/* * Copyright (c) 1999 Hellmuth Michaelis. 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. * * --- * * The A-law to u-law and u-law to A-law conversion routines and tables * were taken from the G.711 reference implementation from Sun and freely * available as http://www.itu.int/itudoc/itu-t/rec/g/g700-799/refimpl.txt. * * Therefore for that part of the code, the following restrictions apply: * * * This source code is a product of Sun Microsystems, Inc. and is provided * for unrestricted use. Users may copy or modify this source code without * charge. * * SUN SOURCE CODE IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING * THE WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. * * Sun source code is provided with no support and without any obligation on * the part of Sun Microsystems, Inc. to assist in its use, correction, * modification or enhancement. * * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY THIS SOFTWARE * OR ANY PART THEREOF. * * In no event will Sun Microsystems, Inc. be liable for any lost revenue * or profits or other special, indirect and consequential damages, even if * Sun has been advised of the possibility of such damages. * * Sun Microsystems, Inc. * 2550 Garcia Avenue * Mountain View, California 94043 * * --- * * The bitreverse table was contributed by Stefan Bethke. * *--------------------------------------------------------------------------- * * A-law / u-law conversions as specified in G.711 * ----------------------------------------------- * * last edit-date: [Mon Dec 13 21:44:01 1999] * * $Id: g711conv.c,v 1.5 1999/12/13 21:25:24 hm Exp $ * * $FreeBSD: src/usr.sbin/i4b/g711conv/g711conv.c,v 1.4.2.1 2001/08/01 17:45:02 obrien Exp $ * $DragonFly: src/usr.sbin/i4b/g711conv/g711conv.c,v 1.6 2007/11/25 01:28:24 swildner Exp $ * *---------------------------------------------------------------------------*/ #include #include #include #include /* copy from CCITT G.711 specifications */ /* u- to A-law conversions */ unsigned char _u2a[128] = { 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 29, 31, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 46, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128 }; /* A- to u-law conversions */ unsigned char _a2u[128] = { 1, 3, 5, 7, 9, 11, 13, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 32, 33, 33, 34, 34, 35, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 48, 49, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127 }; /* reverse bits (7->0, 6->1, 5->2 etc) for tx to / rx from ISDN */ unsigned char bitreverse[256] = { 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0, 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8, 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4, 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4, 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc, 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2, 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2, 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea, 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa, 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6, 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee, 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe, 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1, 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1, 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9, 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5, 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5, 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed, 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd, 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3, 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb, 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb, 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7, 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7, 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff }; /* A-law to u-law conversion */ unsigned char alaw2ulaw(unsigned char aval) { aval &= 0xff; return ((aval & 0x80) ? (0xFF ^ _a2u[aval ^ 0xD5]) : (0x7F ^ _a2u[aval ^ 0x55])); } /* u-law to A-law conversion */ unsigned char ulaw2alaw(unsigned char uval) { uval &= 0xff; return ((uval & 0x80) ? (0xD5 ^ (_u2a[0xFF ^ uval] - 1)) : (0x55 ^ (_u2a[0x7F ^ uval] - 1))); } void usage(void) { fprintf(stderr, "\n"); fprintf(stderr, "g711conv - do conversions according to ITU G.711, (version %d.%d.%d)\n",VERSION, REL, STEP); fprintf(stderr, "usage: g711conv -a -r -R -u -P\n"); fprintf(stderr, " -a A-law to u-law conversion\n"); fprintf(stderr, " -r reverse bits before conversion\n"); fprintf(stderr, " -R reverse bits after conversion\n"); fprintf(stderr, " -u u-law to A-law conversion\n"); fprintf(stderr, " -P print conversion table as C source\n"); fprintf(stderr, "\n"); exit(1); } int main(int argc, char **argv) { int i; int c; int opt_a = 0; int opt_u = 0; int opt_r = 0; int opt_P = 0; int opt_R = 0; unsigned char uc; while ((c = getopt(argc, argv, "aurPR")) != -1) { switch(c) { case 'a': opt_a = 1; break; case 'u': opt_u = 1; break; case 'r': opt_r = 1; break; case 'R': opt_R = 1; break; case 'P': opt_P = 1; break; default: usage(); break; } } if((opt_a + opt_u) > 1) usage(); if(opt_P) { printf("\n/* "); if((opt_a + opt_u) == 0) printf("No Conversion"); if(opt_a) printf("A-law to u-law conversion"); if(opt_u) printf("u-law to A-law conversion"); if(opt_r) printf(", reverse bits BEFORE conversion"); if(opt_R) printf(", reverse bits AFTER conversion"); if(opt_a) { printf(" */\n\nunsigned char a2u_tab[256] = {"); } else if(opt_u) { printf(" */\n\nunsigned char u2a_tab[256] = {"); } else { printf(" */\n\nunsigned char table[256] = {"); } for(i=0; i < 256; i++) { uc = i; if(!(i % 8)) printf("\n/* %02x */\t", i); if(opt_r) uc = bitreverse[uc]; if(opt_u) uc = ulaw2alaw(uc); if(opt_a) uc = alaw2ulaw(uc); if(opt_R) uc = bitreverse[uc]; if(i == 255) printf("0x%02x", uc); else printf("0x%02x, ", uc); } printf("\n};\n"); } else { unsigned char ib[1]; while(fread(ib, 1, 1, stdin) == 1) { if(opt_r) ib[0] = bitreverse[ib[0]]; if(opt_u) ib[0] = ulaw2alaw(ib[0]); if(opt_a) ib[0] = alaw2ulaw(ib[0]); if(opt_R) ib[0] = bitreverse[ib[0]]; fwrite(ib, 1, 1, stdout); } } return(0); } /* EOF */