File: ges-layer.c

package info (click to toggle)
gstreamer-editing-services1.0 1.14.4-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster
  • size: 8,388 kB
  • sloc: ansic: 43,396; sh: 4,773; perl: 1,583; makefile: 1,172; python: 581; xml: 80; lex: 44
file content (784 lines) | stat: -rw-r--r-- 22,221 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
/* GStreamer Editing Services
 * Copyright (C) 2009 Edward Hervey <edward.hervey@collabora.co.uk>
 *               2009 Nokia Corporation
 *               2011 Mathieu Duponchelle <mathieu.duponchelle@epitech.eu>
 *               2013 Thibault Saunier <thibault.saunier@collabora.com>
 *
 * 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:geslayer
 * @title: GESLayer
 * @short_description: Non-overlapping sequence of GESClip
 *
 * Responsible for the ordering of the various contained Clip(s). A
 * timeline layer has a "priority" property, which is used to manage the
 * priorities of individual Clips. Two layers should not have the
 * same priority within a given timeline.
 */

#include "ges-internal.h"
#include "ges-layer.h"
#include "ges.h"
#include "ges-source-clip.h"

static void ges_meta_container_interface_init
    (GESMetaContainerInterface * iface);

G_DEFINE_TYPE_WITH_CODE (GESLayer, ges_layer,
    G_TYPE_INITIALLY_UNOWNED, G_IMPLEMENT_INTERFACE (GES_TYPE_EXTRACTABLE, NULL)
    G_IMPLEMENT_INTERFACE (GES_TYPE_META_CONTAINER,
        ges_meta_container_interface_init));

struct _GESLayerPrivate
{
  /*< private > */
  GList *clips_start;           /* The Clips sorted by start and
                                 * priority */

  guint32 priority;             /* The priority of the layer within the
                                 * containing timeline */
  gboolean auto_transition;
};

typedef struct
{
  GESClip *clip;
  GESLayer *layer;
} NewAssetUData;

enum
{
  PROP_0,
  PROP_PRIORITY,
  PROP_AUTO_TRANSITION,
  PROP_LAST
};

enum
{
  OBJECT_ADDED,
  OBJECT_REMOVED,
  LAST_SIGNAL
};

static guint ges_layer_signals[LAST_SIGNAL] = { 0 };

/* GObject standard vmethods */
static void
ges_layer_get_property (GObject * object, guint property_id,
    GValue * value, GParamSpec * pspec)
{
  GESLayer *layer = GES_LAYER (object);

  switch (property_id) {
    case PROP_PRIORITY:
      g_value_set_uint (value, layer->priv->priority);
      break;
    case PROP_AUTO_TRANSITION:
      g_value_set_boolean (value, layer->priv->auto_transition);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
  }
}

static void
ges_layer_set_property (GObject * object, guint property_id,
    const GValue * value, GParamSpec * pspec)
{
  GESLayer *layer = GES_LAYER (object);

  switch (property_id) {
    case PROP_PRIORITY:
      ges_layer_set_priority (layer, g_value_get_uint (value));
      break;
    case PROP_AUTO_TRANSITION:
      ges_layer_set_auto_transition (layer, g_value_get_boolean (value));
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
  }
}

static void
ges_layer_dispose (GObject * object)
{
  GESLayer *layer = GES_LAYER (object);
  GESLayerPrivate *priv = layer->priv;

  GST_DEBUG ("Disposing layer");

  while (priv->clips_start)
    ges_layer_remove_clip (layer, (GESClip *) priv->clips_start->data);

  G_OBJECT_CLASS (ges_layer_parent_class)->dispose (object);
}

static gboolean
_register_metas (GESLayer * layer)
{
  ges_meta_container_register_meta_float (GES_META_CONTAINER (layer),
      GES_META_READ_WRITE, GES_META_VOLUME, 1.0);

  return TRUE;
}

static void
ges_meta_container_interface_init (GESMetaContainerInterface * iface)
{

}

static void
ges_layer_class_init (GESLayerClass * klass)
{
  GObjectClass *object_class = G_OBJECT_CLASS (klass);

  g_type_class_add_private (klass, sizeof (GESLayerPrivate));

  object_class->get_property = ges_layer_get_property;
  object_class->set_property = ges_layer_set_property;
  object_class->dispose = ges_layer_dispose;

