1 /************************************************************************ 2 * Copyright (C) 2002-2009, Xiph.org Foundation 3 * Copyright (C) 2010, Robin Watts for Pinknoise Productions Ltd 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * * Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * * Redistributions in binary form must reproduce the above 13 * copyright notice, this list of conditions and the following disclaimer 14 * in the documentation and/or other materials provided with the 15 * distribution. 16 * * Neither the names of the Xiph.org Foundation nor Pinknoise 17 * Productions Ltd nor the names of its contributors may be used to 18 * endorse or promote products derived from this software without 19 * specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 ************************************************************************ 33 34 function: floor dB lookup 35 36 ************************************************************************/ 37 38 #include "os.h" 39 40 #ifdef _LOW_ACCURACY_ 41 # define XdB(n) ((((n)>>8)+1)>>1) 42 #else 43 # define XdB(n) (n) 44 #endif 45 46 const ogg_int32_t FLOOR_fromdB_LOOKUP[256]={ 47 XdB(0x000000e5), XdB(0x000000f4), XdB(0x00000103), XdB(0x00000114), 48 XdB(0x00000126), XdB(0x00000139), XdB(0x0000014e), XdB(0x00000163), 49 XdB(0x0000017a), XdB(0x00000193), XdB(0x000001ad), XdB(0x000001c9), 50 XdB(0x000001e7), XdB(0x00000206), XdB(0x00000228), XdB(0x0000024c), 51 XdB(0x00000272), XdB(0x0000029b), XdB(0x000002c6), XdB(0x000002f4), 52 XdB(0x00000326), XdB(0x0000035a), XdB(0x00000392), XdB(0x000003cd), 53 XdB(0x0000040c), XdB(0x00000450), XdB(0x00000497), XdB(0x000004e4), 54 XdB(0x00000535), XdB(0x0000058c), XdB(0x000005e8), XdB(0x0000064a), 55 XdB(0x000006b3), XdB(0x00000722), XdB(0x00000799), XdB(0x00000818), 56 XdB(0x0000089e), XdB(0x0000092e), XdB(0x000009c6), XdB(0x00000a69), 57 XdB(0x00000b16), XdB(0x00000bcf), XdB(0x00000c93), XdB(0x00000d64), 58 XdB(0x00000e43), XdB(0x00000f30), XdB(0x0000102d), XdB(0x0000113a), 59 XdB(0x00001258), XdB(0x0000138a), XdB(0x000014cf), XdB(0x00001629), 60 XdB(0x0000179a), XdB(0x00001922), XdB(0x00001ac4), XdB(0x00001c82), 61 XdB(0x00001e5c), XdB(0x00002055), XdB(0x0000226f), XdB(0x000024ac), 62 XdB(0x0000270e), XdB(0x00002997), XdB(0x00002c4b), XdB(0x00002f2c), 63 XdB(0x0000323d), XdB(0x00003581), XdB(0x000038fb), XdB(0x00003caf), 64 XdB(0x000040a0), XdB(0x000044d3), XdB(0x0000494c), XdB(0x00004e10), 65 XdB(0x00005323), XdB(0x0000588a), XdB(0x00005e4b), XdB(0x0000646b), 66 XdB(0x00006af2), XdB(0x000071e5), XdB(0x0000794c), XdB(0x0000812e), 67 XdB(0x00008993), XdB(0x00009283), XdB(0x00009c09), XdB(0x0000a62d), 68 XdB(0x0000b0f9), XdB(0x0000bc79), XdB(0x0000c8b9), XdB(0x0000d5c4), 69 XdB(0x0000e3a9), XdB(0x0000f274), XdB(0x00010235), XdB(0x000112fd), 70 XdB(0x000124dc), XdB(0x000137e4), XdB(0x00014c29), XdB(0x000161bf), 71 