mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-06 09:29:42 +00:00
576 lines
17 KiB
C
576 lines
17 KiB
C
/*
|
|
* GStreamer
|
|
* Copyright (C) 2007-2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
|
|
*
|
|
* 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., 51 Franklin St, Fifth Floor,
|
|
* Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
/*
|
|
* Chebyshev type 1 filter design based on
|
|
* "The Scientist and Engineer's Guide to DSP", Chapter 20.
|
|
* http://www.dspguide.com/
|
|
*
|
|
* For type 2 and Chebyshev filters in general read
|
|
* http://en.wikipedia.org/wiki/Chebyshev_filter
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* SECTION:element-audiocheblimit
|
|
* @title: audiocheblimit
|
|
*
|
|
* Attenuates all frequencies above the cutoff frequency (low-pass) or all frequencies below the
|
|
* cutoff frequency (high-pass). The number of poles and the ripple parameter control the rolloff.
|
|
*
|
|
* This element has the advantage over the windowed sinc lowpass and highpass filter that it is
|
|
* much faster and produces almost as good results. It's only disadvantages are the highly
|
|
* non-linear phase and the slower rolloff compared to a windowed sinc filter with a large kernel.
|
|
*
|
|
* For type 1 the ripple parameter specifies how much ripple in dB is allowed in the passband, i.e.
|
|
* some frequencies in the passband will be amplified by that value. A higher ripple value will allow
|
|
* a faster rolloff.
|
|
*
|
|
* For type 2 the ripple parameter specifies the stopband attenuation. In the stopband the gain will
|
|
* be at most this value. A lower ripple value will allow a faster rolloff.
|
|
*
|
|
* As a special case, a Chebyshev type 1 filter with no ripple is a Butterworth filter.
|
|
*
|
|
* > Be warned that a too large number of poles can produce noise. The most poles are possible with
|
|
* > a cutoff frequency at a quarter of the sampling rate.
|
|
*
|
|
* ## Example launch line
|
|
* |[
|
|
* gst-launch-1.0 audiotestsrc freq=1500 ! audioconvert ! audiocheblimit mode=low-pass cutoff=1000 poles=4 ! audioconvert ! alsasink
|
|
* gst-launch-1.0 filesrc location="melo1.ogg" ! oggdemux ! vorbisdec ! audioconvert ! audiocheblimit mode=high-pass cutoff=400 ripple=0.2 ! audioconvert ! alsasink
|
|
* gst-launch-1.0 audiotestsrc wave=white-noise ! audioconvert ! audiocheblimit mode=low-pass cutoff=800 type=2 ! audioconvert ! alsasink
|
|
* ]|
|
|
*
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <string.h>
|
|
|
|
#include <gst/gst.h>
|
|
#include <gst/base/gstbasetransform.h>
|
|
#include <gst/audio/audio.h>
|
|
#include <gst/audio/gstaudiofilter.h>
|
|
|
|
#include <math.h>
|
|
|
|
#include "math_compat.h"
|
|
|
|
#include "audiocheblimit.h"
|
|
|
|
#include "gst/glib-compat-private.h"
|
|
|
|
#define GST_CAT_DEFAULT gst_audio_cheb_limit_debug
|
|
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
|
|
|
|
enum
|
|
{
|
|
PROP_0,
|
|
PROP_MODE,
|
|
PROP_TYPE,
|
|