  /**
   * GESLayer:priority:
   *
   * The priority of the layer in the #GESTimeline. 0 is the highest
   * priority. Conceptually, a #GESTimeline is a stack of GESLayers,
   * and the priority of the layer represents its position in the stack. Two
   * layers should not have the same priority within a given GESTimeline.
   *
   * Note that the timeline needs to be commited (with #ges_timeline_commit)
   * for the change to be taken into account.
   */
  g_object_class_install_property (object_class, PROP_PRIORITY,
      g_param_spec_uint ("priority", "Priority",
          "The priority of the layer", 0, G_MAXUINT, 0, G_PARAM_READWRITE));

  /**
   * GESLayer:auto-transition:
   *
   * Sets whether transitions are added automagically when clips overlap.
   */
  g_object_class_install_property (object_class, PROP_AUTO_TRANSITION,
      g_param_spec_boolean ("auto-transition", "Auto-Transition",
          "whether the transitions are added", FALSE, G_PARAM_READWRITE));

  /**
   * GESLayer::clip-added:
   * @layer: the #GESLayer
   * @clip: the #GESClip that was added.
   *
   * Will be emitted after the clip was added to the layer.
   */
  ges_layer_signals[OBJECT_ADDED] =
      g_signal_new ("clip-added", G_TYPE_FROM_CLASS (klass),
      G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (GESLayerClass, object_added),
      NULL, NULL, g_cclosure_marshal_generic, G_TYPE_NONE, 1, GES_TYPE_CLIP);

  /**
   * GESLayer::clip-removed:
   * @layer: the #GESLayer
   * @clip: the #GESClip that was removed
   *
   * Will be emitted after the clip was removed from the layer.
   */
  ges_layer_signals[OBJECT_REMOVED] =
      g_signal_new ("clip-removed", G_TYPE_FROM_CLASS (klass),
      G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (GESLayerClass,
          object_removed), NULL, NULL, g_cclosure_marshal_generic, G_TYPE_NONE,
      1, GES_TYPE_CLIP);
}

static void
ges_layer_init (GESLayer * self)
{
  self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
      GES_TYPE_LAYER, GESLayerPrivate);

  self->priv->priority = 0;
  self->priv->auto_transition = FALSE;
  self->min_nle_priority = MIN_NLE_PRIO;
  self->max_nle_priority = LAYER_HEIGHT + MIN_NLE_PRIO;

  _register_metas (self);
}

static gint
ges_layer_resync_priorities_by_type (GESLayer * layer,
    gint starting_priority, GType type)
{
  GstClockTime next_reset = 0;
  gint priority = starting_priority, max_priority = priority;
  GList *tmp;
  GESTimelineElement *element;

  for (tmp = layer->priv->clips_start; tmp; tmp = tmp->next) {

    element = GES_TIMELINE_ELEMENT (tmp->data);

    if (GES_IS_TRANSITION_CLIP (element)) {
      /* Blindly set transitions priorities to 0 */
      _set_priority0 (element, 0);
      continue;
    } else if (!g_type_is_a (G_OBJECT_TYPE (element), type))
      continue;

    if (element->start > next_reset) {
      priority = starting_priority;
      next_reset = 0;
    }

    if (element->start + element->duration > next_reset)
      next_reset = element->start + element->duration;

    _set_priority0 (element, priority);
    priority = priority + GES_CONTAINER_HEIGHT (element);

    if (priority > max_priority)
      max_priority = priority;
  }

  return max_priority;
}

/**
 * ges_layer_resync_priorities:
 * @layer: a #GESLayer
 *
 * Resyncs the priorities of the clips controlled by @layer.
 */
gboolean
ges_layer_resync_priorities (GESLayer * layer)
{
  gint min_source_prios;

  g_return_val_if_fail (GES_IS_LAYER (layer), FALSE);

  GST_INFO_OBJECT (layer, "Resync priorities (prio: %d)",
      layer->priv->priority);

  min_source_prios = ges_layer_resync_priorities_by_type (layer, 1,
      GES_TYPE_OPERATION_CLIP);

  ges_layer_resync_priorities_by_type (layer, min_source_prios,
      GES_TYPE_SOURCE_CLIP);

  return TRUE;
}

static void
new_asset_cb (GESAsset * source, GAsyncResult * res, NewAssetUData * udata)
{
  GError *error = NULL;

