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gstreamer/gst/gstpad.c
Wim Taymans c8e8981be8 Documentation updates 
Original commit message from CVS:
Documentation updates
Make spider forward bufferpools
Remove some old registry code
2002-06-12 22:26:36 +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"
#include "gstevent.h"
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 };
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);
static gboolean gst_pad_try_reconnect_filtered_func (GstRealPad *srcpad, GstRealPad *sinkpad,
GstCaps *caps, gboolean clear);
#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,
REAL_EVENT_RECEIVED,
/* 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);
gst_real_pad_signals[REAL_EVENT_RECEIVED] =
g_signal_new ("event_received", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstRealPadClass, event_received), 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->sched = NULL;
pad->sched_private = NULL;
pad->chainfunc = NULL;
pad->getfunc = NULL;
pad->chainhandler = GST_DEBUG_FUNCPTR (gst_pad_push_func);
pad->gethandler = NULL;
pad->bufferpoolfunc = NULL;
pad->ghostpads = NULL;
pad->caps = NULL;
pad->connectfunc = NULL;
pad->getcapsfunc = NULL;
pad->convertfunc = gst_pad_convert_default;
pad->eventfunc = gst_pad_event_default;
pad->convertfunc = gst_pad_convert_default;
pad->queryfunc = gst_pad_query_default;
pad->intconnfunc = gst_pad_get_internal_connections_default;
}
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", GST_DEBUG_PAD_NAME (object));
GST_FLAG_UNSET (object, GST_PAD_DISABLED);
} else {
GST_DEBUG (GST_CAT_PADS, "de-activating pad %s:%s", 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_custom_new:
* @type: the type of the pad
* @name: name of new pad
* @direction: either GST_PAD_SRC or GST_PAD_SINK
*
* Create a new pad with given name from the given type.
*
* Returns: new pad
*/
GstPad*
gst_pad_custom_new (GType type, const 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 (type, NULL);
gst_object_set_name (GST_OBJECT (pad), name);
GST_RPAD_DIRECTION (pad) = direction;
return GST_PAD (pad);
}
/**
* 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 (const gchar *name,
GstPadDirection direction)
{
return gst_pad_custom_new (gst_real_pad_get_type (), name, direction);
}
/**
* gst_pad_custom_new_from_template:
* @type: the custom GType for this pad
* @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_custom_new_from_template (GType type, GstPadTemplate *templ,
const 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_PAD_TEMPLATE (pad) = templ;
g_signal_emit (G_OBJECT (templ), gst_pad_template_signals[TEMPL_PAD_CREATED], 0, pad);
return 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,
const gchar *name)
{
return gst_pad_custom_new_from_template (gst_real_pad_get_type (), templ, name);
}
/**
* 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",
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",
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",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (event));
}
/**
* gst_pad_set_convert_function:
* @pad: the pad to set the event handler for
* @convert: the convert function
*
* Set the given convert function for the pad.
*/
void
gst_pad_set_convert_function (GstPad *pad,
GstPadConvertFunction convert)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_CONVERTFUNC(pad) = convert;
GST_DEBUG (GST_CAT_PADS, "convertfunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (convert));
}
/**
* gst_pad_set_query_function:
* @pad: the pad to set the event handler for
* @query: the query function
*
* Set the given query function for the pad.
*/
void
gst_pad_set_query_function (GstPad *pad, GstPadQueryFunction query)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_QUERYFUNC(pad) = query;
GST_DEBUG (GST_CAT_PADS, "queryfunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (query));
}
/**
* gst_pad_set_internal_connection_function:
* @pad: the pad to set the internal connection function for
* @intconn: the internal connection function
*
* Set the given internal connection function for the pad.
*/
void
gst_pad_set_internal_connection_function (GstPad *pad, GstPadIntConnFunction intconn)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_INTCONNFUNC(pad) = intconn;
GST_DEBUG (GST_CAT_PADS, "internal connection for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (intconn));
}
/**
* gst_pad_set_connect_function:
* @pad: the pad to set the connect function for
* @connect: the connect function
*
* Set the given connect function for the pad. It will be called
* when the pad is connected or reconnected with caps.
*/
void
gst_pad_set_connect_function (GstPad *pad,
GstPadConnectFunction connect)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_CONNECTFUNC (pad) = connect;
GST_DEBUG (GST_CAT_PADS, "connectfunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (connect));
}
/**
* gst_pad_set_getcaps_function:
* @pad: the pad to set the getcaps function for
* @getcaps: the getcaps function
*
* Set the given getcaps function for the pad.
*/
void
gst_pad_set_getcaps_function (GstPad *pad,
GstPadGetCapsFunction getcaps)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_GETCAPSFUNC (pad) = getcaps;
GST_DEBUG (GST_CAT_PADS, "getcapsfunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (getcaps));
}
/**
* 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",
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",
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, "default pad_push handler in place, no chain function");
g_warning ("(internal error) default pad_push in place for pad %s:%s but it has no chain function",
GST_DEBUG_PAD_NAME (pad));
}
}
/**
* 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) == realsrc);
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;
/* reset the filters, both filters are refcounted once */
if (GST_RPAD_FILTER (realsrc)) {
gst_caps_unref (GST_RPAD_FILTER (realsrc));
GST_RPAD_FILTER (realsink) = NULL;
GST_RPAD_FILTER (realsrc) = NULL;
}
/* now tell the scheduler */
if (GST_PAD_PARENT (realsrc)->sched)
gst_scheduler_pad_disconnect (GST_PAD_PARENT (realsrc)->sched, (GstPad *)realsrc, (GstPad *)realsink);
else if (GST_PAD_PARENT (realsink)->sched)
gst_scheduler_pad_disconnect (GST_PAD_PARENT (realsink)->sched, (GstPad *)realsrc, (GstPad *)realsink);
/* hold a reference, as they can go away in the signal handlers */
gst_object_ref (GST_OBJECT (realsrc));
gst_object_ref (GST_OBJECT (realsink));
/* 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);
GST_INFO (GST_CAT_ELEMENT_PADS, "disconnected %s:%s and %s:%s",
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
gst_object_unref (GST_OBJECT (realsrc));
gst_object_unref (GST_OBJECT (realsink));
}
/**
* gst_pad_can_connect_filtered:
* @srcpad: the source pad to connect
* @sinkpad: the sink pad to connect
* @filtercaps: the filter caps.
