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646 lines
18 KiB
C
646 lines
18 KiB
C
/* GStreamer
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* Copyright (C) 2005 David Schleef <ds@schleef.org>
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*
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* gstminiobject.h: Header for GstMiniObject
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:gstminiobject
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* @short_description: Lightweight base class for the GStreamer object hierarchy
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*
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* #GstMiniObject is a baseclass like #GObject, but has been stripped down of
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* features to be fast and small.
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* It offers sub-classing and ref-counting in the same way as #GObject does.
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* It has no properties and no signal-support though.
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*
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* Last reviewed on 2005-11-23 (0.9.5)
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gst/gst_private.h"
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#include "gst/gstminiobject.h"
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#include "gst/gstinfo.h"
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#include <gobject/gvaluecollector.h>
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#ifndef GST_DISABLE_TRACE
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#include "gsttrace.h"
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static GstAllocTrace *_gst_mini_object_trace;
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#endif
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#define DEBUG_REFCOUNT
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#if 0
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static void gst_mini_object_base_init (gpointer g_class);
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static void gst_mini_object_base_finalize (gpointer g_class);
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#endif
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static void gst_mini_object_class_init (gpointer g_class, gpointer class_data);
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static void gst_mini_object_init (GTypeInstance * instance, gpointer klass);
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static void gst_value_mini_object_init (GValue * value);
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static void gst_value_mini_object_free (GValue * value);
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static void gst_value_mini_object_copy (const GValue * src_value,
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GValue * dest_value);
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static gpointer gst_value_mini_object_peek_pointer (const GValue * value);
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static gchar *gst_value_mini_object_collect (GValue * value,
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guint n_collect_values, GTypeCValue * collect_values, guint collect_flags);
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static gchar *gst_value_mini_object_lcopy (const GValue * value,
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guint n_collect_values, GTypeCValue * collect_values, guint collect_flags);
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static GstMiniObject *gst_mini_object_copy_default (const GstMiniObject * obj);
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static void gst_mini_object_finalize (GstMiniObject * obj);
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GType
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gst_mini_object_get_type (void)
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{
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static GType _gst_mini_object_type = 0;
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if (G_UNLIKELY (_gst_mini_object_type == 0)) {
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GTypeValueTable value_table = {
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gst_value_mini_object_init,
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gst_value_mini_object_free,
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gst_value_mini_object_copy,
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gst_value_mini_object_peek_pointer,
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"p",
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gst_value_mini_object_collect,
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"p",
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gst_value_mini_object_lcopy
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};
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GTypeInfo mini_object_info = {
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sizeof (GstMiniObjectClass),
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#if 0
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gst_mini_object_base_init,
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gst_mini_object_base_finalize,
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#else
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NULL, NULL,
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#endif
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gst_mini_object_class_init,
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NULL,
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NULL,
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sizeof (GstMiniObject),
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0,
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(GInstanceInitFunc) gst_mini_object_init,
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NULL
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};
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static const GTypeFundamentalInfo mini_object_fundamental_info = {
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(G_TYPE_FLAG_CLASSED | G_TYPE_FLAG_INSTANTIATABLE |
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G_TYPE_FLAG_DERIVABLE | G_TYPE_FLAG_DEEP_DERIVABLE)
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};
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mini_object_info.value_table = &value_table;
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_gst_mini_object_type = g_type_fundamental_next ();
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g_type_register_fundamental (_gst_mini_object_type, "GstMiniObject",
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&mini_object_info, &mini_object_fundamental_info, G_TYPE_FLAG_ABSTRACT);
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#ifndef GST_DISABLE_TRACE
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_gst_mini_object_trace =
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gst_alloc_trace_register (g_type_name (_gst_mini_object_type));
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#endif
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}
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return _gst_mini_object_type;
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}
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#if 0
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static void
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gst_mini_object_base_init (gpointer g_class)
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{
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/* do nothing */
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}
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static void
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gst_mini_object_base_finalize (gpointer g_class)
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{
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/* do nothing */
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}
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#endif
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static void
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gst_mini_object_class_init (gpointer g_class, gpointer class_data)
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{
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GstMiniObjectClass *mo_class = GST_MINI_OBJECT_CLASS (g_class);
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mo_class->copy = gst_mini_object_copy_default;
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mo_class->finalize = gst_mini_object_finalize;
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}
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static void
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gst_mini_object_init (GTypeInstance * instance, gpointer klass)
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{
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GstMiniObject *mini_object = GST_MINI_OBJECT_CAST (instance);
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mini_object->refcount = 1;
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}
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static GstMiniObject *
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gst_mini_object_copy_default (const GstMiniObject * obj)
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{
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g_warning ("GstMiniObject classes must implement GstMiniObject::copy");
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return NULL;
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}
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static void
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gst_mini_object_finalize (GstMiniObject * obj)
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{
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/* do nothing */
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/* WARNING: if anything is ever put in this method, make sure that the
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* following sub-classes' finalize method chains up to this one:
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* gstbuffer
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* gstevent
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* gstmessage
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* gstquery
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*/
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}
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/**
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* gst_mini_object_new:
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* @type: the #GType of the mini-object to create
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*
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* Creates a new mini-object of the desired type.
