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gstreamer/gst/gstpad.c
Thomas Vander Stichele 4efc300279 changing error signal add error codes and domains 
Original commit message from CVS:
changing error signal
add error codes and domains
2004-01-18 21:36:20 +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 linking 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.
*/
#include "gst_private.h"
#include "gstpad.h"
#include "gstutils.h"
#include "gstelement.h"
#include "gstbin.h"
#include "gstscheduler.h"
#include "gstevent.h"
#include "gstinfo.h"
#include "gsterror.h"
#include "gstvalue.h"
#define GST_CAT_DEFAULT GST_CAT_PADS
/* FIXME */
#define gst_caps_debug(a,b) GST_DEBUG_CAPS(b,a)
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 void gst_pad_dispose (GObject *object);
static void gst_pad_set_pad_template (GstPad *pad, GstPadTemplate *templ);
static GstCaps * _gst_pad_default_fixate_func (GstPad *pad, const GstCaps *caps);
static gboolean gst_pad_link_try (GstPadLink *link);
static void gst_pad_link_free (GstPadLink *link);
#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)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass*) klass;
pad_parent_class = g_type_class_ref (GST_TYPE_OBJECT);
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_pad_dispose);
}
static void
gst_pad_init (GstPad *pad)
{
/* all structs are initialized to NULL by glib */
}
static void
gst_pad_dispose (GObject *object)
{
GstPad *pad = GST_PAD (object);
gst_pad_set_pad_template (pad, NULL);
G_OBJECT_CLASS (pad_parent_class)->dispose (object);
}
/***** Then do the Real Pad *****/
/* Pad signals and args */
enum {
REAL_CAPS_NEGO_FAILED,
REAL_LINKED,
REAL_UNLINKED,
REAL_FIXATE,
/* FILL ME */
REAL_LAST_SIGNAL
};
enum {
REAL_ARG_0,
REAL_ARG_CAPS,
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_dispose (GObject *object);
static gboolean _gst_real_pad_fixate_accumulator (GSignalInvocationHint *ihint,
GValue *return_accu, const GValue *handler_return, gpointer dummy);
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);
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_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_LINKED] =
g_signal_new ("linked", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstRealPadClass, linked), NULL, NULL,
gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1,
GST_TYPE_PAD);
gst_real_pad_signals[REAL_UNLINKED] =
g_signal_new ("unlinked", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstRealPadClass, unlinked), NULL, NULL,
gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1,
GST_TYPE_PAD);
gst_real_pad_signals[REAL_FIXATE] =
g_signal_new ("fixate", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstRealPadClass, appfixatefunc),
_gst_real_pad_fixate_accumulator, NULL,
gst_marshal_POINTER__POINTER, G_TYPE_POINTER, 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));
g_object_class_install_property (G_OBJECT_CLASS (klass), REAL_ARG_CAPS,
g_param_spec_boxed ("caps", "Caps", "The capabilities of the pad",
GST_TYPE_CAPS, G_PARAM_READABLE));
#ifndef GST_DISABLE_LOADSAVE
gstobject_class->save_thyself = GST_DEBUG_FUNCPTR (gst_pad_save_thyself);
#endif
gstobject_class->path_string_separator = ".";
}
static gboolean
_gst_real_pad_fixate_accumulator (GSignalInvocationHint *ihint,
GValue *return_accu, const GValue *handler_return, gpointer dummy)
{
if (g_value_get_pointer (handler_return)) {
g_value_copy (handler_return, return_accu);
/* stop emission if something was returned */
return FALSE;
}
return TRUE;
}
static void
gst_real_pad_init (GstRealPad *pad)
{
pad->direction = GST_PAD_UNKNOWN;
pad->peer = NULL;
pad->chainfunc = NULL;
pad->getfunc = NULL;
pad->chainhandler = NULL;
pad->gethandler = NULL;
pad->ghostpads = NULL;
pad->caps = NULL;
pad->linkfunc = NULL;
pad->getcapsfunc = NULL;
pad->eventfunc = gst_pad_event_default;
pad->convertfunc = gst_pad_convert_default;
pad->queryfunc = gst_pad_query_default;
pad->intlinkfunc = gst_pad_get_internal_links_default;
pad->eventmaskfunc = gst_pad_get_event_masks_default;
pad->formatsfunc = gst_pad_get_formats_default;
pad->querytypefunc = gst_pad_get_query_types_default;
GST_FLAG_SET (pad, GST_PAD_DISABLED);
GST_FLAG_UNSET (pad, GST_PAD_NEGOTIATING);
gst_probe_dispatcher_init (&pad->probedisp);
}
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:
gst_pad_set_active (GST_PAD (object), g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_real_pad_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec)
{
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;
case REAL_ARG_CAPS:
g_value_set_boxed (value, GST_PAD_CAPS (GST_REAL_PAD (object)));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/**
* gst_pad_custom_new:
* @type: the #Gtype of the pad.
* @name: the name of the new pad.
* @direction: the #GstPadDirection of the pad.
*
* Creates a new pad with the given name and type in the given direction.
* If name is NULL, a guaranteed unique name (across all pads)
* will be assigned.
*
* Returns: a new #GstPad, or NULL in case of an error.
*/
GstPad*
gst_pad_custom_new (GType type, const gchar *name,
GstPadDirection direction)
{
GstRealPad *pad;
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: the name of the new pad.
* @direction: the #GstPadDirection of the pad.
*
* Creates a new real pad with the given name in the given direction.
* If name is NULL, a guaranteed unique name (across all pads)
* will be assigned.
*
* Returns: a new #GstPad, or NULL in case of an error.
*/
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 of the pad.
* @templ: the #GstPadTemplate to instantiate from.
* @name: the name of the new pad.
*
* Creates a new custom pad with the given name from the given template.
* If name is NULL, a guaranteed unique name (across all pads)
* will be assigned.
*
* Returns: a new #GstPad, or NULL in case of an error.
*/
GstPad*
gst_pad_custom_new_from_template (GType type, GstPadTemplate *templ,
const gchar *name)
{
GstPad *pad;
g_return_val_if_fail (templ != NULL, NULL);
pad = gst_pad_new (name, templ->direction);
gst_pad_set_pad_template (pad, templ);
return pad;
}
/**
* gst_pad_new_from_template:
* @templ: the pad template to use
* @name: the name of the element
*
* Creates a new real pad with the given name from the given template.
* If name is NULL, a guaranteed unique name (across all pads)
* will be assigned.
*
* Returns: a new #GstPad, or NULL in case of an error.
*/
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: a #GstPad to get the direction of.
*
* Gets the direction of the pad.
*
* Returns: the #GstPadDirection of the pad.
*/
GstPadDirection
gst_pad_get_direction (GstPad *pad)
{
g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_UNKNOWN);
return GST_PAD_DIRECTION (pad);
}
/**
* gst_pad_set_active:
* @pad: the #GstPad to activate or deactivate.
* @active: TRUE to activate the pad.
*
* Activates or deactivates the given pad.
*/
void
gst_pad_set_active (GstPad *pad, gboolean active)
{
GstRealPad *realpad;
gboolean old;
g_return_if_fail (GST_IS_PAD (pad));
old = GST_PAD_IS_ACTIVE (pad);
if (old == active)
return;
realpad = GST_PAD_REALIZE (pad);
if (active) {
GST_CAT_DEBUG (GST_CAT_PADS, "activating pad %s:%s",
GST_DEBUG_PAD_NAME (realpad));
GST_FLAG_UNSET (realpad, GST_PAD_DISABLED);
} else {
GST_CAT_DEBUG (GST_CAT_PADS, "de-activating pad %s:%s",
GST_DEBUG_PAD_NAME (realpad));
GST_FLAG_SET (realpad, GST_PAD_DISABLED);
}
g_object_notify (G_OBJECT (realpad), "active");
}
/**
* gst_pad_is_active:
* @pad: the #GstPad to query
*
* Query if a pad is active
*
* Returns: TRUE if the pad is active.
*/
gboolean
gst_pad_is_active (GstPad *pad)
{
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
return !GST_FLAG_IS_SET (pad, GST_PAD_DISABLED);
}
/**
* gst_pad_set_name:
* @pad: a #GstPad to set the name of.
* @name: the name of the pad.
*
* Sets the name of a pad. If name is NULL, then a guaranteed unique
* name will be assigned.
*/
void
gst_pad_set_name (GstPad *pad, const gchar *name)
{
g_return_if_fail (GST_IS_PAD (pad));
gst_object_set_name (GST_OBJECT (pad), name);
}
/**
* gst_pad_get_name:
* @pad: a #GstPad to get the name of.
*
* Gets the name of a pad.
*
* Returns: the name of the pad. This is not a newly allocated pointer
* so you must not free it.
*/
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: a #GstPad to set the chain function for.
* @chain: the #GstPadChainFunction to set.
*
* Sets 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));
g_return_if_fail (GST_RPAD_DIRECTION (pad) == GST_PAD_SINK);
GST_RPAD_CHAINFUNC (pad) = chain;
GST_CAT_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: a #GstPad to set the get function for.
* @get: the #GstPadGetFunction to set.
*
* Sets 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));
g_return_if_fail (GST_RPAD_DIRECTION (pad) == GST_PAD_SRC);
GST_RPAD_GETFUNC (pad) = get;
GST_CAT_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: a #GstPad to set the event handler for.
* @event: the #GstPadEventFunction to set.
*
* Sets the given event handler for the pad.
*/
void
gst_pad_set_event_function (GstPad *pad,
GstPadEventFunction event)
{
g_return_if_fail (GST_IS_REAL_PAD (pad));
g_return_if_fail (GST_RPAD_DIRECTION (pad) == GST_PAD_SRC);
GST_RPAD_EVENTFUNC (pad) = event;
GST_CAT_DEBUG (GST_CAT_PADS, "eventfunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (event));
}
/**
* gst_pad_set_event_mask_function:
* @pad: a #GstPad to set the event mask function for.
* @mask_func: the #GstPadEventMaskFunction to set.
*
* Sets the given event mask function for the pad.
*/
void
gst_pad_set_event_mask_function (GstPad *pad,
GstPadEventMaskFunction mask_func)
{
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_EVENTMASKFUNC (pad) = mask_func;
GST_CAT_DEBUG (GST_CAT_PADS, "eventmaskfunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (mask_func));
}
/**
* gst_pad_get_event_masks:
* @pad: a #GstPad to get the event mask for.
*
* Gets the array of eventmasks from the given pad.
*
* Returns: an array with eventmasks, the list is ended
* with 0
*/
const GstEventMask*
gst_pad_get_event_masks (GstPad *pad)
{
GstRealPad *rpad;
if (pad == NULL)
return FALSE;
rpad = GST_PAD_REALIZE (pad);
g_return_val_if_fail (rpad, FALSE);
if (GST_RPAD_EVENTMASKFUNC (rpad))
return GST_RPAD_EVENTMASKFUNC (rpad) (GST_PAD (pad));
return NULL;
}
static gboolean
gst_pad_get_event_masks_dispatcher (GstPad *pad, const GstEventMask **data)
{
*data = gst_pad_get_event_masks (pad);
return TRUE;
}
/**
* gst_pad_get_event_masks_default:
* @pad: a #GstPad to get the event mask for.
*
* Invokes the default event masks dispatcher on the pad.