PROP_CUTOFF,
|
|
PROP_RIPPLE,
|
|
PROP_POLES
|
|
};
|
|
|
|
#define gst_audio_cheb_limit_parent_class parent_class
|
|
G_DEFINE_TYPE (GstAudioChebLimit,
|
|
gst_audio_cheb_limit, GST_TYPE_AUDIO_FX_BASE_IIR_FILTER);
|
|
GST_ELEMENT_REGISTER_DEFINE (audiocheblimit, "audiocheblimit",
|
|
GST_RANK_NONE, GST_TYPE_AUDIO_CHEB_LIMIT);
|
|
|
|
static void gst_audio_cheb_limit_set_property (GObject * object,
|
|
guint prop_id, const GValue * value, GParamSpec * pspec);
|
|
static void gst_audio_cheb_limit_get_property (GObject * object,
|
|
guint prop_id, GValue * value, GParamSpec * pspec);
|
|
static void gst_audio_cheb_limit_finalize (GObject * object);
|
|
|
|
static gboolean gst_audio_cheb_limit_setup (GstAudioFilter * filter,
|
|
const GstAudioInfo * info);
|
|
|
|
enum
|
|
{
|
|
MODE_LOW_PASS = 0,
|
|
MODE_HIGH_PASS
|
|
};
|
|
|
|
#define GST_TYPE_AUDIO_CHEBYSHEV_FREQ_LIMIT_MODE (gst_audio_cheb_limit_mode_get_type ())
|
|
static GType
|
|
gst_audio_cheb_limit_mode_get_type (void)
|
|
{
|
|
static GType gtype = 0;
|
|
|
|
if (gtype == 0) {
|
|
static const GEnumValue values[] = {
|
|
{MODE_LOW_PASS, "Low pass (default)",
|
|
"low-pass"},
|
|
{MODE_HIGH_PASS, "High pass",
|
|
"high-pass"},
|
|
{0, NULL, NULL}
|
|
};
|
|
|
|
gtype = g_enum_register_static ("GstAudioChebLimitMode", values);
|
|
}
|
|
return gtype;
|
|
}
|
|
|
|
/* GObject vmethod implementations */
|
|
|
|
static void
|
|
gst_audio_cheb_limit_class_init (GstAudioChebLimitClass * klass)
|
|
{
|
|
GObjectClass *gobject_class = (GObjectClass *) klass;
|
|
GstElementClass *gstelement_class = (GstElementClass *) klass;
|
|
GstAudioFilterClass *filter_class = (GstAudioFilterClass *) klass;
|
|
|
|
GST_DEBUG_CATEGORY_INIT (gst_audio_cheb_limit_debug, "audiocheblimit", 0,
|
|
"audiocheblimit element");
|
|
|
|
gobject_class->set_property = gst_audio_cheb_limit_set_property;
|
|
gobject_class->get_property = gst_audio_cheb_limit_get_property;
|
|
gobject_class->finalize = gst_audio_cheb_limit_finalize;
|
|
|
|
g_object_class_install_property (gobject_class, PROP_MODE,
|
|
g_param_spec_enum ("mode", "Mode",
|
|
"Low pass or high pass mode",
|
|
GST_TYPE_AUDIO_CHEBYSHEV_FREQ_LIMIT_MODE, MODE_LOW_PASS,
|
|
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
|
|
g_object_class_install_property (gobject_class, PROP_TYPE,
|
|
g_param_spec_int ("type", "Type", "Type of the chebychev filter", 1, 2, 1,
|
|
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
|
|
|
|
/* FIXME: Don't use the complete possible range but restrict the upper boundary
|
|
* so automatically generated UIs can use a slider without */
|
|
g_object_class_install_property (gobject_class, PROP_CUTOFF,
|
|
g_param_spec_float ("cutoff", "Cutoff", "Cut off frequency (Hz)", 0.0,
|
|
100000.0, 0.0,
|
|
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
|
|
g_object_class_install_property (gobject_class, PROP_RIPPLE,
|
|
g_param_spec_float ("ripple", "Ripple", "Amount of ripple (dB)", 0.0,
|
|
200.0, 0.25,
|
|
