1 /* |
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2 * GStreamer |
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3 * Copyright (C) 2007-2009 Sebastian Dröge <sebastian.droege@collabora.co.uk> |
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4 * |
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5 * This library is free software; you can redistribute it and/or |
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6 * modify it under the terms of the GNU Library General Public |
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7 * License as published by the Free Software Foundation; either |
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8 * version 2 of the License, or (at your option) any later version. |
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9 * |
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10 * This library is distributed in the hope that it will be useful, |
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 * Library General Public License for more details. |
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14 * |
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15 * You should have received a copy of the GNU Library General Public |
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16 * License along with this library; if not, write to the |
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17 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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18 * Boston, MA 02111-1307, USA. |
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19 */ |
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20 |
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21 #ifndef __GST_AUDIO_FX_BASE_IIR_FILTER_H__ |
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22 #define __GST_AUDIO_FX_BASE_IIR_FILTER_H__ |
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23 |
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24 #include <gst/gst.h> |
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25 #include <gst/gst_global.h> |
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26 #include <gst/base/gstbasetransform.h> |
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27 #include <gst/audio/audio.h> |
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28 #include <gst/audio/gstaudiofilter.h> |
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29 |
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30 G_BEGIN_DECLS |
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31 |
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32 #define GST_TYPE_AUDIO_FX_BASE_IIR_FILTER (gst_audio_fx_base_iir_filter_get_type()) |
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33 #define GST_AUDIO_FX_BASE_IIR_FILTER(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_FX_BASE_IIR_FILTER,GstAudioFXBaseIIRFilter)) |
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34 #define GST_IS_AUDIO_FX_BASE_IIR_FILTER(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_FX_BASE_IIR_FILTER)) |
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35 #define GST_AUDIO_FX_BASE_IIR_FILTER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass) ,GST_TYPE_AUDIO_FX_BASE_IIR_FILTER,GstAudioFXBaseIIRFilterClass)) |
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36 #define GST_IS_AUDIO_FX_BASE_IIR_FILTER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass) ,GST_TYPE_AUDIO_FX_BASE_IIR_FILTER)) |
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37 #define GST_AUDIO_FX_BASE_IIR_FILTER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj) ,GST_TYPE_AUDIO_FX_BASE_IIR_FILTER,GstAudioFXBaseIIRFilterClass)) |
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38 typedef struct _GstAudioFXBaseIIRFilter GstAudioFXBaseIIRFilter; |
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39 typedef struct _GstAudioFXBaseIIRFilterClass GstAudioFXBaseIIRFilterClass; |
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40 |
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41 typedef void (*GstAudioFXBaseIIRFilterProcessFunc) (GstAudioFXBaseIIRFilter *, guint8 *, guint); |
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42 |
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43 typedef struct |
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44 { |
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45 gdouble *x; |
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46 gint x_pos; |
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47 gdouble *y; |
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48 gint y_pos; |
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49 } GstAudioFXBaseIIRFilterChannelCtx; |
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50 |
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51 struct _GstAudioFXBaseIIRFilter |
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52 { |
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53 GstAudioFilter audiofilter; |
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54 |
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55 /* < private > */ |
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56 GstAudioFXBaseIIRFilterProcessFunc process; |
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57 |
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58 gboolean have_coeffs; |
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59 gdouble *a; |
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60 guint na; |
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61 gdouble *b; |
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62 guint nb; |
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63 GstAudioFXBaseIIRFilterChannelCtx *channels; |
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64 guint nchannels; |
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65 }; |
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66 |
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67 struct _GstAudioFXBaseIIRFilterClass |
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68 { |
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69 GstAudioFilterClass parent; |
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70 }; |
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71 #ifdef __SYMBIAN32__ |
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72 IMPORT_C |
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73 #endif |
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74 |
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75 |
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76 GType gst_audio_fx_base_iir_filter_get_type (void); |
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77 void gst_audio_fx_base_iir_filter_set_coefficients (GstAudioFXBaseIIRFilter *filter, gdouble *a, guint na, gdouble *b, guint nb); |
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78 gdouble gst_audio_fx_base_iir_filter_calculate_gain (gdouble *a, guint na, gdouble *b, guint nb, gdouble zr, gdouble zi); |
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79 |
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80 G_END_DECLS |
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81 |
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82 #endif /* __GST_AUDIO_FX_BASE_IIR_FILTER_H__ */ |
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