mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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a1daf846f3
Conflicts: gst/gstobject.h libs/gst/check/gstcheck.h libs/gst/controller/gstcontroller.c plugins/elements/gstidentity.c tools/gst-xmlinspect.c
2885 lines
85 KiB
C
2885 lines
85 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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* An existing pad of an element can be retrieved by name with
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* gst_element_get_static_pad(). A new dynamic pad can be created using
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* gst_element_request_pad() with a #GstPadTemplate or
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* gst_element_get_request_pad() with the template name such as "src_\%d".
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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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* Setting a state triggers a #GstStateChange. To get a string representation
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* of a #GstState, use 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 2009-05-29 (0.10.24)
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*/
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/* FIXME 0.11: suppress warnings for deprecated API such as GStaticRecMutex
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* with newer GLib versions (>= 2.31.0) */
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#define GLIB_DISABLE_DEPRECATION_WARNINGS
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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 "gstelementmetadata.h"
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#include "gstenumtypes.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 "gstvalue.h"
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#include "gst-i18n-lib.h"
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#include "glib-compat-private.h"
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/* Element signals and args */
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enum
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{
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PAD_ADDED,
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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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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_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 gboolean gst_element_set_clock_func (GstElement * element,
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GstClock * clock);
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static void gst_element_set_bus_func (GstElement * element, GstBus * bus);
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static gboolean gst_element_default_send_event (GstElement * element,
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GstEvent * event);
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static gboolean gst_element_default_query (GstElement * element,
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GstQuery * query);
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static GstPadTemplate
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* gst_element_class_get_request_pad_template (GstElementClass *
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element_class, const gchar * name);
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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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/* this is used in gstelementfactory.c:gst_element_register() */
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GQuark __gst_elementclass_factory = 0;
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GType
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gst_element_get_type (void)
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{
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static volatile gsize gst_element_type = 0;
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if (g_once_init_enter (&gst_element_type)) {
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GType _type;
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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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_type = g_type_register_static (GST_TYPE_OBJECT, "GstElement",
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&element_info, G_TYPE_FLAG_ABSTRACT);
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__gst_elementclass_factory =
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g_quark_from_static_string ("GST_ELEMENTCLASS_FACTORY");
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g_once_init_leave (&gst_element_type, _type);
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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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gobject_class = (GObjectClass *) klass;
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parent_class = g_type_class_peek_parent (klass);
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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. Note that this signal will
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* usually be emitted from the context of the streaming thread. Also keep in
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* mind that if you add new elements to the pipeline in the signal handler
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* you will need to set them to the desired target state with
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* gst_element_set_state() or gst_element_sync_state_with_parent().
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*/
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gst_element_signals[PAD_ADDED] =
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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, GST_TYPE_PAD);
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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, GST_TYPE_PAD);
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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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* Note that this signal will usually be emitted from the context of
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* the streaming thread.
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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_element_dispose;
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gobject_class->finalize = gst_element_finalize;
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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_clock = GST_DEBUG_FUNCPTR (gst_element_set_clock_func);
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klass->set_bus = GST_DEBUG_FUNCPTR (gst_element_set_bus_func);
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klass->query = GST_DEBUG_FUNCPTR (gst_element_default_query);
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klass->send_event = GST_DEBUG_FUNCPTR (gst_element_default_send_event);
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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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GList *node, *padtemplates;
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/* Copy the element details here so elements can inherit the
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* details from their base class and classes only need to set
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* the details in class_init instead of base_init */
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element_class->metadata =
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element_class->metadata ? gst_structure_copy (element_class->metadata) :
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gst_structure_new_empty ("metadata");
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/* Copy the pad templates so elements inherit them
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* from their base class but elements can add pad templates in class_init
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* instead of base_init.
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*/
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padtemplates = g_list_copy (element_class->padtemplates);
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for (node = padtemplates; node != NULL; node = node->next) {
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GstPadTemplate *tmpl = (GstPadTemplate *) node->data;
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gst_object_ref (tmpl);
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}
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element_class->padtemplates = padtemplates;
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/* set the factory, see gst_element_register() */
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element_class->elementfactory =
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g_type_get_qdata (G_TYPE_FROM_CLASS (element_class),
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__gst_elementclass_factory);
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GST_DEBUG ("type %s : factory %p", G_OBJECT_CLASS_NAME (element_class),
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element_class->elementfactory);
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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_structure_free (klass->metadata);
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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_TARGET (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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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_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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* This does not unref the pad. If the pad was created by using
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* gst_element_get_request_pad(), gst_element_release_request_pad() needs to be
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* followed by gst_object_unref() to free the @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 the element implements a custom release function we call that, else we
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* simply remove the pad from the 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_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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* <note>An element is only required to provide a clock in the PAUSED
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* state. Some elements can provide a clock in other states.</note>
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*
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* Returns: (transfer full): 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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static gboolean
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gst_element_set_clock_func (GstElement * element, GstClock * clock)
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{
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GstClock **clock_p;
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GST_OBJECT_LOCK (element);
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clock_p = &element->clock;
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gst_object_replace ((GstObject **) clock_p, (GstObject *) clock);
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GST_OBJECT_UNLOCK (element);
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return TRUE;
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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. An element can refuse a
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* clock when it, for example, is not able to slave its internal clock to the
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* @clock or when it requires a specific clock to operate.
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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 = FALSE;
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g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
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g_return_val_if_fail (clock == NULL || GST_IS_CLOCK (clock), FALSE);
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oclass = GST_ELEMENT_GET_CLASS (element);
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GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, 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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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. This is the clock as was
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* last set with gst_element_set_clock().
