mirror of
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b338085a29
Original commit message from CVS: * docs/design/part-MT-refcounting.txt: * docs/design/part-conventions.txt: * docs/design/part-gstobject.txt: * docs/design/part-relations.txt: * docs/design/part-standards.txt: * gst/gstbin.c: (gst_bin_add_func), (gst_bin_add), (gst_bin_remove_func), (gst_bin_remove), (gst_bin_iterate_recurse), (gst_bin_get_by_name), (gst_bin_get_by_interface), (gst_bin_iterate_all_by_interface): * gst/gstbuffer.h: * gst/gstclock.h: * gst/gstelement.c: (gst_element_class_init), (gst_element_change_state), (gst_element_set_loop_function): * gst/gstelement.h: * gst/gstiterator.c: * gst/gstobject.c: (gst_object_class_init), (gst_object_ref), (gst_object_unref), (gst_object_sink), (gst_object_dispose), (gst_object_dispatch_properties_changed), (gst_object_set_name), (gst_object_set_parent), (gst_object_unparent), (gst_object_check_uniqueness): * gst/gstobject.h: Docs updates, clean up some headers. Free iterators in GstBin. GstObject is now looking good.
3124 lines
86 KiB
C
3124 lines
86 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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#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 "gstbin.h"
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#include "gstmarshal.h"
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#include "gsterror.h"
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#include "gstscheduler.h"
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#include "gstevent.h"
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#include "gstutils.h"
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#include "gstinfo.h"
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#include "gst-i18n-lib.h"
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/* Element signals and args */
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enum
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{
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STATE_CHANGE,
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NEW_PAD,
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PAD_REMOVED,
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ERROR,
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EOS,
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FOUND_TAG,
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NO_MORE_PADS,
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/* add more above */
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LAST_SIGNAL
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};
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enum
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{
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ARG_0
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/* FILL ME */
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};
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extern void __gst_element_details_clear (GstElementDetails * dp);
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extern void __gst_element_details_copy (GstElementDetails * dest,
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const GstElementDetails * src);
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static void gst_element_class_init (GstElementClass * klass);
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static void gst_element_init (GstElement * element);
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static void gst_element_base_class_init (gpointer g_class);
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static void gst_element_base_class_finalize (gpointer g_class);
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static void gst_element_real_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_element_real_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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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 GstElementStateReturn gst_element_change_state (GstElement * element);
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static void gst_element_error_func (GstElement * element, GstElement * source,
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GError * error, gchar * debug);
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static void gst_element_found_tag_func (GstElement * element,
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GstElement * source, const GstTagList * tag_list);
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static GstElementStateReturn gst_element_set_state_func (GstElement * element,
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GstElementState state);
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#ifndef GST_DISABLE_LOADSAVE
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static xmlNodePtr gst_element_save_thyself (GstObject * object,
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xmlNodePtr parent);
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static void gst_element_restore_thyself (GstObject * parent, xmlNodePtr self);
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#endif
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GType _gst_element_type = 0;
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static GstObjectClass *parent_class = NULL;
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static guint gst_element_signals[LAST_SIGNAL] = { 0 };
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GType
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gst_element_get_type (void)
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{
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if (!_gst_element_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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_gst_element_type = g_type_register_static (GST_TYPE_OBJECT, "GstElement",
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&element_info, G_TYPE_FLAG_ABSTRACT);
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}
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return _gst_element_type;
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}
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static void
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gst_element_class_init (GstElementClass * klass)
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{
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GObjectClass *gobject_class;
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GstObjectClass *gstobject_class;
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gobject_class = (GObjectClass *) klass;
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gstobject_class = (GstObjectClass *) klass;
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parent_class = g_type_class_ref (GST_TYPE_OBJECT);
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/**
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* GstElement::state-change:
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* @gstelement: the object which received the signal
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* @int:
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* @int:
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*
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* the #GstElementState of the element has been changed
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*/
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gst_element_signals[STATE_CHANGE] =
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g_signal_new ("state-change", G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstElementClass, state_change), NULL,
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NULL, gst_marshal_VOID__INT_INT, G_TYPE_NONE, 2, G_TYPE_INT, G_TYPE_INT);
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/**
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* GstElement::new-pad:
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* @gstelement: the object which received the signal
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* @object:
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*
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* a new #GstPad has been added to the element
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*/
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gst_element_signals[NEW_PAD] =
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g_signal_new ("new-pad", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstElementClass, new_pad), NULL, NULL,
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gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, G_TYPE_OBJECT);
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/**
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* GstElement::pad-removed:
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* @gstelement: the object which received the signal
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* @object:
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*
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* a #GstPad has been removed from the element
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*/
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gst_element_signals[PAD_REMOVED] =
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g_signal_new ("pad-removed", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstElementClass, pad_removed), NULL, NULL,
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gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, G_TYPE_OBJECT);
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/**
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* GstElement::error:
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* @gstelement: the object which received the signal
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* @element:
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* @error:
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* @message:
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*
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* a #GstError has occured during data processing
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*/
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gst_element_signals[ERROR] =
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g_signal_new ("error", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstElementClass, error), NULL, NULL,
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gst_marshal_VOID__OBJECT_BOXED_STRING, G_TYPE_NONE, 3, GST_TYPE_ELEMENT,
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GST_TYPE_G_ERROR, G_TYPE_STRING);
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/**
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* GstElement::eos:
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* @gstelement: the object which received the signal
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*
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* the end of the stream has been reached
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*/
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gst_element_signals[EOS] =
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g_signal_new ("eos", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstElementClass, eos), NULL, NULL,
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gst_marshal_VOID__VOID, G_TYPE_NONE, 0);
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/**
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* GstElement::found-tag:
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* @gstelement: the object which received the signal
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* @element:
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* @tags:
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*
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* tags for the incomming stream have been received
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*/
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gst_element_signals[FOUND_TAG] =
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g_signal_new ("found-tag", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstElementClass, found_tag), NULL, NULL,
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gst_marshal_VOID__OBJECT_BOXED, G_TYPE_NONE, 2, GST_TYPE_ELEMENT,
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GST_TYPE_TAG_LIST);
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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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* ?
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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->set_property =
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GST_DEBUG_FUNCPTR (gst_element_real_set_property);
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gobject_class->get_property =
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GST_DEBUG_FUNCPTR (gst_element_real_get_property);
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gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_element_dispose);
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gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_element_finalize);
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#ifndef GST_DISABLE_LOADSAVE
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gstobject_class->save_thyself = GST_DEBUG_FUNCPTR (gst_element_save_thyself);
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gstobject_class->restore_thyself =
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GST_DEBUG_FUNCPTR (gst_element_restore_thyself);
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#endif
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klass->change_state = GST_DEBUG_FUNCPTR (gst_element_change_state);
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klass->error = GST_DEBUG_FUNCPTR (gst_element_error_func);
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klass->found_tag = GST_DEBUG_FUNCPTR (gst_element_found_tag_func);
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klass->numpadtemplates = 0;
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klass->set_state = GST_DEBUG_FUNCPTR (gst_element_set_state_func);
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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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GObjectClass *gobject_class = G_OBJECT_CLASS (g_class);
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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gobject_class->set_property =
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GST_DEBUG_FUNCPTR (gst_element_real_set_property);
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gobject_class->get_property =
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GST_DEBUG_FUNCPTR (gst_element_real_get_property);
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memset (&element_class->details, 0, sizeof (GstElementDetails));
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element_class->padtemplates = NULL;
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}
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static void
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gst_element_base_class_finalize (gpointer g_class)
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{
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GstElementClass *klass = GST_ELEMENT_CLASS (g_class);
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g_list_foreach (klass->padtemplates, (GFunc) gst_object_unref, NULL);
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g_list_free (klass->padtemplates);
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__gst_element_details_clear (&klass->details);
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}
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static void
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gst_element_init (GstElement * element)
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{
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element->current_state = GST_STATE_NULL;
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element->pending_state = GST_STATE_VOID_PENDING;
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element->numpads = 0;
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element->numsrcpads = 0;
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element->numsinkpads = 0;
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element->pads_cookie = 0;
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element->pads = NULL;
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element->srcpads = NULL;
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element->sinkpads = NULL;
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element->loopfunc = NULL;
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element->sched = NULL;
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element->clock = NULL;
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element->sched_private = NULL;
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element->state_mutex = g_mutex_new ();
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element->state_cond = g_cond_new ();
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}
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static void
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gst_element_real_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstElementClass *oclass = GST_ELEMENT_GET_CLASS (object);
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if (oclass->set_property)
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(oclass->set_property) (object, prop_id, value, pspec);
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}
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static void
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gst_element_real_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstElementClass *oclass = GST_ELEMENT_GET_CLASS (object);
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if (oclass->get_property)
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(oclass->get_property) (object, prop_id, value, pspec);
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}
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/**
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* gst_element_default_error:
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* @object: a #GObject that signalled the error.
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* @orig: the #GstObject that initiated the error.
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* @error: the GError.
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* @debug: an additional debug information string, or NULL.
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*
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* A default error signal callback to attach to an element.
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* The user data passed to the g_signal_connect is ignored.
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*
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* The default handler will simply print the error string using g_print.
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*
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* MT safe.
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*/
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void
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gst_element_default_error (GObject * object, GstObject * source, GError * error,
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gchar * debug)
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{
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gchar *name = gst_object_get_path_string (source);
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g_print (_("ERROR: from element %s: %s\n"), name, error->message);
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if (debug)
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g_print (_("Additional debug info:\n%s\n"), debug);
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g_free (name);
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}
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typedef struct
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{
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const GParamSpec *pspec;
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GValue value;
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}
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prop_value_t;
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static void
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element_set_property (GstElement * element, const GParamSpec * pspec,
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const GValue * value)
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{
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prop_value_t *prop_value = g_new0 (prop_value_t, 1);
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prop_value->pspec = pspec;
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prop_value->value = *value;
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g_async_queue_push (element->prop_value_queue, prop_value);
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}
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static void
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element_get_property (GstElement * element, const GParamSpec * pspec,
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GValue * value)
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{
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g_mutex_lock (element->property_mutex);
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g_object_get_property ((GObject *) element, pspec->name, value);
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g_mutex_unlock (element->property_mutex);
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}
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static void
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gst_element_threadsafe_properties_pre_run (GstElement * element)
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{
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/* need to ref the object because we don't want to lose the object
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* before the post run function is called */
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gst_object_ref (GST_OBJECT (element));
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GST_DEBUG ("locking element %s", GST_OBJECT_NAME (element));
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g_mutex_lock (element->property_mutex);
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gst_element_set_pending_properties (element);
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}
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static void
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gst_element_threadsafe_properties_post_run (GstElement * element)
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{
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GST_DEBUG ("unlocking element %s", GST_OBJECT_NAME (element));
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g_mutex_unlock (element->property_mutex);
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gst_object_unref (GST_OBJECT (element));
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}
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/**
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* gst_element_enable_threadsafe_properties:
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* @element: a #GstElement to enable threadsafe properties on.
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*
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* Installs an asynchronous queue, a mutex and pre- and post-run functions on
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* this element so that properties on the element can be set in a
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* threadsafe way.
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*/
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void
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gst_element_enable_threadsafe_properties (GstElement * element)
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{
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g_return_if_fail (GST_IS_ELEMENT (element));
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GST_FLAG_SET (element, GST_ELEMENT_USE_THREADSAFE_PROPERTIES);
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element->pre_run_func = gst_element_threadsafe_properties_pre_run;
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element->post_run_func = gst_element_threadsafe_properties_post_run;
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if (!element->prop_value_queue)
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element->prop_value_queue = g_async_queue_new ();
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if (!element->property_mutex)
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element->property_mutex = g_mutex_new ();
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}
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/**
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* gst_element_disable_threadsafe_properties:
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* @element: a #GstElement to disable threadsafe properties on.
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*
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* Removes the threadsafe properties, post- and pre-run locks from
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* this element.
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*/
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void
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gst_element_disable_threadsafe_properties (GstElement * element)
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{
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g_return_if_fail (GST_IS_ELEMENT (element));
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GST_FLAG_UNSET (element, GST_ELEMENT_USE_THREADSAFE_PROPERTIES);
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//element->pre_run_func = NULL;
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//element->post_run_func = NULL;
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/* let's keep around that async queue */
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}
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/**
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* gst_element_set_pending_properties:
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* @element: a #GstElement to set the pending properties on.
