/* GStreamer * Copyright (C) 1999,2000 Erik Walthinsen * 2000 Wim Taymans * * 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. */ /* #define GST_DEBUG_ENABLED */ #include "gst_private.h" #include "gstpad.h" #include "gstutils.h" #include "gstelement.h" #include "gsttype.h" #include "gstbin.h" #include "gstscheduler.h" #include "gstevent.h" #include "gstlog.h" enum { TEMPL_PAD_CREATED, /* FILL ME */ TEMPL_LAST_SIGNAL }; static GstObject *padtemplate_parent_class = NULL; static guint gst_pad_template_signals[TEMPL_LAST_SIGNAL] = { 0 }; GType _gst_pad_type = 0; /***** Start with the base GstPad class *****/ static void gst_pad_class_init (GstPadClass *klass); static void gst_pad_init (GstPad *pad); static void gst_pad_dispose (GObject *object); static gboolean gst_pad_try_relink_filtered_func (GstRealPad *srcpad, GstRealPad *sinkpad, GstCaps *caps, gboolean clear); static void gst_pad_set_pad_template (GstPad *pad, GstPadTemplate *templ); #ifndef GST_DISABLE_LOADSAVE static xmlNodePtr gst_pad_save_thyself (GstObject *object, xmlNodePtr parent); #endif static GstObject *pad_parent_class = NULL; GType gst_pad_get_type (void) { if (!_gst_pad_type) { static const GTypeInfo pad_info = { sizeof (GstPadClass), NULL, NULL, (GClassInitFunc) gst_pad_class_init, NULL, NULL, sizeof (GstPad), 32, (GInstanceInitFunc) gst_pad_init, NULL }; _gst_pad_type = g_type_register_static (GST_TYPE_OBJECT, "GstPad", &pad_info, 0); } return _gst_pad_type; } static void gst_pad_class_init (GstPadClass *klass) { GObjectClass *gobject_class; gobject_class = (GObjectClass*) klass; pad_parent_class = g_type_class_ref (GST_TYPE_OBJECT); gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_pad_dispose); } static void gst_pad_init (GstPad *pad) { /* all structs are initialized to NULL by glib */ } static void gst_pad_dispose (GObject *object) { GstPad *pad = GST_PAD (object); gst_pad_set_pad_template (pad, NULL); G_OBJECT_CLASS (pad_parent_class)->dispose (object); } /***** Then do the Real Pad *****/ /* Pad signals and args */ enum { REAL_CAPS_NEGO_FAILED, REAL_LINKED, REAL_UNLINKED, /* 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 void gst_real_pad_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec); static void gst_real_pad_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec); GType _gst_real_pad_type = 0; static GstPad *real_pad_parent_class = NULL; static guint gst_real_pad_signals[REAL_LAST_SIGNAL] = { 0 }; GType gst_real_pad_get_type (void) { if (!_gst_real_pad_type) { static const GTypeInfo pad_info = { sizeof (GstRealPadClass), NULL, NULL, (GClassInitFunc) gst_real_pad_class_init, NULL, NULL, sizeof (GstRealPad), 32, (GInstanceInitFunc) gst_real_pad_init, NULL }; _gst_real_pad_type = g_type_register_static (GST_TYPE_PAD, "GstRealPad", &pad_info, 0); } return _gst_real_pad_type; } static void gst_real_pad_class_init (GstRealPadClass *klass) { GObjectClass *gobject_class; GstObjectClass *gstobject_class; gobject_class = (GObjectClass*) klass; gstobject_class = (GstObjectClass*) klass; real_pad_parent_class = g_type_class_ref (GST_TYPE_PAD); gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_real_pad_dispose); gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_real_pad_set_property); gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_real_pad_get_property); gst_real_pad_signals[REAL_CAPS_NEGO_FAILED] = g_signal_new ("caps_nego_failed", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRealPadClass, caps_nego_failed), NULL, NULL, gst_marshal_VOID__POINTER, G_TYPE_NONE, 1, G_TYPE_POINTER); gst_real_pad_signals[REAL_LINKED] = g_signal_new ("linked", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRealPadClass, linked), NULL, NULL, gst_marshal_VOID__POINTER, G_TYPE_NONE, 1, G_TYPE_POINTER); 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__POINTER, G_TYPE_NONE, 1, G_TYPE_POINTER); /* gtk_object_add_arg_type ("GstRealPad::active", G_TYPE_BOOLEAN, */ /* GTK_ARG_READWRITE, REAL_ARG_ACTIVE); */ g_object_class_install_property (G_OBJECT_CLASS (klass), REAL_ARG_ACTIVE, g_param_spec_boolean ("active", "Active", "Whether the pad is active.", TRUE, G_PARAM_READWRITE)); 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 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->bufferpoolfunc = NULL; pad->ghostpads = NULL; pad->caps = NULL; pad->linkfunc = NULL; pad->getcapsfunc = NULL; pad->convertfunc = gst_pad_convert_default; pad->eventfunc = gst_pad_event_default; pad->convertfunc = gst_pad_convert_default; pad->queryfunc = gst_pad_query_default; pad->intlinkfunc = gst_pad_get_internal_links_default; pad->eventmaskfunc = gst_pad_get_event_masks_default; pad->formatsfunc = gst_pad_get_formats_default; pad->querytypefunc = gst_pad_get_query_types_default; GST_FLAG_SET (pad, GST_PAD_DISABLED); GST_FLAG_UNSET (pad, GST_PAD_NEGOTIATING); gst_probe_dispatcher_init (&pad->probedisp); } static void gst_real_pad_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { g_return_if_fail (GST_IS_PAD (object)); switch (prop_id) { case REAL_ARG_ACTIVE: gst_pad_set_active (GST_PAD (object), g_value_get_boolean (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_real_pad_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { g_return_if_fail (GST_IS_PAD (object)); switch (prop_id) { case REAL_ARG_ACTIVE: g_value_set_boolean (value, !GST_FLAG_IS_SET (object, GST_PAD_DISABLED)); break; case REAL_ARG_CAPS: g_value_set_boxed (value, GST_PAD_CAPS (GST_REAL_PAD (object))); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } /** * gst_pad_custom_new: * @type: the #Gtype of the pad. * @name: the name of the new pad. * @direction: the #GstPadDirection of the pad. * * Creates a new pad with the given name and type in the given direction. * If name is NULL, a guaranteed unique name (across all pads) * will be assigned. * * Returns: a new #GstPad, or NULL in case of an error. */ GstPad* gst_pad_custom_new (GType type, const gchar *name, GstPadDirection direction) { GstRealPad *pad; g_return_val_if_fail (direction != GST_PAD_UNKNOWN, NULL); pad = g_object_new (type, NULL); gst_object_set_name (GST_OBJECT (pad), name); GST_RPAD_DIRECTION (pad) = direction; return GST_PAD (pad); } /** * gst_pad_new: * @name: the name of the new pad. * @direction: the #GstPadDirection of the pad. * * Creates a new real pad with the given name in the given direction. * If name is NULL, a guaranteed unique name (across all pads) * will be assigned. * * Returns: a new #GstPad, or NULL in case of an error. */ GstPad* gst_pad_new (const gchar *name, GstPadDirection direction) { return gst_pad_custom_new (gst_real_pad_get_type (), name, direction); } /** * gst_pad_custom_new_from_template: * @type: the custom #GType of the pad. * @templ: the #GstPadTemplate to instantiate from. * @name: the name of the new pad. * * Creates a new custom pad with the given name from the given template. * If name is NULL, a guaranteed unique name (across all pads) * will be assigned. * * Returns: a new #GstPad, or NULL in case of an error. */ GstPad* gst_pad_custom_new_from_template (GType type, GstPadTemplate *templ, const gchar *name) { GstPad *pad; g_return_val_if_fail (templ != NULL, NULL); pad = gst_pad_new (name, templ->direction); gst_pad_set_pad_template (pad, templ); return pad; } /** * gst_pad_new_from_template: * @templ: the pad template to use * @name: the name of the element * * Creates a new real pad with the given name from the given template. * If name is NULL, a guaranteed unique name (across all pads) * will be assigned. * * Returns: a new #GstPad, or NULL in case of an error. */ GstPad* gst_pad_new_from_template (GstPadTemplate *templ, const gchar *name) { return gst_pad_custom_new_from_template (gst_real_pad_get_type (), templ, name); } /** * gst_pad_get_direction: * @pad: a #GstPad to get the direction of. * * Gets the direction of the pad. * * Returns: the #GstPadDirection of the pad. */ GstPadDirection gst_pad_get_direction (GstPad *pad) { g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_UNKNOWN); return GST_PAD_DIRECTION (pad); } /** * gst_pad_set_active: * @pad: the #GstPad to activate or deactivate. * @active: TRUE to activate the pad. * * Activates or deactivates the given pad. */ void gst_pad_set_active (GstPad *pad, gboolean active) { GstRealPad *realpad; gboolean old; g_return_if_fail (GST_IS_PAD (pad)); old = GST_PAD_IS_ACTIVE (pad); if (old == active) return; realpad = GST_PAD_REALIZE (pad); if (active) { GST_DEBUG (GST_CAT_PADS, "activating pad %s:%s", GST_DEBUG_PAD_NAME (realpad)); GST_FLAG_UNSET (realpad, GST_PAD_DISABLED); } else { GST_DEBUG (GST_CAT_PADS, "de-activating pad %s:%s", GST_DEBUG_PAD_NAME (realpad)); GST_FLAG_SET (realpad, GST_PAD_DISABLED); } if (old != active) g_object_notify (G_OBJECT (realpad), "active"); } /** * gst_pad_is_active: * @pad: the #GstPad to query * * Query if a pad is active * * Returns: TRUE if the pad is active. */ gboolean gst_pad_is_active (GstPad *pad) { g_return_val_if_fail (GST_IS_PAD (pad), FALSE); return !GST_FLAG_IS_SET (pad, GST_PAD_DISABLED); } /** * gst_pad_set_name: * @pad: a #GstPad to set the name of. * @name: the name of the pad. * * Sets the name of a pad. If name is NULL, then a guaranteed unique * name