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gstreamer/gst/gstpad.c
Thomas Vander Stichele 1c5150d393 debugging additions and style cleanups 
Original commit message from CVS:
debugging additions and style cleanups
2004-07-15 16:20:50 +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 "gstmarshal.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"
GST_DEBUG_CATEGORY_STATIC (debug_dataflow);
#define DEBUG_DATA(obj,data,notice) G_STMT_START{\
if (GST_IS_EVENT (data)) { \
GST_CAT_DEBUG_OBJECT (debug_dataflow, obj, "%s event %p (type %d, refcount %d)", notice, data, \
GST_EVENT_TYPE (data), GST_DATA_REFCOUNT_VALUE (data)); \
} else { \
GST_CAT_LOG_OBJECT (debug_dataflow, obj, "%s buffer %p (size %u, refcount %d)", notice, data, \
GST_BUFFER_SIZE (data), GST_BUFFER_REFCOUNT_VALUE (data)); \
} \
}G_STMT_END
#define GST_CAT_DEFAULT GST_CAT_PADS
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;
gboolean engaged;
GstData *temp_store; /* used only when we invented a DISCONT */
};
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),
0,
(GInstanceInitFunc) gst_pad_init, NULL
};
_gst_pad_type = g_type_register_static (GST_TYPE_OBJECT, "GstPad",
&pad_info, 0);
GST_DEBUG_CATEGORY_INIT (debug_dataflow, "GST_DATAFLOW",
GST_DEBUG_BOLD | GST_DEBUG_FG_GREEN, "dataflow inside pads");
}
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_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),
0,
(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_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_BOXED__BOXED, GST_TYPE_CAPS, 1,
GST_TYPE_CAPS | G_SIGNAL_TYPE_STATIC_SCOPE);
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 (gst_value_get_caps (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;
}
}
/* FIXME-0.9: Replace these custom functions with proper inheritance via _init
functions and object properties */
/**
* 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 (GST_IS_PAD_TEMPLATE (templ), NULL);
pad = gst_pad_custom_new (type, 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);
}
/* FIXME 0.9: GST_PAD_UNKNOWN needs to die! */
/**
* 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);
if (GST_IS_REAL_PAD (pad))
return GST_PAD_DIRECTION (pad);
else
return GST_PAD_UNKNOWN;
}
/**
* 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;
GstPadLink *link;
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);
}
link = GST_RPAD_LINK (realpad);
if (link) {
if (link->temp_store) {
GST_CAT_INFO (GST_CAT_PADS,
"deleting cached data %p from bufpen of pad %s:%s", link->temp_store,
GST_DEBUG_PAD_NAME (realpad));
gst_data_unref (link->temp_store);
link->temp_store = NULL;
}
}
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);
}
/* FIXME 0.9: This function must die */
/**
* 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 (GST_IS_PAD (pad), NULL);
return GST_OBJECT_NAME (pad);
}
/**
* gst_pad_set_chain_function:
* @pad: a real sink #GstPad.
* @chain: the #GstPadChainFunction to set.
*
* Sets the given chain function for the pad. The chain function is called to
* process a #GstData input buffer.
*/
void
gst_pad_set_chain_function (GstPad * pad, GstPadChainFunction chain)
{
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 real source #GstPad.
* @get: the #GstPadGetFunction to set.
*
* Sets the given get function for the pad. The get function is called to
* produce a new #GstData to start the processing pipeline. Get functions cannot
* return %NULL.
*/
void
gst_pad_set_get_function (GstPad * pad, GstPadGetFunction get)
{
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 real source #GstPad.
* @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 real #GstPad of either direction.
* @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.
*
* Gets the array of eventmasks from the given pad.
*
* Returns: a zero-terminated array of #GstEventMask, or NULL if the pad does
* not have an event mask function.
*/
const GstEventMask *
gst_pad_get_event_masks (GstPad * pad)
{
GstRealPad *rpad;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
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.
*
* Invokes the default event masks dispatcher on the pad.
*
* Returns: a zero-terminated array of #GstEventMask, or NULL if none of the
* internally-linked pads have an event mask function.
*/
const GstEventMask *
gst_pad_get_event_masks_default (GstPad * pad)
{
GstEventMask *result = NULL;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
gst_pad_dispatcher (pad, (GstPadDispatcherFunction)
gst_pad_get_event_masks_dispatcher, &result);
return result;
}
/**
* gst_pad_set_convert_function:
* @pad: a real #GstPad of either direction.
* @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 (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: a real #GstPad of either direction.
* @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 (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: a real #GstPad of either direction.
* @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 (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: a #GstPad.
*
* Get an array of supported queries that can be performed
* on this pad.
*
* Returns: a zero-terminated array of #GstQueryType.
*/
const GstQueryType *
gst_pad_get_query_types (GstPad * pad)
{
GstRealPad *rpad;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
rpad = GST_PAD_REALIZE (pad);
g_return_val_if_fail (rpad, NULL);
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: a #GstPad.
*
* Invoke the default dispatcher for the query types on
* the pad.
*
* Returns: an zero-terminated array of #GstQueryType, or NULL if none of the
* internally-linked pads has a query types function.
*/
const GstQueryType *
gst_pad_get_query_types_default (GstPad * pad)
{
GstQueryType *result = NULL;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
gst_pad_dispatcher (pad, (GstPadDispatcherFunction)
gst_pad_get_query_types_dispatcher, &result);
return result;
}
/**
* gst_pad_set_internal_link_function:
* @pad: a real #GstPad of either direction.
* @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 (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: a real #GstPad of either direction.
* @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 (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 real #GstPad.
* @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. The caps passed to the link function are
* guaranteed to be fixed. This means that you can assume that the caps is not
* ANY or EMPTY, and that there is exactly one structure in the caps, and that
* all the fields in the structure are fixed.
*
* The return value GST_PAD_LINK_OK should be used when the caps are acceptable,
* and you've extracted all the necessary information from the caps and set the
* element's internal state appropriately.
*
* The return value GST_PAD_LINK_REFUSED should be used when the caps are
* unacceptable for whatever reason.
*
* The return value GST_PAD_LINK_DELAYED should be used when the element is in a
* state where it can't determine whether the caps are acceptable or not. This
* is often used if the element needs to open a device or process data before
* determining acceptable caps.
*
* @link must not call gst_caps_try_set_caps() on the pad that was specified as
* a parameter, although it may (and often should) call gst_caps_try_set_caps()
* on other pads.
*/
void
gst_pad_set_link_function (GstPad * pad, GstPadLinkFunction link)
{
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 real #GstPad.