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*
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* Returns: (transfer full): 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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*/
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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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GstClockTime old;
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g_return_if_fail (GST_IS_ELEMENT (element));
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GST_OBJECT_LOCK (element);
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old = element->base_time;
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element->base_time = time;
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GST_OBJECT_UNLOCK (element);
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GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, element,
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"set base_time=%" GST_TIME_FORMAT ", old %" GST_TIME_FORMAT,
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GST_TIME_ARGS (time), GST_TIME_ARGS (old));
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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
|
|
* absolute time of the clock when this element was last put to
|
|
* PLAYING. Subtracting the base time from the clock time gives
|
|
* the running 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;
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_start_time:
|
|
* @element: a #GstElement.
|
|
* @time: the base time to set.
|
|
*
|
|
* Set the start time of an element. The start time of the element is the
|
|
* running time of the element when it last went to the PAUSED state. In READY
|
|
* or after a flushing seek, it is set to 0.
|
|
*
|
|
* Toplevel elements like #GstPipeline will manage the start_time and
|
|
* base_time on its children. Setting the start_time to #GST_CLOCK_TIME_NONE
|
|
* on such a toplevel element will disable the distribution of the base_time to
|
|
* the children and can be useful if the application manages the base_time
|
|
* itself, for example if you want to synchronize capture from multiple
|
|
* pipelines, and you can also ensure that the pipelines have the same clock.
|
|
*
|
|
* MT safe.
|
|
*
|
|
* Since: 0.10.24
|
|
*/
|
|
void
|
|
gst_element_set_start_time (GstElement * element, GstClockTime time)
|
|
{
|
|
GstClockTime old;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
GST_OBJECT_LOCK (element);
|
|
old = GST_ELEMENT_START_TIME (element);
|
|
GST_ELEMENT_START_TIME (element) = time;
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, element,
|
|
"set start_time=%" GST_TIME_FORMAT ", old %" GST_TIME_FORMAT,
|
|
GST_TIME_ARGS (time), GST_TIME_ARGS (old));
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_start_time:
|
|
* @element: a #GstElement.
|
|
*
|
|
* Returns the start time of the element. The start time is the
|
|
* running time of the clock when this element was last put to PAUSED.
|
|
*
|
|
* Usually the start_time is managed by a toplevel element such as
|
|
* #GstPipeline.
|
|
*
|
|
* MT safe.
|
|
*
|
|
* Returns: the start time of the element.
|
|
*
|
|
* Since: 0.10.24
|
|
*/
|
|
GstClockTime
|
|
gst_element_get_start_time (GstElement * element)
|
|
{
|
|
GstClockTime result;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), GST_CLOCK_TIME_NONE);
|
|
|
|
GST_OBJECT_LOCK (element);
|
|
result = GST_ELEMENT_START_TIME (element);
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_index:
|
|
* @element: a #GstElement.
|
|
* @index: (transfer none): 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 (index == NULL || 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: (transfer full): 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;
|
|
GstIndex *result = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->get_index)
|
|
result = oclass->get_index (element);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_add_pad:
|
|
* @element: a #GstElement to add the pad to.
|
|
* @pad: (transfer full): 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. See gst_pad_set_active() for more information about activating pads.
|
|
*
|
|
* The pad and the element should be unlocked when calling this function.
|
|
*
|
|
* This function will emit the #GstElement::pad-added signal on the element.
|
|
*
|
|
* 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;
|
|
gboolean flushing;
|
|
|
|
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));
|
|
flushing = GST_PAD_IS_FLUSHING (pad);
|
|
GST_OBJECT_FLAG_SET (pad, GST_PAD_FLAG_NEED_PARENT);
|
|
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;
|
|
|
|
/* check for flushing pads */
|
|
if (flushing && (GST_STATE (element) > GST_STATE_READY ||
|
|
GST_STATE_NEXT (element) == GST_STATE_PAUSED)) {
|
|
g_warning ("adding flushing pad '%s' to running element '%s', you need to "
|
|
"use gst_pad_set_active(pad,TRUE) before adding it.",
|
|
GST_STR_NULL (pad_name), GST_ELEMENT_NAME (element));
|
|
/* unset flushing */
|
|
GST_OBJECT_LOCK (pad);
|
|
GST_PAD_UNSET_FLUSHING (pad);
|
|
GST_OBJECT_UNLOCK (pad);
|
|
}
|
|
|
|
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 PAD_ADDED signal */
|
|
g_signal_emit (element, gst_element_signals[PAD_ADDED], 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: (transfer none): the #GstPad to remove from the element.
|
|
*
|
|
* Removes @pad from @element. @pad will be destroyed if it has not been
|
|
* referenced elsewhere using gst_object_unparent().
|
|
*
|
|
* This function is used by plugin developers and should not be used
|
|
* by applications. Pads that were dynamically requested from elements
|
|
* with gst_element_get_request_pad() should be released with the
|
|
* gst_element_release_request_pad() function instead.
|
|
*
|
|
* Pads are not automatically deactivated so elements should perform the needed
|
|
* steps to deactivate the pad in case this pad is removed in the PAUSED or
|
|
* PLAYING state. See gst_pad_set_active() for more information about
|
|
* deactivating pads.
|
|
*
|
|
* The pad and the element should be unlocked when calling this function.
|
|
*
|
|
* This function will emit the #GstElement::pad-removed signal on the element.
