Commit 55e73f93 authored by Mathis Hofer's avatar Mathis Hofer Committed by Wim Taymans

Ported the gstfilter plugin to GStreamer 0.10.

Original commit message from CVS:
Patch by: Mathis Hofer <mathis dot hofer at dreamlab dot net>
* configure.ac:
* gst/filter/Makefile.am:
* gst/filter/gstbpwsinc.c: (gst_bpwsinc_dispose),
(gst_bpwsinc_base_init), (gst_bpwsinc_class_init),
(gst_bpwsinc_init), (bpwsinc_set_caps), (bpwsinc_transform_ip),
(bpwsinc_set_property), (bpwsinc_get_property):
* gst/filter/gstfilter.c: (plugin_init):
* gst/filter/gstfilter.h:
* gst/filter/gstiir.c: (gst_iir_dispose), (gst_iir_base_init),
(gst_iir_class_init), (gst_iir_init), (iir_set_caps),
(iir_transform_ip), (iir_set_property), (iir_get_property):
* gst/filter/gstlpwsinc.c: (gst_lpwsinc_dispose),
(gst_lpwsinc_base_init), (gst_lpwsinc_class_init),
(gst_lpwsinc_init), (lpwsinc_set_caps), (lpwsinc_transform_ip),
(lpwsinc_set_property), (lpwsinc_get_property):
Ported the gstfilter plugin to GStreamer 0.10.
parent 94be718c
/* -*- c-basic-offset: 2 -*-
*
* GStreamer
* Copyright (C) 1999-2001 Erik Walthinsen <omega@cse.ogi.edu>
* 2006 Dreamlab Technologies Ltd. <mathis.hofer@dreamlab.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
......@@ -16,15 +18,14 @@
* 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 windowed sinc filter is taken from the freely downloadable DSP book,
*
*
* this windowed sinc filter is taken from the freely downloadable DSP book,
* "The Scientist and Engineer's Guide to Digital Signal Processing",
* chapter 16
* available at http://www.dspguide.com/
*/
/* FIXME:
*
* FIXME:
* - this filter is totally unoptimized !
* - we do not destroy the allocated memory for filters and residue
* - this might be improved upon with bytestream
......@@ -33,18 +34,27 @@
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <math.h>
#include <gst/gst.h>
#include "gstfilter.h"
#include <math.h> /* M_PI */
#include <string.h> /* memmove */
#include <gst/base/gstbasetransform.h>
#include <gst/controller/gstcontroller.h>
/* elementfactory information */
static const GstElementDetails gst_bpwsinc_details =
GST_ELEMENT_DETAILS ("BPWSinc",
#include "gstbpwsinc.h"
#define GST_CAT_DEFAULT gst_bpwsinc_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
static const GstElementDetails bpwsinc_details =
GST_ELEMENT_DETAILS ("Band-pass Windowed sinc filter",
"Filter/Effect/Audio",
"Band-Pass Windowed sinc filter",
"Thomas <thomas@apestaart.org>, " "Steven W. Smith");
"Band-pass Windowed sinc filter",
"Thomas <thomas@apestaart.org>, "
"Steven W. Smith, "
"Dreamlab Technologies Ltd. <mathis.hofer@dreamlab.net>");
/* Filter signals and args */
enum
{
/* FILL ME */
......@@ -53,82 +63,54 @@ enum
enum
{
ARG_0,
ARG_LENGTH,
ARG_LOWER_FREQUENCY,
ARG_UPPER_FREQUENCY
};
#define GST_TYPE_BPWSINC \
(gst_bpwsinc_get_type())
#define GST_BPWSINC(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BPWSINC,GstBPWSinc))
#define GST_BPWSINC_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ULAW,GstBPWSinc))
#define GST_IS_BPWSINC(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BPWSINC))
#define GST_IS_BPWSINC_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BPWSINC))
typedef struct _GstBPWSinc GstBPWSinc;
typedef struct _GstBPWSincClass GstBPWSincClass;
struct _GstBPWSinc
{
GstElement element;
GstPad *sinkpad, *srcpad;
double frequency;
double lower_frequency, upper_frequency;
int wing_size; /* length of a "wing" of the filter;
actual length is 2 * wing_size + 1 */
gfloat *residue; /* buffer for left-over samples from previous buffer */
double *kernel;
};
struct _GstBPWSincClass
{
GstElementClass parent_class;
PROP_0,
PROP_LENGTH,
PROP_LOWER_FREQUENCY,
PROP_UPPER_FREQUENCY
};
static void gst_bpwsinc_base_init (gpointer g_class);
static void gst_bpwsinc_class_init (GstBPWSincClass * klass);
