gstreamer/ges/ges-transition-clip.c

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/* GStreamer Editing Services
* Copyright (C) 2009 Edward Hervey <edward.hervey@collabora.co.uk>
* 2009 Nokia Corporation
*
* 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
2012-11-04 00:25:20 +00:00
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION: ges-transition-clip
* @short_description: Transition from one clip to another in a
* #GESTimelineLayer
*
* Creates an object that mixes together the two underlying objects, A and B.
* The A object is assumed to have a higher prioirity (lower number) than the
* B object. At the transition in point, only A will be visible, and by the
* end only B will be visible.
*
* The shape of the video transition depends on the value of the "vtype"
* property. The default value is "crossfade". For audio, only "crossfade" is
* supported.
*
* #GESSimpleTimelineLayer will automatically manage the priorities of sources
* and transitions. If you use #GESTransitionClips in another type of
* #GESTimelineLayer, you will need to manage priorities yourself.
*
* The ID of the ExtractableType is the nickname of the vtype property value. Note
* that this value can be changed after creation and the GESExtractable.asset value
* will be updated when needed.
*/
#include <ges/ges.h>
#include "ges-internal.h"
struct _GESTransitionClipPrivate
{
GSList *video_transitions;
const gchar *vtype_name;
};
enum
{
PROP_VTYPE = 5,
};
static GESTrackElement *ges_tl_transition_create_track_element (GESClip
* self, GESTrackType type);
static void
ges_transition_clip_track_element_added (GESClip * obj,
GESTrackElement * trackelement);
static void ges_transition_clip_track_element_released (GESClip * obj,
GESTrackElement * trackelement);
/* Internal methods */
static void
ges_transition_clip_update_vtype_internal (GESClip *
self, GESVideoStandardTransitionType value, gboolean set_asset)
{
GSList *tmp;
guint index;
GEnumClass *enum_class;
const gchar *asset_id = NULL;
GESTransitionClip *trself = GES_TRANSITION_CLIP (self);
enum_class = g_type_class_peek (GES_VIDEO_STANDARD_TRANSITION_TYPE_TYPE);
for (index = 0; index < enum_class->n_values; index++) {
if (enum_class->values[index].value == value) {
asset_id = enum_class->values[index].value_nick;
break;
}
}
if (asset_id == NULL) {
GST_WARNING_OBJECT (self, "Wrong transition type value: %i can not set it",
value);
return;
}
for (tmp = trself->priv->video_transitions; tmp; tmp = tmp->next) {
if (!ges_video_transition_set_transition_type
(GES_VIDEO_TRANSITION (tmp->data), value))
return;
}
trself->vtype = value;
trself->priv->vtype_name = asset_id;
if (set_asset) {
/* We already checked the value, so we can be sure no error will accured */
ges_extractable_set_asset (GES_EXTRACTABLE (self),
ges_asset_request (GES_TYPE_TRANSITION_CLIP, asset_id, NULL));
}
}
/* GESExtractable interface overrides */
static GParameter *
extractable_get_parameters_from_id (const gchar * id, guint * n_params)
{
GEnumClass *enum_class =
g_type_class_peek (GES_VIDEO_STANDARD_TRANSITION_TYPE_TYPE);
GParameter *params = g_new0 (GParameter, 1);
GEnumValue *value = g_enum_get_value_by_nick (enum_class, id);
params[0].name = "vtype";
g_value_init (&params[0].value, GES_VIDEO_STANDARD_TRANSITION_TYPE_TYPE);
g_value_set_enum (&params[0].value, value->value);
*n_params = 1;
return params;
}
static gchar *
extractable_check_id (GType type, const gchar * id)
{
guint index;
