1 /* GStreamer
2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2001 Thomas <thomas@apestaart.org>
4 * 2005,2006 Wim Taymans <wim@fluendo.com>
5 * 2013 Sebastian Dröge <sebastian@centricular.com>
6 * Copyright (C) 2020 Huawei Technologies Co., Ltd.
7 * @Author: Stéphane Cerveau <scerveau@collabora.com>
8 *
9 * audiomixer.c: AudioMixer element, N in, one out, samples are added
10 *
11 * This library is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU Library General Public
13 * License as published by the Free Software Foundation; either
14 * version 2 of the License, or (at your option) any later version.
15 *
16 * This library is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * Library General Public License for more details.
20 *
21 * You should have received a copy of the GNU Library General Public
22 * License along with this library; if not, write to the
23 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
24 * Boston, MA 02110-1301, USA.
25 */
26 /**
27 * SECTION:element-liveadder
28 * @title: liveadder
29 *
30 *
31 *
32 */
33
34 #ifdef HAVE_CONFIG_H
35 #include "config.h"
36 #endif
37
38 #include "gstaudiomixerelements.h"
39 #include "gstaudiomixerorc.h"
40
41 #include "gstaudiointerleave.h"
42
43 /* Empty liveadder alias with non-zero latency */
44
45 typedef GstAudioMixer GstLiveAdder;
46 typedef GstAudioMixerClass GstLiveAdderClass;
47
48 static GType gst_live_adder_get_type (void);
49 #define GST_TYPE_LIVE_ADDER gst_live_adder_get_type ()
50
51 G_DEFINE_TYPE (GstLiveAdder, gst_live_adder, GST_TYPE_AUDIO_MIXER);
52 GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (liveadder, "liveadder",
53 GST_RANK_NONE, GST_TYPE_LIVE_ADDER, audiomixer_element_init (plugin));
54
55 enum
56 {
57 LIVEADDER_PROP_LATENCY = 1
58 };
59
60 static void
gst_live_adder_init(GstLiveAdder * self)61 gst_live_adder_init (GstLiveAdder * self)
62 {
63 }
64
65 static void
gst_live_adder_set_property(GObject * object,guint prop_id,const GValue * value,GParamSpec * pspec)66 gst_live_adder_set_property (GObject * object, guint prop_id,
67 const GValue * value, GParamSpec * pspec)
68 {
69 switch (prop_id) {
70 case LIVEADDER_PROP_LATENCY:
71 {
72 GParamSpec *parent_spec =
73 g_object_class_find_property (G_OBJECT_CLASS
74 (gst_live_adder_parent_class), "latency");
75 GObjectClass *pspec_class = g_type_class_peek (parent_spec->owner_type);
76 GValue v = { 0 };
77
78 g_value_init (&v, G_TYPE_UINT64);
79
80 g_value_set_uint64 (&v, g_value_get_uint (value) * GST_MSECOND);
81
82 G_OBJECT_CLASS (pspec_class)->set_property (object,
83 parent_spec->param_id, &v, parent_spec);
84 break;
85 }
86 default:
87 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
88 break;
89 }
90 }
91
92 static void
gst_live_adder_get_property(GObject * object,guint prop_id,GValue * value,GParamSpec * pspec)93 gst_live_adder_get_property (GObject * object, guint prop_id, GValue * value,
94 GParamSpec * pspec)
95 {
96 switch (prop_id) {
97 case LIVEADDER_PROP_LATENCY:
98 {
99 GParamSpec *parent_spec =
100 g_object_class_find_property (G_OBJECT_CLASS
101 (gst_live_adder_parent_class), "latency");
102 GObjectClass *pspec_class = g_type_class_peek (parent_spec->owner_type);
103 GValue v = { 0 };
104
105 g_value_init (&v, G_TYPE_UINT64);
106
107 G_OBJECT_CLASS (pspec_class)->get_property (object,
108 parent_spec->param_id, &v, parent_spec);
109
110 g_value_set_uint (value, g_value_get_uint64 (&v) / GST_MSECOND);
111 break;
112 }
113 default:
114 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
115 break;
116 }
117 }
118
119 static void
gst_live_adder_class_init(GstLiveAdderClass * klass)120 gst_live_adder_class_init (GstLiveAdderClass * klass)
121 {
122 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
123
124 gobject_class->set_property = gst_live_adder_set_property;
125 gobject_class->get_property = gst_live_adder_get_property;
126
127 g_object_class_install_property (gobject_class, LIVEADDER_PROP_LATENCY,
128 g_param_spec_uint ("latency", "Buffer latency",
129 "Additional latency in live mode to allow upstream "
130 "to take longer to produce buffers for the current "
131 "position (in milliseconds)", 0, G_MAXUINT,
132 30, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_CONSTRUCT));
133 }
134