1 /* 2 * Copyright (c) by Jaroslav Kysela <perex@perex.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 <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 57 #if 0 58 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 74 unsigned 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 /* 0 */ 113 114 unsigned 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 0 127 128 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; 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 /* 0 */ 218