gstreamer/ges/ges-effect.c
2017-03-08 18:13:48 -03:00

375 lines
11 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 ();
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 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;
object_class = G_OBJECT_CLASS (klass);
obj_bg_class = GES_TRACK_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;
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");
/**
* 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 *wanted_categories[] = { "Effect", 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;
}
GST_DEBUG ("Created effect %p", effect);
ges_track_element_add_children_props (object, effect, wanted_categories,
NULL, 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;
}
static int
property_name_compare (gconstpointer s1, gconstpointer s2)
{
return g_strcmp0 ((const gchar *) s1, (const gchar *) s2);
}
/**
* 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;
}