1 /* $NetBSD: auconv.h,v 1.5 2008/04/28 20:24:12 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 1997 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Lennart Augustsson. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/types.h> 33 #include <sys/audioio.h> 34 35 /* Convert between signed and unsigned. */ 36 static inline void change_sign8(u_char *, int); 37 static inline void change_sign16_le(u_char *, int); 38 static inline void change_sign16_be(u_char *, int); 39 static inline void change_sign32_le(u_char *, int); 40 static inline void change_sign32_be(u_char *, int); 41 /* Convert between little and big endian. */ 42 static inline void swap_bytes(u_char *, int); 43 static inline void swap_bytes32(u_char *, int); 44 static inline void swap_bytes_change_sign16_le(u_char *, int); 45 static inline void swap_bytes_change_sign16_be(u_char *, int); 46 static inline void change_sign16_swap_bytes_le(u_char *, int); 47 static inline void change_sign16_swap_bytes_be(u_char *, int); 48 static inline void swap_bytes_change_sign32_le(u_char *, int); 49 static inline void swap_bytes_change_sign32_be(u_char *, int); 50 static inline void change_sign32_swap_bytes_le(u_char *, int); 51 static inline void change_sign32_swap_bytes_be(u_char *, int); 52 53 static inline void 54 change_sign8(u_char *p, int cc) 55 { 56 while (--cc >= 0) { 57 *p ^= 0x80; 58 ++p; 59 } 60 } 61 62 static inline void 63 change_sign16_le(u_char *p, int cc) 64 { 65 while ((cc -= 2) >= 0) { 66 p[1] ^= 0x80; 67 p += 2; 68 } 69 } 70 71 static inline void 72 change_sign16_be(u_char *p, int cc) 73 { 74 while ((cc -= 2) >= 0) { 75 p[0] ^= 0x80; 76 p += 2; 77 } 78 } 79 80 static inline void 81 change_sign32_le(u_char *p, int cc) 82 { 83 while ((cc -= 4) >= 0) { 84 p[3] ^= 0x80; 85 p += 4; 86 } 87 } 88 89 static inline void 90 change_sign32_be(u_char *p, int cc) 91 { 92 while ((cc -= 4) >= 0) { 93 p[0] ^= 0x80; 94 p += 4; 95 } 96 } 97 98 static inline void 99 swap_bytes(u_char *p, int cc) 100 { 101 u_char t; 102 103 while ((cc -= 2) >= 0) { 104 t = p[0]; 105 p[0] = p[1]; 106 p[1] = t; 107 p += 2; 108 } 109 } 110 111 static inline void 112 swap_bytes32(u_char *p, int cc) 113 { 114 u_char t; 115 116 while ((cc -= 4) >= 0) { 117 t = p[0]; 118 p[0] = p[3]; 119 p[3] = t; 120 t = p[1]; 121 p[1] = p[2]; 122 p[2] = t; 123 p += 4; 124 } 125 } 126 127 static inline void 128 swap_bytes_change_sign16_le(u_char *p, int cc) 129 { 130 u_char t; 131 132 while ((cc -= 2) >= 0) { 133 t = p[1]; 134 p[1] = p[0] ^ 0x80; 135 p[0] = t; 136 p += 2; 137 } 138 } 139 140 static inline void 141 swap_bytes_change_sign16_be(u_char *p, int cc) 142 { 143 u_char t; 144 145 while ((cc -= 2) >= 0) { 146 t = p[0]; 147 p[0] = p[1] ^ 0x80; 148 p[1] = t; 149 p += 2; 150 } 151 } 152 153 static inline void 154 change_sign16_swap_bytes_le(u_char *p, int cc) 155 { 156 swap_bytes_change_sign16_be(p, cc); 157 } 158 159 static inline void 160 change_sign16_swap_bytes_be(u_char *p, int cc) 161 { 162 swap_bytes_change_sign16_le(p, cc); 163 } 164 165 static inline void 166 swap_bytes_change_sign32_le(u_char *p, int cc) 167 { 168 u_char t; 169 170 while ((cc -= 4) >= 0) { 171 t = p[3]; 172 p[3] = p[0] ^ 0x80; 173 p[0] = t; 174 t = p[1]; 175 p[1] = p[2]; 176 p[2] = t; 177 p += 4; 178 } 179 } 180 181 static inline void 182 swap_bytes_change_sign32_be(u_char *p, int cc) 183 { 184 u_char t; 185 186 while ((cc -= 4) >= 0) { 187 t = p[0]; 188 p[0] = p[3] ^ 0x80; 189 p[3] = t; 190 t = p[1]; 191 p[1] = p[2]; 192 p[2] = t; 193 p += 4; 194 } 195 } 196 197 static inline void 198 change_sign32_swap_bytes_le(u_char *p, int cc) 199 { 200 swap_bytes_change_sign32_be(p, cc); 201 } 202 203 static inline void 204 change_sign32_swap_bytes_be(u_char *p, int cc) 205 { 206 swap_bytes_change_sign32_le(p, cc); 207 } 208