gstreamer/ges/ges-track.c
2014-10-26 20:36:22 +00:00

1033 lines
28 KiB
C

/* GStreamer Editing Services
* Copyright (C) 2009 Edward Hervey <edward.hervey@collabora.co.uk>
* 2009 Nokia Corporation
*
* 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:gestrack
* @short_description: Composition of objects
*
* Corresponds to one output format (i.e. audio OR video).
*
* Contains the compatible TrackElement(s).
*
* Wraps GNonLin's 'gnlcomposition' element.
*/
#include "ges-internal.h"
#include "ges-track.h"
#include "ges-track-element.h"
#include "ges-meta-container.h"
#include "ges-video-track.h"
#include "ges-audio-track.h"
G_DEFINE_TYPE_WITH_CODE (GESTrack, ges_track, GST_TYPE_BIN,
G_IMPLEMENT_INTERFACE (GES_TYPE_META_CONTAINER, NULL));
/* Structure that represents gaps and keep knowledge
* of the gaps filled in the track */
typedef struct
{
GstElement *gnlobj;
GstClockTime start;
GstClockTime duration;
GESTrack *track;
} Gap;
struct _GESTrackPrivate
{
/*< private > */
GESTimeline *timeline;
GSequence *trackelements_by_start;
GHashTable *trackelements_iter;
GList *gaps;
guint64 duration;
GstCaps *caps;
GstCaps *restriction_caps;
GstElement *composition; /* The composition associated with this track */
GstPad *srcpad; /* The source GhostPad */
gboolean updating;
gboolean mixing;
GstElement *mixing_operation;
GstElement *capsfilter;
/* Virtual method to create GstElement that fill gaps */
GESCreateElementForGapFunc create_element_for_gaps;
};
enum
{
ARG_0,
ARG_CAPS,
ARG_RESTRICTION_CAPS,
ARG_TYPE,
ARG_DURATION,
ARG_MIXING,
ARG_LAST,
TRACK_ELEMENT_ADDED,
TRACK_ELEMENT_REMOVED,
LAST_SIGNAL
};
static guint ges_track_signals[LAST_SIGNAL] = { 0 };
static GParamSpec *properties[ARG_LAST];
static void pad_added_cb (GstElement * element, GstPad * pad, GESTrack * track);
static void
pad_removed_cb (GstElement * element, GstPad * pad, GESTrack * track);
static void composition_duration_cb (GstElement * composition, GParamSpec * arg
G_GNUC_UNUSED, GESTrack * obj);
/* Private methods/functions/callbacks */
static void
add_trackelement_to_list_foreach (GESTrackElement * trackelement, GList ** list)
{
gst_object_ref (trackelement);
*list = g_list_prepend (*list, trackelement);
}
static Gap *
gap_new (GESTrack * track, GstClockTime start, GstClockTime duration)
{
GstElement *gnlsrc, *elem;
Gap *new_gap;
gnlsrc = gst_element_factory_make ("gnlsource", NULL);
elem = track->priv->create_element_for_gaps (track);
if (G_UNLIKELY (gst_bin_add (GST_BIN (gnlsrc), elem) == FALSE)) {
GST_WARNING_OBJECT (track, "Could not create gap filler");
if (gnlsrc)
gst_object_unref (gnlsrc);
if (elem)
gst_object_unref (elem);
return NULL;
}
if (G_UNLIKELY (gst_bin_add (GST_BIN (track->priv->composition),
gnlsrc) == FALSE)) {
GST_WARNING_OBJECT (track, "Could not add gap to the composition");
if (gnlsrc)
gst_object_unref (gnlsrc);
if (elem)
gst_object_unref (elem);
return NULL;
}
new_gap = g_slice_new (Gap);
new_gap->start = start;
new_gap->duration = duration;
new_gap->track = track;
new_gap->gnlobj = gst_object_ref (gnlsrc);
g_object_set (gnlsrc, "start", new_gap->start, "duration", new_gap->duration,
"priority", 1, NULL);
GST_DEBUG_OBJECT (track,
"Created gap with start %" GST_TIME_FORMAT " duration %" GST_TIME_FORMAT,
GST_TIME_ARGS (new_gap->start), GST_TIME_ARGS (new_gap->duration));
return new_gap;
}
static void
free_gap (Gap * gap)
{
GESTrack *track = gap->track;
GST_DEBUG_OBJECT (track, "Removed gap with start %" GST_TIME_FORMAT
" duration %" GST_TIME_FORMAT, GST_TIME_ARGS (gap->start),
GST_TIME_ARGS (gap->duration));
gst_bin_remove (GST_BIN (track->priv->composition), gap->gnlobj);
gst_element_set_state (gap->gnlobj, GST_STATE_NULL);
gst_object_unref (gap->gnlobj);