  GESAsset *asset = ges_asset_request_finish (res, &error);

  GST_DEBUG_OBJECT (udata->layer, "%" GST_PTR_FORMAT " Asset loaded, "
      "setting its asset", udata->clip);

  if (error) {
    GESProject *project = udata->layer->timeline ?
        GES_PROJECT (ges_extractable_get_asset (GES_EXTRACTABLE
            (udata->layer->timeline))) : NULL;
    if (project) {
      gchar *possible_id;

      possible_id = ges_project_try_updating_id (project, source, error);
      if (possible_id) {
        ges_asset_request_async (ges_asset_get_extractable_type (source),
            possible_id, NULL, (GAsyncReadyCallback) new_asset_cb, udata);
        g_free (possible_id);
        return;
      }
    }

    GST_ERROR ("Asset could not be created for uri %s, error: %s",
        ges_asset_get_id (asset), error->message);
  } else {
    GESProject *project = udata->layer->timeline ?
        GES_PROJECT (ges_extractable_get_asset (GES_EXTRACTABLE
            (udata->layer->timeline))) : NULL;
    ges_extractable_set_asset (GES_EXTRACTABLE (udata->clip), asset);

    ges_project_add_asset (project, asset);

    /* clip was already ref-sinked when creating udata,
     * gst_layer_add_clip() creates a new ref as such and
     * below we unref the ref from udata */
    ges_layer_add_clip (udata->layer, udata->clip);
  }

  gst_object_unref (asset);
  gst_object_unref (udata->clip);
  g_slice_free (NewAssetUData, udata);
}

/**
 * ges_layer_get_duration:
 * @layer: The #GESLayer to get the duration from
 *
 * Lets you retrieve the duration of the layer, which means
 * the end time of the last clip inside it
 *
 * Returns: The duration of a layer
 */
GstClockTime
ges_layer_get_duration (GESLayer * layer)
{
  GList *tmp;
  GstClockTime duration = 0;

  g_return_val_if_fail (GES_IS_LAYER (layer), 0);

  for (tmp = layer->priv->clips_start; tmp; tmp = tmp->next) {
    duration = MAX (duration, _END (tmp->data));
  }

  return duration;
}

/* Public methods */
/**
 * ges_layer_remove_clip:
 * @layer: a #GESLayer
 * @clip: the #GESClip to remove
 *
 * Removes the given @clip from the @layer and unparents it.
 * Unparenting it means the reference owned by @layer on the @clip will be
 * removed. If you wish to use the @clip after this function, make sure you
 * call gst_object_ref() before removing it from the @layer.
 *
 * Returns: %TRUE if the clip could be removed, %FALSE if the layer does
 * not want to remove the clip.
 */
gboolean
ges_layer_remove_clip (GESLayer * layer, GESClip * clip)
{
  GESLayer *current_layer;

  g_return_val_if_fail (GES_IS_LAYER (layer), FALSE);
  g_return_val_if_fail (GES_IS_CLIP (clip), FALSE);

  GST_DEBUG ("layer:%p, clip:%p", layer, clip);

  current_layer = ges_clip_get_layer (clip);
  if (G_UNLIKELY (current_layer != layer)) {
    GST_WARNING ("Clip doesn't belong to this layer");

    if (current_layer != NULL)
      gst_object_unref (current_layer);

    return FALSE;
  }
  gst_object_unref (current_layer);

  /* Remove it from our list of controlled objects */
  layer->priv->clips_start = g_list_remove (layer->priv->clips_start, clip);

  /* emit 'clip-removed' */
  g_signal_emit (layer, ges_layer_signals[OBJECT_REMOVED], 0, clip);

  /* inform the clip it's no longer in a layer */
  ges_clip_set_layer (clip, NULL);
  /* so neither in a timeline */
  if (layer->timeline)
    ges_timeline_element_set_timeline (GES_TIMELINE_ELEMENT (clip), NULL);