will be assigned. */ void gst_pad_set_name (GstPad *pad, const gchar *name) { g_return_if_fail (GST_IS_PAD (pad)); gst_object_set_name (GST_OBJECT (pad), name); } /** * gst_pad_get_name: * @pad: a #GstPad to get the name of. * * Gets the name of a pad. * * Returns: the name of the pad. This is not a newly allocated pointer * so you must not free it. */ const gchar* gst_pad_get_name (GstPad *pad) { g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); return GST_OBJECT_NAME (pad); } /** * gst_pad_set_chain_function: * @pad: a #GstPad to set the chain function for. * @chain: the #GstPadChainFunction to set. * * Sets the given chain function for the pad. */ void gst_pad_set_chain_function (GstPad *pad, GstPadChainFunction chain) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_CHAINFUNC (pad) = chain; GST_DEBUG (GST_CAT_PADS, "chainfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (chain)); } /** * gst_pad_set_get_function: * @pad: a #GstPad to set the get function for. * @get: the #GstPadGetFunction to set. * * Sets the given get function for the pad. */ void gst_pad_set_get_function (GstPad *pad, GstPadGetFunction get) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_GETFUNC (pad) = get; GST_DEBUG (GST_CAT_PADS, "getfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (get)); } /** * gst_pad_set_event_function: * @pad: a #GstPad to set the event handler for. * @event: the #GstPadEventFunction to set. * * Sets the given event handler for the pad. */ void gst_pad_set_event_function (GstPad *pad, GstPadEventFunction event) { g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_EVENTFUNC (pad) = event; GST_DEBUG (GST_CAT_PADS, "eventfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (event)); } /** * gst_pad_set_event_mask_function: * @pad: a #GstPad to set the event mask function for. * @mask_func: the #GstPadEventMaskFunction to set. * * Sets the given event mask function for the pad. */ void gst_pad_set_event_mask_function (GstPad *pad, GstPadEventMaskFunction mask_func) { g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_EVENTMASKFUNC (pad) = mask_func; GST_DEBUG (GST_CAT_PADS, "eventmaskfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (mask_func)); } /** * gst_pad_get_event_masks: * @pad: a #GstPad to get the event mask for. * * Gets the array of eventmasks from the given pad. * * Returns: an array with eventmasks, the list is ended * with 0 */ const GstEventMask* gst_pad_get_event_masks (GstPad *pad) { GstRealPad *rpad; if (pad == NULL) return FALSE; rpad = GST_PAD_REALIZE (pad); g_return_val_if_fail (rpad, FALSE); if (GST_RPAD_EVENTMASKFUNC (rpad)) return GST_RPAD_EVENTMASKFUNC (rpad) (GST_PAD_CAST (pad)); return NULL; } static gboolean gst_pad_get_event_masks_dispatcher (GstPad *pad, const GstEventMask **data) { *data = gst_pad_get_event_masks (pad); return TRUE; } /** * gst_pad_get_event_masks_default: * @pad: a #GstPad to get the event mask for. * * Invokes the default event masks dispatcher on the pad. * * Returns: an array with eventmasks, the list is ended * with 0 */ const GstEventMask* gst_pad_get_event_masks_default (GstPad *pad) { GstEventMask *result = NULL; gst_pad_dispatcher (pad, (GstPadDispatcherFunction) gst_pad_get_event_masks_dispatcher, &result); return result; } /** * gst_pad_set_convert_function: * @pad: a #GstPad to set the convert function for. * @convert: the #GstPadConvertFunction to set. * * Sets the given convert function for the pad. */ void gst_pad_set_convert_function (GstPad *pad, GstPadConvertFunction convert) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_CONVERTFUNC (pad) = convert; GST_DEBUG (GST_CAT_PADS, "convertfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (convert)); } /** * gst_pad_set_query_function: * @pad: the #GstPad to set the query function for. * @query: the #GstPadQueryFunction to set. * * Set the given query function for the pad. */ void gst_pad_set_query_function (GstPad *pad, GstPadQueryFunction query) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_QUERYFUNC (pad) = query; GST_DEBUG (GST_CAT_PADS, "queryfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (query)); } /** * gst_pad_set_query_type_function: * @pad: the #GstPad to set the query type function for. * @type_func: the #GstPadQueryTypeFunction to set. * * Set the given query type function for the pad. */ void gst_pad_set_query_type_function (GstPad *pad, GstPadQueryTypeFunction type_func) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_QUERYTYPEFUNC (pad) = type_func; GST_DEBUG (GST_CAT_PADS, "querytypefunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (type_func)); } /** * gst_pad_get_query_types: * @pad: the #GstPad to query * * Get an array of supported queries that can be performed * on this pad. * * Returns: an array of querytypes anded with 0. */ const GstQueryType* gst_pad_get_query_types (GstPad *pad) { GstRealPad *rpad; if (pad == NULL) return FALSE; rpad = GST_PAD_REALIZE (pad); g_return_val_if_fail (rpad, FALSE); if (GST_RPAD_QUERYTYPEFUNC (rpad)) return GST_RPAD_QUERYTYPEFUNC (rpad) (GST_PAD_CAST (pad)); return NULL; } static gboolean gst_pad_get_query_types_dispatcher (GstPad *pad, const GstQueryType **data) { *data = gst_pad_get_query_types (pad); return TRUE; } /** * gst_pad_get_query_types_default: * @pad: the #GstPad to query * * Invoke the default dispatcher for the query types on * the pad. * * Returns: an array of querytypes anded with 0. */ const GstQueryType* gst_pad_get_query_types_default (GstPad *pad) { GstQueryType *result = NULL; gst_pad_dispatcher (pad, (GstPadDispatcherFunction) gst_pad_get_query_types_dispatcher, &result); return result; } /** * gst_pad_set_internal_link_function: * @pad: a #GstPad to set the internal link function for. * @intlink: the #GstPadIntLinkFunction to set. * * Sets the given internal link function for the pad. */ void gst_pad_set_internal_link_function (GstPad *pad, GstPadIntLinkFunction intlink) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_INTLINKFUNC (pad) = intlink; GST_DEBUG (GST_CAT_PADS, "internal link for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (intlink)); } /** * gst_pad_set_formats_function: * @pad: the #GstPad to set the formats function for. * @formats: the #GstPadFormatsFunction to set. * * Sets the given formats function for the pad. */ void gst_pad_set_formats_function (GstPad *pad, GstPadFormatsFunction formats) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_FORMATSFUNC (pad) = formats; GST_DEBUG (GST_CAT_PADS, "formats function for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (formats)); } /** * gst_pad_set_link_function: * @pad: a #GstPad to set the link function for. * @link: the #GstPadLinkFunction to set. * * Sets the given link function for the pad. It will be called * when the pad is linked or relinked with caps. */ void gst_pad_set_link_function (GstPad *pad, GstPadLinkFunction link) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_LINKFUNC (pad) = link; GST_DEBUG (GST_CAT_PADS, "linkfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (link)); } /** * gst_pad_set_getcaps_function: * @pad: a #GstPad to set the getcaps function for. * @getcaps: the #GstPadGetCapsFunction to set. * * Sets the given getcaps function for the pad. */ void gst_pad_set_getcaps_function (GstPad *pad, GstPadGetCapsFunction getcaps) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_GETCAPSFUNC (pad) = getcaps; GST_DEBUG (GST_CAT_PADS, "getcapsfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (getcaps)); } /** * gst_pad_set_bufferpool_function: * @pad: a #GstPad to set the bufferpool function for. * @bufpool: the #GstPadBufferPoolFunction to set. * * Sets the given bufferpool function for the pad. Note that the * bufferpool function can only be set on sinkpads. */ void gst_pad_set_bufferpool_function (GstPad *pad, GstPadBufferPoolFunction bufpool) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); g_return_if_fail (GST_PAD_IS_SINK (pad)); GST_RPAD_BUFFERPOOLFUNC (pad) = bufpool; GST_DEBUG (GST_CAT_PADS, "bufferpoolfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (bufpool)); } /** * gst_pad_unlink: * @srcpad: the source #GstPad to unlink. * @sinkpad: the sink #GstPad to unlink. * * Unlinks the source pad from the sink pad. */ void gst_pad_unlink (GstPad *srcpad, GstPad *sinkpad) { GstRealPad *realsrc, *realsink; GstScheduler *src_sched, *sink_sched; /* generic checks */ g_return_if_fail (srcpad != NULL); g_return_if_fail (GST_IS_PAD (srcpad)); g_return_if_fail (sinkpad != NULL); g_return_if_fail (GST_IS_PAD (sinkpad)); GST_INFO (GST_CAT_ELEMENT_PADS, "unlinking %s:%s(%p) and %s:%s(%p)", GST_DEBUG_PAD_NAME (srcpad), srcpad, GST_DEBUG_PAD_NAME (sinkpad), sinkpad); /* now we need to deal with the real/ghost stuff */ realsrc = GST_PAD_REALIZE (srcpad); realsink = GST_PAD_REALIZE (sinkpad); g_return_if_fail (GST_RPAD_PEER (realsrc) != NULL); g_return_if_fail (GST_RPAD_PEER (realsink) == realsrc); if ((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SINK) && (GST_RPAD_DIRECTION (realsink) == GST_PAD_SRC)) { GstRealPad *temppad; temppad = realsrc; realsrc = realsink; realsink = temppad; } g_return_if_fail ((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SRC) && (GST_RPAD_DIRECTION (realsink) == GST_PAD_SINK)); /* get the schedulers before we unlink */ src_sched = gst_pad_get_scheduler (GST_PAD_CAST (realsrc)); sink_sched = gst_pad_get_scheduler (GST_PAD_CAST (realsink)); /* first clear peers */ GST_RPAD_PEER (realsrc) = NULL; GST_RPAD_PEER (realsink) = NULL; /* reset the filters, both filters are refcounted once */ if (GST_RPAD_FILTER (realsrc)) { gst_caps_replace (&GST_RPAD_FILTER (realsink), NULL); gst_caps_replace (&GST_RPAD_FILTER (realsrc), NULL); } /* now tell the scheduler */ if (src_sched && src_sched == sink_sched) { gst_scheduler_pad_unlink (src_sched, GST_PAD_CAST (realsrc), GST_PAD_CAST (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_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)); } 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_CAST (realsrc)); sink_sched = gst_pad_get_scheduler (GST_PAD_CAST (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; } /** * gst_pad_can_link_filtered: * @srcpad: the source #GstPad to link. * @sinkpad: the sink #GstPad to link. * @filtercaps: the filter #GstCaps. * * Checks if the source pad and the sink pad can be linked when constrained * by the given filter caps. * * Returns: TRUE if the pads can be linked, FALSE otherwise. */ gboolean gst_pad_can_link_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps *filtercaps) { GstRealPad *realsrc, *realsink; /* generic checks */ g_return_val_if_fail (srcpad != NULL, FALSE); g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE); g_return_val_if_fail (sinkpad != NULL, FALSE); g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE); /* now we need to deal with the real/ghost stuff */ realsrc = GST_PAD_REALIZE (srcpad); realsink = GST_PAD_REALIZE (sinkpad); g_return_val_if_fail (GST_RPAD_PEER (realsrc) == NULL, FALSE); g_return_val_if_fail (GST_RPAD_PEER (realsink) == NULL, FALSE); g_return_val_if_fail (GST_PAD_PARENT (realsrc) != NULL, FALSE); g_return_val_if_fail (GST_PAD_PARENT (realsink) != NULL, FALSE); if (!gst_pad_check_schedulers (realsrc, realsink)) { g_warning ("linking pads with different scheds requires " "exactly one decoupled element (queue)"); return FALSE; } /* check if the directions are compatible */ if (!(((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SINK) && (GST_RPAD_DIRECTION (realsink) == GST_PAD_SRC)) || ((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SRC) && (GST_RPAD_DIRECTION (realsink) == GST_PAD_SINK)))) return FALSE; return TRUE; } /** * gst_pad_can_link: * @srcpad: the source #GstPad to link. * @sinkpad: the sink #GstPad to link. * * Checks if the source pad and the sink pad can be link. * * Returns: TRUE if the pads can be linked, FALSE otherwise. */ gboolean gst_pad_can_link (GstPad *srcpad, GstPad *sinkpad) { return gst_pad_can_link_filtered (srcpad, sinkpad, NULL); } /** * gst_pad_link_filtered: * @srcpad: the source #GstPad to link. * @sinkpad: the sink #GstPad to link. * @filtercaps: the filter #GstCaps. * * Links the source pad and the sink pad, constrained * by the given filter caps. This function sinks the caps. * * Returns: TRUE if the pads have been linked, FALSE otherwise. */ gboolean gst_pad_link_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps *filtercaps) { GstRealPad *realsrc, *realsink; GstScheduler *src_sched, *sink_sched; /* generic checks */ g_return_val_if_fail (srcpad != NULL, FALSE); g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE); g_return_val_if_fail (sinkpad != NULL, FALSE); g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE); GST_INFO (GST_CAT_PADS, "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_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_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_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_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_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; } /* check for reversed directions and swap if necessary */ if ((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SINK) && (GST_RPAD_DIRECTION (realsink) == GST_PAD_SRC)) { GstRealPad *temppad; temppad = realsrc; realsrc = realsink; realsink = temppad; } if (GST_RPAD_DIRECTION (realsrc) != GST_PAD_SRC) { GST_INFO (GST_CAT_PADS, "Real src pad %s:%s is not a source pad, failed", GST_DEBUG_PAD_NAME (realsrc)); return FALSE; } if (GST_RPAD_DIRECTION (realsink) != GST_PAD_SINK) { GST_INFO (GST_CAT_PADS, "Real sink pad %s:%s is not a sink pad, failed", GST_DEBUG_PAD_NAME (realsink)); return FALSE; } /* first set peers */ GST_RPAD_PEER (realsrc) = realsink; GST_RPAD_PEER (realsink) = realsrc; /* try to negotiate the pads, we don't need to clear the caps here */ if (!gst_pad_try_relink_filtered_func (realsrc, realsink, filtercaps, FALSE)) { GST_DEBUG (GST_CAT_CAPS, "relink_filtered_func failed, can't link"); GST_RPAD_PEER (realsrc) = NULL; GST_RPAD_PEER (realsink) = NULL; return FALSE; } /* fire off a signal to each of the pads telling them * that they've been linked */ g_signal_emit (G_OBJECT (realsrc), gst_real_pad_signals[REAL_LINKED], 0, realsink); g_signal_emit (G_OBJECT (realsink), gst_real_pad_signals[REAL_LINKED], 0, realsrc); src_sched = gst_pad_get_scheduler (GST_PAD_CAST (realsrc)); sink_sched = gst_pad_get_scheduler (GST_PAD_CAST (realsink)); /* now tell the scheduler */ if (src_sched && src_sched == sink_sched) { gst_scheduler_pad_link (src_sched, GST_PAD_CAST (realsrc), GST_PAD_CAST (realsink)); } else { GST_INFO (GST_CAT_PADS, "not telling link to scheduler %s:%s and %s:%s, %p %p", GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad), src_sched, sink_sched); } GST_INFO (GST_CAT_PADS, "linked %s:%s and %s:%s, successful", GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad)); return TRUE; } /** * gst_pad_link: * @srcpad: the source #GstPad to link. * @sinkpad: the sink #GstPad to link. * * Links the source pad to the sink pad. * * Returns: TRUE if the pad could be linked, FALSE otherwise. */ gboolean gst_pad_link (GstPad *srcpad, GstPad *sinkpad) { return gst_pad_link_filtered (srcpad, sinkpad, NULL); } /** * gst_pad_set_parent: * @pad: a #GstPad to set the parent of. * @parent: the new parent #GstElement. * * Sets the parent object of a pad. */ void gst_pad_set_parent (GstPad *pad, GstElement *parent) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_PAD (pad)); g_return_if_fail (GST_PAD_PARENT (pad) == NULL); g_return_if_fail (parent != NULL); g_return_if_fail (GST_IS_OBJECT (parent)); g_return_if_fail ((gpointer) pad != (gpointer) parent); gst_object_set_parent (GST_OBJECT (pad), GST_OBJECT (parent)); } /** * gst_pad_get_parent: * @pad: the #GstPad to get the parent of. * * Gets the parent object of this pad. * * Returns: the parent #GstElement. */ GstElement* gst_pad_get_parent (GstPad *pad) { g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); return GST_PAD_PARENT (pad); } static void gst_pad_set_pad_template (GstPad *pad, GstPadTemplate *templ) { /* this function would need checks if it weren't static */ gst_object_replace ((GstObject **) &pad->padtemplate, (GstObject *) templ); if (templ) g_signal_emit (G_OBJECT (templ), gst_pad_template_signals[TEMPL_PAD_CREATED], 0, pad); } /** * gst_pad_get_pad_template: * @pad: a #GstPad to get the pad template of. * * Gets the pad template object of this pad. * * Returns: the #GstPadTemplate from which this pad was instantiated. */ GstPadTemplate* gst_pad_get_pad_template (GstPad *pad) { g_return_val_if_fail (GST_IS_PAD (pad), NULL); return GST_PAD_PAD_TEMPLATE (pad); } /** * gst_pad_get_scheduler: * @pad: a #GstPad to get the scheduler of. * * Gets the scheduler of the pad. Since the pad does not * have a scheduler of its own, the scheduler of the parent * is taken. For decoupled pads, the scheduler of the peer * parent is taken. * * Returns: the #GstScheduler of the pad. */ GstScheduler* gst_pad_get_scheduler (GstPad *pad) { GstScheduler *scheduler = NULL; GstElement *parent; g_return_val_if_fail (GST_IS_PAD (pad), NULL); parent = gst_pad_get_parent (pad); if (parent) { if (GST_FLAG_IS_SET (parent, GST_ELEMENT_DECOUPLED)) { GstRealPad *peer = GST_RPAD_PEER (pad); if (peer) { scheduler = gst_element_get_scheduler (gst_pad_get_parent (GST_PAD_CAST (peer))); } } else { scheduler = gst_element_get_scheduler (parent); } } return scheduler; } /** * gst_pad_get_real_parent: * @pad: a #GstPad to get the real parent of. * * Gets the real parent object of this pad. If the pad * is a ghost pad, the actual owner of the real pad is * returned, as opposed to #gst_pad_get_parent(). * * Returns: the parent #GstElement. */ GstElement* gst_pad_get_real_parent (GstPad *pad) { g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); return GST_PAD_PARENT (GST_PAD (GST_PAD_REALIZE (pad))); } /** * gst_pad_add_ghost_pad: * @pad: a #GstPad to attach the ghost pad to. * @ghostpad: the ghost #GstPad to to the pad. * * Adds a ghost pad to a pad. */ void gst_pad_add_ghost_pad (GstPad *pad, GstPad *ghostpad) { GstRealPad *realpad; g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_PAD (pad)); g_return_if_fail (ghostpad != NULL); g_return_if_fail (GST_IS_GHOST_PAD (ghostpad)); realpad = GST_PAD_REALIZE (pad); realpad->ghostpads = g_list_prepend (realpad->ghostpads, ghostpad); } /** * gst_pad_remove_ghost_pad: * @pad: a #GstPad to remove the ghost pad from. * @ghostpad: the ghost #GstPad to remove from the pad. * * Removes a ghost pad from a pad. */ void gst_pad_remove_ghost_pad (GstPad *pad, GstPad *ghostpad) { GstRealPad *realpad; g_return_if_fail (GST_IS_PAD (pad)); g_return_if_fail (GST_IS_GHOST_PAD (ghostpad)); realpad = GST_PAD_REALIZE (pad); g_return_if_fail (GST_GPAD_REALPAD (ghostpad) == realpad); realpad->ghostpads = g_list_remove (realpad->ghostpads, ghostpad); GST_GPAD_REALPAD (ghostpad) = NULL; } /** * gst_pad_get_ghost_pad_list: * @pad: a #GstPad to get the ghost pads of. * * Gets the ghost pads of this pad. * * Returns: a #GList of ghost pads. */ GList* gst_pad_get_ghost_pad_list (GstPad *pad) { g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); return GST_PAD_REALIZE(pad)->ghostpads; } /* an internal caps negotiation helper function: * * 1. optionally calls the pad link function with the provided caps * 2. deals with the result code of the link function * 3. sets fixed caps on the pad. */ static GstPadLinkReturn gst_pad_try_set_caps_func (GstRealPad *pad, GstCaps *caps, gboolean notify) { GstCaps *allowed = NULL; GstPadTemplate *template; GstElement *parent = GST_PAD_PARENT (pad); g_return_val_if_fail (pad != NULL, GST_PAD_LINK_REFUSED); g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_LINK_REFUSED); /* if this pad has a parent and the parent is not READY, delay the * negotiation */ if (parent && GST_STATE (parent) < GST_STATE_READY) { GST_DEBUG (GST_CAT_CAPS, "parent %s of pad %s:%s is not READY", GST_ELEMENT_NAME (parent), GST_DEBUG_PAD_NAME (pad)); return GST_PAD_LINK_DELAYED; } GST_INFO (GST_CAT_CAPS, "trying to set caps %p on pad %s:%s", caps, GST_DEBUG_PAD_NAME (pad)); /* first see if we have to check against a filter, we ref the caps here as we're * going to unref it later on */ if (!(allowed = gst_caps_ref (GST_RPAD_FILTER (pad)))) { /* no filter, make sure we check against the padtemplate then */ if ((template = gst_pad_get_pad_template (GST_PAD_CAST (pad)))) { allowed = gst_pad_template_get_caps (template); } } /* do we have to check the caps against something? */ if (allowed) { GstCaps *intersection; /* check against calculated caps */ intersection = gst_caps_intersect (caps, allowed); /* oops, empty intersection, caps don"t have anything in common */ if (!intersection) { GST_INFO (GST_CAT_CAPS, "caps did not intersect with %s:%s's allowed caps", GST_DEBUG_PAD_NAME (pad)); gst_caps_debug (caps, "caps themselves (attemped to set)"); gst_caps_debug (allowed, "allowed caps that did not agree with caps"); gst_caps_unref (allowed); return GST_PAD_LINK_REFUSED; } /* caps checks out fine, we can unref the intersection now */ gst_caps_unref (intersection); gst_caps_unref (allowed); /* given that the caps are fixed, we know that their intersection with the * padtemplate caps is the same as caps itself */ } /* we need to notify the link function */ if (notify && GST_RPAD_LINKFUNC (pad)) { GstPadLinkReturn res; gchar *debug_string; gboolean negotiating; GST_INFO (GST_CAT_CAPS, "calling link function on pad %s:%s", GST_DEBUG_PAD_NAME (pad)); negotiating = GST_FLAG_IS_SET (pad, GST_PAD_NEGOTIATING); /* set the NEGOTIATING flag if not already done */ if (!negotiating) GST_FLAG_SET (pad, GST_PAD_NEGOTIATING); /* call the link function */ res = GST_RPAD_LINKFUNC (pad) (GST_PAD (pad), caps); /* unset again after negotiating only if we set it */ if (!negotiating) GST_FLAG_UNSET (pad, GST_PAD_NEGOTIATING); switch (res) { case GST_PAD_LINK_REFUSED: debug_string = "REFUSED"; break; case GST_PAD_LINK_OK: debug_string = "OK"; break; case GST_PAD_LINK_DONE: debug_string = "DONE"; break; case GST_PAD_LINK_DELAYED: debug_string = "DELAYED"; break; default: g_warning ("unknown return code from link function of pad %s:%s %d", GST_DEBUG_PAD_NAME (pad), res); return GST_PAD_LINK_REFUSED; } GST_INFO (GST_CAT_CAPS, "got reply %s (%d) from link function on pad %s:%s", debug_string, res, GST_DEBUG_PAD_NAME (pad)); /* done means the link function called another caps negotiate function * on this pad that succeeded, we dont need to continue */ if (res == GST_PAD_LINK_DONE) { GST_INFO (GST_CAT_CAPS, "pad %s:%s is done", GST_DEBUG_PAD_NAME (pad)); return GST_PAD_LINK_DONE; } if (res == GST_PAD_LINK_REFUSED) { GST_INFO (GST_CAT_CAPS, "pad %s:%s doesn't accept caps", GST_DEBUG_PAD_NAME (pad)); return GST_PAD_LINK_REFUSED; } } /* we can only set caps on the pad if they are fixed */ if (GST_CAPS_IS_FIXED (caps)) { GST_INFO (GST_CAT_CAPS, "setting caps on pad %s:%s", GST_DEBUG_PAD_NAME (pad)); /* if we got this far all is ok, remove the old caps, set the new one */ gst_caps_replace_sink (&GST_PAD_CAPS (pad), caps); g_object_notify (G_OBJECT (pad), "caps"); } else { GST_INFO (GST_CAT_CAPS, "caps are not fixed on pad %s:%s, not setting them yet", GST_DEBUG_PAD_NAME (pad)); return GST_PAD_LINK_DELAYED; } return GST_PAD_LINK_OK; } /** * gst_pad_try_set_caps: * @pad: a #GstPad to try to set the caps on. * @caps: the #GstCaps to set. * * Tries to set the caps on the given pad. Ownership is always taken * of the caps, so you will need to unref non-floating caps. * * Returns: A #GstPadLinkReturn value indicating whether the caps * could be set. */ GstPadLinkReturn gst_pad_try_set_caps (GstPad *pad, GstCaps *caps) { GstRealPad *peer, *realpad; GstPadLinkReturn set_retval; realpad = GST_PAD_REALIZE (pad); peer = GST_RPAD_PEER (realpad); GST_INFO (GST_CAT_CAPS, "trying to set caps %p on pad %s:%s", caps, GST_DEBUG_PAD_NAME (realpad)); gst_caps_debug (caps, "caps that we are trying to set"); /* try to take ownership */ gst_caps_ref (caps); gst_caps_sink (caps); /* setting non fixed caps on a pad is not allowed */ if (!GST_CAPS_IS_FIXED (caps)) { GST_INFO (GST_CAT_CAPS, "trying to set unfixed caps on pad %s:%s, not allowed", GST_DEBUG_PAD_NAME (realpad)); g_warning ("trying to set non fixed caps on pad %s:%s, not allowed", GST_DEBUG_PAD_NAME (realpad)); gst_caps_debug (caps, "unfixed caps"); set_retval = GST_PAD_LINK_DELAYED; goto done; } /* if we have a peer try to set the caps, notifying the peerpad * if it has a link function */ if (peer && ((set_retval = gst_pad_try_set_caps_func (peer, caps, TRUE)) <= 0)) { GST_INFO (GST_CAT_CAPS, "tried to set caps on peerpad %s:%s but couldn't, return value %d", GST_DEBUG_PAD_NAME (peer), set_retval); goto done; } /* then try to set our own caps, we don't need to be notified */ if ((set_retval = gst_pad_try_set_caps_func (realpad, caps, FALSE)) <= 0) { GST_INFO (GST_CAT_CAPS, "tried to set own caps on pad %s:%s but couldn't, return value %d", GST_DEBUG_PAD_NAME (realpad), set_retval); goto done; } GST_INFO (GST_CAT_CAPS, "succeeded setting caps %p on pad %s:%s, return value %d", caps, GST_DEBUG_PAD_NAME (realpad), set_retval); g_assert (GST_PAD_CAPS (pad)); done: /* if we took ownership, the caps will be freed */ gst_caps_unref (caps); return set_retval; } /* this is a caps negotiation convenience routine, it: * * 1. optionally clears any pad caps. * 2. calculates the intersection between the two pad tamplate/getcaps caps. * 3. calculates the intersection with the (optional) filtercaps. * 4. stores the intersection in the pad filter. * 5. stores the app filtercaps in the pad appfilter. * 6. starts the caps negotiation. */ static gboolean gst_pad_try_relink_filtered_func (GstRealPad *srcpad, GstRealPad *sinkpad, GstCaps *filtercaps, gboolean clear) { GstCaps *srccaps, *sinkcaps; GstCaps *intersection = NULL; GstRealPad *realsrc, *realsink; realsrc = GST_PAD_REALIZE (srcpad); realsink = GST_PAD_REALIZE (sinkpad); g_return_val_if_fail (GST_RPAD_PEER (realsrc) != NULL, FALSE); g_return_val_if_fail (GST_RPAD_PEER (realsink) == realsrc, FALSE); /* optinally clear the caps */ if (clear) { GST_INFO (GST_CAT_PADS, "start relink filtered %s:%s and %s:%s, clearing caps", GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink)); gst_caps_replace (&GST_PAD_CAPS (GST_PAD (realsrc)), NULL); gst_caps_replace (&GST_PAD_CAPS (GST_PAD (realsink)), NULL); gst_caps_replace (&GST_RPAD_FILTER (realsrc), NULL); gst_caps_replace (&GST_RPAD_FILTER (realsink), NULL); } else { GST_INFO (GST_CAT_PADS, "start relink filtered %s:%s and %s:%s", GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink)); } srccaps = gst_pad_get_caps (GST_PAD (realsrc)); GST_DEBUG (GST_CAT_PADS, "dumping caps of pad %s:%s", GST_DEBUG_PAD_NAME (realsrc)); gst_caps_debug (srccaps, "caps of src pad (pre-relink)"); sinkcaps = gst_pad_get_caps (GST_PAD (realsink)); GST_DEBUG (GST_CAT_PADS, "dumping caps of pad %s:%s", GST_DEBUG_PAD_NAME (realsink)); gst_caps_debug (sinkcaps, "caps of sink pad (pre-relink)"); /* first take the intersection of the pad caps */ intersection = gst_caps_intersect (srccaps, sinkcaps); gst_caps_debug (intersection, "caps of intersection"); /* if we have no intersection but one of the caps was not NULL.. */ if (!intersection && (srccaps || sinkcaps)) { /* the intersection is NULL but the pad caps were not both NULL, * this means they have no common format */ GST_INFO (GST_CAT_PADS, "pads %s:%s and %s:%s have no common type", GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink)); /* make