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 snd_printk(KERN_ERR "snd_gf1_translate_freq: overflow - freq = 0x%x\n", freq16); 108 } 109 return ((freq16 << 9) + (gus->gf1.playback_freq >> 1)) / gus->gf1.playback_freq; 110 } 111 112 #if 0 113 114 short snd_gf1_compute_vibrato(short cents, unsigned short fc_register) 115 { 116 static const 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 const short *vi1, *vi2; 125 short pcents, v1; 126 127 pcents = cents < 0 ? -cents : cents; 128 for (vi1 = vibrato_table, vi2 = vi1 + 2; pcents > *vi2; vi1 = vi2, vi2 += 2); 129 v1 = *(vi1 + 1); 130 /* The FC table above is a list of pairs. The first number in the pair */ 131 /* is the cents index from 0-255 cents, and the second number in the */ 132 /* pair is the FC adjustment needed to change the pitch by the indexed */ 133 /* number of cents. The table was created for an FC of 32768. */ 134 /* The following expression does a linear interpolation against the */ 135 /* approximated log curve in the table above, and then scales the number */ 136 /* by the FC before the LFO. This calculation also adjusts the output */ 137 /* value to produce the appropriate depth for the hardware. The depth */ 138 /* is 2 * desired FC + 1. */ 139 depth = (((int) (*(vi2 + 1) - *vi1) * (pcents - *vi1) / (*vi2 - *vi1)) + v1) * fc_register >> 14; 140 if (depth) 141 depth++; 142 if (depth > 255) 143 depth = 255; 144 return cents < 0 ? -(short) depth : (short) depth; 145 } 146 147 unsigned short snd_gf1_compute_pitchbend(unsigned short pitchbend, unsigned short sens) 148 { 149 static const long log_table[] = {1024, 1085, 1149, 1218, 1290, 1367, 1448, 1534, 1625, 1722, 1825, 1933}; 150 int wheel, sensitivity; 151 unsigned int mantissa, f1, f2; 152 unsigned short semitones, f1_index, f2_index, f1_power, f2_power; 153 char bend_down = 0; 154 int bend; 155 156 if (!sens) 157 return 1024; 158 wheel = (int) pitchbend - 8192; 159 sensitivity = ((int) sens * wheel) / 128; 160 if (sensitivity < 0) { 161 bend_down = 1; 162 sensitivity = -sensitivity; 163 } 164 semitones = (unsigned int) (sensitivity >> 13); 165 mantissa = sensitivity % 8192; 166 f1_index = semitones % 12; 167 f2_index = (semitones + 1) % 12; 168 f1_power = semitones / 12; 169 f2_power = (semitones + 1) / 12; 170 f1 = log_table[f1_index] << f1_power; 171 f2 = log_table[f2_index] << f2_power; 172 bend = (int) ((((f2 - f1) * mantissa) >> 13) + f1); 173 if (bend_down) 174 bend = 1048576L / bend; 175 return bend; 176 } 177 178 unsigned short snd_gf1_compute_freq(unsigned int freq, 179 unsigned int rate, 180 unsigned short mix_rate) 181 { 182 unsigned int fc; 183 int scale = 0; 184 185 while (freq >= 4194304L) { 186 scale++; 187 freq >>= 1; 188 } 189 fc = (freq << 10) / rate; 190 if (fc > 97391L) { 191 fc = 97391; 192 snd_printk(KERN_ERR "patch: (1) fc frequency overflow - %u\n", fc); 193 } 194 fc = (fc * 44100UL) / mix_rate; 195 while (scale--) 196 fc <<= 1; 197 if (fc > 65535L) { 198 fc = 65535; 199 snd_printk(KERN_ERR "patch: (2) fc frequency overflow - %u\n", fc); 200 } 201 return (unsigned short) fc; 202 } 203 204 #endif /* 0 */ 205
