gstreamer/ges/ges-extractable.c
2014-02-27 09:54:41 +01:00

288 lines
8 KiB
C

/* GStreamer Editing Services
*
* Copyright (C) 2012 Thibault Saunier <thibault.saunier@collabora.com>
* Copyright (C) 2012 Volodymyr Rudyi <vladimir.rudoy@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION: ges-extractable
* @short_description: An interface for objects which can be extracted from a GESAsset
*
* FIXME: Long description needed
*/
#include "ges-asset.h"
#include "ges-internal.h"
#include "ges-extractable.h"
#include "ges-uri-clip.h"
static GQuark ges_asset_key;
G_DEFINE_INTERFACE_WITH_CODE (GESExtractable, ges_extractable,
G_TYPE_INITIALLY_UNOWNED,
ges_asset_key = g_quark_from_static_string ("ges-extractable-data"));
static gchar *
ges_extractable_check_id_default (GType type, const gchar * id, GError ** error)
{
return g_strdup (g_type_name (type));
}
static GType
ges_extractable_get_real_extractable_type_default (GType type, const gchar * id)
{
return type;
}
static GParameter *
extractable_get_parameters_from_id (const gchar * id, guint * n_params)
{
*n_params = 0;
return NULL;
}
static gchar *
extractable_get_id (GESExtractable * self)
{
return g_strdup (g_type_name (G_OBJECT_TYPE (self)));
}
static void
ges_extractable_default_init (GESExtractableInterface * iface)
{
iface->asset_type = GES_TYPE_ASSET;
iface->check_id = ges_extractable_check_id_default;
iface->get_real_extractable_type =
ges_extractable_get_real_extractable_type_default;
iface->get_parameters_from_id = extractable_get_parameters_from_id;
iface->set_asset = NULL;
iface->get_id = extractable_get_id;
iface->register_metas = NULL;
iface->can_update_asset = FALSE;
}
/**
* ges_extractable_get_asset:
* @self: The #GESExtractable from which to retrieve a #GESAsset
*
* Method for getting an asset from a #GESExtractable
*
* Returns: (transfer none): The #GESAsset or %NULL if none has been set
*/
GESAsset *
ges_extractable_get_asset (GESExtractable * self)
{
g_return_val_if_fail (GES_IS_EXTRACTABLE (self), NULL);
return g_object_get_qdata (G_OBJECT (self), ges_asset_key);;
}
/**
* ges_extractable_set_asset:
* @self: Target object
* @asset: (transfer none): The #GESAsset to set
*
* Method to set the asset which instantiated the specified object
*/
void
ges_extractable_set_asset (GESExtractable * self, GESAsset * asset)
{
GESExtractableInterface *iface;
g_return_if_fail (GES_IS_EXTRACTABLE (self));
iface = GES_EXTRACTABLE_GET_INTERFACE (self);
GST_DEBUG_OBJECT (self, "Setting asset to %" GST_PTR_FORMAT, asset);
if (iface->can_update_asset == FALSE &&
g_object_get_qdata (G_OBJECT (self), ges_asset_key)) {
GST_WARNING_OBJECT (self, "Can not reset asset on object");
return;
}
g_object_set_qdata_full (G_OBJECT (self), ges_asset_key,
gst_object_ref (asset), gst_object_unref);
/* Let classes that implement the interface know that a asset has been set */
if (iface->set_asset)
iface->set_asset (self, asset);
}
/**
* ges_extractable_get_id:
* @self: The #GESExtractable
*
* Returns: The #id of the associated #GESAsset, free with #g_free
*/
gchar *
ges_extractable_get_id (GESExtractable * self)
{
g_return_val_if_fail (GES_IS_EXTRACTABLE (self), NULL);
return GES_EXTRACTABLE_GET_INTERFACE (self)->get_id (self);
}
/**
* ges_extractable_type_get_parameters_for_id:
* @type: The #GType implementing #GESExtractable
* @id: The ID of the Extractable
* @n_params: (out): Return location for the returned array
*
* Returns: (transfer full) (array length=n_params): an array of #GParameter
* needed to extract the #GESExtractable from a #GESAsset of @id
*/
GParameter *
ges_extractable_type_get_parameters_from_id (GType type, const gchar * id,
