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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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429ebfff2c
Original commit message from CVS: * docs/gst/gstreamer-sections.txt: * gst/gstbin.c: (bin_bus_handler), (gst_bin_handle_message_func): * gst/gstbin.h: * gst/gstbus.c: (gst_bus_class_init): * gst/gstbus.h: * gst/gstclock.c: * gst/gstelement.c: (gst_element_set_locked_state): * gst/gstsegment.c: Documentation updates. * gst/gstpipeline.c: (gst_pipeline_get_type), (gst_pipeline_class_init), (gst_pipeline_init), (gst_pipeline_dispose), (gst_pipeline_set_property), (gst_pipeline_get_property), (do_pipeline_seek), (gst_pipeline_send_event), (gst_pipeline_change_state), (gst_pipeline_provide_clock_func), (gst_pipeline_set_delay), (gst_pipeline_get_delay): * gst/gstpipeline.h: Added methods for setting the delay. API: gst_pipeline_set_delay API: gst_pipeline_get_delay Add pipeline debug category Various cleanups. Updated docs. Don't reset stream time when seek failed.
2671 lines
74 KiB
C
2671 lines
74 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2004 Wim Taymans <wim@fluendo.com>
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*
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* gstelement.c: The base element, all elements derive from this
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:gstelement
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* @short_description: Abstract base class for all pipeline elements
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* @see_also: #GstElementFactory, #GstPad
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*
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* GstElement is the abstract base class needed to construct an element that
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* can be used in a GStreamer pipeline. Please refer to the plugin writers
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* guide for more information on creating #GstElement subclasses.
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*
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* The name of a #GstElement can be get with gst_element_get_name() and set with
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* gst_element_set_name(). For speed, GST_ELEMENT_NAME() can be used in the
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* core when using the appropriate locking. Do not use this in plug-ins or
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* applications in order to retain ABI compatibility.
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*
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* All elements have pads (of the type #GstPad). These pads link to pads on
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* other elements. #GstBuffer flow between these linked pads.
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* A #GstElement has a #GList of #GstPad structures for all their input (or sink)
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* and output (or source) pads.
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* Core and plug-in writers can add and remove pads with gst_element_add_pad()
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* and gst_element_remove_pad().
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*
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* A pad of an element can be retrieved by name with gst_element_get_pad().
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* An iterator of all pads can be retrieved with gst_element_iterate_pads().
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*
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* Elements can be linked through their pads.
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* If the link is straightforward, use the gst_element_link()
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* convenience function to link two elements, or gst_element_link_many()
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* for more elements in a row.
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* Use gst_element_link_filtered() to link two elements constrained by
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* a specified set of #GstCaps.
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* For finer control, use gst_element_link_pads() and
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* gst_element_link_pads_filtered() to specify the pads to link on
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* each element by name.
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*
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* Each element has a state (see #GstState). You can get and set the state
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* of an element with gst_element_get_state() and gst_element_set_state().
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* To get a string representation of a #GstState, use
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* gst_element_state_get_name().
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*
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* You can get and set a #GstClock on an element using gst_element_get_clock()
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* and gst_element_set_clock().
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* Some elements can provide a clock for the pipeline if
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* gst_element_provides_clock() returns %TRUE. With the
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* gst_element_provide_clock() method one can retrieve the clock provided by
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* such an element.
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* Not all elements require a clock to operate correctly. If
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* gst_element_requires_clock() returns %TRUE, a clock should be set on the
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* element with gst_element_set_clock().
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*
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* Note that clock slection and distribution is normally handled by the
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* toplevel #GstPipeline so the clock functions are only to be used in very
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* specific situations.
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*
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* Last reviewed on 2006-03-12 (0.10.5)
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*/
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#include "gst_private.h"
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#include <glib.h>
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#include <stdarg.h>
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#include <gobject/gvaluecollector.h>
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#include "gstelement.h"
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#include "gstbus.h"
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#include "gstmarshal.h"
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#include "gsterror.h"
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#include "gstevent.h"
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#include "gstutils.h"
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#include "gstinfo.h"
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#include "gst-i18n-lib.h"
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/* Element signals and args */
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enum
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{
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NEW_PAD,
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PAD_REMOVED,
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NO_MORE_PADS,
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/* add more above */
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LAST_SIGNAL
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};
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enum
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{
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ARG_0
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/* FILL ME */
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};
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extern void __gst_element_details_clear (GstElementDetails * dp);
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extern void __gst_element_details_copy (GstElementDetails * dest,
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const GstElementDetails * src);
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static void gst_element_class_init (GstElementClass * klass);
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static void gst_element_init (GstElement * element);
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static void gst_element_base_class_init (gpointer g_class);
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static void gst_element_base_class_finalize (gpointer g_class);
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static void gst_element_dispose (GObject * object);
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static void gst_element_finalize (GObject * object);
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static GstStateChangeReturn gst_element_change_state (GstElement * element,
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GstStateChange transition);
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static GstStateChangeReturn gst_element_change_state_func (GstElement * element,
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GstStateChange transition);
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static GstStateChangeReturn gst_element_get_state_func (GstElement * element,
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GstState * state, GstState * pending, GstClockTime timeout);
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static GstStateChangeReturn gst_element_set_state_func (GstElement * element,
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GstState state);
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static void gst_element_set_bus_func (GstElement * element, GstBus * bus);
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#ifndef GST_DISABLE_LOADSAVE
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static xmlNodePtr gst_element_save_thyself (GstObject * object,
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xmlNodePtr parent);
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static void gst_element_restore_thyself (GstObject * parent, xmlNodePtr self);
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#endif
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static GstObjectClass *parent_class = NULL;
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static guint gst_element_signals[LAST_SIGNAL] = { 0 };
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GType
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gst_element_get_type (void)
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{
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static GType gst_element_type = 0;
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if (G_UNLIKELY (gst_element_type == 0)) {
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static const GTypeInfo element_info = {
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sizeof (GstElementClass),
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gst_element_base_class_init,
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gst_element_base_class_finalize,
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(GClassInitFunc) gst_element_class_init,
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NULL,
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NULL,
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sizeof (GstElement),
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0,
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(GInstanceInitFunc) gst_element_init,
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NULL
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};
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gst_element_type = g_type_register_static (GST_TYPE_OBJECT, "GstElement",
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&element_info, G_TYPE_FLAG_ABSTRACT);
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}
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return gst_element_type;
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}
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static void
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gst_element_class_init (GstElementClass * klass)
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{
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GObjectClass *gobject_class;
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GstObjectClass *gstobject_class;
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gobject_class = (GObjectClass *) klass;
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gstobject_class = (GstObjectClass *) klass;
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parent_class = g_type_class_ref (GST_TYPE_OBJECT);
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/**
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* GstElement::pad-added:
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* @gstelement: the object which received the signal
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* @new_pad: the pad that has been added
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*
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* a new #GstPad has been added to the element.
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*/
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gst_element_signals[NEW_PAD] =
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g_signal_new ("pad-added", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstElementClass, pad_added), NULL, NULL,
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gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, G_TYPE_OBJECT);
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/**
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* GstElement::pad-removed:
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* @gstelement: the object which received the signal
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* @old_pad: the pad that has been removed
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*
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* a #GstPad has been removed from the element
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*/
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gst_element_signals[PAD_REMOVED] =
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g_signal_new ("pad-removed", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstElementClass, pad_removed), NULL, NULL,
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gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, G_TYPE_OBJECT);
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/**
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* GstElement::no-more-pads:
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* @gstelement: the object which received the signal
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*
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* This signals that the element will not generate more dynamic pads.
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*/
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gst_element_signals[NO_MORE_PADS] =
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g_signal_new ("no-more-pads", G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstElementClass, no_more_pads), NULL,
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NULL, gst_marshal_VOID__VOID, G_TYPE_NONE, 0);
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gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_element_dispose);
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gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_element_finalize);
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#ifndef GST_DISABLE_LOADSAVE
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gstobject_class->save_thyself = GST_DEBUG_FUNCPTR (gst_element_save_thyself);
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gstobject_class->restore_thyself =
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GST_DEBUG_FUNCPTR (gst_element_restore_thyself);
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#endif
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klass->change_state = GST_DEBUG_FUNCPTR (gst_element_change_state_func);
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klass->set_state = GST_DEBUG_FUNCPTR (gst_element_set_state_func);
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klass->get_state = GST_DEBUG_FUNCPTR (gst_element_get_state_func);
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klass->set_bus = GST_DEBUG_FUNCPTR (gst_element_set_bus_func);
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klass->numpadtemplates = 0;
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klass->elementfactory = NULL;
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}
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static void
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gst_element_base_class_init (gpointer g_class)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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memset (&element_class->details, 0, sizeof (GstElementDetails));
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element_class->padtemplates = NULL;
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}
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static void
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gst_element_base_class_finalize (gpointer g_class)
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{
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GstElementClass *klass = GST_ELEMENT_CLASS (g_class);
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g_list_foreach (klass->padtemplates, (GFunc) gst_object_unref, NULL);
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g_list_free (klass->padtemplates);
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__gst_element_details_clear (&klass->details);
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}
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static void
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gst_element_init (GstElement * element)
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{
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GST_STATE (element) = GST_STATE_NULL;
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GST_STATE_NEXT (element) = GST_STATE_VOID_PENDING;
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GST_STATE_PENDING (element) = GST_STATE_VOID_PENDING;
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GST_STATE_RETURN (element) = GST_STATE_CHANGE_SUCCESS;
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element->state_lock = g_new0 (GStaticRecMutex, 1);
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g_static_rec_mutex_init (element->state_lock);
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element->state_cond = g_cond_new ();
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}
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/**
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* gst_element_default_error:
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* @object: a #GObject that signalled the error.
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* @orig: the #GstObject that initiated the error.
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* @error: the GError.
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* @debug: an additional debug information string, or NULL.
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*
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* A default error signal callback to attach to an element.
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* The user data passed to the g_signal_connect is ignored.
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*
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* The default handler will simply print the error string using g_print.
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*
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* MT safe.
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*/
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void
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gst_element_default_error (GObject * object, GstObject * source, GError * error,
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gchar * debug)
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{
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gchar *name = gst_object_get_path_string (source);
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g_print (_("ERROR: from element %s: %s\n"), name, error->message);
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if (debug)
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g_print (_("Additional debug info:\n%s\n"), debug);
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g_free (name);
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}
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/**
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* gst_element_release_request_pad:
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* @element: a #GstElement to release the request pad of.
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* @pad: the #GstPad to release.
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*
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* Makes the element free the previously requested pad as obtained
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* with gst_element_get_request_pad().
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*
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* MT safe.