sure any floating caps from gst_pad_get_caps are freed here */ gst_caps_sink (srccaps); gst_caps_sink (sinkcaps); return FALSE; } else { GST_INFO (GST_CAT_PADS, "pads %s:%s and %s:%s intersected to %s caps", GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink), (intersection ? (GST_CAPS_IS_FIXED (intersection) ? "fixed" : "variable") : "NULL")); /* we don't need those anymore, as the caps can be floating */ gst_caps_sink (srccaps); gst_caps_sink (sinkcaps); /* then filter this against the app filter */ if (filtercaps) { GstCaps *filtered_intersection; filtered_intersection = gst_caps_intersect (intersection, filtercaps); gst_caps_sink (intersection); if (!filtered_intersection) { GST_INFO (GST_CAT_PADS, "filtered link between pads %s:%s and %s:%s is empty", GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink)); return FALSE; } intersection = filtered_intersection; /* keep a reference to the app caps */ gst_caps_replace_sink (&GST_RPAD_APPFILTER (realsink), filtercaps); gst_caps_replace_sink (&GST_RPAD_APPFILTER (realsrc), filtercaps); } } GST_DEBUG (GST_CAT_CAPS, "setting filter for link to:"); gst_caps_debug (intersection, "filter for link"); /* both the app filter and the filter, while stored on both peer pads, * are equal to the same thing on both */ gst_caps_replace_sink (&GST_RPAD_FILTER (realsrc), intersection); gst_caps_replace_sink (&GST_RPAD_FILTER (realsink), intersection); gst_caps_sink (intersection); return gst_pad_perform_negotiate (GST_PAD (realsrc), GST_PAD (realsink)); } /** * gst_pad_perform_negotiate: * @srcpad: the source #GstPad. * @sinkpad: the sink #GstPad. * * Tries to negotiate the pads. * * Returns: TRUE if the pads were succesfully negotiated, FALSE otherwise. */ gboolean gst_pad_perform_negotiate (GstPad *srcpad, GstPad *sinkpad) { GstCaps *intersection, *filtered_intersection; GstRealPad *realsrc, *realsink; GstCaps *srccaps, *sinkcaps, *filter; gboolean res = TRUE; GstElement *parent; g_return_val_if_fail (srcpad != NULL, FALSE); g_return_val_if_fail (sinkpad != NULL, FALSE); realsrc = GST_PAD_REALIZE (srcpad); realsink = GST_PAD_REALIZE (sinkpad); g_return_val_if_fail (GST_RPAD_PEER (realsrc) != NULL, FALSE); g_return_val_if_fail (GST_RPAD_PEER (realsink) == realsrc, FALSE); /* shortcut negotiation */ parent = GST_PAD_PARENT (realsrc); if (parent && GST_STATE (parent) < GST_STATE_READY) { GST_DEBUG (GST_CAT_CAPS, "parent %s of pad %s:%s is not READY", GST_ELEMENT_NAME (parent), GST_DEBUG_PAD_NAME (realsrc)); return TRUE; } parent = GST_PAD_PARENT (realsink); if (parent && GST_STATE (parent) < GST_STATE_READY) { GST_DEBUG (GST_CAT_CAPS, "parent %s of pad %s:%s is not READY", GST_ELEMENT_NAME (parent), GST_DEBUG_PAD_NAME (realsink)); return TRUE; } GST_INFO (GST_CAT_PADS, "perform negotiate for link %s:%s-%s:%s", GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink)); filter = GST_RPAD_APPFILTER (realsrc); if (filter) { GST_INFO (GST_CAT_PADS, "dumping filter for link %s:%s-%s:%s", GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink)); gst_caps_debug (filter, "link filter caps"); } /* calculate the new caps here */ srccaps = gst_pad_get_caps (GST_PAD (realsrc)); GST_DEBUG (GST_CAT_PADS, "dumping caps of pad %s:%s", GST_DEBUG_PAD_NAME (realsrc)); gst_caps_debug (srccaps, "src caps, awaiting negotiation, after applying filter"); sinkcaps = gst_pad_get_caps (GST_PAD (realsink)); GST_DEBUG (GST_CAT_PADS, "dumping caps of pad %s:%s", GST_DEBUG_PAD_NAME (realsink)); gst_caps_debug (sinkcaps, "sink caps, awaiting negotiation, after applying filter"); intersection = gst_caps_intersect (srccaps, sinkcaps); filtered_intersection = gst_caps_intersect (intersection, filter); gst_caps_unref (intersection); /* no negotiation is performed if the pads have filtercaps */ if (filtered_intersection) { GstPadLinkReturn link_res; link_res = gst_pad_try_set_caps_func (realsrc, filtered_intersection, TRUE); if (link_res == GST_PAD_LINK_REFUSED) goto error; if (link_res == GST_PAD_LINK_DONE) goto success; link_res = gst_pad_try_set_caps_func (realsink, filtered_intersection, TRUE); if (link_res == GST_PAD_LINK_REFUSED) goto error; if (link_res == GST_PAD_LINK_DONE) goto success; } /* no filtered_intersection, some pads had caps and ther was a filter */ else if ((srccaps || sinkcaps) && filter) { goto error; } success: cleanup: gst_caps_sink (srccaps); gst_caps_sink (sinkcaps); gst_caps_unref (filtered_intersection); return res; error: res = FALSE; goto cleanup; } /** * 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, GstCaps *filtercaps) { GstRealPad *realsrc, *realsink; g_return_val_if_fail (srcpad != NULL, FALSE); g_return_val_if_fail (sinkpad != NULL, FALSE); realsrc = GST_PAD_REALIZE (srcpad); realsink = GST_PAD_REALIZE (sinkpad); g_return_val_if_fail (GST_RPAD_PEER (realsrc) != NULL, FALSE); g_return_val_if_fail (GST_RPAD_PEER (realsink) == realsrc, FALSE); return gst_pad_try_relink_filtered_func (realsrc, realsink, filtercaps, 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, GstCaps *filtercaps) { GstRealPad *realsrc, *realsink; g_return_val_if_fail (srcpad != NULL, FALSE); g_return_val_if_fail (sinkpad != NULL, FALSE); realsrc = GST_PAD_REALIZE (srcpad); realsink = GST_PAD_REALIZE (sinkpad); g_return_val_if_fail (GST_RPAD_PEER (realsrc) != NULL, FALSE); g_return_val_if_fail (GST_RPAD_PEER (realsink) == realsrc, FALSE); if (!gst_pad_try_relink_filtered_func (realsrc, realsink, filtercaps, TRUE)) { gst_pad_unlink (srcpad, GST_PAD (GST_PAD_PEER (srcpad))); return FALSE; } return TRUE; } /** * 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, GstCaps *caps) { GstRealPad *peer, *realpad; realpad = GST_PAD_REALIZE (pad); peer = GST_RPAD_PEER (realpad); GST_INFO (GST_CAT_CAPS, "proxy link to pad %s:%s", GST_DEBUG_PAD_NAME (realpad)); if (peer && gst_pad_try_set_caps_func (peer, caps, TRUE) < 0) return GST_PAD_LINK_REFUSED; if (gst_pad_try_set_caps_func (realpad, caps, FALSE) < 0) return GST_PAD_LINK_REFUSED; if (peer) { gst_caps_debug (caps, "proxy link filter"); GST_INFO (GST_CAT_CAPS, "setting filter on %s:%s and %s:%s", GST_DEBUG_PAD_NAME (peer), GST_DEBUG_PAD_NAME (realpad)); gst_caps_replace_sink (&GST_RPAD_FILTER (peer), caps); gst_caps_replace_sink (&GST_RPAD_FILTER (realpad), caps); } return GST_PAD_LINK_OK; } /** * 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 potentially * returns a floating caps, so use gst_caps_sink to get rid of * it. */ GstCaps* gst_pad_get_caps (GstPad *pad) { GstRealPad *realpad; g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); realpad = GST_PAD_REALIZE (pad); GST_DEBUG (GST_CAT_CAPS, "get pad caps of %s:%s (%p)", GST_DEBUG_PAD_NAME (realpad), realpad); /* note that we will not _ref the caps here as this function might be * called recursively */ if (GST_PAD_CAPS (realpad)) { GST_DEBUG (GST_CAT_CAPS, "using pad real caps %p", GST_PAD_CAPS (realpad)); return GST_PAD_CAPS (realpad); } else if GST_RPAD_GETCAPSFUNC (realpad) { GST_DEBUG (GST_CAT_CAPS, "using pad get function"); return GST_RPAD_GETCAPSFUNC (realpad) (GST_PAD_CAST (realpad), NULL); } else if (GST_PAD_PAD_TEMPLATE (realpad)) { GstPadTemplate *templ = GST_PAD_PAD_TEMPLATE (realpad); GST_DEBUG (GST_CAT_CAPS, "using pad template %p with caps %p", templ, GST_PAD_TEMPLATE_CAPS (templ)); return GST_PAD_TEMPLATE_CAPS (templ); } GST_DEBUG (GST_CAT_CAPS, "pad has no caps"); return NULL; } /** * gst_pad_get_pad_template_caps: * @pad: a #GstPad to get the template capabilities from. * * Gets the template capabilities of this pad. * * Returns: the template #GstCaps of this pad, unref the caps * if you no longer need it. */ GstCaps* gst_pad_get_pad_template_caps (GstPad *pad) { g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); if (GST_PAD_PAD_TEMPLATE (pad)) return gst_caps_ref (GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (pad))); return NULL; } /** * gst_pad_template_get_caps_by_name: * @templ: a #GstPadTemplate to get the capabilities of. * @name: the name of the capability to get. * * Gets the capability with the given name from this pad template. * * Returns: the #GstCaps, or NULL if not found or in case of an error. unref * the caps if you no longer need it. */ GstCaps* gst_pad_template_get_caps_by_name (GstPadTemplate *templ, const gchar *name) { GstCaps *caps; g_return_val_if_fail (templ != NULL, NULL); caps = GST_PAD_TEMPLATE_CAPS (templ); if (!caps) return NULL; return gst_caps_ref (gst_caps_get_by_name (caps, name)); } /** * gst_pad_check_compatibility: * @srcpad: the source #GstPad to check. * @sinkpad: the sink #GstPad to check against. * * Checks if two pads have compatible capabilities. * * Returns: TRUE if they are compatible or if the capabilities * could not be checked */ gboolean gst_pad_check_compatibility (GstPad *srcpad, GstPad *sinkpad) { g_return_val_if_fail (srcpad != NULL, FALSE); g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE); g_return_val_if_fail (sinkpad != NULL, FALSE); g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE); if (GST_PAD_CAPS (srcpad) && GST_PAD_CAPS (sinkpad)) { if (!gst_caps_is_always_compatible (GST_PAD_CAPS (srcpad), GST_PAD_CAPS (sinkpad))) { return FALSE; } else { return TRUE; } } else { GST_DEBUG (GST_CAT_PADS, "could not check capabilities of pads (%s:%s) and (%s:%s) %p %p", GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad), GST_PAD_CAPS (srcpad), GST_PAD_CAPS (sinkpad)); return TRUE; } } /** * gst_pad_get_peer: * @pad: a #GstPad to get the peer of. * * Gets the peer pad of this pad. * * Returns: the peer #GstPad. */ GstPad* gst_pad_get_peer (GstPad *pad) { g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); return GST_PAD (GST_PAD_PEER (pad)); } /** * gst_pad_get_allowed_caps: * @pad: a #GstPad to get the allowed caps of. * * Gets the capabilities of the allowed media types that can * flow through this pad. The caller must free the resulting caps. * * Returns: the allowed #GstCaps of the pad link. unref the caps if * you no longer need it. */ GstCaps* gst_pad_get_allowed_caps (GstPad *pad) { GstCaps *caps; GstRealPad *realpad; g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); realpad = GST_PAD_REALIZE (pad); GST_DEBUG (GST_CAT_PROPERTIES, "get allowed caps of %s:%s", GST_DEBUG_PAD_NAME (pad)); caps = gst_caps_ref (GST_RPAD_FILTER (realpad)); return caps; } /** * gst_pad_recalc_allowed_caps: * @pad: a #GstPad to recalculate the capablities of. * * Attempts to relink the pad to its peer through its filter, * set with gst_pad_[re]link_filtered. This function is useful when a * plug-in has new capabilities on a pad and wants to notify the peer. * * Returns: TRUE on success, FALSE otherwise. */ gboolean gst_pad_recalc_allowed_caps (GstPad *pad) { GstRealPad *peer; g_return_val_if_fail (pad != NULL, FALSE); g_return_val_if_fail (GST_IS_PAD (pad), FALSE); GST_DEBUG (GST_CAT_PROPERTIES, "set allowed caps of %s:%s", GST_DEBUG_PAD_NAME (pad)); peer = GST_RPAD_PEER (pad); if (peer) return gst_pad_try_relink_filtered (pad, GST_PAD (peer), GST_RPAD_APPFILTER (pad)); return TRUE; } /** * 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, GstCaps *allowed) { GstElement *parent; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); /* see if someone can resolve this */ if (g_signal_has_handler_pending (G_OBJECT (pad), gst_real_pad_signals[REAL_CAPS_NEGO_FAILED], 0, FALSE)) { /* clear pad caps first */ gst_caps_replace (&GST_PAD_CAPS (pad), NULL); /* lets hope some signal manages to set the caps again */ g_signal_emit (G_OBJECT (pad), gst_real_pad_signals[REAL_CAPS_NEGO_FAILED], 0, allowed); /* if the pad has caps now or is disabled, it's ok */ if (GST_PAD_CAPS (pad) != NULL || !GST_PAD_IS_ACTIVE (pad)) return TRUE; } /* report error */ parent = gst_pad_get_parent (pad); gst_element_error (parent, "negotiation failed on pad %s:%s", GST_DEBUG_PAD_NAME (pad)); return FALSE; } /** * gst_pad_get_bufferpool: * @pad: a #GstPad to get the bufferpool from. * * Gets the bufferpool of the peer pad of the given pad.Note that * a bufferpool can only be obtained from a srcpad. * * Returns: the #GstBufferPool, or NULL in case of an error. */ GstBufferPool* gst_pad_get_bufferpool (GstPad *pad) { GstRealPad *peer; g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); g_return_val_if_fail (GST_PAD_IS_SRC (pad), NULL); peer = GST_RPAD_PEER (pad); if (!peer) return NULL; GST_DEBUG_ENTER ("(%s:%s)", GST_DEBUG_PAD_NAME (pad)); if (peer->bufferpoolfunc) { GST_DEBUG (GST_CAT_PADS, "calling bufferpoolfunc &%s (@%p) of peer pad %s:%s", GST_DEBUG_FUNCPTR_NAME (peer->bufferpoolfunc), &peer->bufferpoolfunc, GST_DEBUG_PAD_NAME (((GstPad*) peer))); return (peer->bufferpoolfunc) (((GstPad*) peer)); } else { GST_DEBUG (GST_CAT_PADS, "no bufferpoolfunc for peer pad %s:%s at %p", GST_DEBUG_PAD_NAME (((GstPad*) peer)), &peer->bufferpoolfunc); return NULL; } } static void gst_real_pad_dispose (GObject *object) { GstPad *pad = GST_PAD (object); /* No linked pad can ever be disposed. * It has to have a parent to be linked * and a parent would hold a reference */ g_assert (GST_PAD_PEER (pad) == NULL); GST_DEBUG (GST_CAT_REFCOUNTING, "dispose %s:%s", GST_DEBUG_PAD_NAME(pad)); /* we destroy the ghostpads, because they are nothing without the real pad */ if (GST_REAL_PAD (pad)->ghostpads) { GList *orig, *ghostpads; orig = ghostpads = g_list_copy (GST_REAL_PAD (pad)->ghostpads); while (ghostpads) { GstPad *ghostpad = GST_PAD (ghostpads->data); if (GST_IS_ELEMENT (GST_OBJECT_PARENT (ghostpad))){ GST_DEBUG (GST_CAT_REFCOUNTING, "removing ghost pad from element '%s'", GST_OBJECT_NAME (GST_OBJECT_PARENT (ghostpad))); gst_element_remove_ghost_pad (GST_ELEMENT (GST_OBJECT_PARENT (ghostpad)), GST_PAD (ghostpad)); } ghostpads = g_list_next (ghostpads); } g_list_free (orig); g_list_free (GST_REAL_PAD(pad)->ghostpads); } gst_caps_replace (&GST_PAD_CAPS (pad), NULL); gst_caps_replace (&GST_RPAD_APPFILTER (pad), NULL); if (GST_IS_ELEMENT (GST_OBJECT_PARENT (pad))) { GST_DEBUG (GST_CAT_REFCOUNTING, "removing pad from element '%s'", GST_OBJECT_NAME (GST_OBJECT (GST_ELEMENT (GST_OBJECT_PARENT (pad))))); gst_element_remove_pad (GST_ELEMENT (GST_OBJECT_PARENT (pad)), pad); } G_OBJECT_CLASS (real_pad_parent_class)->dispose (object); } #ifndef GST_DISABLE_LOADSAVE /* 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_DEBUG (GST_CAT_XML, "Could not parse peer '%s' for pad %s:%s, leaving unlinked", peer, GST_DEBUG_PAD_NAME (pad)); return; } g_return_if_fail (split[0] != NULL); g_return_if_fail (split[1] != NULL); grandparent = gst_object_get_parent (parent); if (grandparent && GST_IS_BIN (grandparent)) { target = gst_bin_get_by_name_recurse_up (GST_BIN (grandparent), split[0]); } else goto cleanup; if (target == NULL) goto cleanup; targetpad = gst_element_get_pad (target, split[1]); if (targetpad == NULL) goto cleanup; gst_pad_link (pad, targetpad); cleanup: g_strfreev (split); } /** * gst_pad_save_thyself: * @pad: a #GstPad to save. * @parent: the parent #xmlNodePtr to save the description in. * * Saves the pad into an xml representation. * * Returns: the #xmlNodePtr representation of the pad. */ static xmlNodePtr gst_pad_save_thyself (GstObject *object, xmlNodePtr parent) { GstRealPad *realpad; GstPad *peer; g_return_val_if_fail (GST_IS_REAL_PAD (object), NULL); realpad = GST_REAL_PAD (object); xmlNewChild (parent, NULL, "name", GST_PAD_NAME (realpad)); if (GST_RPAD_PEER (realpad) != NULL) { gchar *content; peer = GST_PAD (GST_RPAD_PEER (realpad)); /* first check to see if the peer's parent's parent is the same */ /* we just save it off */ content = g_strdup_printf ("%s.%s", GST_OBJECT_NAME (GST_PAD_PARENT (peer)), GST_PAD_NAME (peer)); xmlNewChild (parent, NULL, "peer", content); g_free (content); } else xmlNewChild (parent, NULL, "peer", ""); return parent; } /* FIXME: shouldn't pad and ghost be switched ? */ /** * gst_ghost_pad_save_thyself: * @pad: a ghost #GstPad to save. * @parent: the parent #xmlNodePtr to save the description in. * * Saves the ghost pad into an xml representation. * * Returns: the #xmlNodePtr representation of the pad. */ xmlNodePtr gst_ghost_pad_save_thyself (GstPad *pad, xmlNodePtr parent) { xmlNodePtr self; g_return_val_if_fail (GST_IS_GHOST_PAD (pad), NULL); self = xmlNewChild (parent, NULL, "ghostpad", NULL); xmlNewChild (self, NULL, "name", GST_PAD_NAME (pad)); xmlNewChild (self, NULL, "parent", GST_OBJECT_NAME (GST_PAD_PARENT (pad))); /* FIXME FIXME FIXME! */ return self; } #endif /* GST_DISABLE_LOADSAVE */ /** * gst_pad_push: * @pad: a #GstPad to push the buffer out of. * @buf: the #GstBuffer to push. * * Pushes a buffer to the peer of the pad. */ void gst_pad_push (GstPad *pad, GstBuffer *buf) { GstRealPad *peer; GstData *data = GST_DATA(buf); g_assert (GST_IS_PAD (pad)); GST_DEBUG_ENTER ("(%s:%s)", GST_DEBUG_PAD_NAME (pad)); g_return_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SRC); if (!gst_probe_dispatcher_dispatch (&(GST_REAL_PAD (pad)->probedisp), &data)) return; 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 (pad)) { g_warning ("push on pad %s:%s but it is not active", GST_DEBUG_PAD_NAME (pad)); return; } if (peer->chainhandler) { if (data) { GST_DEBUG (GST_CAT_DATAFLOW, "calling chainhandler &%s of peer pad %s:%s", GST_DEBUG_FUNCPTR_NAME (peer->chainhandler), GST_DEBUG_PAD_NAME (GST_PAD (peer))); if (!gst_probe_dispatcher_dispatch (&peer->probedisp, &data)) return; (peer->chainhandler) (GST_PAD_CAST (peer), (GstBuffer *)data); return; } else { g_warning ("trying to push a NULL buffer on pad %s:%s", GST_DEBUG_PAD_NAME (peer)); return; } } else { g_warning ("internal error: push on pad %s:%s but it has no chainhandler", GST_DEBUG_PAD_NAME (peer)); } } /* clean up the mess here */ if (data != NULL) gst_data_unref (data); } /** * gst_pad_pull: * @pad: a #GstPad to pull a buffer from. * * Pulls a buffer from the peer pad. * * Returns: a new #GstBuffer from the peer pad. */ GstBuffer* gst_pad_pull (GstPad *pad) { GstRealPad *peer; GST_DEBUG_ENTER("(%s:%s)",GST_DEBUG_PAD_NAME(pad)); g_return_val_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SINK, GST_BUFFER (gst_event_new (GST_EVENT_INTERRUPT))); peer = GST_RPAD_PEER (pad); if (!peer) { gst_element_error (GST_PAD_PARENT (pad), "pull on pad %s:%s but it was unlinked", GST_ELEMENT_NAME (GST_PAD_PARENT (pad)), GST_PAD_NAME (pad), NULL); } else { restart: if (peer->gethandler) { GstData *data; GST_DEBUG (GST_CAT_DATAFLOW, "calling gethandler %s of peer pad %s:%s", GST_DEBUG_FUNCPTR_NAME (peer->gethandler), GST_DEBUG_PAD_NAME (peer)); data = GST_DATA((peer->gethandler) (GST_PAD_CAST (peer))); if (data) { if (!gst_probe_dispatcher_dispatch (&peer->probedisp, &data)) goto restart; return GST_BUFFER(data); } /* no null buffers allowed */ gst_element_error (GST_PAD_PARENT (pad), "NULL buffer during pull on %s:%s", GST_DEBUG_PAD_NAME (pad), NULL); } else { gst_element_error (GST_PAD_PARENT (pad), "internal error: pull on pad %s:%s " "but the peer pad %s:%s has no gethandler", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_PAD_NAME (peer), NULL); } } return GST_BUFFER (gst_event_new (GST_EVENT_INTERRUPT)); } /** * gst_pad_select: * @padlist: a #GList of pads. * * Waits for a buffer on any of the list of pads. * * Returns: the #GstPad that has a buffer available. * Use #gst_pad_pull() to get the buffer. */ GstPad* gst_pad_select (GList *padlist) { GstPad *pad; pad = gst_scheduler_pad_select (GST_PAD_PARENT (padlist->data)->sched, padlist); return pad; } /** * gst_pad_selectv: * @pad: a first #GstPad to perform the select on. * @...: A NULL-terminated list of more pads to select on. * * Waits for a buffer on the given set of pads. * * Returns: the #GstPad that has a buffer available. * Use #gst_pad_pull() to get the buffer. */ GstPad* gst_pad_selectv (GstPad *pad, ...) { GstPad *result; GList *padlist = NULL; va_list var_args; if (pad == NULL) return NULL; va_start (var_args, pad); while (pad) { padlist = g_list_prepend (padlist, pad); pad = va_arg (var_args, GstPad *); } result = gst_pad_select (padlist); g_list_free (padlist); va_end (var_args); return result; } /************************************************************************ * * templates * */ static void gst_pad_template_class_init (GstPadTemplateClass *klass); static void gst_pad_template_init (GstPadTemplate *templ); static void gst_pad_template_dispose (GObject *object); GType gst_pad_template_get_type (void) { static GType padtemplate_type = 0; if (!padtemplate_type) { static const GTypeInfo padtemplate_info = { sizeof (GstPadTemplateClass), NULL, NULL, (GClassInitFunc) gst_pad_template_class_init, NULL, NULL, sizeof (GstPadTemplate), 32, (GInstanceInitFunc) gst_pad_template_init, NULL }; padtemplate_type = g_type_register_static(GST_TYPE_OBJECT, "GstPadTemplate", &padtemplate_info, 0); } return padtemplate_type; } static void gst_pad_template_class_init (GstPadTemplateClass *klass) { GObjectClass *gobject_class; GstObjectClass *gstobject_class; gobject_class = (GObjectClass*) klass; gstobject_class = (GstObjectClass*) klass; padtemplate_parent_class = g_type_class_ref (GST_TYPE_OBJECT); gst_pad_template_signals[TEMPL_PAD_CREATED] = g_signal_new ("pad_created", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstPadTemplateClass, pad_created), NULL, NULL, gst_marshal_VOID__POINTER, G_TYPE_NONE, 1, G_TYPE_POINTER); 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)); gst_caps_unref (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_pad_template_newv: * @name_template: the name template. * @direction: the #GstPadDirection of the template. * @presence: the #GstPadPresence of the pad. * @caps: a #GstCaps set for the template. * @var_args: a NULL-terminated list of #GstCaps. * * Creates a new pad template with a name according to the given template * and with the given arguments. * * Returns: a new #GstPadTemplate. */ GstPadTemplate* gst_pad_template_newv (const gchar *name_template, GstPadDirection direction, GstPadPresence presence, GstCaps *caps, va_list var_args) { GstPadTemplate *new; GstCaps *thecaps = NULL; g_return_val_if_fail (name_template != NULL, NULL); if (!name_is_valid (name_template, presence)) return NULL; new = g_object_new (gst_pad_template_get_type (), "name", name_template, NULL); GST_PAD_TEMPLATE_NAME_TEMPLATE (new) = g_strdup (name_template); GST_PAD_TEMPLATE_DIRECTION (new) = direction; GST_PAD_TEMPLATE_PRESENCE (new) = presence; GST_FLAG_SET (GST_OBJECT (new), GST_PAD_TEMPLATE_FIXED); while (caps) { if (!GST_CAPS_IS_FIXED (caps)) { GST_FLAG_UNSET (GST_OBJECT (new), GST_PAD_TEMPLATE_FIXED); } thecaps = gst_caps_append (thecaps, caps); caps = va_arg (var_args, GstCaps*); } GST_PAD_TEMPLATE_CAPS (new) = thecaps; gst_caps_ref (thecaps); gst_caps_sink (thecaps); 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. * @...: a NULL-terminated list of #GstCaps. * * Creates a new pad template with a name according to the given template * and with the given arguments. * * Returns: a new #GstPadTemplate. */ GstPadTemplate* gst_pad_template_new (const gchar *name_template, GstPadDirection direction, GstPadPresence presence, GstCaps *caps, ...) { GstPadTemplate *new; va_list var_args; va_start (var_args, caps); new = gst_pad_template_newv (name_template, direction, presence, caps, var_args); va_end (var_args); return new; } /** * gst_pad_template_get_caps: * @templ: a #GstPadTemplate to get capabilities of. * * Gets the capabilities of the pad template. * * Returns: the #GstCaps of the pad template. unref the caps * after use. */ GstCaps* gst_pad_template_get_caps (GstPadTemplate *templ) { g_return_val_if_fail (templ != NULL, NULL); return gst_caps_ref (GST_PAD_TEMPLATE_CAPS (templ)); } /** * gst_pad_set_element_private: * @pad: the #GstPad to set the private data of. * @priv: The private data to attach to the pad. * * Set the given private data gpointer on the pad. * This function can only be used by the element that owns the pad. */ void gst_pad_set_element_private (GstPad *pad, gpointer priv) { pad->element_private = priv; } /** * gst_pad_get_element_private: * @pad: the #GstPad to get the private data of. * * Gets the private data of a pad. * * Returns: a #gpointer to the private data. */ gpointer gst_pad_get_element_private (GstPad *pad) { return pad->element_private; } /***** ghost pads *****/ GType _gst_ghost_pad_type = 0; static void gst_ghost_pad_class_init (GstGhostPadClass *klass); static void gst_ghost_pad_init (GstGhostPad *pad); static void gst_ghost_pad_dispose (GObject *object); static GstPad *ghost_pad_parent_class = NULL; /* static guint gst_ghost_pad_signals[LAST_SIGNAL] = { 0 }; */ GType gst_ghost_pad_get_type (void) { if (!_gst_ghost_pad_type) { static const GTypeInfo pad_info = { sizeof (GstGhostPadClass), NULL, NULL, (GClassInitFunc) gst_ghost_pad_class_init, NULL, NULL, sizeof (GstGhostPad), 8, (GInstanceInitFunc) gst_ghost_pad_init, NULL }; _gst_ghost_pad_type = g_type_register_static (GST_TYPE_PAD, "GstGhostPad", &pad_info, 0); } return _gst_ghost_pad_type; } static void gst_ghost_pad_class_init (GstGhostPadClass *klass) { GObjectClass *gobject_class; gobject_class = (GObjectClass*) klass; ghost_pad_parent_class = g_type_class_ref (GST_TYPE_PAD); gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_ghost_pad_dispose); } static void gst_ghost_pad_init (GstGhostPad *pad) { /* zeroed by glib */ } static void gst_ghost_pad_dispose (GObject *object) { GstGhostPad *pad = GST_GHOST_PAD (object); if (pad->realpad) gst_pad_remove_ghost_pad((GstPad *) pad->realpad, (GstPad *) pad); G_OBJECT_CLASS (ghost_pad_parent_class)->dispose (object); } /** * gst_ghost_pad_new: * @name: the name of the new ghost pad. * @pad: the #GstPad to create a ghost pad for. * * Creates a new ghost pad associated with the given pad, and names it with * the given name. If name is NULL, a guaranteed unique name (across all * ghost pads) will be assigned (most likely of the form ghostpad%d). * * Returns: a new ghost #GstPad, or NULL in case of an error. */ GstPad* gst_ghost_pad_new (const gchar *name, GstPad *pad) { GstGhostPad *ghostpad; GstRealPad *realpad; g_return_val_if_fail (GST_IS_PAD (pad), NULL); ghostpad = g_object_new (gst_ghost_pad_get_type () ,NULL); gst_pad_set_name (GST_PAD (ghostpad), name); realpad = (GstRealPad *) pad; while (!GST_IS_REAL_PAD (realpad)) { realpad = GST_PAD_REALIZE (realpad); } GST_GPAD_REALPAD (ghostpad) = realpad; gst_pad_set_pad_template (GST_PAD (ghostpad), GST_PAD_PAD_TEMPLATE (pad)); /* add ourselves to the real pad's list of ghostpads */ gst_pad_add_ghost_pad (pad, GST_PAD (ghostpad)); /* FIXME need to ref the real pad here... ? */ GST_DEBUG (GST_CAT_PADS, "created ghost pad \"%s\"", gst_pad_get_name (GST_PAD (ghostpad))); return GST_PAD (ghostpad); } /** * gst_pad_get_internal_links_default: * @pad: the #GstPad to get the internal links of. * * Gets a list of pads to which the given pad is linked to * inside of the parent element. * This is the default handler, and thus returns a list of all of the * pads inside the parent element with opposite direction. * The caller must free this list after use. * * Returns: a newly allocated #GList of pads. */ GList* gst_pad_get_internal_links_default (GstPad *pad) { GList *res = NULL; GstElement *parent; GList *parent_pads; GstPadDirection direction; GstRealPad *rpad; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); rpad = GST_PAD_REALIZE (pad); direction = rpad->direction; parent = GST_PAD_PARENT (rpad); parent_pads = parent->pads; while (parent_pads) { GstRealPad *parent_pad = GST_PAD_REALIZE (parent_pads->data); if (parent_pad->direction != direction) { res = g_list_prepend (res, parent_pad); } parent_pads = g_list_next (parent_pads); } return