From 4c7c4c00dacff24aaef55b46a8bc31687d833ca7 Mon Sep 17 00:00:00 2001 From: Sebastian Dröge Date: Mon, 5 Jan 2009 10:13:29 +0000 Subject: gst/audiofx/: Implement a base class for IIR filters. 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. --- gst/audiofx/audiofxbaseiirfilter.h | 77 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 gst/audiofx/audiofxbaseiirfilter.h (limited to 'gst/audiofx/audiofxbaseiirfilter.h') diff --git a/gst/audiofx/audiofxbaseiirfilter.h b/gst/audiofx/audiofxbaseiirfilter.h new file mode 100644 index 00000000..0534343c --- /dev/null +++ b/gst/audiofx/audiofxbaseiirfilter.h @@ -0,0 +1,77 @@ +/* + * GStreamer + * Copyright (C) 2007-2009 Sebastian Dröge + * + * 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_AUDIO_FX_BASE_IIR_FILTER_H__ +#define __GST_AUDIO_FX_BASE_IIR_FILTER_H__ + +#include +#include +#include +#include + +G_BEGIN_DECLS + +#define GST_TYPE_AUDIO_FX_BASE_IIR_FILTER (gst_audio_fx_base_iir_filter_get_type()) +#define GST_AUDIO_FX_BASE_IIR_FILTER(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_FX_BASE_IIR_FILTER,GstAudioFXBaseIIRFilter)) +#define GST_IS_AUDIO_FX_BASE_IIR_FILTER(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_FX_BASE_IIR_FILTER)) +#define GST_AUDIO_FX_BASE_IIR_FILTER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass) ,GST_TYPE_AUDIO_FX_BASE_IIR_FILTER,GstAudioFXBaseIIRFilterClass)) +#define GST_IS_AUDIO_FX_BASE_IIR_FILTER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass) ,GST_TYPE_AUDIO_FX_BASE_IIR_FILTER)) +#define GST_AUDIO_FX_BASE_IIR_FILTER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj) ,GST_TYPE_AUDIO_FX_BASE_IIR_FILTER,GstAudioFXBaseIIRFilterClass)) +typedef struct _GstAudioFXBaseIIRFilter GstAudioFXBaseIIRFilter; +typedef struct _GstAudioFXBaseIIRFilterClass GstAudioFXBaseIIRFilterClass; + +typedef void (*GstAudioFXBaseIIRFilterProcessFunc) (GstAudioFXBaseIIRFilter *, guint8 *, guint); + +typedef struct +{ + gdouble *x; + gint x_pos; + gdouble *y; + gint y_pos; +} GstAudioFXBaseIIRFilterChannelCtx; + +struct _GstAudioFXBaseIIRFilter +{ + GstAudioFilter audiofilter; + + /* < private > */ + GstAudioFXBaseIIRFilterProcessFunc process; + + gboolean have_coeffs; + gdouble *a; + guint na; + gdouble *b; + guint nb; + GstAudioFXBaseIIRFilterChannelCtx *channels; + guint nchannels; +}; + +struct _GstAudioFXBaseIIRFilterClass +{ + GstAudioFilterClass parent; +}; + +GType gst_audio_fx_base_iir_filter_get_type (void); +void gst_audio_fx_base_iir_filter_set_coefficients (GstAudioFXBaseIIRFilter *filter, gdouble *a, guint na, gdouble *b, guint nb); +gdouble gst_audio_fx_base_iir_filter_calculate_gain (gdouble *a, guint na, gdouble *b, guint nb, gdouble zr, gdouble zi); + +G_END_DECLS + +#endif /* __GST_AUDIO_FX_BASE_IIR_FILTER_H__ */ -- cgit