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*
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* Sets all pending properties on the threadsafe properties enabled
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* element.
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*/
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void
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gst_element_set_pending_properties (GstElement * element)
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{
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prop_value_t *prop_value;
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while ((prop_value = g_async_queue_try_pop (element->prop_value_queue))) {
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g_object_set_property ((GObject *) element, prop_value->pspec->name,
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&prop_value->value);
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g_value_unset (&prop_value->value);
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g_free (prop_value);
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}
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}
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/* following 6 functions taken mostly from gobject.c */
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/**
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* gst_element_set:
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* @element: a #GstElement to set properties on.
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* @first_property_name: the first property to set.
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* @...: value of the first property, and more properties to set, ending
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* with NULL.
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*
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* Sets properties on an element. If the element uses threadsafe properties,
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* they will be queued and set on the object when it is scheduled again.
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*/
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void
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gst_element_set (GstElement * element, const gchar * first_property_name, ...)
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{
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va_list var_args;
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g_return_if_fail (GST_IS_ELEMENT (element));
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va_start (var_args, first_property_name);
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gst_element_set_valist (element, first_property_name, var_args);
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va_end (var_args);
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|
}
|
|
|
|
/**
|
|
* gst_element_get:
|
|
* @element: a #GstElement to get properties of.
|
|
* @first_property_name: the first property to get.
|
|
* @...: pointer to a variable to store the first property in, as well as
|
|
* more properties to get, ending with NULL.
|
|
*
|
|
* Gets properties from an element. If the element uses threadsafe properties,
|
|
* the element will be locked before getting the given properties.
|
|
*/
|
|
void
|
|
gst_element_get (GstElement * element, const gchar * first_property_name, ...)
|
|
{
|
|
va_list var_args;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
va_start (var_args, first_property_name);
|
|
gst_element_get_valist (element, first_property_name, var_args);
|
|
va_end (var_args);
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_valist:
|
|
* @element: a #GstElement to set properties on.
|
|
* @first_property_name: the first property to set.
|
|
* @var_args: the var_args list of other properties to get.
|
|
*
|
|
* Sets properties on an element. If the element uses threadsafe properties,
|
|
* the property change will be put on the async queue.
|
|
*/
|
|
void
|
|
gst_element_set_valist (GstElement * element, const gchar * first_property_name,
|
|
va_list var_args)
|
|
{
|
|
const gchar *name;
|
|
GObject *object;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
object = (GObject *) element;
|
|
|
|
GST_CAT_DEBUG (GST_CAT_PROPERTIES,
|
|
"setting valist of properties starting with %s on element %s",
|
|
first_property_name, gst_element_get_name (element));
|
|
|
|
if (!GST_FLAG_IS_SET (element, GST_ELEMENT_USE_THREADSAFE_PROPERTIES)) {
|
|
g_object_set_valist (object, first_property_name, var_args);
|
|
return;
|
|
}
|
|
|
|
g_object_ref (object);
|
|
|
|
name = first_property_name;
|
|
|
|
while (name) {
|
|
GValue value = { 0, };
|
|
GParamSpec *pspec;
|
|
gchar *error = NULL;
|
|
|
|
pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (object), name);
|
|
|
|
if (!pspec) {
|
|
g_warning ("%s: object class `%s' has no property named `%s'",
|
|
G_STRLOC, G_OBJECT_TYPE_NAME (object), name);
|
|
break;
|
|
}
|
|
if (!(pspec->flags & G_PARAM_WRITABLE)) {
|
|
g_warning ("%s: property `%s' of object class `%s' is not writable",
|
|
G_STRLOC, pspec->name, G_OBJECT_TYPE_NAME (object));
|
|
break;
|
|
}
|
|
|
|
g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (pspec));
|
|
|
|
G_VALUE_COLLECT (&value, var_args, 0, &error);
|
|
if (error) {
|
|
g_warning ("%s: %s", G_STRLOC, error);
|
|
g_free (error);
|
|
|
|
/* we purposely leak the value here, it might not be
|
|
* in a sane state if an error condition occoured
|
|
*/
|
|
break;
|
|
}
|
|
|
|
element_set_property (element, pspec, &value);
|
|
g_value_unset (&value);
|
|
|
|
name = va_arg (var_args, gchar *);
|
|
}
|
|
|
|
g_object_unref (object);
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_valist:
|
|
* @element: a #GstElement to get properties of.
|
|
* @first_property_name: the first property to get.
|
|
* @var_args: the var_args list of other properties to get.
|
|
*
|
|
* Gets properties from an element. If the element uses threadsafe properties,
|
|
* the element will be locked before getting the given properties.
|
|
*/
|
|
void
|
|
gst_element_get_valist (GstElement * element, const gchar * first_property_name,
|
|
va_list var_args)
|
|
{
|
|
const gchar *name;
|
|
GObject *object;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
object = (GObject *) element;
|
|
|
|
if (!GST_FLAG_IS_SET (element, GST_ELEMENT_USE_THREADSAFE_PROPERTIES)) {
|
|
g_object_get_valist (object, first_property_name, var_args);
|
|
return;
|
|
}
|
|
|
|
g_object_ref (object);
|
|
|
|
name = first_property_name;
|
|
|
|
while (name) {
|
|
GValue value = { 0, };
|
|
GParamSpec *pspec;
|
|
gchar *error;
|
|
|
|
pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (object), name);
|
|
|
|
if (!pspec) {
|
|
g_warning ("%s: object class `%s' has no property named `%s'",
|
|
G_STRLOC, G_OBJECT_TYPE_NAME (object), name);
|
|
break;
|
|
}
|
|
if (!(pspec->flags & G_PARAM_READABLE)) {
|
|
g_warning ("%s: property `%s' of object class `%s' is not readable",
|
|
G_STRLOC, pspec->name, G_OBJECT_TYPE_NAME (object));
|
|
break;
|
|
}
|
|
|
|
g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (pspec));
|
|
|
|
element_get_property (element, pspec, &value);
|
|
|
|
G_VALUE_LCOPY (&value, var_args, 0, &error);
|
|
if (error) {
|
|
g_warning ("%s: %s", G_STRLOC, error);
|
|
g_free (error);
|
|
g_value_unset (&value);
|
|
break;
|
|
}
|
|
|
|
g_value_unset (&value);
|
|
|
|
name = va_arg (var_args, gchar *);
|
|
}
|
|
|
|
g_object_unref (object);
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_property:
|
|
* @element: a #GstElement to set properties on.
|
|
* @property_name: the first property to get.
|
|
* @value: the #GValue that holds the value to set.
|
|
*
|
|
* Sets a property on an element. If the element uses threadsafe properties,
|
|
* the property will be put on the async queue.
|
|
*/
|
|
void
|
|
gst_element_set_property (GstElement * element, const gchar * property_name,
|
|
const GValue * value)
|
|
{
|
|
GParamSpec *pspec;
|
|
GObject *object;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
g_return_if_fail (property_name != NULL);
|
|
g_return_if_fail (G_IS_VALUE (value));
|
|
|
|
object = (GObject *) element;
|
|
|
|
GST_CAT_DEBUG (GST_CAT_PROPERTIES, "setting property %s on element %s",
|
|
property_name, gst_element_get_name (element));
|
|
if (!GST_FLAG_IS_SET (element, GST_ELEMENT_USE_THREADSAFE_PROPERTIES)) {
|
|
g_object_set_property (object, property_name, value);
|
|
return;
|
|
}
|
|
|
|
g_object_ref (object);
|
|
|
|
pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (object),
|
|
property_name);
|
|
|
|
if (!pspec)
|
|
g_warning ("%s: object class `%s' has no property named `%s'",
|
|
G_STRLOC, G_OBJECT_TYPE_NAME (object), property_name);
|
|
else
|
|
element_set_property (element, pspec, value);
|
|
|
|
g_object_unref (object);
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_property:
|
|
* @element: a #GstElement to get properties of.
|
|
* @property_name: the first property to get.
|
|
* @value: the #GValue to store the property value in.
|
|
*
|
|
* Gets a property from an element. If the element uses threadsafe properties,
|
|
* the element will be locked before getting the given property.
|
|
*/
|
|
void
|
|
gst_element_get_property (GstElement * element, const gchar * property_name,
|
|
GValue * value)
|
|
{
|
|
GParamSpec *pspec;
|
|
GObject *object;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
g_return_if_fail (property_name != NULL);
|
|
g_return_if_fail (G_IS_VALUE (value));
|
|
|
|
object = (GObject *) element;
|
|
|
|
if (!GST_FLAG_IS_SET (element, GST_ELEMENT_USE_THREADSAFE_PROPERTIES)) {
|
|
g_object_get_property (object, property_name, value);
|
|
return;
|
|
}
|
|
|
|
g_object_ref (object);
|
|
|
|
pspec =
|
|
g_object_class_find_property (G_OBJECT_GET_CLASS (object), property_name);
|
|
|
|
if (!pspec)
|
|
g_warning ("%s: object class `%s' has no property named `%s'",
|
|
G_STRLOC, G_OBJECT_TYPE_NAME (object), property_name);
|
|
else {
|
|
GValue *prop_value, tmp_value = { 0, };
|
|
|
|
/* auto-conversion of the callers value type
|
|
*/
|
|
if (G_VALUE_TYPE (value) == G_PARAM_SPEC_VALUE_TYPE (pspec)) {
|
|
g_value_reset (value);
|
|
prop_value = value;
|
|
} else if (!g_value_type_transformable (G_PARAM_SPEC_VALUE_TYPE (pspec),
|
|
G_VALUE_TYPE (value))) {
|
|
g_warning
|
|
("can't retrieve property `%s' of type `%s' as value of type `%s'",
|
|
pspec->name, g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)),
|
|
G_VALUE_TYPE_NAME (value));
|
|
g_object_unref (object);
|
|
return;
|
|
} else {
|
|
g_value_init (&tmp_value, G_PARAM_SPEC_VALUE_TYPE (pspec));
|
|
prop_value = &tmp_value;
|
|
}
|
|
element_get_property (element, pspec, prop_value);
|
|
if (prop_value != value) {
|
|
g_value_transform (prop_value, value);
|
|
g_value_unset (&tmp_value);
|
|
}
|
|
}
|
|
|
|
g_object_unref (object);
|
|
}
|
|
|
|
/**
|
|
* gst_element_release_request_pad:
|
|
* @element: a #GstElement to release the request pad of.
|
|
* @pad: the #GstPad to release.
|
|
*
|
|
* Makes the element free the previously requested pad as obtained
|
|
* with gst_element_get_request_pad().
|
|
*
|
|
* MT safe.
|
|
*/
|
|
void
|
|
gst_element_release_request_pad (GstElement * element, GstPad * pad)
|
|
{
|
|
GstElementClass *oclass;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->release_pad)
|
|
(oclass->release_pad) (element, pad);
|
|
else
|
|
gst_element_remove_pad (element, pad);
|
|
}
|
|
|
|
/**
|
|
* gst_element_requires_clock:
|
|
* @element: a #GstElement to query
|
|
*
|
|
* Query if the element requires a clock.
|
|
*
|
|
* Returns: TRUE if the element requires a clock
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_requires_clock (GstElement * element)
|
|
{
|
|
gboolean result = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), result);
|
|
|
|
result = (GST_ELEMENT_GET_CLASS (element)->set_clock != NULL);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_provides_clock:
|
|
* @element: a #GstElement to query
|
|
*
|
|
* Query if the element provides a clock.
|
|
*
|
|
* Returns: TRUE if the element provides a clock
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_provides_clock (GstElement * element)
|
|
{
|
|
gboolean result = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
|
|
result = (GST_ELEMENT_GET_CLASS (element)->get_clock != NULL);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_clock:
|
|
* @element: a #GstElement to set the clock for.
|
|
* @clock: the #GstClock to set for the element.
|
|
*
|
|
* Sets the clock for the element. This function increases the
|
|
* refcount on the clock. Any previously set clock on the object
|
|
* is unreffed.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
void
|
|
gst_element_set_clock (GstElement * element, GstClock * clock)
|
|
{
|
|
GstElementClass *oclass;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->set_clock)
|
|
oclass->set_clock (element, clock);
|
|
|
|
GST_LOCK (element);
|
|
gst_object_replace ((GstObject **) & element->clock, (GstObject *) clock);
|
|
GST_UNLOCK (element);
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_clock:
|
|
* @element: a #GstElement to get the clock of.
