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GESTimeline: Track internal pads and tracks in sync.

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Add method to get the Track associated to a ghostpad.
This commit is contained in:
Edward Hervey 2009-09-08 19:44:03 +02:00
parent 23a95ded19
commit 416323c649
2 changed files with 132 additions and 9 deletions
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139
ges/ges-timeline.c
View file

@ -36,6 +36,15 @@
G_DEFINE_TYPE (GESTimeline, ges_timeline, GST_TYPE_BIN);
/* private structure to contain our track-related information */
typedef struct
{
GESTimeline *timeline;
GESTrack *track;
GstPad *pad; /* Pad from the track */
GstPad *ghostpad;
} TrackPrivate;
enum
{
@ -48,6 +57,7 @@ enum
static guint ges_timeline_signals[LAST_SIGNAL] = { 0 };
gint custom_find_track (TrackPrivate * priv, GESTrack * track);
static void
ges_timeline_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
@ -155,7 +165,8 @@ layer_object_added_cb (GESTimelineLayer * layer, GESTimelineObject * object,
GST_DEBUG ("New TimelineObject %p added to layer %p", object, layer);
for (tmp = timeline->tracks; tmp; tmp = g_list_next (tmp)) {
GESTrack *track = (GESTrack *) tmp->data;
TrackPrivate *priv = (TrackPrivate *) tmp->data;
GESTrack *track = priv->track;
GESTrackObject *trobj;
GST_LOG ("Trying with track %p", track);
@ -189,8 +200,9 @@ layer_object_removed_cb (GESTimelineLayer * layer, GESTimelineObject * object,
GESTrackObject *trobj = (GESTrackObject *) tmp->data;
GST_DEBUG ("Trying to remove TrackObject %p", trobj);
if (G_LIKELY (g_list_find (timeline->tracks, trobj->track))) {
if (G_LIKELY (g_list_find_custom (timeline->tracks,
(gconstpointer) trobj->track,
(GCompareFunc) custom_find_track))) {
GST_DEBUG ("Belongs to one of the tracks we control");
ges_track_remove_object (trobj->track, trobj);
@ -267,13 +279,69 @@ ges_timeline_remove_layer (GESTimeline * timeline, GESTimelineLayer * layer)
return TRUE;
}
static void
pad_added_cb (GESTrack * track, GstPad * pad, TrackPrivate * priv)
{
GST_DEBUG ("track:%p, pad:%s:%s", track, GST_DEBUG_PAD_NAME (pad));
if (G_UNLIKELY (priv->pad)) {
GST_WARNING ("We are already controlling a pad for this track");
return;
}
/* Remember the pad */
priv->pad = pad;
/* ghost it ! */
GST_DEBUG ("Ghosting pad and adding it to ourself");
priv->ghostpad = gst_ghost_pad_new (GST_PAD_NAME (pad), pad);
gst_pad_set_active (priv->ghostpad, TRUE);
gst_element_add_pad (GST_ELEMENT (priv->timeline), priv->ghostpad);
}
static void
pad_removed_cb (GESTrack * track, GstPad * pad, TrackPrivate * priv)
{
GST_DEBUG ("track:%p, pad:%s:%s", track, GST_DEBUG_PAD_NAME (pad));
if (G_UNLIKELY (priv->pad != pad)) {
GST_WARNING ("Not the pad we're controlling");
return;
}
if (G_UNLIKELY (priv->ghostpad == NULL)) {
GST_WARNING ("We don't have a ghostpad for this pad !");
return;
}
GST_DEBUG ("Removing ghostpad");
gst_pad_set_active (priv->ghostpad, FALSE);
gst_element_remove_pad (GST_ELEMENT (priv->timeline), priv->ghostpad);
gst_object_unref (priv->ghostpad);
priv->ghostpad = NULL;
priv->pad = NULL;
}
gint
custom_find_track (TrackPrivate * priv, GESTrack * track)
{
if (priv->track == track)
return 0;
return -1;
}
gboolean
ges_timeline_add_track (GESTimeline * timeline, GESTrack * track)
{
GList *tmp;
TrackPrivate *priv;
GST_DEBUG ("timeline:%p, track:%p", timeline, track);
/* make sure we don't already control it */