*
* Checks if the source pad and the sink pad can be connected.
* The filter indicates the media type that should flow trought this connection.
*
* Returns: TRUE if the pad can be connected, FALSE otherwise
*/
gboolean
gst_pad_can_connect_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps *filtercaps)
{
gint num_decoupled = 0;
GstRealPad *realsrc, *realsink;
/* 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);
/* now we need to deal with the real/ghost stuff */
realsrc = GST_PAD_REALIZE (srcpad);
realsink = GST_PAD_REALIZE (sinkpad);
g_return_val_if_fail (GST_RPAD_PEER (realsrc) == NULL, FALSE);
g_return_val_if_fail (GST_RPAD_PEER (realsink) == NULL, FALSE);
g_return_val_if_fail (GST_PAD_PARENT (realsrc) != NULL, FALSE);
g_return_val_if_fail (GST_PAD_PARENT (realsink) != NULL, FALSE);
if (realsrc->sched && realsink->sched) {
if (GST_FLAG_IS_SET (GST_PAD_PARENT (realsrc), GST_ELEMENT_DECOUPLED))
num_decoupled++;
if (GST_FLAG_IS_SET (GST_PAD_PARENT (realsink), GST_ELEMENT_DECOUPLED))
num_decoupled++;
if (realsrc->sched != realsink->sched && num_decoupled != 1) {
g_warning ("connecting pads with different scheds requires exactly one decoupled element (queue)");
return FALSE;
}
}
/* check if the directions are compatible */
if (!(((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SINK) &&
(GST_RPAD_DIRECTION (realsink) == GST_PAD_SRC)) ||
((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SRC) &&
(GST_RPAD_DIRECTION (realsink) == GST_PAD_SINK))))
{
return FALSE;
}
return TRUE;
}
/**
* gst_pad_can_connect:
* @srcpad: the source pad to connect
* @sinkpad: the sink pad to connect
*
* Checks if the source pad can be connected to the sink pad.
*
* Returns: TRUE if the pads can be connected, FALSE otherwise
*/
gboolean
gst_pad_can_connect (GstPad *srcpad, GstPad *sinkpad)
{
return gst_pad_can_connect_filtered (srcpad, sinkpad, NULL);
}
/**
* gst_pad_connect_filtered:
* @srcpad: the source pad to connect
* @sinkpad: the sink pad to connect
* @filtercaps: the filter caps.
*
* Connects the source pad to the sink pad. The filter indicates the media type
* that should flow trought this connection.
*
* Returns: TRUE if the pad could be connected, FALSE otherwise
*/
gboolean
gst_pad_connect_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps *filtercaps)
{
GstRealPad *realsrc, *realsink;
gint num_decoupled = 0;
/* 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);
g_return_val_if_fail (GST_PAD_PARENT (realsrc) != NULL, FALSE);
g_return_val_if_fail (GST_PAD_PARENT (realsink) != NULL, FALSE);
if (realsrc->sched && realsink->sched) {
if (GST_FLAG_IS_SET (GST_PAD_PARENT (realsrc), GST_ELEMENT_DECOUPLED))
num_decoupled++;
if (GST_FLAG_IS_SET (GST_PAD_PARENT (realsink), GST_ELEMENT_DECOUPLED))
num_decoupled++;
if (realsrc->sched != realsink->sched && num_decoupled != 1) {
g_warning ("connecting pads with different scheds requires exactly one decoupled element (queue)\n");
return 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;
/* try to negotiate the pads, we don't need to clear the caps here */
if (!gst_pad_try_reconnect_filtered_func (realsrc, realsink, filtercaps, FALSE)) {
GST_DEBUG (GST_CAT_CAPS, "pads cannot connect");
GST_RPAD_PEER (realsrc) = NULL;
GST_RPAD_PEER (realsink) = NULL;
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));
gst_caps_debug (gst_pad_get_caps (GST_PAD_CAST (realsrc)), "caps of newly connected src pad");
return TRUE;
}
/**
* gst_pad_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, FALSE otherwise
*/
gboolean
gst_pad_connect (GstPad *srcpad, GstPad *sinkpad)
{
return gst_pad_connect_filtered (srcpad, sinkpad, NULL);
}
/**
* 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_pad_template:
* @pad: the pad to get the padtemplate from
*
* Get the padtemplate object of this pad.
*
* Returns: the padtemplate object
*/
GstPadTemplate*
gst_pad_get_pad_template (GstPad *pad)
{
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
return GST_PAD_PAD_TEMPLATE (pad);
}
/**
* gst_pad_set_scheduler:
* @pad: the pad to set the scheduler for
* @sched: The scheduler to set
*
* Set the scheduler for the pad
*/
void
gst_pad_set_scheduler (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_scheduler:
* @pad: the pad to get the scheduler from
*
* Get the scheduler of the pad
*
* Returns: the scheduler of the pad.
*/
GstScheduler*
gst_pad_get_scheduler (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_unset_scheduler:
* @pad: the pad to unset the scheduler for
*
* Unset the scheduler for the pad
*/
void
gst_pad_unset_scheduler (GstPad *pad)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
GST_RPAD_SCHED(pad) = NULL;
}
/**
* 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;
}
/* an internal caps negotiation helper function does:
*
* 1. optinally calls the pad connect function with the provided caps
* 2. deal with the result code of the connect function
* 3. set fixed caps on the pad.