*
* Returns: an array with eventmasks, the list is ended
* with 0
*/
const GstEventMask*
gst_pad_get_event_masks_default (GstPad *pad)
{
GstEventMask *result = NULL;
gst_pad_dispatcher (pad, (GstPadDispatcherFunction)
gst_pad_get_event_masks_dispatcher, &result);
return result;
}
/**
* gst_pad_set_convert_function:
* @pad: a #GstPad to set the convert function for.
* @convert: the #GstPadConvertFunction to set.
*
* Sets 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_CAT_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 #GstPad to set the query function for.
* @query: the #GstPadQueryFunction to set.
*
* 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_CAT_DEBUG (GST_CAT_PADS, "queryfunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (query));
}
/**
* gst_pad_set_query_type_function:
* @pad: the #GstPad to set the query type function for.
* @type_func: the #GstPadQueryTypeFunction to set.
*
* Set the given query type function for the pad.
*/
void
gst_pad_set_query_type_function (GstPad *pad, GstPadQueryTypeFunction type_func)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_QUERYTYPEFUNC (pad) = type_func;
GST_CAT_DEBUG (GST_CAT_PADS, "querytypefunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (type_func));
}
/**
* gst_pad_get_query_types:
* @pad: the #GstPad to query
*
* Get an array of supported queries that can be performed
* on this pad.
*
* Returns: an array of querytypes anded with 0.
*/
const GstQueryType*
gst_pad_get_query_types (GstPad *pad)
{
GstRealPad *rpad;
if (pad == NULL)
return FALSE;
rpad = GST_PAD_REALIZE (pad);
g_return_val_if_fail (rpad, FALSE);
if (GST_RPAD_QUERYTYPEFUNC (rpad))
return GST_RPAD_QUERYTYPEFUNC (rpad) (GST_PAD (pad));
return NULL;
}
static gboolean
gst_pad_get_query_types_dispatcher (GstPad *pad, const GstQueryType **data)
{
*data = gst_pad_get_query_types (pad);
return TRUE;
}
/**
* gst_pad_get_query_types_default:
* @pad: the #GstPad to query
*
* Invoke the default dispatcher for the query types on
* the pad.
*
* Returns: an array of querytypes anded with 0.
*/
const GstQueryType*
gst_pad_get_query_types_default (GstPad *pad)
{
GstQueryType *result = NULL;
gst_pad_dispatcher (pad, (GstPadDispatcherFunction)
gst_pad_get_query_types_dispatcher, &result);
return result;
}
/**
* gst_pad_set_internal_link_function:
* @pad: a #GstPad to set the internal link function for.
* @intlink: the #GstPadIntLinkFunction to set.
*
* Sets the given internal link function for the pad.
*/
void
gst_pad_set_internal_link_function (GstPad *pad,
GstPadIntLinkFunction intlink)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_INTLINKFUNC (pad) = intlink;
GST_CAT_DEBUG (GST_CAT_PADS, "internal link for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (intlink));
}
/**
* gst_pad_set_formats_function:
* @pad: the #GstPad to set the formats function for.
* @formats: the #GstPadFormatsFunction to set.
*
* Sets the given formats function for the pad.
*/
void
gst_pad_set_formats_function (GstPad *pad, GstPadFormatsFunction formats)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_FORMATSFUNC (pad) = formats;
GST_CAT_DEBUG (GST_CAT_PADS, "formats function for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (formats));
}
/**
* gst_pad_set_link_function:
* @pad: a #GstPad to set the link function for.
* @link: the #GstPadLinkFunction to set.
*
* Sets the given link function for the pad. It will be called
* when the pad is linked or relinked with caps.
*/
void
gst_pad_set_link_function (GstPad *pad,
GstPadLinkFunction link)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_LINKFUNC (pad) = link;
GST_CAT_DEBUG (GST_CAT_PADS, "linkfunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (link));
}
/**
* gst_pad_set_unlink_function:
* @pad: a #GstPad to set the unlink function for.
* @unlink: the #GstPadUnlinkFunction to set.
*
* Sets the given unlink function for the pad. It will be called
* when the pad is unlinked.
*/
void
gst_pad_set_unlink_function (GstPad *pad,
GstPadUnlinkFunction unlink)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_UNLINKFUNC (pad) = unlink;
GST_CAT_DEBUG (GST_CAT_PADS, "unlinkfunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (unlink));
}
/**
* gst_pad_set_fixate_function:
* @pad: a #GstPad to set the fixate function for.
* @getcaps: the #GstPadFixateFunction to set.
*
* Sets the given fixate function for the pad.
*/
void
gst_pad_set_fixate_function (GstPad *pad, GstPadFixateFunction fixate)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_FIXATEFUNC (pad) = fixate;
GST_CAT_DEBUG (GST_CAT_PADS, "fixatefunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (fixate));
}
/**
* gst_pad_set_getcaps_function:
* @pad: a #GstPad to set the getcaps function for.
* @getcaps: the #GstPadGetCapsFunction to set.
*
* Sets 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_CAT_DEBUG (GST_CAT_PADS, "getcapsfunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (getcaps));
}
/**
* gst_pad_set_bufferalloc_function:
* @pad: a #GstPad to set the bufferalloc function for.
* @bufalloc: the #GstPadBufferAllocFunction to set.
*
* Sets the given bufferalloc function for the pad. Note that the
* bufferalloc function can only be set on sinkpads.
*/
void
gst_pad_set_bufferalloc_function (GstPad *pad,
GstPadBufferAllocFunction bufalloc)
{
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_REAL_PAD (pad));
g_return_if_fail (GST_PAD_IS_SINK (pad));
GST_RPAD_BUFFERALLOCFUNC (pad) = bufalloc;
GST_CAT_DEBUG (GST_CAT_PADS, "bufferallocfunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (bufalloc));
}
/**
* gst_pad_unlink:
* @srcpad: the source #GstPad to unlink.
* @sinkpad: the sink #GstPad to unlink.
*
* Unlinks the source pad from the sink pad.
*/
void
gst_pad_unlink (GstPad *srcpad,
GstPad *sinkpad)
{
GstRealPad *realsrc, *realsink;
GstScheduler *src_sched, *sink_sched;
/* 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_CAT_INFO (GST_CAT_ELEMENT_PADS, "unlinking %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));
if (GST_RPAD_UNLINKFUNC (realsrc)) {
GST_RPAD_UNLINKFUNC (realsrc) (GST_PAD (realsrc));
}
if (GST_RPAD_UNLINKFUNC (realsink)) {
GST_RPAD_UNLINKFUNC (realsink) (GST_PAD (realsink));
}
/* get the schedulers before we unlink */
src_sched = gst_pad_get_scheduler (GST_PAD (realsrc));
sink_sched = gst_pad_get_scheduler (GST_PAD (realsink));
if (GST_RPAD_LINK (realsrc)) gst_pad_link_free (GST_RPAD_LINK (realsrc));
/* first clear peers */
GST_RPAD_PEER (realsrc) = NULL;
GST_RPAD_PEER (realsink) = NULL;
GST_RPAD_LINK (realsrc) = NULL;
GST_RPAD_LINK (realsink) = NULL;
/* now tell the scheduler */
if (src_sched && src_sched == sink_sched) {
gst_scheduler_pad_unlink (src_sched,
GST_PAD (realsrc),
GST_PAD (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 unlinked */
g_signal_emit (G_OBJECT (realsrc), gst_real_pad_signals[REAL_UNLINKED],
0, realsink);
g_signal_emit (G_OBJECT (realsink), gst_real_pad_signals[REAL_UNLINKED],
0, realsrc);
GST_CAT_INFO (GST_CAT_ELEMENT_PADS, "unlinked %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_is_linked:
* @pad: pad to check
*
* Checks if a given pad is linked to another pad or not.
*
* Returns: TRUE if the pad is linked.
*/
gboolean
gst_pad_is_linked (GstPad *pad)
{
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
return GST_PAD_PEER (pad) != NULL;
}
struct _GstPadLink {
GType type;
gboolean bla;
gboolean srcnotify;
gboolean sinknotify;
GstPad *srcpad;
GstPad *sinkpad;
GstCaps *srccaps;
GstCaps *sinkcaps;
GstCaps *filtercaps;
GstCaps *caps;
GstPadFixateFunction app_fixate;
};
static gboolean
gst_pad_check_schedulers (GstRealPad *realsrc, GstRealPad *realsink)
{
GstScheduler *src_sched, *sink_sched;
gint num_decoupled = 0;
src_sched = gst_pad_get_scheduler (GST_PAD (realsrc));
sink_sched = gst_pad_get_scheduler (GST_PAD (realsink));
if (src_sched && sink_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 (src_sched != sink_sched && num_decoupled != 1) {
return FALSE;
}
}
return TRUE;
}
#define GST_PAD_LINK_SRC(pad) ((GST_PAD_IS_SRC (pad)) ? (pad) : GST_PAD_PEER (pad))
#define GST_PAD_LINK_SINK(pad) ((GST_PAD_IS_SINK (pad)) ? (pad) : GST_PAD_PEER (pad))
static GstPadLink *
gst_pad_link_new (void)
{
GstPadLink *link;
link = g_new0 (GstPadLink, 1);
link->sinknotify = TRUE;
link->srcnotify = TRUE;
return link;
}
static void
gst_pad_link_free (GstPadLink *link)
{
if (link->srccaps) gst_caps_free (link->srccaps);
if (link->sinkcaps) gst_caps_free (link->sinkcaps);
if (link->filtercaps) gst_caps_free (link->filtercaps);
if (link->caps) gst_caps_free (link->caps);
#ifdef USE_POISONING
memset(link,0xff, sizeof(*link));
#endif
g_free (link);
}
static void gst_pad_link_intersect (GstPadLink *link)
{
GstCaps *pad_intersection;
if (link->caps) gst_caps_free (link->caps);
GST_DEBUG ("intersecting link from %s:%s to %s:%s",
GST_DEBUG_PAD_NAME (link->srcpad), GST_DEBUG_PAD_NAME (link->sinkpad));
GST_DEBUG_CAPS ("srccaps", link->srccaps);
