gstreamer/ges/ges-effect.c
Thibault Saunier 05115da59e effect: Allow setting properties on any element specified by the user
Those are the elements he cares about and we should expose their APIs
as is, event if they are not classified as effects. For example if
the user want to use a capsfilter as effect, he should be able to set
its caps.
2018-04-20 19:24:56 -03:00

405 lines
12 KiB
C

/* GStreamer Editing Services
* Copyright (C) 2010 Thibault Saunier <thibault.saunier@collabora.co.uk>
*
* 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:geseffect
* @title: GESEffect
* @short_description: adds an effect build from a parse-launch style
* bin description to a stream in a GESSourceClip or a GESLayer
*/
#include "ges-internal.h"
#include "ges-extractable.h"
#include "ges-track-element.h"
#include "ges-base-effect.h"
#include "ges-effect-asset.h"
#include "ges-effect.h"
static void ges_extractable_interface_init (GESExtractableInterface * iface);
G_DEFINE_TYPE_WITH_CODE (GESEffect,
ges_effect, GES_TYPE_BASE_EFFECT,
G_IMPLEMENT_INTERFACE (GES_TYPE_EXTRACTABLE,
ges_extractable_interface_init));
static void ges_effect_dispose (GObject * object);
static void ges_effect_finalize (GObject * object);
static GstElement *ges_effect_create_element (GESTrackElement * self);
struct _GESEffectPrivate
{
gchar *bin_description;
};
enum
{
PROP_0,
PROP_BIN_DESCRIPTION,
};
static gchar *
extractable_check_id (GType type, const gchar * id, GError ** error)
{
gchar *bin_desc, *real_id;
GESTrackType ttype;
bin_desc = ges_effect_assect_id_get_type_and_bindesc (id, &ttype, error);
if (bin_desc == NULL)
return NULL;
if (ttype == GES_TRACK_TYPE_AUDIO)
real_id = g_strdup_printf ("audio %s", bin_desc);
else if (ttype == GES_TRACK_TYPE_VIDEO)
real_id = g_strdup_printf ("video %s", bin_desc);
else
g_assert_not_reached ();
g_free (bin_desc);
return real_id;
}
static GParameter *
extractable_get_parameters_from_id (const gchar * id, guint * n_params)
{
GParameter *params = g_new0 (GParameter, 3);
gchar *bin_desc;
GESTrackType ttype;
bin_desc = ges_effect_assect_id_get_type_and_bindesc (id, &ttype, NULL);
params[0].name = "bin-description";
g_value_init (&params[0].value, G_TYPE_STRING);
g_value_set_string (&params[0].value, bin_desc);
params[1].name = "track-type";
g_value_init (&params[1].value, GES_TYPE_TRACK_TYPE);
g_value_set_flags (&params[1].value, ttype);
*n_params = 2;
g_free (bin_desc);
return params;
}
static gchar *
extractable_get_id (GESExtractable * self)
{
return g_strdup (GES_EFFECT (self)->priv->bin_description);
}
static void
ges_extractable_interface_init (GESExtractableInterface * iface)
{
iface->asset_type = GES_TYPE_EFFECT_ASSET;
iface->check_id = (GESExtractableCheckId) extractable_check_id;
iface->get_parameters_from_id = extractable_get_parameters_from_id;
iface->get_id = extractable_get_id;
}
static int
property_name_compare (gconstpointer s1, gconstpointer s2)
{
return g_strcmp0 ((const gchar *) s1, (const gchar *) s2);
}
static void
_set_child_property (GESTimelineElement * self G_GNUC_UNUSED, GObject * child,
GParamSpec * pspec, GValue * value)
{
GESEffectClass *klass = GES_EFFECT_GET_CLASS (self);
gchar *full_property_name;
GES_TIMELINE_ELEMENT_CLASS
(ges_effect_parent_class)->set_child_property (self, child, pspec, value);
full_property_name = g_strdup_printf ("%s::%s", G_OBJECT_TYPE_NAME (child),
pspec->name);
if (g_list_find_custom (klass->rate_properties, full_property_name,
property_name_compare)) {
GstElement *nleobject =
ges_track_element_get_nleobject (GES_TRACK_ELEMENT (self));
gdouble media_duration_factor =
ges_timeline_element_get_media_duration_factor (self);
g_object_set (nleobject, "media-duration-factor", media_duration_factor,
NULL);
}
}
static void