*/
static GstPadConnectReturn
gst_pad_try_set_caps_func (GstRealPad *pad, GstCaps *caps, gboolean notify)
{
GstCaps *oldcaps;
GstPadTemplate *template;
GstElement *parent = GST_PAD_PARENT (pad);
/* thomas: FIXME: is this the right result to return ? */
g_return_val_if_fail (pad != NULL, GST_PAD_CONNECT_REFUSED);
g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_CONNECT_REFUSED);
/* if this pad has a parent and the parent is not READY, delay the
* negotiation */
if (parent && GST_STATE (parent) < GST_STATE_READY)
{
GST_DEBUG (GST_CAT_CAPS, "parent %s of pad %s:%s is not ready",
GST_ELEMENT_NAME (parent), GST_DEBUG_PAD_NAME (pad));
return GST_PAD_CONNECT_DELAYED;
}
GST_INFO (GST_CAT_CAPS, "trying to set caps %p on pad %s:%s",
caps, GST_DEBUG_PAD_NAME (pad));
if ((template = gst_pad_get_pad_template (GST_PAD_CAST (pad)))) {
if (!gst_caps_intersect (caps, gst_pad_template_get_caps (template))) {
GST_INFO (GST_CAT_CAPS, "caps did not intersect with %s:%s's padtemplate",
GST_DEBUG_PAD_NAME (pad));
gst_caps_debug (caps, "caps themselves (attemped to set)");
gst_caps_debug (gst_pad_template_get_caps (template),
"pad template caps that did not agree with caps");
return GST_PAD_CONNECT_REFUSED;
}
/* given that the caps are fixed, we know that their intersection with the
* padtemplate caps is the same as caps itself */
}
/* we need to notify the connect function */
if (notify && GST_RPAD_CONNECTFUNC (pad)) {
GstPadConnectReturn res;
gchar *debug_string;
GST_INFO (GST_CAT_CAPS, "calling connect function on pad %s:%s",
GST_DEBUG_PAD_NAME (pad));
/* call the connect function */
res = GST_RPAD_CONNECTFUNC (pad) (GST_PAD (pad), caps);
switch (res) {
case GST_PAD_CONNECT_REFUSED:
debug_string = "REFUSED";
break;
case GST_PAD_CONNECT_OK:
debug_string = "OK";
break;
case GST_PAD_CONNECT_DONE:
debug_string = "DONE";
break;
case GST_PAD_CONNECT_DELAYED:
debug_string = "DELAYED";
break;
default:
g_warning ("unknown return code from connect function of pad %s:%s %d",
GST_DEBUG_PAD_NAME (pad), res);
return GST_PAD_CONNECT_REFUSED;
}
GST_INFO (GST_CAT_CAPS, "got reply %s (%d) from connect function on pad %s:%s",
debug_string, res, GST_DEBUG_PAD_NAME (pad));
/* done means the connect function called another caps negotiate function
* on this pad that succeeded, we dont need to continue */
if (res == GST_PAD_CONNECT_DONE) {
GST_INFO (GST_CAT_CAPS, "pad %s:%s is done", GST_DEBUG_PAD_NAME (pad));
return GST_PAD_CONNECT_DONE;
}
if (res == GST_PAD_CONNECT_REFUSED) {
GST_INFO (GST_CAT_CAPS, "pad %s:%s doesn't accept caps",
GST_DEBUG_PAD_NAME (pad));
return GST_PAD_CONNECT_REFUSED;
}
}
/* we can only set caps on the pad if they are fixed */
if (GST_CAPS_IS_FIXED (caps)) {
GST_INFO (GST_CAT_CAPS, "setting caps on pad %s:%s",
GST_DEBUG_PAD_NAME (pad));
/* if we got this far all is ok, remove the old caps, set the new one */
oldcaps = GST_PAD_CAPS (pad);
if (caps) gst_caps_ref (caps);
GST_PAD_CAPS (pad) = caps;
if (oldcaps) gst_caps_unref (oldcaps);
}
else {
GST_INFO (GST_CAT_CAPS, "caps are not fixed on pad %s:%s, not setting them yet",
GST_DEBUG_PAD_NAME (pad));
}
return GST_PAD_CONNECT_OK;
}
/**
* gst_pad_try_set_caps:
* @pad: the pad to try to set the caps on
* @caps: the caps to set
*
* Try to set the caps on the given pad.
*
* Returns: TRUE if the caps could be set
*/
gboolean
gst_pad_try_set_caps (GstPad *pad, GstCaps *caps)
{
GstRealPad *peer, *realpad;
realpad = GST_PAD_REALIZE (pad);
peer = GST_RPAD_PEER (realpad);
GST_INFO (GST_CAT_CAPS, "trying to set caps %p on pad %s:%s",
caps, GST_DEBUG_PAD_NAME (realpad));
gst_caps_debug (caps, "caps that we are trying to set");
/* setting non fixed caps on a pad is not allowed */
if (!GST_CAPS_IS_FIXED (caps)) {
GST_INFO (GST_CAT_CAPS, "trying to set unfixed caps on pad %s:%s, not allowed",
GST_DEBUG_PAD_NAME (realpad));
g_warning ("trying to set non fixed caps on pad %s:%s, not allowed",
GST_DEBUG_PAD_NAME (realpad));
gst_caps_debug (caps, "unfixed caps");
return FALSE;
}
/* if we have a peer try to set the caps, notifying the peerpad
* if it has a connect function */
if (peer && (gst_pad_try_set_caps_func (peer, caps, TRUE) != GST_PAD_CONNECT_OK))
{
GST_INFO (GST_CAT_CAPS, "tried to set caps on peerpad %s:%s but couldn't",
GST_DEBUG_PAD_NAME (peer));
return FALSE;
}
/* then try to set our own caps, we don't need to be notified */
if (gst_pad_try_set_caps_func (realpad, caps, FALSE) != GST_PAD_CONNECT_OK)
{
GST_INFO (GST_CAT_CAPS, "tried to set own caps on pad %s:%s but couldn't",
GST_DEBUG_PAD_NAME (realpad));
return FALSE;
}
GST_INFO (GST_CAT_CAPS, "succeeded setting caps %p on pad %s:%s",
caps, GST_DEBUG_PAD_NAME (realpad));
g_assert (GST_PAD_CAPS (pad));
return TRUE;
}
/* this is a caps negotiation convenience routine, it performs:
*
* 1. optionally clear any pad caps
* 2. calculate the intersection between the two pad tamplate/getcaps caps
* 3. calculate the intersection with the (optional) filtercaps.