GST_DEBUG_CAPS ("sinkcaps", link->sinkcaps);
GST_DEBUG_CAPS ("filtercaps", link->filtercaps);
pad_intersection = gst_caps_intersect (link->srccaps, link->sinkcaps);
if (link->filtercaps) {
GST_DEBUG_CAPS ("unfiltered intersection", pad_intersection);
link->caps = gst_caps_intersect (pad_intersection, link->filtercaps);
gst_caps_free (pad_intersection);
} else {
link->caps = pad_intersection;
}
GST_DEBUG_CAPS ("intersection", link->caps);
}
static gboolean
gst_pad_link_ready_for_negotiation (GstPadLink *link)
{
GstElement *parent;
parent = GST_PAD_PARENT (link->srcpad);
if (!parent || GST_STATE (parent) < GST_STATE_READY) {
GST_DEBUG ("parent %s of pad %s:%s is not READY",
GST_ELEMENT_NAME (parent), GST_DEBUG_PAD_NAME (link->srcpad));
return FALSE;
}
parent = GST_PAD_PARENT (link->sinkpad);
if (!parent || GST_STATE (parent) < GST_STATE_READY) {
GST_DEBUG ("parent %s of pad %s:%s is not READY",
GST_ELEMENT_NAME (parent), GST_DEBUG_PAD_NAME (link->sinkpad));
return FALSE;
}
return TRUE;
}
static void
gst_pad_link_fixate (GstPadLink *link)
{
GstCaps *caps;
GstCaps *newcaps;
caps = link->caps;
g_return_if_fail (caps != NULL);
g_return_if_fail (!gst_caps_is_empty(caps));
GST_DEBUG_CAPS ("trying to fixate caps", caps);
while (!gst_caps_is_fixed (caps)) {
int i;
for (i=0;i<5;i++){
newcaps = NULL;
switch (i) {
case 0:
g_signal_emit (G_OBJECT (link->srcpad),
gst_real_pad_signals[REAL_FIXATE], 0, caps, &newcaps);
GST_DEBUG_CAPS ("app srcpad signal fixated to", newcaps);
break;
case 1:
g_signal_emit (G_OBJECT (link->sinkpad),
gst_real_pad_signals[REAL_FIXATE], 0, caps, &newcaps);
GST_DEBUG_CAPS ("app sinkpad signal fixated to", newcaps);
break;
case 2:
if (GST_RPAD_FIXATEFUNC(link->srcpad)) {
newcaps = GST_RPAD_FIXATEFUNC(link->srcpad) (
GST_PAD (link->srcpad), caps);
GST_DEBUG_CAPS ("srcpad fixated to", newcaps);
}
break;
case 3:
if (GST_RPAD_FIXATEFUNC(link->sinkpad)) {
newcaps = GST_RPAD_FIXATEFUNC(link->sinkpad) (
GST_PAD (link->sinkpad), caps);
GST_DEBUG_CAPS ("sinkpad fixated to", newcaps);
}
break;
case 4:
newcaps = _gst_pad_default_fixate_func (
GST_PAD(link->srcpad), caps);
GST_DEBUG_CAPS ("core fixated to", newcaps);
break;
}
if (newcaps) {
gst_caps_free (caps);
caps = newcaps;
break;
}
}
}
link->caps = caps;
}
static GstPadLinkReturn
gst_pad_link_call_link_functions (GstPadLink *link)
{
gboolean negotiating;
GstPadLinkReturn res;
if (link->srcnotify && GST_RPAD_LINKFUNC (link->srcpad)){
GST_DEBUG ("calling link function on pad %s:%s",
GST_DEBUG_PAD_NAME (link->srcpad));
negotiating = GST_FLAG_IS_SET (link->srcpad, GST_PAD_NEGOTIATING);
/* set the NEGOTIATING flag if not already done */
if (!negotiating) GST_FLAG_SET (link->srcpad, GST_PAD_NEGOTIATING);
/* call the link function */
res = GST_RPAD_LINKFUNC (link->srcpad) (GST_PAD (link->srcpad),
link->caps);
/* unset again after negotiating only if we set it */
if (!negotiating) GST_FLAG_UNSET (link->srcpad, GST_PAD_NEGOTIATING);
GST_DEBUG ("got reply %d from link function on pad %s:%s",
res, GST_DEBUG_PAD_NAME (link->srcpad));
if (GST_PAD_LINK_FAILED (res)) {
GST_CAT_INFO (GST_CAT_CAPS, "pad %s:%s doesn't accept caps",
GST_DEBUG_PAD_NAME (link->srcpad));
return res;
}
}
if (link->sinknotify && GST_RPAD_LINKFUNC (link->sinkpad)){
GST_DEBUG ("calling link function on pad %s:%s",
GST_DEBUG_PAD_NAME (link->sinkpad));
negotiating = GST_FLAG_IS_SET (link->sinkpad, GST_PAD_NEGOTIATING);
/* set the NEGOTIATING flag if not already done */
if (!negotiating) GST_FLAG_SET (link->sinkpad, GST_PAD_NEGOTIATING);
/* call the link function */
res = GST_RPAD_LINKFUNC (link->sinkpad) (GST_PAD (link->sinkpad),
link->caps);
/* unset again after negotiating only if we set it */
if (!negotiating) GST_FLAG_UNSET (link->sinkpad, GST_PAD_NEGOTIATING);
GST_DEBUG ("got reply %d from link function on pad %s:%s",
res, GST_DEBUG_PAD_NAME (link->sinkpad));
if (GST_PAD_LINK_FAILED (res)) {
GST_CAT_INFO (GST_CAT_CAPS, "pad %s:%s doesn't accept caps",
GST_DEBUG_PAD_NAME (link->sinkpad));
return res;
}
}
return GST_PAD_LINK_OK;
}
static GstPadLinkReturn
gst_pad_link_negotiate (GstPadLink *link)
{
GST_DEBUG ("negotiating link from pad %s:%s to pad %s:%s",
GST_DEBUG_PAD_NAME (link->srcpad), GST_DEBUG_PAD_NAME (link->sinkpad));
if (!gst_pad_link_ready_for_negotiation (link)) {
return GST_PAD_LINK_DELAYED;
}
gst_pad_link_intersect (link);
if (gst_caps_is_empty (link->caps))
return GST_PAD_LINK_REFUSED;
gst_pad_link_fixate (link);
if (gst_caps_is_empty (link->caps))
return GST_PAD_LINK_REFUSED;
return gst_pad_link_call_link_functions (link);
}
/**
* gst_pad_link_try:
* @link: link to try
*
* Tries to (re)link the pads with the given link. The function takes ownership
* of the supplied link. If the function returns FALSE and an old link existed,
* that link can be assumed to work unchanged.
*
* Returns: TRUE if the link succeeded, FALSE if not.
*/
static gboolean
gst_pad_link_try (GstPadLink *link)
{
GstPad *srcpad, *sinkpad;
GstPadLink *oldlink;
GstPadLinkReturn ret;
/* we use assertions here, because this function is static */
g_assert (link);
srcpad = link->srcpad;
g_assert (srcpad);
sinkpad = link->sinkpad;
g_assert (sinkpad);
oldlink = GST_RPAD_LINK (srcpad);
g_assert (oldlink == GST_RPAD_LINK (sinkpad));
ret = gst_pad_link_negotiate (link);
if (GST_PAD_LINK_FAILED (ret) && oldlink && oldlink->caps) {
oldlink->srcnotify = link->srcnotify;
oldlink->sinknotify = link->sinknotify;
if (GST_PAD_LINK_FAILED (gst_pad_link_call_link_functions (oldlink))) {
g_warning ("pads don't accept old caps. We assume they did though");
}
}
if (ret == GST_PAD_LINK_REFUSED) {
gst_pad_link_free (link);
return ret;
}
if (ret == GST_PAD_LINK_DELAYED) {
gst_caps_replace (&link->caps, NULL);
}
GST_RPAD_PEER (srcpad) = GST_REAL_PAD(link->sinkpad);
GST_RPAD_PEER (sinkpad) = GST_REAL_PAD(link->srcpad);
if (oldlink)
gst_pad_link_free (oldlink);
GST_RPAD_LINK (srcpad) = link;
GST_RPAD_LINK (sinkpad) = link;
if (ret == GST_PAD_LINK_OK) {
g_object_notify (G_OBJECT (srcpad), "caps");
g_object_notify (G_OBJECT (sinkpad), "caps");
}
return ret;
}
GstPadLinkReturn
gst_pad_renegotiate (GstPad *pad)
{
GstPadLink *link;
g_return_val_if_fail (pad != NULL, GST_PAD_LINK_REFUSED);
g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_LINK_REFUSED);
g_return_val_if_fail (GST_PAD_LINK_SRC (pad), GST_PAD_LINK_REFUSED);
g_return_val_if_fail (GST_PAD_LINK_SINK (pad), GST_PAD_LINK_REFUSED);
link = gst_pad_link_new ();
link->srcpad = GST_PAD_LINK_SRC (pad);
link->sinkpad = GST_PAD_LINK_SINK (pad);
if (!gst_pad_link_ready_for_negotiation (link)) {
gst_pad_link_free (link);
return GST_PAD_LINK_DELAYED;
}
if (GST_REAL_PAD(pad)->link->filtercaps) {
link->filtercaps = gst_caps_copy (GST_REAL_PAD(pad)->link->filtercaps);
}
link->srccaps = gst_pad_get_caps (link->srcpad);
link->sinkcaps = gst_pad_get_caps (link->sinkpad);
return gst_pad_link_try (link);
}
GstPadLinkReturn
gst_pad_try_set_caps (GstPad *pad, const GstCaps *caps)
{
GstPadLink *link;
GstPadLink *oldlink;
GstPadLinkReturn ret;
g_return_val_if_fail (pad != NULL, GST_PAD_LINK_REFUSED);
g_return_val_if_fail (GST_IS_REAL_PAD (pad), GST_PAD_LINK_REFUSED);
g_return_val_if_fail (!GST_FLAG_IS_SET (pad, GST_PAD_NEGOTIATING),
GST_PAD_LINK_REFUSED);
/* setting non-fixed caps on a pad is not allowed */
if (!gst_caps_is_fixed (caps)) {
GST_CAT_INFO (GST_CAT_CAPS,
"trying to set unfixed caps on pad %s:%s, not allowed",
GST_DEBUG_PAD_NAME (pad));
g_warning ("trying to set non fixed caps on pad %s:%s, not allowed",
GST_DEBUG_PAD_NAME (pad));
gst_caps_debug (caps, "unfixed caps");
return GST_PAD_LINK_REFUSED;
}
/* we allow setting caps on non-linked pads. It's ignored */
if (!GST_PAD_PEER (pad)) {
return GST_PAD_LINK_OK;
}
/* if the desired caps are already there, it's trivially ok */
if (GST_PAD_CAPS (pad) && gst_caps_is_equal_fixed (caps,
GST_PAD_CAPS (pad))) {
return GST_PAD_LINK_OK;
}
g_return_val_if_fail (GST_PAD_LINK_SRC (pad), GST_PAD_LINK_REFUSED);
g_return_val_if_fail (GST_PAD_LINK_SINK (pad), GST_PAD_LINK_REFUSED);
link = gst_pad_link_new ();
link->srcpad = GST_PAD_LINK_SRC (pad);
link->sinkpad = GST_PAD_LINK_SINK (pad);
if (!gst_pad_link_ready_for_negotiation (link)) {
gst_pad_link_free (link);
return GST_PAD_LINK_DELAYED;
}
oldlink = GST_REAL_PAD(pad)->link;
if (oldlink && oldlink->filtercaps) {
link->filtercaps = gst_caps_copy (oldlink->filtercaps);
}
if (link->srcpad == pad) {
link->srccaps = gst_caps_copy(caps);
link->sinkcaps = gst_pad_get_caps (link->sinkpad);
link->srcnotify = FALSE;
} else {
link->srccaps = gst_pad_get_caps (link->srcpad);
link->sinkcaps = gst_caps_copy(caps);
link->sinknotify = FALSE;
}
ret = gst_pad_link_try (link);
return ret;
}
/**
* gst_pad_can_link_filtered:
* @srcpad: the source #GstPad to link.
* @sinkpad: the sink #GstPad to link.
* @filtercaps: the filter #GstCaps.
*
* Checks if the source pad and the sink pad can be linked when constrained
* by the given filter caps.
*
* Returns: TRUE if the pads can be linked, FALSE otherwise.
