gstreamer/ges/ges-source.c

141 lines
3.7 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:ges-source
* @short_description: Base Class for single-media sources
*/
#include "ges-internal.h"
#include "ges/ges-meta-container.h"
#include "ges-track-element.h"
#include "ges-source.h"
#include "ges-layer.h"
#include "gstframepositionner.h"
G_DEFINE_TYPE (GESSource, ges_source, GES_TYPE_TRACK_ELEMENT);
struct _GESSourcePrivate
{
/* Dummy variable */
GstFramePositionner *positionner;
};
/******************************
* Internal helper methods *
******************************/
static void
_pad_added_cb (GstElement * element, GstPad * srcpad, GstPad * sinkpad)
{
gst_element_no_more_pads (element);
gst_pad_link (srcpad, sinkpad);
}
static void
_ghost_pad_added_cb (GstElement * element, GstPad * srcpad, GstElement * bin)
{
GstPad *ghost;
ghost = gst_ghost_pad_new ("src", srcpad);
gst_pad_set_active (ghost, TRUE);
gst_element_add_pad (bin, ghost);
gst_element_no_more_pads (element);
}
GstElement *
ges_source_create_topbin (const gchar * bin_name, GstElement * sub_element, ...)
{
va_list argp;
GstElement *element;
GstElement *prev = NULL;
GstElement *first = NULL;
GstElement *bin;
GstPad *sub_srcpad;
va_start (argp, sub_element);
bin = gst_bin_new (bin_name);
gst_bin_add (GST_BIN (bin), sub_element);
while ((element = va_arg (argp, GstElement *)) != NULL) {
gst_bin_add (GST_BIN (bin), element);
if (prev)
gst_element_link (prev, element);
prev = element;
if (first == NULL)
first = element;
}
va_end (argp);
sub_srcpad = gst_element_get_static_pad (sub_element, "src");
if (prev != NULL) {
GstPad *srcpad, *sinkpad, *ghost;
srcpad = gst_element_get_static_pad (prev, "src");
ghost = gst_ghost_pad_new ("src", srcpad);
gst_pad_set_active (ghost, TRUE);
gst_element_add_pad (bin, ghost);
sinkpad = gst_element_get_static_pad (first, "sink");
if (sub_srcpad)
gst_pad_link (sub_srcpad, sinkpad);
else
g_signal_connect (sub_element, "pad-added", G_CALLBACK (_pad_added_cb),
sinkpad);
gst_object_unref (srcpad);
gst_object_unref (sinkpad);
} else if (sub_srcpad) {
GstPad *ghost;
ghost = gst_ghost_pad_new ("src", sub_srcpad);
gst_pad_set_active (ghost, TRUE);
gst_element_add_pad (bin, ghost);
} else {
g_signal_connect (sub_element, "pad-added",
G_CALLBACK (_ghost_pad_added_cb), bin);
}
if (sub_srcpad)
gst_object_unref (sub_srcpad);
return bin;
}
static void
ges_source_class_init (GESSourceClass * klass)
{
GESTrackElementClass *track_class = GES_TRACK_ELEMENT_CLASS (klass);
g_type_class_add_private (klass, sizeof (GESSourcePrivate));
track_class->gnlobject_factorytype = "gnlsource";
track_class->create_element = NULL;
}
static void
ges_source_init (GESSource * self)
{
self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
GES_TYPE_SOURCE, GESSourcePrivate);
}