gstreamer/ges/ges-audio-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-audio-source
* @short_description: Base Class for audio sources
*/
#include "ges-internal.h"
#include "ges/ges-meta-container.h"
#include "ges-track-element.h"
#include "ges-audio-source.h"
#include "ges-layer.h"
G_DEFINE_ABSTRACT_TYPE (GESAudioSource, ges_audio_source, GES_TYPE_SOURCE);
struct _GESAudioSourcePrivate
{
/* Dummy variable */
void *nothing;
};
static void
_sync_element_to_layer_property_float (GESTrackElement * trksrc,
GstElement * element, const gchar * meta, const gchar * propname)
{
GESTimelineElement *parent;
GESLayer *layer;
gfloat value;
parent = ges_timeline_element_get_parent (GES_TIMELINE_ELEMENT (trksrc));
layer = ges_clip_get_layer (GES_CLIP (parent));
gst_object_unref (parent);
if (layer != NULL) {
ges_meta_container_get_float (GES_META_CONTAINER (layer), meta, &value);
g_object_set (element, propname, value, NULL);
GST_DEBUG_OBJECT (trksrc, "Setting %s to %f", propname, value);
} else {
GST_DEBUG_OBJECT (trksrc, "NOT setting the %s", propname);
}
gst_object_unref (layer);
}
static GstElement *
ges_audio_source_create_element (GESTrackElement * trksrc)
{
GstElement *volume, *vbin;
GstElement *topbin;
GstElement *sub_element;
GESAudioSourceClass *source_class = GES_AUDIO_SOURCE_GET_CLASS (trksrc);
const gchar *props[] = { "volume", "mute", NULL };
if (!source_class->create_source)
return NULL;
sub_element = source_class->create_source (trksrc);
GST_DEBUG_OBJECT (trksrc, "Creating a bin sub_element ! volume");
vbin =
gst_parse_bin_from_description
("audioconvert ! audioresample ! volume name=v", TRUE, NULL);
topbin = ges_source_create_topbin ("audiosrcbin", sub_element, vbin, NULL);
volume = gst_bin_get_by_name (GST_BIN (vbin), "v");
_sync_element_to_layer_property_float (trksrc, volume, GES_META_VOLUME,
"volume");
ges_track_element_add_children_props (trksrc, volume, NULL, NULL, props);
gst_object_unref (volume);
return topbin;
}
static void
ges_audio_source_class_init (GESAudioSourceClass * klass)
{
GESTrackElementClass *track_class = GES_TRACK_ELEMENT_CLASS (klass);
GESAudioSourceClass *audio_source_class = GES_AUDIO_SOURCE_CLASS (klass);
g_type_class_add_private (klass, sizeof (GESAudioSourcePrivate));
track_class->gnlobject_factorytype = "gnlsource";
track_class->create_element = ges_audio_source_create_element;
audio_source_class->create_source = NULL;
}
static void
ges_audio_source_init (GESAudioSource * self)
{
self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
GES_TYPE_AUDIO_SOURCE, GESAudioSourcePrivate);
}