ges/ges-auto-transition.c

   1 /* -*- Mode: C; indent-tabs-mode: nil; c-basic-offset: 2; tab-width: 2 -*-  */
   2 /*
   3  * gst-editing-services
   4  * Copyright (C) 2013 Thibault Saunier <thibault.saunier@collabora.com>
   5  *
   6  * gst-editing-services is free software: you can redistribute it and/or modify it
   7  * under the terms of the GNU Lesser General Public License as published
   8  * by the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * gst-editing-services is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  14  * See the GNU Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.";
  18  */
  19
  20 /* This class warps a GESBaseTransitionClip, letting any implementation
  21  * of a GESBaseTransitionClip to be used.
  22  *
  23  * NOTE: This is for internal use exclusively
  24  */
  25 #ifdef HAVE_CONFIG_H
  26 #include "config.h"
  27 #endif
  28
  29 #include "ges-auto-transition.h"
  30 #include "ges-internal.h"
  31 enum
  32 {
  33   DESTROY_ME,
  34   LAST_SIGNAL
  35 };
  36
  37 static guint auto_transition_signals[LAST_SIGNAL] = { 0 };
  38
  39 G_DEFINE_TYPE (GESAutoTransition, ges_auto_transition, G_TYPE_OBJECT);
  40
  41 static void
  42 neighbour_changed_cb (GESClip * clip, GParamSpec * arg G_GNUC_UNUSED,
  43     GESAutoTransition * self)
  44 {
  45   gint64 new_duration;
  46   GESTimelineElement *parent =
  47       ges_timeline_element_get_toplevel_parent (GES_TIMELINE_ELEMENT (clip));
  48
  49   if (parent) {
  50     GESTimelineElement *prev_topparent =
  51         ges_timeline_element_get_toplevel_parent (GES_TIMELINE_ELEMENT
  52         (self->next_source));
  53     GESTimelineElement *next_topparent =
  54         ges_timeline_element_get_toplevel_parent (GES_TIMELINE_ELEMENT
  55         (self->previous_source));
  56
  57     if (parent == prev_topparent && parent == next_topparent) {
  58       GST_DEBUG_OBJECT (self,
  59           "Moving all inside the same group, nothing to do");
  60       return;
  61     }
  62   }
  63
  64   if (GES_TIMELINE_ELEMENT_LAYER_PRIORITY (self->next_source) !=
  65       GES_TIMELINE_ELEMENT_LAYER_PRIORITY (self->previous_source)) {
  66     GST_DEBUG_OBJECT (self, "Destroy changed layer");
  67     g_signal_emit (self, auto_transition_signals[DESTROY_ME], 0);
  68     return;
  69   }
  70
  71   new_duration =
  72       (_START (self->previous_source) +
  73       _DURATION (self->previous_source)) - _START (self->next_source);
  74
  75   if (new_duration <= 0 || new_duration >= _DURATION (self->previous_source)
  76       || new_duration >= _DURATION (self->next_source)) {
  77
  78     GST_DEBUG_OBJECT (self, "Destroy %" G_GINT64_FORMAT " not a valid duration",
  79         new_duration);
  80     g_signal_emit (self, auto_transition_signals[DESTROY_ME], 0);
  81     return;
  82   }
  83
  84   self->positioning = TRUE;
  85   _set_start0 (GES_TIMELINE_ELEMENT (self->transition_clip),
  86       _START (self->next_source));
  87   _set_duration0 (GES_TIMELINE_ELEMENT (self->transition_clip), new_duration);
  88   self->positioning = FALSE;
  89 }
  90
  91 static void
  92 _track_changed_cb (GESTrackElement * track_element,
  93     GParamSpec * arg G_GNUC_UNUSED, GESAutoTransition * self)
  94 {
  95   if (ges_track_element_get_track (track_element) == NULL) {
  96     GST_DEBUG_OBJECT (self, "Neighboor %" GST_PTR_FORMAT
  97         " removed from track ... auto destructing", track_element);
  98
  99     g_signal_emit (self, auto_transition_signals[DESTROY_ME], 0);
 100   }
 101
 102 }
 103
 104 static void
 105 ges_auto_transition_init (GESAutoTransition * ges_auto_transition)
