1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/* GSL - Generic Sound Layer
* Copyright (C) 1999, 2000-2002 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.
*/
#include "gsloscillator.h"
#include "gslsignal.h"
#define SIGNAL_LEVEL_INVAL (-2.0) /* trigger level-changed checks */
/* --- functions --- */
static inline void
osc_update_pwm_offset (GslOscData *osc,
gfloat pulse_mod) /* -1..+1 */
{
guint32 maxp_offs, minp_offs, mpos, tpos;
gfloat min, max, foffset;
/* figure actual pulse width (0..1) */
foffset = osc->config.pulse_width; /* 0..1 */
foffset += pulse_mod * osc->config.pulse_mod_strength;
foffset = CLAMP (foffset, 0.0, 1.0);
/* calculate pulse scaling range for this offset */
osc->pwm_offset = foffset * osc->wave.n_values;
osc->pwm_offset <<= osc->wave.n_frac_bits;
maxp_offs = (osc->wave.min_pos + osc->wave.n_values + osc->wave.max_pos) << (osc->wave.n_frac_bits - 1);
minp_offs = (osc->wave.max_pos + osc->wave.min_pos) << (osc->wave.n_frac_bits - 1);
mpos = maxp_offs + (osc->pwm_offset >> 1);
tpos = mpos >> osc->wave.n_frac_bits;
max = osc->wave.values[tpos];
mpos -= osc->pwm_offset;
tpos = mpos >> osc->wave.n_frac_bits;
max -= osc->wave.values[tpos];
mpos = minp_offs + (osc->pwm_offset >> 1);
tpos = mpos >> osc->wave.n_frac_bits;
min = osc->wave.values[tpos];
mpos -= osc->pwm_offset;
tpos = mpos >> osc->wave.n_frac_bits;
min -= osc->wave.values[tpos];
osc->pwm_center = (min + max) / -2.0;
min = fabs (min + osc->pwm_center);
max = fabs (max + osc->pwm_center);
max = MAX (max, min);
if_reject (max < GSL_FLOAT_MIN_NORMAL)
{
osc->pwm_center = foffset < 0.5 ? -1.0 : +1.0;
osc->pwm_max = 1.0;
}
else
osc->pwm_max = 1.0 / max;
}
/* --- generate processing function variants --- */
#define OSC_FLAG_INVAL (0xffffffff)
#define OSC_FLAG_ISYNC (1)
#define OSC_FLAG_OSYNC (2)
#define OSC_FLAG_FREQ (4)
#define OSC_FLAG_SELF_MOD (8)
#define OSC_FLAG_LINEAR_MOD (16)
#define OSC_FLAG_EXP_MOD (32)
#define OSC_FLAG_PWM_MOD (64)
#define OSC_FLAG_PULSE_OSC (128)
/* normal oscillator variants */
#define OSC_INCLUDER_FLAGS 0
#define GSL_INCLUDER_FIRST_CASE 0
#define GSL_INCLUDER_LAST_CASE 63
#define GSL_INCLUDER_NAME oscillator_process_normal
#define GSL_INCLUDER_TABLE static void (*osc_process_table[]) (GslOscData*,guint, \
const gfloat*,const gfloat*,const gfloat*, \
const gfloat*,gfloat*,gfloat*)
#define GSL_INCLUDER_FILE "gsloscillator-aux.c"
#include "gslincluder.c"
#undef OSC_INCLUDER_FLAGS
/* pulse width modulation oscillator variants */
#define OSC_INCLUDER_FLAGS OSC_FLAG_PULSE_OSC
#define GSL_INCLUDER_FIRST_CASE 0
#define GSL_INCLUDER_LAST_CASE 127
#define GSL_INCLUDER_NAME oscillator_process_pulse
#define GSL_INCLUDER_TABLE static void (*osc_process_pulse_table[]) (GslOscData*,guint, \
const gfloat*,const gfloat*,const gfloat*, \
const gfloat*,gfloat*,gfloat*)