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*/
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void
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gst_element_release_request_pad (GstElement * element, GstPad * pad)
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{
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GstElementClass *oclass;
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g_return_if_fail (GST_IS_ELEMENT (element));
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g_return_if_fail (GST_IS_PAD (pad));
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oclass = GST_ELEMENT_GET_CLASS (element);
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if (oclass->release_pad)
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(oclass->release_pad) (element, pad);
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else
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gst_element_remove_pad (element, pad);
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}
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/**
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* gst_element_requires_clock:
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* @element: a #GstElement to query
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*
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* Query if the element requires a clock.
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*
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* Returns: TRUE if the element requires a clock
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*
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* MT safe.
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*/
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gboolean
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gst_element_requires_clock (GstElement * element)
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{
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gboolean result;
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g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
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result = (GST_ELEMENT_GET_CLASS (element)->set_clock != NULL);
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return result;
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}
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/**
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* gst_element_provides_clock:
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* @element: a #GstElement to query
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*
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* Query if the element provides a clock. A #GstClock provided by an
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* element can be used as the global #GstClock for the pipeline.
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*
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* Returns: TRUE if the element provides a clock
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*
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* MT safe.
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*/
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gboolean
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gst_element_provides_clock (GstElement * element)
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{
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gboolean result;
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g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
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result = (GST_ELEMENT_GET_CLASS (element)->provide_clock != NULL);
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return result;
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}
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/**
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* gst_element_provide_clock:
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* @element: a #GstElement to query
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*
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* Get the clock provided by the given element.
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*
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* Returns: the GstClock provided by the element or NULL
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* if no clock could be provided. Unref after usage.
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*
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* MT safe.
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*/
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GstClock *
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gst_element_provide_clock (GstElement * element)
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{
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GstClock *result = NULL;
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GstElementClass *oclass;
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g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
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oclass = GST_ELEMENT_GET_CLASS (element);
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if (oclass->provide_clock)
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result = oclass->provide_clock (element);
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return result;
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}
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/**
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* gst_element_set_clock:
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* @element: a #GstElement to set the clock for.
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* @clock: the #GstClock to set for the element.
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*
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* Sets the clock for the element. This function increases the
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* refcount on the clock. Any previously set clock on the object
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* is unreffed.
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*
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* Returns: TRUE if the element accepted the clock.
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*
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* MT safe.
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*/
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gboolean
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gst_element_set_clock (GstElement * element, GstClock * clock)
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{
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GstElementClass *oclass;
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gboolean res = TRUE;
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g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
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oclass = GST_ELEMENT_GET_CLASS (element);
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GST_DEBUG_OBJECT (element, "setting clock %p", clock);
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if (oclass->set_clock)
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res = oclass->set_clock (element, clock);
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if (res) {
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GST_OBJECT_LOCK (element);
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gst_object_replace ((GstObject **) & element->clock, (GstObject *) clock);
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GST_OBJECT_UNLOCK (element);
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}
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return res;
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}
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/**
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* gst_element_get_clock:
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* @element: a #GstElement to get the clock of.
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*
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* Gets the currently configured clock of the element.
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*
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* Returns: the #GstClock of the element. unref after usage.
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*
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* MT safe.
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*/
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GstClock *
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gst_element_get_clock (GstElement * element)
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{
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GstClock *result;
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g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
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GST_OBJECT_LOCK (element);
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if ((result = element->clock))
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gst_object_ref (result);
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GST_OBJECT_UNLOCK (element);
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return result;
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}
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/**
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* gst_element_set_base_time:
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* @element: a #GstElement.
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* @time: the base time to set.
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*
|
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* Set the base time of an element. See gst_element_get_base_time().
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*
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* MT safe.
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*/
|
|
void
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gst_element_set_base_time (GstElement * element, GstClockTime time)
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{
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g_return_if_fail (GST_IS_ELEMENT (element));
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GST_OBJECT_LOCK (element);
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element->base_time = time;
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GST_OBJECT_UNLOCK (element);
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GST_DEBUG_OBJECT (element, "set base_time=%" GST_TIME_FORMAT,
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GST_TIME_ARGS (time));
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}
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/**
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* gst_element_get_base_time:
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* @element: a #GstElement.
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*
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* Returns the base time of the element. The base time is the
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|
* absolute time of the clock when this element was last put to
|
|
* PLAYING. Substracting the base time from the clock time gives
|
|
* the stream time of the element.
|
|
*
|
|
* Returns: the base time of the element.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstClockTime
|
|
gst_element_get_base_time (GstElement * element)
|
|
{
|
|
GstClockTime result;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), GST_CLOCK_TIME_NONE);
|
|
|
|
GST_OBJECT_LOCK (element);
|
|
result = element->base_time;
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
return result;
|
|
}
|
|
|
|
#ifndef GST_DISABLE_INDEX
|
|
/**
|
|
* gst_element_is_indexable:
|
|
* @element: a #GstElement.
|
|
*
|
|
* Queries if the element can be indexed.
|
|
*
|
|
* Returns: TRUE if the element can be indexed.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_is_indexable (GstElement * element)
|
|
{
|
|
gboolean result;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
|
|
result = (GST_ELEMENT_GET_CLASS (element)->set_index != NULL);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_index:
|
|
* @element: a #GstElement.
|
|
* @index: a #GstIndex.
|
|
*
|
|
* Set @index on the element. The refcount of the index
|
|
* will be increased, any previously set index is unreffed.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
void
|
|
gst_element_set_index (GstElement * element, GstIndex * index)
|
|
{
|
|
GstElementClass *oclass;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
g_return_if_fail (GST_IS_INDEX (index));
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->set_index)
|
|
oclass->set_index (element, index);
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_index:
|
|
* @element: a #GstElement.
|
|
*
|
|
* Gets the index from the element.
|
|
*
|
|
* Returns: a #GstIndex or NULL when no index was set on the
|
|
* element. unref after usage.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstIndex *
|
|
gst_element_get_index (GstElement * element)
|
|
{
|
|
GstElementClass *oclass;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->get_index)
|
|
return oclass->get_index (element);
|
|
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* gst_element_add_pad:
|
|
* @element: a #GstElement to add the pad to.
|
|
* @pad: the #GstPad to add to the element.
|
|
*
|
|
* Adds a pad (link point) to @element. @pad's parent will be set to @element;
|
|
* see gst_object_set_parent() for refcounting information.
|
|
*
|
|
* Pads are not automatically activated so elements should perform the needed
|
|
* steps to activate the pad in case this pad is added in the PAUSED or PLAYING
|
|
* state.
|
|
*
|
|
* The pad and the element should be unlocked when calling this function.
|
|
*
|
|
* Returns: TRUE if the pad could be added. This function can fail when
|
|
* a pad with the same name already existed or the pad already had another
|
|
* parent.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_add_pad (GstElement * element, GstPad * pad)
|
|
{
|
|
gchar *pad_name;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
/* locking pad to look at the name */
|
|
GST_OBJECT_LOCK (pad);
|
|
pad_name = g_strdup (GST_PAD_NAME (pad));
|
|
GST_CAT_INFO_OBJECT (GST_CAT_ELEMENT_PADS, element, "adding pad '%s'",
|
|
GST_STR_NULL (pad_name));
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
/* then check to see if there's already a pad by that name here */
|
|
GST_OBJECT_LOCK (element);
|
|
if (G_UNLIKELY (!gst_object_check_uniqueness (element->pads, pad_name)))
|
|
goto name_exists;
|
|
|
|
/* try to set the pad's parent */
|
|
if (G_UNLIKELY (!gst_object_set_parent (GST_OBJECT_CAST (pad),
|
|
GST_OBJECT_CAST (element))))
|
|
goto had_parent;
|
|
|
|
g_free (pad_name);
|
|
|
|
/* add it to the list */
|
|
switch (gst_pad_get_direction (pad)) {
|
|
case GST_PAD_SRC:
|
|
element->srcpads = g_list_prepend (element->srcpads, pad);
|
|
element->numsrcpads++;
|
|
break;
|
|
case GST_PAD_SINK:
|
|
element->sinkpads = g_list_prepend (element->sinkpads, pad);
|
|
element->numsinkpads++;
|
|
break;
|
|
default:
|
|
goto no_direction;
|
|
}
|
|
element->pads = g_list_prepend (element->pads, pad);
|
|
element->numpads++;
|
|
element->pads_cookie++;
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
/* emit the NEW_PAD signal */
|
|
g_signal_emit (G_OBJECT (element), gst_element_signals[NEW_PAD], 0, pad);
|
|
|
|
return TRUE;
|
|
|
|
/* ERROR cases */
|
|
name_exists:
|
|
{
|
|
g_critical ("Padname %s is not unique in element %s, not adding",
|
|
pad_name, GST_ELEMENT_NAME (element));
|
|
GST_OBJECT_UNLOCK (element);
|
|
g_free (pad_name);
|
|
return FALSE;
|
|
}
|
|
had_parent:
|
|
{
|
|
g_critical
|
|
("Pad %s already has parent when trying to add to element %s",
|
|
pad_name, GST_ELEMENT_NAME (element));
|
|
GST_OBJECT_UNLOCK (element);
|
|
g_free (pad_name);
|
|
return FALSE;
|
|
}
|
|
no_direction:
|
|
{
|
|
GST_OBJECT_LOCK (pad);
|
|
g_critical
|
|
("Trying to add pad %s to element %s, but it has no direction",
|
|
GST_OBJECT_NAME (pad), GST_ELEMENT_NAME (element));
|
|
GST_OBJECT_UNLOCK (pad);
|
|
GST_OBJECT_UNLOCK (element);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_remove_pad:
|
|
* @element: a #GstElement to remove pad from.
|
|
* @pad: the #GstPad to remove from the element.
|
|
*
|
|
* Removes @pad from @element. @pad will be destroyed if it has not been
|
|
* referenced elsewhere.
