1 // morse.cxx -- Morse code generation class
3 // Written by Curtis Olson, started March 2001.
5 // Copyright (C) 2001 Curtis L. Olson - http://www.flightgear.org/~curt
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
23 #include <simgear/constants.h>
29 static const char DI = '1';
30 static const char DIT = '1';
31 static const char DA = '2';
32 static const char DAH = '2';
33 static const char END = '0';
35 static const char alphabet[26][4] = {
36 { DI, DAH, END, END }, /* A */
37 { DA, DI, DI, DIT }, /* B */
38 { DA, DI, DA, DIT }, /* C */
39 { DA, DI, DIT, END }, /* D */
40 { DIT, END, END, END }, /* E */
41 { DI, DI, DA, DIT }, /* F */
42 { DA, DA, DIT, END }, /* G */
43 { DI, DI, DI, DIT }, /* H */
44 { DI, DIT, END, END }, /* I */
45 { DI, DA, DA, DAH }, /* J */
46 { DA, DI, DAH, END }, /* K */
47 { DI, DA, DI, DIT }, /* L */
48 { DA, DAH, END, END }, /* M */
49 { DA, DIT, END, END }, /* N */
50 { DA, DA, DAH, END }, /* O */
51 { DI, DA, DA, DIT }, /* P */
52 { DA, DA, DI, DAH }, /* Q */
53 { DI, DA, DIT, END }, /* R */
54 { DI, DI, DIT, END }, /* S */
55 { DAH, END, END, END }, /* T */
56 { DI, DI, DAH, END }, /* U */
57 { DI, DI, DI, DAH }, /* V */
58 { DI, DA, DAH, END }, /* W */
59 { DA, DI, DI, DAH }, /* X */
60 { DA, DI, DA, DAH }, /* Y */
61 { DA, DA, DI, DIT } /* Z */
64 static const char numerals[10][5] = {
65 { DA, DA, DA, DA, DAH }, // 0
66 { DI, DA, DA, DA, DAH }, // 1
67 { DI, DI, DA, DA, DAH }, // 2
68 { DI, DI, DI, DA, DAH }, // 3
69 { DI, DI, DI, DI, DAH }, // 4
70 { DI, DI, DI, DI, DIT }, // 5
71 { DA, DI, DI, DI, DIT }, // 6
72 { DA, DA, DI, DI, DIT }, // 7
73 { DA, DA, DA, DI, DIT }, // 8
74 { DA, DA, DA, DA, DIT } // 9
87 // allocate and initialize sound samples
88 bool FGMorse::init() {
90 make_tone( lo_dit, LO_FREQUENCY, DIT_SIZE - COUNT_SIZE, DIT_SIZE,
94 make_tone( hi_dit, HI_FREQUENCY, DIT_SIZE - COUNT_SIZE, DIT_SIZE,
98 make_tone( lo_dah, LO_FREQUENCY, DAH_SIZE - COUNT_SIZE, DAH_SIZE,
102 make_tone( hi_dah, HI_FREQUENCY, DAH_SIZE - COUNT_SIZE, DAH_SIZE,
107 for ( i = 0; i < SPACE_SIZE; ++i ) {
108 space[ i ] = (unsigned char) ( 0.5 * 255 ) ;
115 // allocate and initialize sound samples
116 bool FGMorse::cust_init(const int freq ) {
120 make_tone( cust_dit, freq, DIT_SIZE - COUNT_SIZE, DIT_SIZE,
124 make_tone( cust_dah, freq, DAH_SIZE - COUNT_SIZE, DAH_SIZE,
128 for ( i = 0; i < SPACE_SIZE; ++i ) {
129 space[ i ] = (unsigned char) ( 0.5 * 255 ) ;
136 // make a SGSoundSample morse code transmission for the specified string
137 SGSoundSample *FGMorse::make_ident( const string& id, const int freq ) {
139 char *idptr = (char *)id.c_str();
144 // 0. Select the frequency. If custom frequency, generate the
145 // sound fragments we need on the fly.
146 unsigned char *dit_ptr, *dah_ptr;
148 if ( freq == LO_FREQUENCY ) {
151 } else if ( freq == HI_FREQUENCY ) {
160 // 1. Determine byte length of message
161 for ( i = 0; i < (int)id.length(); ++i ) {
162 if ( idptr[i] >= 'A' && idptr[i] <= 'Z' ) {
163 int c = (int)(idptr[i] - 'A');
164 for ( j = 0; j < 4 && alphabet[c][j] != END; ++j ) {
165 if ( alphabet[c][j] == DIT ) {
167 } else if ( alphabet[c][j] == DAH ) {
171 length += SPACE_SIZE;
172 } else if ( idptr[i] >= '0' && idptr[i] <= '9' ) {
173 int c = (int)(idptr[i] - '0');
174 for ( j = 0; j < 5; ++j) {
175 if ( numerals[c][j] == DIT ) {
177 } else if ( numerals[c][j] == DAH ) {
181 length += SPACE_SIZE;
183 // skip unknown character
186 // add 2x more space to the end of the string
187 length += 2 * SPACE_SIZE;
189 // 2. Allocate space for the message
190 const unsigned char* buffer = (const unsigned char *)malloc(length);
192 // 3. Assemble the message;
193 unsigned char *buf_ptr = (unsigned char*)buffer;
195 for ( i = 0; i < (int)id.length(); ++i ) {
196 if ( idptr[i] >= 'A' && idptr[i] <= 'Z' ) {
197 int c = (int)(idptr[i] - 'A');
198 for ( j = 0; j < 4 && alphabet[c][j] != END; ++j ) {
199 if ( alphabet[c][j] == DIT ) {
200 memcpy( buf_ptr, dit_ptr, DIT_SIZE );
202 } else if ( alphabet[c][j] == DAH ) {
203 memcpy( buf_ptr, dah_ptr, DAH_SIZE );
207 memcpy( buf_ptr, space, SPACE_SIZE );
208 buf_ptr += SPACE_SIZE;
209 } else if ( idptr[i] >= '0' && idptr[i] <= '9' ) {
210 int c = (int)(idptr[i] - '0');
211 for ( j = 0; j < 5; ++j ) {
212 if ( numerals[c][j] == DIT ) {
213 memcpy( buf_ptr, dit_ptr, DIT_SIZE );
215 } else if ( numerals[c][j] == DAH ) {
216 memcpy( buf_ptr, dah_ptr, DAH_SIZE );
220 memcpy( buf_ptr, space, SPACE_SIZE );
221 buf_ptr += SPACE_SIZE;
223 // skip unknown character
226 memcpy( buf_ptr, space, SPACE_SIZE );
227 buf_ptr += SPACE_SIZE;
228 memcpy( buf_ptr, space, SPACE_SIZE );
229 buf_ptr += SPACE_SIZE;
231 // 4. create the simple sound and return
232 SGSoundSample *sample = new SGSoundSample( &buffer, length,
235 sample->set_reference_dist( 10.0 );
236 sample->set_max_dist( 20.0 );
241 FGMorse * FGMorse::_instance = NULL;
243 FGMorse * FGMorse::instance()
245 if( _instance == NULL ) {
246 _instance = new FGMorse();