1 /* 2 * Copyright (c) by Jaroslav Kysela <perex@suse.cz> 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 21 #include <sound/driver.h> 22 #include <linux/time.h> 23 #include <sound/core.h> 24 #include <sound/gus.h> 25 #define __GUS_TABLES_ALLOC__ 26 #include "gus_tables.h" 27 28 EXPORT_SYMBOL(snd_gf1_atten_table); /* for snd-gus-synth module */ 29 30 unsigned short snd_gf1_lvol_to_gvol_raw(unsigned int vol) 31 { 32 unsigned short e, m, tmp; 33 34 if (vol > 65535) 35 vol = 65535; 36 tmp = vol; 37 e = 7; 38 if (tmp < 128) { 39 while (e > 0 && tmp < (1 << e)) 40 e--; 41 } else { 42 while (tmp > 255) { 43 tmp >>= 1; 44 e++; 45 } 46 } 47 m = vol - (1 << e); 48 if (m > 0) { 49 if (e > 8) 50 m >>= e - 8; 51 else if (e < 8) 52 m <<= 8 - e; 53 m &= 255; 54 } 55 return (e << 8) | m; 56 } 57 58 unsigned int snd_gf1_gvol_to_lvol_raw(unsigned short gf1_vol) 59 { 60 unsigned int rvol; 61 unsigned short e, m; 62 63 if (!gf1_vol) 64 return 0; 65 e = gf1_vol >> 8; 66 m = (unsigned char) gf1_vol; 67 rvol = 1 << e; 68 if (e > 8) 69 return rvol | (m << (e - 8)); 70 return rvol | (m >> (8 - e)); 71 } 72 73 unsigned int snd_gf1_calc_ramp_rate(snd_gus_card_t * gus, 74 unsigned short start, 75 unsigned short end, 76 unsigned int us) 77 { 78 static unsigned char vol_rates[19] = 79 { 80 23, 24, 26, 28, 29, 31, 32, 34, 81 36, 37, 39, 40, 42, 44, 45, 47, 82 49, 50, 52 83 }; 84 unsigned short range, increment, value, i; 85 86 start >>= 4; 87 end >>= 4; 88 if (start < end) 89 us /= end - start; 90 else 91 us /= start - end; 92 range = 4; 93 value = gus->gf1.enh_mode ? 94 vol_rates[0] : 95 vol_rates[gus->gf1.active_voices - 14]; 96 for (i = 0; i < 3; i++) { 97 if (us < value) { 98 range = i; 99 break; 100 } else 101 value <<= 3; 102 } 103 if (range == 4) { 104 range = 3; 105 increment = 1; 106 } else 107 increment = (value + (value >> 1)) / us; 108 return (range << 6) | (increment & 0x3f); 109 } 110 111 unsigned short snd_gf1_translate_freq(snd_gus_card_t * gus, unsigned int freq16) 112 { 113 freq16 >>= 3; 114 if (freq16 < 50) 115 freq16 = 50; 116 if (freq16 & 0xf8000000) { 117 freq16 = ~0xf8000000; 118 snd_printk("snd_gf1_translate_freq: overflow - freq = 0x%x\n", freq16); 119 } 120 return ((freq16 << 9) + (gus->gf1.playback_freq >> 1)) / gus->gf1.playback_freq; 121 } 122 123 short snd_gf1_compute_vibrato(short cents, unsigned short fc_register) 124 { 125 static short vibrato_table[] = 126 { 127 0, 0, 32, 592, 61, 1175, 93, 1808, 128 124, 2433, 152, 3007, 182, 3632, 213, 4290, 129 241, 4834, 255, 5200 130 }; 131 132 long depth; 133 short *vi1, *vi2, pcents, v1; 134 135 pcents = cents < 0 ? -cents : cents; 136 for (vi1 = vibrato_table, vi2 = vi1 + 2; pcents > *vi2; vi1 = vi2, vi2 += 2); 137 v1 = *(vi1 + 1); 138 /* The FC table above is a list of pairs. The first number in the pair */ 139 /* is the cents index from 0-255 cents, and the second number in the */ 140 /* pair is the FC adjustment needed to change the pitch by the indexed */ 141 /* number of cents. The table was created for an FC of 32768. */ 142 /* The following expression does a linear interpolation against the */ 143 /* approximated log curve in the table above, and then scales the number */ 144 /* by the FC before the LFO. This calculation also adjusts the output */ 145 /* value to produce the appropriate depth for the hardware. The depth */ 146 /* is 2 * desired FC + 1. */ 147 depth = (((int) (*(vi2 + 1) - *vi1) * (pcents - *vi1) / (*vi2 - *vi1)) + v1) * fc_register >> 14; 148 if (depth) 149 depth++; 150 if (depth > 255) 151 depth = 255; 152 return cents < 0 ? -(short) depth : (short) depth; 153 } 154 155 unsigned short snd_gf1_compute_pitchbend(unsigned short pitchbend, unsigned short sens) 156 { 157 static long log_table[] = {1024, 1085, 1149, 1218, 1290, 1367, 1448, 1534, 1625, 1722, 1825, 1933}; 158 int wheel, sensitivity; 159 unsigned int mantissa, f1, f2; 160 unsigned short semitones, f1_index, f2_index, f1_power, f2_power; 161 char bend_down = 0; 162 int bend; 163 164 if (!sens) 165 return 1024; 166 wheel = (int) pitchbend - 8192; 167 sensitivity = ((int) sens * wheel) / 128; 168 if (sensitivity < 0) { 169 bend_down = 1; 170 sensitivity = -sensitivity; 171 } 172 semitones = (unsigned int) (sensitivity >> 13); 173 mantissa = sensitivity % 8192; 174 f1_index = semitones % 12; 175 f2_index = (semitones + 1) % 12; 176 f1_power = semitones / 12; 177 f2_power = (semitones + 1) / 12; 178 f1 = log_table[f1_index] << f1_power; 179 f2 = log_table[f2_index] << f2_power; 180 bend = (int) ((((f2 - f1) * mantissa) >> 13) + f1); 181 if (bend_down) 182 bend = 1048576L / bend; 183 return bend; 184 } 185 186 unsigned short snd_gf1_compute_freq(unsigned int freq, 187 unsigned int rate, 188 unsigned short mix_rate) 189 { 190 unsigned int fc; 191 int scale = 0; 192 193 while (freq >= 4194304L) { 194 scale++; 195 freq >>= 1; 196 } 197 fc = (freq << 10) / rate; 198 if (fc > 97391L) { 199 fc = 97391; 200 snd_printk("patch: (1) fc frequency overflow - %u\n", fc); 201 } 202 fc = (fc * 44100UL) / mix_rate; 203 while (scale--) 204 fc <<= 1; 205 if (fc > 65535L) { 206 fc = 65535; 207 snd_printk("patch: (2) fc frequency overflow - %u\n", fc); 208 } 209 return (unsigned short) fc; 210 } 211