GEnumClass *enum_class;
enum_class = g_type_class_peek (GES_VIDEO_STANDARD_TRANSITION_TYPE_TYPE);
for (index = 0; index < enum_class->n_values; index++) {
if (g_strcmp0 (enum_class->values[index].value_nick, id) == 0)
return g_strdup (id);
}
return NULL;
}
static gchar *
extractable_get_id (GESExtractable * self)
{
guint index;
GEnumClass *enum_class;
guint value = GES_TRANSITION_CLIP (self)->vtype;
enum_class = g_type_class_peek (GES_VIDEO_STANDARD_TRANSITION_TYPE_TYPE);
for (index = 0; index < enum_class->n_values; index++) {
if (enum_class->values[index].value == value)
return g_strdup (enum_class->values[index].value_nick);
}
return NULL;
}
static void
extractable_set_asset (GESExtractable * self, GESAsset * asset)
{
GEnumClass *enum_class;
GESVideoStandardTransitionType value;
GESTransitionClip *trans = GES_TRANSITION_CLIP (self);
const gchar *vtype = ges_asset_get_id (asset);
/* Update the transition type if we actually changed it */
if (g_strcmp0 (vtype, trans->priv->vtype_name)) {
guint index;
value = GES_VIDEO_STANDARD_TRANSITION_TYPE_CROSSFADE;
enum_class = g_type_class_peek (GES_VIDEO_STANDARD_TRANSITION_TYPE_TYPE);
/* Find the in value in use */
for (index = 0; index < enum_class->n_values; index++) {
if (g_strcmp0 (enum_class->values[index].value_nick, vtype) == 0) {
value = enum_class->values[index].value;
break;
}
}
ges_transition_clip_update_vtype_internal (GES_CLIP (self), value, FALSE);
}
}
static void
ges_extractable_interface_init (GESExtractableInterface * iface)
{
iface->check_id = (GESExtractableCheckId) extractable_check_id;
iface->get_id = extractable_get_id;
iface->get_parameters_from_id = extractable_get_parameters_from_id;
iface->can_update_asset = TRUE;
iface->set_asset = extractable_set_asset;
}
G_DEFINE_TYPE_WITH_CODE (GESTransitionClip,
ges_transition_clip, GES_TYPE_BASE_TRANSITION_CLIP,
G_IMPLEMENT_INTERFACE (GES_TYPE_EXTRACTABLE,
ges_extractable_interface_init));
static void
ges_transition_clip_get_property (GObject * object,
guint property_id, GValue * value, GParamSpec * pspec)
{
GESTransitionClip *self = GES_TRANSITION_CLIP (object);
switch (property_id) {
case PROP_VTYPE:
g_value_set_enum (value, self->vtype);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ges_transition_clip_set_property (GObject * object,
guint property_id, const GValue * value, GParamSpec * pspec)
{
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GESClip *self = GES_CLIP (object);
switch (property_id) {
case PROP_VTYPE:
ges_transition_clip_update_vtype_internal (self,
g_value_get_enum (value), TRUE);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ges_transition_clip_class_init (GESTransitionClipClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GESClipClass *timobj_class = GES_CLIP_CLASS (klass);
g_type_class_add_private (klass, sizeof (GESTransitionClipPrivate));
object_class->get_property = ges_transition_clip_get_property;
object_class->set_property = ges_transition_clip_set_property;
/**
* GESTransitionClip:vtype:
*
* a #GESVideoStandardTransitionType representing the wipe to use
*/
g_object_class_install_property (object_class, PROP_VTYPE,
g_param_spec_enum ("vtype", "VType",
"The SMPTE video wipe to use, or 0 for crossfade",
GES_VIDEO_STANDARD_TRANSITION_TYPE_TYPE,
GES_VIDEO_STANDARD_TRANSITION_TYPE_CROSSFADE,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
timobj_class->create_track_element = ges_tl_transition_create_track_element;
timobj_class->need_fill_track = FALSE;