res; } /** * gst_pad_get_internal_links: * @pad: the #GstPad to get the internal links of. * * Gets a list of pads to which the given pad is linked to * inside of the parent element. * The caller must free this list after use. * * Returns: a newly allocated #GList of pads. */ GList* gst_pad_get_internal_links (GstPad *pad) { GList *res = NULL; GstRealPad *rpad; g_return_val_if_fail (GST_IS_PAD (pad), NULL); rpad = GST_PAD_REALIZE (pad); if (GST_RPAD_INTLINKFUNC (rpad)) res = GST_RPAD_INTLINKFUNC (rpad) (GST_PAD_CAST (rpad)); return res; } static gboolean gst_pad_event_default_dispatch (GstPad *pad, GstElement *element, GstEvent *event) { GList *orig, *pads; orig = pads = gst_pad_get_internal_links (pad); while (pads) { GstPad *eventpad = GST_PAD (pads->data); pads = g_list_next (pads); /* for all pads in the opposite direction that are linked */ if (GST_PAD_IS_LINKED (eventpad)) { if (GST_PAD_DIRECTION (eventpad) == GST_PAD_SRC) { /* increase the refcount */ gst_event_ref (event); gst_pad_push (eventpad, GST_BUFFER (event)); } else { GstPad *peerpad = GST_PAD_CAST (GST_RPAD_PEER (eventpad)); /* we only send the event on one pad, multi-sinkpad elements * should implement a handler */ g_list_free (orig); return gst_pad_send_event (peerpad, event); } } } gst_event_unref (event); g_list_free (orig); return TRUE; } /** * gst_pad_event_default: * @pad: a #GstPad to call the default event handler on. * @event: the #GstEvent to handle. * * Invokes the default event handler for the given pad. * * Returns: TRUE if the event was sent succesfully. */ gboolean gst_pad_event_default (GstPad *pad, GstEvent *event) { GstElement *element; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); g_return_val_if_fail (event, FALSE); element = GST_PAD_PARENT (pad); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_EOS: gst_pad_event_default_dispatch (pad, element, event); gst_element_set_eos (element); break; case GST_EVENT_DISCONTINUOUS: { guint64 time; if (gst_event_discont_get_value (event, GST_FORMAT_TIME, &time)) { if (gst_element_requires_clock (element) && element->clock) { gst_clock_handle_discont (element->clock, time); } } } case GST_EVENT_FLUSH: default: return gst_pad_event_default_dispatch (pad, element, event); } return TRUE; } /** * gst_pad_dispatcher: * @pad: a #GstPad to dispatch. * @dispatch: the #GstDispatcherFunction to call. * @data: gpointer user data passed to the dispatcher function. * * Invokes the given dispatcher function on all pads that are * internally linked to the given pad. * The GstPadDispatcherFunction should return TRUE when no further pads * need to be processed. * * Returns: TRUE if one of the dispatcher functions returned TRUE. */ gboolean gst_pad_dispatcher (GstPad *pad, GstPadDispatcherFunction dispatch, gpointer data) { gboolean res = FALSE; GList *int_pads, *orig; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); g_return_val_if_fail (data, FALSE); orig = int_pads = gst_pad_get_internal_links (pad); while (int_pads) { GstRealPad *int_rpad = GST_PAD_REALIZE (int_pads->data); GstRealPad *int_peer = GST_RPAD_PEER (int_rpad); if (int_peer) { res = dispatch (GST_PAD_CAST (int_peer), data); if (res) break; } int_pads = g_list_next (int_pads); } g_list_free (orig); return res; } /** * gst_pad_send_event: * @pad: a #GstPad to send the event to. * @event: the #GstEvent to send to the pad. * * Sends the event to the pad. * * Returns: TRUE if the event was handled. */ gboolean gst_pad_send_event (GstPad *pad, GstEvent *event) { gboolean success = FALSE; GstRealPad *rpad; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); g_return_val_if_fail (event, FALSE); rpad = GST_PAD_REALIZE (pad); if (GST_EVENT_SRC (event) == NULL) GST_EVENT_SRC (event) = gst_object_ref (GST_OBJECT (rpad)); GST_DEBUG (GST_CAT_EVENT, "have event %d on pad %s:%s", GST_EVENT_TYPE (event), GST_DEBUG_PAD_NAME (rpad)); if (GST_RPAD_EVENTHANDLER (rpad)) success = GST_RPAD_EVENTHANDLER (rpad) (GST_PAD_CAST (rpad), event); else { GST_DEBUG (GST_CAT_EVENT, "there's no event function for pad %s:%s", GST_DEBUG_PAD_NAME (rpad)); gst_event_unref (event); } return success; } typedef struct { GstFormat src_format; gint64 src_value; GstFormat *dest_format; gint64 *dest_value; } GstPadConvertData; static gboolean gst_pad_convert_dispatcher (GstPad *pad, GstPadConvertData *data) { return gst_pad_convert (pad, data->src_format, data->src_value, data->dest_format, data->dest_value); } /** * gst_pad_convert_default: * @pad: a #GstPad to invoke the default converter on. * @src_format: the source #GstFormat. * @src_value: the source value. * @dest_format: a pointer to the destination #GstFormat. * @dest_value: a pointer to the destination value. * * Invokes the default converter on a pad. * This will forward the call to the pad obtained * using the internal link of * the element. * * Returns: TRUE if the conversion could be performed. */ gboolean gst_pad_convert_default (GstPad *pad, GstFormat src_format, gint64 src_value, GstFormat *dest_format, gint64 *dest_value) { GstPadConvertData data; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); g_return_val_if_fail (dest_format, FALSE); g_return_val_if_fail (dest_value, FALSE); data.src_format = src_format; data.src_value = src_value; data.dest_format = dest_format; data.dest_value = dest_value; return gst_pad_dispatcher (pad, (GstPadDispatcherFunction) gst_pad_convert_dispatcher, &data); } /** * gst_pad_convert: * @pad: a #GstPad to invoke the default converter on. * @src_format: the source #GstFormat. * @src_value: the source value. * @dest_format: a pointer to the destination #GstFormat. * @dest_value: a pointer to the destination value. * * Invokes a conversion on the pad. * * Returns: TRUE if the conversion could be performed. */ gboolean gst_pad_convert (GstPad *pad, GstFormat src_format, gint64 src_value, GstFormat *dest_format, gint64 *dest_value) { GstRealPad *rpad; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); g_return_val_if_fail (dest_format, FALSE); g_return_val_if_fail (dest_value, FALSE); if (src_format == *dest_format) { *dest_value = src_value; return TRUE; } rpad = GST_PAD_REALIZE (pad); if (GST_RPAD_CONVERTFUNC (rpad)) { return GST_RPAD_CONVERTFUNC (rpad) (GST_PAD_CAST (rpad), src_format, src_value, dest_format, dest_value); } return FALSE; } typedef struct { GstQueryType type; GstFormat *format; gint64 *value; } GstPadQueryData; static gboolean gst_pad_query_dispatcher (GstPad *pad, GstPadQueryData *data) { return gst_pad_query (pad, data->type, data->format, data->value); } /** * gst_pad_query_default: * @pad: a #GstPad to invoke the default query on. * @type: the #GstQueryType of the query to perform. * @format: a pointer to the #GstFormat of the result. * @value: a pointer to the result. * * Invokes the default query function on a pad. * * Returns: TRUE if the query could be performed. */ gboolean gst_pad_query_default (GstPad *pad, GstQueryType type, GstFormat *format, gint64 *value) { GstPadQueryData data; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); g_return_val_if_fail (format, FALSE); g_return_val_if_fail (value, FALSE); data.type = type; data.format = format; data.value = value; return gst_pad_dispatcher (pad, (GstPadDispatcherFunction) gst_pad_query_dispatcher, &data); } /** * gst_pad_query: * @pad: a #GstPad to invoke the default query on. * @type: the #GstQueryType of the query to perform. * @format: a pointer to the #GstFormat asked for. * On return contains the #GstFormat used. * @value: a pointer to the result. * * Queries a pad for one of the available properties. The format will be * adjusted to the actual format used when specifying formats such as * GST_FORMAT_DEFAULT. * FIXME: Tell if the format can be adjusted when specifying a definite format. * * Returns: TRUE if the query could be performed. */ gboolean gst_pad_query (GstPad *pad, GstQueryType type, GstFormat *format, gint64 *value) { GstRealPad *rpad; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); g_return_val_if_fail (format, FALSE); g_return_val_if_fail (value, FALSE); rpad = GST_PAD_REALIZE (pad); g_return_val_if_fail (rpad, FALSE); if (GST_RPAD_QUERYFUNC (rpad)) return GST_RPAD_QUERYFUNC (rpad) (GST_PAD_CAST (pad), type, format, value); return FALSE; } static gboolean gst_pad_get_formats_dispatcher (GstPad *pad, const GstFormat **data) { *data = gst_pad_get_formats (pad); return TRUE; } /** * gst_pad_get_formats_default: * @pad: a #GstPad to query * * Invoke the default format dispatcher for the pad. * * Returns: An array of GstFormats ended with a 0 value. */ const GstFormat* gst_pad_get_formats_default (GstPad *pad) { GstFormat *result = NULL; gst_pad_dispatcher (pad, (GstPadDispatcherFunction) gst_pad_get_formats_dispatcher, &result); return result; } /** * gst_pad_get_formats: * @pad: a #GstPad to query * * Gets the list of supported formats from the pad. * * Returns: An array of GstFormats ended with a 0 value. */ const GstFormat* gst_pad_get_formats (GstPad *pad) { GstRealPad *rpad; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); rpad = GST_PAD_REALIZE (pad); if (GST_RPAD_FORMATSFUNC (rpad)) return GST_RPAD_FORMATSFUNC (rpad) (GST_PAD_CAST (pad)); return NULL; }