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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
27EXPORT_SYMBOL(snd_gf1_atten_table);
28
29unsigned 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
57#if 0
58
59unsigned 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
74unsigned int snd_gf1_calc_ramp_rate(struct snd_gus_card * gus,
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
112#endif
113
114unsigned short snd_gf1_translate_freq(struct snd_gus_card * gus, unsigned int freq16)
115{
116 freq16 >>= 3;
117 if (freq16 < 50)
118 freq16 = 50;
119 if (freq16 & 0xf8000000) {
120 freq16 = ~0xf8000000;
121 snd_printk(KERN_ERR "snd_gf1_translate_freq: overflow - freq = 0x%x\n", freq16);
122 }
123 return ((freq16 << 9) + (gus->gf1.playback_freq >> 1)) / gus->gf1.playback_freq;
124}
125
126#if 0
127
128short 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
144
145
146
147
148
149
150
151
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
160unsigned 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
191unsigned 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;
205 snd_printk(KERN_ERR "patch: (1) fc frequency overflow - %u\n", fc);
206 }
207 fc = (fc * 44100UL) / mix_rate;
208 while (scale--)
209 fc <<= 1;
210 if (fc > 65535L) {
211 fc = 65535;
212 snd_printk(KERN_ERR "patch: (2) fc frequency overflow - %u\n", fc);
213 }
214 return (unsigned short) fc;
215}
216
217#endif
218