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
|
|
|
|
/* FIXME: What to do about this upper boundary? With a cutoff frequency of
|
|
* rate/4 32 poles are completely possible, with a cutoff frequency very low
|
|
* or very high 16 poles already produces only noise */
|
|
g_object_class_install_property (gobject_class, PROP_POLES,
|
|
g_param_spec_int ("poles", "Poles",
|
|
"Number of poles to use, will be rounded up to the next even number",
|
|
2, 32, 4,
|
|
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
|
|
|
|
gst_element_class_set_static_metadata (gstelement_class,
|
|
"Low pass & high pass filter",
|
|
"Filter/Effect/Audio",
|
|
"Chebyshev low pass and high pass filter",
|
|
"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
|
|
|
|
filter_class->setup = GST_DEBUG_FUNCPTR (gst_audio_cheb_limit_setup);
|
|
|
|
gst_type_mark_as_plugin_api (GST_TYPE_AUDIO_CHEBYSHEV_FREQ_LIMIT_MODE, 0);
|
|
}
|
|
|
|
static void
|
|
gst_audio_cheb_limit_init (GstAudioChebLimit * filter)
|
|
{
|
|
filter->cutoff = 0.0;
|
|
filter->mode = MODE_LOW_PASS;
|
|
filter->type = 1;
|
|
filter->poles = 4;
|
|
filter->ripple = 0.25;
|
|
|
|
g_mutex_init (&filter->lock);
|
|
}
|
|
|
|
static void
|
|
generate_biquad_coefficients (GstAudioChebLimit * filter,
|
|
gint p, gint rate, gdouble * b0, gdouble * b1, gdouble * b2,
|
|
gdouble * a1, gdouble * a2)
|
|
{
|
|
gint np = filter->poles;
|
|
gdouble ripple = filter->ripple;
|
|
|
|
/* pole location in s-plane */
|
|
gdouble rp, ip;
|
|
|
|
/* zero location in s-plane */
|
|
gdouble iz = 0.0;
|
|
|
|
/* transfer function coefficients for the z-plane */
|
|
gdouble x0, x1, x2, y1, y2;
|
|
gint type = filter->type;
|
|
|
|
/* Calculate pole location for lowpass at frequency 1 */
|
|
{
|
|
gdouble angle = (G_PI / 2.0) * (2.0 * p - 1) / np;
|
|
|
|
rp = -sin (angle);
|
|
ip = cos (angle);
|
|
}
|
|
|
|
/* If we allow ripple, move the pole from the unit
|
|
* circle to an ellipse and keep cutoff at frequency 1 */
|
|
if (ripple > 0 && type == 1) {
|
|
gdouble es, vx;
|
|
|
|
es = sqrt (pow (10.0, ripple / 10.0) - 1.0);
|
|
|
|
vx = (1.0 / np) * asinh (1.0 / es);
|
|
rp = rp * sinh (vx);
|
|
ip = ip * cosh (vx);
|
|
} else if (type == 2) {
|
|
gdouble es, vx;
|
|
|
|
es = sqrt (pow (10.0, ripple / 10.0) - 1.0);
|
|
vx = (1.0 / np) * asinh (es);
|
|
rp = rp * sinh (vx);
|
|
ip = ip * cosh (vx);
|
|
}
|
|
|
|
/* Calculate inverse of the pole location to convert from
|
|
* type I to type II */
|
|
if (type == 2) {
|
|
gdouble mag2 = rp * rp + ip * ip;
|
|
|
|
rp /= mag2;
|
|
ip /= mag2;
|
|
}
|
|
|
|
/* Calculate zero location for frequency 1 on the
|
|
* unit circle for type 2 */
|
|
if (type == 2) {
|
|
gdouble angle = G_PI / (np * 2.0) + ((p - 1) * G_PI) / (np);
|
|
gdouble mag2;
|
|
|
|
iz = cos (angle);
|
|
mag2 = iz * iz;
|
|
iz /= mag2;
|
|
}
|
|
|
|
/* Convert from s-domain to z-domain by
|
|
* using the bilinear Z-transform, i.e.
|
|
* substitute s by (2/t)*((z-1)/(z+1))
|
|
* with t = 2 * tan(0.5).