g_slice_free (Gap, gap);
}
static inline void
update_gaps (GESTrack * track)
{
Gap *gap;
GList *gaps;
GSequenceIter *it;
GESTrackElement *trackelement;
GstClockTime start, end, duration = 0, timeline_duration;
GESTrackPrivate *priv = track->priv;
if (priv->create_element_for_gaps == NULL) {
GST_INFO ("Not filling the gaps as no create_element_for_gaps vmethod"
" provided");
return;
}
gaps = priv->gaps;
priv->gaps = NULL;
/* 1- And recalculate gaps */
for (it = g_sequence_get_begin_iter (priv->trackelements_by_start);
g_sequence_iter_is_end (it) == FALSE; it = g_sequence_iter_next (it)) {
trackelement = g_sequence_get (it);
if (!ges_track_element_is_active (trackelement))
continue;
start = _START (trackelement);
end = start + _DURATION (trackelement);
if (start > duration) {
/* 2- Fill gap */
gap = gap_new (track, duration, start - duration);
if (G_LIKELY (gap != NULL))
priv->gaps = g_list_prepend (priv->gaps, gap);
}
duration = MAX (duration, end);
}
/* 4- Add a gap at the end of the timeline if needed */
if (priv->timeline) {
g_object_get (priv->timeline, "duration", &timeline_duration, NULL);
if (duration < timeline_duration) {
gap = gap_new (track, duration, timeline_duration - duration);
if (G_LIKELY (gap != NULL)) {
priv->gaps = g_list_prepend (priv->gaps, gap);
}
priv->duration = timeline_duration;
}
}
/* 4- Remove old gaps */
g_list_free_full (gaps, (GDestroyNotify) free_gap);
}
static inline void
resort_and_fill_gaps (GESTrack * track)
{
g_sequence_sort (track->priv->trackelements_by_start,
(GCompareDataFunc) element_start_compare, NULL);
if (track->priv->updating == TRUE) {
update_gaps (track);
}
}
/* callbacks */
static void
sort_track_elements_cb (GESTrackElement * child,
GParamSpec * arg G_GNUC_UNUSED, GESTrack * track)
{
g_sequence_sort (track->priv->trackelements_by_start,
(GCompareDataFunc) element_start_compare, NULL);
}
static void
pad_added_cb (GstElement * element, GstPad * pad, GESTrack * track)
{
GESTrackPrivate *priv = track->priv;
GstPad *capsfilter_sink;
GstPad *capsfilter_src;
capsfilter_sink = gst_element_get_static_pad (priv->capsfilter, "sink");
GST_DEBUG ("track:%p, pad %s:%s", track, GST_DEBUG_PAD_NAME (pad));
gst_pad_link (pad, capsfilter_sink);
gst_object_unref (capsfilter_sink);
capsfilter_src = gst_element_get_static_pad (priv->capsfilter, "src");
/* ghost the pad */
priv->srcpad = gst_ghost_pad_new ("src", capsfilter_src);
gst_object_unref (capsfilter_src);
gst_pad_set_active (priv->srcpad, TRUE);
gst_element_add_pad (GST_ELEMENT (track), priv->srcpad);
GST_DEBUG ("done");
}
static void
pad_removed_cb (GstElement * element, GstPad * pad, GESTrack * track)
{
GESTrackPrivate *priv = track->priv;
GST_DEBUG ("track:%p, pad %s:%s", track, GST_DEBUG_PAD_NAME (pad));
if (G_LIKELY (priv->srcpad)) {
gst_pad_set_active (priv->srcpad, FALSE);
gst_element_remove_pad (GST_ELEMENT (track), priv->srcpad);
priv->srcpad = NULL;
}
GST_DEBUG ("done");
}
static void
composition_duration_cb (GstElement * composition,
GParamSpec * arg G_GNUC_UNUSED, GESTrack * track)
{
guint64 duration;
g_object_get (composition, "duration", &duration, NULL);
if (track->priv->duration != duration) {
GST_DEBUG_OBJECT (track,
"composition duration : %" GST_TIME_FORMAT " current : %"
GST_TIME_FORMAT, GST_TIME_ARGS (duration),
GST_TIME_ARGS (track->priv->duration));
track->priv->duration = duration;
g_object_notify_by_pspec (G_OBJECT (track), properties[ARG_DURATION]);
}
}
/* FIXME: Find out how to avoid doing this "hack" using the GDestroyNotify
* function pointer in the trackelements_by_start GSequence
*
* Remove @object from @track, but keeps it in the sequence this is needed
* when finalizing as we can not change a GSequence at the same time we are
* accessing it