|
|
*
|
|
* Returns: %TRUE if the pad could be removed. Can return %FALSE if the
|
|
* pad does not belong 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);
|
|
|
|
/* emit the PAD_REMOVED signal before unparenting and losing the last ref. */
|
|
g_signal_emit (element, gst_element_signals[PAD_REMOVED], 0, pad);
|
|
|
|
gst_object_unparent (GST_OBJECT_CAST (pad));
|
|
|
|
return TRUE;
|
|
|
|
/* ERRORS */
|
|
not_our_pad:
|
|
{
|
|
/* locking order is element > pad */
|
|
GST_OBJECT_UNLOCK (pad);
|
|
|
|
GST_OBJECT_LOCK (element);
|
|
GST_OBJECT_LOCK (pad);
|
|
g_critical ("Padname %s:%s does not belong to element %s when removing",
|
|
GST_DEBUG_PAD_NAME (pad), GST_ELEMENT_NAME (element));
|
|
GST_OBJECT_UNLOCK (pad);
|
|
GST_OBJECT_UNLOCK (element);
|
|
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.
|
|
*
|
|
* This function emits the #GstElement::no-more-pads signal.
|
|
*
|
|
* 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: (transfer full): 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, const GstCaps * caps)
|
|
{
|
|
GstPad *newpad = NULL;
|
|
GstElementClass *oclass;
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
#ifndef G_DISABLE_CHECKS
|
|
/* Some sanity checking here */
|
|
if (name) {
|
|
GstPad *pad;
|
|
|
|
/* Is this the template name? */
|
|
if (strstr (name, "%") || !strchr (templ->name_template, '%')) {
|
|
g_return_val_if_fail (strcmp (name, templ->name_template) == 0, NULL);
|
|
} else {
|
|
const gchar *str, *data;
|
|
gchar *endptr;
|
|
|
|
/* Otherwise check if it's a valid name for the name template */
|
|
str = strchr (templ->name_template, '%');
|
|
g_return_val_if_fail (str != NULL, NULL);
|
|
g_return_val_if_fail (strncmp (templ->name_template, name,
|
|
str - templ->name_template) == 0, NULL);
|
|
g_return_val_if_fail (strlen (name) > str - templ->name_template, NULL);
|
|
|
|
data = name + (str - templ->name_template);
|
|
|
|
/* Can either be %s or %d or %u, do sanity checking for %d */
|
|
if (*(str + 1) == 'd') {
|
|
gint64 tmp;
|
|
|
|
/* it's an int */
|
|
tmp = g_ascii_strtoll (data, &endptr, 10);
|
|
g_return_val_if_fail (tmp >= G_MININT && tmp <= G_MAXINT
|
|
&& *endptr == '\0', NULL);
|
|
} else if (*(str + 1) == 'u') {
|
|
guint64 tmp;
|
|
|
|
/* it's an int */
|
|
tmp = g_ascii_strtoull (data, &endptr, 10);
|
|
g_return_val_if_fail (tmp <= G_MAXUINT && *endptr == '\0', NULL);
|
|
}
|
|
}
|
|
|
|
pad = gst_element_get_static_pad (element, name);
|
|
if (pad) {
|
|
gst_object_unref (pad);
|
|
/* FIXME 0.11: Change this to g_return_val_if_fail() */
|
|
g_critical ("Element %s already has a pad named %s, the behaviour of "
|
|
" gst_element_get_request_pad() for existing pads is undefined!",
|
|
GST_ELEMENT_NAME (element), name);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (oclass->request_new_pad)
|
|
newpad = (oclass->request_new_pad) (element, templ, name, caps);
|
|
|
|
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 (e.g. "src_\%d"). This version only
|
|
* retrieves request pads. The pad should be released with
|
|
* gst_element_release_request_pad().
|
|
*
|
|
* This method is slow and will be deprecated in the future. New code should
|
|
* use gst_element_request_pad() with the requested template.
|
|
*
|
|
* Returns: (transfer full): requested #GstPad if found, otherwise %NULL.
|
|
* Release 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;
|
|
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 the name contains a %, we assume it's the complete template name. Get
|
|
* the template and try to get a pad */
|
|
if (strstr (name, "%")) {
|
|
templ = gst_element_class_get_request_pad_template (class, name);
|
|
req_name = NULL;
|
|
if (templ)
|
|
templ_found = TRUE;
|
|
} else {
|
|
/* there is no % in the name, try to find a matching template */
|
|
list = class->padtemplates;
|
|
while (!templ_found && list) {
|
|
templ = (GstPadTemplate *) list->data;
|
|
if (templ->presence == GST_PAD_REQUEST) {
|
|
GST_CAT_DEBUG (GST_CAT_PADS, "comparing %s to %s", name,
|
|
templ->name_template);
|
|
/* see if we find an exact match */
|
|
if (strcmp (name, templ->name_template) == 0) {
|
|
templ_found = TRUE;
|
|
req_name = name;
|
|
break;
|
|
}
|
|
/* Because of sanity checks in gst_pad_template_new(), we know that %s
|
|
and %d and %u, occurring at the end of the name_template, are the only
|
|
possibilities. */
|
|
else 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') {
|
|
glong tmp;
|
|
|
|
/* it's an int */
|
|
tmp = strtol (data, &endptr, 10);
|
|
if (tmp != G_MINLONG && tmp != G_MAXLONG && endptr &&
|
|
*endptr == '\0') {
|
|
templ_found = TRUE;
|
|
req_name = name;
|
|
break;
|
|
}
|
|
} else if (*(str + 1) == 'u') {
|
|
gulong tmp;
|
|
|
|
/* it's an int */
|
|
tmp = strtoul (data, &endptr, 10);
|
|
if (tmp != G_MAXULONG && 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, NULL);
|
|
|
|
return pad;
|
|
}
|
|
|
|
/**
|
|
* gst_element_request_pad:
|
|
* @element: a #GstElement to find a request pad of.
|
|
* @templ: a #GstPadTemplate of which we want a pad of.
|
|
* @name: (transfer none) (allow-none): the name of the request #GstPad
|
|
* to retrieve. Can be %NULL.