|
|
*
|
|
* Gets the clock of the element. If the element provides a clock,
|
|
* this function will return this clock. For elements that do not
|
|
* provide a clock, this function returns NULL.
|
|
*
|
|
* Returns: the #GstClock of the element. unref after usage.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstClock *
|
|
gst_element_get_clock (GstElement * element)
|
|
{
|
|
GstElementClass *oclass;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->get_clock)
|
|
return oclass->get_clock (element);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* gst_element_clock_wait:
|
|
* @element: a #GstElement.
|
|
* @id: the #GstClock to use.
|
|
* @jitter: the difference between requested time and actual time.
|
|
*
|
|
* Waits for a specific time on the clock.
|
|
*
|
|
* Returns: the #GstClockReturn result of the wait operation.
|
|
*/
|
|
GstClockReturn
|
|
gst_element_clock_wait (GstElement * element, GstClockID id,
|
|
GstClockTimeDiff * jitter)
|
|
{
|
|
GstClockReturn res;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), GST_CLOCK_ERROR);
|
|
|
|
if (GST_ELEMENT_SCHEDULER (element)) {
|
|
GST_CAT_DEBUG (GST_CAT_CLOCK, "waiting on scheduler clock with id %d");
|
|
res =
|
|
gst_scheduler_clock_wait (GST_ELEMENT_SCHEDULER (element), element, id,
|
|
jitter);
|
|
} else {
|
|
GST_CAT_DEBUG (GST_CAT_CLOCK, "no scheduler, returning GST_CLOCK_OK");
|
|
res = GST_CLOCK_OK;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
#undef GST_CAT_DEFAULT
|
|
#define GST_CAT_DEFAULT GST_CAT_CLOCK
|
|
/**
|
|
* gst_element_get_time:
|
|
* @element: element to query
|
|
*
|
|
* Query the element's time. FIXME: The element must use
|
|
*
|
|
* Returns: the current stream time in #GST_STATE_PLAYING,
|
|
* the element base time in #GST_STATE_PAUSED,
|
|
* or #GST_CLOCK_TIME_NONE otherwise.
|
|
*/
|
|
/* FIXME: this should always return time on the same scale. Now it returns
|
|
* the (absolute) base_time in PAUSED and the (current running) time in
|
|
* PLAYING.
|
|
* Solution: have a get_base_time and make the element subtract if it needs
|
|
* to. In PAUSED return the same as PLAYING, ie. the current timestamp where
|
|
* the element is at according to the provided clock.
|
|
*/
|
|
GstClockTime
|
|
gst_element_get_time (GstElement * element)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), GST_CLOCK_TIME_NONE);
|
|
|
|
if (element->clock == NULL) {
|
|
GST_WARNING_OBJECT (element, "element queries time but has no clock");
|
|
return GST_CLOCK_TIME_NONE;
|
|
}
|
|
switch (element->current_state) {
|
|
case GST_STATE_NULL:
|
|
case GST_STATE_READY:
|
|
return GST_CLOCK_TIME_NONE;
|
|
case GST_STATE_PAUSED:
|
|
return element->base_time;
|
|
case GST_STATE_PLAYING:
|
|
return gst_clock_get_time (element->clock) - element->base_time;
|
|
default:
|
|
g_assert_not_reached ();
|
|
return GST_CLOCK_TIME_NONE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_wait:
|
|
* @element: element that should wait
|
|
* @timestamp: what timestamp to wait on
|
|
*
|
|
* Waits until the given relative time stamp for the element has arrived.
|
|
* When this function returns successfully, the relative time point specified
|
|
* in the timestamp has passed for this element.
|
|
* <note>This function can only be called on elements in
|
|
* #GST_STATE_PLAYING</note>
|
|
*
|
|
* Returns: TRUE on success.
|
|
*/
|
|
gboolean
|
|
gst_element_wait (GstElement * element, GstClockTime timestamp)
|
|
{
|
|
GstClockID id;
|
|
GstClockReturn ret;
|
|
GstClockTime time;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
g_return_val_if_fail (GST_IS_CLOCK (element->clock), FALSE);
|
|
g_return_val_if_fail (element->current_state == GST_STATE_PLAYING, FALSE);
|
|
g_return_val_if_fail (GST_CLOCK_TIME_IS_VALID (timestamp), FALSE);
|
|
|
|
/* shortcut when we're already late... */
|
|
time = gst_element_get_time (element);
|
|
GST_CAT_LOG_OBJECT (GST_CAT_CLOCK, element, "element time %" GST_TIME_FORMAT,
|
|
GST_TIME_ARGS (time));
|
|
if (time >= timestamp) {
|
|
GST_CAT_INFO_OBJECT (GST_CAT_CLOCK, element,
|
|
"called gst_element_wait (% " GST_TIME_FORMAT ") and was late (%"
|
|
GST_TIME_FORMAT, GST_TIME_ARGS (timestamp),
|
|
GST_TIME_ARGS (gst_element_get_time (element)));
|
|
return TRUE;
|
|
}
|
|
|
|
id = gst_clock_new_single_shot_id (element->clock,
|
|
element->base_time + timestamp);
|
|
ret = gst_element_clock_wait (element, id, NULL);
|
|
gst_clock_id_unref (id);
|
|
|
|
return ret == GST_CLOCK_OK;
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_time:
|
|
* @element: element to set time on
|
|
* @time: time to set
|
|
*
|
|
* Sets the current time of the element. This function can be used when handling
|
|
* discont events. You can only call this function on an element with a clock in
|
|
* #GST_STATE_PAUSED or #GST_STATE_PLAYING. You might want to have a look at
|
|
* gst_element_adjust_time(), if you want to adjust by a difference as that is
|
|
* more accurate.
|
|
*/
|
|
void
|
|
gst_element_set_time (GstElement * element, GstClockTime time)
|
|
{
|
|
gst_element_set_time_delay (element, time, 0);
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_time_delay:
|
|
* @element: element to set time on
|
|
* @time: time to set
|
|
* @delay: a delay to discount from the given time
|
|
*
|
|
* Sets the current time of the element to time - delay. This function can be
|
|
* used when handling discont events in elements writing to an external buffer,
|
|
* i. e., an audio sink that writes to a sound card that buffers the sound
|
|
* before playing it. The delay should be the current buffering delay.
|
|
*
|
|
* You can only call this function on an element with a clock in
|
|
* #GST_STATE_PAUSED or #GST_STATE_PLAYING. You might want to have a look at
|
|
* gst_element_adjust_time(), if you want to adjust by a difference as that is
|
|
* more accurate.
|
|
*/
|
|
void
|
|
gst_element_set_time_delay (GstElement * element, GstClockTime time,
|
|
GstClockTime delay)
|
|
{
|
|
GstClockTime event_time;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
g_return_if_fail (GST_IS_CLOCK (element->clock));
|
|
g_return_if_fail (element->current_state >= GST_STATE_PAUSED);
|
|
g_return_if_fail (time >= delay);
|
|
|
|
switch (element->current_state) {
|
|
case GST_STATE_PAUSED:
|
|
element->base_time = time - delay;
|
|
break;
|
|
case GST_STATE_PLAYING:
|
|
event_time = GST_CLOCK_TIME_NONE;
|
|
//gst_clock_get_event_time_delay (element->clock, delay);
|
|
GST_CAT_LOG_OBJECT (GST_CAT_CLOCK, element,
|
|
"clock time %" GST_TIME_FORMAT ": setting element time to %"
|
|
GST_TIME_FORMAT, GST_TIME_ARGS (event_time), GST_TIME_ARGS (time));
|
|
element->base_time = event_time - time;
|
|
break;
|
|
default:
|
|
g_assert_not_reached ();
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_adjust_time:
|
|
* @element: element to adjust time on
|
|
* @diff: difference to adjust
|
|
*
|
|
* Adjusts the current time of the element by the specified difference. This
|
|
* function can be used when handling discont events. You can only call this
|
|
* function on an element with a clock in #GST_STATE_PAUSED or
|
|
* #GST_STATE_PLAYING. It is more accurate than gst_element_set_time().
|
|
*/
|
|
void
|
|
gst_element_adjust_time (GstElement * element, GstClockTimeDiff diff)
|
|
{
|
|
GstClockTime time;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
g_return_if_fail (GST_IS_CLOCK (element->clock));
|
|
g_return_if_fail (element->current_state >= GST_STATE_PAUSED);
|
|
|
|
switch (element->current_state) {
|
|
case GST_STATE_PAUSED:
|
|
if (diff < 0 && element->base_time < abs (diff)) {
|
|
g_warning ("attempted to set the current time of element %s below 0",
|
|
GST_OBJECT_NAME (element));
|
|
element->base_time = 0;
|
|
} else {
|
|
element->base_time += diff;
|
|
}
|
|
break;
|
|
case GST_STATE_PLAYING:
|
|
time = gst_clock_get_time (element->clock);
|
|
if (time < element->base_time - diff) {
|
|
g_warning ("attempted to set the current time of element %s below 0",
|
|
GST_OBJECT_NAME (element));
|
|
element->base_time = time;
|
|
} else {
|
|
element->base_time -= diff;
|
|
}
|
|
break;
|
|
default:
|
|
g_assert_not_reached ();
|
|
break;
|
|
}
|
|
}
|
|
|
|
#undef GST_CAT_DEFAULT
|
|
|
|
#ifndef GST_DISABLE_INDEX
|
|
/**
|
|
* gst_element_is_indexable:
|
|
* @element: a #GstElement.
|
|
*
|
|
* Queries if the element can be indexed.
|
|
*
|
|
* Returns: TRUE if the element can be indexed.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_is_indexable (GstElement * element)
|
|
{
|
|
gboolean result = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), result);
|
|
|
|
result = (GST_ELEMENT_GET_CLASS (element)->set_index != NULL);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_index:
|
|
* @element: a #GstElement.
|
|
* @index: a #GstIndex.
|
|
*
|
|
* Set the specified GstIndex on the element.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
void
|
|
gst_element_set_index (GstElement * element, GstIndex * index)
|
|
{
|
|
GstElementClass *oclass;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
g_return_if_fail (GST_IS_INDEX (index));
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->set_index)
|
|
oclass->set_index (element, index);
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_index:
|
|
* @element: a #GstElement.
|
|
*
|
|
* Gets the index from the element.
|
|
*
|
|
* Returns: a #GstIndex or NULL when no index was set on the
|
|
* element. unref after usage.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstIndex *
|
|
gst_element_get_index (GstElement * element)
|
|
{
|
|
GstElementClass *oclass;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->get_index)
|
|
return oclass->get_index (element);
|
|
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* gst_element_release_locks:
|
|
* @element: a #GstElement to release all locks on.
|
|
*
|
|
* Instruct the element to release all the locks it is holding, such as
|
|
* blocking reads, waiting for the clock, ...
|
|
*
|
|
* Returns: TRUE if the locks could be released.
|
|
*/
|
|
gboolean
|
|
gst_element_release_locks (GstElement * element)
|
|
{
|
|
GstElementClass *oclass;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->release_locks)
|
|
return oclass->release_locks (element);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_element_add_pad:
|
|
* @element: a #GstElement to add the pad to.
|
|
* @pad: the #GstPad to add to the element.
|
|
*
|
|
* Adds a pad (link point) to @element. @pad's parent will be set to @element;
|
|
* see gst_object_set_parent() for refcounting information.
|
|
*
|
|
* Pads are automatically activated when the element is in state PLAYING.
|
|
*
|
|
* The pad and the element should be unlocked when calling this function.