static void gst_bpwsinc_init (GstBPWSinc * filter);
static void gst_bpwsinc_set_property (GObject * object, guint prop_id,
static GstStaticPadTemplate bpwsinc_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-raw-float, "
"rate = (int) [ 1, MAX ], "
"channels = (int) [ 1, MAX ], "
"endianness = (int) BYTE_ORDER, " "width = (int) 32")
);
static GstStaticPadTemplate bpwsinc_src_template = GST_STATIC_PAD_TEMPLATE
("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-raw-float, "
"rate = (int) [ 1, MAX ], "
"channels = (int) [ 1, MAX ], "
"endianness = (int) BYTE_ORDER, " "width = (int) 32")
);
#define DEBUG_INIT(bla) \
GST_DEBUG_CATEGORY_INIT (gst_bpwsinc_debug, "bpwsinc", 0, "Band-pass Windowed sinc filter plugin");
GST_BOILERPLATE_FULL (GstBPWSinc, gst_bpwsinc, GstBaseTransform,
GST_TYPE_BASE_TRANSFORM, DEBUG_INIT);
static void bpwsinc_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_bpwsinc_get_property (GObject * object, guint prop_id,
static void bpwsinc_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_bpwsinc_chain (GstPad * pad, GstData * _data);
static GstPadLinkReturn
gst_bpwsinc_sink_connect (GstPad * pad, const GstCaps * caps);
static GstElementClass *parent_class = NULL;
static GstFlowReturn bpwsinc_transform_ip (GstBaseTransform * base,
GstBuffer * outbuf);
static gboolean bpwsinc_set_caps (GstBaseTransform * base, GstCaps * incaps,
GstCaps * outcaps);
/*static guint gst_bpwsinc_signals[LAST_SIGNAL] = { 0 }; */
/* Element class */
GType
gst_bpwsinc_get_type (void)
static void
gst_bpwsinc_dispose (GObject * object)
{
static GType bpwsinc_type = 0;
if (!bpwsinc_type) {
static const GTypeInfo bpwsinc_info = {
sizeof (GstBPWSincClass),
gst_bpwsinc_base_init,
NULL,
(GClassInitFunc) gst_bpwsinc_class_init, NULL, NULL,
sizeof (GstBPWSinc), 0,
(GInstanceInitFunc) gst_bpwsinc_init,
};
bpwsinc_type = g_type_register_static (GST_TYPE_ELEMENT, "GstBPWSinc",
&bpwsinc_info, 0);
}
return bpwsinc_type;
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
......@@ -136,195 +118,181 @@ gst_bpwsinc_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
/* register src pads */
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_filter_src_template));
gst_static_pad_template_get (&bpwsinc_src_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_filter_sink_template));
gst_element_class_set_details (element_class, &gst_bpwsinc_details);
gst_static_pad_template_get (&bpwsinc_sink_template));
gst_element_class_set_details (element_class, &bpwsinc_details);
}
static void
gst_bpwsinc_class_init (GstBPWSincClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstBaseTransformClass *trans_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
trans_class = (GstBaseTransformClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_class->set_property = bpwsinc_set_property;
gobject_class->get_property = bpwsinc_get_property;
gobject_class->dispose = gst_bpwsinc_dispose;
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_LOWER_FREQUENCY,
g_object_class_install_property (gobject_class, PROP_LOWER_FREQUENCY,
g_param_spec_double ("lower-frequency", "Lower Frequency",
"Cut-off lower frequency (relative to sample rate)",
0.0, 0.5, 0, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_UPPER_FREQUENCY,
g_object_class_install_property (gobject_class, PROP_UPPER_FREQUENCY,
g_param_spec_double ("upper-frequency", "Upper Frequency",
"Cut-off upper frequency (relative to sample rate)",
0.0, 0.5, 0, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_LENGTH,
g_object_class_install_property (gobject_class, PROP_LENGTH,
g_param_spec_int ("length", "Length",
"N such that the filter length = 2N + 1",
1, G_MAXINT, 1, G_PARAM_READWRITE));
gobject_class->set_property = gst_bpwsinc_set_property;
gobject_class->get_property = gst_bpwsinc_get_property;
