1 /* GStreamer IIR equalizer 2 * Copyright (C) <2004> Benjamin Otte <otte@gnome.org> 3 * <2007> Stefan Kost <ensonic@users.sf.net> 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_IIR_EQUALIZER__ 22 #define __GST_IIR_EQUALIZER__ 23 24 #include <gst/audio/gstaudiofilter.h> 25 26 typedef struct _GstIirEqualizer GstIirEqualizer; 27 typedef struct _GstIirEqualizerClass GstIirEqualizerClass; 28 typedef struct _GstIirEqualizerBand GstIirEqualizerBand; 29 30 #define GST_TYPE_IIR_EQUALIZER \ 31 (gst_iir_equalizer_get_type()) 32 #define GST_IIR_EQUALIZER(obj) \ 33 (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_IIR_EQUALIZER,GstIirEqualizer)) 34 #define GST_IIR_EQUALIZER_CLASS(klass) \ 35 (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_IIR_EQUALIZER,GstIirEqualizerClass)) 36 #define GST_IS_IIR_EQUALIZER(obj) \ 37 (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_IIR_EQUALIZER)) 38 #define GST_IS_IIR_EQUALIZER_CLASS(klass) \ 39 (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_IIR_EQUALIZER)) 40 41 #define LOWEST_FREQ (20.0) 42 #define HIGHEST_FREQ (20000.0) 43 44 typedef void (*ProcessFunc) (GstIirEqualizer * eq, guint8 * data, guint size, 45 guint channels); 46 47 struct _GstIirEqualizer 48 { 49 GstAudioFilter audiofilter; 50 51 /*< private >*/ 52 53 GMutex bands_lock; 54 GstIirEqualizerBand **bands; 55 56 /* properties */ 57 guint freq_band_count; 58 /* for each band and channel */ 59 gpointer history; 60 guint history_size; 61 62 gboolean need_new_coefficients; 63 64 ProcessFunc process; 65 }; 66 67 struct _GstIirEqualizerClass 68 { 69 GstAudioFilterClass audiofilter_class; 70 }; 71 72 extern void gst_iir_equalizer_compute_frequencies (GstIirEqualizer * equ, guint new_count); 73 74 extern GType gst_iir_equalizer_get_type(void); 75 76 #endif /* __GST_IIR_EQUALIZER__ */ 77