audiowsincband.h 2.46 KB
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/* -*- c-basic-offset: 2 -*-
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 *
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 * GStreamer
 * Copyright (C) 1999-2001 Erik Walthinsen <omega@cse.ogi.edu>
 *               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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 *
 * 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
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 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
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 *
 *
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 * 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/
 *
 */

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#ifndef __GST_AUDIO_WSINC_BAND_H__
#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) \
  (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))
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typedef struct _GstAudioWSincBand GstAudioWSincBand;
typedef struct _GstAudioWSincBandClass GstAudioWSincBandClass;
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/**
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 * GstAudioWSincBand:
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 *
 * Opaque data structure.
 */
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struct _GstAudioWSincBand {
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  GstAudioFXBaseFIRFilter parent;
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  gint mode;
  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__ */