* @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 (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 real #GstPad.
* @fixate: the #GstPadFixateFunction to set.
*
* Sets the given fixate function for the pad. Its job is to narrow down the
* possible caps for a connection. Fixate functions are called with a const
* caps, and should return a caps that is a strict subset of the given caps.
* That is, @fixate should create a caps that is "more fixed" than previously,
* but it does not have to return fixed caps. If @fixate can't provide more
* fixed caps, it should return %NULL.
*
* Note that @fixate will only be called after the "fixate" signal is emitted,
* and only if the caps are still non-fixed.
*/
void
gst_pad_set_fixate_function (GstPad * pad, GstPadFixateFunction fixate)
{
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 real #GstPad.
* @getcaps: the #GstPadGetCapsFunction to set.
*
* Sets the given getcaps function for the pad. @getcaps should return the
* allowable caps for a pad in the context of the element's state, its link to
* other elements, and the devices or files it has opened. These caps must be a
* subset of the pad template caps. In the NULL state with no links, @getcaps
* should ideally return the same caps as the pad template. In rare
* circumstances, an object property can affect the caps returned by @getcaps,
* but this is discouraged.
*
* You do not need to call this function if @pad's allowed caps are always the
* same as the pad template caps.
*
* For most filters, the caps returned by @getcaps is directly affected by the
* allowed caps on other pads. For demuxers and decoders, the caps returned by
* the srcpad's getcaps function is directly related to the stream data. Again,
* @getcaps should return the most specific caps it reasonably can, since this
* helps with autoplugging. However, the returned caps should not depend on the
* stream type currently negotiated for @pad.
*
* Note that the return value from @getcaps is owned by the caller.
*/
void
gst_pad_set_getcaps_function (GstPad * pad, GstPadGetCapsFunction getcaps)
{
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 real sink #GstPad.
* @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 (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));
}
/* FIXME 0.9: Do we actually want to allow the case where src and sink are
switched? */
/**
* gst_pad_unlink:
* @srcpad: the source #GstPad to unlink.
* @sinkpad: the sink #GstPad to unlink.
*
* Unlinks the source pad from the sink pad. Will emit the "unlinked" signal on
* both pads.
*/
void
gst_pad_unlink (GstPad * srcpad, GstPad * sinkpad)
{
GstRealPad *realsrc, *realsink;
GstScheduler *src_sched, *sink_sched;
g_return_if_fail (GST_IS_PAD (srcpad));
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);
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 @pad is linked to another pad or not.
*
* Returns: TRUE if the pad is linked, FALSE otherwise.
*/
gboolean
gst_pad_is_linked (GstPad * pad)
{
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
return GST_PAD_PEER (pad) != NULL;
}
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;
link->engaged = FALSE;
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);
if (link->temp_store)
gst_data_unref (link->temp_store);
#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 ("... srccaps %" GST_PTR_FORMAT, link->srccaps);
GST_DEBUG ("... sinkcaps %" GST_PTR_FORMAT, link->sinkcaps);
GST_DEBUG ("... filtercaps %" GST_PTR_FORMAT, link->filtercaps);
pad_intersection = gst_caps_intersect (link->srccaps, link->sinkcaps);
if (link->filtercaps) {
GST_DEBUG ("unfiltered intersection %" GST_PTR_FORMAT, pad_intersection);
link->caps = gst_caps_intersect (pad_intersection, link->filtercaps);
gst_caps_free (pad_intersection);
} else {
link->caps = pad_intersection;
}
GST_DEBUG ("intersection %" GST_PTR_FORMAT, 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 ("trying to fixate caps %" GST_PTR_FORMAT, caps);
gst_caps_do_simplify (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 ("app srcpad signal fixated to %" GST_PTR_FORMAT, newcaps);
break;
case 1:
g_signal_emit (G_OBJECT (link->sinkpad),
gst_real_pad_signals[REAL_FIXATE], 0, caps, &newcaps);
GST_DEBUG ("app sinkpad signal fixated to %" GST_PTR_FORMAT, newcaps);
break;
case 2:
if (GST_RPAD_FIXATEFUNC (link->srcpad)) {
newcaps =
GST_RPAD_FIXATEFUNC (link->srcpad) (GST_PAD (link->srcpad),
caps);
GST_DEBUG ("srcpad %s:%s fixated to %" GST_PTR_FORMAT,
GST_DEBUG_PAD_NAME (link->srcpad), newcaps);
} else
GST_DEBUG ("srcpad %s:%s doesn't have a fixate function",
GST_DEBUG_PAD_NAME (link->srcpad));
break;
case 3:
if (GST_RPAD_FIXATEFUNC (link->sinkpad)) {
newcaps =
GST_RPAD_FIXATEFUNC (link->sinkpad) (GST_PAD (link->sinkpad),
caps);
GST_DEBUG ("sinkpad %s:%s fixated to %" GST_PTR_FORMAT,
GST_DEBUG_PAD_NAME (link->sinkpad), newcaps);
} else
GST_DEBUG ("sinkpad %s:%s doesn't have a fixate function",
GST_DEBUG_PAD_NAME (link->sinkpad));
break;
case 4:
newcaps = _gst_pad_default_fixate_func (GST_PAD (link->srcpad), caps);
GST_DEBUG ("core fixated to %" GST_PTR_FORMAT, newcaps);
break;
}
if (newcaps) {
G_GNUC_UNUSED gboolean bad;
gst_caps_do_simplify (newcaps);
#ifndef G_DISABLE_CHECKS
/* some mad checking for correctly working fixation functions */
if (i == 4) {
/* we trust the default fixation function unconditionally */
bad = FALSE;
} else if (gst_caps_is_any (caps)) {
bad = gst_caps_is_any (newcaps);
} else {
GstCaps *test = gst_caps_subtract (caps, newcaps);
bad = gst_caps_is_empty (test);
gst_caps_free (test);
/* simplifying is ok, too */
if (bad)
bad = (gst_caps_get_size (newcaps) >= gst_caps_get_size (caps));
}
if (bad) {
gchar *newcaps_str = gst_caps_to_string (newcaps);
gchar *caps_str = gst_caps_to_string (caps);
g_warning
("a fixation function did not fixate correctly, the returned caps %s are no true subset of %s.",
