/* 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. */ #include "gst_private.h" #include "gstpad.h" #include "gstutils.h" #include "gstelement.h" #include "gstbin.h" #include "gstscheduler.h" #include "gstevent.h" #include "gstinfo.h" #include "gstvalue.h" #define GST_CAT_DEFAULT GST_CAT_PADS /* FIXME */ #define gst_caps_debug(a,b) GST_DEBUG_CAPS(b,a) enum { TEMPL_PAD_CREATED, /* FILL ME */ TEMPL_LAST_SIGNAL }; static GstObject *padtemplate_parent_class = NULL; static guint gst_pad_template_signals[TEMPL_LAST_SIGNAL] = { 0 }; GType _gst_pad_type = 0; /***** Start with the base GstPad class *****/ static void gst_pad_class_init (GstPadClass *klass); static void gst_pad_init (GstPad *pad); static void gst_pad_dispose (GObject *object); static void gst_pad_set_pad_template (GstPad *pad, GstPadTemplate *templ); static GstCaps * _gst_pad_default_fixate_func (GstPad *pad, GstCaps *caps, gpointer unused); static void gst_pad_link_free (GstPadLink *link); #ifndef GST_DISABLE_LOADSAVE static xmlNodePtr gst_pad_save_thyself (GstObject *object, xmlNodePtr parent); #endif static GstObject *pad_parent_class = NULL; GType gst_pad_get_type (void) { if (!_gst_pad_type) { static const GTypeInfo pad_info = { sizeof (GstPadClass), NULL, NULL, (GClassInitFunc) gst_pad_class_init, NULL, NULL, sizeof (GstPad), 32, (GInstanceInitFunc) gst_pad_init, NULL }; _gst_pad_type = g_type_register_static (GST_TYPE_OBJECT, "GstPad", &pad_info, 0); } return _gst_pad_type; } static void gst_pad_class_init (GstPadClass *klass) { GObjectClass *gobject_class; gobject_class = (GObjectClass*) klass; pad_parent_class = g_type_class_ref (GST_TYPE_OBJECT); gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_pad_dispose); } static void gst_pad_init (GstPad *pad) { /* all structs are initialized to NULL by glib */ } static void gst_pad_dispose (GObject *object) { GstPad *pad = GST_PAD (object); gst_pad_set_pad_template (pad, NULL); G_OBJECT_CLASS (pad_parent_class)->dispose (object); } /***** Then do the Real Pad *****/ /* Pad signals and args */ enum { REAL_CAPS_NEGO_FAILED, REAL_LINKED, REAL_UNLINKED, /* 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__OBJECT, G_TYPE_NONE, 1, GST_TYPE_CAPS); 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); /* 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->ghostpads = NULL; pad->caps = NULL; pad->linkfunc = NULL; pad->getcapsfunc = NULL; pad->eventfunc = gst_pad_event_default; pad->convertfunc = gst_pad_convert_default; pad->queryfunc = gst_pad_query_default; pad->intlinkfunc = gst_pad_get_internal_links_default; pad->eventmaskfunc = gst_pad_get_event_masks_default; pad->formatsfunc = gst_pad_get_formats_default; pad->querytypefunc = gst_pad_get_query_types_default; GST_FLAG_SET (pad, GST_PAD_DISABLED); GST_FLAG_UNSET (pad, GST_PAD_NEGOTIATING); gst_probe_dispatcher_init (&pad->probedisp); } static void gst_real_pad_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { g_return_if_fail (GST_IS_PAD (object)); switch (prop_id) { case REAL_ARG_ACTIVE: gst_pad_set_active (GST_PAD (object), g_value_get_boolean (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_real_pad_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { g_return_if_fail (GST_IS_PAD (object)); switch (prop_id) { case REAL_ARG_ACTIVE: g_value_set_boolean (value, !GST_FLAG_IS_SET (object, GST_PAD_DISABLED)); break; case REAL_ARG_CAPS: g_value_set_boxed (value, GST_PAD_CAPS (GST_REAL_PAD (object))); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } /** * gst_pad_custom_new: * @type: the #Gtype of the pad. * @name: the name of the new pad. * @direction: the #GstPadDirection of the pad. * * Creates a new pad with the given name and type in the given direction. * If name is NULL, a guaranteed unique name (across all pads) * will be assigned. * * Returns: a new #GstPad, or NULL in case of an error. */ GstPad* gst_pad_custom_new (GType type, const gchar *name, GstPadDirection direction) { GstRealPad *pad; g_return_val_if_fail (direction != GST_PAD_UNKNOWN, NULL); pad = g_object_new (type, NULL); gst_object_set_name (GST_OBJECT (pad), name); GST_RPAD_DIRECTION (pad) = direction; return GST_PAD (pad); } /** * gst_pad_new: * @name: the name of the new pad. * @direction: the #GstPadDirection of the pad. * * Creates a new real pad with the given name in the given direction. * If name is NULL, a guaranteed unique name (across all pads) * will be assigned. * * Returns: a new #GstPad, or NULL in case of an error. */ GstPad* gst_pad_new (const gchar *name, GstPadDirection direction) { return gst_pad_custom_new (gst_real_pad_get_type (), name, direction); } /** * gst_pad_custom_new_from_template: * @type: the custom #GType of the pad. * @templ: the #GstPadTemplate to instantiate from. * @name: the name of the new pad. * * Creates a new custom pad with the given name from the given template. * If name is NULL, a guaranteed unique name (across all pads) * will be assigned. * * Returns: a new #GstPad, or NULL in case of an error. */ GstPad* gst_pad_custom_new_from_template (GType type, GstPadTemplate *templ, const gchar *name) { GstPad *pad; g_return_val_if_fail (templ != NULL, NULL); pad = gst_pad_new (name, templ->direction); gst_pad_set_pad_template (pad, templ); return pad; } /** * gst_pad_new_from_template: * @templ: the pad template to use * @name: the name of the element * * Creates a new real pad with the given name from the given template. * If name is NULL, a guaranteed unique name (across all pads) * will be assigned. * * Returns: a new #GstPad, or NULL in case of an error. */ GstPad* gst_pad_new_from_template (GstPadTemplate *templ, const gchar *name) { return gst_pad_custom_new_from_template (gst_real_pad_get_type (), templ, name); } /** * gst_pad_get_direction: * @pad: a #GstPad to get the direction of. * * Gets the direction of the pad. * * Returns: the #GstPadDirection of the pad. */ GstPadDirection gst_pad_get_direction (GstPad *pad) { g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_UNKNOWN); return GST_PAD_DIRECTION (pad); } /** * gst_pad_set_active: * @pad: the #GstPad to activate or deactivate. * @active: TRUE to activate the pad. * * Activates or deactivates the given pad. */ void gst_pad_set_active (GstPad *pad, gboolean active) { GstRealPad *realpad; gboolean old; g_return_if_fail (GST_IS_PAD (pad)); old = GST_PAD_IS_ACTIVE (pad); if (old == active) return; realpad = GST_PAD_REALIZE (pad); if (active) { GST_CAT_DEBUG (GST_CAT_PADS, "activating pad %s:%s", GST_DEBUG_PAD_NAME (realpad)); GST_FLAG_UNSET (realpad, GST_PAD_DISABLED); } else { GST_CAT_DEBUG (GST_CAT_PADS, "de-activating pad %s:%s", GST_DEBUG_PAD_NAME (realpad)); GST_FLAG_SET (realpad, GST_PAD_DISABLED); } g_object_notify (G_OBJECT (realpad), "active"); } /** * gst_pad_is_active: * @pad: the #GstPad to query * * Query if a pad is active * * Returns: TRUE if the pad is active. */ gboolean gst_pad_is_active (GstPad *pad) { g_return_val_if_fail (GST_IS_PAD (pad), FALSE); return !GST_FLAG_IS_SET (pad, GST_PAD_DISABLED); } /** * gst_pad_set_name: * @pad: a #GstPad to set the name of. * @name: the name of the pad. * * Sets the name of a pad. If name is NULL, then a guaranteed unique * name will be assigned. */ void gst_pad_set_name (GstPad *pad, const gchar *name) { g_return_if_fail (GST_IS_PAD (pad)); gst_object_set_name (GST_OBJECT (pad), name); } /** * gst_pad_get_name: * @pad: a #GstPad to get the name of. * * Gets the name of a pad. * * Returns: the name of the pad. This is not a newly allocated pointer * so you must not free it. */ const gchar* gst_pad_get_name (GstPad *pad) { g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); return GST_OBJECT_NAME (pad); } /** * gst_pad_set_chain_function: * @pad: a #GstPad to set the chain function for. * @chain: the #GstPadChainFunction to set. * * Sets the given chain function for the pad. */ void gst_pad_set_chain_function (GstPad *pad, GstPadChainFunction chain) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); g_return_if_fail (GST_RPAD_DIRECTION (pad) == GST_PAD_SINK); GST_RPAD_CHAINFUNC (pad) = chain; GST_CAT_DEBUG (GST_CAT_PADS, "chainfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (chain)); } /** * gst_pad_set_get_function: * @pad: a #GstPad to set the get function for. * @get: the #GstPadGetFunction to set. * * Sets the given get function for the pad. */ void gst_pad_set_get_function (GstPad *pad, GstPadGetFunction get) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); g_return_if_fail (GST_RPAD_DIRECTION (pad) == GST_PAD_SRC); GST_RPAD_GETFUNC (pad) = get; GST_CAT_DEBUG (GST_CAT_PADS, "getfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (get)); } /** * gst_pad_set_event_function: * @pad: a #GstPad to set the event handler for. * @event: the #GstPadEventFunction to set. * * Sets the given event handler for the pad. */ void gst_pad_set_event_function (GstPad *pad, GstPadEventFunction event) { g_return_if_fail (GST_IS_REAL_PAD (pad)); g_return_if_fail (GST_RPAD_DIRECTION (pad) == GST_PAD_SRC); GST_RPAD_EVENTFUNC (pad) = event; GST_CAT_DEBUG (GST_CAT_PADS, "eventfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (event)); } /** * gst_pad_set_event_mask_function: * @pad: a #GstPad to set the event mask function for. * @mask_func: the #GstPadEventMaskFunction to set. * * Sets the given event mask function for the pad. */ void gst_pad_set_event_mask_function (GstPad *pad, GstPadEventMaskFunction mask_func) { g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_EVENTMASKFUNC (pad) = mask_func; GST_CAT_DEBUG (GST_CAT_PADS, "eventmaskfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (mask_func)); } /** * gst_pad_get_event_masks: * @pad: a #GstPad to get the event mask for. * * Gets the array of eventmasks from the given pad. * * Returns: an array with eventmasks, the list is ended * with 0 */ const GstEventMask* gst_pad_get_event_masks (GstPad *pad) { GstRealPad *rpad; if (pad == NULL) return FALSE; rpad = GST_PAD_REALIZE (pad); g_return_val_if_fail (rpad, FALSE); if (GST_RPAD_EVENTMASKFUNC (rpad)) return GST_RPAD_EVENTMASKFUNC (rpad) (GST_PAD (pad)); return NULL; } static gboolean gst_pad_get_event_masks_dispatcher (GstPad *pad, const GstEventMask **data) { *data = gst_pad_get_event_masks (pad); return TRUE; } /** * gst_pad_get_event_masks_default: * @pad: a #GstPad to get the event mask for. * * Invokes the default event masks dispatcher on the pad. * * Returns: an array with eventmasks, the list is ended * with 0 */ const GstEventMask* gst_pad_get_event_masks_default (GstPad *pad) { GstEventMask *result = NULL; gst_pad_dispatcher (pad, (GstPadDispatcherFunction) gst_pad_get_event_masks_dispatcher, &result); return result; } /** * gst_pad_set_convert_function: * @pad: a #GstPad to set the convert function for. * @convert: the #GstPadConvertFunction to set. * * Sets the given convert function for the pad. */ void gst_pad_set_convert_function (GstPad *pad, GstPadConvertFunction convert) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_CONVERTFUNC (pad) = convert; GST_CAT_DEBUG (GST_CAT_PADS, "convertfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (convert)); } /** * gst_pad_set_query_function: * @pad: the #GstPad to set the query function for. * @query: the #GstPadQueryFunction to set. * * Set the given query function for the pad. */ void gst_pad_set_query_function (GstPad *pad, GstPadQueryFunction query) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_QUERYFUNC (pad) = query; GST_CAT_DEBUG (GST_CAT_PADS, "queryfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (query)); } /** * gst_pad_set_query_type_function: * @pad: the #GstPad to set the query type function for. * @type_func: the #GstPadQueryTypeFunction to set. * * Set the given query type function for the pad. */ void gst_pad_set_query_type_function (GstPad *pad, GstPadQueryTypeFunction type_func) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_QUERYTYPEFUNC (pad) = type_func; GST_CAT_DEBUG (GST_CAT_PADS, "querytypefunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (type_func)); } /** * gst_pad_get_query_types: * @pad: the #GstPad to query * * Get an array of supported queries that can be performed * on this pad. * * Returns: an array of querytypes anded with 0. */ const GstQueryType* gst_pad_get_query_types (GstPad *pad) { GstRealPad *rpad; if (pad == NULL) return FALSE; rpad = GST_PAD_REALIZE (pad); g_return_val_if_fail (rpad, FALSE); if (GST_RPAD_QUERYTYPEFUNC (rpad)) return GST_RPAD_QUERYTYPEFUNC (rpad) (GST_PAD (pad)); return NULL; } static gboolean gst_pad_get_query_types_dispatcher (GstPad *pad, const GstQueryType **data) { *data = gst_pad_get_query_types (pad); return TRUE; } /** * gst_pad_get_query_types_default: * @pad: the #GstPad to query * * Invoke the default dispatcher for the query types on * the pad. * * Returns: an array of querytypes anded with 0. */ const GstQueryType* gst_pad_get_query_types_default (GstPad *pad) { GstQueryType *result = NULL; gst_pad_dispatcher (pad, (GstPadDispatcherFunction) gst_pad_get_query_types_dispatcher, &result); return result; } /** * gst_pad_set_internal_link_function: * @pad: a #GstPad to set the internal link function for. * @intlink: the #GstPadIntLinkFunction to set. * * Sets the given internal link function for the pad. */ void gst_pad_set_internal_link_function (GstPad *pad, GstPadIntLinkFunction intlink) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_INTLINKFUNC (pad) = intlink; GST_CAT_DEBUG (GST_CAT_PADS, "internal link for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (intlink)); } /** * gst_pad_set_formats_function: * @pad: the #GstPad to set the formats function for. * @formats: the #GstPadFormatsFunction to set. * * Sets the given formats function for the pad. */ void gst_pad_set_formats_function (GstPad *pad, GstPadFormatsFunction formats) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_FORMATSFUNC (pad) = formats; GST_CAT_DEBUG (GST_CAT_PADS, "formats function for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (formats)); } /** * gst_pad_set_link_function: * @pad: a #GstPad to set the link function for. * @link: the #GstPadLinkFunction to set. * * Sets the given link function for the pad. It will be called * when the pad is linked or relinked with caps. */ void gst_pad_set_link_function (GstPad *pad, GstPadLinkFunction link) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_LINKFUNC (pad) = link; GST_CAT_DEBUG (GST_CAT_PADS, "linkfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (link)); } /** * gst_pad_set_unlink_function: * @pad: a #GstPad to set the unlink function for. * @unlink: the #GstPadUnlinkFunction to set. * * Sets the given unlink function for the pad. It will be called * when the pad is unlinked. */ void gst_pad_set_unlink_function (GstPad *pad, GstPadUnlinkFunction unlink) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_UNLINKFUNC (pad) = unlink; GST_CAT_DEBUG (GST_CAT_PADS, "unlinkfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (unlink)); } /** * gst_pad_set_fixate_function: * @pad: a #GstPad to set the fixate function for. * @getcaps: the #GstPadFixateFunction to set. * * Sets the given fixate function for the pad. */ void gst_pad_set_fixate_function (GstPad *pad, GstPadFixateFunction fixate) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_FIXATEFUNC (pad) = fixate; GST_CAT_DEBUG (GST_CAT_PADS, "fixatefunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (fixate)); } /** * gst_pad_set_getcaps_function: * @pad: a #GstPad to set the getcaps function for. * @getcaps: the #GstPadGetCapsFunction to set. * * Sets the given getcaps function for the pad. */ void gst_pad_set_getcaps_function (GstPad *pad, GstPadGetCapsFunction getcaps) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_GETCAPSFUNC (pad) = getcaps; GST_CAT_DEBUG (GST_CAT_PADS, "getcapsfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (getcaps)); } /** * gst_pad_set_bufferalloc_function: * @pad: a #GstPad to set the bufferalloc function for. * @bufalloc: the #GstPadBufferPoolFunction to set. * * Sets the given bufferalloc function for the pad. Note that the * bufferalloc function can only be set on sinkpads. */ void gst_pad_set_bufferalloc_function (GstPad *pad, GstPadBufferAllocFunction bufalloc) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); g_return_if_fail (GST_PAD_IS_SINK (pad)); GST_RPAD_BUFFERALLOCFUNC (pad) = bufalloc; GST_CAT_DEBUG (GST_CAT_PADS, "bufferallocfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (bufalloc)); } /** * gst_pad_unlink: * @srcpad: the source #GstPad to unlink. * @sinkpad: the sink #GstPad to unlink. * * Unlinks the source pad from the sink pad. */ void gst_pad_unlink (GstPad *srcpad, GstPad *sinkpad) { GstRealPad *realsrc, *realsink; GstScheduler *src_sched, *sink_sched; /* generic checks */ g_return_if_fail (srcpad != NULL); g_return_if_fail (GST_IS_PAD (srcpad)); g_return_if_fail (sinkpad != NULL); g_return_if_fail (GST_IS_PAD (sinkpad)); GST_CAT_INFO (GST_CAT_ELEMENT_PADS, "unlinking %s:%s(%p) and %s:%s(%p)", GST_DEBUG_PAD_NAME (srcpad), srcpad, GST_DEBUG_PAD_NAME (sinkpad), sinkpad); /* now we need to deal with the real/ghost stuff */ realsrc = GST_PAD_REALIZE (srcpad); realsink = GST_PAD_REALIZE (sinkpad); g_return_if_fail (GST_RPAD_PEER (realsrc) != NULL); g_return_if_fail (GST_RPAD_PEER (realsink) == realsrc); if ((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SINK) && (GST_RPAD_DIRECTION (realsink) == GST_PAD_SRC)) { GstRealPad *temppad; temppad = realsrc; realsrc = realsink; realsink = temppad; } g_return_if_fail ((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SRC) && (GST_RPAD_DIRECTION (realsink) == GST_PAD_SINK)); if (GST_RPAD_UNLINKFUNC (realsrc)) { GST_RPAD_UNLINKFUNC (realsrc) (GST_PAD (realsrc)); } if (GST_RPAD_UNLINKFUNC (realsink)) { GST_RPAD_UNLINKFUNC (realsink) (GST_PAD (realsink)); } /* get the schedulers before we unlink */ src_sched = gst_pad_get_scheduler (GST_PAD (realsrc)); sink_sched = gst_pad_get_scheduler (GST_PAD (realsink)); 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)); } struct _GstPadLink { GType type; gboolean negotiated; gboolean srcnotify; gboolean sinknotify; GstPad *srcpad; GstPad *sinkpad; GstCaps *srccaps; GstCaps *sinkcaps; GstCaps *filtercaps; GstCaps *caps; GstPadFixateFunction app_fixate; }; static gboolean gst_pad_check_schedulers (GstRealPad *realsrc, GstRealPad *realsink) { GstScheduler *src_sched, *sink_sched; gint num_decoupled = 0; src_sched = gst_pad_get_scheduler (GST_PAD (realsrc)); sink_sched = gst_pad_get_scheduler (GST_PAD (realsink)); if (src_sched && sink_sched) { if (GST_FLAG_IS_SET (GST_PAD_PARENT (realsrc), GST_ELEMENT_DECOUPLED)) num_decoupled++; if (GST_FLAG_IS_SET (GST_PAD_PARENT (realsink), GST_ELEMENT_DECOUPLED)) num_decoupled++; if (src_sched != sink_sched && num_decoupled != 1) { return FALSE; } } return TRUE; } #define GST_PAD_LINK_SRC(pad) ((GST_PAD_IS_SRC (pad)) ? (pad) : GST_PAD_PEER (pad)) #define GST_PAD_LINK_SINK(pad) ((GST_PAD_IS_SINK (pad)) ? (pad) : GST_PAD_PEER (pad)) static GstPadLink * gst_pad_link_new (void) { GstPadLink *link; link = g_new0 (GstPadLink, 1); link->sinknotify = TRUE; link->srcnotify = TRUE; return link; } static void gst_pad_link_free (GstPadLink *link) { if (link->srccaps) gst_caps_free (link->srccaps); if (link->sinkcaps) gst_caps_free (link->sinkcaps); if (link->filtercaps) gst_caps_free (link->filtercaps); if (link->caps) gst_caps_free (link->caps); g_free (link); } static void gst_pad_link_intersect (GstPadLink *link) { GstCaps *pad_intersection; if (link->caps) gst_caps_free (link->caps); GST_DEBUG ("intersecting link from %s:%s to %s:%s", GST_DEBUG_PAD_NAME (link->srcpad), GST_DEBUG_PAD_NAME (link->sinkpad)); GST_DEBUG_CAPS ("srccaps", link->srccaps); GST_DEBUG_CAPS ("sinkcaps", link->sinkcaps); GST_DEBUG_CAPS ("filtercaps", link->filtercaps); pad_intersection = gst_caps_intersect (link->srccaps, link->sinkcaps); if (link->filtercaps) { GST_DEBUG_CAPS ("unfiltered intersection", pad_intersection); link->caps = gst_caps_intersect (pad_intersection, link->filtercaps); gst_caps_free (pad_intersection); } else { link->caps = pad_intersection; } GST_DEBUG_CAPS ("intersection", link->caps); } static gboolean gst_pad_link_ready_for_negotiation (GstPadLink *link) { GstElement *parent; parent = GST_PAD_PARENT (link->srcpad); if (!parent || GST_STATE (parent) < GST_STATE_READY) { GST_DEBUG ("parent %s of pad %s:%s is not READY", GST_ELEMENT_NAME (parent), GST_DEBUG_PAD_NAME (link->srcpad)); return FALSE; } parent = GST_PAD_PARENT (link->sinkpad); if (!parent || GST_STATE (parent) < GST_STATE_READY) { GST_DEBUG ("parent %s of pad %s:%s is not READY", GST_ELEMENT_NAME (parent), GST_DEBUG_PAD_NAME (link->sinkpad)); return FALSE; } return TRUE; } static void gst_pad_link_fixate (GstPadLink *link) { GstCaps *caps; GstCaps *newcaps; caps = link->caps; g_return_if_fail (caps != NULL); g_return_if_fail (!gst_caps_is_empty(caps)); GST_DEBUG_CAPS ("trying to fixate caps", caps); while (!gst_caps_is_fixed (caps)) { if (link->app_fixate) { newcaps = (link->app_fixate) (GST_PAD (link->srcpad), caps, NULL); if (newcaps) { caps = newcaps; GST_DEBUG_CAPS ("app fixated to", caps); continue; } } if (GST_RPAD_FIXATEFUNC(link->srcpad)) { newcaps = GST_RPAD_FIXATEFUNC(link->srcpad) (GST_PAD (link->srcpad), caps, NULL); if (newcaps) { caps = newcaps; GST_DEBUG_CAPS ("src pad fixated to", caps); continue; } } if (GST_RPAD_FIXATEFUNC(link->sinkpad)) { newcaps = GST_RPAD_FIXATEFUNC(link->sinkpad) (GST_PAD (link->sinkpad), caps, NULL); if (newcaps) { caps = newcaps; GST_DEBUG_CAPS ("sink pad fixated to", caps); continue; } } caps = _gst_pad_default_fixate_func (GST_PAD(link->srcpad), caps, NULL); GST_DEBUG_CAPS ("core fixated to", caps); } GST_DEBUG_CAPS ("fixate decided on", caps); link->caps = caps; } static gboolean gst_pad_link_call_link_functions (GstPadLink *link) { gboolean negotiating; GstPadLinkReturn res; if (link->srcnotify && GST_RPAD_LINKFUNC (link->srcpad)){ GST_DEBUG ("calling link function on pad %s:%s", GST_DEBUG_PAD_NAME (link->srcpad)); negotiating = GST_FLAG_IS_SET (link->srcpad, GST_PAD_NEGOTIATING); /* set the NEGOTIATING flag if not already done */ if (!negotiating) GST_FLAG_SET (link->srcpad, GST_PAD_NEGOTIATING); /* call the link function */ res = GST_RPAD_LINKFUNC (link->srcpad) (GST_PAD (link->srcpad), link->caps); /* unset again after negotiating only if we set it */ if (!negotiating) GST_FLAG_UNSET (link->srcpad, GST_PAD_NEGOTIATING); GST_DEBUG ("got reply %d from link function on pad %s:%s", res, GST_DEBUG_PAD_NAME (link->srcpad)); if (res == GST_PAD_LINK_REFUSED) { GST_CAT_INFO (GST_CAT_CAPS, "pad %s:%s doesn't accept caps", GST_DEBUG_PAD_NAME (link->srcpad)); return FALSE; } } if (link->sinknotify && GST_RPAD_LINKFUNC (link->sinkpad)){ GST_DEBUG ("calling link function on pad %s:%s", GST_DEBUG_PAD_NAME (link->sinkpad)); negotiating = GST_FLAG_IS_SET (link->sinkpad, GST_PAD_NEGOTIATING); /* set the NEGOTIATING flag if not already done */ if (!negotiating) GST_FLAG_SET (link->sinkpad, GST_PAD_NEGOTIATING); /* call the link function */ res = GST_RPAD_LINKFUNC (link->sinkpad) (GST_PAD (link->sinkpad), link->caps); /* unset again after negotiating only if we set it */ if (!negotiating) GST_FLAG_UNSET (link->sinkpad, GST_PAD_NEGOTIATING); GST_DEBUG ("got reply %d from link function on pad %s:%s", res, GST_DEBUG_PAD_NAME (link->sinkpad)); if (res == GST_PAD_LINK_REFUSED) { GST_CAT_INFO (GST_CAT_CAPS, "pad %s:%s doesn't accept caps", GST_DEBUG_PAD_NAME (link->sinkpad)); return FALSE; } } return TRUE; } static GstPadLinkReturn gst_pad_link_negotiate (GstPadLink *link) { GST_DEBUG ("negotiating link from pad %s:%s to pad %s:%s", GST_DEBUG_PAD_NAME (link->srcpad), GST_DEBUG_PAD_NAME (link->sinkpad)); if (!gst_pad_link_ready_for_negotiation (link)) { return GST_PAD_LINK_DELAYED; } gst_pad_link_intersect (link); if (gst_caps_is_empty (link->caps)) return GST_PAD_LINK_REFUSED; gst_pad_link_fixate (link); if (gst_caps_is_empty (link->caps)) return GST_PAD_LINK_REFUSED; if (!gst_pad_link_call_link_functions (link)) { return GST_PAD_LINK_REFUSED; } return GST_PAD_LINK_OK; } GstPadLinkReturn gst_pad_renegotiate (GstPad *pad) { GstPadLink *link; GstPadLinkReturn ret; g_return_val_if_fail (pad != NULL, GST_PAD_LINK_REFUSED); g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_LINK_REFUSED); g_return_val_if_fail (GST_PAD_LINK_SRC (pad), GST_PAD_LINK_REFUSED); g_return_val_if_fail (GST_PAD_LINK_SINK (pad), GST_PAD_LINK_REFUSED); link = gst_pad_link_new (); link->srcpad = GST_PAD_LINK_SRC (pad); link->sinkpad = GST_PAD_LINK_SINK (pad); if (!gst_pad_link_ready_for_negotiation (link)) { gst_pad_link_free (link); return GST_PAD_LINK_DELAYED; } if (GST_REAL_PAD(pad)->link->filtercaps) { link->filtercaps = gst_caps_copy (GST_REAL_PAD(pad)->link->filtercaps); } link->srccaps = gst_pad_get_caps (link->srcpad); link->sinkcaps = gst_pad_get_caps (link->sinkpad); ret = gst_pad_link_negotiate (link); if (GST_PAD_LINK_FAILED (ret)) { gst_pad_link_free (link); } return ret; } GstPadLinkReturn gst_pad_try_set_caps (GstPad *pad, const GstCaps *caps) { GstPadLink *link; GstPadLinkReturn ret; g_return_val_if_fail (pad != NULL, GST_PAD_LINK_REFUSED); g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_LINK_REFUSED); g_return_val_if_fail (!GST_FLAG_IS_SET (pad, GST_PAD_NEGOTIATING), GST_PAD_LINK_REFUSED); /* setting non-fixed caps on a pad is not allowed */ if (!gst_caps_is_fixed (caps)) { GST_CAT_INFO (GST_CAT_CAPS, "trying to set unfixed caps on pad %s:%s, not allowed", GST_DEBUG_PAD_NAME (pad)); g_warning ("trying to set non fixed caps on pad %s:%s, not allowed", GST_DEBUG_PAD_NAME (pad)); gst_caps_debug (caps, "unfixed caps"); return GST_PAD_LINK_REFUSED; } /* we allow setting caps on non-linked pads. It's ignored */ if (!GST_PAD_PEER (pad)) { return GST_PAD_LINK_OK; } 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); } if (link->srcpad == pad) { link->srccaps = gst_caps_copy(caps); link->sinkcaps = gst_pad_get_allowed_caps (link->sinkpad); link->srcnotify = FALSE; } else { link->srccaps = gst_pad_get_allowed_caps (link->srcpad); link->sinkcaps = gst_caps_copy(caps); link->sinknotify = FALSE; } ret = gst_pad_link_negotiate (link); if (GST_PAD_LINK_FAILED (ret)) { gst_pad_link_free (link); } return ret; } /** * gst_pad_can_link_filtered: * @srcpad: the source #GstPad to link. * @sinkpad: the sink #GstPad to link. * @filtercaps: the filter #GstCaps. * * Checks if the source pad and the sink pad can be linked when constrained * by the given filter caps. * * Returns: TRUE if the pads can be linked, FALSE otherwise. */ gboolean gst_pad_can_link_filtered (GstPad *srcpad, GstPad *sinkpad, const GstCaps *filtercaps) { GstRealPad *realsrc, *realsink; GstPadLink *link; /* FIXME This function is gross. It's almost a direct