gstreamer/gst/stereo/gststereo.c

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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)