 106 {
 107 }
 108
 109 static void
 110 ges_auto_transition_finalize (GObject * object)
 111 {
 112   GESAutoTransition *self = GES_AUTO_TRANSITION (object);
 113
 114   g_signal_handlers_disconnect_by_func (self->previous_source,
 115       neighbour_changed_cb, self);
 116   g_signal_handlers_disconnect_by_func (self->next_source, neighbour_changed_cb,
 117       self);
 118   g_signal_handlers_disconnect_by_func (self->next_source, _track_changed_cb,
 119       self);
 120   g_signal_handlers_disconnect_by_func (self->previous_source,
 121       _track_changed_cb, self);
 122
 123   g_free (self->key);
 124
 125   G_OBJECT_CLASS (ges_auto_transition_parent_class)->finalize (object);
 126 }
 127
 128 static void
 129 ges_auto_transition_class_init (GESAutoTransitionClass * klass)
 130 {
 131   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 132
 133   auto_transition_signals[DESTROY_ME] =
 134       g_signal_new ("destroy-me", G_TYPE_FROM_CLASS (klass),
 135       G_SIGNAL_RUN_FIRST | G_SIGNAL_NO_RECURSE, 0, NULL, NULL, NULL,
 136       G_TYPE_NONE, 0);
 137   object_class->finalize = ges_auto_transition_finalize;
 138 }
 139
 140
 141 GESAutoTransition *
 142 ges_auto_transition_new (GESTrackElement * transition,
 143     GESTrackElement * previous_source, GESTrackElement * next_source)
 144 {
 145   GESAutoTransition *self = g_object_new (GES_TYPE_AUTO_TRANSITION, NULL);
 146
 147   self->previous_source = previous_source;
 148   self->next_source = next_source;
 149   self->transition = transition;
 150
 151   self->previous_clip =
 152       GES_CLIP (GES_TIMELINE_ELEMENT_PARENT (previous_source));
 153   self->next_clip = GES_CLIP (GES_TIMELINE_ELEMENT_PARENT (next_source));
 154   self->transition_clip = GES_CLIP (GES_TIMELINE_ELEMENT_PARENT (transition));
 155
 156   g_signal_connect (previous_source, "notify::start",
 157       G_CALLBACK (neighbour_changed_cb), self);
 158   g_signal_connect_after (previous_source, "notify::priority",
 159       G_CALLBACK (neighbour_changed_cb), self);
 160   g_signal_connect (next_source, "notify::start",
 161       G_CALLBACK (neighbour_changed_cb), self);
 162   g_signal_connect (next_source, "notify::priority",
 163       G_CALLBACK (neighbour_changed_cb), self);
 164   g_signal_connect (previous_source, "notify::duration",
 165       G_CALLBACK (neighbour_changed_cb), self);
 166   g_signal_connect (next_source, "notify::duration",
 167       G_CALLBACK (neighbour_changed_cb), self);
 168
 169   g_signal_connect (next_source, "notify::track",
 170       G_CALLBACK (_track_changed_cb), self);
 171   g_signal_connect (previous_source, "notify::track",
 172       G_CALLBACK (_track_changed_cb), self);
 173
 174   GST_DEBUG_OBJECT (self, "Created transition %" GST_PTR_FORMAT
 175       " between %" GST_PTR_FORMAT "[%" GST_TIME_FORMAT
 176       " - %" GST_TIME_FORMAT "] and: %" GST_PTR_FORMAT
 177       "[%" GST_TIME_FORMAT " - %" GST_TIME_FORMAT "]"
 178       " in layer nb %i, start: %" GST_TIME_FORMAT " duration: %"
 179       GST_TIME_FORMAT, transition, previous_source,
 180       GST_TIME_ARGS (_START (previous_source)),
 181       GST_TIME_ARGS (_END (previous_source)),
 182       next_source,
 183       GST_TIME_ARGS (_START (next_source)),
 184       GST_TIME_ARGS (_END (next_source)),
 185       ges_layer_get_priority (ges_clip_get_layer
 186           (self->previous_clip)),
 187       GST_TIME_ARGS (_START (transition)),
 188       GST_TIME_ARGS (_DURATION (transition)));
 189
 190   self->key = g_strdup_printf ("%p%p", self->previous_source,
 191       self->next_source);
 192
 193   return self;
 194 }