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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 ;-)
*/
/**
* SECTION:element-stereo
*
* Create a wide stereo effect.
*
* <refsect2>
* <title>Example pipelines</title>
* |[
* gst-launch -v filesrc location=sine.ogg ! oggdemux ! vorbisdec ! audioconvert ! stereo ! audioconvert ! audioresample ! alsasink
* ]| Play an Ogg/Vorbis file.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gststereo.h"
#include <gst/gst.h>
#include <gst/base/gstbasetransform.h>
#include <gst/audio/audio.h>
#include <gst/audio/gstaudiofilter.h>
#include <gst/controller/gstcontroller.h>
#define ALLOWED_CAPS \
"audio/x-raw-int," \
" depth = (int) 16, " \
" width = (int) 16, " \
" endianness = (int) BYTE_ORDER," \
" rate = (int) [ 1, MAX ]," \
" channels = (int) 2, " \
" signed = (boolean) TRUE"
/* Stereo signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_ACTIVE,
ARG_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 GstFlowReturn gst_stereo_transform_ip (GstBaseTransform * base,
GstBuffer * outbuf);
/*static guint gst_stereo_signals[LAST_SIGNAL] = { 0 }; */
GST_BOILERPLATE (GstStereo, gst_stereo, GstAudioFilter, GST_TYPE_AUDIO_FILTER);
static void
gst_stereo_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
GstCaps *caps;
gst_element_class_set_metadata (element_class, "Stereo effect",
"Filter/Effect/Audio",
"Muck with the stereo signal to enhance its 'stereo-ness'",
"Erik Walthinsen <omega@cse.ogi.edu>");
caps = gst_caps_from_string (ALLOWED_CAPS);
gst_audio_filter_class_add_pad_templates (GST_AUDIO_FILTER_CLASS (g_class),
caps);
gst_caps_unref (caps);
}
static void
gst_stereo_class_init (GstStereoClass * klass)
{
GObjectClass *gobject_class;
GstBaseTransformClass *trans_class;
gobject_class = (GObjectClass *) klass;
trans_class = (GstBaseTransformClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_stereo_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_stereo_get_property);
g_object_class_install_property (gobject_class, ARG_ACTIVE,
g_param_spec_boolean ("active", "active", "active",
TRUE,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, ARG_STEREO,
g_param_spec_float ("stereo", "stereo", "stereo",
0.0, 1.0, 0.1,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
trans_class->transform_ip = GST_DEBUG_FUNCPTR (gst_stereo_transform_ip);
}
static void
gst_stereo_init (GstStereo * stereo, GstStereoClass * klass)
{
stereo->active = TRUE;
stereo->stereo = 0.1;
}
static GstFlowReturn
gst_stereo_transform_ip (GstBaseTransform * base, GstBuffer * outbuf)
{
GstStereo *stereo = GST_STEREO (base);
gint16 *data = (gint16 *) GST_BUFFER_DATA (outbuf);
gint samples = GST_BUFFER_SIZE (outbuf) / 2;
gint i;
gdouble avg, ldiff, rdiff, tmp;
gdouble mul = stereo->stereo;
if (!gst_buffer_is_writable (outbuf))
return GST_FLOW_OK;
if (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_TIMESTAMP (outbuf)))
gst_object_sync_values (GST_OBJECT (stereo), GST_BUFFER_TIMESTAMP (outbuf));
if (stereo->active) {
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;
}
}
return GST_FLOW_OK;
}
static void
gst_stereo_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstStereo *stereo;
g_return_if_fail (GST_IS_STEREO (object));
stereo = GST_STEREO (object);
switch (prop_id) {
case ARG_ACTIVE:
stereo->active = g_value_get_boolean (value);
break;
case ARG_STEREO:
stereo->stereo = g_value_get_float (value) * 10.0;
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_stereo_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstStereo *stereo;
g_return_if_fail (GST_IS_STEREO (object));
stereo = GST_STEREO (object);
switch (prop_id) {
case ARG_ACTIVE:
g_value_set_boolean (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_NAME, GST_PACKAGE_ORIGIN)
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