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587 lines
17 KiB
C
587 lines
17 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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* 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
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*
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* gstdeviceproviderfactory.c: GstDeviceProviderFactory object, support routines
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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:gstdeviceproviderfactory
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* @title: GstDeviceProviderFactory
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* @short_description: Create GstDeviceProviders from a factory
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* @see_also: #GstDeviceProvider, #GstPlugin, #GstPluginFeature, #GstPadTemplate.
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*
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* #GstDeviceProviderFactory is used to create instances of device providers. A
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* GstDeviceProviderfactory can be added to a #GstPlugin as it is also a
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* #GstPluginFeature.
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*
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* Use the gst_device_provider_factory_find() and
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* gst_device_provider_factory_get() functions to create device
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* provider instances or use gst_device_provider_factory_get_by_name() as a
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* convenient shortcut.
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*
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* Since: 1.4
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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_private.h"
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#include "gstdeviceproviderfactory.h"
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#include "gst.h"
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#include "glib-compat-private.h"
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GST_DEBUG_CATEGORY_STATIC (device_provider_factory_debug);
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#define GST_CAT_DEFAULT device_provider_factory_debug
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static void gst_device_provider_factory_finalize (GObject * object);
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static void gst_device_provider_factory_cleanup (GstDeviceProviderFactory *
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factory);
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/* static guint gst_device_provider_factory_signals[LAST_SIGNAL] = { 0 }; */
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/* this is defined in gstelement.c */
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extern GQuark __gst_deviceproviderclass_factory;
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#define _do_init \
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{ \
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GST_DEBUG_CATEGORY_INIT (device_provider_factory_debug, "GST_DEVICE_PROVIDER_FACTORY", \
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GST_DEBUG_BOLD | GST_DEBUG_FG_WHITE | GST_DEBUG_BG_RED, \
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"device provider factories keep information about installed device providers"); \
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}
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G_DEFINE_TYPE_WITH_CODE (GstDeviceProviderFactory, gst_device_provider_factory,
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GST_TYPE_PLUGIN_FEATURE, _do_init);
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static void
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gst_device_provider_factory_class_init (GstDeviceProviderFactoryClass * klass)
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{
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GObjectClass *gobject_class = (GObjectClass *) klass;
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gobject_class->finalize = gst_device_provider_factory_finalize;
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}
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static void
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gst_device_provider_factory_init (GstDeviceProviderFactory * factory)
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{
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}
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static void
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gst_device_provider_factory_finalize (GObject * object)
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{
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GstDeviceProviderFactory *factory = GST_DEVICE_PROVIDER_FACTORY (object);
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GstDeviceProvider *provider;
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gst_device_provider_factory_cleanup (factory);
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provider = g_atomic_pointer_get (&factory->provider);
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if (provider)
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gst_object_unref (provider);
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G_OBJECT_CLASS (gst_device_provider_factory_parent_class)->finalize (object);
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}
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/**
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* gst_device_provider_factory_find:
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* @name: name of factory to find
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*
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* Search for an device provider factory of the given name. Refs the returned
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* device provider factory; caller is responsible for unreffing.