|
|
*/
|
|
if (type == 1) {
|
|
gdouble t, m, d;
|
|
|
|
t = 2.0 * tan (0.5);
|
|
m = rp * rp + ip * ip;
|
|
d = 4.0 - 4.0 * rp * t + m * t * t;
|
|
|
|
x0 = (t * t) / d;
|
|
x1 = 2.0 * x0;
|
|
x2 = x0;
|
|
y1 = (8.0 - 2.0 * m * t * t) / d;
|
|
y2 = (-4.0 - 4.0 * rp * t - m * t * t) / d;
|
|
} else {
|
|
gdouble t, m, d;
|
|
|
|
t = 2.0 * tan (0.5);
|
|
m = rp * rp + ip * ip;
|
|
d = 4.0 - 4.0 * rp * t + m * t * t;
|
|
|
|
x0 = (t * t * iz * iz + 4.0) / d;
|
|
x1 = (-8.0 + 2.0 * iz * iz * t * t) / d;
|
|
x2 = x0;
|
|
y1 = (8.0 - 2.0 * m * t * t) / d;
|
|
y2 = (-4.0 - 4.0 * rp * t - m * t * t) / d;
|
|
}
|
|
|
|
/* Convert from lowpass at frequency 1 to either lowpass
|
|
* or highpass.
|
|
*
|
|
* For lowpass substitute z^(-1) with:
|
|
* -1
|
|
* z - k
|
|
* ------------
|
|
* -1
|
|
* 1 - k * z
|
|
*
|
|
* k = sin((1-w)/2) / sin((1+w)/2)
|
|
*
|
|
* For highpass substitute z^(-1) with:
|
|
*
|
|
* -1
|
|
* -z - k
|
|
* ------------
|
|
* -1
|
|
* 1 + k * z
|
|
*
|
|
* k = -cos((1+w)/2) / cos((1-w)/2)
|
|
*
|
|
*/
|
|
{
|
|
gdouble k, d;
|
|
gdouble omega = 2.0 * G_PI * (filter->cutoff / rate);
|
|
|
|
if (filter->mode == MODE_LOW_PASS)
|
|
k = sin ((1.0 - omega) / 2.0) / sin ((1.0 + omega) / 2.0);
|
|
else
|
|
k = -cos ((omega + 1.0) / 2.0) / cos ((omega - 1.0) / 2.0);
|
|
|
|
d = 1.0 + y1 * k - y2 * k * k;
|
|
*b0 = (x0 + k * (-x1 + k * x2)) / d;
|
|
*b1 = (x1 + k * k * x1 - 2.0 * k * (x0 + x2)) / d;
|
|
*b2 = (x0 * k * k - x1 * k + x2) / d;
|
|
*a1 = (2.0 * k + y1 + y1 * k * k - 2.0 * y2 * k) / d;
|
|
*a2 = (-k * k - y1 * k + y2) / d;
|
|
|
|
if (filter->mode == MODE_HIGH_PASS) {
|
|
*a1 = -*a1;
|
|
*b1 = -*b1;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
generate_coefficients (GstAudioChebLimit * filter, const GstAudioInfo * info)
|
|
{
|
|
gint rate;
|
|
|
|
if (info) {
|
|
rate = GST_AUDIO_INFO_RATE (info);
|
|
} else {
|
|
rate = GST_AUDIO_FILTER_RATE (filter);
|
|
}
|
|
|
|
GST_LOG_OBJECT (filter, "cutoff %f", filter->cutoff);
|
|
|
|
if (rate == 0) {
|
|
gdouble *a = g_new0 (gdouble, 1);
|
|
gdouble *b = g_new0 (gdouble, 1);
|
|
|
|
a[0] = 1.0;
|
|
b[0] = 1.0;
|
|
gst_audio_fx_base_iir_filter_set_coefficients (GST_AUDIO_FX_BASE_IIR_FILTER
|
|
(filter), a, 1, b, 1);
|
|
|
|
GST_LOG_OBJECT (filter, "rate was not set yet");
|
|
return;
|
|
}
|
|
|
|
if (filter->cutoff >= rate / 2.0) {
|
|
gdouble *a = g_new0 (gdouble, 1);
|
|
gdouble *b = g_new0 (gdouble, 1);
|
|
|
|
a[0] = 1.0;
|
|
b[0] = (filter->mode == MODE_LOW_PASS) ? 1.0 : 0.0;
|
|
gst_audio_fx_base_iir_filter_set_coefficients (GST_AUDIO_FX_BASE_IIR_FILTER
|
|
(filter), a, 1, b, 1);
|
|
GST_LOG_OBJECT (filter, "cutoff was higher than nyquist frequency");
|
|
return;
|
|
} else if (filter->cutoff <= 0.0) {
|
|
gdouble *a = g_new0 (gdouble, 1);
|
