kernel-ark/sound/isa/gus/gus_volume.c
Paul Gortmaker d81a6d7176 sound: Add export.h for THIS_MODULE/EXPORT_SYMBOL where needed
These aren't modules, but they do make use of these macros, so
they will need export.h to get that definition.  Previously,
they got it via the implicit module.h inclusion.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-10-31 19:31:22 -04:00

219 lines
5.5 KiB
C

/*
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/time.h>
#include <linux/export.h>
#include <sound/core.h>
#include <sound/gus.h>
#define __GUS_TABLES_ALLOC__
#include "gus_tables.h"
EXPORT_SYMBOL(snd_gf1_atten_table); /* for snd-gus-synth module */
unsigned short snd_gf1_lvol_to_gvol_raw(unsigned int vol)
{
unsigned short e, m, tmp;
if (vol > 65535)
vol = 65535;
tmp = vol;
e = 7;
if (tmp < 128) {
while (e > 0 && tmp < (1 << e))
e--;
} else {
while (tmp > 255) {
tmp >>= 1;
e++;
}
}
m = vol - (1 << e);
if (m > 0) {
if (e > 8)
m >>= e - 8;
else if (e < 8)
m <<= 8 - e;
m &= 255;
}
return (e << 8) | m;
}
#if 0
unsigned int snd_gf1_gvol_to_lvol_raw(unsigned short gf1_vol)
{
unsigned int rvol;
unsigned short e, m;
if (!gf1_vol)
return 0;
e = gf1_vol >> 8;
m = (unsigned char) gf1_vol;
rvol = 1 << e;
if (e > 8)
return rvol | (m << (e - 8));
return rvol | (m >> (8 - e));
}
unsigned int snd_gf1_calc_ramp_rate(struct snd_gus_card * gus,
unsigned short start,
unsigned short end,
unsigned int us)
{
static unsigned char vol_rates[19] =
{
23, 24, 26, 28, 29, 31, 32, 34,
36, 37, 39, 40, 42, 44, 45, 47,
49, 50, 52
};
unsigned short range, increment, value, i;
start >>= 4;
end >>= 4;
if (start < end)
us /= end - start;
else
us /= start - end;
range = 4;
value = gus->gf1.enh_mode ?
vol_rates[0] :
vol_rates[gus->gf1.active_voices - 14];
for (i = 0; i < 3; i++) {
if (us < value) {
range = i;
break;
} else
value <<= 3;
}
if (range == 4) {
range = 3;
increment = 1;
} else
increment = (value + (value >> 1)) / us;
return (range << 6) | (increment & 0x3f);
}
#endif /* 0 */
unsigned short snd_gf1_translate_freq(struct snd_gus_card * gus, unsigned int freq16)
{
freq16 >>= 3;
if (freq16 < 50)
freq16 = 50;
if (freq16 & 0xf8000000) {
freq16 = ~0xf8000000;
snd_printk(KERN_ERR "snd_gf1_translate_freq: overflow - freq = 0x%x\n", freq16);
}
return ((freq16 << 9) + (gus->gf1.playback_freq >> 1)) / gus->gf1.playback_freq;
}
#if 0
short snd_gf1_compute_vibrato(short cents, unsigned short fc_register)
{
static short vibrato_table[] =
{
0, 0, 32, 592, 61, 1175, 93, 1808,
124, 2433, 152, 3007, 182, 3632, 213, 4290,
241, 4834, 255, 5200
};
long depth;
short *vi1, *vi2, pcents, v1;
pcents = cents < 0 ? -cents : cents;
for (vi1 = vibrato_table, vi2 = vi1 + 2; pcents > *vi2; vi1 = vi2, vi2 += 2);
v1 = *(vi1 + 1);
/* The FC table above is a list of pairs. The first number in the pair */
/* is the cents index from 0-255 cents, and the second number in the */
/* pair is the FC adjustment needed to change the pitch by the indexed */
/* number of cents. The table was created for an FC of 32768. */
/* The following expression does a linear interpolation against the */
/* approximated log curve in the table above, and then scales the number */
/* by the FC before the LFO. This calculation also adjusts the output */
/* value to produce the appropriate depth for the hardware. The depth */
/* is 2 * desired FC + 1. */
depth = (((int) (*(vi2 + 1) - *vi1) * (pcents - *vi1) / (*vi2 - *vi1)) + v1) * fc_register >> 14;
if (depth)
depth++;
if (depth > 255)
depth = 255;
return cents < 0 ? -(short) depth : (short) depth;
}
unsigned short snd_gf1_compute_pitchbend(unsigned short pitchbend, unsigned short sens)
{
static long log_table[] = {1024, 1085, 1149, 1218, 1290, 1367, 1448, 1534, 1625, 1722, 1825, 1933};
int wheel, sensitivity;
unsigned int mantissa, f1, f2;
unsigned short semitones, f1_index, f2_index, f1_power, f2_power;
char bend_down = 0;
int bend;
if (!sens)
return 1024;
wheel = (int) pitchbend - 8192;
sensitivity = ((int) sens * wheel) / 128;
if (sensitivity < 0) {
bend_down = 1;
sensitivity = -sensitivity;
}
semitones = (unsigned int) (sensitivity >> 13);
mantissa = sensitivity % 8192;
f1_index = semitones % 12;
f2_index = (semitones + 1) % 12;
f1_power = semitones / 12;
f2_power = (semitones + 1) / 12;
f1 = log_table[f1_index] << f1_power;
f2 = log_table[f2_index] << f2_power;
bend = (int) ((((f2 - f1) * mantissa) >> 13) + f1);
if (bend_down)
bend = 1048576L / bend;
return bend;
}
unsigned short snd_gf1_compute_freq(unsigned int freq,
unsigned int rate,
unsigned short mix_rate)
{
unsigned int fc;
int scale = 0;
while (freq >= 4194304L) {
scale++;
freq >>= 1;
}
fc = (freq << 10) / rate;
if (fc > 97391L) {
fc = 97391;
snd_printk(KERN_ERR "patch: (1) fc frequency overflow - %u\n", fc);
}
fc = (fc * 44100UL) / mix_rate;
while (scale--)
fc <<= 1;
if (fc > 65535L) {
fc = 65535;
snd_printk(KERN_ERR "patch: (2) fc frequency overflow - %u\n", fc);
}
return (unsigned short) fc;
}
#endif /* 0 */