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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
c1017a4c | 3 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
4 | */ |
5 | ||
1da177e4 | 6 | #include <linux/time.h> |
d81a6d71 | 7 | #include <linux/export.h> |
1da177e4 LT |
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 | ||
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 | ||
209ac85d AB |
43 | #if 0 |
44 | ||
1da177e4 LT |
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 | ||
5e2da206 | 60 | unsigned int snd_gf1_calc_ramp_rate(struct snd_gus_card * gus, |
1da177e4 LT |
61 | unsigned short start, |
62 | unsigned short end, | |
63 | unsigned int us) | |
64 | { | |
65 | static 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 | ||
209ac85d AB |
98 | #endif /* 0 */ |
99 | ||
5e2da206 | 100 | unsigned short snd_gf1_translate_freq(struct snd_gus_card * gus, unsigned int freq16) |
1da177e4 LT |
101 | { |
102 | freq16 >>= 3; | |
103 | if (freq16 < 50) | |
104 | freq16 = 50; | |
105 | if (freq16 & 0xf8000000) { | |
106 | freq16 = ~0xf8000000; | |
99b359ba | 107 | snd_printk(KERN_ERR "snd_gf1_translate_freq: overflow - freq = 0x%x\n", freq16); |
1da177e4 LT |
108 | } |
109 | return ((freq16 << 9) + (gus->gf1.playback_freq >> 1)) / gus->gf1.playback_freq; | |
110 | } | |
111 | ||
209ac85d AB |
112 | #if 0 |
113 | ||
1da177e4 LT |
114 | short snd_gf1_compute_vibrato(short cents, unsigned short fc_register) |
115 | { | |
116 | static short vibrato_table[] = | |
117 | { | |
118 | 0, 0, 32, 592, 61, 1175, 93, 1808, | |
119 | 124, 2433, 152, 3007, 182, 3632, 213, 4290, | |
120 | 241, 4834, 255, 5200 | |
121 | }; | |
122 | ||
123 | long depth; | |
124 | short *vi1, *vi2, pcents, v1; | |
125 | ||
126 | pcents = cents < 0 ? -cents : cents; | |
127 | for (vi1 = vibrato_table, vi2 = vi1 + 2; pcents > *vi2; vi1 = vi2, vi2 += 2); | |
128 | v1 = *(vi1 + 1); | |
129 | /* The FC table above is a list of pairs. The first number in the pair */ | |
130 | /* is the cents index from 0-255 cents, and the second number in the */ | |
131 | /* pair is the FC adjustment needed to change the pitch by the indexed */ | |
132 | /* number of cents. The table was created for an FC of 32768. */ | |
133 | /* The following expression does a linear interpolation against the */ | |
134 | /* approximated log curve in the table above, and then scales the number */ | |
135 | /* by the FC before the LFO. This calculation also adjusts the output */ | |
136 | /* value to produce the appropriate depth for the hardware. The depth */ | |
137 | /* is 2 * desired FC + 1. */ | |
138 | depth = (((int) (*(vi2 + 1) - *vi1) * (pcents - *vi1) / (*vi2 - *vi1)) + v1) * fc_register >> 14; | |
139 | if (depth) | |
140 | depth++; | |
141 | if (depth > 255) | |
142 | depth = 255; | |
143 | return cents < 0 ? -(short) depth : (short) depth; | |
144 | } | |
145 | ||
146 | unsigned short snd_gf1_compute_pitchbend(unsigned short pitchbend, unsigned short sens) | |
147 | { | |
148 | static long log_table[] = {1024, 1085, 1149, 1218, 1290, 1367, 1448, 1534, 1625, 1722, 1825, 1933}; | |
149 | int wheel, sensitivity; | |
150 | unsigned int mantissa, f1, f2; | |
151 | unsigned short semitones, f1_index, f2_index, f1_power, f2_power; | |
152 | char bend_down = 0; | |
153 | int bend; | |
154 | ||
155 | if (!sens) | |
156 | return 1024; | |
157 | wheel = (int) pitchbend - 8192; | |
158 | sensitivity = ((int) sens * wheel) / 128; | |
159 | if (sensitivity < 0) { | |
160 | bend_down = 1; | |
161 | sensitivity = -sensitivity; | |
162 | } | |
163 | semitones = (unsigned int) (sensitivity >> 13); | |
164 | mantissa = sensitivity % 8192; | |
165 | f1_index = semitones % 12; | |
166 | f2_index = (semitones + 1) % 12; | |
167 | f1_power = semitones / 12; | |
168 | f2_power = (semitones + 1) / 12; | |
169 | f1 = log_table[f1_index] << f1_power; | |
170 | f2 = log_table[f2_index] << f2_power; | |
171 | bend = (int) ((((f2 - f1) * mantissa) >> 13) + f1); | |
172 | if (bend_down) | |
173 | bend = 1048576L / bend; | |
174 | return bend; | |
175 | } | |
176 | ||
177 | unsigned short snd_gf1_compute_freq(unsigned int freq, | |
178 | unsigned int rate, | |
179 | unsigned short mix_rate) | |
180 | { | |
181 | unsigned int fc; | |
182 | int scale = 0; | |
183 | ||
184 | while (freq >= 4194304L) { | |
185 | scale++; | |
186 | freq >>= 1; | |
187 | } | |
188 | fc = (freq << 10) / rate; | |
189 | if (fc > 97391L) { | |
190 | fc = 97391; | |
99b359ba | 191 | snd_printk(KERN_ERR "patch: (1) fc frequency overflow - %u\n", fc); |
1da177e4 LT |
192 | } |
193 | fc = (fc * 44100UL) / mix_rate; | |
194 | while (scale--) | |
195 | fc <<= 1; | |
196 | if (fc > 65535L) { | |
197 | fc = 65535; | |
99b359ba | 198 | snd_printk(KERN_ERR "patch: (2) fc frequency overflow - %u\n", fc); |
1da177e4 LT |
199 | } |
200 | return (unsigned short) fc; | |
201 | } | |
209ac85d AB |
202 | |
203 | #endif /* 0 */ |