|
|
*
|
|
* Returns: TRUE if the pad could be added. This function can fail when
|
|
* passing bad arguments or when a pad with the same name already existed.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_add_pad (GstElement * element, GstPad * pad)
|
|
{
|
|
gchar *pad_name;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
/* locking pad to look at the name */
|
|
GST_LOCK (pad);
|
|
pad_name = g_strdup (GST_PAD_NAME (pad));
|
|
GST_CAT_INFO_OBJECT (GST_CAT_ELEMENT_PADS, element, "adding pad '%s'",
|
|
GST_STR_NULL (pad_name));
|
|
GST_UNLOCK (pad);
|
|
|
|
/* then check to see if there's already a pad by that name here */
|
|
GST_LOCK (element);
|
|
if (G_UNLIKELY (!gst_object_check_uniqueness (element->pads, pad_name)))
|
|
goto name_exists;
|
|
|
|
/* try to set the pad's parent */
|
|
if (G_UNLIKELY (!gst_object_set_parent (GST_OBJECT_CAST (pad),
|
|
GST_OBJECT_CAST (element))))
|
|
goto had_parent;
|
|
|
|
g_free (pad_name);
|
|
|
|
/* add it to the list */
|
|
switch (gst_pad_get_direction (pad)) {
|
|
case GST_PAD_SRC:
|
|
element->srcpads = g_list_prepend (element->srcpads, pad);
|
|
element->numsrcpads++;
|
|
break;
|
|
case GST_PAD_SINK:
|
|
element->sinkpads = g_list_prepend (element->sinkpads, pad);
|
|
element->numsinkpads++;
|
|
break;
|
|
default:
|
|
/* can happen for ghost pads */
|
|
break;
|
|
}
|
|
element->pads = g_list_prepend (element->pads, pad);
|
|
element->numpads++;
|
|
element->pads_cookie++;
|
|
GST_UNLOCK (element);
|
|
|
|
/* emit the NEW_PAD signal */
|
|
g_signal_emit (G_OBJECT (element), gst_element_signals[NEW_PAD], 0, pad);
|
|
|
|
return TRUE;
|
|
|
|
/* ERROR cases */
|
|
name_exists:
|
|
{
|
|
g_critical ("Padname %s is not unique in element %s, not adding",
|
|
pad_name, GST_ELEMENT_NAME (element));
|
|
GST_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_UNLOCK (element);
|
|
g_free (pad_name);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_add_ghost_pad:
|
|
* @element: a #GstElement to add the ghost pad to.
|
|
* @pad: the #GstPad from which the new ghost pad will be created.
|
|
* @name: the name of the new ghost pad, or NULL to assign a unique name
|
|
* automatically.
|
|
*
|
|
* Creates a ghost pad from @pad, and adds it to @element via
|
|
* gst_element_add_pad().
|
|
*
|
|
* Returns: the added ghost #GstPad, or NULL on error.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstPad *
|
|
gst_element_add_ghost_pad (GstElement * element, GstPad * pad,
|
|
const gchar * name)
|
|
{
|
|
GstPad *ghostpad;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
ghostpad = gst_ghost_pad_new (name, pad);
|
|
|
|
if (!gst_element_add_pad (element, ghostpad)) {
|
|
gst_object_unref (GST_OBJECT (ghostpad));
|
|
ghostpad = NULL;
|
|
}
|
|
|
|
return ghostpad;
|
|
}
|
|
|
|
/**
|
|
* gst_element_remove_pad:
|
|
* @element: a #GstElement to remove pad from.
|
|
* @pad: the #GstPad to remove from the element.
|
|
*
|
|
* Removes @pad from @element. @pad will be destroyed if it has not been
|
|
* referenced elsewhere.
|
|
*
|
|
* Returns: TRUE if the pad could be removed. Can return FALSE if the
|
|
* pad is not belonging to the provided element or when wrong parameters
|
|
* are passed to this function.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_remove_pad (GstElement * element, GstPad * pad)
|
|
{
|
|
gchar *pad_name;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
/* locking pad to look at the name and parent */
|
|
GST_LOCK (pad);
|
|
pad_name = g_strdup (GST_PAD_NAME (pad));
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_ELEMENT_PADS, element, "removing pad '%s'",
|
|
GST_STR_NULL (pad_name));
|
|
|
|
if (G_UNLIKELY (GST_PAD_PARENT (pad) != element))
|
|
goto not_our_pad;
|
|
GST_UNLOCK (pad);
|
|
|
|
g_free (pad_name);
|
|
|
|
/* FIXME, is this redundant with pad disposal? */
|
|
if (GST_IS_REAL_PAD (pad)) {
|
|
GstPad *peer = gst_pad_get_peer (pad);
|
|
|
|
/* unlink */
|
|
if (peer != NULL) {
|
|
/* 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, GST_PAD_CAST (peer));
|
|
else
|
|
gst_pad_unlink (GST_PAD_CAST (peer), pad);
|
|
|
|
gst_object_unref (GST_OBJECT (peer));
|
|
}
|
|
} else if (GST_IS_GHOST_PAD (pad)) {
|
|
g_object_set (pad, "real-pad", NULL, NULL);
|
|
}
|
|
|
|
GST_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:
|
|
/* can happen for ghost pads */
|
|
break;
|
|
}
|
|
element->pads = g_list_remove (element->pads, pad);
|
|
element->numpads--;
|
|
element->pads_cookie++;
|
|
GST_UNLOCK (element);
|
|
|
|
g_signal_emit (G_OBJECT (element), gst_element_signals[PAD_REMOVED], 0, pad);
|
|
|
|
gst_object_unparent (GST_OBJECT (pad));
|
|
|
|
return TRUE;
|
|
|
|
not_our_pad:
|
|
{
|
|
/* FIXME, locking order? */
|
|
GST_LOCK (element);
|
|
g_critical ("Padname %s:%s does not belong to element %s when removing",
|
|
GST_ELEMENT_NAME (GST_PAD_PARENT (pad)), GST_PAD_NAME (pad),
|
|
GST_ELEMENT_NAME (element));
|
|
GST_UNLOCK (element);
|
|
GST_UNLOCK (pad);
|
|
g_free (pad_name);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_no_more_pads:
|
|
* @element: a #GstElement
|
|
*
|
|
* Use this function to signal that the element does not expect any more pads
|
|
* to show up in the current pipeline. This function should be called whenever
|
|
* pads have been added by the element itself. Elements with GST_PAD_SOMETIMES
|
|
* pad templates use this in combination with autopluggers to figure out that
|
|
* the element is done initializing its pads.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
void
|
|
gst_element_no_more_pads (GstElement * element)
|
|
{
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
g_signal_emit (element, gst_element_signals[NO_MORE_PADS], 0);
|
|
}
|
|
|
|
static gint
|
|
pad_compare_name (GstPad * pad1, const gchar * name)
|
|
{
|
|
gint result;
|
|
|
|
GST_LOCK (pad1);
|
|
result = strcmp (GST_PAD_NAME (pad1), name);
|
|
GST_UNLOCK (pad1);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_static_pad:
|
|
* @element: a #GstElement to find a static pad of.
|
|
* @name: the name of the static #GstPad to retrieve.
|
|
*
|
|
* Retrieves a pad from @element by name. This version only retrieves
|
|
* already-existing (i.e. 'static') pads.
|
|
*
|
|
* Returns: the requested #GstPad if found, otherwise NULL. unref after
|
|
* usage.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstPad *
|
|
gst_element_get_static_pad (GstElement * element, const gchar * name)
|
|
{
|
|
GList *find;
|
|
GstPad *result = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
g_return_val_if_fail (name != NULL, NULL);
|
|
|
|
GST_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 (GST_OBJECT_CAST (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_UNLOCK (element);
|
|
|
|
return result;
|
|
}
|
|
|
|
static GstPad *
|
|
gst_element_request_pad (GstElement * element, GstPadTemplate * templ,
|
|
const gchar * name)
|
|
{
|
|
GstPad *newpad = NULL;
|
|
GstElementClass *oclass;
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->request_new_pad)
|
|
newpad = (oclass->request_new_pad) (element, templ, name);
|
|
|
|
return newpad;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_request_pad:
|
|
* @element: a #GstElement to find a request pad of.
|
|
* @name: the name of the request #GstPad to retrieve.
|
|
*
|
|
* Retrieves a pad from the element by name. This version only retrieves
|
|
* request pads.
|
|
*
|
|
* Returns: requested #GstPad if found, otherwise NULL.
|
|
*/
|
|
GstPad *
|
|
gst_element_get_request_pad (GstElement * element, const gchar * name)
|
|
{
|
|
GstPadTemplate *templ = NULL;
|
|
GstPad *pad;
|
|
const gchar *req_name = NULL;
|
|
gboolean templ_found = FALSE;
|
|
GList *list;
|
|
gint n;
|
|
const gchar *data;
|
|
gchar *str, *endptr = NULL;
|
|
GstElementClass *class;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
g_return_val_if_fail (name != NULL, NULL);
|
|
|
|
class = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (strstr (name, "%")) {
|
|
templ = gst_element_class_get_pad_template (class, name);
|
|
req_name = NULL;
|
|
if (templ)
|
|
templ_found = TRUE;
|
|
} else {
|
|
list = gst_element_class_get_pad_template_list (class);
|
|
while (!templ_found && list) {
|
|
templ = (GstPadTemplate *) list->data;
|
|
if (templ->presence == GST_PAD_REQUEST) {
|
|
/* Because of sanity checks in gst_pad_template_new(), we know that %s
|
|
and %d, occurring at the end of the name_template, are the only
|
|
possibilities. */
|
|
GST_CAT_DEBUG (GST_CAT_PADS, "comparing %s to %s", name,
|
|
templ->name_template);
|
|
if ((str = strchr (templ->name_template, '%'))
|
|
&& strncmp (templ->name_template, name,
|
|
str - templ->name_template) == 0
|
|
&& strlen (name) > str - templ->name_template) {
|
|
data = name + (str - templ->name_template);
|
|
if (*(str + 1) == 'd') {
|
|
/* it's an int */
|
|
n = (gint) strtol (data, &endptr, 10);
|
|
if (endptr && *endptr == '\0') {
|
|
templ_found = TRUE;
|
|
req_name = name;
|
|
break;
|
|
}
|
|
} else {
|
|
/* it's a string */
|
|
templ_found = TRUE;
|
|
req_name = name;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
list = list->next;
|
|
}
|
|
}
|
|
|
|
if (!templ_found)
|
|
return NULL;
|
|
|
|
pad = gst_element_request_pad (element, templ, req_name);
|
|
|
|
return pad;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_pad:
|
|
* @element: a #GstElement.
|
|
* @name: the name of the pad to retrieve.
|
|
*
|
|
* Retrieves a pad from @element by name. Tries gst_element_get_static_pad()
|
|
* first, then gst_element_get_request_pad().
|
|
*
|
|
* Returns: the #GstPad if found, otherwise %NULL. Unref after usage.
|
|
*/
|
|
GstPad *
|
|
gst_element_get_pad (GstElement * element, const gchar * name)
|
|
{
|
|
GstPad *pad;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
g_return_val_if_fail (name != NULL, NULL);
|
|
|
|
pad = gst_element_get_static_pad (element, name);
|
|
if (!pad)
|
|
pad = gst_element_get_request_pad (element, name);
|
|
|
|
return pad;
|
|
}
|
|
|
|
GstIteratorItem
|
|
iterate_pad (GstIterator * it, GstPad * pad)
|
|
{
|
|
gst_object_ref (GST_OBJECT_CAST (pad));
|
|
return GST_ITERATOR_ITEM_PASS;
|
|
}
|
|
|
|
/**
|
|
* gst_element_iterate_pads:
|
|
* @element: a #GstElement to iterate pads of.
|
|
*
|
|
* Retrieves an iterattor of @element's pads.
|
|
*
|
|
* Returns: the #GstIterator of pads.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstIterator *
|
|
gst_element_iterate_pads (GstElement * element)
|
|
{
|
|
GstIterator *result;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
GST_LOCK (element);
|
|
gst_object_ref (GST_OBJECT (element));
|
|
result = gst_iterator_new_list (GST_GET_LOCK (element),
|
|
&element->pads_cookie,
|
|
&element->pads,
|
|
element,
|
|
(GstIteratorItemFunction) iterate_pad,
|
|
(GstIteratorDisposeFunction) gst_object_unref);
|
|
GST_UNLOCK (element);
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_element_class_add_pad_template:
|
|
* @klass: the #GstElementClass to add the pad template to.
|
|
* @templ: a #GstPadTemplate to add to the element class.
|
|
*
|
|
* Adds a padtemplate to an element class. This is mainly used in the _base_init
|
|
* functions of classes.