copy of * gst_pad_link_filtered(). Any decent programmer would attempt * to merge the two functions, which I will do some day. --ds */ /* generic checks */ g_return_val_if_fail (srcpad != NULL, FALSE); g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE); g_return_val_if_fail (sinkpad != NULL, FALSE); g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE); GST_CAT_INFO (GST_CAT_PADS, "trying to link %s:%s and %s:%s", GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad)); /* now we need to deal with the real/ghost stuff */ realsrc = GST_PAD_REALIZE (srcpad); realsink = GST_PAD_REALIZE (sinkpad); if ((GST_PAD (realsrc) != srcpad) || (GST_PAD (realsink) != sinkpad)) { GST_CAT_INFO (GST_CAT_PADS, "*actually* linking %s:%s and %s:%s", GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink)); } /* FIXME: shouldn't we convert this to g_return_val_if_fail? */ if (GST_RPAD_PEER (realsrc) != NULL) { GST_CAT_INFO (GST_CAT_PADS, "Real source pad %s:%s has a peer, failed", GST_DEBUG_PAD_NAME (realsrc)); return FALSE; } if (GST_RPAD_PEER (realsink) != NULL) { GST_CAT_INFO (GST_CAT_PADS, "Real sink pad %s:%s has a peer, failed", GST_DEBUG_PAD_NAME (realsink)); return FALSE; } if (GST_PAD_PARENT (realsrc) == NULL) { GST_CAT_INFO (GST_CAT_PADS, "Real src pad %s:%s has no parent, failed", GST_DEBUG_PAD_NAME (realsrc)); return FALSE; } if (GST_PAD_PARENT (realsink) == NULL) { GST_CAT_INFO (GST_CAT_PADS, "Real sink pad %s:%s has no parent, failed", GST_DEBUG_PAD_NAME (realsrc)); return FALSE; } if (!gst_pad_check_schedulers (realsrc, realsink)) { g_warning ("linking pads with different scheds requires " "exactly one decoupled element (such as queue)"); return FALSE; } g_return_val_if_fail (realsrc != NULL, GST_PAD_LINK_REFUSED); g_return_val_if_fail (realsink != NULL, GST_PAD_LINK_REFUSED); link = gst_pad_link_new (); if (GST_RPAD_DIRECTION (realsrc) == GST_PAD_SRC) { link->srcpad = GST_PAD (realsrc); link->sinkpad = GST_PAD (realsink); } else { link->srcpad = GST_PAD (realsink); link->sinkpad = GST_PAD (realsrc); } if (GST_RPAD_DIRECTION (link->srcpad) != GST_PAD_SRC) { GST_CAT_INFO (GST_CAT_PADS, "Real src pad %s:%s is not a source pad, failed", GST_DEBUG_PAD_NAME (link->srcpad)); gst_pad_link_free (link); return FALSE; } if (GST_RPAD_DIRECTION (link->sinkpad) != GST_PAD_SINK) { GST_CAT_INFO (GST_CAT_PADS, "Real sink pad %s:%s is not a sink pad, failed", GST_DEBUG_PAD_NAME (link->sinkpad)); gst_pad_link_free (link); return FALSE; } link->srccaps = gst_pad_get_caps (link->srcpad); link->sinkcaps = gst_pad_get_caps (link->sinkpad); if (filtercaps) link->filtercaps = gst_caps_copy (filtercaps); gst_pad_link_intersect (link); if (gst_caps_is_empty (link->caps)) return FALSE; return TRUE; } /** * gst_pad_can_link: * @srcpad: the source #GstPad to link. * @sinkpad: the sink #GstPad to link. * * Checks if the source pad and the sink pad can be link. * * Returns: TRUE if the pads can be linked, FALSE otherwise. */ gboolean gst_pad_can_link (GstPad *srcpad, GstPad *sinkpad) { return gst_pad_can_link_filtered (srcpad, sinkpad, NULL); } /** * gst_pad_link_filtered: * @srcpad: the source #GstPad to link. * @sinkpad: the sink #GstPad to link. * @filtercaps: the filter #GstCaps. * * Links the source pad and the sink pad, constrained * by the given filter caps. This function sinks the caps. * * Returns: TRUE if the pads have been linked, FALSE otherwise. */ gboolean gst_pad_link_filtered (GstPad *srcpad, GstPad *sinkpad, const GstCaps *filtercaps) { GstRealPad *realsrc, *realsink; GstScheduler *src_sched, *sink_sched; GstPadLink *link; GstPadLinkReturn ret; /* 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); ret = gst_pad_link_negotiate (link); if (ret == GST_PAD_LINK_REFUSED) { gst_pad_link_free (link); return FALSE; } GST_RPAD_PEER (link->srcpad) = GST_REAL_PAD(link->sinkpad); GST_RPAD_PEER (link->sinkpad) = GST_REAL_PAD(link->srcpad); GST_RPAD_LINK (link->srcpad) = link; GST_RPAD_LINK (link->sinkpad) = link; /* fire off a signal to each of the pads telling them * that they've been linked */ g_signal_emit (G_OBJECT (link->srcpad), gst_real_pad_signals[REAL_LINKED], 0, link->sinkpad); g_signal_emit (G_OBJECT (link->sinkpad), gst_real_pad_signals[REAL_LINKED], 0, link->srcpad); src_sched = gst_pad_get_scheduler (GST_PAD (link->srcpad)); sink_sched = gst_pad_get_scheduler (GST_PAD (link->sinkpad)); /* now tell the scheduler */ if (src_sched && src_sched == sink_sched) { gst_scheduler_pad_link (src_sched, GST_PAD (link->srcpad), GST_PAD (link->sinkpad)); } else { GST_CAT_INFO (GST_CAT_PADS, "not telling link to scheduler %s:%s and %s:%s, %p %p", GST_DEBUG_PAD_NAME (link->srcpad), GST_DEBUG_PAD_NAME (link->sinkpad), src_sched, sink_sched); } GST_CAT_INFO (GST_CAT_PADS, "linked %s:%s and %s:%s, successful", GST_DEBUG_PAD_NAME (link->srcpad), GST_DEBUG_PAD_NAME (link->sinkpad)); return TRUE; } /** * gst_pad_link: * @srcpad: the source #GstPad to link. * @sinkpad: the sink #GstPad to link. * * Links the source pad to the sink pad. * * Returns: TRUE if the pad could be linked, FALSE otherwise. */ gboolean gst_pad_link (GstPad *srcpad, GstPad *sinkpad) { return gst_pad_link_filtered (srcpad, sinkpad, NULL); } /** * gst_pad_set_parent: * @pad: a #GstPad to set the parent of. * @parent: the new parent #GstElement. * * Sets the parent object of a pad. */ void gst_pad_set_parent (GstPad *pad, GstElement *parent) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_PAD (pad)); g_return_if_fail (GST_PAD_PARENT (pad) == NULL); g_return_if_fail (parent != NULL); g_return_if_fail (GST_IS_OBJECT (parent)); g_return_if_fail ((gpointer) pad != (gpointer) parent); gst_object_set_parent (GST_OBJECT (pad), GST_OBJECT (parent)); } /** * gst_pad_get_parent: * @pad: the #GstPad to get the parent of. * * Gets the parent object of this pad. * * Returns: the parent #GstElement. */ GstElement* gst_pad_get_parent (GstPad *pad) { g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); return GST_PAD_PARENT (pad); } static void gst_pad_set_pad_template (GstPad *pad, GstPadTemplate *templ) { /* this function would need checks if it weren't static */ gst_object_replace ((GstObject **) &pad->padtemplate, (GstObject *) templ); if (templ) g_signal_emit (G_OBJECT (templ), gst_pad_template_signals[TEMPL_PAD_CREATED], 0, pad); } /** * gst_pad_get_pad_template: * @pad: a #GstPad to get the pad template of. * * Gets the pad template object of this pad. * * Returns: the #GstPadTemplate from which this pad was instantiated. */ GstPadTemplate* gst_pad_get_pad_template (GstPad *pad) { g_return_val_if_fail (GST_IS_PAD (pad), NULL); return GST_PAD_PAD_TEMPLATE (pad); } /** * gst_pad_get_scheduler: * @pad: a #GstPad to get the scheduler of. * * Gets the scheduler of the pad. Since the pad does not * have a scheduler of its own, the scheduler of the parent * is taken. For decoupled pads, the scheduler of the peer * parent is taken. * * Returns: the #GstScheduler of the pad. */ GstScheduler* gst_pad_get_scheduler (GstPad *pad) { GstScheduler *scheduler = NULL; GstElement *parent; g_return_val_if_fail (GST_IS_PAD (pad), NULL); parent = gst_pad_get_parent (pad); if (parent) { if (GST_FLAG_IS_SET (parent, GST_ELEMENT_DECOUPLED)) { GstRealPad *peer = GST_RPAD_PEER (pad); if (peer) { scheduler = gst_element_get_scheduler (gst_pad_get_parent (GST_PAD (peer))); } } else { scheduler = gst_element_get_scheduler (parent); } } return scheduler; } /** * gst_pad_get_real_parent: * @pad: a #GstPad to get the real parent of. * * Gets the real parent object of this pad. If the pad * is a ghost pad, the actual owner of the real pad is * returned, as opposed to #gst_pad_get_parent(). * * Returns: the parent #GstElement. */ GstElement* gst_pad_get_real_parent (GstPad *pad) { g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); return GST_PAD_PARENT (GST_PAD (GST_PAD_REALIZE (pad))); } /** * gst_pad_add_ghost_pad: * @pad: a #GstPad to attach the ghost pad to. * @ghostpad: the ghost #GstPad to to the pad. * * Adds a ghost pad to a pad. */ void gst_pad_add_ghost_pad (GstPad *pad, GstPad *ghostpad) { GstRealPad *realpad; g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_PAD (pad)); g_return_if_fail (ghostpad != NULL); g_return_if_fail (GST_IS_GHOST_PAD (ghostpad)); realpad = GST_PAD_REALIZE (pad); realpad->ghostpads = g_list_prepend (realpad->ghostpads, ghostpad); } /** * gst_pad_remove_ghost_pad: * @pad: a #GstPad to remove the ghost pad from. * @ghostpad: the ghost #GstPad to remove from the pad. * * Removes a ghost pad from a pad. */ void gst_pad_remove_ghost_pad (GstPad *pad, GstPad *ghostpad) { GstRealPad *realpad; g_return_if_fail (GST_IS_PAD (pad)); g_return_if_fail (GST_IS_GHOST_PAD (ghostpad)); realpad = GST_PAD_REALIZE (pad); g_return_if_fail (GST_GPAD_REALPAD (ghostpad) == realpad); realpad->ghostpads = g_list_remove (realpad->ghostpads, ghostpad); GST_GPAD_REALPAD (ghostpad) = NULL; } /** * gst_pad_get_ghost_pad_list: * @pad: a #GstPad to get the ghost pads of. * * Gets the ghost pads of this pad. * * Returns: a #GList of ghost pads. */ GList* gst_pad_get_ghost_pad_list (GstPad *pad) { g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); return GST_PAD_REALIZE(pad)->ghostpads; } static gboolean _gst_pad_default_fixate_foreach (GQuark field_id, GValue *value, gpointer s) { GstStructure *structure = (GstStructure *)s; GType type = G_VALUE_TYPE (value); if (G_TYPE_IS_FUNDAMENTAL (type) || type == GST_TYPE_FOURCC) return TRUE; if (type == GST_TYPE_INT_RANGE) { gst_structure_set (structure, g_quark_to_string (field_id), G_TYPE_INT, gst_value_get_int_range_min (value), NULL); return FALSE; } if (type == GST_TYPE_DOUBLE_RANGE) { gst_structure_set (structure, g_quark_to_string (field_id), G_TYPE_DOUBLE, gst_value_get_double_range_min (value), NULL); return FALSE; } if (type == GST_TYPE_LIST) { gst_structure_set_value (structure, g_quark_to_string (field_id), gst_value_list_get_value (value, 0)); return FALSE; } g_critical ("don't know how to fixate type %s", g_type_name(type)); return TRUE; } static GstCaps * _gst_pad_default_fixate_func (GstPad *pad, GstCaps *caps, gpointer unused) { static GstStaticCaps octetcaps = GST_STATIC_CAPS ( "application/octet-stream"); GstStructure *structure; 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)) { gst_caps_free (caps); return gst_caps_copy (gst_static_caps_get (&octetcaps)); } if (caps->structs->len > 1) { GstCaps *retcaps = gst_caps_copy_1 (caps); gst_caps_free (caps); return retcaps; } structure = gst_caps_get_structure (caps, 0); gst_structure_foreach (structure, _gst_pad_default_fixate_foreach, structure); return caps; } /** * gst_pad_perform_negotiate: * @srcpad: the source #GstPad. * @sinkpad: the sink #GstPad. * * Tries to negotiate the pads. * * Returns: TRUE if the pads were succesfully negotiated, FALSE otherwise. */ gboolean gst_pad_perform_negotiate (GstPad *srcpad, GstPad *sinkpad) { return gst_pad_renegotiate (srcpad); } /** * 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) { g_warning ("unimplemented"); return FALSE; } /** * 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) { g_warning ("unimplemented"); return FALSE; } /** * gst_pad_proxy_getcaps: * @pad: a #GstPad to proxy. * * Calls gst_pad_get_allowed_caps() for every other pad belonging to the * same element as @pad, and returns the intersection of the results. * * This function is useful as a default getcaps function for an element * that can handle any stream format, but requires all its pads to have * the same caps. Two such elements are tee and aggregator. * * Returns: the intersection of the other pads' allowed caps. */ GstCaps * gst_pad_proxy_getcaps (GstPad *pad) { GstElement *element; const GList *pads; GstCaps *caps; GST_DEBUG ("proxying getcaps for %s:%s\n", GST_DEBUG_PAD_NAME (pad)); element = gst_pad_get_parent (pad); pads = gst_element_get_pad_list (element); caps = gst_caps_new_any (); while (pads) { GstPad *otherpad = GST_PAD (pads->data); GstCaps *temp; if (otherpad != pad) { temp = gst_caps_intersect (caps, gst_pad_get_allowed_caps (otherpad)); gst_caps_free (caps); caps = temp; } pads = g_list_next (pads); } return caps; } /** * gst_pad_proxy_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_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 (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); realpad = GST_PAD_REALIZE (pad); GST_CAT_DEBUG (GST_CAT_CAPS, "get pad caps of %s:%s (%p)", GST_DEBUG_PAD_NAME (realpad), realpad); if (GST_RPAD_GETCAPSFUNC (realpad)) { GstCaps *caps; GST_CAT_DEBUG (GST_CAT_CAPS, "using pad get function"); caps = GST_RPAD_GETCAPSFUNC (realpad) (GST_PAD (realpad)); if (caps == NULL) { g_critical ("pad %s:%s returned NULL caps from getcaps function\n", GST_ELEMENT_NAME(GST_PAD_PARENT(GST_PAD (realpad))), GST_PAD_NAME(realpad)); caps = gst_caps_new_any (); } return caps; } else if (GST_PAD_PAD_TEMPLATE (realpad)) { GstPadTemplate *templ = GST_PAD_PAD_TEMPLATE (realpad); GST_CAT_DEBUG (GST_CAT_CAPS, "using pad template %p with caps %p", templ, GST_PAD_TEMPLATE_CAPS (templ)); return gst_caps_copy (GST_PAD_TEMPLATE_CAPS (templ)); } GST_CAT_DEBUG (GST_CAT_CAPS, "pad has no caps"); #if 0 /* FIXME this should be enabled some day */ g_warning("pad %s:%s (%p) has no pad template\n", GST_DEBUG_PAD_NAME (realpad), realpad); #endif return gst_caps_new_any(); } /** * gst_pad_get_pad_template_caps: * @pad: a #GstPad to get the template capabilities from. * * Gets the template capabilities of this pad. * * Returns: the template #GstCaps of this pad, unref the caps * if you no longer need it. */ const GstCaps* gst_pad_get_pad_template_caps (GstPad *pad) { static GstStaticCaps anycaps = GST_STATIC_CAPS ("ANY"); g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); if (GST_PAD_PAD_TEMPLATE (pad)) return GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (pad)); #if 0 /* FIXME this should be enabled some day */ g_warning("pad %s:%s (%p) has no pad template\n", GST_DEBUG_PAD_NAME (realpad), realpad); #endif return gst_static_caps_get(&anycaps); } /** * gst_pad_template_get_caps_by_name: * @templ: a #GstPadTemplate to get the capabilities of. * @name: the name of the capability to get. * * Gets the capability with the given name from this pad template. * * Returns: the #GstCaps, or NULL if not found or in case of an error. unref * the caps if you no longer need it. */ const GstCaps* gst_pad_template_get_caps_by_name (GstPadTemplate *templ, const gchar *name) { GstCaps *caps; g_return_val_if_fail (templ != NULL, NULL); caps = GST_PAD_TEMPLATE_CAPS (templ); if (!caps) return NULL; /* FIXME */ //return gst_caps_copy (gst_caps_get_by_name (caps, name)); return NULL; } /** * gst_pad_check_compatibility: * @srcpad: the source #GstPad to check. * @sinkpad: the sink #GstPad to check against. * * Checks if two pads have compatible capabilities. * * Returns: TRUE if they are compatible or if the capabilities * could not be checked */ gboolean gst_pad_check_compatibility (GstPad *srcpad, GstPad *sinkpad) { g_return_val_if_fail (srcpad != NULL, FALSE); g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE); g_return_val_if_fail (sinkpad != NULL, FALSE); g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE); if (GST_PAD_CAPS (srcpad) && GST_PAD_CAPS (sinkpad)) { if (!gst_caps_is_always_compatible (GST_PAD_CAPS (srcpad), GST_PAD_CAPS (sinkpad))) { return FALSE; } else { return TRUE; } } else { GST_CAT_DEBUG (GST_CAT_PADS, "could not check capabilities of pads (%s:%s) and (%s:%s) %p %p", GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad), GST_PAD_CAPS (srcpad), GST_PAD_CAPS (sinkpad)); return TRUE; } } /** * gst_pad_get_peer: * @pad: a #GstPad to get the peer of. * * Gets the peer pad of this pad. * * Returns: the peer #GstPad. */ GstPad* gst_pad_get_peer (GstPad *pad) { g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); return GST_PAD (GST_PAD_PEER (pad)); } /** * gst_pad_get_allowed_caps: * @pad: a #GstPad to get the allowed caps of. * * Gets the capabilities of the allowed media types that can * flow through this pad. The caller must free the resulting caps. * * Returns: the allowed #GstCaps of the pad link. Free the caps when * you no longer need it. */ GstCaps* gst_pad_get_allowed_caps (GstPad *pad) { GstRealPad *realpad; const GstCaps *mycaps; GstCaps *caps; GstCaps *peercaps; GstCaps *icaps; GstPadLink *link; g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); realpad = GST_PAD_REALIZE (pad); GST_CAT_DEBUG (GST_CAT_PROPERTIES, "get allowed caps of %s:%s", GST_DEBUG_PAD_NAME (pad)); mycaps = gst_pad_get_pad_template_caps (pad); if (GST_RPAD_PEER (realpad) == NULL) { return gst_caps_copy (mycaps); } peercaps = gst_pad_get_caps (GST_PAD_PEER (realpad)); caps = gst_caps_intersect (mycaps, peercaps); gst_caps_free (peercaps); link = GST_RPAD_LINK (realpad); if (link->filtercaps) { icaps = gst_caps_intersect (caps, link->filtercaps); gst_caps_free (caps); return icaps; } else { return caps; } } void gst_pad_caps_change_notify (GstPad *pad) { /* call this to indicate that the return value of getcaps may have * changed, and a renegotiation is suggested */ } /** * gst_pad_recover_caps_error: * @pad: a #GstPad that had a failed capsnego * @allowed: possible caps for the link * * Attempt to recover from a failed caps negotiation. This function * is typically called by a plugin that exhausted its list of caps * and wants the application to resolve the issue. The application * should connect to the pad's caps_nego_failed signal and should * resolve the issue by connecting another element for example. * * Returns: TRUE when the issue was resolved, dumps detailed information * on the console and returns FALSE otherwise. */ gboolean gst_pad_recover_caps_error (GstPad *pad, const GstCaps *allowed) { 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_alloc_buffer: * @pad: a #GstPad to get the buffer from. * * Allocates