* 4. store the intersection in the pad filter
* 5. store the app filtercaps in the pad appfilter.
* 6. start the caps negotiation.
*/
static gboolean
gst_pad_try_reconnect_filtered_func (GstRealPad *srcpad, GstRealPad *sinkpad, GstCaps *filtercaps, gboolean clear)
{
GstCaps *srccaps, *sinkcaps;
GstCaps *intersection = NULL;
GstRealPad *realsrc, *realsink;
realsrc = GST_PAD_REALIZE (srcpad);
realsink = GST_PAD_REALIZE (sinkpad);
g_return_val_if_fail (GST_RPAD_PEER (realsrc) != NULL, FALSE);
g_return_val_if_fail (GST_RPAD_PEER (realsink) == realsrc, FALSE);
/* optinally clear the caps */
if (clear) {
GST_INFO (GST_CAT_PADS, "reconnect filtered %s:%s and %s:%s, clearing caps",
GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink));
GST_PAD_CAPS (GST_PAD (realsrc)) = NULL;
GST_PAD_CAPS (GST_PAD (realsink)) = NULL;
}
else {
GST_INFO (GST_CAT_PADS, "reconnect filtered %s:%s and %s:%s",
GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink));
}
srccaps = gst_pad_get_caps (GST_PAD (realsrc));
GST_DEBUG (GST_CAT_PADS, "dumping caps of pad %s:%s", GST_DEBUG_PAD_NAME (realsrc));
gst_caps_debug (srccaps, "caps of src pad (pre-reconnect)");
sinkcaps = gst_pad_get_caps (GST_PAD (realsink));
GST_DEBUG (GST_CAT_PADS, "dumping caps of pad %s:%s", GST_DEBUG_PAD_NAME (realsink));
gst_caps_debug (sinkcaps, "caps of sink pad (pre-reconnect)");
/* first take the intersection of the pad caps */
intersection = gst_caps_intersect (srccaps, sinkcaps);
/* if we have no intersection but one of the caps was not NULL.. */
if (!intersection && (srccaps || sinkcaps)) {
/* the intersection is NULL but the pad caps were not both NULL,
* this means they have no common format */
GST_INFO (GST_CAT_PADS, "pads %s:%s and %s:%s have no common type",
GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink));
return FALSE;
} else if (intersection) {
GST_INFO (GST_CAT_PADS, "pads %s:%s and %s:%s intersected to %s caps",
GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink),
((intersection && GST_CAPS_IS_FIXED (intersection)) ? "fixed" : "variable"));
/* then filter this against the app filter */
if (filtercaps) {
GstCaps *filtered_intersection = gst_caps_intersect (intersection, filtercaps);
/* get rid of the old intersection here */
gst_caps_unref (intersection);
if (!filtered_intersection) {
GST_INFO (GST_CAT_PADS, "filtered connection between pads %s:%s and %s:%s is empty",
GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink));
return FALSE;
}
intersection = filtered_intersection;
/* keep a reference to the app caps */
GST_RPAD_APPFILTER (realsink) = filtercaps;
GST_RPAD_APPFILTER (realsrc) = filtercaps;
}
}
GST_DEBUG (GST_CAT_CAPS, "setting filter for connection to:");
gst_caps_debug (intersection, "filter for connection");
/* both the app filter and the filter, while stored on both peer pads, are the
equal to the same thing on both */
GST_RPAD_FILTER (realsrc) = intersection;
GST_RPAD_FILTER (realsink) = intersection;
return gst_pad_perform_negotiate (GST_PAD (realsrc), GST_PAD (realsink));
}
/**
* gst_pad_perform_negotiate:
* @srcpad: a srcpad
* @sinkpad: a sinkpad
*
* Try to negotiate the pads.
*
* Returns: a boolean indicating the pad succesfully negotiated.
