/* 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 "gstmarshal.h" #include "gstutils.h" #include "gstelement.h" #include "gstbin.h" #include "gstscheduler.h" #include "gstevent.h" #include "gstinfo.h" #include "gsterror.h" #include "gstvalue.h" GST_DEBUG_CATEGORY_STATIC (debug_dataflow); #define DEBUG_DATA(obj,data,notice) G_STMT_START{\ if (!data) { \ GST_CAT_DEBUG_OBJECT (debug_dataflow, obj, "NULL data value"); \ } else if (GST_IS_EVENT (data)) { \ GST_CAT_DEBUG_OBJECT (debug_dataflow, obj, "%s event %p (type %d, refcount %d)", notice, data, \ GST_EVENT_TYPE (data), GST_DATA_REFCOUNT_VALUE (data)); \ } else { \ GST_CAT_LOG_OBJECT (debug_dataflow, obj, "%s buffer %p (size %u, refcount %d)", notice, data, \ GST_BUFFER_SIZE (data), GST_BUFFER_REFCOUNT_VALUE (data)); \ } \ }G_STMT_END #define GST_CAT_DEFAULT GST_CAT_PADS /* realize and pad and grab the lock of the realized pad. */ #define GST_PAD_REALIZE_AND_LOCK(pad, realpad, lost_ghostpad) \ GST_LOCK (pad); \ realpad = GST_PAD_REALIZE (pad); \ if (G_UNLIKELY (realpad == NULL)) { \ GST_UNLOCK (pad); \ goto lost_ghostpad; \ } \ if (G_UNLIKELY (pad != GST_PAD_CAST (realpad))) { \ GST_LOCK (realpad); \ GST_UNLOCK (pad); \ } 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); #ifndef GST_DISABLE_LOADSAVE static xmlNodePtr gst_pad_save_thyself (GstObject * object, xmlNodePtr parent); #endif static GstObject *pad_parent_class = NULL; GType gst_pad_get_type (void) { if (!_gst_pad_type) { static const GTypeInfo pad_info = { sizeof (GstPadClass), NULL, NULL, (GClassInitFunc) gst_pad_class_init, NULL, NULL, sizeof (GstPad), 0, (GInstanceInitFunc) gst_pad_init, NULL }; _gst_pad_type = g_type_register_static (GST_TYPE_OBJECT, "GstPad", &pad_info, 0); GST_DEBUG_CATEGORY_INIT (debug_dataflow, "GST_DATAFLOW", GST_DEBUG_BOLD | GST_DEBUG_FG_GREEN, "dataflow inside pads"); } return _gst_pad_type; } static void gst_pad_class_init (GstPadClass * klass) { GObjectClass *gobject_class; gobject_class = (GObjectClass *) klass; pad_parent_class = g_type_class_ref (GST_TYPE_OBJECT); gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_pad_dispose); } static void gst_pad_init (GstPad * pad) { /* all structs are initialized to NULL by glib */ } static void gst_pad_dispose (GObject * object) { GstPad *pad = GST_PAD (object); gst_pad_set_pad_template (pad, NULL); /* FIXME, we have links to many other things like caps * and the peer pad... */ G_OBJECT_CLASS (pad_parent_class)->dispose (object); } /***** Then do the Real Pad *****/ /* Pad signals and args */ enum { REAL_LINKED, REAL_UNLINKED, REAL_REQUEST_LINK, /* 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); static GstCaps *gst_real_pad_get_caps_unlocked (GstRealPad * realpad); GType _gst_real_pad_type = 0; static GstPad *real_pad_parent_class = NULL; static guint gst_real_pad_signals[REAL_LAST_SIGNAL] = { 0 }; GType gst_real_pad_get_type (void) { if (!_gst_real_pad_type) { static const GTypeInfo pad_info = { sizeof (GstRealPadClass), NULL, NULL, (GClassInitFunc) gst_real_pad_class_init, NULL, NULL, sizeof (GstRealPad), 0, (GInstanceInitFunc) gst_real_pad_init, NULL }; _gst_real_pad_type = g_type_register_static (GST_TYPE_PAD, "GstRealPad", &pad_info, 0); } return _gst_real_pad_type; } static void gst_real_pad_class_init (GstRealPadClass * klass) { GObjectClass *gobject_class; GstObjectClass *gstobject_class; gobject_class = (GObjectClass *) klass; gstobject_class = (GstObjectClass *) klass; real_pad_parent_class = g_type_class_ref (GST_TYPE_PAD); gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_real_pad_dispose); gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_real_pad_set_property); gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_real_pad_get_property); gst_real_pad_signals[REAL_LINKED] = g_signal_new ("linked", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRealPadClass, linked), NULL, NULL, gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD); gst_real_pad_signals[REAL_UNLINKED] = g_signal_new ("unlinked", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRealPadClass, unlinked), NULL, NULL, gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD); gst_real_pad_signals[REAL_REQUEST_LINK] = g_signal_new ("request_link", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRealPadClass, request_link), NULL, NULL, gst_marshal_VOID__OBJECT, G_TYPE_NONE, 0); 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->peer = NULL; pad->chainfunc = 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_UNSET (pad, GST_PAD_ACTIVE); pad->stream_lock = g_mutex_new (); pad->stream_cond = g_cond_new (); pad->block_cond = g_cond_new (); 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_ACTIVE)); break; case REAL_ARG_CAPS: g_value_set_boxed (value, GST_PAD_CAPS (GST_REAL_PAD (object))); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } /* FIXME-0.9: Replace these custom functions with proper inheritance via _init functions and object properties. update: probably later in the cycle. */ /** * 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. * This function makes a copy of the name so you can safely free the name. * * Returns: a new #GstPad, or NULL in case of an error. * * MT safe. */ GstPad * gst_pad_custom_new (GType type, const gchar * name, GstPadDirection direction) { GstRealPad *pad; pad = g_object_new (type, NULL); gst_object_set_name (GST_OBJECT (pad), name); GST_RPAD_DIRECTION (pad) = direction; return GST_PAD_CAST (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. * This function makes a copy of the name so you can safely free the name. * * Returns: a new #GstPad, or NULL in case of an error. * * MT safe. */ 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. * This function makes a copy of the name so you can safely free the name. * * Returns: a new #GstPad, or NULL in case of an error. */ GstPad * gst_pad_custom_new_from_template (GType type, GstPadTemplate * templ, const gchar * name) { GstPad *pad; g_return_val_if_fail (GST_IS_PAD_TEMPLATE (templ), NULL); pad = gst_pad_custom_new (type, name, templ->direction); gst_pad_set_pad_template (pad, templ); return pad; } /** * gst_pad_new_from_template: * @templ: the pad template to use * @name: the name of the element * * Creates a new real pad with the given name from the given template. * If name is NULL, a guaranteed unique name (across all pads) * will be assigned. * This function makes a copy of the name so you can safely free the name. * * 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. The direction of the pad is * decided at construction time so this function does not take * the LOCK. * * Returns: the #GstPadDirection of the pad. * * MT safe. */ GstPadDirection gst_pad_get_direction (GstPad * pad) { GstPadDirection result; /* pad unkown is a little silly but we need some sort of * error return value */ g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_UNKNOWN); /* since the direction cannot change at runtime we can * safely read without locking. */ result = GST_PAD_DIRECTION (pad); return result; } /** * gst_pad_set_active: * @pad: the #GstPad to activate or deactivate. * @active: TRUE to activate the pad. * * Activates or deactivates the given pad. * * Returns: TRUE if the operation was successfull. * * MT safe. */ gboolean gst_pad_set_active (GstPad * pad, GstActivateMode mode) { GstRealPad *realpad; gboolean old; GstPadActivateFunction activatefunc; gboolean active; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); GST_PAD_REALIZE_AND_LOCK (pad, realpad, lost_ghostpad); active = (mode != GST_ACTIVATE_NONE); old = GST_PAD_IS_ACTIVE (realpad); /* if nothing changed, we can just exit */ if (G_UNLIKELY (old == active)) goto exit; /* make sure data is disallowed when going inactive */ if (!active) { GST_CAT_DEBUG (GST_CAT_PADS, "de-activating pad %s:%s", GST_DEBUG_PAD_NAME (realpad)); GST_FLAG_UNSET (realpad, GST_PAD_ACTIVE); /* unlock blocked pads so element can resume and stop */ GST_PAD_BLOCK_SIGNAL (realpad); } activatefunc = realpad->activatefunc; if (activatefunc) { gboolean result; GST_CAT_DEBUG (GST_CAT_PADS, "calling activate function on pad %s:%s with mode %d", GST_DEBUG_PAD_NAME (realpad), mode); /* unlock so element can sync */ GST_UNLOCK (realpad); result = activatefunc (GST_PAD_CAST (realpad), mode); /* and lock again */ GST_LOCK (realpad); if (result == FALSE) goto activate_error; } /* when going to active alow data passing now */ if (active) { GST_CAT_DEBUG (GST_CAT_PADS, "activating pad %s:%s", GST_DEBUG_PAD_NAME (realpad)); GST_FLAG_SET (realpad, GST_PAD_ACTIVE); } exit: GST_UNLOCK (realpad); return TRUE; /* errors */ lost_ghostpad: { return FALSE; } activate_error: { GST_CAT_DEBUG (GST_CAT_PADS, "activate function returned FALSE for pad %s:%s", GST_DEBUG_PAD_NAME (realpad)); GST_UNLOCK (realpad); return FALSE; } } /** * gst_pad_is_active: * @pad: the #GstPad to query * * Query if a pad is active * * Returns: TRUE if the pad is active. * * MT safe. */ gboolean gst_pad_is_active (GstPad * pad) { gboolean result = FALSE; GstRealPad *realpad; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); GST_PAD_REALIZE_AND_LOCK (pad, realpad, lost_ghostpad); result = GST_FLAG_IS_SET (realpad, GST_PAD_ACTIVE); GST_UNLOCK (realpad); return result; lost_ghostpad: { return FALSE; } } /** * gst_pad_set_blocked_async: * @pad: the #GstPad to block or unblock * @blocked: boolean indicating we should block or unblock * @callback: #GstPadBlockCallback that will be called when the * operation succeeds. * @user_data: user data passed to the callback * * Blocks or unblocks the dataflow on a pad. The provided callback * is called when the operation succeeds. This can take a while as * the pad can only become blocked when real dataflow is happening. * When the pipeline is stalled, for example in PAUSED, this can * take an indeterminate amount of time. * You can pass NULL as the callback to make this call block. Be * carefull with this blocking call as it might not return for * reasons stated above. * * Returns: TRUE if the pad could be blocked. This function can fail * if wrong parameters were passed or the pad was already in the * requested state. * * MT safe. */ gboolean gst_pad_set_blocked_async (GstPad * pad, gboolean blocked, GstPadBlockCallback callback, gpointer user_data) { gboolean was_blocked; GstRealPad *realpad; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); GST_PAD_REALIZE_AND_LOCK (pad, realpad, lost_ghostpad); was_blocked = GST_RPAD_IS_BLOCKED (realpad); if (G_UNLIKELY (was_blocked == blocked)) goto had_right_state; if (blocked) { GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, realpad, "blocking pad %s:%s", GST_DEBUG_PAD_NAME (realpad)); GST_FLAG_SET (realpad, GST_PAD_BLOCKED); realpad->block_callback = callback; realpad->block_data = user_data; if (!callback) { GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, realpad, "waiting for block"); GST_PAD_BLOCK_WAIT (realpad); GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, realpad, "blocked"); } } else { GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, realpad, "unblocking pad %s:%s", GST_DEBUG_PAD_NAME (realpad)); GST_FLAG_UNSET (realpad, GST_PAD_BLOCKED); realpad->block_callback = callback; realpad->block_data = user_data; if (callback) { GST_PAD_BLOCK_SIGNAL (realpad); } else { GST_PAD_BLOCK_SIGNAL (realpad); GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, realpad, "waiting for unblock"); GST_PAD_BLOCK_WAIT (realpad); GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, realpad, "unblocked"); } } GST_UNLOCK (realpad); return TRUE; lost_ghostpad: { return FALSE; } had_right_state: { GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, realpad, "pad %s:%s was in right state", GST_DEBUG_PAD_NAME (realpad)); GST_UNLOCK (realpad); return FALSE; } } /** * gst_pad_set_blocked: * @pad: the #GstPad to block or unblock * @blocked: boolean indicating we should block or unblock * * Blocks or unblocks the dataflow on a pad. This function is * a shortcut for @gst_pad_set_blocked_async() with a NULL * callback. * * Returns: TRUE if the pad could be blocked. This function can fail * wrong parameters were passed or the pad was already in the * requested state. * * MT safe. */ gboolean gst_pad_set_blocked (GstPad * pad, gboolean blocked) { return gst_pad_set_blocked_async (pad, blocked, NULL, NULL); } /** * gst_pad_is_blocked: * @pad: the #GstPad to query * * Checks if the pad is blocked or not. This function returns the * last requested state of the pad. It is not certain that the pad * is actually blocked at this point. * * Returns: TRUE if the pad is blocked. * * MT safe. */ gboolean gst_pad_is_blocked (GstPad * pad) { gboolean result = FALSE; GstRealPad *realpad; g_return_val_if_fail (GST_IS_PAD (pad), result); GST_PAD_REALIZE_AND_LOCK (pad, realpad, lost_ghostpad); result = GST_FLAG_IS_SET (realpad, GST_PAD_BLOCKED); GST_UNLOCK (realpad); return result; lost_ghostpad: { return FALSE; } } /** * gst_pad_set_activate_function: * @pad: a real sink #GstPad. * @chain: the #GstPadActivateFunction to set. * * Sets the given activate function for the pad. The activate function is called to * start or stop dataflow on a pad. */ void gst_pad_set_activate_function (GstPad * pad, GstPadActivateFunction activate) { g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_ACTIVATEFUNC (pad) = activate; GST_CAT_DEBUG (GST_CAT_PADS, "activatefunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (activate)); } /** * gst_pad_set_loop_function: * @pad: a real sink #GstPad. * @chain: the #GstPadLoopFunction to set. * * Sets the given loop function for the pad. The loop function is called * repeadedly to pull/push buffers from/to the peer pad. */ void gst_pad_set_loop_function (GstPad * pad, GstPadLoopFunction loop) { g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_LOOPFUNC (pad) = loop; GST_CAT_DEBUG (GST_CAT_PADS, "loopfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (loop)); } /** * gst_pad_set_chain_function: * @pad: a real sink #GstPad. * @chain: the #GstPadChainFunction to set. * * Sets the given chain function for the pad. The chain function is called to * process a #GstBuffer input buffer. */ void gst_pad_set_chain_function (GstPad * pad, GstPadChainFunction chain) { g_return_if_fail (GST_IS_REAL_PAD (pad)); g_return_if_fail (GST_RPAD_DIRECTION (pad) == GST_PAD_SINK); GST_RPAD_CHAINFUNC (pad) = chain; GST_CAT_DEBUG (GST_CAT_PADS, "chainfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (chain)); } /** * gst_pad_set_getrange_function: * @pad: a real source #GstPad. * @get: the #GstPadGetRangeFunction to set. * * Sets the given getrange function for the pad. The getrange function is called to * produce a new #GstBuffer to start the processing pipeline. Getrange functions cannot * return %NULL. */ void gst_pad_set_getrange_function (GstPad * pad, GstPadGetRangeFunction get) { g_return_if_fail (GST_IS_REAL_PAD (pad)); g_return_if_fail (GST_RPAD_DIRECTION (pad) == GST_PAD_SRC); GST_RPAD_GETRANGEFUNC (pad) = get; GST_CAT_DEBUG (GST_CAT_PADS, "getrangefunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (get)); } /** * gst_pad_set_event_function: * @pad: a real source #GstPad. * @event: the #GstPadEventFunction to set. * * Sets the given event handler for the pad. */ void gst_pad_set_event_function (GstPad * pad, GstPadEventFunction event) { g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_EVENTFUNC (pad) = event; GST_CAT_DEBUG (GST_CAT_PADS, "eventfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (event)); } /** * gst_pad_set_event_mask_function: * @pad: a real #GstPad of either direction. * @mask_func: the #GstPadEventMaskFunction to set. * * Sets the given event mask function for the pad. */ void gst_pad_set_event_mask_function (GstPad * pad, GstPadEventMaskFunction mask_func) { g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_EVENTMASKFUNC (pad) = mask_func; GST_CAT_DEBUG (GST_CAT_PADS, "eventmaskfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (mask_func)); } /** * gst_pad_get_event_masks: * @pad: a #GstPad. * * Gets the array of eventmasks from the given pad. * * Returns: a zero-terminated array of #GstEventMask, or NULL if the pad does * not have an event mask function. */ const GstEventMask * gst_pad_get_event_masks (GstPad * pad) { GstRealPad *rpad; g_return_val_if_fail (GST_IS_PAD (pad), NULL); rpad = GST_PAD_REALIZE (pad); g_return_val_if_fail (rpad, NULL); if (GST_RPAD_EVENTMASKFUNC (rpad)) return GST_RPAD_EVENTMASKFUNC (rpad) (GST_PAD (pad)); return NULL; } static gboolean gst_pad_get_event_masks_dispatcher (GstPad * pad, const GstEventMask ** data) { *data = gst_pad_get_event_masks (pad); return TRUE; } /** * gst_pad_get_event_masks_default: * @pad: a #GstPad. * * Invokes the default event masks dispatcher on the pad. * * Returns: a zero-terminated array of #GstEventMask, or NULL if none of the * internally-linked pads have an event mask function. */ const GstEventMask * gst_pad_get_event_masks_default (GstPad * pad) { GstEventMask *result = NULL; g_return_val_if_fail (GST_IS_PAD (pad), NULL); gst_pad_dispatcher (pad, (GstPadDispatcherFunction) gst_pad_get_event_masks_dispatcher, &result); return result; } /** * gst_pad_set_convert_function: * @pad: a real #GstPad of either direction. * @convert: the #GstPadConvertFunction to set. * * Sets the given convert function for the pad. */ void gst_pad_set_convert_function (GstPad * pad, GstPadConvertFunction convert) { g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_CONVERTFUNC (pad) = convert; GST_CAT_DEBUG (GST_CAT_PADS, "convertfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (convert)); } /** * gst_pad_set_query_function: * @pad: a real #GstPad of either direction. * @query: the #GstPadQueryFunction to set. * * Set the given query function for the pad. */ void gst_pad_set_query_function (GstPad * pad, GstPadQueryFunction query) { g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_QUERYFUNC (pad) = query; GST_CAT_DEBUG (GST_CAT_PADS, "queryfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (query)); } /** * gst_pad_set_query_type_function: * @pad: a real #GstPad of either direction. * @type_func: the #GstPadQueryTypeFunction to set. * * Set the given query type function for the pad. */ void gst_pad_set_query_type_function (GstPad * pad, GstPadQueryTypeFunction type_func) { g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_QUERYTYPEFUNC (pad) = type_func; GST_CAT_DEBUG (GST_CAT_PADS, "querytypefunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (type_func)); } /** * gst_pad_get_query_types: * @pad: a #GstPad. * * Get an array of supported queries that can be performed * on this pad. * * Returns: a zero-terminated array of #GstQueryType. */ const GstQueryType * gst_pad_get_query_types (GstPad * pad) { GstRealPad *rpad; g_return_val_if_fail (GST_IS_PAD (pad), NULL); rpad = GST_PAD_REALIZE (pad); g_return_val_if_fail (rpad, NULL); if (GST_RPAD_QUERYTYPEFUNC (rpad)) return GST_RPAD_QUERYTYPEFUNC (rpad) (GST_PAD (pad)); return NULL; } static gboolean gst_pad_get_query_types_dispatcher (GstPad * pad, const GstQueryType ** data) { *data = gst_pad_get_query_types (pad); return TRUE; } /** * gst_pad_get_query_types_default: * @pad: a #GstPad. * * Invoke the default dispatcher for the query types on * the pad. * * Returns: an zero-terminated array of #GstQueryType, or NULL if none of the * internally-linked pads has a query types function. */ const GstQueryType * gst_pad_get_query_types_default (GstPad * pad) { GstQueryType *result = NULL; g_return_val_if_fail (GST_IS_PAD (pad), NULL); gst_pad_dispatcher (pad, (GstPadDispatcherFunction) gst_pad_get_query_types_dispatcher, &result); return result; } /** * gst_pad_set_internal_link_function: * @pad: a real #GstPad of either direction. * @intlink: the #GstPadIntLinkFunction to set. * * Sets the given internal link function for the pad. */ void gst_pad_set_internal_link_function (GstPad * pad, GstPadIntLinkFunction intlink) { g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_INTLINKFUNC (pad) = intlink; GST_CAT_DEBUG (GST_CAT_PADS, "internal link for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (intlink)); } /** * gst_pad_set_formats_function: * @pad: a real #GstPad of either direction. * @formats: the #GstPadFormatsFunction to set. * * Sets the given formats function for the pad. */ void gst_pad_set_formats_function (GstPad * pad, GstPadFormatsFunction formats) { g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_FORMATSFUNC (pad) = formats; GST_CAT_DEBUG (GST_CAT_PADS, "formats function for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (formats)); } /** * gst_pad_set_link_function: * @pad: a real #GstPad. * @link: the #GstPadLinkFunction to set. * * Sets the given link function for the pad. It will be called when the pad is * linked or relinked with caps. The caps passed to the link function is * the filtered caps for the connnection. It can contain a non fixed caps. * * The return value GST_PAD_LINK_OK should be used when the connection can be * made. * * The return value GST_PAD_LINK_REFUSED should be used when the connection * cannot be made for some reason. */ void