gstreamer/ges/ges-track.c

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/* GStreamer Editing Services
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* Copyright (C) 2009 Edward Hervey <edward.hervey@collabora.co.uk>
* 2009 Nokia Corporation
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*
* 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).
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*
* Contains the compatible TrackObject(s).
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*
* Wraps GNonLin's 'gnlcomposition' element.
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*/
#include "ges-internal.h"
#include "ges-track.h"
#include "ges-track-object.h"
G_DEFINE_TYPE (GESTrack, ges_track, GST_TYPE_BIN);
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enum
{
ARG_0,
ARG_CAPS,
ARG_TYPE
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};
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static void pad_added_cb (GstElement * element, GstPad * pad, GESTrack * track);
static void
pad_removed_cb (GstElement * element, GstPad * pad, GESTrack * track);
static void
ges_track_get_property (GObject * object, guint property_id,
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GValue * value, GParamSpec * pspec)
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{
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GESTrack *track = GES_TRACK (object);
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switch (property_id) {
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case ARG_CAPS:
gst_value_set_caps (value, track->caps);
break;
case ARG_TYPE:
g_value_set_flags (value, track->type);
break;
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default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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}
}
static void
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ges_track_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
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{
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GESTrack *track = GES_TRACK (object);
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switch (property_id) {
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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;
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default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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}
}
static void
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ges_track_dispose (GObject * object)
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{
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GESTrack *track = (GESTrack *) object;
/* FIXME : Remove all TrackObjects ! */
if (track->composition) {
gst_bin_remove (GST_BIN (object), track->composition);
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track->composition = NULL;
}
if (track->caps) {
gst_caps_unref (track->caps);
track->caps = NULL;
}
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G_OBJECT_CLASS (ges_track_parent_class)->dispose (object);
}
static void
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ges_track_finalize (GObject * object)
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{
G_OBJECT_CLASS (ges_track_parent_class)->finalize (object);
}
static void
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ges_track_class_init (GESTrackClass * klass)
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{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
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;
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/**
* 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.
*/
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g_object_class_install_property (object_class, 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));
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/**
* 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.
*/
g_object_class_install_property (object_class, 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));
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}
static void
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ges_track_init (GESTrack * self)
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{
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self->composition = gst_element_factory_make ("gnlcomposition", NULL);
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g_signal_connect (self->composition, "pad-added", (GCallback) pad_added_cb,
self);
g_signal_connect (self->composition, "pad-removed",
(GCallback) pad_removed_cb, self);
if (!gst_bin_add (GST_BIN (self), self->composition))
GST_ERROR ("Couldn't add composition to bin !");
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}
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/**
* 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.
*
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* Returns: A new #GESTrack.
*/
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GESTrack *
ges_track_new (GESTrackType type, GstCaps * caps)
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{
GESTrack *track;
track = g_object_new (GES_TYPE_TRACK, "caps", caps, "track-type", type, NULL);
gst_caps_unref (caps);
return track;
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}
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/**
* 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 *
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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;
}
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/**
* 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 *
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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;
}
void
ges_track_set_timeline (GESTrack * track, GESTimeline * timeline)
{
GST_DEBUG ("track:%p, timeline:%p", track, timeline);
track->timeline = timeline;
}
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/**
* ges_track_set_caps:
* @track: a #GESTrack
* @caps: the #GstCaps to set
*
* Sets the given @caps on the track.
*/
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void
ges_track_set_caps (GESTrack * track, const GstCaps * caps)
{
GST_DEBUG ("track:%p, caps:%" GST_PTR_FORMAT, track, caps);
g_return_if_fail (GST_IS_CAPS (caps));
if (track->caps)
gst_caps_unref (track->caps);
track->caps = gst_caps_copy (caps);
g_object_set (track->composition, "caps", caps, NULL);
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/* FIXME : update all trackobjects ? */
}
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/**
* ges_track_add_object:
* @track: a #GESTrack
* @object: the #GESTrackObject to add
*
* Adds the given object to the 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)
{
GST_DEBUG ("track:%p, object:%p", track, object);
if (G_UNLIKELY (object->track != NULL)) {
GST_WARNING ("Object already belongs to another track");
return FALSE;
}
if (G_UNLIKELY (object->gnlobject != NULL)) {
GST_ERROR ("TrackObject doesn't have a gnlobject !");
return FALSE;
}
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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");
/* make sure the object has a valid gnlobject ! */
if (G_UNLIKELY (!gst_bin_add (GST_BIN (track->composition),
object->gnlobject))) {
GST_WARNING ("Couldn't add object to the GnlComposition");
return FALSE;
}
return TRUE;
}
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/**
* ges_track_remove_object:
* @track: a #GESTrack
* @object: the #GESTrackObject to remove
*
* Removes the object 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).
*/
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gboolean
ges_track_remove_object (GESTrack * track, GESTrackObject * object)
{
GST_DEBUG ("track:%p, object:%p", track, object);
if (G_UNLIKELY (object->track != track)) {
GST_WARNING ("Object belongs to another track");
return FALSE;
}
if (G_LIKELY (object->gnlobject != NULL)) {
GST_DEBUG ("Removing GnlObject from composition");
if (!gst_bin_remove (GST_BIN (track->composition), object->gnlobject)) {
GST_WARNING ("Failed to remove gnlobject from composition");
return FALSE;
}
}
ges_track_object_set_track (object, NULL);
return TRUE;
}
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static void
pad_added_cb (GstElement * element, GstPad * pad, GESTrack * track)
{
GST_DEBUG ("track:%p, pad %s:%s", track, GST_DEBUG_PAD_NAME (pad));
/* ghost the pad */
track->srcpad = gst_ghost_pad_new ("src", pad);
gst_pad_set_active (track->srcpad, TRUE);
gst_element_add_pad (GST_ELEMENT (track), track->srcpad);
GST_DEBUG ("done");
}
static void
pad_removed_cb (GstElement * element, GstPad * pad, GESTrack * track)
{
GST_DEBUG ("track:%p, pad %s:%s", track, GST_DEBUG_PAD_NAME (pad));
if (G_LIKELY (track->srcpad)) {
gst_pad_set_active (track->srcpad, FALSE);
gst_element_remove_pad (GST_ELEMENT (track), track->srcpad);
track->srcpad = NULL;
}
GST_DEBUG ("done");
}