|
|
*/
|
|
void
|
|
gst_element_class_add_pad_template (GstElementClass * klass,
|
|
GstPadTemplate * templ)
|
|
{
|
|
g_return_if_fail (GST_IS_ELEMENT_CLASS (klass));
|
|
g_return_if_fail (GST_IS_PAD_TEMPLATE (templ));
|
|
|
|
/* avoid registering pad templates with the same name */
|
|
g_return_if_fail (gst_element_class_get_pad_template (klass,
|
|
templ->name_template) == NULL);
|
|
|
|
klass->padtemplates = g_list_append (klass->padtemplates,
|
|
gst_object_ref (GST_OBJECT (templ)));
|
|
klass->numpadtemplates++;
|
|
}
|
|
|
|
/**
|
|
* gst_element_class_set_details:
|
|
* @klass: class to set details for
|
|
* @details: details to set
|
|
*
|
|
* Sets the detailed information for a #GstElementClass.
|
|
* <note>This function is for use in _base_init functions only.</note>
|
|
*/
|
|
void
|
|
gst_element_class_set_details (GstElementClass * klass,
|
|
const GstElementDetails * details)
|
|
{
|
|
g_return_if_fail (GST_IS_ELEMENT_CLASS (klass));
|
|
g_return_if_fail (GST_IS_ELEMENT_DETAILS (details));
|
|
|
|
__gst_element_details_copy (&klass->details, details);
|
|
}
|
|
|
|
/**
|
|
* gst_element_class_get_pad_template_list:
|
|
* @element_class: a #GstElementClass to get pad templates of.
|
|
*
|
|
* Retrieves a list of the pad templates associated with @element_class. The
|
|
* list must not be modified by the calling code.
|
|
* <note>If you use this function in the #GInstanceInitFunc of an object class
|
|
* that has subclasses, make sure to pass the g_class parameter of the
|
|
* #GInstanceInitFunc here.</note>
|
|
*
|
|
* Returns: the #GList of padtemplates.
|
|
*/
|
|
GList *
|
|
gst_element_class_get_pad_template_list (GstElementClass * element_class)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT_CLASS (element_class), NULL);
|
|
|
|
return element_class->padtemplates;
|
|
}
|
|
|
|
/**
|
|
* gst_element_class_get_pad_template:
|
|
* @element_class: a #GstElementClass to get the pad template of.
|
|
* @name: the name of the #GstPadTemplate to get.
|
|
*
|
|
* Retrieves a padtemplate from @element_class with the given name.
|
|
* <note>If you use this function in the #GInstanceInitFunc of an object class
|
|
* that has subclasses, make sure to pass the g_class parameter of the
|
|
* #GInstanceInitFunc here.</note>
|
|
*
|
|
* Returns: the #GstPadTemplate with the given name, or NULL if none was found.
|
|
* No unreferencing is necessary.
|
|
*/
|
|
GstPadTemplate *
|
|
gst_element_class_get_pad_template (GstElementClass * element_class,
|
|
const gchar * name)
|
|
{
|
|
GList *padlist;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT_CLASS (element_class), NULL);
|
|
g_return_val_if_fail (name != NULL, NULL);
|
|
|
|
padlist = gst_element_class_get_pad_template_list (element_class);
|
|
|
|
while (padlist) {
|
|
GstPadTemplate *padtempl = (GstPadTemplate *) padlist->data;
|
|
|
|
if (strcmp (padtempl->name_template, name) == 0)
|
|
return padtempl;
|
|
|
|
padlist = g_list_next (padlist);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
gst_element_error_func (GstElement * element, GstElement * source,
|
|
GError * error, gchar * debug)
|
|
{
|
|
GstObject *parent = GST_OBJECT_PARENT (element);
|
|
|
|
/* tell the parent */
|
|
if (parent) {
|
|
gst_object_ref (GST_OBJECT (element));
|
|
gst_object_ref (parent);
|
|
GST_CAT_DEBUG (GST_CAT_ERROR_SYSTEM,
|
|
"forwarding error \"%s\" from %s to %s", error->message,
|
|
GST_ELEMENT_NAME (element), GST_OBJECT_NAME (parent));
|
|
|
|
g_signal_emit (G_OBJECT (parent),
|
|
gst_element_signals[ERROR], 0, source, error, debug);
|
|
GST_CAT_DEBUG (GST_CAT_ERROR_SYSTEM, "forwarded error \"%s\" from %s to %s",
|
|
error->message, GST_ELEMENT_NAME (element), GST_OBJECT_NAME (parent));
|
|
gst_object_unref (GST_OBJECT (element));
|
|
gst_object_unref (GST_OBJECT (parent));
|
|
}
|
|
}
|
|
|
|
static GstPad *
|
|
gst_element_get_random_pad (GstElement * element, GstPadDirection dir)
|
|
{
|
|
GstPad *result = NULL;
|
|
GList *pads;
|
|
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "getting a random pad");
|
|
|
|
GST_LOCK (element);
|
|
switch (dir) {
|
|
case GST_PAD_SRC:
|
|
pads = element->srcpads;
|
|
break;
|
|
case GST_PAD_SINK:
|
|
pads = element->sinkpads;
|
|
break;
|
|
default:
|
|
g_warning ("unknown pad direction");
|
|
return NULL;
|
|
}
|
|
for (; pads; pads = g_list_next (pads)) {
|
|
GstPad *pad = GST_PAD (pads->data);
|
|
|
|
GST_LOCK (pad);
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "checking pad %s:%s",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
|
|
if (GST_PAD_IS_LINKED (pad)) {
|
|
GST_UNLOCK (pad);
|
|
result = pad;
|
|
break;
|
|
} else {
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "pad %s:%s is not linked",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
}
|
|
GST_UNLOCK (pad);
|
|
}
|
|
if (result)
|
|
gst_object_ref (GST_OBJECT (result));
|
|
|
|
GST_UNLOCK (element);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_event_masks:
|
|
* @element: a #GstElement to query
|
|
*
|
|
* Get an array of event masks from the element.
|
|
* If the element doesn't implement an event masks function,
|
|
* the query will be forwarded to a random linked sink pad.
|
|
*
|
|
* Returns: An array of #GstEventMask elements. The array
|
|
* cannot be modified or freed.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
const GstEventMask *
|
|
gst_element_get_event_masks (GstElement * element)
|
|
{
|
|
GstElementClass *oclass;
|
|
const GstEventMask *result = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->get_event_masks) {
|
|
result = oclass->get_event_masks (element);
|
|
} else {
|
|
GstPad *pad = gst_element_get_random_pad (element, GST_PAD_SINK);
|
|
|
|
if (pad) {
|
|
GstPad *peer = gst_pad_get_peer (pad);
|
|
|
|
if (peer) {
|
|
result = gst_pad_get_event_masks (peer);
|
|
gst_object_unref (GST_OBJECT (peer));
|
|
}
|
|
gst_object_unref (GST_OBJECT (pad));
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_send_event:
|
|
* @element: a #GstElement to send the event to.
|
|
* @event: the #GstEvent to send to the element.
|
|
*
|
|
* Sends an event to an element. If the element doesn't
|
|
* implement an event handler, the event will be forwarded
|
|
* to a random sink pad. This function takes owership of the
|
|
* provided event so you should _ref it if you want to reuse
|
|
* the event after this call.
|
|
*
|
|
* Returns: TRUE if the event was handled.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_send_event (GstElement * element, GstEvent * event)
|
|
{
|
|
GstElementClass *oclass;
|
|
gboolean result = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
g_return_val_if_fail (event != NULL, FALSE);
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->send_event) {
|
|
result = oclass->send_event (element, event);
|
|
} else {
|
|
GstPad *pad = gst_element_get_random_pad (element, GST_PAD_SINK);
|
|
|
|
if (pad) {
|
|
GstPad *peer = gst_pad_get_peer (pad);
|
|
|
|
if (peer) {
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
|
|
"sending event to random pad %s:%s", GST_DEBUG_PAD_NAME (pad));
|
|
|
|
result = gst_pad_send_event (peer, event);
|
|
gst_object_unref (GST_OBJECT (peer));
|
|
}
|
|
gst_object_unref (GST_OBJECT (pad));
|
|
}
|
|
}
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "can't send event on element %s",
|
|
GST_ELEMENT_NAME (element));
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_seek:
|
|
* @element: a #GstElement to send the event to.
|
|
* @seek_type: the method to use for seeking.
|
|
* @offset: the offset to seek to.
|
|
*
|
|
* Sends a seek event to an element.
|
|
*
|
|
* Returns: TRUE if the event was handled.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_seek (GstElement * element, GstSeekType seek_type, guint64 offset)
|
|
{
|
|
GstEvent *event = gst_event_new_seek (seek_type, offset);
|
|
gboolean result;
|
|
|
|
result = gst_element_send_event (element, event);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_query_types:
|
|
* @element: a #GstElement to query
|
|
*
|
|
* Get an array of query types from the element.
|
|
* If the element doesn't implement a query types function,
|
|
* the query will be forwarded to a random sink pad.
|
|
*
|
|
* Returns: An array of #GstQueryType elements that should not
|
|
* be freed or modified.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
const GstQueryType *
|
|
gst_element_get_query_types (GstElement * element)
|
|
{
|
|
GstElementClass *oclass;
|
|
const GstQueryType *result = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->get_query_types) {
|
|
result = oclass->get_query_types (element);
|
|
} else {
|
|
GstPad *pad = gst_element_get_random_pad (element, GST_PAD_SINK);
|
|
|
|
if (pad) {
|
|
GstPad *peer = gst_pad_get_peer (pad);
|
|
|
|
if (peer) {
|
|
result = gst_pad_get_query_types (peer);
|
|
|
|
gst_object_unref (GST_OBJECT (peer));
|
|
}
|
|
gst_object_unref (GST_OBJECT (pad));
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_query:
|
|
* @element: a #GstElement to perform the query on.
|
|
* @type: the #GstQueryType.
|
|
* @format: the #GstFormat pointer to hold the format of the result.
|
|
* @value: the pointer to the value of the result.
|
|
*
|
|
* Performs a query on the given element. If the format is set
|
|
* to GST_FORMAT_DEFAULT and this function returns TRUE, the
|
|
* format pointer will hold the default format.
|
|
* For element that don't implement a query handler, this function
|
|
* forwards the query to a random usable sinkpad of this element.
|
|
*
|
|
* Returns: TRUE if the query could be performed.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_query (GstElement * element, GstQueryType type,
|
|
GstFormat * format, gint64 * value)
|
|
{
|
|
GstElementClass *oclass;
|
|
gboolean result = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
g_return_val_if_fail (format != NULL, FALSE);
|
|
g_return_val_if_fail (value != NULL, FALSE);
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->query) {
|
|
result = oclass->query (element, type, format, value);
|
|
} else {
|
|
GstPad *pad = gst_element_get_random_pad (element, GST_PAD_SRC);
|
|
|
|
if (pad) {
|
|
result = gst_pad_query (pad, type, format, value);
|
|
|
|
gst_object_unref (GST_OBJECT (pad));
|
|
} else {
|
|
pad = gst_element_get_random_pad (element, GST_PAD_SINK);
|
|
if (pad) {
|
|
GstPad *peer = gst_pad_get_peer (pad);
|
|
|
|
if (peer) {
|
|
result = gst_pad_query (peer, type, format, value);
|
|
|
|
gst_object_unref (GST_OBJECT (peer));
|
|
}
|
|
gst_object_unref (GST_OBJECT (pad));
|
|
}
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_formats:
|
|
* @element: a #GstElement to query
|
|
*
|
|
* Get an array of formats from the element.
|
|
* If the element doesn't implement a formats function,
|
|
* the query will be forwarded to a random sink pad.
|
|
*
|
|
* Returns: An array of #GstFormat elements.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
const GstFormat *
|
|
gst_element_get_formats (GstElement * element)
|
|
{
|
|
GstElementClass *oclass;
|
|
const GstFormat *result = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->get_formats) {
|
|
result = oclass->get_formats (element);
|
|
} else {
|
|
GstPad *pad = gst_element_get_random_pad (element, GST_PAD_SINK);
|
|
|
|
if (pad) {
|
|
GstPad *peer = gst_pad_get_peer (pad);
|
|
|
|
if (peer) {
|
|
result = gst_pad_get_formats (peer);
|
|
|
|
gst_object_unref (GST_OBJECT (peer));
|
|
}
|
|
gst_object_unref (GST_OBJECT (pad));
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_convert:
|
|
* @element: a #GstElement to invoke the converter on.
|
|
* @src_format: the source #GstFormat.
|
|
* @src_value: the source value.
|
|
* @dest_format: a pointer to the destination #GstFormat.
