gstreamer/ges/ges-video-source.c

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/* 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:ges-video-source
* @short_description: Base Class for video sources
*/
#include "ges-internal.h"
#include "ges/ges-meta-container.h"
#include "ges-track-element.h"
#include "ges-video-source.h"
#include "ges-layer.h"
#include "gstframepositionner.h"
G_DEFINE_ABSTRACT_TYPE (GESVideoSource, ges_video_source, GES_TYPE_SOURCE);
struct _GESVideoSourcePrivate
{
GstFramePositionner *positionner;
GstElement *capsfilter;
GESLayer *layer;
};
/* TrackElement VMethods */
static void
layer_priority_changed_cb (GESLayer * layer, GParamSpec * arg G_GNUC_UNUSED,
GESVideoSource * self)
{
g_object_set (self->priv->positionner, "zorder",
10000 - ges_layer_get_priority (layer), NULL);
}
static void
layer_changed_cb (GESClip * clip, GParamSpec * arg G_GNUC_UNUSED,
GESVideoSource * self)
{
GESVideoSourcePrivate *priv = self->priv;
if (priv->layer) {
g_signal_handlers_disconnect_by_func (priv->layer,
layer_priority_changed_cb, self);
}
priv->layer = ges_clip_get_layer (clip);
if (priv->layer == NULL)
return;
/* We do not need any ref ourself as our parent owns one and we are connected
* to it */
g_object_unref (priv->layer);
/* 10000 is the max value of zorder on videomixerpad, hardcoded */
g_signal_connect (self->priv->layer, "notify::priority",
G_CALLBACK (layer_priority_changed_cb), self);
g_object_set (self->priv->positionner, "zorder",
10000 - ges_layer_get_priority (self->priv->layer), NULL);
}
static GstElement *
ges_video_source_create_element (GESTrackElement * trksrc)
{
GstElement *topbin;
GstElement *sub_element;
GESVideoSourceClass *source_class = GES_VIDEO_SOURCE_GET_CLASS (trksrc);
GESVideoSource *self;
GstElement *positionner, *videoscale, *videorate, *capsfilter;
const gchar *props[] = { "alpha", "posx", "posy", "width", "height", NULL };
GESTimelineElement *parent;
if (!source_class->create_source)
return NULL;
sub_element = source_class->create_source (trksrc);
self = (GESVideoSource *) trksrc;
/* That positionner will add metadata to buffers according to its
properties, acting like a proxy for our smart-mixer dynamic pads. */
positionner = gst_element_factory_make ("framepositionner", "frame_tagger");
videoscale =
gst_element_factory_make ("videoscale", "track-element-videoscale");
videorate = gst_element_factory_make ("videorate", "track-element-videorate");
capsfilter =
gst_element_factory_make ("capsfilter", "track-element-capsfilter");
ges_frame_positionner_set_source_and_filter (GST_FRAME_POSITIONNER
(positionner), trksrc, capsfilter);
ges_track_element_add_children_props (trksrc, positionner, NULL, NULL, props);
topbin =
ges_source_create_topbin ("videosrcbin", sub_element, positionner,
videoscale, videorate, capsfilter, NULL);
parent = ges_timeline_element_get_parent (GES_TIMELINE_ELEMENT (trksrc));
if (parent) {
self->priv->positionner = GST_FRAME_POSITIONNER (positionner);
g_signal_connect (parent, "notify::layer",
(GCallback) layer_changed_cb, trksrc);
layer_changed_cb (GES_CLIP (parent), NULL, self);
gst_object_unref (parent);
} else {
GST_ERROR ("No parent timeline element, SHOULD NOT HAPPEN");
}
self->priv->capsfilter = capsfilter;
return topbin;
}
static gboolean
_set_parent (GESTimelineElement * self, GESTimelineElement * parent)
{
GESVideoSourcePrivate *priv = GES_VIDEO_SOURCE (self)->priv;
if (self->parent) {
if (priv->layer) {
g_signal_handlers_disconnect_by_func (priv->layer,
layer_priority_changed_cb, self);
priv->layer = NULL;
}
g_signal_handlers_disconnect_by_func (self->parent, layer_changed_cb, self);
}
if (parent && priv->positionner)
layer_changed_cb (GES_CLIP (parent), NULL, GES_VIDEO_SOURCE (self));
return TRUE;
}
static void
ges_video_source_class_init (GESVideoSourceClass * klass)
{
GESTrackElementClass *track_class = GES_TRACK_ELEMENT_CLASS (klass);
GESTimelineElementClass *element_class = GES_TIMELINE_ELEMENT_CLASS (klass);
GESVideoSourceClass *video_source_class = GES_VIDEO_SOURCE_CLASS (klass);
g_type_class_add_private (klass, sizeof (GESVideoSourcePrivate));
element_class->set_parent = _set_parent;
track_class->gnlobject_factorytype = "gnlsource";
track_class->create_element = ges_video_source_create_element;
video_source_class->create_source = NULL;
}
static void
ges_video_source_init (GESVideoSource * self)
{
self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
GES_TYPE_VIDEO_SOURCE, GESVideoSourcePrivate);
self->priv->positionner = NULL;
self->priv->capsfilter = NULL;
}