*/
gboolean
gst_pad_can_link_filtered (GstPad *srcpad, GstPad *sinkpad,
const GstCaps *filtercaps)
{
GstRealPad *realsrc, *realsink;
GstPadLink *link;
/* FIXME This function is gross. It's almost a direct copy of
* gst_pad_link_filtered(). Any decent programmer would attempt
* to merge the two functions, which I will do some day. --ds
*/
/* 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_CAT_INFO (GST_CAT_PADS, "trying to link %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_CAT_INFO (GST_CAT_PADS, "*actually* linking %s:%s and %s:%s",
GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink));
}
/* FIXME: shouldn't we convert this to g_return_val_if_fail? */
if (GST_RPAD_PEER (realsrc) != NULL) {
GST_CAT_INFO (GST_CAT_PADS, "Real source pad %s:%s has a peer, failed",
GST_DEBUG_PAD_NAME (realsrc));
return FALSE;
}
if (GST_RPAD_PEER (realsink) != NULL) {
GST_CAT_INFO (GST_CAT_PADS, "Real sink pad %s:%s has a peer, failed",
GST_DEBUG_PAD_NAME (realsink));
return FALSE;
}
if (GST_PAD_PARENT (realsrc) == NULL) {
GST_CAT_INFO (GST_CAT_PADS, "Real src pad %s:%s has no parent, failed",
GST_DEBUG_PAD_NAME (realsrc));
return FALSE;
}
if (GST_PAD_PARENT (realsink) == NULL) {
GST_CAT_INFO (GST_CAT_PADS, "Real sink pad %s:%s has no parent, failed",
GST_DEBUG_PAD_NAME (realsrc));
return FALSE;
}
if (!gst_pad_check_schedulers (realsrc, realsink)) {
g_warning ("linking pads with different scheds requires "
"exactly one decoupled element (such as queue)");
return FALSE;
}
g_return_val_if_fail (realsrc != NULL, GST_PAD_LINK_REFUSED);
g_return_val_if_fail (realsink != NULL, GST_PAD_LINK_REFUSED);
link = gst_pad_link_new ();
if (GST_RPAD_DIRECTION (realsrc) == GST_PAD_SRC) {
link->srcpad = GST_PAD (realsrc);
link->sinkpad = GST_PAD (realsink);
} else {
link->srcpad = GST_PAD (realsink);
link->sinkpad = GST_PAD (realsrc);
}
if (GST_RPAD_DIRECTION (link->srcpad) != GST_PAD_SRC) {
GST_CAT_INFO (GST_CAT_PADS, "Real src pad %s:%s is not a source pad, failed",
GST_DEBUG_PAD_NAME (link->srcpad));
gst_pad_link_free (link);
return FALSE;
}
if (GST_RPAD_DIRECTION (link->sinkpad) != GST_PAD_SINK) {
GST_CAT_INFO (GST_CAT_PADS, "Real sink pad %s:%s is not a sink pad, failed",
GST_DEBUG_PAD_NAME (link->sinkpad));
gst_pad_link_free (link);
return FALSE;
}
link->srccaps = gst_pad_get_caps (link->srcpad);
link->sinkcaps = gst_pad_get_caps (link->sinkpad);
if (filtercaps) link->filtercaps = gst_caps_copy (filtercaps);
gst_pad_link_intersect (link);
if (gst_caps_is_empty (link->caps))
return FALSE;
return TRUE;
}
/**
* gst_pad_can_link:
* @srcpad: the source #GstPad to link.
* @sinkpad: the sink #GstPad to link.
*
* Checks if the source pad and the sink pad can be link.
*
* Returns: TRUE if the pads can be linked, FALSE otherwise.
*/
gboolean
gst_pad_can_link (GstPad *srcpad, GstPad *sinkpad)
{
return gst_pad_can_link_filtered (srcpad, sinkpad, NULL);
}
/**
* gst_pad_link_filtered:
* @srcpad: the source #GstPad to link.
* @sinkpad: the sink #GstPad to link.
* @filtercaps: the filter #GstCaps.
*
* Links the source pad and the sink pad, constrained
* by the given filter caps. This function sinks the caps.
*
* Returns: TRUE if the pads have been linked, FALSE otherwise.
*/
gboolean
gst_pad_link_filtered (GstPad *srcpad, GstPad *sinkpad,
const GstCaps *filtercaps)
{
GstRealPad *realsrc, *realsink;
GstScheduler *src_sched, *sink_sched;
GstPadLink *link;
/* 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_CAT_INFO (GST_CAT_PADS, "trying to link %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_CAT_INFO (GST_CAT_PADS, "*actually* linking %s:%s and %s:%s",
GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink));
}
/* FIXME: shouldn't we convert this to g_return_val_if_fail? */
if (GST_RPAD_PEER (realsrc) != NULL) {
GST_CAT_INFO (GST_CAT_PADS, "Real source pad %s:%s has a peer, failed",
GST_DEBUG_PAD_NAME (realsrc));
return FALSE;
}
if (GST_RPAD_PEER (realsink) != NULL) {
GST_CAT_INFO (GST_CAT_PADS, "Real sink pad %s:%s has a peer, failed",
GST_DEBUG_PAD_NAME (realsink));
return FALSE;
}
if (GST_PAD_PARENT (realsrc) == NULL) {
GST_CAT_INFO (GST_CAT_PADS, "Real src pad %s:%s has no parent, failed",
GST_DEBUG_PAD_NAME (realsrc));
return FALSE;
}
if (GST_PAD_PARENT (realsink) == NULL) {
GST_CAT_INFO (GST_CAT_PADS, "Real sink pad %s:%s has no parent, failed",
GST_DEBUG_PAD_NAME (realsrc));
return FALSE;
}
if (!gst_pad_check_schedulers (realsrc, realsink)) {
g_warning ("linking pads with different scheds requires "
"exactly one decoupled element (such as queue)");
return FALSE;
}
g_return_val_if_fail (realsrc != NULL, GST_PAD_LINK_REFUSED);
g_return_val_if_fail (realsink != NULL, GST_PAD_LINK_REFUSED);
link = gst_pad_link_new ();
if (GST_RPAD_DIRECTION (realsrc) == GST_PAD_SRC) {
link->srcpad = GST_PAD (realsrc);
link->sinkpad = GST_PAD (realsink);
} else {
link->srcpad = GST_PAD (realsink);
link->sinkpad = GST_PAD (realsrc);
}
if (GST_RPAD_DIRECTION (link->srcpad) != GST_PAD_SRC) {
GST_CAT_INFO (GST_CAT_PADS, "Real src pad %s:%s is not a source pad, failed",
GST_DEBUG_PAD_NAME (link->srcpad));
gst_pad_link_free (link);
return FALSE;
}
if (GST_RPAD_DIRECTION (link->sinkpad) != GST_PAD_SINK) {
GST_CAT_INFO (GST_CAT_PADS, "Real sink pad %s:%s is not a sink pad, failed",
GST_DEBUG_PAD_NAME (link->sinkpad));
gst_pad_link_free (link);
return FALSE;
}
link->srccaps = gst_pad_get_caps (link->srcpad);
link->sinkcaps = gst_pad_get_caps (link->sinkpad);
if (filtercaps) link->filtercaps = gst_caps_copy (filtercaps);
if (gst_pad_link_try (link) == GST_PAD_LINK_REFUSED)
return FALSE;
/* fire off a signal to each of the pads telling them
* that they've been linked */
g_signal_emit (G_OBJECT (link->srcpad), gst_real_pad_signals[REAL_LINKED],
0, link->sinkpad);
g_signal_emit (G_OBJECT (link->sinkpad), gst_real_pad_signals[REAL_LINKED],
0, link->srcpad);
src_sched = gst_pad_get_scheduler (GST_PAD (link->srcpad));
sink_sched = gst_pad_get_scheduler (GST_PAD (link->sinkpad));
/* now tell the scheduler */
if (src_sched && src_sched == sink_sched) {
gst_scheduler_pad_link (src_sched,
GST_PAD (link->srcpad), GST_PAD (link->sinkpad));
}
else {
GST_CAT_INFO (GST_CAT_PADS, "not telling link to scheduler %s:%s and %s:%s, %p %p",
GST_DEBUG_PAD_NAME (link->srcpad),
GST_DEBUG_PAD_NAME (link->sinkpad),
src_sched, sink_sched);
}
GST_CAT_INFO (GST_CAT_PADS, "linked %s:%s and %s:%s, successful",
GST_DEBUG_PAD_NAME (link->srcpad),
GST_DEBUG_PAD_NAME (link->sinkpad));
return TRUE;
}
/**
* gst_pad_link:
* @srcpad: the source #GstPad to link.
* @sinkpad: the sink #GstPad to link.
*
* Links the source pad to the sink pad.
*
* Returns: TRUE if the pad could be linked, FALSE otherwise.
*/
gboolean
gst_pad_link (GstPad *srcpad, GstPad *sinkpad)
{
return gst_pad_link_filtered (srcpad, sinkpad, NULL);
}
/**
* gst_pad_set_parent:
* @pad: a #GstPad to set the parent of.
* @parent: the new parent #GstElement.
*
* Sets the parent object of a pad.
*/
void
gst_pad_set_parent (GstPad *pad, GstElement *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), GST_OBJECT (parent));
}
/**
* gst_pad_get_parent:
* @pad: the #GstPad to get the parent of.
*
* Gets the parent object of this pad.
*
* Returns: the parent #GstElement.
*/
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);
}
static void
gst_pad_set_pad_template (GstPad *pad, GstPadTemplate *templ)
{
/* this function would need checks if it weren't static */
gst_object_replace ((GstObject **) &pad->padtemplate, (GstObject *) templ);
if (templ)
g_signal_emit (G_OBJECT (templ), gst_pad_template_signals[TEMPL_PAD_CREATED], 0, pad);
}
/**
* gst_pad_get_pad_template:
* @pad: a #GstPad to get the pad template of.
*
* Gets the pad template object of this pad.
*
* Returns: the #GstPadTemplate from which this pad was instantiated.
*/
GstPadTemplate*
gst_pad_get_pad_template (GstPad *pad)
{
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
return GST_PAD_PAD_TEMPLATE (pad);
}
/**
* gst_pad_get_scheduler:
* @pad: a #GstPad to get the scheduler of.
*
* Gets the scheduler of the pad. Since the pad does not
* have a scheduler of its own, the scheduler of the parent
* is taken. For decoupled pads, the scheduler of the peer
* parent is taken.
*
* Returns: the #GstScheduler of the pad.
*/
GstScheduler*
gst_pad_get_scheduler (GstPad *pad)
{
GstScheduler *scheduler = NULL;
GstElement *parent;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
parent = gst_pad_get_parent (pad);
if (parent) {
if (GST_FLAG_IS_SET (parent, GST_ELEMENT_DECOUPLED)) {
GstRealPad *peer = GST_RPAD_PEER (pad);
if (peer) {
scheduler = gst_element_get_scheduler (gst_pad_get_parent (GST_PAD (peer)));
}
}
else {
scheduler = gst_element_get_scheduler (parent);
}
}
return scheduler;
}
/**
* gst_pad_get_real_parent:
* @pad: a #GstPad to get the real parent of.
*
* Gets the real parent object of this pad. If the pad
* is a ghost pad, the actual owner of the real pad is
* returned, as opposed to #gst_pad_get_parent().
