiate (srcpad);
}
else if (GST_PAD_CAPS (sinkpad)) {
GST_DEBUG(GST_CAT_PADS, "renegotiation from sinkpad\n");
negotiated = gst_pad_renegotiate (sinkpad);
}
else {
GST_DEBUG(GST_CAT_PADS, "not renegotiating connection\n");
negotiated = TRUE;
}
if (!negotiated) {
GST_INFO(GST_CAT_PADS, "pads %s:%s and %s:%s failed to negotiate, disconnecting",
GST_DEBUG_PAD_NAME(srcpad), GST_DEBUG_PAD_NAME(sinkpad));
gst_pad_disconnect (GST_PAD (realsrc), GST_PAD (realsink));
return FALSE;
}
/* fire off a signal to each of the pads telling them that they've been connected */
g_signal_emit(G_OBJECT(realsrc), gst_real_pad_signals[REAL_CONNECTED], 0, realsink);
g_signal_emit(G_OBJECT(realsink), gst_real_pad_signals[REAL_CONNECTED], 0, realsrc);
// now tell the scheduler(s)
if (realsrc->sched)
gst_scheduler_pad_connect (realsrc->sched, (GstPad *)realsrc, (GstPad *)realsink);
else if (realsink->sched)
gst_scheduler_pad_connect (realsink->sched, (GstPad *)realsrc, (GstPad *)realsink);
GST_INFO (GST_CAT_PADS, "connected %s:%s and %s:%s",
GST_DEBUG_PAD_NAME(srcpad), GST_DEBUG_PAD_NAME(sinkpad));
return TRUE;
}
/**
* 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 (GST_PAD_PARENT (pad) == NULL);
g_return_if_fail (parent != NULL);
g_return_if_fail (GST_IS_OBJECT (parent));
g_return_if_fail ((gpointer)pad != (gpointer)parent);
gst_object_set_parent (GST_OBJECT (pad), parent);
}
/**
* gst_pad_get_parent:
* @pad: the pad to get the parent from
*
* Get the parent object of this pad.
*
* Returns: the parent object
*/
GstElement*
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 GST_PAD_PARENT (pad);
}
/**
* gst_pad_get_padtemplate:
* @pad: the pad to get the padtemplate from
*
* Get the padtemplate object of this pad.
*
* Returns: the padtemplate object
*/
GstPadTemplate*
gst_pad_get_padtemplate (GstPad *pad)
{
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
return GST_PAD_PADTEMPLATE (pad);
}
/**
* gst_pad_set_sched:
* @pad: the pad to set the scheduler for
* @sched: The scheduler to set
*
* Set the sceduler for the pad
*/
void
gst_pad_set_sched (GstPad *pad, GstScheduler *sched)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
GST_RPAD_SCHED(pad) = sched;
}
/**
* gst_pad_get_sched:
* @pad: the pad to get the scheduler from
*
* Get the scheduler of the pad
*
* Returns: the scheduler of the pad.
*/
GstScheduler*
gst_pad_get_sched (GstPad *pad)
{
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
return GST_RPAD_SCHED(pad);
}
/**
* gst_pad_get_real_parent:
* @pad: the pad to get the parent from
*
* Get the real parent object of this pad. If the pad
* is a ghostpad, the actual owner of the real pad is
* returned, as opposed to the gst_pad_get_parent().
*
* Returns: the parent object
*/
GstElement*
gst_pad_get_real_parent (GstPad *pad)
{
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
return GST_PAD_PARENT (GST_PAD (GST_PAD_REALIZE (pad)));
}
/**
* gst_pad_add_ghost_pad:
* @pad: the pad to set the ghost parent
* @ghostpad: the ghost pad to add
*
* Add a ghost pad to a pad.
*/
void
gst_pad_add_ghost_pad (GstPad *pad,
GstPad *ghostpad)
{
GstRealPad *realpad;
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (ghostpad != NULL);
g_return_if_fail (GST_IS_GHOST_PAD (ghostpad));
realpad = GST_PAD_REALIZE(pad);
realpad->ghostpads = g_list_prepend (realpad->ghostpads, ghostpad);
}
/**
* gst_pad_remove_ghost_pad:
* @pad: the pad to remove the ghost parent
* @ghostpad: the ghost pad to remove from the pad
*
* Remove a ghost pad from a pad.
*/
void
gst_pad_remove_ghost_pad (GstPad *pad,
GstPad *ghostpad)
{
GstRealPad *realpad;
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (ghostpad != NULL);
g_return_if_fail (GST_IS_GHOST_PAD (ghostpad));
realpad = GST_PAD_REALIZE (pad);
realpad->ghostpads = g_list_remove (realpad->ghostpads, ghostpad);
}
/**
* gst_pad_get_ghost_pad_list:
* @pad: the pad to get the ghost parents from
*
* Get the ghost parents of this pad.
*
* Returns: a GList of ghost pads
*/
GList*
gst_pad_get_ghost_pad_list (GstPad *pad)
{
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
return GST_PAD_REALIZE(pad)->ghostpads;
}
/**
* gst_pad_set_caps:
* @pad: the pad to set the caps to
* @caps: the capabilities to attach to this pad
*
* Set the capabilities of this pad.
