/* GStreamer * Copyright (C) 1999,2000 Erik Walthinsen * 2000 Wim Taymans * * gstpad.c: Pads for connecting elements together * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /* #define GST_DEBUG_ENABLED */ #include "gst_private.h" #include "gstpad.h" #include "gstutils.h" #include "gstelement.h" #include "gsttype.h" #include "gstbin.h" #include "gstscheduler.h" #include "gstevent.h" GType _gst_pad_type = 0; /***** Start with the base GstPad class *****/ static void gst_pad_class_init (GstPadClass *klass); static void gst_pad_init (GstPad *pad); static gboolean gst_pad_try_reconnect_filtered_func (GstRealPad *srcpad, GstRealPad *sinkpad, GstCaps *caps, gboolean clear); #ifndef GST_DISABLE_LOADSAVE static xmlNodePtr gst_pad_save_thyself (GstObject *object, xmlNodePtr parent); #endif static GstObject *pad_parent_class = NULL; GType gst_pad_get_type(void) { if (!_gst_pad_type) { static const GTypeInfo pad_info = { sizeof(GstPadClass), NULL, NULL, (GClassInitFunc)gst_pad_class_init, NULL, NULL, sizeof(GstPad), 32, (GInstanceInitFunc)gst_pad_init, NULL }; _gst_pad_type = g_type_register_static(GST_TYPE_OBJECT, "GstPad", &pad_info, 0); } return _gst_pad_type; } static void gst_pad_class_init (GstPadClass *klass) { pad_parent_class = g_type_class_ref(GST_TYPE_OBJECT); } static void gst_pad_init (GstPad *pad) { pad->element_private = NULL; pad->padtemplate = NULL; } /***** Then do the Real Pad *****/ /* Pad signals and args */ enum { REAL_SET_ACTIVE, REAL_CAPS_CHANGED, REAL_CAPS_NEGO_FAILED, REAL_CONNECTED, REAL_DISCONNECTED, REAL_EVENT_RECEIVED, /* FILL ME */ REAL_LAST_SIGNAL }; enum { REAL_ARG_0, REAL_ARG_ACTIVE, /* FILL ME */ }; static void gst_real_pad_class_init (GstRealPadClass *klass); static void gst_real_pad_init (GstRealPad *pad); static void gst_real_pad_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec); static void gst_real_pad_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec); static void gst_real_pad_dispose (GObject *object); static void gst_pad_push_func (GstPad *pad, GstBuffer *buf); GType _gst_real_pad_type = 0; static GstPad *real_pad_parent_class = NULL; static guint gst_real_pad_signals[REAL_LAST_SIGNAL] = { 0 }; GType gst_real_pad_get_type(void) { if (!_gst_real_pad_type) { static const GTypeInfo pad_info = { sizeof(GstRealPadClass), NULL, NULL, (GClassInitFunc)gst_real_pad_class_init, NULL, NULL, sizeof(GstRealPad), 32, (GInstanceInitFunc)gst_real_pad_init, NULL }; _gst_real_pad_type = g_type_register_static(GST_TYPE_PAD, "GstRealPad", &pad_info, 0); } return _gst_real_pad_type; } static void gst_real_pad_class_init (GstRealPadClass *klass) { GObjectClass *gobject_class; GstObjectClass *gstobject_class; gobject_class = (GObjectClass*) klass; gstobject_class = (GstObjectClass*) klass; real_pad_parent_class = g_type_class_ref (GST_TYPE_PAD); gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_real_pad_dispose); gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_real_pad_set_property); gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_real_pad_get_property); gst_real_pad_signals[REAL_SET_ACTIVE] = g_signal_new ("set_active", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRealPadClass, set_active), NULL, NULL, gst_marshal_VOID__BOOLEAN, G_TYPE_NONE, 1, G_TYPE_BOOLEAN); gst_real_pad_signals[REAL_CAPS_CHANGED] = g_signal_new ("caps_changed", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRealPadClass, caps_changed), NULL, NULL, gst_marshal_VOID__POINTER, G_TYPE_NONE, 1, G_TYPE_POINTER); gst_real_pad_signals[REAL_CAPS_NEGO_FAILED] = g_signal_new ("caps_nego_failed", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRealPadClass, caps_nego_failed), NULL, NULL, gst_marshal_VOID__POINTER, G_TYPE_NONE, 1, G_TYPE_POINTER); gst_real_pad_signals[REAL_CONNECTED] = g_signal_new ("connected", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRealPadClass, connected), NULL, NULL, gst_marshal_VOID__POINTER, G_TYPE_NONE, 1, G_TYPE_POINTER); gst_real_pad_signals[REAL_DISCONNECTED] = g_signal_new ("disconnected", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRealPadClass, disconnected), NULL, NULL, gst_marshal_VOID__POINTER, G_TYPE_NONE, 1, G_TYPE_POINTER); gst_real_pad_signals[REAL_EVENT_RECEIVED] = g_signal_new ("event_received", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRealPadClass, event_received), NULL, NULL, gst_marshal_VOID__POINTER, G_TYPE_NONE, 1, G_TYPE_POINTER); /* gtk_object_add_arg_type ("GstRealPad::active", G_TYPE_BOOLEAN, */ /* GTK_ARG_READWRITE, REAL_ARG_ACTIVE); */ g_object_class_install_property (G_OBJECT_CLASS (klass), REAL_ARG_ACTIVE, g_param_spec_boolean ("active", "Active", "Whether the pad is active.", TRUE,G_PARAM_READWRITE)); #ifndef GST_DISABLE_LOADSAVE gstobject_class->save_thyself = GST_DEBUG_FUNCPTR (gst_pad_save_thyself); #endif gstobject_class->path_string_separator = "."; } static void gst_real_pad_init (GstRealPad *pad) { pad->direction = GST_PAD_UNKNOWN; pad->peer = NULL; pad->sched = NULL; pad->sched_private = NULL; pad->chainfunc = NULL; pad->getfunc = NULL; pad->getregionfunc = NULL; pad->chainhandler = GST_DEBUG_FUNCPTR (gst_pad_push_func); pad->gethandler = NULL; pad->pullregionfunc = NULL; pad->bufferpoolfunc = NULL; pad->ghostpads = NULL; pad->caps = NULL; pad->connectfunc = NULL; pad->getcapsfunc = NULL; } static void gst_real_pad_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { g_return_if_fail (GST_IS_PAD (object)); switch (prop_id) { case REAL_ARG_ACTIVE: if (g_value_get_boolean (value)) { GST_DEBUG (GST_CAT_PADS, "activating pad %s:%s", GST_DEBUG_PAD_NAME (object)); GST_FLAG_UNSET (object, GST_PAD_DISABLED); } else { GST_DEBUG (GST_CAT_PADS, "de-activating pad %s:%s", GST_DEBUG_PAD_NAME (object)); GST_FLAG_SET (object, GST_PAD_DISABLED); } g_signal_emit (G_OBJECT (object), gst_real_pad_signals[REAL_SET_ACTIVE], 0, !GST_FLAG_IS_SET (object, GST_PAD_DISABLED)); break; default: break; } } static void gst_real_pad_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { /* it's not null if we got it, but it might not be ours */ g_return_if_fail (GST_IS_PAD (object)); switch (prop_id) { case REAL_ARG_ACTIVE: g_value_set_boolean (value, !GST_FLAG_IS_SET (object, GST_PAD_DISABLED)); break; default: break; } } /** * gst_pad_new: * @name: name of new pad * @direction: either GST_PAD_SRC or GST_PAD_SINK * * Create a new pad with given name. * * Returns: new pad */ GstPad* gst_pad_new (gchar *name, GstPadDirection direction) { GstRealPad *pad; g_return_val_if_fail (name != NULL, NULL); g_return_val_if_fail (direction != GST_PAD_UNKNOWN, NULL); pad = g_object_new (gst_real_pad_get_type (), NULL); gst_object_set_name (GST_OBJECT (pad), name); GST_RPAD_DIRECTION (pad) = direction; return GST_PAD (pad); } /** * gst_pad_new_from_template: * @templ: the pad template to use * @name: the name of the element * * Create a new pad with given name from the given template. * * Returns: new pad */ GstPad* gst_pad_new_from_template (GstPadTemplate *templ, gchar *name) { GstPad *pad; g_return_val_if_fail (name != NULL, NULL); g_return_val_if_fail (templ != NULL, NULL); pad = gst_pad_new (name, templ->direction); gst_object_ref (GST_OBJECT (templ)); GST_PAD_PAD_TEMPLATE (pad) = templ; return pad; } /** * gst_pad_get_direction: * @pad: the Pad to get the direction from * * Get the direction of the pad. * * Returns: the direction of the pad */ GstPadDirection gst_pad_get_direction (GstPad *pad) { g_return_val_if_fail (pad != NULL, GST_PAD_UNKNOWN); g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_UNKNOWN); return GST_PAD_DIRECTION (pad); } /** * gst_pad_set_name: * @pad: the pad to set the name of * @name: the name of the pad * * Set the name of a pad. */ void gst_pad_set_name (GstPad *pad, const gchar *name) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_PAD (pad)); gst_object_set_name (GST_OBJECT (pad), name); } /** * gst_pad_get_name: * @pad: the pad to get the name of * * Get the name of a pad. * * Returns: the name of the pad, don't free. */ const gchar* gst_pad_get_name (GstPad *pad) { g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); return GST_OBJECT_NAME (pad); } /** * gst_pad_set_chain_function: * @pad: the pad to set the chain function for * @chain: the chain function * * Set the given chain function for the pad. */ void gst_pad_set_chain_function (GstPad *pad, GstPadChainFunction chain) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_CHAINFUNC(pad) = chain; GST_DEBUG (GST_CAT_PADS, "chainfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (chain)); } /** * gst_pad_set_get_function: * @pad: the pad to set the get function for * @get: the get function * * Set the given get function for the pad. */ void gst_pad_set_get_function (GstPad *pad, GstPadGetFunction get) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_GETFUNC(pad) = get; GST_DEBUG (GST_CAT_PADS, "getfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (get)); } /** * gst_pad_set_event_function: * @pad: the pad to set the event handler for * @event: the event handler * * Set the given event handler for the pad. */ void gst_pad_set_event_function (GstPad *pad, GstPadEventFunction event) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_EVENTFUNC(pad) = event; GST_DEBUG (GST_CAT_PADS, "eventfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (event)); } /** * gst_pad_set_getregion_function: * @pad: the pad to set the getregion function for * @getregion: the getregion function * * Set the given getregion function for the pad. */ void gst_pad_set_getregion_function (GstPad *pad, GstPadGetRegionFunction getregion) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_GETREGIONFUNC(pad) = getregion; GST_DEBUG (GST_CAT_PADS, "getregionfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (getregion)); } /** * gst_pad_set_connect_function: * @pad: the pad to set the connect function for * @connect: the connect function * * Set the given connect function for the pad. It will be called * when the pad is connected or reconnected with caps. */ void gst_pad_set_connect_function (GstPad *pad, GstPadConnectFunction connect) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_CONNECTFUNC (pad) = connect; GST_DEBUG (GST_CAT_PADS, "connectfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (connect)); } /** * gst_pad_set_getcaps_function: * @pad: the pad to set the getcaps function for * @getcaps: the getcaps function * * Set the given getcaps function for the pad. */ void gst_pad_set_getcaps_function (GstPad *pad, GstPadGetCapsFunction getcaps) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_GETCAPSFUNC (pad) = getcaps; GST_DEBUG (GST_CAT_PADS, "getcapsfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (getcaps)); } /** * gst_pad_set_bufferpool_function: * @pad: the pad to set the bufferpool function for * @bufpool: the bufferpool function * * Set the given bufferpool function for the pad. */ void gst_pad_set_bufferpool_function (GstPad *pad, GstPadBufferPoolFunction bufpool) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_BUFFERPOOLFUNC (pad) = bufpool; GST_DEBUG (GST_CAT_PADS, "bufferpoolfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (bufpool)); } static void gst_pad_push_func(GstPad *pad, GstBuffer *buf) { if (GST_RPAD_CHAINFUNC (GST_RPAD_PEER (pad)) != NULL) { GST_DEBUG (GST_CAT_DATAFLOW, "calling chain function %s", GST_DEBUG_FUNCPTR_NAME (GST_RPAD_CHAINFUNC (GST_RPAD_PEER (pad)))); (GST_RPAD_CHAINFUNC (GST_RPAD_PEER (pad))) (pad, buf); } else { GST_DEBUG (GST_CAT_DATAFLOW, "default pad_push handler in place, no chain function"); g_warning ("(internal error) default pad_push in place for pad %s:%s but it has no chain function", GST_DEBUG_PAD_NAME (pad)); } } /** * gst_pad_disconnect: * @srcpad: the source pad to disconnect * @sinkpad: the sink pad to disconnect * * Disconnects the source pad from the sink pad. */ void gst_pad_disconnect (GstPad *srcpad, GstPad *sinkpad) { GstRealPad *realsrc, *realsink; /* generic checks */ g_return_if_fail (srcpad != NULL); g_return_if_fail (GST_IS_PAD (srcpad)); g_return_if_fail (sinkpad != NULL); g_return_if_fail (GST_IS_PAD (sinkpad)); GST_INFO (GST_CAT_ELEMENT_PADS, "disconnecting %s:%s(%p) and %s:%s(%p)", GST_DEBUG_PAD_NAME (srcpad), srcpad, GST_DEBUG_PAD_NAME (sinkpad), sinkpad); /* now we need to deal with the real/ghost stuff */ realsrc = GST_PAD_REALIZE (srcpad); realsink = GST_PAD_REALIZE (sinkpad); g_return_if_fail (GST_RPAD_PEER (realsrc) != NULL); g_return_if_fail (GST_RPAD_PEER (realsink) == realsrc); if ((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SINK) && (GST_RPAD_DIRECTION (realsink) == GST_PAD_SRC)) { GstRealPad *temppad; temppad = realsrc; realsrc = realsink; realsink = temppad; } g_return_if_fail ((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SRC) && (GST_RPAD_DIRECTION (realsink) == GST_PAD_SINK)); /* first clear peers */ GST_RPAD_PEER (realsrc) = NULL; GST_RPAD_PEER (realsink) = NULL; /* reset the filters, both filters are refcounted once */ if (GST_RPAD_FILTER (realsrc)) { gst_caps_unref (GST_RPAD_FILTER (realsrc)); GST_RPAD_FILTER (realsink) = NULL; GST_RPAD_FILTER (realsrc) = NULL; } /* now tell the scheduler */ if (GST_PAD_PARENT (realsrc)->sched) gst_scheduler_pad_disconnect (GST_PAD_PARENT (realsrc)->sched, (GstPad *)realsrc, (GstPad *)realsink); else if (GST_PAD_PARENT (realsink)->sched) gst_scheduler_pad_disconnect (GST_PAD_PARENT (realsink)->sched, (GstPad *)realsrc, (GstPad *)realsink); /* hold a reference, as they can go away in the signal handlers */ gst_object_ref (GST_OBJECT (realsrc)); gst_object_ref (GST_OBJECT (realsink)); /* fire off a signal to each of the pads telling them that they've been disconnected */ g_signal_emit (G_OBJECT (realsrc), gst_real_pad_signals[REAL_DISCONNECTED], 0, realsink); g_signal_emit (G_OBJECT (realsink), gst_real_pad_signals[REAL_DISCONNECTED], 0, realsrc); GST_INFO (GST_CAT_ELEMENT_PADS, "disconnected %s:%s and %s:%s", GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad)); gst_object_unref (GST_OBJECT (realsrc)); gst_object_unref (GST_OBJECT (realsink)); } /** * gst_pad_can_connect_filtered: * @srcpad: the source pad to connect * @sinkpad: the sink pad to connect * @filtercaps: the filter caps. * * Checks if the source pad and the sink pad can be connected. * The filter indicates the media type that should flow trought this connection. * * Returns: TRUE if the pad can be connected, FALSE otherwise */ gboolean gst_pad_can_connect_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps *filtercaps) { gint num_decoupled = 0; GstRealPad *realsrc, *realsink; /* generic checks */ g_return_val_if_fail (srcpad != NULL, FALSE); g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE); g_return_val_if_fail (sinkpad != NULL, FALSE); g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE); /* now we need to deal with the real/ghost stuff */ realsrc = GST_PAD_REALIZE (srcpad); realsink = GST_PAD_REALIZE (sinkpad); g_return_val_if_fail (GST_RPAD_PEER (realsrc) == NULL, FALSE); g_return_val_if_fail (GST_RPAD_PEER (realsink) == NULL, FALSE); g_return_val_if_fail (GST_PAD_PARENT (realsrc) != NULL, FALSE); g_return_val_if_fail (GST_PAD_PARENT (realsink) != NULL, FALSE); if (realsrc->sched && realsink->sched) { if (GST_FLAG_IS_SET (GST_PAD_PARENT (realsrc), GST_ELEMENT_DECOUPLED)) num_decoupled++; if (GST_FLAG_IS_SET (GST_PAD_PARENT (realsink), GST_ELEMENT_DECOUPLED)) num_decoupled++; if (realsrc->sched != realsink->sched && num_decoupled != 1) { g_warning ("connecting pads with different scheds requires exactly one decoupled element (queue)"); return FALSE; } } /* check if the directions are compatible */ if (!