|
|
* @caps: (transfer none) (allow-none): the caps of the pad we want to
|
|
* request. Can be %NULL.
|
|
*
|
|
* Retrieves a request pad from the element according to the provided template.
|
|
* Pad templates can be looked up using
|
|
* gst_element_factory_get_static_pad_templates().
|
|
*
|
|
* The pad should be released with gst_element_release_request_pad().
|
|
*
|
|
* Returns: (transfer full): requested #GstPad if found, otherwise %NULL.
|
|
* Release after usage.
|
|
*
|
|
* Since: 0.10.32
|
|
*/
|
|
GstPad *
|
|
gst_element_request_pad (GstElement * element,
|
|
GstPadTemplate * templ, const gchar * name, const GstCaps * caps)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
g_return_val_if_fail (templ != NULL, NULL);
|
|
|
|
return _gst_element_request_pad (element, templ, name, caps);
|
|
}
|
|
|
|
static GstIterator *
|
|
gst_element_iterate_pad_list (GstElement * element, GList ** padlist)
|
|
{
|
|
GstIterator *result;
|
|
|
|
GST_OBJECT_LOCK (element);
|
|
result = gst_iterator_new_list (GST_TYPE_PAD,
|
|
GST_OBJECT_GET_LOCK (element),
|
|
&element->pads_cookie, padlist, (GObject *) element, NULL);
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_iterate_pads:
|
|
* @element: a #GstElement to iterate pads of.
|
|
*
|
|
* Retrieves an iterator of @element's pads. The iterator should
|
|
* be freed after usage. Also more specialized iterators exists such as
|
|
* gst_element_iterate_src_pads() or gst_element_iterate_sink_pads().
|
|
*
|
|
* Returns: (transfer full): 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: (transfer full): 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: (transfer full): 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: (transfer full): a #GstPadTemplate to add to the element class.
|
|
*
|
|
* Adds a padtemplate to an element class. This is mainly used in the _class_init
|
|
* functions of classes. If a pad template with the same name as an already
|
|
* existing one is added the old one is replaced by the new one.
|
|
*
|
|
*/
|
|
void
|
|
gst_element_class_add_pad_template (GstElementClass * klass,
|
|
GstPadTemplate * templ)
|
|
{
|
|
GList *template_list = klass->padtemplates;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT_CLASS (klass));
|
|
g_return_if_fail (GST_IS_PAD_TEMPLATE (templ));
|
|
|
|
/* If we already have a pad template with the same name replace the
|
|
* old one. */
|
|
while (template_list) {
|
|
GstPadTemplate *padtempl = (GstPadTemplate *) template_list->data;
|
|
|
|
/* Found pad with the same name, replace and return */
|
|
if (strcmp (templ->name_template, padtempl->name_template) == 0) {
|
|
gst_object_unref (padtempl);
|
|
template_list->data = templ;
|
|
return;
|
|
}
|
|
template_list = g_list_next (template_list);
|
|
}
|
|
|
|
/* Take ownership of the floating ref */
|
|
gst_object_ref_sink (templ);
|
|
|
|
klass->padtemplates = g_list_append (klass->padtemplates, templ);
|
|
klass->numpadtemplates++;
|
|
}
|
|
|
|
/**
|
|
* gst_element_class_add_metadata:
|
|
* @klass: class to set metadata for
|
|
* @key: the key to set
|
|
* @value: the value to set
|
|
*
|
|
* Set @key with @value as metadata in @klass.
|
|
*/
|
|
void
|
|
gst_element_class_add_metadata (GstElementClass * klass,
|
|
const gchar * key, const gchar * value)
|
|
{
|
|
g_return_if_fail (GST_IS_ELEMENT_CLASS (klass));
|
|
g_return_if_fail (key != NULL);
|
|
g_return_if_fail (value != NULL);
|
|
|
|
gst_structure_set ((GstStructure *) klass->metadata,
|
|
key, G_TYPE_STRING, value, NULL);
|
|
}
|
|
|
|
/**
|
|
* gst_element_class_set_metadata:
|
|
* @klass: class to set metadata for
|
|
* @longname: The long English name of the element. E.g. "File Sink"
|
|
* @classification: String describing the type of element, as an unordered list
|
|
* separated with slashes ('/'). See draft-klass.txt of the design docs
|
|
* for more details and common types. E.g: "Sink/File"
|
|
* @description: Sentence describing the purpose of the element.
|
|
* E.g: "Write stream to a file"
|
|
* @author: Name and contact details of the author(s). Use \n to separate
|
|
* multiple author metadata. E.g: "Joe Bloggs <joe.blogs at foo.com>"
|
|
*
|
|
* Sets the detailed information for a #GstElementClass.
|
|
* <note>This function is for use in _class_init functions only.</note>
|
|
*/
|
|
void
|
|
gst_element_class_set_metadata (GstElementClass * klass,
|
|
const gchar * longname, const gchar * classification,
|
|
const gchar * description, const gchar * author)
|
|
{
|
|
g_return_if_fail (GST_IS_ELEMENT_CLASS (klass));
|
|
|
|
gst_structure_set ((GstStructure *) klass->metadata,
|
|
GST_ELEMENT_METADATA_LONGNAME, G_TYPE_STRING, longname,
|
|
GST_ELEMENT_METADATA_KLASS, G_TYPE_STRING, classification,
|
|
GST_ELEMENT_METADATA_DESCRIPTION, G_TYPE_STRING, description,
|
|
GST_ELEMENT_METADATA_AUTHOR, G_TYPE_STRING, author, NULL);
|
|
}
|
|
|
|
/**
|
|
* gst_element_class_get_metadata:
|
|
* @klass: class to get metadata for
|
|
* @key: the key to get
|
|
*
|
|
* Get metadata with @key in @klass.
