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Member "gst-plugins-good-1.20.3/gst/audiofx/audiofxbaseiirfilter.h" (15 Jun 2022, 2926 Bytes) of package /linux/misc/gst-plugins-good-1.20.3.tar.xz:


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    1 /* 
    2  * GStreamer
    3  * Copyright (C) 2007-2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
    4  *
    5  * This library is free software; you can redistribute it and/or
    6  * modify it under the terms of the GNU Library General Public
    7  * License as published by the Free Software Foundation; either
    8  * version 2 of the License, or (at your option) any later version.
    9  *
   10  * This library is distributed in the hope that it will be useful,
   11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   13  * Library General Public License for more details.
   14  *
   15  * You should have received a copy of the GNU Library General Public
   16  * License along with this library; if not, write to the
   17  * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
   18  * Boston, MA 02110-1301, USA.
   19  */
   20 
   21 #ifndef __GST_AUDIO_FX_BASE_IIR_FILTER_H__
   22 #define __GST_AUDIO_FX_BASE_IIR_FILTER_H__
   23 
   24 #include <gst/gst.h>
   25 #include <gst/base/gstbasetransform.h>
   26 #include <gst/audio/audio.h>
   27 #include <gst/audio/gstaudiofilter.h>
   28 
   29 G_BEGIN_DECLS
   30 
   31 #define GST_TYPE_AUDIO_FX_BASE_IIR_FILTER            (gst_audio_fx_base_iir_filter_get_type())
   32 #define GST_AUDIO_FX_BASE_IIR_FILTER(obj)            (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_FX_BASE_IIR_FILTER,GstAudioFXBaseIIRFilter))
   33 #define GST_IS_AUDIO_FX_BASE_IIR_FILTER(obj)         (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_FX_BASE_IIR_FILTER))
   34 #define GST_AUDIO_FX_BASE_IIR_FILTER_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST((klass) ,GST_TYPE_AUDIO_FX_BASE_IIR_FILTER,GstAudioFXBaseIIRFilterClass))
   35 #define GST_IS_AUDIO_FX_BASE_IIR_FILTER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass) ,GST_TYPE_AUDIO_FX_BASE_IIR_FILTER))
   36 #define GST_AUDIO_FX_BASE_IIR_FILTER_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS((obj) ,GST_TYPE_AUDIO_FX_BASE_IIR_FILTER,GstAudioFXBaseIIRFilterClass))
   37 typedef struct _GstAudioFXBaseIIRFilter GstAudioFXBaseIIRFilter;
   38 typedef struct _GstAudioFXBaseIIRFilterClass GstAudioFXBaseIIRFilterClass;
   39 
   40 typedef void (*GstAudioFXBaseIIRFilterProcessFunc) (GstAudioFXBaseIIRFilter *, guint8 *, guint);
   41 
   42 typedef struct
   43 {
   44   gdouble *x;
   45   gint x_pos;
   46   gdouble *y;
   47   gint y_pos;
   48 } GstAudioFXBaseIIRFilterChannelCtx;
   49 
   50 struct _GstAudioFXBaseIIRFilter
   51 {
   52   GstAudioFilter audiofilter;
   53 
   54   /* < private > */
   55   GstAudioFXBaseIIRFilterProcessFunc process;
   56 
   57   gdouble *a;
   58   guint na;
   59   gdouble *b;
   60   guint nb;
   61   GstAudioFXBaseIIRFilterChannelCtx *channels;
   62   guint nchannels;
   63 
   64   GMutex lock;
   65 };
   66 
   67 struct _GstAudioFXBaseIIRFilterClass
   68 {
   69   GstAudioFilterClass parent;
   70 };
   71 
   72 GType gst_audio_fx_base_iir_filter_get_type (void);
   73 void gst_audio_fx_base_iir_filter_set_coefficients (GstAudioFXBaseIIRFilter *filter, gdouble *a, guint na, gdouble *b, guint nb);
   74 gdouble gst_audio_fx_base_iir_filter_calculate_gain (gdouble *a, guint na, gdouble *b, guint nb, gdouble zr, gdouble zi);
   75 
   76 G_END_DECLS
   77 
   78 #endif /* __GST_AUDIO_FX_BASE_IIR_FILTER_H__ */