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78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
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/* GStreamer IIR equalizer
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* Copyright (C) <2004> Benjamin Otte <otte@gnome.org>
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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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#ifndef __GST_IIR_EQUALIZER__
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#define __GST_IIR_EQUALIZER__
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#include <gst/audio/gstaudiofilter.h>
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#include <gst/audio/gstringbuffer.h>
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typedef struct _GstIirEqualizer GstIirEqualizer;
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typedef struct _GstIirEqualizerClass GstIirEqualizerClass;
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#define GST_TYPE_IIR_EQUALIZER \
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(gst_iir_equalizer_get_type())
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#define GST_IIR_EQUALIZER(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_IIR_EQUALIZER,GstIirEqualizer))
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#define GST_IIR_EQUALIZER_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_IIR_EQUALIZER,GstIirEqualizerClass))
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#define GST_IS_IIR_EQUALIZER(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_IIR_EQUALIZER))
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#define GST_IS_IIR_EQUALIZER_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_IIR_EQUALIZER))
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#define LOWEST_FREQ (20.0)
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#define HIGHEST_FREQ (20000.0)
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typedef void (*ProcessFunc) (GstIirEqualizer * eq, guint8 * data, guint size,
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guint channels);
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typedef struct
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{
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gdouble alpha; /* IIR coefficients for outputs */
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gdouble beta; /* IIR coefficients for inputs */
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gdouble gamma; /* IIR coefficients for inputs */
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} SecondOrderFilter;
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struct _GstIirEqualizer
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{
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GstAudioFilter audiofilter;
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/*< private >*/
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/* properties */
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guint freq_count;
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gdouble band_width;
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gdouble *freqs;
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gdouble *values;
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/* data */
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SecondOrderFilter *filter;
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gpointer history;
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ProcessFunc process;
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guint history_size;
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};
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struct _GstIirEqualizerClass
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{
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GstAudioFilterClass audiofilter_class;
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};
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#endif /* __GST_IIR_EQUALIZER__ */
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