*
* Returns: a boolean indicating the caps could be set on the pad
*/
gboolean
gst_pad_set_caps (GstPad *pad,
GstCaps *caps)
{
GstCaps *oldcaps;
g_return_val_if_fail (pad != NULL, FALSE);
g_return_val_if_fail (GST_IS_REAL_PAD (pad), FALSE); // NOTE this restriction
GST_INFO (GST_CAT_CAPS, "setting caps %p on pad %s:%s",
caps, GST_DEBUG_PAD_NAME(pad));
if (!gst_caps_check_compatibility (caps, gst_pad_get_padtemplate_caps (pad))) {
g_warning ("pad %s:%s tried to set caps incompatible with its padtemplate\n",
GST_DEBUG_PAD_NAME (pad));
//return FALSE;
}
oldcaps = GST_PAD_CAPS (pad);
if (caps)
gst_caps_ref (caps);
GST_PAD_CAPS(pad) = caps;
if (oldcaps)
gst_caps_unref (oldcaps);
return gst_pad_renegotiate (pad);
}
/**
* 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);
if (GST_PAD_CAPS (pad))
return GST_PAD_CAPS (pad);
else if (GST_PAD_PADTEMPLATE (pad))
return GST_PADTEMPLATE_CAPS (GST_PAD_PADTEMPLATE (pad));
return NULL;
}
/**
* gst_pad_get_padtemplate_caps:
* @pad: the pad to get the capabilities from
*
* Get the capabilities of this pad.
*
* Returns: a list of the capabilities of this pad
*/
GstCaps*
gst_pad_get_padtemplate_caps (GstPad *pad)
{
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
if (GST_PAD_PADTEMPLATE (pad))
return GST_PADTEMPLATE_CAPS (GST_PAD_PADTEMPLATE (pad));
return NULL;
}
/**
* gst_padtemplate_get_caps_by_name:
* @templ: the padtemplate to get the capabilities from
* @name: the name of the capability to get
*
* Get the capability with the given name from this padtemplate.
*
* Returns: a capability or NULL if not found
*/
GstCaps*
gst_padtemplate_get_caps_by_name (GstPadTemplate *templ, const gchar *name)
{
GstCaps *caps;
g_return_val_if_fail (templ != NULL, NULL);
caps = GST_PADTEMPLATE_CAPS (templ);
if (!caps)
return NULL;
return gst_caps_get_by_name (caps, name);
}
/**
* gst_pad_check_compatibility:
* @srcpad: the srcpad to check
* @sinkpad: the sinkpad to check against
*
* Check if two pads have compatible capabilities.
*
* Returns: TRUE if they are compatible or the capabilities
* could not be checked
*/
gboolean
gst_pad_check_compatibility (GstPad *srcpad, GstPad *sinkpad)
{
g_return_val_if_fail (srcpad != NULL, FALSE);
g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE);
g_return_val_if_fail (sinkpad != NULL, FALSE);
g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE);
if (GST_PAD_CAPS(srcpad) && GST_PAD_CAPS(sinkpad)) {
if (!gst_caps_check_compatibility (GST_PAD_CAPS(srcpad), GST_PAD_CAPS(sinkpad))) {
return FALSE;
}
else {
return TRUE;
}
}
else {
GST_DEBUG (GST_CAT_PADS,"could not check capabilities of pads (%s:%s) and (%s:%s) %p %p\n",
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad),
GST_PAD_CAPS (srcpad), GST_PAD_CAPS (sinkpad));
return TRUE;
}
}
/**
* 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 GST_PAD(GST_PAD_PEER(pad));
}
/**
* gst_pad_get_bufferpool:
* @pad: the pad to get the bufferpool from
*
* Get the bufferpool of the peer pad of the given
* pad
*
* Returns: The GstBufferPool or NULL.
