gstreamer/ges/ges-auto-transition.c
Henry Wilkes 0a3da79e97 clip: preserve auto-transition in split
When splitting a clip, keep the auto-transition at the end of the clip
alive and move its source to that of the corresponding split track
element.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/169>
2020-05-07 09:37:15 +01:00

213 lines
6.7 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
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#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 (G_GNUC_UNUSED GObject * object,
G_GNUC_UNUSED GParamSpec * arg, GESAutoTransition * self)
{
gint64 new_duration;
guint32 layer_prio;
GESLayer *layer;
GESTimeline *timeline;
if (self->frozen) {
GST_LOG_OBJECT (self, "Not updating because frozen");
return;
}
if (self->positioning) {
/* this can happen when the transition is moved layers as the layer
* may resync its priorities */
GST_LOG_OBJECT (self, "Not updating because positioning");
return;
}
layer_prio = GES_TIMELINE_ELEMENT_LAYER_PRIORITY (self->next_source);
if (layer_prio != GES_TIMELINE_ELEMENT_LAYER_PRIORITY (self->previous_source)) {
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;
}
timeline = GES_TIMELINE_ELEMENT_TIMELINE (self->transition_clip);
layer = timeline ? ges_timeline_get_layer (timeline, layer_prio) : NULL;
if (!layer) {
GST_DEBUG_OBJECT (self, "Destroy no layer");
g_signal_emit (self, auto_transition_signals[DESTROY_ME], 0);
return;
}
self->positioning = TRUE;
GES_TIMELINE_ELEMENT_SET_BEING_EDITED (self->transition_clip);
_set_start0 (GES_TIMELINE_ELEMENT (self->transition_clip),
_START (self->next_source));
_set_duration0 (GES_TIMELINE_ELEMENT (self->transition_clip), new_duration);
ges_clip_move_to_layer (self->transition_clip, layer);
GES_TIMELINE_ELEMENT_UNSET_BEING_EDITED (self->transition_clip);
self->positioning = FALSE;
gst_object_unref (layer);
}
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
_connect_to_source (GESAutoTransition * self, GESTrackElement * source)
{
g_signal_connect (source, "notify::start",
G_CALLBACK (neighbour_changed_cb), self);
g_signal_connect_after (source, "notify::priority",
G_CALLBACK (neighbour_changed_cb), self);
g_signal_connect (source, "notify::duration",
G_CALLBACK (neighbour_changed_cb), self);
g_signal_connect (source, "notify::track",
G_CALLBACK (_track_changed_cb), self);
}
static void
_disconnect_from_source (GESAutoTransition * self, GESTrackElement * source)
{
g_signal_handlers_disconnect_by_func (source, neighbour_changed_cb, self);
g_signal_handlers_disconnect_by_func (source, _track_changed_cb, self);
}
void
ges_auto_transition_set_previous_source (GESAutoTransition * self,
GESTrackElement * source)
{
_disconnect_from_source (self, self->previous_source);
_connect_to_source (self, source);
self->previous_source = source;
}
static void
ges_auto_transition_init (GESAutoTransition * ges_auto_transition)
{
}
static void
ges_auto_transition_finalize (GObject * object)
{
GESAutoTransition *self = GES_AUTO_TRANSITION (object);
_disconnect_from_source (self, self->previous_source);
_disconnect_from_source (self, self->next_source);
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->frozen = FALSE;
self->previous_source = previous_source;
self->next_source = next_source;
self->transition = transition;
self->transition_clip = GES_CLIP (GES_TIMELINE_ELEMENT_PARENT (transition));
_connect_to_source (self, previous_source);
_connect_to_source (self, next_source);
GST_DEBUG_OBJECT (self, "Created transition %" GST_PTR_FORMAT
" between %" GST_PTR_FORMAT "[%" GST_TIME_FORMAT
" - %" GST_TIME_FORMAT "] and: %" GST_PTR_FORMAT
"[%" GST_TIME_FORMAT " - %" GST_TIME_FORMAT "]"
" in layer nb %" G_GUINT32_FORMAT ", start: %" GST_TIME_FORMAT
" duration: %" GST_TIME_FORMAT, transition, previous_source,
GST_TIME_ARGS (_START (previous_source)),
GST_TIME_ARGS (_END (previous_source)),
next_source,
GST_TIME_ARGS (_START (next_source)),
GST_TIME_ARGS (_END (next_source)),
GES_TIMELINE_ELEMENT_LAYER_PRIORITY (next_source),
GST_TIME_ARGS (_START (transition)),
GST_TIME_ARGS (_DURATION (transition)));
return self;
}
void
ges_auto_transition_update (GESAutoTransition * self)
{
GST_INFO ("Updating info %s",
GES_TIMELINE_ELEMENT_NAME (self->transition_clip));
neighbour_changed_cb (NULL, NULL, self);
}