timobj_class->track_element_added = ges_transition_clip_track_element_added;
timobj_class->track_element_released =
ges_transition_clip_track_element_released;
}
static void
ges_transition_clip_init (GESTransitionClip * self)
{
self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
GES_TYPE_TRANSITION_CLIP, GESTransitionClipPrivate);
self->vtype = GES_VIDEO_STANDARD_TRANSITION_TYPE_NONE;
self->priv->vtype_name = NULL;
}
static void
ges_transition_clip_track_element_released (GESClip * obj,
GESTrackElement * trackelement)
{
GESTransitionClipPrivate *priv = GES_TRANSITION_CLIP (obj)->priv;
/* If this is called, we should be sure the trackelement exists */
if (GES_IS_VIDEO_TRANSITION (trackelement)) {
GST_DEBUG ("GESVideoTransition %p released from %p", trackelement, obj);
priv->video_transitions =
g_slist_remove (priv->video_transitions, trackelement);
g_object_unref (trackelement);
}
}
static void
ges_transition_clip_track_element_added (GESClip * obj,
GESTrackElement * trackelement)
{
GESTransitionClipPrivate *priv = GES_TRANSITION_CLIP (obj)->priv;
if (GES_IS_VIDEO_TRANSITION (trackelement)) {
GST_DEBUG ("GESVideoTransition %p added to %p", trackelement, obj);
priv->video_transitions =
g_slist_prepend (priv->video_transitions, g_object_ref (trackelement));
}
}
static GESTrackElement *
ges_tl_transition_create_track_element (GESClip * obj, GESTrackType type)
{
GESTransitionClip *transition = (GESTransitionClip *) obj;
GESTrackElement *res = NULL;
GESTrackType supportedformats;
GST_DEBUG ("Creating a GESTransition");
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supportedformats = ges_clip_get_supported_formats (obj);
if (type == GES_TRACK_TYPE_VIDEO) {
if (supportedformats == GES_TRACK_TYPE_UNKNOWN ||
supportedformats & GES_TRACK_TYPE_VIDEO) {
GESVideoTransition *trans;
trans = ges_video_transition_new ();
ges_video_transition_set_transition_type (trans, transition->vtype);
res = GES_TRACK_ELEMENT (trans);
} else {
GST_DEBUG ("Not creating transition as video track not on"
" supportedformats");
}
} else if (type == GES_TRACK_TYPE_AUDIO) {
if (supportedformats == GES_TRACK_TYPE_UNKNOWN ||
supportedformats & GES_TRACK_TYPE_AUDIO)
res = GES_TRACK_ELEMENT (ges_audio_transition_new ());
else
GST_DEBUG ("Not creating transition as audio track"
" not on supportedformats");
} else
GST_WARNING ("Transitions don't handle this track type");
return res;
}
/**
* ges_transition_clip_new:
* @vtype: the type of transition to create
*
* Creates a new #GESTransitionClip.
*
* Returns: a newly created #GESTransitionClip, or %NULL if something
* went wrong.
*/
GESTransitionClip *
ges_transition_clip_new (GESVideoStandardTransitionType vtype)
{
return g_object_new (GES_TYPE_TRANSITION_CLIP, "vtype", (gint) vtype, NULL);
}
/**
* ges_transition_clip_new_for_nick:
* @nick: a string representing the type of transition to create
*
* Creates a new #GESTransitionClip for the provided @nick.
*
* Returns: The newly created #GESTransitionClip, or %NULL if something
* went wrong
*/
GESTransitionClip *
ges_transition_clip_new_for_nick (gchar * nick)
{
GEnumValue *value;
GEnumClass *klass;
GESTransitionClip *ret = NULL;
klass =
G_ENUM_CLASS (g_type_class_ref (GES_VIDEO_STANDARD_TRANSITION_TYPE_TYPE));
if (!klass)
return NULL;
value = g_enum_get_value_by_nick (klass, nick);
if (value) {
ret = g_object_new (GES_TYPE_TRANSITION_CLIP, "vtype",
(gint) value->value, NULL);
}
g_type_class_unref (klass);
return ret;
}