gstreamer/subprojects/gst-plugins-base/gst/audiomixer/gstliveadder.c

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2001 Thomas <thomas@apestaart.org>
* 2005,2006 Wim Taymans <wim@fluendo.com>
* 2013 Sebastian Dröge <sebastian@centricular.com>
* Copyright (C) 2020 Huawei Technologies Co., Ltd.
* @Author: Stéphane Cerveau <scerveau@collabora.com>
*
* audiomixer.c: AudioMixer element, N in, one out, samples are added
*
* 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:element-liveadder
* @title: liveadder
*
*
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstaudiomixerelements.h"
#include "gstaudiomixerorc.h"
#include "gstaudiointerleave.h"
/* Empty liveadder alias with non-zero latency */
typedef GstAudioMixer GstLiveAdder;
typedef GstAudioMixerClass GstLiveAdderClass;
static GType gst_live_adder_get_type (void);
#define GST_TYPE_LIVE_ADDER gst_live_adder_get_type ()
G_DEFINE_TYPE (GstLiveAdder, gst_live_adder, GST_TYPE_AUDIO_MIXER);
GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (liveadder, "liveadder",
GST_RANK_NONE, GST_TYPE_LIVE_ADDER, audiomixer_element_init (plugin));
enum
{
LIVEADDER_PROP_LATENCY = 1
};
static void
gst_live_adder_init (GstLiveAdder * self)
{
}
static void
gst_live_adder_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
switch (prop_id) {
case LIVEADDER_PROP_LATENCY:
{
GParamSpec *parent_spec =
g_object_class_find_property (G_OBJECT_CLASS
(gst_live_adder_parent_class), "latency");
GObjectClass *pspec_class = g_type_class_peek (parent_spec->owner_type);
GValue v = { 0 };
g_value_init (&v, G_TYPE_UINT64);
g_value_set_uint64 (&v, g_value_get_uint (value) * GST_MSECOND);
G_OBJECT_CLASS (pspec_class)->set_property (object,
parent_spec->param_id, &v, parent_spec);
break;
}
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_live_adder_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
switch (prop_id) {
case LIVEADDER_PROP_LATENCY:
{
GParamSpec *parent_spec =
g_object_class_find_property (G_OBJECT_CLASS
(gst_live_adder_parent_class), "latency");
GObjectClass *pspec_class = g_type_class_peek (parent_spec->owner_type);
GValue v = { 0 };
g_value_init (&v, G_TYPE_UINT64);
G_OBJECT_CLASS (pspec_class)->get_property (object,
parent_spec->param_id, &v, parent_spec);
g_value_set_uint (value, g_value_get_uint64 (&v) / GST_MSECOND);
break;
}
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_live_adder_class_init (GstLiveAdderClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->set_property = gst_live_adder_set_property;
gobject_class->get_property = gst_live_adder_get_property;
g_object_class_install_property (gobject_class, LIVEADDER_PROP_LATENCY,
g_param_spec_uint ("latency", "Buffer latency",
"Additional latency in live mode to allow upstream "
"to take longer to produce buffers for the current "
"position (in milliseconds)", 0, G_MAXUINT,
30, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_CONSTRUCT));
}