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105 lines
3.1 KiB
105 lines
3.1 KiB
/* GSL - Generic Sound Layer
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* Copyright (C) 2001-2002 Tim Janik
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GSL_OSC_TABLE_H__
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#define __GSL_OSC_TABLE_H__
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#include <gsl/gsldefs.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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/* --- structures & enums --- */
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typedef enum /*< skip >*/
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{
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GSL_OSC_WAVE_NONE,
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GSL_OSC_WAVE_SINE,
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GSL_OSC_WAVE_TRIANGLE,
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GSL_OSC_WAVE_SAW_RISE,
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GSL_OSC_WAVE_SAW_FALL,
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GSL_OSC_WAVE_PEAK_RISE,
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GSL_OSC_WAVE_PEAK_FALL,
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GSL_OSC_WAVE_MOOG_SAW,
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GSL_OSC_WAVE_SQUARE,
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GSL_OSC_WAVE_PULSE_SAW
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} GslOscWaveForm;
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typedef struct
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{
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gfloat mix_freq;
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GslOscWaveForm wave_form;
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gpointer entry_array;
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} GslOscTable;
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typedef struct
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{
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gfloat min_freq;
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gfloat max_freq;
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guint n_values;
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const gfloat *values; /* contains n_values+1 values with values[0]==values[n_values] */
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/* integer stepping (block size dependant) */
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guint32 n_frac_bits;
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guint32 frac_bitmask;
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gfloat freq_to_step; /* freq -> int.frac */
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gfloat phase_to_pos; /* 0..1 -> int.frac */
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gfloat ifrac_to_float; /* frac -> 0..1 float */
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guint min_pos, max_pos; /* pulse extension */
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} GslOscWave;
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/* --- oscillator table --- */
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GslOscTable* gsl_osc_table_create (gfloat mix_freq,
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GslOscWaveForm wave_form,
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double (*filter_func) (double),
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guint n_freqs,
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const gfloat *freqs);
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void gsl_osc_table_lookup (const GslOscTable *table,
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gfloat freq,
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GslOscWave *wave);
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void gsl_osc_table_free (GslOscTable *table);
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/* --- oscillator wave utils --- */
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void gsl_osc_wave_fill_buffer (GslOscWaveForm type,
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guint n_values,
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gfloat *values);
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void gsl_osc_wave_extrema (guint n_values,
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const gfloat *values,
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gfloat *min,
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gfloat *max);
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void gsl_osc_wave_normalize (guint n_values,
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gfloat *values,
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gfloat new_center,
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gfloat new_max);
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void gsl_osc_wave_adjust_range (guint n_values,
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gfloat *values,
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gfloat min,
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gfloat max,
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gfloat new_center,
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gfloat new_max);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __GSL_OSC_TABLE_H__ */
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