Commit | Line | Data |
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1da177e4 | 1 | /* |
c1017a4c | 2 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
3 | * |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | * | |
19 | */ | |
20 | ||
1da177e4 LT |
21 | #include <linux/time.h> |
22 | #include <sound/core.h> | |
23 | #include <sound/gus.h> | |
24 | #define __GUS_TABLES_ALLOC__ | |
25 | #include "gus_tables.h" | |
26 | ||
27 | EXPORT_SYMBOL(snd_gf1_atten_table); /* for snd-gus-synth module */ | |
28 | ||
29 | unsigned short snd_gf1_lvol_to_gvol_raw(unsigned int vol) | |
30 | { | |
31 | unsigned short e, m, tmp; | |
32 | ||
33 | if (vol > 65535) | |
34 | vol = 65535; | |
35 | tmp = vol; | |
36 | e = 7; | |
37 | if (tmp < 128) { | |
38 | while (e > 0 && tmp < (1 << e)) | |
39 | e--; | |
40 | } else { | |
41 | while (tmp > 255) { | |
42 | tmp >>= 1; | |
43 | e++; | |
44 | } | |
45 | } | |
46 | m = vol - (1 << e); | |
47 | if (m > 0) { | |
48 | if (e > 8) | |
49 | m >>= e - 8; | |
50 | else if (e < 8) | |
51 | m <<= 8 - e; | |
52 | m &= 255; | |
53 | } | |
54 | return (e << 8) | m; | |
55 | } | |
56 | ||
209ac85d AB |
57 | #if 0 |
58 | ||
1da177e4 LT |
59 | unsigned int snd_gf1_gvol_to_lvol_raw(unsigned short gf1_vol) |
60 | { | |
61 | unsigned int rvol; | |
62 | unsigned short e, m; | |
63 | ||
64 | if (!gf1_vol) | |
65 | return 0; | |
66 | e = gf1_vol >> 8; | |
67 | m = (unsigned char) gf1_vol; | |
68 | rvol = 1 << e; | |
69 | if (e > 8) | |
70 | return rvol | (m << (e - 8)); | |
71 | return rvol | (m >> (8 - e)); | |
72 | } | |
73 | ||
5e2da206 | 74 | unsigned int snd_gf1_calc_ramp_rate(struct snd_gus_card * gus, |
1da177e4 LT |
75 | unsigned short start, |
76 | unsigned short end, | |
77 | unsigned int us) | |
78 | { | |
79 | static unsigned char vol_rates[19] = | |
80 | { | |
81 | 23, 24, 26, 28, 29, 31, 32, 34, | |
82 | 36, 37, 39, 40, 42, 44, 45, 47, | |
83 | 49, 50, 52 | |
84 | }; | |
85 | unsigned short range, increment, value, i; | |
86 | ||
87 | start >>= 4; | |
88 | end >>= 4; | |
89 | if (start < end) | |
90 | us /= end - start; | |
91 | else | |
92 | us /= start - end; | |
93 | range = 4; | |
94 | value = gus->gf1.enh_mode ? | |
95 | vol_rates[0] : | |
96 | vol_rates[gus->gf1.active_voices - 14]; | |
97 | for (i = 0; i < 3; i++) { | |
98 | if (us < value) { | |
99 | range = i; | |
100 | break; | |
101 | } else | |
102 | value <<= 3; | |
103 | } | |
104 | if (range == 4) { | |
105 | range = 3; | |
106 | increment = 1; | |
107 | } else | |
108 | increment = (value + (value >> 1)) / us; | |
109 | return (range << 6) | (increment & 0x3f); | |
110 | } | |
111 | ||
209ac85d AB |
112 | #endif /* 0 */ |
113 | ||
5e2da206 | 114 | unsigned short snd_gf1_translate_freq(struct snd_gus_card * gus, unsigned int freq16) |
1da177e4 LT |
115 | { |
116 | freq16 >>= 3; | |
117 | if (freq16 < 50) | |
118 | freq16 = 50; | |
119 | if (freq16 & 0xf8000000) { | |
120 | freq16 = ~0xf8000000; | |
99b359ba | 121 | snd_printk(KERN_ERR "snd_gf1_translate_freq: overflow - freq = 0x%x\n", freq16); |
1da177e4 LT |
122 | } |
123 | return ((freq16 << 9) + (gus->gf1.playback_freq >> 1)) / gus->gf1.playback_freq; | |
124 | } | |
125 | ||
209ac85d AB |
126 | #if 0 |
127 | ||
1da177e4 LT |
128 | short snd_gf1_compute_vibrato(short cents, unsigned short fc_register) |
129 | { | |
130 | static short vibrato_table[] = | |
131 | { | |
