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/* GSL - Generic Sound Layer
* Copyright (C) 2001-2002 Tim Janik and Stefan Westerfeld
*
* 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_WAVE_OSC_H__
#define __GSL_WAVE_OSC_H__
#include <gsl/gsldefs.h>
#include <gsl/gslwavechunk.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#define GSL_WAVE_OSC_FILTER_ORDER (8) /* <= GslConfig.wave_chunk_padding ! */
typedef struct
{
GslLong start_offset;
gint play_dir, channel;
gpointer wchunk_data;
GslWaveChunk* (*wchunk_from_freq) (gpointer wchunk_data,
gfloat freq);
gfloat fm_strength; /* linear: 0..1, exponential: n_octaves */
guint exponential_fm : 1;
gfloat cfreq; /* for ifreq == NULL */
} GslWaveOscConfig;
typedef struct
{
GslWaveOscConfig config;
guint last_mode;
gfloat last_sync_level, last_freq_level, last_mod_level;
GslWaveChunkBlock block;
gfloat *x; /* pointer into block */
guint cur_pos, istep; /* FIXME */
gdouble a[GSL_WAVE_OSC_FILTER_ORDER + 1]; /* order */
gdouble b[GSL_WAVE_OSC_FILTER_ORDER + 1]; /* reversed order */
gdouble y[GSL_WAVE_OSC_FILTER_ORDER + 1];
guint j; /* y[] index */
GslWaveChunk *wchunk;
gfloat mix_freq; /* gsl_engine_sample_freq() */
gfloat step_factor;
gboolean done; /* FIXME. caution, this is TRUE only if
* (play_dir < 0 && cur_pos < 0) ||
* (play_dir > 0 && cur_pos > wchunk.length)
*/
} GslWaveOscData;
void gsl_wave_osc_config (GslWaveOscData *wosc,
GslWaveOscConfig *config);
gboolean gsl_wave_osc_process (GslWaveOscData *wosc,
guint n_values,
const gfloat *ifreq,
const gfloat *mod,
const gfloat *sync,
gfloat *mono_out);
void gsl_wave_osc_retrigger (GslWaveOscData *wosc,
gfloat freq);
void gsl_wave_osc_set_filter (GslWaveOscData *wosc,
gfloat freq,
gboolean clear_state);
void gsl_wave_osc_init (GslWaveOscData *wosc);
void gsl_wave_osc_shutdown (GslWaveOscData *wosc);
/* setup:
* wosc = g_new0 (GslWaveOscData, 1);
* wosc->mix_freq = gsl_engine_sample_freq ();
*/
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __GSL_WAVE_OSC_H__ */
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