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/* GSL - Generic Sound Layer
* Copyright (C) 2001-2002 Tim Janik
*
* 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 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 Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef __GSL_OSC_TABLE_H__
#define __GSL_OSC_TABLE_H__
#include <gsl/gsldefs.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/* --- structures & enums --- */
typedef enum /*< skip >*/
{
GSL_OSC_WAVE_NONE,
GSL_OSC_WAVE_SINE,
GSL_OSC_WAVE_TRIANGLE,
GSL_OSC_WAVE_SAW_RISE,
GSL_OSC_WAVE_SAW_FALL,
GSL_OSC_WAVE_PEAK_RISE,
GSL_OSC_WAVE_PEAK_FALL,
GSL_OSC_WAVE_MOOG_SAW,
GSL_OSC_WAVE_SQUARE,
GSL_OSC_WAVE_PULSE_SAW
} GslOscWaveForm;
typedef struct
{
gfloat mix_freq;
GslOscWaveForm wave_form;
gpointer entry_array;
} GslOscTable;
typedef struct
{
gfloat min_freq;
gfloat max_freq;
guint n_values;
const gfloat *values; /* contains n_values+1 values with values[0]==values[n_values] */
/* integer stepping (block size dependant) */
guint32 n_frac_bits;
guint32 frac_bittqmask;
gfloat freq_to_step; /* freq -> int.frac */
gfloat phase_to_pos; /* 0..1 -> int.frac */
gfloat ifrac_to_float; /* frac -> 0..1 float */
guint min_pos, max_pos; /* pulse extension */
} GslOscWave;
/* --- oscillator table --- */
GslOscTable* gsl_osc_table_create (gfloat mix_freq,
GslOscWaveForm wave_form,
double (*filter_func) (double),
guint n_freqs,
const gfloat *freqs);
void gsl_osc_table_lookup (const GslOscTable *table,
gfloat freq,
GslOscWave *wave);
void gsl_osc_table_free (GslOscTable *table);
/* --- oscillator wave utils --- */
void gsl_osc_wave_fill_buffer (GslOscWaveForm type,
guint n_values,
gfloat *values);
void gsl_osc_wave_extrema (guint n_values,
const gfloat *values,
gfloat *min,
gfloat *max);
void gsl_osc_wave_normalize (guint n_values,
gfloat *values,
gfloat new_center,
gfloat new_max);
void gsl_osc_wave_adjust_range (guint n_values,
gfloat *values,
gfloat min,
gfloat max,
gfloat new_center,
gfloat new_max);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __GSL_OSC_TABLE_H__ */
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