guint * n_params)
{
GObjectClass *klass;
GESExtractableInterface *iface;
GParameter *ret = NULL;
g_return_val_if_fail (g_type_is_a (type, G_TYPE_OBJECT), NULL);
g_return_val_if_fail (g_type_is_a (type, GES_TYPE_EXTRACTABLE), NULL);
klass = g_type_class_ref (type);
iface = g_type_interface_peek (klass, GES_TYPE_EXTRACTABLE);
ret = iface->get_parameters_from_id (id, n_params);
g_type_class_unref (klass);
return ret;
}
/**
* ges_extractable_type_get_asset_type:
* @type: The #GType implementing #GESExtractable
*
* Get the #GType, subclass of #GES_TYPE_ASSET to instanciate
* to be able to extract a @type
*
* Returns: the #GType to use to create a asset to extract @type
*/
GType
ges_extractable_type_get_asset_type (GType type)
{
GObjectClass *klass;
GESExtractableInterface *iface;
g_return_val_if_fail (g_type_is_a (type, G_TYPE_OBJECT), G_TYPE_INVALID);
g_return_val_if_fail (g_type_is_a (type, GES_TYPE_EXTRACTABLE),
G_TYPE_INVALID);
klass = g_type_class_ref (type);
iface = g_type_interface_peek (klass, GES_TYPE_EXTRACTABLE);
g_type_class_unref (klass);
return iface->asset_type;
}
/**
* ges_extractable_type_check_id:
* @type: The #GType implementing #GESExtractable
* @id: The ID to check
*
* Check if @id is valid for @type
*
* Returns: (transfer full): A newly allocated string containing the actuall
* ID (after some processing) or %NULL if the ID is wrong.
*/
gchar *
ges_extractable_type_check_id (GType type, const gchar * id, GError ** error)
{
GObjectClass *klass;
GESExtractableInterface *iface;
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
g_return_val_if_fail (g_type_is_a (type, G_TYPE_OBJECT), NULL);
g_return_val_if_fail (g_type_is_a (type, GES_TYPE_EXTRACTABLE), NULL);
klass = g_type_class_ref (type);
iface = g_type_interface_peek (klass, GES_TYPE_EXTRACTABLE);
g_type_class_unref (klass);
return iface->check_id (type, id, error);
}
/**
* ges_extractable_get_real_extractable_type:
* @type: The #GType implementing #GESExtractable
* @id: The ID to check
*
* Get the #GType that should be used as extractable_type for @type and
* @id. Usually this will be the same as @type but in some cases they can
* be some subclasses of @type. For example, in the case of #GESFormatter,
* the returned #GType will be a subclass of #GESFormatter that can be used
* to load the file pointed by @id.
*
* Returns: Return the #GESExtractable type that should be used for @id
*/
GType
ges_extractable_get_real_extractable_type_for_id (GType type, const gchar * id)
{
GType ret;
GObjectClass *klass;
GESExtractableInterface *iface;
klass = g_type_class_ref (type);
iface = g_type_interface_peek (klass, GES_TYPE_EXTRACTABLE);
g_type_class_unref (klass);
ret = iface->get_real_extractable_type (type, id);
GST_DEBUG ("Extractable type for id %s and wanted type %s is: %s",
id, g_type_name (type), g_type_name (ret));
return ret;
}
/**
* ges_extractable_register_metas:
* @self: A #GESExtractable
* @asset: The #GESAsset on which metadatas should be registered
*
* Lets you register standard method for @extractable_type on @asset
*
* Returns: %TRUE if metas could be register %FALSE otherwize
*/
gboolean
ges_extractable_register_metas (GType extractable_type, GESAsset * asset)
{
GObjectClass *klass;
gboolean ret = FALSE;
GESExtractableInterface *iface;
g_return_val_if_fail (g_type_is_a (extractable_type, GES_TYPE_EXTRACTABLE),
FALSE);
klass = g_type_class_ref (extractable_type);
iface = g_type_interface_peek (klass, GES_TYPE_EXTRACTABLE);
if (iface->register_metas)
ret = iface->register_metas (iface, klass, asset);
g_type_class_unref (klass);
return ret;
}