  /* Remove our reference to the clip */
  gst_object_unref (clip);

  return TRUE;
}

/**
 * ges_layer_set_priority:
 * @layer: a #GESLayer
 * @priority: the priority to set
 *
 * Sets the layer to the given @priority. See the documentation of the
 * priority property for more information.
 */
void
ges_layer_set_priority (GESLayer * layer, guint priority)
{
  g_return_if_fail (GES_IS_LAYER (layer));

  GST_DEBUG ("layer:%p, priority:%d", layer, priority);

  if (priority != layer->priv->priority) {
    layer->priv->priority = priority;
    layer->min_nle_priority = (priority * LAYER_HEIGHT) + MIN_NLE_PRIO;
    layer->max_nle_priority = ((priority + 1) * LAYER_HEIGHT) + MIN_NLE_PRIO;

    ges_layer_resync_priorities (layer);
  }

  g_object_notify (G_OBJECT (layer), "priority");
}

/**
 * ges_layer_get_auto_transition:
 * @layer: a #GESLayer
 *
 * Gets whether transitions are automatically added when objects
 * overlap or not.
 *
 * Returns: %TRUE if transitions are automatically added, else %FALSE.
 */
gboolean
ges_layer_get_auto_transition (GESLayer * layer)
{
  g_return_val_if_fail (GES_IS_LAYER (layer), 0);

  return layer->priv->auto_transition;
}

/**
 * ges_layer_set_auto_transition:
 * @layer: a #GESLayer
 * @auto_transition: whether the auto_transition is active
 *
 * Sets the layer to the given @auto_transition. See the documentation of the
 * property auto_transition for more information.
 */
void
ges_layer_set_auto_transition (GESLayer * layer, gboolean auto_transition)
{

  g_return_if_fail (GES_IS_LAYER (layer));

  layer->priv->auto_transition = auto_transition;
  g_object_notify (G_OBJECT (layer), "auto-transition");
}

/**
 * ges_layer_get_priority:
 * @layer: a #GESLayer
 *
 * Get the priority of @layer within the timeline.
 *
 * Returns: The priority of the @layer within the timeline.
 */
guint
ges_layer_get_priority (GESLayer * layer)
{
  g_return_val_if_fail (GES_IS_LAYER (layer), 0);

  return layer->priv->priority;
}

/**
 * ges_layer_get_clips:
 * @layer: a #GESLayer
 *
 * Get the clips this layer contains.
 *
 * Returns: (transfer full) (element-type GESClip): a #GList of
 * clips. The user is responsible for
 * unreffing the contained objects and freeing the list.
 */

GList *
ges_layer_get_clips (GESLayer * layer)
{
  GESLayerClass *klass;

  g_return_val_if_fail (GES_IS_LAYER (layer), NULL);

  klass = GES_LAYER_GET_CLASS (layer);

  if (klass->get_objects) {
    return klass->get_objects (layer);
  }

  return g_list_sort (g_list_copy_deep (layer->priv->clips_start,
          (GCopyFunc) gst_object_ref, NULL),
      (GCompareFunc) element_start_compare);
}

/**
 * ges_layer_is_empty:
 * @layer: The #GESLayer to check
 *
 * Convenience method to check if @layer is empty (doesn't contain any clip),
 * or not.
 *
 * Returns: %TRUE if @layer is empty, %FALSE if it already contains at least
 * one #GESClip
 */
gboolean
ges_layer_is_empty (GESLayer * layer)
{
  g_return_val_if_fail (GES_IS_LAYER (layer), FALSE);

  return (layer->priv->clips_start == NULL);
}

/**
 * ges_layer_add_clip:
 * @layer: a #GESLayer
 * @clip: (transfer floating): the #GESClip to add.
 *
 * Adds the given clip to the layer. Sets the clip's parent, and thus
 * takes ownership of the clip.
 *
 * An clip can only be added to one layer.
 *
 * Calling this method will construct and properly set all the media related
 * elements on @clip. If you need to know when those objects (actually #GESTrackElement)
 * are constructed, you should connect to the container::child-added signal which
 * is emited right after those elements are ready to be used.
 *
 * Returns: %TRUE if the clip was properly added to the layer, or %FALSE
 * if the @layer refuses to add the clip.
 */
gboolean
ges_layer_add_clip (GESLayer * layer, GESClip * clip)
{
  GESAsset *asset;
  GESLayerPrivate *priv;
  GESLayer *current_layer;

  g_return_val_if_fail (GES_IS_LAYER (layer), FALSE);
  g_return_val_if_fail (GES_IS_CLIP (clip), FALSE);