a new, empty buffer optimized to push to pad #pad. This * function only works if #pad is a src pad. * * Returns: a new, empty #GstBuffer, or NULL if there is an error */ GstBuffer* gst_pad_alloc_buffer (GstPad *pad, guint64 offset, gint size) { GstRealPad *peer; g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); g_return_val_if_fail (GST_PAD_IS_SRC (pad), NULL); peer = GST_RPAD_PEER (pad); if (!peer) return NULL; GST_CAT_DEBUG (GST_CAT_BUFFER, "(%s:%s): getting buffer", GST_DEBUG_PAD_NAME (pad)); if (peer->bufferallocfunc) { GST_CAT_DEBUG (GST_CAT_PADS, "calling bufferallocfunc &%s (@%p) of peer pad %s:%s", GST_DEBUG_FUNCPTR_NAME (peer->bufferallocfunc), &peer->bufferallocfunc, GST_DEBUG_PAD_NAME (((GstPad*) peer))); return (peer->bufferallocfunc) (GST_PAD (peer), offset, size); } else { return gst_buffer_new_and_alloc(size); } } static void gst_real_pad_dispose (GObject *object) { GstPad *pad = GST_PAD (object); /* No linked pad can ever be disposed. * It has to have a parent to be linked * and a parent would hold a reference */ g_assert (GST_PAD_PEER (pad) == NULL); GST_CAT_DEBUG (GST_CAT_REFCOUNTING, "dispose %s:%s", GST_DEBUG_PAD_NAME(pad)); /* we destroy the ghostpads, because they are nothing without the real pad */ if (GST_REAL_PAD (pad)->ghostpads) { GList *orig, *ghostpads; orig = ghostpads = g_list_copy (GST_REAL_PAD (pad)->ghostpads); while (ghostpads) { GstPad *ghostpad = GST_PAD (ghostpads->data); if (GST_IS_ELEMENT (GST_OBJECT_PARENT (ghostpad))){ GST_CAT_DEBUG (GST_CAT_REFCOUNTING, "removing ghost pad from element '%s'", GST_OBJECT_NAME (GST_OBJECT_PARENT (ghostpad))); gst_element_remove_ghost_pad (GST_ELEMENT (GST_OBJECT_PARENT (ghostpad)), GST_PAD (ghostpad)); } ghostpads = g_list_next (ghostpads); } g_list_free (orig); g_list_free (GST_REAL_PAD(pad)->ghostpads); } 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_CAT_DEBUG (GST_CAT_REFCOUNTING, "removing pad from element '%s'", GST_OBJECT_NAME (GST_OBJECT (GST_ELEMENT (GST_OBJECT_PARENT (pad))))); gst_element_remove_pad (GST_ELEMENT (GST_OBJECT_PARENT (pad)), pad); } G_OBJECT_CLASS (real_pad_parent_class)->dispose (object); } #ifndef GST_DISABLE_LOADSAVE /* FIXME: why isn't this on a GstElement ? */ /** * gst_pad_load_and_link: * @self: an #xmlNodePtr to read the description from. * @parent: the #GstObject element that owns the pad. * * Reads the pad definition from the XML node and links the given pad * in the element to a pad of an element up in the hierarchy. */ void gst_pad_load_and_link (xmlNodePtr self, GstObject *parent) { xmlNodePtr field = self->xmlChildrenNode; GstPad *pad = NULL, *targetpad; gchar *peer = NULL; gchar **split; GstElement *target; GstObject *grandparent; while (field) { if (!strcmp (field->name, "name")) { pad = gst_element_get_pad (GST_ELEMENT (parent), xmlNodeGetContent (field)); } else if (!strcmp(field->name, "peer")) { peer = xmlNodeGetContent (field); } field = field->next; } g_return_if_fail (pad != NULL); if (peer == NULL) return; split = g_strsplit (peer, ".", 2); if (split[0] == NULL || split[1] == NULL) { GST_CAT_DEBUG (GST_CAT_XML, "Could not parse peer '%s' for pad %s:%s, leaving unlinked", peer, GST_DEBUG_PAD_NAME (pad)); return; } g_return_if_fail (split[0] != NULL); g_return_if_fail (split[1] != NULL); grandparent = gst_object_get_parent (parent); if (grandparent && GST_IS_BIN (grandparent)) { target = gst_bin_get_by_name_recurse_up (GST_BIN (grandparent), split[0]); } else goto cleanup; if (target == NULL) goto cleanup; targetpad = gst_element_get_pad (target, split[1]); if (targetpad == NULL) goto cleanup; gst_pad_link (pad, targetpad); cleanup: g_strfreev (split); } /** * gst_pad_save_thyself: * @pad: a #GstPad to save. * @parent: the parent #xmlNodePtr to save the description in. * * Saves the pad into an xml representation. * * Returns: the #xmlNodePtr representation of the pad. */ static xmlNodePtr gst_pad_save_thyself (GstObject *object, xmlNodePtr parent) { GstRealPad *realpad; GstPad *peer; g_return_val_if_fail (GST_IS_REAL_PAD (object), NULL); realpad = GST_REAL_PAD (object); xmlNewChild (parent, NULL, "name", GST_PAD_NAME (realpad)); if (GST_RPAD_PEER (realpad) != NULL) { gchar *content; peer = GST_PAD (GST_RPAD_PEER (realpad)); /* first check to see if the peer's parent's parent is the same */ /* we just save it off */ content = g_strdup_printf ("%s.%s", GST_OBJECT_NAME (GST_PAD_PARENT (peer)), GST_PAD_NAME (peer)); xmlNewChild (parent, NULL, "peer", content); g_free (content); } else xmlNewChild (parent, NULL, "peer", ""); return parent; } /* FIXME: shouldn't pad and ghost be switched ? */ /** * gst_ghost_pad_save_thyself: * @pad: a ghost #GstPad to save. * @parent: the parent #xmlNodePtr to save the description in. * * Saves the ghost pad into an xml representation. * * Returns: the #xmlNodePtr representation of the pad. */ xmlNodePtr gst_ghost_pad_save_thyself (GstPad *pad, xmlNodePtr parent) { xmlNodePtr self; g_return_val_if_fail (GST_IS_GHOST_PAD (pad), NULL); self = xmlNewChild (parent, NULL, "ghostpad", NULL); xmlNewChild (self, NULL, "name", GST_PAD_NAME (pad)); xmlNewChild (self, NULL, "parent", GST_OBJECT_NAME (GST_PAD_PARENT (pad))); /* FIXME FIXME FIXME! */ return self; } #endif /* GST_DISABLE_LOADSAVE */ /** * gst_pad_push: * @pad: a #GstPad to push the buffer out of. * @data: the #GstData to push. * * Pushes a buffer or an event to the peer of the pad. */ void gst_pad_push (GstPad *pad, GstData *data) { GstRealPad *peer; g_return_if_fail (GST_IS_PAD (pad)); g_return_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SRC); g_return_if_fail (data != NULL); if (!gst_probe_dispatcher_dispatch (&(GST_REAL_PAD (pad)->probedisp), &data)) return; if (!GST_PAD_IS_LINKED (pad)) { GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, pad, "not pushing data %p as pad is unconnected", data); gst_data_unref (data); return; } GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, pad, "pushing"); peer = GST_RPAD_PEER (pad); if (!peer) { g_warning ("push on pad %s:%s but it is unlinked", GST_DEBUG_PAD_NAME (pad)); } else { if (!GST_IS_EVENT (data) && !GST_PAD_IS_ACTIVE (peer)) { g_warning ("push on peer of pad %s:%s but peer is not active", GST_DEBUG_PAD_NAME (pad)); return; } if (peer->chainhandler) { if (data) { GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, pad, "calling chainhandler &%s of peer pad %s:%s", GST_DEBUG_FUNCPTR_NAME (peer->chainhandler), GST_DEBUG_PAD_NAME (GST_PAD (peer))); if (!gst_probe_dispatcher_dispatch (&peer->probedisp, &data)) return; (peer->chainhandler) (GST_PAD (peer), data); return; } else { g_warning ("trying to push a NULL buffer on pad %s:%s", GST_DEBUG_PAD_NAME (peer)); return; } } else { g_warning ("internal error: push on pad %s:%s but it has no chainhandler", GST_DEBUG_PAD_NAME (peer)); } } /* clean up the mess here */ if (data != NULL) gst_data_unref (data); } /** * gst_pad_pull: * @pad: a #GstPad to pull a buffer from. * * Pulls an event or a buffer from the peer pad. * * Returns: a new #GstData from the peer pad. */ GstData* gst_pad_pull (GstPad *pad) { GstRealPad *peer; GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, pad, "pulling"); g_return_val_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SINK, GST_DATA (gst_event_new (GST_EVENT_INTERRUPT))); peer = GST_RPAD_PEER (pad); if (!peer) { gst_element_error (GST_PAD_PARENT (pad), "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_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, pad, "calling gethandler %s of peer pad %s:%s", GST_DEBUG_FUNCPTR_NAME (peer->gethandler), GST_DEBUG_PAD_NAME (peer)); data = (peer->gethandler) (GST_PAD (peer)); if (data) { if (!gst_probe_dispatcher_dispatch (&peer->probedisp, &data)) goto restart; return data; } /* no null buffers allowed */ gst_element_error (GST_PAD_PARENT (pad), "NULL buffer during pull on %s:%s", GST_DEBUG_PAD_NAME (pad)); } 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)); } } return GST_DATA (gst_event_new (GST_EVENT_INTERRUPT)); } /** * gst_pad_selectv: * @padlist: a #GList of pads. * * Waits for a buffer on any of the list of pads. * * Returns: the #GstPad that has a buffer available. * Use #gst_pad_pull() to get the buffer. */ GstPad* gst_pad_selectv (GList *padlist) { GstPad *pad; pad = gst_scheduler_pad_select (GST_PAD_PARENT (padlist->data)->sched, padlist); return pad; } /** * gst_pad_select: * @pad: a first #GstPad to perform the select on. * @...: A NULL-terminated list of more pads to select on. * * Waits for a buffer on the given set of pads. * * Returns: the #GstPad that has a buffer available. * Use #gst_pad_pull() to get the buffer. */ GstPad* gst_pad_select (GstPad *pad, ...) { GstPad *result; va_list var_args; if (pad == NULL) return NULL; va_start (var_args, pad); result = gst_pad_select_valist (pad, var_args); va_end (var_args); return result; } /** * gst_pad_select_valist: * @pad: a first #GstPad to perform the select