gst_pad_set_link_function (GstPad * pad, GstPadLinkFunction link) { g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_LINKFUNC (pad) = link; GST_CAT_DEBUG (GST_CAT_PADS, "linkfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (link)); } /** * gst_pad_set_unlink_function: * @pad: a real #GstPad. * @unlink: the #GstPadUnlinkFunction to set. * * Sets the given unlink function for the pad. It will be called * when the pad is unlinked. */ void gst_pad_set_unlink_function (GstPad * pad, GstPadUnlinkFunction unlink) { g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_UNLINKFUNC (pad) = unlink; GST_CAT_DEBUG (GST_CAT_PADS, "unlinkfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (unlink)); } /** * gst_pad_set_getcaps_function: * @pad: a real #GstPad. * @getcaps: the #GstPadGetCapsFunction to set. * * Sets the given getcaps function for the pad. @getcaps should return the * allowable caps for a pad in the context of the element's state, its link to * other elements, and the devices or files it has opened. These caps must be a * subset of the pad template caps. In the NULL state with no links, @getcaps * should ideally return the same caps as the pad template. In rare * circumstances, an object property can affect the caps returned by @getcaps, * but this is discouraged. * * You do not need to call this function if @pad's allowed caps are always the * same as the pad template caps. This can only be true if the padtemplate * has fixed simple caps. * * For most filters, the caps returned by @getcaps is directly affected by the * allowed caps on other pads. For demuxers and decoders, the caps returned by * the srcpad's getcaps function is directly related to the stream data. Again, * @getcaps should return the most specific caps it reasonably can, since this * helps with autoplugging. * * Note that the return value from @getcaps is owned by the caller, so the caller * should unref the caps after usage. */ void gst_pad_set_getcaps_function (GstPad * pad, GstPadGetCapsFunction getcaps) { g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_GETCAPSFUNC (pad) = getcaps; GST_CAT_DEBUG (GST_CAT_PADS, "getcapsfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (getcaps)); } /** * gst_pad_set_acceptcaps_function: * @pad: a real #GstPad. * @acceptcaps: the #GstPadAcceptCapsFunction to set. * * Sets the given acceptcaps function for the pad. The acceptcaps function * will be called to check if the pad can accept the given caps. */ void gst_pad_set_acceptcaps_function (GstPad * pad, GstPadAcceptCapsFunction acceptcaps) { g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_ACCEPTCAPSFUNC (pad) = acceptcaps; GST_CAT_DEBUG (GST_CAT_PADS, "acceptcapsfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (acceptcaps)); } /** * gst_pad_set_fixatecaps_function: * @pad: a real #GstPad. * @fixatecaps: the #GstPadFixateCapsFunction to set. * * Sets the given fixatecaps function for the pad. The fixatecaps function * will be called whenever the default values for a GstCaps needs to be * filled in. */ void gst_pad_set_fixatecaps_function (GstPad * pad, GstPadFixateCapsFunction fixatecaps) { g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_FIXATECAPSFUNC (pad) = fixatecaps; GST_CAT_DEBUG (GST_CAT_PADS, "fixatecapsfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (fixatecaps)); } /** * gst_pad_set_setcaps_function: * @pad: a real #GstPad. * @setcaps: the #GstPadSetCapsFunction to set. * * Sets the given setcaps function for the pad. The setcaps function * will be called whenever a buffer with a new media type is pushed or * pulled from the pad. The pad/element needs to update it's internal * structures to process the new media type. If this new type is not * acceptable, the setcaps function should return FALSE. */ void gst_pad_set_setcaps_function (GstPad * pad, GstPadSetCapsFunction setcaps) { g_return_if_fail (GST_IS_REAL_PAD (pad)); GST_RPAD_SETCAPSFUNC (pad) = setcaps; GST_CAT_DEBUG (GST_CAT_PADS, "setcapsfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (setcaps)); } /** * gst_pad_set_bufferalloc_function: * @pad: a real sink #GstPad. * @bufalloc: the #GstPadBufferAllocFunction to set. * * Sets the given bufferalloc function for the pad. Note that the * bufferalloc function can only be set on sinkpads. */ void gst_pad_set_bufferalloc_function (GstPad * pad, GstPadBufferAllocFunction bufalloc) { g_return_if_fail (GST_IS_REAL_PAD (pad)); g_return_if_fail (GST_PAD_IS_SINK (pad)); GST_RPAD_BUFFERALLOCFUNC (pad) = bufalloc; GST_CAT_DEBUG (GST_CAT_PADS, "bufferallocfunc for %s:%s set to %s", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (bufalloc)); } /** * gst_pad_unlink: * @srcpad: the source #GstPad to unlink. * @sinkpad: the sink #GstPad to unlink. * * Unlinks the source pad from the sink pad. Will emit the "unlinked" signal on * both pads. * * Returns: TRUE if the pads were unlinked. This function returns FALSE if * the pads were not linked together. * * MT safe. */ gboolean gst_pad_unlink (GstPad * srcpad, GstPad * sinkpad) { GstRealPad *realsrc, *realsink; g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE); g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE); 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); GST_PAD_REALIZE_AND_LOCK (srcpad, realsrc, lost_src_ghostpad); if (G_UNLIKELY (GST_RPAD_DIRECTION (realsrc) != GST_PAD_SRC)) goto not_srcpad; GST_PAD_REALIZE_AND_LOCK (sinkpad, realsink, lost_sink_ghostpad); if (G_UNLIKELY (GST_RPAD_DIRECTION (realsink) != GST_PAD_SINK)) goto not_sinkpad; if (G_UNLIKELY (GST_RPAD_PEER (realsrc) != realsink)) goto not_linked_together; if (GST_RPAD_UNLINKFUNC (realsrc)) { GST_RPAD_UNLINKFUNC (realsrc) (GST_PAD (realsrc)); } if (GST_RPAD_UNLINKFUNC (realsink)) { GST_RPAD_UNLINKFUNC (realsink) (GST_PAD (realsink)); } /* first clear peers */ GST_RPAD_PEER (realsrc) = NULL; GST_RPAD_PEER (realsink) = NULL; /* clear filter, note that we leave the pad caps as they are */ gst_caps_replace (&GST_RPAD_APPFILTER (realsrc), NULL); gst_caps_replace (&GST_RPAD_APPFILTER (realsink), NULL); GST_UNLOCK (realsink); GST_UNLOCK (realsrc); /* 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 (realsrc), GST_DEBUG_PAD_NAME (realsink)); return TRUE; lost_src_ghostpad: { return FALSE; } not_srcpad: { g_critical ("pad %s is not a source pad", GST_PAD_NAME (realsrc)); GST_UNLOCK (realsrc); return FALSE; } lost_sink_ghostpad: { GST_UNLOCK (realsrc); return FALSE; } not_sinkpad: { g_critical ("pad %s is not a sink pad", GST_PAD_NAME (realsink)); GST_UNLOCK (realsink); GST_UNLOCK (realsrc); return FALSE; } not_linked_together: { /* we do not emit a warning in this case because unlinking cannot * be made MT safe.*/ GST_UNLOCK (realsink); GST_UNLOCK (realsrc); return FALSE; } } /** * gst_pad_is_linked: * @pad: pad to check * * Checks if a @pad is linked to another pad or not. * * Returns: TRUE if the pad is linked, FALSE otherwise. * * MT safe. */ gboolean gst_pad_is_linked (GstPad * pad) { gboolean result; GstRealPad *realpad; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); GST_PAD_REALIZE_AND_LOCK (pad, realpad, lost_ghostpad); result = (GST_PAD_PEER (realpad) != NULL); GST_UNLOCK (realpad); return result; lost_ghostpad: { return FALSE; } } /* FIXME leftover from an attempt at refactoring... */ static GstPadLinkReturn gst_pad_link_prepare_filtered (GstPad * srcpad, GstPad * sinkpad, GstRealPad ** outrealsrc, GstRealPad ** outrealsink, const GstCaps * filtercaps) { GstRealPad *realsrc, *realsink; /* generic checks */ g_return_val_if_fail (GST_IS_PAD (srcpad), GST_PAD_LINK_REFUSED); g_return_val_if_fail (GST_IS_PAD (sinkpad), GST_PAD_LINK_REFUSED); 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 */ GST_PAD_REALIZE_AND_LOCK (srcpad, realsrc, lost_src_ghostpad); if (G_UNLIKELY (GST_RPAD_DIRECTION (realsrc) != GST_PAD_SRC)) goto not_srcpad; if (G_UNLIKELY (GST_RPAD_PEER (realsrc) != NULL)) goto src_was_linked; GST_PAD_REALIZE_AND_LOCK (sinkpad, realsink, lost_sink_ghostpad); if (G_UNLIKELY (GST_RPAD_DIRECTION (realsink) != GST_PAD_SINK)) goto not_sinkpad; if (G_UNLIKELY (GST_RPAD_PEER (realsink) != NULL)) goto sink_was_linked; 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)); } *outrealsrc = realsrc; *outrealsink = realsink; /* check pad caps for non-empty intersection */ { GstCaps *srccaps; GstCaps *sinkcaps; srccaps = gst_real_pad_get_caps_unlocked (realsrc); sinkcaps = gst_real_pad_get_caps_unlocked (realsink); GST_CAT_DEBUG (GST_CAT_CAPS, "got caps %p and %p", srccaps, sinkcaps); if (srccaps && sinkcaps) { GstCaps *caps; caps = gst_caps_intersect (srccaps, sinkcaps); GST_CAT_DEBUG (GST_CAT_CAPS, "intersection caps %p %" GST_PTR_FORMAT, caps, caps); if (filtercaps) { GstCaps *tmp; tmp = gst_caps_intersect (caps, filtercaps); gst_caps_unref (caps); caps = tmp; } if (!caps || gst_caps_is_empty (caps)) goto no_format; } } /* FIXME check pad scheduling for non-empty intersection */ /* update filter */ if (filtercaps) { GstCaps *filtercopy; filtercopy = gst_caps_copy (filtercaps); filtercopy = gst_caps_ref (filtercopy); gst_caps_replace (&GST_PAD_APPFILTER (realsrc), filtercopy); gst_caps_replace (&GST_PAD_APPFILTER (realsink), filtercopy); } else { gst_caps_replace (&GST_PAD_APPFILTER (realsrc), NULL); gst_caps_replace (&GST_PAD_APPFILTER (realsink), NULL); } return GST_PAD_LINK_OK; lost_src_ghostpad: { return GST_PAD_LINK_REFUSED; } not_srcpad: { g_critical ("pad %s is not a source pad", GST_PAD_NAME (realsrc)); GST_UNLOCK (realsrc); return GST_PAD_LINK_WRONG_DIRECTION; } src_was_linked: { GST_CAT_INFO (GST_CAT_PADS, "src %s:%s was linked", GST_DEBUG_PAD_NAME (realsrc)); /* we do not emit a warning in this case because unlinking cannot * be made MT safe.*/ GST_UNLOCK (realsrc); return GST_PAD_LINK_WAS_LINKED; } lost_sink_ghostpad: { GST_DEBUG ("lost sink ghostpad"); GST_UNLOCK (realsrc); return GST_PAD_LINK_REFUSED; } not_sinkpad: { g_critical ("pad %s is not a sink pad", GST_PAD_NAME (realsink)); GST_UNLOCK (realsink); GST_UNLOCK (realsrc); return GST_PAD_LINK_WRONG_DIRECTION; } sink_was_linked: { GST_CAT_INFO (GST_CAT_PADS, "sink %s:%s was linked", GST_DEBUG_PAD_NAME (realsink)); /* we do not emit a warning in this case because unlinking cannot * be made MT safe.