(((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SINK) && (GST_RPAD_DIRECTION (realsink) == GST_PAD_SRC)) || ((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SRC) && (GST_RPAD_DIRECTION (realsink) == GST_PAD_SINK)))) { return FALSE; } return TRUE; } /** * gst_pad_can_connect: * @srcpad: the source pad to connect * @sinkpad: the sink pad to connect * * Checks if the source pad can be connected to the sink pad. * * Returns: TRUE if the pads can be connected, FALSE otherwise */ gboolean gst_pad_can_connect (GstPad *srcpad, GstPad *sinkpad) { return gst_pad_can_connect_filtered (srcpad, sinkpad, NULL); } /** * gst_pad_connect_filtered: * @srcpad: the source pad to connect * @sinkpad: the sink pad to connect * @filtercaps: the filter caps. * * Connects the source pad to the sink pad. The filter indicates the media type * that should flow trought this connection. * * Returns: TRUE if the pad could be connected, FALSE otherwise */ gboolean gst_pad_connect_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps *filtercaps) { GstRealPad *realsrc, *realsink; gint num_decoupled = 0; /* generic checks */ g_return_val_if_fail (srcpad != NULL, FALSE); g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE); g_return_val_if_fail (sinkpad != NULL, FALSE); g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE); GST_INFO (GST_CAT_PADS, "connecting %s:%s and %s:%s", GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad)); /* now we need to deal with the real/ghost stuff */ realsrc = GST_PAD_REALIZE (srcpad); realsink = GST_PAD_REALIZE (sinkpad); if ((GST_PAD (realsrc) != srcpad) || (GST_PAD (realsink) != sinkpad)) { GST_INFO (GST_CAT_PADS, "*actually* connecting %s:%s and %s:%s", GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink)); } g_return_val_if_fail (GST_RPAD_PEER (realsrc) == NULL, FALSE); g_return_val_if_fail (GST_RPAD_PEER (realsink) == NULL, FALSE); g_return_val_if_fail (GST_PAD_PARENT (realsrc) != NULL, FALSE); g_return_val_if_fail (GST_PAD_PARENT (realsink) != NULL, FALSE); if (realsrc->sched && realsink->sched) { if (GST_FLAG_IS_SET (GST_PAD_PARENT (realsrc), GST_ELEMENT_DECOUPLED)) num_decoupled++; if (GST_FLAG_IS_SET (GST_PAD_PARENT (realsink), GST_ELEMENT_DECOUPLED)) num_decoupled++; if (realsrc->sched != realsink->sched && num_decoupled != 1) { g_warning ("connecting pads with different scheds requires exactly one decoupled element (queue)\n"); return FALSE; } } /* check for reversed directions and swap if necessary */ if ((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SINK) && (GST_RPAD_DIRECTION (realsink) == GST_PAD_SRC)) { GstRealPad *temppad; temppad = realsrc; realsrc = realsink; realsink = temppad; } g_return_val_if_fail ((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SRC) && (GST_RPAD_DIRECTION (realsink) == GST_PAD_SINK), FALSE); /* first set peers */ GST_RPAD_PEER (realsrc) = realsink; GST_RPAD_PEER (realsink) = realsrc; /* try to negotiate the pads, we don't need to clear the caps here */ if (!gst_pad_try_reconnect_filtered_func (realsrc, realsink, filtercaps, FALSE)) { GST_DEBUG (GST_CAT_CAPS, "pads cannot connect"); GST_RPAD_PEER (realsrc) = NULL; GST_RPAD_PEER (realsink) = NULL; return FALSE; } /* fire off a signal to each of the pads telling them that they've been connected */ g_signal_emit (G_OBJECT (realsrc), gst_real_pad_signals[REAL_CONNECTED], 0, realsink); g_signal_emit (G_OBJECT (realsink), gst_real_pad_signals[REAL_CONNECTED], 0, realsrc); /* now tell the scheduler(s) */ if (realsrc->sched) gst_scheduler_pad_connect (realsrc->sched, (GstPad *)realsrc, (GstPad *)realsink); else if (realsink->sched) gst_scheduler_pad_connect (realsink->sched, (GstPad *)realsrc, (GstPad *)realsink); GST_INFO (GST_CAT_PADS, "connected %s:%s and %s:%s", GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad)); gst_caps_debug (gst_pad_get_caps (GST_PAD_CAST (realsrc)), "caps of newly connected src pad"); return TRUE; } /** * gst_pad_connect: * @srcpad: the source pad to connect * @sinkpad: the sink pad to connect * * Connects the source pad to the sink pad. * * Returns: TRUE if the pad could be connected, FALSE otherwise */ gboolean gst_pad_connect (GstPad *srcpad, GstPad *sinkpad) { return gst_pad_connect_filtered (srcpad, sinkpad, NULL); } /** * gst_pad_set_parent: * @pad: the pad to set the parent * @parent: the object to set the parent to * * Sets the parent object of a pad. */ void gst_pad_set_parent (GstPad *pad, GstObject *parent) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_PAD (pad)); g_return_if_fail (GST_PAD_PARENT (pad) == NULL); g_return_if_fail (parent != NULL); g_return_if_fail (GST_IS_OBJECT (parent)); g_return_if_fail ((gpointer)pad != (gpointer)parent); gst_object_set_parent (GST_OBJECT (pad), parent); } /** * gst_pad_get_parent: * @pad: the pad to get the parent from * * Get the parent object of this pad. * * Returns: the parent object */ GstElement* gst_pad_get_parent (GstPad *pad) { g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); return GST_PAD_PARENT (pad); } /** * gst_pad_get_pad_template: * @pad: the pad to get the padtemplate from * * Get the padtemplate object of this pad. * * Returns: the padtemplate object */ GstPadTemplate* gst_pad_get_pad_template (GstPad *pad) { g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); return GST_PAD_PAD_TEMPLATE (pad); } /** * gst_pad_set_sched: * @pad: the pad to set the scheduler for * @sched: The scheduler to set * * Set the scheduler for the pad */ void gst_pad_set_sched (GstPad *pad, GstScheduler *sched) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_PAD (pad)); GST_RPAD_SCHED(pad) = sched; } /** * gst_pad_get_sched: * @pad: the pad to get the scheduler from * * Get the scheduler of the pad * * Returns: the scheduler of the pad. */ GstScheduler* gst_pad_get_sched (GstPad *pad) { g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); return GST_RPAD_SCHED(pad); } /** * gst_pad_unset_sched: * @pad: the pad to unset the scheduler for * * Unset the scheduler for the pad */ void gst_pad_unset_sched (GstPad *pad) { g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_PAD (pad)); GST_RPAD_SCHED(pad) = NULL; } /** * gst_pad_get_real_parent: * @pad: the pad to get the parent from * * Get the real parent object of this pad. If the pad * is a ghostpad, the actual owner of the real pad is * returned, as opposed to the gst_pad_get_parent(). * * Returns: the parent object */ GstElement* gst_pad_get_real_parent (GstPad *pad) { g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); return GST_PAD_PARENT (GST_PAD (GST_PAD_REALIZE (pad))); } /** * gst_pad_add_ghost_pad: * @pad: the pad to set the ghost parent * @ghostpad: the ghost pad to add * * Add a ghost pad to a pad. */ void gst_pad_add_ghost_pad (GstPad *pad, GstPad *ghostpad) { GstRealPad *realpad; g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_PAD (pad)); g_return_if_fail (ghostpad != NULL); g_return_if_fail (GST_IS_GHOST_PAD (ghostpad)); realpad = GST_PAD_REALIZE (pad); realpad->ghostpads = g_list_prepend (realpad->ghostpads, ghostpad); } /** * gst_pad_remove_ghost_pad: * @pad: the pad to remove the ghost parent * @ghostpad: the ghost pad to remove from the pad * * Remove a ghost pad from a pad. */ void gst_pad_remove_ghost_pad (GstPad *pad, GstPad *ghostpad) { GstRealPad *realpad; g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_PAD (pad)); g_return_if_fail (ghostpad != NULL); g_return_if_fail (GST_IS_GHOST_PAD (ghostpad)); realpad = GST_PAD_REALIZE (pad); realpad->ghostpads = g_list_remove (realpad->ghostpads, ghostpad); } /** * gst_pad_get_ghost_pad_list: * @pad: the pad to get the ghost parents from * * Get the ghost parents of this pad. * * Returns: a GList of ghost pads */ GList* gst_pad_get_ghost_pad_list (GstPad *pad) { g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); return GST_PAD_REALIZE(pad)->ghostpads; } /* an internal caps negotiation helper function does: * * 1. optinally calls the pad connect function with the provided caps * 2. deal with the result code of the connect function * 3. set fixed caps on the pad. */ static GstPadConnectReturn gst_pad_try_set_caps_func (GstRealPad *pad, GstCaps *caps, gboolean notify) { GstCaps *oldcaps; GstPadTemplate *template; GstElement *parent = GST_PAD_PARENT (pad); /* thomas: FIXME: is this the right result to return ? */ g_return_val_if_fail (pad != NULL, GST_PAD_CONNECT_REFUSED); g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_CONNECT_REFUSED); /* if this pad has a parent and the parent is not READY, delay the * negotiation */ if (parent && GST_STATE (parent) < GST_STATE_READY) { GST_DEBUG (GST_CAT_CAPS, "parent %s of pad %s:%s is not ready", GST_ELEMENT_NAME (parent), GST_DEBUG_PAD_NAME (pad)); return GST_PAD_CONNECT_DELAYED; } GST_INFO (GST_CAT_CAPS, "trying to set caps %p on pad %s:%s", caps, GST_DEBUG_PAD_NAME (pad)); if ((template = gst_pad_get_pad_template (GST_PAD_CAST (pad)))) { if (!gst_caps_intersect (caps, gst_pad_template_get_caps (template))) { GST_INFO (GST_CAT_CAPS, "caps did not intersect with %s:%s's padtemplate", GST_DEBUG_PAD_NAME (pad)); gst_caps_debug (caps, "caps themselves (attemped to set)"); gst_caps_debug (gst_pad_template_get_caps (template), "pad template caps that did not agree with caps"); return GST_PAD_CONNECT_REFUSED; } /* given that the caps are fixed, we know that their intersection with the * padtemplate caps is the same as caps itself */ } /* we need to notify the connect function */ if (notify && GST_RPAD_CONNECTFUNC (pad)) { GstPadConnectReturn res; gchar *debug_string; GST_INFO (GST_CAT_CAPS, "calling connect function on pad %s:%s", GST_DEBUG_PAD_NAME (pad)); /* call the connect function */ res = GST_RPAD_CONNECTFUNC (pad) (GST_PAD (pad), caps); switch (res) { case GST_PAD_CONNECT_REFUSED: debug_string = "REFUSED"; break; case GST_PAD_CONNECT_OK: debug_string = "OK"; break; case GST_PAD_CONNECT_DONE: debug_string = "DONE"; break; case GST_PAD_CONNECT_DELAYED: debug_string = "DELAYED"; break; default: g_warning ("unknown return code from connect function of pad %s:%s %d", GST_DEBUG_PAD_NAME (pad), res); return GST_PAD_CONNECT_REFUSED; } GST_INFO (GST_CAT_CAPS, "got reply %s (%d) from connect function on pad %s:%s", debug_string, res, GST_DEBUG_PAD_NAME (pad)); /* done means the connect function called another caps negotiate function * on this pad that succeeded, we dont need to continue */ if (res == GST_PAD_CONNECT_DONE) { GST_INFO (GST_CAT_CAPS, "pad %s:%s is done", GST_DEBUG_PAD_NAME (pad)); return GST_PAD_CONNECT_DONE; } if (res == GST_PAD_CONNECT_REFUSED) { GST_INFO (GST_CAT_CAPS, "pad %s:%s doesn't accept caps", GST_DEBUG_PAD_NAME (pad)); return GST_PAD_CONNECT_REFUSED; } } /* we can only set caps on the pad if they are fixed */ if (GST_CAPS_IS_FIXED (caps)) { GST_INFO (GST_CAT_CAPS, "setting caps on pad %s:%s", GST_DEBUG_PAD_NAME (pad)); /* if we got this far all is ok, remove the old caps, set the new one */ oldcaps = GST_PAD_CAPS (pad); if (caps) gst_caps_ref (caps); GST_PAD_CAPS (pad) = caps; if (oldcaps) gst_caps_unref (oldcaps); } else { GST_INFO (GST_CAT_CAPS, "caps are not fixed on pad %s:%s, not setting them yet", GST_DEBUG_PAD_NAME (pad)); } return GST_PAD_CONNECT_OK; } /** * gst_pad_try_set_caps: * @pad: the pad to try to set the caps on * @caps: the caps to set * * Try to set the caps on the given pad. * * Returns: TRUE if the caps could be set */ gboolean gst_pad_try_set_caps (GstPad *pad, GstCaps *caps) { GstRealPad *peer, *realpad; realpad = GST_PAD_REALIZE (pad); peer = GST_RPAD_PEER (realpad); GST_INFO (GST_CAT_CAPS, "trying to set caps %p on pad %s:%s", caps, GST_DEBUG_PAD_NAME (realpad)); gst_caps_debug (caps, "caps that we are trying to set"); /* setting non fixed caps on a pad is not allowed */ if (!GST_CAPS_IS_FIXED (caps)) { GST_INFO (GST_CAT_CAPS, "trying to set unfixed caps on pad %s:%s, not allowed", GST_DEBUG_PAD_NAME (realpad)); g_warning ("trying to set non fixed caps on pad %s:%s, not allowed", GST_DEBUG_PAD_NAME (realpad)); gst_caps_debug (caps, "unfixed caps"); return FALSE; } /* if we have a peer try to set the caps, notifying the peerpad * if it has a connect function */ if (peer && (gst_pad_try_set_caps_func (peer, caps, TRUE) != GST_PAD_CONNECT_OK)) { GST_INFO (GST_CAT_CAPS, "tried to set caps on peerpad %s:%s but couldn't", GST_DEBUG_PAD_NAME (peer)); return FALSE; } /* then try to set our own caps, we don't need to be notified */ if (gst_pad_try_set_caps_func (realpad, caps, FALSE) != GST_PAD_CONNECT_OK) { GST_INFO (GST_CAT_CAPS, "tried to set own caps on pad %s:%s but couldn't", GST_DEBUG_PAD_NAME (realpad)); return FALSE; } GST_INFO (GST_CAT_CAPS, "succeeded setting caps %p on pad %s:%s", caps, GST_DEBUG_PAD_NAME (realpad)); g_assert (GST_PAD_CAPS (pad)); return TRUE; } /* this is a caps negotiation convenience routine, it performs: * * 1. optionally clear any pad caps * 2. calculate the intersection between the two pad tamplate/getcaps caps * 3. calculate the intersection with the (optional) filtercaps. * 4. store the intersection in the pad filter * 5. store the app filtercaps in the pad appfilter. * 6. start the caps negotiation. */ static gboolean gst_pad_try_reconnect_filtered_func (GstRealPad *srcpad, GstRealPad *sinkpad, GstCaps *filtercaps, gboolean clear) { GstCaps *srccaps, *sinkcaps; GstCaps *intersection = NULL; GstRealPad *realsrc, *realsink; realsrc = GST_PAD_REALIZE (srcpad); realsink = GST_PAD_REALIZE (sinkpad); g_return_val_if_fail (GST_RPAD_PEER (realsrc) != NULL, FALSE); g_return_val_if_fail (GST_RPAD_PEER (realsink) == realsrc, FALSE); /* optinally clear the caps */ if (clear) { GST_INFO (GST_CAT_PADS, "reconnect filtered %s:%s and %s:%s, clearing caps", GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink)); GST_PAD_CAPS (GST_PAD (realsrc)) = NULL; GST_PAD_CAPS (GST_PAD (realsink)) = NULL; } else { GST_INFO (GST_CAT_PADS, "reconnect filtered %s:%s and %s:%s", GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink)); } srccaps = gst_pad_get_caps (GST_PAD (realsrc)); GST_INFO (GST_CAT_PADS, "dumping caps of pad %s:%s", GST_DEBUG_PAD_NAME (realsrc)); gst_caps_debug (srccaps, "caps of src pad (pre-reconnect)"); sinkcaps = gst_pad_get_caps (GST_PAD (realsink)); GST_INFO (GST_CAT_PADS, "dumping caps of pad %s:%s", GST_DEBUG_PAD_NAME (realsink)); gst_caps_debug (sinkcaps, "caps of sink pad (pre-reconnect)"); /* first take the intersection of the pad caps */ intersection = gst_caps_intersect (srccaps, sinkcaps); /* if we have no intersection but one of the caps was not NULL.. */ if (!intersection && (srccaps || sinkcaps)) { /* the intersection is NULL but the pad caps were not both NULL, * this means they have no common format */ GST_INFO (GST_CAT_PADS, "pads %s:%s and %s:%s have no common type", GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink)); return FALSE; } else if (intersection) { GST_INFO (GST_CAT_PADS, "pads %s:%s