newcaps_str, caps_str);
g_free (newcaps_str);
g_free (caps_str);
gst_caps_free (newcaps);
} else
#endif
{
gst_caps_free (caps);
caps = newcaps;
break;
}
}
}
}
link->caps = caps;
}
static GstPadLinkReturn
gst_pad_link_call_link_functions (GstPadLink * link)
{
GstPadLinkReturn res = GST_PAD_LINK_OK;
/* Detect recursion. */
if (GST_PAD_IS_NEGOTIATING (link->srcpad) ||
GST_PAD_IS_NEGOTIATING (link->sinkpad)) {
GST_ERROR ("The link functions have recursed, please file a bug!");
return GST_PAD_LINK_REFUSED;
}
/* Both of the pads are in negotiation, so we set the NEGOTIATING flag on both
* of them now to avoid recursion from either pad. */
GST_FLAG_SET (link->srcpad, GST_PAD_NEGOTIATING);
GST_FLAG_SET (link->sinkpad, GST_PAD_NEGOTIATING);
/* If this doesn't run, the status is left to the default OK value. */
if (link->srcnotify && GST_RPAD_LINKFUNC (link->srcpad)) {
GST_DEBUG ("calling link function on pad %s:%s",
GST_DEBUG_PAD_NAME (link->srcpad));
/* call the link function */
res = GST_RPAD_LINKFUNC (link->srcpad) (GST_PAD (link->srcpad), link->caps);
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_PTR_FORMAT,
GST_DEBUG_PAD_NAME (link->srcpad), link->caps);
}
}
if (GST_PAD_LINK_SUCCESSFUL (res) &&
link->sinknotify && GST_RPAD_LINKFUNC (link->sinkpad)) {
GST_DEBUG ("calling link function on pad %s:%s",
GST_DEBUG_PAD_NAME (link->sinkpad));
/* call the link function */
res = GST_RPAD_LINKFUNC (link->sinkpad) (GST_PAD (link->sinkpad),
link->caps);
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_PTR_FORMAT,
GST_DEBUG_PAD_NAME (link->sinkpad), link->caps);
}
}
GST_FLAG_UNSET (link->srcpad, GST_PAD_NEGOTIATING);
GST_FLAG_UNSET (link->sinkpad, GST_PAD_NEGOTIATING);
return res;
}
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));
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;
if (!gst_pad_link_ready_for_negotiation (link)) {
return GST_PAD_LINK_DELAYED;
}
GST_DEBUG ("trying to call link function on caps %" GST_PTR_FORMAT,
link->caps);
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));
GST_DEBUG ("negotiating given link");
ret = gst_pad_link_negotiate (link);
if (GST_PAD_LINK_FAILED (ret) && oldlink && oldlink->caps) {
GST_DEBUG ("negotiating failed, but there was a valid old link");
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_DEBUG ("link refused, returning");
gst_pad_link_free (link);
return ret;
}
if (ret == GST_PAD_LINK_DELAYED) {
GST_DEBUG ("link delayed, replacing link caps and returning");
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_DEBUG ("copying stuff from oldlink");
link->temp_store = oldlink->temp_store;
GST_DEBUG ("moving old data temp store %p", link->temp_store);
link->engaged = oldlink->engaged;
oldlink->temp_store = NULL;
gst_pad_link_free (oldlink);
}
GST_RPAD_LINK (srcpad) = link;
GST_RPAD_LINK (sinkpad) = link;
if (ret == GST_PAD_LINK_OK) {
GST_DEBUG ("notifying caps after successful link");
g_object_notify (G_OBJECT (srcpad), "caps");
g_object_notify (G_OBJECT (sinkpad), "caps");
}
return ret;
}
/**
* gst_pad_renegotiate:
* @pad: a #GstPad
*
* Initiate caps negotiation on @pad. @pad must be linked.
*
* If @pad's parent is not at least in #GST_STATE_READY, returns
* #GST_PAD_LINK_DELAYED.
*
* Otherwise caps are retrieved from both @pad and its peer by calling their
* getcaps functions. They are then intersected, returning #GST_PAD_LINK_FAIL if
* there is no intersection.
*
* The intersection is fixated if necessary, and then the link functions of @pad
* and its peer are called.
*
* Returns: The return value of @pad's link function (see
* gst_pad_set_link_function()), or #GST_PAD_LINK_OK if there is no link
* function.
*
* The macros GST_PAD_LINK_SUCCESSFUL() and GST_PAD_LINK_FAILED() should be used
* when you just need success/failure information.
*/
GstPadLinkReturn
gst_pad_renegotiate (GstPad * pad)
{
GstPadLink *link;
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);
}
/**
* gst_pad_try_set_caps:
* @pad: a #GstPad
* @caps: #GstCaps to set on @pad
*
* Try to set the caps on @pad. @caps must be fixed. If @pad is unlinked,
* returns #GST_PAD_LINK_OK without doing anything. Otherwise, start caps
* negotiation on @pad.
*
* Returns: The return value of @pad's link function (see
* gst_pad_set_link_function()), or #GST_PAD_LINK_OK if there is no link
* function.
*
* The macros GST_PAD_LINK_SUCCESSFUL() and GST_PAD_LINK_FAILED() should be used
* when you just need success/failure information.
*/
GstPadLinkReturn
gst_pad_try_set_caps (GstPad * pad, const GstCaps * caps)
{
GstPadLink *link;
GstPadLink *oldlink;
GstPadLinkReturn ret;
g_return_val_if_fail (GST_IS_REAL_PAD (pad), GST_PAD_LINK_REFUSED);
GST_LOG_OBJECT (pad, "Trying to set %" GST_PTR_FORMAT, caps);
if (GST_PAD_IS_NEGOTIATING (pad)) {
GST_DEBUG_OBJECT (pad, "Detected a recursion, just returning OK");
return GST_PAD_LINK_OK;
}
GST_CAT_INFO_OBJECT (GST_CAT_CAPS, pad, "caps %" GST_PTR_FORMAT, caps);
/* 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_DEBUG ("unfixed caps %" GST_PTR_FORMAT, caps);
return GST_PAD_LINK_REFUSED;
}
/* we allow setting caps on non-linked pads. It's ignored */
if (!GST_PAD_PEER (pad)) {
GST_DEBUG ("unlinked pad %s:%s, returning OK", GST_DEBUG_PAD_NAME (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);
/* if the desired caps are already there, it's trivially ok */
if (GST_PAD_CAPS (pad) && gst_caps_is_equal (caps, GST_PAD_CAPS (pad))) {
GST_DEBUG ("pad %s:%s already has these caps", GST_DEBUG_PAD_NAME (pad));
return GST_PAD_LINK_OK;
}
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_DEBUG ("link not ready for negotiating, delaying");
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;
}
GST_DEBUG ("trying to link");
ret = gst_pad_link_try (link);
return ret;
}
/**
* gst_pad_try_set_caps_nonfixed:
* @pad: a real #GstPad
* @caps: #GstCaps to set on @pad
*
* Like gst_pad_try_set_caps(), but allows non-fixed caps.
