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97 lines
2.9 KiB
97 lines
2.9 KiB
15 years ago
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/* GSL - Generic Sound Layer
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* Copyright (C) 2001-2002 Tim Janik and Stefan Westerfeld
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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., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GSL_WAVE_OSC_H__
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#define __GSL_WAVE_OSC_H__
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#include <gsl/gsldefs.h>
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#include <gsl/gslwavechunk.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#define GSL_WAVE_OSC_FILTER_ORDER (8) /* <= GslConfig.wave_chunk_padding ! */
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typedef struct
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{
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GslLong start_offset;
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gint play_dir, channel;
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gpointer wchunk_data;
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GslWaveChunk* (*wchunk_from_freq) (gpointer wchunk_data,
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gfloat freq);
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gfloat fm_strength; /* linear: 0..1, exponential: n_octaves */
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guint exponential_fm : 1;
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gfloat cfreq; /* for ifreq == NULL */
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} GslWaveOscConfig;
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typedef struct
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{
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GslWaveOscConfig config;
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guint last_mode;
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gfloat last_sync_level, last_freq_level, last_mod_level;
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GslWaveChunkBlock block;
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gfloat *x; /* pointer into block */
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guint cur_pos, istep; /* FIXME */
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gdouble a[GSL_WAVE_OSC_FILTER_ORDER + 1]; /* order */
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gdouble b[GSL_WAVE_OSC_FILTER_ORDER + 1]; /* reversed order */
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gdouble y[GSL_WAVE_OSC_FILTER_ORDER + 1];
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guint j; /* y[] index */
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GslWaveChunk *wchunk;
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gfloat mix_freq; /* gsl_engine_sample_freq() */
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gfloat step_factor;
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gboolean done; /* FIXME. caution, this is TRUE only if
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* (play_dir < 0 && cur_pos < 0) ||
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* (play_dir > 0 && cur_pos > wchunk.length)
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*/
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} GslWaveOscData;
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void gsl_wave_osc_config (GslWaveOscData *wosc,
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GslWaveOscConfig *config);
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gboolean gsl_wave_osc_process (GslWaveOscData *wosc,
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guint n_values,
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const gfloat *ifreq,
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const gfloat *mod,
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const gfloat *sync,
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gfloat *mono_out);
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void gsl_wave_osc_retrigger (GslWaveOscData *wosc,
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gfloat freq);
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void gsl_wave_osc_set_filter (GslWaveOscData *wosc,
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gfloat freq,
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gboolean clear_state);
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void gsl_wave_osc_init (GslWaveOscData *wosc);
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void gsl_wave_osc_shutdown (GslWaveOscData *wosc);
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/* setup:
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* wosc = g_new0 (GslWaveOscData, 1);
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* wosc->mix_freq = gsl_engine_sample_freq ();
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*/
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __GSL_WAVE_OSC_H__ */
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