#define GSL_INCLUDER_FILE "gsloscillator-aux.c"
#include "gslincluder.c"
#undef OSC_INCLUDER_FLAGS
/* --- functions --- */
static inline void
osc_process (GslOscData *osc,
guint n_values,
guint mode,
const gfloat *ifreq,
const gfloat *imod,
const gfloat *isync,
const gfloat *ipwm,
gfloat *mono_out,
gfloat *sync_out)
{
mode |= isync ? OSC_FLAG_ISYNC : 0;
mode |= sync_out ? OSC_FLAG_OSYNC : 0;
mode |= ifreq ? OSC_FLAG_FREQ : 0;
if (osc->config.pulse_mod_strength > GSL_FLOAT_MIN_NORMAL)
mode |= ipwm ? OSC_FLAG_PWM_MOD : 0;
if (osc->config.self_fm_strength > GSL_FLOAT_MIN_NORMAL)
mode |= OSC_FLAG_SELF_MOD;
if (imod && osc->config.exponential_fm)
mode |= OSC_FLAG_EXP_MOD;
else if (imod)
mode |= OSC_FLAG_LINEAR_MOD;
if_reject (mode != osc->last_mode)
{
guint change_tqmask = osc->last_mode >= OSC_FLAG_INVAL ? OSC_FLAG_INVAL : osc->last_mode ^ mode;
if (change_tqmask & OSC_FLAG_FREQ)
{
gdouble fcpos, flpos;
fcpos = osc->cur_pos * osc->wave.ifrac_to_float;
flpos = osc->last_pos * osc->wave.ifrac_to_float;
osc->last_freq_level = osc->config.cfreq;
gsl_osc_table_lookup (osc->config.table, osc->last_freq_level, &osc->wave);
osc->last_pos = flpos / osc->wave.ifrac_to_float;
osc->cur_pos = fcpos / osc->wave.ifrac_to_float;
}
if (!(mode & OSC_FLAG_ISYNC))
osc->last_sync_level = 0;
if (mode & OSC_FLAG_PULSE_OSC)
{
osc->last_pwm_level = 0;
osc_update_pwm_offset (osc, osc->last_pwm_level);
}
osc->last_mode = mode;
}
/* invoke generated function variant */
if (mode & OSC_FLAG_PULSE_OSC)
osc_process_pulse_table[mode & ~OSC_FLAG_PULSE_OSC] (osc, n_values,
ifreq, imod, isync, ipwm,
mono_out, sync_out);
else
osc_process_table[mode] (osc, n_values,
ifreq, imod, isync, NULL,
mono_out, sync_out);
}
void
gsl_osc_process (GslOscData *osc,
guint n_values,
const gfloat *ifreq,
const gfloat *imod,
const gfloat *isync,
gfloat *mono_out,
gfloat *sync_out)
{
g_return_if_fail (osc != NULL);
g_return_if_fail (n_values > 0);
g_return_if_fail (mono_out != NULL);
if (osc->last_mode & OSC_FLAG_PULSE_OSC)
osc->last_mode = OSC_FLAG_INVAL;
osc_process (osc, n_values, 0,
ifreq, imod, isync, NULL,
mono_out, sync_out);
}
void
gsl_osc_process_pulse (GslOscData *osc,
guint n_values,
const gfloat *ifreq,
const gfloat *imod,
const gfloat *isync,
const gfloat *ipwm,
gfloat *mono_out,
gfloat *sync_out)
{
g_return_if_fail (osc != NULL);
g_return_if_fail (n_values > 0);
g_return_if_fail (mono_out != NULL);
if (!(osc->last_mode & OSC_FLAG_PULSE_OSC))
osc->last_mode = OSC_FLAG_INVAL;
osc_process (osc, n_values, OSC_FLAG_PULSE_OSC,
ifreq, imod, isync, ipwm,
mono_out, sync_out);
}
void
gsl_osc_config (GslOscData *osc,
GslOscConfig *config)
{
g_return_if_fail (osc != NULL);
g_return_if_fail (config != NULL);
g_return_if_fail (config->table != NULL);
osc->config = *config;
osc->last_mode = OSC_FLAG_INVAL;
}
|