gstreamer/gst/equalizer/gstiirequalizernbands.c
Stefan Kost 08821314b4 gst/equalizer/: Better algorith for the center frequencies. Subtract band filters from input for negative gains. Rewo...
Original commit message from CVS:
* gst/equalizer/gstiirequalizer.c:
(gst_iir_equalizer_band_set_property),
(gst_iir_equalizer_child_proxy_get_child_by_index),
(gst_iir_equalizer_child_proxy_get_children_count),
(gst_iir_equalizer_child_proxy_interface_init),
(gst_iir_equalizer_class_init), (arg_to_scale), (setup_filter),
(gst_iir_equalizer_compute_frequencies):
* gst/equalizer/gstiirequalizer10bands.c:
(gst_iir_equalizer_10bands_class_init):
* gst/equalizer/gstiirequalizer3bands.c:
(gst_iir_equalizer_3bands_class_init):
* gst/equalizer/gstiirequalizernbands.c:
Better algorith for the center frequencies. Subtract band filters from
input for negative gains. Rework the gain mapping.
2007-07-20 11:37:37 +00:00

134 lines
4 KiB
C

/* GStreamer
* Copyright (C) <2004> Benjamin Otte <otte@gnome.org>
* <2007> Stefan Kost <ensonic@users.sf.net>
*
* 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.
*/
/**
* SECTION:element-equalizer-nbands
*
* <refsect2>
* <title>Example launch line</title>
* <para>
* The n-band equalizer element changes the frequency spectrum of the audio data.
* </para>
* <para>
* <programlisting>
* gst-launch filesrc location=song.ogg ! oggdemux ! vorbisdec ! audioconvert ! equalizer-nbands num-bands=15 band5::gain=1.0 ! alsasink
* </programlisting>
* This make the equalizer use 15 bands and raises the volume of the 5th band by 6 db.
* </para>
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstiirequalizer.h"
#include "gstiirequalizernbands.h"
enum
{
ARG_NUM_BANDS = 1
};
static void gst_iir_equalizer_nbands_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_iir_equalizer_nbands_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
GST_DEBUG_CATEGORY_EXTERN (equalizer_debug);
#define GST_CAT_DEFAULT equalizer_debug
GST_BOILERPLATE (GstIirEqualizerNBands, gst_iir_equalizer_nbands,
GstIirEqualizer, GST_TYPE_IIR_EQUALIZER);
/* equalizer implementation */
static void
gst_iir_equalizer_nbands_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
const GstElementDetails iir_equalizer_details =
GST_ELEMENT_DETAILS ("N Band Equalizer",
"Filter/Effect/Audio",
"Direct Form IIR equalizer",
"Benjamin Otte <otte@gnome.org>," " Stefan Kost <ensonic@users.sf.net>");
gst_element_class_set_details (element_class, &iir_equalizer_details);
}
static void
gst_iir_equalizer_nbands_class_init (GstIirEqualizerNBandsClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
gobject_class->set_property = gst_iir_equalizer_nbands_set_property;
gobject_class->get_property = gst_iir_equalizer_nbands_get_property;
g_object_class_install_property (gobject_class, ARG_NUM_BANDS,
g_param_spec_uint ("num-bands", "num-bands",
"number of different bands to use", 2, 64, 10,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
}
static void
gst_iir_equalizer_nbands_init (GstIirEqualizerNBands * equ_n,
GstIirEqualizerNBandsClass * g_class)
{
GstIirEqualizer *equ = GST_IIR_EQUALIZER (equ_n);
gst_iir_equalizer_compute_frequencies (equ, 10);
}
static void
gst_iir_equalizer_nbands_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstIirEqualizer *equ = GST_IIR_EQUALIZER (object);
GST_BASE_TRANSFORM_LOCK (equ);
GST_OBJECT_LOCK (equ);
switch (prop_id) {
case ARG_NUM_BANDS:
gst_iir_equalizer_compute_frequencies (equ, g_value_get_uint (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (equ);
GST_BASE_TRANSFORM_UNLOCK (equ);
}
static void
gst_iir_equalizer_nbands_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstIirEqualizer *equ = GST_IIR_EQUALIZER (object);
switch (prop_id) {
case ARG_NUM_BANDS:
g_value_set_uint (value, equ->freq_band_count);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}