*
* Returns: the parent #GstElement.
*/
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: a #GstPad to attach the ghost pad to.
* @ghostpad: the ghost #GstPad to to the pad.
*
* Adds 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: a #GstPad to remove the ghost pad from.
* @ghostpad: the ghost #GstPad to remove from the pad.
*
* Removes a ghost pad from a pad.
*/
void
gst_pad_remove_ghost_pad (GstPad *pad,
GstPad *ghostpad)
{
GstRealPad *realpad;
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (GST_IS_GHOST_PAD (ghostpad));
realpad = GST_PAD_REALIZE (pad);
g_return_if_fail (GST_GPAD_REALPAD (ghostpad) == realpad);
realpad->ghostpads = g_list_remove (realpad->ghostpads, ghostpad);
GST_GPAD_REALPAD (ghostpad) = NULL;
}
/**
* gst_pad_get_ghost_pad_list:
* @pad: a #GstPad to get the ghost pads of.
*
* Gets the ghost pads 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;
}
static gboolean
_gst_pad_default_fixate_foreach (GQuark field_id, GValue *value,
gpointer s)
{
GstStructure *structure = (GstStructure *)s;
GType type = G_VALUE_TYPE (value);
if (G_TYPE_IS_FUNDAMENTAL (type) || type == GST_TYPE_FOURCC) return TRUE;
if (type == GST_TYPE_INT_RANGE) {
gst_structure_set (structure, g_quark_to_string (field_id),
G_TYPE_INT, gst_value_get_int_range_min (value), NULL);
return FALSE;
}
if (type == GST_TYPE_DOUBLE_RANGE) {
gst_structure_set (structure, g_quark_to_string (field_id),
G_TYPE_DOUBLE, gst_value_get_double_range_min (value), NULL);
return FALSE;
}
if (type == GST_TYPE_LIST) {
gst_structure_set_value (structure, g_quark_to_string (field_id),
gst_value_list_get_value (value, 0));
return FALSE;
}
g_critical ("don't know how to fixate type %s", g_type_name(type));
return TRUE;
}
static GstCaps *
_gst_pad_default_fixate_func (GstPad *pad, const GstCaps *caps)
{
static GstStaticCaps octetcaps = GST_STATIC_CAPS (
"application/octet-stream");
GstStructure *structure;
GstCaps *newcaps;
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (caps != NULL, NULL);
g_return_val_if_fail (!gst_caps_is_empty (caps), NULL);
if (gst_caps_is_any (caps)) {
return gst_caps_copy (gst_static_caps_get (&octetcaps));
}
if (caps->structs->len > 1) {
return gst_caps_new_full (gst_caps_get_structure (caps, 0), NULL);
}
newcaps = gst_caps_copy (caps);
structure = gst_caps_get_structure (newcaps, 0);
gst_structure_foreach (structure, _gst_pad_default_fixate_foreach,
structure);
return newcaps;
}
/**
* gst_pad_perform_negotiate:
* @srcpad: the source #GstPad.
* @sinkpad: the sink #GstPad.
*
* Tries to negotiate the pads.
*
* Returns: TRUE if the pads were succesfully negotiated, FALSE otherwise.
*/
gboolean
gst_pad_perform_negotiate (GstPad *srcpad, GstPad *sinkpad)
{
return GST_PAD_LINK_SUCCESSFUL (gst_pad_renegotiate (srcpad));
}
void
gst_pad_link_unnegotiate (GstPadLink *link)
{
g_return_if_fail (link != NULL);
if (link->caps) {
gst_caps_free (link->caps);
link->caps = NULL;
if (GST_RPAD_LINK (link->srcpad) != link) {
g_warning ("unnegotiating unset link");
} else {
g_object_notify (G_OBJECT (link->srcpad), "caps");
}
if (GST_RPAD_LINK (link->sinkpad) != link) {
g_warning ("unnegotiating unset link");
} else {
g_object_notify (G_OBJECT (link->sinkpad), "caps");
}
}
}
/**
* gst_pad_unnegotiate:
* @pad: pad to unnegotiate
*
* "Unnegotiates" a pad. The currently negotiated caps are cleared and the pad
* needs renegotiation.
*/
void
gst_pad_unnegotiate (GstPad *pad)
{
GstPadLink *link;
g_return_if_fail (GST_IS_PAD (pad));
link = GST_RPAD_LINK (GST_PAD_REALIZE (pad));
if (link)
gst_pad_link_unnegotiate (link);
}
/**
* gst_pad_try_relink_filtered:
* @srcpad: the source #GstPad to relink.
* @sinkpad: the sink #GstPad to relink.
* @filtercaps: the #GstPad to use as a filter in the relink.
*
* Tries to relink the given source and sink pad, constrained by the given
* capabilities.
*
* Returns: TRUE if the pads were succesfully renegotiated, FALSE otherwise.
*/
gboolean
gst_pad_try_relink_filtered (GstPad *srcpad, GstPad *sinkpad,
const GstCaps *filtercaps)
{
GstRealPad *realsrc, *realsink;
GstPadLink *link;
gchar *str;
/* generic checks */
g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE);
g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE);
str = filtercaps ? gst_caps_to_string (filtercaps) : g_strdup ("");
GST_CAT_INFO (GST_CAT_PADS, "trying to relink %s:%s and %s:%s with filtercaps %s",
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad), str);
g_free (str);
/* 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 (realsrc != NULL, FALSE);
g_return_val_if_fail (realsink != NULL, FALSE);
g_return_val_if_fail (GST_RPAD_PEER (realsrc) == realsink, FALSE);
g_assert (realsrc == GST_RPAD_PEER (realsink));
if ((GST_PAD (realsrc) != srcpad) || (GST_PAD (realsink) != sinkpad)) {
GST_CAT_INFO (GST_CAT_PADS, "*actually* linking %s:%s and %s:%s",
GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink));
}
link = gst_pad_link_new ();
if (GST_RPAD_DIRECTION (realsrc) == GST_PAD_SRC) {
link->srcpad = GST_PAD (realsrc);
link->sinkpad = GST_PAD (realsink);
} else {
link->srcpad = GST_PAD (realsink);
link->sinkpad = GST_PAD (realsrc);
}
if (GST_RPAD_DIRECTION (link->srcpad) != GST_PAD_SRC) {
GST_CAT_INFO (GST_CAT_PADS, "Real src pad %s:%s is not a source pad, failed",
GST_DEBUG_PAD_NAME (link->srcpad));
gst_pad_link_free (link);
return FALSE;
}
if (GST_RPAD_DIRECTION (link->sinkpad) != GST_PAD_SINK) {
GST_CAT_INFO (GST_CAT_PADS, "Real sink pad %s:%s is not a sink pad, failed",
GST_DEBUG_PAD_NAME (link->sinkpad));
gst_pad_link_free (link);
return FALSE;
}
link->srccaps = gst_pad_get_caps (link->srcpad);
link->sinkcaps = gst_pad_get_caps (link->sinkpad);
if (filtercaps) link->filtercaps = gst_caps_copy (filtercaps);
if (GST_PAD_LINK_FAILED (gst_pad_link_try (link)))
return FALSE;
return TRUE;
}
/**
* gst_pad_relink_filtered:
* @srcpad: the source #GstPad to relink.
* @sinkpad: the sink #GstPad to relink.
* @filtercaps: the #GstPad to use as a filter in the relink.
*
* Relinks the given source and sink pad, constrained by the given
* capabilities. If the relink fails, the pads are unlinked
* and FALSE is returned.
*
* Returns: TRUE if the pads were succesfully relinked, FALSE otherwise.
*/
gboolean
gst_pad_relink_filtered (GstPad *srcpad, GstPad *sinkpad,
const GstCaps *filtercaps)
{
if (gst_pad_try_relink_filtered (srcpad, sinkpad, filtercaps))
return TRUE;
gst_pad_unlink (srcpad, sinkpad);
return FALSE;
}
/**
* gst_pad_proxy_getcaps:
* @pad: a #GstPad to proxy.
*
* Calls gst_pad_get_allowed_caps() for every other pad belonging to the
* same element as @pad, and returns the intersection of the results.
*
* This function is useful as a default getcaps function for an element
* that can handle any stream format, but requires all its pads to have
* the same caps. Two such elements are tee and aggregator.
*
* Returns: the intersection of the other pads' allowed caps.
*/
GstCaps *
gst_pad_proxy_getcaps (GstPad *pad)
{
GstElement *element;
const GList *pads;
GstCaps *caps;
GST_DEBUG ("proxying getcaps for %s:%s\n", GST_DEBUG_PAD_NAME (pad));
element = gst_pad_get_parent (pad);
pads = gst_element_get_pad_list (element);
caps = gst_caps_new_any ();
while (pads) {
GstPad *otherpad = GST_PAD (pads->data);
GstCaps *temp;
if (otherpad != pad) {
temp = gst_caps_intersect (caps, gst_pad_get_allowed_caps (otherpad));
gst_caps_free (caps);
caps = temp;
}
pads = g_list_next (pads);
}
return caps;
}
/**
* gst_pad_proxy_pad_link:
* @pad: a #GstPad to proxy.
*
* Calls gst_pad_try_set_caps() for every other pad belonging to the
* same element as @pad. If gst_pad_try_set_caps() fails on any pad,
* the proxy link fails.
*
* Returns: GST_PAD_LINK_OK if sucessful
*/
GstPadLinkReturn
gst_pad_proxy_pad_link (GstPad *pad, const GstCaps *caps)
{
GstElement *element;
const GList *pads;
GstPadLinkReturn ret;
GST_DEBUG ("proxying pad link for %s:%s\n", GST_DEBUG_PAD_NAME (pad));
element = gst_pad_get_parent (pad);
pads = gst_element_get_pad_list (element);
while (pads) {
GstPad *otherpad = GST_PAD (pads->data);
if (otherpad != pad) {
ret = gst_pad_try_set_caps (otherpad, caps);
if (GST_PAD_LINK_FAILED (ret)) {
return ret;
}
}
pads = g_list_next (pads);
}
return GST_PAD_LINK_OK;
}
/**
* gst_pad_proxy_fixate:
* @pad: a #GstPad to proxy.
*
* Implements a default fixate function based on the caps set on the other
* pads in the element. This function should only be used if every pad
* has the same pad template caps.
*
* Returns: a fixated caps, or NULL if caps cannot be fixed
*/
GstCaps *
gst_pad_proxy_fixate (GstPad *pad, const GstCaps *caps)
{
GstElement *element;
const GList *pads;
const GstCaps *othercaps;
GST_DEBUG ("proxying fixate for %s:%s\n", GST_DEBUG_PAD_NAME (pad));
element = gst_pad_get_parent (pad);
pads = gst_element_get_pad_list (element);
while (pads) {
GstPad *otherpad = GST_PAD (pads->data);
/* FIXME check that each pad has the same pad template caps */
if (otherpad != pad) {
othercaps = gst_pad_get_negotiated_caps (otherpad);
if (othercaps) {
GstCaps *icaps;
icaps = gst_caps_intersect (othercaps, caps);
if (!gst_caps_is_empty (icaps)) {
return icaps;
} else {
gst_caps_free (icaps);
}
}
}
pads = g_list_next (pads);
}
return NULL;
}
/**
* gst_pad_set_explicit_caps:
* @pad: a #GstPad to set the explicit caps of
* @caps: the #GstCaps to set
*
* If a pad has been told to use explicit caps, this function is used
* to set the explicit caps. If @caps is NULL, the explicit caps are
* unset.