|
|
*
|
|
* Returns: the metadata for @key.
|
|
*/
|
|
const gchar *
|
|
gst_element_class_get_metadata (GstElementClass * klass, const gchar * key)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT_CLASS (klass), NULL);
|
|
g_return_val_if_fail (key != NULL, NULL);
|
|
|
|
return gst_structure_get_string ((GstStructure *) klass->metadata, key);
|
|
}
|
|
|
|
/**
|
|
* 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: (transfer none) (element-type Gst.PadTemplate): the #GList of
|
|
* pad templates.
|
|
*/
|
|
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: (transfer none): 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 = element_class->padtemplates;
|
|
|
|
while (padlist) {
|
|
GstPadTemplate *padtempl = (GstPadTemplate *) padlist->data;
|
|
|
|
if (strcmp (padtempl->name_template, name) == 0)
|
|
return padtempl;
|
|
|
|
padlist = g_list_next (padlist);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static GstPadTemplate *
|
|
gst_element_class_get_request_pad_template (GstElementClass *
|
|
element_class, const gchar * name)
|
|
{
|
|
GstPadTemplate *tmpl;
|
|
|
|
tmpl = gst_element_class_get_pad_template (element_class, name);
|
|
if (tmpl != NULL && tmpl->presence == GST_PAD_REQUEST)
|
|
return tmpl;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* get a random pad on element of the given direction.
|
|
* The pad is random in a sense that it is the first pad that is (optionaly) linked.
|
|
*/
|
|
static GstPad *
|
|
gst_element_get_random_pad (GstElement * element,
|
|
gboolean need_linked, 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_CAST (pads->data);
|
|
|
|
GST_OBJECT_LOCK (pad);
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "checking pad %s:%s",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
|
|
if (need_linked && !GST_PAD_IS_LINKED (pad)) {
|
|
/* if we require a linked pad, and it is not linked, continue the
|
|
* search */
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "pad %s:%s is not linked",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
GST_OBJECT_UNLOCK (pad);
|
|
continue;
|
|
} else {
|
|
/* found a pad, stop search */
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "found pad %s:%s",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
GST_OBJECT_UNLOCK (pad);
|
|
result = pad;
|
|
break;
|
|
}
|
|
}
|
|
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;
|
|
}
|
|
}
|
|
|
|
static gboolean
|
|
gst_element_default_send_event (GstElement * element, GstEvent * event)
|
|
{
|
|
gboolean result = FALSE;
|
|
GstPad *pad;
|
|
|
|
pad = GST_EVENT_IS_DOWNSTREAM (event) ?
|
|
gst_element_get_random_pad (element, TRUE, GST_PAD_SRC) :
|
|
gst_element_get_random_pad (element, TRUE, 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));
|
|
gst_event_unref (event);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_send_event:
|
|
* @element: a #GstElement to send the event to.
|
|
* @event: (transfer full): 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 pushed on a random linked sink pad for
|
|
* upstream events or a random linked source pad for downstream events.
|
|
*
|
|
* 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);
|
|
|
|
GST_STATE_LOCK (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);
|
|
}
|
|
GST_STATE_UNLOCK (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. See gst_event_new_seek() for the details of
|
|
* the parameters. The seek event is sent to the element using
|
|
* gst_element_send_event().
|
|
*
|
|
* 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;
|
|
}
|
|
|
|
static gboolean
|
|
gst_element_default_query (GstElement * element, GstQuery * query)
|
|
{
|
|
gboolean result = FALSE;
|
|
GstPad *pad;
|
|
|
|
pad = gst_element_get_random_pad (element, FALSE, GST_PAD_SRC);
|
|
if (pad) {
|
|
result = gst_pad_query (pad, query);
|
|
|
|
gst_object_unref (pad);
|
|
} else {
|
|
pad = gst_element_get_random_pad (element, TRUE, 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_query:
|
|
* @element: a #GstElement to perform the query on.
|
|
* @query: (transfer none): the #GstQuery.
|
|
*
|
|
* Performs a query on the given element.
|
|
*
|
|
* For elements that don't implement a query handler, this function
|
|
* forwards the query to a random srcpad or to the peer of a
|
|
* random linked sinkpad of this element.
|
|
*
|
|
* Please note that some queries might need a running pipeline to work.
|
|
*
|
|
* 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);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_post_message:
|
|
* @element: a #GstElement posting the message
|
|
* @message: (transfer full): 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. The function returns
|
|
* %FALSE if the element did not have a bus.
|
|
*
|
|
* 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);
|
|
|
|
/* we release the element lock when posting the message so that any
|
|
* (synchronous) message handlers can operate on the element */
|
|
result = gst_bus_post (bus, message);
|
|
gst_object_unref (bus);
|
|
|
|
return result;
|
|
|
|
/* ERRORS */
|
|
no_bus:
|
|
{
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_MESSAGE, element,
|
|
"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: (transfer full): 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: (allow-none) (transfer full): an allocated text string to be used
|
|
* as a replacement for the default message connected to code,
|
|
* or %NULL
|
|
* @debug: (allow-none) (transfer full): 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, warning or info message on the bus from inside an element.
|
|
*
|
|
* @type must be of #GST_MESSAGE_ERROR, #GST_MESSAGE_WARNING or
|
|
* #GST_MESSAGE_INFO.
