gstreamer/ges/ges-auto-transition.c
2013-04-23 20:22:31 -03:00

182 lines
6.2 KiB
C

/* -*- Mode: C; indent-tabs-mode: nil; c-basic-offset: 2; tab-width: 2 -*- */
/*
* gst-editing-services
* Copyright (C) 2013 Thibault Saunier <thibault.saunier@collabora.com>
*
* gst-editing-services is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* gst-editing-services 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.";
*/
/* This class warps a GESBaseTransitionClip, letting any implementation
* of a GESBaseTransitionClip to be used.
*
* NOTE: This is for internal use exclusively
*/
#include "ges-auto-transition.h"
#include "ges-internal.h"
enum
{
DESTROY_ME,
LAST_SIGNAL
};
static guint auto_transition_signals[LAST_SIGNAL] = { 0 };
G_DEFINE_TYPE (GESAutoTransition, ges_auto_transition, G_TYPE_OBJECT);
static void
neighbour_changed_cb (GESClip * clip, GParamSpec * arg G_GNUC_UNUSED,
GESAutoTransition * self)
{
gint64 new_duration;
if (_PRIORITY (self->next_source) / LAYER_HEIGHT !=
_PRIORITY (self->previous_source) / LAYER_HEIGHT) {
GST_DEBUG_OBJECT (self, "Destroy changed layer");
g_signal_emit (self, auto_transition_signals[DESTROY_ME], 0);
return;
}
new_duration =
(_START (self->previous_source) +
_DURATION (self->previous_source)) - _START (self->next_source);
if (new_duration <= 0 || new_duration >= _DURATION (self->previous_source)
|| new_duration >= _DURATION (self->next_source)) {
GST_DEBUG_OBJECT (self, "Destroy %" G_GINT64_FORMAT " not a valid duration",
new_duration);
g_signal_emit (self, auto_transition_signals[DESTROY_ME], 0);
return;
}
_set_start0 (GES_TIMELINE_ELEMENT (self->transition_clip),
_START (self->next_source));
_set_duration0 (GES_TIMELINE_ELEMENT (self->transition_clip), new_duration);
}
static void
_height_changed_cb (GESClip * clip, GParamSpec * arg G_GNUC_UNUSED,
GESAutoTransition * self)
{
/* FIXME This is really not smart and we should properly implement clip
* priority management at the Layer level */
_set_priority0 (GES_TIMELINE_ELEMENT (self->next_clip),
_PRIORITY (self->previous_clip) +
GES_CONTAINER_HEIGHT (self->previous_clip));
}
static void
_track_changed_cb (GESTrackElement * track_element,
GParamSpec * arg G_GNUC_UNUSED, GESAutoTransition * self)
{
if (ges_track_element_get_track (track_element) == NULL) {
GST_DEBUG_OBJECT (self, "Neighboor %" GST_PTR_FORMAT
" removed from track ... auto destructing", track_element);
g_signal_emit (self, auto_transition_signals[DESTROY_ME], 0);
}
}
static void
ges_auto_transition_init (GESAutoTransition * ges_auto_transition)
{
}
static void
ges_auto_transition_finalize (GObject * object)
{
GESAutoTransition *self = GES_AUTO_TRANSITION (object);
g_signal_handlers_disconnect_by_func (self->previous_source,
neighbour_changed_cb, self);
g_signal_handlers_disconnect_by_func (self->next_source, neighbour_changed_cb,
self);
g_signal_handlers_disconnect_by_func (self->previous_clip,
_height_changed_cb, self);
g_signal_handlers_disconnect_by_func (self->next_source, _track_changed_cb,
self);
g_signal_handlers_disconnect_by_func (self->previous_source,
_track_changed_cb, self);
g_free (self->key);
G_OBJECT_CLASS (ges_auto_transition_parent_class)->finalize (object);
}
static void
ges_auto_transition_class_init (GESAutoTransitionClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
auto_transition_signals[DESTROY_ME] =
g_signal_new ("destroy-me", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST | G_SIGNAL_NO_RECURSE, 0, NULL, NULL, NULL,
G_TYPE_NONE, 0);
object_class->finalize = ges_auto_transition_finalize;
}
GESAutoTransition *
ges_auto_transition_new (GESTrackElement * transition,
GESTrackElement * previous_source, GESTrackElement * next_source)
{
GESAutoTransition *self = g_object_new (GES_TYPE_AUTO_TRANSITION, NULL);
self->previous_source = previous_source;
self->next_source = next_source;
self->transition = transition;
self->previous_clip =
GES_CLIP (GES_TIMELINE_ELEMENT_PARENT (previous_source));
self->next_clip = GES_CLIP (GES_TIMELINE_ELEMENT_PARENT (next_source));
self->transition_clip = GES_CLIP (GES_TIMELINE_ELEMENT_PARENT (transition));
g_signal_connect (previous_source, "notify::start",
G_CALLBACK (neighbour_changed_cb), self);
g_signal_connect (previous_source, "notify::priority",
G_CALLBACK (neighbour_changed_cb), self);
g_signal_connect (next_source, "notify::start",
G_CALLBACK (neighbour_changed_cb), self);
g_signal_connect (next_source, "notify::priority",
G_CALLBACK (neighbour_changed_cb), self);
g_signal_connect (previous_source, "notify::duration",
G_CALLBACK (neighbour_changed_cb), self);
g_signal_connect (next_source, "notify::duration",
G_CALLBACK (neighbour_changed_cb), self);
g_signal_connect (self->previous_clip, "notify::height",
G_CALLBACK (_height_changed_cb), self);
g_signal_connect (next_source, "notify::track",
G_CALLBACK (_track_changed_cb), self);
g_signal_connect (previous_source, "notify::track",
G_CALLBACK (_track_changed_cb), self);
_height_changed_cb (self->previous_clip, NULL, self);
GST_DEBUG_OBJECT (self, "Created transition %" GST_PTR_FORMAT
" between %" GST_PTR_FORMAT " and: %" GST_PTR_FORMAT
" in layer nb %i, start: %" GST_TIME_FORMAT " duration: %"
GST_TIME_FORMAT, transition, next_source, previous_source,
ges_layer_get_priority (ges_clip_get_layer
(self->previous_clip)),
GST_TIME_ARGS (_START (transition)),
GST_TIME_ARGS (_DURATION (transition)));
self->key = g_strdup_printf ("%p%p", self->previous_source,
self->next_source);
return self;
}