|
|
*
|
|
* Returns: TRUE if the pad could be removed. Can return FALSE if the
|
|
* pad is not belonging to the provided element.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_remove_pad (GstElement * element, GstPad * pad)
|
|
{
|
|
GstPad *peer;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
/* locking pad to look at the name and parent */
|
|
GST_OBJECT_LOCK (pad);
|
|
GST_CAT_INFO_OBJECT (GST_CAT_ELEMENT_PADS, element, "removing pad '%s'",
|
|
GST_STR_NULL (GST_PAD_NAME (pad)));
|
|
|
|
if (G_UNLIKELY (GST_PAD_PARENT (pad) != element))
|
|
goto not_our_pad;
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
/* unlink */
|
|
if ((peer = gst_pad_get_peer (pad))) {
|
|
/* window for MT unsafeness, someone else could unlink here
|
|
* and then we call unlink with wrong pads. The unlink
|
|
* function would catch this and safely return failed. */
|
|
if (GST_PAD_IS_SRC (pad))
|
|
gst_pad_unlink (pad, peer);
|
|
else
|
|
gst_pad_unlink (peer, pad);
|
|
|
|
gst_object_unref (peer);
|
|
}
|
|
|
|
GST_OBJECT_LOCK (element);
|
|
/* remove it from the list */
|
|
switch (gst_pad_get_direction (pad)) {
|
|
case GST_PAD_SRC:
|
|
element->srcpads = g_list_remove (element->srcpads, pad);
|
|
element->numsrcpads--;
|
|
break;
|
|
case GST_PAD_SINK:
|
|
element->sinkpads = g_list_remove (element->sinkpads, pad);
|
|
element->numsinkpads--;
|
|
break;
|
|
default:
|
|
g_critical ("Removing pad without direction???");
|
|
break;
|
|
}
|
|
element->pads = g_list_remove (element->pads, pad);
|
|
element->numpads--;
|
|
element->pads_cookie++;
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
g_signal_emit (G_OBJECT (element), gst_element_signals[PAD_REMOVED], 0, pad);
|
|
|
|
gst_object_unparent (GST_OBJECT (pad));
|
|
|
|
return TRUE;
|
|
|
|
not_our_pad:
|
|
{
|
|
/* FIXME, locking order? */
|
|
GST_OBJECT_LOCK (element);
|
|
g_critical ("Padname %s:%s does not belong to element %s when removing",
|
|
GST_ELEMENT_NAME (GST_PAD_PARENT (pad)), GST_PAD_NAME (pad),
|
|
GST_ELEMENT_NAME (element));
|
|
GST_OBJECT_UNLOCK (element);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_no_more_pads:
|
|
* @element: a #GstElement
|
|
*
|
|
* Use this function to signal that the element does not expect any more pads
|
|
* to show up in the current pipeline. This function should be called whenever
|
|
* pads have been added by the element itself. Elements with #GST_PAD_SOMETIMES
|
|
* pad templates use this in combination with autopluggers to figure out that
|
|
* the element is done initializing its pads.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
void
|
|
gst_element_no_more_pads (GstElement * element)
|
|
{
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
g_signal_emit (element, gst_element_signals[NO_MORE_PADS], 0);
|
|
}
|
|
|
|
static gint
|
|
pad_compare_name (GstPad * pad1, const gchar * name)
|
|
{
|
|
gint result;
|
|
|
|
GST_OBJECT_LOCK (pad1);
|
|
result = strcmp (GST_PAD_NAME (pad1), name);
|
|
GST_OBJECT_UNLOCK (pad1);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_static_pad:
|
|
* @element: a #GstElement to find a static pad of.
|
|
* @name: the name of the static #GstPad to retrieve.
|
|
*
|
|
* Retrieves a pad from @element by name. This version only retrieves
|
|
* already-existing (i.e. 'static') pads.
|
|
*
|
|
* Returns: the requested #GstPad if found, otherwise NULL. unref after
|
|
* usage.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstPad *
|
|
gst_element_get_static_pad (GstElement * element, const gchar * name)
|
|
{
|
|
GList *find;
|
|
GstPad *result = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
g_return_val_if_fail (name != NULL, NULL);
|
|
|
|
GST_OBJECT_LOCK (element);
|
|
find =
|
|
g_list_find_custom (element->pads, name, (GCompareFunc) pad_compare_name);
|
|
if (find) {
|
|
result = GST_PAD_CAST (find->data);
|
|
gst_object_ref (result);
|
|
}
|
|
|
|
if (result == NULL) {
|
|
GST_CAT_INFO (GST_CAT_ELEMENT_PADS, "no such pad '%s' in element \"%s\"",
|
|
name, GST_ELEMENT_NAME (element));
|
|
} else {
|
|
GST_CAT_INFO (GST_CAT_ELEMENT_PADS, "found pad %s:%s",
|
|
GST_ELEMENT_NAME (element), name);
|
|
}
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
return result;
|
|
}
|
|
|
|
static GstPad *
|
|
gst_element_request_pad (GstElement * element, GstPadTemplate * templ,
|
|
const gchar * name)
|
|
{
|
|
GstPad *newpad = NULL;
|
|
GstElementClass *oclass;
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->request_new_pad)
|
|
newpad = (oclass->request_new_pad) (element, templ, name);
|
|
|
|
if (newpad)
|
|
gst_object_ref (newpad);
|
|
|
|
return newpad;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_request_pad:
|
|
* @element: a #GstElement to find a request pad of.
|
|
* @name: the name of the request #GstPad to retrieve.
|
|
*
|
|
* Retrieves a pad from the element by name. This version only retrieves
|
|
* request pads.
|
|
*
|
|
* Returns: requested #GstPad if found, otherwise NULL. Unref after usage.
|
|
*/
|
|
GstPad *
|
|
gst_element_get_request_pad (GstElement * element, const gchar * name)
|
|
{
|
|
GstPadTemplate *templ = NULL;
|
|
GstPad *pad;
|
|
const gchar *req_name = NULL;
|
|
gboolean templ_found = FALSE;
|
|
GList *list;
|
|
gint n;
|
|
const gchar *data;
|
|
gchar *str, *endptr = NULL;
|
|
GstElementClass *class;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
g_return_val_if_fail (name != NULL, NULL);
|
|
|
|
class = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (strstr (name, "%")) {
|
|
templ = gst_element_class_get_pad_template (class, name);
|
|
req_name = NULL;
|
|
if (templ)
|
|
templ_found = TRUE;
|
|
} else {
|
|
list = gst_element_class_get_pad_template_list (class);
|
|
while (!templ_found && list) {
|
|
templ = (GstPadTemplate *) list->data;
|
|
if (templ->presence == GST_PAD_REQUEST) {
|
|
/* Because of sanity checks in gst_pad_template_new(), we know that %s
|
|
and %d, occurring at the end of the name_template, are the only
|
|
possibilities. */
|
|
GST_CAT_DEBUG (GST_CAT_PADS, "comparing %s to %s", name,
|
|
templ->name_template);
|
|
if ((str = strchr (templ->name_template, '%'))
|
|
&& strncmp (templ->name_template, name,
|
|
str - templ->name_template) == 0
|
|
&& strlen (name) > str - templ->name_template) {
|
|
data = name + (str - templ->name_template);
|
|
if (*(str + 1) == 'd') {
|
|
/* it's an int */
|
|
n = (gint) strtol (data, &endptr, 10);
|
|
if (endptr && *endptr == '\0') {
|
|
templ_found = TRUE;
|
|
req_name = name;
|
|
break;
|
|
}
|
|
} else {
|
|
/* it's a string */
|
|
templ_found = TRUE;
|
|
req_name = name;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
list = list->next;
|
|
}
|
|
}
|
|
|
|
if (!templ_found)
|
|
return NULL;
|
|
|
|
pad = gst_element_request_pad (element, templ, req_name);
|
|
|
|
return pad;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_pad:
|
|
* @element: a #GstElement.
|
|
* @name: the name of the pad to retrieve.
|
|
*
|
|
* Retrieves a pad from @element by name. Tries gst_element_get_static_pad()
|
|
* first, then gst_element_get_request_pad().
|
|
*
|
|
* Returns: the #GstPad if found, otherwise %NULL. Unref after usage.
|
|
*/
|
|
GstPad *
|
|
gst_element_get_pad (GstElement * element, const gchar * name)
|
|
{
|
|
GstPad *pad;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
g_return_val_if_fail (name != NULL, NULL);
|
|
|
|
pad = gst_element_get_static_pad (element, name);
|
|
if (!pad)
|
|
pad = gst_element_get_request_pad (element, name);
|
|
|
|
return pad;
|
|
}
|
|
|
|
static GstIteratorItem
|
|
iterate_pad (GstIterator * it, GstPad * pad)
|
|
{
|
|
gst_object_ref (pad);
|
|
return GST_ITERATOR_ITEM_PASS;
|
|
}
|
|
|
|
static GstIterator *
|
|
gst_element_iterate_pad_list (GstElement * element, GList ** padlist)
|
|
{
|
|
GstIterator *result;
|
|
|
|
GST_OBJECT_LOCK (element);
|
|
gst_object_ref (element);
|
|
result = gst_iterator_new_list (GST_TYPE_PAD,
|
|
GST_OBJECT_GET_LOCK (element),
|
|
&element->pads_cookie,
|
|
padlist,
|
|
element,
|
|
(GstIteratorItemFunction) iterate_pad,
|
|
(GstIteratorDisposeFunction) gst_object_unref);
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_iterate_pads:
|
|
* @element: a #GstElement to iterate pads of.
|
|
*
|
|
* Retrieves an iterattor of @element's pads. The iterator should
|
|
* be freed after usage.
|
|
*
|
|
* Returns: the #GstIterator of #GstPad. Unref each pad after use.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstIterator *
|
|
gst_element_iterate_pads (GstElement * element)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
return gst_element_iterate_pad_list (element, &element->pads);
|
|
}
|
|
|
|
/**
|
|
* gst_element_iterate_src_pads:
|
|
* @element: a #GstElement.
|
|
*
|
|
* Retrieves an iterator of @element's source pads.
|
|
*
|
|
* Returns: the #GstIterator of #GstPad. Unref each pad after use.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstIterator *
|
|
gst_element_iterate_src_pads (GstElement * element)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
return gst_element_iterate_pad_list (element, &element->srcpads);
|
|
}
|
|
|
|
/**
|
|
* gst_element_iterate_sink_pads:
|
|
* @element: a #GstElement.
|
|
*
|
|
* Retrieves an iterator of @element's sink pads.
|
|
*
|
|
* Returns: the #GstIterator of #GstPad. Unref each pad after use.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstIterator *
|
|
gst_element_iterate_sink_pads (GstElement * element)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
return gst_element_iterate_pad_list (element, &element->sinkpads);
|
|
}
|
|
|
|
/**
|
|
* gst_element_class_add_pad_template:
|
|
* @klass: the #GstElementClass to add the pad template to.
|
|
* @templ: a #GstPadTemplate to add to the element class.
|
|
*
|
|
* Adds a padtemplate to an element class. This is mainly used in the _base_init
|
|
* functions of classes.
|
|
*/
|
|
void
|
|
gst_element_class_add_pad_template (GstElementClass * klass,
|
|
GstPadTemplate * templ)
|
|
{
|
|
g_return_if_fail (GST_IS_ELEMENT_CLASS (klass));
|
|
g_return_if_fail (GST_IS_PAD_TEMPLATE (templ));
|
|
|
|
/* avoid registering pad templates with the same name */
|
|
g_return_if_fail (gst_element_class_get_pad_template (klass,
|
|
templ->name_template) == NULL);
|
|
|
|
klass->padtemplates = g_list_append (klass->padtemplates,
|
|
gst_object_ref (templ));
|
|
klass->numpadtemplates++;
|
|
}
|
|
|
|
/**
|
|
* gst_element_class_set_details:
|
|
* @klass: class to set details for
|
|
* @details: details to set
|
|
*
|
|
* Sets the detailed information for a #GstElementClass.