on. * @varargs: A va_list of more pads to select on. * * Waits for a buffer on the given set of pads. * * Returns: the #GstPad that has a buffer available. * Use #gst_pad_pull() to get the buffer. */ GstPad* gst_pad_select_valist (GstPad *pad, va_list var_args) { GstPad *result; GList *padlist = NULL; if (pad == NULL) return NULL; while (pad) { padlist = g_list_prepend (padlist, pad); pad = va_arg (var_args, GstPad *); } result = gst_pad_selectv (padlist); g_list_free (padlist); return result; } /************************************************************************ * * templates * */ static void gst_pad_template_class_init (GstPadTemplateClass *klass); static void gst_pad_template_init (GstPadTemplate *templ); static void gst_pad_template_dispose (GObject *object); GType gst_pad_template_get_type (void) { static GType padtemplate_type = 0; if (!padtemplate_type) { static const GTypeInfo padtemplate_info = { sizeof (GstPadTemplateClass), NULL, NULL, (GClassInitFunc) gst_pad_template_class_init, NULL, NULL, sizeof (GstPadTemplate), 32, (GInstanceInitFunc) gst_pad_template_init, NULL }; padtemplate_type = g_type_register_static(GST_TYPE_OBJECT, "GstPadTemplate", &padtemplate_info, 0); } return padtemplate_type; } static void gst_pad_template_class_init (GstPadTemplateClass *klass) { GObjectClass *gobject_class; GstObjectClass *gstobject_class; gobject_class = (GObjectClass*) klass; gstobject_class = (GstObjectClass*) klass; padtemplate_parent_class = g_type_class_ref (GST_TYPE_OBJECT); gst_pad_template_signals[TEMPL_PAD_CREATED] = g_signal_new ("pad_created", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstPadTemplateClass, pad_created), NULL, NULL, gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD); gobject_class->dispose = gst_pad_template_dispose; gstobject_class->path_string_separator = "*"; } static void gst_pad_template_init (GstPadTemplate *templ) { } static void gst_pad_template_dispose (GObject *object) { GstPadTemplate *templ = GST_PAD_TEMPLATE (object); g_free (GST_PAD_TEMPLATE_NAME_TEMPLATE (templ)); if (GST_PAD_TEMPLATE_CAPS (templ)) { gst_caps_free (GST_PAD_TEMPLATE_CAPS (templ)); } G_OBJECT_CLASS (padtemplate_parent_class)->dispose (object); } /* ALWAYS padtemplates cannot have conversion specifications, it doesn't make * sense. * SOMETIMES padtemplates can do whatever they want, they are provided by the * element. * REQUEST padtemplates can be reverse-parsed (the user asks for 'sink1', the * 'sink%d' template is automatically selected), so we need to restrict their * naming. */ static gboolean name_is_valid (const gchar *name, GstPadPresence presence) { const gchar *str; if (presence == GST_PAD_ALWAYS) { if (strchr (name, '%')) { g_warning ("invalid name template %s: conversion specifications are not" " allowed for GST_PAD_ALWAYS padtemplates", name); return FALSE; } } else if (presence == GST_PAD_REQUEST) { if ((str = strchr (name, '%')) && strchr (str + 1, '%')) { g_warning ("invalid name template %s: only one conversion specification" " allowed in GST_PAD_REQUEST padtemplate", name); return FALSE; } if (str && (*(str+1) != 's' && *(str+1) != 'd')) { g_warning ("invalid name template %s: conversion specification must be of" " type '%%d' or '%%s' for GST_PAD_REQUEST padtemplate", name); return FALSE; } if (str && (*(str+2) != '\0')) { g_warning ("invalid name template %s: conversion specification must" " appear at the end of the GST_PAD_REQUEST padtemplate name", name); return FALSE; } } return TRUE; } /** * gst_static_pad_template_get: * @pad_template: the static pad template * * Converts a GstStaticPadTemplate into a GstPadTemplate. * * Returns: a new #GstPadTemplate. */ GstPadTemplate* gst_static_pad_template_get (GstStaticPadTemplate *pad_template) { GstPadTemplate *new; if (!name_is_valid (pad_template->name_template, pad_template->presence)) return NULL; new = g_object_new (gst_pad_template_get_type (), "name", pad_template->name_template, NULL); GST_PAD_TEMPLATE_NAME_TEMPLATE (new) = g_strdup (pad_template->name_template); GST_PAD_TEMPLATE_DIRECTION (new) = pad_template->direction; GST_PAD_TEMPLATE_PRESENCE (new) = pad_template->presence; GST_PAD_TEMPLATE_CAPS (new) = gst_caps_copy ( gst_static_caps_get (&pad_template->static_caps)); return new; } /** * gst_pad_template_new: * @name_template: the name template. * @direction: the #GstPadDirection of the template. * @presence: the #GstPadPresence of the pad. * @caps: a #GstCaps set for the template. The caps are taken ownership of. * * Creates a new pad template with a name according to the given template * and with the given arguments. This functions takes ownership of the provided * caps, so be sure to not use them afterwards. * * Returns: a new #GstPadTemplate. */ GstPadTemplate* gst_pad_template_new (const gchar *name_template, GstPadDirection direction, GstPadPresence presence, GstCaps *caps) { GstPadTemplate *new; g_return_val_if_fail (name_template != NULL, NULL); if (!name_is_valid (name_template, presence)) return NULL; new = g_object_new (gst_pad_template_get_type (), "name", name_template, NULL); GST_PAD_TEMPLATE_NAME_TEMPLATE (new) = g_strdup (name_template); GST_PAD_TEMPLATE_DIRECTION (new) = direction; GST_PAD_TEMPLATE_PRESENCE (new) = presence; GST_PAD_TEMPLATE_CAPS (new) = caps; return new; } /** * gst_pad_template_get_caps: * @templ: a #GstPadTemplate to get capabilities of. * * Gets the capabilities of the pad template. * * Returns: the #GstCaps of the pad template. unref the caps * after use. */ const GstCaps* gst_pad_template_get_caps (GstPadTemplate *templ) { g_return_val_if_fail (templ != NULL, NULL); return GST_PAD_TEMPLATE_CAPS (templ); } /** * gst_pad_set_element_private: * @pad: the #GstPad to set the private data of. * @priv: The private data to attach to the pad. * * Set the given private data gpointer on the pad. * This function can only be used by the element that owns the pad. */ void gst_pad_set_element_private (GstPad *pad, gpointer priv) { pad->element_private = priv; } /** * gst_pad_get_element_private: * @pad: the #GstPad to get the private data of. * * Gets the private data of a pad. * * Returns: a #gpointer to the private data. */ gpointer gst_pad_get_element_private (GstPad *pad) { return pad->element_private; } /***** ghost pads *****/ GType _gst_ghost_pad_type = 0; static void gst_ghost_pad_class_init (GstGhostPadClass *klass); static void gst_ghost_pad_init (GstGhostPad *pad); static void gst_ghost_pad_dispose (GObject *object); static GstPad *ghost_pad_parent_class = NULL; /* static guint gst_ghost_pad_signals[LAST_SIGNAL] = { 0 }; */ GType gst_ghost_pad_get_type (void) { if (!_gst_ghost_pad_type) { static const GTypeInfo pad_info = { sizeof (GstGhostPadClass), NULL, NULL, (GClassInitFunc) gst_ghost_pad_class_init, NULL, NULL, sizeof (GstGhostPad), 8, (GInstanceInitFunc) gst_ghost_pad_init, NULL }; _gst_ghost_pad_type = g_type_register_static (GST_TYPE_PAD, "GstGhostPad", &pad_info, 0); } return _gst_ghost_pad_type; } static void gst_ghost_pad_class_init (GstGhostPadClass *klass) { GObjectClass *gobject_class; gobject_class = (GObjectClass*) klass; ghost_pad_parent_class = g_type_class_ref (GST_TYPE_PAD); gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_ghost_pad_dispose); } static void gst_ghost_pad_init (GstGhostPad *pad) { /* zeroed by glib */ } static void gst_ghost_pad_dispose (GObject *object) { GstGhostPad *pad = GST_GHOST_PAD (object); if (pad->realpad) gst_pad_remove_ghost_pad((GstPad *) pad->realpad, (GstPad *) pad); G_OBJECT_CLASS (ghost_pad_parent_class)->dispose (object); } /** * gst_ghost_pad_new: * @name: the name of the new ghost pad. * @pad: the #GstPad to create a ghost pad for. * * Creates a new ghost pad associated with the given pad, and names it with * the given name. If name is NULL, a guaranteed unique name (across all * ghost pads) will be assigned (most likely of the form ghostpad%d). * * Returns: a new ghost #GstPad, or NULL in case of an error. */ GstPad* gst_ghost_pad_new (const gchar *name, GstPad *pad) { GstGhostPad *ghostpad; GstRealPad *realpad; g_return_val_if_fail (GST_IS_PAD (pad), NULL); ghostpad = g_object_new (gst_ghost_pad_get_type () ,NULL); gst_pad_set_name (GST_PAD (ghostpad), name); realpad = (GstRealPad *) pad; while (!GST_IS_REAL_PAD (realpad)) { realpad = GST_PAD_REALIZE (realpad); } GST_GPAD_REALPAD (ghostpad) = realpad; gst_pad_set_pad_template (GST_PAD (ghostpad), GST_PAD_PAD_TEMPLATE (pad)); /* add ourselves to the real pad's list of ghostpads */ gst_pad_add_ghost_pad (pad, GST_PAD (ghostpad)); /* FIXME need to ref the real pad here... ? */ GST_CAT_DEBUG (GST_CAT_PADS, "created ghost pad \"%s\"", gst_pad_get_name (GST_PAD (ghostpad))); return GST_PAD (ghostpad); } /** * gst_pad_get_internal_links_default: * @pad: the #GstPad to get the internal links of. * * Gets a list of pads to which the given pad is linked to * inside of the parent element. * This is the default handler, and