*/
GstBufferPool*
gst_pad_get_bufferpool (GstPad *pad)
{
GstRealPad *peer;
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
peer = GST_RPAD_PEER(pad);
g_return_val_if_fail (peer != NULL, NULL);
GST_DEBUG_ENTER("(%s:%s)",GST_DEBUG_PAD_NAME(pad));
if (peer->bufferpoolfunc) {
GST_DEBUG (GST_CAT_PADS,"calling bufferpoolfunc &%s (@%p) of peer pad %s:%s\n",
GST_DEBUG_FUNCPTR_NAME(peer->bufferpoolfunc),&peer->bufferpoolfunc,GST_DEBUG_PAD_NAME(((GstPad*)peer)));
return (peer->bufferpoolfunc)(((GstPad*)peer));
} else {
GST_DEBUG (GST_CAT_PADS,"no bufferpoolfunc for peer pad %s:%s at %p\n",GST_DEBUG_PAD_NAME(((GstPad*)peer)),&peer->bufferpoolfunc);
return NULL;
}
}
static void
gst_real_pad_dispose (GObject *object)
{
GstPad *pad = GST_PAD (object);
GST_DEBUG (GST_CAT_REFCOUNTING, "dispose %s:%s\n", GST_DEBUG_PAD_NAME(pad));
if (GST_PAD (pad)->padtemplate){
GST_DEBUG (GST_CAT_REFCOUNTING, "unreffing padtemplate'%s'\n",GST_OBJECT_NAME(GST_OBJECT (GST_PAD (pad)->padtemplate)));
gst_object_unref (GST_OBJECT (GST_PAD (pad)->padtemplate));
}
if (GST_PAD_PEER (pad)){
GST_DEBUG (GST_CAT_REFCOUNTING, "disconnecting pad '%s'\n",GST_OBJECT_NAME(GST_OBJECT (GST_PAD (GST_PAD_PEER (pad)))));
gst_pad_disconnect (pad, GST_PAD (GST_PAD_PEER (pad)));
}
if (GST_IS_ELEMENT (GST_OBJECT_PARENT (pad))){
GST_DEBUG (GST_CAT_REFCOUNTING, "removing pad from element '%s'\n",GST_OBJECT_NAME(GST_OBJECT (GST_ELEMENT (GST_OBJECT_PARENT (pad)))));
gst_element_remove_pad (GST_ELEMENT (GST_OBJECT_PARENT (pad)), pad);
}
// FIXME we should destroy the ghostpads, because they are nothing without the real pad
if (GST_REAL_PAD (pad)->ghostpads) {
GList *orig, *ghostpads;
orig = ghostpads = g_list_copy (GST_REAL_PAD (pad)->ghostpads);
while (ghostpads) {
GstPad *ghostpad = GST_PAD (ghostpads->data);
if (GST_IS_ELEMENT (GST_OBJECT_PARENT (ghostpad))){
GST_DEBUG (GST_CAT_REFCOUNTING, "removing ghost pad from element '%s'\n", GST_OBJECT_NAME(GST_OBJECT_PARENT (ghostpad)));
gst_element_remove_pad (GST_ELEMENT (GST_OBJECT_PARENT (ghostpad)), ghostpad);
}
ghostpads = g_list_next (ghostpads);
}
g_list_free (orig);
g_list_free (GST_REAL_PAD(pad)->ghostpads);
}
G_OBJECT_CLASS (real_pad_parent_class)->dispose (object);
}
#ifndef GST_DISABLE_LOADSAVE
/**
* gst_pad_load_and_connect:
* @self: the XML node to read the description from
* @parent: the element that has the pad
*
* Read the pad definition from the XML node and connect the given pad
* in element to a pad of an element up in the hierarchy.
*/
void
gst_pad_load_and_connect (xmlNodePtr self,
GstObject *parent)
{
xmlNodePtr field = self->xmlChildrenNode;
GstPad *pad = NULL, *targetpad;
guchar *peer = NULL;
gchar **split;
GstElement *target;
GstObject *grandparent;
while (field) {
if (!strcmp (field->name, "name")) {
pad = gst_element_get_pad (GST_ELEMENT (parent), xmlNodeGetContent (field));
}
else if (!strcmp(field->name, "peer")) {
peer = 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);
grandparent = gst_object_get_parent (parent);
if (grandparent && GST_IS_BIN (grandparent)) {
target = gst_bin_get_by_name_recurse_up (GST_BIN (grandparent), split[0]);
}
else
goto cleanup;
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);
}
#endif // GST_DISABLE_LOADSAVE
static gboolean
gst_pad_renegotiate_func (GstPad *pad, gpointer *data1, GstPad *peerpad, gpointer *data2, GstCaps **newcaps)
{
GstRealPad *currentpad, *otherpad;
gpointer *currentdata, *otherdata;
GstPadNegotiateReturn result;
gint counter = 0;
g_return_val_if_fail (pad != NULL, FALSE);
currentpad = GST_PAD_REALIZE (pad);
otherpad = GST_REAL_PAD (peerpad);
currentdata = data1;
otherdata = data2;
GST_DEBUG (GST_CAT_NEGOTIATION, "negotiating pad %s:%s and %s:%s data:%p\n",
GST_DEBUG_PAD_NAME(currentpad), GST_DEBUG_PAD_NAME(otherpad), currentdata);
do {
gboolean matchtempl;
if (!*newcaps) {
if (otherpad->negotiatefunc) {
GstRealPad *temp;
gpointer *tempdata;
