1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 */
5
6 #include <linux/time.h>
7 #include <linux/export.h>
8 #include <sound/core.h>
9 #include <sound/gus.h>
10 #define __GUS_TABLES_ALLOC__
11 #include "gus_tables.h"
12
13 EXPORT_SYMBOL(snd_gf1_atten_table); /* for snd-gus-synth module */
14
snd_gf1_lvol_to_gvol_raw(unsigned int vol)15 unsigned short snd_gf1_lvol_to_gvol_raw(unsigned int vol)
16 {
17 unsigned short e, m, tmp;
18
19 if (vol > 65535)
20 vol = 65535;
21 tmp = vol;
22 e = 7;
23 if (tmp < 128) {
24 while (e > 0 && tmp < (1 << e))
25 e--;
26 } else {
27 while (tmp > 255) {
28 tmp >>= 1;
29 e++;
30 }
31 }
32 m = vol - (1 << e);
33 if (m > 0) {
34 if (e > 8)
35 m >>= e - 8;
36 else if (e < 8)
37 m <<= 8 - e;
38 m &= 255;
39 }
40 return (e << 8) | m;
41 }
42
43 #if 0
44
45 unsigned int snd_gf1_gvol_to_lvol_raw(unsigned short gf1_vol)
46 {
47 unsigned int rvol;
48 unsigned short e, m;
49
50 if (!gf1_vol)
51 return 0;
52 e = gf1_vol >> 8;
53 m = (unsigned char) gf1_vol;
54 rvol = 1 << e;
55 if (e > 8)
56 return rvol | (m << (e - 8));
57 return rvol | (m >> (8 - e));
58 }
59
60 unsigned int snd_gf1_calc_ramp_rate(struct snd_gus_card * gus,
61 unsigned short start,
62 unsigned short end,
63 unsigned int us)
64 {
65 static const unsigned char vol_rates[19] =
66 {
67 23, 24, 26, 28, 29, 31, 32, 34,
68 36, 37, 39, 40, 42, 44, 45, 47,
69 49, 50, 52
70 };
71 unsigned short range, increment, value, i;
72
73 start >>= 4;
74 end >>= 4;
75 if (start < end)
76 us /= end - start;
77 else
78 us /= start - end;
79 range = 4;
80 value = gus->gf1.enh_mode ?
81 vol_rates[0] :
82 vol_rates[gus->gf1.active_voices - 14];
83 for (i = 0; i < 3; i++) {
84 if (us < value) {
85 range = i;
86 break;
87 } else
88 value <<= 3;
89 }
90 if (range == 4) {
91 range = 3;
92 increment = 1;
93 } else
94 increment = (value + (value >> 1)) / us;
95 return (range << 6) | (increment & 0x3f);
96 }
97
98 #endif /* 0 */
99
snd_gf1_translate_freq(struct snd_gus_card * gus,unsigned int freq16)100 unsigned short snd_gf1_translate_freq(struct snd_gus_card * gus, unsigned int freq16)
101 {
102 freq16 >>= 3;
103 if (freq16 < 50)
104 freq16 = 50;
105 if (freq16 & 0xf8000000) {
106 freq16 = ~0xf8000000;
107 dev_err(gus->card->dev, "%s: overflow - freq = 0x%x\n",
108 __func__, freq16);
109 }
110 return ((freq16 << 9) + (gus->gf1.playback_freq >> 1)) / gus->gf1.playback_freq;
111 }
112
113 #if 0
114
115 short snd_gf1_compute_vibrato(short cents, unsigned short fc_register)
116 {
117 static const short vibrato_table[] =
118 {
119 0, 0, 32, 592, 61, 1175, 93, 1808,
120 124, 2433, 152, 3007, 182, 3632, 213, 4290,
121 241, 4834, 255, 5200
122 };
123
124 long depth;
125 const short *vi1, *vi2;
126 short pcents, v1;
127
128 pcents = cents < 0 ? -cents : cents;
129 for (vi1 = vibrato_table, vi2 = vi1 + 2; pcents > *vi2; vi1 = vi2, vi2 += 2);
130 v1 = *(vi1 + 1);
131 /* The FC table above is a list of pairs. The first number in the pair */
132 /* is the cents index from 0-255 cents, and the second number in the */
133 /* pair is the FC adjustment needed to change the pitch by the indexed */
134 /* number of cents. The table was created for an FC of 32768. */
135 /* The following expression does a linear interpolation against the */
136 /* approximated log curve in the table above, and then scales the number */
137 /* by the FC before the LFO. This calculation also adjusts the output */
138 /* value to produce the appropriate depth for the hardware. The depth */
139 /* is 2 * desired FC + 1. */
140 depth = (((int) (*(vi2 + 1) - *vi1) * (pcents - *vi1) / (*vi2 - *vi1)) + v1) * fc_register >> 14;
141 if (depth)
142 depth++;
143 if (depth > 255)
144 depth = 255;
145 return cents < 0 ? -(short) depth : (short) depth;
146 }
147
148 unsigned short snd_gf1_compute_pitchbend(unsigned short pitchbend, unsigned short sens)
149 {
150 static const long log_table[] = {1024, 1085, 1149, 1218, 1290, 1367, 1448, 1534, 1625, 1722, 1825, 1933};
151 int wheel, sensitivity;
152 unsigned int mantissa, f1, f2;
153 unsigned short semitones, f1_index, f2_index, f1_power, f2_power;
154 char bend_down = 0;
155 int bend;
156
157 if (!sens)
158 return 1024;
159 wheel = (int) pitchbend - 8192;
160 sensitivity = ((int) sens * wheel) / 128;
161 if (sensitivity < 0) {
162 bend_down = 1;
163 sensitivity = -sensitivity;
164 }
165 semitones = (unsigned int) (sensitivity >> 13);
166 mantissa = sensitivity % 8192;
167 f1_index = semitones % 12;
168 f2_index = (semitones + 1) % 12;
169 f1_power = semitones / 12;
170 f2_power = (semitones + 1) / 12;
171 f1 = log_table[f1_index] << f1_power;
172 f2 = log_table[f2_index] << f2_power;
173 bend = (int) ((((f2 - f1) * mantissa) >> 13) + f1);
174 if (bend_down)
175 bend = 1048576L / bend;
176 return bend;
177 }
178
179 unsigned short snd_gf1_compute_freq(unsigned int freq,
180 unsigned int rate,
181 unsigned short mix_rate)
182 {
183 unsigned int fc;
184 int scale = 0;
185
186 while (freq >= 4194304L) {
187 scale++;
188 freq >>= 1;
189 }
190 fc = (freq << 10) / rate;
191 if (fc > 97391L) {
192 fc = 97391;
193 pr_err("patch: (1) fc frequency overflow - %u\n", fc);
194 }
195 fc = (fc * 44100UL) / mix_rate;
196 while (scale--)
197 fc <<= 1;
198 if (fc > 65535L) {
199 fc = 65535;
200 pr_err("patch: (2) fc frequency overflow - %u\n", fc);
201 }
202 return (unsigned short) fc;
203 }
204
205 #endif /* 0 */
206