gstreamer/ges/ges-track.c
Thibault Saunier 6e0d6ba9c5 GESTrack: add a duration property
User can connect to the notify::duration signal if needed
2011-05-19 21:58:50 +02:00

507 lines
14 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:ges-track
* @short_description: Composition of objects
*
* Corresponds to one output format (i.e. audio OR video).
*
* Contains the compatible TrackObject(s).
*
* Wraps GNonLin's 'gnlcomposition' element.
*/
#include "ges-internal.h"
#include "ges-track.h"
#include "ges-track-object.h"
G_DEFINE_TYPE (GESTrack, ges_track, GST_TYPE_BIN);
struct _GESTrackPrivate
{
/*< private > */
GESTimeline *timeline;
GList *trackobjects;
guint64 duration;
GstCaps *caps;
GstElement *composition; /* The composition associated with this track */
GstPad *srcpad; /* The source GhostPad */
};
enum
{
ARG_0,
ARG_CAPS,
ARG_TYPE,
ARG_DURATION,
ARG_LAST
};
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);
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;
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;
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;
while (priv->trackobjects) {
GESTrackObject *trobj = GES_TRACK_OBJECT (priv->trackobjects->data);
ges_track_remove_object (track, trobj);
ges_timeline_object_release_track_object ((GESTimelineObject *)
ges_track_object_get_timeline_object (trobj), trobj);
}
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;
}
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_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;
/**
* GESTrack:caps
*
* Caps used to filter/choose the output stream. This is generally set to
* a generic set of caps like 'video/x-raw-rgb;video/x-raw-yuv' 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);
g_object_class_install_property (object_class, ARG_CAPS,
properties[ARG_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]);
}
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);
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);
if (!gst_bin_add (GST_BIN (self), self->priv->composition))
GST_ERROR ("Couldn't add composition to bin !");
}
/**
* ges_track_new:
* @type: The type of track
* @caps: 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;
track = g_object_new (GES_TYPE_TRACK, "caps", caps, "track-type", type, NULL);
gst_caps_unref (caps);
return track;
}
/**
* ges_track_video_raw_new:
*
* Creates a new #GESTrack of type #GES_TRACK_TYPE_VIDEO and with generic
* raw video caps ("video/x-raw-yuv;video/x-raw-rgb");
*
* Returns: A new #GESTrack.
*/
GESTrack *
ges_track_video_raw_new (void)
{
GESTrack *track;
GstCaps *caps = gst_caps_from_string ("video/x-raw-yuv;video/x-raw-rgb");
track = ges_track_new (GES_TRACK_TYPE_VIDEO, caps);
return track;
}
/**
* ges_track_audio_raw_new:
*
* Creates a new #GESTrack of type #GES_TRACK_TYPE_AUDIO and with generic
* raw audio caps ("audio/x-raw-int;audio/x-raw-float");
*
* Returns: A new #GESTrack.
*/
GESTrack *
ges_track_audio_raw_new (void)
{
GESTrack *track;
GstCaps *caps = gst_caps_from_string ("audio/x-raw-int;audio/x-raw-float");
track = ges_track_new (GES_TRACK_TYPE_AUDIO, 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;
}
/**
* 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));
g_return_if_fail (GST_IS_CAPS (caps));
GST_DEBUG ("track:%p, caps:%" GST_PTR_FORMAT, track, 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 trackobjects ? */
}
/**
* ges_track_add_object:
* @track: a #GESTrack
* @object: (transfer full): the #GESTrackObject 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_object (GESTrack * track, GESTrackObject * object)
{
g_return_val_if_fail (GES_IS_TRACK (track), FALSE);
g_return_val_if_fail (GES_IS_TRACK_OBJECT (object), FALSE);
GST_DEBUG ("track:%p, object:%p", track, object);
if (G_UNLIKELY (ges_track_object_get_track (object) != NULL)) {
GST_WARNING ("Object already belongs to another track");
return FALSE;
}
/* At this point, the track object shouldn't have any gnlobject since
* it hasn't been added to a track yet.
* FIXME : This check seems a bit obsolete */
if (G_UNLIKELY (ges_track_object_get_gnlobject (object) != NULL)) {
GST_ERROR ("TrackObject already controls a gnlobject !");
return FALSE;
}
if (G_UNLIKELY (!ges_track_object_set_track (object, track))) {
GST_ERROR ("Couldn't properly add the object to the Track");
return FALSE;
}
GST_DEBUG ("Adding object to ourself");
if (G_UNLIKELY (!gst_bin_add (GST_BIN (track->priv->composition),
ges_track_object_get_gnlobject (object)))) {
GST_WARNING ("Couldn't add object to the GnlComposition");
return FALSE;
}
g_object_ref_sink (object);
track->priv->trackobjects = g_list_append (track->priv->trackobjects, object);
return TRUE;
}
/**
* ges_track_remove_object:
* @track: a #GESTrack
* @object: the #GESTrackObject 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 g_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_object (GESTrack * track, GESTrackObject * object)
{
GESTrackPrivate *priv;
GstElement *gnlobject;
g_return_val_if_fail (GES_IS_TRACK (track), FALSE);
g_return_val_if_fail (GES_IS_TRACK_OBJECT (object), FALSE);
GST_DEBUG ("track:%p, object:%p", track, object);
priv = track->priv;
if (G_UNLIKELY (ges_track_object_get_track (object) != track)) {
GST_WARNING ("Object belongs to another track");
return FALSE;
}
if ((gnlobject = ges_track_object_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;
}
}
ges_track_object_set_track (object, NULL);
priv->trackobjects = g_list_remove (priv->trackobjects, object);
g_object_unref (object);
return TRUE;
}
static void
pad_added_cb (GstElement * element, GstPad * pad, GESTrack * track)
{
GESTrackPrivate *priv = track->priv;
GST_DEBUG ("track:%p, pad %s:%s", track, GST_DEBUG_PAD_NAME (pad));
/* ghost the pad */
priv->srcpad = gst_ghost_pad_new ("src", pad);
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 * obj)
{
guint64 duration;
g_object_get (composition, "duration", &duration, NULL);
if (obj->priv->duration != duration) {
GST_DEBUG ("composition duration : %" GST_TIME_FORMAT " current : %"
GST_TIME_FORMAT, GST_TIME_ARGS (duration),
GST_TIME_ARGS (obj->priv->duration));
obj->priv->duration = duration;
#if GLIB_CHECK_VERSION(2,26,0)
g_object_notify_by_pspec (G_OBJECT (obj), properties[ARG_DURATION]);
#else
g_object_notify (G_OBJECT (obj), "duration");
#endif
}
}
/**
* 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;
}