*/
static gboolean
remove_object_internal (GESTrack * track, GESTrackElement * object)
{
GESTrackPrivate *priv;
GstElement *gnlobject;
GST_DEBUG_OBJECT (track, "object:%p", object);
priv = track->priv;
if (G_UNLIKELY (ges_track_element_get_track (object) != track)) {
GST_WARNING ("Object belongs to another track");
return FALSE;
}
if ((gnlobject = ges_track_element_get_gnlobject (object))) {
GST_DEBUG ("Removing GnlObject '%s' from composition '%s'",
GST_ELEMENT_NAME (gnlobject), GST_ELEMENT_NAME (priv->composition));
if (!gst_bin_remove (GST_BIN (priv->composition), gnlobject)) {
GST_WARNING ("Failed to remove gnlobject from composition");
return FALSE;
}
gst_element_set_state (gnlobject, GST_STATE_NULL);
}
g_signal_handlers_disconnect_by_func (object, sort_track_elements_cb, NULL);
ges_track_element_set_track (object, NULL);
ges_timeline_element_set_timeline (GES_TIMELINE_ELEMENT (object), NULL);
g_signal_emit (track, ges_track_signals[TRACK_ELEMENT_REMOVED], 0,
GES_TRACK_ELEMENT (object));
gst_object_unref (object);
return TRUE;
}
static void
dispose_trackelements_foreach (GESTrackElement * trackelement, GESTrack * track)
{
remove_object_internal (track, trackelement);
}
/* GObject virtual methods */
static void
ges_track_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
GESTrack *track = GES_TRACK (object);
switch (property_id) {
case ARG_CAPS:
gst_value_set_caps (value, track->priv->caps);
break;
case ARG_TYPE:
g_value_set_flags (value, track->type);
break;
case ARG_DURATION:
g_value_set_uint64 (value, track->priv->duration);
break;
case ARG_RESTRICTION_CAPS:
gst_value_set_caps (value, track->priv->restriction_caps);
break;
case ARG_MIXING:
g_value_set_boolean (value, track->priv->mixing);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ges_track_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
GESTrack *track = GES_TRACK (object);
switch (property_id) {
case ARG_CAPS:
ges_track_set_caps (track, gst_value_get_caps (value));
break;
case ARG_TYPE:
track->type = g_value_get_flags (value);
break;
case ARG_RESTRICTION_CAPS:
ges_track_set_restriction_caps (track, gst_value_get_caps (value));
break;
case ARG_MIXING:
ges_track_set_mixing (track, g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ges_track_dispose (GObject * object)
{
GESTrack *track = (GESTrack *) object;
GESTrackPrivate *priv = track->priv;
/* Remove all TrackElements and drop our reference */
g_hash_table_unref (priv->trackelements_iter);
g_sequence_foreach (track->priv->trackelements_by_start,
(GFunc) dispose_trackelements_foreach, track);
g_sequence_free (priv->trackelements_by_start);
g_list_free_full (priv->gaps, (GDestroyNotify) free_gap);
if (priv->mixing_operation)
gst_object_unref (priv->mixing_operation);
if (priv->composition) {
gst_bin_remove (GST_BIN (object), priv->composition);
priv->composition = NULL;
}
if (priv->caps) {
gst_caps_unref (priv->caps);
priv->caps = NULL;
}
if (priv->restriction_caps) {
gst_caps_unref (priv->restriction_caps);
priv->restriction_caps = NULL;
}
G_OBJECT_CLASS (ges_track_parent_class)->dispose (object);
}
static void
ges_track_finalize (GObject * object)
{
G_OBJECT_CLASS (ges_track_parent_class)->finalize (object);
}
static void
ges_track_constructed (GObject * object)
{
GESTrack *self = GES_TRACK (object);
if (!gst_bin_add (GST_BIN (self), self->priv->composition))
GST_ERROR ("Couldn't add composition to bin !");
if (!gst_bin_add (GST_BIN (self), self->priv->capsfilter))
GST_ERROR ("Couldn't add capsfilter to bin !");
if (GES_TRACK_GET_CLASS (self)->get_mixing_element) {
GstElement *gnlobject;
GstElement *mixer = GES_TRACK_GET_CLASS (self)->get_mixing_element (self);
if (mixer == NULL) {