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*
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* MT safe
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*
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* Returns: the new mini-object.
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*/
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GstMiniObject *
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gst_mini_object_new (GType type)
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{
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GstMiniObject *mini_object;
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/* we don't support dynamic types because they really aren't useful,
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* and could cause refcount problems */
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mini_object = (GstMiniObject *) g_type_create_instance (type);
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#ifndef GST_DISABLE_TRACE
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gst_alloc_trace_new (_gst_mini_object_trace, mini_object);
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#endif
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return mini_object;
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}
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/* FIXME 0.11: Current way of doing the copy makes it impossible
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* to currectly chain to the parent classes and do a copy in a
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* subclass without knowing all internals of the parent classes.
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*
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* For 0.11 we should do something like the following:
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* - The GstMiniObjectClass::copy() implementation of GstMiniObject
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* should call g_type_create_instance() with the type of the source
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* object.
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* - All GstMiniObjectClass::copy() implementations should as first
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* thing chain up to the parent class and then do whatever they need
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* to do to copy their type specific data. Note that this way the
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* instance_init() functions are called!
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*/
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/**
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* gst_mini_object_copy:
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* @mini_object: the mini-object to copy
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*
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* Creates a copy of the mini-object.
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*
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* MT safe
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*
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* Returns: the new mini-object.
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*/
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GstMiniObject *
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gst_mini_object_copy (const GstMiniObject * mini_object)
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{
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GstMiniObjectClass *mo_class;
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g_return_val_if_fail (mini_object != NULL, NULL);
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mo_class = GST_MINI_OBJECT_GET_CLASS (mini_object);
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return mo_class->copy (mini_object);
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}
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/**
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* gst_mini_object_is_writable:
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* @mini_object: the mini-object to check
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*
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* Checks if a mini-object is writable. A mini-object is writable
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* if the reference count is one and the #GST_MINI_OBJECT_FLAG_READONLY
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* flag is not set. Modification of a mini-object should only be
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* done after verifying that it is writable.
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*
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* MT safe
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*
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* Returns: TRUE if the object is writable.
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*/
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gboolean
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gst_mini_object_is_writable (const GstMiniObject * mini_object)
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{
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g_return_val_if_fail (mini_object != NULL, FALSE);
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return (GST_MINI_OBJECT_REFCOUNT_VALUE (mini_object) == 1) &&
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((mini_object->flags & GST_MINI_OBJECT_FLAG_READONLY) == 0);
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}
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/**
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* gst_mini_object_make_writable:
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* @mini_object: the mini-object to make writable
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*
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* Checks if a mini-object is writable. If not, a writable copy is made and
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* returned. This gives away the reference to the original mini object,
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* and returns a reference to the new object.
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*
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* MT safe
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*
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* Returns: a mini-object (possibly the same pointer) that is writable.
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*/
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GstMiniObject *
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gst_mini_object_make_writable (GstMiniObject * mini_object)
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{
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GstMiniObject *ret;
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g_return_val_if_fail (mini_object != NULL, NULL);
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if (gst_mini_object_is_writable (mini_object)) {
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ret = (GstMiniObject *) mini_object;
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} else {
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GST_CAT_DEBUG (GST_CAT_PERFORMANCE, "copy %s miniobject",
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g_type_name (G_TYPE_FROM_INSTANCE (mini_object)));
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ret = gst_mini_object_copy (mini_object);
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gst_mini_object_unref ((GstMiniObject *) mini_object);
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}
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return ret;
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}
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/**
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* gst_mini_object_ref:
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* @mini_object: the mini-object
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*
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* Increase the reference count of the mini-object.
