308 lines
8.8 KiB
C
308 lines
8.8 KiB
C
/*
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* Copyright (c) 1999 Hellmuth Michaelis. 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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*
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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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* ---
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*
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* The A-law to u-law and u-law to A-law conversion routines and tables
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* were taken from the G.711 reference implementation from Sun and freely
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* available as http://www.itu.int/itudoc/itu-t/rec/g/g700-799/refimpl.txt.
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*
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* Therefore for that part of the code, the following restrictions apply:
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*
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*
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* This source code is a product of Sun Microsystems, Inc. and is provided
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* for unrestricted use. Users may copy or modify this source code without
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* charge.
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*
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* SUN SOURCE CODE IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING
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* THE WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun source code is provided with no support and without any obligation on
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* the part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY THIS SOFTWARE
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*
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* ---
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*
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* The bitreverse table was contributed by Stefan Bethke.
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*
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*---------------------------------------------------------------------------
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*
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* A-law / u-law conversions as specified in G.711
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* -----------------------------------------------
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*
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* last edit-date: [Mon Dec 13 21:44:01 1999]
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*
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* $Id: g711conv.c,v 1.5 1999/12/13 21:25:24 hm Exp $
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*
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* $FreeBSD$
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*
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*---------------------------------------------------------------------------*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <i4b/i4b_ioctl.h>
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/* copy from CCITT G.711 specifications */
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/* u- to A-law conversions */
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unsigned char _u2a[128] = {
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1, 1, 2, 2, 3, 3, 4, 4,
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5, 5, 6, 6, 7, 7, 8, 8,
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9, 10, 11, 12, 13, 14, 15, 16,
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17, 18, 19, 20, 21, 22, 23, 24,
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25, 27, 29, 31, 33, 34, 35, 36,
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37, 38, 39, 40, 41, 42, 43, 44,
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46, 48, 49, 50, 51, 52, 53, 54,
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55, 56, 57, 58, 59, 60, 61, 62,
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64, 65, 66, 67, 68, 69, 70, 71,
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72, 73, 74, 75, 76, 77, 78, 79,
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81, 82, 83, 84, 85, 86, 87, 88,
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89, 90, 91, 92, 93, 94, 95, 96,
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97, 98, 99, 100, 101, 102, 103, 104,
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105, 106, 107, 108, 109, 110, 111, 112,
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113, 114, 115, 116, 117, 118, 119, 120,
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121, 122, 123, 124, 125, 126, 127, 128
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};
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/* A- to u-law conversions */
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unsigned char _a2u[128] = {
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1, 3, 5, 7, 9, 11, 13, 15,
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16, 17, 18, 19, 20, 21, 22, 23,
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24, 25, 26, 27, 28, 29, 30, 31,
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32, 32, 33, 33, 34, 34, 35, 35,
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36, 37, 38, 39, 40, 41, 42, 43,
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44, 45, 46, 47, 48, 48, 49, 49,
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50, 51, 52, 53, 54, 55, 56, 57,
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58, 59, 60, 61, 62, 63, 64, 64,
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65, 66, 67, 68, 69, 70, 71, 72,
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73, 74, 75, 76, 77, 78, 79, 79,
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80, 81, 82, 83, 84, 85, 86, 87,
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88, 89, 90, 91, 92, 93, 94, 95,
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96, 97, 98, 99, 100, 101, 102, 103,
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104, 105, 106, 107, 108, 109, 110, 111,
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112, 113, 114, 115, 116, 117, 118, 119,
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120, 121, 122, 123, 124, 125, 126, 127
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};
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/* reverse bits (7->0, 6->1, 5->2 etc) for tx to / rx from ISDN */
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unsigned char bitreverse[256] = {
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0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
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0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
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0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4, 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
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0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
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0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2, 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
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0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea, 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
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0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
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0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee, 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
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0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1, 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
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0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
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0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5, 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
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0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed, 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
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0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
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0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb, 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
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0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7, 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
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0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
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};
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/* A-law to u-law conversion */
