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__ */ 79