|
gdouble *b = g_new0 (gdouble, 1);
|
|
|
|
a[0] = 1.0;
|
|
b[0] = (filter->mode == MODE_LOW_PASS) ? 0.0 : 1.0;
|
|
gst_audio_fx_base_iir_filter_set_coefficients (GST_AUDIO_FX_BASE_IIR_FILTER
|
|
(filter), a, 1, b, 1);
|
|
GST_LOG_OBJECT (filter, "cutoff is lower than zero");
|
|
return;
|
|
}
|
|
|
|
/* Calculate coefficients for the chebyshev filter */
|
|
{
|
|
gint np = filter->poles;
|
|
gdouble *a, *b;
|
|
gint i, p;
|
|
|
|
a = g_new0 (gdouble, np + 3);
|
|
b = g_new0 (gdouble, np + 3);
|
|
|
|
/* Calculate transfer function coefficients */
|
|
a[2] = 1.0;
|
|
b[2] = 1.0;
|
|
|
|
for (p = 1; p <= np / 2; p++) {
|
|
gdouble b0, b1, b2, a1, a2;
|
|
gdouble *ta = g_new0 (gdouble, np + 3);
|
|
gdouble *tb = g_new0 (gdouble, np + 3);
|
|
|
|
generate_biquad_coefficients (filter, p, rate, &b0, &b1, &b2, &a1, &a2);
|
|
|
|
memcpy (ta, a, sizeof (gdouble) * (np + 3));
|
|
memcpy (tb, b, sizeof (gdouble) * (np + 3));
|
|
|
|
/* add the new coefficients for the new two poles
|
|
* to the cascade by multiplication of the transfer
|
|
* functions */
|
|
for (i = 2; i < np + 3; i++) {
|
|
b[i] = b0 * tb[i] + b1 * tb[i - 1] + b2 * tb[i - 2];
|
|
a[i] = ta[i] - a1 * ta[i - 1] - a2 * ta[i - 2];
|
|
}
|
|
g_free (ta);
|
|
g_free (tb);
|
|
}
|
|
|
|
/* Move coefficients to the beginning of the array to move from
|
|
* the transfer function's coefficients to the difference
|
|
* equation's coefficients */
|
|
for (i = 0; i <= np; i++) {
|
|
a[i] = a[i + 2];
|
|
b[i] = b[i + 2];
|
|
}
|
|
|
|
/* Normalize to unity gain at frequency 0 for lowpass
|
|
* and frequency 0.5 for highpass */
|
|
{
|
|
gdouble gain;
|
|
|
|
if (filter->mode == MODE_LOW_PASS)
|
|
gain =
|
|
gst_audio_fx_base_iir_filter_calculate_gain (a, np + 1, b, np + 1,
|
|
1.0, 0.0);
|
|
else
|
|
gain =
|
|
gst_audio_fx_base_iir_filter_calculate_gain (a, np + 1, b, np + 1,
|
|
-1.0, 0.0);
|
|
|
|
for (i = 0; i <= np; i++) {
|
|
b[i] /= gain;
|
|
}
|
|
}
|
|
|
|
gst_audio_fx_base_iir_filter_set_coefficients (GST_AUDIO_FX_BASE_IIR_FILTER
|
|
(filter), a, np + 1, b, np + 1);
|
|
|
|
GST_LOG_OBJECT (filter,
|
|
"Generated IIR coefficients for the Chebyshev filter");
|
|
GST_LOG_OBJECT (filter,
|
|
"mode: %s, type: %d, poles: %d, cutoff: %.2f Hz, ripple: %.2f dB",
|
|
(filter->mode == MODE_LOW_PASS) ? "low-pass" : "high-pass",
|
|
filter->type, filter->poles, filter->cutoff, filter->ripple);
|
|
GST_LOG_OBJECT (filter, "%.2f dB gain @ 0 Hz",
|
|
20.0 * log10 (gst_audio_fx_base_iir_filter_calculate_gain (a, np + 1, b,
|
|
np + 1, 1.0, 0.0)));
|
|
|
|
#ifndef GST_DISABLE_GST_DEBUG
|
|
{
|
|
gdouble wc = 2.0 * G_PI * (filter->cutoff / rate);
|
|
gdouble zr = cos (wc), zi = sin (wc);
|
|
|
|
GST_LOG_OBJECT (filter, "%.2f dB gain @ %d Hz",
|
|