GST_DEBUG (GST_CAT_NEGOTIATION, "requesting other caps from pad %s:%s data:%p\n",
GST_DEBUG_PAD_NAME(otherpad), otherdata);
otherpad->negotiatefunc (GST_PAD (otherpad), newcaps, otherdata);
temp = otherpad;
otherpad = currentpad;
currentpad = temp;
tempdata = otherdata;
otherdata = currentdata;
currentdata = tempdata;
}
}
GST_DEBUG (GST_CAT_NEGOTIATION, "checking compatibility with pad %s:%s\n",
GST_DEBUG_PAD_NAME(otherpad));
matchtempl = gst_caps_check_compatibility (*newcaps, gst_pad_get_padtemplate_caps (GST_PAD (otherpad)));
GST_DEBUG (GST_CAT_NEGOTIATION, "caps compatibility check %s\n", (matchtempl?"ok":"fail"));
if (matchtempl) {
GST_DEBUG (GST_CAT_NEGOTIATION, "checking if other pad %s:%s can negotiate data:%p\n",
GST_DEBUG_PAD_NAME(otherpad), otherdata);
if (otherpad->negotiatefunc) {
GstRealPad *temp;
gpointer *tempdata;
GST_DEBUG (GST_CAT_NEGOTIATION, "switching pad for next phase\n");
temp = currentpad;
currentpad = otherpad;
otherpad = temp;
tempdata = otherdata;
otherdata = currentdata;
currentdata = tempdata;
}
else if (gst_caps_check_compatibility (*newcaps, GST_PAD_CAPS (otherpad))) {
GST_DEBUG (GST_CAT_NEGOTIATION, "negotiation succeeded\n");
return TRUE;
}
else {
*newcaps = GST_PAD_CAPS (otherpad);
if (*newcaps) gst_caps_ref(*newcaps);
}
}
else {
*newcaps = GST_PAD_CAPS (otherpad);
if (*newcaps) gst_caps_ref(*newcaps);
}
counter++;
if (currentpad->negotiatefunc) {
GST_DEBUG (GST_CAT_NEGOTIATION, "calling negotiate function on pad %s:%s data: %p\n",
GST_DEBUG_PAD_NAME (currentpad), currentdata);
result = currentpad->negotiatefunc (GST_PAD (currentpad), newcaps, currentdata);
switch (result) {
case GST_PAD_NEGOTIATE_FAIL:
GST_DEBUG (GST_CAT_NEGOTIATION, "negotiation failed\n");
return FALSE;
case GST_PAD_NEGOTIATE_AGREE:
GST_DEBUG (GST_CAT_NEGOTIATION, "negotiation succeeded\n");
return TRUE;
case GST_PAD_NEGOTIATE_TRY:
GST_DEBUG (GST_CAT_NEGOTIATION, "try another option\n");
break;
default:
GST_DEBUG (GST_CAT_NEGOTIATION, "invalid return\n");
break;
}
}
else {
GST_DEBUG (GST_CAT_NEGOTIATION, "negotiation failed, no more options\n");
return FALSE;
}
} while (counter < 100);
g_warning ("negotiation between (%s:%s) and (%s:%s) failed: too many attempts (%d)\n",
GST_DEBUG_PAD_NAME(pad), GST_DEBUG_PAD_NAME(peerpad), counter);
GST_DEBUG (GST_CAT_NEGOTIATION, "negotiation failed, too many attempts\n");
return FALSE;
}
/**
* gst_pad_renegotiate:
* @pad: the pad to perform the negotiation on
*
* Perform the negotiation process with the peer pad.
*
* Returns: TRUE if the negotiation process succeded
*/
gboolean
gst_pad_renegotiate (GstPad *pad)
{
GstCaps *newcaps = NULL;
GstRealPad *peerpad, *currentpad, *otherpad;
gboolean result;
gpointer data1 = NULL, data2 = NULL;
g_return_val_if_fail (pad != NULL, FALSE);
peerpad = GST_PAD_PEER (pad);
currentpad = GST_PAD_REALIZE (pad);
if (!peerpad) {
GST_DEBUG (GST_CAT_NEGOTIATION, "no peer pad for pad %s:%s\n",
GST_DEBUG_PAD_NAME(currentpad));
return TRUE;
}
otherpad = GST_REAL_PAD (peerpad);
GST_INFO (GST_CAT_NEGOTIATION, "negotiating pad %s:%s and %s:%s",
GST_DEBUG_PAD_NAME(pad), GST_DEBUG_PAD_NAME(peerpad));
newcaps = GST_PAD_CAPS (pad);
result = gst_pad_renegotiate_func (GST_PAD (currentpad), &data1, GST_PAD (otherpad), &data2, &newcaps);
if (!result) {
GST_DEBUG (GST_CAT_NEGOTIATION, "firing caps_nego_failed signal on %s:%s and %s:%s to give it a chance to succeed\n",
GST_DEBUG_PAD_NAME(currentpad),GST_DEBUG_PAD_NAME(otherpad));
g_signal_emit (G_OBJECT(currentpad),
gst_real_pad_signals[REAL_CAPS_NEGO_FAILED], 0, &result);
g_signal_emit (G_OBJECT(otherpad),
gst_real_pad_signals[REAL_CAPS_NEGO_FAILED], 0, &result);
if (result)
GST_DEBUG (GST_CAT_NEGOTIATION, "caps_nego_failed handler claims success at renego, believing\n");
}
if (result) {
GST_DEBUG (GST_CAT_NEGOTIATION, "pads aggreed on caps :)\n");
newcaps = GST_PAD_CAPS (pad);
//g_return_val_if_fail(newcaps != NULL, FALSE); // FIXME is this valid?