ges_effect_get_property (GObject * object,
guint property_id, GValue * value, GParamSpec * pspec)
{
GESEffectPrivate *priv = GES_EFFECT (object)->priv;
switch (property_id) {
case PROP_BIN_DESCRIPTION:
g_value_set_string (value, priv->bin_description);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ges_effect_set_property (GObject * object,
guint property_id, const GValue * value, GParamSpec * pspec)
{
GESEffect *self = GES_EFFECT (object);
switch (property_id) {
case PROP_BIN_DESCRIPTION:
self->priv->bin_description = g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ges_effect_class_init (GESEffectClass * klass)
{
GObjectClass *object_class;
GESTrackElementClass *obj_bg_class;
GESTimelineElementClass *element_class;
object_class = G_OBJECT_CLASS (klass);
obj_bg_class = GES_TRACK_ELEMENT_CLASS (klass);
element_class = GES_TIMELINE_ELEMENT_CLASS (klass);
g_type_class_add_private (klass, sizeof (GESEffectPrivate));
object_class->get_property = ges_effect_get_property;
object_class->set_property = ges_effect_set_property;
object_class->dispose = ges_effect_dispose;
object_class->finalize = ges_effect_finalize;
obj_bg_class->create_element = ges_effect_create_element;
element_class->set_child_property = _set_child_property;
klass->rate_properties = NULL;
ges_effect_class_register_rate_property (klass, "scaletempo", "rate");
ges_effect_class_register_rate_property (klass, "pitch", "tempo");
ges_effect_class_register_rate_property (klass, "pitch", "rate");
ges_effect_class_register_rate_property (klass, "videorate", "rate");
/**
* GESEffect:bin-description:
*
* The description of the effect bin with a gst-launch-style
* pipeline description.
*
* Example: "videobalance saturation=1.5 hue=+0.5"
*/
g_object_class_install_property (object_class, PROP_BIN_DESCRIPTION,
g_param_spec_string ("bin-description",
"bin description",
"Bin description of the effect",
NULL, G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
}
static void
ges_effect_init (GESEffect * self)
{
self->priv =
G_TYPE_INSTANCE_GET_PRIVATE (self, GES_TYPE_EFFECT, GESEffectPrivate);
}
static void
ges_effect_dispose (GObject * object)
{
G_OBJECT_CLASS (ges_effect_parent_class)->dispose (object);
}
static void
ges_effect_finalize (GObject * object)
{
GESEffect *self = GES_EFFECT (object);
if (self->priv->bin_description)
g_free (self->priv->bin_description);
G_OBJECT_CLASS (ges_effect_parent_class)->finalize (object);
}
static GstElement *
ges_effect_create_element (GESTrackElement * object)
{
GstElement *effect;
gchar *bin_desc;
GError *error = NULL;
GESEffect *self = GES_EFFECT (object);
const gchar *blacklisted_factories[] =
{ "audioconvert", "audioresample", "videoconvert", NULL };
GESTrackType type = ges_track_element_get_track_type (object);
if (type == GES_TRACK_TYPE_VIDEO) {
bin_desc = g_strconcat ("videoconvert name=pre_video_convert ! ",
self->priv->bin_description, " ! videoconvert name=post_video_convert",
NULL);
} else if (type == GES_TRACK_TYPE_AUDIO) {
bin_desc =
g_strconcat ("audioconvert ! audioresample !",
self->priv->bin_description, NULL);
} else {
g_assert_not_reached ();
}
effect = gst_parse_bin_from_description (bin_desc, TRUE, &error);
g_free (bin_desc);
if (error != NULL) {
GST_ERROR ("An error occured while creating the GstElement: %s",
error->message);
g_error_free (error);
return NULL;
}
ges_track_element_add_children_props (object, effect, NULL,
blacklisted_factories, NULL);
return effect;
}
/**
* ges_effect_new:
* @bin_description: The gst-launch like bin description of the effect
*
* Creates a new #GESEffect from the description of the bin. It should be
* possible to determine the type of the effect through the element
* 'klass' metadata of the GstElements that will be created.