if (G_UNLIKELY (g_list_find (timeline->tracks, (gconstpointer) track))) {
if (G_UNLIKELY ((tmp =
g_list_find_custom (timeline->tracks, (gconstpointer) track,
(GCompareFunc) custom_find_track)))) {
GST_WARNING ("Track is already controlled by this timeline");
return FALSE;
}
@ -285,8 +353,16 @@ ges_timeline_add_track (GESTimeline * timeline, GESTrack * track)
return FALSE;
}
priv = g_new0 (TrackPrivate, 1);
priv->timeline = timeline;
priv->track = track;
/* Add the track to the list of tracks we track */
timeline->tracks = g_list_append (timeline->tracks, track);
timeline->tracks = g_list_append (timeline->tracks, priv);
/* Listen to pad-added/-removed */
g_signal_connect (track, "pad-added", (GCallback) pad_added_cb, priv);
g_signal_connect (track, "pad-removed", (GCallback) pad_removed_cb, priv);
/* Inform the track that it's currently being used by ourself */
ges_track_set_timeline (track, timeline);
@ -302,25 +378,70 @@ ges_timeline_add_track (GESTimeline * timeline, GESTrack * track)
gboolean
ges_timeline_remove_track (GESTimeline * timeline, GESTrack * track)
{
GList *tmp;
TrackPrivate *priv;
GST_DEBUG ("timeline:%p, track:%p", timeline, track);
if (G_UNLIKELY (!g_list_find (timeline->tracks, track))) {
if (G_UNLIKELY (!(tmp =
g_list_find_custom (timeline->tracks, (gconstpointer) track,
(GCompareFunc) custom_find_track)))) {
GST_WARNING ("Track doesn't belong to this timeline");
return FALSE;
}
timeline->tracks = g_list_remove (timeline->tracks, track);
priv = tmp->data;
timeline->tracks = g_list_remove (timeline->tracks, priv);
ges_track_set_timeline (track, NULL);
/* Remove ghost pad */
if (priv->ghostpad) {
GST_DEBUG ("Removing ghostpad");
gst_pad_set_active (priv->ghostpad, FALSE);
gst_ghost_pad_set_target ((GstGhostPad *) priv->ghostpad, NULL);
gst_element_remove_pad (GST_ELEMENT (timeline), priv->ghostpad);
}
/* Remove pad-added/-removed handlers */
g_signal_handlers_disconnect_by_func (track, pad_added_cb, priv);
g_signal_handlers_disconnect_by_func (track, pad_removed_cb, priv);
/* Signal track removal to all layers/objects */
g_signal_emit (timeline, ges_timeline_signals[TRACK_REMOVED], 0, track);
/* remove track from our bin */
if (G_UNLIKELY (!gst_bin_remove (GST_BIN (timeline), GST_ELEMENT (track)))) {
GST_WARNING ("Couldn't remove track to ourself (GST)");
return FALSE;
}
/* Signal track removal to all layers/objects */
g_signal_emit (timeline, ges_timeline_signals[TRACK_REMOVED], 0, track);
g_free (priv);
return TRUE;
}
/**
* ges_timeline_get_track_for_pad:
* @timeline: The #GESTimeline
* @pad: The #GstPad
*
* Search the #GESTrack corresponding to the given @timeline's @pad.
*
* Returns: The corresponding #GESTrack if it is found, or #NULL if there is
* an error.
*/
GESTrack *
ges_timeline_get_track_for_pad (GESTimeline * timeline, GstPad * pad)
{
GList *tmp;
for (tmp = timeline->tracks; tmp; tmp = g_list_next (tmp)) {
TrackPrivate *priv = (TrackPrivate *) tmp->data;
if (pad == priv->ghostpad)
return priv->track;
}
return NULL;
}

2
ges/ges-timeline.h
View file

@ -74,6 +74,8 @@ gboolean ges_timeline_remove_layer (GESTimeline *timeline, GESTimelineLayer *lay
gboolean ges_timeline_add_track (GESTimeline *timeline, GESTrack *track);
gboolean ges_timeline_remove_track (GESTimeline *timeline, GESTrack *track);
GESTrack * ges_timeline_get_track_for_pad (GESTimeline *timeline, GstPad *pad);
G_END_DECLS
#endif /* _GES_TIMELINE */