*
* Returns: a #GstPadLinkReturn, like gst_pad_try_set_caps().
*/
GstPadLinkReturn
gst_pad_try_set_caps_nonfixed (GstPad * pad, const GstCaps * caps)
{
GstPadLink *link;
GstPadLink *oldlink;
GstPadLinkReturn ret;
g_return_val_if_fail (GST_IS_REAL_PAD (pad), GST_PAD_LINK_REFUSED);
g_return_val_if_fail (!GST_PAD_IS_NEGOTIATING (pad), 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;
}
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);
/* if the link is already negotiated and the caps are compatible
* with what we're setting, it's trivially OK. */
if (GST_PAD_CAPS (pad)) {
GstCaps *intersection;
intersection = gst_caps_intersect (caps, GST_PAD_CAPS (pad));
if (!gst_caps_is_empty (intersection)) {
gst_caps_free (intersection);
return GST_PAD_LINK_OK;
}
gst_caps_free (intersection);
}
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. Both @srcpad and @sinkpad must be unlinked.
*
* 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)) {
gst_pad_link_free (link);
return FALSE;
}
gst_pad_link_free (link);
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 linked.
*
* 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.
*
* 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);
}
/* FIXME 0.9: Remove this */
/**
* gst_pad_set_parent:
* @pad: a #GstPad to set the parent of.
* @parent: the new parent #GstElement.
*
* Sets the parent object of a pad. Deprecated, use gst_object_set_parent()
* instead.
*/
void
gst_pad_set_parent (GstPad * pad, GstElement * parent)
{
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (GST_PAD_PARENT (pad) == NULL);
g_return_if_fail (GST_IS_ELEMENT (parent));
gst_object_set_parent (GST_OBJECT (pad), GST_OBJECT (parent));
}
/* FIXME 0.9: Remove this */
/**
* gst_pad_get_parent:
* @pad: the #GstPad to get the parent of.
*
* Gets the parent object of this pad. Deprecated, use gst_object_get_parent()
* instead.
*
* 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) {
gst_object_sink (GST_OBJECT (templ));
g_signal_emit (G_OBJECT (templ),
gst_pad_template_signals[TEMPL_PAD_CREATED], 0, pad);
}
}
/**
* gst_pad_get_pad_template:
* @pad: a #GstPad.
*
* Gets the template for @pad.
*
* Returns: the #GstPadTemplate from which this pad was instantiated, or %NULL
* if this pad has no template.
*/
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, or %NULL if there is no parent or the
* parent is not yet in a managing bin.
*/
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 (GST_IS_PAD (pad), NULL);
return GST_PAD_PARENT (GST_PAD (GST_PAD_REALIZE (pad)));
}
/* FIXME 0.9: Make static. */
/**
* 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. Private function, will be removed from the API in
* 0.9.
*/
void
gst_pad_add_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));
/* if we're ghosting a ghost pad, drill down to find the real pad */
realpad = (GstRealPad *) pad;
while (GST_IS_GHOST_PAD (realpad))
realpad = GST_GPAD_REALPAD (realpad);
g_return_if_fail (GST_IS_REAL_PAD (realpad));
/* will ref the pad template */
GST_GPAD_REALPAD (ghostpad) = realpad;
realpad->ghostpads = g_list_prepend (realpad->ghostpads, ghostpad);
gst_pad_set_pad_template (GST_PAD (ghostpad), GST_PAD_PAD_TEMPLATE (pad));
}
/* FIXME 0.9: Make static. */
/**
* 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. Private, will be removed from the API in 0.9.
*/
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);
gst_pad_set_pad_template (GST_PAD (ghostpad), NULL);
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 (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 (gst_type_is_fixed (type))
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_structure_copy (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. See gst_pad_renegotiate() for a brief
* description of caps negotiation.
*
* 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));
}
static void
gst_pad_link_unnegotiate (GstPadLink * link)
{
g_return_if_fail (link != NULL);
if (link->caps) {
gst_caps_free (link->caps);
link->caps = NULL;
link->engaged = FALSE;
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);
}
/* returning NULL indicates that the arguments are invalid */
static GstPadLink *
gst_pad_link_prepare (GstPad * srcpad, GstPad * sinkpad,
const GstCaps * filtercaps)
{
GstRealPad *realsrc, *realsink;
GstPadLink *link;
g_return_val_if_fail (GST_IS_PAD (srcpad), NULL);
g_return_val_if_fail (GST_IS_PAD (sinkpad), NULL);
realsrc = GST_PAD_REALIZE (srcpad);
realsink = GST_PAD_REALIZE (sinkpad);
if ((GST_PAD (realsrc) != srcpad) || (GST_PAD (realsink) != sinkpad)) {
GST_CAT_DEBUG (GST_CAT_PADS, "*actually* linking %s:%s and %s:%s",
GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink));
}
g_return_val_if_fail (GST_RPAD_PEER (realsrc) == NULL, NULL);
g_return_val_if_fail (GST_RPAD_PEER (realsink) == NULL, NULL);
g_return_val_if_fail (GST_PAD_PARENT (realsrc) != NULL, NULL);
g_return_val_if_fail (GST_PAD_PARENT (realsink) != NULL, NULL);
if (!gst_pad_check_schedulers (realsrc, realsink)) {
g_warning ("linking pads with different scheds requires "
"exactly one decoupled element (such as queue)");
return NULL;
}
if (GST_RPAD_DIRECTION (realsrc) == GST_RPAD_DIRECTION (realsink)) {
g_warning ("%s:%s and %s:%s are both %s pads, failed",
GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink),
GST_RPAD_DIRECTION (realsrc) == GST_PAD_SRC ? "src" : "sink");
return NULL;
}
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);
}
link->srccaps = gst_pad_get_caps (link->srcpad);
link->sinkcaps = gst_pad_get_caps (link->sinkpad);
if (filtercaps)
link->filtercaps = gst_caps_copy (filtercaps);
return 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)
{
GstPadLink *link;
GST_INFO ("trying to relink %" GST_PTR_FORMAT " and %" GST_PTR_FORMAT
" with filtercaps %" GST_PTR_FORMAT, srcpad, sinkpad);
link = gst_pad_link_prepare (srcpad, sinkpad, filtercaps);
if (!link)
return FALSE;
if (GST_RPAD_PEER (link->srcpad) != (GstRealPad *) link->sinkpad) {
g_warning ("Pads %s:%s and %s:%s were never linked",
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
gst_pad_link_free (link);
return FALSE;
}
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, *intersected;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
GST_DEBUG ("proxying getcaps for %s:%s", 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) {
GstCaps *allowed = gst_pad_get_allowed_caps (otherpad);
temp = gst_caps_intersect (caps, allowed);
gst_caps_free (caps);
gst_caps_free (allowed);
caps = temp;
}
pads = g_list_next (pads);
}
intersected = gst_caps_intersect (caps, gst_pad_get_pad_template_caps (pad));
gst_caps_free (caps);
return intersected;
}
/**
* gst_pad_proxy_pad_link:
* @pad: a #GstPad to proxy from
* @caps: the #GstCaps to link with
*
* 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. May be used only during negotiation.