|
|
*
|
|
* 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_CAT_DEBUG_OBJECT (GST_CAT_MESSAGE, element, "start");
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
g_return_if_fail ((type == GST_MESSAGE_ERROR) ||
|
|
(type == GST_MESSAGE_WARNING) || (type == GST_MESSAGE_INFO));
|
|
|
|
/* 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_CAST (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);
|
|
|
|
switch (type) {
|
|
case GST_MESSAGE_ERROR:
|
|
message =
|
|
gst_message_new_error (GST_OBJECT_CAST (element), gerror, sent_debug);
|
|
break;
|
|
case GST_MESSAGE_WARNING:
|
|
message = gst_message_new_warning (GST_OBJECT_CAST (element), gerror,
|
|
sent_debug);
|
|
break;
|
|
case GST_MESSAGE_INFO:
|
|
message = gst_message_new_info (GST_OBJECT_CAST (element), gerror,
|
|
sent_debug);
|
|
break;
|
|
default:
|
|
g_assert_not_reached ();
|
|
break;
|
|
}
|
|
gst_element_post_message (element, message);
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_ERROR_SYSTEM, element, "posted %s message: %s",
|
|
(type == GST_MESSAGE_ERROR ? "error" : "warning"), 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_ELEMENT_IS_LOCKED_STATE (element);
|
|
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 parameters 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_ELEMENT_IS_LOCKED_STATE (element);
|
|
|
|
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_FLAG_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_FLAG_LOCKED_STATE);
|
|
}
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
return TRUE;
|
|
|
|
was_ok:
|
|
{
|
|
GST_CAT_DEBUG (GST_CAT_STATES,
|
|
"elements %s was already 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;
|
|
GstState target;
|
|
GstStateChangeReturn ret;
|
|
|
|
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;
|
|
|
|
GST_OBJECT_LOCK (parent);
|
|
parent_current = GST_STATE (parent);
|
|
parent_pending = GST_STATE_PENDING (parent);
|
|
GST_OBJECT_UNLOCK (parent);
|
|
|
|
/* set to pending if there is one, else we set it to the current state of
|
|
* the parent */
|
|
if (parent_pending != GST_STATE_VOID_PENDING)
|
|
target = parent_pending;
|
|
else
|
|
target = parent_current;
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"syncing state (%s) to parent %s %s (%s, %s)",
|
|
gst_element_state_get_name (GST_STATE (element)),
|
|
GST_ELEMENT_NAME (parent), gst_element_state_get_name (target),
|
|
gst_element_state_get_name (parent_current),
|
|
gst_element_state_get_name (parent_pending));
|
|
|
|
ret = gst_element_set_state (element, target);
|
|
if (ret == GST_STATE_CHANGE_FAILURE)
|
|
goto failed;
|
|
|
|
gst_object_unref (parent);
|
|
|
|
return TRUE;
|
|
} else {
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element, "element has no parent");
|
|
}
|
|
return FALSE;
|
|
|
|
/* ERROR */
|
|
failed:
|
|
{
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"syncing state failed (%s)",
|
|
gst_element_state_change_return_get_name (ret));
|
|
gst_object_unref (parent);
|
|
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, timeout %"
|
|
GST_TIME_FORMAT, GST_TIME_ARGS (timeout));
|
|
|
|
GST_OBJECT_LOCK (element);
|
|
ret = GST_STATE_RETURN (element);
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element, "RETURN is %s",
|
|
gst_element_state_change_return_get_name (ret));
|
|
|
|
/* we got an error, report immediately */
|
|
if (ret == GST_STATE_CHANGE_FAILURE)
|
|
goto done;
|
|
|
|
/* we got no_preroll, report immediately */
|
|
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 detect state changes 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: %s",
|
|
gst_element_state_get_name (GST_STATE (element)),
|
|
gst_element_state_get_name (GST_STATE_PENDING (element)),
|
|
gst_element_state_change_return_get_name (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, "interruped");
|
|
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
return GST_STATE_CHANGE_FAILURE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_state:
|
|
* @element: a #GstElement to get the state of.
|
|
* @state: (out) (allow-none): a pointer to #GstState to hold the state.
|
|
* Can be %NULL.
|
|
* @pending: (out) (allow-none): 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
|
|
* %GST_STATE_PLAYING. 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;
|
|
}
|
|
}
|
|
|
|
/* Not static because GstBin has manual state handling too */
|
|
void
|
|
_priv_gst_element_state_changed (GstElement * element, GstState oldstate,
|
|
GstState newstate, GstState pending)
|
|
{
|
|
GstElementClass *klass = GST_ELEMENT_GET_CLASS (element);
|
|
GstMessage *message;
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
|
|
"notifying about state-changed %s to %s (%s pending)",
|
|
gst_element_state_get_name (oldstate),
|
|
gst_element_state_get_name (newstate),
|
|
gst_element_state_get_name (pending));
|
|
|
|
if (klass->state_changed)
|
|
klass->state_changed (element, oldstate, newstate, pending);
|
|
|
|
message = gst_message_new_state_changed (GST_OBJECT_CAST (element),
|
|
oldstate, newstate, pending);
|
|
gst_element_post_message (element, message);
|
|
}
|
|
|
|
/**
|
|
* 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 %GST_STATE_CHANGE_SUCCESS from the state change function.
|
|
*
|
|
* If after calling this method the element still has not reached
|
|
* the pending state, the next state change is performed.
|
|
*
|
|
* This method is used internally and should normally not be called by plugins
|
|
* or applications.
|
|
*
|
|
* Returns: The result of the commit state change.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstStateChangeReturn
|
|
gst_element_continue_state (GstElement * element, GstStateChangeReturn ret)
|
|
{
|
|
GstStateChangeReturn old_ret;
|
|
GstState old_state, old_next;
|
|
GstState current, next, pending;
|
|
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 = (GstStateChange) 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, next %s",
|
|
gst_element_state_get_name (old_state),
|
|
gst_element_state_get_name (old_next),
|
|
gst_element_state_get_name (pending), gst_element_state_get_name (next));
|
|
|
|
_priv_gst_element_state_changed (element, old_state, old_next, pending);
|
|
|
|
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 to %s", gst_element_state_get_name (pending));
|
|
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)
|
|
_priv_gst_element_state_changed (element, old_state, old_next,
|
|
GST_STATE_VOID_PENDING);
|
|
|
|
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 %GST_STATE_CHANGE_ASYNC.