/* here we have some sort of aggreement of the caps */
GST_PAD_CAPS (currentpad) = gst_caps_ref (newcaps);
if (GST_RPAD_NEWCAPSFUNC (currentpad))
GST_RPAD_NEWCAPSFUNC (currentpad) (GST_PAD (currentpad), newcaps);
GST_PAD_CAPS (otherpad) = gst_caps_ref (newcaps);
if (GST_RPAD_NEWCAPSFUNC (otherpad))
GST_RPAD_NEWCAPSFUNC (otherpad) (GST_PAD (otherpad), newcaps);
GST_DEBUG (GST_CAT_NEGOTIATION, "firing caps_changed signal on %s:%s and %s:%s\n",
GST_DEBUG_PAD_NAME(currentpad),GST_DEBUG_PAD_NAME(otherpad));
g_signal_emit (G_OBJECT(currentpad),
gst_real_pad_signals[REAL_CAPS_CHANGED], 0, GST_PAD_CAPS(currentpad));
g_signal_emit (G_OBJECT(otherpad),
gst_real_pad_signals[REAL_CAPS_CHANGED], 0, GST_PAD_CAPS(otherpad));
}
return result;
}
/**
* gst_pad_negotiate_proxy:
* @srcpad: the pad that proxies
* @destpad: the pad to proxy the negotiation to
* @caps: the current caps
*
* Proxies the negotiation pad from srcpad to destpad. Further
* negotiation is done on the peers of both pad instead.
*
* Returns: the result of the negotiation preocess.
*/
GstPadNegotiateReturn
gst_pad_negotiate_proxy (GstPad *srcpad, GstPad *destpad, GstCaps **caps)
{
GstRealPad *srcpeer;
GstRealPad *destpeer;
gboolean result;
gpointer data1 = NULL, data2 = NULL;
g_return_val_if_fail (srcpad != NULL, GST_PAD_NEGOTIATE_FAIL);
g_return_val_if_fail (destpad != NULL, GST_PAD_NEGOTIATE_FAIL);
GST_DEBUG (GST_CAT_NEGOTIATION, "negotiation proxied from pad (%s:%s) to pad (%s:%s)\n",
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (destpad));
srcpeer = GST_RPAD_PEER (srcpad);
destpeer = GST_RPAD_PEER (destpad);
if (srcpeer && destpeer) {
result = gst_pad_renegotiate_func (GST_PAD (srcpeer), &data1, GST_PAD (destpeer), &data2, caps);
if (result) {
GST_DEBUG (GST_CAT_NEGOTIATION, "pads (%s:%s) and (%s:%s) aggreed on caps :)\n",
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (destpad));
/* here we have some sort of aggreement of the caps */
GST_PAD_CAPS (destpeer) = *caps;
if (GST_RPAD_NEWCAPSFUNC (destpeer))
GST_RPAD_NEWCAPSFUNC (destpeer) (GST_PAD (destpeer), *caps);
GST_PAD_CAPS (destpad) = *caps;
if (GST_RPAD_NEWCAPSFUNC (destpad))
GST_RPAD_NEWCAPSFUNC (destpad) (GST_PAD (destpad), *caps);
}
else {
GST_DEBUG (GST_CAT_NEGOTIATION, "pads did not aggree on caps :(\n");
return GST_PAD_NEGOTIATE_FAIL;
}
}
else {
GST_PAD_CAPS (destpad) = *caps;
if (GST_RPAD_NEWCAPSFUNC (destpad))
GST_RPAD_NEWCAPSFUNC (destpad) (GST_PAD (destpad), *caps);
}
return GST_PAD_NEGOTIATE_AGREE;
}
#ifndef GST_DISABLE_LOADSAVE
/**
* 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
*/
static xmlNodePtr
gst_pad_save_thyself (GstObject *object,
xmlNodePtr parent)
{
GstRealPad *realpad;
GstPad *peer;
g_return_val_if_fail (GST_IS_REAL_PAD (object), NULL);
realpad = GST_REAL_PAD(object);
xmlNewChild(parent,NULL,"name", GST_PAD_NAME (realpad));
if (GST_RPAD_PEER(realpad) != NULL) {
peer = GST_PAD(GST_RPAD_PEER(realpad));
// first check to see if the peer's parent's parent is the same
// we just save it off
xmlNewChild(parent,NULL,"peer",g_strdup_printf("%s.%s",
GST_OBJECT_NAME (GST_PAD_PARENT (peer)), GST_PAD_NAME (peer)));
} 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;
g_return_val_if_fail (GST_IS_GHOST_PAD (pad), NULL);
self = xmlNewChild(parent,NULL,"ghostpad",NULL);
xmlNewChild(self,NULL,"name", GST_PAD_NAME (pad));
xmlNewChild(self,NULL,"parent", GST_OBJECT_NAME (GST_PAD_PARENT (pad)));
// FIXME FIXME FIXME!
return self;
}
#endif /* GST_DISABLE_LOADSAVE */
#ifndef gst_pad_push
/**
* gst_pad_push:
* @pad: the pad to push
* @buf: the buffer to push
*
* Push a buffer to the peer of the pad.
