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15a1af95d6
Apply const prefix to each possible place: the static resource tables, the volume table, etc. Just for minor optimization and no functional changes. Link: https://lore.kernel.org/r/20200105144823.29547-50-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
205 lines
4.9 KiB
C
205 lines
4.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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*/
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#include <linux/time.h>
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#include <linux/export.h>
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#include <sound/core.h>
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#include <sound/gus.h>
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#define __GUS_TABLES_ALLOC__
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#include "gus_tables.h"
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EXPORT_SYMBOL(snd_gf1_atten_table); /* for snd-gus-synth module */
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unsigned short snd_gf1_lvol_to_gvol_raw(unsigned int vol)
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{
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unsigned short e, m, tmp;
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if (vol > 65535)
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vol = 65535;
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tmp = vol;
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e = 7;
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if (tmp < 128) {
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while (e > 0 && tmp < (1 << e))
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e--;
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} else {
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while (tmp > 255) {
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tmp >>= 1;
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e++;
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}
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}
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m = vol - (1 << e);
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if (m > 0) {
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if (e > 8)
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m >>= e - 8;
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else if (e < 8)
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m <<= 8 - e;
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m &= 255;
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}
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return (e << 8) | m;
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}
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#if 0
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unsigned int snd_gf1_gvol_to_lvol_raw(unsigned short gf1_vol)
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{
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unsigned int rvol;
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unsigned short e, m;
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if (!gf1_vol)
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return 0;
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e = gf1_vol >> 8;
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m = (unsigned char) gf1_vol;
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rvol = 1 << e;
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if (e > 8)
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return rvol | (m << (e - 8));
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return rvol | (m >> (8 - e));
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}
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unsigned int snd_gf1_calc_ramp_rate(struct snd_gus_card * gus,
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unsigned short start,
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unsigned short end,
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unsigned int us)
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{
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static const unsigned char vol_rates[19] =
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{
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23, 24, 26, 28, 29, 31, 32, 34,
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36, 37, 39, 40, 42, 44, 45, 47,
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49, 50, 52
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};
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unsigned short range, increment, value, i;
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start >>= 4;
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end >>= 4;
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if (start < end)
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us /= end - start;
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else
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us /= start - end;
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range = 4;
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value = gus->gf1.enh_mode ?
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vol_rates[0] :
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vol_rates[gus->gf1.active_voices - 14];
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for (i = 0; i < 3; i++) {
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if (us < value) {
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range = i;
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break;
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} else
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value <<= 3;
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}
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if (range == 4) {
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range = 3;
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increment = 1;
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} else
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increment = (value + (value >> 1)) / us;
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return (range << 6) | (increment & 0x3f);
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}
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#endif /* 0 */
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unsigned short snd_gf1_translate_freq(struct snd_gus_card * gus, unsigned int freq16)
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{
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freq16 >>= 3;
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if (freq16 < 50)
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freq16 = 50;
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if (freq16 & 0xf8000000) {
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freq16 = ~0xf8000000;
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snd_printk(KERN_ERR "snd_gf1_translate_freq: overflow - freq = 0x%x\n", freq16);
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}
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return ((freq16 << 9) + (gus->gf1.playback_freq >> 1)) / gus->gf1.playback_freq;
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}
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#if 0
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short snd_gf1_compute_vibrato(short cents, unsigned short fc_register)
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{
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static const short vibrato_table[] =
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{
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0, 0, 32, 592, 61, 1175, 93, 1808,
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124, 2433, 152, 3007, 182, 3632, 213, 4290,
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241, 4834, 255, 5200
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};
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long depth;
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const short *vi1, *vi2;
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short pcents, v1;
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pcents = cents < 0 ? -cents : cents;
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for (vi1 = vibrato_table, vi2 = vi1 + 2; pcents > *vi2; vi1 = vi2, vi2 += 2);
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v1 = *(vi1 + 1);
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/* The FC table above is a list of pairs. The first number in the pair */
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/* is the cents index from 0-255 cents, and the second number in the */
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/* pair is the FC adjustment needed to change the pitch by the indexed */
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/* number of cents. The table was created for an FC of 32768. */
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/* The following expression does a linear interpolation against the */
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/* approximated log curve in the table above, and then scales the number */
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/* by the FC before the LFO. This calculation also adjusts the output */
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/* value to produce the appropriate depth for the hardware. The depth */
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/* is 2 * desired FC + 1. */
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depth = (((int) (*(vi2 + 1) - *vi1) * (pcents - *vi1) / (*vi2 - *vi1)) + v1) * fc_register >> 14;
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if (depth)
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depth++;
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if (depth > 255)
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depth = 255;
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return cents < 0 ? -(short) depth : (short) depth;
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}
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unsigned short snd_gf1_compute_pitchbend(unsigned short pitchbend, unsigned short sens)
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{
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static const long log_table[] = {1024, 1085, 1149, 1218, 1290, 1367, 1448, 1534, 1625, 1722, 1825, 1933};
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int wheel, sensitivity;
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unsigned int mantissa, f1, f2;
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unsigned short semitones, f1_index, f2_index, f1_power, f2_power;
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char bend_down = 0;
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int bend;
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if (!sens)
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return 1024;
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wheel = (int) pitchbend - 8192;
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sensitivity = ((int) sens * wheel) / 128;
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if (sensitivity < 0) {
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bend_down = 1;
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sensitivity = -sensitivity;
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}
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semitones = (unsigned int) (sensitivity >> 13);
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mantissa = sensitivity % 8192;
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f1_index = semitones % 12;
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f2_index = (semitones + 1) % 12;
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f1_power = semitones / 12;
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f2_power = (semitones + 1) / 12;
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f1 = log_table[f1_index] << f1_power;
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f2 = log_table[f2_index] << f2_power;
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bend = (int) ((((f2 - f1) * mantissa) >> 13) + f1);
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if (bend_down)
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bend = 1048576L / bend;
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return bend;
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}
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unsigned short snd_gf1_compute_freq(unsigned int freq,
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unsigned int rate,
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unsigned short mix_rate)
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{
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unsigned int fc;
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int scale = 0;
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while (freq >= 4194304L) {
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scale++;
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freq >>= 1;
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}
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fc = (freq << 10) / rate;
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if (fc > 97391L) {
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fc = 97391;
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snd_printk(KERN_ERR "patch: (1) fc frequency overflow - %u\n", fc);
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}
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fc = (fc * 44100UL) / mix_rate;
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while (scale--)
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fc <<= 1;
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if (fc > 65535L) {
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fc = 65535;
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snd_printk(KERN_ERR "patch: (2) fc frequency overflow - %u\n", fc);
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}
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return (unsigned short) fc;
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}
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#endif /* 0 */
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