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
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
|
/* 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.
*/
#define CHECK_SYNC (WOSC_MIX_VARIANT & WOSC_MIX_WITH_SYNC)
#define CHECK_FREQ (WOSC_MIX_VARIANT & WOSC_MIX_WITH_FREQ)
#define CHECK_MOD (WOSC_MIX_VARIANT & WOSC_MIX_WITH_MOD)
#define EXPONENTIAL_FM (WOSC_MIX_VARIANT & WOSC_MIX_WITH_EXP_FM)
#define DIRSTRIDE(b) (b->dirstride) /* (1) change for n_channel stepping */
static void
WOSC_MIX_VARIANT_NAME (GslWaveOscData *wosc,
guint n_values,
const gfloat *freq_in,
const gfloat *mod_in,
const gfloat *sync_in,
gfloat *wave_out)
{
gfloat *wave_boundary;
gfloat last_sync_level = wosc->last_sync_level;
gfloat last_freq_level = wosc->last_freq_level;
gfloat last_mod_level = wosc->last_mod_level;
GslWaveChunkBlock *block = &wosc->block;
gdouble *a = wosc->a, *b = wosc->b, *y = wosc->y;
gfloat *boundary = block->end;
guint wosc_j = wosc->j;
/* do the mixing */
wave_boundary = wave_out + n_values;
do
{
gfloat ffrac;
if (CHECK_SYNC)
{
gfloat sync_level = *sync_in++;
if_reject (GSL_SIGNAL_RAISING_EDGE (last_sync_level, sync_level))
{
wosc->j = wosc_j;
gsl_wave_osc_retrigger (wosc, CHECK_FREQ ? GSL_SIGNAL_TO_FREQ (*freq_in) : wosc->config.cfreq);
/* retrigger alters last_freq and last_mod */
last_freq_level = wosc->last_freq_level;
last_mod_level = wosc->last_mod_level;
wosc_j = wosc->j;
boundary = block->end;
/* FIXME: g_assert (ABS (block->dirstride) == 1); */
last_sync_level = sync_level;
}
}
if (CHECK_MOD && CHECK_FREQ)
{
gfloat mod_level = *mod_in++, freq_level = *freq_in++;
if_reject (GSL_SIGNAL_FREQ_CHANGED (last_freq_level, freq_level))
{
last_freq_level = freq_level;
if (GSL_SIGNAL_MOD_CHANGED (last_mod_level, mod_level))
last_mod_level = mod_level;
goto UPDATE_FREQ;
}
else if_reject (GSL_SIGNAL_MOD_CHANGED (last_mod_level, mod_level))
{
gfloat new_freq;
last_mod_level = mod_level;
UPDATE_FREQ:
new_freq = GSL_SIGNAL_TO_FREQ (freq_level);
if (EXPONENTIAL_FM)
new_freq *= gsl_signal_exp2 (wosc->config.fm_strength * mod_level);
else /* LINEAR_FM */
new_freq *= 1.0 + wosc->config.fm_strength * mod_level;
wave_osc_transform_filter (wosc, new_freq);
}
}
else if (CHECK_MOD)
{
gfloat mod_level = *mod_in++;
if (GSL_SIGNAL_MOD_CHANGED (last_mod_level, mod_level))
{
gfloat new_freq = wosc->config.cfreq;
if (EXPONENTIAL_FM)
new_freq *= gsl_signal_exp2 (wosc->config.fm_strength * mod_level);
else /* LINEAR_FM */
new_freq *= 1.0 + wosc->config.fm_strength * mod_level;
last_mod_level = mod_level;
wave_osc_transform_filter (wosc, new_freq);
}
}
else if (CHECK_FREQ)
{
gfloat freq_level = *freq_in++;
if (GSL_SIGNAL_FREQ_CHANGED (last_freq_level, freq_level))
{
last_freq_level = freq_level;
wave_osc_transform_filter (wosc, GSL_SIGNAL_TO_FREQ (freq_level));
}
}
/* process filter while necesary */
while (wosc->cur_pos >= (FRAC_MASK + 1) << 1)
{
gfloat c, c0, c1, c2, c3, c4, c5, c6, c7, c8;
gfloat d, d0, d1, d2, d3, d4, d5, d6, d7;
gfloat *x;
if_reject (wosc->x >= boundary) /* wchunk block boundary */
{
GslLong next_offset = block->next_offset;
gsl_wave_chunk_unuse_block (wosc->wchunk, block);
block->play_dir = wosc->config.play_dir;
block->offset = next_offset;
gsl_wave_chunk_use_block (wosc->wchunk, block);
wosc->x = block->start + wosc->config.channel;
boundary = block->end;
/* FIXME: g_assert (ABS (block->dirstride) == 1); */
}
if_expect (block->dirstride > 0)
{
x = wosc->x;
d0 = b[0] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d1 = b[1] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d2 = b[2] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d3 = b[3] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d4 = b[4] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d5 = b[5] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d6 = b[6] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d7 = b[7] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