GST_WARNING_OBJECT (self, "Got no element fron get_mixing_element");
return;
}
gnlobject = gst_element_factory_make ("gnloperation", "mixing-operation");
if (!gst_bin_add (GST_BIN (gnlobject), mixer)) {
GST_WARNING_OBJECT (self, "Could not add the mixer to our composition");
gst_object_unref (gnlobject);
return;
}
g_object_set (gnlobject, "expandable", TRUE, NULL);
if (self->priv->mixing) {
if (!gst_bin_add (GST_BIN (self->priv->composition), gnlobject)) {
GST_WARNING_OBJECT (self, "Could not add the mixer to our composition");
return;
}
}
self->priv->mixing_operation = gst_object_ref (gnlobject);
} else {
GST_INFO_OBJECT (self, "No way to create a main mixer");
}
}
static void
ges_track_class_init (GESTrackClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
g_type_class_add_private (klass, sizeof (GESTrackPrivate));
object_class->get_property = ges_track_get_property;
object_class->set_property = ges_track_set_property;
object_class->dispose = ges_track_dispose;
object_class->finalize = ges_track_finalize;
object_class->constructed = ges_track_constructed;
/**
* GESTrack:caps:
*
* Caps used to filter/choose the output stream. This is generally set to
* a generic set of caps like 'video/x-raw' for raw video.
*
* Default value: #GST_CAPS_ANY.
*/
properties[ARG_CAPS] = g_param_spec_boxed ("caps", "Caps",
"Caps used to filter/choose the output stream",
GST_TYPE_CAPS, G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY);
g_object_class_install_property (object_class, ARG_CAPS,
properties[ARG_CAPS]);
/**
* GESTrack:restriction-caps:
*
* Caps used to filter/choose the output stream.
*
* Default value: #GST_CAPS_ANY.
*/
properties[ARG_RESTRICTION_CAPS] =
g_param_spec_boxed ("restriction-caps", "Restriction caps",
"Caps used to filter/choose the output stream", GST_TYPE_CAPS,
G_PARAM_READWRITE);
g_object_class_install_property (object_class, ARG_RESTRICTION_CAPS,
properties[ARG_RESTRICTION_CAPS]);
/**
* GESTrack:duration:
*
* Current duration of the track
*
* Default value: O
*/
properties[ARG_DURATION] = g_param_spec_uint64 ("duration", "Duration",
"The current duration of the track", 0, G_MAXUINT64, GST_SECOND,
G_PARAM_READABLE);
g_object_class_install_property (object_class, ARG_DURATION,
properties[ARG_DURATION]);
/**
* GESTrack:track-type:
*
* Type of stream the track outputs. This is used when creating the #GESTrack
* to specify in generic terms what type of content will be outputted.
*
* It also serves as a 'fast' way to check what type of data will be outputted
* from the #GESTrack without having to actually check the #GESTrack's caps
* property.
*/
properties[ARG_TYPE] = g_param_spec_flags ("track-type", "TrackType",
"Type of stream the track outputs",
GES_TYPE_TRACK_TYPE, GES_TRACK_TYPE_CUSTOM,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY);
g_object_class_install_property (object_class, ARG_TYPE,
properties[ARG_TYPE]);
/**
* GESTrack:mixing:
*
* Whether layer mixing is activated or not on the track.
*/
properties[ARG_MIXING] = g_param_spec_boolean ("mixing", "Mixing",
"Whether layer mixing is activated on the track or not",
TRUE, G_PARAM_READWRITE | G_PARAM_CONSTRUCT);
g_object_class_install_property (object_class, ARG_MIXING,
properties[ARG_MIXING]);
/**
* GESTrack::track-element-added:
* @object: the #GESTrack
* @effect: the #GESTrackElement that was added.
*
* Will be emitted after a track element was added to the track.
*/
ges_track_signals[TRACK_ELEMENT_ADDED] =
g_signal_new ("track-element-added", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST, 0, NULL, NULL, g_cclosure_marshal_generic,
G_TYPE_NONE, 1, GES_TYPE_TRACK_ELEMENT);
/**
* GESTrack::track-element-removed:
* @object: the #GESTrack
* @effect: the #GESTrackElement that was removed.