*/
gboolean
gst_pad_perform_negotiate (GstPad *srcpad, GstPad *sinkpad)
{
GstCaps *intersection, *filtered_intersection;
GstRealPad *realsrc, *realsink;
GstCaps *srccaps, *sinkcaps, *filter;
g_return_val_if_fail (srcpad != NULL, FALSE);
g_return_val_if_fail (sinkpad != NULL, FALSE);
realsrc = GST_PAD_REALIZE (srcpad);
realsink = GST_PAD_REALIZE (sinkpad);
g_return_val_if_fail (GST_RPAD_PEER (realsrc) != NULL, FALSE);
g_return_val_if_fail (GST_RPAD_PEER (realsink) == realsrc, FALSE);
filter = GST_RPAD_APPFILTER (realsrc);
if (filter) {
GST_INFO (GST_CAT_PADS, "dumping filter for connection %s:%s-%s:%s",
GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink));
gst_caps_debug (filter, "connection filter caps");
}
/* calculate the new caps here */
srccaps = gst_pad_get_caps (GST_PAD (realsrc));
GST_DEBUG (GST_CAT_PADS, "dumping caps of pad %s:%s", GST_DEBUG_PAD_NAME (realsrc));
gst_caps_debug (srccaps, "src caps, awaiting negotiation, after applying filter");
sinkcaps = gst_pad_get_caps (GST_PAD (realsink));
GST_DEBUG (GST_CAT_PADS, "dumping caps of pad %s:%s", GST_DEBUG_PAD_NAME (realsink));
gst_caps_debug (sinkcaps, "sink caps, awaiting negotiation, after applying filter");
intersection = gst_caps_intersect (srccaps, sinkcaps);
filtered_intersection = gst_caps_intersect (intersection, filter);
if (filtered_intersection) {
gst_caps_unref (intersection);
intersection = filtered_intersection;
}
/* no negotiation is performed if the pads have filtercaps */
if (intersection) {
GstPadConnectReturn res;
res = gst_pad_try_set_caps_func (realsrc, intersection, TRUE);
if (res == GST_PAD_CONNECT_REFUSED)
return FALSE;
if (res == GST_PAD_CONNECT_DONE)
return TRUE;
res = gst_pad_try_set_caps_func (realsink, intersection, TRUE);
if (res == GST_PAD_CONNECT_REFUSED)
return FALSE;
if (res == GST_PAD_CONNECT_DONE)
return TRUE;
}
return TRUE;
}
/**
* gst_pad_try_reconnect_filtered:
* @srcpad: the source"pad to reconnect
* @sinkpad: the sink pad to reconnect
* @filtercaps: the capabilities to use in the reconnectiong
*
* Try to reconnect this pad and its peer with the specified caps
*
* Returns: a boolean indicating the peer pad could accept the caps.
*/
gboolean
gst_pad_try_reconnect_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps *filtercaps)
{
GstRealPad *realsrc, *realsink;
g_return_val_if_fail (srcpad != NULL, FALSE);
g_return_val_if_fail (sinkpad != NULL, FALSE);
realsrc = GST_PAD_REALIZE (srcpad);
realsink = GST_PAD_REALIZE (sinkpad);
g_return_val_if_fail (GST_RPAD_PEER (realsrc) != NULL, FALSE);
g_return_val_if_fail (GST_RPAD_PEER (realsink) == realsrc, FALSE);
return gst_pad_try_reconnect_filtered_func (realsrc, realsink, filtercaps, TRUE);
}
/**
* gst_pad_reconnect_filtered:
* @srcpad: the source"pad to reconnect
* @sinkpad: the sink pad to reconnect
* @filtercaps: the capabilities to use in the reconnectiong
*
* Try to reconnect this pad and its peer with the specified caps.
*
* Returns: a boolean indicating the peer pad could accept the caps.
* if FALSE is returned, the pads are disconnected.
*/
gboolean
gst_pad_reconnect_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps *filtercaps)
{
GstRealPad *realsrc, *realsink;
g_return_val_if_fail (srcpad != NULL, FALSE);
g_return_val_if_fail (sinkpad != NULL, FALSE);
realsrc = GST_PAD_REALIZE (srcpad);
realsink = GST_PAD_REALIZE (sinkpad);
g_return_val_if_fail (GST_RPAD_PEER (realsrc) != NULL, FALSE);
g_return_val_if_fail (GST_RPAD_PEER (realsink) == realsrc, FALSE);
if (!gst_pad_try_reconnect_filtered_func (realsrc, realsink, filtercaps, TRUE)) {
gst_pad_disconnect (srcpad, GST_PAD (GST_PAD_PEER (srcpad)));
return FALSE;
}
return TRUE;
}
/**
* gst_pad_proxy_connect:
* @pad: the pad to proxy to
* @caps: the capabilities to use in the proxying
*
* Proxy the connect function to the specified pad.
*
* Returns: a boolean indicating the peer pad could accept the caps.
*/
GstPadConnectReturn
gst_pad_proxy_connect (GstPad *pad, GstCaps *caps)
{
GstRealPad *peer, *realpad;
realpad = GST_PAD_REALIZE (pad);
peer = GST_RPAD_PEER (realpad);
GST_INFO (GST_CAT_CAPS, "proxy connect to pad %s:%s",
GST_DEBUG_PAD_NAME (realpad));
if (peer && gst_pad_try_set_caps_func (peer, caps, TRUE) < 0)
return GST_PAD_CONNECT_REFUSED;
if (gst_pad_try_set_caps_func (realpad, caps, FALSE) < 0)
return GST_PAD_CONNECT_REFUSED;
return GST_PAD_CONNECT_OK;
}
/**
* 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)
{
GstRealPad *realpad;
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
realpad = GST_PAD_REALIZE (pad);
GST_DEBUG (GST_CAT_CAPS, "get pad caps of %s:%s (%p)",
GST_DEBUG_PAD_NAME (realpad), realpad);
if (GST_PAD_CAPS (realpad)) {
GST_DEBUG (GST_CAT_CAPS, "using pad real caps");
return GST_PAD_CAPS (realpad);
}
else if GST_RPAD_GETCAPSFUNC (realpad) {
GST_DEBUG (GST_CAT_CAPS, "using pad get function");
return GST_RPAD_GETCAPSFUNC (realpad) (GST_PAD_CAST (realpad), NULL);
}
else if (GST_PAD_PAD_TEMPLATE (realpad)) {
GST_DEBUG (GST_CAT_CAPS, "using pad template");
return GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (realpad));
}
GST_DEBUG (GST_CAT_CAPS, "pad has no caps");
return NULL;
}
/**
* gst_pad_get_pad_template_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_pad_template_caps (GstPad *pad)
{
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
if (GST_PAD_PAD_TEMPLATE (pad))
return GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (pad));
return NULL;
}
/**
* gst_pad_template_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_pad_template_get_caps_by_name (GstPadTemplate *templ, const gchar *name)
{
GstCaps *caps;
g_return_val_if_fail (templ != NULL, NULL);
caps = GST_PAD_TEMPLATE_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",
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_allowed_caps:
* @pad: the pad to get the allowed caps from
*
* Get the caps of the allowed media types that can
* go through this pad.