|
|
* <note>This function is for use in _base_init functions only.</note>
|
|
*/
|
|
void
|
|
gst_element_class_set_details (GstElementClass * klass,
|
|
const GstElementDetails * details)
|
|
{
|
|
g_return_if_fail (GST_IS_ELEMENT_CLASS (klass));
|
|
g_return_if_fail (GST_IS_ELEMENT_DETAILS (details));
|
|
|
|
__gst_element_details_copy (&klass->details, details);
|
|
}
|
|
|
|
/**
|
|
* gst_element_class_get_pad_template_list:
|
|
* @element_class: a #GstElementClass to get pad templates of.
|
|
*
|
|
* Retrieves a list of the pad templates associated with @element_class. The
|
|
* list must not be modified by the calling code.
|
|
* <note>If you use this function in the #GInstanceInitFunc of an object class
|
|
* that has subclasses, make sure to pass the g_class parameter of the
|
|
* #GInstanceInitFunc here.</note>
|
|
*
|
|
* Returns: the #GList of padtemplates.
|
|
*/
|
|
GList *
|
|
gst_element_class_get_pad_template_list (GstElementClass * element_class)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT_CLASS (element_class), NULL);
|
|
|
|
return element_class->padtemplates;
|
|
}
|
|
|
|
/**
|
|
* gst_element_class_get_pad_template:
|
|
* @element_class: a #GstElementClass to get the pad template of.
|
|
* @name: the name of the #GstPadTemplate to get.
|
|
*
|
|
* Retrieves a padtemplate from @element_class with the given name.
|
|
* <note>If you use this function in the #GInstanceInitFunc of an object class
|
|
* that has subclasses, make sure to pass the g_class parameter of the
|
|
* #GInstanceInitFunc here.</note>
|
|
*
|
|
* Returns: the #GstPadTemplate with the given name, or NULL if none was found.
|
|
* No unreferencing is necessary.
|
|
*/
|
|
GstPadTemplate *
|
|
gst_element_class_get_pad_template (GstElementClass * element_class,
|
|
const gchar * name)
|
|
{
|
|
GList *padlist;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT_CLASS (element_class), NULL);
|
|
g_return_val_if_fail (name != NULL, NULL);
|
|
|
|
padlist = gst_element_class_get_pad_template_list (element_class);
|
|
|
|
while (padlist) {
|
|
GstPadTemplate *padtempl = (GstPadTemplate *) padlist->data;
|
|
|
|
if (strcmp (padtempl->name_template, name) == 0)
|
|
return padtempl;
|
|
|
|
padlist = g_list_next (padlist);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static GstPad *
|
|
gst_element_get_random_pad (GstElement * element, GstPadDirection dir)
|
|
{
|
|
GstPad *result = NULL;
|
|
GList *pads;
|
|
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "getting a random pad");
|
|
|
|
switch (dir) {
|
|
case GST_PAD_SRC:
|
|
GST_OBJECT_LOCK (element);
|
|
pads = element->srcpads;
|
|
break;
|
|
case GST_PAD_SINK:
|
|
GST_OBJECT_LOCK (element);
|
|
pads = element->sinkpads;
|
|
break;
|
|
default:
|
|
goto wrong_direction;
|
|
}
|
|
for (; pads; pads = g_list_next (pads)) {
|
|
GstPad *pad = GST_PAD (pads->data);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "checking pad %s:%s",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
|
|
if (GST_PAD_IS_LINKED (pad)) {
|
|
GST_OBJECT_UNLOCK (pad);
|
|
result = pad;
|
|
break;
|
|
} else {
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "pad %s:%s is not linked",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
}
|
|
GST_OBJECT_UNLOCK (pad);
|
|
}
|
|
if (result)
|
|
gst_object_ref (result);
|
|
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
return result;
|
|
|
|
/* ERROR handling */
|
|
wrong_direction:
|
|
{
|
|
g_warning ("unknown pad direction %d", dir);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_send_event:
|
|
* @element: a #GstElement to send the event to.
|
|
* @event: the #GstEvent to send to the element.
|
|
*
|
|
* Sends an event to an element. If the element doesn't
|
|
* implement an event handler, the event will be forwarded
|
|
* to a random sink pad. This function takes owership of the
|
|
* provided event so you should gst_event_ref() it if you want to reuse
|
|
* the event after this call.
|
|
*
|
|
* Returns: TRUE if the event was handled.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_send_event (GstElement * element, GstEvent * event)
|
|
{
|
|
GstElementClass *oclass;
|
|
gboolean result = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
g_return_val_if_fail (event != NULL, FALSE);
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->send_event) {
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "send %s event on element %s",
|
|
GST_EVENT_TYPE_NAME (event), GST_ELEMENT_NAME (element));
|
|
result = oclass->send_event (element, event);
|
|
} else {
|
|
GstPad *pad = GST_EVENT_IS_DOWNSTREAM (event) ?
|
|
gst_element_get_random_pad (element, GST_PAD_SRC) :
|
|
gst_element_get_random_pad (element, GST_PAD_SINK);
|
|
|
|
if (pad) {
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
|
|
"pushing %s event to random %s pad %s:%s",
|
|
GST_EVENT_TYPE_NAME (event),
|
|
(GST_PAD_DIRECTION (pad) == GST_PAD_SRC ? "src" : "sink"),
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
|
|
result = gst_pad_push_event (pad, event);
|
|
gst_object_unref (pad);
|
|
} else {
|
|
GST_CAT_INFO (GST_CAT_ELEMENT_PADS, "can't send %s event on element %s",
|
|
GST_EVENT_TYPE_NAME (event), GST_ELEMENT_NAME (element));
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_seek:
|
|
* @element: a #GstElement to send the event to.
|
|
* @rate: The new playback rate
|
|
* @format: The format of the seek values
|
|
* @flags: The optional seek flags.
|
|
* @cur_type: The type and flags for the new current position
|
|
* @cur: The value of the new current position
|
|
* @stop_type: The type and flags for the new stop position
|
|
* @stop: The value of the new stop position
|
|
*
|
|
* Sends a seek event to an element.
|
|
*
|
|
* Returns: %TRUE if the event was handled.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_seek (GstElement * element, gdouble rate, GstFormat format,
|
|
GstSeekFlags flags, GstSeekType cur_type, gint64 cur,
|
|
GstSeekType stop_type, gint64 stop)
|
|
{
|
|
GstEvent *event;
|
|
gboolean result;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
|
|
event =
|
|
gst_event_new_seek (rate, format, flags, cur_type, cur, stop_type, stop);
|
|
result = gst_element_send_event (element, event);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_query_types:
|
|
* @element: a #GstElement to query
|
|
*
|
|
* Get an array of query types from the element.
|
|
* If the element doesn't implement a query types function,
|
|
* the query will be forwarded to a random sink pad.
|
|
*
|
|
* Returns: An array of #GstQueryType elements that should not
|
|
* be freed or modified.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
const GstQueryType *
|
|
gst_element_get_query_types (GstElement * element)
|
|
{
|
|
GstElementClass *oclass;
|
|
const GstQueryType *result = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->get_query_types) {
|
|
result = oclass->get_query_types (element);
|
|
} else {
|
|
GstPad *pad = gst_element_get_random_pad (element, GST_PAD_SINK);
|
|
|
|
if (pad) {
|
|
GstPad *peer = gst_pad_get_peer (pad);
|
|
|
|
if (peer) {
|
|
result = gst_pad_get_query_types (peer);
|
|
|
|
gst_object_unref (peer);
|
|
}
|
|
gst_object_unref (pad);
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_query:
|
|
* @element: a #GstElement to perform the query on.
|
|
* @query: the #GstQuery.
|
|
*
|
|
* Performs a query on the given element. If the format is set
|
|
* to #GST_FORMAT_DEFAULT and this function returns TRUE, the
|
|
* format pointer will hold the default format.
|
|
* For element that don't implement a query handler, this function
|
|
* forwards the query to a random usable sinkpad of this element.
|
|
*
|
|
* Returns: TRUE if the query could be performed.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_query (GstElement * element, GstQuery * query)
|
|
{
|
|
GstElementClass *oclass;
|
|
gboolean result = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
g_return_val_if_fail (query != NULL, FALSE);
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->query) {
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "send query on element %s",
|
|
GST_ELEMENT_NAME (element));
|
|
result = oclass->query (element, query);
|
|
} else {
|
|
GstPad *pad = gst_element_get_random_pad (element, GST_PAD_SRC);
|
|
|
|
if (pad) {
|
|
result = gst_pad_query (pad, query);
|
|
|
|
gst_object_unref (pad);
|
|
} else {
|
|
pad = gst_element_get_random_pad (element, GST_PAD_SINK);
|
|
if (pad) {
|
|
GstPad *peer = gst_pad_get_peer (pad);
|
|
|
|
if (peer) {
|
|
result = gst_pad_query (peer, query);
|
|
|
|
gst_object_unref (peer);
|
|
}
|
|
gst_object_unref (pad);
|
|
}
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_post_message:
|
|
* @element: a #GstElement posting the message
|
|
* @message: a #GstMessage to post
|
|
*
|
|
* Post a message on the element's #GstBus. This function takes ownership of the
|
|
* message; if you want to access the message after this call, you should add an
|
|
* additional reference before calling.
|
|
*
|
|
* Returns: TRUE if the message was successfully posted.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_post_message (GstElement * element, GstMessage * message)
|
|
{
|
|
GstBus *bus;
|
|
gboolean result = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
g_return_val_if_fail (message != NULL, FALSE);
|
|
|
|
GST_OBJECT_LOCK (element);
|
|
bus = element->bus;
|
|
|
|
if (G_UNLIKELY (bus == NULL))
|
|
goto no_bus;
|
|
|
|
gst_object_ref (bus);
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
result = gst_bus_post (bus, message);
|
|
gst_object_unref (bus);
|
|
|
|
return result;
|
|
|
|
no_bus:
|
|
{
|
|
GST_DEBUG ("not posting message %p: no bus", message);
|
|
GST_OBJECT_UNLOCK (element);
|
|
gst_message_unref (message);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* _gst_element_error_printf:
|
|
* @format: the printf-like format to use, or NULL
|
|
*
|
|
* This function is only used internally by the gst_element_error() macro.
|
|
*
|
|
* Returns: a newly allocated string, or NULL if the format was NULL or ""
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gchar *
|
|
_gst_element_error_printf (const gchar * format, ...)