*
* Will be emitted after a track element was removed from the track.
*/
ges_track_signals[TRACK_ELEMENT_REMOVED] =
g_signal_new ("track-element-removed", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST, 0, NULL, NULL, g_cclosure_marshal_generic,
G_TYPE_NONE, 1, GES_TYPE_TRACK_ELEMENT);
klass->get_mixing_element = NULL;
}
static void
ges_track_init (GESTrack * self)
{
self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
GES_TYPE_TRACK, GESTrackPrivate);
self->priv->composition = gst_element_factory_make ("gnlcomposition", NULL);
self->priv->capsfilter = gst_element_factory_make ("capsfilter", NULL);
self->priv->updating = TRUE;
self->priv->trackelements_by_start = g_sequence_new (NULL);
self->priv->trackelements_iter =
g_hash_table_new (g_direct_hash, g_direct_equal);
self->priv->create_element_for_gaps = NULL;
self->priv->gaps = NULL;
self->priv->mixing = TRUE;
self->priv->restriction_caps = NULL;
g_signal_connect (G_OBJECT (self->priv->composition), "notify::duration",
G_CALLBACK (composition_duration_cb), self);
g_signal_connect (self->priv->composition, "pad-added",
(GCallback) pad_added_cb, self);
g_signal_connect (self->priv->composition, "pad-removed",
(GCallback) pad_removed_cb, self);
}
/**
* ges_track_new:
* @type: The type of track
* @caps: (transfer full): The caps to restrict the output of the track to.
*
* Creates a new #GESTrack with the given @type and @caps.
*
* The newly created track will steal a reference to the caps. If you wish to
* use those caps elsewhere, you will have to take an extra reference.
*
* Returns: A new #GESTrack.
*/
GESTrack *
ges_track_new (GESTrackType type, GstCaps * caps)
{
GESTrack *track;
GstCaps *tmpcaps;
/* TODO Be smarter with well known track types */
if (type == GES_TRACK_TYPE_VIDEO) {
tmpcaps = gst_caps_new_empty_simple ("video/x-raw");
if (gst_caps_is_subset (caps, tmpcaps)) {
track = GES_TRACK (ges_video_track_new ());
ges_track_set_caps (track, caps);
gst_caps_unref (tmpcaps);
return track;
}
gst_caps_unref (tmpcaps);
} else if (type == GES_TRACK_TYPE_AUDIO) {
tmpcaps = gst_caps_new_empty_simple ("audio/x-raw");
if (gst_caps_is_subset (caps, tmpcaps)) {
track = GES_TRACK (ges_audio_track_new ());
ges_track_set_caps (track, caps);
gst_caps_unref (tmpcaps);
return track;
}
gst_caps_unref (tmpcaps);
}
track = g_object_new (GES_TYPE_TRACK, "caps", caps, "track-type", type, NULL);
gst_caps_unref (caps);
return track;
}
/**
* ges_track_set_timeline:
* @track: a #GESTrack
* @timeline: a #GESTimeline
*
* Sets @timeline as the timeline controlling @track.
*/
void
ges_track_set_timeline (GESTrack * track, GESTimeline * timeline)
{
GST_DEBUG ("track:%p, timeline:%p", track, timeline);
track->priv->timeline = timeline;
resort_and_fill_gaps (track);
}
/**
* ges_track_set_caps:
* @track: a #GESTrack
* @caps: the #GstCaps to set
*
* Sets the given @caps on the track.
*/
void
ges_track_set_caps (GESTrack * track, const GstCaps * caps)
{
GESTrackPrivate *priv;
g_return_if_fail (GES_IS_TRACK (track));
GST_DEBUG ("track:%p, caps:%" GST_PTR_FORMAT, track, caps);
g_return_if_fail (GST_IS_CAPS (caps));
priv = track->priv;
if (priv->caps)
gst_caps_unref (priv->caps);
priv->caps = gst_caps_copy (caps);
g_object_set (priv->composition, "caps", caps, NULL);
/* FIXME : update all trackelements ? */
}
/**
* ges_track_set_restriction_caps:
* @track: a #GESTrack
* @caps: the #GstCaps to set
*
* Sets the given @caps as the caps the track has to output.
