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91b5a5804a
Only allow elements that were created by ges_clip_create_track_elements (or copied from such an element) to be added to a clip. This prevents users from adding arbitrary elements to a clip. As an exception, a user can add GESBaseEffects to clips whose class supports it, i.e. to a GESSourceClip and a GESBaseEffectClip. This change also introduces a distinction between the core elements of a clip (created by ges_clip_create_track_elements) and non-core elements (currently, only GESBaseEffects, for some classes). In particular, GESBaseEffectClip will now distinguish between its core elements and effects added by the user. This means that the core elements will always have the lowest priority, and will not be listed as top effects. This is desirable because it brings the behaviour of GESBaseEffectClip in line with other clip types.
202 lines
7.3 KiB
C
202 lines
7.3 KiB
C
/* GStreamer Editing Services
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* Copyright (C) 2009 Edward Hervey <edward.hervey@collabora.co.uk>
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* 2009 Nokia Corporation
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef _GES_CLIP
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#define _GES_CLIP
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#include <glib-object.h>
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#include <gst/gst.h>
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#include <ges/ges-timeline-element.h>
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#include <ges/ges-container.h>
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#include <ges/ges-types.h>
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#include <ges/ges-track.h>
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G_BEGIN_DECLS
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#define GES_TYPE_CLIP ges_clip_get_type()
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#define GES_CLIP(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GES_TYPE_CLIP, GESClip))
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#define GES_CLIP_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GES_TYPE_CLIP, GESClipClass))
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#define GES_IS_CLIP(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GES_TYPE_CLIP))
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#define GES_IS_CLIP_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GES_TYPE_CLIP))
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#define GES_CLIP_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GES_TYPE_CLIP, GESClipClass))
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typedef struct _GESClipPrivate GESClipPrivate;
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/**
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* GES_CLIP_CLASS_CAN_ADD_EFFECTS:
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* @klass: A #GESClipClass
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*
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* Whether the class allows for the user to add additional non-core
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* #GESBaseEffect-s to clips from this class.
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*/
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#define GES_CLIP_CLASS_CAN_ADD_EFFECTS(klass) ((GES_CLIP_CLASS (klass))->ABI.abi.can_add_effects)
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/**
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* GESFillTrackElementFunc:
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* @clip: The #GESClip controlling the track elements
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* @track_element: The #GESTrackElement
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* @nleobj: The nleobject that needs to be filled
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*
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* A function that will be called when the nleobject of a corresponding
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* track element needs to be filled.
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*
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* The implementer of this function shall add the proper #GstElement to @nleobj
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* using gst_bin_add().
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*
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* Deprecated: 1.18: This method type is no longer used.
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*
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* Returns: %TRUE if the implementer successfully filled the @nleobj.
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*/
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typedef gboolean (*GESFillTrackElementFunc) (GESClip *clip, GESTrackElement *track_element,
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GstElement *nleobj);
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/**
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* GESCreateTrackElementFunc:
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* @clip: A #GESClip
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* @type: A #GESTrackType to create a #GESTrackElement for
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*
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* A method for creating the core #GESTrackElement of a clip, to be added
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* to a #GESTrack of the given track type.
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*
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* If a clip may produce several track elements per track type,
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* #GESCreateTrackElementsFunc is more appropriate.
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*
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* Returns: (transfer floating) (nullable): The #GESTrackElement created
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* by @clip, or %NULL if @clip can not provide a track element for the
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* given @type or an error occurred.
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*/
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typedef GESTrackElement *(*GESCreateTrackElementFunc) (GESClip * clip, GESTrackType type);
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/**
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* GESCreateTrackElementsFunc:
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* @clip: A #GESClip
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* @type: A #GESTrackType to create #GESTrackElement-s for
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*
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* A method for creating the core #GESTrackElement-s of a clip, to be
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* added to #GESTrack-s of the given track type.
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*
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* Returns: (transfer container) (element-type GESTrackElement): A list of
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* the #GESTrackElement-s created by @clip for the given @type, or %NULL
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* if no track elements are created or an error occurred.
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*/
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typedef GList * (*GESCreateTrackElementsFunc) (GESClip * clip, GESTrackType type);
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/**
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* GESClip:
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*/
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struct _GESClip
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{
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GESContainer parent;
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/*< private >*/
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GESClipPrivate *priv;
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/* Padding for API extension */
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gpointer _ges_reserved[GES_PADDING_LARGE];
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};
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/**
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* GESClipClass:
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* @create_track_element: Method to create the core #GESTrackElement of
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* a clip of this class. If a clip of this class may create several track
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* elements per track type, this should be left as %NULL, and
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* create_track_elements() should be used instead. Otherwise, you should
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* implement this class method and leave create_track_elements() as the
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* default implementation
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* @create_track_elements: Method to create the (multiple) core
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* #GESTrackElement-s of a clip of this class. If create_track_element()
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* is implemented, this should be kept as the default implementation
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* @can_add_effects: Whether the user can add additional non-core
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* #GESBaseEffect-s to clips from this class, to be applied to the output
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* data of the core elements.
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*/
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struct _GESClipClass
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{
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/*< private > */
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GESContainerClass parent_class;
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/*< public > */
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GESCreateTrackElementFunc create_track_element;
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GESCreateTrackElementsFunc create_track_elements;
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/*< private >*/
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/* Padding for API extension */
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union {
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gpointer _ges_reserved[GES_PADDING_LARGE];
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struct {
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gboolean can_add_effects;
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} abi;
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} ABI;
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};
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/****************************************************
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* Standard *
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****************************************************/
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GES_API
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GType ges_clip_get_type (void);
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/****************************************************
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* TrackElement handling *
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****************************************************/
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GES_API
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GESTrackType ges_clip_get_supported_formats (GESClip *clip);
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GES_API
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void ges_clip_set_supported_formats (GESClip *clip, GESTrackType supportedformats);
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GES_API
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GESTrackElement* ges_clip_add_asset (GESClip *clip, GESAsset *asset);
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GES_API
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GESTrackElement* ges_clip_find_track_element (GESClip *clip, GESTrack *track,
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GType type);
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GES_API
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GList * ges_clip_find_track_elements (GESClip * clip, GESTrack * track,
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GESTrackType track_type, GType type);
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/****************************************************
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* Layer *
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****************************************************/
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GES_API
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GESLayer* ges_clip_get_layer (GESClip *clip);
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GES_API
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gboolean ges_clip_move_to_layer (GESClip *clip, GESLayer *layer);
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/****************************************************
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* Effects *
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****************************************************/
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GES_API
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GList* ges_clip_get_top_effects (GESClip *clip);
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GES_API
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gint ges_clip_get_top_effect_position (GESClip *clip, GESBaseEffect *effect);
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GES_API
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gint ges_clip_get_top_effect_index (GESClip *clip, GESBaseEffect *effect);
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GES_API
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gboolean ges_clip_set_top_effect_priority (GESClip *clip, GESBaseEffect *effect,
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guint newpriority);
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GES_API
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gboolean ges_clip_set_top_effect_index (GESClip *clip, GESBaseEffect *effect,
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guint newindex);
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/****************************************************
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* Editing *
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****************************************************/
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GES_API
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GESClip* ges_clip_split (GESClip *clip, guint64 position);
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G_END_DECLS
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#endif /* _GES_CLIP */
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