gstreamer/subprojects/gst-plugins-bad/gst/autoconvert/gstautoconvert.c

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/* GStreamer
*
2012-01-25 15:37:22 +00:00
* Copyright 2007-2012 Collabora Ltd
* @author: Olivier Crete <olivier.crete@collabora.com>
* Copyright 2007-2008 Nokia
* Copyright 2023-2024 Igalia S.L.
* @author: Thibault Saunier <tsaunier@igalia.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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-autoconvert
* @title: autoconvert
*
* The #autoconvert element has one sink and one source pad. It will look for
* other elements that also have one sink and one source pad.
* It will then pick an element that matches the caps on both sides.
* If the caps change, it may change the selected element if the current one
* no longer matches the caps.
*
* The list of element it will look into can be specified in the
* #GstAutoConvert:factories property, otherwise it will look at all available
* elements.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstautoconvert.h"
#include <gst/pbutils/pbutils.h>
GST_DEBUG_CATEGORY (autoconvert_debug);
#define GST_CAT_DEFAULT (autoconvert_debug)
struct _GstAutoConvert
{
GstBaseAutoConvert parent;
};
G_DEFINE_TYPE (GstAutoConvert, gst_auto_convert, GST_TYPE_BASE_AUTO_CONVERT);
GST_ELEMENT_REGISTER_DEFINE (autoconvert, "autoconvert",
GST_RANK_NONE, gst_auto_convert_get_type ());
enum
{
PROP_0,
PROP_FACTORIES,
PROP_FACTORY_NAMES,
};
static void
gst_auto_convert_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstBaseAutoConvert *baseautoconvert = GST_BASE_AUTO_CONVERT (object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
case PROP_FACTORIES:
{
GList *factories;
factories = g_value_get_pointer (value);
GST_OBJECT_LOCK (object);
if (!baseautoconvert->factories)
baseautoconvert->factories =
g_list_copy_deep (factories, (GCopyFunc) gst_object_ref, NULL);
else
GST_WARNING_OBJECT (object, "Can not reset factories after they"
" have been set or auto-discovered");
GST_OBJECT_UNLOCK (object);
break;
}
case PROP_FACTORY_NAMES:
{
GST_OBJECT_LOCK (object);
if (!baseautoconvert->factories) {
gint i;
for (i = 0; i < gst_value_array_get_size (value); i++) {
const GValue *v = gst_value_array_get_value (value, i);
GstElementFactory *factory = (GstElementFactory *)
gst_registry_find_feature (gst_registry_get (),
g_value_get_string (v), GST_TYPE_ELEMENT_FACTORY);
if (!factory) {
gst_element_post_message (GST_ELEMENT_CAST (baseautoconvert),
gst_missing_element_message_new (GST_ELEMENT_CAST
(baseautoconvert), g_value_get_string (v)));
continue;
}
baseautoconvert->factories =
g_list_append (baseautoconvert->factories, factory);
}
} else {
GST_WARNING_OBJECT (object, "Can not reset factories after they"
" have been set or auto-discovered");
}
GST_OBJECT_UNLOCK (object);
break;
}
}
}
static void
gst_auto_convert_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstBaseAutoConvert *baseautoconvert = GST_BASE_AUTO_CONVERT (object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
case PROP_FACTORIES:
GST_OBJECT_LOCK (object);
g_value_set_pointer (value, baseautoconvert->factories);
GST_OBJECT_UNLOCK (object);
break;
case PROP_FACTORY_NAMES:
{
GList *tmp;
GST_OBJECT_LOCK (object);
for (tmp = baseautoconvert->factories; tmp; tmp = tmp->next) {
GValue factory = G_VALUE_INIT;
g_value_init (&factory, G_TYPE_STRING);
g_value_take_string (&factory, gst_object_get_name (tmp->data));
gst_value_array_append_and_take_value (value, &factory);
}
GST_OBJECT_UNLOCK (object);
break;
}
}
}
static void
gst_auto_convert_class_init (GstAutoConvertClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GST_DEBUG_CATEGORY_INIT (autoconvert_debug, "autoconvert", 0,
"Auto convert element");
gobject_class->set_property = gst_auto_convert_set_property;
gobject_class->get_property = gst_auto_convert_get_property;
gst_element_class_set_static_metadata (element_class,
"Select converter based on caps", "Generic/Bin",
"Selects the right transform element based on the caps",
"Olivier Crete <olivier.crete@collabora.com>");
g_object_class_install_property (gobject_class, PROP_FACTORIES,
g_param_spec_pointer ("factories",
"GList of GstElementFactory",
"GList of GstElementFactory objects to pick from (the element takes"
" ownership of the list (NULL means it will go through all possible"
" elements), can only be set once",
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* autoconvert:factory-names:
*
* A #GstValueArray of factory names to use
*
* Since: 1.24
*/
g_object_class_install_property (gobject_class, PROP_FACTORY_NAMES,
gst_param_spec_array ("factory-names", "Factory names"
"Names of the Factories to use",
"Names of the GstElementFactory to be used to automatically plug"
" elements.",
g_param_spec_string ("factory-name", "Factory name",
"An element factory name", NULL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS),
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
GST_BASE_AUTO_CONVERT_CLASS (klass)->registers_filters = FALSE;
}
static void
gst_auto_convert_init (GstAutoConvert * autoconvert)
{
}