*/
void
gst_pad_push (GstPad *pad, GstBuffer *buf)
{
GstRealPad *peer = GST_RPAD_PEER (pad);
GST_DEBUG_ENTER ("(%s:%s)", GST_DEBUG_PAD_NAME (pad));
g_return_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SRC);
g_return_if_fail (peer != NULL);
if (peer->chainhandler) {
GST_DEBUG (GST_CAT_DATAFLOW, "calling chainhandler &%s of peer pad %s:%s\n",
GST_DEBUG_FUNCPTR_NAME (peer->chainhandler), GST_DEBUG_PAD_NAME (((GstPad*)peer)));
(peer->chainhandler) (((GstPad*)peer), buf);
}
else {
GST_DEBUG (GST_CAT_DATAFLOW, "no chainhandler\n");
}
}
#endif
#ifndef gst_pad_pull
/**
* gst_pad_pull:
* @pad: the pad to pull
*
* Pull a buffer from the peer pad.
*
* Returns: a new buffer from the peer pad.
*/
GstBuffer*
gst_pad_pull (GstPad *pad)
{
GstRealPad *peer = GST_RPAD_PEER(pad);
GST_DEBUG_ENTER("(%s:%s)",GST_DEBUG_PAD_NAME(pad));
g_return_val_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SINK, NULL);
if (!peer)
{
/* FIXME: g_critical is glib-2.0, not glib-1.2
g_critical ("gst_pad_pull but %s:%s is unconnected", GST_DEBUG_PAD_NAME(pad));
*/
g_warning ("gst_pad_pull but %s:%s is unconnected", GST_DEBUG_PAD_NAME(pad));
return NULL;
}
if (peer->gethandler) {
GST_DEBUG (GST_CAT_DATAFLOW,"calling gethandler %s of peer pad %s:%s\n",
GST_DEBUG_FUNCPTR_NAME(peer->gethandler),GST_DEBUG_PAD_NAME(peer));
return (peer->gethandler)(((GstPad*)peer));
} else {
GST_DEBUG (GST_CAT_DATAFLOW,"no gethandler for peer pad %s:%s at %p\n",GST_DEBUG_PAD_NAME(((GstPad*)peer)),&peer->gethandler);
return NULL;
}
}
#endif
#ifndef gst_pad_pullregion
/**
* gst_pad_pullregion:
* @pad: the pad to pull the region from
* @type: the regiontype
* @offset: the offset/start of the buffer to pull
* @len: the length of the buffer to pull
*
* Pull a buffer region from the peer pad. The region to pull can be
* specified with a offset/lenght pair or with a start/legnth time
* indicator as specified by the type parameter.
*
* Returns: a new buffer from the peer pad with data in the specified
* region.
*/
GstBuffer*
gst_pad_pullregion (GstPad *pad, GstRegionType type, guint64 offset, guint64 len)
{
GstRealPad *peer;
GstBuffer *result = NULL;
g_return_val_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SINK, NULL);
do {
peer = GST_RPAD_PEER(pad);
g_return_val_if_fail (peer != NULL, NULL);
if (result)
gst_buffer_unref (result);
GST_DEBUG_ENTER("(%s:%s,%d,%lld,%lld)",GST_DEBUG_PAD_NAME(pad),type,offset,len);
if (peer->pullregionfunc) {
GST_DEBUG (GST_CAT_DATAFLOW,"calling pullregionfunc &%s of peer pad %s:%s\n",
GST_DEBUG_FUNCPTR_NAME(peer->pullregionfunc),GST_DEBUG_PAD_NAME(((GstPad*)peer)));
result = (peer->pullregionfunc)(((GstPad*)peer),type,offset,len);
} else {
GST_DEBUG (GST_CAT_DATAFLOW,"no pullregionfunc\n");
result = NULL;
break;
}
}
while (result && ! GST_BUFFER_FLAG_IS_SET (result, GST_BUFFER_EOS)
&& !(GST_BUFFER_OFFSET (result) == offset &&
GST_BUFFER_SIZE (result) == len));
return result;
}
#endif
/**
* gst_pad_peek:
* @pad: the pad to peek
*
* Peek for a buffer from the peer pad.
*
* Returns: a from the peer pad or NULL if the peer has no buffer.
*/
GstBuffer*
gst_pad_peek (GstPad *pad)
{
g_return_val_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SINK, NULL);
return GST_RPAD_BUFPEN (GST_RPAD_PEER (pad));
}
/**
* gst_pad_select:
* @padlist: A list of pads
*
* Wait for a buffer on the list of pads.
*
* Returns: The pad that has a buffer available, use
* #gst_pad_pull to get the buffer.
*/
GstPad*
gst_pad_select (GList *padlist)
{
GstPad *pad;
pad = gst_scheduler_pad_select (gst_pad_get_sched (GST_PAD (padlist->data)), padlist);
return pad;
}
/**
* gst_pad_selectv:
* @pad: The first pad to perform the select on
* @...: More pads
*
* Wait for a buffer on the given of pads.
*
* Returns: The pad that has a buffer available, use
* #gst_pad_pull to get the buffer.
*/
GstPad*
gst_pad_selectv (GstPad *pad, ...)
