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152 lines
4.8 KiB
C
152 lines
4.8 KiB
C
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/* GStreamer
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* Copyright (C) <2007> Stefan Kost <ensonic@users.sf.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:element-equalizer-3bands
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*
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* <refsect2>
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* <title>Example launch line</title>
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* <para>
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* The 3 band equalizer element changes the frequency spectrum of the audio data.
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* </para>
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* <para>
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* <programlisting>
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* gst-launch filesrc location=song.ogg ! oggdemux ! vorbisdec ! audioconvert ! equalizer-3bands band1=-1.0 ! alsasink
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* </programlisting>
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* This lowers the volume of the 2nd band which is at 632 Hz by FIXME db.
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* </para>
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* </refsect2>
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstiirequalizer.h"
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#include "gstiirequalizer3bands.h"
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enum
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{
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ARG_BAND0 = 1,
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ARG_BAND1,
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ARG_BAND2,
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};
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static void gst_iir_equalizer_3bands_set_property (GObject * object,
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guint prop_id, const GValue * value, GParamSpec * pspec);
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static void gst_iir_equalizer_3bands_get_property (GObject * object,
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guint prop_id, GValue * value, GParamSpec * pspec);
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GST_DEBUG_CATEGORY_EXTERN ()(equalizer_debug);
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#define GST_CAT_DEFAULT equalizer_debug
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GST_BOILERPLATE (GstIirEqualizer3Bands, gst_iir_equalizer_3bands,
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GstIirEqualizer, GST_TYPE_IIR_EQUALIZER);
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/* equalizer implementation */
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static void
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gst_iir_equalizer_3bands_base_init (gpointer g_class)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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const GstElementDetails iir_equalizer_details =
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GST_ELEMENT_DETAILS ("3 Band Equalizer",
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"Filter/Effect/Audio",
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"Direct Form 3 band IIR equalizer",
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"Stefan Kost <ensonic@users.sf.net>");
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gst_element_class_set_details (element_class, &iir_equalizer_details);
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}
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static void
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gst_iir_equalizer_3bands_class_init (GstIirEqualizer3BandsClass * klass)
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{
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GObjectClass *gobject_class = (GObjectClass *) klass;
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gobject_class->set_property = gst_iir_equalizer_3bands_set_property;
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gobject_class->get_property = gst_iir_equalizer_3bands_get_property;
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g_object_class_install_property (gobject_class, ARG_BAND0,
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g_param_spec_double ("band0", "20 Hz",
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"gain for the frequency band 20 Hz, ranging from -1.0 to +1.0",
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-1.0, 1.0, 0.0, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
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g_object_class_install_property (gobject_class, ARG_BAND1,
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g_param_spec_double ("band1", "632 Hz",
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"gain for the frequency band 632 Hz, ranging from -1.0 to +1.0",
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-1.0, 1.0, 0.0, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
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g_object_class_install_property (gobject_class, ARG_BAND2,
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g_param_spec_double ("band2", "20 kHz",
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"gain for the frequency band 20 kHz, ranging from -1.0 to +1.0",
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-1.0, 1.0, 0.0, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
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}
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static void
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gst_iir_equalizer_3bands_init (GstIirEqualizer3Bands * equ_n,
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GstIirEqualizer3BandsClass * g_class)
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{
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GstIirEqualizer *equ = GST_IIR_EQUALIZER (equ_n);
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gst_iir_equalizer_compute_frequencies (equ, 3);
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}
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static void
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gst_iir_equalizer_3bands_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstIirEqualizer *equ = GST_IIR_EQUALIZER (object);
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switch (prop_id) {
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case ARG_BAND0:
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gst_child_proxy_set_property (GST_OBJECT (equ), "band0::gain", value);
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break;
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case ARG_BAND1:
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gst_child_proxy_set_property (GST_OBJECT (equ), "band1::gain", value);
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break;
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case ARG_BAND2:
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gst_child_proxy_set_property (GST_OBJECT (equ), "band2::gain", value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_iir_equalizer_3bands_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstIirEqualizer *equ = GST_IIR_EQUALIZER (object);
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switch (prop_id) {
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case ARG_BAND0:
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gst_child_proxy_get_property (GST_OBJECT (equ), "band0::gain", value);
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break;
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case ARG_BAND1:
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gst_child_proxy_get_property (GST_OBJECT (equ), "band1::gain", value);
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break;
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case ARG_BAND2:
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gst_child_proxy_get_property (GST_OBJECT (equ), "band2::gain", value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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