  GST_DEBUG_OBJECT (layer, "adding clip:%p", clip);

  priv = layer->priv;
  current_layer = ges_clip_get_layer (clip);
  if (G_UNLIKELY (current_layer)) {
    GST_WARNING ("Clip %p already belongs to another layer", clip);
    gst_object_ref_sink (clip);
    gst_object_unref (current_layer);

    return FALSE;
  }

  asset = ges_extractable_get_asset (GES_EXTRACTABLE (clip));
  if (asset == NULL) {
    gchar *id;
    NewAssetUData *mudata = g_slice_new (NewAssetUData);

    mudata->clip = gst_object_ref_sink (clip);
    mudata->layer = layer;

    GST_DEBUG_OBJECT (layer, "%" GST_PTR_FORMAT " as no reference to any "
        "assets creating a asset... trying sync", clip);

    id = ges_extractable_get_id (GES_EXTRACTABLE (clip));
    asset = ges_asset_request (G_OBJECT_TYPE (clip), id, NULL);
    if (asset == NULL) {
      GESProject *project = layer->timeline ?
          GES_PROJECT (ges_extractable_get_asset (GES_EXTRACTABLE
              (layer->timeline))) : NULL;

      ges_asset_request_async (G_OBJECT_TYPE (clip),
          id, NULL, (GAsyncReadyCallback) new_asset_cb, mudata);

      if (project)
        ges_project_add_loading_asset (project, G_OBJECT_TYPE (clip), id);
      g_free (id);

      GST_LOG_OBJECT (layer, "Object added async");
      return TRUE;
    }
    g_free (id);

    ges_extractable_set_asset (GES_EXTRACTABLE (clip), asset);

    g_slice_free (NewAssetUData, mudata);
  } else {
    gst_object_ref_sink (clip);
  }

  /* Take a reference to the clip and store it stored by start/priority */
  priv->clips_start = g_list_insert_sorted (priv->clips_start, clip,
      (GCompareFunc) element_start_compare);

  /* Inform the clip it's now in this layer */
  ges_clip_set_layer (clip, layer);

  GST_DEBUG ("current clip priority : %d, Height: %d", _PRIORITY (clip),
      LAYER_HEIGHT);

  /* Set the priority. */
  if (_PRIORITY (clip) > LAYER_HEIGHT) {
    GST_WARNING_OBJECT (layer,
        "%p is out of the layer space, setting its priority to "
        "%d, setting it to the maximum priority of the layer: %d", clip,
        _PRIORITY (clip), LAYER_HEIGHT - 1);
    _set_priority0 (GES_TIMELINE_ELEMENT (clip), LAYER_HEIGHT - 1);
  }

  ges_layer_resync_priorities (layer);

  ges_timeline_element_set_timeline (GES_TIMELINE_ELEMENT (clip),
      layer->timeline);

  /* emit 'clip-added' */
  g_signal_emit (layer, ges_layer_signals[OBJECT_ADDED], 0, clip);

  return TRUE;
}

/**
 * ges_layer_add_asset:
 * @layer: a #GESLayer
 * @asset: The asset to add to
 * @start: The start value to set on the new #GESClip,
 * if @start == GST_CLOCK_TIME_NONE, it will be set to
 * the current duration of @layer
 * @inpoint: The inpoint value to set on the new #GESClip
 * @duration: The duration value to set on the new #GESClip
 * @track_types: The #GESTrackType to set on the the new #GESClip
 *
 * Creates Clip from asset, adds it to layer and
 * returns a reference to it.
 *
 * Returns: (transfer none): Created #GESClip
 */
GESClip *
ges_layer_add_asset (GESLayer * layer,
    GESAsset * asset, GstClockTime start, GstClockTime inpoint,
    GstClockTime duration, GESTrackType track_types)
{
  GESClip *clip;

  g_return_val_if_fail (GES_IS_LAYER (layer), NULL);
  g_return_val_if_fail (GES_IS_ASSET (asset), NULL);
  g_return_val_if_fail (g_type_is_a (ges_asset_get_extractable_type
          (asset), GES_TYPE_CLIP), NULL);