132 | 0, 0, 32, 592, 61, 1175, 93, 1808, | |
133 | 124, 2433, 152, 3007, 182, 3632, 213, 4290, | |
134 | 241, 4834, 255, 5200 | |
135 | }; | |
136 | ||
137 | long depth; | |
138 | short *vi1, *vi2, pcents, v1; | |
139 | ||
140 | pcents = cents < 0 ? -cents : cents; | |
141 | for (vi1 = vibrato_table, vi2 = vi1 + 2; pcents > *vi2; vi1 = vi2, vi2 += 2); | |
142 | v1 = *(vi1 + 1); | |
143 | /* The FC table above is a list of pairs. The first number in the pair */ | |
144 | /* is the cents index from 0-255 cents, and the second number in the */ | |
145 | /* pair is the FC adjustment needed to change the pitch by the indexed */ | |
146 | /* number of cents. The table was created for an FC of 32768. */ | |
147 | /* The following expression does a linear interpolation against the */ | |
148 | /* approximated log curve in the table above, and then scales the number */ | |
149 | /* by the FC before the LFO. This calculation also adjusts the output */ | |
150 | /* value to produce the appropriate depth for the hardware. The depth */ | |
151 | /* is 2 * desired FC + 1. */ | |
152 | depth = (((int) (*(vi2 + 1) - *vi1) * (pcents - *vi1) / (*vi2 - *vi1)) + v1) * fc_register >> 14; | |
153 | if (depth) | |
154 | depth++; | |
155 | if (depth > 255) | |
156 | depth = 255; | |
157 | return cents < 0 ? -(short) depth : (short) depth; | |
158 | } | |
159 | ||
160 | unsigned short snd_gf1_compute_pitchbend(unsigned short pitchbend, unsigned short sens) | |
161 | { | |
162 | static long log_table[] = {1024, 1085, 1149, 1218, 1290, 1367, 1448, 1534, 1625, 1722, 1825, 1933}; | |
163 | int wheel, sensitivity; | |
164 | unsigned int mantissa, f1, f2; | |
165 | unsigned short semitones, f1_index, f2_index, f1_power, f2_power; | |
166 | char bend_down = 0; | |
167 | int bend; | |
168 | ||
169 | if (!sens) | |
170 | return 1024; | |
171 | wheel = (int) pitchbend - 8192; | |
172 | sensitivity = ((int) sens * wheel) / 128; | |
173 | if (sensitivity < 0) { | |
174 | bend_down = 1; | |
175 | sensitivity = -sensitivity; | |
176 | } | |
177 | semitones = (unsigned int) (sensitivity >> 13); | |
178 | mantissa = sensitivity % 8192; | |
179 | f1_index = semitones % 12; | |
180 | f2_index = (semitones + 1) % 12; | |
181 | f1_power = semitones / 12; | |
182 | f2_power = (semitones + 1) / 12; | |
183 | f1 = log_table[f1_index] << f1_power; | |
184 | f2 = log_table[f2_index] << f2_power; | |
185 | bend = (int) ((((f2 - f1) * mantissa) >> 13) + f1); | |
186 | if (bend_down) | |
187 | bend = 1048576L / bend; | |
188 | return bend; | |
189 | } | |
190 | ||
191 | unsigned short snd_gf1_compute_freq(unsigned int freq, | |
192 | unsigned int rate, | |
193 | unsigned short mix_rate) | |
194 | { | |
195 | unsigned int fc; | |
196 | int scale = 0; | |
197 | ||
198 | while (freq >= 4194304L) { | |
199 | scale++; | |
200 | freq >>= 1; | |
201 | } | |
202 | fc = (freq << 10) / rate; | |
203 | if (fc > 97391L) { | |
204 | fc = 97391; | |
99b359ba | 205 | snd_printk(KERN_ERR "patch: (1) fc frequency overflow - %u\n", fc); |
1da177e4 LT |
206 | } |
207 | fc = (fc * 44100UL) / mix_rate; | |
208 | while (scale--) | |
209 | fc <<= 1; | |
210 | if (fc > 65535L) { | |
211 | fc = 65535; | |
99b359ba | 212 | snd_printk(KERN_ERR "patch: (2) fc frequency overflow - %u\n", fc); |
1da177e4 LT |
213 | } |
214 | return (unsigned short) fc; | |
215 | } | |
209ac85d AB |
216 | |
217 | #endif /* 0 */ |