gstreamer/ges/ges-audio-track.c

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/* GStreamer Editing Services
* Copyright (C) <2013> Thibault Saunier <thibault.saunier@collabora.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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION: gesaudiotrack
* @title: GESAudioTrack
* @short_description: A standard GESTrack for raw audio
*
* Sane default properties to specify and fixate the output stream are
* set as restriction-caps.
* It is advised, to modify these properties, to use
* #ges_track_update_restriction_caps, setting them directly is
* possible through #ges_track_set_restriction_caps, but not specifying
* one of them can lead to negotiation issues, only use that function
* if you actually know what you're doing :)
*
* The default properties are:
* - format: S32LE
* - channels: 2
* - rate: 44100
* - layout: interleaved
*/
#include "ges-internal.h"
#include "ges-smart-adder.h"
#include "ges-audio-track.h"
#define DEFAULT_CAPS "audio/x-raw"
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
#define DEFAULT_RESTRICTION_CAPS "audio/x-raw, format=S32LE, channels=2, "\
"rate=44100, layout=interleaved"
#else
#define DEFAULT_RESTRICTION_CAPS "audio/x-raw, format=S32BE, channels=2, "\
"rate=44100, layout=interleaved"
#endif
struct _GESAudioTrackPrivate
{
gpointer nothing;
};
G_DEFINE_TYPE (GESAudioTrack, ges_audio_track, GES_TYPE_TRACK);
/****************************************************
* Private methods and utils *
****************************************************/
static GstElement *
create_element_for_raw_audio_gap (GESTrack * track)
{
GstElement *elem;
elem = gst_element_factory_make ("audiotestsrc", NULL);
g_object_set (elem, "wave", 4, NULL);
return elem;
}
/****************************************************
* GObject vmethods implementations *
****************************************************/
static void
ges_audio_track_init (GESAudioTrack * self)
{
self->priv = G_TYPE_INSTANCE_GET_PRIVATE ((self), GES_TYPE_AUDIO_TRACK,
GESAudioTrackPrivate);
}
static void
ges_audio_track_finalize (GObject * object)
{
/* TODO: Add deinitalization code here */
G_OBJECT_CLASS (ges_audio_track_parent_class)->finalize (object);
}
static void
ges_audio_track_class_init (GESAudioTrackClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
/* GESTrackClass *parent_class = GES_TRACK_CLASS (klass);
*/
g_type_class_add_private (klass, sizeof (GESAudioTrackPrivate));
object_class->finalize = ges_audio_track_finalize;
GES_TRACK_CLASS (klass)->get_mixing_element = ges_smart_adder_new;
}
/****************************************************
* API implementation *
****************************************************/
/**
* ges_audio_track_new:
*
* Creates a new #GESAudioTrack of type #GES_TRACK_TYPE_AUDIO and with generic
* raw audio caps ("audio/x-raw");
*
* Returns: (transfer floating): A new #GESTrack
*/
GESAudioTrack *
ges_audio_track_new (void)
{
GESAudioTrack *ret;
GstCaps *caps = gst_caps_from_string (DEFAULT_CAPS);
GstCaps *restriction_caps = gst_caps_from_string (DEFAULT_RESTRICTION_CAPS);
ret = g_object_new (GES_TYPE_AUDIO_TRACK, "caps", caps,
"track-type", GES_TRACK_TYPE_AUDIO, NULL);
ges_track_set_create_element_for_gap_func (GES_TRACK (ret),
create_element_for_raw_audio_gap);
ges_track_set_restriction_caps (GES_TRACK (ret), restriction_caps);
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gst_caps_unref (caps);
gst_caps_unref (restriction_caps);
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return ret;
}