1 /* GStreamer IIR equalizer
2 * Copyright (C) <2004> Benjamin Otte <otte@gnome.org>
3 * <2007> Stefan Kost <ensonic@users.sf.net>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 * Boston, MA 02111-1307, USA.
21 #ifndef __GST_IIR_EQUALIZER__
22 #define __GST_IIR_EQUALIZER__
24 #include <gst/audio/gstaudiofilter.h>
26 typedef struct _GstIirEqualizer GstIirEqualizer;
27 typedef struct _GstIirEqualizerClass GstIirEqualizerClass;
28 typedef struct _GstIirEqualizerBand GstIirEqualizerBand;
30 #define GST_TYPE_IIR_EQUALIZER \
31 (gst_iir_equalizer_get_type())
32 #define GST_IIR_EQUALIZER(obj) \
33 (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_IIR_EQUALIZER,GstIirEqualizer))
34 #define GST_IIR_EQUALIZER_CLASS(klass) \
35 (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_IIR_EQUALIZER,GstIirEqualizerClass))
36 #define GST_IS_IIR_EQUALIZER(obj) \
37 (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_IIR_EQUALIZER))
38 #define GST_IS_IIR_EQUALIZER_CLASS(klass) \
39 (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_IIR_EQUALIZER))
41 #define LOWEST_FREQ (20.0)
42 #define HIGHEST_FREQ (20000.0)
44 typedef void (*ProcessFunc) (GstIirEqualizer * eq, guint8 * data, guint size,
47 struct _GstIirEqualizer
49 GstAudioFilter audiofilter;
54 GstIirEqualizerBand **bands;
57 guint freq_band_count;
58 /* for each band and channel */
62 gboolean need_new_coefficients;
67 struct _GstIirEqualizerClass
69 GstAudioFilterClass audiofilter_class;
72 extern void gst_iir_equalizer_compute_frequencies (GstIirEqualizer * equ, guint new_count);
74 extern GType gst_iir_equalizer_get_type(void);
76 #endif /* __GST_IIR_EQUALIZER__ */