|
|
* @dest_value: a pointer to the destination value.
|
|
*
|
|
* Invokes a conversion on the element.
|
|
* If the element doesn't implement a convert function,
|
|
* the query will be forwarded to a random sink pad.
|
|
*
|
|
* Returns: TRUE if the conversion could be performed.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_convert (GstElement * element,
|
|
GstFormat src_format, gint64 src_value,
|
|
GstFormat * dest_format, gint64 * dest_value)
|
|
{
|
|
GstElementClass *oclass;
|
|
gboolean result = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
g_return_val_if_fail (dest_format != NULL, FALSE);
|
|
g_return_val_if_fail (dest_value != NULL, FALSE);
|
|
|
|
if (src_format == *dest_format) {
|
|
*dest_value = src_value;
|
|
return TRUE;
|
|
}
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->convert) {
|
|
result = oclass->convert (element,
|
|
src_format, src_value, dest_format, dest_value);
|
|
} else {
|
|
GstPad *pad = gst_element_get_random_pad (element, GST_PAD_SINK);
|
|
|
|
if (pad) {
|
|
GstPad *peer = gst_pad_get_peer (pad);
|
|
|
|
if (peer) {
|
|
result = gst_pad_convert (peer,
|
|
src_format, src_value, dest_format, dest_value);
|
|
|
|
gst_object_unref (GST_OBJECT (peer));
|
|
}
|
|
gst_object_unref (GST_OBJECT (pad));
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* _gst_element_error_printf:
|
|
* @format: the printf-like format to use, or NULL
|
|
*
|
|
* This function is only used internally by the #gst_element_error macro.
|
|
*
|
|
* Returns: a newly allocated string, or NULL if the format was NULL or ""
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gchar *
|
|
_gst_element_error_printf (const gchar * format, ...)
|
|
{
|
|
va_list args;
|
|
gchar *buffer;
|
|
|
|
if (format == NULL)
|
|
return NULL;
|
|
if (format[0] == 0)
|
|
return NULL;
|
|
|
|
va_start (args, format);
|
|
buffer = g_strdup_vprintf (format, args);
|
|
va_end (args);
|
|
return buffer;
|
|
}
|
|
|
|
/**
|
|
* gst_element_error_full:
|
|
* @element: a #GstElement with the error.
|
|
* @domain: the GStreamer error domain this error belongs to.
|
|
* @code: the error code belonging to the domain
|
|
* @message: an allocated message to be used as a replacement for the default
|
|
* message connected to code, or NULL
|
|
* @debug: an allocated debug message to be used as a replacement for the
|
|
* default debugging information, or NULL
|
|
* @file: the source code file where the error was generated
|
|
* @function: the source code function where the error was generated
|
|
* @line: the source code line where the error was generated
|
|
*
|
|
* Signals an error condition on an element.
|
|
* This function is used internally by elements.
|
|
* It results in the "error" signal.
|
|
*/
|
|
void gst_element_error_full
|
|
(GstElement * element, GQuark domain, gint code, gchar * message,
|
|
gchar * debug, const gchar * file, const gchar * function, gint line)
|
|
{
|
|
GError *error = NULL;
|
|
gchar *name;
|
|
gchar *sent_message;
|
|
gchar *sent_debug;
|
|
|
|
/* checks */
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
/* check if we send the given message or the default error message */
|
|
if ((message == NULL) || (message[0] == 0)) {
|
|
/* we got this message from g_strdup_printf (""); */
|
|
g_free (message);
|
|
sent_message = gst_error_get_message (domain, code);
|
|
} else
|
|
sent_message = message;
|
|
|
|
if ((debug == NULL) || (debug[0] == 0)) {
|
|
/* we got this debug from g_strdup_printf (""); */
|
|
g_free (debug);
|
|
debug = NULL;
|
|
}
|
|
|
|
/* create error message */
|
|
GST_CAT_INFO (GST_CAT_ERROR_SYSTEM, "signaling error in %s: %s",
|
|
GST_ELEMENT_NAME (element), sent_message);
|
|
error = g_error_new_literal (domain, code, sent_message);
|
|
|
|
/* if the element was already in error, stop now */
|
|
if (GST_FLAG_IS_SET (element, GST_ELEMENT_IN_ERROR)) {
|
|
GST_CAT_INFO (GST_CAT_ERROR_SYSTEM, "recursive ERROR detected in %s",
|
|
GST_ELEMENT_NAME (element));
|
|
g_free (sent_message);
|
|
if (debug)
|
|
g_free (debug);
|
|
return;
|
|
}
|
|
|
|
GST_FLAG_SET (element, GST_ELEMENT_IN_ERROR);
|
|
|
|
/* emit the signal, make sure the element stays available */
|
|
gst_object_ref (GST_OBJECT (element));
|
|
name = gst_object_get_path_string (GST_OBJECT (element));
|
|
if (debug)
|
|
sent_debug = g_strdup_printf ("%s(%d): %s: %s:\n%s",
|
|
file, line, function, name, debug ? debug : "");
|
|
else
|
|
sent_debug = NULL;
|
|
g_free (debug);
|
|
g_free (name);
|
|
g_signal_emit (G_OBJECT (element), gst_element_signals[ERROR], 0, element,
|
|
error, sent_debug);
|
|
GST_CAT_INFO (GST_CAT_ERROR_SYSTEM, "signalled error in %s: %s",
|
|
GST_ELEMENT_NAME (element), sent_message);
|
|
|
|
/* tell the scheduler */
|
|
if (element->sched) {
|
|
gst_scheduler_error (element->sched, element);
|
|
}
|
|
|
|
if (GST_STATE (element) == GST_STATE_PLAYING) {
|
|
GstElementStateReturn ret;
|
|
|
|
ret = gst_element_set_state (element, GST_STATE_PAUSED);
|
|
if (ret != GST_STATE_SUCCESS) {
|
|
g_warning ("could not PAUSE element \"%s\" after error, help!",
|
|
GST_ELEMENT_NAME (element));
|
|
}
|
|
}
|
|
|
|
GST_FLAG_UNSET (element, GST_ELEMENT_IN_ERROR);
|
|
|
|
/* cleanup */
|
|
gst_object_unref (GST_OBJECT (element));
|
|
g_free (sent_message);
|
|
g_free (sent_debug);
|
|
g_error_free (error);
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* Returns: TRUE, if the element's state is locked.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_is_locked_state (GstElement * element)
|
|
{
|
|
gboolean result = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
|
|
GST_LOCK (element);
|
|
result = GST_FLAG_IS_SET (element, GST_ELEMENT_LOCKED_STATE);
|
|
GST_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.
|
|
*
|
|
* Returns: TRUE if the state was changed, FALSE if bad params were given or
|
|
* the element was already in the correct state.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_set_locked_state (GstElement * element, gboolean locked_state)
|
|
{
|
|
gboolean old;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
|
|
GST_LOCK (element);
|
|
old = GST_FLAG_IS_SET (element, GST_ELEMENT_LOCKED_STATE);
|
|
|
|
if (G_UNLIKELY (old == locked_state))
|
|
goto was_ok;
|
|
|
|
if (locked_state) {
|
|
GST_CAT_DEBUG (GST_CAT_STATES, "locking state of element %s",
|
|
GST_ELEMENT_NAME (element));
|
|
GST_FLAG_SET (element, GST_ELEMENT_LOCKED_STATE);
|
|
} else {
|
|
GST_CAT_DEBUG (GST_CAT_STATES, "unlocking state of element %s",
|
|
GST_ELEMENT_NAME (element));
|
|
GST_FLAG_UNSET (element, GST_ELEMENT_LOCKED_STATE);
|
|
}
|
|
GST_UNLOCK (element);
|
|
|
|
return TRUE;
|
|
|
|
was_ok:
|
|
GST_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.
|
|
*/
|
|
gboolean
|
|
gst_element_sync_state_with_parent (GstElement * element)
|
|
{
|
|
GstElement *parent;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
parent = GST_ELEMENT (GST_ELEMENT_PARENT (element));
|
|
g_return_val_if_fail (GST_IS_BIN (parent), FALSE);
|
|
|
|
GST_CAT_DEBUG (GST_CAT_STATES, "syncing state of element %s (%s) to %s (%s)",
|
|
GST_ELEMENT_NAME (element),
|
|
gst_element_state_get_name (GST_STATE (element)),
|
|
GST_ELEMENT_NAME (parent),
|
|
gst_element_state_get_name (GST_STATE (parent)));
|
|
|
|
if (gst_element_set_state (element, GST_STATE (parent)) == GST_STATE_FAILURE) {
|
|
return FALSE;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_state:
|
|
* @element: a #GstElement to get the state of.
|
|
*
|
|
* Gets the state of the element.
|
|
*
|
|
* Returns: the #GstElementState of the element.
|
|
*/
|
|
GstElementState
|
|
gst_element_get_state (GstElement * element)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), GST_STATE_VOID_PENDING);
|
|
|
|
return GST_STATE (element);
|
|
}
|
|
|
|
/**
|
|
* gst_element_wait_state_change:
|
|
* @element: a #GstElement to wait for a state change on.
|
|
*
|
|
* Waits and blocks until the element changed its state.
|
|
*/
|
|
void
|
|
gst_element_wait_state_change (GstElement * element)
|
|
{
|
|
g_mutex_lock (element->state_mutex);
|
|
g_cond_wait (element->state_cond, element->state_mutex);
|
|
g_mutex_unlock (element->state_mutex);
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_state:
|
|
* @element: a #GstElement to change state of.
|
|
* @state: the element's new #GstElementState.
|
|
*
|
|
* 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.
|
|
*
|
|
* Returns: TRUE if the state was successfully set.
|
|
* (using #GstElementStateReturn).