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*
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* Returns: (transfer full) (nullable): #GstDeviceProviderFactory if
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* found, %NULL otherwise
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*
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* Since: 1.4
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*/
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GstDeviceProviderFactory *
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gst_device_provider_factory_find (const gchar * name)
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{
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GstPluginFeature *feature;
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g_return_val_if_fail (name != NULL, NULL);
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feature = gst_registry_find_feature (gst_registry_get (), name,
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GST_TYPE_DEVICE_PROVIDER_FACTORY);
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if (feature)
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return GST_DEVICE_PROVIDER_FACTORY (feature);
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/* this isn't an error, for instance when you query if an device provider factory is
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* present */
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GST_LOG ("no such device provider factory \"%s\"", name);
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return NULL;
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}
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static void
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gst_device_provider_factory_cleanup (GstDeviceProviderFactory * factory)
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{
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if (factory->metadata) {
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gst_structure_free ((GstStructure *) factory->metadata);
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factory->metadata = NULL;
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}
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if (factory->type) {
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factory->type = G_TYPE_INVALID;
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}
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}
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#define CHECK_METADATA_FIELD(klass, name, key) \
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G_STMT_START { \
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const gchar *metafield = gst_device_provider_class_get_metadata (klass, key); \
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if (G_UNLIKELY (metafield == NULL || *metafield == '\0')) { \
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g_warning ("Device provider factory metadata for '%s' has no valid %s field", name, key); \
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goto detailserror; \
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} \
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} G_STMT_END;
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/**
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* gst_device_provider_register:
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* @plugin: (allow-none): #GstPlugin to register the device provider with, or %NULL for
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* a static device provider.
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* @name: name of device providers of this type
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* @rank: rank of device provider (higher rank means more importance when autoplugging)
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* @type: GType of device provider to register
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*
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* Create a new device providerfactory capable of instantiating objects of the
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* @type and add the factory to @plugin.
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*
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* Returns: %TRUE, if the registering succeeded, %FALSE on error
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*
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* Since: 1.4
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*/
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gboolean
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gst_device_provider_register (GstPlugin * plugin, const gchar * name,
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guint rank, GType type)
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{
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GstPluginFeature *existing_feature;
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GstRegistry *registry;
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GstDeviceProviderFactory *factory;
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GstDeviceProviderClass *klass;
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g_return_val_if_fail (name != NULL, FALSE);
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g_return_val_if_fail (g_type_is_a (type, GST_TYPE_DEVICE_PROVIDER), FALSE);
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registry = gst_registry_get ();
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/* check if feature already exists, if it exists there is no need to update it
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* when the registry is getting updated, outdated plugins and all their
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* features are removed and readded.
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*/
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existing_feature = gst_registry_lookup_feature (registry, name);
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if (existing_feature) {
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GST_DEBUG_OBJECT (registry, "update existing feature %p (%s)",
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existing_feature, name);
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factory = GST_DEVICE_PROVIDER_FACTORY_CAST (existing_feature);
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factory->type = type;
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existing_feature->loaded = TRUE;
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g_type_set_qdata (type, __gst_deviceproviderclass_factory, factory);
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gst_object_unref (existing_feature);
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return TRUE;
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}
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factory =
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GST_DEVICE_PROVIDER_FACTORY_CAST (g_object_newv
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(GST_TYPE_DEVICE_PROVIDER_FACTORY, 0, NULL));
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gst_plugin_feature_set_name (GST_PLUGIN_FEATURE_CAST (factory), name);
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GST_LOG_OBJECT (factory, "Created new device providerfactory for type %s",
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g_type_name (type));
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/* provide info needed during class structure setup */
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g_type_set_qdata (type, __gst_deviceproviderclass_factory, factory);
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klass = GST_DEVICE_PROVIDER_CLASS (g_type_class_ref (type));
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CHECK_METADATA_FIELD (klass, name, GST_ELEMENT_METADATA_LONGNAME);
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CHECK_METADATA_FIELD (klass, name, GST_ELEMENT_METADATA_KLASS);
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CHECK_METADATA_FIELD (klass, name, GST_ELEMENT_METADATA_DESCRIPTION);
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CHECK_METADATA_FIELD (klass, name, GST_ELEMENT_METADATA_AUTHOR);
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factory->type = type;
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factory->metadata = gst_structure_copy ((GstStructure *) klass->metadata);
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if (plugin && plugin->desc.name) {
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GST_PLUGIN_FEATURE_CAST (factory)->plugin_name = plugin->desc.name;
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GST_PLUGIN_FEATURE_CAST (factory)->plugin = plugin;
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g_object_add_weak_pointer ((GObject *) plugin,
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(gpointer *) & GST_PLUGIN_FEATURE_CAST (factory)->plugin);
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} else {
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GST_PLUGIN_FEATURE_CAST (factory)->plugin_name = "NULL";
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GST_PLUGIN_FEATURE_CAST (factory)->plugin = NULL;
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}
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gst_plugin_feature_set_rank (GST_PLUGIN_FEATURE_CAST (factory), rank);
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GST_PLUGIN_FEATURE_CAST (factory)->loaded = TRUE;
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gst_registry_add_feature (registry, GST_PLUGIN_FEATURE_CAST (factory));
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return TRUE;
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/* ERRORS */
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detailserror:
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{
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gst_device_provider_factory_cleanup (factory);
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return FALSE;
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}
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}
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/**
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* gst_device_provider_factory_get:
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* @factory: factory to instantiate
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*
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* Returns the device provider of the type defined by the given device
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* providerfactory.