*
* Returns: the allowed caps, newly allocated
*/
GstCaps*
gst_pad_get_allowed_caps (GstPad *pad)
{
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
GST_DEBUG (GST_CAT_PROPERTIES, "get allowed caps of %s:%s", GST_DEBUG_PAD_NAME (pad));
return gst_caps_copy (GST_RPAD_FILTER (pad));
}
/**
* gst_pad_recalc_allowed_caps:
* @pad: the pad to recaculate the caps of
*
* Attempt to reconnect the pad to its peer through its filter,
* set with gst_pad_[re]connect_filtered. This function is useful when a
* plugin has new capabilities on a pad and wants to notify the peer.
*
* Returns: TRUE on success, FALSE otherwise.
*/
gboolean
gst_pad_recalc_allowed_caps (GstPad *pad)
{
GstRealPad *peer;
g_return_val_if_fail (pad != NULL, FALSE);
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
GST_DEBUG (GST_CAT_PROPERTIES, "set allowed caps of %s:%s", GST_DEBUG_PAD_NAME (pad));
peer = GST_RPAD_PEER (pad);
if (peer)
return gst_pad_try_reconnect_filtered (pad, GST_PAD (peer), GST_RPAD_APPFILTER (pad));
return TRUE;
}
/**
* 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);
if (!peer)
return 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",
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",
GST_DEBUG_PAD_NAME (((GstPad*) peer)), &peer->bufferpoolfunc);
return NULL;
}
}
static void
gst_real_pad_dispose (GObject *object)
{
GstPad *pad = GST_PAD (object);
/* No connected pad can ever be disposed.
* It has to have a parent to be connected and a parent would hold a reference */
g_assert (GST_PAD_PEER (pad) == NULL);
GST_DEBUG (GST_CAT_REFCOUNTING, "dispose %s:%s", GST_DEBUG_PAD_NAME(pad));
if (GST_PAD_PAD_TEMPLATE (pad)){
GST_DEBUG (GST_CAT_REFCOUNTING, "unreffing padtemplate'%s'", GST_OBJECT_NAME (GST_PAD_PAD_TEMPLATE (pad)));
gst_object_unref (GST_OBJECT (GST_PAD_PAD_TEMPLATE (pad)));
GST_PAD_PAD_TEMPLATE (pad) = NULL;
}
/* we 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'",
GST_OBJECT_NAME (GST_OBJECT_PARENT (ghostpad)));
gst_element_remove_ghost_pad (GST_ELEMENT (GST_OBJECT_PARENT (ghostpad)), GST_PAD (ghostpad));
}
ghostpads = g_list_next (ghostpads);
}
g_list_free (orig);
g_list_free (GST_REAL_PAD(pad)->ghostpads);
}
if (GST_IS_ELEMENT (GST_OBJECT_PARENT (pad))){
GST_DEBUG (GST_CAT_REFCOUNTING, "removing pad from element '%s'",
GST_OBJECT_NAME (GST_OBJECT (GST_ELEMENT (GST_OBJECT_PARENT (pad)))));
gst_element_remove_pad (GST_ELEMENT (GST_OBJECT_PARENT (pad)), pad);
}
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);
}
/**
* 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);
if (!peer) {
g_warning ("push on pad %s:%s but it is unconnected", GST_DEBUG_PAD_NAME (pad));
}
else {
if (peer->chainhandler) {
if (buf) {
GST_DEBUG (GST_CAT_DATAFLOW, "calling chainhandler &%s of peer pad %s:%s",
GST_DEBUG_FUNCPTR_NAME (peer->chainhandler), GST_DEBUG_PAD_NAME (GST_PAD (peer)));
(peer->chainhandler) (GST_PAD_CAST (peer), buf);
return;
}
else {
g_warning ("trying to push a NULL buffer on pad %s:%s", GST_DEBUG_PAD_NAME (peer));
return;
}
}
else {
g_warning ("(internal error) push on pad %s:%s but it has no chainhandler", GST_DEBUG_PAD_NAME (peer));
}
}
/* clean up the mess here */
if (buf != NULL) {
if (GST_IS_BUFFER (buf))
gst_buffer_unref (buf);
else
gst_event_free (GST_EVENT (buf));
}
}
#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;
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) {
gst_element_error (GST_PAD_PARENT (pad),
"pull on pad %s:%s but it was unconnected",
GST_ELEMENT_NAME (GST_PAD_PARENT (pad)), GST_PAD_NAME (pad),
NULL);
}
else {
if (peer->gethandler) {
GstBuffer *buf;
GST_DEBUG (GST_CAT_DATAFLOW, "calling gethandler %s of peer pad %s:%s",
GST_DEBUG_FUNCPTR_NAME (peer->gethandler), GST_DEBUG_PAD_NAME (peer));
buf = (peer->gethandler) (GST_PAD_CAST (peer));
if (buf)
return buf;
/* no null buffers allowed */
gst_element_error (GST_PAD_PARENT (pad),
"NULL buffer during pull on %s:%s", GST_DEBUG_PAD_NAME (pad), NULL);
} else {
gst_element_error (GST_PAD_PARENT (pad),
"(internal error) pull on pad %s:%s but the peer pad %s:%s has no gethandler",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_PAD_NAME (peer),
NULL);
}
}
return NULL;
}
#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_PARENT (padlist->data)->sched, 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_pad_template_class_init (GstPadTemplateClass *klass);
static void gst_pad_template_init (GstPadTemplate *templ);
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),
32,
(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__POINTER, G_TYPE_NONE, 1,
G_TYPE_POINTER);
gstobject_class->path_string_separator = "*";
}
static void
gst_pad_template_init (GstPadTemplate *templ)
{
}