c8 = a[8] * x[-4 * DIRSTRIDE (block)];
c6 = a[6] * x[-3 * DIRSTRIDE (block)];
c4 = a[4] * x[-2 * DIRSTRIDE (block)];
c2 = a[2] * x[-1 * DIRSTRIDE (block)];
c0 = a[0] * x[0 * DIRSTRIDE (block)];
d = d0 + d1 + d2 + d3 + d4 + d5 + d6 + d7;
c = c0 + c2 + c4 + c6 + c8;
y[wosc_j] = c - d; wosc_j++; wosc_j &= 0x7;
d0 = b[0] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d1 = b[1] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d2 = b[2] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d3 = b[3] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d4 = b[4] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d5 = b[5] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d6 = b[6] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d7 = b[7] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
c7 = a[7] * x[-3 * DIRSTRIDE (block)];
c5 = a[5] * x[-2 * DIRSTRIDE (block)];
c3 = a[3] * x[-1 * DIRSTRIDE (block)];
c1 = a[1] * x[0 * DIRSTRIDE (block)];
d = d0 + d1 + d2 + d3 + d4 + d5 + d6 + d7;
c = c1 + c3 + c5 + c7;
y[wosc_j] = c - d; wosc_j++; wosc_j &= 0x7;
wosc->x += DIRSTRIDE (block);
}
else /* dirstride < 0 */
{
x = wosc->x;
d0 = b[0] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d1 = b[1] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d2 = b[2] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d3 = b[3] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d4 = b[4] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d5 = b[5] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d6 = b[6] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d7 = b[7] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
c8 = a[8] * x[-4 * -DIRSTRIDE (block)];
c6 = a[6] * x[-3 * -DIRSTRIDE (block)];
c4 = a[4] * x[-2 * -DIRSTRIDE (block)];
c2 = a[2] * x[-1 * -DIRSTRIDE (block)];
c0 = a[0] * x[0 * -DIRSTRIDE (block)];
d = d0 + d1 + d2 + d3 + d4 + d5 + d6 + d7;
c = c0 + c2 + c4 + c6 + c8;
y[wosc_j] = c - d; wosc_j++; wosc_j &= 0x7;
d0 = b[0] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d1 = b[1] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d2 = b[2] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d3 = b[3] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d4 = b[4] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d5 = b[5] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d6 = b[6] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
d7 = b[7] * y[wosc_j]; wosc_j++; wosc_j &= 0x7;
c7 = a[7] * x[-3 * -DIRSTRIDE (block)];
c5 = a[5] * x[-2 * -DIRSTRIDE (block)];
c3 = a[3] * x[-1 * -DIRSTRIDE (block)];
c1 = a[1] * x[0 * -DIRSTRIDE (block)];
d = d0 + d1 + d2 + d3 + d4 + d5 + d6 + d7;
c = c1 + c3 + c5 + c7;
y[wosc_j] = c - d; wosc_j++; wosc_j &= 0x7;
wosc->x += -DIRSTRIDE (block);
}
wosc->cur_pos -= (FRAC_MASK + 1) << 1;
}
/* interpolate filter output from current pos
* wosc->cur_pos >> FRAC_SHIFT is 1 or 0;
*/
if (wosc->cur_pos >> FRAC_SHIFT)
{
guint k = wosc_j - 2;
ffrac = wosc->cur_pos & FRAC_MASK; /* int -> float */
ffrac *= 1. / (FRAC_MASK + 1.);
*wave_out++ = y[k & 0x7] * (1.0 - ffrac) + y[(k + 1) & 0x7] * ffrac;
}
else
{
guint k = wosc_j - 3;
ffrac = wosc->cur_pos; /* int -> float */
ffrac *= 1. / (FRAC_MASK + 1.);
*wave_out++ = y[k & 0x7] * (1.0 - ffrac) + y[(k + 1) & 0x7] * ffrac;
}
/* increment */
wosc->cur_pos += wosc->istep;
}
while (wave_out < wave_boundary);
wosc->j = wosc_j;
wosc->last_sync_level = last_sync_level;
wosc->last_freq_level = last_freq_level;
wosc->last_mod_level = last_mod_level;
}
#undef CHECK_SYNC
#undef CHECK_FREQ
#undef CHECK_MOD
#undef EXPONENTIAL_FM
#undef DIRSTRIDE
#undef WOSC_MIX_VARIANT
#undef WOSC_MIX_VARIANT_NAME
/* vim:set ts=8 sw=2 sts=2: */
|