{
GstPad *result;
GList *padlist = NULL;
va_list var_args;
if (pad == NULL)
return NULL;
va_start (var_args, pad);
while (pad) {
padlist = g_list_prepend (padlist, pad);
pad = va_arg (var_args, GstPad *);
}
result = gst_pad_select (padlist);
g_list_free (padlist);
va_end (var_args);
return result;
}
/************************************************************************
*
* templates
*
*/
static void gst_padtemplate_class_init (GstPadTemplateClass *klass);
static void gst_padtemplate_init (GstPadTemplate *templ);
enum {
TEMPL_PAD_CREATED,
/* FILL ME */
TEMPL_LAST_SIGNAL
};
static GstObject *padtemplate_parent_class = NULL;
static guint gst_padtemplate_signals[TEMPL_LAST_SIGNAL] = { 0 };
GType
gst_padtemplate_get_type (void)
{
static GType padtemplate_type = 0;
if (!padtemplate_type) {
static const GTypeInfo padtemplate_info = {
sizeof(GstPadTemplateClass),
NULL,
NULL,
(GClassInitFunc)gst_padtemplate_class_init,
NULL,
NULL,
sizeof(GstPadTemplate),
32,
(GInstanceInitFunc)gst_padtemplate_init,
NULL
};
padtemplate_type = g_type_register_static(GST_TYPE_OBJECT, "GstPadTemplate", &padtemplate_info, 0);
}
return padtemplate_type;
}
static void
gst_padtemplate_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_padtemplate_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);
gstobject_class->path_string_separator = "*";
}
static void
gst_padtemplate_init (GstPadTemplate *templ)
{
}
/**
* gst_padtemplate_new:
* @name_template: the name template
* @direction: the direction for the template
* @presence: the presence of the pad
* @caps: a list of capabilities for the template
* @...: more capabilities
*
* Creates a new padtemplate from the given arguments.
*
* Returns: the new padtemplate
*/
GstPadTemplate*
gst_padtemplate_new (gchar *name_template,
GstPadDirection direction, GstPadPresence presence,
GstCaps *caps, ...)
{
GstPadTemplate *new;
va_list var_args;
GstCaps *thecaps = NULL;
g_return_val_if_fail (name_template != NULL, NULL);
new = g_object_new(gst_padtemplate_get_type () ,NULL);
GST_PADTEMPLATE_NAME_TEMPLATE (new) = name_template;
GST_PADTEMPLATE_DIRECTION (new) = direction;
GST_PADTEMPLATE_PRESENCE (new) = presence;
va_start (var_args, caps);
while (caps) {
thecaps = gst_caps_append (thecaps, caps);
caps = va_arg (var_args, GstCaps*);
}
va_end (var_args);
GST_PADTEMPLATE_CAPS (new) = thecaps;
return new;
}
/**
* gst_padtemplate_get_caps:
* @templ: the padtemplate to use
*
* Get the capabilities of the padtemplate
*
* Returns: a GstCaps*
*/
GstCaps*
gst_padtemplate_get_caps (GstPadTemplate *templ)
{
g_return_val_if_fail (templ != NULL, NULL);
return GST_PADTEMPLATE_CAPS (templ);
}
#ifndef GST_DISABLE_LOADSAVE
/**
* gst_padtemplate_save_thyself:
* @templ: 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 *templ, xmlNodePtr parent)
{
xmlNodePtr subtree;
guchar *presence;
GST_DEBUG (GST_CAT_XML,"saving padtemplate %s\n", templ->name_template);
xmlNewChild(parent,NULL,"nametemplate", templ->name_template);
xmlNewChild(parent,NULL,"direction", (templ->direction == GST_PAD_SINK? "sink":"src"));
switch (templ->presence) {
case GST_PAD_ALWAYS:
presence = "always";
break;
case GST_PAD_SOMETIMES:
presence = "sometimes";
break;
case GST_PAD_REQUEST:
presence = "request";
break;
default:
presence = "unknown";
break;
}
xmlNewChild(parent,NULL,"presence", presence);
if (GST_PADTEMPLATE_CAPS (templ)) {
subtree = xmlNewChild (parent, NULL, "caps", NULL);
gst_caps_save_thyself (GST_PADTEMPLATE_CAPS (templ), 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->xmlChildrenNode;
GstPadTemplate *factory;
gchar *name_template = NULL;
GstPadDirection direction = GST_PAD_UNKNOWN;
GstPadPresence presence = GST_PAD_ALWAYS;
GstCaps *caps = NULL;
while (field) {
if (!strcmp(field->name, "nametemplate")) {
name_template = xmlNodeGetContent(field);
}
if (!strcmp(field->name, "direction")) {
gchar *value = xmlNodeGetContent(field);
if (!strcmp(value, "sink")) {
direction = GST_PAD_SINK;
}
else if (!strcmp(value, "src")) {
direction = GST_PAD_SRC;
}
g_free (value);
}
if (!strcmp(field->name, "presence")) {
gchar *value = xmlNodeGetContent(field);
if (!strcmp(value, "always")) {
presence = GST_PAD_ALWAYS;
}
else if (!strcmp(value, "sometimes")) {
presence = GST_PAD_SOMETIMES;
}
else if (!strcmp(value, "request")) {
presence = GST_PAD_REQUEST;
}
g_free (value);
}
else if (!strcmp(field->name, "caps")) {
caps = gst_caps_load_thyself (field);
}
field = field->next;
}
factory = gst_padtemplate_new (name_template, direction, presence, caps, NULL);
return factory;
}
#endif /* !GST_DISABLE_LOADSAVE */
/**
* gst_pad_set_element_private:
* @pad: the pad to set the private data to
* @priv: The private data to attach to the pad
*
* Set the given private data pointer to the pad. This
* function can only be used by the element that own the
* pad.