*/
void
ges_track_set_restriction_caps (GESTrack * track, const GstCaps * caps)
{
GESTrackPrivate *priv;
g_return_if_fail (GES_IS_TRACK (track));
GST_DEBUG ("track:%p, restriction caps:%" GST_PTR_FORMAT, track, caps);
g_return_if_fail (GST_IS_CAPS (caps));
priv = track->priv;
if (priv->restriction_caps)
gst_caps_unref (priv->restriction_caps);
priv->restriction_caps = gst_caps_copy (caps);
g_object_set (priv->capsfilter, "caps", caps, NULL);
g_object_notify (G_OBJECT (track), "restriction-caps");
}
/**
* ges_track_set_mixing:
* @track: a #GESTrack
* @mixing: TRUE if the track should be mixing, FALSE otherwise.
*
* Sets if the #GESTrack should be mixing.
*/
void
ges_track_set_mixing (GESTrack * track, gboolean mixing)
{
g_return_if_fail (GES_IS_TRACK (track));
if (!track->priv->mixing_operation) {
GST_DEBUG_OBJECT (track, "Track will be set to mixing = %d", mixing);
track->priv->mixing = mixing;
return;
}
if (mixing == track->priv->mixing) {
GST_DEBUG_OBJECT (track, "Mixing is already set to the same value");
}
if (mixing) {
/* increase ref count to hold the object */
gst_object_ref (track->priv->mixing_operation);
if (!gst_bin_add (GST_BIN (track->priv->composition),
track->priv->mixing_operation)) {
GST_WARNING_OBJECT (track, "Could not add the mixer to our composition");
return;
}
} else {
if (!gst_bin_remove (GST_BIN (track->priv->composition),
track->priv->mixing_operation)) {
GST_WARNING_OBJECT (track,
"Could not remove the mixer from our composition");
return;
}
}
track->priv->mixing = mixing;
GST_DEBUG_OBJECT (track, "The track has been set to mixing = %d", mixing);
}
/**
* ges_track_add_element:
* @track: a #GESTrack
* @object: (transfer full): the #GESTrackElement to add
*
* Adds the given object to the track. Sets the object's controlling track,
* and thus takes ownership of the @object.
*
* An object can only be added to one track.
*
* Returns: #TRUE if the object was properly added. #FALSE if the track does not
* want to accept the object.
*/
gboolean
ges_track_add_element (GESTrack * track, GESTrackElement * object)
{
g_return_val_if_fail (GES_IS_TRACK (track), FALSE);
g_return_val_if_fail (GES_IS_TRACK_ELEMENT (object), FALSE);
GST_DEBUG ("track:%p, object:%p", track, object);
if (G_UNLIKELY (ges_track_element_get_track (object) != NULL)) {
GST_WARNING ("Object already belongs to another track");
return FALSE;
}
if (G_UNLIKELY (!ges_track_element_set_track (object, track))) {
GST_ERROR ("Couldn't properly add the object to the Track");
return FALSE;
}
GST_DEBUG ("Adding object %s to ourself %s",
GST_OBJECT_NAME (ges_track_element_get_gnlobject (object)),
GST_OBJECT_NAME (track->priv->composition));
if (G_UNLIKELY (!gst_bin_add (GST_BIN (track->priv->composition),
ges_track_element_get_gnlobject (object)))) {
GST_WARNING ("Couldn't add object to the GnlComposition");
return FALSE;
}
gst_object_ref_sink (object);
g_hash_table_insert (track->priv->trackelements_iter, object,
g_sequence_insert_sorted (track->priv->trackelements_by_start, object,
(GCompareDataFunc) element_start_compare, NULL));
ges_timeline_element_set_timeline (GES_TIMELINE_ELEMENT (object),
track->priv->timeline);
g_signal_emit (track, ges_track_signals[TRACK_ELEMENT_ADDED], 0,
GES_TRACK_ELEMENT (object));
g_signal_connect (GES_TRACK_ELEMENT (object), "notify::start",
G_CALLBACK (sort_track_elements_cb), track);
g_signal_connect (GES_TRACK_ELEMENT (object), "notify::duration",
G_CALLBACK (sort_track_elements_cb), track);
g_signal_connect (GES_TRACK_ELEMENT (object), "notify::priority",
G_CALLBACK (sort_track_elements_cb), track);
return TRUE;
}
/**
* ges_track_get_elements:
* @track: a #GESTrack
*
* Gets the #GESTrackElement contained in @track
*
* Returns: (transfer full) (element-type GESTrackElement): the list of
* #GESTrackElement present in the Track sorted by priority and start.