/* ALWAYS padtemplates cannot have conversion specifications, 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_pad_template_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_pad_template_new (const 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);
if (!name_is_valid (name_template, presence))
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;
va_start (var_args, caps);
while (caps) {
new->fixed &= caps->fixed;
thecaps = gst_caps_append (thecaps, caps);
caps = va_arg (var_args, GstCaps*);
}
va_end (var_args);
GST_PAD_TEMPLATE_CAPS (new) = thecaps;
return new;
}
/**
* gst_pad_template_get_caps:
* @templ: the padtemplate to use
*
* Get the capabilities of the padtemplate
*
* Returns: a GstCaps*
*/
GstCaps*
gst_pad_template_get_caps (GstPadTemplate *templ)
{
g_return_val_if_fail (templ != NULL, NULL);
return GST_PAD_TEMPLATE_CAPS (templ);
}
/**
* 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;
GstRealPad *realpad;
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);
realpad = (GstRealPad *) pad;
while (!GST_IS_REAL_PAD (realpad)) {
realpad = GST_PAD_REALIZE (realpad);
}
GST_GPAD_REALPAD (ghostpad) = realpad;
GST_PAD_PAD_TEMPLATE (ghostpad) = GST_PAD_PAD_TEMPLATE (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\"", name);
return GST_PAD (ghostpad);
}
/**
* gst_pad_get_internal_connections_default:
* @pad: the pad to get the internal connections of
*
* Get a GList of pads that this pad is connected to internally
* to the parent element.
*
* Returns: a GList of pads, g_list_free after use.
*/
GList*
gst_pad_get_internal_connections_default (GstPad *pad)
{
GList *res = NULL;
GstElement *parent;
GList *parent_pads;
GstPadDirection direction;
GstRealPad *rpad;
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
rpad = GST_PAD_REALIZE (pad);
direction = rpad->direction;
parent = GST_PAD_PARENT (rpad);
parent_pads = parent->pads;
while (parent_pads) {
GstRealPad *parent_pad = GST_PAD_REALIZE (parent_pads->data);
if (parent_pad->direction != direction) {
res = g_list_prepend (res, parent_pad);
}
parent_pads = g_list_next (parent_pads);
}
return res;
}
/**
* gst_pad_get_internal_connections:
* @pad: the pad to get the internal connections of
*
* Get a GList of pads that this pad is connected to internally
* to the parent element.
*
* Returns: a GList of pads, g_list_free after use.
*/
GList*
gst_pad_get_internal_connections (GstPad *pad)
{
GList *res = NULL;
GstRealPad *rpad;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
rpad = GST_PAD_REALIZE (pad);
if (GST_RPAD_INTCONNFUNC (rpad))
res = GST_RPAD_INTCONNFUNC (rpad) (GST_PAD_CAST (rpad));
return res;
}
static gboolean
gst_pad_event_default_dispatch (GstPad *pad, GstElement *element, GstEvent *event)
{
GList *pads = element->pads;
while (pads) {
GstPad *eventpad = GST_PAD (pads->data);
pads = g_list_next (pads);
/* for all pads in the opposite direction that are connected */
if (GST_PAD_DIRECTION (eventpad) != GST_PAD_DIRECTION (pad) && GST_PAD_IS_CONNECTED (eventpad)) {
if (GST_PAD_DIRECTION (eventpad) == GST_PAD_SRC) {
gst_pad_push (eventpad, GST_BUFFER (gst_event_copy (event)));
}
else {
GstPad *peerpad = GST_PAD_CAST (GST_RPAD_PEER (eventpad));
/* we only send the event on one pad, multi-sinkpad elements should implement
* a handler */
return gst_pad_send_event (peerpad, event);
}
}
}
return TRUE;
}
/**
* gst_pad_event_default:
* @pad: the pad to operate on
* @event: the event to handle
*
* Invoke the default event handler for the given pad.
*
* Returns: TRUE if the event was sent succesfully.
*/
gboolean
gst_pad_event_default (GstPad *pad, GstEvent *event)
{
GstElement *element = GST_PAD_PARENT (pad);
g_signal_emit (G_OBJECT (pad), gst_real_pad_signals[REAL_EVENT_RECEIVED], 0, event);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
gst_pad_event_default_dispatch (pad, element, event);
gst_element_set_eos (element);
/* we have to try to schedule another element because this one is disabled */
gst_element_yield (element);
break;
case GST_EVENT_DISCONTINUOUS:
{
guint64 time;
if (gst_event_discont_get_value (event, GST_FORMAT_TIME, &time)) {
if (element->setclockfunc && element->clock) {
gst_clock_handle_discont (element->clock, time);
}
}
}
case GST_EVENT_FLUSH:
default:
return gst_pad_event_default_dispatch (pad, element, event);
}
return TRUE;
}
/**
* gst_pad_dispatcher:
* @pad: the pad to dispatch
* @dispatch: the GstDispatcherFunc to call
* @data: data passed to the dispatcher function.
*
* Invoke the given dispatcher function on all internally connected
* pads of the given pad. The GstPadDispatcherFunc should return
* TRUE when no further pads need to be preocessed.
*
* Returns: TRUE if one of the dispatcher functions returned TRUE.