*/
void
gst_pad_set_element_private (GstPad *pad, gpointer priv)
{
pad->element_private = priv;
}
/**
* gst_pad_get_element_private:
* @pad: the pad to get the private data of
*
* Get the private data of a pad. The private data can
* only be set by the parent element of this pad.
*
* Returns: a pointer to the private data.
*/
gpointer
gst_pad_get_element_private (GstPad *pad)
{
return pad->element_private;
}
/***** ghost pads *****/
GType _gst_ghost_pad_type = 0;
static void gst_ghost_pad_class_init (GstGhostPadClass *klass);
static void gst_ghost_pad_init (GstGhostPad *pad);
static GstPad *ghost_pad_parent_class = NULL;
//static guint gst_ghost_pad_signals[LAST_SIGNAL] = { 0 };
GType
gst_ghost_pad_get_type(void) {
if (!_gst_ghost_pad_type) {
static const GTypeInfo pad_info = {
sizeof(GstGhostPadClass),
NULL,
NULL,
(GClassInitFunc)gst_ghost_pad_class_init,
NULL,
NULL,
sizeof(GstGhostPad),
8,
(GInstanceInitFunc)gst_ghost_pad_init,
NULL
};
_gst_ghost_pad_type = g_type_register_static(GST_TYPE_PAD, "GstGhostPad", &pad_info, 0);
}
return _gst_ghost_pad_type;
}
static void
gst_ghost_pad_class_init (GstGhostPadClass *klass)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass*)klass;
ghost_pad_parent_class = g_type_class_ref(GST_TYPE_PAD);
}
static void
gst_ghost_pad_init (GstGhostPad *pad)
{
pad->realpad = NULL;
}
/**
* gst_ghost_pad_new:
* @name: name of the new ghost pad
* @pad: the pad to create a ghost pad of
*
* Create a new ghost pad associated with the given pad.
*
* Returns: new ghost pad
*/
GstPad*
gst_ghost_pad_new (gchar *name,
GstPad *pad)
{
GstGhostPad *ghostpad;
g_return_val_if_fail (name != NULL, NULL);
g_return_val_if_fail (GST_IS_PAD(pad), NULL);
ghostpad = g_object_new(gst_ghost_pad_get_type () ,NULL);
gst_pad_set_name (GST_PAD (ghostpad), name);
GST_GPAD_REALPAD(ghostpad) = GST_PAD_REALIZE(pad);
GST_PAD_PADTEMPLATE(ghostpad) = GST_PAD_PADTEMPLATE(pad);
// add ourselves to the real pad's list of ghostpads
gst_pad_add_ghost_pad (pad, GST_PAD(ghostpad));
// FIXME need to ref the real pad here... ?
GST_DEBUG(GST_CAT_PADS,"created ghost pad \"%s\"\n",name);
return GST_PAD(ghostpad);
}
/**
* gst_pad_event_default:
* @pad: the pad to operate on
* @event: the event to handle
*
* Invoke the default event handler for the given pad.
*/
void
gst_pad_event_default (GstPad *pad, GstEvent *event)
{
GstElement *element = GST_PAD_PARENT (pad);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
// gst_element_signal_eos (element);
gst_element_set_state (element, GST_STATE_PAUSED);
{
GList *pads = element->pads;
while (pads) {
if (GST_PAD_DIRECTION (pads->data) == GST_PAD_SRC && GST_PAD_CONNECTED (pads->data)) {
gst_pad_push (GST_PAD (pads->data), GST_BUFFER (gst_event_new (GST_EVENT_TYPE (event))));
}
pads = g_list_next (pads);
}
}
break;
default:
g_warning ("no default handler for event\n");
break;
}
gst_event_free (event);
}
/**
* gst_pad_send_event:
* @pad: the pad to send the event to
* @event: the event to send to the pad.
*
* Send the event to the pad.
*
* Returns: TRUE if the event was handled.
*/
gboolean
gst_pad_send_event (GstPad *pad, GstEvent *event)
{
gboolean handled = FALSE;
g_return_val_if_fail (event, FALSE);
GST_DEBUG (GST_CAT_EVENT, "have event %d on pad %s:%s\n",
GST_EVENT_TYPE (event), GST_DEBUG_PAD_NAME (pad));
if (GST_RPAD_EVENTFUNC (pad))
handled = GST_RPAD_EVENTFUNC (pad) (pad, event);
else {
GST_DEBUG(GST_CAT_EVENT, "there's no event function for pad %s:%s\n", GST_DEBUG_PAD_NAME (pad));
}
if (!handled) {
GST_DEBUG(GST_CAT_EVENT, "would proceed with default behavior here\n");
gst_pad_event_default (pad, event);
handled = TRUE;
}
return handled;
}
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