|
|
{
|
|
va_list args;
|
|
gchar *buffer;
|
|
|
|
if (format == NULL)
|
|
return NULL;
|
|
if (format[0] == 0)
|
|
return NULL;
|
|
|
|
va_start (args, format);
|
|
buffer = g_strdup_vprintf (format, args);
|
|
va_end (args);
|
|
return buffer;
|
|
}
|
|
|
|
/**
|
|
* gst_element_message_full:
|
|
* @element: a #GstElement to send message from
|
|
* @type: the #GstMessageType
|
|
* @domain: the GStreamer GError domain this message belongs to
|
|
* @code: the GError code belonging to the domain
|
|
* @text: an allocated text string to be used as a replacement for the
|
|
* default message connected to code, or NULL
|
|
* @debug: an allocated debug message to be used as a replacement for the
|
|
* default debugging information, or NULL
|
|
* @file: the source code file where the error was generated
|
|
* @function: the source code function where the error was generated
|
|
* @line: the source code line where the error was generated
|
|
*
|
|
* Post an error or warning message on the bus from inside an element.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
void gst_element_message_full
|
|
(GstElement * element, GstMessageType type,
|
|
GQuark domain, gint code, gchar * text,
|
|
gchar * debug, const gchar * file, const gchar * function, gint line)
|
|
{
|
|
GError *gerror = NULL;
|
|
gchar *name;
|
|
gchar *sent_text;
|
|
gchar *sent_debug;
|
|
gboolean has_debug = TRUE;
|
|
GstMessage *message = NULL;
|
|
|
|
/* checks */
|
|
GST_DEBUG_OBJECT (element, "start");
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
g_return_if_fail ((type == GST_MESSAGE_ERROR) ||
|
|
(type == GST_MESSAGE_WARNING));
|
|
|
|
/* check if we send the given text or the default error text */
|
|
if ((text == NULL) || (text[0] == 0)) {
|
|
/* text could have come from g_strdup_printf (""); */
|
|
g_free (text);
|
|
sent_text = gst_error_get_message (domain, code);
|
|
} else
|
|
sent_text = text;
|
|
|
|
/* construct a sent_debug with extra information from source */
|
|
if ((debug == NULL) || (debug[0] == 0)) {
|
|
/* debug could have come from g_strdup_printf (""); */
|
|
has_debug = FALSE;
|
|
}
|
|
|
|
name = gst_object_get_path_string (GST_OBJECT (element));
|
|
if (has_debug)
|
|
sent_debug = g_strdup_printf ("%s(%d): %s (): %s:\n%s",
|
|
file, line, function, name, debug);
|
|
else
|
|
sent_debug = g_strdup_printf ("%s(%d): %s (): %s",
|
|
file, line, function, name);
|
|
g_free (name);
|
|
g_free (debug);
|
|
|
|
/* create gerror and post message */
|
|
GST_CAT_INFO_OBJECT (GST_CAT_ERROR_SYSTEM, element, "posting message: %s",
|
|
sent_text);
|
|
gerror = g_error_new_literal (domain, code, sent_text);
|
|
|
|
if (type == GST_MESSAGE_ERROR) {
|
|
message = gst_message_new_error (GST_OBJECT (element), gerror, sent_debug);
|
|
} else if (type == GST_MESSAGE_WARNING) {
|
|
message = gst_message_new_warning (GST_OBJECT (element), gerror,
|
|
sent_debug);
|
|
} else {
|
|
g_assert_not_reached ();
|
|
}
|
|
gst_element_post_message (element, message);
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_ERROR_SYSTEM, element, "posted message: %s",
|
|
sent_text);
|
|
|
|
/* cleanup */
|
|
g_error_free (gerror);
|
|
g_free (sent_debug);
|
|
g_free (sent_text);
|
|
}
|
|
|
|
/**
|
|
* gst_element_is_locked_state:
|
|
* @element: a #GstElement.
|
|
*
|
|
* Checks if the state of an element is locked.
|
|
* If the state of an element is locked, state changes of the parent don't
|
|
* affect the element.
|
|
* This way you can leave currently unused elements inside bins. Just lock their
|
|
* state before changing the state from #GST_STATE_NULL.
|
|
*
|
|
* MT safe.
|
|
*
|
|
* Returns: TRUE, if the element's state is locked.
|
|
*/
|
|
gboolean
|
|
gst_element_is_locked_state (GstElement * element)
|
|
{
|
|
gboolean result;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
|
|
GST_OBJECT_LOCK (element);
|
|
result = GST_OBJECT_FLAG_IS_SET (element, GST_ELEMENT_LOCKED_STATE);
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_locked_state:
|
|
* @element: a #GstElement
|
|
* @locked_state: TRUE to lock the element's state
|
|
*
|
|
* Locks the state of an element, so state changes of the parent don't affect
|
|
* this element anymore.
|
|
*
|
|
* MT safe.
|
|
*
|
|
* Returns: TRUE if the state was changed, FALSE if bad parameterss were given
|
|
* or the elements state-locking needed no change.
|
|
*/
|
|
gboolean
|
|
gst_element_set_locked_state (GstElement * element, gboolean locked_state)
|
|
{
|
|
gboolean old;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
|
|
GST_OBJECT_LOCK (element);
|
|
old = GST_OBJECT_FLAG_IS_SET (element, GST_ELEMENT_LOCKED_STATE);
|
|
|
|
if (G_UNLIKELY (old == locked_state))
|
|
goto was_ok;
|
|
|
|
if (locked_state) {
|
|
GST_CAT_DEBUG (GST_CAT_STATES, "locking state of element %s",
|
|
GST_ELEMENT_NAME (element));
|
|
GST_OBJECT_FLAG_SET (element, GST_ELEMENT_LOCKED_STATE);
|
|
} else {
|
|
GST_CAT_DEBUG (GST_CAT_STATES, "unlocking state of element %s",
|
|
GST_ELEMENT_NAME (element));
|
|
GST_OBJECT_FLAG_UNSET (element, GST_ELEMENT_LOCKED_STATE);
|
|
}
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
return TRUE;
|
|
|
|
was_ok:
|
|
GST_CAT_DEBUG (GST_CAT_STATES, "elements %s was in locked state %d",
|
|
GST_ELEMENT_NAME (element), old);
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* gst_element_sync_state_with_parent:
|
|
* @element: a #GstElement.
|
|
*
|
|
* Tries to change the state of the element to the same as its parent.
|
|
* If this function returns FALSE, the state of element is undefined.
|
|
*
|
|
* Returns: TRUE, if the element's state could be synced to the parent's state.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_sync_state_with_parent (GstElement * element)
|
|
{
|
|
GstElement *parent;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
|
|
if ((parent = GST_ELEMENT_CAST (gst_element_get_parent (element)))) {
|
|
GstState parent_current, parent_pending;
|
|
GstStateChangeReturn ret;
|
|
|
|
GST_OBJECT_LOCK (parent);
|
|
parent_current = GST_STATE (parent);
|
|
parent_pending = GST_STATE_PENDING (parent);
|
|
GST_OBJECT_UNLOCK (parent);
|
|
|
|
GST_CAT_DEBUG (GST_CAT_STATES,
|
|
"syncing state of element %s (%s) to %s (%s, %s)",
|
|
GST_ELEMENT_NAME (element),
|
|
gst_element_state_get_name (GST_STATE (element)),
|
|
GST_ELEMENT_NAME (parent), gst_element_state_get_name (parent_current),
|
|
gst_element_state_get_name (parent_pending));
|
|
|
|
ret = gst_element_set_state (element, parent_current);
|
|
if (ret == GST_STATE_CHANGE_FAILURE)
|
|
goto failed;
|
|
|
|
gst_object_unref (parent);
|
|
|
|
return TRUE;
|
|
}
|
|
return FALSE;
|
|
|
|
/* ERROR */
|
|
failed:
|
|
{
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/* MT safe */
|
|
static GstStateChangeReturn
|
|
gst_element_get_state_func (GstElement * element,
|
|
GstState * state, GstState * pending, GstClockTime timeout)
|
|
{
|
|
GstStateChangeReturn ret = GST_STATE_CHANGE_FAILURE;
|
|
GstState old_pending;
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element, "getting state");
|
|
|
|
GST_OBJECT_LOCK (element);
|
|
ret = GST_STATE_RETURN (element);
|
|
|
|
/* we got an error, report immediatly */
|
|
if (ret == GST_STATE_CHANGE_FAILURE)
|
|
goto done;
|
|
|
|
/* we got no_preroll, report immediatly */
|
|
if (ret == GST_STATE_CHANGE_NO_PREROLL)
|
|
goto done;
|
|
|
|
/* no need to wait async if we are not async */
|
|
if (ret != GST_STATE_CHANGE_ASYNC)
|
|
goto done;
|
|
|
|
old_pending = GST_STATE_PENDING (element);
|
|
if (old_pending != GST_STATE_VOID_PENDING) {
|
|
GTimeVal *timeval, abstimeout;
|
|
guint32 cookie;
|
|
|
|
if (timeout != GST_CLOCK_TIME_NONE) {
|
|
glong add = timeout / 1000;
|
|
|
|
if (add == 0)
|
|
goto done;
|
|
|
|
/* make timeout absolute */
|
|
g_get_current_time (&abstimeout);
|
|
g_time_val_add (&abstimeout, add);
|
|
timeval = &abstimeout;
|
|
} else {
|
|
timeval = NULL;
|
|
}
|
|
/* get cookie to dected state change during waiting */
|
|
cookie = element->state_cookie;
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
|
|
"waiting for element to commit state");
|
|
|
|
/* we have a pending state change, wait for it to complete */
|
|
if (!GST_STATE_TIMED_WAIT (element, timeval)) {
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element, "timed out");
|
|
/* timeout triggered */
|
|
ret = GST_STATE_CHANGE_ASYNC;
|
|
} else {
|
|
if (cookie != element->state_cookie)
|
|
goto interrupted;
|
|
|
|
/* could be success or failure */
|
|
if (old_pending == GST_STATE (element)) {
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element, "got success");
|
|
ret = GST_STATE_CHANGE_SUCCESS;
|
|
} else {
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element, "got failure");
|
|
ret = GST_STATE_CHANGE_FAILURE;
|
|
}
|
|
}
|
|
}
|
|
/* if nothing is pending anymore we can return SUCCESS */
|
|
if (GST_STATE_PENDING (element) == GST_STATE_VOID_PENDING) {
|
|
GST_CAT_LOG_OBJECT (GST_CAT_STATES, element, "nothing pending");
|
|
ret = GST_STATE_CHANGE_SUCCESS;
|
|
}
|
|
|
|
done:
|
|
if (state)
|
|
*state = GST_STATE (element);
|
|
if (pending)
|
|
*pending = GST_STATE_PENDING (element);
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"state current: %s, pending: %s, result: %d",
|
|
gst_element_state_get_name (GST_STATE (element)),
|
|
gst_element_state_get_name (GST_STATE_PENDING (element)), ret);
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
return ret;
|
|
|
|
interrupted:
|
|
{
|
|
if (state)
|
|
*state = GST_STATE_VOID_PENDING;
|
|
if (pending)
|
|
*pending = GST_STATE_VOID_PENDING;
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element, "get_state() interruped");
|
|
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
return GST_STATE_CHANGE_FAILURE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_state:
|
|
* @element: a #GstElement to get the state of.