trans_class->transform_ip = GST_DEBUG_FUNCPTR (bpwsinc_transform_ip);
trans_class->set_caps = GST_DEBUG_FUNCPTR (bpwsinc_set_caps);
}
static void
gst_bpwsinc_init (GstBPWSinc * filter)
gst_bpwsinc_init (GstBPWSinc * this, GstBPWSincClass * g_class)
{
filter->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&gst_filter_sink_template), "sink");
gst_pad_set_chain_function (filter->sinkpad, gst_bpwsinc_chain);
gst_pad_set_link_function (filter->sinkpad, gst_bpwsinc_sink_connect);
gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
filter->srcpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&gst_filter_src_template), "src");
gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
filter->wing_size = 50;
filter->lower_frequency = 0.25;
filter->upper_frequency = 0.3;
filter->kernel = NULL;
this->wing_size = 50;
this->lower_frequency = 0.25;
this->upper_frequency = 0.3;
this->kernel = NULL;
}
static GstPadLinkReturn
gst_bpwsinc_sink_connect (GstPad * pad, const GstCaps * caps)
/* GstBaseTransform vmethod implementations */
/* get notified of caps and plug in the correct process function */
static gboolean
bpwsinc_set_caps (GstBaseTransform * base, GstCaps * incaps, GstCaps * outcaps)
{
int i = 0;
double sum = 0.0;
int len = 0;
double *kernel_lp, *kernel_hp;
GstPadLinkReturn set_retval;
GstBPWSinc *filter = GST_BPWSINC (gst_pad_get_parent (pad));
g_assert (GST_IS_PAD (pad));
g_assert (caps != NULL);
set_retval = gst_pad_try_set_caps (filter->srcpad, caps);
if (set_retval > 0) {
len = filter->wing_size;
/* fill the lp kernel */
GST_DEBUG ("bpwsinc: initializing LP kernel of length %d with cut-off %f",
len * 2 + 1, filter->lower_frequency);
kernel_lp = (double *) g_malloc (sizeof (double) * (2 * len + 1));
for (i = 0; i <= len * 2; ++i) {
if (i == len)
kernel_lp[i] = 2 * M_PI * filter->lower_frequency;
else
kernel_lp[i] = sin (2 * M_PI * filter->lower_frequency * (i - len))
/ (i - len);
/* Blackman windowing */
kernel_lp[i] *= (0.42 - 0.5 * cos (M_PI * i / len)
+ 0.08 * cos (2 * M_PI * i / len));
}
/* normalize for unity gain at DC
* FIXME: sure this is not supposed to be quadratic ? */
sum = 0.0;
for (i = 0; i <= len * 2; ++i)
sum += kernel_lp[i];
for (i = 0; i <= len * 2; ++i)
kernel_lp[i] /= sum;
/* fill the hp kernel */
GST_DEBUG ("bpwsinc: initializing HP kernel of length %d with cut-off %f",
len * 2 + 1, filter->upper_frequency);
kernel_hp = (double *) g_malloc (sizeof (double) * (2 * len + 1));
for (i = 0; i <= len * 2; ++i) {
if (i == len)
kernel_hp[i] = 2 * M_PI * filter->upper_frequency;
else
kernel_hp[i] = sin (2 * M_PI * filter->upper_frequency * (i - len))
/ (i - len);
/* Blackman windowing */
kernel_hp[i] *= (0.42 - 0.5 * cos (M_PI * i / len)
+ 0.08 * cos (2 * M_PI * i / len));
}
/* normalize for unity gain at DC
* FIXME: sure this is not supposed to be quadratic ? */
sum = 0.0;
for (i = 0; i <= len * 2; ++i)
sum += kernel_hp[i];
for (i = 0; i <= len * 2; ++i)
kernel_hp[i] /= sum;
/* do spectral inversion to get a HP filter */
for (i = 0; i <= len * 2; ++i)
kernel_hp[i] = -kernel_hp[i];
kernel_hp[len] += 1;
/* combine the two filters */
filter->kernel = (double *) g_malloc (sizeof (double) * (2 * len + 1));
for (i = 0; i <= len * 2; ++i)
filter->kernel[i] = kernel_lp[i] + kernel_hp[i];
/* do spectral inversion to go from band reject to bandpass */
for (i = 0; i <= len * 2; ++i)
filter->kernel[i] = -filter->kernel[i];
filter->kernel[len] += 1;
/* free the helper kernels */
g_free (kernel_lp);
g_free (kernel_hp);
/* set up the residue memory space */
filter->residue = (gfloat *) g_malloc (sizeof (gfloat) * (len * 2 + 1));
for (i = 0; i <= len * 2; ++i)
filter->residue[i] = 0.0;
GstBPWSinc *this = GST_BPWSINC (base);
GST_DEBUG_OBJECT (this,
"set_caps: in %" GST_PTR_FORMAT " out %" GST_PTR_FORMAT, incaps, outcaps);