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*
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* Note that the refcount affects the writeability
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* of @mini-object, see gst_mini_object_is_writable(). It is
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* important to note that keeping additional references to
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* GstMiniObject instances can potentially increase the number
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* of memcpy operations in a pipeline, especially if the miniobject
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* is a #GstBuffer.
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*
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* Returns: the mini-object.
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*/
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GstMiniObject *
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gst_mini_object_ref (GstMiniObject * mini_object)
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{
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g_return_val_if_fail (mini_object != NULL, NULL);
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/* we cannot assert that the refcount > 0 since a bufferalloc
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* function might resurrect an object
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g_return_val_if_fail (mini_object->refcount > 0, NULL);
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*/
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#ifdef DEBUG_REFCOUNT
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g_return_val_if_fail (GST_IS_MINI_OBJECT (mini_object), NULL);
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GST_CAT_LOG (GST_CAT_REFCOUNTING, "%p ref %d->%d",
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mini_object,
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GST_MINI_OBJECT_REFCOUNT_VALUE (mini_object),
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GST_MINI_OBJECT_REFCOUNT_VALUE (mini_object) + 1);
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#endif
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g_atomic_int_inc (&mini_object->refcount);
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return mini_object;
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}
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static void
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gst_mini_object_free (GstMiniObject * mini_object)
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{
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GstMiniObjectClass *mo_class;
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mo_class = GST_MINI_OBJECT_GET_CLASS (mini_object);
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mo_class->finalize (mini_object);
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/* if the refcount is still 0 we can really free the
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* object, else the finalize method recycled the object */
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if (g_atomic_int_get (&mini_object->refcount) == 0) {
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#ifndef GST_DISABLE_TRACE
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gst_alloc_trace_free (_gst_mini_object_trace, mini_object);
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#endif
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g_type_free_instance ((GTypeInstance *) mini_object);
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}
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}
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/**
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* gst_mini_object_unref:
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* @mini_object: the mini-object
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*
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* Decreases the reference count of the mini-object, possibly freeing
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* the mini-object.
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*/
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void
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gst_mini_object_unref (GstMiniObject * mini_object)
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{
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g_return_if_fail (mini_object != NULL);
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g_return_if_fail (mini_object->refcount > 0);
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#ifdef DEBUG_REFCOUNT
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g_return_if_fail (GST_IS_MINI_OBJECT (mini_object));
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GST_CAT_LOG (GST_CAT_REFCOUNTING, "%p unref %d->%d",
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mini_object,
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GST_MINI_OBJECT_REFCOUNT_VALUE (mini_object),
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GST_MINI_OBJECT_REFCOUNT_VALUE (mini_object) - 1);
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#endif
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if (G_UNLIKELY (g_atomic_int_dec_and_test (&mini_object->refcount))) {
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gst_mini_object_free (mini_object);
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}
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}
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/**
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* gst_mini_object_replace:
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* @olddata: pointer to a pointer to a mini-object to be replaced
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* @newdata: pointer to new mini-object
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*
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* Modifies a pointer to point to a new mini-object. The modification
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* is done atomically, and the reference counts are updated correctly.
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* Either @newdata and the value pointed to by @olddata may be NULL.