* In that corner case, you should use:
* #ges_asset_request (GES_TYPE_EFFECT, "audio your ! bin ! description", NULL);
* and extract that asset to be in full control.
*
* Returns: (nullable): a newly created #GESEffect, or %NULL if something went
* wrong.
*/
GESEffect *
ges_effect_new (const gchar * bin_description)
{
GESEffect *effect;
GESAsset *asset = ges_asset_request (GES_TYPE_EFFECT,
bin_description, NULL);
g_return_val_if_fail (asset, NULL);
effect = GES_EFFECT (ges_asset_extract (asset, NULL));
gst_object_unref (asset);
return effect;
}
/**
* ges_effect_class_register_rate_property:
* @klass: Instance of the GESEffectClass
* @element_name: Name of the GstElement that changes the rate
* @property_name: Name of the property that changes the rate
*
* Register an element that can change the rate at which media is playing. The
* property type must be float or double, and must be a factor of the rate,
* i.e. a value of 2.0 must mean that the media plays twice as fast. For
* example, this is true for the properties 'rate' and 'tempo' of the element
* 'pitch', which is already registered by default. By registering the element,
* timeline duration can be correctly converted into media duration, allowing
* the right segment seeks to be sent to the sources.
*
* A reference to the GESEffectClass can be obtained as follows:
* GES_EFFECT_CLASS (g_type_class_ref (GES_TYPE_EFFECT));
*
* Returns: whether the rate property was succesfully registered. When this
* method returns false, a warning is emitted with more information.
*/
gboolean
ges_effect_class_register_rate_property (GESEffectClass * klass,
const gchar * element_name, const gchar * property_name)
{
GstElementFactory *element_factory = NULL;
GstElement *element = NULL;
GParamSpec *pspec = NULL;
gchar *full_property_name = NULL;
GType param_type;
gboolean res = FALSE;
element_factory = gst_element_factory_find (element_name);
if (element_factory == NULL) {
GST_WARNING
("Did not add rate property '%s' for element '%s': the element factory could not be found",
property_name, element_name);
goto fail;
}
element = gst_element_factory_create (element_factory, NULL);
if (element == NULL) {
GST_WARNING
("Did not add rate property '%s' for element '%s': the element could not be constructed",
property_name, element_name);
goto fail;
}
pspec =
g_object_class_find_property (G_OBJECT_GET_CLASS (element),
property_name);
if (pspec == NULL) {
GST_WARNING
("Did not add rate property '%s' for element '%s': the element did not have the property name specified",
property_name, element_name);
goto fail;
}
param_type = G_PARAM_SPEC_VALUE_TYPE (pspec);
if (param_type != G_TYPE_FLOAT && param_type != G_TYPE_DOUBLE) {
GST_WARNING
("Did not add rate property '%s' for element '%s': the property is not of float or double type",
property_name, element_name);
goto fail;
}
full_property_name = g_strdup_printf ("%s::%s",
g_type_name (gst_element_factory_get_element_type (element_factory)),
property_name);
if (g_list_find_custom (klass->rate_properties, full_property_name,
property_name_compare) == NULL) {
klass->rate_properties =
g_list_append (klass->rate_properties, full_property_name);
GST_DEBUG ("Added rate property %s", full_property_name);
} else {
g_free (full_property_name);
}
res = TRUE;
fail:
if (element_factory != NULL)
gst_object_unref (element_factory);
if (element != NULL)
gst_object_unref (element);
if (pspec != NULL)
g_param_spec_unref (pspec);
return res;
}