gstreamer/gst/audiofx/audiowsincband.h
2021-03-29 12:45:22 +02:00

82 lines
2.5 KiB
C

/* -*- c-basic-offset: 2 -*-
*
* GStreamer
* Copyright (C) 1999-2001 Erik Walthinsen <omega@cse.ogi.edu>
* 2006 Dreamlab Technologies Ltd. <mathis.hofer@dreamlab.net>
* 2007-2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*
* this windowed sinc filter is taken from the freely downloadable DSP book,
* "The Scientist and Engineer's Guide to Digital Signal Processing",
* chapter 16
* available at http://www.dspguide.com/
*
*/
#ifndef __GST_AUDIO_WSINC_BAND_H__
#define __GST_AUDIO_WSINC_BAND_H__
#include <gst/gst.h>
#include <gst/audio/gstaudiofilter.h>
#include "audiofxbasefirfilter.h"
G_BEGIN_DECLS
#define GST_TYPE_AUDIO_WSINC_BAND \
(gst_audio_wsincband_get_type())
#define GST_AUDIO_WSINC_BAND(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_WSINC_BAND,GstAudioWSincBand))
#define GST_AUDIO_WSINC_BAND_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_AUDIO_WSINC_BAND,GstAudioWSincBandClass))
#define GST_IS_AUDIO_WSINC_BAND(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_WSINC_BAND))
#define GST_IS_AUDIO_WSINC_BAND_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AUDIO_WSINC_BAND))
typedef struct _GstAudioWSincBand GstAudioWSincBand;
typedef struct _GstAudioWSincBandClass GstAudioWSincBandClass;
/**
* GstAudioWSincBand:
*
* Opaque data structure.
*/
struct _GstAudioWSincBand {
GstAudioFXBaseFIRFilter parent;
gint mode;
gint window;
gfloat lower_frequency, upper_frequency;
gint kernel_length; /* length of the filter kernel */
/* < private > */
GMutex lock;
};
struct _GstAudioWSincBandClass {
GstAudioFilterClass parent;
};
GType gst_audio_wsincband_get_type (void);
GST_ELEMENT_REGISTER_DECLARE (audiowsincband);
G_END_DECLS
#endif /* __GST_AUDIO_WSINC_BAND_H__ */