*
* This function calls gst_pad_try_set_caps() on the pad. If that
* call fails, GST_ELEMENT_ERROR() is called to indicate a negotiation
* failure.
*
* Returns: TRUE if the caps were set correctly, otherwise FALSE
*/
gboolean
gst_pad_set_explicit_caps (GstPad *pad, const GstCaps *caps)
{
GstPadLinkReturn link_ret;
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
GST_CAT_DEBUG (GST_CAT_PADS, "setting explicit caps to %s",
gst_caps_to_string (caps));
if (caps == NULL) {
GST_CAT_DEBUG (GST_CAT_PADS, "caps is NULL");
gst_caps_replace (&GST_RPAD_EXPLICIT_CAPS (pad), NULL);
return TRUE;
}
gst_caps_replace (&GST_RPAD_EXPLICIT_CAPS (pad), gst_caps_copy(caps));
if (!GST_PAD_IS_LINKED (pad)) {
GST_CAT_DEBUG (GST_CAT_PADS, "pad is not linked");
return TRUE;
}
link_ret = gst_pad_try_set_caps (pad, caps);
if (link_ret == GST_PAD_LINK_REFUSED) {
gst_element_error (gst_pad_get_parent (pad), CORE, PAD,
NULL,
("failed to negotiate (try_set_caps returned REFUSED)"));
return FALSE;
}
return TRUE;
}
static GstCaps *
gst_pad_explicit_getcaps (GstPad *pad)
{
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
if (GST_RPAD_EXPLICIT_CAPS (pad) == NULL) {
const GstCaps *caps = gst_pad_get_pad_template_caps (pad);
return gst_caps_copy (caps);
}
return gst_caps_copy (GST_RPAD_EXPLICIT_CAPS (pad));
}
static GstPadLinkReturn
gst_pad_explicit_link (GstPad *pad, const GstCaps *caps)
{
g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_LINK_REFUSED);
g_return_val_if_fail (caps != NULL, GST_PAD_LINK_REFUSED);
if (GST_RPAD_EXPLICIT_CAPS (pad) == NULL) {
return GST_PAD_LINK_DELAYED;
}
return GST_PAD_LINK_OK;
}
/**
* gst_pad_use_explicit_caps:
* @pad: a #GstPad to set to use explicit caps
*
* This function handles negotiation for pads that need to be set
* to particular caps under complete control of the element, based
* on some state in the element. This is often the case with
* decoders and other elements whose caps is determined by the data
* stream.
*
* WARNING: This function is a hack and will be replaced with something
* better in gstreamer-0.9.
*/
void
gst_pad_use_explicit_caps (GstPad *pad)
{
g_return_if_fail (GST_IS_PAD (pad));
gst_pad_set_getcaps_function (pad, gst_pad_explicit_getcaps);
gst_pad_set_link_function (pad, gst_pad_explicit_link);
gst_caps_replace (&GST_RPAD_EXPLICIT_CAPS (pad), NULL);
}
/**
* gst_pad_proxy_link:
* @pad: a #GstPad to proxy to.
* @caps: the #GstCaps to use in proxying.
*
* Proxies the link function to the specified pad.
*
* Returns: TRUE if the peer pad accepted the caps, FALSE otherwise.
*/
GstPadLinkReturn
gst_pad_proxy_link (GstPad *pad, const GstCaps *caps)
{
return gst_pad_try_set_caps (pad, caps);
}
/**
* gst_pad_is_negotiated:
* @pad: a #GstPad to get the negotiation status of
*
* Returns: TRUE if the pad has successfully negotiated caps.
*/
gboolean
gst_pad_is_negotiated (GstPad *pad)
{
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
if (!GST_PAD_REALIZE (pad))
return FALSE;
if (!GST_RPAD_LINK (pad))
return FALSE;
return (GST_RPAD_LINK (pad)->caps != NULL);
}
/**
* gst_pad_get_negotiated_caps:
* @pad: a #GstPad to get the negotiated capabilites of
*
* Gets the currently negotiated caps of a pad or NULL if the pad isn't
* negotiated.
*
* Returns: the currently negotiated caps of a pad or NULL if the pad isn't
* negotiated.
*/
G_CONST_RETURN GstCaps *
gst_pad_get_negotiated_caps (GstPad *pad)
{
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
if (!GST_PAD_REALIZE (pad))
return NULL;
if (!GST_RPAD_LINK (pad))
return NULL;
return GST_RPAD_LINK (pad)->caps;
}
/**
* gst_pad_get_caps:
* @pad: a #GstPad to get the capabilities of.
*
* Gets the capabilities of this pad.
*
* Returns: the #GstCaps of this pad. This function returns a new caps, so use
* gst_caps_free to get rid of it.
*/
GstCaps*
gst_pad_get_caps (GstPad *pad)
{
GstRealPad *realpad;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
realpad = GST_PAD_REALIZE (pad);
GST_CAT_DEBUG (GST_CAT_CAPS, "get pad caps of %s:%s (%p)",
GST_DEBUG_PAD_NAME (realpad), realpad);
if (GST_RPAD_GETCAPSFUNC (realpad)) {
GstCaps *caps;
GST_CAT_DEBUG (GST_CAT_CAPS, "using pad get function");
caps = GST_RPAD_GETCAPSFUNC (realpad) (GST_PAD (realpad));
if (caps == NULL) {
g_critical ("pad %s:%s returned NULL caps from getcaps function\n",
GST_ELEMENT_NAME(GST_PAD_PARENT(GST_PAD (realpad))),
GST_PAD_NAME(realpad));
caps = gst_caps_new_any ();
}
return caps;
} else if (GST_PAD_PAD_TEMPLATE (realpad)) {
GstPadTemplate *templ = GST_PAD_PAD_TEMPLATE (realpad);
const GstCaps *caps;
GST_CAT_DEBUG (GST_CAT_CAPS, "using pad template %p with caps %p",
templ, GST_PAD_TEMPLATE_CAPS (templ));
caps = GST_PAD_TEMPLATE_CAPS (templ);
#if 0
/* FIXME we should enable something like this someday, but this is
* a bit buggy */
if (!gst_caps_is_fixed (caps)) {
g_warning("pad %s:%s (%p) has no getcaps function and the pad template returns non-fixed caps. Element is probably broken.\n",
GST_DEBUG_PAD_NAME (realpad), realpad);
}
#endif
return gst_caps_copy (GST_PAD_TEMPLATE_CAPS (templ));
}
GST_CAT_DEBUG (GST_CAT_CAPS, "pad has no caps");
#if 0
/* FIXME enable */
g_warning("pad %s:%s (%p) has no pad template\n",
GST_DEBUG_PAD_NAME (realpad), realpad);
#endif
return gst_caps_new_any();
}
/**
* gst_pad_get_pad_template_caps:
* @pad: a #GstPad to get the template capabilities from.
*
* Gets the template capabilities of this pad.
*
* Returns: the template #GstCaps of this pad, unref the caps
* if you no longer need it.
*/
const GstCaps*
gst_pad_get_pad_template_caps (GstPad *pad)
{
static GstStaticCaps anycaps = GST_STATIC_CAPS ("ANY");
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));
#if 0
/* FIXME this should be enabled some day */
g_warning("pad %s:%s (%p) has no pad template\n",
GST_DEBUG_PAD_NAME (realpad), realpad);
#endif
return gst_static_caps_get(&anycaps);
}
/**
* gst_pad_template_get_caps_by_name:
* @templ: a #GstPadTemplate to get the capabilities of.
* @name: the name of the capability to get.
*
* Gets the capability with the given name from this pad template.
*
* Returns: the #GstCaps, or NULL if not found or in case of an error. unref
* the caps if you no longer need it.
*/
const 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;
/* FIXME */
//return gst_caps_copy (gst_caps_get_by_name (caps, name));
return NULL;
}
/**
* gst_pad_check_compatibility:
* @srcpad: the source #GstPad to check.
* @sinkpad: the sink #GstPad to check against.
*
* Checks if two pads have compatible capabilities.
*
* Returns: TRUE if they are compatible or if 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_is_always_compatible (GST_PAD_CAPS (srcpad),
GST_PAD_CAPS (sinkpad))) {
return FALSE;
}
else {
return TRUE;
}
}
else {
GST_CAT_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: a #GstPad to get the peer of.
*
* Gets the peer pad of this pad.
*
* Returns: the peer #GstPad.
*/
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: a #GstPad to get the allowed caps of.
*
* Gets the capabilities of the allowed media types that can
* flow through this pad. The caller must free the resulting caps.
*
* Returns: the allowed #GstCaps of the pad link. Free the caps when
* you no longer need it.
*/
GstCaps*
gst_pad_get_allowed_caps (GstPad *pad)
{
const GstCaps *mycaps;
GstCaps *caps;
GstCaps *peercaps;
GstCaps *icaps;
GstPadLink *link;
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_IS_REAL_PAD (pad), NULL);
GST_CAT_DEBUG (GST_CAT_PROPERTIES, "get allowed caps of %s:%s",
GST_DEBUG_PAD_NAME (pad));
mycaps = gst_pad_get_pad_template_caps (pad);
if (GST_RPAD_PEER (pad) == NULL) {
return gst_caps_copy (mycaps);
}
peercaps = gst_pad_get_caps (GST_PAD_PEER (pad));
caps = gst_caps_intersect (mycaps, peercaps);
gst_caps_free (peercaps);
link = GST_RPAD_LINK (pad);
if (link->filtercaps) {
icaps = gst_caps_intersect (caps, link->filtercaps);
gst_caps_free (caps);
return icaps;
} else {
return caps;
}
}
void
gst_pad_caps_change_notify (GstPad *pad)
{
/* call this to indicate that the return value of getcaps may have
* changed, and a renegotiation is suggested */
}
/**
* gst_pad_recover_caps_error:
* @pad: a #GstPad that had a failed capsnego
* @allowed: possible caps for the link
*
* Attempt to recover from a failed caps negotiation. This function
* is typically called by a plugin that exhausted its list of caps
* and wants the application to resolve the issue. The application
* should connect to the pad's caps_nego_failed signal and should
* resolve the issue by connecting another element for example.
*
* Returns: TRUE when the issue was resolved, dumps detailed information
* on the console and returns FALSE otherwise.
*/
gboolean
gst_pad_recover_caps_error (GstPad *pad, const GstCaps *allowed)
{
#if 0
/* FIXME */
GstElement *parent;
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
/* see if someone can resolve this */
if (g_signal_has_handler_pending (G_OBJECT (pad),
gst_real_pad_signals[REAL_CAPS_NEGO_FAILED], 0, FALSE))
{
/* clear pad caps first */
gst_caps_replace (&GST_PAD_CAPS (pad), NULL);
/* lets hope some signal manages to set the caps again */
g_signal_emit (G_OBJECT (pad), gst_real_pad_signals[REAL_CAPS_NEGO_FAILED], 0, allowed);
/* if the pad has caps now or is disabled, it's ok */
if (GST_PAD_CAPS (pad) != NULL || !GST_PAD_IS_ACTIVE (pad))
return TRUE;
}
/* report error */
parent = gst_pad_get_parent (pad);
gst_element_error (parent, CORE, PAD,
NULL,
("negotiation failed on pad %s:%s", GST_DEBUG_PAD_NAME (pad)));
#endif
return FALSE;
}
/**
* gst_pad_alloc_buffer:
* @pad: a #GstPad to get the buffer from.
