/* 

 * 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__ */