/usr/include/bse/gslosctable.hh is in libbse-dev 0.7.8-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#ifndef __GSL_OSC_TABLE_H__
#define __GSL_OSC_TABLE_H__
#include <bse/gsldefs.hh>
#include <sfi/gbsearcharray.hh>
G_BEGIN_DECLS
/* --- 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;
GBSearchArray *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_bitmask;
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);
const gchar* gsl_osc_wave_form_name (GslOscWaveForm wave_form);
G_END_DECLS
#endif /* __GSL_OSC_TABLE_H__ */
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