*
* 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;
g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_LINK_REFUSED);
g_return_val_if_fail (caps != NULL, GST_PAD_LINK_REFUSED);
GST_DEBUG ("proxying pad link for %s:%s", 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.
* @caps: the #GstCaps to fixate
*
* 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;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
g_return_val_if_fail (caps != NULL, NULL);
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 && !gst_caps_is_subset (caps, 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 on %s:%s to %" GST_PTR_FORMAT,
GST_DEBUG_PAD_NAME (pad), 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) {
gchar *caps_str = gst_caps_to_string (caps);
GST_ELEMENT_ERROR (gst_pad_get_parent (pad), CORE, PAD, (NULL),
("failed to negotiate (try_set_caps with \"%s\" returned REFUSED)",
caps_str));
g_free (caps_str);
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.
*
* 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_PAD_IS_DISPATCHING (realpad))
GST_CAT_DEBUG (GST_CAT_CAPS,
"pad %s:%s is already dispatching -- looking for a template",
GST_DEBUG_PAD_NAME (realpad));
if (GST_RPAD_GETCAPSFUNC (realpad) && !GST_PAD_IS_DISPATCHING (realpad)) {
GstCaps *caps;
GST_CAT_DEBUG (GST_CAT_CAPS, "dispatching to pad getcaps function");
GST_FLAG_SET (realpad, GST_PAD_DISPATCHING);
caps = GST_RPAD_GETCAPSFUNC (realpad) (GST_PAD (realpad));
GST_FLAG_UNSET (realpad, GST_PAD_DISPATCHING);
if (caps == NULL) {
g_critical ("pad %s:%s returned NULL caps from getcaps function\n",
GST_DEBUG_PAD_NAME (realpad));
} else {
#ifndef G_DISABLE_ASSERT
/* check that the returned caps are a real subset of the template caps */
if (GST_PAD_PAD_TEMPLATE (realpad)) {
const GstCaps *templ_caps =
GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (realpad));
if (!gst_caps_is_subset (caps, templ_caps)) {
GstCaps *temp;
GST_CAT_ERROR_OBJECT (GST_CAT_CAPS, pad,
"pad returned caps %" GST_PTR_FORMAT
" which are not a real subset of its template caps %"
GST_PTR_FORMAT, caps, templ_caps);
g_warning
("pad %s:%s returned caps that are not a real subset of its template caps",
GST_DEBUG_PAD_NAME (realpad));
temp = gst_caps_intersect (templ_caps, caps);
gst_caps_free (caps);
caps = temp;
}
}
#endif
return caps;
}
}
if (GST_PAD_PAD_TEMPLATE (realpad)) {
GstPadTemplate *templ = GST_PAD_PAD_TEMPLATE (realpad);
const GstCaps *caps;
caps = GST_PAD_TEMPLATE_CAPS (templ);
GST_CAT_DEBUG (GST_CAT_CAPS,
"using pad template %p with caps %" GST_PTR_FORMAT, templ, caps);
#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 capabilities for @pad's template.
*
* Returns: the #GstCaps of this pad template. If you intend to keep a reference
* on the caps, make a copy (see gst_caps_copy ()).
*/
const GstCaps *
gst_pad_get_pad_template_caps (GstPad * pad)
{
static GstStaticCaps anycaps = GST_STATIC_CAPS ("ANY");
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 */
/* wingo: why? mail the list during 0.9 when you find this :) */
g_warning ("pad %s:%s (%p) has no pad template\n",
GST_DEBUG_PAD_NAME (realpad), realpad);
#endif
return gst_static_caps_get (&anycaps);
}
/* FIXME 0.9: This function should probably die, or at least be renamed to
* get_caps_by_format. */
/**
* 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 @templ.
*
* Returns: the #GstCaps of this pad template, or NULL if not found. If you
* intend to keep a reference on the caps, make a copy (see gst_caps_copy ()).
*/
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 NULL;
}
/* FIXME 0.9: What good is this if it only works for already-negotiated pads? */
/**
* gst_pad_check_compatibility:
* @srcpad: the source #GstPad to check.
* @sinkpad: the sink #GstPad to check against.
*
* Checks if two pads have compatible capabilities. If neither one has yet been
* negotiated, returns TRUE for no good reason.
*
* Returns: TRUE if they are compatible or if the capabilities could not be
* checked, FALSE if the capabilities are not compatible.
*/
gboolean
gst_pad_check_compatibility (GstPad * srcpad, GstPad * sinkpad)
{
g_return_val_if_fail (GST_IS_PAD (srcpad), 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 of @pad.
*
* Returns: the peer #GstPad.
*/
GstPad *
gst_pad_get_peer (GstPad * pad)
{
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
return GST_PAD (GST_PAD_PEER (pad));
}
/**
* gst_pad_get_allowed_caps:
* @pad: a real #GstPad.
*
* Gets the capabilities of the allowed media types that can flow through @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 (GST_IS_REAL_PAD (pad), NULL);
GST_CAT_DEBUG (GST_CAT_PROPERTIES, "%s:%s: getting allowed caps",
GST_DEBUG_PAD_NAME (pad));
mycaps = gst_pad_get_pad_template_caps (pad);
if (GST_RPAD_PEER (pad) == NULL) {
GST_CAT_DEBUG (GST_CAT_PROPERTIES, "%s:%s: no peer, returning template",
GST_DEBUG_PAD_NAME (pad));
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);
GST_CAT_DEBUG (GST_CAT_PROPERTIES,
"%s:%s: returning filtered intersection with peer",
GST_DEBUG_PAD_NAME (pad));
return icaps;
} else {
GST_CAT_DEBUG (GST_CAT_PROPERTIES,
"%s:%s: returning unfiltered intersection with peer",
GST_DEBUG_PAD_NAME (pad));
return caps;
}
}
/**
* gst_pad_caps_change_notify:
* @pad: a #GstPad
*
* Called to indicate that the return value of @pad's getcaps function may have
* changed, and that a renegotiation is suggested.
