| /* 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., 51 Franklin St, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| /** |
| * SECTION:element-equalizer-nbands |
| * |
| * The n-band equalizer element is a fully parametric equalizer. It allows to |
| * select between 1 and 64 bands and has properties on each band to change |
| * the center frequency, band width and gain. |
| * |
| * <refsect2> |
| * <title>Example launch line</title> |
| * |[ |
| * gst-launch-1.0 filesrc location=song.ogg ! oggdemux ! vorbisdec ! audioconvert ! equalizer-nbands num-bands=15 band5::gain=6.0 ! alsasink |
| * ]| This make the equalizer use 15 bands and raises the volume of the 5th band by 6 db. |
| * </refsect2> |
| * <refsect2> |
| * <title>Example code</title> |
| * |[ |
| * #include <gst/gst.h> |
| * |
| * ... |
| * typedef struct { |
| * gfloat freq; |
| * gfloat width; |
| * gfloat gain; |
| * } GstEqualizerBandState; |
| * |
| * ... |
| * |
| * GstElement *equalizer; |
| * GObject *band; |
| * gint i; |
| * GstEqualizerBandState state[] = { |
| * { 120.0, 50.0, - 3.0}, |
| * { 500.0, 20.0, 12.0}, |
| * {1503.0, 2.0, -20.0}, |
| * {6000.0, 1000.0, 6.0}, |
| * {3000.0, 120.0, 2.0} |
| * }; |
| * |
| * ... |
| * |
| * equalizer = gst_element_factory_make ("equalizer-nbands", "equalizer"); |
| * g_object_set (G_OBJECT (equalizer), "num-bands", 5, NULL); |
| * |
| * ... |
| * |
| * for (i = 0; i < 5; i++) { |
| * band = gst_child_proxy_get_child_by_index (GST_CHILD_PROXY (equalizer), i); |
| * g_object_set (G_OBJECT (band), "freq", state[i].freq, |
| * "bandwidth", state[i].width, |
| * "gain", state[i].gain); |
| * g_object_unref (G_OBJECT (band)); |
| * } |
| * |
| * ... |
| * ]| |
| * </refsect2> |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include "gstiirequalizer.h" |
| #include "gstiirequalizernbands.h" |
| |
| |
| enum |
| { |
| PROP_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 |
| |
| #define gst_iir_equalizer_nbands_parent_class parent_class |
| G_DEFINE_TYPE (GstIirEqualizerNBands, gst_iir_equalizer_nbands, |
| GST_TYPE_IIR_EQUALIZER); |
| |
| /* equalizer implementation */ |
| |
| static void |
| gst_iir_equalizer_nbands_class_init (GstIirEqualizerNBandsClass * klass) |
| { |
| GObjectClass *gobject_class = (GObjectClass *) klass; |
| GstElementClass *gstelement_class = (GstElementClass *) 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, PROP_NUM_BANDS, |
| g_param_spec_uint ("num-bands", "num-bands", |
| "number of different bands to use", 1, 64, 10, |
| G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_CONSTRUCT)); |
| |
| gst_element_class_set_static_metadata (gstelement_class, "N Band Equalizer", |
| "Filter/Effect/Audio", |
| "Direct Form IIR equalizer", |
| "Benjamin Otte <otte@gnome.org>," " Stefan Kost <ensonic@users.sf.net>"); |
| } |
| |
| static void |
| gst_iir_equalizer_nbands_init (GstIirEqualizerNBands * equ_n) |
| { |
| 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); |
| |
| switch (prop_id) { |
| case PROP_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; |
| } |
| } |
| |
| 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 PROP_NUM_BANDS: |
| g_value_set_uint (value, equ->freq_band_count); |
| break; |
| default: |
| G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); |
| break; |
| } |
| } |