*/ GST_UNLOCK (realsink); GST_UNLOCK (realsrc); return GST_PAD_LINK_WAS_LINKED; } no_format: { GST_CAT_INFO (GST_CAT_PADS, "caps are incompatible"); GST_UNLOCK (realsink); GST_UNLOCK (realsrc); return GST_PAD_LINK_NOFORMAT; } } /** * 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. * * The filtercaps will be copied and refcounted, so you should unref * it yourself after using this function. * * Returns: A result code indicating if the connection worked or * what went wrong. * * MT Safe. */ GstPadLinkReturn gst_pad_link_filtered (GstPad * srcpad, GstPad * sinkpad, const GstCaps * filtercaps) { GstRealPad *realsrc, *realsink; GstPadLinkReturn result; result = gst_pad_link_prepare_filtered (srcpad, sinkpad, &realsrc, &realsink, filtercaps); if (result != GST_PAD_LINK_OK) goto prepare_failed; GST_UNLOCK (realsink); GST_UNLOCK (realsrc); /* FIXME released the locks here, concurrent thread might link * something else. */ if (GST_RPAD_LINKFUNC (realsrc)) { /* this one will call the peer link function */ result = GST_RPAD_LINKFUNC (realsrc) (GST_PAD (realsrc), GST_PAD (realsink)); } else if (GST_RPAD_LINKFUNC (realsink)) { /* if no source link function, we need to call the sink link * function ourselves. */ result = GST_RPAD_LINKFUNC (realsink) (GST_PAD (realsink), GST_PAD (realsrc)); } else { result = GST_PAD_LINK_OK; } GST_LOCK (realsrc); GST_LOCK (realsink); if (result == GST_PAD_LINK_OK) { GST_RPAD_PEER (realsrc) = GST_REAL_PAD (realsink); GST_RPAD_PEER (realsink) = GST_REAL_PAD (realsrc); GST_UNLOCK (realsink); GST_UNLOCK (realsrc); /* fire off a signal to each of the pads telling them * that they've been linked */ g_signal_emit (G_OBJECT (realsrc), gst_real_pad_signals[REAL_LINKED], 0, realsink); g_signal_emit (G_OBJECT (realsink), gst_real_pad_signals[REAL_LINKED], 0, realsrc); GST_CAT_INFO (GST_CAT_PADS, "linked %s:%s and %s:%s, successful", GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink)); } else { GST_CAT_INFO (GST_CAT_PADS, "link between %s:%s and %s:%s failed", GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink)); /* remove the filter again */ if (filtercaps) { gst_caps_replace (&GST_RPAD_APPFILTER (realsrc), NULL); gst_caps_replace (&GST_RPAD_APPFILTER (realsink), NULL); } GST_UNLOCK (realsink); GST_UNLOCK (realsrc); } return result; prepare_failed: { return result; } } /** * gst_pad_link: * @srcpad: the source #GstPad to link. * @sinkpad: the sink #GstPad to link. * * Links the source pad to the sink pad. * * Returns: A result code indicating if the connection worked or * what went wrong. */ GstPadLinkReturn gst_pad_link (GstPad * srcpad, GstPad * sinkpad) { return gst_pad_link_filtered (srcpad, sinkpad, NULL); } static void gst_pad_set_pad_template (GstPad * pad, GstPadTemplate * templ) { /* this function would need checks if it weren't static */ GST_LOCK (pad); gst_object_replace ((GstObject **) & pad->padtemplate, (GstObject *) templ); GST_UNLOCK (pad); if (templ) { gst_object_sink (GST_OBJECT (templ)); g_signal_emit (G_OBJECT (templ), gst_pad_template_signals[TEMPL_PAD_CREATED], 0, pad); } } /** * gst_pad_get_pad_template: * @pad: a #GstPad. * * Gets the template for @pad. * * Returns: the #GstPadTemplate from which this pad was instantiated, or %NULL * if this pad has no template. */ GstPadTemplate * gst_pad_get_pad_template (GstPad * pad) { g_return_val_if_fail (GST_IS_PAD (pad), NULL); return GST_PAD_PAD_TEMPLATE (pad); } /** * gst_pad_get_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(). * Unref the object after use. * * Returns: the parent #GstElement. * * MT safe. */ GstElement * gst_pad_get_real_parent (GstPad * pad) { GstRealPad *realpad; GstElement *element; g_return_val_if_fail (GST_IS_PAD (pad), NULL); GST_PAD_REALIZE_AND_LOCK (pad, realpad, lost_ghostpad); element = GST_PAD_PARENT (realpad); if (element) gst_object_ref (GST_OBJECT (element)); GST_UNLOCK (realpad); return element; lost_ghostpad: { return NULL; } } /* FIXME not MT safe */ static void gst_pad_add_ghost_pad (GstPad * pad, GstPad * ghostpad) { GstRealPad *realpad; /* if we're ghosting a ghost pad, drill down to find the real pad */ realpad = (GstRealPad *) pad; while (GST_IS_GHOST_PAD (realpad)) realpad = GST_GPAD_REALPAD (realpad); g_return_if_fail (GST_IS_REAL_PAD (realpad)); /* will ref the pad template */ GST_GPAD_REALPAD (ghostpad) = realpad; realpad->ghostpads = g_list_prepend (realpad->ghostpads, ghostpad); gst_pad_set_pad_template (GST_PAD (ghostpad), GST_PAD_PAD_TEMPLATE (pad)); } static void gst_pad_remove_ghost_pad (GstPad * pad, GstPad * ghostpad) { GstRealPad *realpad; realpad = GST_PAD_REALIZE (pad); g_return_if_fail (GST_GPAD_REALPAD (ghostpad) == realpad); gst_pad_set_pad_template (GST_PAD (ghostpad), NULL); realpad->ghostpads = g_list_remove (realpad->ghostpads, ghostpad); GST_GPAD_REALPAD (ghostpad) = NULL; } /** * gst_pad_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 an error code is returned. * * Returns: The result code of the operation. * * MT safe */ GstPadLinkReturn gst_pad_relink_filtered (GstPad * srcpad, GstPad * sinkpad, const GstCaps * filtercaps) { GstRealPad *realsrc, *realsink; /* FIXME refactor and share code with link/unlink */ /* generic checks */ g_return_val_if_fail (GST_IS_PAD (srcpad), GST_PAD_LINK_REFUSED); g_return_val_if_fail (GST_IS_PAD (sinkpad), GST_PAD_LINK_REFUSED); GST_CAT_INFO (GST_CAT_PADS, "trying to relink %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 */ GST_PAD_REALIZE_AND_LOCK (srcpad, realsrc, lost_src_ghostpad); if (G_UNLIKELY (GST_RPAD_DIRECTION (realsrc) != GST_PAD_SRC)) goto not_srcpad; GST_PAD_REALIZE_AND_LOCK (sinkpad, realsink, lost_sink_ghostpad); if (G_UNLIKELY (GST_RPAD_DIRECTION (realsink) != GST_PAD_SINK)) goto not_sinkpad; if (G_UNLIKELY (GST_RPAD_PEER (realsink) != realsrc)) goto not_linked_together; if ((GST_PAD (realsrc) != srcpad) || (GST_PAD (realsink) != sinkpad)) { GST_CAT_INFO (GST_CAT_PADS, "*actually* relinking %s:%s and %s:%s", GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink)); } /* update filter */ if (filtercaps) { GstCaps *filtercopy; filtercopy = gst_caps_copy (filtercaps); filtercopy = gst_caps_ref (filtercopy); gst_caps_replace (&GST_PAD_APPFILTER (realsrc), filtercopy); gst_caps_replace (&GST_PAD_APPFILTER (realsink), filtercopy); } else { gst_caps_replace (&GST_PAD_APPFILTER (realsrc), NULL); gst_caps_replace (&GST_PAD_APPFILTER (realsink), NULL); } /* clear caps to force renegotiation */ gst_caps_replace (&GST_PAD_CAPS (realsrc), NULL); gst_caps_replace (&GST_PAD_CAPS (realsink), NULL); GST_UNLOCK (realsink); GST_UNLOCK (realsrc); GST_CAT_INFO (GST_CAT_PADS, "relinked %s:%s and %s:%s, successful", GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink)); return GST_PAD_LINK_OK; lost_src_ghostpad: { return GST_PAD_LINK_REFUSED; } not_srcpad: { g_critical ("pad %s is not a source pad", GST_PAD_NAME (realsrc)); GST_UNLOCK (realsrc); return GST_PAD_LINK_WRONG_DIRECTION; } lost_sink_ghostpad: { GST_DEBUG ("lost sink ghostpad"); GST_UNLOCK (realsrc); return GST_PAD_LINK_REFUSED; } not_sinkpad: { g_critical ("pad %s is not a sink pad", GST_PAD_NAME (realsink)); GST_UNLOCK (realsink); GST_UNLOCK (realsrc); return GST_PAD_LINK_WRONG_DIRECTION; } not_linked_together: { GST_CAT_INFO (GST_CAT_PADS, "src %s:%s was not linked with sink %s:%s", GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink)); /* we do not emit a warning in this case because unlinking cannot * be made MT safe.*/ GST_UNLOCK (realsink); GST_UNLOCK (realsrc); return GST_PAD_LINK_REFUSED; } } /* should be called with the pad LOCK held */ static GstCaps * gst_real_pad_get_caps_unlocked (GstRealPad * realpad) { GstCaps *result = NULL, *filter; GST_CAT_DEBUG (GST_CAT_CAPS, "get pad caps of %s:%s (%p)", GST_DEBUG_PAD_NAME (realpad), realpad); if (GST_RPAD_GETCAPSFUNC (realpad)) { GST_CAT_DEBUG (GST_CAT_CAPS, "dispatching to pad getcaps function"); GST_FLAG_SET (realpad, GST_PAD_IN_GETCAPS); GST_UNLOCK (realpad); result = GST_RPAD_GETCAPSFUNC (realpad) (GST_PAD (realpad)); GST_LOCK (realpad); GST_FLAG_UNSET (realpad, GST_PAD_IN_GETCAPS); if (result == NULL) { g_critical ("pad %s:%s returned NULL caps from getcaps function\n", GST_DEBUG_PAD_NAME (realpad)); } else { #ifndef G_DISABLE_ASSERT /* check that the returned caps are a real subset of the template caps */ if (GST_PAD_PAD_TEMPLATE (realpad)) { const GstCaps *templ_caps = GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (realpad)); if (!gst_caps_is_subset (result, templ_caps)) { GstCaps *temp; GST_CAT_ERROR_OBJECT (GST_CAT_CAPS, realpad, "pad returned caps %" GST_PTR_FORMAT " which are not a real subset of its template caps %" GST_PTR_FORMAT, result, templ_caps); g_warning ("pad %s:%s returned caps that are not a real subset of its template caps", GST_DEBUG_PAD_NAME (realpad)); temp = gst_caps_intersect (templ_caps, result); gst_caps_unref (result); result = temp; } } #endif goto done; } } if (GST_PAD_PAD_TEMPLATE (realpad)) { GstPadTemplate *templ = GST_PAD_PAD_TEMPLATE (realpad); result = GST_PAD_TEMPLATE_CAPS (templ); GST_CAT_DEBUG (GST_CAT_CAPS, "using pad template %p with caps %p %" GST_PTR_FORMAT, templ, result, result); result = gst_caps_ref (result); goto done; } if (GST_RPAD_CAPS (realpad)) { result = GST_RPAD_CAPS (realpad); GST_CAT_DEBUG (GST_CAT_CAPS, "using pad caps %p %" GST_PTR_FORMAT, result, result); result = gst_caps_ref (result); goto done; } GST_CAT_DEBUG (GST_CAT_CAPS, "pad has no caps"); result = gst_caps_new_empty (); done: filter = GST_RPAD_APPFILTER (realpad); if (filter) { GstCaps *temp = result; GST_CAT_DEBUG (GST_CAT_CAPS, "app filter %p %" GST_PTR_FORMAT, filter, filter); result = gst_caps_intersect (temp, filter); gst_caps_unref (temp); GST_CAT_DEBUG (GST_CAT_CAPS, "caps after intersection with app filter %p %" GST_PTR_FORMAT, result, result); } return result; } /** * 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_unref to get rid of it. * * MT safe. */ GstCaps * gst_pad_get_caps (GstPad * pad) { GstRealPad *realpad; GstCaps *result = NULL; g_return_val_if_fail (GST_IS_PAD (pad), NULL); /* now we need to deal with the real/ghost stuff */ GST_PAD_REALIZE_AND_LOCK (pad, realpad, lost_ghostpad); GST_CAT_DEBUG (GST_CAT_CAPS, "get pad caps of %s:%s (%p)", GST_DEBUG_PAD_NAME (realpad), realpad); if (G_UNLIKELY (GST_RPAD_IS_IN_GETCAPS (realpad))) goto was_dispatching; result = gst_real_pad_get_caps_unlocked (realpad); GST_UNLOCK (realpad); return result; lost_ghostpad: { return NULL; } was_dispatching: { GST_CAT_DEBUG (GST_CAT_CAPS, "pad %s:%s is already dispatching!", GST_DEBUG_PAD_NAME (realpad)); g_warning ("pad %s:%s recursively called getcaps!", GST_DEBUG_PAD_NAME (realpad)); GST_UNLOCK (realpad); return NULL; } } /** * gst_pad_peer_get_caps: * @pad: a #GstPad to get the peer capabilities of. * * Gets the capabilities of the peer connected to this pad. * * Returns: the #GstCaps of the peer pad. This function returns a new caps, so use * gst_caps_unref to get rid of it. */ GstCaps * gst_pad_peer_get_caps (GstPad * pad) { GstRealPad *realpad, *peerpad; GstCaps *result = NULL; g_return_val_if_fail (GST_IS_PAD (pad), NULL); /* now we need to deal with the real/ghost stuff */ GST_PAD_REALIZE_AND_LOCK (pad, realpad, lost_ghostpad); GST_CAT_DEBUG (GST_CAT_CAPS, "get peer caps of %s:%s (%p)", GST_DEBUG_PAD_NAME (realpad), realpad); peerpad = GST_RPAD_PEER (realpad); if (G_UNLIKELY (peerpad == NULL)) goto no_peer; if (G_UNLIKELY (GST_RPAD_IS_IN_GETCAPS (peerpad))) goto was_dispatching; gst_object_ref (GST_OBJECT (peerpad)); GST_UNLOCK (realpad); result = gst_pad_get_caps (GST_PAD_CAST (peerpad)); gst_object_unref (GST_OBJECT (peerpad)); return result; lost_ghostpad: { return NULL; } no_peer: { GST_UNLOCK (realpad); return gst_caps_new_any (); } was_dispatching: { GST_CAT_DEBUG (GST_CAT_CAPS, "pad %s:%s is already dispatching!", GST_DEBUG_PAD_NAME (realpad)); g_warning ("pad %s:%s recursively called getcaps!", GST_DEBUG_PAD_NAME (realpad)); GST_UNLOCK (realpad); return NULL; } } /** * gst_pad_fixate_caps: * @pad: a #GstPad to fixate * * Fixate a caps on the given pad. * * Returns: a fixated #GstCaps. */ GstCaps * gst_pad_fixate_caps (GstPad * pad, GstCaps * caps) { /* FIXME, implement me, call the fixate function for the pad */ return caps; } /** * gst_pad_accept_caps: * @pad: a #GstPad to check * * Check if the given pad accepts the caps. * * Returns: TRUE if the pad can accept the caps. */ gboolean gst_pad_accept_caps (GstPad * pad, GstCaps * caps) { GstRealPad *realpad; gboolean result; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); /* now we need to deal with the real/ghost stuff */ GST_PAD_REALIZE_AND_LOCK (pad, realpad, lost_ghostpad); GST_CAT_DEBUG (GST_CAT_CAPS, "pad accept caps of %s:%s (%p)", GST_DEBUG_PAD_NAME (realpad), realpad); /* FIXME, call accept function */ result = FALSE; GST_UNLOCK (realpad); return result; lost_ghostpad: { return FALSE; } } /** * gst_pad_peer_accept_caps: * @pad: a #GstPad to check * * Check if the given pad accepts the caps. * * Returns: TRUE if the pad can accept the caps. */ gboolean gst_pad_peer_accept_caps (GstPad * pad, GstCaps * caps) { GstRealPad *realpad, *peerpad; gboolean result; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); /* now we need to deal with the real/ghost stuff */ GST_PAD_REALIZE_AND_LOCK (pad, realpad, lost_ghostpad); GST_CAT_DEBUG (GST_CAT_CAPS, "peer accept caps of %s:%s (%p)", GST_DEBUG_PAD_NAME (realpad), realpad); peerpad = GST_RPAD_PEER (realpad); if (G_UNLIKELY (peerpad == NULL)) goto no_peer; result = gst_pad_accept_caps (GST_PAD_CAST (peerpad), caps); GST_UNLOCK (realpad); return result; lost_ghostpad: { return FALSE; } no_peer: { GST_UNLOCK (realpad); return TRUE; } } /** * gst_pad_set_caps: * @pad: a #GstPad to set the capabilities of. * @caps: a #GstCaps to set. * * Sets the capabilities of this pad. The caps must be fixed. Any previous * caps on the pad will be unreffed. This function refs the caps so you should * unref if as soon as you don't need it anymore. * It is possible to set NULL caps, which will make the pad unnegotiated * again. * * Returns: TRUE if the caps could be set. FALSE if the caps were not fixed * or bad parameters were provided to this function. * * MT safe. */ gboolean gst_pad_set_caps (GstPad * pad, GstCaps * caps) { GstPadSetCapsFunction setcaps; g_return_val_if_fail (GST_IS_REAL_PAD (pad), FALSE); GST_LOCK (pad); setcaps = GST_RPAD_SETCAPSFUNC (pad); /* call setcaps function to configure the pad */ if (setcaps != NULL) { if (!GST_RPAD_IS_IN_SETCAPS (pad)) { GST_FLAG_SET (pad, GST_PAD_IN_SETCAPS); GST_UNLOCK (pad); if (!setcaps (pad, caps)) goto could_not_set; GST_LOCK (pad); } else { GST_CAT_DEBUG (GST_CAT_CAPS, "pad %s:%s was dispatching", GST_DEBUG_PAD_NAME (pad)); } } if (GST_PAD_CAPS (pad)) gst_caps_unref (GST_PAD_CAPS (pad)); if (caps) caps = gst_caps_ref (caps); GST_PAD_CAPS (pad) = caps; GST_CAT_DEBUG (GST_CAT_CAPS, "%s:%s caps %" GST_PTR_FORMAT, GST_DEBUG_PAD_NAME (pad), caps); GST_UNLOCK (pad); g_object_notify (G_OBJECT (pad), "caps"); return TRUE; could_not_set: { GST_LOCK (pad); GST_FLAG_UNSET (pad, GST_PAD_IN_SETCAPS); GST_UNLOCK (pad); GST_CAT_DEBUG (GST_CAT_CAPS, "caps %" GST_PTR_FORMAT " could not be set", caps); return FALSE; } } static gboolean gst_pad_configure_sink (GstPad * pad, GstCaps * caps) { GstPadAcceptCapsFunction acceptcaps; GstPadSetCapsFunction setcaps; acceptcaps = GST_RPAD_ACCEPTCAPSFUNC (pad); setcaps = GST_RPAD_SETCAPSFUNC (pad); /* See if pad accepts the caps, by calling acceptcaps, only * needed if no setcaps function */ if (setcaps == NULL && acceptcaps != NULL) { if (!acceptcaps (pad, caps)) goto not_accepted; } /* set caps on pad if call succeeds */ gst_pad_set_caps (pad, caps); /* no need to unref the caps here, set_caps takes a ref and * our ref goes away when we leave this function. */ return TRUE; not_accepted: { GST_CAT_DEBUG (GST_CAT_CAPS, "caps %" GST_PTR_FORMAT " not accepted", caps); return FALSE; } } static gboolean gst_pad_configure_src (GstPad * pad, GstCaps * caps) { GstPadAcceptCapsFunction acceptcaps; GstPadSetCapsFunction setcaps; acceptcaps = GST_RPAD_ACCEPTCAPSFUNC (pad); setcaps = GST_RPAD_SETCAPSFUNC (pad); /* See if pad accepts the caps, by calling acceptcaps, only * needed if no setcaps function */ if (setcaps == NULL && acceptcaps != NULL) { if (!acceptcaps (pad, caps)) goto not_accepted; } /* set caps on pad if call succeeds */ gst_pad_set_caps (pad, caps); /* no need to unref the caps here, set_caps takes a ref and * our ref goes away when we leave this function. */ return TRUE; not_accepted: { GST_CAT_DEBUG (GST_CAT_CAPS, "caps %" GST_PTR_FORMAT " not accepted", caps); return FALSE; } } /** * gst_pad_get_pad_template_caps: * @pad: a #GstPad to get the template capabilities from. * * Gets the capabilities for @pad's template. * * Returns: the #GstCaps of this pad template. If you intend to keep a reference * on the caps, make a copy (see gst_caps_copy ()). */ const GstCaps * gst_pad_get_pad_template_caps (GstPad * pad) { static GstStaticCaps anycaps = GST_STATIC_CAPS ("ANY"); g_return_val_if_fail (GST_IS_PAD (pad), NULL); if (GST_PAD_PAD_TEMPLATE (pad)) return GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (pad)); return gst_static_caps_get (&anycaps); } /** * gst_pad_get_peer: * @pad: a #GstPad to get the peer of. * * Gets the peer of @pad. This function refs the peer pad so * you need to unref it after use. * * Returns: the peer #GstPad. Unref after usage. * * MT safe. */ GstPad * gst_pad_get_peer (GstPad * pad) { GstRealPad *realpad; GstRealPad *result; g_return_val_if_fail (GST_IS_PAD (pad), NULL); GST_PAD_REALIZE_AND_LOCK (pad, realpad, lost_ghostpad); result = GST_RPAD_PEER (realpad); if (result) gst_object_ref (GST_OBJECT (result)); GST_UNLOCK (realpad); return GST_PAD_CAST (result); lost_ghostpad: { return NULL; } } /** * gst_pad_realize: * @pad: a #GstPad to realize * * If the pad is a #GstRealPad, it is simply returned, else * the #GstGhostPad will be dereffed to the real pad. * * After this function you always receive the real pad of * the provided pad. * * This function unrefs the input pad and refs the result so * that you can write constructs like: * * pad = gst_pad_realize(pad) * * without having to unref the old pad. * * Returns: the real #GstPad or NULL when an old reference to a * ghostpad is used. * * MT safe. */ GstPad * gst_pad_realize (GstPad * pad) { GstRealPad *result; g_return_val_if_fail (GST_IS_PAD (pad), NULL); GST_LOCK (pad); result = GST_PAD_REALIZE (pad); if (result && pad != GST_PAD_CAST (result)) { gst_object_ref (GST_OBJECT (result)); GST_UNLOCK (pad); /* no other thread could dispose this since we * hold at least one ref */ gst_object_unref (GST_OBJECT (pad)); } else { GST_UNLOCK (pad); } return GST_PAD_CAST (result); } /** * gst_pad_get_allowed_caps: * @srcpad: a #GstPad, it must a a source pad. * * Gets the capabilities of the allowed media types that can flow through @pad * and its peer. The pad must be a source 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. This function returns NULL when the @pad has no * peer. * * MT safe. */ GstCaps * gst_pad_get_allowed_caps (GstPad * srcpad) { GstCaps *mycaps; GstCaps *caps; GstCaps *peercaps; GstRealPad *realpad, *peer; g_return_val_if_fail (GST_IS_PAD (srcpad), NULL); GST_PAD_REALIZE_AND_LOCK (srcpad, realpad, lost_ghostpad); /* FIXME, allow sinkpads too? need to use the nexted locking * with retry algorithm, see design docs */ if (G_UNLIKELY (!GST_PAD_IS_SRC (realpad))) goto not_src; if (G_UNLIKELY ((peer = GST_RPAD_PEER (realpad)) == NULL)) goto no_peer; GST_CAT_DEBUG (GST_CAT_PROPERTIES, "%s:%s: getting allowed caps", GST_DEBUG_PAD_NAME (realpad)); gst_object_ref (GST_OBJECT_CAST (peer)); GST_UNLOCK (realpad); mycaps = gst_pad_get_caps (GST_PAD_CAST (realpad)); peercaps = gst_pad_get_caps (GST_PAD_CAST (peer)); gst_object_unref (GST_OBJECT_CAST (peer)); caps = gst_caps_intersect (mycaps, peercaps); gst_caps_unref (peercaps); gst_caps_unref (mycaps); GST_CAT_DEBUG (GST_CAT_CAPS, "allowed caps %" GST_PTR_FORMAT, caps); return caps; lost_ghostpad: { GST_UNLOCK (srcpad); return NULL; } not_src: { GST_CAT_DEBUG (GST_CAT_PROPERTIES, "%s:%s: not a source pad", GST_DEBUG_PAD_NAME (realpad)); GST_UNLOCK (realpad); return NULL; } no_peer: { GST_CAT_DEBUG (GST_CAT_PROPERTIES, "%s:%s: no peer", GST_DEBUG_PAD_NAME (realpad)); GST_UNLOCK (realpad); return NULL; } } /** * gst_pad_get_negotiated_caps: * @pad: a #GstPad. * * Gets the capabilities of the media type that currently flows through @pad * and its peer. * * This function can be used on both src and sinkpads. Note that srcpads are * always negotiated before sinkpads so it is possible that the negotiated caps * on the srcpad do not match the negotiated caps of the peer. * * Returns: the negotiated #GstCaps of the pad link. Free the caps when * you no longer need it. This function returns NULL when the @pad has no * peer or is not negotiated yet. * * MT safe. */ GstCaps * gst_pad_get_negotiated_caps (GstPad * pad) { GstCaps *caps; GstRealPad *realpad, *peer; g_return_val_if_fail (GST_IS_PAD (pad), NULL); GST_PAD_REALIZE_AND_LOCK (pad, realpad, lost_ghostpad); if (G_UNLIKELY ((peer = GST_RPAD_PEER (realpad)) == NULL)) goto no_peer; GST_CAT_DEBUG (GST_CAT_PROPERTIES, "%s:%s: getting negotiated caps", GST_DEBUG_PAD_NAME (realpad)); caps = GST_RPAD_CAPS (realpad); if (caps) gst_caps_ref (caps); GST_UNLOCK (pad); GST_CAT_DEBUG (GST_CAT_CAPS, "negotiated caps %" GST_PTR_FORMAT, caps); return caps; lost_ghostpad: { GST_UNLOCK (pad); return NULL; } no_peer: { GST_CAT_DEBUG (GST_CAT_PROPERTIES, "%s:%s: no peer", GST_DEBUG_PAD_NAME (realpad)); GST_UNLOCK (realpad); return NULL; } } /** * gst_pad_get_filter_caps: * @pad: a real #GstPad. * * Gets the capabilities of filter that currently configured on @pad * and its peer. * * Returns: the filter #GstCaps of the pad link. Free the caps when * you no longer need it. This function returns NULL when the @pad has no * peer or there is no filter configured. * * MT safe. */ GstCaps * gst_pad_get_filter_caps (GstPad * pad) { GstCaps *caps; GstRealPad *realpad, *peer; g_return_val_if_fail (GST_IS_PAD (pad), NULL); GST_PAD_REALIZE_AND_LOCK (pad, realpad, lost_ghostpad); if (G_UNLIKELY ((peer = GST_RPAD_PEER (realpad)) == NULL)) goto no_peer; GST_CAT_DEBUG (GST_CAT_PROPERTIES, "%s:%s: getting filter caps", GST_DEBUG_PAD_NAME (realpad)); if ((caps = GST_RPAD_APPFILTER (realpad)) != NULL) gst_caps_ref (caps); GST_UNLOCK (pad); GST_CAT_DEBUG (GST_CAT_CAPS, "filter caps %" GST_PTR_FORMAT, caps); return caps; lost_ghostpad: { GST_UNLOCK (pad); return NULL; } no_peer: { GST_CAT_DEBUG (GST_CAT_PROPERTIES, "%s:%s: no peer", GST_DEBUG_PAD_NAME (realpad)); GST_UNLOCK (realpad); return NULL; } } /** * gst_pad_alloc_buffer: * @pad: a source #GstPad * @offset: the offset of the new buffer in the stream * @size: the size of the new buffer * @caps: the caps of the new buffer * * Allocates a new, empty buffer optimized to push to pad @pad. This * function only works if @pad is a source pad and a GST_REAL_PAD and * has a peer. * You need to check the caps of the buffer after performing this * function and renegotiate to the format if needed. * * Returns: a new, empty #GstBuffer, or NULL if wrong parameters * were provided or the peer pad is not able to provide a buffer * that can be handled by the caller. * * MT safe. */ GstBuffer * gst_pad_alloc_buffer (GstPad * pad, guint64 offset, gint size, GstCaps * caps) { GstRealPad *peer; GstBuffer *result = NULL; GstPadBufferAllocFunction bufferallocfunc; gboolean caps_changed; g_return_val_if_fail (GST_IS_REAL_PAD (pad), NULL); g_return_val_if_fail (GST_PAD_IS_SRC (pad), NULL); GST_LOCK (pad); if (G_UNLIKELY ((peer = GST_RPAD_PEER (pad)) == NULL)) goto no_peer; if (G_LIKELY ((bufferallocfunc = peer->bufferallocfunc) == NULL)) { GST_UNLOCK (pad); goto fallback; } gst_object_ref (GST_OBJECT_CAST (peer)); GST_UNLOCK (pad); GST_CAT_DEBUG (GST_CAT_PADS, "calling bufferallocfunc &%s (@%p) of peer pad %s:%s", GST_DEBUG_FUNCPTR_NAME (bufferallocfunc), &bufferallocfunc, GST_DEBUG_PAD_NAME (peer)); result = bufferallocfunc (GST_PAD_CAST (peer), offset, size, caps); gst_object_unref (GST_OBJECT_CAST (peer)); if (G_UNLIKELY (result == NULL)) { goto fallback; } /* FIXME, move capnego this into a base class? */ caps = GST_BUFFER_CAPS (result); caps_changed = caps && caps != GST_RPAD_CAPS (pad); /* we got a new datatype on the pad, see if it can handle it */ if (G_UNLIKELY (caps_changed)) { if (G_UNLIKELY (!gst_pad_configure_src (GST_PAD_CAST (pad), caps))) goto not_negotiated; } return result; no_peer: { /* pad has no peer */ GST_CAT_DEBUG (GST_CAT_PADS, "%s:%s called bufferallocfunc but had no peer, returning NULL", GST_DEBUG_PAD_NAME (pad)); GST_UNLOCK (pad); return NULL; } /* fallback case, allocate a buffer of our own, add pad caps. */ fallback: { result = gst_buffer_new_and_alloc (size); gst_buffer_set_caps (result, caps); return result; } not_negotiated: { GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "alloc function retured unacceptable buffer"); return NULL; } } static void gst_real_pad_dispose (GObject * object) { GstPad *pad = GST_PAD (object); /* No linked pad can ever be disposed. * It has to have a parent to be linked * and a parent would hold a reference */ /* FIXME: what about if g_object_dispose is explicitly called on the pad? Is that legal? otherwise we could assert GST_OBJECT_PARENT (pad) == NULL as well... */ g_assert (GST_PAD_PEER (pad) == NULL); GST_CAT_DEBUG (GST_CAT_REFCOUNTING, "dispose %s:%s", GST_DEBUG_PAD_NAME (pad)); /* we destroy the ghostpads, because they are nothing without the real pad */ if (GST_REAL_PAD (pad)->ghostpads) { GList *orig, *ghostpads; orig = ghostpads = g_list_copy (GST_REAL_PAD (pad)->ghostpads); while (ghostpads) { GstPad *ghostpad = GST_PAD (ghostpads->data); if (GST_IS_ELEMENT (GST_OBJECT_PARENT (ghostpad))) { GstElement *parent = GST_ELEMENT (GST_OBJECT_PARENT (ghostpad)); GST_CAT_DEBUG (GST_CAT_REFCOUNTING, "removing ghost pad from element '%s'", GST_OBJECT_NAME (parent)); gst_element_remove_pad (parent, ghostpad); } else { /* handle the case where we have some floating ghost pad that was never added to an element */ g_object_set (ghostpad, "real-pad", NULL, NULL); } ghostpads = g_list_next (ghostpads); } g_list_free (orig); /* as the ghost pads are removed, they remove themselves from ->ghostpads. So it should be empty now. Let's assert that. */ g_assert (GST_REAL_PAD (pad)->ghostpads == NULL); } /* clear the caps */ gst_caps_replace (&GST_RPAD_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; gchar *name = NULL; while (field) { if (!strcmp (field->name, "name")) { name = xmlNodeGetContent (field); pad = gst_element_get_pad (GST_ELEMENT (parent), name); g_free (name); } 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)); g_free (peer); return; } g_free (peer); 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; } /** * 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 */ /* * should be called with pad lock held * * MT safe. */ static void handle_pad_block (GstRealPad * pad) { GstPadBlockCallback callback; gpointer user_data; GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "signal block taken on pad %s:%s", GST_DEBUG_PAD_NAME (pad)); /* need to grab extra ref for the callbacks */ gst_object_ref (GST_OBJECT (pad)); callback = pad->block_callback; if (callback) { user_data = pad->block_data; GST_UNLOCK (pad); callback (GST_PAD_CAST (pad), TRUE, user_data); GST_LOCK (pad); } else { GST_PAD_BLOCK_SIGNAL (pad); } while (GST_RPAD_IS_BLOCKED (pad)) GST_PAD_BLOCK_WAIT (pad); GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "got unblocked"); callback = pad->block_callback; if (callback) { user_data = pad->block_data; GST_UNLOCK (pad); callback (GST_PAD_CAST (pad), FALSE, user_data); GST_LOCK (pad); } else { GST_PAD_BLOCK_SIGNAL (pad); } gst_object_unref (GST_OBJECT (pad)); } /** * gst_pad_push: * @pad: a source #GstPad. * @buffer: the #GstBuffer to push. * * Pushes a buffer to the peer of @pad. @pad must be linked. * * Returns: a #GstFlowReturn from the peer pad. * * MT safe. */ GstFlowReturn gst_pad_push (GstPad * pad, GstBuffer * buffer) { GstRealPad *peer; GstFlowReturn ret; GstPadChainFunction chainfunc; GstCaps *caps; gboolean caps_changed; g_return_val_if_fail (GST_IS_REAL_PAD (pad), GST_FLOW_ERROR); g_return_val_if_fail (GST_RPAD_DIRECTION (pad) == GST_PAD_SRC, GST_FLOW_ERROR); g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR); g_return_val_if_fail (GST_IS_BUFFER (buffer), GST_FLOW_ERROR); GST_LOCK (pad); while (G_UNLIKELY (GST_RPAD_IS_BLOCKED (pad))) handle_pad_block (GST_REAL_PAD_CAST (pad)); if (G_UNLIKELY ((peer = GST_RPAD_PEER (pad)) == NULL)) goto not_linked; if (G_UNLIKELY (!GST_RPAD_IS_ACTIVE (peer))) goto not_active; if (G_UNLIKELY (GST_RPAD_IS_FLUSHING (peer))) goto flushing; gst_object_ref (GST_OBJECT_CAST (peer)); GST_UNLOCK (pad); /* FIXME, move capnego this into a base class? */ caps = GST_BUFFER_CAPS (buffer); caps_changed = caps && caps != GST_RPAD_CAPS (peer); /* we got a new datatype on the peer pad, see if it can handle it */ if (G_UNLIKELY (caps_changed)) { if (G_UNLIKELY (!gst_pad_configure_sink (GST_PAD_CAST (peer), caps))) goto not_negotiated; } /* NOTE: we read the peer chainfunc unlocked. * we cannot hold the lock for the peer so we might send * the data to the wrong function. This is not really a * problem since functions are assigned at creation time * and don't change that often... */ if (G_UNLIKELY ((chainfunc = peer->chainfunc) == NULL)) goto no_function; GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "calling chainfunction &%s of peer pad %s:%s", GST_DEBUG_FUNCPTR_NAME (chainfunc), GST_DEBUG_PAD_NAME (peer)); ret = chainfunc (GST_PAD_CAST (peer), buffer); gst_object_unref (GST_OBJECT_CAST (peer)); return ret; /* ERROR recovery here */ not_linked: { GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "pushing, but it was not linked"); GST_UNLOCK_RETURN (pad, GST_FLOW_NOT_CONNECTED); } not_active: { GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "pushing, but it was inactive"); GST_UNLOCK_RETURN (pad, GST_FLOW_WRONG_STATE); } flushing: { GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "pushing, but pad was flushing"); GST_UNLOCK_RETURN (pad, GST_FLOW_UNEXPECTED); } not_negotiated: { GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "pushing buffer but peer did not accept"); return GST_FLOW_NOT_NEGOTIATED; } no_function: { GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "pushing, but not chainhandler"); GST_ELEMENT_ERROR (GST_PAD_PARENT (pad), CORE, PAD, (NULL), ("push on pad %s:%s but the peer pad %s:%s has no chainfunction", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_PAD_NAME (peer))); gst_object_unref (GST_OBJECT (peer)); return GST_FLOW_ERROR; } } /** * gst_pad_pull_range: * @pad: a sink #GstPad. * @buffer: a pointer to hold the #GstBuffer. * @offset: The start offset of the buffer * @length: The length of the buffer * * Pulls a buffer from the peer pad. @pad must be linked. * * Returns: a #GstFlowReturn from the peer pad. * * MT safe. */ GstFlowReturn gst_pad_pull_range (GstPad * pad, guint64 offset, guint size, GstBuffer ** buffer) { GstRealPad *peer; GstFlowReturn ret; GstPadGetRangeFunction getrangefunc; g_return_val_if_fail (GST_IS_REAL_PAD (pad), GST_FLOW_ERROR); g_return_val_if_fail (GST_RPAD_DIRECTION (pad) == GST_PAD_SINK, GST_FLOW_ERROR); g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR); GST_LOCK (pad); while (G_UNLIKELY (GST_RPAD_IS_BLOCKED (pad))) handle_pad_block (GST_REAL_PAD_CAST (pad)); if (G_UNLIKELY ((peer = GST_RPAD_PEER (pad)) == NULL)) goto not_connected; gst_object_ref (GST_OBJECT_CAST (peer)); GST_UNLOCK (pad); /* see note in above function */ if (G_UNLIKELY ((getrangefunc = peer->getrangefunc) == NULL)) goto no_function; GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "calling getrangefunc %s of peer pad %s:%s", GST_DEBUG_FUNCPTR_NAME (getrangefunc), GST_DEBUG_PAD_NAME (peer)); ret = getrangefunc (GST_PAD_CAST (peer), offset, size, buffer); gst_object_unref (GST_OBJECT_CAST (peer)); return ret; /* ERROR recovery here */ not_connected: { GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "pulling range, but it was not linked"); GST_UNLOCK_RETURN (pad, GST_FLOW_NOT_CONNECTED); } no_function: { GST_ELEMENT_ERROR (GST_PAD_PARENT (pad), CORE, PAD, (NULL), ("pullrange on pad %s:%s but the peer pad %s:%s has no getrangefunction", GST_DEBUG_PAD_NAME (pad), GST_DEBUG_PAD_NAME (peer))); gst_object_unref (GST_OBJECT (peer)); return GST_FLOW_ERROR; } } /************************************************************************ * * templates * */ static void gst_pad_template_class_init (GstPadTemplateClass * klass); static void gst_pad_template_init (GstPadTemplate * templ); static void gst_pad_template_dispose (GObject * object); GType gst_pad_template_get_type (void) { static GType padtemplate_type = 0; if (!padtemplate_type) { static const GTypeInfo padtemplate_info = { sizeof (GstPadTemplateClass), NULL, NULL, (GClassInitFunc) gst_pad_template_class_init, NULL, NULL, sizeof (GstPadTemplate), 0, (GInstanceInitFunc) gst_pad_template_init, NULL }; padtemplate_type = g_type_register_static (GST_TYPE_OBJECT, "GstPadTemplate", &padtemplate_info, 0); } return padtemplate_type; } static void gst_pad_template_class_init (GstPadTemplateClass * klass) { GObjectClass *gobject_class; GstObjectClass *gstobject_class; gobject_class = (GObjectClass *) klass; gstobject_class = (GstObjectClass *) klass; padtemplate_parent_class = g_type_class_ref (GST_TYPE_OBJECT); gst_pad_template_signals[TEMPL_PAD_CREATED] = g_signal_new ("pad-created", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstPadTemplateClass, pad_created), NULL, NULL, gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD); gobject_class->dispose = gst_pad_template_dispose; gstobject_class->path_string_separator = "*"; } static void gst_pad_template_init (GstPadTemplate * templ) { } static void gst_pad_template_dispose (GObject * object) { GstPadTemplate *templ = GST_PAD_TEMPLATE (object); g_free (GST_PAD_TEMPLATE_NAME_TEMPLATE (templ)); if (GST_PAD_TEMPLATE_CAPS (templ)) { gst_caps_unref (GST_PAD_TEMPLATE_CAPS (templ)); } G_OBJECT_CLASS (padtemplate_parent_class)->dispose (object); } /* ALWAYS padtemplates cannot have conversion specifications, it doesn't make * sense. * SOMETIMES padtemplates can do whatever they want, they are provided by the * element. * REQUEST padtemplates can be reverse-parsed (the user asks for 'sink1', the * 'sink%d' template is automatically selected), so we need to restrict their * naming. */ static gboolean name_is_valid (const gchar * name, GstPadPresence presence) { const gchar *str; if (presence == GST_PAD_ALWAYS) { if (strchr (name, '%')) { g_warning ("invalid name template %s: conversion specifications are not" " allowed for GST_PAD_ALWAYS padtemplates", name); return FALSE; } } else if (presence == GST_PAD_REQUEST) { if ((str = strchr (name, '%')) && strchr (str + 1, '%')) { g_warning ("invalid name template %s: only one conversion specification" " allowed in GST_PAD_REQUEST padtemplate", name); return FALSE; } if (str && (*(str + 1) != 's' && *(str + 1) != 'd')) { g_warning ("invalid name template %s: conversion specification must be of" " type '%%d' or '%%s' for GST_PAD_REQUEST padtemplate", name); return FALSE; } if (str && (*(str + 2) != '\0')) { g_warning ("invalid name template %s: conversion specification must" " appear at the end of the GST_PAD_REQUEST padtemplate name", name); return FALSE; } } return TRUE; } /** * gst_static_pad_template_get: * @pad_template: the static pad template * * Converts a #GstStaticPadTemplate into a #GstPadTemplate. * * Returns: a new #GstPadTemplate. */ GstPadTemplate * gst_static_pad_template_get (GstStaticPadTemplate * pad_template) { GstPadTemplate *new; if (!name_is_valid (pad_template->name_template, pad_template->presence)) return NULL; new = g_object_new (gst_pad_template_get_type (), "name", pad_template->name_template, NULL); GST_PAD_TEMPLATE_NAME_TEMPLATE (new) = g_strdup (pad_template->name_template); GST_PAD_TEMPLATE_DIRECTION (new) = pad_template->direction; GST_PAD_TEMPLATE_PRESENCE (new) = pad_template->presence; GST_PAD_TEMPLATE_CAPS (new) = gst_caps_copy (gst_static_caps_get (&pad_template->static_caps)); return new; } /** * gst_pad_template_new: * @name_template: the name template. * @direction: the #GstPadDirection of the template. * @presence: the #GstPadPresence of the pad. * @caps: a #GstCaps set for the template. The caps are taken ownership of. * * Creates a new pad template with a name according to the given template * and with the given arguments. This functions takes ownership of the provided * caps, so be sure to not use them afterwards. * * Returns: a new #GstPadTemplate. */ GstPadTemplate * gst_pad_template_new (const gchar * name_template, GstPadDirection direction, GstPadPresence presence, GstCaps * caps) { GstPadTemplate *new; g_return_val_if_fail (name_template != NULL, NULL); g_return_val_if_fail (caps != NULL, NULL); g_return_val_if_fail (direction == GST_PAD_SRC || direction == GST_PAD_SINK, NULL); g_return_val_if_fail (presence == GST_PAD_ALWAYS || presence == GST_PAD_SOMETIMES || presence == GST_PAD_REQUEST, 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. If you need to keep a reference to * the caps, make a copy (see gst_caps_copy ()). */ const GstCaps * gst_pad_template_get_caps (GstPadTemplate * templ) { g_return_val_if_fail (GST_IS_PAD_TEMPLATE (templ), NULL); return GST_PAD_TEMPLATE_CAPS (templ); } /** * gst_pad_set_element_private: * @pad: the #GstPad to set the private data of. * @priv: The private data to attach to the pad. * * Set the given private data gpointer on the pad. * This function can only be used by the element that owns the pad. */ void gst_pad_set_element_private (GstPad * pad, gpointer priv) { pad->element_private = priv; } /** * gst_pad_get_element_private: * @pad: the #GstPad to get the private data of. * * Gets the private data of a pad. * * Returns: a #gpointer to the private data. */ gpointer gst_pad_get_element_private (GstPad * pad) { return pad->element_private; } /***** ghost pads *****/ GType _gst_ghost_pad_type = 0; static void gst_ghost_pad_class_init (GstGhostPadClass * klass); static void gst_ghost_pad_init (GstGhostPad * pad); static void gst_ghost_pad_dispose (GObject * object); static void gst_ghost_pad_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static void gst_ghost_pad_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static GstPad *ghost_pad_parent_class = NULL; /* static guint gst_ghost_pad_signals[LAST_SIGNAL] = { 0 }; */ enum { GPAD_ARG_0, GPAD_ARG_REAL_PAD /* fill me */ }; GType gst_ghost_pad_get_type (void) { if (!_gst_ghost_pad_type) { static const GTypeInfo pad_info = { sizeof (GstGhostPadClass), NULL, NULL, (GClassInitFunc) gst_ghost_pad_class_init, NULL, NULL, sizeof (GstGhostPad), 0, (GInstanceInitFunc) gst_ghost_pad_init, NULL }; _gst_ghost_pad_type = g_type_register_static (GST_TYPE_PAD, "GstGhostPad", &pad_info, 0); } return _gst_ghost_pad_type; } static void gst_ghost_pad_class_init (GstGhostPadClass * klass) { GObjectClass *gobject_class; gobject_class = (GObjectClass *) klass; ghost_pad_parent_class = g_type_class_ref (GST_TYPE_PAD); gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_ghost_pad_dispose); gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_ghost_pad_set_property); gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_ghost_pad_get_property); g_object_class_install_property (gobject_class, GPAD_ARG_REAL_PAD, g_param_spec_object ("real-pad", "Real pad", "The real pad for the ghost pad", GST_TYPE_PAD, G_PARAM_READWRITE)); } static void gst_ghost_pad_init (GstGhostPad * pad) { /* zeroed by glib */ } static void gst_ghost_pad_dispose (GObject * object) { g_object_set (object, "real-pad", NULL, NULL); G_OBJECT_CLASS (ghost_pad_parent_class)->dispose (object); } static void gst_ghost_pad_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstPad *ghostpad = (GstPad *) object; GstPad *oldrealpad = (GstPad *) GST_GPAD_REALPAD (ghostpad); GstPad *realpad = NULL; switch (prop_id) { case GPAD_ARG_REAL_PAD: realpad = g_value_get_object (value); if (oldrealpad) { if (realpad == oldrealpad) return; else gst_pad_remove_ghost_pad (oldrealpad, ghostpad); } if (realpad) gst_pad_add_ghost_pad (realpad, ghostpad); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_ghost_pad_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { switch (prop_id) { case GPAD_ARG_REAL_PAD: g_value_set_object (value, GST_GPAD_REALPAD (object)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } /** * gst_ghost_pad_new: * @name: the name of the new ghost pad. * @pad: the #GstPad to create a ghost pad for. * * Creates a new ghost pad associated with @pad, and named @name. If @name is * %NULL, a guaranteed unique name (across all ghost pads) will be assigned. * * Returns: a new ghost #GstPad, or %NULL in case of an error. */ GstPad * gst_ghost_pad_new (const gchar * name, GstPad * pad) { GstPad *gpad; g_return_val_if_fail (GST_IS_PAD (pad), NULL); gpad = g_object_new (GST_TYPE_GHOST_PAD, "name", name, "real-pad", pad, NULL); GST_CAT_DEBUG (GST_CAT_PADS, "created ghost pad \"%s\" for pad %s:%s", GST_OBJECT_NAME (gpad), GST_DEBUG_PAD_NAME (pad)); return gpad; } /** * gst_pad_get_internal_links_default: * @pad: the #GstPad to get the internal links of. * * Gets a list of pads to which the given pad is linked to * inside of the parent element. * This is the default handler, and thus returns a list of all of the * pads inside the parent element with opposite direction. * The caller must free this list after use. * * Returns: a newly allocated #GList of pads. */ GList * gst_pad_get_internal_links_default (GstPad * pad) { GList *res = NULL; GstElement *parent; GList *parent_pads; GstPadDirection direction; GstRealPad *rpad; g_return_val_if_fail (GST_IS_PAD (pad), NULL); rpad = GST_PAD_REALIZE (pad); direction = rpad->direction; parent = GST_PAD_PARENT (rpad); parent_pads = parent->pads; while (parent_pads) { GstRealPad *parent_pad = GST_PAD_REALIZE (parent_pads->data); if (parent_pad->direction != direction) { res = g_list_prepend (res, parent_pad); } parent_pads = g_list_next (parent_pads); } return res; } /** * gst_pad_get_internal_links: * @pad: the #GstPad to get the internal links of. * * Gets a list of pads to which the given pad is linked to * inside of the parent element. * The caller must free this list after use. * * Returns: a newly allocated #GList of pads. */ GList * gst_pad_get_internal_links (GstPad * pad) { GList *res = NULL; GstRealPad *rpad; g_return_val_if_fail (GST_IS_PAD (pad), NULL); rpad = GST_PAD_REALIZE (pad); if (GST_RPAD_INTLINKFUNC (rpad)) res = GST_RPAD_INTLINKFUNC (rpad) (GST_PAD_CAST (rpad)); return res; } static gboolean gst_pad_event_default_dispatch (GstPad * pad, GstEvent * event) { GList *orig, *pads; gboolean result; GST_INFO_OBJECT (pad, "Sending event %p to all internally linked pads", event); result = (GST_PAD_DIRECTION (pad) == GST_PAD_SINK); orig = pads = gst_pad_get_internal_links (pad); while (pads) { GstPad *eventpad = GST_PAD (pads->data); pads = g_list_next (pads); /* for all of the internally-linked pads that are actually linked */ if (GST_PAD_IS_LINKED (eventpad)) { if (GST_PAD_DIRECTION (eventpad) == GST_PAD_SRC) { /* for each pad we send to, we should ref the event; it's up * to downstream to unref again when handled. */ GST_LOG_OBJECT (pad, "Reffing and sending event %p to %s:%s", event, GST_DEBUG_PAD_NAME (eventpad)); gst_event_ref (event); gst_pad_push_event (eventpad, event); } else { /* we only send the event on one pad, multi-sinkpad elements * should implement a handler */ GST_LOG_OBJECT (pad, "sending event %p to one sink pad %s:%s", event, GST_DEBUG_PAD_NAME (eventpad)); result = gst_pad_push_event (eventpad, event); goto done; } } } /* we handled the incoming event so we unref once */ GST_LOG_OBJECT (pad, "handled event %p, unreffing", event); gst_event_unref (event); done: g_list_free (orig); return result; } /** * gst_pad_event_default: * @pad: a #GstPad to call the default event handler on. * @event: the #GstEvent to handle. * * Invokes the default event handler for the given pad. End-of-stream and * discontinuity events are handled specially, and then the event is sent to all * pads internally linked to @pad. Note that if there are many possible sink * pads that are internally linked to @pad, only one will be sent an event. * Multi-sinkpad elements should implement custom event handlers. * * Returns: TRUE if the event was sent succesfully. */ gboolean gst_pad_event_default (GstPad * pad, GstEvent * event) { g_return_val_if_fail (GST_IS_PAD (pad), FALSE); g_return_val_if_fail (event != NULL, FALSE); return gst_pad_event_default_dispatch (pad, event); } /** * gst_pad_dispatcher: * @pad: a #GstPad to dispatch. * @dispatch: the #GstDispatcherFunction to call. * @data: gpointer user data passed to the dispatcher function. * * Invokes the given dispatcher function on all pads that are * internally linked to the given pad. * The GstPadDispatcherFunction should return TRUE when no further pads * need to be processed. * * Returns: TRUE if one of the dispatcher functions returned TRUE. */ gboolean gst_pad_dispatcher (GstPad * pad, GstPadDispatcherFunction dispatch, gpointer data) { gboolean res = FALSE; GList *int_pads, *orig; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); g_return_val_if_fail (dispatch != NULL, FALSE); orig = int_pads = gst_pad_get_internal_links (pad); while (int_pads) { GstRealPad *int_rpad = GST_PAD_REALIZE (int_pads->data); GstRealPad *int_peer = GST_RPAD_PEER (int_rpad); if (int_peer) { res = dispatch (GST_PAD (int_peer), data); if (res) break; } int_pads = g_list_next (int_pads); } g_list_free (orig); return res; } /** * gst_pad_push_event: * @pad: a #GstPad to push the event to. * @event: the #GstEvent to send to the pad. * * Sends the event to the peer of the given pad. * * Returns: TRUE if the event was handled. * * MT safe. */ gboolean gst_pad_push_event (GstPad * pad, GstEvent * event) { GstRealPad *peerpad; gboolean result; g_return_val_if_fail (GST_IS_REAL_PAD (pad), FALSE); g_return_val_if_fail (event != NULL, FALSE); GST_LOCK (pad); peerpad = GST_RPAD_PEER (pad); if (peerpad == NULL) goto not_linked; gst_object_ref (GST_OBJECT_CAST (peerpad)); GST_UNLOCK (pad); result = gst_pad_send_event (GST_PAD_CAST (peerpad), event); gst_object_unref (GST_OBJECT_CAST (peerpad)); return result; /* ERROR handling */ not_linked: { GST_UNLOCK (pad); return FALSE; } } /** * 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. This function can be used * by applications to send events in the pipeline. * * Returns: TRUE if the event was handled. */ gboolean gst_pad_send_event (GstPad * pad, GstEvent * event) { gboolean result = FALSE; GstRealPad *rpad; GstPadEventFunction eventfunc; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); g_return_val_if_fail (event != NULL, FALSE); rpad = GST_PAD_REALIZE (pad); if (GST_EVENT_SRC (event) == NULL) GST_EVENT_SRC (event) = gst_object_ref (GST_OBJECT (rpad)); GST_CAT_DEBUG (GST_CAT_EVENT, "have event type %d on pad %s:%s", GST_EVENT_TYPE (event), GST_DEBUG_PAD_NAME (rpad)); if (GST_PAD_IS_SINK (pad)) { if (GST_EVENT_TYPE (event) == GST_EVENT_FLUSH) { GST_CAT_DEBUG (GST_CAT_EVENT, "have flush event"); GST_LOCK (pad); if (GST_EVENT_FLUSH_DONE (event)) { GST_CAT_DEBUG (GST_CAT_EVENT, "clear flush flag"); GST_FLAG_UNSET (pad, GST_PAD_FLUSHING); } else { GST_CAT_DEBUG (GST_CAT_EVENT, "set flush flag"); GST_FLAG_SET (pad, GST_PAD_FLUSHING); } GST_UNLOCK (pad); } } if ((eventfunc = GST_RPAD_EVENTFUNC (rpad)) == NULL) goto no_function; result = eventfunc (GST_PAD_CAST (rpad), event); return result; /* ERROR handling */ no_function: { g_warning ("pad %s:%s has no event handler, file a bug.", GST_DEBUG_PAD_NAME (rpad)); gst_event_unref (event); return FALSE; } } typedef struct { GstFormat src_format; gint64 src_value; GstFormat *dest_format; gint64 *dest_value; } GstPadConvertData; static gboolean gst_pad_convert_dispatcher (GstPad * pad, GstPadConvertData * data) { return gst_pad_convert (pad, data->src_format, data->src_value, data->dest_format, data->dest_value); } /** * gst_pad_convert_default: * @pad: a #GstPad to invoke the default converter on. * @src_format: the source #GstFormat. * @src_value: the source value. * @dest_format: a pointer to the destination #GstFormat. * @dest_value: a pointer to the destination value. * * Invokes the default converter on a pad. * This will forward the call to the pad obtained * using the internal link of * the element. * * Returns: TRUE if the conversion could be performed. */ gboolean gst_pad_convert_default (GstPad * pad, GstFormat src_format, gint64 src_value, GstFormat * dest_format, gint64 * dest_value) { GstPadConvertData data; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); g_return_val_if_fail (dest_format != NULL, FALSE); g_return_val_if_fail (dest_value != NULL, FALSE); data.src_format = src_format; data.src_value = src_value; data.dest_format = dest_format; data.dest_value = dest_value; return gst_pad_dispatcher (pad, (GstPadDispatcherFunction) gst_pad_convert_dispatcher, &data); } /** * gst_pad_convert: * @pad: a #GstPad to invoke the default converter on. * @src_format: the source #GstFormat. * @src_value: the source value. * @dest_format: a pointer to the destination #GstFormat. * @dest_value: a pointer to the destination value. * * Invokes a conversion on the pad. * * Returns: TRUE if the conversion could be performed. */ gboolean gst_pad_convert (GstPad * pad, GstFormat src_format, gint64 src_value, GstFormat * dest_format, gint64 * dest_value) { GstRealPad *rpad; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); g_return_val_if_fail (dest_format != NULL, FALSE); g_return_val_if_fail (dest_value != NULL, FALSE); if (src_format == *dest_format) { *dest_value = src_value; return TRUE; } rpad = GST_PAD_REALIZE (pad); if (GST_RPAD_CONVERTFUNC (rpad)) { return GST_RPAD_CONVERTFUNC (rpad) (GST_PAD (rpad), src_format, src_value, dest_format, dest_value); } return FALSE; } typedef struct { GstQueryType type; GstFormat *format; gint64 *value; } GstPadQueryData; static gboolean gst_pad_query_dispatcher (GstPad * pad, GstPadQueryData * data) { return gst_pad_query (pad, data->type, data->format, data->value); } /** * gst_pad_query_default: * @pad: a #GstPad to invoke the default query on. * @type: the #GstQueryType of the query to perform. * @format: a pointer to the #GstFormat of the result. * @value: a pointer to the result. * * Invokes the default query function on a pad. * * Returns: TRUE if the query could be performed. */ gboolean gst_pad_query_default (GstPad * pad, GstQueryType type, GstFormat * format, gint64 * value) { GstPadQueryData data; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); g_return_val_if_fail (format != NULL, FALSE); g_return_val_if_fail (value != NULL, FALSE); data.type = type; data.format = format; data.value = value; return gst_pad_dispatcher (pad, (GstPadDispatcherFunction) gst_pad_query_dispatcher, &data); } /** * gst_pad_query: * @pad: a #GstPad to invoke the default query on. * @type: the #GstQueryType of the query to perform. * @format: a pointer to the #GstFormat asked for. * On return contains the #GstFormat used. * @value: a pointer to the result. * * Queries a pad for one of the available properties. The format will be * adjusted to the actual format used when specifying formats such as * GST_FORMAT_DEFAULT. * FIXME: Tell if the format can be adjusted when specifying a definite format. * * Returns: TRUE if the query could be performed. */ gboolean gst_pad_query (GstPad * pad, GstQueryType type, GstFormat * format, gint64 * value) { GstRealPad *rpad; g_return_val_if_fail (GST_IS_PAD (pad), FALSE); g_return_val_if_fail (format != NULL, FALSE); g_return_val_if_fail (value != NULL, FALSE); rpad = GST_PAD_REALIZE (pad); g_return_val_if_fail (rpad, FALSE); if (GST_RPAD_QUERYFUNC (rpad)) return GST_RPAD_QUERYFUNC (rpad) (GST_PAD (pad), type, format, value); return FALSE; } static gboolean gst_pad_get_formats_dispatcher (GstPad * pad, const GstFormat ** data) { *data = gst_pad_get_formats (pad); return TRUE; } /** * gst_pad_get_formats_default: * @pad: a #GstPad to query * * Invoke the default format dispatcher for the pad. * * Returns: An array of GstFormats ended with a 0 value. */ const GstFormat * gst_pad_get_formats_default (GstPad * pad) { GstFormat *result = NULL; g_return_val_if_fail (GST_IS_PAD (pad), NULL); gst_pad_dispatcher (pad, (GstPadDispatcherFunction) gst_pad_get_formats_dispatcher, &result); return result; } /** * gst_pad_get_formats: * @pad: a #GstPad to query * * Gets the list of supported formats from the pad. * * Returns: An array of GstFormats ended with a 0 value. */ const GstFormat * gst_pad_get_formats (GstPad * pad) { GstRealPad *rpad; g_return_val_if_fail (GST_IS_PAD (pad), NULL); rpad = GST_PAD_REALIZE (pad); if (GST_RPAD_FORMATSFUNC (rpad)) return GST_RPAD_FORMATSFUNC (rpad) (GST_PAD (pad)); return NULL; }