*/
void
gst_pad_caps_change_notify (GstPad * pad)
{
}
/**
* 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)
{
/* FIXME */
return FALSE;
}
/**
* gst_pad_alloc_buffer:
* @pad: a source #GstPad
* @offset: the offset of the new buffer in the stream
* @size: the size of the new buffer
*
* Allocates a new, empty buffer optimized to push to pad @pad. This
* function only works if @pad is a source 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 (GST_IS_PAD (pad), NULL);
g_return_val_if_fail (GST_PAD_IS_SRC (pad), NULL);
peer = GST_RPAD_PEER (pad);
if (peer && peer->bufferallocfunc) {
GstBuffer *ret;
GST_CAT_DEBUG (GST_CAT_BUFFER, "(%s:%s): getting buffer",
GST_DEBUG_PAD_NAME (pad));
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)));
ret = (peer->bufferallocfunc) (GST_PAD (peer), offset, size);
if (ret)
return ret;
}
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 */
/* FIXME: what about if g_object_dispose is explicitly called on the pad? Is
that legal? otherwise we could assert GST_OBJECT_PARENT (pad) == NULL as
well... */
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))) {
GstElement *parent = GST_ELEMENT (GST_OBJECT_PARENT (ghostpad));
GST_CAT_DEBUG (GST_CAT_REFCOUNTING,
"removing ghost pad from element '%s'", GST_OBJECT_NAME (parent));
gst_element_remove_pad (parent, ghostpad);
} else {
/* handle the case where we have some floating ghost pad that was never
added to an element */
g_object_set (ghostpad, "real-pad", NULL, NULL);
}
ghostpads = g_list_next (ghostpads);
}
g_list_free (orig);
/* as the ghost pads are removed, they remove themselves from ->ghostpads.
So it should be empty now. Let's assert that. */
g_assert (GST_REAL_PAD (pad)->ghostpads == NULL);
}
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);
}
if (GST_RPAD_EXPLICIT_CAPS (pad)) {
GST_ERROR_OBJECT (pad, "still explicit caps %" GST_PTR_FORMAT " set",
GST_RPAD_EXPLICIT_CAPS (pad));
g_warning ("pad %p has still explicit caps set", pad);
gst_caps_replace (&GST_RPAD_EXPLICIT_CAPS (pad), NULL);
}
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 it be gst_pad_ghost_* ?
* dunno -- wingo 7 feb 2004
*/
/**
* 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 */
static GstData *
_invent_event (GstPad * pad, GstBuffer * buffer)
{
GstEvent *event;
GstEventType event_type;
guint64 offset;
if (GST_BUFFER_OFFSET_IS_VALID (buffer))
event_type = GST_FORMAT_DEFAULT;
else
event_type = GST_FORMAT_UNDEFINED;
offset = GST_BUFFER_OFFSET (buffer);
if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer)) {
GstClockTime timestamp = GST_BUFFER_TIMESTAMP (buffer);
event = gst_event_new_discontinuous (TRUE,
GST_FORMAT_TIME, timestamp, event_type, offset, GST_FORMAT_UNDEFINED);
GST_CAT_WARNING (GST_CAT_SCHEDULING,
"needed to invent a DISCONT %p (time %" G_GUINT64_FORMAT
") for %s:%s => %s:%s", event, timestamp,
GST_DEBUG_PAD_NAME (GST_PAD_PEER (pad)), GST_DEBUG_PAD_NAME (pad));
} else {
event = gst_event_new_discontinuous (TRUE,
event_type, offset, GST_FORMAT_UNDEFINED);
GST_CAT_WARNING (GST_CAT_SCHEDULING,
"needed to invent a DISCONT %p (no time) for %s:%s => %s:%s", event,
GST_DEBUG_PAD_NAME (GST_PAD_PEER (pad)), GST_DEBUG_PAD_NAME (pad));
}
return GST_DATA (event);
}
/**
* gst_pad_push:
* @pad: a source #GstPad.
* @data: the #GstData to push.
*
* Pushes a buffer or an event to the peer of @pad. @pad must be linked. May
* only be called by @pad's parent.
*/
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);
DEBUG_DATA (pad, data, "gst_pad_push");
if (!gst_probe_dispatcher_dispatch (&(GST_REAL_PAD (pad)->probedisp), &data))
return;
if (!GST_PAD_IS_LINKED (pad)) {
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
"not pushing data %p as pad is unconnected", data);
gst_data_unref (data);
return;
}
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, 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_SCHEDULING, 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 sink #GstPad.
*
* Pulls an event or a buffer from the peer pad. May only be called by @pad's
* parent.
*
* Returns: a new #GstData from the peer pad.
*/
GstData *
gst_pad_pull (GstPad * pad)
{
GstRealPad *peer;
GstData *data;
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) {
GstPadLink *link = GST_RPAD_LINK (pad);
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
"calling gethandler %s of peer pad %s:%s",
GST_DEBUG_FUNCPTR_NAME (peer->gethandler), GST_DEBUG_PAD_NAME (peer));
if (link->temp_store) {
g_assert (link->engaged);
GST_DEBUG ("moving temp_store %p to data", link->temp_store);
data = link->temp_store;
link->temp_store = NULL;
} else {
data = (peer->gethandler) (GST_PAD (peer));
/* refetch - we might have been relinked */
link = GST_RPAD_LINK (pad);
peer = GST_RPAD_PEER (pad);
}
if (data) {
if (!link->engaged) {
g_assert (link->temp_store == NULL);
if (GST_IS_BUFFER (data)) {
GST_DEBUG ("moving data buffer %p back to temp_store", data);
link->temp_store = data;
link->engaged = TRUE;
data = _invent_event (pad, GST_BUFFER (data));
} else if (GST_IS_EVENT (data) &&
GST_EVENT_TYPE (data) == GST_EVENT_DISCONTINUOUS &&
GST_EVENT_DISCONT_NEW_MEDIA (data)) {
link->engaged = TRUE;
GST_CAT_LOG (GST_CAT_SCHEDULING,
"link engaged by discont event %p for pad %s:%s", data,
GST_DEBUG_PAD_NAME (pad));
}
}
GST_DEBUG ("calling gst_probe_dispatcher_dispatch on data %p", data);
if (!gst_probe_dispatcher_dispatch (&peer->probedisp, &data))
goto restart;
DEBUG_DATA (pad, data, "gst_pad_pull returned");
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)));
}
}
data = GST_DATA (gst_event_new (GST_EVENT_INTERRUPT));
DEBUG_DATA (pad, data, "gst_pad_pull returned created");
return data;
}
GstData *
gst_pad_collect_array (GstScheduler * scheduler, GstPad ** selected,
GstPad ** padlist)
{
GstSchedulerClass *klass = GST_SCHEDULER_GET_CLASS (scheduler);
if (!GST_FLAG_IS_SET (scheduler, GST_SCHEDULER_FLAG_NEW_API) ||
!klass->pad_select) {
/* better randomness? */
if (selected)
*selected = padlist[0];
return gst_pad_pull (padlist[0]);
} else {
GstPad *select;
return klass->pad_select (scheduler, selected ? selected : &select,
padlist);
}
}
/**
* gst_pad_collectv:
* @selected: set to the pad the buffer comes from if not NULL
* @padlist: a #GList of sink pads.