20.0 * log10 (gst_audio_fx_base_iir_filter_calculate_gain (a, np + 1,
|
|
b, np + 1, zr, zi)), (int) filter->cutoff);
|
|
}
|
|
#endif
|
|
|
|
GST_LOG_OBJECT (filter, "%.2f dB gain @ %d Hz",
|
|
20.0 * log10 (gst_audio_fx_base_iir_filter_calculate_gain (a, np + 1, b,
|
|
np + 1, -1.0, 0.0)), rate);
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_audio_cheb_limit_finalize (GObject * object)
|
|
{
|
|
GstAudioChebLimit *filter = GST_AUDIO_CHEB_LIMIT (object);
|
|
|
|
g_mutex_clear (&filter->lock);
|
|
|
|
G_OBJECT_CLASS (parent_class)->finalize (object);
|
|
}
|
|
|
|
static void
|
|
gst_audio_cheb_limit_set_property (GObject * object, guint prop_id,
|
|
const GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstAudioChebLimit *filter = GST_AUDIO_CHEB_LIMIT (object);
|
|
|
|
switch (prop_id) {
|
|
case PROP_MODE:
|
|
g_mutex_lock (&filter->lock);
|
|
filter->mode = g_value_get_enum (value);
|
|
generate_coefficients (filter, NULL);
|
|
g_mutex_unlock (&filter->lock);
|
|
break;
|
|
case PROP_TYPE:
|
|
g_mutex_lock (&filter->lock);
|
|
filter->type = g_value_get_int (value);
|
|
generate_coefficients (filter, NULL);
|
|
g_mutex_unlock (&filter->lock);
|
|
break;
|
|
case PROP_CUTOFF:
|
|
g_mutex_lock (&filter->lock);
|
|
filter->cutoff = g_value_get_float (value);
|
|
generate_coefficients (filter, NULL);
|
|
g_mutex_unlock (&filter->lock);
|
|
break;
|
|
case PROP_RIPPLE:
|
|
g_mutex_lock (&filter->lock);
|
|
filter->ripple = g_value_get_float (value);
|
|
generate_coefficients (filter, NULL);
|
|
g_mutex_unlock (&filter->lock);
|
|
break;
|
|
case PROP_POLES:
|
|
g_mutex_lock (&filter->lock);
|
|
filter->poles = GST_ROUND_UP_2 (g_value_get_int (value));
|
|
generate_coefficients (filter, NULL);
|
|
g_mutex_unlock (&filter->lock);
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_audio_cheb_limit_get_property (GObject * object, guint prop_id,
|
|
GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstAudioChebLimit *filter = GST_AUDIO_CHEB_LIMIT (object);
|
|
|
|
switch (prop_id) {
|
|
case PROP_MODE:
|
|
g_value_set_enum (value, filter->mode);
|
|
break;
|
|
case PROP_TYPE:
|
|
g_value_set_int (value, filter->type);
|
|
break;
|
|
case PROP_CUTOFF:
|
|
g_value_set_float (value, filter->cutoff);
|
|
break;
|
|
case PROP_RIPPLE:
|
|
g_value_set_float (value, filter->ripple);
|
|
break;
|
|
case PROP_POLES:
|
|
g_value_set_int (value, filter->poles);
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* GstAudioFilter vmethod implementations */
|
|
|
|
static gboolean
|
|
gst_audio_cheb_limit_setup (GstAudioFilter * base, const GstAudioInfo * info)
|
|
{
|
|
GstAudioChebLimit *filter = GST_AUDIO_CHEB_LIMIT (base);
|
|
|
|
generate_coefficients (filter, info);
|
|
|
|
return GST_AUDIO_FILTER_CLASS (parent_class)->setup (base, info);
|
|
}
|