1 files changed, 96 insertions, 0 deletions
diff --git a/flow/gsl/gslwaveosc.h b/flow/gsl/gslwaveosc.h
new file mode 100644
index 0000000..c41b207
--- /dev/null
+++ b/flow/gsl/gslwaveosc.h
@@ -0,0 +1,96 @@
+/* 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., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, 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__ */