XdB(0x000178bc), XdB(0x00019137), XdB(0x0001ab4a), XdB(0x0001c70e), 72 XdB(0x0001e4a1), XdB(0x0002041f), XdB(0x000225aa), XdB(0x00024962), 73 XdB(0x00026f6d), XdB(0x000297f0), XdB(0x0002c316), XdB(0x0002f109), 74 XdB(0x000321f9), XdB(0x00035616), XdB(0x00038d97), XdB(0x0003c8b4), 75 XdB(0x000407a7), XdB(0x00044ab2), XdB(0x00049218), XdB(0x0004de23), 76 XdB(0x00052f1e), XdB(0x0005855c), XdB(0x0005e135), XdB(0x00064306), 77 XdB(0x0006ab33), XdB(0x00071a24), XdB(0x0007904b), XdB(0x00080e20), 78 XdB(0x00089422), XdB(0x000922da), XdB(0x0009bad8), XdB(0x000a5cb6), 79 XdB(0x000b091a), XdB(0x000bc0b1), XdB(0x000c8436), XdB(0x000d5471), 80 XdB(0x000e3233), XdB(0x000f1e5f), XdB(0x001019e4), XdB(0x001125c1), 81 XdB(0x00124306), XdB(0x001372d5), XdB(0x0014b663), XdB(0x00160ef7), 82 XdB(0x00177df0), XdB(0x001904c1), XdB(0x001aa4f9), XdB(0x001c603d), 83 XdB(0x001e384f), XdB(0x00202f0f), XdB(0x0022467a), XdB(0x002480b1), 84 XdB(0x0026dff7), XdB(0x002966b3), XdB(0x002c1776), XdB(0x002ef4fc), 85 XdB(0x0032022d), XdB(0x00354222), XdB(0x0038b828), XdB(0x003c67c2), 86 XdB(0x004054ae), XdB(0x004482e8), XdB(0x0048f6af), XdB(0x004db488), 87 XdB(0x0052c142), XdB(0x005821ff), XdB(0x005ddc33), XdB(0x0063f5b0), 88 XdB(0x006a74a7), XdB(0x00715faf), XdB(0x0078bdce), XdB(0x0080967f), 89 XdB(0x0088f1ba), XdB(0x0091d7f9), XdB(0x009b5247), XdB(0x00a56a41), 90 XdB(0x00b02a27), XdB(0x00bb9ce2), XdB(0x00c7ce12), XdB(0x00d4ca17), 91 XdB(0x00e29e20), XdB(0x00f15835), XdB(0x0101074b), XdB(0x0111bb4e), 92 XdB(0x01238531), XdB(0x01367704), XdB(0x014aa402), XdB(0x016020a7), 93 XdB(0x017702c3), XdB(0x018f6190), XdB(0x01a955cb), XdB(0x01c4f9cf), 94 XdB(0x01e269a8), XdB(0x0201c33b), XdB(0x0223265a), XdB(0x0246b4ea), 95 XdB(0x026c9302), XdB(0x0294e716), XdB(0x02bfda13), XdB(0x02ed9793), 96 XdB(0x031e4e09), XdB(0x03522ee4), XdB(0x03896ed0), XdB(0x03c445e2), 97 XdB(0x0402efd6), XdB(0x0445ac4b), XdB(0x048cbefc), XdB(0x04d87013), 98 XdB(0x05290c67), XdB(0x057ee5ca), XdB(0x05da5364), XdB(0x063bb204), 99 XdB(0x06a36485), XdB(0x0711d42b), XdB(0x0787710e), XdB(0x0804b299), 100 XdB(0x088a17ef), XdB(0x0918287e), XdB(0x09af747c), XdB(0x0a50957e), 101 XdB(0x0afc2f19), XdB(0x0bb2ef7f), XdB(0x0c759034), XdB(0x0d44d6ca), 102 XdB(0x0e2195bc), XdB(0x0f0cad0d), XdB(0x10070b62), XdB(0x1111aeea), 103 XdB(0x122da66c), XdB(0x135c120f), XdB(0x149e24d9), XdB(0x15f525b1), 104 XdB(0x176270e3), XdB(0x18e7794b), XdB(0x1a85c9ae), XdB(0x1c3f06d1), 105 XdB(0x1e14f07d), XdB(0x200963d7), XdB(0x221e5ccd), XdB(0x2455f870), 106 XdB(0x26b2770b), XdB(0x29363e2b), XdB(0x2be3db5c), XdB(0x2ebe06b6), 107 XdB(0x31c7a55b), XdB(0x3503ccd4), XdB(0x3875c5aa), XdB(0x3c210f44), 108 XdB(0x4009632b), XdB(0x4432b8cf), XdB(0x48a149bc), XdB(0x4d59959e), 109 XdB(0x52606733), XdB(0x57bad899), XdB(0x5d6e593a), XdB(0x6380b298), 110 XdB(0x69f80e9a), XdB(0x70dafda8), XdB(0x78307d76), XdB(0x7fffffff), 111 }; 112 113