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*
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* Returns: (transfer full) (nullable): the #GstDeviceProvider or %NULL
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* if the device provider couldn't be created
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*
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* Since: 1.4
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*/
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GstDeviceProvider *
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gst_device_provider_factory_get (GstDeviceProviderFactory * factory)
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{
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GstDeviceProvider *device_provider;
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GstDeviceProviderClass *oclass;
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GstDeviceProviderFactory *newfactory;
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g_return_val_if_fail (factory != NULL, NULL);
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newfactory =
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GST_DEVICE_PROVIDER_FACTORY (gst_plugin_feature_load (GST_PLUGIN_FEATURE
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(factory)));
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if (newfactory == NULL)
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goto load_failed;
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factory = newfactory;
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GST_INFO ("getting device provider \"%s\"", GST_OBJECT_NAME (factory));
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if (factory->type == 0)
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goto no_type;
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device_provider = g_atomic_pointer_get (&newfactory->provider);
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if (device_provider) {
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gst_object_unref (factory);
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return gst_object_ref (device_provider);
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}
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/* create an instance of the device provider, cast so we don't assert on NULL
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* also set name as early as we can
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*/
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device_provider = GST_DEVICE_PROVIDER_CAST (g_object_newv (factory->type, 0,
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NULL));
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if (G_UNLIKELY (device_provider == NULL))
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goto no_device_provider;
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/* fill in the pointer to the factory in the device provider class. The
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* class will not be unreffed currently.
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* Be thread safe as there might be 2 threads creating the first instance of
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* an device provider at the same moment
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*/
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oclass = GST_DEVICE_PROVIDER_GET_CLASS (device_provider);
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if (!g_atomic_pointer_compare_and_exchange (&oclass->factory, NULL, factory)) {
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gst_object_unref (factory);
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} else {
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/* This ref will never be dropped as the class is never destroyed */
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GST_OBJECT_FLAG_SET (factory, GST_OBJECT_FLAG_MAY_BE_LEAKED);
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}
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gst_object_ref_sink (device_provider);
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/* We use an atomic to make sure we don't create two in parallel */
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if (!g_atomic_pointer_compare_and_exchange (&newfactory->provider, NULL,
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device_provider)) {
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gst_object_unref (device_provider);
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device_provider = g_atomic_pointer_get (&newfactory->provider);
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}
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GST_DEBUG ("created device provider \"%s\"", GST_OBJECT_NAME (factory));
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return gst_object_ref (device_provider);
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/* ERRORS */
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load_failed:
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{
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GST_WARNING_OBJECT (factory,
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"loading plugin containing feature %s returned NULL!",
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GST_OBJECT_NAME (factory));
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return NULL;
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}
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no_type:
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{
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GST_WARNING_OBJECT (factory, "factory has no type");
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gst_object_unref (factory);
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return NULL;
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}
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no_device_provider:
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{
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GST_WARNING_OBJECT (factory, "could not create device provider");
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gst_object_unref (factory);
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return NULL;
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}
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}
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/**
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* gst_device_provider_factory_get_by_name:
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* @factoryname: a named factory to instantiate
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*
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* Returns the device provider of the type defined by the given device
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* provider factory.
