mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-01 06:01:04 +00:00
78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
|
/* GStreamer IIR equalizer
|
||
|
|
* Copyright (C) <2004> Benjamin Otte <otte@gnome.org>
|
||
|
|
*
|
||
|
|
* 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., 59 Temple Place - Suite 330,
|
||
|
|
* Boston, MA 02111-1307, USA.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef __GST_IIR_EQUALIZER__
|
||
|
|
#define __GST_IIR_EQUALIZER__
|
||
|
|
|
||
|
|
#include <gst/audio/gstaudiofilter.h>
|
||
|
|
#include <gst/audio/gstringbuffer.h>
|
||
|
|
|
||
|
|
typedef struct _GstIirEqualizer GstIirEqualizer;
|
||
|
|
typedef struct _GstIirEqualizerClass GstIirEqualizerClass;
|
||
|
|
|
||
|
|
#define GST_TYPE_IIR_EQUALIZER \
|
||
|
|
(gst_iir_equalizer_get_type())
|
||
|
|
#define GST_IIR_EQUALIZER(obj) \
|
||
|
|
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_IIR_EQUALIZER,GstIirEqualizer))
|
||
|
|
#define GST_IIR_EQUALIZER_CLASS(klass) \
|
||
|
|
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_IIR_EQUALIZER,GstIirEqualizerClass))
|
||
|
|
#define GST_IS_IIR_EQUALIZER(obj) \
|
||
|
|
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_IIR_EQUALIZER))
|
||
|
|
#define GST_IS_IIR_EQUALIZER_CLASS(klass) \
|
||
|
|
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_IIR_EQUALIZER))
|
||
|
|
|
||
|
|
#define LOWEST_FREQ (20.0)
|
||
|
|
#define HIGHEST_FREQ (20000.0)
|
||
|
|
|
||
|
|
typedef void (*ProcessFunc) (GstIirEqualizer * eq, guint8 * data, guint size,
|
||
|
|
guint channels);
|
||
|
|
|
||
|
|
typedef struct
|
||
|
|
{
|
||
|
|
gdouble alpha; /* IIR coefficients for outputs */
|
||
|
|
gdouble beta; /* IIR coefficients for inputs */
|
||
|
|
gdouble gamma; /* IIR coefficients for inputs */
|
||
|
|
} SecondOrderFilter;
|
||
|
|
|
||
|
|
struct _GstIirEqualizer
|
||
|
|
{
|
||
|
|
GstAudioFilter audiofilter;
|
||
|
|
|
||
|
|
/*< private >*/
|
||
|
|
|
||
|
|
/* properties */
|
||
|
|
guint freq_count;
|
||
|
|
gdouble band_width;
|
||
|
|
gdouble *freqs;
|
||
|
|
gdouble *values;
|
||
|
|
|
||
|
|
/* data */
|
||
|
|
SecondOrderFilter *filter;
|
||
|
|
gpointer history;
|
||
|
|
ProcessFunc process;
|
||
|
|
guint history_size;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct _GstIirEqualizerClass
|
||
|
|
{
|
||
|
|
GstAudioFilterClass audiofilter_class;
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif /* __GST_IIR_EQUALIZER__ */
|