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*/
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void
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gst_mini_object_replace (GstMiniObject ** olddata, GstMiniObject * newdata)
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{
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GstMiniObject *olddata_val;
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g_return_if_fail (olddata != NULL);
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#ifdef DEBUG_REFCOUNT
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GST_CAT_LOG (GST_CAT_REFCOUNTING, "replace %p (%d) with %p (%d)",
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*olddata, *olddata ? (*olddata)->refcount : 0,
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newdata, newdata ? newdata->refcount : 0);
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#endif
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olddata_val = g_atomic_pointer_get ((gpointer *) olddata);
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if (olddata_val == newdata)
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return;
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if (newdata)
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gst_mini_object_ref (newdata);
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while (!g_atomic_pointer_compare_and_exchange ((gpointer *) olddata,
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olddata_val, newdata)) {
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olddata_val = g_atomic_pointer_get ((gpointer *) olddata);
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}
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if (olddata_val)
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gst_mini_object_unref (olddata_val);
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}
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static void
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gst_value_mini_object_init (GValue * value)
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{
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value->data[0].v_pointer = NULL;
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}
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static void
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gst_value_mini_object_free (GValue * value)
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{
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if (value->data[0].v_pointer) {
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gst_mini_object_unref (GST_MINI_OBJECT_CAST (value->data[0].v_pointer));
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}
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}
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static void
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gst_value_mini_object_copy (const GValue * src_value, GValue * dest_value)
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{
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if (src_value->data[0].v_pointer) {
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dest_value->data[0].v_pointer =
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gst_mini_object_ref (GST_MINI_OBJECT_CAST (src_value->
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data[0].v_pointer));
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} else {
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dest_value->data[0].v_pointer = NULL;
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}
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}
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static gpointer
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gst_value_mini_object_peek_pointer (const GValue * value)
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{
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return value->data[0].v_pointer;
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}
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static gchar *
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gst_value_mini_object_collect (GValue * value, guint n_collect_values,
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GTypeCValue * collect_values, guint collect_flags)
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{
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gst_value_set_mini_object (value, collect_values[0].v_pointer);
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return NULL;
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}
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static gchar *
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gst_value_mini_object_lcopy (const GValue * value, guint n_collect_values,
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GTypeCValue * collect_values, guint collect_flags)
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{
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gpointer *mini_object_p = collect_values[0].v_pointer;
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if (!mini_object_p) {
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return g_strdup_printf ("value location for '%s' passed as NULL",
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G_VALUE_TYPE_NAME (value));
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}
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if (!value->data[0].v_pointer)
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*mini_object_p = NULL;
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else if (collect_flags & G_VALUE_NOCOPY_CONTENTS)
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*mini_object_p = value->data[0].v_pointer;
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else
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*mini_object_p = gst_mini_object_ref (value->data[0].v_pointer);
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return NULL;
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}
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/**
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* gst_value_set_mini_object:
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* @value: a valid #GValue of %GST_TYPE_MINI_OBJECT derived type
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* @mini_object: mini object value to set
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*
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* Set the contents of a %GST_TYPE_MINI_OBJECT derived #GValue to
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* @mini_object.
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* The caller retains ownership of the reference.
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*/
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void
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gst_value_set_mini_object (GValue * value, GstMiniObject * mini_object)
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{
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gpointer *pointer_p;
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g_return_if_fail (GST_VALUE_HOLDS_MINI_OBJECT (value));
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g_return_if_fail (mini_object == NULL || GST_IS_MINI_OBJECT (mini_object));
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pointer_p = &value->data[0].v_pointer;
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gst_mini_object_replace ((GstMiniObject **) pointer_p, mini_object);
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}
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/**
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* gst_value_take_mini_object:
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* @value: a valid #GValue of %GST_TYPE_MINI_OBJECT derived type
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* @mini_object: mini object value to take
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*
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* Set the contents of a %GST_TYPE_MINI_OBJECT derived #GValue to
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* @mini_object.
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* Takes over the ownership of the caller's reference to @mini_object;
|
|
* the caller doesn't have to unref it any more.
|
|
*/
|
|
void
|
|
gst_value_take_mini_object (GValue * value, GstMiniObject * mini_object)
|
|
{
|
|
gpointer *pointer_p;
|
|
|
|
g_return_if_fail (GST_VALUE_HOLDS_MINI_OBJECT (value));
|
|
g_return_if_fail (mini_object == NULL || GST_IS_MINI_OBJECT (mini_object));
|
|
|
|
pointer_p = &value->data[0].v_pointer;
|
|
/* takes additional refcount */
|
|
gst_mini_object_replace ((GstMiniObject **) pointer_p, mini_object);
|
|
/* remove additional refcount */
|
|
if (mini_object)
|
|
gst_mini_object_unref (mini_object);
|
|
}
|
|
|
|
/**
|
|
* gst_value_get_mini_object:
|
|
* @value: a valid #GValue of %GST_TYPE_MINI_OBJECT derived type
|
|
*
|
|
* Get the contents of a %GST_TYPE_MINI_OBJECT derived #GValue.
|
|
* Does not increase the refcount of the returned object.
|
|
*
|
|
* Returns: mini object contents of @value
|
|
*/
|
|
GstMiniObject *
|
|
gst_value_get_mini_object (const GValue * value)
|
|
{
|
|
g_return_val_if_fail (GST_VALUE_HOLDS_MINI_OBJECT (value), NULL);
|
|
|
|
return value->data[0].v_pointer;
|
|
}
|
|
|
|
/**
|
|
* gst_value_dup_mini_object:
|
|
* @value: a valid #GValue of %GST_TYPE_MINI_OBJECT derived type
|
|
*
|
|
* Get the contents of a %GST_TYPE_MINI_OBJECT derived #GValue,
|
|
* increasing its reference count.