*
* Waits for a buffer on any of the list of pads. Each #GstPad in @padlist must
* belong to the same element and be owned by the caller.
*
* Returns: the #GstData that was available
*/
GstData *
gst_pad_collectv (GstPad ** selected, const GList * padlist)
{
/* need to use alloca here because we must not leak data */
GstPad **pads;
GstPad *test;
GstElement *element = NULL;
int i = 0;
g_return_val_if_fail (padlist != NULL, NULL);
pads = g_alloca (sizeof (gpointer) * (g_list_length ((GList *) padlist) + 1));
for (; padlist; padlist = g_list_next (padlist)) {
test = GST_PAD (padlist->data);
g_return_val_if_fail (GST_IS_PAD (test), NULL);
g_return_val_if_fail (GST_PAD_IS_SINK (test), NULL);
if (element) {
g_return_val_if_fail (element == gst_pad_get_parent (test), NULL);
} else {
element = gst_pad_get_parent (test);
}
pads[i++] = test;
}
pads[i] = NULL;
return gst_pad_collect_array (GST_SCHEDULER (element), selected, pads);
}
/**
* gst_pad_collect:
* @selected: set to the pad the buffer comes from if not NULL
* @pad: first pad
* @...: more sink pads.
*
* Waits for a buffer on the given set of pads.
*
* Returns: the #GstData that was available.
*/
GstData *
gst_pad_collect (GstPad ** selected, GstPad * pad, ...)
{
GstData *result;
va_list var_args;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
va_start (var_args, pad);
result = gst_pad_collect_valist (selected, pad, var_args);
va_end (var_args);
return result;
}
/**
* gst_pad_collect_valist:
* @selected: set to the pad the buffer comes from if not NULL
* @pad: first pad
* @...: more sink pads.
*
* Waits for a buffer on the given set of pads.
*
* Returns: the #GstData that was available.
*/
GstData *
gst_pad_collect_valist (GstPad ** selected, GstPad * pad, va_list var_args)
{
GstPad **padlist;
GstElement *element = NULL;
gint i = 0, maxlength;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
element = gst_pad_get_parent (pad);
maxlength = element->numsinkpads;
/* can we make this list a bit smaller than this upper limit? */
padlist = g_alloca (sizeof (gpointer) * (maxlength + 1));
while (pad) {
g_return_val_if_fail (i < maxlength, NULL);
g_return_val_if_fail (element == gst_pad_get_parent (pad), NULL);
padlist[i++] = pad;
pad = va_arg (var_args, GstPad *);
}
return gst_pad_collect_array (GST_SCHEDULER (element), selected, padlist);
}
/**
* gst_pad_selectv:
* @padlist: a #GList of sink pads.
*
* Waits for a buffer on any of the list of pads. Each #GstPad in @padlist must
* be owned by the calling code.
*
* Returns: the #GstPad that has a buffer available.
* Use #gst_pad_pull() to get the buffer.
*/
GstPad *
gst_pad_selectv (GList * padlist)
{
return NULL;
}
/**
* 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;
}
/**
* gst_pad_select:
* @pad: a first sink #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;
}
/************************************************************************
*
* 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),
0,
(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);
g_return_val_if_fail (caps != 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_caps_do_simplify (caps);
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. If you need to keep a reference to
* the caps, make a copy (see gst_caps_copy ()).
*/
const GstCaps *
gst_pad_template_get_caps (GstPadTemplate * templ)
{
g_return_val_if_fail (GST_IS_PAD_TEMPLATE (templ), 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 void gst_ghost_pad_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_ghost_pad_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static GstPad *ghost_pad_parent_class = NULL;
/* static guint gst_ghost_pad_signals[LAST_SIGNAL] = { 0 }; */
enum
{
GPAD_ARG_0,
GPAD_ARG_REAL_PAD
/* fill me */
};
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),
0,
(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);
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_ghost_pad_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_ghost_pad_get_property);
g_object_class_install_property (gobject_class, GPAD_ARG_REAL_PAD,
g_param_spec_object ("real-pad", "Real pad",
"The real pad for the ghost pad", GST_TYPE_PAD, G_PARAM_READWRITE));
}
static void
gst_ghost_pad_init (GstGhostPad * pad)
{
/* zeroed by glib */
}
static void
gst_ghost_pad_dispose (GObject * object)
{
g_object_set (object, "real-pad", NULL, NULL);
G_OBJECT_CLASS (ghost_pad_parent_class)->dispose (object);
}
static void
gst_ghost_pad_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstPad *ghostpad = (GstPad *) object;
GstPad *oldrealpad = (GstPad *) GST_GPAD_REALPAD (ghostpad);
GstPad *realpad = NULL;
switch (prop_id) {
case GPAD_ARG_REAL_PAD:
realpad = g_value_get_object (value);
if (oldrealpad) {
if (realpad == oldrealpad)
return;
else
gst_pad_remove_ghost_pad (oldrealpad, ghostpad);
}
if (realpad)
gst_pad_add_ghost_pad (realpad, ghostpad);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_ghost_pad_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
switch (prop_id) {
case GPAD_ARG_REAL_PAD:
g_value_set_object (value, GST_GPAD_REALPAD (object));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/**
* 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 @pad, and named @name. If @name is
* %NULL, a guaranteed unique name (across all ghost pads) will be assigned.