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unsigned char alaw2ulaw(unsigned char aval)
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{
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aval &= 0xff;
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return ((aval & 0x80) ? (0xFF ^ _a2u[aval ^ 0xD5]) :
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(0x7F ^ _a2u[aval ^ 0x55]));
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}
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/* u-law to A-law conversion */
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unsigned char ulaw2alaw(unsigned char uval)
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{
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uval &= 0xff;
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return ((uval & 0x80) ? (0xD5 ^ (_u2a[0xFF ^ uval] - 1)) :
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(0x55 ^ (_u2a[0x7F ^ uval] - 1)));
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}
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void
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usage(void)
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{
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fprintf(stderr, "\n");
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fprintf(stderr, "g711conv - do conversions according to ITU G.711, (version %d.%d.%d)\n",VERSION, REL, STEP);
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fprintf(stderr, "usage: g711conv -a -r -R -u -P\n");
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fprintf(stderr, " -a A-law to u-law conversion\n");
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fprintf(stderr, " -r reverse bits before conversion\n");
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fprintf(stderr, " -R reverse bits after conversion\n");
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fprintf(stderr, " -u u-law to A-law conversion\n");
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fprintf(stderr, " -P print conversion table as C source\n");
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fprintf(stderr, "\n");
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exit(1);
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}
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int
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main(int argc, char **argv)
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{
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int i;
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int c;
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int opt_a = 0;
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int opt_u = 0;
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int opt_r = 0;
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int opt_P = 0;
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int opt_R = 0;
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unsigned char uc;
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while ((c = getopt(argc, argv, "aurPR")) != -1)
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{
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switch(c)
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{
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case 'a':
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opt_a = 1;
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break;
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case 'u':
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opt_u = 1;
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break;
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case 'r':
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opt_r = 1;
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break;
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case 'R':
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opt_R = 1;
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break;
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case 'P':
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opt_P = 1;
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break;
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case '?':
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default:
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usage();
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break;
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}
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}
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if((opt_a + opt_u) > 1)
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usage();
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if(opt_P)
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{
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printf("\n/* ");
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if((opt_a + opt_u) == 0)
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printf("No Conversion");
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if(opt_a)
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printf("A-law to u-law conversion");
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if(opt_u)
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printf("u-law to A-law conversion");
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if(opt_r)
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printf(", reverse bits BEFORE conversion");
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if(opt_R)
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printf(", reverse bits AFTER conversion");
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if(opt_a)
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{
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printf(" */\n\nunsigned char a2u_tab[256] = {");
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}
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else if(opt_u)
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{
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printf(" */\n\nunsigned char u2a_tab[256] = {");
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}
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else
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{
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printf(" */\n\nunsigned char table[256] = {");
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}
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for(i=0; i < 256; i++)
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{
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uc = i;
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if(!(i % 8))
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printf("\n/* %02x */\t", i);
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if(opt_r)
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uc = bitreverse[uc];
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if(opt_u)
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uc = ulaw2alaw(uc);
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if(opt_a)
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uc = alaw2ulaw(uc);
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if(opt_R)
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uc = bitreverse[uc];
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if(i == 255)
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printf("0x%02x", uc);
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else
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printf("0x%02x, ", uc);
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}
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printf("\n};\n");
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}
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else
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{
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unsigned char ib[1];
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while(fread(ib, 1, 1, stdin) == 1)
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{
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if(opt_r)
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ib[0] = bitreverse[ib[0]];
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if(opt_u)
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ib[0] = ulaw2alaw(ib[0]);
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if(opt_a)
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ib[0] = alaw2ulaw(ib[0]);
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if(opt_R)
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ib[0] = bitreverse[ib[0]];
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fwrite(ib, 1, 1, stdout);
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}
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}
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return(0);
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}
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/* EOF */
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