|
|
*/
|
|
GstElementStateReturn
|
|
gst_element_set_state (GstElement * element, GstElementState state)
|
|
{
|
|
GstElementClass *klass = GST_ELEMENT_GET_CLASS (element);
|
|
GstElementStateReturn ret;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), GST_STATE_FAILURE);
|
|
GST_DEBUG_OBJECT (element, "setting state to %s",
|
|
gst_element_state_get_name (state));
|
|
klass = GST_ELEMENT_GET_CLASS (element);
|
|
g_return_val_if_fail (klass->set_state, GST_STATE_FAILURE);
|
|
|
|
/* a set_state function is mandatory */
|
|
gst_object_ref (GST_OBJECT (element));
|
|
ret = klass->set_state (element, state);
|
|
gst_object_unref (GST_OBJECT (element));
|
|
|
|
return ret;
|
|
}
|
|
|
|
static GstElementStateReturn
|
|
gst_element_set_state_func (GstElement * element, GstElementState state)
|
|
{
|
|
GstElementClass *oclass;
|
|
GstElementState curpending;
|
|
GstElementStateReturn return_val = GST_STATE_SUCCESS;
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
/* start with the current state */
|
|
curpending = GST_STATE (element);
|
|
|
|
if (state == curpending) {
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"element is already in requested state %s, returning",
|
|
gst_element_state_get_name (state));
|
|
return GST_STATE_SUCCESS;
|
|
}
|
|
|
|
/* reentrancy issues with signals in change_state) */
|
|
gst_object_ref (GST_OBJECT (element));
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element, "setting state from %s to %s",
|
|
gst_element_state_get_name (curpending),
|
|
gst_element_state_get_name (state));
|
|
|
|
/* loop until the final requested state is set */
|
|
|
|
while (GST_STATE (element) != state
|
|
&& GST_STATE (element) != GST_STATE_VOID_PENDING) {
|
|
/* move the curpending state in the correct direction */
|
|
if (curpending < state)
|
|
curpending <<= 1;
|
|
else
|
|
curpending >>= 1;
|
|
|
|
/* set the pending state variable */
|
|
GST_STATE_PENDING (element) = curpending;
|
|
|
|
if (curpending != state) {
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"intermediate: setting state from %s to %s",
|
|
gst_element_state_get_name (GST_STATE (element)),
|
|
gst_element_state_get_name (curpending));
|
|
} else {
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"start: setting current state %s again",
|
|
gst_element_state_get_name (GST_STATE (element)));
|
|
}
|
|
|
|
/* call the state change function so it can set the state */
|
|
if (oclass->change_state)
|
|
return_val = (oclass->change_state) (element);
|
|
|
|
switch (return_val) {
|
|
case GST_STATE_FAILURE:
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
|
|
"have failed change_state return");
|
|
goto exit;
|
|
case GST_STATE_ASYNC:
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
|
|
"element will change state async");
|
|
goto exit;
|
|
case GST_STATE_SUCCESS:
|
|
/* Last thing we do is verify that a successful state change really
|
|
* did change the state... */
|
|
/* if it did not, this is an error - fix the element that does this */
|
|
if (GST_STATE (element) != curpending) {
|
|
g_warning ("element %s claimed state-change success,"
|
|
"but state didn't change to %s. State is %s (%s pending), "
|
|
"fix the element",
|
|
GST_ELEMENT_NAME (element),
|
|
gst_element_state_get_name (curpending),
|
|
gst_element_state_get_name (GST_STATE (element)),
|
|
gst_element_state_get_name (GST_STATE_PENDING (element)));
|
|
return_val = GST_STATE_FAILURE;
|
|
goto exit;
|
|
}
|
|
break;
|
|
default:
|
|
/* somebody added a GST_STATE_ and forgot to do stuff here ! */
|
|
g_assert_not_reached ();
|
|
}
|
|
}
|
|
|
|
exit:
|
|
gst_object_unref (GST_OBJECT (element));
|
|
|
|
return return_val;
|
|
}
|
|
|
|
static gboolean
|
|
gst_element_negotiate_pads (GstElement * element)
|
|
{
|
|
GList *pads;
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, element, "negotiating pads");
|
|
|
|
for (pads = GST_ELEMENT_PADS (element); pads; pads = g_list_next (pads)) {
|
|
GstPad *pad = GST_PAD (pads->data);
|
|
|
|
if (!GST_IS_REAL_PAD (pad))
|
|
continue;
|
|
|
|
/* if we have a link on this pad and it doesn't have caps
|
|
* allready, try to negotiate */
|
|
if (!gst_pad_is_negotiated (pad)) {
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, element,
|
|
"perform negotiate for %s:%s", GST_DEBUG_PAD_NAME (pad));
|
|
if (gst_pad_renegotiate (pad) == GST_PAD_LINK_REFUSED)
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
gst_element_clear_pad_caps (GstElement * element)
|
|
{
|
|
GList *pads = GST_ELEMENT_PADS (element);
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, element, "clearing pad caps");
|
|
|
|
while (pads) {
|
|
GstPad *pad = GST_PAD (pads->data);
|
|
|
|
gst_pad_unnegotiate (pad);
|
|
if (GST_IS_REAL_PAD (pad)) {
|
|
gst_caps_replace (&GST_RPAD_EXPLICIT_CAPS (pad), NULL);
|
|
}
|
|
|
|
pads = g_list_next (pads);
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_element_pads_activate (GstElement * element, gboolean active)
|
|
{
|
|
GList *pads = element->pads;
|
|
|
|
while (pads) {
|
|
GstPad *pad = GST_PAD (pads->data);
|
|
|
|
pads = g_list_next (pads);
|
|
|
|
if (!GST_IS_REAL_PAD (pad))
|
|
continue;
|
|
|
|
gst_pad_set_active (pad, active);
|
|
}
|
|
}
|
|
|
|
static GstElementStateReturn
|
|
gst_element_change_state (GstElement * element)
|
|
{
|
|
GstElementState old_state, old_pending;
|
|
GstObject *parent;
|
|
gint old_transition;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), GST_STATE_FAILURE);
|
|
|
|
old_state = GST_STATE (element);
|
|
old_pending = GST_STATE_PENDING (element);
|
|
old_transition = GST_STATE_TRANSITION (element);
|
|
|
|
/* if the element already is in the given state, we just return success */
|
|
if (old_pending == GST_STATE_VOID_PENDING ||
|
|
old_state == GST_STATE_PENDING (element)) {
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"element is already in the %s state",
|
|
gst_element_state_get_name (old_state));
|
|
return GST_STATE_SUCCESS;
|
|
}
|
|
|
|
/* we need to ref the object because of reentrancy issues with the signal
|
|
* handlers (including those in pads and gst_bin_child_state_change */
|
|
gst_object_ref (GST_OBJECT (element));
|
|
GST_CAT_LOG_OBJECT (GST_CAT_STATES, element,
|
|
"default handler tries setting state from %s to %s (%04x)",
|
|
gst_element_state_get_name (old_state),
|
|
gst_element_state_get_name (old_pending), old_transition);
|
|
|
|
/* we set the state change early for the negotiation functions */
|
|
GST_STATE (element) = old_pending;
|
|
GST_STATE_PENDING (element) = GST_STATE_VOID_PENDING;
|
|
|
|
switch (old_transition) {
|
|
case GST_STATE_PLAYING_TO_PAUSED:
|
|
if (element->clock) {
|
|
GstClockTimeDiff time = GST_CLOCK_TIME_NONE; //gst_clock_get_event_time (element->clock);
|
|
|
|
g_assert (time >= element->base_time);
|
|
element->base_time = time - element->base_time;
|
|
GST_CAT_LOG_OBJECT (GST_CAT_CLOCK, element, "setting base time to %"
|
|
G_GINT64_FORMAT, element->base_time);
|
|
}
|
|
gst_element_pads_activate (element, FALSE);
|
|
break;
|
|
case GST_STATE_PAUSED_TO_PLAYING:
|
|
gst_element_pads_activate (element, TRUE);
|
|
if (element->clock) {
|
|
GstClockTime time = GST_CLOCK_TIME_NONE; //gst_clock_get_event_time (element->clock);
|
|
|
|
element->base_time = time - element->base_time;
|
|
GST_CAT_LOG_OBJECT (GST_CAT_CLOCK, element, "setting base time to %"
|
|
GST_TIME_FORMAT, GST_TIME_ARGS (element->base_time));
|
|
}
|
|
break;
|
|
/* if we are going to paused, we try to negotiate the pads */
|
|
case GST_STATE_READY_TO_PAUSED:
|
|
g_assert (element->base_time == 0);
|
|
if (!gst_element_negotiate_pads (element)) {
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
|
|
"failed state change, could not negotiate pads");
|
|
goto failure;
|
|
}
|
|
break;
|
|
/* going to the READY state clears all pad caps */
|
|
/* FIXME: Why doesn't this happen on READY => NULL? -- Company */
|
|
case GST_STATE_PAUSED_TO_READY:
|
|
element->base_time = 0;
|
|
gst_element_clear_pad_caps (element);
|
|
break;
|
|
case GST_STATE_NULL_TO_READY:
|
|
case GST_STATE_READY_TO_NULL:
|
|
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 (old_state),
|
|
gst_element_state_get_name (old_pending));
|
|
break;
|
|
}
|
|
|
|
parent = GST_ELEMENT_PARENT (element);
|
|
|
|
GST_CAT_LOG_OBJECT (GST_CAT_STATES, element,
|
|
"signaling state change from %s to %s",
|
|
gst_element_state_get_name (old_state),
|
|
gst_element_state_get_name (GST_STATE (element)));
|
|
|
|
/* tell the scheduler if we have one */
|
|
if (element->sched) {
|
|
if (gst_scheduler_state_transition (element->sched, element,
|
|
old_transition) != GST_STATE_SUCCESS) {
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
|
|
"scheduler could not change state");
|
|
goto failure;
|
|
}
|
|
}
|
|
|
|
/* tell our parent about the state change */
|
|
if (parent && GST_IS_BIN (parent)) {
|
|
gst_bin_child_state_change (GST_BIN (parent), old_state,
|
|
GST_STATE (element), element);
|
|
}
|
|
/* at this point the state of the element could have changed again */
|
|
|
|
g_signal_emit (G_OBJECT (element), gst_element_signals[STATE_CHANGE],
|
|
0, old_state, GST_STATE (element));
|
|
|
|
/* signal the state change in case somebody is waiting for us */
|
|
g_cond_signal (element->state_cond);
|
|
|
|
gst_object_unref (GST_OBJECT (element));
|
|
return GST_STATE_SUCCESS;
|
|
|
|
failure:
|
|
/* undo the state change */
|
|
GST_STATE (element) = old_state;
|
|
GST_STATE_PENDING (element) = old_pending;
|
|
gst_object_unref (GST_OBJECT (element));
|
|
|
|
return GST_STATE_FAILURE;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_factory:
|
|
* @element: a #GstElement to request the element factory of.
|
|
*
|
|
* Retrieves the factory that was used to create this element.
|
|
*
|
|
* Returns: the #GstElementFactory used for creating this element.
|
|
*/
|
|
GstElementFactory *
|
|
gst_element_get_factory (GstElement * element)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
return GST_ELEMENT_GET_CLASS (element)->elementfactory;
|
|
}
|
|
|
|
static void
|
|
gst_element_dispose (GObject * object)
|
|
{
|
|
GstElement *element = GST_ELEMENT (object);
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_REFCOUNTING, element, "dispose");
|
|
|
|
gst_element_set_state (element, GST_STATE_NULL);
|
|
|
|
/* first we break all our links with the ouside */
|
|
while (element->pads) {
|
|
gst_element_remove_pad (element, GST_PAD (element->pads->data));
|
|
}
|
|
|
|
element->numsrcpads = 0;
|
|
element->numsinkpads = 0;
|
|
element->numpads = 0;
|
|
if (element->state_mutex)
|
|
g_mutex_free (element->state_mutex);
|
|
element->state_mutex = NULL;
|
|
if (element->state_cond)
|
|
g_cond_free (element->state_cond);
|
|
element->state_cond = NULL;
|
|
|
|
if (element->prop_value_queue)
|
|
g_async_queue_unref (element->prop_value_queue);
|
|
element->prop_value_queue = NULL;
|
|
if (element->property_mutex)
|
|
g_mutex_free (element->property_mutex);
|
|
element->property_mutex = NULL;
|
|
|
|
gst_object_replace ((GstObject **) & element->sched, NULL);
|
|
gst_object_replace ((GstObject **) & element->clock, NULL);
|
|
|
|
G_OBJECT_CLASS (parent_class)->dispose (object);
|
|
}
|
|
|
|
static void
|
|
gst_element_finalize (GObject * object)
|
|
{
|
|
//GstElement *element = GST_ELEMENT (object);
|
|
|
|
G_OBJECT_CLASS (parent_class)->finalize (object);
|
|
}
|
|
|
|
#ifndef GST_DISABLE_LOADSAVE
|
|
/**
|
|
* gst_element_save_thyself:
|
|
* @element: a #GstElement to save.
|
|
* @parent: the xml parent node.
|
|
*
|
|
* Saves the element as part of the given XML structure.
|
|
*
|
|
* Returns: the new #xmlNodePtr.