|
|
*
|
|
* An ASYNC_START message is posted. If the element was PLAYING, it will
|
|
* go to PAUSED. The element will be restored to its PLAYING state by
|
|
* the parent pipeline when it prerolls again.
|
|
*
|
|
* This is mostly used for elements that lost their preroll buffer
|
|
* in the %GST_STATE_PAUSED or %GST_STATE_PLAYING state after a flush,
|
|
* they will go to their pending state again when 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 is used internally and should normally not be called from
|
|
* plugins or applications.
|
|
*/
|
|
void
|
|
gst_element_lost_state (GstElement * element)
|
|
{
|
|
GstState old_state, new_state;
|
|
GstMessage *message;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
GST_OBJECT_LOCK (element);
|
|
if (GST_STATE_RETURN (element) == GST_STATE_CHANGE_FAILURE)
|
|
goto nothing_lost;
|
|
|
|
if (GST_STATE_PENDING (element) != GST_STATE_VOID_PENDING)
|
|
goto only_async_start;
|
|
|
|
old_state = GST_STATE (element);
|
|
|
|
/* when we were PLAYING, the new state is PAUSED. We will also not
|
|
* automatically go to PLAYING but let the parent bin(s) set us to PLAYING
|
|
* when we preroll. */
|
|
if (old_state > GST_STATE_PAUSED)
|
|
new_state = GST_STATE_PAUSED;
|
|
else
|
|
new_state = old_state;
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"lost state of %s to %s", gst_element_state_get_name (old_state),
|
|
gst_element_state_get_name (new_state));
|
|
|
|
GST_STATE (element) = new_state;
|
|
GST_STATE_NEXT (element) = new_state;
|
|
GST_STATE_PENDING (element) = new_state;
|
|
GST_STATE_RETURN (element) = GST_STATE_CHANGE_ASYNC;
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
_priv_gst_element_state_changed (element, new_state, new_state, new_state);
|
|
|
|
message = gst_message_new_async_start (GST_OBJECT_CAST (element));
|
|
gst_element_post_message (element, message);
|
|
|
|
return;
|
|
|
|
nothing_lost:
|
|
{
|
|
GST_OBJECT_UNLOCK (element);
|
|
return;
|
|
}
|
|
only_async_start:
|
|
{
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
message = gst_message_new_async_start (GST_OBJECT_CAST (element));
|
|
gst_element_post_message (element, message);
|
|
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.
|
|
*
|
|
* State changes to %GST_STATE_READY or %GST_STATE_NULL never return
|
|
* #GST_STATE_CHANGE_ASYNC.
|
|
*
|
|
* 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);
|
|
|
|
/* this is the (new) state we should go to. TARGET is the last state we set on
|
|
* the element. */
|
|
if (state != GST_STATE_TARGET (element)) {
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"setting target state to %s", gst_element_state_get_name (state));
|
|
GST_STATE_TARGET (element) = state;
|
|
/* increment state cookie so that we can track each state change. We only do
|
|
* this if this is actually a new state change. */
|
|
element->state_cookie++;
|
|
}
|
|
GST_STATE_PENDING (element) = state;
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"current %s, old_pending %s, next %s, old return %s",
|
|
gst_element_state_get_name (current),
|
|
gst_element_state_get_name (old_pending),
|
|
gst_element_state_get_name (next),
|
|
gst_element_state_change_return_get_name (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 = (GstStateChange) 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 incremented */
|
|
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 %s",
|
|
gst_element_state_change_return_get_name (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;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_change_state:
|
|
* @element: a #GstElement
|
|
* @transition: the requested transition
|
|
*
|
|
* Perform @transition on @element.
|
|
*
|
|
* This function must be called with STATE_LOCK held and is mainly used
|
|
* internally.
|
|
*
|
|
* Returns: the #GstStateChangeReturn of the state transition.
|
|
*/
|
|
GstStateChangeReturn
|
|
gst_element_change_state (GstElement * element, GstStateChange transition)
|
|
{
|
|
GstElementClass *oclass;
|
|
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
/* 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:
|
|
{
|
|
GstState target;
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"element will change state ASYNC");
|
|
|
|
target = GST_STATE_TARGET (element);
|
|
|
|
if (target > GST_STATE_READY)
|
|
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 (target),
|
|
gst_element_state_get_name (GST_STATE_READY));
|
|
|
|
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);
|
|
|
|
/* we are in error now */
|
|
ret = GST_STATE_CHANGE_FAILURE;
|
|
GST_STATE_RETURN (element) = ret;
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/* gst_iterator_fold functions for pads_activate
|
|
* Stop the iterator if activating one pad failed. */
|
|
static gboolean
|
|
activate_pads (const GValue * vpad, GValue * ret, gboolean * active)
|
|
{
|
|
GstPad *pad = g_value_get_object (vpad);
|
|
gboolean cont = TRUE;
|
|
|
|
if (!(cont = gst_pad_set_active (pad, *active)))
|
|
g_value_set_boolean (ret, FALSE);
|
|
|
|
return cont;
|
|
}
|
|
|
|
/* returns false on error or early cutout of the fold, true if all
|
|
* pads in @iter were (de)activated successfully. */
|
|
static gboolean
|
|
iterator_activate_fold_with_resync (GstIterator * iter,
|
|
GstIteratorFoldFunction func, gpointer user_data)
|
|
{
|
|
GstIteratorResult ires;
|
|
GValue ret = { 0 };
|
|
|
|
/* no need to unset this later, it's just a boolean */
|
|
g_value_init (&ret, G_TYPE_BOOLEAN);
|
|
g_value_set_boolean (&ret, TRUE);
|
|
|
|
while (1) {
|
|
ires = gst_iterator_fold (iter, func, &ret, user_data);
|
|
switch (ires) {
|
|
case GST_ITERATOR_RESYNC:
|
|
/* need to reset the result again */
|
|
g_value_set_boolean (&ret, TRUE);
|
|
gst_iterator_resync (iter);
|
|
break;
|
|
case GST_ITERATOR_DONE:
|
|
/* all pads iterated, return collected value */
|
|
goto done;
|
|
default:
|
|
/* iterator returned _ERROR or premature end with _OK,
|
|
* mark an error and exit */
|
|
g_value_set_boolean (&ret, FALSE);
|
|
goto done;
|
|
}
|
|
}
|
|
done:
|
|
/* return collected value */
|
|
return g_value_get_boolean (&ret);
|
|
}
|
|
|
|
/* is called with STATE_LOCK
|
|
*
|
|
* Pads are activated from source pads to sinkpads.