|
|
* @state: a pointer to #GstState to hold the state. Can be NULL.
|
|
* @pending: a pointer to #GstState to hold the pending state.
|
|
* Can be %NULL.
|
|
* @timeout: a #GstClockTime to specify the timeout for an async
|
|
* state change or %GST_CLOCK_TIME_NONE for infinite timeout.
|
|
*
|
|
* Gets the state of the element.
|
|
*
|
|
* For elements that performed an ASYNC state change, as reported by
|
|
* gst_element_set_state(), this function will block up to the
|
|
* specified timeout value for the state change to complete.
|
|
* If the element completes the state change or goes into
|
|
* an error, this function returns immediately with a return value of
|
|
* %GST_STATE_CHANGE_SUCCESS or %GST_STATE_CHANGE_FAILURE respectively.
|
|
*
|
|
* For elements that did not return %GST_STATE_CHANGE_ASYNC, this function
|
|
* returns the current and pending state immediately.
|
|
*
|
|
* This function returns %GST_STATE_CHANGE_NO_PREROLL if the element
|
|
* successfully changed its state but is not able to provide data yet.
|
|
* This mostly
|
|
* happens for live sources that only produce data in the PLAYING state.
|
|
* While the state change return is equivalent to %GST_STATE_CHANGE_SUCCESS, it
|
|
* is returned to the application to signal that some sink elements might not
|
|
* be able to complete their state change because an element is not producing
|
|
* data to complete the preroll. When setting the element to playing,
|
|
* the preroll will complete and playback will start.
|
|
*
|
|
* Returns: %GST_STATE_CHANGE_SUCCESS if the element has no more pending state
|
|
* and the last state change succeeded, %GST_STATE_CHANGE_ASYNC if the
|
|
* element is still performing a state change or
|
|
* %GST_STATE_CHANGE_FAILURE if the last state change failed.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstStateChangeReturn
|
|
gst_element_get_state (GstElement * element,
|
|
GstState * state, GstState * pending, GstClockTime timeout)
|
|
{
|
|
GstElementClass *oclass;
|
|
GstStateChangeReturn result = GST_STATE_CHANGE_FAILURE;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), GST_STATE_CHANGE_FAILURE);
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->get_state)
|
|
result = (oclass->get_state) (element, state, pending, timeout);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_abort_state:
|
|
* @element: a #GstElement to abort the state of.
|
|
*
|
|
* Abort the state change of the element. This function is used
|
|
* by elements that do asynchronous state changes and find out
|
|
* something is wrong.
|
|
*
|
|
* This function should be called with the STATE_LOCK held.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
void
|
|
gst_element_abort_state (GstElement * element)
|
|
{
|
|
GstState pending;
|
|
|
|
#ifndef GST_DISABLE_GST_DEBUG
|
|
GstState old_state;
|
|
#endif
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
GST_OBJECT_LOCK (element);
|
|
pending = GST_STATE_PENDING (element);
|
|
|
|
if (pending == GST_STATE_VOID_PENDING ||
|
|
GST_STATE_RETURN (element) == GST_STATE_CHANGE_FAILURE)
|
|
goto nothing_aborted;
|
|
|
|
#ifndef GST_DISABLE_GST_DEBUG
|
|
old_state = GST_STATE (element);
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
|
|
"aborting state from %s to %s", gst_element_state_get_name (old_state),
|
|
gst_element_state_get_name (pending));
|
|
#endif
|
|
|
|
/* flag error */
|
|
GST_STATE_RETURN (element) = GST_STATE_CHANGE_FAILURE;
|
|
|
|
GST_STATE_BROADCAST (element);
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
return;
|
|
|
|
nothing_aborted:
|
|
{
|
|
GST_OBJECT_UNLOCK (element);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_continue_state:
|
|
* @element: a #GstElement to continue the state change of.
|
|
* @ret: The previous state return value
|
|
*
|
|
* Commit the state change of the element and proceed to the next
|
|
* pending state if any. This function is used
|
|
* by elements that do asynchronous state changes.
|
|
* The core will normally call this method automatically when an
|
|
* element returned SUCCESS from the state change function.
|
|
* Elements that return ASYNC from the change_state function should
|
|
* eventually call this method from the streaming thread to signal
|
|
* successfull state change completion.
|
|
*
|
|
* If after calling this method the element still has not reached
|
|
* the pending state, the next state change is performed.
|
|
*
|
|
* Returns: The result of the commit state change.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstStateChangeReturn
|
|
gst_element_continue_state (GstElement * element, GstStateChangeReturn ret)
|
|
{
|
|
GstState pending;
|
|
GstState old_ret, old_state, old_next;
|
|
GstState current, next;
|
|
GstMessage *message;
|
|
GstStateChange transition;
|
|
|
|
GST_OBJECT_LOCK (element);
|
|
old_ret = GST_STATE_RETURN (element);
|
|
GST_STATE_RETURN (element) = ret;
|
|
pending = GST_STATE_PENDING (element);
|
|
|
|
/* check if there is something to commit */
|
|
if (pending == GST_STATE_VOID_PENDING)
|
|
goto nothing_pending;
|
|
|
|
old_state = GST_STATE (element);
|
|
/* this is the state we should go to next */
|
|
old_next = GST_STATE_NEXT (element);
|
|
/* update current state */
|
|
current = GST_STATE (element) = old_next;
|
|
|
|
/* see if we reached the final state */
|
|
if (pending == current)
|
|
goto complete;
|
|
|
|
next = GST_STATE_GET_NEXT (current, pending);
|
|
transition = GST_STATE_TRANSITION (current, next);
|
|
|
|
GST_STATE_NEXT (element) = next;
|
|
/* mark busy */
|
|
GST_STATE_RETURN (element) = GST_STATE_CHANGE_ASYNC;
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
|
|
"committing state from %s to %s, pending %s",
|
|
gst_element_state_get_name (old_state),
|
|
gst_element_state_get_name (old_next),
|
|
gst_element_state_get_name (pending));
|
|
|
|
message = gst_message_new_state_changed (GST_OBJECT (element),
|
|
old_state, old_next, pending);
|
|
gst_element_post_message (element, message);
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
|
|
"continue state change %s to %s, final %s",
|
|
gst_element_state_get_name (current),
|
|
gst_element_state_get_name (next), gst_element_state_get_name (pending));
|
|
|
|
ret = gst_element_change_state (element, transition);
|
|
|
|
return ret;
|
|
|
|
nothing_pending:
|
|
{
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element, "nothing pending");
|
|
GST_OBJECT_UNLOCK (element);
|
|
return ret;
|
|
}
|
|
complete:
|
|
{
|
|
GST_STATE_PENDING (element) = GST_STATE_VOID_PENDING;
|
|
GST_STATE_NEXT (element) = GST_STATE_VOID_PENDING;
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element, "completed state change");
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
/* don't post silly messages with the same state. This can happen
|
|
* when an element state is changed to what it already was. For bins
|
|
* this can be the result of a lost state, which we check with the
|
|
* previous return value.
|
|
* We do signal the cond though as a _get_state() might be blocking
|
|
* on it. */
|
|
if (old_state != old_next || old_ret == GST_STATE_CHANGE_ASYNC) {
|
|
message = gst_message_new_state_changed (GST_OBJECT (element),
|
|
old_state, old_next, GST_STATE_VOID_PENDING);
|
|
gst_element_post_message (element, message);
|
|
}
|
|
|
|
GST_STATE_BROADCAST (element);
|
|
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_lost_state:
|
|
* @element: a #GstElement the state is lost of
|
|
*
|
|
* Brings the element to the lost state. The current state of the
|
|
* element is copied to the pending state so that any call to
|
|
* gst_element_get_state() will return ASYNC.
|
|
*
|
|
* This is mostly used for elements that lost their preroll buffer
|
|
* in the PAUSED state after a flush, they become PAUSED again
|
|
* if a new preroll buffer is queued.
|
|
* This function can only be called when the element is currently
|
|
* not in error or an async state change.
|
|
*
|
|
* This function can only be called with the STATE_LOCK held.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
void
|
|
gst_element_lost_state (GstElement * element)
|
|
{
|
|
GstState current_state;
|
|
GstMessage *message;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
GST_OBJECT_LOCK (element);
|
|
if (GST_STATE_PENDING (element) != GST_STATE_VOID_PENDING ||
|
|
GST_STATE_RETURN (element) == GST_STATE_CHANGE_FAILURE)
|
|
goto nothing_lost;
|
|
|
|
current_state = GST_STATE (element);
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"lost state of %s", gst_element_state_get_name (current_state));
|
|
|
|
GST_STATE_NEXT (element) = current_state;
|
|
GST_STATE_PENDING (element) = current_state;
|
|
GST_STATE_RETURN (element) = GST_STATE_CHANGE_ASYNC;
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
message = gst_message_new_state_changed (GST_OBJECT (element),
|
|
current_state, current_state, current_state);
|
|
gst_element_post_message (element, message);
|
|
|
|
/* and mark us dirty */
|
|
message = gst_message_new_state_dirty (GST_OBJECT (element));
|
|
gst_element_post_message (element, message);
|
|
|
|
return;
|
|
|
|
nothing_lost:
|
|
{
|
|
GST_OBJECT_UNLOCK (element);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_state:
|
|
* @element: a #GstElement to change state of.
|
|
* @state: the element's new #GstState.
|
|
*
|
|
* Sets the state of the element. This function will try to set the
|
|
* requested state by going through all the intermediary states and calling
|
|
* the class's state change function for each.
|
|
*
|
|
* This function can return #GST_STATE_CHANGE_ASYNC, in which case the
|
|
* element will perform the remainder of the state change asynchronously in
|
|
* another thread.
|
|
* An application can use gst_element_get_state() to wait for the completion
|
|
* of the state change or it can wait for a state change message on the bus.