*
* Allocates a new, empty buffer optimized to push to pad #pad. This
* function only works if #pad is a src pad.
*
* Returns: a new, empty #GstBuffer, or NULL if there is an error
*/
GstBuffer*
gst_pad_alloc_buffer (GstPad *pad, guint64 offset, gint size)
{
GstRealPad *peer;
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
g_return_val_if_fail (GST_PAD_IS_SRC (pad), NULL);
peer = GST_RPAD_PEER (pad);
if (!peer)
return gst_buffer_new_and_alloc(size);
GST_CAT_DEBUG (GST_CAT_BUFFER, "(%s:%s): getting buffer",
GST_DEBUG_PAD_NAME (pad));
if (peer->bufferallocfunc) {
GST_CAT_DEBUG (GST_CAT_PADS,
"calling bufferallocfunc &%s (@%p) of peer pad %s:%s",
GST_DEBUG_FUNCPTR_NAME (peer->bufferallocfunc),
&peer->bufferallocfunc, GST_DEBUG_PAD_NAME (((GstPad*) peer)));
return (peer->bufferallocfunc) (GST_PAD (peer), offset, size);
} else {
return gst_buffer_new_and_alloc(size);
}
}
static void
gst_real_pad_dispose (GObject *object)
{
GstPad *pad = GST_PAD (object);
/* No linked pad can ever be disposed.
* It has to have a parent to be linked
* and a parent would hold a reference */
g_assert (GST_PAD_PEER (pad) == NULL);
GST_CAT_DEBUG (GST_CAT_REFCOUNTING, "dispose %s:%s", GST_DEBUG_PAD_NAME(pad));
/* 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_CAT_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_CAT_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
/* FIXME: why isn't this on a GstElement ? */
/**
* gst_pad_load_and_link:
* @self: an #xmlNodePtr to read the description from.
* @parent: the #GstObject element that owns the pad.
*
* Reads the pad definition from the XML node and links the given pad
* in the element to a pad of an element up in the hierarchy.
*/
void
gst_pad_load_and_link (xmlNodePtr self, GstObject *parent)
{
xmlNodePtr field = self->xmlChildrenNode;
GstPad *pad = NULL, *targetpad;
gchar *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);
if (split[0] == NULL || split[1] == NULL) {
GST_CAT_DEBUG (GST_CAT_XML,
"Could not parse peer '%s' for pad %s:%s, leaving unlinked",
peer, GST_DEBUG_PAD_NAME (pad));
return;
}
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_link (pad, targetpad);
cleanup:
g_strfreev (split);
}
/**
* gst_pad_save_thyself:
* @pad: a #GstPad to save.
* @parent: the parent #xmlNodePtr to save the description in.
*
* Saves the pad into an xml representation.
*
* Returns: the #xmlNodePtr 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) {
gchar *content;
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 */
content = g_strdup_printf ("%s.%s",
GST_OBJECT_NAME (GST_PAD_PARENT (peer)),
GST_PAD_NAME (peer));
xmlNewChild (parent, NULL, "peer", content);
g_free (content);
} else
xmlNewChild (parent, NULL, "peer", "");
return parent;
}
/* FIXME: shouldn't pad and ghost be switched ?
*/
/**
* gst_ghost_pad_save_thyself:
* @pad: a ghost #GstPad to save.
* @parent: the parent #xmlNodePtr to save the description in.
*
* Saves the ghost pad into an xml representation.
*
* Returns: the #xmlNodePtr representation of the pad.
*/
xmlNodePtr
gst_ghost_pad_save_thyself (GstPad *pad, 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 */
/**
* gst_pad_push:
* @pad: a #GstPad to push the buffer out of.
* @data: the #GstData to push.
*
* Pushes a buffer or an event to the peer of the pad.
*/
void
gst_pad_push (GstPad *pad, GstData *data)
{
GstRealPad *peer;
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SRC);
g_return_if_fail (data != NULL);
if (!gst_probe_dispatcher_dispatch (&(GST_REAL_PAD (pad)->probedisp), &data))
return;
if (!GST_PAD_IS_LINKED (pad)) {
GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, pad, "not pushing data %p as pad is unconnected", data);
gst_data_unref (data);
return;
}
GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, pad, "pushing");
peer = GST_RPAD_PEER (pad);
if (!peer) {
g_warning ("push on pad %s:%s but it is unlinked",
GST_DEBUG_PAD_NAME (pad));
}
else {
if (!GST_IS_EVENT (data) && !GST_PAD_IS_ACTIVE (peer)) {
g_warning ("push on peer of pad %s:%s but peer is not active",
GST_DEBUG_PAD_NAME (pad));
return;
}
if (peer->chainhandler) {
if (data) {
GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, pad,
"calling chainhandler &%s of peer pad %s:%s",
GST_DEBUG_FUNCPTR_NAME (peer->chainhandler),
GST_DEBUG_PAD_NAME (GST_PAD (peer)));
if (!gst_probe_dispatcher_dispatch (&peer->probedisp, &data))
return;
(peer->chainhandler) (GST_PAD (peer), data);
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 (data != NULL) gst_data_unref (data);
}
/**
* gst_pad_pull:
* @pad: a #GstPad to pull a buffer from.
*
* Pulls an event or a buffer from the peer pad.
*
* Returns: a new #GstData from the peer pad.
*/
GstData*
gst_pad_pull (GstPad *pad)
{
GstRealPad *peer;
GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, pad, "pulling");
g_return_val_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SINK,
GST_DATA (gst_event_new (GST_EVENT_INTERRUPT)));
peer = GST_RPAD_PEER (pad);
if (!peer) {
gst_element_error (GST_PAD_PARENT (pad), CORE, PAD, NULL,
("pull on pad %s:%s but it was unlinked", GST_DEBUG_PAD_NAME (pad)));
}
else {
restart:
if (peer->gethandler) {
GstData *data;
GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, pad,
"calling gethandler %s of peer pad %s:%s",
GST_DEBUG_FUNCPTR_NAME (peer->gethandler),
GST_DEBUG_PAD_NAME (peer));
data = (peer->gethandler) (GST_PAD (peer));
if (data) {
if (!gst_probe_dispatcher_dispatch (&peer->probedisp, &data))
goto restart;
return data;
}
/* no null buffers allowed */
gst_element_error (GST_PAD_PARENT (pad), CORE, PAD, NULL,
("NULL buffer during pull on %s:%s", GST_DEBUG_PAD_NAME (pad)));
} else {
gst_element_error (GST_PAD_PARENT (pad), CORE, PAD, NULL,
("pull on pad %s:%s but the peer pad %s:%s has no gethandler",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_PAD_NAME (peer)));
}
}
return GST_DATA (gst_event_new (GST_EVENT_INTERRUPT));
}
/**
* gst_pad_selectv:
* @padlist: a #GList of pads.
*
* Waits for a buffer on any of the list of pads.
*
* Returns: the #GstPad that has a buffer available.
* Use #gst_pad_pull() to get the buffer.
*/
GstPad*
gst_pad_selectv (GList *padlist)
{
GstPad *pad;
pad = gst_scheduler_pad_select (GST_PAD_PARENT (padlist->data)->sched,
padlist);
return pad;
}
/**
* gst_pad_select:
* @pad: a first #GstPad to perform the select on.
* @...: A NULL-terminated list of more pads to select on.
*
* Waits for a buffer on the given set of pads.
*
* Returns: the #GstPad that has a buffer available.
* Use #gst_pad_pull() to get the buffer.
*/
GstPad*
gst_pad_select (GstPad *pad, ...)
{
GstPad *result;
va_list var_args;
if (pad == NULL)
return NULL;
va_start (var_args, pad);
result = gst_pad_select_valist (pad, var_args);
va_end (var_args);
return result;
}
/**
* gst_pad_select_valist:
* @pad: a first #GstPad to perform the select on.
* @varargs: A va_list of more pads to select on.
*
* Waits for a buffer on the given set of pads.
*
* Returns: the #GstPad that has a buffer available.
* Use #gst_pad_pull() to get the buffer.
*/
GstPad*
gst_pad_select_valist (GstPad *pad, va_list var_args)
{
GstPad *result;
GList *padlist = NULL;
if (pad == NULL)
return NULL;
while (pad) {
padlist = g_list_prepend (padlist, pad);
pad = va_arg (var_args, GstPad *);
}
result = gst_pad_selectv (padlist);
g_list_free (padlist);
return result;
}
/************************************************************************
*
* templates
*
*/
static void gst_pad_template_class_init (GstPadTemplateClass *klass);
static void gst_pad_template_init (GstPadTemplate *templ);
static void gst_pad_template_dispose (GObject *object);
GType
gst_pad_template_get_type (void)
{
static GType padtemplate_type = 0;
if (!padtemplate_type) {
static const GTypeInfo padtemplate_info = {
sizeof (GstPadTemplateClass), NULL, NULL,
(GClassInitFunc) gst_pad_template_class_init, NULL, NULL,
sizeof (GstPadTemplate),
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__OBJECT, G_TYPE_NONE, 1,
GST_TYPE_PAD);
gobject_class->dispose = gst_pad_template_dispose;
gstobject_class->path_string_separator = "*";
}
static void
gst_pad_template_init (GstPadTemplate *templ)
{
}
static void
gst_pad_template_dispose (GObject *object)
{
GstPadTemplate *templ = GST_PAD_TEMPLATE (object);
g_free (GST_PAD_TEMPLATE_NAME_TEMPLATE (templ));
if (GST_PAD_TEMPLATE_CAPS (templ)) {
gst_caps_free (GST_PAD_TEMPLATE_CAPS (templ));
}
G_OBJECT_CLASS (padtemplate_parent_class)->dispose (object);
}
/* 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_static_pad_template_get:
* @pad_template: the static pad template
*
* Converts a GstStaticPadTemplate into a GstPadTemplate.
*
* Returns: a new #GstPadTemplate.
*/
GstPadTemplate*
gst_static_pad_template_get (GstStaticPadTemplate *pad_template)
{
GstPadTemplate *new;
if (!name_is_valid (pad_template->name_template, pad_template->presence))
return NULL;
new = g_object_new (gst_pad_template_get_type (),
"name", pad_template->name_template,
NULL);
GST_PAD_TEMPLATE_NAME_TEMPLATE (new) =
g_strdup (pad_template->name_template);
GST_PAD_TEMPLATE_DIRECTION (new) = pad_template->direction;
GST_PAD_TEMPLATE_PRESENCE (new) = pad_template->presence;
GST_PAD_TEMPLATE_CAPS (new) = gst_caps_copy (
gst_static_caps_get (&pad_template->static_caps));
return new;
}
/**
* gst_pad_template_new:
* @name_template: the name template.
* @direction: the #GstPadDirection of the template.
* @presence: the #GstPadPresence of the pad.
* @caps: a #GstCaps set for the template. The caps are taken ownership of.
*
* Creates a new pad template with a name according to the given template
* and with the given arguments. This functions takes ownership of the provided
* caps, so be sure to not use them afterwards.