and %s:%s intersected to %s caps", GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink), ((intersection && GST_CAPS_IS_FIXED (intersection)) ? "fixed" : "variable")); /* then filter this against the app filter */ if (filtercaps) { GstCaps *filtered_intersection = gst_caps_intersect (intersection, filtercaps); /* get rid of the old intersection here */ gst_caps_unref (intersection); if (!filtered_intersection) { GST_INFO (GST_CAT_PADS, "filtered connection between pads %s:%s and %s:%s is empty", GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink)); return FALSE; } intersection = filtered_intersection; /* keep a reference to the app caps */ GST_RPAD_APPFILTER (realsink) = filtercaps; GST_RPAD_APPFILTER (realsrc) = filtercaps; } } GST_DEBUG (GST_CAT_CAPS, "setting filter for connection to:"); gst_caps_debug (intersection, "filter for connection"); /* both the app filter and the filter, while stored on both peer pads, are the equal to the same thing on both */ GST_RPAD_FILTER (realsrc) = intersection; GST_RPAD_FILTER (realsink) = intersection; return gst_pad_perform_negotiate (GST_PAD (realsrc), GST_PAD (realsink)); } /** * gst_pad_perform_negotiate: * @srcpad: a srcpad * @sinkpad: a sinkpad * * Try to negotiate the pads. * * Returns: a boolean indicating the pad succesfully negotiated. */ gboolean gst_pad_perform_negotiate (GstPad *srcpad, GstPad *sinkpad) { GstCaps *intersection, *filtered_intersection; GstRealPad *realsrc, *realsink; GstCaps *srccaps, *sinkcaps, *filter; g_return_val_if_fail (srcpad != NULL, FALSE); g_return_val_if_fail (sinkpad != NULL, FALSE); realsrc = GST_PAD_REALIZE (srcpad); realsink = GST_PAD_REALIZE (sinkpad); g_return_val_if_fail (GST_RPAD_PEER (realsrc) != NULL, FALSE); g_return_val_if_fail (GST_RPAD_PEER (realsink) == realsrc, FALSE); filter = GST_RPAD_APPFILTER (realsrc); if (filter) { GST_INFO (GST_CAT_PADS, "dumping filter for connection %s:%s-%s:%s", GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink)); gst_caps_debug (filter, "connection filter caps"); } /* calculate the new caps here */ srccaps = gst_pad_get_caps (GST_PAD (realsrc)); GST_INFO (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_INFO (GST_CAT_PADS, "dumping caps of pad %s:%s", GST_DEBUG_PAD_NAME (realsink)); gst_caps_debug (sinkcaps, "sink caps, awaiting negotiation, after applying filter"); intersection = gst_caps_intersect (srccaps, sinkcaps); filtered_intersection = gst_caps_intersect (intersection, filter); if (filtered_intersection) { gst_caps_unref (intersection); intersection = filtered_intersection; } /* no negotiation is performed if the pads have filtercaps */ if (intersection) { GstPadConnectReturn res; res = gst_pad_try_set_caps_func (realsrc, intersection, TRUE); if (res == GST_PAD_CONNECT_REFUSED) return FALSE; if (res == GST_PAD_CONNECT_DONE) return TRUE; res = gst_pad_try_set_caps_func (realsink, intersection, TRUE); if (res == GST_PAD_CONNECT_REFUSED) return FALSE; if (res == GST_PAD_CONNECT_DONE) return TRUE; } return TRUE; } /** * gst_pad_try_reconnect_filtered: * @srcpad: the source"pad to reconnect * @sinkpad: the sink pad to reconnect * @filtercaps: the capabilities to use in the reconnectiong * * Try to reconnect this pad and its peer with the specified caps * * Returns: a boolean indicating the peer pad could accept the caps. */ gboolean gst_pad_try_reconnect_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps *filtercaps) { GstRealPad *realsrc, *realsink; g_return_val_if_fail (srcpad != NULL, FALSE); g_return_val_if_fail (sinkpad != NULL, FALSE); realsrc = GST_PAD_REALIZE (srcpad); realsink = GST_PAD_REALIZE (sinkpad); g_return_val_if_fail (GST_RPAD_PEER (realsrc) != NULL, FALSE); g_return_val_if_fail (GST_RPAD_PEER (realsink) == realsrc, FALSE); return gst_pad_try_reconnect_filtered_func (realsrc, realsink, filtercaps, TRUE); } /** * gst_pad_reconnect_filtered: * @srcpad: the source"pad to reconnect * @sinkpad: the sink pad to reconnect * @filtercaps: the capabilities to use in the reconnectiong * * Try to reconnect this pad and its peer with the specified caps. * * Returns: a boolean indicating the peer pad could accept the caps. * if FALSE is returned, the pads are disconnected. */ gboolean gst_pad_reconnect_filtered (GstPad *srcpad, GstPad *sinkpad, GstCaps *filtercaps) { GstRealPad *realsrc, *realsink; g_return_val_if_fail (srcpad != NULL, FALSE); g_return_val_if_fail (sinkpad != NULL, FALSE); realsrc = GST_PAD_REALIZE (srcpad); realsink = GST_PAD_REALIZE (sinkpad); g_return_val_if_fail (GST_RPAD_PEER (realsrc) != NULL, FALSE); g_return_val_if_fail (GST_RPAD_PEER (realsink) == realsrc, FALSE); if (!gst_pad_try_reconnect_filtered_func (realsrc, realsink, filtercaps, TRUE)) { gst_pad_disconnect (srcpad, GST_PAD (GST_PAD_PEER (srcpad))); return FALSE; } return TRUE; } /** * gst_pad_proxy_connect: * @pad: the pad to proxy to * @caps: the capabilities to use in the proxying * * Proxy the connect function to the specified pad. * * Returns: a boolean indicating the peer pad could accept the caps. */ GstPadConnectReturn gst_pad_proxy_connect (GstPad *pad, GstCaps *caps) { GstRealPad *peer, *realpad; realpad = GST_PAD_REALIZE (pad); peer = GST_RPAD_PEER (realpad); GST_INFO (GST_CAT_CAPS, "proxy connect to pad %s:%s", GST_DEBUG_PAD_NAME (realpad)); if (peer && gst_pad_try_set_caps_func (peer, caps, TRUE) < 0) return GST_PAD_CONNECT_REFUSED; if (gst_pad_try_set_caps_func (realpad, caps, FALSE) < 0) return GST_PAD_CONNECT_REFUSED; return GST_PAD_CONNECT_OK; } /** * gst_pad_get_caps: * @pad: the pad to get the capabilities from * * Get the capabilities of this pad. * * Returns: the capabilities of this pad */ GstCaps* gst_pad_get_caps (GstPad *pad) { GstRealPad *realpad; g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); realpad = GST_PAD_REALIZE (pad); GST_DEBUG (GST_CAT_CAPS, "get pad caps of %s:%s (%p)", GST_DEBUG_PAD_NAME (realpad), realpad); if (GST_PAD_CAPS (realpad)) { GST_DEBUG (GST_CAT_CAPS, "using pad real caps"); return GST_PAD_CAPS (realpad); } else if GST_RPAD_GETCAPSFUNC (realpad) { GST_DEBUG (GST_CAT_CAPS, "using pad get function"); return GST_RPAD_GETCAPSFUNC (realpad) (GST_PAD_CAST (realpad), NULL); } else if (GST_PAD_PAD_TEMPLATE (realpad)) { GST_DEBUG (GST_CAT_CAPS, "using pad template"); return GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (realpad)); } GST_DEBUG (GST_CAT_CAPS, "pad has no caps"); return NULL; } /** * gst_pad_get_pad_template_caps: * @pad: the pad to get the capabilities from * * Get the capabilities of this pad. * * Returns: a list of the capabilities of this pad */ GstCaps* gst_pad_get_pad_template_caps (GstPad *pad) { g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); if (GST_PAD_PAD_TEMPLATE (pad)) return GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (pad)); return NULL; } /** * gst_pad_template_get_caps_by_name: * @templ: the padtemplate to get the capabilities from * @name: the name of the capability to get * * Get the capability with the given name from this padtemplate. * * Returns: a capability or NULL if not found */ GstCaps* gst_pad_template_get_caps_by_name (GstPadTemplate *templ, const gchar *name) { GstCaps *caps; g_return_val_if_fail (templ != NULL, NULL); caps = GST_PAD_TEMPLATE_CAPS (templ); if (!caps) return NULL; return gst_caps_get_by_name (caps, name); } /** * gst_pad_check_compatibility: * @srcpad: the srcpad to check * @sinkpad: the sinkpad to check against * * Check if two pads have compatible capabilities. * * Returns: TRUE if they are compatible or the capabilities * could not be checked */ gboolean gst_pad_check_compatibility (GstPad *srcpad, GstPad *sinkpad) { g_return_val_if_fail (srcpad != NULL, FALSE); g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE); g_return_val_if_fail (sinkpad != NULL, FALSE); g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE); if (GST_PAD_CAPS (srcpad) && GST_PAD_CAPS (sinkpad)) { if (!gst_caps_check_compatibility (GST_PAD_CAPS (srcpad), GST_PAD_CAPS (sinkpad))) { return FALSE; } else { return TRUE; } } else { GST_DEBUG (GST_CAT_PADS, "could not check capabilities of pads (%s:%s) and (%s:%s) %p %p", GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad), GST_PAD_CAPS (srcpad), GST_PAD_CAPS (sinkpad)); return TRUE; } } /** * gst_pad_get_peer: * @pad: the pad to get the peer from * * Get the peer pad of this pad. * * Returns: the peer pad */ GstPad* gst_pad_get_peer (GstPad *pad) { g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); return GST_PAD (GST_PAD_PEER (pad)); } /** * gst_pad_get_allowed_caps: * @pad: the pad to get the allowed caps from * * Get the caps of the allowed media types that can * go through this pad. * * Returns: the allowed caps, newly allocated */ GstCaps* gst_pad_get_allowed_caps (GstPad *pad) { g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); GST_DEBUG (GST_CAT_PROPERTIES, "get allowed caps of %s:%s", GST_DEBUG_PAD_NAME (pad)); return gst_caps_copy (GST_RPAD_FILTER (pad)); } /** * gst_pad_recalc_allowed_caps: * @pad: the pad to recaculate the caps of * * Attempt to reconnect the pad to its peer through its filter, * set with gst_pad_[re]connect_filtered. This function is useful when a * plugin has new capabilities on a pad and wants to notify the peer. * * Returns: TRUE on success, FALSE otherwise. */ gboolean gst_pad_recalc_allowed_caps (GstPad *pad) { GstRealPad *peer; g_return_val_if_fail (pad != NULL, FALSE); g_return_val_if_fail (GST_IS_PAD (pad), FALSE); GST_DEBUG (GST_CAT_PROPERTIES, "set allowed caps of %s:%s", GST_DEBUG_PAD_NAME (pad)); peer = GST_RPAD_PEER (pad); if (peer) return gst_pad_try_reconnect_filtered (pad, GST_PAD (peer), GST_RPAD_APPFILTER (pad)); return TRUE; } /** * gst_pad_get_bufferpool: * @pad: the pad to get the bufferpool from * * Get the bufferpool of the peer pad of the given * pad. * * Returns: The GstBufferPool or NULL. */ GstBufferPool* gst_pad_get_bufferpool (GstPad *pad) { GstRealPad *peer; g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); peer = GST_RPAD_PEER (pad); if (!peer) return NULL; GST_DEBUG_ENTER ("(%s:%s)", GST_DEBUG_PAD_NAME (pad)); if (peer->bufferpoolfunc) { GST_DEBUG (GST_CAT_PADS, "calling bufferpoolfunc &%s (@%p) of peer pad %s:%s", GST_DEBUG_FUNCPTR_NAME (peer->bufferpoolfunc), &peer->bufferpoolfunc, GST_DEBUG_PAD_NAME (((GstPad*) peer))); return (peer->bufferpoolfunc) (((GstPad*) peer)); } else { GST_DEBUG (GST_CAT_PADS, "no bufferpoolfunc for peer pad %s:%s at %p", GST_DEBUG_PAD_NAME (((GstPad*) peer)), &peer->bufferpoolfunc); return NULL; } } static void gst_real_pad_dispose (GObject *object) { GstPad *pad = GST_PAD (object); /* No connected pad can ever be disposed. * It has to have a parent to be connected and a parent would hold a reference */ g_assert (GST_PAD_PEER (pad) == NULL); GST_DEBUG (GST_CAT_REFCOUNTING, "dispose %s:%s", GST_DEBUG_PAD_NAME(pad)); if (GST_PAD_PAD_TEMPLATE (pad)){ GST_DEBUG (GST_CAT_REFCOUNTING, "unreffing padtemplate'%s'", GST_OBJECT_NAME (GST_PAD_PAD_TEMPLATE (pad))); gst_object_unref (GST_OBJECT (GST_PAD_PAD_TEMPLATE (pad))); GST_PAD_PAD_TEMPLATE (pad) = NULL; } /* we destroy the ghostpads, because they are nothing without the real pad */ if (GST_REAL_PAD (pad)->ghostpads) { GList *orig, *ghostpads; orig = ghostpads = g_list_copy (GST_REAL_PAD (pad)->ghostpads); while (ghostpads) { GstPad *ghostpad = GST_PAD (ghostpads->data); if (GST_IS_ELEMENT (GST_OBJECT_PARENT (ghostpad))){ GST_DEBUG (GST_CAT_REFCOUNTING, "removing ghost pad from element '%s'", GST_OBJECT_NAME (GST_OBJECT_PARENT (ghostpad))); gst_element_remove_ghost_pad (GST_ELEMENT (GST_OBJECT_PARENT (ghostpad)), GST_PAD (ghostpad)); } ghostpads = g_list_next (ghostpads); } g_list_free (orig); g_list_free (GST_REAL_PAD(pad)->ghostpads); } if (GST_IS_ELEMENT (GST_OBJECT_PARENT (pad))){ GST_DEBUG (GST_CAT_REFCOUNTING, "removing pad from element '%s'", GST_OBJECT_NAME (GST_OBJECT (GST_ELEMENT (GST_OBJECT_PARENT (pad))))); gst_element_remove_pad (GST_ELEMENT (GST_OBJECT_PARENT (pad)), pad); } G_OBJECT_CLASS (real_pad_parent_class)->dispose (object); } #ifndef GST_DISABLE_LOADSAVE /** * gst_pad_load_and_connect: * @self: the XML node to read the description from * @parent: the element that has the pad * * Read the pad definition from the XML node and connect the given pad * in element to a pad of an element up in the hierarchy. */ void gst_pad_load_and_connect (xmlNodePtr self, GstObject *parent) { xmlNodePtr field = self->xmlChildrenNode; GstPad *pad = NULL, *targetpad; guchar *peer = NULL; gchar **split; GstElement *target; GstObject *grandparent; while (field) { if (!strcmp (field->name, "name")) { pad = gst_element_get_pad (GST_ELEMENT (parent), xmlNodeGetContent (field)); } else if (!strcmp(field->name, "peer")) { peer = xmlNodeGetContent (field); } field = field->next; } g_return_if_fail (pad != NULL); if (peer == NULL) return; split = g_strsplit (peer, ".", 2); g_return_if_fail (split[0] != NULL); g_return_if_fail (split[1] != NULL); grandparent = gst_object_get_parent (parent); if (grandparent && GST_IS_BIN (grandparent)) { target = gst_bin_get_by_name_recurse_up (GST_BIN (grandparent), split[0]); } else goto cleanup; if (target == NULL) goto cleanup; targetpad = gst_element_get_pad (target, split[1]); if (targetpad == NULL) goto cleanup; gst_pad_connect (pad, targetpad); cleanup: g_strfreev (split); } /** * gst_pad_save_thyself: * @pad: the pad to save * @parent: the parent XML node to save the description in * * Saves the pad into an xml representation * * Returns: the xml representation of the pad */ static xmlNodePtr gst_pad_save_thyself (GstObject *object, xmlNodePtr parent) { GstRealPad *realpad; GstPad *peer; g_return_val_if_fail (GST_IS_REAL_PAD (object), NULL); realpad = GST_REAL_PAD(object); xmlNewChild(parent,NULL,"name", GST_PAD_NAME (realpad)); if (GST_RPAD_PEER(realpad) != NULL) { peer = GST_PAD(GST_RPAD_PEER(realpad)); /* first check to see if the peer's parent's parent is the same */ /* we just save it off */ xmlNewChild(parent,NULL,"peer",g_strdup_printf("%s.%s", GST_OBJECT_NAME (GST_PAD_PARENT (peer)), GST_PAD_NAME (peer))); } else xmlNewChild(parent,NULL,"peer",""); return parent; } /** * gst_pad_ghost_save_thyself: * @pad: the pad to save * @bin: the bin * @parent: the parent XML node to save the description in * * Saves the ghost pad into an xml representation. * * Returns: the xml representation of the pad */ xmlNodePtr gst_pad_ghost_save_thyself (GstPad *pad, GstElement *bin, xmlNodePtr parent) { xmlNodePtr self; g_return_val_if_fail (GST_IS_GHOST_PAD (pad), NULL); self = xmlNewChild (parent, NULL, "ghostpad", NULL); xmlNewChild (self, NULL, "name", GST_PAD_NAME (pad)); xmlNewChild (self, NULL, "parent", GST_OBJECT_NAME (GST_PAD_PARENT (pad))); /* FIXME FIXME FIXME! */ return self; } #endif /* GST_DISABLE_LOADSAVE */ #ifndef gst_pad_push /** * gst_pad_push: * @pad: the pad to push * @buf: the buffer to push * * Push a buffer to the peer of the pad. */ void gst_pad_push (GstPad *pad, GstBuffer *buf) { GstRealPad *peer = GST_RPAD_PEER (pad); GST_DEBUG_ENTER ("(%s:%s)", GST_DEBUG_PAD_NAME (pad)); g_return_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SRC); if (!peer) { g_warning ("push on pad %s:%s but it is unconnected", GST_DEBUG_PAD_NAME (pad)); } else { if (peer->chainhandler) { if (buf) { GST_DEBUG (GST_CAT_DATAFLOW, "calling chainhandler &%s of peer pad %s:%s", GST_DEBUG_FUNCPTR_NAME (peer->chainhandler), GST_DEBUG_PAD_NAME (GST_PAD (peer))); (peer->chainhandler) (GST_PAD_CAST (peer), buf); return; } else { g_warning ("trying to push a NULL buffer on pad %s:%s", GST_DEBUG_PAD_NAME (peer)); return; } } else { g_warning ("(internal error) push on pad %s:%s but it has no chainhandler", GST_DEBUG_PAD_NAME (peer)); } } /* clean up the mess here */ if (buf != NULL) { if (GST_IS_BUFFER (buf)) gst_buffer_unref (buf); else gst_event_free (GST_EVENT (buf)); } } #endif #ifndef gst_pad_pull /** * gst_pad_pull: * @pad: the pad to pull * * Pull a buffer from the peer pad. * * Returns: a new buffer from the peer pad. */ GstBuffer* gst_pad_pull (GstPad *pad) { GstRealPad *peer = GST_RPAD_PEER(pad); GST_DEBUG_ENTER("(%s:%s)",GST_DEBUG_PAD_NAME(pad)); g_return_val_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SINK, NULL); if (!peer) { gst_element_error (GST_PAD_PARENT (pad), "pull on pad %s:%s but it was unconnected", GST_ELEMENT_NAME (GST_PAD_PARENT (pad)), GST_PAD_NAME (pad), NULL); } else { if (peer->gethandler) { GstBuffer *buf; GST_DEBUG (GST_CAT_DATAFLOW, "calling gethandler %s of peer pad %s:%s", GST_DEBUG_FUNCPTR_NAME (peer->gethandler), GST_DEBUG_PAD_NAME (peer)); buf = (peer->gethandler) (GST_PAD_CAST (peer)); if (buf) return buf; /* no null buffers allowed */ gst_element_error (GST_PAD_PARENT (pad), "NULL buffer during pull on %s:%s", GST_DEBUG_PAD_NAME (pad), NULL); } else { gst_element_error (GST_PAD_PARENT (pad), "(internal error) pull on pad %s:%s but the peer pad %s:%s has no gethandler", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_PAD_NAME (peer), NULL); } } return NULL; } #endif #ifndef gst_pad_pullregion /** * gst_pad_pullregion: * @pad: the pad to pull the region from * @type: the regiontype * @offset: the offset/start of the buffer to pull * @len: the length of the buffer to pull * * Pull a buffer region from the peer pad. The region to pull can be * specified with a offset/lenght pair or with a start/legnth time * indicator as specified by the type parameter. * * Returns: a new buffer from the peer pad with data in the specified * region. */ GstBuffer* gst_pad_pullregion (GstPad *pad, GstRegionType type, guint64 offset, guint64 len) { GstRealPad *peer; GstBuffer *result = NULL; g_return_val_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SINK, NULL); do { peer = GST_RPAD_PEER(pad); g_return_val_if_fail (peer != NULL, NULL); if (result) gst_buffer_unref (result); GST_DEBUG_ENTER("(%s:%s,%d,%lld,%lld)",GST_DEBUG_PAD_NAME(pad),type,offset,len); if (peer->pullregionfunc) { GST_DEBUG (GST_CAT_DATAFLOW, "calling pullregionfunc &%s of peer pad %s:%s", GST_DEBUG_FUNCPTR_NAME (peer->pullregionfunc), GST_DEBUG_PAD_NAME(GST_PAD_CAST (peer))); result = (peer->pullregionfunc) (GST_PAD_CAST (peer), type, offset, len); } else { GST_DEBUG (GST_CAT_DATAFLOW,"no pullregionfunc"); result = NULL; break; } } /* FIXME */ while (result && !(GST_BUFFER_OFFSET (result) == offset && GST_BUFFER_SIZE (result) == len)); return result; } #endif /** * gst_pad_peek: * @pad: the pad to peek * * Peek for a buffer from the peer pad. * * Returns: a from the peer pad or NULL if the peer has no buffer. */ GstBuffer* gst_pad_peek (GstPad *pad) { g_return_val_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SINK, NULL); return GST_RPAD_BUFPEN (GST_RPAD_PEER (pad)); } /** * gst_pad_select: * @padlist: A list of pads * * Wait for a buffer on the list of pads. * * Returns: The pad that has a buffer available, use * #gst_pad_pull to get the buffer. */ GstPad* gst_pad_select (GList *padlist) { GstPad *pad; pad = gst_scheduler_pad_select (GST_PAD_PARENT (padlist->data)->sched, padlist); return pad; } /** * gst_pad_selectv: * @pad: The first pad to perform the select on * @...: More pads * * Wait for a buffer on the given of pads. * * Returns: The pad that has a buffer available, use * #gst_pad_pull to get the buffer. */ GstPad* gst_pad_selectv (GstPad *pad, ...) { GstPad *result; GList *padlist = NULL; va_list var_args; if (pad == NULL) return NULL; va_start (var_args, pad); while (pad) { padlist = g_list_prepend (padlist, pad); pad = va_arg (var_args, GstPad *); } result = gst_pad_select (padlist); g_list_free (padlist); va_end (var_args); return result; } /************************************************************************ * * templates * */ static void gst_pad_template_class_init (GstPadTemplateClass *klass); static void gst_pad_template_init (GstPadTemplate *templ); 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_template_get_type (void) { static GType padtemplate_type = 0; if (!padtemplate_type) { static const GTypeInfo padtemplate_info = { sizeof(GstPadTemplateClass), NULL, NULL, (GClassInitFunc)gst_pad_template_class_init, NULL, NULL, sizeof(GstPadTemplate), 32, (GInstanceInitFunc)gst_pad_template_init, NULL }; padtemplate_type = g_type_register_static(GST_TYPE_OBJECT, "GstPadTemplate", &padtemplate_info, 0); } return padtemplate_type; } static void gst_pad_template_class_init (GstPadTemplateClass *klass) { GObjectClass *gobject_class; GstObjectClass *gstobject_class; gobject_class = (GObjectClass*)klass; gstobject_class = (GstObjectClass*)klass; padtemplate_parent_class = g_type_class_ref(GST_TYPE_OBJECT); gst_pad_template_signals[TEMPL_PAD_CREATED] = g_signal_new ("pad_created", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstPadTemplateClass, pad_created), NULL, NULL, gst_marshal_VOID__POINTER, G_TYPE_NONE, 1, G_TYPE_POINTER); gstobject_class->path_string_separator = "*"; } static void gst_pad_template_init (GstPadTemplate *templ) { } /* ALWAYS padtemplates cannot have conversion specifications, it doesn't make * sense. * SOMETIMES padtemplates can do whatever they want, they are provided by the * element. * REQUEST padtemplates can be reverse-parsed (the user asks for 'sink1', the * 'sink%d' template is automatically selected), so we need to restrict their * naming. */ static gboolean name_is_valid (const gchar *name, GstPadPresence presence) { const gchar *str; if (presence == GST_PAD_ALWAYS) { if (strchr (name, '%')) { g_warning ("invalid name template %s: conversion specifications are not" " allowed for GST_PAD_ALWAYS padtemplates", name); return FALSE; } } else if (presence == GST_PAD_REQUEST) { if ((str = strchr (name, '%')) && strchr (str + 1, '%')) { g_warning ("invalid name template %s: only one conversion specification" " allowed in GST_PAD_REQUEST padtemplate", name); return FALSE; } if (str && (*(str+1) != 's' && *(str+1) != 'd')) { g_warning ("invalid name template %s: conversion specification must be of" " type '%%d' or '%%s' for GST_PAD_REQUEST padtemplate", name); return FALSE; } if (str && (*(str+2) != '\0')) { g_warning ("invalid name template %s: conversion specification must appear" " at the end of the GST_PAD_REQUEST padtemplate name", name); return FALSE; } } return TRUE; } /** * gst_pad_template_new: * @name_template: the name template * @direction: the direction for the template * @presence: the presence of the pad * @caps: a list of capabilities for the template * @...: more capabilities * * Creates a new padtemplate from the given arguments. * * Returns: the new padtemplate */ GstPadTemplate* gst_pad_template_new (gchar *name_template, GstPadDirection direction, GstPadPresence presence, GstCaps *caps, ...) { GstPadTemplate *new; va_list var_args; GstCaps *thecaps = NULL; g_return_val_if_fail (name_template != NULL, NULL); if (!name_is_valid (name_template, presence)) return NULL; new = g_object_new(gst_pad_template_get_type () ,NULL); GST_PAD_TEMPLATE_NAME_TEMPLATE (new) = name_template; GST_PAD_TEMPLATE_DIRECTION (new) = direction; GST_PAD_TEMPLATE_PRESENCE (new) = presence; va_start (var_args, caps); while (caps) { new->fixed &= caps->fixed; thecaps = gst_caps_append (thecaps, caps); caps = va_arg (var_args, GstCaps*); } va_end (var_args); GST_PAD_TEMPLATE_CAPS (new) = thecaps; return new; } /** * gst_pad_template_get_caps: * @templ: the padtemplate to use * * Get the capabilities of the padtemplate * * Returns: a GstCaps* */ GstCaps* gst_pad_template_get_caps (GstPadTemplate *templ) { g_return_val_if_fail (templ != NULL, NULL); return GST_PAD_TEMPLATE_CAPS (templ); } #ifndef GST_DISABLE_LOADSAVE /** * gst_pad_template_save_thyself: * @templ: the padtemplate to save * @parent: the parent XML tree * * Saves the padtemplate into XML. * * Returns: the new XML tree */ xmlNodePtr gst_pad_template_save_thyself (GstPadTemplate *templ, xmlNodePtr parent) { xmlNodePtr subtree; guchar *presence; GST_DEBUG (GST_CAT_XML,"saving padtemplate %s", templ->name_template); xmlNewChild(parent,NULL,"nametemplate", templ->name_template); xmlNewChild(parent,NULL,"direction", (templ->direction == GST_PAD_SINK? "sink":"src")); switch (templ->presence) { case GST_PAD_ALWAYS: presence = "always"; break; case GST_PAD_SOMETIMES: presence = "sometimes"; break; case GST_PAD_REQUEST: presence = "request"; break; default: presence = "unknown"; break; } xmlNewChild(parent,NULL,"presence", presence); if (GST_PAD_TEMPLATE_CAPS (templ)) { subtree = xmlNewChild (parent, NULL, "caps", NULL); gst_caps_save_thyself (GST_PAD_TEMPLATE_CAPS (templ), subtree); } return parent; } /** * gst_pad_template_load_thyself: * @parent: the source XML tree * * Loads a padtemplate from the XML tree. * * Returns: the new padtemplate */ GstPadTemplate* gst_pad_template_load_thyself (xmlNodePtr parent) { xmlNodePtr field = parent->xmlChildrenNode; GstPadTemplate *factory; gchar *name_template = NULL; GstPadDirection direction = GST_PAD_UNKNOWN; GstPadPresence presence = GST_PAD_ALWAYS; GstCaps *caps = NULL; while (field) { if (!strcmp(field->name, "nametemplate")) { name_template = xmlNodeGetContent(field); } if (!strcmp(field->name, "direction")) { gchar *value = xmlNodeGetContent(field); if (!strcmp(value, "sink")) { direction = GST_PAD_SINK; } else if (!strcmp(value, "src")) { direction = GST_PAD_SRC; } g_free (value); } if (!strcmp(field->name, "presence")) { gchar *value = xmlNodeGetContent(field); if (!strcmp(value, "always")) { presence = GST_PAD_ALWAYS; } else if (!strcmp(value, "sometimes")) { presence = GST_PAD_SOMETIMES; } else if (!strcmp(value, "request")) { presence = GST_PAD_REQUEST; } g_free (value); } else if (!strcmp(field->name, "caps")) { caps = gst_caps_load_thyself (field); } field = field->next; } factory = gst_pad_template_new (name_template, direction, presence, caps, NULL); return factory; } #endif /* !GST_DISABLE_LOADSAVE */ /** * gst_pad_set_element_private: * @pad: the pad to set the private data to * @priv: The private data to attach to the pad * * Set the given private data pointer to the pad. This * function can only be used by the element that own the * pad. */ void gst_pad_set_element_private (GstPad *pad, gpointer priv) { pad->element_private = priv; } /** * gst_pad_get_element_private: * @pad: the pad to get the private data of * * Get the private data of a pad. The private data can * only be set by the parent element of this pad. * * Returns: a pointer to the private data. */ gpointer gst_pad_get_element_private (GstPad *pad) { return pad->element_private; } /***** ghost pads *****/ GType _gst_ghost_pad_type = 0; static void gst_ghost_pad_class_init (GstGhostPadClass *klass); static void gst_ghost_pad_init (GstGhostPad *pad); static GstPad *ghost_pad_parent_class = NULL; /* static guint gst_ghost_pad_signals[LAST_SIGNAL] = { 0 }; */ GType gst_ghost_pad_get_type (void) { if (!_gst_ghost_pad_type) { static const GTypeInfo pad_info = { sizeof (GstGhostPadClass), NULL, NULL, (GClassInitFunc) gst_ghost_pad_class_init, NULL, NULL, sizeof(GstGhostPad), 8, (GInstanceInitFunc) gst_ghost_pad_init, NULL }; _gst_ghost_pad_type = g_type_register_static (GST_TYPE_PAD, "GstGhostPad", &pad_info, 0); } return _gst_ghost_pad_type; } static void gst_ghost_pad_class_init (GstGhostPadClass *klass) { GObjectClass *gobject_class; gobject_class = (GObjectClass*) klass; ghost_pad_parent_class = g_type_class_ref (GST_TYPE_PAD); } static void gst_ghost_pad_init (GstGhostPad *pad) { pad->realpad = NULL; } /** * gst_ghost_pad_new: * @name: name of the new ghost pad * @pad: the pad to create a ghost pad of * * Create a new ghost pad associated with the given pad. * * Returns: new ghost pad */ GstPad* gst_ghost_pad_new (gchar *name, GstPad *pad) { GstGhostPad *ghostpad; GstRealPad *realpad; g_return_val_if_fail (name != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); ghostpad = g_object_new (gst_ghost_pad_get_type () ,NULL); gst_pad_set_name (GST_PAD (ghostpad), name); realpad = (GstRealPad *) pad; while (!GST_IS_REAL_PAD (realpad)) { realpad = GST_PAD_REALIZE (realpad); } GST_GPAD_REALPAD (ghostpad) = realpad; GST_PAD_PAD_TEMPLATE (ghostpad) = GST_PAD_PAD_TEMPLATE (pad); /* add ourselves to the real pad's list of ghostpads */ gst_pad_add_ghost_pad (pad, GST_PAD (ghostpad)); /* FIXME need to ref the real pad here... ? */ GST_DEBUG (GST_CAT_PADS, "created ghost pad \"%s\"", name); return GST_PAD (ghostpad); } static void gst_pad_event_default_dispatch (GstPad *pad, GstElement *element, GstEvent *event) { GList *pads = element->pads; while (pads) { GstPad *eventpad = GST_PAD (pads->data); pads = g_list_next (pads); /* for all pads in the opposite direction that are connected */ if (GST_PAD_DIRECTION (eventpad) != GST_PAD_DIRECTION (pad) && GST_PAD_IS_CONNECTED (eventpad)) { if (GST_PAD_DIRECTION (eventpad) == GST_PAD_SRC) { gst_pad_push (eventpad, GST_BUFFER (gst_event_copy (event))); } else { GstPad *peerpad = GST_PAD_CAST (GST_RPAD_PEER (eventpad)); gst_pad_send_event (peerpad, gst_event_copy (event)); } } } } /** * gst_pad_event_default: * @pad: the pad to operate on * @event: the event to handle * * Invoke the default event handler for the given pad. */ void gst_pad_event_default (GstPad *pad, GstEvent *event) { GstElement *element = GST_PAD_PARENT (pad); g_signal_emit (G_OBJECT (pad), gst_real_pad_signals[REAL_EVENT_RECEIVED], 0, event); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_EOS: gst_element_set_eos (element); gst_pad_event_default_dispatch (pad, element, event); /* we have to try to schedule another element because this one is disabled */ gst_element_yield (element); break; case GST_EVENT_FLUSH: default: gst_pad_event_default_dispatch (pad, element, event); break; } } /** * gst_pad_send_event: * @pad: the pad to send the event to * @event: the event to send to the pad. * * Send the event to the pad. * * Returns: TRUE if the event was handled. */ gboolean gst_pad_send_event (GstPad *pad, GstEvent *event) { gboolean handled = FALSE; g_return_val_if_fail (event, FALSE); if (GST_EVENT_SRC (event) == NULL) GST_EVENT_SRC (event) = gst_object_ref (GST_OBJECT (pad)); GST_DEBUG (GST_CAT_EVENT, "have event %d on pad %s:%s", GST_EVENT_TYPE (event), GST_DEBUG_PAD_NAME (pad)); if (GST_RPAD_EVENTFUNC (pad)) handled = GST_RPAD_EVENTFUNC (pad) (pad, event); else { GST_DEBUG(GST_CAT_EVENT, "there's no event function for pad %s:%s", GST_DEBUG_PAD_NAME (pad)); } if (!handled) { GST_DEBUG(GST_CAT_EVENT, "proceeding with default event behavior here"); gst_pad_event_default (pad, event); handled = TRUE; } return handled; }