thus returns a list of all of the * pads inside the parent element with opposite direction. * The caller must free this list after use. * * Returns: a newly allocated #GList of pads. */ GList* gst_pad_get_internal_links_default (GstPad *pad) { GList *res = NULL; GstElement *parent; GList *parent_pads; GstPadDirection direction; GstRealPad *rpad; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); rpad = GST_PAD_REALIZE (pad); direction = rpad->direction; parent = GST_PAD_PARENT (rpad); parent_pads = parent->pads; while (parent_pads) { GstRealPad *parent_pad = GST_PAD_REALIZE (parent_pads->data); if (parent_pad->direction != direction) { res = g_list_prepend (res, parent_pad); } parent_pads = g_list_next (parent_pads); } return res; } /** * gst_pad_get_internal_links: * @pad: the #GstPad to get the internal links of. * * Gets a list of pads to which the given pad is linked to * inside of the parent element. * The caller must free this list after use. * * Returns: a newly allocated #GList of pads. */ GList* gst_pad_get_internal_links (GstPad *pad) { GList *res = NULL; GstRealPad *rpad; g_return_val_if_fail (GST_IS_PAD (pad), NULL); rpad = GST_PAD_REALIZE (pad); if (GST_RPAD_INTLINKFUNC (rpad)) res = GST_RPAD_INTLINKFUNC (rpad) (GST_PAD (rpad)); return res; } static gboolean gst_pad_event_default_dispatch (GstPad *pad, GstElement *element, GstEvent *event) { GList *orig, *pads; orig = pads = gst_pad_get_internal_links (pad); while (pads) { GstPad *eventpad = GST_PAD (pads->data); pads = g_list_next (pads); /* for all pads in the opposite direction that are linked */ if (GST_PAD_IS_LINKED (eventpad)) { if (GST_PAD_DIRECTION (eventpad) == GST_PAD_SRC) { /* increase the refcount */ gst_event_ref (event); gst_pad_push (eventpad, GST_DATA (event)); } else { GstPad *peerpad = GST_PAD (GST_RPAD_PEER (eventpad)); /* we only send the event on one pad, multi-sinkpad elements * should implement a handler */ g_list_free (orig); return gst_pad_send_event (peerpad, event); } } } gst_event_unref (event); g_list_free (orig); return (GST_PAD_DIRECTION (pad) == GST_PAD_SINK); } /** * gst_pad_event_default: * @pad: a #GstPad to call the default event handler on. * @event: the #GstEvent to handle. * * Invokes the default event handler for the given pad. * * Returns: TRUE if the event was sent succesfully. */ gboolean gst_pad_event_default (GstPad *pad, GstEvent *event) { GstElement *element; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); g_return_val_if_fail (event, FALSE); element = GST_PAD_PARENT (pad); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_EOS: gst_pad_event_default_dispatch (pad, element, event); gst_element_set_eos (element); break; case GST_EVENT_DISCONTINUOUS: { guint64 time; if (gst_event_discont_get_value (event, GST_FORMAT_TIME, &time)) { if (gst_element_requires_clock (element) && element->clock) { gst_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 (int_peer), data); if (res) break; } int_pads = g_list_next (int_pads); } g_list_free (orig); return res; } /** * gst_pad_send_event: * @pad: a #GstPad to send the event to. * @event: the #GstEvent to send to the pad. * * Sends the event to the pad. * * Returns: TRUE if the event was handled. */ gboolean gst_pad_send_event (GstPad *pad, GstEvent *event) { gboolean success = FALSE; GstRealPad *rpad; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); g_return_val_if_fail (event, FALSE); rpad = GST_PAD_REALIZE (pad); if (GST_EVENT_SRC (event) == NULL) GST_EVENT_SRC (event) = gst_object_ref (GST_OBJECT (rpad)); GST_CAT_DEBUG (GST_CAT_EVENT, "have event %d on pad %s:%s", GST_EVENT_TYPE (event), GST_DEBUG_PAD_NAME (rpad)); if (GST_RPAD_EVENTHANDLER (rpad)) success = GST_RPAD_EVENTHANDLER (rpad) (GST_PAD (rpad), event); else { g_warning ("pad %s:%s has no event handler", GST_DEBUG_PAD_NAME (rpad)); gst_event_unref (event); } return success; } typedef struct { GstFormat src_format; gint64 src_value; GstFormat *dest_format; gint64 *dest_value; } GstPadConvertData; static gboolean gst_pad_convert_dispatcher (GstPad *pad, GstPadConvertData *data) { return gst_pad_convert (pad, data->src_format, data->src_value, data->dest_format, data->dest_value); } /** * gst_pad_convert_default: * @pad: a #GstPad to invoke the default converter on. * @src_format: the source #GstFormat. * @src_value: the source value. * @dest_format: a pointer to the destination #GstFormat. * @dest_value: a pointer to the destination value. * * Invokes the default converter on a pad. * This will forward the call to the pad obtained * using the internal link of * the element. * * Returns: TRUE if the conversion could be performed. */ gboolean gst_pad_convert_default (GstPad *pad, GstFormat src_format, gint64 src_value, GstFormat *dest_format, gint64 *dest_value) { GstPadConvertData data; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); g_return_val_if_fail (dest_format, FALSE); g_return_val_if_fail (dest_value, FALSE); data.src_format = src_format; data.src_value = src_value; data.dest_format = dest_format; data.dest_value = dest_value; return gst_pad_dispatcher (pad, (GstPadDispatcherFunction) gst_pad_convert_dispatcher, &data); } /** * gst_pad_convert: * @pad: a #GstPad to invoke the default converter on. * @src_format: the source #GstFormat. * @src_value: the source value. * @dest_format: a pointer to the destination #GstFormat. * @dest_value: a pointer to the destination value. * * Invokes a conversion on the pad. * * Returns: TRUE if the conversion could be performed. */ gboolean gst_pad_convert (GstPad *pad, GstFormat src_format, gint64 src_value, GstFormat *dest_format, gint64 *dest_value) { GstRealPad *rpad; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); g_return_val_if_fail (dest_format, FALSE); g_return_val_if_fail (dest_value, FALSE); if (src_format == *dest_format) { *dest_value = src_value; return TRUE; } rpad = GST_PAD_REALIZE (pad); if (GST_RPAD_CONVERTFUNC (rpad)) { return GST_RPAD_CONVERTFUNC (rpad) (GST_PAD (rpad), src_format, src_value, dest_format, dest_value); } return FALSE; } typedef struct { GstQueryType type; GstFormat *format; gint64 *value; } GstPadQueryData; static gboolean gst_pad_query_dispatcher (GstPad *pad, GstPadQueryData *data) { return gst_pad_query (pad, data->type, data->format, data->value); } /** * gst_pad_query_default: * @pad: a #GstPad to invoke the default query on. * @type: the #GstQueryType of the query to perform. * @format: a pointer to the #GstFormat of the result. * @value: a pointer to the result. * * Invokes the default query function on a pad. * * Returns: TRUE if the query could be performed. */ gboolean gst_pad_query_default (GstPad *pad, GstQueryType type, GstFormat *format, gint64 *value) { GstPadQueryData data; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); g_return_val_if_fail (format, FALSE); g_return_val_if_fail (value, FALSE); data.type = type; data.format = format; data.value = value; return gst_pad_dispatcher (pad, (GstPadDispatcherFunction) gst_pad_query_dispatcher, &data); } /** * gst_pad_query: * @pad: a #GstPad to invoke the default query on. * @type: the #GstQueryType of the query to perform. * @format: a pointer to the #GstFormat asked for. * On return contains the #GstFormat used. * @value: a pointer to the result. * * Queries a pad for one of the available properties. The format will be * adjusted to the actual format used when specifying formats such as * GST_FORMAT_DEFAULT. * FIXME: Tell if the format can be adjusted when specifying a definite format. * * Returns: TRUE if the query could be performed. */ gboolean gst_pad_query (GstPad *pad, GstQueryType type, GstFormat *format, gint64 *value) { GstRealPad *rpad; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); g_return_val_if_fail (format, FALSE); g_return_val_if_fail (value, FALSE); rpad = GST_PAD_REALIZE (pad); g_return_val_if_fail (rpad, FALSE); if (GST_RPAD_QUERYFUNC (rpad)) return GST_RPAD_QUERYFUNC (rpad) (GST_PAD (pad), type, format, value); return FALSE; } static gboolean gst_pad_get_formats_dispatcher (GstPad *pad, const GstFormat **data) { *data = gst_pad_get_formats (pad); return TRUE; } /** * gst_pad_get_formats_default: * @pad: a #GstPad to query * * Invoke the default format dispatcher for the pad. * * Returns: An array of GstFormats ended with a 0 value. */ const GstFormat* gst_pad_get_formats_default (GstPad *pad) { GstFormat *result = NULL; gst_pad_dispatcher (pad, (GstPadDispatcherFunction) gst_pad_get_formats_dispatcher, &result); return result; } /** * gst_pad_get_formats: * @pad: a #GstPad to query * * Gets the list of supported formats from the pad. * * Returns: An array of GstFormats ended with a 0 value. */ const GstFormat* gst_pad_get_formats (GstPad *pad) { GstRealPad *rpad; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); rpad = GST_PAD_REALIZE (pad); if (GST_RPAD_FORMATSFUNC (rpad)) return GST_RPAD_FORMATSFUNC (rpad) (GST_PAD (pad)); return NULL; }