Current Path : /sys/amd64/compile/hs32/modules/usr/src/sys/modules/usb/uhci/@/tools/sound/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
Current File : //sys/amd64/compile/hs32/modules/usr/src/sys/modules/usb/uhci/@/tools/sound/snd_fxdiv_gen.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: release/9.1.0/sys/tools/sound/snd_fxdiv_gen.awk 193889 2009-06-10 06:49:45Z ariff $ # 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 = 18; 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 - 72 (more can be generated though..).\n"); printf(" *\n"); printf(" * 72 = SND_CHN_MAX * PCM_32_BPS, which is why....\n"); printf(" */\n\n"); printf("static const uint32_t snd_fxdiv_table[][2] = {\n"); 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\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"); }