1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
/* Gnome-Streamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <gststereo.h>
static GstElementDetails stereo_details = {
"Stereo effect",
"Filter/Effect",
"Muck with the stereo signal, enhance it's 'stereo-ness'",
VERSION,
"Erik Walthinsen <omega@cse.ogi.edu>",
"(C) 1999",
};
/* Stereo signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_ACTIVE,
ARG_STEREO
};
static void gst_stereo_class_init (GstStereoClass *klass);
static void gst_stereo_init (GstStereo *stereo);
static void gst_stereo_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
static void gst_stereo_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
static void gst_stereo_chain (GstPad *pad, GstBuffer *buf);
static GstElementClass *parent_class = NULL;
//static guint gst_stereo_signals[LAST_SIGNAL] = { 0 };
GType
gst_stereo_get_type(void) {
static GType stereo_type = 0;
if (!stereo_type) {
static const GTypeInfo stereo_info = {
sizeof(GstStereoClass), NULL,
NULL,
(GClassInitFunc)gst_stereo_class_init,
NULL,
NULL,
sizeof(GstStereo),
0,
(GInstanceInitFunc)gst_stereo_init,
};
stereo_type = g_type_register_static(GST_TYPE_ELEMENT, "GstStereo", &stereo_info, 0);
}
return stereo_type;
}
static void
gst_stereo_class_init (GstStereoClass *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_ACTIVE,
g_param_spec_int("active","active","active",
G_MININT,G_MAXINT,0,G_PARAM_READWRITE)); // CHECKME
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_STEREO,
g_param_spec_float("stereo","stereo","stereo",
0.0,1.0,0.0,G_PARAM_READWRITE)); // CHECKME
gobject_class->set_property = gst_stereo_set_property;
gobject_class->get_property = gst_stereo_get_property;
}
static void
gst_stereo_init (GstStereo *stereo)
{
stereo->sinkpad = gst_pad_new("sink",GST_PAD_SINK);
gst_element_add_pad(GST_ELEMENT(stereo),stereo->sinkpad);
gst_pad_set_chain_function(stereo->sinkpad,gst_stereo_chain);
stereo->srcpad = gst_pad_new("src",GST_PAD_SRC);
gst_element_add_pad(GST_ELEMENT(stereo),stereo->srcpad);
stereo->active = FALSE;
stereo->stereo = 2.5;
}
static void
gst_stereo_chain (GstPad *pad,GstBuffer *buf)
{
GstStereo *stereo;
gint16 *data;
gint samples;
gint i;
gdouble avg,ldiff,rdiff,tmp,mul;
g_return_if_fail(pad != NULL);
g_return_if_fail(GST_IS_PAD(pad));
g_return_if_fail(buf != NULL);
stereo = GST_STEREO(GST_OBJECT_PARENT (pad));
g_return_if_fail(stereo != NULL);
g_return_if_fail(GST_IS_STEREO(stereo));
// FIXME
// if (buf->meta)
// memcpy(&stereo->meta,buf->meta,sizeof(stereo->meta));
if (stereo->active) {
//if (stereo->meta.channels == 2 && stereo->meta.format == AFMT_S16_LE) {
data = (gint16 *)GST_BUFFER_DATA(buf);
samples = GST_BUFFER_SIZE(buf) / 2;
mul = stereo->stereo;
for (i = 0; i < samples / 2; i += 2) {
avg = (data[i] + data[i + 1]) / 2;
ldiff = data[i] - avg;
rdiff = data[i + 1] - avg;
tmp = avg + ldiff * mul;
if (tmp < -32768)
tmp = -32768;
if (tmp > 32767)
tmp = 32767;
data[i] = tmp;
tmp = avg + rdiff * mul;
if (tmp < -32768)
tmp = -32768;
if (tmp > 32767)
tmp = 32767;
data[i + 1] = tmp;
}
//}
}
gst_pad_push(stereo->srcpad,buf);
}
static void
gst_stereo_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
GstStereo *stereo;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail(GST_IS_STEREO(object));
stereo = GST_STEREO(object);
switch (prop_id) {
case ARG_ACTIVE:
stereo->active = g_value_get_int (value);
break;
case ARG_STEREO:
stereo->stereo = g_value_get_float (value) * 10.0;
break;
default:
break;
}
}
static void
gst_stereo_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
GstStereo *stereo;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail(GST_IS_STEREO(object));
stereo = GST_STEREO(object);
switch (prop_id) {
case ARG_ACTIVE:
g_value_set_int (value, stereo->active);
break;
case ARG_STEREO:
g_value_set_float (value, stereo->stereo / 10.0);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
plugin_init (GModule *module, GstPlugin *plugin)
{
GstElementFactory *factory;
factory = gst_elementfactory_new("stereo",GST_TYPE_STEREO,
&stereo_details);
g_return_val_if_fail(factory != NULL, FALSE);
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
return TRUE;
}
GstPluginDesc plugin_desc = {
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"stereo",
plugin_init
};
|
