gstreamer/ges/ges-track-object.c

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/* GStreamer Editing Services
* Copyright (C) 2009 Edward Hervey <bilboed@bilboed.com>
*
* 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-object
* @short_description: Base Class for objects contained in a #GESTrack
*
* #GESTrackObject is the Base Class for any object that can be contained in a
* #GESTrack.
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*
* It contains the basic information as to the location of the object within
* its container, like the start position, the in-point, the duration and the
* priority.
*/
#include "ges-internal.h"
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#include "ges-track-object.h"
#include "ges-timeline-object.h"
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static GQuark _start_quark;
static GQuark _inpoint_quark;
static GQuark _duration_quark;
static GQuark _priority_quark;
#define _do_init \
{ \
_start_quark = g_quark_from_static_string ("start"); \
_inpoint_quark = g_quark_from_static_string ("inpoint"); \
_duration_quark = g_quark_from_static_string ("duration"); \
_priority_quark = g_quark_from_static_string ("priority"); \
}
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G_DEFINE_TYPE_WITH_CODE (GESTrackObject, ges_track_object, G_TYPE_OBJECT,
_do_init);
enum
{
PROP_0,
PROP_START,
PROP_INPOINT,
PROP_DURATION,
PROP_PRIORITY,
};
static gboolean
ges_track_object_create_gnl_object_func (GESTrackObject * object);
static void
ges_track_object_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
GESTrackObject *tobj = GES_TRACK_OBJECT (object);
switch (property_id) {
case PROP_START:
g_value_set_uint64 (value, tobj->start);
break;
case PROP_INPOINT:
g_value_set_uint64 (value, tobj->inpoint);
break;
case PROP_DURATION:
g_value_set_uint64 (value, tobj->duration);
break;
case PROP_PRIORITY:
g_value_set_uint (value, tobj->priority);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ges_track_object_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
GESTrackObject *tobj = GES_TRACK_OBJECT (object);
switch (property_id) {
case PROP_START:
ges_track_object_set_start_internal (tobj, g_value_get_uint64 (value));
break;
case PROP_INPOINT:
ges_track_object_set_inpoint_internal (tobj, g_value_get_uint64 (value));
break;
case PROP_DURATION:
ges_track_object_set_duration_internal (tobj, g_value_get_uint64 (value));
break;
case PROP_PRIORITY:
ges_track_object_set_priority_internal (tobj, g_value_get_uint (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ges_track_object_dispose (GObject * object)
{
G_OBJECT_CLASS (ges_track_object_parent_class)->dispose (object);
}
static void
ges_track_object_finalize (GObject * object)
{
G_OBJECT_CLASS (ges_track_object_parent_class)->finalize (object);
}
static void
ges_track_object_class_init (GESTrackObjectClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->get_property = ges_track_object_get_property;
object_class->set_property = ges_track_object_set_property;
object_class->dispose = ges_track_object_dispose;
object_class->finalize = ges_track_object_finalize;
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/**
* GESTrackObject:start
*
* The position of the object in the container #GESTrack (in nanoseconds).
*/
g_object_class_install_property (object_class, PROP_START,
g_param_spec_uint64 ("start", "Start",
"The position in the container", 0, G_MAXUINT64, 0,
G_PARAM_READWRITE));
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/**
* GESTrackObject:in-point
*
* The in-point at which this #GESTrackObject will start outputting data
* from its contents (in nanoseconds).
*
* Ex : an in-point of 5 seconds means that the first outputted buffer will
* be the one located 5 seconds in the controlled resource.
*/
g_object_class_install_property (object_class, PROP_INPOINT,
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g_param_spec_uint64 ("in-point", "In-point", "The in-point", 0,
G_MAXUINT64, 0, G_PARAM_READWRITE));
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/**
* GESTrackObject:duration
*
* The duration (in nanoseconds) which will be used in the container #GESTrack
* starting from 'in-point'.
*
*/
g_object_class_install_property (object_class, PROP_DURATION,
g_param_spec_uint64 ("duration", "Duration", "The duration to use",
0, G_MAXUINT64, GST_SECOND, G_PARAM_READWRITE));
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/**
* GESTrackObject:priority
*
* The priority of the object within the containing #GESTrack.
* If two objects intersect over the same region of time, the @priority
* property is used to decide which one takes precedence.