len = this->wing_size;
/* fill the lp kernel */
GST_DEBUG ("bpwsinc: initializing LP kernel of length %d with cut-off %f",
len * 2 + 1, this->lower_frequency);
kernel_lp = (double *) g_malloc (sizeof (double) * (2 * len + 1));
for (i = 0; i <= len * 2; ++i) {
if (i == len)
kernel_lp[i] = 2 * M_PI * this->lower_frequency;
else
kernel_lp[i] = sin (2 * M_PI * this->lower_frequency * (i - len))
/ (i - len);
/* Blackman windowing */
kernel_lp[i] *= (0.42 - 0.5 * cos (M_PI * i / len)
+ 0.08 * cos (2 * M_PI * i / len));
}
/* normalize for unity gain at DC
* FIXME: sure this is not supposed to be quadratic ? */
sum = 0.0;
for (i = 0; i <= len * 2; ++i)
sum += kernel_lp[i];
for (i = 0; i <= len * 2; ++i)
kernel_lp[i] /= sum;
/* fill the hp kernel */
GST_DEBUG ("bpwsinc: initializing HP kernel of length %d with cut-off %f",
len * 2 + 1, this->upper_frequency);
kernel_hp = (double *) g_malloc (sizeof (double) * (2 * len + 1));
for (i = 0; i <= len * 2; ++i) {
if (i == len)
kernel_hp[i] = 2 * M_PI * this->upper_frequency;
else
kernel_hp[i] = sin (2 * M_PI * this->upper_frequency * (i - len))
/ (i - len);
/* Blackman windowing */
kernel_hp[i] *= (0.42 - 0.5 * cos (M_PI * i / len)
+ 0.08 * cos (2 * M_PI * i / len));
}
return set_retval;
/* normalize for unity gain at DC
* FIXME: sure this is not supposed to be quadratic ? */
sum = 0.0;
for (i = 0; i <= len * 2; ++i)
sum += kernel_hp[i];
for (i = 0; i <= len * 2; ++i)
kernel_hp[i] /= sum;
/* combine the two thiss */
this->kernel = (double *) g_malloc (sizeof (double) * (2 * len + 1));
for (i = 0; i <= len * 2; ++i)
this->kernel[i] = kernel_lp[i] + kernel_hp[i];
/* do spectral inversion to go from band reject to bandpass */
for (i = 0; i <= len * 2; ++i)
this->kernel[i] = -this->kernel[i];
this->kernel[len] += 1;
/* free the helper kernels */
g_free (kernel_lp);
g_free (kernel_hp);
/* set up the residue memory space */
this->residue = (gfloat *) g_malloc (sizeof (gfloat) * (len * 2 + 1));
for (i = 0; i <= len * 2; ++i)
this->residue[i] = 0.0;
return TRUE;
}
static void
gst_bpwsinc_chain (GstPad * pad, GstData * _data)
static GstFlowReturn
bpwsinc_transform_ip (GstBaseTransform * base, GstBuffer * outbuf)
{
GstBuffer *buf = GST_BUFFER (_data);
GstBPWSinc *filter;
GstBPWSinc *this = GST_BPWSINC (base);
GstClockTime timestamp;
/* don't process data in passthrough-mode */
if (gst_base_transform_is_passthrough (base))
return GST_FLOW_OK;
/* FIXME: subdivide GST_BUFFER_SIZE into small chunks for smooth fades */
timestamp = GST_BUFFER_TIMESTAMP (outbuf);
if (GST_CLOCK_TIME_IS_VALID (timestamp))
gst_object_sync_values (G_OBJECT (this), timestamp);
gfloat *src;
gfloat *input;
gint residue_samples;
int residue_samples;
gint input_samples;
gint total_samples;
int i, j;
filter = GST_BPWSINC (gst_pad_get_parent (pad));
/* FIXME: out of laziness, we copy the left-over bit from last buffer
* together with the incoming buffer to a new buffer to make the loop
* easy; this could be a lot more optimized though
* to make amends we keep the incoming buffer around and write our
* output samples there */
/* get a writable buffer */
buf = gst_buffer_copy_on_write (buf);
src = (gfloat *) GST_BUFFER_DATA (buf);
residue_samples = filter->wing_size * 2 + 1;
input_samples = GST_BUFFER_SIZE (buf) / sizeof (gfloat);
src = (gfloat *) GST_BUFFER_DATA (outbuf);
residue_samples = this->wing_size * 2 + 1;
input_samples = GST_BUFFER_SIZE (outbuf) / sizeof (gfloat);
total_samples = residue_samples + input_samples;
input = (gfloat *) g_malloc (sizeof (gfloat) * total_samples);
/* copy the left-over bit */
memcpy (input, filter->residue, sizeof (gfloat) * residue_samples);
memcpy (input, this->residue, sizeof (gfloat) * residue_samples);
/* copy the new buffer */
memcpy (&input[residue_samples], src, sizeof (gfloat) * input_samples);