|
|
*
|
|
* Returns: Result of the state change using #GstStateChangeReturn.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstStateChangeReturn
|
|
gst_element_set_state (GstElement * element, GstState state)
|
|
{
|
|
GstElementClass *oclass;
|
|
GstStateChangeReturn result = GST_STATE_CHANGE_FAILURE;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), GST_STATE_CHANGE_FAILURE);
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->set_state)
|
|
result = (oclass->set_state) (element, state);
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* default set state function, calculates the next state based
|
|
* on current state and calls the change_state function
|
|
*/
|
|
static GstStateChangeReturn
|
|
gst_element_set_state_func (GstElement * element, GstState state)
|
|
{
|
|
GstState current, next, old_pending;
|
|
GstStateChangeReturn ret;
|
|
GstStateChange transition;
|
|
GstStateChangeReturn old_ret;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), GST_STATE_CHANGE_FAILURE);
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element, "set_state to %s",
|
|
gst_element_state_get_name (state));
|
|
|
|
/* state lock is taken to protect the set_state() and get_state()
|
|
* procedures, it does not lock any variables. */
|
|
GST_STATE_LOCK (element);
|
|
|
|
/* now calculate how to get to the new state */
|
|
GST_OBJECT_LOCK (element);
|
|
old_ret = GST_STATE_RETURN (element);
|
|
/* previous state change returned an error, remove all pending
|
|
* and next states */
|
|
if (old_ret == GST_STATE_CHANGE_FAILURE) {
|
|
GST_STATE_NEXT (element) = GST_STATE_VOID_PENDING;
|
|
GST_STATE_PENDING (element) = GST_STATE_VOID_PENDING;
|
|
GST_STATE_RETURN (element) = GST_STATE_CHANGE_SUCCESS;
|
|
}
|
|
|
|
current = GST_STATE (element);
|
|
next = GST_STATE_NEXT (element);
|
|
old_pending = GST_STATE_PENDING (element);
|
|
element->state_cookie++;
|
|
|
|
/* this is the (new) state we should go to */
|
|
GST_STATE_PENDING (element) = state;
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"current %s, old_pending %s, next %s, old return %d",
|
|
gst_element_state_get_name (current),
|
|
gst_element_state_get_name (old_pending),
|
|
gst_element_state_get_name (next), old_ret);
|
|
|
|
/* if the element was busy doing a state change, we just update the
|
|
* target state, it'll get to it async then. */
|
|
if (old_pending != GST_STATE_VOID_PENDING) {
|
|
/* upwards state change will happen ASYNC */
|
|
if (old_pending <= state)
|
|
goto was_busy;
|
|
/* element is going to this state already */
|
|
else if (next == state)
|
|
goto was_busy;
|
|
/* element was performing an ASYNC upward state change and
|
|
* we request to go downward again. Start from the next pending
|
|
* state then. */
|
|
else if (next > state
|
|
&& GST_STATE_RETURN (element) == GST_STATE_CHANGE_ASYNC) {
|
|
current = next;
|
|
}
|
|
}
|
|
next = GST_STATE_GET_NEXT (current, state);
|
|
/* now we store the next state */
|
|
GST_STATE_NEXT (element) = next;
|
|
/* mark busy, we need to check that there is actually a state change
|
|
* to be done else we could accidentally override SUCCESS/NO_PREROLL and
|
|
* the default element change_state function has no way to know what the
|
|
* old value was... could consider this a FIXME...*/
|
|
if (current != next)
|
|
GST_STATE_RETURN (element) = GST_STATE_CHANGE_ASYNC;
|
|
|
|
transition = GST_STATE_TRANSITION (current, next);
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"%s: setting state from %s to %s",
|
|
(next != state ? "intermediate" : "final"),
|
|
gst_element_state_get_name (current), gst_element_state_get_name (next));
|
|
|
|
/* now signal any waiters, they will error since the cookie was increased */
|
|
GST_STATE_BROADCAST (element);
|
|
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
ret = gst_element_change_state (element, transition);
|
|
|
|
GST_STATE_UNLOCK (element);
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element, "returned %d", ret);
|
|
|
|
return ret;
|
|
|
|
was_busy:
|
|
{
|
|
GST_STATE_RETURN (element) = GST_STATE_CHANGE_ASYNC;
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"element was busy with async state change");
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
GST_STATE_UNLOCK (element);
|
|
|
|
return GST_STATE_CHANGE_ASYNC;
|
|
}
|
|
}
|
|
|
|
/* with STATE_LOCK */
|
|
static GstStateChangeReturn
|
|
gst_element_change_state (GstElement * element, GstStateChange transition)
|
|
{
|
|
GstElementClass *oclass;
|
|
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
|
|
GstState current;
|
|
GstState next;
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
/* start with the current state. */
|
|
current = GST_STATE_TRANSITION_CURRENT (transition);
|
|
next = GST_STATE_TRANSITION_NEXT (transition);
|
|
|
|
/* call the state change function so it can set the state */
|
|
if (oclass->change_state)
|
|
ret = (oclass->change_state) (element, transition);
|
|
else
|
|
ret = GST_STATE_CHANGE_FAILURE;
|
|
|
|
switch (ret) {
|
|
case GST_STATE_CHANGE_FAILURE:
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
|
|
"have FAILURE change_state return");
|
|
/* state change failure */
|
|
gst_element_abort_state (element);
|
|
break;
|
|
case GST_STATE_CHANGE_ASYNC:
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"element will change state ASYNC");
|
|
|
|
/* if we go upwards, we give the app a change to wait for
|
|
* completion */
|
|
if (current < next)
|
|
goto async;
|
|
|
|
/* else we just continue the state change downwards */
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
|
|
"forcing commit state %s < %s",
|
|
gst_element_state_get_name (current),
|
|
gst_element_state_get_name (next));
|
|
|
|
ret = gst_element_continue_state (element, GST_STATE_CHANGE_SUCCESS);
|
|
break;
|
|
case GST_STATE_CHANGE_SUCCESS:
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"element changed state SUCCESS");
|
|
/* we can commit the state now which will proceeed to
|
|
* the next state */
|
|
ret = gst_element_continue_state (element, ret);
|
|
break;
|
|
case GST_STATE_CHANGE_NO_PREROLL:
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"element changed state NO_PREROLL");
|
|
/* we can commit the state now which will proceeed to
|
|
* the next state */
|
|
ret = gst_element_continue_state (element, ret);
|
|
break;
|
|
default:
|
|
goto invalid_return;
|
|
}
|
|
|
|
GST_CAT_LOG_OBJECT (GST_CAT_STATES, element, "exit state change %d", ret);
|
|
|
|
return ret;
|
|
|
|
async:
|
|
GST_CAT_LOG_OBJECT (GST_CAT_STATES, element, "exit async state change %d",
|
|
ret);
|
|
|
|
return ret;
|
|
|
|
/* ERROR */
|
|
invalid_return:
|
|
{
|
|
GST_OBJECT_LOCK (element);
|
|
/* somebody added a GST_STATE_ and forgot to do stuff here ! */
|
|
g_critical ("%s: unknown return value %d from a state change function",
|
|
GST_ELEMENT_NAME (element), ret);
|
|
|
|
ret = GST_STATE_CHANGE_FAILURE;
|
|
GST_STATE_RETURN (element) = ret;
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/* gst_iterator_fold functions for pads_activate */
|
|
|
|
static gboolean
|
|
activate_pads (GstPad * pad, GValue * ret, gboolean * active)
|
|
{
|
|
if (!gst_pad_set_active (pad, *active))
|
|
g_value_set_boolean (ret, FALSE);
|
|
else if (!*active)
|
|
gst_pad_set_caps (pad, NULL);
|
|
|
|
gst_object_unref (pad);
|
|
return TRUE;
|
|
}
|
|
|
|
/* returns false on error or early cutout of the fold, true otherwise */
|
|
static gboolean
|
|
iterator_fold_with_resync (GstIterator * iter, GstIteratorFoldFunction func,
|
|
GValue * ret, gpointer user_data)
|
|
{
|
|
GstIteratorResult ires;
|
|
gboolean res = TRUE;
|
|
|
|
while (1) {
|
|
ires = gst_iterator_fold (iter, func, ret, user_data);
|
|
|
|
switch (ires) {
|
|
case GST_ITERATOR_RESYNC:
|
|
gst_iterator_resync (iter);
|
|
break;
|
|
case GST_ITERATOR_DONE:
|
|
res = TRUE;
|
|
goto done;
|
|
default:
|
|
res = FALSE;
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
done:
|
|
return res;
|
|
}
|
|
|
|
/* is called with STATE_LOCK
|
|
*/
|
|
static gboolean
|
|
gst_element_pads_activate (GstElement * element, gboolean active)
|
|
{
|
|
GValue ret = { 0, };
|
|
GstIterator *iter;
|
|
gboolean fold_ok;
|
|
|
|
GST_DEBUG_OBJECT (element, "pads_activate with active %d", active);
|
|
/* no need to unset this later, it's just a boolean */
|
|
g_value_init (&ret, G_TYPE_BOOLEAN);
|
|
g_value_set_boolean (&ret, TRUE);
|
|
|
|
if (active)
|
|
iter = gst_element_iterate_src_pads (element);
|
|
else
|
|
iter = gst_element_iterate_sink_pads (element);
|
|
fold_ok = iterator_fold_with_resync
|
|
(iter, (GstIteratorFoldFunction) activate_pads, &ret, &active);
|
|
gst_iterator_free (iter);
|
|
if (!fold_ok || !g_value_get_boolean (&ret)) {
|
|
GST_DEBUG_OBJECT (element, "pads_activate failed");
|
|
return FALSE;
|
|
}
|
|
|
|
if (active)
|
|
iter = gst_element_iterate_sink_pads (element);
|
|
else
|
|
iter = gst_element_iterate_src_pads (element);
|
|
fold_ok = iterator_fold_with_resync
|
|
(iter, (GstIteratorFoldFunction) activate_pads, &ret, &active);
|
|
gst_iterator_free (iter);
|
|
if (!fold_ok || !g_value_get_boolean (&ret)) {
|
|
GST_DEBUG_OBJECT (element, "pads_activate failed");
|
|
return FALSE;
|
|
}
|
|
|
|
GST_DEBUG_OBJECT (element, "pads_activate successful");
|
|
return TRUE;
|
|
}
|
|
|
|
/* is called with STATE_LOCK */
|
|
static GstStateChangeReturn
|
|
gst_element_change_state_func (GstElement * element, GstStateChange transition)
|
|
{
|
|
GstState state, next;
|
|
GstStateChangeReturn result = GST_STATE_CHANGE_SUCCESS;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), GST_STATE_CHANGE_FAILURE);
|
|
|
|
state = GST_STATE_TRANSITION_CURRENT (transition);
|
|
next = GST_STATE_TRANSITION_NEXT (transition);
|
|
|
|
/* if the element already is in the given state, we just return success */
|
|
if (next == GST_STATE_VOID_PENDING || state == next)
|
|
goto was_ok;
|
|
|
|
GST_CAT_LOG_OBJECT (GST_CAT_STATES, element,
|
|
"default handler tries setting state from %s to %s (%04x)",
|
|
gst_element_state_get_name (state),
|
|
gst_element_state_get_name (next), transition);
|
|
|
|
switch (transition) {
|
|
case GST_STATE_CHANGE_NULL_TO_READY:
|
|
break;
|
|
case GST_STATE_CHANGE_READY_TO_PAUSED:
|
|
if (!gst_element_pads_activate (element, TRUE)) {
|
|
result = GST_STATE_CHANGE_FAILURE;
|
|
}
|
|
break;
|
|
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
|
|
break;
|
|
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
|
|
break;
|
|
case GST_STATE_CHANGE_PAUSED_TO_READY:
|
|
case GST_STATE_CHANGE_READY_TO_NULL:
|
|
/* deactivate pads in both cases, since they are activated on
|
|
ready->paused but the element might not have made it to paused */
|
|
if (!gst_element_pads_activate (element, FALSE)) {
|
|
result = GST_STATE_CHANGE_FAILURE;
|
|
} else {
|
|
gst_element_set_base_time (element, 0);
|
|
}
|
|
break;
|
|
default:
|
|
/* this will catch real but unhandled state changes;
|
|
* can only be caused by:
|
|
* - a new state was added
|
|
* - somehow the element was asked to jump across an intermediate state
|
|
*/
|
|
g_warning ("Unhandled state change from %s to %s",
|
|
gst_element_state_get_name (state),
|
|
gst_element_state_get_name (next));
|
|
break;
|
|
}
|
|
return result;
|
|
|
|
was_ok:
|
|
{
|
|
GST_OBJECT_LOCK (element);
|
|
result = GST_STATE_RETURN (element);
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"element is already in the %s state",
|
|
gst_element_state_get_name (state));
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
return result;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_factory:
|
|
* @element: a #GstElement to request the element factory of.
