/* GStreamer IIR equalizer * Copyright (C) <2004> Benjamin Otte <otte@gnome.org> * <2007> Stefan Kost <ensonic@users.sf.net> * * 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., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, USA. */ #ifndef __GST_IIR_EQUALIZER__ #define __GST_IIR_EQUALIZER__ #include <gst/audio/gstaudiofilter.h> typedef struct _GstIirEqualizer GstIirEqualizer; typedef struct _GstIirEqualizerClass GstIirEqualizerClass; typedef struct _GstIirEqualizerBand GstIirEqualizerBand; #define GST_TYPE_IIR_EQUALIZER \ (gst_iir_equalizer_get_type()) #define GST_IIR_EQUALIZER(obj) \ (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_IIR_EQUALIZER,GstIirEqualizer)) #define GST_IIR_EQUALIZER_CLASS(klass) \ (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_IIR_EQUALIZER,GstIirEqualizerClass)) #define GST_IS_IIR_EQUALIZER(obj) \ (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_IIR_EQUALIZER)) #define GST_IS_IIR_EQUALIZER_CLASS(klass) \ (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_IIR_EQUALIZER)) #define LOWEST_FREQ (20.0) #define HIGHEST_FREQ (20000.0) typedef void (*ProcessFunc) (GstIirEqualizer * eq, guint8 * data, guint size, guint channels); struct _GstIirEqualizer { GstAudioFilter audiofilter; /*< private >*/ GMutex bands_lock; GstIirEqualizerBand **bands; /* properties */ guint freq_band_count; /* for each band and channel */ gpointer history; guint history_size; gboolean need_new_coefficients; ProcessFunc process; }; struct _GstIirEqualizerClass { GstAudioFilterClass audiofilter_class; }; extern void gst_iir_equalizer_compute_frequencies (GstIirEqualizer * equ, guint new_count); extern GType gst_iir_equalizer_get_type(void); #endif /* __GST_IIR_EQUALIZER__ */