*/
GList *
ges_track_get_elements (GESTrack * track)
{
GList *ret = NULL;
g_return_val_if_fail (GES_IS_TRACK (track), NULL);
g_sequence_foreach (track->priv->trackelements_by_start,
(GFunc) add_trackelement_to_list_foreach, &ret);
ret = g_list_reverse (ret);
return ret;
}
/**
* ges_track_remove_element:
* @track: a #GESTrack
* @object: the #GESTrackElement to remove
*
* Removes the object from the track and unparents it.
* Unparenting it means the reference owned by @track on the @object will be
* removed. If you wish to use the @object after this function, make sure you
* call gst_object_ref() before removing it from the @track.
*
* Returns: #TRUE if the object was removed, else #FALSE if the track
* could not remove the object (like if it didn't belong to the track).
*/
gboolean
ges_track_remove_element (GESTrack * track, GESTrackElement * object)
{
GSequenceIter *it;
GESTrackPrivate *priv;
g_return_val_if_fail (GES_IS_TRACK (track), FALSE);
g_return_val_if_fail (GES_IS_TRACK_ELEMENT (object), FALSE);
priv = track->priv;
GST_DEBUG_OBJECT (track, "Removing %" GST_PTR_FORMAT, object);
it = g_hash_table_lookup (priv->trackelements_iter, object);
g_sequence_remove (it);
resort_and_fill_gaps (track);
if (remove_object_internal (track, object) == TRUE) {
ges_timeline_element_set_timeline (GES_TIMELINE_ELEMENT (object), NULL);
return TRUE;
}
g_hash_table_insert (track->priv->trackelements_iter, object,
g_sequence_insert_sorted (track->priv->trackelements_by_start, object,
(GCompareDataFunc) element_start_compare, NULL));
return FALSE;
}
/**
* ges_track_get_caps:
* @track: a #GESTrack
*
* Get the #GstCaps this track is configured to output.
*
* Returns: The #GstCaps this track is configured to output.
*/
const GstCaps *
ges_track_get_caps (GESTrack * track)
{
g_return_val_if_fail (GES_IS_TRACK (track), NULL);
return track->priv->caps;
}
/**
* ges_track_get_timeline:
* @track: a #GESTrack
*
* Get the #GESTimeline this track belongs to. Can be %NULL.
*
* Returns: The #GESTimeline this track belongs to. Can be %NULL.
*/
const GESTimeline *
ges_track_get_timeline (GESTrack * track)
{
g_return_val_if_fail (GES_IS_TRACK (track), NULL);
return track->priv->timeline;
}
/**
* ges_track_get_mixing:
* @track: a #GESTrack
*
* Gets if the underlying #GnlComposition contains an expandable mixer.
*
* Returns: #True if there is a mixer, #False otherwise.
*/
gboolean
ges_track_get_mixing (GESTrack * track)
{
g_return_val_if_fail (GES_IS_TRACK (track), FALSE);
return track->priv->mixing;
}
/**
* ges_track_commit:
* @track: a #GESTrack
*
* Commits all the pending changes of the TrackElement contained in the
* track.
*
* When timing changes happen in a timeline, the changes are not
* directly done inside GNL. This method needs to be called so any changes
* on a clip contained in the timeline actually happen at the media
* processing level.
*
* Returns: %TRUE if something as been commited %FALSE if nothing needed
* to be commited
*/
gboolean
ges_track_commit (GESTrack * track)
{
gboolean ret;
g_return_val_if_fail (GES_IS_TRACK (track), FALSE);
resort_and_fill_gaps (track);
g_signal_emit_by_name (track->priv->composition, "commit", TRUE, &ret);
return ret;
}
/**
* ges_track_set_create_element_for_gap_func:
* @track: a #GESTrack
* @func: (scope notified): The #GESCreateElementForGapFunc that will be used
* to create #GstElement to fill gaps
*
* Sets the function that should be used to create the GstElement used to fill gaps.
* To avoid to provide such a function we advice you to use the
* #ges_audio_track_new and #ges_video_track_new constructor when possible.
*/
void
ges_track_set_create_element_for_gap_func (GESTrack * track,
GESCreateElementForGapFunc func)
{
g_return_if_fail (GES_IS_TRACK (track));
track->priv->create_element_for_gaps = func;
}