  GST_DEBUG_OBJECT (layer, "Adding asset %s with: start: %" GST_TIME_FORMAT
      " inpoint: %" GST_TIME_FORMAT " duration: %" GST_TIME_FORMAT
      " track types: %d (%s)", ges_asset_get_id (asset), GST_TIME_ARGS (start),
      GST_TIME_ARGS (inpoint), GST_TIME_ARGS (duration), track_types,
      ges_track_type_name (track_types));

  clip = GES_CLIP (ges_asset_extract (asset, NULL));

  if (!GST_CLOCK_TIME_IS_VALID (start)) {
    start = ges_layer_get_duration (layer);

    GST_DEBUG_OBJECT (layer,
        "No start specified, setting it to %" GST_TIME_FORMAT,
        GST_TIME_ARGS (start));
  }

  _set_start0 (GES_TIMELINE_ELEMENT (clip), start);
  _set_inpoint0 (GES_TIMELINE_ELEMENT (clip), inpoint);
  if (track_types != GES_TRACK_TYPE_UNKNOWN)
    ges_clip_set_supported_formats (clip, track_types);

  if (GST_CLOCK_TIME_IS_VALID (duration)) {
    _set_duration0 (GES_TIMELINE_ELEMENT (clip), duration);
  }

  if (!ges_layer_add_clip (layer, clip)) {
    return NULL;
  }

  return clip;
}

/**
 * ges_layer_new:
 *
 * Creates a new #GESLayer.
 *
 * Returns: (transfer floating): A new #GESLayer
 */
GESLayer *
ges_layer_new (void)
{
  return g_object_new (GES_TYPE_LAYER, NULL);
}

/**
 * ges_layer_get_timeline:
 * @layer: The #GESLayer to get the parent #GESTimeline from
 *
 * Get the #GESTimeline in which #GESLayer currently is.
 *
 * Returns: (transfer none) (nullable): the #GESTimeline in which #GESLayer
 * currently is or %NULL if not in any timeline yet.
 */
GESTimeline *
ges_layer_get_timeline (GESLayer * layer)
{
  g_return_val_if_fail (GES_IS_LAYER (layer), NULL);

  return layer->timeline;
}

void
ges_layer_set_timeline (GESLayer * layer, GESTimeline * timeline)
{
  GList *tmp;

  g_return_if_fail (GES_IS_LAYER (layer));

  GST_DEBUG ("layer:%p, timeline:%p", layer, timeline);

  for (tmp = layer->priv->clips_start; tmp; tmp = tmp->next) {
    ges_timeline_element_set_timeline (tmp->data, timeline);
  }

  layer->timeline = timeline;
}

/**
 * ges_layer_get_clips_in_interval:
 * @layer: a #GESLayer
 * @start: start of the interval
 * @end: end of the interval
 *
 * Gets the clips which appear between @start and @end on @layer.
 *
 * Returns: (transfer full) (element-type GESClip): a #GList of clips intersecting [@start, @end) interval on @layer.
 */
GList *
ges_layer_get_clips_in_interval (GESLayer * layer, GstClockTime start,
    GstClockTime end)
{
  GList *tmp;
  GList *intersecting_clips = NULL;
  GstClockTime clip_start, clip_end;
  gboolean clip_intersects;

  g_return_val_if_fail (GES_IS_LAYER (layer), NULL);

  for (tmp = layer->priv->clips_start; tmp; tmp = tmp->next) {
    clip_intersects = FALSE;
    clip_start = ges_timeline_element_get_start (tmp->data);
    clip_end = clip_start + ges_timeline_element_get_duration (tmp->data);
    if (start <= clip_start && clip_start < end)
      clip_intersects = TRUE;
    else if (start < clip_end && clip_end <= end)
      clip_intersects = TRUE;
    else if (clip_start < start && clip_end > end)
      clip_intersects = TRUE;

    if (clip_intersects)
      intersecting_clips =
          g_list_insert_sorted (intersecting_clips,
          gst_object_ref (tmp->data), (GCompareFunc) element_start_compare);
  }
  return intersecting_clips;
}