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>
25 #include <gst/audio/gstringbuffer.h>
27 typedef struct _GstIirEqualizer GstIirEqualizer;
28 typedef struct _GstIirEqualizerClass GstIirEqualizerClass;
29 typedef struct _GstIirEqualizerBand GstIirEqualizerBand;
31 #define GST_TYPE_IIR_EQUALIZER \
32 (gst_iir_equalizer_get_type())
33 #define GST_IIR_EQUALIZER(obj) \
34 (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_IIR_EQUALIZER,GstIirEqualizer))
35 #define GST_IIR_EQUALIZER_CLASS(klass) \
36 (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_IIR_EQUALIZER,GstIirEqualizerClass))
37 #define GST_IS_IIR_EQUALIZER(obj) \
38 (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_IIR_EQUALIZER))
39 #define GST_IS_IIR_EQUALIZER_CLASS(klass) \
40 (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_IIR_EQUALIZER))
42 #define LOWEST_FREQ (20.0)
43 #define HIGHEST_FREQ (20000.0)
45 typedef void (*ProcessFunc) (GstIirEqualizer * eq, guint8 * data, guint size,
48 struct _GstIirEqualizer
50 GstAudioFilter audiofilter;
55 GstIirEqualizerBand **bands;
58 guint freq_band_count;
59 /* for each band and channel */
63 gboolean need_new_coefficients;
68 struct _GstIirEqualizerClass
70 GstAudioFilterClass audiofilter_class;
73 extern void gst_iir_equalizer_compute_frequencies (GstIirEqualizer * equ, guint new_count);
75 extern GType gst_iir_equalizer_get_type(void);
77 #endif /* __GST_IIR_EQUALIZER__ */