|
|
*/
|
|
static gboolean
|
|
gst_element_pads_activate (GstElement * element, gboolean active)
|
|
{
|
|
GstIterator *iter;
|
|
gboolean res;
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_ELEMENT_PADS, element,
|
|
"pads_activate with active %d", active);
|
|
|
|
iter = gst_element_iterate_src_pads (element);
|
|
res =
|
|
iterator_activate_fold_with_resync (iter,
|
|
(GstIteratorFoldFunction) activate_pads, &active);
|
|
gst_iterator_free (iter);
|
|
if (G_UNLIKELY (!res))
|
|
goto src_failed;
|
|
|
|
iter = gst_element_iterate_sink_pads (element);
|
|
res =
|
|
iterator_activate_fold_with_resync (iter,
|
|
(GstIteratorFoldFunction) activate_pads, &active);
|
|
gst_iterator_free (iter);
|
|
if (G_UNLIKELY (!res))
|
|
goto sink_failed;
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_ELEMENT_PADS, element,
|
|
"pads_activate successful");
|
|
|
|
return TRUE;
|
|
|
|
/* ERRORS */
|
|
src_failed:
|
|
{
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_ELEMENT_PADS, element,
|
|
"source pads_activate failed");
|
|
return FALSE;
|
|
}
|
|
sink_failed:
|
|
{
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_ELEMENT_PADS, element,
|
|
"sink pads_activate failed");
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/* 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 = (GstState) 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;
|
|
}
|
|
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: (transfer none): 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_CAST (object);
|
|
GstClock **clock_p;
|
|
GstBus **bus_p;
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_REFCOUNTING, element, "dispose");
|
|
|
|
if (GST_STATE (element) != GST_STATE_NULL)
|
|
goto not_null;
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_ELEMENT_PADS, element,
|
|
"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 != NULL)) {
|
|
g_critical ("could not remove pads from element %s",
|
|
GST_STR_NULL (GST_OBJECT_NAME (object)));
|
|
}
|
|
|
|
GST_OBJECT_LOCK (element);
|
|
clock_p = &element->clock;
|
|
bus_p = &element->bus;
|
|
gst_object_replace ((GstObject **) clock_p, NULL);
|
|
gst_object_replace ((GstObject **) bus_p, NULL);
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_REFCOUNTING, element, "parent class dispose");
|
|
|
|
G_OBJECT_CLASS (parent_class)->dispose (object);
|
|
|
|
return;
|
|
|
|
/* ERRORS */
|
|
not_null:
|
|
{
|
|
gboolean is_locked;
|
|
|
|
is_locked = GST_ELEMENT_IS_LOCKED_STATE (element);
|
|
g_critical
|
|
("\nTrying to dispose element %s, but it is in %s%s instead of 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"
|
|
"This problem may also be caused by a refcounting bug in the\n"
|
|
"application or some element.\n",
|
|
GST_OBJECT_NAME (element),
|
|
gst_element_state_get_name (GST_STATE (element)),
|
|
is_locked ? " (locked)" : "");
|
|
return;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_element_finalize (GObject * object)
|
|
{
|
|
GstElement *element = GST_ELEMENT_CAST (object);
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_REFCOUNTING, element, "finalize");
|
|
|
|
g_cond_free (element->state_cond);
|
|
g_static_rec_mutex_free (&element->state_lock);
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_REFCOUNTING, element, "finalize parent");
|
|
|
|
G_OBJECT_CLASS (parent_class)->finalize (object);
|
|
}
|
|
|
|
static void
|
|
gst_element_set_bus_func (GstElement * element, GstBus * bus)
|
|
{
|
|
GstBus **bus_p;
|
|
|
|
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);
|
|
bus_p = &GST_ELEMENT_BUS (element);
|
|
gst_object_replace ((GstObject **) bus_p, GST_OBJECT_CAST (bus));
|
|
GST_OBJECT_UNLOCK (element);
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_bus:
|
|
* @element: a #GstElement to set the bus of.
|
|
* @bus: (transfer none): the #GstBus to set.
|
|
*
|
|
* Sets the bus of the element. Increases the refcount on the bus.
|
|
* 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. Note that only a #GstPipeline will provide a
|
|
* bus for the application.
|
|
*
|
|
* Returns: (transfer full): 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);
|
|
if ((result = GST_ELEMENT_BUS (element)))
|
|
gst_object_ref (result);
|
|
GST_OBJECT_UNLOCK (element);
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_BUS, element, "got bus %" GST_PTR_FORMAT,
|
|
result);
|
|
|
|
return result;
|
|
}
|