*
* The highest priority (that supercedes everything) is 0, and then lowering
* priorities go in increasing numerical value (with #G_MAXUINT64 being the
* lowest priority).
*/
g_object_class_install_property (object_class, PROP_PRIORITY,
g_param_spec_uint ("priority", "Priority",
"The priority of the object", 0, G_MAXUINT, 0, G_PARAM_READWRITE));
klass->create_gnl_object = ges_track_object_create_gnl_object_func;
}
static void
ges_track_object_init (GESTrackObject * self)
{
}
gboolean
ges_track_object_set_start_internal (GESTrackObject * object, guint64 start)
{
g_return_val_if_fail (object->gnlobject, FALSE);
GST_DEBUG ("object:%p, start:%" GST_TIME_FORMAT,
object, GST_TIME_ARGS (start));
if (G_UNLIKELY (start == object->start))
return FALSE;
g_object_set (object->gnlobject, "start", start, NULL);
return TRUE;
};
gboolean
ges_track_object_set_inpoint_internal (GESTrackObject * object, guint64 inpoint)
{
guint64 dur;
GST_DEBUG ("object:%p, inpoint:%" GST_TIME_FORMAT,
object, GST_TIME_ARGS (inpoint));
g_return_val_if_fail (object->gnlobject, FALSE);
if (G_UNLIKELY (inpoint == object->inpoint))
return FALSE;
/* Calculate new media-start/duration/media-duration */
dur = object->inpoint - inpoint + object->duration;
g_object_set (object->gnlobject, "media-start", inpoint, "duration", dur,
"media-duration", dur, NULL);
return TRUE;
}
gboolean
ges_track_object_set_duration_internal (GESTrackObject * object,
guint64 duration)
{
GST_DEBUG ("object:%p, duration:%" GST_TIME_FORMAT,
object, GST_TIME_ARGS (duration));
g_return_val_if_fail (object->gnlobject, FALSE);
if (G_UNLIKELY (duration == object->duration))
return FALSE;
g_object_set (object->gnlobject, "duration", duration, "media-duration",
duration, NULL);
return TRUE;
}
gboolean
ges_track_object_set_priority_internal (GESTrackObject * object,
guint32 priority)
{
GST_DEBUG ("object:%p, priority:%d", object, priority);
g_return_val_if_fail (object->gnlobject, FALSE);
if (G_UNLIKELY (priority == object->priority))
return FALSE;
g_object_set (object->gnlobject, "priority", priority, NULL);
return TRUE;
}
/* default 'create_gnl_object' virtual method implementation */
static gboolean
ges_track_object_create_gnl_object_func (GESTrackObject * object)
{
return FALSE;
}
static gboolean
ensure_gnl_object (GESTrackObject * object)
{
GESTrackObjectClass *class;
gboolean res;
if (object->gnlobject && object->valid)
return TRUE;
/* 1. Create the GnlObject */
GST_DEBUG ("Creating GnlObject");
class = GES_TRACK_OBJECT_GET_CLASS (object);
if (G_UNLIKELY (class->create_gnl_object == NULL)) {
GST_ERROR ("No 'create_gnl_object' implementation !");
return FALSE;
}
GST_DEBUG ("Calling virtual method");
/* call the create_gnl_object virtual method */
res = class->create_gnl_object (object);
if (G_UNLIKELY (res && (object->gnlobject == NULL))) {
GST_ERROR
("'create_gnl_object' implementation returned TRUE but no GnlObject is available");
return FALSE;
}
/* 2. Fill in the GnlObject */
if (res) {
GST_DEBUG ("Got a valid GnlObject, now filling it in");
res =
ges_timeline_object_fill_track_object (object->timelineobj, object,
object->gnlobject);
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if (res) {
/* Set some properties on the GnlObject */
g_object_set (object->gnlobject, "caps", object->track->caps, NULL);
}
}
object->valid = res;
GST_DEBUG ("Returning res:%d", res);
return res;
}
gboolean
ges_track_object_set_track (GESTrackObject * object, GESTrack * track)
{
GST_DEBUG ("object:%p, track:%p", object, track);
object->track = track;
if (object->track)
return ensure_gnl_object (object);
return TRUE;
}
void
ges_track_object_set_timeline_object (GESTrackObject * object,
GESTimelineObject * tlobj)
{
GST_DEBUG ("object:%p, timeline-object:%p", object, tlobj);
object->timelineobj = tlobj;
}