*
* Returns: a new #GstPadTemplate.
*/
GstPadTemplate*
gst_pad_template_new (const gchar *name_template,
GstPadDirection direction, GstPadPresence presence,
GstCaps *caps)
{
GstPadTemplate *new;
g_return_val_if_fail (name_template != NULL, NULL);
if (!name_is_valid (name_template, presence))
return NULL;
#if 0
#ifdef USE_POISONING
if (caps) {
GstCaps *newcaps = gst_caps_copy (caps);
gst_caps_free(caps);
caps = newcaps;
}
#endif
#endif
new = g_object_new (gst_pad_template_get_type (),
"name", name_template,
NULL);
GST_PAD_TEMPLATE_NAME_TEMPLATE (new) = g_strdup (name_template);
GST_PAD_TEMPLATE_DIRECTION (new) = direction;
GST_PAD_TEMPLATE_PRESENCE (new) = presence;
GST_PAD_TEMPLATE_CAPS (new) = caps;
return new;
}
/**
* gst_pad_template_get_caps:
* @templ: a #GstPadTemplate to get capabilities of.
*
* Gets the capabilities of the pad template.
*
* Returns: the #GstCaps of the pad template. unref the caps
* after use.
*/
const 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 #GstPad to set the private data of.
* @priv: The private data to attach to the pad.
*
* Set the given private data gpointer on the pad.
* This function can only be used by the element that owns the pad.
*/
void
gst_pad_set_element_private (GstPad *pad, gpointer priv)
{
pad->element_private = priv;
}
/**
* gst_pad_get_element_private:
* @pad: the #GstPad to get the private data of.
*
* Gets the private data of a pad.
*
* Returns: a #gpointer 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 void gst_ghost_pad_dispose (GObject *object);
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);
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_ghost_pad_dispose);
}
static void
gst_ghost_pad_init (GstGhostPad *pad)
{
/* zeroed by glib */
}
static void
gst_ghost_pad_dispose (GObject *object)
{
GstGhostPad *pad = GST_GHOST_PAD (object);
if (pad->realpad)
gst_pad_remove_ghost_pad((GstPad *) pad->realpad, (GstPad *) pad);
G_OBJECT_CLASS (ghost_pad_parent_class)->dispose (object);
}
/**
* gst_ghost_pad_new:
* @name: the name of the new ghost pad.
* @pad: the #GstPad to create a ghost pad for.
*
* Creates a new ghost pad associated with the given pad, and names it with
* the given name. If name is NULL, a guaranteed unique name (across all
* ghost pads) will be assigned (most likely of the form ghostpad%d).
*
* Returns: a new ghost #GstPad, or NULL in case of an error.
*/
GstPad*
gst_ghost_pad_new (const gchar *name,
GstPad *pad)
{
GstGhostPad *ghostpad;
GstRealPad *realpad;
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_set_pad_template (GST_PAD (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_CAT_DEBUG (GST_CAT_PADS, "created ghost pad \"%s\"",
gst_pad_get_name (GST_PAD (ghostpad)));
return GST_PAD (ghostpad);
}
/**
* gst_pad_get_internal_links_default:
* @pad: the #GstPad to get the internal links of.
*
* Gets a list of pads to which the given pad is linked to
* inside of the parent element.
* This is the default handler, and thus returns a list of all of the
* pads inside the parent element with opposite direction.
* The caller must free this list after use.
*
* Returns: a newly allocated #GList of pads.
*/
GList*
gst_pad_get_internal_links_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_links:
* @pad: the #GstPad to get the internal links of.
*
* Gets a list of pads to which the given pad is linked to
* inside of the parent element.
* The caller must free this list after use.
*
* Returns: a newly allocated #GList of pads.
*/
GList*
gst_pad_get_internal_links (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_INTLINKFUNC (rpad))
res = GST_RPAD_INTLINKFUNC (rpad) (GST_PAD (rpad));
return res;
}
static gboolean
gst_pad_event_default_dispatch (GstPad *pad, GstElement *element,
GstEvent *event)
{
GList *orig, *pads;
orig = pads = gst_pad_get_internal_links (pad);
while (pads) {
GstPad *eventpad = GST_PAD (pads->data);
pads = g_list_next (pads);
/* for all pads in the opposite direction that are linked */
if (GST_PAD_IS_LINKED (eventpad)) {
if (GST_PAD_DIRECTION (eventpad) == GST_PAD_SRC) {
/* increase the refcount */
gst_event_ref (event);
gst_pad_push (eventpad, GST_DATA (event));
}
else {
GstPad *peerpad = GST_PAD (GST_RPAD_PEER (eventpad));
/* we only send the event on one pad, multi-sinkpad elements
* should implement a handler */
g_list_free (orig);
return gst_pad_send_event (peerpad, event);
}
}
}
gst_event_unref (event);
g_list_free (orig);
return (GST_PAD_DIRECTION (pad) == GST_PAD_SINK);
}
/**
* gst_pad_event_default:
* @pad: a #GstPad to call the default event handler on.
* @event: the #GstEvent to handle.
*
* Invokes 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;
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
g_return_val_if_fail (event, FALSE);
element = GST_PAD_PARENT (pad);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
gst_pad_event_default_dispatch (pad, element, event);
gst_element_set_eos (element);
break;
case GST_EVENT_DISCONTINUOUS:
{
guint64 time;
if (gst_event_discont_get_value (event, GST_FORMAT_TIME, &time)) {
if (gst_element_requires_clock (element) && element->clock) {
gst_element_set_time (element, time);
}
}
}
case GST_EVENT_FLUSH:
default:
return gst_pad_event_default_dispatch (pad, element, event);
}
return TRUE;
}
/**
* gst_pad_dispatcher:
* @pad: a #GstPad to dispatch.
* @dispatch: the #GstDispatcherFunction to call.
* @data: gpointer user data passed to the dispatcher function.
*
* Invokes the given dispatcher function on all pads that are
* internally linked to the given pad.
* The GstPadDispatcherFunction should return TRUE when no further pads
* need to be processed.
*
* Returns: TRUE if one of the dispatcher functions returned TRUE.
*/
gboolean
gst_pad_dispatcher (GstPad *pad, GstPadDispatcherFunction dispatch,
gpointer data)
{
gboolean res = FALSE;
GList *int_pads, *orig;
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
g_return_val_if_fail (data, FALSE);
orig = int_pads = gst_pad_get_internal_links (pad);
while (int_pads) {
GstRealPad *int_rpad = GST_PAD_REALIZE (int_pads->data);
GstRealPad *int_peer = GST_RPAD_PEER (int_rpad);
if (int_peer) {
res = dispatch (GST_PAD (int_peer), data);
if (res)
break;
}
int_pads = g_list_next (int_pads);
}
g_list_free (orig);
return res;
}
/**
* gst_pad_send_event:
* @pad: a #GstPad to send the event to.
* @event: the #GstEvent to send to the pad.
*
* Sends the event to the pad.
*
* Returns: TRUE if the event was handled.
*/
gboolean
gst_pad_send_event (GstPad *pad, GstEvent *event)
{
gboolean success = FALSE;
GstRealPad *rpad;
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
g_return_val_if_fail (event, FALSE);
rpad = GST_PAD_REALIZE (pad);
if (GST_EVENT_SRC (event) == NULL)
GST_EVENT_SRC (event) = gst_object_ref (GST_OBJECT (rpad));
GST_CAT_DEBUG (GST_CAT_EVENT, "have event %d on pad %s:%s",
GST_EVENT_TYPE (event), GST_DEBUG_PAD_NAME (rpad));
if (GST_RPAD_EVENTHANDLER (rpad))
success = GST_RPAD_EVENTHANDLER (rpad) (GST_PAD (rpad), event);
else {
g_warning ("pad %s:%s has no event handler", GST_DEBUG_PAD_NAME (rpad));
gst_event_unref (event);
}
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: a #GstPad to invoke the default converter on.
* @src_format: the source #GstFormat.
* @src_value: the source value.
* @dest_format: a pointer to the destination #GstFormat.
* @dest_value: a pointer to the destination value.
*
* Invokes the default converter on a pad.
* This will forward the call to the pad obtained
* using the internal link 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 (GST_IS_PAD (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, (GstPadDispatcherFunction)
gst_pad_convert_dispatcher, &data);
}
/**
* gst_pad_convert:
* @pad: a #GstPad to invoke the default converter on.
* @src_format: the source #GstFormat.
* @src_value: the source value.
* @dest_format: a pointer to the destination #GstFormat.
* @dest_value: a pointer to the destination value.
*
* Invokes 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 (GST_IS_PAD (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);
if (GST_RPAD_CONVERTFUNC (rpad)) {
return GST_RPAD_CONVERTFUNC (rpad) (GST_PAD (rpad), src_format,
src_value, dest_format, dest_value);
}
return FALSE;
}
typedef struct
{
GstQueryType 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: a #GstPad to invoke the default query on.
* @type: the #GstQueryType of the query to perform.
* @format: a pointer to the #GstFormat of the result.
* @value: a pointer to the result.
*
* Invokes the default query function on a pad.
*
* Returns: TRUE if the query could be performed.
*/
gboolean
gst_pad_query_default (GstPad *pad, GstQueryType type,
GstFormat *format, gint64 *value)
{
GstPadQueryData data;
g_return_val_if_fail (GST_IS_PAD (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, (GstPadDispatcherFunction)
gst_pad_query_dispatcher, &data);
}
/**
* gst_pad_query:
* @pad: a #GstPad to invoke the default query on.
* @type: the #GstQueryType of the query to perform.
* @format: a pointer to the #GstFormat asked for.
* On return contains the #GstFormat used.
* @value: a pointer to the result.
*
* Queries a pad for one of the available properties. The format will be
* adjusted to the actual format used when specifying formats such as
* GST_FORMAT_DEFAULT.
* FIXME: Tell if the format can be adjusted when specifying a definite format.
*
* Returns: TRUE if the query could be performed.
*/
gboolean
gst_pad_query (GstPad *pad, GstQueryType type,
GstFormat *format, gint64 *value)
{
GstRealPad *rpad;
g_return_val_if_fail (GST_IS_PAD (pad), 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 (pad), type, format, value);
return FALSE;
}
static gboolean
gst_pad_get_formats_dispatcher (GstPad *pad, const GstFormat **data)
{
*data = gst_pad_get_formats (pad);
return TRUE;
}
/**
* gst_pad_get_formats_default:
* @pad: a #GstPad to query
*
* Invoke the default format dispatcher for the pad.
*
* Returns: An array of GstFormats ended with a 0 value.
*/
const GstFormat*
gst_pad_get_formats_default (GstPad *pad)
{
GstFormat *result = NULL;
gst_pad_dispatcher (pad, (GstPadDispatcherFunction)
gst_pad_get_formats_dispatcher, &result);
return result;
}
/**
* gst_pad_get_formats:
* @pad: a #GstPad to query
*
* Gets the list of supported formats from the pad.
*
* Returns: An array of GstFormats ended with a 0 value.
*/
const GstFormat*
gst_pad_get_formats (GstPad *pad)
{
GstRealPad *rpad;
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
rpad = GST_PAD_REALIZE (pad);
if (GST_RPAD_FORMATSFUNC (rpad))
return GST_RPAD_FORMATSFUNC (rpad) (GST_PAD (pad));
return NULL;
}
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