/* 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;

  }

}