|
|
*/
|
|
static xmlNodePtr
|
|
gst_element_save_thyself (GstObject * object, xmlNodePtr parent)
|
|
{
|
|
GList *pads;
|
|
GstElementClass *oclass;
|
|
GParamSpec **specs, *spec;
|
|
gint nspecs, i;
|
|
GValue value = { 0, };
|
|
GstElement *element;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (object), parent);
|
|
|
|
element = GST_ELEMENT (object);
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
xmlNewChild (parent, NULL, "name", GST_ELEMENT_NAME (element));
|
|
|
|
if (oclass->elementfactory != NULL) {
|
|
GstElementFactory *factory = (GstElementFactory *) oclass->elementfactory;
|
|
|
|
xmlNewChild (parent, NULL, "type", GST_PLUGIN_FEATURE (factory)->name);
|
|
}
|
|
|
|
/* FIXME: what is this? */
|
|
/* if (element->manager) */
|
|
/* xmlNewChild(parent, NULL, "manager", GST_ELEMENT_NAME(element->manager)); */
|
|
|
|
/* params */
|
|
specs = g_object_class_list_properties (G_OBJECT_GET_CLASS (object), &nspecs);
|
|
|
|
for (i = 0; i < nspecs; i++) {
|
|
spec = specs[i];
|
|
if (spec->flags & G_PARAM_READABLE) {
|
|
xmlNodePtr param;
|
|
char *contents;
|
|
|
|
g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (spec));
|
|
|
|
g_object_get_property (G_OBJECT (element), spec->name, &value);
|
|
param = xmlNewChild (parent, NULL, "param", NULL);
|
|
xmlNewChild (param, NULL, "name", spec->name);
|
|
|
|
if (G_IS_PARAM_SPEC_STRING (spec))
|
|
contents = g_value_dup_string (&value);
|
|
else if (G_IS_PARAM_SPEC_ENUM (spec))
|
|
contents = g_strdup_printf ("%d", g_value_get_enum (&value));
|
|
else if (G_IS_PARAM_SPEC_INT64 (spec))
|
|
contents = g_strdup_printf ("%" G_GINT64_FORMAT,
|
|
g_value_get_int64 (&value));
|
|
else
|
|
contents = g_strdup_value_contents (&value);
|
|
|
|
xmlNewChild (param, NULL, "value", contents);
|
|
g_free (contents);
|
|
|
|
g_value_unset (&value);
|
|
}
|
|
}
|
|
|
|
pads = GST_ELEMENT_PADS (element);
|
|
|
|
while (pads) {
|
|
GstPad *pad = GST_PAD (pads->data);
|
|
|
|
/* figure out if it's a direct pad or a ghostpad */
|
|
if (GST_ELEMENT (GST_OBJECT_PARENT (pad)) == element) {
|
|
xmlNodePtr padtag = xmlNewChild (parent, NULL, "pad", NULL);
|
|
|
|
gst_object_save_thyself (GST_OBJECT (pad), padtag);
|
|
}
|
|
pads = g_list_next (pads);
|
|
}
|
|
|
|
return parent;
|
|
}
|
|
|
|
static void
|
|
gst_element_restore_thyself (GstObject * object, xmlNodePtr self)
|
|
{
|
|
xmlNodePtr children;
|
|
GstElement *element;
|
|
gchar *name = NULL;
|
|
gchar *value = NULL;
|
|
|
|
element = GST_ELEMENT (object);
|
|
g_return_if_fail (element != NULL);
|
|
|
|
/* parameters */
|
|
children = self->xmlChildrenNode;
|
|
while (children) {
|
|
if (!strcmp (children->name, "param")) {
|
|
xmlNodePtr child = children->xmlChildrenNode;
|
|
|
|
while (child) {
|
|
if (!strcmp (child->name, "name")) {
|
|
name = xmlNodeGetContent (child);
|
|
} else if (!strcmp (child->name, "value")) {
|
|
value = xmlNodeGetContent (child);
|
|
}
|
|
child = child->next;
|
|
}
|
|
/* FIXME: can this just be g_object_set ? */
|
|
gst_util_set_object_arg (G_OBJECT (element), name, value);
|
|
/* g_object_set (G_OBJECT (element), name, value, NULL); */
|
|
g_free (name);
|
|
g_free (value);
|
|
}
|
|
children = children->next;
|
|
}
|
|
|
|
/* pads */
|
|
children = self->xmlChildrenNode;
|
|
while (children) {
|
|
if (!strcmp (children->name, "pad")) {
|
|
gst_pad_load_and_link (children, GST_OBJECT (element));
|
|
}
|
|
children = children->next;
|
|
}
|
|
|
|
if (GST_OBJECT_CLASS (parent_class)->restore_thyself)
|
|
(GST_OBJECT_CLASS (parent_class)->restore_thyself) (object, self);
|
|
}
|
|
#endif /* GST_DISABLE_LOADSAVE */
|
|
|
|
/**
|
|
* gst_element_yield:
|
|
* @element: a #GstElement to yield.
|
|
*
|
|
* Requests a yield operation for the element. The scheduler will typically
|
|
* give control to another element.
|
|
*/
|
|
void
|
|
gst_element_yield (GstElement * element)
|
|
{
|
|
if (GST_ELEMENT_SCHEDULER (element)) {
|
|
gst_scheduler_yield (GST_ELEMENT_SCHEDULER (element), element);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_interrupt:
|
|
* @element: a #GstElement to interrupt.
|
|
*
|
|
* Requests the scheduler of this element to interrupt the execution of
|
|
* this element and scheduler another one.
|
|
*
|
|
* Returns: TRUE if the element should exit its chain/loop/get
|
|
* function ASAP, depending on the scheduler implementation.
|
|
*/
|
|
gboolean
|
|
gst_element_interrupt (GstElement * element)
|
|
{
|
|
if (GST_ELEMENT_SCHEDULER (element)) {
|
|
return gst_scheduler_interrupt (GST_ELEMENT_SCHEDULER (element), element);
|
|
} else
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_scheduler:
|
|
* @element: a #GstElement to set the scheduler of.
|
|
* @scheduler: the #GstScheduler to set.
|
|
*
|
|
* Sets the scheduler of the element. For internal use only, unless you're
|
|
* testing elements.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
void
|
|
gst_element_set_scheduler (GstElement * element, GstScheduler * scheduler)
|
|
{
|
|
GstElementClass *oclass;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->set_scheduler)
|
|
oclass->set_scheduler (element, scheduler);
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_scheduler:
|
|
* @element: a #GstElement to get the scheduler of.
|
|
*
|
|
* Returns the scheduler of the element.
|
|
*
|
|
* Returns: the element's #GstScheduler.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstScheduler *
|
|
gst_element_get_scheduler (GstElement * element)
|
|
{
|
|
GstScheduler *result = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), result);
|
|
|
|
GST_LOCK (element);
|
|
result = GST_ELEMENT_SCHEDULER (element);
|
|
GST_UNLOCK (element);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_loop_function:
|
|
* @element: a #GstElement to set the loop function of.
|
|
* @loop: Pointer to #GstElementLoopFunction.
|
|
*
|
|
* This sets the loop function for the element. The function pointed to
|
|
* can deviate from the GstElementLoopFunction definition in type of
|
|
* pointer only.
|
|
*
|
|
* NOTE: in order for this to take effect, the current loop function *must*
|
|
* exit. Assuming the loop function itself is the only one who will cause
|
|
* a new loopfunc to be assigned, this should be no problem.
|
|
*/
|
|
void
|
|
gst_element_set_loop_function (GstElement * element,
|
|
GstElementLoopFunction loop)
|
|
{
|
|
gboolean need_notify = FALSE;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
/* if the element changed from loop based to chain/get based
|
|
* or vice versa, we need to inform the scheduler about that */
|
|
if ((element->loopfunc == NULL && loop != NULL) ||
|
|
(element->loopfunc != NULL && loop == NULL)) {
|
|
need_notify = TRUE;
|
|
}
|
|
|
|
/* set the loop function */
|
|
element->loopfunc = loop;
|
|
|
|
if (need_notify) {
|
|
/* set the NEW_LOOPFUNC flag so everyone knows to go try again */
|
|
GST_FLAG_SET (element, GST_ELEMENT_NEW_LOOPFUNC);
|
|
|
|
if (GST_ELEMENT_SCHEDULER (element)) {
|
|
gst_scheduler_scheduling_change (GST_ELEMENT_SCHEDULER (element),
|
|
element);
|
|
}
|
|
}
|
|
}
|
|
static inline void
|
|
gst_element_emit_found_tag (GstElement * element, GstElement * source,
|
|
const GstTagList * tag_list)
|
|
{
|
|
gst_object_ref (GST_OBJECT (element));
|
|
g_signal_emit (element, gst_element_signals[FOUND_TAG], 0, source, tag_list);
|
|
gst_object_unref (GST_OBJECT (element));
|
|
}
|
|
static void
|
|
gst_element_found_tag_func (GstElement * element, GstElement * source,
|
|
const GstTagList * tag_list)
|
|
{
|
|
/* tell the parent */
|
|
if (GST_OBJECT_PARENT (element)) {
|
|
GST_CAT_LOG_OBJECT (GST_CAT_EVENT, element, "forwarding tag event to %s",
|
|
GST_OBJECT_NAME (GST_OBJECT_PARENT (element)));
|
|
gst_element_emit_found_tag (GST_ELEMENT (GST_OBJECT_PARENT (element)),
|
|
source, tag_list);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_found_tags:
|
|
* @element: the element that found the tags
|
|
* @tag_list: the found tags
|
|
*
|
|
* This function emits the found_tags signal. This is a recursive signal, so
|
|
* every parent will emit that signal, too, before this function returns.
|
|
* Only emit this signal, when you extracted these tags out of the data stream,
|
|
* not when you handle an event.
|
|
*/
|
|
void
|
|
gst_element_found_tags (GstElement * element, const GstTagList * tag_list)
|
|
{
|
|
gst_element_emit_found_tag (element, element, tag_list);
|
|
}
|
|
|
|
/**
|
|
* gst_element_found_tags_for_pad:
|
|
* @element: element that found the tag
|
|
* @pad: src pad the tags correspond to
|
|
* @timestamp: time the tags were found
|
|
* @list: the taglist
|
|
*
|
|
* This is a convenience routine for tag finding. Most of the time you only
|
|
* want to push the found tags down one pad, in that case this function is for
|
|
* you. It takes ownership of the taglist, emits the found-tag signal and
|
|
* pushes a tag event down the pad.
|
|
* <note>This function may not be used in a #GstPadGetFunction, because it calls
|
|
* gst_pad_push(). In those functions, call gst_element_found_tags(), create a
|
|
* tag event with gst_event_new_tag() and return that from your
|
|
* #GstPadGetFunction.</note>
|
|
*/
|
|
void
|
|
gst_element_found_tags_for_pad (GstElement * element, GstPad * pad,
|
|
GstClockTime timestamp, GstTagList * list)
|
|
{
|
|
GstEvent *tag_event;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
g_return_if_fail (GST_IS_REAL_PAD (pad));
|
|
g_return_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SRC);
|
|
g_return_if_fail (element == GST_PAD_PARENT (pad));
|
|
g_return_if_fail (list != NULL);
|
|
|
|
tag_event = gst_event_new_tag (list);
|
|
GST_EVENT_TIMESTAMP (tag_event) = timestamp;
|
|
gst_element_found_tags (element, gst_event_tag_get_list (tag_event));
|
|
if (GST_PAD_IS_USABLE (pad)) {
|
|
gst_pad_push (pad, GST_DATA (tag_event));
|
|
} else {
|
|
gst_data_unref (GST_DATA (tag_event));
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
gst_element_set_eos_recursive (GstElement * element)
|
|
{
|
|
/* this function is only called, when we were in PLAYING before. So every
|
|
parent that's PAUSED was PLAYING before. That means it has reached EOS. */
|
|
GstElement *parent;
|
|
|
|
GST_CAT_DEBUG (GST_CAT_EVENT, "setting recursive EOS on %s",
|
|
GST_OBJECT_NAME (element));
|
|
g_signal_emit (G_OBJECT (element), gst_element_signals[EOS], 0);
|
|
|
|
if (!GST_OBJECT_PARENT (element))
|
|
return;
|
|
|
|
parent = GST_ELEMENT (GST_OBJECT_PARENT (element));
|
|
if (GST_STATE (parent) == GST_STATE_PAUSED)
|
|
gst_element_set_eos_recursive (parent);
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_eos:
|
|
* @element: a #GstElement to set to the EOS state.
|
|
*
|
|
* Perform the actions needed to bring the element in the EOS state.
|
|
*/
|
|
void
|
|
gst_element_set_eos (GstElement * element)
|
|
{
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
GST_CAT_DEBUG (GST_CAT_EVENT, "setting EOS on element %s",
|
|
GST_OBJECT_NAME (element));
|
|
|
|
if (GST_STATE (element) == GST_STATE_PLAYING) {
|
|
gst_element_set_state (element, GST_STATE_PAUSED);
|
|
gst_element_set_eos_recursive (element);
|
|
} else {
|
|
g_signal_emit (G_OBJECT (element), gst_element_signals[EOS], 0);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_managing_bin:
|
|
* @element: a #GstElement to get the managing bin of.
|
|
*
|
|
* Gets the managing bin (a pipeline or a thread, for example) of an element.
|
|
*
|
|
* Returns: the #GstBin, or NULL on failure.
|
|
**/
|
|
GstBin *
|
|
gst_element_get_managing_bin (GstElement * element)
|
|
{
|
|
GstBin *bin;
|
|
|
|
g_return_val_if_fail (element != NULL, NULL);
|
|
|
|
bin = GST_BIN (gst_object_get_parent (GST_OBJECT (element)));
|
|
|
|
while (bin && !GST_FLAG_IS_SET (GST_OBJECT (bin), GST_BIN_FLAG_MANAGER))
|
|
bin = GST_BIN (gst_object_get_parent (GST_OBJECT (bin)));
|
|
|
|
return bin;
|
|
}
|