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