|
|
*
|
|
* Returns: mini object contents of @value
|
|
*
|
|
* Since: 0.10.20
|
|
*/
|
|
GstMiniObject *
|
|
gst_value_dup_mini_object (const GValue * value)
|
|
{
|
|
g_return_val_if_fail (GST_VALUE_HOLDS_MINI_OBJECT (value), NULL);
|
|
|
|
return gst_mini_object_ref (value->data[0].v_pointer);
|
|
}
|
|
|
|
|
|
/* param spec */
|
|
|
|
static void
|
|
param_mini_object_init (GParamSpec * pspec)
|
|
{
|
|
/* GParamSpecMiniObject *ospec = G_PARAM_SPEC_MINI_OBJECT (pspec); */
|
|
}
|
|
|
|
static void
|
|
param_mini_object_set_default (GParamSpec * pspec, GValue * value)
|
|
{
|
|
value->data[0].v_pointer = NULL;
|
|
}
|
|
|
|
static gboolean
|
|
param_mini_object_validate (GParamSpec * pspec, GValue * value)
|
|
{
|
|
GstParamSpecMiniObject *ospec = GST_PARAM_SPEC_MINI_OBJECT (pspec);
|
|
GstMiniObject *mini_object = value->data[0].v_pointer;
|
|
gboolean changed = FALSE;
|
|
|
|
if (mini_object
|
|
&& !g_value_type_compatible (G_OBJECT_TYPE (mini_object),
|
|
G_PARAM_SPEC_VALUE_TYPE (ospec))) {
|
|
gst_mini_object_unref (mini_object);
|
|
value->data[0].v_pointer = NULL;
|
|
changed = TRUE;
|
|
}
|
|
|
|
return changed;
|
|
}
|
|
|
|
static gint
|
|
param_mini_object_values_cmp (GParamSpec * pspec,
|
|
const GValue * value1, const GValue * value2)
|
|
{
|
|
guint8 *p1 = value1->data[0].v_pointer;
|
|
guint8 *p2 = value2->data[0].v_pointer;
|
|
|
|
/* not much to compare here, try to at least provide stable lesser/greater result */
|
|
|
|
return p1 < p2 ? -1 : p1 > p2;
|
|
}
|
|
|
|
GType
|
|
gst_param_spec_mini_object_get_type (void)
|
|
{
|
|
static GType type;
|
|
|
|
if (G_UNLIKELY (type) == 0) {
|
|
static const GParamSpecTypeInfo pspec_info = {
|
|
sizeof (GstParamSpecMiniObject), /* instance_size */
|
|
16, /* n_preallocs */
|
|
param_mini_object_init, /* instance_init */
|
|
G_TYPE_OBJECT, /* value_type */
|
|
NULL, /* finalize */
|
|
param_mini_object_set_default, /* value_set_default */
|
|
param_mini_object_validate, /* value_validate */
|
|
param_mini_object_values_cmp, /* values_cmp */
|
|
};
|
|
/* FIXME 0.11: Should really be GstParamSpecMiniObject */
|
|
type = g_param_type_register_static ("GParamSpecMiniObject", &pspec_info);
|
|
}
|
|
|
|
return type;
|
|
}
|
|
|
|
/**
|
|
* gst_param_spec_mini_object:
|
|
* @name: the canonical name of the property
|
|
* @nick: the nickname of the property
|
|
* @blurb: a short description of the property
|
|
* @object_type: the #GstMiniObjectType for the property
|
|
* @flags: a combination of #GParamFlags
|
|
*
|
|
* Creates a new #GParamSpec instance that hold #GstMiniObject references.
|
|
*
|
|
* Returns: a newly allocated #GParamSpec instance
|
|
*/
|
|
GParamSpec *
|
|
gst_param_spec_mini_object (const char *name, const char *nick,
|
|
const char *blurb, GType object_type, GParamFlags flags)
|
|
{
|
|
GstParamSpecMiniObject *ospec;
|
|
|
|
g_return_val_if_fail (g_type_is_a (object_type, GST_TYPE_MINI_OBJECT), NULL);
|
|
|
|
ospec = g_param_spec_internal (GST_TYPE_PARAM_MINI_OBJECT,
|
|
name, nick, blurb, flags);
|
|
G_PARAM_SPEC (ospec)->value_type = object_type;
|
|
|
|
return G_PARAM_SPEC (ospec);
|
|
}
|