gstreamer/ges/ges-effect.c
Thibault Saunier c09de963be ges: Refactor the way we plug converters in effects
Stopping to do it at the bin description level but properly
plugging them where they are needed and cleanly ghosting the pads
where it makes most sense.

This introduces support for GES to request pads on the most upstream
element in case no static pad can be ghosted.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/187>
2020-06-17 10:48:41 -04:00

488 lines
15 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
*
* Currently we only support effects with N sinkpads and one single srcpad.
* Apart from `gesaudiomixer` and `gescompositor` which can be used as effects
* and where sinkpads will be requested as needed based on the timeline topology
* GES will always request at most one sinkpad per effect (when required).
*
* > Note: GES always adds converters (`audioconvert ! audioresample !
* > audioconvert` for audio effects and `videoconvert` for video effects) to
* > make it simpler for end users.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#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);
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,
};
G_DEFINE_TYPE_WITH_CODE (GESEffect,
ges_effect, GES_TYPE_BASE_EFFECT, G_ADD_PRIVATE (GESEffect)
G_IMPLEMENT_INTERFACE (GES_TYPE_EXTRACTABLE,
ges_extractable_interface_init));
static gchar *
extractable_check_id (GType type, const gchar * id, GError ** error)
{
gchar *bin_desc, *real_id;
GESTrackType ttype;
bin_desc = ges_effect_asset_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;
}
G_GNUC_BEGIN_IGNORE_DEPRECATIONS; /* Start ignoring GParameter deprecation */
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_asset_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;
}
G_GNUC_END_IGNORE_DEPRECATIONS; /* End ignoring GParameter deprecation */
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
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);
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");
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 = ges_effect_get_instance_private (self);
}
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 gdouble
_get_rate_factor (GESBaseEffect * effect, GHashTable * rate_values)
{
GHashTableIter iter;
gpointer key, val;
gdouble factor = 1.0;
g_hash_table_iter_init (&iter, rate_values);
while (g_hash_table_iter_next (&iter, &key, &val)) {
GValue *value = val;
gchar *prop_name = key;
gdouble rate = 1.0;
switch (G_VALUE_TYPE (value)) {
case G_TYPE_DOUBLE:
rate = g_value_get_double (value);
break;
case G_TYPE_FLOAT:
rate = g_value_get_float (value);
break;
default:
GST_ERROR_OBJECT (effect, "Rate property %s has neither a gdouble "
"nor gfloat value", prop_name);
break;
}
factor *= rate;
}
return factor;
}
static GstClockTime
_rate_source_to_sink (GESBaseEffect * effect, GstClockTime time,
GHashTable * rate_values, gpointer user_data)
{
/* multiply by rate factor
* E.g. rate=2.0, then the time 30 at the source would become
* 60 at the sink because we are using up twice as much data in a given
* time */
gdouble rate_factor = _get_rate_factor (effect, rate_values);
if (time == 0)
return 0;
if (rate_factor == 0.0) {
GST_ERROR_OBJECT (effect, "The rate effect has a rate of 0");
return 0;
}
return (GstClockTime) (time * rate_factor);
}
static GstClockTime
_rate_sink_to_source (GESBaseEffect * effect, GstClockTime time,
GHashTable * rate_values, gpointer user_data)
{
/* divide by rate factor */
gdouble rate_factor = _get_rate_factor (effect, rate_values);
if (time == 0)
return 0;
if (rate_factor == 0.0) {
GST_ERROR_OBJECT (effect, "The rate effect has a rate of 0");
return GST_CLOCK_TIME_NONE;
}
return (GstClockTime) (time / rate_factor);
}
static GstElement *
ges_effect_create_element (GESTrackElement * object)
{
GList *tmp;
GESEffectClass *class;
GstElement *effect;
gboolean is_rate_effect = FALSE;
GESBaseEffect *base_effect = GES_BASE_EFFECT (object);
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 (!g_strcmp0 (self->priv->bin_description, "gesaudiomixer") ||
!g_strcmp0 (self->priv->bin_description, "gescompositor"))
return gst_element_factory_make (self->priv->bin_description, NULL);
effect =
ges_effect_from_description (self->priv->bin_description, type, &error);
if (error != NULL) {
GST_ERROR ("An error occurred while creating the GstElement: %s",
error->message);
g_error_free (error);
goto fail;
}
ges_track_element_add_children_props (object, effect, NULL,
blacklisted_factories, NULL);
class = GES_EFFECT_CLASS (g_type_class_peek (GES_TYPE_EFFECT));
for (tmp = class->rate_properties; tmp; tmp = tmp->next) {
gchar *prop = tmp->data;
if (ges_timeline_element_lookup_child (GES_TIMELINE_ELEMENT (object), prop,
NULL, NULL)) {
if (!ges_base_effect_register_time_property (base_effect, prop))
GST_ERROR_OBJECT (object, "Failed to register rate property %s", prop);
is_rate_effect = TRUE;
}
}
if (is_rate_effect
&& !ges_base_effect_set_time_translation_funcs (base_effect,
_rate_source_to_sink, _rate_sink_to_source, NULL, NULL))
GST_ERROR_OBJECT (object, "Failed to set rate translation functions");
done:
return effect;
fail:
gst_clear_object (&effect);
goto done;
}
/**
* 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: The #GstElementFactory name of the element that changes
* the rate
* @property_name: The 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.
* Several properties may be registered for a single element type,
* provided they all contribute to the rate as independent factors. For
* example, this is true for the "GstPitch::rate" and "GstPitch::tempo"
* properties. These are already registered by default in GES, along with
* #videorate:rate for #videorate and #scaletempo:rate for #scaletempo.
*
* If such a rate property becomes a child property of a #GESEffect upon
* its creation (the element is part of its #GESEffect:bin-description),
* it will be automatically registered as a time property (see
* ges_base_effect_register_time_property()) and will have its time
* translation functions set (see
* ges_base_effect_set_time_translation_funcs()) to use the overall rate
* of the rate properties. Note that if an effect contains a rate
* property as well as a non-rate time property, you should ensure to set
* the time translation functions to some other methods using
* ges_base_effect_set_time_translation_funcs().
*
* Note, you can obtain a reference to the GESEffectClass using
*
* ```
* GES_EFFECT_CLASS (g_type_class_ref (GES_TYPE_EFFECT));
* ```
*
* Returns: %TRUE if the rate property was successfully 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;
}