| /* |
| * GStreamer |
| * Copyright (C) 2007-2009 Sebastian Dröge <sebastian.droege@collabora.co.uk> |
| * |
| * 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_AUDIO_FX_BASE_IIR_FILTER_H__ |
| #define __GST_AUDIO_FX_BASE_IIR_FILTER_H__ |
| |
| #include <gst/gst.h> |
| #include <gst/base/gstbasetransform.h> |
| #include <gst/audio/audio.h> |
| #include <gst/audio/gstaudiofilter.h> |
| |
| 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; |
| |
| gdouble *a; |
| guint na; |
| gdouble *b; |
| guint nb; |
| GstAudioFXBaseIIRFilterChannelCtx *channels; |
| guint nchannels; |
| |
| GMutex lock; |
| }; |
| |
| 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__ */ |