|
|
*
|
|
* Retrieves the factory that was used to create this element.
|
|
*
|
|
* Returns: the #GstElementFactory used for creating this element.
|
|
* no refcounting is needed.
|
|
*/
|
|
GstElementFactory *
|
|
gst_element_get_factory (GstElement * element)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
return GST_ELEMENT_GET_CLASS (element)->elementfactory;
|
|
}
|
|
|
|
static void
|
|
gst_element_dispose (GObject * object)
|
|
{
|
|
GstElement *element = GST_ELEMENT (object);
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_REFCOUNTING, element, "dispose");
|
|
|
|
if (GST_STATE (element) != GST_STATE_NULL) {
|
|
g_critical
|
|
("\nTrying to dispose element %s, but it is not in the NULL state.\n"
|
|
"You need to explicitly set elements to the NULL state before\n"
|
|
"dropping the final reference, to allow them to clean up.\n",
|
|
GST_OBJECT_NAME (element));
|
|
return;
|
|
}
|
|
g_return_if_fail (GST_STATE_PENDING (element) == GST_STATE_VOID_PENDING);
|
|
|
|
GST_DEBUG ("removing %d pads", g_list_length (element->pads));
|
|
/* first we break all our links with the outside */
|
|
while (element->pads && element->pads->data) {
|
|
/* don't call _remove_pad with NULL */
|
|
gst_element_remove_pad (element, GST_PAD_CAST (element->pads->data));
|
|
}
|
|
if (G_UNLIKELY (element->pads != 0)) {
|
|
g_critical ("could not remove pads from element %s",
|
|
GST_STR_NULL (GST_OBJECT_NAME (object)));
|
|
}
|
|
|
|
GST_OBJECT_LOCK (element);
|
|
gst_object_replace ((GstObject **) & element->clock, NULL);
|
|
gst_object_replace ((GstObject **) & element->bus, NULL);
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_REFCOUNTING, element, "parent class dispose");
|
|
|
|
G_OBJECT_CLASS (parent_class)->dispose (object);
|
|
}
|
|
|
|
static void
|
|
gst_element_finalize (GObject * object)
|
|
{
|
|
GstElement *element = GST_ELEMENT (object);
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_REFCOUNTING, element, "finalize");
|
|
|
|
GST_STATE_LOCK (element);
|
|
if (element->state_cond)
|
|
g_cond_free (element->state_cond);
|
|
element->state_cond = NULL;
|
|
GST_STATE_UNLOCK (element);
|
|
g_static_rec_mutex_free (element->state_lock);
|
|
g_free (element->state_lock);
|
|
element->state_lock = NULL;
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_REFCOUNTING, element, "finalize parent");
|
|
|
|
G_OBJECT_CLASS (parent_class)->finalize (object);
|
|
}
|
|
|
|
#ifndef GST_DISABLE_LOADSAVE
|
|
/**
|
|
* gst_element_save_thyself:
|
|
* @element: a #GstElement to save.
|
|
* @parent: the xml parent node.
|
|
*
|
|
* Saves the element as part of the given XML structure.
|
|
*
|
|
* Returns: the new #xmlNodePtr.
|
|
*/
|
|
static xmlNodePtr
|
|
gst_element_save_thyself (GstObject * object, xmlNodePtr parent)
|
|
{
|
|
GList *pads;
|
|
GstElementClass *oclass;
|
|
GParamSpec **specs, *spec;
|
|
guint nspecs;
|
|
guint i;
|
|
GValue value = { 0, };
|
|
GstElement *element;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (object), parent);
|
|
|
|
element = GST_ELEMENT (object);
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
xmlNewChild (parent, NULL, (xmlChar *) "name",
|
|
(xmlChar *) GST_ELEMENT_NAME (element));
|
|
|
|
if (oclass->elementfactory != NULL) {
|
|
GstElementFactory *factory = (GstElementFactory *) oclass->elementfactory;
|
|
|
|
xmlNewChild (parent, NULL, (xmlChar *) "type",
|
|
(xmlChar *) GST_PLUGIN_FEATURE (factory)->name);
|
|
}
|
|
|
|
/* params */
|
|
specs = g_object_class_list_properties (G_OBJECT_GET_CLASS (object), &nspecs);
|
|
|
|
for (i = 0; i < nspecs; i++) {
|
|
spec = specs[i];
|
|
if (spec->flags & G_PARAM_READABLE) {
|
|
xmlNodePtr param;
|
|
char *contents;
|
|
|
|
g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (spec));
|
|
|
|
g_object_get_property (G_OBJECT (element), spec->name, &value);
|
|
param = xmlNewChild (parent, NULL, (xmlChar *) "param", NULL);
|
|
xmlNewChild (param, NULL, (xmlChar *) "name", (xmlChar *) spec->name);
|
|
|
|
if (G_IS_PARAM_SPEC_STRING (spec))
|
|
contents = g_value_dup_string (&value);
|
|
else if (G_IS_PARAM_SPEC_ENUM (spec))
|
|
contents = g_strdup_printf ("%d", g_value_get_enum (&value));
|
|
else if (G_IS_PARAM_SPEC_INT64 (spec))
|
|
contents = g_strdup_printf ("%" G_GINT64_FORMAT,
|
|
g_value_get_int64 (&value));
|
|
else
|
|
contents = g_strdup_value_contents (&value);
|
|
|
|
xmlNewChild (param, NULL, (xmlChar *) "value", (xmlChar *) contents);
|
|
g_free (contents);
|
|
|
|
g_value_unset (&value);
|
|
}
|
|
}
|
|
|
|
g_free (specs);
|
|
|
|
pads = GST_ELEMENT_PADS (element);
|
|
|
|
while (pads) {
|
|
GstPad *pad = GST_PAD (pads->data);
|
|
|
|
/* figure out if it's a direct pad or a ghostpad */
|
|
if (GST_ELEMENT (GST_OBJECT_PARENT (pad)) == element) {
|
|
xmlNodePtr padtag = xmlNewChild (parent, NULL, (xmlChar *) "pad", NULL);
|
|
|
|
gst_object_save_thyself (GST_OBJECT (pad), padtag);
|
|
}
|
|
pads = g_list_next (pads);
|
|
}
|
|
|
|
return parent;
|
|
}
|
|
|
|
static void
|
|
gst_element_restore_thyself (GstObject * object, xmlNodePtr self)
|
|
{
|
|
xmlNodePtr children;
|
|
GstElement *element;
|
|
gchar *name = NULL;
|
|
gchar *value = NULL;
|
|
|
|
element = GST_ELEMENT (object);
|
|
g_return_if_fail (element != NULL);
|
|
|
|
/* parameters */
|
|
children = self->xmlChildrenNode;
|
|
while (children) {
|
|
if (!strcmp ((char *) children->name, "param")) {
|
|
xmlNodePtr child = children->xmlChildrenNode;
|
|
|
|
while (child) {
|
|
if (!strcmp ((char *) child->name, "name")) {
|
|
name = (gchar *) xmlNodeGetContent (child);
|
|
} else if (!strcmp ((char *) child->name, "value")) {
|
|
value = (gchar *) xmlNodeGetContent (child);
|
|
}
|
|
child = child->next;
|
|
}
|
|
/* FIXME: can this just be g_object_set ? */
|
|
gst_util_set_object_arg (G_OBJECT (element), name, value);
|
|
/* g_object_set (G_OBJECT (element), name, value, NULL); */
|
|
g_free (name);
|
|
g_free (value);
|
|
}
|
|
children = children->next;
|
|
}
|
|
|
|
/* pads */
|
|
children = self->xmlChildrenNode;
|
|
while (children) {
|
|
if (!strcmp ((char *) children->name, "pad")) {
|
|
gst_pad_load_and_link (children, GST_OBJECT (element));
|
|
}
|
|
children = children->next;
|
|
}
|
|
|
|
if (GST_OBJECT_CLASS (parent_class)->restore_thyself)
|
|
(GST_OBJECT_CLASS (parent_class)->restore_thyself) (object, self);
|
|
}
|
|
#endif /* GST_DISABLE_LOADSAVE */
|
|
|
|
static void
|
|
gst_element_set_bus_func (GstElement * element, GstBus * bus)
|
|
{
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PARENTAGE, element, "setting bus to %p", bus);
|
|
|
|
GST_OBJECT_LOCK (element);
|
|
gst_object_replace ((GstObject **) & GST_ELEMENT_BUS (element),
|
|
GST_OBJECT_CAST (bus));
|
|
GST_OBJECT_UNLOCK (element);
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_bus:
|
|
* @element: a #GstElement to set the bus of.
|
|
* @bus: the #GstBus to set.
|
|
*
|
|
* Sets the bus of the element. For internal use only, unless you're
|
|
* testing elements.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
void
|
|
gst_element_set_bus (GstElement * element, GstBus * bus)
|
|
{
|
|
GstElementClass *oclass;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->set_bus)
|
|
oclass->set_bus (element, bus);
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_bus:
|
|
* @element: a #GstElement to get the bus of.
|
|
*
|
|
* Returns the bus of the element.
|
|
*
|
|
* Returns: the element's #GstBus. unref after usage.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstBus *
|
|
gst_element_get_bus (GstElement * element)
|
|
{
|
|
GstBus *result = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), result);
|
|
|
|
GST_OBJECT_LOCK (element);
|
|
result = GST_ELEMENT_BUS (element);
|
|
gst_object_ref (result);
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
GST_DEBUG_OBJECT (element, "got bus %" GST_PTR_FORMAT, result);
|
|
|
|
return result;
|
|
}
|