mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-30 21:51:09 +00:00
c17d49ee20
Original commit message from CVS: * gst/equalizer/gstiirequalizer.c: (gst_iir_equalizer_band_set_property), (gst_iir_equalizer_init), (setup_filter), (set_passthrough), (update_coefficients), (gst_iir_equalizer_compute_frequencies), (gst_iir_equalizer_transform_ip): * gst/equalizer/gstiirequalizer.h: Update the filter coefficients only when needed in the transform_ip function and correctly set the element into passthrough mode if the gain of all bands is 0.
77 lines
2.4 KiB
C
77 lines
2.4 KiB
C
/* GStreamer IIR equalizer
|
|
* 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., 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>
|
|
#include <gst/controller/gstcontroller.h>
|
|
|
|
typedef struct _GstIirEqualizer GstIirEqualizer;
|
|
typedef struct _GstIirEqualizerClass GstIirEqualizerClass;
|
|
typedef struct _GstIirEqualizerBand GstIirEqualizerBand;
|
|
|
|
#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);
|
|
|
|
struct _GstIirEqualizer
|
|
{
|
|
GstAudioFilter audiofilter;
|
|
|
|
/*< private >*/
|
|
|
|
GstIirEqualizerBand **bands;
|
|
|
|
/* properties */
|
|
guint freq_band_count;
|
|
/* for each band and channel */
|
|
gpointer history;
|
|
guint history_size;
|
|
|
|
gboolean need_new_coefficients;
|
|
|
|
ProcessFunc process;
|
|
};
|
|
|
|
struct _GstIirEqualizerClass
|
|
{
|
|
GstAudioFilterClass audiofilter_class;
|
|
};
|
|
|
|
extern void gst_iir_equalizer_compute_frequencies (GstIirEqualizer * equ, guint new_count);
|
|
|
|
extern GType gst_iir_equalizer_get_type(void);
|
|
|
|
#endif /* __GST_IIR_EQUALIZER__ */
|