/* copy the tail of the current input buffer to the residue */
memcpy (filter->residue, &src[input_samples - residue_samples],
memcpy (this->residue, &src[input_samples - residue_samples],
sizeof (gfloat) * residue_samples);
/* convolution */
......@@ -333,57 +301,53 @@ gst_bpwsinc_chain (GstPad * pad, GstData * _data)
for (i = 0; i < input_samples; ++i) {
src[i] = 0.0;
for (j = 0; j < residue_samples; ++j)
src[i] += input[i - j + residue_samples] * filter->kernel[j];
src[i] += input[i - j + residue_samples] * this->kernel[j];
}
g_free (input);
gst_pad_push (filter->srcpad, GST_DATA (buf));
return GST_FLOW_OK;
}
static void
gst_bpwsinc_set_property (GObject * object, guint prop_id, const GValue * value,
bpwsinc_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstBPWSinc *filter;
g_return_if_fail (GST_IS_BPWSINC (object));
GstBPWSinc *this = GST_BPWSINC (object);
filter = GST_BPWSINC (object);
g_return_if_fail (GST_IS_BPWSINC (this));
switch (prop_id) {
case ARG_LENGTH:
filter->wing_size = g_value_get_int (value);
case PROP_LENGTH:
this->wing_size = g_value_get_int (value);
break;
case ARG_LOWER_FREQUENCY:
filter->lower_frequency = g_value_get_double (value);
case PROP_LOWER_FREQUENCY:
this->lower_frequency = g_value_get_double (value);
break;
case ARG_UPPER_FREQUENCY:
filter->upper_frequency = g_value_get_double (value);
case PROP_UPPER_FREQUENCY:
this->upper_frequency = g_value_get_double (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_bpwsinc_get_property (GObject * object, guint prop_id, GValue * value,
bpwsinc_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstBPWSinc *filter;
g_return_if_fail (GST_IS_BPWSINC (object));
filter = GST_BPWSINC (object);
GstBPWSinc *this = GST_BPWSINC (object);
switch (prop_id) {
case ARG_LENGTH:
g_value_set_int (value, filter->wing_size);
case PROP_LENGTH:
g_value_set_int (value, this->wing_size);
break;
case ARG_LOWER_FREQUENCY:
g_value_set_double (value, filter->lower_frequency);
case PROP_LOWER_FREQUENCY:
g_value_set_double (value, this->lower_frequency);
break;
case ARG_UPPER_FREQUENCY:
g_value_set_double (value, filter->upper_frequency);
case PROP_UPPER_FREQUENCY:
g_value_set_double (value, this->upper_frequency);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
......
/* -*- c-basic-offset: 2 -*-
*
* GStreamer
* Copyright (C) 1999-2001 Erik Walthinsen <omega@cse.ogi.edu>
* 2006 Dreamlab Technologies Ltd. <mathis.hofer@dreamlab.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
......@@ -16,15 +18,14 @@
* 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 windowed sinc filter is taken from the freely downloadable DSP book,
*
*
* this windowed sinc filter is taken from the freely downloadable DSP book,
* "The Scientist and Engineer's Guide to Digital Signal Processing",
* chapter 16
* available at http://www.dspguide.com/
*/
/* FIXME:
*
* FIXME:
* - this filter is totally unoptimized !
* - we do not destroy the allocated memory for filters and residue
* - this might be improved upon with bytestream
......@@ -33,17 +34,27 @@
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <math.h>
#include <gst/gst.h>
#include "gstfilter.h"
#include <math.h> /* M_PI */
#include <string.h> /* memmove */
#include <gst/base/gstbasetransform.h>
#include <gst/controller/gstcontroller.h>
#include "gstlpwsinc.h"
#define GST_CAT_DEFAULT gst_lpwsinc_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
static const GstElementDetails gst_lpwsinc_details =
static const GstElementDetails lpwsinc_details =
GST_ELEMENT_DETAILS ("Low-pass Windowed sinc filter",
"Filter/Effect/Audio",
"Low-pass Windowed sinc filter",
"Thomas <thomas@apestaart.org>, " "Steven W. Smith");
"Thomas <thomas@apestaart.org>, "
"Steven W. Smith, "
"Dreamlab Technologies Ltd. <mathis.hofer@dreamlab.net>");