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/* GStreamer
* 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.
*/
/* This effect is borrowed from xmms-0.6.1, though I mangled it so badly in
* the process of copying it over that the xmms people probably won't want
* any credit for it ;-)
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gststereo.h>
/* elementfactory information */
static GstElementDetails stereo_details = GST_ELEMENT_DETAILS (
"Stereo effect",
"Filter/Effect/Audio",
"Muck with the stereo signal to enhance its 'stereo-ness'",
"Erik Walthinsen <omega@cse.ogi.edu>"
);
/* Stereo signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_ACTIVE,
ARG_STEREO
};
static void gst_stereo_base_init (gpointer g_class);
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, GstData *_data);
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),
gst_stereo_base_init,
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_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (element_class, &stereo_details);
}
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,GstData *_data)
{
GstBuffer *buf = GST_BUFFER (_data);
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,GST_DATA (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 (GstPlugin *plugin)
{
return gst_element_register (plugin, "stereo", GST_RANK_NONE, GST_TYPE_STEREO);
}
GST_PLUGIN_DEFINE (
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"stereo",
"Muck with the stereo signal, enhance it's 'stereo-ness'",
plugin_init,
VERSION,
GST_LICENSE,
GST_PACKAGE,
GST_ORIGIN
)
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