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clip: allow for neither track nor type in search

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Previously, either the track or track_type arguments had to be specified
in order to find **any** track elements. Now, you can specify neither,
which will match any track element, of the specified type.
This commit is contained in:
Henry Wilkes 2020-02-18 18:02:08 +00:00 committed by Thibault Saunier
parent b6fb2ed531
commit f1d29e10e6
1 changed files with 24 additions and 28 deletions
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52
ges/ges-clip.c
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@ -1637,23 +1637,26 @@ ges_clip_add_asset (GESClip * clip, GESAsset * asset)
* all tracks
* @track_type: The track-type of the track element to search for, or
* #GES_TRACK_TYPE_UNKNOWN to match any track type
* @type: The type of track element to search for, or %NULL to match any
* type
* @type: The type of track element to search for, or %G_TYPE_NONE to
* match any type
*
* Finds the #GESTrackElement-s controlled by the clip that match the
* given criteria. You must give either @track (not %NULL) or @track_type
* (not #GES_TRACK_TYPE_UNKNOWN) in order to find any elements. If @track
* is given, and @track_type is not, then only the track elements in
* @track are searched for. Otherwise, if @track_type is given, and @track
* is not, then only the track elements whose #GESTrackElement:track-type
* matches @track_type are searched for. If both are given, then the track
* elements that match **either** criteria are searched for (so if you
* wish to only find all the elements in a given track, you should give
* the track as @track, but should not give the track's
* #GESTrack:track-type as @track_type because this would also select
* elements from other tracks of the same type).
* given criteria. If @track is given as %NULL and @track_type is given as
* #GES_TRACK_TYPE_UNKNOWN, then the search will match all elements in any
* track, including those with no track, and of any
* #GESTrackElement:track-type. Otherwise, if @track is not %NULL, but
* @track_type is #GES_TRACK_TYPE_UNKNOWN, then only the track elements in
* @track are searched for. Otherwise, if @track_type is not
* #GES_TRACK_TYPE_UNKNOWN, but @track is %NULL, then only the track
* elements whose #GESTrackElement:track-type matches @track_type are
* searched for. Otherwise, when both are given, the track elements that
* match **either** criteria are searched for. Therefore, if you wish to
* only find elements in a specific track, you should give the track as
* @track, but you should not give the track's #GESTrack:track-type as
* @track_type because this would also select elements from other tracks
* of the same type.
*
* You may also give @type to further restrict the search to track
* You may also give @type to _further_ restrict the search to track
* elements of the given @type.
*
* Returns: (transfer full) (element-type GESTrackElement): A list of all
@ -1666,9 +1669,7 @@ ges_clip_find_track_elements (GESClip * clip, GESTrack * track,
GESTrackType track_type, GType type)
{
GList *tmp;
GESTrack *tmptrack;
GESTrackElement *otmp;
GESTrackElement *foundElement;
GList *ret = NULL;
@ -1682,19 +1683,14 @@ ges_clip_find_track_elements (GESClip * clip, GESTrack * track,
if ((type != G_TYPE_NONE) && !G_TYPE_CHECK_INSTANCE_TYPE (tmp->data, type))
continue;
tmptrack = ges_track_element_get_track (otmp);
/* TODO 2.0: an AND condition would have made more sense here */
/* FIXME: if neither the track nor the track_type are given, we should
* still match the elements that match the given type (currently the
* list will be empty if only the type is given) */
if (((track != NULL && tmptrack == track)) ||
/* TODO 2.0: an AND condition, using a condition like the above type
* check would have made more sense here. Especially when both
* track != NULL and track_type != GES_TRACK_TYPE_UNKNOWN are given */
if ((track == NULL && track_type == GES_TRACK_TYPE_UNKNOWN) ||
(track != NULL && ges_track_element_get_track (otmp) == track) ||
(track_type != GES_TRACK_TYPE_UNKNOWN
&& ges_track_element_get_track_type (otmp) == track_type)) {
foundElement = GES_TRACK_ELEMENT (tmp->data);
ret = g_list_append (ret, gst_object_ref (foundElement));
}
&& ges_track_element_get_track_type (otmp) == track_type))
ret = g_list_append (ret, gst_object_ref (otmp));
}
return ret;