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Diffstat (limited to 'gst/audiofx/audiofxbaseiirfilter.h')
-rw-r--r-- | gst/audiofx/audiofxbaseiirfilter.h | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/gst/audiofx/audiofxbaseiirfilter.h b/gst/audiofx/audiofxbaseiirfilter.h new file mode 100644 index 00000000..0534343c --- /dev/null +++ b/gst/audiofx/audiofxbaseiirfilter.h @@ -0,0 +1,77 @@ +/* + * 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., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, 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; + + gboolean have_coeffs; + gdouble *a; + guint na; + gdouble *b; + guint nb; + GstAudioFXBaseIIRFilterChannelCtx *channels; + guint nchannels; +}; + +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__ */ |