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Original commit message from CVS: * gst/audiofx/Makefile.am: * gst/audiofx/audiofxbaseiirfilter.c: (gst_audio_fx_base_iir_filter_base_init), (gst_audio_fx_base_iir_filter_dispose), (gst_audio_fx_base_iir_filter_class_init), (gst_audio_fx_base_iir_filter_init), (gst_audio_fx_base_iir_filter_calculate_gain), (gst_audio_fx_base_iir_filter_set_coefficients), (gst_audio_fx_base_iir_filter_setup), (process), (gst_audio_fx_base_iir_filter_transform_ip), (gst_audio_fx_base_iir_filter_stop): * gst/audiofx/audiofxbaseiirfilter.h: Implement a base class for IIR filters. * gst/audiofx/audiochebband.c: (gst_audio_cheb_band_base_init), (gst_audio_cheb_band_class_init), (gst_audio_cheb_band_init), (generate_coefficients), (gst_audio_cheb_band_set_property), (gst_audio_cheb_band_setup): * gst/audiofx/audiochebband.h: * gst/audiofx/audiocheblimit.c: (gst_audio_cheb_limit_base_init), (gst_audio_cheb_limit_class_init), (gst_audio_cheb_limit_init), (generate_coefficients), (gst_audio_cheb_limit_set_property), (gst_audio_cheb_limit_setup): * gst/audiofx/audiocheblimit.h: Use the IIR filter base class for the chebyshev filters.
78 lines
2.9 KiB
C
78 lines
2.9 KiB
C
/*
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* GStreamer
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* Copyright (C) 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_AUDIO_FX_BASE_IIR_FILTER_H__
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#define __GST_AUDIO_FX_BASE_IIR_FILTER_H__
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#include <gst/gst.h>
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#include <gst/base/gstbasetransform.h>
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#include <gst/audio/audio.h>
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#include <gst/audio/gstaudiofilter.h>
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G_BEGIN_DECLS
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#define GST_TYPE_AUDIO_FX_BASE_IIR_FILTER (gst_audio_fx_base_iir_filter_get_type())
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#define GST_AUDIO_FX_BASE_IIR_FILTER(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_FX_BASE_IIR_FILTER,GstAudioFXBaseIIRFilter))
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#define GST_IS_AUDIO_FX_BASE_IIR_FILTER(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_FX_BASE_IIR_FILTER))
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#define GST_AUDIO_FX_BASE_IIR_FILTER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass) ,GST_TYPE_AUDIO_FX_BASE_IIR_FILTER,GstAudioFXBaseIIRFilterClass))
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#define GST_IS_AUDIO_FX_BASE_IIR_FILTER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass) ,GST_TYPE_AUDIO_FX_BASE_IIR_FILTER))
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#define GST_AUDIO_FX_BASE_IIR_FILTER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj) ,GST_TYPE_AUDIO_FX_BASE_IIR_FILTER,GstAudioFXBaseIIRFilterClass))
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typedef struct _GstAudioFXBaseIIRFilter GstAudioFXBaseIIRFilter;
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typedef struct _GstAudioFXBaseIIRFilterClass GstAudioFXBaseIIRFilterClass;
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typedef void (*GstAudioFXBaseIIRFilterProcessFunc) (GstAudioFXBaseIIRFilter *, guint8 *, guint);
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typedef struct
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{
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gdouble *x;
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gint x_pos;
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gdouble *y;
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gint y_pos;
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} GstAudioFXBaseIIRFilterChannelCtx;
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struct _GstAudioFXBaseIIRFilter
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{
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GstAudioFilter audiofilter;
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/* < private > */
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GstAudioFXBaseIIRFilterProcessFunc process;
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gboolean have_coeffs;
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gdouble *a;
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guint na;
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gdouble *b;
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guint nb;
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GstAudioFXBaseIIRFilterChannelCtx *channels;
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guint nchannels;
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};
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struct _GstAudioFXBaseIIRFilterClass
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{
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GstAudioFilterClass parent;
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};
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GType gst_audio_fx_base_iir_filter_get_type (void);
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void gst_audio_fx_base_iir_filter_set_coefficients (GstAudioFXBaseIIRFilter *filter, gdouble *a, guint na, gdouble *b, guint nb);
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gdouble gst_audio_fx_base_iir_filter_calculate_gain (gdouble *a, guint na, gdouble *b, guint nb, gdouble zr, gdouble zi);
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G_END_DECLS
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#endif /* __GST_AUDIO_FX_BASE_IIR_FILTER_H__ */
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