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*
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* Returns: (transfer full) (nullable): a #GstDeviceProvider or %NULL
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* if unable to create device provider
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*
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* Since: 1.4
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*/
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GstDeviceProvider *
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gst_device_provider_factory_get_by_name (const gchar * factoryname)
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{
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GstDeviceProviderFactory *factory;
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GstDeviceProvider *device_provider;
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g_return_val_if_fail (factoryname != NULL, NULL);
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g_return_val_if_fail (gst_is_initialized (), NULL);
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GST_LOG ("gstdeviceproviderfactory: get_by_name \"%s\"", factoryname);
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factory = gst_device_provider_factory_find (factoryname);
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if (factory == NULL)
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goto no_factory;
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GST_LOG_OBJECT (factory, "found factory %p", factory);
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device_provider = gst_device_provider_factory_get (factory);
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if (device_provider == NULL)
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goto create_failed;
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gst_object_unref (factory);
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return device_provider;
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/* ERRORS */
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no_factory:
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{
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GST_INFO ("no such device provider factory \"%s\"!", factoryname);
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return NULL;
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}
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create_failed:
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{
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GST_INFO_OBJECT (factory, "couldn't create instance!");
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gst_object_unref (factory);
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return NULL;
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}
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}
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/**
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* gst_device_provider_factory_get_device_provider_type:
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* @factory: factory to get managed #GType from
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*
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* Get the #GType for device providers managed by this factory. The type can
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* only be retrieved if the device provider factory is loaded, which can be
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* assured with gst_plugin_feature_load().
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*
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* Returns: the #GType for device providers managed by this factory.
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*
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* Since: 1.4
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*/
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GType
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gst_device_provider_factory_get_device_provider_type (GstDeviceProviderFactory *
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factory)
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{
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g_return_val_if_fail (GST_IS_DEVICE_PROVIDER_FACTORY (factory),
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G_TYPE_INVALID);
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return factory->type;
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}
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/**
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* gst_device_provider_factory_get_metadata:
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* @factory: a #GstDeviceProviderFactory
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* @key: a key
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*
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* Get the metadata on @factory with @key.
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*
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* Returns: (nullable): the metadata with @key on @factory or %NULL
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* when there was no metadata with the given @key.
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*
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* Since: 1.4
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*/
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const gchar *
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gst_device_provider_factory_get_metadata (GstDeviceProviderFactory * factory,
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const gchar * key)
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{
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return gst_structure_get_string ((GstStructure *) factory->metadata, key);
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}
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/**
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* gst_device_provider_factory_get_metadata_keys:
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* @factory: a #GstDeviceProviderFactory
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*
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* Get the available keys for the metadata on @factory.
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*
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* Returns: (transfer full) (element-type utf8) (array zero-terminated=1) (nullable):
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* a %NULL-terminated array of key strings, or %NULL when there is no
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* metadata. Free with g_strfreev() when no longer needed.
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*
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* Since: 1.4
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*/
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gchar **
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gst_device_provider_factory_get_metadata_keys (GstDeviceProviderFactory *
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factory)
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{
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GstStructure *metadata;
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gchar **arr;
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gint i, num;
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g_return_val_if_fail (GST_IS_DEVICE_PROVIDER_FACTORY (factory), NULL);
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metadata = (GstStructure *) factory->metadata;
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if (metadata == NULL)
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return NULL;
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num = gst_structure_n_fields (metadata);
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if (num == 0)
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return NULL;
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arr = g_new (gchar *, num + 1);
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for (i = 0; i < num; ++i) {
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arr[i] = g_strdup (gst_structure_nth_field_name (metadata, i));
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}
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arr[i] = NULL;
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return arr;
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}
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/**
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* gst_device_provider_factory_has_classesv:
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* @factory: a #GstDeviceProviderFactory
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* @classes: (array zero-terminated=1) (allow-none): a %NULL terminated array
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* of classes to match, only match if all classes are matched
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*
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* Check if @factory matches all of the given classes
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*
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* Returns: %TRUE if @factory matches.