*/
gboolean
gst_pad_dispatcher (GstPad *pad, GstPadDispatcherFunc dispatch, gpointer data)
{
gboolean res = FALSE;
GList *int_pads, *orig;
g_return_val_if_fail (pad, FALSE);
g_return_val_if_fail (data, FALSE);
orig = int_pads = gst_pad_get_internal_connections (pad);
while (int_pads) {
GstRealPad *int_rpad = GST_PAD_REALIZE (int_pads->data);
GstRealPad *int_peer = GST_RPAD_PEER (int_rpad);
if (int_peer && GST_PAD_IS_CONNECTED (int_peer)) {
res = dispatch (GST_PAD_CAST (int_peer), data);
if (res)
break;
}
int_pads = g_list_next (int_pads);
}
g_list_free (orig);
return res;
}
/**
* 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 success = FALSE;
g_return_val_if_fail (event, FALSE);
if (!pad || (GST_PAD_IS_SINK (pad) && !GST_PAD_IS_CONNECTED (pad)))
return FALSE;
if (GST_EVENT_SRC (event) == NULL)
GST_EVENT_SRC (event) = gst_object_ref (GST_OBJECT (pad));
GST_DEBUG (GST_CAT_EVENT, "have event %d on pad %s:%s",
GST_EVENT_TYPE (event), GST_DEBUG_PAD_NAME (pad));
if (GST_RPAD_EVENTFUNC (pad))
success = GST_RPAD_EVENTFUNC (pad) (pad, event);
else {
GST_DEBUG(GST_CAT_EVENT, "there's no event function for pad %s:%s", GST_DEBUG_PAD_NAME (pad));
}
return success;
}
typedef struct
{
GstFormat src_format;
gint64 src_value;
GstFormat *dest_format;
gint64 *dest_value;
} GstPadConvertData;
static gboolean
gst_pad_convert_dispatcher (GstPad *pad, GstPadConvertData *data)
{
return gst_pad_convert (pad, data->src_format, data->src_value,
data->dest_format, data->dest_value);
}
/**
* gst_pad_convert_default:
* @pad: the pad to invoke the default converter on
* @src_format: the source format
* @src_value: the source value
* @dest_format: a pointer to the destination format
* @dest_value: a pointer to the destination value
*
* Invoke the default converter on a pad. This will forward the
* call to the pad obtained using the internal connection of
* the element.
*
* Returns: TRUE if the conversion could be performed.
*/
gboolean
gst_pad_convert_default (GstPad *pad,
GstFormat src_format, gint64 src_value,
GstFormat *dest_format, gint64 *dest_value)
{
GstPadConvertData data;
g_return_val_if_fail (pad, FALSE);
g_return_val_if_fail (dest_format, FALSE);
g_return_val_if_fail (dest_value, FALSE);
data.src_format = src_format;
data.src_value = src_value;
data.dest_format = dest_format;
data.dest_value = dest_value;
return gst_pad_dispatcher (pad, (GstPadDispatcherFunc) gst_pad_convert_dispatcher, &data);
}
/**
* gst_pad_convert:
* @pad: the pad to invoke the converter on
* @src_format: the source format
* @src_value: the source value
* @dest_format: a pointer to the destination format
* @dest_value: a pointer to the destination value
*
* Invoke a conversion on the pad.
*
* Returns: TRUE if the conversion could be performed.
*/
gboolean
gst_pad_convert (GstPad *pad,
GstFormat src_format, gint64 src_value,
GstFormat *dest_format, gint64 *dest_value)
{
GstRealPad *rpad;
g_return_val_if_fail (pad, FALSE);
g_return_val_if_fail (dest_format, FALSE);
g_return_val_if_fail (dest_value, FALSE);
if (src_format == *dest_format) {
*dest_value = src_value;
return TRUE;
}
rpad = GST_PAD_REALIZE (pad);
g_return_val_if_fail (rpad, FALSE);
if (GST_RPAD_CONVERTFUNC (rpad)) {
return GST_RPAD_CONVERTFUNC (rpad) (GST_PAD_CAST (rpad), src_format, src_value, dest_format, dest_value);
}
return FALSE;
}
typedef struct
{
GstPadQueryType type;
GstFormat *format;
gint64 *value;
} GstPadQueryData;
static gboolean
gst_pad_query_dispatcher (GstPad *pad, GstPadQueryData *data)
{
return gst_pad_query (pad, data->type, data->format, data->value);
}
/**
* gst_pad_query_default:
* @pad: the pad to invoke the default query on
* @type: the type of query to perform
* @format: a pointer to the format of the query
* @value: a pointer to the result of the query
*
* Invoke the default query function on a pad.
*
* Returns: TRUE if the query could be performed.
*/
gboolean
gst_pad_query_default (GstPad *pad, GstPadQueryType type,
GstFormat *format, gint64 *value)
{
GstPadQueryData data;
g_return_val_if_fail (pad, FALSE);
g_return_val_if_fail (format, FALSE);
g_return_val_if_fail (value, FALSE);
data.type = type;
data.format = format;
data.value = value;
return gst_pad_dispatcher (pad, (GstPadDispatcherFunc) gst_pad_query_dispatcher, &data);
}
/**
* gst_pad_query:
* @pad: the pad to invoke the query on
* @type: the type of query to perform
* @format: a pointer to the format of the query
* @value: a pointer to the result of the query
*
* Query a pad for one of the available GstPadQuery properties.
*
* Returns: TRUE if the query could be performed.
*/
gboolean
gst_pad_query (GstPad *pad, GstPadQueryType type,
GstFormat *format, gint64 *value)
{
GstRealPad *rpad;
if (pad == NULL)
return FALSE;
g_return_val_if_fail (format, FALSE);
g_return_val_if_fail (value, FALSE);
rpad = GST_PAD_REALIZE (pad);
g_return_val_if_fail (rpad, FALSE);
if (GST_RPAD_QUERYFUNC (rpad))
return GST_RPAD_QUERYFUNC (rpad) (GST_PAD_CAST (pad), type, format, value);
return FALSE;
}
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