*
* Returns: a new ghost #GstPad, or %NULL in case of an error.
*/
GstPad *
gst_ghost_pad_new (const gchar * name, GstPad * pad)
{
GstPad *gpad;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
gpad = g_object_new (GST_TYPE_GHOST_PAD, "name", name, "real-pad", pad, NULL);
GST_CAT_DEBUG (GST_CAT_PADS, "created ghost pad \"%s\" for pad %s:%s",
GST_OBJECT_NAME (gpad), GST_DEBUG_PAD_NAME (pad));
return gpad;
}
/**
* 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;
GST_INFO_OBJECT (pad, "Sending event %p to all internally linked pads",
event);
orig = pads = gst_pad_get_internal_links (pad);
while (pads) {
GstPad *eventpad = GST_PAD (pads->data);
pads = g_list_next (pads);
/* for all of the internally-linked pads that are actually linked */
if (GST_PAD_IS_LINKED (eventpad)) {
if (GST_PAD_DIRECTION (eventpad) == GST_PAD_SRC) {
/* for each pad we send to, we should ref the event; it's up
* to downstream to unref again when handled. */
GST_LOG_OBJECT (pad, "Reffing and sending event %p to %s:%s", event,
GST_DEBUG_PAD_NAME (eventpad));
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);
GST_LOG_OBJECT (pad, "sending event %p to one sink pad %s:%s", event,
GST_DEBUG_PAD_NAME (eventpad));
return gst_pad_send_event (peerpad, event);
}
}
}
/* we handled the incoming event so we unref once */
GST_LOG_OBJECT (pad, "handled event %p, unreffing", 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. End-of-stream and
* discontinuity events are handled specially, and then the event is sent to all
* pads internally linked to @pad. Note that if there are many possible sink
* pads that are internally linked to @pad, only one will be sent an event.
* Multi-sinkpad elements should implement custom event handlers.
*
* 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 != NULL, 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_element_requires_clock (element) && element->clock) {
if (gst_event_discont_get_value (event, GST_FORMAT_TIME, &time)) {
gst_element_set_time (element, time);
} else {
GstFormat format = GST_FORMAT_TIME;
guint i;
for (i = 0; i < event->event_data.discont.noffsets; i++) {
if (gst_pad_convert (pad,
event->event_data.discont.offsets[i].format,
event->event_data.discont.offsets[i].value, &format,
&time)) {
gst_element_set_time (element, time);
} else if (i == event->event_data.discont.noffsets) {
g_warning
("can't adjust clock to new time when time not provided");
}
}
}
}
}
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 (dispatch != NULL, 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;
GstElement *parent;
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
g_return_val_if_fail (event != NULL, FALSE);
parent = gst_pad_get_parent (pad);
g_return_val_if_fail (GST_STATE (parent) >= GST_STATE_PAUSED, 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 type %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 != NULL, FALSE);
g_return_val_if_fail (dest_value != NULL, 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 != NULL, FALSE);
g_return_val_if_fail (dest_value != NULL, 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 != NULL, FALSE);
g_return_val_if_fail (value != NULL, 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 != NULL, FALSE);
g_return_val_if_fail (value != NULL, 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;
g_return_val_if_fail (GST_IS_PAD (pad), 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), NULL);
rpad = GST_PAD_REALIZE (pad);
if (GST_RPAD_FORMATSFUNC (rpad))
return GST_RPAD_FORMATSFUNC (rpad) (GST_PAD (pad));
return NULL;
}
#define CALL_CHAINFUNC(pad, data) G_STMT_START {\
GstData *__temp = (data); \
DEBUG_DATA (pad, __temp, "calling chain function with "); \
if (GST_IS_EVENT (__temp) && \
!GST_FLAG_IS_SET (gst_pad_get_parent (pad), GST_ELEMENT_EVENT_AWARE)) { \
gst_pad_send_event (pad, GST_EVENT (__temp)); \
} else { \
GST_RPAD_CHAINFUNC (pad) (pad, __temp); \
} \
}G_STMT_END
/**
* gst_pad_call_chain_function:
* @pad: sink pad to call chain function on
* @data: data to call the chain function with
*
* Calls the chain function of the given pad while making sure the internal
* consistency is kept. Use this function inside schedulers instead of calling
* the chain function yourself.
*/
void
gst_pad_call_chain_function (GstPad * pad, GstData * data)
{
GstPadLink *link;
g_return_if_fail (GST_IS_REAL_PAD (pad));
g_return_if_fail (GST_PAD_IS_SINK (pad));
g_return_if_fail (data != NULL);
g_return_if_fail (GST_RPAD_CHAINFUNC (pad) != NULL);
g_return_if_fail (GST_RPAD_LINK (pad) != NULL);
link = GST_RPAD_LINK (pad);
if (!link->engaged) {
g_assert (link->temp_store == NULL);
if (GST_IS_BUFFER (data)) {
GST_DEBUG ("moving data buffer %p back to temp_store", data);
link->temp_store = data;
link->engaged = TRUE;
CALL_CHAINFUNC (pad, _invent_event (pad, GST_BUFFER (data)));
link = GST_RPAD_LINK (pad);
if (link->temp_store == NULL) /* happens after relinking in chainfunc */
return;
g_assert (link->temp_store == data);
link->temp_store = NULL;
} else if (GST_IS_EVENT (data) &&
GST_EVENT_TYPE (data) == GST_EVENT_DISCONTINUOUS &&
GST_EVENT_DISCONT_NEW_MEDIA (data)) {
link->engaged = TRUE;
GST_CAT_LOG (GST_CAT_SCHEDULING,
"link engaged by discont event %p for pad %s:%s", data,
GST_DEBUG_PAD_NAME (pad));
}
}
CALL_CHAINFUNC (pad, data);
}
/**
* gst_pad_call_get_function:
* @pad: sink pad to call chain function on
*
* Calls the get function of the given pad while making sure the internal
* consistency is kept. Use this function inside schedulers instead of calling
* the get function yourself.
*
* Returns: the data provided by the pad or NULL if no data was available.
*/
GstData *
gst_pad_call_get_function (GstPad * pad)
{
GstData *data;
g_return_val_if_fail (GST_IS_REAL_PAD (pad), NULL);
g_return_val_if_fail (GST_PAD_IS_SRC (pad), NULL);
g_return_val_if_fail (GST_RPAD_GETFUNC (pad) != NULL, NULL);
data = GST_RPAD_GETFUNC (pad) (pad);
DEBUG_DATA (pad, data, "getfunction returned");
return data;
}
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