143 lines
3.8 KiB
Awk
143 lines
3.8 KiB
Awk
#!/usr/bin/awk -f
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#
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# Copyright (c) 2008-2009 Ariff Abdullah <ariff@FreeBSD.org>
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $FreeBSD$
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#
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function floor(x, r)
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{
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r = int(x);
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if (r > x)
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r--;
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return (r + 0);
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}
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function shl(x, y)
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{
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while (y > 0) {
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x *= 2;
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y--;
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}
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return (x);
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}
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function shr(x, y)
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{
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while (y > 0 && x != 0) {
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x = floor(x / 2);
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y--;
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}
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return (x);
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}
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function calcdiv(r, x, y, z)
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{
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y = floor(FXONE / x);
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z = FXSHIFT;
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while (shr((y * x), z) < 1)
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y++;
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while ((y % 2) == 0 && z > 0) {
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y = floor(y / 2);
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z--;
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}
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r["mul"] = y;
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r["shift"] = z;
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}
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BEGIN {
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FXSHIFT = 16;
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FXONE = shl(1, FXSHIFT);
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SND_CHN_MAX = 18;
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PCM_8_BPS = 1;
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PCM_16_BPS = 2;
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PCM_24_BPS = 3;
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PCM_32_BPS = 4;
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SND_MAX_ALIGN = SND_CHN_MAX * PCM_32_BPS;
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for (i = 1; i <= SND_CHN_MAX; i++) {
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aligns[PCM_8_BPS * i] = 1;
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aligns[PCM_16_BPS * i] = 1;
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aligns[PCM_24_BPS * i] = 1;
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aligns[PCM_32_BPS * i] = 1;
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}
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printf("#ifndef _SND_FXDIV_GEN_H_\n");
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printf("#define _SND_FXDIV_GEN_H_\n\n");
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printf("/*\n");
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printf(" * Generated using snd_fxdiv_gen.awk, heaven, wind and awesome.\n");
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printf(" *\n");
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printf(" * DO NOT EDIT!\n");
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printf(" */\n\n");
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printf("#ifdef SND_USE_FXDIV\n\n");
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printf("/*\n");
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printf(" * Fast unsigned 32bit integer division and rounding, accurate for\n");
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printf(" * x = 1 - %d. This table should be enough to handle possible\n", FXONE);
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printf(" * division for 1 - 72 (more can be generated though..).\n");
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printf(" *\n");
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printf(" * 72 = SND_CHN_MAX * PCM_32_BPS, which is why....\n");
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printf(" */\n\n");
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printf("static const uint32_t snd_fxdiv_table[][2] = {\n");
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for (i = 1; i <= SND_MAX_ALIGN; i++) {
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if (aligns[i] != 1)
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continue;
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calcdiv(r, i);
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printf("\t[0x%02x] = { 0x%04x, 0x%02x },", \
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i, r["mul"], r["shift"]);
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printf("\t/* x / %-2d = (x * %-5d) >> %-2d */\n", \
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i, r["mul"], r["shift"]);
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}
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printf("};\n\n");
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printf("#define SND_FXDIV_MAX\t\t0x%08x\n", FXONE);
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printf("#define SND_FXDIV(x, y)\t\t(((uint32_t)(x) *\t\t\t\\\n");
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printf("\t\t\t\t snd_fxdiv_table[y][0]) >>\t\t\\\n");
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printf("\t\t\t\t snd_fxdiv_table[y][1])\n");
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printf("#define SND_FXROUND(x, y)\t(SND_FXDIV(x, y) * (y))\n");
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printf("#define SND_FXMOD(x, y)\t\t((x) - SND_FXROUND(x, y))\n\n");
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printf("#else\t/* !SND_USE_FXDIV */\n\n");
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printf("#define SND_FXDIV_MAX\t\t0x%08x\n", 131072);
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printf("#define SND_FXDIV(x, y)\t\t((x) / (y))\n");
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printf("#define SND_FXROUND(x, y)\t((x) - ((x) %% (y)))\n");
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printf("#define SND_FXMOD(x, y)\t\t((x) %% (y))\n\n");
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printf("#endif\t/* SND_USE_FXDIV */\n\n");
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printf("#endif\t/* !_SND_FXDIV_GEN_H_ */\n");
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}
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