146 lines
3.9 KiB
Awk
146 lines
3.9 KiB
Awk
#!/usr/bin/awk -f
|
|
#
|
|
# Copyright (c) 2008-2009 Ariff Abdullah <ariff@FreeBSD.org>
|
|
# All rights reserved.
|
|
#
|
|
# Redistribution and use in source and binary forms, with or without
|
|
# modification, are permitted provided that the following conditions
|
|
# are met:
|
|
# 1. Redistributions of source code must retain the above copyright
|
|
# notice, this list of conditions and the following disclaimer.
|
|
# 2. Redistributions in binary form must reproduce the above copyright
|
|
# notice, this list of conditions and the following disclaimer in the
|
|
# documentation and/or other materials provided with the distribution.
|
|
#
|
|
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
# SUCH DAMAGE.
|
|
#
|
|
# $FreeBSD$
|
|
#
|
|
|
|
function floor(x, r)
|
|
{
|
|
r = int(x);
|
|
if (r > x)
|
|
r--;
|
|
return (r + 0);
|
|
}
|
|
|
|
function shl(x, y)
|
|
{
|
|
while (y > 0) {
|
|
x *= 2;
|
|
y--;
|
|
}
|
|
return (x);
|
|
}
|
|
|
|
function shr(x, y)
|
|
{
|
|
while (y > 0 && x != 0) {
|
|
x = floor(x / 2);
|
|
y--;
|
|
}
|
|
return (x);
|
|
}
|
|
|
|
function calcdiv(r, x, y, z)
|
|
{
|
|
y = floor(FXONE / x);
|
|
z = FXSHIFT;
|
|
|
|
while (shr((y * x), z) < 1)
|
|
y++;
|
|
|
|
while ((y % 2) == 0 && z > 0) {
|
|
y = floor(y / 2);
|
|
z--;
|
|
}
|
|
|
|
r["mul"] = y;
|
|
r["shift"] = z;
|
|
}
|
|
|
|
BEGIN {
|
|
FXSHIFT = 16;
|
|
FXONE = shl(1, FXSHIFT);
|
|
|
|
SND_CHN_MAX = 127;
|
|
|
|
PCM_8_BPS = 1;
|
|
PCM_16_BPS = 2;
|
|
PCM_24_BPS = 3;
|
|
PCM_32_BPS = 4;
|
|
|
|
SND_MAX_ALIGN = SND_CHN_MAX * PCM_32_BPS;
|
|
|
|
for (i = 1; i <= SND_CHN_MAX; i++) {
|
|
aligns[PCM_8_BPS * i] = 1;
|
|
aligns[PCM_16_BPS * i] = 1;
|
|
aligns[PCM_24_BPS * i] = 1;
|
|
aligns[PCM_32_BPS * i] = 1;
|
|
}
|
|
|
|
printf("#ifndef _SND_FXDIV_GEN_H_\n");
|
|
printf("#define _SND_FXDIV_GEN_H_\n\n");
|
|
|
|
printf("/*\n");
|
|
printf(" * Generated using snd_fxdiv_gen.awk, heaven, wind and awesome.\n");
|
|
printf(" *\n");
|
|
printf(" * DO NOT EDIT!\n");
|
|
printf(" */\n\n");
|
|
printf("#ifdef SND_USE_FXDIV\n\n");
|
|
|
|
printf("/*\n");
|
|
printf(" * Fast unsigned 32bit integer division and rounding, accurate for\n");
|
|
printf(" * x = 1 - %d. This table should be enough to handle possible\n", FXONE);
|
|
printf(" * division for 1 - 508 (more can be generated though..).\n");
|
|
printf(" *\n");
|
|
printf(" * 508 = SND_CHN_MAX * PCM_32_BPS, which is why....\n");
|
|
printf(" */\n\n");
|
|
|
|
printf("extern const uint32_t snd_fxdiv_table[%d][2];\n\n", SND_MAX_ALIGN + 1);
|
|
|
|
printf("#ifdef SND_DECLARE_FXDIV\n");
|
|
printf("const uint32_t snd_fxdiv_table[%d][2] = {\n", SND_MAX_ALIGN + 1);
|
|
|
|
for (i = 1; i <= SND_MAX_ALIGN; i++) {
|
|
if (aligns[i] != 1)
|
|
continue;
|
|
calcdiv(r, i);
|
|
printf("\t[0x%02x] = { 0x%04x, 0x%02x },", \
|
|
i, r["mul"], r["shift"]);
|
|
printf("\t/* x / %-2d = (x * %-5d) >> %-2d */\n", \
|
|
i, r["mul"], r["shift"]);
|
|
}
|
|
|
|
printf("};\n#endif\n\n");
|
|
|
|
printf("#define SND_FXDIV_MAX\t\t0x%08x\n", FXONE);
|
|
printf("#define SND_FXDIV(x, y)\t\t(((uint32_t)(x) *\t\t\t\\\n");
|
|
printf("\t\t\t\t snd_fxdiv_table[y][0]) >>\t\t\\\n");
|
|
printf("\t\t\t\t snd_fxdiv_table[y][1])\n");
|
|
printf("#define SND_FXROUND(x, y)\t(SND_FXDIV(x, y) * (y))\n");
|
|
printf("#define SND_FXMOD(x, y)\t\t((x) - SND_FXROUND(x, y))\n\n");
|
|
|
|
printf("#else\t/* !SND_USE_FXDIV */\n\n");
|
|
|
|
printf("#define SND_FXDIV_MAX\t\t0x%08x\n", 131072);
|
|
printf("#define SND_FXDIV(x, y)\t\t((x) / (y))\n");
|
|
printf("#define SND_FXROUND(x, y)\t((x) - ((x) %% (y)))\n");
|
|
printf("#define SND_FXMOD(x, y)\t\t((x) %% (y))\n\n");
|
|
|
|
printf("#endif\t/* SND_USE_FXDIV */\n\n");
|
|
|
|
printf("#endif\t/* !_SND_FXDIV_GEN_H_ */\n");
|
|
}
|