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*
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* Since: 1.4
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*/
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gboolean
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gst_device_provider_factory_has_classesv (GstDeviceProviderFactory * factory,
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gchar ** classes)
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{
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const gchar *klass;
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g_return_val_if_fail (GST_IS_DEVICE_PROVIDER_FACTORY (factory), FALSE);
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klass = gst_device_provider_factory_get_metadata (factory,
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GST_ELEMENT_METADATA_KLASS);
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if (klass == NULL) {
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GST_ERROR_OBJECT (factory,
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"device provider factory is missing klass identifiers");
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return FALSE;
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}
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for (; classes != NULL && classes[0] != NULL; classes++) {
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const gchar *found;
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guint len;
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if (classes[0][0] == '\0')
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continue;
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found = strstr (klass, classes[0]);
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if (!found)
|
|
return FALSE;
|
|
if (found != klass && *(found - 1) != '/')
|
|
return FALSE;
|
|
|
|
len = strlen (classes[0]);
|
|
if (found[len] != 0 && found[len] != '/')
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_device_provider_factory_has_classes:
|
|
* @factory: a #GstDeviceProviderFactory
|
|
* @classes: (allow-none): a "/" separate list of classes to match, only match
|
|
* if all classes are matched
|
|
*
|
|
* Check if @factory matches all of the given @classes
|
|
*
|
|
* Returns: %TRUE if @factory matches or if @classes is %NULL.
|
|
*
|
|
* Since: 1.4
|
|
*/
|
|
gboolean
|
|
gst_device_provider_factory_has_classes (GstDeviceProviderFactory * factory,
|
|
const gchar * classes)
|
|
{
|
|
gchar **classesv;
|
|
gboolean res;
|
|
|
|
if (classes == NULL)
|
|
return TRUE;
|
|
|
|
classesv = g_strsplit (classes, "/", 0);
|
|
|
|
res = gst_device_provider_factory_has_classesv (factory, classesv);
|
|
|
|
g_strfreev (classesv);
|
|
|
|
return res;
|
|
}
|
|
|
|
static gboolean
|
|
device_provider_filter (GstPluginFeature * feature, GstRank * minrank)
|
|
{
|
|
/* we only care about device provider factories */
|
|
if (G_UNLIKELY (!GST_IS_DEVICE_PROVIDER_FACTORY (feature)))
|
|
return FALSE;
|
|
|
|
return (gst_plugin_feature_get_rank (feature) >= *minrank);
|
|
}
|
|
|
|
/**
|
|
* gst_device_provider_factory_list_get_device_providers:
|
|
* @minrank: Minimum rank
|
|
*
|
|
* Get a list of factories with a rank greater or equal to @minrank.
|
|
* The list of factories is returned by decreasing rank.
|
|
*
|
|
* Returns: (transfer full) (element-type Gst.DeviceProviderFactory):
|
|
* a #GList of #GstDeviceProviderFactory device providers. Use
|
|
* gst_plugin_feature_list_free() after usage.
|
|
*
|
|
* Since: 1.4
|
|
*/
|
|
GList *
|
|
gst_device_provider_factory_list_get_device_providers (GstRank minrank)
|
|
{
|
|
GList *result;
|
|
|
|
/* get the feature list using the filter */
|
|
result = gst_registry_feature_filter (gst_registry_get (),
|
|
(GstPluginFeatureFilter) device_provider_filter, FALSE, &minrank);
|
|
|
|
/* sort on rank and name */
|
|
result = g_list_sort (result, gst_plugin_feature_rank_compare_func);
|
|
|
|
return result;
|
|
}
|